Air tightness detection device for machining
By using this device, high-precision detection of minor leaks and serious leaks can be achieved, which solves the automation level of the air tightness detection device of mechanically processed products in the existing technology, improves the application of the existing technology, and reduces the equipment cost.
Patent Information
- Application Number
- CN202510980022.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-09-19
AI Technical Summary
The existing technology for air tightness testing of machined products has the problems of difficulty in efficiently detecting minute leaks and determining the specific leak location during large-scale testing, and the degree of automation is low.
An air tightness testing device consisting of a test tank, a constant pressure component, a driving mechanism and a closing mechanism was designed. The screening component pushes products one by one into an independent space for targeted testing. Combined with the closing mechanism, high-precision leak detection and automated operation can be achieved.
It achieves high-precision detection of minor and serious leaks, can automatically process multiple products, improves detection efficiency and accuracy, and reduces equipment costs.
Smart Images
Figure CN120668325A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of air tightness detection, in particular to an air tightness detection device for mechanical processing. Background Art
[0002] Airtightness testing of machined products ensures that their sealing properties meet design requirements, thereby preventing safety hazards, performance failures, and environmental pollution caused by leaks. For example, in automotive manufacturing, leaks in fuel system components can lead to explosions; in medical devices, seal failures can compromise the sterile environment; and in the new energy sector, leaks in hydrogen storage tanks can cause explosions. Precise testing not only ensures product reliability under extreme operating conditions such as high pressure and vacuum, but also reduces repair costs and extends product life, making it an essential quality assurance step in industrial manufacturing.
[0003] Common airtightness testing methods for machining in the existing technology include the pressure decay method and the bubble method / immersion method. The pressure decay method involves filling the test piece with compressed gas, measuring the pressure drop after stabilizing the pressure, and calculating the leakage rate based on the pressure change rate. This method is particularly suitable for components with larger leakage problems, as it is prone to rapid leakage into the inside of the component during the injection process, which may lead to a small change in the pressure difference after subsequent closure, resulting in missed detections. The immersion method has limited sensitivity and also requires cleaning and drying at a later stage, which is time-consuming and labor-intensive. On the other hand, in the airtightness testing process for large-scale machined finished products, it is difficult to efficiently determine the specific location of the leaking product after a leak is discovered. Summary of the Invention
[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an air tightness detection device for mechanical processing to solve the problems raised in the above-mentioned background technology. The present invention can realize the high-precision detection function of minor leaks and serious leaks. When multiple mechanical processing products of uniform specifications are tested and leakage problems are detected, each product can be pushed one by one with the help of screening components and sealing mechanisms, and moved to an independent space at one end of the inside of the test tank, and targeted testing can be carried out again inside the space, so as to achieve the purpose of accurately judging the product after the leakage is found, and the degree of automation is higher.
[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: An air tightness detection device for mechanical processing, comprising an air tightness detection device body, the air tightness detection device body comprising a detection tank, a constant pressure component, a driving mechanism and a closing mechanism, a screening component is installed at one end of the detection tank, a cover plate is provided on the surface of the screening component, a threaded sleeve is inserted through the surface of the cover plate, a driving bin is integrally formed at the bottom of the detection tank, the driving mechanism passes through the interior of the driving bin, a strip hole is provided at the top of the detection tank, the closing mechanism passes through the strip hole at the top of the detection tank, and a rack is integrally formed on the side of the closing mechanism, the rack is connected to the driving mechanism part, one end of the constant pressure component is connected to a connecting pipe, an electromagnetic valve is installed in the middle of the connecting pipe, the interior of the constant pressure component is connected to the interior of the detection tank through the connecting pipe, a pressure gauge is inserted at the top of the detection tank, a material removal baffle is installed at the other end of the detection tank, and the end of the connecting pipe is connected to the detection tank area above the material removal baffle.
[0006] Furthermore, the constant pressure assembly includes a pressure tank, a rear baffle and a piston plate, an electric telescopic rod is inserted in the middle of the rear baffle, the end of the electric telescopic rod is screwed with a piston plate, the piston plate and the end of the electric telescopic rod are both embedded in the interior of the pressure tank, and the side of the piston plate is in contact with the inner wall of the pressure tank.
[0007] Furthermore, the driving mechanism includes a motor, a driving shaft and a pushing wheel. A support frame is welded on the surface of the driving bin, an end plate is welded on the end of the support frame, a motor is screwed on the surface of the end plate, and a driving shaft is inserted into the output end of the motor.
