A weld detection device for a low-vacuum pipeline of maglev transportation

Abstract

The present invention belongs to the technical field of weld detection, and particularly relates to a weld detection device for a low-vacuum pipeline of maglev transportation. The helium mass spectrometry leak detection structure is arranged outside the vacuum pipeline, the helium gas charging structure is arranged inside the vacuum pipeline, and the rolling structure is arranged at the bottom end of the vacuum pipeline. The rolling structure includes a third base, and fixed supports are symmetrically arranged on both sides of the top surface of the third base. V-shaped frames are symmetrically hinged left and right on each of the supports. Rollers are connected between the ends of the two V-shaped frames. The two ends of the rotating shaft of the roller penetrate through the two V-shaped frames respectively and are rotatably connected to the contact points therewith. One end penetrates through the V-shaped frame and fixes a first gear. A protective cover is fixed on the end surface of the V-shaped frame. A reduction motor is fixedly installed on the outer end surface of the protective cover. The output shaft of the reduction motor penetrates through the protective cover and fixes a second gear. The second gear meshes with the first gear. Two rolling structures are arranged symmetrically in a mirror image. This device does not need to lay leak detection tooling around the weld, which is convenient for leak detection, improves the leak detection efficiency, and improves the leak detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of weld detection, and particularly relates to a weld detection device for a low-vacuum pipeline of maglev transportation. Background Art

[0002] Maglev transportation uses a (low)-vacuum pipeline as the outer shell, so that the maglev transportation track is arranged inside the pipeline outer shell, and the maglev vehicle runs in an environment close to vacuum. Due to the near-vacuum inside the pipeline, the air resistance of the maglev vehicle during operation is greatly reduced, enabling it to run at a higher speed, thus forming a high-speed maglev rail transit.

[0003] The vacuum pipeline is composed of multiple round pipes welded together. When laying the vacuum pipeline, 3-5 round pipes are welded into one section of the pipeline, and then the sections are butt-welded and spliced for laying. After each section of the pipeline is welded, leak detection operations need to be carried out on its weld 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 a helium mass spectrometer leak detector, bellows, leak detection tooling, helium filling pipelines, etc. During leak detection, a long strip-shaped leak detection tooling is connected to the helium mass spectrometer leak detector through the bellows. The vacuum sealing clay is kneaded into a long strip and applied to the edge of the groove of the leak detection tooling, and then pressed on the weld to be inspected. The vacuum pump of the helium mass spectrometer leak detector is turned on to evacuate the air, and helium gas is slowly blown along the weld on the other side, and the reading of the leak detector is recorded. The advantages of this method are high accuracy, but the disadvantages are as follows:

[0004] (1) In a low-temperature environment, the vacuum sealing clay becomes harder and is not easy to deform; when the temperature is relatively high, the sealing clay becomes soft and has been sucked back into the tooling by negative pressure during the vacuum pumping process. This method is greatly affected by temperature and is inconvenient for leak detection;

[0005] (2) For each weld to be inspected, it is necessary to re-lay the vacuum sealing clay and evacuate the air, and the steps are cumbersome;

[0006] (3) There are many welds in the vacuum pipeline and the line is long. It is difficult to lay the leak detection tooling, and the existing technical means consume a large amount of helium while having a low leak detection efficiency and cannot meet the requirements of the leak detection progress;

[0007] (4) During the leak detection process, due to the obstruction of the vacuum pipeline wall, it is impossible to accurately position when laying the leak detection tooling, and there is a situation where the leak detection tooling inside and outside the vacuum pipeline is misaligned with each other. The helium gas slowly blown along the weld cannot be detected by the helium mass spectrometer leak detector, affecting the detection accuracy. Summary of the Invention

[0008] The purpose of the present invention is to provide a weld detection device for a low-vacuum pipeline of maglev transportation, which solves the problems that the leak detection tooling in the prior art 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.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A weld detection device for a low-vacuum pipeline of maglev transportation, comprising a rolling structure, a helium mass spectrometry leak detection structure and a helium gas filling structure. The helium mass spectrometry leak detection structure is placed outside the vacuum pipeline, and the helium gas filling structure is placed inside the vacuum pipeline. The helium mass spectrometry leak detection structure and the helium gas filling structure are used for the leak detection operation of the vacuum pipeline. Two of the rolling structures are placed at the bottom end of the vacuum pipeline, and the rolling structure is used for the rolling of the vacuum pipeline.

