A feed probiotics cultivation device

Abstract

The present invention provides a feed probiotic cultivation device, which relates to the technical field of probiotic cultivation, and comprises a heat-insulating installation part, on which a closed rotating switching device is installed; the characteristic is that: a picking auxiliary part is slidably installed on the heat-insulating installation part; a cultivation carrier is slidably plugged on the closed rotating switching device; an isolation auxiliary device is threadedly connected on the cultivation carrier; a collection auxiliary part is fixedly installed inside the isolation auxiliary device; a circle of closed protective parts is slidably installed on the closed rotating switching device, which can assist in the rapid filtration of nutrient solution culture medium, quickly retain bacterial colonies, and ensure the efficiency of bacterial colony extraction. At the same time, the use of this structure is more convenient for rapid aseptic isolation, which can ensure sanitary quality, and the overall structure is simpler and more reasonable, which solves the problem that the current operation method is cumbersome and inefficient, and at the same time, it is not convenient for independent heat preservation and sterilization control of multiple culture dishes.

Description

Technical Field

[0001] The invention relates to the technical field of probiotics cultivation, and in particular to a feed probiotics cultivation device. Background Art

[0002] At present, the application of probiotic mixed feed is becoming more and more widespread. Probiotic fermented feed can reduce the acidity in the stomach of piglets, increase the feed intake of piglets, thereby improving their production performance. At the same time, it can effectively inhibit the growth and reproduction of harmful bacteria, control diarrhea in piglets, and reduce the use of antibiotics. At present, in the process of probiotic cultivation, the time for strain cultivation needs to be in multiple links such as strain cultivation, separation, screening, cultivation, and quality inspection. Among them, inoculation loops and other instruments are required to assist in separation one by one during the separation work. The current operation method is cumbersome and inefficient. At the same time, it is not convenient for independent insulation and sterilization control of multiple culture dishes. Placing culture dishes of different times at one time is easy to cause cross infection and affect the temperature control effect. Summary of the invention

[0003] The present invention relates to a feed probiotics cultivation device. The isolation auxiliary device thereof can, on the one hand, assist in the rapid filtration of nutrient solution culture medium, rapidly retain bacterial colonies, and ensure the efficiency of bacterial colony extraction. Meanwhile, the structure is more convenient for rapid aseptic isolation, which can ensure sanitary quality and make the overall structure simpler and more reasonable.

[0004] Specifically, the present invention provides a feed probiotic cultivation device, which specifically includes a heat-insulating mounting part, on which a closed rotating switching device is installed; it is characterized in that: a picking auxiliary part is slidably mounted on the heat-insulating mounting part; a cultivation carrier is slidably plugged on the closed rotating switching device; an isolation auxiliary device is threadedly connected to the cultivation carrier; a collection auxiliary part is fixedly installed inside the isolation auxiliary device; a circle of closed protective parts is slidably mounted on the closed rotating switching device; the closed protective parts are aligned with the isolation auxiliary device; the picking auxiliary parts electromagnetically adsorb the cultivation carrier; the heat-insulating mounting part includes: a rotating mounting shell, a picking auxiliary tube, a supporting mounting ring, an air intake mounting tube and a rotating mounting ring, the rotating mounting shell and the picking auxiliary tube are a double-layer insulation structure; a supporting mounting ring is fixedly mounted on the bottom of the rotating mounting shell, and a circle of through holes is provided on the supporting mounting ring; the air intake mounting tube is fixedly mounted on the rotating mounting shell through a circle of brackets; the rotating mounting ring is fixedly mounted on the bottom of the air intake mounting tube.

[0005] In at least some embodiments, the isolation auxiliary device includes: an isolation mounting shell and isolation filter paper, the isolation mounting shell is provided with threads; the isolation mounting shell is threadedly connected to the protective cover; the isolation filter paper is fixedly mounted on the bottom of the isolation mounting shell; the bottom of the isolation mounting shell is a conical structure; and a ring magnet is provided at the bottom of the isolation mounting shell.

[0006] In at least some embodiments, the culture carrier includes: a culture dish, a protective cover and a connecting magnet, the culture dish is slidably inserted into a slot provided on the closed rotating block; the sliding cover on the culture dish is equipped with a protective cover; the protective cover is fixedly embedded with a connecting magnet; the connecting magnet is aligned with the electromagnet.

