An automobile pressure pipe leakage detection device

Abstract

The present invention discloses an automobile pressure pipe leakage detection device, aiming to solve the deficiencies in the prior art that the sealing effect between the sealing plug and the pipe orifice is poor and the sealing plug needs to be replaced to adapt to the sizes of different pipe orifices. The present invention solves the above technical problems through the following technical solutions: It includes an operation table, and also includes: a detection device and a plugging device. The plugging device is arranged at both ends of the pressure pipe and is used to plug both ends of the pressure pipe; the plugging device includes a plugging cylinder, the output end of the plugging cylinder is connected with a plugging pull rod, a plugging head is arranged at the end of the plugging pull rod far away from the plugging cylinder, a fixed cylinder and an elastic cylinder are sleeved on the plugging pull rod, and the elastic cylinder is arranged between the fixed cylinder and the plugging head. By driving the plugging pull rod to move through the plugging cylinder, the plugging pull rod and the fixed cylinder cooperate to clamp the elastic cylinder, so that the elastic cylinder expands in the circumferential direction, and the elastic cylinder seals with the inner wall of the pipe orifice, making the sealing effect better.

Description

Technical Field

[0001] The present invention relates to the technical detection field of automotive parts, and more specifically, it relates to a leakage detection device for automotive pressure pipes. Background Art

[0002] Since automotive pressure pipes need to be connected to the engine, during the manufacturing process, in order to ensure their airtight performance, airtightness detection needs to be carried out on them; when detecting the pressure pipes, the airtightness of the pressure pipes is required. The current detection method is that workers manually seal both ends of the exhaust pipe with pipe plugs, and then manually introduce high-pressure air into the pipe through a pipe plug, and check whether there is air leakage to achieve airtightness detection. In this way, the detection efficiency is low, the accuracy is not high, and the labor intensity of workers is large.

[0003] Chinese Patent Publication No. CN213209414U, publication date May 14, 2021, the invention name is an airtightness detection tooling for automotive exhaust pipes. This application discloses an airtightness detection tooling for automotive exhaust pipes. In the above application, an airtightness detection mechanism is set up, enabling automatic sealing, greatly improving the detection efficiency and accuracy, and reducing the labor intensity of workers. However, the above application has the following deficiencies: (1) When sealing, only simple sealing is carried out through the sealing plug, resulting in poor sealing effect between the sealing plug and the exhaust pipe, thus affecting the test accuracy; (2) The size of the sealing plug remains unchanged, so when the size of the exhaust pipe nozzle changes, the sealing plug needs to be replaced to ensure the airtightness between the sealing plug and the inner wall of the exhaust pipe. Summary of the Invention

[0004] The present invention overcomes the following deficiencies in the prior art: (1) Poor sealing effect between the sealing plug and the nozzle; (2) The need to replace the sealing plug to adapt to the sizes of nozzles of different sizes, and provides a leakage detection device for automotive pressure pipes, which can improve the sealing effect between the sealing plug and the nozzle; and can adapt to the sizes of nozzles of different sizes at the same time.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A leakage detection device for automotive pressure pipes, including an operation table, and further including:

[0006] A detection device for performing airtightness detection on the pressure pipe;

[0007] A plugging device arranged at both ends of the pressure pipe for plugging both ends of the pressure pipe; the plugging device includes a plugging cylinder, the output end of the plugging cylinder is connected with a plugging pull rod, a plugging head is arranged at the end of the plugging pull rod far from the plugging cylinder, and a fixed cylinder and an elastic cylinder are sleeved on the plugging pull rod, and the elastic cylinder is arranged between the fixed cylinder and the plugging head.

[0008] In the present invention, by providing a plugging device, a plugging pull rod is driven to move by a plugging cylinder, so that the plugging pull rod cooperates with a fixed cylinder to clamp an elastic cylinder, causing the elastic cylinder to expand in the circumferential direction, enabling the elastic cylinder to abut against the inner side wall of the pipe orifice, and making the sealing effect between the elastic cylinder and the inner side wall better. Then, a detection device is used to detect the airtightness of the inner wall of the pressure pipe, making the detection accuracy higher. At the same time, since the elastic cylinder expands to cooperate with the inner wall of the pressure pipe, the elastic cylinder can adapt to pressure pipe orifices with different diameters within a certain range. For pressure pipe orifices with similar diameters, there is no need to replace the plugging device, enabling it to adapt to the sizes of different orifices.

