Sealing machine

Abstract

The utility model relates to the technical field of packaging equipment, and discloses a sealing machine. The sealing machine comprises a fixing frame, a driving structure arranged on the fixing frame, a transmission structure movably arranged at the output end of the driving structure, a first swing mechanism movably arranged at one end of the transmission structure, and a second swing mechanism movably arranged at the other end of the transmission structure. The upper sealing and cutting assemblies are arranged at one end of the first swing mechanism and one end of the second swing mechanism respectively, the lower sealing and cutting assemblies are arranged at the other end of the first swing mechanism and the other end of the second swing mechanism respectively, and the lower sealing and cutting assemblies are located in the orthographic projection range of the upper sealing and cutting assemblies. The driving structure drives the transmission structure to drive the upper sealing and cutting assembly and the lower sealing and cutting assembly to be opened and closed while driving the first swing mechanism and the second swing mechanism to move. The sealing machine is low in manufacturing cost, simple in structure and simple and efficient in transmission mode.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging equipment, in particular to a sealing machine. Background Art

[0002] With the development of society and the improvement of people's living standards, product diversity is increasing, and the requirements for product packaging are also increasing. After the product is produced, a critical process needs to be carried out: packaging and sealing. Packaging machinery has been widely used in various industries due to its high efficiency, easy operation, and easy maintenance.

[0003] In the prior art, sealing machines generally use gears and racks as transmission devices to enable the sealing machine to achieve hot cutting and sealing. However, the matching method of the gears and racks is prone to wear, and the gears and racks require higher matching precision, which makes the sealing machine more expensive and has a complex structure. Utility Model Content

[0004] The main purpose of the utility model is to provide a sealing machine, aiming to solve the technical problems of the sealing machine in the prior art, such as easy wear, high cost and complex structure.

[0005] To achieve the above-mentioned objectives, the utility model provides a sealing machine, which includes a fixed frame, a driving structure arranged on the fixed frame, a transmission structure movably arranged on the output end of the driving structure, a first swinging mechanism movably arranged on one end of the transmission structure, a second swinging mechanism movably arranged on the other end of the transmission structure, an upper sealing and cutting assembly respectively arranged on one end of the first swinging mechanism and one end of the second swinging mechanism, and a lower sealing and cutting assembly respectively arranged on the other end of the first swinging mechanism and the other end of the second swinging mechanism, and the lower sealing and cutting assembly is located within the orthographic projection range of the upper sealing and cutting assembly, and the driving structure drives the transmission structure to drive the first swinging mechanism and the second swinging mechanism to move, while driving the upper sealing and cutting assembly and the lower sealing and cutting assembly to open and close.

[0006] Furthermore, in one embodiment, the transmission structure is a strip-shaped structure, the first swing mechanism is hinged to one end of the strip-shaped structure, and the second swing mechanism is hinged to the other end of the strip-shaped structure.

[0007] Furthermore, in one embodiment, the first swinging mechanism and the second swinging mechanism have the same structure, the first swinging mechanism includes a swinging block and a linkage structure, the swinging block is hinged to the transmission structure, the linkage structure is fixed to the swinging block, and the linkage structure is movably arranged on the fixed frame.

[0008] Furthermore, in one embodiment, the transmission structure is provided with a through slot, one end of the swing block is inserted into and hinged in the through slot, and the other end of the swing block is sleeved on the linkage structure, and the through slot is a bar-shaped hole.

[0009] Furthermore, in one embodiment, the linkage structure includes a first long connecting rod, a first short connecting rod, a first transmission arm and a first transmission rod, the first transmission rod can be rotatably arranged horizontally on both sides of the fixed frame, the first transmission arm is sleeved on one end of the first transmission rod, one end of the first long connecting rod is arranged on the end of the first transmission arm close to the driving structure, the other end of the first long connecting rod is arranged on the upper sealing and cutting assembly, one end of the first short connecting rod is arranged on the other end of the first transmission arm, and the other end of the first short connecting rod is arranged on the lower sealing and cutting assembly.

[0010] Furthermore, in one embodiment, the linkage structure also includes a second long connecting rod, a second short connecting rod and a second transmission arm, the second transmission arm is sleeved on the other end of the first transmission rod, the second long connecting rod is arranged on one end of the second transmission arm close to the driving structure, the other end of the first long connecting rod is arranged on the upper sealing and cutting assembly, one end of the first short connecting rod is arranged on the other end of the second transmission arm, and the other end of the first short connecting rod is arranged on the lower sealing and cutting assembly.

