A device for detecting air tightness of products

Abstract

The present invention discloses a device for detecting the air tightness of a product, comprising a lower clamp, an upper clamp, an air inlet, and a sealing mechanism for sealing an oil channel, wherein the upper clamp has a filling block that can be filled in a cavity to be tested, and the filling block can fill the cavity to be tested and reserve a gap. When detecting the air tightness of the cavity to be tested, an 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; the sealing mechanism is accommodated in a cavity surrounded by a C-shaped notch of the filling block, and the sealing mechanism is only composed of 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, and 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, and the volume occupied is small.

Description

Technical Field

[0001] The present invention relates to an air tightness detection device for a product, in particular to a device for detecting the air tightness of automobile parts. Background Art

[0002] Many automotive parts production requirements have stricter requirements for water resistance or air tightness. Only products that meet these requirements are allowed to leave the factory. Water resistance or air tightness testing devices can be used to inspect these devices. Both devices utilize air to quickly and accurately determine the degree of leakage in the object being inspected.

[0003] In the prior art, an air tightness testing fixture for automotive parts, such as the Chinese utility model patent CN201420160604.8 (authorization announcement CN203858078U), discloses an "air tightness testing device for the base of a passenger car airbag," 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 provided on the bottom surface of the upper slide, and a lower sealing seat is provided on the top surface of the lower slide. The airbag base to be tested is provided between the upper and lower sealing seats.

[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 sealed to connect the two. 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 sealed at the same time. If the following method is used: Figure 3The sealing mechanism 4' shown in the figure is manually sealed, and the sealing mechanism 4' comprises a first sealing assembly 41' for sealing the first oil hole 31', a second sealing assembly 42' for sealing the second oil hole 32', and a connecting seat 43' connecting the first sealing assembly 41' and the second sealing assembly 42', wherein the first sealing assembly 41' has a first sealing piece 411' for sealing the first oil hole 31' and a connecting seat 43' for the operator to operate the first sealing assembly The first force-applying portion 412' of the blocking member 411', which determines whether the first oil hole 31' is blocked, and the second blocking member 421' of the second blocking member 421', which is used by the operator to block the second oil hole 32', and the second force-applying portion 422', which allows the operator to control whether the second blocking member 421' blocks the second oil hole 32' are blocked. Due to the limited space within the cavity 2', to facilitate operator operation, the first force-applying portion 411' and the second force-applying portion 421' are both located outside the cavity 2'. However, this arrangement has the following problems: although the first oil hole 31' and the second oil hole 31' can be blocked, because the blocking members of the blocking mechanism 4' are located inside the cavity 2' and the force-applying portion is located outside the cavity 2', the cavity 2' may not be blocked.

[0005] If an automatic sealing method is used, a driving source such as an air cylinder or oil cylinder is required to drive the first sealing member 411' and the second sealing member 421'. Therefore, there must be space within the cavity 2' to accommodate the driving source. However, the space within the cavity 2' is limited, and the side walls of the cavity 2' will interfere with the installation of the driving source. At the same time, because the first oil hole 31' and the second oil hole 32' are located adjacent to each other, the driving source driving the first sealing member 411' and the driving source driving the second sealing member 421' will also interfere. Therefore, existing devices for detecting product airtightness need 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 response to the above-mentioned existing technical status, which can better improve the efficiency of air tightness detection, especially for products with interconnected cavities to be tested.

[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 the interference phenomenon caused by simultaneously blocking the cavity to be tested, in response to 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 the 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 upward opening and an oil passage provided in a wall portion of the cavity to be inspected, the oil passage having a first oil hole provided in an inner wall of the cavity to be inspected and a second oil hole provided in a bottom wall of the cavity to be inspected;

[0010] An upper fixture, used to press 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 various positions to be inspected of the object to be inspected;

[0012] The invention is characterized in that: it also includes a sealing mechanism for sealing the oil channel, 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 upward opening 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 sealing mechanism, and the sealing mechanism includes:

[0013] a first blocking member, used for blocking the first oil hole;

[0014] a transmission member movably connected to the upper clamp, capable of converting 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, thereby blocking the first oil hole;

[0015] a second blocking member, used for blocking the second oil hole;

[0016] The 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 block 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 blocked, 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 component includes:

[0018] A connecting seat is fixed to the bottom of the upper clamp and can move up and down with the upper clamp, and the connecting seat has a hollow portion arranged along the moving direction of the upper clamp;

[0019] a first transmission member disposed in the hollow portion, wherein an upper end of the first transmission member is movably connected to a bottom of the upper clamp and is capable of sliding 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 and move up and down relative to the first transmission member along the strip hole, the first blocking member is provided at one end of the second transmission member close to the first oil hole;

[0021] The action part is provided 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 and 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 a dual function. 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 setting 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 setting 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 provided 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 portion 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 portion is a notch recessed inwardly in the side wall of the first transmission member, the notch facing 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 guide inclined surface extending downwardly and outwardly from the bottom of the first vertical surface, and the strip hole passes through the guide inclined surface;

[0024] The second transmission member is provided with a mating portion that cooperates with the acting portion, and the mating portion includes a second vertical surface that cooperates with the first vertical surface, and a mating inclined surface connected to the bottom of the second vertical surface and arranged in the same direction as the guide inclined surface. The mating 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 mating 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 retracts 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 to the end of the second transmission member by means of a nut. The two ends of the second elastic member respectively abut against 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 toward 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 setting 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 up with the upper clamp, and the matching inclined surface can always be close to the guide inclined surface, so that the second transmission member can move obliquely upward along the guide inclined surface to return to its initial state.

