Airtightness detection device and method for a transition joint of a construction machine

Abstract

The application relates to the technical field of air tightness detection, and discloses an air tightness detection equipment for a transition joint of engineering machinery, which comprises a detection table, a loading seat is arranged on the detection table, a sleeve is arranged on one side of the loading seat, a plug is arranged on the other side of the loading seat, and electric push rods for pushing the sleeve and the plug to translate are arranged on the two sides of the detection table. The sleeve is provided with a dismounting mechanism, the air pressure is different during detection, if the workpiece leaks, the first piston cannot push the adjusting ring to the specified position, at this time, the adjusting ring cannot reach the limiting mechanism and be clamped with the limiting mechanism, air supply is stopped after detection, the movable teeth return to the original position along with the outflow of the gas, when the sleeve returns to the original position along with the movable teeth, the side of the movable teeth with the rough plane is in contact with the sealing ring, the sealing ring can be pulled off from the workpiece under the driving of the movable teeth, and the recycling of the sealing ring can be completed.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, specifically to an airtightness testing device and method for transition joints used in engineering machinery. Background Technology

[0002] Transition joints are widely used for connecting pipes, cables, or other equipment of different materials, specifications, or types. Based on the material, transition joints can be divided into two main categories: metal joints and plastic joints. Plastic joints mainly consist of a connecting part and a separable separating part. The separating part typically includes an internally threaded retaining ring and a retaining ring with a movable opening. In use, the internally threaded retaining ring and retaining ring are first removed and placed on the pipe fitting to be connected. Then, one end of the connecting part is inserted into the pipe fitting, and the internally threaded retaining ring is screwed onto the connecting part using threads. The internally threaded retaining ring is slightly larger than the retaining ring, and has a tapered opening at its tail. Tightening the internally threaded retaining ring causes it to move towards the midpoint of the connecting part. During this process, one end of the retaining ring abuts against the connecting part, while the other end is squeezed by the internally threaded retaining ring. The movable opening on the retaining ring tightens under the push of the internally threaded retaining ring, thus sealing the pipe fitting. To improve sealing, effective products also include sealing rings and gaskets on the connecting part.

[0003] Existing transition joints typically undergo two sealing tests during inspection. The first test involves plugging both ends of the joint with plugs, then inflating and pressurizing the joint for a period to check its airtightness. The second test involves installing the sealing ring, then using two sleeves to cover both ends of the joint, followed by inflating and pressurizing again to check the airtightness of the fit between the sleeves and the sealing ring. In current technology, when defective products are found, they are generally reworked or scrapped. However, the sealing rings on the joints can still be reused. Under normal circumstances, the sealing rings can only be removed manually, which is inconvenient. Summary of the Invention

[0004] This invention provides an airtightness testing device and method for transition joints used in engineering machinery. It has the beneficial effect of conveniently removing the sealing rings of defective products, and solves the problem mentioned in the background art that when defective products are found, they are usually remelted or scrapped directly, but the sealing rings on the joints can still be reused. Under normal circumstances, the sealing rings on the joints can only be removed manually, which is quite inconvenient.

[0005] The present invention provides the following technical solution: an airtightness testing device for transition joints for engineering machinery, including a testing platform, a material carrier on the testing platform, a sleeve on one side of the material carrier and a plug on the other side of the material carrier, and electric push rods for pushing the sleeve and the plug to move horizontally on both sides of the testing platform.

[0006] The sleeve is provided with a disassembly mechanism, which includes a plurality of extension seats. One end of each extension seat is provided with a movable tooth. The movable tooth is elastically connected to the extension seat through a first spring, and the movable tooth is provided with a track groove. The sleeve is provided with an adjustment ring, which is elastically connected to the sleeve through a second spring. The adjustment ring is provided with first push rods whose number and position correspond one-to-one with the movable teeth.

[0007] A cylinder is provided on the outside of the sleeve. One end of the cylinder is connected to the inside of the sleeve, and a first piston is provided inside the cylinder. The first piston is elastically connected to the cylinder through a third spring. The adjusting ring is fixedly connected to the first piston through a first piston rod. A limiting mechanism for limiting the adjusting ring is provided on the sleeve, and a unloading mechanism is provided on the material carrier.

