Device for detecting position of pressing cutter of lamination stacking machine
The compression coordinates and compression pressure of the pressing tool are detected by the pressure sensing component, which solves the problem of inaccurate calibration of the vertical position of the lamination machine pressing tool, and accurately corrects the pressing tool and flattens the diaphragm to ensure the quality of the lamination.
Patent Information
- Application Number
- CN202422522948.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-17
AI Technical Summary
In the prior art, the vertical position calibration of the lamination machine press is not accurate enough, resulting in the diaphragm being prone to wrinkles during the lamination process.
Pressure sensing components, especially piezoelectric thin film sensors or multiple pressure sensors, are used to detect the compression coordinates and compression pressure of the pressure knife, and accurately judge the horizontal and vertical position of the pressure knife.
Accurate correction of the position of the pressing tool is achieved, avoiding diaphragm wrinkles, and ensuring the smooth progress of the lamination process.
Smart Images
Figure CN223283790U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery manufacturing, and in particular to a device for detecting the position of a knife press of a laminating machine. Background Art
[0002] During the production of laminated batteries, a laminating machine is used to stack the battery electrodes and separators to form a cell. During this process, four pressing blades on the laminating machine press and position the four corners of the electrode and separator to facilitate folding of the separator. Therefore, the positioning accuracy of the pressing blades is crucial.
[0003] In the related art, when calibrating the position of the press knives, a commonly used method is to use a caliper to measure the distance between the press knives and calibrate them; another commonly used method is to use a calibration jig, which has four positioning slots in the standard position. Position calibration can be achieved by clamping the four press knives in the four positioning slots.
[0004] However, the above method can only calibrate the horizontal position of the four pressing knives well, but the position calibration of the pressing knives in the direction perpendicular to the stacking table is not accurate enough, which may easily cause wrinkles in the diaphragm during the stacking process. Utility Model Content
[0005] In view of this, the present application provides a laminating machine press knife position detection device, which can more accurately detect the press knife position and facilitate the precise calibration of the press knife.
[0006] This application specifically adopts the following technical solutions:
[0007] The embodiment of the present application provides a device for detecting the position of a laminating machine blade, the device comprising a detection body and a pressure sensing component;
[0008] The detection body has a first surface and a second surface opposite to each other, a positioning structure is provided on the first surface, and the detection body is positioned and mounted on the stacking table of the stacking machine through the positioning structure;
[0009] The pressure sensing component is arranged on the second surface of the detection body, and is used to withstand the pressure of the pressing knife of the laminating machine and obtain the pressing coordinates and pressing pressure of the pressing knife.
[0010] Optionally, the pressure sensing component is a piezoelectric film sensor, and the piezoelectric film sensor includes a piezoelectric film;
[0011] When the detection body is mounted on the stacking stage, the orthographic projection of the pressing blade on the second surface is located within the orthographic projection of the piezoelectric film on the second surface.
[0012] Optionally, the pressure sensing component includes a circuit board and a plurality of pressure sensors arranged on the circuit board;
[0013] When the pressure knife presses the pressure sensing component, at least one of the pressure sensors obtains the pressing pressure.
[0014] Optionally, the circuit board has a pressure area and a transmission area;
[0015] One side of the pressure area extends to the overlapping edge of the circuit board, the overlapping edge being the edge of the circuit board that overlaps with the pressing blade, and the plurality of pressure sensors are laid out in the pressure area, wherein when the detection body is mounted on the stacking table, the orthographic projection of the pressing blade on the circuit board is located in the pressure area;
[0016] An electrical connection device is provided in the transmission area, and the electrical connection device is electrically connected to the plurality of pressure sensors.
[0017] Optionally, the device further includes a busbar and a display, wherein the busbar is electrically connected to the pressure sensing component, and the display is electrically connected to the busbar.
[0018] Optionally, two first limiting grooves are spaced apart on the second surface of the detection body, and at least one of the first limiting grooves extends from a side of the other first limiting groove to an edge of the detection body;
[0019] The number of the pressure sensing components is at least two, and at least two of the pressure sensing components are respectively located in the two first limiting grooves, and the position of each of the pressure sensing components corresponds to the position of at least one of the pressure blades.
