Multi-angle welding seam airtightness detection equipment for ship

Abstract

The invention discloses marine multi-angle welding seam air tightness detection equipment, and relates to the technical field of air tightness detection.The detection equipment comprises a mounting box, a limiting device, a driving device, a welding seam detection device, an air leakage detection device and a high-pressure air pump, the mounting box is in fastening connection with the limiting device, and the mounting box is in fastening connection with the driving device; the number of the driving devices is two, the two driving devices are fixedly connected with the welding seam detection device and the air leakage detection device respectively, the high-pressure air pump is fixedly connected with the mounting box, a steel pipe is fixed through the limiting device, and the driving devices drive the welding seam detection device to move up and down and move in the radial direction of the steel pipe so as to detect the position of a welding seam on the steel pipe. The driving device drives the gas leakage device to move to the welding seam position according to the position of the welding seam detected by the welding seam detection device, meanwhile, the high-pressure gas pump conveys high-pressure gas into the steel pipe, when gas leakage points exist on the welding seam, the gas is rapidly sprayed out from the gas leakage points, and then the gas leakage detection device detects the gas 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 air tightness 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 by a single sensor, which has the problems of low efficiency and high missed detection rate.

[0003] Especially for welds on steel pipes, soapy water is often applied manually to observe the bubble position at this stage, 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 is difficult to achieve multi-angle adaptive detection of weld leakage positions. 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: A multi-angle welding seam air tightness detection device for ships, the detection device comprises 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 is tightly connected to the limit device, the installation box is tightly connected to the drive device, there are two drive devices, the two drive devices are tightly connected to the weld detection device and the leakage detection device respectively, and the high-pressure air pump is tightly connected to the installation box.

[0006] 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 by a driving device to move up and down and radially along 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 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.

[0007] Furthermore, the installation box is provided with a first installation cavity, a second installation cavity and a connecting 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 leakage detection device is placed in the first installation cavity, the limiting device and the first installation cavity are tightly connected, the driving device and the first installation cavity are tightly connected, the high-pressure air pump is placed in the second installation cavity, the high-pressure air pump and the second installation cavity are tightly connected, the first installation cavity and the second installation cavity are connected through the connecting hole, and the output end of the high-pressure air pump and the connecting hole are tightly connected.

[0008] The first installation cavity serves as the main installation base and is used to provide an installation position for the limiting device, the driving device, the weld detection device and the gas leakage detection device. The second installation cavity provides an installation position for the high-pressure air pump. The connecting hole allows the high-pressure air pump to deliver high-pressure gas to the object to be detected on the limiting device in the first installation cavity, so that the subsequent gas leakage detection device can detect the location of the gas leakage on the weld.

[0009] Furthermore, the limiting device includes a first limiting base, a first limiting table, a second limiting base, a second limiting table and a limiting cylinder. The first limiting base is tightly connected to the first mounting cavity. The first limiting base is provided with an air vent, and the first limiting table is provided with an air inlet. The connecting hole, the air vent and the air inlet are connected in sequence. The first limiting base is tightly connected to the first limiting table, the limiting cylinder is tightly connected to the first mounting cavity, the output end of the limiting cylinder is tightly connected to the second limiting base, the second limiting table is placed in the second limiting base, and the second limiting base and the second limiting table are tightly connected.

[0010] The first limit base is used as an installation base to provide an installation position for the first limit cone, and the second limit base is used as an installation base to provide an installation position for the second limit cone. Before detection, the steel pipe is placed on the first limit cone, and the steel pipes with different apertures can be connected to the first limit cone through the conical surface of the first limit cone. Then the output of the limit cylinder drives the second limit base to move, and the movement of the second limit base drives the second limit cone to move, and finally the second limit cone and the steel pipe are connected at one end away from the first limit cone. The steel pipe is fixed between the first limit cone and the second limit cone by the limit cylinder. When the weld position is detected, an alternating magnetic field is generated by the weld detection device to generate 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, but 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 located by detecting the eddy current change position through the weld detection device.

