Shell leak detection tool

Abstract

A shell leak detection tool comprises a working platform and a pressing assembly, a placing plate and a sealing ring are arranged on the working platform, a groove matched with a shell to be detected in shape is formed in the placing plate, a first part of the sealing ring is arranged in the groove, the front end of the placing plate extends upwards to form a protrusion matched with an inverted-U-shaped opening in shape, and a second part of the sealing ring is arranged in the protrusion. The bulge is provided with an inverted U-shaped mounting groove corresponding to the top plate of the shell to be tested and the left and right connecting parts, the left and right ends of the mounting groove are connected with the groove, and the second part of the sealing ring can be embedded into the mounting groove; the pressing assembly comprises a pressing plate and a pressing head, and in the state that the pressing plate moves downwards to abut against the top plate and the pressing head moves downwards to abut against the wing part, the second part of the sealing ring can seal the first corner and the second corner through the protrusion. The sealing device has the advantages that the protrusion, the pressing plate and the pressing head are used for enabling the sealing ring to be completely connected with the inverted-U-shaped opening of the shell to be tested in an abutting mode, and therefore sealing of the cavity to be tested is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts detection, in particular to a leak detection tool for a shell. Background Art

[0002] At present, the shells in automobiles, such as gearbox shells and motor shells, need to be tested for air tightness. The air tightness test of the shell is traditionally carried out manually, which is not only inefficient but also has low detection accuracy. In order to improve the efficiency and accuracy of the shell air tightness test, a leak detection tool is usually used to test the shell for air tightness. For example, the applicant has proposed a shell leak detection tool, as shown in the Chinese invention application "A leak detection device for a gearbox shell" with patent number CN201911373780.3 (application publication number CN111024317A). The workbench of the leak detection device is provided with a placement plate with a detection flow channel, and the gearbox shell is placed on the placement plate. A movable plate that can move up and down is also provided above the placement plate. The movable plate can drive the clamping assembly and the upper hole plugging assembly to move downward to abut against the upper end of the gearbox shell, thereby achieving the purpose of clamping and plugging.

[0003] Although the leak detection tool mentioned above can compress the shell to perform airtightness detection, if the parts to be assembled are Figure 1 and 2 The housing shown will present another assembly problem. The front end of the housing to be tested 1' has an inverted "U"-shaped opening 14'. The opening 14' is surrounded by a top plate 11', connecting portions 12' located on the left and right sides of the top plate 11' and extending obliquely downward, and wings 13' located at the bottom of the connecting portion 12' and extending horizontally outward. The connection between the top plate 11' and the connecting portion 12' has a first corner 15', and the connection between the connecting portion 12' and the wing 13' has a second corner 16'.

[0004] If the above-mentioned leak detection fixture is used to perform airtightness testing on the shell 1′ to be tested, the shell 1′ to be tested needs to be placed on a placement plate, and the placement plate needs to be provided with an annular sealing ring to resist the cavity to be tested. Since the opening 14′ of the shell 1′ to be tested is in an inverted "U" shape, part of the sealing ring also needs to bulge upward to match the opening 14′. However, the first corner 15′ and the second corner 16′ are approximately right angles, so the upward-bulging bend of the sealing ring cannot contact the first corner 15′ and the second corner 16′, resulting in air leakage when the leak detection fixture detects the airtightness of the shell 1′ to be tested, thereby affecting the result of the airtightness test of the shell 1′ to be tested. For this reason, further improvements need to be made to the leak detection fixture for the shell. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a leak detection tool that can improve the sealing performance of a shell in view of the above-mentioned existing technical status, and is particularly suitable for a cavity to be tested with an inverted "U"-shaped opening.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: the shell leak detection tool comprises a working platform for placing the shell to be tested and a clamping assembly for clamping the shell to be tested, the clamping assembly is located above the working platform, the working platform is provided with a placement plate and a sealing ring, the placement plate is provided with a groove adapted to the shape of the shell to be tested, the first part of the sealing ring is arranged in the groove, and is characterized in that:

