The pneumatic winch has the advantages of compact design, convenient use, safe and reliable operation, and can realize stepless speed change. As a fire-proof, explosion-proof and dust-proof traction power device, it is especially suitable for oil drilling platform, pipeline laying, equipment hoisting, underground mining and other flammable and explosive places or polar environment.
1. Structure and composition of piston type pneumatic winch
The Pneumatic Winch uses the five cylinder piston type pneumatic motor as the driving force, and drives the winch to rotate through the two-stage gear reducer, so as to realize the lifting and lowering of the load, which is mainly composed of the piston type pneumatic motor, rotation system, braking system, drum and support.
Structure of pneumatic winch
2. Transmission system of pneumatic winch
The transmission device of pneumatic winch is the power output part of the whole equipment, mainly composed of transmission shaft, drum, reduction gear
Brake hub and drum bracket are composed as shown in Figure 2-7. When the piston type pneumatic motor works normally under the rated pressure,
Generally, the output speed is 250-1500r / min and the power is 0.1-50kw. The speed must be reduced before the power output. The reduction ratio of the transmission system of the pneumatic winch is 20.5. The crankshaft of the motor drives the gear, and the two-stage gear drives the drum of the winch to rotate after the reduction. The transmission system is at the other end supported by the drum, one end of the transmission shaft is connected with the motor crankshaft, the other end is connected with the reduction gear, and the reducer is composed of an external meshing gear and a pair of internal meshing gears. The brake hub is fixedly connected with the drum, and is fixed on the winch bracket by the drum support.
Transmission system structure of pneumatic winch
3. Brake system of pneumatic winch
The winch braking system is composed of cylinder braking and manual braking, which work independently and do not interfere with each other.
The air cylinder brake is composed of brake belt, steel belt and self reset air cylinder. The brake belt is fixed on the inner side of the steel belt, and the steel belt is wrapped on the outer side of the brake hub of the winch. One end of the steel belt is fixed on the winch bracket, and the other end is connected with the piston of the cylinder. By tightening the nut to adjust the tightness between the brake belt and the brake hub, the brake force of different sizes can be obtained. When the winch starts to operate, the compressed gas enters the cylinder, contracts the piston rod, so that the brake steel belt and the brake belt loosen the brake hub in turn, at this time, the cylinder can rotate freely; when the air pressure is too low or the air is cut off, the pressure of the compressed gas in the cylinder drops because There is a self return spring in the cylinder to tighten the brake belt and complete the brake.
Foot brake is mainly composed of brake belt, steel belt, pedal and other structures. Its principle is the same as that of air cylinder brake. The difference is that when the foot brake is not working, the brake belt releases the brake hub. When the pedal is touched, the brake belt and the brake hub are locked, and the brake force increases with the increase of the pedal contact force. The foot brake is mainly used to stop the winch temporarily when the lifting weight rises or falls, that is, the winch can be braked without operating the air distribution valve; when the air distribution valve does not work, the weight still rises or falls, and the emergency brake can be realized by touching the brake.