A logistics transfer device

Abstract

The present invention relates to the field of intelligent transport equipment, and specifically to a logistics transport device, including a base, a moving wheel, a fixed shell, a moving component, a first carrier component and a second carrier component, the fixed shell is fixedly arranged on the base, a cavity penetrating the upper and lower ends is opened on the fixed shell, the moving component is fixedly arranged in the base, the moving direction of the output end of the moving component is parallel to the height direction of the base, the first carrier component is slidably arranged inside the fixed shell, the second carrier component is slidably arranged inside the fixed shell, the number of the second carrier components is two, the two second carrier components are mirror-imaged inside the fixed shell, the second carrier component can rotate when it moves to the highest point, and the rotation axis of the second carrier component is perpendicular to the sliding direction of the second carrier component. The present invention realizes the function of stacking two kinds of goods with large weight differences for transport without complicated operations.

Description

Technical Field

[0001] The present invention relates to the field of intelligent transfer equipment, and in particular to a logistics transfer device. Background Art

[0002] With the rapid development of the express delivery industry, the demand for logistics transfer equipment is increasing. Most of the existing transfer equipment is a single mechanized cart or a self-powered transport cart. The existing carts are generally flatbed or basket-type, and their capacity cannot be adjusted. In addition, it is not convenient to pick up and put heavier goods together with lighter goods. At the same time, when passing through thresholds or raised obstacles on the ground, the device vibrates greatly and the transportation stability is poor.

[0003] Chinese patent application CN114834840A discloses an intelligent logistics transportation and transfer equipment, which stores goods of different volumes and weights through an adjustable loading mechanism, and the driving wheel is lifted off the ground when encountering a threshold through the cooperation of a driving component and a linkage component. However, during use, the scheme arranges the loading frames in sequence through the cooperation of a hydraulic cylinder and a telescopic rod, and then places goods of different volumes and weights in different loading frames, and then controls the loading frames to move down and fix them in sequence. This not only makes the entire process of placing goods more cumbersome, but also reduces the overall rate of placing goods. Summary of the invention

[0004] In view of the above problems, a logistics transfer device is provided, which controls the movement of the first carrier component and the second carrier component through a moving component, and the rotational movement of the second carrier component ensures that the first carrier component will not be blocked when moving to a fixed position.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A logistics transfer device is provided, comprising a base, moving wheels and a fixed shell. The transfer device also comprises a moving component, a first carrier component and a second carrier component. The fixed shell is fixedly arranged on the base, and a cavity running through the upper and lower ends is opened on the fixed shell. The moving component is fixedly arranged in the base. The moving direction of the output end of the moving component is parallel to the height direction of the base, and the output end of the moving component can be moved to the inside of the fixed shell. The first carrier component can be slidably arranged in the fixed shell, and the sliding direction of the first carrier component is parallel to the moving direction of the output end of the moving component. The second carrier component can be slidably arranged in the fixed shell, and the sliding direction of the second carrier component is parallel to the moving direction of the output end of the moving component. The first carrier component is between the moving component and the second carrier component. There are two second carrier components, and the two second carrier components are mirror-imaged and arranged in the fixed shell. The second carrier component can rotate when it moves to the highest point, and the rotating axis of the second carrier component is perpendicular to the sliding direction of the second carrier component.

[0007] Preferably, a plurality of springs are fixedly arranged inside the base, the axes of the springs are parallel to the height direction of the base, and the ends of the springs away from the base are fixedly connected to a surface of the first loading assembly close to the base.

[0008] Preferably, the moving assembly includes a driving motor, a first threaded rod, a threaded slider, a long slider, a connecting strip and a fixed plate. The driving motor is fixedly arranged inside the base. The first threaded rod is transmission-connected to the driving motor. The axis of the first threaded rod is parallel to the height direction of the base. The first threaded rod is a bidirectional threaded rod. The two sections of the thread of the bidirectional threaded rod are respectively threadedly connected with threaded sliders. The long slider is fixedly connected to the threaded slider. The length direction of the long slider is perpendicular to the axis of the first threaded rod. The two ends of the long slider are respectively hinged with connecting strips, which are hinged to the fixed plate. The fixed plate is located below the first loading assembly.