[0007] The front end of the placement plate extends upward to form a protrusion with a shape that is adapted to the inverted "U"-shaped opening. The protrusion is provided with an inverted "U"-shaped mounting groove corresponding to the top plate of the shell to be tested and the left and right connecting parts. The left and right ends of the inverted "U"-shaped mounting groove are connected to the groove. The second part of the sealing ring except the first part can be embedded in the mounting groove; correspondingly,

[0008] The pressing assembly includes a pressing plate for pressing the top plate of the shell to be tested and a pressing head for pressing the wing of the shell to be tested, and the pressing heads are arranged on the left and right sides of the pressing plate;

[0009] When the pressure plate moves downward to abut against the top plate and the pressure head moves downward to abut against the wing, the second portion of the sealing ring can seal the first corner and the second corner by means of the protrusion.

[0010] To enable the pressing plate and the pressing head to move up and down, the clamping assembly preferably further comprises a movable plate capable of moving up and down and a plurality of pressing rods disposed on the lower surface of the movable plate. The pressing rods are divided into an upper section connected to the pressing plate and a lower section connected to the pressing head. The movable plate is capable of driving the pressing plate and the pressing head to move up and down by means of the upper and lower sections. The driving member is capable of driving the movable plate to move up and down, and the movable plate drives the pressing plate and the pressing head to move up and down via the pressing rods to press against or release the top plate and wings of the housing to be tested.

[0011] To ensure that the pressure plate and the pressure head can respectively press against the top plate and the wings, the lower end of the pressure head is preferably lower than the lower surface of the pressure plate, and the lower section is provided with an elastic member with a buffering function. The elastic member can be a spring. The movable plate drives the upper and lower sections to move downward together, causing the pressure plate connected to the upper section and the pressure head connected to the lower section to move downward together, thereby causing the pressure plate and the pressure head to press against the top plate and the wings, respectively. The spring can buffer the pressure of the pressure plate and the pressure head through the pressure rod.

[0012] In order to seal the test cavity of the test housing, preferably, the placement plate is provided with a filling block adjacent to the rear side of the protrusion, and the shape of the filling block matches the test cavity. The test housing is placed on the placement plate, and the filling block is installed in the test cavity.

[0013] To pre-position the housing under test, the placement plate is preferably provided with positioning posts on the periphery of the filler block. These posts are inserted into positioning holes in the wings of the housing under test, and are positioned further outward than the pressure head. The positioning posts, in conjunction with the positioning holes, allow the housing under test to be pre-positioned on the placement plate before being pressed by the clamping assembly.

[0014] To prevent the housing to be tested from moving on the placement plate, the placement plate is preferably provided with a stopper adjacent to the positioning post for limiting the position of the housing to be tested. The stopper is disposed around the housing to be tested and is capable of abutting against the outer peripheral wall of the housing to be tested. The stopper can abut against all four sides of the housing to be tested, thereby preventing the housing to be tested from moving on the placement plate.

[0015] To enable the leak detection tool to plug the through-hole of the housing to be tested, preferably, a side plug assembly is provided at the rear end of the work platform. The side plug assembly is located on the side opposite the protrusion and includes a cylinder and a plug connected to the cylinder's driving end. The cylinder is capable of driving the plug to plug the through-hole of the housing to be tested. The leak detection tool plugs the through-hole of the housing to be tested via the movable plug.

