Air tightness detection auxiliary jig

Abstract

The utility model belongs to the technical field of sealing test equipment, and discloses an air tightness detection auxiliary tool, which comprises a carrying table, an airtight block, a connecting piece, a first sealing ring and a pressing mechanism, and is characterized in that the carrying table is provided with a profiling groove for placing a product to be detected, and the profiling groove is internally provided with a through hole extending along the vertical direction; the airtight block is fixed to the carrying table, a first connecting channel is formed in the airtight block in a penetrating mode, the connecting piece is partially arranged in the first connecting channel and penetrates into the profiling groove through the through hole, and the first sealing ring is located between a step arranged in the first connecting channel and the connecting piece; the movable end of the downward pressing mechanism is movably arranged above the carrying table in the vertical direction. According to the air tightness detection auxiliary jig, the connecting piece and the tester can be communicated through the first connecting channel in the airtight block, meanwhile, the first connecting channel and the external atmosphere are isolated through the first sealing ring, when the connecting piece is replaced, the sealing performance between the connecting piece and the tester is not affected, and the detection precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing test equipment, in particular to an airtightness detection auxiliary jig. Background Art

[0002] In the manufacturing process of medical devices, the air tightness of the product is one of the key factors to ensure its safety and reliability, especially for products used to load liquid medicines, such as insulin injection devices, whose air tightness directly affects the storage and use of liquid medicines.

[0003] When testing products, traditional air tightness testing devices need to use connectors to connect and conduct the product's opening and the detector. When facing air tightness testing of different products, the connector used to connect the detector needs to be replaced according to the shape of the product's opening. This may lead to problems with loose sealing between the connector and the detector, which in turn affects the test results. Utility Model Content

[0004] The purpose of the utility model is to provide an auxiliary tool for air tightness detection, which is used to solve the problem of poor sealing between a connector and a detection device when the air tightness of a product to be tested is determined.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] An auxiliary fixture for airtightness detection includes a carrier, an airtight block, a connecting piece, a first sealing ring and a pressing mechanism. The carrier is provided with a contoured groove for placing the product to be tested, and a through hole extending in the vertical direction is provided in the contoured groove; the airtight block is fixed to the carrier, and a first connecting channel is provided through the airtight block, the first end of the first connecting channel is used to connect the tester, and the second end of the first connecting channel is coaxially arranged with the through hole; the connecting piece is provided in the first connecting channel, the connecting piece passes through the contoured groove through the through hole, and a second connecting channel communicating with the first connecting channel is provided through the connecting piece; the first sealing ring is located on a step provided in the first connecting channel and abuts against the connecting piece; the movable end of the pressing mechanism is movably provided above the carrier in the vertical direction to squeeze the product to be tested located in the contoured groove.

[0007] In one embodiment, the airtightness detection auxiliary fixture also includes a second sealing ring and a third sealing ring. The second sealing ring is clamped between the carrier and the airtight block and is coaxially arranged with the through hole. The third sealing ring is sleeved on the connecting piece and abuts against the hole wall of the through hole.

[0008] In one embodiment, the connecting member is a needle, and the needle can pass through the sealing member that blocks the first opening of the product to be tested.

[0009] In one embodiment, the airtightness detection auxiliary fixture further includes a fourth sealing ring for sealing the gap between the second opening of the product to be tested and the contoured groove, and the fourth sealing ring is located in the contoured groove.

[0010] In one embodiment, a positioning pin is provided in the contoured groove, and the positioning pin can be inserted into a positioning hole provided on the product to be tested.

[0011] In one embodiment, the airtight block and the carrier are connected in a detachable manner, as are the pressing mechanism and the carrier.

[0012] In one embodiment, a buffer seat is provided at the bottom of the carrier.

[0013] In one embodiment, the pressing mechanism includes a fixed side plate, a pressing drive and a pressing block. The pressing drive is installed on the carrier through the fixed side plate. The pressing block is arranged at the movable end of the pressing drive to move toward the contoured groove under the action of the pressing drive.

[0014] In one embodiment, the pressing mechanism further includes a buffer assembly, and the buffer assembly is arranged between the pressing block and the pressing driving member.

[0015] In one embodiment, the buffer assembly includes a buffer sleeve, a buffer rod and an elastic member, one of the buffer sleeve and the buffer rod is fixed to the movable end of the downward driving member, and the other is fixed to the pressure block, the buffer rod is movably inserted into the buffer sleeve along the vertical direction, and the elastic member is used to provide buffering for the movement of the buffer rod relative to the buffer sleeve.

