Cylinder pipe coaxiality measuring fixture

Abstract

The present invention discloses a coaxiality measuring tool for a cylinder pipe, comprising: a length measuring device, a positioning body which is cylindrical in shape as a whole, a measuring hole being provided in the middle of the positioning body, the measuring hole being coaxial with the positioning body, the positioning body also comprising a transverse hole formed therein and arranged in a horizontal direction, the transverse hole being connected with the measuring hole, a pressure head and a first compression spring being provided in the transverse hole, one end of the first compression spring abutting against the hole wall of the transverse hole, the other end of the first compression spring abutting against one end of the pressure head, the other end of the pressure head partially extending into the measuring hole, the positioning body also comprising a longitudinal hole formed therein, the longitudinal hole being formed by an end of the transverse hole away from the measuring hole extending vertically upward. The present invention aims to solve the technical problem that there is no dedicated coaxiality detection equipment in the prior art to realize convenient and quick inspection of the coaxiality of the pipe and the bearing mounting hole.

Description

Technical Field

[0001] The invention belongs to the technical field of detection tools used in a gearbox manufacturing process, and in particular relates to a cylinder pipe coaxiality measurement tool. Background Art

[0002] In the manufacturing process of the transmission, after the oil cylinder pipe is pressed, it is inconvenient to measure the coaxiality of the pipe and the bearing hole of the rear housing. There is no special coaxiality detection equipment in the prior art to conveniently and quickly check the coaxiality of the pipe and the bearing mounting hole. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] Based on this, the present invention proposes a cylinder pipe coaxiality measuring fixture, which aims to solve the technical problem that there is no dedicated coaxiality detection equipment in the prior art to conveniently and quickly check the coaxiality of the pipe and the bearing mounting hole.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention proposes a coaxiality measuring tool for a cylinder pipe, comprising: a length measuring device, a positioning body which is cylindrical as a whole, a measuring hole is provided in the middle of the positioning body, the measuring hole is coaxial with the positioning body, the positioning body also includes a transverse hole formed therein and arranged in a horizontal direction, the transverse hole is connected to the measuring hole, a pressure head and a first compression spring are provided in the transverse hole, one end of the first compression spring abuts against the hole wall of the transverse hole, the other end of the first compression spring abuts against one end of the pressure head, and the other end of the pressure head abuts against the hole wall of the transverse hole. The locating body further includes a longitudinal hole formed therein, the longitudinal hole being formed by an end of the transverse hole away from the measuring hole extending vertically upward, a connecting rod being arranged in the longitudinal hole, the surface of the connecting rod in contact with the locating body being an arc surface, the lower end of the connecting rod abutting against the pressure head, the portion of the pressure head in contact with the connecting rod being a 45° conical surface, the length measuring device including a measuring rod, the length measuring device being arranged above the longitudinal hole and the lower portion of the measuring rod abutting against the upper portion of the connecting rod, the length measuring device being a digital micrometer.

[0007] Preferably, the cylinder pipe coaxiality measuring fixture also includes a support and a table seat, the support includes a seat body and an upper connecting ear and a lower connecting ear respectively arranged at the upper and lower ends of the seat body, the seat body is provided with a measuring rod accommodating cavity passing through it, the length measuring device is fixed to the upper connecting ear by a first threaded connection piece, the table measuring rod extends into the measuring rod accommodating cavity, and the lower connecting ear is fixed to the positioning body by a second threaded connection piece.

[0008] Preferably, the connecting rod includes a first shaft and a second shaft connected to each other, the diameter of the second shaft is larger than that of the first shaft, a limit step is formed at the connection between the first shaft and the second shaft, and the cylinder pipe coaxiality measuring fixture also includes a second compression spring, one end of the second compression spring abuts against the limit step, and the other end of the second compression spring abuts against the lower part of the lower connecting ear, and the first shaft passes through the second compression spring.

[0009] Preferably, the oil cylinder pipe coaxiality measuring jig further comprises a handle fixed to the top of the positioning body via a third threaded connector; the handle is arranged opposite to the length measuring device.

