PET belt strapping machine and strapping method

Abstract

The invention provides a PET belt strapping machine and a strapping method, and belongs to the technical field of packaging machinery, the strapping machine comprises goods to be packaged, a belt track and a machine core, the machine core comprises a rack assembly, a tightening mechanism, a material belt feeding track, a high pull wheel assembly, a belt conveying wheel assembly, a cam driving device, a cam transmission assembly, an in-place detection mechanism, a friction servo motor and a PLC control system; 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 cam system is used as a main guide, multiple key actions such as pressing, tightening, cutting and welding are precisely coordinated, and the automation degree, stability and bundling quality of bundling operation are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging machinery, and particularly relates to a PET belt strapping machine and a strapping method. Background Art

[0002] In the current field of goods packaging, strapping machines are widely used to strap and fix goods. The traditional method is to use steel belts in combination with metal buckles for strapping. Although such buckle-type steel belt strapping heads are widely used, their disadvantages are becoming increasingly prominent. Firstly, as consumables, the material costs of steel belts and metal buckles are relatively high; secondly, whether it is using steel nails for stamping or complex buckle-making mechanisms to complete the connection of steel belts, the buckle-making process is time-consuming and slow, and it is difficult to meet the high-paced production requirements; furthermore, the complex lock buckle mechanical structure not only increases the manufacturing cost of the equipment itself, but also makes subsequent maintenance and repair work difficult. In order to overcome the above deficiencies of steel belt strapping, the industry has gradually turned to using PET belts as an alternative solution.

[0003] Patent document CN113443235A discloses a packing device with an automatic corner protector feeding function and its control method. The packing device includes a frame, a packing head and a packing chute arranged on the frame. The packing head and the packing chute form a packing area, and further includes an automatic corner protector feeding mechanism; the automatic corner protector feeding mechanism includes: a feeding module, the feeding module includes a storage rack and a discharging component. The storage rack is arranged vertically and forms a storage groove for corner protectors. The top of the storage groove forms an outlet. A slidable carrier is arranged in the storage groove. The discharging component is located above the storage groove and is slidably arranged on the storage rack. The discharging component is used to push the corner protectors in the storage groove out of the outlet; a clamping module, the clamping module includes a mounting frame, a telescopic mechanism and clamping jaws. The telescopic mechanism is arranged on the mounting frame, and the clamping jaws are arranged on the telescopic mechanism. It realizes reducing the volume of the overall equipment and reducing the packing cost.

[0004] The focus of the above patent improvement lies in realizing the automatic feeding of corner protectors, which belongs to the peripheral auxiliary function in the packing process. However, for the packing head (i.e., the strapping core) itself, which determines the core quality and efficiency of the strapping operation, this document does not give specific and optimized solutions for its internal mechanical structure, transmission method and coordinated control principle. In order to realize a series of complex actions such as belt feeding, tightening, pressing, welding, and cutting, the packing heads in the prior art often rely on multiple independent drive sources (such as motors, cylinders) and complex control systems, and have problems such as insufficiently compact structure, long transmission chain, many fault points, and low accuracy in the timing coordination of actions; especially in terms of how to achieve centralized and sequential control of multiple core actions by a single power source through delicate mechanical design, and how to precisely control the speed and torque during the belt feeding and pulling-back tightening processes, there are still obvious technical gaps in the prior art. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a PET belt strapping machine and a strapping method, which effectively solve the problems that in the prior art, in order to realize a series of complex actions such as belt feeding, tightening, pressing, welding, cutting, etc., the packing head often relies on multiple independent drive sources and complex control systems, resulting in problems such as insufficiently compact structure, long transmission chain, many fault points, and low accuracy of action timing coordination; especially in terms of how to achieve centralized and sequential control of multiple core actions by a single power source through delicate mechanical design, and how to accurately control the speed and torque during the belt feeding and pulling-back tightening processes, there are still obvious technical gaps in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: A PET belt strapping machine includes goods to be packed, a belt path, and a machine core. The machine core includes a frame assembly, a tightening mechanism, a tape inlet track, a high-tension pulley assembly, a belt feeding wheel assembly, a cam driving device, a cam transmission assembly, a detection-in-place mechanism, a friction servo motor, and a PLC control system; the tightening mechanism is rotationally connected to the frame assembly, the tape inlet track penetrates through the tightening mechanism and is located at the top of the high-tension pulley assembly, the belt feeding wheel assembly is located below the high-tension pulley assembly, the cam driving device is located on the right side of the frame assembly and is connected thereto, the cam transmission assembly is located inside the frame assembly, the cam transmission assembly is connected to the cam driving device, and the detection-in-place mechanism is connected to the frame assembly.