[0011] Furthermore, in one embodiment, the sealing machine also includes a guide structure, which includes a first guide block, a second guide block and a guide column, the first guide block is arranged on the upper sealing and cutting assembly, the second guide block is arranged on the lower sealing and cutting assembly, and one end of the guide column passes through the first guide block and the second guide block in sequence and is arranged on the fixed frame.

[0012] Furthermore, in one embodiment, the upper sealing and cutting assembly includes a first fixed seat and a sealing and cutting knife, the first swinging mechanism is arranged on both sides of the first fixed seat, the second swinging mechanism is arranged on both sides of the first fixed seat, and the first swinging mechanism and the second swinging mechanism are respectively located at both ends of the first fixed seat, the sealing and cutting knife is arranged on the first fixed seat, and the blade of the sealing and cutting knife is arranged toward one side of the lower sealing and cutting assembly.

[0013] Furthermore, in one embodiment, the lower sealing and cutting assembly includes a knife seat and a second fixed seat, the first swinging mechanism is arranged on both sides of the second fixed seat, the second swinging mechanism is arranged on both sides of the second fixed seat, and the first swinging mechanism and the second swinging mechanism are respectively located at both ends of the second fixed seat, the knife seat is arranged on the second fixed seat, and the knife seat is arranged toward the side of the sealing and cutting knife.

[0014] Furthermore, in one embodiment, the transmission structure is provided with a first through hole that passes across the through slot, and a second through hole is provided at one end of the swing block corresponding to the first through hole, and the first swing mechanism also includes a fastener, which passes through the first through hole and the second through hole in sequence and is arranged on the transmission structure.

[0015] The technical solution provided by the present invention is to provide a driving structure on a fixed frame, movably provide a transmission structure on the output end of the driving structure, respectively provide a first swing mechanism and a second swing mechanism on opposite ends of the transmission structure, respectively provide two ends of the upper sealing and cutting assembly on one end of the first swing mechanism and one end of the second swing mechanism, respectively provide two ends of the lower sealing and cutting assembly on the other end of the first swing mechanism and the other end of the second swing mechanism, and the lower sealing and cutting assembly is located within the orthographic projection range of the upper sealing and cutting assembly, so that the driving structure drives the transmission structure to drive the first swing mechanism and the second swing mechanism to move, while driving the upper and lower sealing and cutting assemblies to open and close. This achieves a low cost sealing and cutting machine with a simple structure and a simple and efficient transmission method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 This is a structural diagram of a sealing machine according to an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the driving structure, transmission structure, first swing mechanism and second swing mechanism of the utility model;

[0019] Figure 3 This is a schematic structural diagram of the transmission structure and swing block of the utility model;

[0020] Figure 4 This is a structural diagram of the sealing machine of the present invention without the fixing frame.

[0021] Among them, 100, sealing machine; 10, fixed frame; 101, first side plate; 102, second side plate; 103, third side plate; 104, third fixed seat; 20, driving structure; 30, transmission structure; 301, through groove; 302, first through hole; 40, first swing mechanism; 41, swing block; 42, linkage structure; 420, first long connecting rod; 421, first short connecting rod; 422, first transmission arm; 423, first transmission rod; 424, second long connecting rod; 425, second short connecting rod; 426, second transmission arm; 50, second swing mechanism; 60, upper sealing and cutting assembly; 601, first fixed seat; 602, sealing and cutting knife; 70, lower sealing and cutting assembly; 701, knife seat; 702, second fixed seat; 80, guide structure; 801, first guide block; 802, second guide block; 803, guide column; 90, fastener. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element, or one or more elements can be interposed therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more elements can be interposed therebetween. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only. In the description of the present invention, the terms "first" and "second" are used solely for descriptive purposes and are not to be construed as indicating relative importance or implicitly specifying the number of technical features indicated. Therefore, unless otherwise specified, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0023] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. All technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not used to limit the utility model. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0024] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please refer to Figure 1-Figure 4 , an embodiment of the present utility model discloses a sealing machine 100 .

[0026] In one embodiment, if Figure 1-Figure 4 As shown, the sealing machine 100 includes a fixing frame 10 , a driving structure 20 , a transmission structure 30 , a first swing mechanism 40 , a second swing mechanism 50 , an upper sealing and cutting assembly 60 and a lower sealing and cutting assembly 70 .

[0027] The fixing frame 10 includes a first side plate 101 , a second side plate 102 and a third side plate 103 . The second side plate 102 is perpendicularly connected to the first side plate 101 and the third side plate 103 , respectively. The first side plate 101 and the third side plate 103 are arranged in parallel.

[0028] The driving structure 20 can be any one of a linear motor, a pneumatic cylinder or a hydraulic cylinder. The driving structure 20 is used to perform linear reciprocating motion. The driving structure 20 is disposed on the second side plate 102 and is located between the first side plate 101 and the second side plate 102 .

