Emergency hydraulic system

Abstract

The invention provides an emergency hydraulic system, the emergency hydraulic system comprises a hydraulic control system, the hydraulic control system comprises a hydraulic main system and a hydraulic emergency system, the hydraulic main system 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 ballvalve, an ascending oil way AWA port, a descending oil way AWB port, an oil tank oil port and a brake oil way EMP port, the ascending 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 port, the power output end of the hydraulic motor is connected with the winch, the hydraulic brake isconnected with the output end of the hydraulic motor in a clamped mode, the first ball valve is connected between the hydraulic motor and the brake oil way EMP port in a normally-closed mode, and thebalance valve is connected between the hydraulic motor and the ascending oil way AWA port. The emergency hydraulic system has the advantages of safety and stability in emergency operation and sufficient braking force.

Description

technical field [0001] The invention relates to the technical field of cranes, in particular to an emergency hydraulic system. 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; The high-pressure oil in the road is unloaded, however, due to the influence of back pressure when the hook lifts or descends the oil circuit to relieve pressure, there will be a certain back pressure at the brake oil inlet, thereby reducing the braking force. [0003] In addition, when the crane loses power or the power device fails due to some unc...

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, thus causing the winch brake to vibrate. 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 unloaded, but due to the influence of back pressure when the hook is lifted or lowered, there will be a certain back pressure at the oil inlet of the brake, thereby reducing the braking force

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