Pipeline pressure resistance testing device and testing method thereof

Abstract

The application relates to the technical field of pipeline pressure resistance testing devices, and discloses a pipeline pressure resistance testing device and a testing method thereof. The device comprises a supporting mechanism, a measuring mechanism and an adjusting assembly. The measuring mechanism is located in the inside of the supporting mechanism, and the adjusting assembly is located on one side of the measuring mechanism. The supporting mechanism comprises a gantry support. A load-bearing platform is arranged at the bottom of the gantry support. A measuring support rod is slidably arranged at the middle part of the gantry support. The flexible clamping plate of the sliding clamp and the film expansion mechanism are used to realize self-adaptive fixing of pipelines with different diameters, so that pipeline sliding during the testing process is effectively prevented. The electromagnetic iron drive sliding plate controls the limiting spring one, so that the inner diameter measuring cross rod is automatically attached to the inner wall of the pipeline. Automatic centering is realized in combination with the displacement sensor feedback. The design not only guarantees the reliability of fixing, but also avoids the interference of rigid constraint on deformation measurement, and significantly improves the testing precision and operation convenience.

Description

Technical Field

[0001] This invention relates to the field of pipeline pressure testing equipment, and particularly to a pipeline pressure testing equipment and its testing method. Background Technology

[0002] As an important industrial transportation component, the pressure resistance of pipelines is a key indicator for evaluating structural safety and service life. In fields such as petrochemicals and municipal engineering, pipelines need to withstand complex stresses such as internal fluid pressure and external soil loads. Therefore, pressure testing has become a core part of product quality control.

[0003] Chinese patent CN217277479U discloses a pipeline pressure resistance testing device, relating to the field of corrugated pipe pressure resistance technology. The device includes a fixed base, a U-shaped frame fixedly installed on the upper surface of the fixed base, a hydraulic cylinder fixedly installed at the center of the U-shaped frame, a compression plate fixedly installed at the output end of the hydraulic cylinder, and a spring mechanism installed inside the center of the fixed base. The spring mechanism includes a convex groove, which is formed inside the center of the fixed base.

[0004] Based on the aforementioned existing technology, it has been found that during the pressure test of the pipeline, when the hydraulic plate applies downward pressure, the pipeline may roll, slide, or slightly lift on the platform due to the reaction force, which disrupts the boundary conditions of the test. This makes the measurement results unable to truly reflect the pure compression deformation of the pipeline. When manually placing the pipeline into the two inner diameter measuring crossbars, it is difficult to ensure that the pipeline axis is completely perpendicular and aligned with the center line of the gantry support and the center of force application of the hydraulic plate. Slight deviation or misalignment will lead to uneven force on the pipeline during subsequent pressure application, resulting in unexpected bending or torsion. Summary of the Invention

[0005] The purpose of this invention is to provide a pipeline pressure testing device and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pipeline pressure resistance testing device, comprising a support mechanism, a measuring mechanism, and an adjustment component. The measuring mechanism is located inside the support mechanism, and the adjustment component is located on one side of the measuring mechanism. The support mechanism includes a gantry support, a load-bearing platform is provided at the bottom of the gantry support, and a measuring support rod is slidably provided in the middle of the gantry support. The left and right sides of the measuring support rod are slidably connected to the left and right sides of the inner wall of the gantry support.

[0007] The measuring support rod is equipped with a hydraulic push rod inside, and the output end of the hydraulic push rod is equipped with a hydraulic plate. The hydraulic plate is vertically installed inside the gantry bracket, and the hydraulic push rod can control the hydraulic plate to move longitudinally inside the gantry bracket.

[0008] The measuring mechanism includes a longitudinal connecting rod, the top of which is movably disposed at the bottom of a measuring support rod. The longitudinal connecting rod is perpendicular to the measuring support rod. A limiting ring is provided at the end of the longitudinal connecting rod away from the measuring support rod, and the limiting ring is fixedly disposed on the outer side of the bottom end of the longitudinal connecting rod. A limiting spring is provided above the limiting ring, passing through the longitudinal connecting rod and located at the top of the limiting ring. An inner diameter measuring unit is engaged with the outer surface of the longitudinal connecting rod. The measuring mechanism also includes a measuring pipe.

[0009] Preferably, the inner diameter measuring unit includes two inner diameter measuring crossbars and a displacement sensor, wherein the displacement sensor is provided with a pre-tensioned steel wire, and the pre-tensioned steel wire is located between the two inner diameter measuring crossbars;

[0010] One end of the inner diameter measuring crossbar is movably connected to the outer surface of the longitudinal connecting rod, and the end of the inner diameter measuring crossbar near the longitudinal connecting rod is in contact with the end of the limiting spring. The limiting spring can cooperate with the limiting ring to limit the end of the inner diameter measuring crossbar.

[0011] Preferably, the measuring mechanism further includes a second longitudinal connecting rod, which is located at the top of the load-bearing platform. A second limiting ring is provided at the end of the second longitudinal connecting rod away from the load-bearing platform. A second limiting spring is provided at the top of the second limiting ring. The second limiting spring is sleeved on the outer surface of the second longitudinal connecting rod. Another inner diameter measuring crossbar is movably connected to the outer surface of the second longitudinal connecting rod.

