A film winding device for packing a logistics carton

Abstract

This invention discloses a film wrapping device for packaging cartons in logistics, relating to the field of carton packaging technology. It comprises a base and a top plate, fixedly connected by a support column; an electric rotating chassis, rotatably mounted on the support surface of the base; and a telescopic cylinder, fixed vertically to the lower end of the top plate and coaxially arranged with the electric rotating chassis. An installation plate is fixedly mounted on the telescopic end of the cylinder, and a horizontally rotatable limiting plate is configured at the lower end of the installation plate. A carton is placed between the limiting plate and the electric rotating chassis, and a limiting groove matching the bottom of the carton is formed on the support surface of the electric rotating chassis. The invention features a unique L-shaped plate structure that integrates the "air bubble removal" function of the pressure head end with the "film spreading" function of the arc-shaped convex end, simultaneously completing compaction and leveling during the wrapping process. This significantly improves the flatness and tightness of the film wrapping, reducing air bubbles and wrinkles.

Description

Technical Field

[0001] This invention relates to the field of cardboard box packaging technology, specifically to a film wrapping device for packaging cardboard boxes for logistics. Background Technology

[0002] In the modern logistics and warehousing industry, film wrapping is a key process for protecting cardboard boxed goods, achieving stable containerization, and preventing dust and moisture.

[0003] Traditional film wrapping relies primarily on manual operation or simple semi-automatic wrapping machines. Manual wrapping is inefficient, labor-intensive, and produces inconsistent wrapping quality, with varying film tightness, air bubbles, and wrinkles, affecting both packaging appearance and protective effect. Most wrapping machines simply press the film onto the carton surface using pressure rollers or guide rollers, lacking an effective mechanism for expelling air between the film and the carton sidewalls. This results in air bubbles inside the wrapped packaging, reducing the film's tightness and overall puncture resistance. Furthermore, insufficient handling of the film's own stretching makes it prone to wrinkles when wrapping uneven boxes or corners, affecting both packaging aesthetics and sealing.

[0004] Therefore, this application proposes a film wrapping device for packaging cartons in logistics. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a film wrapping device for packaging cartons in logistics.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A film wrapping device for packaging cardboard boxes in logistics includes: The base and the top plate are fixedly connected by support columns; An electrically rotating chassis is mounted on the support surface of the base and rotates vertically in the direction of rotation. A telescopic cylinder is fixed vertically to the lower end of the top plate and coaxially with the electric rotating chassis. An installation plate is fixedly installed at its telescopic end. A horizontally rotatable limiting plate is configured at the lower end of the installation plate. A cardboard box is placed between the limiting plate and the electric rotating chassis. A limiting groove matching the bottom of the cardboard box is opened on the support surface of the electric rotating chassis. The connecting arm is set on the side wall of the mounting plate along the rotation radius of the carton; The L-shaped plate slides along the length of the connecting arm on the lower end face of the connecting arm and is in contact with the periphery of the carton. Its height is less than the distance between the limiting plate and the electric rotating chassis. The L-shaped plate includes: The pressure head end slides against the side wall of the carton to squeeze out air bubbles between the film and the side wall of the carton; The curved convex end forms a gap between itself and the side wall of the carton to allow the film to stretch. The crankshaft slides along the length of the connecting arm at its upper end and is rotatably mounted on the L-shaped plate at its lower end. The pressure head end and the arc-shaped protrusion end swing axially around the crankshaft as a fulcrum.

[0007] Preferably, the connecting arm has a groove along its length that matches the upper end of the crankshaft. The crankshaft slides along the length of the groove. An elastic element is provided in the groove along its length. One end of the elastic element is fixed to the crankshaft, and the other end is fixedly installed at the end of the groove away from the carton.

[0008] Preferably, it also includes a film roller, which is rotatably mounted on the upper end face of the base, and a film is wound on its surface for feeding the film.

[0009] Preferably, the side of the pressure head facing the carton is provided with a flexible contact layer, and the radius of curvature of the arc-shaped protrusion is adjustable.

