A wrapping film based packer

Abstract

This utility model relates to the field of packaging machinery technology, and in particular to a baling machine based on stretch film. A baling machine based on stretch film includes a frame with an arc-shaped shell on the frame. At least three rotating wheels are rotatably connected inside the arc-shaped shell. The rotating wheels collectively support and drive a rotating ring to rotate. A fixed frame is slidably connected at an eccentric position on the rotating ring. A sliding frame is provided on the rear side of the fixed frame, and rollers for pressing the film roll are installed on the sliding frame. The baling machine designed in this utility model is suitable for stretch film with a large width. Combined with the fact that when the film roll diameter decreases, the fixed frame automatically moves outward, increasing the revolution radius of the film roll, thereby compensating for the shortened single-turn film length caused by the reduction in film roll diameter. Compared with other types of baling equipment, it can distribute the packaging pressure more evenly on the surface of the goods during the wrapping operation, effectively reducing the risk of damage to the surface or corners of the goods due to excessive local pressure.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a wrapping machine based on stretch film. Background Technology

[0002] Stretch wrapping machines are common equipment used in logistics and warehousing to secure palletized goods. Currently, most mainstream models use a fixed-installation film roll with a fixed number of rotations. However, this mode has an inherent drawback: as the wrapping operation progresses, the outer diameter of the film roll continuously decreases. With the rotation center fixed, the actual film output length per rotation decreases sharply. This results in goods being wrapped tightly earlier in the same batch of work, while later goods are wrapped loosely, leading to highly unstable packaging quality and a risk of stacking collapse. To ensure basic effectiveness, operators have to increase the preset number of rotations, but this leads to excessive use of film in the first half of the process, resulting in significant waste. Utility Model Content

[0003] In order to overcome the shortcomings mentioned in the background art, the present invention provides a wrapping machine based on stretch film.

[0004] The technical solution of this utility model is as follows: A wrapping machine based on stretch film includes a frame, an arc-shaped shell on the frame, at least three rotating wheels rotatably connected inside the arc-shaped shell, a drive motor installed inside the arc-shaped shell, the output shaft of the drive motor being connected to one of the rotating wheels, the rotating wheels jointly supporting and driving the rotating ring to rotate, and the rotating wheel being located inside the rotating ring, a fixed frame being slidably connected at the eccentric position of the rotating ring, a sliding frame being provided on the rear side of the fixed frame, and rollers for pressing the film roll being installed on the sliding frame.

[0005] Furthermore, the rotating ring is provided with a guide groove, and the fixing frame slides in conjunction with the guide groove via a slider.

[0006] Furthermore, a slide rail is provided on the rear side of the fixed frame, and the sliding frame is slidably connected in the slide rail.

[0007] Furthermore, a rope connects the sliding frame and the fixed frame, and at least one guide wheel is provided along the path of the rope, with the guide wheel mounted on the rotating ring.

[0008] Furthermore, the elastic reset element is a tension spring, which is connected between the sliding frame and the rotating ring.

[0009] Furthermore, a fixing plate is detachably installed on the front side of the fixing frame to prevent the film roll from detaching.

[0010] Furthermore, a rotating plate is mounted on the upper part of the frame via an electric rotating shaft, and its initial position remains parallel to the upper side of the frame.

[0011] Furthermore, a cutting blade is mounted on the frame via an electric push rod.

[0012] Furthermore, the frame is equipped with an electric telescopic hook and a fixing plate 2 that is mounted via an electric push rod.

[0013] The beneficial effects of this invention are as follows: This invention achieves automatic compensation of the film-laying linear speed through the linkage of a rotating ring, a fixed frame, a tension spring, a sliding frame, and a roller. When the film roll diameter decreases, the fixed frame automatically moves outward under the action of the elastic reset component, increasing the film roll's revolution radius, thereby effectively compensating for the shortened single-turn film-laying length caused by the reduced film roll diameter. This ensures that the length of film delivered to the goods per unit time remains essentially constant throughout the entire winding process, guaranteeing a high degree of consistency in packaging tightness from the first item to the last, greatly improving the stability of packaging quality, and avoiding the risk of goods shifting or being damaged due to loose packaging.

[0014] This invention uses rollers on the sliding frame to press the film roll surface under elastic force, which stabilizes the film roll and prevents it from jumping. It can also adaptively maintain the initial tension of the film to a certain extent. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the arc-shaped shell and its internal parts of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the rotating wheel, drive motor, and rotating ring of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the fixed frame, sliding frame, rollers, and other parts of this utility model.

[0019] Figure 5 This is a three-dimensional structural diagram of the rope, guide wheel, and tension spring components of this utility model.

[0020] Figure 6 This is a three-dimensional structural diagram of the frame, rotating plate, and fixed plate of this utility model.

[0021] Figure 7 This is a three-dimensional structural diagram of the cutting blade, electric telescopic hook, and fixing plate of this utility model.

