Braking performance early-warning system for hydraulic crane hoisting mechanism

Abstract

The invention discloses a braking performance early-warning system for a hydraulic crane hoisting mechanism. The early-warning system comprises a signal detection device and a warning circuit, and the signal detection device is electrically connected with the warning circuit; the signal detection device comprises multiple detection columns which are installed on one outer end face of a first hoisting machine winding drum, and a proximity switch matched with the corresponding detection column is installed on a winding drum bracket at the outer side of the detection column; and the warning circuit comprises a warning buzzer which is connected with the proximity switches in series, a lifting pressure relay and a falling pressure relay are connected between the proximity switches and a power supply in series, the lifting pressure relay is connected with a lifting control oil circuit of a hoisting machine control oil circuit, and the falling pressure relay is connected with a falling control oil circuit of the hoisting machine control oil circuit. When a braking system is subjected to abnormities, the winding drum rotates, after the detection columns reach the sensing distance to the proximity switches, the proximity switches enable the warning buzzer to be connected with the power supply, and warning is conducted; and an operator can perform maintenance on a crane in time according to warning information, and construction accidents are avoided.

Description

technical field [0001] The invention relates to the technical field of electric cranes, in particular to an alarm system for braking performance of a winch mechanism of a hydraulic crane. Background technique [0002] With the continuous expansion of infrastructure construction scales such as national electric power, petrochemical, steel, and transportation, the role of hoisting machinery, which is the main force of construction machinery, is also becoming increasingly prominent. In order to meet the requirements of different lifting operations, hoisting machinery is constantly being perfected, improved and optimized in terms of type, structure, and performance, and at the same time, it puts forward higher requirements for the safety and reliability of hoisting machinery. [0003] In order to ensure the safety and reliability of the hoisting machinery, although the crane is specially equipped with safety devices to prevent misuse on various working conditions, systems, and m...

AI Technical Summary

Problems solved by technology

If it is not repaired or adjusted in time, it will develop to the point where the reel breaks away from the shackles of the brake pads, and under the action of heavy objects, it will rotate rapidly by itself, forming a state of out of control, such as falling at an overspeed under the influence of gravity acceleration, and damage to the motor or hydraulic pressure in the lighter case. If the motor is heavy, it will cause damage to the whole machine or personal injury or death

[0006]Because the wire rope winding ratio of large-scale hoisting machinery is relatively large, if a slight self-slip occurs, it is reflected that the change of the hoisting or luffing pulley block is very small and difficult to detect. When the abnormality is sensed, it is too late, a free-falling hook has formed, and there is no remedy

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