Rapid freezing device for production of prefabricated dishes

Abstract

The utility model discloses a quick freezing device for producing prefabricated vegetables, and relates to the technical field of prefabricated vegetable processing. The device comprises a liquid nitrogen freezing cabinet, a liquid nitrogen tank, a cabinet door, a convenient dish taking and placing trolley, a climbing auxiliary assembly and a sealing assembly, a fan for assisting cold air to be diffused to the surfaces of prefabricated dishes is arranged at the top of the liquid nitrogen freezing cabinet, and an annular pipe is fixed to the inner wall of the liquid nitrogen freezing cabinet through a pipe hoop; according to the liquid nitrogen cabinet freezer, due to the arrangement of the convenient dish taking and placing trolley for placing the prefabricated dishes, a user can place all the dishes in the placing frame at a time and then push the dishes into the liquid nitrogen cabinet freezer together, the convenience is improved, and meanwhile the situation that the weight is increased after all the dishes are placed in the placing frame is considered; in order to solve the problem that it is difficult to push the prefabricated vegetables into liquid nitrogen freezing, a climbing auxiliary assembly is designed and drives an anti-skid sleeve to make contact with self-locking universal wheels at the bottom of a frame through a rotating sleeve, and auxiliary force is provided.

Description

Technical Field

[0001] The utility model belongs to the field of pre-prepared food processing, and in particular relates to a quick freezing device for the production of pre-prepared food. Background Art

[0002] Pre-prepared dishes are prepared and then quickly frozen or vacuum-preserved. When used, they only need to be heated for consumption. Due to their convenient and efficient use, some existing restaurants and fast food restaurants use pre-prepared dishes to increase the speed of serving meals and save labor costs. When using a liquid nitrogen quick-freezing cabinet to quickly freeze the pre-prepared dishes, since the volume of the liquid nitrogen quick-freezing cabinet is fixed, in the process of batch processing of a large number of pre-prepared dishes, it is necessary to repeatedly load and unload materials into the liquid nitrogen quick-freezing cabinet, resulting in limited processing efficiency. In view of this problem, a rapid freezing device for pre-prepared dish production can be proposed to achieve the effect of continuous rapid freezing of a large number of pre-prepared dishes. In addition, the cold air holes of most existing freezers are on the side, so that during the blowing process, the cold air has a large contact area with the side wall of the pre-prepared dish plate, but a small contact area with the pre-prepared dish. In view of this, the present utility model is specially proposed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rapid freezing device for the production of pre-prepared dishes.

[0004] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0005] A rapid freezing device for preparing food, comprising a liquid nitrogen freezer, a liquid nitrogen tank, a cabinet door, a convenient cart for taking and placing food, a climbing auxiliary component and a sealing component. A fan is provided on the top of the liquid nitrogen freezer to help cool air diffuse to the surface of the prepared food. An annular tube is fixed to the inner wall of the liquid nitrogen freezer through a pipe clamp. The annular tube passes through the liquid nitrogen freezer and a storage rack through an air guide pipe and is connected to a liquid nitrogen storage tank in the middle of the storage rack. A control valve is provided in the middle of the air guide pipe, and a plurality of nozzles are provided on the inner side of the annular tube.

[0006] The front lower side of the liquid nitrogen freezer is provided with an embedding groove for installing a climbing auxiliary component, and the climbing auxiliary component is used to help the convenient dish picking and placing vehicle enter the liquid nitrogen freezer. The convenient dish picking and placing vehicle comprises a frame, a rotating shaft, a hexagonal kit, a placement frame, a mesh plate and a chassis, and self-locking universal wheels are provided at the four bottom corners of the frame, and a rotating shaft is provided in the middle of the frame, one end of the rotating shaft is rotatably connected to the frame through a bearing, and the other end of the rotating shaft is rotatably connected to the output shaft of the reduction motor, and the reduction motor is fixedly mounted on the outside of the frame, and hexagonal kits are sleeved on both sides of the outside of the rotating shaft, and fixing rings are integrally formed at the front and rear ends of the hexagonal kit, and the fixing rings are fixed to the rotating shaft by screws, and the opposite surfaces of each pair of rods of the two hexagonal kits are rotatably connected to the connecting rods of the same placement frame through bearings, and the connecting rods are symmetrically fixed on both sides of the placement frame;

[0007] A square groove for fixing the mesh plate is provided in the middle of the placement frame, and anti-falling plates are fixed on both the front and rear sides of the middle of the placement frame. The side of the liquid nitrogen freezer is rotatably connected with a cabinet door through a hinge.

