Plugging mechanism for air tightness detection tool and air tightness detection tool

Abstract

The utility model relates to the technical field of air tightness detection, and provides a plugging mechanism for an air tightness detection tool and the air tightness detection tool. The plugging piece is movably connected to the fixing base and movably abuts against the inner wall of the workpiece; the push rod is movably arranged between the plugging piece and the fixed seat in a penetrating manner; the transmission rod is movably arranged on the fixing base in a penetrating mode, one end of the transmission rod is connected to the plugging piece, and the other end of the transmission rod movably abuts against the pushing rod; when the pushing rod moves in the axial direction, the transmission rod is driven by the pushing rod to move in the axial direction, at the moment, the blocking piece is driven by the transmission rod to approach the inner wall of the workpiece until the blocking piece is tightly attached to the inner side wall of the workpiece, the hollow part is sealed by the blocking piece, and in the process, the moving direction of the transmission rod and the blocking piece is opposite to the moving direction of the pushing rod; the plugging piece is tightly contacted with the relatively flat inner side wall of the workpiece to realize sealing, so that the complexity of the design of the plugging piece is prevented from being increased due to unevenness of the outer surface of the workpiece, and the production cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of airtightness testing technology, specifically relating to a sealing mechanism and an airtightness testing fixture. Background Technology

[0002] Air tightness testing, also known as leak testing or seal testing, is a process used to verify whether a product or component can prevent the leakage of gas (usually air). This testing method is widely used in many industries, including automotive manufacturing, medical devices, food packaging, electronic equipment, and aerospace, to ensure product quality and safety.

[0003] In the process of airtightness testing of workpieces, sealing the perforated areas on the workpiece's sidewalls is crucial. Current technology typically seals these perforations by ensuring a tight seal between the plug and the workpiece's outer surface. However, when the workpiece's outer surface has an uneven structure, the plug design needs to be more complex to ensure a perfect fit. This design not only increases production costs but also enhances the complexity of the manufacturing process. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is: to propose a sealing mechanism and a sealing fixture for airtightness testing, which, through the synergistic action of the pushing rod and the transmission rod, enables the sealing component to make close contact with the inner wall of the workpiece, thereby sealing the hollow part on the workpiece. This design avoids the complexity of the sealing component design caused by the unevenness of the outer surface of the workpiece, reduces production costs, and simplifies the manufacturing process.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a sealing mechanism for an airtightness testing fixture, comprising:

[0006] Fixed base;

[0007] A sealing component, which is movably connected to the fixed base and movably abuts against the inner wall of the workpiece, is used to seal the hollowed-out portion;

[0008] A push rod, which is movably disposed between the sealing member and the fixing seat;

[0009] A transmission rod is movably mounted on the fixed base, with one end of the transmission rod connected to the sealing member and the other end movably abutting against the push rod;

[0010] The transmission rod can be driven to move axially by the push rod due to the axial movement of the push rod, and the movement direction of the transmission rod is opposite to that of the push rod;

[0011] The sealing component can be pushed towards the inner wall of the workpiece by the transmission rod, and the direction of movement of the sealing component is opposite to the direction of movement of the transmission rod.

[0012] In the aforementioned sealing mechanism for an airtightness testing fixture, a rotating block is also provided on the fixed base. One end of the rotating block is hinged to the push rod, and the other end is movably abutted against the transmission rod. The push rod abuts against the transmission rod through the rotating block. The rotating block can rotate due to the axial movement of the push rod, thereby driving the transmission rod to move axially.

[0013] In the aforementioned sealing mechanism for an airtightness testing fixture, a support member is also provided on the fixed base, and the rotating block is rotatably connected to the support member.

[0014] In the aforementioned sealing mechanism for an airtightness testing fixture, the sealing mechanism further includes a first driving member, the output end of which is provided with a driving rod. The driving rod movably abuts against one end of the push rod, and the first driving member drives the push rod to move axially through the driving rod.

[0015] In the above-mentioned sealing mechanism for an airtightness testing fixture, the fixed base is provided with a through hole, and an elastic element is provided in the through hole. One end of the elastic element is connected to the sealing element. The elastic element can be stretched and undergo elastic deformation as the sealing element moves closer to the inner wall of the workpiece.