[0008] As an optional solution of the airtightness testing device for the transition joint of engineering machinery described in this invention, the limiting mechanism includes a bracket, one end of which is fixedly connected to the sleeve, and a limiting block is provided on the bracket. The limiting block is fixedly connected to the bracket by a first rebound spring. An extension column with a position corresponding to the limiting block is provided on one side of the adjusting ring, and a first baffle is provided on one side of the material carrier.

[0009] As an optional solution for the airtightness testing device for the transition joint of engineering machinery described in this invention, the limiting mechanism includes a clamping plate, which is elastically connected to the adjusting ring via a torsion spring, and a triangular block is provided at one end of the clamping plate. The extension seat is provided with clamping teeth, and a second baffle is provided on one side of the material carrier.

[0010] As an optional solution for the airtightness testing device of the transition joint for engineering machinery described in this invention, the extension seat is arranged in a ring at equal intervals on the outside of the sleeve, and the extension seat has an opening for the movable teeth to enter and exit.

[0011] As an optional solution for the airtightness testing device for the transition joint of engineering machinery described in this invention, the unloading mechanism includes a limiting seat disposed inside the material carrier. The limiting seat is elastically connected to the material carrier via a limiting spring, and the limiting seat is provided with two limiting blocks, one side of which is provided with an inclined surface.

[0012] As an optional solution of the airtightness testing device for the transition joint of engineering machinery described in this invention, the material carrier is provided with a first fixing ear symmetrically, the first fixing ear is elastically connected to the material carrier through a fourth spring, and the bottom of the first fixing ear is provided with an extension rod, one end of the extension rod abutting against the end of the limiting block with a bevel.

[0013] As an optional solution of the airtightness testing device for the transition joint of engineering machinery described in this invention, the material carrier is provided with a discharge port for material to fall into, and a first adjusting rod is provided at one end of the material carrier near the sleeve. The first adjusting rod is slidably connected to the material carrier, and one end of the first adjusting rod is fixedly connected to the limiting seat.

[0014] As an optional solution for the airtightness testing device of the transition joint for engineering machinery described in this invention, the unloading mechanism includes a rocker plate disposed inside the material carrier. The rocker plate is rotatably connected to the material carrier via a rotating shaft, and one end of the rocker plate is provided with a protruding rib. One end of the rocker plate abuts against a second push rod, and the other end of the rocker plate abuts against a second adjusting rod. The second push rod is slidably connected to the material carrier, and the top of the second push rod is provided with an inclined plate. The second adjusting rod is elastically connected to the material carrier via a fifth spring.

[0015] As an optional solution for the airtightness testing device for the transition joint of engineering machinery described in this invention, the material carrier is provided with a second fixing ear and a third fixing ear, both the second fixing ear and the third fixing ear are provided with slots, and a guide plate is provided on one side of the second fixing ear.

[0016] This invention discloses a testing method for an airtightness testing device for transition joints used in engineering machinery, comprising the following steps:

[0017] S1. Preparation before inspection: Clean both ends of the workpiece to ensure that there are no contaminants on the outer inspection surface of the workpiece and that the sealing ring is installed in the correct position;

[0018] S2. Place the workpiece on the material carrier, then seal both ends of the workpiece with the sleeve and the plug respectively. Next, introduce a certain amount of gas into the workpiece, then maintain the pressure for a period of time and check the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that one end of the workpiece is qualified.

[0019] S3. Change the position of the workpiece so that the end originally aligned with the plug is aligned with the sleeve. Then seal the workpiece again, then introduce a certain amount of gas into the workpiece, maintain the pressure for a period of time and check the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that the other end of the workpiece is also qualified.

[0020] The present invention has the following beneficial effects:

[0021] 1. An airtightness testing device and method for a transition joint for engineering machinery, which uses a sleeve with a disassembly mechanism to test whether the workpiece is leaking by introducing a certain amount of gas into the workpiece during testing. The disassembly mechanism includes a cylinder with a first piston. During testing, some gas enters the cylinder. Affected by the air pressure, the first piston will produce different displacements. If there is no air leakage and the air pressure is normal, the first piston can be moved to a designated position. At this time, the limiting mechanism can lock the adjusting ring with the first push rod. The first push rod can cause the movable teeth to move. When the sleeve returns to its original position, the movable teeth do not contact the sealing ring on the workpiece.

