Product description SGT to SGT screw jack Both trapezoidal and ball screw versions ALBERT-SGT-screw jacks are electromechanical transmission components suitable for a wide spectrum of industrial machinery. A range of sizes, coupled with a modular approach to nut and installation arrangements, satisfy customer design requirements. The range has a logical progression of load capability between and kn. Higher loads are possible and spindles up to m long can be provided. Normal stroke speeds up to.m/s: For higher speeds please enquire. Logically designed combinations of standard components, with good interchangeability, make simple installation possible whilst permitting operation in any chosen position and attitude with minimum space requirement. ALBERT-SGT-screw jacks can be provided with electrical, hydraulic, pneumatic and manual inputs. Precise relative motion is provided for screw jacks used in combination but with unequal loads. Rest positions are maintained by the self locking trapezoidal spindle or by the use of a brake motor. Environmental temperatures between - C and + C are possible. High operational safety is ensured by the choice of compatible materials and simple installation and maintenance. For more extreme mechanical or chemical conditions, ALBERT- SGT-screw jacks are manufactured with suitable special materials. The enclosed construction, including comprehensive spindle protection, allows utilisation in hostile conditions. Standard options include Safety Nuts, Ball Screw Spindles (for high utilisation or lifting speeds), spindle rotation prevention and backlash compensation. Special spindle diameters and leads can also be supplied. Application examples: Production Equipment, Assembly and Repair, Storage and Mechanical Handling, Paper, Food, Rolling Mills and Foundries, Mining and Metal manufacturers, Building, Water and Ship Building (exposed deck equipment), Research and Development, New Technologies, Theatre and Stage Engineering. The wide range of available accessories ensures the closest possible match to customer requirements. If you have questions or problems our Technical and Sales personnel will be very pleased to hear from you. We are always happy to offer our experience and provide assistance with the design of drives and equipment. 9.
Contents list SGT screw jacks - basic design and running nut design Versions basic design GO, GU running nut design LO, LU Page - Dimensions SGT to SGT GO, GU dimensions for SGT, SGT and SGT dimensions for SGT to SGT, SGT 7 and SGT standard spindle ends for versions GO, GU initial selection table Page - Dimensions SGT to SGT LO, LU dimensions for SGT, SGT and SGT dimensions for SGT to SGT, SGT 7 and SGT standard spindle ends for versions LO, LU initial selection table Page - 7 7 Trapezoidal spindle standard dimensions Page - 9 i Input power and torque SGT to SGT input power P in. [kw] permitted input torque to worm shaft M in. [Nm] Page - i Installation worm shaft mounting orientation worm shaft orientation Page i Suggested drive arrangements - mechanically synchronised examples Page - Installation examples/ dimensioning of screw jack systems SGT to SGT selection path Page - i Definition of the applied loads, torques and speeds/ calculations input speed n in. [/min], input power P in. [kw] per screw jack, input power P [kw] for total system, actual lifting speed V [m/min] machine lift act. Page - 7.
Contents list SGT screw jacks - basic design and running nut design i Calculations Maximum radial load F r max. [N], duty ED [%/h], input torque M in. [Nm] at the worm shaft, selection of the motor, torque M [Nm] in the lifting spindle Sp. Page - 9 i Calculations total input torque M tot. [Nm], spindle efficiency spindle [-], surface stress in thread p [N/mm²], life L [h] ball screw spindle/ ball bearing h Page - i Calculations critical spindle speed n crit. [/min] (only running nut design) Page i Calculations Permissible side loading F [kn] on the spindle due to compressive loads S Page - i Calculations critical buckling loads F crit. [kn] on the spindle Page - 7 i Gear housing material/ installation and maintenance instructions gear housing material selection table installation, maintenance Page - 9............... Questionnaire/ accessories for quotation purposes accessories for basic design GO accessories for basic design GU Page -............... Accessories accessories for running nut design LO accessories for running nut design LU Page - xx i Application examples reference customer Hermes PM welding fixture with screw jack system SGT screw jack SGT Page 9.
Versions Basic design GO, GU G configuration (basic design) has two versions: GO ( basic design, spindle above) and GU (basic design, spindle below). In both cases the spindle moves to transmit the linear lifting motion. The spindle is axially guided through the screw jack gear housing. Any tendency of the spindle to rotate must be resisted. Basic design Basic design GO Basic design GU Trapezoidal spindle Ball screw spindle Version GO Version GU.
Versions Running nut design LO, LU L configuration (running nut) has two versions: LO ( running nut, spindle above) and LU (running nut, spindle below). The axial movement of the nut transmits the linear lifting motion due to spindle rotation. In this configuration the spindle is axially fixed in the gear housing. Running nut design Running nut design LO Running nut design LU Trapezoidal spindle Ball screw spindle Version LO Version LU 9.
Dimensions for SGT, SGT and SGT Versions GO, GU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions GO: Basic design, spindle above GU: Basic design, spindle below Basic design GO Ratio: Lubrication: grease N: normal, L: slow Material: see table page Accessories: see catalogue accessories for SGT screw jacks Questionnaire: see page Basic design GU Ø d Ø d Ø d Standard spindle end, see page Ø d Z = L + stroke L L stroke L 9 H stroke + L Ø d H stroke + L L 7 H H with single guidance collar Ø d stroke + L Z = stroke + L H L 9 stroke L L Ø d with two guidance collars Standard spindle end, see page Screw jack size SGT H H H H 9 H Ø H W Ø W H Ø d Screw jack sizes SGT and SGT H H Ø H H H H W H 9 H Ø W W W W W W W H H 7.
Dimensions [mm] Order code d d d H H H H H H H 7 H H 9 H H H H L L L L L L SGT SGT SGT 7 9 97 7 9 7 9 9-7 - - - 9 7 -,, 7, 7 7-7 7 9 7 7 Dimensions [mm] Order code L 7 L L 9 W W W W SGT SGT SGT k, k, k, 9 Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply.. 7
Dimensions for SGT to SGT, SGT 7 and SGT Versions GO, GU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions GO: Basic design, spindle above GU: Basic design, spindle below Basic design GO Basic design GU Ø d Ø d Ø d Standard spindle end, see page Ø d Z = L + stroke L L stroke L 9 H Z = L + stroke Ø d H stroke + L H Standard spindle end, see page Screw jack sizes SGT 7 and SGT H H H H Ø H H with single guidance collar stroke + L Z = L + stroke H L 9 stroke L L with two guidance collars Ø d Screw jack sizes SGT to SGT H H H Ø H H L 7 H H Ø d H 9 W Ø W H Ø d H H 9 Ø W W H 7 H W W W W W W H H 7.
