This combination consists of motor, reducer, transmission drum, hydraulic coupling, brake, backstop, etc.
Motor:
The belt conveyor of coal conveying system generally adopts Y-series due to poor environmental conditions
Column three-phase asynchronous motor. Safe closed fan cooled squirrel cage three-phase induction motor is the latest series of unified design in China. It has the advantages of high efficiency, energy saving, large starting torque, good performance, low noise, low vibration, high reliability, power grade and installation size in line with IEC standards, and convenient use and maintenance.
Coupling:
A mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms to rotate together to transmit torque. The common coupling of the driving device of belt conveyor is elastic coupling, which not only transmits torque, but also absorbs vibration. Ability to mitigate impact.High speed couplings include: elastic pin coupling, nylon pin coupling, plum disc coupling and hydraulic coupling.
The couplings of low-speed shaft drive include: cross slider coupling and gear coupling.
Hydraulic coupling
- Structure of hydraulic coupling: it is composed of pump wheel, turbine, working medium, etc.
- Function of hydraulic coupling: a non rigid coupling with liquid as the working medium is used to connect the motor shaft and reducer shaft (driving shaft and driven shaft) in the driving device to rotate together to transmit torque.
3.Working principle of hydraulic coupler:
When the motor is running, it drives the shell of the hydraulic coupler and the pump wheel to rotate together, and the hydraulic oil in the pump wheel blade rotates together driven by the pump wheel. Under the action of centrifugal force, the hydraulic oil is thrown to the outer edge of the pump wheel blade and rushes to the turbine blade at the outer edge, so that the turbine rotates under the impact of the hydraulic oil, and the hydraulic oil rushing to the turbine blade flows along the inner edge of the turbine blade and returns to the inner edge of the pump wheel, Then it is thrown to the outer edge again by the pump wheel. In this way, the hydraulic oil flows from the pump wheel to the turbine, and then returns from the turbine to the pump wheel to form a circulating fluid flow. When the circulating hydraulic oil in the hydraulic coupling flows from the inner edge of the pump wheel blade to the outer edge, the pump wheel works on it, and its speed and kinetic energy gradually increase, while when it flows from the outer edge of the turbine blade to the inner edge, the hydraulic oil works on the turbine, and its speed and kinetic energy gradually decrease. The generation of hydraulic oil circulation flow makes the speed difference between the pump wheel and the turbine, and makes the pressure difference at the outer edge of the blades of the two wheels. When the hydraulic coupling works, the kinetic energy of the motor is transmitted to the hydraulic oil through the pump wheel, and the hydraulic oil transmits the kinetic energy to the turbine for output in the process of circulating flow. In the process of circulating flow, the hydraulic oil is not subjected to any additional external force except the force between the pump wheel and the turbine. According to the principle of equal force and reaction force, the torque of the hydraulic oil acting on the turbine should be equal to the torque of the pump wheel acting on the hydraulic oil, which is the working principle of the hydraulic coupler.
4.Performance characteristics of hydraulic coupler:
The speed regulation range is wide, and zero regulation can be realized.There is no electrical connection, it can work in dangerous places, and it is not strict for environmental requirements. The utility model has the advantages of simple structure, convenient operation and low failure rate. The performance index has low requirements for accuracy and low energy conversion efficiency. The hydraulic oil is replaced regularly after aging.
- The structure of elastic pin gear coupling: it is composed of non-metallic pin, half coupling, outer ring of half coupling and retaining ring.
- Working principle of elastic pin gear coupling: the pin made of several non-metallic materials is placed in the mating hole between the two half couplings and the inner surface of the outer ring, and the two half couplings are connected by transmitting torque through the pin.
- Elastic pin gear coupling has the following characteristics: large transmission torque and return at the same torque
Most of the rotating diameter is smaller than the gear coupling, with small volume and light weight. It can partially replace the gear coupling. Compared with the gear coupling, the utility model has the advantages of simple structure, fewer components, convenient manufacture and no gear processing machine. Convenient maintenance and long service life. Remove the baffle to replace the nylon column pin. The nylon pin is self-lubricating material and does not need lubrication. It not only saves lubricating oil, but also purifies the working environment. The vibration damping kinetic energy is poor and the noise is large. The elastic pin gear coupling has the performance of compensating the relative offset of the two shafts to a certain extent. It is suitable for medium and large power transmission. It is not suitable for the working parts with certain requirements for vibration reduction and strict noise control.
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