Vegetable and fruit packaging equipment

Abstract

The utility model relates to the technical field of vegetable and fruit packaging, in particular to vegetable and fruit packaging equipment which comprises a base, a machine frame is fixed to one side of the surface of the base, a containing disc is arranged below the machine frame, four containing grooves are formed in the surface of the containing disc in the circumferential direction, and a film feeding mechanism is arranged on the surface of the machine frame. A film roll, a film guide roller, a driving motor and a rotating rod are arranged in the film feeding mechanism, a packaging mechanism is arranged in the rack, a packaging assembly, a telescopic rod and an electric push rod are arranged in the packaging mechanism, and a stepping rotating mechanism is arranged at the bottom of the containing groove; the stepping rotating mechanism is composed of a stepping rotating component and a stepping motor, and dismounting mechanisms are arranged on the two sides of the base. The packaging device is simple in structure and easy to process in the early stage, the labor intensity of workers when the packaging device is used is reduced, and the convenience degree of the packaging device when the film roll is disassembled and assembled is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vegetable and fruit packaging, in particular to vegetable and fruit packaging equipment. Background Art

[0002] With the improvement of people's living standards and the acceleration of the pace of life, the demand for clean vegetables will become greater and greater. Therefore, vegetable, fruit and melon packaging equipment is widely used in the production of clean vegetables in various large supermarkets. Vegetable, fruit and melon packaging equipment generally packages by hot-pressing the packaging film on the surface of the vegetable and fruit packaging box.

[0003] The packaging equipment generally first covers the packaging film on the surface of the vegetable and fruit packaging box, and then seals the packaging box through the sealing structure and the shearing structure. The structure is relatively complicated. When the packaging equipment is in use, the packaging boxes containing vegetables and fruits are generally transported by a conveyor belt. When in use, at least two workers are required to stand at both ends of the conveyor belt to load and unload the materials, which is relatively laborious and easily leads to high labor intensity for the workers when the packaging equipment is used. When in use, the packaging equipment generally uses multiple screws to disassemble and assemble the packaging film roll, which is relatively cumbersome, thereby reducing the convenience of the packaging equipment when disassembling and assembling the film roll. Utility Model Content

[0004] The utility model aims to provide a vegetable and fruit packaging device to solve the problems in the above-mentioned background technology that the packaging device has a complex structure when in use, has a high labor intensity for the staff, and is inconvenient when disassembling and assembling the film roll.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a vegetable and fruit packaging device, comprising a base, a control row of keys are installed on the surface of the base, a frame is fixed on one side of the base surface, a placement plate is arranged below the frame, four placement grooves are opened on the surface of the placement plate along the circumferential direction, a film feeding mechanism is arranged on the surface of the frame, the interior of the film feeding mechanism includes a film roll, a film guide roller, a driving motor and a rotating rod, a packaging mechanism is arranged inside the frame, the interior of the packaging mechanism includes a packaging assembly, a telescopic rod and an electric push rod, a stepping rotating mechanism is arranged at the bottom of the placement groove, the stepping rotating mechanism is composed of a stepping rotating component and a stepping motor, and disassembly and assembly mechanisms are arranged on both sides of the base, and the disassembly and assembly mechanism is composed of a fixed column and a disassembly and assembly component.

[0006] Preferably, both sides inside the frame are rotatably connected to the film guide roller, and drive motors are installed on both sides of the top position of the frame. The input end of the drive motor is electrically connected to the output end of the control row key, and the output end of the drive motor is fixed with a rotating rod through a coupling, and the surface of the rotating rod is provided with a film roll.

[0007] Preferably, an electric push rod is installed inside the frame, the input end of the electric push rod is electrically connected to the output end of the control row key, telescopic rods are fixed on both sides of the frame, and a packaging component is arranged below the telescopic rods.

[0008] Preferably, the packaging assembly consists of a pressing plate, a cutting knife, a heating wire and a connecting frame, a pressing plate is arranged above the placement groove, the surface of the pressing plate is fixedly connected to one end of the telescopic rod and the electric push rod respectively, and a cutting knife is fixed to the bottom of the pressing plate.

