Spherical fruit and vegetable packaging drum

Abstract

The utility model provides a kind of spherical fruit and vegetable packaging roller, for spherical fruit and vegetable cover preservative film packaging, including rack and the multiple-sided rotating wheel host set on it, driving mechanism and controller;The multiple-sided rotating wheel host rotation is arranged on rack, and it includes several same structures and sequentially rotates to position work surface, each work surface is equipped with inductively open and close feed inlet, and the inside of each feed inlet is correspondingly provided with a clamping jaw screwing mechanism;Each work surface is equipped with the film pressing mechanism that fixes the both sides of preservative film. The utility model places the fruit and vegetable of approximate spherical in the center position of a cut suitable size square preservative film, then opens feed inlet, fruit and vegetable fall into the clamping jaw screwing mechanism in lower with preservative film, clamping jaw screwing mechanism in gathering preservative film wraps up fruit and vegetable, feed inlet is closed and the upper end of preservative film, i.

Description

Technical Field

[0001] This utility model relates to the field of agricultural processing equipment, and in particular to a spherical fruit and vegetable packaging roller. Background Technology

[0002] Plastic wrap is a highly effective plastic packaging film for extending the shelf life of food and fresh fruits and vegetables. After packaging, it isolates the contents from oxygen, prevents moisture loss, and inhibits bacterial invasion, thus extending shelf life while preserving the freshness and original flavor of the food and produce. The preservation effect of plastic wrap is significantly superior to other packaging films. However, because plastic wrap is too thin and soft, it is not effective when heat-sealed using traditional packaging methods. Problems such as insecure heat seals, holes appearing in the heat-sealed area due to melting, or looseness between the plastic wrap and the packaged goods after packaging can affect packaging quality.

[0003] Nearly spherical fruits and vegetables, such as lemons, passion fruit, oranges, tangerines, and tomatoes, are currently mostly packaged using pillow-type packaging machines after perforating the packaging film. This method offers no additional preservation effect. Furthermore, the inherent characteristics of plastic wrap prevent it from achieving the same level of individual fruit and vegetable packaging as pillow-type packaging machines. Traditional pillow-type packaging machines offer fast packaging speeds for fruits and vegetables; therefore, if plastic wrap were to be used, the packaging speed would also need to be high enough to meet production capacity requirements. Utility Model Content

[0004] This utility model proposes a spherical fruit and vegetable packaging roller, which can quickly cover spherical fruits and vegetables with film, and the film will not loosen or fall apart after being tightened.

[0005] The technical solution of this utility model is as follows: a spherical fruit and vegetable packaging roller for covering spherical fruits and vegetables with a protective film, including a frame and a multi-faceted rotating main unit, a drive mechanism and a controller installed on it;

[0006] The multi-faceted rotary main unit is rotatably mounted on the frame. It includes several working surfaces with the same structure that rotate into position in sequence. Each working surface is provided with a feed port that is opened and closed by a sensor, and a gripper tightening mechanism is provided on the inner side of each feed port. Each working surface is provided with a film pressing mechanism that fixes the two sides of the plastic wrap.

[0007] The clamping and tightening mechanism is located inside the multi-faceted rotary main unit and corresponds to the feed inlet. It includes a clamping component and a rotating component. The clamping component is used to clamp the falling spherical fruits and vegetables and the pressed-down plastic wrap together. The rotating component is used to control the clamping component to rotate rapidly to continuously tighten the plastic wrap into a rope shape.

[0008] The drive mechanism is located on one side of the multi-faceted rotary host. The controller drives the multi-faceted rotary host to rotate and brake through the drive mechanism, so that each working surface completes the packaging work in sequence.

[0009] Preferably, the multi-faceted rotary main unit includes a body and a main unit shaft. The body is a regular polyprism structure, including two end faces and several working surfaces of the same shape and size. The two main unit shafts are located at the center of the two end faces and are mounted on the frame through bearings.

[0010] Preferably, one end face is engaged with the drive mechanism to drive rotation, and the other end face is provided with a pneumatic slip ring on the frame for transmitting signals from the controller; one end of the main shaft is coaxially provided with a shaft gear parallel to the end face, and the drive mechanism is provided on the adjacent frame and engages with the shaft gear to drive the machine body to rotate.

