Airtightness detection jig based on flat plate rear shell

Abstract

The utility model relates to the technical field of panel detection, in particular to an air tightness detection jig based on a panel rear shell, which comprises a rack, a pushing assembly, an operation table and a test board, and a plurality of electric heating blocks used for assisting in increasing air pressure are mounted on the surface of the test board; the electric heating block is additionally arranged to increase the heat temperature in the gas, so that the pressure degree of the gas is increased, when the temperature rises, the pressure rises, the structure heats the gas, the pressure higher than the driving force can be driven under the action of the original driving force of the pushing cylinder, and the test pressure is enhanced; in addition, when the driving force of the pushing air cylinder is reduced, the driving force keeps the original pressure in cooperation with the gas pressure, and therefore the effects of reducing abrasion of the pushing air cylinder and using overtravel are achieved, and the effects of flexibly using the pushing air cylinder and prolonging the service life of the pushing air cylinder are achieved. Through the cooperation of the structure, the passivation probability of the driving assembly is reduced, so that the probability of influencing the measured value is avoided.

Description

Technical Field

[0001] This utility model relates to the field of flat plate testing technology, and in particular to an airtight testing fixture based on the back shell of a flat plate. Background Technology

[0002] Electronic products have high requirements for airtightness. Good airtightness can make electronic products have better waterproof and dustproof performance. Therefore, airtightness testing of electronic products, that is, airtightness testing of electronic product components (specifically referring to the casing of electronic products), is quite necessary.

[0003] A relevant reference is Chinese Patent CN118168726A, which discloses a device for testing the airtightness of a tablet computer casing. This device relates to the technical field of airtightness testing, and includes a fixture mechanism for loading the tablet computer casing, a clamping mechanism for applying pressure from the top, and a transfer mechanism for transferring the casing. The fixture mechanism includes a first fixture and a second fixture. After loading the tablet computer casing, the first fixture moves towards the clamping mechanism to perform airtightness testing on some of the holes. Under the transfer mechanism, the tablet computer casing is loaded onto the second fixture. After loading, the second fixture moves towards the clamping mechanism to perform airtightness testing on the remaining holes. This device can simultaneously perform airtightness testing on multiple holes of the tablet computer casing without manual transfer, exhibiting a high degree of integration and industrialization, significantly improving the efficiency of airtightness testing and reducing the workload of operators.

[0004] While this patent achieves the effect of airtightness testing, its structure still adopts the traditional mold-closing and pressurizing method, which tests the airtightness after sealing. However, when the driving component that applies pressure reaches a certain age, insufficient pressure may occur, leading to decompression. On the other hand, continuously reaching the specified pressure value can easily cause the driving component to become dull, which may affect the probability of the measured value. To address these issues, the inventors have proposed an airtightness testing fixture based on a flat back shell to solve the aforementioned technical problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the aforementioned problems.

[0006] An airtightness testing fixture based on a flat back shell includes a frame, a pushing assembly, an operating table, and a testing table. The testing table is mounted on the surface of the operating table, and both the operating table and the testing table are located inside the frame. The pushing assembly includes a pushing cylinder, a pushing block, a pushing rod, and a buffer pad, which are connected sequentially from top to bottom. The interior of the testing table is a testing area, and the surface of the testing area has a placement area for placing products. Several heating blocks for assisting in increasing air pressure are mounted on the surface of the testing table. Pre-compression blocks are provided along the edge of the testing table to prevent overpressure. The surface of the placement area has pressure blocks and pressure plates for assisting in pressing products. An air inlet structure is provided in the testing area.

[0007] This structure uses an added heating element to increase the temperature of the gas, thereby increasing the gas pressure. The effect of temperature on pressure is an important physical phenomenon. When dealing with gases, the relationship between gas pressure, volume, and temperature is described according to the ideal gas law:

[0008] PV = nRT, where: P is the gas pressure, V is the gas volume, n is the number of moles of gas, R is the ideal gas constant, approximately 8.314 J / (mol·K), and T is the absolute temperature of the gas, in Kelvin (K). This equation shows that when the gas volume and number of moles remain constant, the pressure P is directly proportional to the temperature T. As the temperature increases, the average kinetic energy of the gas molecules increases, leading to more frequent and intense collisions between molecules, thus increasing the pressure on the container wall. This structure heats the gas, allowing it to generate a pressure higher than the original driving force of the cylinder while maintaining the original driving force, thereby strengthening the test pressure. Furthermore, when the driving force of the cylinder is reduced, the gas pressure is adjusted to maintain the original driving force, thus reducing cylinder wear and overtravel, achieving flexible use of the cylinder and extending its service life.

