Compressive strength detection equipment for gas pipeline

Abstract

The invention belongs to the technical field of gas pipeline detection, and discloses gas pipeline compressive strength detection equipment which comprises a main body box and a detection box fixedly arranged on the inner wall of the bottom of the main body box, and a strength detection assembly and a hydraulic control assembly are arranged in the main body box. The strength detection assembly comprises a fixing frame fixedly arranged on the bottom wall of the main body box, a two-way screw with the middle rotationally arranged in the fixing frame and a guide rod with the middle horizontally and fixedly arranged in the fixing frame, and the change of air pressure in an air pressure piston cylinder is controlled by activating a servo motor in the forward direction and the reverse direction; the pressure-resistant and tear-resistant performance test is carried out on the gas pipeline by utilizing the force generated by the gas pressure gradient, in the process, the internal volume of the hydraulic piston cylinder is correspondingly changed due to the compression and release of the gas pressure, and the compressive strength and tear-resistant strength indexes of the gas pipeline are calculated by accurately monitoring the increase and decrease of the volume of the liquid in the observation cylinder.

Description

Technical Field

[0001] The invention belongs to the technical field of gas pipeline detection, and in particular relates to a gas pipeline compressive strength detection device. Background Art

[0002] With the acceleration of urbanization, the gas supply system has become an important part of modern urban infrastructure. However, due to the aging and corrosion of gas pipelines and the invasion of the external environment, gas leakage accidents occur from time to time. In order to ensure the safe operation of gas pipelines, gas pipelines need to be inspected and maintained regularly.

[0003] At present, there are some common problems with gas pipeline detection equipment on the market: 1. Existing detection equipment is only applicable to gas pipelines of specific types or diameters, resulting in limitations in practical applications; 2. Existing testing equipment is often complicated to operate, and each step requires professional personnel to operate, which increases the risk of misoperation; 3. Existing testing equipment cannot intuitively calculate strength index data and cannot provide real-time and accurate analysis results; 4. Existing testing equipment can only perform a single type of test on the pipeline to be tested and cannot evaluate the mechanical properties of the pipeline from multiple angles.

[0004] Therefore, a gas pipeline compressive strength testing device with a wide range of applications, simple operation, intuitive strength index data and comprehensive test data is needed to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a gas pipeline compressive strength testing device. The technical solution innovatively uses the principle of interaction between air pressure and hydraulic pressure, and adjusts the air pressure change in the pneumatic piston cylinder by controlling the servo motor, thereby realizing a comprehensive test of the compressive strength and tear strength of the gas pipeline. This method effectively solves the problems of the singleness and limitations of the mechanical property evaluation of gas pipelines in the prior art, breaks the technical prejudice that traditional detection technology can only perform a single type of test, and greatly improves the application scope and detection efficiency of the detection equipment, providing a new technical approach for the comprehensive evaluation of the safety performance of gas pipelines.

[0006] The technical solution adopted by the present invention is as follows: a gas pipeline compressive strength testing device, comprising a main box and a testing box fixedly arranged on the inner wall of the bottom of the main box, wherein the main box is provided with a strength testing component and a hydraulic control component, wherein the strength testing component comprises a fixing frame fixedly arranged on the bottom wall of the main box, a bidirectional screw rod rotatably arranged in the fixing frame in the middle, a guide rod horizontally fixedly arranged in the fixing frame in the middle, a connecting block threadedly sleeved on the bidirectional screw rod and horizontally slidably sleeved on the guide rod, a reduction motor fixedly arranged on the outer wall of the testing box, a stopper rotatably arranged on the upper wall of the connecting block, a guide slide rod horizontally slidably arranged in the stopper at one end, and a baffle fixedly arranged at the other end of the guide slide rod, wherein the outer sleeve of the guide slide rod A spring is provided, one end of the spring is fixedly connected to the baffle, and the other end of the spring is fixedly connected to the block. A switch 1 is provided on the outer wall of the block close to the baffle, and a switch 2 is provided on the baffle. Both ends of the bidirectional screw are horizontally rotatably arranged on the inner wall of the detection box, and both ends of the guide rod are horizontally fixedly arranged on the inner wall of the detection box. One end of the bidirectional screw is coaxially fixedly connected to the output end of the reduction motor, and the fixing frame is used to support the bidirectional screw and the guide rod. The bidirectional screw is used to rotationally drive the movement of the connecting block and the block. The telescopic stroke of the guide slide rod can limit the deformation degree of the gas pipeline to be detected. The setting of switch 1 can automatically shut down the servo motor after the gas pipeline to be detected is deformed, thereby facilitating the observation of the liquid level changes inside the observation tube.

