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In the above we have already understood the control principle of the synchronous hydraulic motor and the cause of the error of the synchronous hydraulic motor. In this paper, Dalan Hydraulic will discuss with you the method of solving the error of the synchronous hydraulic motor.
The specific operation method is as follows:
1. Influence of hydraulic system media
1 The hydraulic system medium contains a large amount of gas, especially the newly installed synchronous system. The pipeline exhaust is not complete. The pipeline and the hydraulic actuator contain a large amount of air. The smaller the elastic modulus of the medium, the actual flow through the hydraulic motor. Displacement is affected.
2 Because the compression ratio of air is large, and the hydraulic actuator flows through the oil flow to reach the end point with less air, the hydraulic actuator with large air content in the medium moves relatively slowly, resulting in considerable synchronization error.
2. Select synchronous hydraulic motor with high processing precision
1 The machining accuracy of the synchronous hydraulic motor determines the synchronization accuracy of the hydraulic system.
2 Generally speaking, the synchronous precision of the gear synchronous motor is lower than that of the plunger type. The control precision of the gear synchronous motor is generally ±1%～±2%, and the precision of the plunger synchronous motor can reach ±0.5%～±1. .5%. The accuracy of the components is guaranteed, and the synchronization accuracy of the system can be guaranteed.
3 If the displacement of the synchronous hydraulic motor is the same, the cross-sectional area of ​​the hydraulic actuator is the same, and the synchronization accuracy is greatly improved.
3. Matching of synchronous motor and load
1 The relief valve 1 of the synchronous motor can eliminate the cumulative error, and the pressure setting of the relief valve 1 is also quite critical.
2 Its pressure setting must match the load, the pressure setting is high, and it has an effect on eliminating the synchronization error; if the setting is low, if the load is uneven, the hydraulic cylinder with large load has not yet pushed the load, it has already been 憋In the high pressure and overflow, so that several hydraulic cylinders are up and down, but can not meet the synchronization requirements. Therefore, in the synchronous hydraulic motor synchronous circuit, it should be noted that the load should not be excessively biased, and then the pressure of the relief valve should be properly set.
3 In general, the set pressure of the relief valve 1 is higher than the working pressure of the jacking load cylinder of 20 bar, otherwise the synchronization requirement cannot be achieved. The continuity of the load is also very important. The load that is often not used often starts to be out of sync. Repeating it several times can eliminate the synchronization error. The main reason is that the leakage of the synchronous motor is relatively large, and it is not used for a long time. The hydraulic oil in the mixture is mixed into the air due to leakage, thereby affecting the movement of the hydraulic actuator.
4 When designing, both the pipeline and the hydraulic cylinder should be provided with an exhaust connection.
4. Eliminate the cumulative error of the synchronous hydraulic motor
1 Although the machining accuracy of the synchronous hydraulic motor is high, it may not be exactly the same. The displacement of each motor is also not the same. The displacement is small, always running fast, bigger, always slower.
2 There are other reasons for the synchronization error, such as the uneven load, the design of the hydraulic pipeline is different, and so on, these errors are combined to form the cumulative error of the synchronous control.
3 It can be seen from Fig. 1 that there is a valve block composed of an overflow valve 1 and a check valve 2 on each oil passage inside the synchronous hydraulic motor, and this valve group is set to eliminate the positional unsynchronization error. A synchronous hydraulic motor generally controls several hydraulic actuators. Because of the existence of synchronization error, one of the hydraulic cylinders must first reach the end point. At this time, the position detecting component sends a signal to inform the system that the hydraulic control valve stops, and the remaining hydraulic cylinders. It also stops running and can't reach the end point, so it can't meet the process requirements. If all the hydraulic cylinders are to reach the end point, the motor of the hydraulic cylinder that first arrives at the end point is driven by the same shaft as other motors to continue to supply oil. Therefore, the pressure rises until the overflow valve overflows, achieving synchronization.
4 At the same time, the check valve 2 can also replenish the oil to the synchronous oil passage, so that the overflow valve overflows more, and the one-way valve is less oil-filled, so that the synchronization requirement of the hydraulic actuator can be realized. It can be seen that in the hydraulic cylinder respectively moving to the end point, increasing the delay control, the synchronization error of each step can be eliminated, so that when all the hydraulic cylinders complete their own stroke, the cumulative error of the synchronous motor can be eliminated.
5. Arrangement of synchronous hydraulic motor piping.
1 The piping arrangement of the synchronous hydraulic motor outlet to the hydraulic actuator must be reasonable, otherwise it will affect its synchronization accuracy.
2 The pressure loss of the pipeline is relatively large. When this pressure loss is superimposed on the load offset, a large pressure difference will be generated in the pipeline. If the pressure difference between the inlet and outlet of the hydraulic motor varies greatly, Then at the same speed, the displacement of the hydraulic motor changes.
3 When designing the hydraulic synchronous motor piping, we should arrange the pipeline distance, the bend form, the pipe diameter and the like as well as possible.
4 Hydraulic piping design and construction should pay attention to the exhaust, especially the newly installed, repaired and long-time non-working hydraulic pipeline should pay attention to the exhaust is sufficient.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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