[0010] Preferably, the horizontally rotatable limiting plate configured at the lower end of the mounting plate is a pneumatic suction cup or an electromagnetic suction cup.

[0011] Preferably, the elastic element is a compression spring or a nitrogen spring with adjustable preload, and the side wall of the slide is provided with an observation window.

[0012] Preferably, it also includes a film tension controller, which is installed on the film exit path of the film roller to detect and adjust the unwinding tension of the film in real time.

[0013] Preferably, the connecting arm is a telescopic structure, including a fixed section and a movable section driven by a linear drive mechanism.

[0014] Preferably, a pressure sensor is provided on the support surface of the electric rotating chassis, and the pressure sensor, the telescopic cylinder, and the electric rotating chassis are all electrically connected to a controller.

[0015] Preferably, a torsion spring is also provided at the rotatable connection between the crankshaft and the L-shaped plate. In the initial state, the pressure head end abuts against the side wall of the carton, forming a gap between them for stretching the film wrinkles. When the film passes through the stretching gap, it will be squeezed in the opposite direction, and at this time it will swing and squeeze the film on the periphery.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The unique L-shaped plate structure integrates the "air bubble removal" function of the pressure head end with the "film stretching" function of the arc-shaped convex head end, and simultaneously completes compaction and leveling during the winding process, which significantly improves the flatness and tightness of the film wrapping and reduces air bubbles and wrinkles.

[0017] 2. The sliding and swing connection design of the crankshaft gives the L-shaped plate a certain floating and self-adaptive ability, which can effectively cope with different sizes of cartons, changes in film tension, or slight unevenness of the carton surface, thus improving the applicability of the device and the stability of the winding quality.

[0018] 3. A torsion spring is also provided at the rotating connection between the crankshaft and the L-shaped plate. In the initial state, the pressure head end abuts against the side wall of the carton, and a gap is formed between the arc-shaped convex end and the carton to stretch the film wrinkles. When the film passes through the stretching gap, it will squeeze the arc-shaped convex end in the direction away from the carton. According to the lever principle, at this time the pressure head end will swing towards the carton, squeezing the film on the periphery of the carton, so that the film and the carton are more tightly bonded. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 A schematic diagram of the front structure of a film wrapping device for packaging cardboard boxes in logistics; Figure 2 A schematic diagram of the back structure of a film wrapping device for packaging cardboard boxes in logistics; Figure 3 A rear view of a film wrapping device for packaging cardboard boxes in logistics. Figure 4 A front view of a film wrapping device for packaging cartons in logistics; Figure 5 A top cross-sectional view of a film wrapping device for packaging cardboard boxes in logistics; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the structure of an L-shaped plate in a film wrapping device for packaging cartons in logistics. Figure 8 This is a schematic diagram of the crankshaft in a film wrapping device for packaging cartons in logistics. Figure 9 This is a top sectional view of the connecting arm in a film wrapping device for packaging cartons in logistics.

[0020] The following are the labels in the diagram: 1. Base; 2. Film roller; 3. Top plate; 4. Telescopic cylinder; 5. Mounting plate; 6. Carton; 7. Electric rotating chassis; 8. Connecting arm; 9. Crankshaft; 10. L-shaped plate; 101. Press head end; 102. Arc-shaped convex head end; 801. Slide groove; 803. Elastic element. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention. Example

[0022] like Figures 1-9 As shown, a film wrapping device for packaging cartons in logistics includes: a base 1 and a top plate 3, which are fixedly connected by a support column; an electric rotating chassis 7, which is rotatably mounted on the support surface of the base 1 in a vertical direction; a telescopic cylinder 4, which is fixedly mounted on the lower end face of the top plate 3 in a vertical direction and is coaxially arranged with the electric rotating chassis 7, and a mounting plate 5 is fixedly installed on its telescopic end; a horizontally rotatable limiting plate is arranged at the lower end of the mounting plate 5; a carton 6 is placed between the limiting plate and the electric rotating chassis 7; a limiting groove matching the bottom of the carton 6 is opened on the support surface of the electric rotating chassis 7; a connecting arm 8, which is arranged on the side wall of the mounting plate 5 along the rotation radius direction of the carton 6; and an L-shaped plate 10, which slides along the length direction of the connecting arm 8 on the lower end face of the connecting arm 8 and is attached to the periphery of the carton 6, and its height is less than the distance between the limiting plate and the electric rotating chassis 7. The L-shaped plate 10 includes: a pressure head end 101, which slides against the side wall of the carton 6 to expel air bubbles between the film and the side wall of the carton 6; an arc-shaped protrusion end 102, which forms a gap with the side wall of the carton 6 to stretch the film; and a crankshaft 9, the upper end of which slides along the length of the connecting arm 8, and the lower end of which is rotatably mounted on the L-shaped plate 10, wherein the pressure head end 101 and the arc-shaped protrusion end 102 swing axially around the crankshaft 9 as a fulcrum.