[0008] Furthermore, the surface key of the driving shaft is connected to a gear, and a pushing wheel is welded in the middle of the driving shaft. There are two gears, and the two gears are symmetrically installed on both sides of the pushing wheel. The surface of the pushing wheel is mounted with an anti-slip pad, and the top of the pushing wheel penetrates into the interior of the detection tank from the top of the driving compartment.
[0009] Furthermore, the closing mechanism includes a rack, a transmission frame and a partition. The top of the rack is integrally formed with the transmission frame. A top sealing strip is welded to one end of the transmission frame. A partition is welded to the bottom of the top sealing strip. A bottom sealing strip is welded to the bottom of the partition. A plug-in plate is integrally formed at the bottom end of the bottom sealing strip.
[0010] Furthermore, a guide sleeve is welded to the side of the detection tank, the bottom of the transmission frame passes through the inside of the guide sleeve, and the inner wall of the guide sleeve is in contact with the surface of the transmission frame.
[0011] Furthermore, the rack is engaged with the side of the gear, the top sealing strip is used to press on the top of the strip hole on the top of the detection tank, and the bottom sealing strip is used to lean against the inner wall of the strip hole on the top of the detection tank. The partition and the plug-in plate are used to divide the internal cavity of the detection tank, and the internal volume of the detection tank is larger than the volume inside the pressure tank.
[0012] Furthermore, the screening assembly includes a cover plate, a screw rod and a clamping plate, the screw rod passes through the inside of the threaded sleeve, and a handwheel is welded to one end of the screw rod, and a support plate is screwed to the other end of the screw rod. A sealing layer is attached to the side of the support plate close to the screw rod, and one side of the support plate is used to lean against the surface of the workpiece to be measured, and the other side of the support plate is used to be squeezed and fitted on the inner wall of the cover plate.
[0013] Furthermore, the inner side of the clamp is used to place the workpiece to be tested, and a groove is provided on the top of the clamp. The bottom of the test tank is provided with a base plate, and a notch is provided on the surface of the base plate. The bottom of the clamp is used to be embedded in the notch on the base plate.
[0014] Furthermore, the plug-in plate is used to be embedded in the inside of the groove, and the bottom of the plug-in plate is used to lean against the surface of the bottom plate after moving downward. A lower convex plate is welded to the top of the inner wall of the detection tank, and a spring is connected to one side of the lower convex plate. The other end of the spring is connected to a flip arm, and the end shaft of the flip arm is connected to a pressing wheel. The top of the flip arm is hinged on the inner wall of the detection tank.
[0015] Beneficial effects of the present invention: 1. The air tightness detection device for mechanical processing is equipped with a detection tank and a constant pressure component to fill a fixed amount of airflow into the interior of the detection tank, thereby performing air tightness detection on a fixed number and specification of mechanical processing products. During this process, even if some products have serious leakage problems, they can still be detected through the change in airflow pressure after the transfer, so that the device can achieve high-precision detection of subtle leaks and serious leaks.
[0016] 2. When the mechanical processing air tightness detection device detects a leakage problem during the inspection of multiple mechanical processing products of the same specifications, it can use the screening component and the sealing mechanism to push each product one by one and move it to an independent space at one end of the detection tank, and conduct targeted tests again inside the space, so as to achieve the purpose of accurately judging the product after the leakage is found.
[0017] 3. The air tightness detection device for mechanical processing can trigger the sealing mechanism at the top through the driving mechanism at the bottom when pushing the products one by one for inspection, thereby completing the independent pushing and sealing process of the mechanically processed products, improving the utilization rate of power equipment, reducing equipment costs, and having a higher degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic structural diagram of the appearance of an airtightness detection device for machining according to the present invention; Figure 2 It is a side sectional view of the detection tank of the present invention; Figure 3 This is an exploded view of the constant pressure component of the present invention; Figure 4 It is a structural schematic diagram of the driving mechanism part of the present invention; Figure 5 for Figure 1 Enlarged view of area A in the middle; Figure 6 It is a structural schematic diagram of the closing mechanism part of the present invention; Figure 7 for Figure 2 Enlarged view of area B in the middle; Figure 8 It is a structural schematic diagram of the screening component part of the present invention; In the figure: 1. detection tank; 2. constant pressure assembly; 3. driving mechanism; 4. closing mechanism; 5. screening assembly; 6. driving bin; 7. pressure gauge; 8. lower convex plate; 9. flip arm; 10. spring; 11. pressing wheel; 12. material removal baffle; 13. pressure tank; 14. rear baffle; 15. electric telescopic rod; 16. piston plate; 17. connecting pipe; 18. solenoid valve; 19. end plate; 20. motor; 21. support frame; 22. driving shaft; 23. gear; 24. pushing wheel; 25. rack; 26. guide sleeve; 27. transmission frame; 28. top sealing strip; 29. partition; 30. bottom sealing strip; 31. plug-in board; 32. cover plate; 33. threaded sleeve; 34. handwheel; 35. screw; 36. top plate; 37. splint; 38. groove; 39. bottom plate. DETAILED DESCRIPTION
[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.