[0016] In the above-mentioned sealing mechanism for an airtightness testing fixture, a connector is also provided on the fixed base. The end of the elastic member away from the sealing member passes through the through hole and is connected to the connector. The connector abuts against the side wall of the fixed base. The connector is used to connect the end of the elastic member away from the sealing member to the fixed base.

[0017] The technical solution adopted by this utility model to solve its technical problem is to also propose an airtightness testing fixture, comprising:

[0018] The above-mentioned sealing mechanism for an airtightness testing fixture;

[0019] An operating table is provided with a fixed base plate, the fixed seat is provided on the fixed base plate, and the workpiece is placed on the fixed base plate;

[0020] A sealing assembly, disposed above the fixed base plate, is used to seal the upper end face of the workpiece;

[0021] A gas pipe connector is provided on the fixed base plate and connected to a gas source for supplying detection gas into the workpiece.

[0022] In the aforementioned airtightness testing fixture, a contour block is also provided on the fixed base plate, which is used to provide positioning for the workpiece.

[0023] In the aforementioned airtightness testing fixture, a first sealing ring is also provided on the fixed base plate. The first sealing ring movably abuts against the lower end face of the workpiece to provide a seal to the lower end face of the workpiece.

[0024] In the aforementioned airtightness testing fixture, the sealing assembly includes:

[0025] A sealing plate is movably disposed above the fixed base plate and movably abuts against the upper end surface of the workpiece;

[0026] The second sealing ring is disposed on the sealing plate and movably abuts against the upper end face of the workpiece to provide a seal to the upper end face of the workpiece.

[0027] A second driving component is disposed on the operating table. The sealing plate is connected to the output end of the second driving component. The second driving component is used to drive the sealing plate to move up and down in the vertical direction.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The push rod moves axially and the direction of the force is changed by the rotating block, so that the transmission rod can move in the opposite direction, and finally the sealing part moves closer to the inner wall of the workpiece and achieves effective sealing of the hollow part; the sealing part achieves sealing by closely contacting the relatively flat inner wall of the workpiece, avoiding the increase in the complexity of the sealing part design due to the uneven structure of the outer surface of the workpiece, reducing production costs, and reducing the complexity of the manufacturing process.

[0030] (2) One end of the elastic element is connected to the sealing element, and the other end is connected to the fixed seat. When the sealing element seals the hollow part, the elastic element is stretched and undergoes elastic deformation. After the workpiece completes the sealing test, the first driving element drives the driving rod away from the pushing rod. Due to the rebound force of the elastic element, the elastic element restores its original shape, driving the sealing element, transmission rod, rotating block and pushing rod to return to their initial positions, thus realizing automated control.

[0031] (3) The contour block and the first sealing ring on the fixed base plate provide precise positioning of the workpiece and sealing of the lower end face; the sealing plate and the second sealing ring in the sealing assembly ensure the sealing effect of the upper end face of the workpiece, realizing the comprehensive sealing of the upper and lower end faces and the hollowed-out parts of the side of the workpiece. In addition, the first driving component and the second driving component realize automated control, improving work efficiency and ease of operation. Attached Figure Description

[0032] Figure 1 This is a 3D view of the proposed solution.

[0033] Figure 2 yes Figure 1 Three-dimensional view of the middle section structure.

[0034] Figure 3 yes Figure 2 Three-dimensional view of the middle section structure;

[0035] Figure 4 yes Figure 3 A 3D view of the hidden connectors.

[0036] Figure 5 This is a 3D view of the sealing components in this solution.

[0037] In the diagram, 1. Fixed base; 2. Sealing component; 3. Push rod; 4. Transmission rod; 5. Rotating block; 6. Support component; 7. First driving component; 8. Driving rod; 9. Through hole; 10. Elastic component; 11. Connecting component; 12. Operating table; 13. Sealing assembly; 14. Fixed base plate; 15. Air pipe connector; 16. Contouring block; 17. First sealing ring; 18. Sealing plate; 19. Second sealing ring; 20. Second driving component. Detailed Implementation

