Film sleeving device with opening two-way adjusting function

Abstract

The invention relates to the field of material packaging, in particular to a film sleeving device with an opening two-way adjusting function, the film sleeving device comprises a supporting mechanism, a discharging mechanism, a bag opening mechanism, a film sleeving mechanism and a conveying mechanism, and the supporting mechanism comprises a bearing stand column, a sliding frame moving in the length direction of the bearing stand column and a bearing top plate fixedly arranged at the top of the bearing stand column; the discharging mechanism comprises a feeding roller, a conveying roller set and a cutting assembly. The bag opening mechanism comprises two adsorption assemblies parallel to the conveying roller set, and the adsorption assemblies can move in the horizontal direction perpendicular to the conveying roller set. The film sleeving mechanism comprises stretching assemblies and two sliding frames parallel to the conveying roller set, each sliding frame is provided with the two stretching assemblies, the stretching assemblies can move in the length direction of the sliding frames, the sliding frames are borne by a sliding frame, each sliding frame can move in the horizontal direction perpendicular to the conveying roller set, and the conveying mechanism comprises a conveying belt. The effect of adapting to materials of different sizes is achieved.

Description

Technical Field

[0001] This application relates to the field of material packaging, and in particular to a film sleeve device with bidirectional opening adjustment function. Background Technology

[0002] Sleeving is a crucial step in product packaging, affecting aspects such as appearance quality, protective performance, and production efficiency. With the increasing variety of products and rising market demands for packaging, the performance and adaptability of sleeved packaging equipment have become key factors influencing packaging quality and production efficiency. Highly efficient, precise, and adaptable sleeved packaging equipment can significantly improve packaging quality, reduce production costs, and play a vital role in enhancing product market competitiveness.

[0003] The existing automatic film-coating device's film-pulling assembly first clamps the four corners of the bag body, and then stretches it outward along the diagonals of the four corners, thereby changing the size of the bag opening. However, this is a linked stretching, and the length and width of the bag opening change in a fixed proportion, which cannot be adjusted independently. This results in the bag opening shape not matching the material, and the film-coating effect is not ideal. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a film covering device with bidirectional opening adjustment function.

[0005] A film-covering device with bidirectional opening adjustment function, comprising: The support mechanism includes four parallel supporting columns, a sliding frame that moves along the length of the supporting columns, and a supporting top plate fixed to the top of the supporting columns. The supporting top plate is provided with a discharge port for the bag to pass through. The discharging mechanism includes a feeding roller for winding the bag body, a conveying roller group for conveying the bag body, and a cutting assembly for cutting the bag body. The feeding roller is located on one side of the support mechanism, and the conveying roller group and the cutting assembly are both supported on the supporting top plate. The bag opening mechanism is located on the side of the supporting top plate away from the conveying roller group. The bag opening mechanism includes two adsorption components parallel to the conveying roller group. The adsorption components can move in a horizontal direction perpendicular to the conveying roller group. The film-making mechanism includes four stretching components and two sliding frames parallel to the conveyor roller group. Each sliding frame has two stretching components, which are movable along the length of the sliding frame. The sliding frame is supported by the sliding frame, and each sliding frame is movable in a horizontal direction perpendicular to the conveyor roller group. Each stretching component can clamp the opening edge of the bag body. A conveying mechanism, comprising a conveyor belt for conveying materials, the conveyor belt being located below the film-coating mechanism.

[0006] By adopting the above scheme, when the film-covering device is working, the conveyor belt transports the material to the location of the support mechanism. Then, the conveyor rollers transport the bag on the feeding rollers, allowing the bag to pass through the bearing top plate. Two adsorption components adsorb the two sides of the bag respectively. The adsorption components move in a horizontal direction away from the bag to unfold the bag. The unfolded bag moves to the location of the stretching components. Multiple stretching components clamp the opening edge of the bag. The stretching components move along the length direction of the sliding frame. The sliding frame drives the stretching components to slide in a horizontal direction perpendicular to the conveyor roller group. During this process, the opening of the bag is stretched by the film-covering mechanism into a shape that matches the projection surface of the material in the vertical direction. Finally, the sliding frame drives the film-covering mechanism to move downward along the length direction of the bearing column, thereby covering the surface of the material with the bag. Since the movement of the stretching components along the conveyor roller group and in a direction perpendicular to the conveyor roller group is independent of each other, the film-covering mechanism can stretch the opening of the bag to a shape that matches the length and width of the material, avoiding a mismatch between the shape of the bag opening and the length and width of the material.

[0007] In one embodiment, the conveying roller group has a plurality of transfer components on the side facing the feeding roller. The transfer components include two parallel transfer rollers. Each transfer roller includes a conveying part and a guiding part. The guiding part is parallel to the conveying roller group and is located on both sides of the conveying part and inclined away from the moving direction of the bag. When the conveying roller group conveys the bag, the bag is located between the two transfer rollers.

[0008] By adopting the above solution, since the feeding roller and the conveying roller group are not located on the same horizontal plane, the bag cannot be directly conveyed to the conveying roller group. The transfer component is used to change the transport direction of the bag. During the conveying process, the two transfer rollers guide the bag together. During the movement of the bag, the conveying part guides the bag in the direction of the conveying roller group, and the guiding part guides the bag to both sides, which has a stretching effect on the bag, thereby preventing the bag from wrinkling.

[0009] In one embodiment, the cutting assembly includes a first heat-sealing strip, a second heat-sealing strip, and a cutting blade located on the upper part of the first heat-sealing strip. The second heat-sealing strip is parallel to the first heat-sealing strip, and a first controllable telescopic member is provided on the side of the second heat-sealing strip away from the first heat-sealing strip. A guide rail is provided at the bottom of the cutting blade. When the cutting assembly is working, the first controllable telescopic member pushes the second heat-sealing strip, and the second heat-sealing strip abuts against the first heat-sealing strip. The cutting blade slides along the guide rail.

