Engine cover leakage testing device

Abstract

The utility model discloses an engine cover leakage testing device, which comprises an upper tool and a lower tool which are oppositely arranged up and down, a positioning mechanism and a ventilation mechanism are arranged between the upper tool and the lower tool, and the lower tool is provided with a carrying table for placing a product to be tested. The positioning mechanism comprises a horizontal positioning mechanism arranged on the carrying table and a vertical positioning mechanism arranged on the upper tool, the horizontal positioning mechanism is matched with the side of the to-be-tested product, and the bottom of the vertical positioning mechanism is matched with the top surface of the to-be-tested product; the horizontal positioning mechanism and the vertical positioning mechanism are used for limiting the product to be detected on the carrying table from the horizontal direction and the vertical direction respectively; the ventilation mechanism comprises an on-off valve, connecting ports and plugging heads, the plugging heads are movably arranged on the upper tool to plug the ports of the product to be tested, the on-off valve is arranged on one side of the carrying table, the connecting ports are arranged on the carrying table, and the plugging heads are arranged on the other side of the carrying table. And the on-off valve is communicated with the interior of the product to be tested through the group of connecting ports so as to carry out a leakage test. According to the scheme, positioning of irregular products to be tested is facilitated, and reliable leakage testing is carried out.

Description

Technical Field

[0001] This utility model relates to the field of engine manufacturing equipment technology, and specifically to an engine cover leakage testing device. Background Technology

[0002] A car engine mainly consists of four assemblies: the cylinder head cover, the cylinder head, the cylinder block, and the oil pan. The cylinder head cover, as part of the engine's top sealing system, is sealed to the outside of the cylinder head and cylinder block, ensuring the overall sealing of the engine and protecting the cylinder head system from external interference.

[0003] The sealing performance of the cylinder head cover is so important that it must undergo leakage testing before leaving the factory to ensure its qualification. However, cylinder head covers are usually not regular in shape, and figuring out how to fit them to complete the leakage test is a problem that urgently needs to be solved. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an engine cover leakage test device.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An engine hood leakage test device includes an upper fixture and a lower fixture arranged opposite each other. A positioning mechanism and a venting mechanism are provided between the upper and lower fixtures. A platform for placing a product under test is provided on the lower fixture. The positioning mechanism includes a horizontal positioning mechanism disposed on the platform and a vertical positioning mechanism disposed on the upper fixture. The horizontal positioning mechanism matches the side of the product under test, and the bottom of the vertical positioning mechanism matches the top surface of the product under test. The horizontal and vertical positioning mechanisms respectively constrain the product under test on the platform from the horizontal and vertical directions. The venting mechanism includes an on / off valve, a connecting port, and a sealing head. A set of sealing heads is movably disposed on the upper fixture to seal the port of the product under test. The on / off valve is disposed on one side of the platform, and a set of connecting ports is disposed on the platform. The on / off valve is connected to the interior of the product under test through the set of connecting ports to perform leakage testing.

[0007] Preferably, the horizontal positioning mechanism includes a set of eccentric positioning blocks rotatably disposed on the platform along the side of the product to be tested. A set of positioning shafts is disposed on the platform along the side of the product to be tested. The eccentric positioning blocks are provided with a central through hole that is not coaxial with their axis. The positioning shafts pass through the central through hole to allow the eccentric positioning blocks to rotate eccentrically. The set of eccentric positioning blocks clamp the product to be tested by tightly fitting against the side of the product to be tested through eccentric rotation, thereby limiting the horizontal position of the product to be tested.

[0008] Preferably, the horizontal positioning mechanism further includes a contouring fixing block fixed on the platform, the outer contour of the contouring fixing block matching the inner contour of the product to be tested, so that the product to be tested is placed on the contouring fixing block, and a photoelectric sensor is respectively arranged on two opposite corners of the platform to detect the placement of the product to be tested.

[0009] Preferably, the vertical positioning mechanism is located above the platform. The vertical positioning mechanism includes a set of linear cylinders and pressure heads that are fixed to the bottom of the linear cylinders one by one by connecting rods. The set of pressure heads includes a fixed pressure head, which is rod-shaped and its top is screwed to the bottom of the connecting rod. The bottom of the fixed pressure head has a first three-way through hole, and the three ports of the first three-way through hole are respectively connected to the bottom axis of the fixed pressure head and its bottom two sides.

