A special buckle internal thread sealing surface diameter measuring device and measuring method

Abstract

The invention discloses a device and method for measuring the diameter of the internal thread sealing surface of a special buckle. A fixed guide rail block and a fixed measuring rod fixed on the fixed guide rail block are used as fixed ends with adjustable distances, and a fixed measuring head is provided on one side of the lower end of the fixed measuring rod; then a movable guide rail block shell fixedly connected to one end of a guide rail arm is used as a fixed movable end, a sliding cavity is provided in the movable guide rail block shell, and a movable guide rail block capable of sliding in the sliding cavity is provided in the sliding cavity, and an indicator is fixed on one side of the movable guide rail block shell; the measuring part of the movable measuring head and the measuring part of the fixed measuring head are arranged relatively to each other and in the same horizontal plane, and a pair of inner measuring head structures capable of relative movement are formed by using the measuring head on the movable measuring rod on the movable guide rail block and the fixed measuring head, so as to realize rapid detection of the size of the sealing surface of the special buckle, improve measurement efficiency, reduce measurement difficulty, and effectively ensure production efficiency. The device has a simple structure and accurate measurement results.

Description

Technical Field

[0001] The invention belongs to a special buckle measuring device, and in particular relates to a special buckle internal thread sealing surface diameter measuring device and a measuring method. Background Art

[0002] Most of my country's oil resources are distributed in very complex and harsh geographical environments such as oceans, deserts, mountains, plateaus, and swamps. Under such an environment, my country's oil extraction is becoming more and more difficult, and the service conditions of oil pipes are becoming more and more severe. This puts higher requirements on the connection firmness of oil pipes. Therefore, this special buckle with seal and thread came into being. With the increasing use of special buckles, researchers have found that once the threads of the special buckles currently used on the market are tightened, the sealing surface will be damaged and the sealing effect will be greatly reduced. The special buckles with cylindrical sealing surfaces have better sealing effects. However, because this buckle type cannot effectively guarantee that the size of the processed sealing surface meets the design requirements in mass production, the main test method is currently used to assemble and test its production qualification rate, but the measurement efficiency is low and the measurement difficulty is large, and the production efficiency cannot be effectively ensured. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for measuring the diameter of a special buckle internal thread sealing surface, so as to overcome the shortcomings of the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A special buckle internal thread sealing surface diameter measuring device comprises a guide rail arm and a movable measuring end and a fixed measuring end arranged on the guide rail arm;

[0006] The fixed measuring end includes a fixed guide rail block and a fixed measuring rod fixed on the fixed guide rail block, and a fixed measuring head and a positioning measuring head are arranged on one side of the lower end of the fixed measuring rod;

[0007] The mobile measuring end includes a movable guide rail block shell fixedly connected to one end of the guide rail arm, a sliding cavity is provided in the movable guide rail block shell, and a movable guide rail block capable of sliding in the sliding cavity is provided in the sliding cavity. An indicator is fixed to one side of the movable guide rail block shell, and a measuring rod of the indicator is in contact with one side of the movable guide rail block; a movable measuring rod is fixed on the movable guide rail block, and a movable measuring head is provided at the lower end of the movable measuring rod. A tension spring is provided between the side of the movable guide rail block shell where the indicator is fixed and the movable guide rail block, and the measuring part of the movable measuring head and the measuring part of the fixed measuring head are arranged relatively to each other and in the same horizontal plane.

[0008] Furthermore, an opening connected to the sliding cavity is provided at the upper end of the movable guide rail block shell, and the upper end opening of the movable guide rail block shell is tightened by a pressure cover. The movable guide rail block shell and the pressure cover are both provided with a through-hole slide groove for moving the measuring rod; the pressure cover is fixed to the movable guide rail block shell by screws.

[0009] Furthermore, a movable guide block adjustment plate is fixed at the bottom of the sliding cavity of the movable guide block housing, a linear guide bearing is arranged on the movable guide block adjustment plate, the upper end of the linear guide bearing is a slideway, a linear guide is arranged at the lower end of the movable guide block, the linear guide is located in the slideway of the linear guide bearing, and the movable guide block slides relatively through the cooperation of the linear guide and the linear guide bearing.

[0010] Furthermore, the linear guide is fixed to the lower end of the movable guide block by screws; two parallel linear guide bearings are fixed to the bottom of the sliding cavity of the movable guide block housing, and two parallel linear guides are provided at the bottom of the movable guide block, with a raised structure between the two linear guides, and the raised structure is located between the two linear guide bearings; the linear guide bearings are fixed to the movable guide adjustment plate by positioning screws.

