1、 Brief description:
QJM radial ball plug type Low speed high torque hydraulic motor , won the second prize of research achievements of Zhejiang Science Conference. It can be matched with various hydraulic oil pumps, valves and hydraulic accessories Hydraulic transmission device Because its appearance design adopts various countermeasures, it can meet the working conditions of various equipment. This type Hydraulic motor It has a series of advantages, such as light weight, small size, large speed range, stepwise variable, automatic opening and closing of equipment brake, good low-speed stability, reliable operation, shock resistance, high efficiency, long service life, etc. At present, it has been widely used in construction engineering, hoisting and transportation, metallurgical industry super heavy, crude oil, coal mining, shipbuilding, machine tools, light industry injection molding, geological exploration and other departments. It can directly drive crawler walking, track wheel driving, various rotary lifting equipment, survey drilling, belt conveyor, raw material mixing, road cutting, ship manufacturing driving, plastic pre molding and other institutions.
2、 Main features:
1. The rolling element of this type of hydraulic motor is replaced by -. only steel ball Inner curve hydraulic motor More than two rollers and beams are used, so the structure is compact, the operation is reliable, and the volume and weight are significantly reduced.
2. The inertia of the motion pair is small, and the steel ball is firm and reliable, so this type of hydraulic motor can operate continuously under high speed and impact load.
3. There are few friction pairs, the internal force of the oil distribution shaft and the rotor is balanced, the ball plug is made of self-lubricating composite materials, and the ball pad transmits force. It has the conditions of static pressure balance and excellent lubrication. The soft plastic piston ring that can automatically compensate for wear is used to seal high-pressure oil, so it has high equipment and capacity efficiency, can operate stably at a very low rotational speed, and has a large starting torque.
4. Due to the characteristics of the structure, the hydraulic motor needs a relatively low oil return back pressure, usually 0.30.8MPa. The higher the rotation speed, the greater the back pressure.
5. Because the oil distribution shaft is rigidly connected with the stator, the oil inlet and outlet pipes of this type of hydraulic motor can be connected with steel pipes.
6. This type of hydraulic motor has two-stage and three-stage variable displacement, so it has a relatively large speed range.
7. Compact structure, convenient disassembly, no special requirements for cleanliness, and the oil filtration precision can be selected according to the requirements of the matching hydraulic oil pump.
8. Except for the shell type and the supported type, the outlet shaft of the hydraulic motor can usually only bear the torque, and cannot bear the radial and axial external forces.
9. With a "T" type hydraulic motor, the center has a through hole, and the transmission shaft can cross the hydraulic motor.
10. The hydraulic motor with "S" type is equipped with a mechanical brake that can be automatically opened and closed, which can achieve reliable braking.
11. With "Se *" and "SeZ" hydraulic motors, the starting and braking can be controlled manually or automatically. The regulating pressure is relatively low, the braking torque is large, and the operation is simple and reliable.
4、 Construction principle of basic shaft rotating hydraulic motor:
The oil distribution shaft of QJM type hydraulic motor is rigidly connected with the rear cover plate. The rotor body is radially supported by the oil distribution shaft, and the stator ball raceway and steel ball are used as shaft supports. The rotor output shaft is an internal spline. It is specified that the driving shaft of the working mechanism is loose and cooperates with it, so the rotor body is variable and the oil distribution shaft is rigid, so it is allowed to connect the oil inlet and outlet with steel pipes. The pressure oil is distributed to the oil distribution window of each high-pressure chamber through the channel (or speed change valve) in the oil distribution shaft and enters into each piston cylinder hole. Under the action of pressure oil, the piston acts on the stator with positive pressure N through the steel ball, and the stator acts on the steel ball with the same counter impulse N '. N is decomposed into two components: radial force and tangential force. The radial force is balanced by oil pressure. The tangential force F acts on the rotor body through the piston. In this way, the rotor body rotates around the oil distribution shaft under the drive of F force. Since several pistons are under the action of pressure oil in the same instant, a large torque can be formed. When the piston rotates with the rotor body to the end point of the stator surface, the piston returns to the shaft center driven by the stator surface, and the working oil in the piston cylinder is discharged back to the low-pressure flow channel through the oil distribution rotating window. In this way, the task of converting pressure energy into mechanical kinetic energy is realized, and the hydraulic motor continues to rotate. Changing the oil flow direction of the two oil ports can make the reverse rotation. The rotation speed can be changed by changing the flow into the hydraulic motor to achieve the goal of stepless speed regulation. Graded Variable hydraulic motor The displacement is changed by changing the position of the speed change valve installed in the oil distribution shaft of the hydraulic motor. The position of variable speed valve is adjusted by manual mechanism or pilot valve.