[0022] If the workpiece leaks air, the air pressure will not meet the requirements, and the first piston will not be able to push the adjusting ring to the designated position. At this time, the adjusting ring cannot reach the limit mechanism and engage with it. When the test is completed, the air supply is stopped. As the gas flows out, the movable tooth returns to its original position. When the sleeve returns to its original position with the movable tooth, the side of the movable tooth with the rough surface contacts the sealing ring. Driven by the movable tooth, the sealing ring can be peeled off the workpiece, thus completing the recycling of the sealing ring. This is efficient, time-saving, and labor-saving.

[0023] 2. The airtightness testing equipment and method for transition joints used in engineering machinery is provided by setting up a disassembly mechanism with movable teeth. The movable teeth will be in different positions according to different test results. When the test structure is qualified, the movable teeth are linked with the unloading mechanism to make the workpiece unloaded through the discharge port. When the test result is unqualified, the movable teeth are not linked with the unloading mechanism, which simply completes the distinction between qualified and unqualified workpieces, making the subsequent processing of the workpiece more convenient. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the first structure of the disassembly mechanism according to Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of the internal structure of the extension seat of the present invention.

[0027] Figure 4 This is a schematic diagram of the second structure of the disassembly mechanism according to Embodiment 1 of the present invention.

[0028] Figure 5 This is a schematic diagram of the limiting mechanism structure in Embodiment 2 of the present invention.

[0029] Figure 6 This is a schematic diagram of the first structure of the unloading mechanism in Embodiment 4 of the present invention.

[0030] Figure 7 This is a schematic diagram of the internal structure of the material carrier of the present invention.

[0031] Figure 8 This is a schematic diagram of the second structure of the unloading mechanism in Embodiment 4 of the present invention.

[0032] In the diagram: 1. Inspection table; 2. Material carrier; 201. Discharge port; 3. Sleeve; 4. Plug; 5. Electric push rod; 6. Extension seat; 601. Clamping tooth; 7. Movable tooth; 701. Track groove; 8. First spring; 9. Adjusting ring; 10. Second spring; 11. First push rod; 12. Cylinder; 13. First piston; 14. Third spring; 15. First piston rod; 16. Bracket; 17. Limiting rod; 18. First return spring; 19. First baffle. 20. Clamping plate; 21. Triangular block; 22. Second baffle; 23. Limiting seat; 24. Limiting spring; 25. Limiting block; 26. First fixing ear; 27. Fourth spring; 28. Extension rod; 29. ​​First adjusting rod; 30. Rocker; 31. Protruding rib; 32. Second top rod; 33. Second adjusting rod; 34. Inclined plate; 35. Fifth spring; 36. Second fixing ear; 37. Third fixing ear; 38. Slot; 39. Guide plate; 40. Extension column. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1, please refer to Figures 1 to 8 An airtightness testing device for transition joints used in engineering machinery includes a testing platform 1, a material carrier 2 on the testing platform 1, a sleeve 3 on one side of the material carrier 2, and a plug 4 on the other side of the material carrier 2. Electric push rods 5 for pushing the sleeve 3 and the plug 4 to move are respectively provided on both sides of the testing platform 1.

[0035] The sleeve 3 is provided with a disassembly mechanism, which includes several extension seats 6. One end of the extension seat 6 is provided with a movable tooth 7. The movable tooth 7 is elastically connected to the extension seat 6 through a first spring 8, and the movable tooth 7 is provided with a track groove 701. The sleeve 3 is provided with an adjusting ring 9. The adjusting ring 9 is elastically connected to the sleeve 3 through a second spring 10. The adjusting ring 9 is provided with a first push rod 11 whose number and position correspond one-to-one with the movable tooth 7.

[0036] A cylinder 12 is provided on the outside of the sleeve 3. One end of the cylinder 12 is connected to the inside of the sleeve 3, and a first piston 13 is provided inside the cylinder 12. The first piston 13 is elastically connected to the cylinder 12 through a third spring 14. The adjusting ring 9 is fixedly connected to the first piston 13 through a first piston rod 15. A limiting mechanism for limiting the adjusting ring 9 is provided on the sleeve 3, and a unloading mechanism is provided on the material carrier 2.

