A plastic packaging bag fixed distance melting and cutting device and its use method

Abstract

The invention discloses a fixed-distance melting and cutting device for plastic packaging bags and a use method thereof, and relates to the technical field of plastic packaging bag production equipment, comprising a frame, a positioning frame is fixedly installed on the surface of the frame, an inner cavity of the frame is rotatably connected with a pressure roller and two limiting rollers through a bearing, the two limiting rollers are both arranged on one side of the pressure roller, a first motor is fixedly installed on one side of the positioning frame, an output end of the first motor penetrates into the inner cavity of the frame and is fixedly connected with a transmission roller, the fixed-distance melting and cutting device for plastic packaging bags and a use method thereof, by arranging a bearing unit, when installing a material roller loaded with plastic packaging bags, an external control switch is used to start a second motor, so that the second synchronous wheel drives the first bidirectional screw rod to rotate, and the spacing between the two first threaded sleeves and the two mounting frames is adjusted, and by adjusting the spacing of the mounting frames, material rollers of different sizes can be installed, thereby improving the production efficiency of plastic packaging bags.

Description

Technical Field

[0001] The invention relates to the technical field of plastic packaging bag production equipment, in particular to a plastic packaging bag fixed-distance melting and cutting device and a use method thereof. Background Art

[0002] Plastic bags are bags made of plastic as the main raw material. These plastic bags are usually made of chemical petroleum products extracted from petroleum or coal. During the production process, these raw materials undergo various chemical reactions and processing, such as polymerization, condensation, and addition, and finally form the plastic bags we usually see.

[0003] When plastic bags are produced, the rolled plastic packaging bags need to be cut. Since the specifications of plastic packaging bags are different, the sizes of the material rollers containing the plastic packaging bags are also different. Before installing the material rollers, the staff need to manually adjust the mounting frame that supports the material rollers and the stop bars that limit the plastic packaging bags, which will reduce the production efficiency of the plastic packaging bags.

[0004] Combining the above problems, we will find that it is difficult to avoid the above problems at the same time when using the existing melting and cutting devices on the market, and even if they can be solved, they need to be solved with the cooperation of external tools, which cannot achieve the desired effect. Therefore, we propose a fixed-distance melting and cutting device for plastic packaging bags. Summary of the invention

[0005] The object of the present invention is to provide a plastic packaging bag fixed-distance melting and cutting device and a method of using the same to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fixed-distance melting and cutting device for plastic packaging bags, comprising a frame, a positioning frame is fixedly installed on the surface of the frame, a pressure roller and two limiting rollers are rotatably connected to the inner cavity of the frame through a bearing, and the two limiting rollers are both arranged on one side of the pressure roller, a first motor is fixedly installed on one side of the positioning frame, an output end of the first motor passes through the inner cavity of the frame and is fixedly connected to a transmission roller, one end of the transmission roller is rotatably connected to the inner wall of the frame through a bearing, and a load-bearing limiting mechanism is arranged on the surface of the frame;

[0007] The load-bearing and limiting mechanism comprises a load-bearing unit, which is arranged on the surface of the frame and is used to carry material rollers of different sizes;

[0008] The load-bearing and limiting mechanism further includes a limiting unit, which is arranged in the inner cavity of the frame, and is used in conjunction with the load-bearing unit, and is used to limit the two sides of the transported plastic packaging bag;

[0009] A melting and cutting mechanism is arranged on the top of the positioning frame. The melting and cutting mechanism is used in conjunction with the load-bearing and limiting mechanism. The melting and cutting mechanism is used to quantitatively cut the plastic packaging bags.

