Pressure measuring element positioning device

Abstract

The utility model relates to the technical field of pressure measuring element positioning, and provides a pressure measuring element positioning device which comprises two distance measuring scrapers which are arranged in a relative movement mode, and the side faces of the distance measuring scrapers are used for abutting against the inner wall of a pressure measuring pipeline in a sliding mode. The number of the positioning plates is two, the positioning plates are hinged to the ends of the distance measuring scrapers, the positioning plates are flush with the side faces, abutting against the inner wall of the pressure measuring pipeline, of the distance measuring scrapers, after the positioning plates rotate, the positioning plates and the distance measuring scrapers form a V-shaped structure, and the V-shaped structure is used for abutting against the outer side wall of the pressure measuring pipeline. By means of the technical scheme, the problems that in the prior art, the installation position of the pressure measuring element is inconvenient to confirm, and positioning is inaccurate are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure measuring element positioning, in particular to a pressure measuring element positioning device. Background Art

[0002] When the fluid medium flows in the pipeline, the pressure can provide a prompt for the operating parameters, so as to facilitate the regulation of the equipment, achieve a better working state, and avoid production safety hazards. In order to accurately regulate, it is necessary to measure the pressure more accurately. The existing pressure measuring element is generally set on the pressure measuring pipeline to monitor the internal pressure. Common knowledge has disclosed the precautions when installing the pressure measuring element. For example, there should be no protrusions on the inner wall of the pressure measuring pipeline, which is responsible for affecting the pressure measurement. When taking pressure near the front of the valve, the distance between the valves should be greater than 2 times the diameter of the pipeline (generally refers to the inner diameter of the pipeline); if the pressure taking port is behind the valve, the distance from the valve should be greater than 3 times the diameter of the pipeline. Usually, when installing the pressure measuring element near the valve, it is sufficient to ensure that it is greater than the minimum specification requirements by lengthening the interval. However, when the installation space is limited, it is necessary to measure and locate the pressure measuring element to ensure that the installation position meets the requirements and ensure accurate numerical measurement. However, in the prior art, it is not convenient to detect whether there are protrusions on the inner wall of the pressure measuring pipeline. At the same time, it is not convenient to measure the inner diameter of the pipeline and determine the installation position according to the spacing requirements, resulting in inconvenient confirmation of the installation position of the pressure measuring element and inaccurate positioning. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pressure measuring element positioning device in view of the above-mentioned technical deficiencies, which solves the problems of inconvenient confirmation of the installation position of the pressure measuring element and inaccurate positioning.

[0004] The technical solution adopted by the utility model is: to provide a pressure measuring element positioning device for detecting the inner wall protrusion and diameter of the pressure measuring pipeline, comprising:

[0005] There are two distance measuring scrapers, the two distance measuring scrapers are arranged to move relative to each other, and the side surfaces of the distance measuring scrapers are used to slide against the inner wall of the pressure measuring pipe;

[0006] There are two positioning plates, and each end of the ranging scraper is hingedly provided with the positioning plate. The positioning plate and the ranging scraper are flush with the side of the inner wall of the pressure measuring pipe. After the positioning plate is rotated, it forms a "V" shape structure with the ranging scraper, and the "V" shape structure is used to abut against the outer wall of the pressure measuring pipe.

[0007] Further optimization of this technical solution also includes:

[0008] A threaded pipe, wherein the threaded pipe has a positive thread portion and a negative thread portion inside, and the positive thread portion is located on one side of the negative thread portion;

[0009] There are two threaded sliders, the two threaded sliders are arranged to move relative to each other, and the positive thread part and the negative thread part are respectively threadedly connected with the two threaded sliders;

[0010] The moving rods are provided with two, one end of the moving rod is arranged on the threaded slider, and the distance measuring scraper is arranged on the other end of the moving rod.

[0011] Further optimization of this technical solution also includes:

[0012] Pedestal;

[0013] There are two position limiting tubes, which are respectively arranged at two ends of the base, each of which has the moving rod slidably arranged inside it, and the threaded tube is located between the two position limiting tubes.

[0014] To further optimize the technical solution, the distance measuring scraper is located beside the end of the moving rod, and the distance measuring scraper is arranged to move relative to the moving rod parallel to the axis direction of the threaded pipe.