[0037] The limiting mechanism includes a bracket 16, one end of which is fixedly connected to the sleeve 3, and a limiting rod 17 is provided on the bracket 16. The limiting rod 17 is fixedly connected to the bracket 16 through a first rebound spring 18. An extension post 40 with a position corresponding to the limiting rod 17 is provided on one side of the adjusting ring 9, and a first baffle 19 is provided on one side of the material carrier 2.

[0038] The extension seat 6 is arranged in a ring at equal intervals on the outside of the sleeve 3, and the extension seat 6 has an opening for the movable teeth 7 to enter and exit.

[0039] In use, the workpiece is placed on the carrier 2. The carrier 2 has two first fixing ears 26, each with an L-shaped groove that fits the workpiece. Each side of the carrier 2 has an electric push rod 5; one pushes the plug 4, and the other pushes the sleeve 3. After the workpiece is placed, the electric push rod 5 is activated, and the plug 4 is inserted into one end of the workpiece to seal it. The sleeve 3 then moves towards the workpiece and fits over the other end. The sleeve 3, in conjunction with the rubber sealing ring at the end of the workpiece, effectively seals the workpiece. The sleeve 3 has an air inlet, and air is introduced through a pipe... An external gas supply mechanism is connected to the workpiece. A certain amount of gas is sent into the workpiece through the sleeve 3. As the gas enters, the gas pressure inside the workpiece increases. A pressure sensor is also installed inside the sleeve 3 to detect the gas pressure. As the gas pressure increases, the first piston 13 overcomes the resistance of the third spring 14 and moves. Driven by the first piston 13 and the first piston rod 15, the adjusting ring 9 moves. Driven by the adjusting ring 9, the first push rod 11 inserts into the track groove 701 of the movable tooth 7 and abuts against the inclined surface of the track groove 701. Driven by the first push rod 11, the movable tooth 7 overcomes the resistance of the first spring 8 and moves.

[0040] This technical solution uses a sleeve 3 with a disassembly mechanism. Under normal circumstances, the movable tooth 7 is located at the end of the extension seat 6 near the sleeve 3. An inclined surface is provided on the outside of the movable tooth 7. When the sleeve 3 moves towards the workpiece, the inclined surface of the movable tooth 7 abuts against the sealing ring on the workpiece. Affected by the inclined surface, the movable tooth 7 will pass over the sealing ring. If the contact surface between the sleeve 3 and the workpiece is normal, they will not leak air under a certain pressure. In this way, the first piston 13 will generate sufficient displacement under the push of air pressure to cause the adjusting ring 9 to move so that it can engage with the limiting mechanism. When the adjusting ring 9 reaches a certain position, the first push rod 11 will abut against the movable tooth 7. Under the influence of the track groove 701, the movable tooth 7 moves and moves away from the sleeve 3. At this time, when the sleeve 3 returns to its original position, the movable tooth 7 no longer contacts the sealing ring.

[0041] When the contact surface between the sleeve 3 and the workpiece is abnormal, i.e. the workpiece is unqualified, air leaks at the contact point between the sleeve 3 and the workpiece. As a result, the air pressure does not meet the requirements, and the first piston 13 cannot push the adjusting ring 9 to the designated position. At this time, the adjusting ring 9 cannot reach the limit mechanism and engage with the limit mechanism. When the test is completed, the air supply is stopped. As the gas flows out, the movable tooth 7 returns to its original position. When the sleeve 3 returns to its original position with the movable tooth 7, the side of the movable tooth 7 with the rough surface contacts the sealing ring. Driven by the movable tooth 7, the sealing ring can be peeled off the workpiece. This completes the recycling of the sealing ring, which is efficient and saves time and effort.

[0042] When the sleeve 3 moves toward the workpiece, the extension post 40 on the adjusting ring 9 abuts against the inclined surface on the limiting rod 17 and pushes the limiting rod 17 to move. At this time, the extension post 40 can pass over the limiting rod 17. Then the limiting rod 17 returns to its original position and locks the extension post 40. When the sleeve 3 returns to its original position, the end of the limiting rod 17 with the inclined surface abuts against the first baffle 19. The limiting rod 17 moves under the push of the first baffle 19. There is a notch on the limiting rod 17. When the notch is opposite to the extension post 40, the extension post 40 can pass over the limiting rod 17 through the notch. At this time, the adjusting ring 9 and the extension post 40 return to their original positions under the action of the second spring 10.