[0010] Preferably, the bearing unit includes a fixing frame and a limiting shell, the fixing frame and the limiting shell are both fixedly mounted on the surface of the frame, one side of the fixing frame is fixedly connected to the second motor, the output end of the second motor passes through the inner cavity of the fixing frame and is fixedly connected to the first synchronous wheel, one side of the first synchronous wheel is rotatably connected to the inner wall of the frame through a bearing, the surface of the first synchronous wheel is connected to the second synchronous wheel through a belt drive, one side of the second synchronous wheel is fixedly connected to a first bidirectional screw rod, one end of the first bidirectional screw rod passes through the inner cavity of the limiting shell and is rotatably connected to the inner wall of the limiting shell through a bearing, the surface of the first bidirectional screw rod is threadedly connected to two first threaded sleeves, one side of the first threaded sleeve contacts with the inner wall of the limiting shell, and the other side of the first threaded sleeve is fixedly connected to a mounting frame, and the number of the mounting frames is two.

[0011] Preferably, a support plate is fixedly connected to the bottom of the limiting shell, and one side of the support plate is fixedly connected to the surface of the frame by bolts.

[0012] Preferably, the limiting unit includes a third synchronous wheel, the third synchronous wheel is arranged on one side of the frame, the surface of the third synchronous wheel is connected to the first synchronous wheel through a belt, one side of the third synchronous wheel is fixedly connected to a second bidirectional screw rod, one end of the second bidirectional screw rod penetrates into the inner cavity of the frame and is rotatably connected to the inner wall of the frame through a bearing, the surface of the second bidirectional screw rod is threadedly connected to two second threaded sleeves, the tops of the two second threaded sleeves are fixedly connected to a fixing plate, the bottom of the fixing plate is fixedly connected to two positioning plates, and the bottom of the positioning plate contacts the inner wall of the frame.

[0013] Preferably, two clamping plates are fixedly connected to the bottom of the fixed plate, and the clamping plates are slidably connected to the surface of the limiting roller.

[0014] Preferably, the melting and cutting mechanism includes a fixed frame, which is fixedly installed on the top of the positioning frame, and a third motor is fixedly installed on the top of the fixed frame, and the output end of the third motor is fixedly connected to a circular plate, one side of the circular plate is rotatably connected to a limit rod through an axle pin, and the bottom of the limit rod is rotatably connected to a connecting rod through an axle pin, and the surface of the connecting rod contacts the inner wall of the positioning frame, and the bottom of the connecting rod is fixedly connected to a mounting shell, and the inner cavity of the mounting shell is fixedly connected to two electric heating tubes, and the inner cavity of the mounting shell is fixedly connected to a cutting knife through bolts, and the cutting knife is arranged on the inner side of the two electric heating tubes.

[0015] Preferably, positioning blocks are fixedly connected to both sides of the mounting shell, a sliding rod is fixedly connected to the top of the positioning block, and one end of the sliding rod passes through the positioning frame and is slidably connected to the inner wall of the positioning frame.

[0016] Preferably, a protection box is fixedly mounted on the top of the positioning frame, and the protection box is sleeved on the outside of the third motor.

[0017] Preferably, a limit frame is fixedly installed in the inner cavity of the frame, and the limit frame is arranged on one side of the cutting knife.

[0018] A method for using a fixed-distance melting and cutting device for plastic packaging bags comprises the following steps:

[0019] S1: Before installing the material roller with the plastic packaging bag, use the external control switch to start the second motor, so that the first synchronous wheel drives the second synchronous wheel to rotate, and the second synchronous wheel drives the first bidirectional screw rod to rotate when rotating. By rotating the first bidirectional screw rod, the distance between the two mounting frames can be adjusted, so as to facilitate the installation of material rollers of different sizes;

[0020] S2: After the second motor is started, the third synchronous wheel is driven by the rotation of the first synchronous wheel to rotate accordingly. The third synchronous wheel drives the second bidirectional screw to rotate during the rotation, so that the positions of the four positioning plates can be adjusted. By adjusting the positions of the positioning plates, the two sides of plastic packaging bags of different specifications can be limited, thereby improving the stability of their transportation;

