A hydraulic brake valve

Abstract

The invention provides a hydraulic brake valve, which includes 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, an AWA port of a lifting oil circuit, and a descending oil circuit AWB port, fuel tank oil circuit AWL port and brake oil circuit EMP port; lifting oil circuit AWA port is connected to the oil inlet port of the balance valve, and the oil outlet port of the balance valve is connected to one end of the hydraulic motor, and the descending oil circuit AWB port and the brake oil circuit The EMP port is connected to the other end of the hydraulic motor in parallel, the oil return port of the hydraulic motor is connected to the AWL port of the fuel tank oil circuit, the power output end of the hydraulic motor is connected to the winch, the hydraulic brake clamp is connected to the output end of the hydraulic motor, and the first ball valve is normally closed. Between the hydraulic motor and the EMP port of the brake oil circuit, the balance valve is connected between the hydraulic motor and the AWA port of the lifting oil circuit; the first input end of the shuttle valve is connected to the AWA port of the lifting oil circuit, and the second input end of the shuttle valve Connect to the AWB port of the descending oil circuit. The invention has the advantages of high braking safety and sufficient braking 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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