Labeling head with self-adapting arc surface

Abstract

The application discloses a self-adaptive circular arc surface labeling head and relates to the technical field of labeling equipment.The self-adaptive circular arc surface labeling head comprises two adsorption plates, a same top plate arranged above the two adsorption plates, side mounting plates fixed to the top of the top plate, the side mounting plates being rotationally connected with the adsorption plates located below the side mounting plates, a certain spacing existing between the two adsorption plates, a pull plate arranged in the spacing, two pull mechanisms mounted on the adsorption plates, four pull mechanisms being connected with the same pull plate, a handle fixed to the top of the top plate, a gear mounted at the bottom of the handle, a gear rod fixed to the top of the pull plate and engaged with the gear, a through groove formed in the top of the top plate, a ratchet wheel connected with the gear through a shaft rod, a pushing mechanism mounted on the shaft rod and used for rotating the ratchet wheel, and a limiting mechanism mounted at the bottom of the handle and used for limiting the ratchet wheel.The self-adaptive circular arc surface labeling head can selectively label the surface of a circular arc product and the surface of a planar product, has high self-adaptive capacity and can restore the original state after use.

Description

Technical Field

[0001] This invention relates to the field of labeling equipment technology, and more particularly to a labeling head with an adaptive arc surface. Background Technology

[0002] Before products leave the factory, they all need to be labeled. The main purpose of labeling products is to distinguish different products, provide information about the manufacturer, help customers recognize and purchase products, and at the same time increase the added value of products and promotional channels. Different products have different shapes. Currently, labeling heads used for labeling are mostly used for flat parts. Labeling equipment is also often used in the production and labeling of pet products.

[0003] In the actual production of pet supplies, many curved products need to be labeled, and the size of the curves varies. Generally, labels are applied manually, but manual labeling is time-consuming and troublesome, and the label is prone to sticking to the hand due to improper operation. In order to adapt to curved products of different sizes and effectively label curved products, we have designed an adaptive curved surface labeling head. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an adaptive arc-shaped labeling head.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The self-adaptive arc-shaped labeling head includes two adsorption plates, with a common top plate directly above them. Side mounting plates are fixed to both sides of the top of the top plate, and each side mounting plate is rotatably connected to the adsorption plate directly below it. A certain distance exists between the two adsorption plates, and a pull plate is installed within this distance. Two pulling mechanisms are mounted on each adsorption plate, and four pulling mechanisms are connected to the same pull plate. A handle is fixed to the top of the top plate, and a gear is mounted at the bottom of the handle. A toothed rod that meshes with the gear is fixed to the top of the pull plate, and a through slot is provided at the top of the top plate. A ratchet is connected to the gear via a shaft, and a pushing mechanism for rotating the ratchet is mounted on the shaft. A limiting mechanism for limiting the ratchet's position is mounted at the bottom of the handle.

[0006] As a further embodiment of the present invention, several vacuum inlet connectors are installed on the opposite sides of the two adsorption plates. An adsorption channel communicating with the vacuum inlet connector is opened at the bottom of the adsorption plate. High-density sponge is fixed to the bottom of both the adsorption plate and the bottom of the pull plate. Two symmetrical fixing ears are fixed to the top of the adsorption plate. The side mounting plate is rotatably set between the corresponding two fixing ears by a pin. The side mounting plate is connected to the adsorption plate located directly below by two symmetrical tension springs. The label can be adsorbed on the bottom of the high-density sponge. The entire device moves close to the product and moves to the product labeling position. After pressing down and contacting the product, the two adsorption plates are subjected to force and begin to rotate around the side mounting plate around the arc-shaped outer wall of the product to complete the arc-shaped labeling. After the labeling is completed, the module is lifted, and the adsorption plates return to their original positions under the action of the tension springs.

[0007] As a further embodiment of the present invention, a through hole is provided at the top of the handle bar, and the toothed rod is disposed through the through hole.

[0008] As a further embodiment of the present invention, the pushing mechanism includes a pushing arm, the bottom of which is fixed with a collar sleeved on a shaft, a first pawl rotatably provided on the outer wall of the pushing arm and adapted to a ratchet, a mounting bracket fixed on the outer wall of the pushing arm, and a telescopic component installed between the mounting bracket and the first pawl. By holding the handle and pushing the pushing mechanism, the two adsorption plates are rotated by pressing, causing the two adsorption plates to be subjected to force and begin to rotate around the side mounting plate around the arc-shaped outer wall of the product, thus completing the arc-shaped attachment.