[0011] Preferably, the rolling structure includes a third base, fixed supports are symmetrically fixed on both sides of the top surface of the third base along the central vertical plane of the vacuum pipeline. On each of the supports, V-shaped frames are symmetrically hinged left and right through pin shafts. Rollers are connected between the ends of the two V-shaped frames. The two ends of the rotating shaft of the roller penetrate through the two V-shaped frames and are rotatably connected to the contact points. One end penetrates through the V-shaped frame and fixes a first gear. A protective cover is fixed on the end face of the V-shaped frame on the side where the first gear is fixed. The first gear is placed inside the protective cover. A reduction motor is fixedly installed on the outer end face of the protective cover. The output shaft of the reduction motor penetrates through the protective cover and fixes a second gear. The second gear is arranged between the two first gears and meshes with the first gear. The two rolling structures are symmetrically arranged in mirror image.

[0012] Preferably, the helium mass spectrometry leak detection structure includes a first base. A helium mass spectrometry leak detector is fixedly installed on one side of the top surface of the first base. On the other side of the top surface of the first base, supports are symmetrically fixedly installed along the extension line of the center line of the helium mass spectrometry leak detector. The top ends of the two supports are respectively fixedly provided with first arc-shaped plates. The two ends of the two first arc-shaped plates are fixedly connected by two first connecting rods. The inner diameter of the inner circle of the first arc-shaped plate matches the outer diameter of the vacuum pipeline. A number of balls are evenly embedded on the inner arc surface of the first arc-shaped plate. The two ports of a U-shaped plate are fixedly installed on the outer arc surface of each first arc-shaped plate. First hydraulic cylinders are fixedly installed on the side walls of the U-shaped plate away from the first arc-shaped plate. The telescopic ends of the two first hydraulic cylinders penetrate through the U-shaped plate and are fixedly connected to the same rectangular connecting frame. The upper and lower ends of the two sides of the rectangular connecting frame are respectively fixedly provided with first guide rods. The other ends of the first guide rods penetrate through the U-shaped plate and are slidably connected thereto. A suction gun cover box is fixedly connected to the middle of the side of the rectangular connecting frame close to the vacuum pipeline. The suction gun cover box is in a strip shape. The side of the suction gun cover box facing the vacuum pipeline is arc-shaped and is in close fit with the outer arc surface of the vacuum pipeline. A sealing strip is provided on the side of the suction gun cover box facing the vacuum pipeline. A first connecting pipe is fixedly connected to the side wall of the suction gun cover box away from the vacuum pipeline. One end of the first connecting pipe is communicated with the inner cavity of the suction gun cover box, and the other end is communicated with the suction port of the helium mass spectrometry leak detector through a suction pipe. A cavity is fixedly sleeved around the joint between the suction gun cover box and the outer wall of the vacuum pipeline. The side of the cavity facing the vacuum pipeline is in close fit with the outer arc surface of the vacuum pipeline, and a sealing strip is provided on the side of the cavity facing the vacuum pipeline. Magnet blocks are respectively fixedly installed at the four corners of the cavity.

[0013] Preferably, a push plate is slidably arranged in the cavity. First electric telescopic rods are respectively fixedly installed on the side walls at the four corners of the cavity. The telescopic ends of the first electric telescopic rods penetrate through the outer wall of the cavity and extend into its inner cavity to be fixedly connected with the push plate. First jacks are symmetrically opened on the side walls of the cavity on the left and right sides of the suction gun cover box, and second jacks corresponding to the first jacks are also opened on the side wall of the push plate. Second connecting rods are symmetrically and vertically fixed on the side walls of the cavity on the left and right sides of the suction gun cover box with the first jacks as the symmetry axes. The top ends of the two second connecting rods on each side are fixedly installed through arc-shaped mounting plates. The two arc-shaped mounting plates are arranged in a mirror symmetry. A second hydraulic cylinder is fixedly installed on the arc-shaped mounting plate. The telescopic end of the second hydraulic cylinder penetrates through the arc-shaped mounting plate and is fixedly connected with a second connecting block. An arc-shaped connecting plate is fixedly installed on the side wall of the second connecting block. A U-shaped bracket is fixedly installed at the bottom end of the arc-shaped connecting plate. A circular plate is fixedly installed at 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 through the circular plate and is fixedly connected with a pressing disc. A silicone sealant tube is arranged between the circular plate and the U-shaped bracket. An insertion nozzle is installed at the outlet of the silicone sealant tube. The insertion nozzle is arranged opposite to the first jack. The pressing disc is inserted into the tail of the silicone sealant tube and is in contact with the piston in the silicone sealant tube.

