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Method for detecting apparent defects of O-shaped rubber ring

A technology of appearance defects and detection methods, applied in the direction of optical testing defects/defects, etc., can solve the problems of easy missed inspection and easy visual fatigue, and achieve the effect of improving efficiency, protecting eyes and improving detection efficiency.

Inactive Publication Date: 2014-04-09
南京金三力橡塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the detection of appearance defects of O-shaped rubber rings in the prior art, workers are prone to visual fatigue and missed inspections during detection. The present invention provides a detection method for appearance defects of O-shaped rubber rings. Through a simple method, To detect the appearance defects of O-shaped rubber rings, the detection is accurate, can avoid missed inspections, and the most important thing is to reduce or even avoid the occurrence of visual fatigue

Method used

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  • Method for detecting apparent defects of O-shaped rubber ring
  • Method for detecting apparent defects of O-shaped rubber ring
  • Method for detecting apparent defects of O-shaped rubber ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, a detection method for the appearance defects of O-shaped rubber rings, for figure 1 Inner diameter a: ∮11mm, wire diameter b: ∮2.5mm O-shaped rubber ring for inspection, the steps are:

[0034] (1) Condition preparation, install two parallel fluorescent lamps 1, the light emitted by the fluorescent lamps 1 is white light, the illuminance F of the fluorescent lamps 1 is 6800lux, and the distance between the two fluorescent lamps 1 is S; prepare two plastic plates, one for A flat plate with a groove in the middle. The color of the plastic plate is represented by the CIE1976 color system: L* is 75, a* is -23, and b* is 60; the overall dimensions of the plastic plate are 300mm in length, 260mm in width, and 3mm in thickness;

[0035] (2) The O-shaped rubber ring 3 to be inspected for appearance is placed in the box to be inspected;

[0036] (3) Put the O-shaped rubber ring 3 in the box of the product to ...

Embodiment 2

[0043] Same as Example 1, the difference is: this example is to detect the O-shaped rubber ring with inner diameter a:∮5.5mm and wire diameter b:∮1.5mm; the illuminance F of the fluorescent lamp 1 is 7400lux; the color of the plastic plate is based on CIE1976 The color system indicates: L* is 71, a* is -15, b* is 45; H is selected as 1.2m, and workers need to work continuously for A equal to 4. The method of the workers in Example 1 is reversed, that is, the second group adopts the method of the present invention, and the first group adopts the working method of its original factory.

[0044] After 4 hours of work, 16 of the workers in the first group experienced visual fatigue such as sore eyes, and the average number of O-shaped rubber rings 3 detected by each person was 1,735. During the re-inspection, a total of 207 pieces were missed. , there are 10.35 missed inspections per person on average, and the missed inspection rate is 0.6%. Among these 207 pieces, 153 pieces are ...

Embodiment 3

[0046] Same as Example 1, the difference is: this example is to detect the O-shaped rubber ring with inner diameter a:∮2mm and wire diameter b:∮1.5mm; the illuminance F of the fluorescent lamp 1 is 6300lux; the color of the plastic plate is CIE1976 color The system indicates: L* is 79, a* is -30, b* is 75; H is selected as 0.8m, and workers need continuous working hours A equal to 2.

[0047] After 2 hours of work, 2 of the workers in the second group experienced visual fatigue such as sore eyes. The average number of O-shaped rubber rings 3 detected by each person was 937. During the re-inspection, it was found that a total of 78 pieces were missed. , each person has 3.9 missed inspections on average, and the missed inspection rate is 0.4%. Among these 78 pieces, 45 pieces are concave-convex defects at the parting surface, and 33 pieces are flow marks on the sealing surface; In the first group of the method, the average number of O-shaped rubber rings 3 detected by each perso...

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Abstract

The invention discloses a method for detecting apparent defects of an O-shaped rubber ring and belongs to the field of detection of the O-shaped rubber rings. The method comprises the following steps: (1) preparing conditions; (2) preparing the O-shaped rubber ring of which the appearance is required to be detected; (3) threading the O-shaped rubber ring in a to-be-detected product box; (4) performing the process that a worker holds two ends of a steel wire and stands at a middle position between two fluorescent lamps during detection; (5) checking the O-shaped rubber ring on the steel wire; (6) spreading the qualified O-shaped rubber ring detected in the step (5) on a plastic plate; and (7) checking another sealing surface of the O-shaped rubber ring. According to the method, the illuminations and directions of the fluorescent lamps and the color of the plastic plate are controlled, so that a visual effect in the process of detecting the O-shaped rubber ring by the worker is improved, visual fatigues of the worker are avoided, the efficiency is improved, the missing inspection of the appearance can be effectively avoided, and the missing inspection rate is greatly reduced.

Description

technical field [0001] The invention belongs to the detection field of O-shaped rubber rings, and in particular relates to a detection method for appearance defects of O-shaped rubber rings. Background technique [0002] The cross-sectional structure of the rubber O-ring is extremely simple, the sealing performance is reliable, the design is simple, the processing is convenient, and the installation and replacement are easy, so it is used in various sealing occasions. [0003] Rubber O-rings will produce a variety of appearance defects during the production process, as listed in the national standard "GB / T3452.2-2007: Specifications for the Appearance Quality Inspection of O-ring Rubber Rings for Hydraulic and Pneumatic Applications": dislocation, mismatch, combination Flash, mold shrinkage cracks, excessive trimming, lack of glue, dents, flow marks, etc., are mostly inspected by human eyes in the later inspection, but there is always a risk of missed inspections. Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
Inventor 徐海潮杜爱丽李香
Owner 南京金三力橡塑有限公司
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