Fresh food packaging machine

Abstract

The invention discloses a fresh food packaging machine, comprising a frame, an unwinding mechanism, a tunnel-type heating device, an upper electric heating block that can be raised and lowered, and a film-wrapping conveyor belt and a film-pulling mechanism are arranged on the frame. The film-wrapping conveyor belt can be used to convey a tray containing fresh food. The unwinding mechanism comprises an unwinding device and a rotating roller, both of which are arranged on the frame, and a plurality of pricking needles are arranged on the rotating roller. The unwinding device is used to release the rolled film, and the pricking needles can pierce the film, and the film is folded to the right to form an upper half film and a lower half film. The film-pulling mechanism is used to drive the upper half film and the lower half film to move above the film-wrapping conveyor belt along the conveying direction of the film-wrapping conveyor belt. The upper electric heating block and the lower electric heating block are both L-shaped and arranged on the frame, the upper electric heating block is located in front of and to the right of the film-wrapping conveyor belt, and the lower electric heating block and the upper electric heating block are arranged correspondingly up and down. The tunnel-type heating device and the film-wrapping conveyor belt are arranged in the front-to-back direction. The packaging machine replaces manual film-wrapping, has a high speed, and is suitable for large-scale fresh film-wrapping.

Description

Technical Field

[0001] The invention relates to the field of packaging equipment, and in particular to a fresh food packaging machine. Background Art

[0002] Fresh products include fruits, vegetables and meat. With the improvement of people's living standards, the demand for fresh products has increased dramatically. In order to keep fresh products fresh, transport and sell them to consumers in a timely manner to avoid the products losing moisture and spoiling too quickly, the packaging, transportation, storage and sales of fresh products are a great challenge. In order to sell products to consumers, many products are packaged in small quantitative packages. A certain amount of products is placed in a tray, and then the products and trays are wrapped together with plastic wrap or other films. This process requires a lot of labor, and the packaging speed is slow, which cannot meet the needs of mass production. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fresh food packaging machine capable of wrapping a tray containing fresh food with film.

[0004] A fresh food packaging machine according to an embodiment of the present invention comprises a frame, an unwinding mechanism, an upper electric heating block that can be raised and lowered, a lower electric heating block that can be raised and lowered, and a tunnel-type heating device, wherein a film conveyor belt and a film pulling mechanism are provided on the frame. The film conveyor belt can be used to convey a tray containing fresh food. The unwinding mechanism comprises an unwinding mechanism and a roller, wherein the unwinding mechanism and the roller are both provided on the frame, wherein a plurality of puncture needles are provided on the roller, wherein the unwinding mechanism is used to release the rolled film, wherein the roller is used to abut against the film, wherein the puncture needles can pierce the film, and the film is folded to the right to form an upper half film and a lower half film. The film pulling mechanism is used to drive the upper half film and the lower half film to move above the film conveyor belt along the conveying direction of the film conveyor belt. The upper electric heating block is L-shaped, and is arranged on the frame and is located in front of and to the right of the film wrapping conveyor belt; the lower electric heating block is L-shaped, and is arranged on the frame, and the lower electric heating block and the upper electric heating block are arranged in correspondence with each other up and down. The tunnel-type heating device and the film wrapping conveyor belt are arranged in the front-to-back direction, and the tunnel-type heating device can be used to heat the film on the tray.

[0005] The film feeding direction is the same as the conveying direction of the film wrapping conveyor belt. The film is folded to the right along its own width direction to form an upper half film and a lower half film. Then the film is rolled into a roll, and the rolled film is placed on the unwinding. The unwinding is used to release the film. After the film passes through the roller, it is pulled by the film pulling mechanism. The film pulling mechanism drives the upper half film and the lower half film to move above the film wrapping conveyor belt along the conveying direction of the film wrapping conveyor belt. Because the roller is provided with multiple piercing needles, the piercing needles pierce multiple small holes in the upper half film and the lower half film. When the upper half film and the lower half film move above the film wrapping conveyor belt along the conveying direction of the film wrapping conveyor belt, multiple trays are placed in sequence between the upper half film and the lower half film. Under the action of gravity, the tray presses the lower half film on the film wrapping conveyor belt, and the film wrapping conveyor belt can drive the lower half film and the tray to move. Initially, the upper electric heating block is at the highest position, the lower electric heating block is at the lowest position, and the film wrapping conveyor belt is between the upper electric heating block and the lower electric heating block.