[0014] Preferably, the helium gas filling structure includes a working platform placed at the bottom end inside the vacuum pipeline. The bottom surface of the working platform corresponds to the inner arc surface of the vacuum pipeline and is arc-shaped. A plurality of balls are evenly embedded in the arc-shaped bottom surface of the working platform. Two second guide rods are fixed to one side surface of the working platform. The other ends of the two second guide rods penetrate through the support plate. Guide cylinders are slidably sleeved outside the second guide rods, and the guide cylinders are fixed to the support plate. The support plate is arranged outside the vacuum pipeline, and a second base is fixed to the bottom end of the support plate.

[0015] Preferably, a helium gas filling instrument 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. A connecting plate is fixed between the tops of the two second arc-shaped plates. A funnel-shaped blanking box is fixed on the top surface of the connecting plate. A closing plug is inserted at the blanking pipe of the funnel-shaped blanking box. Iron powder is contained in the funnel-shaped blanking box. Arc-shaped sliding grooves are respectively opened on the inner end surfaces of the two second arc-shaped plates. An arc-shaped mounting frame is slidably connected in the two arc-shaped sliding grooves. Two handles are fixedly arranged at the upper and lower parts of the inner arc surface of the arc-shaped mounting frame. Two ends of an n-shaped plate are fixedly arranged 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-shaped plate away from the arc-shaped mounting frame. The telescopic end of the third hydraulic cylinder penetrates through the n-shaped plate and is fixed to a helium gas cover box. The helium gas cover box is strip-shaped. The side of the helium gas cover box facing the inner arc surface of the vacuum pipeline is arc-shaped and is in close fit with the inner arc surface of the vacuum pipeline. A sealing strip is arranged on the side of the helium gas cover box facing the inner arc surface of the vacuum pipeline. A second connecting pipe is fixedly connected to the side wall of the helium gas cover box away from the vacuum pipeline. One end of the second connecting pipe is communicated with the inner cavity of the helium gas cover box, and the other end of the second connecting pipe is communicated with the air inlet of the helium gas filling instrument through an air filling pipe.

[0016] Preferably, the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder are respectively connected to an external hydraulic station through pipelines.

[0017] Preferably, the helium mass spectrometer leak detector, the first electric telescopic rod, the second electric telescopic rod, the helium gas filling instrument, and the reduction motor are respectively electrically connected to an external power supply through wires.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0019] (1) Through the setting of the rolling structure, the vacuum pipeline is driven to roll slowly. During the weld leak detection process by the helium mass spectrometer leak detector, the staff only needs to perform fixed-point leak detection on one side of the vacuum pipeline. When changing the weld leak detection position, the vacuum pipeline is rolled through the rolling structure, and the staff does not need to lay leak detection tools around the weld. The laying is easier, the steps of laying leak detection tools are simplified, leak detection is convenient, and the leak detection efficiency is improved.

[0020] (2) Through the setting of the peripheral cavity of the suction gun cover box, the sealant in the silicone sealant tube is squeezed into the cavity through the insertion nozzle. The periphery of the contact between the suction gun cover box and the vacuum pipeline is sealed by the sealant in the cavity. When the sealant solidifies and forms to seal the contact between the suction gun cover boxes, the vacuum is sucked in the suction gun cover box, which improves its sealing effect and indirectly improves the accuracy of weld leak detection. Using sealant to seal is not affected by temperature and is convenient for leak detection.

[0021] (3) Through the setting of the magnet blocks at the four corners of the cavity, the iron powder scattered from the funnel-shaped blanking box is adsorbed and fixed on the inner wall of the vacuum pipeline by the four magnet blocks. The specific position of the suction gun cover box outside the vacuum pipeline is determined by observing the positions of the four adsorbed iron powders on the inner wall of the vacuum pipeline. The helium cover box inside the vacuum pipeline and the suction gun cover box outside the vacuum pipeline are relatively matched to avoid misalignment between the helium cover box and the suction gun cover box inside and outside the vacuum pipeline. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic diagram of the overall structure of the present invention from another angle;

[0024] Figure 3 is a three-dimensional view of the rolling structure in the present invention;

[0025] Figure 4 is a cross-sectional view of the protective cover in the present invention;

[0026] Figure 5 is a three-dimensional view of the helium mass spectrometry leak detection structure in the present invention;

[0027] Figure 6 is a cross-sectional view of the helium mass spectrometry leak detection structure in the present invention;

[0028] Figure 7 In the present invention Figure 6 is a partial enlarged view of A;

[0029] Figure 8 is a partial structural schematic diagram of the helium mass spectrometry leak detection structure in the present invention;

[0030] Figure 9 is a cross-sectional view of a partial structure of the helium mass spectrometry leak detection structure in the present invention;

[0031] Figure 10 is a three-dimensional view of the helium gas charging structure in the present invention;

[0032] Figure 11 is a cross-sectional view of the positional relationship between the helium gas charging structure and the rolling structure in the present invention;

[0033] Figure 12 is a cross-sectional view of the overall structure of the present invention.

