Device for detecting air tightness of product

Abstract

The invention discloses a device for detecting air tightness of a product, which comprises a lower clamp, an upper clamp, an air inlet hole and a plugging mechanism for plugging an oil duct, and is characterized in that the upper clamp is provided with a filling block which can be filled in a cavity to be detected, the filling block can be filled in the cavity to be detected, and a gap is reserved in the filling block when the air tightness of the cavity to be detected is detected; the external air supply mechanism only supplies air to the gap between the filling block and the to-be-detected cavity, and the gap is small, so that the air inflation speed is high and uniform, and the air tightness detection efficiency and accuracy are improved; the blocking mechanism is contained in a containing cavity defined by the C-shaped notch of the filling block, the blocking mechanism is only composed of a first blocking piece, a transmission component, a second blocking piece and a transmission rod, and the transmission component can convert vertical movement of the upper clamp into inward and outward stretching of the first blocking piece relative to the direction where the first oil hole is located; and the transmission rod can directly transmit the downward movement of the upper clamp to the second plugging piece, an additional driving source is not needed, and the occupied size is small.

Description

Technical Field

[0001] The invention relates to air tightness testing equipment for products, and in particular to a device for testing the air tightness of automobile parts. Background Art

[0002] In the production requirements of automotive parts, many parts have higher requirements for their waterproofness or airtightness. Only products that meet the corresponding requirements can be shipped. The inspection of waterproofness or airtightness can be carried out by waterproofness or airtightness inspection devices. The detection principle of both is to use air to quickly and accurately check the leakage degree of the inspection object.

[0003] In the prior art, an air tightness detection fixture for automobile parts, such as the Chinese utility model with patent number CN201420160604.8 (authorization announcement number CN203858078U), discloses an "air tightness detection device for the base of a passenger car air bag", which includes a guide column, and an upper slide and a lower slide that can move up and down along the guide column, an upper sealing seat is arranged on the bottom surface of the upper slide, and a lower sealing seat is arranged on the top surface of the lower slide, and the base of the air bag to be detected is arranged between the upper sealing seat and the lower sealing seat.

[0004] However, in actual testing, the object to be inspected sometimes involves multiple cavities to be tested, and the multiple cavities to be tested are independent of each other and have ports to be blocked to connect the two cavities. Figure 1-2 The product 1' shown in the figure includes a cavity 2' and an oil passage 3' in fluid communication with the cavity 2'. The air tightness of the oil passage 3' and the cavity 2' needs to be tested independently. The oil passage 3' has a first oil hole 31' provided on the inner wall of the cavity 2' and a second oil hole 32' provided adjacent to the first oil hole 31' and provided on the bottom wall of the cavity. When the air tightness of the cavity 2' and the oil passage 3' needs to be tested simultaneously, the first oil hole 31' and the second oil hole 32' of the cavity 2' and the oil passage 3' need to be blocked simultaneously. If the following method is used: Figure 3The plugging mechanism 4' shown in the figure is manually plugged, and the plugging mechanism 4' includes a first plugging component 41' for plugging the first oil hole 31', a second plugging component 42' for plugging the second oil hole 32', and a connecting seat 43' connecting the first plugging component 41' and the second plugging component 42', wherein the first plugging component 41' has a first plugging piece 411' for plugging the first oil hole 31' and a connecting seat 43' for the operator to operate the first plugging component 411'. The first force-applying part 412' of the blocking member 411' is used to block the first oil hole 31', the second blocking member 421' of the second blocking member 42' is used to block the second oil hole 32', and the second force-applying part 422' for the operator to control whether the second blocking member 421' blocks the second oil hole 32'. Due to the limited space in the cavity 2', in order to facilitate the operation of the operator, the first force-applying part 411' and the second force-applying part 421' are both arranged outside the cavity 2'. However, such a setting has the following problems: although the first oil hole 31' and the second oil hole 31' can be blocked, since the blocking members of the blocking mechanism 4' are arranged inside the cavity 2' and the force-applying part is arranged outside the cavity 2', the cavity 2' cannot be blocked.

[0005] If the automatic blocking method is adopted, a driving source such as a cylinder or oil cylinder that can drive the first blocking member 411' and the second blocking member 421' is required. Therefore, there needs to be a space in the cavity 2' that can accommodate the driving source. However, the space in the cavity 2' is limited, and the side wall of the cavity 2' will interfere with the setting of the driving source. At the same time, since the first oil hole 31' and the second oil hole 32' are arranged adjacent to each other, there will also be interference between the driving source that drives the first blocking member 411' and the driving source that drives the second blocking member 421'. Therefore, the existing device for detecting the airtightness of products needs to be improved. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a device for detecting the air tightness of products in view of the above-mentioned existing technical status, which can better improve the efficiency of air tightness detection, especially for products whose cavities to be tested are interconnected.

