Flange dimension measuring device

Abstract

The utility model discloses a flange dimension measuring device, which belongs to the technical field of flange dimension measurement, and is characterized by comprising a measuring table, angle measuring scales are embedded in the periphery of the top of the measuring table, a flange body is arranged at the top of the measuring table, and a limiting through groove is formed in the top of the measuring table. A clamping and fixing assembly used in cooperation with the flange body is arranged in an inner cavity of the limiting through groove, a center block is fixedly connected to the inner wall of the limiting through groove, a center hole is formed in the top of the center block, and a supporting frame is fixedly connected to the top of the measuring table; the problems that an existing measuring device can only measure the inner diameter, the outer diameter and the thickness of a flange generally, the angle spacing of flange bolt holes is inconvenient to measure generally, the setting position of the flange bolt holes is very important, when the angle spacing of the flange bolt holes deviates, the holes of two connecting flanges cannot be aligned, and the measuring accuracy is poor are solved. Therefore, the problem that two flanges cannot be connected and fixed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flange size measurement, and particularly relates to a flange size measurement device. Background Art

[0002] A flange, also known as a flange convex disc or flange, is a part used for connecting shafts to each other and is used for connecting between pipe ends; there are also flanges used at the inlets and outlets of equipment for connecting between two pieces of equipment, such as a reducer flange. A flange connection or flange joint refers to a detachable connection composed of a flange, a gasket, and bolts connected to each other as a set of combined sealing structures. A pipe flange refers to a flange used for piping in a pipeline device, and when used on equipment, it refers to the inlet and outlet flanges of the equipment. There are holes on the flange, and bolts tightly connect the two flanges.

[0003] Currently, for the Chinese patent with the publication number CN214747691U, this utility model discloses a size measurement device for flange processing, which relates to the technical field of flange processing. This utility model includes a base, one end of the upper surface of the base is fixedly connected with a panel, a U-shaped fixing rod is fixedly connected to the side surface of the panel, a measuring plate is slidably connected to the surface of the U-shaped fixing rod, and a first compression spring is fixedly connected between the opposite surfaces of the measuring plate and the U-shaped fixing rod. By setting the measuring plate and the panel, under the rebound of the first compression spring, the panel and the measuring plate clamp the flange, and the distance between the panel and the measuring plate at this time is the outer diameter size of the flange. At the same time, by using the movable push rod arranged on the center line of the base and using the roller to buckle inside the center circle of the flange; by setting a pressing plate and an indicating head, the second compression spring compresses the pressing plate to make the pressing plate tightly press the flatly placed flange, and the distance that the indicating head moves is the thickness of the flange, so that the inner and outer diameters and thickness of the flange can be quickly measured to ensure whether the detected flange is qualified.

[0004] After the production and processing of flanges, it is necessary to measure the inner diameter, outer diameter, thickness, and angular pitch of the bolt holes of the flanges, so a measuring device will be used. Existing measuring devices usually can only measure the inner diameter, outer diameter, and thickness of the flanges, and usually it is not convenient to measure the angular pitch of the bolt holes of the flanges. The set positions of the bolt holes of the flanges are very important. When the angular pitch of the bolt holes of the flanges deviates, the holes of the two connected flanges cannot be aligned, resulting in the inability to connect and fix the two flanges. Content of the Utility Model

[0005] The utility model provides a flange size measurement device, aiming to solve the problem that existing measuring devices usually can only measure the inner diameter, outer diameter, and thickness of flanges, and usually it is not convenient to measure the angular pitch of the bolt holes of flanges. The set positions of the bolt holes of flanges are very important. When the angular pitch of the bolt holes of flanges deviates, the holes of the two connected flanges cannot be aligned, resulting in the inability to connect and fix the two flanges.

