Air tightness detection method and air tightness detection equipment
By recording the pressure in the syringe barrel and the distance of the push rod moving, comparing the pressure-distance curve with the ideal state curve, the problem of difficulty in detecting syringe leakage in the prior art is solved, and efficient detection of the air tightness of the syringe and accurate positioning of the leakage point is achieved.
Patent Information
- Application Number
- CN202311614501.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-29
- Publication Date
- 2025-05-30
AI Technical Summary
The prior art is difficult to effectively detect whether there is a leakage in the syringe during the entire use, and it is impossible to accurately locate the leakage point.
By recording the starting pressure in the syringe barrel and the distance of the push rod moving, combining the comparison of the pressure-distance curve with the ideal state curve, we can determine whether there is leakage in the syringe and accurately locate the leakage point.
The airtightness detection of the syringe during the entire use process is realized, and the leakage point can be accurately positioned, which improves the accuracy and efficiency of detection.
Smart Images
Figure CN120063619A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a method for detecting airtightness and an airtightness detection device. Background Art
[0002] A syringe is a common pump tool for extracting or injecting gas or liquid, which generally includes components such as a barrel, a push rod, and a piston. The piston contacts the inner wall of the barrel to form a seal. If there are surface defects such as pits and protrusions on the inner wall of the barrel, or the roundness and straightness of the inner diameter of the barrel do not meet the dimensional requirements, the seal will fail and the syringe will have a leakage problem.
[0003] Currently, the inner wall of the barrel can be magnified and observed for surface defects through an endoscope. However, for syringes with a small inner diameter, direct observation is not possible. In addition, the roundness and straightness of the inner diameter of the barrel are generally measured by a pneumatic gauge, usually only measuring a few points, and it is impossible to measure the entire stroke range of the syringe. Summary of the Invention
[0004] In view of this, the present application provides a method for detecting airtightness and an airtightness detection device to detect whether there is leakage in the entire stroke (during use) of the syringe waiting for the detection instrument and accurately locate the leakage point.
[0005] An embodiment of the present application provides a method for detecting the airtightness of a device under test, where the device under test includes a barrel and a push rod extending from the barrel, and the push rod is configured to be movable within the barrel. The airtightness detection method includes:
[0006] Recording the initial pressure P in the barrel of the device under test 0 , pushing the push rod of the device under test, and recording the distance L that the push rod moves within the barrel 1 , L 2 ……L n-1 , L n and the corresponding pressure P in the barrel at each distance 1 , P 2 ……P n-1 , P n , n≥1;
[0007] If within the stroke from L n-1 to L n , the pressure P n-1 to P n shows a downward trend, then the device under test leaks within the stroke from L n-1 to L n .
[0008] In one embodiment, the push rod moves uniformly within the barrel under the drive of a driving device.
[0009] In one embodiment, one end of the syringe is in communication with a pressure detection device, and the pressure detection device is configured to detect the pressure inside the syringe.
[0010] In one embodiment, the initial pressure P inside the syringe 0 is greater than or equal to the atmospheric pressure.
[0011] One embodiment of the present application provides a method for detecting the airtightness of a device under test, the airtightness detection method comprising:
[0012] Recording the initial pressure inside the syringe of the device under test as P 0 , pulling the push rod of the device under test, and recording the distance L that the push rod moves inside the syringe 1 , L 2 ... L n-1 , L n and the corresponding pressure P inside the syringe at each distance 1 , P 2 ... P n-1 , P n , n ≥ 1;
[0013] If, within the stroke from L n-1 to L n , the pressure P n-1 to P n shows an upward trend, then the device under test leaks within the stroke from L n-1 to L n .
[0014] In one embodiment, the push rod moves uniformly inside the syringe under the drive of a drive device.
[0015] In one embodiment, one end of the syringe is in communication with a pressure detection device, and the pressure detection device is configured to detect the pressure inside the syringe.
[0016] In one embodiment, the initial pressure P inside the syringe 0 is less than or equal to the atmospheric pressure.