[0034] Description of reference numerals: 1, vacuum pipeline; 2, helium mass spectrometry 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 jack; 19, second jack; 20, suction pipe; 21, arc mounting plate; 22, second connecting rod; 23, second hydraulic cylinder; 24, second connecting block; 25, arc connecting plate; 26, U-shaped bracket; 27, circular plate; 28, second electric telescopic rod; 29, pressing disc; 30, silicone sealant tube; 31, insertion nozzle; 32, helium gas charging structure; 33, working platform; 34, support plate; 35, guide cylinder; 36, second guide rod; 37, second base; 38, helium gas charger; 39, second arc plate; 40, connecting plate; 41, funnel-shaped blanking box; 42, closing plug plate; 43, arc mounting frame; 44, arc chute; 45, second gear; 46, handle; 47, n-shaped plate; 48, third hydraulic cylinder; 49, helium gas cover box; 50, second connecting pipe; 51, gas charging pipe; 52, rolling structure; 53, third base; 54, support; 55, V-shaped frame; 56, roller; 57, first gear; 58, protective cover; 59, reduction motor; 60, magnet block. Detailed implementation manners

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] As Figure 1-2 shown, a weld detection device for a low-vacuum pipeline of maglev transportation includes a rolling structure 52, a helium mass spectrometry leak detection structure 2, and a helium gas charging structure 32. The helium mass spectrometry leak detection structure 2 is placed outside the vacuum pipeline 1, the helium gas charging structure 32 is placed inside the vacuum pipeline 1, and two rolling structures 52 are placed at the bottom end of the vacuum pipeline 1; the helium mass spectrometry leak detection structure is combined with the helium gas charging structure for weld leak detection to improve the leak detection accuracy; when changing the weld leak detection position, the vacuum pipeline rolls through the rolling structure, avoiding workers from laying leak detection tools around the weld, simplifying the steps of laying leak detection tools, facilitating leak detection, and improving the leak detection efficiency.

[0037] A further implementation manner of the present invention is that, as Figure 3-4As shown in the figure, the rolling structure 52 includes a third base 53. On both sides of the top surface of the third base 53, fixing supports 54 are symmetrically fixed along the central vertical plane of the vacuum pipeline 1. On each support 54, V-shaped frames 55 are symmetrically hinged left and right through a pin shaft. 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 penetrate through the two V-shaped frames 55 respectively and are rotatably connected to the contact points therewith. One end penetrates through the V-shaped frame 55 and fixes a first gear 57. A protective cover 58 is fixed on the end face of the V-shaped frame 55 on the side where the first gear 57 is fixed. The first gear 57 is placed inside the protective cover 58. A reduction motor 59 is fixedly installed on the outer end face of the protective cover 58. The output shaft of the reduction motor 59 penetrates through the protective cover 58 and fixes a second gear 45. The second gear 45 is arranged between the two first gears 57, and the second gear 45 meshes with the first gear 57. Two rolling structures 52 are symmetrically arranged in a mirror image; gear transmission is carried out through the combination of the first gear and the second gear to improve the transmission accuracy.

[0038] A further embodiment of the present invention is as Figure 5-9 shown. The helium mass spectrometry leak detection structure 2 includes a first base 3. On one side of the top surface of the first base 3, a helium mass spectrometer 4 is fixedly installed. On the other side of the top surface of the first base 3, support frames 5 are symmetrically fixed along the extension line of the center line of the helium mass spectrometer 4. At the top ends of the two support frames 5, first arc-shaped plates 6 are respectively fixed. Between the ends of the two first arc-shaped plates 6, they are fixedly connected through two first connecting rods 7. The inner diameter of the inner circle of the first arc-shaped plate 6 matches the outer diameter of the vacuum pipeline 1, and a number of balls are evenly embedded on the inner arc surface of the first arc-shaped plate 6. On the outer arc surface of each first arc-shaped plate 6, two ports of a U-shaped plate 8 are fixedly installed. On the side wall of the U-shaped plate 8 away from the first arc-shaped plate 6, first hydraulic cylinders 9 are fixedly installed. The telescopic ends of the two first hydraulic cylinders 9 penetrate through the U-shaped plate 8 and fix the same rectangular connection frame 10. On both sides of the upper and lower ends of the rectangular connection frame 10, first guide rods 11 are respectively fixed. The other ends of the first guide rods 11 penetrate through the U-shaped plate 8 and are slidably connected thereto. In the middle of the side of the rectangular connection frame 10 close to the vacuum pipeline 1, a suction gun cover box 13 is fixed through a first connection block 12. The suction gun cover box 13 is in a long strip shape, and the side of the suction gun cover box 13 facing the vacuum pipeline 1 is arc-shaped and is in close contact with the outer arc surface of the vacuum pipeline 1. A sealing rubber strip is provided on the side of the suction gun cover box 13 facing the vacuum pipeline 1. A first connection pipe 14 is fixedly connected to the side wall of the suction gun cover box