[0010] Preferably, a limit groove formed by a groove is provided above the pressure head, and the cylinder pipe coaxiality measuring fixture also includes a limit pin, one end of the limit pin is fixed to the positioning body, and the other end of the limit pin extends into the limit groove.

[0011] Preferably, the bottom of the positioning body is in an annular shape as a whole, and the outer side surface of the bottom of the positioning body is a conical surface that is larger at the top and smaller at the bottom.

[0012] Preferably, when forming the transverse hole, the side of the positioning body is first drilled in to form a basic hole, and then the end of the basic hole away from the measuring hole is blocked with a plug to form the transverse hole.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the beneficial effects of the oil cylinder pipe coaxiality measuring fixture of the present invention mainly include:

[0015] Compared with the prior art, the oil cylinder pipe coaxiality measuring jig of the present invention is specially used to measure the coaxiality of the pipe and the bearing mounting hole, making the measurement of coaxiality simpler and faster, easy to operate, and convenient for quickly and accurately measuring the coaxiality in production. During detection, the oil cylinder pipe coaxiality measuring jig of the present invention is placed into the housing hole. At this time, the pressure head contacts the oil cylinder pipe, the micrometer is reset, and the oil cylinder pipe coaxiality measuring jig of the present invention is pushed to rotate one circle as a whole. The coaxiality of the oil cylinder pipe and the rear housing bearing hole can be obtained through the change in the micrometer reading. Through the above structure, the coaxiality can be measured conveniently and quickly, the operation is simple, and it is convenient to quickly and accurately measure the coaxiality of the pipe and the bearing mounting hole in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0017] Figure 1It is a schematic diagram of the overall structure of the oil cylinder pipe coaxiality measuring fixture according to the embodiment of the present invention;

[0018] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 This is a diagram of the use state of the oil cylinder pipe coaxiality measurement jig according to the embodiment of the present invention;

[0020] Figure 4 It is a front view of a positioning body in a cylinder pipe coaxiality measuring fixture according to an embodiment of the present invention;

[0021] Figure 5 A top view of a positioning body in a cylinder pipe coaxiality measuring fixture according to an embodiment of the present invention;

[0022] Figure 6 It is a front view of the pressure head in the oil cylinder pipe coaxiality measurement inspection fixture according to the embodiment of the present invention;

[0023] Figure 7 for Figure 6 Partial view from the center B direction.

[0024] Description of reference numerals:

[0025] 1. Second threaded connector, 2. Pressure head, 3. First compression spring, 4. Plug, 5. Limit pin, 6. Connecting rod, 7. Second compression spring, 8. Positioning body, 9. Support, 10. First threaded connector, 11. Micrometer, 12. Diameter base, 13. Handle, 14. Third threaded connector, 21. Limiting groove, 61. First axis, 62. Second axis, 81. Measuring hole, 82. Transverse hole, 83. Longitudinal hole, 91. Base body, 92. Upper connecting ear, 93. Lower connecting ear, 111. Measuring rod, 911. Measuring rod receiving chamber, 15. Pipe connection, 16. Bearing hole. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements, or it can be a "transmission connection", that is, a power connection through various appropriate methods such as belt drive, gear drive or sprocket drive. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Reference Figure 1-7 A coaxiality measuring tool for a cylinder pipe includes: a length measuring device, a positioning body 8 which is cylindrical as a whole, the length measuring device is a micrometer 11, a measuring hole 81 is provided in the middle of the positioning body 8, the measuring hole 81 is coaxial with the positioning body 8, the positioning body 8 also includes a horizontal hole 82 formed therein and arranged in the horizontal direction, the horizontal hole 82 is connected with the measuring hole 81, a pressure head 2 and a first compression spring 3 are provided in the horizontal hole 82, one end of the first compression spring 3 abuts against the hole wall of the horizontal hole 82, and the other end of the first compression spring 3 abuts against the hole wall of the horizontal hole 82. One end of the pressure head 2 is connected, and the other end of the pressure head 2 partially extends into the measuring hole 81. The positioning body 8 also includes a longitudinal hole 83 formed therein. The longitudinal hole 83 is formed by an end of the transverse hole 82 that is away from the measuring hole 81 and vertically extends upward. A connecting rod 6 is provided in the longitudinal hole 83. The lower end of the connecting rod 6 abuts against the pressure head 2. The portion of the pressure head 2 that contacts the connecting rod 6 is a 45° cone surface. The micrometer 11 includes a measuring rod 111. The micrometer 11 is arranged above the longitudinal hole 83 and the lower part of the measuring rod 111 abuts against the upper part of the connecting rod 6.