[0011] Furthermore, a first tension spring pin is fixed on the movable guide rail block shell, and a second tension spring pin is fixed on the movable guide rail block. The axes of the first tension spring pin and the second tension spring pin are parallel, and the axis of the first tension spring pin is perpendicular to the moving direction of the movable guide rail block relative to the movable guide rail block shell. The two ends of the tension spring are respectively fixed on the first tension spring pin and the second tension spring pin.

[0012] Furthermore, a movable guide block reference plate is fixed to the bottom of the movable guide block housing, a spring is provided between the movable guide block reference plate and the movable guide block housing, and the movable guide block reference plate and the movable guide block housing are fixedly connected by screws.

[0013] Furthermore, a horizontal through hole is provided on the fixed guide rail block, the guide arm is inserted into the horizontal through hole of the fixed guide rail block, and a locking screw connecting the horizontal through hole on the fixed guide rail block is provided on the fixed guide rail block, which is used to lock the fixed guide rail block and the guide arm; a vertical through hole is provided on the fixed guide rail block, the fixed measuring rod is fixed in the vertical through hole, and an elastic clamping device for locking the fixed measuring rod is provided in the vertical through hole of the fixed guide rail block.

[0014] Furthermore, a vertical through hole is provided on the movable guide rail block, the movable measuring rod is fixed in the vertical through hole of the movable guide rail block, and an elastic clamping device for locking the movable measuring rod is provided in the vertical through hole of the movable guide rail block.

[0015] Furthermore, the elastic clamping device includes a clamping screw, a push rod, a push rod compression spring and a locking screw. The fixed guide rail block and the movable guide rail block are provided with a push rod hole and a clamping screw hole whose axes are perpendicular to the axis of the vertical through hole. The push rod hole and the clamping screw hole are coaxially located on both sides of the vertical through hole. The push rod compression spring is placed in the push rod hole. One end of the push rod contacts the surface of the fixed measuring rod or the movable measuring rod in the vertical through hole, and the other end of the push rod contacts the push rod compression spring. The push rod compression spring is sleeved on the locking screw, the locking screw is arranged in the push rod hole, and the clamping screw is arranged in the clamping screw hole.

[0016] A method for measuring the diameter of a special internal thread sealing surface comprises the following steps:

[0017] Step 1), fix the fixed guide rail block on the guide rail arm, so that the distance between the fixed guide rail block and the movable guide rail block housing is greater than the maximum size of the pipeline sealing surface to be measured and less than the maximum range of the movable measuring rod on the movable guide rail block housing;

[0018] Step 2), then extend the fixed measuring rod and the mobile measuring rod into the calibration block, rotate the mobile measuring rod in an arc with the fixed measuring head as the center until an inflection point appears on the indicator, and adjust the indicator to zero at the inflection point;

[0019] Step 3) Insert the zero-adjusted fixed measuring rod and the movable measuring rod into the pipe to be measured, move the fixed measuring head and the movable measuring head to the measured part, rotate the movable measuring rod in an arc with the fixed measuring head as the center, if an inflection point appears on the indicator, the value obtained at the inflection point is the actual deviation value of the sealing surface of the pipe to be measured.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention discloses a device for measuring the diameter of the internal thread sealing surface of a special buckle, comprising a guide rail arm and a movable measuring end and a fixed measuring end arranged on the guide rail arm; a fixed guide rail block and a fixed measuring rod fixed on the fixed guide rail block are used as fixed ends with adjustable distance, and a fixed measuring head and a positioning measuring head are provided on one side of the lower end of the fixed measuring rod; then a movable guide rail block shell fixedly connected to one end of the guide rail arm is used as the fixed movable end, a sliding cavity is provided in the movable guide rail block shell, a movable guide rail block capable of sliding in the sliding cavity is provided in the sliding cavity, and an indicator is fixed on one side of the movable guide rail block shell; the measuring part of the movable measuring head and the measuring part of the fixed measuring head are arranged relatively to each other and in the same horizontal plane, and a pair of inner measuring head structures capable of relative movement are formed by the measuring head on the movable measuring rod on the movable guide rail block and the fixed measuring head, so as to realize rapid detection of the size of the sealing surface of the special buckle, improve measurement efficiency, reduce measurement difficulty, thereby effectively ensuring production efficiency, and the device has a simple structure and accurate measurement results.