[0009] Preferably, a first limiting strip is fixedly provided on two mutually parallel inner side walls of the base, the length direction of the first limiting strip is parallel to the axis of the first threaded rod, and the first limiting strip is located below the fixing plate.

[0010] Preferably, the second carrier assembly includes a fixed frame, a second threaded rod and a movable plate. The fixed frame is "U"-shaped, and the fixed frame is slidably arranged inside the fixed shell. The sliding direction of the fixed frame is parallel to the height direction of the base, the fixed frame is in contact with the inner wall of the fixed shell, and the two protruding ends of the fixed frame are arranged in a direction away from the first carrier assembly. The line connecting the two protruding ends of the fixed frame is parallel to the axis of the first threaded rod. The second threaded rod is threadedly connected to the protruding end on the fixed frame, and the axis of the second threaded rod is parallel to the line connecting the two protruding ends of the fixed frame. The movable plate can be rotatably connected to the second threaded rod, and the movable plate is located between the two protruding ends of the fixed frame.

[0011] Preferably, the second loading assembly further comprises a torsion spring, which is fixedly disposed between the movable plate and the protruding end of the fixing frame, and the axis of the torsion spring is coaxially disposed with the second threaded rod.

[0012] Preferably, the second loading assembly further includes a fixing bar, both ends of which are fixedly connected to the end of a fixing frame respectively, and the length direction of the fixing bar is perpendicular to the axis of the second threaded rod.

[0013] Preferably, a limiting bolt is fixedly provided on the fixing frame, and a limiting slide groove cooperating with the limiting bolt for sliding is provided on the fixing shell, and the length direction of the limiting slide groove is parallel to the height direction of the fixing shell.

[0014] Preferably, a first magnetic strip is fixedly provided on one end of the fixed shell away from the base, and a second magnetic strip cooperating with the first magnetic strip is fixedly provided on the movable plate.

[0015] Preferably, a second limit bar is fixedly arranged inside the fixed shell, the length direction of the second limit bar is parallel to the height direction of the fixed shell, a first limit hole cooperating with the sliding of the second limit bar is opened on the fixed plate, a second limit hole cooperating with the sliding of the second limit bar is opened on the first loading component, a third limit hole cooperating with the sliding of the second limit bar is opened on the fixed frame, and a fourth limit hole cooperating with the sliding of the second limit bar is opened on the movable plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention realizes the function of controlling the movement of the first carrier component and the second carrier component through the moving component, and realizes the function of ensuring that the first carrier component will not be blocked when moving to a fixed position through the rotational movement of the second carrier component, thereby making it possible to stack two types of goods with a large difference in weight separately for transportation without complicated operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the transport status of a logistics transfer device;

[0019] Figure 2 It is a three-dimensional schematic diagram of the loading and unloading status of a logistics transfer device;

[0020] Figure 3 It is a three-dimensional schematic diagram of a logistics transfer device;

[0021] Figure 4 It is a three-dimensional schematic diagram of a fixed shell in a logistics transfer device;

[0022] Figure 5 It is a three-dimensional schematic diagram of a base in a logistics transfer device;

[0023] Figure 6 It is a three-dimensional exploded schematic diagram of a base in a logistics transfer device;

[0024] Figure 7 It is a three-dimensional schematic diagram of a first cargo-carrying component in a logistics transfer device;

[0025] Figure 8 It is a three-dimensional schematic diagram of a second cargo-carrying component in a logistics transfer device;

[0026] Fig. 9 It is a three-dimensional exploded schematic diagram of a second cargo-carrying component in a logistics transfer device;

[0027] Fig.10 yes Fig. 9 A is a partial enlarged schematic diagram of the middle part.