[0009] Preferably, a cutting knife is fixed at the edge of the bottom of the pressure plate, the structure of the cutting knife is a circular structure, a heating wire is installed on the surface of the cutting knife, and the input end of the heating wire is electrically connected to the output end of the control row key.

[0010] Preferably, a stepping rotating component is installed at the bottom of the placement groove, and the stepping rotating component is driven by a stepping motor, and the input end of the stepping motor is electrically connected to the output end of the control keypad.

[0011] Preferably, the interior of the stepping rotating component includes a pushing block, a fan-shaped plate, a turntable, an arc-shaped groove and a U-shaped groove. The output end of the stepping motor is fixed with a rotating shaft through a coupling. The surface of the rotating shaft is fixed with a pushing block. A fan-shaped plate is arranged above the pushing block, and the fan-shaped plate is fixedly connected to the surface of the rotating shaft.

[0012] Preferably, a turntable is fixed at the bottom of the placement groove, and four arc-shaped grooves are opened circumferentially at the edge of the turntable. The arc-shaped grooves cooperate with the fan-shaped plates, and U-shaped grooves are arranged between the arc-shaped grooves. The U-shaped grooves are opened on the surface of the turntable, and the U-shaped grooves cooperate with the pushing blocks.

[0013] Preferably, the fixing column is sleeved on the surface of the rotating rod, the fixing column is in contact with the inner wall of the film roll, and disassembly components are provided on both sides of the fixing column.

[0014] Preferably, the interior of the disassembling and assembling component includes a fastening stud, a movable limiting cone and a fixed limiting cone, one end of the rotating rod is sleeved with a movable limiting cone, the surface of the movable limiting cone is tightly fitted with the surface of the film roll, the surface of the movable limiting cone is threadedly connected with a fastening stud, one end of the fastening stud passes through the movable limiting cone and is threadedly fastened with the surface of the rotating rod, a fixed limiting cone is provided on one side of the movable limiting cone, the surface of the fixed limiting cone is fixedly connected to the surface of the rotating rod, and the surface of the fixed limiting cone is tightly fitted with the surface of the film roll.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the vegetable and fruit packaging equipment is not only simple in structure and easy to process in the early stage, but also reduces the labor intensity of the staff when using the packaging equipment, and improves the convenience of disassembling and assembling the film roll of the packaging equipment;

[0016] By providing a packaging mechanism, when the placing plate drives the packaging box to rotate to the bottom of the pressing plate, the control row of keys can be operated to control the electric heating wire and the electric push rod to work, and the electric push rod drives the pressing plate to move downward to press the packaging film to the surface of the packaging box. At this time, the electric heating wire is in close contact with the packaging film to perform hot pressing and fix the packaging film. At the same time, the packaged film block can be cut under the action of the cutting knife to realize the hot pressing packaging function of the packaging equipment. The structure is simple and easy for early processing.

[0017] By providing a stepping rotating mechanism, the packaging box containing vegetables, fruits and melons is placed inside the placement slot, and then the control row of keys is operated to control the stepping motor to work. Under the action of the stepping motor, the pushing block and the fan-shaped plate are driven to rotate. Under the cooperation of the pushing block and the U-shaped slot, the fan-shaped plate and the arc-shaped slot, the turntable is stepped and rotated 90 degrees, so that the packaging box moves to the bottom of the pressing plate for packaging. At the same time, the staff can put the next packaging box to be packaged into the other placement slots. After one of the packaging boxes is packaged, the placement slot can be stepped and rotated under the action of the stepping rotating mechanism, which is convenient for the staff to directly take out the packaged packaging box and put in a new one, so as to realize the labor-saving pick-up and place function of the packaging equipment, thereby reducing the labor intensity of the staff when the packaging equipment is used;

