Heavy-load quick-freezing device

Abstract

The utility model belongs to the technical field of food quick freezing, and discloses a heavy load type quick freezing device which comprises a warehouse room, a bottom plate is arranged on the lower surface of the warehouse room, a heavy load type conveying mechanism is placed in the warehouse room, and a material frame is conveyed on the upper surface of the heavy load type conveying mechanism. Limiting mechanisms for limiting the conveying position of the material frame at the upper end of the heavy-load conveying mechanism are arranged on the left side and the right side of the heavy-load conveying mechanism, a groove is formed in the lower surface of the bottom plate, a positioning mechanism is arranged in the groove of the bottom plate, and a protection mechanism is installed on one side of the bottom plate. The limiting mechanisms are clamped to the left side and the right side of the material frame, so that the follow-up limiting mechanisms limit and position the conveying path of the material frame at the upper end of the heavy-load conveying mechanism, and the situation that the heavy-load conveying mechanism or the material frame is damaged due to the fact that the follow-up material frame collides with the inner wall of the heavy-load conveying mechanism in the conveying process is avoided as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of food quick-freezing, in particular to a heavy-duty quick-freezing device. Background Technique

[0002] In order to achieve long-term and high-quality preservation of materials such as food, people will carry out quick-freezing processing and frozen storage and transportation of food raw materials, so as to reduce the deterioration of food raw materials caused by high temperature, reproduction of spoilage microorganisms, biochemical reactions, etc., thereby promoting the annual supply and long-distance storage and transportation sales across regions of local specialty foods and seasonal specialty foods.

[0003] In the process of implementing this application, it is found that there are the following problems in this technology: during the use of the existing heavy-duty quick-freezing device, the material frame is driven to move by starting the transmission mechanism to achieve rapid freezing of large-packaged materials. However, most heavy-duty transmission mechanisms cannot limit the movement range of the material frame during use, making it easy for the subsequent material frame to deviate during movement, thus reducing the practicability of the device.

[0004] Therefore, a heavy-duty quick-freezing device is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem that during the use of the existing heavy-duty quick-freezing device, the material frame is driven to move by starting the transmission mechanism to achieve rapid freezing of large-packaged materials. However, most heavy-duty transmission mechanisms cannot limit the movement range of the material frame during use, making it easy for the subsequent material frame to deviate during movement. The utility model provides a heavy-duty quick-freezing device.

[0006] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0007] A heavy-duty quick-freezing device includes a storage board room. The lower surface of the storage board room is provided with a bottom board. A heavy-duty transmission mechanism is placed inside the storage board room. A material frame is conveyed on the upper surface of the heavy-duty transmission mechanism. Limiting mechanisms for limiting the conveying position of the material frame at the upper end of the heavy-duty transmission mechanism are arranged on the left and right sides of the heavy-duty transmission mechanism. A groove is opened on the lower surface of the bottom board. A positioning mechanism is arranged inside the groove of the bottom board. A protection mechanism is installed on one side of the bottom board.

[0008] Furthermore, the limiting mechanism includes two groups of connecting rods, which are respectively installed on the inner walls of the left and right sides of the heavy-duty conveying mechanism. The positions of the two groups of connecting rods are both set directly above the conveyor belt inside the heavy-duty conveying mechanism. Card slots are provided on the upper surfaces of the two groups of connecting rods, and L-shaped fixing plates are slidably connected inside the card slots of the two groups of connecting rods. Connecting blocks are arranged on the upper surfaces of the two groups of L-shaped fixing plates. Electric telescopic rods are installed on the adjacent sides of the two groups of connecting blocks. U-shaped positioning plates are installed at the output ends of the two groups of electric telescopic rods. The two groups of U-shaped positioning plates are clamped on the left and right sides of the material box at the upper end of the heavy-duty conveying mechanism.