[0043] Example 2 is an explanation based on Example 1. For details, please refer to [link / reference]. Figures 1 to 8 The limiting mechanism includes a clamping plate 20, which is elastically connected to the adjusting ring 9 via a torsion spring. One end of the clamping plate 20 is provided with a triangular block 21, the extension seat 6 is provided with a clamping tooth 601, and a second baffle 22 is provided on one side of the material carrier 2.

[0044] This embodiment discloses another technical solution for the limiting mechanism, which includes a locking plate 20, which is elastically connected to an adjusting ring 9. Correspondingly, a locking tooth 601 is provided on one of the extension seats 6. When the adjusting ring 9 moves to a certain position, the locking plate 20 engages with the locking tooth 601. At this time, the adjusting ring 9 cannot return to its original position. As the sleeve 3 returns to its original position, when it reaches the position of the second baffle 22, the second baffle 22 abuts against the triangular block 21 on the locking plate 20. Under the push of the second baffle 22, one end of the locking plate 20 is lifted. At this time, the locking tooth 601 separates from the locking plate 20, and the adjusting ring 9 returns to its original position under the push of the second spring 10.

[0045] Example 3 is an explanation based on Example 1. For details, please refer to [link / reference]. Figures 1 to 8 The unloading mechanism includes a limiting seat 23 installed inside the material carrier 2. The limiting seat 23 is elastically connected to the material carrier 2 via a limiting spring 24, and two limiting blocks 25 are provided on the limiting seat 23. One side of the limiting block 25 is provided with an inclined surface.

[0046] The material carrier 2 is symmetrically provided with first fixing ears 26. The first fixing ears 26 are elastically connected to the material carrier 2 via a fourth spring 27. The bottom of the first fixing ears 26 is provided with an extension rod 28. One end of the extension rod 28 abuts against the end of the limiting block 25 with a bevel.

[0047] The material carrier 2 has a discharge port 201 for material to fall into, and a first adjusting rod 29 is provided at one end of the material carrier 2 near the sleeve 3. The first adjusting rod 29 is slidably connected to the material carrier 2, and one end of the first adjusting rod 29 is fixedly connected to the limiting seat 23.

[0048] For ease of unloading, this technical solution also includes an unloading mechanism, which includes a limiting seat 23 located inside the material carrier 2. Correspondingly, an extension rod 28 is provided at the lower end of the first fixed ear 26. Under normal circumstances, the extension rod 28 abuts against the inclined surface of the limiting block 25. When the sleeve 3 returns to its original position, if the detection is normal, the movable tooth 7 protrudes. At this time, the movable tooth 7 will abut against the first adjusting rod 29. Driven by the movable tooth 7, the first adjusting rod 29 drives the limiting seat 23 to move. As the limiting seat 23 moves, the extension rod 28 slides along the inclined surface of the limiting block 25. At this time, the two first fixed ears 26 are in an open state. As the first fixed ears 26 move, the material located between the first fixed ears 26 falls into the discharge port 201. When the movable tooth 7 returns to its original position, the movable tooth 7 separates from the first adjusting rod 29, and the limiting seat 23 returns to its original position under the action of the limiting spring 24.

[0049] If the inspection fails, when the sleeve 3 returns to its original position, the movable tooth 7 will not collide with the first adjusting rod 29. At this time, the workpiece will stay between the two first fixed ears 26. The unqualified workpiece can be removed by the robot arm. This application sets up a disassembly mechanism with movable teeth 7. The movable tooth 7 will be in different positions according to different inspection results. When the inspection structure is qualified, the movable tooth 7 is linked with the unloading mechanism to make the workpiece unloaded through the discharge port 201. When the inspection result is unqualified, the movable tooth 7 is not linked with the unloading mechanism, which simply completes the distinction between qualified and unqualified workpieces, making the subsequent processing of the workpiece more convenient.