[0029] In this embodiment, the coaxiality measuring fixture of the oil cylinder pipe of the present invention is specially used to measure the coaxiality of the pipe 15 and the bearing mounting hole. During the inspection, the positioning body 8 is matched with the rear housing bearing hole 16 to be inspected, and the coaxiality measuring fixture of the oil cylinder pipe of the present invention is placed in the housing hole. At this time, the pressure head 2 contacts the oil cylinder pipe 15, the micrometer 11 is cleared, and the coaxiality measuring fixture of the oil cylinder pipe of the present invention is pushed to rotate one circle as a whole. Since the contact part of the pressure head 2 with the connecting rod 6 is a 45° cone surface, the connecting rod 6 contacts the pressure head 2, so the distance moved by the pressure head 2 in the horizontal direction is equivalently converted into the distance moved by the connecting rod 6 in the vertical direction. The upper end of the connecting rod 6 contacts the measuring rod 111 of the micrometer 11, and the coaxiality of the oil cylinder pipe 15 and the rear housing bearing hole 16 can be obtained by the change of the reading of the micrometer 11. Through the above structure, the coaxiality can be measured conveniently and quickly, the operation is simple, and it is convenient to quickly and accurately measure the coaxiality of the pipe 15 and the bearing mounting hole in production.

[0030] According to a specific embodiment of the present invention, the surface where the connecting rod 6 contacts the positioning body 8 is an arc surface. This structure is conducive to improving the contact accuracy, and at the same time, it is conducive to the force applied to the positioning body 8 to be smoothly transmitted to the connecting rod 6, effectively avoiding jamming.

[0031] According to a specific embodiment of the present invention, the cylinder pipe coaxiality measuring fixture also includes a support 9 and a gauge seat 12. The support 9 includes a seat body 91 and an upper connecting ear 92 and a lower connecting ear 93 respectively arranged at the upper and lower ends of the seat body 91. The seat body 91 is provided with a measuring rod accommodating cavity 911 passing through it. The micrometer 11 is fixed to the upper connecting ear 92 by a first threaded connection 10, and the measuring rod 111 extends into the measuring rod accommodating cavity 911. The lower connecting ear 93 is fixed to the positioning body 8 by a second threaded connection 1.

[0032] The dial gauge 11 is effectively fixed by the dial base 12 , and the dial base 12 is effectively fixed by manufacturing a measuring rod receiving cavity 911 for protecting the measuring rod 111 .

[0033] According to a specific embodiment of the present invention, the connecting rod 6 includes a first shaft 61 and a second shaft 62 connected to each other, the diameter of the second shaft 62 is larger than the first shaft 61, and a limit step is formed at the connection between the first shaft 61 and the second shaft 62. The oil cylinder pipe coaxiality measuring fixture also includes a second compression spring 7, one end of the second compression spring 7 abuts against the limit step, and the other end of the second compression spring 7 abuts against the lower part of the lower connecting ear 93, and the first shaft 61 passes through the second compression spring 7. The second compression spring 7 is used to facilitate the resetting of the connecting rod 6. Otherwise, if the resetting is achieved by gravity alone, the resetting may be delayed or stuck. The second compression spring 7 can also improve the stability of the connecting rod 6 when it slides, which is conducive to improving the measurement accuracy of the micrometer.