[0007] As a preferred technical solution of the present scheme, the strength detection component also includes a pneumatic piston cylinder symmetrically and horizontally fixedly arranged on the inner wall of the main box, a pneumatic piston movably arranged in the pneumatic piston cylinder, a connecting rod horizontally slidingly arranged on the side wall of the detection box, one end of the connecting rod is fixedly connected to the pneumatic piston, and the other end of the connecting rod is fixedly provided with an arc-shaped pressure block, a guide groove 2 is opened in the arc-shaped pressure block, a sliding block is horizontally slidably arranged in the guide groove 2, a switch button is arranged in the guide groove 2, and the switch button corresponds to the sliding block, a guide groove 1 is symmetrically opened in the arc-shaped pressure block, an L-shaped connecting rod 1 is horizontally slidably arranged in the guide groove 1, one end of the L-shaped connecting rod 1 is fixedly connected to the sliding block, and the other end of the L-shaped connecting rod 1 is fixedly provided There are two L-shaped connecting rods, and guide cylinders are symmetrically fixed on the top and bottom walls of the arc-shaped pressure block. A fixing claw is vertically slidably provided in the guide cylinder. A fixing plate one is fixed on the outer wall of the guide cylinder, and a fixing plate two is fixed on the outer wall of the fixing claw. A tension spring is connected between the fixing plate one and the fixing plate two. The other end of the L-shaped connecting rod two is in contact with the fixing plate two. The switch two corresponds to the position of the fixing claw. The pneumatic piston cylinder can provide a movement track for the pneumatic piston. The pneumatic piston can move the connecting rod and the arc-shaped pressure block through the change of air pressure inside the pneumatic piston cylinder. The switch button is used to start the pump when the sliding block reaches a specific position. The fixing claw is used to grasp the outer edge of the gas pipeline for testing. The switch two is used to turn off the reduction motor when the fixing claw reaches a specific position.

[0008] As a preferred technical solution of this scheme, the hydraulic control component includes a hydraulic piston cylinder fixedly arranged on the outer wall of the top of the detection box, a hydraulic piston movably arranged in the hydraulic piston cylinder, a threaded cylinder with a lower end rotatably connected to the upper wall of the hydraulic piston, a threaded mounting frame fixedly arranged on the inner wall of the top of the main box, a servo motor fixedly arranged on the outer wall of the top of the main box, and a guide column with an upper end vertically rotatably arranged on the inner wall of the top of the main box, the output end of the servo motor is transmission-connected to the upper end of the guide column, a threaded hole is penetrated through the bottom wall of the threaded mounting frame, and the upper half of the circumferential side wall of the threaded cylinder is threaded The lower half of the circumferential side wall of the threaded cylinder is smoothly arranged, the threaded portion of the threaded cylinder is threadedly arranged in the threaded hole, the smooth portion of the threaded cylinder is vertically slidably arranged on the top wall of the hydraulic piston cylinder, the guide column is slidably sleeved in the threaded cylinder, the threaded cylinder can realize the vertical movement of the hydraulic piston through the cooperation of its threaded portion with the threaded hole of the threaded mounting frame and the sliding of the smooth portion on the top wall of the hydraulic piston cylinder, the hydraulic piston cylinder is used to provide a track for the hydraulic piston to move, and the hydraulic piston is used to move up and down in the hydraulic piston cylinder, thereby controlling the pressure change inside the hydraulic piston cylinder.

[0009] As a preferred technical solution of this scheme, the hydraulic control component also includes an observation tube arranged on the top inner wall of the main box, a water storage tank fixedly arranged on the top outer wall of the main box, and a pump fixedly arranged on the bottom inner wall of the water storage tank. The suction end of the pump is connected with the inside of the water storage tank, and the outlet end of the pump is connected with the inside of the observation tube. The outlet end of the pump extends into the bottom of the observation tube. A connecting pipe 1 is connected between the lower side wall of the observation tube and the top wall of the hydraulic piston cylinder. A fixing plate 3 is symmetrically fixed on the inner wall of the main box. The fixing plate 3 A connecting pipe 2 is fixedly provided inside, one end of which is connected to the lower side wall of the hydraulic piston, and the other end of which is connected to the side wall of the pneumatic piston cylinder away from the detection box. A vent is provided on the side wall of the pneumatic piston cylinder close to the detection box. The observation tube is provided to observe the change of the liquid level, and can indirectly measure the deformation of the gas pipeline when it is under pressure, so as to evaluate its compressive and tearing strength. The vent can allow the air pressure in the pneumatic piston cylinder to communicate with the outside world, so as to adjust and balance the air pressure and ensure the accuracy of the test.

