10 million cycles. Improved durability. Shock Absorber/Soft type. RJ Series. Maximum operating cycles M6, M8, M10, M14, M20, M27

Transcription

1 Shock Absorber/Soft type Series M, M, M, M, M, M Improved durability RoS Long-term continuous operation has been realized by employing the pre-load mechanism, newly-developed oil seals. Maximum operating cycles million cycles Stops transported objects softly A smooth absorption characteristic is achieved by adopting the unique orifice mechanism to ease the impacts on conveyed objects. Lineup M M Resistive force Softened impact Soft rebounding after collision Smooth absorption characteristic A wider range of usage is possible. Stroke Rich variation Short stroke type for improving takt time for short stroke actuators. M M M M M M. absorbing time. Absorbing time [sec]... -L - -Short stroke type M M Short stroke type M M M... Energy [J] Reference values when cylinder thrust is N. Absorbing time varies depending on cylinder collision conditions. M M M Mounting interchangeable with the series. 9

2 Two types of absorbed energy are available as standard. Selectable in accordance with impact mass and collision speed Soft type and short stroke type are available as standard so as to be selectable according to usage conditions (impact mass, collision speed). Max. Absorbed Energy Model Soft type Collision speed (m/s). to. Max. absorbed energy (J) /L :. to /L :. to /L :. to /L :. to /L :. to /L :. to /L :. to /L :. to /L :. to./l :. to Short stroke type. to.. to.. to. Pre-load mechanism working principle ydraulic oil in the oil pocket is suppled into the pressure chamber by elasticity of the accumulator to replenish the slight decrease of oil caused by operations. Pressure Initial state Accumulator Oil pocket (hydraulic Oil flow path chamber ydraulic oil amount % oil filling chamber) Pre-load plug Transition of absorbed energy New structure operation In operation The oil pocket is compressed by elasticity of the accumulator. Slight decrease of oil is replenished with hydraulic oil from the oil pocket. Decrease of hydraulic oil + Replenished from the oil pocket Absorbed energy Current structure Operating cycles series ydraulic oil amount % recovered Cylinders with series <Made-to-Order (-XB) applicable products> For details, refer to page. Mechanically Jointed Rodless Cylinder MY,, series Magnetically Coupled Rodless Cylinder CY series Guide Cylinder MGG series Platform Cylinder CXT series Slide Unit CX series

3 Shock Absorbers Series Variations Shock Absorbers //L/Q series series Soft type series L series Coolant resistant type Q series Short type Series Allowable eccentric angle Short stroke type Model ( ): With urethane cap Q series ( ): With bumper (U) L(U) (U) L(U) (U) L(U) (U) L(U) (U) L(U) (U) (U) (U) (C) (C) (C) (C) (C) (C) (C) (C) L(C) L(C) L(C) L(C) L(C) L(C) Q(C) Q(C) Q(C) Q9(C) Q(C) Max. absorbed energy (J) Stroke absorption (mm). Collision speed (m/s). to. to. to. to. to. to. to. to. to. to.. to. to. to. to. to. to O.D. thread size M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. M x. Option Nut Stopper nut Foot bracket (Except Q) Page P. to P.9 to P.9 to P.9 to

4 Shock Absorber Series Model Selection Model Selection Graph Type of Impact Free horizontal impact Impact of air cylinder actuation (orizontal/upward) Check Model Selection Step z to c prior to use. L L L The model selection graphs q to! are at room temperature ( to C). Shock absorber Graph q/ Graph w/ Graph e/ Graph r/ Graph t/ Graph y/ L L Type of Impact Impact of air cylinder actuation (Downward) Check Model Selection Step z to c prior to use. Graph u/ Graph!/ L Graph i/ L Graph!/ L Graph o/ L Graph!/ L

5 Model Selection Series Model Selection Graph Type of Impact Free fall impact Check Model Selection Step z to c prior to use. The model selection graphs! are at room temperature ( to C). Graph!/ Graph!/ Graph!/ L L Graph!/ L Graph!/ L Graph!/ L Type of Impact Others (such as thrust impact or swing impact other than air cylinder actuation) Calculate equivalent mass Me from Model Selection Step z to m prior to use. Graph!9/ Equivalent mass Me [kg] Equivalent mass Me [kg] L Equivalent mass Me [kg] L Equivalent mass Me [kg] L Equivalent mass Me [kg] L Equivalent mass Me [kg] L

