Square wrapping film machine and working method thereof

Abstract

The present invention relates to the technical field of film wrapping equipment, and discloses a square film wrapping machine and a working method thereof, comprising a main frame, a film loosening, clamping and cutting mechanism provided on the top; the film wrapping mechanism is rotatably arranged on the top of the main frame and is staggered with the film loosening, clamping and cutting mechanism, and is provided with a film roll frame body with a film roll mounting shaft, and a film stretching device composed of a pair of stretching rollers with different rotation speeds is provided on one side of the film roll mounting shaft, so as to clamp the film roll and realize film stretching through the rotation speed difference, and the subcontracting mechanism comprises a subcontracting frame correspondingly arranged below the film wrapping mechanism, and the subcontracting frame is rotatably connected with two groups of relatively arranged and V-shaped supporting rollers for adapting to and supporting the square bag, and the supporting rollers are driven by a gear set to realize that the supporting rollers drive the square bag to rotate stably when wrapping the film; the film can be continuously tightened during film wrapping, saving costs, and at the same time, it is only necessary to manually clamp the film end at the beginning of the first film wrapping, and no manual intervention is required subsequently, thereby greatly improving the degree of automation of the film wrapping work.

Description

Technical Field

[0001] The present invention relates to the technical field of film wrapping equipment, in particular to a square film wrapping machine and a working method thereof. Background Art

[0002] At present, many loose materials, especially crop straw, need to be compressed into bales for transportation and storage. However, existing equipment mostly compresses the materials into cylindrical straw rolls and wraps them with film. After wrapping, the materials are loaded onto trucks for transportation or storage.

[0003] Application number CN208484859U discloses a green feed film wrapping machine. It aims to address the problems of existing balers, such as low film wrapping efficiency, large size, and limited functionality. The proposed solution involves rotating the baling mechanism within the baling chamber, gradually wrapping the green feed into a round roll. Once a roll is formed, the feed feed is stopped. This solution is primarily intended for film wrapping round rolls of grass.

[0004] The inventors discovered that while packaging materials into round rolls compresses their volume, the cylindrical rolls, whether loaded or stored horizontally or vertically, waste space during transportation or storage. The gaps between the rolls cannot be effectively utilized, indirectly increasing transportation or storage costs. Compressing materials into cube-shaped or rectangular bales can fully utilize storage and transportation space. However, due to the shape of the bales, they cannot be adapted to rotating belts during film wrapping. Currently, most square bales are wrapped manually, which does not allow for full automation and results in low efficiency. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a square wrapping film machine and a working method thereof. The present invention is used to adapt to and support square bags by rotatably connecting two sets of oppositely arranged and V-shaped bag supporting rollers on a subcontracting frame. The V-shaped bag supporting rollers can effectively adapt to the shape of the square bags, support the square bags and drive the square bags to rotate smoothly, ensure that the center position of the square bags remains unchanged and will not fall off the subcontracting mechanism, realize the automation of the square wrapping film and improve work efficiency.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a square film wrapping machine, comprising:

[0008] The main frame is equipped with a film loosening, clamping and cutting mechanism on the top. Hydraulic cylinders are installed at both ends of the film loosening, clamping and cutting mechanism. A fixed film pressing plate and a film cutting knife are installed at the bottom of the hydraulic cylinder. A movable film pressing plate is installed at the output end of the hydraulic cylinder. The hydraulic cylinder drives the movable film pressing plate and the fixed film pressing plate to clamp the film and cut the film through the film cutting knife.

[0009] The film wrapping mechanism is rotatably arranged on the top of the main frame and is staggered with the film loosening, clamping and cutting mechanism. A film roll frame with a film roll mounting shaft is provided at both ends of the mechanism for mounting the film roll. A film stretching device consisting of a pair of stretching rollers with different rotation speeds is provided on one side of the film roll mounting shaft to clamp the film roll and achieve film stretching through the speed difference.