Dimensions [mm] Order code d d d H H H H H H H 7 H H 9 H H H H L L L L L L SGT SGT SGT SGT SGT SGT SGT 7 SGT 9 9 7 7 7 9 9 7, 7 7 7 9 9 97 7 9 - - - - - -, 7,,, 7, 97, 9 9 7 9 7 7 7 - - 9 9 7 9 9 79 7 9 7 7 97 7 Dimensions [mm] Order code L 7 L L 9 W W W W SGT SGT SGT SGT SGT SGT SGT 7 SGT 7 k 9, j k, k, k, k 7 7 k k Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply.. 9
Dimensions for SGT to SGT Standard spindle ends for versions GO, GU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions GO: Basic design, spindle above GU: Basic design, spindle below Ratio: Lubrication: grease N: normal, L: slow Material: see table page Accessories: see catalogue accessories for SGT screw jacks Questionnaire: see page Selection of the standard spindle ends: Ø d Ø d Ø d Ø d Ø d 7 H7 d GO d Ø d h7 L 7 L L L L L L 9 L L Z = L + stroke L GU Z=L + stroke L L Ordering example: Screw jack Size Basic design Spindle above Spindle end standard version Ratio N (normal) Worm shaft double ended (see page ) Mounting orientation (see page ) Worm shaft orientation (see page ) SGT GO - - N - - III/ - S Special version 7.
Dimensions [mm] Order code d d d d d d d 7 d L L L L L L L 7 L L 9 L L SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT M Mx, Mx, Mx Mx Mx M7x Mx Mx Mx Mx 7 7 7 7 9 9 9 7 97 7 7 7 7 7 7 7 9 7 7 79 7 7 9 9 7 97 7 7 7 9 7 9 7 7 7 7 7 97 7 7 9 7 7 Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply. Initial selection table Static lifting force ) Ratio Ratio N (normal) Lift per worm shaft rotation Overall efficiency Ratio Ratio L (slow) Lift per worm shaft rotation Overall efficiency Input power (S-%) max. spindle torque ) max permissible torque at worm shaft ) Spindle Spindle efficiency Lubricant quantity Mass without spindle Mass of spindle per m Order code SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT F max. [kn] 7 i N,,,, [mm/ rev.],,7,,,,,,,7 tot. i [mm/ tot. P in. M sp. M in. Tr x P spindle [-] L rev.] [-] [kw] [Nm] [Nm] [mm] [-],,,,,,,9,,,,,,,,9,,,,,,,,,,,,,,,,9,,,,,,,,9, 7, 9,,7 9 7 7 999 7 9 7 99 9 9 9 7 7 7 7 x x x x7 x x 9x x x x x,,,,7,,,7,,,7,9 [kg],,,,,,7,,,,, m [kg], 7 9 m [kg/m],7,,, 7,9,,,7 7,7,7, ) The values for max. load apply only for initial jack selection. The actual permitted lifting force depends on the version of the jack and the operating conditions. ) max. torque the spindle can transmit ) important when screw jacks are in series e.g. where several units are constrained to operate together at same or differing speeds The values in the above table relate only to Albert-SGT-screw jacks in standard configuration (grease lubrication, spindle diameter, spindle lead ) and in standard materials. Units may be specified with oil lubrication. This provides higher efficiency and may allow selection of a smaller screw jack. The provision of comprehensive application data is essential to ensure the correct selection..
Dimensions for SGT, SGT and SGT Versions LO, LU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions LO: Running nut design, spindle above LU: Running nut design, spindle below Ratio: Lubrication: grease N: normal, L: slow Material: see table page Accessories: see catalogue accessories for SGT screw jacks Questionnaire: see page Running nut design LO Running nut design LU Standard spindle end, see page Ø d Z = L + stroke + L L L stroke L L H Ø d Ø d L= length of the running nut; see catalogue accessories for SGT screw jacks H L H Z = L + stroke + L L L Screw jack size SGT H H H 9 H H W Ø W Ø H L L stroke Ø d H H L H L= length of the running nut; see catalogue accessories for SGT screw jacks Standard spindle end, see page Screw jack sizes SGT and SGT H H H H W H 9 H Ø H H W W Ø W W W W W H H 7.
Order code Dimensions [mm] d d d H H H H H H H 7 H H 9 H H H H L L L L L L SGT SGT SGT 7 7 7 9 - - 9 7 - - 9 9 7 -,, 7, 77 9-97 9-7 7 7 9 9 Dimensions [mm] Order code W W W W SGT SGT SGT k k k,,, 9 Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply..
Dimensions for SGT to SGT, SGT 7 and SGT Versions LO, LU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions LO: Running nut design, spindle above LU: Running nut design, spindle below Running nut design LO Running nut design LU Standard spindle end, see page Ø d Z = L + stroke + L L L stroke L L Ø d H Ø d L= length of the running nut; see catalogue accessories for SGT screw jacks H L H Z = L + stroke + L L L L L stroke Ø d H H L H L= length of the running nut; see catalogue accessories for SGT screw jacks Standard spindle end, see page Screw jack sizes SGT to SGT Screw jack sizes SGT 7 and SGT H H H H H Ø H H H H H H 9 Ø H W Ø W H H H 9 Ø W W H 7 H W W W W W W H H 7.
Order code Dimensions [mm] d d d H H H H H H H 7 H H 9 H H H H L L L L L L SGT SGT SGT SGT SGT SGT SGT 7 SGT 9 9 -, 7 9-9, - 7, - 7 9 -,, 9 7 97-7, 9-9 9-97 9 7 7-7 - 7 7-7 7, 7 7 9 7 9 9 7 7 Dimensions [mm] Order code W W W W SGT k 9, SGT j SGT k, SGT k, SGT k, SGT k 7 7 SGT 7 k SGT k Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply..
Dimensions for SGT to SGT Standard spindle ends for versions LO, LU All versions are supplied with double worm shafts (version ) as standard. Optionally these can be supplied only on the left (version ) or the right (version ). Versions LO: Running nut design, spindle above LU: Running nut design, spindle below Ratio: Lubrication: grease N: normal, L: slow Material: see table page Accessories: see catalogue accessories for SGT screw jacks Questionnaire: see page Selection of the standard spindle ends: d Ø d h7 LO L LU L L L L Z = L + stroke + L Z = L + stroke + L Ordering example: Screw jack Size Running nut design Spindle above Spindle end standard version Ratio N (normal) Worm shaft double ended (see page ) Mounting orientation (see page ) Worm shaft orientation (see page ) SGT LO - - N - - III/ - S Special version 7.