[0023] Specifically, the film wrapping device mainly includes a base 1, a top plate 3, an electric rotating chassis 7, a telescopic cylinder 4, a mounting plate 5, a connecting arm 8, and an L-shaped plate 10. The base 1 and the top plate 3 are fixedly connected by a support column to form the main frame. The electric rotating chassis 7 is rotatably mounted on the support surface of the base 1 to support and drive the carton 6 to rotate. The telescopic cylinder 4 is vertically fixed below the top plate 3, and the mounting plate 5 is installed at the end of its piston rod. The lower end of the mounting plate 5 is provided with a horizontally rotatable limiting plate (such as a suction cup), which cooperates with the limiting groove opened on the electric rotating chassis 7 to clamp and fix the carton 6 from both the upper and lower ends. The connecting arm 8 is fixed to the side of the mounting plate 5. The wall extends along the rotation radius of the carton 6; the L-shaped plate 10 is slidably mounted on the lower end of the connecting arm 8, and its height is designed to be less than the distance between the limiting plate and the electric rotating chassis 7, so that it can slide against the side wall of the carton 6; the L-shaped plate 10 has two functional ends: the pressure head end 101 is used to slide against the side wall of the carton to squeeze out the air bubbles between the film and the carton; the arc-shaped convex head end 102 forms a gap with the side wall of the carton to stretch the film; the upper end of the crankshaft 9 is slidably connected to the connecting arm 8, and the lower end is rotatably connected to the L-shaped plate 10, so that the pressure head end 101 and the arc-shaped convex head end 102 can swing with the crankshaft 9 as the fulcrum to adapt to the slight unevenness of the carton surface.

[0024] A torsion spring is also provided at the rotatable connection between the crankshaft 9 and the L-shaped plate 10. In the initial state, the pressure head end 101 abuts against the side wall of the carton 6, and a gap is formed between the arc-shaped protrusion end 102 and the carton 6 to stretch the film wrinkles. When the film passes through the stretching gap, it will press the arc-shaped protrusion end 102 in the direction away from the carton 6. According to the lever principle, at this time the pressure head end 101 will swing towards the carton 6, squeezing the film on the periphery of the carton 6, so that the film and the carton 6 are more tightly bonded. Beneficial effects: Through the coordinated action of the electric rotating chassis 7 and the telescopic cylinder 4, the automatic clamping, rotation and lifting of the carton 6 are realized, which provides a foundation for the all-round and automated wrapping of film; The unique L-shaped plate 10 structure integrates the "bubble removal" function of the pressure head end 101 with the "film stretching" function of the arc-shaped convex head end 102 into one, and simultaneously completes compaction and leveling during the winding process, which significantly improves the flatness and tightness of the film wrapping and reduces bubbles and wrinkles. The sliding and swing connection design of crankshaft 9 gives L-shaped plate 10 a certain floating and self-adaptive ability, enabling it to effectively cope with different sizes of cartons, film tension changes or slight unevenness of carton surface, thus improving the applicability of the device and the stability of winding quality. In one embodiment, a groove 801 matching the upper end of the crankshaft 9 is provided in the connecting arm 8 along its length direction. The crankshaft 9 slides along the length direction of the groove 801. Preferably, the upper end of the crankshaft 9 is a rectangle matching the groove 801 to prevent the 9 from rotating on its own during sliding. An elastic element 803 is provided in the groove 801 along its length direction. One end of the elastic element 803 is fixed on the crankshaft 9, and the other end is fixedly installed on the end of the groove 801 away from the carton 6.

