Checking fixture capable of simultaneously measuring various tolerances

Abstract

The utility model discloses a testing fixture capable of simultaneously measuring various tolerances, which belongs to the technical field of rapid detection of engine cylinder covers. The testing fixture comprises an optical axis, a rotating cap, a gauge stand, a dial gauge, a shaft retainer ring, a screw and a jackscrew, wherein the top of the optical shaft is in seamless fit with the rotating cap; one end of the gauge stand is connected with the rotating cap through a screw, and the included angle between the gauge stand and the rotating cap is 45 degrees; the other end of the gauge stand is vertically and fixedly connected with the dial gauge through a jackscrew; the shaft check ring is arranged on the optical shaft and used for fixing the rotating cap so as to determine the position of the dial indicator. Through fine control of dimensional tolerance and form and location tolerance of the gauge, cylindricity tolerance of the guide pipe can be directly measured, runout and roundness of a valve seat conical surface relative to the center of the guide pipe can be measured at the same time, multiple detection requirements of one-time measurement are met, and the detection process is simple and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of rapid detection of engine cylinder heads, in particular to a checking tool for measuring multiple tolerances simultaneously. Background Art

[0002] The quality of the matching between the engine valve and the valve seat cone directly affects the engine performance. The guide tube hole and the 90° cone on the upper side have relatively strict size, shape and position requirements.

[0003] When processing inner holes and conical surfaces on site, forming cutters are generally used. However, when the cutter is worn, it will cause unqualified conditions such as size and runout, which will directly lead to the scrapping of the processed parts. Therefore, real-time detection of this tolerance requirement has become a means of ensuring quality. There is also the problem of difficulty in detecting the conical surface. Currently, only three-coordinate detection equipment can be used for detection, which requires more manpower costs and untimely detection, resulting in increased costs.

[0004] Therefore, a comprehensive inspection fixture is needed that can measure multiple tolerances at the same time. By precisely controlling the dimensional tolerance and form and position tolerance of the inspection fixture, the cylindrical tolerance of the guide tube can be directly measured. At the same time, the runout and roundness of the valve seat cone surface relative to the center of the guide tube can also be measured, thus meeting the needs of measuring multiple inspection requirements at one time. Utility Model Content

[0005] The purpose of the utility model is to propose a gauge for measuring multiple tolerances at the same time in view of the shortcomings of the prior art. The gauge includes an optical axis, a rotating cap, a table seat, a micrometer, a shaft retaining ring, a screw, and a top screw;

[0006] Among them, the top of the optical axis fits with the rotating cap without a gap; one end of the dial base is connected to the rotating cap by a screw, and the angle between the dial base and the rotating cap is 45°; the other end of the dial base is vertically fixed to the micrometer by a top screw; the shaft retaining ring is set on the optical axis, which is used to fix the rotating cap to determine the position of the micrometer.

[0007] The standard dimension of the optical axis is φ7.

[0008] The material of the optical axis and the rotating cap are both 42CrMo.

[0009] The beneficial effects of the utility model are:

[0010] 1. By using this device to increase the frequency of inspection, the production of defective parts in cone surface and duct hole processing can be avoided, which will cause air leakage, and is of great benefit to improving the performance of the engine.

[0011] 2. By precisely controlling the dimensional tolerance and form and position tolerance of the inspection fixture, the cylindrical tolerance of the guide tube can be directly measured. At the same time, the runout and roundness of the valve seat cone surface relative to the guide tube center can also be measured, realizing the need to measure multiple inspection requirements at one time, and the inspection process is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 (a), (b), and (c) are respectively a bottom view, a front view, and a left view of the inspection fixture for simultaneously measuring multiple tolerances of the utility model;

[0013] Figure 2 This is a schematic diagram of the use of the inspection fixture for simultaneously measuring multiple tolerances of the utility model. DETAILED DESCRIPTION

[0014] The utility model provides a gauge for measuring multiple tolerances simultaneously. The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 (a), (b), and (c) are respectively a bottom view, a front view, and a left view of the inspection tool for measuring multiple tolerances simultaneously of the utility model; the inspection tool for measuring multiple tolerances simultaneously of the utility model comprises an optical axis 1, a rotating cap 2, a table base 3, a micrometer 4, a shaft retaining ring 5, a screw 6, and a top screw 7;

[0016] Among them, the top of the optical axis 1 is seamlessly matched with the rotating cap 2; one end of the meter base 3 is connected to the rotating cap 2 by a screw 6, and the angle between the meter base 3 and the rotating cap 2 is 45°; the other end of the meter base 3 is vertically fixedly connected to the micrometer 4 by a top screw 7; the shaft retaining ring 5 is set on the optical axis 1, which is used to fix the rotating cap 2 to determine the position of the micrometer 4. The material of the optical axis 1 and the rotating cap 2 is 42CrMo.

[0017] Figure 2 The schematic diagram of the use of the inspection tool for measuring multiple tolerances at the same time of the utility model. Install the optical axis 1 into the φ7 hole. If it cannot be installed, the cylindrical degree of the φ7 hole is out of tolerance. The top of the optical axis 1 and the inner hole of the rotating cap 2 are matched. The rotating cap 2 is rotated to drive the table base 3 to move, and the display data on the micrometer 4 is read. Within a circumferential range, the runout of the cone surface and the roundness tolerance data of the cone surface can be measured. This inspection tool can also be used to measure the shape and position tolerance between the valve sealing surface and the guide tube hole.

[0018] After using this device, the inspection frequency can be increased to avoid the occurrence of poorly processed cone surfaces and duct holes, which may cause air leakage. This is very beneficial for improving engine performance, while reducing measurement waiting time. It is simple and easy to use.

Claims

1. A gauge for measuring multiple tolerances simultaneously, characterized in that: The inspection tool comprises an optical axis (1), a rotating cap (2), a dial base (3), a micrometer (4), a shaft retaining ring (5), a screw (6), and a top screw (7); The top of the optical axis (1) and the rotating cap (2) are seamlessly matched; one end of the dial base (3) is connected to the rotating cap (2) by a screw (6), and the angle between the dial base (3) and the rotating cap (2) is 45°; the other end of the dial base (3) is vertically fixedly connected to the micrometer (4) by a top screw (7); a shaft retaining ring (5) is arranged on the optical axis (1) and is used to fix the rotating cap (2) to determine the position of the micrometer (4).

2. The gauge for measuring multiple tolerances simultaneously according to claim 1, characterized in that: The reference dimension of the optical axis (1) is φ7.

3. The gauge for simultaneously measuring multiple tolerances according to claim 1 or 2, characterized in that: The optical axis (1) and the rotating cap (2) are both made of 42CrMo.

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