Plunger ball center distance testing fixture

Abstract

The utility model relates to a plunger ball center distance testing fixture. The testing fixture comprises a base, a first positioning mechanism, a second positioning mechanism and a measuring instrument. The first positioning mechanism is fixed on the base and is configured to be used for positioning the first ball head; the first positioning mechanism is constructed to be located in the extending direction of the plunger; the second positioning mechanism is arranged on the base in a guiding fit mode through a linear guide rail and is configured to be used for positioning a second ball head. And the measuring part of the measuring instrument is configured to measure the position of the second positioning mechanism on the linear guide rail. The plunger is positioned more accurately and stably through the first positioning mechanism, the second positioning mechanism is matched on the linear guide rail, the second positioning mechanism can move on the linear guide rail in a high-precision and flexible mode, and the size of the plunger ball center distance is clearly reflected on a measuring instrument through the change of the distance between the first positioning mechanism and the second positioning mechanism. And the detection precision and the detection efficiency of the plunger ball center distance are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of tooling and inspection tools, and in particular to an inspection tool for detecting the distance between plunger ball centers. Background Art

[0002] The plunger is an important part of the pump body. The precision of plunger processing has a great impact on the operation of the pump body. In the existing technology, the distance between the centers of two solid balls is mostly measured by three-coordinate measurement and imaging measurement. However, the size of the ball center distance measured by the three-coordinate measuring machine and imaging is greatly affected by the structural size and surface roughness of the measured ball, and the detection efficiency is not high. Therefore, it is particularly important to find a plunger ball center distance inspection tool with high detection efficiency and detection accuracy. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the present disclosure provides a plunger ball center distance inspection tool.

[0004] According to a first aspect of the present disclosure, a plunger ball center distance inspection tool is provided, wherein the plunger has a first ball head and a second ball head at both ends, comprising:

[0005] Pedestal;

[0006] a first positioning mechanism, the first positioning mechanism being fixed on the base and configured to position the first ball head;

[0007] A second positioning mechanism, wherein the second positioning mechanism and the first positioning mechanism are configured to be located in the extension direction of the plunger; the second positioning mechanism is matched on the base through a linear guide rail and is configured to position the second ball head;

[0008] A measuring instrument, wherein a measuring portion of the measuring instrument is configured to measure a position of the second positioning mechanism on the linear guide rail.

[0009] In one embodiment of the present disclosure, the first positioning mechanism includes two first supporting parts arranged in parallel, and the side walls opposite to each other at the upper ends of the two first supporting parts are constructed to have surfaces matched with the first ball head.

[0010] In one embodiment of the present disclosure, the first positioning mechanism includes a first mounting seat fixed on the base, and the two first supporting portions are configured to be disposed on the first mounting seat and configured to extend upward from the first mounting seat.

[0011] In one embodiment of the present disclosure, the top of the second positioning mechanism is configured as a surface that matches a corresponding surface of the second ball head.

[0012] In one embodiment of the present disclosure, the second positioning mechanism includes a second mounting seat, and a second supporting portion arranged on the top of the second mounting seat, and a surface at the upper end of the second supporting portion is constructed to be a surface adapted to a corresponding surface of the second ball head.

[0013] In one embodiment of the present disclosure, the second support portion is configured to extend upward from the second mounting seat, and the second support portion is configured to be annular; the inner wall of the top of the second support portion is configured to be an arc surface that matches the corresponding surface of the second ball head.

[0014] In one embodiment of the present disclosure, the second ball head includes an axial surface located in the middle and spherical surfaces located on both sides of the axial surface; the inner wall of the top of the second support portion is constructed as an arc surface for matching with the spherical surface in the second ball head.

[0015] In one embodiment of the present disclosure, the linear guide rail includes a slide rail and a slider guided and matched on the slide rail, and the second positioning mechanism is arranged on the slider;

[0016] A limit seat is arranged on the base, and the limit seat is configured to be located in the moving path of the second positioning mechanism; and the measuring instrument is configured to be installed on the limit seat.