[0028] The numbers in the figure are:

[0029] 1- Base;

[0030] 11- Spring;

[0031] 12- first limit bar;

[0032] 2-Moving wheels;

[0033] 3-Fix the shell;

[0034] 31-cavity;

[0035] 32-limiting slide;

[0036] 33-first magnetic stripe;

[0037] 34- second limit strip;

[0038] 4- Mobile components;

[0039] 41- driving motor;

[0040] 42-first threaded rod;

[0041] 43-threaded slider;

[0042] 44-long slider;

[0043] 45-connecting strip;

[0044] 46-fixed plate; 461-first limiting hole;

[0045] 5- first loading assembly;

[0046] 51- second limiting hole;

[0047] 6- second loading assembly;

[0048] 61-fixed frame; 611-limiting bolt; 612-third limiting hole;

[0049] 62- second threaded rod;

[0050] 63-movable plate; 631-second magnetic strip; 632-fourth limiting hole;

[0051] 64-torsion spring;

[0052] 65-Fixed bar. DETAILED DESCRIPTION

[0053] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0054] See also Figures 1 to 10As shown, a logistics transfer device includes a base 1, a moving wheel 2 and a fixed shell 3, the transfer device also includes a moving component 4, a first carrier component 5 and a second carrier component 6, the fixed shell 3 is fixedly arranged on the base 1, and a cavity 31 running through the upper and lower ends is opened on the fixed shell 3, the moving component 4 is fixedly arranged in the base 1, the moving direction of the output end of the moving component 4 is parallel to the height direction of the base 1, and the output end of the moving component 4 can be moved to the inside of the fixed shell 3, the first carrier component 5 can be slidably arranged in the fixed shell 3, and the sliding direction of the first carrier component 5 is parallel to the moving direction of the output end of the moving component 4, the second carrier component 6 can be slidably arranged in the fixed shell 3, and the sliding direction of the second carrier component 6 is parallel to the moving direction of the output end of the moving component 4, the first carrier component 5 is between the moving component 4 and the second carrier component 6, the number of the second carrier components 6 is two, and the two second carrier components 6 are mirror-imaged and arranged in the fixed shell 3, the second carrier component 6 can rotate when it moves to the highest point, and the rotation axis of the second carrier component 6 is perpendicular to the sliding direction of the second carrier component 6.

[0055] The working end of the moving component 4 is controlled to move upward in the vertical direction. After the working end of the moving component 4 contacts the first carrying component 5, it drives the first carrying component 5 to move. When the first carrying component 5 moves upward in the vertical direction, it will contact the second carrying component 6. At this time, the second carrying component 6 also moves upward in the vertical direction. When the second carrying component 6 moves to the highest point, the second carrying component 6 rotates, and the first carrying component 5 under the second carrying component 6 will no longer be blocked. At this time, the goods with larger volume and weight are placed on the first carrying component 5, and then the output end of the moving component 4 is controlled to move upward in the vertical direction. The first carrier component 5 moves downward, and there is no supporting force below the first carrier component 5. At this time, the first carrier component 5 also moves downward in the vertical direction, and the second carrier component 6 is rotated in the opposite direction so that the second carrier component 6 is above the first carrier component 5, and the goods with smaller volume and weight are placed on the second carrier component 6. Compared with the prior art, the moving component 4 of the present invention controls the first carrier component 5 and the second carrier component 6 to move, and the rotational movement of the second carrier component 6 ensures that the first carrier component 5 will not be blocked when it moves to a fixed position, so that two kinds of goods with a large difference in weight can be stacked separately for transportation without complicated operations.

[0056] See also Figure 3 and Figure 5 As shown: a plurality of springs 11 are fixedly arranged inside the base 1 , the axis of the spring 11 is parallel to the height direction of the base 1 , and the distal end of the spring 11 is fixedly connected to a surface of the first carrier assembly 5 close to the base 1 .

[0057] After the second carrier component 6 rotates, it controls the working end of the movable component 4 to move downward in the vertical direction. The first carrier component 5 moves and follows it for a certain distance and then contacts the spring 11. At this time, the first carrier component 5 is in an upper position in the fixed shell 3. Compared with the prior art, the spring 11 of the present invention enables the first carrier component 5 to automatically move downward as the load increases, thereby eliminating the need for manual control of the movement of the first carrier component 5.