6 Shock Absorber Series Model Selection Model Selection Model Selection Step Example of Selection Type of impact Impact of thrust of load (orizontal) Impact of thrust of load (Downward) Impact of thrust of load (Upward) Free horizontal impact (Impact of inertial force) Free fall impact Swing impact (With torque) Type of impact Impact of thrust of load (orizontal) (Impact of thrust from sources other than air cylinder actuation) Shock absorber Operating conditions Symbol m υ h ω r F T n t µ Operating conditions Impact mass Collision speed Dropping height Angular speed Distance between rotational center and impact point Thrust Torque Operating frequency Ambient temperature Friction coefficient Unit kg m/s m rad/s m N N m cycle/min C Confirmation of specifications and precautions Ensure the collision speed, thrust, operating frequency, ambient temperature and atmosphere fall within the specifications. Be aware of the minimum installation radius in the case of swing impacts. Calculation of kinetic energy E Calculate kinetic energy E by using the formula according to the impact type. Note ) Collision speed υ Kinetic energy Thrust energy E E Absorbed energy E Note ) Equivalent mass Me Operating conditions Confirmation of specifications and precautions Calculation of kinetic energy E Confirmation of specifications υ. <. (max.),. (max.) t (min.) < < (max.) F < (max.) YES υ m υ F S E + E E υ m= kg υ=. m/s F = N n = cycle/min t = C Kinetic energy E Use Formula to calculate E by using. for m and. for υ. E. J Calculation of thrust energy E Calculate thrust energy E by selecting a model temporarily. Calculation of equivalent mass Me Calculate absorbed energy E to confirm it is not more than the maximum absorbed energy of the temporarily selected shock absorber. Equivalent mass Me = E υ Selection of applicable model Substitute the obtained equivalent mass Me, and the collision speed υ by using Model Selection Graph!9 to check if the temporarily selected model is compatible with the condition of application. If satisfactory, then the temporarily selected model will be the applicable one. on Selection Calculation of thrust energy E Calculation of equivalent mass Me Check adequacy of the selected model. Thrust energy E Select the L temporarily and obtain E by using the formula. E. J Equivalent mass Me Use Formula Absorbed energy E = E + E =. +. =. J to calculate Me by using E and. for υ. Me. kg Selection of applicable model According to the temporarily selected L satisfies Me =. kg <. kg, resulting in an operating frequency of n = <, without causing a problem. YES Select the L.

7 Model Selection Series Type of Impact Type of impact Impact of thrust of load (Downward) (Impact of thrust from sources other than air cylinder actuation) Impact of thrust of load (Upward) (Impact of thrust from sources other than air cylinder actuation) on conveyor (orizontal) Swing impact (With torque) Note ) Note ) Collision speed υ Kinetic energy E Thrust energy E Absorbed energy E υ m υ F S + m g S E + E υ m υ F S m g S E + E υ m υ m g µ S E + E ω R Ι ω T S R E + E Note ) Equivalent mass Me E υ E υ E υ E υ Note ) This is the momentary speed at which an object is impacting against a shock absorber. The collision speed is υ = υ when the speed (average speed υ) is calculated from the air cylinder s stroke time. Note ) This is the theoretical mass, which is converted into the mass of the impacting material under no thrust collision conditions. ence, E = Me υ Note ) R: The distance between rotational center and impact point. Set R at the minimum installation radius (. Rotating angle on page 9) or higher. <Symbol> Symbol E E E F g h Ι Note ) n R S T t υ m Me ω µ Specifications Absorbed energy Kinetic energy Thrust energy Thrust Gravitational acceleration (9.) Dropping height Moment of inertia around the center of gravity Operating frequency Distance between rotational center and impact point Shock absorber s stroke Torque Ambient temperature Collision speed Impact mass Equivalent mass Angular speed Friction coefficient Unit J J J N m/s m kg m cycle/min m m N m C m/s kg kg rad/s Note ) For the formula for moment of inertia Ι (kg m ), refer to the rotary actuator s catalog. on Selection In order for the shock absorbers to operate accurately for long hours, it is necessary to select a model that is well-suited to your operating conditions. If the impact energy is smaller than % of the maximum absorbed energy, select a model that is one class smaller. Use the and under the conditions mentioned below. : Cylinder bore size ø or higher or thrust N or higher : Cylinder bore size ø or higher or thrust N or higher

