Automatic control system of pipe gang saw machine and control method thereof

Abstract

The invention discloses an automatic control system of a pipe gang saw machine and a control method thereof. The system comprises a programmable logic controller (PLC), a servo controller, a direct current speed regulator, an operating screen and a low-voltage electric device, wherein the PLC is a main station for an entire profibus network and is connected with a slave station through a profibusnetwork bus; and the slave station comprises the direct current speed regulator, the servo controller, the operating screen and an ET200M distributed input / output (I / O) system module and is connectedwith a remote digital quantity I / O module through the ET200M distributed I / O system module. The method comprises the following steps of: reading data; controlling a balance cylinder; calculating an advance distance; and setting cutting parameters. Through the system and the method, a control procedure is simplified, faults can be easily removed, and cutting efficiency is improved. The lifting of the balance cylinder is controlled by judging a given speed of the servo motor, so that the machining parameters are more rational.

Description

technical field [0001] The invention relates to a pipe gang saw double-driven by a servo motor and a hydraulic balance cylinder, in particular to an automatic control system and a control method of the pipe gang saw. Background technique [0002] At present, the pipe gang saws used in China usually adopt the dual drive mode of servo motor and balance cylinder, but there are the following deficiencies in the synchronous control of servo motor and balance cylinder, setting of working position and setting of cutting parameters: [0003] 1. Most of the existing control systems use external commands or automatic commands to simultaneously act on the servo motor and the balance cylinder to achieve synchronous control. In this way, there will be multiple commands to control the balance cylinder in different modes, which brings great difficulties for debugging and future troubleshooting. Inconvenience. In addition, since the pipe gang saw needs to move up and down slightly near the...

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Problems solved by technology

[0003] 1. Most of the existing control systems use external commands or automatic commands to simultaneously act on the servo motor and the balance cylinder to achieve synchronous control. In this way, there will be multiple commands to control the balance cylinder in different modes, which brings great difficulties for debugging and future troubleshooting. Inconvenience

In addition, since the pipe gang saw needs to move up and down in the vicinity of the reference point switch in the process of returning to the reference point, it is obviously not appropriate to use the external "reference point return" button switch to control the balance cylinder

[0004] 2. The existing control system sets the working position as a constant, that is, it cuts to a fixed position every time, so that when the radius or number of pipes is different, it will cause "less cutting" or "more cutting", less cutting The consequence is that the tube cannot be cut through and the consequence of multiple cuts is that the cutting efficiency is reduced

[0005] 3. The sawing parameters of the existing control system are directly set as the rotational speed of the spindle and the feed line speed of the servo motor, which does not meet the requirements of the machining process

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