[0008] Optionally, a sealing assembly is fixed on the contact surface between the cabinet door and the liquid nitrogen freezer, and the sealing assembly includes a telescopic pleated strip, a support plate, a reset spring, an adsorption strip and a magnetic sheet. The interior of the telescopic pleated strip is provided with a cavity for placing two support plates, a reset spring is provided between the two support plates, and an adsorption strip is fixedly installed on the bottom of the telescopic pleated strip, and a magnetic sheet for magnetically adsorbing the surface of the liquid nitrogen freezer shell is provided inside the adsorption strip.

[0009] Optionally, two fill-in lights are fixedly installed inside the liquid nitrogen freezer, and the two fill-in lights are connected to a human infrared sensing switch circuit on one side of the inside of the liquid nitrogen freezer through a wire.

[0010] Optionally, an L-shaped block is fixed to the outside of the shell of the liquid nitrogen freezer, and a limiting strip for resisting the cabinet door is hinged at the front end of one side of the L-shaped block.

[0011] Optionally, an electronic timer for timing freezing time is fixed on the outer surface of the cabinet door.

[0012] Optionally, the climbing auxiliary component includes a wedge-shaped seat, a shaft body, a sleeve, a sprocket, a chain, a cover plate and a plug-in plate, the front end of the wedge-shaped seat is fixed with a cover plate by screws, a plurality of reserved holes for the installation of the shaft body are opened between the cover plate and the wedge-shaped seat, the shaft body is installed in the inside of the reserved hole through a bearing, a sleeve is fixed and adjusted on the outside of each shaft body, a non-slip rubber sleeve is sleeved on the outside of the sleeve, and a sprocket for the installation of the chain is fixed on the front end of each sleeve, a driving motor is fixedly installed on the front end of the cover plate, the output shaft of the driving motor is fixedly connected to the front end of one of the shaft bodies through a coupling, a makeshift groove for exposing a plurality of sleeves is opened at the upper end of the wedge-shaped seat, a plug-in plate for plugging into the embedded groove is fixed on the outside of the wedge seat, and the plug-in plate and the embedded groove are fixed by a limit bolt.

[0013] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art. Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described below at the same time:

[0014] The utility model provides a convenient dish retrieval and placement cart for placing pre-prepared dishes, so that the user can place all the dishes in the placement frame at one time and then push them into the liquid nitrogen freezer at the same time, thereby improving convenience. At the same time, considering that the weight of the dishes will increase after all the dishes are placed in the placement frame, which makes it difficult to push the pre-prepared dishes into the liquid nitrogen freezer, a climbing auxiliary component is designed, which uses a rotating sleeve to drive the anti-slip sleeve to contact the self-locking universal wheel at the bottom of the frame to provide auxiliary force, thereby reducing the force required for the user to push the cart into the liquid nitrogen freezer, and the multiple placement frames inside the frame can be driven by the reduction motor to rotate the rotating shaft, so that the pre-prepared dishes in each placement frame can be fully in contact with the liquid nitrogen delivered by the nozzle, thereby avoiding the existing The liquid nitrogen is conveyed in the side direction, so that most of the liquid nitrogen gas contacts the dish after being conveyed by wind, and does not contact the dish directly, which prolongs the freezing time. The liquid nitrogen and cold air outlets of the device can contact the dish directly, and the rotatable structure is used to reduce the freezing time required for the dish, thereby improving the freezing efficiency. Finally, considering the sealing between the cabinet door and the liquid nitrogen freezer, a sealing component is used for double sealing, that is, the magnetic sheet inside the adsorption strip will be adsorbed to the surface of the liquid nitrogen freezer for the first sealing, and then the limit strip is used to make the cabinet door contact with the liquid nitrogen freezer, and the reset spring will contact the two support plates to make the telescopic pleated strip expand, thereby ensuring that the gap between the cabinet door and the liquid nitrogen freezer is blocked by the expanded telescopic pleated strip to prevent the escape of cold air.

