An anti-tilt safety control device for crane jib

Abstract

The invention discloses a safety control device for anti-backward tilting of a crane jib, comprising a display, a controller, an angle sensor, a low-pressure alarm pressure switch, and a high-voltage alarm pressure switch; Compared with the setting value of the tilt limit position, a limit position limit signal is sent to stop the oil cylinder from retracting; the display is used to receive the anti-backward length signal sent by the controller, display it in real time on the display, and set it in the display Set a pre-alarm range for anti-backward limit, and when the anti-backward length reaches this range, an alarm window will pop up to remind the operator. The invention avoids the problem of inaccurate data display caused by signal interference; improves the generality and operation convenience of the detection of the limit position of anti-backward tilt; increases the pre-alarm function of the limit position of anti-backward tilt; improves the accuracy and accuracy of the entire anti-backward tilt safety control system. Reliability; reduce the cost of the anti-roll safety control system.

Description

technical field [0001] The invention relates to a safety control device, in particular to a safety control device for anti-back tilting of a crane jib. Background technique [0002] During the hoisting process of the crane, it is often necessary to adjust the amplitude of the jib and pull the jib to a certain angle. When the angle is too large due to improper operation or other factors, the amplitude limit switch of the primary protection device will work to limit the start of the luffing. Action, when the amplitude limit switch fails or suddenly tilts backward in special circumstances, the anti-backward device of the secondary protection device will work, so that the boom, luffing wire rope and its accessories are in a stable state, preventing lifting The arm continues to lean back, causing the center of gravity of the whole crane to deviate from the stable state, resulting in instability and tipping, which protects the safety of life and property. Therefore, how to safely...

AI Technical Summary

Problems solved by technology

[0004] The existing anti-backward safety control device has the following disadvantages: 1. The pressure sensor is an analog quantity, and its signal is easily interfered by other factors, resulting in inaccurate or jumping pressure values ​​and poor stability; The detection distance is limited. For different anti-backward oil cylinders, the proximity switches selected may be different, which increases the types of proximity switches and increases the misassembly rate on site; It is not easy to adjust when it is not suitable, and the degree of generalization of different anti-backward cylinders is not high, which reduces the mass production rate; 4. When the proximity switch detects that the anti-backward has reached the limit position, it will send an alarm signal to the operator to remind them that they cannot Raise the arm again, so as not to damage the anti-backward oil cylinder. It lacks an early warning mechanism when it is about to reach the limit position to remind the operator to operate slowly; 5. The existing anti-backward safety control device needs to use two proximity switches. and two pressure sensors, costly

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