High-density-distance display terminal magnetic steel seat inspection jig

Abstract

The invention relates to a high-density-distance display terminal magnetic steel seat inspection jig, and belongs to the technical field of LED inspection. The high-density-distance display terminal magnetic steel seat inspection jig comprises a base and a cover plate, a rectangular flat-bottom groove is formed in the middle of the base, the depth of the rectangular flat-bottom groove is slightly smaller than the sum of the thickness of a PCB and the height of a lamp tube, a rectangular through hole is formed in the middle of the cover plate, and a detection plate and a cover plate frame are sequentially arranged on the periphery of the rectangular through hole outwards; the inner edge of the cover plate frame vertically extends downwards to the detection plate, the detection plate is provided with a plurality of magnetic steel seat detection holes, and the thickness of the detection plate is equal to the height of a to-be-detected magnetic steel seat. The height difference of the magnetic steel bases is controlled to be smaller than 0.1 mm, the height difference problem caused by uneven structural parts of small-spacing display terminals is solved, flatness and uniformity of the display terminals are guaranteed, the production cost is reduced, multiple magnetic steel bases can be inspected at a time, workers are prevented from inspecting the magnetic steel bases one by one, troubleshooting of problems is facilitated, and reasons such as manual welding or chip mounter welding, the thickness of the solder paste brushed on the steel mesh, falling or blowing off by hot air can be effectively checked.

Description

technical field [0001] The invention relates to a high-density display terminal magnetic steel seat inspection fixture, which belongs to the technical field of LED inspection. Background technique [0002] At present, small-pitch products have been widely used in the market. Among the small-pitch display terminal products, there are front-dismantling and rear-deploying types. The difference is mainly whether there is enough space for maintenance during installation. The main reason for choosing front-dismantling is because Due to the reason of the project site, it is not possible to stand behind for maintenance; when the front is disassembled, there are cases with and without cabinets. For those without cabinets, the PCB board needs to be adsorbed on the steel frame, and the adsorption can only be carried out by the magnetic steel seat. Adsorption, a display screen is usually spliced ​​by multiple PCB boards. In order to ensure the flatness of the display screen, the reliabi...

AI Technical Summary

Problems solved by technology

[0003] At present, the magnetic steel bases of small-pitch products are all manually welded or placed on ordinary reflow trays. There are the following problems: manual welding is time-consuming and labor-intensive, and two people are required to perform butt welding. The effect is poor, and the defect rate usually reaches 60%. Even if a soldering fixture is used for soldering operations, manual soldering is still difficult to avoid irregular soldering offsets; when using a reflow tray for mounting, usually the same solder paste is used on both sides. The order of the chips is to paste the magnetic steel base first and then the lamp surface, which leads to the risk of the magnetic steel base falling down. At the same time, there are various uncertain factors in the SMD process, such as excessive solder paste causing the high and low feet of the magnetic steel base, and the furnace Occasionally, it is deflected by the blowing of the furnace wind, so the quality of the patch is still not high, and the pass rate is usually maintained at about 60%.

[0004] The installation quality of the magnetic steel base is difficult to solve, and the pass rate is difficult to effectively improve, so it can only be checked and adjusted through the inspection after installation. There may be 10-20 magnetic steel bases on a single PCB board. However, the current requirements for the magnetic steel base The inspection can only be carried out by artificial eyes or calipers to measure and inspect a single magnetic steel seat. Human eye observation is time-consuming and labor-intensive with low accuracy. The caliper inspection is inefficient and cannot meet the needs of production cost and efficiency.

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