Detection device for tooth shape size of cross-shaped key

Abstract

The invention discloses a detection device for a tooth shape size of a cross-shaped key. According to the detection device, a backlight source is placed on a U-shaped objective table; a fixed plate is vertically and fixedly arranged on the side face of the objective table; a 90-degree rotary air cylinder is mounted in the center of the fixed plate; a handle of the cross-shaped key is fixedly arranged on a clamp; an air pump is connected with the 90-degree rotary air cylinder by a solenoid valve; a CCD (Charge Coupled Device) camera is located above a tooth-shaped part of the cross-shaped key to be detected; the camera is connected with a computer host by an image acquisition card; a display is connected with the computer host; a PLC (Programmable Logic Controller) is connected with the computer host. According to the detection device disclosed by the invention, the backlight source is used for clearly showing a tooth-shaped outline of the key in the view field of the camera; image interferences are removed by image processing; the boundary of the tooth-shaped image is positioned and the distance between opposite sides of a tooth shape is calculated. A 90-degree rotary mechanism is used for realizing the all-directional image acquisition on the tooth shape of the key and whether a product is qualified or not is judged according to the distance between image sampling points and a pre-set threshold value, and furthermore, the problem of a traditional detection manner that online detection can not be carried out in real time is solved.

Description

Technical field

[0001] The invention relates to a machine vision on-line detection device, in particular to a cross-shaped key tooth profile size detection device. Background technique

[0002] The cross key is a key type commonly used in daily life. It is used with the cross lock cylinder and is mostly used on anti-theft doors. Due to its special tooth structure, there is a tooth shape in four coaxial directions that differ by 90 degrees. There are many problems in manual inspection of the tooth profile quality: high labor costs, low efficiency, long-term work will inevitably lead to false detections and missed inspections due to eye fatigue, and manual sampling is difficult to achieve real-time online detection.

[0003] Machine vision is a new type of inspection method, which has been widely used in dimensional measurement, angle measurement, defect detection and other fields. It has the advantages of high speed and high accuracy. Summary of the invention

[0004] In view of the...

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