[0010] As a preferred technical solution of the present invention, a ventilation hole is provided through the upper side of the side wall of the observation tube to balance the air pressure inside and outside the observation tube to prevent the formation of a vacuum and ensure that the liquid can flow freely. A slot is provided in the fixing claw to fix or clamp the gas pipeline to ensure the stable position of the gas pipeline during the test.

[0011] As a preferred technical solution of the present invention, the switch 1 is electrically controlled and connected to the servo motor, and the switch 1 is used to turn off the servo motor at a specific position, stop the movement of the hydraulic piston, and control the test process. The switch 2 is electrically controlled and connected to the reduction motor, and the switch button is electrically controlled and connected to the pump. The switch 2 is used to turn off the reduction motor at a specific position, stop related mechanical movement, and control the test process.

[0012] As a preferred technical solution of the present invention, the observation tube is made of tempered glass, and scale lines are provided on the side wall of the observation tube for accurately reading the liquid level height, thereby calculating the compressive strength of the gas pipeline.

[0013] After adopting the above structure, the beneficial effects of the present invention are as follows: 1. By activating the servo motor in the forward and reverse directions, the air pressure change in the pneumatic piston cylinder is controlled, and then the pressure gradient is used to perform compression and tear resistance tests on the gas pipeline. In this process, the compression and release of the air pressure causes the internal volume of the hydraulic piston cylinder to change accordingly. By accurately monitoring the increase and decrease of the liquid volume in the cylinder, the compressive strength and tear strength index of the gas pipeline are calculated. This technical solution cleverly combines the interaction between air pressure and hydraulic pressure, and provides an efficient and reliable testing method for the quantitative evaluation of the mechanical properties of the gas pipeline. 2. When the sliding block contacts the outer wall of the gas pipeline to be tested, it will automatically drive the L-shaped connecting rod 1 and the L-shaped connecting rod 2 to move, thereby activating the tension spring mechanism, so that the fixing claw automatically locks the gas pipeline to be tested. At the same time, this action will trigger the switch button to start the water filling process from the water tank to the observation tube, preparing the liquid level change monitoring conditions for the subsequent strength test. This process realizes the automation of pipeline fixing and test preparation actions, ensuring the continuity and accuracy of the test process; 3. By controlling the servo motor in forward and reverse directions, the compression test and tear test are performed respectively, realizing dual-mode detection, so that the mechanical properties of the pipeline can be evaluated from two perspectives. This comprehensive detection strategy not only improves the comprehensiveness of the detection data, but also effectively reduces the risk of misjudgment by cross-validating different test results, ensuring the safety and reliability of the gas pipeline in practical applications; 4. The equipment has an adaptive adjustment function and can adapt to gas pipelines of different diameters. By adjusting the position of the fixed claws and the sliding block, the equipment's ability to detect pipelines of different specifications is ensured, thereby enhancing the scope of application and flexibility of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present solution and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0015] Figure 1 This is a three-dimensional diagram of the overall structure of a gas pipeline compressive strength testing device proposed by the present invention; Figure 2 This is a front view of the overall structure of a gas pipeline compressive strength testing device proposed by the present invention; Figure 3 This is a cross-sectional view of the internal structure of a gas pipeline compressive strength testing device proposed by the present invention; Figure 4 for Figure 3 A magnified view of the local structure of part A; Figure 5 for Figure 3 A magnified view of the local structure of part B; Figure 6 for Figure 3 A magnified view of the local structure of part C.

