Clamp for detecting air tightness of product

Abstract

A clamp for detecting air tightness of a product comprises a lower clamp, an upper clamp and an air inlet mechanism, and is characterized in that the upper surface of the lower clamp is provided with a sealing seat corresponding to a cavity to be detected, and the upper clamp is provided with a first plugging piece capable of plugging a first opening; a triggering piece capable of being triggered by the first plugging piece, a transmission mechanism and a second plugging piece linked with the transmission mechanism are arranged in the sealing seat, and under the state that the first plugging piece enters the first opening, the triggering piece triggers the transmission mechanism and drives the second plugging piece to extend outwards relative to the sealing seat; therefore, the second opening is blocked, so that the to-be-detected cavity forms an independent closed space. The sealing seat not only can seal the space of the to-be-detected cavity to make the sealing performance of the to-be-detected cavity better, but also can save the space for installing the touch piece, the transmission mechanism and the second plugging piece in the to-be-detected cavity to improve the space utilization rate in the to-be-detected cavity, so that the operation of installing and detecting the to-be-detected object is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts detection, in particular to a clamp for detecting the air tightness of a product. Background Art

[0002] The motor housing is an important component of automobile parts, and it needs to be tested for air tightness after it is produced. For example, the Chinese utility model "Motor housing leak detection tool with water nozzle" with patent number ZL202223264635.1 (authorization announcement number CN218955995U) discloses a fixture for detecting the air tightness of the motor housing. The leak detection tool installs the top plate in the upper mold to lift it. Before the motor housing to be tested is installed, the top plate is in a raised state, and the motor housing is sealed by the filling block and installed on the bottom plate. Then, the top plate is driven down by the upper mold, and multiple pressure rods press the edge of the motor housing, and the plug, driven by the cylinder, will seal the hole on the cavity to be tested in the motor housing, and finally ventilate the cavity to be tested, so as to detect whether the air tightness of the cavity to be tested is qualified.

[0003] Although the above-mentioned fixture for testing the air tightness of the motor housing can seal the holes on the motor housing by means of the filling block and the plug, if the motor housing to be tested is Figure 1 As shown, the cavity of the motor housing 1' is divided into a plurality of test cavities 12' by a baffle 11', wherein one of the test cavities 12' has two openings, one of which is a through hole 13' connected to the outside, and the other is an oil hole 14' arranged on the inner wall of the motor housing 1'. The oil hole 14' is not connected to the outside, and the through hole 13' can be blocked by a plug of a leak detection tool, while the oil hole 14' on the inner wall needs to be blocked by a plugging member arranged in the test cavity 12', and the structure of the plugging member needs to match the shape and position of the oil hole 14'; however, as Figure 1 As shown, the inner wall structure of the motor housing 1' is complex, and the inner wall around the oil hole 14' is blocked by a baffle 11'. Therefore, a sealing member of a specific shape is required to seal the oil hole 14', such as a sealing rod body; however, if a sealing rod body is used to seal the oil hole 14', then during the installation of the motor housing 1', the sealing rod body may be stuck on the inner wall of the motor housing 1', thereby failing to seal the oil hole 14' and failing to install the motor housing 1' in the fixture, and further improvements are needed for this. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a fixture for detecting the air tightness of products in view of the above-mentioned existing technical status, especially for detecting a cavity to be tested in which one opening is not connected to the outside.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: the fixture for detecting the air tightness of the product includes:

[0006] A lower fixture is used to carry an object to be detected, wherein the object to be detected includes a cavity facing the lower fixture, a cavity to be detected is provided in the cavity, a first opening penetrating the cavity to be detected is provided on the object to be detected, and a second opening communicating with the cavity to be detected is provided in the cavity;

[0007] An upper clamp, used to press the object to be detected; and

[0008] An air intake mechanism, arranged on the upper fixture and / or the lower fixture, for supplying air to the cavity to be tested of the object to be tested;

[0009] Features:

[0010] A sealing seat corresponding to the cavity to be tested is provided on the upper surface of the lower clamp, and a first sealing member capable of sealing the first opening is provided on the upper clamp, and a triggering member that can be triggered by the first sealing member, a transmission mechanism, and a second sealing member linked to the transmission mechanism are provided in the sealing seat. When the first sealing member enters the first opening, the transmission mechanism is triggered by the triggering member and the second sealing member is driven to extend outward relative to the sealing seat, thereby sealing the second opening so that the cavity to be tested forms an independent enclosed space.