[0007] The second technical problem to be solved by the present invention is to provide a device for detecting the air tightness of a product, which can avoid interference caused by simultaneously blocking the cavity to be tested, in view of the above-mentioned existing technical status.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the device for detecting the air tightness of a product comprises:

[0009] The lower fixture is used to carry the object to be inspected, wherein the object to be inspected includes a cavity to be inspected with an opening facing upward and an oil passage provided in the wall of the cavity to be inspected, the oil passage having a first oil hole provided in the inner wall of the cavity to be inspected and a second oil hole provided in the bottom wall of the cavity to be inspected;

[0010] An upper fixture, used for pressing the object to be inspected, provided with a first sealing ring for sealing the opening of the cavity to be inspected, and the upper fixture can move up and down relative to the lower fixture; and

[0011] An air inlet hole is provided on the upper fixture and / or the lower fixture and is externally connected to an air inlet mechanism for supplying air to each position to be inspected of the object to be inspected;

[0012] The invention is characterized in that: it also includes a blocking mechanism for blocking the oil passage, the upper fixture has a filling block that can be filled in the cavity to be tested, the filling block includes a filling area that can fill the cavity to be tested with an opening facing upward and reserve a gap, and a C-shaped notch surrounded by the periphery of the filling area, the wall of the C-shaped notch surrounds a cavity for accommodating the blocking mechanism, and the blocking mechanism includes:

[0013] A first plugging member, used for plugging the first oil hole;

[0014] A transmission member is movably connected to the upper clamp, and can convert the downward movement of the upper clamp into an outward extension of the first blocking member relative to the direction of the first oil hole, so as to block the first oil hole;

[0015] A second plugging member, used for plugging the second oil hole;

[0016] A transmission rod is arranged adjacent to the transmission component and connected to the upper clamp, and can directly transmit the downward movement of the upper clamp downward to the second sealing member to seal the second oil hole; the sealing mechanism forms an independent closed space in the oil channel when the first oil hole and the second oil hole are sealed, and the air supply mechanism only supplies air to the gap, with the help of the sealing mechanism, the air tightness of the object to be inspected can be determined.

[0017] In order to convert the downward movement of the upper clamp into the outward extension of the first blocking member relative to the direction of the first oil hole, preferably, the transmission member includes:

[0018] A connecting seat, fixed at the bottom of the upper clamp and capable of moving up and down with the upper clamp, wherein the connecting seat has a hollow portion arranged along the moving direction of the upper clamp;

[0019] A first transmission member is disposed in the hollow portion, wherein the upper end of the first transmission member is movably connected to the bottom of the upper clamp and can slide in the hollow portion so that the connecting seat and the upper clamp can move up and down relative to the first transmission member;

[0020] The second transmission member, the connecting seat is provided with a first through hole for the second transmission member to extend into the connecting seat and a second through hole for the second transmission member to extend out of the connecting seat, correspondingly, the first transmission member is provided with a strip hole for the second transmission member to pass through, the second transmission member passes through the first through hole in sequence, the strip hole and the second through hole are connected to the connecting seat and the first transmission member, the strip hole extends along the moving direction of the upper clamp, the second transmission member can follow the connecting seat to move up and down along the strip hole relative to the first transmission member, and the first blocking member is arranged at one end of the second transmission member close to the first oil hole;

[0021] The action part is arranged on the first transmission member and can act on the second transmission member, and can convert the up and down movement of the second transmission member together with the first blocking member relative to the first transmission member into inward and outward expansion and contraction along the direction of the first oil hole.

[0022] The connecting seat has two functions. First, the first transmission member is arranged in the hollow part, and the hollow part forms a slideway for the first transmission member to slide in the connecting seat, limiting the sliding direction of the first transmission member. Second, the second transmission member passes through the first through hole and the second through hole of the connecting seat, and the connecting seat can transmit the up and down movement of the upper clamp to the second transmission member so that the second transmission member moves up and down accordingly; the arrangement of the strip hole enables the second transmission member to move up and down in the strip hole without transmitting the movement to the first transmission member, so that the second transmission member can move up and down relative to the first transmission member; and the arrangement of the action part converts the up and down movement of the second transmission member relative to the first transmission member into inward and outward expansion and contraction along the direction of the first oil hole, so that the first blocking member arranged on the second transmission member can block the first oil hole when the second transmission member extends outward, and retract inward to release the blocking state of the first oil hole.

