A multi-angle welding joint airtightness detection device for ships

Abstract

The present invention discloses a multi-angle welding joint airtightness detection device for ships, which relates to the technical field of airtightness detection. The detection device includes an installation box, a limiting device, a driving device, a weld detection device, a leakage detection device, and a high-pressure air pump. The installation box is fixedly connected to the limiting device, and the installation box is fixedly connected to the driving device. There are two driving devices, and the two driving devices are respectively fixedly connected to the weld detection device and the leakage detection device. The high-pressure air pump is fixedly connected to the installation box. The steel pipe is fixed by the limiting device, and the driving device drives the weld detection device to move up and down and move along the radial direction of the steel pipe to detect the position of the weld on the steel pipe. According to the position of the weld detected by the weld detection device, the driving device drives the leakage detection device to move to the weld position. At the same time, the high-pressure air pump conveys high-pressure gas into the steel pipe. When there is a leakage point on the weld, the gas quickly sprays out from the leakage point, and then the leakage detection device detects the leakage position.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, in particular to a multi-angle welding seam air tightness detection device for ships. Background Art

[0002] In shipbuilding, the airtightness of the welded seams of many steel pipes on ships is directly related to the safety and service life of the hull structure. Traditional steel pipe inspection methods mostly rely on manual visual inspection or local scanning with a single sensor, which has problems such as low efficiency and high missed detection rate.

[0003] Especially for welds on steel pipes, at present, soapy water is often applied manually to observe the bubble position, but the bubble formation range is large, and the detection accuracy of the leakage position is difficult to control. At the same time, existing equipment cannot realize multi-angle adaptive detection of weld leakage position. In addition, contact flaw detection is easy to cause wear to the weld surface, and the precise positioning of the airflow leakage point lacks a dynamic feedback mechanism, resulting in limited detection accuracy. With the large-scale ships and the complexity of welding processes, an integrated, automated and efficient equipment that can adapt to multi-angle detection is now needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-angle welding seam air tightness detection device for ships to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-angle welding seam air tightness detection device for ships, the detection device includes an installation box, a limit device, a drive device, a weld detection device, a leakage detection device and a high-pressure air pump. The installation box and the limit device are tightly connected, and the installation box and the drive device are tightly connected. There are two drive devices, and the two drive devices are tightly connected to the weld detection device and the leakage detection device respectively. The high-pressure air pump is tightly connected to the installation box.

[0007] The installation box serves as the main installation base for the installation and positioning of other devices. The steel pipe is fixed by a limit device, and the weld detection device is driven to move up and down and radially along the steel pipe by a driving device to detect the position of the weld on the steel pipe. According to the position of the weld detected by the weld detection device, the driving device drives the leakage device to move to the weld position. At the same time, the high-pressure air pump delivers high-pressure gas to the inside of the steel pipe. When there is a leakage point on the weld, the gas is quickly ejected from the leakage point, and then the leakage detection device detects the leakage position.

[0008] Further, the installation box is provided with a first installation cavity, a second installation cavity and a connection hole. The limiting device is placed in the first installation cavity, the driving device is placed in the first installation cavity, the weld detection device is placed in the first installation cavity, the air leakage detection device is placed in the first installation cavity. The limiting device is fixedly connected to the first installation cavity, the driving device is fixedly connected to the first installation cavity, the high-pressure air pump is placed in the second installation cavity, the high-pressure air pump is fixedly connected to the second installation cavity, the first installation cavity and the second installation cavity are communicated through the connection hole, and the output end of the high-pressure air pump is fixedly connected to the connection hole.

[0009] The first installation cavity serves as the main installation foundation to provide installation positions for the limiting device, the driving device, the weld detection device and the air leakage detection device. The second installation cavity provides an installation position for the high-pressure air pump. Through the connection hole, the high-pressure air pump can convey high-pressure gas to the article to be detected on the limiting device in the first installation cavity, so that the subsequent air leakage detection device can detect the air leakage position on the weld.

[0010] Further, the limiting device includes a first limiting base, a first limiting frustum, a second limiting base, a second limiting frustum and a limiting cylinder. The first limiting base is fixedly connected to the first installation cavity. The first limiting base is provided with a ventilation hole. The first limiting frustum is provided with an air inlet hole. The connection hole, the ventilation hole and the air inlet hole are communicated in sequence. The first limiting base is fixedly connected to the first limiting frustum. The limiting cylinder is fixedly connected to the first installation cavity. The output end of the limiting cylinder is fixedly connected to the second limiting base. The second limiting frustum is placed in the second limiting base. The second limiting base is fixedly connected to the second limiting frustum.