[0034] According to a specific embodiment of the present invention, the oil cylinder pipe coaxiality measuring fixture further includes a handle 13 fixed to the top of the positioning body 8 through a third threaded connector 14; the handle 13 is arranged opposite to the micrometer 11. In this embodiment, the handle 13 is used to push the handle 13 to make the fixture rotate as a whole. The structure and position setting of the handle 13 facilitate operation during detection and improve the convenience of operation.

[0035] According to a specific embodiment of the present invention, a limit groove 21 formed by a groove is provided above the pressure head 2, and the oil cylinder pipe coaxiality measuring fixture also includes a limit pin 5, one end of the limit pin 5 is fixed to the positioning body 8, and the other end of the limit pin 5 extends into the limit groove 21. The left and right movement position of the pressure head 2 is limited by the limit pin. It should be noted that the length of the limit groove 21 needs to ensure the stroke of the pressure head 2 when it moves left and right. One end of the pressure head 2 is also provided with a spring receiving chamber formed by a depression, and the other end of the first compression spring 3 is received in the spring receiving chamber, so that the first compression spring 3 can stably abut against one end of the pressure head 2.

[0036] According to a specific embodiment of the present invention, the bottom of the positioning body 8 is annular as a whole, and the outer side surface of the bottom of the positioning body 8 is a conical surface that is larger at the top and smaller at the bottom. In this embodiment, the bottom of the positioning body 8 is annular and the outer side surface of the bottom of the positioning body 8 is a conical surface that is larger at the top and smaller at the bottom, which can reduce the contact area between the positioning body 8 and the object to be measured, ensure the flexibility of the overall rotation, and avoid over-positioning.

[0037] According to a specific embodiment of the present invention, when forming the transverse hole 82, a basic hole is first drilled from one side of the positioning body 8, and then the end of the basic hole away from the measuring hole 81 is blocked with a plug 4 to form the transverse hole 82. This structure is conducive to reducing the difficulty of forming the transverse hole 82.

[0038] According to a specific embodiment of the present invention, the micrometer 11 is a digital micrometer. Of course, it should be noted that: depending on the required measurement accuracy, the micrometer 11 can also be replaced by a dial indicator.

[0039] More specifically, in the above-mentioned embodiment: the model of the first compression spring 3 is: cylindrical helical compression spring Y10.5×2.5×17×1, and the model of the second compression spring 7 is: cylindrical helical compression spring Y10.5×7×20×1. The first threaded connector 10 is: hexagon socket head screw M4×8, and the second threaded connector 1 and the third threaded connector 14 have the same structure, both of which are: hexagon socket head screw M4×10. During specific installation, the plug 4 is installed into the positioning body 8, and the plug 4 is used to limit the position of the cylindrical helical compression spring Y10.5×2.5×17×1. The pressure head 2 is installed into the positioning body 8, one end of which contacts the cylindrical helical compression spring Y10.5×2.5×17×1, and the cylindrical helical compression spring Y10.5×7×20×1 is inserted into the connecting rod 6, and then vertically installed into the positioning body 8, and the bottom of the connecting rod 6 contacts the pressure head 2. The support 9 is connected to the positioning body 8 by three hexagon socket head screws M4×10, and the dial base 12 is fixed to the support 9 by three hexagon socket head screws M4×8. The handle 13 is fixed to the positioning body 8 by two hexagon socket head screws M4×10. The lower end of the digital micrometer contacts the connecting rod 6 and is fixed by the dial base 12.

