Detection device for welded joint of metal pipeline

Abstract

The invention discloses a detection device for a metal pipeline welded joint, a rolling frame and a hollow shaft torque motor are mounted on a base of the detection device, a detection mechanism is mounted on the inner wall of a rotor of the hollow shaft torque motor, a shell of the detection mechanism is connected to the inner wall of the rotor through an elastic telescopic rod, and a detector is mounted in the shell through a spring set. Two gravity counterweight sets for balancing the weight of the detector are installed in the shell, the elastic telescopic rod can push the shell to abut against a to-be-detected steel pipe, the spring set can push the detector and enable the detection end of the ultrasonic probe to abut against the outer wall of the to-be-detected steel pipe with set pressure, and the thrust of the elastic telescopic rod is larger than the bounce of the spring set. The to-be-detected steel pipe is moved through rotation of the supporting rollers, abrasion of the supporting rollers is reduced, the service life of the detection device is prolonged, the detection mechanism is driven by the hollow shaft torque motor to move, instability of the to-be-detected steel pipe is avoided, and the safety of equipment and detection personnel is guaranteed.

Description

Technical Field

[0001] The present invention relates to a detection device for a welded joint of a metal pipe. Background Art

[0002] To ensure the welding quality, ultrasonic detection needs to be carried out on the welded joint of the metal pipe. To improve the detection efficiency, a detection rack is usually set up. The detection rack is usually provided with two rotating rollers for supporting the metal pipe. The metal pipe is placed on the two rotating rollers, and then the rotating rollers are rotated to drive the metal pipe to rotate. The ultrasonic detector fixed on the detection rack detects the welded part. Since the axis of the rotating roller is parallel to the axis of the metal pipe, a lifting vehicle such as a forklift is needed to place the metal pipe on the detection rack along the radial direction of the rotating roller.

[0003] When placing the metal pipe on the detection rack, the metal pipe cannot be arranged in place at one time and needs secondary positioning. When performing secondary positioning, the metal pipe needs to be pushed axially. This is relatively easy for the operation of small pipes, but when pushing large pipes, a large thrust is required, which not only easily causes wear to the rotating rollers, but also easily damages the supporting structure of the rotating rollers, affecting the safe use and service life of the detection rack. In addition, when the detection is completed, when removing the metal pipe from the detection rack, the metal pipe needs to be pushed axially first, and when approximately half of the length of the metal pipe leaves the detection rack, a device such as a forklift is used to completely remove the metal pipe from the detection rack, which further increases the wear of the rotating rollers.

[0004] During the detection process, since the rotation of the rotating roller is used to drive the rotation of the metal pipe, the metal pipe is always in an unstable state during the detection process and is easily dropped from the detection rack due to operation errors, causing damage to the equipment and injury to the detection personnel. Summary of the Invention

[0005] To solve the above problems, the present application proposes a detection device for a welded joint of a metal pipe, which includes a base, a plurality of rolling racks installed on the base along the first axis direction, and a hollow shaft torque motor. Each rolling rack has a rotatable support roller, and the support roller extends along the second axis direction; the central axis of the hollow shaft torque motor extends along the first axis direction, and the hollow shaft torque motor includes a stator and a rotor rotatably installed inside the stator. The stator is installed on the base through a lifting mechanism; both the first axis direction and the second axis direction extend along the horizontal direction and are perpendicular to each other;

[0006] A detection mechanism is installed on the inner wall of the mover. One end of the detection mechanism extends along the radial direction of the mover towards the center of the mover and does not exceed the central axis of the mover. The detection mechanism includes a housing, a detector, and an elastic telescopic rod. The detector has an ultrasonic probe. The two ends of the housing in the radial direction of the mover are respectively formed as a mounting end and an outlet end. The mounting end is installed on the inner wall of the mover through the elastic telescopic rod. The detector is inserted into the inner cavity of the housing, and the detector is installed on the mounting end through a spring group. The spring group includes at least one first spring. The detection end of the ultrasonic probe extends towards the direction away from the mounting end and can extend out of the outlet end. Two gravity balancing groups are installed in the housing. The two gravity balancing groups are respectively a first gravity balancing group and a second gravity balancing group. The first gravity balancing group includes at least one first gravity counterweight, and the second gravity balancing group includes at least one second gravity counterweight. The detector can reciprocate along the radial direction of the mover. When the first spring is in the natural state, in the radial direction of the mover, the end face of the detection end of the ultrasonic probe extends out of the outlet end of the housing.

[0007] A first external force can push the detector radially outwards along the mover, causing the detector to retract into the housing and compress the first spring. After the first external force is withdrawn, the first spring can push the detector radially inwards along the mover and make the end face of the detection end of the ultrasonic probe extend out of the housing.

