Air Tube Disc Clutches and Brakes Typical Applications
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Air Tube Disc Clutches and Brakes Typical Applications Wichita High Torque Clutch provides fast acceleration and long life on metalforming punch presses. Wichita Low Inertia Brakes increase tension control for paper unwind stands. Typical Wichita clutch and brake mounting on a press Wichita Spring-Set Air Release Brakes insure accuracy and high performance for a metal shear. 22 www.wichitaclutch.com P-1100-WC-A4 7/21 Air Tube Disc Clutches and Brakes Application Factors Clutch sizes are affected by the following variables: 1. Machines that operate under smooth 4. Starting torques may be very low max i mum cooling air. In instances where loads require smaller clutches. These compared to the normal torque, this is not pos si ble, forced air cooling machines are driven by either which may result in the clutch not may be nec es sary for extended clutch multi-cylinder high speed engines or being fully pressurized prior to the life. electric motors with reduced starting time of full torque requirement. This 6. Safe clutch operating speeds should be current. will cause the clutch to overheat from maintained in product design. slippage. Clutch inflation time in this 2. Drives that require high starting instance is very important. Maximum Clutch current motors will require clutches Contact Velocity FPM ................. Ma te ri al with sufficient torque to prevent 5. Clutches on most machines are excessive slipping while starting. designed to slip prior to damage 6,000 (Recommended upper limit for slip) ...........cast iron B from shockloads. As a result, the 9,000.......................................... ductile iron 3. Starting torque may be high, which clutch may require periodic 12,000.................................................. steel requires a fast clutch response time main te nance; therefore, the clutch Dynamic balancing recommended when to transmit the required torque; or, should be located for easy access in peripheral speeds exceed 3500 FPM. The extended clutch slip time is required the power train. maximum speeds shown are safe oper at ing to protect the prime mover. Clutch es should also be located for speeds based on years of Wichita testing. Please do not exceed these limits. Application Guidelines This chart gives application factors “Selection Requirements” to complete ranging from light duty (the A group) to the selection process. The infla tion and extra heavy duty (the D group). exhaust time should also be checked to After initial usage is determined, see insure proper response. Field of Application Group A Group B Group C Group D Pumps Centrifugal Reciprocating compressors Reciprocating compressors compressors over 2 cylinders, one or two cylinders centrifugal fans & blowers Agitators Liquid Semi-solid Solids Brick Brick press, extruder, pug mill manufacturing Canning & bottling machine Bottle-can feeders, filling, mixers Engine driven equipment Crane, hoist, engine Crowd Grinding mills Ball-rod-sag-pebble Crushers, shakers Lumber processing Yarder Carriages, conveyers Chipper, logger Marine Propulsion clutch CP wheel Shaft brakes, propulsion reversing type, anchor winch Bulk material Conveyors evenly loaded, Feeders Elevators handling line shaft evenly loaded Metal production & Coilers, slitters, press brake, Draw bench, rolling mill, Hammer mill, forming metalforming non-geared press, geared press shear, back geared press, press, forging press, deep draw press, transfer header press, knuckle press press, toggle press Paper industry dryer Fourdrinier to 500 FPM, Fourdrinier to 1800 RPM sections & calenders paper mill plane & press selections, calenders Consult factory smoothing press & dryers Petroleum Drilling & service rig master Mud pumps, production clutches, compound clutches, PTO clutches rotary, drum Rubber Transfer machines Banberry mixer, drum mixer, Centrifuge manufacturing evenly loaded extruder, calender P-1100-WC-A4 7/21 www.wichitaclutch.com 23 Air Tube Disc Clutches and Brakes Low Inertia and Very Low Inertia Clutches and Brakes Ring Shims Multiple Spud Airtube Very Low Inertia Pressure Drive Plate Assembly Plate with Bonded or Riveted Pads Airtube Floating Plate Holding Plate Hub Ductile Center Plate Grooved Friction Disc Demountable Backplate Roto-Coupling (Optional) Spider Operating Features The Wichita Air-Tube Disc Clutch combines Wichita Low Inertia and Very Low Inertia all the best features of the disc type clutch with Clutches and Brakes are designed to be all the advantages of direct air engagement. com plete ly free from effects of cen trif u gal The simplest and most trouble-free method force and self energization. of applying air pressure is through direct axial Torque developed is in direct proportion to air