Water pipeline pressure detection device

Abstract

The present application relates to pipeline detection technical field, specifically, it is a kind of water conservancy pipeline pressure detection device.It includes the fixed frame of fixed connection in the top of detection platform, the fixed frame is used to be fixed along the axial detection water pipe, one end of the fixed frame is fixedly connected with installation bolt;The installation bolt is rotatably connected with U-shaped limiting frame on the side close to water pipe, the U-shaped limiting frame includes two axial rods and a radial rod, the side close to each other of two axial rods is equipped with extrusion wheel for detecting water pipe wall;When the transfer block is pushed by push block and slides along the axial water pipe to be measured, multiple transfer blocks extrude pressure bearing surface to make pressure bearing seat slide along the radial direction of water pipe, pressure bearing seat drives marker pen to slide to the direction close to another marker pen by telescopic rod, and two extrusion wheels themselves slide to the direction away from each other, so that marker pen coincides with water pipe wall due to relative motion with extrusion wheel, and leaves mark at pipe wall thickening.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and specifically, to a water conservancy pipeline pressure detection device. Background Art

[0002] In the construction of water conservancy projects, metal structures and pipelines are often built underwater to meet the requirements of water conservancy project construction. The pipelines underground are subject to various reverse external pressures and internal water pressure internal tensions, causing damage to the use of the pipelines. Therefore, during the pipeline production process, it is necessary to conduct strength detection on the pipelines so that the pipelines can meet the subsequent use of water conservancy projects.

[0003] Due to the need to connect with structures such as flanges, after the working water pressure increases, water leakage and bursting are likely to occur. Therefore, the end interfaces of the pipelines need to be detected more than the middle part. In the prior art, usually, an extrusion wheel is used to apply an extrusion force to the water pipe wall, and then the data fed back by the sensor is used to simulate the detection of whether the end of the water pipe can maintain sealing under a certain water pressure. However, during the water pipe production process, due to process errors, such as uneven cooling resulting in uneven wall thickness, the following situation will occur: when the same extrusion force is applied to the pipe wall by the pressing wheel, due to the large rigidity and low deformation of the thick wall position of the pipe wall, it is easy to have a situation where the extrusion wheel does not fit well with the pipe wall. If there are tiny cracks in the pipe wall or sealing defects at the interface at this time, they will be detected and judged as qualified because they cannot be opened by the extrusion wheel, and cracks and leaks will occur after the water pipe is filled with water later.

[0004] In view of this, we propose a water conservancy pipeline pressure detection device to improve the above deficiencies. <U + Summary of the Invention

[0005] The present invention provides a water conservancy pipeline pressure detection device, which solves the problem that the existing method of using an extrusion wheel with a fixed extrusion force to detect the end pressure seal of a water conservancy pipeline cannot adapt to the uneven wall thickness caused by uneven production cooling, resulting in the easy omission of tiny cracks at the thick wall and sealing defects at the interface, and causing cracks and leaks after the pipeline is filled with water later.

[0006] To achieve the above object, the water conservancy pipeline pressure detection device includes a fixed frame fixedly connected to the top of the detection table. The fixed frame is used to axially fix the water pipe to be detected, and one end of the fixed frame is fixedly connected with a mounting bolt;

[0007] The mounting bolt is rotatably connected with a U-shaped limiting frame on the side close to the water pipe. The U-shaped limiting frame includes two axial rods and a radial rod. On the side where the two axial rods are close to each other, extrusion wheels for detecting the water pipe wall are provided. In the middle of the side where the two extrusion wheels are away from each other, an installation groove is opened, and a marking pen is inserted through the installation groove on the side close to the other extrusion wheel;

[0008] As the wall thickness of the water pipe between the two extrusion rollers increases, two markers move closer together to mark the thickened part of the water pipe wall. The greater the increase in the water pipe wall thickness, the greater the feed amount when the two markers move closer together.

