Automobile exhaust pipe air tightness detection device

Abstract

The utility model discloses an air tightness detection device for an automobile exhaust pipe. The air tightness detection device comprises two cylindrical plugs; the clamping assembly comprises a mounting pipe, a plurality of first extrusion blocks and a plurality of second extrusion blocks are arranged on the mounting pipe, the first extrusion blocks penetrate through the mounting pipe and are in sliding connection with the mounting pipe, and the second extrusion blocks are in sliding connection with the mounting pipe in the length direction of the mounting pipe; the periphery of the mounting pipe is in threaded connection with an extrusion ring; an air pump assembly; an air pressure detection assembly; the periphery of the cylindrical plug is in threaded connection with a connecting ring, and the side, close to the exhaust pipe, of the connecting ring is coaxially connected with the mounting pipe in a rotating mode. The clamping assembly is used for clamping the pipe opening of the exhaust pipe, then the clamping assembly is connected with the cylindrical plug through the connecting ring, the cylindrical plug can plug the pipe opening of the exhaust pipe by rotating the connecting ring, the exhaust pipe clamping device is suitable for various bent exhaust pipes and high in practicability, and a special frame body does not need to be customized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile parts production equipment, concretely is a kind of automobile exhaust pipe air tightness detection device. BACKGROUND

[0002] Automobile exhaust pipe needs to detect the air tightness of exhaust pipe after production, and the conventional detection means is to use a thrust device to seal the end of the exhaust pipe with an inflation plug and a detection plug, but in actual operation, the exhaust pipe is not always straight, and when detecting the exhaust pipe with a curved arc, a special fixture is needed to clamp the exhaust pipe, otherwise the thrust device cannot apply force, but customizing a special fixture for each type of exhaust pipe requires high cost.

[0003] The prior art patent application No.CN202321845470.9 discloses an automobile exhaust pipe air tightness detection device, which comprises a main body, a control console and a conveyor belt arranged on the main body, a frame arranged above the conveyor belt, a pressing mechanism arranged above the frame, first and second connecting mechanisms arranged on the two sides of the frame, an inflation device arranged in the control console, the first connecting mechanism connected with the inflation device through an air pipe, a groove arranged on the conveyor belt, and a fixing tool placed in the groove. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a kind of automobile exhaust pipe air tightness detection device to solve at least one of the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0006] An automobile exhaust pipe air tightness detection device comprises:

[0007] Two cylindrical plugs are arranged to block the two ends of the exhaust pipe respectively, the cylindrical plug is provided with a sealing part in the shape of a circular truncated cone near one end of the exhaust pipe, and the cylindrical plug is provided with a gas hole penetrating through both ends thereof; the cylindrical plug is used to seal and block the pipe opening at both ends of the exhaust pipe, the sealing part is used to realize the sealing and blocking of the pipe opening by the cylindrical plug, the sealing part is in the shape of a circular truncated cone, so that it can be compatible with pipe openings of different sizes, and the gas hole is used to communicate with the inside of the exhaust pipe;

[0008] The clamping assembly comprises a mounting pipe, a plurality of first extrusion blocks and a plurality of second extrusion blocks are uniformly arranged on the mounting pipe in the circumferential direction, the first extrusion blocks pass through the mounting pipe and are in sliding connection with the mounting pipe in the diameter direction of the mounting pipe, the second extrusion blocks are in sliding connection with the mounting pipe in the length direction of the mounting pipe, an extrusion ring is threadedly connected to the outer periphery of the mounting pipe, the extrusion ring is located at one end of the second extrusion block away from the first extrusion block, so that the second extrusion block extrudes the corresponding first extrusion block, and the first extrusion block clamps the exhaust pipe; the clamping assembly is arranged for clamping and positioning the exhaust pipe, the mounting pipe is arranged for mounting the first extrusion blocks and the second extrusion blocks, and the first extrusion blocks, the second extrusion blocks and the extrusion ring are matched, so that the second extrusion blocks are driven to move towards the first extrusion blocks by rotating the extrusion ring, the first extrusion blocks are extruded towards the exhaust pipe in the mounting pipe, and the plurality of first extrusion blocks jointly clamp and position the exhaust pipe;