[0009] Preferably, there are two plugging devices, namely a first plugging device and a second plugging device. A vent hole is provided along the length direction of the plugging pull rod of the second plugging device, and a through hole penetrating the side wall is provided on the side wall of the vent hole; the detection device includes a leak detector, and an air outlet is provided on the leak detector, and the air outlet is connected to the through hole through a trachea.

[0010] Preferably, the material of the elastic cylinder is polyurethane.

[0011] Preferably, the plugging device is connected to a pushing device. The pushing device includes a pushing cylinder, and the output end of the pushing cylinder is connected to a pushing plate; the plugging cylinder is arranged on the pushing plate.

[0012] Preferably, the operating platform is provided with a limiting bracket, which includes a first limiting bracket and a second limiting bracket. Both the first limiting bracket and the second limiting bracket are provided with limiting grooves that cooperate with the pressure pipe.

[0013] Preferably, the operating platform is provided with a pressing device, which includes a pressing cylinder, and the output end of the pressing cylinder is provided with a pressing rod.

[0014] Preferably, the operating platform is provided with an auxiliary device for assisting in clamping the pressure pipe. The auxiliary device includes an auxiliary cylinder and an auxiliary bracket. The auxiliary bracket is connected to the output end of the auxiliary cylinder, and a clamping groove that cooperates with the pressure pipe is provided on the auxiliary bracket.

[0015] Preferably, it further includes a laser marking machine for marking the pressure pipe, and the laser marking machine is connected to the output end of a horizontal cylinder.

[0016] Preferably, the plugging pull rod includes a first pull rod and a second pull rod. An installation hole is provided in the second pull rod. One end of the first pull rod is arranged in the installation hole, and the other end of the first pull rod is connected to the output end of the plugging cylinder. A through hole is arranged on the side wall of the installation hole in the radial direction. A self-locking pin is arranged in the through hole. A convex ring is arranged in the circumferential direction of the self-locking pin, and a ring groove is arranged in the circumferential direction of the through hole. The convex ring is arranged in the ring groove, and a self-locking spring is arranged in the ring groove. The self-locking spring pushes the self-locking pin to move towards the first pull rod. A first locking groove corresponding to the through hole is arranged on the side wall of the first pull rod, and a plurality of second locking grooves are arranged on the inner side wall of the fixed cylinder in its axial direction. The self-locking spring pushes the self-locking pin to abut against the first locking groove.

[0017] Preferably, the pressing device corresponds to the position of the limiting bracket, and the pressing device and the limiting bracket cooperate to limit and fix the pressure pipe.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The elastic cylinder cooperates with the inner wall of the pressure pipe to improve the test accuracy;

[0020] (2) The plugging device can adapt to the sizes of different pipe orifices, eliminating the trouble of frequently replacing the sealing plug;

[0021] (3) It can realize automatic detection, reduce the manual operation intensity, and improve the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an axonometric view of the present invention;

[0023] Figure 2 is a structural diagram above the frame of the present invention;

[0024] Figure 3 is a structural diagram of the relevant structure of the operating platform of the present invention;

[0025] Figure 4 is a structural diagram of another angle of the operating platform of the present invention;

[0026] Figure 5 is a cross-sectional view of the first plugging device of the present invention;

[0027] Figure 6 is a structural diagram and a cross-sectional view of the second plugging device of the present invention;

[0028] Figure 7 is a structural diagram and a partial enlarged view of the first plugging device in Embodiment 3 of the present invention;

[0029] Figure 8 is a structural diagram and a partial enlarged view of the second plugging device in Embodiment 3 of the present invention;

[0030] In the figure: 1. Operating table;

[0031] 2. Detection device, 21. Leak detector, 22. Air outlet;

