Drag the pump valve system to the weak treatment

The main hydraulic cylinder driven by the main concrete cylinder reciprocating linear motion is the main movement of the concrete from the "suction" or "squeeze" effect; S tube valve swing to the auxiliary movement, close cooperation with the main hydraulic cylinder The main hydraulic cylinder and S-pipe valve are basically two hydraulic systems, controlled by their own pumps and valves, sharing only one hydraulic tank and one engine. Pivot valve switching action is followed by the main hydraulic cylinder reversing action, that is, the swing valve commutation frequency depends on the main cylinder of the movement frequency. Solenoid valve system can not be caused by the reversal of the action is not easy, swing is not in place, resulting in the main concrete cylinder suction, extrusion efficiency, affecting the normal use.
　　
The airbag accumulator in the towing pump is "co-fueling with the pump in some intermittent hydraulic circuit" to reduce the required displacement of the hydraulic pump so as to greatly reduce the power, volume and cost of the pump used, and at the same time, Reduce energy consumption.
　　
Under the premise of a certain capacity of the accumulator and a certain working pressure of the hydraulic circuit, the only variable parameter to increase the pressure oil reserves of the accumulator is the initial inflation pressure Po of the accumulator. Suppose Po decreases, then in the accumulator oil and gas have reached the working pressure, the pressure of oil into more, so Po down the amount of oil reserves increased.
　　
Some repair technicians believe that the swing valve system is weak to the valve pressure adjustment problems, repeatedly disassemble, adjust the swing valve system to change the pressure control valve has never solved the problem. Further analysis of the phenomenon of failure that this is not a valve problem, because the initial pressure value can reach 20MPa, indicating that the valve is basically normal, the pressure drop is too large when the swing is the flow problem is the swing valve system pressure compensation capacity is not enough, or is the valve The efficiency of the hydraulic pump is reduced or the amount of oil in the accumulator reserve pressure oil is insufficient (relative to the S-cylinder swing cylinder's needs). Accumulators should be the primary focus of suspicion because of the symptoms that occur after the accumulator has been replaced and the inflation pressure has been adjusted. Asked the driver on the ground, saying that the original accumulator balloon broken, for the accumulator. As the accumulator capacity changes, inflation pressure will have to change; even if the same capacity, inflation pressure is also different. According to the working principle of the accumulator, a proper deflating method is adopted to reduce the inflation pressure of the accumulator, which solves this problem.

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