Welding seam detection device for magnetic suspension traffic low-vacuum pipeline

Abstract

The invention belongs to the technical field of welding seam detection, and particularly relates to a welding seam detection device for a magnetic levitation traffic low-vacuum pipeline, which is characterized in that a helium mass spectrum leakage detection structure is arranged on the outer side of the vacuum pipeline, a helium inflation structure is arranged on the inner side of the vacuum pipeline, and a rolling structure is arranged at the bottom end of the vacuum pipeline and comprises a third base; supports are symmetrically fixed to the two sides of the top face of the third base, V-shaped frames are hinged to each support in a bilateral symmetry mode, rollers are connected between the ends of the two V-shaped frames, the two ends of a rotating shaft of each roller penetrate through the two V-shaped frames respectively and are rotationally connected with the contact positions of the two V-shaped frames, one end of each roller penetrates through the corresponding V-shaped frame and is fixedly provided with a first gear, and protective covers are fixed to the end faces of the V-shaped frames; a gear motor is fixedly installed on the outer end face of the protective cover, an output shaft of the gear motor penetrates through the protective cover to fix a second gear, the second gear is meshed with the first gear, and the two rolling structures are arranged in a mirror symmetry mode. The device does not need to lay a leak detection tool around a welding seam, facilitates leak detection, improves leak detection efficiency, and improves leak detection accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of weld detection, and in particular relates to a weld detection device for a magnetic levitation transportation low vacuum pipeline. Background Art

[0002] Maglev transportation uses a (low) vacuum pipe as the outer shell, so that the maglev transportation track is set inside the pipe shell, and the maglev vehicle runs in a near-vacuum environment. Since the pipe is near-vacuum, the wind resistance of the maglev vehicle is greatly reduced during operation, achieving a higher speed and forming a high-speed maglev rail transportation.

[0003] The vacuum pipeline is welded from multiple round tubes. When laying the vacuum pipeline, 3-5 round tubes are welded into a section of the pipeline, and then they are welded and laid one section at a time. After each section of the pipeline is welded, its welds need to be leak-tested before laying. For product welds with high requirements for vacuum sealing performance, the helium mass spectrometer negative pressure vacuum leak detection method is usually used. The equipment components used in this leak detection method include helium mass spectrometer leak detector, bellows, leak detection tooling, helium filling pipelines, etc. When leak testing, connect the long strip leak detection tooling to the helium mass spectrometer leak detector through a bellows, knead the vacuum seal into long strips and apply them to the edge of the leak detection tooling slot, then press it on the weld to be tested, turn on the helium mass spectrometer leak detector vacuum pump to evacuate, slowly blow helium along the weld on the other side, and record the leak detector reading. The advantage of this method is high accuracy, and the disadvantages are as follows: (1) Under low temperature conditions, the hardness of the vacuum seal increases and it is not easy to deform; when the temperature is high, the seal becomes soft and is sucked back into the tooling by negative pressure during the vacuuming process. This method is greatly affected by temperature and is inconvenient for leak detection; (2) Each time a weld is inspected, vacuum sealant must be reapplied and vacuum pumped, which is a cumbersome process; (3) The vacuum pipeline has many welds and long lines, making it difficult to install leak detection tools. The existing technical means consume a large amount of helium and have low leak detection efficiency, which cannot meet the leak detection progress requirements; (4) During the leak detection process, due to the obstruction of the vacuum pipe wall, the leak detection tooling cannot be accurately positioned when laid, and there is a situation where the leak detection tooling inside and outside the vacuum pipe is misaligned with each other. The helium gas slowly sprayed along the weld cannot be detected by the helium mass spectrometer leak detector, affecting the detection accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a weld detection device for a magnetic levitation transportation low vacuum pipeline, so as to solve the problems in the prior art that the leak detection tooling is greatly affected by temperature, the leak detection steps are cumbersome, the leak detection efficiency is low, and the leak detection tooling inside and outside the vacuum pipeline is misaligned with each other.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A weld detection device for a low-vacuum pipeline of a magnetic levitation transportation comprises a rolling structure, a helium mass spectrometer leak detection structure and a helium inflation structure. The helium mass spectrometer leak detection structure is placed outside the vacuum pipeline, the helium inflation structure is placed inside the vacuum pipeline, the helium mass spectrometer leak detection structure and the helium inflation structure are used for leak detection of the vacuum pipeline, two rolling structures are placed at the bottom of the vacuum pipeline, and the rolling structures are used for rolling the vacuum pipeline.

