Hydraulic brake valve

Abstract

The invention provides a hydraulic brake valve. The hydraulic brake valve comprises a winch, a hydraulic brake, a hydraulic motor, a shuttle valve, a balance valve, a first reversing valve, a second reversing valve, a first ball valve, a lifting oil way AWA port, a descending oil way AWB port, an oil tank oil way AWL port and a brake oil way EMP port, wherein the lifting oil way AWA port is connected with an oil inlet of the balance valve; an oil outlet of the balance valve is connected with one end of the hydraulic motor; the descending oil way AWB port and the brake oil way EMP port are connected with the other end of the hydraulic motor in parallel; an oil return port of the hydraulic motor is connected with the oil tank oil way AWL port; a power output end of the hydraulic motor is connected with the winch; the hydraulic brake is connected with an output end of the hydraulic motor in a clamping manner; the first ball valve is normally closed and connected between the hydraulic motor and the brake oil way EMP port; the balance valve is connected between the hydraulic motor and the lifting oil way AWA port; a first input end of the shuttle valve is connected with the lifting oilway AWA port; and a second input end of the shuttle valve is connected with the descending oil way AWB port. The hydraulic brake valve has the advantages of high brake safety and sufficient brake force.

Description

technical field [0001] The invention relates to the field of crane machinery, in particular to a hydraulic brake valve. Background technique [0002] In the traditional crane winch, when the winch moves, when the brake is released and the hook is raised or lowered, the brake will not be fully opened due to insufficient pressure in the brake hydraulic oil circuit, resulting in brake vibration of the winch. In this way, There is a risk of insufficient pressure in the brake hydraulic oil circuit causing the winch to brake again. Once a sudden brake occurs during the lifting of the hook, it may cause the cargo to be unhooked; However, due to the influence of back pressure when the hook lifts or lowers the oil circuit to release pressure, there will be a certain back pressure at the brake oil inlet, thereby reducing the braking force. Contents of the invention [0003] The present invention provides a hydraulic brake valve with good braking stability and sufficient braking for...

AI Technical Summary

Problems solved by technology

[0002] In the traditional crane winch, when the winch moves, when the brake is released and the hook is raised or lowered, the brake will not be fully opened due to insufficient pressure in the brake hydraulic oil circuit, resulting in brake vibration of the winch. In this way, There is a risk of insufficient pressure in the brake hydraulic oil circuit causing the winch to brake again. Once a sudden brake occurs during the lifting of the hook, it may cause the cargo to be unhooked; The high-pressure oil in the road is released, but due to the influence of back pressure when the hook lifts or lowers the oil circuit to release pressure, there will be a certain back pressure at the brake oil inlet, thereby reducing the braking force.

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