Clamping device for joint tensile test

Abstract

The invention relates to the technical field of welding testing, in particular to a connector tensile test clamping device which comprises a supporting seat, two clamping bases are slidably connected to the interior of the supporting seat, clamping frames are fixedly connected to the tops of the clamping bases, two movable plates are arranged between the two clamping bases, and the two movable plates are fixedly connected to the supporting seat. The movable plates are slidably connected to the supporting base, arc-shaped grooves are formed in the tops of the movable plates, and two air springs are fixedly installed between the clamping frame and the corresponding movable plates. According to the invention, elastic abdication is carried out through compression of the gas spring in the stretching process, the pressure of a stretching test on conveying equipment is reduced, and when a joint of the pipeline generates a crack in the stretching test, liquid in the pipeline flows out along the crack, so that a tester can visually observe the change of the joint, and the test efficiency is improved. Therefore, the accuracy of test results is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding testing, and in particular to a joint tensile test clamping device. Background Art

[0002] After welding, the pipe joints usually need to be subjected to a tensile test to ensure that the joints can withstand a corresponding degree of pressure and external impact during use, thereby ensuring safety during pipeline transportation.

[0003] The patent document with publication number CN117309566A discloses a flash butt welding joint tensile test device, including a frame, a clamping assembly is arranged at one inner end of the frame, a horizontal moving assembly is arranged in the frame, another clamping assembly is arranged in the horizontal moving assembly, and the two groups of clamping assemblies are used to clamp the two ends of the test pipe respectively; the clamping assembly includes a clamping base plate, and a plurality of clamping jaw mechanisms are slidably connected to the clamping base plate, and the plurality of clamping jaw mechanisms are used to clamp the wall surface of the test pipe, and a self-locking part is arranged in the clamping jaw mechanism.

[0004] In the prior art, when performing a tensile test on a welded joint of a pipeline, the pipelines at both ends of the joint are usually clamped, and then the joint is rigidly stretched directly through a screw rod, so that the tensile force at the joint remains unchanged. In addition, the transmission equipment is greatly damaged during the tensile test. When cracks appear at the weld of the joint and are not completely detached, it is difficult for traditional tensile testing equipment to detect the tensile cracks. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a joint tensile test clamping device.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a joint tensile test clamping device, including a support seat, two clamping bases are slidably connected inside the support seat, the tops of the clamping bases are fixedly connected with clamping frames, two movable plates are arranged between the two clamping bases, the movable plates are slidably connected to the support seat, the tops of the movable plates are provided with arc grooves, two gas springs are fixedly installed between the clamping frame and the corresponding movable plates, the clamping frame is connected with a limited clamping mechanism, and a mechanism for moving toward each other is connected between the two movable plates; A sealing disc is provided on the side of the two clamping frames which are away from each other. The sealing disc is connected with a turning mechanism and a connecting liquid inlet mechanism, and the connecting liquid inlet mechanism is used to seal and fill the inside of the joint pipe.

[0007] Preferably, the communicating liquid inlet mechanism comprises two L-shaped tubes, and the two L-shaped tubes are respectively fixedly connected to one end of the two blocking discs which are away from each other, and the top ends of the L-shaped tubes are both located above the blocking discs.

[0008] Preferably, both L-shaped tubes are fixedly mounted with a stop valve, the bottom of one of the L-shaped tubes is fixedly connected with a liquid inlet pipe, and a one-way liquid inlet valve is fixedly mounted on the liquid inlet pipe.

[0009] Preferably, the top end of the L-shaped tube is fixedly connected to a guide funnel, and the L-shaped tube is made of transparent plastic material.

[0010] Preferably, the limit clamping mechanism includes two swing rods, the two swing rods are rotatably connected to both sides of the clamping frame, the top of the swing rod is rotatably connected to a movable block, and the adjacent sides of the two movable blocks are fixedly connected with arc-shaped clamping claws, a guide rod is provided inside the clamping frame, and guide bevel grooves are provided at both ends of the guide rod, and the bottom ends of the swing rods are fixedly connected with circular pins, which are slidably inserted in the corresponding guide bevel grooves, and the top of the clamping base is fixedly connected to a first hydraulic cylinder, and the piston shaft of the first hydraulic cylinder is fixedly connected to the bottom of the guide rod.