[0010] By adopting the above scheme, when the cutting component is working, the bag body is located at the discharge port. At this time, the first controllable telescopic component drives the second heat sealing strip to abut against the first heat sealing strip. The bag body is sandwiched between the first heat sealing strip and the second heat sealing strip. The first heat sealing strip and the second heat sealing strip heat up at the same time, thereby heat sealing the bag body. Finally, the cutting blade slides along the guide rail, thereby cutting off the bag body.

[0011] In one embodiment, the bag opening mechanism further includes two sliding beams arranged parallel to the conveying roller group and a support frame arranged perpendicular to the sliding beams. The sliding beams can slide along the length direction of the support frame. Each sliding beam carries one of the adsorption components. One end of the support frame is provided with a driving sprocket and the other end is provided with a driven sprocket. The driving sprocket and the driven sprocket are fitted with chains connected to the sliding beams. One sliding beam is fixed to the upper chain and the other sliding beam is fixed to the lower chain.

[0012] By adopting the above scheme, the active sprocket drives the chain and the driven sprocket to rotate. During the movement, the chain drives the two sliding beams to slide in opposite directions, and the sliding beams drive the adsorption components to move.

[0013] In one embodiment, each adsorption assembly includes two symmetrically arranged adsorption shells. Multiple adsorption holes are provided on the opposite surfaces of the two adsorption shells of different adsorption assemblies. A turbine fan is provided on the side of each adsorption shell away from the adsorption holes. The turbine fan includes an air intake end and a flow sensor is provided on the air intake end. When the flow sensor senses that the airflow in the adsorption shell reaches the threshold for the bag to be adsorbed, it controls the drive sprocket to rotate. The air intake end is in communication with the interior of the adsorption shell. Each adsorption shell includes a main shell and a secondary shell that is in communication with and rotatably connected to the main shell. The secondary shell is located on the side of the main shell away from the adjacent adsorption shell, and a second controllable telescopic member is provided between the main shell and the secondary shell.

[0014] By adopting the above scheme, when the turbine fan starts, it creates a negative pressure inside the adsorption shell. The adsorption holes adsorb the bag onto the surface of the adsorption shell. The second controllable telescopic component drives the sub-shell to rotate away from the bag, thereby stretching the bag and preventing wrinkles on the bag surface from affecting the adsorption effect of the adsorption shell.

[0015] In one embodiment, the bag opening mechanism further includes two parallel bag opening components. Each adsorption component has a bag opening component at its bottom. The bag opening mechanism includes a friction roller and a moving roller coaxially arranged with the friction roller. One of the adsorption components has a moving roller and a first driving member for driving the moving roller to rotate at its bottom, while the other adsorption component has a friction roller fixed at its bottom.

[0016] By adopting the above scheme, before the adsorption component adsorbs the bag, two bag opening components clamp the bag, the moving roller rotates while the friction roller does not rotate, creating a speed difference, which in turn creates opposite shearing forces on the surface of the bag, thus twisting the opening of the bag and quickly separating the opening of the bag, facilitating subsequent separation operations.

[0017] In one embodiment, the two bag-opening components are arranged symmetrically at the center. The adsorption housing located on the upper part of the friction roller is slidably connected to the sliding beam, and the adsorption housing located on the upper part of the moving roller is fixedly connected to the sliding beam. A drive block is provided at one end of the friction roller near the moving roller, and a drive screw passing through the drive block is provided on one side of the moving roller. A blower is also provided at the bottom of the turbine fan. An air outlet nozzle connected to the blower pipe is provided at the lower part of the friction roller. The air outlet nozzle is inclined upward and faces the moving roller of the other bag-opening component. A distance sensor is provided at the bottom of the first drive component. When the distance sensor senses the bag, it controls the blower located on the other adsorption component to start.

[0018] By adopting the above scheme, during the rotation of the moving roller, the drive screw on one side of the moving roller rotates together with the moving roller, thereby driving the drive block to move away from the moving roller, thereby causing the adsorption shell connected to the friction roller to move out of position. The two adsorption shells in the adsorption assembly are separated, which further stretches the bag body and prevents the bag body from wrinkling. When the moving roller rotates, it rubs against the surface of the bag body. The part of the bag body surface that is rubbed will protrude from the horizontal plane where the bag opening is located. The air nozzle blows the protruding part, thereby accelerating the opening of the bag body. At the same time, after the bag opening is opened, the air nozzle will generate an upward airflow to prevent the upper part of the bag body from adhering together due to static electricity or moisture.

[0019] In one embodiment, both the friction roller and the moving roller comprise multiple components arranged alternately. A gear ring fixed to the bottom of the adsorption housing is provided between the friction roller and the moving roller. Multiple planetary gears are arranged in a circumferential array within the gear ring. A sun gear that meshes with the planetary gears is located in the middle of the multiple planetary gears. The multiple planetary gears are connected by a planet carrier. The side of the planet carrier facing away from the planetary gears is fixed to the friction roller. A through hole is provided in the middle of the planet carrier. The first driving member is connected to a driving shaft. The shaft is fixed to the sun gear and passes through the through hole. A driven plate fixed to the shaft is provided inside the moving roller.

[0020] By adopting the above scheme, there is a planetary gear set structure between the friction roller and the moving roller. During the process of the first driving component driving the rotating shaft to rotate, the angular velocity of the moving roller is the same as that of the rotating shaft. The friction roller is decelerated by the planetary gear set, so its angular velocity is slower than that of the moving roller. A speed difference is formed between the moving roller and the friction roller, which has a friction effect on the surface of the bag, thus facilitating the unfolding of the bag. At the same time, both the moving roller and the friction roller can rotate in the same direction, generating a downward frictional force on the bag. Therefore, in addition to generating tangential force on the surface of the bag, the moving roller and the friction roller can also guide the bag downward, preventing the upward airflow generated by the air nozzle from obstructing the fall of the bag.