[0007] Preferably, the frame assembly includes a box body, a connecting shaft, a high-tension support plate, a hatch assembly, a large fin assembly, a small fin assembly, a top side displacement buffer structure, and a plurality of peripheral cover plates. The connecting shaft is connected to the box body, the high-tension support plate is connected to the box body, the connecting shaft penetrates through the high-tension support plate, the hatch assembly is located at the front of the box body and is connected thereto, and the top side displacement buffer structure is located at the top of the box body and is connected thereto.

[0008] Preferably, the tightening mechanism includes a tightening connecting plate, a tightening pressure plate, a tightening wheel, and a tightening gear. The tightening connecting plate is an L-shaped structure, the connecting shaft penetrates through the tightening connecting plate, an opening groove for the tape track is formed at the top of the tightening connecting plate, and through the opening groove for the tape track, the tape inlet track penetrates through the tightening connecting plate. The tape inlet track is fixedly connected to the box body, and the tape inlet track is an arc-shaped structure.

[0009] Preferably, the high-pull wheel assembly includes a high-pull servo motor, a high-pull speed reducer, a high-pull wheel, and a high-pull gear; one end of the high-pull speed reducer is connected to the high-pull servo motor, and the other end is fixedly connected to the box body. The extending shaft of the high-pull speed reducer sequentially penetrates through the high-pull wheel, the high-pull gear, and the high-pull support plate and is connected to the high-pull support plate through a bearing. The module of the high-pull gear corresponds to the module of the tightening 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 box body. The extending shaft of the belt-feeding servo motor penetrates 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 the pressure borne by the PET belt is adjusted through the tensioning mechanism.

[0011] Preferably, when the PET belt is fed forward, the linear velocity V1 of the PET belt at the belt-feeding wheel assembly and its linear velocity V2 at the high-pull wheel assembly have the following relationship: V1 > V2; when the PET belt is used to tightly bind the goods to be packaged in the reverse direction, the linear velocity V3 of the PET belt at the belt-feeding wheel assembly and its linear velocity V4 at the high-pull wheel assembly have the following relationship: V3 < V4; and V1 > V4, V2 > V3.

[0012] Preferably, the cam driving device includes a cam servo motor, a cam speed reducer, a driving pulley, a driven pulley, and a first belt. One end of the cam speed reducer is connected to the cam servo motor, and the other end is fixedly connected to the box body. The extending shaft of the cam speed reducer penetrates through the driving pulley and is fixedly connected to it through a key. The driving pulley drives the driven pulley to rotate through the first belt.

[0013] Preferably, the cam transmission assembly includes a transmission shaft and a tool cavity. The right end of the transmission shaft penetrates through the driven pulley and is fixedly connected to it through a key. The transmission shaft is sequentially connected with a first cam, a second cam, a third cam, a fourth cam, and a fifth cam from left to right. A left pressing knife is arranged below the second cam, a middle pressing knife is arranged below the third cam. The middle pressing knife includes a cutting knife and a friction head, where the cutting knife is located on the left side of the friction head. A right pressing knife is arranged below the fourth cam. The tool cavity is fixedly connected to the box body. The left pressing knife, the middle pressing knife, and the right pressing knife are all clamped in the tool cavity and can move in the vertical direction. The friction servo motor is fixedly connected to the box body. The friction servo motor is connected to the friction head through a second belt, a friction pulley, and an eccentric structure. The continuous rotation of the friction servo motor drives the reciprocating movement of the friction head in the front and back directions.

[0014] Preferably, the in-place detection mechanism includes a detection block and an in-place photoelectric sensor. The in-place photoelectric sensor is located at the top of the detection block. When the PET belt is conveyed forward, the PET belt bypasses the goods to be strapped around the belt path by the small fin assembly and then enters the large fin assembly to continue moving forward. When the head of the PET belt touches the detection block, the detection block rotates slightly towards the in-place photoelectric sensor side and is detected by the in-place photoelectric sensor, and the signal is fed back to the PLC control system. At this time, an overlapping section is formed on the top of the goods to be strapped, and this overlapping section is located below the medium pressure knife.

[0015] The present invention also provides a strapping method using the PET belt strapping machine, which is characterized in that the strapping method includes the following steps:

[0016] S1, before threading the belt, lower the movement mechanism to the set position so that the inlet of the large fin assembly and the outlet of the small fin assembly are flush with the belt path;

[0017] S2, start the high-tension servo motor and the belt feeding servo motor forward. The PET belt in the material feeding track of the belt first passes through the high-tension pulley and then through the belt feeding pulley, bypasses the goods to be strapped around the belt path by the small fin assembly and then enters the large fin assembly, and continue to feed the belt. When the head of the PET belt touches the detection block, the detection block rotates slightly towards the in-place photoelectric sensor side and is detected by the in-place photoelectric sensor, and the signal is fed back from the in-place photoelectric sensor to the PLC control system, and stop the operation of the high-tension servo motor and the belt feeding servo motor;

[0018] S3, start the cam servo motor to drive the transmission shaft to rotate. When the second cam makes the left pressure knife in the lowest position, at this time the left pressure knife presses the PET belt tightly;