[0008] The elastic telescopic rod can push the housing radially inwards along the mover, causing the housing to press against the outer wall of the steel pipe to be measured. When the elastic telescopic rod pushes the housing radially inwards along the mover and makes the housing press against the outer wall of the steel pipe to be measured, the first spring can push the detector and make the detection end of the ultrasonic probe press against the outer wall of the steel pipe to be measured with a set pressure. At this time, the thrust of the elastic telescopic rod is greater than the total rebound force of all the first springs.

[0009] The detection mechanism can rotate synchronously with the rotation of the mover. When the detection mechanism is above the central axis of the mover, the first gravity balancing group balances the weight of the detector. When the detection mechanism is below the central axis of the mover, the second gravity balancing group balances the weight of the detector.

[0010] When this embodiment works, first, according to the outer diameter of the steel pipe to be measured, the height of the hollow shaft torque motor is adjusted by using it as a lifting mechanism, so that the central axis of the rotor is collinear with the central axis of the steel pipe to be measured. Then, the elastic telescopic rod is pressed to shorten its length, and the housing and the detector are moved outward along the radial direction of the rotor to avoid the steel pipe to be measured touching the detector when passing through the inner cavity of the rotor and damaging the detector. Then, a lifting device such as a forklift is used to support one end of the steel pipe to be measured at the set position of the support roller on the outermost side in the first axis direction. Then, the steel pipe to be measured is moved along the first axis direction and passed through the inner cavity of the rotor until the weld on the steel pipe to be measured is directly opposite to the ultrasonic probe, and the movement of the steel pipe to be measured is stopped.

[0011] Release the pressing on the lever, so that the length of the elastic telescopic rod elongates, and push the housing and the detector to move toward the center of the rotor along the radial direction of the rotor, so that the housing presses against the outer wall of the steel pipe to be measured. Under the push of the first spring, the ultrasonic probe of the detector presses against the weld of the steel pipe to be measured with a set pressure. Start the hollow shaft torque motor to make the rotor drive the detector to rotate around the steel pipe to be measured and detect the weld.

[0012] After a period of use, the elasticity of the first spring will decrease, affecting the detection accuracy. It is necessary to regularly detect its elasticity to ensure that when the housing presses against the outer wall of the steel pipe to be measured, the ultrasonic probe can press against the weld of the steel pipe to be measured with a set pressure, and this set pressure is the use pressure of the selected ultrasonic probe. With the support of the housing, the influence of the second spring on the use pressure of the ultrasonic probe is avoided.

[0013] This application uses the rotation of the support roller to move the steel pipe to be measured, which can greatly reduce the wear of the support roller and improve the service life of the detection device. This application uses a hollow shaft torque motor to drive the detection mechanism to move around the steel pipe to be measured. After the steel pipe to be measured is placed at the set position of the rolling frame, during the whole detection process of the weld, it is not necessary to rotate the steel pipe to be measured, avoiding the instability of the steel pipe to be measured, thus avoiding the falling of the steel pipe to be measured and ensuring the safety of the equipment and the detection personnel.

[0014] Specifically, the first gravity counterweight includes a first partition and first counterweight balls. The first partition is fixed on the inner wall of the housing. A first roller is provided outside the first partition in the radial direction of the mover. One end of the first traction rope is fixed on the detector, and the other end of the first traction rope bypasses the first roller and is fixed on the first counterweight ball after freely passing through the first partition. When the detector reciprocates in the radial direction of the mover, the fixed point of the first traction rope on the detector and the first counterweight ball are always located inside the first partition in the radial direction of the mover. The total weight of all the first counterweight balls is equal to the weight of the detector. When the first counterweight ball is located below the first partition, there is a distance between the first counterweight ball and the first partition, and all the weight of the first counterweight ball is transmitted to the detector through the first traction rope. When the first counterweight ball is located above the first partition, the first counterweight ball is supported on the first partition, and the first traction rope is in a slack state.

[0015] The second gravity counterweight includes a second partition and second counterweight balls. The second partition is fixed on the inner wall of the housing. A second roller is provided inside the second partition in the radial direction of the mover. One end of the second traction rope is fixed on the detector, and the other end of the second traction rope bypasses the second roller and is fixed on the second counterweight ball after freely passing through the second partition. When the detector reciprocates in the radial direction of the mover, the fixed point of the second traction rope on the detector and the second counterweight ball are always located outside the second partition in the radial direction of the mover. The total weight of all the second counterweight balls is equal to the weight of the detector. When the second counterweight ball is located below the second partition, there is a distance between the second counterweight ball and the second partition, and all the weight of the second counterweight ball is transmitted to the detector through the second traction rope. When the second counterweight ball is located above the second partition, the second counterweight ball is supported on the second partition, and the second traction rope is in a slack state.