[0020] Optionally, a second limiting groove is provided on the bottom surface of the first limiting groove, the opening area of the second limiting groove is smaller than the bottom area of the first limiting groove, and at least a portion of the current converging component is accommodated in the second limiting groove;
[0021] Wherein, the bottom surface of the first limiting groove is a surface opposite to the opening of the first limiting groove.
[0022] Optionally, a positioning hole is further provided on the detection body, and the positioning hole passes through the detection body along the thickness direction of the detection body.
[0023] Optionally, a grip portion is protruding from the second surface of the detection body.
[0024] Optionally, the device is a centrosymmetric structure that is symmetrical about the central axis of the detection body, and the extension direction of the central axis of the detection body is parallel to the thickness direction of the detection body.
[0025] The laminating machine press knife position detection device provided in the embodiment of the present application adopts a pressure-sensing component to detect the horizontal position and vertical position of the press knife relative to the stacking table surface. Specifically, after the detection body is installed on the stacking table using the positioning structure, the press knife can be operated to press on the second surface of the detection body. Then the pressure-sensing component obtains the pressing coordinates and pressing pressure of the press knife, and determines the horizontal position of the press knife according to the pressing coordinates, and determines the vertical position of the press knife according to the pressing pressure. Therefore, the laminating machine press knife position detection device described in the embodiment of the present application can accurately detect the horizontal position and vertical position of the press knife, which is conducive to the precise correction of the press knife, and the wrinkles of the diaphragm during the lamination process, ensuring good lamination. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary testers in this field, other drawings can be obtained based on these drawings without creative work.
[0027] Figure 1 This is a schematic diagram of a use scenario of a laminating machine press knife position detection device provided in an embodiment of the present application;
[0028] Figure 2 This is a structural diagram of a laminating machine press knife position detection device provided in an embodiment of the present application;
[0029] Figure 3 This is a schematic structural diagram of another laminating machine press knife position detection device provided in an embodiment of the present application;
[0030] Figure 4 This is a schematic structural diagram of another laminating machine press knife position detection device provided in an embodiment of the present application;
[0031] Figure 5 This is a schematic structural diagram of another laminating machine press knife position detection device provided in an embodiment of the present application;
[0032] Figure 6 This is a schematic structural diagram of another laminating machine press knife position detection device provided in an embodiment of the present application;
[0033] Figure 7 This is a schematic structural diagram of another laminating machine press knife position detection device provided in an embodiment of the present application;
[0034] Figure 8 This is a schematic structural diagram of a first surface of a detection body provided in an embodiment of the present application;
[0035] Figure 9It is a structural schematic diagram of the second surface of a detection body provided in an embodiment of the present application.
[0036] Reference numerals:
[0037] 1. Detection body; 11. First surface; 12. Second surface; 13. Positioning structure; 14. First limiting groove; 141. Bottom surface; 142. Opening; 15. Second limiting groove; 16. Positioning hole; 17. Gripping portion;
[0038] 2. pressure sensing component; 21. piezoelectric film; 22. circuit board; 221. pressure area; 2211. overlapping edge; 222. transmission area; 23. pressure sensor;
[0039] 3. Busbar devices;
[0040] 4. Stacking platforms;
[0041] 5. Press the knife. DETAILED DESCRIPTION
[0042] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary testers in this field without making creative efforts are within the scope of protection of this application.
[0043] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0044] During the production of laminated batteries, a laminating machine is used to stack the battery electrodes and separators to form a battery cell. Specifically, the laminating machine is equipped with a stacking table for the stacking operation. Four pressing blades are located at the four corners of the stacking table. These four pressing blades are used to press and position the separator during each fold, allowing the separator to pass around the pressing blades and form a Z-shaped fold, forming a crease.