[0029] The transmission structure 30 is a strip-shaped structure with a simple structure and low manufacturing cost. The strip-shaped structure is connected to the output end of the driving structure 20 by a hinge, so that the driving structure 20 can drive the strip-shaped structure to perform linear reciprocating motion.

[0030] The first swing mechanism 40 and the second swing mechanism 50 are respectively arranged at the two ends of the strip structure. The first swing mechanism 40 is hinged on one end of the strip structure, and the second swing mechanism is hinged on the other end of the strip structure. The first swing mechanism 40 and the second swing mechanism 50 are used to convert the horizontal linear reciprocating motion of the strip structure into lifting motion.

[0031] When the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70 are closed, the packaging bag is sealed. The ends of the upper sealing and cutting assembly 60 are respectively disposed on one end of the first swing mechanism 40 and one end of the second swing mechanism 50, while the ends of the lower sealing and cutting assembly 70 are respectively disposed on the other end of the first swing mechanism 40 and the other end of the second swing mechanism 50. The lower sealing and cutting assembly 70 is located within the orthographic projection range of the upper sealing and cutting assembly 60. A parallel projection line perpendicular to the projection plane is called an orthographic projection, i.e., the lower sealing and cutting assembly 70 is located directly below the upper sealing and cutting assembly 60. The first swing mechanism 40 and the second swing mechanism 50 simultaneously drive the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70 to move toward or away from each other, allowing the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70 to open and close, sealing and cutting the packaging bag. By configuring the transmission structure 30 as a strip structure and hingedly connecting the first swing mechanism 40 and the second swing mechanism 50 to the strip structure, the sealing machine 100 has a simple structure, a simple and efficient transmission method, and a low cost.

[0032] In one embodiment, if Figure 2 and Figure 3 As shown, the first swing mechanism 40 and the second swing mechanism 50 have the same structure and produce a linkage action through the transmission structure 30. The first swing mechanism 40 includes a swing block 41 and a linkage structure 42. The transmission structure 30 is provided with a through slot 301, which is a strip-shaped hole, so that the swing block 41 can swing in the strip hole. The transmission structure 30 is also provided with a first through hole 302 that crosses the through slot 301. The end of the swing block 41 inserted into the through slot 301 is provided with a second through hole corresponding to the first through hole 302. During installation, the end of the swing block 41 provided with the second through hole is inserted into the through slot 301, and the second through hole on the swing block 41 is aligned with the first through hole 302 on the transmission structure 30. Then, the fastener 90 is inserted into the first through hole 302 and the second through hole from the outside of the transmission structure 30 and fixed to the transmission structure 30. The fastener 90 can be a pin shaft, so that the swing block 41 can rotate on the pin shaft, thereby realizing the swing of the swing block 41; the linkage structure 42 is movably arranged on the fixed frame 10, and one end of the linkage structure 42 is fixedly sleeved on the swing block 41, so that the swing block 41 swings while driving the linkage structure 42 to perform lifting and lowering movements.

[0033] Further, such as Figure 2 and Figure 3As shown, the linkage structure 42 includes a first long link 420, a first short link 421, a first transmission arm 422 and a first transmission rod 423. The first transmission rod 423 can be rotatably arranged on the first side plate 101 and the second side plate 102 of the fixed frame 10. The first transmission rod 423 is a metal round rod. By respectively providing two opposite third fixing seats 104 on the first side plate 101 and the second side plate 102, the third fixing seat 104 is provided with a matching hole adapted to the first transmission rod 423. The two ends of the first transmission rod 423 are respectively inserted into the two matching holes, so that the first transmission rod 423 is fixed. The fixed frame 10 rotates, that is, the driving structure 20 and the transmission structure 30 make linear motion, and the transmission structure 30 drives the swing block 41 to swing along the radial direction of the through slot 301. The first transmission arm 422 is sleeved on one end of the first transmission rod 423, and one end of the first long connecting rod 420 is hingedly connected to the end of the first transmission arm 422 close to the driving structure 20. The other end of the first long connecting rod 420 is arranged on the upper sealing and cutting assembly 60, and one end of the first short connecting rod 421 is hingedly connected to the other end of the first transmission arm 422, and the other end of the first short connecting rod 421 is arranged on the lower sealing and cutting assembly 70.