[0009] Furthermore, through holes are provided on the adjacent sides of the two groups of connecting blocks, and fixing rods are slidably connected inside the through holes of the two groups of connecting blocks. The adjacent ends of the two groups of fixing rods are respectively installed on the opposite sides of the two groups of U-shaped positioning plates.

[0010] Furthermore, the positioning mechanism includes two groups of fixing blocks one and fixing block two. The two groups of fixing blocks one are both installed at the openings on the front and rear sides of the groove of the bottom plate. Through holes are provided on the adjacent sides of the two groups of fixing blocks one, and a bidirectional threaded rod is rotatably connected inside the through holes of the two groups of fixing blocks one. Two groups of sliders are threadedly connected to the outside of the bidirectional threaded rod. The two groups of sliders are both slidably connected inside the groove of the bottom plate. Threaded holes are provided on the lower surfaces of the two groups of sliders, and screws are threadedly connected inside the two groups of sliders. Limiting plates are threadedly connected to the outside of the two groups of screws. A card slot is provided on one side of the bottom plate groove close to the protection mechanism, and fixing block two is installed inside the card slot of the bottom plate. A through hole is provided on the side of fixing block two close to the bottom plate groove, and a rotating rod is installed inside the through hole of fixing block two. A second bevel gear is provided on the side of the rotating rod close to the bidirectional threaded rod. The external teeth of the second bevel gear are meshed and connected with a first bevel gear. The first bevel gear is installed on the outer surface of the bidirectional threaded rod. A handle is installed on the side of the rotating rod far from the second bevel gear.

[0011] Furthermore, anti-slip patterns are provided on the adjacent sides of the two groups of limiting plates.

[0012] Furthermore, the protection mechanism includes two groups of hinges. The two groups of hinges are installed on the side of the bottom plate away from the heavy-duty conveying mechanism. The bottom plate is hinged with a U-shaped fixing plate through the two groups of hinges. A positioning block is installed on the side of the U-shaped fixing plate close to the bottom plate. Two groups of positioning card slots are provided on the side of the bottom plate close to the hinges. The two groups of positioning blocks are respectively clamped inside the two groups of positioning card slots of the bottom plate. The position of the handle is set inside the U-shaped fixing plate.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. The utility model drives two groups of U-shaped positioning plates to adjust and move to the left and right sides of the material box by pulling two groups of L-shaped fixing plates, and then starts two groups of electric telescopic rods to push two groups of U-shaped positioning plates to move, and respectively clamps two groups of U-shaped positioning plates on the left and right sides of the material box at the upper end of the heavy-duty conveying mechanism. And two groups of L-shaped fixing plates are respectively slidably connected inside the clamping grooves of two groups of connecting rods, so that the subsequent material box drives two groups of U-shaped positioning plates to move synchronously during the moving process, and further enables the subsequent limiting mechanism to limit and position the conveying path of the material box at the upper end of the heavy-duty conveying mechanism, thereby minimizing the subsequent impact between the material box and the inner wall of the heavy-duty conveying mechanism during the conveying process, resulting in damage to the heavy-duty conveying mechanism or the material box. Therefore, the stability of the heavy-duty conveying mechanism during the conveying process is improved.

[0015] 2. The utility model drives the rotating rod, the second bevel gear, and the first bevel gear to trigger the bidirectional threaded rod to drive two groups of sliders to slide inside the bottom groove by rotating the handle, and adjusts and moves the adjacent sides of two groups of first bevel gears to the outer surfaces of the left and right sides of the carriage respectively. Then, by rotating two groups of screw rods, two groups of limiting plates are installed at the lower ends of two groups of sliders, so that the adjacent sides of the subsequent two groups of limiting plates respectively abut against the outer surfaces of the left and right sides of the carriage, and further enables the subsequent positioning mechanism to secondarily limit the position of the library board room at the upper end of the carriage, thereby minimizing the subsequent movement of the device during transportation. Therefore, the stability of the device during vehicle transportation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic top view structure of the utility model;

[0017] Figure 2 is a schematic bottom view structure of the utility model;

[0018] Figure 3 is a schematic side view structure of the positioning block of the utility model;

[0019] Figure 4 is the utility model Figure 1 The enlarged view of part A in.

