Surface film laminating device for plastic packaging bag processing

Abstract

The invention discloses a surface film laminating device for plastic packaging bag processing, which comprises four vertically and symmetrically arranged support frames, a deviation rectifying assembly, an adjusting assembly and a pressing assembly, an unwinding roller is rotatably connected between the opposite support frames on one side in a penetrating manner, and a winding roller is rotatably connected between the opposite support frames on the other side in a penetrating manner; the two vertical ends, close to the unwinding roller, of the supporting frame on the same side are fixedly connected with transverse rods. Through the arrangement of the deviation rectifying assembly, the device can adapt to film covering operation of plastic bags with different widths, and meanwhile deviation rectifying is conducted on the unwinding direction of the plastic bags; by arranging the adjusting assembly, the laminating effect of the film and the base material is improved by controlling the angle of the film entering the heating roller; and by arranging the pressing and covering assembly, the film and the base material are subjected to heating pressing and cooling curing, and the film covering quality of the device is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of surface coating, in particular to a surface coating device for processing plastic packaging bags. Background Art

[0002] In the processing of plastic packaging bags, the surface laminating process is an important step. Laminating can improve the tear resistance, abrasion resistance and puncture resistance of the packaging bag, and at the same time make the packaging bag have good waterproof and moisture-proof properties, protecting the internal products from moisture.

[0003] After searching, the Chinese patent with publication number CN116373320B includes a base, a reeling unit is fixedly installed on one side of the upper surface of the base, the reeling unit is used to place the packaging film to be laminated, a dust suction unit is provided on one side of the reeling unit, the dust suction unit is used to clean the packaging film before gluing, a scraping unit is fixedly installed on the other side of the upper surface of the base, the scraping unit is used to scrape bubbles on the surface of the composite packaging film after gluing, so as to avoid bubbles and wrinkles on the surface of the packaging film, a wiping unit is provided on one side of the scraping unit, the wiping unit is used to wipe both sides of the packaging film, so as to avoid glue overflow on the sides of the packaging film.

[0004] In this case, by setting up an adjustment plate and a rotating drum, the laminating operation of packaging films of different widths is realized. At the same time, the device has the laminating function of switching between single-sided and double-sided film, which can meet various needs, and the double-sided laminating operation of the packaging film is carried out simultaneously, thereby improving the laminating processing efficiency of the packaging film; by turning on the motor to drive the connecting rod to rotate, the rotation of the connecting rod drives the cam to rotate, and the rotation of the cam drives the moving plate and the scraper to synchronously scrape off bubbles and remove wrinkles on both sides of the packaging film.

[0005] However, although this case has the laminating function of adapting to the width of the plastic film, the single glue output of the gluing unit is a fixed value, which easily leads to excessive glue output, resulting in waste and affecting the laminating quality of the device; at the same time, during the unwinding process of the packaging bag in this case, due to the inconsistent tension stress on its surface, it is easy to cause warping problems on both sides of the bag body; and when the width of the packaging bag is narrow, the unwinding process is likely to cause it to deviate, further resulting in a decrease in the subsequent laminating effect. Summary of the invention

[0006] The purpose of the present invention is to provide a surface coating device for processing plastic packaging bags, which has the advantages of width adaptation and deviation-correcting coating and solves the problems raised in the background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a surface coating device for processing plastic packaging bags, comprising four vertically symmetrically arranged support frames, a deviation correction component, an adjustment component and a pressing component, wherein a reeling roller is penetrated and rotatably connected between the support frames on one side, and a winding roller is penetrated and rotatably connected between the support frames on the other side, and both vertical ends of the support frames on the same side near the reeling roller are fixedly connected with cross bars, and one end of the cross bar on the same side away from the reeling roller is penetrated at equal intervals and rotatably connected with a rotating shaft, and both ends of the vertically opposite rotating shafts are sleeved with fixed rods, and a rubber roller is fixedly connected between the cross bars near the reeling roller; The deviation correction component includes two horizontally symmetrically arranged guide grooves, and the device is adapted to plastic bag substrates of different widths by adjusting the horizontal distance between the guide grooves, and the guide grooves are used to limit and correct the deviation of both sides of the substrate; The adjustment component includes two film material rollers arranged vertically and symmetrically, and the angle between the film material and the substrate is changed by controlling the positions of the film material rollers without affecting the tension of the film material itself; The laminating assembly includes two vertically symmetrically distributed heating rollers, which heat and pressurize the film material and the substrate, and cool and solidify the laminating plastic bag to stabilize the laminating effect.