[0006] Preferably, the rolling structure includes a third base, and supports are fixed on both sides of the top surface of the third base in a mirror-symmetrical manner along the central vertical plane of the vacuum pipe. Each of the supports is symmetrically hinged with a V-shaped frame through a pin shaft, and rollers are connected between the ends of the two V-shaped frames. The two ends of the rotating shaft of the roller respectively penetrate the two V-shaped frames and are rotatably connected with the contact points, one end of which penetrates the V-shaped frame and fixes the first gear, and a protective cover is fixed on the end surface of the V-shaped frame on the side where the first gear is fixed. The first gear is placed in the protective cover, and a reduction motor is fixedly installed on the outer end surface of the protective cover, and the output shaft of the reduction motor penetrates the protective cover to fix the second gear, and the second gear is arranged between the two first gears, and the second gear is meshed with the first gear, and the two rolling structures are arranged in a mirror-symmetrical manner.

[0007] Preferably, the helium mass spectrometer leak detection structure includes a first base, a helium mass spectrometer leak detector is fixed on one side of the top surface of the first base, and a support frame is symmetrically fixed on the other side of the top surface of the first base along the extension line of the center line of the helium mass spectrometer leak detector, first arc plates are respectively fixed on the top of two of the support frames, and the ends of the two first arc plates are fixedly connected by two first connecting rods, the inner circle diameter of the first arc plate matches the outer circle diameter of the vacuum pipe, and a number of balls are evenly inlaid on the inner arc surface of the first arc plate, two ports of a U-shaped plate are fixed on the outer arc surface of each first arc plate, and a first hydraulic cylinder is fixedly installed on the side wall of the U-shaped plate away from the first arc plate, the telescopic ends of the two first hydraulic cylinders penetrate the U-shaped plate and are fixed to the same rectangular connecting frame, and first guide rods are respectively fixed on both sides of the upper and lower ends of the rectangular connecting frame. The other end of the first guide rod penetrates the U-shaped plate and is slidably connected thereto, and the rectangular connecting frame is fixed with a suction gun cover box through a first connecting block near the middle of one side of the vacuum pipe, and the suction gun cover box is in the shape of a long strip, and the suction gun cover box is in an arc shape facing the side of the vacuum pipe, and is tightly fitted with the outer arc surface of the vacuum pipe, and a sealing strip is provided on the side of the suction gun cover box facing the vacuum pipe, and the first connecting pipe is fixedly connected to the side wall of the suction gun cover box away from the vacuum pipe, one end of the first connecting pipe is communicated with the internal cavity of the suction gun cover box, and the other end is communicated with the suction port of the helium mass spectrometer leak detector through a suction pipe, and a cavity is fixedly sleeved around the joint between the suction gun cover box and the outer wall of the vacuum pipe, the cavity is tightly fitted with the outer arc surface of the vacuum pipe facing the side of the vacuum pipe, and a sealing strip is provided on the side of the cavity facing the vacuum pipe, and magnet blocks are respectively fixed at the four corners of the cavity.

[0008] Preferably, a push plate is slidably provided in the cavity, and first electric telescopic rods are fixedly installed on the side walls at the four corners of the cavity, and the telescopic end of the first electric telescopic rod penetrates the outer wall of the cavity and extends into its internal cavity and is fixedly connected to the push plate. First plug holes are symmetrically provided on the cavity side walls on the left and right sides of the suction gun cover box, and second plug holes corresponding to the first plug holes are also provided on the push plate side walls. Second connecting rods are symmetrically fixed up and down with the first plug holes on the cavity side walls on the left and right sides of the suction gun cover box, and the top ends of the two second connecting rods on each side are fixed by arc-shaped mounting plates, and the two arc-shaped mounting plates are symmetrically arranged in a mirror-like manner. A second hydraulic cylinder is fixedly installed, the telescopic end of the second hydraulic cylinder penetrates the arc-shaped mounting plate and fixes the second connecting block, an arc-shaped connecting plate is fixed on the side wall of the second connecting block, a U-shaped bracket is fixed on the bottom end of the arc-shaped connecting plate, a circular plate is fixed on the top end of the arc-shaped connecting plate, a second electric telescopic rod is fixedly installed on the side wall of the circular plate, the telescopic end of the second electric telescopic rod penetrates the circular plate and fixes a pressure plate, a silicone sealing hose is provided between the circular plate and the U-shaped bracket, a plug is installed at the outlet of the silicone sealing hose, the plug is arranged opposite to the first plug hole, and the pressure plate is inserted into the tail end of the silicone sealing hose and fits with the piston in the silicone sealing hose.

[0009] Preferably, the helium inflation structure includes a working platform, which is placed at the bottom end of the vacuum pipe, the bottom surface of the working platform is arc-shaped corresponding to the arc surface inside the vacuum pipe, and a plurality of balls are evenly inlaid on the arc-shaped bottom surface of the working platform, two second guide rods are fixed to the side of one end of the working platform, the other ends of the two second guide rods both penetrate the support plate, guide cylinders are slidably sleeved outside the second guide rods, the guide cylinders are fixed to the support plate, the support plate is arranged outside the vacuum pipe, and the second base is fixed to the bottom end of the support plate.