[0010] The subcontracting mechanism includes a subcontracting frame correspondingly arranged below the film wrapping mechanism. The subcontracting frame is rotatably connected to two sets of V-shaped bag supporting rollers that are oppositely arranged and used to adapt to and support square bales. The bag supporting rollers are driven by a gear set to ensure that the bag supporting rollers drive the square bales to rotate stably when wrapping.

[0011] As a further implementation method, a driving device is provided on the main frame, an output end of the driving device cooperates with the slewing support assembly, and the bottom end of the slewing support assembly is connected to the film wrapping mechanism.

[0012] As a further implementation method, the film wrapping mechanism includes a rotating bracket, the middle position of its top is connected to the rotary support assembly, the two ends are connected to the film roll frame, the film roll frame is rotatably connected to the film stretching device, and a clamping cylinder is provided on the film roll frame, and the output end of the clamping cylinder is connected to the film stretching device to adjust the position of the stretching roller.

[0013] As a further implementation method, two first hydraulic motors are provided on the subcontracting frame, and each bag supporting roller group includes two parallel bag supporting rollers. The output end of the first hydraulic motor cooperates with the corresponding bag supporting roller group through a driving gear group to drive the bag supporting roller to rotate, and the two ends of each bag supporting roller group are rotatably connected to the subcontracting frame through a connecting plate.

[0014] As a further implementation method, a bag turning mechanism is provided at the bottom of the subcontracting frame, and the bag turning mechanism includes a bag turning cylinder, whose top output end is hinged to the middle position of the bottom of the subcontracting frame, and the bottom end is hinged to the main frame. One end of the subcontracting frame is hinged to the main frame, and the other end is abutted against the main frame.

[0015] As a further implementation method, the film loosening and cutting mechanism includes a supporting beam with hydraulic cylinders at both ends. The hydraulic cylinders are coordinated with the pull rods through linear bearings. The pull rods are arranged parallel to the hydraulic cylinders. The bottom end of the pull rods passes through the fixed film pressure plate and is connected to the movable mold plate. A slot is provided on the movable film pressure plate, and a film cutting knife is provided at the slot.

[0016] As a further implementation method, a safety mechanism is installed on the rotating bracket, and the safety mechanism includes a safety beam, which extends to the outside of the wrapping mechanism. One end of the safety beam is hinged to the safety bracket, and the safety beam and the safety bracket are connected by a tension spring. A travel switch is provided on the safety beam, and the travel switch is linearly connected to the wrapping mechanism.

[0017] As a further implementation, a film breaking sensor is provided on the film stretching device.

[0018] As a further implementation, the film loosening, clamping and cutting mechanism is located inside the film wrapping mechanism.

[0019] In a second aspect, a method for operating a square film wrapping machine is provided, characterized in that the method comprises using any of the above-described square film wrapping machines, and comprising the following steps:

[0020] When wrapping the film for the first time, the film roll is manually installed on the film roll installation shaft, and the end of the film is passed through the stretching roller and fixed on the film loosening and cutting mechanism; the square bag is placed on the subcontracting mechanism, the rotating bracket rotates, and the square bag is wrapped with film. The subcontracting mechanism rotates at the same time to adjust the position of the square bag. After wrapping to the set number of layers, the film loosening and cutting mechanism loosens the film, and the rotating bracket continues to rotate. After reaching the set number of layers, the hydraulic cylinder extends, and the rotating bracket rotates another half a circle to make the film close to the hydraulic cylinder output rod. The hydraulic cylinder retracts, clamps the film with the fixed mold plate and the movable film pressing plate, and cuts the film through the film cutting knife. The bag turning cylinder extends and pushes the subcontracting mechanism to rotate. After the square bag wrapped with film is detached from the subcontracting mechanism, the bag turning cylinder returns to its position, and the subcontracting mechanism returns to its initial state and enters the next operation cycle.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The subcontracting machine frame of the present invention is rotatably connected with two sets of bag supporting rollers which are arranged opposite to each other and are in a V shape, and are used to adapt to and support square bags. The V-shaped bag supporting rollers can effectively adapt to the shape of the square bags, support the square bags and drive the square bags to rotate smoothly, and ensure that the center position of the square bags remains basically unchanged and will not fall off from the subcontracting mechanism, thereby realizing the automation of the square wrapping film; at the same time, through the arrangement of the film stretching device on the film wrapping mechanism, the film is continuously stretched by a pair of stretching rollers with different rotation speeds during the film wrapping process, ensuring that the film can be tightly wrapped on the square bags during the film wrapping process, saving film rolls, and realizing the loosening and breaking of the film, thereby improving work efficiency.

