Binding machine and accessory thereof

Abstract

The invention relates to the technical field of strapping, in particular to a strapping machine and accessories thereof.The strapping machine comprises a rack and a supporting tray, three-dimensional stacked packaging boxes are placed in the supporting tray, a strapping assembly is arranged on the rack and comprises a horizontally-arranged sliding plate, and the sliding plate can slide up and down along the rack; a rotating ring is rotationally arranged on the sliding plate, and a plurality of roller assemblies are arranged on the inner wall of the rotating ring in the circumferential direction; the rolling wheel assembly comprises a supporting arm, a winding roller, a gluing and cutting roller and a pressing roller are rotationally arranged on the supporting arm, and the winding roller, the gluing and cutting roller and the pressing roller are sequentially arranged from the inner wall of the rotating ring to the axis direction of the rotating ring; a bundling film is wound on the winding roller, and the bundling film is wound on the pressing roller after bypassing the gluing cutting roller; the gluing and cutting roller is used for gluing and cutting off the binding film; and the compression roller can compress the glued binding film to the surface of the three-dimensional stacked packaging box, so that multiple rows of packaging boxes can be bound at a time.

Description

Technical Field

[0001] The present invention relates to the technical field of bundling, in particular to a bundling machine and accessories thereof. Background Art

[0002] In standardized production sectors like pharmaceuticals and food, products must be packaged in individual boxes before leaving the factory. These boxes are numerous and scattered, making them difficult to stack and transport. To improve transportation efficiency, the industry generally uses film strapping to stack and bundle multiple scattered products, facilitating centralized, large-scale transportation.

[0003] However, the existing medicine box bundling device can only bundle medicine boxes arranged in rows, and the rows of medicine boxes need to be stacked into cubes later, resulting in low bundling efficiency. Summary of the Invention

[0004] Based on this, it is necessary to provide a strapping machine and its accessories to address the technical problem that the current strapping machine can only strap medicine boxes in rows.

[0005] The above purpose is achieved through the following technical solutions: A strapping machine comprises a frame and a supporting tray, wherein a three-dimensional stacking packaging box is placed in the supporting tray, and a pressure plate that slides in an up-and-down direction is provided on the frame, and the pressure plate is used to press the top surface of the three-dimensional stacking packaging box; a strapping assembly is provided on the frame, and the strapping assembly comprises a horizontally arranged sliding plate, which can slide up and down along the frame, and a rotating ring is rotatably provided on the sliding plate, and the interior of the rotating ring corresponds to the exterior of the three-dimensional stacking packaging box; a plurality of groups of roller assemblies are provided on the inner wall of the rotating ring in a circumferential direction; the roller assembly comprises a supporting arm, which extends along the radial direction of the rotating ring, and a winding roller, a gluing and cutting roller and a pressure roller are rotatably provided on the supporting arm, and the winding roller, The gluing and cutting roller and the pressing roller are arranged in sequence from the inner wall of the rotating ring to the axial direction of the rotating ring; in the initial state, the axes of the winding roller, the gluing and cutting roller and the pressing roller all extend in the up-down direction; the winding roller is wound with a strapping film, and the strapping film is wound around the gluing and cutting roller and then wound on the pressing roller; the gluing and cutting roller is used to glue and cut the strapping film; the pressing roller can press the glued strapping film to the surface of the three-dimensional stacking packaging box; when the sliding plate slides from top to bottom, the rotating ring rotates synchronously around the outside of the three-dimensional stacking packaging box, so that multiple pressing rollers strap the surface of the three-dimensional stacking packaging box from top to bottom, and after strapping is completed, the gluing and cutting roller cuts the strapping film.

[0006] Furthermore, the support arm includes a detachably connected sliding rod and a rotating arm, the sliding rod can slide radially along the rotating ring, the winding roller, the gluing and cutting roller and the pressure roller are all located on the rotating arm, and the rotating arm can rotate around the circumferential direction of the sliding rod.

[0007] Furthermore, the sliding plate is provided with an annular groove, and a slider is provided on the end of the sliding rod away from the rotating arm. The rotation of the rotating ring drives the sliding rod to rotate synchronously, so that the slider slides along the annular groove; the annular groove includes four sections of arc-shaped gradient grooves connected to each other, each section of the arc-shaped gradient groove corresponds to a side surface of the three-dimensional stacking packaging box, and the two end positions of the arc-shaped gradient groove correspond to the right angles of the three-dimensional stacking packaging box respectively, and the distance between the two end positions of the arc-shaped gradient groove and the axis of the rotating ring is the largest, and the distance between the middle position of the arc-shaped gradient groove and the axis of the rotating ring is the smallest.

