Composite bag pretreatment device for preventing single-material composite film from being adhered to hot knife

Abstract

The utility model provides a composite bag pretreatment device capable of preventing a single-material composite film from being adhered to a hot knife, and relates to the technical field of composite bag pretreatment devices. Two sets of supporting plates are fixed to the upper end of the support, a rotating rod is installed between the two sets of supporting plates through bearings, a worm wheel and a gear are fixed to the rotating rod, a round rod is fixed between the two sets of supporting plates, and two sets of installation bases are installed on the round rod and the rotating rod. According to the utility model, the height of the trough is increased by rotating the second hand wheel, the trough is used for storing an anti-sticking coating, the anti-sticking coating is coated on the bottom roller through the trough, the coating on the bottom roller is uniformly smeared through the scraper blade, the lower layer of a composite film is coated with the coating through the bottom roller, and the top roller is pressed down on the bottom roller, so that the leveling of the composite film is realized; the upper layer of the composite film is sprayed with the coating through the nozzle, so that the upper layer and the lower layer of the composite film are both coated with the anti-sticking coating, the composite film is prevented from sticking during heat sealing, the cost is low, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of composite bag pretreatment devices, and particularly relates to a composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife. Background Technique

[0002] Polyethylene, the main constituent material of a single-material composite bag, can undergo polymer cross-linking under the action of the temperature and pressure of the heat-sealing hot knife of a bag-making machine and thus be "welded" together. Therefore, it is usually selected as the heat-sealing layer of a traditional heterogeneous material composite bag. This layer of material is bonded to other non-heat-sealable films (such as polyamide film, polyester film, etc.) through glue to form a traditional composite film. The non-heat-sealable film on the outer layer of the traditional composite film will not adhere to the hot knife when contacting the heat-sealing hot knife but can conduct heat to the polyethylene layer. Therefore, the traditional composite film can be smoothly heat-sealed to make bags. A single-material composite bag is significantly different from a traditional heterogeneous material composite bag. Since it only contains one type of film material, polyethylene, the composite film bonded by glue has heat-sealability on both sides. When it is heat-sealed by using a heat-sealing hot knife during the conventional bag-making process, the contact surface between the single-material composite film and the hot knife will seriously adhere to the hot knife, making it difficult to smoothly make bags. Therefore, a composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife is designed.

[0003] Currently, the method to solve this problem is to cover the entire single-material composite film with a layer of non-heat-sealable film as an isolation layer between it and the heat-sealing hot knife to achieve the heat-sealing of the single-material composite film, or to coat an anti-adhesion coating on the heat-sealing hot knife. After using it for a period of time, the heat-sealing hot knife needs to be replaced, which has a high cost and is inconvenient to use. Summary of the Utility Model

[0004] An embodiment of the present disclosure relates to a composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife, so as to solve the problems of high cost and inconvenient use of the existing methods for solving the adhesion between a single-material composite film and a hot knife.

[0005] In the first aspect of the present disclosure, a composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife is provided, specifically including: a bracket;

[0006] Two groups of support plates are fixed to the upper end of the bracket. A rotating rod is installed between the two groups of support plates through bearings. A worm gear and a gear are fixed to the rotating rod. A round rod is fixed between the two groups of support plates. Two mounting seats are installed on the round rod and the rotating rod. A first toothed groove rod is movable in the mounting seat. The gear on the rotating rod meshes with the first toothed groove rod. A worm is installed on the mounting seat near the rear end of the rotating rod through a bearing. A first handwheel is fixed to the worm. The worm on the worm meshes with the worm gear on the rotating rod. Connecting cylinders are fixed to the upper ends of the two first toothed groove rods. A connecting rod is fixed between the two connecting cylinders. A cylinder seat is installed on the connecting rod through bolts. A first hydraulic rod is hinged to the cylinder seat. A movable seat is installed on the connecting rod. The piston rod of the first hydraulic rod is connected to the movable seat through a pin shaft. Adjusting plates are installed on the two movable seats through bolts. Waist-shaped grooves are provided on the adjusting plates. Adjusting screws are installed on the two movable seats through bearings. The adjusting screws are in threaded cooperation with the adjusting plates. A scraper is installed on the adjusting plate through bolts.