[0006] The present utility model is realized as follows. A flange size measuring device includes a measuring table. Angle measuring rulers are embedded around the top of the measuring table. A flange body is arranged on the top of the measuring table. A limiting through groove is opened on the top of the measuring table. A clamping and fixing component for cooperating with the flange body is arranged in the inner cavity of the limiting through groove. A central block is fixedly connected to the inner wall of the limiting through groove. A central hole is opened on the top of the central block. A support frame is fixedly connected to the top of the measuring table. A positioning rod is arranged on the top of the measuring table. The bottom of the positioning rod is inserted into the inner cavity of the central hole. The top of the positioning rod penetrates through the support frame. A slide bar is fixedly connected to the left side of the positioning rod. A slide sleeve is sleeved on the surface of the slide bar. A positioning block is fixedly connected to the front side of the slide sleeve. A slide rod is slidably connected to the inner cavity of the positioning block. A tapered block is fixedly connected to the bottom of the slide rod. A limiting plate is fixedly connected to the left side of the slide bar. A fixing plate is fixedly connected to the front side of the limiting plate. An angle pointer is fixedly connected to the bottom of the fixing plate.

[0007] The clamping and fixing component includes a crank, a bidirectional screw rod, a first moving block, a second moving block, a first arc-shaped clamping block and a second arc-shaped clamping block. The left side of the bidirectional screw rod is fixedly connected to the top of the right side of the crank. The right side of the bidirectional screw rod sequentially penetrates through the measuring table and the central block and extends to the right side of the measuring table. The inner walls of the first moving block and the second moving block are respectively threadedly connected to the left side and the right side of the surface of the bidirectional screw rod. The bottom of the first arc-shaped block is fixedly connected to the top of the first moving block. The bottom of the second arc-shaped clamping block is fixedly connected to the top of the second moving block.

[0008] In order to achieve the effect of supporting the measuring table, as a preferred embodiment of the flange size measuring device of the present utility model, support legs are fixedly connected to the front side and the rear side of both sides of the bottom of the measuring table.

[0009] In order to achieve the effect that there is no deviation in the measurement of the angular pitch of the bolt holes of the flange body, as a preferred embodiment of the flange size measuring device of the present utility model, the angle measuring ruler, the flange body, the central hole and the positioning rod are at the same center point, and the bottom of the surface of the positioning rod contacts the inner wall of the central hole.

[0010] In order to achieve the effect that the positioning rod can move up and down, as a preferred embodiment of the flange size measuring device of the present utility model, a first sliding hole for cooperating with the positioning rod is opened on the top of the inner wall of the support frame. The surface of the positioning rod is slidably connected to the inner wall of the first sliding hole. A first pulling ring is fixedly connected to the top of the positioning rod.

[0011] In order to achieve the effect that the sliding rod can move up and down, as an optimization of a flange size measuring device of the present utility model, a second sliding hole for cooperating with the sliding rod is formed at the top of the positioning block, the surface of the sliding rod is slidably connected to the inner wall of the second sliding hole, and a second pulling ring is fixedly connected to the top of the sliding rod.

[0012] In order to achieve the effect that the bidirectional screw can pass through the measuring table and the central block and is conveniently rotated through bearing connection, as an optimization of a flange size measuring device of the present utility model, movable holes for cooperating with the bidirectional screw are formed on both sides of the measuring table and on the left side of the central block, and one side of the surface of the bidirectional screw close to the inner wall of the movable hole is rotatably connected to the inner wall of the movable hole through a bearing.

[0013] In order to achieve the effect that the first moving block and the second moving block do not shake during movement, as an optimization of a flange size measuring device of the present utility model, the sides of the first moving block and the second moving block close to the inner wall of the limiting through groove are slidably connected to the inner wall of the limiting through groove.