[0022] In the attached diagram, the following labels are used: 1-frame, 2-arc shell, 3-rotating wheel, 4-drive motor, 5-rotating ring, 6-fixed frame, 7-sliding frame, 8-roller, 9-slide rail, 10-rope, 11-guide wheel, 12-tension spring, 13-fixed plate one, 14-rotating plate, 15-cutting blade, 16-electric telescopic hook, 17-fixed plate two. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] The wrapping machine is compatible with a wide stretch film. Combined with its automatic compensation wrapping method, it can distribute the packaging pressure more evenly on the surface of the goods during wrapping operations compared to other types of packaging equipment. This effectively reduces the risk of damage to the surface or corners of the goods due to excessive local pressure. In actual production, the specific width can be selected by the staff according to the actual situation, which will not be elaborated here.

[0025] A type of wrapping machine based on stretch film, such as Figures 1-5 As shown, the device includes a frame 1, which serves as the basic support structure for the entire device. An arc-shaped shell 2 is fixedly mounted on the frame 1. The arc-shaped shell 2 is a semi-enclosed structure with its opening facing forward (i.e., the side where the membrane roll is installed). Inside the arc-shaped shell 2, four rotating wheels 3 are rotatably connected via bearing seats. These four rotating wheels 3 are arranged in a square at an inclination of 45°. A drive motor 4 is also fixedly mounted inside the arc-shaped shell 2. The output shaft of the drive motor 4 is directly connected to the central shaft of one of the rotating wheels 3 via a coupling, thereby providing driving force. The four rotating wheels 3 together support and drive a rotating ring 5. The rotating ring 5 is located around the rotating wheels 3, and the outer circumferential surface of the rotating wheels 3 is in close contact with the inner circumferential surface of the rotating ring 5.

[0026] like Figures 3-5As shown, the core improvement of this utility model lies in the radially extending guide groove provided on the rotating ring 5 at a position off-center (i.e., eccentric point). A fixed frame 6 forms a sliding engagement with the guide groove through a slider on it, allowing the fixed frame 6 to slide radially along the rotating ring 5. On the front side of the fixed frame 6 (i.e., the side away from the arc-shaped shell 2), a fixed plate 13 is detachably installed by a quick-release buckle or bolt. The fixed plate 13 is used to prevent the membrane roll from detaching. A slide rail 9 is provided on the front side of the fixed frame 6. A sliding frame 7 engages with the slide rail 9 through a slider, thereby sliding along the length direction of the slide rail 9. On the sliding frame 7, a roller 8 is rotatably mounted through a bearing. The position of the roller 8 is designed so that it can press against the outer surface of the membrane roll after it is installed in place. To achieve the motion linkage between the fixed frame 6 and the sliding frame 7, a rope 10 (which can be a steel wire rope or a high-strength fiber rope) is connected between the two. One end of the rope 10 is fixed. The first end is fixed on the sliding frame 7, and the second end is fixed on the fixed frame 6 after passing over the guide wheel 11. The guide wheel 11 is installed on the rotating ring 5, that is, the rope 10 passes through the rotating ring 5. The winding method of the rope 10 allows the fixed frame 6 to be pulled by the rope 10 when the sliding frame 7 is subjected to force. The key component that provides the reset and compensation power is the tension spring 12. One end of the tension spring 12 is connected to the sliding frame 7, and the other end is connected to the rotating ring 5. In the initial state (that is, when the full roll of film is installed), the tension spring 12 has been pre-stretched and is in an energy storage state. At this time, the diameter of the film roll is the largest, and its surface generates an outward thrust on the roller 8. This thrust further stretches the tension spring 12 through the sliding frame 7. At the same time, through the transmission of the rope 10 and the guide wheel 11, it generates a pulling force on the fixed frame 6, causing it to slide towards the center of the rotating ring 5. At this time, the rotation center of the film roll on the fixed frame 6 (that is, the rotation center of the film) is close to the rotation center of the rotating ring 5, but it also moves in a circle with the rotating ring 5.

[0027] like Figure 6 and Figure 7 As shown, a rotating plate 14 is mounted on the upper part of the frame 1 via an electric rotating shaft. Its initial position is kept parallel to the upper side of the frame 1. A cutting blade 15 is mounted on the frame 1 via an electric push rod. An electric telescopic hook 16 and a fixing plate 17 mounted on the frame 1 via an electric push rod are also mounted on the frame 1.