[0016] When the detection mechanism is located at the top of the mover, the second gravity counterweight group is located above the first gravity counterweight group. At this time, the second counterweight ball is supported on the second partition, and the second traction rope is in a slack state. The second counterweight ball loses the traction on the detector. The first counterweight ball is located below the first partition, and all the weight of the first counterweight ball is transmitted to the detector through the first traction rope to balance the weight of the detector. As the mover rotates, when the detection mechanism is located at the bottom of the mover, the first gravity counterweight group is located above the second gravity counterweight group. At this time, the first counterweight ball is supported on the first partition, and the first traction rope is in a slack state. The first counterweight ball loses the traction on the detector. The second counterweight ball is located below the second partition, and all the weight of the second counterweight ball is transmitted to the detector through the second traction rope to balance the weight of the detector. Thus, during the rotation of the mover, the influence of the weight of the detector on the first spring can be eliminated through the alternating action of the first counterweight group and the second counterweight group, so that the pressure transmitted by the spring to the detector is the pressure generated by the ultrasonic probe on the steel pipe to be measured.

[0017] Furthermore, in order to avoid the first counterweight ball or the second counterweight ball from shaking randomly and causing adverse effects on the detection data, the first gravity counterweight device also includes a first pressure plate, which is fixed on the inner wall of the shell, and a first limiting cylinder is arranged on the inner side of the radial direction of the mover of the first pressure plate, a first partition is fixed in the first limiting cylinder, and the first counterweight ball is movably placed in the first limiting cylinder; the second gravity counterweight device also includes a second pressure plate, which is fixed on the inner wall of the shell, and a second limiting cylinder is arranged on the outer side of the radial direction of the mover of the second pressure plate, a second partition is fixed in the first limiting cylinder, and the second counterweight ball is movably placed in the second limiting cylinder. Preferably, the inner diameter of the first limiting cylinder is 0.5-1.5mm larger than the outer diameter of the first counterweight ball, and the inner diameter of the second limiting cylinder is 0.5-1.5mm larger than the outer diameter of the second counterweight ball.

[0018] Furthermore, in order to avoid the loss of the first counterweight ball or the second counterweight ball after the first traction rope or the second traction rope breaks, a first cylinder cover is detachably installed at one end on the inner side of the radial direction of the mover of the first limiting cylinder, and the first counterweight ball has no contact with the cover plate of the first cylinder cover; a second cylinder cover is detachably installed at one end on the outer side of the radial direction of the mover of the second limiting cylinder, and the second counterweight ball has no contact with the cover plate of the second cylinder cover.

[0019] When the first traction rope or the second traction rope breaks, the first counterweight ball and the second counterweight ball are retained in the corresponding first limiting cylinder or the second limiting cylinder, avoiding the loss of the first counterweight ball and the second counterweight ball, and facilitating the subsequent maintenance of the detection device.

[0020] Furthermore, in order to reduce the friction between the housing and the steel pipe to be tested, a universal ball is provided at one end of the housing on the inner side of the mover in the radial direction.

[0021] Furthermore, in order to prevent the detector from shaking freely in the shell, a plurality of first guide rods are arranged inside the shell. The plurality of first guide rods are arranged at intervals around the detector. The guide rods extend radially along the mover. Corresponding to each first guide rod, a guide block is provided on the outer wall of the detector, and a guide hole is provided on the guide block. One end of the first guide rod is fixed on the shell, and the other end of the first guide rod slides through the guide hole of the corresponding guide block.

[0022] Furthermore, in order to prevent the first guide rod from falling out of the guide hole and causing the detector to lose control, an anti-falling nut is screwed on the inner side end of the first guide rod in the radial direction of the mover.

[0023] Specifically, the elastic telescopic rod includes a connecting rod, a sliding rod and a second spring, the connecting rod extends in the radial direction of the mover, one end of the connecting rod is detachably connected to the inner wall of the mover, the other end of the connecting rod is slidably plugged with the sliding rod, and the end of the connecting rod away from the sliding rod is fixed to the housing of the detection mechanism;

[0024] A first flange is provided on the outer peripheral surface of the connecting rod, and a second flange is provided on the outer peripheral surface of the sliding rod. The second spring is sleeved on the connecting rod and located between the first flange and the second flange. Both ends of the second spring are respectively pressed against the first flange and the second flange. The second guide rod freely passes through the first flange and the second flange and then a limit bolt is screwed thereon to connect the connecting rod and the sliding rod together. When a second external force pushes the sliding rod outward in the radial direction of the mover, the sliding rod can move outward in the radial direction of the mover and compress the second spring. When the second external force is withdrawn, the second spring can push the sliding rod inward in the radial direction of the mover to make the sliding rod move inward in the radial direction of the mover. The second spring is configured such that when the ultrasonic probe is pressed against the outer wall of the steel pipe to be measured, the thrust of the second spring is greater than the total rebounding force of all the first springs.

[0025] This design can smoothly drive the housing and the detector to reciprocate in the radial direction of the mover by using the elastic telescopic rod, and use the second spring to tightly press the housing against the outer wall of the steel pipe to be measured, so that the ultrasonic probe can be pressed against the outer wall of the steel pipe to be measured by setting the pressure of the first spring gauge.

