A sewer pipe pressure resistance detection device and method

Abstract

The application relates to the technical field of pipeline detection, in particular to a water supply and drainage pipeline compression resistance detection device and method. The water supply and drainage pipeline compression resistance detection device comprises a machine body and two vertically symmetrical and relatively close or far extrusion mechanisms, each of which comprises a mounting block, a pressing plate, an annular belt, a rotating roller, a tension part and a buffer assembly. The mounting block rotates around a horizontal preset axis parallel to the pipeline axis, the annular belt slides around the circumferential surface of the pressing plate and is in contact with the pipeline, the rotating roller slides in the direction perpendicular to the preset axis to drive the annular belt to move, the tension part adjusts the parallelism of the two pressing plates and makes the annular belt tight, and the buffer assembly avoids frequent parallelism adjustment. Through cooperation of the annular belt and the rotating roller, the pipeline can be driven to rotate around the self axis to correct the placing posture, ensure that the pipeline end surface is parallel to the pressing plate and eliminate the placing error; the sliding of the annular belt changes the contact position, and the uneven pressure transmission caused by impurities is avoided.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection technology, and in particular to a pressure testing device and method for water supply and drainage pipelines. Background Technology

[0002] In the field of water supply and drainage engineering, PVC pipes have become the core pipe material for urban and rural water supply and drainage systems due to their advantages such as lightweight, corrosion resistance, and controllable cost. Their compressive strength directly determines the operational safety and service life of the pipeline after installation. Therefore, compressive strength testing before the pipeline leaves the factory is a key step in ensuring project quality. The current industry generally uses a pressure machine with upper and lower pressure plates to test the PVC pipes by applying pressure to determine whether they meet the compressive strength performance standards.

[0003] However, existing pressure plate testing equipment requires manual placement of the PVC pipe between the upper and lower pressure plates, necessitating that the pipe be placed horizontally with its end face parallel to the pressure plate end face. Manual operation is susceptible to subjective factors, making it difficult to accurately control the pipe position, leading to pipe eccentricity or end face tilting. This results in unbalanced forces during pressure loading, causing deviations in the test data and affecting the assessment of pipe quality.

[0004] Meanwhile, structural wear during installation or long-term use of the testing equipment can cause the upper and lower pressure plates to become out of parallel. During testing, non-parallel pressure plates will apply an eccentric load to the PVC pipe, causing uneven stress on the pipe. This not only distorts the testing results but may also lead to abnormal pipe damage, making it impossible to accurately assess the pipe's compressive strength. Summary of the Invention

[0005] Therefore, it is necessary to provide a pressure testing device and method for water supply and drainage pipelines to address the inconvenience of using current testing equipment.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A pressure testing device for water supply and drainage pipelines includes a body and two extrusion mechanisms. Each extrusion mechanism includes a mounting block, a pressure plate, an annular belt, an adjustment component, and a buffer component. The mounting block is rotatably mounted on the body around a preset axis and is located on one side of the pipeline in the vertical direction. The preset axis is horizontally set and parallel to the pipeline axis. The extension direction of the preset axis is defined as a first direction. The pressure plate is mounted on the mounting block. The annular belt is wrapped around the circumference of the pressure plate and can slide relative to the pressure plate. The annular belt contacts the pipeline. The adjustment component includes a rotating roller and a tensioning part. The rotating roller is set inside the annular belt and slides on the mounting block along a second direction. The second direction is perpendicular to the first direction. The plane containing the first and second directions is parallel to the pressure plate. The rotating roller contacts the annular belt and can drive the annular belt to slide. The tensioning part is used to keep the annular belt taut and can adjust the parallelism between the two pressure plates. The two extrusion mechanisms are arranged vertically and symmetrically rotated 180° about the pipeline axis. The mounting blocks in the two extrusion mechanisms can move closer or further apart from each other in the vertical direction. The buffer component is used to limit the tensioning part from frequently adjusting the two pressure plates within the parallelism error range.

[0008] Preferably, the tension section includes a horizontal plate, a telescopic rod, and a first elastic element. The horizontal plate is disposed on the mounting block and arranged sequentially with the pressure plate and the rotating roller along the second direction. The horizontal plate is located inside the annular belt. The telescopic rod passes through the horizontal plate along a third direction and is slidably connected to the horizontal plate. The third direction is perpendicular to the first direction and the second direction, respectively. The first elastic element ensures that the telescopic rod always has a tendency to elongate.

[0009] Preferably, the telescopic rod includes a first slide rod and a second slide rod. The first slide rod is sleeved on the second slide rod and is slidably connected to the cross plate. The first slide rod is located at the end of the second slide rod away from the mounting block in another extrusion mechanism. The first slide rod and the second slide rod can move closer to or further away from the mounting block in another extrusion mechanism along a third direction. Rotating rods are respectively provided at the two ends of the first slide rod and the second slide rod that are far apart from each other. Each rotating rod extends along a first direction and is rotatably connected to the corresponding first slide rod or second slide rod around its own axis. The first slide rod and the corresponding rotating rod are unidirectionally rotatably connected, which is used to control the unidirectional sliding of the annular belt in contact with the pressure plate when the first slide rod and the second slide rod simultaneously approach the mounting block in another extrusion mechanism. The first elastic element includes a first spring and a second spring. The first spring is sleeved on the first slide rod and connects the first slide rod and the cross plate. The second spring is sleeved on the second slide rod and connects the second slide rod and the cross plate.