[0006] A fresh food packaging machine according to an embodiment of the present invention has at least the following beneficial effects: when the tray is between the upper half film and the lower half film and pressed on the film wrapping conveyor belt, the upper electric heating block descends and the lower electric heating block ascends, and the upper electric heating block and the lower electric heating block respectively abut the upper half film and the lower half film, and the upper electric heating block and the lower electric heating block melt the upper half film and the lower half film in the horizontal and vertical directions and heat press them together, so that the front end, the right end of the tray and the rear end of another tray are sealed by the film, and so on, and finally the trays are wrapped with film one by one. And because the upper half film and the lower half film are pierced with multiple small holes, the air wrapped in the film can be discharged through the small holes, so as to prevent the film from wrapping a large amount of air and the tray together. The tray wrapped with the film enters the tunnel heating device, and the tunnel heating device heats the film, and the film shrinks due to the heat, thereby tightly wrapping the tray. The packaging machine replaces manual film wrapping, has a fast speed, and is suitable for large quantities of fresh film wrapping.

[0007] According to some embodiments of the present invention, it also includes an upper pressure frame and a lower pressure frame that can be opened and closed, the upper pressure frame is hinged on the frame and can be covered on the front end of the film wrapping conveyor belt, the upper electric heating block is arranged on the upper pressure frame, the lower pressure frame is hinged on the frame and can be covered on the front end of the film wrapping conveyor belt, and the lower electric heating block is arranged on the lower pressure frame.

[0008] According to some embodiments of the present invention, the upper electric heating block and the lower electric heating block are connected to the upper pressing frame and the lower pressing frame respectively through a plurality of first elastic members and a plurality of second elastic members.

[0009] According to some embodiments of the present invention, a driving mechanism is further provided on the frame, and the driving mechanism is connected to the upper pressing frame and the lower pressing frame to drive the upper pressing frame and the lower pressing frame to open and close.

[0010] According to some embodiments of the present invention, the driving mechanism includes a rotating shaft arranged on the frame, a first connecting rod and a second connecting rod are provided on the rotating shaft, the first connecting rod and the second connecting rod are parallel to each other, a third connecting rod is hinged on the first connecting rod, the third connecting rod is hinged to the upper pressure frame, a fourth connecting rod is hinged on the second connecting rod, and the fourth connecting rod is hinged to the lower pressure frame.

[0011] According to some embodiments of the present invention, the driving mechanism further comprises a cylinder disposed on the frame, a fifth connecting rod is further disposed on the rotating shaft, and a piston rod of the cylinder is hinged to the fifth connecting rod.

[0012] According to some embodiments of the present invention, a feeding conveyor belt is further provided on the frame, and the feeding conveyor belt and the film wrapping conveyor belt are arranged along the front-to-back direction.

[0013] According to some embodiments of the present invention, an upper guide plate and a lower guide plate are respectively provided above and below the feeding conveyor belt, and the upper guide plate and the lower guide plate can respectively guide the upper half film and the lower half film to pass above and below the feeding conveyor belt respectively.

[0014] According to some embodiments of the present invention, the unwinding and the rotating roller are both arranged on the left side of the feeding conveyor belt and are both parallel to the conveying direction of the feeding conveyor belt, the front side surface of the upper guide plate and the front side surface of the lower guide plate form an acute angle with the conveying direction of the feeding conveyor belt, and the front side surface of the upper guide plate and the front side surface of the lower guide plate can respectively abut against the upper half film and the lower half film, so that the conveying direction of the upper half film and the lower half film is the same as the conveying direction of the feeding conveyor belt.