[0022] Furthermore, an opening connected to the sliding cavity is provided at the upper end of the movable guide rail block shell, and the upper end opening of the movable guide rail block shell is tightened by a pressure cover. The movable guide rail block shell and the pressure cover are both provided with a through-hole slide groove for moving the measuring rod; the pressure cover is fixed to the movable guide rail block shell by screws, which is convenient for internal calibration and maintenance of the movable guide rail block shell.

[0023] Furthermore, a movable guide block adjustment plate is fixed at the bottom of the sliding cavity of the movable guide block housing, a linear guide bearing is arranged on the movable guide block adjustment plate, the upper end of the linear guide bearing is a slideway, a linear guide is arranged at the lower end of the movable guide block, the linear guide is located in the slideway of the linear guide bearing, and the movable guide block slides relative to each other through the cooperation of the linear guide and the linear guide bearing, thereby improving the sliding stability.

[0024] The present invention discloses a method for measuring the diameter of a special-threaded internal sealing surface. First, a fixed guide block is fixed on a guide arm so that the distance between the fixed guide block and a movable guide block shell is greater than the maximum size of the sealing surface of a pipe to be measured and less than the maximum measuring range of a movable measuring rod on the movable guide block shell, so that the measuring range of the movable measuring rod is within a measurable range. Then, the fixed measuring rod and the movable measuring rod are extended into a calibration block, and the movable measuring rod is rotated in an arc with the fixed measuring head as the center until an inflection point appears on an indicator gauge, and the indicator gauge is zeroed at the inflection point. The zeroed fixed measuring rod and the movable measuring rod are extended into the pipe to be measured, and the fixed measuring head and the movable measuring head are moved to the position to be measured. The movable measuring rod is rotated in an arc with the fixed measuring head as the center. If an inflection point appears on the indicator gauge, the value obtained at the inflection point is the actual deviation value of the sealing surface of the pipe to be measured. The measuring method is simple and the measuring result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a cross-sectional view of the mobile measuring end of the present invention.

[0027] Figure 3 It is a cross-sectional view of the installation structure of the movable guide rail block reference plate of the present invention.

[0028] Figure 4 It is a cross-sectional view of the movable guide rail block of the present invention.

[0029] Figure 5 It is a schematic diagram of the measurement structure of the present invention.

[0030] Among them, 1. indicator; 2. pressure cover; 3. second tension spring pin; 4. movable guide block; 5. movable guide block housing; 6. fixed guide block; 7. guide arm; 8. first tension spring pin; 9. fixed guide block reference plate; 10. spring; 11. screw; 12. fixed measuring rod; 13. fixed measuring head; 14. positioning measuring head; 15. movable guide block adjustment plate; 17. movable guide block reference plate; 18. linear guide bearing; 19. linear guide; 20. positioning locking screw; 21. positioning pin; 22. movable measuring rod; 23. clamping screw; 24. locking screw; 25. ejector rod; 26. ejector rod compression spring; 27. set screw; 28. fastening screw. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0032] like Figures 1 to 5 As shown, a special buckle internal thread sealing surface diameter measuring device includes a guide rail arm 7 and a movable measuring end and a fixed measuring end arranged on the guide rail arm;

[0033] The fixed measuring end includes a fixed guide rail block 6 and a fixed measuring rod 12 fixed on the fixed guide rail block 6, and a fixed measuring head 13 is provided on one side of the lower end of the fixed measuring rod 12;

[0034] The mobile measuring end includes a movable guide rail block shell 5 fixedly connected to one end of the guide rail arm 7, a sliding cavity is provided in the movable guide rail block shell 5, and a movable guide rail block 4 capable of sliding in the sliding cavity is provided in the sliding cavity, an indicator gauge 1 is fixed to one side of the movable guide rail block shell 5, and an indicator needle of the indicator gauge 1 is in contact with one side of the movable guide rail block 4; a movable measuring rod 22 is fixed on the movable guide rail block 4, and a movable measuring head is provided at the lower end of the movable measuring rod 22, a tension spring is provided between the side of the movable guide rail block shell 5 where the indicator gauge 1 is fixed and the movable guide rail block 4, and the measuring part of the mobile measuring head and the measuring part of the fixed measuring head 13 are arranged relatively to each other and in the same horizontal plane.

