Device for measuring pipeline pressure

Abstract

The invention discloses a device for measuring the pressure of a pipeline, and belongs to the technical field of pressure detection of fluid in the pipeline. A device for measuring pipeline pressure comprises an annular walking mechanism moving in the axial direction of the interior of a pipeline, a pressure measuring mechanism used for measuring different radial angle positions of the pipeline and located in the annular walking mechanism, and a traction mechanism used for driving the annular walking mechanism to move. The two traction mechanisms are located at the two axial ends of the pipeline correspondingly. The method has the advantages that the leakage point of the pipeline can be found more timely, and the construction time of later repair is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of fluid pressure detection in pipelines, and in particular to a device for measuring pipeline pressure. Background Art

[0003] Currently, the more common detection method is pressure detection, which determines whether there is a pipeline leak by detecting the change in fluid pressure in the pipeline. However, it is impossible to accurately determine the location of the leak. For pipelines used in some important facilities, buildings, and regions, especially those buried underground or embedded in buildings, if the leakage cannot be determined in a timely and accurate manner, it will cause significant economic and life losses and seriously affect property and life safety. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the pipeline pressure detection equipment in the prior art cannot accurately determine the pipeline leakage position, and to propose a device for measuring pipeline pressure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device for measuring pipeline pressure includes an annular traveling mechanism that moves along the axial direction inside the pipeline, a pressure measuring mechanism for measuring pressures at different radial angles of the pipeline, the pressure measuring mechanism being located inside the annular traveling mechanism, and a traction mechanism for driving the annular traveling mechanism to move, the two traction mechanisms being located at the two axial ends of the pipeline respectively.

[0006] Furthermore, the pressure measuring mechanism comprises a blade and a first water pressure sensor. A blade is radially arranged inside the annular traveling mechanism, and a plurality of first water pressure sensors are radially arranged on the blade in the annular traveling mechanism.

[0007] Furthermore, it also includes a support arm and a first rotating shaft. The support arm is arranged on the inner side of the annular walking mechanism. The blade is rotatably mounted on the support arm through the first rotating shaft in the circumferential direction of the annular walking mechanism. The traction mechanism is connected to the support arm.

[0008] Furthermore, a second groove corresponding to the blade is arranged on the inner side of the annular walking mechanism, a second ball is arranged on one end of the blade close to the second groove, and the blade is rollingly connected to the second groove via the second ball.

[0009] Furthermore, a first gyroscope is disposed on the first rotating shaft, and a second gyroscope is disposed on the supporting arm.

[0010] Furthermore, the annular walking mechanism includes an annular outer ring coaxially arranged with the pipeline, and a first ball installed between the outer wall of the annular outer ring and the inner wall of the pipeline, and the annular outer ring and the inner wall of the pipeline are rollingly connected via the first ball.

[0011] Furthermore, a ball groove corresponding to the first ball is provided on the annular outer ring, an annular inner ring is provided inside the annular outer ring, a first groove corresponding to the first ball is provided on the outer wall of the annular inner ring, and the annular inner ring supports the first ball outwardly through the first groove and is rotatably installed in the ball groove.

[0012] Furthermore, an expansion joint is provided on the annular inner ring along the axial direction of the annular outer ring.

[0013] Furthermore, the traction mechanism includes a traction cable, a shell, a drum, and a drive motor. The shell is sealed to the pipeline to be measured, the drum is rotatably installed inside the shell, the drum is connected to the working end of the drive motor, and the annular walking mechanism or the pressure measuring mechanism is connected to the drum via a traction cable.

[0014] Furthermore, there are a plurality of blades, and the plurality of blades are radially distributed. The blades are fixedly connected to the annular traveling mechanism, and the annular traveling mechanism or the pressure measuring mechanism is connected to the rotating drum via a traction cable.