[0015] According to some embodiments of the present invention, the unwinding mechanism also includes a support rod, and two slide grooves are provided on the frame, the two slide grooves are parallel to each other, the slide grooves and the unwinding are in the same plane, and a third elastic member is provided in the end of the two slide grooves away from the unwinding, and the two ends of the support rod are respectively slidably installed in the two slide grooves and abut against the third elastic member.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a structural schematic diagram of a fresh food packaging machine according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional structural schematic diagram of a fresh food packaging machine is shown;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of a film wrapping conveyor belt, an upper pressing frame and a lower pressing frame of a fresh food packaging machine is shown;

[0021] Figure 4 for Figure 1 The figure shows a schematic structural diagram of a film pulling mechanism of a fresh food packaging machine.

[0022] Reference numerals:

[0023] Frame 100, film wrapping conveyor belt 110, upper pressing frame 120, first elastic member 121, lower pressing frame 130, second elastic member 131, feeding conveyor belt 140, upper guide plate 141, lower guide plate 142, slide 150, unwinding mechanism 200, unwinding 210, rotating roller 220, pricking needle 221, supporting rod 230, film pulling mechanism 300, driving wheel 310, driven wheel 320, first auxiliary wheel 330, second auxiliary wheel 340, upper electric heating block 400, lower electric heating block 500, rotating shaft 600, first connecting rod 610, third connecting rod 611, second connecting rod 620, fourth connecting rod 621, fifth connecting rod 630, cylinder 700, waste winding 800, tunnel heating device 900, conveying roller 910. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated may be based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Reference Figures 1 to 3 The present invention discloses a fresh food packaging machine, including a frame 100, a reeling mechanism 200, a tunnel heating device 900, a liftable upper electric heating block 400 and a liftable lower electric heating block 500, and a film wrapping conveyor belt 110 and a film pulling mechanism 300 are provided on the frame 100.

[0029] The film-wrapped conveyor belt 110 can be used to convey trays containing fresh food. The unwinding mechanism 200 includes an unwinding mechanism 210 and a roller 220, both of which are arranged on the frame 100. The roller 220 is provided with a plurality of piercing needles 221. The unwinding mechanism 210 is used to release the rolled film, and the roller 220 is used to press against the film. The piercing needles 221 can pierce the film, and the film is folded to the right to form an upper half film and a lower half film. The film pulling mechanism 300 is used to drive the upper half film and the lower half film to move above the film-wrapped conveyor belt 110 along the conveying direction of the film-wrapped conveyor belt 110. The upper electric heating block 400 is L-shaped, and is disposed on the frame 100 and is located in front of and to the right of the film wrapping conveyor belt 110. The lower electric heating block 500 is L-shaped, and is disposed on the frame 100, and the lower electric heating block 500 and the upper electric heating block 400 are disposed in correspondence with each other. The tunnel heating device 900 and the film wrapping conveyor belt 110 are disposed in the front-to-back direction, and the tunnel heating device 900 can be used to heat the film on the tray.

[0030] The film feeding direction is the same as the conveying direction of the film wrapping conveyor belt 110. The film is folded to the right along its own width direction to form an upper half film and a lower half film, and then the film is rolled into a roll, and the rolled film is placed on the unwinding 210. The unwinding 210 is used to release the film. After the film passes through the roller 220, it is pulled by the film pulling mechanism 300. The film pulling mechanism 300 drives the upper half film and the lower half film to move above the film wrapping conveyor belt 110 along the conveying direction of the film wrapping conveyor belt 110. Because the roller 220 is provided with a plurality of piercing needles 221, the piercing needles 221 pierce the upper half film and the lower half film with a plurality of small holes. When the upper half film and the lower half film move above the film wrapping conveyor belt 110 along the conveying direction of the film wrapping conveyor belt 110, a plurality of trays are placed in sequence between the upper half film and the lower half film. Under the action of gravity, the tray presses the lower half film on the film wrapping conveyor belt 110, and the film wrapping conveyor belt 110 can drive the lower half film and the tray to move. Initially, the upper electric heating block 400 is at the highest position, the lower electric heating block 500 is at the lowest position, and the film wrapping conveyor belt 110 is between the upper electric heating block 400 and the lower electric heating block 500 .