[0029] In order to movably 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 concave 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] To prevent the lower end of the first transmission member from scratching the chamber when it contacts the bottom wall of the chamber, a flexible block is preferably provided at the lower end of the first transmission member to protect the bottom wall of the chamber. This ensures soft contact between the first transmission member and the bottom wall of the chamber, preventing the first transmission member from damaging the chamber.

[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 inward and outward, interference will occur between the second transmission member and the transmission rod. Therefore, a third perforation is provided 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 on 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. To supply air to the oil channel, the oil channel of the object to be inspected preferably further comprises a third oil hole, located on the sidewall of the cavity to be inspected and opening upward. The upper fixture is provided with a second sealing ring corresponding to the third oil hole. The air inlet includes a first air inlet hole, located on the upper fixture and fluidically connected to the third oil hole. The second sealing ring seals the third oil hole when the upper fixture moves downward, while the first air inlet, via an external air inlet mechanism, supplies air to the oil channel, thereby testing the oil channel's air tightness.

[0032] In order to supply air to the cavity to be tested, preferably, the air inlet further includes a second air inlet provided on the lower fixture and in fluid communication with the cavity to be tested. The second air inlet is also externally connected to an air inlet mechanism, capable of supplying 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. This device for testing product air tightness is equipped with a filling block on the upper fixture that can be filled in the cavity to be tested. When testing 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. Due to the small gap, the air filling speed is fast and uniform, which improves the efficiency and accuracy of air tightness testing.

[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 only of a first sealing part, a transmission component, a second sealing part 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 part 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 part 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 diagram of the product in the background technology of the present invention;

[0037] Figure 2 for Figure 1 Cross-sectional view at EE;

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

[0039] Figure 4 Schematic diagram of the structure of an embodiment of the present invention;

[0040] Figure 5 A schematic structural diagram 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 This is a schematic structural diagram of an embodiment of the present invention in a blocked state;

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

[0044] Figure 9 This is a schematic structural diagram of a filling block in an embodiment of the present invention;

[0045] Figure 10 Schematic diagram of the structure of the transmission component in an embodiment of the present invention;