[0025] The elastic element 803 provides radial cushioning for the crankshaft 9 and the L-shaped plate 10. When the L-shaped plate 10 is subjected to a large lateral force due to the irregularity of the carton or the accumulation of film, the crankshaft 9 can compress the elastic element 803 to push it backward, avoiding hard damage to the carton or the device itself. During normal winding, the pre-tightening force of the elastic element 803 can push the L-shaped plate 10 to always adhere to the side wall of the carton 6 with a constant and moderate force, ensuring consistent film winding tightness and automatically compensating for the tolerance of carton size, thus simplifying the debugging process.

[0026] In one embodiment, a film roller 2 is also included, which is rotatably mounted on the upper end face of the base 1, and a film is wound on its surface for feeding the film; the film roller 2 is rotatably mounted on the upper end face of the base 1 via a bearing or a rotating shaft; a roll of film for packaging is wound on the core of the film roller 2 as a film supply source for the device.

[0027] In one embodiment, a flexible contact layer is provided on the side of the pressure head 101 facing the carton 6, and the radius of curvature of the arc-shaped protrusion 102 is adjustable.

[0028] Specifically, a flexible contact layer, such as rubber, silicone, or velvet, is adhered or covered on the working surface of the pressure head end 101 facing the carton 6. The radius of curvature of the arc-shaped protrusion end 102 is designed to be adjustable, for example, by using replaceable arc modules with different radii of curvature, or by changing the degree of protrusion of the arc portion through a built-in adjustment mechanism. The flexible contact layer can effectively prevent the hard pressure head end 101 from scratching or abrading the carton surface when extruding the film, which is especially suitable for packaging boxes with finely printed surfaces. At the same time, the flexible material provides greater friction, which helps to drive the film more effectively and expel air bubbles. The adjustable radius of curvature of the arc-shaped protrusion end 102 allows the device to optimize the shape and size of the "stretch gap" according to the thickness, elasticity, and other characteristics of the film used. For thicker and harder films, a larger radius of curvature can be used to obtain a smooth transition. For thinner and softer films, a smaller radius of curvature can be used to provide a more concentrated stretching force, thereby maximizing the elimination of wrinkles and improving adaptability to films of different materials.

[0029] In one embodiment, the horizontally rotatable limiting plate disposed at the lower end of the mounting plate 5 is a pneumatic suction cup or an electromagnetic suction cup.

[0030] Specifically, the "horizontally rotatable limiting plate" configured at the lower end of the mounting plate 5 for pressing the carton 6 from above is implemented as a pneumatic suction cup or an electromagnetic suction cup; when it is necessary to fix the carton, the suction cup is powered or vented to generate negative pressure, adsorbing the top of the carton; after the winding is completed, the negative pressure is released to release the carton; It adopts an adsorption fixing method, replacing the traditional mechanical pressure plate, avoiding the application of huge vertical pressure to the top of the carton, and is especially suitable for cartons containing fragile and easily deformed items, providing better protection.

[0031] The suction cup itself can rotate freely in the horizontal plane (or be connected via bearings), which means that when the electric rotating chassis 7 drives the carton to rotate, the suction point above will not restrict the rotation of the carton, eliminating torsional stress, making the rotation smoother, and reducing the risk of drive load and film wrinkling.

[0032] In one embodiment, the elastic element 803 is a compression spring or a nitrogen spring with adjustable preload, and the side wall of the slide 801 is provided with an observation window.

[0033] Specifically, the elastic element 803 is selected as a compression spring or a nitrogen spring with adjustable preload; for example, a threaded adjustment mechanism is provided at the end of the spring, and the initial compression of the spring is changed by a knob, thereby adjusting its preload; at the same time, a transparent observation window (such as an acrylic glass window) is machined on the side wall of the connecting arm 8 with the groove 801.