[0007] In at least some embodiments,

[0008] Gear seats are fixed to the inner walls of the two groups of support plates. A rotating column is installed between the two groups of gear seats through bearings. Two gears are fixed to the rotating column. The two gears are respectively located in the two groups of gear seats. Second toothed groove rods are movable in the two groups of gear seats. The gears on the rotating column mesh with the second toothed groove rods. A material trough is fixed to the upper ends of the two second toothed groove rods.

[0009] In at least some embodiments,

[0010] A worm gear is fixed to the rotating column. A second handwheel is installed on the support plate near the rear end of the bracket through a bearing. A worm is fixed to the second handwheel. The worm on the second handwheel meshes with the worm gear on the rotating column. A bottom roller is installed between the two support plates through bearings. Movable plates slide on the two support plates. Second hydraulic rods are installed on the upper ends of the two support plates through bolts. The lower end of the piston rod of the second hydraulic rod is connected to the upper end of the movable plate. A center rod is installed between the two movable plates through bolts. A top roller is installed on the center rod through a bearing.

[0011] In at least some embodiments,

[0012] A support seat is installed on the support plate near the front end of the bracket through bolts. A first motor is installed on the support seat through bolts. A pulley is fixed to the output shaft of the first motor. A side seat is installed on the support plate through bolts. A transmission rod is installed on the side seat through a bearing. A pulley and a gear are fixed to the transmission rod. The transmission rod is connected to the output shaft of the first motor through a belt. A gear is fixed to the rotating shaft of the bottom roller. The gear on the bottom roller meshes with the gear on the transmission rod.

[0013] In at least some embodiments,

[0014] A middle frame is welded to the right side of the bracket. A first plate and a second plate are fixed on the middle frame. A cross bar is installed between the first plate and the second plate by bolts. A moving seat is movable on the cross bar. A pulley is installed at the front end of the cross bar. A second motor is installed on the second plate by bolts. A pulley is fixed on the output shaft of the second motor. A transmission belt is connected between the two sets of pulleys. The moving seat is connected to the transmission belt by screws. A nozzle is installed on the moving seat by bolts.

[0015] In at least some embodiments,

[0016] A fixed seat is welded to the right side of the middle frame. A bottom rod is installed on the fixed seat through a bearing. Two sets of cams and two sets of eccentric wheels are fixed on the bottom rod. And a gearbox is installed on the fixed seat by bolts. A third motor is installed on the gearbox by bolts. The output end of the gearbox is connected to the bottom rod.

[0017] In at least some embodiments,

[0018] Two connecting seats are sleeved on the two sets of eccentric wheels on the bottom rod. The upper end of the connecting seat is hinged with a vertical rod. A rolling groove is arranged on the vertical rod. A fixed column is fixed on the fixed seat. A contact wheel is installed on the fixed column through a bearing. The contact wheel rolls in the rolling groove on the vertical rod. The upper ends of the two vertical rods are both installed with top seats by bolts. A top rod is installed between the two top seats by bolts. A suspension rod is installed on the top rod by bolts. The lower end of the suspension rod is installed with a top knife by bolts.

[0019] In at least some embodiments,

[0020] Two lifting rods slide on the fixed seat. The lower ends of the two lifting rods are both installed with rollers. The rollers are in contact with the cams. The upper ends of the two lifting rods are fixed with bottom knives. Heating tubes are fixed inside both the bottom knife and the top knife.

[0021] The utility model provides a composite bag pretreatment device for preventing a single - material composite film from sticking to a hot knife, and has the following beneficial effects:

[0022] In the utility model, by rotating the second hand wheel, the height of the material trough rises. The material trough is used to store the anti - sticking coating. The anti - sticking coating is applied to the bottom roller through the material trough. The coating on the bottom roller is spread evenly by a squeegee. The lower layer of the composite film is coated with the coating through the bottom roller. The top roller presses down on the bottom roller to level the composite film. The upper layer of the composite film is sprayed with the coating through the nozzle, so that both the upper and lower layers of the composite film are coated with the anti - sticking coating, preventing the composite film from sticking during heat sealing. The cost is low and the operation is convenient.