[0012] Preferably, the two ends of the limiting spring two are in contact with the ends of the limiting ring two and the inner diameter measuring crossbar, respectively. The limiting spring two limits the ends of the inner diameter measuring crossbar through the limiting ring two. The outer surfaces of the two inner diameter measuring crossbars are located at the top and bottom of the inner wall of the measuring pipe, respectively, and the outer surfaces of the two inner diameter measuring crossbars are in close contact with the inner diameter surface of the measuring pipe.

[0013] Preferably, the adjustment component includes a sliding groove, which is located on the surface of the load-bearing platform. A linear drive device is provided inside the sliding groove, and a sliding block is provided at the output end of the linear drive device. The outer surface of the sliding block is slidably connected to the inside of the sliding groove, and the top of the sliding block is connected to a sliding clamp.

[0014] The linear drive device, the sliding block, and the sliding clamp are each at least two, and the two linear drive devices, the sliding blocks, and the sliding clamps are symmetrically arranged on the surface of the load-bearing platform. The two symmetrically arranged linear drive devices can drive the two sliding blocks to move closer or further apart from each other along the interior of the sliding groove. The linear drive device can clamp and position the surface of the measuring pipe through the sliding clamp.

[0015] Preferably, the sliding clamp includes a flexible clamping plate and a piston mechanism. The piston mechanism consists of a miniature push rod and a piston plate. The flexible clamping plate is located inside the sliding clamp, and one side of the flexible clamping plate is hinged to one side of the inner wall of the sliding clamp. The other side of the flexible clamping plate has a shrinkage band that is movably connected to the sliding plate. The shrinkage band sequentially covers the flexible clamping plate and the sliding clamp. The interior of the flexible clamping plate and the sliding clamp forms an accommodating space through the shrinkage band. The surface of the flexible clamping plate is provided with multiple through holes, and each through hole has a mutually compatible thin film inside.

[0016] Preferably, the piston mechanism is located inside the sliding clamp, the micro push rod is fixedly disposed on the side of the inner wall of the sliding clamp away from the flexible clamping plate, and the end of the micro push rod near the flexible clamping plate is fixedly connected to one side of the piston plate. The four sides of the piston plate are in close contact with the four sides of the inner wall of the sliding clamp. The micro push rod can control the piston plate to slide inside the sliding clamp, and the piston plate, together with the flexible clamping plate and the connecting belt, forms a sealed space inside the sliding clamp. An air inlet is provided on the side of the inner wall of the sliding clamp near the micro push rod.

[0017] Preferably, when the micro push rod is in the extended state, the piston plate moves along the inner wall of the sliding clamp toward the flexible clamp, and external gas enters the area between the piston plate and the micro push rod. The area between the piston plate and the micro push rod is always in a positive pressure balance state. The flexible clamp deflects along one side of the sliding clamp toward the direction away from the piston plate, and the air pressure between the piston plate and the flexible clamp gradually increases.

[0018] When the micro push rod is in its fully extended state, the piston plate moves along the inner wall of the sliding clamp toward the flexible clamp. The area between the piston plate and the micro push rod draws in external gas, and the area between the piston plate and the micro push rod is always in a state of positive pressure balance. The flexible clamp deflects to its maximum angle away from the piston plate along one side of the sliding clamp. The air pressure between the piston plate and the flexible clamp gradually increases, and multiple films on the flexible clamp are in an expanded state.

[0019] The adjustment assembly also includes an electromagnet and a sliding plate. The number of electromagnets and sliding plates is set to multiple, and each electromagnet is located on one side of the first limiting ring and the second limiting ring. Each sliding plate is sleeved on the outer surface of the first longitudinal connecting rod and the second longitudinal connecting rod, and one side of each sliding plate is connected to one end of the first limiting spring and the second limiting spring. The electromagnet can drive the sliding plate to move longitudinally.

[0020] The present invention also provides a testing method for a pipeline pressure testing device, comprising the following steps:

[0021] S1. Control the measuring support rod to slide longitudinally down in the gantry bracket, driving the longitudinal connecting rod and the inner diameter measuring unit installed thereon into the measuring pipe until the inner diameter measuring unit maintains contact with the inner wall of the measuring pipe under the pre-tightening force of the limiting spring, thus forming a preliminary positioning of the measuring pipe.

[0022] S2. Real-time detection of whether the measuring pipe is tilted is performed using a measuring mechanism, and fine-tuning of the measuring pipe using an adjustment component until the data from the measuring mechanism is within the normal threshold.

[0023] S3. The hydraulic plate is driven downward by the hydraulic push rod to apply pressure to the outer wall of the pipe. At the same time, the inner diameter measuring unit monitors and acquires the deformation data of the pipe under pressure. Based on the deformation data monitored by the inner diameter measuring unit, the pressure application and release of the hydraulic push rod are controlled to complete the test cycle.

[0024] The technical effects and advantages of this invention are as follows:

[0025] 1. This invention achieves adaptive fixing of pipes of different diameters through the flexible clamping plate and thin film expansion mechanism of the sliding fixture, effectively preventing pipe slippage during testing. An electromagnet drives the sliding plate to control the limiting spring, causing the inner diameter measuring crossbar to automatically conform to the inner wall of the pipe, and automatic centering is achieved in conjunction with feedback from a displacement sensor. This design ensures reliable fixing while avoiding interference from rigid constraints on deformation measurement, significantly improving testing accuracy and ease of operation.