[0010] Preferably, a set of pressure heads includes at least one lever pressure head. The lever pressure head is connected to the connecting rod via a lever assembly. The lever assembly includes a connecting plate, a connecting block, a guide rod, and a swing head. The connecting rod and the guide rod are symmetrically fixed at both ends of the top of the connecting plate and pass through the upper tooling. The connecting block is fixed to the bottom of the connecting plate and coaxial with the connecting rod. The top center of the swing head is pivotally connected to the connecting block. A lever pressure head is screwed to each of the bottom ends of the swing head. The bottom of the lever pressure head has a second three-way through hole. The three ports of the second three-way through hole are respectively connected to the bottom axis of the lever pressure head and its bottom two sides. An abutment block is provided on the platform. The two lever pressure heads abut against the abutment block and the top of the product to be tested, respectively.

[0011] Preferably, the sealing head includes a side sealing head, and a bidirectional drive mechanism is provided on the upper tooling and connected to the side sealing head to drive the side sealing head to move horizontally or vertically relative to the product to be tested. The bidirectional drive mechanism includes a vertical cylinder and a horizontal cylinder. The vertical cylinder is disposed on the upper tooling, and the horizontal cylinder is fixed to the cylinder end of the vertical cylinder and driven by the vertical cylinder to move vertically relative to the lower tooling. The top of the side sealing head is fixed to the cylinder end of the horizontal cylinder and driven by the horizontal cylinder to move horizontally relative to the lower tooling.

[0012] Preferably, the sealing head includes a top sealing head, and a second vertical cylinder is provided on the upper tooling. The top sealing head is fixed below the second vertical cylinder and is driven by the second vertical cylinder to move vertically relative to the platform to dock with the product to be tested.

[0013] Preferably, a bolt detection mechanism is provided on the rear side of the upper tooling. The bolt detection mechanism includes a first push cylinder, a detection head, and a first displacement sensor. The detection head and the first detection sensor are respectively fixed to the front and rear end faces of the cylinder end of the first displacement cylinder, and are driven by the first push cylinder to move synchronously to the side of the product under test until they abut against the side of the product under test.

[0014] Preferably, a set of bushing detection sensors is provided at the bottom of the stage. The contact end of each bushing detection sensor is directly opposite a bushing position on the product to be tested. The contact end moves relative to the bushing to abut against the bushing in order to detect the presence of the bushing.

[0015] Preferably, the upper tooling is also vertically provided with a nut detection mechanism. The nut detection mechanism includes a second push cylinder, a second detection head, and a second displacement sensor. The second detection head and the second detection sensor are respectively fixed to the upper and lower end faces of the cylinder end of the second displacement cylinder, and are driven by the second push cylinder to move vertically and synchronously with the top nut of the product under test until they abut against the top of the nut.

[0016] The beneficial effects of this utility model are mainly reflected in:

[0017] 1. A platform is set up to cooperate with the horizontal and vertical positioning mechanisms to position the product under test from the horizontal and vertical directions respectively, eliminating the influence of the irregularity of the product under test on the positioning and ensuring the positional stability of the product under test in the testing process. At the same time, the ventilation mechanism is also set on the platform to allow for direct testing after the product under test is positioned, which is convenient and fast.

[0018] 2. The horizontal positioning mechanism uses a contour positioning block and a rotatable eccentric positioning block to quickly define the horizontal position of the product to be tested. The vertical positioning mechanism uses a fixed pressure head and a lever pressure head to quickly define the vertical position of the product to be tested. The combination of the two can quickly and conveniently define the position of the product to be tested.

[0019] 3. The contour positioning block can quickly align the product under test and provide some support to the top surface of the product under test, avoiding damage to the top surface of the product under test during the positioning process of the vertical positioning mechanism. At the same time, it can reduce the internal space of the product under test, thereby saving the actual filling space required in the leak detection, shortening the detection time, and improving the detection efficiency.

