An automatic detection device for the puncture strength of lithium battery separators

Abstract

This utility model relates to the field of battery separator testing technology, specifically disclosing an automatic testing device for the puncture strength of battery separators. The device includes a support frame, a testing component, and a clamping component. The testing component is mounted on the support frame and includes a puncture component. The clamping component is located directly below the puncture component and includes a lower clamp and an upper clamp arranged opposite each other. The lower clamp is fixed to the support frame by a connector, and the upper clamp is mounted on the support frame by a drive device. The drive device drives the upper clamp to move up and down, thereby pressing or separating it from the lower clamp. A first puncture hole is provided on the lower clamp, and a second puncture hole is provided on the upper clamp. The device also includes a transmission component for transporting the battery separator. The transmission component includes a transmission part located outside the clamping component, and the transmission part includes a fixing part fixedly connected to the support frame. A roller is rotatably mounted on the fixing part. This utility model achieves automatic testing of the puncture strength of battery separators, improving testing efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of battery separator testing equipment, specifically to an automatic testing device for the puncture strength of lithium battery separators. Background Technology

[0002] With the widespread application of lithium-ion batteries in electronic devices, electric vehicles, and other fields, the lithium battery separator, as one of the key components of the battery, directly affects the safety and lifespan of the battery. The puncture strength of the separator is an important indicator for evaluating its quality; therefore, testing the puncture strength of the separator is particularly important.

[0003] Currently, there are various forms of lithium battery separator puncture strength testing devices. For example, Chinese patent CN203350103U discloses a lithium-ion battery separator puncture strength testing device, which includes a control panel, a puncture component, and a sample carrier component. The control panel can control the puncture component to approach the sample carrier component along the guide rail, so that the puncture needle contacts and generates a contact force on the lithium-ion battery separator until the separator is punctured. The maximum force that punctures the separator is then sensed by the load sensor and fed back to the control panel.

[0004] The diaphragm is still manually placed or removed, and improvements are needed in the automatic transfer, positioning, and clamping of the diaphragm. In particular, the lack of an effective diaphragm transfer mechanism prevents continuous testing and results in low efficiency. This also leads to inconsistent diaphragm puncture distances during testing, affecting the accuracy and consistency of the results.

[0005] Therefore, there is an urgent need for an automatic detection device for battery separator puncture strength that can automatically deliver and securely clamp the separator, in order to improve testing efficiency and accuracy and reduce labor costs. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides an automatic detection device for the puncture strength of a battery separator.

[0007] The specific technical solution is as follows:

[0008] An automatic detection device for the puncture strength of a lithium battery separator includes: a support frame; a detection component mounted on the support frame, the detection component including a puncture component; a clamping component located directly below the puncture component, the clamping component including a lower clamp and an upper clamp disposed opposite to each other, the lower clamp being fixedly connected to the support frame via a connector, the upper clamp being mounted on the support frame via a driving device, the driving device driving the upper clamp to move up and down to achieve pressing or separation with the lower clamp; the lower clamp having a first puncture hole for puncturing the battery separator, the upper clamp having a second puncture hole for puncturing the battery separator; and a transmission component for transporting the battery separator, the transmission component including a transmission part disposed outside the clamping component; the transmission part including a fixing part fixedly connected to the support frame, the fixing part having a roller rotatably mounted on it.

[0009] Preferably, there are two transmission components, which are respectively arranged on the opposite outer sides of the clamping component to facilitate the loading, unloading and transport of the diaphragm sample.

[0010] Preferably, a horizontal guide rod parallel to the roller is rotatably mounted on the fixed part; one end of the roller is connected to a second drive device for driving its rotation; the first drive device and the second drive device are hydraulic cylinders, pneumatic cylinders or electric push rods, used to realize automated control.

[0011] Preferably, the axial height of the roller is higher than the axial height of the horizontal guide rod, which is beneficial for the smooth transport of the diaphragm.

[0012] Preferably, the lower or upper surface of the horizontal guide rod is disposed on the same horizontal plane as the upper surface of the lower clamp to ensure that the diaphragm remains flat during transmission.