[0019] S4, start the high-tension servo motor and the belt feeding servo motor in reverse to enter the PET belt pulling-back and taking-up stage. At this time, the transmission shaft continues to rotate, and the first cam pushes the tightening connecting plate upwards, making the tightening connecting plate rotate around the connecting shaft. At this time, the high-tension gear rotates clockwise, driving the tightening gear to rotate counterclockwise, so that the PET belt between the tightening pulley and the high-tension pulley is tightened. When the reverse torque of the high-tension servo motor reaches the set value, stop the operation of the high-tension servo motor and the belt feeding servo motor;

[0020] S5, the transmission shaft continues to rotate. When the fourth cam makes the right pressure knife press down to the lowest position to press the PET belt tightly, at this time the left pressure knife maintains the pressing state. At this time, the first cam is separated from the tightening connecting plate, and the tightening mechanism resets. The transmission shaft continues to rotate, and the third cam makes the medium pressure knife press down. During this process, the cutting knife cuts the PET belt on the upper layer of the overlapping section;

[0021] S6. The medium-pressure knife continues to press down. The friction head contacts the PET belt. The friction servo motor is started, driving the friction head to move back and forth in the front-back direction, fusing the upper and lower layers of the PET belt in the overlapping section.

[0022] S7. After a preset time, the operation of the friction servo motor is stopped.

[0023] S8. The transmission shaft continues to rotate. The fifth cam lifts the hatch assembly, opening the hatch assembly, causing the movement mechanism to move upward. The PET belt disengages from the large fin assembly and the small fin assembly, resetting the second, third, fourth, and fifth cams. At this time, the left pressure knife, the medium-pressure knife, and the right pressure knife are all reset, and the bundling operation is completed as a whole.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention provides a PET belt bundling machine and method with a highly integrated structure, precise control, and highly optimized action process, achieving precise coordination of multiple key actions such as pressing, tightening, cutting, and welding with a set of cam systems as the main guide, significantly improving the automation level, stability, and bundling quality of the bundling operation.

[0026] (2) Through the coordinated cooperation of the cam driving device and the cam transmission component, the present invention uses a set of coaxial cams and a single cam servo motor to achieve time-sharing and sequential driving of multiple execution components such as the left pressure knife, the right pressure knife, the medium-pressure knife, and the tightening mechanism, greatly simplifying the transmission chain and making the overall structure of the machine more compact and reliable. Also, through the optimized layout of functional components (such as placing the tape feed wheel below the high-tension wheel), the tape path is streamlined, unnecessary guiding structures are reduced, and the tape threading resistance is lowered. Specifically, after starting the cam servo motor, its power is transmitted to the transmission shaft through the transmission belt. The first to fifth cams on the transmission shaft rotate accordingly, lifting the corresponding components such as the left pressure knife, the right pressure knife, the medium-pressure knife, and the tightening mechanism, and completing their respective actions in a preset time sequence, realizing the centralized control of a single power source for multiple mechanical actions.

[0027] (3) Through the coordinated cooperation of the high-tension pulley assembly, the tape-feeding pulley assembly, and the PLC control system, the present invention effectively prevents the accumulation of the tape during the tape-feeding process and the interference of the tape during the pulling-back process through the speed difference control of the high-tension servo motor and the tape-feeding servo motor, ensuring the smoothness of the conveying and tightening processes. Moreover, it ingeniously utilizes the torque feedback of the high-tension servo motor to accurately judge the magnitude of the tightening force, realizing the closed-loop control of the tension force and ensuring that the tightness of each bundling is consistent and just right. Specifically, during tape-feeding, the PLC control system sets the linear speed V1 of the tape-feeding pulley to be greater than the linear speed V2 of the high-tension pulley, forming a speed difference to facilitate the smooth feeding of the tape. During the pulling-back and tightening process, the linear speed V4 of the high-tension pulley is set to be greater than the linear speed V3 of the tape-feeding pulley to efficiently retract the tape. At the same time, the PLC system continuously monitors the torque of the high-tension servo motor. Once the preset tightening torque value is reached, the motor is immediately stopped, thereby achieving precise tightening.

[0028] (4) Through the design of the medium-pressure knife, the cam drive assembly, and the friction servo motor, the present invention successfully integrates the cutting knife for cutting and the friction head for welding onto the medium-pressure knife and precisely controls its descending process through the cam, realizing the seamless connection of the pressing-cutting-welding actions. Moreover, the independent friction servo motor is specifically used to drive the friction head, making its reciprocating motion independent of the rotational speed of the main transmission shaft, and the two do not affect each other, ensuring the welding quality and efficiency. Specifically, when the third cam drives the medium-pressure knife to press down, the cutting knife on it first contacts and cuts the upper PET tape, and then the friction head contacts the overlapping tape layer. At this time, the independent friction servo motor starts, and drives the friction head to reciprocate at high speed through the eccentric structure to complete the welding, ensuring clean cutting and sufficient welding. Brief Description of the Drawings