pressure ap pli ca tion by com pressed air in a pressure ap plied. special com po si tion full-circle tube. These clutches and brakes interface well with Wichita Clutches engage smoothly without automated controls through simple air and/or noise, shock or impact and release complete ly electric circuits. in a fraction of a second. Extremely fast action is possible because of the small volume of air Water cooled, copper disc clutches are re quired. available for use when power transmis sion needs require excessive or constant slipping Clutches may be slipped moderately to control which demands higher heat dis si pa tion. the acceleration rate. Wichita Clutches operate perfectly when When large inertia loads are powered from teamed with Wichita Brakes in produc tion electric motors, smooth, controlled slip starts situations requiring tension control, cyclic by Wichita Clutches can keep power demands duty, or positioning. below the allowed max i mum. Wichita Brakes have the same outstanding Heat generated by controlled slipping or performance characteristics as Wichita high cycle rate operation is dissipated by Clutch es. the cen trif u gal blower design of these units. 24 www.wichitaclutch.com P-1100-WC-A4 7/21 Air Tube Disc Clutches and Brakes Low Inertia and Very Low Inertia Clutches and Brakes Selection Requirements Summary The selection of a Low Inertia Brake is As calculated, the torque required to stop the based on: load in 5 seconds is 14,547 lb.in. Wichita Low Inertia Brakes are rated at 100 PSI. 1. Torque required to stop a load. This application has only 80 PSI available. 2. Friction area necessary to absorb To determine the torque rating of a Low Inertia rotational energy. brake at 80 PSI apply the following formula: 3. Contact velocity of rotating discs. Application: Torque for a Low Inertia Brake 4. Maximum bore capacity of unit. Torque X Catalog Rated Pressure = B Selection example Available Air Pressure To properly select a Low Inertia Brake for 100 = 14,547 X = 18,183 lb.in. a controlled deceleration application, the 80 following information is needed: Speed ...................750 RPM Consult pages 26 and 36 for clutch and brake Shaft Dia. ................5 in. spec i fi ca tions. A Low Inertia model 114 Brake Inertia to Stop.............2,473 lb.ft.2 pro duc es 27,625 lb.in. torque at 100 PSI. Stop Time................5 sec. However, the bore capacity is 4.125 inches. Air Pressure Available ......80 PSI This application requires a 5 inch bore. There fore, a Low Inertia 118 is to be Calculations in ves ti gat ed. WR2 X (RPM)2 Avg. HP = Catalog Torque Rating = 64, 500 lb.in 3.2 x 106 x Stop Time @ 100 PSI Maximum Bore Capacity = 5.25 in. 2,473 X (750)2 = = 87 HP Catalog Swept Friction Area = 264 in.2 3.2 x 106 x 5 sec. Calculations show this application needs at least 202 in.2 to absorb the heat. Swept Avg. HP = All of these ratings are acceptable for the given Friction HP ab sorp tion rate for 5 seconds application data. Area (see page 174) Next, check contact velocity of rotating discs. 87 HP 2 = = 202 in. 0.43 Diameter of center plate X RPM = 3.82 18” X 750 WR2 x RPM = Torque = 3.82 25.5 x Stop Time = 3,534 FPM 2.473 x 750 = Standard material is sufficient up to 6,000 FPM 25.5 x 5 (see page 23). Balancing is recommended above 3,500 FPM. = 14,547 lb.in. Therefore, a Low Inertia ATD-118 brake is Using the above calculations, consult the the optimum choice for this application. Low Inertia Specifications Chart on A Spring-Set Air Release Brake is also pages 26 and 27. available (see page 58). Note: This application example is for prelim i nary sizing only. Contact a Wichita Sales Engineer or the factory for final selection. P-1100-WC-A4 7/21 www.wichitaclutch.com 25 Air Tube Disc Clutches and Brakes Low Inertia Clutches Specifications Model Slip Torque Capacity Duty Factors Max. Bore Size Assembly Drawing lb.in. Nm HP/100 RPM Rect. Key ATD- Number Number 80 PSI 100 PSI 5.5 BAR 7 BAR A B C D in. (mm) LIC 106 6-006-100-211-0 -100-900-9 3,160 3,950 340 435 6.2 4.4 2.2 1.1 2.00 (50) LIC 206 6-006-200-200-0 -200-900-9 6,320 7,900 680 870 12.5 8.8 4.4 2.2 LIC 108 6-008-100-103-0 D-1718 5,600 7,000 620 790 11.1 8 4 2 LIC 208 6-008-200-101-0 -200-900-9 11,200 14,000 1,240 1,580 22.2 16 8 4 2.25 (57) LIC 308 6-008-300-103-0 D-2843 16,800 21,000 1,865 2,375 33.3 24 12 6 LIC 111 6-011-100-102-0 -100-900-9 12,720 15,900 1,400 1,785 25 18 9 5 LIC 211 6-011-200-102-0 -200-900-9 25,440 31,800 2,800 3,570 50 36 18 10 2.50 (64) LIC 311 6-011-300-100-0 B-322 38,160 47,700 4,235 5,390 75 54 27 15 LIC 114 6-014-100-102-0 -100-900-9 22,100 27,625 2,435 3,100 44 31 16 8 LIC 214 6-014-200-104-0 -200-900-9 44,200 55,250 4,870 6,200 88 62 32 16 3.50 (89) LIC 314 6-014-300-100-0 B-329 66,300 82,875 7,355 9,365 132 93 48 24 LIC 116 6-016-100-100-0 D-327 30,270 37,838 3,360 4,275