A hydraulic power compensation balance valve

Abstract

The invention discloses a hydraulic power compensation balance valve. The pilot control end cover assembly includes a control end cover valve body, and a pilot oil channel is arranged on the control end cover valve body; the valve core assembly includes a throttle valve core, a main spring, a regulating valve Seat; one-way valve seat assembly includes one-way valve and one-way valve spring; balance valve body assembly includes balance valve body and valve seat; throttle valve core is provided with a throttle port with an angle of α; the inner wall of the right end of the one-way valve The conical surface and the conical surface of the throttle port of the throttle spool cooperate with each other to form an openable seal; the one-way valve moves to the left during the luffing operation to realize the function of the one-way valve from the oil port A to the oil port B of the balance valve. During the luffing operation, the throttle spool opens to the right under the action of the pilot control pressure to realize the balance valve function from oil port B to oil port A, and as the load pressure increases, the angle through the throttle spool is α The hydraulic force generated during the annular flow channel controls the size of the throttle opening of the throttle spool to achieve load-flow compensation.

Description

technical field [0001] The invention belongs to the technical field of construction machinery and relates to a hydraulic power compensation balance valve. Background technique [0002] When the hydraulic system of construction machinery is working, if the load of the hydraulic cylinder is a vertical and horizontal load, and the direction of movement and gravity are consistent with the direction of the force, a balance valve must be used to generate oil flow resistance on the circuit to prevent the movement from losing control. Especially in the luffing system of the crane, the requirements for the balance valve are higher. The load moment arm increases due to the change of the luffing drop angle, and at the same time, the increase of the load pressure causes the luffing drop speed to become faster and faster, which is likely to cause safety accidents. Therefore, It is necessary to design a compensation function for the luffing balance valve that can effectively suppress the ...

AI Technical Summary

Problems solved by technology

[0004] The prior art has the following defects: (1) The existing balance valve with overcompensation function used in the hydraulic system of construction machinery is equipped with an overcompensation damping structure through the pilot valve core, which has complex structure, large volume and high cost;

[0005] (2) After the overcompensation function is added to the balance valve used in the hydraulic system of construction machinery, the balance valve has many sealing points, increases leakage points, and is difficult to process

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