Three-motor synchronous control system and control method for suspension conveyer chain

Abstract

The invention relates to a three-motor synchronous control system and control method for a suspension conveyer chain. A PLC basic unit, a PLC analog input unit and a PLC analog output unit are connected in sequence; the output end of the PLC analog output unit is connected with a frequency converter 1, a frequency converter 2 and a frequency converter 3 separately; the frequency converter 1, the frequency converter 2 and the frequency converter 3 are connected with a motor M1, a motor M2 and a motor M3 respectively; the PLC basic unit is connected with a network module, a POD touch screen, a speed measurement signal input part, the frequency converter 1, the frequency converter 2 and the frequency converter 3 separately; and the PLC basic unit and the PLC analog input unit are in signal input connection with each tensioning expansion joint position separately. By adoption of the three-motor synchronous control system and control method, a quite troublesome problem that alarming, caused by a non-mechanical fault, of a position limit switch can only be started by human intervention of a user can be solved, so that use efficiency of equipment is improved.

Description

technical field [0001] The invention relates to the technical field of industrial automation, in particular to a three-motor synchronous control system and control method for a suspension conveyor chain. Background technique [0002] Suspension chain conveyor line is an ideal equipment to achieve automatic and semi-automatic assembly line operations by continuously conveying items within the workshop and between workshops at an ideal speed according to the user's reasonable process line. It can be arranged arbitrarily in the three-dimensional space, can play the role of storage in the air, and save the use of ground space. The hanging conveyor chain is widely used in spraying and baking because of its long conveying distance, large operating speed range, turning, climbing, and flexible layout Drying, surface cleaning, electroplating, assembly and product storage and transmission and transshipment. [0003] Because the transmission line of some suspension chains is very long...

AI Technical Summary

Problems solved by technology

[0015] It can be seen that the main reason for the asynchronous movement of the various parts of the conveyor chain is that the actual speed of the motor is different under the same frequency command of the frequency converter due to the different motor loads.

But another factor cannot be ignored. The suspension conveyor chain is composed of more than 1,000 sections of 40 cm long chains. After hanging the workpiece, the chain will stretch a little, and some suspension conveyor chains will experience temperatures as high as 150 degrees Celsius. In some occasions, there will be places that experience cold water spray or forced air cooling, and the temperature factor will also cause the chain to elongate or shrink. The three-part chain, driven by motors with synchronized speeds, moves at different speeds

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