An emergency hydraulic system

Abstract

The invention provides an emergency hydraulic system, including a hydraulic control system, the hydraulic control system includes a hydraulic main system and a hydraulic emergency system, the hydraulic main system includes a winch, a hydraulic brake, a hydraulic motor, a shuttle valve, a balance valve, a first reversing valve, the second reversing valve, the first ball valve, the AWA port of the lifting oil circuit, the AWB port of the descending oil circuit, the fuel tank oil port and the EMP port of the brake oil circuit; the AWA port of the lifting oil circuit is connected to the oil inlet port of the balance valve, and the balance The oil outlet of the valve is connected to one end of the hydraulic motor, the AWB port of the descending oil circuit and the EMP port of the brake oil circuit are connected in parallel to the other end of the hydraulic motor, the oil return port of the hydraulic motor is connected to the oil port of the fuel tank, and the power output end of the hydraulic motor is connected to the winch , the hydraulic brake is clamped and connected to the output end of the hydraulic motor, the first ball valve is normally closed and connected between the hydraulic motor and the EMP port of the brake oil circuit, and the balance valve is connected between the hydraulic motor and the AWA port of the lifting oil circuit. The invention has the advantages of safe and stable 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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