[0023] 2. After cutting the film, the film loosening, clamping and cutting mechanism of the present invention can use the fixed film pressure plate and the movable mold plate to clamp and fix the film end, so as to facilitate the temporary fixation of the film end in the subsequent film wrapping work. It is only necessary to manually place the film end on the fixed film pressure plate and the movable mold plate at the beginning of the first film wrapping, and no manual intervention is required subsequently, which greatly improves the degree of automation of the film wrapping work.

[0024] 3. The film stretching device of the present invention is rotatably connected to the film roll frame, and the film stretching device is pushed by the compression cylinder to adjust its position, so that the film can be tightened before wrapping.

[0025] 4. A travel switch is provided on the safety mechanism of the present invention so that when a person or an object accidentally touches the safety beam, the travel switch is triggered to immediately stop the film wrapping work, thereby improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 It is a schematic diagram of the overall structure of a square wrapping film machine according to one or more embodiments of the present invention;

[0028] Figure 2 is a schematic structural diagram of a subcontracting organization according to one or more embodiments of the present invention;

[0029] Figure 3 is a schematic structural diagram of a bag supporting roller according to one or more embodiments of the present invention;

[0030] Figure 4 is a schematic structural diagram of a bag turning mechanism according to one or more embodiments of the present invention;

[0031] Figure 5 is a schematic structural diagram of a film wrapping mechanism according to one or more embodiments of the present invention;

[0032] Figure 6 is a schematic structural diagram of a film roll support assembly according to one or more embodiments of the present invention;

[0033] Figure 7 is a schematic structural diagram of a film stretching device according to one or more embodiments of the present invention;

[0034] Figure 8 is a schematic structural diagram of a driving device according to one or more embodiments of the present invention;

[0035] Figure 9 is a schematic structural diagram of a film loosening, clamping and cutting mechanism according to one or more embodiments of the present invention;

[0036] Figure 10 is a schematic structural diagram of a safety mechanism according to one or more embodiments of the present invention.

[0037] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the diagram is for illustration only;

[0038] Among them, 1. Main frame; 2. Safety mechanism; 3. Film wrapping mechanism; 4. Film loosening, clamping and cutting mechanism; 5. Subcontracting mechanism; 6. Package turning mechanism;

[0039] 21. Safety beam; 22. Travel switch; 23. Tension spring; 24. Safety bracket;

[0040] 31. Rotating bracket; 32. Film roll bracket assembly; 321. Film roll mounting shaft; 322. Film roll bracket body; 323. Film break sensor; 324. Film stretching device; 325. Pressing cylinder; 326. First gear; 327. Second gear; 328. Mounting shaft; 329. Stretching roller bracket; 330. Stretching roller; 33. Driving device; 331. Second hydraulic motor; 332. Coupling; 333. Motor bracket; 334. Drive shaft; 335. Third gear; 34. Slewing support assembly;

[0041] 41. Support beam; 42. Pull rod; 43. Linear bearing; 44. Fixed film pressure plate; 45. Movable film pressure plate; 46. Film cutting knife; 47. Hydraulic cylinder;

[0042] 51. Subcontracting frame; 52. Driving gear set; 53. Package supporting roller set; 531. Package supporting roller; 532. Bearing; 54. Connecting plate; 55. First hydraulic motor;

[0043] 61. Turning cylinder; 62. Turning support; 63. First cylinder articulated seat; 64. Second cylinder articulated seat. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0045] Example 1

[0046] In a typical embodiment of the present invention, Figures 1-10 As shown, a square film wrapping machine is proposed, including a main frame 1 and a film wrapping mechanism 3 installed on the main frame 1, a film loosening, clamping and cutting mechanism 4, a subcontracting mechanism 5 and a bag turning mechanism 6, and a safety mechanism 2 is installed on the film wrapping mechanism 3.