[0013] Preferably, the upper clamp includes a clamping part for pressing the battery separator, and both ends of the clamping part are connected to connecting parts. The telescopic end of the first drive device is fixedly connected to the connecting parts, and the fixed end is fixedly connected to the support frame, for controlling the lifting and lowering of the upper clamp.

[0014] Preferably, the puncture assembly is fixed to the support frame by a fixing beam; the puncture assembly includes a connecting cylinder connected to the fixing beam, a puncture needle is telescopically connected to the lower end of the connecting cylinder, and a load sensor for detecting the puncture intensity of the battery separator is installed between the connecting cylinder and the puncture needle.

[0015] Preferably, the second puncture hole and the first puncture hole are coaxially arranged, and the puncture needle is located on the central axis of the second puncture hole and the first puncture hole to ensure the accuracy of the puncture test.

[0016] The beneficial effects of this utility model are as follows:

[0017] This device enables continuous transport of battery separator samples through a transmission assembly, eliminating the tedious steps of individual clamping and replacement required in traditional puncture tests. This effectively improves the testing efficiency for large batches of samples and reduces the burden of manual operation. Furthermore, the lower edge of the horizontal guide rod and the upper surface of the lower clamp are on the same horizontal plane, ensuring that the battery separator remains flat and parallel to the upper surface of the lower clamp throughout the transport process. This avoids uneven stress caused by wrinkles or warping, significantly improving the stability and repeatability of the puncture test.

[0018] This device uses a roll-to-roll continuous transmission method combined with a single fixture structure, resulting in a simple overall structure and a small number of parts. This facilitates equipment debugging and daily maintenance, while also reducing the impact of fixture installation errors on test results.

[0019] Therefore, compared with the existing technology, this utility model can test lithium battery separator puncture at equal intervals, and the uniformity of separator puncture feedback is better; it eliminates the need for manual separator movement testing and data entry, greatly improving the inspection efficiency; the separator puncture test data can be automatically uploaded through the connection of the load sensor to the computer, avoiding the risk of test data entry errors. Attached Figure Description

[0020] Figure 1 This is a front view of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention from the perspective of the upper right corner.

[0022] Figure 3 for Figure 2 Enlarged view of a specific area;

[0023] Figure 4 This is a three-dimensional structural diagram of the present invention from the perspective of the upper left corner.

[0024] In the diagram: 1. Support frame; 2. Fixed beam; 3. Puncture assembly; 31. Connecting cylinder; 32. Load sensor; 33. Puncture needle; 4. Clamping assembly; 41. Lower clamp; 411. Puncture hole one; 42. Connector; 43. Upper clamp; 431. Pressing part; 4311. Puncture hole two; 432. Connecting part; 44. Drive device one; 5. Transmission assembly; 51. Transmission part; 511. Roller; 512. Horizontal guide rod; 52. Fixing part. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] An automatic detection device for the puncture strength of a lithium battery separator includes: a support frame 1; a detection component mounted on the support frame 1, the detection component including a puncture component 3; and a clamping component 4 located directly below the puncture component 3, the clamping component 4 including a lower clamp 41 and an upper clamp 43 disposed opposite to each other, the lower clamp 41 being fixedly connected to the support frame 1 via a connector 42, and the upper clamp 43 being mounted on the support frame 1 via a driving device 44, the driving device 44 driving the upper clamp... 43 performs lifting and lowering movements to achieve pressing or separation with the lower clamp 41; the lower clamp 41 has a puncture hole 411 for puncturing the battery separator, and the upper clamp 43 has a puncture hole 4311 for puncturing the battery separator; transmission assembly 5 is used to transport the battery separator, and the transmission assembly 5 includes a transmission part 51 disposed on the outside of the clamping assembly 4; the transmission part 51 includes a fixing part 52 fixedly connected to the support frame 1, and a roller 511 is rotatably mounted on the fixing part 52.

[0027] The support frame 1 serves as the basic structure of the entire device, providing a stable support platform. Preferably, the support frame 1 is made of metal material, which has sufficient strength and rigidity to withstand various forces and vibrations generated during the testing process. The bottom of the support frame 1 is equipped with an anti-slip pad to ensure that the device will not shift during operation.