[0015] Compared with the prior art, the present invention provides a device for measuring pipeline pressure, which has the following beneficial effects: The present invention discloses a device for measuring pipeline pressure. When in use, an annular walking mechanism is installed in a pipeline whose pressure is to be measured, and a traction mechanism is installed outside the pipeline. The annular walking mechanism is driven by the traction mechanism to move in the pipeline. During the movement, the pressure at different radial angles of the pipeline is measured by the pressure measuring mechanism. When a pipeline leaks, the water pressure at the leaking position is lower than the normal water pressure. Therefore, the position of the leaking position in the pipeline can be accurately determined, thereby improving the determination accuracy. In addition, the device is driven by the traction mechanism and is used for pressure detection in a long-distance pipeline.

[0016] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic top view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the pressure measurement mechanism of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement of part A; Figure 5 It is a schematic diagram of the structure of the rotating blade of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the structure of part B in the middle is enlarged; Figure 7 It is a three-dimensional schematic diagram of the cross-sectional structure of the pressure measuring mechanism of the present invention; Figure 8 For the present invention Figure 7 The enlarged schematic diagram of the structure of part C in the middle; Fig. 9 It is a schematic diagram of the explosion effect of the annular walking mechanism of the present invention; Fig.10 It is a schematic diagram of the traction mechanism structure of the present invention; Fig.11 It is a schematic diagram of the effect of fixed connection between the blade and the annular outer ring of the present invention; Fig.12 It is a schematic structural diagram of the third water pressure sensor of the present invention.

[0018] In the figure: 1. Annular walking mechanism; 101. Annular outer ring; 102. First ball; 103. Ball groove; 104. Annular inner ring; 105. Expansion joint; 106. First groove; 2. Pressure measuring mechanism; 201. Support arm; 202. Blade; 203. First water pressure sensor; 204. Second groove; 205. Rotating shaft seat; 206. First rotating shaft; 207. Axis hole; 208. First gyroscope; 209. Second gyroscope; 210. Through groove; 211. Second ball; 212. Second water pressure sensor; 213. Third water pressure sensor; 3. Traction mechanism; 301. Traction cable; 302. Baffle; 303. Casing; 304. Flange; 305. Rotating drum; 306. Second rotating shaft; 307. Driving motor. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example 1 Reference Figure 1-10The present invention discloses a device for measuring pipeline pressure, comprising an annular traveling mechanism 1 which moves along the axial direction inside the pipeline. The annular traveling mechanism 1 enables the device to move axially inside the pipeline whose pressure is to be measured, so as to determine the axial position of the leakage point in the pipeline when a pressure change is found.

[0021] The pressure measuring mechanism 2 is used to measure the pressure at different radial angles of the pipeline. The pressure measuring mechanism 2 is located inside the annular traveling mechanism 1. That is, while the annular traveling mechanism 1 drives the pressure measuring mechanism 2 to move axially, the pressure measuring mechanism 2 can also measure the pressure values ​​at different radial positions of the pipeline. Generally speaking, the pressure condition of the fluid in the pipeline is continuous and stable when there is no leakage. For example, in the same pipeline, the liquid pressure at a high position is lower than the liquid pressure at a low position, while the pressure in the horizontal direction is the same.

[0022] For a pipeline laid in a horizontal direction, when the annular walking mechanism 1 moves to the leakage point in the pipeline, the pressure measuring mechanism 2 detects the pressure change and can confirm the specific axial position of the leakage point in the pipeline. The pressure measuring mechanism 2 can also specifically detect the pressure values ​​of each position in the radial direction of the pipeline. The pressure at the leakage point is the pressure at the axial position of the pipeline, which gradually decreases toward the leakage point. The specific direction of the leakage point in the circumferential direction of the pipeline is judged in turn. For pipelines laid underground or embedded in buildings, excavation can be accurately carried out from the detected leakage point. First, the excavation efficiency is improved and the time for finding the leakage point is reduced. Second, unnecessary damage to the ground and buildings is avoided, reducing economic losses.

[0023] The device also includes a traction mechanism 3 for driving the annular traveling mechanism 1 to move. The traction mechanism 3 pulls the device from the outside to move the annular traveling mechanism 1 along the axial direction of the pipeline, thereby driving the device to measure the water pressure changes at different positions along the axial direction of the pipeline.

[0024] The two traction mechanisms 3 are respectively located at the two axial ends of the pipeline. The two traction mechanisms 3 pull the device to move back and forth in the pipeline from the two axial ends of the pipeline, and repeatedly measure the pressure conditions in the pipeline to ensure the timeliness of the measurement data.