[0047] Among them, the subcontracting mechanism 5 is installed on the crossbeam near the bottom of the main frame 1, one end of which is hinged to the main frame 1, and the other end is abutted against the main frame 1. The bag turning mechanism 6 is installed at the bottom of the subcontracting mechanism 5, one end of the bag turning mechanism 6 is hinged to the bottom of the main frame 1, and the output end of the other end is hinged to the subcontracting mechanism 5 near the middle position. The output end of the bag turning mechanism 6 can push the subcontracting mechanism 5, so that one end of the subcontracting mechanism 5 is lifted, so that the subcontracting mechanism 5 can unload the square bag.

[0048] A film wrapping mechanism 3 and a film unwinding, clamping, and cutting mechanism 4 are fixed to the top center of the main frame 1. The safety mechanism 2 is mounted on this mechanism. The two mechanisms are coaxially arranged and positioned outside of them. The film wrapping mechanism 3 rotates to wrap the square bales on the subcontracting mechanism 5. During the wrapping process, the safety mechanism 2 provides real-time protection, while the film unwinding, clamping, and cutting mechanism 4 is used to cut the film after wrapping is complete.

[0049] like Figure 1 As shown, a film loosening, clamping and cutting mechanism 4 is provided on the top of the main frame 1, and hydraulic cylinders 47 are provided at both ends of the film loosening, clamping and cutting mechanism 4. A fixed film pressure plate 44 is installed at the bottom end of the hydraulic cylinder 47, and a film cutting knife 46 is provided on one side of the fixed film pressure plate 44. A movable film pressure plate 45 is installed at the output end of the hydraulic cylinder 47. The hydraulic cylinder 47 drives the movable film pressure plate 45 to clamp the film with the fixed film pressure plate 44 and cut the film through the film cutting knife 46; the film wrapping mechanism 3 is rotatably set on the top of the main frame 1 and is staggered with the film loosening, clamping and cutting mechanism 4, and a film roll frame 322 with a film roll mounting shaft 321 is provided at both ends for mounting a film roll, and a film stretching device 324 composed of a pair of stretching rollers 330 with different rotation speeds is provided on one side of the film roll mounting shaft 321 to clamp the film roll and achieve film stretching through the rotation speed difference.

[0050] The subcontracting mechanism 5 is arranged below the film wrapping mechanism 3, and includes two sets of bag supporting rollers 53 arranged opposite to each other, which are used to support the square bag. The bag supporting rollers 53 are driven by the driving gear set 52 to realize that the bag supporting rollers 531 drive the square bag to rotate continuously when wrapping the film.

[0051] In this embodiment, the film roll end is clamped and cut by the film loosening and cutting mechanism 4, and the film wrapping mechanism 3 is rotated to wrap the other side of the film. The film stretching device 324 can tighten the film during the wrapping process, thereby solving the problems of film waste, poor wrapping quality and aesthetics of the square bag.

[0052] like Figure 1 and Figure 5 As shown, a driving device 33 is provided on the main frame 1, and the output end of the driving device 33 cooperates with the slewing support assembly 34. The bottom end of the slewing support assembly 34 is connected to the film wrapping mechanism. The driving device 33 is a second hydraulic motor 331, and a motor bracket 333 is provided at the bottom thereof for installation on the top of the main frame 1. It is connected to the driving shaft 334 through a coupling 332, and a third gear 335 is provided at the bottom of the driving shaft.

[0053] The slewing support assembly 34 is mounted on the main frame 1 via bearings. A driven gear is located at the bottom of the slewing support assembly 34, meshing with a third gear 335. The bottom of the driven gear is fixedly connected to the top center of the rotating bracket 31 via a flange. The second hydraulic motor 331, via the third gear 335, drives the rotating bracket 31 of the film wrapping mechanism 3 to rotate, thereby wrapping the side bags.