[0023] In addition, in the present utility model, the height of the scraping plate can be adjusted by rotating the first handwheel, the tilt angle of the scraping plate can be adjusted by extending and retracting the first hydraulic rod, and the tightness between the scraping plate and the bottom roller can be adjusted by rotating the adjusting screw rod, which is convenient to adjust. Moreover, by operating the third motor, the bottom knife and the top knife can be made to approach each other to achieve heat sealing of the composite film, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings of the embodiments will be briefly introduced below.

[0025] The accompanying drawings in the following description only relate to some embodiments of the present utility model and do not limit the present utility model.

[0026] In the accompanying drawings:

[0027] Figure 1 A schematic diagram showing the overall structure of the present application is shown;

[0028] Figure 2 A schematic diagram showing the structure of the support plate of the present application is shown;

[0029] Figure 3 A schematic diagram showing the Figure 2 enlarged structure of part A in the present application is shown;

[0030] Figure 4 A schematic diagram showing the structure on the right side of the bracket of the present application is shown;

[0031] Figure 5 A schematic diagram showing the Figure 4 enlarged structure of part B in the present application is shown;

[0032] Figure 6 A schematic diagram showing the structure of the intermediate frame of the present application is shown;

[0033] Figure 7 A schematic diagram showing the structure of the fixed seat of the present application is shown;

[0034] Figure 8 A schematic diagram showing the Figure 7 enlarged structure of part C in the present application is shown.

[0035] LIST OF REFERENCE NUMERALS

[0036] 1. Support; 11. Support plate; 111. Rotating rod; 112. Round rod; 113. Mounting seat; 114. First toothed groove rod; 115. First handwheel; 116. Connecting cylinder; 1161. Connecting rod; 1162. Cylinder seat; 1163. Movable seat; 1164. First hydraulic rod; 117. Adjusting plate; 1171. Scraper; 1172. Adjusting screw; 12. Bottom roller; 13. Movable plate; 131. Second hydraulic rod; 132. Central rod; 133. Top roller; 14. Gear seat; 141. Rotating column; 142. Second handwheel; 143. Second toothed groove rod; 144. Feeding trough; 15. Support base; 151. First motor; 152. Side seat; 1521. Transmission rod;

[0037] 2. Intermediate frame; 21. First plate; 22. Second plate; 221. Second motor; 23. Cross bar; 24. Moving seat; 241. Nozzle;

[0038] 3. Fixed seat; 31. Bottom rod; 311. Cam; 312. Gearbox; 313. Third motor; 314. Connecting seat; 315. Connecting seat; 316. Vertical rod; 3161. Top seat; 317. Top rod; 3171. Suspension rod; 318. Top knife; 32. Fixed column; 321. Contact wheel; 33. Lifting rod; 331. Bottom knife; 332. Heating tube. Detailed implementation mode

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0040] Embodiment 1: Please refer to Figures 1 to 8 :

[0041] The present utility model provides a composite bag pretreatment device for preventing adhesion between a single - material composite film and a hot knife, comprising: a support 1;

[0042] At the upper end of the bracket 1, two groups of support plates 11 are fixed. A rotating rod 111 is installed between the two groups of support plates 11 through bearings. A worm gear and a gear are fixed on the rotating rod 111. And a round rod 112 is fixed between the two groups of support plates 11. Two groups of mounting seats 113 are installed on the round rod 112 and the rotating rod 111. A first toothed groove rod 114 is movable in the mounting seat 113. The gear on the rotating rod 111 meshes with the first toothed groove rod 114. A worm is installed on the mounting seat 113 near the rear end of the rotating rod 111 through a bearing. A first handwheel 115 is fixed on the worm. The worm meshes with the worm gear on the rotating rod 111. Connecting cylinders 116 are fixed at the upper ends of the two groups of first toothed groove rods 114. A connecting rod 1161 is fixed between the two groups of connecting cylinders 116. A cylinder seat 1162 is installed on the connecting rod 1161 through bolts. A first hydraulic rod 1164 is hinged on the cylinder seat 1162. And a movable seat 1163 is installed on the connecting rod 1161. The piston rod of the first hydraulic rod 1164 is connected to the movable seat 1163 through a pin shaft. An adjusting plate 117 is installed on the two groups of movable seats 1163 through bolts. A kidney-shaped groove is provided on the adjusting plate 117. And adjusting screws 1172 are installed on the two groups of movable seats 1163 through bearings. The adjusting screws 1172 are in threaded cooperation with the adjusting plate 117. A scraping plate 1171 is installed on the adjusting plate 117 through bolts.