[0010] Preferably, the mounting block is provided with a positioning plate, which is slidably disposed on the mounting block along a third direction and located between the horizontal plate and the first spring. The first spring is connected to the horizontal plate through the positioning plate, and the positioning plate is fixedly connected to the mounting block by bolts.

[0011] Preferably, the machine body is provided with a fixed plate and a drive mechanism. There are two fixed plates, which are arranged vertically. One fixed plate is fixedly mounted on the machine body, and the other fixed plate is slidably mounted on the machine body in the vertical direction. Each fixed plate has a mounting shell on its side that is close to each other. The mounting block in each extrusion mechanism is rotatably connected to a mounting shell. The mounting block is connected to the machine body through the mounting shell. The drive mechanism is used to drive the fixed plate that is slidably mounted on the machine body to slide.

[0012] Preferably, there is friction between the mounting block and the mounting shell, and the friction is less than the elastic force of the second spring.

[0013] Preferably, the buffer assembly includes a sliding plate, a rotating shaft, a second elastic element, and a reset element. The sliding plate is slidably mounted on the mounting block in a third direction and can abut against a second sliding rod in another extrusion mechanism in a third direction. The rotating shaft is rotatably mounted on the mounting block, and a gear is sleeved on the rotating shaft. The gear is unidirectionally rotatably connected to the rotating shaft. The sliding plate has teeth, and the sliding plate meshes with the gear through the teeth. When the sliding plate moves away from the mounting block in the other extrusion mechanism, the gear can drive the rotating shaft to rotate. The second elastic element is wound around the rotating shaft and connects the rotating shaft and the mounting block. The second elastic element can store energy when the rotating shaft rotates relative to the mounting block. The reset element is used to reset the sliding plate.

[0014] Preferably, the shaft and the mounting housing are connected in a unidirectional rotation, so that the shaft can rotate relative to the mounting housing when the gear rotates synchronously with the shaft.

[0015] Preferably, each mounting block is provided with a cylinder and a piston rod. The cylinder is mounted on the mounting block, and one end of the piston rod is slidably mounted in the cylinder along a third direction and divides the cylinder into two chambers arranged along a third direction and isolated from each other. The other end of the piston rod extends out of the cylinder and is connected to the slide plate. The chamber away from the piston rod is sealed and filled with liquid. The two chambers filled with liquid in the two cylinders of the two extrusion mechanisms are connected by a hose.

[0016] A method for pressure testing of water supply and drainage pipelines includes the following steps:

[0017] S1. Place the pipe on the pressure plate located below, so that the pipe axis extends along the first direction and the pipe contacts the annular strip on the pressure plate;

[0018] S2. Control the two mounting blocks to move closer to each other until the annular strips on both mounting blocks are in contact with the pipe;

[0019] S3. Control the two rotating rollers to slide synchronously and in opposite directions, and make the two rotating rollers slide back and forth in the second direction;

[0020] S4. Control the two mounting blocks to continue to move closer to each other and squeeze the pipe.

[0021] The beneficial effects of this invention are as follows: Through the coordinated arrangement of the annular belt and the rotating roller, the reciprocating sliding of the rotating roller on the mounting block drives the annular belt to reciprocate on the pressure plate, allowing the pipe located on the annular belt to move with it. Through the coordinated arrangement of the annular belts in the two extrusion mechanisms, the pipe can rotate around its own axis, gradually making the extension direction of its own axis perpendicular to the sliding direction of the annular belt on the pressure plate. This allows the pipe end face to be parallel to the end face of the pressure plate, improving detection accuracy and avoiding errors in detection data caused by placement errors. The annular belt on the pressure plate, with its sliding relative to the pressure plate, changes the contact position between the annular belt and the pipe, preventing impurities on the annular belt from contacting the pipe and causing uneven pressure transmission during pipe testing, thus interfering with the final detection results. The tension section and buffer assembly can adjust the parallelism of the two pressure plates while ensuring the stability of the parallelism state, preventing abnormal damage to the pipe due to uneven force, which could lead to inaccurate detection data and improve detection accuracy and reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a pressure testing device for water supply and drainage pipelines provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the extrusion mechanism of a water supply and drainage pipeline pressure testing device provided in an embodiment of the present invention;

[0024] Figure 3 A left view of the extrusion mechanism of a pressure testing device for water supply and drainage pipelines provided in an embodiment of the present invention;

[0025] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0026] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0027] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0028] Figure 7 This invention provides a state diagram of the annular belt contacting the pipeline in a pressure testing device for water supply and drainage pipelines, as provided in an embodiment of the invention.

[0029] Figure 8 This is a state diagram of a water supply and drainage pipeline pressure resistance testing device provided in an embodiment of the present invention to test the pressure resistance of the pipeline.