[0031] When the tray is between the upper film and the lower film and pressed on the film wrapping conveyor belt 110, the upper electric heating block 400 descends, the lower electric heating block 500 rises, and the upper electric heating block 400 and the lower electric heating block 500 respectively abut the upper film and the lower film, and the upper electric heating block 400 and the lower electric heating block 500 melt the upper film and the lower film in the horizontal and vertical directions and heat press them together, so that the front end, the right end of the tray and the rear end of another tray are sealed by the film, and so on, and finally the trays are wrapped with film one by one. And because the upper film and the lower film are pierced with multiple small holes, the air wrapped in the film can be discharged through the small holes, so as to prevent the film from wrapping a large amount of air and the tray together. The tray wrapped with the film enters the tunnel heating device 900, and the tunnel heating device 900 heats the film, and the film shrinks due to the heat, thereby tightly wrapping the tray. The packaging machine replaces manual film wrapping, has a fast speed, and is suitable for large quantities of fresh film wrapping.

[0032] The tunnel-type heating device 900 includes a tunnel, an electric heating pipe and a conveying roller 910. The electric heating pipe and the conveying roller 910 are arranged in the tunnel. The film-wrapping conveyor belt 110 and the conveying roller 910 are arranged in the front-to-back direction. The pallet can be transferred from the film-wrapping conveyor belt 110 to the conveying roller 910. When the pallet is transported on the conveying roller 910, the electric heating pipe generates heat and heats the film, and the film shrinks due to the heat, thereby tightly wrapping the pallet.

[0033] In some embodiments of the present invention, the packaging machine further comprises an upper pressing frame 120 and a lower pressing frame 130 which can be opened and closed, the upper pressing frame 120 is hinged on the frame 100 and can be covered on the front end of the film-wrapping conveyor belt 110, the upper electric heating block 400 is arranged on the upper pressing frame 120, the lower pressing frame 130 is hinged on the frame 100 and can be covered on the front end of the film-wrapping conveyor belt 110, and the lower electric heating block 500 is arranged on the lower pressing frame 130. When the upper pressing frame 120 and the lower pressing frame 130 are closed, the upper electric heating block 400 and the lower electric heating block 500 can abut on the left and right sides and the front of the front end of the film-wrapping conveyor belt 110, and the upper electric heating block 400 and the lower electric heating block 500 can fuse the upper half film and the lower half film in the transverse and longitudinal directions and heat-press them together. The upper pressing frame 120 and the lower pressing frame 130 are both connected to the frame 100 in a hinged manner, that is, the upper pressing frame 120 and the lower pressing frame 130 can be opened and closed by swinging.

[0034] In some embodiments of the present invention, the upper electric heating block 400 and the lower electric heating block 500 are respectively connected to the upper pressing frame 120 and the lower pressing frame 130 through a plurality of first elastic members 121 and a plurality of second elastic members 131. Both the first elastic member 121 and the second elastic member 131 have a contraction function, and the arrangement of the plurality of elastic members can enable the upper electric heating block 400 and the lower electric heating block 500 to remain horizontal when encountering external forces, and finally ensure that the upper electric heating block 400 can be closely attached to the lower electric heating block 500, thereby fusing the film and thermally fusing the upper half of the film and the lower half of the film together.