[0017] In one embodiment of the present disclosure, the measuring instrument includes a display dial and a test rod, wherein the test rod is configured to extend from the display dial toward the second positioning mechanism and is configured to abut against the second positioning mechanism.

[0018] In one embodiment of the present disclosure, a measurement standard is included, and the measurement standard is configured to be placed on the first positioning mechanism and the second positioning mechanism to reset the display dial to zero.

[0019] One beneficial effect of the present disclosure is that the present disclosure accurately positions the first ball head of the plunger through the first positioning mechanism fixed on the bottom, and is matched with the second ball head of the plunger through the second positioning mechanism; the second positioning mechanism is matched with the linear guide rail, and can be moved on the slide rail with high precision and flexibility. The first and second positioning mechanisms are respectively matched with the first and second ball heads, so that the positioning of the plunger is more accurate and stable. The plunger ball center distance gauge of the present disclosure has a simple structure, low production cost, low difficulty in machining the positioning surface of the positioning element, strong applicability, and accurate and fast positioning. In addition, the dimensional change of the plunger ball center distance can be reflected on the measuring instrument through the high-precision movement of the second positioning mechanism on the linear guide rail, which effectively improves the detection efficiency and detection accuracy.

[0020] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] Figure 1 It is a structural schematic diagram of the plunger ball center distance inspection tool disclosed in the present invention;

[0023] Figure 2 1 is a top view schematic diagram of the plunger ball center distance inspection fixture disclosed in the present invention;

[0024] Figure 3 is a cross-sectional schematic diagram of the first positioning mechanism disclosed in the present invention;

[0025] Figure 4 is a side schematic diagram of the first positioning mechanism of the present disclosure;

[0026] Figure 5 is a cross-sectional schematic diagram of the second positioning mechanism of the present disclosure;

[0027] Figure 6 is a top view schematic diagram of the second positioning mechanism of the present disclosure;

[0028] Figure 7 is a schematic diagram of the mechanism of the disclosed base;

[0029] Figure 8 is a cross-sectional schematic diagram of the disclosed limit seat;

[0030] Fig. 9 It is a schematic diagram of the structure of the measurement standard component disclosed in the present invention.

[0031] Figures 1 to 9 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0032] 1. Base; 2. First positioning mechanism; 21. First supporting portion; 22. First mounting seat; 3. Second positioning mechanism; 31. Second supporting portion; 32. Second mounting seat; 4. Linear guide rail; 41. Slide rail; 42. Slider; 5. Limit seat; 6. Measuring instrument; 61. Display dial; 62. Test connecting rod; 7. First ball head; 8. Second ball head; 81. Axial surface; 82. Spherical surface; 9. Measuring standard parts. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0036] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0038] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0039] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0040] The present invention provides a plunger ball center distance detection tool, which is mainly used to detect the ball center distance of the plunger. The plunger is provided with a first ball head and a second ball head at both ends, respectively. The first ball head and the second ball head can be arranged at the end of the plunger or at a position adjacent to the end, etc., which is not limited here.

[0041] The plunger ball center distance gauge includes: a base, a first positioning mechanism, a second positioning mechanism, and a measuring instrument. The base is arranged at the bottom of the plunger ball center distance gauge, and other components can be installed on the base; the first positioning mechanism is constructed to cooperate with the first ball head, and the first positioning mechanism is fixedly installed on the base; the second positioning mechanism is guided on the base by a linear guide rail, and is constructed to be used for positioning the second ball head, and the linear guide rail is fixedly installed on the base; the measuring part of the measuring instrument is constructed to measure the position of the second positioning mechanism on the linear guide rail. The dimensional change of the plunger ball center distance can be clearly reflected on the measuring instrument through the distance between the first and second positioning mechanisms, thereby improving the detection accuracy and efficiency of the plunger ball center distance.

