PET (Polyethylene Terephthalate) belt bundling machine core with compact structure

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) belt bundling machine core with a compact structure, which belongs to the technical field of packaging machinery and comprises a rack assembly, a tightening mechanism, a material belt feeding track, a high pull wheel assembly, a belt feeding wheel assembly, a cam driving device, a cam transmission assembly, an in-place detection mechanism and a friction servo motor, the lacing mechanism is rotationally connected with the rack assembly, the material belt feeding rail penetrates through the lacing mechanism and is located at the top of the high pull wheel assembly, the belt conveying wheel assembly is located below the high pull wheel assembly, the cam driving device is located on the right side of the rack assembly and connected with the rack assembly, and the cam transmission assembly is located in the rack assembly. The cam transmission assembly is connected with the cam driving device, and the in-place detection mechanism is connected with the rack assembly. The automatic binding machine is compact in structure, a plurality of key actions such as pressing, tightening, cutting and welding are accurately coordinated by taking a cam system as a guide, and the automation degree, the stability and the binding quality of binding operation are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of boom cranes, specifically relating to a compact PET strapping mechanism. Background Technology

[0002] In the current cargo packaging industry, strapping machines are widely used to secure goods. The traditional method involves using steel straps with metal buckles. While these buckle-type steel strapping heads are widely used, their drawbacks are becoming increasingly apparent. First, steel straps and metal buckles are consumables, resulting in relatively high material costs. Second, whether using steel nail stamping or complex buckle-making mechanisms to connect the steel straps, the buckling process is time-consuming and slow, making it difficult to meet the demands of high-paced production. Furthermore, the complex locking mechanism not only increases the manufacturing cost of the equipment itself but also makes subsequent maintenance and repair difficult. To overcome these shortcomings of steel strapping, the industry is gradually shifting towards using PET strapping as an alternative.

[0003] However, existing packaging heads often rely on multiple independent drive sources (such as motors and cylinders) and complex control systems to achieve a series of complex actions such as feeding, tightening, pressing, welding, and cutting. This results in problems such as insufficient structural compactness, long transmission chains, numerous failure points, and low precision in the timing of actions. In particular, there are still significant technological gaps in existing technologies regarding how to achieve centralized and sequential control of multiple core actions by a single power source through ingenious mechanical design, and how to accurately control the speed and torque of the feeding and pull-back tightening processes. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a compact PET strapping core, effectively solving the problems of existing strapping heads that often rely on multiple independent drive sources and complex control systems to achieve a series of complex actions such as strapping, tightening, pressing, welding, and cutting. These problems result in insufficient compactness, long transmission chains, numerous failure points, and low precision in the timing of actions. In particular, there are still significant technological gaps in existing technologies regarding how to achieve centralized and sequential control of multiple core actions by a single power source through ingenious mechanical design, and how to accurately control the speed and torque of the strapping and pull-back tightening processes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a compact PET strapping mechanism, comprising a frame assembly, a tightening mechanism, a material feed track, a high-tension roller assembly, a feed roller assembly, a cam drive device, a cam transmission assembly, a detection and positioning mechanism, and a friction servo motor; the tightening mechanism is rotatably connected to the frame assembly, the material feed track passes through the tightening mechanism and is located at the top of the high-tension roller assembly, the feed roller assembly is located below the high-tension roller assembly, the cam drive device is located on the right side of the frame assembly and connected to it, the cam transmission assembly is located inside the frame assembly and is connected to the cam drive device, and the detection and positioning mechanism is connected to the frame assembly.

[0006] Preferably, the frame assembly includes a housing, a connecting shaft, a high-tension support plate, a hatch assembly, a large fin assembly, a small fin assembly, and a top side displacement buffer structure. The connecting shaft is connected to the housing, the high-tension support plate is connected to the housing, the connecting shaft passes through the high-tension support plate, the hatch assembly is located at the front of the housing and connected to it, and the top side displacement buffer structure is located at the top of the housing and connected to it.

[0007] Preferably, the tightening mechanism includes a tightening connecting plate, a tightening pressure plate, a tightening wheel, and a tightening gear. The tightening connecting plate has an L-shaped structure, and the connecting shaft passes through the tightening connecting plate.