[0009] Furthermore, the frame is internally equipped with a mold frame assembly for assisting the test bench and operating table. The mold frame assembly includes a support rod, a limiting buffer block, a guide post, and a guide sleeve. The limiting buffer block abuts against one end of the support rod. The guide post is installed inside the guide sleeve. One end of the push rod is connected to a push plate. The guide sleeve is installed on the surface of the push plate. A top plate is placed on the surface of the test bench, and one end of the top plate is in contact with the surface of the pressure plate. The push plate is used to push the top plate.

[0010] The design of guide pillars and guide sleeves ensures that the push plate moves along a predetermined path during the pushing process, improving positioning accuracy and increasing smooth movement. This reduces testing errors caused by unstable movement. The limiting buffer block absorbs the impact and vibration during the pushing process, improving overall stability. When the push plate and top plate push the pressure block and pressure plate, the pressure of the pressure block and pressure plate presses the products inside the placement area, preventing damage caused by uneven local stress. This facilitates the testing of airtightness when filling with gas later. The placement area can be adjusted and replaced according to changes in the shape and size of the flat shell.

[0011] Furthermore, sealing rings are provided on the surface of the placement area and between the test area and the test platform to increase sealing. The surface of the test platform is provided with positioning pins to assist in the opening and closing of the mold. The sealing rings increase airtightness and prevent gas leakage due to weak local stress points when testing pressure, which would affect the measured values. The sealing rings can also maintain the stability of the environment in the test area, reduce the influence of external factors on the test results, and improve the accuracy of the test. On the other hand, they can also ensure the control of pressure and temperature in the test area, and improve the consistency and repeatability of the test results.

[0012] Furthermore, the pre-compression adhesive block is connected to the test platform via a limiting plate. The pre-compression adhesive block is distributed on both sides of the test platform, and the heating block is located between the two sides of the test platform. The limiting plate can increase the stability of the pre-compression adhesive block during the test process, reduce test errors caused by position changes, and the stability of the pre-compression adhesive block can reduce vibration during the test process and improve the overall stability.

[0013] The working principle of the heating block is based on the resistance heating effect. Heat is generated by the current passing through the resistive material. When the heating block is connected to the power source through the lead wire, the current begins to pass through the heating element. Due to the resistance, heat is generated, and this heat is transferred to other parts of the heating block. The heating block of this structure can also transfer heat to the object or area to be heated through conduction, convection and radiation, thereby achieving the heating of gas.

[0014] Furthermore, a pressure regulating valve is installed on the surface of the pushing cylinder, a pressure sensor is installed inside the test bench, the pressure sensor is electrically connected to an alarm, and the alarm is installed on the surface of the frame.

[0015] The pressure regulating valve can control the working pressure of the push cylinder, ensuring that the cylinder works under the predetermined pressure, improving the accuracy and reliability of the test. In addition, the pressure can be dynamically adjusted according to actual needs to adapt to different test conditions and requirements, preventing the pressure inside the push cylinder from exceeding the safety limit, reducing equipment damage and safety accidents caused by overpressure. The cooperation between the pressure regulating valve and the pressure sensor can ensure the stability of the pressure inside the test bench, reducing test errors caused by pressure fluctuations. The pressure sensor plays a feedback role.

[0016] The push cylinder and the pressure regulating valve are two common key components in pneumatic systems. This structure uses an air pipe connection, so that the outlet of the pressure regulating valve is connected to the inlet of the push cylinder through the air pipe. The compressed air source provides high-pressure gas, the adjustment knob of the pressure regulating valve is set to a specified position, the spring applies a certain preload force, and a predetermined pressure value is set, thereby controlling the gas pressure entering the push cylinder and ensuring that the cylinder works under the predetermined pressure.

[0017] Pressure sensors use capacitive sensing elements to detect pressure changes and convert the detected pressure changes into electrical signals, such as voltage or current. These electrical signals are then output to the alarm via wires. The alarm receives the electrical signals from the pressure sensor, processes them, and determines whether a preset threshold is exceeded. When the pressure exceeds the preset threshold, an alarm signal is triggered.