[0023] In order to enable the action part to convert the up-and-down movement of the second transmission member relative to the first transmission member into an inward and outward extension along the direction of the first oil hole, preferably, the action part is a notch that is recessed inwardly on the side wall of the first transmission member, the notch faces the first oil hole, and the notch includes a transverse surface extending inwardly from the side wall of the first transmission member, a first vertical surface extending downwardly from the transverse surface, and a guiding inclined surface extending downwardly and outwardly from the bottom of the first vertical surface, and the strip hole passes through the guiding inclined surface;

[0024] The second transmission member is provided with a matching portion that matches the acting portion, and the matching portion includes a second vertical surface that matches the first vertical surface, and a matching inclined surface that is connected to the bottom of the second vertical surface and is arranged in the same direction as the guide inclined surface. The matching inclined surface is provided with a protrusion that can extend into the strip hole. With the help of the cooperation between the guide inclined surface and the matching inclined surface, the second transmission member can move along the direction of the guide inclined surface to realize the conversion of the up and down moving part of the second transmission member following the connecting seat into inward and outward extension along the direction of the first oil hole.

[0025] In the initial state, the second transmission member is located at the upper end of the strip hole, and the second vertical surface is in contact with the first vertical surface; when the upper clamp moves downward and drives the second transmission member to move downward in the strip hole relative to the first transmission member, the matching inclined surface moves obliquely downward relative to the guide inclined surface, converting the downward moving part of the second transmission member into an outward extension toward the first oil hole, so that the first blocking member blocks the first oil hole; when the upper clamp moves upward, the second transmission member shrinks away from the first oil hole, so that the first blocking member releases the blockage of the first oil hole.

[0026] In order to allow the second transmission member to retract when the upper clamp moves upward, preferably, a second elastic member and a blocking piece are provided at one end of the second transmission member away from the first oil hole, the blocking piece is limited at the end of the second transmission member by means of a nut, and the two ends of the second elastic member are respectively in contact with the side wall of the first transmission member and the blocking piece, so that the second transmission member always has a tendency to retract inward away from the direction where the first oil hole is located;

[0027] When the upper clamp moves downward relative to the first transmission member, the connecting seat drives the second transmission rod to extend outward along the guide slope in the direction of the first oil hole, and the second elastic member is compressed; when the upper clamp moves upward relative to the first transmission member, the elastic force of the compressed second elastic member pushes the second transmission rod to retract away from the direction of the first oil hole.

[0028] The arrangement of the second elastic member can make the second transmission member retract inward away from the direction of the first oil hole when the second transmission member moves upward with the upper clamp, and the matching inclined surface can always be close to the guiding inclined surface, so that the second transmission member can move obliquely upward along the guiding inclined surface to return to the initial state.

[0029] In order to flexibly connect the first transmission member to the upper clamp, preferably, a first elastic member is provided at the upper end of the first transmission member, and the upper end portion of the first transmission member is recessed to form a groove portion, and the two ends of the first elastic member are respectively abutted against the bottom of the groove portion and the upper clamp to realize the movable connection between the first transmission member and the upper clamp. When the first transmission member follows the upper clamp to move downward until the lower end of the first transmission member contacts the bottom wall of the cavity to be tested, the upper clamp can further move downward to compress the first elastic member. When the upper clamp moves upward, the first transmission member follows the upper clamp to move upward after the first elastic member is reset.

[0030] In order to prevent the lower end of the first transmission member from scratching the cavity to be tested when it contacts the bottom wall of the cavity to be tested, preferably, a flexible block for protecting the bottom wall of the cavity to be tested is provided at the lower end of the first transmission member. In this way, there is soft contact between the first transmission member and the bottom wall of the cavity to be tested, thereby preventing the first transmission member from damaging the cavity to be tested.

[0031] In order to solve the second technical problem mentioned above, preferably, the transmission rod has a third perforation coaxially arranged with the first perforation and the second perforation, and the second transmission member partially extends into the third perforation. Since the first oil hole is arranged adjacent to the second oil hole, and the second transmission member in the transmission component needs to make the first blocking member block the second oil hole by telescoping inside and outside, interference will occur between the second transmission member and the transmission rod. Therefore, a third perforation is arranged on the transmission rod so that the second transmission member can extend into the third perforation. Without affecting the transmission functions of the two, the interference of the transmission rod with the second transmission member is avoided. At the same time, since the second transmission member can extend into the third perforation, the volume occupied by the adjacent transmission rod and the transmission component is small, and they can be accommodated in the cavity surrounded by the wall of the C-shaped notch of the filling block, avoiding interference between the blocking mechanism and the cavity to be tested. In order to supply air to the oil channel, preferably, the oil channel of the object to be inspected also has a third oil hole provided on the side wall of the cavity to be tested and opening upward, the upper fixture is provided with a second sealing ring matching the third oil hole, and the air inlet hole includes a first air inlet hole provided on the upper fixture and in fluid communication with the third oil hole. The second sealing ring can seal the third oil hole when the upper fixture moves downward, and the first air inlet can supply air to the oil channel through an external air inlet mechanism, thereby detecting the air tightness of the oil channel.

