A kind of metal corrugated pipe weld pipe weld strength detection device

Abstract

The application discloses a kind of weld pipe weld seam strength detection devices for metal bellows, it is related to metal bellows detection technical field.This kind of weld pipe weld seam strength detection devices for metal bellows, including the electric box and switch control box being set on rack.This kind of weld pipe weld seam strength detection devices and method for metal bellows, by simulating the principle of pipe hydraulic forming, liquid medium forming is changed to soft solid rubber forming, by exerting axial tension to cause rubber deformation bulging, and then causing welded pipe to occur deformation, by calculating the proportion of deformation bulging to evaluate weld quality, when continuous welded pipe, it needs to be sampled after welding specified length Test, the device only needs to be debugged when expanding pipe for the first time, testing in subsequent continuous production, can be directly used, more convenient and fast than detection of i-shaped piece, in addition, by reducing mold size, detection range is larger, the device is more convenient than special tension testing machine.

Description

A device for testing the weld strength of welded pipes for metal corrugated pipes Technical Field

[0001] This invention relates to the field of metal corrugated pipe testing technology, specifically to a device for testing the weld strength of welded pipes used in metal corrugated pipes. Background Technology

[0002] The welded pipe is made into an I-beam, and the wire-cut cross-section is polished smooth before being clamped on a tensile testing machine for testing. This method is cumbersome to operate, has a long testing cycle, and is difficult to prepare samples, making it impossible to conduct continuous testing in a short period of time.

[0003] However, the welded pipe needs to be cut open with wire cutting, and then the specimen is laid flat. The pipe is prone to wrinkling when laid flat, which affects the accuracy of the test. The I-beam specimen of the specified size is removed by wire cutting. Due to the measurement range of the tensile testing bench, it is impossible to take out a suitable standard I-beam when the pipe diameter is less than 30mm. The wire-cut specimen also needs to be polished with metallographic sandpaper. Improper polishing of the cross-section will cause the specimen test to be distorted. Summary of the Invention

[0004] The purpose of this invention is to provide a weld strength testing device for welded pipes used in metal corrugated pipes, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a weld strength testing device for metal corrugated pipes, comprising an electrical box and a switch control box mounted on a frame, a base plate fixedly connected to the top of the frame, and a left wall plate and a right wall plate fixedly connected to the top of the base plate, a hydraulic cylinder fixedly connected to the side wall of the left wall plate, the hydraulic cylinder including a hydraulic cylinder spindle, a movable guide rod inserted into the side wall of the right wall plate, the movable guide rod being fixed to the end of the hydraulic cylinder spindle, a limit stop sleeve, an expansion rubber ring, an equal diameter sleeve and a fixing ring sequentially sleeved on the side wall of the movable guide rod, a hydraulic station module provided at the bottom of the frame, the hydraulic station module being used to drive the hydraulic cylinder spindle to move, and a control mechanism for controlling the movement stroke of the hydraulic cylinder spindle being provided on the side wall of the right wall plate.

[0006] Preferably, the hydraulic station module includes an oil tank fixedly connected to the bottom of the frame, and a motor and a valve block are fixedly connected to the top of the oil tank. The motor is equipped with a variable vane pump, and the valve block is equipped with a solenoid valve and a relief valve. The valve block is connected to the variable vane pump through an oil supply pipe, and the valve block is connected to the oil cylinder through an oil inlet pipe and an oil return pipe. A pressure gauge is installed on the side wall of the oil supply pipe.

[0007] Preferably, the control mechanism is fixedly connected to the mounting bracket on the side wall of the right wall panel, and two proximity switches are fixedly connected to the side wall of the mounting bracket, while a stroke sensing rod is fixedly connected to the side wall of the cylinder spindle.

[0008] Preferably, a fixed plate is fixedly connected to the top of the frame, a first moving block is connected to the side wall of the fixed plate via a moving module, and an annular cover is connected to the side wall of the first moving block via a telescopic mechanism. A rotating ring is rotatably connected inside the annular cover via a driving mechanism, and a cleaning mechanism for cleaning the bulging rubber ring and the metal bellows is provided at the end of the rotating ring. A detection mechanism for detecting the bulging rubber ring and the metal bellows is also provided at the end of the rotating ring.

[0009] The telescopic mechanism includes two first sleeve rods fixedly connected to the side wall of the first moving block, and a first sleeve is sleeved on the side wall of the first sleeve rod. The other end of the first sleeve is fixed to the end of the annular cover, and a first spring is sleeved on the side wall of each first sleeve. An L-shaped baffle is fixedly connected to the bottom of the annular cover.

[0010] Preferably, the cleaning mechanism includes multiple fixed tubes fixedly inserted into the end of the rotating ring, and multiple second sleeves are fixedly connected to the side wall of the fixed tubes. A second sleeve rod is inserted into the second sleeve, and a cleaning block is fixedly connected to the other end of the second sleeve rod.