[0035] In some embodiments of the present invention, the first elastic member 121 and the second elastic member 131 may both be springs.

[0036] In some embodiments of the present invention, a driving mechanism is further provided on the frame 100, and the driving mechanism is connected to the upper pressing frame 120 and the lower pressing frame 130 to drive the upper pressing frame 120 and the lower pressing frame 130 to open and close. The driving mechanism drives the upper pressing frame 120 and the lower pressing frame 130 to rotate around the hinge point to drive the upper electric heating block 400 and the lower electric heating block 500 to move closer to or away from each other, thereby completing the sealing of the front and rear ends and the right end film of the tray. There is no need to drive the entire upper pressing frame 120 and the lower pressing frame 130 to rise and fall as a whole, so that the packaging machine has a lower power requirement for the driving mechanism.

[0037] It can be understood that the upper pressing frame 120 and the lower pressing frame 130 can be symmetrically arranged with the upper surface of the film conveyor belt 110 as the symmetry plane. When the upper pressing frame 120 and the lower pressing frame 130 are put together, the intersection of the upper pressing frame 120 and the lower pressing frame 130 is flush with the upper surface of the film conveyor belt 110.

[0038] In some embodiments of the present invention, the upper pressing frame 120 includes a horizontal plate and a left plate and a right plate arranged at both ends of the horizontal plate, the left plate and the right plate are both perpendicular to the horizontal plate, the end of the left plate away from the horizontal plate and the end of the right plate away from the horizontal plate are both hinged to the frame 100, the left plate and the right plate can be located on the left and right of the film conveyor belt 110 respectively, the horizontal plate can be moved to the front of the film conveyor belt 110, and the upper electric heating block 400 is arranged on the horizontal plate and the right plate. When the upper pressing frame 120 rotates so that the free end of the upper pressing frame 120 moves downward, that is, when the horizontal plate moves downward, the left plate, the right plate and the horizontal plate are located on the left, right and front of the film conveyor belt 110 respectively, that is, the upper pressing frame 120 can cover the front end of the film conveyor belt 110. The upper pressing frame 120 has a symmetrical structure, so that its own force is balanced and the structural strength is large. Similarly, the lower pressing frame 130 can adopt a structural solution that is the same or similar to the upper pressing frame 120.

[0039] It can also be understood that the upper pressing frame 120 and the lower pressing frame 130 are both U-shaped, the open end of the upper pressing frame 120 is hinged to the frame 100, and the open end of the lower pressing frame 130 is also hinged to the frame 100. The upper pressing frame 120 and the lower pressing frame 130 can be covered with the front end of the film wrapping conveyor belt 110. When the upper half of the film and the lower half of the film clamp the pallet onto the film wrapping conveyor belt 110, it is beneficial for the upper pressing frame 120 and the lower pressing frame 130 to be immediately closed, thereby completing the film wrapping of the pallet.

[0040] In some embodiments of the present invention, the driving mechanism includes a rotating shaft 600 arranged on the frame 100, and a first connecting rod 610 and a second connecting rod 620 are provided on the rotating shaft 600. The first connecting rod 610 and the second connecting rod 620 are parallel to each other. A third connecting rod 611 is hinged on the first connecting rod 610, and the third connecting rod 611 is hinged to the upper pressure frame 120. A fourth connecting rod 621 is hinged on the second connecting rod 620, and the fourth connecting rod 621 is hinged to the lower pressure frame 130.

[0041] When the rotating shaft 600 rotates, the first connecting rod 610 and the second connecting rod 620 are driven to rotate. The first connecting rod 610 and the second connecting rod 620 drive the upper pressing frame 120 and the lower pressing frame 130 to rotate respectively through the third connecting rod 611 and the fourth connecting rod 621. Since the first connecting rod 610 and the second connecting rod 620 are parallel to each other, the upper pressing frame 120 and the lower pressing frame 130 rotate in opposite directions, that is, the upper pressing frame 120 and the lower pressing frame 130 are opened or closed.