[0035] One end of the movable guide rail block housing 5 is connected to one end of the guide rail arm 7 through a thread, which is convenient for replacing guide rail arms of different specifications at the movable measuring end.

[0036] The other end of the movable guide rail block housing 5 is provided with an indicator meter installation hole, and the indicator meter 1 is arranged in the indicator meter installation hole. The indicator meter 1 and the movable block guide rail housing 5 are clearance-matched and locked by a locking screw.

[0037] An opening connected to the sliding cavity is provided at the upper end of the movable guide rail block shell 5, and the upper end opening of the movable guide rail block shell 5 is tightened by a pressure cover 2. Both the movable guide rail block shell 5 and the pressure cover 2 are provided with a through-hole slide groove for moving the measuring rod 22; the pressure cover 2 is fixed to the movable guide rail block shell 5 by screws.

[0038] A movable guide block adjustment plate 15 is fixed to the bottom of the sliding cavity of the movable guide block housing 5, and a linear guide bearing 18 is provided on the movable guide block adjustment plate 15. The upper end of the linear guide bearing 18 is a slideway, and a linear guide 19 is provided at the lower end of the movable guide block 4. The linear guide 19 is located in the slideway of the linear guide bearing 18, and the movable guide block 4 slides relatively through the cooperation of the linear guide 19 and the linear guide bearing 18.

[0039] The linear guide 19 is fixed to the lower end of the movable guide block 4 by screws; two parallel linear guide bearings 18 are fixed to the bottom of the sliding cavity of the movable guide block housing 5, and two parallel linear guides 19 are provided at the bottom of the movable guide block 4. There is a raised structure between the two linear guides 19, and the raised structure is located between the two linear guide bearings 18 to improve the smoothness of the sliding of the movable guide block 4 relative to the movable guide block housing 5; the linear guide bearing 18 is fixed to the movable guide adjustment plate 15 by positioning and locking screws 20, and the movable guide adjustment plate 15 is fixedly connected to the pressure cover 2 by fastening screws 28.

[0040] A first tension spring pin 8 is fixed on the movable guide rail block housing 5, and a second tension spring pin 3 is fixed on the movable guide rail block 4. The axes of the first tension spring pin 8 and the second tension spring pin 3 are parallel, and the axis of the first tension spring pin 8 is perpendicular and parallel to the moving direction of the movable guide rail block 4 relative to the movable guide rail block housing 5. The two ends of the tension spring are respectively fixed on the first tension spring pin 8 and the second tension spring pin 3; specifically, a hanging ring at one end of the tension spring is placed on the first tension spring pin 8, and the other end of the tension spring is placed on the second tension spring pin 3; in a free state, the tension spring is in a stretched state, thereby giving the movable guide rail block 4 a leftward pulling force, which is connected so that one end of the movable guide rail block 4 contacts the inner wall of one side of the movable guide rail block housing 5. At this time, the pointer measuring rod of the indicator 1 contacts the end face of the movable guide rail block 4, and the indicator 1 is compressed.

[0041] A movable guide block reference plate 17 is fixed to the bottom of the movable guide block housing 5, a spring 10 is provided between the movable guide block reference plate 17 and the movable guide block housing 5, and the movable guide block reference plate 17 and the movable guide block housing 5 are fixedly connected by screws 11; the movable guide block housing 5 and the movable guide block reference plate 17 are both provided with spring clamping grooves, and the spring is arranged in the spring clamping grooves; the gap between the movable guide block reference plate 17 and the movable guide block housing 5 is adjusted by adjusting the depth of the screw. The movable guide block housing 5 and the movable guide block reference plate 17 are also provided with positioning pin holes, and the movable guide block housing 5 and the movable guide block reference plate 17 are positioned by positioning pins 21, the positioning pins 21 and the movable guide block housing 5 are interference fit, and the positioning pins 21 and the movable guide block reference plate 17 are clearance fit.

[0042] A horizontal through hole is provided on the fixed guide block 6, and the guide arm 7 is inserted into the horizontal through hole of the fixed guide block 6. The fixed guide block 6 is provided with a locking screw 24 connected to the horizontal through hole on the fixed guide block 6, which is used to lock the fixed guide block 6 and the guide arm 7; a vertical through hole is provided on the fixed guide block 6, and the fixed measuring rod 12 is fixed in the vertical through hole. An elastic clamping device is provided in the vertical through hole of the fixed guide block 6, which is used to lock the fixed measuring rod 12.