[0026] Further, to facilitate compressing the second spring so that the housing moves outward in the radial direction of the mover, an adjusting mechanism is further provided. The adjusting mechanism includes a fulcrum rod and a lever. The fulcrum rod is fixed on the inner wall of the mover. A fulcrum through hole is provided on the fulcrum rod. One end of the lever is connected to the sliding rod, and the other end of the lever freely passes through the fulcrum through hole and forms a handle.

[0027] Further, to prevent the steel pipe to be measured from shaking on the support roller and deviating from its initial position, a V-shaped annular groove is provided on the support roller. The annular groove is used to place the steel pipe to be measured. When the steel pipe to be measured is placed in the annular groove, the central axis of the steel pipe to be measured and the central axis of the mover are located in the same vertical plane. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0029] Figure 2 is Figure 1 the view in the A-A direction in

[0030] Figure 3 is a schematic structural diagram of the detection mechanism.

[0031] Figure 4 is a schematic structural diagram of the lever.

[0032] Figure 5 is Figure 4 the top view of Detailed Embodiment

[0033] Refer to Figures 1-5 As shown in the attached drawings, the direction of the first arrow X in the drawings indicates the first axis direction, and the direction of the second arrow Y indicates the second axis direction. Both the first axis direction and the second axis direction extend along the horizontal direction and are perpendicular to each other. The following describes the detection device for the welded joint of the metal pipe in the present application. The detection device includes a base 11, six rolling frames 20 installed on the base along the first axis direction, and a hollow shaft torque motor 30. Along the first axis direction, the six rolling frames are respectively arranged on opposite sides of the hollow shaft torque motor, that is, three rolling frames are respectively arranged on both sides of the hollow shaft torque motor in the first axis direction. There is no special requirement for the specific number of rolling frames, as long as it can stably support the steel pipe to be measured.

[0034] Each rolling frame 20 includes a bracket and a support roller 22. The bracket includes two support plates 21 arranged at intervals along the second axis direction and extending along the vertical direction. The support plates 21 are fixed to the base by bolts. In the attached drawings, the bolts for installing the support plates are not shown. The support roller 22 extends along the second axis direction and is rotatably installed on the two support plates through a rotating shaft. An annular groove 221 is provided in the middle part of the axial direction of the support roller. The generatrix 222 of the annular groove 221 is V-shaped, and the steel pipe 100 to be measured can be supported in the annular groove to be stably held on the support roller.

[0035] Along the first axis direction, the rolling frames 20 are successively called the first rolling frame 201, the second rolling frame 202, the third rolling frame 203, the fourth rolling frame 204, the fifth rolling frame 205, and the sixth rolling frame 206. The steel pipe 100 to be measured is placed on each rolling frame along the direction from the first rolling frame 201 to the sixth rolling frame 206. A driving motor 23 is fixedly installed on the outer wall of one support plate of the first rolling frame 201, and the driving shaft of the driving motor 23 is connected to the rotating shaft of the support roller. In Figure 1 it, the direction of the third arrow S indicates the moving direction when the steel pipe to be measured is placed on the rolling frame.

[0036] The central axis of the hollow shaft torque motor 30 extends along the first axis direction. The hollow shaft torque motor 30 includes a stator 32 and a rotor 31 rotatably installed inside the stator 32. The hollow shaft torque motor 30 is an existing mature technology, and its specific structure will not be elaborated here. It can be prepared according to the existing technology.

[0037] The stator 32 is installed on the base 11 through a lifting mechanism 12. The lifting mechanism also adopts the existing technology. Specifically, in this embodiment, the lifting mechanism 12 specifically adopts a hydraulic piston cylinder. It can be understood that in other embodiments, the lifting mechanism can also adopt piston cylinders such as electric piston cylinders and pneumatic piston cylinders, or similar lifting mechanisms such as mechanical jacks.

[0038] When the steel pipe to be measured is placed in the annular groove, the central axis of the steel pipe to be measured and the central axis of the rotor are in the same vertical plane. By adjusting the height of the hollow shaft torque motor through the lifting mechanism, the central axis of the rotor can be made collinear with the central axis of the steel pipe to be measured.

[0039] A detection mechanism 400 is installed on the inner wall of the rotor 31. The detection mechanism includes a housing 40, a detector 410 and an elastic telescopic rod 50. The detector 410 includes an ultrasonic probe 411. One end of the detection mechanism extends radially toward the center of the rotor and does not exceed the central axis of the rotor.

[0040] The housing includes a cylindrical shell 41 extending in the radial direction of the rotor and an end plate 42 detachably installed on the outer side of the shell 41 in the radial direction of the rotor by bolts. One end of the shell 41 on the inner side in the radial direction of the rotor is open. For ease of description, the end of the housing with the end plate is called the installation end 401, and the open end of the housing is called the outlet end 402, that is, the two ends of the housing in the radial direction of the rotor are respectively formed as the installation end and the outlet end.

[0041] A reinforcing plate 43 is provided on the side of the end plate facing away from the shell. The reinforcing plate 43 is fixedly installed on the inner wall of the rotor through the elastic telescopic rod 50, that is, the installation end is installed on the inner wall of the rotor through the elastic telescopic rod.