[0042] In the prior art, the size of the plunger ball center distance cannot be directly measured by conventional measuring instruments such as vernier calipers and height gauges, but is generally measured by a three-dimensional coordinate measuring machine or an imaging device. However, since the structural length size of the first ball head of the plunger is much smaller than its own diameter size, and the first and second ball heads of the plunger themselves have shape errors and different surface roughnesses, there will be large measurement errors in measuring the center position of the ball head using a three-dimensional coordinate measuring machine and an imaging device.

[0043] The present invention positions the first ball head and the second ball head of the plunger by means of a first positioning mechanism and a second positioning mechanism arranged in the extension direction of the plunger. The first positioning mechanism is fixed on the base, and the second positioning mechanism is matched on the base through a linear guide rail, so that the second positioning mechanism can adjust its position on the base according to the position of the second ball head, and finally the position of the second positioning mechanism on the linear guide rail can be detected by the measuring part of the measuring instrument.

[0044] The measuring instrument disclosed in the present invention can directly measure the position of the second positioning mechanism, thereby directly obtaining the data of the ball center distance of the plunger. Alternatively, the measuring instrument can be calibrated in advance using a standard plunger and then measured, at which time the measuring instrument can obtain the dimensional deviation of the plunger to be tested. Using this comparison method to measure the plunger can improve the efficiency and accuracy of the measurement.

[0045] The inspection tool disclosed in the present invention accurately positions the first ball head of the plunger through the first positioning mechanism. In addition, since the second positioning mechanism is guided and matched on the linear guide rail, the second positioning mechanism can be moved on the linear guide rail with high precision and flexibility. Then, the second positioning mechanism is moved on the linear guide rail, so that the second ball head has good contact at the second positioning mechanism. At this time, the measured value of the plunger ball center distance can be obtained from the measuring instrument. The indication of the measuring instrument can clearly reflect the change of the plunger ball center distance, that is, the error size of the plunger ball center distance relative to the measurement standard part, and then determine the size of the plunger ball center distance, which effectively improves the detection efficiency and detection accuracy. In addition, the plunger ball center distance inspection tool disclosed in the present invention is a comparative measurement inspection tool, and also has the advantages of simple structure, low production cost and strong applicability.

[0046] The specific embodiments of the present disclosure are described below in conjunction with the accompanying drawings.

[0047] In one embodiment of the present disclosure, Figure 1 , Figure 7 The present disclosure provides a plunger ball center distance inspection tool, comprising: a base 1, a first positioning mechanism 2, a second positioning mechanism 3, and a measuring instrument 6. The plunger is provided with a first ball head 7 and a second ball head 8 along its axial direction, and the distance between the two ball heads is an important indicator for calibrating whether the plunger is qualified. Among them, the base 1 is the installation base of the inspection tool and provides a stable support for the inspection tool. Other components on the inspection tool are constructed to be installed on the base 1.

[0048] The first positioning mechanism 2 is fixed on the base 1 and is constructed to position the first ball head 7; the second positioning mechanism 3 and the first positioning mechanism 2 are constructed to be located in the extension direction of the plunger; the second positioning mechanism 3 is guided and fitted on the base 1 through the linear guide 4, and is constructed to position the second ball head 8, and the second positioning mechanism 3 is constructed to be able to move with high precision on the linear guide 4; the measuring part of the measuring instrument 6 is constructed to measure the position of the second positioning mechanism 3 on the linear guide 4, and the measuring instrument 6 contacts the second positioning mechanism 3 in the moving direction of the second positioning mechanism 3.

[0049] In the prior art, since the structural length dimension of the first ball head of the plunger is much smaller than its own diameter dimension, and the first and second ball heads of the plunger themselves have shape errors and different surface roughnesses, there is a large measurement error in measuring the plunger ball center distance using a three-coordinate measuring machine and an imager.