[0058] See also Figure 3 , Figure 5 and Figure 6 As shown: the moving component 4 includes a driving motor 41, a first threaded rod 42, a threaded slider 43, a long slider 44, a connecting bar 45 and a fixed plate 46. The driving motor 41 is fixedly arranged inside the base 1. The first threaded rod 42 is transmission-connected to the driving motor 41. The axis of the first threaded rod 42 is parallel to the height direction of the base 1. The first threaded rod 42 is a bidirectional threaded rod. The two sections of the thread of the bidirectional threaded rod are respectively threadedly connected with the threaded slider 43. The long slider 44 is fixedly connected to the threaded slider 43. The length direction of the long slider 44 is perpendicular to the axis of the first threaded rod 42. The two ends of the long slider 44 are respectively hinged with connecting bars 45. The connecting bar 45 is hinged to the fixed plate 46. The fixed plate 46 is located below the first loading component 5.

[0059] Start the driving motor 41, and the two threaded sliders 43 on the first threaded rod 42 will drive the matching long sliders 44 to move closer to or away from each other. The fixed plate 46 connected to the long sliders 44 through the connecting strip 45 moves in the vertical direction at this time. Compared with the prior art, the fixed plate 46 of the present invention ensures that there is a larger contact area between the output end of the moving component 4 and the first carrier component 5, thereby ensuring that the output end of the moving component 4 can stably push the first carrier component 5 to move upward.

[0060] See also Figure 3 , Figure 5 and Figure 6 As shown: a first limiting strip 12 is fixedly provided on two mutually parallel inner side walls of the base 1 , the length direction of the first limiting strip 12 is parallel to the axis of the first threaded rod 42 , and the first limiting strip 12 is located below the fixing plate 46 .

[0061] The fixed plate 46 moves downward in the vertical direction, and after moving a certain distance, it contacts the first limiting strip 12, and the fixed plate 46 stops moving. Compared with the prior art, the first limiting strip 12 of the present invention limits the lowest position of the fixed plate 46, thereby ensuring that the movement of the fixed plate 46 will not fail.

[0062] See also Figure 3 , Figure 8 , Fig. 9 and Fig.10As shown: the second carrier assembly 6 includes a fixed frame 61, a second threaded rod 62 and a movable plate 63. The fixed frame 61 is "U"-shaped. The fixed frame 61 is slidably arranged inside the fixed shell 3. The sliding direction of the fixed frame 61 is parallel to the height direction of the base 1. The fixed frame 61 is in contact with the inner wall of the fixed shell 3. The two protruding ends of the fixed frame 61 are arranged in a direction away from the first carrier assembly 5. The connecting line of the two protruding ends of the fixed frame 61 is parallel to the axis of the first threaded rod 42. The second threaded rod 62 is threadedly connected to the protruding end on the fixed frame 61. The axis of the second threaded rod 62 is parallel to the connecting line of the two protruding ends of the fixed frame 61. The movable plate 63 can be rotatably connected to the second threaded rod 62. The movable plate 63 is located between the two protruding ends of the fixed frame 61.

[0063] When the fixing frame 61 moves to the top of the fixed shell 3, the movable plate 63 can rotate. When the fixing frame 61 is inside the fixed shell 3, the movable plate 63 will not be able to rotate. Compared with the prior art, the fixing frame 61 of the present invention limits the position where the movable plate 63 can rotate, thereby ensuring that the second loading assembly 6 will not rotate when it is inside the fixed shell 3.

[0064] See also Figure 3 , Figure 8 , Fig. 9 and Fig.10 As shown, the second object-carrying assembly 6 further includes a torsion spring 64 , which is fixedly disposed between the movable plate 63 and the protruding end of the fixing frame 61 , and the axis of the torsion spring 64 is coaxially disposed with the second threaded rod 62 .

[0065] When the fixing frame 61 is inside the fixing shell 3, the torsion spring 64 is in a compressed state. When the fixing frame 61 moves to the top end of the fixing shell 3, the torsion spring 64 contacts the compressed state to provide elastic force, and the movable plate 63 rotates automatically. Compared with the prior art, the torsion spring 64 of the present invention enables the movable plate 63 moved to the top end of the fixing shell 3 to rotate automatically, thereby eliminating the need for the staff to manually control the movable plate 63 to rotate.

[0066] See also Figure 3 , Figure 8 , Fig. 9 and Fig.10 As shown, the second loading assembly 6 also includes a fixing bar 65 , both ends of which are fixedly connected to the end of a fixing frame 61 , respectively, and the length direction of the fixing bar 65 is perpendicular to the axis of the second threaded rod 62 .