[0011] The first limiting base serves as an installation foundation to provide an installation position for the first limiting frustum. The second limiting base serves as an installation foundation to provide an installation position for the second limiting frustum. Before detection, the steel pipe is placed on the first limiting frustum. Through the conical surface of the first limiting frustum, steel pipes with different apertures can be connected to the first limiting frustum. Then the output of the limiting cylinder drives the second limiting base to move. The movement of the second limiting base drives the second limiting frustum to move. Finally, the second limiting frustum is connected to one end of the steel pipe far from the first limiting frustum. The steel pipe is fixed between the first limiting frustum and the second limiting frustum by the limiting cylinder. When starting to detect the weld position, an alternating magnetic field is generated by the weld detection device, which causes eddy currents in the steel pipe. Since the material structure of the steel pipe itself is the same, the eddy currents generated by the steel pipe are relatively uniform and stable. However, the magnetic field generated by the weld is different from the eddy currents generated by the steel pipe due to the uneven material. The weld position is accurately positioned by detecting the change position of the eddy currents through the weld detection device.

[0012] Further, the driving device includes a fixed track, a fixed motor, a screw rod, and a connecting block. The fixed track is fixedly connected to the first installation cavity, the fixed motor is fixedly connected to the first installation cavity, the screw rod is placed inside the fixed track, the output end of the fixed motor is fixedly connected to the screw rod, the screw rod is threadedly connected to the connecting block, the connecting block connected to the weld detection device is fixedly connected to the weld detection device, and the connecting block adjacent to the air leakage detection device is fixedly connected to the air leakage detection device.

[0013] The fixed track serves as an installation base for the installation and positioning of other components. When it is necessary to drive the weld detection device and the air leakage detection device to move up and down along the steel pipe, the fixed motor outputs a rotational torque to drive the screw rod to rotate. The rotation of the screw rod drives the connecting block to move up and down, and the movement of the connecting block drives the connected weld detection device and air leakage detection device to move up and down respectively, so that the weld detection device and the air leakage detection device can comprehensively detect the steel pipe.

[0014] Further, the driving device further includes a fixed ring, a driving motor, a fixed gear, and a gear ring. The fixed ring is fixedly connected to the connecting block, a first installation groove is provided on the fixed ring, the gear ring is placed inside the first installation groove, the driving motor is slidably connected to the fixed ring, the output end of the driving motor is fixedly connected to the fixed gear, the fixed gear meshes with the gear ring, the driving motor connected to the weld detection device is fixedly connected to the weld detection device, and the driving motor connected to the air leakage detection device is fixedly connected to the air leakage detection device.

[0015] The fixed ring serves as an installation base for the installation of other components. When the weld detection device and the air leakage detection device need to perform radial detection on the steel pipe, the driving motor outputs a rotational torque to drive the fixed gear to rotate. The rotation of the fixed gear interacts with the gear ring, so that the gear ring has a reaction force on the fixed gear, thereby driving the fixed gear to move along the direction of the gear ring. The movement of the fixed gear drives the device connected to the driving motor to move. The driving motor moves respectively to drive the weld detection device and the air leakage detection device connected to the driving motor to move radially along the steel pipe, realizing the radial detection of the steel pipe.

[0016] Further, the weld detection device includes a fixed cylinder and a detection housing. The fixed cylinder is fixedly connected to the adjacent driving motor, the detection housing is fixedly connected to the output end of the fixed cylinder, and an electromagnetic coil, a capacitor, a power supply, and an ammeter are provided inside the detection housing. The electromagnetic coil is electrically connected to the power supply, the capacitor is connected in parallel with the electromagnetic coil by wires, and the electromagnetic coil is electrically connected to the ammeter by wires.

[0017] When it is necessary to detect the position of the weld seam, the output of the fixed cylinder drives the detection housing to move near the surface of the steel pipe. At the same time, the power supply is turned on to output current, and the current passes through the electromagnetic coil and the capacitor to generate an alternating magnetic field. The alternating magnetic field will penetrate the surface of the steel pipe and generate eddy currents inside the steel pipe. The secondary magnetic field generated by the eddy currents will act on the electromagnetic coil in reverse, thereby changing the impedance of the electromagnetic coil and causing the current on the electromagnetic coil to change. When the weld seam is detected, due to the different eddy currents generated by the weld seam and the steel pipe, the impedance of the electromagnetic coil is different. The current value is detected by the ammeter. When it is detected that the value of the ammeter has changed, this position is the weld seam position. The weld seam position can be judged by observing the signal fluctuation, without post-processing, which is convenient, simple and fast. At the same time, the non-contact detection avoids the wear of the steel pipe.