[0043] The movable guide rail block 4 is provided with a vertical through hole, and the movable measuring rod 22 is fixed in the vertical through hole of the movable guide rail block 4 . The vertical through hole of the movable guide rail block 4 is provided with an elastic clamping device for locking the movable measuring rod 22 .

[0044] The elastic clamping device in the fixed guide block 6 and the elastic clamping device in the movable guide block 4 have the same structure; the elastic clamping device includes a clamping screw 23, a push rod 25, a push rod compression spring 26 and a set screw 27. The fixed guide block 6 and the movable guide block 4 are provided with a push rod hole and a clamping screw hole whose axes are perpendicular to the axis of the vertical through hole. The push rod hole and the clamping screw hole are coaxially located on both sides of the vertical through hole, respectively. The push rod compression spring 26 is placed in the push rod hole, and one end of the push rod 25 and the fixed measuring rod in the vertical through hole are connected. 12 or the surface of the movable measuring rod 22 is in contact, the other end of the push rod 25 is in contact with the push rod compression spring 26, the push rod compression spring 26 is sleeved on the set screw 27, the set screw 27 is set in the push rod hole, and the compression screw 23 is set in the compression screw hole. By adjusting the set screw 27 to make the push rod compression spring 26 compressed, the push rod compression spring 26 gives a pressure to the push rod 25 and the pre-tightening force of the compression screw 23 to press the fixed measuring rod 12 or the movable measuring rod 22 onto the fixed guide block 6 or the movable guide block 4;

[0045] The lower ends of the fixed measuring rod 12 and the movable measuring rod 22 are both provided with positioning measuring heads, and the positioning measuring head 14 is located at the lower end of the measuring head; the distance between the positioning measuring head 14 and the fixed measuring rod 12 or the movable measuring rod 22 and the fixed measuring head 13 is equal to the distance between the measuring reference surface of the pipeline sealing surface to be measured and the surface to be measured.

[0046] A fixed guide block reference plate 9 is fixed at the bottom of the fixed guide block 6, a spring is provided between the fixed guide block reference plate 9 and the fixed guide block 6, and the fixed guide block reference plate 9 and the fixed guide block 6 are fixedly connected by screws; the fixed guide block reference plate 9 and the fixed guide block 6 are both provided with spring slots on the screws, and the springs are arranged in the spring slots; the gap between the fixed guide block reference plate 9 and the fixed guide block 6 through the screws is adjusted by adjusting the depth of the screws; the fixed guide block reference plate 9 and the fixed guide block 6 are also provided with positioning pin holes on the screws, the fixed guide block reference plate 9 and the fixed guide block 6 are positioned by the positioning pins through the screws, the positioning pins and the fixed guide block 6 are interference fit, and the positioning pins and the fixed guide block reference plate 9 are clearance fit.

[0047] The structural principle and use steps of the present invention are further described below in conjunction with the accompanying drawings:

[0048] When in use, first, loosen the locking screw 24 and the clamping screw 23, move the fixed guide block 6 on the guide arm 7 to a distance greater than the maximum size of the sealing surface of the pipeline to be measured and less than the maximum range of the movable measuring rod 22 on the movable guide block housing 5, and the range of the movable measuring rod 22 on the movable guide block housing 5 refers to the moving distance of the movable measuring rod 22 following the movable guide block 4 in the movable guide block housing 5, and then tighten the locking screw 24; at this time, give the movable measuring rod 22 a rightward force, and the movable guide block 4 contacts the leftmost end face in the movable guide block housing 5 under the action of the tension spring, indicating that the indicator 1 is in a stretched state; place the measuring device above the calibration block so that the fixed measuring rod 12 and the movable measuring rod 22 are in contact with the leftmost end face in the movable guide block housing 5, and the indicator 1 is in a stretched state. The rod 22 extends into the calibration block (at this time, the force applied to the fixed measuring rod 12 is cancelled, and under the action of the tension spring, the measuring heads of the fixed measuring rod 12 and the movable measuring rod 22 automatically contact the measuring surface in the calibration block), adjust the height of the fixed measuring rod 12 and the movable measuring rod 22, and tighten the locking screws so that the bottoms of the fixed measuring rod 12 and the movable measuring rod 22 fit closely with the top diameter measuring surface of the calibration block; with the measuring head of the fixed measuring rod 12 as the center of the circle, the movable measuring rod 22 is swung left and right in an arc until an inflection point (i.e., the minimum value) appears on the indicator 1, and then the dial of the indicator 1 is rotated to align the zero position of the indicator 1 with the inflection point. At this time, the calibration is completed, and the measuring instrument is removed from the calibration block, and the measuring instrument as a whole is restored to a free state;