[0011] Furthermore, the driving device includes a fixed track, a fixed motor, a screw and a connecting block. The fixed track is tightly connected to the first installation cavity, the fixed motor is tightly connected to the first installation cavity, the screw is placed in the fixed track, the output end of the fixed motor is tightly connected to the screw, the screw and the connecting block are threadedly connected, the connecting block connected to the weld detection device is tightly connected to the weld detection device, and the connecting block adjacent to the leakage detection device is tightly connected to the leakage detection device.

[0012] The fixed track serves as an installation basis for the installation and positioning of other components. When it is necessary to drive the weld detection device and the gas leakage detection device to move up and down along the steel pipe, the fixed motor outputs a torque to drive the screw to rotate, and the rotation of the screw drives the connecting block to move up and down. The movement of the connecting block drives the connected weld detection device and the gas leakage detection device to move up and down respectively, so that the weld detection device and the gas leakage detection device can perform comprehensive inspections on the steel pipe.

[0013] Furthermore, the driving device also includes a fixed ring, a driving motor, a fixed gear and a gear ring. The fixed ring and the connecting block are tightly connected. The fixed ring is provided with a first mounting groove, and the gear ring is placed in the first mounting groove. The driving motor and the fixed ring are slidingly connected. The output end of the driving motor and the fixed gear are tightly connected. The fixed gear and the gear ring are meshed. The driving motor connected to the weld detection device is tightly connected to the weld detection device, and the driving motor connected to the leakage detection device is tightly connected to the leakage detection device.

[0014] The fixed ring is used 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 fixed gear is driven to rotate by the torque output by the driving motor. The rotation of the fixed gear interacts with the ring gear, so that the ring gear has a reaction force on the fixed gear, thereby driving the fixed gear to move in the direction of the ring gear. The movement of the fixed gear drives the device connected to the drive motor to move. The movement of the drive motor drives the weld detection device and the air leakage detection device connected to the drive motor to move radially along the steel pipe, thereby realizing radial detection of the steel pipe.

[0015] Furthermore, the weld detection device includes a fixed cylinder and a detection shell, the fixed cylinder and the adjacent drive motor are fastened together, the detection shell and the output end of the fixed cylinder are fastened together, an electromagnetic coil, a capacitor, a power supply and an ammeter are arranged in the detection shell, the electromagnetic coil and the power supply wire are connected, the capacitor and the electromagnetic coil wire are connected in parallel, and the electromagnetic coil and the ammeter wire are connected.

[0016] When it is necessary to detect the position of the weld, the detection housing is moved to the vicinity of the steel pipe surface through the fixed cylinder output. At the same time, the power supply turns on the output current. The current generates an alternating magnetic field through the electromagnetic coil and the capacitor. 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 reacts on the electromagnetic coil, thereby changing the impedance of the electromagnetic coil, causing the current on the electromagnetic coil to change. When the weld is detected, the impedance of the electromagnetic coil is different due to the different eddy currents generated by the weld and the steel pipe. The current value is detected by the ammeter. When the ammeter value is detected to change, the position is the weld position. The weld position can be determined by observing the signal fluctuations. No post-processing is required. It is convenient, simple and fast. At the same time, non-contact detection avoids wear on the steel pipe.

[0017] Furthermore, the air leakage detection device includes a manipulator and a detection element, the manipulator and an adjacent drive motor are tightly connected, and the manipulator and the detection element are tightly connected.

[0018] When it is necessary to detect the leakage point on the weld, the detection angle of the detection element can be adjusted by the manipulator, thereby realizing multi-angle detection and realizing the detection of the leakage point position through the detection element.

[0019] Furthermore, the detection element includes a detection shell, a detection spring, a detection coil, a detection magnet, a detection plate and a limit block. The detection shell is tightly connected to the manipulator, the detection shell is tightly connected to the limit block, the detection spring is placed in the limit block, the detection spring and the detection shell are tightly connected, one end of the detection spring away from the detection shell is tightly 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 and the limit block are slidably connected.