[0045] During the operation of the laminating machine, it is necessary to ensure that the press blades are parallel to each other to ensure consistent diaphragm tension when the press blades are withdrawn, ensuring good lamination. In the related art, a common method for calibrating the press blade positions is to use calipers to measure the horizontal and vertical distances between the press blades. However, this measurement and calibration method relies too much on the experience of the tester, and the calibration standard is too subjective, resulting in inaccurate calibration results. Furthermore, the caliper is inconvenient to operate when measuring the vertical distance between the press blades, which can easily lead to increased measurement errors. Another common method is to use a calibration jig. The calibration jig has four positioning slots in standard positions. After positioning the calibration jig on the laminating machine, the four press blades can be respectively fixed in the four positioning slots to achieve position calibration. However, using this calibration jig, on the one hand, the press blades may be damaged when they are stuck in the positioning slots, and on the other hand, the positioning slots can only calibrate the horizontal position of the four press blades, but only roughly calibrate the vertical position of the press blades. The deviation between the press blades and the stacking table cannot be determined, making adjustment inconvenient.
[0046] In order to solve the problems existing in the press knife calibration fixture in the related art, the embodiment of the present application provides a press knife position detection device for a laminating machine. Figure 1 The figure shows the usage scenario of the device, that is, the cooperation mode of the device with the stacking table 4 and the pressing knife 5.
[0047] like Figure 1 As shown, the stacking machine press knife position detection device includes a detection body 1 and a pressure sensing component 2; the detection body 1 has a first surface 11 and a second surface 12 relative to each other, and a positioning structure 13 is provided on the first surface 11. The detection body 1 is positioned and installed on the stacking table 4 of the stacking machine through the positioning structure 13; the pressure sensing component 2 is arranged on the second surface 12 of the detection body 1, and the pressure sensing component 2 is used to withstand the pressure of the stacking machine's press knife 5 and obtain the pressure coordinates and pressure pressure of the press knife 5.
[0048] The laminating machine press knife position detection device described in this embodiment uses a pressure sensing component 2 to detect the horizontal position and vertical position of the press knife 5 relative to the table surface of the stacking platform 4. Specifically, after the detection body 1 is installed on the stacking platform 4 using the positioning structure 13, the press knife 5 can be operated to press on the second surface 12 of the detection body 1. Then the pressure sensing component 2 obtains the pressing coordinates and pressing pressure of the press knife 5, and determines the horizontal position of the press knife 5 according to the pressing coordinates, and determines the vertical position of the press knife 5 according to the pressing pressure. Therefore, the laminating machine press knife position detection device described in the embodiment of the present application can accurately detect the horizontal position and vertical position of the press knife 5, which is conducive to achieving accurate correction of the press knife 5, and preventing wrinkles in the diaphragm during the lamination process, thereby ensuring good lamination.
[0049] It should be noted that, in the embodiment of the present application, the horizontal direction refers to the direction parallel to the table surface of the stacking platform 4 , and the vertical direction refers to the direction perpendicular to the table surface of the stacking platform 4 .
[0050] In some embodiments of the present application, Figure 1 As shown, the pressure sensing component 2 can be a piezoelectric film sensor, which includes a piezoelectric film 21. When the detection body 1 is mounted on the stacking stage 4, the orthographic projection of the pressure blade 5 on the second surface 12 of the detection body 1 is located within the orthographic projection of the piezoelectric film 21 on the second surface 12.
[0051] A piezoelectric film sensor is a sensor that works based on the piezoelectric effect, and the main functional component used to make the sensor is a piezoelectric film 21. When the piezoelectric film 21 is subjected to mechanical stress, an electric charge will be generated on its surface, and the change in surface charge can be detected and converted into an electrical signal, thereby accurately sensing pressure. In the embodiment of the present application, by using a piezoelectric film sensor, when the pressure knife 5 is pressed onto the piezoelectric film 21, the coordinates of the pressure area caused by the pressure knife 5 and the pressure value of each coordinate point can be obtained based on the charge change on the surface of the piezoelectric film 21. By comparing the pressure coordinates corresponding to each of the four pressure knives 5, the horizontal distance between adjacent pressure knives 5 can be calculated, and then the horizontal position of the four pressure knives 5 can be obtained, and finally it can be determined whether the horizontal position of the four pressure knives 5 meets the design requirements. By comparing whether the pressure values of each coordinate point in the pressure area of a pressure knife 5 are consistent, it can be determined whether the blade surface of the pressure knife 5 is horizontal, thereby avoiding the situation where the pressure knife 5 is tilted and the diaphragm is subjected to uneven force. By comparing the pressure values at each coordinate point within the pressing area of the four pressing knives 5, it can be determined whether the four pressing knives 5 are at the same height in the vertical direction, and further whether the four pressing knives 5 have the same vertical position. After obtaining the horizontal position, vertical position and blade inclination of each pressing knife 5, the inspection personnel can accurately calibrate the position of each pressing knife 5 based on this.