[0067] When one fixing frame 61 moves, the fixing bar 65 will drive the other fixing frame 61 to move simultaneously. Compared with the prior art, the fixing bar 65 of the present invention enables the two fixing frames 61 to move synchronously, thereby avoiding the height difference between the two second loading assemblies 6 .

[0068] See also Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.10 As shown: a limiting bolt 611 is fixedly arranged on the fixing frame 61, and a limiting sliding groove 32 cooperating with the limiting bolt 611 for sliding is opened on the fixing shell 3, and the length direction of the limiting sliding groove 32 is parallel to the height direction of the fixing shell 3.

[0069] The fixing frame 61 moves upward in the vertical direction, and the fixing frame 61 moves a certain distance. At this time, the limiting bolt 611 contacts the end of the limiting slide groove 32, and the fixing frame 61 stops moving. Compared with the prior art, the limiting bolt 611 and the limiting slide groove 32 of the present invention limit the moving range of the fixing frame 61, thereby ensuring that the fixing frame 61 will not separate from the fixing shell 3.

[0070] See also Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.10 As shown: a first magnetic strip 33 is fixedly disposed on one end of the fixed shell 3 away from the base 1 , and a second magnetic strip 631 cooperating with the first magnetic strip 33 is fixedly disposed on the movable plate 63 .

[0071] When the fixed frame 61 moves to the top of the fixed shell 3, the movable plate 63 rotates, and the second magnetic strip 631 fixed on the movable plate 63 is close to the first magnetic strip 33. At this time, the movable plate 63 will not rotate easily. Compared with the prior art, the first magnetic strip 33 and the second magnetic strip 631 of the present invention fix the position of the movable plate 63 after rotation, so that the movable plate 63 will not cause obstruction when loading the first loading component 5.

[0072] See also Figures 3 to 10 As shown: a second limit strip 34 is fixedly arranged inside the fixed shell 3, the length direction of the second limit strip 34 is parallel to the height direction of the fixed shell 3, a first limit hole 461 is provided on the fixed plate 46 to cooperate with the sliding of the second limit strip 34, a second limit hole 51 is provided on the first loading assembly 5 to cooperate with the sliding of the second limit strip 34, a third limit hole 612 is provided on the fixed frame 61 to cooperate with the sliding of the second limit strip 34, and a fourth limit hole 632 is provided on the movable plate 63 to cooperate with the sliding of the second limit strip 34.

[0073] The fixed plate 46, the first carrier assembly 5 and the second carrier assembly 6 always maintain contact with the second limit bar 34 when moving in the vertical direction. Compared with the prior art, the second limit bar 34 of the present invention limits the moving state of the fixed plate 46, the first carrier assembly 5 and the second carrier assembly 6, thereby ensuring the stability of the movement of the fixed plate 46, the first carrier assembly 5 and the second carrier assembly 6.

[0074] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A logistics transfer device, comprising a base (1), a moving wheel (2) and a fixed shell (3), characterized in that: The transfer device further comprises a moving component (4), a first object carrying component (5) and a second object carrying component (6); The fixed shell (3) is fixedly arranged on the base (1), and a cavity (31) penetrating the upper and lower ends is formed on the fixed shell (3); The moving component (4) is fixedly arranged in the base (1), the moving direction of the output end of the moving component (4) is parallel to the height direction of the base (1), and the output end of the moving component (4) can move to the inside of the fixed shell (3); The first object carrier component (5) is slidably arranged inside the fixed shell (3), and the sliding direction of the first object carrier component (5) is parallel to the moving direction of the output end of the moving component (4); The second carrier assembly (6) is slidably arranged inside the fixed shell (3), the sliding direction of the second carrier assembly (6) is parallel to the moving direction of the output end of the movable assembly (4), the first carrier assembly (5) is between the movable assembly (4) and the second carrier assembly (6), the number of the second carrier assembly (6) is two, the two second carrier assemblies (6) are arranged in a mirror image inside the fixed shell (3), the second carrier assembly (6) can rotate when it moves to the highest point, and the rotation axis of the second carrier assembly (6) is perpendicular to the sliding direction of the second carrier assembly (6); The second object-carrying assembly (6) comprises a fixed frame (61), a second threaded rod (62) and a movable plate (63); The fixing frame (61) is in a "U" shape. The fixing frame (61) is slidably arranged inside the fixing shell (3). The sliding direction of the fixing frame (61) is parallel to the height direction of the base (1). The fixing frame (61) is in contact with the inner wall of the fixing shell (3). The two protruding ends of the fixing frame (61) are arranged in a direction away from the first object-carrying component (5). The connecting line of the two protruding ends of the fixing frame (61) is parallel to the axis of the first threaded rod (42). The second threaded rod (62) is threadedly connected to the protruding end on the fixing frame (61). The axis of the second threaded rod (62) is parallel to the connecting line of the two protruding ends of the fixing frame (61). The movable plate (63) is rotatably connected to the second threaded rod (62). The movable plate (63) is located between the two protruding ends of the fixing frame (61).