[0009] In the above technical solution, after the water pipe to be tested is fixedly installed on the top of the fixing frame, the end position of the water pipe wall is inserted between the two squeezing rollers, and the two squeezing rollers are started to rotate along the water pipe wall and around the water pipe axis.

[0010] When the wall thickness of the water pipe to be tested is different, under the squeezing action of the thickened water pipe wall, the two squeezing rollers move away from each other radially along the water pipe to ensure that the two squeezing rollers remain in close contact with the water pipe wall during the testing process. During the production process of water pipes, the pipe wall may inevitably have uneven circumferential wall thickness due to uneven cooling, etc. In this application, if the two squeezing rollers slide along the water pipe wall and encounter a sudden thickening of the pipe wall, that is, when the pipe wall bulges, the two squeezing rollers move away from each other, but the relative position of the two markers remains unchanged. Therefore, the markers extend from inside the squeezing rollers and contact the water pipe wall. The greater the increase in water pipe wall thickness, the greater the extension of the markers relative to the squeezing rollers, and the higher the degree of overlap between the markers and the water pipe wall. When the squeezing rollers rotate against the water pipe wall, the mark left by the markers on the water pipe wall becomes thicker.

[0011] Based on this, one of the axial rods is fixedly connected to an extension plate on the side away from the other axial rod. The extension plate is rotatably connected to a mounting bolt, and a drive motor for driving the extension plate is provided on the side of the mounting bolt away from the extension plate.

[0012] The drive motor includes a body and an output shaft. The body of the drive motor is fixedly connected to the mounting bolt, and the output shaft of the drive motor is coaxially connected to the extension plate and the water pipe to be tested.

[0013] With this design, after the two extrusion rollers are locked onto the inner and outer sides of the water pipe wall, the power to the drive motor is turned on. The output shaft of the drive motor drives the extension plate to rotate, and the extension plate then drives a radial rod and two axial rods fixed to it to rotate. Thus, the two extrusion rollers apply pressure to the water pipe wall that is in contact with them. When the extrusion rollers rotate with the extension plate, pressure is detected on the entire circumference of the end of the water pipe.

[0014] In another technical solution, each of the extrusion rollers is fixedly connected to a mounting base on both sides that are far apart from each other, and a sliding rod is fixedly connected to each of the two axial rods on the side that is close to each other, and the sliding rod is slidably connected to the mounting base.

[0015] Furthermore, a push plate is fixedly connected to the end of the slide rod away from the axial rod to which it is connected. A first sliding groove is formed inside the mounting base along the direction parallel to the slide rod. The push plate is slidably connected in the first sliding groove. A guide rod is fixedly connected to the end of the push plate away from the slide rod. A first spring is sleeved around the guide rod. The first spring is used to provide the squeezing force for the two squeezing wheels to clamp the water pipe wall.

[0016] Furthermore, a transfer groove is provided between the first chute and the installation groove to connect the two. The transfer groove is parallel to the axis of the water pipe to be tested. A transfer block is slidably connected inside the transfer groove. A second chute is provided on the side of the installation groove near the other installation groove. A push block is fixedly connected to the end of the guide rod away from the push plate.

[0017] Furthermore, a pressure-bearing seat is slidably connected inside the second chute along the radial direction of the water pipe to be tested. When the push block slides radially along the water pipe, the transfer block slides axially along the water pipe, which is used to make the pressure-bearing seat slide radially along the water pipe.

[0018] In this technical solution, when the extrusion roller sliding along the water pipe wall encounters a section where the wall thickness increases, the mounting base slides along the slide rod and also slides towards the side of the shaft connected to the slide rod. See the attached document for further details. Figure 4 As the distance between the push plate and the inner top wall of the first slide groove decreases, the first spring is compressed and stores elastic potential energy. The force of the first spring driving the mounting base to reset along the slide rod is the squeezing force of the squeezing wheel on the wall of the water pipe to be tested.