[0021] In one embodiment, the stretching assembly includes a sliding seat slidably connected to the sliding frame. The sliding seat is provided with a slide rail, a guide wheel, a second driving member that slides along the slide rail and drives the guide wheel to rotate, and a third controllable telescopic member that drives the second driving member to slide along the slide rail. The extended end of the sliding seat is also provided with a stretching plate. The stretching plate is provided with an abutment wheel. The abutment wheel and the guide wheel are located on the same plane. A guide plate is provided on one side of the second driving member. The guide plate is located on the side of the guide wheel away from the stretching plate. The third controllable telescopic member abuts against the guide plate. When the sliding frame slides to its highest point, the height of the air outlet nozzle is lower than that of the guide wheel.

[0022] By adopting the above scheme, during the descent of the bag, the edge of the bag opening falls between the guide wheel and the abutment wheel. The third controllable telescopic component drives the guide wheel away from the abutment wheel, avoiding the bag from failing to fall between the guide wheel and the abutment wheel due to the narrow space between them. When the sliding frame moves to the highest point, the height of the air nozzle is lower than that of the guide wheel, avoiding interference between the air nozzle and the falling trajectory of the bag. At the same time, before the bag has completely fallen between the guide wheel and the abutment wheel, the air nozzle can continuously deliver gas into the interior of the bag, unfolding the upper part of the bag and preventing the bag from falling off the surface of the adsorption shell during movement. The guide plate limits the bag and prevents the bag from being blown away by the air nozzle.

[0023] In one embodiment, the sliding frame has a first sprocket set in the middle and first drive sprockets at both ends. The first sprocket set is respectively fitted with chains that cooperate with the two first drive sprockets. The sliding seat is fixed to the chains. The sliding frame has a second sprocket set inside. The sliding frame has second drive sprockets on both sides. The second sprocket set is respectively fitted with chains that cooperate with the two second drive sprockets. The two ends of the sliding frame are fixed to the chains. The supporting column has a chain driven by a motor inside. The sliding frame is fixed to the chains.

[0024] By adopting the above scheme, the first drive sprocket drives the chain to move, so that the stretching component can move along the length direction of the sliding frame. When the second drive sprocket drives the chain to move, the sliding frame can move in a direction perpendicular to its own length. During the movement, the chain can drive the sliding frame to move up and down.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. When the film-wrapping device is working, the conveyor belt transports the material to the location of the support mechanism. Then, the conveyor rollers transport the bag on the feeding rollers, allowing the bag to pass through the top support plate. Two adsorption components adsorb the two sides of the bag respectively. The adsorption components move horizontally away from the bag to unfold the bag. The unfolded bag moves towards the location of the stretching components. Multiple stretching components clamp the opening edge of the bag. The stretching components move along the length of the sliding frame. The sliding frame drives the stretching components to slide along the horizontal direction perpendicular to the conveyor roller group. During this process, the opening of the bag is stretched by the film-wrapping mechanism into a shape that matches the projection of the material in the vertical direction. Finally, the sliding frame drives the film-wrapping mechanism to move downward along the length of the support column, thereby covering the surface of the material with the bag. Since the movement of the stretching components along the conveyor roller group and in the direction perpendicular to the conveyor roller group is independent, the film-wrapping mechanism can stretch the opening of the bag to a shape that matches the length and width of the material, avoiding a mismatch between the shape of the bag opening and the length and width of the material.

[0026] 2. Before the adsorption assembly adsorbs the bag, two bag-opening components clamp the bag. The moving roller rotates while the friction roller does not, creating a speed difference that generates opposing shear forces on the bag surface. This twists the bag opening, quickly separating the opening for subsequent separation. As the moving roller rotates, the drive screw on one side rotates with it, moving the drive block away from the moving roller. This displacement of the adsorption housing connected to the friction roller further stretches the bag, preventing wrinkles. Simultaneously, friction between the moving roller and the bag surface causes the rubbed portion to protrude above the opening. The air nozzle blows away this protrusion, accelerating the opening. After the opening opens, the air nozzle generates an upward airflow, preventing the upper parts of the bag from sticking together due to static electricity or moisture.

[0027] 3. The friction roller and the moving roller have a planetary gear set structure. During the rotation of the shaft driven by the first driving component, the angular velocity of the moving roller is the same as that of the shaft. The friction roller is decelerated by the planetary gear set, so its angular velocity is slower than that of the moving roller. A speed difference is formed between the moving roller and the friction roller, which creates a friction effect on the surface of the bag, thus facilitating the unfolding of the bag. At the same time, the airflow generated by the air nozzle can blow the bag into contact with the moving roller and the friction roller. Both the moving roller and the friction roller can rotate in the same direction, generating a downward frictional force on the bag. Therefore, in addition to generating tangential force on the surface of the bag, the moving roller and the friction roller can also guide the bag downward. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a film-covering device with bidirectional opening adjustment function provided in the first embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the material discharge mechanism according to the first embodiment of this application.

[0030] Figure 3 This is a cross-sectional view of the discharge mechanism according to the first embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the bag-opening mechanism according to the first embodiment of this application.

[0032] Figure 5 yes Figure 4 An enlarged view of region A.

[0033] Figure 6 This is a cross-sectional view of the adsorption component provided in the first embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the film-coating mechanism according to the first embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the structure of the stretching component according to the first embodiment of this application.

[0036] Figure 9 This is a schematic diagram of the adsorption component and the bag opening component according to the second embodiment of this application.

[0037] Figure 10 This is a cross-sectional view of the adsorption component and the bag opening component of the second embodiment of this application.

[0038] Figure 11 This is a schematic diagram of the structure of the stretching component according to the second embodiment of this application.

[0039] Figure 12 This is a schematic diagram of the adsorption component and the bag opening component according to the third embodiment of this application.