[0011] In order to enable the transmission mechanism to drive the second blocking member to extend outward relative to the sealing seat, preferably, the transmission mechanism can convert the downward force of the first blocking member when entering the first opening into causing the second blocking member to contract inward and outward relative to the sealing seat. The downward force of the first blocking member when entering the first opening will trigger the trigger member, and the trigger member will then trigger the transmission mechanism, so that the transmission mechanism drives the second blocking member to contract inward and outward relative to the sealing seat. Therefore, when the fixture is installed with the object to be tested, the second blocking member contracts relative to the sealing seat and will not hinder the object to be tested from being installed on the lower fixture; when the fixture needs to perform an airtightness test on the cavity to be tested, the first opening is blocked by the first blocking member, and the first blocking member triggers the transmission mechanism with the help of the trigger member to drive the second sealing member to extend outward relative to the sealing seat, thereby blocking the second opening connected to the cavity to be tested.

[0012] In order to control the direction of the second blocking member's inward and outward contraction, preferably, a guide seat for controlling the inward and outward contraction direction of the second blocking member is further provided in the sealing seat, and a guide hole is provided on the guide seat for the second blocking member to pass through, and the second blocking member can contract inward and outward relative to the sealing seat in the guide hole, and the outwardly extending second blocking member blocks the second opening by being restricted by the guide hole. The guide hole is parallel to the second opening, so that the second blocking member can block the second opening.

[0013] In order to enable the transmission mechanism to convert the downward force into causing the second blocking member to contract inwardly and outwardly relative to the sealing seat, preferably, the transmission mechanism further comprises:

[0014] A mounting seat is mounted in the sealing seat, a mounting hole is provided at the top of the mounting seat, the trigger is mounted in the mounting hole, and when the first blocking member enters the first opening, the first blocking member can trigger the trigger to move downward in the mounting hole;

[0015] an elastic member, sleeved on the second sealing member, so that the second sealing member is retracted relative to the sealing seat;

[0016] A connecting member is hinged to the mounting seat by a pin shaft, and the connecting member includes a first branch and a second branch, the first branch is arranged below the trigger member, the first branch is an end extending in a horizontal direction, and the second branch is an end extending in an oblique downward direction, the second branch is in contact with the second blocking member, and the downward movement of the trigger member can apply a downward force to the first branch, and the connecting member rotates in the mounting seat, so that the second branch pushes the second blocking member to move in the guide hole, so that the second blocking member extends outward relative to the sealing seat to block the second opening.

[0017] As a solution for the second opening, preferably, the second opening is an inclined hole arranged in the mold cavity, the guide seat is provided with an inclined connecting portion, the guide hole is arranged on the connecting portion, and the second blocking member can shrink inside and outside relative to the sealing seat in the guide hole, thereby blocking the inclined second opening. If the second opening is an inclined hole, in order to achieve a better sealing effect of the second blocking member, the second blocking member also needs to be inclined and can shrink inside and outside relative to the sealing seat, so the guide hole is arranged on the inclined connecting portion.

[0018] Furthermore, the elastic member is a spring, one end of which abuts against the connecting portion, and the other end of which abuts against the second blocking member. When the second blocking member needs to be reset after blocking, the deformation of the spring is used to reset the second blocking member, thereby resetting the transmission mechanism and the trigger member.

[0019] In order to make the first blocking piece adapt to the position error of the first opening on different products, preferably, a first cylinder for driving the vertical movement of the first blocking piece is provided above the first blocking piece, and a connecting rod is provided above the first cylinder, and the connecting rod is connected to the upper clamp through a sliding device, and the sliding device can drive the first cylinder and the first blocking piece to move horizontally through the connecting rod. When the sliding device drives the first cylinder and the first blocking piece to move above the first opening of the product, the sliding device completes the work.