[0015] Further optimizing the technical solution, the end of the moving rod has a mounting groove; and further comprising:

[0016] A movable seat is arranged in the installation groove in parallel to the axis direction of the threaded pipe, and the distance measuring scraper is arranged on the movable seat. The distance measuring scraper is arranged beside the end of the movable rod by moving through the movable seat;

[0017] A compression spring is arranged in the installation groove, one end of which acts on the movable seat and the other end of which acts on the inner wall of the installation groove, and is used to provide pressure for the distance measuring scraper to abut against the inner wall of the pressure measuring pipeline.

[0018] To further optimize the technical solution, the distance measuring scraper is fixedly arranged on the moving seat, the end of the distance measuring scraper has a main shaft, the end of the positioning plate has a rotating tube, and the rotating tube is sleeved on the main shaft.

[0019] To further optimize the technical solution, the positioning plate further comprises a socket, and the socket is located on the side of the positioning plate; and further comprises:

[0020] A pen holder, the pen holder having a plug-in tube and a plug-in board, the plug-in board is located at one side of the plug-in tube, and the plug-in board is used for plugging into the socket;

[0021] A marking pen is slidably sleeved in the plug-in tube and is used for drawing lines on the outer side wall of the pressure measuring pipe.

[0022] Further optimization of this technical solution also includes:

[0023] The telescopic rod has a movable end, and the base is arranged at the movable end.

[0024] Further optimization of this technical solution also includes:

[0025] The mounting seat is arranged on the mobile end, the base is plugged and arranged on the mounting seat, and the base and the mounting seat are connected by bolts.

[0026] Further optimization of this technical solution also includes:

[0027] There are two gaskets, which are used to be inserted into the installation groove and are located between the movable seat and the inner wall of the installation groove parallel to the axis direction of the threaded pipe.

[0028] The beneficial effects of the utility model are:

[0029] 1. When located inside the pressure measuring pipe, the two distance measuring scrapers move relative to each other to the maximum distance from the inner wall of the pressure measuring pipe, that is, the inner diameter of the pressure measuring pipe can be detected. The distance measuring scrapers slide and abut against the inner wall of the pressure measuring pipe. The two distance measuring scrapers can rotate coaxially, and the sides of the distance measuring scrapers slide along the inner wall of the pressure measuring pipe. If there is a large protrusion on the inner wall of the pressure measuring pipe, it will be hindered and unable to continue sliding, which means that there is a protrusion on the inner wall of the pressure measuring pipe. You can select a pressure measuring section or set the pressure tapping port before the protrusion. If the connection between the protrusion and the inner wall of the pressure measuring pipe is weak, it can be scraped out by the distance measuring scraper to eliminate the impact. The side of the positioning plate is flush with the side of the distance measuring scraper, and at this time the positioning plate is set parallel to the pressure measuring pipe, and both can abut against the inner wall of the pressure measuring pipe. The positioning plate extends the length of the distance measuring scraper, reducing the omission of the inner wall detection of the pressure measuring pipe during the movement.

[0030] 2. When located outside the pressure measuring pipe, the positioning plate forms a "V"-shaped structure with the distance measuring scraper after rotation, and can be mounted on the outer wall of the pressure measuring pipe. The installation is stable and used to measure the multiple intervals of the inner diameter of the pressure measuring pipe. The interval positioning is more convenient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the utility model;

[0032] Figure 2 for Figure 1 A schematic diagram of a local enlarged structure at location I;

[0033] Figure 3 For this utility model Figure 1 A schematic diagram of a top view structure;

[0034] Figure 4 for Figure 3The schematic diagram of the structure is a cross-section at AA in the middle;

[0035] Figure 5 for Figure 4 Schematic diagram of the local enlarged structure at II in the middle;

[0036] Figure 6 This is a schematic diagram of the structure of the utility model in the external state of the pressure measuring pipeline;

[0037] Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure at position III in the middle;

[0038] Figure 8 This is a schematic diagram of the mounting base structure of the utility model;

[0039] Fig. 9 for Figure 8 A schematic diagram of the local enlarged structure at IV in the middle;

[0040] Explanation of marks in the figure: 1. Distance-measuring scraper; 101. Spindle; 2. Positioning plate; 201. Rotating tube; 202. Socket; 3. Threaded tube; 301. Positive threaded portion; 302. Negative threaded portion; 4. Threaded slider; 5. Moving rod; 501. Mounting slot; 5011. Buffer interval; 502. Storage slot; 6. Base; 7. Limiting tube; 8. Moving seat; 9. Compression spring; 10. Pen holder; 1001. Plug-in tube; 1002. Plug-in board; 11. Drawing pen; 12. Telescopic rod; 1201. Moving end; 13. Mounting seat; 14. Bolt; 15. Gasket; 1501. Plug-in portion; 1502. Hand-held portion. DETAILED DESCRIPTION