[0020] The position of the leak is detected by moving the detection element at the weld, and the detection housing is used to install and support other components. When there is a leak, the high-pressure gas in the steel pipe makes the gas ejected from the leak faster. When the gas acts on the detection plate, the detection plate is driven to move by the force of the gas, and the movement of the detection plate drives the detection magnet to move, and the movement of the detection magnet drives the detection spring to compress. At the same time, the movement of the detection magnet changes the magnetic flux in the detection coil, thereby generating an induced current. The force generated by the gas acts on the detection plate, and finally generates an induced current. Whether there is a leak at that position is judged based on the presence or absence of the induced current.

[0021] Furthermore, a plurality of second mounting grooves are provided on the detection plate, a first reset spring, a first movable plate and a support plate are provided on the second mounting groove, the first reset spring is fastened to the second mounting groove, one end of the first reset spring away from the second mounting groove is fastened to the first movable plate, the first movable plate and the support plate are rotatably connected, a plurality of third mounting grooves are provided on the limit block, a second reset spring, a movable magnet and an induction coil are provided on the third mounting groove, the second reset spring is fastened to the third mounting groove, one end of the second reset spring away from the third mounting groove is fastened to the movable magnet, and an induction coil is provided outside the movable magnet.

[0022] 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 prone to incorrectly mark the leakage position. 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 reset 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 reset spring to be compressed. At the same time, the movement of the movable magnet changes the magnetic flux in the induction coil, thereby generating an induced current. According to the position where the induced current is generated, the manipulator moves the detection element so that the gas acts on the detection plate in the central area of ​​the detection plate, thereby ensuring the accurate positioning of the leakage position.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 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, which is suitable for the detection of steel pipes.

[0024] 2. Using electromagnetic eddy current detection technology, an alternating magnetic field is generated through 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.

[0025] 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.

[0026] 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 manipulator is driven to automatically adjust the detection angle, thereby achieving accurate positioning of the leakage point. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the installation box of the present invention; Figure 2 It is a schematic diagram of the internal structure of the installation box of the present invention; Figure 3 It is a schematic diagram of the structure of the limiting device of the present invention; Figure 4 It is a schematic diagram of the structure of the driving device of the present invention; Figure 5 It is a schematic diagram of the detection housing structure of the present invention; Figure 6 It is a schematic structural diagram of the gas leakage detection device of the present invention; Figure 7 It is a schematic diagram of the structure of the detection element of the present invention; Figure 8 for Figure 7 A magnified view of a part A; Fig. 9 for Figure 7 Enlarged view of local B.

[0028] In the figure: 1, installation box; 11, first installation cavity; 12, second installation cavity; 13, connection hole; 2, limit device; 21, first limit base; 211, vent hole; 22, first limit round table; 221, air inlet hole; 23, second limit base; 24, second limit round table; 25, limit cylinder; 3, drive device; 31, fixed track; 32, fixed motor; 33, screw; 34, connection block; 35, fixed ring; 351, first installation groove; 36, drive motor; 37, fixed gear; 38, gear ring; 4, weld detection device; 41, fixed gas Cylinder; 42, detection shell; 43, electromagnetic coil; 44, capacitor; 45, power supply; 46, ammeter; 5, leakage detection device; 51, manipulator; 52, detection element; 521, detection shell; 522, detection spring; 523, detection coil; 524, detection magnet; 525, detection plate; 5251, second mounting groove; 5252, first return spring; 5253, first moving plate; 5254, support plate; 526, limit block; 5261, third mounting groove; 5262, second return spring; 5263, moving magnet; 6, high-pressure air pump. DETAILED DESCRIPTION

[0029] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0030] Example: Figure 1-Figure 9As shown, the present invention provides a technical solution for a multi-angle welding seam air tightness detection device for ships. The detection device includes an installation box 1, a limit device 2, a drive device 3, a weld detection device 4, a leakage detection device 5 and a high-pressure air pump 6. The installation box 1 is tightly connected to the limit device 2, the installation box 1 is tightly connected to the drive device 3, there are two drive devices 3, the two drive devices 3 are tightly connected to the weld detection device 4 and the leakage detection device 5 respectively, and the high-pressure air pump 6 is tightly connected to the installation box 1.

[0031] The installation box 1 is used as the main installation base for the installation and positioning of other devices. The steel pipe is fixed by the limit device 2, and the weld detection device 4 is driven by the driving device 3 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 device 5 to move to the weld position. At the same time, the high-pressure air pump 6 transports 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 5 detects the leakage position.