[0014] In order to protect the flange body and prevent the first arc-shaped clamping block and the second arc-shaped clamping block from scratching the flange body, as an optimization of a flange size measuring device of the present utility model, rubber pads are fixedly connected to the right side of the first arc-shaped clamping block and the left side of the second arc-shaped clamping block, and the side of the rubber pad close to the flange body is in close contact with the flange body.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The flange size measuring device, by setting a measuring table, an angle measuring ruler, a flange body, a limiting through groove, a clamping and fixing assembly, a center block, a center hole, a support frame, a positioning rod, a sliding strip, a sliding sleeve, a positioning block, a sliding rod, a tapered block, a limiting plate, a fixing plate and an angle pointer. When in use, place the flange body at the center position on the top of the measuring table, and then adjust the clamping and fixing assembly. The clamping and fixing assembly clamps and fixes the flange body. By fixing the flange body, the flange body will not move, which can increase the measuring accuracy of the flange body. Moreover, the clamping method of the clamping and fixing assembly moving from both sides to the middle simultaneously for the flange body can position the flange body at the center position on the top of the measuring table, facilitating the subsequent measurement of the angular spacing of the bolt holes of the flange body. Then move the positioning rod downward and insert it into the center hole. Then pull the sliding sleeve to make the sliding sleeve move on the surface of the sliding strip. The sliding sleeve drives the positioning block to move, the positioning block drives the sliding rod to move, and the sliding rod drives the tapered block to move to a suitable distance. Then move the sliding rod downward, and the sliding rod drives the tapered block to move downward and insert the tapered block into any bolt hole of the flange body. Then observe the position of the angle measuring ruler pointed by the angle pointer. Then withdraw the tapered block from the bolt hole of the flange body through the sliding rod. Then push the sliding strip to make the sliding strip move in an arc by rotating through the positioning rod. The sliding strip drives the tapered block to move in an arc through the sliding sleeve, the positioning block and the sliding rod. Move the tapered block to a suitable position and insert it into the next bolt hole of the flange body. Then observe the distance between the current position pointed by the angle pointer and the previous position pointed, and the angular spacing between the two bolt holes of the flange body can be obtained by observing the angle measuring ruler. Then measure the angular spacing of the bolt holes of other flange bodies in the above way, thus achieving the effect of facilitating the measurement of the angular spacing between any two bolt holes of the flange body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structure diagram of the flange size measuring device of the present utility model;

[0018] Figure 2 is the structure diagram of the measuring table, the clamping and fixing assembly and the center block in the present utility model;

[0019] Figure 3 is the split structure diagram of the support and the positioning rod and the positioning block and the sliding rod in the present utility model;

[0020] Figure 4 is the split structure diagram of the clamping and fixing assembly and the center block in the present utility model;

[0021] Figure 5 is the structure diagram of the measuring table, the angle measuring ruler and the center block in the present utility model.

[0022] In the figure, 1 is a measuring table; 2 is an angle measuring ruler; 3 is a flange body; 4 is a limiting through groove; 5 is a clamping and fixing assembly; 501 is a crank; 502 is a bidirectional screw; 503 is a first moving block; 504 is a second moving block; 505 is a first arc-shaped clamping block; 506 is a second arc-shaped clamping block; 6 is a center block; 7 is a center hole; 8 is a support frame; 9 is a positioning rod; 10 is a slide bar; 11 is a sliding sleeve; 12 is a positioning block; 13 is a slide rod; 14 is a tapered block; 15 is a limiting plate; 16 is a fixing plate; 17 is an angle pointer; 18 is a support leg; 19 is a first sliding hole; 20 is a first pull ring; 21 is a second sliding hole; 22 is a second pull ring; 23 is a movable hole; 24 is a rubber pad. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0025] Please refer to Figures 1-5, the present utility model provides a technical solution: a flange size measuring device, which includes a measuring table 1. Angle measuring rulers 2 are embedded around the top of the measuring table 1. A flange body 3 is arranged on the top of the measuring table 1. A limiting through groove 4 is opened on the top of the measuring table 1. A clamping and fixing assembly 5 for cooperating with the flange body 3 is arranged in the inner cavity of the limiting through groove 4. A central block 6 is fixedly connected to the inner wall of the limiting through groove 4. A central hole 7 is opened on the top of the central block 6. A support frame 8 is fixedly connected to the top of the measuring table 1. A positioning rod 9 is arranged on the top of the measuring table 1. The bottom of the positioning rod 9 is inserted into the inner cavity of the central hole 7. The top of the positioning rod 9 penetrates through the support frame 8. A slide bar 10 is fixedly connected to the left side of the positioning rod 9. A slide sleeve 11 is sleeved on the surface of the slide bar 10. A positioning block 12 is fixedly connected to the front side of the slide sleeve 11. A slide rod 13 is slidably connected to the inner cavity of the positioning block 12. A tapered block 14 is fixedly connected to the bottom of the slide rod 13. A limiting plate 15 is fixedly connected to the left side of the slide bar 10. A fixing plate 16 is fixedly connected to the front side of the limiting plate 15. An angle pointer 17 is fixedly connected to the bottom of the fixing plate 16;

[0026] The clamping and fixing assembly 5 includes a crank 501, a bidirectional screw 502, a first moving block 503, a second moving block 504, a first arc-shaped clamping block 505 and a second arc-shaped clamping block 506. The left side of the bidirectional screw 502 is fixedly connected to the top of the right side of the crank 501. The right side of the bidirectional screw 502 sequentially penetrates through the measuring table 1 and the central block 6 and extends to the right side of the measuring table 1. The inner walls of the first moving block 503 and the second moving block 504 are respectively threadedly connected to the left side and the right side of the surface of the bidirectional screw 502. The bottom of the first arc-shaped block is fixedly connected to the top of the first moving block 503. The bottom of the second arc-shaped clamping block 506 is fixedly connected to the top of the second moving block 504.