[0011] Preferably, the main unit's rotating shaft is equipped with two slotted photoelectric switches, namely a positioning photoelectric switch and a reset photoelectric switch. The positioning photoelectric switch is used to sense the rotational positioning state of each working surface and has light-blocking blades that are the same number as the working surfaces. The reset photoelectric switch has a light-blocking blade on its rotating wheel to sense the initial working surface position of the multi-faceted rotating main unit.

[0012] Preferably, each working surface has a corresponding mechanical aperture device at the feed inlet, which is controlled by a controller to open and close. Each mechanical aperture device is provided with a clamping and tightening mechanism below it, which is fixedly installed inside the machine body by a bracket.

[0013] Preferably, the gripper tightening mechanism includes a mounting frame and a gripping component and a rotating component disposed thereon. The gripping component includes several evenly distributed gripper bodies and a slide rod connected below them, as well as a lifting device for driving the slide rod to retract for gripping. The rotating component includes a rotary motor disposed below the mounting frame, and the output end of the rotary motor is connected to the slide rod through a rotating seat.

[0014] Preferably, the lifting device includes a lifting cylinder, an outer liner ring, an inner liner ring, and a liner ring bearing. There are two lifting cylinders, symmetrically arranged on the lower side of the mounting frame. The outer liner ring and the inner liner ring are connected by the liner ring bearing. The bottom surface of the outer liner ring is contacted and pushed by the lifting end of the lifting cylinder, and the outer side of the slide rod is contacted and pushed by the inner surface of the inner liner ring. The output end of the rotary motor is fixedly connected to a rotating seat. Several slide rods are connected around the rotating seat by hinges. The slide rods swing up and down in the vertical plane along the hinges.

[0015] Preferably, each working surface has two symmetrically arranged feed ports and two mechanical aperture devices corresponding to the feed ports, and the two mechanical aperture devices are driven by the same mechanical aperture motor.

[0016] Preferably, the film pressing mechanism includes a film pressing plate and a lifting drive component connected thereto. The lifting drive component is a lifting cylinder installed on the inner wall of the machine body. The film pressing plate consists of three parallel elongated pressing plates, located in the middle and on both sides of the working surface, respectively. Each film pressing plate has hemispherical structures with rounded edges at both ends.

[0017] Preferably, the body is a hollow hexagonal prism structure with a regular hexagonal end face and six rectangular surfaces of the same size.

[0018] Compared with existing technologies, the advantages of this invention are as follows: Nearly spherical fruits and vegetables are placed in the center of a pre-cut square piece of cling film of a suitable size. The inlet is then opened, and the fruits and vegetables fall into the clamping and tightening mechanism below. The clamping and tightening mechanism gathers the cling film to wrap the fruits and vegetables, closes the inlet, and secures the upper edge of the cling film. The clamping and tightening mechanism continuously tightens the cling film until it completely adheres to the fruits and vegetables and is moderately stretched. At this point, the tightened cling film at the rear end is in a very tight rope-like state. This method achieves close-fitting packaging of near-spherical fruits and vegetables. It has excellent preservation effects, and the packaging appearance is tight and transparent, with a strong visual impact. Furthermore, because the cling film is much thinner than the packaging film used in pillow packaging machines, the price of cling film for the same area is significantly lower than that used in pillow packaging machines, greatly reducing packaging costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the multi-faceted rotary main unit of this utility model;

[0020] Figure 2 In this utility model Figure 5 The corresponding main view;

[0021] Figure 3 This is an internal front view of the multi-faceted rotary main unit of this utility model;

[0022] Figure 4 This is a structural schematic diagram of the working surface and its upper accessories of this utility model;

[0023] Figure 5 This is a schematic diagram of the gripper tightening mechanism in this utility model;

[0024] Figure 6 This is a cross-sectional view of the gripper tightening mechanism in this utility model;

[0025] Figure 7 This is a schematic diagram of the overall structure of one embodiment;

[0026] Figure 8 This is a schematic diagram of the main body structure of one embodiment;

[0027] Figure 9 for Figure 8 The corresponding left view;

[0028] Figure 10 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0029] Figure 11 This is a schematic diagram of spherical fruits and vegetables after being coated and packaged using the equipment of this utility model.