[0042] The detector 410 is inserted into the inner cavity of the housing 40, and the detector is installed on the inner wall of the end plate through six first springs 48. The detection end of the ultrasonic probe extends away from the installation end and can extend out of the outlet end. The six first springs 48 together form a spring group.

[0043] Two gravity counterweight groups are installed in the housing. The two gravity counterweight groups are the first gravity counterweight group 610 and the second gravity counterweight group 620 respectively. The first gravity counterweight group includes four first gravity counterweights 601, and the second gravity counterweight group includes four second gravity counterweights 602.

[0044] In this application, the structures of the four first gravity counterweights 601 are the same. Each first gravity counterweight 601 includes a first bearing plate 61, a first partition plate 64 and a first counterweight ball 65. The first bearing plate 61 is fixed on the inner wall of the housing. A first limiting cylinder 62 is welded on the inner side of the first bearing plate 61 in the radial direction of the rotor. The first partition plate 64 is welded in the first limiting cylinder. A first roller 66 is rotatably installed between the first partition plate and the first bearing plate 61, and the rotating shaft of the first roller is installed on the first limiting cylinder.

[0045] A first rope-passing hole is formed in the first partition plate. One end of the first towing rope 67 is fixed to the outer wall of the detector. The other end of the first towing rope 67 bypasses the first roller and is freely passed through the first rope-passing hole and then fixed to the first counterweight ball. The first counterweight ball is movably placed in the first limiting cylinder. When the detector reciprocates in the radial direction of the mover, the fixed point of the first towing rope on the detector and the first counterweight ball are always located inside the mover radial direction of the first partition plate. To facilitate the passing of the first towing rope, a first notch for the first towing rope to pass through is provided on the cylinder wall of the first limiting cylinder. Of course, in another embodiment, the first notch can also be replaced with a first through hole. The inner diameter of the first limiting cylinder is 1 mm larger than the outer diameter of the first counterweight ball.

[0046] When the detector reciprocates in the radial direction of the mover, the fixed point of the first towing rope on the detector and the first counterweight ball are always located inside the mover radial direction of the first partition plate. The total weight of all the first counterweight balls is equal to the weight of the detector.

[0047] A first cylinder cover 63 is detachably installed at one end inside the mover radial direction of the first limiting cylinder by means of threads. The first counterweight ball has no contact with the cover plate of the first cylinder cover.

[0048] When the first counterweight ball is located below the first partition plate, there is a distance between the first counterweight ball and the first partition plate, and all the weight of the first counterweight ball is transmitted to the detector through the first towing rope; when the first counterweight ball is located above the first partition plate, the first counterweight ball supports on the first partition plate, and the first towing rope is in a slack state.

[0049] The structures of the four second gravity counterweight devices 602 are the same. Each second gravity counterweight device 602 includes a second bearing plate 611, a second partition plate 641, and a second counterweight ball 651. The second bearing plate 611 is fixed to the inner wall of the housing. A second limiting cylinder 621 is welded on the outer side of the second bearing plate 611 in the mover radial direction. The second partition plate 641 is welded inside the second limiting cylinder. A second roller 661 is rotatably installed between the second partition plate and the second bearing plate 611. The rotating shaft of the second roller is installed on the second limiting cylinder.

[0050] A second rope-passing hole is formed in the second partition plate. One end of the second towing rope 671 is fixed to the outer wall of the detector, and the other end of the second towing rope 671 bypasses the second roller and is freely passed through the second rope-passing hole and then fixed to the second counterweight ball. The second counterweight ball is movably placed in the second limiting cylinder. When the detector reciprocates radially along the rotor, the fixed point of the second towing rope on the detector and the second counterweight ball are always located outside the rotor radial direction of the second partition plate. For the convenience of the second towing rope passing through, a second notch for the second towing rope to pass through is provided on the cylinder wall of the second limiting cylinder. Of course, in another embodiment, the second notch can also be replaced by a second through hole. The inner diameter of the second limiting cylinder is 1 mm larger than the outer diameter of the second counterweight ball.

[0051] When the detector reciprocates radially along the rotor, the fixed point of the second towing rope on the detector and the second counterweight ball are always located outside the rotor radial direction of the second partition plate. The total weight of all the second counterweight balls is equal to the weight of the detector.

[0052] A second cylinder cover 631 is detachably installed at one end outside the rotor radial direction of the second limiting cylinder in a threaded manner, and the second counterweight ball has no contact with the cover plate of the second cylinder cover.

[0053] When the second counterweight ball is located below the second partition plate, there is a distance between the second counterweight ball and the second partition plate, and all the weight of the second counterweight ball is transmitted to the detector through the second towing rope; when the second counterweight ball is located above the second partition plate, the second counterweight ball supports on the second partition plate, and the second towing rope is in a slack state.