[0017] An embodiment of the present application provides an airtightness detection device for detecting the airtightness of a device under test. The device under test includes a syringe barrel, a push rod, and a piston. The push rod extends out of the syringe barrel and is configured to be movable within the syringe barrel. One end of the push rod located within the syringe barrel is provided with the piston, and the piston contacts the inner wall of the syringe barrel. The airtightness detection device includes a pressure detection device, a fixing device, and a driving device. The pressure detection device is connected to one end of the syringe barrel away from the push rod, and the pressure detection device is used to detect the pressure within the syringe barrel. The fixing device is provided with a mounting block, one end of the syringe barrel away from the push rod is fixed to the mounting block, and the pressure detection device is fixed to the mounting block. One end of the push rod away from the piston is connected to the driving device, and the driving device is used to drive the push rod to move within the syringe barrel.
[0018] In one embodiment, the driving device is mounted on the fixing device. The driving device is provided with a connecting portion, one end of the push rod away from the piston is connected to the connecting portion, and the connecting portion is configured to be movable under the drive of the driving device.
[0019] The present application determines whether there is a leak in the device under test by detecting the distance the push rod moves and the pressure data, and judging whether the trend of the detected distance-pressure curve matches the trend of the ideal state curve. The present application can not only detect whether there is a leak in the device under test during the entire stroke (the entire use process), but also accurately locate the leak point. Description of the Drawings
[0020] Figure 1 It is a schematic structural diagram of a syringe provided by an embodiment of the present application.
[0021] Figure 2 It is a curve graph between the pressure within the syringe and the distance the push rod is pushed provided by an embodiment of the present application.
[0022] Figure 3 It is a curve graph between the pressure within the syringe and the distance the push rod is pulled provided by another embodiment of the present application.
[0023] Figure 4 It is a schematic structural diagram of the airtightness detection device provided by an embodiment of the present application.
[0024] Description of the Main Element Symbols
[0025] Syringe 1
[0026] Syringe barrel 11
[0027] Push rod 12
[0028] Piston 13
[0029] Air-tightness detection device 100
[0030] Pressure detection device 10
[0031] Fixing device 20
[0032] Driving device 30
[0033] Mounting block 201
[0034] Connecting part 301
[0035] The following specific embodiments will further illustrate the embodiments of the present application in conjunction with the above-mentioned drawings. Specific embodiments
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the embodiments of the present application belong. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present application.
[0037] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.
[0038] It will be understood that when a layer is referred to as being "on" another layer, it can be directly on the other layer or there can be an intermediate layer therebetween. In contrast, when a layer is referred to as being "directly on" another layer, there is no intermediate layer.
[0039] It should be noted that when a component is referred to as being "fixed to" or "mounted on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The term "and / or" used herein includes all and any combinations of one or more of the related listed items.
[0040] The following will describe in detail some embodiments of the present application in conjunction with the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0041] The present application provides an air-tightness detection method for detecting a device under test, and the device under test can be, but is not limited to, a syringe. The following air-tightness detection method will be described by taking a syringe as an example of the device under test. Please refer to Figure 1, the syringe 1 may include a barrel 11 and a plunger 12. The plunger 12 extends from the barrel 11 and is movable within the barrel 11. One end of the plunger 12 located within the barrel 11 may be provided with a piston 13, and the piston 13 contacts the inner wall of the barrel 11 to form a seal.
[0042] According to the ideal gas law, under the condition of constant temperature, P 0 V 0 = P 1 V 1 (Equation 1). Wherein, P 0 is the initial gas pressure (kPa) within the barrel 11 of the syringe 1, and P 0 may be equal to or higher than the atmospheric pressure (approximately 100 kPa); V 0 is the initial gas volume (μL) within the barrel 11, that is, the volume of the gas between the piston 23 and the end of the barrel 11 remote from the plunger 12; P 1 is the pressure (kPa) within the barrel 11 after the plunger 12 is pushed inward; V 1 is the gas volume (μL) within the barrel 11 after the plunger 12 is pushed inward. That is, under the condition of constant temperature, the product of the pressure and the gas volume within the barrel 11 before the plunger 12 is pushed should be equal to the product of the pressure and the gas volume within the barrel 11 after the push. According to V 1 = V 0 - AL (Equation 2), Equation 1 can be converted to Wherein, A is the cross-sectional area (mm 2 ) of the barrel 11, and L is the distance (mm) that the plunger 12 is pushed inward within the barrel 11.