[0030] In the diagram: 1. Multi-faceted rotary main unit; 2. Gripper tightening mechanism; 3. Film feeding mechanism; 4. Film cutting mechanism; 5. Perforating mechanism; 6. Film pressing mechanism; 7. Feeding channel; 8. Drive mechanism; 9. Frame; 10. Film suction mechanism;

[0031] 11. Working surface; 12. End face; 13. Main machine shaft; 14. Shaft gear; 15. Feed inlet; 16. Mechanical aperture device; 17. Position photoelectric switch; 18. Pneumatic-electric slip ring; 19. Reset photoelectric switch; 161. Aperture gear; 162. Mechanical aperture motor;

[0032] 21. Gripper body; 22. Slide rod; 23. Rotary motor; 24. Rotary seat; 25. Outer liner ring; 26. Inner liner ring; 27. Lifting cylinder; 28. Pressure reducing valve; 29. ​​Liner ring bearing;

[0033] 31. Film feeding roller; 32. First transition roller; 33. Second transition roller; 34. Resistance tensioning element; 35. Plastic wrap;

[0034] 61. Pressing plate; 62. Lifting linkage; 63. Lifting cylinder. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] See Figure 1-3 A spherical fruit and vegetable packaging roller is used to cover spherical fruits and vegetables with a plastic wrap 35. It includes a frame 9 and a multi-faceted rotary main unit 1, a drive mechanism 8 and a controller mounted on it. The multi-faceted rotary main unit 1 is rotatably mounted on the frame 9. It includes several working surfaces 11 with the same structure that rotate into position in sequence. Each working surface 11 is provided with a feed port 15 that is opened and closed by a sensor. A gripper tightening mechanism 2 is provided on the inner side of each feed port 15. Each working surface 11 is provided with a film pressing mechanism 3 that fixes the two sides of the plastic wrap 35. The multi-faceted rotary main unit 1 is a hollow hexagonal prism structure with a regular hexagonal end face 12. All six working surfaces 11 are rectangular surfaces of the same size.

[0039] The gripper tightening mechanism 2 is located inside the multi-faceted rotary host 1 and corresponds to the feed inlet. It includes a clamping component and a rotating component. The clamping component is used to clamp the falling spherical fruits and vegetables and the pressed-down plastic wrap 35 together. The rotating component is used to control the clamping component to rotate rapidly to continuously tighten the plastic wrap 35 into a rope shape. The drive mechanism 8 is located on one side of the multi-faceted rotary host 1. The controller drives the multi-faceted rotary host 1 to rotate and brake through the drive mechanism 8, so that each working surface 11 completes the packaging work in sequence.

[0040] The multi-faceted rotary head unit 1 includes a body and a main shaft 13. The body is a regular polygonal prism structure, including two end faces 12 and several working surfaces 11. The main shaft 13 is located at the center of the two end faces 12 and is mounted on the frame 9 through bearings. A rotating shaft gear 14 is coaxially arranged at one end of the main shaft 13. The drive mechanism 8 is arranged on the frame 9 adjacent to the rotating shaft gear 14 and drives the body to rotate. The body is a hollow hexagonal prism structure, with its end faces 12 being regular hexagons. The six working surfaces 11 are all rectangular surfaces of the same size. The working surfaces 11 are provided with a feed port 15 and a mechanical aperture device 16. A clamping and tightening mechanism is correspondingly arranged below each mechanical aperture device 16. The clamping and tightening mechanism is fixedly installed inside the body by a bracket.

[0041] The multi-faceted rotary host 1 is mounted on the frame 9 via the host shaft 13 and rotates via the drive mechanism 8. It includes six identical working surfaces 11 and two end faces 12. During rotation, each working surface 11 sequentially performs spherical fruit and vegetable film packaging. Each working surface 11 is equipped with an automatically sensing and opening inlet 15, and each inlet 15 corresponds to a gripper tightening mechanism 2. One end face 12 cooperates with the drive mechanism 8 to drive the multi-faceted rotary host 1 to rotate. The frame 9 corresponding to the other end face 12 is equipped with a pneumatic-electric slip ring 18 for transmitting control signals and the required power and air inputs. The pneumatic-electric slip ring 18 ensures stable transmission of signals, power, and air while the multi-faceted rotary host 1 is continuously rotating, which is simpler and more convenient than using cables and pipes for transmission.