[0018] By providing a disassembly and assembly mechanism, the film roll is put on the surface of the rotating rod, and the inside of the film roll can be supported under the action of the fixed column, and then the film roll is pushed so that one end of the film roll is in close contact with the fixed limiting cone, and then the movable limiting cone is put on one end of the rotating rod, and then the movable limiting cone is pushed so that the movable limiting cone is in close contact with the other end of the film roll, and then the fastening stud is tightened to fix the movable limiting cone, and under the action of the movable limiting cone and the fixed limiting cone, the film roll is quickly clamped and fixed, and the film roll to be discharged is fixed on the surface of the rotating rod, and the film roll of the residual material to be wound up is placed on the surface of the rotating rod on the other side, so as to realize the function of facilitating the disassembly and assembly of the film roll of the packaging equipment, thereby improving the convenience of the packaging equipment when disassembling and assembling the film roll. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the enlarged structure of the stepping rotating mechanism of the utility model from top view;

[0022] Figure 4 It is a schematic diagram of an enlarged side cross-sectional structure of the pick-and-place mechanism of the utility model.

[0023] In the figure: 1, base; 101, control row key; 102, frame; 103, placement plate; 104, placement slot; 2, film feeding mechanism; 201, film roll; 202, film guide roller; 203, drive motor; 204, rotating rod; 3, packaging mechanism; 301, packaging component; 3011, pressing plate; 3012, cutting knife; 3013, heating wire; 3014, connecting frame; 302, telescopic rod; 303, electric push rod; 4, stepping and rotating mechanism; 401, stepping and rotating component; 4011, pushing block; 4012, fan-shaped plate; 4013, turntable; 4014, arc-shaped groove; 4015, U-shaped groove; 402, stepping motor; 5, disassembly and assembly mechanism; 501, fixing column; 502, disassembly and assembly component; 5021, fastening stud; 5022, movable limit cone; 5023, fixed limit cone. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] The utility model provides a vegetable and fruit packaging device with a structure as follows Figure 1 and Figure 2 As shown, it includes a base 1, a control row of keys 101 is installed on the surface of the base 1, a frame 102 is fixed to one side of the surface of the base 1, a placement plate 103 is arranged below the frame 102, and four placement grooves 104 are opened on the surface of the placement plate 103 along the circumferential direction.

[0026] Furthermore, if Figure 2 and Figure 4As shown, a film feeding mechanism 2 is provided on the surface of the frame 102, and the interior of the film feeding mechanism 2 includes a film roll 201, a film guide roller 202, a driving motor 203 and a rotating rod 204. Both sides of the interior of the frame 102 are rotatably connected to the film guide roller 202, and driving motors 203 are installed on both sides of the top position of the frame 102. The input end of the driving motor 203 is electrically connected to the output end of the control row key 101, and the output end of the driving motor 203 is fixed to the rotating rod 204 through a coupling, and the surface of the rotating rod 204 is sleeved with a film roll 201.

[0027] Furthermore, if Figure 2 As shown, the packaging mechanism 3 is arranged inside the frame 102, and the packaging mechanism 3 includes a packaging assembly 301, a telescopic rod 302 and an electric push rod 303. The electric push rod 303 is installed inside the frame 102, and the input end of the electric push rod 303 is electrically connected to the output end of the control row key 101. The telescopic rod 302 is fixed on both sides of the frame 102, and the packaging assembly 301 is arranged below the telescopic rod 302. The packaging assembly 301 consists of a pressing plate 3011, a cutting knife 3012, a heating wire 3013 and The connecting frame 3014 is composed of a pressure plate 3011 arranged above the placement slot 104, the surfaces of the pressure plate 3011 are fixedly connected to one end of the telescopic rod 302 and the electric push rod 303 respectively, a cutting knife 3012 is fixed to the bottom of the pressure plate 3011, and the cutting knife 3012 is fixed at the edge of the bottom of the pressure plate 3011. The structure of the cutting knife 3012 is a circular structure, and a heating wire 3013 is installed on the surface of the cutting knife 3012, and the input end of the heating wire 3013 is electrically connected to the output end of the control row key 101.

[0028] During use, when the placement plate 103 drives the packaging box to rotate to the bottom of the pressure plate 3011, the control row of keys 101 can be operated to make the control row of keys 101 control the heating wire 3013 and the electric push rod 303 to work, and the pressure plate 3011 is driven downward by the action of the electric push rod 303 to press the packaging film to the surface of the packaging box. At this time, the heating wire 3013 is in close contact with the packaging film, and the packaging film is hot-pressed and fixed. At the same time, the packaged film block can be cut under the action of the cutting knife 3012 to realize the hot pressing packaging function of the packaging equipment.