[0019] The push block and the transfer block slide together on the inclined surface. When the push block slides radially along the water pipe to be tested in the first groove, the transfer block converts the radial driving force of the push block into the driving force of the transfer block along the axial direction of the water pipe. This drives the pressure seat to slide radially along the water pipe to be tested, and finally causes the extrusion wheel to extend out of the extrusion wheel due to relative sliding with the marker pen, leaving a mark on the water pipe wall.

[0020] In addition, a number of second springs are fixedly connected to the side of the pressure bearing seat away from the mounting groove. A pair of pressure bearing surfaces are provided on the side of the pressure bearing seat away from the second springs. The pair of pressure bearing surfaces includes two. The end of the transfer block away from the push block is slidably attached to the pressure bearing surface through the inclined surface.

[0021] Based on the above, a telescopic rod is provided between the pressure seat and the marker pen. One end of the telescopic rod is fixedly connected to the pressure seat, and a replacement shell is fixedly connected to the end of the telescopic rod away from the pressure seat. The replacement shell is threadedly connected to the marker pen.

[0022] As can be seen from the above scheme, when the transfer block is pushed by the push block and slides along the axial direction of the water pipe to be tested, multiple transfer blocks together squeeze the pressure bearing surface, causing the pressure bearing seat to slide along the radial direction of the water pipe. The pressure bearing seat drives the marker pen to slide closer to another marker pen through the telescopic rod, while the two squeezing wheels themselves slide away from each other. As a result, the marker pen coincides with the water pipe wall due to the relative movement with the squeezing wheels, and leaves a mark at the thickened part of the pipe wall.

[0023] Based on the above description, the beneficial effects of the present invention compared with the prior art are as follows:

[0024] When the transfer block is pushed by the push block and slides along the axial direction of the water pipe to be tested, multiple transfer blocks together squeeze the pressure bearing surface, causing the pressure bearing seat to slide along the radial direction of the water pipe. The pressure bearing seat drives the marker pen to slide closer to another marker pen through the telescopic rod, while the two squeezing wheels themselves slide away from each other. As a result, the marker pen coincides with the water pipe wall due to the relative movement with the squeezing wheels, and leaves a mark at the thickened part of the pipe wall.

[0025] In addition, the greater the relative distance between the marker and the extrusion wheel, the higher the degree of overlap between the marker and the pipe wall. When the degree of overlap between the marker and the pipe wall is low, the marker contacts the pipe wall through the tip, thus leaving a finer mark on the pipe wall. When the degree of overlap between the marker and the pipe wall is high, the marker contacts the pipe wall through the base, thus leaving a coarser mark on the pipe wall, thereby distinguishing the magnitude of the increase in pipe wall thickness. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a perspective view of the overall structure of the present invention;

[0028] Figure 2 This is a partial side view schematic diagram of the present invention;

[0029] Figure 3 This is a schematic diagram illustrating the structural principle of the extrusion wheel rotation detection of the water pipe wall in this invention.

[0030] Figure 4 This is one of the side view schematic diagrams illustrating the principle of the extrusion wheel detecting water pipes with different wall thicknesses in this invention;

[0031] Figure 5 This is the second side view schematic diagram of the extrusion wheel for detecting water pipes with different wall thicknesses in this invention;

[0032] Figure 6 This is a three-dimensional schematic diagram illustrating the principle of the extrusion wheel encountering a protrusion in the pipe wall in this invention.

[0033] Figure 7 This is a side view schematic diagram illustrating the principle of the extrusion wheel encountering a protrusion in the pipe wall in this invention;

[0034] Figure 8 This is a side view of the principle of marking the protrusions on the pipe wall with a marker pen in this invention.