[0039] A push plate 16 is slidably arranged in the cavity 15. At the four corners of the side wall of the cavity 15, first electric telescopic rods 17 are respectively and fixedly installed. The telescopic ends of the first electric telescopic rods 17 penetrate through the outer wall of the cavity 15 and extend into its internal cavity to be fixedly connected with the push plate 16. First jacks 18 are symmetrically opened on the side walls of the cavity 15 on the left and right sides of the suction gun cover box 13. And second jacks 19 corresponding to the first jacks 18 are also opened on the side wall of the push plate 16. Second connecting rods 22 are symmetrically and vertically fixed on the side walls of the cavity 15 on the left and right sides of the suction gun cover box 13 with the first jacks 18 as the symmetry axes. The tops of the two second connecting rods 22 on each side are fixedly connected through an arc-shaped mounting plate 21. The two arc-shaped mounting plates 21 are arranged in a mirror symmetry manner. A second hydraulic cylinder 23 is fixedly installed on the arc-shaped mounting plate 21. The telescopic end of the second hydraulic cylinder 23 penetrates through the arc-shaped mounting plate 21 and is fixed with a second connecting block 24. 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 at the bottom end of the arc-shaped connecting plate 25. A circular plate 27 is fixed at 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 through the circular plate 27 and is fixed with a pressing disc 29. A silicone sealant tube 30 is arranged between the circular plate 27 and the U-shaped bracket 26. An insertion nozzle 31 is installed at the outlet of the silicone sealant tube 30. The insertion nozzle 31 is arranged opposite to the first jack 18. The pressing disc 29 is inserted into the tail part of the silicone sealant tube 30 and is in contact with the piston in the silicone sealant tube 30. Through the combination of the cavity, the first jack and the second jack and the silicone sealant tube, the sealant is accurately sealed, and the push plate is used to push open the sealant, which is convenient to operate, prepares for the next leak detection operation, and improves the efficiency.

[0040] A further embodiment of the present invention is as Figure 10 shown. The helium gas filling structure 32 includes a working platform 33. The working platform 33 is placed at the bottom end inside the vacuum pipeline 1. The bottom surface of the working platform 33 corresponds to the inner arc surface of the vacuum pipeline 1 and is arc-shaped. And a plurality of balls are evenly embedded on the arc-shaped bottom surface of the working platform 33. Two second guide rods 36 are fixed on one side surface of one end of the working platform 33. The other ends of the two second guide rods 36 both penetrate through the support plate 34. And guide cylinders 35 are slidably sleeved outside the second guide rods 36. The guide cylinders 35 are both fixed with the support plate 34. The support plate 34 is arranged outside the vacuum pipeline 1. A second base 37 is fixed at the bottom end of the support plate 34. The stability of the helium gas filling structure is improved through the combination of the support plate and the second base.