[0008] Preferably, the top of the tightening connecting plate is provided with a material belt track opening groove, through which the material belt inlet track passes through the tightening connecting plate. The material belt inlet track is fixedly connected to the box body, and the material belt inlet track has an arc-shaped structure.

[0009] Preferably, the high-tension wheel assembly includes a high-tension servo motor, a high-tension reducer, a high-tension wheel, and a high-tension gear; one end of the high-tension reducer is connected to the high-tension servo motor, and the other end is fixedly connected to the housing; the extension shaft of the high-tension reducer passes through the high-tension wheel, the high-tension gear, and the high-tension support plate in sequence and is connected to the high-tension support plate through a bearing; the module of the high-tension gear corresponds to the module of the clamping gear.

[0010] Preferably, the belt feeding wheel assembly includes a belt feeding wheel, a belt feeding servo motor, and a tensioning mechanism. The belt feeding servo motor is fixedly connected to the housing. The extension shaft of the belt feeding servo motor passes through the belt feeding wheel and is connected to the frame assembly through a bearing. The tensioning mechanism is located on the left side of the belt feeding wheel and adjusts the pressure borne by the PET belt.

[0011] Preferably, the cam drive device includes a cam servo motor, a cam reducer, a drive pulley, a driven pulley, and a first belt. One end of the cam reducer is connected to the cam servo motor, and the other end is fixedly connected to the housing. The extension shaft of the cam reducer passes through the drive pulley and is fixedly connected to it by a key. The drive pulley drives the driven pulley to rotate through the first belt.

[0012] Preferably, the cam transmission assembly includes a drive shaft, a first cam, a second cam, a third cam, a fourth cam, a fifth cam, a left pressure cutter, a middle pressure cutter, a right pressure cutter, and a tool cavity. The right end of the drive shaft passes through the driven pulley and is fixedly connected to it by a key. The drive shaft passes through and connects the first cam, the second cam, the third cam, the fourth cam, and the fifth cam sequentially from left to right. The left pressure cutter is disposed below the second cam, the middle pressure cutter is disposed below the third cam, and the right pressure cutter is disposed below the fourth cam. The tool cavity is fixedly connected to the housing. The left pressure cutter, the middle pressure cutter, and the right pressure cutter are all engaged in the tool cavity and can move vertically.

[0013] Preferably, the medium-pressure knife includes a cutting blade and a friction head, wherein the cutting blade is located on the left side of the friction head, the lowest point of the cutting blade is higher than the lowest point of the friction head, the friction servo motor is fixedly connected to the housing, and the friction servo motor is connected to the friction head through a second belt, a friction pulley and an eccentric structure, and the continuous rotation of the friction servo motor drives the reciprocating motion of the friction head in the front-back direction.

[0014] Preferably, the detection positioning mechanism includes a detection block and a positioning photoelectric sensor, wherein the positioning photoelectric sensor is located on top of the detection block.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention provides a compact PET strapping core, which realizes a set of cam system as the main body to accurately coordinate multiple key actions such as pressing, tightening, cutting and welding, which significantly improves the automation, stability and strapping quality of the strapping operation.

[0017] (2) Through the coordinated operation of the cam drive device and the cam transmission assembly, the present invention achieves time-sharing and sequential driving of multiple execution components such as the left pressure knife, right pressure knife, middle pressure knife, and tightening mechanism with a set of coaxial cams and a single cam servo motor, which greatly simplifies the transmission chain and makes the whole machine structure more compact and reliable. Furthermore, through the optimized layout of functional components, the material belt path is simplified, unnecessary guide structures are reduced, and the belt threading resistance is lowered.