[0011] Preferably, the mechanism for moving toward each other includes two mounting brackets, the two mounting brackets are respectively fixedly connected to the two ends of the top of the support base, two bidirectional lead screws are rotatably connected between the two mounting brackets, connecting rings are fixedly connected on both sides of the movable plate, the connecting rings are threadedly connected to the corresponding bidirectional lead screws, a rotating shaft is rotatably connected to the support base, a motor is fixedly installed on the support base, the output shaft of the motor is fixedly connected to one end of the rotating shaft, a first gear is fixedly connected to the center position of the rotating shaft, a second gear is fixedly connected to the center position of the two bidirectional lead screws, a fixed frame is fixedly connected to the center position of the top of the support base, and two groups of matching gears are rotatably connected inside the fixed frame, the number of matching gears in each group is two, the two matching gears in the same group are meshed with each other, and the two matching gears in the same group are respectively meshed with the first gear and the corresponding second gear.

[0012] Preferably, the flipping mechanism includes a support frame, which is fixedly connected to the top of the support seat, and both ends of the support frame are fixedly connected to limit blocks, an arc rod is slidably inserted on the limit block, the bottom end of the arc rod is fixedly connected to the corresponding sealing disc, and the arc rod is connected to a transmission push-pull mechanism.

[0013] Preferably, the transmission push-pull mechanism includes a second hydraulic cylinder and a limit bracket, the second hydraulic cylinder is fixedly installed on the top of the support frame, the limit bracket is fixedly connected to the top of the arc rod, the limit bracket is fixedly connected to a light rod, the piston shaft of the second hydraulic cylinder is fixedly connected to a strip groove rail, and the light rod is slidably sleeved inside the strip groove rail.

[0014] Preferably, an annular frame is provided at one end of the two sealing discs away from each other, a plurality of bolts are threadedly fixed between the annular frame and the corresponding sealing disc, a circular ring is sleeved on the surface of the sealing disc, a sealing ring is fixedly connected to the adjacent sides of the two circular rings, and a plurality of support bars are fixedly connected between the annular frame and the corresponding circular ring.

[0015] Preferably, a plurality of spherical grooves are provided inside the arc-shaped groove along the circumferential direction, and contact balls are rollingly connected inside the spherical grooves.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The two movable plates are moved away from each other through the action of the opposite moving mechanism, and the corresponding gas spring is squeezed during the movement of the movable plate, so that the piston rod of the gas spring moves and squeezes the gas inside the cavity, thereby gradually increasing the pressure on the clamping frame, so that the two pipes are gradually stretched in the opposite direction along the welding position of the joint. The tensile force is gradually increased, and the elasticity is given by the compression of the gas spring during the stretching process, thereby reducing the pressure on the conveying equipment caused by the tensile test.

[0017] 2. When cracks appear at the joint of the pipe during the tensile test, the liquid inside the pipe flows out along the cracks, allowing the test personnel to intuitively observe the changes at the joint, thereby improving the accuracy of the test results.

[0018] 3. After the two sealing discs are turned down and block the openings of the two pipes at one end away from each other, liquid is injected into the interior along the top of one of the L-shaped tubes until the liquid level inside the L-shaped tube is above the sealing disc. A communicating vessel is formed between the two L-shaped tubes and the two pipes, and the air inside the two pipes is completely discharged and filled with liquid through the principle of communicating vessel.

[0019] 4. Close the internal connection of the L-shaped pipe through a stop valve, and install a hydraulic liquid pipeline on the liquid inlet pipe to fill the pipe with liquid to keep it sealed and generate hydraulic pressure. When cracks appear at the joint of the two pipes during the tensile test, the hydraulic liquid can be sprayed out directly from the cracks, thereby improving the intuitiveness of leakage observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a first structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement at point A; Figure 3 For the present invention Figure 1 A schematic diagram of the structure at B in FIG. Figure 4 It is a second structural schematic diagram of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure at position C in FIG. Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the structure at D in FIG. Figure 8 It is a schematic diagram of the movable plate structure of the present invention; Fig. 9 It is a cross-sectional schematic diagram of the matching structure of the sealing disc, the annular frame and the circular ring of the present invention.