[0020] See also Figures 1 to 8The present invention provides the following technical solutions: an airtightness detection device for machining, comprising an airtightness detection device body, the airtightness detection device body comprising a detection tank 1, a constant pressure component 2, a driving mechanism 3 and a closing mechanism 4, a screening component 5 is installed at one end of the detection tank 1, a cover plate 32 is provided on the surface of the screening component 5, a threaded sleeve 33 is inserted through the surface of the cover plate 32, a driving chamber 6 is integrally formed at the bottom of the detection tank 1, the driving mechanism 3 passes through the interior of the driving chamber 6, a strip hole is opened on the top of the detection tank 1, and the closing mechanism 4 is provided. The mechanism 4 passes through the strip-shaped hole at the top of the detection tank 1, and a rack 25 is integrally formed on the side of the closing mechanism 4. The rack 25 is partially connected to the driving mechanism 3. One end of the constant pressure assembly 2 is connected to a connecting pipe 17, and a solenoid valve 18 is installed in the middle of the connecting pipe 17. The interior of the constant pressure assembly 2 is connected to the interior of the detection tank 1 through the connecting pipe 17. A pressure gauge 7 is installed at the top of the detection tank 1, and a material removal baffle 12 is installed at the other end of the detection tank 1. The end of the connecting pipe 17 is connected to the area of the detection tank 1 above the material removal baffle 12. The constant pressure assembly 2 includes a pressure tank 13, a rear baffle 14 and a piston plate 16. An electric telescopic rod 15 is installed in the middle of the rear baffle 14. The end of the electric telescopic rod 15 is screwed to the piston plate 16. The piston plate 16 and the end of the electric telescopic rod 15 are both embedded in the interior of the pressure tank 13, and the side of the piston plate 16 fits the inner wall of the pressure tank 13. The air tightness detection device is used to perform airtightness tests on products of uniform specifications and models produced by mechanical processing, including metal structures with sealed cavities such as sealed boxes and sealed pipes.
[0021] When the present invention is used, by setting up a detection tank 1 and a constant pressure component 2, a fixed amount of airflow is filled into the interior of the detection tank 1, thereby performing airtightness testing on a fixed number and specification of mechanically processed products. In this process, even if some products have serious leakage problems, they can also be detected by the change in airflow pressure after the transfer, so that the device can achieve high-precision detection functions for minor leaks and serious leaks. Specifically, before use, the present invention first obtains the volume of the workpiece to be tested, then counts the total amount of each batch of workpieces to be tested, calculates the total occupied volume inside the detection tank 1, and then subtracts the total volume of the workpieces put in from the total volume of the detection tank 1 to obtain the specific size of the air volume inside the detection tank 1, controls the pressure tank 13 in the constant pressure component 2 to provide an air filling space equal to the above-calculated air filling volume, and injects airflow into the constant pressure component 2 through an external high-pressure air pump and reaches a fixed pressure value. After the detection tank 1 is completely closed, the interior of the detection tank 1 is vacuumed, and the solenoid valve 18 is opened to fill the airflow inside the constant pressure component 2 into the interior of the detection tank 1. If there are no leaks in this batch of workpieces, the pressure tank 13 is controlled to provide an air filling space equal to the above-calculated air filling volume, and the pressure tank 13 is controlled to provide an air filling space equal to the above-calculated air filling volume, and the pressure tank 1 is completely closed. The pressure tank 1 is completely vacuumed, and the solenoid valve 18 is opened to fill the airflow inside the constant pressure component 2 into the interior of the detection tank 1. If there are no leaks in this batch of workpieces, the pressure tank 13 is controlled to provide an air filling space equal to the above-calculated air filling volume, and the pressure tank 13 is controlled to provide an air filling space equal to the above-calculated air filling volume, and the pressure tank 1 is completely If there is leakage, the internal pressure value of the detection tank 1 is consistent with the initial pressure value inside the pressure tank 13. If there is a decrease, it means that there is a serious leakage problem in the batch of workpieces. If the pressure remains unchanged at the beginning of the measurement and then slowly decreases, it means that there is a slight leakage in the batch of workpieces. After the leakage problem is detected, the screening component 5 and the driving mechanism 3 can be controlled to push each workpiece one by one to the side of the closing mechanism 4, and the above process is repeated. However, in this screening stage, it is necessary to control the size of the air-filled cavity inside the pressure tank 13 and adjust it to a volume size that matches the targeted measurement area on the side of the closing mechanism 4 (rather than the volume size required for measuring the entire batch of workpieces as mentioned above). This is done until the specific workpiece with a leak is detected.