[0018] (3) Through the design of the intermediate pressure knife, cam transmission assembly and friction servo motor, the present invention successfully integrates the cutting knife for cutting and the friction head for welding on the intermediate pressure knife, and achieves seamless connection of pressing-cutting-welding action by precisely controlling its descent process through the cam; and the friction head is driven by an independent friction servo motor, so that its reciprocating motion is independent of the speed of the main drive shaft, and the two do not affect each other, thus ensuring welding quality and efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a utility model Figure 1 Another perspective illustration;

[0021] Figure 3 This is a schematic diagram of the box structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the tightening mechanism of this utility model;

[0023] Figure 5 This is a schematic diagram showing the connection between the tightening mechanism and the high pull wheel assembly of this utility model;

[0024] Figure 6 This is a utility model Figure 5 A schematic diagram of the structure after removing the high-tension gear;

[0025] Figure 7 This is a schematic diagram of the detection positioning mechanism and the hatch assembly of this utility model;

[0026] Figure 8 This is a schematic diagram of the cam transmission assembly structure of this utility model;

[0027] Figure 9 This is a utility model Figure 8 A magnified view of a portion of the image;

[0028] Figure 10 This is a schematic diagram of the overlapping sections formed by the PET tape of this utility model.

[0029] In the diagram: 100, frame assembly; 110, housing; 120, connecting shaft; 130, high-tension support plate; 140, door assembly; 150, large fin assembly; 160, small fin assembly; 170, top side displacement buffer structure; 200, tensioning mechanism; 210, tightening connecting plate; 220, tensioning wheel; 230, tensioning gear; 300, material belt feed track; 400, high-tension wheel assembly; 410, high-tension servo motor; 420, high-tension reducer; 430, high-tension wheel; 440, high-tension gear; 500, belt feeder assembly; 510, belt feeder; 520, belt feed servo motor; 530, tensioning mechanism; 600, Cam drive device; 610, Cam servo motor; 620, Cam reducer; 630, Drive pulley; 640, Driven pulley; 650, First belt; 700, Cam transmission assembly; 710, Transmission shaft; 720, First cam; 730, Second cam; 740, Third cam; 750, Fourth cam; 750a, Fifth cam; 760, Left pressure knife; 770, Middle pressure knife; 771, Cutting knife; 772, Friction head; 780, Right pressure knife; 790, Tool cavity; 800, Detection and positioning mechanism; 810, Detection block; 820, Position photoelectric sensor; 900, Friction servo motor. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", and "outer" indicate orientation or positional relationships only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] It should be understood that, in the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly.

[0033] Example 1: See Appendix Figures 1 to 10This embodiment 1 provides a compact PET strapping mechanism, including a frame assembly 100, a tightening mechanism 200, a strapping feed track 300, a high-tension roller assembly 400, a feed roller assembly 500, a cam drive device 600, a cam transmission assembly 700, a detection and positioning mechanism 800, and a friction servo motor 900. The strapping feed track 300 is fixedly connected to the frame assembly 100, and the tightening mechanism 200 is rotatably connected to the frame assembly 100. The strapping feed track 300 passes through the strapping mechanism. The tensioning mechanism 200 is located on top of the high tension roller assembly 400. Both the high tension roller assembly 400 and the feed roller assembly 500 are connected to the frame assembly 100. The feed roller assembly 500 is located below the high tension roller assembly 400. The cam drive device 600 is located on the right side of the frame assembly 100 and connected to it. The cam transmission assembly 700 is located inside the frame assembly 100 and is connected to the cam drive device 600. The detection positioning mechanism 800 is connected to the frame assembly 100.

[0034] The frame assembly 100 includes a housing 110, a connecting shaft 120, a high-tension support plate 130, a hatch assembly 140, a large fin assembly 150, a small fin assembly 160, and a top side displacement buffer structure 170. The housing 110 is the supporting skeleton of the frame assembly 100. The connecting shaft 120 is connected to the housing 110, and the high-tension support plate 130 is connected to the housing 110. The connecting shaft 120 passes through the high-tension support plate 130. The hatch assembly 140 is located at the front of the housing 110 and is connected to it. The large fin assembly 150 and the small fin assembly 160 are both connected to the hatch assembly 140. The top side displacement buffer structure 170 is located at the top of the housing 110 and is connected to it.

[0035] The tightening mechanism 200 includes a tightening connecting plate 210, a tightening pressure plate, a tightening wheel 220, and a tightening gear 230. The tightening connecting plate 210 has an L-shaped structure, and the connecting shaft 120 passes through the tightening connecting plate 210. The top of the tightening connecting plate 210 has a material belt track opening groove, through which the material belt feed track 300 passes through the tightening connecting plate 210. There are two tightening pressure plates, two tightening wheels, and two tightening gears 230. The tightening wheels 220 and the tightening gears 230 are coaxially arranged. The material belt feed track 300 is fixedly connected to the box 110 and has an arc-shaped structure.