Dimensions [mm] Order code d d L L L L SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT M Mx, Mx, Mx Mx Mx M7x Mx Mx Mx Mx 7 7 7 77 7 7 7 9 9 9 7 7 9 9 7 Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium, apply to machined surfaces. For all other dimensions casting tolerances apply. Initial selection table Static lifting force ) Ratio Ratio N (normal) Lift per worm shaft rotation Overall efficiency Ratio Ratio L (slow) Lift per worm shaft rotation Overall efficiency Input power (S-%) max. spindle torque ) max permissible torque at worm shaft ) Spindle Spindle efficiency Lubricant quantity Mass without spindle Mass of spindle per m Order code SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT F max. [kn] 7 i N,,,, [mm/ rev.],,7,,,,,,,7 tot. [-],,,,,,,9,,,, i L [mm/ rev.],,,,9,,,,,,, tot. [-],,,,,,,,,9,, P in. [kw],,,,,,9, 7, 9,,7 M sp. [Nm] 9 7 7 999 7 9 7 99 M in. [Nm] 9 9 9 7 7 7 7 Tr x P [mm] x x x x7 x x 9x x x x x spindle [-],,,,7,,,7,,,7,9 [kg],,,,,,7,,,,, m [kg], 7 9 m [kg/m],7,,, 7,9,,,7 7,7,7, ) The values for max. load apply only for initial jack selection. The actual permitted lifting force depends on the version of the jack and the operating conditions. ) max. torque the spindle can transmit ) important when screw jacks are in series e.g. where several units are constrained to operate together at same or differing speeds The values in the above table relate only to Albert-SGT-screw jacks in standard configuration (grease lubrication, spindle diameter, spindle lead ) and in standard materials. Units may be specified with oil lubrication. This provides higher efficiency and may allow selection of a smaller screw jack. The provision of comprehensive application data is essential to ensure the correct selection.. 7
Trapezoidal spindles for SGT to SGT Standard dimensions The trapezoidal spindles for Albert-screw jacks are accurately manufactured. The metric trapezoidal spindles are manufactured to DIN. Standard spindles are manufactured from heat treatable steel, drawn or peeled, h. The lead tolerance is ±, mm per mm length for a single start right hand thread. Multi-start and left handed threads are available. Please enquire. Thread quality: 7e L Ø d Ø d Ø d Tr H.
Size Tr x Dimensions [mm] d d min. d max. d H P,7,, Accuracy [ ã m/ mm] Straightness [mm/ mm] Lead angle at flank diameter Theoretical efficiency (for ã=,) Ý Mass of spindle per m Moment of intertia [-] [kg/m] [cm ] [cm ] [cm ] [kg m /m],,7,,,, x - Section modulus Polar moment of inertia Mass moment of inertia Tr x Tr x,7, 9,,,,,7,7, x -,7,,,,,7,9,9, x - Tr x 7,,7, 7, 9,7,,7,7,, x - Tr x,, 7,, 7,9,9,9,, x - Tr x,,,,,,9, 7, 9, x - Tr 9 x 9,, 7,,7,,97, 7,7, x - Tr x 9, 9,,,,7,9,,, x - Tr x,,,, 7,7,,,, x - Tr x,,,,7,7 7, 7,7,, x - Tr x 9, 9,7 Only valid for versions in standard materials. General tolerances to DIN ISO 7 - medium.,,9, 7,7,,, x -. 9
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed n in. - [min ] 7 7 9 9 Lifting velocity [mm/min] Vlift [mm/s],,,,,,,, 7,,,7,,,, 7, 7,9,, 9,,7,,7, 7, 7,, 7,,,, 9, 7, Ratio i N - L Effective load F [kn] eff.,, P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in.,,,,,,9,,,,,,,,,,,,,,7,,,,,,,,,,,,,,9,,,,,,,,,,,,,,7,,,,,,,,,,,,,,9,,,,,,,,,,,,,,7,,,,,,,,,,,,,,9,,,,,,,7,,,,,,,7,,,,,,,,,,,,,,9,,,,,,,,,,,,,,7,,,,,,,7,,,,,,,9,,,7,,,,,,,,,,,7,,,,,7,,9,,,,,,,9,7,,9,,, - -,,,,,,7,,,,,,,,,,,,,7,9,,,,,, - -,,,,,,7,,,7,,,,,,,,,,,9,,,, - - - -,,,,,,7,7,,,,, - -,,,,,9,9,,,, - - - -,,,,,,7,,,9,,, - -,,,,,,9,,,, - - - -,,,,,7,7,9,,,,, - -,,,,,,9 - - - - - - - -,,,,,,7,,,, - - - -,,,,,,9 - - - - - - - -,,,,,,7,,,, - - - -,,,,,,9 - - - - - - - -,,,,,9,7,,,, - - - -,,,7,,,9 - - - - - - - -,,,,,,7,,,, - - - -,,,7,,,9 - - - - - - - -,,,,,,7,,,, - - - - Please enquire for other operating conditions..
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff.,, nin. [min-] [mm/min] Vlift [mm/s] i N - L P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. 7 7 9 9,,,,7,,,, 7,,,,,,, 7, 7,9,, 9,,,,, 7,,,,,,,, 7,,,,,,,,,,,, 9,,,,,,,,,7,,,,,,,,,,,,,,,,,,, 9,,,,,,,,,7,,,,,,,,,,,,,,,,,,,9 9,,,,,,,,,7,,,,,9,,,,,,,,,,,,9,,9 9,,9,,,,,,,7,,,9,,,,,,,,,,,,,,,,9 9,,,,,,,,,7,,,,,,,,,,,,,,,,,,, 9, - -,,,,,,7,7,,,,,,,,,,,,,,9,,9, - - - -,,,,,,7,9,,,,7,,,,,,,,,,,,, - - - -,,,,,,7,,,,,,,,,,,,,,,,,, - - - -,,,,,,7,,,,,,,,,,,,,,,9, - - - - - -,,,,,7,7,,,7,,, - -,,,,,,,, - - - - - -,,,,,7,7,,,,,, - -,,,,,,,, - - - - - -,,,,,,7,,,,,9, - -,,,,,9,,9, - - - - - -,,,,,9,7,,,, - - - -,,,,,,,, - - - - - -,,,,,,7,9,,9, - - - -,,,,,,,, - - - - - -,,,,,,7,,,, - - - -,,,,,,,, - - - - - -,,,,,,7,,,, - - - - Please enquire for other operating conditions..