[0018] Further, the air leakage detection device includes a manipulator and a detection element. The manipulator is fixedly connected to the adjacent drive motor, and the manipulator is fixedly connected to the detection element.

[0019] When it is necessary to detect the air leakage point on the weld seam, the detection angle of the detection element can be adjusted through the manipulator, so as to realize multi-angle detection, and the position of the air leakage point is detected through the detection element.

[0020] Further, the detection element includes a detection housing, a detection spring, a detection coil, a detection magnet, a detection plate and a limit block. The detection housing is fixedly connected to the manipulator, the detection housing is fixedly connected to the limit block, the detection spring is placed inside the limit block, and the detection spring is fixedly connected to the detection housing. One end of the detection spring away from the detection housing is fixedly connected to the detection magnet. The detection coil is placed outside the limit block. One end of the detection magnet away from the detection spring is hinged to the detection plate, and the detection magnet is slidably connected to the limit block.

[0021] The position of the air leakage point is detected by moving the detection element at the weld seam. The detection housing is used for installing and supporting other components. When there is an air leakage position, due to the high-pressure gas in the steel pipe, the gas ejected from the air leakage position has a relatively high speed. When the gas acts on the detection plate, the detection plate is driven to move by the force of the gas on the detection plate. The movement of the detection plate drives the detection magnet to move. The movement of the detection magnet drives the detection spring to compress. At the same time, the movement of the detection magnet causes the magnetic flux in the detection coil to change, thereby generating an induced current. The force generated by the gas acts on the detection plate, and finally an induced current is generated. Whether there is an air leakage point at this position is judged according to the presence or absence of the induced current.

[0022] Furthermore, the detection plate is provided with several second mounting grooves, the second mounting groove is provided with a first reset spring, a first movable plate and a support plate, the first reset spring is fastened to the second mounting groove, the first reset spring is fastened to the first movable plate at one end away from the second mounting groove, the first movable plate and the support plate are rotatably connected, the limit block is provided with several third mounting grooves, the third mounting groove is provided with a second reset spring, a movable magnet and an induction coil, the second reset spring is fastened to the third mounting groove, the second reset spring is fastened to the movable magnet at one end away from the third mounting groove, and an induction coil is provided outside the movable magnet.

[0023] When the position of the force of the gas at the leakage position is not in the central area of the detection plate, the detection plate is likely to mark the leakage position incorrectly. When the gas acts on the edge of the detection plate, the detection plate tilts. After the detection plate tilts, the support plate in the second mounting groove near the tilted position is pressed down, and the downward pressure of the support plate drives the first movable plate, and the movement of the second movable plate drives the first return spring to be compressed. At the same time, the downward pressure of the support plate drives the movable magnet on the third mounting groove to move, and the movement of the movable magnet drives the second return spring to be compressed. At the same time, the movement of the movable magnet causes the magnetic flux in the induction coil to change, thereby generating an induced current. According to the position where the induced current is generated, the manipulator moves the detection element so that the position where the gas acts on the detection plate belongs to the central area of the detection plate, thereby ensuring the accurate positioning of the leakage position.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Through the coordinated control of two driving devices, the weld detection device and the gas leakage detection device can realize the compound motion of axial lifting and radial rotation. Combined with the multi-degree-of-freedom adjustment of the manipulator, it is suitable for the detection of steel pipes.

[0026] 2. Using electromagnetic eddy current detection technology, an alternating magnetic field is generated by electromagnetic coils and capacitors to monitor the impedance changes caused by eddy currents in steel pipes in real time, quickly identify the weld position in a non-contact state, and avoid probe wear.

[0027] 3. The leakage point is detected by detecting the airflow induction of the detection element and the change of the magnetic flux of the coil. When the leakage airflow hits the detection plate, the magnetic flux of the detection coil is changed by detecting the displacement of the magnet, and the micro airflow signal is converted into an electrical signal, thereby identifying the leakage point.

