Aperture perpendicularity measuring head mechanism

Abstract

The utility model belongs to the technical field of workpiece aperture perpendicularity measurement, and discloses an aperture perpendicularity measuring head mechanism which comprises a vertical connecting plate, a sliding plate connected to the vertical connecting plate in a sliding mode, a grating displacement sensor arranged between the sliding plate and the vertical connecting plate and used for detecting vertical sliding displacement of the sliding plate, and a vertical ejector rod arranged at the bottom of the sliding plate. A rotating shaft is rotatably connected to the bottom of the vertical connecting plate, a vertical swing arm is fixed on the rotating shaft, a spherical probe is arranged at the bottom of the vertical swing arm, a horizontal swing arm perpendicular to the vertical swing arm is fixed on the rotating shaft, and the bottom of the vertical ejector rod abuts against the horizontal swing arm; the whole measuring head mechanism adopts a transmission mode that a crank arm and a vertical ejector rod are matched with each other, the inclination change of the inner hole wall is measured and amplified, and then a high-precision grating displacement sensor is adopted for detection, so that the measurement precision is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of workpiece aperture verticality measurement, and particularly relates to an aperture verticality measuring head mechanism. Background Art

[0002] Verticality refers to the state in which the measured element on the workpiece maintains the correct 90° angle relative to the reference element, which is usually referred to as the degree to which the two elements remain orthogonal. Commonly used verticality measurement tools include: vernier calipers, verticality measuring instruments, total stations, theodolites, and coordinate measuring machines. For conventional verticality measurements, the above measurement tools can meet the requirements. In some fields, the verticality between the inner hole and the end face of the workpiece is one of the important parameters, and the detection accuracy requirements for this verticality are also relatively high. For example, the verticality measurement between the inner wall of the inner hole of the valve tappet and the bottom surface of the inner hole, the verticality measurement between the stator inner hole and the assembly surface in the motor manufacturing industry, the verticality measurement between various sleeve inner holes and the assembly surface in the automobile manufacturing industry, etc. For the above-mentioned various types of high-precision verticality measurements between the inner holes and the end faces, the vernier caliper and the conventional verticality measuring instrument in the above-mentioned measuring tools cannot meet the measurement requirements. Although the three-dimensional coordinate measuring machine can collect data and calculate and measure the verticality of the workpiece from different directions in three-dimensional space, the overall operation process is cumbersome and the detection time is long. It is impossible to realize the rapid batch detection of the verticality of the workpieces in the factory, which leads to low production efficiency. Summary of the invention

[0003] The purpose of the utility model is to solve the problems existing in the above-mentioned prior art and propose a hole diameter verticality probe mechanism, so as to realize the measurement of the verticality of the inner hole of the workpiece; the technical solution adopted to achieve the above-mentioned purpose is:

[0004] A probe mechanism for measuring the verticality of an aperture comprises a vertical connecting plate, a sliding plate is slidably connected to the vertical connecting plate, a grating displacement sensor for detecting the upward and downward sliding displacement of the sliding plate is arranged between the sliding plate and the vertical connecting plate, a vertical push rod is arranged at the bottom of the sliding plate, a rotating shaft is rotatably connected to the bottom of the vertical connecting plate, a vertical swing arm is fixed on the rotating shaft, a spherical probe is arranged at the bottom of the vertical swing arm, a horizontal swing arm perpendicular to the vertical swing arm is fixed on the rotating shaft, and the bottom of the vertical push rod rests on the horizontal swing arm.

[0005] Preferably, the length of the vertical swing arm is greater than the length of the horizontal swing arm.

[0006] Preferably, the length of the vertical swing arm is greater than 10 times the length of the horizontal swing arm.

[0007] Preferably, the end of the vertical push rod is a spherical end, and a groove is provided on the horizontal swing arm, and the spherical end rests in the groove.

[0008] The beneficial effects of the utility model are as follows: (1) the probe mechanism as a whole adopts a crank arm plus a vertical push rod to cooperate with the transmission mode, and the tilt change of the inner hole wall is measured and amplified and then detected by a high-precision grating displacement sensor, thereby greatly improving the measurement accuracy;

[0009] (2) Under the action of their own gravity, the slide plate and the vertical push rod press against the horizontal swing arm to ensure that the spherical side head of the spherical probe is lightly pressed against the inner hole wall, similar to the hanging type against the inner hole wall. In this way, when the inner hole wall is slightly tilted, the spherical probe can be pushed away, thereby reducing the measurement error of the device itself and improving the measurement precision and accuracy;

[0010] (3) The vertical push rod and the horizontal swing arm are in point contact with each other, which reduces the measurement error of the device itself and improves the measurement precision and accuracy.