[0054] The detection mechanism can rotate synchronously with the rotation of the rotor. When the detection mechanism is located above the central axis of the rotor, the first gravity balancing group balances the weight of the detector; when the detection mechanism is located below the central axis of the rotor, the second gravity balancing group balances the weight of the detector.

[0055] Four first guide rods 45 are arranged inside the outer shell. The four first guide rods 45 are arranged at intervals around the detector. The guide rods extend radially along the rotor. Corresponding to each first guide rod, a guide block 46 is arranged on the outer wall of the detector, and a guide hole is arranged on the guide block. One end of the first guide rod is fixed to the outer shell, and the other end of the first guide rod slidably passes through the guide hole of the corresponding guide block. A retaining nut 47 is screwed on the inner end of the first guide rod in the rotor radial direction, and the retaining nut is used to prevent the detector from falling off the first guide rod.

[0056] The elastic telescopic rod 50 includes a connecting rod 51, a sliding rod 52 and a second spring 54. The connecting rod extends in the radial direction of the mover. An internal threaded tube 311 is welded on the inner wall of the mover. One end of the connecting rod is screwed on the internal threaded tube so that the connecting rod can be detachably connected to the inner wall of the mover. The other end of the connecting rod has a receiving cavity 511. One end of the sliding rod 52 is slidably inserted into the receiving cavity. The connecting rod and the sliding rod are slidably plugged together. The other end of the sliding rod extends out of the receiving cavity to form a connecting end 521. The connecting end has a flange 523. The flange is bolted to the reinforcing plate 43 to fix the sliding rod to the housing of the detection mechanism.

[0057] A first flange 514 is provided on the outer circumference of the connecting rod, a second flange 522 is provided on the outer circumference of the sliding rod, a second spring 54 is sleeved on the connecting rod and located between the first flange and the second flange, and the two ends of the second spring are pressed against the first flange and the second flange respectively. The second guide rod 53 freely passes through the first flange and the second flange and then screws the limit bolt 531 to connect the connecting rod and the sliding rod together; the second external force pushes the sliding rod outward in the radial direction of the mover, which can make the sliding rod move outward in the radial direction of the mover and compress the second spring, and the second external force is canceled, and the second spring can push the sliding rod inward in the radial direction of the mover, so that the sliding rod moves inward in the radial direction of the mover.

[0058] In order to facilitate pushing the sliding rod outward along the radial direction of the mover, the present embodiment also has an adjustment mechanism 550, which includes a fulcrum rod 551 and a tilting rod 56. The fulcrum rod is fixed on the inner wall of the mover, and a fulcrum through hole 552 is provided on the fulcrum rod. One end of the tilting rod is a U-shaped fork 562, and the other end of the tilting rod is a handle 561. The U-shaped fork 562 is clamped on the connecting end 521 of the sliding rod and is located on the side of the second flange 522 away from the first flange. The width of the U-shaped fork is smaller than the outer diameter of the second flange 522; the handle 561 passes freely through the fulcrum through hole.

[0059] Pressing the handle toward the center of the mover can push the sliding rod 52 toward the outside of the mover and compress the second spring. After the pressure on the handle is released, the second spring can push the sliding rod 52 toward the center of the mover.

[0060] By using the elastic telescopic rod, the detector can reciprocate along the radial direction of the mover. When the first spring is in a natural state, the end surface of the detection end of the ultrasonic probe extends out of the outlet end of the shell in the radial direction of the mover.

[0061] The first external force can push the detector radially outward along the mover, causing the detector to retract into the housing and compress the first spring. After the first external force is removed, the first spring can push the detector radially inward along the mover, causing the end face of the detection end of the ultrasonic probe to extend out of the housing.

[0062] The second spring is configured such that when the ultrasonic probe presses against the outer wall of the steel pipe to be measured, the thrust of the second spring is greater than the total restoring force of all the first springs. The elastic telescopic rod can push the outer shell radially inward along the rotor, causing the outer shell to press against the outer wall of the steel pipe to be measured. When the elastic telescopic rod pushes the outer shell radially inward along the rotor and causes the outer shell to press against the outer wall of the steel pipe to be measured, the first spring can push the detection end of the ultrasonic probe to press against the outer wall of the steel pipe to be measured with a set pressure. At this time, the thrust of the elastic telescopic rod is greater than the total restoring force of all the first springs.

[0063] To reduce the friction between the detection mechanism and the steel pipe to be measured during movement, a universal ball 44 is provided at one end on the inner side in the radial direction of the rotor of the outer shell.

[0064] When this embodiment works, first, according to the outer diameter of the steel pipe 100 to be measured, the height of the hollow shaft torque motor is adjusted through the hydraulic piston cylinder serving as the lifting mechanism, so that the central axis of the rotor is collinear with the central axis of the steel pipe to be measured. Then, press the handle 561 of the lever towards the center of the rotor, causing the sliding rod 52 to move radially outward along the rotor, shortening the length of the elastic telescopic rod, and synchronously driving the outer shell 40 and the detector 410 to move radially outward along the rotor to avoid the steel pipe to be measured touching the detector when passing through the inner cavity of the rotor and damaging the detector.