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed n in. - [min ] 7 7 9 9 Lifting velocity [mm/min],,,,7,,,, 7,,,,,,, 7, 7,9,, 9,,,,, 7,,,,,,,, 7, Please enquire for other operating conditions. Vlift i P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. [mm/s] N - L Ratio Effective load F [kn] eff.,,,,,,,,,, 9,9,, - -,,,,9,,,,,,,, - -,,,,,,,,, 9,9,, - -,,,,9,,,,,,,, - -,,,,,,,,, 9,9,, - -,,,,9,,,,,,,, - -,,,,,,,,, 9,9,, - -,,,,9,,,,,,,9, - -,,,,,,,,, 9,9,, - -,,,,9,,,,,9,,, - -,,,,,7,,,, 9,9 - - - -,,,,9,,,,,,,, - -,,,,,,,, - - - - - -,,,,9,,,9,,9,,9, - -,,,,,,,9, - - - - - -,,,7,9,,,,,,,, - -,,,7,,,,, - - - - - -,,,,9,,,,,9,,, - -,,,9,,, - - - - - - - -,,,9,9,,,9,,,,, - -,,,,,, - - - - - - - -,,,,9,,,,,, - - - -,,,,,, - - - - - - - -,,,,9,,,,,, - - - -,,,,,, - - - - - - - -,,,,9,9,,9,,, - - - -,,,7,,, - - - - - - - -,,,,9,,,, - - - - - -,,,9,,9, - - - - - - - -,,,,9,,,, - - - - - -,,,,,, - - - - - - - -,,,,9,,,, - - - - - -.
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff., n in. - [min ] 7 7 9 9 [mm/min],97,,,7,9 9,,9,,9,,97, 7,,,7 7,,7,9, 9,7,, 7,7 7,9,7,,, 9,,,,9 7,,,,7 9, 9,7,9,,,,,,,7, 79,,, 7,,, 7 9, 7, 7, Please enquire for other operating conditions. Vlift i P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. [mm/s] N - L,,,,9, 7,9,,,,,7, - -,,,,,,9, 7,9,,,, - -,,,,9, 7,9,7,,,,, - -,,,,,,9, 7,9,,,, - -,,,,9,7 7,9,,,,,, - -,,,,,,9, 7,9,,,, - -,,,,9, 7,9,,,7,,, - -,,,,,,9, 7,9,7,,9, - -,,,,9, 7,9,, - - - - - -,,,,,,9, 7,9,9,,, - -,,,,9, 7,9,, - - - - - -,,,,,,9, 7,9,,,, - -,,,,9, 7,9,, - - - - - -,,,,,,9, 7,9,7,,99, - -,,,9,9, 7,9 - - - - - - - -,,,,,9,9, 7,9,, - - - -,7,,,9, 7,9 - - - - - - - -,,,7,,,9, 7,9,99, - - - -,9,,7,9,7 7,9 - - - - - - - -,,,9,,7,9,7 7,9 - - - - - -,,,,9, 7,9 - - - - - - - -,,,,,,9, 7,9 - - - - - -,,,,9 - - - - - - - - - -,,,,,,9 - - - - - - - -,,,9,9 - - - - - - - - - -,,,,,9,9 - - - - - - - -,7,,,9 - - - - - - - - - -,,,7,,,9 - - - - - - - -,9,,7,9 - - - - - - - - - -,,,9,,7,9 - - - - - - - -,,,,9 - - - - - - - - - -,,,,,,9 - - - - - - - -.
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. n in. - [min ] 7 7 9 9 [mm/min] 7,,,,,,7 7,,,, 7,, 9,, 7,,,,, 7,,, 7, 9,,, 9,,, 7, 7, 7, Please enquire for other operating conditions. Vlift i P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. [mm/s] N - L,,9,,9, 7,,7 7,, 9,, 9 - -,,,,,,,9,,,, - -,,9,,9, 7,,7 7,, 9,, 9 - -,,,,,,,,,,, - -,,9,,9, 7,,9 7,,99 9,,9 9 - -,,,,,,,7,,,, - -,7,9,7,9,9 7,, 7, - - - - - -,9,,,,7,,,,,,9 - -,,9,,9,99 7, - - - - - - - -,,,,,,,,,, - - - -,,9,,9,9 7, - - - - - - - -,,,,,,,9,,, - - - -,7,9,,9 - - - - - - - - - -,,,7,,,,, - - - - - -,7,9,7,9 - - - - - - - - - -,,,,,7, - - - - - - - -,,9,,9 - - - - - - - - - -,,,,,, - - - - - - - -,,9,,9 - - - - - - - - - -,7,,,,, - - - - - - - -,,9,,9 - - - - - - - - - -,,,,,, - - - - - - - -,7,9 - - - - - - - - - - - -,9,,, - - - - - - - - - -,,9 - - - - - - - - - - - -,7,,, - - - - - - - - - -,,9 - - - - - - - - - - - -,,,, - - - - - - - - - -,7,9 - - - - - - - - - - - -,,,7, - - - - - - - - - -,7,9 - - - - - - - - - - - -,9,,, - - - - - - - - - -.
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. 7 n in. - [min ] 7 7 9 9 [mm/min] 7,,,,,,7 7,,,, 7,, 9,, 7,,,,, 7,,, 7, 9,,, 9,,, 7, 7, 7, Please enquire for other operating conditions. Vlift i P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. [mm/s] N - L,,,,,7 9,,,7, 9,,,,,,,7,, 7,, 97,,,,,,,9 9,,,, 9,,,,,,,7,,77 7,, 97,,,,,,,9 9,,, - - - -,,,,,9,7,, 7,, 97,,,9,,9,, 9, - - - - - - - -,,,9,,,7,9, 7,, 97, - -,,,, - - - - - - - - - -,,,,,9,7, - - - - - -,7,,, - - - - - - - - - -,,,,,9,7,9 - - - - - -,9, - - - - - - - - - - - -,9,,9,,7,7 - - - - - - - -,, - - - - - - - - - - - -,,,,,,7 - - - - - - - -,, - - - - - - - - - - - -,7,,,,,7 - - - - - - - -,, - - - - - - - - - - - -,,,7, - - - - - - - - - -,, - - - - - - - - - - - -,,,9, - - - - - - - - - - - - - - - - - - - - - - - -,7, - - - - - - - - - - - - - - - - - - - - - - - - - -,9, - - - - - - - - - - - - - - - - - - - - - - - - - -,7, - - - - - - - - - - - - - - - - - - - - - - - - - -,, - - - - - - - - - - - - - - - - - - - - - - - - - -,9, - - - - - - - - - - - -.
