Pressing device for air tightness detection

Abstract

The utility model discloses a pressing device for air tightness detection, which comprises a detection table, a supporting seat arranged above the detection table, an object placing plate arranged above the supporting seat, a compression spring arranged below the object placing plate, a first stand column arranged on one side of the supporting seat, and a second stand column arranged on the other side of the supporting seat. A second telescopic cavity is formed in the first stand column, a second stand column is arranged above the first stand column, a second electric push rod is arranged in the second telescopic cavity, a first connecting plate is arranged above the second stand column, and a second connecting plate is arranged on one side of the first connecting plate; rubber blocks are arranged above the object placing plate and below the other end of the second connecting plate, a pressing mechanism of the pressing device is formed by combining a plurality of parts, the rubber blocks are in contact with a workpiece, stressed and deformed to be fully attached to the contact face of the workpiece, the pressed workpiece can be buffered, the detected workpiece is protected, and the detection accuracy is improved. And the pressing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, specifically to a clamping device for airtightness testing. Background Art

[0002] Airtightness testing is a technical means to ensure that products or equipment maintain their sealing performance during use, preventing leakage of gases, liquids, or other media, thereby guaranteeing the safe and stable operation of the products or equipment. Commonly used methods include differential pressure method, flow rate method, tracer gas method, pressure decay method, and negative pressure vacuum testing method. These methods are widely used in the tightness and integrity assessment of aircraft, automobile shells, ships, and internal containers, and are quality control applications developed for transportation, military, and basic industries to improve the airtightness of vehicles, aircraft, ships, etc.

[0003] Chinese Patent Publication No. CN220322639U, authorized on January 9, 2024, discloses a clamping device for testing the airtightness of a workpiece. The device includes a base plate, a workpiece body, a screw plug seat, and side plates fixedly installed on both sides of the top of the base plate. A top plate is fixedly connected to the top of the side plates. A lower disc is rotatably connected to the middle of the top of the base plate. A support plate is installed above the lower disc. A placement box is fixedly connected to the top of the support plate. A brush is installed on one side of the support plate. The device also includes: an elastic sealing ring connected to the inner bottom surface of the placement box; sleeves symmetrically fixed to the top of the lower disc, with stepped grooves inside the sleeves; and sliding rods symmetrically fixed to the bottom of the support plate. An upper disc is rotatably connected to one side of the bottom of the top plate, and hydraulic cylinders are symmetrically installed on the bottom of the upper disc. This invention solves the problem that the device is not easy to visually observe the specific location of air holes, causing trouble for subsequent rework operations and having certain limitations, thus improving the practicality of the device.

[0004] Existing clamping devices clamp and fix the workpiece to be tested. The clamping mechanism is in direct and rigid contact with the workpiece, which is relatively tight. The clamped workpiece does not have a buffer protection function. During the testing process, the workpiece is prone to local over-clamping, deformation and damage, which reduces the clamping effect and cannot meet the usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a clamping device for airtightness testing, in order to solve the problems mentioned in the background art. The existing clamping device clamps and fixes the workpiece to be tested. The clamping mechanism is in direct hard contact with the workpiece, which is relatively tight. The clamped workpiece does not have a buffer protection function. During the testing process, the workpiece is easily over-clamped in some areas, causing deformation and damage, reducing the clamping effect and failing to meet the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a clamping device for airtightness testing, comprising a testing platform, a support base disposed above the testing platform and fixedly connected to the testing platform, a shelf disposed above the support base, and two compression springs disposed below the shelf, the ends of which are fixedly connected to the support base and the shelf respectively. A sliding groove is provided at the upper end of the testing platform, and a first column is provided on one side of the support base. The lower end of the first column extends into the sliding groove and is slidably connected to the testing platform. A second telescopic cavity is provided inside the first column, and a [missing information - likely a device or structure] is provided above the first column. The second column has its lower end extending into the interior of the second telescopic cavity and is slidably connected to the first column. A second electric actuator is installed inside the second telescopic cavity, and both ends of the second electric actuator are fixedly connected to the first column and the second column, respectively. A first connecting plate is installed above the second column and is fixedly connected to the second column. The first connecting plate has a first telescopic cavity inside it. A second connecting plate is installed on one side of the first connecting plate, with one end of the second connecting plate extending into the interior of the first telescopic cavity and slidably connected to the first connecting plate. Rubber blocks are installed above the shelf and below the other end of the second connecting plate.

[0007] Preferably, the upper end of the shelf and the lower end of the second connecting plate are both provided with connecting protrusions, and the connecting protrusions are fixedly connected to the shelf and the second connecting plate. The back of the rubber block is provided with a connecting groove, and the connecting protrusions are correspondingly provided with the connecting grooves. The connecting protrusions are slidably connected with the rubber block, and the cross-sections of both the connecting protrusions and the rubber block are trapezoidal.