[0020] 4. The lever indenter uses the lever principle to press the surface of the product to be tested. The lever principle also eliminates the need for the bottom lever indenter to be coaxial with the top linear cylinder, thus solving the pressing treatment of smaller positions or parts that are not suitable for fixed indenters. At the same time, it saves space to allow other structures to be placed, making the upper and lower tooling more compact.

[0021] 5. The upper and lower fixtures integrate bolt detection mechanisms, bushing detection sensors, and nut detection mechanisms. While completing the leakage test, the stable positioning effect of the positioning mechanism is used to detect the bolts, bushings, and nuts on the product under test at the same time. This realizes the multi-functional purpose of the leakage detection device, simplifies the structure required for multiple detection links, reduces detection costs, saves positioning steps in each detection link, and improves detection efficiency. Attached Figure Description

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0023] Figure 1 : Schematic diagram of an embodiment of this utility model;

[0024] Figure 2 : Another schematic diagram of an embodiment of this utility model;

[0025] Figure 3 : A schematic diagram of the lower tooling in this embodiment of the present invention;

[0026] Figure 4 : A partial sectional view of the lower tooling in this embodiment of the present invention;

[0027] Figure 5 : A schematic diagram of the fixed pressure head in an embodiment of this utility model;

[0028] Figure 6 : Schematic diagram of the lever pressure head in the embodiment of this utility model. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0030] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0031] like Figures 1 to 6 As shown, this utility model discloses an engine hood leakage testing device, including an upper fixture 1 and a lower fixture 2 arranged opposite each other. The device is characterized by: a positioning mechanism and a ventilation mechanism being provided between the upper fixture 1 and the lower fixture 2; a platform 201 for placing the product to be tested being provided on the lower fixture 2; the positioning mechanism including a horizontal positioning mechanism disposed on the platform 201 and a vertical positioning mechanism disposed on the upper fixture 1; the horizontal positioning mechanism matching the side of the product to be tested; and the bottom of the vertical positioning mechanism matching the top surface of the product to be tested. The horizontal positioning mechanism and the vertical positioning mechanism respectively constrain the product under test onto the platform 201 from the horizontal and vertical directions; the ventilation mechanism includes an on / off valve 501, a connection port 502, and a sealing head. A set of the sealing heads is movably disposed on the upper tooling 1 to seal the port of the product under test. The on / off valve 501 is disposed on one side of the platform 201, and a set of the connection ports 502 is disposed on the platform 201. The on / off valve 501 is connected to the interior of the product under test through the set of connection ports 502 to perform leakage testing.

[0032] This solution uses the platform 201 to work with the horizontal and vertical positioning mechanisms to position the product under test in the horizontal and vertical directions respectively, eliminating the influence of the irregularity of the product under test on the positioning and ensuring the positional stability of the product under test during the testing process. At the same time, the ventilation mechanism is also set on the platform 201 to allow for direct testing after the product under test is positioned, which is convenient and quick.

[0033] Specifically, the horizontal positioning mechanism includes a set of eccentric positioning blocks 302 rotatably mounted on the platform 201 along the side of the product to be tested. This allows the eccentric positioning blocks 302 to adapt to the side position of the product to be tested, thus achieving a positioning function. A set of positioning shafts is provided on the platform 201 along the side of the product to be tested. Each eccentric positioning block 302 has a central through hole 3021 that is not coaxial with its axis. The positioning shafts pass through the central through hole 3021, allowing the eccentric positioning blocks 302 to rotate eccentrically. This eccentric rotation causes the eccentric positioning blocks 302 to fit tightly against the side of the product to be tested, clamping the product and defining its horizontal position. This structure allows the eccentric positioning blocks 302 to have a certain adjustment range to adapt to products of different shapes and sizes, rather than being limited to a single specified size, thereby improving the flexibility of the horizontal positioning mechanism.

[0034] Furthermore, the horizontal positioning mechanism also includes a contour-following fixing block 303 fixed on the platform 201. The outer contour of the contour-following fixing block 303 matches the inner contour of the product under test, so that the product under test covers the contour-following fixing block 303. The product under test is a hollow cover. The contour-following positioning block 303 can quickly align the product under test and also provide some support for the top surface of the product under test, preventing damage to the top surface of the product under test during the positioning process of the vertical positioning mechanism. At the same time, it can reduce the internal space of the product under test, thereby saving the space actually needed for filling during leak detection, shortening the detection time, and improving detection efficiency.