[0042] The main shaft 13 is equipped with two slotted photoelectric switches: a positioning photoelectric switch 17 and a reset photoelectric switch 19. The positioning photoelectric switch 17 has multiple evenly distributed light-blocking blades (the same number as the working surfaces 11 of the multi-faceted rotary main unit 1) on its rotating wheel. These blades, in conjunction with a photoelectric sensor, detect the rotational positioning status of each working surface 11. The reset photoelectric switch 19 has a light-blocking blade on its rotating wheel, which corresponds to the initial working surface 11 position of the multi-faceted rotary main unit 1 and can detect the initial working surface 11 position. The servo motor can accurately drive the multi-faceted rotary main unit 1 to the precise position of each surface, and the slotted photoelectric switches confirm the rotation positioning and initial surface reset. The positioning photoelectric switch 17 and the reset photoelectric switch 19 accurately sense the rotational position and generate a signal sent to the controller for subsequent control.

[0043] See Figure 4 , 56. The gripper tightening mechanism 2 includes a mounting frame and a gripping component and a rotating component disposed thereon. The gripping component includes several evenly distributed gripper bodies 21 and a slide rod 22 connected below them, as well as a lifting device for driving the slide rod 22 to retract for gripping. The rotating component includes a rotary motor 23 disposed below the mounting frame. The output end of the rotary motor 23 is connected to the slide rod 22 through a rotating seat 24. The lifting device includes a lifting cylinder 27, an outer liner ring 25, an inner liner ring 26, and a liner ring bearing 29. There are two lifting cylinders 27, which are symmetrically arranged on the lower side of the mounting frame. The outer liner ring 25 and the inner liner ring 26 are connected by the liner ring bearing 29. The bottom surface of the outer liner ring 25 is contacted and pushed by the lifting end of the lifting cylinder 27, and the outer side of the slide rod 22 is contacted and pushed by the inner surface of the inner liner ring 26. The output end of the rotary motor 23 is fixedly connected to a rotating seat 24. Several slide rods 22 are connected around the rotating seat 24 by hinges. The slide rods 22 swing up and down in the vertical plane along the hinges.

[0044] The lifting cylinder 27 lifts the outer ring 25, which houses the inner ring bearing 29. The inner ring 26 is located within the inner ring of the inner ring bearing 29. As the outer ring 25 is lifted, the inner ring bearing 29 and the inner ring 26 also rise. Each gripper body 21 has a sliding rod 22 connected to it. The sliding rod 22 is attached to the inner ring 26 due to gravity and the preload of the tension spring. Both the surfaces of the sliding rod 22 and the inner ring 26 are very smooth, resulting in a low coefficient of friction. As the inner ring 26 rises, the contact point between the sliding rod 22 and the inner ring 26 moves upward. Under the action of the hinge, the sliding rod 22, along with the gripper body 21 connected to it, retracts towards the center, thereby achieving the purpose of clamping the packaged goods.

[0045] One side of the working surface 11 is also equipped with a pressure reducing valve 28 that separately controls the air pressure of the gripper body 21. This valve is used to adjust the appropriate clamping force to hold the packaged goods, accommodating spherical fruits and vegetables of different sizes. The magnitude of the clamping force directly determines the firmness of the gripping and the extent of damage. Therefore, the clamping force must be adjustable to achieve the appropriate clamping state. The magnitude of the clamping force is directly proportional to the lifting force of the push cylinder 27. The push cylinder 27 uses an independent pressure reducing valve 28 to regulate the air pressure, thereby achieving the purpose of adjusting the clamping force. As the gripper body 21 retracts towards the center, the tension spring connected to the gripper body 21 is stretched longer. When the gripper body 21 needs to be opened, the push cylinder 27 descends, and the outer liner ring 25, the liner ring bearing 29, and the inner liner ring 26 follow suit. Under the action of the tension spring, all gripper bodies 21 extend outwards to open. When the multi-faceted rotary host 1 rotates the working surface 11 downwards, the gripper body 21 and the mechanical aperture device 16 open, and the fruits and vegetables fall into the recycling device below by gravity.