[0041] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0043] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0044] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] like Figure 1-9 As shown, the pressure measuring element positioning device is used to detect the inner wall protrusion and diameter of the pressure measuring pipeline, including: two distance measuring scrapers 1, the two distance measuring scrapers 1 are relatively movable, and the side of the distance measuring scraper 1 is used to slide against the inner wall of the pressure measuring pipeline; two positioning plates 2, each end of the distance measuring scraper 1 is hingedly provided with a positioning plate 2, the positioning plate 2 and the distance measuring scraper 1 are flush with the side of the inner wall of the pressure measuring pipeline, and after the positioning plate 2 rotates, it forms a "V"-shaped structure with the distance measuring scraper 1, and the "V"-shaped structure is used to abut against the outer wall of the pressure measuring pipeline. It also includes: a threaded pipe 3, the threaded pipe 3 has a positive thread part 301 and a negative thread part 302 inside, and the positive thread part 301 is located on one side of the negative thread part 302; two threaded sliders 4, the two threaded sliders 4 are relatively movable, and the positive thread part 301 and the negative thread part 302 are respectively threadedly connected with the two threaded sliders 4; two moving rods 5, one end of the moving rod 5 is set on the threaded slider 4, and the distance measuring scraper 1 is set at the other end of the moving rod 5. It also includes: a base 6; two limiting tubes 7, which are respectively arranged at both ends of the base 6, each limiting tube 7 has a moving rod 5 slidably arranged therein, and the threaded tube 3 is located between the two limiting tubes 7.

[0046] When in use, take the case where the pressure measuring element is set near the valve and the installation position interval measurement is required as an example. First, place the distance measuring scraper 1 inside the pressure measuring pipe, measure the inner diameter and detect whether there are protrusions on the inner wall of the pressure measuring pipe. The threaded tube 3 cooperates with the two threaded sliders 4 to achieve the relative movement of the two distance measuring scrapers 1, so that the two distance measuring scrapers 1 are relatively far away and abut against the inner wall of the pressure measuring pipe at the same time, and when they are at the farthest interval (similar to the abutment of a micrometer to measure the inner diameter, the purpose of detecting the inner diameter can be achieved), the distance between the outer side surfaces of the two distance measuring scrapers 1 (the outer side surface is the side surface where the distance measuring scraper 1 abuts against the inner wall of the pressure measuring pipe) is the inner wall diameter of the pressure measuring pipe. The force of the distance scraper 1 abutting against the inner wall of the pressure measuring pipe is relatively small, which facilitates the sliding of the distance scraper 1 along the inner wall of the pressure measuring pipe. After the distance scraper 1 abuts against the inner wall of the pressure measuring pipe, the two distance scrapers 1 are rotated synchronously, such as by hand rotating the threaded tube 3. When the distance scraper 1 slides along the inner wall of the pipe, if there is a protrusion on the inner wall of the pressure measuring pipe, it will be blocked and unable to continue to rotate. The human hand will feel the obstruction, and it can be judged that there is a protrusion. It is necessary to detect the protrusion within a certain distance of the inner wall of the pressure measuring pipe to better select the pressure tapping port. During the rotation process, the distance scraper 1 also needs to move along the axis direction of the pressure measuring pipe toward the inside of the pressure measuring pipe to continuously detect the protrusion. When there is a protrusion, the front end of the distance scraper 1 generally contacts the protrusion first. The approximate position of the protrusion can be judged according to the distance of the distance scraper 1, so as to avoid the protrusion or set the pressure tapping port before the protrusion. If there is no problem in detecting the internal protrusion and it is located near the valve, the position interval of the pressure measuring element installation can be measured.

