Powder filling mechanism

Abstract

The utility model belongs to the technical field of filling, and particularly relates to a powder filling mechanism which comprises a lifter and a lifting motor connected with the lifter, a lifting cross beam is assembled on the lifter, a filling supporting column and a powder feeding supporting column which are vertically arranged are fixedly connected to the lifting cross beam, and a powder feeding swing arm is connected to the upper end of the powder feeding supporting column through a screw. A powder feeding screw mechanism is assembled on the powder feeding swing arm, a butterfly valve is installed on the powder feeding screw mechanism, a raw material barrel is fixedly connected to the upper end of the butterfly valve, a screw filling mechanism is fixedly connected to the upper end of the filling supporting column and communicates with the powder feeding screw mechanism, and a filling power mechanism is installed at the upper end of the screw filling mechanism. The screw filling mechanism comprises a powder filling seat fixedly connected to the filling supporting column, and the lower end of the powder filling seat is fixedly connected with a powder cover. According to the utility model, a high-efficiency filling mechanism can be provided, the manpower is reduced, and the production cost of foods and medicines is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of filling, and particularly relates to a powder filling mechanism. Background Art

[0002] With the rapid development of modern industry, the production efficiency requirements for food and medicine are getting higher and higher, and the traditional manual filling method can no longer meet the needs of modern production.

[0003] During the powder filling process, traditional filling equipment, such as a powder filling machine disclosed in Chinese patent publication number CN218055682U, often requires manual assistance for multiple operations, which increases labor costs. Especially in large-scale production environments, traditional filling equipment is difficult to achieve efficient and stable filling, which becomes a bottleneck restricting production efficiency and cost control. To this end, we propose a powder filling mechanism. Utility Model Content

[0004] The purpose of the utility model is to provide a powder filling mechanism, which can provide a high-efficiency filling mechanism, reduce manpower and lower the production cost of food and medicine.

[0005] The technical solutions adopted by this utility model are as follows:

[0006] A powder filling mechanism comprises a lifter and a lifting motor connected to the lifter; the lifter is equipped with a lifting beam, a vertically arranged filling support column and a powder feeding support column are fixedly connected to the lifting beam, the upper end of the powder feeding support column is screwed to a powder feeding swing arm, the powder feeding swing arm is equipped with a powder feeding screw mechanism, the powder feeding screw mechanism is installed with a butterfly valve, and the upper end of the butterfly valve is fixedly connected to a raw material barrel;

[0007] The upper end of the filling support column is fixedly connected with a screw filling mechanism, the screw filling mechanism is communicated with a powder feeding screw mechanism, and the upper end of the screw filling mechanism is installed with a filling power mechanism.

[0008] Furthermore, the screw filling mechanism includes a powder filling seat fixedly connected to the filling support column, the lower end of the powder filling seat is fixedly connected to a powder cover, a feed port is opened on one side of the powder cover, the feed port is connected to the powder feeding screw mechanism, the lower end of the powder cover is fixedly connected to two powder hoppers, and the lower end of the powder hopper is a powder nozzle;

[0009] The powder filling seat is rotatably connected to two main shaft sleeves, the interiors of the two main shaft sleeves are rotatably connected to a vertically arranged central shaft, the lower ends of the two main shaft sleeves are fixedly connected to stirring blades located inside the powder cover, and the lower ends of the main shaft sleeves are fixedly connected to a powder pushing screw, and the lower end of the powder pushing screw is located inside the powder nozzle;

[0010] The filling power mechanism includes a stirring motor and two first servo motors fixedly connected to the upper side of the powder filling seat. The output ends of the two first servo motors are respectively fixedly connected to the two central shafts. The output end of the stirring motor is fixedly connected to a driving wheel, and the outer side of the main shaft sleeve is fixedly connected to a driven wheel. The driving wheel and the driven wheel are transmission connected.

[0011] Furthermore, an outer cover covering the outside of the stirring motor and the first servo motor is fixedly connected to the upper side of the powder filling seat.