[0016] In order to facilitate marking of the shell to be tested, preferably, the work platform is further provided with a marking assembly, which can perform single-point or double-point marking on the side wall of the wing. The marking assembly marks the shell to be tested accordingly according to the test results of the leak detection tool.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The placement plate of the leak detection tool is provided with a protrusion, and the protrusion is provided with an inverted "U"-shaped installation groove. The left and right ends of the inverted "U"-shaped installation groove are connected to the groove, so that the second part of the sealing ring can abut against the top plate and the connecting part of the shell to be tested, thereby sealing the inverted "U"-shaped opening of the part;

[0019] 2. The compression assembly for leak detection includes a pressure plate and a pressure head. When the pressure plate and the pressure head are respectively against the top plate and the wing, the shell to be tested uses the protrusion to enable the second part of the sealing ring to seal the first corner and the second corner, thereby completing the sealing of the inverted "U"-shaped opening of the shell to be tested, making it convenient for users to perform airtightness testing on the shell to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of the structure of the shell to be tested in the background technology;

[0021] Figure 2 A schematic diagram of the structure of the housing to be tested from another perspective in the background technology;

[0022] Figure 3 This is a schematic structural diagram of an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the structure of placing the housing to be tested on the placement plate in an embodiment of the utility model;

[0024] Figure 5 This is a schematic structural diagram of the working platform, placement plate, sealing ring, side blocking assembly and marking assembly in an embodiment of the present utility model;

[0025] Figure 6 This is an exploded schematic diagram of the sealing ring and the placement plate in the embodiment of the present utility model;

[0026] Figure 7 It is a structural schematic diagram of the clamping assembly in an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0028] like Figures 3 to 7 Shown is the best embodiment of the present utility model.

[0029] like Figures 3 to 7As shown, the leak detection fixture of this embodiment is used to detect the housing 1′ to be tested. The front end of the housing 1′ to be tested has an inverted "U"-shaped opening 14′, which is surrounded by a top plate 11′, connecting portions 12′ located on the left and right sides of the top plate 11′ and extending obliquely downward, and wing portions 13′ located at the bottom of the connecting portion 12′ and extending horizontally outward. The connection between the top plate 11′ and the connecting portion 12′ has a first corner 15′, and the connection between the connecting portion 12′ and the wing portion 13′ has a second corner 16′. A through hole 17′ is provided at the rear end of the housing 1′ to be tested. The leak detection tool of this embodiment includes a working platform 2 for placing a housing 1' to be tested and a pressing assembly 3 for pressing the housing 1' to be tested. The pressing assembly 3 is located above the working platform 2. A placing plate 4 and a sealing ring 5 are provided on the working platform 2. The placing plate 4 is provided with a groove 41 that is adapted to the shape of the housing 1' to be tested. The first part 51 of the sealing ring 5 is arranged in the groove 41. The front end of the placing plate 4 extends upward to form a protrusion 42 that is adapted to the inverted "U"-shaped opening 14'. The protrusion 42 is provided with an inverted "U"-shaped mounting groove 421 corresponding to the top plate 11' of the housing 1' to be tested and the left and right connecting parts 12'. The left and right ends of the "U"-shaped mounting groove 421 are connected to the groove 41. In addition to the first portion 51, the second portion 52 of the sealing ring 5 can be embedded in the mounting groove 421. Correspondingly, the clamping assembly 3 includes a pressure plate 31 for clamping the top plate 11' of the housing 1' to be tested and a pressure head 32 for clamping the wing 13' of the housing 1' to be tested. The pressure head 32 is arranged on the left and right sides of the pressure plate 31. When the pressure plate 31 moves downward to abut against the top plate 11' and the pressure head 32 moves downward to abut against the wing 13', the second portion 52 of the sealing ring 5 can seal the first corner 15' and the second corner 16' with the help of the protrusion 42. In addition, the rear end of the working platform 2 of this embodiment is provided with a side blocking assembly 6. The side blocking assembly 6 is arranged on the opposite side of the protrusion 42 to block the through hole 17' on the housing 1' to be tested. In addition, a marking assembly 7 is provided on one side of the working platform 2 of this embodiment. The marking assembly 7 can perform single-point or double-point marking on the side wall of the wing 13'. The marking assembly 7 performs corresponding marking on the shell 1' to be tested according to the detection results.

