A comprehensive performance testing device for welded steel pipes

Abstract

This invention belongs to the field of welded steel pipe production technology, specifically relating to a comprehensive performance testing device for welded steel pipes. The device includes a moving clamping assembly, a fixed clamping assembly, a pressure testing assembly, and a controller. The moving and fixed clamping assemblies are arranged side-by-side, jointly clamping the steel pipe and rotating it. The fixed clamping assembly can inject water into the steel pipe. The pressure testing assembly is located above the clamping station and performs tests on the steel pipe's unloaded outer roundness, unloaded pressure resistance, water-injected airtightness, and water hammer resistance. Both the moving and fixed clamping assemblies use bidirectional clamps to achieve bidirectional clamping of the steel pipe from both inside and outside, adapting to steel pipes of different lengths and specifications. The pressure testing assembly simulates water hammer conditions using a hammer, and simultaneously collects key parameters using pressure sensors and distance sensors. This device integrates multiple testing functions, simplifies the testing process, improves testing accuracy and efficiency, reduces equipment investment, is suitable for large-scale production, can effectively screen qualified products, and reduces safety hazards during use.

Description

Technical Field

[0001] This invention belongs to the field of welded steel pipe production technology, and specifically relates to a comprehensive performance testing device for welded steel pipes. Background Technology

[0002] Welded steel pipes are widely used in water conservancy and other fields, with a large amount used for water transport. During water transport, external factors such as valve opening and closing, and pump start-up and shutdown can cause sudden changes in water flow velocity, leading to water hammer. The water flow inside the pipe instantly impacts the inner wall, creating a vacuum zone within the pipe. External atmospheric pressure acts on the outer wall of the pipe. If the steel pipe's compressive strength is insufficient, deformation, weld cracking, and leakage can easily occur, affecting system operation and causing safety hazards and economic losses. According to industry standards, welded steel pipes must undergo compressive strength testing before leaving the factory to ensure no deformation or leakage within the specified pressure range. Existing compressive strength testing devices mostly use single-point pressure application, which cannot simulate the real scenario of uniform stress on the inner and outer walls of the steel pipe during water hammer. This results in large deviations and low accuracy in test results, making it difficult to screen out unqualified products. Furthermore, it cannot simultaneously collect key parameters such as pressure peak and deformation, affecting the comprehensiveness of the test.

[0003] Roundness is a core geometric indicator of welded steel pipes, directly affecting connection accuracy, conveying efficiency, and installation adaptability. Roundness deviations can lead to welding defects, increased fluid resistance, and increased energy consumption. Furthermore, under water hammer, uneven stress can cause stress concentration, accelerating pipe damage. Current roundness testing methods include manual measurement and specialized equipment testing. Manual measurement is inefficient, labor-intensive, and prone to errors, and cannot achieve continuous testing along the entire length of the pipe. Specialized equipment is either structurally complex and cumbersome to operate, or has poor adaptability and cannot be integrated with pressure testing, resulting in a cumbersome testing process and increased costs.

[0004] In view of this, the inventors aim to provide a comprehensive performance testing device for welded steel pipes, which can meet the requirements of outer roundness testing and pressure resistance testing of steel pipe workpieces under no-load conditions, as well as air tightness testing and water hammer resistance testing under water-filled conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome at least one of the above-mentioned problems in the prior art and to provide a comprehensive performance testing device for welded steel pipes.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: This invention provides a comprehensive performance testing device for welded steel pipes, comprising a dynamic clamping assembly, a fixed clamping assembly, and a pressure testing assembly; The moving clamping assembly and the fixed clamping assembly are arranged side by side at the clamping station, and are used together to clamp the steel pipe workpiece and drive it to rotate around its own axis. The fixed clamping assembly can inject water into the clamped steel pipe workpiece. The pressure testing component is located above the clamping station and is used to test the outer roundness and pressure resistance of the clamped steel pipe workpiece under no-load conditions, as well as the airtightness and water hammer resistance under water-filled conditions.

[0007] Furthermore, the moving clamping assembly includes a first linear guide pair, a sliding pair, a moving block, and a bidirectional clamp. The sliding blocks of the first linear guide pair and the sliding pair jointly support the moving block. The moving block contains a bidirectional clamp that restricts rotation. The bidirectional clamp includes a dome, an outer limiting ring, a cover, radial groove plates, an outer clamping block, an inner clamping block, a bidirectional drive mechanism, and a core tube. The dome has an outer limiting ring on its outer side, and a cover is fixed at the opening of the dome. Multiple radial groove plates are installed circumferentially in the inner cavity of the dome. The outer and inner clamping blocks are alternately sliding and restricting in the radial groove plates. A core tube is installed through the center of the dome. A bidirectional drive mechanism is installed around the core tube in the dome. The bidirectional drive mechanism can drive each outer clamping block to move radially inward / outward, and simultaneously drive each inner clamping block to move outward / inward, thereby locking / unlocking the steel pipe workpiece.

[0008] Furthermore, a pressure sensor is embedded in the core tube of the internal bidirectional gripper of the moving clamping assembly.