[0016] The beneficial effects of the utility model are as follows: the airtightness detection auxiliary fixture proposed by the utility model utilizes the first connecting channel in the airtight block to connect the connector and the tester, without the need to directly connect the connector and the tester. At the same time, the first sealing ring is utilized to isolate the first connecting channel from the outside atmosphere. When the connector is replaced, the sealing between the connector and the tester is not affected, and the detection accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the airtightness detection auxiliary fixture in the embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of an auxiliary jig for airtightness detection according to an embodiment of the present utility model;

[0019] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 1 is a top view of the carrier in an embodiment of the present utility model;

[0021] Figure 5 1 is a side view of the airtightness detection auxiliary jig in an embodiment of the present utility model;

[0022] Figure 6 This is a front view of the airtightness detection auxiliary fixture in the embodiment of the present utility model;

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the airtightness detection auxiliary fixture in the embodiment of the present utility model from another angle.

[0024] In the picture:

[0025] 1. Carrier; 11. Base; 12. Connecting rod; 13. Carrier plate; 131. Contoured groove; 132. Positioning groove; 133. Through hole; 134. Positioning pin; 2. Airtight block; 21. First connecting channel; 211. First sub-channel; 212. Second sub-channel; 213. Step; 3. Connecting piece; 31. Second connecting channel; 4. First sealing ring; 5. Pressing mechanism; 51. Fixed side plate; 52. Pressing drive member; 53. Pressing block; 54. Buffer assembly; 541. Buffer sleeve; 542. Buffer rod; 543. Elastic piece; 544. First connecting plate; 545. Second connecting plate; 55. Guide assembly; 551. Slider; 552. Slide rail; 56. Reinforcing rib; 6. Second sealing ring; 7. Third sealing ring; 8. Fourth sealing ring; 9. Buffer seat. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0027] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0030] refer to Figure 1-Figure 7 As shown, in the embodiment of the present invention, an airtightness detection auxiliary fixture is proposed, which can cooperate with the detector to perform airtightness detection on the product to be tested, and the product to be tested has an inner cavity and a first opening connecting the inner cavity with the outside world. The airtightness detection auxiliary fixture includes a carrier 1, a pressing mechanism 5, a connector 3, a first sealing ring 4 and an airtight block 2, wherein the carrier 1 is provided with a contoured groove 131 that matches the shape of the product to be tested, and the product to be tested can be placed in the contoured groove 131, the airtight block 2 is fixed on the carrier 1 and is penetrated by a first connecting channel 21, the first end of the first connecting channel 21 is inserted with a connector for connecting to the tester, and the tester is connected to the first connecting channel 21 through the connector so that it can inflate the first connecting channel 21 and monitor the air pressure in the first connecting channel 21 at the same time, and the second end of the first connecting channel 21 is connected to the through hole 13 vertically arranged in the contoured groove 131. 3 is connected and coaxially arranged with the through hole 133. The first end of the connecting member 3 is located in the first connecting channel 21. The second end of the connecting member 3 penetrates from bottom to top into the profiling groove 131 through the through hole 133 to connect with the product to be tested. A second connecting channel 31 communicating with the first connecting channel 21 is provided through the connecting member 3. A step 213 is also provided in the first connecting channel 21. The first sealing ring 4 is located on the step 213 and abuts against the first end face of the connecting member 3 to seal the gap between the connecting member 3 and the first connecting channel 21. The movable end of the pressing mechanism 5 is movably arranged above the carrier 1 in the vertical direction and can squeeze the product to be tested located in the profiling groove 131.

[0031] After the product to be tested is placed in the contoured groove 131, the pressing mechanism 5 moves downward and applies pressure to the product. Under the action of pressure, the connector 3 squeezes the first sealing ring 4, causing it to press against the step 213 and the connector 3, isolating the test air path (the first connecting channel 21 and the second connecting channel 31) from the outside atmosphere. The tester inflates the inner cavity of the product to be tested through the first connecting channel 21 and the connector 3. After reaching the set pressure, the pressure is maintained to determine the airtightness of the product. Because the connector 3 is not connected to the tester, the sealing between the connector 3 and the tester is not affected when testing different products to be tested, and the detection accuracy is high.

