Air tightness testing apparatus

Abstract

The application discloses airtightness testing equipment. The airtightness testing equipment comprises a driver, a first connecting piece, a pressing piece and a buffer assembly. The first connecting piece is connected with an output shaft of the driver; the pressing piece is located on the side, away from the driver, of the first connecting piece and is used for pressing a workpiece; the buffer assembly is located between the first connecting piece and the pressing piece and is connected with the first connecting piece and the pressing piece; the buffer assembly comprises an elastic piece arranged in an axial direction and a pressure sensor, the elastic piece is used for buffering the pressure between the first connecting piece and the pressing piece, and the pressure sensor is used for detecting the pressure. The airtightness testing equipment provided by the application improves the detection precision of the cylinder pressure and further improves the airtightness testing precision.

Description

Technical Field

[0001] This application relates to the field of airtightness testing technology, and in particular to an airtightness testing device. Background Technology

[0002] With the development of the electronics industry, 3C products (computers, communication devices, and consumer electronics) have become a hot area in product design. To improve the reliability, safety, and lifespan of 3C products in complex environments, they have high requirements for airtightness.

[0003] Air tightness testing equipment is used to test the air tightness of 3C products and their components. In related technologies, air tightness testing equipment directly drives the sealing component with a cylinder to achieve sealing of the workpiece under test. However, the pressure of the cylinder is not easy to control; too high or too low pressure will affect the accuracy of the air tightness test. Utility Model Content

[0004] The main objective of this application is to propose an airtightness testing device, which aims to improve the airtightness testing accuracy by improving the cylinder pressure detection accuracy.

[0005] To achieve the above objectives, this application proposes an airtightness testing device, which includes: drive; The first connector is connected to the output shaft of the driver; A clamping component is located on the side of the first connector away from the driver and is axially movable to the first connector for clamping the workpiece. A buffer assembly is located between the first connector and the clamping member, and is connected to the first connector and the clamping member; the buffer assembly includes an elastic element and a pressure sensor arranged along the axial direction, the elastic element is used to buffer the pressure between the first connector and the clamping member, and the pressure sensor is used to detect the pressure.

[0006] In some embodiments, the buffer assembly further includes a second connector, a plurality of elastic elements are circumferentially disposed on one side of the second connector, and the pressure sensor is disposed on the other side of the second connector.

[0007] In some embodiments, the buffer assembly further includes a limiting member located between the first connector and the second connector, the limiting member being used to limit the distance between the first connector and the second connector.

[0008] In some embodiments, one end of the elastic member is connected to the first connecting member, and the other end is connected to the second connecting member; The end of the pressure sensor facing away from the elastic element is connected to the clamping element.

[0009] In some embodiments, the buffer assembly further includes a first guide member, one end of which is connected to the second connector member, and the first connector member has a first guide hole that engages with the first guide member.

[0010] In some embodiments, the elastic element is a cylindrical helical spring, and the first guide element is located inside the cylindrical helical spring.

[0011] In some embodiments, the buffer assembly further includes a second guide member, one end of which is connected to the clamping member, and the first connector also has a second guide hole that engages with the second guide member.

[0012] In some embodiments, the second connector has a third guide hole for engaging with the second guide, the second guide passing through the second connector and the first connector; Linear motion supports are provided at the second guide hole and the third guide hole, and the linear motion supports are used to cooperate with the second guide member.

[0013] In some embodiments, it also includes The base assembly is located on the side of the clamping member opposite to the driver and is used to cooperate with the clamping member to clamp the workpiece; The fixture assembly includes a first fixture disposed on the clamping member and a second fixture disposed on the base assembly; the first fixture has a groove for accommodating a workpiece, the groove and the second fixture forming a sealed space.

[0014] In some embodiments, the base assembly includes Sliding mechanism; A sliding platform, slidably disposed on the sliding mechanism, is used to set the second fixture; A barcode scanning component, located on the sliding mechanism, is used to record workpiece information on the second fixture.

[0015] The beneficial effects of the technical solution of this application are as follows: when the driver works, it transmits the downward pressure to the first connecting member through the output shaft. The downward pressure of the first connecting member is transmitted to the clamping member through the buffer assembly. The clamping member presses down to achieve a seal on the workpiece or fixture. The elastic element of the buffer assembly and the pressure sensor improve the detection accuracy of the downward pressure. The pressure change curve is smooth, which effectively improves the precise control of the downward pressure and thus improves the airtightness detection accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an airtightness testing device according to an embodiment of this application; Figure 2 for Figure 1 A magnified view of part A in the image. Detailed Implementation

[0017] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application 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.