[0010] Preferably, a helium inflator is fixedly placed on the top surface of the working platform, two second arc-shaped plates are symmetrically fixed on the side wall of the working platform, the top ends of the two second arc-shaped plates are fixed by a connecting plate, a funnel-shaped material box is fixed on the top surface of the connecting plate, a closing plug plate is inserted into the material discharge pipe of the funnel-shaped material box, iron powder is filled in the funnel-shaped material box, arc-shaped slide grooves are provided on the inner end surfaces of the second arc-shaped plates, arc-shaped mounting frames are slidably connected in the arc-shaped slide grooves on both sides, two handles are fixed on the upper and lower inner arc surface of the arc-shaped mounting frame, and two ends of the n-type plate are fixed at the center of the inner arc surface of the arc-shaped mounting frame. A third hydraulic cylinder is fixed on the side wall of the n-type plate away from the arc-shaped mounting frame, and the telescopic end of the third hydraulic cylinder penetrates the n-type plate and fixes the helium cover box. The helium cover box is in a long strip shape, and the side of the helium cover box facing the inner arc surface of the vacuum pipe is in an arc shape and is tightly fitted with the inner arc surface of the vacuum pipe. A sealing strip is provided on the side of the helium cover box facing the inner arc surface of the vacuum pipe. A second connecting pipe is fixedly connected to the side wall of the helium cover box away from the vacuum pipe, one end of the second connecting pipe is communicated with the internal cavity of the helium cover box, and the other end of the second connecting pipe is communicated with the inflation port of the helium inflator through the inflation pipe.

[0011] Preferably, the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are respectively connected to an external hydraulic station pipeline through a conduit.

[0012] Preferably, the helium mass spectrometer leak detector, the first electric telescopic rod, the second electric telescopic rod, the helium inflator and the reduction motor are electrically connected to an external power supply through wires, respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting up the rolling structure, the vacuum pipe is driven to roll slowly. During the weld leak detection process, the helium mass spectrometer leak detector only needs to detect leaks at a fixed point on one side of the vacuum pipe. When changing the weld leak detection position, the vacuum pipe is rolled by the rolling structure. The workers do not need to lay the leak detection tooling around the weld, which makes it easier to lay the leak detection tooling, simplifies the steps of laying the leak detection tooling, facilitates leak detection, and improves the leak detection efficiency. (2) By setting the outer cavity of the suction gun cover box, the sealant in the silicone sealant tube is squeezed into the cavity through the plug nozzle, and the outer periphery of the contact between the suction gun cover box and the vacuum pipe is sealed by the sealant in the cavity. When the sealant solidifies and forms, it seals the contact between the suction gun cover box and the suction gun cover box. The vacuum suction inside the suction gun cover box improves its sealing effect, which indirectly improves the accuracy of weld leak detection. The use of sealant for sealing is not affected by temperature and is convenient for leak detection. (3) By setting the magnet blocks at the four corners of the cavity, the iron powder spilled from the funnel-shaped discharge box is adsorbed and fixed on the inner wall of the vacuum pipe by the four magnet blocks. The specific position of the suction gun cover box outside the vacuum pipe is determined by observing the positions of the adsorbed iron powder at four locations on the inner wall of the vacuum pipe. The helium cover box inside the vacuum pipe and the suction gun cover box outside the vacuum pipe are relatively matched to avoid misalignment of the helium cover box and the suction gun cover box inside and outside the vacuum pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 It is a three-dimensional diagram of the rolling structure in the present invention; Figure 4 is a cross-sectional view of the protective cover of the present invention; Figure 5 It is a three-dimensional diagram of the helium mass spectrometer leak detection structure in the present invention; Figure 6 It is a cross-sectional view of the helium mass spectrometer leak detection structure of the present invention; Figure 7 For the present invention Figure 6 A partial enlarged view in FIG. Figure 8 It is a partial structural schematic diagram of the helium mass spectrometer leak detection structure in the present invention; Fig. 9 It is a cross-sectional view of a part of the structure of the helium mass spectrometer leak detection structure of the present invention; Fig.10 A three-dimensional diagram of the helium-filled structure of the present invention; Fig.11 A cross-sectional view showing the positional relationship between the helium inflation structure and the rolling structure in the present invention; Fig.12 It is a cross-sectional view of the overall structure of the present invention.