[0007] In at least some embodiments, the heat-insulating mounting portion further includes: observation windows, wherein a circle of observation windows is provided, and the circle of observation windows are respectively fixedly embedded in the top of the rotating mounting shell.

[0008] In at least some embodiments, the collecting auxiliary component includes: a collecting auxiliary mounting frame, a rotating mounting shaft and a rotating scraper, the collecting auxiliary mounting frame is fixedly welded inside the isolation mounting shell; a rotating mounting shaft is rotatably mounted on the collecting auxiliary mounting frame; a hand wheel is provided on the top of the rotating mounting shaft; the rotating scraper is fixedly mounted on the bottom of the rotating mounting shaft; the rotating scraper is attached to the isolation filter paper and the isolation mounting shell.

[0009] In at least some embodiments, the closed protective member includes: a closed sliding column and an electric push rod, the closed sliding column is slidably mounted on the closed rotating block; the closed sliding column is aligned with a slot hole provided on the closed rotating block; the electric push rod is fixedly mounted on the closed sliding column; and the output shaft of the electric push rod is welded inside the closed rotating block.

[0010] In at least some embodiments, the closed rotation switching device includes: a rotary drive motor, a closed rotating block, an electric heating plate and an ultraviolet sterilization lamp; the rotary drive motor is fixedly mounted on the bottom of the rotating mounting shell; the closed rotating block rotatably fits inside the rotating mounting shell; a circle of slots is provided on the closed rotating block; the closed rotating block is fixedly mounted on the output shaft of the rotary drive motor; the electric heating plate is fixedly embedded inside the closed rotating block; the electric heating plate is connected to an external power supply; the ultraviolet sterilization lamp is provided with a circle, and a circle of ultraviolet sterilization lamps are respectively fixedly mounted inside the closed rotating block; a rotating mounting ring is rotatably connected to the closed rotating block.

[0011] In at least some embodiments, the closed rotation switching device also includes: ventilation auxiliary holes, which are provided with a circle of ventilation auxiliary holes, and the circle of ventilation auxiliary holes are respectively aligned with a circle of slot holes provided on the closed rotation block; the circle of ventilation auxiliary holes are respectively connected to the air intake mounting pipes.

[0012] In at least some embodiments, the picking-up auxiliary component includes: a sliding closure plug, an electromagnet and a hand-held rod, wherein the sliding closure plug is slidably mounted on the picking-up auxiliary tube; an electromagnet is fixedly mounted on the bottom of the sliding closure plug, and the electromagnet is externally connected to a control power supply; and the hand-held rod is fixedly mounted on the sliding closure plug.

[0013] In at least some embodiments, the closed protective member also includes: a closed mounting cover and a closed magnet, the closed mounting cover is slidably inserted on the closed sliding column; a closed magnet is fixedly embedded on the closed mounting cover; a rubber coating is provided on the closed mounting cover; and the closed magnet is a ring magnet.

[0014] The present invention provides a feed probiotics cultivation device, which has the following beneficial effects:

[0015] The collecting auxiliary part provided in the present invention can realize the rapid scraping and collecting of probiotic colonies by rotation, thereby ensuring the extraction efficiency after colony separation. In conjunction with the isolation auxiliary device, the culture medium can be quickly diverted by filtration to retain attached colonies. There is no need to use a traditional inoculation loop for separation and extraction, thereby improving the separation efficiency of bacterial strains. At the same time, the structure does not have the problem of inoculation rod removal, and has a good aseptic effect. It plays a positive role in promoting the high-quality cultivation of probiotics and also increases production capacity.

[0016] In addition, by adopting the set closed protective parts, auxiliary closed protection can be achieved, which can effectively prevent the isolation filter paper from being contaminated after taking the isolation installation shell, effectively ensure the quality of probiotic extraction, optimize the cultivation process, and make it more hygienic and reasonable. At the same time, this structure adopts an electric propulsion structure, which is easy to disassemble and reuse.