[0015] The specific implementation modes of the present utility model are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] In the figure:

[0018] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0019] Figure 2 It is a structural diagram of the combined parts of the wedge-shaped seat, the clearance groove and the sleeve in the utility model;

[0020] Figure 3 It is a structural diagram of the combined parts of the wedge-shaped seat, the cover plate and the plug-in plate in the utility model;

[0021] Figure 4 This is a structural diagram of the combined parts of the cabinet door, telescopic pleated strip and adsorption strip in the utility model;

[0022] Figure 5 This is a structural diagram of the combined parts of the hexagonal kit and the fixing ring in the utility model;

[0023] Figure 6 This is a structural diagram of the combined parts of the cabinet door and the electronic timer in the utility model;

[0024] Figure 7 It is a structural diagram of the combined parts of the placement frame, the connecting rod and the mesh plate in the utility model;

[0025] Figure 8 for Figure 1 Schematic diagram of the structure of the A part;

[0026] Fig. 9 for Figure 1 Schematic diagram of the structure of part B.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Liquid nitrogen freezer; 2. Fan; 3. Ring tube; 4. Storage rack; 5. Liquid nitrogen storage tank; 6. Air duct; 7. Control valve; 8. Nozzle; 9. Embedded slot; 10. Frame; 11. Self-locking universal wheel; 12. Rotating shaft; 13. Reducer motor; 14. Hexagonal kit; 15. Fixed ring; 16. Placement frame; 17. Connecting rod; 18. Mesh plate; 19. Anti-fall plate; 20. Hinge; 21. Cabinet door; 22. Telescopic folds 1. The first step is to install the gear train of the motor vehicle, ...

[0029] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] The utility model is now described in further detail with reference to the accompanying drawings.

[0031] See also Figures 1 to 9 The utility model provides a technical solution: a rapid freezing device for preparing dishes, comprising a liquid nitrogen freezer 1, a liquid nitrogen tank, a cabinet door 21, a convenient cart for taking dishes, a climbing auxiliary component and a sealing component. A fan 2 is provided on the top of the liquid nitrogen freezer 1 to help the cold air diffuse to the surface of the prepared dishes. An annular tube 3 is fixed to the inner wall of the liquid nitrogen freezer 1 through a pipe hoop. The annular tube 3 passes through the liquid nitrogen freezer 1 and a storage rack 4 through an air guide pipe 6 and is connected to a liquid nitrogen storage tank 5 in the middle of the storage rack 4. A control valve 7 is provided in the middle of the air guide pipe 6. A plurality of nozzles 8 are provided on the inner side of the annular tube 3.

[0032] The lower front end of the liquid nitrogen freezer 1 is provided with an embedding groove 9 for installing a climbing auxiliary component. The climbing auxiliary component is used to help the convenient dish pick-up and put-in vehicle enter the liquid nitrogen freezer 1. The convenient dish pick-up and put-in vehicle includes a frame 10, a rotating shaft 12, a hexagonal kit 14, a placement frame 16, a mesh plate 18 and a chassis. The bottom four corners of the frame 10 are provided with self-locking universal wheels 11, and a rotating shaft 12 is provided in the middle of the frame 10. One end of the rotating shaft 12 is rotatably connected to the frame 10 through a bearing. The rotating shaft 1 The other end of the rotating shaft 12 is rotatably connected to the output shaft of the reduction motor 13, and the reduction motor 13 is fixedly installed on the outer side of the frame 10. The outer sides of the rotating shaft 12 are sleeved with hexagonal sets 14, and the front and rear ends of the hexagonal sets 14 are integrally formed with fixing rings 15, and the fixing rings 15 are fixed to the rotating shaft 12 by screws. The opposite surfaces of each pair of rods of the two hexagonal sets 14 are rotatably connected to the connecting rods 17 of the same placing frame 16 through bearings, and the connecting rods 17 are symmetrically fixed on both sides of the placing frame 16;