[0016] In the attached drawings: 1. main box, 2. detection box, 3. water storage tank, 4. observation tube, 5. hydraulic piston cylinder, 6. servo motor, 7. guide column, 8. threaded cylinder, 9. pump, 10. ventilation hole, 11. connecting pipe 1, 12. connecting pipe 2, 13. hydraulic piston, 14. pneumatic piston, 15. connecting rod, 16. arc pressure block, 17. guide groove 1, 18. guide groove 2, 19. sliding block, 20. L-shaped connecting rod 1, 21. L-shaped connecting rod 2, 22. switch button, 23. Fixed plate one, 24, tension spring, 25, fixed plate two, 26, fixed claw, 27, guide cylinder, 28, bidirectional screw, 29, connecting block, 30, fixed frame, 31, block, 32, guide slide bar, 33, baffle, 34, spring, 35, slot, 36, strength detection component, 37, threaded mounting frame, 38, fixed plate three, 39, reduction motor, 40, guide rod, 41, switch one, 42, switch two, 43, hydraulic control component, 44, pneumatic piston cylinder, 45, vent. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0019] Embodiment 1, as Figure 1-Figure 4 as well as Figure 6 As shown, a gas pipeline compressive strength testing device includes a main box 1 and a testing box 2 fixedly arranged on the inner wall of the bottom of the main box 1, wherein the main box 1 is provided with a strength testing component 36 and a hydraulic control component 43, wherein the strength testing component 36 includes a fixing frame 30 fixedly arranged on the bottom wall of the main box 1, a bidirectional screw 28 rotatably arranged in the middle of the fixing frame 30, a guide rod 40 horizontally fixedly arranged in the middle of the fixing frame 30, a connecting block 29 threadedly sleeved on the bidirectional screw 28 and horizontally slidably sleeved on the guide rod 40, a reduction motor 39 fixedly arranged on the outer wall of the testing box 2, and a stopper 31 rotatably arranged on the upper wall of the connecting block 29. , a guide slide bar 32 with one end horizontally slidingly arranged in the block 31 and a baffle 33 fixedly arranged at the other end of the guide slide bar 32, a spring 34 is sleeved on the outside of the guide slide bar 32, one end of the spring 34 is fixedly connected to the baffle 33, and the other end of the spring 34 is fixedly connected to the block 31, a switch 1 41 is provided on the outer wall of the block 31 close to the baffle 33, and a switch 2 42 is provided on the baffle 33, both ends of the bidirectional screw 28 are horizontally rotatably arranged on the inner wall of the detection box 2, both ends of the guide rod 40 are horizontally fixedly arranged on the inner wall of the detection box 2, and one end of the bidirectional screw 28 is coaxially fixedly connected to the output end of the reduction motor 39.

[0020] The strength detection assembly 36 also includes a pneumatic piston cylinder 44 symmetrically and horizontally fixedly arranged on the inner wall of the main box 1, a pneumatic piston 14 is movably arranged in the pneumatic piston cylinder 44, and a connecting rod 15 is horizontally slidably arranged on the side wall of the detection box 2, one end of the connecting rod 15 is fixedly connected to the pneumatic piston 14, and the other end of the connecting rod 15 is fixedly provided with an arc-shaped pressure block 16, a guide groove 18 is provided in the arc-shaped pressure block 16, a sliding block 19 is horizontally slidably arranged in the guide groove 18, a switch button 22 is provided in the guide groove 18, and the switch button 22 corresponds to the sliding block 19, a guide groove 17 is symmetrically provided in the arc-shaped pressure block 16, and the guide groove 17 is symmetrically provided in the arc-shaped pressure block 16. An L-shaped connecting rod 20 is provided to slide horizontally in the groove 17, one end of the L-shaped connecting rod 20 is fixedly connected to the sliding block 19, and an L-shaped connecting rod 21 is fixedly provided at the other end of the L-shaped connecting rod 20. Guide cylinders 27 are symmetrically fixed on the top and bottom walls of the arc-shaped pressure block 16, and a fixing claw 26 is vertically slidable in the guide cylinder 27. A fixing plate 23 is fixed on the outer wall of the guide cylinder 27, and a fixing plate 25 is fixed on the outer wall of the fixing claw 26. A tension spring 24 is connected between the fixing plate 1 23 and the fixing plate 25, and the other end of the L-shaped connecting rod 21 abuts against the fixing plate 25. The switch 2 42 corresponds to the position of the fixing claw 26.