[0030] in:

[0031] 100. Body; 101. Main block; 102. Side plate; 103. Pressure plate; 104. Circular belt; 105. Rotary roller; 106. Horizontal plate; 107. First slide rod; 108. Second slide rod; 111. First groove; 112. First slide groove; 113. First guide rod; 114. Second guide rod; 121. First spring; 122. Second spring; 123. Positioning plate; 124. Second slide groove; 125. Fixing plate; 126. Mounting shell; 131. Slide plate; 132. Rotating shaft; 133. Gear; 134. Second groove; 135. Third spring; 136. Cylinder; 137. Piston rod; 138. Fourth spring; 139. First baffle; 140. Second baffle. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] like Figures 1 to 8As shown in the embodiment of the present invention, a pressure testing device for water supply and drainage pipelines includes a body 100 and two extrusion mechanisms. Each extrusion mechanism includes a mounting block, a pressure plate 103, an annular belt 104, an adjustment component, and a buffer component. The mounting block is rotatably mounted on the body 100 around a preset axis and is located on one side of the pipeline in the vertical direction. The preset axis is horizontally set and parallel to the pipeline axis. The extension direction of the preset axis is defined as the first direction. The pressure plate 103 is mounted on the mounting block. The annular belt 104 is wrapped around the circumference of the pressure plate 103 and can slide relative to the pressure plate 103. The annular belt 104 contacts the pipeline, and the width of the annular belt 104 is greater than the length of the pipeline. The pipeline is completely located between the two annular belts 104 in the two extrusion mechanisms. The adjustment assembly includes a rotating roller 105 and a tension unit. The rotating roller 105 is disposed inside the annular belt 104 and slidably disposed on the mounting block along a second direction. The second direction is perpendicular to the first direction. The plane containing the first and second directions is parallel to the pressure plate 103. The rotating roller 105 contacts the annular belt 104 and can drive the annular belt 104 to slide. The tension unit is used to keep the annular belt 104 in a taut state and can adjust the parallelism between the two pressure plates 103. The two extrusion mechanisms are arranged vertically and symmetrically arranged about the pipe axis by rotating 180°. The mounting blocks in the two extrusion mechanisms can move closer or further away from each other in the vertical direction. The buffer assembly is used to limit the tension unit from frequently adjusting the two pressure plates 103 within the parallelism error range.

[0036] The annular belt 104 is flexible but not stretchable, and must also possess sufficient strength; a steel belt can be selected. Through the cooperative arrangement of the annular belt 104 and the rotating roller 105, the reciprocating sliding of the roller 105 on the mounting block drives the annular belt 104 to reciprocate on the pressure plate 103, allowing the pipe on the annular belt 104 to move with it. Through the cooperative arrangement of the annular belts 104 in the two extrusion mechanisms, the pipe can rotate around its own axis, gradually making the extension direction of its own axis perpendicular to the sliding direction of the annular belt 104 on the pressure plate 103. This ensures that the pipe end face is parallel to the end face of the pressure plate 103, improving detection accuracy and avoiding errors in detection data caused by placement errors. The annular belt 104 is positioned on the pressure plate 103; the sliding of the annular belt 104 relative to the pressure plate 103 changes the contact position between the annular belt 104 and the pipe, preventing impurities on the annular belt 104 from contacting the pipe and causing uneven pressure transmission during pipe testing, thus interfering with the final detection results. The tension section and buffer assembly can adjust the parallelism of the two pressure plates 103 while ensuring the stability of the parallelism state of the pressure plates 103, avoiding abnormal damage to the pipeline due to uneven stress, which would lead to inaccurate test data and improve the accuracy and reliability of the test.

[0037] In this embodiment, the tension section includes a horizontal plate 106, a telescopic rod, and a first elastic element. The horizontal plate 106 is disposed on the mounting block and arranged sequentially with the pressure plate 103 and the rotating roller 105 along the second direction. The horizontal plate 106 is located inside the annular belt 104. The telescopic rod passes through the horizontal plate 106 along a third direction and is slidably connected to the horizontal plate 106. The third direction is perpendicular to the first direction and the second direction, respectively. The first elastic element ensures that the telescopic rod always has a tendency to extend.

[0038] Specifically, the mounting block includes a main block 101 and two side plates 102. The main block 101 is rotatably mounted around a preset axis. A first groove 111 is formed on the side of the main block 101 closest to the pipe, and the first groove 111 penetrates the main block 101 along a first direction. The two side plates 102 are located on both sides of the main block 101 in the first direction, and the two side plates 102 are respectively bolted to the main block 101. A pressure plate 103 and a horizontal plate 106 are both set in the first groove 111 and connected to the two side plates 102. A first sliding groove 112 is formed on the two side plates 102. A rotating roller 105 is slidably mounted in the first sliding groove 112 along a second direction. The pressure plate 103, the horizontal plate 106, and the rotating roller 105 are all spaced from the main block 101 in a third direction to facilitate the winding of the annular belt 104. Under the action of the first elastic element, the telescopic rod abuts against the inner wall of the annular belt 104, so that the annular belt 104 is in a taut state. The sliding of the roller 105 in the second direction applies a tension force to the annular belt 104. Since the overall length of the annular belt 104 remains constant, the length of the telescopic rod is shortened, and the first elastic element causes the annular belt 104 to tend to return to its original position. Synchronizing the movement of the rollers 105 in the two extrusion mechanisms allows the portions of the two annular belts 104 in contact with the pipe to slide in opposite directions in the second direction, thereby causing the pipe to rotate. After rotation, the extension direction of the pipe's axis becomes perpendicular to the sliding direction of the annular belt 104, thereby making the end face of the pipe parallel to the end face of the pressure plate 103.