[0011] The detection mechanism includes multiple movable tubes, and the movable tubes are connected to the end of the rotating ring through a reset mechanism. The movable tubes are fixed to the end of the rotating ring through telescopic tubes, and multiple third sleeves are fixedly connected to the side wall of the movable tubes. A tapered rod is inserted into the third sleeve, and a ball bearing is provided at the end of the tapered rod. A U-shaped frame is fixedly connected to the side wall of the tapered rod, and a vision sensor is fixedly inserted into the side wall of the U-shaped frame. The movement of the second sleeve and the tapered rod is driven by a pushing mechanism.

[0012] Preferably, the reset mechanism includes two first T-shaped guide rods fixedly connected to the side walls of each moving tube, and a connecting block is sleeved on the side wall of the first T-shaped guide rod. The connecting block is fixed to the end of the rotating ring, and a second spring is sleeved on the side wall of each first T-shaped guide rod. The side wall of the connecting block has an installation hole, and a distance sensor is fixedly inserted into the installation hole.

[0013] Preferably, the driving mechanism includes a ring fixedly connected to the side wall of the rotating ring, and a support plate fixedly connected to the top of the annular cover. A drive motor is fixedly connected to the side wall of the support plate, and a rubber wheel is fixedly connected to the output end of the drive motor.

[0014] Preferably, the pushing mechanism includes an L-shaped tube fixedly connected to the end of the annular cover, and an oil tank fixedly connected to the upper end of the L-shaped tube. A gravity plate is slidably connected inside the oil tank, and two symmetrically arranged second T-shaped guide rods are fixedly connected to the top of the gravity plate. An L-shaped block is sleeved on the side wall of the second T-shaped guide rod, and the L-shaped block is fixed to the top of the gravity plate. A pushing plate is fixedly connected to the top of the gravity plate, and the side wall of the pushing plate is provided with an inclined surface. A second moving block is connected to the top of the oil tank through a reset assembly, and a pushing pin is fixedly connected to the side wall of the second moving block. A connecting frame is fixedly connected to the side wall of the first moving block, and a pushing block is fixedly connected to the top of the connecting frame.

[0015] Preferably, the reset assembly includes a fixing block fixedly connected to the top of the oil tank, and two third T-shaped guide rods are inserted into the side wall of the fixing block. One end of each third T-shaped guide rod is fixed to the side wall of the second moving block, and a third spring is sleeved on the side wall of each third T-shaped guide rod.

[0016] Preferably, a set screw is inserted at the end of the fixed ring, and the set screw is threadedly fixed to the end of the movable guide rod.

[0017] A method for testing the weld strength of welded pipes for metal corrugated pipes includes the following steps:

[0018] S1: When testing welded pipes with an inner diameter of 30mm and a wall thickness of 0.12mm, 68# anti-wear hydraulic oil was used as the pressure medium. First, the electrical box inside the frame was powered on, and then the operation mode was set to manual in the switch control box. The forward and backward stroke positions of the cylinder and proximity switch were adjusted by the jog button. The limit position of the cylinder spindle return was when the outer diameter deformation of the bulging rubber ring reached %; the limit position of the cylinder spindle extension was when no deformation of the bulging rubber ring was found.

[0019] S2: While adjusting the position, it is also necessary to adjust the pressure of the overflow valve and the variable vane pump so that the expansion of the rubber ring can reach the required diameter after the cylinder is activated. Finally, record the value on the pressure gauge. After the position and pressure are adjusted, switch the operation mode to automatic mode, confirm that the expansion rubber ring is in its natural state and that the stroke sensing rod is aligned with the proximity switch on the right wall panel. Then, insert the welded pipe into the expansion mold until it hits the right wall panel of the fixture.

[0020] S3: After the electrical box is powered on, the motor starts. Pressing the start button de-energizes one path of the solenoid directional valve, causing it to close. Hydraulic oil from the cylinder flows back to the valve block from the inlet pipe, and then back to the oil tank from the valve block. Simultaneously, the motor draws hydraulic oil from the oil tank, which is then pressurized by a variable vane pump and delivered to the valve block via the supply pipe through a pressure gauge. At this time, the other path of the solenoid directional valve is activated, and hydraulic oil flows through the relief valve to the return pipe, and then from the return pipe to the cylinder, driving the cylinder spindle to retract to the proximity switch on the left side of the wall panel. The cylinder spindle moves backward, causing the bulging rubber ring to move backward, but this is affected by the limit stop sleeve and the equal diameter sleeve. Due to the displacement limitation of the fixed ring, the bulging rubber ring can only deform radially, which causes the welded pipe sleeved on the outside to expand. When the cylinder spindle is in position, the electromagnetic reversing valve receives the proximity switch signal from the left wall plate, and is energized to conduct the hydraulic oil flow direction change. The hydraulic oil is injected into the cylinder through the oil inlet pipe, and the hydraulic oil flows back to the valve block through the oil return pipe, and then flows back to the oil tank from the valve block. At this time, the cylinder spindle extends until the stroke sensing rod triggers the proximity switch, the expansion mold recovers its deformation, the welded pipe is removed, and the appearance of the expansion point is observed. There should be no cracks or openings. The equipment will stop and wait after completing one cycle of action.