[0032] In order to supply air to the cavity to be tested, preferably, the air inlet hole also includes a second air inlet hole provided in the lower fixture and in fluid communication with the cavity to be tested. The second air inlet hole is also externally connected to an air inlet mechanism, which can supply air to the cavity to be tested to detect the air tightness of the cavity to be tested.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] 1. The device for detecting the air tightness of a product is provided with a filling block on the upper fixture that can be filled in the cavity to be tested. When detecting the air tightness of the cavity to be tested, the external air supply mechanism only supplies air to the gap between the filling block and the cavity to be tested. Since the gap is small, the inflation speed is fast and uniform, thereby improving the efficiency and accuracy of air tightness detection;

[0035] 2. A sealing mechanism is also provided on the upper clamp of the device for detecting the air tightness of the product. The sealing mechanism is composed of only a first sealing piece, a transmission component, a second sealing piece and a transmission rod. The transmission component can convert the up and down movement of the upper clamp into the inward and outward extension of the first sealing piece relative to the direction of the first oil hole. The transmission rod can directly transmit the downward movement of the upper clamp downward to the second sealing piece without the need for an additional driving source. The sealing mechanism occupies a small volume and can be accommodated in the cavity surrounded by the wall of the C-shaped notch of the filling block, thereby avoiding interference between the sealing mechanism and the cavity to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a product in the background technology of the present invention;

[0037] Figure 2 for Figure 1 Sectional view at EE;

[0038] Figure 3 It is a structural schematic diagram of a blocking mechanism for manual blocking in the background technology of the present invention;

[0039] Figure 4 It is a structural schematic diagram of an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of an object to be inspected in an embodiment of the present invention;

[0041] Figure 6 for Figure 5 Cross-sectional view at FF;

[0042] Figure 7 It is a schematic diagram of the structure of an embodiment of the present invention in a blocked state;

[0043] Figure 8 for Figure 7 The enlarged view of the M in the middle;

[0044] Fig. 9 This is a schematic diagram of the structure of a filling block in an embodiment of the present invention;

[0045] Fig.10 It is a structural schematic diagram of a transmission component in an embodiment of the present invention;

[0046] Fig.11 An exploded view of a transmission component in an embodiment of the present invention;

[0047] Fig.12 An exploded view of a transmission component from another perspective in an embodiment of the present invention;

[0048] Fig.13 It is a schematic diagram of a structure in which a blocking state is released according to an embodiment of the present invention;

[0049] Fig.14 for Fig.13 Enlarged view of point N in the middle. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below with reference to the accompanying drawings.

[0051] like Figure 4-14The device for detecting the air tightness of products in this embodiment comprises a lower fixture 1 for carrying the object A to be inspected, an upper fixture 2 for pressing the object A to be inspected, and air inlet holes arranged on the upper fixture 2 and the lower fixture 1.

[0052] The object A to be inspected in this embodiment adopts the product in the background technology. Figure 5-6 The product includes a cavity B to be tested with an opening facing upward and an oil channel D arranged in the wall of the cavity B to be tested, the oil channel D has a first oil hole D1 arranged on the inner wall of the cavity B to be tested, a second oil hole D2 arranged on the bottom wall of the cavity B to be tested, a third oil hole D3 arranged on the side wall of the cavity B to be tested and opening upward, and two fourth oil holes D4 arranged on the outer wall of the cavity, wherein the second oil hole D2 is arranged adjacent to the first oil hole D1.