[0036] The high-tension wheel assembly 400 includes a high-tension servo motor 410, a high-tension reducer 420, a high-tension wheel 430, and a high-tension gear 440. One end of the high-tension reducer 420 is connected to the high-tension servo motor 410, and the other end is fixedly connected to the housing 110. The extension shaft of the high-tension reducer 420 passes through the high-tension wheel 430, the high-tension gear 440, and the high-tension support plate 130 in sequence and is connected to the high-tension support plate 130 through a bearing. The module of the high-tension gear 440 corresponds to the module of the clamping gear 230.

[0037] The belt feeder assembly 500 includes a belt feeder 510, a belt feeder servo motor 520, and a tensioning mechanism 530. The belt feeder servo motor 520 is fixedly connected to the housing 110. The extension shaft of the belt feeder servo motor 520 passes through the belt feeder 510 and is connected to the frame assembly 100 through a bearing. The tensioning mechanism 530 is located on the left side of the belt feeder 510 and adjusts the pressure borne by the PET belt.

[0038] The cam drive device 600 includes a cam servo motor 610, a cam reducer 620, a drive pulley 630, a driven pulley 640, and a first belt 650. One end of the cam reducer 620 is connected to the cam servo motor 610, and the other end is fixedly connected to the housing 110. The extension shaft of the cam reducer 620 passes through the drive pulley 630 and is fixedly connected to it by a key. The drive pulley 630 drives the driven pulley 640 to rotate through the first belt 650.

[0039] The cam drive assembly 700 includes a drive shaft 710, a first cam 720, a second cam 730, a third cam 740, a fourth cam 750, and a fifth cam 750a, a left pressure cutter 760, a middle pressure cutter 770, a right pressure cutter 780, and a tool cavity 790. The right end of the drive shaft 710 passes through a driven pulley 640 and is fixedly connected to it by a key. The drive shaft 710 sequentially connects the first cam 720, the second cam 730, the third cam 740, the fourth cam 750, and the fifth cam 750a from left to right. The left pressure cutter 760 is located below the second cam 730, and the middle pressure cutter 770 is located below the third cam 740. The middle pressure cutter 770 includes a cutting blade 7. 71 and friction head 772, wherein the cutting blade 771 is located on the left side of the friction head 772, and the height of the lowest point of the cutting blade 771 is higher than the height of the lowest point of the friction head 772. A right pressure blade 780 is provided below the fourth cam 750. The tool cavity 790 is fixedly connected to the housing 110. The left pressure blade 760, the middle pressure blade 770, and the right pressure blade 780 are all engaged in the tool cavity 790 and can move up and down. The friction servo motor 900 is fixedly connected to the housing 110. The friction servo motor 900 is connected to the friction head 772 through the second belt, the friction pulley, and the eccentric structure. The continuous rotation of the friction servo motor 900 drives the friction head 772 to reciprocate in the front and back directions.

[0040] The detection positioning mechanism 800 includes a detection block 810 and a positioning photoelectric sensor 820, with the positioning photoelectric sensor 820 located on top of the detection block 810.

[0041] It is easy to understand that in this utility model, the high-pulling servo motor 410, the tape feeding servo motor 520, the cam servo motor 610 and the friction servo motor 900 are all connected to the PLC control system. Since the PLC control system is a mature technology, it will not be described in detail here. The positioning photoelectric sensor 820 is also connected to the PLC control system.

[0042] It should be noted that, in actual use, the strapping mechanism of this utility model needs to be raised and lowered in the height direction through a lifting mechanism (not shown in the figure). At the same time, the strapping mechanism of this utility model is provided with belt channels on both sides (not shown in the figure). The inlet of the large fin assembly 150 and the outlet of the small fin assembly 160 are both flush with the belt channels. The goods to be packed are placed directly below the strapping mechanism of this utility model (not shown in the figure).