[0012] Furthermore, the lower end of the powder filling seat is fixedly connected to two connecting rods, the outer sides of the two connecting rods are sleeved with a support plate located on the lower side of the powder cover, and a connecting handle is installed at the lower end of the connecting rod and on the lower side of the support plate, and the powder hopper is fixedly connected to the lower side of the support plate;

[0013] The upper end of the powder pushing spiral rod is clamped in the interior of the locking screw, and the lower end of the outer side of the central shaft is threadedly connected with the locking screw.

[0014] Furthermore, a powder nozzle cover is sleeved on the outer side of the lower end of the powder hopper, and a locking screw is threadedly connected to the outer side of the powder nozzle cover.

[0015] Furthermore, the powder feeding screw mechanism includes a base body fixedly connected to the upper end of the powder feeding support column, the upper end of the base body is fixedly connected to a powder feeding pipe, the upper end of the powder feeding pipe is fixedly connected to a powder lower port, one end of the powder lower port is connected to the feed port, and the powder feeding screw is rotatably connected to the inside of the powder feeding pipe;

[0016] One end of the powder feeding screw extends to the end of the powder feeding pipe away from the screw filling mechanism and is fixedly connected to a driving pulley, the interior of the base body is fixedly connected to a second servo motor, the output end of the second servo motor extends to the outside of the base body and is fixedly connected to a driven pulley, and a transmission belt is installed on the outside of the driving pulley and the driven pulley.

[0017] Furthermore, a pulley cover covering the outside of the driving pulley and the driven pulley is fixedly connected to the outside of the base body.

[0018] Furthermore, the lifter includes a worm gear reducer and a lifting motor connected to the worm gear reducer. The upper end of the worm gear reducer is fixedly connected to a vertical plate, the front end of the vertical plate is vertically slidably connected to a sliding platform, the lifting beam is fixedly connected to the sliding platform, and the front end of the vertical plate also rotates a vertically arranged screw body, the screw body is threadedly connected to the sliding platform, and the screw body is connected to the worm gear reducer.

[0019] Furthermore, the worm gear reducer is also connected to a hand crank shaft, one end of the hand crank shaft away from the worm gear reducer is fixedly connected to a hand wheel, and the outer side of the hand crank shaft is rotatably connected to a small bracket.

[0020] The technical effects achieved by this utility model are:

[0021] The powder filling mechanism of the utility model completes the synchronous lifting and lowering of the screw filling mechanism and the powder feeding screw mechanism through the lifter, completes the conveying of raw materials through the screw filling mechanism and the raw material barrel, and completes the filling through the screw filling mechanism, which can provide a high-efficiency filling mechanism, reduce manpower, and reduce the production cost of food and medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is a cutaway side view of the screw filling mechanism of the utility model;

[0024] Figure 3 It is a cutaway side view of the screw filling mechanism of the utility model from another perspective;

[0025] Figure 4 This utility model Figure 3 A partial enlarged view of point A in the middle;

[0026] Figure 5 This is a top view of the structure of the screw filling mechanism of the utility model;

[0027] Figure 6 This is a top view of the structure of the powder feeding screw mechanism of the utility model;

[0028] Figure 7 It is a sectional side view of the powder feeding screw mechanism of the utility model;

[0029] Figure 8 This is a front view of the structure of the lifter of the utility model;

[0030] Figure 9 It is a structural side view of the lifter of the utility model.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 1. Raw material barrel; 2. Filling support column; 3. Powder feeding support column; 4. Lifter; 401. Worm gear reducer; 402. Vertical plate; 403. Sliding platform; 404. Screw body; 405. Hand crank shaft; 406. Small bracket; 407. Hand wheel; 5. Lifting motor; 6. Lifting beam; 7. Filling power mechanism; 701. Outer cover; 702. Stirring motor; 703. First servo motor; 8. Screw filling mechanism; 801. Powder filling seat; 802. Powder nozzle; 803. Locking screw; 804. Support plate; 805. Driving wheel; 806. Driven wheel; 80 7. Powder cover; 808. Powder hopper; 809. Feed port; 810. Main shaft sleeve; 811. Stirring blade; 812. Center shaft; 813. Powder pushing screw; 814. Powder nozzle cover; 815. Locking screw; 816. Connecting rod; 817. Connecting handle; 818. Powder level sensor; 9. Powder feeding screw mechanism; 901. Base body; 902. Powder feeding pipe; 903. Powder lower port; 904. Powder feeding screw; 905. Driving pulley; 906. Driven pulley; 907. Second servo motor; 908. Pulley cover; 10. Powder feeding swing arm; 11. Butterfly valve. DETAILED DESCRIPTION