[0009] Furthermore, the bidirectional drive mechanism includes a first rotary driver, an end face gear, a first lead screw, a second lead screw, and a bevel gear. The fixed ring of the first rotary driver is installed on the inner wall of the bottom plate of the dome. The end face gear is installed on the outer side of the moving ring of the first rotary driver. The first lead screw and the second lead screw are staggered in the circumferential direction and have opposite directions of rotation. The first lead screw is installed at the radial groove plate where the outer clamping block is located, and the second lead screw is installed at the radial groove plate where the inner clamping block is located. The inner ends of the first lead screw and the second lead screw are each equipped with a bevel gear that meshes with the end face gear.

[0010] Furthermore, the moving block is provided with an anti-detachment groove to facilitate the rotation of the dome and the outer limiting ring. The cover is provided with multiple radial sliding grooves along the circumference to facilitate the exposure of the outer clamping block or the inner clamping block. The radial sliding grooves are connected to the inner cavity of the corresponding radial groove plate. The outer clamping block is provided with a first screw groove that mates with the first screw inside the dome. The inner side of the block outside the cover is provided with an outer clamping arc groove that mates with the outer surface of the steel pipe workpiece. The inner clamping block is provided with a second screw groove that mates with the second screw inside the dome. The outer side of the block outside the cover is provided with an inner clamping arc groove that mates with the inner surface of the steel pipe workpiece. The dome, the radial groove plate, and the cover together form a waterproof sealing area. The web of the radial groove plate is provided with a shaft seal at the point where the smooth section of the first or second screw passes through.

[0011] Furthermore, the fixed clamping assembly includes a base plate and a fixed load block and a water tank mounted thereon. The fixed load block also has a bidirectional clamping device inside for rotational restriction. A flip drive motor is mounted on the outside of the fixed load block. The output end of the flip drive motor is connected to a worm gear that extends into the fixed load block. The bidirectional clamping device inside the fixed load block has worm wheel grooves that cooperate with the worm gear evenly distributed on the outer periphery of the outer limiting ring. The bidirectional clamping device inside the fixed load block is located at the tail end of the core tube and is connected to one end of the water pipe via a liquid guiding slip ring. The other end of the water pipe is connected to a water pump. The water pump is located inside the water tank and has both pumping and draining functions.

[0012] Furthermore, the pressure detection assembly includes a second linear guide pair, a first mounting plate, a second rotary driver, a second mounting plate, a cross-shaped slide box, a first baffle, a first locking rod block, a pressure resistance detection hammer, a second baffle, a second locking rod block, a water hammer resistance detection hammer, a support plate, and a distance sensor; the slider of the second linear guide pair is mounted with the second rotary driver via the first mounting plate, and the moving ring of the second rotary driver is mounted with the cross-shaped slide box via the second mounting plate. The cross-shaped slide box includes a first slide box portion and a second slide box portion that intersect perpendicularly. The first sliding box has a pressure-resistant testing hammer slidingly restricted in its inner cavity. First baffles are fastened to both ends of the first sliding box by fasteners. A first locking block for locking the pressure-resistant testing hammer is installed on the inner side of the first baffle. The second sliding box has a water-hammer-resistant testing hammer slidingly restricted in its inner cavity. Second baffles are fastened to both ends of the second sliding box by fasteners. A second locking block for locking the water-hammer-resistant testing hammer is installed on the inner side of the second baffle. The ranging sensor is mounted between the first and second sliding boxes via a support plate.

[0013] Furthermore, the pressure resistance test hammer and the water hammer test hammer each include a hammer block, a guide block, and a hammer rod. The guide block is located on the back side of the hammer block, and there are two hammer rods, which are symmetrically threaded on the upper and lower sides of the hammer block. The cross-shaped slide box has a guide groove that cooperates with the guide block on the inner side of the first slide box part and the second slide box part.

[0014] Furthermore, the first baffle and the second baffle are each in the form of a grooved plate. The web of the grooved plate is provided with a clearance hammer hole that cooperates with the hammer rod. The two side plates of the grooved plate are symmetrically provided with fastening through holes that cooperate with fasteners. The outer ends of the cross-shaped slide box located in the first slide box part and the second slide box part are provided with fastening screw holes that cooperate with fasteners.

[0015] Furthermore, the first locking rod block and the second locking rod block each include a locking block. The locking block has a rod-passing channel inside that cooperates with the hammer rod. The locking block has an annular adsorption cavity at the periphery of the rod-passing channel. A plurality of adsorption holes are evenly distributed between the rod-passing channel and the annular adsorption cavity. A vacuum pump for drawing air into the annular adsorption cavity is installed in the locking block.

[0016] Furthermore, it also includes a controller, which is connected to the moving clamping assembly, the stationary clamping assembly, and the pressure detection assembly, respectively.

[0017] The beneficial effects of this invention are: 1. This device integrates four major functions: no-load outer roundness detection, no-load pressure resistance performance detection, water injection air tightness detection, and water injection anti-water hammer performance detection. It eliminates the need to change testing equipment or transfer steel pipe workpieces, completely solving the pain points of the separation of pressure resistance testing and roundness testing and the cumbersome testing process in the existing technology. It is suitable for the high-efficiency testing needs of large-scale production, effectively reducing equipment investment and manual operation costs, and improving the continuity and efficiency of the testing line.