[0054] The film loosening, clamping and cutting mechanism 4 is fixed on the main frame 1 and does not rotate during the film wrapping process.

[0055] like Figure 5-Figure 7 As shown, the film wrapping mechanism 3 includes a rotating bracket 31, which is in an inverted U shape. The middle position of the top is connected to the rotary support assembly 34 so that the driven gear can drive the rotating bracket 31 to rotate. Its two ends (i.e., the two bottom ends) are connected to the film roll bracket assembly 32. The film roll bracket assembly 32 includes a film roll frame body 322. The film roll frame body 322 is provided with a film roll installation shaft 321 for installing the film roll. The film roll frame body 322 is rotatably connected to the film stretching device 324.

[0056] Among them, the film stretching device 324 includes two stretching roller brackets 329, and the two stretching roller brackets 329 are provided with a mounting shaft 328 at one end away from each other, which is rotatably connected to the film roll frame 322 through the mounting shaft 328. A pair of stretching rollers 330 are rotatably connected between the other ends of the two stretching roller brackets 329, including a first stretching roller and a second stretching roller. The two stretching rollers have the same thickness. A first gear 326 is set after the top of the first stretching roller passes through the stretching roller bracket 329, and a second gear 327 is set after the top of the second stretching roller passes through the stretching roller bracket 329. The first gear and the second gear are meshed, and the number of teeth of the two gears is different. Therefore, the rotation speeds of the two stretching rollers are different.

[0057] The two stretching roller brackets 329 are also fixedly connected by a connecting rod. A clamping cylinder 325 is provided on the film roll frame 322. The output end of the clamping cylinder 325 is connected to the connecting rod. The output rod of the clamping cylinder 325 is extended, and the stretching roller bracket 329 can be pushed by the connecting rod to rotate relative to the film roll frame 322, thereby clamping the film roll.

[0058] During film wrapping, the film roll passes between two stretching rollers. Because the two stretching rollers rotate at different speeds, they can stretch the film during wrapping, keeping it taut throughout the entire wrapping process. This effectively eliminates film roll waste and enhances the aesthetics of the wrapped bag. A sensor is provided on the rotating bracket 31 to detect the number of film wrapping turns. Each rotation of the bracket wraps one layer of film, allowing the next step to proceed after the set number of film layers has been wrapped.

[0059] like Figure 2-Figure 4As shown, the subcontracting mechanism 5 includes a subcontracting frame 51, which is located directly below the film wrapping mechanism 3 and is used to carry the square bag and rotate the square bag during film wrapping to adjust the film wrapping position of the square bag. The subcontracting frame is rotatably connected to two sets of bag supporting rollers that are oppositely arranged and in a V shape to adapt to and support the square bag.

[0060] Two first hydraulic motors 55 are provided on one side of the subcontracting frame 51. The first hydraulic motor 55 passes through the subcontracting frame 51 and is connected to the gear. The output end of the first hydraulic motor 55 cooperates with the bag supporting roller group 53 through the driving gear group 52 to drive the bag supporting roller 531 to rotate. The two ends of each bag supporting roller group are rotatably connected to the subcontracting frame through the connecting plate 54.

[0061] This embodiment features two sets of support rollers 53. Each set 53 includes two parallel support rollers 531. Each end of each support roller 531 is rotatably connected to one end of a connecting plate 54. The other end of the connecting plate 54 is rotatably connected to the subcontracting frame 51 via a bearing 532. A connecting rod is hingedly connected between the two connecting plates 54. Gears are provided at the ends of the support rollers 531, meshing with the gears at the output end of the first hydraulic motor 55 to form the drive gear set 52. The first hydraulic motor 55 drives the two support rollers 531 of each support roller set 53 to rotate in the same direction.