[0029] Figure 1 is the overall structural schematic diagram of the present invention;

[0030] Figure 2 is the structural schematic diagram of the movement core of the present invention when the outer cover plate is removed;

[0031] Figure 3 is the present invention Figure 2 schematic diagram from another perspective;

[0032] Figure 4 is the structural schematic diagram of the box body of the present invention;

[0033] Figure 5 is the structural schematic diagram of the tightening mechanism of the present invention;

[0034] Figure 6 is the structural schematic diagram of the tape inlet track of the present invention;

[0035] Figure 7 is the connection schematic diagram of the tightening mechanism and the high-tension pulley assembly of the present invention;

[0036] Figure 8 is the present invention Figure 7 Schematic diagram of the structure for removing the high-tension pulley

[0037] Figure 9 Schematic diagram of the structure of the detection-in-place mechanism and the hatch assembly of the present invention

[0038] Figure 10 Schematic diagram of the structure of the cam drive assembly of the present invention

[0039] Figure 11 is the present invention Figure 10 partial enlarged view

[0040] Figure 12 Schematic diagram of the overlapping section formed by the PET belt of the present invention

[0041] In the figure: 1. Goods to be packed; 2. Belt path; 3. Movement; 100. Frame assembly; 110. Box body; 120. Connecting shaft; 130. High-tension support plate; 140. Hatch assembly; 150. Large fin assembly; 160. Small fin assembly; 170. Top side displacement buffer structure; 200. Tightening mechanism; 210. Tightening connection plate; 220. Tightening wheel; 230. Tightening gear; 300. Tape feeding track; 400. High-tension pulley assembly; 410. High-tension servo motor; 420. High-tension speed reducer; 430. High-tension pulley; 440. High-tension gear; 500. Tape feeding wheel assembly; 510. Tape feeding wheel; 520. Tape feeding servo motor; 530. Tensioning mechanism; 600. Cam drive device; 610. Cam servo motor; 620. Cam speed reducer; 630. Driving pulley; 640. Driven pulley; 650. First belt; 700. Cam drive assembly; 710. Transmission shaft; 720. First cam; 730. Second cam; 740. Third cam; 750. Fourth cam; 750a. Fifth cam; 760. Left pressing knife; 770. Middle pressing knife; 771. Cutting knife; 772. Friction head; 780 Right pressing knife; 790. Tool cavity; 800. Detection-in-place mechanism; 810. Detection block; 820. In-place photoelectric sensor; 900. Friction servo motor. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., which indicate the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] It should be understood that in the description of the invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense.

[0045] Embodiment 1: Refer to the appendix Figures 1 to 12 , a PET belt strapping machine provided in this Embodiment 1 includes goods to be packaged 1, a belt path 2, and a machine core 3. The machine core 3 includes a frame assembly 100, a tightening mechanism 200, a tape feeding track 300, a high-tension pulley assembly 400, a tape feeding pulley assembly 500, a cam driving device 600, a cam transmission assembly 700, a detection-in-place mechanism 800, a friction servo motor 900, and a PLC control system; the tape feeding track 300 is fixedly connected to the frame assembly 100, the tightening mechanism 200 is rotatably connected to the frame assembly 100, the tape feeding track 300 passes through the tightening mechanism 200 and is located at the top of the high-tension pulley assembly 400, both the high-tension pulley assembly 400 and the tape feeding pulley assembly 500 are connected to the frame assembly 100, the tape feeding pulley assembly 500 is located below the high-tension pulley assembly 400, the cam driving device 600 is located on the right side of the frame assembly 100 and is connected thereto, the cam transmission assembly 700 is located inside the frame assembly 100, the cam transmission assembly 700 is connected to the cam driving device 600, and the detection-in-place mechanism 800 is connected to the frame assembly 100.

[0046] The frame assembly 100 includes a box body 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, a top-side displacement buffer structure 170, and a number of peripheral cover plates. The box body 110 is the support framework of the frame assembly 100, the connecting shaft 120 is connected to the box body 110, the high-tension support plate 130 is connected to the box body 110, the connecting shaft 120 passes through the high-tension support plate 130, the hatch assembly 140 is located at the front of the box body 110 and is connected thereto, both the large fin assembly 150 and the small fin assembly 160 are connected to the hatch assembly 140, and the top-side displacement buffer structure 170 is located at the top of the box body 110 and is connected thereto.

[0047] It should be noted that an opening groove is provided at the top of the belt path 2. The machine core 3 of the present invention can be made height-adjustable through a lifting mechanism (not shown in the figure). When the machine core 3 of the present invention works, the inlet of the large fin assembly 150 is flush with the belt path, and the outlet of the small fin assembly 160 is flush with the belt path 2.