[0020] Reference numerals: 1, library board room; 2, heavy-duty conveyor mechanism; 3, bottom plate; 4, positioning mechanism; 401, first fixed block; 402, limiting plate; 403, bidirectional threaded rod; 404, first bevel gear; 405, slider; 406, second bevel gear; 407, rotating rod; 408, handle; 409, screw; 410, second fixed block; 5, protection mechanism; 501, U-shaped fixed plate; 502, hinge; 503, positioning block; 6, limiting mechanism; 601, connecting rod; 602, L-shaped fixed plate; 603, electric telescopic rod; 604, connecting block; 605, U-shaped positioning plate; 7, fixed rod; 8, anti-slip pattern. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0023] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inside", "outside", "above", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0025] Such as Figures 1 to 4As shown in the figure, an overloaded quick-freezing device includes a storage panel room 1. A bottom plate 3 is provided on the lower surface of the storage panel room 1. An overloaded conveyor mechanism 2 is placed inside the storage panel room 1. A material box is conveyed on the upper surface of the overloaded conveyor mechanism 2. Limit mechanisms 6 for restricting the conveying position of the material box at the upper end of the overloaded conveyor mechanism 2 are arranged on the left and right sides of the overloaded conveyor mechanism 2. A groove is formed on the lower surface of the bottom plate 3. A positioning mechanism 4 is arranged inside the groove of the bottom plate 3. A protection mechanism 5 is installed on one side of the bottom plate 3. Specifically, by starting the limit mechanism 6 and clamping the limit mechanism 6 on the left and right sides of the material box, the subsequent limit mechanism 6 restricts and positions the conveying path of the material box at the upper end of the overloaded conveyor mechanism 2, thereby minimizing the impact between the subsequent material box and the inner wall of the overloaded conveyor mechanism 2 during the conveying process, which may cause damage to the overloaded conveyor mechanism 2 or the material box. Therefore, the stability of the overloaded conveyor mechanism 2 during the conveying process is improved.

[0026] As Figure 1 and Figure 4 shown in the figure, the limit mechanism 6 includes two groups of connecting rods 601. The two groups of connecting rods 601 are respectively installed on the inner walls of the left and right sides of the overloaded conveyor mechanism 2. The positions of the two groups of connecting rods 601 are both at the upper end of the conveyor belt inside the overloaded conveyor mechanism 2. Card slots are formed on the upper surfaces of the two groups of connecting rods 601. L-shaped fixing plates 602 are slidably connected inside the card slots of the two groups of connecting rods 601. Connecting blocks 604 are arranged on the upper surfaces of the two groups of L-shaped fixing plates 602. Electric telescopic rods 603 are installed on the adjacent sides of the two groups of connecting blocks 604. U-shaped positioning plates 605 are installed at the output ends of the two groups of electric telescopic rods 603. The two groups of U-shaped positioning plates 605 are clamped on the left and right sides of the material box at the upper end of the overloaded conveyor mechanism 2.

[0027] Specifically, before the subsequent staff places food in the material box at the upper end of the overloaded conveyor mechanism 2 for conveying, by pulling the two groups of L-shaped fixing plates 602 to drive the two groups of U-shaped positioning plates 605 to adjust and move to the left and right sides of the material box, and then by starting the two groups of electric telescopic rods 603 to push the two groups of U-shaped positioning plates 605 to move, the two groups of U-shaped positioning plates 605 are respectively clamped on the left and right sides of the material box at the upper end of the overloaded conveyor mechanism 2. And by sliding the two groups of L-shaped fixing plates 602 in the card slots of the two groups of connecting rods 601 respectively, the subsequent material box drives the two groups of U-shaped positioning plates 605 to move synchronously during the moving process. Furthermore, the subsequent limit mechanism 6 restricts and positions the conveying path of the material box at the upper end of the overloaded conveyor mechanism 2, thereby minimizing the impact between the subsequent material box and the inner wall of the overloaded conveyor mechanism 2 during the conveying process, which may cause damage to the overloaded conveyor mechanism 2 or the material box. Therefore, the stability of the overloaded conveyor mechanism 2 during the conveying process is improved.