[0062] The two sets of bag-supporting rollers 53 are arranged in a V-shape, effectively adapting to the shape of the square bales. They support the bales and drive their smooth rotation, ensuring that their center remains essentially unchanged and they do not fall off the subcontracting mechanism. To begin wrapping, the bales are placed on the bag-supporting rollers 531 of the subcontracting mechanism 5, with the corner of the bale positioned between the two sets of bag-supporting rollers. The first hydraulic motor 55 drives the bag-supporting rollers 531 via the gear set 52, which in turn rotates the bales, adjusting their wrapping position and ensuring a fully oriented wrapping of the bales.

[0063] A bag turning mechanism 6 is provided at the bottom of the subcontracting frame, and the bag turning mechanism 6 includes a bag turning cylinder 61, the top output end of which is hinged to the middle position of the bottom of the subcontracting frame 51 through a first cylinder hinge seat 63, and the bottom end is hinged to the main frame 1 through a second cylinder hinge seat 64. One end of the subcontracting frame 51 is hinged to the main frame 1 through a flip support 62, and the other end is abutted against the main frame. When the output end of the bag turning cylinder 61 extends upward, it can push the end of the subcontracting frame 51 abutting against the main frame 1 to lift up, thereby realizing the flipping of the subcontracting frame 51 to the set angle, so that the square bag can be unloaded after the film wrapping is completed.

[0064] like Figure 9As shown, the film loosening, clamping and cutting mechanism 4 includes a supporting beam 41. The top center position of the supporting beam 41 is fixed on the main frame 1. It is also U-shaped, with hydraulic cylinders 47 at both ends. The hydraulic cylinder 47 is vertically arranged with the output end downward. The hydraulic cylinder 47 cooperates with the pull rod through the side linear bearing 43. The pull rod 42 is arranged parallel to the hydraulic cylinder 47. The bottom end of the pull rod 42 passes through the linear bearing on the fixed film pressure plate 44 and is connected to the movable mold plate 45. A corresponding notch is opened on the movable film pressure plate 45, and a film cutting knife is provided at the notch. The fixed film pressure plate 44 is used to cooperate with the movable film pressure plate 45 to clamp the film, and the film cutting knife is used to cut the film at the notch.

[0065] After the hydraulic cylinder 47 is extended, the fixed film pressing plate 44 and the movable mold plate 45 are separated, and the film roll is loosened. After the hydraulic cylinder 47 is retracted, the fixed film pressing plate 44 and the movable mold plate 45 can clamp the film roll, and the film cutting knife can cut the film.

[0066] After cutting the film, the film loosening, clamping and cutting mechanism 4 can use the fixed film pressing plate 44 and the movable mold plate 45 to clamp and fix the film end, so as to facilitate the temporary fixation of the film end in the subsequent film wrapping work. It is only necessary to manually place the film end on the fixed film pressing plate 44 and the movable mold plate 45 at the beginning of the first film wrapping, and no manual intervention is required subsequently, which greatly improves the degree of automation of the film wrapping work.

[0067] It should be noted that during film winding, the film unwinding and cutting mechanism 4 needs to be above the film roll support assembly 32 to prevent the film from being wound around the film unwinding and cutting mechanism 4 during film winding.

[0068] like Figure 10 As shown, a safety mechanism 2 is installed on the rotating bracket 31, and the safety mechanism includes a safety beam 21, which extends to the outside of the film wrapping mechanism. One end of the safety beam 21 is hinged to the safety bracket, and the safety beam 21 and the safety bracket are connected by a tension spring 23. A limit switch 22 is provided on the safety beam, and the limit switch 22 is linearly connected to the film wrapping mechanism. The safety beam 21 is hinged to the mounting bracket 24 and can rotate around the hinge axis. After rotation, it can be reset under the action of the tension spring 23. When someone accidentally enters or an object enters during the film wrapping process, it will first hit the outermost safety beam 21. The safety beam 21 rotates and triggers the limit switch. The limit switch can control the film wrapping mechanism to stop rotating, thereby ensuring safety during film wrapping.