[0050] In the present disclosure, the first ball head 7 of the plunger can be accurately positioned by the first positioning mechanism 2 fixed on the base 1, and the second positioning mechanism 3 positions the second ball head 8 of the plunger, and the second positioning mechanism 3 is guided and matched on the linear guide 4, and the second positioning mechanism 3 is moved on the linear guide 4 with high precision and flexibility, so that the second positioning mechanism 3 can adjust its position on the base 1 according to the position of the second ball head 8 on the plunger. Specifically, when in use, the second positioning mechanism 3 can adapt its position on the base 1 according to the position of the second ball head 8, so that the second ball head 8 has good contact at the second positioning mechanism 3, ensuring that the second ball head 8 is accurately positioned by the second positioning mechanism 3, and the measured value of the plunger ball center distance is obtained from the measuring instrument 6. The size of the plunger ball center distance is clearly reflected on the measuring instrument 6 through the change in the distance between the first positioning mechanism 2 and the second positioning mechanism 3, which effectively improves the plunger ball center distance detection accuracy and detection efficiency, and compared with the prior art, the plunger ball center distance gauge disclosed in the present disclosure is more applicable. In addition, the components of the plunger ball center distance gauge are simple in structure, which reduces the production cost.

[0051] The measuring instrument 6 disclosed in the present invention can directly measure the position of the second positioning mechanism 3, thereby directly obtaining the data of the spherical center distance of the plunger. Alternatively, the measuring instrument 6 can be calibrated in advance using a standard plunger and then measured, at which time the measuring instrument 6 can obtain the dimensional deviation of the plunger to be tested. Using this comparison method to measure the plunger can improve the efficiency and accuracy of the measurement.

[0052] In one embodiment of the present disclosure, Figure 3 The first positioning mechanism 2 includes two first supporting portions 21 arranged in parallel, and the side walls opposite to the upper ends of the two first supporting portions 21 are constructed to have surfaces adapted to the first ball head 7 .

[0053] Specifically, the first support portion 21 is mounted on the base 1 and is configured to extend upward from the base 1. The two first support portions 21 are arranged in parallel and at intervals, so that the two first support portions 21 can respectively support the opposite sides of the first ball head 7. In order to position the first ball head 7 on the two first support portions 21, the inner walls on the opposite sides of the upper end of the first support portion 21 are configured to have surfaces that match the first ball head 7. That is, the first ball head 7 is supported on the upper ends of the two first support portions 21, so the upper end of the first support portion 21 for matching with the first ball head 7 is configured to be a surface that matches the first ball head 7. For example, when the outer surface of the first ball head 7 is a cylindrical surface as a whole, the upper end of the first support portion 21 is configured to be an arc surface that matches it. When the cylindrical surface of the first ball head 7 has an arc in the axial direction, the upper end of the first support portion 21 also needs to match it and be configured to be in a shape similar to a ball socket. The first support parts 21 on both sides can support the first ball head 7 on both sides, and can also limit the first ball head 7 in the axial direction, thereby finally achieving the radial and axial positioning of the first ball head 7.

[0054] The surface of the first positioning mechanism 2 may be formed by turning, or by a method well known to those skilled in the art, which is not limited here.

[0055] Since the length of the first ball head 7 of the plunger is much smaller than its diameter, the difficulty of positioning the first ball head 7 in the length direction increases, and the two first support parts 21 arranged in parallel can be matched with the first ball head 7. Since the surface of the first support part 21 has a surface matched with the first ball head 7 after milling, the first positioning mechanism 2 can position the first ball head 7 more accurately. In addition, since the surface of the first positioning mechanism 2 is formed by turning, compared with the prior art, the difficulty of machining the positioning surface of the first positioning mechanism 2 is low, which can reduce the production cost.