[0034] Employing adjustable preload compression springs or nitrogen springs allows operators to precisely adjust the baseline clamping force of the L-shaped plate 10 on the cartons based on the current strength of the wrapped carton, film characteristics, and required bonding force. This enables a single machine to handle a wide range of situations, from light-duty corrugated boxes to heavy-duty packaging boxes, offering exceptional process flexibility. Nitrogen springs also provide a more linear force curve and more stable performance.

[0035] In one embodiment, a film tension controller is also included, which is disposed on the film exit path of the film roller 2, for real-time detection and adjustment of the unwinding tension of the film.

[0036] Specifically, the device also includes a film tension controller. This controller is located on the film exit path of the film roller 2, specifically between the film roller 2 and the cardboard box 6; it includes a tension detection module such as a tension sensor, a pendulum detector, and a tension execution module such as a magnetic powder brake, a servo motor, and torque control; the controller detects the unwinding tension of the film in real time and compares it with a set value, and maintains a constant film tension by adjusting the braking resistance or driving torque of the film roller 2.

[0037] Stable film tension is key to achieving uniform and tight winding results. The film tension controller enables closed-loop automatic control of tension, which can overcome tension variations caused by factors such as changes in film roll diameter and rotation speed fluctuations, ensuring consistent film tightness from the start to the end of winding and significantly improving packaging quality.

[0038] This prevents the film from stretching, deforming, or even breaking due to excessive tension, and also avoids the film from loosening and piling up due to insufficient tension, thereby reducing material waste and production interruptions, and improving the reliability and efficiency of equipment operation.

[0039] In one embodiment, the connecting arm 8 is a telescopic structure, including a fixed section and a movable section driven by a linear drive mechanism.

[0040] Specifically, the connecting arm 8 is designed as a telescopic structure, which mainly consists of a fixed section (installed on the mounting plate 5) and a movable section (connecting the L-shaped plate 10); the two are connected by a linear drive mechanism (such as a built-in electric push rod, ball screw slider mechanism or cylinder); through the drive mechanism, the movable section can be extended or retracted, thereby changing the radial distance from the L-shaped plate 10 to the rotation center of the carton 6.

[0041] The device can quickly adapt to cartons 6 of different widths (or lengths). When changing the carton specifications, the length of the connecting arm 8 can be adjusted through the control system to move the L-shaped plate 10 to the appropriate working position. There is no need to replace mechanical parts or make complex mechanical adjustments, which greatly improves the versatility and production changeover efficiency of the equipment.

[0042] In one embodiment, a pressure sensor is provided on the support surface of the electric rotating chassis 7, and the pressure sensor, the telescopic cylinder 4, and the electric rotating chassis 7 are all electrically connected to a controller.

[0043] Specifically, a pressure sensor is embedded below the support surface or inside the limiting groove of the electric rotating chassis 7. The pressure sensor, the solenoid valve / servo motor driving the telescopic cylinder 4, and the drive motor of the electric rotating chassis 7 are all electrically connected to a controller (such as a PLC or industrial microcontroller). During operation, the pressure sensor monitors the pressure signal of the carton 6 on the chassis in real time and transmits it to the controller. The controller dynamically adjusts the downward pressure of the telescopic cylinder 4 and the start / stop / speed of the electric rotating chassis 7 according to the preset pressure logic.

[0044] Specifically, it features intelligent sensing and precise control of the carton clamping force. The controller ensures that the carton is firmly clamped (pressure not lower than the safety lower limit) without excessive compression that could deform the carton (pressure not higher than the safety upper limit), which is especially important for cartons with fragile contents, thus improving the safety of the packaging process.

[0045] Specifically, it realizes the linkage and intelligent control of the core execution components of the device (telescopic cylinder 4 and electric rotating chassis 7); for example, it can set safety logic such as "pressurize to the set value first and then start rotation" or "stop immediately if the pressure is abnormal during rotation", which improves the automation, intelligence level and operational reliability of the entire system. The controller can store packaging parameters of various products and realize one-click recall, making operation simple.