[0022] In this embodiment, the drive mechanism 3 includes a motor 20, a drive shaft 22, and a push wheel 24. A support frame 21 is welded to the surface of the drive chamber 6, an end plate 19 is welded to the end of the support frame 21, a motor 20 is screwed to the surface of the end plate 19, and a drive shaft 22 is inserted into the output end of the motor 20. The surface of the drive shaft 22 is keyed to a gear 23, and a push wheel 24 is welded to the middle of the drive shaft 22. There are two gears 23, and the two gears 23 are symmetrically mounted on both sides of the push wheel 24. The surface of the push wheel 24 is mounted with an anti-slip pad, and the top of the push wheel 24 penetrates into the interior of the inspection tank 1 from the top of the drive chamber 6. Through the drive mechanism 3 at the bottom, when the products are pushed and inspected one by one, the top sealing mechanism 4 can be triggered in conjunction, thereby completing the independent pushing and sealing process of the machined products, improving the utilization rate of the power equipment, reducing the equipment cost, and achieving a higher degree of automation.
[0023] Specifically, after starting the motor 20, the motor 20 drives the drive shaft 22 to rotate, and the drive shaft 22 drives the gear 23 and the pushing wheel 24 on the surface to rotate. The gear 23 can trigger the subsequent closing mechanism 4 to descend through the meshing effect with the rack 25. At the same time, the top of the pushing wheel 24 contacts the bottom surface of the workpiece to be tested, thereby achieving the purpose of pushing the last workpiece, so that the last workpiece can be separated from the second workpiece, so that the top closing mechanism 4 can smoothly block the last workpiece after moving down, so as to facilitate the subsequent targeted sealing test of the workpiece.
[0024] In this embodiment, the sealing mechanism 4 includes a rack 25, a transmission frame 27, and a partition 29. The top of the rack 25 is integrally formed with the transmission frame 27. A top sealing strip 28 is welded to one end of the transmission frame 27. A partition 29 is welded to the bottom of the top sealing strip 28. A bottom sealing strip 30 is welded to the bottom of the partition 29. A plug-in board 31 is integrally formed at the bottom end of the bottom sealing strip 30. A guide sleeve 26 is welded to the side of the test tank 1. The bottom of the transmission frame 27 passes through the interior of the guide sleeve 26, and the inner wall of the guide sleeve 26 is in contact with the surface of the transmission frame 27. The rack 25 is engaged with the side of the gear 23, the top sealing strip 28 is used to press on the top of the strip hole on the top of the detection tank 1, and the bottom sealing strip 30 is used to lean against the inner wall of the strip hole on the top of the detection tank 1. The partition 29 and the plug-in board 31 are used to divide the internal cavity of the detection tank 1, and the internal volume of the detection tank 1 is larger than the volume inside the pressure tank 13.
[0025] Specifically, after starting the motor 20, the gear 23 and the rack 25 drive the rack 25 toward the bottom, and then the transmission frame 27 at the top moves the entire partition 29 downward until the bottom plug-in plate 31 is pressed against the surface of the bottom plate 39. At the same time, the plug-in plate 31 is embedded in the groove 38 of the clamping plate 37, which directly divides the interior of the test tank 1 into two areas. The top of the partition 29 is sealed with the top sealing strip 28 to seal the opening for lifting. The motor 20 always provides a squeezing effect to ensure that the interior of the test tank 1 can still maintain an efficient sealing state. In this state, the subsequent targeted sealing test process of the workpiece can be carried out.