[0018] 2. To address the shortcomings of existing pressure resistance testing methods that apply pressure at a single point and cannot simulate the real-world conditions of water hammer, this device utilizes the coordinated operation of the water hammer testing hammer and the pressure resistance testing hammer in the pressure testing component, combined with the water injection function of the fixed clamping component. This allows for accurate simulation of the real-world scenario where the inner and outer walls of the steel pipe are uniformly stressed during a water hammer event. Simultaneously, by employing the pressure sensor within the core tube of the moving clamping component, key parameters such as peak pressure, internal pressure changes, and deformation are collected synchronously. This avoids deviations in test results, ensures accurate screening of qualified products, and reduces safety hazards and economic losses during the subsequent use of the steel pipe.

[0019] 3. Both the moving and fixed clamping components adopt bidirectional clamps. The bidirectional drive mechanism synchronously drives the outer clamping block and the inner clamping block to move in opposite directions, realizing bidirectional clamping of the steel pipe workpiece. The clamping is firm and the force is even, effectively preventing the steel pipe from shifting or loosening during the inspection process. At the same time, the moving clamping component can be flexibly adjusted in position through the first linear guide pair and the moving pair to adapt to welded steel pipes of different lengths and specifications. There is no need to replace the clamping components, so it has a wide range of adaptability and strong versatility.

[0020] 4. The bidirectional clamp is formed by a circular cover, radial groove plate, and cover to create a waterproof sealing area. With the shaft seal at the web of the radial groove plate, it can effectively isolate moisture during water injection testing, prevent internal drive components from being damaged by moisture, and extend the service life of the device. The core tube of the fixed clamping component is connected to the water pipe through a liquid guide slip ring, which not only solves the problem of water pipe entanglement when the steel pipe rotates, but also achieves fast and stable water injection. At the same time, the water pump has bidirectional pumping and drainage functions, realizing water resource recycling and saving testing costs.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the moving clamping assembly in this invention; Figure 3 This is a schematic diagram of the composition of the bidirectional clamp in this invention; Figure 4 This is a schematic diagram of the bidirectional drive mechanism in this invention; Figure 5 This is a schematic diagram of the fixed clamping component in the present invention; Figure 6 This is a schematic diagram of the internal structure of the fixed-load block in this invention; Figure 7 This is a front view schematic diagram of the fixed load block in this invention; Figure 8 This is a schematic diagram of the pressure detection component in this invention; Figure 9 This is an exploded view of the pressure detection component in this invention; Figure 10 This is a schematic diagram of the cross-shaped sliding box and its upper component after separation in this invention; Figure 11 This is a schematic diagram of the cross-shaped sliding box in this invention; Figure 12 This is a schematic diagram of the pressure resistance testing hammer in this invention; Figure 13 This is a schematic diagram of the structure of the first baffle in this invention; Figure 14 This is a schematic diagram of the structure of the first locking rod block in this invention; In the attached diagram, the components represented by each number are as follows: 1-Moving clamping assembly, 101-First linear guide pair, 102-Moving pair, 103-Moving block, 104-Circular cover, 105-Outer limiting ring, 106-Cover, 107-Anti-detachment groove, 108-Radial groove plate, 109-Outer clamping block, 110-Inner clamping block, 111-Bidirectional drive mechanism, 111a-First rotary driver, 111b-End face gear, 111c-First lead screw, 111d-Second lead screw, 111e-Bevel gear, 112-Core tube, 113-Radial slide groove, 115-Pressure sensor; 2-Fixed clamping assembly, 201-Base plate, 202-Water tank, 203-Fixed load block, 204-Tilting drive motor, 205-Worm gear, 206-Worm wheel groove, 207-Liquid guiding slip ring, 208-Water pipe; 3-Pressure testing component, 301-Second linear guide pair, 302-First mounting plate, 303-Second rotary drive, 304-Second mounting plate, 305-Cross-shaped slide box, 305a-First slide box part, 305b-Second slide box part, 305c-Guide slide groove, 306-First baffle, 306a-Avoidance hammer hole, 306b-Fastening through hole, 307-First locking rod block, 307a-Pole passage, 307b-Annular adsorption chamber, 307c-Adsorption hole, 307d-Vacuum pump, 308-Pressure resistance testing hammer, 308a-Hammer block, 308b-Guide block, 308c-Hammer rod, 309-Second baffle, 310-Second locking rod block, 311-Water hammer resistance testing hammer, 312-Support plate, 313-Distance sensor; 4-Steel pipe workpiece. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, this embodiment provides a comprehensive performance testing device for welded steel pipes, including a movable clamping assembly 1, a fixed clamping assembly 2, and a pressure testing assembly 3. The movable clamping assembly 1 and the fixed clamping assembly 2 are arranged side by side at the clamping station and are used together to clamp the steel pipe workpiece 4 and drive it to rotate around its own axis. The fixed clamping assembly 2 can inject water into the clamped steel pipe workpiece 4. The pressure testing assembly 3 is arranged above the clamping station and is used to perform external roundness testing and pressure resistance testing on the clamped steel pipe workpiece 4 under no-load conditions, as well as air tightness testing and water hammer resistance testing under water-filled conditions.