[0021] In the figure: 1, support seat; 2, clamping base; 3, clamping frame; 4, movable plate; 5, arc groove; 6, gas spring; 7, blocking disc; 8, L-shaped pipe; 9, stop valve; 10, liquid inlet pipe; 11, one-way liquid inlet valve; 12, guide funnel; 13, swing rod; 14, movable block; 15, arc clamping claw; 16, guide rod; 17, guide inclined groove; 18, round pin; 19, first hydraulic cylinder; 20, mounting frame; 21, two-way screw; 2 2. Connecting ring; 23. Rotating shaft; 24. Motor; 25. First gear; 26. Second gear; 27. Fixed frame; 28. Matching gear; 29. ​​Support frame; 30. Limit block; 31. Arc rod; 32. Second hydraulic cylinder; 33. Limit bracket; 34. Bar rod; 35. Strip groove rail; 36. Ring frame; 37. Bolt; 38. Circular ring; 39. Sealing ring; 40. Support bar; 41. Spherical groove; 42. Contact ball. DETAILED DESCRIPTION

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0023] like Figures 1 to 9 The clamping device for a joint tensile test shown in the figure comprises a support seat 1, two clamping bases 2 are slidably connected inside the support seat 1, and a clamping frame 3 is fixedly connected to the top of each clamping base 2. Two movable plates 4 are arranged between the two clamping bases 2, and the movable plates 4 are slidably connected to the support seat 1. The top of each movable plate 4 is provided with an arc groove 5 (such as Figure 8As shown), two gas springs 6 are fixedly installed between the clamping frame 3 and the corresponding movable plate 4, the clamping frame 3 is connected to a limited position clamping mechanism, and a mechanism for moving toward each other is connected between the two movable plates 4; The two clamping frames 3 are both provided with a blocking disc 7 on one side away from each other. Fig. 9 As shown in the figure, a flip mechanism and a connecting liquid inlet mechanism are connected on the joint, and liquid is sealed and filled into the joint pipe through the connecting liquid inlet mechanism; when working, the prior art usually clamps the pipes at both ends of the joint and directly transmits and stretches the joint rigidly through a screw rod when performing a tensile test on the welded joint of the pipe, so that the tensile force at the joint remains unchanged, and the transmission equipment is greatly damaged during the tensile test. When cracks occur at the joint welding and are not completely detached, it is difficult for traditional tensile testing equipment to find the tensile cracks; the present technical solution can solve the above problems, and the specific working method is as follows: the two pipes fixed by welding are placed in the arc groove 5 on the top of the two movable plates 4, and the welding joints of the two pipes are located between the two movable plates 4, and then the two pipes are clamped and fixed respectively by the limit clamping mechanisms on the two clamping frames 3 The two sealing discs 7 are fixed, and then the flipping mechanism is used to flip the two sealing discs 7 downward and block the openings at one end of the two pipes that are away from each other. The liquid inlet mechanism is connected to fill the inside of the pipes with liquid, and the two movable plates 4 are moved away from each other by the mechanism for moving toward each other. In the process of moving the movable plates 4, the corresponding gas springs 6 are squeezed, so that the piston rod of the gas spring 6 moves and squeezes the gas inside the cavity, thereby gradually increasing the pressure on the clamping frame 3, and gradually increasing the tensile force when the two pipes are reversely stretched along the welding position of the joint. In the stretching process, the gas spring 6 is compressed to elastically give way, thereby reducing the pressure generated by the tensile test on the transmission equipment. When cracks are generated at the joints of the pipes during the tensile test, the liquid inside the pipes flows out along the cracks, so that the test personnel can intuitively observe the changes at the joints, thereby improving the accuracy of the test results.