[0039] The two side plates 102 are provided with a first guide rod 113 and a second guide rod 114. The first guide rod 113 and the second guide rod 114 are located between the telescopic rod and the pressure plate 103. The first guide rod 113 and the second guide rod 114 are arranged along a third direction and are located on the outside of the annular belt 104. The first guide rod 113 and the second guide rod 114 are in contact with the annular belt 104 and are used to guide the annular belt 104 to turn and enable the annular belt 104 to be better wound around the pressure plate 103 and the telescopic rod.

[0040] The first guide rod 113 is semi-arc-shaped and is fixedly connected to the two side plates 102. The second guide rod 114 is circular and is rotatably connected to the two side plates 102.

[0041] In this embodiment, the telescopic rod includes a first slide rod 107 and a second slide rod 108. The first slide rod 107 is sleeved on the second slide rod 108 and is slidably connected to the cross plate 106. The first slide rod 107 is located at the end of the second slide rod 108 away from the mounting block in another extrusion mechanism. The first slide rod 107 and the second slide rod 108 can move closer to or further away from the mounting block in another extrusion mechanism along a third direction. Rotating rods are respectively provided at the two ends of the first slide rod 107 and the second slide rod 108 that are far apart from each other. Each rotating rod extends along a first direction and is connected to the corresponding first slide rod around its own axis. A slide bar 107 or a second slide bar 108 is rotatably connected. The first slide bar 107 is rotatably connected to the corresponding rotating rod in one direction. It is used to control the one-way sliding of the annular belt 104 in contact with the pressure plate 103 when the first slide bar 107 and the second slide bar 108 are simultaneously close to the mounting block in another extrusion mechanism. The first elastic element includes a first spring 121 and a second spring 122. The first spring 121 is sleeved on the first slide bar 107 and connects the first slide bar 107 and the cross plate 106. The second spring 122 is sleeved on the second slide bar 108 and connects the second slide bar 108 and the cross plate 106.

[0042] Specifically, rotating rods are provided at the ends of the first slide rod 107 and the second slide rod 108 to reduce the friction between the annular belt 104 and the telescopic rod, facilitating the cyclic sliding of the annular belt 104. One end of the first slide rod 107 with the rotating rod is located within the first groove 111, and one end of the second slide rod 108 with the rotating rod is located on the side of the horizontal plate 106 away from the first groove 111 and can contact the mounting block in another extrusion mechanism via the annular belt 104. The first slide rod 107 has a first ratchet tooth, and the rotating rod on the first slide rod 107 has a first pawl. The first pawl and the first ratchet tooth can engage in the circumferential direction of the rotating rod, such as... Figure 5 As shown, the rotating rod on the first slide rod 107 can rotate counterclockwise on the first slide rod 107.

[0043] The first spring 121 and the second spring 122 are always in a compressed state, and initially, the elastic potential energy of the first spring 121 and the second spring 122 are the same. When the two mounting blocks approach each other and contact the annular belt 104, the second slide rod 108 will be pushed and compress the second spring 122, while the first spring 121 will push the first slide rod 107 to slide away from the horizontal plate 106. The overall length of the telescopic rod remains unchanged, the annular belt 104 remains taut, and the portion of the annular belt 104 on the pressure plate 103 remains stationary. When the two mounting blocks move away from each other, since the elastic potential energy of the second spring 122 is greater than the elastic release energy of the first spring 121, the second slide rod 108 will slide away from the horizontal plate 106 and drive the first slide rod 107 to approach the horizontal plate 106 through the annular belt 104 until the elastic potential energy of the first spring 121 is the same as the elastic release energy of the second spring 122. During the process, the length of the annular band 104 on the side of the two rotating rods away from the pressure plate 103 and its relative position to the rotating rods remain unchanged with the cooperation of the first sliding rod 107 and the corresponding rotating rod. The annular band 104 on the side of the two rotating rods closer to the pressure plate 103 will slide relative to the pressure plate 103, and the part of the annular band 104 that contacts the pipe will move closer to the first guide rod 113. After each pipe is pressed, the annular band 104 on the pressure plate 103 will slide once, so that the part that did not contact the pipe will contact the pipe during the next pipe pressing, avoiding the impact of pipe debris on the test results of the next pipe.

[0044] When the two mounting blocks are brought close together and the second slide bar 108 on them is pushed, the pipe is positioned between the two annular bands 104. When the pipe is compressed, the annular bands 104 located on both sides of the pipe can provide protection and prevent fragments from splashing out after the pipe breaks.

[0045] In this embodiment, a positioning plate 123 is provided on the mounting block. The positioning plate 123 is slidably disposed on the mounting block along the third direction and is located between the horizontal plate 106 and the first spring 121. The first spring 121 is connected to the horizontal plate 106 through the positioning plate 123. The positioning plate 123 is fixedly connected to the mounting block by bolts.

[0046] Specifically, the positioning plate 123 is slidably disposed in the first groove 111 along the third direction, and the first slide rod 107 passes through the positioning plate 123 and is slidably connected to the positioning plate 123. The two sides of the positioning plate 123 in the first direction are slidably connected to the two side plates 102. The side plates 102 are fitted with the second slide groove 124. The bolts on the positioning plate 123 are located on the two sides of the positioning plate 123 arranged along the first direction, and the bolts are slidably disposed in the second slide groove 124. Rotating the bolts on the positioning plate 123 can make the bolts abut against the corresponding side plates 102 in the first direction, thereby restricting the sliding of the positioning plate 123 in the third direction.