[0025] The pressure measuring mechanism 2 includes a blade 202 and a first water pressure sensor 203. The blade 202 is radially installed inside the annular traveling mechanism 1. The blade 202 is in a flat, long plate-like structure. A plurality of first water pressure sensors 203 are installed on the blade 202 along the radial direction of the annular traveling mechanism 1. Specifically, the first water pressure sensors 203 are evenly spaced on the blade 202 along the radial direction of the annular traveling mechanism 1, from a position close to the center of the circle to a direction away from the center of the circle, and are used to detect the pressure conditions at various positions on any radial cross-section of the pipeline, so as to determine whether there is a leakage point and at which position the leakage point is (such as at 12 o'clock, 4 o'clock, or 7 o'clock, etc.).

[0026] The pressure measuring mechanism 2 also includes a support arm 201 and a first rotating shaft 206. The support arm 201 is fixedly connected to the inner side of the annular walking mechanism 1. Multiple support arms 201 are radially distributed. The centers of the multiple support arms 201 are fixedly connected together through a rotating shaft seat 205. The blade 202 is rotatably installed on the support arm 201 through the first rotating shaft 206 in the circumferential direction of the annular walking mechanism 1, and the first rotating shaft 206 is rotatably installed in the rotating shaft seat 205, so that the blade 202 is rotatably installed in the annular outer ring 101 along the circumferential direction.

[0027] The traction mechanism 3 is connected to the support arm 201 to pull the device to move.

[0028] One of the installation methods of the blade 202 is to process a second groove 204 corresponding to the blade 202 on the inner side of the annular walking mechanism 1, and a second ball 211 is installed at one end of the blade 202 close to the second groove 204, and the second ball 211 is movably embedded in the end of the blade 202. A part of the second ball 211 is movably embedded in the blade 202, and the other part is located in the second groove 204, so that the blade 202 and the second groove 204 are rollingly connected through the second ball 211, which is used to support the blade 202 more smoothly during rotation.

[0029] The blade 202 is installed by rotating 45 degrees along its radial direction. Figure 5 As shown, two blades 202 are butt-jointed together on the same meridian, and the two are oriented vertically at 90 degrees. In this way, when the device is pulled axially inside the pipeline by the traction mechanism 3, the liquid in the pipeline forms a thrust on the blade 202, so that the blade 202 can rotate around the first rotating shaft 206, so that the distribution of water pressure at different radial positions of the annular walking mechanism 1 can be detected, and the leakage point can be determined based on the water pressure data.

[0030] Furthermore, the number of blades 202 can be increased to further improve the amount of real-time monitoring data of the device, and the detection data at different positions at each time, thereby further improving the timeliness of discovering leakage points.

[0031] A first gyroscope 208 is installed on the first rotating shaft 206, and a second gyroscope 209 is installed on the support arm 201. Specifically, an axial hole 207 is processed along the axial direction at the center position of the first rotating shaft 206, and the axial hole 207 is a through hole. The first gyroscope 208 is installed at the end of the axial hole 207. The first gyroscope 208 is fixedly connected to the first rotating shaft 206 through a first bracket, and the second gyroscope 209 is installed at the end of the rotating shaft seat 205 through a second bracket. The second gyroscope 209 is also located on the axis of the first rotating shaft 206. In this way, the first gyroscope 208 detects the rotation direction and specific angle of the blade 202 during operation, and the second gyroscope 209 detects the rotation direction and specific angle of the annular outer ring 101 during operation. Through subsequent calculation, the actual rotation data of the blade 202 at different axial positions of the pipeline can be obtained, and it can be further confirmed that the first water pressure sensor 203 installed on the corresponding blade 202 detects the water pressure data of that position in the pipeline.

[0032] Furthermore, a second water pressure sensor 212 is installed at the axial position of the axial hole 207, and the axial hole 207 is connected to the outside, ensuring that the second water pressure sensor 212 can detect the water pressure conditions at the axial center at different positions in the axial direction of the pipeline, and compare with the data detected by the first water pressure sensor 203 to improve the accuracy of data comparison.