[0009] As a further embodiment of the present invention, the telescopic member includes a sleeve rod, a plug rod, and a second spring. The sleeve rod is rotatably disposed on the outer wall of the first pawl, the plug rod is located inside the sleeve rod, one end of the second spring is fixed to the inner wall of the sleeve rod, the other end of the second spring is fixed to the end face of the plug rod, and the other end of the plug rod is rotatably connected to the outer wall of the mounting bracket.

[0010] As a further embodiment of the present invention, the bottom of the handle is fixed with two connecting arms, the gear is rotatably disposed between the two connecting arms, the connecting arms are provided with holes for the shaft to pass through, the outer wall of the connecting arm is fixed with a torsion spring, and the other end of the torsion spring is fixed with a collar.

[0011] As a further embodiment of the present invention, the limiting mechanism includes a mounting workpiece fixed to the outer wall of the connecting arm. The outer wall of the mounting workpiece is rotatably provided with a second pawl, and the second pawl is adapted to a ratchet. The outer wall of the mounting workpiece is fixed with a first spring, and the other end of the first spring is fixed to the second pawl. The outer wall of the second pawl is fixed with a lever. The limiting mechanism includes a mounting workpiece, a second pawl, a first spring, and a lever. The second pawl connected to the first spring can limit the ratchet, preventing it from rotating clockwise. When the lever is manually moved, the second pawl disengages from the ratchet, releasing the restriction on the ratchet. Under the action of the tension spring, the adsorption plate returns to its original position. At the same time, the pull plate moves down and is located between the two adsorption plates.

[0012] As a further embodiment of the present invention, the pulling mechanism includes a U-shaped frame fixed to the top of the pull plate and a U-shaped limiting frame fixed to the top of the adsorption plate. A pull rod is rotatably arranged inside the U-shaped frame, and a limiting slider is rotatably arranged at the other end of the pull rod. Both ends of the limiting slider are fixed with sliding heads. The limiting slider is slidably arranged inside the U-shaped limiting frame. When the pull plate moves upward, the pull plate drives the limiting slider to move within the U-shaped limiting frame. When the pull plate is completely separated from the two adsorption plates, the limiting slider drives the U-shaped limiting frame to move, so that the adsorption plate is tilted, achieving the effect of the pull plate moving upward first and then the adsorption plate tilting.

[0013] The beneficial effects of this invention are as follows: This invention utilizes an adsorption plate, a top plate, a side mounting plate, a vacuum inlet connector, and high-density sponge. As the device moves close to the product, it presses the label against the product's curved outer wall, effectively solving the problem of labeling products with curved surfaces, as mentioned in the prior art. Furthermore, the two adsorption plates are forced to rotate around the side mounting plate around the curved outer wall of the product, completing the curved labeling process. After labeling, the module lifts, and the adsorption plates return to their original positions under the action of tension springs. This invention employs a pull plate, a rack, a pulling mechanism, gears, a ratchet, a pushing mechanism, and a limiting mechanism. By holding the handle and using the thumb to push the pushing arm, the pull plate moves the limiting slider within the U-shaped limiting frame. When the pull plate is completely disengaged from the two adsorption plates, the limiting slider moves the U-shaped limiting frame, causing the adsorption plates to tilt. Alternatively, by holding the handle and pushing the pushing mechanism, the two adsorption plates are rotated, causing them to rotate around the side mounting plate along the product's arc-shaped outer wall, completing the arc-shaped attachment. Without pulling the pull plate, the adsorption plates and pull plate are on the same horizontal plane, enabling label attachment to flat products. This invention employs a limiting mechanism, allowing the second pawl connected to the first spring to limit the ratchet's rotation, preventing it from turning clockwise. When the lever is manually moved, the second pawl disengages from the ratchet, releasing the ratchet's restriction. Under the action of the tension spring, the adsorption plate returns to its original position, and simultaneously, the pull plate moves downward, positioning itself between the two adsorption plates. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first three-dimensional structure of the adaptive arc surface labeling head proposed in this invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the adaptive arc surface labeling head proposed in this invention; Figure 3 This is a partial three-dimensional structural diagram of the adsorption plate of the adaptive arc surface labeling head proposed in this invention; Figure 4 The adaptive arc surface labeling head proposed in this invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 5 This is a partial three-dimensional structural diagram of the handle of the adaptive arc surface labeling head proposed in this invention; Figure 6 This is a partial three-dimensional structural diagram of the pull plate of the adaptive arc surface labeling head proposed in this invention; Figure 7 This is a partial three-dimensional structural diagram of the pushing mechanism of the adaptive arc surface labeling head proposed in this invention.