[0021] S3: After the material roller containing the plastic packaging bag is installed, one end of the plastic packaging bag passes through the pressing roller and the limiting roller and is placed at the bottom of the transmission roller. The plastic packaging bag is then conveyed under the action of the transmission roller. During the conveying process, the third motor drives the circular plate to rotate, causing the cutting knife to move up and down reciprocatingly, thereby achieving fixed-distance cutting of the plastic packaging bag.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention sets a bearing unit. When installing a material roller loaded with plastic packaging bags, an external control switch is used to start the second motor, so that the second synchronous wheel drives the first bidirectional screw to rotate, and the distance between the two first threaded sleeves and the two mounting frames is adjusted. By adjusting the distance between the mounting frames, material rollers of different sizes can be installed, thereby improving the production efficiency of plastic packaging bags.

[0024] 2. The present invention sets a limit unit, and in the process of adjusting the mounting frame by rotating the second motor output end, the spacing of the positioning plates can be adjusted at the same time. The positioning plates are used to limit the two sides of the plastic packaging bag, which can improve the stability of the plastic packaging bag transportation and thus improve its cutting quality.

[0025] 3. The present invention provides a melting and cutting mechanism and utilizes a third motor to drive the circular plate to rotate, so that the cutting knife can make a vertical reciprocating motion to cut the plastic packaging bag. At the same time, by adjusting the rotation speed of the third motor, the cutting knife can be controlled to cut the plastic packaging bag to a fixed length, and the cutting knife is heated by an electric heating tube, which can improve the cutting efficiency, improve the cutting quality, and extend the service life of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a structural rear view of the frame, the load-bearing and limiting mechanism and the melting and cutting mechanism of the present invention;

[0028] Figure 3 It is a structural cross-sectional view of the positioning frame and the melting and cutting mechanism of the present invention.

[0029] Figure 4 This is an enlarged cross-sectional view of the structure of the installation shell and the electric heating tube of the present invention.

[0030] Figure 5 It is a structural rear view of the frame and the load-bearing and limiting mechanism of the present invention.

[0031] Figure 6 It is a structural cross-sectional view of the load-bearing and limiting mechanism of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the bearing unit of the present invention.

[0033] Figure 8 It is a schematic diagram of the structure of the second motor and the limiting unit of the present invention.

[0034] In the figure: 1, frame; 11, positioning frame; 12, pressure roller; 13, limiting roller; 14, first motor; 15, transmission roller; 16, protection box; 17, limiting frame; 2, load-bearing limiting mechanism; 21, load-bearing unit; 2101, fixing frame; 2102, limiting shell; 2103, second motor; 2104, first synchronous wheel; 2105, second synchronous wheel; 2106, first bidirectional screw rod; 2107, first threaded sleeve; 2108, mounting frame; 2109 , support plate; 22, limit unit; 2201, third synchronous wheel; 2202, second bidirectional lead screw; 2203, second threaded sleeve; 2204, fixed plate; 2205, positioning plate; 2206, clamping plate; 3, melting and cutting mechanism; 301, fixed frame; 302, third motor; 303, circular plate; 304, limit rod; 305, connecting rod; 306, mounting shell; 307, electric heating tube; 308, cutting knife; 309, positioning block; 310, sliding rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The present invention provides a technical solution: a fixed-distance melting and cutting device for plastic packaging bags, comprising a frame 1, a positioning frame 11 is fixedly installed on the surface of the frame 1, a pressure roller 12 and two limiting rollers 13 are rotatably connected to the inner cavity of the frame 1 through a bearing, and the two limiting rollers 13 are both arranged on one side of the pressure roller 12, a first motor 14 is fixedly installed on one side of the positioning frame 11, an output end of the first motor 14 passes through the inner cavity of the frame 1 and is fixedly connected to a transmission roller 15, one end of the transmission roller 15 is rotatably connected to the inner wall of the frame 1 through a bearing, and a load-bearing limiting mechanism 2 is arranged on the surface of the frame 1;

[0037] The load-bearing and limiting mechanism 2 comprises a load-bearing unit 21 . The load-bearing unit 21 is arranged on the surface of the frame 1 . The load-bearing unit 21 is used for bearing material rollers of different sizes.

