Visual testing device for automobile braking flexible pipe joint

Abstract

The invention discloses a visual testing device for an automobile braking flexible pipe joint, wherein visual testing of the automobile braking flexible pipe joint is realized through an image acquisition system which is composed of an LED square light source, a CCD industrial camera, an image acquisition card and a computer. Because backlight illumination is adopted, high resolution of the acquired image is realized. Compared with a traditional manual automobile braking flexible pipe joint testing method, the visual testing device for the automobile braking flexible pipe joint has an advantage of greatly improving testing efficiency. Furthermore through a software system which is developed through LabVIEW, an image processing and edge detecting algorithm is utilized for testing the dimension of the automobile braking flexible pipe joint, and furthermore testing sensitivity is greatly improved.

Description

technical field [0001] The invention belongs to the field of dimension measurement, in particular to a visual detection device for automobile brake hose joints. Background technique [0002] At present, hydraulic braking and pneumatic braking are widely used in the braking system of automobiles. The brake actuator transmits the pressure to the wheel through the brake hose to complete the brake. Safety of the dynamic system. At present, the direct cause of many traffic accidents is the quality problem of the brake hose, which leads to the failure of the brake when the car is running at high speed and leads to tragedy. In 1997, my country issued the national standard GB 16897-1997 "Brake Hose" to regulate the production of brake hoses. In 2003, the country included brake hose products into the scope of compulsory certification products. [0003] However, with the growth of vehicle ownership, the maturity of the road network, and the substantial increase in driving speed, hig...

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Problems solved by technology

[0003] However, with the growth of vehicle ownership, the maturity of the road network, and the substantial increase in driving speed, higher and higher requirements are placed on the braking performance and driving safety of automobiles. The standards issued in 1997 can no longer meet the needs of products At the same time, the testing items and indicators also lag behind the international standards, so the relevant standard-setting departments have formulated a new mandatory standard for brake hoses GB 16897-2010 "Brake Hose Structure, Performance Requirements and Test Methods". In addition to the experimental indicators of the old standard, it has strengthened the simulation of the state of the brake hose during sudden braking during actual driving. Compared with the 1997 version of the standard, it has been greatly improved, but the corresponding requirements for the joints are still not perfect. The 2010 version of the standard focuses more on Based on the performance test of the assembly, the importance of the joint to the performance of the hose assembly is ignored, and only the salt spray test requirements for the joint are specified, while the thread sealing performance of the joint, the length of the thread, the angle of the sealing cone angle, etc. Key indicators affecting assembly performance

At present, the purchase of brake hoses by OEMs requires companies to inspect the brake hose connectors one by one. Brake hose companies inspect hundreds of thousands of hose connectors every day, which is labor-intensive, inefficient, and has a high error rate.

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