[0018] Furthermore, the surface of the control panel is equipped with several operation buttons for auxiliary operation, and the bottom of the control panel is connected to several support feet. The installation of operation buttons allows operators to quickly perform various operations, reducing operation time and complexity, and reducing equipment failures and safety accidents caused by misoperation. The support feet support the overall weight of the structure and increase the friction at the bottom, reducing operational accidents caused by sliding and tilting.

[0019] Furthermore, the air intake structure includes several air intake holes for connecting to an external air supply device. The design of the air intake holes allows the external air supply device to be quickly connected to the test area, reducing preparation time and operational complexity, ensuring that the gas supplied by the external air supply device enters the test area at a predetermined pressure and flow rate, and improving the accuracy and reliability of the operation.

[0020] The surface of the test area is equipped with a handle, which is connected to the test bench via a mounting connector. One end of the handle rotates via a rotating shaft located on the surface of the mounting connector. This handle-mounted structure allows operators to move the test bench by using the handle, increasing the flexibility of use.

[0021] Furthermore, the surface of the test bench is provided with an exhaust groove to prevent overpressure. One end of the exhaust groove extends to the outside of the test bench. When the pressure exceeds the bearing capacity of the sealing ring, the gas is forced into the sealing ring and reaches the interior of the exhaust groove. The exhaust groove acts as a vent, releasing excess gas inside the test bench in a timely manner, preventing overpressure caused by gas accumulation. This protects the test bench and related equipment from overpressure damage and improves overall safety. In addition, when the measurement is completed, timely venting can reduce vibrations generated during mold opening, prevent harmful explosive gas bursts, and prevent explosions or ruptures caused by overpressure, reducing safety hazards and ensuring the safety of operators and equipment.

[0022] Compared with the prior art, the beneficial effects of this utility model are: by adding an electric heating block to increase the heat temperature in the gas, the gas pressure is increased. When the volume and number of moles of the gas remain constant, the pressure P is proportional to the temperature T. When the temperature rises, the average kinetic energy of the gas molecules increases, resulting in more frequent and intense collisions between molecules, thereby increasing the pressure on the container wall and raising the pressure. This structure heats the gas, so that while maintaining the original driving force of the cylinder, it can drive a pressure higher than the driving force, thus strengthening the test pressure.

[0023] Furthermore, when the driving force of the push cylinder is reduced, the gas pressure is adjusted to maintain the original driving force. This means that even with a reduced driving force, the pressure can still reach the specified test pressure value, thereby reducing wear and overtravel of the push cylinder. This achieves the effect of flexible use of the push cylinder and extending its service life. Through this structure, the probability of drive component passivation is reduced, thus avoiding the occurrence of factors that affect the measured values. Attached Figure Description

[0024] Figure 1 This is a front view of an airtightness testing fixture based on a flat back shell;

[0025] Figure 2 This is a three-dimensional view of an airtightness testing fixture based on a flat back shell;

[0026] Figure 3 Another perspective view of an airtightness testing fixture based on a flat back shell;

[0027] Figure 4 This is another perspective view of an airtightness testing fixture based on a flat back shell;

[0028] Figure 5 This is a partial three-dimensional view of an airtightness testing fixture based on a flat back shell;

[0029] Figure 6This is a partial three-dimensional view of another airtightness testing fixture based on a flat back shell;

[0030] Figure 7 This is a three-dimensional view of a test platform in an airtightness testing fixture based on a flat back shell;

[0031] Figure 8 Another perspective view of the test platform in an airtightness testing fixture based on a flat back shell;

[0032] Figure 9 This is another perspective view of the test platform in an airtightness testing fixture based on a flat back shell;

[0033] Figure 10 This is a partial structural diagram of the test platform in an airtightness testing fixture based on a flat back shell;

[0034] Figure 11 This is another partial structural diagram of the test platform in an airtightness testing fixture based on a flat back shell;

[0035] Figure 12 This is another partial structural diagram of the test platform in an airtightness testing fixture based on a flat back shell;