[0015] Explanation of reference numerals: 1. vacuum pipe; 2. helium mass spectrometer leak detection structure; 3. first base; 4. helium mass spectrometer leak detector; 5. support frame; 6. first arc plate; 7. first connecting rod; 8. U-shaped plate; 9. first hydraulic cylinder; 10. rectangular connecting frame; 11. first guide rod; 12. first connecting block; 13. suction gun cover box; 14. first connecting pipe; 15. cavity; 16. push plate; 17. first electric telescopic rod; 18. first plug hole; 19. second plug hole; 20. suction pipe; 21. arc-shaped mounting plate; 22. second connecting rod; 23. second hydraulic cylinder; 24. second connecting block; 25. arc-shaped connecting plate; 26. U-shaped bracket; 27. round plate; 28. second electric telescopic rod; 29. ​​pressure plate; 30. Silicone sealing hose; 31. Plug; 32. Helium inflation structure; 33. Working platform; 34. Support plate; 35. Guide cylinder; 36. Second guide rod; 37. Second base; 38. Helium inflator; 39. Second arc plate; 40. Connecting plate; 41. Funnel-shaped unloading box; 42. Closed plug plate; 43. Arc mounting frame; 44. Arc slide; 45. Second gear; 46. Handle; 47. N-type plate; 48. Third hydraulic cylinder; 49. Helium cover box; 50. Second connecting pipe; 51. Inflating pipe; 52. Rolling structure; 53. Third base; 54. Support; 55. V-shaped frame; 56. Roller; 57. First gear; 58. Protective cover; 59. Speed ​​reducer; 60. Magnet block. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1-2 As shown, a weld detection device for a magnetic levitation transportation low vacuum pipeline comprises a rolling structure 52, a helium mass spectrometer leak detection structure 2 and a helium gas-filled structure 32, wherein the helium mass spectrometer leak detection structure 2 is placed on the outside of the vacuum pipeline 1, the helium gas-filled structure 32 is placed on the inside of the vacuum pipeline 1, and the two rolling structures 52 are placed on the bottom of the vacuum pipeline 1; weld leak detection is performed by combining the helium mass spectrometer leak detection structure with the helium gas-filled structure to improve leak detection accuracy; when the weld leak detection position is changed, the vacuum pipeline is rolled by the rolling structure to avoid workers laying leak detection tools around the weld, thereby simplifying the steps for laying leak detection tools, facilitating leak detection, and improving leak detection efficiency.

[0018] A further embodiment of the present invention is as follows: Figure 3-4As shown, the rolling structure 52 includes a third base 53, and both sides of the top surface of the third base 53 are mirror-symmetrically fixed with supports 54 along the central vertical plane of the vacuum pipe 1. V-shaped frames 55 are hinged on each support 54 through a pin shaft, and rollers 56 are connected between the ends of the two V-shaped frames 55. The two ends of the rotating shaft of the roller 56 respectively penetrate the two V-shaped frames 55 and are rotatably connected with the contact points, one end of which penetrates the V-shaped frame 55 and fixes the first gear 57. A protective cover 58 is fixed on the end surface of the V-shaped frame 55 on the side where the first gear 57 is fixed. The first gear 57 is placed in the protective cover 58, and a reduction motor 59 is fixedly installed on the outer end surface of the protective cover 58. The output shaft of the reduction motor 59 penetrates the protective cover 58 to fix the second gear 45. The second gear 45 is arranged between the two first gears 57, and the second gear 45 is meshed with the first gear 57. The two rolling structures 52 are mirror-symmetrically arranged; gear transmission is performed by combining the first gear and the second gear to improve the transmission accuracy.

[0019] A further embodiment of the present invention is as follows: Figure 5-9 As shown, the helium mass spectrometer leak detection structure 2 includes a first base 3, a helium mass spectrometer leak detector 4 is fixed on one side of the top surface of the first base 3, and a support frame 5 is symmetrically fixed on the other side of the top surface of the first base 3 along the extension line of the center line of the helium mass spectrometer leak detector 4, and the first arc plates 6 are respectively fixed on the top of the two support frames 5. The ends of the two first arc plates 6 are fixedly connected by two first connecting rods 7. The inner circle diameter of the first arc plate 6 matches the outer circle diameter of the vacuum pipe 1, and a number of balls are evenly inlaid on the inner arc surface of the first arc plate 6. Two ports of a U-shaped plate 8 are fixed on the outer arc surface of each first arc plate 6. First hydraulic cylinders 9 are fixedly installed on the side walls of the U-shaped plate 8 away from the first arc plate 6. The telescopic ends of the two first hydraulic cylinders 9 penetrate the U-shaped plate 8 and are fixed to the same rectangular connecting frame 10. First guide rods 11 are respectively fixed on both sides of the upper and lower ends of the rectangular connecting frame 10. The other end of the first guide rod 11 penetrates the U-shaped plate 8 and is slidably connected to it. The rectangular connecting frame 10 is close to one side of the vacuum pipe 1 The suction gun cover box 13 is fixed in the middle by the first connecting block 12. The suction gun cover box 13 is in the shape of a long strip. The suction gun cover box 13 is in the shape of an arc on the side facing the vacuum pipe 1 and is tightly fitted with the outer arc surface of the vacuum pipe 1. A sealing strip is provided on the side facing the vacuum pipe 1 of the suction gun cover box 13. The side wall of the suction gun cover box 13 away from the vacuum pipe 1 is fixedly connected to the first connecting pipe 14. One end of the first connecting pipe 14 is connected to the internal cavity of the suction gun cover box 13, and the other end is connected to the helium mass spectrometer leak detector 4 through the suction pipe 20. The air inlet is connected, and a cavity 15 is fixedly sleeved around the joint between the suction gun cover box 13 and the outer wall of the vacuum pipe 1. The cavity 15 is tightly fitted with the outer arc surface of the vacuum pipe 1 on the side facing the vacuum pipe 1, and a sealing strip is provided on the side facing the vacuum pipe 1. Magnet blocks 60 are respectively fixed at the four corners of the cavity 15. The use of sealant is not affected by temperature changes, which facilitates leak detection operations. The first guide rod is used to guide the direction when sliding on the rectangular connecting frame, so as to improve the accuracy of aligning the suction gun cover box with the weld.