[0019] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0020] Furthermore, the use of terms such as "first" and "second" in this application 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 that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0021] Currently, existing airtightness testing devices achieve sealing of the workpiece by directly driving the sealing element with a cylinder. However, the pressure of the cylinder is not easy to control, and its pressure change curve is steep. Excessive or insufficient pressure output by the cylinder will affect the accuracy of the airtightness test.

[0022] Therefore, referring to Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of an airtightness testing device according to an embodiment of this application. Figure 2 for Figure 1 A partial enlarged view of A in this application shows the airtightness testing equipment provided in this embodiment, which includes... Drive 2; The first connector 3 is connected to the output shaft of the driver 2; The clamping component 4 is located on the side of the first connecting component 3 away from the driver 2, and is used to clamp the workpiece; The buffer assembly 5 is located between the first connector 3 and the clamping member 4 and is connected to the first connector 3 and the clamping member 4. The buffer assembly 5 includes an elastic member 51 and a pressure sensor 52 arranged along the axial direction. The elastic member 51 is used to buffer the pressure between the first connector 3 and the clamping member 4, and the pressure sensor 52 is used to detect the pressure.

[0023] In this embodiment, the actuator 2 can be a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, etc. Figure 1 As shown, a cylinder is selected as the actuator 2. The airtightness testing equipment also includes a bracket, which is mounted on the machine base 1 for fixation. The actuator 2 is mounted on the top of the bracket, and the output shaft of the actuator 2 extends downward through the bracket.

[0024] In this embodiment of the application, the first connecting member 3 can be a square plate, a circular plate, etc. Figure 2 As shown, a square plate is selected as the first connecting member 3. The first connecting member 3 is connected to the output shaft of the driver 2 by bolts to achieve relative fixation between the first connecting member 3 and the output shaft of the driver 2, and the downward pressure output by the driver 2 is transmitted to the first connecting member 3.

[0025] In this embodiment, the clamping member 4 can be a square plate, a circular plate, etc. Figure 2 As shown, a square plate is selected as the clamping element 4. The shape of the clamping element 4 corresponds to the first connecting element 3, which can improve the force balance between the clamping element 4 and the first connecting element 3. The clamping element 4 is located between the first connecting element 3 and the machine base 1, and is used to clamp the workpiece. It can be understood that the clamping element 4 generally clamps the workpiece by installing a fixture, in conjunction with the structure on the machine base 1 for fixing the fixture, and the workpiece is placed in the contour groove of the fixture.

[0026] In this embodiment, the buffer assembly 5 is located between and connected to the first connecting member 3 and the clamping member 4. The elastic element 51 and the pressure sensor 52 of the buffer assembly 5 are arranged sequentially along the axial direction. The elastic element 51 and the pressure sensor 52 can be directly connected or indirectly connected. The downward pressure from the first connecting member 3 is transmitted to the clamping member 4 through the buffer assembly 5. The elastic element 51 buffers the downward pressure, making the pressure curve smoother. Combined with the pressure sensor 52 to detect the downward pressure, this effectively improves the detection accuracy of the downward pressure.

[0027] The elastic element 51 can be a cylindrical helical spring, a butterfly spring, or a rubber elastic column, etc.

[0028] It is understood that the elastic element 51 can be connected to the first connecting element 3, and the pressure sensor 52 can be connected to the clamping element 4; or the elastic element 51 can be connected to the clamping element 4, and the pressure sensor 52 can be connected to the first connecting element 3. That is, the axial arrangement of the elastic element 51 and the pressure sensor 52 is not uniquely limited, and both of the above arrangements can achieve the technical effect.

[0029] The working principle of the airtightness testing device in this application embodiment can be briefly described as follows: Before the clamping part 4 contacts the machine base 1 or the fixture: the driver 2 drives the first connecting part 3 to move downward toward the machine base 1. Since the clamping part 4 is connected to the first connecting part 3 through the buffer assembly 5, the clamping part 4 and the first connecting part 3 move downward synchronously. When the clamping component 4 contacts the machine base 1 or fixture, the clamping component 4 stops, the first connecting component 3 continues to press down under the drive of the driver 2, the elastic element 51 of the buffer assembly 5 is compressed, the pressure sensor 52 of the buffer assembly 5 detects the downward pressure, until the downward pressure reaches the predetermined value, the driver 2 stops working, and the clamping component 4 remains in the clamping state.