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. 7 n in. - [min ] 7 7 9 9 [mm/min] [mm/s] 7,,,,,,, 7,,,, 7,, 9,, 7 7,,,, 9, 7, 9,, i N - L,,,,,,,,,,, P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in.,,9,9 9,,,7,,,,,, - -,9,,,,7 7,, 9,,,9,7, - -,,9, 9,,,7,7,,,,, - -,7,,,,7 7,,97 9,,9,9,9, - -,,9,9 9,,,7,,,, - - - -,7,,,,9 7,,9 9,,9,9,9, - -,9,9,9 9,,9,7 - - - - - - - -,,,,, 7,,9 9,,,9,7, - -,,9,9 9, - - - - - - - - - -,9,,,,9 7,, 9,,77,9 - - - -,9,9,9 9, - - - - - - - - - -,,,,,7 7,, 9, - - - - - -,9,9 - - - - - - - - - - - -,,,,,7 7, - - - - - - - -,,9 - - - - - - - - - - - -,,,9, - - - - - - - - - - - - - - - - - - - - - - - -,9,,7, - - - - - - - - - - - - - - - - - - - - - - - -,, - - - - - - - - - - - - - - - - - - - - - - - - - -,7, - - - - - - - - - - - - Please enquire for other operating conditions..
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. n in. - [min ] 7 7 9 9 [mm/min] [mm/s] i N - L 7,,,,,,9, 9,,7, 9 - -,,9,,7 7,,7,9 77, - -,,,9,,7, 9,7, - - - -,,7,,7 7,,9, 77, - -,,,7,,7, 9, - - - - - -,,7,,9 7,,97,7 77 - - - - 7,,,,, - - - - - - - - - -,,,, 7,,,7 77 - - - -,,,7,, - - - - - - - - - -,,9,,97 7, - - - - - - - - 7,,,, - - - - - - - - - - - -,,,,7 7,7 - - - - - - - - 9,,,, - - - - - - - - - - - -,,,, 7 - - - - - - - - - - 7 7,,,, - - - - - - - - - - - -,,,, 7 - - - - - - - - - -,,,, - - - - - - - - - - - -,,97,,9 7 - - - - - - - - - - 9,, - - - - - - - - - - - - - - 7,,, - - - - - - - - - - - -,, - - - - - - - - - - - - - -,,7, - - - - - - - - - - - - Please enquire for other operating conditions. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in.. 7
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. n in. - [min ] [mm/min] [mm/s] 7,,,,,,, 7,,,, 7,, 9,, i N - L,,,,,,, P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in., 9,,,9,7,, 9, 77,, 7, - -,,,9,,9 7,,,9,,,7 - -,7 9,,,9,,,7 9, 77,,7 7, - -,9,,9,, 7,,,7,,7,7 - -, 9,,,9,7, - - - - - - - -,,,79,,7 7,,,, 7,,7 - -, 9, 7,,9 - - - - - - - - - -,7,,7,, 7,,9 - - - - - -,7 9, - - - - - - - - - - - -,7,,, 7, 7, - - - - - - - - - - - - - - - - - - - - - -,,,9, - - - - - - - - - - - - - - - - - - - - - - - -,, - - - - - - - - - - - - Please enquire for other operating conditions..
SGT 7 Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. 7 n in. - [min ] 7 7 9 9 [mm/min] [mm/s] 7,,,,,,7 7,,,, 7,,7 9,, 7,,,,7, 7,,, i N - L,,,,,,,,,,, P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in.,9 7,,,,7,,,,,, 9,7, 99,, 99,, 9,, 97,9, 97,,,,9 7, 7,,,,, 7,,,9, - - - -, 99,, 99,, 9,, 97,9, 97,,, 7, 7, 7, 7,, - - - - - - - - - -, 99,, 99,, 9,, 97,9 - - - - - -, 7,,7, - - - - - - - - - -, 99,, 99, 9, 9, - - - - - - - - 7, 7, - - - - - - - - - - - -, 99,, 99, - - - - - - - - - -,9 7, - - - - - - - - - - - -, 99, - - - - - - - - - - - - - - - - - - - - - - - - - -, 99, - - - - - - - - - - - - - - - - - - - - - - - - - - 7, 99, - - - - - - - - - - - - - - - - - - - - - - - - - -, 99, - - - - - - - - - - - - - - - - - - - - - - - - - - 9, 99, - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Please enquire for other operating conditions.. 9
SGT Input power and torque Input power P in. [kw] Permitted input torque to worm shaft M in. [Nm] Valid for grease lubrication only! F eff. P in. Min. n in. Input speed Lifting velocity Ratio Effective load F [kn] eff. n in. - [min ] 7 7 9 9 [mm/min] [mm/s],, 7,,,,,,9,,,,9,,7,,,,,7,,9 77,,,,, 7 9,,9,,, 7,, 7 7,, 9, i N - L P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in. P in. M in.,,,7 7,,, - -,7, 7,99 79,,, 7 - -,, 7, 7,,9 - - - -,,7 7,97 79,, 9, 7 - -,, - - - - - - - - - -,7, 7 7,9 79, - - - - - -,9,7 - - - - - - - - - -,, 7,9 79 - - - - - - - -, - - - - - - - - - - - -, 9,7 7 - - - - - - - - - -,7 - - - - - - - - - - - -,, 7 - - - - - - - - - -,7 - - - - - - - - - - - -, - - - - - - - - - - - - - - - - - - - - - - - - - - 7,9 - - - - - - - - - - - - - - - - - - - - - - - - - - 9, - - - - - - - - - - - - - - - - - - - - - - - - - -, - - - - - - - - - - - - - - - - - - - - - - - - - -, - - - - - - - - - - - - Please enquire for other operating conditions..
Installation of SGT screw jacks Worm shaft - mounting orientation - worm shaft orientation Recommended guidelines for screw jack arrrangements: -Spindle in tension -Housing in compression -Fixing screws unloaded Worm shaft: = left = double ended = right Mounting orientation: I (upright) Worm shaft orientation: (for wall mounting) z III (wall mounted) -x y x -z II (inverted) Ordering example: Screw jack Size Basic design (see page / ) Spindle above Spindle end standard version Ratio N (normal) Worm shaft double ended Mounting orientation Worm shaft orientation SGT GO - - N - - III/ - S Special version.
Suggested drive arrangements - mechanically synchronised Examples When designing screw jack arrangements, the operating requirements, the load to be moved and the stroke must be known. Additional loads which are not axially transmitted must be taken into account. Once the number of jacks and their orientation is established the load must be calculated for individual jacks. Next the drive train for the screw jacks is established. Example X Please observe the following guidelines: all screw jacks in the arrangement examples have the same sense of rotation the number of connecting links is as small as possible the motor should be located close to the most heavily loaded screw jacks Example 7 X Arrangement examples X and Y are centre distances Example Example X Example Example 9 X X Example X Y Example Example Example X Y Y X X.
Suggested drive arrangements - mechanically synchronised Example Example X X Y Example X Example Example X X Y Y Example X Example X Example 7 Y X.
Installation examples SGT - SGT F F F F F F F F F F F 9.