[0026] 2. This invention, through the linear drive control of the sliding clamp in the assembly, can quickly adapt to the outer diameter of the pipe. Combined with a piston mechanism that adjusts the deflection and film expansion of the flexible clamp in stages, it provides reliable anti-slip fixation while allowing the pipe to deform freely under pressure, avoiding stress concentration. An electromagnet drives the sliding plate to dynamically adjust the preload of the limiting spring, ensuring optimal contact throughout the installation, alignment, and testing process: during installation, the electromagnet releases its constraint to facilitate pipe insertion; during alignment, a displacement sensor automatically fine-tunes the pipe position to ensure precise axis alignment; and during testing, the current is dynamically adjusted to maintain the tracking performance of the measuring head and reduce interference. This not only improves the accuracy of test data but also significantly reduces manual operation intensity, supports rapid model changeover and batch testing, and is highly practical and economical. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a front view of the overall structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the installation state of the inner diameter measuring crossbar and measuring pipe of the present invention;

[0030] Figure 4 This is a schematic diagram of the sliding clamp and related structures of the present invention;

[0031] Figure 5 This is a schematic diagram of the initial internal structure of the sliding clamp of the present invention;

[0032] Figure 6 This is a schematic diagram of the linear drive device of the present invention in an extended state;

[0033] Figure 7 This is a schematic diagram showing the installation state of the flexible clamping plate and sliding clamp of the present invention;

[0034] Figure 8 This is a schematic diagram of the electromagnet and sliding plate installation state of the present invention;

[0035] Figure 9 This is a schematic diagram of the assembly state of the measuring support frame and electric push rod of the present invention;

[0036] Figure 10 This is a schematic diagram of the assembly state of the snap-fit ​​component and the inner diameter measuring crossbar of the present invention;

[0037] Figure 11 This is a schematic diagram of the assembly structure of the inner diameter measuring crossbar, the pre-tensioned steel wire assembly, and the displacement sensor of the present invention.

[0038] Figure 12This is a schematic diagram of the assembly state of the sliding clamp and miniature push rod of the present invention.

[0039] In the diagram: 1. Support mechanism; 101. Gantry bracket; 102. Load-bearing platform; 103. Top plate; 104. Measuring support rod; 105. Hydraulic push rod; 106. Hydraulic plate; 107. Electric push rod; 108. Linear drive device; 2. Measuring mechanism; 201. Longitudinal connecting rod one; 202. Inner diameter measuring crossbar; 203. Limiting ring one; 204. Limiting spring one; 205. Measuring pipe; 206. Limiting ring two; 207. Limiting spring two; 208. Longitudinal connecting rod two; 209. Wedge-shaped block; 210. Limiting round tube; 211. Snap-fit ​​component; 3. Adjustment assembly; 301. Sliding clamp; 302. Flexible clamping plate; 303. Miniature push rod; 304. Membrane; 305. Piston plate; 306. Shrinkage belt; 307. Electromagnet; 308. Sliding plate. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] This invention provides, for example Figures 1 to 12 The pipeline pressure resistance testing device shown includes a support mechanism 1, a measuring mechanism 2, and an adjustment component 3. The measuring mechanism 2 is located inside the support mechanism 1, and the adjustment component 3 is located on one side of the measuring mechanism 2. The measuring mechanism 2 is used to measure the deformation of the outer side of the pipeline, while the adjustment component 3 is used to adaptively fix the pipeline to be measured.

[0043] The support mechanism 1 includes a gantry bracket 101. The bottom of the gantry bracket 101 is provided with a load-bearing platform 102, which is used to support the pipe to be measured. A measuring support rod 104 is slidably provided in the middle of the gantry bracket 101. The left and right sides of the measuring support rod 104 are slidably connected to the left and right sides of the inner wall of the gantry bracket 101. An electric push rod 107 is provided at the top of the measuring support rod 104. The electric push rod 107 can control the measuring support rod 104 to slide longitudinally inside the gantry bracket 101.

[0044] The measuring support rod 104 is equipped with a hydraulic push rod 105 inside, and a hydraulic plate 106 is provided at the output end of the hydraulic push rod 105. The hydraulic plate 106 is vertically arranged inside the gantry bracket 101. The hydraulic push rod 105 can control the hydraulic plate 106 to move longitudinally inside the gantry bracket 101. The hydraulic plate 106 can apply pressure to the outside of the pipe to be measured. A control panel is provided on one side of the gantry bracket 101. The control panel can adjust the position of the measuring support rod 104 and the pressure value of the hydraulic plate 106 on the outside of the pipe to be measured through the electric push rod 107 and the hydraulic push rod 105 respectively. A top plate 103 is fixedly provided at the bottom of the gantry bracket 101.