[0036] In the diagram: Frame-1, Operating table-2, Test table-3, Push cylinder-4, Push block-5, Push rod-6, Buffer pad-7, Test area-8, Placement area-9, Heating block-10, Pre-compression rubber block-11, Pressure block-12, Pressure plate-13, Support rod-14, Limit buffer block-15, Guide column-16, Guide sleeve-17, Push plate-18, Top plate-19, Sealing ring-20, Positioning pin-21, Limit plate-22, Pressure regulating valve-23, Pressure sensor-24, Alarm-25, Operation button-26, Support foot pad-27, Air inlet-28, Handle-29, Mounting connector-30, Rotating shaft-31, Exhaust groove-32. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] For this embodiment, please refer to Figures 1-12The present invention relates to an airtightness testing fixture based on a flat back shell, comprising a frame 1, a pushing assembly, an operating table 2, and a testing table 3. The testing table 3 is mounted on the surface of the operating table 2, and both the operating table 2 and the testing table 3 are located inside the frame 1. The pushing assembly includes a pushing cylinder 4, a pushing block 5, a pushing rod 6, and a buffer pad 7, which are connected sequentially from top to bottom. The interior of the testing table 3 is a testing area 8, and the surface of the testing area 8 is provided with a placement area 9 for placing products. Several heating blocks 10 for assisting in increasing air pressure are mounted on the surface of the testing table 3. The edge of the testing table 3 is provided with a pre-pressing rubber block 11 to prevent overpressure. The surface of the placement area 9 is provided with a pressing block 12 and a pressing plate 13 for assisting in pressing products. The testing area 8 is provided with an air inlet structure.

[0039] This structure employs an additional heating element 10 to increase the temperature of the gas, thereby increasing the gas pressure. The effect of temperature on pressure is an important physical phenomenon. When dealing with gases, the relationship between gas pressure, volume, and temperature is described according to the ideal gas law:

[0040] PV = nRT, where: P is the gas pressure, V is the gas volume, n is the number of moles of gas, R is the ideal gas constant, approximately 8.314 J / (mol·K), and T is the absolute temperature of the gas (in Kelvin, K). This equation shows that when the gas volume and number of moles remain constant, the pressure P is directly proportional to the temperature T. As the temperature increases, the average kinetic energy of the gas molecules increases, leading to more frequent and intense collisions between molecules, thus increasing the pressure on the container wall. This structure heats the gas, allowing it to generate a pressure higher than the original driving force of the cylinder 4 while maintaining the original driving force, thereby strengthening the test pressure. Furthermore, when the driving force of the cylinder 4 is reduced, the gas pressure is adjusted to maintain the original driving force, thus reducing wear on the cylinder 4 and preventing overtravel, achieving flexible use of the cylinder 4 and extending its service life.

[0041] The frame 1 is internally equipped with a mold frame assembly for auxiliary testing platform 3 and operating platform 2. The mold frame assembly includes a support rod 14, a limiting buffer block 15, a guide post 16 and a guide sleeve 17. The limiting buffer block 15 abuts against one end of the support rod 14. The guide post 16 is installed inside the guide sleeve 17. One end of the push rod 6 is connected to a push plate 18. The guide sleeve 17 is installed on the surface of the push plate 18. A top plate 19 is placed on the surface of the testing platform 3, and one end of the top plate 19 is in contact with the surface of the pressure plate 13. The push plate 18 is used to push the top plate 19.

[0042] The design of guide post 16 and guide sleeve 17 ensures that push plate 18 moves along a predetermined path during the pushing process, improving positioning accuracy and increasing smooth movement. This reduces test errors caused by unstable movement. Limiting buffer block 15 can absorb impact and vibration during the pushing process, improving overall stability. When push plate 18 and top plate 19 push pressure block 12 and pressure plate 13, the pressure of pressure block 12 and pressure plate 13 presses the product inside placement area 9, avoiding damage caused by uneven local force. This facilitates the testing of airtightness when gas is subsequently filled. Placement area 9 can be adjusted and replaced according to changes in the shape and size of the flat shell.

[0043] The surface of the placement area 9 and the test area 8 are respectively provided with sealing rings 20 to increase the sealing performance. The surface of the test platform 3 is provided with positioning pins 21 to assist in the opening and closing of the mold. The sealing rings 20 increase the airtightness and prevent gas leakage due to weak local stress points when testing pressure, which would affect the measured values. In addition, the sealing rings 20 can maintain the stability of the environment in the test area, reduce the influence of external factors on the test results, and improve the accuracy of the test. On the other hand, they can also ensure the control of pressure and temperature in the test area, and improve the consistency and repeatability of the test results.