[0032] 3. Sealing device, 31. Sealing cylinder, 32. Sealing pull rod, 321. Air guide hole, 322. Through hole, 323. Quick connector, 33. Sealing head, 34. Elastic cylinder, 35. Fixed cylinder, 351. Second locking groove, 36. First pull rod, 361. First locking groove, 37. Second pull rod, 371. Mounting hole, 372. Through hole, 373. Self-locking pin, 374. Convex ring, 375. Ring groove, 376. Self-locking spring;

[0033] 4. Pushing device, 41. Pushing cylinder, 42. Pushing plate;

[0034] 5. Limiting bracket, 51. First limiting bracket, 52. Second limiting bracket;

[0035] 6. Pressing device, 61. Pressing cylinder, 62. Pressing rod;

[0036] 7. Auxiliary device, 71. Auxiliary cylinder, 72. Auxiliary bracket, 73. Card slot;

[0037] 8. Laser marking machine, 81. Horizontal cylinder, 82. Rotating shaft

[0038] 9. Pressure pipe, 91. First sealing device, 92. Second sealing device. Detailed implementation mode

[0039] The technical solution of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings:

[0040] Embodiment 1: Refer to Figures 1 to 6 As shown, an automobile pressure pipe leak detection device includes a frame and an operating table 1 arranged inside the frame, and further includes:

[0041] A laser marking machine 8, the laser marking machine 8 is arranged above the operating table 1 and is used to mark the pressure pipe 9 by laser. A rotating shaft 82 is connected above the frame, and the lower part of the rotating shaft 81 is connected to the horizontal cylinder 81. The laser marking machine 8 is connected to the output end of the horizontal cylinder 81. By adjusting the rotation angle of the rotating shaft 81 and the moving distance of the horizontal cylinder 81, the position of the laser marking machine 81 can be adjusted;

[0042] A detection device 2, the detection device 2 is arranged above the operating table 1 and is used to detect the air tightness of the pressure pipe 9;

[0043] The plugging device 3 is arranged at both ends of the pressure pipe 9 and is used to plug both ends of the pressure pipe 9. The plugging device 3 includes a plugging cylinder 31. The output end of the plugging cylinder 31 is connected with a plugging pull rod 32. A plugging head 33 is arranged at the end of the plugging pull rod 32 far away from the plugging cylinder 31. The diameter of the plugging head 33 in the circumferential direction is larger than that of the plugging pull rod 32. A fixing cylinder 35 and an elastic cylinder 34 are sleeved on the plugging pull rod 32. One end of the fixing cylinder 35 is fixedly connected with the plugging cylinder 31. The elastic cylinder 34 is arranged between the fixing cylinder 35 and the plugging head 33. The material of the elastic cylinder 34 is an elastic material. In this embodiment, the material adopted by the elastic cylinder 34 is polyurethane foam material.

[0044] In this embodiment, there are two plugging devices 3, namely a first plugging device 91 and a second plugging device 92 respectively. The first plugging device 91 is matched with the pipe orifice at one end of the pressure pipe 9, and the second plugging device 92 is matched with the pipe orifice at the other end of the pressure pipe 9. A vent hole 321 is arranged along the length direction of the plugging pull rod 32 of the second plugging device 92. A through hole 322 penetrating through its side wall is arranged on the side wall of the vent hole 321. The detection device 2 includes a leakage detector 21. An air outlet 22 is arranged on the leakage detector 21. The air outlet 22 is connected with the through hole 322 through a trachea. Among them, in order to facilitate the connection with the trachea, a quick connector 323 is arranged at the through hole 322.

[0045] Specifically, the first plugging device 91 in this embodiment is fixedly and vertically arranged on the operation table 1. The second plugging device 92 is connected with the pushing device 4. The pushing device 4 includes a pushing cylinder 41. The output end of the pushing cylinder 41 is connected with a pushing plate 42. The plugging cylinder 31 is arranged on the pushing plate 42.

[0046] A limiting bracket 5 is further arranged on the operation table 1. The limiting bracket 5 includes a first limiting bracket 51 and a second limiting bracket 52. Both the first limiting bracket 51 and the second limiting bracket 52 are provided with limiting grooves matched with the surface structure of the pressure pipe 9. The operation table 1 is provided with a pressing device 6. There are two pressing devices 6. The two pressing devices 6 respectively correspond to the positions of the first limiting bracket 51 and the second limiting bracket 52. The pressing device 6 and the limiting bracket 5 cooperate to limit and fix the pressure pipe 9. The pressing device 6 includes a pressing cylinder 61. A pressing rod 62 is arranged at the output end of the pressing cylinder 61.