[0045] A measuring mechanism 2 is movably mounted at the bottom of the measuring support rod 104. The measuring mechanism 2 includes a longitudinal connecting rod 201, the top of which is movably mounted at the bottom of the measuring support rod 104. The longitudinal connecting rod 201 is perpendicular to the measuring support rod 104. A limiting ring 203 is provided at the end of the longitudinal connecting rod 201 away from the measuring support rod 104, and the limiting ring 203 is fixedly mounted on the outer side of the bottom end of the longitudinal connecting rod 201. A limiting spring 204 is provided above the limiting ring 203, passing through the longitudinal connecting rod 201 and located at the top of the limiting ring 203. An inner diameter measuring unit is snapped onto the outer surface of the longitudinal connecting rod 201. The inner diameter measuring unit includes two inner diameter measuring crossbars 202, a displacement sensor, and a snap-fit ​​component. A pre-tensioned steel wire is provided in the displacement sensor, and the pre-tensioned steel wire is located on the two inner diameter measuring crossbars 202. Between 2, there are multiple snap-fit ​​pieces 211, which are located at the left and right ends of the two inner diameter measuring crossbars respectively. The snap-fit ​​piece 211 has a limiting round tube 210 slidingly inside. The end of the limiting round tube 210 facing the snap-fit ​​piece 211 has a wedge-shaped locking block 209. The end of the limiting round tube 210 away from the snap-fit ​​piece 211 has a compression spring. The initial state of the compression spring can provide a force to the limiting round tube 210 in the direction of the snap-fit ​​piece 211. There are multiple limiting round tubes 210, wedge-shaped locking blocks 209 and compression springs. Each limiting round tube 210, wedge-shaped locking block 209 and compression spring are symmetrically arranged on the left and right sides of the snap-fit ​​piece. The snap-fit ​​piece 211 can cooperate with the limiting spring 204 to provide vertical and horizontal limits to the end of the inner diameter measuring crossbar 202, so as to prevent the inner diameter measuring crossbar 202 from falling off during the measurement of the round tube.

[0046] One end of the inner diameter measuring crossbar 202 is movably connected to the outer surface of the longitudinal connecting rod 201, and the end of the inner diameter measuring crossbar 202 near the longitudinal connecting rod 201 is in contact with the end of the limiting spring 204. The limiting spring 204 can cooperate with the limiting ring 203 to limit the end of the inner diameter measuring crossbar 202, so as to prevent the inner diameter measuring crossbar 202 from falling off or becoming detached during the process of applying pressure to the outer surface of the pipe to be measured.

[0047] The measuring mechanism 2 also includes a second longitudinal connecting rod 208, which is located at the top of the load-bearing platform 102. A second limiting ring 206 is provided at the end of the second longitudinal connecting rod 208 away from the load-bearing platform 102. A second limiting spring 207 is provided at the top of the second limiting ring 206. The second limiting spring 207 is sleeved on the outer surface of the second longitudinal connecting rod 208. Another inner diameter measuring crossbar 202 is movably connected to the outer surface of the second longitudinal connecting rod 208. The two ends of the second limiting spring 207 are respectively... The limiting spring 207 contacts the end of the limiting ring 206 and the inner diameter measuring crossbar 202. The limiting spring 207 limits the end of the inner diameter measuring crossbar 202 through the limiting ring 206. The outer surfaces of the two inner diameter measuring crossbars 202 are fitted with measuring pipes 205, and the outer surfaces of the two inner diameter measuring crossbars 202 are located at the top and bottom of the inner wall of the measuring pipes 205, respectively. The outer surfaces of the two inner diameter measuring crossbars 202 are in close contact with the inner diameter surface of the measuring pipes 205.

[0048] In use, first place the measuring pipe 205. During placement, firstly, the limiting springs 204 and 207 should be pushed to the side to release the constraints on the two corresponding inner diameter measuring crossbars 202. Then, pull the two inner diameter measuring crossbars 202 outwards along their respective connecting longitudinal rods, disengaging their ends from the end surfaces of the longitudinal rods, thus creating an opening between the two sets of rods for the measuring pipe 205 to pass through. Next, place the measuring pipe 205 horizontally on the load-bearing platform 102 and slip it through this opening onto the outside of the two inner diameter measuring crossbars 202. After the measuring pipe 205 is in place, the two inner diameter measuring crossbars 202 are loosened and closed. Under the restoring force of the limiting spring 1 204 and the limiting spring 207, the ends are pressed between their respective limiting rings and the end faces of the longitudinal connecting rods. Under the continuous action of this force, the outer surfaces of the two inner diameter measuring crossbars 202 are tightly and stably attached to the top and bottom of the inner wall of the measuring pipe 205, respectively. They are also limited by the snap-fit ​​pieces 211 at the left and right ends of the two inner diameter measuring crossbars 202 to prevent the two inner diameter measuring crossbars 202 from falling off during the measurement process.

[0049] Subsequently, by operating the control panel, the electric push rod 107 is activated, driving the measuring support rod 104 to slide smoothly downwards along the gantry bracket 101. This causes the longitudinal connecting rod 201 installed at its bottom and the upper inner diameter measuring crossbar 202 connected to it to descend together until the inner diameter measuring crossbar 202, under the action of spring force, maintains a predetermined pressure contact with the inner top wall of the already positioned measuring pipe 205. At this time, the lower inner diameter measuring crossbar 202 is in contact with the inner bottom wall of the measuring pipe 205 under the action of the longitudinal connecting rod 208 and the limiting spring 207. The pre-tensioned steel wire inside the displacement sensor is connected between the two inner diameter measuring crossbars 202, and the system completes the initial calibration.