[0033] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0034] like Figure 1-9 As shown, a powder filling mechanism includes a lifter 4 and a lifting motor 5 connected to the lifter 4. The lifting motor 5 inputs kinetic energy to the lifter 4. The lifter 4 is equipped with a lifting beam 6. The lifting beam 6 is fixedly connected to the vertically arranged filling support column 2 and the powder feeding support column 3. The lifter 4 drives the lifting beam 6 to move vertically, which can synchronously drive the filling support column 2 and the powder feeding support column 3 to move vertically together. The upper end of the powder feeding support column 3 is screwed to a powder feeding swing arm 10, and a powder feeding screw mechanism 9 is equipped on the powder feeding swing arm 10. The powder feeding screw mechanism 9 can be driven to move by the movement of the powder feeding support column 3, and the powder feeding swing arm 10 can drive the powder feeding screw mechanism 9 to rotate. A butterfly valve 11 is installed on the powder feeding screw mechanism 9. The upper end of the butterfly valve 11 is fixedly connected to the raw material barrel 1. When the butterfly valve 11 is opened, the raw material inside the raw material barrel 1 can enter the interior of the powder feeding screw mechanism 9 through the butterfly valve 11 to complete the feeding.

[0035] The upper end of the filling support column 2 is fixedly connected with a screw filling mechanism 8, which can be connected with the powder feeding screw mechanism 9, so that the raw materials transported by the powder feeding screw mechanism 9 can enter the interior of the screw filling mechanism 8 and be filled through the screw filling mechanism 8. The upper end of the screw filling mechanism 8 is provided with a filling power mechanism 7, which provides kinetic energy for the screw filling mechanism 8 through the filling power mechanism 7. At this time, since the screw filling mechanism 8 and the powder feeding screw mechanism 9 are both installed on the lifting beam 6, the screw filling mechanism 8 and the powder feeding screw mechanism 9 can be lifted and lowered synchronously. During the installation process, there is no need to consider the height difference error between the screw filling mechanism 8 and the powder feeding screw mechanism 9. The installation and coordination between the two structures is relatively simple, which meets the requirements of aseptic assembly and aseptic loading.

[0036] like Figure 1-3 As shown, the screw filling mechanism 8 includes a powder filling seat 801 fixedly connected to the filling support column 2, and a powder cover 807 is fixedly connected to the lower end of the powder filling seat 801. A feed port 809 is opened on one side of the powder cover 807. The feed port 809 is connected to the powder feeding screw mechanism 9, so that the raw materials inside the powder feeding screw mechanism 9 can enter the interior of the powder cover 807 through the feed port 809. The lower end of the powder cover 807 is fixedly connected to two powder hoppers 808. The lower end of the powder hopper 808 is a powder nozzle 802. When the raw materials enter the powder hopper 808, they can be discharged through the powder nozzle 802.

[0037] Two main shaft sleeves 810 are rotatably connected to the powder filling seat 801, and the interiors of the two main shaft sleeves 810 are rotatably connected to a vertically arranged central shaft 812. The lower ends of the two main shaft sleeves 810 are fixedly connected to a stirring blade 811 located inside the powder cover 807. When the main shaft sleeves 810 rotate, the stirring blades 811 can be driven to revolve, thereby stirring the raw materials inside the powder cover 807. The lower end of the main shaft sleeve 810 is fixedly connected to a powder pushing screw rod 813, and the lower end of the powder pushing screw rod 813 is located inside the powder nozzle part 802. At this time, when the central shaft 812 drives the powder pushing screw rod 813 to rotate, the raw materials at the powder nozzle part 802 can be discharged, thereby reducing the delay in raw material discharge.

