A transmission housing air tightness detection device

Abstract

The present invention belongs to the technical field of air tightness detection, and in particular discloses a transmission housing air tightness detection device, including a shell, the shell is correspondingly buckled and placed on the top surface of a placement table, the placement table is fixedly installed on the top surface of a slide board, slides are fixed on both sides of the bottom surface of the slide board, a bottom plate is arranged at the bottom of the slide board, a top plate is fixed to the top surface of the bottom plate by using a plurality of support rods, two relatively parallel slide rails are fixed on the top surface of the bottom plate, the two slide rails correspond one-to-one to the two slide rails, and a first cylinder is arranged between the two slide rails, and the output end of the first cylinder transmits and connects to the bottom surface of the slide board. The present invention blocks the air inlet at the top of the shell by a pressure head, and the deformed sealing ring blocks the gap between the bottom surface of the bottom ring edge and the placement table, so that the shell is in a sealed state, and uses an air pressure sensor to detect the air tightness of the shell, which is convenient for rapid detection of the shell.

Description

Technical Field

[0001] The invention belongs to the technical field of air tightness detection, and in particular relates to an air tightness detection device for a transmission housing. Background Art

[0002] After the transmission case is manufactured, it is often necessary to perform an airtightness test on the transmission case to ensure that the transmission case will not leak oil during use. Currently, transmission case manufacturers have increasingly higher requirements for the airtightness of the transmission assembly. However, the existing technology only requires the airtightness of the transmission assembly and is unable to accurately determine the specific location of the sealing defects of the transmission assembly. It can only simply judge whether the transmission assembly is qualified. When the problem is discovered after the transmission has been assembled, it will cause a serious waste of manufacturing costs, and the unqualified transmission case will need to be repaired, which will increase the manufacturing costs again.

[0003] Therefore, it is necessary to invent a transmission housing airtightness detection device to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present invention provides a transmission housing airtightness detection device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The top surface of the sliding panel also has a hole, on which the air filter is installed, and the pressure sensor is connected to the bottom surface of the sliding panel, so that the air filter can be easily installed.

[0007] Furthermore, the bottom surface of the shell is provided with a bottom ring edge, the bottom surface of the bottom ring edge is provided with a ring groove, the inner side of the ring groove is clamped with a sealing ring, and the shell is fitted with the top surface of the placement table by the sealing ring passing through the bottom surface of the bottom ring edge.

[0008] Furthermore, the connecting component includes a rotating sleeve, a circularly arranged clamping edge is fixed to the bottom of the circumferential outer side surface of the vertical rod, the rotating sleeve is rotatably sleeved on the bottom end of the vertical rod using multiple clamping edges, a screw is fixed to the top surface of the pressure head, the bottom end of the rotating sleeve is spirally sleeved on the surface of the screw, and the bottom surface of the rotating sleeve is in contact with the top surface of the pressure head.

[0009] Furthermore, a buffer component is provided on the top surface of the placing table, and the buffer component includes a ring frame, which is fixed on the top surface of the placing table, a pressure plate is provided on the top of the ring frame, and the air pressure sensor is correspondingly installed on the top surface of the pressure plate, a pressure frame is fixed on the bottom surface of the pressure plate, the pressure frame passes through the center of the top surface of the ring frame, and the bottom end of the pressure frame is inside the ring frame, a plurality of inner rods are fixed on the inner side of the ring frame, the inner rods pass through the bottom surface of the pressure frame correspondingly, a spring is sleeved on the surface of the inner rod, the top end of the spring is connected to the bottom surface of the pressure frame, and the bottom end of the spring is connected to the top surface of the placing table.

[0010] Furthermore, four sliding grooves are provided on the top surface of the placing table, a slider is provided on the inner side of the sliding groove, a limiting rod is fixed on the top surface of the slider, control components for adjusting the slider are provided at the corners of the placing table, through holes are provided at the four corners of the bottom ring edge, and the bottom ring edge is buckled on the surface of the limiting rod using the corresponding through holes.

