Air Tube Disc Clutches and Brakes

Transcription

1 Air Tube isc lutches and rakes Spring-Set Air Release rakes Ring Very Low Inertia rive Plate Assembly onded or Riveted Shims Multiple Spud Airtube ub uctile enter Plate Airtube olding Plate rooved riction isc emountabl e ackplate Wichita Spring-Set Air Release rakes are ideal for fail safe protection of process equipment. onstructed of high strength cast iron, this improved design has thick friction discs for longer wear life. The fast acting air-tube design assures quick, smooth stops. No lubrication No adjustment Available in vertical mount Quick, simple installation xplosion proof design Selection requirements The selection of a Low Inertia rake is based on: 1. Torque required to stop a load. 2. riction area necessary to absorb rotational energy. 3. ontact velocity of rotating discs. 4. Maximum bore capacity of unit. 54

2 Selection Low Inertia Spring-Set rake To properly select a brake, the total rotating inertia, WR 2, must be reflected to the brakeshaft. Application ata: Refer to page 43, except, cyclic operation 7 rpm, and 218 Very Low Inertia lutch. Alternate Shaft WR 2 referred to clutch shaft = (Alternate Shaft WR 2 ) ( Alternate Shaft rpm ) 2 lutch rake Shaft rpm WR 2 referred to clutch-brake shaft = (39,091) ( 30 ) WR 2 referrred to clutch-brake shaft = lb.ft. 204 rpm rank Shaft WR 2 = lb.ft. 2 lutch-rake Shaft WR 2 = 78.2 lb.ft. 2 lutch ub and rive Plate WR 2 from Specification Table = 14.7 lb.ft. 2 (page 57) st. rake WR 2 = 14.7 lb.ft. 2 st. Total WR 2 = lb.ft. 2 rake Selection: Stopping angle of crank shaft =120 = Ø b Use 90 for calculation stimated time to stop: t = ( ) ( Øb crank shaft rpm ) = ( 90 ) ( 60 ) =.5 sec eceleration Torque = (12) ( WR 2 )( clutch-brake rpm ) 32.2 (9.5) (t) = (12) ( 953 )( 204 ) 32.2 (9.5) (.5) = 15,250 lb.in. rom duty chart (page 31) roup for spring set brake (SS): 214 SS rake is 28 P/100 rpm 90% torque rating = 24,800 lb.in. WR 2 of 214 SS VLI rake = 4.5 lb.ft. 2, therefore deceleration torque calculation is correct. *Average heat horsepower to clutch & brake. Ave. heat P = (Total WR2 ) (rpm 2 ) (cpm) 1.9 x 10 8 = (953) (41,616) (7) = 1.45 P 1.9 x 10 8 *heck with factory for heat capacity. Note: This application example is for preliminary sizing only. ontact a Wichita Sales ngineer or the factory for final selection. A P/100 rpm = 15,250 = 24 P/100 rpm

3 Air Tube isc lutches and rakes Size AT-xxx AT-xxx No. Spring-Set Air Release rakes (1) or high speed cyclic duty (2) Slow speed cyclic duty (3) olding and service brakes Type LI-SS for Low Inertia Spring Set rake VLI-SS for Very Low Inertia Spring Set rake Specifications Slip Torque Lb. In..3 * Minimum Air-Tube Pressure Size PSI or Released rake AT- 60 (1) 75(2) 90 (3) 106 2,225 2,900 3, ,300 5,600 7, ,700 4,800 6, ,100 9,100 12, ,200 10,500 11, ,600 20,000 26, ,500 18,600 24, ,600 35,400 46, ,400 40,400 51, ,000 77, , , , , , , , , , , , , , , , , , , , , ,335, ,255, ,921,000 * Max. recommended air pressure 130 PSI See Application actor hart Max. Swept ore Air Volume-Inches 3 riction Rect. Recommended Size Area Key New Worn learances AT- In 2 Inches Linings Linings Inches /16-3/ /16-3/ / /16-1/ / /32-5/ / /16-1/ / /32-5/ / /16-1/ / /32-5/ / /16-1/ / /32-5/ /32-5/ , /8-3/ / /32-5/ , / /8-3/ , / /32-5/ , / /8-3/ , /8-3/ , /32-7/ , /8-3/ , /32-7/ , /16-5/ , /4-3/8 Note: Very Low Spring Set rakes are available in sizes from AT-108 to AT

4 A *o Not xceed 90% Of Slip Torque Ratings Maximum orsepower Per 100 RPM Release Pressure - PSI Size 60 uty 75 uty 100 uty AT- A A A Low Inertia Spring Set Very Low Inertia Spring Set U U U U Total & P & P ffec. Total & P & P ffec. Size Wt. Wt. WR 2 Wt Wt. Wt. WR 2 Wt. AT- Lbs. Lbs. #t. 2 Lbs. Lbs. Lbs. #t. 2 Lbs Weight of internal clutch parts for use in calculating clutch engagement time. 57

5 Air Tube isc lutches and rakes Spring-Set Air Release rakes emountable ackplate a - Number of holes b - ole size A I J Z j k V Spring Set U i Y O Low inertia Very low inertia g - Tap f = No. of oles (See Note) A 7 omponent Parts 1. ub 2. ackplate 3. Socket ead apscrews 4. Ring 6 7 6A 5. Springs 6A. rooved riction isc (grooved on one side) 6. rooved riction isc (grooved on both sides) 7. enter Plate 11. Airtube 12. O.. Shims 13. Air Tube olding Plate 14. Socket ead apscrews 15. I.. Shims 16. Spring Release Plate 17. Airtube Spring Plate 18. Socket ead apscrews A imensions (onsult factory for drawing before final layout.) W X c - Number of holes d - Tap Note: Air ose Kits, see page No. AT- A I J O U / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Notes: Very Low Inertia Spring Set rakes are available in sizes from AT-108 to AT-224. See page 34. or mounting, use socket head cap screws conforming to the ASTM a. No. AT- V W X Y Z a b c d f g j k /32 4 5/ /4"NPT /32 4 5/ /4"NPT /32 6 1/ /2" NPT /32 6 1/2-13 1/2" NPT /32 6 5/ /2" NPT /32 6 5/8-11 1/2" NPT /32 8 5/ /2" NPT /32 8 5/8-11 1/2" NPT / / /2" NPT / /8-11 1/2" NPT / / /2" NPT / /8-11 1/2" NPT / / /2" NPT / /4-10 1/2" NPT / / /2" NPT / /4-10 1/2" NPT / /2" NPT / /2" NPT / /2" NPT / /2" NPT " N /2 6 1/2" NPT " N /2 1/2" NPT

6 Air Tube isc lutches and rakes Air ose Kits 8" QRV 6" QRV 8" " QRV 14" QRV 16" QRV 18" QRV 21" QRV 24" QRV 27" QRV Air hose kits contain all necessary parts (fittings, hoses and extensions) to completely plumb the brake air system. 30" QRV 36" QRV 42" QRV 48" QRV 60" QRV Optional Quick Release Valves can replace elbows on most units (see page 61). Roto-couplings (see page 61). 60 istribuidor Autorizado e Importador - Arten reios e mbreagens Ltda. one: (11) ax (11) arten@arten.com.br