Positioning device for welding cylindrical battery cap

Abstract

The utility model provides a kind of positioning device for cylindrical battery cap welding, including base, rotating mechanism, feeding mechanism and several positioning mechanisms, rotating mechanism is set on base, and rotating mechanism has several battery postions, and battery postion is loaded with the battery to be welded;Feeding mechanism is oppositely set in the side of rotating mechanism, and it is set corresponding with the position of each battery postion, for feeding cap;Several positioning mechanisms are all set on rotating mechanism, and it is set corresponding with the position of each battery postion and feeding mechanism, for clamping and positioning after the cap of feeding;Rotating mechanism drives battery postion and positioning mechanism to be welded side circumferentially synchronous rotation, for welding and fixing the tab of cap and battery to be welded;The device can effectively fix cap before welding, ensure the accuracy of cap and tab welding position, improve cylindrical battery production quality, make cap and tab welding continuous operation, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery cell production technology, and in particular to a positioning device for welding the cap of a cylindrical battery. Background Technology

[0002] Lithium batteries, as an indispensable energy source in the world today, have outstanding advantages such as light weight and portability, and are used in various fields of society. However, in the manufacturing process of cylindrical batteries, it is necessary to fix the cap of the cylindrical battery and then weld it to the electrode tab.

[0003] A novel cylindrical lithium-ion battery cap welding and positioning device, disclosed in CN209150171U, includes a body, a welding head, a cap positioning component, a gasket, a cap, a positive electrode tab, and a threaded hole. The body contains an ultrasonic generator, a transducer, and an amplitude transformer. A base plate extends from one side of the body, and the gasket is placed on the base plate. The cap positioning component is placed on the gasket, and the three components are connected together by screws in the threaded hole. The cap positioning component is an integral stepped columnar structure, including a first stepped column, a second stepped column, a third stepped column, and a bottom mold. The two sides of the first stepped column are L-shaped, and the L-shaped base plate has a threaded hole. The upper end face of the bottom mold has a groove, and a round hole is left in the middle for placing the cap. The positive electrode tab is placed on the cap.

[0004] Existing cap fixing mechanisms suffer from poor fixing effect and are prone to loosening and falling off. For small cylindrical lithium-ion batteries, if the cap falls off or becomes loose and shifted, it will lead to offset soldering or invalid welding, resulting in scrapped cells, reducing battery production quality and yield. Furthermore, the welding process between the cap and the tab cannot be achieved in continuous production, thus reducing production efficiency. Utility Model Content

[0005] In view of this, the present invention proposes a positioning device for welding cylindrical battery caps, which can effectively fix the caps before welding and prevent them from loosening and falling off, ensuring the accuracy of the welding position between the caps and the tabs, thereby improving the production quality of cylindrical lithium-ion batteries, and enabling continuous welding of the caps and tabs, thus improving production efficiency.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a positioning device for welding cylindrical battery caps, including a base, a rotating mechanism, a feeding mechanism, and several positioning mechanisms, wherein... The rotating mechanism is mounted on the base and has several battery cell stations, on which battery cells to be welded are loaded. The feeding mechanism is positioned on one side of the rotating mechanism and corresponds to the position of each battery cell station, and is used to feed the caps. Several positioning mechanisms are set on the rotating mechanism and are set in accordance with the positions of each battery cell station and the feeding mechanism, and are used to clamp and position the caps after feeding. The rotating mechanism drives the cell station and positioning mechanism to rotate synchronously in the circumferential direction toward the welding side, and welds and fixes the cap to the electrode tab of the cell to be welded.

[0007] Based on the above technical solutions, preferably, the rotating mechanism includes a driving component, a rotating cylinder, several connecting components, and a mounting base, wherein, The drive unit is fixed inside the base, and the output shaft of the drive unit passes through and extends to the outside of the base; The rotating drum is fixed to the output shaft of the drive unit; Several connecting parts are fixed on the outside of the rotating drum and are evenly distributed around the center point of the rotating drum; Several mounting bases are fixed on corresponding connectors, and the battery cells to be welded are loaded on the mounting bases, which serve as battery cell stations for the rotating mechanism.