[0008] Furthermore, push plates are respectively provided on the left and right sides of the frame, and the push plates are L-shaped. The two push plates are symmetrically arranged on the left and right sides. The two push plates can approach or move away from each other in the horizontal direction. The approach of the two push plates can tighten the sides of the three-dimensional stacking packaging boxes in the supporting tray.

[0009] Furthermore, a storage cavity is provided inside the glue-coating and cutting roller, and glue is stored in the storage cavity; a glue outlet hole is provided on the surface of the glue-coating and cutting roller, and the glue outlet hole is used to apply glue to the strapping film.

[0010] Furthermore, the glue coating and cutting roller is provided with a receiving groove, which extends along the axial direction of the glue coating and cutting roller, and a cutting knife is provided in the receiving groove, and the cutting knife has a blade, which extends along the length direction of the receiving groove; in the initial state, the lower end of the cutting knife extends from the receiving groove, and the blade of the cutting knife is located in the receiving groove, and the support tray is provided with driving blocks, and the number of the driving blocks is consistent with the number of the glue coating and cutting rollers. When the glue coating and cutting roller moves down to the lower end of the cutting knife and contacts the driving block, the cutting knife can slide upward along the receiving groove and slide along the radial direction of the glue coating and cutting roller, so that its blade extends from the receiving groove.

[0011] Furthermore, the cutting knife is provided with at least two parallel inclined grooves, the inclined grooves have a certain angle with the axis of the glue coating and cutting roller, and the accommodating groove is provided with a fixed shaft, which is in sliding fit with the inclined grooves.

[0012] Furthermore, a gear ring is provided on the outside of the rotating ring, a first drive motor is fixedly provided on the sliding plate, and a rotating gear is provided at the output end of the first drive motor, and the rotating gear is meshed with the gear ring.

[0013] Furthermore, the sliding plate is provided with four threaded holes, the frame is provided with four screws extending in the up and down directions, the sliding plate is connected to the four screws by threads, and the frame is also provided with a second drive motor, and the rotation of the second drive motor can drive the four screws to rotate synchronously.

[0014] An accessory of a strapping machine, applied to the above-mentioned strapping machine, comprises a conveyor belt, wherein the conveyor belt is used to transport a supporting tray to the bottom of a frame and to make the outside of the three-dimensionally stacked packaging boxes correspond to the inside of a rotating ring.

[0015] The beneficial effects of the present invention are: The strapping machine provided by the present invention can strap multiple rows of packaging boxes at a time, thereby improving strapping efficiency; at the same time, after the strapping film is coated with glue, the strapping of the three-dimensional stacked packaging boxes is more secure, making them less likely to scatter and facilitating subsequent transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a strapping machine and its accessories provided in one embodiment of the present invention; Figure 2 A side view of a strapping machine provided in one embodiment of the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 for Figure 2 Middle BB cross-section; Figure 5 A front view of a strapping machine provided in one embodiment of the present invention; Figure 6 for Figure 5 Middle CC section view; Figure 7 for Figure 5 Middle DD section view; Figure 8 for Figure 5 Middle EE cross-sectional view; Figure 9 A schematic structural diagram of a strapping assembly in a strapping machine provided in one embodiment of the present invention; Figure 10 A schematic diagram of the three-dimensional structure of a gluing and cutting roller in a strapping machine provided in one embodiment of the present invention; Figure 11 A front view of a gluing and cutting roller in a strapping machine according to an embodiment of the present invention; Figure 12 for Figure 11 Middle FF cross-sectional view; Figure 13 for Figure 3 A magnified view of the structure at G in the middle; Figure 14 for Figure 6 A magnified view of the structure at H in the middle; Figure 15 for Figure 9 A magnified view of the structure at position I in the middle; Figure 16 for Figure 5Middle ZZ section view.