8 Shock Absorber Series RoS ow to Order U Shock absorber/soft type O.D. thread size/stroke Symbol O.D. thread size Stroke mm mm mm mm mm mm mm mm mm mm mm mm Collision speed range. to m/s L. to m/s Option Symbol exagon nut Stopper nut Nil pcs. J pcs. N S pcs. pc. SJ pcs. pc. SN pc. Note) : "Nil" or "N" only Nil U With urethane cap Specifications Model U U U U U Collision speed range L L L L L Max. absorbed energy (J) Note). O.D. thread size (mm) x. x x x. x. x. Stroke (mm) Collision speed (m/s). to. to. to. to. to. to. to. to. to. to.. to Max. operating frequency (cycle/min) Note) Extended Spring force (N) Compressed Max. allowable thrust (N) 9 9 Ambient temperature ( C) to (No freezing) Weight (g). Note) Max. absorbed energy and max. operating frequency values are at room temperature ( to C).

9 Shock Absorber Series RoS ow to Order Short stroke type U Shock absorber/soft type Symbol O.D. thread size/stroke O.D. thread size Stroke mm mm mm mm mm mm Option Symbol exagon nut Nil pcs. J pcs. N S pcs. SJ pcs. SN Stopper nut pc. pc. pc. Nil U With urethane cap Specifications Model U U Max. absorbed energy (J) Note).. O.D. thread size (mm) x x Stroke (mm) Collision speed (m/s). to Max. operating frequency (cycle/min) Note) Extended.. Spring force (N) Compressed.9. Max. allowable thrust (N) Ambient temperature ( C) to (No freezing) Weight (g) Note) Max. absorbed energy and max. operating frequency values are at room temperature ( to C). U. x... Replacement Parts No./Cap (Resin part only) C C Caps cannot be mounted on basic type. Please specify a type with cap when ordering. Cap Applicable model U, U U, U U, U U U

10 Series Construction w u! r! q e t! y i o Component Parts No. Description Material Treatment Tube Piston rod Piston Bearing Special steel Electroless nickel plating Special steel Electroless nickel plating Stainless steel Aluminum bearing alloy Spring guide Return spring Stopper O-ring Tool steel Steel wire Stainless steel Synthetic rubber Phosphate film Zinc trivalent chromating 9 Plug Accumulator Rod seal Special steel Electroless nickel plating Synthetic rubber Synthetic rubber exagon nut Carbon steel Zinc trivalent chromating w i! r! e t y! u o! q!!,,, w i! r!! q e t y! u o! Component Parts No. Description Material Treatment 9 Tube Piston rod Piston Bearing Spring guide Lock ring Return spring Stopper O-ring Special steel Special steel Stainless steel Special bearing material Tool steel Copper Steel wire Structural steel Synthetic rubber Electroless nickel plating Electroless nickel plating Zinc trivalent chromating Zinc trivalent chromating Electroless nickel plating No. Description Material Treatment Plug Special steel : Electroless nickel plating L: Black electroless nickel plating Accumulator Rod seal O-ring Cap bracket Cap exagon nut Synthetic rubber Synthetic rubber Synthetic rubber Structural steel Urethane Carbon steel Zinc trivalent chromating Zinc trivalent chromating

11 Shock Absorber Series Dimensions ø. M x.... Cap Cap bracket h MM øe ø ø (9.) 9..,,,, MM h ød C G LL S K B G Z LL S Model U U U U U The dimensions of /L type are the same. D. LL Dimensions MM M x. M x. M x. M x. M x. S G K 9 exagon nut B C h E.. LL Z.. Short stroke type Model U U U D. LL... Dimensions MM M x. M x. M x. S... G K 9 exagon nut B C h E.. LL.. 9. Z.. 9