[0048] The tightening mechanism 200 includes a tightening connecting plate 210, a tightening pressing plate, a tightening wheel 220 and a tightening gear 230. The tightening connecting plate 210 is of an L-shaped structure. The connecting shaft 120 passes through the tightening connecting plate 210. An opening slot for the tape track is formed at the top of the tightening connecting plate 210. Through the opening slot for the tape track, the tape inlet track 300 of the tape passes through the tightening connecting plate 210. The number of the tightening pressing plate, the tightening wheel 220 and the tightening gear 230 is two. The tightening wheel 220 and the tightening gear 230 are coaxially arranged. The tape inlet track 300 of the tape is fixedly connected to the box body 110, and the tape inlet track 300 of the tape is of an arc-shaped structure.

[0049] The high-tension pulley assembly 400 includes a high-tension servo motor 410, a high-tension speed reducer 420, a high-tension pulley 430 and a high-tension gear 440. One end of the high-tension speed reducer 420 is connected to the high-tension servo motor 410, and the other end is fixedly connected to the box body 110. The protruding shaft of the high-tension speed reducer 420 sequentially passes through the high-tension pulley 430, the high-tension gear 440 and the high-tension support plate 130 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 tightening gear 230.

[0050] It should be noted that when the PET tape pulls back and winds the goods 1 to be packed, since one end of the PET tape is fixed, it is necessary to judge whether the PET tape is tightened by monitoring the magnitude of the reverse torque value of the high-tension servo motor 410. Usually, the torque signal is fed back to the PLC control system by the driver of the high-tension servo motor 410.

[0051] The tape feeding pulley assembly 500 includes a tape feeding pulley 510, a tape feeding servo motor 520 and a tensioning mechanism 530. The tape feeding servo motor 520 is fixedly connected to the box body 110. The protruding shaft of the tape feeding servo motor 520 passes through the tape feeding pulley 510 and is connected to the frame assembly 100 through a bearing. The tensioning mechanism 530 is located on the left side of the tape feeding pulley 510, and the pressure borne by the PET tape is adjusted through the tensioning mechanism 530.

[0052] When the PET tape is fed forward, there is the following relationship between the linear velocity V1 of the PET tape at the tape feeding pulley assembly 500 and its linear velocity V2 at the high-tension pulley assembly 400: V1 > V2; when the PET tape is tightened in the reverse direction to bind the goods 1 to be packed, there is the following relationship between the linear velocity V3 of the PET tape at the tape feeding pulley assembly 500 and its linear velocity V4 at the high-tension pulley assembly 400: V3 < V4; and V1 > V4, V2 > V3.

[0053] The cam drive device 600 includes a cam servo motor 610, a cam speed reducer 620, a driving pulley 630, a driven pulley 640, and a first belt 650. One end of the cam speed reducer 620 is connected to the cam servo motor 610, and the other end is fixedly connected to the box body 110. The protruding shaft of the cam speed reducer 620 passes through the driving pulley 630 and is fixedly connected thereto by a key. The driving pulley 630 drives the driven pulley 640 to rotate through the first belt 650.

[0054] The cam transmission assembly 700 includes a transmission shaft 710 and a tool cavity 790. The right end of the transmission shaft 710 passes through the driven pulley 640 and is fixedly connected thereto by a key. The transmission shaft 710 is sequentially connected with a first cam 720, a second cam 730, a third cam 740, a fourth cam 750, and a fifth cam 750a from left to right. A left tool pressing member 760 is arranged below the second cam 730, a middle tool pressing member 770 is arranged below the third cam 740. The middle tool pressing member 770 includes a cutting tool 771 and a friction head 772. The cutting tool 771 is located on the left side of the friction head 772, and the height of the lowest point of the cutting tool 771 is higher than the height of the lowest point of the friction head 772. A right tool pressing member 780 is arranged below the fourth cam 750. The tool cavity 790 is fixedly connected to the box body 110. The left tool pressing member 760, the middle tool pressing member 770, and the right tool pressing member 780 are all engaged with the tool cavity 790 and can move in the up and down directions. The friction servo motor 900 is fixedly connected to the box body 110. 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 reciprocating movement of the friction head 772 in the front and back directions.

[0055] It is not difficult to understand that when multiple cams are connected to the same transmission shaft 710, since the contour shapes and phases of each cam may be different, their motion laws will also be different. When the transmission shaft 710 rotates continuously, the followers of different cams will be lifted or kept stationary in different time periods. This difference is determined by the contour shapes and phases of the cams, so that in a specific stage, the followers of some cams change their positions, while others may be stationary or have minor position changes. This characteristic enables multiple cams to achieve complex motion control on the same transmission shaft 710 to meet different mechanical transmission requirements. Since the cam contour design belongs to the existing mature technology, it will not be elaborated here.