[0043] As can be seen from Equation 3, when there is no leakage in the barrel 11 of the syringe 1, P1 and L will follow the ideal state equation, and the pressure P1 within the barrel 11 will increase as the pushing distance L of the plunger 12 increases. There is a positive correlation between P1 and L, as shown by the curve S1 in Figure 2 . The curve S1 is the standard curve of a syringe without leakage. In the curve S1, the abscissa is the pushing distance of the plunger 12, and the ordinate is the corresponding pressure. In this embodiment, the starting pressure is the atmospheric pressure (100 kPa), the plunger 12 can be in a state where it is fully pulled out and cannot be pulled out further, and the pressure is recorded every time the plunger 12 is pushed 1 mm. In other embodiments, the distance interval can also be reduced to obtain more pressure data and make the curve S1 more refined. In other embodiments, the starting pressure can also be higher than the atmospheric pressure, in which case the plunger 12 has already been pushed a certain distance within the barrel 11.
[0044] According to Equation (3), the present application proposes a method for detecting the airtightness of a syringe. If, after the push rod is pushed, the trend of the pressure-distance curve does not conform to the ideal state curve S1. For example, if the pressure decreases instead as the pushing distance increases, it can be determined that the syringe barrel (syringe) leaks within this stroke.
[0045] The airtightness detection method includes: recording the initial pressure P in the syringe barrel 0 , then pushing the push rod and recording the distance L that the push rod moves in the syringe barrel 1 , L 2 ……L n-1 , L n and the corresponding pressure P in the syringe barrel at each distance 1 , P 2 ……P n-1 , P n , where n≥1. For example, the pressure can be recorded every time the push rod is pushed 1 mm. When pushed 1 mm, the distance is recorded as L 1 , and the pressure at this time is recorded as P 1 ; when pushed 2 mm, the distance is recorded as L 2 , and the pressure at this time is recorded as P 2 ; when pushed n mm, the distance is recorded as L n , and the pressure at this time is recorded as P n , and so on. If within the stroke from L n-1 to L n , the pressure P n-1 to P n shows a downward trend, then the syringe leaks within the stroke from L n-1 to L n .
[0046] In some embodiments, the push rod can move uniformly in the syringe barrel under the drive of a driving device, and the driving device can be, but is not limited to, a motor, etc.
[0047] In some embodiments, one end of the syringe barrel can be connected to a pressure detection device to detect the pressure in the syringe barrel. The pressure detection device can be connected to the end of the syringe barrel away from the push rod, and the pressure detection device can be, but is not limited to, a pressure sensor.
[0048] Figure 2 The curve S2 of 0Atmospheric pressure, the push rod is completely pulled out and cannot be pulled out any further at the beginning. During the test, the pressure is recorded every time the push rod is pushed 1mm. As shown in curve S2, within the stroke of 12mm to 15mm when the push rod is pushed, the pressure of the syringe shows a downward trend, which is inconsistent with the pressure trend corresponding to the 12mm to 15mm stroke segment in the standard curve S1. Therefore, it is determined that the syringe of curve S2 has a leak within the 12mm to 15mm stroke segment. Within the stroke of 16mm to 60mm when the push rod is pushed, the pressure of curve S2 keeps rising, which is consistent with the trend of standard curve S1, indicating that the syringe has no leak within this stroke segment.
[0049] Figure 2 The curve S3 shows the pressure-distance curve of another syringe to be tested. The initial state of the syringe is the same as the initial state of the standard curve, and the initial pressure P 0 Atmospheric pressure, the push rod is completely pulled out and cannot be pulled out any further at the beginning. During the test, the pressure is recorded every time the push rod is pushed 1mm. As shown in curve S3, within the stroke of 12mm to 15mm for the push rod, the pressure of the syringe shows a downward trend, which is inconsistent with the pressure trend corresponding to the 12mm to 15mm stroke segment in the standard curve S1. Therefore, it is determined that the syringe of curve S2 has a leak within the 12mm to 15mm stroke segment. Within the stroke of 16mm to 35mm for the push rod, the pressure of curve S2 has been rising, which is consistent with the trend of standard curve S1, indicating that the syringe has no leakage within this stroke. That is, within the stroke of 0mm to 35mm for the push rod, curve S3 overlaps with curve S2. However, within the travel distance of 36mm to 42mm, the pressure of the syringe shows a downward trend, which is inconsistent with the pressure trend corresponding to the 36mm to 42mm travel section in the standard curve S1. Therefore, it is determined that the syringe of curve S3 has leakage within the 36mm to 42mm travel section. Within the travel distance of 43mm to 60mm, the pressure of curve S3 has been rising, which is consistent with the trend of standard curve S1, indicating that the syringe has no leakage within this travel section. It can be seen that the syringe of curve S3 has two leakage sections, namely, leakage in the heating travel sections of 12mm to 15mm and 36mm to 42mm.