[0017] in: 100, conveyor belt; 201, frame; 202, first telescopic cylinder; 203, mounting plate; 204, second telescopic cylinder; 205, push plate; 206, pressure plate; 207, second drive motor; 208, second gear; 209, screw; 210, drive gear; 211, transmission belt; 300, strapping assembly; 301, sliding plate; 3011, arc-shaped gradient groove; 3012, threaded hole; 302, rotating ring; 303, first drive motor; 304, sliding Block; 305, rotating arm; 3051, first mounting bracket; 3052, second mounting bracket; 306, winding roller; 307, gluing and cutting roller; 3071, cutting knife; 30711, inclined slot; 30712, fixed shaft; 3072, glue outlet hole; 3073, storage chamber; 308, pressing roller; 309, strapping film; 310, compression spring; 311, sliding rod; 312, gear ring; 400, support tray; 401, driving block; 402, three-dimensional stacking packaging box. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0021] like Figures 1 to 16 As shown, a strapping machine provided by an embodiment of the present invention includes a frame 201 and a support tray 400, wherein a three-dimensional stacked packaging box 402 is placed in the support tray 400, and the three-dimensional stacked packaging box 402 is formed by stacking multiple rows of packaging boxes, and a pressure plate 206 that slides in the up and down direction is provided on the frame 201, and the pressure plate 206 is used to press the top surface of the three-dimensional stacked packaging box 402; a strapping assembly 300 is provided on the frame 201, and the strapping assembly 300 includes a horizontally arranged sliding plate 301, and the sliding plate 301 can slide up and down along the frame 201, and a rotating ring 302 is rotatably provided on the sliding plate 301, and the interior of the rotating ring 302 corresponds to the exterior of the three-dimensional stacked packaging box 402; the inner wall of the rotating ring 302 is provided with multiple groups of roller assemblies around the circumferential direction; the roller assembly includes a support arm, which extends along the radial direction of the rotating ring 302, and a winding roller 306, a gluing and cutting roller 30 are rotatably provided on the support arm. 7 and the pressing roller 308, the winding roller 306, the gluing and cutting roller 307 and the pressing roller 308 are arranged in sequence from the inner wall of the rotating ring 302 to the axis direction of the rotating ring 302; in the initial state, the axes of the winding roller 306, the gluing and cutting roller 307 and the pressing roller 308 all extend in the up-down direction; a strapping film 309 is wound around the winding roller 306, and the strapping film 309 is wound around the gluing and cutting roller 307 and then wound around the pressing roller 308; the gluing and cutting roller 307 The pressing rollers 308 are used to apply glue to and cut the strapping film 309. The pressing rollers 308 can press the glued strapping film 309 against the surface of the three-dimensional stacking packaging box 402. As the sliding plate 301 slides from top to bottom, the rotating ring 302 rotates synchronously around the exterior of the three-dimensional stacking packaging box 402, causing the multiple pressing rollers 308 to strap the three-dimensional stacking packaging box 402 from top to bottom. After strapping is completed, the gluing and cutting rollers 307 cut the strapping film 309. The strapping film 309 is a transparent PE heat-shrinkable film.

[0022] In this way, multiple rows of packaging boxes can be bundled at one time, thereby improving the bundling efficiency. At the same time, after being coated with glue, the bundling film 309 can bundle the three-dimensional stacked packaging boxes 402 more firmly, making them less likely to scatter and facilitating subsequent transportation.

[0023] Specifically, such as Figure 3 As shown, a first telescopic cylinder 202 is provided on the frame 201, and a pressing plate 206 is provided on the output end of the first telescopic cylinder 202. The extension and contraction of the first telescopic cylinder 202 drives the pressing plate 206 to move up and down. Figure 15 As shown, the support arm is provided with a first mounting bracket 3051 and a second mounting bracket 3052, the winding roller 306 and the gluing and cutting roller 307 are rotatably set on the first mounting bracket 3051, the pressure roller 308 is rotatably set on the second mounting bracket 3052, the second mounting bracket 3052 is provided with a slide, and a rotating shaft is provided at both ends of the pressure roller 308, and a compression spring 310 is provided between the rotating shaft and the slide. When the pressure roller 308 moves to a right-angle position of the three-dimensional stacking packaging box 402, the compression spring 310 can contract to reduce the rotation resistance of the pressure roller 308.