[0047] The working principle of this embodiment is as follows: First, place the pressure pipe 9 to be detected on the first limiting bracket 51 and the second limiting bracket 52. When placing the pressure pipe 9, the vertically arranged first sealing device 91 is already inside the pipe orifice at one end of the pressure pipe 9. Then, the pushing cylinder 41 drives the pushing plate 42 to move, so that the second sealing device 92 enters the pipe orifice at the other end of the pressure pipe 9. After that, the output end of the sealing cylinder 31 drives the sealing pull rod 32 to move, and the sealing pull rod 32 drives the sealing head 33 to move towards the fixed cylinder 35, so that the sealing head 33 and the fixed cylinder 35 cooperate to squeeze the elastic cylinder 34. Since the material of the elastic cylinder 34 is foamed polyurethane material, when the elastic cylinder 34 is squeezed, it will expand in its circumferential direction, so that the expanded elastic cylinder 34 abuts and seals against the inner wall of the pipe orifice of the pressure pipe 9. Through the cooperation of the first sealing device 91 and the second sealing device 92, a sealed cavity is formed inside the pressure pipe 9; At the same time, the output end of the pressing cylinder 61 drives the pressing rod 62 to move towards the pressure pipe 9, so that the pressing rod 62 abuts against the pressure pipe 9. Through the cooperation between the pressing rod 62 and the limiting bracket 5, the pressure pipe 9 can be limited; Then, the leak detector 21 ventilates the pressure pipe 9 through an air pipe to detect the air tightness inside the pressure pipe 9. The leak detector 21 belongs to the prior art and uses the change of internal air pressure to detect the air tightness of the sealed cavity; When the leak detector 21 detects that the air tightness performance of the pressure pipe 9 is unqualified, the laser marking machine 8 (belonging to the prior art) marks the pressure pipe 9 through laser; Finally, the output end of the sealing cylinder 31 drives the sealing pull rod 32 to move, so that the sealing head 33 and the elastic cylinder 34 return to their original positions, and the pressing cylinder 61 drives the pressing rod 62 to return to its original position, and the detected pressure pipe 9 is taken off, waiting for the next detection of a new pressure pipe. It should be noted that the relevant control technologies for the cylinders and other devices in this embodiment belong to the prior art and will not be elaborated here.

[0048] Embodiment 2: Refer to Figures 1 to 6 As shown in the figure, this embodiment is similar in structure to Embodiment 1. The difference is that the operating table 1 is provided with an auxiliary device 7 for assisting in clamping the pressure pipe 9. The auxiliary device 7 includes an auxiliary cylinder 71 and an auxiliary bracket 72. The auxiliary bracket 72 is connected to the output end of the auxiliary cylinder 71, and a clamping groove 73 cooperating with the pressure pipe 9 is provided on the auxiliary bracket 72.

[0049] The auxiliary cylinder 71 drives the auxiliary bracket 72 to move, so that the clamping groove 73 cooperates with the pressure pipe 9, and the pressure pipe 9 is assisted to be clamped through the cooperation of the clamping groove 73.

[0050] Embodiment 3: Refer to Figures 1 to 8As shown, the structure of this embodiment is similar to that of Embodiment 1 or Embodiment 2. The difference is that the plugging pull rod 32 is composed of a first pull rod 36 and a second pull rod 37. The plugging head 33 is arranged at the end of the second pull rod 37 away from the first pull rod 36. An installation hole 371 is arranged in the second pull rod 37. One end of the first pull rod 36 is slidably arranged in the first installation hole 371, and the other end of the first pull rod 36 is fixedly connected to the output end of the plugging cylinder 31. A through hole 372 is arranged on the side wall of the installation hole 371 in the radial direction. A self-locking pin 373 is arranged in the through hole 372. A convex ring 374 is arranged in the circumferential direction of the self-locking pin 373. A ring groove 375 is arranged in the circumferential direction of the through hole 372. The convex ring 374 is arranged in the ring groove 375. A self-locking spring 376 is arranged in the ring groove 375. The self-locking spring 376 abuts between the convex ring 374 and the end of the ring groove 375. The self-locking spring 376 pushes the self-locking pin 373 to move towards the first pull rod 36. A first locking groove 361 corresponding to the through hole 372 is arranged on the side wall of the first pull rod 36. A plurality of second locking grooves 351 are arranged on the inner side wall of the fixed cylinder 35 along its axial direction. The self-locking spring 376 pushes the self-locking pin 373 to abut against the first locking groove 361, so as to connect the first pull rod 36 and the second pull rod 37. When one end of the self-locking pin 373 abuts against the first locking groove 361, the other end of the self-locking pin 373 disengages from the second locking groove 351.