[0011] Furthermore, the control component includes a gear, and circular plates are fixed at both ends of the gear by connecting rods. Two parallel side plates are fixed at the corners of the placement table, and the gear is located between the two side plates. The connecting rod passes through the side plates. A horizontal bar is fixed to the top of the outer end of the slider, and a pull plate is fixed to the outer end of the horizontal bar. A rack is fixed to the bottom of the outer end of the slider, and the rack is meshed with the gear.

[0012] Furthermore, a ball club is fixed to the outer end of the circular plate, and sleeves are provided on the outer sides of the four sides of the placing table. The sleeves are made of rubber material, and both ends of the sleeves are sleeved with limiting frames. A ball head sleeve is provided at the outer end of the limiting frame, and the limiting frame is sleeved on the outer end of the ball club using the ball head sleeve. An insertion rod is fixed to the inner end of the limiting frame, and the insertion rod is correspondingly inserted into the end of the sleeve. Side rods that penetrate the sleeve are fixed to the sides of the placing table.

[0013] Furthermore, the gear drives the circular plate to rotate by using the connecting rod, and the rotating circular plate drives the limiting frame to rotate by using the ball rod and the ball head cover.

[0014] Technical effects and advantages of the present invention:

[0015] 1. The present invention blocks the air inlet at the top of the shell by a pressure head, and the deformed sealing ring blocks the gap between the bottom surface of the bottom ring edge and the placement table, so that the shell is in a sealed state, and the air pressure sensor is used to detect the air tightness of the shell, which is convenient for rapid detection of the shell.

[0016] 2. The present invention uses a control component to enable the slider to move inside the slide groove, and the moving slider drives the limiting rod to move synchronously. The position of the limiting rod on the inside is adjusted according to the position of the through hole on the bottom ring edge, so as to facilitate limiting different shells on the top of the placement table. After the limiting rod passes through the through hole on the bottom ring edge, multiple limiting rods cooperate to limit the shell, so as to avoid the shell from shifting on the top of the placement table and ensure the stability of the shell during the air tightness detection process.

[0017] 3. The present invention uses a control component to enable the slider to drive the limiting rod to move, so that the position of the limiting rod inside the slide groove can be adjusted in real time according to the through hole on the bottom ring edge, so as to facilitate the detection of different shells on the top of the placement table. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall schematic diagram of a transmission housing air tightness detection device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic perspective cross-sectional view of a housing according to an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a housing placed on the top of a placement table according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a vertical rod in an embodiment of the present invention connected to the top end of a pressure head by a connecting component;

[0022] Figure 5 Schematic diagram of a pressure plate disposed on the top of the ring frame according to an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of a fixed placement platform on the top of a skateboard according to an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the inner part of the slideway of the placing table according to an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of a gear end portion connected to a ball bar using a connecting rod according to an embodiment of the present invention;