[0021] S4: Before the pipe to be welded is inserted into the expansion mold, the first moving block is moved by the moving module, and the annular cover is moved by the telescopic mechanism, so that the annular cover is fitted onto the outside of the expansion mold. At this time, the baffle abuts against the side wall of the bottom plate. As the first moving block continues to move, the first spring is gradually compressed. At the same time, the distance between the first moving block and the annular cover gradually decreases, which can drive the push block to move through the connecting frame, and push the second moving block to move closer to the fixed block. The third spring is compressed, causing the push pin to disengage from the inclined plane. At this time, the gravity plate can move downward under the action of gravity, and squeeze the hydraulic oil in the oil tank, so that the hydraulic oil can enter the annular cover through the L-shaped pipe, and enter the second sleeve through the fixed pipe. Under the action of hydraulic pressure, the cleaning block... The tube expander abuts against the side wall of the tube expansion mold. Then, the drive motor is started. The rotation of the drive motor drives the rotation of the rubber wheel, which in turn drives the rotating ring through the ring, thereby driving the cleaning block to rotate. This can automatically clean the surface of the tube expansion mold. Similarly, after the welded pipe is inspected, the surface of the welded pipe can also be automatically cleaned, which is more convenient and faster, and ensures the accuracy of subsequent inspections. After cleaning, the first moving block is moved and reset through the moving module. At this time, the first spring gradually resets. At the same time, the push block is moved and reset through the connecting frame. The second moving block can be moved and reset under the action of the third spring, and the push pin abuts against the side wall of the inclined surface, thereby pushing the gravity plate to move and reset upward. After the first spring is reset, the ring cover can be moved and reset.

[0022] S5: When cleaning the expansion mold, the hydraulic oil entering the annular cover can enter the third sleeve through the telescopic tube and the moving tube. Under the action of hydraulic pressure, the conical rod moves away from the third sleeve, and the ball abuts against the side wall of the bulging rubber ring. When the rotating ring rotates, it can drive the ball to roll on the surface of the bulging rubber ring. The vision sensor can detect cracks or openings on its surface. When there are cracks or openings on the surface of the bulging rubber ring, under the action of hydraulic pressure, the ball can insert into the cracks or openings, causing the moving tube to encounter greater resistance when rotating, and causing the moving tube to move closer to the connecting block. The second spring is compressed, and the distance of the moving tube is detected by the distance sensor, which facilitates the detection of cracks or openings on the surface of the bulging rubber ring and ensures the accuracy of subsequent inspection results. Similarly, after the inspection is completed, the vision sensor can inspect the appearance of the expansion area and facilitate the detection of cracks or openings at the expansion area, which is more convenient and faster and can improve the efficiency of inspection.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This device and method for testing the weld strength of corrugated metal pipes utilizes a hydraulic station module to simulate the principle of hydraulic forming of pipes. It replaces liquid-medium forming with the forming of soft, solid rubber. Axial tension is applied, causing the rubber to deform and bulge, which in turn causes deformation of the welded pipe. The weld quality is assessed by calculating the deformation and bulge ratio. In continuous pipe welding, sampling and testing are required after welding a specified length. The equipment only needs initial debugging during the first expansion; subsequent tests in continuous production can be performed directly. Each test, from sampling to completion, takes no more than 5 minutes, making it more convenient and faster than testing I-beams. Furthermore, by reducing the mold size, it can test welded pipes with diameters less than 10mm, expanding the testing range. This equipment is also easier to operate than a dedicated tensile testing machine. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a schematic diagram of the overall structure of the present invention from another perspective;

[0027] Figure 3 is a schematic diagram of the hydraulic station module in this invention;

[0028] Figure 4 is a partial cross-sectional view of the movable guide rod in this invention;

[0029] Figure 5 is a schematic diagram of the cleaning mechanism and the detection mechanism in this invention;

[0030] Figure 6 is a structural schematic diagram of the cleaning mechanism and the detection mechanism in this invention from another perspective;

[0031] Figure 7 is a schematic diagram of the distance sensor in this invention;

[0032] Figure 8 is an enlarged structural diagram of point A in Figure 6.