[0035] The meanings of the labels in the diagram are as follows:

[0036] 100. Testing table; 101. Fixture; 110. Mounting bolt;

[0037] 200. U-shaped limiting frame; 201. Extension plate; 202. Drive motor; 210. Extrusion wheel; 220. Mounting base; 230. Slide rod; 231. First slide groove; 232. Push plate; 233. Guide rod; 234. Push block; 235. First spring; 240. Mounting groove; 241. Second slide groove; 242. Transfer groove; 250. Pressure bearing seat; 251. Transfer block; 252. Pressure bearing surface; 260. Second spring;

[0038] 300. Telescopic pole; 310. Replacement casing; 320. Marker pen. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] Due to the need to connect with structures such as flanges, after the working water pressure increases, water leakage and burst openings are likely to occur. Therefore, the end interfaces of the pipeline need to be detected more than the middle part. In the prior art, usually, an extrusion wheel is used to apply an extrusion force to the water pipe wall, and then the data fed back by the sensor is used to simulate the detection of whether the end of the water pipe can maintain a seal under a certain water pressure. However, during the production process of the water pipe, due to process errors, such as uneven cooling resulting in different wall thicknesses, the following situation will occur: when the same extrusion force is applied to the pipe wall by the pressing wheel, due to the large rigidity and low deformation of the thicker part of the pipe wall, it is easy to have a situation where the extrusion wheel does not fit well with the pipe wall. If there are tiny cracks in the pipe wall or sealing defects at the interface at this time, it will be detected and judged as qualified because it cannot be opened by the extrusion wheel, and cracks and leaks will occur after the water pipe is filled with water later.

[0043] Please refer to Figure 1 and Figure 2 , to solve the above problems existing in the prior art, the purpose of the present invention is to provide a water pipeline pressure detection device. The pressure detection device includes a fixed frame 101 fixedly connected to the top of the detection table 100. The fixed frame 101 is used to axially fix the water pipe to be detected, and one end of the fixed frame 101 is fixedly connected with a mounting bolt 110;

[0044] A U-shaped limiting frame 200 is rotatably connected to the side of the mounting bolt 110 close to the water pipe. The U-shaped limiting frame 200 includes two axial rods and a radial rod. On the side where the two axial rods are close to each other, extrusion wheels 2?? for detecting the water pipe wall are provided. In the middle of the sides where the two extrusion wheels 210 are away from each other, a mounting groove 240 is opened. A marking pen 320 is inserted through the mounting groove 240 on the side close to the other extrusion wheel 210;

[0045] When the wall thickness of the water pipe between the two extrusion wheels 210 increases, the two marking pens 320 approach each other, used to mark the thickened part of the water pipe wall, and the greater the increase in the wall thickness of the water pipe, the greater the feed amount of the two marking pens 320 approaching each other.

[0046] During detection, first, after the water pipe to be detected is fixedly installed on the top of the fixed frame 101, the end position of the water pipe wall is clamped between the two extrusion wheels 210, and the two extrusion wheels 210 are started to rotate along the water pipe wall around the axis of the water pipe.

[0047] When the wall thickness of the water pipe to be tested is different, under the squeezing action of the thickened water pipe wall, the two squeezing rollers 210 move away from each other radially along the water pipe to ensure that the two squeezing rollers 210 are always in close contact with the water pipe wall during the testing process. During the production process of water pipes, the pipe wall may inevitably have different circumferential wall thicknesses due to uneven cooling, etc. In this application, if the two squeezing rollers 210 slide along the water pipe wall and encounter a suddenly thickened pipe wall, that is, when the pipe wall bulges, the two squeezing rollers 210 move away from each other, but the relative position of the two markers 320 remains unchanged. Therefore, the markers 320 extend from the squeezing rollers 210 and contact the water pipe wall. The greater the increase in the water pipe wall thickness, the greater the extension of the markers 320 relative to the squeezing rollers 210, and the higher the degree of overlap between the markers 320 and the water pipe wall. When the squeezing rollers 210 rotate along the water pipe wall, the mark left by the markers 320 on the water pipe wall is thicker.