[0015] In the diagram: 1. Adsorption plate; 2. Top plate; 201. Through slot; 3. Side mounting plate; 4. Vacuum inlet connector; 5. High-density sponge; 6. Fixing ear; 7. Tension spring; 8. Pull plate; 9. Gear rack; 10. Gear; 11. Ratchet; 12. Pushing mechanism; 121. Pushing arm; 122. First pawl; 123. Mounting bracket; 124. Telescopic component; 13. Limiting mechanism; 131. Mounting workpiece; 132. Second pawl; 133. First spring; 134. Pulley; 14. Collar; 15. Shaft; 16. Torsion spring; 17. Handle; 171. Through hole; 18. Pulling mechanism; 181. U-shaped frame; 182. U-shaped limiting frame; 183. Pull rod; 184. Limiting slider; 19. Connecting arm. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Reference Figure 1-7 The self-adaptive arc-shaped labeling head includes two adsorption plates 1. A top plate 2 is set directly above the two adsorption plates 1. Side mounting plates 3 are fixed on both sides of the top of the top plate 2. The side mounting plates 3 are rotatably connected to the adsorption plates 1 located directly below them. There is a certain gap between the two adsorption plates 1, and a pull plate 8 is set within the gap. Two pulling mechanisms 18 are installed on the adsorption plates 1. Four pulling mechanisms 18 are connected to the same pull plate 8. A handle 17 is fixed on the top of the top plate 2. A gear 10 is installed at the bottom of the handle 17. A toothed rod 9 that meshes with the gear 10 is fixed on the top of the pull plate 8. A through slot 201 is opened on the top of the top plate 2. A ratchet 11 is connected and fixed to the gear 10 through a shaft 15. A pushing mechanism 12 that realizes the rotation of the ratchet 11 is installed on the shaft 15. A limiting mechanism 13 that limits the ratchet 11 is installed at the bottom of the handle 17.

[0019] In this embodiment, several vacuum inlet connectors 4 are installed on the opposite sides of the two adsorption plates 1. The bottom of the adsorption plate 1 has an adsorption channel communicating with the vacuum inlet connectors 4. High-density sponge 5 is fixed to the bottom of the adsorption plate 1 and the bottom of the pull plate 8. Two symmetrical fixing ears 6 are fixed to the top of the adsorption plate 1. The side mounting plate 3 is rotatably set between the corresponding two fixing ears 6 by a pin. The side mounting plate 3 is connected to the adsorption plate 1 located directly below by two symmetrical tension springs 7. The label can be adsorbed on the bottom of the high-density sponge 5. The whole device moves close to the product and moves to the product labeling position. After the whole device is pressed down and comes into contact with the product, the two adsorption plates 1 are subjected to force and begin to rotate around the side mounting plate 3 around the arc-shaped outer wall of the product to complete the arc-shaped labeling. After the labeling is completed, the module is lifted and the adsorption plates 1 return to their original position under the action of the tension springs 7.

[0020] In this embodiment, a through hole 171 is provided at the top of the handle 17, and the toothed bar 9 is disposed through the through hole 171.

[0021] In this embodiment, the pushing mechanism 12 includes a pushing arm 121. A collar 14 sleeved on the shaft 15 is fixed at the bottom of the pushing arm 121. A first pawl 122 is rotatably provided on the outer wall of the pushing arm 121, and the first pawl 122 is adapted to the ratchet 11. A mounting bracket 123 is fixed on the outer wall of the pushing arm 121. The same telescopic member 124 is installed between the mounting bracket 123 and the first pawl 122. By holding the handle 17 and pushing the pushing mechanism 12, the two adsorption plates 1 are rotated by pressing, so that the two adsorption plates 1 are subjected to force and begin to rotate around the side mounting plate 3 around the arc-shaped outer wall of the product, thus completing the arc-shaped attachment.

[0022] In this embodiment, the telescopic member 124 includes a sleeve rod, an insert rod, and a second spring. The sleeve rod is rotatably disposed on the outer wall of the first pawl 122, the insert rod is located inside the sleeve rod, one end of the second spring is fixed to the inner wall of the sleeve rod, the other end of the second spring is fixed to the end face of the insert rod, and the other end of the insert rod is rotatably connected to the outer wall of the mounting bracket 123.

[0023] In this embodiment, two connecting arms 19 are fixed at the bottom of the handle 17, and the gear 10 is rotatably disposed between the two connecting arms 19. The connecting arms 19 have holes for the shaft 15 to pass through, and a torsion spring 16 is fixed on the outer wall of the connecting arm 19. The other end of the torsion spring 16 is fixed to the collar 14.