[0047] When the positioning plate 123 moves away from the horizontal plate 106, the elastic potential energy of the first spring 121 increases, and correspondingly, the elastic potential energy of the second spring 122 also increases, while the rotating rod at the end of the second slide rod 108 moves closer to the horizontal plate 106. This changes the sliding distance of the annular belt 104 on the pressure plate 103 each time the two mounting blocks separate. This allows for adjustment according to the pipe diameter, preventing excessive sliding and unnecessary wear.

[0048] The distance between the annular band 104 at the end of the second slide bar 108 and the cross plate 106 is less than the diameter of the pipe. When the pipe contacts the two annular bands 104, there is a gap between each annular band 104 and the other mounting block.

[0049] In this embodiment, the machine body 100 is provided with a fixing plate 125 and a driving mechanism. There are two fixing plates 125, arranged vertically, with one fixing plate 125 fixedly mounted on the machine body 100 and the other fixing plate 125 slidably mounted on the machine body 100. Each fixing plate 125 has a mounting shell 126 on its adjacent side. A mounting block in each extrusion mechanism is rotatably connected to a mounting shell 126, and the mounting block is connected to the machine body 100 through the mounting shell 126. The driving mechanism is used to drive the fixing plate 125 slidably mounted on the machine body 100 to slide. The driving mechanism is a common linear drive structure in the prior art.

[0050] In this embodiment, friction is provided between the mounting block and the mounting shell 126, and the friction is less than the elastic force of the second spring 122. The main block 101 has a boss along the side near the side plate 102. The boss is circular, and its axis coincides with a preset axis. The boss is rotatably connected to the mounting shell 126, and the main block 101 rubs against the mounting shell 126 through the boss. The ends of the two second slide rods 108 away from their respective corresponding horizontal plates 106 are at the same distance from the corresponding horizontal plates 106. When one of the second slide rods 108 first encounters resistance, it indicates that the two pressure plates 103 are not strictly parallel. When the two mounting blocks continue to approach until both second slide rods 108 encounter resistance and compress the second spring 122, it indicates that the two pressure plates 103 are parallel.

[0051] In this embodiment, the buffer assembly includes a slide plate 131, a rotating shaft 132, a second elastic element, and a reset element. The slide plate 131 is slidably mounted on the mounting block in a third direction and can abut against the second slide rod 108 in another extrusion mechanism in a third direction. The rotating shaft 132 is rotatably mounted on the mounting block, and a gear 133 is sleeved on the rotating shaft 132. The gear 133 is unidirectionally rotatably connected to the rotating shaft 132. The slide plate 131 has teeth, and the slide plate 131 meshes with the gear 133 through the teeth. When the slide plate 131 moves away from the mounting block in the other extrusion mechanism, the gear 133 can drive the rotating shaft 132 to rotate. The second elastic element is wound around the rotating shaft 132 and connects the rotating shaft 132 and the mounting block. The second elastic element can store energy when the rotating shaft 132 rotates relative to the mounting block. The reset element is used to reset the slide plate 131.

[0052] Specifically, the main block 101 has a second groove 134, which penetrates the main block 101 along a first direction. The slide plate 131 is slidably disposed in the second groove 134 and can slide out of the second groove 134 along a third direction. The main block 101 has a through groove that penetrates the main block 101 along the first direction. The through groove is located on one side of the second groove 134 in a second direction and communicates with the second groove 134. The rotating shaft 132 is rotatably disposed in the through groove, and the axis of the rotating shaft 132 coincides with a preset axis. The rotating shaft 132 has a second ratchet, and the gear 133 has a second pawl. The second ratchet and the second pawl can engage in the circumferential direction of the rotating shaft 132, such as... Figure 6 As shown, when gear 133 rotates clockwise, the second ratchet and the second pawl engage, thereby causing gear 133 and shaft 132 to rotate synchronously.

[0053] When the parallelism between the two pressure plates 103 is within the error range, the two second slide rods 108 will be subjected to resistance successively, causing the pressure plates 103 to rotate relative to each other. To avoid the frequent rotation of the pressure plates 103 affecting the detection data, after the two second slide rods 108 are subjected to resistance successively, the second slide rods 108 will control the rotation of the rotating shaft 132 through the sliding plate 131 that abuts against them, thereby storing energy in the second elastic element. After each energy storage, the reset member will reset the sliding plate 131 to prepare for the next energy storage of the second elastic element. After the second elastic element stores energy to a certain extent, it releases the energy, causing the mounting block to rotate relative to the mounting shell 126, thereby achieving the effect of adjusting the parallelism between the two pressure plates 103 at intervals.

[0054] When the pipe comes into contact with the two annular belts 104, there is a gap between the slide plate 131 and the adjacent annular belt 104.

[0055] In this embodiment, the rotating shaft 132 and the mounting housing 126 are unidirectionally rotatably connected. When the gear 133 rotates synchronously with the rotating shaft 132, the rotating shaft 132 can rotate relative to the mounting housing 126.