[0056] In one embodiment of the present disclosure, Figure 3 , Figure 4 The first positioning mechanism 2 includes a first mounting seat 22 fixed on the base 1, and two first support portions 21 are configured to be arranged on the first mounting seat 22, and are configured to extend upward from the first mounting seat 22. The first mounting seat 22 is provided with a screw hole, and the first mounting seat 22 can be mounted on the base 1 by means of screw holes, bolts, and other methods well known to those skilled in the art, thereby realizing the installation of the first support portion 21 on the base 1 through the first mounting seat 22. The first support portion 21 and the first mounting seat 22 disclosed in the present invention can be integrally formed, or can be detachably connected by assembly. Therefore, the measurement of plungers of different specifications can be realized by replacing different first support portions 21, thereby improving the versatility of the inspection fixture.

[0057] In one embodiment of the present disclosure, Figure 5 , the top of the second positioning mechanism 3 is constructed as a surface that matches the corresponding surface of the second ball head 8. Based on the same principle as the first positioning mechanism 2, the second positioning mechanism 3 is used to position the second ball head 8 in the axial and radial directions. Therefore, the position of the top of the second positioning mechanism 3 that is used to match the second ball head 8 has a surface that matches at least part of the surface of the second ball head 8. That is, when the second ball head 8 is a cylindrical surface, the top of the second positioning mechanism 3 is constructed as an arc surface to match the cylindrical surface of the second ball head 8. When the second ball head 8 is spherical, the top of the second positioning mechanism 2 is constructed as a ball-and-socket structure to match the second ball head 8.

[0058] In a specific embodiment of the present disclosure, the second ball head 8 of the plunger has a spherical surface, and a ball socket structure adapted to the second ball head 8 is provided at the top of the second positioning mechanism 3. That is, the contact surface between the second ball head 8 of the plunger and the second positioning mechanism 3 is a partial spherical surface, and due to the effect of the curved surface tension and gravity, it is helpful for the second ball head 8 to be automatically centered at the top of the second positioning mechanism 3, which helps to improve the positioning accuracy of the second positioning mechanism 3.

[0059] In one embodiment of the present disclosure, Figure 5 , Figure 6 The second positioning mechanism 3 includes a second mounting seat 32 and a second supporting portion 31 arranged on the top of the second mounting seat 32 , and the surface of the upper end of the second supporting portion 31 is constructed to be a surface adapted to the corresponding surface of the second ball head 8 .

[0060] Similar to the first positioning mechanism 2, in the second positioning structure 3, the second support portion 31 is constructed to extend upward from the second mounting seat 32, and the second mounting seat 32 is provided with a screw hole, and the second mounting seat 32 can be mounted on the linear guide rail 4 by means of screw holes, bolts, etc., which are well known to those skilled in the art, thereby realizing the installation of the second support portion 31 on the linear guide rail 4 through the second mounting seat 32. This allows the second positioning structure 3 to move along the extension direction of the linear guide rail 4 under the action of the linear guide rail 4, thereby adjusting the position of the second positioning structure 3 on a straight line.

[0061] The second support part 31 and the second mounting seat 32 of the present disclosure may be integrally formed or detachably connected by assembly, so that different specifications of plungers can be measured by replacing different second support parts 31, thereby improving the versatility of the gauge.

[0062] In one embodiment of the present disclosure, the second support portion 31 is constructed to be annular, and the inner wall of the top of the second support portion 31 is constructed to be an arc surface that matches the corresponding surface of the second ball head 8. Since the second positioning mechanism 3 is movably connected to the base 1, when performing the test, the contact surface between the second positioning structure 3 and the second ball head 8 is as large as possible, so that when the second ball head 8 is pressed down and contacts the second positioning structure 3, under the action of the relevant contact force, the second positioning structure 3 can be smoothly moved on the base 1 to be centered with the second ball head 8. The second positioning structure 3 of this structure is suitable for positioning a ball head with a spherical arc surface.