[0026] In this embodiment, the screening assembly 5 includes a cover plate 32, a screw rod 35, and a clamping plate 37. The screw rod 35 passes through the interior of the threaded sleeve 33, and a handwheel 34 is welded to one end of the screw rod 35. The other end of the screw rod 35 is screwed to a support plate 36. A sealing layer is attached to the side of the support plate 36 close to the screw rod 35, and one side of the support plate 36 is used to rest on the surface of the workpiece to be tested, and the other side of the support plate 36 is used to be pressed and fitted on the inner wall of the cover plate 32. The inner side of the clamping plate 37 is used to place the workpiece to be tested, and a groove 38 is provided on the top of the clamping plate 37. The bottom of the detection tank 1 is provided with a bottom plate 39, and a notch is provided on the surface of the bottom plate 39. The bottom of the clamping plate 37 is used to fit into the notch on the bottom plate 39. The plug-in board 31 is used to be embedded in the interior of the groove 38, and the bottom of the plug-in board 31 is used to rest against the surface of the bottom plate 39 after being moved downward. A lower convex plate 8 is welded to the top end of the inner wall of the detection tank 1. A spring 10 is connected to one side of the lower convex plate 8, and a flip arm 9 is connected to the other end of the spring 10. The end of the flip arm 9 is axially connected to a pressing wheel 11, and the top end of the flip arm 9 is hinged to the inner wall of the detection tank 1. When a leakage problem is detected during the inspection of multiple machined products of uniform specifications, each product can be pushed one by one with the help of the screening component 5 and the sealing mechanism 4, and moved to an independent space at one end of the interior of the detection tank 1. Targeted testing can be carried out again inside the space, so as to achieve the purpose of accurately determining the product after the leakage is found.
[0027] Specifically, multiple workpieces to be tested are placed inside in order through two clamping plates 37, and each workpiece is placed inside the test tank 1 by closing the cover 32. After all workpieces pass the test, they can be taken out by opening the cover 32. In this process, the sealing gasket on one side of the supporting plate 36 is pressed against the inner side of the threaded sleeve 33 to seal the area through which the screw rod 35 passes. If a leakage problem is found, the hand wheel 34 is turned to support one end of the arranged workpieces, and the workpiece at the other end is supported until it moves above the pushing wheel 24. At this time, the motor 20 is started. , carry out the above-mentioned movement process of the driving mechanism 3 and the closing mechanism 4, the last workpiece can be pushed to one side of the partition 29, and the workpiece can be independently sealed by the closing mechanism 4, and the airflow conveying process of the constant pressure component 2 is repeated to detect the workpiece. After completing the detection of the workpiece, the material removal baffle 12 can be opened separately to take out the workpiece after the test, and then reversely control the rotation of the motor 20 to open the closing mechanism 4, repeat the above process, and turn the handwheel 34 to continue pushing the subsequent workpieces until the independent detection process of each workpiece in the batch is completed. During the pushing process of the workpiece of the above-mentioned pushing wheel 24, the top spring 10 will also pull the flip arm 9, and the bottom pressing wheel 11 will be pressed against the top of the workpiece, cooperating with the bottom pushing wheel 24 to achieve the purpose of pushing the workpiece.
[0028] The basic principles, main features and advantages of the present invention are shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.
[0029] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. An airtightness detection device for machining, comprising an airtightness detection device body, characterized in that: The airtightness detection device body comprises a detection tank (1), a constant pressure assembly (2), a driving mechanism (3) and a closing mechanism (4); a screening assembly (5) is installed at one end of the detection tank (1); a cover plate (32) is provided on the surface of the screening assembly (5); a threaded sleeve (33) is inserted through the surface of the cover plate (32); a driving chamber (6) is integrally formed at the bottom of the detection tank (1); the driving mechanism (3) passes through the interior of the driving chamber (6); a strip hole is provided at the top of the detection tank (1); the closing mechanism (4) passes through the interior of the strip hole at the top of the detection tank (1), and the closing mechanism (4) passes through the interior of the strip hole at the top of the detection tank (1). A rack (25) is integrally formed on the side of the closing mechanism (4), and the rack (25) is partially connected to the driving mechanism (3). One end of the constant pressure component (2) is connected to a connecting pipe (17), and a solenoid valve (18) is installed in the middle of the connecting pipe (17). The interior of the constant pressure component (2) is connected to the interior of the detection tank (1) through the connecting pipe (17). A pressure gauge (7) is inserted at the top of the detection tank (1), and a material removal baffle (12) is installed at the other end of the detection tank (1). The end of the connecting pipe (17) is connected to the detection tank (1) area above the material removal baffle (12).