[0028] As Figure 4As shown, through holes are formed on the adjacent sides of the two sets of connecting blocks 604. Fixed rods 7 are slidably connected inside the through holes of the two sets of connecting blocks 604. The adjacent ends of the two fixed rods 7 are respectively installed on the opposite sides of the two U-shaped positioning plates 605. Specifically, by sliding the two fixed rods 7 inside the through holes of the two sets of connecting blocks 604, the subsequent movement paths of the two fixed rods 7 restrict the movement paths of the two U-shaped positioning plates 605, thereby minimizing the deviation of the movement paths of the two U-shaped positioning plates 605 during subsequent use and preventing the two electric telescopic rods 603 from bending. Therefore, the service life of the limiting mechanism 6 is extended.

[0029] As Figure 1 and Figure 2 As shown, the positioning mechanism 4 includes two sets of first fixing blocks 401 and a second fixing block 410. The two sets of first fixing blocks 401 are both installed at the openings on the front and rear sides of the groove of the bottom plate 3. Through holes are formed on the adjacent sides of the two sets of first fixing blocks 401. A bidirectional threaded rod 403 is rotatably connected inside the through holes of the two sets of first fixing blocks 401. Two sliders 405 are threadedly connected to the outside of the bidirectional threaded rod 403. The two sliders 405 are both slidably connected inside the groove of the bottom plate 3. Threaded holes are formed on the lower surfaces of the two sliders 405. Screws 409 are threadedly connected inside the two sliders 405. Limiting plates 402 are threadedly connected to the outside of the two screws 409. A clamping groove is formed on one side of the groove of the bottom plate 3 close to the protection mechanism 5. The second fixing block 410 is installed inside the clamping groove of the bottom plate 3. A through hole is formed on the side of the second fixing block 410 close to the groove of the bottom plate 3. A rotating rod 407 is installed inside the through hole of the second fixing block 410. A second bevel gear 406 is arranged on the side of the rotating rod 407 close to the bidirectional threaded rod 403. The external teeth of the second bevel gear 406 are meshed with a first bevel gear 404. The first bevel gear 404 is installed on the outer surface of the bidirectional threaded rod 403. A handle 408 is installed on the side of the rotating rod 407 away from the second bevel gear 406.

[0030] Specifically, when the width of the subsequent library board room 1 is greater than the width of the carriage, by rotating the handle 408 to drive the rotating rod 407, the second bevel gear 406, and the first bevel gear 404 to trigger the bidirectional threaded rod 403 to drive the two sliders 405 to slide inside the groove of the bottom plate 3, and adjusting the adjacent sides of the two first bevel gears 404 to move to the outer surfaces of the left and right sides of the carriage respectively. Then, by rotating the two screws 409, the two limiting plates 402 are installed at the lower ends of the two sliders 405, so that the adjacent sides of the two subsequent limiting plates 402 are respectively abutted against the outer surfaces of the left and right sides of the carriage. Furthermore, the subsequent positioning mechanism 4 performs secondary limitation on the position of the library board room 1 at the upper end of the carriage, thereby minimizing the movement of the subsequent device during transportation. Therefore, the stability of the device during vehicle transportation is improved.

[0031] As Figure 2As shown, the adjacent sides of the two groups of limit plates 402 are provided with anti-skid grooves 8; specifically, the positions of the two groups of anti-skid grooves 8 are set on the adjacent sides of the two groups of limit plates 402, so that when the adjacent sides of the two subsequent groups of limit plates 402 are respectively abutted against the left and right outer surfaces of the transport vehicle compartment, the two groups of anti-skid grooves 8 increase the friction between the two groups of limit plates 402 and the connecting surface of the compartment, thereby improving the stability of the subsequent two groups of limit plates 402 during the positioning and clamping process.