[0049] Then the distance between the fixed measuring rod 12 and the movable measuring rod 22 is compressed, and the movable measuring rod 22 drives the movable block guide 4 to move to the right on the linear guide bearing 18. At this time, the tension spring is continuously stretched, and the measuring rod of the indicator gauge 1 in contact with the movable guide block 4 also continues to move to the right. The compression amount of the indicator gauge 1 is continuously reduced. Then the measuring instrument is placed inside the pipe to be measured, so that the fixed guide block reference plate 9 and the movable guide block reference plate 17 are fitted with the end face of the pipe to be measured. Then the force applied to the movable measuring rod 22 is cancelled. Under the tension of the tension spring, the linear guide bearing 18 drives the movable guide block 4 and the movable measuring rod 22 at the movable end to move to the left until the movable measuring rod 22 The measuring head contacts the measured surface of the pipeline to be measured, and then a downward pressure is applied to the movable guide block housing 5 and the fixed guide block 6. At this time, the fixed guide block reference plate 9 and the movable guide block reference plate 17 are tightly fitted with the measured pipeline. Then, the fixed measuring end is ensured to be stationary, and the fixed measuring head of the fixed measuring end is used as the center of the circle, and the movable measuring head of the movable measuring end is used as the movable end to make an arc swing. At this time, the movable measuring rod 22 of the movable measuring end drives the movable guide block 4 to move back and forth on the linear guide bearing 18, and at the same time, the measuring rod of the indicator 1 moves left and right. An inflection point will appear on the indicator 1, which is the actual deviation value of the sealing surface of the pipeline to be measured. If the inflection point here is zero, there is no deviation on the sealing surface of the pipeline to be measured.

Claims

1. A special buckle internal thread sealing surface diameter measuring device, characterized in that: It comprises a guide rail arm (7) and a movable measuring end and a fixed measuring end arranged on the guide rail arm; The fixed measuring end comprises a fixed guide rail block (6) and a fixed measuring rod (12) fixed on the fixed guide rail block (6); a fixed measuring head (13) and a positioning measuring head (14) are provided on one side of the lower end of the fixed measuring rod (12); The movable measuring end comprises a movable guide rail block housing (5) fixedly connected to one end of a guide rail arm (7); a sliding cavity is provided in the movable guide rail block housing (5); a movable guide rail block (4) capable of sliding in the sliding cavity is provided in the sliding cavity; an indicator gauge (1) is fixed to one side of the movable guide rail block housing (5); a measuring rod of the indicator gauge (1) contacts one side of the movable guide rail block (4); a movable measuring rod (22) is fixed to the movable guide rail block (4); a movable measuring head is provided at the lower end of the movable measuring rod (22); a tension spring is provided between one side of the movable guide rail block housing (5) and the movable guide rail block (4); a measuring portion of the movable measuring head and a measuring portion of the fixed measuring head (13) are arranged opposite to each other and in the same horizontal plane.

2. A special buckle internal thread sealing surface diameter measuring device according to claim 1, characterized in that: The upper end of the movable guide rail block housing (5) is provided with an opening communicating with the sliding cavity. The upper end opening of the movable guide rail block housing (5) is pressed by a pressure cover (2). Both the movable guide rail block housing (5) and the pressure cover (2) are provided with a through-hole slide groove for moving the measuring rod (22). The pressure cover (2) is fixed to the movable guide rail block housing (5) by screws.

3. A special buckle internal thread sealing surface diameter measuring device according to claim 1, characterized in that: A movable guide block adjusting plate (15) is fixed at the bottom of the sliding cavity of the movable guide block housing (5), a linear guide bearing (18) is arranged on the movable guide block adjusting plate (15), the upper end of the linear guide bearing (18) is a slideway, a linear guide (19) is arranged at the lower end of the movable guide block (4), the linear guide (19) is located in the slideway of the linear guide bearing (18), and the movable guide block (4) slides relatively through the cooperation between the linear guide (19) and the linear guide bearing (18).