[0026] like Figures 2-3As shown, the moving clamping assembly 1 includes a first linear guide pair 101, a sliding pair 102, a moving block 103, and a bidirectional clamp. The sliding blocks of the first linear guide pair 101 and the sliding pair 102 jointly support the moving block 103, and the bidirectional clamp restricts rotation within the moving block 103. The bidirectional clamp includes a dome 104, an outer limiting ring 105, a cover 106, radial groove plates 108, an outer clamping block 109, an inner clamping block 110, a bidirectional drive mechanism 111, and a core tube 112. The outer limiting ring 105 is provided on the outer side of the dome 104, and the cover 106 is fixed at the opening of the dome 104. Multiple radial groove plates 108 are installed circumferentially in the inner cavity of the dome 104, and the outer clamping block 109 and the inner clamping block 110 are alternately slidably restricted within the radial groove plates 108. A core tube 112 is installed through the center of the circular cover 104. A bidirectional drive mechanism 111 is installed around the core tube 112. The bidirectional drive mechanism 111 can drive each outer clamping block 109 to move radially inward / outward, and at the same time drive each inner clamping block 110 to move outward / inward, thereby locking / unlocking the steel pipe workpiece 4.

[0027] In this embodiment, a pressure sensor 115 is embedded in the core tube 112 of the internal bidirectional clamping device of the moving clamping assembly 1.

[0028] like Figure 4 As shown, the bidirectional drive mechanism 111 includes a first rotary drive 111a, an end face gear 111b, a first lead screw 111c, a second lead screw 111d, and a bevel gear 111e. The fixed ring of the first rotary drive 111a is installed on the inner wall of the bottom plate of the circular cover 104. The end face gear 111b is installed on the outer side of the moving ring of the first rotary drive 111a. The first lead screw 111c and the second lead screw 111d are staggered in the circumferential direction and their rotation directions are opposite. The first lead screw 111c is installed at the radial groove plate 108 where the outer clamping block 109 is located. The second lead screw 111d is installed at the radial groove plate 108 where the inner clamping block 110 is located. The inner ends of the first lead screw 111c and the second lead screw 111d are each equipped with a bevel gear 111e that meshes with the end face gear 111b.

[0029] In this embodiment, the moving block 103 is provided with an anti-detachment groove 107 to facilitate the rotation of the dome 104 and the outer limiting ring 105. The cover 106 is provided with a plurality of radial sliding grooves 113 along the circumference to facilitate the exposure of the outer clamping block 109 or the inner clamping block 110. The radial sliding grooves 113 are connected to the inner cavity of the corresponding radial groove plate 108. The outer clamping block 109 is provided with a first screw groove that cooperates with the first screw 111c inside the dome 104. The inner side of the block located outside the cover 106 is provided with a groove that cooperates with the first screw 111c. The outer surface of the steel pipe workpiece 4 is fitted with an outer clamping arc groove; the inner clamping block 110 is located inside the circular cover 104 and has a second screw groove that mates with the second screw 111d; the outer side of the block located outside the cover 106 has an inner clamping arc groove that mates with the inner surface of the steel pipe workpiece 4; the circular cover 104, the radial groove plate 108, and the cover 106 together form a waterproof sealing area; the web portion of the radial groove plate 108 is fitted with a shaft seal at the point where the smooth section of the first screw 111c or the second screw 111d passes through.

[0030] The working principle of the moving clamping assembly is as follows: The core function of the moving clamping assembly 1 is to clamp one end of the steel pipe workpiece 4, cooperate with the fixed clamping assembly to drive the steel pipe to rotate, and collect the pressure parameters inside the pipe through a pressure sensor. Its working principle is as follows: the first linear guide pair 101 and the moving pair 102 work together to drive the moving block 103 to move linearly, thereby adjusting the distance between the moving clamping assembly and the fixed clamping assembly to adapt to steel pipe workpieces 4 of different lengths; the anti-detachment groove 107 in the moving block 103 is used to limit the position of the bidirectional clamping device to ensure that the bidirectional clamping device can rotate stably and without deviation.

[0031] The core of the bidirectional clamp is the bidirectional drive mechanism 111: After the first rotary driver 111a starts, its moving ring drives the end face gear 111b to rotate. Since the end face gear 111b meshes with the bevel gear 111e at the inner end of the first lead screw 111c and the second lead screw 111d, and the first lead screw 111c and the second lead screw 111d rotate in opposite directions, the rotation of the end face gear 111b will synchronously drive the first lead screw 111c and the second lead screw 111d to rotate in opposite directions. When the first lead screw 111c rotates, it drives the outer clamping block 109, which cooperates with it, to move inward or outward along the radial groove 113 of the radial groove plate 108. When the second lead screw 111d rotates, it drives the inner clamping block 110, which cooperates with it, to move outward or inward along the radial groove 113 of the radial groove plate 108, thereby realizing the reverse linkage between the outer clamping block 109 and the inner clamping block 110, and thus completing the bidirectional clamping (locking) or releasing (unlocking) of the steel pipe workpiece 4 ends.