[0030] like Figures 4-6As shown, the placement plate 4 of this embodiment is provided with a filling block 43, two positioning posts 44 are provided on the periphery of the filling block 43, and a limit block 45 adjacent to each corresponding positioning post 44, wherein the shape of the filling block 43 matches the cavity to be tested. When the shell 1' to be tested is placed on the placement plate 4, it is used to fill most of the area of ​​the cavity to be tested, leaving only a relatively small gap between the sealing ring 5 and the filling block 43, so as to achieve a faster detection speed using a smaller inflation volume and improve the detection efficiency. In addition, the two positioning posts 44 provided on the two wings 13' (which may be referred to as the left wing and the right wing), which can also be referred to as the left positioning post and the right positioning post, can be respectively inserted into the corresponding positioning holes 131' of the left wing and the right wing. Through the cooperation between the positioning posts 44 and the positioning holes 131', the shell 1' to be tested can be pre-positioned by the positioning posts 44 at the predetermined position of the placement plate 4 before being compressed by the clamping assembly 3. The limit block 45 is used to limit the position of the housing 1' to be tested. It is arranged around the housing 1' to abut against the outer peripheral wall of the housing 1' to prevent the housing 1' from moving on the placement plate 4. In addition, the side blocking assembly 6 of this embodiment includes a cylinder 61 and a plug 62 connected to the driving end of the cylinder 61. The cylinder 61 can drive the plug 62 to block the through hole 151' of the connecting plate 15'. The leak detection tool blocks the through hole 17' of the housing 1' to be tested via the movable plug 62.

[0031] like Figure 7 As shown, the clamping assembly 3 of this embodiment also includes a movable plate 33 that can move up and down and a plurality of pressure rods 34 arranged on the lower surface of the movable plate 33. The pressure rod 34 is divided into an upper section 341 connected to the pressure plate 31 and a lower section 342 connected to the pressure head 32. The movable plate 33 can drive the pressure plate 31 and the pressure head 32 to move up and down with the help of the upper section 341 and the lower section 342. In addition, in order to enable the pressure plate 31 and the pressure head 32 to respectively press against the top plate 11′ and the wing 13′, the lower end of the pressure head 32 of this embodiment is lower than the lower surface of the pressure plate 31, and an elastic member 343 with a buffering function is provided on the upper section 341. The elastic member 343 of this embodiment is a spring. Since the movable plate 33 drives the upper section 341 and the lower section 342 to move downward together, the pressure plate 31 connected to the upper section 341 and the pressure head 32 connected to the lower section 342 move downward together, so that the pressure plate 31 and the pressure head 32 are respectively pressed against the top plate 11′ and the wing 13′, and the spring can buffer the pressure of the pressure plate 31 and the pressure head 32 through the pressure rod 34.

[0032] The workflow of this embodiment is:

[0033] A. First, place the housing 1′ to be tested on the placement plate 4. That is, install the filling block 43 in the cavity to be tested. The left and right positioning posts can be inserted into the corresponding positioning holes 131′ of the left and right wings, respectively. Through the cooperation between the positioning posts 44 and the positioning holes 131′, the housing 1′ to be tested is pre-positioned on the placement plate 4. The multiple limit blocks 45 abut the outer peripheral wall of the housing 1′ to be tested to prevent the housing 1′ to be tested from moving on the placement plate 4. The first portion 51 of the sealing ring 5 abuts the corresponding housing 1′ to be tested, and the second portion 52 of the sealing ring 5 abuts the top plate 11′ and the connecting portion 12′.

[0034] B. Then the cylinder 61 of the side blocking assembly 6 drives the plug 62 to move to block the through hole 17' on the housing 1' to be tested;

[0035] C. The driving member then drives the movable plate 33 downward. The movable plate 33 drives the pressing plate 31 and the pressing head 32 downward by means of the upper section 341 and the lower section 342. The pressing plate 31 presses against the top plate 11', the pressing head 32 presses against the wing portion 13', and the protrusion 42 causes the second portion 52 of the sealing ring 5 to seal the first corner 15' and the second corner 16', thereby causing the sealing ring 5 to seal the inverted "U"-shaped opening 14', thereby completing the sealing of the housing 1' to be tested.