[0050] After preparation, the pressure test begins. The hydraulic push rod 105 is set and activated via the control panel, pushing the hydraulic plate 106 downwards to apply a vertically downward pressure load to the top of the outer wall of the measuring pipe 205. Under external pressure, the measuring pipe 205 gradually undergoes compressive deformation.

[0051] As the measuring pipe 205 is pressurized, its inner diameter decreases vertically. This change pushes the two inner diameter measuring crossbars 202, which are tightly fitted to the upper and lower surfaces of the inner wall of the measuring pipe 205, to overcome part of the elastic force of their respective limiting springs 204 and move towards each other along the longitudinal connecting rod. The shortening of the relative distance between the two inner diameter measuring crossbars 202 causes the pre-tensioned steel wire connected between them to be displaced. A high-precision displacement sensor detects the displacement of this steel wire in real time and continuously and converts it into an electrical signal, thereby accurately measuring the inner diameter deformation of the measuring pipe 205 during the pressurization process (i.e., an indirect reflection of the outer wall deformation). The synergistic effect of the limiting springs 204 and the limiting ring ensures that the inner diameter measuring crossbars 202 are always well fitted to the pipe wall throughout the entire pressurization and measurement process, and that their movement trajectory is stable without shaking or detachment.

[0052] After the test is completed, the hydraulic push rod 105 retracts, the hydraulic plate 106 rises to relieve the load, and the electric push rod 107 drives the measuring support rod 104 and its measuring components to rise, exiting the measuring pipe 205 and returning to the initial position. Finally, the pressure values ​​and corresponding deformation data throughout the pressurization process can be read and recorded through the control panel, completing the test of the pressure resistance of the measuring pipe 205.

[0053] Example 2

[0054] In the compression test of the measuring pipe 205 in Example 1, when the hydraulic plate 106 applies downward pressure, the measuring pipe 205 may roll, slide, or slightly lift on the platform due to the reaction force, which disrupts the boundary conditions of the test. This makes the measurement results unable to truly reflect the pure compression deformation of the measuring pipe 205. In addition, during the process of manually measuring the pipe 205 and fitting it into the two inner diameter measuring crossbars 202, it is difficult to ensure that the axis of the measuring pipe 205 is completely perpendicular and aligned with the center line of the gantry support 101 and the center of force application of the hydraulic plate 106. Slight deviation or misalignment will cause uneven force on the measuring pipe 205 during subsequent pressure application, resulting in unexpected bending or torsion, which seriously affects the accuracy of deformation data and the repeatability of the test.

[0055] Adjustment component 3 is set on the surface of load-bearing platform 102. Adjustment component 3 includes a sliding groove, and the sliding groove is located on the surface of load-bearing platform 102. A linear drive device 108 is provided inside the sliding groove. A sliding block is provided at the output end of the linear drive device 108. The outer surface of the sliding block is slidably connected to the inside of the sliding groove. The top of the sliding block is connected to the sliding clamp 301. The number of linear drive devices 108, sliding blocks and sliding clamps 301 is at least two. The two linear drive devices 108, sliding blocks and sliding clamps 301 are symmetrically arranged on the surface of load-bearing platform 102. The two symmetrically arranged linear drive devices 108 can drive the two sliding blocks to move closer or further away from each other along the inside of the sliding groove. The linear drive device 108 can clamp and position the surface of the measuring pipe 205 through the sliding clamp 301. The linear drive device 108 can be a pneumatic push rod or an electric drive rod and a hydraulic cylinder or other linear drive power source.

[0056] The sliding clamp 301 includes a flexible clamping plate 302 and a piston mechanism. The piston mechanism consists of a miniature push rod 303 and a piston plate 305. The flexible clamping plate 302 is located inside the sliding clamp 301, and one side of the flexible clamping plate 302 is hinged to one side of the inner wall of the sliding clamp 301. The other side of the flexible clamping plate 302 has a shrinkage band 306 that is movably connected to the sliding plate 308. The shrinkage band 306 sequentially covers the flexible clamping plate 302 and the sliding clamp 301. The interior of the flexible clamping plate 302 and the sliding clamp 301 forms an accommodating space through the shrinkage band 306. The surface of the flexible clamping plate 302 is provided with multiple through holes, and each through hole is provided with a mutually compatible thin film 304.

[0057] The piston mechanism is located inside the sliding clamp 301. The micro push rod 303 is fixedly installed on the inner wall of the sliding clamp 301 away from the flexible clamp 302. The end of the micro push rod 303 near the flexible clamp 302 is fixedly connected to one side of the piston plate 305. The four sides of the piston plate 305 are in close contact with the four sides of the inner wall of the sliding clamp 301. The micro push rod 303 can control the piston plate 305 to slide inside the sliding clamp 301. The piston plate 305, together with the flexible clamp 302 and the connecting belt, forms a sealed space inside the sliding clamp 301. An air inlet is provided on the inner wall of the sliding clamp 301 near the micro push rod 303.

[0058] When the micro push rod 303 is in the extended state, the piston plate 305 moves along the inner wall of the sliding clamp 301 toward the flexible clamp 302. The area between the piston plate 305 and the micro push rod 303 draws external gas into the interior, and the area between the piston plate 305 and the micro push rod 303 is always in a positive pressure balance state. The flexible clamp 302 deflects away from the piston plate 305 along one side of the sliding clamp 301, and the air pressure between the piston plate 305 and the flexible clamp 302 gradually increases.