[0032] The outer clamping arc groove of the outer clamping block 109 fits against the outer surface of the steel pipe workpiece 4, and the inner clamping arc groove of the inner clamping block 110 fits against the inner surface of the steel pipe workpiece 4, ensuring uniform force during clamping and avoiding damage to the surface of the steel pipe; the waterproof sealing area formed by the circular cover 104, the radial groove plate 108, and the cover 106, together with the shaft seal at the web of the radial groove plate 108, can prevent water from entering the bidirectional clamp during water injection testing, protecting the internal bidirectional drive mechanism 111; the core tube 112 passes through the center of the circular cover 104, providing an installation reference for the bidirectional drive mechanism 111 on the one hand, and embedding the pressure sensor 115 on the other hand, to collect the pressure changes inside the steel pipe workpiece 4 in real time.

[0033] like Figures 5-7 As shown, the fixed clamping assembly 2 includes a base plate 201 and a fixed load block 203 and a water tank 202 mounted thereon. The fixed load block 203 also has a bidirectional clamping device inside, which restricts rotation. A tilting drive motor 204 is mounted on the outside of the fixed load block 203. The output end of the tilting drive motor 204 is connected to a worm gear 205 extending into the fixed load block 203. The bidirectional clamping device inside the fixed load block 203 has worm wheel grooves 206 evenly distributed around the outer periphery of the outer limiting ring, which mate with the worm gear 205. The bidirectional clamping device inside the fixed load block 203 is located at the tail end of the core tube and is connected to one end of a water pipe 208 via a liquid guiding slip ring 207. The other end of the water pipe 208 is connected to a water pump, which is located inside the water tank 202 and has both pumping and draining functions.

[0034] The working principle of the fixed clamping assembly is as follows: The core function of the fixed clamping assembly 2 is to clamp the other end of the steel pipe workpiece 4, drive the steel pipe to rotate around its own axis, and simultaneously inject or drain water into the steel pipe. Its working principle is as follows: the base plate 201 provides mounting support for the fixed load block 203 and the water tank 202. The water tank 202 is used to store the water required for testing. The internal water pump has a two-way function of pumping and draining water, providing power for injecting and draining water into the steel pipe.

[0035] The bidirectional clamp inside the fixed load block 203 has the same structure and working principle as the bidirectional clamp in the moving clamp assembly 1. It is used to cooperate with the bidirectional clamp of the moving clamp assembly to realize the synchronous clamping of both ends of the steel pipe workpiece 4. After the flip drive motor 204 is started, its output end drives the worm 205 to rotate. The worm 205 meshes with the worm wheel groove 206 on the outer circumference of the outer limit ring of the bidirectional clamp, thereby driving the bidirectional clamp to rotate as a whole. Since the bidirectional clamp is clamped and fixed to the steel pipe workpiece 4, it can drive the steel pipe workpiece 4 to rotate around its own axis, providing conditions for the full-length roundness detection and all-round pressure resistance detection of the steel pipe.

[0036] The tail end of the core tube of the bidirectional clamp inside the fixed load block 203 is connected to the water pipe 208 via a liquid guide slip ring 207. The function of the liquid guide slip ring 207 is to solve the problem of water pipe entanglement when the steel pipe rotates, ensuring stable water injection during the rotation of the steel pipe. After the water pump starts, the water in the water tank 202 is injected into the steel pipe workpiece 4 through the water pipe 208, the liquid guide slip ring 207, and the core tube. After the water injection is completed, the water pump stops pumping. After the test is completed, the water pump switches to drainage mode, pumping out the water in the steel pipe and returning it to the water tank 202, realizing the recycling of water resources. In order to facilitate drainage, the inner end of the core tube can be connected to a downward-extending elbow, which is conducive to the pumping out water in the low water level area.

[0037] like Figures 8-11 As shown, the pressure detection assembly 3 includes a second linear guide pair 301, a first mounting plate 302, a second rotary driver 303, a second mounting plate 304, a cross-shaped slide box 305, a first baffle 306, a first locking rod block 307, a pressure resistance detection hammer 308, a second baffle 309, a second locking rod block 310, a water hammer resistance detection hammer 311, a support plate 312, and a distance sensor 313. The slider of the second linear guide pair 301 is mounted with the second rotary driver 303 via the first mounting plate 302, and the moving ring of the second rotary driver 303 is mounted with the cross-shaped slide box 305 via the second mounting plate 304. The cross-shaped sliding box 305 includes a first sliding box portion 305a and a second sliding box portion 305b that intersect perpendicularly. A pressure-resistant detection hammer 308 is slidably restrained within the inner cavity of the first sliding box portion 305a. First baffles 306 are fastened to both ends of the first sliding box portion 305a, and a first locking block 307 for locking the pressure-resistant detection hammer 308 is installed on the inner side of the first baffles 306. A water-hammer-resistant detection hammer 311 is slidably restrained within the inner cavity of the second sliding box portion 305b. Second baffles 309 are fastened to both ends of the second sliding box portion 305b, and a second locking block 310 for locking the water-hammer-resistant detection hammer 311 is installed on the inner side of the second baffles 309. A ranging sensor 313 is mounted between the first sliding box portion 305a and the second sliding box portion 305b via a support plate 312.