[0026] In the figure: 1. shell; 2. placing table; 3. slide plate; 4. slide frame; 5. bottom plate; 6. top plate; 7. slide rail; 8. first cylinder; 9. second cylinder; 10. vertical rod; 11. pressure head; 12. air inlet pipe; 13. air inlet; 14. air pressure sensor; 15. bottom ring edge; 16. sealing ring; 17. rotating sleeve; 18. clamping edge; 19. screw rod; 20. ring frame; 21. pressure plate; 22. pressure frame; 23. inner rod; 24. spring; 25. slider; 26. limiting rod; 27. gear; 28. round plate; 29. ​​side plate; 30. horizontal bar; 31. pull plate; 32. rack; 33. ball rod; 34. sleeve; 35. limiting frame; 36. side rod. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0028] The present invention provides a transmission housing airtightness detection device, such as Figures 1 to 4 As shown, it includes a shell 1, which is correspondingly buckled on the top surface of a placement table 2, and the placement table 2 is fixedly installed on the top surface of a slide plate 3. Slide racks 4 are fixed on both sides of the bottom surface of the slide plate 3. A bottom plate 5 is arranged at the bottom of the slide plate 3, and a top plate 6 is fixed on the top surface of the bottom plate 5 by using a plurality of support rods. Two relatively parallel slide rails 7 are fixed on the top surface of the bottom plate 5, and the two slide rails 7 correspond to the two slide racks 4 one by one, and a first cylinder 8 is arranged between the two slide rails 7, and the output end of the first cylinder 8 transmits and connects the bottom surface of the slide plate 3. When the first cylinder 8 works, the output end of the first cylinder 8 pushes the slide plate 3 to move, and the moving slide plate 3 passes through the slide rack 4. Sliding on the top of the slide rail 7, the top surface of the top plate 6 is fixed with a second cylinder 9, the bottom output end of the second cylinder 9 is connected to a vertical rod 10, the bottom end of the vertical rod 10 is connected to a pressure head 11 by a connecting component, one side of the pressure head 11 is connected to an air inlet pipe 12, the top opening of the shell 1 is provided with an air inlet 13, and the exhaust port at the bottom end of the pressure head 11 corresponds to the air inlet 13, the inner side of the shell 1 is provided with an air pressure sensor 14, the air pressure sensor 14 is electrically connected to the controller, and the controller obtains the air pressure condition inside the shell 1 through the signal transmitted by the air pressure sensor 14, and its setting method is a technology known to technicians in the relevant field. Put the shell 1 on the top surface of the placement table 2, start the first cylinder 8, and the output end of the first cylinder 8 pulls the slide plate 3 to move, and the moving slide plate 3 slides on the top of the slide rail 7 by the slide 4 until the slide plate 3 brings the shell 1 to the bottom end of the pressure head 11, and the first cylinder 8 stops working. The second cylinder 9 is working, and the vertical rod 10 at the output end of the second cylinder 9 drives the pressure head 11 to move downward by using the connecting parts, and the bottom end of the downwardly moved pressure head 11 cooperates and squeezes at the top air inlet 13 of the outer shell 1. At this time, the top end of the pressure head 11 corresponds to the blocked air inlet 13, and the pressure head 11 squeezes the outer shell 1 so that the bottom surface of the outer shell 1 corresponds to the top surface of the placement table 2. At this time, the bottom end of the outer shell 1 is in a blocked state, so that the top air inlet 13 and the bottom opening of the outer shell 1 are both in a sealed state, and the external gas enters the inside of the pressure head 11 through the air inlet pipe 12, and enters the inner side of the outer shell 1 through the exhaust port and the air inlet 13 at the bottom end of the pressure head 11, and the air pressure sensor 14 is used to detect the air tightness of the outer shell 1.

[0029] exist Figures 1 to 3In the embodiment, the bottom surface of the housing 1 is provided with a bottom ring edge 15, the bottom surface of the bottom ring edge 15 is provided with a ring groove, the inner side of the ring groove is clamped with a sealing ring 16, and the housing 1 is fitted with the top surface of the placement table 2 by the sealing ring 16 passing through the bottom surface of the bottom ring edge 15. The pressure of the pressure head 11 on the air inlet 13 causes the housing 1 to move downward, and the downwardly moving housing 1 cooperates with the placement table 2 to squeeze the sealing ring 16 inside the ring groove, and the sealing ring 16 is deformed under pressure, and the deformed sealing ring 16 is used to block the gap between the bottom surface of the bottom ring edge 15 and the placement table 2, so as to prevent the bottom opening of the housing 1 from leaking.

[0030] exist Figure 4 In the embodiment, the connecting component includes a rotating sleeve 17, a circularly arranged clamping edge 18 is fixed at the bottom of the outer circumferential surface of the vertical rod 10, and the rotating sleeve 17 is rotatably sleeved on the bottom end of the vertical rod 10 by using a plurality of clamping edges 18. A screw 19 is fixed at the top end of the pressure head 11, and the bottom end of the rotating sleeve 17 is spirally sleeved on the surface of the screw 19, and the bottom surface of the rotating sleeve 17 is in contact with the top surface of the pressure head 11. The bottom end of the screw 19 at the top end of the pressure head 11 is made to correspond to the bottom end of the rotating sleeve 17. Since the rotating sleeve 17 is limited by a plurality of clamping edges 18 at the bottom of the outer circumferential surface of the vertical rod 10, the spiral cooperation of the rotating rotating sleeve 17 and the screw 19 makes the pressure head 11 fixedly installed at the bottom end of the vertical rod 10. At this time, the bottom surface of the rotating sleeve 17 is in contact with the top surface of the pressure head 11, so that it is convenient to select a suitable pressure head 11 according to different housings 1, and it is convenient for the bottom end of the pressure head 11 to cooperate with the air inlet 13 at the top of the housing 1.

