The central function characteristics and application precautions of the reversing valve of CNC hydraulic press?
1. Plan the middle function of the slide valve into the unloading circuit to achieve energy saving. When the reversing valve of the three-position CNC hydraulic press with the middle function of the slide valve is in the middle position, the oil output of the pump is directly returned to the tank, forming the unloading circuit, which can make the pump move in the condition of no-load or small output power, and then complete the energy saving. This method is relatively simple, but is not suitable for systems where a pump drives two or more performance elements.
2. The medium function of the slide valve is planned into a braking circuit or locking circuit. In order to stop the moving operation organization in the arbitrary demand of the orientation, and prevent the movement of the middle stop due to external influences, the brake circuit can be selected. The simplest way is to use the reversing valve of the hydraulic press for braking, such as the reversing valve of the hydraulic press whose slide valve function is M or O, which can block its inlet and return oil circuit when it recovers in the middle position, so that the performing element can stop the movement quickly.
3, the use of H-type, Y-type reversal to complete the floating. For example, when the reverse organization of the hydraulic crane is reversed under the load, if the braking is too quick, the inertia force will have a great hydraulic impact, therefore, often choose the reversing valve of the hydraulic press with the function of H or Y type, when the reversing valve of the hydraulic press returns to the middle position, the reversing motor is in the floating condition, and then use the foot brake to make it smoothly stop rolling. When the reversing valve of the M-type and H-type four-way four-way oil press is in the H position, that is, the floating orientation, then the material can be picked down or flat, and the bucket can be lifted and lifted anywhere, that is, the floating is completed; Other such circuits can still smoothly lower the bucket when the system suddenly stops working. The directional valve of the hydraulic press with the function of Y-type slide valve is selected on the directional valve of the hydraulic press with the walking motor of the crawler excavator, which can make the walking motor in the floating state without bearing the braking load during the excavation operation.
4. The selection of the middle function of the reversing valve of the hydraulic press has a very important influence on the reversing speed of the open oscillation hydraulic system of the roller and the oscillation operation function of the roller. Using the reversing valve of the H-type three-position four-way oil press, when the slide valve is in the middle position, the four oil ports of P, T, A and B are connected to form the connecting road. Because of the role of rotating inertia of the vibrator, residual vibration of the oscillating wheel will occur, and then the appearance of the compacted paving layer will be indentation, but this has little effect on the compaction of the root layer of the oscillating roller for the roadbed, but also reduces the hydraulic impact of the system. For the oscillating roller of the compressed road surface, it is required that when the vibration is stopped or the amplitude is changed during the compaction operation, the excisher can nimbly stop the rotation within 1.5-1.7s to prevent the instantaneous residual vibration from indenting the compaction surface, which affects the compaction quality. Often choose the reversing valve of the M-type three-way four-way oil press, when the spool is in the middle, the two operating oil ports of A and B can produce a large back pressure, promote the motor to overcome the inertia torque of the shaker and quickly stop rotating, so as to prevent the real-time indent of the road pressure, but it will form a high instantaneous pressure peak in the motor circuit. Improve motor and other related components damage rate. Therefore, two relief valves are usually set up at the A and B oil ports of the reversing valve of the hydraulic press to maintain the system.