[0063] Specifically, refer to Fig. 9 , the second ball head 8 includes an axial surface 81 located in the middle, and spherical surfaces 82 located on both sides of the axial surface 81. Of course, the second ball head 8 can also be spherical as a whole. The inner wall at the top of the second support portion 31 is constructed as an arcuate surface for matching with the spherical surface 82 in the second ball head 8. That is, the second support portion 31 is annular in structure as a whole, and an arcuate surface structure matching with the spherical surface 82 is provided on the inner wall at the top, which can also be said to be a structure similar to a ball socket. During detection, the second support portion 31 can be manually moved to a position below the second ball head 8. After the second ball head 8 is pressed down, under the contact force of the spherical surface 82, the second ball head 8 can drive the second positioning structure 3 to move on the base 1 until the second ball head 8 and the second support portion 31 are centered.

[0064] In one embodiment of the present disclosure, Figure 1 , Figure 2 The linear guide rail 4 includes a slide rail 41 and a slider 42 which is guided and matched on the slide rail 41. The second positioning mechanism 3 is arranged on the slider 42. The second positioning mechanism 3 is configured to be provided with a fixing screw hole, and the second positioning mechanism 3 is configured to be fixedly connected with the slider 42 through the fixing screw hole, and the slider 42 is configured to be able to slide on the slide rail 41. Figure 8 A limit seat 5 is provided on the base 1 , and the limit seat 5 is configured to be located in the moving path of the second positioning mechanism 3 ; and a measuring instrument 6 is configured to be installed on the limit seat 5 .

[0065] The slider 42 guided on the slide rail 41 can slide on the slide rail 41, and the second positioning mechanism 3 is fixedly connected to the slider 42 through a fixing screw hole, which provides a guarantee for the second positioning mechanism 3 to move on the linear guide rail 4 with high precision and flexibility. When working, the second positioning mechanism 3 moves on the slide rail 41 with high precision through the slider 42, so that the second ball head 8 is well adapted to the second positioning mechanism 3, which helps to improve the detection efficiency and detection accuracy of the plunger ball center distance. The limit seat 5 is located in the moving path of the second positioning mechanism 3, which enables the limit seat 5 to provide a limit for the movement of the second positioning mechanism 3, that is, when the second positioning structure 3 moves a predetermined distance in the direction of the limit seat 5, it contacts the limit seat 5.

[0066] The measuring instrument 6 can be installed on the limit seat 5 to measure the moving second positioning structure 3. The measuring part of the measuring instrument 6 can be directly moved to contact with the second positioning structure 3, for example, contact with the second support part 31 or contact with the second mounting seat 32, and the position of the second positioning structure 3 can be measured. In the above embodiment, the measuring part of the measuring instrument 6 can also contact with the slider 42, and the distance data representing the position of the second positioning structure 3 can also be obtained, which will not be described in detail here.

[0067] In one embodiment of the present disclosure, Figure 2 The measuring instrument 6 includes a display dial 61 and a test connecting rod 62 . The test connecting rod 62 is configured to extend from the display dial 61 toward the second positioning mechanism 3 and is configured to abut against the second positioning mechanism 3 .

[0068] Specifically, refer to Figure 2 The measuring instrument 6 can be fixed on the limit seat 5 by bolts, and abut against the second positioning mechanism 3 through the test connecting rod 62. When the second positioning mechanism 3 moves on the linear guide 4 to adapt to the second ball head 8, the test connecting rod 62 can be extended or shortened, thereby changing the indication of the display dial 61, thereby determining the size of the plunger ball center distance. The test instrument 6 ensures measurement accuracy, and has a simple structure, low production cost, and strong applicability.

[0069] In one embodiment of the present disclosure, Fig. 9 The plunger ball center distance gauge includes a measurement standard 9, which is configured to be placed on the first positioning mechanism 2 and the second positioning mechanism 3 to zero the display dial 61. The measurement standard 9 is used to calibrate the display dial 61, which enables the gauge of the present disclosure to measure the plunger using a comparison method.

