External thread tip diameter measuring device and measuring method

Abstract

The application discloses a male thread top diameter measuring device and a measuring method, and belongs to the technical field of measuring devices.The male thread top diameter measuring device comprises a base, a micrometer, a support, a connecting rod, a wedge-shaped block and two pressure sensors, the base is horizontally arranged, the micrometer is vertically arranged at the middle of the upper end of the base, the support is arranged above the base, the support is provided with a vertically arranged connecting rod, the middle of the lower end of the wedge-shaped block is provided with an angular notch which penetrates the wedge-shaped block from front to back, a vertically penetrating first sliding hole is arranged at the top corner of the angular notch on the wedge-shaped block, the first sliding hole is located on the angle bisector of the top corner of the angular notch, the top corner of the angular notch is alpha, the connecting rod penetrates the first sliding hole, and the lower end of the connecting rod is provided with a first limiting block, the measuring part of the micrometer and the connecting rod are located in the same vertical plane in the front-rear direction, and the two pressure sensors are arranged on the side walls on the two sides of the angular notch respectively, and the device has the advantages of simple structure and convenient measurement.

Description

Technical Field

[0001] This invention belongs to the field of external thread top diameter measurement technology, and particularly relates to an external thread top diameter measuring device and measurement method. Background Technology

[0002] In the petroleum industry, especially in the manufacturing and application of oil pipes, the precise dimensions and parameters of external threads are crucial. Threaded connections play a key role in oil pipeline systems, and their quality and performance directly affect the efficiency and safety of oil extraction, transportation, and processing. To ensure the reliability and tightness of threaded connections, the petroleum industry imposes stringent requirements on the measurement and inspection of external threads. However, due to the large size and complex shape of oil pipes, traditional measurement methods have limitations in certain situations. Traditional external thread measurement methods usually rely on manual operation, requiring operators to hold measuring instruments. However, in oil pipe production sites, due to the large size of the pipes and the fact that they often need to be rotated, it is difficult for operators to ensure that the measuring instrument remains in the correct measuring position, affecting the accuracy and stability of the measurement. In addition, operators need to have extensive experience to ensure that the center position of the pipe is accurately located during rotation, further increasing the difficulty of measurement. Traditional methods may also lead to long measurement times, limiting production efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a simple, convenient, and highly accurate external thread top diameter measuring device.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: An external thread top diameter measuring device includes a base, a dial indicator, a bracket, a connecting rod, a wedge block, and two pressure sensors. The base is horizontally arranged, the dial indicator is vertically arranged in the middle of the upper end of the base, the bracket is arranged above the base, and the bracket has a vertically arranged connecting rod. The middle of the lower end of the wedge block has a through-angle notch, and a vertically through-angle first sliding hole is provided on the wedge block corresponding to the apex of the notch. The first sliding hole is located on the angle bisector of the apex of the notch, and the apex angle of the notch is α. The connecting rod passes through the first sliding hole, and a first limiting block is provided at the lower end of the connecting rod. The measuring part of the dial indicator and the connecting rod are in the same vertical plane corresponding to each other in the front-back direction. The two pressure sensors are respectively arranged on the two side walls of the notch.

[0005] The beneficial effects of the above technical solution are as follows: In this solution, a wedge block is set upside down on the part to be tested, and the lower end of the first limiting block is abutted against the upper end of the part to be tested. In this way, the L value can be calculated by formula, and the top diameter of the external thread of the part to be tested can be obtained by subtracting the L value and the C value between the measuring end of the dial indicator and the base from the vertical distance between the top corner and the base.

[0006] The apex angle of the angular notch described in the above technical solution is an obtuse angle.

[0007] The advantages of the above technical solution are that it has a simple structure and good stability when fastened to the upper end of the test piece.

[0008] In the above technical solution, α is 120°.

[0009] The advantages of the above technical solution are that it has a simple structure and is easy to convert.

[0010] The pressure sensor described in the above technical solution is a diaphragm pressure sensor.

[0011] The beneficial effect of the above technical solution is that it enables the sensing of the force points on the entire side of the triangular notch.