[0020] A push plate 16 is slidably provided in the cavity 15, and first electric telescopic rods 17 are fixedly installed on the side walls at the four corners of the cavity 15, and the telescopic end of the first electric telescopic rod 17 penetrates the outer wall of the cavity 15 and extends into its internal cavity and is fixedly connected to the push plate 16. First plug holes 18 are symmetrically provided on the side walls of the cavity 15 on the left and right sides of the suction gun cover box 13, and second plug holes 19 corresponding to the first plug holes 18 are also provided on the side walls of the push plate 16. Second connecting rods 22 are symmetrically fixed up and down with the first plug holes 18 on the side walls of the cavity 15 on the left and right sides of the suction gun cover box 13, and the top ends of the two second connecting rods 22 on each side are fixed by arc-shaped mounting plates 21, and the two arc-shaped mounting plates 21 are arranged symmetrically in a mirror-like manner. A second hydraulic cylinder 23 is fixedly installed on the arc-shaped mounting plate 21, and the telescopic end of the second hydraulic cylinder 23 penetrates the arc-shaped mounting plate 21 and fixes the first A second connecting block 24 is provided, and an arc-shaped connecting plate 25 is fixed on the side wall of the second connecting block 24. A U-shaped bracket 26 is fixed on the bottom end of the arc-shaped connecting plate 25. A circular plate 27 is fixed on the top end of the arc-shaped connecting plate 25. A second electric telescopic rod 28 is fixedly installed on the side wall of the circular plate 27. The telescopic end of the second electric telescopic rod 28 penetrates the circular plate 27 and fixes a pressure plate 29. A silicone sealing hose 30 is provided between the circular plate 27 and the U-shaped bracket 26. A plug 31 is installed at the outlet of the silicone sealing hose 30. The plug 31 is arranged opposite to the first plug hole 18. The pressure plate 29 is inserted into the tail of the silicone sealing hose 30 and fits with the piston in the silicone sealing hose 30. The silicone sealing hose is combined with the cavity, the first plug hole and the second plug hole to make the sealant accurately sealed, and the sealant is pushed away by the push plate. The operation is convenient, and it is prepared for the next leak detection operation and improves efficiency.

[0021] A further embodiment of the present invention is as follows: Fig.10 As shown, the helium inflation structure 32 includes a working platform 33, which is placed at the bottom end of the vacuum pipe 1. The bottom surface of the working platform 33 is arc-shaped corresponding to the inner arc surface of the vacuum pipe 1, and a plurality of balls are evenly inlaid on the arc-shaped bottom surface of the working platform 33. Two second guide rods 36 are fixed to the side of one end of the working platform 33, and the other ends of the two second guide rods 36 both penetrate the support plate 34, and guide cylinders 35 are slidably sleeved outside the second guide rods 36, and the guide cylinders 35 are fixed to the support plate 34. The support plate 34 is arranged outside the vacuum pipe 1, and the second base 37 is fixed to the bottom end of the support plate 34; the stability of the helium inflation structure is improved by combining the support plate with the second base.