[0009] The gas pump assembly is connected with the air hole of one of the cylindrical plugs, and is used for inflating the exhaust pipe;

[0010] The air pressure detection assembly is connected with the air hole of the cylindrical plug away from the gas pump assembly, and is used for detecting the air pressure in the exhaust pipe, so that the air tightness of the exhaust pipe is judged according to the air pressure change;

[0011] The connecting ring is coaxially and rotationally connected to the mounting pipe on the side close to the exhaust pipe, the connecting ring is arranged for connecting the cylindrical plug and the mounting pipe, the connecting ring can move along the length direction of the cylindrical plug by rotating the connecting ring, the connecting ring is coaxially and rotationally connected to the mounting pipe, the connecting ring can drive the mounting pipe to move along the length direction of the cylindrical plug, the cylindrical plug and the mounting pipe can approach or move away from each other, and the exhaust pipe can be fixed in the mounting pipe, so that the cylindrical plug and the exhaust pipe can approach each other by rotating the connecting ring, and the pipe opening of the exhaust pipe is sealed by the sealing part of the cylindrical plug.

[0012] The cylindrical plug is arranged to plug the pipe openings at the two ends of the exhaust pipe, the gas pump assembly is arranged to inflate the exhaust pipe, and the air pressure detection assembly is arranged to detect the air pressure in the exhaust pipe, so that the air tightness of the exhaust pipe is detected.

[0013] The clamping assembly is arranged to clamp the pipe opening of the exhaust pipe, the clamping assembly is connected to the cylindrical plug by the connecting ring, the pipe opening of the exhaust pipe is plugged by rotating the connecting ring, the clamping assembly is suitable for various curved exhaust pipes, and has high practicability and does not need to be customized into a special frame.

[0014] The utility model discloses a cylindrical plug's sealing part is set as a circular table, and the cylindrical plug can plug the exhaust pipe with different pipe opening sizes, and the practicality is stronger.

[0015] Further, the first end of the first extrusion block outside the mounting pipe is provided with a first inclined surface, and the end close to the first extrusion block of the second extrusion block is provided with a second inclined surface matched with the first inclined surface.

[0016] Specifically, the air pump assembly comprises an air inlet hose in sealed communication with the air hole away from the exhaust pipe, and the air inlet hose is used for pressurizing the exhaust pipe.

[0017] Specifically, the air pressure detection assembly comprises a pressure sensor in sealed communication with the air hole away from the exhaust pipe, and the pressure sensor is used for detecting the air pressure in the exhaust pipe to judge the air tightness of the exhaust pipe.

[0018] Further, the cylindrical plug, the exhaust pipe and the mounting pipe are coaxially arranged, the pipe opening of the exhaust pipe is located in the corresponding mounting pipe, and the exhaust pipe and the mounting pipe are coaxially arranged, so that the exhaust pipe can be fixed in the mounting pipe more firmly, and the exhaust pipe and the cylindrical plug are coaxially arranged, so that the cylindrical plug can seal the pipe opening of the exhaust pipe.

[0019] Further, the inner diameter of the mounting pipe is greater than the outer diameter of the cylindrical plug, the cylindrical plug can extend into the mounting pipe, the mounting pipe and the cylindrical plug are overlapped, and the occupied space of the device can be reduced.

[0020] Further, the outer periphery of the extrusion ring and the connecting ring is provided with a force applying rod, so that the extrusion ring and the connecting ring can be rotated.

[0021] Further, the connecting ring is rotationally connected with the mounting pipe through a plurality of connecting rods, one end of the connecting rod is fixed with the mounting pipe, the other end is fixed with a first sliding block, the connecting ring is provided with a first annular sliding groove coaxial with the connecting ring near the end face of the mounting pipe, the first sliding block is located in the first annular sliding groove and matched with the first annular sliding groove, the first sliding block can slide in the first annular sliding groove, the sliding cooperation between the first annular sliding groove and the first sliding block is arranged to realize the rotational connection between the connecting ring and the mounting pipe, since the connecting ring is threadedly connected with the cylindrical plug, when the connecting ring is rotated, the connecting ring can move left and right along the length direction of the cylindrical plug, the connecting ring can move left and right with the mounting pipe or rotate without the mounting pipe, the left and right movement of the mounting pipe can drive the exhaust pipe to move left and right, and the cylindrical plug can be plugged into the pipe opening of the exhaust pipe, and the sealing connection between the pipe opening of the exhaust pipe and the cylindrical plug is realized.