[0020] Further, the sliding device includes a sliding mechanism and a driving mechanism, the sliding mechanism includes a guide rail fixedly mounted on the upper clamp and a slider mounted on the guide rail, a fixing plate is fixedly mounted on the upper end of the connecting rod, the fixing plate is fixedly connected to the slider, and the fixing plate is fixedly connected to the output end of the driving mechanism, and the driving mechanism can drive the fixing plate to move laterally along the guide rail. The sliding device drives the fixing plate to move laterally along the guide rail through the driving mechanism, so that the first cylinder and the first blocking member can move laterally to above the first opening of the product.

[0021] Furthermore, the driving mechanism includes an L-shaped connecting plate and a second cylinder, one end of the connecting plate is mounted on the upper clamp, the other end of the connecting plate is fixedly connected to the second cylinder, and the output end of the second cylinder is fixedly connected to the fixing plate.

[0022] In order to limit the range of lateral movement of the first blocking member, preferably, a limiting member is further provided on the upper clamp, a limiting block is provided on the side of the fixing plate away from the driving mechanism, and a limiting groove is provided on the limiting member for inserting the limiting block, and when the driving mechanism drives the connecting rod to move laterally to the end of the guide rail away from the driving mechanism, the limiting block is inserted into the limiting groove. The cooperation between the limiting block and the limiting groove enables the fixing plate to move stably on the guide rail without falling off the guide rail.

[0023] Compared with the prior art, the advantages of the utility model are: a sealing seat is provided on the upper surface of the lower fixture, and the sealing seat has a dual purpose. First, the sealing seat is arranged in the cavity to be tested, so that the cavity to be tested can form an independent closed space; second, a trigger, a transmission mechanism and a second blocking member are also provided in the sealing seat, so that the sealing seat can not only block the second opening connected to the cavity to be tested, but also can not hinder the object to be tested from being installed on the lower fixture. Therefore, the sealing seat can not only seal the space of the cavity to be tested, so that the sealing performance of the cavity to be tested is better, but also save the space for installing the trigger, the transmission mechanism and the second blocking member in the cavity to be tested, so that the space utilization rate in the cavity to be tested is improved, so that the operation of installing and detecting the object to be tested is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a motor housing in the background technology;

[0025] Figure 2 This is a schematic diagram of the structure of the object to be detected in the embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of an embodiment of the utility model;

[0027] Figure 4 A cross-sectional view of an embodiment of the utility model;

[0028] Figure 5 The structure diagram of the embodiment of the utility model is shown in FIG. 1 (the object to be detected is omitted);

[0029] Figure 6 It is a structural schematic diagram of the first blocking member, the trigger member, the transmission mechanism, the second blocking member and the guide seat in the embodiment of the utility model;

[0030] Figure 7 It is an exploded schematic diagram of the trigger, the transmission mechanism, the second blocking member and the guide seat in the embodiment of the utility model;

[0031] Figure 8 It is a schematic diagram of the structure of the upper clamp, the sliding device, the connecting rod and the first cylinder in the embodiment of the utility model;

[0032] Fig. 9 It is a schematic diagram of the structure of the sliding device and the connecting rod in the embodiment of the utility model. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] like Figures 2 to 9 Shown is the best embodiment of the utility model.

[0035] like Figure 2 As shown, the object to be detected 1 of this embodiment includes a cavity 11 facing the lower fixture 2, a cavity 12 to be detected is provided in the cavity 11, a first opening 13 penetrating the cavity 12 to be detected is opened on the object to be detected 1, and a second opening 14 communicating with the cavity 12 to be detected is provided in the cavity 11.