[0008] Based on the above technical solutions, preferably, the mounting base is provided with a positioning groove that matches the cross-section of the battery cell to be welded, and the inner wall of the positioning groove is provided with a protective layer. The battery cell to be welded is inserted into the positioning groove and abuts against the surface of the protective layer.

[0009] Based on the above technical solutions, preferably, each positioning mechanism includes a base, a disk, and an adsorption body, wherein, The base is vertically fixed to the outside of the rotating cylinder and located directly above the mounting base; The disc is fixed to the end of the base away from the rotating cylinder, and the diameter of the disc is smaller than the inner diameter of the cap; The adsorbent is fixed on the disc and located at the center of the disc. It is used to adsorb and fix the cap that has been loaded into place. The adsorbent serves as the adsorption end of the positioning mechanism.

[0010] Based on the above technical solutions, preferably, it also includes several snap-fit ​​components, which are disposed on each disc body. Each snap-fit ​​component has an elastic end, which can elastically extend and retract in the radial direction of the disc body. The adsorption body adsorbs and fixes the cap, so that the elastic end moves laterally and abuts against the inner wall of the cap, locking the current position of the cap.

[0011] Based on the above technical solutions, preferably, the number of snap-fit ​​components provided on each disk is multiple, and the multiple snap-fit ​​components are distributed in a uniform array around the center point of the disk.

[0012] Based on the above technical solutions, preferably, the snap-fit ​​assembly includes a spring, a slider, a guide rod, and a guide cylinder, wherein, One end of the spring is fixed to the outside of the adsorbent, and the other end is fixedly connected to the slider. The end of the slider away from the spring is hemispherical. The guide tube is fixed to the outside of the adsorption body and located inside the spring; The guide rod is slidably connected inside the guide cylinder, and the other end of the guide rod is fixedly connected to the slider.

[0013] Based on the above technical solutions, preferably, it also includes a positioning detection component, which is fixed on the disc body and coincides with the axis of the disc body, and is located inside the adsorption body, for detecting the relative position of the cap.

[0014] Based on the above technical solutions, preferably, the adsorbent is an electromagnet.

[0015] Based on the above technical solutions, preferably, the feeding mechanism includes a guide member, the inner side of which is provided with a cavity, and the guide member is provided with a discharge port that communicates with the cavity. The discharge port and the disc are arranged at a relative interval. The cap abuts against the inner wall of the cavity and moves toward the discharge port. The adsorbent body adsorbs and fixes the cap of the discharge port.

[0016] The positioning device for welding cylindrical battery caps of this utility model has the following advantages over the prior art: (1) By setting up a rotating mechanism, a feeding mechanism and several positioning mechanisms, the cap and electrode welding can be carried out continuously, reducing the waiting time and idle time in the production process, improving production efficiency. In addition, the positioning mechanism can effectively fix the cap above the cell to be welded and fit it tightly with the electrode, keeping it from loosening and falling off, ensuring the accuracy of the welding position of the cap and electrode, thereby improving the production quality of cylindrical lithium-ion batteries. (2) The snap-fit ​​assembly can cause elastic displacement during the cap adsorption and fixation, and the elastic end abuts against the inner wall of the cap, locking the cap in the current position, preventing the cap from shifting or falling off due to vibration, centrifugal force and other factors during subsequent rotation or welding, thereby improving welding accuracy and product quality. (3) By setting multiple snap-fit ​​components in a uniform array around the center point of the disc, the constraint force on the cap in all directions is more balanced, avoiding the cap from tilting or shifting due to uneven force, thus effectively fixing the cap. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the positioning device for welding cylindrical battery caps according to the present invention. Figure 2 A perspective view of the rotating mechanism of the positioning device for welding cylindrical battery caps according to this utility model; Figure 3 This is a front sectional view of the rotating mechanism of the positioning device for welding cylindrical battery caps according to this utility model. Figure 4 This is a side view of the positioning mechanism of the positioning device for welding cylindrical battery caps according to this utility model; Figure 5 This is a cross-sectional view of the guide component of the positioning device for welding cylindrical battery caps according to this utility model. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] like Figure 1-5 As shown, this utility model discloses a positioning device for welding cylindrical battery caps, comprising a base 1, a rotating mechanism 2, a feeding mechanism 3, and several positioning mechanisms 4. The rotating mechanism 2 is mounted on the base 1 and has several cell stations, on which cells to be welded are loaded. The feeding mechanism 3 is positioned opposite to one side of the rotating mechanism 2 and corresponds to the position of each cell station, for feeding the cap. Several positioning mechanisms 4 are mounted on the rotating mechanism 2 and correspond to the positions of each cell station and the feeding mechanism 3, for clamping and positioning the cap after feeding. The rotating mechanism 2 drives the cell stations and positioning mechanisms 4 to rotate synchronously circumferentially toward the welding side, thereby welding and fixing the cap to the tabs of the cells to be welded.