[0038] As a further limitation of the load-bearing and limiting mechanism 2 of the present invention, the load-bearing unit 21 includes a fixed frame 2101 and a limiting shell 2102, the fixed frame 2101 and the limiting shell 2102 are both fixedly installed on the surface of the frame 1, one side of the fixed frame 2101 is fixedly connected to the second motor 2103, the output end of the second motor 2103 passes through the inner cavity of the fixed frame 2101 and is fixedly connected to the first synchronous wheel 2104, one side of the first synchronous wheel 2104 is rotatably connected to the inner wall of the frame 1 through a bearing, the surface of the first synchronous wheel 2104 is connected to the second synchronous wheel 2105 through a belt drive, one side of the second synchronous wheel 2105 is fixedly connected to the first bidirectional screw rod 2106, one end of the first bidirectional screw rod 2106 passes through the inner cavity of the limiting shell 2102 and passes through the bearing The first bidirectional screw rod 2106 is rotatably connected to the inner wall of the limiting shell 2102, and the surface of the first threaded sleeve 2107 is threadedly connected to two first threaded sleeves 2107, one side of the first threaded sleeve 2107 is in contact with the inner wall of the limiting shell 2102, and the other side of the first threaded sleeve 2107 is fixedly connected to a mounting bracket 2108, and the number of the mounting brackets 2108 is two; by setting the bearing unit 21, when installing the material roller loaded with plastic packaging bags, the second motor 2103 is started by an external control switch, so that the second synchronous wheel 2105 drives the first bidirectional screw rod 2106 to rotate, and the distance between the two first threaded sleeves 2107 and the two mounting brackets 2108 is adjusted. By adjusting the distance between the mounting brackets 2108, material rollers of different sizes can be installed, thereby improving the production efficiency of plastic packaging bags.

[0039] The bottom of the limiting shell 2102 is fixedly connected with a support plate 2109, and one side of the support plate 2109 is fixedly connected to the surface of the frame 1 by bolts; by providing the support plate 2109, the limiting shell 2102 can be supported and fixed, thereby improving the stability of the limiting shell 2102 in use.

[0040] The specific implementation method of this embodiment is as follows: when in use, the staff uses the external control switch to start the second motor 2103, and the output end of the second motor 2103 drives the first synchronous wheel 2104 to rotate. When the first synchronous wheel 2104 rotates, it drives two belts to transmit at the same time, one of the belts drives the second synchronous wheel 2105 to rotate when transmitting, and the second synchronous wheel 2105 drives the first bidirectional screw rod 2106 to rotate when rotating, and the first bidirectional screw rod 2106 drives the two first threaded sleeves 2107 to move in opposite directions when rotating, and the two first threaded sleeves 2107 drive the two mounting frames 2108 to move in opposite directions when moving in opposite directions. When the two mounting frames 2108 move in opposite directions to the specified position, the staff places the material roller containing the plastic packaging bag in the inner cavity of the mounting frame 2108, and the installation of material rollers of different sizes can be completed.

[0041] Example 2: Please refer to Figure 2 , Figure 5, Figure 6 and Figure 8 The present invention provides a technical solution: a plastic packaging bag spacing melting and cutting device and a method of using the same. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. The load-bearing and limiting mechanism 2 also includes a limiting unit 22, which is arranged in the inner cavity of the frame 1. The limiting unit 22 is used in conjunction with the load-bearing unit 21. The limiting unit 22 is used to limit the two sides of the transported plastic packaging bag.