[0029] Furthermore, if Figure 2 and Figure 3As shown, a stepping rotating mechanism 4 is provided at the bottom of the placement slot 104, and the stepping rotating mechanism 4 is composed of a stepping rotating component 401 and a stepping motor 402. The stepping rotating component 401 is installed at the bottom of the placement slot 104, and the stepping rotating component 401 is driven by the stepping motor 402. The input end of the stepping motor 402 is electrically connected to the output end of the control row key 101. The interior of the stepping rotating component 401 includes a pushing block 4011, a fan-shaped plate 4012, a rotating disk 4013, an arc-shaped slot 4014 and a U-shaped slot 4015. The output end of the stepping motor 402 is electrically connected to the output end of the control row key 101. A rotating shaft is fixed to the coupling, a pushing block 4011 is fixed to the surface of the rotating shaft, a fan-shaped plate 4012 is arranged above the pushing block 4011, the fan-shaped plate 4012 is fixedly connected to the surface of the rotating shaft, a turntable 4013 is fixed to the bottom of the placement slot 104, four arc-shaped grooves 4014 are opened along the circumferential direction at the edge of the turntable 4013, the arc-shaped grooves 4014 cooperate with the fan-shaped plate 4012, U-shaped grooves 4015 are arranged between the arc-shaped grooves 4014, the U-shaped grooves 4015 are opened on the surface of the turntable 4013, and the U-shaped grooves 4015 cooperate with the pushing block 4011.

[0030] When in use, place the packaging box containing vegetables, fruits and melons into the placement slot 104, then operate the control row of keys 101 to control the stepping motor 402 to work, and under the action of the stepping motor 402, drive the pushing block 4011 and the fan-shaped plate 4012 to rotate, and under the cooperation of the pushing block 4011 and the U-shaped slot 4015, the fan-shaped plate 4012 and the arc-shaped slot 4014, the turntable 4013 is rotated ninety degrees in steps, so that the packaging box moves to the bottom of the pressing plate 3011 for packaging. At the same time, the staff can put the next packaging box to be packaged into the other placement slots 104. After one of the packaging boxes is packaged, the placement slot 104 can be rotated in steps under the action of the stepping rotating mechanism 4, which is convenient for the staff to directly remove the packaged packaging box and put in a new one, so as to realize the labor-saving pick-up and placement function of the packaging equipment.

[0031] Furthermore, if Figure 4As shown, both sides of the base 1 are provided with a disassembly mechanism 5, which is composed of a fixed column 501 and a disassembly component 502. The fixed column 501 is sleeved on the surface of the rotating rod 204, and the fixed column 501 is in contact with the inner wall of the film roll 201. The disassembly component 502 is provided on both sides of the fixed column 501. The interior of the disassembly component 502 includes a fastening stud 5021, a movable limiting cone 5022 and a fixed limiting cone 5023. One end of the rotating rod 204 is sleeved with a movable limiting cone 5022. The surface of the limiting cone 5022 fits tightly with the surface of the film roll 201, and the surface of the movable limiting cone 5022 is threadedly connected with a fastening stud 5021, one end of the fastening stud 5021 passes through the movable limiting cone 5022 and is threadedly fastened with the surface of the rotating rod 204, and a fixed limiting cone 5023 is provided on one side of the movable limiting cone 5022, and the surface of the fixed limiting cone 5023 is fixedly connected to the surface of the rotating rod 204, and the surface of the fixed limiting cone 5023 fits tightly with the surface of the film roll 201.