[0033] The annular walking mechanism 1 includes an annular outer ring 101 installed coaxially with the pipeline, and a first ball 102 installed between the outer wall of the annular outer ring 101 and the inner wall of the pipeline. The first ball 102 is movably embedded in the annular outer ring 101, and the annular outer ring 101 and the inner wall of the pipeline are rollingly connected through the first ball 102.

[0034] When the device is pulled to move by the traction mechanism 3, the first ball 102 is in rolling contact with the annular outer ring 101 and the inner wall of the pipe, so as to reduce the friction resistance of the device when it moves in the pipe.

[0035] A ball groove 103 corresponding to the first ball 102 is processed on the annular outer ring 101. The ball groove 103 is located in a spherical groove 103 whose size corresponds to the size of the first ball 102. The ball groove 103 radially penetrates the annular outer ring 101. The radius of the top opening of the ball groove 103 is smaller than the radius of the first ball 102 and smaller than the radius of the bottom opening, so as to prevent the first ball 102 from falling out of the ball groove 103.

[0036] An annular inner ring 104 is installed inside the annular outer ring 101, and a first groove 106 corresponding to the first ball 102 is processed on the outer wall of the annular inner ring 104. The cross-section of the first groove 106 is semicircular. The annular inner ring 104 supports the first ball 102 outwardly through the first groove 106 and is rotatably installed in the ball groove 103 to prevent the first ball 102 from falling out of the ball groove 103.

[0037] An expansion joint 105 is provided on the annular inner ring 104 along the axial direction of the annular outer ring 101. The diameter of the annular inner ring 104 itself is larger than the inner diameter of the annular outer ring 101. After being compressed, it is inserted into the annular outer ring 101, so it has good elastic deformation performance of stretching outward. First, it can better support the first ball 102, so that the first ball 102 and the inner wall of the pipe maintain a good fit effect, which promotes the stability of the device during movement. Second, during long-term use, after the first ball 102 is worn and its diameter becomes smaller, the annular inner ring 104 automatically stretches and deforms outward to support the first ball 102 to continue to fit with the inner wall of the pipe. Moreover, during operation, when there is a protrusion stuck on the inner wall of the pipe, if the height of the protrusion does not exceed the gap height between the annular outer ring 101 and the inner wall of the pipe, the first ball 102 can smoothly press over the protrusion by squeezing the annular inner ring 104 downward to keep the operation going.

[0038] The traction mechanism 3 includes a traction cable 301, a shell 303, a rotating drum 305, and a driving motor 307. The shell 303 is a cylindrical structure with an open end outside. A flange 304 is welded and fixed to the open end of the shell 303. The shell 303 and the pipeline to be measured are sealed and connected via the flange 304. A second rotating shaft 306 is rotatably arranged inside the shell 303. Both ends of the second rotating shaft 306 are sealed and rotatably connected to the shell 303. One end of the second rotating shaft 306 extends to the outside of the shell 303. The end of the rotating drum 305 extending outside the shell 303 is connected to the working end of the driving motor 307. When the driving motor 307 is installed, it is installed outside the pipeline to be measured.

[0039] The annular walking mechanism 1 or the pressure measuring mechanism 2 is connected to the rotating drum 305 through a traction cable 301. The traction cable here refers to a cable with a traction rope embedded inside. The traction rope and the conductor are wrapped together inside the traction cable. It has good mechanical strength against tensile strength, extrusion strength and tearing strength, and can meet the needs of power transmission and traction at the same time. The first water pressure sensor 203, the second water pressure sensor 212, the first gyroscope 208, and the second gyroscope 209 in this application are powered by the traction cable. Among them, electric slip rings and brushes can be used between the first rotating shaft 206 and the rotating shaft seat 205, and between the second rotating shaft 306 and the external power supply equipment for power and signal rotation connection transmission.