12 Series Option exagon Nut ( pcs.are equipped as standard) Stopper nut For basic type For with cap For basic type S S S S S Part no. For with cap CS CS CS CS CS Material: Carbon steel Treatment: Zinc trivalent chromating Applicable Dimensions absorber B C h h MM d f.9. M x. 9. M x. 9.9 M x.. M x.. M x. Material: Special steel Treatment: Zinc trivalent chromating Dimensions Part no. MM h B C J J J J J J M x. M x. M x. M x. M x. M x Foot Bracket for Shock Absorber Replacement Parts Cap Dimensions X Part no. -X -X -X -X -X Material: Aluminum alloy Treatment: Black hard anodized Applicable absorber Replacement parts for a type with cap. Cannot be mounted on basic type. Part no. CC CC CC CC CC Material: Polyurethane Applicable Dimensions absorber A B SR U.. U 9.. U. U U B T x ød MM L Part no. B -X -X 9 -X -X -X D. drill, counterbore depth.. drill, 9. counterbore depth. 9 drill, counterbore depth. drill,. counterbore depth.. drill, counterbore depth L MM M x. M x. M x. M x. M x. T X Mounting bolt M M M M M 9

13 Series Specific Product Precautions Be sure to read this before handling the products. Refer to back page for Safety Instructions and pages to for Common Precautions. Danger. Absorbed energy Select a model so that the aggregated energy of an impacting material should not exceed the maximum absorbed energy. Otherwise, it could cause changes in properties or result in damaging the shock absorber.. Equivalent mass Select a model so that the equivalent mass should not exceed the allowable range. Otherwise, pulsation could occur in buffer capacity and deceleration force, thus making it difficult to absorb shock smoothly.. Collision speed Use the product within the specified collision speed range. Otherwise, it could cause the changes in buffer characteristics or result in damaging the shock absorber. Warning. Static load Design the system so that any other forces than the buffer capacity or impacts should not be applied to the piston rod which is stopped at the retracted state.. Maximum operating frequency Design the system in the conditions under which it is not used at the frequency exceeding the specified maximum operating frequency.. Stroke The specified maximum absorbed energy cannot be exerted unless the full stroke is used.. Work surface of an impacting material The contact surface of an impacting material with which the piston rod comes into contact must be highly rigid (hardness of RC or more). A high surface compression load is applied to the contact surface of the impacting material with which the piston rod comes into contact.. Be aware of the backlash of the impacting material. When used in a conveyor line, the object may be pushed back by the built-in spring force after energy is absorbed. For backlash, refer to the spring force in the specifications. (Pages and ). Selection of size As the number of operation proceeds, the maximum absorbed energy of shock absorbers will be decreased by the reasons such as deterioration, etc. of the internal working fluid. Taking this into consideration, selecting a size which is to % affordable against the amount of absorbed energy is recommended.. Resisitive force characteristics In general, the values of resisitive force (resisitive force generated during the operation) generated by the operating speed will vary in oil hydraulic shock absorber. The series can adapt to such this fast/slow speed and can absorb shock smoothly in a wide range of speed. But, take note the stroke time could be long, and the motion would not be smooth, etc., depending on the operating conditions. If this would be a problem, we recommend the stroke amount should be restricted by using our optional component stopper nut, etc. Selection. Parallel usage When using multiple shock absorbers in parallel, energy will not be divided evenly because of differences in product dimensions and devices. For this reason, select the following options. E= Ea/N/. E: Energy used per shock absorber Ea: All energies N: The number of shock absorbers used in parallel Danger Operating Environment. Operation in an environment which requires explosionproof When mounting in places where static electricity is accumulated, implement a distribution of electrical energy by grounding. Do not use materials for the buffer surface which might cause to spark by collision. Warning. Pressure Do not use the product in the vacuum state which is substantially different from the atmospheric pressure (above sea level) and in the atmosphere under being pressurized.. Using inside a clean room Do not use the product in a clean room, as it could contaminate the clean room.. Temperature range Do not use the product, exceeding the specified allowable temperature range. Seal could be softened or hardened or worn out, or leading to working fluid leak, deterioration, or buffer characteristic changes.. Deterioration by atmosphere Do not use the product in the presence of salt damage, sulfurous acid gas which makes the metal corroded, or solvent which makes the seal deteriorated.. Deterioration by ozone Do not use the product under the direct sunlight on the beach, or by the mercury lamp, or the ozone generator, because the rubber material will be deteriorated by ozone.. Cutting oil, water, blown dust Do not use the product under the condition where the liquid such as cutting oil, water, solvent, etc. is exposed either directly or in atomized form to the piston rod, or where blown dust could be adhered around the piston rod. This could cause a malfunction.. Vibration When vibrations are applied on an impacting material, implement a secure guide on the impacting material. 9

