A hydraulic device for preventing the arm of a hydraulic excavator from falling accidentally

Abstract

The invention discloses a hydraulic device for preventing movable arm of a hydraulic excavator from falling accidently. The device comprises a valve plate, a cartridge valve component and a first pressure measuring unit, wherein the valve plate is arranged on a boom cylinder of the hydraulic excavator, a valve plate inner oil way is processed for the valve plate and comprises a first port and a second port, the first port is communicated with a system oil way of the excavator through a pipeline, the second port is communicated directly with a large cavity of the boom cylinder; the cartridge valve component is arranged on the valve plate, in a communicating connection with a control system of the excavator, communicated with the valve plate inner oil way arranged between the first port and the second port, and connects or disconnects the oil way between the first port and the second port; and the first pressure measuring unit is communicated with the first port and in a communicating connection with the control system of the excavator. According to the device, the cartridge valve component and the first pressure measuring unit are adopted, therefore the device can adapt to high-flow working condition, the cost of construction is low, secondary development is not needed, and the device is easy to maintain.

Description

technical field [0001] The present invention relates to hydraulic excavator booms, and more particularly to mechanisms for preventing accidental drop of hydraulic excavator booms. Background technique [0002] At present, due to safety needs, anti-pipeline rupture valves must be installed in excavators and backhoe loader lifting machines to prevent safety accidents caused by accidental falling of booms during work. [0003] For the small hydraulic excavator system, due to the small flow of the working cylinder, there is a standard pipeline anti-rupture valve that can be selected. Such as figure 1 Shown is a schematic diagram of the principle of the MHRB series product 1 of Bosch Rexroth, Germany. The meaning of each interface in the figure is as follows: [0004] Port A is connected to the control valve of the hydraulic system; [0005] The C port is connected to the oil inlet port of the oil cylinder; [0006] Pp is the control oil port, and the control signal is given...

AI Technical Summary

Problems solved by technology

[0019] 1. Two sets of parts 21 and 22 are used for a single cylinder, the system is complicated, and there is a problem whether the two parts 21 and 22 can be opened synchronously;

[0020] 2. If the remote control pump 23 or the remote solenoid valve 24 itself or the connecting pipeline fails, the boom cannot be placed in a safe position before the fault is rectified, posing a safety hazard

[0021] 3. Due to the use of remote control, it may affect the response speed in occasions that require fast response speed

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