[0050] The above embodiment describes how to determine whether the syringe has leakage when the push rod is pushed into the syringe. The following embodiment will describe how to determine whether the syringe has leakage when the push rod is pulled out of the syringe.
[0051] According to the ideal gas state equation, under the condition of constant temperature, P 0 V 0 =P 1 V 1 (Formula 1). Where, P 0is the initial gas pressure (kPa) in the syringe barrel 11 of the syringe 1 (see Figure 1 ), P 0 can be equal to or less than the atmospheric pressure (roughly 100 kPa); V 0 is the initial gas volume (μL) in the syringe barrel 11, that is, the volume of the gas between the piston 23 and the end of the syringe barrel 11 away from the push rod 12; P 1 is the pressure (kPa) in the syringe barrel 11 after the push rod 12 is pulled outwards; V 1 is the gas volume (μL) in the syringe barrel 11 after the push rod 12 is pulled outwards. That is, under the condition of constant temperature, the product of the pressure and the gas volume in the syringe barrel 11 before the push rod 12 is pulled should be equal to the product of the pressure and the gas volume in the syringe barrel 11 after pulling. According to V 1 = V 0 + AL (Equation 4), Equation 1 can be converted to where A is the cross-sectional area (mm 2 ) of the syringe barrel 11, and L is the distance (mm) that the push rod 12 is pulled outwards in the syringe barrel 11.
[0052] It can be seen from Equation 5 that when there is no leakage in the syringe barrel 11 of the syringe 1, P1 and L will follow the ideal gas law, and the pressure P1 in the syringe barrel 11 will decrease as the pulling distance L of the push rod 12 increases. There is a negative correlation between P1 and L, as shown by the curve K1 in Figure 3 . The curve K1 is the standard curve of a syringe without leakage. In the curve K1, the abscissa is the distance that the push rod 12 is pulled, and the ordinate is the corresponding pressure. In this embodiment, the starting pressure is the atmospheric pressure (100 kPa), the push rod can be in a state where it cannot be pushed in further, and the pressure is recorded every time the push rod 12 is pulled 1 mm. In other embodiments, the distance interval can also be reduced to obtain more pressure data and make the curve K1 more precise. In other embodiments, the starting pressure can also be lower than the atmospheric pressure, and at this time, the push rod 12 has been pulled a certain distance in the syringe barrel 11.
[0053] According to Equation (5), the present application proposes a method for detecting the airtightness of a syringe. If after the push rod is pulled, the trend of the pressure-distance curve does not conform to the ideal state curve K1, for example, as the pushing distance increases, the pressure increases instead, it can be determined that the syringe barrel (syringe) leaks within this stroke.
[0054] The airtightness detection method includes: recording the initial pressure P in the syringe barrel 0 , then pulling the push rod and recording the distance L that the push rod moves in the syringe barrel 1 , L 2 ……L n-1 , L n and the corresponding pressure P in the syringe barrel at each distance1 ,P 2 ……P n-1 ,P n ,n≥1. For example, the pressure can be recorded once every 1 mm of the push rod is pulled. When the push rod is pulled 1 mm, the distance is recorded as L 1 ,and the pressure at this time is recorded as P 1 ; when the push rod is pulled 2 mm, the distance is recorded as L 2 ,and the pressure at this time is recorded as P 2 ; when the push rod is pulled n mm, the distance is recorded as L n ,and the pressure at this time is recorded as P n ,and so on. If within the stroke from L n-1 to L n , the pressure P n-1 to P n shows an upward trend, then the syringe leaks within the stroke from L n-1 to L n .