[0012] The bracket described in the above technical solution includes a column and a crossbeam. The column is vertically mounted on the base, and the crossbeam is horizontally mounted in the left-right direction, with one end connected to the upper end of the column. The connecting rod is connected to the crossbeam.

[0013] The advantages of the above technical solution are that it has a simple structure and makes it easier to install the connecting rod on the crossbeam.

[0014] In the above technical solution, a second sliding hole is provided at the corresponding position of the crossbeam, and the connecting rod passes through the second sliding hole. A second limiting block is provided at the upper end of the connecting rod, and the connecting rod can slide up and down relative to the crossbeam.

[0015] The beneficial effect of the above technical solution is that the connecting rod can slide up and down, so that the entire external thread top diameter measuring device can adapt to the measurement needs of test pieces of different diameters.

[0016] The above technical solution also includes a spring, which is sleeved on the connecting rod and located between the first limiting block and the crossbeam.

[0017] The beneficial effect of the above technical solution is that the spring can apply a downward force to the wedge block, so that the wedge block and the test piece fit better.

[0018] In the above technical solution, the first sliding hole and the second sliding hole have the same shape and size, and both are non-circular holes, and the cross-section of the connecting rod matches the first sliding hole.

[0019] The beneficial effect of the above technical solution is that the connecting rod will not rotate when sliding up and down, and the wedge block will not rotate relative to the connecting rod.

[0020] In the above technical solution, both the first and second sliding holes are square holes, and the cross-section of the connecting rod is square.

[0021] The beneficial effect of the above technical solution is that its structure is simple.

[0022] The second objective of this invention is to provide a method for measuring the external thread diameter of a workpiece using the aforementioned external thread diameter measuring device.

[0023] To achieve the above objectives, another technical solution of the present invention is as follows: a method for measuring the top diameter of an external thread, using the external thread top diameter measuring device as described above, wherein the measurement steps are as follows:

[0024] The test piece is horizontally positioned between the dial indicator and the wedge block along the front-to-back direction, with the lower end of the connecting rod abutting against the upper end of the test piece. When the two pressure sensors generate sensing force, the measuring end of the dial indicator abuts against the lower end of the test piece, the sidewalls on both sides of the angular notch are in contact with the outer wall of the test piece, and the measuring ends of the connecting rod and the dial indicator are both radially distributed along the test piece.

[0025] Wherein, the vertical distance from the lower end of the first limiting block to the apex of the angular notch is L, L=R[sin(180°-α)-1], and R is the nominal radius of the part to be measured;

[0026] The formula for measuring the external thread critical diameter of the workpiece is: D = ABL - C + t;

[0027] A is the distance between the base and the crossbeam;

[0028] B is the distance between the apex of the angular notch and the crossbeam;

[0029] C is the distance between the measuring end of the dial indicator and the upper end of the base;

[0030] t represents the deviation value measured by the dial indicator.

[0031] The advantages of the above technical solution are: it has high measurement accuracy. Since A is a fixed value, B can be easily measured, and L and C can also be accurately obtained. Therefore, the external thread top diameter of the workpiece can be measured flexibly and quickly. Attached Figure Description

[0032] Figure 1 This is a simplified structural diagram of the external thread top diameter measuring device and the workpiece to be measured according to Embodiment 1 of the present invention after assembly;

[0033] Figure 2 This is a simplified structural diagram of the external thread top diameter measuring device described in Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the wedge-shaped block described in Embodiment 1 of the present invention;

[0035] Figure 4 This is a top view of the wedge-shaped block described in Embodiment 1 of the present invention;

[0036] Figure 5 This is a schematic diagram illustrating the principle of the external thread top diameter measurement method described in Embodiment 2 of the present invention.