[0021] Embodiment 2, this embodiment is based on the previous embodiment, such as Figure 1-Figure 6 As shown, the hydraulic control component 43 includes a hydraulic piston cylinder 5 fixedly arranged on the top outer wall of the detection box 2, a hydraulic piston 13 movably arranged in the hydraulic piston cylinder 5, a threaded cylinder 8 rotatably connected to the upper wall of the hydraulic piston 13 at the lower end, a threaded mounting frame 37 fixedly arranged on the top inner wall of the main box 1, a servo motor 6 fixedly arranged on the top outer wall of the main box 1, and a guide column 7 vertically rotatably arranged on the top inner wall of the main box 1 at the upper end, the output end of the servo motor 6 is transmission-connected to the upper end of the guide column 7, a threaded hole is penetrated through the bottom wall of the threaded mounting frame 37, the upper half of the circumferential side wall of the threaded cylinder 8 is threaded, and the lower half of the circumferential side wall of the threaded cylinder 8 is smoothly arranged, the threaded portion of the threaded cylinder 8 is threadedly arranged in the threaded hole, the smooth portion of the threaded cylinder 8 is vertically slidably arranged on the top wall of the hydraulic piston cylinder 5, and the guide column 7 is slidably sleeved in the threaded cylinder 8.

[0022] The hydraulic control assembly 43 also includes an observation tube 4 arranged on the top inner wall of the main box 1, a water tank 3 fixedly arranged on the top outer wall of the main box 1, and a pump 9 fixedly arranged on the bottom inner wall of the water tank 3, the suction end of the pump 9 is connected with the inside of the water tank 3, the outlet end of the pump 9 is connected with the inside of the observation tube 4, the outlet end of the pump 9 extends into the bottom of the observation tube 4, a connecting pipe 11 is connected between the lower side wall of the observation tube 4 and the top wall of the hydraulic piston cylinder 5, a fixing plate 3 38 is symmetrically fixed on the inner wall of the main box 1, a connecting pipe 2 12 is fixedly penetrated in the fixing plate 3 38, one end of the connecting pipe 2 12 is connected with the lower side wall of the hydraulic piston 13, the other end of the connecting pipe 2 12 is connected with the side wall of the pneumatic piston cylinder 44 away from the detection box 2, and a vent 45 is penetrated through the side wall of the pneumatic piston cylinder 44 close to the detection box 2.

[0023] A ventilation hole 10 is formed through the upper side of the side wall of the observation tube 4 , and a slot 35 is formed in the fixing claw 26 .

[0024] The switch 1 41 is electrically connected to the servo motor 6 , the switch 2 42 is electrically connected to the reduction motor 39 , and the switch button 22 is electrically connected to the pump 9 .

[0025] The observation tube 4 is made of tempered glass, and scale lines are arranged on the side wall of the observation tube 4 .

