Error-proofing method and device for screws in assembly production line

Abstract

The invention discloses an error-proofing method for screws in an assembly production line. The method comprises the following steps: setting the quantity of screws, and transmitting to a PLC (Programmable Logic Controller); fixing the screws on workpieces by using an electric screw gun, and inputting a generated torque value into the PLC; turning on one of screw indicating lamps according to the received torque value by using the PLC, and keeping the turned-on indicating lamp in a constantly-on state; comparing the quantity of the turned-on screw indicating lamps with the set quantity of the screws, and judging that the accuracy of screw installation is 100 percent when the two quantities are the same. A device for implementing the method consists of a display distribution box, a control box and the electric screw gun, wherein the display distribution box comprises a dial switch, a plurality of screw indicating lamps, an acousto-optic alarm and a reset button; the control box comprises the PLC and a relay; the dial switch, the screw indicating lamps, the acousto-optic alarm and the reset button are all connected with the PLC; the electric screw gun is connected with the relay and the PLC respectively. By adopting the method, an error-proofing function can be realized for screws, and the accuracy and qualified rate of screw installation are up to 100 percent.

Description

technical field [0001] The invention relates to a screw error prevention device, in particular to a screw error prevention method and device used in an assembly production line. Background technique [0002] The process of screw assembly of traditional automotive interior parts is: the materials are assembled at the assembly station, and after assembly, the screws are fastened with a pneumatic screw gun. After the screw is driven, the inspector uses a paint pen to draw a confirmation mark on the screw. [0003] Using this control mode to produce assembly, there are the following problems: [0004] 1. Due to the use of manual inspection and misplacement in this way, it is easy to cause missing or over-installed screws; [0005] 2. Due to the use of hand-made screws, the inspection by personnel cannot guarantee the quality of screw fastening. It is very easy to cause the screws to not be driven in place, causing the screws to fall off, resulting in problems with product qua...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the use of manual inspection and misplacement in this way, it is easy to cause missing or over-installed screws;

[0005] 2. Due to the use of hand-made screws, the inspection by personnel cannot guarantee the quality of screw fastening

It is very easy to cause the screws to not be driven in place, causing the screws to fall off, resulting in problems with product quality;

[0006] 3. Due to the use of paint pens for marking and misplacement, it is very easy to cause pollution to gloves, work clothes and the environment, and even pollute the product and cause the product to be scrapped. At the same time, the consistency of the product process cannot be guaranteed;

[0007] 4. Due to the use of paint pens for marking and misplacement, it will also cause waste of production costs. A production line consumes 24 paint pens every day, and each consumes about 200 yuan

[0010] 2. Since the number of screws that need to be assembled on each door panel is different, how does the equipment confirm the number of screws required;

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