[0065] Then, use a lifting device such as a forklift to support one end of the steel pipe to be measured on the support roller 22 of the first rolling frame 201, and make the steel pipe to be measured clamped in the annular groove 221 to prevent the steel pipe to be measured from rolling. Start the drive motor 23, move the steel pipe to be measured towards the sixth rolling frame 206, and pass through the inner cavity of the rotor until the weld on the steel pipe to be measured is directly opposite the ultrasonic probe, and stop moving the steel pipe to be measured.

[0066] Release the pressing on the handle 561 of the lever. Under the push of the second spring, the outer shell 40 and the detector 410 move radially inward along the rotor towards the center of the rotor, causing the outer shell 40 to press against the outer wall of the steel pipe to be measured. Under the push of the first spring, the ultrasonic probe 411 of the detector presses against the weld of the steel pipe to be measured with a set pressure. Start the hollow shaft torque motor, and make the rotor drive the detector to rotate around the steel pipe to be measured to detect the weld.

[0067] After a period of use, the elasticity of the first spring and the second spring will decrease, affecting the accuracy of detection. In particular, for the first spring, its elasticity needs to be regularly detected to ensure that when the housing presses against the outer wall of the steel pipe to be measured, the ultrasonic probe can press against the weld of the steel pipe to be measured with a set pressure, and this set pressure is the operating pressure of the selected ultrasonic probe. With the support of the housing, the influence of the second spring on the operating pressure of the ultrasonic probe is avoided.

[0068] To reduce the operation intensity, after pressing the handle 561 of the lever, the cushion block 553 can be placed between the mover and the handle, and after the arrangement of the steel pipe to be measured is completed, the cushion block 553 is removed.

Claims

1. A detection device for a welded joint of a metal pipeline, characterized in that, It includes a base, a number of rolling frames installed on the base along the first axis direction, and a hollow shaft torque motor. Each rolling frame has a rotatable support roller that extends along the second axis direction; the central axis of the hollow shaft torque motor extends along the first axis direction. The hollow shaft torque motor includes a stator and a rotor rotatably installed inside the stator, and the stator is installed on the base through a lifting mechanism; both the first axis direction and the second axis direction extend horizontally and are perpendicular to each other; A detection mechanism is installed on the inner wall of the rotor. One end of the detection mechanism extends radially towards the center of the rotor along the radial direction of the rotor and does not exceed the central axis of the rotor; the detection mechanism includes a housing, a detector, and an elastic telescopic rod. The detector has an ultrasonic probe; both ends of the housing in the radial direction of the rotor are respectively formed as a mounting end and an outlet end. The mounting end is installed on the inner wall of the rotor through the elastic telescopic rod. The detector is inserted into the inner cavity of the housing, and the detector is installed on the mounting end through a spring group. The spring group includes at least one first spring; the detection end of the ultrasonic probe extends towards the direction away from the mounting end and can extend out of the outlet end; two gravity balancing groups are installed in the housing. The two gravity balancing groups are respectively a first gravity balancing group and a second gravity balancing group. The first gravity balancing group includes at least one first gravity balancer, and the second gravity balancing group includes at least one second gravity balancer; the detector can reciprocate along the radial direction of the rotor. When the first spring is in the natural state, in the radial direction of the rotor, the end face of the detection end of the ultrasonic probe extends out of the outlet end of the housing; A first external force can push the detector radially outwards along the rotor, causing the detector to retract into the housing and compress the first spring. After the first external force is withdrawn, the first spring can push the detector radially inwards along the rotor and make the end face of the detection end of the ultrasonic probe extend out of the housing; The elastic telescopic rod can push the housing radially inwards along the rotor, causing the housing to press against the outer wall of the steel pipe to be measured. When the elastic telescopic rod pushes the housing radially inwards along the rotor and makes the housing press against the outer wall of the steel pipe to be measured, the first spring can push the detector and make the detection end of the ultrasonic probe press against the outer wall of the steel pipe to be measured with a set pressure. At this time, the thrust of the elastic telescopic rod is greater than the total rebound force of all the first springs; The detection mechanism can rotate synchronously with the rotation of the rotor. When the detection mechanism is above the central axis of the rotor, the first gravity balancing group balances the weight of the detector; when the detection mechanism is below the central axis of the rotor, the second gravity balancing group balances the weight of the detector.