[0021] It should be noted that the cap is conveyed to the position relative to the positioning mechanism 4 by the feeding mechanism 3. Several positioning mechanisms 4 rotate with the rotating mechanism 2. When the position corresponds to the feeding mechanism 3, the positioning mechanism 4 clamps and positions the cap after feeding. Then, the battery cells to be welded are loaded onto the various battery cell stations of the rotating mechanism 2. At this time, the cap is located above the battery cell to be welded and is in contact with the electrode tab of the battery cell to be welded. The rotating mechanism 2 drives the cap and the battery cell to be welded to rotate synchronously toward the welding side. When rotating to the welding station, the external welding gun welds the cap and the electrode tab of the battery cell to be welded. After welding, it continues to rotate to the unloading station for unloading. After completing one welding, the rotating mechanism 2 continues to rotate, rotating the next station loaded with the battery cell to be welded and whose cap has been positioned to the welding position. At the same time, the feeding mechanism 3 continues to feed caps to the subsequent stations, and the positioning mechanism 4 also continues to position the newly fed caps. This cycle is repeated to achieve continuous cap welding operation.

[0022] The positioning mechanism 4 effectively fixes the cap above the cell to be welded and fits tightly with the tab, preventing it from loosening or falling off. This ensures the accuracy of the welding position between the cap and the tab, thereby improving the production quality of cylindrical lithium-ion batteries. Furthermore, the entire device achieves automated continuous operation of cap loading, positioning, welding, and unloading, allowing multiple workstations to perform different operations simultaneously. This reduces waiting and idle time during the production process, thereby improving production efficiency.

[0023] The rotating mechanism 2 in this embodiment includes a driving member 21, a rotating cylinder 22, several connecting members 23, and a mounting base 24. The driving member 21 is fixed inside the base 1, and the output shaft of the driving member 21 passes through and extends to the outside of the base 1. The rotating cylinder 22 is fixed on the output shaft of the driving member 21. Several connecting members 23 are all fixed on the outside of the rotating cylinder 22 and are evenly distributed around the center point of the rotating cylinder 22. Several mounting bases 24 are respectively fixed on the corresponding connecting members 23. The battery cell to be welded is loaded on the mounting base 24 and used as the battery cell station of the rotating mechanism 2.

[0024] It should be noted that when the positioning device for welding the cylindrical battery cap starts working, the drive component 21 located in the cavity of the base 1 starts to operate after receiving the start signal from the control system. The drive component 21 provides power for the rotation of the motor to the rotating mechanism 2. The drive component 21 drives the several connecting parts 23 connected to the rotating drum 22 to rotate, which in turn drives the mounting base 24 loaded with the battery cell to be welded to rotate. This can drive the battery cell to be welded to move towards the cap feeding end and the welding station, thereby improving production efficiency.

[0025] In this embodiment, the mounting base 24 is provided with a positioning groove 240 that matches the cross-section of the battery cell to be welded, and the inner wall of the positioning groove 240 is provided with a protective layer 25. The battery cell to be welded is inserted into the positioning groove 240 and abuts against the surface of the protective layer 25.

[0026] It should be noted that the matching design of the positioning groove 240 with the cross-section of the battery cell to be welded makes the positioning of the battery cell on the mounting base 24 more accurate and stable, greatly reducing the positional deviation of the battery cell during rotation. This ensures that the cap can accurately fit with the battery cell tab during subsequent loading and positioning, thereby improving the welding precision and quality, reducing the incidence of welding defects. At the same time, the protective layer 25 provides all-round protection for the battery cell, preventing the surface of the battery cell from being scratched, worn or deformed by collision, ensuring the quality and safety of the battery cell, and extending the service life of the battery cell.