[0034] The linkage structure 42 also includes a second long link 424, a second short link 425, and a second transmission arm 426. The second transmission arm 426 is sleeved onto the other end of the first transmission rod 423. One end of the second long link 424 is hingedly connected to the end of the second transmission arm 426 near the drive structure 20. The other end of the second long link 424 is mounted on the upper sealing and cutting assembly 60. One end of the second short link 425 is hingedly connected to the other end of the second transmission arm 426. The other end of the first short link 421 is mounted on the lower sealing and cutting assembly 70. The first long link 420 and the second long link 424 are of the same length, and the first short link 421 and the second short link 425 are of the same length. Because the upper sealing and cutting assembly 60 is located above the lower sealing and cutting assembly 70, the length of the first long link 420 must be greater than the length of the first short link 421 to connect to the upper sealing and cutting assembly 60. The first transmission arm 422 and the second transmission arm 426 both have a plate-like structure with a larger center and smaller ends, resulting in a simple structure. When the swing block 41 swings, it drives the first transmission rod 423 to rotate. The rotation of the first transmission rod 423 simultaneously drives the first transmission arm 422 and the second transmission arm 426 fixed thereon to rotate. Since the first transmission arm 422 and the second transmission arm 426 are fixed and sleeved on the first transmission rod 423, during the rotation of the first transmission arm 422 and the second transmission arm 426, the two ends of the first transmission arm 422 and the second transmission arm 426 are one end higher than the other end, so that the swing mechanism converts the linear motion of the transmission structure 30 into a lifting motion, thereby realizing the sealing and cutting of the packaging bag, so that the sealing and cutting machine has a simple structure, a simple transmission method and a low cost.

[0035] like Figure 4As shown, the upper sealing and cutting assembly 60 includes a first fixed base 601 and a sealing and cutting blade 602. The first long connecting rod 420 and the second long connecting rod 424 of the first swing mechanism 40 are respectively fixed to opposite sides of the first fixed base 601. The third long connecting rod of the second swing mechanism 50 and the fourth long connecting rod of the second swing mechanism 50 are respectively fixed to opposite ends of the first fixed base 601. The first swing mechanism 40 and the second swing mechanism 50 are respectively located at opposite ends of the first fixed base 601. The sealing and cutting blade 602 is mounted on the first fixed base 601, with the blade of the sealing and cutting blade 602 facing one side of the lower sealing and cutting assembly 70, so that the sealing and cutting blade 602 can seal and cut the packaging bag when the lower sealing and cutting assembly 70 is closed.

[0036] like Figure 4 As shown, further, the lower sealing and cutting assembly 70 includes a knife seat 701 and a second fixed seat 702, the first short link 421 and the second short link 425 of the first swing mechanism 40 are respectively fixed to the opposite ends of the second fixed seat 702, the third short link and the fourth short link of the second swing mechanism 50 are respectively fixed to the opposite ends of the second fixed seat 702, and the first swing mechanism 40 and the second swing mechanism 50 are respectively located at the opposite ends of the second fixed seat 702, and the knife seat 701 is arranged on the second fixed seat 702, the knife seat 701 is arranged toward the side of the sealing and cutting knife 602, and the knife seat 701 is located directly below the sealing and cutting knife 602.

[0037] like Figure 4 As shown, by providing a guide structure 80, the guidance and stability of the movement of the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70 are enhanced. The sealing machine 100 also includes a guide structure 80, and the guide structure 80 includes a first guide block 801, a second guide block 802 and a guide column 803. The first guide block 801 is arranged on the first fixed seat 601, and the second guide block 802 is arranged on the second fixed seat 702 corresponding to the position of the first guide block 801. One end of the guide column 803 passes through the first guide block 801 and the second guide block 802 in sequence and is fixed to the fixed frame 10, so that the first fixed seat 601 and the second fixed seat 702 can move up and down along the guide column 803, thereby increasing the guidance and stability of the sealing machine 100.

[0038] The number of guide structures 80 can be 1, 2, 3, 4, 5, 6, etc. The specific number is not limited in this embodiment and can be set according to actual conditions. Preferably, the number of guide structures 80 is 4, two of which are arranged on the first side plate 101 of the fixed frame 10, and the other two are arranged on the third side plate 103 of the fixed frame 10, and each guide mechanism is arranged close to the linkage structure 42 to enhance the stability and guidance of the movement of the sealing and cutting machine.