[0017] In addition, by adopting the set insulation installation part in conjunction with the closed rotation switching device, auxiliary closed insulation work can be achieved. At the same time, the closed rotating block adopts a circle of slots and an auxiliary tube to achieve independent individual taking, which can ensure the insulation effect and will not cause temperature loss and affect the quality of strain cultivation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0019] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached picture:

[0021] Figure 1 A schematic diagram showing the overall structure of the cultivation device of the present application;

[0022] Figure 2 A schematic diagram showing the overall structure of the bottom of the cultivation device of the present application is shown;

[0023] Figure 3 A schematic diagram showing the overall structure of the thermal insulation installation part of the present application is shown;

[0024] Figure 4A cross-sectional view showing the overall internal structure of the thermal insulation installation part of the present application;

[0025] Figure 5 A schematic diagram showing the overall structure of the closed rotation switching device of the present application

[0026] Figure 6 A schematic diagram showing the overall structure of the picking aid of the present application;

[0027] Figure 7 A schematic diagram showing the overall structure of the cultivation carrier of the present application;

[0028] Figure 8 A schematic diagram showing the overall structure of the isolation auxiliary device of the present application;

[0029] Fig. 9 A schematic diagram showing the overall structure of the collection auxiliary component of the present application;

[0030] Fig.10 A schematic diagram showing the overall structure of the closed protective member of the present application is shown.

[0031] Reference numerals list

[0032] 1. Insulation installation part; 101. Rotating installation shell; 102. Taking auxiliary pipe; 103. Support installation ring; 104. Air intake installation pipe; 105. Rotating installation ring; 106. Observation window;

[0033] 2. Closed rotation switching device; 201. Rotation drive motor; 202. Closed rotation block; 203. Electric heating plate; 204. Ultraviolet sterilization lamp; 205. Ventilation auxiliary hole;

[0034] 3. Pick-up auxiliary parts; 301. Sliding closure plug; 302. Electromagnet; 303. Hand-held rod;

[0035] 4. Cultivation carrier; 401. Cultivation dish; 402. Protective cover; 403. Connecting magnet;

[0036] 5. Isolation auxiliary device; 501. Isolation mounting shell; 502. Isolation filter paper;

[0037] 6. Collection auxiliary parts; 601. Collection auxiliary mounting frame; 602. Rotating mounting shaft; 603. Rotating scraper;

[0038] 7. Closed protective part; 701. Closed sliding column; 702. Electric push rod; 703. Closed mounting cover; 704. Closed magnet. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figures 1 to 10 :

[0041] The present invention proposes a feed probiotic cultivation device, comprising a heat preservation installation part 1, on which a closed rotation switching device 2 is installed; a picking auxiliary part 3 is slidably installed on the heat preservation installation part 1; a cultivation carrier 4 is slidably plugged on the closed rotation switching device 2; an isolation auxiliary device 5 is threadedly connected to the cultivation carrier 4; a collection auxiliary part 6 is fixedly installed inside the isolation auxiliary device 5; a circle of closed protective parts 7 are slidably installed on the closed rotation switching device 2; the closed protective part 7 is aligned with the isolation auxiliary device 5; the picking auxiliary part 3 is electromagnetically adsorbed Cultivation carrier 4; the insulation installation part 1 includes: a rotating installation shell 101, a picking auxiliary tube 102, a support installation ring 103, an air intake installation tube 104 and a rotating installation ring 105, the rotating installation shell 101 and the picking auxiliary tube 102 are a double-layer insulation structure; a support installation ring 103 is fixedly installed on the bottom of the rotating installation shell 101, and a circle of through holes is provided on the support installation ring 103; the air intake installation tube 104 is fixedly installed on the rotating installation shell 101 through a circle of brackets; the rotating installation ring 105 is fixedly installed on the bottom of the air intake installation tube 104.