[0052] By making the orthographic projection of the pressing blade 5 on the second surface 12 of the detection body 1 be located within the orthographic projection of the piezoelectric film 21 on the second surface 12 after the detection body 1 is installed on the stacking stage 4, it is possible to ensure that the pressing area of each pressing blade 5 falls exactly within the range that can be pressure-sensed, thereby ensuring the reliability and accuracy of pressure sensing.
[0053] Optionally, two of the four pressing blades 5 located on the same side can share the same piezoelectric film 21, such as Figure 2 In this way, the difficulty of arranging the piezoelectric film 21 can be reduced and the circuit layout can be simplified.
[0054] Optional, such as Figure 3As shown, the four pressing blades 5 can each correspond to one piezoelectric film 21. This can save the material of the piezoelectric film 21 and reduce the cost.
[0055] In other embodiments of the present application, Figure 4 As shown, the pressure sensing component 2 includes a circuit board 22 and a plurality of pressure sensors 23 provided on the circuit board 22. When the pressure blade 5 presses the pressure sensing component 2, at least one pressure sensor 23 obtains the pressing pressure.
[0056] A plurality of pressure sensors 23 are arranged in an array within the target area, and each pressure sensor 23 corresponds to a position coordinate. The orthographic projection of the target area on the surface of the stacking platform 4 coincides with the surface of the stacking platform 4. When the four pressing knives 5 press on the pressure sensing component 2, at least a portion of the pressure sensors 23 will sense the pressure of the pressing knives 5, and then these pressure sensors 23 will output the sensed pressure values. By identifying the position coordinates of the pressure sensors 23 that output these pressure values, the inspection personnel can determine the corresponding pressing areas of the four pressing knives 5. By comparing the corresponding position coordinates of the four pressing knives 5, the horizontal distance between adjacent pressing knives 5 can be calculated, and then the horizontal position of the four pressing knives 5 can be obtained, and finally it can be determined whether the horizontal position of the four pressing knives 5 meets the design requirements. By comparing the pressure values of the various position coordinate points within the pressing area of a pressing knife 5 to see if they are consistent, it can be determined whether the blade surface of the pressing knife 5 is horizontal, thereby avoiding the situation where the pressing knife 5 is tilted and the diaphragm is subjected to uneven force. By comparing the pressure values at the coordinate points within the pressing area of the four pressing knives 5, it can be determined whether the four pressing knives 5 are at the same height in the vertical direction, and further whether the four pressing knives 5 have the same vertical position. After obtaining the horizontal position, vertical position and blade inclination of each pressing knife 5, the inspection personnel can accurately calibrate the position of each pressing knife 5 based on this.
[0057] Optionally, the circuit board 22 is a thin-film circuit board. Compared with other types of circuit boards, thin-film circuit boards have higher density, better electrical performance and smaller volume, which can ensure more accurate and reliable pressure sensing.
[0058] like Figure 4As shown, the circuit board 22 has a pressure region 221 and a transmission region 222. One side of the pressure region 221 extends to the overlapping edge 2211 of the circuit board 22, which is the edge of the circuit board 22 that overlaps the pressing blade 5. The pressure region 221 is provided with the aforementioned multiple pressure sensors 23, illustratively arranged in an array. When the detection body 1 is mounted on the stacking platform 4, the orthographic projection of the pressing blade 5 on the circuit board 22 is located within the pressure region 221, allowing the multiple pressure sensors 23 therein to sense the pressing coordinates and pressure of the pressing blade 5. The transmission region 222 is the area of the circuit board 22 outside the pressure region 221. An electrical connector (not shown) is provided within the transmission region 222. The electrical connector is electrically connected to the multiple pressure sensors 23 and is used to output the pressure signals sensed by the multiple pressure sensors 23 to other devices, such as a control device, a data processing device, a display device, etc.