[0033] In the diagram: 1. Frame; 2. Oil tank; 3. Overflow valve; 4. Valve block; 5. Solenoid valve; 6. Oil supply pipe; 7. Motor; 8. Pressure gauge; 9. Variable vane pump; 10. Oil inlet pipe; 11. Oil return pipe; 12. Electrical box; 13. Switch control box; 14. Hydraulic cylinder; 15. Left wall panel; 16. Hydraulic cylinder spindle; 17. Stroke sensing rod; 18. Proximity switch; 19. Movable guide rod; 20. Limit stop sleeve; 21. Bulbed rubber ring; 2. Equal diameter sleeve; 23. Fixing ring; 24. Right wall panel; 25. Set screw; 26. Base plate; 27. Mounting bracket; 28. Fixing plate; 29. ​​First moving block; 30. Annular cover; 31. Rotating ring; 32. Moving module; 3301. First sleeve rod; 3302. First sleeve tube; 3303. First spring; 3304. Baffle; 3401. Moving tube; 3402. Telescopic tube; 3403. Third sleeve tube; 34 04. Tapered rod; 3405. Ball bearing; 3501. Connecting block; 3502. First T-shaped guide rod; 3503. Second spring; 3504. Mounting hole; 3505. Distance sensor; 3506. U-shaped frame; 3507. Vision sensor; 3601. Oil tank; 3602. Gravity plate; 3603. Second T-shaped guide rod; 3604. L-shaped block; 3605. L-shaped tube; 3701. Ring; 3702. Support plate; 3703, drive motor; 3704, rubber wheel; 3801, push plate; 3802, inclined plane; 3803, second moving block; 3804, push pin; 3805, connecting frame; 3806, push block; 3901, fixing block; 3902, third T-shaped guide rod; 3903, third spring; 4001, fixing tube; 4002, second sleeve; 4003, second sleeve rod; 4004, cleaning block. Detailed Implementation

[0034] 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.

[0035] Please refer to Figures 1-8. This invention provides a weld strength testing device for welded pipes used in metal corrugated pipes, including an electrical box 12 and a switch control box 13 mounted on a frame 1. A base plate 26 is fixedly connected to the top of the frame 1, and a left wall plate 15 and a right wall plate 24 are fixedly connected to the top of the base plate 26. A hydraulic cylinder 14 is fixedly connected to the side wall of the left wall plate 15, and the hydraulic cylinder 14 includes a hydraulic cylinder spindle 16. A movable guide rod 19 is inserted into the side wall of the right wall plate 24, and the movable guide rod 19 is fixed to the end of the hydraulic cylinder spindle 16. A limiting sleeve 20, an expansion rubber ring 21, an equal diameter sleeve 22, and a fixing ring 23 are sequentially fitted onto the side wall of the movable guide rod 19, and a set screw 25 is inserted into the end of the fixing ring 23. The set screw 25 is connected to the end of the movable guide rod 19. The machine is threaded and has a hydraulic station module at the bottom of the frame 1. This module drives the hydraulic cylinder spindle 16 to move. A control mechanism for controlling the travel of the hydraulic cylinder spindle 16 is located on the side wall of the right wall panel 24. By simulating the principle of hydraulic forming of pipes, the liquid medium forming is replaced with soft solid rubber forming. Axial tension is applied to cause the rubber to deform and bulge, thus causing the welded pipe to deform. The weld quality is evaluated by calculating the deformation and bulging ratio. In continuous pipe welding, sampling and testing are required after welding a specified length. This equipment only needs to be debugged during the first expansion; subsequent tests in continuous production can be used directly. Each test, from sampling to completion, takes no more than 5 minutes, making it more convenient and faster than testing I-beams. Furthermore, by reducing the mold size, it can test welded pipes with a diameter less than 10mm, expanding the testing range. This equipment is easier to operate than a dedicated tensile testing machine.

[0036] Please refer to Figure 2 and General 3. The hydraulic station module includes an oil tank 2 fixedly connected to the bottom of the frame 1. A motor 7 and a valve block 4 are fixedly connected to the top of the oil tank 2. A variable vane pump 9 is installed on the motor 7, and a solenoid valve 5 and a relief valve 3 are installed on the valve block 4. The valve block 4 is connected to the variable vane pump 9 through an oil supply pipe 6, and is connected to the oil cylinder 14 through an oil inlet pipe 10 and an oil return pipe 11. A pressure gauge 8 is installed on the side wall of the oil supply pipe 6 to facilitate the movement of the main shaft 16 of the oil cylinder.

[0037] Please refer to Figure 4. The control mechanism is fixedly connected to the mounting bracket 27 on the side wall of the right wall panel 24, and two proximity switches 18 are fixedly connected to the side wall of the mounting bracket 27. A stroke sensing rod 17 is fixedly connected to the side wall of the cylinder spindle 16 to facilitate the control of the stroke of the cylinder spindle 16.

[0038] Please refer to Figures 1, 2, 5 and 6. A fixed plate 28 is fixedly connected to the top of the frame 1. A first moving block 29 is connected to the side wall of the fixed plate 28 through a moving module 32. An annular cover 30 is connected to the side wall of the first moving block 29 through a telescopic mechanism. A rotating ring 31 is rotatably connected inside the annular cover 30 through a drive mechanism. A cleaning mechanism for cleaning the bulging rubber ring 21 and the metal bellows is provided at the end of the rotating ring 31. A detection mechanism for detecting the bulging rubber ring 21 and the metal bellows is also provided at the end of the rotating ring 31.