[0056] The in-place detection mechanism 800 includes a detection block 810 and an in-place photoelectric sensor 820. The in-place photoelectric sensor 820 is located at the top of the detection block 810. When the PET belt is conveyed forward, the PET belt passes through the small fin assembly 160, winds around the goods to be packed 1 via the belt path 2, and then enters the large fin assembly 150 to continue moving forward. When the head of the PET belt touches the detection block 810, the detection block 810 makes a small rotation towards the in-place photoelectric sensor 820, which is detected by the in-place photoelectric sensor 820, and the signal is fed back to the PLC control system. At this time, an overlapping section is formed at the top of the goods to be packed 1 by the PET belt.

[0057] It should be noted that, as shown in the attached Figure 12 figure, figure a is the PET belt conveyed into the small fin assembly 160 through the belt feeding wheel 510, and figure b is the PET belt entering the detection block 810 from the large fin assembly 150. a is above b, and an overlapping section is formed between the two. This overlapping section is located below the medium pressure knife 770. Referring to the attached Figure 12 figure again, it can be seen that when the left pressure knife 760 is fully pressed down, the left pressure knife 760 has no contact with this overlapping section. Similarly, when the right pressure knife 780 is fully pressed down, the right pressure knife 780 has no contact with this overlapping section. Since the lowest point of the cutting knife 771 is higher than the lowest point of the friction head 772, the cutting knife 771 only cuts the PET belt at the top of this overlapping section. Usually, a corresponding grooved pattern plate is arranged below the friction head 772, and the friction head 772 is driven by the friction servo motor 900 to move back and forth in the front-rear direction to fuse the upper and lower layers of the PET belt in the overlapping section, which belongs to the existing mature technology and will not be elaborated here.

[0058] The present invention also provides a method for bundling using a PET belt bundling machine. This bundling method includes the following steps:

[0059] S1, before threading the belt, lower the movement mechanism 3 to the set position so that the inlet of the large fin assembly 150 and the outlet of the small fin assembly 160 are flush with the belt path 2;

[0060] S2, start the high-tension servo motor 410 and the belt feeding servo motor 520 in the forward direction. The PET belt in the material feeding track 300 of the belt first passes through the high-tension wheel 430 and then through the belt feeding wheel 510, winds around the goods to be packed 1 via the belt path 2 through the small fin assembly 160, and then enters the large fin assembly 150. Continue to feed the belt. When the head of the PET belt touches the detection block 810, make the detection block 810 make a small rotation towards the in-place photoelectric sensor 820, which is detected by the in-place photoelectric sensor 820, and the signal is fed back to the PLC control system by the in-place photoelectric sensor 82, and stop the operation of the high-tension servo motor 410 and the belt feeding servo motor 520;

[0061] S3. Start the cam servo motor 610 to drive the transmission shaft 710 to rotate. When the second cam 730 positions the left pressing knife 760 at the lowest position, the left pressing knife 760 presses the PET tape tightly at this time.

[0062] S4. Reverse-start the high-tension servo motor 410 and the tape-feeding servo motor 520 to enter the stage of pulling back and taking up the PET tape. At this time, the transmission shaft 710 continues to rotate. 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 tightening gear 230 to rotate counterclockwise, so that the PET tape between the tightening 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, stop the operation of the high-tension servo motor 410 and the tape-feeding servo motor 520.

[0063] S5. The transmission shaft 710 continues to rotate. When the fourth cam 750 presses the right pressing knife 780 down to the lowest position to press the PET tape tightly, the left pressing knife 760 maintains the pressing state at this time. At this time, the first cam 720 disengages from the tightening connecting plate 210, and the tightening mechanism 200 resets. The transmission shaft 710 continues to rotate, and the third cam 740 presses the middle pressing knife 770 down. During this process, the cutting knife 771 cuts the PET tape on the upper layer of the overlapping section.

[0064] S6. The middle pressing knife 770 continues to press down, and the friction head 772 contacts the PET tape. Start the friction servo motor 900 to drive the friction head 772 to move back and forth in the front-rear direction, so that the upper and lower layers of the PET tape in the overlapping section are fused.

[0065] S7. After a preset time, stop the operation of the friction servo motor 900.

[0066] S8. The transmission shaft 710 continues to rotate. The fifth cam 750a lifts the hatch assembly 140, opens the hatch assembly 140, causes the movement mechanism 3 to move upward, the PET tape disengages from the large fin assembly 150 and the small fin assembly 160, and resets the second cam 730, the third cam 740, the fourth cam 750, and the fifth cam 750a. At this time, the left pressing knife 760, the middle pressing knife 770, and the right pressing knife 780 all reset, and the bundling action is completed as a whole.

[0067] It should be noted that when the movement mechanism 3 descends to the set position in step S1, it is necessary to determine whether the PET tape connected to the unwinding mechanism is the first tape feeding or non-first tape feeding. If it is the first tape feeding, only the first time requires manual tape feeding to feed the PET tape to the lower part of the tape-feeding wheel 510.