[0038] The filling power mechanism 7 includes a stirring motor 702 fixedly connected to the upper side of the powder filling seat 801 and two first servo motors 703. The output ends of the two first servo motors 703 are respectively fixedly connected to the two central shafts 812. By starting the first servo motors 703, the central shaft 812 can be driven to rotate. The output end of the stirring motor 702 is fixedly connected to a driving wheel 805, and the outer side of the main shaft sleeve 810 is fixedly connected to a driven wheel 806. The driving wheel 805 and the driven wheel 806 are transmission-connected. When the stirring motor 702 is started, the driving wheel 805 can be driven to rotate. When the driving wheel 805 rotates, it will drive the main shaft sleeve 810 to rotate through the driven wheel 806, thereby providing transmission for the main shaft sleeve 810.

[0039] Here, the transmission of the driving wheel 805 and the driven wheel 806 can be a meshing transmission or a belt transmission. When the transmission of the driving wheel 805 and the driven wheel 806 is a meshing transmission, the driving wheel 805 and the driven wheel 806 are meshing gears connected in a meshing manner. When the transmission of the driving wheel 805 and the driven wheel 806 is a belt transmission, the driving wheel 805 and the driven wheel 806 are pulleys, and a transmission belt is installed on the outside of the two pulleys.

[0040] At the same time, an outer cover 701 is fixedly connected to the upper side of the powder filling seat 801 and covers the outside of the stirring motor 702 and the first servo motor 703 for protecting the stirring motor 702 and the first servo motor 703 .

[0041] A powder level sensor 818 is fixedly connected to the powder cover 807. The powder level sensor 818 is used to monitor the height of the raw materials inside the powder cover 807. After being linked with the stirring motor 702 and the first servo motor 703, the powder level sensor 818 can realize automatic powder feeding and automatic start and stop speed regulation.

[0042] like Figure 2-3 As shown, the installation method of the powder cover 807, the powder hopper 808 and the powder pushing spiral rod 813 is disclosed herein. Specifically, the lower end of the powder filling seat 801 is fixedly connected to two connecting rods 816, and the outer sides of the two connecting rods 816 are sleeved with the support plate 804 located on the lower side of the powder cover 807. The lower end of the connecting rod 816 and the lower side of the support plate 804 are installed with a connecting handle 817. At this time, the powder cover 807 is pushed upward by the connecting rod 816 and the connecting handle 817, so that the powder cover 807 can be clamped between the powder filling seat 801 and the support plate 804, completing the positioning of the powder cover 807. The powder hopper 808 is fixedly connected to the lower side of the support plate 804. At this time, by disassembling the powder cover 807 and the powder hopper 808, the workpiece inside the powder cover 807 can be disassembled and repaired;

[0043] Similarly, the upper end of the powder pushing spiral rod 813 is clamped in the inside of the locking screw 815, and the lower end of the outer side of the central shaft 812 is threadedly connected with a locking screw 803. The powder pushing spiral rod 813 can be locked by the locking screw 803. When the powder cover 807 is removed, the powder pushing spiral rod 813 can be disassembled and repaired simply and conveniently.

[0044] like Figure 4 As shown, a powder nozzle cover 814 is sleeved on the outer side of the lower end of the powder hopper 808, and a locking screw 815 is threadedly connected to the outer side of the powder nozzle cover 814. The powder nozzle cover 814 can be locked to the lower end of the powder hopper 808 by the locking screw 815, thereby sealing the lower end opening of the powder hopper 808.

[0045] Among them, Figure 1 and Figure 6-7As shown, the powder feeding screw mechanism 9 includes a base body 901 fixedly connected to the upper end of the powder feeding support column 3, the upper end of the base body 901 is fixedly connected to a powder feeding tube 902, the upper end of the powder feeding tube 902 is fixedly connected to a powder lower port 903, one end of the powder lower port 903 is connected to the feed port 809, the raw material inside the raw material barrel 1 enters the interior of the powder feeding tube 902 through the powder lower port 903, the interior of the powder feeding tube 902 is rotatably connected to a powder feeding screw rod 904, and when the powder feeding screw rod 904 rotates, the raw material inside the powder feeding tube 902 can be pushed;

[0046] In order to transmit kinetic energy to the powder feeding screw 904, one end of the powder feeding screw 904 extends to the end of the powder feeding tube 902 away from the screw filling mechanism 8 and is fixedly connected to a driving pulley 905. The interior of the base body 901 is fixedly connected to a second servo motor 907. The output end of the second servo motor 907 extends to the outside of the base body 901 and is fixedly connected to a driven pulley 906. A transmission belt is installed on the outside of the driving pulley 905 and the driven pulley 906, thereby completing the transmission of the driving pulley 905 and the driven pulley 906, driving the powder feeding screw 904 to rotate, and the outside of the base body 901 is fixedly connected to a pulley cover 908 covering the outside of the driving pulley 905 and the driven pulley 906 to protect the driving pulley 905 and the driven pulley 906.