[0028] A testing assembly is mounted on a support frame and is used to perform puncture tests on the battery separator and detect its strength. The testing assembly includes a puncture component 3, which is fixed to the support frame 1 by a fixing beam 2. The puncture component 3 includes a connecting cylinder 31 connected to the fixing beam 2, with a puncture needle 33 telescopically connected to the lower end of the connecting cylinder 31. A load sensor 32 for detecting the puncture strength of the battery separator is installed between the connecting cylinder 31 and the puncture needle 33. Preferably, the connecting cylinder 31 is made of hard alloy material, possessing good rigidity and wear resistance; the puncture needle 33 is made of high-hardness material, and its tip is precision-machined to ensure the accuracy and consistency of the puncture process; the load sensor 32 can accurately measure the force change during the puncture process and transmit the data to the control system for recording and analysis.

[0029] The clamping assembly 4 is located directly below the puncture assembly 3 and is used to fix the battery separator to be tested. The clamping assembly 4 includes a lower clamp 41 and an upper clamp 43 arranged opposite to each other. The lower clamp 41 is fixedly connected to the support frame 1 by a connector 42 to ensure its positional stability. The upper clamp 43 is mounted on the support frame 1 by a drive device 44, which drives the upper clamp 43 to move up and down to achieve pressing or separation with the lower clamp 41. The lower clamp 41 has a puncture hole 411 for puncturing the battery separator, and the upper clamp 43 has a puncture hole 4311 for puncturing the battery separator. The puncture hole 411 and the puncture hole 4311 are coaxially arranged, and the puncture needle 33 is located on the central axis of the puncture hole 4311 and the puncture hole 411 to ensure the accuracy of the puncture process. The upper clamp 43 includes a clamping part 431 for pressing the battery separator. Both ends of the clamping part 431 are connected to connecting parts 432. The telescopic end of the drive device 44 is fixedly connected to the connecting parts 432, and the fixed end is fixedly connected to the support frame 1. The drive device 44 can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The appropriate drive method can be selected according to actual needs.

[0030] The transmission assembly 5 is used to transport battery separators. The transmission assembly 5 includes a transmission section 51 disposed on the outside of the clamping assembly 4. The transmission section 51 includes a fixing section 52 fixedly connected to the support frame 1, on which a roller 511 is rotatably mounted. A horizontal guide rod 512, parallel to the roller 511, is also rotatably mounted on the fixing section 52. One end of the roller 511 is connected to a second drive device for driving its rotation; the second drive device can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The axial height of the roller 511 is higher than the axial height of the horizontal guide rod 512, forming a certain height difference to facilitate the transport and tensioning of the battery separator. The lower or upper surface of the horizontal guide rod 512 is disposed on the same horizontal plane as the upper surface of the lower clamp 41, ensuring that the battery separator remains horizontal during transport. Two transmission assemblies 5 are provided, respectively disposed on opposite sides of the clamping assembly; one is used to supply untested battery separators, and the other is used to collect tested battery separators.

[0031] The working process of the automatic battery separator puncture strength detection device in this embodiment is as follows:

[0032] First, the battery separator to be tested is wound onto the roller 511 of one of the drive components 5. Then, the battery separator is guided through the clamping assembly 4 by the horizontal guide rod 512. Finally, the battery separator to be tested is collected onto the roller 511 of another drive component 5 by another horizontal guide rod 512.

[0033] Next, the drive unit 44 drives the upper clamp 43 to move downwards and press against the lower clamp 41, clamping and fixing the battery separator. At this time, the test area of ​​the battery separator is exactly located at the position of puncture hole 411 and puncture hole 4311.

[0034] Then, the puncture needle 33 of the puncture assembly 3 begins to move downward, penetrating the battery separator through puncture hole one 411 until it reaches puncture hole two 4311. During this process, the load sensor 32 monitors and records the changes in puncture force in real time. When the battery separator is penetrated, the force value will change significantly. After connecting with a computer or controller, the data is transmitted in real time, and the puncture intensity of the battery separator is determined based on this change.