[0036] like Figures 3 to 5As shown, the fixture used to detect the air tightness of the product in this embodiment needs to seal the first opening 13 and the second opening 14 on the cavity 12 to be tested, and after forming an independent closed space, an external airtightness detector and other equipment are used to determine whether the airtightness of the cavity 12 to be tested meets the standard. Therefore, the fixture includes a lower fixture 2 for carrying the object 1 to be tested and an upper fixture 3 for pressing the object 1 to be tested. The lower fixture 2 and the upper fixture 3 cooperate to fix the object 1 to be tested in the fixture. The fixture also includes an air intake mechanism arranged on the lower fixture 2, and the air intake mechanism is used to supply air to the cavity 12 to be tested of the object 1 to be tested. Among them, the upper surface of the lower clamp 2 is provided with a sealing seat 21 corresponding to the cavity to be tested 12, the upper clamp 3 is provided with a first sealing piece 4 that can block the first opening 13, and a trigger piece 5 that can be triggered by the first sealing piece 4, a transmission mechanism 6 and a second sealing piece 7 linked with the transmission mechanism 6 are provided in the sealing seat 21; when the clamp is installed with the object to be tested 1, the second sealing piece 7 shrinks relative to the sealing seat 21 and will not hinder the object to be tested 1 from being installed on the lower clamp 2; when the clamp needs to perform an airtightness test on the cavity to be tested 12, when the first sealing piece 4 enters the first opening 13, the transmission mechanism 6 is triggered by the trigger piece 5 and the second sealing piece 7 is driven to extend relative to the sealing seat 21, thereby blocking the second opening 14 so that the cavity to be tested 12 forms an independent closed space, and the air intake mechanism ventilates the closed space to perform an airtightness test on the cavity to be tested 12.

[0037] like Figure 4 As shown, the second opening 14 is an inclined hole arranged in the cavity 11. In order to enable the second sealing member 7 to block the inclined second opening 14, a guide seat 8 for controlling the inward and outward contraction direction of the second sealing member 7 is also provided in the sealing seat 21. The guide seat 8 is provided with a guide hole 81 for the second sealing member 7 to pass through and an inclined connecting portion 82. The guide hole 81 is arranged on the connecting portion 82. The guide hole 81 is parallel to the second opening 14. The second sealing member 7 can contract inward and outward relative to the sealing seat 21 in the guide hole 81. The protruding second sealing member 7 is restricted by the guide hole 81 to block the second opening 14.

[0038] like Figure 6 and Figure 7As shown, the transmission mechanism 6 can convert the downward force of the first blocking member 4 when entering the first opening 13 into causing the second blocking member 7 to shrink inward and outward relative to the sealing seat 21. Specifically, the transmission mechanism 6 also includes: a mounting seat 61, an elastic member 62 and a connecting member 63. The mounting seat 61 is installed in the sealing seat 21. The top of the mounting seat 61 is provided with a mounting hole 611. The trigger member 5 is installed in the mounting hole 611. When the first blocking member 4 enters the first opening 13, the first blocking member 4 can trigger the trigger member 5 to move downward in the mounting hole 611. The elastic member 62 is a spring, which is sleeved on the second blocking member 7. One end of the elastic member 62 abuts against the connecting portion 82, and the other end of the elastic member 62 abuts against the second blocking member 7, causing the second blocking member 7 to shrink inward relative to the sealing seat 21. The connecting member 63 is connected to the second sealing member 7 through a pin. 64 is hinged to the mounting seat 61, and the connecting member 63 includes a first branch 631 and a second branch 632. The first branch 631 is arranged below the trigger member 5, the first branch 631 is an end extending in the horizontal direction, and the second branch 632 is an end extending in the oblique downward direction. The second branch 632 is in contact with the second blocking member 7. The downward movement of the trigger member 5 can apply a downward force to the first branch 631, and the connecting member 63 rotates in the mounting seat 61, so that the second branch 632 pushes the second blocking member 7 to move in the guide hole 81, so that the second blocking member 7 extends relative to the sealing seat 21 to block the second opening 14.

