Fixed molding method capable of keeping distance between inner tube and outer tube of oil quantity sensor

Abstract

The invention provides a fixed molding method capable of keeping the distance between an inner tube and an outer tube of an oil quantity sensor, and aims at providing the fixed molding method capable of meeting the requirement for the distance between the inner tube and the outer tube. According to the scheme, before molding, parts, extending out of the metal outer tube (2), of a nonmetal shaft pin (4) are clamped into oppositely-combined inner holes of two annular hole molding clamps (1), and the two-side extending-out parts, extending out of the metal outer tube in the radial direction, of the nonmetal shaft pin fall into dovetail grooves of the two annular hole molding clamps; and then electric connection to heater strips wound on the annular hole molding clamps is achieved, electrification is carried out to increase the temperature so as to melt the nonmetal shaft pin, the melted nonmetal shaft pin is molded in the annular hole molding clamps, and the metal outer tube and the metal inner tube (3) are connected into a whole. According to the fixed molding method, molding with the fixed distance between the outer tube and the inner tube is completed through the non-standard annular hole molding clamps, and the problems that positioning with the equal distance between thin wall barrels cannot be easily achieved through a traditional fixing method, scrapping is likely to occur, and the percent of pass is low are solved.

Description

technical field [0001] The invention relates to a process method for forming a non-metal shaft pin on a ring hole forming jig and satisfying the fixed distance between an inner tube and an outer tube. Background technique [0002] In the prior art, the method for fixing the metal outer tube and the inner tube is relatively common, and all can directly use the pivot pin to pass through the positioning holes on the inner tube and the outer tube, and then use the pivot pin riveting instrument to perform riveting. But it is not so simple for a capacitive sensor consisting of several concentric cylindrical plates. The sensor is a part that detects the position (height) of the oil in the container by using the change of the capacitance between the sensor housing and the sensing electrode caused by the oil entering the container, and converting this change into a current change. The sensing part of the capacitive oil level sensor is a coaxial container. When the oil enters the con...

AI Technical Summary

Problems solved by technology

The capacitive sensor needs to ensure the fixed distance between the outer tube and the inner tube, and cannot be directly formed into one body. At the same time, it must ensure that the inner tube and the outer tube cannot move relative to each other during the riveting process of the non-metallic shaft pin. It is not easy to achieve a thin-walled tube with traditional fixing methods. Equidistant positioning between bodies, it will be scrapped if you don’t pay attention to it, and the pass rate is low

And it is easy to cause material waste, time waste, increase working hours, and increase economic costs

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