[0035] After the test is completed, the puncture needle 33 retracts, and the drive device 1 44 drives the upper clamp 43 to move upward, separating it from the lower clamp 41 and releasing the battery separator. The drive device 2 drives the roller 511 to rotate, transferring the tested battery separator area to the collection roller 511, while simultaneously transferring the new untested area to the position of the clamping assembly 4, ready for the next test.

[0036] Through the above design, the automatic battery separator puncture strength detection device of this embodiment can realize automated and continuous testing of battery separator puncture strength, improve testing efficiency and accuracy, reduce errors from manual operation, and meet the needs of battery separator production and quality control.

[0037] In this embodiment, two transmission components 5 are provided, respectively disposed on opposite sides of the clamping component 4. One transmission component 5 is used to supply untested battery separators, and the other transmission component 5 is used to collect tested battery separators. This arrangement enables continuous transfer of battery separators, achieving automated testing.

[0038] Both transmission components 5 have identical structures, each including a fixed part 52 fixedly connected to a support frame, on which a roller 511 is rotatably mounted. A horizontal guide rod 512, parallel to the roller 511, is also rotatably mounted on the fixed part 52. One end of the roller 511 is connected to a second drive device for rotating it; the second drive device can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The axis height of the roller 511 is higher than the axis height of the horizontal guide rod 512, creating a certain height difference to facilitate the transmission and tensioning of the battery separator. The lower or upper surface of the horizontal guide rod 512 is on the same horizontal plane as the upper surface of the lower clamp 41, ensuring that the battery separator remains horizontal during transmission.

[0039] Two drive components 5 work together: one releases the untested battery separator, and the other collects the tested battery separator. By controlling the rotational speed of the rollers 511 of the two drive components, the transmission speed and tension of the battery separator can be adjusted, ensuring the stability and accuracy of the testing process.

[0040] In this embodiment, the horizontal guide rod 512 is arranged parallel to the roller 511 to guide the transport direction of the battery separator and ensure that the battery separator remains flat during transport. Preferably, the horizontal guide rod 512 is made of a smooth metal material and its surface is polished to reduce friction with the battery separator and avoid damage to the battery separator.

[0041] One end of the roller 511 is connected to a second drive device, which drives the roller to rotate and realize the transfer of the battery separator. The second drive device can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, and the appropriate drive method can be selected according to actual needs. When an electric push rod is selected, the speed and rotation angle of the roller can be precisely controlled by the control system to achieve precise positioning and transfer of the battery separator.

[0042] The drive unit 44 is used to drive the upper clamp 43 to move up and down. It can also be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. When a pneumatic cylinder is selected, the pressure of the upper clamp 43 can be controlled by adjusting the air pressure to ensure that the battery separator is properly clamped, so as not to be damaged by excessive pressure or to slip due to insufficient pressure.

[0043] By rationally selecting the type and parameters of the drive device, the testing requirements of different types of battery separators can be met, thereby improving the adaptability and flexibility of the device.

[0044] The axis height of the roller 511 is higher than that of the horizontal guide rod 512, creating a height difference that causes the battery separator to be tilted during its transfer from the roller 511 to the horizontal guide rod 512. This design helps to tension the battery separator, reduces wrinkles and slack, and ensures the flatness of the test area.

[0045] The height difference can be adjusted according to the type and thickness of the battery separator, and is generally controlled between 5-20 mm. For thinner battery separators, a smaller height difference can be selected to avoid excessive tension that could cause the separator to deform or be damaged; for thicker battery separators, a larger height difference can be selected to ensure sufficient tension to keep the separator flat.

[0046] By adjusting the relative height of the roller 511 and the horizontal guide rod 512, the transmission status of the battery separator can be optimized, thereby improving the accuracy and reliability of the test.