[0041] On the top surface of the working platform 33, a helium inflator 38 is fixedly placed. On the side wall of the working platform 33, two second arc-shaped plates 39 are symmetrically fixed. Between the tops of the two second arc-shaped plates 39, they are fixed by a connecting plate 40. On the top surface of the connecting plate 40, a funnel-shaped blanking box 41 is fixed. At the blanking pipe of the funnel-shaped blanking box 41, a closing plug plate 42 is inserted. The funnel-shaped blanking box 41 is filled with iron powder. On the inner end faces of the two second arc-shaped plates 39, arc-shaped sliding grooves 44 are respectively opened. The two arc-shaped sliding grooves 44 on both sides are slidably connected to an arc-shaped mounting frame 43. On the inner arc surface of the arc-shaped mounting frame 43, two handles 46 are fixedly arranged up and down. At the center of the inner arc surface of the arc-shaped mounting frame 43, the two ends of an n-shaped plate 47 are fixed. On the side wall of the n-shaped plate 17 away from the arc-shaped mounting frame 43, a third hydraulic cylinder 48 is fixed. The telescopic end of the third hydraulic cylinder 48 penetrates through the n-shaped plate 47 and fixes a helium gas cover box 49. The helium gas cover box 49 is in a strip shape. The side of the helium gas cover box 49 facing the inner arc surface of the vacuum pipe 1 is arc-shaped and is in close fit with the inner arc surface of the vacuum pipe 1. A sealing rubber strip is arranged on the side of the helium gas cover box 49 facing the inner arc surface of the vacuum pipe 1. On the side wall of the helium gas cover box 49 away from the vacuum pipe 1, a second connecting pipe 50 is fixedly connected. One end of the second connecting pipe 50 communicates with the internal cavity of the helium gas cover box 49, and the other end of the second connecting pipe 50 is communicated with the inflation port of the helium inflator 38 through an inflation pipe 51. 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 through a 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 an external power supply through a wire; the falling of the iron powder in the funnel-shaped blanking box is controlled by the closing plug plate, and it can be used and stopped at any time, which is simple and efficient; the iron powder combines with the magnet block to accurately determine the specific position of the suction gun cover box outside the vacuum pipe, preventing the helium gas cover box in the vacuum pipe from being misaligned with the suction gun cover box outside the vacuum pipe, and improving the accuracy of the leak detection operation.

[0042] Working principle: When detecting the weld of the vacuum pipe 1, as Figure 1 - Figure 2 , Figure 11 - Figure 12 shown, the vacuum pipe 1 is placed on two rolling structures 52. During the weld leak detection process of the helium mass spectrometer leak detector 4, the staff only needs to perform the leak detection operation at a fixed point on one side of the vacuum pipe 1.

[0043] Place the working platform 33 inside the vacuum pipeline 1, set the helium hood box 49 opposite to the weld seam, place the helium mass spectrometry leak detection structure 2 outside the vacuum pipeline 1, make the first arc-shaped plate 6 closely adhere to the outer wall of the vacuum pipeline 1, and at the same time set the suction gun hood box 13 opposite to the weld seam. Control the telescopic end of the first hydraulic cylinder 9 to extend, so that the suction gun hood box 13 closely adheres to the outer wall of the vacuum pipeline 1. Control the telescopic end of the second hydraulic cylinder 23 to extend, insert the end of the insertion nozzle 31 into the cavity 15 through the first jack 18, and at the same time pass through the second jack 19 on the push plate 16. At this time, control the telescopic end of the second electric telescopic rod 28 to slowly extend, use the pressure plate 29 to push the piston in the silicone sealant tube 30, and squeeze the sealant in the silicone sealant tube 30 into the cavity 15 through the insertion nozzle 31. The sealant solidifies and forms to seal the contact area between the suction gun hood box 13 and the vacuum pipeline 1. At this time, pull the closing plug plate 42 to release the iron powder in the funnel-shaped blanking box 41. The iron powder slides along the inner arc surface of the vacuum pipeline 1. When the iron powder passes through the corresponding position of the suction gun hood box 13, the four magnet blocks 60 adsorb and fix a part of the iron powder on the inner wall of the vacuum pipeline 1. Determine the specific position of the suction gun hood box 13 outside the vacuum pipeline 1 by observing the position of the adsorbed iron powder on the inner wall of the vacuum pipeline 1. Slide the arc-shaped mounting rack 43 through the handle 46 to align the helium hood box 49 between the adsorbed iron powders on the inner wall of the vacuum pipeline 1. The helium hood box 49 inside the vacuum pipeline 1 and the suction gun hood box 13 outside the vacuum pipeline 1 cooperate with each other. Control the telescopic end of the third hydraulic cylinder 48 to extend, so that the helium hood box 49 closely adheres to the inner wall of the vacuum pipeline 1. Start the helium mass spectrometry leak detector 4. First, evacuate the inside of the suction gun hood box 13 through the suction pipe 20. After waiting for a period of time, start the helium gas filling instrument 38, and fill the helium gas into the helium hood box 49 through the gas filling pipe 51. The helium mass spectrometry leak detector 4 detects the helium gas inside the suction gun hood box 13.

[0044] After the detection is completed, control the telescopic end of the third hydraulic cylinder 48 to retract, so that the helium hood box 49 is separated from the inner wall of the vacuum pipeline 1. Control the telescopic end of the first hydraulic cylinder 9 to retract, so that the suction gun hood box 13 is separated from the outer wall of the vacuum pipeline 1. Control the telescopic end of the first electric telescopic rod 17 to extend, and push out the sealant in the cavity 15 through the push plate 16 to prepare for the next leak detection operation. When changing the leak detection position of the weld seam, start the reduction motor 59, and the roller 56 drives the vacuum pipeline 1 to slowly roll.