[0011] (4) The measurement repeatability of this mechanism shall not exceed 1.0 μm; the indication error shall not exceed ±(0.6+L / 200) μm;

[0012] (5) This mechanism is installed on the aperture verticality measuring device for use. It has high measurement accuracy, strong stability, intuitive data, convenient operation, and wide applicability. It greatly shortens the detection time and can complete batch rapid detection of workpiece verticality in the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 for Figure 1 Another perspective of the picture;

[0015] Figure 3 This is a diagram of the use state of the utility model;

[0016] Figure 4 for Figure 3 Another perspective of the picture. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 and Figure 2As shown, the utility model includes a vertical connecting plate 24 installed on a slide seat, a slide plate 25 is slidably connected to the vertical connecting plate 24, a grating displacement sensor for detecting the upward and downward sliding displacement of the slide plate 25 is provided between the slide plate 25 and the vertical connecting plate 24, a vertical top rod 26 is provided at the bottom of the slide plate 25, a rotating shaft 23 is rotatably connected to the bottom of the vertical connecting plate 24, a vertical swing arm 22 is fixed to the rotating shaft 23 or is integrally formed with it, a spherical probe 21 is provided at the bottom of the vertical swing arm 22, a horizontal swing arm 27 perpendicular to the vertical swing arm 22 is fixed to the rotating shaft 23, and the bottom of the vertical top rod 26 rests on the horizontal swing arm 27.

[0019] The length of the vertical swing arm 22 is greater than that of the horizontal swing arm 27. The end of the vertical top rod 26 is a spherical end 28. A groove 29 is provided on the horizontal swing arm 27. The spherical end 28 rests in the groove 29. Preferably, the length of the vertical swing arm 27 is greater than 10 times the length of the horizontal swing arm 27.

[0020] When using this mechanism, first install it on the aperture verticality measuring device. Figure 3 and Figure 4 As shown, the aperture verticality measuring device includes a working platform 1, a supporting frame 3 is provided on the working platform 1, a power guide mechanism 4 is installed on the supporting frame 3, the power guide mechanism 4 includes a supporting frame 43 installed on the supporting frame 1, a vertical guide rail 44 is installed in the supporting frame 43, the bottom of the vertical guide rail 44 is fixed on the supporting frame 3, a slide is slidably connected to the vertical guide rail 44, a stepper motor 45 for driving the slide to slide up and down is provided on the top of the supporting frame 43, the stepper motor 45 is connected to the slide through a stepper belt, one end of the stepper belt is wound around the output shaft of the stepper motor 45, and the other end is fixed to the top of the slide, and the probe mechanism 2 is installed on the slide.

[0021] In order to ensure that the slide seat slides up and down more stably and reliably, one side of the vertical guide rail 44 is a plane side 410, and a vertical slide groove 46 is provided on the side opposite to the plane side 410; the slide seat includes a slide frame 47, on which a slider slidably connected to the vertical slide groove 46 is provided, and on the slide frame 47 are two arms 42, between the ends of the two arms 42 there is a support shaft 48, on the support shaft 48 there is a roller 49 rotatably connected, and the roller 49 abuts against the plane side 410 to limit the slide frame 47 from sliding on the vertical guide rail 44. Among them, the two arms 42 can also be slidably connected to the vertical guide rail 44 to further increase the stability of the overall sliding of the slide seat and the accuracy of vertical sliding, and ensure the sliding of the slide seat in the vertical direction.

[0022] Place the workpiece to be inspected on the work platform 1, let the spherical probe 21 be located in the inner hole of the workpiece, then gently push the workpiece to be inspected to touch the spherical side head, and appropriately press the spherical probe 21. When the first grating displacement sensor displays about 800.0 microns, click reset to find the zero position of the measurement. At this time, under the action of the self-gravity of the slide plate 25 and the vertical push rod 26, they press on the horizontal swing arm 27 to ensure that the spherical side head of the spherical probe 21 is lightly pressed on the inner hole wall; then start the stepper motor 45 to pull the slide seat and the probe mechanism 2 as a whole to move slowly upward through the stepper pull belt. During the movement, the spherical side head of the spherical probe 21 always contacts the inner hole wall of the workpiece. When the inner hole wall tilts slightly, the vertical swing arm 22 is pushed to swing. The vertical swing arm 22 drives the horizontal swing arm 27 to move up and down, thereby pushing the vertical push rod 26 and the slide plate 25 to move up and down together. The upward movement is detected by the first grating displacement sensor and the tilt parameter of the inner hole wall is finally converted.

[0023] In addition, based on the detection data of the first grating displacement sensor and the second grating displacement sensor, the tilt parameters at the corresponding height of the inner hole wall can be obtained, so that the contour of the inner hole can be simulated by measuring at different circumferential positions, so that a comprehensive parameter evaluation of the verticality of the inner hole and the entire inner hole shape can be performed.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A probe mechanism for measuring the verticality of an aperture comprises a vertical connecting plate, a sliding plate is slidably connected to the vertical connecting plate, a grating displacement sensor for detecting the upward and downward sliding displacement of the sliding plate is arranged between the sliding plate and the vertical connecting plate, a vertical push rod is arranged at the bottom of the sliding plate, a rotating shaft is rotatably connected to the bottom of the vertical connecting plate, a vertical swing arm is fixed on the rotating shaft, a spherical probe is arranged at the bottom of the vertical swing arm, a horizontal swing arm perpendicular to the vertical swing arm is fixed on the rotating shaft, and the bottom of the vertical push rod abuts against the horizontal swing arm.

2. The aperture verticality measuring head mechanism according to claim 1, characterized in that: The length of the vertical swing arm is greater than that of the horizontal swing arm.

3. The aperture verticality measuring head mechanism according to claim 2, characterized in that: The length of the vertical swing arm is greater than 10 times the length of the horizontal swing arm.

4. The aperture verticality measuring head mechanism according to any one of claims 1 to 3, characterized in that: The end of the vertical push rod is a spherical end, and a groove is provided on the horizontal swing arm, and the spherical end rests in the groove.

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