[0046] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A film wrapping device for packaging cardboard boxes in logistics, characterized in that, include: The base (1) and the top plate (3) are fixedly connected by a support column; An electric rotating chassis (7) is mounted on the support surface of the base (1) in a vertical direction; Telescopic cylinder (4) is fixed vertically on the lower end face of top plate (3) and coaxially arranged with electric rotating chassis (7). Its telescopic end is fixedly installed with mounting plate (5). The lower end of the mounting plate (5) is equipped with a horizontally rotatable limiting plate. A cardboard box (6) is placed between the limiting plate and the electric rotating chassis (7). A limiting groove matching the bottom of the cardboard box (6) is opened on the support surface of the electric rotating chassis (7). The connecting arm (8) is set on the side wall of the mounting plate (5) along the rotation radius direction of the carton (6); The L-shaped plate (10) slides along the length of the connecting arm (8) on the lower end face of the connecting arm (8) and is attached to the periphery of the carton (6). Its height is less than the distance between the limiting plate and the electric rotating chassis (7). The L-shaped plate (10) includes: The pressure head end (101) slides against the side wall of the carton (6) to squeeze out the air bubbles between the film and the side wall of the carton (6); The arc-shaped protruding end (102) forms a gap with the side wall of the carton (6) to facilitate the stretching of the film; The crankshaft (9) slides along the length of the connecting arm (8) at its upper end and is rotatably mounted on the L-shaped plate (10) at its lower end. The pressure head end (101) and the arc-shaped protrusion end (102) swing along the axial direction with the crankshaft (9) as the fulcrum.

2. The film wrapping device for packaging cartons for logistics as described in claim 1, characterized in that: The connecting arm (8) has a groove (801) that matches the upper end of the crankshaft (9) along its length direction. The crankshaft (9) slides along the length direction of the groove (801). An elastic element (803) is provided in the groove (801) along its length direction. One end of the elastic element (803) is fixed on the crankshaft (9), and the other end is fixedly installed on the end of the groove (801) away from the carton (6).

3. The film wrapping device for packaging cartons for logistics as described in claim 2, characterized in that: It also includes a film roller (2), which is rotatably mounted on the upper end face of the base (1), and a film is wound on its surface for placing the film.

4. The film wrapping device for packaging cartons for logistics according to claim 3, characterized in that: The pressure head end (101) is provided with a flexible contact layer on the side facing the carton (6), and the radius of curvature of the arc-shaped protrusion end (102) is adjustable.

5. A film wrapping device for packaging cartons for logistics according to claim 4, characterized in that: The horizontally rotatable limiting plate configured at the lower end of the mounting plate (5) is a pneumatic suction cup or an electromagnetic suction cup.

6. A film wrapping device for packaging cartons for logistics according to claim 5, characterized in that: The elastic element (803) is a compression spring or a nitrogen spring with adjustable preload, and the side wall of the slide (801) is provided with an observation window.

7. A film wrapping device for packaging cartons for logistics according to claim 6, characterized in that: It also includes a film tension controller, which is set on the film exit path of the film roller (2) to detect and adjust the unwinding tension of the film in real time.

8. A film wrapping device for packaging cartons for logistics according to claim 7, characterized in that: The connecting arm (8) is a telescopic structure, including a fixed section and a movable section driven by a linear drive mechanism.

9. A film wrapping device for packaging cartons for logistics according to claim 8, characterized in that: A pressure sensor is provided on the support surface of the electric rotating chassis (7), and the pressure sensor, the telescopic cylinder (4) and the electric rotating chassis (7) are all electrically connected to a controller.

10. A film wrapping device for packaging cartons for logistics according to claim 9, characterized in that: A torsion spring is also provided at the rotating connection between the crankshaft (9) and the L-shaped plate (10). In the initial state, the pressure head end (101) abuts against the side wall of the carton (6), and a gap is formed between the arc-shaped protrusion end (102) and the carton (6) to stretch the film wrinkles. When the film passes through the stretching gap, it will squeeze the arc-shaped protrusion end (102) in the direction away from the carton (6). At this time, the pressure head end (101) will swing towards the carton (6) and squeeze the film around the carton (6).

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