[0069] It is understandable that the film stretching device is provided with a film breaking sensor 323, and when the film is broken, the film wrapping is stopped.

[0070] The subcontracting frame of this embodiment is rotatably connected to two sets of oppositely positioned V-shaped bag-supporting rollers for adapting to and supporting the square bag. The V-shaped bag-supporting rollers can effectively adapt to the shape of the square bag, support the square bag, and drive the square bag to rotate smoothly, ensuring that the center of the square bag remains basically unchanged and does not fall off the subcontracting mechanism, thereby realizing the automation of the square film wrapping operation. The film stretching device provided on the film wrapping mechanism enables the film to be continuously stretched by a pair of stretching rollers with different rotation speeds during the film wrapping process, ensuring that the film can be tightly wrapped around the square bag during the film wrapping process and saving film rolls. After cutting the film, the film loosening and cutting mechanism 4 can clamp and fix the film end using the fixed film pressure plate and the movable mold plate to facilitate temporary fixation of the film end during subsequent film wrapping operations. The film end only needs to be manually placed on the fixed film pressure plate and the movable mold plate at the beginning of the first film wrapping operation, and no manual intervention is required thereafter, greatly improving the degree of automation of the film wrapping operation.

[0071] Example 2

[0072] A method for operating a square film wrapping machine, using the square film wrapping machine in Example 1, includes the following steps:

[0073] When wrapping the film for the first time, the film roll is manually installed on the film roll installation shaft 321, and the end of the film is passed through the stretching roller and fixed on the film loosening and cutting mechanism. The end of the film is clamped using the fixed film pressure plate and the movable film pressure plate, the clamping cylinder is extended, the film is tightened through the film stretching device, and then the square package is placed on the subcontracting mechanism.

[0074] When wrapping begins, the end of the film is first tightened and clamped on the film loosening and cutting mechanism 4. At this time, the bottom end of the hydraulic cylinder 47 is slightly higher than the film stretching device of the film wrapping mechanism 3. Then the rotating bracket 31 rotates to wrap the square bag. The subcontracting mechanism 5 simultaneously rotates through the bag supporting roller to adjust the position of the square bag. After wrapping to the first set number of layers, the film loosening and cutting mechanism loosens the film, and the rotating bracket continues to rotate. After the counting sensor detects that the second set number of layers has been reached, the hydraulic cylinder extends, and the rotating bracket rotates another half a circle to make the film close to the hydraulic cylinder output rod. The hydraulic cylinder retracts, clamps the fixed mold plate and the movable film pressure plate to the film, and cuts the film through the film cutting knife.

[0075] After that, the bag turning cylinder extends out and pushes the subcontracting mechanism to flip over. After the square bag wrapped with film is separated from the subcontracting mechanism, the bag turning cylinder returns to its position, and the subcontracting mechanism returns to its initial state and enters the next operation cycle. In subsequent operation cycles, there is no need to manually clamp the film. It is only necessary to manually place the film end on the fixed film pressure plate and the movable mold plate at the beginning of the first film wrapping. No manual intervention is required subsequently, which greatly improves the degree of automation of the film wrapping work.

[0076] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A square wrapping film machine, characterized in that, include: The main frame is equipped with a film loosening, clamping and cutting mechanism on the top. Hydraulic cylinders are installed at both ends of the film loosening, clamping and cutting mechanism. A fixed film pressing plate and a film cutting knife are installed at the bottom of the hydraulic cylinder. A movable film pressing plate is installed at the output end of the hydraulic cylinder. The hydraulic cylinder drives the movable film pressing plate and the fixed film pressing plate to clamp the film and cut the film through the film cutting knife. The film loosening, clamping and cutting mechanism includes a supporting crossbeam with hydraulic cylinders at both ends. The hydraulic cylinders cooperate with the pull rods through linear bearings. The pull rods are arranged parallel to the hydraulic cylinders. The bottom end of the pull rods passes through the fixed film pressing plate and is connected to the movable die pressing plate. The movable film pressing plate is provided with a notch, and a film cutting knife is provided at the notch. The film wrapping mechanism is rotatably arranged on the top of the main frame and is staggered with the film loosening, clamping and cutting mechanism. A film roll frame with a film roll mounting shaft is provided at both ends of the mechanism. A film stretching device consisting of a pair of stretching rollers with different rotation speeds is provided on one side of the film roll mounting shaft to clamp the film roll and achieve film stretching through the speed difference. The subcontracting mechanism includes a subcontracting frame correspondingly arranged below the film wrapping mechanism. The subcontracting frame is rotatably connected to two sets of V-shaped bag supporting rollers that are oppositely arranged and used to adapt to and support square bales. The bag supporting rollers are driven by a gear set to ensure that the bag supporting rollers drive the square bales to rotate stably when wrapping.