[0055] Figure 3 The curve K2 of Figure 3 shows the pressure - distance curve of a syringe to be detected. The starting state of this syringe is the same as that of the standard curve, and the starting pressure P 0 is the atmospheric pressure, and the push rod can be in a state where it cannot be pushed further in at the start. During the detection process, the pressure can be recorded once every 1 mm of the push rod is pulled. As shown by the curve K2, within the stroke where the push rod is pulled approximately 12 mm to 15 mm, the pressure of this syringe shows an upward trend, which does not match the pressure trend corresponding to the 12 mm to 15 mm stroke segment in the standard curve K1. Therefore, it is determined that the syringe corresponding to the curve K2 leaks within the 12 mm to 15 mm stroke segment. Within the stroke where the push rod is pulled approximately 16 mm to 60 mm, the pressure of the curve K2 has been decreasing, which is consistent with the trend of the standard curve K1, indicating that the syringe does not leak within this stroke segment.
[0056] Figure 3 The curve K3 of Figure 3 shows the pressure - distance curve of another syringe to be detected. Within the stroke where the push rod of this syringe is pulled from 0 mm to 35 mm, its curve K3 completely overlaps with the curve K2. However, within the stroke where the push rod is pulled from 36 mm to 42 mm, the pressure of this syringe shows an upward trend again, which does not match the pressure trend corresponding to the 36 mm to 42 mm stroke segment in the standard curve K1. Therefore, it is determined that the syringe corresponding to the curve K3 leaks within the 36 mm to 42 mm stroke segment. Within the stroke where the push rod is pushed from 43 mm to 60 mm, the pressure of the curve K3 has been increasing, which is consistent with the trend of the standard curve K1, indicating that the syringe does not leak within this stroke segment. It can be seen that the syringe corresponding to the curve K3 has two leakage segments, that is, it leaks within the 12 mm to 15 mm and 36 mm to 42 mm stroke segments.
[0057] Please refer to Figure 4 , this application also provides an airtightness detection device 100, which is used to detect the airtightness of the instrument to be tested. The instrument to be tested can be, but is not limited to, a syringe. The instrument to be tested may include a syringe barrel 11, a push rod 12 and a piston 13. The push rod 12 extends out of the syringe barrel 11 and can move within the syringe barrel 11. A piston 13 is provided at one end of the push rod 12 located within the syringe barrel 11, and the piston 13 contacts the inner wall of the syringe barrel 11 and forms a seal. The airtightness detection device 100 includes a pressure detection device 10, a fixing device 20 and a driving device 30.
[0058] The pressure detection device 10 is connected to the end of the syringe barrel 11 away from the push rod 12, and the pressure detection device 10 is used to detect the pressure inside the syringe barrel 11. The pressure detection device 10 can be, but is not limited to, a pressure sensor. The fixing device 20 is provided with a mounting block 201, and the end of the syringe barrel 11 away from the push rod 12 is fixed to the mounting block 201. The pressure detection device 10 is fixed to the mounting block 201 and is connected to the syringe barrel 11 through the mounting block 201. The syringe barrel 11 and the pressure detection device 10 are fixed through the mounting block 201, and the connection between the syringe barrel 11 and the pressure detection device 10 is realized. The structure is simple and stable. One end of the push rod 12 away from the piston 13 is connected to the driving device 30, and the driving device 30 is used to drive the push rod 12 to move within the syringe barrel 11 (for example, push or pull out).
[0059] In some embodiments, as Figure 4 shown, the driving device 30 can be installed on the fixing device 20. The driving device 30 is provided with a connecting portion 301, and the connecting portion 301 is generally plate-shaped. One end of the push rod 12 away from the piston 13 is connected to the connecting portion 301, and the connecting portion 301 moves under the drive of the driving device 30, thereby driving the push rod 12 to move.