[0053] In order to test the air tightness of the product, it is necessary to seal the openings and oil holes of the chamber B and the oil channel D, and then supply air to the oil channel D and the chamber B to be tested, so as to independently test the air tightness of the chamber B and the oil channel D. Figure 7-8In the device of this embodiment, a first sealing ring 21 for sealing the opening of the cavity B to be tested and a second sealing ring 22 for sealing the third oil hole D3 are correspondingly provided on the upper clamp 2, and a third sealing ring 11 for blocking the bottom opening of the cavity B to be tested is correspondingly provided on the lower clamp 1. By moving the upper clamp 2 up and down relative to the lower clamp 1, the cavity B to be tested and the third oil hole D3 of the oil channel D can be blocked. The device is also provided with a plugging mechanism 5 on the upper clamp 2, and the plugging mechanism 5 includes a first plugging member 51 for plugging the first oil hole D1 and a second plugging member 52 for plugging the second oil hole D2, wherein the first plugging member 51 is connected to a transmission member 6, which is movably connected to the upper clamp 2, and can convert the downward movement of the upper clamp 2 into an extension of the first plugging member 51 relative to the direction of the first oil hole D1, so as to plug the first oil hole D1; and the second plugging member 52 is connected to a transmission rod 53, which is arranged adjacent to the transmission member 6 and connected to the upper clamp 2, and can directly transmit the downward movement of the upper clamp 2 downward to the second plugging member 52, so as to plug the second oil hole D2. In addition, the lower clamp 1 is also provided with a third plugging member 7 for plugging the fourth oil hole D4, and the third plugging member 7 is driven by a driving source 8 arranged on the lower clamp 1 to achieve the plugging of the fourth oil hole D4. Each sealing ring and plugging member plugs the corresponding openings or oil holes one by one, so that the cavity B to be tested and the oil channel D form independent closed spaces. The plugging mechanism 5 only uses the transmission member 6 to convert the up and down movement of the upper clamp 2 into the inward and outward expansion and contraction of the first plugging member 51 to plug the first oil hole D1, and uses the transmission rod 53 to directly transmit the up and down movement of the upper clamp 2 downward to the second plugging member 52 to plug the second oil hole D2. There is no need to set up an additional driving source 8 to drive the first plugging member 51 and the second plugging member 52, and it has the characteristics of small volume occupation and no interference with the cavity B to be tested. In order to independently detect the air tightness of the cavity B to be tested and the oil channel D, the air inlet holes include a first air inlet hole 41 provided on the upper clamp 2 and connected to the third oil hole D3 fluid, and a second air inlet hole 42 provided on the lower clamp 1 and connected to the cavity B to be tested fluid. The first air inlet hole 41 and the second air inlet hole 42 are respectively connected to air inlet mechanisms for supplying air to the cavity B to be tested and the oil channel D, respectively.

[0054] Since the cavity B to be tested has a certain volume of cavity, a large amount of gas needs to enter the cavity B to reach the required pressure value for air tightness testing. This process is time-consuming and requires a large amount of gas. In this embodiment, a filling block 3 that can be filled in the cavity B to be tested is provided on the upper fixture 2. Fig. 9The filling block 3 includes a filling area 31 that can fill the cavity B to be tested with the opening facing upward and reserve a gap, and a C-shaped notch 32 surrounded by the periphery of the filling area 31. The wall of the C-shaped notch 32 forms a cavity 33 for accommodating the blocking mechanism 5. The purpose of setting the filling block 3 is that when the external air supply mechanism only supplies air to the gap, the air tightness of the object A to be inspected can be determined with the help of the blocking mechanism 5. At the same time, the setting of the C-shaped notch 32 forms a cavity 33 that can accommodate the blocking mechanism 5, thereby avoiding interference between the blocking mechanism 5 and the filling block 3.

[0055] See also Figure 10-12The transmission member 6 in the blocking mechanism 5 of this embodiment includes a connecting seat 61, a first transmission member 62 and a second transmission member 63. The connecting seat 61 is fixed to the bottom of the upper clamp 2 and can move up and down with the upper clamp 2. The connecting seat 61 has a hollow portion 611 arranged along the moving direction of the upper clamp 2. The first transmission member 62 is arranged in the hollow portion 611. The upper end of the first transmission member 62 is provided with a first elastic member 67. The upper end of the first transmission member 62 is concave to form a groove portion 622. The two ends of the first elastic member 67 are respectively in contact with the bottom of the groove portion 622 and the upper clamp 2, so as to flexibly connect the first transmission member 62 to the upper clamp 2, and can slide in the hollow portion 611 so that the connecting seat 61 and the upper clamp 2 can move up and down relative to the first transmission member 62. The connecting seat 61 is also provided with a first through hole 612 for the second transmission member 63 to extend into the connecting seat 61 and a second through hole 613 for the second transmission member 63 to extend out of the connecting seat 61. The first transmission member 62 is provided with a strip hole 621 for the second transmission member 63 to pass through. The second transmission member 63 passes through the first through hole 612 in sequence. The strip hole 621 and the second through hole 613 are connected to the connecting seat 61 and the first transmission member 62. The strip hole 621 extends along the moving direction of the upper clamp 2. The second transmission member 63 can follow the connecting seat 61 and move up and down along the strip hole 621 relative to the first transmission member 62. The first blocking member 51 is provided at one end of the second transmission member 63 close to the first oil hole D1. The first transmission member 62 is provided with an acting portion 64 acting on the second transmission member 63. The acting portion 64 can convert the up and down moving portion of the second transmission member 63 together with the first blocking member 51 relative to the first transmission member 62 into an inward and outward extension along the direction of the first oil hole D1. Specifically, the action portion 64 is a notch that is recessed inwardly on the side wall of the first transmission member 62, and the notch faces the first oil hole D1. The notch includes a transverse surface 64a extending inwardly from the side wall of the first transmission member 62, a first vertical surface 64b extending downwardly from the transverse surface 64a, and a guiding inclined surface 64c extending downwardly and outwardly from the bottom of the first vertical surface 64b, and the strip hole 621 passes through the guiding inclined surface 64c; and the second transmission member 63 is provided with a matching portion 65 that matches the action portion 64, the matching portion 65 includes a second vertical surface 65a that matches the first vertical surface 64b, and a matching inclined surface 65b that is connected to the bottom of the second vertical surface 65a and is arranged in the same direction as the guiding inclined surface 64c, and the matching inclined surface 65b is provided with a protrusion 65c that can extend into the strip hole 621, and with the help of the matching of the guiding inclined surface 64c and the matching inclined surface 65b, the second transmission member 63 can move along the direction of the guiding inclined surface 64c.When the upper clamp 2 moves downward, the transmission member 6 moves downward with the upper clamp 2. When the first transmission member 62 contacts the bottom wall of the cavity B to be tested, the first transmission member 62 stops moving, and the upper clamp 2 moves further downward to compress the first elastic member 67. Under the transmission of the connecting seat 61, the second transmission rod 53 also moves further downward, and slides relatively between the matching inclined surface 65b and the guide inclined surface 64c. The second transmission rod 53 moves obliquely downward along the guide inclined surface 64c, and the second transmission rod 53 extends outward and drives the first blocking member 51 to extend outward toward the first oil hole D1, thereby blocking the first oil hole D1. Figure 7-8 shown.