[0032] like Figure 1-Figure 3 As shown, the installation box 1 is provided with a first installation cavity 11, a second installation cavity 12 and a connecting 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 tightly connected, the driving device 3 and the first installation cavity 11 are tightly 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 tightly connected, the first installation cavity 11 and the second installation cavity 12 are connected through the connecting hole 13, and the output end of the high-pressure air pump 6 and the connecting hole 13 are tightly connected.

[0033] The first installation cavity 11 is used as the main installation base to provide an installation position 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. The connecting hole 13 allows the high-pressure air pump 6 to deliver high-pressure gas to the object 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 location of the leakage on the weld.

[0034] like Figure 2-Figure 3As shown, the limiting device 2 includes a first limiting base 21, a first limiting table 22, a second limiting base 23, a second limiting table 24 and a limiting cylinder 25. The first limiting base 21 is fastened to the first mounting cavity 11. The first limiting base 21 is provided with an air vent 211. The first limiting table 22 is provided with an air inlet 221. The connecting hole 13, the air vent 211 and the air inlet 221 are connected in sequence. The first limiting base 21 is fastened to the first limiting table 22. The limiting cylinder 25 is fastened to the first mounting cavity 11. The output end of the limiting cylinder 25 is fastened to the second limiting base 23. The second limiting table 24 is placed in the second limiting base 23. The second limiting base 23 and the second limiting table 24 are fastened to each other.

[0035] The first limiting base 21 is used as an installation base to provide an installation position for the first limiting truncated platform 22, and the second limiting base 23 is used as an installation base to provide an installation position for the second limiting truncated platform 24. Before testing, the steel pipe is placed on the first limiting truncated platform 22, and the conical surface of the first limiting truncated platform 22 allows steel pipes with different apertures to be connected to the first limiting truncated platform 22. Then, the output of the limiting cylinder 25 drives the second limiting base 23 to move, and the movement of the second limiting base 23 drives the second limiting truncated platform 24 to move, so that the second limiting truncated platform 24 and the steel pipe are finally in contact with each other. The tube is connected at one end away from the first limit cone 22, and the steel tube is fixed between the first limit cone 22 and the second limit cone 24 by the limit cylinder 25. When the weld position detection starts, an alternating magnetic field is generated by the weld detection device 4 to generate eddy currents in the steel tube. Since the material structure of the steel tube itself is the same, the eddy currents generated by the steel tube are relatively uniform and stable. However, the magnetic field generated by the weld is different from the eddy currents generated by the steel tube due to the uneven material. The weld position is accurately located by detecting the eddy current change position through the weld detection device 4.

[0036] like Figure 2-Figure 4 As shown, the driving device 3 includes a fixed rail 31, a fixed motor 32, a screw 33 and a connecting block 34. The fixed rail 31 is fastened to the first installation cavity 11, the fixed motor 32 is fastened to the first installation cavity 11, the screw 33 is placed in the fixed rail 31, the output end of the fixed motor 32 is fastened 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 fastened to the weld detection device 4, and the connecting block 34 adjacent to the leakage detection device 5 is fastened to the leakage detection device 5.

[0037] The fixed rail 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 gas leakage detection device 5 to move up and down along the steel pipe, the fixed motor 32 outputs a 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 the gas leakage detection device 5 to move up and down respectively, so that the weld detection device 4 and the gas leakage detection device 5 can perform comprehensive inspections on the steel pipe.

[0038] like Figure 2-Figure 4 and Figure 6 As shown, the driving device 3 also includes a fixed ring 35, a driving motor 36, a fixed gear 37 and a ring gear 38. The fixed ring 35 is tightly connected to the connecting block 34. The fixed ring 35 is provided with a first mounting groove 351. The ring gear 38 is placed in the first mounting groove 351. The driving motor 36 is slidably connected to the fixed ring 35. The output end of the driving motor 36 is tightly connected to the fixed gear 37. The fixed gear 37 is meshed with the ring gear 38. The driving motor 36 connected to the weld detection device 4 is tightly connected to the weld detection device 4. The driving motor 36 connected to the leakage detection device 5 is tightly connected to the leakage detection device 5.