[0042] In the embodiment of the present disclosure, the heat preservation installation part 1 also includes: an observation window 106, the observation window 106 is provided with a circle, and the circle of observation windows 106 are respectively fixedly embedded in the top of the rotating installation shell 101; the closed rotation switching device 2 includes: a rotating drive motor 201, a closed rotating block 202, an electric heating plate 203 and an ultraviolet sterilization lamp 204; the rotating drive motor 201 is fixedly installed at the bottom of the rotating installation shell 101; the closed rotating block 202 is rotatably fitted inside the rotating installation shell 101; a circle of slots is provided on the closed rotating block 202; the closed The rotating block 202 is fixedly mounted on the output shaft of the rotating drive motor 201; the electric heating plate 203 is fixedly embedded in the closed rotating block 202; the electric heating plate 203 is externally connected to the power supply; the ultraviolet sterilization lamp 204 is provided with a circle, and the circle of ultraviolet sterilization lamps 204 are respectively fixedly mounted in the closed rotating block 202; the closed rotating block 202 is rotatably connected with a rotating mounting ring 105; the closed rotating switching device 2 also includes: ventilation auxiliary holes 205, the ventilation auxiliary holes 205 are provided with a circle, and the circle of ventilation auxiliary holes 205 are respectively connected to the closed rotating block 20 2 is aligned with a circle of slots provided on the upper surface; a circle of ventilation auxiliary holes 205 are respectively connected to the air inlet installation pipe 104; the taking auxiliary part 3 includes: a sliding sealing plug 301, an electromagnet 302 and a hand-held rod 303, the sliding sealing plug 301 is slidably installed on the taking auxiliary pipe 102; an electromagnet 302 is fixedly installed at the bottom of the sliding sealing plug 301, and the electromagnet 302 is externally connected to a control power supply; the hand-held rod 303 is fixedly installed on the sliding sealing plug 301, and the heat preservation installation part 1 is used to cooperate with the closed rotation switching device 2, so as to realize auxiliary sealing. The closed insulation work is carried out, and at the same time, the closed rotating block 202 adopts a circle of slots, and the auxiliary tube 102 is used to realize independent single taking, which can ensure the insulation effect. It does not need to open the box door to take the culture dish like the traditional constant temperature box, which will cause hypothermia and affect the quality of bacterial cultivation. At the same time, the air intake installation tube 104 is used for oxygenation, and the overall structure is more reasonable. The ventilation auxiliary hole 205 is used to evenly guide the air, and the sliding closing plug 301 is pulled out, and the electromagnet 302 can be used to pass the electromagnetic suction protective cover 402 to extract the colony. The use method is simple and convenient.

[0043] In the embodiment of the present disclosure, the culture carrier 4 includes: a culture dish 401, a protective cover 402 and a connecting magnet 403, the culture dish 401 is slidably inserted into a slot provided on the closed rotating block 202; the sliding cover on the culture dish 401 is equipped with a protective cover 402; the connecting magnet 403 is fixedly embedded on the protective cover 402; the connecting magnet 403 is aligned with the electromagnet 302; the isolation auxiliary device 5 includes: an isolation mounting shell 501 and an isolation filter paper 502, the isolation mounting shell 501 is provided with threads; the isolation mounting shell 501 is threadedly connected to the protective cover 402; the isolation filter paper 502 is fixedly installed at the bottom of the isolation mounting shell 501; the bottom of the isolation mounting shell 501 is a conical structure; the bottom of the isolation mounting shell 501 is provided with a ring magnet; the collection auxiliary part 6 includes: a collection auxiliary mounting frame 601, a rotating mounting shaft 602 and a rotating scraper 603, the collection auxiliary mounting frame 601 is fixedly welded to the isolation mounting The inside of the shell 501; a rotating mounting shaft 602 is rotatably mounted on the collecting auxiliary mounting frame 601; a hand wheel is provided on the top of the rotating mounting shaft 602; a rotating scraper 603 is fixedly mounted on the bottom of the rotating mounting shaft 602; the rotating scraper 603 is attached to the isolation filter paper 502 and the isolation mounting shell 501, and the set collecting auxiliary part 6 can realize the rapid scraping and collecting of probiotic colonies by rotation, which is simple to operate and ensures the extraction efficiency after colony separation. With the use of the isolation auxiliary device 5, the culture medium can be quickly diverted by filtering and the attached colonies are retained. There is no need to use a traditional inoculation loop for separation and extraction, which improves the separation efficiency of the strains. At the same time, the structure does not have the inoculation rod release, has a good sterile effect, and is easy to operate as a whole. The rotating scraper 603 can be driven to scrape the colonies by rotating the rotating mounting shaft 602, which is convenient for unified extraction and the overall structure is more reasonable and efficient.