[0056] In this embodiment, a second elastic member 66 and a baffle 631 are provided at one end of the second transmission member 63 away from the first oil hole D1. The baffle 631 is limited at the end of the second transmission member 63 by means of a nut 632. The two ends of the second elastic member 66 are respectively abutted against the side wall of the first transmission member 62 and the baffle 631, so that the second transmission member 63 always has a tendency to retract inward away from the direction where the first oil hole D1 is located. When the upper clamp 2 moves downward and the second transmission rod 53 extends outward, the second elastic member 66 is compressed; and when the upper clamp 2 moves upward, the first elastic member 67 converts the upward movement of the upper clamp 2 into its own gradual reset. During the reset process, the first transmission member 62 remains stationary, while the second transmission member 63 moves upward with the upper clamp 2 under the transmission of the connecting seat 61, and shrinks away from the direction of the first oil hole D1 under the elastic force of the compressed second elastic member 66, and the matching inclined surface 65b slides obliquely upward against the guiding inclined surface 64c. At this time, the first elastic member 67 releases the blockage of the first oil hole D1, as shown in FIG. Figure 13-14 When the upper clamp 2 moves further upward until the first elastic member 67 is reset and the second vertical surface 65a is close to the first vertical surface 64b, the first elastic member 67 transmits the upward movement of the upper clamp 2 to the first transmission rod 53, and the first transmission rod 53 begins to move upward with the upper clamp 2.

[0057] Since the first oil hole D1 and the second oil hole D2 are arranged adjacent to each other, and the second transmission member 63 in the transmission component 6 needs to extend and retract inward and outward to make the first blocking member 51 block the second oil hole D2, interference will occur between the second transmission member 63 and the transmission rod 53. Therefore, the transmission rod 53 of this embodiment has a third through hole 531 coaxially arranged with the first through hole 612 and the second through hole 613, and the second transmission member 63 can partially extend into the third through hole 531. Without affecting the transmission functions of the two, interference of the transmission rod 53 with the second transmission member 63 is avoided. At the same time, since the second transmission member 63 can extend into the third through hole 531, the volume occupied by the adjacent transmission rod 53 and the transmission component 6 is small, and they can be accommodated in the cavity 33 surrounded by the wall of the C-shaped notch 32 of the filling block 3, thereby avoiding interference between the blocking mechanism 5 and the cavity B to be tested.

[0058] In addition, in order to avoid damaging the cavity B to be tested when the lower end of the first transmission member 62 contacts the bottom wall of the cavity B to be tested, a flexible block 68 for protecting the bottom wall of the cavity B to be tested is provided at the lower end of the first transmission member 62. The flexible block 68 converts the contact between the first transmission member 62 and the bottom wall of the cavity B to be tested into a soft contact, thereby protecting the bottom wall of the cavity B to be tested.