[0032] It is understood that the tester can be any existing instrument for air tightness testing. For example, the tester includes an air pump, a reference product, a differential pressure sensor, and a piezoelectric sensor. The air pump can simultaneously inflate the reference product and the product to be tested, the piezoelectric sensor can detect air pressure, and the differential pressure sensor is used to detect the pressure difference between the inner cavity of the reference product and the inner cavity of the product to be tested, thereby determining whether the product to be tested is leaking. If the product to be tested is leaking, the pressure value in the inner cavity of the product to be tested will inevitably be lower than the pressure value in the inner cavity of the reference product.

[0033] refer to Figure 3 As shown, the first connecting channel 21 includes a first sub-channel 211 extending in the horizontal direction and a second sub-channel 212 extending in the vertical direction. The first sub-channel 211 and the second sub-channel 212 are interconnected, the joint is fixed to one end of the first sub-channel 211, and the connecting piece 3 is located in the second sub-channel 212. In order to reduce the processing difficulty of the first connecting channel 21 and the second connecting channel 31, the first sub-channel 211 passes through the opposite sides of the airtight block 2 in the horizontal direction, while the second sub-channel 212 passes through the opposite sides of the airtight block 2 in the vertical direction, and the second sub-channel 212 includes a large diameter section and a small diameter section. The small diameter section is arranged at the end of the large diameter section away from the through hole 133, and the above-mentioned step 213 is formed between the small diameter section and the large diameter section. The connecting piece 3 is located in the large diameter section. It is understandable that in order to prevent air leakage, the end of the first sub-channel 211 away from the joint and the end of the second sub-channel 212 away from the through hole 133 are both blocked with plugs.

[0034] Specifically, in order to prevent the first sealing ring 4 from shifting and affecting the sealing effect, an annular first mounting groove is further opened on the surface of the step 213. The first sealing ring 4 is placed in the first mounting groove and partially protrudes from the first mounting groove.

[0035] Continue to refer Figure 3As shown, the airtightness test auxiliary fixture also includes a second sealing ring 6 and a third sealing ring 7. The second sealing ring 6 is sandwiched between the carrier 1 and the airtight block 2 and is coaxially arranged with the second sub-channel 212. The third sealing ring 7 is sleeved on the connector 3 and abuts against the wall of the through hole 133. The provision of the second sealing ring 6 and the third sealing ring 7 can prevent air leakage after the failure of the first sealing ring 4, and improve the sealing effect.

[0036] Specifically, two second sealing rings 6 are provided, one on the carrier 1 and the other on the airtight block 2. When the airtight block 2 is assembled on the carrier 1, the two second sealing rings 6 squeeze each other. More specifically, both the carrier 1 and the airtight block 2 are provided with an annular second mounting groove for mounting the second sealing ring 6.

[0037] In one embodiment, the product to be tested is a product for loading liquid medicines such as insulin, wherein the first opening is an injection port, which is used to inject liquid medicines into the inner cavity of the product to be tested during production, and the injection port is sealed with a seal (such as a rubber stopper). At this time, the connector 3 is a needle, and the needle can pass through the rubber stopper under the action of the pressing mechanism 5 to communicate with the inner cavity of the product to be tested. The size and length of the needle can be adjusted according to the position and depth of the injection port of the product to ensure that it can be smoothly inserted into the inner cavity of the product to be tested. When the needle is inserted into the injection port of the product to be tested, it actually passes through the injection seal to enter the inner cavity, avoiding damage to other parts of the product to be tested and ensuring the integrity and safety of the product to be tested.

[0038] Based on the setting that the product to be tested is a product for loading liquid medicine, the product to be tested also includes a second opening, which is a connecting port for connecting to an injection device for injecting liquid medicine into a human body.

[0039] On this basis, the contoured groove 131 includes a sub-groove for the second opening to be inserted. A fourth sealing ring 8 is positioned along the outer edge of the sub-groove to seal the gap between the second opening and the sub-groove (and, therefore, the contoured groove 131). When the pressing mechanism 5 applies pressure to the product to be tested, the second opening can be fitted over the fourth sealing ring 8 and inserted into the sub-groove. The fourth sealing ring 8 forms a seal under the pressure of the product to be tested and the carrier 1. For example, the first sealing ring 4, second sealing ring 6, third sealing ring 7, and fourth sealing ring 8 are all made of silicone or rubber, providing excellent sealing properties.