[0035] A photoelectric sensor 304 is respectively arranged at two opposite corners of the platform 201 to detect whether the product to be tested is placed or not.

[0036] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the vertical positioning mechanism is located above the platform 201. The vertical positioning mechanism includes a set of linear cylinders 401 and pressure heads fixed to the bottom of each linear cylinder 401 via connecting rods 402. One of the pressure heads is a fixed pressure head 403, which is rod-shaped and its top is screwed to the bottom of the connecting rod to facilitate replacement and installation. The bottom of the fixed pressure head 403 has a first three-way through hole 404, whose three ports connect to the bottom axis of the fixed pressure head 403 and its two bottom sides, respectively. The first three-way through hole 404 prevents the fixed pressure head 403 from pressing tightly against the surface of the product being tested, thus facilitating the upward movement and resetting of the fixed pressure head 403 and preventing excessive adsorption of the product being tested.

[0037] The pressure head in this solution is not limited to the conventional fixed pressure head 403, such as... Figure 5 As shown, a set of pressure heads includes at least one lever pressure head 410. The lever pressure head 410 is connected to the connecting rod 402 via a lever assembly. The lever assembly includes a connecting plate 405, a connecting block 406, a guide rod 407, and a swing head 408. The connecting rod 402 and the guide rod 407 are symmetrically fixed at both ends of the top of the connecting plate 405 and respectively pass through the upper tooling 1. The connecting block 406 is fixed to the bottom of the connecting plate 405 and coaxial with the connecting rod 402. The top center of the swing head 408 is pivotally connected to the connecting block 406. A lever pressure head 410 is screwed to each of the two bottom ends of the swing head 408. The bottom of the lever pressure head 410 has a second three-way through hole 409. The three ports of the second three-way through hole 409 connect to the bottom axis of the lever pressure head 410 and its two bottom sides, respectively. A contact block 202 is provided on the platform 201. The two lever pressure heads 410 respectively abut against the contact block 202 and the top of the product to be tested. The principle of the second three-way through hole 409 is the same as that of the first three-way through hole 404, and will not be elaborated here. The lever head 410 uses the lever principle to press the surface of the product to be tested. The lever principle also allows the bottom lever head 410 to be coaxial with the top linear cylinder 401, which solves the pressing treatment of smaller positions or parts that are not compatible with the fixed head 403, and saves space to allow other structures to be placed, making the upper tooling 1 and the lower tooling 2 more compactly matched.

[0038] like Figure 1 As shown, the sealing head includes a side sealing head 503. A bidirectional drive mechanism is provided on the upper tooling 1 and connected to the side sealing head 503 to drive the side sealing head 503 to move horizontally or vertically relative to the product to be tested. The bidirectional drive mechanism includes a vertical cylinder 505 and a horizontal cylinder 506. The vertical cylinder 505 is provided on the upper tooling 1. The horizontal cylinder 506 is fixed to the cylinder end of the vertical cylinder 505 and is driven by the vertical cylinder 505 to move vertically relative to the lower tooling 2. The top of the side sealing head 503 is fixed to the cylinder end of the horizontal cylinder 506 and is driven by the horizontal cylinder 506 to move horizontally relative to the lower tooling 2.

[0039] Furthermore, the sealing head includes a top sealing head 504, and a second vertical cylinder 507 is provided on the upper tooling 1. The top sealing head 504 is fixed below the second vertical cylinder 507 and is driven by the second vertical cylinder 507 to move vertically relative to the platform 201 to dock with the product to be tested.

[0040] The side sealing head 503 mates with the side port of the product under test to seal its side port. Similarly, the top sealing head 504 mates with the top port of the product under test to seal its top port. Both the side sealing head 503 and the top sealing head 504 have internal structures including diaphragm cylinders and sealing rings. When the side sealing head 503 and the top sealing head 504 are mated with the port of the product under test, the diaphragm cylinders press against the sealing rings to seal the connection between the side sealing head 503 / top sealing head 504 and the port of the product under test, thus forming an effective seal. This is prior art and not the focus of this solution, so it will not be elaborated upon here.