[0028] 4. Multiple sets of reset springs and induction coils are set on the edge of the detection plate. When the airflow deviates from the central area, the support plate is pressed down to trigger the displacement of the moving magnet. The deviation direction is located by the induced current, and the robot is driven to automatically adjust the detection angle, thereby achieving accurate positioning of the leakage point. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1Schematic diagram of the installation box structure of the present invention;

[0030] Figure 2 Schematic diagram of the internal structure of the installation box of the present invention;

[0031] Figure 3 Schematic diagram of the structure of the limiting device of the present invention;

[0032] Figure 4 Schematic diagram of the structure of the driving device of the present invention;

[0033] Figure 5 Schematic diagram of the structure of the detection housing of the present invention;

[0034] Figure 6 Schematic diagram of the structure of the air leakage detection device of the present invention;

[0035] Figure 7 Schematic diagram of the structure of the detection element of the present invention;

[0036] Figure 8 is Figure 7 Local enlarged view of A;

[0037] Figure 9 is Figure 7 Local enlarged view of B.

[0038] In the figure: 1. Installation box; 11. First installation cavity; 12. Second installation cavity; 13. Connection hole; 2. Limiting device; 21. First limiting base; 211. Ventilation hole; 22. First limiting frustum; 221. Air inlet hole; 23. Second limiting base; 24. Second limiting frustum; 25. Limiting cylinder; 3. Driving device; 31. Fixed track; 32. Fixed motor; 33. Screw; 34. Connection block; 35. Fixed ring; 351. First installation groove; 36. Driving motor; 37. Fixed gear; 38. Tooth ring; 4. Weld seam detection device; 41. Fixed cylinder; 42. Detection housing; 43. Electromagnetic coil; 44. Capacitor; 45. Power supply; 46. Ammeter; 5. Air leakage detection device; 51. Manipulator; 52. Detection element; 521. Detection housing; 522. Detection spring; 523. Detection coil; 524. Detection magnet; 525. Detection plate; 5251. Second installation groove; 5252. First return spring; 5253. First moving plate; 5254. Support plate; 526. Limiting block; 5261. Third installation groove; 5262. Second return spring; 5263. Moving magnet; 6. High-pressure air pump. Detailed implementation manners

[0039] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment: As Figures 1-9 shown, the present invention provides a technical solution for an airtightness detection device for multi-angle welding seams of a ship. The detection device includes an installation box 1, a limiting device 2, a driving device 3, a weld detection device 4, a leakage detection device 5, and a high-pressure air pump 6. The installation box 1 and the limiting device 2 are fixedly connected, the installation box 1 and the driving device 3 are fixedly connected. There are two driving devices 3, and the two driving devices 3 are respectively fixedly connected to the weld detection device 4 and the leakage detection device 5. The high-pressure air pump 6 and the installation box 1 are fixedly connected.

[0041] The installation box 1 serves as the main installation foundation for the installation and positioning of other devices. The steel pipe is fixed by the limiting device 2. The driving device 3 drives the weld detection device 4 to move up and down and along the radial direction of the steel pipe to detect the position of the weld on the steel pipe. According to the position of the weld detected by the weld detection device 4, the driving device 3 drives the leakage detection device 5 to move to the weld position. At the same time, the high-pressure air pump 6 conveys high-pressure gas into the steel pipe. When there is a leakage point on the weld, the gas quickly sprays out from the leakage point, and then the leakage detection device 5 detects the leakage position.

[0042] As Figures 1-3 shown, the installation box 1 is provided with a first installation cavity 11, a second installation cavity 12, and a connection hole 13. The limiting device 2 is placed in the first installation cavity 11, the driving device 3 is placed in the first installation cavity 11, the weld detection device 4 is placed in the first installation cavity 11, the leakage detection device 5 is placed in the first installation cavity 11. The limiting device 2 and the first installation cavity 11 are fixedly connected, the driving device 3 and the first installation cavity 11 are fixedly connected. The high-pressure air pump 6 is placed in the second installation cavity 12, the high-pressure air pump 6 and the second installation cavity 12 are fixedly connected. The first installation cavity 11 and the second installation cavity 12 are communicated through the connection hole 13, and the output end of the high-pressure air pump 6 and the connection hole 13 are fixedly connected.

[0043] The first installation cavity 11 serves as the main installation foundation to provide installation positions for the limiting device 2, the driving device 3, the weld detection device 4, and the leakage detection device 5. The second installation cavity 12 provides an installation position for the high-pressure air pump 6. Through the connection hole 13, the high-pressure air pump 6 can convey high-pressure gas to the item to be detected on the limiting device 2 in the first installation cavity 11, so that the subsequent leakage detection device 5 can detect the leakage position on the weld.