[0027] Each positioning mechanism 4 in this embodiment includes a base 41, a disc 42, and an adsorption body 43. The base 41 is vertically fixed to the outside of the rotating cylinder 22 and is located directly above the mounting base 24. The disc 42 is fixed to the end of the base 41 away from the rotating cylinder 22, and the diameter of the disc 42 is smaller than the inner diameter of the cap. The adsorption body 43 is fixed on the disc 42 and is located at the center of the disc 42. It is used to adsorb and fix the cap that has been loaded into place. The adsorption body 43 serves as the adsorption end of the positioning mechanism 4.

[0028] Specifically, in this embodiment, the adsorbent 43 is an electromagnet.

[0029] It should be noted that since the base 41 is vertically fixed on the outside of the rotating drum 22, when the driving component 21 in the rotating mechanism 2 drives the rotating drum 22 to rotate, each positioning mechanism 4 will move in a circle around the central axis of the rotating drum 22 together with the rotating drum 22. The base 41 is located directly above the mounting base 24, so that the positioning mechanism 4 and the welding core on the mounting base 24 correspond in the vertical direction, which facilitates the subsequent positioning operation of the cap. When the feeding component 3 transports the cap to the position relative to the disc 42, the rotating mechanism 2 stops, the adsorption body 43 is powered on, and the cap is magnetically adsorbed and fixed by the adsorption body 43.

[0030] This embodiment also includes several snap-fit ​​components 5, which are disposed on each disc body 42. Each snap-fit ​​component 5 has an elastic end, which can elastically extend and retract in the radial direction of the disc body 42. The adsorption body 43 adsorbs and fixes the cap, so that the elastic end moves laterally and abuts against the inner wall of the cap, locking the current position of the cap.

[0031] It should be noted that after the cap is fed into place by the feeding mechanism 3, the adsorbent 43 starts to work, generating a magnetic field to attract the cap. Under the action of the magnetic field, the cap moves closer to the adsorbent 43 at the center of the disc 42 and gradually adheres to it. As the cap is attracted by the adsorbent 43 and moves towards the disc 42, the inner wall of the cap will contact the elastic end of the snap-fit ​​component 5. Due to the movement of the cap, a radial inward pressure is applied to the elastic end. According to the elastic characteristics of the elastic end, it will elastically expand and contract towards the center of the disc 42 under the action of this pressure. At the same time, the elastic end will generate a reverse elastic force, so that the elastic end is tightly pressed against the inner wall of the cap, thereby locking the cap in the current position and preventing the cap from shifting or falling off due to vibration, centrifugal force or other factors during subsequent rotation or welding.

[0032] Specifically, each disk 42 is provided with multiple snap-fit ​​components 5, and the multiple snap-fit ​​components 5 are distributed in a uniform array around the center point of the disk 42.

[0033] It should be noted that when multiple snap-fit ​​components 5 are evenly distributed around the center point of the disc body 42, after the elastic end of each snap-fit ​​component 5 contacts the inner wall of the cap, it will apply a radial elastic force to the cap. Due to the uniform distribution, the resultant force of multiple elastic forces in the horizontal plane can be balanced with each other, so that the constraint force on the cap in all directions is more balanced, avoiding the cap from tilting or shifting due to uneven force, and thus effectively fixing the cap.

[0034] The snap-fit ​​assembly 5 in this embodiment includes a spring 51, a slider 52, a guide rod 53, and a guide cylinder 54. One end of the spring 51 is fixed to the outside of the adsorption body 43, and the other end is fixedly connected to the slider 52. The end of the slider 52 away from the spring 51 is hemispherical. The guide cylinder 54 is fixed to the outside of the adsorption body 43 and located inside the spring 51. The guide rod 53 is slidably connected inside the guide cylinder 54, and the other end of the guide rod 53 is fixedly connected to the slider 52.