[0047] In this embodiment, the lower or upper surface of the horizontal guide rod 512 is disposed on the same horizontal plane as the upper surface of the lower clamp 41, ensuring that the battery separator remains horizontal when transferred to the clamping assembly 4, thus avoiding deformation or uneven tension of the battery separator due to inconsistent height. Specifically, one transmission assembly 5 may have its lower surface of the horizontal guide rod 512 disposed on the same horizontal plane as the upper surface of the lower clamp 41, while the other transmission assembly 5 may have its upper surface of the horizontal guide rod 512 disposed on the same horizontal plane as the upper surface of the lower clamp 41, thereby forming a clamping state for the battery separator. That is, when the battery separator is transferred from the horizontal guide rod 512 in one transmission assembly 5 to the lower clamp 41 and then to the horizontal guide rod 512 in another transmission assembly 5, the transition is smooth and there is no height difference.

[0048] In this embodiment, the upper clamp 43 includes a clamping part 431 for pressing the battery separator. Both ends of the clamping part 431 are connected to connecting parts 432. The telescopic end of the drive device 44 is fixedly connected to the connecting part 432, and the fixed end is fixedly connected to the support frame 1.

[0049] The clamping part 431 of the upper clamp 43 is used to clamp the battery separator to ensure that the battery separator will not shift or loosen during the test. Preferably, the clamping part 431 is made of a hard material and the surface is treated to have a certain coefficient of friction to enhance the clamping force on the battery separator. The shape of the clamping part 431 matches the lower clamp 41 to ensure that pressure can be applied evenly during pressing and to avoid excessive local pressure that could damage the battery separator.

[0050] Both ends of the clamping part 431 are connected to connecting parts 432, which are fixedly connected to the telescopic end of the drive device 44. This double-connection design ensures that the upper clamp 43 remains horizontal during lifting and lowering, avoiding tilting or displacement. Preferably, the connecting parts 432 are made of metal and have sufficient strength and rigidity to withstand the force applied by the drive device 44.

[0051] The fixed end of the drive unit 44 is fixedly connected to the support frame 1 to ensure the stability of the drive unit 44. The drive unit 44 can be a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, and the appropriate drive method can be selected according to actual needs. When an electric push rod is selected, the position and pressure of the upper clamp 43 can be precisely controlled by the control system to achieve precise clamping of the battery separator.

[0052] By rationally designing the structure and connection method of the upper clamp 43, the stability and reliability of the clamping assembly 4 can be improved, ensuring the fixation effect of the battery separator during the testing process.

[0053] In this embodiment, the puncture assembly 3 is the prior art, which is fixed to the support frame 1 by the fixing beam 2; the puncture assembly 3 includes a connecting cylinder 31 connected to the fixing beam 2, and a puncture needle 33 is telescopically connected to the lower end of the connecting cylinder 31. A load sensor 32 for detecting the puncture intensity of the battery separator is installed between the connecting cylinder 31 and the puncture needle 33.

[0054] The puncture assembly 3 is fixed to the support frame 1 by the fixing beam 2, ensuring the stability of the puncture assembly and preventing displacement or vibration during the test. Preferably, the fixing beam 2 is made of metal material, which has sufficient strength and rigidity to withstand various forces and vibrations generated during the puncture process.

[0055] The puncture assembly 3 includes a connecting cylinder 31 connected to the fixed beam 2. Preferably, the connecting cylinder 31 is made of hard alloy material, which has good rigidity and wear resistance. The connecting cylinder 31 is provided with a guide mechanism to ensure that the puncture needle 33 maintains linear movement during the movement and avoids deviation or shaking.

[0056] A puncture needle 33 is telescopically connected to the lower end of the connecting cylinder 31. Preferably, the puncture needle 33 is made of a high-hardness material, and its tip is precision-machined to ensure the accuracy and consistency of the puncture process. Specifically, the diameter and length of the puncture needle can be adjusted according to testing requirements to adapt to different types of battery separators.

[0057] A load sensor 32 is installed between the connecting cylinder 31 and the puncture needle 33 to detect the puncture intensity of the battery separator. The load sensor 32 can accurately measure the force change during the puncture process and transmit the data to the control system for recording and analysis. Specifically, the range and accuracy of the load sensor 32 are selected according to the characteristics of the battery separator to ensure the accuracy and reliability of the measurement results.