[0047] like Figure 6 , 7 As shown, a "V"-shaped structure is displayed. When measuring the installation position interval, take out the distance scraper 1 from the pressure measuring pipe to the inside, keep the relative positions of the two distance scrapers 1 different, that is, the inner diameter of the pipe, rotate the two positioning plates 2, and there is an angle between the positioning plates 2 and the distance scraper 1, forming a "V"-shaped structure. The openings of the two "V"-shaped structures can be stably erected on the outer wall of the pressure measuring pipe, and the opening of one "V"-shaped structure abuts against the outer wall of the pressure measuring pipe and the outer side abuts against the valve, and the opening of the other "V"-shaped structure abuts against the outer wall of the pressure measuring pipe, and the position of the outer side of the "V"-shaped structure corresponds to the position of one times the inner diameter of the pressure measuring pipe, and can be pressed at the position of 1 times the inner diameter of the pressure measuring pipe with the help of fingers, and then move the positioning device so that the outer side of one "V"-shaped structure is facing the position of 1 times the inner diameter of the pressure measuring pipe, and the outer side of the other "V"-shaped structure corresponds to the position of 2 times the inner diameter of the pressure measuring pipe. By analogy, the position of 3 times the inner diameter of the pressure measuring pipe can also be measured. After the position is determined, to ensure compliance with the installation and operation specifications, the pressure tapping port can be set farther than the measured position. This ensures that the installation position is accurate and in compliance with the specifications when there is insufficient space and close to the valve, and that the operation is convenient.

[0048] Each threaded slider 4 is provided with a moving rod 5, and the threaded connection between the threaded tube 3 and the threaded slider 4 has good axial self-locking performance. The base 6 fixedly connects the two limiting tubes 7, the interior of the limiting tube 7 can be a quadrilateral channel, and the moving rod 5 can be a quadrangular prism structure that is slidably adapted to the quadrilateral channel.

[0049] Furthermore, the distance measuring scraper 1 is located beside the end of the moving rod 5, and the distance measuring scraper 1 is arranged to move relative to the moving rod 5 in parallel to the axial direction of the threaded tube 3. The end of the moving rod 5 has a mounting groove 501; it also includes: a moving seat 8, which is arranged in the mounting groove 501 in parallel to the axial direction of the threaded tube 3, and the distance measuring scraper 1 is arranged on the moving seat 8. The distance measuring scraper 1 is arranged beside the end of the moving rod 5 by the moving seat 8; a compression spring 9 is arranged in the mounting groove 501, one end of which acts on the moving seat 8, and the other end acts on the inner wall of the mounting groove 501, which is used to provide pressure for the distance measuring scraper 1 to abut against the inner wall of the pressure measuring pipe.

[0050] When in use, the distance measuring scraper 1 moves relative to the moving rod 5, and the moving distance is small enough to adapt to the fluctuation change within the normal diameter range of the inner wall of the pressure measuring pipe. The inner wall of the pressure measuring pipe may not be a perfect circular structure, so the diameter error within a small range is a normal phenomenon. The moving seat 8 is set in the installation groove 501, parallel to the axial direction of the threaded pipe 3, and there is a buffer interval 5011 between the moving seat 8 and the inner wall of the installation groove 501. The elastic force of the compression spring 9 pushes the moving seat 8 outward, so that the outer side of the distance measuring scraper 1 abuts against the inner wall of the pressure measuring pipe. When the diameter of the inner wall of the pressure measuring pipe is reduced, the moving seat 8 moves to squeeze the compression spring 9, and the two distance measuring scrapers 1 are relatively close to adapt to the reduction of the inner diameter of the pressure measuring pipe, avoiding the misjudgment of the existence of protrusions due to the reduction of the inner diameter. The detection of protrusions is smoother and more accurate. The diameter reduction referred to here refers to a small range change, which avoids the presence of protrusions that may cause relative movement of the pressure measuring scraper and lead to misjudgment, and the side of the ranging scraper 1 can be a right-angled side. If there is a protrusion, the blocking effect will be obvious (measuring the diameter of the inner wall of the pressure measuring pipe does not require extremely accurate measurement. Therefore, the smaller value of the inner diameter measurement caused by the right-angled side where the ranging scraper 1 abuts the inner wall of the pressure measuring pipe can be ignored).

[0051] Furthermore, the distance measuring scraper 1 is fixedly arranged on the moving seat 8 , the end of the distance measuring scraper 1 has a main shaft 101 , the end of the positioning plate 2 has a rotating tube 201 , and the rotating tube 201 is sleeved on the main shaft 101 .

[0052] When in use, the positioning plate 2 forms a "V"-shaped structure with the ranging scraper 1 after rotation. This can be achieved by sleeve-connecting the end of the positioning plate 2 with the main shaft 101 at the end of the ranging scraper 1 through the rotating tube 201. After rotating to a certain angle, the end side of the positioning plate 2 abuts against the end side of the ranging scraper 1, and the rotation is restricted. At this time, by pinching the ranging scraper 1 and the positioning plate 2 with your fingers, the "V"-shaped structure can be maintained, and it can be more stably installed on the outside of the pressure measuring pipeline.