[0032] like Figure 3 and Figure 4 As shown, the protective mechanism 5 includes two sets of pages 502, and the two sets of pages 502 are installed on the side of the base plate 3 away from the heavy-load conveying mechanism 2. The base plate 3 is hinged with a U-shaped fixing plate 501 through the two sets of pages 502. A positioning block 503 is installed on the side of the U-shaped fixing plate 501 close to the base plate 3. Two groups of positioning grooves are opened on the side of the base plate 3 close to the hinge 502. The two groups of positioning blocks 503 are respectively clamped in the two groups of positioning grooves of the base plate 3, and the position of the handle 408 is set inside the U-shaped fixing plate 501; specifically, by rotating the U-shaped fixing plate 501, the two groups of positioning blocks 503 are clamped in the two groups of positioning grooves of the base plate 3, so that the U-shaped fixing plate 501 is installed and positioned at the outer end of the handle 408, and then the subsequent U-shaped fixing plate 501 blocks and protects the handle 408, thereby trying to avoid subsequent staff from being injured after colliding with the handle 408 during walking, thereby improving the safety of the positioning mechanism 4 during use.

[0033] In summary: by pulling the two groups of L-shaped fixing plates 602, the two groups of U-shaped positioning plates 605 are driven to adjust and move to the left and right sides of the material frame, and then by starting the two groups of electric telescopic rods 603, the two groups of U-shaped positioning plates 605 are pushed to move, and the two groups of U-shaped positioning plates 605 are respectively clamped on the left and right sides of the material frame at the upper end of the heavy-duty conveying mechanism 2, and the two groups of L-shaped fixing plates 602 are respectively slidably connected to the inside of the card slots of the two groups of connecting rods 601, so that the subsequent material frame synchronously drives the two groups of U-shaped positioning plates 605 to move during the movement, and then the subsequent limiting mechanism 6 limits and positions the conveying path of the material frame at the upper end of the heavy-duty conveying mechanism 2, so as to avoid the subsequent material frame and the inner wall of the heavy-duty conveying mechanism 2 during the conveying process. The collision causes damage to the heavy-load conveying mechanism 2 or the material frame; by turning the handle 408, the rotating rod 407, the bevel gear 2 406, and the bevel gear 1 404 are triggered to drive the two-way threaded rod 403 to drive the two sets of sliders 405 to slide inside the groove of the bottom plate 3, and the adjacent sides of the two sets of bevel gears 1 404 are adjusted and moved to the left and right outer surfaces of the carriage respectively, and then the two sets of limit plates 402 are installed at the lower ends of the two sets of sliders 405 by turning the two sets of screws 409, so that the adjacent sides of the subsequent two sets of limit plates 402 are respectively abutted against the left and right outer surfaces of the carriage, and then the subsequent positioning mechanism 4 performs a second restriction on the position of the warehouse board room 1 at the upper end of the carriage, so as to minimize the subsequent movement of the device during transportation.

[0034] At the same time, by rotating the U-shaped fixing plate 501, the two groups of positioning blocks 503 are clamped in the two groups of positioning slots of the base plate 3, so that the U-shaped fixing plate 501 is installed and positioned at the outer end of the handle 408, and then the subsequent U-shaped fixing plate 501 blocks and protects the handle 408, thereby minimizing the risk of subsequent staff members being injured after colliding with the handle 408 during walking.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A heavy-duty quick-freezing device, comprising a board room (1), characterized in that: The lower surface of the warehouse (1) is provided with a bottom plate (3), a heavy-duty conveying mechanism (2) is placed inside the warehouse (1), a material frame is conveyed on the upper surface of the heavy-duty conveying mechanism (2), and limiting mechanisms (6) are provided on the left and right sides of the heavy-duty conveying mechanism (2) for limiting the conveying position of the material frame at the upper end of the heavy-duty conveying mechanism (2), a groove is provided on the lower surface of the bottom plate (3), a positioning mechanism (4) is provided inside the groove of the bottom plate (3), and a protective mechanism (5) is installed on one side of the bottom plate (3).