Dimensioning of screw jack systems Selection path Establish length of spindle [mm], lifting speed V [m/min] and effective load F lift eff. [kn] for each screw jack The calculation of duty rating ED [%/h] (see page ) is unneccessary when relatively little use is made of the system. E.g. callibration or similar activities. Initial selection based on effective load F [kn], lifting speed V [m/min] and duty ED [%/h]. (see pages / 7/ ) eff. lift No Is the spindle compressively loaded? Yes Checking the tendency to buckling F [kn]. (see pages / 7) crit. GO/ GU Version LO / LU or version GO / GU? LO/ LU Checking the critical spindle speed n [/min]. (see page ) crit. Calculating the torque in the lifting spindle M [Nm]. (see page 9) sp. Should a ball screw be considered? Calculation of the required input torque M [Nm] per screw jack. (see page 9) in. Calculation of the total required input torque M [Nm] for the screw jack system. (see page ) tot. Calculation of the required input speed n [/min]. (see page 7) in. Calculation of the required input power P [kw]. (see page 7) in. Calculation of the actual lifting speed V [m/min] (see page 7) and selection of the motor. (see page 9) lift act. 7.
Definition of the applied loads, torques and speeds F [kn] effective lifting load of the screw jack eff. F [kn] maximum radial load r max. M [Nm] input torque in. M [Nm] maximum input torque max. M [Nm] torque in the lifting spindle sp. n [/min] input speed in. n [/min] spindle speed (only running nut design) V [m/min] lifting speed lift F eff. M sp. F eff. M sp. n F r max M / M / n in. m ax in. F r max M / M / n in. m ax in. 9.
Calculations Input speed n in. [/min] Required input speed n in. [/min] to achieve a partciular lifting speed [m/min] is calculated as follows: [m/min] n in. [/min] = i [-] P [mm] [m/min] lifting speed at the spindle P [mm] spindle pitch i [-] screw jack ratio Input power P [kw] in. per screw jack Required input power calculated as follows: P [kw] = in. Input power P [kw] machine for total system Overall required input power P machine [kw] for the complete system (screw jack, connecting shafts, bevel gear units) is calculated as follows: P [kw] = machine P [kw] in. F eff. [kn] [m/min] tot. F eff. tot. [kn] [m/min] tot. machine for a particular screw jack is F eff. [kn] effective lifting load of the screw jack [m/min] lifting speed at the spindle tot. [-] total working efficiency (see table) Order code N - i - L η tot. SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT 7 SGT SGT,,,,,,,,,,,,,,,,,9,,,,,9,,,, F eff. tot. [kn] effective load to be lifted for the system [m/min] lifting speed at the spindle tot. [-] total working efficiency (see table) machine [-] efficiency of the system (see page ) Actual lifting speed V lift act. [m/min] In most cases the required input speed n in. [/min] differs from the motor speed. The actual lifting speed act. [m/min], which will be achieved based on motor speed n motor [/min] is calculated as follows: V [m/min] = lift act. n [/min] P [mm] motor i [-] act. [m/min] actual lifting speed n motor [/min] motor speed P [mm] spindle pitch i [-] screw jack ratio. 7
Calculations Maximum radial load worm shaft F [N] r max. at the Maximum input torque M [Nm] max. Maximum radial load at the worm shaft F r max. [N] The worm shaft can experience radial loads due to gears, sprockets or belt pulleys. To avoid exceeding the max radial load F r max. [N] the minimum shaft diameter D min. must be calculated. Order code SGT SGT F r max. [N] M max. [Nm],9 9 P in. [kw] M max. [Nm] D min. [m] = = F r max. [N] n in. [/min] F r max. [N] SGT SGT SGT 7, D [m] smallest diameter min. P [kw] input power in. F [N] maximum radial load (see table) r max. n in. [/min] input speed at the worm shaft M max. [Nm] maximum input torque (see table) SGT SGT SGT SGT 9 79 SGT 7 7 7 l SGT l/ Ø D F r max. Duty ED [%/h] The duty ED [%/h] is derived from the time in operation (lifting and lowering) and the inactive time between successive operations. Example: Lifting Lowering Inactive s s s s s s s s s Total cycle = s ED per cycle in % = % Cycles per operating day= ED [%/h] = Stroke [m] LS V [m/min] lift Stroke [m] working stroke of the screw jack [m/min] lifting speed LS [-] number of loaded operations.
Calculations Input torque M [Nm] in. P in. [kw] input power (see page 7) n in. [/min] input speed at the worm shaft at the worm shaft The input torque M in. [Nm] at the worm shaft is calculated as follows: M [Nm] = in. P [kw] 9 in. n [/min] in. Selection of the motor The required motor can be selected from the power P in. [kw] and the input speed n in. [/min]. Notes about motor selection: The motor selected should be able to overcome the breakaway torque of the system which can be considerably higher than the calculated input torque. This relates particularly to systems where there is poor efficiency and long idle periods. Following selection of the drive motor it should be checked whether the transmission elements and the screw jacks may be overloaded by the selected motor. For maximum input torque M [Nm] see the adjacent table. max. When using some trapezoidal spindles a brake motor should be selected since self locking cannot be guaranteed. In conditions of heavy vibration the self locking capability of some screw jacks can no longer be guaranteed. In such cases, or where it is possible that such vibration may occur, a brake motor must be specified. To minimise the possibility of damage to the screw jack system, end of travel limit switches should be fitted. E.g. electro-mechanical devices or inductive proximity devices. Torque M [Nm] sp. in the lifting spindle The torque in the lifting spindle M sp. [Nm] is that torque that the lifting spindle exerts at the spindle end in basic design. In the running nut design M sp. [Nm] is that torque which the running nut exerts on the spindle due to the load. M [Nm] = sp. F [kn] P [mm] lift dyn. spindle Order code η ) spindle SGT SGT SGT SGT SGT SGT,,,,7,, F lift dyn. [kn] dynamic lifting load on the screw jack P [mm] spindle pitch (see page, 7) spindle [-] efficiency of the spindle (see table) SGT SGT SGT SGT 7,7,,,7 SGT,9 ) only applies for trapezoidal spindles; for ball screw spindles η spindle=,9. 9
Calculations Total input torque M [Nm] tot. The total torque M tot. [Nm] required for the system comprises the llifting load torque, plus losses due to flexible couplings, cardans, support bearings and bevel gearboxes. The following example shows the derivation of the total torque M tot. [Nm]. M ( in. M in. η cardan shaft η cardan shaft ) M tot. = + η K M tot. [Nm] total input torque M in. [Nm] input torque for screw jack M in. [Nm] input torque for screw jack η cardan shaft [-] Efficiency of cardan shaft with support bearing (dependent on the length and the number of support bearings ca..7 to.9) η k [-] efficiency of bevel gearbox (ca..9) Note: If a bevel gearbox with a ratio i k [-] of greater than is used then the torque and input speed must be modified accordingly. Important: The breakaway torque of the system can be considerably higher than the calculated input torque. This applies particularly to systems with poor efficiency and long idle periods. screw jack coupling phase motor support bearing cardan shaft screw jack bevel gearbox cardan shaft support bearing.