[0053] Furthermore, the positioning plate 2 also has a socket 202, which is located on the side of the positioning plate 2; it also includes: a pen holder 10, the pen holder 10 has a plug-in tube 1001 and a plug-in board 1002, the plug-in board 1002 is located on one side of the plug-in tube 1001, and the plug-in board 1002 is used for plugging into the socket 202; a marking pen 11, which is slidably sleeved in the plug-in tube 1001, and the marking pen 11 is used to draw lines on the outer wall of the pressure measuring pipe.

[0054] like Figure 6-9 As shown, when in use, in addition to the above-mentioned finger pressing to indicate the position measured by the distance measuring scraper 1, the measuring position can also be directly drawn with a marker 11, which is convenient and accurate to operate, and the marking line is left to facilitate the later connection and installation of the pressure measuring element. The marker 11 is a plug-in accessory, which is installed and used when the interval measurement is performed outside the pressure measuring pipeline. The plug-in board 1002 of the pen holder 10 is plugged into the socket 202 on the positioning plate 2, and after the plug-in, the axis position of the marker 11 (i.e., the pen tip position) is flush with the outer side surface of the positioning member (i.e., the side abutting against the inner wall of the pressure measuring pipeline), so that the center position of the drawing line is directly opposite to the outer side surface of the distance measuring scraper 1, and the drawing line reference is more accurate. The positioning of the pen tip can be achieved by setting the position of the socket 202 and the cooperation with the pen holder 10. The plug-in board 1002 is located on the outer wall of the plug-in tube 1001 and has a "P"-shaped structure. The marking pen 11 can slide in the plug-in tube 1001 to better adapt to pressure measuring pipes with different outer diameters. The "V"-shaped structure can adapt to pressure measuring pipes with different outer diameters. The installation is relatively stable. Move the marking pen 11 so that its tip contacts the outer wall of the pressure measuring pipe, and then rotate the "V"-shaped structure or the rotating positioning device around the pressure measuring pipe to draw a line on the outer wall of the pressure measuring pipe.

[0055] Furthermore, it also includes: a telescopic rod 12 having a movable end 1201 , and a base 6 is arranged at the movable end 1201 .

[0056] When in use, the telescopic rod 12 can drive the distance measuring scraper 1 to move and rotate inside the pressure measuring pipe. The telescopic rod 12 is a telescopic structure, which is convenient for adapting to detection needs at different depths and is easy to store.

[0057] Furthermore, it also includes: a mounting seat 13, which is arranged on the mobile end 1201, and the base 6 is plugged into the mounting seat 13, and the base 6 and the mounting seat 13 are connected by bolts 14.

[0058] When in use, the base 6 can be fixedly set on the mobile end 1201, or it can be installed on the mobile end 1201 in a detachable manner, so as to facilitate the replacement of different ranging scrapers 1. The ranging scraper 1, the base 6 and the threaded tube 3 and other structures can be replaced as a whole to adapt to different inner diameters of pressure measuring pipes.

[0059] Furthermore, it also includes: two gaskets 15, which are used to be inserted into the installation groove 501 and are located between the movable seat 8 and the inner wall of the installation groove 501 parallel to the axial direction of the threaded tube 3.

[0060] When in use, when the diameter adaptation measurement is performed inside the pressure measuring pipe, the gasket 15 can be inserted into the buffer interval 5011 between the moving seat 8 and the inner wall of the mounting groove 501, leaving a buffer margin, and supporting stability, so that the distance measuring scraper 1 will not compress the compression spring 9 when it abuts against the inner wall of the pressure measuring pipe. After rotating the threaded tube 3 to measure the maximum diameter of the inner wall of the pressure measuring pipe, the gasket 15 can be pulled out of the buffer interval 5011 to release the buffer margin. When the inner diameter of the pressure measuring pipe is reduced, the distance measuring scraper 1 can move. The gasket 15 can be set separately, or a storage groove 502 can be opened on the moving rod 5. When not in use, the gasket 15 is inserted into the storage groove 502. The gasket 15 may include a plug-in portion 1501 and a hand-held portion 1502. The plug-in portion 1501 is a plate-shaped structure, and the hand-held portion 1502 is a ring-shaped structure, which is convenient for hand-holding and pulling.

