Filter for cell biology

Abstract

The invention relates to the technical field of filters, and particularly discloses a filter for cell biology, which comprises a cleaning cylinder, a rotating assembly is arranged at the bottom of the cleaning cylinder, a support frame is fixed on one side of the cleaning cylinder, a filtering assembly is arranged in the support frame, and an elastic expansion mechanism is arranged above the filtering assembly. A syringe is arranged in the supporting frame, a scale rod is connected to the interior of the filtering assembly in a sliding and sealing mode, the elastic expanding mechanism comprises a plurality of fan-shaped blocks, contact blocks are arranged at the tops of the fan-shaped blocks, the fan-shaped blocks are enclosed together to form a circular ring shape, and the multiple contact blocks abut against one another to achieve sealing. Through the arrangement of the filter assembly, the elastic expansion mechanism and the scale rod, the elastic force formed by elastic potential energy existing when a spring is compressed is utilized, so that the sealing performance can be automatically kept in the process of injecting to-be-filtered cell sap into the test tube piece after the test tube piece is opened and in the filtering process, and the possibility of being polluted is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and more particularly to a filter for cell biology. Background Art

[0002] During cell culture or tissue processing, there will be cell debris, dead cells, microorganisms, and macromolecular impurities in the culture medium. Filters can effectively intercept these impurities based on pore size, thereby obtaining a relatively pure population of living cells. For research requiring specific cell types, filters can be combined with other techniques (such as density gradient centrifugation) for preliminary sorting. During the cell culture process, solutions such as culture medium and buffers need to be kept sterile to avoid the impact of microbial contamination on cell growth and experimental results. Filters can effectively intercept microorganisms such as bacteria and fungi to ensure the sterility of the solution. This is crucial for long-term cell culture, cell passaging, and various cell experiments.

[0003] Chinese patent publication number CN1814744A discloses a method for making a microfluidic cell filter for filtering or separating cells of different sizes in blood. This method employs a finger-shaped interdigitated fluid channel arrangement method, wherein a fluid inlet chamber and a fluid outlet chamber are provided within a base body, a fluid inlet is provided on the fluid inlet chamber, a fluid outlet is provided in the fluid outlet chamber, and a barrier slit is provided between the fluid inlet chamber and the fluid outlet chamber, and the fluid inlet chamber and the fluid outlet chamber are connected through the barrier slit. This allows for a larger interface area between the inlet and outlet channels, facilitating the creation of more slit structures for blocking. This method generally employs micromachining technology to directly fabricate organelle components or component molds. The cell filter can be made entirely of soft, elastic, and biocompatible materials, allowing for direct implantation in the human body for long-term operation. It is a disposable, low-cost device.

[0004] Therefore, the cell biology filter has a poor automation effect in maintaining a seal during the process of injecting the cell fluid to be filtered into the test tube after opening the test tube and during filtration. In addition, the filter cannot be pre-cleaned in time after being contaminated, which may form stubborn stains and make it more difficult to clean. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a filter for cell biology to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a filter for cell biology, comprising a cleaning cylinder, a rotating assembly provided at the bottom of the cleaning cylinder, a support frame fixed to one side of the cleaning cylinder, a filter assembly provided inside the support frame, an elastic expansion mechanism provided above the filter assembly, and an injection cylinder provided inside the support frame; The elastic expansion mechanism includes a plurality of fan-shaped blocks, a contact block is provided on the top of the fan-shaped block, and the fan-shaped blocks are surrounded together to form a circular ring. The plurality of contact blocks abut against each other to achieve sealing. A guide groove with a larger upper portion and a smaller lower portion is formed at the abutment of the plurality of contact blocks. A support rod is provided on the outside of the fan-shaped block, and a spring is sleeved on the support rod. The spring is located between the fan-shaped block and the filter assembly; Furthermore, the cleaning cylinder includes a cylinder body, and the side walls of the cylinder body are provided with a plurality of arrays of enclosing frames, and the filter assembly can be clamped between the enclosing frames. A rotating hole is opened at the bottom of the cylinder body, and a support ring is provided at the bottom of the cylinder body. A support plate is provided between the side walls of the cylinder body, and the support plate is located at the bottom of the enclosing frame. The bottom of the enclosing frame is provided with a rotating assembly.