[0040] Figure 13 This is a cross-sectional view of the bag opening component according to the third embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Support mechanism; 11. Bearing column; 12. Sliding frame; 121. Second sprocket assembly; 122. Second drive sprocket; 13. Bearing top plate; 131. Discharge port; 14. Transfer assembly; 141. Transfer roller; 1411. Conveying section; 1412. Guide section; 2. Discharge mechanism; 21. Feeding roller; 22. Conveying roller assembly; 23. Cutting assembly; 231. First heat sealing strip; 23 2. Second heat-sealing strip; 233. Cutting blade; 234. First controllable telescopic component; 235. Guide rail; 3. Bag opening mechanism; 31. Adsorption assembly; 311. Adsorption housing; 3111. Adsorption hole; 3112. Main housing; 3113. Secondary housing; 3114. Second controllable telescopic component; 312. Turbine fan; 3121. Inhalation end; 3122. Flow sensor; 313. Blower; 32. Sliding mechanism 33. Beam; 331. Support frame; 332. Drive sprocket; 333. Driven sprocket; 34. Bag opening assembly; 341. Friction roller; 3411. Drive block; 342. Moving roller; 3421. Drive screw; 3422. Driven plate; 343. First drive component; 3431. Drive shaft; 3432. Distance sensor; 344. Air outlet nozzle; 345. Gear ring; 346. Planetary gear; 347. Sun gear; 348. Planetary carrier; 3481. Perforation; 4. Film covering mechanism; 41. Sliding frame; 411. First sprocket assembly; 412. First drive sprocket; 42. Tensioning assembly; 421. Sliding seat; 422. Slide rail; 423. Guide wheel; 424. Second drive component; 425. Third controllable telescopic component; 426. Tensioning plate; 4261. Abutment wheel; 427. Guide plate; 5. Conveying mechanism; 51. Conveyor belt. Detailed Implementation

[0042] Therefore, it is necessary to provide a film-covering device with bidirectional opening adjustment function that can adapt to materials of different sizes.

[0043] Example 1 Please see Figure 1 , Figure 1This is a schematic diagram of a film-covering device with bidirectional opening adjustment function provided in the first embodiment of this application. The film-covering device with bidirectional opening adjustment function provided in this embodiment includes a support mechanism 1, a material discharge mechanism 2, a bag opening mechanism 3, a film-covering mechanism 4, and a conveying mechanism 5. The support mechanism 1 provides a supporting foundation for the entire film-covering device; the material discharge mechanism 2 is used for winding, conveying, and cutting the bag body; the bag opening mechanism 3 unfolds the bag opening; the film-covering mechanism 4 opens the bag opening and covers the material; and the conveying mechanism 5 is responsible for conveying the material. These mechanisms cooperate to realize the film-covering operation of the bag body, solving the problem that existing film-covering devices cannot flexibly adjust the length and width of the bag opening to adapt to the material, thus improving the quality and efficiency of film-covering. Compared with the prior art, this application can adapt to various rectangular materials with aspect ratios from 1:3 to 2:1, greatly expanding its applicability. At the same time, because the bag opening is highly matched to the material shape, the wrinkle rate after film-covering is reduced by more than 50%.

[0044] The support mechanism 1 includes multiple parallel supporting columns 11, a sliding frame 12 that moves along the length of the supporting columns 11, and a supporting top plate 13 fixed to the top of the supporting columns 11. The supporting columns 11 are generally made of metal, such as stainless steel or aluminum alloy, possessing high strength and stability, and are typically square or circular cylindrical in shape. The sliding frame 12 is connected to the supporting columns 11 via guide rails or sliders to achieve smooth sliding. For example, linear guide rails can be used, which have a low coefficient of friction, ensuring smooth movement of the sliding frame 12 on the supporting columns 11. The supporting top plate 13 is fixed to the top of the supporting columns 11 and serves to support the discharge mechanism 2. It can be a flat plate or designed as a plate with a certain reinforcing structure according to actual needs. In this application, a chain is installed inside the supporting columns 11, and mounting blocks fixed to the chain are provided on both sides of the sliding frame 12. The chain is driven by a motor-driven sprocket.

[0045] Please refer to the following: Figure 2-3 , Figure 2This is a schematic diagram of the discharging mechanism according to the first embodiment of this application. The discharging mechanism 2 includes a feeding roller 21, a conveying roller group 22, and a cutting assembly 23. The feeding roller 21 is located on one side of the support mechanism 1 and is used to roll up the bag. The common feeding roller 21 is cylindrical and has a smooth surface to reduce friction with the bag. The conveying roller group 22 and the cutting assembly 23 are both supported on the supporting top plate 13, and the supporting top plate 13 is provided with a discharge port 131. The conveying roller group 22 consists of multiple conveying roller groups 22. These conveying rollers are parallel to each other and can rotate synchronously under the drive of a motor to realize the conveying of the bag. The surface of the conveying rollers can be covered with materials such as rubber to increase the friction between the conveying rollers and the bag, ensuring that the bag can be conveyed stably. The conveying roller group 22 can be equipped with a rotary encoder to control the conveying distance of the bag, so that the cutting assembly 23 can cut the bag into a suitable length. It includes a first heat sealing strip 231, a second heat sealing strip 232, and a cutting blade 233 located on one side of the opening of the discharge port 131. The first heat-sealing strip 231 and the second heat-sealing strip 232 are arranged in parallel. When the bag needs to be cut, the second heat-sealing strip 232, pushed by the first controllable telescopic component 234, abuts against the first heat-sealing strip 231, thereby sealing the top of the bag. The first controllable telescopic component 234 is a small cylinder, whose air circuit is connected to an external air source through a solenoid valve. When the cutting command is issued, the controller controls the solenoid valve to switch, and the cylinder piston rod extends, thereby providing a stable and rapid thrust to push the second heat-sealing strip 232 to abut against the first heat-sealing strip 231 tightly, ensuring the heat-sealing quality. This solution has a fast response speed and a simple structure. Then, the cutting blade 233 slides along the guide rail 235 to cut the bag. The first controllable telescopic component 234 can be a cylinder or an electric push rod, etc., capable of providing a stable thrust.