[0024] Further, such as Figure 13 As shown, the support arm includes a detachably connected slide bar 311 and a rotating arm 305. The slide bar 311 can slide radially along the rotating ring 302. The winding roller 306, the gluing and cutting roller 307, and the pressure roller 308 are all located on the rotating arm 305. The rotating arm 305 can rotate in the circumferential direction of the slide bar 311. Specifically, the rotating ring 302 is provided with a through hole corresponding to the slide bar 311, and the slide bar 311 can slide along the through hole. The end of the rotating arm 305 can be inserted into the end of the slide bar 311, and the end of the rotating arm 305 is provided with a circular groove; the rotating arm 305 is detachably connected to the slide bar 311 by inserting a bolt through the slide bar 311 into the circular groove and sliding along the circular groove. During the strapping process, the strapping film 309 rotates around the circumference of the three-dimensional stacking packaging box 402 while moving downward, causing the strapping film 309 to tilt, thereby causing the pressure roller 308 to tilt. By rotating the rotating arm 305 set on the slide rod 311, it is ensured that the pressure roller 308 can tilt with the strapping film 309, thereby ensuring the compaction effect.

[0025] Further, such as Figure 7As shown, an annular groove is provided on the sliding plate 301, and a slider 304 is provided on the end of the sliding rod 311 away from the rotating arm 305. The rotation of the rotating ring 302 drives the sliding rod 311 to rotate synchronously, so that the slider 304 slides along the annular groove; the annular groove includes four sections of interconnected arc-shaped gradient grooves 3011, and each section of the arc-shaped gradient groove 3011 corresponds to a side surface of the three-dimensional stacking packaging box 402. The two end positions of the arc-shaped gradient groove 3011 correspond to the right angles of the three-dimensional stacking packaging box 402 respectively, and the distance between the two end positions of the arc-shaped gradient groove 3011 and the axis of the rotating ring 302 is the largest, and the distance between the middle position of the arc-shaped gradient groove 3011 and the axis of the rotating ring 302 is the smallest. In this way, when the pressure roller 308 rotates to the right angle position of the three-dimensional stacking packaging box 402, the slider 304 just enters the end position of the arc-shaped gradient groove 3011, and the slider 304 drives the support arm to slide in the direction away from the axis of the rotating ring 302, reducing the rotation resistance of the pressure roller 308 and making bundling smoother.

[0026] like Figure 4 As shown, the left and right sides of the frame 201 are respectively provided with push plates 205, which are L-shaped and symmetrically arranged. The two push plates 205 can move closer to or farther away from each other in the horizontal direction. The two push plates 205 moving closer to each other can tighten the sides of the three-dimensional stacking packaging boxes 402 in the support tray 400. Figure 2 and Figure 3 The frame 201 is provided with a mounting plate 203, on which a second telescopic cylinder 204 is provided, and a push plate 205 is provided at the end of the second telescopic cylinder 204. Before bundling the three-dimensional stacked packaging boxes 402, by bringing the two push plates 205 closer together, the multiple rows of stacked packaging boxes can be neatly stacked, ensuring the subsequent bundling quality.

[0027] like Figures 10 to 12 As shown, the gluing and cutting roller 307 has a storage chamber 3073 inside, which stores glue. The surface of the gluing and cutting roller 307 has glue outlet holes 3072, which are used to apply glue to the strapping film 309. The glue is water-based and environmentally friendly, so it will not damage the outer surface of the packaging box.

[0028] The glue coating cutting roller 307 is provided with a receiving groove, which extends along the axial direction of the glue coating cutting roller 307. A cutting knife 3071 is provided in the receiving groove. The cutting knife 3071 has a blade, which extends along the length direction of the receiving groove. In the initial state, the lower end of the cutting knife 3071 extends from the receiving groove, and the blade of the cutting knife 3071 is located in the receiving groove. Figure 4As shown, the support tray 400 is equipped with drive blocks 401, the number of which matches the number of gluing and cutting rollers 307. When the gluing and cutting rollers 307 move downward to the lower end of the cutting blade 3071 and contact the drive blocks 401, the cutting blade 3071 can slide upward along the receiving groove and slide radially along the gluing and cutting roller 307, so that its blade extends from the receiving groove. The support tray 400 is provided with a placement frame for placing the three-dimensional stacking packaging boxes 402. The drive blocks 401 are protrusions located outside the placement frame.

[0029] The cutting blade 3071 is provided with at least two parallel inclined grooves 30711, each of which forms a certain angle with the axis of the glue coating and cutting roller 307. A fixed shaft 30712 is provided in the receiving groove, and the fixed shaft 30712 slidably engages with the inclined groove 30711. This allows the cutting blade 3071 to extend from the receiving groove as the cutting blade 3071 moves upward.