[0039] The fixed ring 35 is used 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 fixed gear 37 is driven to rotate by outputting a torque through the drive motor 36. The rotation of the fixed gear 37 interacts with the ring gear 38, so that the ring gear 38 has a reaction force on the fixed gear 47, thereby driving the fixed gear 37 to move along the direction of the ring gear 38. The movement of the fixed gear 37 drives the device connected to the drive motor 36 to move. The movement of the drive motor 36 drives the weld detection device 4 and the air leakage detection device 5 connected to the drive motor 36 to move radially along the steel pipe, thereby realizing radial detection of the steel pipe.

[0040] like Figure 4 and Figure 5 As shown, the weld detection device 4 includes a fixed cylinder 41 and a detection shell 42. The fixed cylinder 41 is fastened to the adjacent drive motor 36, and the detection shell 42 is fastened 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 arranged in the detection shell 42. The electromagnetic coil 43 and the power supply 45 are connected by wires, the capacitor 44 and the electromagnetic coil 43 are connected in parallel by wires, and the electromagnetic coil 43 and the ammeter 46 are connected by wires.

[0041] When it is necessary to detect the weld position, the detection housing 42 is moved to the vicinity of the steel pipe surface through the output of the fixed cylinder 41, and the power supply 45 turns on the output current. The current generates an alternating magnetic field through the electromagnetic coil 43 and the capacitor 44. The alternating magnetic field penetrates the steel pipe surface and generates eddy currents inside the steel pipe. The secondary magnetic field generated by the eddy currents reacts on the electromagnetic coil 43, thereby changing the impedance of the electromagnetic coil 43, causing the current on the electromagnetic coil 43 to change. When the weld is detected, the impedance of the electromagnetic coil 43 is different due to the different eddy currents generated by the weld and the steel pipe. The current value is detected by the ammeter 46. When the value of the ammeter 46 is detected to change, the position is the weld position. The weld position can be determined by observing the signal fluctuations without the need for post-processing. It is convenient, simple and fast. At the same time, non-contact detection avoids wear on the steel pipe.

[0042] like Figure 3 and Figure 6 As shown, the air leakage detection device 5 includes a manipulator 51 and a detection element 52 . The manipulator 51 and the adjacent driving motor 36 are tightly connected. The manipulator 51 and the detection element 52 are tightly connected.

[0043] When it is necessary to detect the leak point on the weld, the detection angle of the detection element 52 can be adjusted by the manipulator 51, so as to realize multi-angle detection, and the position of the leak point can be detected by the detection element 52.

[0044] like Figure 7 As shown, the detection element 52 includes a detection shell 521, a detection spring 522, a detection coil 523, a detection magnet 524, a detection plate 525 and a limit block 526. The detection shell 521 is fastened to the manipulator 51, the detection shell 521 is fastened to the limit block 526, the detection spring 522 is placed in the limit block 526, the detection spring 522 is fastened to the detection shell 521, the end of the detection spring 522 away from the detection shell 521 is fastened to the detection magnet 524, the detection coil 523 is placed on the outside of the limit block 526, the detection magnet 524 is hinged to the detection plate 525 away from the end of the detection spring 522, and the detection magnet 524 is slidably connected to the limit block 526.

[0045] The position of the leak is detected by moving the detection element 52 at the weld, and the detection housing 521 is used to install and support other components. When there is a leak, the high-pressure gas in the steel pipe makes the gas ejected from the leak faster. 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 detection magnet 524 to move. The movement of the detection magnet 524 drives the detection spring 522 to be compressed. At the same time, the movement of the detection magnet 524 changes the magnetic flux in the detection coil 523, thereby generating an induced current. The force generated by the gas acts on the detection plate 525, and finally generates an induced current. Whether there is a leak at that position is determined based on the presence or absence of the induced current.