14 Series Specific Product Precautions Be sure to read this before handling the products. Refer to back page for Safety Instructions and pages to for Common Precautions. Warning. Before performing installation, removal, or stroke adjustment, make sure to cut the power supply to the equipment and verify that the equipment has stopped.. Installation of protective cover We recommend the protective cover should be installed for fear that workers might be getting close during the operation.. Strength of mounting frame The mounting frame needs to have sufficient strength. When deciding the strength of the mounting frame, consider the load applied to the mounting frame at the upper limit of operating conditions shown in the table below, and allow a sufficient safety factor. Model on mounting frame N N N 9 N N N N N N Note) on mounting frame is at room temperature ( to C).. Tightening torque and mounting thread When threading on the mounting frame in order to mount a shock absorber directly, refer to the prepared hole dimensions below. Observe the below tightening torque of a nut for shock absorber. If the tightening torque exceeds the value below, the shock absorber could be damaged. When a shock absorber is mounted on a cylinder, follow the torque values listed on each cylinder. Model Thread dimensions (mm) M x. M x. M x. M x. M x. M x. Thread prepared hole dia. (mm) ø ø. ø9. ø. ø. ø. Nut tightening torque (N m) Deviation of impact Mount the shock absorber so that the point of contact of an impacting material must be within the allowable eccentric angle range. If the eccentric angle is exceed, an excessive load could be placed on the bearings, resulting in oil leak in a short time. Allowable eccentric angle θ Mounting. Rotating angle If swing impacts are involved, the installation must be designed so that the direction in which a load is applied should be perpendicular to the shock absorber s axial center. The rotating eccentric angle to the stroke end must be θ. Allowable rotating eccentric angle θ Installation Requirement for Swing Impacts (mm) Model θ S R (Min. installation radius) (Allowable (Stroke) rotating angle) Do not scratch the sliding portion of the piston rod or the outside threads of the outer tube. Failure to observe this precaution could scratch or gouge the sliding potion of the piston rod, or damage the seals, resulting in oil leak or malfunction. Furthermore, damage to outside threaded portion of the outer tube could prevent the shock absorber from being mounted onto the frame, or result in a malfunction by internal component parts deformation.. Never turn the screw on the bottom of the body. This is not an adjusting screw. Otherwise, oil leak could occur. Piston rod Do not damage. Do not rotate bottom set screw. For with cap θ 9

15 Series Specific Product Precautions Be sure to read this before handling the products. Refer to back page for Safety Instructions and pages to for Common Precautions. Warning S: Shock absorber s stroke (Catalog values) Mounting. Adjust the stopping time by using a stopper nut. Control the stopping time of the impacting material by turning the stopper nut in or out (thus changing length a ). After establishing the stopper nut position, use a hexagon nut to secure the stopper nut in place. Capacity of shock absorbers deteriorate in accordance with usage. When crashing sounds or vibrations are generated during the operation, adjust the stopper nut and make the effective stroke (a) longer, or give the stroke enough leeway beforehand. S a Maintenance Stopper nut. Confirm that the mounting nut is not loosen. The shock absorber could be damaged if used in a loosen state.. Pay attention to any abnormal impact sounds or vibrations. If impact sounds or vibrations become abnormally high, the shock absorber may reach the end of its service life. Replace the shock absorber. If using continuously in such a state, equipment could be damaged.. Confirm that there is no oil leak on the outer surface. When a large amount of oil is leaking, replace the product, because it is believed to be happening something wrong with it. If using continuously in such a state, equipment could be damaged.. Check for cracks and wear in caps. For shock absorbers with caps, the caps will wear out first. Replace caps early to prevent damage to colliding objects. Storage. Position of the piston rod during storage If the product is stored for an extended period ( days or more) with the piston rod pushed, the absorption capacity could decrease. Avoid this kind of storage condition. Shock Absorber Replacement Period. The cylinder, eguipment and/or workpieces might be destroyed if the table collides the end of the stroke without being buffered properly by the shock absorber. Check the conditions periodically and adjust or replace the shock absorber, if necessary. About million cycles are possible within the catalog usage range (model selection graph range), so check the condition after. million cycles for the (room temperature: to C). Maximum operating cycles of million is confirmed under our in-house conditions (room temperature: to C, impact load factor %, linear cylinder collision), so by making a size selection with much leeway, long operational life will be possible. 9