2. The airtightness detection device for machining according to claim 1, characterized in that: The constant pressure assembly (2) includes a pressure tank (13), a rear baffle (14) and a piston plate (16); a support frame (21) is welded to the surface of the drive chamber (6); an end plate (19) is welded to the end of the support frame (21); an electric telescopic rod (15) is inserted in the middle of the rear baffle (14); the end of the electric telescopic rod (15) is screwed to the piston plate (16); the piston plate (16) and the end of the electric telescopic rod (15) are both embedded in the interior of the pressure tank (13), and the side of the piston plate (16) is in contact with the inner wall of the pressure tank (13).
3. The airtightness detection device for machining according to claim 2, characterized in that: The driving mechanism (3) comprises a motor (20), a driving shaft (22) and a pushing wheel (24); the motor (20) is screwed onto the surface of the end plate (19); and the driving shaft (22) is inserted into the output end of the motor (20).
4. The airtightness detection device for machining according to claim 3, characterized in that: The surface of the driving shaft (22) is keyed to a gear (23), and a push wheel (24) is welded in the middle of the driving shaft (22). There are two gears (23), and the two gears (23) are symmetrically mounted on both sides of the push wheel (24). The surface of the push wheel (24) is mounted with an anti-slip pad, and the top of the push wheel (24) penetrates into the interior of the detection tank (1) from the top of the driving chamber (6).
5. The airtightness detection device for machining according to claim 3, characterized in that: The closing mechanism (4) comprises a rack (25), a transmission frame (27) and a partition (29), wherein the top of the rack (25) is integrally formed with the transmission frame (27), one end of the transmission frame (27) is welded with a top sealing strip (28), the bottom of the top sealing strip (28) is welded with a partition (29), the bottom of the partition (29) is welded with a bottom sealing strip (30), and the bottom end of the bottom sealing strip (30) is integrally formed with a plug-in board (31).
6. The airtightness detection device for machining according to claim 5, characterized in that: A guide sleeve (26) is welded to the side of the detection tank (1), the bottom of the transmission frame (27) passes through the inside of the guide sleeve (26), and the inner wall of the guide sleeve (26) is in contact with the surface of the transmission frame (27).
7. The airtightness detection device for machining according to claim 6, characterized in that: The rack (25) is meshed with the side of the gear (23), the top sealing strip (28) is used to press on the top of the strip hole of the detection tank (1), the bottom sealing strip (30) is used to lean against the inner wall of the strip hole of the top of the detection tank (1), the partition (29) and the plug-in plate (31) are used to divide the internal cavity of the detection tank (1), and the internal volume of the detection tank (1) is larger than the internal volume of the pressure tank (13).
8. The airtightness detection device for machining according to claim 5, characterized in that: The screening assembly (5) includes a cover plate (32), a screw rod (35) and a clamping plate (37), wherein the screw rod (35) passes through the interior of the threaded sleeve (33), and a hand wheel (34) is welded to one end of the screw rod (35), and a supporting plate (36) is screwed to the other end of the screw rod (35), and a sealing layer is attached to the side of the supporting plate (36) close to the screw rod (35), and one side of the supporting plate (36) is used to lean against the surface of the workpiece to be measured, and the other side of the supporting plate (36) is used to be pressed and fitted on the inner wall of the cover plate (32).
9. The airtightness detection device for machining according to claim 8, characterized in that: The inner side of the clamping plate (37) is used to place the workpiece to be tested, and a groove (38) is provided on the top of the clamping plate (37). The bottom of the detection tank (1) is provided with a bottom plate (39), and a notch is provided on the surface of the bottom plate (39). The bottom of the clamping plate (37) is used to be embedded in the notch on the bottom plate (39).
10. The airtightness detection device for machining according to claim 9, characterized in that: The plug-in plate (31) is used to be embedded in the interior of the groove (38), and the bottom of the plug-in plate (31) is used to lean against the surface of the bottom plate (39) after being moved downward. A lower convex plate (8) is welded to the top of the inner wall of the detection tank (1), one side of the lower convex plate (8) is connected to a spring (10), the other end of the spring (10) is connected to a flip arm (9), the end shaft of the flip arm (9) is connected to a pressing wheel (11), and the top end of the flip arm (9) is hinged to the inner wall of the detection tank (1).