[0048] Next, please refer to Figure 3 The method of driving the rotation of the water pipe axis of the extrusion wheel 210 is disclosed. One of the axial rods is fixedly connected to an extension plate 201 on the side away from the other axial rod. The extension plate 201 is rotatably connected to the mounting bolt 110. The mounting bolt 110 is provided with a drive motor 202 for driving the extension plate 201 on the side away from the extension plate 201.

[0049] The drive motor 202 includes a body and an output shaft. The body of the drive motor 202 is fixedly connected to the mounting bolt 110. The output shaft of the drive motor 202 is coaxially connected to the extension plate 201 and the water pipe to be tested.

[0050] It needs to be disclosed that after the two extrusion rollers 210 are locked onto the inner and outer sides of the water pipe wall, the power supply of the drive motor 202 is turned on. The output shaft of the drive motor 202 drives the extension plate 201 to rotate. The extension plate 201 then drives a radial rod and two axial rods fixedly connected to it to rotate, so that the two extrusion rollers 210 apply pressure to the water pipe wall that is in contact with them. When the extrusion rollers 210 rotate with the extension plate 201, pressure is detected on the entire circumference of the end of the water pipe.

[0051] In particular, the extrusion roller 210, as a pressure detection structure, adopts mature existing technology and contains a pressure sensor unit, which is not shown in the accompanying drawings and will not be described in detail here.

[0052] The positional connection relationship between the axial rod and the extrusion wheel 210 is disclosed below, such as... Figure 4 and Figure 5 As shown, each extrusion wheel 210 is fixedly connected to a mounting base 220 on both sides that are far apart from each other, and a slide rod 230 is fixedly connected to each of the two axial rods on the side that is close to each other. The slide rod 230 is slidably connected to the mounting base 220.

[0053] Furthermore, a push plate 232 is fixedly connected to the end of the slide rod 230 away from the axial rod to which it is connected. A first groove 231 is provided inside the mounting base 220 along the direction parallel to the slide rod 230. The push plate 232 is slidably connected in the first groove 231. A guide rod 233 is fixedly connected to the end of the push plate 232 away from the slide rod 230. A first spring 235 is sleeved around the guide rod 233. The first spring 235 is used to provide the squeezing force for the two squeezing rollers 210 to clamp the water pipe wall.

[0054] Furthermore, a transfer groove 242 is provided between the first slide groove 231 and the mounting groove 240 to connect the two. The transfer groove 242 is parallel to the axis of the water pipe to be tested. A transfer block 251 is slidably connected inside the transfer groove 242. A second slide groove 241 is provided on the side of the mounting groove 240 near the other mounting groove 240. A push block 234 is fixedly connected to the end of the guide rod 233 away from the push plate 232.

[0055] Furthermore, a pressure-bearing seat 250 is slidably connected inside the second chute 241 along the radial direction of the water pipe to be tested. When the push block 234 slides along the radial direction of the water pipe, the transfer block 251 slides along the axial direction of the water pipe to make the pressure-bearing seat 250 slide along the radial direction of the water pipe.

[0056] In other words, when the extrusion roller 210, which slides along the water pipe wall, encounters a section where the wall thickness increases, the mounting base 220 slides along the slide rod 230 and slides towards the side of the shaft connected to the slide rod 230. See also [the relevant documentation / reference needed]. Figure 4 As the distance between the push plate 232 and the inner top wall of the first slide groove 231 decreases, the first spring 235 is compressed and stores elastic potential energy. The force of the first spring 235 driving the mounting base 220 to reset along the slide rod 230 is the squeezing force of the squeezing wheel 210 on the wall of the water pipe to be tested.

[0057] Combined with the appendix Figure 6 It can be seen that the push block 234 and the transfer block 251 are slidably attached to each other through the inclined surface. When the push block 234 slides radially along the water pipe to be tested in the first groove 231, the transfer block 251 converts the radial driving force of the push block 234 into the driving force of the transfer block 251 along the axial direction of the water pipe, thereby driving the pressure seat 250 to slide radially along the water pipe to be tested, and finally causing the extrusion wheel 210 to slide relative to the marker pen 320, and protrude from the inside of the extrusion wheel 210, leaving a mark on the water pipe wall.