[0031] exist Figure 1 , Figure 3 and Figure 5 In the figure, a buffer component is arranged on the top surface of the placing table 2, and the buffer component includes a ring frame 20, which is fixed on the top surface of the placing table 2, a pressure plate 21 is arranged on the top of the ring frame 20, and the air pressure sensor 14 is installed on the top surface of the pressure plate 21 accordingly, a pressure frame 22 is fixed on the bottom surface of the pressure plate 21, and the pressure frame 22 passes through the center of the top surface of the ring frame 20, and the bottom end of the pressure frame 22 is inside the ring frame 20, and a plurality of inner rods 23 are fixed on the inner side of the ring frame 20, and the inner rods 23 pass through the bottom surface of the pressure frame 22 accordingly, and a spring 24 is sleeved on the surface of the inner rod 23, and the top end of the spring 24 is connected to the bottom surface of the pressure frame 22, and the bottom end of the spring 24 is connected to the top surface of the placing table 2. When the bottom end of the pressure head 11 is pressed against the top of the air inlet 13, the pressure of the pressure head 11 on the air inlet 13 causes the outer shell 1 to move downward, and the downward moving outer shell 1 drives the pressure plate 21 to move downward synchronously, and the downward moving pressure plate 21 drives the pressure frame 22 to move downward on the inner side of the ring frame 20, and the pressure frame 22 cooperates with the placement table 2 to squeeze the spring 24 on the surface of the inner rod 23 until the deformed sealing ring 16 blocks the gap between the bottom surface of the bottom ring edge 15 and the placement table 2. At this time, the bottom end of the pressure head 11 blocks the air inlet 13, so that the outer shell 1 is in a sealed state.

[0032] After the air tightness test of the outer shell 1 is completed, the output end of the second cylinder 9 uses the vertical rod 10 and the connecting parts to pull the pressure head 11 upward, and the elastic force of the spring 24 makes the pressure frame 22 and the pressure plate 21 move upward on the inner side of the ring frame 20. The upward pressure plate 21 drives the outer shell 1, and the elastic force of the spring 24 makes the top of the air inlet 13 fit with the bottom surface of the pressure head 11 until the pressure frame 22 moves to the top of the inner side of the ring frame 20, and the upward bottom end of the pressure head 11 is separated from the air inlet 13, making it convenient to remove the outer shell 1 from the outside of the ring frame 20.

[0033] exist Figure 3 , Figure 6 and Figure 7 In the embodiment, the top surface of the placing platform 2 is provided with four slide grooves, the inner side of the slide grooves is provided with sliders 25, the top surface of the sliders 25 is fixed with limiting rods 26, the corners of the placing platform 2 are provided with control components for adjusting the sliders 25, the four corners of the bottom ring edge 15 are provided with through holes, and the bottom ring edge 15 is buckled on the surface of the limiting rods 26 by corresponding through holes. The control component enables the slider 25 to move synchronously when the slider 25 moves inside the slide groove, and the position of the limiting rod 26 on the inside is adjusted according to the position of the through hole of the bottom ring edge 15, so as to facilitate the limiting of different shells 1 on the top of the placing platform 2. After the limiting rods 26 pass through the through holes of the bottom ring edge 15, multiple limiting rods 26 cooperate to limit the shell 1, so as to prevent the shell 1 from shifting on the top of the placing platform 2 and ensure the stability of the shell 1 during the air tightness detection process.