[0046] like Figure 7-Figure 9 As shown, the detection plate 525 is provided with a plurality of second mounting grooves 5251, the second mounting groove 5251 is provided with a first return spring 5252, a first movable plate 5253 and a support plate 5254, the first return spring 5252 and the second mounting groove 5251 are fastened together, the first return spring 5252 is fastened together with the first movable plate 5253 at one end away from the second mounting groove 5251, the first movable plate 5253 and the support plate 5254 are rotatably connected, the limit block 526 is provided with a plurality of third mounting grooves 5261, the third mounting groove 5261 is provided with a second return spring 5262, a movable magnet 5263 and an induction coil, the second return spring 5262 and the third mounting groove 5261 are fastened together, the second return spring 5262 is fastened together with the one end away from the third mounting groove 5261 and the movable magnet 5263, and an induction coil is arranged outside the movable magnet 5263.

[0047] When the position of the force of the gas at the leakage position is not in the central area of ​​the detection plate 525, the detection plate 525 is likely to mark the leakage position incorrectly. 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 support plate 5254 presses down to drive the first movable plate 5253. The second movable plate 5253 moves to drive the first return spring 5252 to be compressed. At the same time, the support plate 5254 presses down to drive the movable magnet 5263 on the third mounting groove 5261 to move. The movement of the movable magnet 5263 drives the second return spring 5262 to be compressed. At the same time, the movement of the movable magnet 5263 changes 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 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 leakage position.

[0048] The working principle of the present invention is as follows: the limit device 2 fixes the steel pipe, and 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. When detecting the position of the weld, the fixed cylinder 41 outputs and drives the detection shell 42 to move near the surface of the steel pipe. At the same time, the power supply 45 turns on the output current. The current generates an alternating magnetic field through the electromagnetic coil 43 and the capacitor 44. 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 current will react on the electromagnetic coil 43, thereby changing the impedance of the electromagnetic coil 43, causing the current on the electromagnetic coil 43 to change. When the weld is detected, the eddy currents generated by the weld and the steel pipe are different, resulting in different impedances of the electromagnetic coil 43. The current value is detected by the ammeter 46. When the value of the ammeter 46 is detected to change, the position is It is the weld position. According to the weld position detected by the weld detection device 4, the driving device 3 drives the leakage device 5 to move to the weld position. At the same time, the high-pressure air pump 6 transports high-pressure gas to the inside of the steel pipe. When there is a leak on the weld, due to the high-pressure gas in the steel pipe, the gas ejected from the leak position is faster. When the gas acts on the detection plate 525, the force of the gas on the detection plate 525 drives the detection plate 525 to move. 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 be compressed. At the same time, the movement of the detection magnet 524 changes the magnetic flux in the detection coil 523, thereby generating an induced current. The force generated by the gas acts on the detection plate 525, and finally generates an induced current. According to the presence or absence of the induced current, it is judged whether there is a leak at this position.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-angle welding seam air tightness detection device for ships, characterized in that: The detection device comprises an installation box (1), a limit device (2), a drive device (3), a weld detection device (4), a gas leakage detection device (5) and a high-pressure air pump (6); the installation box (1) and the limit device (2) are tightly connected; the installation box (1) and the drive device (3) are tightly connected; there are two drive devices (3); the two drive devices (3) are tightly connected to the weld detection device (4) and the gas leakage detection device (5) respectively; and the high-pressure air pump (6) is tightly connected to the installation box (1).

2. The multi-angle welding seam air tightness detection equipment for ships according to claim 1 is characterized in that: The installation box (1) is provided with a first installation cavity (11), a second installation cavity (12) and a connecting 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 tightly connected; the driving device (3) and the first installation cavity (11) are tightly 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 tightly connected; the first installation cavity (11) and the second installation cavity (12) are connected via the connecting hole (13); and the output end of the high-pressure air pump (6) and the connecting hole (13) are tightly connected.