[0061] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A pressure measuring element positioning device for detecting inner wall protrusions and diameters of a pressure measuring pipeline, characterized in that: include: There are two distance measuring scrapers (1), the two distance measuring scrapers (1) are arranged to move relative to each other, and the side surfaces of the distance measuring scrapers (1) are used to slide against the inner wall of the pressure measuring pipe; There are two positioning plates (2), each end of the distance measuring scraper (1) is hingedly provided with the positioning plate (2), the positioning plate (2) and the distance measuring scraper (1) are abutted against the side of the inner wall of the pressure measuring pipe flush, after the positioning plate (2) is rotated, it forms a "V"-shaped structure with the distance measuring scraper (1), and the "V"-shaped structure is used to abut against the outer wall of the pressure measuring pipe.

2. The pressure measuring element positioning device according to claim 1, characterized in that: Also includes: A threaded pipe (3), wherein the threaded pipe (3) has a positive thread portion (301) and a negative thread portion (302) inside, and the positive thread portion (301) is located on one side of the negative thread portion (302); The threaded sliders (4) are provided with two, the two threaded sliders (4) are arranged to move relative to each other, and the positive thread portion (301) and the negative thread portion (302) are respectively threadedly connected to the two threaded sliders (4); The moving rod (5) has two ends, one end of the moving rod (5) is arranged on the threaded slider (4), and the distance measuring scraper (1) is arranged on the other end of the moving rod (5).

3. The pressure measuring element positioning device according to claim 2, characterized in that: Also includes: Base (6); The limiting tubes (7) are provided with two, the two limiting tubes (7) are respectively arranged at two ends of the base (6), the moving rod (5) is slidably arranged in each limiting tube (7), and the threaded tube (3) is located between the two limiting tubes (7).

4. The pressure measuring element positioning device according to claim 2, characterized in that: The distance measuring scraper (1) is located beside the end of the moving rod (5), and the distance measuring scraper (1) is arranged to move relative to the moving rod (5) in parallel with the axial direction of the threaded tube (3).

5. The pressure measuring element positioning device according to claim 4, characterized in that: The end of the moving rod (5) is provided with a mounting groove (501); and further comprising: A movable seat (8) is arranged in the mounting groove (501) so as to be movable parallel to the axial direction of the threaded tube (3); the distance measuring scraper (1) is arranged on the movable seat (8); and the distance measuring scraper (1) is arranged to be movable by the movable seat (8) and to be arranged beside the end of the movable rod (5); A compression spring (9) is arranged in the installation groove (501), one end of which acts on the movable seat (8) and the other end of which acts on the inner wall of the installation groove (501), and is used to provide pressure for the distance measuring scraper (1) to abut against the inner wall of the pressure measuring pipe.

6. The pressure measuring element positioning device according to claim 5, characterized in that: The distance measuring scraper (1) is fixedly arranged on the movable seat (8), the end of the distance measuring scraper (1) has a main shaft (101), the end of the positioning plate (2) has a rotating tube (201), and the rotating tube (201) is sleeved on the main shaft (101).

7. The pressure measuring element positioning device according to claim 1, characterized in that: The positioning plate (2) further comprises a socket (202), wherein the socket (202) is located on a side surface of the positioning plate (2); and further comprises: A pen holder (10), the pen holder (10) comprising a plug-in tube (1001) and a plug-in board (1002), the plug-in board (1002) being located on one side of the plug-in tube (1001), and the plug-in board (1002) being used for plugging into the socket (202); A marking pen (11) is slidably sleeved in the plug tube (1001), and the marking pen (11) is used to draw lines on the outer side wall of the pressure measuring pipe.

8. The pressure measuring element positioning device according to claim 3, characterized in that: Also includes: The telescopic rod (12) has a movable end (1201), and the base (6) is arranged on the movable end (1201).

9. The pressure measuring element positioning device according to claim 8, characterized in that: Also includes: The mounting seat (13) is arranged on the mobile end (1201), the base (6) is plugged into the mounting seat (13), and the base (6) and the mounting seat (13) are connected by bolts (14).

10. The pressure measuring element positioning device according to claim 5, characterized in that: Also includes: There are two gaskets (15), which are used to be inserted into the installation groove (501) and are located between the movable seat (8) and the inner wall of the installation groove (501) parallel to the axial direction of the threaded tube (3).

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