Automatic control system and method of foundry production line by using programmable controller

Abstract

The invention discloses an automatic control system and method of a foundry production line by using a programmable controller. The automatic control system comprises a PLC (Programmable Logic Controller) control device, a pneumatic positioning system, a running system of a variable frequency motor of a truck, a ratio speed control system of an oil cylinder of the truck and a photoelectric-controlled automatic material pushing system, wherein control sub-systems are respectively connected with the PLC control device. The automatic control method comprises the following steps of: pneumatic positioning of a sand mould carrying trolley on a sand mould carrying trolley rail; running of the truck on a truck rail; control on forward and backward speeds of the oil cylinder of the truck; and automatic pushing of sand moulds on the sand mould carrying trolley to a vibrating shake-out machine through photoelectric control. According to the automatic control system and method provided by the invention, the traditional manual operation is replaced, the foundry production efficiency is high and the reliability is high; displacement or corrosion caused when the truck runs is effectively avoided, thereby improving the production safety; the running speed of the truck is accurately controlled; whether the sand moulds exist in the truck is detected by using a photoelectric sensor, so that the work efficiency and the accuracy are high.

Description

technical field [0001] The invention relates to an automatic control system of a casting production line using a programmable controller and a control method thereof. Background technique [0002] Sand casting is widely used in industry. The casting process includes a sand processing system and a sand molding system. The processing system also includes steps such as recovery, cooling, removal of impurities, sand mixing according to the formula, and transportation and distribution. The molding system passes through the molding machine. For molding, the trolley continuously sends the sand mold to the pouring work surface through the track, cools and removes the sand. Traditional sand casting is manually operated, with heavy workload, harsh working environment, low casting efficiency and poor control of sand mold quality. [0003] Some existing automatic control systems of sand casting production lines have the following problems: (1) Dozens of sand-carrying trolleys advance i...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the existing sand casting production line control system, provide a new type of casting production line automatic control system and its method controlled by a programmable Low efficiency and inability to control the quality of the sand mold well; to overcome the inaccurate positioning of the sand-carrying trolley in the existing casting control system, which easily leads to collision between the sand-carrying trolley and the trolley track, and poor positioning and control accuracy of the trolley on the track. The car rushes out of the track or the walking speed is unreasonable, etc. Manually observe whether there are sand molds on the sand-carrying trolley, and then manually open and push the cylinder to control the waste of manpower and low accuracy.

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