2. The detection device according to claim 1, wherein The first gravity counterweight includes a first partition board and first counterweight balls. The first partition board is fixed on the inner wall of the housing. A first roller is arranged on the outer side of the first partition board in the radial direction of the mover. One end of a first traction rope is fixed on the detector, and the other end of the first traction rope bypasses the first roller and is fixed on the first counterweight ball after freely passing through the first partition board. When the detector reciprocates in the radial direction of the mover, the fixed point of the first traction rope on the detector and the first counterweight ball are always located on the inner side of the first partition board in the radial direction of the mover. The total weight of all the first counterweight balls is equal to the weight of the detector. When the first counterweight ball is located below the first partition board, there is a distance between the first counterweight ball and the first partition board, and all the weight of the first counterweight ball is transmitted to the detector through the first traction rope. When the first counterweight ball is located above the first partition board, the first counterweight ball supports on the first partition board, and the first traction rope is in a slack state. The second gravity counterweight includes a second partition board and second counterweight balls. The second partition board is fixed on the inner wall of the housing. A second roller is arranged on the inner side of the second partition board in the radial direction of the mover. One end of a second traction rope is fixed on the detector, and the other end of the second traction rope bypasses the second roller and is fixed on the second counterweight ball after freely passing through the second partition board. When the detector reciprocates in the radial direction of the mover, the fixed point of the second traction rope on the detector and the second counterweight ball are always located on the outer side of the second partition board in the radial direction of the mover. The total weight of all the second counterweight balls is equal to the weight of the detector. When the second counterweight ball is located below the second partition board, there is a distance between the second counterweight ball and the second partition board, and all the weight of the second counterweight ball is transmitted to the detector through the second traction rope. When the second counterweight ball is located above the second partition board, the second counterweight ball supports on the second partition board, and the second traction rope is in a slack state.

3. The detection device according to claim 2, characterized in that, The first gravity counterweight further includes a first bearing plate, which is fixed on the inner wall of the housing. A first limiting cylinder is arranged on the inner side of the first bearing plate in the radial direction of the mover. The first partition board is fixed in the first limiting cylinder, and the first counterweight ball is movably placed in the first limiting cylinder. The second gravity counterweight further includes a second bearing plate, which is fixed on the inner wall of the housing. A second limiting cylinder is arranged on the outer side of the second bearing plate in the radial direction of the mover. The second partition board is fixed in the first limiting cylinder, and the second counterweight ball is movably placed in the second limiting cylinder.

4. The detection device according to claim 3, characterized in that, A first cylinder cover is detachably installed at one end of the first limiting cylinder on the inner side in the radial direction of the mover, and the first counterweight ball has no contact with the cover plate of the first cylinder cover. A second cylinder cover is detachably installed at one end of the second limiting cylinder on the outer side in the radial direction of the mover, and the second counterweight ball has no contact with the cover plate of the second cylinder cover.

5. The detection device according to claim 1, characterized in that, A universal ball is arranged at one end of the housing on the inner side in the radial direction of the mover.

6. The detection device according to claim 1, wherein, A number of first guide rods are arranged inside the housing. The number of these first guide rods is arranged at intervals around the detector. The guide rods extend along the radial direction of the mover. Corresponding to each first guide rod, a guide block is arranged on the outer wall of the detector, and a guide hole is arranged on the guide block. One end of the first guide rod is fixed on the housing, and the other end of the first guide rod slidably passes through the guide hole of the corresponding guide block.

7. The detection device according to claim 6, wherein An anti-dropping nut is screwed on the inner end of the first guide rod in the radial direction of the mover.

8. The detection device according to claim 1, wherein The elastic telescopic rod comprises a connecting rod, a sliding rod and a second spring. The connecting rod extends in the radial direction of the mover. One end of the connecting rod is detachably connected to the inner wall of the mover. The other end of the connecting rod is slidably plugged with the sliding rod. The end of the connecting rod facing away from the sliding rod is fixed to the housing of the detection mechanism. A first flange is provided on the outer circumferential surface of the connecting rod, and a second flange is provided on the outer circumferential surface of the sliding rod. The second spring is sleeved on the connecting rod and is located between the first flange and the second flange, and the two ends of the second spring are respectively pressed against the first flange and the second flange; the second guide rod freely passes through the first flange and the second flange and then the limiting bolt is screwed to connect the connecting rod and the sliding rod together; the second external force pushes the sliding rod outward in the radial direction of the mover, so that the sliding rod can move toward the outer side in the radial direction of the mover and compress the second spring, and the second external force is canceled, and the second spring can push the sliding rod inward in the radial direction of the mover, so that the sliding rod moves inward in the radial direction of the mover; The second spring is configured such that when the ultrasonic probe is pressed against the outer wall of the steel pipe to be tested, the thrust of the second spring is greater than the total rebound force of all the first springs.

9. The detection device according to claim 8, wherein, It also has an adjustment mechanism, which includes a fulcrum rod and a tilting rod. The fulcrum rod is fixed on the inner wall of the mover, a fulcrum through hole is provided on the fulcrum rod, one end of the tilting rod is connected to the sliding rod, and the other end of the tilting rod freely passes through the fulcrum through hole to form a handle.

10. The detection device according to claim 1, characterized in that, A V-shaped annular groove is provided on the support roller, and the annular groove is used to place the steel pipe to be tested. When the steel pipe to be tested is placed in the annular groove, the central axis of the steel pipe to be tested and the central axis of the mover are located in the same vertical plane.

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