[0030] In this embodiment, under the buffering effect of the elastic element 51, the pressure applied to the workpiece or fixture by the clamping element 4 increases slowly, making the workpiece or fixture less prone to wear, and ensuring good sealing performance of the clamping element 4. Furthermore, the elastic element 51, in conjunction with the pressure sensor 52, allows the downward pressure applied to the workpiece or fixture by the clamping element 4 to be accurately detected. When the downward pressure is at an appropriate value, the actuator 2 can be accurately controlled to stop working, reducing the probability of excessive or insufficient pressure, thereby improving the accuracy of airtightness detection.

[0031] Reference Figure 2 As shown in the embodiment of this application, the buffer assembly 5 further includes a second connector 53, a plurality of elastic members 51 are circumferentially disposed on one side of the axial direction of the second connector 53, and a pressure sensor 52 is disposed on the other side of the second connector 53.

[0032] The second connector 53 can be a square plate, a round plate, etc. For example... Figure 1 As shown, a square plate is selected as the second connector 53. The shape of the second connector 53 corresponds to the first connector 3 and the clamping member 4, which can improve the overall force balance of the buffer assembly 5.

[0033] Specifically, four elastic elements 51 can be provided and arranged circumferentially on one side of the second connector 53. The pressure sensor 52 is provided on the other side of the second connector 53 and is located in the middle of the second connector 53. This design can make the detection result of the pressure sensor 52 more accurate and reduce the inaccuracy caused by the tilt of the pressing angle of the clamping member 4 (compared to the way the elastic element 51 is directly connected to the clamping member 4).

[0034] Reference Figure 2 As shown in the embodiment of this application, the buffer component 5 further includes a limiting member 54, which is located between the first connecting member 3 and the second connecting member 53. The limiting member 54 is used to limit the distance between the first connecting member 3 and the second connecting member 53.

[0035] It is understandable that the limiting member 54 can adopt any shape, preferably a circular limiting post.

[0036] Specifically, the limiting member 54 can be installed on the first connecting member 3. In the initial state of the elastic member 51, there is a certain distance between the limiting member 54 and the second connecting member 53. The limiting member 54 acts as a safety device. When the first connecting member 3 is pressed down and the elastic member 51 is compressed to a certain extent, the limiting member 54 abuts against the second connecting member 53, the first connecting member 3 stops pressing down, the buffer assembly 5 remains in its current state, and thus the clamping member 4 maintains its current sealing state against the workpiece or fixture.

[0037] Reference Figure 2 As shown in the embodiment of this application, one end of the elastic member 51 is connected to the first connecting member 3, and the other end is connected to the second connecting member 53; the end of the pressure sensor 52 facing away from the elastic member 51 is connected to the clamping member 4.

[0038] Specifically, the pressure sensor 52 is directly connected to the clamping member 4, enabling more direct detection of the pressure applied to the workpiece or fixture by the clamping member 4. For example, when the pressure sensor 52 is directly connected to the first connecting member 3, and one end of the elastic member 51 is directly connected to the clamping member 4 while the other end is connected to the pressure sensor 52 via the second connecting member 53, the pressure directly detected by the pressure sensor 52 is the pressure applied by the first connecting member 3. If the elastic member 51 experiences angular displacement during compression, the pressure sensor 52 cannot directly detect the pressure applied to the workpiece or fixture by the clamping member 4, leading to reduced accuracy of the detection results. The above design effectively reduces the impact of the elastic member 51 compression angle displacement on the detection results.

[0039] Reference Figure 2 As shown in the embodiment of this application, the buffer assembly 5 further includes a first guide member 55, one end of which is connected to a second connector 53, and the first connector 3 has a first guide hole that cooperates with the first guide member 55.

[0040] Specifically, the first guide member 55 is a guide rod. The first guide member 55 passes through the first guide hole and moves axially along the first guide hole. The first guide member 55 can limit the movement direction of the second connector 53 relative to the first connector 3, so that the movement direction of the second connector 53 is consistent with that of the first connector 3, reducing the possibility of deviation during the movement of the second connector 53, and making the force transmitted along the preset path, which is more stable and linear.

[0041] Reference Figure 2 As shown in the embodiment of this application, the elastic element 51 is a cylindrical helical spring, and the first guide element 55 is located inside the cylindrical helical spring.

[0042] Specifically, the elastic element 51 adopts a cylindrical helical spring, which, together with the first guide element 55, can achieve compression deformation along a straight direction, reducing the force deviation during the compression process of the elastic element 51 and improving the detection accuracy of the pressure sensor 52.