[0045] 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 substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A weld detection device for a low-vacuum pipeline of maglev transportation, characterized in that It includes a rolling structure (52), a helium mass spectrometry leak detection structure (2) and a helium gas filling structure (32). The helium mass spectrometry leak detection structure (2) is placed outside the vacuum pipeline (1), and the helium gas filling structure (32) is placed inside the vacuum pipeline (1). The helium mass spectrometry leak detection structure (2) and the helium gas filling structure (32) are used for the leak detection operation of the vacuum pipeline (1). Two of the rolling structures (52) are placed at the bottom end of the vacuum pipeline (1), and the rolling structure (52) is used for the rolling of the vacuum pipeline (1); the rolling structure (52) includes a third base (53). On both sides of the top surface of the third base (53), fixed supports (54) are symmetrically fixed along the central vertical plane of the vacuum pipeline (1). On each of the supports (54), V-shaped frames (55) are symmetrically hinged left and right through pin shafts. Between the ends of the two V-shaped frames (55), rollers (56) are connected. The two ends of the rotating shaft of the roller (56) respectively penetrate through the two V-shaped frames (55) and are rotatably connected to the contact points. One end penetrates through the V-shaped frame (55) and fixes a first gear (57). On the end face of the V-shaped frame (55) on the side where the first gear (57) is fixed, a protective cover (58) is fixed. The first gear (57) is placed inside the protective cover (58). On the outer end face of the protective cover (58), a reduction motor (59) is fixedly installed. The output shaft of the reduction motor (59) penetrates through the protective cover (58) and fixes a second gear (45). The second gear (45) is arranged between the two first gears (57), and the second gear (45) meshes with the first gear (57). The two rolling structures (52) are symmetrically arranged in a mirror image.

2. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 1, characterized in that The helium mass spectrometry leak detection structure (2) includes a first base (3). On one side of the top surface of the first base (3), a helium mass spectrometer leak detector (4) is fixedly installed. On the other side of the top surface of the first base (3), symmetrically along the extension line of the center line of the helium mass spectrometer leak detector (4), support frames (5) are fixedly installed. At the top ends of the two support frames (5), first arc-shaped plates (6) are respectively fixedly installed. The ends between the two first arc-shaped plates (6) are fixedly connected by two first connecting rods (7). The inner diameter of the inner circle of the first arc-shaped plate (6) matches the outer diameter of the vacuum pipeline (1), and a number of balls are evenly embedded on the inner arc surface of the first arc-shaped plate (6). On the outer arc surface of each first arc-shaped plate (6), two ports of a U-shaped plate (8) are fixedly installed. On the side wall of the U-shaped plate (8) far from the first arc-shaped plate (6), first hydraulic cylinders (9) are fixedly installed. The telescopic ends of the two first hydraulic cylinders (9) penetrate through the U-shaped plate (8) and are fixedly connected to the same rectangular connection frame (10). On both sides of the upper and lower ends of the rectangular connection frame (10), first guide rods (11) are respectively fixedly installed. The other ends of the first guide rods (11) penetrate through the U-shaped plate (8) and are slidably connected to it. In the middle of the side of the rectangular connection frame (10) close to the vacuum pipeline (1), a suction gun cover box (13) is fixedly installed through a first connection block (12). The suction gun cover box (13) is in a long strip shape. The side of the suction gun cover box (13) facing the vacuum pipeline (1) is arc-shaped and is in close fit with the outer arc surface of the vacuum pipeline (1). A sealing strip is provided on the side of the suction gun cover box (13) facing the vacuum pipeline (1). On the side wall of the suction gun cover box (13) far from the vacuum pipeline (1), a first connecting pipe (14) is fixedly connected. One end of the first connecting pipe (14) is communicated with the inner cavity of the suction gun cover box (13), and the other end is communicated with the suction port of the helium mass spectrometer leak detector (4) through a suction pipe (20). Around the joint of the suction gun cover box (13) and the outer wall of the vacuum pipeline (1), a cavity (15) is fixedly sleeved. The side of the cavity (15) facing the vacuum pipeline (1) is in close fit with the outer arc surface of the vacuum pipeline (1), and a sealing strip is provided on the side of the cavity (15) facing the vacuum pipeline (1). Magnet blocks (60) are respectively fixedly installed at the four corners of the cavity (15).

3. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 2, characterized in that, A push plate (16) is slidably arranged in the cavity (15). At the four corners of the side wall of the cavity (15), first electric telescopic rods (17) are respectively and fixedly installed. The telescopic ends of the first electric telescopic rods (17) penetrate through the outer wall of the cavity (15) and extend into its internal cavity to be fixedly connected with the push plate (16). First jacks (18) are symmetrically opened on the side walls of the cavity (15) on the left and right sides of the suction gun cover box (13), and second jacks (19) corresponding to the first jacks (18) are also opened on the side wall of the push plate (16). Second connecting rods (22) are symmetrically and vertically fixed on the side walls of the cavity (15) on the left and right sides of the suction gun cover box (13) with the first jacks (18) as the symmetry axes. The tops of the two second connecting rods (22) on each side are fixed through arc-shaped mounting plates (21). The two arc-shaped mounting plates (21) are arranged in mirror symmetry. A second hydraulic cylinder (23) is fixedly installed on the arc-shaped mounting plate (21). The telescopic end of the second hydraulic cylinder (23) penetrates through the arc-shaped mounting plate (21) and is fixed with a second connecting block (24). 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 at the bottom end of the arc-shaped connecting plate (25). A circular plate (27) is fixed at 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 through the circular plate (27) and is fixed with a pressing disc (29). A silicone sealant tube (30) is arranged between the circular plate (27) and the U-shaped bracket (26). An insertion nozzle (31) is installed at the outlet of the silicone sealant tube (30). The insertion nozzle (31) is arranged opposite to the first jack (18). The pressing disc (29) is inserted into the tail part of the silicone sealant tube (30) and is in contact with the piston in the silicone sealant tube (30).

4. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 3, wherein The helium gas filling structure (32) includes a working platform (33). The working platform (33) is placed at the bottom end inside the vacuum pipeline (1). The bottom surface of the working platform (33) corresponds to the inner arc surface of the vacuum pipeline (1) and is arc-shaped. A plurality of balls are evenly embedded on the arc-shaped bottom surface of the working platform (33). Two second guide rods (36) are fixed on one side surface of the working platform (33). The other ends of the two second guide rods (36) both penetrate through the support plate (34). Guide cylinders (35) are slidably sleeved outside the second guide rods (36). The guide cylinders (35) are all fixed with the support plate (34). The support plate (34) is arranged outside the vacuum pipeline (1). A second base (37) is fixed at the bottom end of the support plate (34).

5. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 4, characterized in that, On the top surface of the working platform (33), a helium gas inflator (38) is fixedly placed. Two second arc-shaped plates (39) are symmetrically and fixedly arranged on the side wall of the working platform (33). Between the tops of the two second arc-shaped plates (39), they are fixed by a connecting plate (40). On the top surface of the connecting plate (40), a funnel-shaped blanking box (41) is fixedly arranged. A closing plug plate (42) is inserted at the blanking pipe of the funnel-shaped blanking box (41). The funnel-shaped blanking box (41) is filled with iron powder. Arc-shaped sliding grooves (44) are respectively arranged on the inner end faces of the two second arc-shaped plates (39). An arc-shaped mounting frame (43) is slidably connected in the arc-shaped sliding grooves (44) on both sides. Two grips (46) are fixedly arranged at the upper and lower parts of the inner arc surface of the arc-shaped mounting frame (43). The two ends of an n-shaped plate (47) are fixedly arranged at the center of the inner arc surface of the arc-shaped mounting frame (43). On the side wall of the n-shaped plate (47) away from the arc-shaped mounting frame (43), a third hydraulic cylinder (48) is fixedly arranged. The telescopic end of the third hydraulic cylinder (48) penetrates through the n-shaped plate (47) and is fixed to a helium gas hood box (49). The helium gas hood box (49) is in a long strip shape. The side of the helium gas hood box (49) facing the inner arc surface of the vacuum pipeline (1) is arc-shaped and is in close fit with the inner arc surface of the vacuum pipeline (1). A sealing rubber strip is arranged on the side of the helium gas hood box (49) facing the inner arc surface of the vacuum pipeline (1). A second connecting pipe (50) is fixedly connected to the side wall of the helium gas hood box (49) away from the vacuum pipeline (1). One end of the second connecting pipe (50) is communicated with the internal cavity of the helium gas hood box (49), and the other end of the second connecting pipe (50) is communicated with the inflation port of the helium gas inflator (38) through an inflation pipe (51).

6. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 5, 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 through pipelines by conduits.

7. The weld detection device for a low-vacuum pipeline of maglev transportation according to claim 6, characterized in that, The helium mass spectrometer leak detector (4), the first electric telescopic rod (17), the second electric telescopic rod (28), the helium gas inflator (38), and the reduction motor (59) are respectively electrically connected to an external power supply through wires.

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