[0008] Preferably, a pressure sensor is provided at the center of the rubber block, and the pressure sensor is fixedly connected to the rubber block.

[0009] Preferably, the support base is provided with guide holes, there are two guide holes, and the guide holes are corresponding to the compression springs. Each of the two compression springs is provided with a guide rod, one end of which is fixedly connected to the shelf, and the other end of which extends into the guide hole. The guide rod is slidably connected to the support base and the compression spring.

[0010] Preferably, a motor is provided on one side of the testing platform, and the motor is connected to the testing platform by screws. A lead screw is provided inside the slide groove, and one end of the lead screw is connected to the output end of the motor. The lead screw is threadedly connected to the first column and rotatably connected to the testing platform. Four support legs are provided below the testing platform, and the support legs are connected to the testing platform by screws. The four support legs are located at the four corners of the testing platform.

[0011] Preferably, a first electric push rod is provided inside the first telescopic cavity, and the first electric push rod is located on one side of the second connecting plate. The first electric push rod is fixedly connected to the first connecting plate and the second connecting plate.

[0012] Preferably, the inner walls of the slide groove, the first telescopic cavity and the second telescopic cavity are all provided with ball bearings, and the ball bearings are in rolling connection with the testing table, the first column and the first connecting plate. The side walls of the first column, the second column and the second connecting plate are all provided with roller grooves, and the ball bearings are correspondingly arranged with the roller grooves.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This utility model device comprises a support base, a placement plate, a rubber block, a first column, a second column, a second electric push rod, a second connecting plate, a pressure sensor, and a compression spring. The workpiece is placed on the rubber block above the placement plate. The second electric push rod drives the second column to descend, causing the second connecting plate to fall and bringing the rubber block below the second connecting plate into contact with the upper end of the workpiece, applying pressure to the workpiece and achieving workpiece clamping. The rubber block changes accordingly when it comes into contact with the workpiece and is subjected to pressure, fully adhering to the surface of the clamped workpiece. The placement plate and the support base are connected by a guide rod and a compression spring, giving the placement plate a buffering effect. The pressure sensor measures the pressure applied to the workpiece, facilitating control of the clamping force and protecting the clamped workpiece from excessive clamping and deformation.

[0015] 2. This utility model device, through the setting of connecting protrusion and connecting groove, allows the connecting protrusion to be aligned with the connecting groove and inserted, quickly installing the rubber block and facilitating the replacement of the corresponding rubber block;

[0016] 3. This utility model device, through the arrangement of a slide groove, a motor, a lead screw, and a first electric push rod, allows the motor to drive the lead screw to rotate. As the lead screw rotates, it causes the first column to slide along the slide groove, thus translating the clamping mechanism. The first electric push rod drives the second connecting plate to extend and retract, changing the extension length of the second connecting plate. This can meet the clamping requirements of workpieces of different sizes and improve the clamping effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 For the present utility model Figure 2 A magnified view of a portion of area A;

[0020] Figure 4This is a diagram showing the connection relationship between the testing platform, the first column, the second column, the first connecting plate, and the second connecting plate of this utility model.

[0021] In the diagram: 1. Testing platform; 2. Support leg; 3. Support base; 4. Shelf; 5. Rubber block; 6. Slide groove; 7. First column; 8. Second column; 9. First connecting plate; 10. Second connecting plate; 11. Roller groove; 12. Motor; 13. Lead screw; 14. Connecting protrusion; 15. First electric actuator; 16. First telescopic cavity; 17. Ball bearing; 18. Pressure sensor; 19. Second telescopic cavity; 20. Second electric actuator; 21. Guide hole; 22. Guide rod; 23. Compression spring; 24. Connecting groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Please see Figure 1-4This utility model provides an embodiment of a clamping device for airtightness testing, comprising a testing platform 1, a support base 3 fixedly connected to the testing platform 1 above the testing platform 1, a shelf 4 above the support base 3, and two compression springs 23 below the shelf 4, with their ends fixedly connected to the support base 3 and the shelf 4 respectively. A sliding groove 6 is provided at the upper end of the testing platform 1. A first column 7 is provided on one side of the support base 3, with its lower end extending into the sliding groove 6 and slidably connected to the testing platform 1. A second telescopic cavity 19 is provided inside the first column 7. A second column 8 is provided above the first column 7, with its lower end extending into the second telescopic cavity 19 and slidably connected to the first column 7. A second electric push rod 20 is provided inside the second telescopic cavity 19, with its ends connected to the first column 7 and the second column 8 respectively. 8. A first connecting plate 9 is fixedly connected to the second column 8 above the second column 8. A first telescopic cavity 16 is provided inside the first connecting plate 9. A second connecting plate 10 is provided on one side of the first connecting plate 9. One end of the second connecting plate 10 extends into the interior of the first telescopic cavity 16, and the second connecting plate 10 is slidably connected to the first connecting plate 9. Rubber blocks 5 are provided above the shelf 4 and below the other end of the second connecting plate 10. A pressure sensor 18 is provided at the center of the rubber block 5, and the pressure sensor 18 is fixedly connected to the rubber block 5. A guide hole 21 is provided on the support base 3. There are two guide holes 21, and the guide holes 21 are corresponding to the compression springs 23. A guide rod 22 is provided inside each of the two compression springs 23. One end of the guide rod 22 is fixedly connected to the shelf 4, and the other end of the guide rod 22 extends into the interior of the guide hole 21. The guide rod 22 is slidably connected to the support base 3 and the compression springs 23.