[0032] When in use, the film roll 201 is put onto the surface of the rotating rod 204, and the inside of the film roll 201 can be supported under the action of the fixed column 501, and then the film roll 201 is pushed so that one end of the film roll 201 is tightly attached to the fixed limiting cone 5023, and then the movable limiting cone 5022 is put onto one end of the rotating rod 204, and then the movable limiting cone 5022 is pushed so that the movable limiting cone 5022 is tightly attached to the other end of the film roll 201, and then the fastening stud 5021 is tightened to fix the movable limiting cone 5022, and under the action of the movable limiting cone 5022 and the fixed limiting cone 5023, the film roll 201 is quickly clamped and fixed, and the film roll 201 to be discharged is fixed on the surface of the rotating rod 204, and the film roll 201 with the residual material to be wound up is placed on the surface of the rotating rod 204 on the other side, so as to realize the function of facilitating the disassembly and assembly of the film roll 201 of the packaging equipment.

[0033] The film roll 201 is quickly clamped and fixed under the action of the movable limiting cone 5022 and the fixed limiting cone 5023, and the film roll 201 to be discharged is fixed on the surface of the rotating rod 204, and the film roll 201 with the residual material to be wound is placed on the surface of the rotating rod 204 on the other side, so as to realize the function of facilitating the disassembly and assembly of the film roll 201 of the packaging equipment, thereby improving the convenience of disassembly and assembly of the film roll 201 of the packaging equipment.

[0034] Then, the packaging box containing vegetables, fruits and melons is placed inside the placement groove 104, and then the control row key 101 is operated to make the control row key 101 control the stepping motor 402 to work. Under the action of the stepping motor 402, the pushing block 4011 and the fan-shaped plate 4012 are driven to rotate. Under the cooperation of the pushing block 4011 and the U-shaped groove 4015, the fan-shaped plate 4012 and the arc groove 4014, the turntable 4013 is rotated ninety degrees in steps, so that the packaging box moves to the bottom of the pressing plate 3011 for packaging. At the same time, the staff can put the next packaging box to be packaged into the other placement grooves 104. After one of the packaging boxes is packaged, the placement groove 104 can be rotated in steps under the action of the stepping rotating mechanism 4, so that the staff can directly take out the packaged packaging box and put in a new one, so as to realize the labor-saving pick-up and place function of the packaging equipment, thereby reducing the labor intensity of the staff when using the packaging equipment.

[0035] When the placement plate 103 drives the packaging box to rotate to the bottom of the pressure plate 3011, the control row of keys 101 can be operated to control the heating wire 3013 and the electric push rod 303 to work. Under the action of the electric push rod 303, the pressure plate 3011 is driven to move downward to press the packaging film to the surface of the packaging box. At this time, the heating wire 3013 is in close contact with the packaging film, and the packaging film is hot-pressed and fixed. At the same time, the packaged film block can be cut under the action of the cutting knife 3012 to realize the hot-pressing packaging function of the packaging equipment. The structure is simple and easy to process in the early stage.

[0036] At the same time, the control row of keys 101 can be operated to control the driving motor 203 to work, so that the driving motor 203 drives the rotating rod 204 to rotate, and drives the film roll 201 to rotate. The film roll 201 on one side is used for feeding, and the film roll 201 on the other side can be used to reel in the remaining residual material, thereby completing the use of the packaging equipment.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A vegetable and fruit packaging device, comprising a base (1), characterized in that: A control row of keys (101) is installed on the surface of the base (1); a frame (102) is fixed on one side of the surface of the base (1); a placement plate (103) is arranged below the frame (102); four placement grooves (104) are opened on the surface of the placement plate (103) along the circumferential direction; a film feeding mechanism (2) is arranged on the surface of the frame (102); the film feeding mechanism (2) includes a film roll (201), a film guide roller (202), a drive motor (203) and a rotating rod (204); the frame A packaging mechanism (3) is arranged inside the (102), and the packaging mechanism (3) contains a packaging component (301), a telescopic rod (302) and an electric push rod (303). A stepping rotating mechanism (4) is arranged at the bottom of the placement groove (104), and the stepping rotating mechanism (4) is composed of a stepping rotating component (401) and a stepping motor (402). Both sides of the base (1) are provided with a disassembly mechanism (5), and the disassembly mechanism (5) is composed of a fixed column (501) and a disassembly component (502).