[0059] In some embodiments of the present application, Figure 5 As shown, the laminating machine press blade position detection device also includes a busbar device 3 and a display (not shown). The busbar device 3 is electrically connected to the pressure sensing component 2, for example, to a piezoelectric film sensor, or to multiple pressure sensors 23. The busbar device 3 is used to organize and transmit the pressure coordinates and pressures obtained by the pressure sensing component 2. The display is electrically connected to the busbar device 3 and displays the obtained pressure coordinates and the pressures corresponding to each pressure coordinate.
[0060] See also Figure 6 In some embodiments, two first limiting grooves 14 are spaced apart on the second surface 12 of the detection body 1, and at least one first limiting groove 14 extends to the edge of the detection body 1 away from the side of the other first limiting groove 14; the number of pressure sensing components 2 is at least two, and at least two pressure sensing components 2 are respectively located in the two first limiting grooves 14, and the position of each pressure sensing component 2 corresponds to the position of at least one pressure knife 5.
[0061] The first limiting groove 14 opens in a direction away from the first surface 11. The pressure sensing assembly 2 is accommodated within the first limiting groove 14, facilitating installation and positioning of the pressure sensing assembly 2. Furthermore, the provision of the first limiting groove 14 reduces the weight of the detection body 1, preventing damage to the stacking platform 4 under heavy pressure. Furthermore, when positioning two pressing blades 5 on the same side, the first limiting groove 14 provides a rough positioning function. If both pressing blades 5 cannot be simultaneously placed within the first limiting groove 14, it indicates that the horizontal distance between the two pressing blades 5 is too large.
[0062] In some embodiments of the present application, Figure 7As shown, the bottom surface 141 of the first limiting groove 14 is further provided with a second limiting groove 15. The opening direction of the second limiting groove 15 is the same as the opening direction of the first limiting groove 14, and the opening area of the second limiting groove 15 is smaller than the bottom area of the first limiting groove 14. The bottom surface 141 of the first limiting groove 14 is opposite to the opening 142 of the first limiting groove 14. By providing the second limiting groove 15, the deadweight of the detection body 1 can be further reduced. Generally speaking, the second limiting groove 15 is provided between two pressure blades 5 or two pressure sensing components 2 located on the same side.
[0063] At least a portion of the confluence device 3 is accommodated in the second limiting groove 15, which can facilitate the installation of the confluence device 3, while reducing the installation and layout space occupied above the detection body 1, and can also facilitate the connection of the pressure sensing components 2 on both sides.
[0064] In some embodiments of the present application, the positioning structure 13 on the first surface 11 of the detection body 1 can be a positioning groove, the shape of which matches the contour shape of the stacking platform 4, so that the stacking platform 4 can be stuck in the positioning groove to achieve installation positioning.
[0065] Optional, such as Figure 8-9 As shown, the detection body 1 may also be provided with at least one positioning hole 16. This at least one positioning hole 16 extends through the detection body 1 along its direction, i.e., the positioning hole 16 is a through hole. Accordingly, the top of the stacking table 4 is provided with at least one positioning mark. When installing the detection body 1, the position of the positioning hole 16 can be aligned with the position of the positioning mark. For example, the positioning mark can be exposed from the positioning hole 16, thereby enhancing positioning and preventing errors. Alternatively, the positioning mark can be a positioning pattern or other positioning feature.
[0066] In some embodiments, a grip portion 17 is protruded from the second surface 12 of the detection body 1 . The grip portion 17 is used for the detection personnel to hold it, thereby facilitating the installation and removal of the detection body 1 on the stacking platform 4 .
[0067] For example, Figure 9 As shown, the grip portion 17 is provided in the middle of the second surface 12, and a positioning hole 16 is provided on opposite sides of the second surface 12. The grip portion 17 is a long strip-shaped protrusion, and the inspection personnel can grab the grip portion 17 for operation when installing and disassembling the inspection body 1.
[0068] Optional, such as Figure 9 As shown, the laminating machine press knife position detection device provided in the embodiment of the present application can be a centrally symmetrical structure symmetrical about the central axis of the detection body 1, wherein the extension direction of the central axis of the detection body 1 is parallel to the thickness direction of the detection body 1.