[0047] like Figure 1 and Figure 8-9 As shown, the lifter 4 includes a worm gear reducer 401 and a lifting motor 5 connected to the worm gear reducer 401. The upper end of the worm gear reducer 401 is fixedly connected to a vertical plate 402. The front end of the vertical plate 402 is vertically slidably connected to a sliding platform 403. The lifting beam 6 is fixedly connected to the sliding platform 403. The front end of the vertical plate 402 also rotates a vertically arranged screw body 404. The screw body 404 and the sliding platform 403 are threadedly connected. When the screw body 404 rotates, it can drive the sliding platform 403 to rise and fall, thereby completing the adjustment of the height of the lifting beam 6, and after the adjustment is completed, the height of the sliding platform 403 can be locked. The screw body 404 is connected to the worm gear reducer 401 to complete the transmission.

[0048] The worm gear reducer 401 is also connected to a hand-cranked shaft 405, and the end of the hand-cranked shaft 405 away from the worm gear reducer 401 is fixedly connected to a handwheel 407, and the outer side of the hand-cranked shaft 405 is rotatably connected to a small bracket 406. At this time, the worm gear reducer 401 can be transmitted through the hand-cranked shaft 405 by rotating the handwheel 407, so that the dual design of electric lifting and manual lifting can keep the two mechanisms at the same height, thereby improving the installation adjustment time, and the stability of the hand-cranked shaft 405 can be improved through the small bracket 406.

[0049] The working principle of the present utility model is as follows: the lifter 4 is driven by the lifting motor 5 to move, and the lifter 4 drives the lifting beam 6 to move vertically, so that the screw filling mechanism 8 and the powder feeding screw mechanism 9 are lifted and lowered synchronously by the filling support column 2 and the powder feeding support column 3. When the powder feeding screw mechanism 9 is started, the raw materials inside the raw material barrel 1 can be pushed into the screw filling mechanism 8 for stirring and mixing, and filling is carried out after the stirring is completed.

[0050] In summary, this technical solution completes the synchronous lifting of the screw filling mechanism 8 and the powder feeding screw mechanism 9 through the lifter 4, completes the transportation of raw materials through the screw filling mechanism 8 and the raw material barrel 1, and completes the filling through the screw filling mechanism 8, which can provide a high-efficiency filling mechanism, reduce manpower, and reduce the production cost of food and medicine. In addition, during the filling process, the raw materials have less contact with the outside world and are not easily contaminated, thereby ensuring the quality of the product.

[0051] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A powder filling mechanism, characterized in that: The invention comprises a lifter (4) and a lift motor (5) connected to the lifter (4); the lifter (4) is equipped with a lift beam (6); a vertically arranged filling support column (2) and a powder feeding support column (3) are fixedly connected to the lift beam (6); the upper end of the powder feeding support column (3) is screwed to a powder feeding swing arm (10); the powder feeding swing arm (10) is equipped with a powder feeding screw mechanism (9); a butterfly valve (11) is installed on the powder feeding screw mechanism (9); the upper end of the butterfly valve (11) is fixedly connected to a raw material barrel (1); The upper end of the filling support column (2) is fixedly connected to a screw filling mechanism (8), the screw filling mechanism (8) is connected to a powder feeding screw mechanism (9), and the upper end of the screw filling mechanism (8) is installed with a filling power mechanism (7).