[0040] At the same time, a positioning pin 134 is also provided in the contoured groove 131 , and the positioning pin 134 can be inserted into a positioning hole provided on the product to be tested, so as to prevent the product to be tested from shifting during the testing process and affecting the test results.

[0041] refer to Figure 2As shown, the carrier 1 includes a base 11, a carrier plate 13 and a connecting rod 12, wherein the base 11 serves as a supporting foundation, one end of the connecting rod 12 is connected to the base 11, and the other end is connected to the carrier plate 13, the contoured groove 131 and the through hole 133 are both opened on the carrier plate 13, and the airtight block 2 is fixed to the lower surface of the carrier plate 13.

[0042] To improve applicability and meet the airtightness testing requirements of different products, the carrier plate 13 is detachably connected to the connecting rod 12 and the airtight block 2 using methods including but not limited to bolt connections. By replacing the carrier plate 13 with different contoured grooves 131, airtightness testing can be performed on different products. It is understood that when replacing the carrier plate 13, the connector 3 can also be replaced as needed.

[0043] Exemplarily, the carrier plate 13 is configured as a rectangular structure, with mounting holes for bolts to pass through provided at its four corners respectively, and four connecting rods 12 are correspondingly provided. A threaded hole is provided on the end face of the connecting rod 12 away from the base 11, and the carrier plate 13 and the connecting rod 12 are connected by bolts passing through the mounting holes and the threaded holes.

[0044] Optionally, the tester is fixed to the lower surface of the carrier plate 13. To facilitate replacement of the carrier plate 13, the tester is also detachably connected to the carrier plate 13 using methods including, but not limited to, bolt connections. Specifically, to simplify assembly of the needle connected to the tester, a positioning groove 132 is provided on the lower surface of the carrier plate 13, and the tester is installed in the positioning groove 132.

[0045] Optionally, the platform 1 further includes a buffer seat 9, which is disposed at the bottom of the base 11 to provide a buffer when the pressing mechanism 5 applies pressure to the product, thereby increasing the service life of the platform 1. Specifically, four buffer seats 9 are also provided, and the four buffer seats 9 are respectively located at the four corners of the base 11.

[0046] refer to Figure 5 and Figure 6 As shown, the pressing mechanism 5 includes a fixed side plate 51, a pressing drive 52, and a pressure block 53. The fixed side plate 51 is fixed to the carrier plate 13 and is located on one side of the profiling groove 131 by a method including but not limited to a detachable connection. The pressing drive 52 is mounted on the side of the fixed side plate 51 facing the profiling groove 131. The pressure block 53 is disposed at the movable end of the pressing drive 52 so as to move toward the profiling groove 131 under the action of the pressing drive 52, thereby applying pressure to the workpiece to be tested within the profiling groove 131. For example, the pressing drive 52 utilizes a toggle clamp, which can prevent the pressure of the pressure block 53 on the product to be tested from changing due to reaction force, further improving the accuracy of airtightness testing. In other embodiments, the pressing drive 52 can also utilize an automatic drive structure such as an oil cylinder or electric cylinder to achieve automated airtightness testing.

[0047] Optionally, in order to protect the product and prevent hard impact during the pressing process, the pressing mechanism 5 further includes a buffer assembly 54, which is arranged between the pressing block 53 and the pressing drive 52. Specifically, the buffer assembly 54 includes a first connecting plate 544, a second connecting plate 545, a buffer sleeve 541, a buffer rod 542 and an elastic member 543, wherein the first connecting plate 544 is fixed to the movable end of the pressing drive 52, the second connecting plate 545 is fixed to the pressing block 53, one of the buffer sleeve 541 and the buffer rod 542 is fixed to the pressing drive 52 through the first connecting plate 544, and the other is fixed to the pressing block 53 through the second connecting plate 545, and the buffer rod 542 is movably inserted into the buffer sleeve 541 along the vertical direction, and the elastic member 543 is used to provide buffering for the movement of the buffer rod 542 relative to the buffer sleeve 541.

[0048] Exemplarily, the buffer sleeve 541 is fixed on the first connecting plate 544, the buffer rod 542 is fixed on the second connecting plate 545, and the elastic member 543 is a spring sleeved on the buffer rod 542, one end of the spring is fixed on the buffer sleeve 541, and the other end abuts or is connected to the second connecting plate 545.