[0039] The telescopic mechanism includes two first sleeve rods 3301 fixedly connected to the side wall of the first moving block 29, and a first sleeve tube 3302 is sleeved on the side wall of the first sleeve rod 3301. The other end of the first sleeve tube 3302 is fixed to the end of the annular cover 30, and a first spring 3303 is sleeved on the side wall of each first sleeve tube 3302. An L-shaped baffle 3304 is fixedly connected to the bottom of the annular cover 30, which facilitates automatic cleaning of the expansion mold and the surface of the welded pipe, making it more convenient and faster, and ensuring the accuracy of subsequent inspections. It also facilitates the inspection of the appearance of the bulging rubber ring 21 and the expansion of the welded pipe, making it more convenient and faster, and improving the efficiency of inspections.

[0040] Please refer to Figures 6 and 7. The cleaning mechanism includes multiple fixed tubes 4001 fixedly inserted into the end of the rotating ring 31, and multiple second sleeves 4002 are fixedly connected to the side wall of the fixed tubes 4001. A second sleeve rod 4003 is inserted into the second sleeve 4002, and a cleaning block 4004 is fixedly connected to the other end of the second sleeve rod 4003. The cleaning block 4004 is pushed to abut against the surface of the tube expansion mold or the welded pipe by a pushing mechanism. When the rotating ring 31 rotates, the cleaning block 4004 can clean the surface of the tube expansion mold or the welded pipe.

[0041] The detection mechanism includes multiple movable tubes 3401, and each movable tube 3401 is connected to the end of a rotating ring 31 via a reset mechanism. The movable tubes 3401 are fixed to the end of the rotating ring 31 via telescopic tubes 3402. Multiple third sleeves 3403 are fixedly connected to the side walls of the movable tubes 3401. A tapered rod 3404 is inserted into each third sleeve 3403, and a ball bearing 3405 is provided at the end of the tapered rod 3404. A U-shaped frame 3506 is fixedly connected to the side wall of the tapered rod 3404, and a vision sensor 3507 is fixedly inserted into the side wall of the U-shaped frame 3506. The movement of the second sleeve 4003 and the tapered rod 3404 is driven by a pushing mechanism. The moving conical rod 3404 moves away from the third sleeve 3403, causing the ball 3405 to abut against the surface of the bulging rubber ring 21 or the welded pipe expansion. The vision sensor 3507 can detect the appearance of the bulging rubber ring 21 or the welded pipe expansion. When there is a crack or opening in the bulging rubber ring 21 or the welded pipe expansion, under the action of hydraulic pressure, the ball 3405 can be inserted into the crack or opening, causing the moving tube 3401 to experience greater resistance when rotating, and causing the moving tube 3401 to move closer to the connecting block 3501. The second spring 3503 is compressed, and the distance of the moving tube 3401 is detected by the distance sensor 3505.

[0042] Please refer to Figure 7. The reset mechanism includes two first T-shaped guide rods 3502 fixedly connected to the side walls of each moving tube 3401. A connecting block 3501 is sleeved on the side wall of the first T-shaped guide rod 3502. The connecting block 3501 is fixed to the end of the rotating ring 31. A second spring 3503 is sleeved on the side wall of each first T-shaped guide rod 3502. A mounting hole 3504 is opened on the side wall of the connecting block 3501. A distance sensor 3505 is fixedly inserted into the mounting hole 3504, which guides and resets the movement of the moving tube 3401.

[0043] Please refer to Figure 6. The driving mechanism includes a ring 3701 fixedly connected to the side wall of the rotating ring 31, and a support plate 3702 fixedly connected to the top of the annular cover 30. A drive motor 3703 is fixedly connected to the side wall of the support plate 3702, and a rubber wheel 3704 is fixedly connected to the output end of the drive motor 3703. When the drive motor 3703 is started, the rotation of the drive motor 3703 drives the rotation of the rubber wheel 3704, thereby driving the rotating ring 31 to rotate through the ring 3701.

[0044] Please refer to Figures 5, 6, and 8. The pushing mechanism includes an L-shaped tube 3605 fixedly connected to the end of the annular cover 30, and an oil tank 3601 fixedly connected to the upper end of the L-shaped tube 3605. A gravity plate 3602 is slidably connected inside the oil tank 3601, and two symmetrically arranged second T-shaped guide rods 3603 are fixedly connected to the top of the gravity plate 3602. An L-shaped block 3604 is sleeved on the side wall of the second T-shaped guide rod 3603, and the L-shaped block 3604 is connected to the gravity plate 3601. The top of 602 is fixed, and a push plate 3801 is fixedly connected to the top of the gravity plate 3602. The side wall of the push plate 3801 is provided with an inclined surface 3802. The top of the oil tank 3601 is connected to a second moving block 3803 through a reset assembly. A push pin 3804 is fixedly connected to the side wall of the second moving block 3803. A connecting frame 3805 is fixedly connected to the side wall of the first moving block 29, and a push block 3806 is fixedly connected to the top of the connecting frame 3805. The first moving block 29 is moved by the moving module 32, and the annular cover 30 is moved by the telescopic mechanism, so that the annular cover 30 is fitted on the outside of the expansion tube mold. At this time, the baffle 3304 abuts against the side wall of the bottom plate 26. When the first moving block 29 continues to move, the first spring 3303 is gradually compressed. At the same time, the distance between the first moving block 29 and the annular cover 30 gradually decreases, and the push block 3806 can be moved by the connecting frame 3805, and the second moving block 3803 is pushed to move closer to the fixed block 3901. The third spring 3903 is compressed, so that the push pin 3804 is disengaged from the inclined surface 3802. At this time, the gravity plate 3602 can move downward under the action of gravity and squeeze the hydraulic oil in the oil tank 3601, so that the hydraulic oil can enter the annular cover 30 through the L-shaped tube 3605, and can push the second sleeve rod 4003 and the conical rod 3404 to move.