[0050] Example 4 is an explanation based on Example 1. For details, please refer to [link / reference]. Figures 1 to 8 The unloading mechanism includes a rocker plate 30 installed inside the material carrier 2. The rocker plate 30 is rotatably connected to the material carrier 2 via a rotating shaft. One end of the rocker plate 30 is provided with a protruding rib 31. One end of the rocker plate 30 abuts against a second push rod 32, and the other end of the rocker plate 30 abuts against a second adjusting rod 33. The second push rod 32 is slidably connected to the material carrier 2, and the top of the second push rod 32 is provided with an inclined plate 34. The second adjusting rod 33 is elastically connected to the material carrier 2 via a fifth spring 35.

[0051] The material carrier 2 is provided with a second fixing ear 36 and a third fixing ear 37. Both the second fixing ear 36 and the third fixing ear 37 are provided with a slot 38, and a guide plate 39 is provided on one side of the second fixing ear 36.

[0052] This embodiment discloses another technical solution for the unloading mechanism. The second fixed ear 36 and the third fixed ear 37 are provided with slots 38 that fit the workpiece. When the product passes inspection, the adjusting ring 9 is restricted by the limiting mechanism, and the movable tooth 7 extends outwards to a large extent. When the sleeve 3 returns to its original position under the pull of the electric push rod 5, the lowermost movable tooth 7 of the sleeve 3 will abut against the second adjusting rod 33. Driven by the sleeve 3, the movable tooth 7 drags the second adjusting rod 33. The second adjusting rod 33 and the protruding rib 31 on the rocker plate 30... When the workpiece comes into contact with the workpiece, one end of the rocker 30 is raised under the push of the second adjusting rod 33. The second top rod 32 and the inclined plate 34 move upward under the push of the rocker 30. The inclined plate 34 comes into contact with the workpiece placed between the second fixed ear 36 and the third fixed ear 37. The workpiece rises under the push of the inclined plate 34. A guide plate 39 is provided on one side of the second fixed ear 36. The height of the third fixed ear 37 is higher than that of the second fixed ear 36. When the workpiece moves to a certain position, the workpiece rolls off the inclined plate 34 and then moves along the guide plate 39 to reach the designated storage area.

[0053] This invention discloses a testing method for an airtightness testing device for transition joints used in engineering machinery, comprising the following steps:

[0054] S1. Preparation before inspection: Clean both ends of the workpiece to ensure that there are no contaminants on the outer inspection surface of the workpiece and that the sealing ring is installed in the correct position;

[0055] S2. Place the workpiece on the material carrier 2, and then seal both ends of the workpiece through the sleeve 3 and the plug 4 respectively. Then, introduce a certain amount of gas into the workpiece, maintain the pressure for a period of time, and test the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that one end of the workpiece is qualified.

[0056] S3. Change the position of the workpiece so that the end originally aligned with the plug 4 is aligned with the sleeve 3. Then seal the workpiece again, then introduce a certain amount of gas into the workpiece, maintain the pressure for a period of time and check the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that the other end of the workpiece is also qualified.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An airtightness testing device for transition joints used in engineering machinery, comprising a testing platform (1), wherein a material carrier (2) is provided on the testing platform (1), characterized in that: The material carrier (2) has a sleeve (3) on one side and a plug (4) on the other side. The detection table (1) has electric push rods (5) on both sides for pushing the sleeve (3) and the plug (4) to move. The sleeve (3) is provided with a disassembly mechanism, which includes several extension seats (6). One end of each extension seat (6) is provided with a movable tooth (7). The movable tooth (7) is elastically connected to the extension seat (6) via a first spring (8). The movable tooth (7) is provided with a track groove (701). The sleeve (3) is provided with an adjusting ring (9). The adjusting ring (9) is elastically connected to the sleeve (3) via a second spring (10). The adjusting ring (9) is provided with first push rods (11) in number and position corresponding one-to-one with the movable teeth (7). A cylinder (12) is provided on the outside of the sleeve (3). One end of the cylinder (12) is connected to the inside of the sleeve (3). A first piston (13) is provided inside the cylinder (12). The first piston (13) is elastically connected to the cylinder (12) through a third spring (14). The adjusting ring (9) is fixedly connected to the first piston (13) through a first piston rod (15). A limiting mechanism for limiting the adjusting ring (9) is provided on the sleeve (3). A unloading mechanism is provided on the material carrier (2).