[0028] The worker first places the goods on the rotating plate 14 and pulls the film roll so that one end of the wrapping film is between the goods and the rotating plate 14. Then, the drive motor 4 is started. When the output shaft of the drive motor 4 drives the rotating wheel 3 and the rotating ring 5 to rotate, the fixed frame 6 and the film roll, sliding frame 7 and roller 8 on it revolve as a whole to perform the wrapping and film release operation. During this process, before the rotating ring 5 rotates, the electric rotating shaft drives the rotating plate 14 to rotate downwards by about 90 degrees so that its plate surface is vertically downwards, preventing the residual film from accidentally tangling with the goods and the stationary rotating plate 14 during the subsequent cutting and clamping process. When a single item is packaged, the electric push rod pushes the cutting blade 15 to move quickly and cut the film located between the cutting blade 15 and the goods. Almost simultaneously with the cutting, the electric telescopic hook 16... Extending forward, the electric telescopic hook 16 hooks the film segment located between the cutting blade 15 and the film roll. Then, the electric telescopic hook 16 retracts, causing the end of the film to move backward. At the same time, the electric push rod pushes the fixing plate 17 forward, forming a clamping point together with the hook body of the retracted electric telescopic hook 16, firmly pressing and fixing the end of the film. After the film is clamped, the electric rotating shaft drives the rotating plate 14 to rotate upward back to the initial horizontal position, preparing for the next packaging operation.

[0029] As the winding process continues, the diameter of the film roll gradually decreases. As the diameter decreases, the outward pushing force on the roller 8 weakens. At this point, the restoring force of the tension spring 12, which is always under tension, becomes dominant. It attempts to contract, and this restoring force pulls the sliding frame 7 along the slide rail 9 towards the fixed frame 6, thus ensuring that the roller 8 remains tightly pressed against the gradually shrinking film roll surface, stabilizing the film roll and reducing sway. The movement of the sliding frame 7 alters the force transmission through the rope 10 and guide wheel 11. The guide wheel 11 ensures that the movement of the fixed frame 6 must pass through the area where the rope 10 moves on the rotating ring 5. The restoring force of the tension spring 12, while attempting to pull the sliding frame 7, also... The tension on the fixing frame 6 towards the center is released by the rope 10. Therefore, under the overall action of the restoring force of the tension spring 12, the fixing frame 6 will gradually slide outward (i.e. away from its rotation center) along the guide groove on the rotating ring 5. As the fixing frame 6 slides outward, the rotation center of the film roll gradually moves away from the rotation center of the rotating ring 5. This increases the radius of the film roll's revolution. Therefore, even if the diameter of the film roll itself is decreasing, because its rotation radius is increasing, the actual length of film pulled out from the film roll per revolution of the rotating ring 5 can remain relatively stable or decrease by a much smaller margin than in the traditional method. This automatically compensates for the decrease in packaging strength caused by the reduction in the diameter of the film roll.

[0030] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A wrapping machine based on stretch film, characterized in that, The machine includes a frame (1), an arc-shaped shell (2) on the frame (1), at least three rotating wheels (3) are rotatably connected inside the arc-shaped shell (2), a drive motor (4) is installed inside the arc-shaped shell (2), the output shaft of the drive motor (4) is connected to one of the rotating wheels (3) for transmission, the rotating wheels (3) are together to drive the rotating ring (5) to rotate, and the rotating wheel (3) is located inside the rotating ring (5). A fixed frame (6) is slidably connected at the eccentric position of the rotating ring (5), a sliding frame (7) is provided on the rear side of the fixed frame (6), and a roller (8) for pressing the film roll is installed on the sliding frame (7).

2. A wrapping machine based on stretch film as described in claim 1, characterized in that, The rotating ring (5) is provided with a guide groove, and the fixed frame (6) slides with the guide groove through a slider.

3. A wrapping machine based on stretch film as described in claim 2, characterized in that, The rear side of the fixed frame (6) is provided with a slide rail (9), and the sliding frame (7) is slidably connected in the slide rail (9).

4. A wrapping machine based on stretch film as described in claim 3, characterized in that, A rope (10) is connected between the sliding frame (7) and the fixed frame (6). At least one guide wheel (11) is provided on the path of the rope (10), and the guide wheel (11) is installed on the rotating ring (5).

5. A wrapping machine based on stretch film as described in claim 4, characterized in that, The elastic reset element is a tension spring (12), which is connected between the sliding frame (7) and the rotating ring (5).

6. A wrapping machine based on stretch film as described in claim 4, characterized in that, A fixing plate (13) is detachably installed on the front side of the fixing frame (6). The fixing plate (13) is used to prevent the film roll from detaching.

7. A wrapping machine based on stretch film as described in claim 1, characterized in that, A rotating plate (14) is mounted on the upper part of the frame (1) via an electric rotating shaft, and its initial position is kept parallel to the upper side of the frame (1).

8. A wrapping machine based on stretch film as described in claim 7, characterized in that, A cutting blade (15) is mounted on the frame (1) via an electric push rod.

9. A wrapping machine based on stretch film as described in claim 8, characterized in that, An electric telescopic hook (16) and a fixed plate (17) installed by an electric push rod are mounted on the frame (1).

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