[0059] In summary, the operating principle of the blocking mechanism 5 of this embodiment is as follows:

[0060] In the initial state, the second transmission member 63 is located at the upper end of the strip hole 621, the second vertical surface 65a and the first vertical surface 64b are in contact with each other, and the upper clamp 2 moves downward, driving the blocking mechanism 5 to move downward as a whole;

[0061] When the first transmission member 62 contacts the bottom wall of the chamber B to be tested, the first transmission member 62 stops moving, and the upper fixture 2 moves further downward to compress the first elastic member 67. Under the transmission of the connecting seat 61, the second transmission rod 53 also moves further downward, and the matching inclined surface 65b and the guide inclined surface 64c slide relatively, and the second transmission rod 53 moves obliquely downward along the guide inclined surface 64c. The second elastic member 66 is compressed, and the second transmission rod 53 extends outward and drives the first blocking member 51 to extend outward toward the first oil hole D1, thereby blocking the first oil hole D1. Figure 7-8 As shown;

[0062] After the air tightness test is completed, when the upper clamp 2 moves upward, the first elastic member 67 converts the upward movement of the upper clamp 2 into its own gradual reset. During the reset process, the first transmission member 62 remains stationary, while the second transmission member 63 moves upward with the upper clamp 2 under the transmission of the connecting seat 61, and shrinks away from the direction of the first oil hole D1 under the elastic force of the compressed second elastic member 66, and slides obliquely upward with the matching inclined surface 65b close to the guide inclined surface 64c. At this time, the first elastic member 67 releases the blockage of the first oil hole D1. Figure 13-14 As shown;

[0063] When the upper clamp 2 moves further upward until the first elastic member 67 is reset, the second vertical surface 65a is close to the first vertical surface 64b, and the second transmission member 63 is located at the upper end of the strip hole 621. The first elastic member 67 transmits the further upward movement of the upper clamp 2 to the first transmission rod 53, and the first transmission rod 53 begins to move upward with the upper clamp 2 until it returns to the initial state.

Claims

1. A device for detecting the air tightness of a product, comprising: The lower fixture (1) is used to carry the object to be inspected (A), wherein: The object to be inspected (A) comprises a cavity to be inspected (B) with an opening facing upward and an oil passage (D) arranged in the wall of the cavity to be inspected (B), wherein the oil passage (D) comprises a first oil hole (D1) arranged on the inner wall of the cavity to be inspected (B) and a second oil hole (D2) arranged on the bottom wall of the cavity to be inspected (B); An upper clamp (2) is used to press the object to be inspected (A) and is provided with a first sealing ring (21) for sealing the opening of the cavity to be inspected (B). The upper clamp (2) can move up and down relative to the lower clamp (1); and An air inlet hole is arranged on the upper fixture (2) and / or the lower fixture (1), and is externally connected to an air inlet mechanism, and is used to supply air to various positions to be inspected of the object to be inspected (A); The invention is characterized in that: it also includes a blocking mechanism (5) for blocking the oil passage (D); the upper fixture (2) has a filling block (3) capable of filling the cavity (B) to be tested; the filling block (3) includes a filling area (31) capable of filling the cavity (B) to be tested with an opening facing upward and leaving a gap, and a C-shaped notch (32) surrounded by the periphery of the filling area (31); the wall of the C-shaped notch (32) forms a cavity (33) for accommodating the blocking mechanism (5); the blocking mechanism (5) includes: A first blocking member (51) for blocking the first oil hole (D1); A transmission member (6) is movably connected to the upper clamp (2) and is capable of converting the downward movement of the upper clamp (2) into an outward extension of the first blocking member (51) relative to the direction of the first oil hole (D1) to block the first oil hole (D1); A second blocking member (52) for blocking the second oil hole (D2); The transmission rod (53) is arranged adjacent to the transmission member (6) and connected to the upper clamp (2), and can directly transmit the downward movement of the upper clamp (2) downward to the second sealing member (52) to seal the second oil hole (D2); the sealing mechanism (5) forms an independent closed space for the oil passage (D) when the first oil hole (D1) and the second oil hole (D2) are sealed, and when the external air supply mechanism only supplies air to the gap, the air tightness of the object to be inspected (A) can be determined with the help of the sealing mechanism (5).

2. The device for detecting the air tightness of a product according to claim 1, characterized in that: The transmission component (6) comprises: A connecting seat (61) is fixed to the bottom of the upper clamp (2) and can move up and down with the upper clamp (2), and the connecting seat (61) has a hollow portion (611) arranged along the moving direction of the upper clamp (2); A first transmission member (62) is disposed in the hollow portion (611), wherein the upper end of the first transmission member (62) is movably connected to the bottom of the upper clamp (2) and can slide in the hollow portion (611) so that the connecting seat (61) and the upper clamp (2) can move up and down relative to the first transmission member (62); A second transmission member (63), the connecting seat (61) is provided with a first through hole (612) for the second transmission member (63) to extend into the connecting seat (61) and a second through hole (613) for the second transmission member (63) to extend out of the connecting seat (61); correspondingly, the first transmission member (62) is provided with a strip hole (621) for the second transmission member (63) to pass through; the second transmission member (63) passes through the first through hole (612) in sequence; the strip hole (621) and the second through hole (613) are connected to the connecting seat (61) and the first transmission member (62); the strip hole (621) extends along the moving direction of the upper clamp (2); the second transmission member (63) can follow the connecting seat (61) and move up and down along the strip hole (621) relative to the first transmission member (62); the first blocking member (51) is provided at one end of the second transmission member (63) close to the first oil hole (D1); The acting part (64) is arranged on the first transmission member (62) and can act on the second transmission member (63), and can convert the up and down movement of the second transmission member (63) together with the first blocking member (51) relative to the first transmission member (62) into inward and outward expansion and contraction along the direction of the first oil hole (D1).