[0038] like Figure 12 As shown, the pressure resistance test hammer 308 and the water hammer test hammer 311 each include a hammer block 308a, a guide block 308b, and a hammer rod 308c. The guide block 308b is located on the back side of the hammer block 308a. There are two hammer rods 308c, which are symmetrically threaded onto the upper and lower sides of the hammer block 308a. The cross-shaped slide box 305 is located on the inner side of the first slide box part 305a and the second slide box part 305b, and has a guide groove 305c that mates with the guide block 308b.

[0039] like Figure 13As shown, the first baffle 306 and the second baffle 309 are each in the form of a grooved plate. The web of the grooved plate is provided with a clearance hammer hole 306a that cooperates with the hammer rod 308c. The two side plates of the grooved plate are symmetrically provided with fastening through holes 306b that cooperate with fasteners. The cross-shaped slide box 305 is provided with fastening screw holes that cooperate with fasteners at the outer ends of the first slide box part 305a and the second slide box part 305b.

[0040] like Figure 14 As shown, the first locking rod block 307 and the second locking rod block 310 each include a locking block. The locking block has a rod-passing channel 307a that cooperates with the hammer rod 308c. The locking block has an annular adsorption cavity 307b at the periphery of the rod-passing channel 307a. A plurality of adsorption holes 307c are evenly distributed between the rod-passing channel 307a and the annular adsorption cavity 307b. A vacuum pump 307d for evacuating air into the annular adsorption cavity 307b is installed in the locking block.

[0041] The working principle of the pressure detection component is as follows: The core function of the pressure testing component 3 is to complete the outer roundness test, pressure resistance test, air tightness test, and water hammer resistance test of the steel pipe. Its working principle is as follows: the second linear guide pair 301 drives the first mounting plate 302, the second rotary driver 303, the cross-shaped slide box 305 and other components to move linearly along the axis of the steel pipe workpiece 4; after the second rotary driver 303 is started, its moving ring drives the second mounting plate 304 and the cross-shaped slide box 305 to rotate, and the pressure resistance test hammer 308, the water hammer resistance test hammer 311 and the distance sensor 313 can be switched as needed.

[0042] The first slide box part 305a of the cross-shaped slide box 305 is used to install the pressure resistance test hammer 308, and the second slide box part 305b is used to install the water hammer test hammer 311. The pressure resistance test hammer 308 and the water hammer test hammer 311 have the same structure. They are both slidably engaged with the guide groove 305c of the cross-shaped slide box through the guide block 308b to ensure that the hammer block 308a can move smoothly along the slide box part. The hammer rod 308c is symmetrically threaded on the upper and lower sides of the hammer block 308a and is used to cooperate with the first locking rod block 307 and the second locking rod block 310 to realize the locking and releasing of the hammer.

[0043] The first baffle 306 and the second baffle 309 are fixed to the two ends of the first sliding box 305a and the second sliding box 305b respectively by fasteners. They are used to limit the displacement range of the pressure resistance test hammer 308 and the water hammer test hammer 311 to prevent the hammer from falling off. The working principle of the first locking rod block 307 and the second locking rod block 310 is the same: when it is necessary to lock the hammer, the vacuum pump 307d is started to evacuate the annular adsorption chamber 307b, so that a negative pressure is formed in the annular adsorption chamber 307b. The adsorption force is generated on the hammer rod 308c in the rod channel 307a through the adsorption hole 307c, thereby fixing the hammer rod 308c and realizing the locking of the hammer. When it is necessary to release the hammer, the vacuum pump 307d stops working, the negative pressure in the annular adsorption chamber 307b disappears, the adsorption force is released, and the hammer can move freely along the sliding box.

[0044] The distance sensor 313 is mounted at the center of the cross-shaped sliding box 305 via the support plate 312, and is used to detect the distance between it and the outer surface of the steel pipe workpiece 4 in real time, providing data support for roundness detection and deformation detection.

[0045] In this embodiment, a controller is also included, which is connected to the moving clamping assembly 1, the fixed clamping assembly 2, and the pressure detection assembly 3. The controller coordinates the collaborative work of each assembly: it receives pressure and distance data collected by the pressure sensor 115 and the distance sensor 313, analyzes and processes the data, and determines whether the various performance characteristics of the steel pipe are qualified; it controls the start-up and shutdown of the driving components such as the first linear guide pair 101, the moving pair 102, the flip drive motor 204, the second linear guide pair 301, and the second rotary drive 303, and realizes the automated control of actions such as clamping, rotating, pressurizing, and injecting water into the steel pipe; it controls the start-up and shutdown of the water pump and the vacuum pump 307d to complete the actions of water injection, drainage, and locking / releasing the hammer.

[0046] The principle of outer roundness detection under no-load conditions is as follows: Before testing, the controller controls the moving clamping assembly 1 and the fixed clamping assembly 2 to jointly clamp the steel pipe workpiece 4, ensuring that the steel pipe axis coincides with the rotation axis. Simultaneously, the second rotary drive 303 adjusts the rotation direction of the cross-shaped sliding box, aligning the distance sensor 313 with the outer surface of the steel pipe workpiece 4. The distance sensor 313 collects real-time distance data between itself and the outer surface of the steel pipe and transmits the data to the controller. The second linear guide pair 301 drives the distance sensor 313 to linearly displace. After each measurement, the control of the flip drive motor 204 rotates the steel pipe workpiece 4 around its own axis by a certain angle, allowing for the next measurement. This process continues until straightness measurements at multiple circumferential positions are completed, ultimately determining whether the roundness of the steel pipe meets industry standards.