2. A heavy-duty quick-freezing device according to claim 1, characterized in that: The limiting mechanism (6) comprises two groups of connecting rods (601), which are respectively mounted on the left and right inner walls of the heavy-load conveying mechanism (2). The positions of the two groups of connecting rods (601) are both arranged at the upper end of the internal conveying belt of the heavy-load conveying mechanism (2). The upper surfaces of the two groups of connecting rods (601) are provided with card slots. The card slots of the two groups of connecting rods (601) are both slidably connected with L-shaped fixing plates (602). The upper surfaces of the two groups of L-shaped fixing plates (602) are both provided with connecting blocks (604). The adjacent sides of the two groups of connecting blocks (604) are both installed with electric telescopic rods (603). The output ends of the two groups of electric telescopic rods (603) are both installed with U-shaped positioning plates (605). The two groups of U-shaped positioning plates (605) are clamped on the left and right sides of the material frame at the upper end of the heavy-load conveying mechanism (2).

3. A heavy-duty quick-freezing device according to claim 2, characterized in that: A through hole is provided on one adjacent side of the two groups of connection blocks (604), and a fixing rod (7) is slidably connected inside the through holes of the two groups of connection blocks (604). Adjacent ends of the two groups of fixing rods (7) are respectively installed on opposite sides of the two groups of U-shaped positioning plates (605).

4. A heavy-duty quick-freezing device according to claim 1, characterized in that: The positioning mechanism (4) comprises two groups of fixing blocks (401) and two fixing blocks (410). The two groups of fixing blocks (401) are installed at the openings on the front and rear sides of the groove of the base plate (3). The adjacent sides of the two groups of fixing blocks (401) are provided with through holes. The through holes of the two groups of fixing blocks (401) are rotatably connected with bidirectional threaded rods (403). The external threads of the bidirectional threaded rods (403) are connected with two groups of sliders (405). The two groups of sliders (405) are slidably connected inside the groove of the base plate (3). The lower surfaces of the two groups of sliders (405) are provided with threaded holes. The internal threads of the two groups of sliders (405) are connected with screws (409). The external threads of the two groups of screws (409) are connected with the limiting plate (410). 02), a slot is provided on the side of the groove of the bottom plate (3) close to the protective mechanism (5), the second fixing block (410) is installed inside the slot of the bottom plate (3), a through hole is provided on the side of the second fixing block (410) close to the groove of the bottom plate (3), a rotating rod (407) is installed inside the through hole of the second fixing block (410), a bevel gear (406) is provided on the side of the rotating rod (407) close to the bidirectional threaded rod (403), the external teeth of the bevel gear (406) are meshedly connected with the bevel gear (404), the bevel gear (404) is installed on the outer surface of the bidirectional threaded rod (403), and a handle (408) is installed on the side of the rotating rod (407) away from the bevel gear (406).

5. A heavy-duty quick-freezing device according to claim 4, characterized in that: The adjacent sides of the two groups of limiting plates (402) are both provided with anti-slip grooves (8).

6. A heavy-duty quick-freezing device according to claim 4, characterized in that: The protection mechanism (5) comprises two sets of hinges (502), the two sets of hinges (502) being mounted on a side of the base plate (3) away from the heavy-load conveying mechanism (2), the base plate (3) being hingedly connected to a U-shaped fixing plate (501) via the two sets of hinges (502), a positioning block (503) being mounted on a side of the U-shaped fixing plate (501) close to the base plate (3), two sets of positioning slots being provided on a side of the base plate (3) close to the hinges (502), the two sets of positioning blocks (503) being respectively clamped inside the two sets of positioning slots of the base plate (3), and the handle (408) being arranged inside the U-shaped fixing plate (501).

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