[0058] By rationally designing the structure and connection method of the puncture components, the accuracy and reliability of puncture testing can be improved, and more precise data on the puncture strength of the battery separator can be obtained.

[0059] In this embodiment, puncture hole two 4311 and puncture hole one 411 are coaxially arranged to ensure that the puncture needle 33 can pass smoothly through both holes, avoiding puncture deviation or obstruction caused by misalignment of the holes. Specifically, the diameter of the puncture hole is slightly larger than the diameter of the puncture needle, leaving an appropriate gap to ensure the smooth passage of the puncture needle without affecting the accuracy of the test due to excessive gap. The puncture needle 33 is located on the central axis of puncture hole two 4311 and puncture hole one 411, ensuring the accuracy and consistency of the puncture process. The position of the puncture needle 33 is calibrated by a precision adjustment mechanism to ensure that it is perfectly aligned with the central axis of the puncture hole. This precise alignment design reduces test errors caused by positional deviations and improves the reliability of test results.

[0060] By ensuring the coaxial alignment of the puncture hole and the puncture needle 33, the conditions for puncture testing can be optimized, improving the accuracy and repeatability of the test and obtaining more reliable data on the puncture strength of the battery separator.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic detection device for the puncture strength of a lithium battery separator, characterized in that, include: Support frame (1); A detection component is mounted on the support frame (1), and the detection component includes a puncture component (3). The clamping assembly (4) is located directly below the puncture assembly (3). The clamping assembly (4) includes a lower clamp (41) and an upper clamp (43) arranged opposite to each other. The lower clamp (41) is fixedly connected to the support frame (1) by a connector (42). The upper clamp (43) is mounted on the support frame (1) by a drive device (44). The drive device (44) drives the upper clamp (43) to move up and down to achieve pressing or separation between it and the lower clamp (41). The lower clamp (41) is provided with a puncture hole (411) for puncturing the battery separator, and the upper clamp (43) is provided with a puncture hole (4311) for puncturing the battery separator. The transmission assembly (5) is used to transmit the battery separator. The transmission assembly (5) includes a transmission part (51) disposed outside the clamping assembly (4). The transmission part (51) includes a fixing part (52) fixedly connected to the support frame (1). A roller (511) is rotatably mounted on the fixing part (52).

2. The automatic detection device according to claim 1, characterized in that, Two transmission components (5) are provided, respectively located on opposite sides of the clamping component (4).

3. The automatic detection device according to claim 1, characterized in that, A horizontal guide rod (512) parallel to the roller (511) is also rotatably mounted on the fixed part (52); one end of the roller (511) is connected to a drive device 2 for driving its rotation. The first drive device (44) and the second drive device are hydraulic cylinders, pneumatic cylinders or electric push rods.

4. The automatic detection device according to claim 3, characterized in that, The axis height of the roller (511) is higher than the axis height of the horizontal guide rod (512).

5. The automatic detection device according to claim 3, characterized in that, The lower or upper surface of the horizontal guide rod (512) is disposed on the same horizontal plane as the upper surface of the lower clamp (41).

6. The automatic detection device according to claim 1, characterized in that, The upper clamp (43) includes a clamping part (431) for pressing the battery separator. Both ends of the clamping part (431) are connected to a connecting part (432). The telescopic end of the drive device (44) is fixedly connected to the connecting part (432), and the fixed end is fixedly connected to the support frame (1).

7. The automatic detection device according to claim 1, characterized in that, The puncture assembly (3) is fixed to the support frame (1) by a fixing beam (2); the puncture assembly (3) includes a connecting cylinder (31) connected to the fixing beam (2), and a puncture needle (33) is telescopically connected to the lower end of the connecting cylinder (31). A load sensor (32) for detecting the puncture intensity of the battery separator is installed between the connecting cylinder (31) and the puncture needle (33).

8. The automatic detection device according to claim 7, characterized in that, The second puncture hole (4311) and the first puncture hole (411) are coaxially arranged, and the puncture needle (33) is located on the central axis of the second puncture hole (4311) and the first puncture hole (411).

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