[0046] At least one transfer assembly 14 is provided on the side of the conveyor roller group 22 facing the feed roller 21. The transfer assembly 14 includes two parallel transfer rollers 141. Each transfer roller 141 includes a conveying part 1411 and a guiding part 1412. The guiding part 1412 is parallel to the conveyor roller group 22 and located on both sides of the conveying part 1411, inclined away from the direction of bag movement. When the conveyor roller group 22 conveys the bag, the bag is located between the two transfer rollers 141. The conveying part 1411 of the transfer roller 141 can be a smooth cylindrical surface, and the guiding part 1412 can be a conical surface. The inclination angle is designed according to actual needs. Since the feed roller 21 and the conveyor roller group 22 are not located on the same horizontal plane, the bag cannot be directly conveyed to the conveyor roller group 22. The transfer assembly 14 is used to change the transport direction of the bag. During the bag conveying process, the two transfer rollers 141 work together to guide the bag. The conveying part 1411 guides the bag in the direction of the conveying roller group 22, and the guiding part 1412 guides the bag to both sides, which stretches the bag and prevents it from wrinkling.

[0047] Please refer to the following: Figure 4-6 , Figure 4 This is a schematic diagram of the bag opening mechanism according to the first embodiment of this application. The bag opening mechanism 3 is located on the side of the supporting top plate 13 away from the conveying roller group 22, and includes at least two adsorption components 31. The adsorption components 31 can move in a horizontal direction perpendicular to the conveying roller group 22. Each adsorption component 31 includes two symmetrically arranged adsorption shells 311. Multiple adsorption holes 3111 are provided on the opposite surfaces of the two adsorption shells 311 of different adsorption components 31. A turbine fan 312 is provided on the side of each adsorption shell 311 away from the adsorption holes 3111. The turbine fan 312 includes an air intake end 3121, and the air intake end 3121 is equipped with a flow sensor 3122. When the flow sensor 3122 senses that the airflow in the adsorption shell 311 has reached the threshold for the bag to be adsorbed, it can control the drive sprocket 331 to rotate. The air intake end 3121 of the turbine fan 312 is connected to the adsorption shell 311. When the turbine fan 312 is started, a negative pressure is formed in the adsorption shell 311, and the adsorption holes 3111 adsorb the bag onto the surface of the adsorption shell 311. The adsorption housing 311 includes a main housing 3112 and a secondary housing 3113 rotatably connected to the main housing 3112. The secondary housing 3113 is located on the side of the main housing 3112 opposite to the adjacent adsorption housing 311. The secondary housing 3113 and the main housing 3112 are connected by a flexible hose. A second controllable telescopic member 3114 is provided between the main housing 3112 and the secondary housing 3113. The second controllable telescopic member 3114 can be a small cylinder or an electric telescopic rod. When it extends or retracts, it drives the secondary housing 3113 to rotate, which stretches the bag and prevents the bag from wrinkling.

[0048] Please refer to the following: Figure 7-8 , Figure 7This is a schematic diagram of the film-covering mechanism according to the first embodiment of this application. The film-covering mechanism 4 includes multiple stretching components 42 and at least two sliding frames 41. Each sliding frame 41 is provided with at least one stretching component 42. The stretching component 42 can move along the length direction of the sliding frame 41. The sliding frame 41 is supported by the sliding frame 12. Each sliding frame 41 can move along the horizontal direction of the vertical conveying roller group 22. The stretching component 42 can clamp the opening edge of the bag body. The stretching component 42 includes a sliding seat 421 slidably connected to the sliding frame 41. The sliding seat 421 is provided with a slide rail 422, a guide wheel 423, and a second driving member 424 for driving the guide wheel 423 to rotate. The second driving member 424 is a motor. The second driving member 424 slides along the slide rail 422 through a third controllable telescopic member 425. The third controllable telescopic member 425 is an electromagnetic push rod. Its fixed end is connected to the sliding seat 421, and its movable end abuts against the guide plate 427. When energized, the electromagnetic push rod extends, pushing the second driving component 424 to move along the slide rail 422. This design is simple in structure, has a fast response, and is suitable for two-point clamping / releasing control. The sliding seat 421 has a vertically arranged tension plate 426 at its end, with an abutment wheel 4261 inside the tension plate 426, which is located on the same plane as the guide wheel 423.

[0049] During the descent of the bag, the edge of the bag opening falls between the guide wheel 423 and the abutment wheel 4261. The third controllable telescopic component 425 drives the guide wheel 423 away from the abutment wheel 4261, thus preventing the bag from falling between the guide wheel 423 and the abutment wheel 4261 due to the narrow space between them.

[0050] The sliding frame 41 has a first sprocket group 411 in the middle and first drive sprockets 412 driven by a motor at both ends. The first drive sprocket group 412 includes two sprockets coaxially arranged. The first drive sprockets 412 drive the sliding seat 421 to move through the first sprocket group 411 via a chain. The sliding frame 12 has a second sprocket group 121 inside and second drive sprockets 122 driven by a motor on both sides. The two second drive sprockets 122 drive the sliding frame 41 to move through the two sprockets of the second sprocket group 121 via chains. The first drive sprockets 412 drive the chain to move, so that the stretching component 42 can move along the length of the sliding frame 41. When the second drive sprockets 122 drive the chain to move, the sliding frame 41 can move in a direction perpendicular to its own length. The distance that the stretching component 42 moves in both directions is adjustable. The opening of the bag can be opened by the film covering mechanism 4 to fit the shape of the material's projection in the vertical direction, avoiding a mismatch between the shape of the bag opening and the length and width of the material.

[0051] The conveying mechanism 5 is located below the film-coating mechanism 4 and includes a conveyor belt 51 for conveying materials. The conveyor belt 51 is typically made of rubber or plastic with a certain surface roughness to increase friction with the materials and ensure stable material transport. The conveyor belt 51 is driven by a motor, which transmits power to the rollers of the conveyor belt 51 through a reducer or similar device, causing the conveyor belt 51 to rotate cyclically. Alternatively, the conveyor belt 51 can be driven by a chain and sprockets. The conveyor belt 51 is composed of multiple metal tubing fixed to the chain, thereby increasing the load-bearing capacity of the conveyor belt 51.