[0037] In the diagram: 1. Base, 2. Dial indicator, 3. Bracket, 31. Column, 32. Crossbeam, 321. Second sliding hole, 4. Connecting rod, 41. First limiting block, 42. Second limiting block, 5. Wedge block, 51. Angular notch, 52. First sliding hole, 6. Pressure sensor, 7. Spring, 8. Component to be tested. Detailed Implementation

[0038] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0039] Example 1

[0040] like Figures 1-3As shown, this embodiment provides a device for measuring the top diameter of an external thread, including a base 1, a dial indicator 2, a bracket 3, a connecting rod 4, a wedge block 5, and two pressure sensors 6. The base 1 is horizontally positioned, the dial indicator 2 is vertically positioned at the upper center of the base 1, the bracket 3 is positioned above the base 1, and the bracket 3 has a vertically positioned connecting rod 4. The wedge block 5 has a through-angle notch 51 at the lower center, and a vertically penetrating first sliding hole 52 is provided on the wedge block 5 corresponding to the apex of the notch 51, and the first sliding hole 52 is located on the angle bisector of the apex of the notch 51. The apex angle of the angled notch 51 is α. The connecting rod 4 passes through the first sliding hole 52, and the lower end of the connecting rod 4 is provided with a first limiting block 41. The measuring part of the dial indicator 2 and the connecting rod 4 are in the same vertical plane corresponding to each other in the front-back direction. The two pressure sensors 6 are respectively set on the two side walls of the angled notch 51. In this solution, a wedge block is set to be upside down on the workpiece to be tested, and the lower end of the first limiting block is abutted against the upper end of the workpiece to be tested. In this way, the L value can be calculated by formula, and the top diameter of the external thread of the workpiece to be tested can be obtained by subtracting the L value and the C value between the measuring end of the dial indicator and the base from the vertical distance between the apex angle and the base.

[0041] In the above technical solution, the apex angle of the angular notch 51 is an obtuse angle, which has a simple structure and good stability when fastened to the upper end of the test piece. Preferably, α is 120°, which has a simple structure and is easy to convert.

[0042] The pressure sensor 6 described in the above technical solution is a diaphragm pressure sensor, which enables it to sense the force points on the entire side of the angular notch.

[0043] The bracket 3 described in the above technical solution includes a column 31 and a crossbeam 32. The column 31 is vertically arranged on the base 1, and the crossbeam 32 is horizontally arranged in the left-right direction, with one end connected to the upper end of the column 31. The connecting rod 4 is connected to the crossbeam 32. The structure is simple and makes it easier to install the connecting rod on the crossbeam.

[0044] In the above technical solution, a second sliding hole 321 is provided at the corresponding position of the crossbeam 32, and the connecting rod 4 passes through the second sliding hole 321. A second limiting block 42 is provided at the upper end of the connecting rod 4. The connecting rod 4 can slide up and down relative to the crossbeam 32, so that the connecting rod can slide up and down, so that the entire external thread top diameter measuring device can adapt to the measurement needs of different diameter test pieces.

[0045] The above technical solution also includes a spring 7, which is sleeved on the connecting rod 4 and located between the first limiting block 41 and the crossbeam 32. In this way, the spring can apply a downward force to the wedge block, so that the wedge block fits the test piece better.

[0046] like Figure 4 As shown, in the above technical solution, the first sliding hole 52 and the second sliding hole 321 have the same shape and size, and are both non-circular holes. The cross-section of the connecting rod 4 matches the first sliding hole 52, so that the connecting rod will not rotate when sliding up and down, and the wedge block will not rotate relative to the connecting rod. Preferably, the first sliding hole 52 and the second sliding hole 321 are both square holes, and the cross-section of the connecting rod 4 is square, which has a simple structure.

[0047] The lower end face of the pressure sensor is flush with the side wall of the angular notch.

[0048] Preferably, the sensing end of the dial indicator is aligned vertically with the connecting rod, and the first limiting block can be a spherical block. The connecting rod and the spherical block are radially distributed. In this embodiment, the wedge block is symmetrical about the apex of the angular notch. The pressure sensor is used to sense whether the wedge block is in contact with the workpiece. When both pressure sensors generate a sensing signal, it indicates that the wedge block is properly pressed onto the workpiece. The upper surface of the wedge block is a flat surface (a horizontal flat surface), which can be regarded as an angular notch opened in the middle of the lower end of a cube.