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

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

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

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

[0050] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0051] like Figure 4-14FIG. 1 is a preferred embodiment of the present invention. The device for testing the air tightness of a product in this embodiment includes a lower fixture 1 for placing an object A to be inspected, an upper fixture 2 for pressing the object A to be inspected, and air inlet holes provided 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 upward opening and an oil channel D provided in the wall of the cavity B to be tested. The oil channel D has a first oil hole D1 provided on the inner wall of the cavity B to be tested, a second oil hole D2 provided on the bottom wall of the cavity B to be tested, a third oil hole D3 provided on the side wall of the cavity B to be tested and opening upward, and two fourth oil holes D4 provided on the outer wall of the cavity B to be tested, wherein the second oil hole D2 is provided 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 test cavity B and the oil channel D, and then supply air to the oil channel D and the test cavity B to independently test the air tightness of the test cavity B and the oil channel D. Therefore, refer to Figure 7-8In the device of this embodiment, a first sealing ring 21 for sealing the opening of the test cavity B and a second sealing ring 22 for sealing the third oil hole D3 are provided on the upper fixture 2. A third sealing ring 11 for blocking the bottom opening of the test cavity B is provided on the lower fixture 1. By moving the upper fixture 2 up and down relative to the lower fixture 1, the test cavity B and the third oil hole D3 of the oil channel D can be blocked. The device also includes a sealing mechanism 5 on the upper fixture 2. The sealing mechanism 5 includes a first sealing member 51 for sealing the first oil hole D1 and a second sealing member 52 for sealing the second oil hole D2. The first sealing member 51 is connected to a transmission member 6, which is movably connected to the upper fixture 2 and can convert downward movement of the upper fixture 2 into outward extension of the first sealing member 51 relative to the first oil hole D1, thereby sealing the first oil hole D1. The second sealing member 52 is connected to a transmission rod 53, which is located adjacent to the transmission member 6 and connected to the upper fixture 2 and can directly transmit downward movement of the upper fixture 2 to the second sealing member 52, thereby sealing the second oil hole D2. Furthermore, the lower fixture 1 is provided with a third sealing member 7 for sealing the fourth oil hole D4. This third sealing member 7 is driven by a drive source 8 provided on the lower fixture 1 to seal the fourth oil hole D4. Each sealing ring and blocking member blocks its corresponding opening or oil hole one by one, forming an independent, sealed space within the test cavity B and the oil passage D. This blocking mechanism 5 utilizes only a transmission member 6 to convert the vertical movement of the upper fixture 2 into the inward and outward expansion and contraction of the first blocking member 51 to block the first oil hole D1. Furthermore, a transmission rod 53 directly transmits the vertical movement of the upper fixture 2 downward to the second blocking member 52 to block the second oil hole D2. This eliminates the need for a separate drive source 8 to drive the first and second blocking members 51, 52. Consequently, it occupies a small footprint and does not interfere with the test cavity B. 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 fluid of the third oil hole D3, and a second air inlet hole 42 provided on the lower clamp 1 and connected to the fluid of the cavity B to be tested. The first air inlet hole 41 and the second air inlet hole 42 are respectively connected to an air intake mechanism to supply 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 pressure value required 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 set on the upper fixture 2. Figure 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 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 portion of the first transmission member 62 is concave to form a groove portion 622. The two ends of the first elastic member 67 respectively abut against the bottom of the groove portion 622 and the upper clamp 2 to movably connect the first transmission member 62 to the upper clamp 2. The connecting seat 61 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 base 61 is further provided with a first through-hole 612 for the second transmission member 63 to extend into the connecting base 61, and a second through-hole 613 for the second transmission member 63 to extend out of the connecting base 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 sequentially passes through the first through-hole 612. The strip hole 621 and the second through-hole 613 are connected to the connecting base 61 and the first transmission member 62. The strip hole 621 extends along the movement direction of the upper clamp 2. The second transmission member 63 can move up and down along the strip hole 621 relative to the first transmission member 62, following the connecting base 61. The first blocking member 51 is provided at one end of the second transmission member 63 near the first oil hole D1. The first transmission member 62 is provided with an acting portion 64 that acts on the second transmission member 63. This acting portion 64 can convert the up and down movement of the second transmission member 63 and 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. Specifically, the acting 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 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; and the second transmission member 63 is provided with a matching portion 65 that matches the acting portion 64, and 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 guide inclined surface 64c, and a protrusion 65c that can extend into the strip hole 621 is provided on the matching inclined surface 65b. With the help of the matching guiding inclined surface 64c and the matching inclined surface 65b, the second transmission member 63 can move along the direction of the guide 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, compressing the first elastic member 67. Under the transmission of the connecting seat 61, the second transmission rod 53 also moves further downward, and slides relative to each other between the matching inclined surface 65b and the guide inclined surface 64c. The second transmission rod 53 moves downward obliquely 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 the 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 in contact with 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 inward 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 guide 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 pressed against 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 expand and contract 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 respective transmission functions of the two, the interference of the transmission rod 53 on 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 prevent the lower end of the first transmission member 62 from damaging the cavity B to be tested when it 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 clamp 2 moves further downward, compressing 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 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, and the second transmission member 63 moves upward with the upper clamp 2 under the transmission of the connecting seat 61, and shrinks inward 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 follow the upper clamp 2 to move upward 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 place the object (A) to be inspected, wherein: The object to be inspected (A) includes a cavity to be inspected (B) with an upward opening and an oil passage (D) provided in a wall portion of the cavity to be inspected (B). The oil passage (D) includes a first oil hole (D1) provided in an inner wall of the cavity to be inspected (B) and a second oil hole (D2) provided in a 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 provided on the upper fixture (2) and / or the lower fixture (1), and is externally connected to an air inlet mechanism for supplying 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 upward opening 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); and 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 can convert 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 blocking member (52) to block the second oil hole (D2); the blocking mechanism (5) forms an independent closed space in the oil channel (D) when the first oil hole (D1) and the second oil hole (D2) are blocked, and the air tightness of the object to be inspected (A) can be determined with the help of the blocking mechanism (5) when the external air supply mechanism only supplies air to the gap.

2. The device for detecting the air tightness of a product according to claim 1, characterized in that: The transmission component (6) includes: 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); The second transmission member (63) is provided on the connecting seat (61) 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 portion (64) is provided 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 facing 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-shaped hole (621) passes through the guide inclined surface (64c); The second transmission member (63) is provided with a matching portion (65) that matches the action portion, and the matching portion (65) includes a second vertical surface (65a) that matches 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 guide inclined surface (64c), and the matching inclined surface (65b) is provided with a protrusion (65c) that can extend into the strip hole (621). With the help of the matching of the guide inclined surface (64c) and the matching inclined surface (65b), the second transmission member (63) can move along the direction of the guide inclined surface (64c), so as to realize the conversion of the up and down movement of the second transmission member (63) following the connecting seat (61) into the extension and contraction in the direction of the first oil hole (D1).

4. The device for detecting the 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); the two ends of the second elastic member (66) respectively abut against 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 position 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 position 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 the air tightness of a product according to claim 4, characterized in that: The upper end of the first transmission member (62) is provided with a first elastic member (67), and 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 realize the 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 cavity (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 the air tightness of a product according to claim 5, characterized in that: 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).

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) further comprises a third oil hole (D3) provided on the side wall of the cavity to be inspected (B) and opening upward, the upper fixture (2) correspondingly being provided with a second sealing ring (22) matching the third oil hole (D3), and the air inlet hole comprising a first air inlet hole (41) provided on the upper fixture (2) and fluidically connected to the third oil hole (D3).

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

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