[0052] The working principle of this embodiment is as follows: When the film-making device is working, the conveyor belt 51 transports the material to the location of the support mechanism 1. Then, the conveyor roller transports the bag body on the feeding roller 21, so that the bag body passes through the bearing top plate 13. The two adsorption components 31 adsorb the two sides of the bag body respectively. The adsorption components 31 move in a horizontal direction away from the bag body to unfold the bag body. The unfolded bag body moves to the location of the stretching component 42. Multiple stretching components 42 clamp the opening edge of the bag body. The stretching components 42 move along the length direction of the sliding frame 41. The sliding frame 41 drives the stretching components 42 to move along a direction perpendicular to the length of the sliding frame 41. As the conveyor roller group 22 slides horizontally, the opening of the bag is stretched by the film-covering mechanism 4 into a shape that matches the projection of the material in the vertical direction. Finally, the sliding frame 12 drives the film-covering mechanism 4 to move downward along the length of the supporting column 11, thereby covering the surface of the material with the bag. Since the stretching component 42 moves independently along the direction of the conveyor roller group 22 and in the direction perpendicular to the conveyor roller group 22, the film-covering mechanism 4 can stretch the opening of the bag to a shape that matches the length and width of the material, thus avoiding a mismatch between the shape of the bag opening and the length and width of the material.

[0053] Example 2 Please refer to the following: Figure 9-10 , Figure 9 This is a schematic diagram of the adsorption assembly and bag opening assembly of the second embodiment of this application. The structure of this embodiment is basically the same as the above embodiments, except that the bag opening mechanism 3 further includes two bag opening assemblies 34, which are arranged symmetrically at the center. Each adsorption assembly 31 has one bag opening assembly 34 at its bottom. Each bag opening assembly 34 includes a friction roller 341 and a moving roller 342. The surfaces of the friction roller 341 and the moving roller 342 are made of rubber, thereby ensuring that the friction roller 341 and the moving roller 342 have sufficient friction. One of the adsorption housings 311 of the adsorption assembly 31 has a moving roller 342 at its bottom, connected to a first driving member 343 that drives its rotation. The friction roller 341 is fixed to the bottom of the other adsorption housing 311.

[0054] The first driving component 343 can be a motor, which drives the rotating roller 342 to rotate, creating a speed difference with the stationary friction roller 341. This generates opposing shear forces on the bag surface, twisting the bag opening and facilitating its separation. A driving block 3411 is located at one end of the friction roller 341 near the rotating roller 342. A driving screw 3421 connected to the driving block 3411 passes through one side of the rotating roller 342. A blower 313 is located at the bottom of the turbine blower 312. The blower 313 is connected to an upwardly angled air nozzle 344 via a pipe, with the nozzle facing the rotating roller 342 of another bag opening assembly 34. The pipe connected to the air nozzle 344 can be a metal pipe, ensuring a constant airflow direction. A distance sensor 3432 is located at the bottom of the first driving component 343. When the distance sensor 3432 detects a bag, it controls the blower 313 located in the other adsorption assembly to start.

[0055] The adsorption housing 311 connected to the moving roller 342 is fixed to the sliding beam 32, and the adsorption housing 311 connected to the friction roller 341 is slidably connected to the sliding beam 32. During the rotation of the moving roller 342, the drive screw 3421 on one side of the moving roller 342 rotates with the moving roller 342, thereby driving the drive block 3411 to move away from the moving roller 342, thus causing the adsorption housing 311 connected to the friction roller 341 to shift. The two adsorption housings 311 in the adsorption assembly 31 are separated, further stretching the bag and preventing wrinkles. Before the adsorption housing 311 adsorbs the bag, the horizontal height of the bag opening is flush with the horizontal height of the axis of the moving roller 342. In this embodiment, when the sliding frame 12 slides to its highest point, the height of the air outlet nozzle 344 is lower than the guide wheel 423.

[0056] Please refer to the following: Figure 11 , Figure 11 This is a schematic diagram of the stretching assembly according to the second embodiment of this application. A guide plate 427 is provided on one side of the sliding seat 421. The guide plate 427 is located on the side of the guide wheel 423 away from the stretching plate 426. The guide plate 427 can be bent so that the guide portion 1412 of the guide plate 427 is coplanar with the axis of the guide wheel 423. When the bag falls, the edge of the bag opening falls between the guide wheel 423 and the abutment wheel 4261. The third controllable telescopic member 425 pushes the second driving member 424 to slide along the slide rail 422, causing the guide wheel 423 to move closer to or further away from the abutment wheel 4261, thereby clamping the bag.

[0057] The working principle of this embodiment is as follows: During the rotation of the moving roller 342, friction occurs between it and the surface of the bag. The part of the bag surface that is rubbed protrudes from the bag opening. The air nozzle 344 blows on the protruding part, thereby accelerating the opening of the bag. After the bag opening opens, the air nozzle 344 generates an upward airflow to prevent the upper part of the bag from sticking together due to static electricity or moisture. When the sliding frame 12 moves to the highest point, the height of the air nozzle 344 is lower than that of the guide wheel 423, avoiding interference between the air nozzle 344 and the falling trajectory of the bag. Before the bag body has completely fallen between the guide wheel 423 and the abutment wheel 4261, the exhaust nozzle 344 can continuously deliver gas into the interior of the bag body, unfolding the upper part of the bag body and preventing the bag body from falling off the surface of the adsorption shell 311 during movement. The guide plate 427 plays a limiting role for the bag body, preventing the bag body from being blown away by the exhaust nozzle 344. When the bag body has finished falling, under the drive of the first drive member 343 and the second drive member 424, the sliding seat 421 moves outward, and the stretching plate 426 applies a pulling force to the bag body, thereby expanding the bag body into a shape that fits the material.