[0068] It should be noted that in step S8, the purpose of jacking up and opening the hatch assembly 140 is to separate the PET belt from the movement 3. When the PET belt is separated from the large fin assembly 150, under the action of an external force, the large fin assembly 150 is flipped outward by a certain angle through the spring of the large fin assembly 150, so that the PET belt is separated from the large fin assembly 150. The separation of the PET belt from the small fin assembly 160 is achieved in the same way. Moreover, the separation of the PET belt from the large fin assembly 150 and the small fin assembly 160 both belong to existing mature technologies and will not be elaborated here.

[0069] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PET belt strapping machine, comprising goods to be packaged (1) and a belt path (2), characterized in that, It further includes a movement (3), and the movement (3) includes a frame assembly (100), a tightening mechanism (200), a tape feeding track (300), a high-tension pulley assembly (400), a tape feeding pulley assembly (500), a cam driving device (600), a cam transmission assembly (700), a detection-in-place mechanism (800), a friction servo motor (900) and a PLC control system; the tightening mechanism (200) is rotatably connected to the frame assembly (100), the tape feeding track (300) penetrates through the tightening mechanism (200) and is located at the top of the high-tension pulley assembly (400), the tape feeding pulley assembly (500) is located below the high-tension pulley assembly (400), the cam driving device (600) is located on the right side of the frame assembly (100) and is connected thereto, the cam transmission assembly (700) is located inside the frame assembly (100), the cam transmission assembly (700) is connected to the cam driving device (600), and the detection-in-place mechanism (800) is connected to the frame assembly (100).

2. The PET belt strapping machine according to claim 1, characterized in that, The frame assembly (100) includes a box body (110), a connecting shaft (120), a high-tension support plate (130), a hatch door assembly (140), a large fin assembly (150), a small fin assembly (160), a top side displacement buffer structure (170) and a plurality of peripheral cover plates, the connecting shaft (120) is connected to the box body (110), the high-tension support plate (130) is connected to the box body (110), the connecting shaft (120) penetrates through the high-tension support plate (130), the hatch door assembly (140) is located at the front of the box body (110) and is connected thereto, and the top side displacement buffer structure (170) is located at the top of the box body (110) and is connected thereto.

3. The PET belt strapping machine according to claim 2, wherein, The tightening mechanism (200) includes a tightening connecting plate (210), a tightening pressing plate, a tightening wheel (220) and a tightening gear (230), the tightening connecting plate (210) is of an L-shaped structure, the connecting shaft (120) penetrates through the tightening connecting plate (210), a tape track opening groove is formed at the top of the tightening connecting plate (210), and through the tape track opening groove, the tape feeding track (300) penetrates through the tightening connecting plate (210), the tape feeding track (300) is fixedly connected to the box body (110), and the tape feeding track (300) is of an arc-shaped structure.

4. The PET belt strapping machine according to claim 3, wherein, The high-tension pulley assembly (400) includes a high-tension servo motor (410), a high-tension speed reducer (420), a high-tension pulley (430), and a high-tension gear (440); one end of the high-tension speed reducer (420) is connected to the high-tension servo motor (410), and the other end is fixedly connected to the box body (110). The extending shaft of the high-tension speed reducer (420) sequentially passes through the high-tension pulley (430), the high-tension gear (440), and the high-tension support plate (130) 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 tightening gear (230).

5. The PET belt strapping machine according to claim 4, characterized in that, The belt-feeding pulley assembly (500) includes a belt-feeding pulley (510), a belt-feeding servo motor (520), and a tensioning mechanism (530). The belt-feeding servo motor (520) is fixedly connected to the box body (110). The extending shaft of the belt-feeding servo motor (520) passes through the belt-feeding pulley (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-feeding pulley (510), and the pressure borne by the PET belt is adjusted through the tensioning mechanism (530).

6. The PET belt strapping machine according to claim 5, characterized in that, When the PET belt is fed forward, there is the following relationship between the linear velocity V1 of the PET belt at the belt-feeding pulley assembly (500) and its linear velocity V2 at the high-tension pulley assembly (400): V1 > V2; when the PET belt is used to tightly bind the goods to be packaged (1) in the reverse direction, there is the following relationship between the linear velocity V3 of the PET belt at the belt-feeding pulley assembly (500) and its linear velocity V4 at the high-tension pulley assembly (400): V3 < V4; and V1 > V4, V2 > V3.

7. The PET belt strapping machine according to claim 5, wherein The cam driving device (600) includes a cam servo motor (610), a cam speed reducer (620), a driving pulley (630), a driven pulley (640), and a first belt (650). One end of the cam speed reducer (620) is connected to the cam servo motor (610), and the other end is fixedly connected to the box body (110). The extending shaft of the cam speed reducer (620) passes through the driving pulley (630) and is fixedly connected to it through a key. The driving pulley (630) drives the driven pulley (640) to rotate through the first belt (650).