[0041] Herein, a bolt detection mechanism is provided on the rear side of the upper tooling 1. The bolt detection mechanism includes a first push cylinder 601, a detection head 602, and a first displacement sensor 603. The detection head 602 and the first detection sensor 603 are respectively fixed to the front and rear end faces of the cylinder end of the first displacement cylinder 601, and are driven by the first push cylinder 601 to move synchronously to the side of the product under test until they abut against the side of the product under test. Some bolts are provided on the rear side of the product under test. The detection head 602 is a solid block adapted to the bolts. The bolt detection mechanism uses the first displacement sensor 603 to detect the comparison between the stroke generated when the detection head 602 abuts against the outer end of the bolt and the predetermined stroke to determine whether a bolt is installed or whether the bolt is installed in place.

[0042] Similarly, a set of bushing detection sensors 7 are provided at the bottom of the stage 201. The contact end 701 of each bushing detection sensor 7 is directly opposite a bushing position on the product to be tested. The contact end 701 moves relative to the bushing to abut against the bushing in order to detect the presence of the bushing.

[0043] The upper tooling 1 is also vertically equipped with a nut detection mechanism. The nut detection mechanism includes a second push cylinder 801, a second detection head 802, and a second displacement sensor 803. The second detection head 802 and the second detection sensor 803 are respectively fixed to the upper and lower end faces of the cylinder end of the second displacement cylinder 801, and are driven by the second push cylinder 801 to move vertically and synchronously with the top nut of the product under test until they abut against the top of the nut.

[0044] The bolt detection mechanism, bushing detection sensor, and nut detection mechanism all require the product under test to be inspected while it is in a positioned state. The upper fixture 1 and lower fixture 2 integrate these mechanisms, allowing for simultaneous or post-leakage testing of the product under test, utilizing the stable positioning effect of the positioning mechanism to inspect the bolts, bushings, and nuts. This achieves a multi-functional leak detection device, simplifies the structure required for multiple inspection stages, reduces inspection costs, saves positioning steps in each inspection stage, and improves inspection efficiency. The positions of the bolt detection mechanism, bushing detection sensor, and nut detection mechanism are determined based on the specific parts of the product under test to be inspected; this solution does not impose any limitations.

[0045] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. An engine cover leakage testing device, comprising an upper fixture (1) and a lower fixture (2) arranged opposite each other, characterized in that: A positioning mechanism and a ventilation mechanism are provided between the upper fixture (1) and the lower fixture (2). A platform (201) for placing the product to be tested is provided on the lower fixture (2). The positioning mechanism includes a horizontal positioning mechanism on the platform (201) and a vertical positioning mechanism on the upper fixture (1). The horizontal positioning mechanism matches the side of the product to be tested, and the bottom of the vertical positioning mechanism matches the top surface of the product to be tested. The horizontal and vertical positioning mechanisms respectively position the product from the horizontal and vertical directions. The product under test is confined on the platform (201); the ventilation mechanism includes an on / off valve (501), a connection port (502), and a sealing head. A set of the sealing heads is movably disposed on the upper tooling (1) to seal the port of the product under test. The on / off valve (501) is disposed on one side of the platform (201), and a set of the connection ports (502) is disposed on the platform (201). The on / off valve (501) is connected to the interior of the product under test through a set of the connection ports (502) to perform a leak test.

2. The engine cover leakage testing device according to claim 1, characterized in that: The horizontal positioning mechanism includes a set of eccentric positioning blocks (302) rotatably disposed on the platform (201) along the side of the product to be tested. A set of positioning shafts is disposed on the platform (201) along the side of the product to be tested. A central through hole (3021) is disposed in the eccentric positioning block (302) and is not coaxial with its axis. The positioning shaft passes through the central through hole (3021) to make the eccentric positioning block (302) rotate eccentrically. The set of eccentric positioning blocks (302) clamps the product to be tested by tightly fitting the side of the product to be tested through eccentric rotation, thereby limiting the horizontal position of the product to be tested.

3. The engine cover leakage testing device according to claim 2, characterized in that: The horizontal positioning mechanism also includes a contouring fixing block (303) fixed on the platform (201). The outer contour of the contouring fixing block (303) matches the inner contour of the product to be tested, so that the product to be tested is placed on the contouring fixing block (303). A photoelectric sensor (304) is respectively arranged on two opposite corners of the platform (201) to detect the placement of the product to be tested.