[0058] Example 3 Please see Figure 12-13 , Figure 11 This is a schematic diagram of the adsorption assembly and bag opening assembly according to the third embodiment of this application. The structure of this embodiment is basically the same as the above embodiments, except that: multiple friction rollers 341 and moving rollers 342 are included and arranged alternately. A planetary gear set is provided between the friction rollers 341 and the moving rollers 342. The planetary gear set includes a gear ring 345 fixed to the bottom of the adsorption housing 311, planetary gears 346 and a sun gear 347 arranged in a circumferential array and cooperating with the inner wall of the gear ring 345. The planetary gears 346 are connected by a planet carrier 348. The side of the planet carrier 348 facing away from the planetary gears 346 is fixed to the friction roller 341. The sun gear 347 is fixed to a drive shaft 3431 connected to the first drive member 343. The first drive member 343 is a motor. A driven plate 3422 fixed to the shaft is provided inside the moving roller 342. The planetary carrier 348 has a through hole 3481 in the middle. The first driving member 343 is provided with a driving shaft 3431, which passes through the through hole 3481. A driven plate 3422 is provided inside the moving roller 342. The shaft passes through the sun gear 347 and the driven plate 3422 and is fixed to the sun gear 347 and the driven plate 3422. The shaft can also be connected by a key to realize the transmission of the sun gear 347 and the driven plate 3422. In this application, the friction roller 341 and the moving roller 342 are both in even numbers. When the two bag opening components 34 are working, the friction roller 341 in one bag opening component 34 is directly opposite the moving roller 342 in the other bag opening component 34. The setting of the air nozzle 344 is the same as that in Embodiment 1 of this application.

[0059] In this application, the top of the gear ring 345 may be provided with an adsorption hole 3111 communicating with the adsorption housing 311. Both the outer circumferential surfaces of the friction roller 341 and the moving roller 342 are provided with through holes, thereby enabling both the friction roller 341 and the moving roller 342 to possess adsorption capacity, enhancing their guiding ability on the bag. During the rotation of the shaft driven by the first driving member 343, the angular velocity of the moving roller 342 is the same as the angular velocity of the shaft. The friction roller 341 is decelerated by a planetary gear set, therefore... Its angular velocity is slower than that of the moving roller 342. A speed difference is formed between the moving roller 342 and the friction roller 341, which creates a friction effect on the surface of the bag, thus facilitating the unfolding of the bag. At the same time, both the moving roller 342 and the friction roller 341 can rotate in the same direction, generating a downward frictional force on the bag. Therefore, in addition to generating tangential force on the surface of the bag, the moving roller 342 and the friction roller 341 can also guide the bag downward, preventing the upward airflow generated by the air nozzle 344 from obstructing the fall of the bag.

[0060] The working principle of this embodiment is as follows: There is a planetary gear set structure between the friction roller 341 and the moving roller 342. During the process of the first driving member 343 driving the rotating shaft to rotate, the angular velocity of the moving roller 342 is the same as that of the rotating shaft. The friction roller 341 is decelerated by the planetary gear set, so its angular velocity is slower than that of the moving roller 342. A speed difference is formed between the moving roller 342 and the friction roller 341, which has a friction effect on the surface of the bag, thus facilitating the unfolding of the bag. At the same time, the airflow generated by the air nozzle 344 can blow the bag to contact the moving roller 342 and the friction roller 341. The moving roller 342 and the friction roller can both rotate in the same direction, generating a downward friction force on the bag. Therefore, in addition to generating tangential force on the surface of the bag, the moving roller 342 and the friction roller can also guide the bag downward.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A film-covering device with bidirectional opening adjustment function, characterized in that, include: The support mechanism (1) includes a support column (11), a sliding frame (12) that moves along the length of the support column (11), and a support top plate (13) fixed to the top of the support column (11). The support top plate (13) is provided with a discharge port (131) through which the bag body passes. The discharge mechanism (2) includes a feeding roller (21) for winding the bag body, a conveying roller group (22) for conveying the bag body, and a cutting component (23) for cutting the bag body. The feeding roller (21) is located on one side of the support mechanism (1), and the conveying roller group (22) and the cutting component (23) are both supported on the supporting top plate (13). The bag opening mechanism (3) is located on the side of the bearing top plate (13) away from the conveying roller group (22). The bag opening mechanism (3) includes two adsorption components (31) parallel to the conveying roller group (22). The adsorption components (31) can move in a horizontal direction perpendicular to the conveying roller group (22). The film-making mechanism (4) includes four stretching components (42) and two sliding frames (41) parallel to the conveying roller group (22). Each sliding frame (41) is provided with two stretching components (42). The stretching components (42) can move along the length direction of the sliding frame (41). The sliding frame (41) is supported by the sliding frame (12). Each sliding frame (41) can move in a horizontal direction perpendicular to the conveying roller group (22). Each stretching component (42) can clamp the opening edge of the bag body. The conveying mechanism (5) includes a conveyor belt (51) for conveying materials, the conveyor belt (51) being located below the film-coating mechanism (4).

2. The film-shrouding device with bidirectional opening adjustment function according to claim 1, characterized in that: The conveying roller group (22) has multiple transfer components (14) on the side facing the feeding roller (21). Each transfer component (14) includes two parallel transfer rollers (141). Each transfer roller (141) includes a conveying part (1411) and a guiding part (1412). The guiding part (1412) is parallel to the conveying roller group (22) and is located on both sides of the conveying part (1411) and is inclined away from the direction of movement of the bag. When the conveying roller group (22) conveys the bag, the bag is located between the two transfer rollers (141).

3. A film-sheltering device with bidirectional opening adjustment function according to claim 1, characterized in that: The cutting assembly (23) includes a first heat-sealing strip (231), a second heat-sealing strip (232), and a cutting blade (233) located on the opening side of the discharge port (131). The second heat-sealing strip (232) is parallel to the first heat-sealing strip (231), and a first controllable telescopic member (234) is provided on the side of the second heat-sealing strip (232) away from the first heat-sealing strip (231). A guide rail (235) is provided at the bottom of the cutting blade (233). When the cutting assembly (23) is working, the first controllable telescopic member (234) pushes the second heat-sealing strip (232), and the second heat-sealing strip (232) abuts against the first heat-sealing strip (231). The cutting blade (233) slides along the guide rail (235).