[0043] When the PET belt is pulled back to retract the packaged goods, since one end of the PET belt is fixed, it is necessary to monitor the magnitude of the reverse torque value of the high-tension servo motor 410 to determine whether the PET belt is tightened. Usually, the driver of the high-tension servo motor 410 is used to feed the torque signal back to the PLC control system.

[0044] When the PET belt is conveyed in the forward direction, the PET belt passes around the goods to be packaged through the small fin assembly 160 and then enters the large fin assembly 150 to continue forward. When the head of the PET belt touches the detection block 810, the detection block 810 rotates slightly towards the positioning photoelectric sensor 820, which is detected by the positioning photoelectric sensor 820 and feeds the signal back to the PLC control system. At this time, the PET belt forms an overlapping section on the top of the goods to be packaged.

[0045] When the PET belt is conveyed in the forward direction, the linear velocity V1 of the PET belt at the feed roller assembly 500 and its linear velocity V2 at the high tension roller assembly 400 have the following relationship: V1 > V2; when the PET belt is reversed and tightly bound to the goods to be packaged, the linear velocity V3 of the PET belt at the feed roller assembly 500 and its linear velocity V4 at the high tension roller assembly 400 have the following relationship: V3 < V4; and V1 > V4, V2 > V3.

[0046] It is easy to understand that when multiple cams are connected to the same drive shaft 710, their motion patterns will also be different because the profile shape and phase of each cam may be different. When the drive shaft 710 rotates continuously, the followers of different cams will be lifted or kept stationary at different times. This difference is determined by the profile shape and phase of the cams, which means that at a certain stage, the followers of some cams will change position, while others may be stationary or have a slight position change. This characteristic allows multiple cams to achieve complex motion control on the same drive shaft 710 to meet different mechanical transmission needs. Since the profile design of the cams is an existing mature technology, it will not be described in detail here.

[0047] It should be noted that, as shown in the attached document... Figure 10 As shown in the diagram, Figure a represents the PET belt fed into the small fin assembly 160 via the feed roller 510, and Figure b represents the PET belt entering the detection block 810 from the large fin assembly 150. Figure a is above Figure b, and the two form an overlapping section. This overlapping section is located below the intermediate pressure knife 770. See Appendix again. Figure 10 It can be seen that when the left pressure knife 760 is fully pressed down, the left pressure knife 760 does not contact the overlapping section. Similarly, when the right pressure knife 780 is fully pressed down, the right pressure knife 780 does not contact the overlapping section. Since the height of the lowest point of the cutting knife 771 is higher than the height of the lowest point of the friction head 772, the cutting knife 771 will only cut the PET strip at the top of the overlapping section. Usually, a corresponding grooved pattern plate is set below the friction head 772. The friction servo motor 900 drives the friction head 772 to move back and forth in the front and back direction to fuse the PET strips of the upper and lower layers of the overlapping section. This is an existing mature technology and will not be described in detail here.

[0048] The compact PET strapping mechanism described in Embodiment 1 is used as follows: Before threading the strap, the strapping mechanism is lowered to a set position so that the inlet of the large fin assembly 150 and the outlet of the small fin assembly 160 are level with the belt conveyor. Then, the high-tension servo motor 410 and the belt feeding servo motor 520 are started in the forward direction. The PET strap in the feed track 300 first passes through the high-tension roller 430 and then the belt feeding roller 510. After the small fin assembly 160 circles the goods to be packaged once on the belt conveyor, it enters the large fin assembly 150. The feeding continues. When the head of the PET belt touches the detection block 810, the detection block 810 rotates slightly towards the positioning photoelectric sensor 820. This rotation is detected by the positioning photoelectric sensor 820, which then feeds a signal back to the PLC control system, stopping the operation of the high-pulling servo motor 410 and the feeding servo motor 520. Subsequently, the cam servo motor 610 is started, driving the drive shaft 710 to rotate. When the second cam 730 brings the left pressure knife 760 to its lowest position, the left pressure knife 760 presses the PET belt.