[0045] Please refer to Figure 8. The reset assembly includes a fixing block 3901 fixedly connected to the top of the oil reservoir 3601. Two third T-shaped guide rods 3902 are inserted into the side wall of the fixing block 3901. One end of the third T-shaped guide rod 3902 is fixed to the side wall of the second moving block 3803. A third spring 3903 is sleeved on the side wall of each third T-shaped guide rod 3902, which guides and resets the movement of the second moving block 3803.

[0046] A method for testing the weld strength of welded pipes for metal corrugated pipes includes the following steps:

[0047] S1: When testing welded pipes with an inner diameter of 30mm and a wall thickness of 0.12mm, 68# anti-wear hydraulic oil was used as the pressure medium. First, the electrical box (12) inside the frame (1) was powered on. Then, the operation mode was set to manual in the switch control box (13). The forward and backward stroke positions of the cylinder 14 and the proximity switch 18 were adjusted by the jog button. The limit position of the return stroke of the cylinder spindle 16 was when the outer diameter deformation of the bulging rubber ring 21 reached 40%. The limit position of the extension of the cylinder spindle 16 was when no deformation was found in the bulging rubber ring 21.

[0048] S2: While adjusting the position, it is also necessary to adjust the pressure of the overflow valve 3 and the variable vane pump 9 so that the expansion of the rubber ring 21 can reach the required diameter after the cylinder 14 is activated. Finally, record the value on the pressure gauge 8. After the position and pressure are adjusted, switch the operation mode to automatic mode, confirm that the expansion rubber ring 21 is in the natural state and that the stroke sensing rod 17 is aligned with the proximity switch 18 on the right wall plate 24. Then, insert the welded pipe into the expansion mold until it hits the right wall plate 24 of the tooling.

[0049] S3: After the electrical box 12 is powered on, the motor 7 starts. Pressing the start button de-energizes the solenoid directional valve 5, closing one side. The hydraulic oil in the cylinder 14 flows back to the valve block 4 from the inlet pipe 10, and then back to the oil tank 2 from the valve block 4. At the same time, the motor 7 draws hydraulic oil from the oil tank 2, which is then pressurized by the variable vane pump 9 and delivered to the valve block 4 via the supply pipe 6 through the pressure gauge 8. At this time, the other path of the solenoid directional valve is opened, and the hydraulic oil flows through the overflow valve 3 to the return pipe 11, and then from the return pipe 11 to the cylinder 14, driving the cylinder main shaft 16 to retract to the proximity switch 18 on the left side of the wall panel. The cylinder main shaft 16 moves backward, causing the bulging rubber ring 21 to move backward, but it is limited by the limit sleeve 20. The displacement restriction of the equal diameter sleeve 22 and the fixed ring 23 means that the bulging rubber ring 21 can only deform radially, which causes the welded pipe sleeved on the outside to expand. When the cylinder spindle 16 is in position, the electromagnetic reversing valve 5 receives the proximity switch signal 18 at the left wall plate 15, and is energized to conduct the hydraulic oil flow direction change. The hydraulic oil is injected into the cylinder 14 through the oil inlet pipe 10, and the hydraulic oil flows back to the valve block 4 through the oil return pipe 11, and then flows back to the oil tank 2 from the valve block 4. At this time, the cylinder spindle 16 extends until the stroke sensing rod 17 triggers the proximity switch 18, the expansion mold recovers its deformation, the welded pipe is removed, and the appearance of the expansion point is observed. There should be no cracks or openings. The equipment will stop and wait after completing one cycle of action.