[0036] D. Finally, perform an airtightness test on the shell 1 ′ to be tested, and the marking component 7 marks the shell 1 ′ to be tested accordingly according to the test result.

Claims

1. A leak detection tool for a housing, comprising a working platform (2) for placing a housing (1′) to be tested and a pressing assembly (3) for pressing the housing (1′) to be tested, wherein the pressing assembly (3) is located above the working platform (2), a placing plate (4) and a sealing ring (5) are provided on the working platform (2), the placing plate (4) is provided with a groove (41) that is adapted to the shape of the housing (1′) to be tested, and a first portion (51) of the sealing ring (5) is arranged in the groove (41), characterized in that: The front end of the placement plate (4) extends upward to form a protrusion (42) whose shape is adapted to the inverted "U"-shaped opening (14'), and the protrusion (42) is provided with an inverted "U"-shaped installation groove (421) corresponding to the top plate (11') of the shell (1') to be tested and the left and right connecting parts (12'), and the left and right ends of the inverted "U"-shaped installation groove (421) are connected to the groove (41), and the second part (52) of the sealing ring (5) except the first part (51) can be embedded in the installation groove (421); correspondingly, The pressing assembly (3) includes a pressing plate (31) for pressing the top plate (11') of the housing to be tested (1') and a pressing head (32) for pressing the wing portion (13') of the housing to be tested (1'), wherein the pressing head (32) is arranged on the left and right sides of the pressing plate (31); When the pressure plate (31) moves downward to abut against the top plate (11′) and the pressure head (32) moves downward to abut against the wing portion (13′), the second portion (52) of the sealing ring (5) can seal the first corner (15′) and the second corner (16′) by means of the protrusion (42).

2. The leak detection tool according to claim 1, characterized in that: The clamping assembly (3) further comprises a movable plate (33) capable of moving up and down and a plurality of pressure rods (34) arranged on the lower surface of the movable plate (33); the pressure rods (34) are divided into an upper section (341) connected to the pressure plate (31) and a lower section (342) connected to the pressure head (32); the movable plate (33) can drive the pressure plate (31) and the pressure head (32) to move up and down by means of the upper section (341) and the lower section (342).

3. The leak detection tool according to claim 2, characterized in that: The lower end of the pressure head (32) is lower than the lower surface of the pressure plate (31), and the lower section (342) is provided with an elastic member (343) with a buffering function.

4. The leak detection tool according to any one of claims 1 to 3, characterized in that: A filling block (43) is provided on the rear side of the placement plate (4) adjacent to the protrusion (42), and the shape of the filling block (43) matches the cavity to be tested.

5. The leak detection tool according to claim 4, characterized in that: The placement plate (4) is further provided with a positioning column (44) on the periphery of the filling block (43). The positioning column (44) can be inserted into the positioning hole (131') of the wing portion (13') of the shell (1') to be tested. The positioning column (44) is located further outward than the pressure head (32).

6. The leak detection tool according to claim 5, characterized in that: The placement plate (4) is also provided with a limiting block (45) adjacent to the positioning column (44) for limiting the position of the housing to be measured (1′). The limiting block (45) is arranged around the housing to be measured (1′), and the limiting block (45) can abut against the outer peripheral wall of the housing to be measured (1′).

7. The leak detection tool according to claim 5 or 6, characterized in that: A side blocking assembly (6) is provided at the rear end of the working platform (2). The side blocking assembly (6) is provided on the opposite side of the protrusion (42) and comprises a cylinder (61) and a plug (62) connected to the driving end of the cylinder (61). The cylinder (61) is capable of driving the plug (62) to block the through hole (17') on the housing (1') to be tested.

8. The leak detection tool according to claim 7, characterized in that: The work platform (2) is also provided with a marking component (7), and the marking component (7) can perform single-point or double-point marking on the side wall of the wing portion (13') of the shell (1') to be tested.

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