[0058] exist Figure 6 and Figure 7 In the middle, a number of second springs 260 are fixedly connected to the side of the pressure seat 250 away from the mounting groove 240. A pair of pressure surfaces 252 are provided on the side of the pressure seat 250 away from the second springs 260. The pair of pressure surfaces 252 includes two. The end of the transfer block 251 away from the push block 234 slides and fits against the pressure surface 252 through the inclined surface.

[0059] Based on the above, a telescopic rod 300 is provided between the pressure seat 250 and the marker 320. One end of the telescopic rod 300 is fixedly connected to the pressure seat 250, and the other end of the telescopic rod 300 away from the pressure seat 250 is fixedly connected to a replacement shell 310. The replacement shell 310 is threadedly connected to the marker 320.

[0060] It should be noted that when the transfer block 251 is pushed by the push block 234 and slides along the axial direction of the water pipe to be tested, multiple transfer blocks 251 together squeeze the pressure bearing surface 252, causing the pressure bearing seat 250 to slide radially along the water pipe. The pressure bearing seat 250 drives the marker pen 320 to slide closer to another marker pen 320 through the telescopic rod 300, while the two squeezing wheels 210 themselves slide away from each other. As a result, the marker pen 320 coincides with the water pipe wall due to relative movement with the squeezing wheel 210, and leaves a mark at the thickened part of the pipe wall.

[0061] Based on the above explanation, the following is combined with Figure 8 To explain the improvements of marker 320, marker 320 is made of a flexible material, and the radius of marker 320 gradually decreases along the direction from near to far from replacement housing 310.

[0062] The greater the relative distance between the marker 320 and the extrusion wheel 210, the higher the overlap between the marker 320 and the water pipe wall. When the overlap between the marker 320 and the water pipe wall is low, it contacts the pipe wall through the tip, thus leaving a finer mark on the water pipe wall; when the overlap between the marker 320 and the water pipe wall is high, the marker 320 contacts the water pipe wall through the base, thus leaving a coarser mark on the water pipe wall, thereby distinguishing the magnitude of the increase in water pipe wall thickness.

[0063] The working principle of this pressure detection device will be explained in detail below:

[0064] The water pipe to be tested is fixed to the mounting bracket 101 on the top of the testing platform 100. The end of the water pipe is inserted between the two extrusion rollers 210 on the U-shaped limiting bracket 200. The drive motor 202 drives the extension plate 201, the U-shaped limiting bracket 200, and the extrusion rollers 210 to rotate around the axis of the water pipe. The slide rod 230 slides with the mounting base 220. The first spring 235 provides the extrusion rollers 210 with the extrusion force to clamp the water pipe wall. When the pipe wall thickens, the extrusion rollers 210 move away from each other radially. The mounting base 220 slides and compresses the first spring 235. Spring 235 and push block 234 move together and push transfer block 251 axially through inclined plane. Transfer block 251 then drives pressure seat 250 to slide radially through pressure surface 252. Pressure seat 250 drives marker pen 320 to extend relative to extrusion wheel 210 and contact water pipe wall through telescopic rod 300 and replacement shell 310. Marker pen 320 leaves marks of different thicknesses on pipe wall according to different pipe wall thicknesses. At the same time, pressure sensor unit built into extrusion wheel 210 completes water pipe end pressure detection with circumferential rotation.

[0065] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water pipeline pressure testing device, comprising a fixing frame (101) fixedly connected to the top of a testing platform (100), the fixing frame (101) being used to fix the water pipe to be tested along the axial direction, and a mounting bolt (110) fixedly connected to one end of the fixing frame (101), characterized in that: The mounting bolt (110) is rotatably connected to a U-shaped limiting bracket (200) on the side near the water pipe. The U-shaped limiting bracket (200) includes two axial rods and one radial rod. Each of the two axial rods is provided with a squeezing wheel (210) for detecting the water pipe wall on the side where they are close to each other. An installation groove (240) is provided in the middle of the side where the two squeezing wheels (210) are far apart. A marker pen (320) is inserted through the side of the installation groove (240) near the other squeezing wheel (210). When the wall thickness of the water pipe between the two extrusion rollers (210) increases, the two markers (320) move closer to each other to mark the thickened part of the water pipe wall. The greater the increase in the wall thickness of the water pipe, the greater the feed amount of the two markers (320) moving closer to each other.