[0033] A square groove for fixing the mesh plate 18 is provided in the middle of the placement frame 16, and anti-falling plates 19 are fixed on both sides of the middle of the placement frame 16. The side of the liquid nitrogen freezer 1 is rotatably connected with a cabinet door 21 through a hinge 20. Considering that when using a liquid nitrogen quick-freezing cabinet to quick-freeze pre-prepared dishes, since the volume of the liquid nitrogen quick-freezing cabinet is fixed, in the process of batch processing of a large number of pre-prepared dishes, it is necessary to repeatedly load and unload materials into the liquid nitrogen quick-freezing cabinet, resulting in limited processing efficiency. In view of this problem, a rapid freezing device for pre-prepared dish production can be proposed to achieve the effect of continuous quick-freezing of a large number of pre-prepared dishes. Moreover, the cold air holes of most existing freezers are on the side, so that during the blowing process, the cold air has a large contact area with the side wall of the pre-prepared dish plate, but a small contact area with the pre-prepared dish. The utility model provides a convenient dish retrieval cart for placing pre-prepared dishes, so that the user can place all the dishes in the placement frame 16 at one time and then push them into the liquid nitrogen freezer 1 at the same time, thereby improving convenience. At the same time, considering that the weight of the dishes will increase after all the dishes are placed in the placement frame 16, and it is difficult to push the pre-prepared dishes into the liquid nitrogen freezer, a climbing auxiliary component is designed, which uses the rotating sleeve 35 to drive the anti-skid The sleeve contacts the self-locking universal wheel 11 at the bottom of the frame 10 to provide auxiliary force, thereby reducing the force required by the user to push the trolley into the liquid nitrogen freezer 1, and the multiple placement frames 16 inside the frame 10 can drive the rotating shaft 12 to rotate through the reduction motor 13, so that the pre-prepared dishes inside each placement frame 16 can be fully in contact with the liquid nitrogen delivered by the nozzle 8, avoiding the existing liquid nitrogen delivery direction at the side so that most of the liquid nitrogen gas is delivered by wind to contact the dish, and does not directly contact the dish, prolonging the freezing time, while the liquid nitrogen and cold air outlets of the device can directly contact the dish, By utilizing the rotatable structure, the freezing time required for the dishes is reduced and the freezing efficiency is improved. Finally, considering the sealing between the cabinet door 21 and the liquid nitrogen freezer, a sealing component is used for double sealing, that is, the magnetic sheet 26 inside the adsorption strip 25 will be adsorbed to the surface of the liquid nitrogen freezer 1 for the first sealing, and then the limit strip 30 is used to make the cabinet door 21 contact with the liquid nitrogen freezer 1, and the return spring 24 will contact the two support plates 23, so that the telescopic pleated strip 22 is expanded, thereby ensuring that the gap between the cabinet door 21 and the liquid nitrogen freezer 1 is blocked by the expanded telescopic pleated strip 22 to prevent the escape of cold air.

[0034] Among them, a sealing component is fixed on the contact surface between the cabinet door 21 and the liquid nitrogen freezer 1, and the sealing component includes a telescopic pleated strip 22, a support plate 23, a reset spring 24, an adsorption strip 25 and a magnetic sheet 26. The interior of the telescopic pleated strip 22 is provided with a cavity for placing two support plates 23, a reset spring 24 is provided between the two support plates 23, and an adsorption strip 25 is fixedly installed at the bottom of the telescopic pleated strip 22. A magnetic sheet 26 for magnetically adsorbing the shell surface of the liquid nitrogen freezer 1 is provided inside the adsorption strip 25. By setting the sealing component, the cabinet door 21 and the liquid nitrogen freezer 1 are sealed. The gap when closed plays a sealing role. The rubber and traditional sealing strips are used to improve the sealing effect. The component can be used for double sealing, that is, the magnetic sheet 26 inside the adsorption strip 25 will be adsorbed with the surface of the liquid nitrogen freezer 1 for the first sealing. Secondly, the limit strip 30 is used to make the cabinet door 21 contact with the liquid nitrogen freezer 1. The return spring 24 will contact the two support plates 23, so that the telescopic pleated strip 22 is expanded, thereby ensuring that the gap between the cabinet door 21 and the liquid nitrogen freezer 1 is blocked by the expanded telescopic pleated strip 22 to prevent cold air from escaping.