[0070] Specifically, firstly, the first ball head 7 of the measuring standard part 9 is positioned on the first positioning mechanism 2, and the second positioning mechanism 3 is moved to cooperate with the second ball head 8, so as to complete the positioning of the two ball heads of the measuring standard part 9 on the two positioning mechanisms. At this time, the test connecting rod 62 is matched with the second positioning structure 2, and the display dial 61 is calibrated so that the indication of the display dial 61 is 0. After the measuring standard part 9 is removed, the test plunger is placed in the above-mentioned manner. At this time, the value displayed on the display dial 61 is the error between the test plunger and the measuring standard part 9. As long as the error is within the allowable range, the plunger to be tested is a qualified part, otherwise it is an unqualified part. The inspection fixture disclosed in the present invention can directly judge whether the ball center distance of other plungers meets the requirements through the change of the indication of the display dial 61, that is, judge the error size of the plunger ball center distance of other plungers to be tested relative to the measuring standard part 9, and then determine the size of the plunger ball center distance, which effectively improves the detection efficiency and detection accuracy.

[0071] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A plunger ball center distance inspection tool, the plunger having a first ball head (7) and a second ball head (8), characterized in that: The inspection tool comprises: Base (1); A first positioning mechanism (2), the first positioning mechanism (2) being fixed on the base (1) and being configured to position the first ball head (7); A second positioning mechanism (3), wherein the second positioning mechanism (3) and the first positioning mechanism (2) are configured to be located in the extension direction of the plunger; the second positioning mechanism (3) is guided and matched on the base (1) through a linear guide rail (4), and is configured to be used for positioning the second ball head (8); A measuring instrument (6), wherein the measuring portion of the measuring instrument (6) is configured to measure the position of the second positioning mechanism (3) on the linear guide rail (4).

2. The gauge according to claim 1, characterized in that: The first positioning mechanism (2) comprises two first supporting parts (21) arranged in parallel, and the side walls opposite to each other at the upper ends of the two first supporting parts (21) are constructed to have surfaces adapted to the first ball head (7).

3. The gauge according to claim 2, characterized in that: The first positioning mechanism (2) comprises a first mounting seat (22) fixed on the base (1), and the two first supporting parts (21) are configured to be arranged on the first mounting seat (22) and to extend upward from the first mounting seat (22).

4. The gauge according to claim 1, characterized in that: The top of the second positioning mechanism (3) is constructed as a surface that matches the corresponding surface of the second ball head (8).

5. The gauge according to claim 4, characterized in that: The second positioning mechanism (3) comprises a second mounting seat (32) and a second supporting portion (31) arranged on the top of the second mounting seat (32), and the surface of the upper end of the second supporting portion (31) is constructed to be a surface that matches the corresponding surface of the second ball head (8).

6. The gauge according to claim 5, characterized in that: The second support portion (31) is configured to extend upward from the second mounting seat (32), and the second support portion (31) is configured to be annular; the inner wall of the top of the second support portion (31) is configured to be an arc-shaped surface that matches the corresponding surface of the second ball head (8).

7. The gauge according to claim 6, characterized in that: The second ball head (8) comprises an axial surface (81) located in the middle, and spherical surfaces (82) located on both sides of the axial surface (81); the inner wall of the top of the second support portion (31) is constructed as an arc surface adapted to match the spherical surface (82) in the second ball head (8).

8. The gauge according to claim 1, characterized in that: The linear guide rail (4) comprises a slide rail (41) and a slider (42) guided and matched on the slide rail (41), and the second positioning mechanism (3) is arranged on the slider (42); A limit seat (5) is arranged on the base (1), and the limit seat (5) is configured to be located in the moving path of the second positioning mechanism (3); and the measuring instrument (6) is configured to be mounted on the limit seat (5).

9. The gauge according to claim 8, characterized in that: The measuring instrument (6) comprises a display dial (61) and a test connecting rod (62), wherein the test connecting rod (62) is configured to extend from the display dial (61) in the direction of the second positioning mechanism (3) and is configured to abut against the second positioning mechanism (3).

10. The gauge according to claim 9, characterized in that: It also includes a measurement standard (9), which is configured to be placed on the first positioning mechanism (2) and the second positioning mechanism (3) to reset the display dial (61) to zero.

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