[0056] A first baffle 139 is provided on the rotating shaft 132, and the rotating shaft 132 is rotatably connected to the mounting housing 126 through the first baffle 139. A third pawl is provided on the first baffle 139, and a third ratchet is provided on the mounting housing 126. The third pawl and the third ratchet can engage in the circumferential direction of the rotating shaft 132 to achieve unidirectional rotation between the rotating shaft 132 and the mounting housing 126. Figure 7 As shown, the first baffle 139 can rotate clockwise around the axis of the rotating shaft 132 on the mounting housing 126. A second baffle 140 is provided on the boss, and the second elastic element is a third spring 135, with both ends of the third spring 135 connected to the first baffle 139 and the second baffle 140. After the rotating shaft 132 rotates under the drive of the gear 133, it can compress the third spring 135, thereby allowing the third spring 135 to store energy.

[0057] In this embodiment, each mounting block is provided with a cylinder 136 and a piston rod 137. The cylinder 136 is disposed on the mounting block. One end of the piston rod 137 is slidably disposed in the cylinder 136 along a third direction and divides the cylinder 136 into two chambers arranged along a third direction and isolated from each other. The other end of the piston rod 137 extends out of the cylinder 136 and is connected to the slide plate 131. The chamber away from the piston rod 137 is sealed and filled with liquid. The two chambers filled with liquid in the two cylinders 136 of the two extrusion mechanisms are connected by a hose.

[0058] Specifically, the reset component is a fourth spring 138, located within a liquid-filled chamber of the cylinder 136. The fourth spring 138 connects the piston rod 137 and the cylinder 136. The two piston rods 137 on the two mounting blocks slide in opposite directions in a third direction. When the sliding plate 131 on one mounting block first abuts against the corresponding second sliding plate 131, the corresponding rotating shaft 132 rotates. The liquid in the cylinder 136 on that mounting block flows through a hose to the cylinder 136 on the other mounting block. When the sliding plate 131 on the other mounting block slides, it drives the gear 133 to rotate. The gear 133 does not drive the corresponding rotating shaft 132 to rotate, and the other pressure plate 103 remains stationary. Only one pressure plate 103 is adjusted to avoid affecting adjustment efficiency by adjusting both pressure plates 103 simultaneously.

[0059] The working principle of the water supply and drainage pipeline pressure testing device provided in the above embodiment is as follows:

[0060] First, adjust the position of the positioning plate 123 according to the diameter of the pipe to be tested. Loosen the bolts on the positioning plate 123 so that the positioning plate 123 can slide on the mounting block. Then, move the positioning plate 123 closer to or further away from the horizontal plate 106. Adjust the elastic potential energy of the first spring 121, thereby indirectly adjusting the elastic potential energy of the second spring 122. Change the distance between the end of the second slide rod 108 away from the horizontal plate 106 and the horizontal plate 106 so that it is smaller than the diameter of the pipe to be tested.

[0061] Then, the pipe is placed on one of the annular belts 104, and the cross-section of the pipe is made as parallel as possible to the end face of the pressure plate 103. Then, the drive mechanism is activated, and the drive mechanism controls one of the fixed plates 125 to slide on the body 100. The two fixed plates 125 move closer to each other until the pipe contacts both annular belts 104 at the same time. Then, a certain pressure is applied to the pipe to make it have friction between it and the two annular belts 104. Then, the fixed plate 125 stops sliding.

[0062] At this time, the two rotating rollers 105 are controlled to slide synchronously in opposite directions and reciprocate in the second direction. The rotating rollers 105 drive the annular belt 104 on the pressure plate 103 to slide in the second direction. Under the action of the first slide rod 107, the first spring 121, the second slide rod 108 and the second spring 122, the annular belt 104 is always taut. The relative sliding of the two annular belts 104 will cause the pipe to rotate. The axis of the rotating pipe is parallel to the axis of the rotating shaft 132 and parallel to the end face of the pressure plate 103.

[0063] Then the drive mechanism is restarted to bring the two fixed plates 125 closer together, and the two pressure plates 103 begin to squeeze the pipe between them, thereby testing the pipe's pressure resistance.

[0064] When testing the pipe's compressive strength, the annular band 104 at the end of the second slide rod 108 gradually moves closer to the corresponding slide plate 131. If the two pressure plates 103 are parallel, the two slide plates 131 will simultaneously contact the corresponding annular band 104, pushing the second slide rod 108 closer to the horizontal plate 106. The second slide rod 108 compresses the second spring 122, which then releases energy and pushes the first slide rod 107 away from the horizontal plate 106. This causes the annular band 104 on the side of the first slide rod 107 and the second slide rod 108 away from the pipe to become taut, while the annular band 104 between the rotating rod on the second slide rod 108 and the first guide rod 113 becomes slack. The rotating rod on the first slide rod 107 will rotate, and the length of the annular band 104 between the rotating rod on the first slide rod 107 and the second guide rod 114 will increase.