[0042] As a further limitation of the load-bearing limiting mechanism 2 of the present invention, the limiting unit 22 includes a third synchronous wheel 2201, the third synchronous wheel 2201 is arranged on one side of the frame 1, the surface of the third synchronous wheel 2201 is connected to the first synchronous wheel 2104 through a belt, and a second bidirectional screw rod 2202 is fixedly connected to one side of the third synchronous wheel 2201, one end of the second bidirectional screw rod 2202 passes through the inner cavity of the frame 1 and is rotatably connected to the inner wall of the frame 1 through a bearing, and the surface of the second bidirectional screw rod 2202 is threadedly connected to two second threaded sleeves 220 3. The tops of the two second threaded sleeves 2203 are fixedly connected with a fixing plate 2204, and the bottoms of the fixing plates 2204 are fixedly connected with two positioning plates 2205, and the bottoms of the positioning plates 2205 are in contact with the inner wall of the frame 1; by setting the limiting unit 22, in the process of adjusting the mounting frame 2108 by rotating the output end of the second motor 2103, the spacing of the positioning plates 2205 can be adjusted at the same time, and the positioning plates 2205 are used to limit the two sides of the plastic packaging bag, which can improve the stability of the plastic packaging bag transportation, thereby improving its cutting quality.

[0043] Two clamping plates 2206 are fixedly connected to the bottom of the fixed plate 2204, and the clamping plates 2206 are slidably connected to the surface of the limiting roller 13; by setting the clamping plates 2206 and the limiting roller 13 in coordination, the fixed plate 2204 can be limited, thereby improving the stability of the lateral movement of the fixed plate 2204.

[0044] The specific implementation of this embodiment is as follows: when the second motor 2103 drives the first synchronous wheel 2104 to rotate, another belt drives the third synchronous wheel 2201 to rotate, and the third synchronous wheel 2201 drives the second bidirectional screw rod 2202 to rotate when rotating, and the second bidirectional screw rod 2202 drives the two second threaded sleeves 2203 to move in opposite directions when rotating, and the two second threaded sleeves 2203 drive the two fixed plates 2204 to move in opposite directions when moving in opposite directions, and the two fixed plates 2204 drive four clamping plates 2206 and four positioning plates 2205 to move when moving in opposite directions, and the clamping plates 2206 slide on the surface of the limiting roller 13 to limit the fixing plates 2204 laterally, and when the mounting frame 2108 is adjusted to the specified position, the output end of the second motor 2103 stops rotating, and at this time, the four positioning plates 2205 are just adjusted to the specified width, and the positioning plates 2205 are used to limit the two sides of the plastic packaging bag, so as to improve the stability of the plastic packaging bag transportation.

[0045] Example 3: Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides a technical solution: a fixed-distance melting and cutting device for plastic packaging bags and a method of using the same. The present invention makes corresponding improvements to the technical problems mentioned in the background technology. A melting and cutting mechanism 3 is provided on the top of the positioning frame 11. The melting and cutting mechanism 3 is used in conjunction with the load-bearing and limiting mechanism 2. The melting and cutting mechanism 3 is used to quantitatively cut the plastic packaging bags.

[0046] As a further limitation of the melting and cutting mechanism 3 of the present invention, the melting and cutting mechanism 3 includes a fixed frame 301, the fixed frame 301 is fixedly installed on the top of the positioning frame 11, a third motor 302 is fixedly installed on the top of the fixed frame 301, the output end of the third motor 302 is fixedly connected to a circular plate 303, one side of the circular plate 303 is rotatably connected to a limit rod 304 through an axle pin, the bottom of the limit rod 304 is rotatably connected to a connecting rod 305 through an axle pin, the surface of the connecting rod 305 contacts the inner wall of the positioning frame 11, the bottom of the connecting rod 305 is fixedly connected to a mounting shell 306, and the inner cavity of the mounting shell 306 is fixedly connected There are two electric heating tubes 307, and the inner cavity of the mounting shell 306 is fixedly connected with a cutting knife 308 by bolts, and the cutting knife 308 is arranged on the inner side of the two electric heating tubes 307; by setting the melting and cutting mechanism 3, the circular plate 303 is driven to rotate by the third motor 302, so that the cutting knife 308 can be made to reciprocate vertically to cut the plastic packaging bag, and at the same time, by adjusting the rotation speed of the third motor 302, the cutting knife 308 can be controlled to cut the plastic packaging bag to a fixed length, and the cutting knife 308 is heated by the electric heating tube 307, so that the cutting efficiency and cutting quality can be improved and the service life of the cutting knife 308 can be extended.