[0043] Reference Figure 2 As shown in the embodiment of this application, the buffer assembly 5 further includes a second guide member 56, one end of which is connected to the clamping member 4, and the first connecting member 3 also has a second guide hole that cooperates with the second guide member 56.

[0044] Specifically, the second guide member 56 is a guide rod. The second guide member 56 passes through the second guide hole and moves axially along the second guide hole. The second guide member 56 can limit the movement direction of the clamping member 4 relative to the first connecting member 3. Since the second connecting member 53 moves in the same direction as the first connecting member 3 through the first guide member 55, the first connecting member 3, the second connecting member 53, and the clamping member 4 move in the same direction, making the force transmission of the airtightness testing equipment more stable and effectively improving the detection accuracy of the pressure sensor 52.

[0045] Reference Figure 2 As shown in the embodiment of this application, the second connector 53 has a third guide hole for cooperating with the second guide 56, and the second guide 56 passes through the second connector 53 and the first connector 3; a linear motion support 57 is provided at the second guide hole and the third guide hole, and the linear motion support 57 is used to cooperate with the second guide 56.

[0046] Specifically, the second guide member 56 passes through both the second connector 53 and the third connector, further improving the overall integrity between the buffer assembly 5, the first connector 3, and the clamping member 4. The linear motion support 57 limits the movement of the second guide member 56, reducing its resistance and thus improving the detection accuracy of the pressure sensor 52.

[0047] The working principle of the buffer component 5 in this embodiment can be briefly described as follows: After the clamping member 4 contacts the workpiece or fixture, it stops. The first connecting member 3 continues to press down. The pressure is buffered by the elastic member 51 and transmitted to the second connecting member 53. The elastic member 51 is compressed axially under the limit of the first guide member 55. The pressure is transmitted to the pressure sensor 52 through the second connecting member 53. The first connecting member 3, the second connecting member 53 and the clamping member 4 move axially under the limit of the second guide member 56. When the first connecting member 3 and the second connecting member 53 contact the limiting member 54 at the same time, the buffer assembly 5 maintains its current state.

[0048] In this embodiment, the arrangement of the first guide 55, the second guide 56 and their corresponding mating parts results in a small offset during force transmission and more accurate detection results from the pressure sensor 52; the arrangement of the limiting member 54 ensures that the pressure of the clamping member 4 on the workpiece or fixture will not exceed the preset value, effectively reducing the probability of damage to the workpiece or fixture.

[0049] Reference Figure 1 As shown in the embodiments of this application, the airtightness testing equipment also includes The base assembly 6 is located on the side of the clamping member 4 away from the driver 2, and is used to cooperate with the clamping member 4 to clamp the workpiece; The fixture assembly 7 includes a first fixture 71 disposed on the clamping member 4 and a second fixture 72 disposed on the base assembly 6; the first fixture 71 is provided with a groove for accommodating the workpiece, and the groove and the second fixture 72 form a closed space.

[0050] In this embodiment, the base assembly 6 can be fixed by providing a clamp for fixing the fixture or workpiece. Additionally, the base assembly 6 can also be adjusted by providing a slide rail to move the clamp, facilitating alignment with the clamping member 4.

[0051] Specifically, the base assembly 6 is mounted on the machine tool 1 and is located in the direction of movement of the output shaft of the driver 2. The base assembly 6 includes a clamping structure for fixing the second fixture 72. The first fixture 71 is mounted on the clamping member 4. The first fixture 71 and the second fixture 72 cooperate to form a sealed space for accommodating the workpiece. The first fixture 71 can move with the clamping member 4. Due to the setting of the buffer assembly 5, the downward pressure of the first fixture 71 towards the second fixture 72 can be precisely controlled. For example, after the first fixture 71 and the second fixture 72 come into contact, the driver 2 is controlled to stop outputting power in time according to the pressure detected by the pressure sensor 52. The first fixture 71 and the second fixture 72 maintain a suitable contact pressure, which can effectively reduce the wear and airtightness reduction of the first fixture 71 and the second fixture 72 caused by excessive pressure, or the airtightness reduction caused by gaps between the first fixture 71 and the second fixture 72 due to insufficient pressure.

[0052] Understandably, the groove also serves to limit the position of the workpiece. The groove is a contour groove, its shape adapting to the shape of the workpiece. After the workpiece is placed inside the groove, the workpiece and the inner wall of the groove form a testing space. The first fixture 71 has a hole for inputting detection gas. The detection gas is input into the testing space, and the airtightness of the workpiece is tested by detecting the detection gas outside the testing space.