3. The multi-angle welding seam air tightness detection equipment for ships according to claim 2 is characterized in that: The limiting device (2) comprises a first limiting base (21), a first limiting truncated platform (22), a second limiting base (23), a second limiting truncated platform (24) and a limiting cylinder (25); the first limiting base (21) is tightly connected to the first installation cavity (11); a vent hole (211) is provided on the first limiting base (21); an air inlet hole (221) is provided on the first limiting truncated platform (22); the connection hole (13), the vent hole (211) and the air inlet hole (221) are sequentially connected; the first limiting base (21) is tightly connected to the first limiting truncated platform (22); the limiting cylinder (25) is tightly connected to the first installation cavity (11); the output end of the limiting cylinder (25) is tightly connected to the second limiting base (23); the second limiting truncated platform (24) is disposed in the second limiting base (23); and the second limiting base (23) and the second limiting truncated platform (24) are tightly connected.

4. The multi-angle welding seam air tightness detection equipment for ships according to claim 2 is characterized in that: The driving device (3) comprises a fixed rail (31), a fixed motor (32), a screw (33) and a connecting block (34); the fixed rail (31) is tightly connected to the first installation cavity (11); the fixed motor (32) is tightly connected to the first installation cavity (11); the screw (33) is placed in the fixed rail (31); the output end of the fixed motor (32) is tightly 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 tightly connected to the weld detection device (4); and the connecting block (34) adjacent to the gas leakage detection device (5) is tightly connected to the gas leakage detection device (5).

5. The multi-angle welding seam air tightness detection equipment for ships according to claim 4 is characterized in that: The driving device (3) further comprises a fixed circular ring (35), a driving motor (36), a fixed gear (37) and a gear ring (38); the fixed circular ring (35) and the connecting block (34) are tightly connected; a first mounting groove (351) is provided on the fixed circular ring (35); the gear ring (38) is disposed in the first mounting groove (351); the driving motor (36) and the fixed circular ring (35) are slidably connected; an output end of the driving motor (36) and the fixed gear (37) are tightly connected; the fixed gear (37) and the gear ring (38) are meshed; the driving motor (36) connected to the weld detection device (4) is tightly connected to the weld detection device (4); and the driving motor (36) connected to the gas leakage detection device (5) is tightly connected to the gas leakage detection device (5).

6. The multi-angle welding seam air tightness detection equipment for ships according to claim 5 is characterized in that: The weld detection device (4) comprises a fixed cylinder (41) and a detection housing (42); the fixed cylinder (41) is tightly connected to an adjacent drive motor (36); the detection housing (42) is tightly connected to an output end of the fixed cylinder (41); 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) and the power supply (45) are connected by wires; the capacitor (44) and the electromagnetic coil (43) are connected by wires in parallel; and the electromagnetic coil (43) and the ammeter (46) are connected by wires.

7. The multi-angle welding seam air tightness detection equipment for ships according to claim 5 is characterized by: The air leakage detection device (5) comprises a manipulator (51) and a detection element (52); the manipulator (51) is tightly connected to an adjacent drive motor (36); and the manipulator (51) is tightly connected to the detection element (52).

8. The multi-angle welding seam air tightness detection equipment for ships according to claim 7 is characterized by: The detection element (52) comprises 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) and the manipulator (51) are tightly connected; the detection housing (521) and the limit block (526) are tightly connected; the detection spring (522) is placed in the limit block (526); the detection spring (522) and the detection housing (521) are tightly connected; one end of the detection spring (522) away from the detection housing (521) is tightly 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) and the limit block (526) are slidably connected.

9. The multi-angle welding seam air tightness detection equipment for ships according to claim 8, characterized in that: The detection plate (525) is provided with a plurality of second mounting grooves (5251), and the second mounting grooves (5251) are provided with a first return spring (5252), a first movable plate (5253) and a support plate (5254). The first return spring (5252) and the second mounting grooves (5251) are fastened together, and one end of the first return spring (5252) away from the second mounting grooves (5251) is fastened together with the first movable plate (5253), and the first movable plate (5253) and the support plate (5254) are fastened together. 4) Rotational connection, the limit block (526) is provided with a plurality of third mounting grooves (5261), the third mounting groove (5261) is provided with a second return spring (5262), a movable magnet (5263) and an induction coil, the second return spring (5262) ​​and the third mounting groove (5261) are fastened to each other, the end of the second return spring (5262) ​​away from the third mounting groove (5261) is fastened to the movable magnet (5263), and the movable magnet (5263) is provided with an induction coil outside.

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