[0043] In the embodiment of the present disclosure,

[0044] On the inner walls of both groups of support plates 11, gear seats 14 are fixed. A rotating column 141 is installed between the two groups of gear seats 14 through bearings. Two gears are fixed on the rotating column 141. The two gears are respectively located in the two groups of gear seats 14. In each of the two groups of gear seats 14, a second toothed groove rod 143 is movable. The gears on the rotating column 141 are meshed with the second toothed groove rod 143. The upper ends of the two second toothed groove rods 143 are fixed with a material groove 144. A worm gear is fixed on the rotating column 141. On the support plate 11 near the rear end of the bracket 1, a second handwheel 142 is installed through bearings. A worm is fixed on the second handwheel 142. The worm on the second handwheel 142 is meshed with the worm gear on the rotating column 141. A bottom roller 12 is installed between the two groups of support plates 11 through bearings. And on both groups of support plates 11, movable plates 13 are slidable. On the upper ends of the two groups of support plates 11, second hydraulic rods 131 are installed through bolts. The lower end of the piston rod of the second hydraulic rod 131 is connected to the upper end of the movable plate 13. A central rod 132 is installed between the two groups of movable plates 13 through bolts. A top roller 133 is installed on the central rod 132 through bearings. On the support plate 11 near the front end of the bracket 1, a support seat 15 is installed through bolts. A first motor 151 is installed on the support seat 15 through bolts. A pulley is fixed on the output shaft of the first motor 151. And on the support plate 11, a side seat 152 is installed through bolts. A transmission rod 1521 is installed on the side seat 152 through bearings. A pulley and a gear are fixed on the transmission rod 1521. The transmission rod 1521 and the output shaft of the first motor 151 are connected by a belt. A gear is fixed on the rotating shaft of the bottom roller 12. The gear on the bottom roller 12 is meshed with the gear on the transmission rod 1521. Its functions are: rotate the second handwheel 142 to raise the height of the material groove 144. The material groove 144 is used to store the anti-sticking coating. The anti-sticking coating is applied on the bottom roller 12 through the material groove 144. Extend the second hydraulic rod 131 to press the top roller 133 on the bottom roller 12 to achieve the leveling of the composite film.

[0045] Embodiment 2, on the basis of Embodiment 1,

[0046] A middle frame 2 is welded to the right side of the bracket 1. A first plate 21 and a second plate 22 are fixed on the middle frame 2. A cross bar 23 is installed between the first plate 21 and the second plate 22 through bolts. A moving seat 24 is movable on the cross bar 23. A pulley is installed at the front end of the cross bar 23. A second motor 221 is installed on the second plate 22 through bolts. A pulley is fixed on the output shaft of the second motor 221. A transmission belt is connected between the two pulleys. The moving seat 24 is connected to the transmission belt by screws. A nozzle 241 is installed on the moving seat 24 through bolts. Its functions are: spray the coating on the upper layer of the composite film through the nozzle 241. Operate the second motor 221 to adjust the position of the nozzle 241 to improve the uniformity of the coating application.