[0053] Reference Figure 1 As shown in the embodiment of this application, the base assembly 6 includes Sliding mechanism 61; The sliding platform 63 is slidably disposed on the sliding mechanism 61 and is used to set the second fixture 72; The barcode scanning component 64 is located on the sliding mechanism 61 and is used to record the workpiece information on the second fixture 72.

[0054] In this embodiment, the sliding mechanism 61 can employ a cylinder, motor, or hydraulic cylinder to output driving force. In a preferred embodiment, the sliding mechanism 61 includes double slide rails 62, and a sliding platform 63 is movably mounted on the slide rails 62. The sliding mechanism 61 also includes a sensor for detecting the position of the sliding platform 63, so that the sliding platform 63 is aligned with the clamping member 4 or the barcode scanning assembly 64. The barcode scanning assembly 64 includes a camera for detecting workpiece information. It is understood that the sliding mechanism 61 can also be designed as a single slide rail, etc.

[0055] The working principle of the base assembly 6 provided in this application embodiment can be briefly described as follows: The sliding platform 63 is initially located on the outside of the bracket near the barcode scanning component 64. The barcode scanning component 64 detects the workpiece information and records it into the external control system. Then, the sliding platform 63 moves to the bottom of the clamping component 4, and the driver 2 controls the clamping component 4 to press down. The first fixture 71 and the second fixture 72 cooperate to seal the workpiece and start the airtightness test. After the test is completed, the sliding platform 63 moves back to the initial position, and the control system controls the external robot to remove the workpiece according to the test results and the recorded workpiece information.

[0056] In this embodiment of the application, the testing environment of the workpiece is well sealed, the workpiece loading and unloading are convenient, and the degree of automation is high.

[0057] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. An airtightness testing device, characterized in that, include drive; The first connector is connected to the output shaft of the driver; A clamping element, located on the side of the first connector opposite to the driver, is used to clamp the workpiece; A buffer assembly is located between the first connector and the clamping member, and is connected to the first connector and the clamping member; the buffer assembly includes an elastic element and a pressure sensor arranged along the axial direction, the elastic element is used to buffer the pressure between the first connector and the clamping member, and the pressure sensor is used to detect the pressure.

2. The airtightness testing device according to claim 1, characterized in that, The buffer assembly further includes a second connector, with a plurality of elastic elements circumferentially disposed on one side of the second connector and the pressure sensor disposed on the other side of the second connector.

3. The airtightness testing device according to claim 2, characterized in that, The buffer assembly further includes a limiting member located between the first connector and the second connector, the limiting member being used to limit the distance between the first connector and the second connector.

4. The airtightness testing device according to claim 2 or 3, characterized in that, One end of the elastic element is connected to the first connecting element, and the other end is connected to the second connecting element; The end of the pressure sensor facing away from the elastic element is connected to the clamping element.

5. The airtightness testing device according to claim 4, characterized in that, The buffer assembly further includes a first guide member, one end of which is connected to the second connector, and the first connector member has a first guide hole that cooperates with the first guide member.

6. The airtightness testing device according to claim 5, characterized in that, The elastic element is a cylindrical helical spring, and the first guide element is located inside the cylindrical helical spring.

7. The airtightness testing device according to claim 6, characterized in that, The buffer assembly further includes a second guide member, one end of which is connected to the clamping member, and the first connector also has a second guide hole that cooperates with the second guide member.

8. The airtightness testing device according to claim 7, characterized in that, The second connector has a third guide hole for engaging with the second guide, the second guide passing through the second connector and the first connector; Linear motion supports are provided at the second guide hole and the third guide hole, and the linear motion supports are used to cooperate with the second guide member.

9. The airtightness testing device according to claim 8, characterized in that, Also includes The base assembly is located on the side of the clamping member opposite to the driver and is used to cooperate with the clamping member to clamp the workpiece; The fixture assembly includes a first fixture disposed on the clamping member and a second fixture disposed on the base assembly; the first fixture has a groove for accommodating a workpiece, the groove and the second fixture forming a sealed space.

10. The airtightness testing device according to claim 9, characterized in that, The base assembly includes Sliding mechanism; A sliding platform, slidably disposed on the sliding mechanism, is used to set the second fixture; A barcode scanning component, located on the sliding mechanism, is used to record workpiece information on the second fixture.

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