2. A powder filling mechanism according to claim 1, characterized in that: The screw filling mechanism (8) includes a powder filling seat (801) fixedly connected to the filling support column (2), a powder cover (807) fixedly connected to the lower end of the powder filling seat (801), a feed port (809) is provided on one side of the powder cover (807), the feed port (809) is connected to the powder feeding screw mechanism (9), and two powder hoppers (808) are fixedly connected to the lower end of the powder cover (807), and the lower end of the powder hopper (808) is a powder nozzle (802); The powder filling seat (801) is rotatably connected to two main shaft sleeves (810), the interiors of the two main shaft sleeves (810) are rotatably connected to a vertically arranged central shaft (812), the lower ends of the two main shaft sleeves (810) are fixedly connected to a stirring blade (811) located inside a powder cover (807), the lower ends of the main shaft sleeves (810) are fixedly connected to a powder pushing screw (813), and the lower end of the powder pushing screw (813) is located inside the powder nozzle (802); The filling power mechanism (7) includes a stirring motor (702) fixedly connected to the upper side of the powder filling seat (801) and two first servo motors (703), the output ends of the two first servo motors (703) are respectively fixedly connected to two central shafts (812), the output end of the stirring motor (702) is fixedly connected to a driving wheel (805), the outer side of the main shaft sleeve (810) is fixedly connected to a driven wheel (806), and the driving wheel (805) and the driven wheel (806) are transmission-connected.

3. A powder filling mechanism according to claim 2, characterized in that: An outer cover (701) is fixedly connected to the upper side of the powder filling seat (801) and covers the outside of the stirring motor (702) and the first servo motor (703).

4. A powder filling mechanism according to claim 2, characterized in that: The lower end of the powder filling seat (801) is fixedly connected to two connecting rods (816), the outer sides of the two connecting rods (816) are sleeved with a support plate (804) located on the lower side of the powder cover (807), and a connecting handle (817) is installed at the lower end of the connecting rod (816) and located on the lower side of the support plate (804), and the powder hopper (808) is fixedly connected to the lower side of the support plate (804); The upper end of the powder pushing spiral rod (813) is clamped inside the locking screw (815), and the lower end of the outer side of the central shaft (812) is threadedly connected to the locking screw (803).

5. A powder filling mechanism according to claim 2, characterized in that: A powder nozzle cover (814) is sleeved on the outer side of the lower end of the powder hopper (808), and a locking screw (815) is threadedly connected to the outer side of the powder nozzle cover (814).

6. A powder filling mechanism according to claim 2, characterized in that: The powder feeding screw mechanism (9) comprises a base body (901) fixedly connected to the upper end of the powder feeding support column (3); the upper end of the base body (901) is fixedly connected to a powder feeding pipe (902); the upper end of the powder feeding pipe (902) is fixedly connected to a powder lower opening (903); one end of the powder lower opening (903) is connected to a feed opening (809); and the interior of the powder feeding pipe (902) is rotatably connected to a powder feeding screw rod (904); One end of the powder feeding screw (904) extends to the end of the powder feeding pipe (902) away from the screw filling mechanism (8) and is fixedly connected to a driving pulley (905); the interior of the base body (901) is fixedly connected to a second servo motor (907); the output end of the second servo motor (907) extends to the outside of the base body (901) and is fixedly connected to a driven pulley (906); and transmission belts are installed on the outsides of the driving pulley (905) and the driven pulley (906).

7. A powder filling mechanism according to claim 6, characterized in that: The outer side of the base body (901) is fixedly connected to a pulley cover (908) covering the outer sides of the driving pulley (905) and the driven pulley (906).

8. The powder filling mechanism according to claim 1, characterized in that: The lifter (4) includes a worm gear reducer (401) and a lifting motor (5) connected to the worm gear reducer (401); the upper end of the worm gear reducer (401) is fixedly connected to a vertical plate (402); the front end of the vertical plate (402) is vertically slidably connected to a sliding platform (403); the lifting beam (6) is fixedly connected to the sliding platform (403); the front end of the vertical plate (402) also rotates a vertically arranged screw body (404); the screw body (404) and the sliding platform (403) are threadedly connected, and the screw body (404) is connected to the worm gear reducer (401).

9. A powder filling mechanism according to claim 8, characterized in that: The worm gear reducer (401) is further connected to a hand crank shaft (405), one end of the hand crank shaft (405) away from the worm gear reducer (401) is fixedly connected to a hand wheel (407), and the outer side of the hand crank shaft (405) is rotatably connected to a small bracket (406).

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