[0022] A helium inflator 38 is fixed on the top of the working platform 33, and two second arc-shaped plates 39 are symmetrically fixed on the side wall of the working platform 33. The tops of the two second arc-shaped plates 39 are fixed by a connecting plate 40. A funnel-shaped material box 41 is fixed on the top of the connecting plate 40. A closing plug plate 42 is inserted into the material tube of the funnel-shaped material box 41. The funnel-shaped material box 41 is filled with iron powder. The inner end faces of the second arc-shaped plates 39 are both provided with arc-shaped slide grooves 44. The arc-shaped slide grooves 44 on both sides are slidably connected. The arc-shaped mounting frame 43 has two handles 46 fixed on the upper and lower inner arc surface of the arc-shaped mounting frame 43, and the two ends of the n-type plate 47 are fixed at the center of the inner arc surface of the arc-shaped mounting frame 43. The third hydraulic cylinder 48 is fixed on the side wall of the n-type plate 17 away from the arc-shaped mounting frame 43. The telescopic end of the third hydraulic cylinder 48 penetrates the n-type plate 47 and fixes the helium cover box 49. The helium cover box 49 is in a long strip shape. The side of the helium cover box 49 facing the inner arc surface of the vacuum pipe 1 is in an arc shape and is aligned with the inner arc surface of the vacuum pipe 1. The arc surface fits tightly, and a sealing strip is provided on the side of the helium cover box 49 facing the inner arc surface of the vacuum pipeline 1. The second connecting pipe 5 is fixedly connected to the side wall of the helium cover box 49 away from the vacuum pipeline 1. One end of the second connecting pipe 50 is connected to the internal cavity of the helium cover box 49, and the other end of the second connecting pipe 50 is connected to the inflation port of the helium inflator 38 through the inflation pipe 51. The first hydraulic cylinder 9, the second hydraulic cylinder 23, and the third hydraulic cylinder 48 are respectively connected to the external hydraulic station pipeline through the conduit; the helium mass spectrometer leak detector 4, the first electric telescopic rod 17, the second electric telescopic rod 28, the helium inflator 38 and the reduction motor 59 are respectively electrically connected to the external power supply through the wire; the iron powder in the funnel-shaped unloading box is controlled by closing the plug plate, and it can be stopped and used at any time, which is simple and efficient; the iron powder is combined with the magnet block to accurately determine the specific position of the suction gun cover box outside the vacuum pipeline, so as to prevent the helium cover box in the vacuum pipeline from being misaligned with the suction gun cover box outside the vacuum pipeline, thereby improving the accuracy of the leak detection operation.

[0023] Working principle: When leak detection is performed on the weld of the vacuum pipe 1, Figure 1-Figure 2 , Figure 11-Figure 12 As shown, the vacuum pipe 1 is placed on two rolling structures 52 , and during the weld leak detection process using the helium mass spectrometer leak detector 4 , the worker only needs to perform the leak detection operation at a fixed point on one side of the vacuum pipe 1 .

[0024] The working platform 33 is placed in the vacuum pipe 1, and the helium cover box 49 is arranged opposite to the weld. The helium mass spectrometer leak detection structure 2 is placed outside the vacuum pipe 1, so that the first arc plate 6 is close to the outer wall of the vacuum pipe 1, and the suction gun cover box 13 is arranged opposite to the weld. The telescopic end of the first hydraulic cylinder 9 is controlled to extend, so that the suction gun cover box 13 is close to the outer wall of the vacuum pipe 1, and the telescopic end of the second hydraulic cylinder 23 is controlled to extend to insert the end of the nozzle 31 into the cavity 15 through the first plug hole 18, and at the same time pass through the second plug hole 19 on the push plate 16. At this time, the telescopic end of the second electric telescopic rod 28 is controlled to extend slowly, and the pressure plate 29 is used to push the piston in the silicone sealing hose 30, and the sealant in the silicone sealing hose 30 is squeezed into the cavity 15 through the plug nozzle 31. The sealant solidifies and forms to seal the contact between the suction gun cover box 13 and the vacuum pipe 1. At this time, the closing plug plate 42 is pulled to release the iron powder in the funnel-shaped discharge box 41. The iron powder It slides along the inner arc surface of the vacuum pipe 1. When the iron powder passes the corresponding position of the suction gun cover box 13, the four magnet blocks 60 adsorb and fix a part of the iron powder on the inner wall of the vacuum pipe 1. The specific position of the suction gun cover box 13 outside the vacuum pipe 1 is determined by observing the position of the iron powder adsorbed on the inner wall of the vacuum pipe 1. The arc-shaped mounting frame 43 is slid by the handle 46 to align the helium cover box 49 between the iron powder adsorbed on the inner wall of the vacuum pipe 1. The helium cover box 49 in the vacuum pipe 1 and the suction gun cover box 13 outside the vacuum pipe 1 cooperate with each other. The telescopic end of the third hydraulic cylinder 48 is controlled to extend so that the helium cover box 49 is tightly fitted with the inner wall of the vacuum pipe 1. The helium mass spectrometer leak detector 4 is started. The inside of the suction gun cover box 13 is first evacuated through the suction pipe 20. After waiting for a period of time, the helium inflator 38 is started to fill helium into the helium cover box 49 through the inflation pipe 51. The helium mass spectrometer leak detector 4 performs helium detection on the suction gun cover box 13.

[0025] After the detection is completed, the telescopic end of the third hydraulic cylinder 48 is controlled to retract, so that the helium cover box 49 is separated from the inner wall of the vacuum pipe 1, the telescopic end of the first hydraulic cylinder 9 is controlled to retract, so that the suction gun cover box 13 is separated from the outer wall of the vacuum pipe 1, and the telescopic end of the first electric telescopic rod 17 is controlled to extend to push the sealant in the cavity 15 out through the push plate 16 to prepare for the next leak detection operation. When changing the weld leak detection position, the roller 56 drives the vacuum pipe 1 to roll slowly when the reduction motor 59 is started.