[0007] Furthermore, the filter assembly includes a test tube piece, the side wall of the test tube piece is fixedly connected with an external connecting ring, the external connecting ring is annular, the inner ring of the external connecting ring is connected with a filter membrane, the filter membrane is annular, the inner ring of the filter membrane is provided with an internal connecting ring, the inner connecting ring is annular, the internal sliding seal of the filter assembly is connected with a scale rod, the top of the test tube piece is provided with a sealing ring block, the inner ring of the sealing ring block is provided with a circumferential array of dispersed fixed fan plates, the interior of the fixed fan plate is fixedly connected with a sealing blocking ring, the inner diameter of the sealing blocking ring is equal to the outer diameter of the annular injection tube and when the fan block is fully expanded by the annular injection tube, the vertical gap generated by the contact between the two points of the inner diameter of the fan block and the outer diameter of the annular injection tube is blocked by the sealing blocking ring, a number of support brackets are provided on the outside of the test tube piece, and a blocking bracket is provided above the support bracket. The number of blocking brackets corresponds to the number of fan blocks and is connected to each other.

[0008] Furthermore, the support frame includes a frame body, and the frame body is provided with a test tube hole and a syringe hole. The test tube hole is for inserting the filter assembly, and the syringe hole is for inserting the syringe.

[0009] Furthermore, the injection barrel includes an annular injection tube, which is in the shape of an annular tube. A avoidance hole is provided in the middle of the annular injection tube, a hanging block is provided on the outside of the annular injection tube, the inner wall of the annular injection tube is slidably connected to a push sealing ring, the outer side of the push sealing ring is fixedly connected to a pressing rod, and a retractable needle tube is provided on the top of the annular injection tube.

[0010] Furthermore, the rotating assembly includes a motor, the rotating shaft of the motor is connected to the rotating hole key, the rotating shaft key of the motor is connected to a fan, and the fan is located inside the enclosure frame and below the support plate.

[0011] Furthermore, the fan includes a fan ring, an outer array of the fan ring is provided with fan blades, and a groove is provided on one side of the fan blades.

[0012] Furthermore, the scale rod includes a rod body, one side of the rod body is engraved with scale marks, the bottom of the rod body is fixedly connected to a sliding slope, the bottom of the sliding slope is provided with a circular bottom plate, the outer diameter of the circular bottom plate is smaller than the outer diameter of the inner ring.

[0013] Technical effects and advantages of the present invention: 9. The present invention utilizes a filter assembly, an elastic expansion mechanism, and a graduated rod to utilize the elastic force generated by the compressed spring's potential energy. This allows the test tube to automatically maintain a tight seal during both the injection of the cell fluid to be filtered and the filtration process after the test tube is opened, thereby reducing the possibility of contamination.

[0014] 10. The present invention provides a rotating assembly, which facilitates the rotation of the cleaning liquid when the rotating assembly rotates, cleaning the filter assembly and the elastic expansion mechanism. In addition, the grooves on the upper rotating assembly generate eddy currents, which ensures a more thorough cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the structure at point a is enlarged; Figure 4 is a cross-sectional isometric view of the filter assembly of the present invention; Figure 5 It is a schematic diagram of the scale rod structure of the present invention; Figure 6 It is a cross-sectional isometric view of the assembly of the filter assembly, the elastic expansion mechanism and the scale rod of the present invention; Figure 7 This is a schematic diagram of the fan structure of the present invention; Figure 8 This is a schematic structural diagram of the elastic expansion mechanism of the present invention; Figure 9 It is a schematic diagram of the structure of the syringe of the present invention.