[0040] Among them, corresponding cable holes are opened on the first rotating shaft 306 and the rotating drum 305, one end of the cable hole radially penetrates the first rotating shaft 306 and the rotating drum 305, the middle part of the cable hole extends along the axis of the first rotating shaft 306, and the other end of the cable hole penetrates the side wall of the first rotating shaft 306 along the external radial direction of the first rotating shaft 306 outside the outer shell 303, the rope in the traction cable is fixedly connected to the rotating drum 305, and after the wire passes through the cable hole, it is connected to the external power supply wire by rotation and sliding through the brush and the electric slip ring.

[0041] Example 2 Reference Fig.11 The present invention provides a device for measuring pipeline pressure. The difference between this embodiment and embodiment 1 is that there are multiple blades 202, and the multiple blades 202 are radially distributed. The end of the blade 202 close to the center of the annular walking mechanism 1 is fixedly connected together through the first rotating shaft 206, and the end of the blade 202 away from the first rotating shaft 206 is fixedly connected to the annular walking mechanism 1. If the number of blades 202 is four, it can mainly detect the water pressure conditions at different distances from the axis in the four directions of up, down, left, and right on the radial cross section of the pipeline. If the number of blades 202 is eight, it can detect the water pressure conditions in eight directions. The number can also be sixteen, and so on.

[0042] Furthermore, when the blade 202 is fixedly connected to the annular outer ring 101, the blade 202 is rotated 90 degrees so that the narrow side of the blade 202 is parallel to the axial direction of the annular outer ring 101. In this way, when the device moves axially in the pipeline, the blade 202 can effectively reduce the resistance and reduce the rotation amplitude of the annular walking mechanism 1 in the circumferential direction, thereby reducing the frequency of using the first gyroscope 208. Of course, the first gyroscope 208 can be used to determine the angle when necessary.

[0043] The annular outer ring 101 of the annular walking mechanism 1 can be directly connected to the rotating drum 305 through the traction cable 301; Alternatively, the support arm 201 and the first rotating shaft 206 of the pressure measuring mechanism 2 are directly connected to the rotating drum 305 through the traction cable 301. When connected, the connection point between the device and the traction cable is kept symmetrical about the axis of the annular outer ring 101 to ensure stable pulling of the device.

[0044] Example 3 Reference Fig.12The present invention is a device for measuring pipeline pressure. The difference between this embodiment and embodiment 2 is that it also includes a third water pressure sensor 213. A plurality of third water pressure sensors 213 are evenly installed on the circumferential outer wall of the annular outer ring 101. Originally, a first ball 102 is embedded and installed on the circumferential wall of the annular outer ring 101. A plurality of first balls 102 are distributed along the axial direction of the annular outer ring 101 and are respectively located at the axial ends of the annular outer ring 101. This further improves the stability of the device when the pipeline rolls along the pipeline, and the third water pressure sensor The sensor 213 is installed between the first balls 102 at both ends. After the rotation angle of the annular outer ring 101 is detected by the first water pressure sensor 203 or the second water pressure sensor 212, the water pressure conditions in different directions between the outer wall of the annular outer ring 101 and the gap between the inner wall of the pipe can be detected by the third water pressure sensor 213. Since the third water pressure sensor 213 is closer to the inner wall of the pipe, the data from the first water pressure sensor 203 and the second water pressure sensor 212 can be used to further improve the accuracy of detecting water pressure changes at the leakage point.

[0045] Working principle: When in use, the annular traveling mechanism 1 and the pressure measuring mechanism 2 are installed in the pipeline where the pressure needs to be detected, and then the traction mechanism 3 is installed at both ends of the pipeline where the detection position needs to be made, so that the rotating drum 305 is located on the inner side of the pipeline, and then the traction mechanisms 3 on both sides are started. The two traction mechanisms 3 cyclically and alternately pull the annular traveling mechanism 1, driving the annular traveling mechanism 1 and the pressure measuring mechanism 2 to move back and forth in the pipeline along the axial direction of the pipeline. During the movement, the pressure conditions at various locations in the pipeline are detected by the pressure measuring mechanism 2.

[0046] The first water pressure sensor 203, the second water pressure sensor 212, and the third water pressure sensor 213 can detect water pressure conditions at positions with different central angles and distances from the axis on sections at different positions along the pipeline axis.