[0042] In some embodiments of the present invention, the driving mechanism further comprises a cylinder 700 disposed on the frame 100, and a fifth connecting rod 630 is further disposed on the rotating shaft 600, and the piston rod of the cylinder 700 is hinged to the fifth connecting rod 630. The cylinder 700 can drive the rotating shaft 600 to rotate back and forth around its own central axis through the fifth connecting rod 630. The cylinder 700 itself drives reciprocating or back and forth motion, and is most suitable for use here.

[0043] Specifically, two of each of the first connecting rod 610, the second connecting rod 620, the third connecting rod 611 and the fourth connecting rod 621 are provided. One first connecting rod 610, one second connecting rod 620, one third connecting rod 611 and one fourth connecting rod 621 are located on the left side of the lower pressing frame 130; another first connecting rod 610, another second connecting rod 620, another third connecting rod 611 and another fourth connecting rod 621 are located on the right side of the lower pressing frame 130. Such an arrangement can balance the forces on the left and right sides of the upper pressing frame 120 and the lower pressing frame 130, avoid deformation of the upper pressing frame 120 and the lower pressing frame 130, and extend the service life of the upper pressing frame 120 and the lower pressing frame 130.

[0044] In some embodiments of the present invention, a feeding conveyor belt 140 is further provided on the frame 100, and the feeding conveyor belt 140 and the film-wrapping conveyor belt 110 are arranged in the front-rear direction. A tray containing fresh food can be directly placed on the feeding conveyor belt 140, and then the tray is placed between the upper half film and the lower half film through the feeding conveyor belt 140 and falls on the film-wrapping conveyor belt 110, and the feeding conveyor belt 140 can facilitate the placement of the tray.

[0045] In some embodiments of the present invention, an upper guide plate 141 and a lower guide plate 142 are respectively provided above and below the feeding conveyor belt 140, and the upper guide plate 141 and the lower guide plate 142 can respectively guide the upper half film and the lower half film to pass through the upper and lower parts of the feeding conveyor belt 140. The upper half film and the lower half film are like wrapping the feeding conveyor belt 140 from top to bottom, that is, the upper half film and the lower half film wrap the pallet from top to bottom, so that the pallet is sandwiched between the upper half film and the lower half film when it is transferred to the film wrapping conveyor belt 110.

[0046] In some embodiments of the present invention, the unwinding 210 and the rotating roller 220 are both arranged on the left side of the feeding conveyor belt 140 and are both parallel to the conveying direction of the feeding conveyor belt 140. The front side surface of the upper guide plate 141 and the front side surface of the lower guide plate 142 form an acute angle with the conveying direction of the feeding conveyor belt 140. The front side surface of the upper guide plate 141 and the front side surface of the lower guide plate 142 can respectively abut against the upper half film and the lower half film, so that the conveying direction of the upper half film and the lower half film is the same as the conveying direction of the feeding conveyor belt 140.

[0047] The upper half film and the lower half film pass through the upper and lower parts of the feeding conveyor belt 140 respectively. When the pallet is placed on the feeding conveyor belt 140, the pallet is already between the upper half film and the lower half film. Because the front side of the upper guide plate 141 and the front side of the lower guide plate 142 form an acute angle with the conveying direction of the feeding conveyor belt 140, that is to say, the front of the front side of the upper guide plate 141 is an open area, and the pallet can be conveniently and directly placed in this open area. Because the film is folded in half to form the upper half film and the lower half film, the connection between the upper half film and the lower half film is a sealing area. Because the unwinding 210 and the rotating roller 220 are both arranged on the left side of the feeding conveyor belt 140, the sealing area of ​​the film released by the unwinding 210 is facing the front of the feeding conveyor belt 140. Furthermore, because the front side surface of the upper guide plate 141 and the front side surface of the lower guide plate 142 form an acute angle with the conveying direction of the feeding conveyor belt 140, the inner and outer sides of the upper half of the film are swapped in the area of ​​the upper guide plate 141 to change the conveying direction of the upper half of the film, and the inner and outer sides of the lower half of the film are swapped in the area of ​​the lower guide plate 142 to change the conveying direction of the upper half of the film.