[0047] Both sides of the mounting shell 306 are fixedly connected with positioning blocks 309, the top of the positioning blocks 309 is fixedly connected with a sliding rod 310, one end of the sliding rod 310 passes through the positioning frame 11 and is slidably connected to the inner wall of the positioning frame 11; by setting the positioning block 309 and the sliding rod 310 in coordination, the mounting shell 306 can be limited, thereby improving the stability of the vertical movement of the mounting shell 306.

[0048] A protection box 16 is fixedly mounted on the top of the positioning frame 11, and the protection box 16 is sleeved on the outside of the third motor 302; by providing the protection box 16, the third motor 302 can be protected, thereby extending its service life.

[0049] The inner cavity of the frame 1 is fixedly installed with a limit frame 17, and the limit frame 17 is arranged on one side of the cutting knife 308; by setting the limit frame 17, the cut plastic packaging bags can be limited, so that it is convenient for the staff to take and organize them.

[0050] The specific implementation method of this embodiment is as follows: after the material roller is installed, the staff pulls one end of the plastic packaging bag through the pressing roller 12 and the limiting roller 13, and places it at the bottom of the transmission roller 15, and then uses the external control switch to start the first motor 14. The output end of the first motor 14 drives the transmission roller 15 to rotate when rotating, so that the plastic packaging bag can be transported. During the transportation process, the staff uses the external control switch to start the third motor 302 and the electric heating tube 307. The electric heating tube 307 heats the cutting knife 308, which can improve the cutting knife 308. In order to improve the cutting efficiency and quality, the output end of the third motor 302 drives the circular plate 303 to rotate. When the circular plate 303 rotates, it drives one end of the limiting rod 304 to rotate about the axis of the circular plate 303. At this time, the other end of the limiting rod 304 drives the connecting rod 305 to move back and forth. When the connecting rod 305 moves back and forth, it drives the mounting shell 306 to move back and forth. When the mounting shell 306 moves back and forth, it drives the cutting knife 308 to move back and forth. When the cutting knife 308 moves back and forth, it performs a fixed-distance cutting process on the plastic packaging bag at the bottom.

[0051] A method for using a fixed-distance melting and cutting device for plastic packaging bags comprises the following steps:

[0052] S1: Before installing the material roller with the plastic packaging bag, the second motor 2103 is started by using an external control switch, so that the first synchronous wheel 2104 drives the second synchronous wheel 2105 to rotate, and the second synchronous wheel 2105 drives the first bidirectional screw rod 2106 to rotate when rotating. By rotating the first bidirectional screw rod 2106, the distance between the two mounting frames 2108 can be adjusted, so as to facilitate the installation of material rollers of different sizes;

[0053] S2: After the second motor 2103 is started, the third synchronous wheel 2201 is also rotated under the rotation of the first synchronous wheel 2104. When the third synchronous wheel 2201 rotates, it drives the second bidirectional screw rod 2202 to rotate, so that the positions of the four positioning plates 2205 can be adjusted. By adjusting the positions of the positioning plates 2205, the two sides of plastic packaging bags of different specifications can be limited, thereby improving the stability of their transportation;