[0039] When in use, the driving structure 20 drives the transmission structure 30 to perform horizontal linear reciprocating motion. When the transmission structure 30 performs horizontal reciprocating motion, it drives the swing block 41 to swing. When the swing block 41 swings, it drives the first transmission rod 423 to rotate. When the first transmission rod 423 rotates, it drives the first transmission arm 422 and the second transmission arm 426 to rotate, so that the first transmission arm 422 and the second transmission arm 426 are higher at one end and lower at the other end, driving the linkage structure 42 to perform lifting motion. The linkage structure 42 drives the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70 to move closer to and away from each other, thereby realizing the opening and closing of the upper sealing and cutting assembly 60 and the lower sealing and cutting assembly 70.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the above embodiments, or to make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing machine, characterized in that, The sealing machine includes: a fixed frame, a driving structure arranged on the fixed frame, a transmission structure movably arranged on the output end of the driving structure, a first swinging mechanism movably arranged on one end of the transmission structure, a second swinging mechanism movably arranged on the other end of the transmission structure, an upper sealing and cutting assembly respectively arranged on one end of the first swinging mechanism and one end of the second swinging mechanism, and a lower sealing and cutting assembly respectively arranged on the other end of the first swinging mechanism and the other end of the second swinging mechanism, and the lower sealing and cutting assembly is located within the orthographic projection range of the upper sealing and cutting assembly. The driving structure drives the transmission structure to drive the first swinging mechanism and the second swinging mechanism to move, and at the same time drives the upper sealing and cutting assembly and the lower sealing and cutting assembly to open and close.

2. The sealing machine according to claim 1, characterized in that The transmission structure is a strip-shaped structure, the first swing mechanism is hinged to one end of the strip-shaped structure, and the second swing mechanism is hinged to the other end of the strip-shaped structure.

3. The sealing machine according to claim 1, characterized in that The first swing mechanism and the second swing mechanism have the same structure. The first swing mechanism includes a swing block and a linkage structure. The swing block is hinged to the transmission structure. The linkage structure is fixed to the swing block. The linkage structure is movably arranged on the fixed frame.

4. The sealing machine according to claim 3, characterized in that The transmission structure is provided with a through slot, one end of the swing block is inserted into and hinged in the through slot, and the other end of the swing block is sleeved on the linkage structure, and the through slot is a bar-shaped hole.

5. The sealing machine according to claim 3, characterized in that The linkage structure includes a first long connecting rod, a first short connecting rod, a first transmission arm and a first transmission rod. The first transmission rod can be rotatably arranged horizontally on both sides of the fixed frame. The first transmission arm is sleeved on one end of the first transmission rod. One end of the first long connecting rod is arranged on the end of the first transmission arm close to the driving structure. The other end of the first long connecting rod is arranged on the upper sealing and cutting assembly. One end of the first short connecting rod is arranged on the other end of the first transmission arm. The other end of the first short connecting rod is arranged on the lower sealing and cutting assembly.

6. The sealing machine according to claim 5, characterized in that The linkage structure also includes a second long connecting rod, a second short connecting rod and a second transmission arm. The second transmission arm is sleeved on the other end of the first transmission rod, the second long connecting rod is arranged on one end of the second transmission arm close to the driving structure, the other end of the first long connecting rod is arranged on the upper sealing and cutting assembly, one end of the first short connecting rod is arranged on the other end of the second transmission arm, and the other end of the first short connecting rod is arranged on the lower sealing and cutting assembly.

7. The sealing machine according to claim 1, characterized in that The sealing machine also includes a guide structure, which includes a first guide block, a second guide block and a guide column. The first guide block is arranged on the upper sealing and cutting assembly, and the second guide block is arranged on the lower sealing and cutting assembly. One end of the guide column passes through the first guide block and the second guide block in sequence and is arranged on the fixed frame.

8. The sealing machine according to claim 1, characterized in that The upper sealing and cutting assembly includes a first fixed seat and a sealing and cutting knife. The first swing mechanism is arranged on both sides of the first fixed seat, and the second swing mechanism is arranged on both sides of the first fixed seat. The first swing mechanism and the second swing mechanism are respectively located at both ends of the first fixed seat. The sealing and cutting knife is arranged on the first fixed seat, and the blade of the sealing and cutting knife is arranged toward the side of the lower sealing and cutting assembly.

9. The sealing machine according to claim 8, characterized in that The lower sealing and cutting assembly includes a knife seat and a second fixed seat, the first swing mechanism is arranged on both sides of the second fixed seat, the second swing mechanism is arranged on both sides of the second fixed seat, and the first swing mechanism and the second swing mechanism are respectively located at both ends of the second fixed seat, and the knife seat is arranged on the second fixed seat, and the knife seat is arranged toward the side of the sealing and cutting knife.

10. The sealing machine according to claim 4, characterized in that The transmission structure is provided with a first through hole that passes through the through slot, and one end of the swing block is provided with a second through hole corresponding to the first through hole. The first swing mechanism also includes a fastener, which passes through the first through hole and the second through hole in sequence and is arranged on the transmission structure.

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