4. A special buckle internal thread sealing surface diameter measuring device according to claim 3, characterized in that: The linear guide rail (19) is fixed to the lower end of the movable guide rail block (4) by means of screws; two parallel linear guide rail bearings (18) are fixed to the bottom of the sliding cavity of the movable guide rail block housing (5); two parallel linear guide rails (19) are arranged at the bottom of the movable guide rail block (4); a convex structure is provided between the two linear guide rails (19); the convex structure is located between the two linear guide rail bearings (18); the linear guide bearings (18) are fixed to the movable guide rail adjustment plate (15) by means of positioning screws (20).

5. The device for measuring the diameter of the internal thread sealing surface of a special buckle according to claim 1 is characterized in that: A first tension spring pin (8) is fixed on the movable guide rail block housing (5), and a second tension spring pin (3) is fixed on the movable guide rail block (4). The axes of the first tension spring pin (8) and the second tension spring pin (3) are parallel, and the axis of the first tension spring pin (8) is parallel to the moving direction of the movable guide rail block (4) relative to the movable guide rail block housing (5). Two ends of the tension spring are respectively fixed on the first tension spring pin (8) and the second tension spring pin (3).

6. A special buckle internal thread sealing surface diameter measuring device according to claim 1, characterized in that: A movable guide block reference plate (17) is fixed to the bottom of the movable guide block housing (5), a spring (10) is provided between the movable guide block reference plate (17) and the movable guide block housing (5), and the movable guide block reference plate (17) and the movable guide block housing (5) are fixedly connected by screws (11).

7. A special buckle internal thread sealing surface diameter measuring device according to claim 1, characterized in that: The fixed guide rail block (6) is provided with a horizontal through hole, the guide rail arm (7) is inserted into the horizontal through hole of the fixed guide rail block (6), and the fixed guide rail block (6) is provided with a locking screw (24) communicating with the horizontal through hole of the fixed guide rail block (6) and used to lock the fixed guide rail block (6) and the guide rail arm (7); the fixed guide rail block (6) is provided with a vertical through hole, the fixed measuring rod (12) is fixed in the vertical through hole, and the vertical through hole of the fixed guide rail block (6) is provided with an elastic clamping device for locking the fixed measuring rod (12).

8. The device for measuring the diameter of the internal thread sealing surface of a special buckle according to claim 1, characterized in that: A vertical through hole is provided on the movable guide rail block (4), a movable measuring rod (22) is arranged in the vertical through hole of the movable guide rail block (4), and an elastic clamping device for locking the movable measuring rod (22) is provided in the vertical through hole of the movable guide rail block (4).

9. A special buckle internal thread sealing surface diameter measuring device according to claim 7 or 8, characterized in that: The elastic clamping device comprises a clamping screw (23), a push rod (25), a push rod compression spring (26) and a set screw (27). The fixed guide block (6) and the movable guide block (4) are provided with a push rod hole and a clamping screw hole whose axes are perpendicular to the axis of the vertical through hole. The push rod hole and the clamping screw hole are coaxially located on both sides of the vertical through hole. The push rod compression spring (26) is placed in the push rod hole. One end of the push rod contacts the surface of the fixed measuring rod (12) or the movable measuring rod (22) in the vertical through hole. The other end of the push rod (25) contacts the push rod compression spring (26). The push rod compression spring (26) is sleeved on the set screw (27). The set screw is arranged in the push rod hole. The clamping screw (23) is arranged in the clamping screw hole.

10. A method for measuring the diameter of a special thread sealing surface based on the measuring device of claim 1, characterized in that: The following steps are involved: Step 1), fix the fixed guide rail block on the guide rail arm, so that the distance between the fixed guide rail block and the movable guide rail block housing is greater than the maximum size of the pipeline sealing surface to be measured and less than the maximum range of the movable measuring rod on the movable guide rail block housing; Step 2), then extend the fixed measuring rod and the mobile measuring rod into the calibration block, rotate the mobile measuring rod in an arc with the fixed measuring head as the center until an inflection point appears on the indicator, and adjust the indicator to zero at the inflection point; Step 3) Insert the zero-adjusted fixed measuring rod and the movable measuring rod into the pipe to be measured, move the fixed measuring head and the movable measuring head to the measured part, rotate the movable measuring rod in an arc with the fixed measuring head as the center, if an inflection point appears on the indicator, the value obtained at the inflection point is the actual deviation value of the sealing surface of the pipe to be measured.

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