[0039] like Figure 8 and Fig. 9As shown, in order to enable the first blocking member 4 to adapt to the error of the position of the first opening 13 on different objects 1 to be detected, a first cylinder 41 for driving its vertical movement is provided above the first blocking member 4, and a connecting rod 42 is provided above the first cylinder 41. The connecting rod 42 is connected to the upper clamp 3 through a sliding device 9, and the sliding device 9 can drive the first cylinder 41 and the first blocking member 4 to move horizontally through the connecting rod 42. Among them, the sliding device 9 includes a sliding mechanism 91 and a driving mechanism 92, the sliding mechanism 91 includes a guide rail 911 fixedly installed on the upper clamp 3 and a slider 912 installed on the guide rail 911, the upper end of the connecting rod 42 is fixedly installed with a fixing plate 43, the fixing plate 43 is fixedly connected to the slider 912, and the fixing plate 43 is fixedly connected to the output end of the driving mechanism 92, and the driving mechanism 92 can drive the fixing plate 43 to move laterally along the guide rail 911; the driving mechanism 92 includes an L-shaped connecting plate 921 and a second cylinder 922, one end of the connecting plate 921 is installed on the upper clamp 3, the other end of the connecting plate 921 is fixedly connected to the second cylinder 922, and the output end of the second cylinder 922 is fixedly connected to the fixing plate 43. In addition, in order to limit the range of lateral movement of the first blocking member 4, a limit member 31 is further provided on the bottom surface of the upper clamp 3, and a limit block 44 is provided on the side of the fixed plate 43 away from the driving mechanism 92. A limit groove 311 is provided on the limit member 31 for inserting the limit block 44. When the driving mechanism 92 drives the connecting rod 42 to move laterally to the end of the guide rail 911 away from the driving mechanism 92, the limit block 44 is inserted into the limit groove 311.

[0040] The working process of this embodiment is as follows: the upper fixture 3 in this embodiment is installed in the upper mold so that it can be lifted. Before the fixture is installed with the object 1 to be detected, the upper fixture 3 is in a raised state, and the second blocking member 7 is in a retracted state relative to the sealing seat 21; then the object 1 to be detected is installed on the sealing seat 21 of the lower fixture 2, so that the sealing seat 21 is installed in the cavity 11 of the object 1 to be detected; after the installation is completed, the upper fixture 3 is lowered, and the upper fixture 3 cooperates with the lower fixture 2 to fix the object 1 to be detected in the fixture; then the second cylinder 922 of the driving mechanism 92 is started, and the second cylinder 922 drives the fixing plate 43 to move laterally along the guide rail 911, and when the connecting rod 42 and the first When a blocking member 4 moves to the top of the first opening 13, the second cylinder 922 stops working; then the first cylinder 41 starts, and the first cylinder 41 drives the first blocking member 4 to move downward, and the first blocking member 4 enters and blocks the first opening 13. At the same time, the downward movement of the first blocking member 4 will trigger the trigger member 5. The downward movement of the trigger member 5 applies a downward force to the first branch 631, so that the connecting member 63 rotates in the mounting seat 61, and the second branch 632 pushes the second blocking member 7 to move in the guide hole 81 of the guide seat 8, so that the second blocking member 7 blocks the second opening 14; finally, ventilation is performed into the cavity 12 to be tested through the air intake mechanism to determine whether the sealing of the cavity 12 to be tested meets the standard.

Claims

1. A fixture for detecting the air tightness of a product, comprising: A lower fixture (2) is used to carry an object to be detected (1), wherein the object to be detected (1) comprises a cavity (11) facing the lower fixture (2), a cavity to be detected (12) is provided in the cavity (11), a first opening (13) penetrating the cavity to be detected (12) is provided on the object to be detected (1), and a second opening (14) communicating with the cavity to be detected (12) is provided in the cavity (11); An upper clamp (3) for pressing the object to be detected (1); and An air intake mechanism, arranged on the upper fixture (3) and / or the lower fixture (2), and used for supplying air to the cavity (12) to be tested of the object (1) to be tested; Features: The upper surface of the lower clamp (2) is provided with a sealing seat (21) corresponding to the cavity (12) to be tested, and the upper clamp (3) is provided with a first sealing member (4) capable of sealing the first opening (13), and a trigger member (5) capable of being triggered by the first sealing member (4), a transmission mechanism (6) and a second sealing member (7) linked to the transmission mechanism (6) are provided in the sealing seat (21). When the first sealing member (4) enters the first opening (13), the transmission mechanism (6) is triggered by the trigger member (5) and the second sealing member (7) is driven to extend outward relative to the sealing seat (21), thereby blocking the second opening (14) so ​​that the cavity (12) to be tested forms an independent closed space.

2. The fixture for detecting air tightness of a product according to claim 1, characterized in that: The transmission mechanism (6) can convert the downward force of the first blocking member (4) when entering the first opening (13) into causing the second blocking member (7) to contract inwards and outwards relative to the sealing seat (21).