[0040] Compared with the prior art, the present invention is a kind of oil cylinder pipe coaxiality measuring and checking fixture specially used for measuring the coaxiality of the pipe and the bearing mounting hole. During the inspection, the positioning body is matched with the rear housing bearing hole to be inspected, and the present invention is placed in the housing hole. At this time, the pressure head contacts the oil cylinder pipe, the micrometer is reset, and the present invention is pushed to rotate the oil cylinder pipe coaxiality measuring and checking fixture as a whole. Since the contact part of the pressure head with the connecting rod is a 45° cone surface, the connecting rod is in contact with the pressure head, so the distance moved by the pressure head in the horizontal direction is equivalently converted into the distance moved by the connecting rod in the vertical direction. The connecting rod is in contact with the micrometer, and the coaxiality of the oil cylinder pipe and the rear housing bearing hole can be obtained by the change of the micrometer reading. Through the above structure, the coaxiality can be measured conveniently and quickly, the operation is simple, and it is convenient to quickly and accurately measure the coaxiality of the pipe and the bearing mounting hole in production.

[0041] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A coaxiality measuring fixture for oil cylinder pipes. It is characterized in that include: A length measuring device, a positioning body which is cylindrical in shape as a whole, a measuring hole is provided in the middle of the positioning body, the measuring hole is coaxial with the positioning body, the positioning body also includes a transverse hole formed therein and arranged in the horizontal direction, the transverse hole is connected with the measuring hole, a pressure head and a first compression spring are provided in the transverse hole, one end of the first compression spring abuts against the hole wall of the transverse hole, the other end of the first compression spring abuts against one end of the pressure head, and the other end of the pressure head partially extends into the measuring hole, the positioning body also includes a longitudinal hole formed therein, the longitudinal hole is formed by an end of the transverse hole away from the measuring hole extending vertically upward, a connecting rod is provided in the longitudinal hole, the surface of the connecting rod contacting the positioning body is an arc surface, the lower end of the connecting rod abuts against the pressure head, and the part of the pressure head contacting the connecting rod is a 45° cone surface, the length measuring device includes a measuring rod, the length measuring device is arranged above the longitudinal hole and the lower part of the measuring rod abuts against the upper part of the connecting rod, and the length measuring device is a digital micrometer.

2. The oil cylinder pipe coaxiality measuring fixture according to claim 1, It is characterized in that The oil cylinder pipe coaxiality measuring fixture also includes a support and a table seat, the support includes a seat body and an upper connecting ear and a lower connecting ear respectively arranged at the upper and lower ends of the seat body, the seat body is provided with a measuring rod accommodating cavity passing through it, the length measuring device is fixed to the upper connecting ear by a first threaded connecting piece, the table measuring rod extends into the measuring rod accommodating cavity, and the lower connecting ear is fixed to the positioning body by a second threaded connecting piece.

3. The oil cylinder pipe coaxiality measuring fixture according to claim 2, It is characterized in that The connecting rod includes a first shaft and a second shaft connected to each other, the diameter of the second shaft is larger than that of the first shaft, and a limiting step is formed at the connection between the first shaft and the second shaft. The cylinder pipe coaxiality measuring fixture also includes a second compression spring, one end of the second compression spring abuts against the limiting step, and the other end of the second compression spring abuts against the lower part of the lower connecting ear, and the first shaft passes through the second compression spring.

4. The oil cylinder pipe coaxiality measuring fixture according to claim 1, It is characterized in that The oil cylinder pipe coaxiality measuring jig also includes a handle fixed on the top of the positioning body through a third threaded connector; the handle is arranged opposite to the length measuring device.

5. The oil cylinder pipe coaxiality measuring fixture according to claim 1, It is characterized in that A limit groove formed by a groove is arranged above the pressure head, and the oil cylinder pipe coaxiality measuring fixture also includes a limit pin, one end of the limit pin is fixed to the positioning body, and the other end of the limit pin extends into the limit groove.

6. The oil cylinder pipe coaxiality measuring fixture according to claim 1, It is characterized in that The bottom of the positioning body is in an annular shape as a whole, and the outer side surface of the bottom of the positioning body is a conical surface that is larger at the top and smaller at the bottom.

7. The oil cylinder pipe coaxiality measuring fixture according to claim 1, It is characterized in that When forming the transverse hole, first drill into the side of the positioning body to form a basic hole, and then block the end of the basic hole away from the measuring hole with a plug to form the transverse hole.

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