[0030] like Figure 9 As shown, a gear ring 312 is provided on the outside of the rotating ring 302, a first drive motor 303 is fixedly provided on the sliding plate 301, and a rotating gear is provided at the output end of the first drive motor 303, which is engaged with the gear ring 312, so that the rotation of the rotating ring 302 can be controlled by the first drive motor 303.

[0031] The sliding plate 301 is provided with four threaded holes 3012, and the frame 201 is provided with four screws 209 extending in the vertical direction. The sliding plate 301 is connected to the four screws 209 by threads, and the screws 209 are provided with a second gear 208. The frame 201 is also provided with a second drive motor 207. The rotation of the second drive motor 207 can drive the four screws 209 to rotate synchronously. Figure 8 and Figure 16 As shown, a driving gear 210 is provided at the output end of the second driving motor 207, and a transmission belt 211 is provided on the driving gear 210 and the four second gears 208. The transmission belt 211 is provided with teeth. The transmission belt 211 is engaged with the driving gear 210 and the four second gears 208 at the same time, thereby controlling the up and down sliding of the sliding plate 301 through the second driving motor 207.

[0032] like Figure 1 As shown, an accessory for a strapping machine, applicable to the aforementioned strapping machine, includes a conveyor belt 100. The conveyor belt 100 is used to transport a support tray 400 to the bottom of a frame 201 and align the exterior of stacked packaging boxes 402 with the interior of a rotating ring 302. The conveyor belt 100 can also transfer the bundled stacked packaging boxes 402.

[0033] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows: During use, the conveyor belt 100 is controlled to transport the empty support pallet 400 to the bottom of the frame 201, and then the second telescopic cylinder 204 is controlled to make the two pushing plates 205 approach each other, and a stacking space is formed between the two L-shaped pushing plates 205 and the support pallet 400. The staff stacks the packaging boxes on the support pallet 400 to form a three-dimensional stacked packaging box 402, and then the second telescopic cylinder 204 is controlled to make the two pushing plates 205 move away from each other, and the first telescopic cylinder 202 is controlled to make the pressing plate 206 press the top of the three-dimensional stacked packaging box 402.

[0034] Then, the second drive motor 207 is controlled to slide the sliding plate 301 downward, while the first drive motor 303 drives the rotating ring 302 to rotate synchronously. In this way, the multiple roller assemblies inside the rotating ring 302 rotate and move downward around the outer circumference of the three-dimensional stacking packaging box 402, the winding roller 306 unwinds the strapping film 309, the gluing and cutting roller 307 applies glue to the strapping film 309, and the pressing roller 308 presses the strapping film 309 against the surface of the three-dimensional stacking packaging box 402 until the sliding plate 301 moves to the lowest position. The rotating ring 302 is then controlled to make the cutting blades 3071 on the multiple gluing and cutting rollers 307 correspond to their respective drive blocks 401. At this time, the cutting blades 3071 can slide upward along the receiving slot and slide along the radial direction of the gluing and cutting roller 307, so that the blades extend from the receiving slot and cut the strapping film 309, thus completing the strapping of the three sides of the three-dimensional stacking packaging box 402.

[0035] Finally, the three-dimensional stacking packaging box 402 is rotated 90° around the axis extending in the left-right direction, and the above-mentioned bundling steps are repeated to complete the bundling of all sides of the three-dimensional stacking packaging box 402.

[0036] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A strapping machine, characterized in that: The present invention relates to a packaging machine which is a stacking machine and a packaging machine which is a stacking machine which is a stacking machine used for packaging the packaging to be stacked in a three-dimensional manner. The present invention relates to a packaging machine which is a stacking machine which is a stacking machine which is a stacking machine used for packaging the packaging to be stacked in a three-dimensional manner. The present invention relates to a packaging machine which is a stacking machine which is a stacking machine which is a stacking machine used for packaging the packaging to be stacked in a three-dimensional manner. The present invention relates to a packaging machine which is a stacking machine which is a stacking machine which is a stacking machine used for packaging the packaging to be stacked in a three-dimensional manner. The present invention relates to a packaging machine which is a stacking machine which is a stacking machine which is a stacking machine used for packaging the packaging to be stacked in a three-dimensional manner. The cutting roller and the pressing roller are arranged in sequence from the inner wall of the rotating ring to the axial direction of the rotating ring; in the initial state, the axes of the winding roller, the gluing and cutting roller and the pressing roller all extend in the up-down direction; the winding roller is wound with a strapping film, and the strapping film is wound around the gluing and cutting roller and then wound on the pressing roller; the gluing and cutting roller is used to glue and cut the strapping film; the pressing roller can press the glued strapping film to the surface of the three-dimensional stacking packaging box; when the sliding plate slides from top to bottom, the rotating ring rotates synchronously around the outside of the three-dimensional stacking packaging box, so that multiple pressing rollers strap the surface of the three-dimensional stacking packaging box from top to bottom, and after strapping is completed, the gluing and cutting roller cuts the strapping film.

