Method for automatically detecting back-stitching of steel needle of injector by using mechanical vision system

A machine vision system and automatic detection technology, applied in instruments, measuring devices, optical devices, etc., can solve the problems of inability to guarantee product qualification rate detection quality, high labor intensity, low monitoring speed, etc., so as to reduce the labor intensity of inspection. Effect

Inactive Publication Date: 2012-01-04
WUXI ZHONGWANG 4D TECH
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  • Description
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Problems solved by technology

[0004] Aiming at the problems that the existing technology relies on manual detection for the on-line detection of syringe steel needles, workers are prone to visual fatigue, the labor intensity is high, the product qualification rate and detection quality cannot be guaranteed, and the monitoring speed is low. The present invention provides a machine vision The system's automatic detection method for syringe steel needles can greatly reduce the labor intensity of workers' detection, with high detection accuracy and fast speed, which can effectively ensure the pass rate of ex-factory products

Method used

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  • Method for automatically detecting back-stitching of steel needle of injector by using mechanical vision system
  • Method for automatically detecting back-stitching of steel needle of injector by using mechanical vision system
  • Method for automatically detecting back-stitching of steel needle of injector by using mechanical vision system

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Effect test

Embodiment 1

[0030] Example 1. Testing of qualified products:

[0031] Such as figure 1 The image of the top of the steel needle is shown, where the top protruding part is the visual image of the tip of the steel needle.

[0032] Fix the Basler ACA640-100GM industrial camera on the side of the steel needle. The distance between the camera and the side of the steel needle is about 20mm. Use a Schneider zoom lens, adjust the focal length to 16mm, adjust the aperture to the maximum, and adjust the exposure time to 0.41ms. The detection accuracy is set to 0.05mm, and the top height of the qualified steel needle is set to at least 0.5mm. Special white LED surface light source is used to illuminate from the opposite side of the camera (backlight), and a semi-closed shielding metal frame is used to shield the influence of external stray light, so as to obtain a more stable visual image, reflecting the obvious characteristics of the top of the steel needle . The LED surface light source of this proj...

Embodiment 2

[0037] Example 2: Detection of products with inverted needles:

[0038] Such as figure 2 In the image of the top of the steel needle shown, the top protruding part is actually the visual image of the bottom of the steel needle.

[0039] Fix the Basler ACA640-100GM industrial camera on the side of the steel needle. The distance between the camera and the side of the steel needle is about 20mm. Using a Schneider zoom lens, adjust the focal length to 16mm, the aperture to the maximum, and the exposure time to 0.41. ms. The detection accuracy is set to 0.1mm, and the top height of the normal steel needle of the qualified product is set to at least 0.5mm. Special white LED surface light source is used to illuminate from the opposite side of the camera (backlight), and a semi-closed shielding metal frame is used to shield the influence of external stray light, so as to obtain a more stable visual image and reflect the obvious characteristics of the top of the steel needle . The LED s...

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Abstract

The invention provides a method for automatically detecting back-stitching of a steel needle of an injector by using a mechanical vision system. The method comprises the following steps of: setting the top height of the steel needle as a detection parameter; setting the detection accuracy and qualified range of different detection parameters according to a user requirement; starting a camera by using an external trigger and control signal to shoot an image of an on-line operating steel needle in real time, and transmitting the shot image to a computer for detection; processing the image by using the computer with an image algorithm, and extracting the image of the top of the steel needle; calculating the top height of the steel needle, and judging whether a product is a qualified product or a rejected product by using the calculated top height of the steel needle; and eliminating the rejected product from an appointed discharge hole by using the external trigger and control signal. The method has the advantages that: the detection accuracy and speed of the back-stitching of the steel needle of the injector are high; and the yield of products can be effectively guaranteed.

Description

Technical field [0001] The invention relates to the technical field of on-line detection using a machine vision system, and in particular to a method for automatically detecting whether there is an inverted needle in the syringe steel needle using a machine vision system at the assembly site of the syringe steel needle. Background technique [0002] At the scene of the assembly workshop of the steel needle of the syringe with flow-through operation, it is necessary to conduct online inspection on whether the steel needle is inverted (that is, the needle is inserted into the needle seat). In the prior art, the on-line detection of the inverted needle of the steel needle is carried out manually. About 80 people are arranged next to the steel needle production machine to detect and process the inverted needle of the steel needle. According to the test results, the products are divided into qualified products (if no Needle) and defective products (if there is a needle). Non-conformi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/04B07C5/10
Inventor 董仲伟
Owner WUXI ZHONGWANG 4D TECH
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