[0016] The accompanying drawings are marked as follows: 1. cleaning cylinder; 101. cylinder body; 102. enclosure frame; 103. rotating hole; 104. support ring; 105. support plate; 2. filter assembly; 201. test tube; 202. external ring; 203. filter membrane; 204. internal ring; 205. sealing ring block; 206. blocking frame; 207. support bracket; 208. fixed fan plate; 209. sealing blocking ring; 3. elastic expansion mechanism; 301. fan block; 302. contact block; 303. support rod; 304. elastic expansion mechanism Spring; 4. Support frame; 401. Frame; 402. Test tube hole; 403. Syringe hole; 5. Syringe; 501. Annular syringe; 502. Avoidance hole; 503. Hanging block; 504. Push sealing ring; 505. Press rod; 506. Retractable needle tube; 6. Rotating assembly; 601. Motor; 602. Fan; 6021. Fan ring; 6022. Fan blade; 6023. Groove; 7. Scale rod; 701. Rod body; 702. Scale mark; 703. Slide slope; 704. Round bottom plate. DETAILED DESCRIPTION

[0017] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Furthermore, the various structures described in the following embodiments are merely illustrative. The cell biology filter of the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by persons of ordinary skill in the art without inventive effort are intended to fall within the scope of protection of the present invention.

[0018] Reference Figure 1 、 Figure 3 and Figure 8 The present invention provides a cell biology filter, comprising a cleaning cylinder 1, a rotating assembly 6 being provided at the bottom of the cleaning cylinder 1, a support frame 4 being fixed to one side of the cleaning cylinder 1, a filter assembly 2 being provided inside the support frame 4, an elastic expansion mechanism 3 being provided above the filter assembly 2, an injection cylinder 5 being provided inside the support frame 4, and an inner ring 204 being slidably and sealingly connected to a scale rod 7; The elastic expansion mechanism 3 includes several fan-shaped blocks 301, and a contact block 302 is provided on the top of the fan-shaped block 301. The fan-shaped blocks 301 are surrounded together to form a circular ring. Multiple contact blocks 302 abut against each other to achieve sealing. A guide groove with a larger upper part and a smaller lower part is formed at the abutment of multiple contact blocks 302. A support rod 303 is provided on the outside of the fan-shaped block 301, and a spring 304 is sleeved on the support rod 303. The spring 304 is located between the fan-shaped block 301 and the filter assembly 2.

[0019] In this embodiment, it should be specifically explained that the circular ring shape formed by the sector block 301 and the contact block 302 can maintain sealing.

[0020] The main difference between this embodiment and the prior art is that the elasticity of the spring 304 is utilized in this embodiment to completely seal the filter assembly 2 and also to maintain the seal when opened, specifically in the filter assembly 2, the elastic expansion mechanism 3, and the scale rod 7; The above structure is the main structure of this embodiment, which solves the problem of untimely cleaning of the filter assembly 2.

[0021] Reference Figure 1 and Figure 2 The cleaning cylinder 1 includes a cylinder body 101, and the side walls of the cylinder body 101 are provided with a plurality of arrays of enclosure frames 102, and the enclosure frames 102 can just clamp the filter assembly 2. A rotating hole 103 is opened at the bottom of the cylinder body 101, and a support ring 104 is provided at the bottom of the cylinder body 101. A support plate 105 is provided between the side walls of the cylinder body 101, and the support plate 105 is located at the bottom of the enclosure frame 102. The bottom of the enclosure frame 102 is provided with a rotating assembly 6.

[0022] In this embodiment, it should be specifically explained that: when the filter assembly 2 needs to be pre-cleaned, the filter assembly 2 and the elastic expansion mechanism 3 are placed between the enclosing frame 102 and clamped, and the bottom of the filter assembly 2 is supported by the support plate 105.

[0023] Reference Figure 1 、 Figure 2 、 Figure 4 and Figure 6 The filter assembly 2 includes a test tube 201, the side wall of the test tube 201 is fixedly connected to an outer ring 202, the outer ring 202 is annular, the inner ring of the outer ring 202 is connected to a filter membrane 203, the filter membrane 203 is annular, the inner ring of the filter membrane 203 is provided with an inner ring 204, the inner ring 204 is annular, the top of the test tube 201 is provided with a sealing ring block 205, the inner ring of the sealing ring block 205 is provided with a circumferential array of dispersed fixed fan plates 208, the interior of the fixed fan plates 208 is fixedly connected to a sealing resistance The retaining ring 209, when the inner diameter of the sealing blocking ring 209 is equal to the outer diameter of the annular injection tube 501 and the sector block 301 is fully expanded by the annular injection tube 501, the vertical gap generated by the contact between the two points of the inner diameter of the sector block 301 and the outer diameter of the annular injection tube 501 is blocked by the sealing blocking ring 209. A plurality of support brackets 207 are provided on the outside of the test tube 201, and a retaining frame 206 is provided above the support bracket 207. The number of the retaining frames 206 corresponds to the number of the sector blocks 301 and is connected to each other.