4. The engine cover leakage testing device according to claim 3, characterized in that: The vertical positioning mechanism is located above the platform (201). The vertical positioning mechanism includes a set of linear cylinders (401) and pressure heads that are fixed to the bottom of the linear cylinders (401) one by one through connecting rods (402). The set of pressure heads includes a fixed pressure head (403). The fixed pressure head (403) is rod-shaped, and its top is screwed to the bottom of the connecting rod. The bottom of the fixed pressure head (403) has a first three-way through hole (404). The three ports of the first three-way through hole (404) are respectively connected to the bottom axis of the fixed pressure head (403) and its bottom two sides.

5. The engine cover leakage testing device according to claim 4, characterized in that: A set of pressure heads includes at least one lever pressure head (410), which is connected to the connecting rod (402) via a lever assembly. The lever assembly includes a connecting plate (405), a connecting block (406), a guide rod (407), and a swing head (408). The connecting rod (402) and the guide rod (407) are symmetrically fixed at both ends of the top of the connecting plate (405) and respectively pass through the upper tooling (1). The connecting block (406) is fixed to the bottom of the connecting plate (405) and coaxial with the connecting rod (402). The top center of the swing head (408) is pivotally connected to the connecting block (406). A lever pressure head (410) is screwed to each of the two bottom ends of the swing head (408). The bottom of the lever pressure head (410) has a second three-way through hole (409). The three ports of the second three-way through hole (409) are respectively connected to the bottom axis of the lever pressure head (410) and its bottom two sides. An abutment block (202) is provided on the platform (201). The two lever pressure heads (410) abut against the abutment block (202) and the top of the product to be tested, respectively.

6. The engine cover leakage testing device according to any one of claims 1-5, characterized in that: The sealing head includes a side sealing head (503). A bidirectional drive mechanism is provided on the upper tooling (1) and connected to the side sealing head (503) to drive the side sealing head (503) to move horizontally or vertically relative to the product to be tested. The bidirectional drive mechanism includes a vertical cylinder (505) and a horizontal cylinder (506). The vertical cylinder (505) is provided on the upper tooling (1). The horizontal cylinder (506) is fixed to the cylinder end of the vertical cylinder (505) and is driven by the vertical cylinder (505) to move vertically relative to the lower tooling (2). The top of the side sealing head (503) is fixed to the cylinder end of the horizontal cylinder (506) and is driven by the horizontal cylinder (506) to move horizontally relative to the lower tooling (2).

7. The engine cover leakage testing device according to claim 6, characterized in that: The sealing head includes a top sealing head (504), and a second vertical cylinder (507) is provided on the upper tooling (1). The top sealing head (504) is fixed below the second vertical cylinder (507) and is driven by the second vertical cylinder (507) to move vertically relative to the platform (201) to dock with the product to be tested.

8. The engine cover leakage testing device according to claim 7, characterized in that: A bolt detection mechanism is provided on the rear side of the upper tooling (1). The bolt detection mechanism includes a first push cylinder (601), a detection head (602), and a first displacement sensor (603). The detection head (602) and the first displacement sensor (603) are respectively fixed to the front and rear end faces of the cylinder end of the first push cylinder (601), and are driven by the first push cylinder (601) to move synchronously to the side of the product under test until they abut against the side of the product under test.

9. The engine cover leakage testing device according to claim 8, characterized in that: A set of bushing detection sensors (7) is provided at the bottom of the stage (201). The contact end (701) of each bushing detection sensor (7) is directly opposite to a bushing position on the product to be tested. The contact end (701) moves relative to the bushing to abut against the bushing in order to detect the presence of the bushing.

10. The engine cover leakage testing device according to claim 9, characterized in that: The upper tooling (1) is also vertically provided with a nut detection mechanism. The nut detection mechanism includes a second push cylinder (801), a second detection head (802), and a second displacement sensor (803). The second detection head (802) and the second displacement sensor (803) are respectively fixed to the upper and lower end faces of the cylinder end of the second push cylinder (801), and are driven by the second push cylinder (801) to move vertically in sync with the top nut of the product under test until they abut against the top of the nut.

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