3. The fixture for detecting air tightness of a product according to claim 2, characterized in that: A guide seat (8) for controlling the inward and outward contraction direction of the second sealing member (7) is also provided in the sealing seat (21); a guide hole (81) for the second sealing member (7) to pass through is provided on the guide seat (8); the second sealing member (7) can contract inward and outward relative to the sealing seat (21) in the guide hole (81); the second sealing member (7) extending outward is restricted by the guide hole (81) to thereby block the second opening (14).

4. The fixture for detecting air tightness of a product according to claim 3, characterized in that: The transmission mechanism (6) further comprises: A mounting seat (61) is mounted in the sealing seat (21); a mounting hole (611) is provided at the top of the mounting seat (61); the trigger (5) is mounted in the mounting hole (611); when the first blocking member (4) enters the first opening (13), the first blocking member (4) can trigger the trigger (5) to move downward in the mounting hole (611); an elastic member (62) sleeved on the second sealing member (7) so as to cause the second sealing member (7) to retract inwardly relative to the sealing seat (21); The connecting member (63) is hinged to the mounting seat (61) through a pin shaft (64). The connecting member (63) includes a first branch (631) and a second branch (632). The first branch (631) is arranged below the trigger member (5). The first branch (631) is an end portion extending in a horizontal direction, and the second branch (632) is an end portion extending in an obliquely downward direction. The second branch (632) contacts the second blocking member (7). The downward movement of the trigger member (5) can apply a downward force to the first branch (631). The connecting member (63) rotates in the mounting seat (61), so that the second branch (632) pushes the second blocking member (7) to move in the guide hole (81), so that the second blocking member (7) extends outward relative to the sealing seat (21) to block the second opening (14).

5. The fixture for detecting air tightness of a product according to claim 4, characterized in that: The second opening (14) is an inclined hole arranged in the mold cavity (11); the guide seat (8) is provided with an inclined connecting portion (82); the guide hole (81) is arranged on the connecting portion (82); the second sealing member (7) can shrink inward and outward relative to the sealing seat (21) in the guide hole (81), thereby sealing the inclined second opening (14).

6. The fixture for detecting air tightness of a product according to claim 5, characterized in that: The elastic member (62) is a spring, one end of the elastic member (62) abuts against the connecting portion (82), and the other end of the elastic member (62) abuts against the second blocking member (7).

7. The fixture for detecting air tightness of a product according to any one of claims 1 to 6, characterized in that: A first cylinder (41) for driving the first sealing member (4) to move vertically is provided above the first cylinder (41), and a connecting rod (42) is provided above the first cylinder (41). The connecting rod (42) is connected to the upper clamp (3) via a sliding device (9). The sliding device (9) can drive the first cylinder (41) and the first sealing member (4) to move horizontally via the connecting rod (42).

8. The fixture for detecting air tightness of a product according to claim 7, characterized in that: The sliding device (9) comprises a sliding mechanism (91) and a driving mechanism (92); the sliding mechanism (91) comprises a guide rail (911) fixedly mounted on the upper clamp (3) and a slider (912) mounted on the guide rail (911); a fixing plate (43) is fixedly mounted on the upper end of the connecting rod (42); the fixing plate (43) is fixedly connected to the slider (912), and the fixing plate (43) is fixedly connected to the output end of the driving mechanism (92); the driving mechanism (92) is capable of driving the fixing plate (43) to move laterally along the guide rail (911).

9. The fixture for detecting air tightness of a product according to claim 8, characterized in that: The driving mechanism (92) comprises an L-shaped connecting plate (921) and a second cylinder (922), one end of the connecting plate (921) is mounted on the upper clamp (3), the other end of the connecting plate (921) is fixedly connected to the second cylinder (922), and the output end of the second cylinder (922) is fixedly connected to the fixing plate (43).

10. The fixture for detecting air tightness of a product according to claim 9, characterized in that: The upper clamp (3) is also provided with a limiting member (31), a limiting block (44) is provided on a side of the fixing plate (43) away from the driving mechanism (92), and a limiting groove (311) is provided on the limiting member (31) for inserting the limiting block (44), and when the driving mechanism (92) drives the connecting rod (42) to move laterally to the end of the guide rail (911) away from the driving mechanism (92), the limiting block (44) is inserted into the limiting groove (311).

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