[0044] The pre-compression adhesive block 11 is connected to the test platform 3 through the limiting plate 22. The pre-compression adhesive block 11 is distributed on both sides of the test platform 3, and the heating block 10 is located between the two sides of the test platform 3. The limiting plate 22 can increase the stability of the pre-compression adhesive block 11 during the test, reduce the test error caused by position changes, and the stability of the pre-compression adhesive block 11 can reduce vibration during the test and improve the overall stability.

[0045] The working principle of the heating block 10 is based on the resistance heating effect, where heat is generated by the current passing through the resistive material. When the heating block 10 is connected to the power source through the lead wire, the current begins to pass through the heating element. Due to the resistance, heat is generated, and this heat is transferred to other parts of the heating block 10. The heating block 10 of this structure can also transfer heat to the object or area to be heated by means of conduction, convection and radiation, thereby achieving the heating of gas.

[0046] A pressure regulating valve 23 is installed on the surface of the push cylinder 4, and a pressure sensor 24 is installed inside the test bench 3. The pressure sensor 24 is electrically connected to an alarm 25, and the alarm 25 is installed on the surface of the frame 1.

[0047] The pressure regulating valve 23 can control the working pressure of the push cylinder 4, ensuring that the cylinder works under the predetermined pressure, improving the accuracy and reliability of the test. In addition, the pressure can be dynamically adjusted according to actual needs to adapt to different test conditions and requirements, preventing the pressure inside the push cylinder 4 from exceeding the safety limit, reducing equipment damage and safety accidents caused by overpressure. The cooperation between the pressure regulating valve 23 and the pressure sensor 24 can ensure the stability of the pressure inside the test bench 3, reducing test errors caused by pressure fluctuations. The pressure sensor 24 plays a feedback role.

[0048] The push cylinder 4 and the pressure regulating valve 23 are two common key components in pneumatic systems. This structure uses an air pipe connection, so that the outlet of the pressure regulating valve 23 is connected to the inlet of the push cylinder 4 through the air pipe. The compressed air source provides high-pressure gas, the adjustment knob of the pressure regulating valve 23 is set to a specified position, the spring applies a certain preload force, and a predetermined pressure value is set, thereby controlling the gas pressure entering the push cylinder 4 and ensuring that the cylinder works under the predetermined pressure.

[0049] The pressure sensor 24 uses a capacitive sensing element to sense pressure changes and converts the sensed pressure changes into electrical signals, such as voltage or current. The electrical signals are then output to the alarm 25 via wires. The alarm 25 receives the electrical signals from the pressure sensor 24, processes the input electrical signals, and determines whether they exceed a preset threshold. When the pressure exceeds the preset threshold, an alarm signal is triggered.

[0050] The surface of the control panel 2 is equipped with several operation buttons 26 for auxiliary operation, and the bottom of the control panel 2 is connected with several support feet 27. The installation of operation buttons 26 allows operators to quickly perform various operations, reducing operation time and complexity, and reducing equipment failures and safety accidents caused by misoperation. The support feet 27 support the overall weight of the structure and increase the friction at the bottom, reducing operation accidents caused by sliding and tilting.

[0051] The air intake structure includes several air intake holes 28, which are used to connect to an external air supply device. The design of the air intake holes 28 allows the external air supply device to be quickly connected to the test area 8, reducing preparation time and operational complexity. It ensures that the gas supplied by the external air supply device enters the test area 8 at a predetermined pressure and flow rate, improving the accuracy and reliability of the operation. An airtightness instrument is connected through the air intake holes 28 to detect the airtightness of the semi-finished product shell.

[0052] A handle 29 is installed on the surface of the test area 8. The handle 29 is connected to the test bench 3 via a mounting connector 30. One end of the handle 29 rotates via a rotating shaft 31 located on the surface of the mounting connector 30. The structure of the handle 29 facilitates the operator to move the test bench 3 by using the handle 29, thereby increasing the flexibility of use.