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] like Figures 1 to 5 As shown, this solution provides a sealing mechanism for an airtightness testing fixture, used to seal the hollowed-out portion on the side wall of a workpiece. The sealing mechanism includes: a fixed base 1; a sealing element 2, which is movably connected to the fixed base 1 and movably abuts against the inner wall of the workpiece to seal the hollowed-out portion; a push rod 3, which movably passes between the sealing element 2 and the fixed base 1; and a transmission rod 4, which movably passes through the fixed base 1, with one end connected to the sealing element 2 and the other end movably abutting against the push rod 3. The transmission rod 4 can be driven to move axially by the push rod 3 due to the axial movement of the push rod 3, and the movement direction of the transmission rod 4 is opposite to that of the push rod 3. The sealing element 2 can be driven to move closer to the inner wall of the workpiece by the push rod 3 due to the push rod 4, and the movement direction of the sealing element 2 is opposite to that of the push rod 3.

[0041] When sealing the hollowed-out portion on the side wall of the workpiece, the push rod 3 moves axially, which drives the transmission rod 4 to move axially. The direction of movement of the transmission rod 4 is opposite to that of the push rod 3. Since the end of the transmission rod 4 away from the push rod 3 is connected to the sealing component 2, the movement of the transmission rod 4 causes the sealing component 2 to move towards the inner wall of the workpiece until the sealing component 2 is in close contact with the inner wall of the workpiece, thereby achieving effective sealing of the hollowed-out portion. When the outer surface of the workpiece has an uneven structure, sealing is achieved by making the sealing component 2 in close contact with the relatively flat inner side wall of the workpiece. This avoids increasing the design complexity of the sealing component 2 due to the complex structure of the outer surface of the workpiece. This design method not only reduces production costs but also reduces the complexity of the manufacturing process.

[0042] In order to enable the push rod 3 to effectively transmit force to the transmission rod 4, a rotating block 5 is rotatably provided on the fixed base 1. One end of the rotating block 5 is hinged to the push rod 3, and the other end is movably abutting against the transmission rod 4. Under this design, when the push rod 3 moves along its axial direction, it will drive one end of the rotating block 5 that is hinged to it to move, causing the rotating block 5 to rotate around its own axis. As the rotating block 5 rotates, its other end will apply a thrust to the transmission rod 4. This thrust causes the transmission rod 4 to move axially in the opposite direction to the push rod 3.

[0043] In order to achieve stable rotation of the rotating block 5 on the fixed base 1, a support member 6 is also provided on the fixed base 1. The rotating block 5 is connected to the support member 6. When the rotating block 5 is pushed by the push rod 3, it rotates around the connection point with the support member 6.

[0044] Specifically, when the push rod 3 moves away from the inner wall of the workpiece, it causes the rotating block 5 to rotate around its connection point with the support 6. This causes the other end of the rotating block 5 to push the transmission rod 4 closer to the inner wall of the workpiece. In this way, the transmission rod 4 moves towards the inner wall of the workpiece and pushes the sealing member 2 to move towards the inner wall of the workpiece in sync until the sealing member 2 is in close contact with the inner wall of the workpiece, thus completing the effective sealing of the hollow part.

[0045] To drive the push rod 3 to move axially, the sealing mechanism also includes a first driving member 7, whose output end is provided with a driving rod 8. The driving rod 8 movably abuts against one end of the push rod 3, and the first driving member 7 drives the push rod 3 to move axially through the driving rod 8. One end of the driving rod 8 and one end of the push rod 3 are tightly engaged through a contact surface, and the driving force of the first driving member 7 can be effectively transmitted to the push rod 3. The first driving member 7, through the action of the driving rod 8, makes the push rod 3 move smoothly along its axial direction, thereby achieving the predetermined axial movement. The first driving member 7 can be a hydraulic cylinder, a pneumatic cylinder, or a motor.