[0047] Embodiment 3, on the basis of Embodiment 1 and Embodiment 2,

[0048] A fixed seat 3 is welded to the right side of the middle frame 2. A bottom rod 31 is installed on the fixed seat 3 through a bearing. Two groups of cams 311 and two groups of eccentric wheels 314 are fixed on the bottom rod 31. And a gearbox 312 is installed on the fixed seat 3 through bolts. A third motor 313 is installed on the gearbox 312 through bolts. The output end of the gearbox 312 is connected to the bottom rod 31. Two connecting seats 315 are sleeved on the two groups of eccentric wheels 314 on the bottom rod 31. The upper end of the connecting seat 315 is hinged with a vertical rod 316. A rolling groove is arranged on the vertical rod 316. A fixed column 32 is fixed on the fixed seat 3. A contact wheel 321 is installed on the fixed column 32 through a bearing. The contact wheel 321 rolls in the rolling groove on the vertical rod 316. The upper ends of the two vertical rods 316 are both installed with top seats 3161 through bolts. A top rod 317 is installed between the two top seats 3161 through bolts. A suspension rod 3171 is installed on the top rod 317 through bolts. The lower end of the suspension rod 3171 is installed with a top knife 318 through bolts. Two lifting rods 33 slide on the fixed seat 3. The lower ends of the two lifting rods 33 are both installed with rollers. The rollers are in contact with the cams 311. The upper ends of the two lifting rods 33 are fixed with bottom knives 331. Heating tubes 332 are fixed inside both the bottom knife 331 and the top knife 318. Its function is: running the third motor 313 makes the bottom rod 31 rotate. The cams 311 on the bottom rod 31 push the rollers at the lower ends of the lifting rods 33, making the bottom knife 331 reciprocate up and down. At the same time, the eccentric wheels 314 drive the connecting seats 315 to move, making the vertical rods 316 reciprocate up and down, realizing the reciprocating movement of the top knife 318. The bottom knife 331 and the top knife 318 approach each other, realizing the heat sealing of the composite film.

[0049] The working principle of this embodiment: running the first motor 151 makes the bottom roller 12 rotate. Rotating the second handwheel 142 raises the height of the material trough 144. The material trough 144 is used to store the anti - sticking coating. The anti - sticking coating is applied to the bottom roller 12 through the material trough 144. Extending the second hydraulic rod 131 makes the top roller 133 press down on the bottom roller 12, realizing the leveling of the composite film. The upper layer of the composite film is sprayed with coating through the nozzle 241. Running the second motor 221 adjusts the position of the nozzle 241 to improve the uniformity of the coating application. Running the third motor 313 makes the bottom rod 31 rotate. The cams 311 on the bottom rod 31 push the rollers at the lower ends of the lifting rods 33, making the bottom knife 331 reciprocate up and down. At the same time, the eccentric wheels 314 drive the connecting seats 315 to move, making the vertical rods 316 reciprocate up and down, realizing the reciprocating movement of the top knife 318. The bottom knife 331 and the top knife 318 approach each other, realizing the heat sealing of the composite film.

[0050] In this article, the following points need to be noted:

[0051] 1. The attached drawings of the embodiments of this disclosure only involve the structures related to the embodiments of this disclosure. Other structures can refer to the general design.

[0052] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments.

[0053] The above are only the specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure.

Claims

1. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife, comprising: The bracket (1) is characterized in that: Two groups of support plates (11) are fixed at the upper end of the bracket (1), a rotating rod (111) is installed between the two groups of support plates (11) via a bearing, a worm wheel and a gear are fixed on the rotating rod (111), and a round rod (112) is fixed between the two groups of support plates (11), two groups of mounting seats (113) are installed on the round rod (112) and the rotating rod (111), a No. 1 toothed rod (114) is movable in the mounting seat (113), the gear on the rotating rod (111) is meshed with the No. 1 toothed rod (114), a worm is installed on the mounting seat (113) near the rear end of the rotating rod (111) via a bearing, a No. 1 handwheel (115) is fixed on the worm, the worm is meshed with the worm wheel on the rotating rod (111), and a connecting tube (115) is fixed on the upper ends of the two groups of No. 1 toothed rods (114). 16), a connecting rod (1161) is fixed between the two groups of connecting cylinders (116), a cylinder seat (1162) is installed on the connecting rod (1161) by bolts, a No. 1 hydraulic rod (1164) is hinged on the cylinder seat (1162), and a movable seat (1163) is installed on the connecting rod (1161), the piston rod of the No. 1 hydraulic rod (1164) is connected to the movable seat (1163) by a pin shaft, and an adjustment plate (117) is installed on the two groups of movable seats (1163) by bolts, and a waist groove is provided on the adjustment plate (117), and an adjustment screw (1172) is installed on the two groups of movable seats (1163) by bearings, and the adjustment screw (1172) is threadedly matched with the adjustment plate (117), and a scraper (1171) is installed on the adjustment plate (117) by bolts.

2. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 1, characterized in that: A gear seat (14) is fixed on the inner wall of the two groups of support plates (11), a rotating column (141) is installed between the two groups of gear seats (14) through a bearing, two groups of gears are fixed on the rotating column (141), the two groups of gears are respectively located in the two groups of gear seats (14), and a second tooth groove rod (143) is movable in the two groups of gear seats (14), the gear on the rotating column (141) is meshed with the second tooth groove rod (143), and a material trough (144) is fixed at the upper end of the two groups of second tooth groove rods (143).

3. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 2, characterized in that: A worm gear is fixed on the rotating column (141), a second hand wheel (142) is installed on the support plate (11) near the rear end of the bracket (1) via a bearing, a worm is fixed on the second hand wheel (142), the worm on the second hand wheel (142) is meshed with the worm gear on the rotating column (141), a bottom roller (12) is installed between the two groups of support plates (11) via a bearing, and a movable plate (13) is slidably provided on both groups of support plates (11), a second hydraulic rod (131) is installed on the upper ends of both groups of support plates (11) via bolts, the lower end of the piston rod of the second hydraulic rod (131) is connected to the upper end of the movable plate (13), a center rod (132) is installed between the two groups of movable plates (13) via bolts, and a top roller (133) is installed on the center rod (132) via a bearing.

4. The composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 3, characterized in that: A support seat (15) is installed on the support plate (11) near the front end of the bracket (1) by bolts, a No. 1 motor (151) is installed on the support seat (15) by bolts, a pulley is fixed on the output shaft of the No. 1 motor (151), and a side seat (152) is installed on the support plate (11) by bolts, a transmission rod (1521) is installed on the side seat (152) by bearings, a pulley and a gear are fixed on the transmission rod (1521), the transmission rod (1521) is connected to the output shaft of the No. 1 motor (151) by a belt, a gear is fixed on the rotating shaft of the bottom roller (12), and the gear on the bottom roller (12) is meshed with the gear on the transmission rod (1521).

5. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 4, characterized in that: An intermediate frame (2) is welded to the right side of the bracket (1), a first plate (21) and a second plate (22) are fixed to the intermediate frame (2), a cross bar (23) is installed between the first plate (21) and the second plate (22) by bolts, a movable seat (24) is movably provided on the cross bar (23), a pulley is installed at the front end of the cross bar (23), a second motor (221) is installed on the second plate (22) by bolts, a pulley is fixed on the output shaft of the second motor (221), a transmission belt is connected between the two sets of pulleys, the movable seat (24) is connected to the transmission belt by screws, and a nozzle (241) is installed on the movable seat (24) by bolts.

6. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 5, characterized in that: A fixing seat (3) is welded to the right side of the intermediate frame (2); a bottom rod (31) is mounted on the fixing seat (3) via a bearing; two groups of cams (311) and two groups of eccentric wheels (314) are fixed on the bottom rod (31); a gearbox (312) is mounted on the fixing seat (3) via bolts; a third motor (313) is mounted on the gearbox (312) via bolts; and an output end of the gearbox (312) is connected to the bottom rod (31).

7. A composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 6, characterized in that: The two groups of eccentric wheels (314) on the bottom rod (31) are sleeved with a connecting seat (315), the upper end of the connecting seat (315) is hinged with a vertical rod (316), and a rolling groove is arranged on the vertical rod (316). A fixing column (32) is fixed on the fixing seat (3), and a contact wheel (321) is installed on the fixing column (32) via a bearing, and the contact wheel (321) rolls in the rolling groove on the vertical rod (316). The upper ends of the two groups of vertical rods (316) are both installed with a top seat (3161) via bolts, and a top rod (317) is installed between the two groups of top seats (3161) via bolts, a suspension rod (3171) is installed on the top rod (317) via bolts, and a top knife (318) is installed at the lower end of the suspension rod (3171) via bolts.

8. The composite bag pretreatment device for preventing a single-material composite film from adhering to a hot knife according to claim 7, characterized in that: Two groups of lifting rods (33) are slidably mounted on the fixed seat (3); rollers are mounted at the lower ends of the two groups of lifting rods (33); the rollers are in contact with the cams (311); bottom knives (331) are fixed at the upper ends of the two groups of lifting rods (33); heating tubes (332) are fixed inside the bottom knife (331) and the top knife (318).

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