[0034] exist Figure 6 and Figure 7 In the embodiment, the control component includes a gear 27, and a circular plate 28 is fixed to both ends of the gear 27 by a connecting rod. Two parallel side plates 29 are fixed at the corners of the placing table 2, and the gear 27 is located between the two side plates 29. The connecting rod passes through the side plates 29. A horizontal bar 30 is fixed to the top of the outer end of the slider 25, and a pull plate 31 is fixed to the outer end of the horizontal bar 30. A rack 32 is fixed to the bottom of the outer end of the slider 25, and the rack 32 is meshed with the gear 27. The pull plate 31 drives the slider 25 to slide inside the slide groove by the horizontal bar 30, and the sliding slider 25 drives the limiting rod 26 to move synchronously, and the moving slider 25 drives the rack 32 to move synchronously, and the moving rack 32 drives the gear 27 to rotate, and the rotating gear 27 drives the circular plate 28 to rotate by the connecting rod, so as to facilitate the control of the bidirectional rotation of the circular plate 28.

[0035] exist Figure 3 , Figures 6 to 8In the embodiment, a ball rod 33 is fixed to the outer end of the circular plate 28, and sleeves 34 are arranged on the outer sides of the four sides of the placing platform 2. The sleeves 34 are made of rubber material, and both ends of the sleeves 34 are sleeved with limiting frames 35. The outer ends of the limiting frames 35 are provided with ball head sleeves, and the limiting frames 35 are sleeved on the outer ends of the ball rods 33 by using the ball head sleeves. The inner ends of the limiting frames 35 are fixed with plug rods, and the plug rods are correspondingly inserted into the ends of the sleeves 34. The side of the placing platform 2 is fixed with side rods 36 that penetrate the sleeves 34. The gear 27 drives the circular plate 28 to rotate by using the connecting rod, and the rotating circular plate 28 drives the limiting frame 35 to rotate by using the ball rod 33 and the ball head sleeve. When the circular plate 28 rotates, the rotating circular plate 28 drives the ball rod 33 to swing, and the swinging ball rod 33 drives the limiting frame 35 to rotate synchronously by using the ball head sleeve. Since the sleeve 34 is set to be made of rubber material, the rotating limiting frame 35 drives the end of the sleeve 34 to rotate. When the swinging ball rod 33 drives the limiting frame 35 away from the placement table 2 by using the ball head sleeve, the rotating limiting frame 35 drives the end of the sleeve 34 to rotate, and the rotating limiting frame 35 drives the sleeve 34 to move, and the moving sleeve 34 moves away from the placement table 2. Since the side rod 36 passes through the center of the sleeve 34, the moving sleeve 34 moves on the surface of the side rod 36, and the moving sleeve 34 drives the adjacent ball rod 33 to swing synchronously by using another limiting frame 35, so that the adjacent circular plate 28 and gear 27 rotate, and the meshing cooperation of the gear 27 and the rack 32 is used to facilitate the real-time adjustment of the position of the limiting rod 26 on the inner side of the slide groove according to the through hole of the bottom ring edge 15, so as to facilitate the detection of different shells 1 on the top of the placement table 2.

[0036] Working principle of the present invention:

[0037] Reference Figures 1 to 8 As shown, the pull plate 31 utilizes the horizontal bar 30 to drive the slider 25 to slide inside the slide groove, the sliding slider 25 drives the limiting rod 26 to move synchronously, and the moving slider 25 drives the rack 32 to move synchronously, the moving rack 32 drives the gear 27 to rotate, and the rotating gear 27 utilizes the connecting rod to drive the circular plate 28 to rotate, so as to facilitate the control of the bidirectional rotation of the circular plate 28. When the circular plate 28 rotates, the rotating circular plate 28 drives the ball rod 33 to swing, and the swinging ball rod 33 drives the limiting frame 35 to rotate synchronously by using the ball head sleeve. Since the sleeve 34 is set to be made of rubber material, the rotating limiting frame 35 drives the end of the sleeve 34 to rotate. When the swinging ball rod 33 drives the limiting frame 35 away from the placement table 2 by using the ball head sleeve, the rotating limiting frame 35 drives the end of the sleeve 34 to rotate, and the rotating limiting frame 35 drives the sleeve 34 to move. The moving sleeve 34 moves away from the placement table 2. Since the side rod 36 passes through the center of the sleeve 34, the moving sleeve 34 moves on the surface of the side rod 36. The moving sleeve 34 drives the adjacent ball rod 33 to swing synchronously by using another limiting frame 35, thereby causing the adjacent circular plate 28 and gear 27 to rotate.