[0069] It should be noted that, in the embodiments of the present application, a centrally symmetrical structure refers to a structure that coincides with the original structure shape after being rotated 180 degrees around the central axis. For example, Figure 9 The dotted line in the figure shows the central axis of the laminating machine press knife position detection device. By designing the device as a central symmetrical structure, the installation difficulty of the device is reduced, which is conducive to improving the installation efficiency and the press knife position detection efficiency.
[0070] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.
[0071] The above description is only for the purpose of facilitating the understanding of the technical solution of this application by testers in this field and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.
Claims
1. A laminating machine knife position detection device, characterized in that: The device comprises a detection body (1) and a pressure sensing component (2); The detection body (1) has a first surface (11) and a second surface (12) facing each other, a positioning structure (13) is provided on the first surface (11), and the detection body (1) is positioned and mounted on the stacking table (4) of the stacking machine via the positioning structure (13); The pressure sensing component (2) is arranged on the second surface (12) of the detection body (1), and the pressure sensing component (2) is used to withstand the pressure of the pressing knife (5) of the laminating machine and obtain the pressing coordinates and pressing pressure of the pressing knife (5).
2. The device according to claim 1, characterized in that The pressure sensing component (2) is a piezoelectric film sensor, and the piezoelectric film sensor includes a piezoelectric film (21); When the detection body (1) is mounted on the stacking platform (4), the orthographic projection of the pressing blade (5) on the second surface (12) is located within the orthographic projection of the piezoelectric film (21) on the second surface (12).
3. The device according to claim 1, characterized in that The pressure sensing component (2) comprises a circuit board (22) and a plurality of pressure sensors (23) arranged on the circuit board (22); When the pressure blade (5) presses the pressure sensing component (2), at least one of the pressure sensors (23) acquires the pressing pressure.
4. The device according to claim 3, characterized in that The circuit board (22) has a pressure area (221) and a transmission area (222); One side of the pressure area (221) extends to the overlapping edge (2211) of the circuit board (22), the overlapping edge (2211) being the edge of the circuit board (22) that overlaps with the pressing knife (5), and the plurality of pressure sensors (23) are arranged in the pressure area (221), wherein when the detection body (1) is mounted on the stacking table (4), the positive projection of the pressing knife (5) on the circuit board (22) is located in the pressure area (221); An electrical connection device is provided in the transmission area (222), and the electrical connection device is electrically connected to the plurality of pressure sensors (23).
5. The device according to any one of claims 1 to 4, characterized in that: The device further comprises a busbar component (3) and a display, wherein the busbar component (3) is electrically connected to the pressure sensing component (2), and the display is electrically connected to the busbar component (3).
6. The device according to claim 5, characterized in that Two first limiting grooves (14) are arranged on the second surface (12) of the detection body (1) at intervals, and at least one of the first limiting grooves (14) extends from a side of the other first limiting groove (14) to an edge of the detection body (1); The number of the pressure sensing components (2) is at least two, and at least two of the pressure sensing components (2) are respectively located in the two first limiting grooves (14), and the position of each of the pressure sensing components (2) corresponds to the position of at least one of the pressure blades (5).
7. The device according to claim 6, characterized in that A second limiting groove (15) is provided on the bottom surface (141) of the first limiting groove (14); the opening area of the second limiting groove (15) is smaller than the bottom area of the first limiting groove (14); at least a portion of the converging device (3) is accommodated in the second limiting groove (15); The bottom surface (141) of the first limiting groove (14) is a surface opposite to the opening (142) of the first limiting groove (14).
8. The device according to claim 1, characterized in that A positioning hole (16) is also provided on the detection body (1), and the positioning hole (16) passes through the detection body (1) along the thickness direction of the detection body (1).
9. The device according to claim 1, characterized in that A gripping portion (17) is convexly provided on the second surface (12) of the detection body (1).
10. The device according to claim 1, characterized in that The device is a centrosymmetrical structure that is symmetrical about the central axis of the detection body (1), and the extension direction of the central axis of the detection body (1) is parallel to the thickness direction of the detection body (1).