[0048] In some embodiments of the present invention, the unwinding mechanism 200 also includes a support rod 230, and two slide grooves 150 are provided on the frame 100. The two slide grooves 150 are parallel to each other, and the slide grooves 150 and the unwinding 210 are in the same plane. A third elastic member is provided in one end of the two slide grooves 150 away from the unwinding 210, and the two ends of the support rod 230 are respectively slidably installed in the two slide grooves 150 and abut against the third elastic member.

[0049] Because the chute 150 and the unwinding 210 are in the same plane, that is, the length direction of the chute 150 is perpendicular to the length direction of the unwinding 210, the third elastic member pushes the support rod 230 toward the unwinding 210. When the rolled film is placed on the unwinding 210, the third elastic member drives the support rod 230 to press on the rolled film, so that the film is compressed, thereby creating resistance to the release of the film, so that the released film remains in a tensioned state. The third elastic member can be a spring.

[0050] See also Figure 4 The film pulling mechanism 300 includes a motor and a driven wheel 320 disposed on the frame 100. The motor is provided with a driving wheel 310 matched with the driven wheel 320. The driving wheel 310 and the driven wheel 320 are located on the right side of the film wrapping conveyor belt 110 and can clamp and drive the upper half film and the lower half film at the same time. The motor drives the driving wheel 310 and the driven wheel 320 to rotate, thereby driving the upper half film and the lower half film to move along the conveying direction of the film wrapping conveyor belt 110.

[0051] When the upper electric heating block 400 and the lower electric heating block 500 longitudinally melt the upper half film and the lower half film and heat-press them together, the upper half film and the lower half film are melted, and the part of the upper half film and the lower half film that does not wrap the pallet is waste film, and the driving wheel 310 and the driven wheel 320 can clamp and pull the waste film.

[0052] It can be understood that the film pulling mechanism 300 also includes a first auxiliary wheel 330 and a second auxiliary wheel 340 arranged on the frame 100, a first belt is wound around the driving wheel 310 and the first auxiliary wheel 330, and a second belt is wound around the driven wheel 320 and the second auxiliary wheel 340. The first belt and the second belt abut against and can clamp the upper half of the film and the lower half of the film. The rotation of the first belt and the second belt can pull the film to move along the conveying direction of the film wrapping conveyor belt 110.

[0053] In some embodiments of the present invention, a waste reel 800 is provided on the frame 100, and the waste reel 800 can be used to store waste film. The waste reel 800 rolls up the waste film to prevent the waste film from occupying too much workshop space, and facilitates the collection and unified treatment of the waste film.