[0053] The surface of the test bench 3 is provided with an exhaust groove 32 to prevent overpressure. One end of the exhaust groove 32 extends to the outside of the test bench 3. When the pressure exceeds the bearing capacity of the sealing ring, the gas is forced into the sealing ring and reaches the interior of the exhaust groove 32. The exhaust groove 32 acts as a vent to release excess gas inside the test bench 3 in a timely manner, preventing overpressure caused by gas accumulation. This protects the test bench 3 and related equipment from overpressure damage and improves overall safety. In addition, when the measurement is completed, timely venting can reduce the vibration generated during mold opening, avoid the formation of harmful explosive gas blasts, and prevent explosions or ruptures caused by overpressure, reducing safety hazards and ensuring the safety of operators and equipment.

[0054] The key design feature of this invention is that by adding an electric heating block 10, the heat and temperature of the gas are increased, thereby increasing the gas pressure. When the volume and number of moles of the gas remain constant, the pressure P is proportional to the temperature T. When the temperature rises, the average kinetic energy of the gas molecules increases, resulting in more frequent and intense collisions between molecules, which increases the pressure on the container wall and thus raises the pressure. This structure heats the gas, so that while maintaining the original driving force of the pushing cylinder 4, it can drive a pressure higher than the driving force, thereby strengthening the test pressure.

[0055] Furthermore, when the driving force of the push cylinder 4 is reduced, the driving force is maintained at the original pressure by coordinating with the gas pressure. That is, even if the driving force of the push cylinder 4 is reduced, the pressure can still reach the specified pressure value of the test, thereby reducing the wear of the push cylinder 4 and the use of overstroke, achieving the effect of flexible use of the push cylinder 4 and extending the service life of the push cylinder 4.

[0056] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A gas tightness testing fixture based on a flat back shell, comprising a frame, a pushing assembly, an operating table, and a testing table, characterized in that: The test bench is installed on the surface of the operating table, and both the operating table and the test bench are located inside the frame. The pushing assembly includes a pushing cylinder, a pushing block, a pushing rod, and a buffer pad. The pushing cylinder, pushing block, pushing rod, and buffer pad are connected in sequence from top to bottom. The interior of the test bench is the test area. The surface of the test area has a placement area for placing products. Several heating blocks for assisting in increasing air pressure are installed on the surface of the test bench. The edge of the test bench is provided with a pre-pressurization block to prevent overpressure. The surface of the placement area is provided with a pressing block and a pressing plate for assisting in pressing the products. The test area has an air intake structure.

2. The airtightness testing fixture based on a flat back shell according to claim 1, characterized in that: The frame is internally equipped with a mold frame assembly for auxiliary testing and operation. The mold frame assembly includes a support rod, a limiting buffer block, a guide post, and a guide sleeve. The limiting buffer block abuts against one end of the support rod. The guide post is installed inside the guide sleeve. One end of the push rod is connected to a push plate. The guide sleeve is installed on the surface of the push plate. A top plate is placed on the surface of the testing table, and one end of the top plate is in contact with the surface of the pressure plate. The push plate is used to push the top plate.

3. The airtightness testing fixture based on a flat back shell according to claim 1, characterized in that: The surface of the placement area and the test area are respectively provided with sealing rings to increase the sealing performance between them and the test table. The surface of the test table is provided with positioning pins to assist in the opening and closing of the mold.

4. A gas tightness testing fixture based on a flat back shell according to any one of claims 1-3, characterized in that: The pre-compression adhesive blocks are connected to the test platform via a limiting plate. The pre-compression adhesive blocks are distributed on both sides of the test platform, and the heating blocks are located between the two sides of the test platform.

5. A gas tightness testing fixture based on a flat back shell according to any one of claims 1-3, characterized in that: A pressure regulating valve is installed on the surface of the push cylinder, and a pressure sensor is installed inside the test bench. The pressure sensor is electrically connected to an alarm, which is installed on the surface of the frame.

6. A gas tightness testing fixture based on a flat back shell according to any one of claims 1-3, characterized in that: The surface of the control panel is equipped with several operation buttons for auxiliary operation, and the bottom of the control panel is connected to several support feet.

7. A gas tightness testing fixture based on a flat back shell according to any one of claims 1-3, characterized in that: The air intake structure includes several air intake holes for connecting to an external air supply device. A handle is installed on the surface of the test area. The handle is connected to the test bench through a mounting connector. One end of the handle rotates through a rotating shaft located on the surface of the mounting connector.

8. A gas tightness testing fixture based on a flat back shell according to any one of claims 1-3, characterized in that: The surface of the test bench is provided with an exhaust groove to prevent overpressure, and one end of the exhaust groove extends to the outside of the test bench.

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