[0046] Furthermore, a through hole 9 is provided on the fixed base 1, and an elastic element 10 is provided inside the through hole 9. One end of the elastic element 10 is connected to the sealing element 2. When the first driving member 7 moves the pushing rod 3 axially through the driving rod 8, the pushing rod 3 will cause the rotating block 5 to rotate, thereby causing the transmission rod 4 to move axially in the opposite direction to the pushing rod 3, and finally pushing the sealing element 2 towards the inner wall of the workpiece. During this process, the elastic element 10 is stretched and undergoes elastic deformation. After the sealing test of the workpiece is completed, the first driving member 7 drives the driving rod 8 away from the pushing rod 3, so that the pushing rod 3 no longer... Driven by the driving rod 8, as the force exerted by the pushing rod 3 on the rotating block 5 disappears, the transmission rod 4 is no longer driven by the rotating block 5, causing the sealing member 2 to no longer be subjected to the clamping force. At this time, due to the rebound force of the elastic member 10, the elastic member 10 returns to its original shape, causing the sealing member 2 to move in the opposite direction away from the inner wall of the workpiece, and driving the transmission rod 4 to move in the opposite direction, thereby causing the rotating block 5 to rotate in the opposite direction. At this time, the rotating block 5 pushes the pushing rod 3 to move in the opposite direction. Finally, the sealing member 2, the transmission rod 4, the rotating block 5 and the pushing rod 3 all return to their initial positions; the elastic member 10 is preferably a spring.

[0047] In order to fix the end of the elastic element 10 away from the sealing element 2 to the fixed base 1, the fixed base 1 is also provided with a connector 11. The end of the elastic element 10 away from the sealing element 2 passes through the through hole 9 and is connected to the connector 11. The connector 11 firmly fixes one end of the elastic element 10 to the fixed base 1 by pressing against the side wall of the fixed base 1.

[0048] This solution also proposes an airtightness testing fixture, including: a sealing mechanism for an airtightness testing fixture as described above; an operating table 12, on which a fixed base plate 14 is provided, a fixed seat 1 is provided on the fixed base plate 14, and the workpiece is placed on the fixed base plate 14; a sealing assembly 13, which is provided above the fixed base plate 14, for sealing the upper end face of the workpiece; and a gas pipe connector 15, which is provided on the fixed base plate 14 and connected to a gas source, for supplying testing gas to flow into the workpiece.

[0049] The first driving component 7 is set on the operating table 12, and the fixed seat 1 is set on the fixed base plate 14. When the workpiece is placed on the fixed base plate 14, the driving rod 8 connected to the output end of the first driving component 7 and the sealing component 2 set on the fixed seat 1 are respectively located on the inner and outer sides of the hollow part on the workpiece. When sealing the hollow part of the workpiece, firstly, the first driving component 7 is started, which drives one end of the driving rod 8 to pass through the hollow part and abut against the push rod 3 inserted on the sealing component 2 and push the push rod 3 to move away from the hollow part. Through the force transmission of the rotating block 5 and the transmission rod 4, the sealing component 2 is driven to move towards the inner wall of the workpiece where the hollow part is located until the sealing component 2 is tightly attached to the inner wall of the workpiece, thereby completing the sealing of the hollow part.

[0050] During operation, the workpiece is fixed on the fixed base plate 14. The fixed base plate 14 provides positioning for the workpiece and seals the lower end face of the workpiece. The sealing assembly 13 seals the upper end face of the workpiece. The sealing component 2 in the sealing mechanism seals the hollow part on the side wall of the workpiece. After the workpiece is sealed, the air source fills the workpiece with test gas through the air pipe connector 15 on the fixed base plate 14 to perform air tightness testing on the workpiece.

[0051] In order to position the workpiece on the fixed base plate 14, a contour block 16 is also provided on the fixed base plate 14. The contour block 16 provides precise positioning for the workpiece by matching the internal shape of the workpiece.

[0052] In order to seal the lower end face of the workpiece, a first sealing ring 17 is provided on the fixed base plate 14. The first sealing ring 17 moves against the lower end face of the workpiece to achieve the sealing of the lower end face of the workpiece.

[0053] Furthermore, the sealing assembly 13 includes: a sealing plate 18, which is movably disposed above the fixed base plate 14 and movably abuts against the upper end face of the workpiece; a second sealing ring 19, which is disposed in the edge area where the sealing plate 18 contacts the workpiece, for sealing the upper end face of the workpiece; and a second driving member 20, which is disposed on the operating table 12, with the sealing plate 18 connected to the output end of the second driving member 20, and the second driving member 20 used to drive the sealing plate 18 to move up and down in the vertical direction.