[0051] When used in Embodiment 1, it is found that when the elastic cylinder 34 is used to seal the pipe orifices of pressure pipes 9 with different diameters, due to the different diameters of the pipe orifices, and each time the plugging cylinder 31 drives the plugging pull rod 32 to compress the elastic cylinder 34, the pressure for the elastic cylinder 34 to expand is the same. This causes the pressure of the elastic cylinder 34 on the inner side wall of the pipe orifice to be relatively large when the pipe orifice diameter is small, which may cause secondary damage to the pipe orifice. When the pipe orifice diameter is large, the pressure of the elastic cylinder 34 on the inner side wall of the pipe orifice is small, and the sealing performance between the elastic cylinder 34 and the inner wall of the pipe orifice becomes poor, affecting the accuracy of the airtightness detection of the pressure pipe 9. Therefore, this embodiment is provided.

[0052] The working principle of this embodiment is as follows: when the orifice of the pressure tube 9 is blocked, the blocking cylinder 31 drives the first pull rod 36 to move, the first pull rod 36 drives the second pull rod 37 to move through the self-locking pin 373, and the second pull rod 37 drives the blocking head 33 to move, so that the blocking head 33 squeezes the elastic tube 34, and when the elastic tube 34 is squeezed, it expands in the circumferential direction, so that the elastic tube 34 abuts against the inner wall of the orifice of the pressure tube 9, and when the abutting force between the elastic tube 34 and the inner wall of the orifice of the pressure tube 9 becomes larger, the elastic tube 34 abuts against the blocking head 3 3 also becomes larger and larger. When the abutment force between the elastic tube 34 and the inner wall of the nozzle of the pressure tube 9 reaches a certain level, the force of the elastic tube 34 on the plugging head 33 also reaches a certain level, so that the first pull rod 36 cannot pull the second pull rod 37, and then the first pull rod 36 overcomes the force of the self-locking spring 376, so that the self-locking pin 373 is disengaged from the first locking groove 361, and then the first pull rod 36 slides along the mounting hole 371. At the same time, the self-locking pin 373 is subjected to the force of the side wall of the first pull rod 36, so that the self-locking pin 376 and the fixed The second locking groove 351 on the fixed cylinder 35 abuts against the second locking groove 351, and the second pull rod 37 and the fixed cylinder 35 are locked through the force of the self-locking pin 376 and the second locking groove 351, so that the extrusion force between the plugging head 33 and the fixed cylinder 35 remains unchanged, and the expansion size of the elastic cylinder 34 remains unchanged; it effectively prevents the elastic cylinder 34 from excessively expanding under the extrusion force and causing damage to the nozzle of the pressure pipe 9; after the air tightness test is completed, the plugging cylinder 31 drives the first pull rod 36 to move, and when the first locking groove 361 on the first pull rod 36 moves When it reaches the position corresponding to the through hole 372, the self-locking spring 376 pushes the self-locking pin 373 to cooperate with the first locking groove 361, and the self-locking pin 373 is separated from the second locking groove 351, so that the lock established between the second pull rod 37 and the fixed cylinder 35 through the self-locking pin 373 is released, and the first pull rod 36 and the second pull rod 37 are reconnected through the self-locking pin 373, so that the first pull rod 36 drives the second pull rod 37 to move, and the second pull rod 37 drives the blocking head 33 to move, so that the blocking head 33 is separated from the fixed cylinder 35, and the elastic cylinder 34 is restored to its original state.