[0022] Further, the second extrusion block is fixed with a second sliding block near one end of the extrusion ring, the extrusion ring is provided with a second annular sliding groove coaxial with the extrusion ring near the end face of the second extrusion block, the second sliding block is located in the second annular sliding groove and matched with the second annular sliding groove, the second sliding block can slide in the second annular sliding groove, and the cooperation between the second sliding block and the second annular sliding groove is arranged to drive the second extrusion block to move left and right along the length direction of the mounting pipe when the extrusion ring is rotated, so that the exhaust pipe is clamped or loosened.

[0023] Further, the sealing part is externally provided with a rubber layer, so that the effect of plugging the pipe opening of the exhaust pipe by the cylindrical plug is improved, and the sealing property of the plugged part is improved.

[0024] Compared with the prior art, the utility model has the advantages that:

[0025] (1) The utility model discloses a clamping assembly for clamping the pipe opening of the exhaust pipe, and the clamping assembly is connected with the cylindrical plug through the connecting ring, and the cylindrical plug can plug the pipe opening of the exhaust pipe by rotating the connecting ring, so that the utility model is suitable for various curved exhaust pipes and has high practicability and does not need to customize a special frame body.

[0026] (2) The utility model discloses that the sealing part of the cylindrical plug is in the shape of a circular truncated cone, so that the cylindrical plug can plug the exhaust pipes with different pipe opening sizes, and the utility model has higher practicability. DRAWINGS

[0027] Figure 1 It is a structure schematic view of an automobile exhaust pipe air tightness detection device in the embodiment.

[0028] Figure 2 It is Figure 1 It is a local enlarged view of A in the figure.

[0029] In the figure: 1, exhaust pipe; 2, cylindrical plug; 3, sealing part; 4, air hole; 5, mounting pipe; 6, first extrusion block; 7, second extrusion block; 8, extrusion ring; 9, connecting ring; 10, second inclined surface; 11, air inlet hose; 12, pressure sensor; 13, force applying rod; 14, connecting rod; 15, first sliding block; 16, first annular sliding groove; 17, second sliding block; 18, second annular sliding groove; 19, rubber layer. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As shown in Figure 1 and Figure 2 The present embodiment provides an automobile exhaust pipe 1 air tightness detection device, comprising:

[0032] Two cylindrical plugs 2 are respectively plugged into two ends of the exhaust pipe 1, the cylindrical plug 2 is provided with a sealing part 3 in the shape of a circular truncated cone near one end of the exhaust pipe 1, and the cylindrical plug 2 is provided with an air hole 4 penetrating through both ends thereof; the cylindrical plug 2 is used to seal and plug the pipe openings at both ends of the exhaust pipe 1, the sealing part 3 is used to realize the sealing and plugging of the pipe openings of the exhaust pipe 1 by the cylindrical plug 2, the sealing part 3 is in the shape of a circular truncated cone, so that the sealing part 3 can be compatible with the pipe openings of exhaust pipes 1 of different sizes, and the air hole 4 is used to communicate with the inside of the exhaust pipe 1;