[0046] The clamping component grips the fruits and vegetables, while the mechanical aperture device 16 gathers and clamps the cling film 35 on top of the packaging. The timing of the clamping jaw tightening mechanism 2 and the mechanical aperture device 16 can be coordinated according to different product types to achieve the best packaging effect. Subsequently, the rotating component containing the mechanical aperture device 16 drives the clamping component to rotate multiple times, causing the cling film 35 to continuously twist and completely adhere to the packaging. Then, the mechanical aperture device 16 opens, followed by the opening of the clamping component. After the clamping component grips the fruits and vegetables, the multi-faceted rotary host 1 rotates under the drive mechanism 8, and this rotational movement moves the next working surface 11 of the multi-faceted rotary host 1 to the packaging position.

[0047] The synchronous rotation of the gripper tightening mechanism 2 inside the machine body ensures that the packaging time does not affect the overall packaging speed, thus achieving the requirement of high-speed packaging. Finally, the packaged items are rotated by the multi-faceted rotary main unit 1 and fall downwards or directly downwards under the influence of gravity onto the discharge conveyor line for discharge.

[0048] Figure 4 , 5 In each working surface 11, two mechanical aperture devices 16 are arranged side by side, and a single aperture gear 161 controls the two mechanical aperture devices 16 synchronously. A mechanical aperture motor 162 is located on the inner side of the working surface 11, connecting to and driving the aperture gear 161 to rotate, achieving the effect of simultaneous opening and closing of the two mechanical aperture devices 16, simplifying parts and improving work efficiency. The mechanical aperture devices 16 and the film pressing mechanism 6 are both located on the outer side of the working surface 11, forming a single equipment surface. The two mechanical aperture devices 16 on each equipment surface work in conjunction, controlled synchronously by the same aperture gear 161. A zero-position switch 29 for adjusting the mechanical aperture devices 16 is also provided on the equipment surface; with the two mechanical aperture devices 16 linked together, a single zero-position switch 29 can achieve synchronous adjustment.

[0049] The mechanical aperture device 16 operates on the same principle as a camera aperture, using a rotating slider to move the blades, ultimately allowing the blades to close and open the circular opening. After the plastic wrap 35 is gathered, the sharp corners of the small triangular sides face inwards, pressing against the held plastic wrap 35, making it less prone to displacement during twisting. The applicant's published patent, "A Spherical Fruit and Vegetable Plastic Wrapping Machine" (application number CN202411042202.2), discloses the specific structure and working principle of the mechanical aperture device 16. This application uses the same working principle, so it will not be elaborated upon further.

[0050] The film pressing mechanism 6 is disposed on the surface of each working surface 11 of the multi-faceted rotary main unit 1 and located on both sides of each feed port 15. It is used to press the two sides of the plastic wrap 35 tightly against the working surface 11. The film pressing mechanism 6 includes a film pressing plate 61 and a lifting drive component connected thereto. The lifting drive component is a lifting cylinder 63 disposed on the inner wall of the machine body. The film pressing plate 61 consists of three parallel elongated pressing plates, located in the middle and on both sides of the working surface 11, respectively. Each film pressing plate 61 has hemispherical structures with rounded edges at both ends. The width of the middle film pressing plate 61 is greater than that of the two side film pressing plates 61, and the two side film pressing plates 61 are only hemispherical on the inner side, while the two sides of the middle film pressing plate 61 are both hemispherical. The width of the plastic wrap 35 is slightly larger than the distance between two adjacent pressing plates 61. In normal state, the plastic wrap 35 is located above the pressing plate 61, but when the hexahedron rotates, it is pressed into the center under the additional tension. The two sides of the plastic wrap 35 slide down the spherical surface of the pressing plate 61 and into the underside of the pressing plate 61.

[0051] Example 1: See Figure 7 , 8 9. This roller equipment is equipped with a film feeding mechanism 3, a punching mechanism 5, a film cutting mechanism 4, and a feeding channel 7 that can sense the placement of fruits and vegetables; each feeding channel 7 is equipped with a film suction mechanism 10 that keeps the plastic wrap 35 in an extended state.

[0052] The film-laying mechanism 3 is mounted on the frame 9 and located on one side of the multi-faceted rotary host 1, and is used for the installation, unwinding, traction, and laying of the plastic wrap 35; the punching mechanism 5 is located in the running path of the film-laying mechanism 3, and is used to punch an air vent in the middle of the plastic wrap 35 when it enters the multi-faceted rotary host 1; the film-cutting mechanism 4 is located above the side of the frame 9, and is used to cut the plastic wrap 35 and quickly retract it before packaging is completed.