[0026] In specific use, when testing the compressive strength of the gas pipeline, first water is injected into the water storage tank 3, and then the gas pipeline to be tested is placed in the test box 2, and then the servo motor 6 is started. The rotation of the servo motor 6 will drive the guide column 7 and the threaded cylinder 8 to rotate, and the threaded cylinder 8 will move downward, thereby pushing the hydraulic piston 13 downward. At this time, the air in the hydraulic piston cylinder 5 enters the pneumatic piston cylinder 44 through the connecting pipe 12, thereby pushing the pneumatic piston 14, the connecting rod 15 and the arc-shaped pressure block 16 to move toward the middle. When the sliding block 19 contacts the outer wall of the gas pipeline to be detected, the sliding block 19 will enter the guide groove 2 18 and drive the L-shaped connecting rod 1 20 and the L-shaped connecting rod 21 to move to one side. When the upper end of the L-shaped connecting rod 21 is no longer in contact with the lower wall of the fixing plate 25, the tension spring 24 pulls the fixing plate 25 and the fixing claw 26 to move. At this time, the outer edge of the pipeline to be detected is inserted into the card groove 35. When the sliding block 19 contacts the switch button 22, the switch button 22 starts the pump 9 to pump the water in the water tank 3 into the observation tube 4. Subsequently, the reduction motor 39 is started, and the reduction motor 39 drives the bidirectional screw 28 to rotate, so that the connecting block 29 and the stopper 31 move simultaneously. When the switch 2 42 contacts the fixed claw 26, the switch 2 42 turns off the reduction motor 39, and at this time, the liquid level height inside the observation tube 4 is recorded; The servo motor 6 is started again, and the hydraulic piston 13 continues to move downward. The water in the observation tube 4 is pumped into the hydraulic piston tube 5 and is located above the hydraulic piston 13. At this time, the air pressure in the pneumatic piston tube 44 gradually increases, and the thrust of the arc-shaped pressure block 16 also increases accordingly. When the gas pipeline is deformed, the arc-shaped pressure block 16 will drive the guide tube 27 and the fixed claw 26 to move, and the fixed claw 26 will then drive the baffle 33 and the guide slide rod 32 to move toward the baffle 31. When the baffle 33 contacts the switch 1 41, the switch 1 41 turns off the servo motor 6. The compressive strength value of the gas pipeline can be obtained by observing the reduction in the liquid level inside the observation tube 4. When testing the tear strength of the gas pipeline, first start the pump 9 to pump the water in the water tank 3 into the observation tube 4, then start the servo motor 6 to move the hydraulic piston 13 downward, and pump the water in the observation tube 4 into the hydraulic piston cylinder 5. When the outer edge of the gas pipeline to be tested is inserted into the slot 35, the initial position of the stopper 31 before testing is located outside the fixed claw 26, then rotate the stopper 31 180 degrees so that the baffles 33 on both sides are arranged oppositely, and start the reduction motor 39 to move the connecting block 29 and the stopper 31 inward at the same time. When the switch 2 42 contacts the fixed plate 25, the switch 2 42 turns off the reduction motor 39 and records the liquid level in the observation tube 4. Subsequently, the servo motor 6 is started in reverse, the hydraulic piston 13 moves upward, and the fixed claw 26 pulls the outer edge of the gas pipeline to tear and stretch it. When the fixed claw 26 drives the baffle 33 to move and contacts the switch 41, the switch 41 turns off the servo motor 6. By observing the increase in the liquid level inside the tube 4, the tear strength value of the gas pipeline can be obtained.

[0027] In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creatively designing without departing from the purpose of the invention, they should all fall within the scope of protection of the invention.

Claims

1. A gas pipeline compressive strength testing device, characterized by: The invention comprises a main body box (1) and a detection box (2) fixedly arranged on the inner wall of the bottom of the main body box (1), wherein the main body box (1) is provided with a strength detection component (36) and a hydraulic control component (43), wherein the strength detection component (36) comprises a fixing frame (30) fixedly arranged on the bottom wall of the main body box (1), a bidirectional screw (28) rotatably arranged in the middle of the fixing frame (30), a guide rod (40) horizontally fixedly arranged in the middle of the fixing frame (30), a connecting block (29) threadedly sleeved on the bidirectional screw (28) and horizontally slidably sleeved on the guide rod (40), a reduction motor (39) fixedly arranged on the outer wall of the detection box (2), a stopper (31) rotatably arranged on the upper wall of the connecting block (29), and one end of the connecting block (31) horizontally slidably arranged on the upper wall of the connecting block (29). A guide slide bar (32) in the stopper (31) and a baffle (33) fixedly arranged at the other end of the guide slide bar (32); a spring (34) is sleeved on the outer side of the guide slide bar (32); one end of the spring (34) is fixedly connected to the baffle (33); the other end of the spring (34) is fixedly connected to the stopper (31); a switch 1 (41) is arranged on the outer wall of the stopper (31) close to the baffle (33); a switch 2 (42) is arranged on the baffle (33); both ends of the bidirectional screw (28) are horizontally rotatably arranged on the inner wall of the detection box (2); both ends of the guide rod (40) are horizontally fixedly arranged on the inner wall of the detection box (2); one end of the bidirectional screw (28) is coaxially fixedly connected to the output end of the reduction motor (39).