[0050] S4: Before the tube to be welded is inserted into the tube expansion mold, the first moving block 29 is moved by the moving module 32, and the annular cover 30 is moved by the telescopic mechanism, so that the annular cover 30 is fitted onto the outside of the tube expansion mold. At this time, the baffle 3304 abuts against the side wall of the base plate 26. When the first moving block 29 continues to move, the first spring 3303 is gradually compressed. At the same time, the distance between the first moving block 29 and the annular cover 30 gradually decreases, which can drive the pushing block 3 through the connecting frame 3805. 806 moves, pushing the second moving block 3803 towards the fixed block 3901. The third spring 3903 is compressed, causing the push pin 3804 to disengage from the inclined plane 3802. At this time, the gravity plate 3602 can move downward under the action of gravity, squeezing the hydraulic oil in the oil tank 3601, so that the hydraulic oil can enter the annular cover 30 through the L-shaped pipe 3605, and enter the second sleeve 4002 through the fixed pipe 4001. Under the action of hydraulic pressure, The cleaning block 4004 abuts against the side wall of the tube expansion mold. Then, the drive motor 3703 is started. The rotation of the drive motor 3703 drives the rotation of the rubber wheel 3704, which in turn drives the rotating ring 31 to rotate through the ring 3701, thereby driving the cleaning block 4004 to rotate. This can automatically clean the surface of the tube expansion mold. Similarly, after the welded pipe is inspected, the surface of the welded pipe can also be automatically cleaned, which is more convenient and faster, and ensures the accuracy of subsequent inspections. After cleaning, the first moving block 29 is moved and reset through the moving module 32. At this time, the first spring 3303 gradually resets. At the same time, the push block 3806 is moved and reset through the connecting frame 3805. The second moving block 3803 can be moved and reset under the action of the third spring 3903, and the push pin 3804 abuts against the side wall of the inclined surface 3802, thereby pushing the gravity plate 3602 to move and reset upward. After the first spring 3303 is reset, it can drive the annular cover 30 to move and reset.

[0051] S5: When cleaning the expansion mold, the hydraulic oil entering the annular cover 30 can enter the third sleeve 3403 through the telescopic tube 3402 and the moving tube 3401. Under the action of hydraulic pressure, the tapered rod 3404 moves away from the third sleeve 3403, and the ball 3405 abuts against the side wall of the bulging rubber ring 21. When the rotating ring 31 rotates, it can drive the ball 3405 to roll on the surface of the bulging rubber ring 21. The visual sensor 3507 can detect cracks or openings on its surface. Furthermore, when there are cracks or openings on the surface of the bulging rubber ring 21, under the action of hydraulic pressure, it can... This allows the ball bearing 3405 to insert into the crack or opening, causing the moving tube 3401 to experience greater resistance when rotating, and causing the moving tube 3401 to move closer to the connecting block 3501. The second spring 3503 is compressed, and the distance to the moving tube 3401 is detected by the distance sensor 3505, which facilitates the detection of cracks or openings on the surface of the bulging rubber ring 21, ensuring the accuracy of subsequent detection results. Similarly, after the detection is completed, the vision sensor 3507 can detect the appearance of the expansion area, and facilitate the detection of cracks or openings at the expansion area, making it more convenient and faster, and improving the efficiency of detection.

[0052] When testing a welded pipe with an inner diameter of 30mm, it is necessary to design and process a set of limiting sleeves 20 with an outer diameter of 29.5mm and a length of 500mm for each section, bulging rubber rings 21, equal diameter sleeves 22, and fixing rings 23 with an outer diameter of 29.5mm.

[0053] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0054] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A weld strength testing device for metal corrugated pipes, comprising an electrical box (12) and a switch control box (13) mounted on a frame (1), characterized in that: The top of the frame (1) is fixedly connected to a base plate (26), and the top of the base plate (26) is fixedly connected to a left wall plate (15) and a right wall plate (24); the side wall of the left wall plate (15) is fixedly connected to a hydraulic cylinder (14), and the hydraulic cylinder (14) includes a hydraulic cylinder spindle (16); the side wall of the right wall plate (24) is provided with a movable guide rod (19), and the movable guide rod (19) is fixed to the end of the hydraulic cylinder spindle (16); the side wall of the movable guide rod (19) is sequentially fitted with... The frame (1) is equipped with a limit stop sleeve (20), an expansion rubber ring (21), an equal diameter sleeve (22), and a fixing ring (23). A hydraulic station module is installed at the bottom of the frame (1), which drives the cylinder spindle (16) to move. A control mechanism for controlling the travel of the cylinder spindle (16) is installed on the side wall of the right wall panel (24). A fixing plate (28) is fixedly connected to the top of the frame (1), and the side wall of the fixing plate (28) is connected to the moving module. Block (32) is connected to a first movable block (29), and the side wall of the first movable block (29) is connected to an annular cover (30) through a telescopic mechanism. Inside the annular cover (30), a rotating ring (31) is rotatably connected through a driving mechanism. The end of the rotating ring (31) is provided with a cleaning mechanism for cleaning the bulging rubber ring (21) and the metal bellows. The end of the rotating ring (31) is provided with a detection mechanism for detecting the bulging rubber ring (21) and the metal bellows. The telescopic mechanism includes two first sleeve rods (3301) fixedly connected to the side wall of the first movable block (29), and the side wall of the first sleeve rod (3301) is fitted with a first sleeve (3302). The other end of the first sleeve (3302) is fixed to the end of the annular cover (30), and the side wall of each first sleeve (3302) is fitted with a first spring (3303). The bottom of the annular cover (30) is fixedly connected with an L-shaped baffle (3304).