[0027] In this embodiment: By providing a measuring table 1, an angle measuring scale 2, a flange body 3, a limiting through groove 4, a clamping and fixing assembly 5, a central block 6, a central hole 7, a support frame 8, a positioning rod 9, a sliding bar 10, a sliding sleeve 11, a positioning block 12, a sliding rod 13, a tapered block 14, a limiting plate 15, a fixing plate 16 and an angle pointer 17, during use, place the flange body 3 at the center position on the top of the measuring table 1, and then adjust the clamping and fixing assembly 5. Clamp and fix the flange body 3 through the clamping and fixing assembly 5. By fixing the flange body 3, the flange body 3 will not move, which can increase the measurement accuracy of the flange body 3. Moreover, the clamping method of the clamping and fixing assembly 5 moving from both sides towards the middle simultaneously can position the flange body 3 at the center position on the top of the measuring table 1, facilitating the subsequent measurement of the angular spacing of the bolt holes of the flange body 3. Then, move the positioning rod 9 downward and insert it into the central hole 7. Then, pull the sliding sleeve 11 to make the sliding sleeve 11 move on the surface of the sliding bar 10. The sliding sleeve 11 drives the positioning block 12 to move, the positioning block 12 drives the sliding rod 13 to move, and the sliding rod 13 drives the tapered block 14 to move to an appropriate distance. Then, move the sliding rod 13 downward. The sliding rod 13 drives the tapered block 14 to move downward and makes the tapered block 14 insert into any one of the bolt holes of the flange body 3. Then, observe the position of the angle measuring scale 2 pointed by the angle pointer 17. Then, withdraw the tapered block 14 from the bolt hole of the flange body 3 through the sliding rod 13. Then, push the sliding bar 10 to make the sliding bar 10 rotate and move in an arc through the positioning rod 9. The sliding bar 10 drives the tapered block 14 to move in an arc through the sliding sleeve 11, the positioning block 12 and the sliding rod 13. Move the tapered block 14 to an appropriate position and insert it into the next bolt hole of the flange body 3. Then, observe the distance between the current position pointed by the angle pointer 17 and the previous position pointed by it, and the angular spacing between the two bolt holes of the flange body 3 can be obtained by observing the angle measuring scale 2. Then, measure the angular spacing of the bolt holes of other flange bodies 3 in the above manner, thus achieving the effect of facilitating the measurement of the angular spacing between any two bolt holes of the flange body 3.

[0028] As a technical optimization solution of the present utility model, the front side and the rear side of both sides at the bottom of the measuring table 1 are fixedly connected with support legs 18.

[0029] In this embodiment: By providing the support legs 18, the measuring table 1 can be supported.

[0030] As a technical optimization solution of the present utility model, the angle measuring scale 2, the flange body 3, the central hole 7 and the positioning rod 9 are at the same center point, and the bottom surface of the positioning rod 9 contacts the inner wall of the central hole 7.

[0031] In this embodiment: By setting the angle measuring ruler 2, flange body 3, central hole 7, and positioning rod 9 to have the same center point, in order to ensure that there is no deviation in the measurement of the angular spacing of the bolt holes in the flange body 3, the bottom surface of the positioning rod 9 is in contact with the inner wall of the central hole 7, so that the positioning rod 9 can rotate conveniently.

[0032] As a technical optimization solution of the present utility model, a first sliding hole 19 for cooperating with the positioning rod 9 is provided at the top of the inner wall of the support frame 8. The surface of the positioning rod 9 is slidably connected to the inner wall of the first sliding hole 19, and a first pulling ring 20 is fixedly connected to the top of the positioning rod 9.

