Arm falling safe control system for engineering machinery and hanging arm of engineering machinery

Abstract

The invention relates to an arm falling safe control system for a hanging arm. The arm falling safe control system comprises an amplitude variation balance valve, an amplitude variation oil cylinder, a reversing valve and a hydraulic control handle, wherein the amplitude variation balance valve is connected between the amplitude variation oil cylinder and the reversing valve, the hydraulic control handle is connected with the amplitude variation balance valve, the opening degree of a valve core of the amplitude variation balance valve is controlled through the starting pressure provided by the hydraulic control handle, the arm falling safe control system also comprises an electric proportion overflow valve and a vehicle detection system, a bypass of the electric proportion overflow valve is arranged on a pressure opening control branch, the vehicle detection system detects the extending length of the hanging arm, when the vehicle detection system detects that the arm falling is carried out under the dangerous length work conditions that the hanging arm extends to a certain length, the vehicle detection system provides electric signals for the electric proportion overflow valve, and the electric proportion overflow valve automatically reduces the opening pressure exerted on the amplitude variation balance valve to a safe pressure value.

Description

technical field [0001] The invention relates to construction machinery, in particular to a safety control system for construction machinery and its boom drop, which further ensures the safety of the construction machinery when the boom is drop. Background technique [0002] In construction machinery, especially in crane machinery, the drop arm of the boom is a dangerous working condition, especially in the working conditions of medium and long arms, full extension boom, and full extension boom plus jib, the drop arm of the boom is very Dangerous working conditions, because the boom is very long, if the luffing cylinder is lowered a little, the head of the boom will move a very large distance. Therefore, in the above three working conditions, special attention should be paid to the lowering of the boom, and the lowering of the boom must be slow. However, in crane machinery, especially for large-tonnage products, if the control system is a hydraulic control system, the operat...

AI Technical Summary

Problems solved by technology

However, in crane machinery, especially for large-tonnage products, if the control system is a hydraulic control system, the operators of the above three working conditions must pay special attention to prevent the handle from being opened too much, which will cause the boom to be lowered too fast and the suspended object will move too fast.

If the operator is negligent, or the operator is not experienced enough to control the handle well, it is very likely that the installed object will smash the mounting seat, damage the suspended object, hurt the ground installation personnel, and cause a serious hoisting accident.

[0003] For the existing hydraulic control engineering machinery, especially the drop arm system of the boom of the large-tonnage crane, the operator needs to be very careful to control the handle when working in the above three working conditions, so as to prevent the handle from being opened too much. safety incident

In order to prevent these accidents, it is necessary to rely on the operator to grasp it based on experience. The operation is difficult. Once a novice operates, accidents are likely to occur.

In addition, in the existing technology, the system cannot make safety protection measures according to the actual length of the boom in the long boom, full extension boom, and full extension boom plus jib working conditions, which is not conducive to hoisting safety, and Higher experience requirements for operators

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