[0047] The principle of pressure resistance testing under no-load conditions is as follows: Before testing, the steel pipe workpiece 4 is in an unloaded state (no water is injected inside). The controller controls the second rotary drive 303 of the pressure testing component to rotate. First, the distance data of the point to be pressed is collected in advance using the distance sensor 313. Then, the second rotary drive 303 rotates again to make the first sliding box 305a vertical, and the hammer rod 308c of the pressure testing hammer 308 is aligned with the outer surface of the steel pipe. The vacuum pump 307d of the first locking block 307 stops working, releasing the lock on the pressure testing hammer 308. The pressure testing hammer 308 falls along the first sliding box 305a under its own gravity until the hammer rod 308c is in contact with the outer surface of the steel pipe and the preset pressure is applied. The controller controls the second rotary drive 303 of the pressure testing component to rotate, and the distance data of the point to be pressed is collected again using the distance sensor 313. Based on the deformation data, it is determined whether the steel pipe meets the pressure resistance requirements under the preset dynamic load pressure. By rotating the steel pipe and applying pressure to detect the displacement of the testing components, pressure resistance testing can be performed on the entire length of the steel pipe at different locations.

[0048] The principle of airtightness testing under water injection conditions is as follows: Before testing, the controller controls the bidirectional clamps of the moving clamping assembly 1 and the fixed clamping assembly 2 to completely lock both ends of the steel pipe workpiece 4, ensuring the steel pipe is sealed. Subsequently, the controller controls the water pump of the fixed clamping assembly 2 to start, injecting water into the steel pipe until the preset pressure is reached. Then, the water pump stops pumping water and closes the relevant valves, keeping the steel pipe in a sealed and pressure-holding state. During the pressure holding process, the pressure sensor 115 inside the core tube of the moving clamping assembly 1 collects the pressure data inside the pipe in real time and transmits it to the controller. The controller continuously monitors the changes in the pressure inside the pipe. If the pressure inside the pipe remains stable and does not drop significantly within the preset pressure holding time, it indicates that the steel pipe has good airtightness and no leakage. If the pressure inside the pipe drops, it indicates that the steel pipe has airtightness defects such as weld cracks or pipe wall damage.

[0049] The principle for testing water hammer resistance under water injection conditions is as follows: Before testing, the steel pipe is filled with water using the clamping assembly 2, ensuring it is fully submerged. Pressure sensor 115 monitors the initial pressure within the pipe in real time. Subsequently, the controller rotates the second rotary driver 303 of the pressure testing assembly, ensuring the second sliding box 305b is vertical. Simultaneously, the position of the second linear guide 301 is adjusted, positioning the water hammer testing hammer 311 at a preset impact position. During testing, the vacuum pump 307d of the second locking block 310 quickly stops, releasing the lock on the hammer rod 308c. The water hammer testing hammer 311 falls under gravity, simulating the instantaneous impact of atmospheric pressure on the outer wall of the steel pipe during a water hammer event. Simultaneously, the water inside the pipe generates a reverse impact force due to the instantaneous impact, and pressure sensor 115 collects data such as the peak pressure and pressure change curve within the pipe in real time. Distance sensor 313, based on the pressure resistance performance testing principle under no-load conditions, collects data on the deformation of the steel pipe at the pressure point. The controller determines whether the steel pipe meets the actual use requirements under simulated water hammer impact based on the collected pressure peak and deformation data.

[0050] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A comprehensive performance testing device for welded steel pipes, characterized in that, Includes a moving clamping assembly, a fixed clamping assembly, and a pressure detection assembly; The moving clamping assembly and the fixed clamping assembly are arranged side by side at the clamping station, and are used together to clamp the steel pipe workpiece and drive it to rotate around its own axis. The fixed clamping assembly can inject water into the clamped steel pipe workpiece. The pressure testing component is located above the clamping station and is used to test the outer roundness and pressure resistance of the clamped steel pipe workpiece under no-load conditions, as well as the airtightness and water hammer resistance under water-filled conditions.

2. The comprehensive performance testing device for welded steel pipes according to claim 1, characterized in that, The moving clamping assembly includes a first linear guide pair, a sliding pair, a moving block, and a bidirectional clamp. The sliding blocks of the first linear guide pair and the sliding pair jointly support the moving block. The moving block contains a bidirectional clamp that restricts rotation. The bidirectional clamp includes a dome, an outer limiting ring, a cover, radial groove plates, an outer clamping block, an inner clamping block, a bidirectional drive mechanism, and a core tube. The dome has an outer limiting ring on its outer side, and a cover is fixed at the opening of the dome. Multiple radial groove plates are installed circumferentially in the inner cavity of the dome. The outer and inner clamping blocks are alternately sliding and restricting in the radial groove plates. A core tube is installed through the center of the dome. A bidirectional drive mechanism is installed around the core tube in the dome. The bidirectional drive mechanism can drive each outer clamping block to move radially inward / outward, and simultaneously drive each inner clamping block to move outward / inward, thereby locking / unlocking the steel pipe workpiece.