[0060] During use, fix the end of the syringe barrel 11 away from the push rod 12 on the mounting block 201, and also fix the pressure detection device 10 on the mounting block 201, and connect the syringe barrel 11 to the pressure detection device 10. Install the driving device 30 on the fixing device 20, and connect one end of the push rod 12 away from the piston 13 to the connecting portion 301 of the driving device 30. Then, record the pressure in the initial state of the syringe barrel 11, and then start the driving device 30 to drive the push rod 12 to move at a constant speed (push in or pull out within the syringe barrel 11), and record the pressure at each moving distance in real time. Finally, the distance and pressure data can be plotted into a curve as Figure 2 or Figure 3 shown, and check whether the curve trend is consistent with the trend of the standard curve, so as to judge whether there is leakage.
[0061] This application determines whether there is a leak in the instrument under test by detecting the distance and pressure data of the push rod movement and judging whether the trend of the detected distance-pressure curve matches the trend of the ideal state curve. This application can not only detect whether there is a leak in the instrument under test during the entire stroke (the entire usage process), but also accurately locate the leak point.
[0062] The above description is some specific embodiments of this application, but in the actual application process, it cannot be limited to these embodiments only. For those of ordinary skill in the art, other deformations and changes made according to the technical concept of this application should fall within the protection scope of this application.
Claims
1. A method for detecting the airtightness of a device under test, the device under test including a syringe and a push rod extending from within the syringe, the push rod being configured to be movable within the syringe, characterized in that, the airtightness detection method includes: Record the initial pressure P in the syringe of the instrument to be measured 0 , push the push rod of the instrument to be measured, and record the distance L that the push rod moves in the syringe 1 , L 2 ……L n-1 , L n and the corresponding pressure P in the syringe at each distance 1 , P 2 ……P n-1 , P n , n≥1; If within the stroke from L n-1 to L n , the pressure P n-1 to P n shows a downward trend, then there is a leak in the instrument under test within the stroke from L n-1 to L n .
2. The airtightness detection method according to claim 1, characterized in that, the push rod moves uniformly within the syringe under the drive of a drive device.
3. The airtightness detection method according to claim 1, characterized in that, one end of the syringe is connected to a pressure detection device, and the pressure detection device is used to detect the pressure within the syringe.
4. The airtightness detection method according to claim 1, characterized in that, The initial pressure P in the syringe 0 is greater than or equal to the atmospheric pressure.
5. A method for detecting the airtightness of a device under test, the device under test including a syringe and a push rod extending from within the syringe, the push rod being configured to be movable within the syringe, characterized in that, the airtightness detection method includes: Record the initial pressure in the syringe of the instrument to be measured as P 0 , pull the push rod of the instrument to be measured, and record the distance L that the push rod moves in the syringe 1 , L 2 ……L n-1 , L n and the corresponding pressure P in the syringe at each distance 1 , P 2 ……P n-1 , P n , n≥1; If within the stroke from L n-1 to L n , the pressure P n-1 to P n shows an upward trend, then the instrument under test has a leak within the stroke from L n-1 to L n .
6. The airtightness detection method according to claim 5, characterized in that, the push rod moves uniformly within the syringe under the drive of a drive device.
7. The airtightness detection method according to claim 5, characterized in that, one end of the syringe is connected to a pressure detection device, and the pressure detection device is used to detect the pressure within the syringe.
8. The airtightness detection method according to claim 5, characterized in that, The initial pressure P in the syringe 0 is less than or equal to the atmospheric pressure.
9. An airtightness detection device for detecting the airtightness of a device under test, the device under test including a syringe, a push rod and a piston, the push rod extending from within the syringe and being configured to be movable within the syringe, a piston being provided at one end of the push rod within the syringe, and the piston being in contact with the inner wall of the syringe, characterized in that, the airtightness detection device includes: a pressure detection device, the pressure detection device being connected to one end of the syringe away from the push rod, and the pressure detection device being used to detect the pressure within the syringe; a fixing device, the fixing device being provided with a mounting block, one end of the syringe away from the push rod being fixed to the mounting block, and the pressure detection device being fixed to the mounting block; and a drive device, one end of the push rod away from the piston being connected to the drive device, and the drive device being used to drive the push rod to move within the syringe.
10. The airtightness detection device according to claim 9, characterized in that, the drive device is mounted on the fixing device, the drive device being provided with a connecting portion, one end of the push rod away from the piston being connected to the connecting portion, and the connecting portion being configured to be movable under the drive of the drive device.