2. The airtightness testing device for transition joints used in engineering machinery according to claim 1, characterized in that: The limiting mechanism includes a bracket (16), one end of which is fixedly connected to the sleeve (3), and a limiting rod (17) is provided on the bracket (16). The limiting rod (17) is fixedly connected to the bracket (16) through a first rebound spring (18). An extension column (40) is provided on one side of the adjusting ring (9) with a position corresponding to the limiting rod (17). A first baffle (19) is provided on one side of the material carrier (2).

3. The airtightness testing device for transition joints used in engineering machinery according to claim 1, characterized in that: The limiting mechanism includes a clamping plate (20), which is elastically connected to the adjusting ring (9) via a torsion spring. One end of the clamping plate (20) is provided with a triangular block (21), the extension seat (6) is provided with a clamping tooth (601), and a second baffle (22) is provided on one side of the material carrier (2).

4. The airtightness testing device for transition joints used in engineering machinery according to claim 1, characterized in that: The extension seat (6) is arranged in a ring at equal intervals on the outside of the sleeve (3), and the extension seat (6) has an opening for the movable tooth (7) to enter and exit.

5. The airtightness testing device for transition joints used in engineering machinery according to claim 2, characterized in that: The unloading mechanism includes a limiting seat (23) disposed inside the material carrier (2). The limiting seat (23) is elastically connected to the material carrier (2) through a limiting spring (24), and the limiting seat (23) is provided with two limiting blocks (25), one side of which is provided with an inclined surface.

6. The airtightness testing device for transition joints in engineering machinery according to claim 5, characterized in that: The material carrier (2) is symmetrically provided with a first fixing ear (26). The first fixing ear (26) is elastically connected to the material carrier (2) through a fourth spring (27). The bottom of the first fixing ear (26) is provided with an extension rod (28). One end of the extension rod (28) abuts against the end of the limiting block (25) with a slope.

7. The airtightness testing device for transition joints in engineering machinery according to claim 6, characterized in that: The material carrier (2) is provided with a discharge port (201) for material to fall into, and a first adjusting rod (29) is provided at one end of the material carrier (2) near the sleeve (3). The first adjusting rod (29) is slidably connected to the material carrier (2), and one end of the first adjusting rod (29) is fixedly connected to the limiting seat (23).

8. The airtightness testing device for transition joints used in engineering machinery according to claim 2, characterized in that: The unloading mechanism includes a rocker plate (30) disposed inside the material carrier (2). The rocker plate (30) is rotatably connected to the material carrier (2) via a rotating shaft. One end of the rocker plate (30) is provided with a protruding rib (31). One end of the rocker plate (30) abuts against a second push rod (32), and the other end of the rocker plate (30) abuts against a second adjusting rod (33). The second push rod (32) is slidably connected to the material carrier (2), and the top of the second push rod (32) is provided with an inclined plate (34). The second adjusting rod (33) is elastically connected to the material carrier (2) via a fifth spring (35).

9. The airtightness testing device for transition joints used in engineering machinery according to claim 8, characterized in that: The material carrier (2) is provided with a second fixing ear (36) and a third fixing ear (37). Both the second fixing ear (36) and the third fixing ear (37) are provided with a slot (38), and a guide plate (39) is provided on one side of the second fixing ear (36).

10. The testing method for an airtightness testing device for transition joints used in engineering machinery according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Preparation before inspection: Clean both ends of the workpiece to ensure that there are no contaminants on the outer inspection surface of the workpiece and that the sealing ring is installed in the correct position; S2. Place the workpiece on the material carrier (2), and then seal both ends of the workpiece through the sleeve (3) and the plug (4). Then, introduce a certain amount of gas into the workpiece, maintain the pressure for a period of time, and test the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that one end of the workpiece is qualified. S3. Change the position of the workpiece so that the end originally aligned with the plug (4) is aligned with the sleeve (3). Then seal the workpiece again, then introduce a certain amount of gas into the workpiece, then maintain the pressure for a period of time and test the gas pressure inside the workpiece. If the gas pressure reaches the predetermined value, it means that the other end of the workpiece is also qualified.

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