[0044] Embodiment 2, on the basis of embodiment 1, the closed protective member 7 comprises: a closed sliding column 701 and an electric push rod 702, the closed sliding column 701 is slidably mounted on the closed rotating block 202; the closed sliding column 701 is aligned with the slot provided on the closed rotating block 202; the electric push rod 702 is fixedly mounted on the closed sliding column 701; the output shaft of the electric push rod 702 is welded inside the closed rotating block 202; the closed protective member 7 also comprises: a closed mounting cover 703 and a closed magnet 704, the closed mounting cover 703 is slidably plugged into the closed sliding column 701; the closed mounting cover A closed magnet 704 is fixedly embedded on 703; a rubber coating is provided on the closed mounting cover 703; the closed magnet 704 is a ring-shaped magnet, and by adopting the set closed protective member 7, auxiliary closed protection can be achieved, which can effectively prevent the isolation filter paper 502 from being contaminated after taking the isolation mounting shell 501, and can effectively ensure the quality of probiotic extraction. At the same time, this structure adopts an electric propulsion structure, which is more convenient, and can use the magnetic suction structure for rapid closed protection, which is easy to disassemble and reuse. The closed magnet 704 magnetically attracts the isolation mounting shell 501 to quickly perform closed protection work.

[0045] A method for cultivating probiotics in feed: first, an oxygen cylinder is connected through an air inlet installation tube 104, and air is uniformly guided through an auxiliary ventilation hole 205. When a culture dish 401 needs to be taken, the closed rotating block 202 is driven by a rotating driving motor 201 to rotate the culture dish 401 to be taken to the auxiliary taking tube 102, and the sliding closing plug 301 is pulled out, and the electromagnet 302 can be used to pass the electromagnetic suction protective cover 402 to extract the colony. The method of use is simple and convenient. The ultraviolet sterilization lamp 204 can be used to sterilize before cultivation, and the electric heating plate 203 can be powered on for constant temperature heating. When the protective cover 402 is pulled up, the isolation installation shell 50 1 is moved up, and the position of the culture dish 401 remains unchanged. At this time, the isolation filter paper 502 can be used for filtering. After the filtering is completed, the isolation mounting shell 501 can be rotated and disassembled, and the rotating mounting shaft 602 can be rotated to drive the rotating scraper 603 to scrape the colonies for unified extraction. When the isolation mounting shell 501 is pulled up for filtering, the electric push rod 702 pushes the closed sliding column 701 to move, and the closed magnet 704 is magnetically attracted by the annular magnet at the bottom of the isolation mounting shell 501, so that the closed mounting cover 703 can be attached to the isolation filter paper 502 for closed protection, and the internal culture situation can be observed through the observation window 106.