[0053] The fruit and vegetable inlet is equipped with a funnel-like feeding channel 7. A sensor is installed at the end of the feeding channel 7 to detect whether any fruit or vegetable has fallen in. When it is detected that a fruit or vegetable has fallen in on both sides, the pressing plate 61 on the working surface 11 immediately lifts up completely, releasing two plastic wraps 35. The plastic wraps 35 fall into the corresponding gripper device under the gravity of the fruit and vegetables.

[0054] The film-laying mechanism 3 includes a film-laying roller 31 for mounting the plastic wrap 35, and a first transition roller 32 and a second transition roller 33 for transmitting the plastic wrap 35 and providing tension. Each roller is arranged parallel to the axis of the multi-faceted rotary main unit 1. A resistance tensioning member 34 is provided on one side of the film-laying roller 31 to provide tension. The perforating mechanism 5 is mounted on the frame 9 and located between the first transition roller 32 and the second transition roller 33 of the film-laying mechanism 3.

[0055] After the cling film 35 is cut, it rotates rapidly into the working position due to the high packaging speed requirements. At this time, the cling film 35 in the front direction of rotation is blown backward and deformed by the reverse airflow generated by the high-speed rotation, sticking together due to its own adhesiveness. This is especially severe in the middle of the front direction of rotation, where the cling film 35 becomes wavy, significantly reducing its actual unfolded area, particularly in the middle. Because the actual unfolded area of ​​the cling film 35 is reduced, there is a high probability of holes appearing when the packaging film is gathered and clamped by the mechanical aperture device 16 during subsequent packaging. This means that parts of the fruit and vegetables are not covered by the cling film 35, resulting in packaging defects and reduced preservation effect. Furthermore, because the packaging process relies on the weight of the fruit and vegetables to pull the cling film 35 downward, it cannot be fixed to the packaging surface by adhesive.

[0056] The film suction mechanism 10 is located above the multi-faceted rotary host 1 and away from the film-laying mechanism 3, adjacent to the feeding channel 7, and just above the front end of the cling film 35. The film suction mechanism 10 can be configured with, but is not limited to, fan suction, electrostatic suction, or plasma blowing; it only needs to hold the edges of the cling film 35 in place to prevent it from shrinking towards the center. In this design, the film suction mechanism 10 consists of several fans arranged side-by-side, blowing upwards to generate a continuous upward suction force. The fans are similar in size to computer graphics card fans, and the airflow attracts the cling film 35 without tearing or pulling it. By installing a suitable suction film mechanism 10 at an appropriate position above and in front of the packaging area, the cling film 35, which is being blown upwards by the reverse airflow of the suction film mechanism 10 during its rotation, is drawn upwards without affecting the movement of the cling film 35. The exhaust device operates continuously, keeping the cling film 35 in an upward and extended state at all times. The exhaust force is moderate, allowing the cling film 35 to quickly detach from the suction film mechanism 10 when the fruits and vegetables are pressed down. In actual packaging, this achieves the same effect as if the cling film were completely flat on the packaging surface. It should be noted that the cling film 35 continues to rotate rapidly while being blown by the reverse airflow; therefore, the suction film mechanism 10 should be installed on a specific path, and the exhaust position needs to be adjusted according to the type of cling film 35.

[0057] The feeding channel 7 and the film suction mechanism 10 are two and arranged side by side. Each working surface 11 is provided with two feeding ports 15 and mechanical aperture devices 16. The machine body is provided with six sets of clamping and tightening mechanisms, each set consisting of two clamping and tightening mechanisms arranged side by side. To achieve a higher packaging speed, this utility model uses two parallel packaging stations on the same packaging surface, and uses a single motor to drive the two parallel mechanical aperture devices 16, thus achieving the requirements of increasing packaging speed and reducing equipment costs. If a higher packaging speed is required, more packaging stations can be added to the same packaging surface, the number of faces of the hexahedron can be changed, or the operating speed of the external rotating device can be changed to meet the requirements of increasing the final packaging speed.