[0054] In the initial state, the second driving member 20 drives the sealing plate 18 to rise vertically, away from the fixed base plate 14, so that the workpiece can be placed on the fixed base plate 14. After the workpiece is placed on the fixed base plate 14, the second driving member 20 drives the sealing plate 18 to fall vertically, so that the sealing plate 18 contacts the upper surface of the workpiece. At the same time, the second sealing ring 19 is tightly fitted with the upper surface of the workpiece to ensure the airtightness of the upper end face of the workpiece. The second driving member 20 can be a motor, a hydraulic cylinder or a pneumatic cylinder.

[0055] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0057] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sealing mechanism for an airtightness testing fixture, used to seal a hollowed-out portion on the side wall of a workpiece, characterized in that, The blocking mechanism includes: Fixed base; A sealing component, which is movably connected to the fixed base and movably abuts against the inner wall of the workpiece, is used to seal the hollowed-out portion; A push rod, which is movably disposed between the sealing member and the fixing seat; A transmission rod is movably mounted on the fixed base, with one end of the transmission rod connected to the sealing member and the other end movably abutting against the push rod; The transmission rod can be driven to move axially by the push rod due to the axial movement of the push rod, and the movement direction of the transmission rod is opposite to that of the push rod; The sealing component can be pushed towards the inner wall of the workpiece by the transmission rod, and the direction of movement of the sealing component is opposite to the direction of movement of the transmission rod.

2. The sealing mechanism for an airtightness testing fixture as described in claim 1, characterized in that, The fixed base is also provided with a rotating block. One end of the rotating block is hinged to the push rod, and the other end is movably abutted against the transmission rod. The push rod abuts against the transmission rod through the rotating block. The rotating block can rotate due to the axial movement of the push rod, thereby driving the transmission rod to move axially.

3. The sealing mechanism for an airtightness testing fixture as described in claim 2, characterized in that, The fixed base is also provided with a support member, and the rotating block is rotatably connected to the support member.

4. The sealing mechanism for an airtightness testing fixture as described in claim 1, characterized in that, The blocking mechanism also includes a first driving member, the output end of which is provided with a driving rod. The driving rod is movably abutted against one end of the pushing rod, and the first driving member drives the pushing rod to move axially through the driving rod.

5. The sealing mechanism for an airtightness testing fixture as described in claim 1, characterized in that, The fixed base is provided with a through hole, and an elastic element is provided in the through hole. One end of the elastic element is connected to the sealing element. The elastic element can be stretched and undergo elastic deformation as the sealing element moves closer to the inner wall of the workpiece.

6. The sealing mechanism for an airtightness testing fixture as described in claim 5, characterized in that, The fixed base is also provided with a connector. The end of the elastic member away from the sealing member passes through the through hole and is connected to the connector. The connector abuts against the side wall of the fixed base. The connector is used to connect the end of the elastic member away from the sealing member to the fixed base.

7. An airtightness testing fixture, characterized in that, include: A sealing mechanism for an airtightness testing fixture as described in any one of claims 1 to 6; An operating table is provided with a fixed base plate, the fixed seat is provided on the fixed base plate, and the workpiece is placed on the fixed base plate; A sealing assembly, disposed above the fixed base plate, is used to seal the upper end face of the workpiece; A gas pipe connector is provided on the fixed base plate and connected to a gas source for supplying detection gas into the workpiece.

8. The airtightness testing fixture as described in claim 7, characterized in that, The fixed base plate is also provided with a contour block, which is used to provide positioning for the workpiece.

9. The airtightness testing fixture as described in claim 7, characterized in that, The fixed base plate is also provided with a first sealing ring, which movably abuts against the lower end face of the workpiece to provide a seal to the lower end face of the workpiece.

10. The airtightness testing fixture as described in claim 7, characterized in that, The sealing assembly includes: A sealing plate is movably disposed above the fixed base plate and movably abuts against the upper end surface of the workpiece; The second sealing ring is disposed on the sealing plate and movably abuts against the upper end face of the workpiece to provide a seal to the upper end face of the workpiece. A second driving component is disposed on the operating table. The sealing plate is connected to the output end of the second driving component. The second driving component is used to drive the sealing plate to move up and down in the vertical direction.

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