[0054] S3: After the material roller containing the plastic packaging bag is installed, one end of the plastic packaging bag is passed through the pressure roller 12 and the limiting roller 13 and placed at the bottom of the transmission roller 15. The plastic packaging bag is then conveyed under the action of the transmission roller 15. During the conveying process, the third motor 302 drives the circular plate 303 to rotate, so that the cutting knife 308 moves back and forth up and down, thereby realizing fixed-distance cutting of the plastic packaging bag.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic packaging bag fixed-distance melting and cutting device, comprising a frame (1), characterized in that: A positioning frame (11) is fixedly mounted on the surface of the frame (1); a pressure roller (12) and two limiting rollers (13) are rotatably connected to the inner cavity of the frame (1) via a bearing; the two limiting rollers (13) are both arranged on one side of the pressure roller (12); a first motor (14) is fixedly mounted on one side of the positioning frame (11); an output end of the first motor (14) passes through the inner cavity of the frame (1) and is fixedly connected to a transmission roller (15); one end of the transmission roller (15) is rotatably connected to the inner wall of the frame (1) via a bearing; a load-bearing limiting mechanism (2) is arranged on the surface of the frame (1); The load-bearing and limiting mechanism (2) comprises a load-bearing unit (21), wherein the load-bearing unit (21) is arranged on the surface of the frame (1), and the load-bearing unit (21) is used to bear material rollers of different sizes; The load-bearing limiting mechanism (2) further comprises a limiting unit (22), wherein the limiting unit (22) is arranged in the inner cavity of the frame (1), and the limiting unit (22) is used in conjunction with the load-bearing unit (21), and the limiting unit (22) is used to limit the two sides of the transported plastic packaging bag; A melting and cutting mechanism (3) is arranged on the top of the positioning frame (11). The melting and cutting mechanism (3) is used in conjunction with the load-bearing and limiting mechanism (2). The melting and cutting mechanism (3) is used to quantitatively cut plastic packaging bags.

2. A plastic packaging bag fixed distance melting and cutting device according to claim 1, characterized in that: The bearing unit (21) comprises a fixing frame (2101) and a limiting shell (2102), wherein the fixing frame (2101) and the limiting shell (2102) are both fixedly mounted on the surface of the frame (1), a second motor (2103) is fixedly connected to one side of the fixing frame (2101), an output end of the second motor (2103) passes through the inner cavity of the fixing frame (2101) and is fixedly connected to a first synchronous wheel (2104), one side of the first synchronous wheel (2104) is rotatably connected to the inner wall of the frame (1) via a bearing, and a surface of the first synchronous wheel (2104) is connected to a second synchronous wheel (2104) via a belt drive. 2105), one side of the second synchronous wheel (2105) is fixedly connected with a first bidirectional screw rod (2106), one end of the first bidirectional screw rod (2106) passes through the inner cavity of the limiting shell (2102) and is rotatably connected to the inner wall of the limiting shell (2102) through a bearing, and the surface of the first bidirectional screw rod (2106) is threadedly connected with two first threaded sleeves (2107), one side of the first threaded sleeve (2107) is in contact with the inner wall of the limiting shell (2102), and the other side of the first threaded sleeve (2107) is fixedly connected with a mounting bracket (2108), and the number of the mounting brackets (2108) is two.

3. A plastic packaging bag fixed distance melting and cutting device according to claim 2, characterized in that: The bottom of the limiting shell (2102) is fixedly connected to a support plate (2109), and one side of the support plate (2109) is fixedly connected to the surface of the frame (1) via bolts.

4. A plastic packaging bag fixed distance melting and cutting device according to claim 1, characterized in that: The limiting unit (22) comprises a third synchronous wheel (2201), the third synchronous wheel (2201) being arranged on one side of the frame (1), the surface of the third synchronous wheel (2201) being transmission-connected to the first synchronous wheel (2104) via a belt, a second bidirectional screw rod (2202) being fixedly connected to one side of the third synchronous wheel (2201), one end of the second bidirectional screw rod (2202) passing through the inner cavity of the frame (1) and being rotationally connected to the inner wall of the frame (1) via a bearing, the surface of the second bidirectional screw rod (2202) being threadedly connected to two second threaded sleeves (2203), the tops of the two second threaded sleeves (2203) being fixedly connected to a fixing plate (2204), the bottom of the fixing plate (2204) being fixedly connected to two positioning plates (2205), the bottom of the positioning plate (2205) being in contact with the inner wall of the frame (1).