[0024] In use: Place the workpiece to be tested on the rubber block 5 above the placement plate 4, drive the second electric push rod 20 to drive the second column 8 to descend. As the second column 8 descends, the second connecting plate 10 falls down, and the rubber block 5 below the second connecting plate 10 contacts the upper end of the workpiece, applying pressure to the workpiece to achieve workpiece clamping. The placement plate 4 and the support base 3 are connected by the guide rod 22 and the compression spring 23, so that the placement plate 4 has a buffering effect. The pressure sensor 18 measures the pressure applied to the workpiece, which facilitates the control of the clamping force and protects the clamped workpiece, preventing the workpiece from being deformed due to excessive clamping.

[0025] Please see Figure 1 and Figure 3The upper end of the shelf 4 and the lower end of the second connecting plate 10 are both provided with connecting protrusions 14, and the connecting protrusions 14 are fixedly connected to the shelf 4 and the second connecting plate 10. The back of the rubber block 5 is provided with a connecting groove 24, and the connecting protrusions 14 are correspondingly provided with the connecting groove 24. The connecting protrusions 14 and the rubber block 5 are slidably connected, and the cross sections of the connecting protrusions 14 and the rubber block 5 are both trapezoidal. The connecting protrusions 14 are aligned with the connecting groove 24 and inserted to quickly install the rubber block 5. The rubber block 5 changes accordingly when it is pressed, and fully fits the surface of the pressed workpiece to improve the workpiece pressing effect.

[0026] Please see Figure 1 , Figure 2 and Figure 4 A motor 12 is installed on one side of the testing platform 1, and the motor 12 is connected to the testing platform 1 by screws. A lead screw 13 is installed inside the slide groove 6, and one end of the lead screw 13 is connected to the output end of the motor 12. The lead screw 13 is threadedly connected to the first column 7, and the lead screw 13 is rotatably connected to the testing platform 1. Support legs 2 are installed below the testing platform 1. There are four support legs 2, and the support legs 2 are connected to the testing platform 1 by screws. The four support legs 2 are located at the four corners of the testing platform 1. A first electric push rod 15 is installed inside the first telescopic cavity 16, and the first electric push rod 15 is located on one side of the second connecting plate 10. The first electric push rod 15 is connected to the first connecting plate 10. Plate 9 and the second connecting plate 10 are fixedly connected. Roller balls 17 are provided on the inner walls of the slide groove 6, the first telescopic cavity 16 and the second telescopic cavity 19. The roller balls 17 are tumbling connected to the detection table 1, the first column 7 and the first connecting plate 9. Roller grooves 11 are provided on the side walls of the first column 7, the second column 8 and the second connecting plate 10. The roller balls 17 are correspondingly arranged with the roller grooves 11. The motor 12 drives the lead screw 13 to rotate. As the lead screw 13 rotates, it drives the first column 7 to slide along the slide groove 6, thus translating the clamping mechanism. The first electric push rod 15 drives the second connecting plate 10 to extend and retract, changing the extension length of the second connecting plate 10, which can meet the clamping requirements of workpieces of different sizes.

