Products Torque LimitersEnclosed Wet Brakes HPTO Diesel Engine Clutches Caliper Disc Brakes for Steel Mills Combination Gearbox/BrakeOverrunning Clutch CouplingsResourcesFind RepLiteratureVideoPTT China Articles
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Tire Shredder
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Situation A slow speed tire shredder is particularly prone to inertia shockloads due to the high reduction ratio in its gearbox.
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Problem The cutting drums in a shredder rotate towards each other. If metal falls into the shredder, it can be wedged between the drum causing a sudden stop. The motor and pulleys equivalent inertia at the cutting drums increases by the square of the gearbox ratio. This means even a small motor can have a devastating effect on the shredder.
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SLQ Series
 Single disc with torque to 2,096 lb-ft Accepts Renold Hi-Tec rubber coupling for shaft to shaft installations Accepts sprockets or pulleys for parallel shaft installations Shaft mounted using QD bushings
| Performance Chart |
Motor
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Nema B - AC Motor |
| Horsepower |
60 HP |
| Peak Engine Torque |
356 lb-ft |
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Belt Ratio |
4:1 |
| Torque Setting |
20% lb-ft |
| Torque Limiter |
SLQ Series | |
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Solution The driven pulley is mounted onto the SLQ and the SLQ is mounted on the input of the gearbox. This isolates the motor/pulley inertia thus protecting the shredder during a jam.
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Auxiliary Drives
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Situation Customers need a reliable system to remain connected to the drive but allow quick engagement of the backup. Repairs are often difficult when the drives must be moved to work on the couplings.
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Problem Many pieces of large industrial equipment require auxiliary drives to back up the main drive in case of failure or maintenance. Some applications require slow speed drives for non-production days.
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SGK Clutch Couplings

| Performance Chart |
Torque Rating
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200-18,000 |
| Max Bores (O/R) |
2.25-6.75" |
| Max Bores (Driver) |
1.87-6.50" |
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Max Overrunning RPM |
2800-1350 RPM | |
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Solution By combining sprag-type over-running clutches to gearcouplings, the result is the best combination of torque capability to bore capacity of any over-running clutch coupling because the unit does not have to be over-sized to accommodate the bore requirements. The center section on an SGK drops out, allowing for ease of repair to the drive system.
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Kiln Drives
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Situation Uncontrolled rollback presents a significant danger to personnel and equipment because it can lead to a centrifugal explosion of drive components. Kilns need a safety devise capable of handling this extreme energy safely and reliably.
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Problem
Inexperienced operators can damage manual clutches while starting machine. The small pilot bearings have a short service life and transfer belt-load into the engine crankshaft.
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KDK Kiln Drive Couplings

| Performance Chart |
HP Rating
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7.4-150 |
| Max Overrunning RPM |
1150-2200 RPM |
| Energy Capacity |
650,000-3,000,000 ft-lb | |
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Solution By combining sprag-type over-running clutches to gearcouplings and a fluid coupling, a compact solution is found. The high energy capacity and the torque characteristics of the unit make it ideal. The retarding torque increases exponentially as the speed increases. At the end of the rollback, oscillation and forward roll is completely eliminated.
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Downhill Conveyor Brakes
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Situation Conveyor systems are used for mining applications for bulk material handling. These systems are designed to run down significant grades and creating high energies while braking.
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Problem Conveyor systems are getting longer and carrying higher loads. Brakes are needed for standard dynamic braking and holding brakes. When a stop is needed, the brake cannot stop abruptly or the belt may be damaged or the material will be thrown down the belt, causing a pileup.
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PTT-481-0 Wet Brake 
PTT-483-0 Caliper Disc Brake 
- Standard torques from 20,000 lb ft to 400,000 lb ft
- Scalable for a variety of torque requirements
- Custom engineering for your application
- Wear indicator built in
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Solution PT Tech has multiple packages in service for Downhill applications. The designs can incorporate a wet brake or a caliper disc brake system. PT Tech designs a control system specific to your application. The system includes the brakes, hydraulic controls and an electronic control panel, therefore offering a package solution. These controls allow for braking that is applied in an adjustable manner, allowing for greater safety.
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