2. The strapping machine according to claim 1, characterized in that The support arm includes a detachably connected sliding rod and a rotating arm. The sliding rod can slide radially along the rotating ring. The winding roller, gluing and cutting roller and pressure roller are all located on the rotating arm. The rotating arm can rotate around the circumferential direction of the sliding rod.

3. The strapping machine according to claim 2, characterized in that The sliding plate is provided with an annular groove, and the end of the sliding rod away from the rotating arm is provided with a slider. The rotation of the rotating ring drives the sliding rod to rotate synchronously, so that the slider slides along the annular groove; the annular groove includes four sections of arc-shaped gradient grooves connected to each other, each section of the arc-shaped gradient groove corresponds to a side surface of the three-dimensional stacking packaging box, and the two end positions of the arc-shaped gradient groove correspond to the right angles of the three-dimensional stacking packaging box respectively, and the distance between the two end positions of the arc-shaped gradient groove and the axis of the rotating ring is the largest, and the distance between the middle position of the arc-shaped gradient groove and the axis of the rotating ring is the smallest.

4. The strapping machine according to claim 1, characterized in that The left and right sides of the frame are respectively provided with a pushing plate, which is L-shaped and symmetrically arranged on the left and right. The two pushing plates can approach or move away from each other in the horizontal direction. The approach of the two pushing plates can tighten the sides of the three-dimensional stacking packaging boxes in the supporting tray.

5. The strapping machine according to claim 1, characterized in that A storage cavity is provided inside the glue coating and cutting roller, and glue is stored in the storage cavity; a glue outlet hole is provided on the surface of the glue coating and cutting roller, and the glue outlet hole is used to apply glue to the strapping film.

6. The strapping machine according to claim 1, characterized in that The glue coating and cutting roller is provided with a receiving groove, which extends along the axial direction of the glue coating and cutting roller. A cutting knife is provided in the receiving groove, and the cutting knife has a blade, which extends along the length direction of the receiving groove. In the initial state, the lower end of the cutting knife extends from the receiving groove, and the blade of the cutting knife is located in the receiving groove. The support tray is provided with driving blocks, and the number of the driving blocks is consistent with the number of the glue coating and cutting rollers. When the glue coating and cutting roller moves down to the lower end of the cutting knife and contacts the driving block, the cutting knife can slide upward along the receiving groove and slide along the radial direction of the glue coating and cutting roller, so that its blade extends from the receiving groove.

7. The strapping machine according to claim 6, characterized in that: The cutting knife is provided with at least two parallel inclined grooves, the inclined grooves have a certain angle with the axis of the glue coating and cutting roller, and the accommodating groove is provided with a fixed shaft, which is in sliding cooperation with the inclined grooves.

8. The strapping machine according to claim 1, characterized in that A gear ring is provided on the outside of the rotating ring, a first driving motor is fixedly provided on the sliding plate, and a rotating gear is provided at the output end of the first driving motor, and the rotating gear is meshed with the gear ring.

9. The strapping machine according to claim 1, characterized in that: The sliding plate is provided with four threaded holes, and the frame is provided with four screw rods extending in the up and down directions. The sliding plate is connected to the four screw rods through threads. The frame is also provided with a second drive motor, and the rotation of the second drive motor can drive the four screw rods to rotate synchronously.

10. An accessory for a strapping machine, applied to the strapping machine according to any one of claims 1 to 9, characterized in that: The conveyor belt is used to transport the supporting tray to the bottom of the frame and make the outside of the three-dimensional stacking packaging box correspond to the inside of the rotating ring.

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