2. The water pipeline pressure detection device according to claim 1, characterized in that: One of the axial rods is fixedly connected to an extension plate (201) on the side away from the other axial rod. The extension plate (201) is rotatably connected to a mounting bolt (110). The mounting bolt (110) is provided with a drive motor (202) for driving the extension plate (201) on the side away from the extension plate (201).

3. The hydraulic pipeline pressure detection device according to claim 2, characterized in that: The drive motor (202) includes a body and an output shaft. The body of the drive motor (202) is fixedly connected to the mounting bolt (110). The output shaft of the drive motor (202) is coaxially connected to the extension plate (201) and the water pipe to be tested.

4. The water pipeline pressure detection device according to claim 1, characterized in that: Each of the extrusion rollers (210) is fixedly connected to a mounting base (220) on both sides that are far apart from each other, and a slide rod (230) is fixedly connected to each of the two axial rods on the side that is close to each other. The slide rod (230) is slidably connected to the mounting base (220).

5. The hydraulic pipeline pressure detection device according to claim 4, characterized in that: The slide rod (230) has a push plate (232) fixedly connected to the end away from the axial rod to which it is connected. The mounting base (220) has a first groove (231) inside in a direction parallel to the slide rod (230). The push plate (232) is slidably connected in the first groove (231). The push plate (232) has a guide rod (233) fixedly connected to the end away from the slide rod (230). The guide rod (233) is surrounded by a first spring (235). The first spring (235) is used to provide the squeezing force of the two squeezing wheels (210) to clamp the water pipe wall.

6. The hydraulic pipeline pressure detection device according to claim 5, characterized in that: A transfer groove (242) for connecting the first slide groove (231) and the mounting groove (240) is provided. The transfer groove (242) is parallel to the axis of the water pipe to be tested. A transfer block (251) is slidably connected inside the transfer groove (242). A second slide groove (241) is provided on the side of the mounting groove (240) near the other mounting groove (240). A push block (234) is fixedly connected to the end of the guide rod (233) away from the push plate (232).

7. The hydraulic pipeline pressure detection device according to claim 6, characterized in that: The second chute (241) has a pressure seat (250) that slides radially along the water pipe to be tested. When the push block (234) slides radially along the water pipe, the transfer block (251) slides axially along the water pipe to make the pressure seat (250) slide radially along the water pipe.

8. The hydraulic pipeline pressure detection device according to claim 7, characterized in that: A number of second springs (260) are fixedly connected to the side of the pressure seat (250) away from the mounting groove (240). A pair of pressure-bearing surfaces (252) are provided on the side of the pressure seat (250) away from the second springs (260). The pair of pressure-bearing surfaces (252) includes two. The end of the transfer block (251) away from the push block (234) slides and fits against the pressure-bearing surface (252) through the inclined surface.

9. The hydraulic pipeline pressure detection device according to claim 7, characterized in that: A telescopic rod (300) is provided between the pressure seat (250) and the marker (320). One end of the telescopic rod (300) is fixedly connected to the pressure seat (250), and a replacement shell (310) is fixedly connected to the end of the telescopic rod (300) away from the pressure seat (250). The replacement shell (310) is threadedly connected to the marker (320).

10. The hydraulic pipeline pressure detection device according to claim 9, characterized in that: The marker (320) is made of a flexible material, and the radius of the marker (320) gradually decreases from the direction of approaching the replacement shell (310) to moving away from the replacement shell (310).

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