2. A square wrapping film machine according to claim 1, characterized in that, The main frame is provided with a driving device, the output end of the driving device cooperates with the rotary support component, and the bottom end of the rotary support component is connected to the film wrapping mechanism.

3. A square wrapping film machine according to claim 2, characterized in that: The film wrapping mechanism includes a rotating bracket, the middle position of the top of which is connected to the rotary support assembly, the two ends of which are connected to the film roll frame, the film roll frame is rotatably connected to the film stretching device, and a clamping cylinder is provided on the film roll frame, and the output end of the clamping cylinder is connected to the film stretching device to adjust the position of the stretching roller.

4. A square wrapping film machine according to claim 1, characterized in that: Two first hydraulic motors are provided on the subcontracting frame, and each bag supporting roller group includes two parallel bag supporting rollers. The output end of the first hydraulic motor cooperates with the corresponding bag supporting roller group through a driving gear group to drive the bag supporting roller to rotate. The two ends of each bag supporting roller group are rotatably connected to the subcontracting frame through a connecting plate.

5. A square wrapping film machine according to claim 4, characterized in that: A bag turning mechanism is provided at the bottom of the subcontracting frame, which includes a bag turning cylinder, a top output end of which is hinged to the middle position of the bottom of the subcontracting frame, and a bottom end is hinged to the main frame. One end of the subcontracting frame is hinged to the main frame, and the other end is in contact with the main frame.

6. A square wrapping film machine according to claim 3, characterized in that: A safety mechanism is installed on the rotating bracket, which includes a safety beam extending to the outside of the film wrapping mechanism. One end of the safety beam is hinged to the safety bracket, and the safety beam and the safety bracket are connected by a tension spring. A travel switch is provided on the safety beam, and the travel switch is linearly connected to the film wrapping mechanism.

7. A square wrapping film machine according to claim 3, characterized in that: The film stretching device is provided with a film breaking sensor.

8. The square wrapping film machine according to claim 1, characterized in that: The film loosening, clamping and cutting mechanism is located inside the film wrapping mechanism.

9. A method for operating a square wrapping film machine, characterized in that: The square wrapping film machine according to any one of claims 1 to 8 is used, comprising the following steps: When wrapping the film for the first time, the film roll is manually installed on the film roll installation shaft, and the end of the film is passed through the stretching roller and fixed on the film loosening and cutting mechanism; the square bag is placed on the subcontracting mechanism, the rotating bracket rotates, and the square bag is wrapped with film. The subcontracting mechanism rotates at the same time to adjust the position of the square bag. After wrapping to the set number of layers, the film loosening and cutting mechanism loosens the film, and the rotating bracket continues to rotate. After reaching the set number of layers, the hydraulic cylinder extends, and the rotating bracket rotates another half a circle to make the film close to the hydraulic cylinder output rod. The hydraulic cylinder retracts, the fixed mold plate and the movable film pressing plate clamp the film and cut the film through the film cutting knife. The bag turning cylinder extends and pushes the subcontracting mechanism to rotate. After the square bag wrapped with film is detached from the subcontracting mechanism, the bag turning cylinder returns to its position, the subcontracting mechanism returns to its initial state, and enters the next operation cycle.

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