[0024] In this embodiment, it should be specifically explained that: at this time, the sector block 301 moves outward, the spring 304 is compressed, and the sealing ring block 205 is also in sealing contact with the sector block 301 at all times, so the interior of the filter assembly 2 remains sealed. When the outside of the syringe 5 contacts the inner circle of the sector block 301, at this time, the elastic expansion mechanism 3 is fully opened. When the outside of the syringe 5 contacts the fixed fan plate 208, at this time, under the elastic action of the spring 304, the fixed fan plate 208, the sector block 301, the scale rod 7 and the syringe 5 remain relatively sealed.

[0025] Reference Figure 1 and Figure 2 The support frame 4 includes a frame body 401, and the frame body 401 is provided with a test tube hole 402 and a syringe hole 403. The test tube hole 402 is for inserting the filter assembly 2, and the syringe hole 403 is for inserting the syringe barrel 5.

[0026] In this embodiment, it should be specifically explained that when the filter assembly 2 and the syringe 5 are not in use, the filter assembly 2 and the syringe 5 are inserted into the test tube hole 402 and the syringe hole 403 respectively.

[0027] Reference Figure 1 and Figure 9 The syringe 5 includes an annular injection tube 501, which is in the shape of an annular tube. A avoidance hole 502 is provided in the middle of the annular injection tube 501, and a hanging block 503 is provided on the outside of the annular injection tube 501. The inner wall of the annular injection tube 501 is slidably connected to a push sealing ring 504, and the outer side of the push sealing ring 504 is fixedly connected to a pressing rod 505. A retractable needle tube 506 is provided on the top of the annular injection tube 501.

[0028] In this embodiment, it is necessary to specifically explain that: when preparing to absorb the cell fluid to be filtered, the retractable needle tube 506 is placed in the cell fluid, the pressing rod 505 is pulled to drive the sealing ring 504, and a negative pressure is generated inside the annular injection tube 501 to absorb the cell fluid. After the cell fluid is absorbed, the avoidance hole 502 in the injection barrel 5 is aligned with the scale rod 7. At this time, the retractable needle tube 506 is retracted, and the injection barrel 5 is buckled on the elastic expansion mechanism 3, and the injection barrel 5 is allowed to move downward. Since the outer diameter of the annular injection barrel 501 is less than or equal to the connecting rod 7, the retractable needle tube 506 is retracted. The upper inner diameter of the guide groove of the contact block 302, and the aperture of the avoidance hole 502 is the same as the outer diameter of the rod body 701. The injection barrel 5 moves downward while stretching out the four matching elastic expansion mechanisms 3. At this time, the fan-shaped block 301 moves outward, and the spring 304 is compressed. When the outside of the annular injection tube 501 contacts the inner circle of the fixed fan plate 208, the retractable needle tube 506 extends, pressing the pressing rod 505, driving the sealing ring 504, and the cell fluid to be filtered inside the annular injection tube 501 is injected above the filter membrane 203.

[0029] Reference Figure 2The rotating assembly 6 includes a motor 601, the rotating shaft of the motor 601 is keyed to the rotating hole 103, and the rotating shaft of the motor 601 is keyed to a fan 602, which is located inside the enclosure 102 and below the support plate 105.

[0030] In this embodiment, it should be specifically explained that: when the filter assembly 2 and the elastic expansion mechanism 3 need to be cleaned, the motor 601 is started, and the motor 601 drives the fan 602 to rotate to clean the filter assembly 2 and the elastic expansion mechanism 3.

[0031] Reference Figure 2 and Figure 7 The fan 602 includes a fan ring 6021, an outer array of fan blades 6022, and a groove 6023 is provided on one side of the fan blades 6022.

[0032] In this embodiment, it should be specifically explained that: when the fan 602 rotates, the groove 6023 generates eddy currents, which pre-clean the filter assembly 2 and the elastic expansion mechanism 3 more thoroughly.