2. A gas pipeline compressive strength testing device according to claim 1, characterized in that: The strength detection assembly (36) further comprises a pneumatic piston cylinder (44) symmetrically and horizontally fixedly arranged on the inner wall of the main box (1), a pneumatic piston (14) movably arranged in the pneumatic piston cylinder (44), a connecting rod (15) horizontally slidably arranged on the side wall of the detection box (2), one end of the connecting rod (15) being fixedly connected to the pneumatic piston (14), the other end of the connecting rod (15) being fixedly provided with an arc-shaped pressure block (16), a second guide groove (18) being provided in the arc-shaped pressure block (16), a sliding block (19) being horizontally slidably arranged in the second guide groove (18), a switch button (22) being provided in the second guide groove (18), the switch button (22) corresponding to the sliding block (19), a guide groove (17) being symmetrically provided in the arc-shaped pressure block (16), the guide groove (18) being symmetrically provided in the first guide groove (17), and the guide groove (17) being symmetrically provided in the second guide groove (18). An L-shaped connecting rod 1 (20) is provided to slide horizontally in the groove 1 (17), one end of the L-shaped connecting rod 1 (20) is fixedly connected to the sliding block (19), and an L-shaped connecting rod 2 (21) is fixedly provided at the other end of the L-shaped connecting rod 1 (20). Guide cylinders (27) are symmetrically fixedly provided on the top and bottom walls of the arc-shaped pressure block (16), and a fixing claw (26) is vertically slidably provided in the guide cylinder (27). A fixing plate 1 (23) is fixedly provided on the outer wall of the guide cylinder (27), and a fixing plate 2 (25) is fixedly provided on the outer wall of the fixing claw (26). A tension spring (24) is connected between the fixing plate 1 (23) and the fixing plate 2 (25), and the other end of the L-shaped connecting rod 2 (21) is in contact with the fixing plate 2 (25), and the switch 2 (42) corresponds to the position of the fixing claw (26).

3. A gas pipeline compressive strength testing device according to claim 2, characterized in that: The hydraulic control assembly (43) comprises a hydraulic piston cylinder (5) fixedly arranged on the top outer wall of the detection box (2), a hydraulic piston (13) movably arranged in the hydraulic piston cylinder (5), a threaded cylinder (8) whose lower end is rotatably connected to the upper wall of the hydraulic piston (13), a threaded mounting frame (37) fixedly arranged on the top inner wall of the main box (1), a servo motor (6) fixedly arranged on the top outer wall of the main box (1), and a guide column (7) whose upper end is vertically rotatably arranged on the top inner wall of the main box (1), the output end of the servo motor (6) is transmission-connected to the upper end of the guide column (7), a threaded hole is penetrated through the bottom wall of the threaded mounting frame (37), the upper half of the circumferential side wall of the threaded cylinder (8) is threaded, the lower half of the circumferential side wall of the threaded cylinder (8) is smooth, the threaded portion of the threaded cylinder (8) is threadedly arranged in the threaded hole, the smooth portion of the threaded cylinder (8) is vertically slidably arranged on the top wall of the hydraulic piston cylinder (5), and the guide column (7) is slidably sleeved in the threaded cylinder (8).

4. A gas pipeline compressive strength testing device according to claim 3, characterized in that: The hydraulic control assembly (43) further comprises an observation tube (4) arranged on the top inner wall of the main body box (1), a water storage tank (3) fixedly arranged on the top outer wall of the main body box (1), and a pump (9) fixedly arranged on the bottom inner wall of the water storage tank (3), wherein the suction end of the pump (9) is connected to the inside of the water storage tank (3), the outlet end of the pump (9) is connected to the inside of the observation tube (4), the outlet end of the pump (9) extends into the bottom of the observation tube (4), and the lower side wall of the observation tube (4) is connected to the top wall of the hydraulic piston cylinder (5). A connecting pipe 1 (11) is provided for through-connection, a fixing plate 3 (38) is symmetrically fixedly provided on the inner wall of the main box (1), a connecting pipe 2 (12) is fixedly provided through-connected in the fixing plate 3 (38), one end of the connecting pipe 2 (12) is through-connected to the lower side wall of the hydraulic piston (13), the other end of the connecting pipe 2 (12) is through-connected to the side wall of the pneumatic piston cylinder (44) away from the detection box (2), and a vent hole (45) is provided through-connected to the side wall of the pneumatic piston cylinder (44) close to the detection box (2).

5. A gas pipeline compressive strength testing device according to claim 4, characterized in that: A ventilation hole (10) is provided through the upper side of the side wall of the observation tube (4), and a clamping groove (35) is provided in the fixing claw (26).

6. A gas pipeline compressive strength testing device according to claim 5, characterized in that: The switch 1 (41) is electrically connected to the servo motor (6), the switch 2 (42) is electrically connected to the reduction motor (39), and the switch button (22) is electrically connected to the pump (9).

7. A gas pipeline compressive strength testing device according to claim 6, characterized in that: The observation tube (4) is made of tempered glass, and scale lines are provided on the side wall of the observation tube (4).

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