[0033] In this embodiment: By providing the first sliding hole 19, the positioning rod 9 can move up and down. By providing the first pulling ring 20, it is convenient to push and pull the positioning rod 9 up and down.

[0034] As a technical optimization solution of the present utility model, a second sliding hole 21 for cooperating with the sliding rod 13 is provided at the top of the positioning block 12. The surface of the sliding rod 13 is slidably connected to the inner wall of the second sliding hole 21, and a second pulling ring 22 is fixedly connected to the top of the sliding rod 13.

[0035] In this embodiment: By providing the second sliding hole 21, the sliding rod 13 can move up and down. By providing the second pulling ring 22, it is convenient to push and pull the sliding rod 13 up and down.

[0036] As a technical optimization solution of the present utility model, movable holes 23 for cooperating with the bidirectional screw rod 502 are provided on both sides of the measuring table 1 and on the left side of the central block 6. One side of the surface of the bidirectional screw rod 502 close to the inner wall of the movable hole 23 is rotatably connected to the inner wall of the movable hole 23 through a bearing.

[0037] In this embodiment: By providing the movable hole 23, the bidirectional screw rod 502 can pass through the measuring table 1 and the central block 6, and the rotation is facilitated through the bearing connection.

[0038] As a technical optimization solution of the present utility model, one side of the first moving block 503 and the second moving block 504 close to the inner wall of the limiting through groove 4 is slidably connected to the inner wall of the limiting through groove 4.

[0039] In this embodiment: By setting one side of the first moving block 503 and the second moving block 504 close to the inner wall of the limiting through groove 4 to be slidably connected to the inner wall of the limiting through groove 4, the first moving block 503 and the second moving block 504 will not shake when moving.

[0040] As a technical optimization solution of the utility model, rubber pads 24 are fixedly connected to the right side of the first arc-shaped clamping block 505 and the left side of the second arc-shaped clamping block 506. The side of the rubber pad 24 close to the flange body 3 is in close contact with the flange body 3.

[0041] In this embodiment: By providing the rubber pads 24, the flange body 3 can be protected to prevent the first arc-shaped clamping block 505 and the second arc-shaped clamping block 506 from scratching the flange body 3.

[0042] Working principle: First, place the flange body 3 at the center position on the top of the measuring table 1, and then adjust the rotating crank 501. The crank 501 drives the bidirectional screw 502 to rotate. By the rotation of the bidirectional screw 502, the first moving block 503 and the second moving block 504 move in opposite directions. The first moving block 503 and the second moving block 504 drive the first arc-shaped clamping block 505 and the second arc-shaped clamping block 506 to move in opposite directions respectively. The flange body 3 is clamped and fixed by the first arc-shaped clamping block 505 and the second arc-shaped clamping block 506. By fixing the flange body 3, the flange body 3 will not move, which can increase the measurement accuracy of the flange body 3. Moreover, the clamping method of the first arc-shaped clamping block 505 and the second arc-shaped clamping block 506 moving from both sides to the middle at the same time can position the flange body 3 at the center position on the top of the measuring table 1, which is convenient for subsequent measurement of the angular pitch of the bolt holes of the flange body 3. Then move the positioning rod 9 downward and insert it into the central hole 7. Then pull the sliding sleeve 11 to make the sliding sleeve 11 move on the surface of the sliding strip 10. The sliding sleeve 11 drives the positioning block 12 to move, the positioning block 12 drives the sliding rod 13 to move, and the sliding rod 13 drives the tapered block 14 to move to an appropriate distance. Then move the sliding rod 13 downward. The sliding rod 13 drives the tapered block 14 to move downward and makes the tapered block 14 insert into any bolt hole of the flange body 3. Then observe the position of the angle pointer 17 on the angle measuring scale 2. Then withdraw the tapered block 14 from the bolt hole of the flange body 3 through the sliding rod 13. Then push the sliding strip 10 to make the sliding strip 10 move in an arc through the rotation of the positioning rod 9. The sliding strip 10 drives the tapered block 14 to move in an arc through the sliding sleeve 11, the positioning block 12 and the sliding rod 13. Move the tapered block 14 to an appropriate position and insert it into the next bolt hole of the flange body 3. Then observe the distance between the position indicated by the angle pointer 17 now and the position indicated before, and the angular pitch of the two bolt holes of the flange body 3 can be obtained by observing the angle measuring scale 2. Then measure the angular pitch of the bolt holes of other flange bodies 3 in the above manner, thus achieving the effect of facilitating the measurement of the angular pitch of any two bolt holes of the flange body 3.