[0024] In this embodiment, the limiting mechanism 13 includes a mounting workpiece 131 fixed to the outer wall of the connecting arm 19. A second pawl 132 is rotatably provided on the outer wall of the mounting workpiece 131, and the second pawl 132 is adapted to the ratchet 11. A first spring 133 is fixed on the outer wall of the mounting workpiece 131, and the other end of the first spring 133 is fixed to the second pawl 132. A lever 134 is fixed on the outer wall of the second pawl 132. The limiting mechanism 13 includes the mounting workpiece 131, the second pawl 132, the first spring 133, and the lever 134. The second pawl 132 connected to the first spring 133 can limit the ratchet 11 so that it will not rotate clockwise. When the lever 134 is manually moved, the second pawl 132 is disengaged from the ratchet 11, releasing the restriction on the ratchet 11. Under the action of the tension spring 7, the adsorption plate 1 returns to its original position. At the same time, the pull plate 8 moves down and is located between the two adsorption plates 1.

[0025] In this embodiment, the pulling mechanism 18 includes a U-shaped frame 181 fixed to the top of the pull plate 8 and a U-shaped limiting frame 182 fixed to the top of the adsorption plate 1. A pull rod 183 is rotatably arranged inside the U-shaped frame 181, and a limiting slider 184 is rotatably arranged at the other end of the pull rod 183. Both ends of the limiting slider 184 are fixed with slider heads. The limiting slider 184 is slidably arranged inside the U-shaped limiting frame 182. When the pull plate 8 moves upward, the pull plate 8 drives the limiting slider 184 to move within the U-shaped limiting frame 182. When the pull plate 8 is completely separated from the two adsorption plates 1, the limiting slider 184 drives the U-shaped limiting frame 182 to move, so that the adsorption plate 1 is tilted, that is, the pull plate 8 moves upward first, and then the adsorption plate 1 is tilted.

[0026] Working principle: The device uses an adsorption plate 1, a top plate 2, a side mounting plate 3, a vacuum inlet connector 4, and a high-density sponge 5. A handle 17 is fixed on the top of the top plate 2. The side mounting plate 3 is rotatably connected to the adsorption plate 1 and connected by two tension springs 7. In use, the vacuum inlet connector 4 is connected to a suction pump, so that the label can be adsorbed on the bottom of the high-density sponge 5. The entire device moves close to the product and moves to the product labeling area. After pressing down and contacting the product, the two adsorption plates 1 are subjected to force and begin to rotate around the side mounting plate 3 around the arc-shaped outer wall of the product to complete the arc-shaped labeling. After the labeling is completed, the module is lifted, and the adsorption plates 1 return to their original position under the action of the tension springs 7. Furthermore, the present invention provides a pull plate 8 between the two adsorption plates 1, and a high-density sponge 5 is also provided at the bottom of the pull plate 8. The pull plate 8 can fill the gap between the two adsorption plates 1. Since it is adsorbed neatly with the label at the bottom of the two high-density sponges 5, a toothed rod 9 is provided at the top of the pull plate 8. A pulling mechanism 18 is provided between the pull plate 8 and the adsorption plates 1. A gear 10 and a ratchet 11 are provided below the handle 17, and a pushing mechanism 12 for the auxiliary ratchet 11 is also provided. The limiting mechanism 13 includes a pushing mechanism 12 comprising a pushing arm 121, a first pawl 122, a mounting bracket 123, and a telescopic member 124. The pushing arm 121 is connected to the connecting arm 19 via a collar 14 and a torsion spring 16. By gripping the handle 17 and pushing the pushing arm 121 with the thumb, the first pawl 122 supported by the telescopic member 124 can push the ratchet 11 meshing with it to rotate counterclockwise, thereby causing the rack 9 to move upward and pulling the pull plate 8 upward. At this time, the pull plate 8 drives the limiting mechanism. The slider 184 moves within the U-shaped limiting frame 182. When the pull plate 8 is completely disengaged from the two adsorption plates 1, the limiting slider 184 drives the U-shaped limiting frame 182 to move, causing the adsorption plates 1 to tilt. In this way, by holding the handle 17 and pushing the pushing mechanism 12, the two adsorption plates 1 are rotated by pressing, causing them to be subjected to force and begin to rotate around the side mounting plate 3 around the arc-shaped outer wall of the product, thus completing the arc attachment. Furthermore, a limiting mechanism 13 is provided, which includes the mounting workpiece 131, the second pawl 132, the first spring 133, and the lever 134. The second pawl 132 connected to the first spring 133 can limit the ratchet 11, preventing it from rotating clockwise. When the lever 134 is manually moved, the second pawl 132 disengages from the ratchet 11, releasing the restriction on the ratchet 11. Under the action of the tension spring 7, the adsorption plate 1 returns to its original position, and at the same time, the pull plate 8 moves down and is located between the two adsorption plates 1.