[0059] When the micro push rod 303 is in its fully extended state, the piston plate 305 moves along the inner wall of the sliding clamp 301 toward the flexible clamp 302. The area between the piston plate 305 and the micro push rod 303 draws external gas into the interior, and the area between the piston plate 305 and the micro push rod 303 is always in a positive pressure balance state. The flexible clamp 302 deflects to the maximum angle along one side of the sliding clamp 301 away from the piston plate 305. The air pressure between the piston plate 305 and the flexible clamp 302 gradually increases, and the multiple films 304 on the flexible clamp 302 are in an expanded state.

[0060] Adjustment component 3 also includes an electromagnet 307 and a sliding plate 308. Multiple electromagnets 307 and sliding plates 308 are provided, with each electromagnet 307 located on one side of the first limiting ring 203 and the second limiting ring 206. Each sliding plate 308 is sleeved on the outer surface of the first longitudinal connecting rod 201 and the second longitudinal connecting rod 208, and one side of each sliding plate 308 is connected to one end of the first limiting spring 204 and the second limiting spring 207. The electromagnet 307 can drive the sliding plate 308 to move longitudinally. The specific adjustment process is as follows:

[0061] After the measuring pipe 205 is installed, the automatic program is started through the control panel. The linear drive device 108 first drives the sliding clamps 301 on both sides to move synchronously towards each other until the flexible clamp 302 on the inner side contacts the outer wall of the measuring pipe 205. At this time, the piston mechanism performs the first stage action, pushing the flexible clamp 302 to deflect around the hinge point, so that its concave arc contour adaptively fits the curvature of the outer wall of the measuring pipe 205, achieving initial clamping. Then, the piston mechanism enters the second stage, delivering the medium into the cavity inside the clamp, causing the multiple independent thin film 304 units embedded on the surface of the clamp to generate uniform radial expansion, thereby applying a uniformly distributed normal pressure and static friction force to the outer wall of the measuring pipe 205. This process achieves adaptive and flexible firm clamping of the measuring pipe 205, physically constraining the macroscopic displacement of the measuring pipe 205, and effectively preventing it from sliding, rolling or deviating in subsequent pressure tests.

[0062] During installation or disassembly, the energization state and current of the electromagnet 307 are precisely controlled by the control system. During installation, when the inner diameter measuring unit needs to be inserted into the measuring pipe 205, the control system applies a strong current to the electromagnet 307, generating an electromagnetic attraction sufficient to overcome the preload of the limiting spring 204. This force attracts the sliding plate 308 towards the electromagnet 307, thereby fully compressing the limiting spring 204 and completely disengaging it from the end of the inner diameter measuring crossbar 202, releasing all constraints. At this point, the two inner diameter measuring crossbars 202 can be easily pried open, allowing the measuring pipe 205 to be smoothly inserted. After the measuring pipe 205 is inserted, the control system reduces the current of the electromagnet 307 to the set value, weakening the electromagnetic attraction. The sliding plate 308 moves in the opposite direction under the restoring force of the limiting spring 204 until the spring end presses against the end of the inner diameter measuring crossbar 202 with precisely controlled pressure. This pressure is transmitted through the crossbar, causing its outer side to fit tightly against the inner wall of the measuring pipe 205. The magnitude of this contact pressure can be controlled by a preset program or by an automatically matched current value based on the nominal inner diameter of the measuring pipe 205, thereby achieving adaptive pre-tightening fit for measuring pipes 205 with different inner diameters. This also enables one-button automated operation for installation and disassembly, completely eliminating the tedious manual spring manipulation steps.

[0063] Simultaneously, during the installation process, after the adaptive pre-tightening is completed, the control system immediately initiates the centering adjustment program, keeping the upper and lower electromagnets 307 under constant current in "centering mode". This causes the two inner diameter measuring crossbars 202 to press against the top and bottom of the inner wall of the measuring pipe 205 with equal, opposite, and constant contact forces. The displacement sensor measures and feeds back the precise distance between the two crossbars in real time. Once a deviation is detected, the system immediately generates a correction command, driving the sliding clamp 301 integrated under the load-bearing platform 102 and the flexibly clamped measuring pipe 205 to perform an extremely small vertical lifting motion. This motion is closed-loop and iterative, with continuous feedback from the displacement sensor, until the difference between the distance between the two inner diameter measuring crossbars 202 and the theoretical centering distance is eliminated and enters the allowable error range. At this point, the axis of the measuring pipe 205 is automatically and precisely adjusted in the vertical direction to coincide with the center line of the hydraulic plate 106.