[0024] As a further embodiment of the present invention, the connecting liquid inlet mechanism includes two L-shaped tubes 8, and the two L-shaped tubes 8 are respectively fixedly connected to the ends of the two sealing discs 7 that are away from each other, and the top ends of the L-shaped tubes 8 are located above the sealing discs 7; when working, the L-shaped tubes 8 are fixedly connected to the two sealing discs 7, and the top ends of the L-shaped tubes 8 are located above the sealing discs 7. After the two sealing discs 7 are flipped downward (the specific principle is explained later) and block the openings of the ends of the two pipes that are away from each other, liquid is injected into the interior along the top end of one of the L-shaped tubes 8 until the liquid level inside the L-shaped tube 8 is located above the sealing disc 7, and a communicating vessel is formed between the two L-shaped tubes 8 and the two pipes, and the air inside the two pipes is completely discharged and filled with liquid through the principle of a communicating vessel.

[0025] As a further implementation scheme of the present invention, two L-shaped tubes 8 are fixedly installed with stop valves 9, and the bottom of one of the L-shaped tubes 8 is fixedly connected with a liquid inlet pipe 10, and a one-way liquid inlet valve 11 is fixedly installed on the liquid inlet pipe 10; during operation, when a communicating vessel is formed between the two L-shaped tubes 8 and the two pipes, and the air inside the two pipes is completely discharged and filled with liquid through the principle of the communicating vessel, the internal connection of the L-shaped tube 8 is closed through the stop valve 9, and a liquid pipeline with hydraulic pressure is installed on the liquid inlet pipe 10, so that the inside of the pipe is filled with liquid and remains blocked and generates hydraulic pressure. When cracks are generated at the joint of the two pipes during the tensile test, the liquid with hydraulic pressure can be directly sprayed out from the cracks, thereby improving the intuitiveness of leakage observation.

[0026] As a further implementation scheme of the present invention, the top end of the L-shaped tube 8 is fixedly connected to a guide funnel 12, and the L-shaped tube 8 is made of transparent plastic. During operation, by fixing the guide funnel 12 at the top end of the L-shaped tube 8, it is convenient to inject liquid into the interior of the L-shaped tube 8, and by the transparent plastic material of the L-shaped tube 8, it is convenient to observe the liquid level inside the L-shaped tube 8, thereby ensuring that the interior of the pipeline is completely filled with liquid. Liquid injection through the guide funnel 12 replaces the hydraulic injection of the liquid inlet pipe 10, thereby preventing the hydraulic liquid from spraying out from the top opening of the L-shaped tube 8.

[0027] As a further embodiment of the present invention, the limit clamping mechanism includes two swing rods 13 (such as Figure 7 As shown in the figure, two swing rods 13 are rotatably connected to the two sides of the clamping frame 3, the top of the swing rod 13 is rotatably connected to the movable block 14, and the adjacent sides of the two movable blocks 14 are fixedly connected to the arc-shaped clamping claws 15, and the inside of the clamping frame 3 is provided with a guide rod 16, and both ends of the guide rod 16 are provided with guide inclined grooves 17, and the bottom ends of the swing rods 13 are fixedly connected to round pins 18, and the round pins 18 are respectively slidably inserted in the corresponding guide inclined grooves 17, and the top of the clamping base 2 is fixedly connected to the first hydraulic cylinder 19, and the piston shaft of the first hydraulic cylinder 19 is fixedly connected to the bottom of the guide rod 16; when working, the two welded and fixed pipes are moved from the opposite device to the opposite device. The two arc-shaped clamping jaws 15 are axially moved between them, so that the two pipes are respectively located between the two sets of arc-shaped clamping jaws 15, and then the piston shaft of the first hydraulic cylinder 19 moves upward to drive the guide rod 16 to rise synchronously, and the guiding action of the guiding inclined groove 17 on the circular pin 18 is used to make the two swinging rods 13 rotate along the rotating connection, and the top ends of the two swinging rods 13 are close to each other, so as to drive the arc-shaped clamping jaws 15 on the two movable blocks 14 to contact and extrude the side of the pipe, and clamp and fix the pipe. When the piston shaft of the first hydraulic cylinder 19 moves in the opposite direction, the two arc-shaped clamping jaws 15 move away from each other and release the clamping limit of the pipe.