2. The vegetable and fruit packaging equipment according to claim 1 is characterized by: Both sides of the frame (102) are rotatably connected to the film guide roller (202), and both sides of the top of the frame (102) are installed with drive motors (203), the input end of the drive motor (203) is electrically connected to the output end of the control row key (101), and the output end of the drive motor (203) is fixed with a rotating rod (204) through a coupling, and the surface of the rotating rod (204) is provided with a film roll (201).

3. The vegetable and fruit packaging equipment according to claim 1 is characterized by: An electric push rod (303) is installed inside the frame (102), and an input end of the electric push rod (303) is electrically connected to an output end of the control row key (101). Telescopic rods (302) are fixed on both sides inside the frame (102), and a packaging component (301) is arranged below the telescopic rods (302).

4. The vegetable and fruit packaging equipment according to claim 3 is characterized by: The packaging assembly (301) is composed of a pressing plate (3011), a cutting knife (3012), a heating wire (3013) and a connecting frame (3014); a pressing plate (3011) is arranged above the placement slot (104); the surface of the pressing plate (3011) is fixedly connected to one end of the telescopic rod (302) and the electric push rod (303), respectively; and a cutting knife (3012) is fixed to the bottom of the pressing plate (3011).

5. The vegetable and fruit packaging equipment according to claim 4 is characterized by: A cutting knife (3012) is fixed at the edge of the bottom of the pressing plate (3011); the structure of the cutting knife (3012) is a circular structure; a heating wire (3013) is installed on the surface of the cutting knife (3012); the input end of the heating wire (3013) is electrically connected to the output end of the control row key (101).

6. The vegetable and fruit packaging equipment according to claim 1 is characterized by: A stepping rotating component (401) is installed at the bottom of the placement groove (104), and the stepping rotating component (401) is driven by a stepping motor (402). The input end of the stepping motor (402) is electrically connected to the output end of the control keypad (101).

7. The vegetable and fruit packaging equipment according to claim 6 is characterized by: The stepping rotating component (401) comprises a pushing block (4011), a fan-shaped plate (4012), a rotating disk (4013), an arc-shaped groove (4014) and a U-shaped groove (4015) inside; the output end of the stepping motor (402) is fixed with a rotating shaft via a coupling; the pushing block (4011) is fixed on the surface of the rotating shaft; a fan-shaped plate (4012) is arranged above the pushing block (4011); and the fan-shaped plate (4012) is fixedly connected to the surface of the rotating shaft.

8. The vegetable and fruit packaging equipment according to claim 7 is characterized by: A rotating disk (4013) is fixed at the bottom of the placement groove (104); four arc-shaped grooves (4014) are opened along the circumferential direction at the edge of the rotating disk (4013); the arc-shaped grooves (4014) cooperate with the fan-shaped plate (4012); U-shaped grooves (4015) are arranged between the arc-shaped grooves (4014); the U-shaped grooves (4015) are opened on the surface of the rotating disk (4013); and the U-shaped grooves (4015) cooperate with the pushing block (4011).

9. The vegetable and fruit packaging equipment according to claim 1, characterized in that: The fixed column (501) is sleeved on the surface of the rotating rod (204), the fixed column (501) is in contact with the inner wall of the film roll (201), and disassembly components (502) are provided on both sides of the fixed column (501).

10. The vegetable and fruit packaging equipment according to claim 9, characterized in that: The disassembly and assembly component (502) includes a fastening stud (5021), a movable limiting cone (5022) and a fixed limiting cone (5023) inside. The movable limiting cone (5022) is sleeved on one end of the rotating rod (204). The surface of the movable limiting cone (5022) is tightly fitted with the surface of the film roll (201). The surface of the movable limiting cone (5022) is threadedly connected with the fastening stud (5021). One end of the fastening stud (5021) passes through the movable limiting cone (5022) and is threadedly fastened to the surface of the rotating rod (204). A fixed limiting cone (5023) is provided on one side of the movable limiting cone (5022). The surface of the fixed limiting cone (5023) is fixedly connected to the surface of the rotating rod (204). The surface of the fixed limiting cone (5023) is tightly fitted with the surface of the film roll (201).

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