5. A plastic packaging bag fixed distance melting and cutting device according to claim 4, characterized in that: Two clamping plates (2206) are fixedly connected to the bottom of the fixed plate (2204), and the clamping plates (2206) are slidably connected to the surface of the limiting roller (13).

6. A plastic packaging bag fixed distance melting and cutting device according to claim 1, characterized in that: The melting and cutting mechanism (3) comprises a fixed frame (301), wherein the fixed frame (301) is fixedly mounted on the top of the positioning frame (11), a third motor (302) is fixedly mounted on the top of the fixed frame (301), an output end of the third motor (302) is fixedly connected to a circular plate (303), one side of the circular plate (303) is rotatably connected to a limit rod (304) via an axle pin, the bottom of the limit rod (304) is rotatably connected to a connecting rod (305) via an axle pin, the surface of the connecting rod (305) contacts the inner wall of the positioning frame (11), the bottom of the connecting rod (305) is fixedly connected to a mounting shell (306), the inner cavity of the mounting shell (306) is fixedly connected to two electric heating tubes (307), the inner cavity of the mounting shell (306) is fixedly connected to a cutting knife (308) via bolts, and the cutting knife (308) is arranged on the inner side of the two electric heating tubes (307).

7. A plastic packaging bag fixed distance melting and cutting device according to claim 6, characterized in that: Both sides of the mounting shell (306) are fixedly connected with positioning blocks (309), the top of the positioning block (309) is fixedly connected with a sliding rod (310), and one end of the sliding rod (310) passes through the positioning frame (11) and is slidably connected to the inner wall of the positioning frame (11).

8. A plastic packaging bag fixed distance melting and cutting device according to claim 6, characterized in that: A protection box (16) is fixedly mounted on the top of the positioning frame (11), and the protection box (16) is sleeved on the outside of the third motor (302).

9. A plastic packaging bag fixed distance melting and cutting device according to claim 6, characterized in that: A limit frame (17) is fixedly installed in the inner cavity of the frame (1), and the limit frame (17) is arranged on one side of the cutting knife (308).

10. A method for using a distance melting and cutting device for plastic packaging bags according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Before installing the material roller containing the plastic packaging bag, the second motor (2103) is started by using an external control switch, so that the first synchronous wheel (2104) drives the second synchronous wheel (2105) to rotate, and the second synchronous wheel (2105) drives the first bidirectional screw rod (2106) to rotate when rotating. By rotating the first bidirectional screw rod (2106), the distance between the two mounting frames (2108) can be adjusted, so as to facilitate the installation of material rollers of different sizes; S2: After the second motor (2103) is started, the third synchronous wheel (2201) is driven by the rotation of the first synchronous wheel (2104), and the third synchronous wheel (2201) drives the second bidirectional screw rod (2202) to rotate when rotating, so that the positions of the four positioning plates (2205) can be adjusted. By adjusting the positions of the positioning plates (2205), the two sides of plastic packaging bags of different specifications can be limited, thereby improving the stability of their transportation; S3: After the material roller containing the plastic packaging bag is installed, one end of the plastic packaging bag is passed through the pressing roller (12) and the limiting roller (13) and placed at the bottom of the transmission roller (15). The plastic packaging bag is then transported under the action of the transmission roller (15). During the transport process, the third motor (302) drives the circular plate (303) to rotate, causing the cutting knife (308) to move up and down, thereby achieving fixed-distance cutting of the plastic packaging bag.

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