[0033] The clamping assembly comprises a mounting pipe 5, a plurality of first extrusion blocks 6 and a plurality of second extrusion blocks 7 are uniformly arranged on the circumference of the mounting pipe 5, the first extrusion blocks 6 pass through the mounting pipe 5 and are in sliding connection with the mounting pipe 5 in the diameter direction of the mounting pipe 5, in the embodiment, in order to realize the sliding connection between the first extrusion blocks 6 and the mounting pipe 5, a through hole matched with the shape of the first extrusion blocks 6 can be formed in the pipe wall of the mounting pipe 5, the first extrusion blocks 6 are installed into the through hole, the opening direction is consistent with the diameter direction of the mounting pipe 5, so that the first mounting pipe 5 can pass through the mounting pipe 5 and be in sliding connection with the mounting pipe 5; the second extrusion blocks 7 are in sliding connection with the mounting pipe 5 in the length direction of the mounting pipe 5, in order to realize the sliding connection between the second extrusion blocks 7 and the mounting pipe 5, a sliding groove can be formed in the outer wall of the mounting pipe 5, the groove direction is consistent with the length direction of the mounting pipe 5, a sliding strip is arranged on the second extrusion blocks 7, the sliding connection between the second extrusion blocks 7 and the mounting pipe 5 is realized through the cooperation of the sliding groove and the sliding strip, the extrusion ring 8 is threadedly connected to the outer circumference of the mounting pipe 5, the extrusion ring 8 is located at the end of the second extrusion blocks 7 away from the first extrusion blocks 6, so that the second extrusion blocks 7 extrude the corresponding first extrusion blocks 6, and the first extrusion blocks 6 clamp the exhaust pipe 1; the clamping assembly is arranged for clamping and positioning the exhaust pipe 1, the mounting pipe 5 is arranged for mounting the first extrusion blocks 6 and the second extrusion blocks 7, through the cooperation of the first extrusion blocks 6, the second extrusion blocks 7 and the extrusion ring 8, the second extrusion blocks 7 can be moved towards the first extrusion blocks 6 by rotating the extrusion ring 8, so as to extrude the first extrusion blocks 6 towards the exhaust pipe 1 located in the mounting pipe 5, the clamping and positioning of the exhaust pipe 1 can be realized through the cooperation of the plurality of first extrusion blocks 6;

[0034] The air pump assembly is connected with the air hole 4 of one of the cylindrical plugs 2, and is used for inflating the exhaust pipe 1;

[0035] The air pressure detection assembly is connected with the air hole 4 of the cylindrical plug 2 away from the air pump assembly, and is used for detecting the air pressure in the exhaust pipe 1, and judging the sealing performance of the exhaust pipe 1 through the change of the air pressure;

[0036] The cylindrical plug 2 is peripherally threadedly connected with a connecting ring 9, the connecting ring 9 is coaxially arranged with the cylindrical plug 2, and the side of the connecting ring 9 close to the exhaust pipe 1 is coaxially and rotatably connected with the mounting pipe 5. The connecting ring 9 is arranged for connecting the cylindrical plug 2 and the mounting pipe 5. When the connecting ring 9 is rotated, the connecting ring 9 can move along the length direction of the cylindrical plug 2. The connecting ring 9 is coaxially and rotatably connected with the mounting pipe 5. When the connecting ring 9 is rotated, the connecting ring 9 can drive the mounting pipe 5 to move along the length direction of the cylindrical plug 2. The cylindrical plug 2 and the mounting pipe 5 can be close to or away from each other. The exhaust pipe 1 can be fixed in the mounting pipe 5. Therefore, when the connecting ring 9 is rotated, the cylindrical plug 2 and the exhaust pipe 1 can be close to each other. The sealing part 3 of the cylindrical plug 2 can seal the pipe opening of the exhaust pipe 1.

[0037] The cylindrical plug 2 is arranged to block the pipe openings at both ends of the exhaust pipe 1. The air pump assembly is arranged to inflate the exhaust pipe 1. The air pressure detection assembly is arranged to detect the air pressure in the exhaust pipe 1. Therefore, the air tightness of the exhaust pipe 1 can be detected.

[0038] The clamping assembly is arranged to clamp the pipe opening of the exhaust pipe 1. The connecting ring 9 is arranged to connect the clamping assembly and the cylindrical plug 2. When the connecting ring 9 is rotated, the cylindrical plug 2 can block the pipe opening of the exhaust pipe 1. The utility model is suitable for various curved exhaust pipes 1 and has high practicability. The utility model does not need to customize a special frame body.

[0039] The sealing part 3 of the cylindrical plug 2 is arranged in a circular truncated cone shape. The cylindrical plug 2 can block the pipe openings of exhaust pipes 1 with different sizes. The utility model has higher practicability.