[0043] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flange dimension measuring device, comprising a measuring table (1), characterized in that: An angle measuring ruler (2) is embedded around the top of the measuring platform (1), a flange body (3) is provided on the top of the measuring platform (1), a limit slot (4) is provided on the top of the measuring platform (1), a clamping and fixing component (5) used in conjunction with the flange body (3) is provided in the inner cavity of the limit slot (4), a center block (6) is fixedly connected to the inner wall of the limit slot (4), a center hole (7) is provided on the top of the center block (6), a support frame (8) is fixedly connected to the top of the measuring platform (1), a positioning rod (9) is provided on the top of the measuring platform (1), and the bottom of the positioning rod (9) is inserted into the center hole (7). The top of the positioning rod (9) passes through the support frame (8), the left side of the positioning rod (9) is fixedly connected to a slide bar (10), the surface of the slide bar (10) is sleeved with a slide sleeve (11), the front side of the slide sleeve (11) is fixedly connected to a positioning block (12), the inner cavity of the positioning block (12) is slidably connected to a slide rod (13), the bottom of the slide rod (13) is fixedly connected to a conical block (14), the left side of the slide bar (10) is fixedly connected to a limit plate (15), the front side of the limit plate (15) is fixedly connected to a fixed plate (16), and the bottom of the fixed plate (16) is fixedly connected to an angle pointer (17); The clamping and fixing assembly (5) comprises a crank (501), a bidirectional screw (502), a first moving block (503), a second moving block (504), a first arc-shaped clamping block (505) and a second arc-shaped clamping block (506); the left side of the bidirectional screw (502) is fixedly connected to the top of the right side of the crank (501); the right side of the bidirectional screw (502) passes through the measuring platform (1) and the center block (6) in sequence and extends to the right side of the measuring platform (1); the inner walls of the first moving block (503) and the second moving block (504) are respectively connected to the left and right sides of the surface of the bidirectional screw (502) by threads; the bottom of the first arc-shaped clamping block is fixedly connected to the top of the first moving block (503); and the bottom of the second arc-shaped clamping block (506) is fixedly connected to the top of the second moving block (504).

2. A flange size measuring device according to claim 1, characterized in that: Support legs (18) are fixedly connected to the front and rear sides of the bottom of the measuring platform (1).

3. A flange size measuring device according to claim 1, characterized in that: The angle measuring ruler (2), the flange body (3), the center hole (7) and the positioning rod (9) are at the same center point, and the bottom of the surface of the positioning rod (9) contacts the inner wall of the center hole (7).

4. A flange size measuring device according to claim 1, characterized in that: A first sliding hole (19) for use with the positioning rod (9) is provided at the top of the inner wall of the support frame (8); the surface of the positioning rod (9) is slidably connected to the inner wall of the first sliding hole (19); and a first pull ring (20) is fixedly connected to the top of the positioning rod (9).

5. A flange size measuring device according to claim 1, characterized in that: A second sliding hole (21) for use with the sliding rod (13) is provided at the top of the positioning block (12); the surface of the sliding rod (13) is slidably connected to the inner wall of the second sliding hole (21); and a second pull ring (22) is fixedly connected to the top of the sliding rod (13).

6. A flange size measuring device according to claim 1, characterized in that: Both sides of the measuring platform (1) and the left side of the center block (6) are provided with movable holes (23) for use with the bidirectional screw (502), and the side of the surface of the bidirectional screw (502) close to the inner wall of the movable hole (23) is rotatably connected to the inner wall of the movable hole (23) via a bearing.

7. A flange size measuring device according to claim 1, characterized in that: The first moving block (503) and the second moving block (504) are respectively slidably connected to the inner wall of the limiting through slot (4) at one side close to the inner wall of the limiting through slot (4).

8. The flange size measuring device according to claim 1, characterized in that: The right side of the first arc-shaped clamping block (505) and the left side of the second arc-shaped clamping block (506) are both fixedly connected with a rubber pad (24), and the side of the rubber pad (24) close to the flange body (3) is in close contact with the flange body (3).

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