2. The weld strength testing device for metal corrugated pipes according to claim 1, characterized in that: The hydraulic station module includes an oil tank (2) fixedly connected to the bottom of the frame (1), and a motor (7) and a valve block (4) fixedly connected to the top of the oil tank (2). A variable vane pump (9) is installed on the motor (7), and a solenoid valve (5) and an overflow valve (3) are installed on the valve block (4). The valve block (4) is connected to the variable vane pump (9) through the oil supply pipe (6), and the valve block (4) is connected to the oil cylinder (14) through the oil inlet pipe (10) and the oil return pipe (11). A pressure gauge (8) is installed on the side wall of the oil supply pipe (6).

3. The weld strength testing device for metal corrugated pipes according to claim 1, characterized in that: The control mechanism is fixedly connected to the mounting bracket (27) on the side wall of the right wall panel (24), and two proximity switches (18) are fixedly connected to the side wall of the mounting bracket (27), and a stroke sensing rod (17) is fixedly connected to the side wall of the cylinder spindle (16).

4. The weld strength testing device for metal corrugated pipes according to claim 1, characterized in that: The cleaning mechanism includes multiple fixed tubes (4001) fixedly inserted into the end of the rotating ring (31), and multiple second sleeves (4002) are fixedly connected to the side wall of the fixed tubes (4001). A second sleeve rod (4003) is inserted into the second sleeve (4002), and a cleaning block (4004) is fixedly connected to the other end of the second sleeve rod (4003). The detection mechanism includes multiple moving tubes (3401), and the moving tubes (3401) are connected to the end of the rotating ring (31) through a reset mechanism. The moving tubes (3401) are connected to the end of the rotating ring (31) through a telescopic tube (340). 2) The end of the rotating ring (31) is fixed, and the side wall of the moving tube (3401) is fixedly connected with a plurality of third sleeves (3403). A tapered rod (3404) is inserted in the third sleeve (3403), and a ball bearing (3405) is provided at the end of the tapered rod (3404). A U-shaped frame (3506) is fixedly connected to the side wall of the tapered rod (3404), and a vision sensor (3507) is fixedly inserted in the side wall of the U-shaped frame (3506). The movement of the second sleeve (4003) and the tapered rod (3404) is driven by a pushing mechanism.

5. The weld strength testing device for metal corrugated pipes according to claim 4, characterized in that: The reset mechanism includes two first T-shaped guide rods (3502) fixedly connected to the side wall of each moving tube (3401), and a connecting block (3501) is sleeved on the side wall of the first T-shaped guide rod (3502). The connecting block (3501) is fixed to the end of the rotating ring (31), and a second spring (3503) is sleeved on the side wall of each first T-shaped guide rod (3502). The side wall of the connecting block (3501) is provided with a mounting hole (3504), and a distance sensor (3505) is fixedly inserted in the mounting hole (3504).

6. The weld strength testing device for welded pipes of metal corrugated pipes according to claim 5, characterized in that: The driving mechanism includes a ring (3701) fixedly connected to the side wall of the rotating ring (31), and a support plate (3702) fixedly connected to the top of the annular cover (30). A drive motor (3703) is fixedly connected to the side wall of the support plate (3702), and a rubber wheel (3704) is fixedly connected to the output end of the drive motor (3703).

7. The weld strength testing device for welded pipes of metal corrugated pipes according to claim 4, characterized in that: The pushing mechanism includes an L-shaped tube (3605) fixedly connected to the end of the annular cover (30), and an oil tank (3601) is fixedly connected to the upper end of the L-shaped tube (3605). A gravity plate (3602) is slidably connected inside the oil tank (3601), and two symmetrically arranged second T-shaped guide rods (3603) are fixedly connected to the top of the gravity plate (3602). An L-shaped block (3604) is sleeved on the side wall of the second T-shaped guide rod (3603), and the L-shaped block (3604) is connected to the top of the gravity plate (3602). The gravity plate (3602) is fixedly connected to the top of a push plate (3801), and the side wall of the push plate (3801) is provided with an inclined surface (3802). The top of the oil tank (3601) is connected to a second moving block (3803) through a reset assembly, and the side wall of the second moving block (3803) is fixedly connected to a push pin (3804). The side wall of the first moving block (29) is fixedly connected to a connecting frame (3805), and the top of the connecting frame (3805) is fixedly connected to a push block (3806).

8. The weld strength testing device for welded pipes of metal corrugated pipes according to claim 7, characterized in that: The reset assembly includes a fixing block (3901) fixedly connected to the top of the oil reservoir (3601), and two third T-shaped guide rods (3902) are inserted into the side wall of the fixing block (3901). One end of the third T-shaped guide rod (3902) is fixed to the side wall of the second moving block (3803), and a third spring (3903) is sleeved on the side wall of each third T-shaped guide rod (3902).

9. The weld strength testing device for welded pipes of metal corrugated pipes according to claim 1, characterized in that: The end of the fixed ring (23) is provided with a set screw (25), which is threaded to the end of the movable guide rod (19).

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