[0038] By utilizing the meshing cooperation of the gear 27 and the rack 32, when the slider 25 moves inside the slide groove, the moving slider 25 drives the limiting rod 26 to move synchronously, and the position of the limiting rod 26 on the inside is adjusted according to the position of the through hole of the bottom ring edge 15, so as to facilitate limiting different shells 1 on the top of the placement table 2. After the limiting rod 26 passes through the through hole of the bottom ring edge 15, multiple limiting rods 26 cooperate to limit the shell 1, so as to avoid the shell 1 from shifting on the top of the placement table 2, thereby ensuring the stability of the shell 1 during the air tightness detection process.

[0039] The housing 1 is buckled on the outside of the ring frame 20 on the top surface of the placement table 2, and the first cylinder 8 is started. The output end of the first cylinder 8 pulls the slide plate 3 to move. The moving slide plate 3 slides on the top of the slide rail 7 using the slide frame 4 until the slide plate 3 brings the housing 1 to the bottom of the pressure head 11, and the first cylinder 8 stops working. The second cylinder 9 works, and the vertical rod 10 at the output end of the second cylinder 9 drives the pressure head 11 to move downward using the connecting component. The bottom end of the downward pressure head 11 cooperates and presses at the top air inlet 13 of the housing 1. At this time, the top of the pressure head 11 corresponds to the blocked air inlet 13, and the pressure head 11 squeezes the housing 1 so that the bottom surface of the housing 1 is correspondingly attached to the top surface of the placement table 2. At this time, the bottom end of the housing 1 is in a blocked state, so that the top air inlet 13 and the bottom opening of the housing 1 are both in a sealed state. The external gas enters the inside of the pressure head 11 through the air inlet pipe 12, and enters the inner side of the housing 1 through the exhaust port and the air inlet 13 at the bottom of the pressure head 11. The air tightness of the housing 1 is detected by the air pressure sensor 14.