[0049] Next, the high-tension servo motor 410 and the tape feeding servo motor 520 are started in reverse to enter the PET tape pull-back stage. At this time, the drive shaft 710 continues to rotate, and the first cam 720 pushes the tightening connecting plate 210 upward, causing the tightening connecting plate 210 to rotate around the connecting shaft 120. At this time, the high-tension gear 440 rotates clockwise, driving the tensioning gear 230 to rotate counterclockwise, so that the PET tape between the tensioning wheel 220 and the high-tension wheel 430 is tightened. When the reverse torque of the high-tension servo motor 410 reaches the set value, the operation of the high-tension servo motor 410 and the tape feeding servo motor 520 is stopped; the drive shaft 710 continues to rotate, and when the fourth cam 750... When the right pressure knife 780 is pressed down to its lowest position, it clamps the PET strip. At this time, the left pressure knife 760 maintains the clamping state. At this time, the first cam 720 disengages from the tightening connecting plate 210, the tightening mechanism 200 resets, the drive shaft 710 continues to rotate, and the third cam 740 presses down the middle pressure knife 770. During this process, the cutting knife 771 cuts the upper layer of PET strip in the overlapping section. Then, the middle pressure knife 770 continues to press down, the friction head 772 contacts the PET strip, and the friction servo motor 900 is started, driving the friction head 772 to move back and forth in the front and back direction, so that the upper and lower layers of PET strip in the overlapping section are fused together. After a preset time, the operation of the friction servo motor 900 is stopped.

[0050] The drive shaft 710 continues to rotate, and the fifth cam 750a lifts the hatch assembly 140, opening the hatch assembly 140 and causing the strapping mechanism of this utility model to move upward. The PET strap disengages from the large fin assembly 150 and the small fin assembly 160, causing the second cam 730, the third cam 740, the fourth cam 750, and the fifth cam 750a to reset. At this time, the left pressure knife 760, the middle pressure knife 770, and the right pressure knife 780 are all reset, and the strapping action is completed.

[0051] It should be noted that when the strapping mechanism of this utility model descends to the set position, it is necessary to determine whether the PET tape connected to the unwinding mechanism is being fed for the first time or not. If it is being fed for the first time, it is only necessary to manually feed the PET tape to be fed to below the feed roller 510 for the first time.

[0052] It should be noted that the purpose of lifting and opening the hatch assembly 140 is to separate the PET strap from the strapping mechanism of this utility model. When the PET strap separates from the large fin assembly 150, under the action of external force, the large fin assembly 150 is rotated outward at a certain angle by the spring of the large fin assembly 150, so that the PET strap separates from the large fin assembly 150. The separation of the PET strap from the small fin assembly 160 adopts the same method. The separation of the PET strap from the large fin assembly 150 and the small fin assembly 160 are both existing mature technologies and will not be described in detail here.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A compact PET strapping mechanism, characterized in that, The system includes a frame assembly (100), a tensioning mechanism (200), a feed rail (300), a high-tension roller assembly (400), a feed roller assembly (500), a cam drive device (600), a cam transmission assembly (700), a detection and positioning mechanism (800), and a friction servo motor (900). The tensioning mechanism (200) is rotatably connected to the frame assembly (100), and the feed rail (300) passes through the tensioning mechanism (200) and is located at the high-tension roller. The top of the assembly (400) has the belt feeder assembly (500) located below the high pulley assembly (400), the cam drive device (600) located on the right side of the frame assembly (100) and connected thereto, the cam transmission assembly (700) located inside the frame assembly (100) and connected to the cam drive device (600), and the detection positioning mechanism (800) connected to the frame assembly (100).

2. The compact PET strapping mechanism according to claim 1, characterized in that, The frame assembly (100) includes a housing (110), a connecting shaft (120), a high-tension support plate (130), a door assembly (140), a large fin assembly (150), a small fin assembly (160), and a top side displacement buffer structure (170). The connecting shaft (120) is connected to the housing (110), the high-tension support plate (130) is connected to the housing (110), the connecting shaft (120) passes through the high-tension support plate (130), the door assembly (140) is located at the front of the housing (110) and connected to it, and the top side displacement buffer structure (170) is located at the top of the housing (110) and connected to it.