[0065] After the pipeline's pressure resistance test is completed, the drive mechanism controls the two fixed plates 125 to move away from each other, and the mounting blocks on the two fixed plates 125 separate from each other. At this time, the elastic release energy of the second spring 122 is greater than the elastic potential energy of the first spring 121. The second spring 122 will push the second slide rod 108 away from the horizontal plate 106. The annular belt 104 between the rotating rod on the second slide rod 108 and the first guide rod 113 gradually tightens. When the annular belt 104 is fully tightened, the second slide rod 108 drives the first slide rod 107 to compress the first spring 121 through the annular belt 104. Since the rotating rod on the first slide rod 107 cannot reverse, the annular belt 104 between the rotating rod on the first slide rod 107 and the second guide rod 114 will move closer to the pressure plate 103. The annular belt 104 on the pressure plate 103 moves closer to the first guide rod 113, so that the part of the annular belt 104 that is not in contact with the pipeline slides onto the pressure plate 103.

[0066] When the two fixed plates 125 are separated from each other to the point where the pipe can be removed and the sliding plate 131 has not disengaged from the annular belt 104, the pipe is removed. At this time, the annular belt 104 can still slide on the pressure plate 103 so that impurities on the pressure plate 103 cannot come into contact with the pipe to be inspected later.

[0067] If the two pressure plates 103 are not parallel, one of the slide plates 131 can first contact the corresponding annular belt 104. At this time, the slide plate 131 can slide under the push of the second slide rod 108, thereby driving the gear 133 to rotate. After the gear 133 rotates, it can drive the rotating shaft 132 to rotate. The rotating shaft 132 drives the first baffle 139 to rotate. The first baffle 139 moves closer to the second baffle 140 and compresses the third spring 135. The third spring 135 applies a pushing force to the second baffle 140. Since there is friction between the boss and the mounting shell 126, the mounting shell 126 will not rotate immediately. When the elastic potential energy of the third spring 135 accumulates to a certain extent, it can push the second baffle 140 to rotate. The rotation of the second baffle 140 drives the main block 101 to rotate through the boss, and then drives the pressure plate 103 to rotate, so that the two pressure plates 103 are parallel.

[0068] A method for pressure testing of water supply and drainage pipelines includes the following steps:

[0069] S1. Place the pipe on the pressure plate 103 located below, so that the pipe axis extends along the first direction and the end face of the pipe is as parallel as possible to the end face of the pressure plate 103, and the pipe contacts the annular band 104 on the pressure plate 103.

[0070] S2. Start the drive mechanism to control the two mounting blocks to move closer to each other until the annular belts 104 on both mounting blocks are in contact with the pipe.

[0071] S3. Control the two rotating rollers 105 to slide synchronously and in opposite directions, and make the two rotating rollers 105 slide back and forth in the second direction. When the two rotating rollers 105 slide, they will drive the corresponding annular belts 104 to slide on the pressure plate 103. The two annular belts 104 rub the pipe, causing the pipe to rotate around its own axis. The extension direction of the rotating pipe axis will gradually become perpendicular to the movement direction of the annular belts 104 on the pressure plate 103, until the end face of the pipe is parallel to the end face of the pressure plate 103.

[0072] S4. Control the two mounting blocks to continue moving closer to each other and squeezing the pipe. During the pipe pressure resistance test, the first slide bar 107 will gradually move closer to the corresponding slide plate 131 until it contacts it. If the two second slide bars 108 simultaneously abut against the corresponding slide plates 131, the two slide plates 131 will not slide on their respective mounting blocks under the action of the piston rod 137 and the liquid in the cylinder 136. The pressure plate 103 on the mounting block will be in a parallel state and the third spring 135 on the mounting block will not store energy.

[0073] If the two second sliding rods 108 abut against the corresponding sliding plates 131 one after the other, the second sliding rod 108 that abuts against the sliding plate 131 first will push the sliding plate 131 to slide on the mounting block, thereby causing the third spring 135 on the mounting block to store energy. The amount of energy released by the third spring 135 after storing energy is proportional to the distance the sliding plate 131 slides. When the parallelism between the two pressure plates 103 is greater than the error range, the third spring 135 can make the mounting block rotate to reduce the parallelism error; when the parallelism between the two pressure plates 103 is less than the error range, the energy stored by the third spring 135 is relatively small, and it needs to store energy several times to make the mounting block rotate, so that the pipeline is relatively stable during the inspection process.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A pressure resistance testing device for water supply and drainage pipelines, characterized in that, include: The machine body comprises two extrusion mechanisms. Each extrusion mechanism includes a mounting block, a pressure plate, an annular belt, an adjusting component, and a buffer component. The mounting block is rotatably mounted on the machine body around a preset axis and is located on one side of the vertical direction of the pipeline. The preset axis is horizontally positioned and parallel to the pipeline axis. The extension direction of the preset axis is defined as a first direction. The pressure plate is mounted on the mounting block. The annular belt wraps around the circumference of the pressure plate and can slide relative to it. The annular belt contacts the pipeline. The adjusting component includes a rotating roller and a tensioning section. The rotating roller is positioned inside the annular belt and slides on the mounting block along a second direction, perpendicular to the first direction. The plane containing both the first and second directions is parallel to the pressure plate. The roller contacts the annular belt and can drive the annular belt to slide. Through the cooperation of the annular belts in the two extrusion mechanisms, the pipe can rotate around its own axis and gradually make the extension direction of its own axis perpendicular to the sliding direction of the annular belt on the pressure plate, so that the end face of the pipe can be parallel to the end face of the pressure plate. The tension section is used to keep the annular belt in a taut state and can adjust the parallelism between the two pressure plates. The two extrusion mechanisms are arranged vertically and symmetrically about the pipe axis by rotating 180°. The mounting blocks in the two extrusion mechanisms can move closer or further apart from each other in the vertical direction. The buffer assembly is used to limit the frequent adjustment of the two pressure plates within the parallelism error range by the tension section.

