Device for measuring small clearance between end faces of mechanical products

Abstract

The invention relates to a device for measuring the small clearance between end faces of mechanical products, which is used for measuring the clearance between the parallel upper end faces of a first workpiece and a second workpiece, and the first workpiece is nested in a concave cavity of the upper end face of the second workpiece. The device comprises a supporting plate, a bracket cylinder, a second workpiece holddown piece, a connecting sleeve, a first workpiece holddown shaft, a sensor and a workpiece positioning clamp, wherein the bracket cylinder is fixedly connected onto the upper surface of the supporting plate, the second workpiece holddown piece and the connecting sleeve are arranged in the bracket cylinder in a sliding fit manner, the sensor is provided with a sensing head, and the first workpiece and the second workpiece are clamped at the top of the workpiece positioning clamp. According to the device for measuring the small clearance between the end faces of the mechanical products, the relative measurement of end face clearances is realized through the design of a three-layer annular sleeve structure, and a reference member can be concentric with a measuring column through the introduction of a gas floating support technology, so that two measuring faces are ensured to be parallel, the precise measurement of the small clearance between the end faces is realized, and the minimum value of the clearance between the end faces is ensured to be measured; and furthermore, the function of measured surface cleaning is realized through a blowing rod of the device.

Description

technical field [0001] The invention relates to a production measuring tool, in particular to a measuring device for a small gap on the end face of a mechanical product. Background technique [0002] For some key dimensions that require high precision and affect product performance, online monitoring is required during the production process; The gap size of the end face must meet the specified value of the design requirements. If the gap is too large or too small, it will affect the oil supply performance of the oil pump motor. Therefore, in order to control the product quality to meet the technical standards, the size must be 100% checked after the assembly is completed. online test. [0003] In the Chinese patent "Measuring method and measuring device for cavity depth or end face clearance of mechanical products" with patent number ZL200910095513.4, a measurement method based on comparing the reference surface and the measuring disc is disclosed. The measured value of t...

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Problems solved by technology

[0004] 1. Due to the need to install more electronic probes (three evenly distributed on each disc), the cost is relatively high;

[0005] 2. Since the comparison reference disc and the measuring disc are movably connected (sliding sleeve) in the hole of the fixed block of the test piece through the bolt with a spring, the existence of the fit gap between the bolt and the hole of the fixed block of the test piece makes the disc is Floating, under the action of the spring force, the lower end surface of the disc will be close to the comparison reference surface or the surface to be measured, as long as the three highest points of the measurement surface touched by the disc are not equal in height (generally determined by the flatness of the measured surface error, or caused by the parallelism error between the measurement surface and the comparison reference surface after installation), the disc will tilt, so the actual measurement is the comprehensive distance between the two planes, and does not reflect the minimum value of the end clearance , especially when the size of the gap value required to be measured is in the same order of magnitude as the flatness error or the parallelism error after installation, the measurement error is very large, so it is not suitable for measuring the small gap on the end face

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