| This article summarizes the large forging crane hoisting mechanism is introduced into a new kind of electrical control technology, the following control technology. It depends on the currently large forging cranes increased use of the frequency converter drive and PLC control.Precise torque control by the frequency converter and PLC logic computing power. As a kind of changing the forging crane hoisting mechanism control method of new technology.This technology can effectively remove in the large process by hydraulic press, hydraulic press for the huge impact for the threat of forging crane girders, and, through the research and development, the technology can make the forging crane to improve work efficiency. In this technology, the purpose of this article is forging crane set of main performance parameters of frequency converter, PLC and main control calculation method of application.In this paper, the forging crane has carried on the simple introduction, including the power supply mode of electrical system of crane, institutions, driving device, control mode and operation form, etc. Meanwhile, of forging crane currently forging process are analyzed in detail. Focusing on the present conditions, the reasons of the hydraulic press for forging crane is a great threat, and protection measures used in forging crane, through the analysis of the disadvantages of this kind of passive protection measures, which brings up a kind of active protection control modes, namely the idea of following control. The application of following technology, the advanced theory of the frequency conversion control system based on crane, strong ability of logic operation with PLC, through research and development program and the actual test, this kind of following control theory is applied to the crane hoisting mechanism, can fundamentally solve the forging process for crane safe hidden trouble.Following control technology in the application of the forging crane can under the premise of without changing the mechanical structure, the use of current electric control system, improve the forging crane safety, high efficiency; And reduce mechanical manufacturing costs; Cancel the passive protective components; Reforming the current forging process, improve the forging process of the safety of the crane.The forging process of large forging crane, hydraulic press and crane are basically depend on many people operation, the operation is characterized by frequent operation,repeatedly confirmed forgings, high rate of artificial operation misoperation, forging processtrival. Applied in this paper, the following control theory, the crane only artificial after completion of simple lifting motion on the action button after selecting "forging model", the whole forging process without the need for human intervention, all done by the frequency converter and PLC in the background.Following control theory,which can adapt the forging crane fast forging and slow forging process requirement, and can effectively improve the efficiency of forging, which fully satisfy user requirements.Based on the following control of forging crane in June 2013 successful application to the Shandong TongYu steel company forging workshop.Described in this article refers to GB/T 20776 crane standards specified in the forged industrial metallurgy bridge crane. |
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