[0033] Reference Figure 2 、 Figure 5 and Figure 6 The scale rod 7 includes a rod body 701, a scale mark 702 is engraved on one side of the rod body 701, a sliding slope 703 is fixedly connected to the bottom of the rod body 701, and a round bottom plate 704 is provided at the bottom of the sliding slope 703. The outer diameter of the round bottom plate 704 is smaller than the outer diameter of the inner ring 204.

[0034] In this embodiment, it should be specifically explained that: the cell fluid is continuously filtered, and the buoyancy of the gradually rising liquid level causes the scale rod 7 to rise. The buoyancy is always greater than the sealing force between the filter component 2 and the scale rod 7. At this time, the outside world can know the amount of filtered cell fluid through the scale mark 702.

[0035] The specific steps are as follows: First, prepare to absorb the cell fluid to be filtered, put the retractable needle tube 506 into the cell fluid, pull the pressing rod 505, drive the sealing ring 504, and generate negative pressure inside the annular injection tube 501 to absorb the cell fluid. After the cell fluid is absorbed, align the avoidance hole 502 in the injection barrel 5 with the scale rod 7. At this time, the retractable needle tube 506 is retracted, and the injection barrel 5 is buckled on the elastic expansion mechanism 3, allowing the injection barrel 5 to move downward. Since the outer diameter of the annular injection barrel 501 is less than or equal to the contact block 30, the outer diameter of the annular injection barrel 501 is less than or equal to the contact block 30. 2, and the aperture of the avoidance hole 502 is the same as the outer diameter of the rod body 701. When the injection cylinder 5 moves downward, the four matching elastic expansion mechanisms 3 are opened. At this time, the sector block 301 moves outward, and the spring 304 is compressed. When the outer surface of the annular injection tube 501 contacts the inner circle of the sector block 301, the elastic expansion mechanism 3 is fully opened. When the outer surface of the annular injection tube 501 contacts the sealing blocking ring 209, the sector block 301 is fully supported by the annular injection tube 501. When the syringe is opened, the vertical gap between the two points of the inner diameter of the sector block 301 and the outer diameter of the annular injection tube 501 is blocked by the sealing blocking ring 209. At this time, under the elastic action of the spring 304, the fixed sector plate 208, the sealing blocking ring 209, the sector block 301, the scale rod 7 and the syringe 5 are kept relatively sealed. At this time, the retractable needle tube 506 is extended, pressing the pressing rod 505, driving the sealing ring 504, and the cell fluid to be filtered inside the annular injection tube 501 is injected into the filter. The syringe 5 is then pulled out of the filter assembly 2 because the spring 304 causes the sector 301 to contract and eventually fit into the outer diameter of the scale rod 7. The test tube 201, sector 301, and scale rod 7 remain sealed. The cell fluid continues to be filtered, and the buoyancy of the gradually rising liquid level causes the scale rod 7 to rise. This buoyancy is always greater than the sealing force between the filter assembly 2 and the scale rod 7. The outside world can now know the amount of filtered cell fluid through the scale marks 702. After the filtration is completed, the filtered cell fluid is collected, and the assembled filter component 2 and elastic expansion mechanism 3 are placed between the enclosing frame 102. The bottom of the filter component 2 is supported by the support plate 105. The cleaning liquid is injected into the cylinder 101 until the filter component 2 and the elastic expansion mechanism 3 are completely immersed. The motor 601 is started, and the motor 601 drives the fan 602 to rotate. The groove 6023 contacts the cleaning liquid to generate eddy currents, and the eddy currents continuously pre-clean the filter component 2 and the elastic expansion mechanism 3.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filter for cell biology, comprising a cleaning cartridge (1), characterized in that: A rotating assembly (6) is provided at the bottom of the cleaning cylinder (1), a support frame (4) is fixed to one side of the cleaning cylinder (1), a filter assembly (2) is provided inside the support frame (4), an elastic expansion mechanism (3) is provided above the filter assembly (2), and an injection cylinder (5) is provided inside the support frame (4); The elastic expansion mechanism (3) comprises a plurality of fan-shaped blocks (301), a contact block (302) being provided on the top of each fan-shaped block (301), the fan-shaped blocks (301) being surrounded together to form a circular ring, the plurality of contact blocks (302) being in contact with each other to achieve sealing, a guide groove being formed at the contacting position of the plurality of contact blocks (302), a support rod (303) being provided on the outside of each fan-shaped block (301), a spring (304) being sleeved on the support rod (303), and the spring (304) being located between the fan-shaped block (301) and the filter assembly (2).