4. A film-sheltering device with bidirectional opening adjustment function according to claim 3, characterized in that: The bag opening mechanism (3) also includes two sliding beams (32) arranged parallel to the conveying roller group (22) and a support frame (33) arranged perpendicular to the sliding beams (32). The sliding beams (32) can slide along the length direction of the support frame (33). Each sliding beam (32) carries an adsorption component (31). One end of the support frame (33) is provided with a drive sprocket (331) and the other end is provided with a driven sprocket (332). The drive sprocket (331) and the driven sprocket (332) are fitted with chains connected to the sliding beams (32). One sliding beam (32) is fixed to the chain located at the upper part, and the other sliding beam (32) is fixed to the chain located at the lower part.

5. A film-sheltering device with bidirectional opening adjustment function according to claim 4, characterized in that: Each of the adsorption components includes two symmetrically arranged adsorption housings (311). Multiple adsorption holes (3111) are provided on the opposite faces of the two adsorption housings (3111) located in different adsorption components (31). A turbine fan (312) is provided on the side of each adsorption housing (3111) away from the adsorption holes (3111). The turbine fan (312) includes an air intake end (3121) and the air intake end (3121) is equipped with a flow sensor (3122). The flow sensor (3122) senses the airflow within the adsorption housing (311) reaching the bag. When the adsorption threshold is reached, the active sprocket (331) is controlled to rotate. The suction end (3121) is connected to the interior of the adsorption shell (311). Each adsorption shell (311) includes a main shell (3112) and a secondary shell (3113) connected to and rotatably connected to the main shell (3112). The secondary shell (3113) is located on the side of the main shell (3112) away from the adjacent adsorption shell (311), and a second controllable telescopic member (3114) is provided between the main shell (3112) and the secondary shell (3113).

6. A film-sheltering device with bidirectional opening adjustment function according to claim 5, characterized in that: The bag opening mechanism (3) further includes two parallel bag opening components (34). Each adsorption component (31) has a bag opening component (34) at its bottom. The bag opening mechanism (3) includes a friction roller (341) and a moving roller (342) coaxially arranged with the friction roller (341). The bottom of one of the adsorption components (311) is provided with the moving roller (342) and a first driving member (343) that drives the moving roller (342) to rotate. The bottom of the other adsorption component (311) is fixed with the friction roller (341).

7. A film-sheltering device with bidirectional opening adjustment function according to claim 6, characterized in that: The two bag-opening assemblies (34) are arranged symmetrically at the center. The adsorption shell (311) located on the upper part of the friction roller (341) is slidably connected to the sliding beam (32), and the adsorption shell (311) located on the upper part of the moving roller (342) is fixedly connected to the sliding beam (32). A drive block (3411) is provided at one end of the friction roller (341) near the moving roller (342), and a drive screw (3421) passing through the drive block (3411) is provided on one side of the moving roller (342). The turbine The bottom of the blower (312) is also provided with a blower (313). The lower part of the friction roller (341) is provided with an air outlet nozzle (344) that is connected to the pipe of the blower (313). The air outlet nozzle (344) is inclined upward and faces the moving roller (342) of the other bag opening assembly (34). The bottom of the first drive member (343) is provided with a distance sensor (3432). When the distance sensor (3432) senses the bag, it controls the blower (313) located in the other adsorption assembly (31) to start.

8. A film-sheltering device with bidirectional opening adjustment function according to claim 7, characterized in that: Both the friction roller (341) and the moving roller (342) include multiple components arranged alternately. A gear ring (345) fixed to the bottom of the adsorption housing (311) is provided between the friction roller (341) and the moving roller (342). Multiple planetary gears (346) are arranged in a circumferential array inside the gear ring (345). A sun gear (347) that mates with the planetary gears (346) is provided in the middle of the multiple planetary gears (346). The multiple planetary gears (346) are composed of... A planetary carrier (348) is connected, and the side of the planetary carrier (348) away from the planetary gear (346) is fixed to the friction roller (341). A through hole (3481) is provided in the middle of the planetary carrier (348). The first driving member (343) is connected to the driving shaft (3431). The shaft is fixed to the sun gear (347) and passes through the through hole (3481). A driven plate (3422) fixed to the shaft is provided inside the moving roller (342).

9. A film-sheltering device with bidirectional opening adjustment function according to claim 7, characterized in that: The tensioning assembly (42) includes a sliding seat (421) slidably connected to the sliding frame (41). The sliding seat (421) is provided with a slide rail (422), a guide wheel (423), a second driving member (424) that slides along the slide rail (422) and drives the guide wheel (423) to rotate, and a third controllable telescopic member (425) that drives the second driving member (424) to slide along the slide rail (422). The extended end of (421) is also provided with a tension plate (426), and the tension plate (426) is provided with an abutment wheel (4261). The abutment wheel (4261) and the guide wheel (423) are located on the same plane. The second drive member (424) is provided with a guide plate (427) on one side. The guide plate (427) is located on the side of the guide wheel (423) away from the tension plate (426). The third controllable telescopic member (425) abuts against the guide plate (427).

10. A film-sheltering device with bidirectional opening adjustment function according to claim 9, characterized in that: The sliding frame (41) has a first sprocket set (411) in the middle and first drive sprockets (412) at both ends. The first sprocket set (411) is fitted with chains that cooperate with the two first drive sprockets (412). The sliding seat (421) is fixed to the chain. The sliding frame (12) has a second sprocket set (121) inside. The sliding frame (12) has second drive sprockets (122) on both sides. The second sprocket set (121) is fitted with chains of the two second drive sprockets (122). The sliding frame (41) is fixed to the chain at both ends. The supporting column (11) has a chain driven by a motor inside. The sliding frame (12) is fixed to the chain.

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