3. The compact PET strapping mechanism according to claim 2, characterized in that, The tightening mechanism (200) includes a tightening connecting plate (210), a tightening pressure plate, a tightening wheel (220), and a tightening gear (230). The tightening connecting plate (210) has an L-shaped structure, and the connecting shaft (120) passes through the tightening connecting plate (210).

4. The compact PET strapping mechanism according to claim 3, characterized in that, The top of the tightening connecting plate (210) is provided with a material belt track opening groove, through which the material belt inlet track (300) passes through the tightening connecting plate (210). The material belt inlet track (300) is fixedly connected to the box body (110), and the material belt inlet track (300) has an arc-shaped structure.

5. The compact PET strapping mechanism according to claim 3, characterized in that, The high-tension wheel assembly (400) includes a high-tension servo motor (410), a high-tension reducer (420), a high-tension wheel (430), and a high-tension gear (440). One end of the high-tension reducer (420) is connected to the high-tension servo motor (410), and the other end is fixedly connected to the housing (110). The extension shaft of the high-tension reducer (420) passes through the high-tension wheel (430), the high-tension gear (440), and the high-tension support plate (130) in sequence and is connected to the high-tension support plate (130) through a bearing. The module of the high-tension gear (440) corresponds to the module of the clamping gear (230).

6. The compact PET strapping mechanism according to claim 5, characterized in that, The belt feeder assembly (500) includes a belt feeder (510), a belt feeder servo motor (520), and a tensioning mechanism (530). The belt feeder servo motor (520) is fixedly connected to the housing (110). The extension shaft of the belt feeder servo motor (520) passes through the belt feeder (510) and is connected to the frame assembly (100) through a bearing. The tensioning mechanism (530) is located on the left side of the belt feeder (510) and adjusts the pressure borne by the PET belt.

7. The compact PET strapping mechanism according to claim 6, characterized in that, The cam drive device (600) includes a cam servo motor (610), a cam reducer (620), a drive pulley (630), a driven pulley (640), and a first belt (650). One end of the cam reducer (620) is connected to the cam servo motor (610), and the other end is fixedly connected to the housing (110). The extension shaft of the cam reducer (620) passes through the drive pulley (630) and is fixedly connected to it by a key. The drive pulley (630) drives the driven pulley (640) to rotate through the first belt (650).

8. The compact PET strapping mechanism according to claim 7, characterized in that, The cam drive assembly (700) includes a drive shaft (710), a first cam (720), a second cam (730), a third cam (740), a fourth cam (750), a fifth cam (750a), a left pressure cutter (760), a middle pressure cutter (770), a right pressure cutter (780), and a cutter cavity (790). The right end of the drive shaft (710) passes through the driven pulley (640) and is fixedly connected to it by a key. The drive shaft (710) is sequentially connected from left to right to the first cam (720), the second cam (730), the third cam (740), the fourth cam (750), the fifth cam (750a), a left pressure cutter (760), a middle pressure cutter (770), a right pressure cutter (780), and a cutter cavity (790). The system includes a cam (740), a fourth cam (750), and a fifth cam (750a). The left pressure knife (760) is located below the second cam (730), the middle pressure knife (770) is located below the third cam (740), and the right pressure knife (780) is located below the fourth cam (750). The tool cavity (790) is fixedly connected to the housing (110). The left pressure knife (760), the middle pressure knife (770), and the right pressure knife (780) are all engaged in the tool cavity (790) and can move up and down.

9. The compact PET strapping mechanism according to claim 8, characterized in that, The medium-pressure knife (770) includes a cutting blade (771) and a friction head (772), wherein the cutting blade (771) is located to the left of the friction head (772), and the height of the lowest point of the cutting blade (771) is higher than the height of the lowest point of the friction head (772). The friction servo motor (900) is fixedly connected to the housing (110), and the friction servo motor (900) is connected to the friction head (772) through a second belt, a friction pulley and an eccentric structure. The continuous rotation of the friction servo motor (900) drives the friction head (772) to reciprocate in the front-back direction.

10. The compact PET strapping mechanism according to claim 9, characterized in that, The detection positioning mechanism (800) includes a detection block (810) and a positioning photoelectric sensor (820), with the positioning photoelectric sensor (820) located on top of the detection block (810).

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