[0044] As Figures 2-3As shown in the figure, the limiting device 2 includes a first limiting base 21, a first limiting frustum 22, a second limiting base 23, a second limiting frustum 24 and a limiting cylinder 25. The first limiting base 21 is fixedly connected to the first installation cavity 11. An air vent 211 is provided on the first limiting base 21, and an air inlet hole 221 is provided on the first limiting frustum 22. The connection hole 13, the air vent 211 and the air inlet hole 221 are communicated in sequence. The first limiting base 21 is fixedly connected to the first limiting frustum 22. The limiting cylinder 25 is fixedly connected to the first installation cavity 11. The output end of the limiting cylinder 25 is fixedly connected to the second limiting base 23. The second limiting frustum 24 is placed inside the second limiting base 23, and the second limiting base 23 is fixedly connected to the second limiting frustum 24.

[0045] The first limiting base 21 serves as an installation base to provide an installation position for the first limiting frustum 22, and the second limiting base 23 serves as an installation base to provide an installation position for the second limiting frustum 24. Before detection, the steel pipe is placed on the first limiting frustum 22. Through the conical surface of the first limiting frustum 22, steel pipes with different apertures can be connected to the first limiting frustum 22. Then, the output of the limiting cylinder 25 drives the second limiting base 23 to move. The movement of the second limiting base 23 drives the second limiting frustum 24 to move, and finally the second limiting frustum 24 is connected to the end of the steel pipe far from the first limiting frustum 22. The steel pipe is fixed between the first limiting frustum 22 and the second limiting frustum 24 by the limiting cylinder 25. When starting to detect the weld position, an alternating magnetic field is generated by the weld detection device 4, which causes eddy currents to be generated in the steel pipe. Since the material structure of the steel pipe itself is the same, the eddy currents generated by the steel pipe are relatively uniform and stable. However, the magnetic field generated by the weld is different from the eddy currents generated by the steel pipe due to the non-uniform material. The weld position is accurately positioned by detecting the change position of the eddy currents through the weld detection device 4.

[0046] As Figures 2-4 As shown in the figure, the driving device 3 includes a fixed track 31, a fixed motor 32, a screw 33 and a connecting block 34. The fixed track 31 is fixedly connected to the first installation cavity 11. The fixed motor 32 is fixedly connected to the first installation cavity 11. The screw 33 is placed inside the fixed track 31. The output end of the fixed motor 32 is fixedly connected to the screw 33. The screw 33 is threadedly connected to the connecting block 34. The connecting block 34 connected to the weld detection device 4 is fixedly connected to the weld detection device 4, and the connecting block 34 adjacent to the air leakage detection device 5 is fixedly connected to the air leakage detection device 5.

[0047] The fixed track 31 serves as an installation base for the installation and positioning of other components. When it is necessary to drive the weld detection device 4 and the air leakage detection device 5 to move up and down along the steel pipe, the fixed motor 32 outputs a rotational torque to drive the screw 33 to rotate. The rotation of the screw 33 drives the connecting block 34 to move up and down. The movement of the connecting block 34 drives the connected weld detection device 4 and air leakage detection device 5 to move up and down respectively, so that the weld detection device 4 and the air leakage detection device 5 can comprehensively detect the steel pipe.

[0048] As Figures 2-4 and Figure 6 shown, the driving device 3 further includes a fixed ring 35, a driving motor 36, a fixed gear 37 and a gear ring 38. The fixed ring 35 is fixedly connected to the connecting block 34. A first installation groove 351 is provided on the fixed ring 35. The gear ring 38 is placed in the first installation groove 351. The driving motor 36 is slidably connected to the fixed ring 35. The output end of the driving motor 36 is fixedly connected to the fixed gear 37. The fixed gear 37 meshes with the gear ring 38. The driving motor 36 connected to the weld detection device 4 is fixedly connected to the weld detection device 4. The driving motor 36 connected to the air leakage detection device 5 is fixedly connected to the air leakage detection device 5.

[0049] The fixed ring 35 serves as an installation base for the installation of other components. When the weld detection device 4 and the air leakage detection device 5 need to perform radial detection on the steel pipe, the driving motor 36 outputs a rotational torque to drive the fixed gear 37 to rotate. The rotation of the fixed gear 37 interacts with the gear ring 38, so that the gear ring 38 has a reaction force on the fixed gear 47, thereby driving the fixed gear 37 to move along the direction of the gear ring 38. The movement of the fixed gear 37 drives the device connected to the driving motor 36 to move. By moving the driving motor 36, the connected weld detection device 4 and air leakage detection device 5 connected to the driving motor 36 are driven to move radially along the steel pipe, realizing the radial detection of the steel pipe.