3. The comprehensive performance testing device for welded steel pipes according to claim 2, characterized in that, The moving clamping assembly has a pressure sensor embedded in the core tube of the internal bidirectional clamp.

4. The comprehensive performance testing device for welded steel pipes according to claim 3, characterized in that, The bidirectional drive mechanism includes a first rotary driver, an end face gear, a first lead screw, a second lead screw, and a bevel gear. The fixed ring of the first rotary driver is installed on the inner wall of the bottom plate of the dome. The end face gear is installed on the outer side of the moving ring of the first rotary driver. The first lead screw and the second lead screw are staggered in the circumferential direction and have opposite directions of rotation. The first lead screw is installed at the radial groove plate where the outer clamping block is located, and the second lead screw is installed at the radial groove plate where the inner clamping block is located. The inner ends of the first lead screw and the second lead screw are each equipped with a bevel gear that meshes with the end face gear.

5. The comprehensive performance testing device for welded steel pipes according to claim 4, characterized in that, The moving block has an anti-detachment groove to facilitate the rotation of the dome and the outer limiting ring. The cover has multiple radial grooves along its circumference to facilitate the exposure of the outer or inner clamping block. The radial grooves are connected to the inner cavities of the corresponding radial groove plates. The outer clamping block has a first screw groove inside the dome that mates with the first screw, and an outer clamping arc groove that mates with the outer surface of the steel pipe workpiece is located on the inner side of the block outside the cover. The inner clamping block has a second screw groove inside the dome that mates with the second screw, and an inner clamping arc groove that mates with the inner surface of the steel pipe workpiece is located on the outer side of the block outside the cover. The dome, radial groove plates, and cover together form a waterproof sealing area. A shaft seal is installed on the web of the radial groove plate at the point where the smooth section of the first or second screw passes through.

6. The comprehensive performance testing device for welded steel pipes according to claim 5, characterized in that, The fixed clamping assembly includes a base plate and a fixed load block and a water tank mounted thereon. The fixed load block also has a bidirectional clamp that restricts rotation. A flip drive motor is mounted on the outside of the fixed load block. The output end of the flip drive motor is connected to a worm gear that extends into the fixed load block. The bidirectional clamp inside the fixed load block has worm wheel grooves that cooperate with the worm gear evenly distributed on the outer periphery of the outer limiting ring. The bidirectional clamp inside the fixed load block is located at the tail end of the core tube and is connected to one end of the water pipe via a liquid guiding slip ring. The other end of the water pipe is connected to a water pump. The water pump is located inside the water tank and has both pumping and draining functions.

7. The comprehensive performance testing device for welded steel pipes according to claim 6, characterized in that, The pressure detection assembly includes a second linear guide pair, a first mounting plate, a second rotary driver, a second mounting plate, a cross-shaped slide box, a first baffle, a first locking rod block, a pressure-resistant detection hammer, a second baffle, a second locking rod block, a water hammer-resistant detection hammer, a support plate, and a distance sensor. The slider of the second linear guide pair is mounted with the second rotary driver via the first mounting plate. The moving ring of the second rotary driver is mounted with the cross-shaped slide box via the second mounting plate. The cross-shaped slide box includes a first slide box section and a second slide box section that intersect perpendicularly. A pressure-resistant detection hammer is slidably restricted within the inner cavity of the first slide box section. First baffles are mounted at both ends of the first slide box section via fasteners. A first locking rod block for locking the pressure-resistant detection hammer is mounted on the inner side of the first baffle. A water hammer-resistant detection hammer is slidably restricted within the inner cavity of the second slide box section. Second baffles are mounted at both ends of the second slide box section via fasteners. A second locking rod block for locking the water hammer-resistant detection hammer is mounted on the inner side of the second baffle. The distance sensor is mounted between the first and second slide box sections via a support plate.

8. The comprehensive performance testing device for welded steel pipes according to claim 7, characterized in that, The pressure resistance test hammer and the water hammer test hammer each include a hammer block, a guide block and a hammer rod. The guide block is located on the back side of the hammer block. There are two hammer rods, which are symmetrically threaded on the upper and lower sides of the hammer block. The cross-shaped slide box has a guide groove that cooperates with the guide block on the inner side of the first slide box part and the second slide box part.

9. The comprehensive performance testing device for welded steel pipes according to claim 8, characterized in that, The first baffle and the second baffle are each in the form of a grooved plate. The web of the grooved plate is provided with a clearance hammer hole that cooperates with the hammer rod. The two side plates of the grooved plate are symmetrically provided with fastening through holes that cooperate with fasteners. The outer ends of the cross-shaped slide box located in the first slide box part and the second slide box part are provided with fastening screw holes that cooperate with fasteners.

10. The comprehensive performance testing device for welded steel pipes according to claim 9, characterized in that, The first locking rod block and the second locking rod block each include a locking block. The locking block has a rod-passing channel inside that cooperates with the hammer rod. The locking block has an annular adsorption cavity at the periphery of the rod-passing channel. A plurality of adsorption holes are evenly distributed between the rod-passing channel and the annular adsorption cavity. A vacuum pump for drawing air into the annular adsorption cavity is installed in the locking block.

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