[0058] Each time the multi-faceted rotary host 1 rotates to one working position, the cling film 35 is automatically supplied. The time required for each packaging cycle is only the time for the hexahedron (i.e., the multi-faceted rotary host 1) to rotate to the correct position and the time for the fruit and vegetables to fall and be clamped. The total time required is extremely short. The remaining packaging actions are all completed inside the hexahedron. The packaged items are discharged by gravity through the rotation of the hexahedron, thereby achieving the effect of high-speed packaging. The plastic wrap 35 is pulled out from the film feeding mechanism. When the drive mechanism 8 drives the multi-faceted rotary host 1 to rotate by a working angle, it cuts into the upper rear hexahedral surface. At this time, the pressure plate 61 on the upper rear of the hexahedron is in a lifted state. The cutting of the plastic wrap 35 is completed during the rotation of the hexahedron. After the hexahedron is rotated, the pressure plate 61 on the upper rear of the hexahedron presses down, firmly pressing the plastic wrap 35 onto the current surface. At this time, the plastic wrap 35 on the previous working surface 11 is also in a pressed state. The film cutting mechanism 4 starts to cut the plastic wrap 35 and quickly retracts. The film feeding process is completed, and the equipment is now in a state of waiting for packaging.

[0059] Example 2: As Figure 10 As shown in the implementation plan, the outlet can be connected to the inclined conveyor line and integrated into the subsequent production line. A conveyor line is set on each side of the equipment, with the end of the conveyor line located above the feed channel 7 of the equipment. The conveyor line and feed channel 7 correspond one-to-one. The spherical fruits and vegetables being conveyed fall from the end of the conveyor line into the feed channel 7. Upon passing through, a photoelectric detection switch is triggered, transmitting a signal to the controller. The controller then operates further: the film-cutting mechanism 4 cuts the plastic wrap 35, making the plastic wrap 35 on the working surface 11 a single square film; the film-pressing mechanism 6 opens to release the plastic wrap 35; and simultaneously, the mechanical aperture mechanism opens. The spherical fruits and vegetables, pressing against the plastic wrap 35, fall into the gripper tightening mechanism 2 below. The gripper tightening mechanism 2 holds the falling fruits and vegetables. Then, the mechanical aperture mechanism closes and holds the upper end of the plastic wrap 35. The gripper tightening mechanism 2 begins to rotate, tightening the plastic wrap 35.

[0060] like Figure 11As shown, after the cling film 35 is twisted, due to its own adhesiveness, it forms a knot. This knotted part can easily adhere to the surface of the packaged spherical fruits and vegetables without loosening, at which point it can be directly boxed or framed for transportation. Heating devices such as heating plates or hot air blowers can also be used to heat the twisted head or heat it from a distance to achieve a more aesthetically pleasing and secure result.

[0061] This application addresses the use of cling film 35 for packaging near-spherical fruits and vegetables. The method involves placing the near-spherical fruits and vegetables in the center of a pre-cut square cling film 35 of appropriate size, then gathering the cling film 35 to wrap the fruits and vegetables, and continuously tightening the cling film 35 until it completely adheres to the fruits and vegetables and is moderately stretched. At this point, the tightened cling film 35 at the rear end has become a very tight rope, especially at the contact point with the fruits and vegetables and the surrounding area, where it has been compressed and twisted into a knot. The rope-like cling film 35 at the tail end also adheres to the outside of the fruits and vegetables due to the elasticity of the twisted cling film 35 itself. When the tightening device is released, the cling film 35 will only slightly rebound, without affecting the overall packaging effect. This method enables the skin-wrapping of nearly spherical fruits and vegetables with a 35-inch plastic wrap, which has a good preservation effect. At the same time, the packaging appearance is tight and transparent with a strong visual impact. Furthermore, because the 35-inch plastic wrap is much thinner than the packaging film used in pillow packaging machines, the price of the 35-inch plastic wrap for the same area is much lower than that of the film used in pillow packaging machines, and the packaging cost is also greatly reduced.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spherical fruit and vegetable packaging drum for wrapping a spherical fruit and vegetable with a preservative film, characterized in that: This includes the frame and the multi-faceted rotary main unit, drive mechanism, and controller mounted on it; The multi-faceted rotary main unit is rotatably mounted on the frame. It includes several working surfaces with the same structure that rotate into position in sequence. Each working surface is provided with a feed port that is opened and closed by a sensor, and a gripper tightening mechanism is provided on the inner side of each feed port. Each working surface is provided with a film pressing mechanism that fixes the two sides of the plastic wrap. The clamping and tightening mechanism is located inside the multi-faceted rotary main unit and corresponds to the feed inlet. It includes a clamping component and a rotating component. The clamping component is used to clamp the falling spherical fruits and vegetables and the pressed-down plastic wrap together. The rotating component is used to control the clamping component to rotate rapidly to continuously tighten the plastic wrap into a rope shape. The drive mechanism is located on one side of the multi-faceted rotary host. The controller drives the multi-faceted rotary host to rotate and brake through the drive mechanism, so that each working surface completes the packaging work in sequence.