[0050] As Figure 4 and Figure 5 shown, the weld detection device 4 includes a fixed cylinder 41 and a detection housing 42. The fixed cylinder 41 is fixedly connected to the adjacent driving motor 36. The detection housing 42 is fixedly connected to the output end of the fixed cylinder 41. An electromagnetic coil 43, a capacitor 44, a power supply 45 and an ammeter 46 are provided in the detection housing 42. The electromagnetic coil 43 is connected to the power supply 45 by a wire. The capacitor 44 is connected in parallel with the electromagnetic coil 43 by a wire. The electromagnetic coil 43 is connected to the ammeter 46 by a wire.

[0051] When it is necessary to detect the weld position, the fixed cylinder 41 outputs to drive the detection housing 42 to move near the surface of the steel pipe. At the same time, the power supply 45 is turned on to output current. The current passes through the electromagnetic coil 43 and the capacitor 44 to generate an alternating magnetic field. The alternating magnetic field will penetrate the surface of the steel pipe and generate eddy currents inside the steel pipe. The secondary magnetic field generated by the eddy currents will act on the electromagnetic coil 43 in reverse, thereby changing the impedance of the electromagnetic coil 43, causing the current on the electromagnetic coil 43 to change. When the weld is detected, due to the different eddy currents generated by the weld and the steel pipe, the impedance of the electromagnetic coil 43 is different. The current value is detected by the ammeter 46. When it is detected that the value of the ammeter 46 changes, this position is the weld position. By observing the signal fluctuation, the weld position can be judged without post-processing, which is convenient, simple and fast. At the same time, non-contact detection avoids abrasion of the steel pipe.

[0052] As Figure 3 and Figure 6 shown, the air leakage detection device 5 includes a manipulator 51 and a detection element 52. The manipulator 51 is fixedly connected to the adjacent drive motor 36, and the manipulator 51 is fixedly connected to the detection element 52.

[0053] When it is necessary to detect the air leakage point on the weld, the detection angle of the detection element 52 can be adjusted through the manipulator 51, so as to realize multi-angle detection, and the position of the air leakage point is detected through the detection element 52.

[0054] As Figure 7 shown, the detection element 52 includes a detection housing 521, a detection spring 522, a detection coil 523, a detection magnet 524, a detection plate 525 and a limit block 526. The detection housing 521 is fixedly connected to the manipulator 51, the detection housing 521 is fixedly connected to the limit block 526, the detection spring 522 is placed inside the limit block 526, the detection spring 522 is fixedly connected to the detection housing 521, one end of the detection spring 522 away from the detection housing 521 is fixedly connected to the detection magnet 524, the detection coil 523 is placed outside the limit block 526, one end of the detection magnet 524 away from the detection spring 522 is hinged to the detection plate 525, and the detection magnet 524 is slidably connected to the limit block 526.

[0055] The position detection of the air leakage point is achieved by moving the detection element 52 at the weld. The detection housing 521 is used for the installation and support of other components. When there is an air leakage position, due to the high-pressure gas in the steel pipe, the gas ejected from the air leakage position has a relatively high speed. When the gas acts on the detection plate 525, the detection plate 525 is driven to move by the force of the gas on the detection plate 525. The movement of the detection plate 525 drives the movement of the detection magnet 524. The movement of the detection magnet 524 drives the compression of the detection spring 522. At the same time, the movement of the detection magnet 524 causes a change in the magnetic flux in the detection coil 523, thereby generating an induced current. An induced current is finally generated by the force of the gas acting on the detection plate 525. Whether there is an air leakage point at this position is judged according to the presence or absence of the induced current.

[0056] As Figures 7-9 shown, a plurality of second mounting grooves 5251 are provided on the detection plate 525. A first return spring 5252, a first moving plate 5253 and a support plate 5254 are provided on the second mounting groove 5251. The first return spring 5252 is fixedly connected to the second mounting groove 5251. One end of the first return spring 5252 away from the second mounting groove 5251 is fixedly connected to the first moving plate 5253. The first moving plate 5253 is rotatably connected to the support plate 5254. A plurality of third mounting grooves 5261 are provided on the limit block 526. A second return spring 5262, a moving magnet 5263 and an induction coil are provided on the third mounting groove 5261. The second return spring 5262 is fixedly connected to the third mounting groove 5261. One end of the second return spring 5262 away from the third mounting groove 5261 is fixedly connected to the moving magnet 5263. An induction coil is provided outside the moving magnet 5263.