[0047] When a leak occurs on a pipe side wall at a certain place, the water pressure at the leak point is lower than the normal pressure at that position. When the device moves to that position, it can accurately detect the change in water pressure at that position. Combined with the traction distance data of the two traction mechanisms 3, the specific position of the leak point in the axial direction of the pipe can be accurately determined. Moreover, based on the angle between the blade 202 where the first water pressure sensor 203 and the second water pressure sensor 212 are located and the axis, the specific orientation of the leak point in the cross-section can be determined (using the clock orientation method). During maintenance, the ground or building surface closest to the leak point can be accurately excavated, thereby reducing construction time and improving construction efficiency.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for measuring pipeline pressure, characterized in that: The invention comprises an annular traveling mechanism (1) that moves along the axial direction inside a pipeline, a pressure measuring mechanism (2) for measuring pressures at different radial angles of the pipeline, the pressure measuring mechanism (2) being located inside the annular traveling mechanism (1), and a traction mechanism (3) for driving the annular traveling mechanism (1) to move, the two traction mechanisms (3) being located at two ends of the axial direction of the pipeline, respectively.

2. A device for measuring pipeline pressure according to claim 1, characterized in that: The pressure measuring mechanism (2) comprises a blade (202) and a first water pressure sensor (203); the blade (202) is radially arranged inside the annular traveling mechanism (1); and a plurality of first water pressure sensors (203) are radially arranged on the blade (202) of the annular traveling mechanism (1).

3. A device for measuring pipeline pressure according to claim 2, characterized in that: It also comprises a support arm (201) and a first rotating shaft (206); the support arm (201) is arranged on the inner side of the annular walking mechanism (1); the blade (202) is rotatably mounted on the support arm (201) via the first rotating shaft (206) in the circumferential direction of the annular walking mechanism (1); and the traction mechanism (3) is connected to the support arm (201).

4. A device for measuring pipeline pressure according to claim 3, characterized in that: A second groove (204) corresponding to the blade (202) is arranged on the inner side of the annular walking mechanism (1); a second ball (211) is arranged at one end of the blade (202) close to the second groove (204); and the blade (202) and the second groove (204) are rollingly connected via the second ball (211).

5. The device for measuring pipeline pressure according to claim 4, characterized in that: A first gyroscope (208) is arranged on the first rotating shaft (206), and a second gyroscope (209) is arranged on the supporting arm (201).

6. The device for measuring pipeline pressure according to claim 1, characterized in that: The annular walking mechanism (1) comprises an annular outer ring (101) arranged coaxially with the pipeline, and a first ball (102) installed between the outer wall of the annular outer ring (101) and the inner wall of the pipeline, and the annular outer ring (101) and the inner wall of the pipeline are rollingly connected via the first ball (102).

7. A device for measuring pipeline pressure according to claim 6, characterized in that: The annular outer ring (101) is provided with a ball groove (103) corresponding to the first ball (102); an annular inner ring (104) is provided inside the annular outer ring (101); a first groove (106) corresponding to the first ball (102) is provided on the outer wall of the annular inner ring (104); the annular inner ring (104) supports the first ball (102) outwardly through the first groove (106) and is rotatably installed in the ball groove (103).

8. The device for measuring pipeline pressure according to claim 7, characterized in that: An expansion joint (105) is provided on the annular inner ring (104) along the axial direction of the annular outer ring (101).

9. The device for measuring pipeline pressure according to claim 1, characterized in that: The traction mechanism (3) comprises a traction cable (301), a housing (303), a rotating drum (305), and a driving motor (307); the housing (303) is sealedly connected to the pipeline to be measured; the rotating drum (305) is rotatably mounted inside the housing (303); the rotating drum (305) is connected to a working end of the driving motor (307); and the annular walking mechanism (1) or the pressure measuring mechanism (2) is connected to the rotating drum (305) via the traction cable (301).

10. The device for measuring pipeline pressure according to claim 2, characterized in that: There are a plurality of blades (202), which are distributed radially. The blades (202) are fixedly connected to the annular walking mechanism (1), and the annular walking mechanism (1) or the pressure measuring mechanism (2) is connected to the rotating drum (305) via a traction cable (301).

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