[0008] Preferably, the away sides of the two guide grooves extend toward the bottom end and are fixedly connected with threaded rings, the axis centers of the two threaded rings are penetrated and screwed with threaded portions, the two threaded portions have opposite rotation directions and an adjusting shaft is fixedly connected at the axis center, the two ends of the adjusting shaft penetrate and are rotatably connected to the opposite surfaces of the bottom cross bar, the opposite surfaces of the cross bar are fixedly connected with limit frames that are penetrated and rotatably connected to the two ends of the adjusting shaft, and the top of the limit frame is provided with a working groove that adapts to the reciprocating sliding of the guide groove.

[0009] Preferably, the adjustment assembly further comprises an arc-shaped plate, the arc-shaped plate is fixedly connected to the vertical sides of the support frame near the unwinding roller, the two ends of the arc-shaped plate are provided with limiting grooves, and the inner contour of the limiting groove is provided with a bevel tooth portion engaged with the film material roller; The two ends of the two film material rollers extend out of the limit grooves, which are penetrated and rotatably connected with a follower part, and the opposite surfaces of the two follower parts are penetrated and slidably connected with a control rod, and a return spring arranged inside the control rod is fixedly connected between the control rod and the follower part.

[0010] Preferably, the bevel teeth are distributed around the limiting groove and the teeth of the bevel teeth at two vertical ends are oriented in opposite directions, and the central angle of the arc plate is located at the geometric center of the pressing assembly.

[0011] Preferably, the axis of the heating roller is penetrated and fixedly connected to the outer contours of the two rotating shafts on the side close to the unwinding roller, and both ends of the two rotating shafts on the side close to the unwinding roller are fixedly connected to transmission wheels 1, the two transmission wheels 1 are meshed with each other, and a driving wheel is meshed on the outer contour of the top transmission wheel 1, and the axis of the driving wheel is penetrated and fixedly connected to the driving shaft; The bottom end of the driving wheel is meshed with two transmission wheels 2 in sequence on one side away from the transmission wheel 1. The transmission wheels 2 are meshed with each other and are limited in rotation at their axes and are connected to the two ends of two rotating shafts close to the winding roller. Cooling rollers are fixedly connected to the outer contours of the middle sections of the two rotating shafts close to the winding roller.

[0012] Preferably, the rotation direction of the driving shaft is set to clockwise and the position is fixed, and the center distance between the two transmission wheels 1 and 2 is equal to the axial length of the fixed rod.

[0013] Preferably, a sliding member is connected between the cross bars in a limited sliding manner, a glue outlet groove is provided in the middle of the sliding member, cavities are provided inside both vertical ends of the sliding member, and two symmetrically distributed extrusion plates are slidably connected to the inner contour of the cavity.

[0014] Preferably, the top ends of the two guide grooves are fixedly connected with connecting rod frames, the middle sections of the two connecting rod frames extend downward near the sliding member and are fixedly connected to the extrusion plate, the middle sections of the two connecting rod frames are sleeved on the outer contour of the drive shaft, and the two connecting rod frames extend toward the bottom at one end away from the guide groove and are provided with a cutting head portion, and the blade of the cutting head portion points between the two cooling rollers.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a deviation correction component so that the device can adapt to the laminating operation of plastic bags of different widths and correct the unwinding direction of the plastic bags, thereby avoiding the reduction of laminating quality due to unwinding deviation.

[0016] The present invention improves the lamination effect between the film and the substrate by setting an adjustment component and controlling the angle at which the film enters the heating roller, and has the function of corresponding adjustment according to actual conditions, thereby ensuring uniform tension of the film during the lamination process, preventing deformation and stretching of the film, and ensuring a good lamination effect.

[0017] The present invention provides a pressing component to heat and press the film and the substrate and cool and solidify them, thereby improving the film coating quality of the device and saving the time required for natural cooling, thereby effectively improving the film coating quality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2This is a schematic diagram of the support structure of the present invention; Figure 3 This is an exploded schematic diagram of the structure of the deviation-correcting component of the present invention; Figure 4 A schematic diagram of the connection relationship between the adjustment assembly and the support frame of the present invention; Figure 5 It is a cross-sectional view of the structure of the adjustment component of the present invention; Figure 6 This is a schematic diagram of the structure of the pressing assembly of the present invention; Figure 7 It is a cross-sectional view of the gluing mechanism structure of the present invention; Figure 8 It is a schematic diagram of the connection relationship between the deviation-correcting component and the gluing mechanism of the present invention; Fig. 9 It is the overall workflow diagram of the present invention.