[0035] Among them, two fill lights 27 are fixedly installed inside the liquid nitrogen freezer 1, and the two fill lights 27 are connected to the human infrared sensing switch 28 circuit on one side of the inside of the liquid nitrogen freezer 1 through wires. Considering that the user needs to penetrate the frame 10 when pushing the dish retrieval and placement convenience cart to avoid scratches between the frame 10 and the inner wall of the liquid nitrogen freezer 1, the above structure is designed. When the cabinet door 21 is opened, the user is captured by the infrared sensing area of ​​the human infrared sensing switch 28, and then the fill light 27 will light up to help the user see the internal situation of the liquid nitrogen freezer 1 and avoid scratches on the frame 10.

[0036] Among them, an L-shaped block 29 is fixed to the outside of the shell of the liquid nitrogen freezer 1, and a limit bar 30 for contacting the cabinet door 21 is hinged at the front end of one side of the L-shaped block 29. The cabinet door 21 is closed by setting the limit bar 30. When closing the cabinet door 21, the cabinet door 21 is closed, and then the limit bar 30 hinged on the L-shaped block 29 is rotated to fix it by contacting the limit bar 30 with the surface of the cabinet door 21.

[0037] Among them, an electronic timer 31 for timing the freezing time is fixed on the outer surface of the cabinet door 21. Taking into account the freezing time required for different dishes, the use of the electronic timer 31 can effectively help the user grasp the freezing time required for the pre-prepared dishes.

[0038] The climbing auxiliary component includes a wedge-shaped seat 32, a shaft body 34, a sleeve 35, a sprocket 38, a chain 37, a cover plate 33 and a plug-in plate 41. The front end of the wedge-shaped seat 32 is fixed with a cover plate 33 by screws. A plurality of reserved holes for the installation of the shaft body 34 are provided between the cover plate 33 and the wedge-shaped seat 32. The shaft body 34 is installed inside the reserved holes through bearings. A sleeve 35 is fixed and adjusted on the outside of each shaft body 34. An anti-slip rubber sleeve 36 is sleeved on the outside of the sleeve 35. A sprocket 38 for the installation of the chain 37 is fixed on the front end of each sleeve 35. A drive motor 39 is fixedly installed at the front end of the cover plate 33. The output shaft of the drive motor 39 is connected to one of the shaft bodies through a coupling. The front end of 34 is fixedly connected, and a makeshift groove 40 for exposing multiple sleeves 35 is opened at the upper end of the wedge-shaped seat 32. A plug-in plate 41 for plugging into the embedding groove 9 is fixed on the outer side of the wedge-shaped seat 32, and the plug-in plate 41 and the embedding groove 9 are fixed by a limit bolt 42. By setting the climbing auxiliary component, it helps the user who pushes the frame 10. When more dishes are placed, the weight of the frame 10 becomes heavier, and it is more difficult for the user to push it. This component will drive one of the rotating shafts to rotate through the reduction motor 13. At this time, the sprocket 38 outside the sleeve 35 will cooperate with the chain 37 to drive multiple sleeves 35 to rotate synchronously, thereby helping the user to provide power assistance.

[0039] The present invention is not limited to the above-mentioned implementation modes. Anyone should be aware of the structural changes made under the inspiration of the present invention. Any technical solution that is the same or similar to the present invention falls within the protection scope of the present invention. The technology, shape, and structure that are not described in detail in the present invention are all known technologies.

