Protection switching device for lost control of crane and related control method

Abstract

The invention provides a protection switching device for lost control of a crane, which comprises a super-speed module, a super-acceleration module and a switching output module. The super-speed module and the super-acceleration module are connected with the switching output module respectively; the super-speed module is used for measuring the speed of a lifted object and analyzing whether the speed exceeds a preset speed setting value; the super-acceleration module is used for measuring the acceleration of the lifted object and analyzing whether the acceleration exceeds a preset acceleration setting value; and if the speed exceeds the speed setting value and / or the acceleration exceeds the acceleration setting value, the switching output module is started to alarm. The invention also provides a related control method. The protection switching device has the advantages of skilful design, simple structure, low cost, economy and practicability, quick response, safety and reliability, can effectively prevent the lost control of the crane, has the same effect on the potential energy load movement of other crane types such as an obliquely-pulled belt machine and a conveyor, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of a safety protection switch device for moving a potential energy load, in particular to the technical field of a crane safety protection switch device, in particular to a crane runaway protection switch device and a related control method. Background technique [0002] In daily industrial production and people's life, using mechanical equipment to move large objects and bulk goods is a very common motion control. How to effectively protect moving objects from possible out-of-control failures, especially for moving objects with potential energy, such as elevators , Cranes, cable-stayed belt conveyors and conveyors, etc., may appear to slide due to loss of control, making the object continuously accelerate and accumulate a large amount of momentum during the slide, making it difficult to brake and causing serious collision accidents. [0003] The current measuring device for the rotating shaft of the lifting...

AI Technical Summary

Problems solved by technology

[0004] However, after the failure of the potential energy system, the heavy object fell out of control, and the heavy object began to drive the rotation of the system shaft; The falling speed of the object is not high, and the rotation speed of the system shaft is not high, so the overspeed switch cannot recognize that the fault has occurred; When the braking device sends out an alarm signal, the moving speed of the heavy object lifted by the lifting system is extremely high at this time, and the braking torque and energy are both large (kinetic energy is proportional to the square of the speed), and the braking device is often overloaded. However, it is easy to damage and fail. Due to the limitation of the structure, the braking device of some systems can only brake the static load, but the dynamic load mechanism itself cannot satisfy the large impact. At this time, it will lead to major accidents, machine crashes

Therefore, the current lifting system, especially the heavy-duty lifting system, only relies on the safety protection device of the overspeed switch to be defective.

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