[0053] Therefore, by setting the above-mentioned structure, it is possible to automatically control the pressure between the sealing head 33 and the fixed tube 35 according to the size of the inner diameter of the orifice of the pressure tube 9, so that the elastic tube 34 can automatically control the pressure on the orifice of the pressure tube 9, ensuring that the pressure of the elastic tube 34 on the inner wall of the orifice of the pressure tube 9 remains the same, so that the results obtained during the detection can be more accurate.

[0054] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. An automobile pressure pipe leakage detection device, including an operating platform, characterized in that, further Including: A detection device for performing airtightness detection on a pressure pipe; A plugging device arranged at both ends of the pressure pipe for plugging both ends of the pressure pipe; the plugging device includes a plugging cylinder, the output end of the plugging cylinder is connected with a plugging pull rod, a plugging head is arranged at the end of the plugging pull rod far away from the plugging cylinder, a fixed cylinder and an elastic cylinder are sleeved on the plugging pull rod, and the elastic cylinder is arranged between the fixed cylinder and the plugging head; The plugging pull rod includes a first pull rod and a second pull rod, and an installation hole is arranged in the second pull rod; one end of the first pull rod is arranged in the installation hole, and the other end is connected with the output end of the plugging cylinder; a through hole is arranged on the side wall of the installation hole in the radial direction, a self-locking pin and a self-locking spring are arranged in the through hole, and the self-locking spring pushes the self-locking pin to move towards the first pull rod; a first locking groove corresponding to the through hole is arranged on the side wall of the first pull rod, and a plurality of second locking grooves are arranged on the inner side wall of the fixed cylinder along its axial direction, and the self-locking spring pushes the self-locking pin to abut against the first locking groove.

2. The leak detection device for automotive pressure pipes according to claim 1, characterized in that, There are two plugging devices, namely a first plugging device and a second plugging device. An air guide hole is arranged along the length direction of the plugging pull rod of the second plugging device, and a through hole penetrating the side wall is arranged on the side wall of the air guide hole; the detection device includes a leak detector, an air outlet is arranged on the leak detector, and the air outlet is communicated with the through hole through an air pipe.

3. The automotive pressure pipe leakage detection device according to claim 1, characterized in that, The material of the elastic cylinder is polyurethane.

4. The leak detection device for automotive pressure pipes according to claim 1, characterized in that, The plugging device is connected with a pushing device, and the pushing device includes a pushing cylinder, and the output end of the pushing cylinder is connected with a pushing plate; the plugging cylinder is arranged on the pushing plate.

5. The leakage detection device for automotive pressure pipes according to claim 1, characterized in that, The operating platform is provided with a limiting bracket, and the limiting bracket includes a first limiting bracket and a second limiting bracket, and both the first limiting bracket and the second limiting bracket are provided with limiting grooves matched with the pressure pipe.

6. The automotive pressure pipe leakage detection device according to claim 5, characterized in that, The operating platform is provided with a pressing device, and the pressing device includes a pressing cylinder, and a pressing rod is arranged at the output end of the pressing cylinder.

7. The automotive pressure pipe leakage detection device according to claim 1, characterized in that, The operating platform is provided with an auxiliary device for assisting in clamping the pressure pipe. The auxiliary device includes an auxiliary cylinder and an auxiliary bracket. The auxiliary bracket is connected with the output end of the auxiliary cylinder, and a clamping groove matched with the pressure pipe is arranged on the auxiliary bracket.

8. The automobile pressure pipe leakage detection device according to claim 1, characterized in that, It also includes a laser marking machine for marking the pressure pipe, and the laser marking machine is connected with the output end of a horizontal cylinder.

9. The automobile pressure pipe leakage detection device according to any one of claims 1 to 8, characterized in that, A convex ring is arranged on the circumferential direction of the self-locking pin, a ring groove is arranged on the circumferential direction of the through hole, the convex ring is arranged in the ring groove, and the self-locking spring is arranged in the ring groove.

10. The automobile pressure pipe leakage detection device according to claim 6, characterized in that, The position of the pressing device corresponds to that of the limiting bracket, and the pressing device and the limiting bracket cooperate to limit and fix the pressure pipe.

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