[0064] Furthermore, during the measurement process, at the fixed end, the inner membrane 304 of the flexible clamp 302 of the sliding clamp 301 is kept under a constant pressure and expands. The uniformly distributed radial clamping force generated by this pressure provides the maximum static friction force required to prevent macroscopic slippage of the measuring pipe 205. However, since both the clamp body and the expanding membrane 304 are elastic, the wall of the measuring pipe 205 is allowed to freely undergo compressive deformation under the pressure of the hydraulic plate 106, without hindering deformation or causing stress concentration due to localized hard contact, as is the case with rigid clamps. At the measuring end, the current control mode of the electromagnet 307 is switched to "measurement follow mode." Throughout the pressurization process, the displacement sensor continuously and rapidly acquires the deformation of the inner diameter of the measuring pipe 205. The control algorithm dynamically and incrementally adjusts the current of the electromagnet 307 according to the deformation rate and displacement. For example, in the initial stage of rapid deformation, the current can be slightly reduced to decrease the magnetic force, thereby weakening the backing force of the limit spring 204 on the pipe wall through the crossbar, reducing the interference of the measuring mechanism 2 itself on the deformation process. When the deformation tends to stabilize, the current is appropriately increased to maintain sufficient contact force and ensure stable measurement signal. Through this dynamic adjustment, the contact force of the inner diameter measuring crossbar 202 on the pipe wall is always maintained in a balanced state that ensures close contact and reliable measurement while minimizing interference with the natural deformation of the measuring pipe 205. This coordination between the fixed end and the measuring end jointly ensures the high fidelity of the test results.

[0065] Example 3

[0066] The present invention also provides a testing method for a pipeline pressure testing device, comprising the following steps:

[0067] S1. Control the measuring support rod 104 to slide longitudinally down within the gantry bracket 101, driving the longitudinal connecting rod 201 and the inner diameter measuring unit installed on it into the measuring pipe 205 until the inner diameter measuring unit maintains contact with the inner wall of the measuring pipe 205 under the pre-tightening force of the limit spring 204, thus forming a preliminary positioning of the measuring pipe 205.

[0068] S2. Real-time detection of whether the measuring pipe 205 is tilted is performed using the measuring mechanism 2, and fine-tuning of the measuring pipe 205 is performed using the adjustment component 3 until the data of the measuring mechanism 2 is within the normal threshold.

[0069] S3. The hydraulic plate 106 is driven to move downward by the hydraulic push rod 105 to apply pressure to the outer wall of the pipe. At the same time, the deformation data of the pipe under pressure is monitored and obtained by the inner diameter measuring unit. Based on the deformation data monitored by the inner diameter measuring unit, the pressure application and release of the hydraulic push rod 105 are controlled to complete the test cycle.

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipe pressure resistance testing device, comprising a support mechanism (1), a measuring mechanism (2), and an adjustment component (3), wherein the measuring mechanism (2) is located inside the support mechanism (1), and the adjustment component (3) is located on one side of the measuring mechanism (2), characterized in that: The support mechanism (1) includes a gantry bracket (101), a load-bearing platform (102) is provided at the bottom of the gantry bracket (101), and a measuring support rod (104) is slidably provided in the middle of the gantry bracket (101). The left and right sides of the measuring support rod (104) are slidably connected to the left and right sides of the inner wall of the gantry bracket (101). The measuring support rod (104) is equipped with a hydraulic push rod (105) inside, and the output end of the hydraulic push rod (105) is equipped with a hydraulic plate (106). The hydraulic plate (106) is vertically arranged inside the gantry bracket (101). The measuring mechanism (2) includes a longitudinal connecting rod (201), the top of which is movably disposed at the bottom of the measuring support rod (104). The longitudinal connecting rod (201) is perpendicular to the measuring support rod (104). A limiting ring (203) is provided at the end of the longitudinal connecting rod (201) away from the measuring support rod (104). The limiting ring (203) is fixedly disposed on the outside of the bottom end of the longitudinal connecting rod (201). A limiting spring (204) is provided above the limiting ring (203). The limiting spring (204) passes through the longitudinal connecting rod (201) and is located at the top of the limiting ring (203). An inner diameter measuring unit is snapped onto the outer surface of the longitudinal connecting rod (201). The measuring mechanism (2) also includes a measuring pipe (205). The adjustment component (3) includes a sliding groove, and the sliding groove is located on the surface of the load-bearing platform (102). A linear drive device (108) is provided inside the sliding groove. A sliding block is provided at the output end of the linear drive device (108). The outer surface of the sliding block is slidably connected to the inside of the sliding groove. The top of the sliding block is connected to the sliding clamp (301). The linear drive device (108), sliding block, and sliding clamp (301) are each at least two in number, and the two linear drive devices (108), sliding blocks, and sliding clamps (301) are symmetrically arranged on the surface of the load-bearing platform (102). The two symmetrically arranged linear drive devices (108) can drive the two sliding blocks to move closer or further apart along the interior of the sliding groove. The linear drive device (108) can clamp and position the surface of the measuring pipe (205) through the sliding clamp (301). The interior of the sliding clamp (301) includes a flexible clamping plate (302) and a piston mechanism. The piston mechanism consists of a miniature push rod (303) and a piston plate ( Composed of 305), the flexible clamp (302) is located inside the sliding clamp (301), and one side of the flexible clamp (302) is hinged to one side of the inner wall of the sliding clamp (301). The other side of the flexible clamp (302) is movably connected to the sliding plate (308) through the shrink band (306), and the shrink band (306) sequentially covers the flexible clamp (302) and the sliding clamp (301). The interior of the flexible clamp (302) and the sliding clamp (301) are connected by the shrink band (306) to form an accommodating space. The surface of the flexible clamp (302) is provided with multiple through holes, and each through hole is provided with a mutually compatible thin film (304).

