Crane overspeed protection method and system
An overspeed protection and crane technology, which is applied in transportation and packaging, load suspension components, safety devices, etc., can solve problems such as poor reliability, and achieve the effects of improving reliability, safe and reliable overspeed protection, and avoiding rotor speed overspeed
Active Publication Date: 2020-09-08
河南巨人起重机集团有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a crane overspeed protection method and system for solving the problem of poor reliability of existing crane overspeed protection strategies
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[0058] Example of crane overspeed protection method:
[0059] This embodiment provides a crane overspeed protection method, and the hardware control device corresponding to the crane overspeed protection method is a controller in a crane control system. Such asfigure 1 As shown, the crane overspeed protection methods include:
[0060] Step S1: Get the stator side parameters of the crane motor:
[0061] Typically, crane motors are three-phase AC asynchronous motors. The parameters on the stator side of the crane motor are obtained. As a specific implementation manner, the obtained parameters on the stator side include the number of poles, frequency and slip. It should be understood that these three parameters are all known parameters.
[0062] Step S2: Calculate the rotor speed of the crane motor according to the stator side parameters:
[0063] According to the obtained number of poles, frequency and slip, and the following calculation formula, the rotor speed of the crane...
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The invention relates to a crane overspeed protection method and system. The method comprises the steps that the rotor rotating speed larger than or equal to a preset overspeed threshold value withina preset time period is obtained, the average value of the rotor rotating speed is obtained through calculation, the overspeed percentage is obtained according to the average value and the preset overspeed threshold value, the target frequency down-regulation percentage is finally determined according to the overspeed percentage, the corresponding relation between the preset rotor overspeed percentage interval and the overspeed grade and the corresponding relation between the preset overspeed grade and the frequency down-regulation percentage of a crane frequency converter, and the crane frequency converter is regulated according to the target frequency down-regulation percentage. Due to the fact that the frequency and the rotor rotating speed are in direct proportion, the rotor rotating speed can be regulated downwards through frequency down-regulation, overspeed of the rotor rotating speed is avoided, and crane overspeed protection is achieved. Compared with an existing crane overspeed protection strategy, the crane overspeed protection manner can achieve safe and reliable overspeed protection, and therefore the reliability of crane overspeed protection is improved.
Description
technical field [0001] The invention relates to a crane overspeed protection method and system. Background technique [0002] A crane refers to a multi-action hoisting machine that vertically lifts and horizontally transports heavy objects within a certain range, also known as a crane, aerial crane, crane, etc. Cranes have been developed and used extensively over time. Since the weight of the items lifted or carried by the crane is usually relatively large, whether the operation safety of the crane is important. If the motor speed of the crane is too fast, it will not only affect the service life of the crane, but also may cause safety accidents. Therefore, the monitoring of the motor speed of the crane plays an important role in the safe operation of the crane. At present, the overspeed detection and protection of the crane still adopts the conventional encoder detection and protection method. The encoder is relatively susceptible to external interference, and the failur...
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IPC IPC(8): B66C15/00B66C13/22
CPCB66C15/00B66C13/22
Inventor 张伟韩召朋孙世普刘文明翟景运李先阳杨克华
Owner 河南巨人起重机集团有限公司