2. A cell biology filter according to claim 1, characterized in that: The cleaning cylinder (1) comprises a cylinder (101), the side walls of the cylinder (101) are provided with a plurality of arrayed enclosure frames (102), the enclosure frames (102) being just large enough to hold the filter assembly (2), a rotation hole (103) being provided at the bottom of the cylinder (101), a support ring (104) being provided at the bottom of the cylinder (101), a support plate (105) being provided between the side walls of the cylinder (101), the support plate (105) being located at the bottom of the enclosure frames (102), and a rotation assembly (6) being provided at the bottom of the enclosure frames (102).

3. The cell biology filter according to claim 1, characterized in that: The filter assembly (2) comprises a test tube member (201), the side wall of the test tube member (201) is fixedly connected to an outer connecting ring (202), the outer connecting ring (202) is annular, the inner ring of the outer connecting ring (202) is connected to a filter membrane (203), the filter membrane (203) is annular, the inner ring of the filter membrane (203) is provided with an inner connecting ring (204), the inner connecting ring (204) is annular, and the inner connecting ring (204) is slidably sealed with a scale rod (7), the top of the test tube member (201) is provided with a sealing ring block (205), the inner ring of the sealing ring block (205) is provided with a circumferential array of dispersed fixed fan plates (208), the fixed fan plates ( A sealing blocking ring (209) is fixedly connected to the inside of the test tube (208), and the inner diameter of the sealing blocking ring (209) is equal to the outer diameter of the annular injection tube (501). When the sector block (301) is fully opened by the annular injection tube (501), the vertical gap generated by the contact between the two points of the inner diameter of the sector block (301) and the outer diameter of the annular injection tube (501) is blocked by the sealing blocking ring (209). A plurality of support brackets (207) are provided on the outside of the test tube (201), and a blocking bracket (206) is provided above the support bracket (207). The number of the blocking brackets (206) corresponds to the number of the sector blocks (301) and is connected to each other.

4. The cell biology filter according to claim 1, characterized in that: The support frame (4) includes a frame body (401), and the frame body (401) is provided with a test tube hole (402) and a syringe hole (403). The test tube hole (402) is for inserting the filter assembly (2), and the syringe hole (403) is for inserting the syringe (5).

5. The cell biology filter according to claim 1, characterized in that: The injection barrel (5) comprises an annular injection tube (501), which is annular and cylindrical in shape. A avoidance hole (502) is provided in the middle of the annular injection tube (501), a hanging block (503) is provided on the outside of the annular injection tube (501), a push sealing ring (504) is slidably connected to the inner wall of the annular injection tube (501), a pressing rod (505) is fixedly connected to the outside of the push sealing ring (504), and a retractable needle tube (506) is provided on the top of the annular injection tube (501).

6. The cell biology filter according to claim 2, characterized in that: The rotating assembly (6) comprises a motor (601), the rotating shaft of the motor (601) is keyed to the rotating hole (103), the rotating shaft of the motor (601) is keyed to a fan (602), and the fan (602) is located inside the enclosure frame (102) and below the support plate (105).

7. The cell biology filter according to claim 6, characterized in that: The fan (602) comprises a fan ring (6021), an outer array of fan blades (6022) is provided on the fan ring (6021), and a groove (6023) is provided on one side of the fan blades (6022).

8. The cell biology filter according to claim 3, characterized in that: The scale rod (7) comprises a rod body (701), a scale mark (702) is engraved on one side of the rod body (701), a sliding slope (703) is fixedly connected to the bottom of the rod body (701), and a circular bottom plate (704) is provided at the bottom of the sliding slope (703), and the outer diameter of the circular bottom plate (704) is smaller than the outer diameter of the inner ring (204).

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