3. The device for detecting the air tightness of a product according to claim 2, characterized in that: The action portion (64) is a notch that is recessed inwardly on the side wall of the first transmission member (62), the notch faces the first oil hole (D1), and the notch includes a transverse surface (64a) extending inwardly from the side wall of the first transmission member (62), a first vertical surface (64b) extending downwardly from the transverse surface (64a), and a guide inclined surface (64c) extending downwardly and outwardly from the bottom of the first vertical surface (64b), and the strip hole (621) passes through the guide inclined surface (64c); The second transmission member (63) is provided with a matching portion (65) matching with the action portion, and the matching portion (65) includes a second vertical surface (65a) matching with the first vertical surface (64b), and a matching inclined surface (65b) connected to the bottom of the second vertical surface (65a) and arranged in the same direction as the guiding inclined surface (64c), and the matching inclined surface (65b) is provided with a protrusion (65c) capable of extending into the strip hole (621). With the help of the matching of the guiding inclined surface (64c) and the matching inclined surface (65b), the second transmission member (63) can move along the direction of the guiding inclined surface (64c) to realize the conversion of the up and down moving part of the second transmission member (63) following the connecting seat (61) into inward and outward extension along the direction of the first oil hole (D1).

4. The device for detecting air tightness of a product according to claim 3, characterized in that: A second elastic member (66) and a blocking piece (631) are provided at one end of the second transmission member (63) away from the first oil hole (D1); the blocking piece (631) is limited at the end of the second transmission member (63) by means of a nut (632); two ends of the second elastic member (66) are respectively in contact with the side wall of the first transmission member (62) and the blocking piece (631), so that the second transmission member (63) always has a tendency to retract inward in a direction away from the first oil hole (D1); When the upper clamp (2) is in a downward movement relative to the first transmission member (62), the connecting seat (61) drives the second transmission rod (53) to extend outward along the guide slope (64c) in the direction of the first oil hole (D1), and the second elastic member (66) is compressed; when the upper clamp (2) is in an upward movement relative to the first transmission member (62), the elastic force of the compressed second elastic member (66) pushes the second transmission rod (53) to retract inward away from the direction of the first oil hole (D1).

5. The device for detecting air tightness of a product according to claim 4, characterized in that: A first elastic member (67) is provided at the upper end of the first transmission member (62). The upper end portion of the first transmission member (62) is concave to form a groove portion (622). The two ends of the first elastic member (67) are respectively in contact with the bottom of the groove portion (622) and the upper clamp (2) to achieve a movable connection between the first transmission member (62) and the upper clamp (2). When the first transmission member (62) follows the upper clamp (2) to move downward until the lower end of the first transmission member (62) contacts the bottom wall of the chamber (B) to be tested, the upper clamp (2) can further move downward to compress the first elastic member (67). When the upper clamp (2) moves upward, the first transmission member (62) follows the upper clamp (2) to move upward after the first elastic member (67) is reset.

6. The device for detecting air tightness of a product according to claim 5, characterized in that: A flexible block (68) is provided at the lower end of the first transmission member (62) for protecting the bottom wall of the cavity (B) to be tested.

7. The device for detecting the air tightness of a product according to any one of claims 2 to 6, characterized in that: The transmission rod (53) has a third through hole (531) coaxially arranged with the first through hole (612) and the second through hole (613), and the second transmission member (63) partially extends into the third through hole (531).

8. The device for detecting the air tightness of a product according to any one of claims 1 to 6, characterized in that: The oil passage (D) of the object to be inspected (A) also has a third oil hole (D3) which is arranged on the side wall of the cavity to be inspected (B) and opens upward, and the upper clamp (2) is correspondingly provided with a second sealing ring (22) which matches the third oil hole (D3), and the air inlet hole includes a first air inlet hole (41) which is arranged on the upper clamp (2) and is fluidically connected to the third oil hole (D3).

9. The device for detecting air tightness of a product according to claim 8, characterized in that: The air inlet hole also includes a second air inlet hole (42) which is arranged on the lower fixture (1) and is in fluid communication with the cavity (B) to be tested.

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