[0026] The above only describes the preferred embodiments of the present invention. The protection scope of the present invention is not limited by the above embodiments. Simple replacements made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A weld detection device for a magnetic levitation transportation low vacuum pipeline, characterized in that: The invention comprises a rolling structure (52), a helium mass spectrometer leak detection structure (2) and a helium gas filling structure (32), wherein the helium mass spectrometer leak detection structure (2) is placed on the outside of a vacuum pipe (1), and the helium gas filling structure (32) is placed on the inside of the vacuum pipe (1). The helium mass spectrometer leak detection structure (2) and the helium gas filling structure (32) are used for leak detection of the vacuum pipe (1). The two rolling structures (52) are placed on the bottom end of the vacuum pipe (1), and the rolling structures (52) are used for rolling the vacuum pipe (1).

2. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 1 is characterized in that: The rolling structure (52) comprises a third base (53), and two sides of the top surface of the third base (53) are mirror-symmetrically fixed with supports (54) along the central vertical plane of the vacuum pipe (1). Each of the supports (54) is symmetrically hinged to a V-shaped frame (55) via a pin shaft, and a roller (56) is connected between the ends of the two V-shaped frames (55). The two ends of the rotating shaft of the roller (56) respectively penetrate the two V-shaped frames (55) and are rotatably connected to the contact points therewith, and one end thereof penetrates the V-shaped frame (55) and is fixed to the first gear (57), A protective cover (58) is fixed on the end surface of the V-shaped frame (55) on the side of the first gear (57), the first gear (57) is placed in the protective cover (58), a reduction motor (59) is fixedly mounted on the outer end surface of the protective cover (58), the output shaft of the reduction motor (59) penetrates the protective cover (58) to fix the second gear (45), the second gear (45) is arranged between the two first gears (57), and the second gear (45) is meshed with the first gear (57), and the two rolling structures (52) are arranged in mirror symmetry.

3. A weld detection device for a magnetic levitation transportation low vacuum pipeline according to any one of claims 1 or 2, characterized in that: The helium mass spectrometer leak detection structure (2) comprises a first base (3), a helium mass spectrometer leak detector (4) is fixed on one side of the top surface of the first base (3), a support frame (5) is symmetrically fixed along the extension line of the center line of the helium mass spectrometer leak detector (4) on the other side of the top surface of the first base (3), and a first arc plate (6) is fixed on the top of two support frames (5), and the ends of the two first arc plates (6) are fixedly connected by two first connecting rods (7), the inner circle diameter of the first arc plate (6) matches the outer circle diameter of the vacuum pipe (1), and the first arc plate (6) is fixed to the top of the two support frames (5). A plurality of balls are evenly inlaid on the inner arc surface of the plate (6); two ports of a U-shaped plate (8) are fixed on the outer arc surface of each first arc plate (6); a first hydraulic cylinder (9) is fixedly installed on the side wall of the U-shaped plate (8) away from the first arc plate (6); the telescopic ends of the two first hydraulic cylinders (9) penetrate the U-shaped plate (8) and are fixed to the same rectangular connecting frame (10); first guide rods (11) are respectively fixed on both sides of the upper and lower ends of the rectangular connecting frame (10); the other end of the first guide rod (11) penetrates the U-shaped plate (8) and is slidably connected thereto, the rectangular connecting frame (10) is fixed with a suction gun cover box (13) through a first connecting block (12) at a middle portion of one side close to the vacuum pipe (1), the suction gun cover box (13) is in a long strip shape, the suction gun cover box (13) is in an arc shape on the side facing the vacuum pipe (1) and is tightly fitted with the outer arc surface of the vacuum pipe (1), a sealing strip is provided on the side facing the vacuum pipe (1), and the suction gun cover box (13) is fixedly connected to the first connecting pipe (1) on the side wall away from the vacuum pipe (1). 14), one end of the first connecting tube (14) is connected to the internal cavity of the suction gun cover box (13), and the other end is connected to the suction port of the helium mass spectrometer leak detector (4) through the suction tube (20); a cavity (15) is fixedly sleeved around the joint between the suction gun cover box (13) and the outer wall of the vacuum pipe (1); the side of the cavity (15) facing the vacuum pipe (1) is tightly fitted with the outer arc surface of the vacuum pipe (1), and the side of the cavity (15) facing the vacuum pipe (1) is provided with a sealing strip, and magnet blocks (60) are respectively fixed at the four corners of the cavity (15).

4. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 3 is characterized in that: A push plate (16) is slidably provided in the cavity (15), and first electric telescopic rods (17) are fixedly installed on the side walls at the four corners of the cavity (15). The telescopic end of the first electric telescopic rod (17) penetrates the outer wall of the cavity (15) and extends into the internal cavity thereof to be fixedly connected to the push plate (16). First plug holes (18) are symmetrically provided on the side walls of the cavity (15) on the left and right sides of the suction gun cover box (13), and second plug holes (19) corresponding to the first plug holes (18) are also provided on the side walls of the push plate (16). Second connecting rods (22) are symmetrically fixed up and down on the side walls of the cavity (15) on the left and right sides of the suction gun cover box (13) through the first plug holes (18). The top ends of the two second connecting rods (22) on each side are fixed by arc-shaped mounting plates (21). The two arc-shaped mounting plates (21) are arranged symmetrically in a mirror-like manner. A second hydraulic cylinder (2 3), the telescopic end of the second hydraulic cylinder (23) penetrates the arc-shaped mounting plate (21) and fixes the second connecting block (24), the arc-shaped connecting plate (25) is fixed on the side wall of the second connecting block (24), the bottom end of the arc-shaped connecting plate (25) is fixed with a U-shaped bracket (26), the top end of the arc-shaped connecting plate (25) is fixed with a circular plate (27), the side wall of the circular plate (27) is fixed with a second electric telescopic rod (28), the telescopic end of the second electric telescopic rod (28) penetrates the circular plate (27) and fixes a pressure plate (29), a silicone sealing hose (30) is provided between the circular plate (27) and the U-shaped bracket (26), a nozzle (31) is installed at the outlet of the silicone sealing hose (30), the nozzle (31) is arranged opposite to the first plug hole (18), and the pressure plate (29) is inserted into the tail of the silicone sealing hose (30) and fits with the piston in the silicone sealing hose (30).

5. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 4 is characterized in that: The helium inflation structure (32) comprises a working platform (33), the working platform (33) being disposed at the bottom end of the vacuum pipe (1), the bottom surface of the working platform (33) being in an arc shape corresponding to the inner arc surface of the vacuum pipe (1), and a plurality of balls being evenly inlaid on the arc-shaped bottom surface of the working platform (33), two second guide rods (36) being fixed to the side surface of one end of the working platform (33), the other ends of the two second guide rods (36) both passing through the support plate (34), guide cylinders (35) being slidably sleeved outside the second guide rods (36), the guide cylinders (35) being fixed to the support plate (34), the support plate (34) being disposed outside the vacuum pipe (1), and a second base (37) being fixed to the bottom end of the support plate (34).

6. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 5 is characterized in that: A helium inflator (38) is fixedly placed on the top surface of the working platform (33), and two second arc-shaped plates (39) are symmetrically fixed on the side wall of the working platform (33). The top ends of the two second arc-shaped plates (39) are fixed by a connecting plate (40), and a funnel-shaped material discharge box (41) is fixed on the top surface of the connecting plate (40). A closing plug plate (42) is inserted into the material discharge pipe of the funnel-shaped material discharge box (41). The funnel-shaped material discharge box (41) is filled with iron powder. The inner end surfaces of the second arc-shaped plates (39) are provided with arc-shaped slide grooves (44), and the arc-shaped slide grooves (44) on both sides are slidably connected to an arc-shaped mounting frame (43). Two handles (46) are fixed on the upper and lower inner arc surface of the arc-shaped mounting frame (43), and two ends of an n-shaped plate (47) are fixed at the center of the inner arc surface of the arc-shaped mounting frame (43). A third hydraulic cylinder (48) is fixed on the side wall of the n-type plate (47) away from the arc-shaped mounting frame (43); the telescopic end of the third hydraulic cylinder (48) penetrates the n-type plate (47) and fixes a helium cover box (49); the helium cover box (49) is in a long strip shape; the side of the helium cover box (49) facing the inner arc surface of the vacuum pipe (1) is in an arc shape and is tightly fitted with the inner arc surface of the vacuum pipe (1); a sealing strip is provided on the side of the helium cover box (49) facing the inner arc surface of the vacuum pipe (1); a second connecting pipe (50) is fixedly connected to the side wall of the helium cover box (49) away from the vacuum pipe (1); one end of the second connecting pipe (50) is in communication with the internal cavity of the helium cover box (49); and the other end of the second connecting pipe (50) is in communication with the inflation port of the helium inflation instrument (38) through the inflation pipe (51).

7. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 6 is characterized in that: The first hydraulic cylinder (9), the second hydraulic cylinder (23), and the third hydraulic cylinder (48) are respectively connected to an external hydraulic station pipeline via a conduit.

8. The weld detection device for a magnetic levitation transportation low vacuum pipeline according to claim 7 is characterized in that: The helium mass spectrometer leak detector (4), the first electric telescopic rod (17), the second electric telescopic rod (28), the helium inflator (38) and the reduction motor (59) are electrically connected to an external power source via wires.

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