8. The PET belt strapping machine according to claim 7, characterized in that, The cam drive assembly (700) includes a drive shaft (710) and a tool cavity (790). The right end of the drive shaft (710) passes through the driven pulley (640) and is fixedly connected thereto by a key. The drive shaft (710) sequentially passes through and is connected with a first cam (720), a second cam (730), a third cam (740), a fourth cam (750), and a fifth cam (750a) from left to right. A left tool press (760) is disposed below the second cam (730). A middle tool press (770) is disposed below the third cam (740). The middle tool press (770) includes a cutting tool (771) and a friction head (772), wherein the cutting tool (771) is located on the left side of the friction head (772). A right tool press (780) is disposed below the fourth cam (750). The tool cavity (790) is fixedly connected to the box body (110). The left tool press (760), the middle tool press (770), and the right tool press (780) are all engaged in the tool cavity (790) and can move in the vertical direction. The friction servo motor (900) is fixedly connected to the box body (110). 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 reciprocating movement of the friction head (772) in the front and rear directions.

9. The PET belt strapping machine according to claim 8, wherein, The detection-in-place mechanism (800) includes a detection block (810) and a in-place photoelectric sensor (820). The in-place photoelectric sensor (820) is located at the top of the detection block (810). When the PET belt is fed forward, the PET belt bypasses the goods to be strapped (1) through the small fin assembly (160) and the belt path (2) and then enters the large fin assembly (150) to continue moving forward. When the head of the PET belt contacts the detection block (810), the detection block (810) makes a slight rotation toward the in-place photoelectric sensor (820) and is detected by the in-place photoelectric sensor (820), and a signal is fed back to the PLC control system. At this time, an overlapping section is formed at the top of the goods to be strapped (1) by the PET belt, and this overlapping section is located below the middle tool press (770).

10. The bundling method of the PET belt bundling machine according to any one of claims 1-9, characterized in that, This strapping method includes the following steps: S1, before threading the belt, lower the movement mechanism (3) to a set position so that the inlet of the large fin assembly (150) and the outlet of the small fin assembly (160) are flush with the belt path (2); S2. Start the high-tension servo motor (410) and the belt-feeding servo motor (520) in the forward direction. The PET belt in the material-inlet track (300) of the belt first passes through the high-tension pulley (430) and then through the belt-feeding pulley (510). After surrounding the goods to be packaged (1) once through the belt path (2) by the small fin assembly (160), it enters the large fin assembly (150). Continue to feed the belt. When the head of the PET belt touches the detection block (810), the detection block (810) makes a slight rotation towards the in-place photoelectric sensor (820) side and is detected by the in-place photoelectric sensor (820). The in-place photoelectric sensor (820) feeds back the signal to the PLC control system to stop the operation of the high-tension servo motor (410) and the belt-feeding servo motor (520). S3. Start the cam servo motor (610) to drive the transmission shaft (710) to rotate. When the second cam (730) makes the left pressing knife (760) in the lowest position, at this time, the left pressing knife (760) presses the PET belt tightly. S4. Start the high-tension servo motor (410) and the belt-feeding servo motor (520) in the reverse direction to enter the PET belt pulling-back and belt-collecting stage. At this time, the transmission shaft (710) continues to rotate. The first cam (720) pushes the tightening connecting plate (210) upwards, making the tightening connecting plate (210) rotate around the connecting shaft (120). At this time, the high-tension gear (440) rotates clockwise, driving the tightening gear (230) to rotate counterclockwise, so that the PET belt between the tightening pulley (220) and the high-tension pulley (430) is tightened. When the reverse torque of the high-tension servo motor (410) reaches the set value, stop the operation of the high-tension servo motor (410) and the belt-feeding servo motor (520). S5. The transmission shaft (710) continues to rotate. When the fourth cam (750) makes the right pressing knife (780) press down to the lowest position to press the PET belt tightly, at this time, the left pressing knife (760) maintains the pressing state. At this time, the first cam (720) disengages from the tightening connecting plate (210), and the tightening mechanism (200) resets. The transmission shaft (710) continues to rotate. The third cam (740) makes the middle pressing knife (770) press down, and during this process, the cutting knife (771) cuts the upper layer of the overlapping section of the PET belt. S6. The middle pressing knife (770) continues to press down, and the friction head (772) contacts the PET belt. Start the friction servo motor (900) to drive the friction head (772) to move back and forth in the front and back directions to fuse the upper and lower layers of the overlapping section of the PET belt. S7. After a preset time, stop the operation of the friction servo motor (900). S8. The transmission shaft (710) continues to rotate. The fifth cam (750a) lifts the hatch assembly (140) to open the hatch assembly (140), making the movement mechanism (3) move upwards. The PET belt disengages from the large fin assembly (150) and the small fin assembly (160), and makes the second cam (730), the third cam (740), the fourth cam (750) and the fifth cam (750a) reset. At this time, the left pressing knife (760), the middle pressing knife (770) and the right pressing knife (780) all reset, and the bundling action is completed as a whole.

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