[0049] Example 2

[0050] like Figure 5 As shown, this embodiment provides a method for measuring the top diameter of an external thread. The method uses the external thread top diameter measuring device described in Embodiment 1. The measurement steps are as follows: The workpiece 8 to be measured is horizontally positioned between the dial indicator 2 and the wedge block 5 along the front-back direction. The lower end of the connecting rod 4 abuts against the upper end of the workpiece 8. When the two pressure sensors 6 generate sensing force, the measuring end of the dial indicator 2 abuts against the lower end of the workpiece 8. The sidewalls of the angled notch 51 are in contact with the outer wall of the workpiece 8. The measuring ends of the connecting rod 4 and the dial indicator 2 are both radially distributed along the workpiece 8. The vertical distance from the lower end of the first limiting block 41 to the apex of the angled notch 51 is L, where L = R[sin(180°-α)-1], and R is the nominal radius of the workpiece 8. The formula for measuring the top diameter of the external thread of the workpiece 8 is: D = ABL - C + t.

[0051] A is the distance between base 1 and crossbeam 32;

[0052] B is the distance between the apex of the angular notch 51 and the crossbeam 32;

[0053] C is the distance between the measuring end of the dial indicator 2 and the upper end of the base 1;

[0054] t is the deviation value measured by dial indicator 2 (which can be positive or negative). It has high measurement accuracy. Since A is a fixed value, B can be easily measured, and L and C can also be accurately obtained. Therefore, the external thread top diameter of the workpiece can be measured flexibly and quickly.

[0055] In this embodiment, the test piece can be an oil and gas pipeline. When measuring, the test piece is horizontally supported in the front-to-back direction by a bracket, and it is ensured that the line connecting the connecting rod and the measuring end of the dial indicator passes through the axis of the test piece and intersects it perpendicularly.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for measuring the top diameter of an external thread, characterized in that, The device includes a base (1), a dial indicator (2), a bracket (3), a connecting rod (4), a wedge block (5), and two pressure sensors (6). The base (1) is horizontally positioned, the dial indicator (2) is vertically positioned at the middle of the upper end of the base (1), the bracket (3) is positioned above the base (1), and the bracket (3) has a vertically positioned connecting rod (4). The wedge block (5) has a through-angle notch (51) at the middle of its lower end, and the wedge block (5) has a corresponding angle notch (51) at the apex of the angle notch (51). A first sliding hole (52) is provided vertically through it, and the first sliding hole (52) is located on the angle bisector of the apex of the angled notch (51). The apex of the angled notch (51) is α. The connecting rod (4) passes through the first sliding hole (52), and a first limiting block (41) is provided at the lower end of the connecting rod (4). The measuring part of the dial indicator (2) and the connecting rod (4) are in the same vertical plane corresponding to each other in the front and back directions. Two pressure sensors (6) are respectively provided on the two side walls of the angled notch (51).

2. The external thread top diameter measuring device according to claim 1, characterized in that, The apex angle of the angular notch (51) is an obtuse angle.

3. The external thread top diameter measuring device according to claim 1, characterized in that, α is 120°.

4. The external thread top diameter measuring device according to claim 1, characterized in that, The pressure sensor (6) is a diaphragm pressure sensor.

5. The external thread top diameter measuring device according to claim 1, characterized in that, The bracket (3) includes a column (31) and a crossbeam (32). The column (31) is vertically arranged on the base (1), and the crossbeam (32) is horizontally arranged in the left-right direction, with one end connected to the upper end of the column (31). The connecting rod (4) is connected to the crossbeam (32).

6. The external thread top diameter measuring device according to claim 5, characterized in that, The crossbeam (32) is provided with a second sliding hole (321) at the corresponding position, and the connecting rod (4) passes through the second sliding hole (321). The upper end of the connecting rod (4) is provided with a second limiting block (42), and the connecting rod (4) can slide up and down relative to the crossbeam (32).

7. The external thread top diameter measuring device according to claim 6, characterized in that, It also includes a spring (7), which is sleeved on the connecting rod (4) and located between the first limiting block (41) and the crossbeam (32).

8. The external thread top diameter measuring device according to claim 6, characterized in that, The first sliding hole (52) and the second sliding hole (321) have the same shape and size, and are both non-circular holes. The cross-section of the connecting rod (4) matches the first sliding hole (52).

9. The external thread top diameter measuring device according to claim 8, characterized in that, The first sliding hole (52) and the second sliding hole (321) are both square holes, and the cross-section of the connecting rod (4) is square.

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