Calculations Spindle efficiency [-] spindle The spindle efficiency [-] is calculated as follows: spindle spindle [-] = tan tan( + ) [-] lead angle at flank diameter... ( ) ( ) P = arctan...single start spindle d P h = arctan...multistart spindle d [-] wear angle of the spindle (based on,9 for well greased spindle) P [mm] spindle lead - multistart h (example: Tr x P7; P h=) P [mm] spindle lead - single start (example: Tr x7; P=7) pitch of spindle - multistart (example: Tr x P7; P=7) d [mm] flank diameter of spindle d = d-, P d [mm] external diameter of spindle Surface stress in thread p [N/mm²] Calculation of surface stress p [N/mm²] in thread: p [N/mm²] = F [N] P [mm] lift dyn. l [mm] d [mm] H [mm] F lift dyn. [N] dynamic lifting load on the screw jack P [mm] lead for single start spindle; pitch for multistart spindle l [mm] length of nut thread d [mm] flank diameter of spindle H [mm] flank engagement Life calculation The life L h [h] for the ball screw spindle or bearing is calculated as follows: L [h] = h C dyn. [kn] F lift dyn. [kn] C dyn. [kn] dynamic load rating of ball screw spindle/ ball bearing F lift dyn. [kn] dynamic lifting load on the spindle when in motion (axial) n [m/mm] ball screw spindle/ ball bearing speed n = L [h] h ( ) n [m/min] n [/min] input speed at the worm shaft in. n in. [/min] i [-] ball screw spindle / ball bearing.
Calculations Critical spindle speed n crit. (only running nut design) Rotating spindles are subject to vibration due to resonance. All rotating spindles should be checked for speed n [/min] vs permitted speed. Method:. Determination of the spindle speed n [/min] n [/min] = V [m/min] lift P [mm] Tr x Tr x Tr x Tr x7. Obtain the critical spindle speed n crit. [/min] from the graph. The spindle size and the length L n [mm] is required.. Determination of the permitted spindle speed n perm. [/min]: n [/min] =, n [/min] f [-] perm. crit. n n crit. [/min]. The permitted spindlle speed n perm. [/min] must be greater than the actual spindle speed n [/min]. n > n perm. f =, n 7 9 7 9 L n [mm] L n f = n 7 9 Tr x Tr x Tr 9x Tr x Tr x Tr x Tr x L n f =, n L n n crit. [/min] 7 9 f =, n L n L n [mm].
Calculations Permissible side loading F [kn] S on the spindle due to compressive loads The permissible side loading F S [kn], resulting from compressive axial loading F a [kn], can be obtained from the graph below: Important: The permitted side load F s acting via the spindle to the running nut leads to increased edge pressure in the actuating spindle. Wear is increased and life reduced. If in doubt consult our engineers! Buckling safety factor: Comparative stress: Tetmajer:... Euler: é Vmax. < é Vperm. é é é ê = + ² + ² V ( B D ) t F a Spindle Tr x a F S 9 7 a = a = a = 7 a = a = a = Side load F S [N] For GO-GU with second guidance collar For LO-LU only for static loading Axial load Fa [kn] Spindle Tr x Spindle Tr x,,9,,7 a = a = 7 a = a = a = a =,,,, a = a = 7 a = a = a = a = Side load F S [kn],,,, Side load F S [kn],,,,,,,, Axial load Fa [kn] Axial load Fa [kn].
Calculations Permissible side loading F [kn] S on the spindle due to compressive loads Buckling safety factor: Tetmajer:... Euler: Comparative stress: é Vmax. < é Vperm. é é é ê = + ² + ² V ( B D ) t Important: The permitted side load F s acting via the spindle to the running nut leads to increased edge pressure in the actuating spindle. Wear is increased and life reduced. If in doubt consult our engineers! Spindle Tr x7 Spindle Tr x,,7,, a = 7 a = a = a = a = a =, 7,,, a = a = a = a = a = Side load F S [kn],,, Side load F S [kn],,,,9,,,,, Axial load Fa [kn] 9 Axial load Fa [kn] Spindle Tr x Spindle Tr 9x 9 7 a = a = a = a = a = a =,,,, a = a = a = a = a = 7 Side load F S [kn] Side load F S [kn] 9, 7,,,,, Axial load Fa [kn] Axial load Fa [kn].
Calculations Permissible side loading F [kn] S on the spindle due to compressive loads Buckling safety factor: Tetmajer:... Euler: Comparative stress: é Vmax. < é Vperm. é é é ê = + ² + ² V ( B D ) t Important: The permitted side load F s acting via the spindle to the running nut leads to increased edge pressure in the actuating spindle. Wear is increased and life reduced. If in doubt consult our engineers! Spindle Tr x a = a = a = a = a = 7 7 Spindle Tr x 7 a = a = a = a = a = a = a = Side load F S [kn] Side load F S [kn] 9 7 7 Axial load Fa [kn] Axial load Fa [kn] Spindle Tr x 7 a = a = a = a = a = a = a = Spindle Tr x a = a = a = a = 7 a = a = a = Side load F S [kn] Side load F S [kn] 7 7 7 Axial load Fa [kn] Axial load Fa [kn].
SGT l l l SGT screw jack Calculations Critical buckling loads F [kn] crit. on the spindle Under compressive loading slim spindles tend to buckle. For this reason all compressively loaded spindles must be checked for permitted axial loading. Euler case Euler case Euler case Safety margin Tetmajer:... increasing Euler : Safety margin Tetmajer:... increasing Euler : SG T S GT SGT F crit. [kn] F crit. [kn] S GT SGT SGT SGT SGT S GT SGT SG T Spindle length l [mm] Spindle length l [mm].
Calculations Critical buckling loads F [kn] crit. on the spindle Safety margin Tetmajer:... increasing Euler : Safety margin Tetmajer:... increasing Euler : SGT S GT SGT F crit. [kn] S G T SGT F crit. [kn] SGT SGT S GT SGT Spindle length l [mm] Spindle length l [mm] Safety margin Tetmajer:... increasing Euler : Safety margin Tetmajer:... increasing Euler : S GT SGT SGT 9 SGT SG T S G T SG T 7 7 SGT 7 SGT 7 F crit. [kn] F crit. [kn] S GT 7 SGT SG T Spindle length l [mm] Spindle length l [mm]. 7
Gear housing material Selection table Gear housings for ALBERT-screw jacks are manufactured from the best possible materials. Alongside the standard materials there are a number of other options. If the adjacent table does not contain the material you require, please ask. Screw jack size Al GG Inox / VA St GS GGG ) ) ) ) ) ) SGT SGT SGT SGT SGT SGT SGT SGT SGT SGT 7 SGT ) Aluminium ) Grey cast iron ) Corrosion resistant version ) St ) Cast steel ) SG iron - standard - option - not possible.