[0040] After the air tightness test of the outer shell 1 is completed, the output end of the second cylinder 9 uses the vertical rod 10 and the connecting parts to pull the pressure head 11 upward, and the elastic force of the spring 24 makes the pressure frame 22 and the pressure plate 21 move upward on the inner side of the ring frame 20. The upward pressure plate 21 drives the outer shell 1, and the elastic force of the spring 24 makes the top of the air inlet 13 fit with the bottom surface of the pressure head 11 until the pressure frame 22 moves to the top of the inner side of the ring frame 20, and the upward bottom end of the pressure head 11 is separated from the air inlet 13, which makes it convenient to remove the outer shell 1 from the outside of the ring frame 20, and then put the new outer shell 1 on the outside of the ring frame 20.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A transmission housing air tightness detection device, comprising a housing (1), wherein the housing (1) is correspondingly buckled on the top surface of a placement table (2), and the placement table (2) is fixedly mounted on the top surface of a slide plate (3), characterized in that: Slide racks (4) are fixed on both sides of the bottom surface of the slide plate (3); a bottom plate (5) is arranged at the bottom of the slide plate (3); a top plate (6) is fixed to the top surface of the bottom plate (5) by means of a plurality of support rods; two relatively parallel slide rails (7) are fixed to the top surface of the bottom plate (5); the two slide rails (7) correspond to the two slide racks (4) one by one, and a first cylinder (8) is arranged between the two slide rails (7); the output end of the first cylinder (8) is connected to the bottom surface of the slide plate (3); when the first cylinder (8) is working, the output end of the first cylinder (8) pushes the slide plate (3) to move The movable slide plate (3) slides on the top of the slide rail (7) through the slide frame (4); a second cylinder (9) is fixed on the top surface of the top plate (6); a vertical rod (10) is connected to the bottom output end of the second cylinder (9); a pressure head (11) is connected to the bottom end of the vertical rod (10) by a connecting component; an air inlet (12) is connected to one side of the pressure head (11); an air inlet (13) is provided at the top opening of the housing (1); and an exhaust port at the bottom end of the pressure head (11) corresponds to the air inlet (13); and an air pressure sensor (14) is provided on the inner side of the housing (1); The bottom surface of the housing (1) is provided with a bottom ring edge (15), the bottom surface of the bottom ring edge (15) is provided with a ring groove, the inner side of the ring groove is clamped with a sealing ring (16), and the housing (1) is fitted with the top surface of the placement table (2) by means of the sealing ring (16) passing through the bottom surface of the bottom ring edge (15); The top surface of the placement table (2) is provided with a buffer component, and the buffer component includes a ring frame (20), the ring frame (20) is fixed on the top surface of the placement table (2), a pressure plate (21) is provided on the top of the ring frame (20), and the air pressure sensor (14) is correspondingly installed on the top surface of the pressure plate (21), and a pressure frame (22) is fixed on the bottom surface of the pressure plate (21), and the pressure frame (22) passes through the center of the top surface of the ring frame (20), and the bottom end of the pressure frame (22) is inside the ring frame (20), and a plurality of inner rods (23) are fixed on the inner side of the ring frame (20), and the inner rods (23) pass through the bottom surface of the pressure frame (22) correspondingly, and a spring (24) is sleeved on the surface of the inner rod (23), and the top end of the spring (24) is connected to the bottom surface of the pressure frame (22), and the bottom end of the spring (24) is connected to the top surface of the placement table (2); The top surface of the placement platform (2) is provided with four slide grooves, a slider (25) is provided inside the slide groove, a limiting rod (26) is fixed to the top surface of the slider (25), a control component for adjusting the slider (25) is provided at the corner of the placement platform (2), and through holes are provided at the four corners of the bottom ring edge (15), and the bottom ring edge (15) is buckled on the surface of the limiting rod (26) by using the through holes; The control component comprises a gear (27), both ends of the gear (27) are fixed with a circular plate (28) by a connecting rod, two parallel side plates (29) are fixed at the corners of the placement table (2), the gear (27) is located between the two side plates (29), the connecting rod passes through the side plates (29), a horizontal bar (30) is fixed to the top of the outer end of the slider (25), a pull plate (31) is fixed to the outer end of the horizontal bar (30), and a rack (32) is fixed to the bottom of the outer end of the slider (25), and the rack (32) is meshed with the gear (27); A ball rod (33) is fixed to the outer end of the circular plate (28); sleeves (34) are arranged on the outer sides of the four side edges of the placement platform (2); the sleeves (34) are made of rubber material; both ends of the sleeves (34) are sleeved with limiting frames (35); a ball head sleeve is arranged on the outer end of the limiting frame (35); and the limiting frame (35) is sleeved on the outer end of the ball rod (33) by means of the ball head sleeve; an insertion rod is fixed to the inner end of the limiting frame (35); the insertion rod is correspondingly inserted into the end of the sleeve (34); and a side rod (36) penetrating the sleeve (34) is fixed to the side of the placement platform (2); The gear (27) drives the circular plate (28) to rotate by means of a connecting rod, and the rotating circular plate (28) drives the limiting frame (35) to rotate by means of a ball rod (33) and a ball head cover.

2. The transmission case airtightness detection device according to claim 1, characterized in that: The connecting component comprises a rotating sleeve (17), a circularly arranged clamping edge (18) is fixed to the bottom of the circumferential outer side surface of the vertical rod (10), the rotating sleeve (17) is rotatably sleeved on the bottom end of the vertical rod (10) by means of a plurality of clamping edges (18), a screw rod (19) is fixed to the top surface of the pressure head (11), the bottom end of the rotating sleeve (17) is spirally sleeved on the surface of the screw rod (19), and the bottom surface of the rotating sleeve (17) is in contact with the top surface of the pressure head (11).

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