[0040] Further, the first end of the first extrusion block 6 outside the mounting pipe 5 is provided with a first inclined surface. The end of the second extrusion block 7 close to the first extrusion block 6 is provided with a second inclined surface 10 matched with the first inclined surface. When the second extrusion block 7 moves towards the first extrusion block 6, the first extrusion block 6 can be extruded, so that the first extrusion block 6 moves towards the mounting pipe 5. The pipe opening of the exhaust pipe 1 can be placed between the first extrusion blocks 6. The pipe opening of the exhaust pipe 1 can be clamped and positioned by the first extrusion blocks 6.

[0041] Specifically, the air pump assembly comprises an air inlet hose 11. The air inlet hose 11 is sealingly communicated with the air hole 4 away from the exhaust pipe 1. The air inlet hose 11 is arranged to pressurize the exhaust pipe 1. In the embodiment, the air inlet hose 11 can be sealingly connected with an external air source, for example, an air pump in the external environment. The air pump can press air into the exhaust pipe 1 through the air inlet hose 11 and the air hole 4, so as to pressurize the inside of the exhaust pipe 1.

[0042] Specifically, the air pressure detection assembly comprises a pressure sensor 12 in sealed communication with the air hole 4 corresponding thereto away from one end of the exhaust pipe 1, which is arranged to detect the air pressure in the exhaust pipe 1 to determine the air tightness of the exhaust pipe 1; the pressure sensor 12 cooperates with the air pump assembly, the air pump assembly pressurizes the exhaust pipe 1, when the air pressure in the exhaust pipe 1 reaches a set value, the pressurization is stopped, the communication between the air inlet hose 11 and the external air source is cut off, and the air pressure in the exhaust pipe 1 is continuously detected by the pressure sensor 12 to determine the air tightness of the exhaust pipe 1.

[0043] Further, the cylindrical plug 2, the exhaust pipe 1 and the mounting pipe 5 are coaxially arranged, the pipe opening of the exhaust pipe 1 is located in the corresponding mounting pipe 5, the exhaust pipe 1 and the mounting pipe 5 are coaxially arranged, which facilitates the fixation of the exhaust pipe 1 in the mounting pipe 5, and the exhaust pipe 1 and the cylindrical plug 2 are coaxially arranged, which facilitates the sealing plugging of the pipe opening of the exhaust pipe 1 by the cylindrical plug 2.

[0044] Further, the inner diameter of the mounting pipe 5 is greater than the outer diameter of the cylindrical plug 2, the cylindrical plug 2 can extend into the mounting pipe 5, and the mounting pipe 5 and the cylindrical plug 2 are arranged in overlap, which facilitates the reduction of the occupied space of the device.

[0045] Further, the outer periphery of the extrusion ring 8 and the connecting ring 9 is provided with a force applying rod 13, which facilitates the rotation of the extrusion ring 8 and the connecting ring 9.

[0046] Further, the connecting ring 9 is rotationally connected with the mounting pipe 5 through a plurality of connecting rods 14, the connecting rods 14 are consistent with the length direction of the mounting pipe 5, one end of the connecting rod 14 is fixed with the mounting pipe 5, and the other end is fixed with a first sliding block 15, the end surface of the connecting ring 9 close to the mounting pipe 5 is provided with a first annular sliding groove 16 coaxial with the connecting ring 9, the first sliding block 15 is located in the first annular sliding groove 16 and cooperates with the first annular sliding groove 16, the first sliding block 15 can slide in the first annular sliding groove 16, and the sliding cooperation between the first annular sliding groove 16 and the first sliding block 15 is arranged to realize the rotational connection between the connecting ring 9 and the mounting pipe 5, since the connecting ring 9 is threadedly connected with the cylindrical plug 2, when the connecting ring 9 is rotated, the connecting ring 9 can move left and right along the length direction of the cylindrical plug 2, the connecting ring 9 can move left and right with or without the mounting pipe 5, and the mounting pipe 5 can move left and right without rotating, the left and right movement of the mounting pipe 5 can drive the exhaust pipe 1 to move left and right, and the cylindrical plug 2 can be plugged into the pipe opening of the exhaust pipe 1 to realize the sealing connection between the pipe opening of the exhaust pipe 1 and the cylindrical plug 2.