[0057] When the position of the force of the gas at the air leakage position is not in the central area of the detection plate 525, the detection plate 525 is prone to mislabel the air leakage position. When the gas acts on the edge of the detection plate 525, the detection plate 525 tilts. After the detection plate 525 tilts, the support plate 5254 in the second mounting groove 5251 near the tilted position is pressed down. The pressing down of the support plate 5254 drives the first moving plate 5253. The movement of the second moving plate 5253 drives the compression of the first return spring 5252. At the same time, the pressing down of the support plate 5254 drives the movement of the moving magnet 5263 on the third mounting groove 5261. The movement of the moving magnet 5263 drives the compression of the second return spring 5262. At the same time, the movement of the moving magnet 5263 causes a change in the magnetic flux in the induction coil, thereby generating an induced current. According to the position where the induced current is generated, the manipulator 51 moves the position of the detection element 52 so that the position where the gas acts on the detection plate 525 belongs to the central area of the detection plate 525, thereby ensuring the accurate positioning of the air leakage position.

[0058] Working principle of the present invention: The limiting device 2 fixes the steel pipe. The welding seam detection device 4 is driven by the driving device 3 to move up and down and move along the radial direction of the steel pipe to detect the position of the welding seam on the steel pipe. When detecting the welding seam position, the fixing cylinder 41 outputs to drive the detection housing 42 to move near the surface of the steel pipe. At the same time, the power supply 45 is turned on to output current. The current passes through the electromagnetic coil 43 and the capacitor 44 to generate an alternating magnetic field. The alternating magnetic field penetrates the surface of the steel pipe and generates eddy currents inside the steel pipe. The secondary magnetic field generated by the eddy currents will act on the electromagnetic coil 43 in reverse, thereby changing the impedance of the electromagnetic coil 43 and causing the current on the electromagnetic coil 43 to change. When a welding seam is detected, due to the different eddy currents generated by the welding seam and the steel pipe, the impedance of the electromagnetic coil 43 is different. The current value is detected by the ammeter 46. When it is detected that the value of the ammeter 46 changes, this position is the welding seam position. According to the position of the welding seam detected by the welding seam detection device 4, the driving device 3 drives the air leakage device 5 to move to the welding seam position. At the same time, the high-pressure air pump 6 conveys high-pressure gas into the steel pipe. When there is an air leakage point on the welding seam, due to the high-pressure gas existing in the steel pipe, the speed of the gas ejected from the air leakage position is relatively fast. When the gas acts on the detection plate 525, the detection plate 525 is driven to move by the acting force of the gas on the detection plate 525. The movement of the detection plate 525 drives the detection magnet 524 to move. The movement of the detection magnet 524 drives the detection spring 522 to compress. At the same time, the movement of the detection magnet 524 causes the magnetic flux in the detection coil 523 to change, thereby generating an induced current. The acting force generated by the gas acts on the detection plate 525, and finally an induced current is generated. Whether there is an air leakage point at this position is judged according to the presence or absence of the induced current.

[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An airtightness detection device for multi-angle welding seams of ships, characterized in that: The detection device includes an installation box (1), a limiting device (2), a driving device (3), a weld detection device (4), a leak detection device (5), and a high-pressure air pump (6). The installation box (1) is fixedly connected to the limiting device (2), the installation box (1) is fixedly connected to the driving device (3). There are two driving devices (3), and the two driving devices (3) are respectively fixedly connected to the weld detection device (4) and the leak detection device (5). The high-pressure air pump (6) is fixedly connected to the installation box (1); The limiting device (2) includes a first limiting base (21), a first limiting frustum (22), a second limiting base (23), a second limiting frustum (24), and a limiting cylinder (25). The first limiting base (21) is fixedly connected to the first limiting frustum (22). The output end of the limiting cylinder (25) is fixedly connected to the second limiting base (23). The second limiting frustum (24) is placed inside the second limiting base (23), and the second limiting base (23) is fixedly connected to the second limiting frustum (24); The weld detection device (4) includes a fixed cylinder (41) and a detection housing (42), and the detection housing (42) is fixedly connected to the output end of the fixed cylinder (41); The leak detection device (5) includes a manipulator (51) and a detection element (52). The manipulator (51) is fixedly connected to the adjacent driving motor (36), and the manipulator (51) is fixedly connected to the detection element (52); The detection element (52) includes a detection housing (521), a detection spring (522), a detection coil (523), a detection magnet (524), a detection plate (525), and a limiting block (526). The detection housing (521) is fixedly connected to the limiting block (526). The detection spring (522) is placed inside the limiting block (526), and the detection spring (522) is fixedly connected to the detection housing (521). One end of the detection spring (522) away from the detection housing (521) is fixedly connected to the detection magnet (524). The detection coil (523) is placed outside the limiting block (526). One end of the detection magnet (524) away from the detection spring (522) is hinged to the detection plate (525). The detection magnet (524) is slidably connected to the limiting block (526). The detection housing (521) is fixedly connected to the manipulator (51).