[0027] Working principle: The workpiece to be tested is first placed on the rubber block 5 above the placement plate 4. The second electric push rod 20 drives the second column 8 to descend. As the second column 8 descends, the second connecting plate 10 falls down, and the rubber block 5 below the second connecting plate 10 contacts the upper end of the workpiece, applying pressure to the workpiece to achieve workpiece clamping. The rubber block 5 changes accordingly when it comes into contact with the workpiece and is pressed, fully adhering to the surface of the clamped workpiece. The placement plate 4 and the support base 3 are connected by the guide rod 22 and the compression spring 23, so that the placement plate 4 has a buffering effect. The pressure sensor 18 measures the pressure applied to the workpiece, which facilitates the control of the clamping force and protects the clamped workpiece from deformation due to excessive clamping. The motor 12 drives the lead screw 13 to rotate. As the lead screw 13 rotates, it drives the first column 7 to slide along the slide groove 6, translating the clamping mechanism. The first electric push rod 15 drives the second connecting plate 10 to extend and retract, changing the extension length of the second connecting plate 10, which can meet the clamping requirements of workpieces of different sizes.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art. It should also be noted that the air supply device for air tightness testing disclosed in this utility model has a wide range of applications, including but not limited to clamping devices for air tightness testing.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping device for airtightness testing, comprising a testing platform (1), characterized in that: A support base (3) is provided above the testing platform (1), and the support base (3) is fixedly connected to the testing platform (1). A shelf (4) is provided above the support base (3), and a compression spring (23) is provided below the shelf (4). There are two compression springs (23), and the two ends of the compression springs (23) are fixedly connected to the support base (3) and the shelf (4) respectively. A sliding groove (6) is provided at the upper end of the testing platform (1). A first column (7) is provided on one side of the support base (3). The lower end of the first column (7) extends into the interior of the sliding groove (6), and the first column (7) is slidably connected to the testing platform (1). A second telescopic cavity (19) is provided inside the first column (7). A second column (8) is provided above the first column (7), and the lower end of the second column (8) extends into the second telescopic cavity (19). The second telescopic cavity (19) is located inside the second telescopic cavity (19), and the second column (8) is slidably connected to the first column (7). The second telescopic cavity (19) is provided with a second electric push rod (20), and the two ends of the second electric push rod (20) are fixedly connected to the first column (7) and the second column (8) respectively. The second column (8) is provided with a first connecting plate (9) above it, and the first connecting plate (9) is fixedly connected to the second column (8). The first connecting plate (9) is provided with a first telescopic cavity (16) inside it. The first connecting plate (9) is provided with a second connecting plate (10) on one side. One end of the second connecting plate (10) extends into the interior of the first telescopic cavity (16), and the second connecting plate (10) is slidably connected to the first connecting plate (9). Rubber blocks (5) are provided above the shelf (4) and below the other end of the second connecting plate (10).

2. The clamping device for airtightness testing according to claim 1, characterized in that: The upper end of the shelf (4) and the lower end of the second connecting plate (10) are both provided with connecting protrusions (14), and the connecting protrusions (14) are fixedly connected to the shelf (4) and the second connecting plate (10). The back of the rubber block (5) is provided with a connecting groove (24), and the connecting protrusions (14) are correspondingly provided with the connecting grooves (24). The connecting protrusions (14) are slidably connected with the rubber block (5), and the cross sections of the connecting protrusions (14) and the rubber block (5) are both trapezoidal.

3. The clamping device for airtightness testing according to claim 1, characterized in that: A pressure sensor (18) is provided at the center of the rubber block (5), and the pressure sensor (18) is fixedly connected to the rubber block (5).

4. The clamping device for airtightness testing according to claim 1, characterized in that: The support base (3) is provided with guide holes (21). There are two guide holes (21), and the guide holes (21) are corresponding to the compression springs (23). The two compression springs (23) are provided with guide rods (22) inside. One end of the guide rod (22) is fixedly connected to the shelf (4), and the other end of the guide rod (22) extends into the guide hole (21). The guide rod (22) is slidably connected to the support base (3) and the compression springs (23).

5. A clamping device for airtightness testing according to claim 1, characterized in that: A motor (12) is provided on one side of the testing platform (1), and the motor (12) is connected to the testing platform (1) by screws. A lead screw (13) is provided inside the slide groove (6), and one end of the lead screw (13) is connected to the output end of the motor (12). The lead screw (13) is threadedly connected to the first column (7), and the lead screw (13) is rotatably connected to the testing platform (1). A support leg (2) is provided below the testing platform (1). There are four support legs (2), and the support legs (2) are connected to the testing platform (1) by screws. The four support legs (2) are located at the four corners of the testing platform (1).

6. The clamping device for airtightness testing according to claim 1, characterized in that: The first telescopic cavity (16) is provided with a first electric push rod (15), and the first electric push rod (15) is located on one side of the second connecting plate (10). The first electric push rod (15) is fixedly connected to the first connecting plate (9) and the second connecting plate (10).

7. The clamping device for airtightness testing according to claim 1, characterized in that: The inner walls of the slide (6), the first telescopic cavity (16) and the second telescopic cavity (19) are all provided with ball bearings (17), and the ball bearings (17) are tumblingly connected to the detection table (1), the first column (7) and the first connecting plate (9). The side walls of the first column (7), the second column (8) and the second connecting plate (10) are all provided with roller grooves (11), and the ball bearings (17) are correspondingly provided with the roller grooves (11).

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