2. The pipeline pressure testing device according to claim 1, characterized in that: The inner diameter measuring unit includes two inner diameter measuring crossbars (202) and a displacement sensor. The displacement sensor is equipped with a pre-tensioned steel wire, which is located between the two inner diameter measuring crossbars (202). One end of the inner diameter measuring crossbar (202) is movably connected to the outer surface of the longitudinal connecting rod (201), and the end of the inner diameter measuring crossbar (202) near the longitudinal connecting rod (201) is in contact with the end of the limiting spring (204). The limiting spring (204) can cooperate with the limiting ring (203) to limit the end of the inner diameter measuring crossbar (202).

3. The pipeline pressure testing device according to claim 2, characterized in that: The measuring mechanism (2) also includes a second longitudinal link (208), which is located at the top of the load-bearing platform (102). The end of the second longitudinal link (208) away from the load-bearing platform (102) is provided with a second limiting ring (206), and the top of the second limiting ring (206) is provided with a second limiting spring (207). The second limiting spring (207) is sleeved on the outer surface of the second longitudinal link (208), and the outer surface of the second longitudinal link (208) is movably connected to another inner diameter measuring crossbar (202).

4. The pipeline pressure testing device according to claim 3, characterized in that: The two ends of the limiting spring two (207) are in contact with the ends of the limiting ring two (206) and the inner diameter measuring crossbar (202), respectively. The limiting spring two (207) limits the end of the inner diameter measuring crossbar (202) through the limiting ring two (206). The outer surfaces of the two inner diameter measuring crossbars (202) are located at the top and bottom of the inner wall of the measuring pipe (205), respectively. The outer surfaces of the two inner diameter measuring crossbars (202) are in close contact with the inner diameter surface of the measuring pipe (205).

5. The pipeline pressure resistance testing device according to claim 1, characterized in that: The piston mechanism is located inside the sliding clamp (301). The micro push rod (303) is fixedly installed on the side of the inner wall of the sliding clamp (301) away from the flexible clamp (302). The end of the micro push rod (303) near the flexible clamp (302) is fixedly connected to the side of the piston plate (305). The four sides of the piston plate (305) are in close contact with the four sides of the inner wall of the sliding clamp (301). The micro push rod (303) can control the piston plate (305) to slide inside the sliding clamp (301). The piston plate (305), together with the flexible clamp (302) and the connecting belt, forms a sealed space inside the sliding clamp (301). The side of the inner wall of the sliding clamp (301) near the micro push rod (303) is provided with an air inlet.

6. The pipeline pressure resistance testing device according to claim 5, characterized in that: When the micro push rod (303) is in the extended state, the piston plate (305) moves along the inner wall of the sliding clamp (301) toward the flexible clamp (302), and external gas enters the area between the piston plate (305) and the micro push rod (303). The area between the piston plate (305) and the micro push rod (303) is always in a positive pressure balance state. The flexible clamp (302) deflects away from the piston plate (305) along one side of the sliding clamp (301), and the air pressure between the piston plate (305) and the flexible clamp (302) gradually increases. When the micro push rod (303) is in a fully extended state, the piston plate (305) moves along the inner wall of the sliding clamp (301) toward the flexible clamp (302). The area between the piston plate (305) and the micro push rod (303) draws external gas into the interior, and the area between the piston plate (305) and the micro push rod (303) is always in a positive pressure balance state. The flexible clamp (302) deflects to the maximum angle away from the piston plate (305) along one side of the sliding clamp (301). The air pressure between the piston plate (305) and the flexible clamp (302) gradually increases, and the multiple films (304) on the flexible clamp (302) are in an expanded state. The adjustment assembly (3) further includes an electromagnet (307) and a sliding plate (308). The number of electromagnets (307) and sliding plates (308) is set to multiple. Each electromagnet (307) is located on one side of the first limiting ring (203) and the second limiting ring (206). Each sliding plate (308) is sleeved on the outer surface of the first longitudinal connecting rod (201) and the second longitudinal connecting rod (208). One side of each sliding plate (308) is connected to one end of the first limiting spring (204) and the second limiting spring (207). The electromagnet (307) can drive the sliding plate (308) to move longitudinally.

7. A testing method for a pipeline pressure testing device, implemented using the pipeline pressure testing device as described in claim 1, characterized in that, Includes the following steps: S1. Control the measuring support rod (104) to slide down longitudinally within the gantry bracket (101), driving the longitudinal connecting rod (201) and the inner diameter measuring unit installed thereon into the measuring pipe (205) until the inner diameter measuring unit maintains contact with the inner wall of the measuring pipe (205) under the pre-tightening force of the limiting spring (204), forming a preliminary positioning of the measuring pipe (205); S2. Real-time use of measuring mechanism (2) to detect whether the measuring pipe (205) is tilted, and use adjustment component (3) to finely adjust and center the measuring pipe (205) until the data of measuring mechanism (2) is within the normal threshold. S3. The hydraulic plate (106) is driven to move downward by the hydraulic push rod (105) to apply pressure to the outer wall of the pipe. At the same time, the deformation data of the pipe under pressure is monitored and obtained by the inner diameter measuring unit. Based on the deformation data monitored by the inner diameter measuring unit, the pressure application and release of the hydraulic push rod (105) are controlled to complete the test cycle.

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