2. The airtightness detection device for multi-angle welding seams of a ship according to claim 1, characterized in that: The installation box (1) is provided with a first installation cavity (11), a second installation cavity (12) and a connection hole (13). The limiting device (2) is placed in the first installation cavity (11), the driving device (3) is placed in the first installation cavity (11), the weld detection device (4) is placed in the first installation cavity (11), the air leakage detection device (5) is placed in the first installation cavity (11). The limiting device (2) is fixedly connected to the first installation cavity (11), the driving device (3) is fixedly connected to the first installation cavity (11), the high-pressure air pump (6) is placed in the second installation cavity (12), and the high-pressure air pump (6) is fixedly connected to the second installation cavity (12). The first installation cavity (11) and the second installation cavity (12) are communicated through the connection hole (13), and the output end of the high-pressure air pump (6) is fixedly connected to the connection hole (13).

3. The airtightness detection device for multi-angle welding seams of a ship according to claim 2, characterized in that: The first limiting base (21) is fixedly connected to the first installation cavity (11). The first limiting base (21) is provided with a ventilation hole (211). The first limiting frustum (22) is provided with an air inlet hole (221). The connection hole (13), the ventilation hole (211) and the air inlet hole (221) are communicated in sequence. The limiting cylinder (25) is fixedly connected to the first installation cavity (11).

4. A multi-angle welding joint airtightness detection device for ships according to claim 2, characterized in that: The driving device (3) includes a fixed track (31), a fixed motor (32), a screw (33) and a connection block (34). The fixed track (31) is fixedly connected to the first installation cavity (11), the fixed motor (32) is fixedly connected to the first installation cavity (11), the screw (33) is placed in the fixed track (31), the output end of the fixed motor (32) is fixedly connected to the screw (3), the screw (33) is threadedly connected to the connection block (34), the connection block (34) adjacent to the weld detection device (4) is fixedly connected to the weld detection device (4), and the connection block (34) adjacent to the air leakage detection device (5) is fixedly connected to the air leakage detection device (5).

5. A multi-angle welding joint airtightness detection device for ships according to claim 4, characterized in that: The driving device (3) further includes a fixed ring (35), a driving motor (36), a fixed gear (37) and a gear ring (38). The fixed ring (35) is fixedly connected to the connection block (34). The fixed ring (35) is provided with a first installation groove (351). The gear ring (38) is placed in the first installation groove (351). The driving motor (36) is slidably connected to the fixed ring (35). The output end of the driving motor (36) is fixedly connected to the fixed gear (37). The fixed gear (37) meshes with the gear ring (38). The driving motor (36) adjacent to the weld detection device (4) is fixedly connected to the weld detection device (4), and the driving motor (36) adjacent to the air leakage detection device (5) is fixedly connected to the air leakage detection device (5).

6. The airtightness detection device for multi-angle welding seams of a ship according to claim 5, characterized in that: The fixed cylinder (41) and the adjacent drive motor (36) are tightly connected. An electromagnetic coil (43), a capacitor (44), a power supply (45) and an ammeter (46) are arranged in the detection housing (42). The electromagnetic coil (43) is connected to the power supply (45) by a wire. The capacitor (44) and the electromagnetic coil (43) are connected in parallel by a wire. The electromagnetic coil (43) and the ammeter (46) are connected by a wire.

7. An airtightness detection device for multi-angle welded joints of a ship according to claim 1, characterized in that: A plurality of second mounting grooves (5251) are provided on the detection plate (525). A first return spring (5252), a first moving plate (5253) and a support plate (5254) are provided on the second mounting groove (5251). The first return spring (5252) is tightly connected to the second mounting groove (5251). One end of the first return spring (5252) away from the second mounting groove (5251) is tightly connected to the first moving plate (5253). The first moving plate (5253) is rotatably connected to the support plate (5254). A plurality of third mounting grooves (5261) are provided on the limit block (526). A second return spring (5262), a moving magnet (5263) and an induction coil are provided on the third mounting groove (5261). The second return spring (5262) is tightly connected to the third mounting groove (5261). One end of the second return spring (5262) away from the third mounting groove (5261) is tightly connected to the moving magnet (5263). An induction coil is provided outside the moving magnet (5263).

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