Installation and maintenance Assembly Maintenance of SGT to SGT For ease of installation, ensure machined mounting faces are provided with through bored holes. Important: It should be ensured, wherever possible, that spindle nut fixing screws are compressively loaded. F The spindle should be regularly cleaned and relubricated. Every operating hours or every months the grease in the gear housing should be replaced.. Dismount the screw jack and clean.. Disassemble the spindle and spindle protection tube. (only for translating spindle). Remove locking screw for gear housing cover.. Wash out the gear housing and components with a suitable wash medium.. Refill with grease according to the table below. F F When carrying out maintenance, check wear on the spindle nut. Measure the axial play between the spindle and the nut. The maximum values are shown in the table. If the maximum values have been exceeded the gear unit must be overhauled. Ideally return to Albert for restoration to functional condition. After checking the wear the unit should be re-assembled by a fitter. Check carefully that rotation is smooth and light and free from axial play. This is a short version of recommended maintenance. With each order acknowledgement the current version of the complete Installation and maintenance instructions will have been provided. Order code Grease quanitity [kg] max. axial play [mm] SGT,, SGT,, SGT,, The screw jack should be aligned using a spirit level. Parallel alignment between the lifting system and the guide mechanism must be carefully checked. SGT SGT,,,7, Screw jacks systems should be checked for twisting and for tight spots. To check this the lifting system should be actuated by hand over the entire stroke. The force required should be light and even. SGT SGT SGT,7,,,,, The direction of rotation of the screw jacks should be carefully checked. SGT SGT 7,,,, Before test running the spindle(s) must be cleaned and if possible sprayed with an aerosol grease lubricant over the entire stroke length. SGT,, When test running:. Check the function and position of any limit switches.. Test the lifting system initially without load if possible.. Increase the load incrementally, checking for any hot spots and for gearbox temperature rise.. Check the tightness of all screwed connections. Important: Do not exceed the permitted loads, duty and input speeds. Failure to observe this will invalidate your guarantee. Recommended greases: The screw jack is factory filled with Castrol Spheerol EPL which complies with DIN : KP K- 7. 9
Questionnaire for quotation purposes Company:... Department:... Contact:... Date:... Tel.:... Fax.:... Address:... Project:... Loads: No. of screw jacks in system:... Axial load Total system Per spindle dynamic [kn] static [kn] dynamic [kn] static [kn] Compressive load Tensile load Type of loading: steady oscillating shock increasing vibrating Stroke: Stroke length [mm]... Lifting speed [m/min]:... Application information: Usage per day in hours Working cycle: actual in... sec. min. Example: Usage per day in hours Working cycle: actual in... sec. X min. Lifting Lifting Lowering Lowering Idle Idle Total cycle time Total cycle time ED per cycle in % ED per cycle in % Cycles per working day Cycles per working day Operational conditions: Environmental temperature from C... to C... dry humid dusty (define material):... other effects:... Details about the planned location and attitude Attitude: (upright) (inverted) (wall mounted) Spindle guidance: without guidance with guidance Requirements: Number of sets:... Quantity per year:... Required delivery:... Accessories: Please indicate the accessories required on the next page! For the best design please provide a drawing! 7.
Questionnaire Accessories for basic design GO (translating spindle) Tensile load, dynamic kn Tensile load, static kn Compressive load, dynamic kn Standard spindle end Standard spindle end Standard spindle end Standard spindle end Compressive load, static kn Standard spindle end Folding bellows Dimension L + stroke ) Dimension Z ) Stroke Spiral protective sleeve Motor adaptor Flexible coupling Motor Screw jack Pivot mounting Protective tube Rotation prevention Pivot fork Pivot base unit Travel limiter, linear cam Limit switch with angled lever Clevis attachment Square rotation preventer Hand crank ) Dimension Z = underside of gear housing to end of standard spindle, and ) Dimension L + stroke = underside of gear housing to centre of clevis bore standard spindle end 9.
Questionnaire Accessories for basic design GU (translating spindle) Tensile load, dynamic kn Tensile load, static Compressive load, dynamic Compressive load, static kn kn kn Limit switch with angled lever Clevis attachment Square rotation preventer Protective tube Rotation prevention Travel limiter, linear cam Motor Flexible coupling Motor adaptor Screw jack Pivot mounting Dimension L + stroke ) Dimension Z ) Stroke Pivot fork Pivot base unit Spiral protective sleeve Folding bellows Hand crank Standard spindle end Standard spindle end Standard spindle end Standard spindle end Standard spindle end ) Dimension Z = underside of gear housing to end of standard spindle, and ) Dimension L + stroke = underside of gear housing to centre of clevis bore standard spindle end 9.
Questionnaire Accessories for running nut design LO (rotating spindle) Tensile load, dynamic kn Tensile load, static kn Compressive load, dynamic Compressive load, static kn kn Standard spindle end Standard spindle end Standard spindle end Flanged nut ) Dimension Z ) Stroke Folding bellows Spiral protective sleeve Motor adaptor Flexible coupling Motor Screw jack Pivot mounting Pivot fork Pivot base unit Hand crank ) Dimension Z = underside of gear housing to end of spindle ) For further versions see catalogue accessories for SGT screw jacks. 9.
Questionnaire Accessories for running nut design LU (rotating spindle) Tensile load, dynamic kn Tensile load, static kn Compressive load, dynamic kn Compressive load, static kn Motor adaptor Flexible coupling Motor Screw jack Pivot mounting Pivot fork Pivot base unit Dimension Z ) Stroke Hand crank Folding bellows Spiral protective sleeve Flanged nut ) Standard spindle end Standard spindle end Standard spindle end ) Dimension Z = underside of gear housing to end of spindle ) For further versions see catalogue accessories for SGT screw jacks. 9.
Application examples Screw jacks system for paper industry, SGT GO configuration (Hermes PM), completely rust proof, yellow paint. Welding fixture with screw jack system SGT, integrated safety nut for both tensile and compressive loading. Screw jack SGT, special version, with integral guidance tube. Stroke mm. We reserve the right to make technical Maschinenfabrik ALBERT GmbH Phone: +/ ()7-9- 7. changes. For current information go to Technologiepark Fax: +/ ()7-9-99 www.albert.at or your local sales office. A- Gampern E-Mail: office@albert.at