[0028] As a further embodiment of the present invention, the moving mechanism toward each other includes two mounting frames 20, and the two mounting frames 20 are respectively fixedly connected to the two ends of the top of the support seat 1 (such as Figure 1 As shown, two mounting frames 20 are rotatably connected with two bidirectional lead screws 21, both sides of the movable plate 4 are fixedly connected with connecting rings 22, the connecting rings 22 are threadedly connected to the corresponding bidirectional lead screws 21, and the support seat 1 is rotatably connected with a rotating shaft 23 (as shown Figure 4 As shown in the figure, a motor 24 is fixedly mounted on the support seat 1, and the output shaft of the motor 24 is fixedly connected to one end of the rotating shaft 23. The center position of the rotating shaft 23 is fixedly connected to a first gear 25, and the center positions of the two bidirectional lead screws 21 are fixedly connected to a second gear 26. The center position of the top of the support seat 1 is fixedly connected to a fixed frame 27, and the interior of the fixed frame 27 is rotatably connected to two groups of matching gears 28, and each group of matching gears 28 has two matching gears. The two matching gears 28 in the same group are meshed with each other, and the two matching gears 28 in the same group are respectively meshed with the first gear 25 and the corresponding second gear 26; when working, the rotating shaft 23 is driven to rotate unidirectionally by the rotation of the output shaft of the motor 24, so that the first gear on the rotating shaft 23 The wheels 25 rotate synchronously, and through the meshing transmission of the first gear 25 and the second gear 26 by the matching gear 28, the two bidirectional lead screws 21 rotate synchronously under the transmission action, and through the threaded connection of the bidirectional lead screw 21 and the connecting ring 22, the two sides of the two movable plates 4 are simultaneously transmitted and move away from each other, thereby improving the consistency between the transmission position of the movable plate 4 and the force position of the gas spring 6, reducing the influence of the force position deviation on the compression angle of the gas spring 6, ensuring the vertical force compression of the gas spring 6, extending the service life of the transmission equipment and reducing the influence of the force position on the tensile test data; and through the synchronous transmission of the two bidirectional lead screws 21 by the rotating shaft 23, it is ensured that the two bidirectional lead screws 21 always keep synchronous rotation, thereby improving the synchronization degree of transmission.

[0029] As a further implementation scheme of the present invention, the flipping mechanism includes a support frame 29, which is fixedly connected to the top of the support seat 1, and both ends of the support frame 29 are fixedly connected to the limiting blocks 30, and an arc rod 31 is slidably inserted on the limiting blocks 30, and the bottom ends of the arc rods 31 are fixedly connected to the corresponding blocking discs 7, and the arc rods 31 are connected to the transmission push-pull mechanism; when working, the openings of the two pipes are blocked by the two blocking discs 7, and the arc rod 31 is moved along the sliding position of the limiting blocks 30 through the action of the transmission push-pull mechanism, so that the blocking disc 7 is flipped and moved along the arc trajectory of the arc rod 31, thereby releasing the blocking of the pipeline by the blocking disc 7 and moving the blocking disc 7 to the top of the pipeline, thereby releasing the blocking of the pipeline by the blocking disc 7.

[0030] As a further implementation scheme of the present invention, the transmission push-pull mechanism includes a second hydraulic cylinder 32 and a limit bracket 33. The second hydraulic cylinder 32 is fixedly installed on the top of the support frame 29. The limit bracket 33 is fixedly connected to the top of the arc rod 31. A light rod 34 is fixedly connected to the limit bracket 33. A strip groove rail 35 is fixedly connected to the piston shaft of the second hydraulic cylinder 32. The light rod 34 is slidably sleeved inside the strip groove rail 35. When working, the strip groove rail 35 is driven to move synchronously by the movement of the piston shaft of the second hydraulic cylinder 32, and the sliding limit of the light rod 34 is limited by the strip groove rail 35, so that the arc rod 31 moves synchronously along the sliding connection of the limit block 30, and the light rod 34 moves in coordination inside the strip groove rail 35, thereby realizing the up and down flipping of the blocking disc 7.