[0035] It should be noted that when the adsorbent 43 adsorbs the cap and brings it close, the inner wall of the cap squeezes the hemispherical end of the slider 52. Since the slider 52 is connected to the guide rod 53, and the guide rod 53 slides inside the guide cylinder 54, the slider 52 will move along the axial direction of the guide cylinder 54 towards the adsorbent 43. At the same time, the spring 51 is compressed, and the spring 51 generates a reverse elastic force. As the cap continues to approach, the elastic force of the spring 51 makes the slider 52 press tightly against the inner wall of the cap, thus locking the cap. The guide cylinder 54 and the guide rod 53 ensure the accuracy of the radial movement of the slider 52 and prevent deviation. The hemispherical end can reduce friction with the inner wall of the cap, making the contact smoother. The elastic force provided by the spring 51 can adapt to caps of different sizes and ensure locking stability, effectively preventing the cap from shifting or falling off during rotation and welding, improving welding accuracy and product quality.

[0036] This embodiment also includes a positioning detection component 6, which is fixed on the disc body 42 and coincides with the axis of the disc body 42, and is located inside the adsorption body 43, for detecting the relative position of the cap.

[0037] It should be noted that the positioning detection component 6 is used to obtain the coordinate information of the cap relative to itself in real time. When the detection is corresponding to the position of the cap, a command is sent to the controller to drive the rotating mechanism 2 to stop rotating, so that the adsorption body 43 is powered on to adsorb and fix the cap. This effectively avoids welding defects caused by the position deviation of the cap and ensures efficient and stable production.

[0038] The feeding mechanism 3 in this embodiment includes a guide 31. A cavity 310 is provided on the inner side of the guide 31, and a discharge port 320 communicating with the cavity 310 is provided on the guide 31. The discharge port 320 is arranged at a relative interval with the disc 42. The cap abuts against the inner wall of the cavity 310 and moves toward the discharge port 320. The adsorbent 43 adsorbs and fixes the cap of the discharge port 320.

[0039] It should be noted that the guide 31 is inclined, and since the cap abuts against the inner wall of the cavity 310, the cap will move orderly along the inner wall of the cavity 310 toward the discharge port 320 under gravity. When a cap arrives at the discharge port 320, since the discharge port 320 and the disc 42 are relatively spaced apart, the adsorption body 43 is powered on and can adsorb and fix the cap at the discharge port 320, realizing the stable transfer of the cap from the feeding mechanism 3 to the positioning mechanism 4, ensuring the orderliness and accuracy of the cap feeding process, and improving production efficiency.

[0040] Working principle: The guide 31 of the feeding mechanism 3 is inclined. Under the action of gravity, the cap moves along the inner wall of the cavity 310 toward the discharge port 320. When the cap arrives at the discharge port 320 and is opposite to the disc 42 of the positioning mechanism 4, the positioning detection component 6 detects the position of the cap and drives the rotating mechanism 2 to stop. The adsorbent 43 is charged and adsorbs the cap. When the cap gets close, it squeezes the slider 52 of the locking component 5. The slider 52 moves along the guide cylinder 54 and compresses the spring 51. The spring force of the spring 51 makes the slider 52 press against the inner wall of the cap and lock the cap. Next, the battery cell to be welded is loaded into the positioning groove 240 corresponding to the positioning after the cap is positioned, and the cap is in contact with the surface of the electrode tab; the drive component 21 of the rotating mechanism 2 drives the rotating drum 22 to rotate the mounting base 24. The rotating mechanism 2 continues to drive the cap and the battery cell to rotate synchronously toward the welding side to the welding station, where the external welding gun welds. After that, it continues to rotate to the unloading station to unload the material. After completing one welding cycle, the above operation is repeated to achieve continuous automated operation.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning device for welding cylindrical battery caps, characterized in that, It includes a base (1), a rotating mechanism (2), a feeding mechanism (3), and several positioning mechanisms (4), wherein, The rotating mechanism (2) is set on the base (1), and the rotating mechanism (2) has several battery cell stations, on which battery cells to be welded are loaded; The feeding mechanism (3) is set on one side of the rotating mechanism (2) and is set in accordance with the position of each battery cell station, and is used to feed the caps; Several positioning mechanisms (4) are set on the rotating mechanism (2) and are set in accordance with the positions of each battery cell station and the feeding mechanism (3) to clamp and position the cap after feeding. The rotating mechanism (2) drives the battery cell station and the positioning mechanism (4) to rotate synchronously in the circumferential direction toward the welding side, and welds and fixes the cap and the electrode tab of the battery cell to be welded.