2. A spherical fruit and vegetable packaging drum according to claim 1, characterized in that: The multi-faceted rotary main unit includes a body and a main unit shaft. The body is a regular polyprism structure, including two end faces and several working surfaces of the same shape and size. The two main unit shafts are located at the center of the two end faces and are mounted on the frame through bearings.

3. A spherical fruit and vegetable packaging drum according to claim 2, characterized in that: One end face is engaged with the drive mechanism to drive rotation, and the other end face is equipped with a pneumatic slip ring on the frame to transmit signals from the controller; one end of the main shaft is coaxially provided with a shaft gear parallel to the end face, and the drive mechanism is located on the adjacent frame and engages with the shaft gear to drive the machine body to rotate.

4. A spherical fruit and vegetable packaging drum according to claim 3, characterized in that: The main unit's rotating shaft is equipped with two slotted photoelectric switches, namely a positioning photoelectric switch and a reset photoelectric switch. The positioning photoelectric switch is used to sense the rotational positioning state of each working surface, and it has light-blocking blades that are the same number as the working surfaces. The reset photoelectric switch has a light-blocking blade on its rotating wheel to sense the initial working surface position of the multi-faceted rotating main unit.

5. The spherical fruit and vegetable packaging drum according to claim 1, characterized in that: Each working face has a corresponding mechanical aperture device at the feed inlet. The mechanical aperture device is controlled to open and close by a controller. Below each mechanical aperture device is a corresponding clamping and tightening mechanism, which is fixedly installed inside the machine body by a bracket.

6. A spherical fruit and vegetable packaging drum according to claim 5, characterized in that: The gripper tightening mechanism includes a mounting frame and a gripping component and a rotating component mounted thereon. The gripping component includes several evenly distributed gripper bodies and a slide bar connected below them, as well as a lifting device for driving the slide bar to retract and grip. The rotating component includes a rotary motor mounted below the mounting frame, and the output end of the rotary motor is connected to the slide bar through a rotating seat.

7. A spherical fruit and vegetable packaging drum according to claim 6, characterized in that: The lifting device includes a lifting cylinder, an outer liner ring, an inner liner ring, and a liner ring bearing. There are two lifting cylinders, symmetrically arranged on the lower side of the mounting frame. The outer liner ring and the inner liner ring are connected by the liner ring bearing. The bottom surface of the outer liner ring is contacted and pushed by the lifting end of the lifting cylinder, and the outer side of the slide rod is contacted and pushed by the inner surface of the inner liner ring. The output end of the rotary motor is fixedly connected to a rotating seat. Several slide rods are connected around the rotating seat by hinges. The slide rods swing up and down in the vertical plane along the hinges.

8. A spherical fruit and vegetable packaging drum according to claim 7, characterized in that: Two feed ports are symmetrically arranged on each working surface, as well as two mechanical aperture devices corresponding to the feed ports. The two mechanical aperture devices are driven by the same mechanical aperture motor.

9. The spherical fruit and vegetable packaging drum according to claim 1, characterized in that: The film pressing mechanism includes a film pressing plate and a lifting drive component connected to it. The lifting drive component is a lifting cylinder set on the inner wall of the machine body. The film pressing plate consists of three parallel elongated pressing plates, located in the middle and on both sides of the working surface, respectively. Each film pressing plate has a hemispherical structure with rounded edges at both ends.

10. A spherical fruit and vegetable packaging drum according to any one of claims 1-9, characterized in that: The body is a hollow hexagonal prism structure with regular hexagonal end faces and six rectangular surfaces of the same size.

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