[0047] Further, the second extrusion block 7 is fixed with a second sliding block 17 near one end of the extrusion ring 8, the extrusion ring 8 is provided with a second annular sliding groove 18 coaxial with the extrusion ring 8 near the end face of the second extrusion block 7, the second sliding block 17 is located in the second annular sliding groove 18 and cooperates with the second annular sliding groove 18, the second sliding block 17 can slide in the second annular sliding groove 18, through the cooperation between the second sliding block 17 and the second annular sliding groove 18, the second extrusion block 7 can be driven to move left and right along the length direction of the mounting pipe 5 when the extrusion ring 8 rotates, so that the exhaust pipe 1 can be clamped or loosened.

[0048] Further, the sealing part 3 is externally provided with a rubber layer 19, so as to improve the effect of the cylindrical plug 2 in plugging the pipe opening of the exhaust pipe 1 and improve the sealing performance of the plugged part.

[0049] It should be noted that, although the utility model is disclosed as above with specific embodiments, the above embodiments are not used to limit the utility model, and the ordinary skilled in the art can make various changes and decorations without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model is defined by the claim.

Claims

1. A device for testing the airtightness of an automotive exhaust pipe, characterized in that, The utility model relates to a kind of exhaust pipe sealing device, including: Two cylindrical plugs are sealed to the both ends of exhaust pipe respectively, the cylindrical plug is equipped with the sealing portion of circular truncated cone near one end of the exhaust pipe, the cylindrical plug is opened with air hole passing through both ends thereof; Clamping assembly includes mounting pipe, the mounting pipe is uniformly provided with a plurality of first extrusion blocks and a plurality of second extrusion blocks along its circumference, the first extrusion block is threaded through the mounting pipe, and is slidably connected with the mounting pipe in the diameter direction of the mounting pipe, the second extrusion block is slidably connected with the mounting pipe in the length direction of the mounting pipe, the mounting pipe is peripherally connected with extrusion ring, the extrusion ring is located at one end of the second extrusion block away from the first extrusion block, so that the second extrusion block extrudes its corresponding first extrusion block, and the first extrusion block clamps the exhaust pipe; Air pump assembly is connected with the air hole of one of the cylindrical plugs; Air pressure detection assembly is connected with the air hole of the cylindrical plug away from the air pump assembly; The cylindrical plug is peripherally connected with connecting ring, and the connecting ring is coaxially connected with the mounting pipe near one side of the exhaust pipe.

2. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The first extrusion block is provided with a first inclined surface at one end outside the mounting pipe, and the second extrusion block is provided with a second inclined surface at one end near the first extrusion block, which cooperates with the first inclined surface.

3. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The air pump assembly includes an air inlet hose, and the air inlet hose is in sealed communication with one end of the corresponding air hole away from the exhaust pipe.

4. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The air pressure detection assembly includes a pressure sensor, and the pressure sensor is in sealed communication with one end of the corresponding air hole away from the exhaust pipe.

5. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The cylindrical plug, the exhaust pipe and the mounting pipe are coaxially arranged, and the pipe opening of the exhaust pipe is located in the corresponding mounting pipe.

6. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The inner diameter of the mounting pipe is greater than the outer diameter of the cylindrical plug.

7. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The outer periphery of the extrusion ring and the connecting ring is provided with a force applying rod.

8. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The connecting ring is rotatably connected with the mounting pipe through a plurality of connecting rods, one end of the connecting rod is fixed with the mounting pipe, and the other end is fixed with a first sliding block, and the end surface of the connecting ring near the mounting pipe is provided with a first annular sliding groove coaxial with the connecting ring, and the first sliding block is located in the first annular sliding groove and cooperates with the first annular sliding groove.

9. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The second extrusion block is fixed with a second sliding block at one end near the extrusion ring, and the end surface of the extrusion ring near the second extrusion block is provided with a second annular sliding groove coaxial with the extrusion ring, and the second sliding block is located in the second annular sliding groove and cooperates with the second annular sliding groove.

10. The apparatus for detecting the gas tightness of an exhaust pipe of an automobile according to claim 1, wherein The sealing portion is provided with a rubber layer outside.

Images