2. A logistics transfer device according to claim 1, characterized in that: A plurality of springs (11) are fixedly arranged inside the base (1); The axis of the spring (11) is parallel to the height direction of the base (1), and the distal end of the spring (11) is fixedly connected to a surface of the first loading assembly (5) close to the base (1).

3. A logistics transfer device according to claim 2, characterized in that: The moving assembly (4) comprises a driving motor (41), a first threaded rod (42), a threaded slider (43), a long slider (44), a connecting bar (45) and a fixing plate (46); The driving motor (41) is fixedly arranged inside the base (1), the first threaded rod (42) is drivingly connected to the driving motor (41), the axis of the first threaded rod (42) is parallel to the height direction of the base (1), the first threaded rod (42) is a bidirectional threaded rod, and the two sections of the thread of the bidirectional threaded rod are respectively threadedly connected with a threaded slider (43), the long slider (44) is fixedly connected to the threaded slider (43), the length direction of the long slider (44) is perpendicular to the axis of the first threaded rod (42), and the two ends of the long slider (44) are respectively hinged with a connecting strip (45), and the connecting strip (45) is hinged to a fixed plate (46), and the fixed plate (46) is located below the first loading assembly (5).

4. A logistics transfer device according to claim 3, characterized in that: A first limiting strip (12) is fixedly arranged on two mutually parallel inner side walls of the base (1); The length direction of the first limiting strip (12) is parallel to the axis of the first threaded rod (42), and the first limiting strip (12) is located below the fixing plate (46).

5. A logistics transfer device according to claim 4, characterized in that: The second object carrier assembly (6) further comprises a torsion spring (64); The torsion spring (64) is fixedly arranged between the movable plate (63) and the protruding end of the fixing frame (61), and the axis of the torsion spring (64) is coaxially arranged with the second threaded rod (62).

6. A logistics transfer device according to claim 5, characterized in that: The second object carrier assembly (6) further includes a fixing bar (65); The two ends of the fixing strip (65) are respectively fixedly connected to the end of a fixing frame (61), and the length direction of the fixing strip (65) is perpendicular to the axis of the second threaded rod (62).

7. A logistics transfer device according to claim 6, characterized in that: A limiting bolt (611) is fixedly arranged on the fixing frame (61), and a limiting sliding groove (32) cooperating with the limiting bolt (611) for sliding is provided on the fixing shell (3), and the length direction of the limiting sliding groove (32) is parallel to the height direction of the fixing shell (3).

8. A logistics transfer device according to claim 7, characterized in that: A first magnetic strip (33) is fixedly arranged at one end of the fixed shell (3) away from the base (1), and a second magnetic strip (631) cooperating with the first magnetic strip (33) is fixedly arranged on the movable plate (63).

9. A logistics transfer device according to claim 8, characterized in that: A second limiting strip (34) is fixedly arranged inside the fixed shell (3), the length direction of the second limiting strip (34) is parallel to the height direction of the fixed shell (3), a first limiting hole (461) is provided on the fixed plate (46) to cooperate with the sliding of the second limiting strip (34), a second limiting hole (51) is provided on the first loading assembly (5) to cooperate with the sliding of the second limiting strip (34), a third limiting hole (612) is provided on the fixed frame (61) to cooperate with the sliding of the second limiting strip (34), and a fourth limiting hole (632) is provided on the movable plate (63) to cooperate with the sliding of the second limiting strip (34).

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