2. The pressure resistance testing device for water supply and drainage pipelines according to claim 1, characterized in that, The tension section includes a horizontal plate, a telescopic rod, and a first elastic element. The horizontal plate is disposed on the mounting block and arranged sequentially with the pressure plate and the rotating roller along the second direction. The horizontal plate is located inside the annular belt. The telescopic rod passes through the horizontal plate along a third direction and is slidably connected to the horizontal plate. The third direction is perpendicular to the first direction and the second direction, respectively. The first elastic element ensures that the telescopic rod always has a tendency to elongate.

3. The pressure resistance testing device for water supply and drainage pipelines according to claim 2, characterized in that, The telescopic rod includes a first slide rod and a second slide rod. The first slide rod is sleeved on the second slide rod and is slidably connected to the cross plate. The first slide rod is located at the end of the second slide rod away from the mounting block in another extrusion mechanism. The first slide rod and the second slide rod can move closer to or further away from the mounting block in another extrusion mechanism along a third direction. Rotating rods are respectively provided at the two ends of the first slide rod and the second slide rod that are far apart from each other. Each rotating rod extends along a first direction and is rotatably connected to the corresponding first slide rod or second slide rod around its own axis. The first slide rod and the corresponding rotating rod are unidirectionally rotatably connected, which is used to control the unidirectional sliding of the annular belt in contact with the pressure plate when the first slide rod and the second slide rod simultaneously approach the mounting block in another extrusion mechanism. The first elastic element includes a first spring and a second spring. The first spring is sleeved on the first slide rod and connects the first slide rod and the cross plate. The second spring is sleeved on the second slide rod and connects the second slide rod and the cross plate.

4. The pressure resistance testing device for water supply and drainage pipelines according to claim 3, characterized in that, The mounting block is equipped with a positioning plate, which is slidably mounted on the mounting block along a third direction and located between the horizontal plate and the first spring. The first spring is connected to the horizontal plate through the positioning plate, and the positioning plate is fixedly connected to the mounting block by bolts.

5. The pressure resistance testing device for water supply and drainage pipelines according to claim 3, characterized in that, The machine body is equipped with a fixed plate and a drive mechanism. There are two fixed plates, which are arranged vertically. One fixed plate is fixedly mounted on the machine body, and the other fixed plate is slidably mounted on the machine body. Each fixed plate has a mounting shell on its side that is close to each other. The mounting block in each extrusion mechanism is rotatably connected to a mounting shell. The mounting block is connected to the machine body through the mounting shell. The drive mechanism is used to drive the fixed plate that is slidably mounted on the machine body to slide.

6. The pressure resistance testing device for water supply and drainage pipelines according to claim 5, characterized in that, There is friction between the mounting block and the mounting shell, and the friction is less than the elastic force of the second spring.

7. The pressure resistance testing device for water supply and drainage pipelines according to claim 5, characterized in that, The buffer assembly includes a sliding plate, a rotating shaft, a second elastic element, and a reset element. The sliding plate is slidably mounted on the mounting block in a third direction and can abut against a second sliding rod in another extrusion mechanism in a third direction. The rotating shaft is rotatably mounted on the mounting block and has a gear sleeved on it. The gear is unidirectionally rotatably connected to the rotating shaft. The sliding plate has teeth and meshes with the gear through the teeth. When the sliding plate moves away from the mounting block in the other extrusion mechanism, the gear can drive the rotating shaft to rotate. The second elastic element is wound around the rotating shaft and connects the rotating shaft and the mounting block. The second elastic element can store energy when the rotating shaft rotates relative to the mounting block. The reset element is used to reset the sliding plate.

8. The pressure resistance testing device for water supply and drainage pipelines according to claim 7, characterized in that, The shaft and the mounting housing are connected in one direction. When the gear rotates synchronously with the shaft, the shaft can rotate relative to the mounting housing.

9. A pressure testing device for water supply and drainage pipelines according to claim 7, characterized in that, Each mounting block is equipped with a cylinder and a piston rod. The cylinder is mounted on the mounting block. One end of the piston rod is slidably mounted in the cylinder along a third direction and divides the cylinder into two mutually isolated chambers arranged along a third direction. The other end of the piston rod extends out of the cylinder and is connected to the slide plate. The chamber away from the piston rod is sealed and filled with liquid. The two liquid-filled chambers in the two cylinders of the two extrusion mechanisms are connected by a hose.

10. A method for testing the compressive strength of water supply and drainage pipelines, utilizing the compressive strength testing device for water supply and drainage pipelines as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Place the pipe on the pressure plate located below, so that the pipe axis extends along the first direction and the pipe contacts the annular strip on the pressure plate; S2. Control the two mounting blocks to move closer to each other until the annular strips on both mounting blocks are in contact with the pipe; S3. Control the two rotating rollers to slide synchronously and in opposite directions, and make the two rotating rollers slide back and forth in the second direction until the pipe end face is parallel to the pressure plate end face. S4. Control the two mounting blocks to continue to move closer to each other and squeeze the pipe.

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