[0031] As a further embodiment of the present invention, an annular frame 36 is provided at one end of the two blocking discs 7 away from each other, and a plurality of bolts 37 are threadedly fixed between the annular frame 36 and the corresponding blocking disc 7. A circular ring 38 is sleeved on the surface of the blocking disc 7, and a sealing ring 39 (such as Fig. 9 As shown in the figure, a plurality of support bars 40 are fixedly connected between the annular frame 36 and the corresponding annular ring 38; when working, the annular ring 38 is sleeved on the surface of the sealing disc 7, and the sealing ring 39 on the annular ring 38 contacts the corresponding one end of the pipe, so as to ensure the sealing of the pipe. When the welded pipe is completely broken and moves away from each other during the stretching process, one end of the pipe impacts the sealing ring 39 during the movement, so that the annular ring 38 moves toward the annular frame 36 and squeezes the support bar 40, and the support bar 40 is broken and gives way, and at the same time, the moving impact of the welded pipe is buffered to reduce the damage to the equipment caused by the impact of the pipe. The annular frame 36 is disassembled and replaced before the next tensile test, and the setting of the replaceable parts reduces the equipment loss while ensuring the sealing of the pipe.

[0032] As a further embodiment of the present invention, a plurality of spherical grooves 41 (such as Figure 8 As shown in the figure, the inside of the spherical groove 41 is connected with contact balls 42 in a rolling manner; when working, when the two pipes are respectively located in the corresponding arc grooves 5, the pipes are supported by the corresponding contact balls 42, and when the two movable plates 4 are away from each other, the contact balls 42 contact the pipes and roll in the spherical grooves 41, thereby supporting the pipes and reducing friction losses during movement.

[0033] Working principle of the present invention: The two pipes fixed by welding are placed in the arc groove 5 on the top of the two movable plates 4, and the welding joints of the two pipes are located between the two movable plates 4. Then, the two pipes are clamped and fixed respectively by the limit clamping mechanisms on the two clamping frames 3. Then, the two blocking discs 7 are turned downward by the flipping mechanism to block the openings of the two pipes at one end away from each other. Then, the pipes are filled with liquid by the connecting liquid inlet mechanism. The two movable plates 4 are moved away from each other by the opposite moving mechanism, and the corresponding gas springs 6 are squeezed during the movement of the movable plates 4, so that the piston rod of the gas spring 6 moves and squeezes the gas inside the cavity, thereby gradually increasing the pressure on the clamping frame 3, and gradually increasing the tensile force when the two pipes are reversely stretched along the welding position of the joint. During the stretching process, the gas spring 6 is compressed to elastically give way, thereby reducing the pressure generated by the tensile test on the transmission equipment. When cracks are generated at the joints of the pipes during the tensile test, the liquid inside the pipes flows out along the cracks, so that the test personnel can intuitively observe the changes at the joints, thereby improving the accuracy of the test results.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A joint tensile test clamping device, comprising a support seat (1), characterized in that: The support seat (1) is internally slidably connected to two clamping bases (2), the tops of the clamping bases (2) are fixedly connected to clamping frames (3), two movable plates (4) are arranged between the two clamping bases (2), the movable plates (4) are slidably connected to the support seat (1), the tops of the movable plates (4) are provided with arc grooves (5), two gas springs (6) are fixedly installed between the clamping frames (3) and the corresponding movable plates (4), the clamping frames (3) are connected to limited clamping mechanisms, and a mechanism for moving toward each other is connected between the two movable plates (4); A sealing disc (7) is provided on the side of the two clamping frames (3) that is away from each other. The sealing disc (7) is connected to a turning mechanism and a connecting liquid inlet mechanism, and the connecting liquid inlet mechanism is used to seal and fill the inside of the joint pipe.

2. A joint tensile test clamping device according to claim 1, characterized in that: The communicating liquid inlet mechanism comprises two L-shaped tubes (8), the two L-shaped tubes (8) being respectively fixedly connected to ends of the two blocking discs (7) that are away from each other, and the top ends of the L-shaped tubes (8) are both located above the blocking discs (7).

3. A joint tensile test clamping device according to claim 2, characterized in that: A stop valve (9) is fixedly mounted on each of the two L-shaped tubes (8), and a liquid inlet pipe (10) is fixedly connected to the bottom of one of the L-shaped tubes (8), and a one-way liquid inlet valve (11) is fixedly mounted on the liquid inlet pipe (10).