[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A labeling head with adaptive arc surface, comprising two adsorption plates (1), the same top plate (2) is arranged above the two adsorption plates (1), the top plate (2) is fixed with a side mounting plate (3) on both sides of the top, and the side mounting plate (3) is rotationally connected with the adsorption plate (1) located below the side mounting plate (3), characterized in that, There is a certain gap between the two adsorption plates (1), and a pull plate (8) is provided within the gap. Two pulling mechanisms (18) are installed on the adsorption plates (1). The four pulling mechanisms (18) are connected to the same pull plate (8). A handle (17) is fixed on the top of the top plate (2). A gear (10) is installed at the bottom of the handle (17). A toothed rod (9) that meshes with the gear (10) is fixed on the top of the pull plate (8). A through groove (201) is opened on the top of the top plate (2). A ratchet (11) is connected and fixed to the gear (10) through a shaft (15). A pushing mechanism (12) that realizes the rotation of the ratchet (11) is installed on the shaft (15). A limiting mechanism (13) that limits the ratchet (11) is installed at the bottom of the handle (17).

2. The self-adaptive arc-shaped labeling head according to claim 1, characterized in that, Several vacuum inlet connectors (4) are installed on the side of the two adsorption plates (1) that are far apart from each other. An adsorption channel communicating with the vacuum inlet connector (4) is opened at the bottom of the adsorption plate (1). High-density sponge (5) is fixed at the bottom of the adsorption plate (1) and the bottom of the pull plate (8).

3. The self-adaptive arc-shaped labeling head according to claim 2, characterized in that, The top of the adsorption plate (1) is fixed with two symmetrical fixing ears (6), and the side mounting plate (3) is rotatably set between the two corresponding fixing ears (6) by means of a pin.

4. The labeling head for an adaptive arc surface according to claim 3, characterized in that, The side mounting plate (3) is connected to the adsorption plate (1) located directly below by two symmetrical tension springs (7).

5. The self-adaptive arc-shaped labeling head according to claim 4, characterized in that, The top of the handle (17) has a through hole (171), and the toothed rod (9) is installed through the through hole (171).

6. The labeling head for an adaptive arc surface according to claim 5, characterized in that, The pushing mechanism (12) includes a pushing arm (121), the bottom of which is fixed with a collar (14) sleeved on the shaft (15). The outer wall of the pushing arm (121) is rotatably provided with a first pawl (122), which is adapted to the ratchet (11). The outer wall of the pushing arm (121) is fixed with a mounting bracket (123), and the same telescopic component (124) is installed between the mounting bracket (123) and the first pawl (122).

7. The self-adaptive arc-shaped labeling head according to claim 6, characterized in that, The telescopic component (124) includes a sleeve rod, a plug rod, and a second spring. The sleeve rod is rotatably disposed on the outer wall of the first pawl (122). The plug rod is located inside the sleeve rod. One end of the second spring is fixed to the inner wall of the sleeve rod, and the other end of the second spring is fixed to the end face of the plug rod. The other end of the plug rod is rotatably connected to the outer wall of the mounting bracket (123).

8. The labeling head for an adaptive arc surface according to claim 7, characterized in that, The bottom of the handle (17) is fixed with two connecting arms (19), and the gear (10) is rotatably disposed between the two connecting arms (19). The connecting arms (19) have holes for the shaft (15) to pass through. The outer wall of the connecting arm (19) is fixed with a torsion spring (16), and the other end of the torsion spring (16) is fixed with a collar (14).

9. The labeling head for an adaptive arc surface according to claim 8, characterized in that, The limiting mechanism (13) includes a mounting workpiece (131) fixed to the outer wall of the connecting arm (19). The outer wall of the mounting workpiece (131) is rotatably provided with a second pawl (132), and the second pawl (132) is adapted to the ratchet (11). The outer wall of the mounting workpiece (131) is fixed with a first spring (133), and the other end of the first spring (133) is fixed to the second pawl (132). The outer wall of the second pawl (132) is fixed with a paddle block (134).

10. The labeling head for an adaptive arc surface according to claim 9, characterized in that, The pulling mechanism (18) includes a U-shaped frame (181) fixed to the top of the pull plate (8) and a U-shaped limiting frame (182) fixed to the top of the adsorption plate (1). A pull rod (183) is rotatably arranged inside the U-shaped frame (181). A limiting slider (184) is rotatably arranged at the other end of the pull rod (183). Both ends of the limiting slider (184) are fixed with slider heads. The limiting slider (184) is slidably arranged inside the U-shaped limiting frame (182).

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