2. The positioning device for welding cylindrical battery caps as described in claim 1, characterized in that: The rotating mechanism (2) includes a driving component (21), a rotating cylinder (22), several connecting components (23), and a mounting base (24), wherein, The drive unit (21) is fixed inside the base (1), and the output shaft of the drive unit (21) passes through and extends to the outside of the base (1); The rotating drum (22) is fixed on the output shaft of the drive unit (21); Several connectors (23) are fixed on the outside of the rotating cylinder (22) and are evenly distributed around the center point of the rotating cylinder (22); Several mounting bases (24) are fixed on corresponding connectors (23), and the battery cells to be welded are loaded on the mounting bases (24) to serve as battery cell stations for the rotating mechanism (2).

3. The positioning device for welding cylindrical battery caps as described in claim 2, characterized in that: The mounting base (24) has a positioning groove (240) that matches the cross-section of the battery cell to be welded, and the inner wall of the positioning groove (240) is provided with a protective layer (25). The battery cell to be welded is inserted into the positioning groove (240) and abuts against the surface of the protective layer (25).

4. The positioning device for welding cylindrical battery caps as described in claim 2, characterized in that: Each positioning mechanism (4) includes a base (41), a disc (42), and an adsorption body (43), wherein, The base (41) is vertically fixed to the outside of the rotating cylinder (22) and located directly above the mounting base (24); The disc (42) is fixed to the end of the base (41) away from the rotating cylinder (22), and the diameter of the disc (42) is smaller than the inner diameter of the cap; The adsorbent (43) is fixed on the disc (42) and located at the center of the disc (42) to adsorb and fix the cap that is in place when it is loaded. The adsorbent (43) serves as the adsorption end of the positioning mechanism (4).

5. The positioning device for welding cylindrical battery caps as described in claim 4, characterized in that: It also includes several snap-fit ​​components (5), which are respectively disposed on each disc body (42). The snap-fit ​​components (5) have elastic ends, which can elastically stretch and move in the radial direction of the disc body (42). The adsorbent body (43) adsorbs and fixes the cap, so that the elastic end moves laterally and abuts against the inner wall of the cap, locking the current position of the cap.

6. The positioning device for welding cylindrical battery caps as described in claim 5, characterized in that: The number of snap-fit ​​components (5) provided on each disk (42) is multiple, and the multiple snap-fit ​​components (5) are evenly distributed in a surrounding array around the center point of the disk (42).

7. The positioning device for welding cylindrical battery caps as described in claim 6, characterized in that: The snap-fit ​​assembly (5) includes a spring (51), a slider (52), a guide rod (53), and a guide cylinder (54), wherein, One end of the spring (51) is fixed to the outside of the adsorbent (43), and the other end is fixedly connected to the slider (52), and the end of the slider (52) away from the spring (51) is hemispherical. The guide tube (54) is fixed to the outside of the adsorbent (43) and located inside the spring (51); The guide rod (53) is slidably connected inside the guide cylinder (54), and the other end of the guide rod (53) is fixedly connected to the slider (52).

8. The positioning device for welding cylindrical battery caps as described in claim 4, characterized in that: It also includes a positioning detection component (6), which is fixed on the disc body (42) and coincides with the axis of the disc body (42), and is located inside the adsorbent body (43) to detect the relative position of the cap.

9. The positioning device for welding cylindrical battery caps as described in claim 4, characterized in that: The adsorbent (43) is an electromagnet.

10. The positioning device for welding cylindrical battery caps as described in claim 4, characterized in that: The feeding mechanism (3) includes a guide (31), and a cavity (310) is provided on the inner side of the guide (31). A discharge port (320) communicating with the cavity (310) is provided on the guide (31). The discharge port (320) and the disc (42) are arranged at relative intervals. The cap abuts against the inner wall of the cavity (310) and moves toward the discharge port (320). The adsorbent (43) adsorbs and fixes the cap of the discharge port (320).

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