Claims

1. A rapid freezing device for preparing food, comprising a liquid nitrogen freezer (1), a liquid nitrogen tank, a cabinet door (21), a convenient food pick-up and drop-out vehicle, a climbing auxiliary component and a sealing component, characterized in that: A fan (2) is provided on the top of the liquid nitrogen freezer (1) to help cool air diffuse to the surface of the prepared food. An annular tube (3) is fixed to the inner wall of the liquid nitrogen freezer (1) through a tube clamp. The annular tube (3) passes through the liquid nitrogen freezer (1) and the storage rack (4) through an air guide tube (6) and is connected to a liquid nitrogen storage tank (5) in the middle of the storage rack (4). A control valve (7) is provided in the middle of the air guide tube (6). A plurality of nozzles (8) are provided on the inner side of the annular tube (3); The front lower side of the liquid nitrogen freezer (1) is provided with an embedding groove (9) for installing a climbing auxiliary component, and the climbing auxiliary component is used to help the convenient food pick-up and placement vehicle enter the liquid nitrogen freezer (1). The convenient food pick-up and placement vehicle comprises a vehicle frame (10), a rotating shaft (12), a hexagonal kit (14), a placement frame (16), a mesh plate (18) and a chassis. The four bottom corners of the vehicle frame (10) are provided with self-locking universal wheels (11), and a rotating shaft (12) is provided in the middle of the vehicle frame (10). One end of the rotating shaft (12) is rotatably connected to the vehicle frame (10) through a bearing, and the rotating shaft (12) is rotatably connected to the vehicle frame (10). ) is rotatably connected to the output shaft of the reduction motor (13), the reduction motor (13) is fixedly mounted on the outside of the frame (10), both sides of the outside of the rotation shaft (12) are sleeved with hexagonal sleeves (14), and fixing rings (15) are integrally formed at the front and rear ends of the hexagonal sleeve (14), and the fixing ring (15) is fixed to the rotation shaft (12) by screws, and each pair of opposite rod surfaces of the two hexagonal sleeves (14) are rotatably connected to the connecting rod (17) of the same placement frame (16) through bearings, and the connecting rod (17) is symmetrically fixed on both sides of the placement frame (16); A square groove for fixing a mesh plate (18) is provided in the middle of the placement frame (16), and anti-fall plates (19) are fixed on both the front and rear sides of the middle of the placement frame (16). The side of the liquid nitrogen freezer (1) is rotatably connected to a cabinet door (21) via a hinge (20).

2. The rapid freezing device for preparing prepared dishes according to claim 1, characterized in that: A sealing component is fixed on the contact surface between the cabinet door (21) and the liquid nitrogen freezer (1), and the sealing component comprises a telescopic pleated strip (22), a support plate (23), a reset spring (24), an adsorption strip (25) and a magnetic sheet (26); a cavity for placing two support plates (23) is provided inside the telescopic pleated strip (22), a reset spring (24) is provided between the two support plates (23), an adsorption strip (25) is fixedly installed at the bottom of the telescopic pleated strip (22), and a magnetic sheet (26) for magnetically adsorbing the shell surface of the liquid nitrogen freezer (1) is provided inside the adsorption strip (25).

3. The rapid freezing device for preparing prepared dishes according to claim 1, characterized in that: Two fill-in lights (27) are fixedly installed inside the liquid nitrogen freezing cabinet (1), and the two fill-in lights (27) are connected to a human infrared induction switch (28) circuit on one side inside the liquid nitrogen freezing cabinet (1) through a wire.

4. The rapid freezing device for preparing prepared dishes according to claim 1, characterized in that: An L-shaped block (29) is fixed to the outside of the shell of the liquid nitrogen freezing cabinet (1), and a limiting strip (30) for contacting the cabinet door (21) is hingedly connected to the front end of one side of the L-shaped block (29).

5. The rapid freezing device for preparing prepared dishes according to claim 1, characterized in that: An electronic timer (31) for timing the freezing time is fixed on the outer surface of the cabinet door (21).

6. The rapid freezing device for preparing prepared dishes according to claim 1, characterized in that: The climbing auxiliary component comprises a wedge-shaped seat (32), a shaft (34), a sleeve (35), a sprocket (38), a chain (37), a cover plate (33) and a plug-in plate (41). The front end of the wedge-shaped seat (32) is fixed with the cover plate (33) by screws. A plurality of reserved holes for installing the shaft (34) are provided between the cover plate (33) and the wedge-shaped seat (32). The shaft (34) is installed inside the reserved holes by bearings. A sleeve (35) is fixed and adjusted outside each shaft (34). An anti-slip rubber sleeve (36) is sleeved outside the sleeve (35). A sprocket (38) for mounting a chain (37) is fixed to the front end of each sleeve (35); a driving motor (39) is fixed to the front end of the cover plate (33); an output shaft of the driving motor (39) is fixedly connected to the front end of one of the shaft bodies (34) via a coupling; a clearance groove (40) for exposing a plurality of sleeves (35) is provided at the upper end of the wedge-shaped seat (32); a plug-in plate (41) for plugging into the embedded groove (9) is fixed to the outer side of the wedge-shaped seat (32); and the plug-in plate (41) and the embedded groove (9) are fixed via a limit bolt (42).

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