In order to ensure the internal pressure balance of the fuel tank and avoid oil leakage, it is necessary to test the sealing performance of the fuel tank cap of the hybrid new energy vehicle. However, due to the special shape of the fuel tank cap of the new energy vehicle, the sealing performance test has become a difficult problem. This time, Harris technology will show a new type of fuel tank cap sealing tester, which has played a good role in the new energy vehicle fuel tank cap sealing test. The following is the application example of the tester.
1、 Shape analysis of fuel tank cap of new energy vehicle
The picture above shows the fuel tank cap of new energy vehicle to be tested by Harris technology this time. It is a disc structure with a convex corner, uneven upper and lower sides and edge grooves. There is a 90 degree zigzag air hole on the upper part, which is mainly used to adjust the air pressure of the oil tank. Therefore, the oil tank cover is not sealed as a whole, and we need to seal the air hole when testing. The lower part is sealed, which is the focus of the detection, but the single-sided structure of the tank cap can not be directly detected, which is the difficulty of the detection scheme.
2、 Sealing requirements and key points of fuel tank cap for new energy vehicles
1. Ensure that the product will not be polluted, damaged or blocked
2. The shape of the product is irregular, and it is a disc structure, which focuses on the detection of the sealing of the lower part of the oil tank cap, so the direct detection can not be used, and the joint detection method needs to be used.
3. Realize the monitoring and statistics of test data, provide scientific basis for later production adjustment, and realize effective monitoring and improvement of defective products.
4. Customers require to realize double station tooling detection, one operator can operate two products at the same time to improve the detection efficiency and help the production capacity.
3、 New energy vehicle fuel tank cap sealing difficulty breakthrough
In order not to cause damage and pollution to the fuel tank cap of new energy vehicles in the detection, Harris technology uses indirect detection method to customize a specific mold for the fuel tank cap of new energy vehicles to assist in the non-destructive detection. The following is the actual picture of the mold.
Harris TechnologyThe tester is divided into three parts: tester, gas source and tooling. Because the tester, gas source and tooling are self-contained, in order to realize the dual position detection, Harris technology has configured two sealing testers for them, and we design the tester as a cabinet to scientifically design the instrument space, reduce the floor area and facilitate operation.
The instrument can be equipped with molds and corresponding tooling according to the shape or details of products, so as to meet the needs of different products. It can not only improve the use value of the tightness detector, but also facilitate the manufacturer to call the equipment and reduce the investment of the detection equipment. Here's howHarris TechnologyNew energy vehicle fuel tank cap sealing double position detector.
4、 Operation procedure of new energy vehicle fuel tank cap sealing instrument
The first step of the test is to set the data of the instrument. After setting once, the data can be used to simplify the test process. Because of the dual station detector, we need to set the relevant detection parameters for the two instruments. The instrument has"Positive" and "negative" forms of pressure, and8There are three basic test modes, which can be selected or combined. applicationtwenty-fourpositionA/Dtransformation,32positionCPUOperation, and fully independent development of industrial control operating system, with full touch human-computer interface. built-inRS232Serial portRJ45Network portUSBCommunication interfaceLTPexternalI/OControl port, support a variety of communication protocols, enhance the operability of the equipment, improve the efficiency of the manufacturer's detection.
The second step is to put the fuel tank cap to be tested into two molds respectively. After the tester is started, the upper and lower molds will be closed, and then the air source will inflate the mold of the fuel tank cap of the new energy vehicle. The precision pressure sensor of the sealing test equipment of the fuel tank cap of the new energy vehicle senses the air pressure change in the mold, The value of air pressure change will be transmitted to the detection system and displayed. We can clearly see the change of air pressure value on the instrument.
The third step is to enter the pressure stabilization stage. In this stage, we do not need to operate and wait for the air pressure to stabilize itself. According to the change of air pressure, the pressure sensor can get the leakage value of the gas after a series of calculations, and detect the leakage value according to the leakage valueGPSRadar locator anti-jamming performance and its applicationIPWaterproof grade, the following is the test details.
The above content is the application demonstration of hermetic tester for fuel tank cap of new energy vehicles. The instrument has realized double station and multi station detection, and can be customized according to the needs of users. The instrument can not only test the sealing of new energy fuel tank cap, but also test the sealing, waterproof and air tightness of charging gun, automobile lamp, wiring harness and spare parts. See the case sharing in the past for the application scheme.
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