Claims

1. A feed probiotics cultivation device, comprising a heat-insulating installation part (1), on which a closed rotation switching device (2) is installed; characterized in that: The heat-insulating mounting portion (1) is slidably mounted with a taking-up auxiliary component (3); the closed rotating switching device (2) is slidably plugged with a cultivation carrier (4); the cultivation carrier (4) is threadedly connected with an isolation auxiliary device (5); a collection auxiliary component (6) is fixedly mounted inside the isolation auxiliary device (5); a circle of closed protective components (7) is slidably mounted on the closed rotating switching device (2); the closed protective component (7) is aligned with the isolation auxiliary device (5); the taking-up auxiliary component (3) electromagnetically absorbs the cultivation carrier (4); the heat-insulating mounting portion (1) comprises: a rotating mounting portion A mounting shell (101), a taking auxiliary tube (102), a supporting mounting ring (103), an air intake mounting tube (104) and a rotating mounting ring (105); the rotating mounting shell (101) and the taking auxiliary tube (102) are double-layer heat-insulating structures; a supporting mounting ring (103) is fixedly mounted on the bottom of the rotating mounting shell (101), and a circle of through holes is provided on the supporting mounting ring (103); the air intake mounting tube (104) is fixedly mounted on the rotating mounting shell (101) through a circle of brackets; the rotating mounting ring (105) is fixedly mounted on the bottom of the air intake mounting tube (104); The picking-up auxiliary component (3) comprises: a sliding closing plug (301), an electromagnet (302) and a hand-held rod (303); the sliding closing plug (301) is slidably mounted on the picking-up auxiliary tube (102); the electromagnet (302) is fixedly mounted on the bottom of the sliding closing plug (301), and the electromagnet (302) is externally connected to a control power supply; the hand-held rod (303) is fixedly mounted on the sliding closing plug (301); The culture carrier (4) comprises: a culture dish (401), a protective cover (402) and a connecting magnet (403); the culture dish (401) is slidably inserted into a slot provided on the closed rotating block (202); the sliding cover on the culture dish (401) is provided with a protective cover (402); the connecting magnet (403) is fixedly embedded on the protective cover (402); the connecting magnet (403) is aligned with the electromagnet (302); The isolation auxiliary device (5) comprises: an isolation mounting shell (501) and an isolation filter paper (502); the isolation mounting shell (501) is provided with a thread; the isolation mounting shell (501) is threadedly connected to the protective cover (402); the isolation filter paper (502) is fixedly mounted on the bottom of the isolation mounting shell (501); the bottom of the isolation mounting shell (501) is a conical structure; and the bottom of the isolation mounting shell (501) is provided with a ring magnet; The collecting auxiliary component (6) includes: a collecting auxiliary mounting frame (601), a rotating mounting shaft (602) and a rotating scraper (603); the collecting auxiliary mounting frame (601) is fixedly welded inside the isolation mounting shell (501); a rotating mounting shaft (602) is rotatably mounted on the collecting auxiliary mounting frame (601); a hand wheel is provided on the top of the rotating mounting shaft (602); the rotating scraper (603) is fixedly mounted on the bottom of the rotating mounting shaft (602); the rotating scraper (603) is attached to the isolation filter paper (502) and the isolation mounting shell (501).

2. A feed probiotics cultivation device according to claim 1, characterized in that: The heat-insulating installation part (1) further comprises: observation windows (106), wherein the observation windows (106) are provided in a circle, and the circle of observation windows (106) are respectively fixedly embedded in the top of the rotating installation shell (101).

3. A feed probiotics cultivation device according to claim 1, characterized in that: The closed rotation switching device (2) comprises: a rotary drive motor (201), a closed rotation block (202), an electric heating plate (203) and an ultraviolet sterilization lamp (204); The rotary drive motor (201) is fixedly mounted on the bottom of the rotary mounting shell (101); the closed rotating block (202) is rotatably fitted inside the rotary mounting shell (101); a circle of slots is provided on the closed rotating block (202); the closed rotating block (202) is fixedly mounted on the output shaft of the rotary drive motor (201); the electric heating plate (203) is fixedly embedded inside the closed rotating block (202); the electric heating plate (203) is externally connected to a power source; the ultraviolet sterilization lamp (204) is provided with a circle, and the circle of ultraviolet sterilization lamps (204) are respectively fixedly mounted inside the closed rotating block (202); and a rotary mounting ring (105) is rotatably connected to the closed rotating block (202).

4. A feed probiotics cultivation device according to claim 3, characterized in that: The closed rotation switching device (2) further comprises: ventilation auxiliary holes (205), wherein the ventilation auxiliary holes (205) are provided in a circle, and the circle of ventilation auxiliary holes (205) are respectively aligned with a circle of slot holes provided on the closed rotation block (202); and the circle of ventilation auxiliary holes (205) are respectively connected to the air intake installation pipe (104).

5. A feed probiotics cultivation device according to claim 3, characterized in that: The closed protective member (7) comprises: a closed sliding column (701) and an electric push rod (702); the closed sliding column (701) is slidably mounted on the closed rotating block (202); the closed sliding column (701) is aligned with a slotted hole provided on the closed rotating block (202); the electric push rod (702) is fixedly mounted on the closed sliding column (701); and the output shaft of the electric push rod (702) is welded inside the closed rotating block (202).

6. A feed probiotics cultivation device according to claim 5, characterized in that: The closed protective member (7) further comprises: a closed mounting cover (703) and a closed magnet (704); the closed mounting cover (703) is slidably inserted on the closed sliding column (701); the closed magnet (704) is fixedly embedded on the closed mounting cover (703); the closed mounting cover (703) is provided with a rubber coating; and the closed magnet (704) is a ring-shaped magnet.

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