4. A joint tensile test clamping device according to claim 2, characterized in that: The top end of the L-shaped tube (8) is fixedly connected to a guide funnel (12), and the L-shaped tube (8) is made of transparent plastic material.

5. A joint tensile test clamping device according to claim 1, characterized in that: The position-limiting clamping mechanism comprises two swinging rods (13), the two swinging rods (13) are rotatably connected to two sides inside the clamping frame (3), the top end of the swinging rod (13) is rotatably connected to a movable block (14), and the adjacent sides of the two movable blocks (14) are fixedly connected to arc-shaped clamping claws (15), a guide rod (16) is arranged inside the clamping frame (3), both ends of the guide rod (16) are provided with guide inclined grooves (17), the bottom ends of the swinging rods (13) are fixedly connected to round pins (18), and the round pins (18) are respectively slidably inserted in the corresponding guide inclined grooves (17), and the top of the clamping base (2) is fixedly connected to a first hydraulic cylinder (19), and the piston shaft of the first hydraulic cylinder (19) is fixedly connected to the bottom of the guide rod (16).

6. A joint tensile test clamping device according to claim 1, characterized in that: The opposite movement mechanism comprises two mounting frames (20), the two mounting frames (20) being fixedly connected to the two ends of the top of the support seat (1), respectively; two bidirectional lead screws (21) are rotatably connected between the two mounting frames (20); connecting rings (22) are fixedly connected to both sides of the movable plate (4), the connecting rings (22) are threadedly connected to the corresponding bidirectional lead screws (21); a rotating shaft (23) is rotatably connected to the support seat (1); a motor (24) is fixedly mounted on the support seat (1), and an output shaft of the motor (24) is fixedly connected to one end of the rotating shaft (23). On the end, the center position of the rotating shaft (23) is fixedly connected to a first gear (25), the center positions of the two bidirectional lead screws (21) are fixedly connected to a second gear (26), the center position of the top of the support seat (1) is fixedly connected to a fixed frame (27), and the interior of the fixed frame (27) is rotatably connected to two groups of matching gears (28), each group of matching gears (28) has two matching gears (28), the two matching gears (28) in the same group are meshed with each other, and the two matching gears (28) in the same group are respectively meshed with the first gear (25) and the corresponding second gear (26).

7. A joint tensile test clamping device according to claim 1, characterized in that: The flip mechanism comprises a support frame (29), the support frame (29) is fixedly connected to the top of the support seat (1), both ends of the support frame (29) are fixedly connected to limit blocks (30), an arc rod (31) is slidably inserted on the limit block (30), the bottom end of the arc rod (31) is fixedly connected to the corresponding blocking disc (7), and the arc rod (31) is connected to a transmission push-pull mechanism.

8. A joint tensile test clamping device according to claim 7, characterized in that: The transmission push-pull mechanism comprises a second hydraulic cylinder (32) and a limit bracket (33), wherein the second hydraulic cylinder (32) is fixedly mounted on the top of the support frame (29), the limit bracket (33) is fixedly connected to the top of the arc-shaped rod (31), a light rod (34) is fixedly connected to the limit bracket (33), a strip groove rail (35) is fixedly connected to the piston shaft of the second hydraulic cylinder (32), and the light rod (34) is slidably sleeved inside the strip groove rail (35).

9. A joint tensile test clamping device according to claim 1, characterized in that: An annular frame (36) is provided at one end of the two sealing discs (7) that is away from each other, a plurality of bolts (37) are threadedly fixed between the annular frame (36) and the corresponding sealing disc (7), a circular ring (38) is sleeved on the surface of the sealing disc (7), a sealing ring (39) is fixedly connected to the adjacent sides of the two circular rings (38), and a plurality of support bars (40) are fixedly connected between the annular frame (36) and the corresponding circular ring (38).

10. A joint tensile test clamping device according to claim 1, characterized in that: A plurality of spherical grooves (41) are provided in the arc-shaped groove (5) along the circumferential direction, and contact balls (42) are rollingly connected inside the spherical grooves (41).

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