[0049] Continue to refer Figure 5 As shown, in order to guide the moving direction of the pressing block 53, the pressing mechanism 5 also includes a guide assembly 55, which includes a slide rail 552 and a slider 551, wherein the slide rail 552 is fixed on the fixed side plate 51 and extends along the axial direction of the buffer sleeve 541, and the slider 551 is fixed on the pressing block 53 and is slidably arranged on the slide rail 552.

[0050] In addition, the pressing mechanism 5 further includes a reinforcing rib 56 . The reinforcing rib 56 is fixedly disposed on a side of the fixed side plate 51 facing away from the pressing driving member 52 to provide structural strength to the pressing mechanism 5 .

[0051] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An auxiliary fixture for air tightness detection, characterized in that: The airtightness detection auxiliary fixture includes: A carrier (1), wherein the carrier (1) is provided with a contoured groove (131) for placing a product to be tested, and a through hole (133) extending in a vertical direction is provided in the contoured groove (131); An airtight block (2) is fixed on the carrier (1), and a first connecting channel (21) is provided through the airtight block (2), a first end of the first connecting channel (21) is used for connecting to a tester, and a second end of the first connecting channel (21) is coaxially arranged with the through hole (133); A connecting member (3) is partially disposed in the first connecting channel (21), the connecting member (3) penetrates from bottom to top through the through hole (133) into the contoured groove (131), and a second connecting channel (31) communicating with the first connecting channel (21) is provided through the connecting member (3); A first sealing ring (4), the first sealing ring (4) being located on a step (213) provided in the first connecting channel (21) and abutting against the connecting member (3); A pressing mechanism (5), wherein the movable end of the pressing mechanism (5) is movably arranged above the carrier (1) in a vertical direction, and is used for pressing the product to be tested in the profiling groove (131).

2. The airtightness detection auxiliary jig according to claim 1, characterized in that: The airtightness detection auxiliary fixture further includes a second sealing ring (6) and a third sealing ring (7), wherein the second sealing ring (6) is clamped between the carrier (1) and the airtight block (2) and is coaxially arranged with the through hole (133), and the third sealing ring (7) is sleeved on the connecting member (3) and abuts against the hole wall of the through hole (133).

3. The airtightness detection auxiliary jig according to claim 1, characterized in that: The connecting piece (3) is a needle, and the needle is capable of passing through the injection seal that blocks the first opening of the product to be tested.

4. The airtightness detection auxiliary jig according to claim 1, characterized in that: The airtightness detection auxiliary fixture further comprises a fourth sealing ring (8) for sealing the gap between the second opening of the product to be tested and the contoured groove (131), and the fourth sealing ring (8) is located in the contoured groove (131).

5. The airtightness detection auxiliary jig according to claim 1, characterized in that: A positioning pin (134) is provided in the contoured groove (131), and the positioning pin (134) can be inserted into a positioning hole provided on the product to be tested.

6. The airtightness detection auxiliary jig according to claim 1, characterized in that: The airtight block (2) and the carrier (1), as well as the pressing mechanism (5) and the carrier (1), can be detachably connected.

7. The airtightness detection auxiliary jig according to claim 1, characterized in that: A buffer seat (9) is provided at the bottom of the carrier (1).

8. The airtightness detection auxiliary jig according to claim 1, characterized in that: The pressing mechanism (5) comprises a fixed side plate (51), a pressing drive member (52) and a pressing block (53); the pressing drive member (52) is mounted on the carrier (1) via the fixed side plate (51); and the pressing block (53) is arranged at the movable end of the pressing drive member (52) so as to move toward the contoured groove (131) under the action of the pressing drive member (52).

9. The airtightness detection auxiliary jig according to claim 8, characterized in that: The pressing mechanism (5) further comprises a buffer assembly (54), and the buffer assembly (54) is arranged between the pressing block (53) and the pressing driving member (52).

10. The airtightness detection auxiliary jig according to claim 9, characterized in that: The buffer assembly (54) includes a buffer sleeve (541), a buffer rod (542) and an elastic member (543). One of the buffer sleeve (541) and the buffer rod (542) is fixed to the movable end of the downward driving member (52), and the other is fixed to the pressing block (53). The buffer rod (542) is movably inserted into the buffer sleeve (541) in a vertical direction. The elastic member (543) is used to provide buffering for the movement of the buffer rod (542) relative to the buffer sleeve (541).

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