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A fresh food packaging machine, characterized in that: include: A frame (100), wherein a film-wrapped conveyor belt (110) is provided on the frame (100), and the film-wrapped conveyor belt (110) can be used to convey a tray containing fresh produce; An unwinding mechanism (200), the unwinding mechanism (200) comprising an unwinding device (210) and a rotating roller (220), the unwinding device (210) and the rotating roller (220) both being arranged on the frame (100), the rotating roller (220) being provided with a plurality of piercing needles (221), the unwinding device (210) being used to release a rolled film, the film being folded to the right to form an upper half film and a lower half film, the rotating roller (220) being used to abut against the film, and the piercing needles (221) being capable of piercing through the film; a film-pulling mechanism (300), the film-pulling mechanism (300) being arranged on the frame (100), the film-pulling mechanism (300) being used to drive the upper half film and the lower half film to move above the film-wrapping conveyor belt (110) along the conveying direction of the film-wrapping conveyor belt (110); an upper electric heating block (400) that can be raised or lowered, the upper electric heating block (400) being L-shaped, the upper electric heating block (400) being arranged on the frame (100) and being located in front of and to the right of the film wrapping conveyor belt (110); A lower electric heating block (500) that can be raised and lowered, the lower electric heating block (500) being L-shaped, the lower electric heating block (500) being arranged on the frame (100), and the lower electric heating block (500) and the upper electric heating block (400) being arranged correspondingly up and down; a tunnel-type heating device (900), wherein the tunnel-type heating device (900) and the film wrapping conveyor belt (110) are arranged along a front-to-back direction, and the tunnel-type heating device (900) can be used to heat the film on the tray; an upper pressing frame (120) and a lower pressing frame (130) that can be opened and closed, the upper pressing frame (120) being hinged on the frame (100) and being coverable on the front end of the film-wrapping conveyor belt (110), the upper electric heating block (400) being arranged on the upper pressing frame (120), the lower pressing frame (130) being hinged on the frame (100) and being coverable on the front end of the film-wrapping conveyor belt (110), and the lower electric heating block (500) being arranged on the lower pressing frame (130); A driving mechanism, the driving mechanism being connected to the upper pressing frame (120) and the lower pressing frame (130) to drive the upper pressing frame (120) and the lower pressing frame (130) to open and close; The driving mechanism comprises a rotating shaft (600) arranged on the frame (100), a first connecting rod (610) and a second connecting rod (620) being arranged on the rotating shaft (600), the first connecting rod (610) and the second connecting rod (620) being parallel to each other, a third connecting rod (611) being hingedly connected to the first connecting rod (610), the third connecting rod (611) being hingedly connected to the upper pressing frame (120), a fourth connecting rod (621) being hingedly connected to the second connecting rod (620), the fourth connecting rod (621) being hingedly connected to the lower pressing frame (130); A feeding conveyor belt (140) is also provided on the frame (100). The feeding conveyor belt (140) and the film wrapping conveyor belt (110) are arranged in the front-to-back direction. An upper guide plate (141) and a lower guide plate (142) are respectively provided above and below the feeding conveyor belt (140). The upper guide plate (141) and the lower guide plate (142) can respectively guide the upper half film and the lower half film to pass through the upper and lower parts of the feeding conveyor belt (140). The unwinding device (210) and the rotating roller (220) are both arranged on the left side of the feeding conveyor belt (140) and are both parallel to the conveying direction of the feeding conveyor belt (140). The front side surface of the upper guide plate (141) and the front side surface of the lower guide plate (142) form an acute angle with the conveying direction of the feeding conveyor belt (140). The front side surface of the upper guide plate (141) and the front side surface of the lower guide plate (142) can respectively abut against the upper half film and the lower half film, so that the conveying direction of the upper half film and the lower half film is the same as the conveying direction of the feeding conveyor belt (140).

2. A fresh food packaging machine according to claim 1, characterized in that: The upper electric heating block (400) and the lower electric heating block (500) are respectively connected to the upper pressing frame (120) and the lower pressing frame (130) via a plurality of first elastic members (121) and a plurality of second elastic members (131).

3. A fresh food packaging machine according to claim 1, characterized in that: The driving mechanism further comprises a cylinder (700) arranged on the frame (100), a fifth connecting rod (630) is further arranged on the rotating shaft (600), and a piston rod of the cylinder (700) and the fifth connecting rod (630) are hingedly connected.

4. A fresh food packaging machine according to claim 1, characterized in that: The unwinding mechanism (200) further comprises a support rod (230), the frame (100) is provided with two slide grooves (150), the two slide grooves (150) are parallel to each other, the slide grooves (150) and the unwinding (210) are in the same plane, a third elastic member is provided in one end of the two slide grooves (150) away from the unwinding (210), and the two ends of the support rod (230) are respectively slidably installed in the two slide grooves (150) and abut against the third elastic member.

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