[0019] In the figure: 1. support frame; 11. unwinding roller; 12. winding roller; 13. cross bar; 14. rotating shaft; 15. fixing rod; 16. rubber roller; 2. adjusting shaft; 21. threaded part; 22. limiting frame; 23. threaded ring; 24. guide groove; 3. sliding member; 31. cavity; 32. glue outlet groove; 33. extrusion plate; 4. arc plate; 41. limiting groove; 42. bevel gear part; 5. control rod; 51. follower; 52. film material roller; 53. reset spring; 6. driving shaft; 61. driving wheel; 62. transmission wheel one; 63. transmission wheel two; 64. heating roller; 65. cooling roller; 7. connecting rod frame; 71. knife head. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1

[0022] See also Figures 1 to 9The present invention provides a technical solution: a surface coating device for processing plastic packaging bags, comprising four vertically symmetrically arranged support frames 1, a deviation correction component, an adjustment component and a pressing component, wherein a reel 11 is penetrated and rotatably connected between the support frames 1 on one side, and a reel 12 is penetrated and rotatably connected between the support frames 1 on the other side, and both vertical ends of the support frames 1 on the same side near the reel 11 are fixedly connected with cross bars 13, and one end of the cross bar 13 on the same side away from the reel 11 is penetrated at equal intervals and rotatably connected with a rotating shaft 14, and both ends of the vertically opposite rotating shaft 14 are sleeved with fixed rods 15, and a rubber roller 16 is fixedly connected between the cross bars 13 near the reel 11; The deviation correction component includes two horizontally symmetrically arranged guide grooves 24. The device can adapt to plastic bag substrates of different widths by adjusting the horizontal distance between the guide grooves 24, and the guide grooves 24 are used to limit and correct the deviation of both sides of the substrate. The adjustment assembly includes two film material rollers 52 arranged vertically and symmetrically, and the angle between the film material and the substrate is changed by controlling the positions of the film material rollers 52 without affecting the tension of the film material itself; The laminating assembly includes two vertically symmetrically distributed heating rollers 64 , which heat and pressurize the film material and the substrate, and cool and solidify the laminating plastic bag to stabilize the laminating effect.

[0023] In this device, the substrate to be coated is firstly wound on the surface of the unwinding roller 11, and the free end of the substrate is successively passed through the deviation correction component and the pressing component and finally wound on the surface of the winding roller 12. At this time, the same-direction rotation of the unwinding roller 11 and the winding roller 12 can realize the subsequent coating operation on the winding and unwinding of the substrate. Along with the movement of the substrate, the rubber roller 16 fully wipes the upper and lower surfaces of the substrate to realize the cleaning operation before gluing. The cross bar 13 and the rotating shaft 14 provide limiting support for the pressing component, and the fixed rod 15 controls the pore size between the pressing components to avoid the reduction of the coating quality due to too low pressure.

[0024] The horizontal distance between the guide grooves 24 is controlled by adjusting the deflection correction assembly to be equal to the width of the substrate. At this time, the substrate contacts the guide grooves 24 and the guide grooves 24 are used to limit and guide the two ends of the substrate, thereby completing the deflection correction operation of the substrate.

[0025] Then the substrate and the film material enter the laminating assembly at the same time. The laminating assembly makes the substrate and the film material fully adhere to each other and the adhesive is fully softened under the action of heating to realize the laminating operation. The plastic bag after lamination is fully cooled so that the adhesive re-solidifies to stabilize the laminating effect.

[0026] Example 2

[0027] See also Figure 3This embodiment further illustrates the following on the basis of the first embodiment: The away sides of the two guide grooves 24 extend toward the bottom end and are fixedly connected with a threaded ring 23. The axis centers of the two threaded rings 23 are penetrated and screwed with a threaded portion 21. The rotation directions of the two threaded portions 21 are opposite and an adjusting shaft 2 is fixedly connected at the axis center. The two ends of the adjusting shaft 2 penetrate and are rotatably connected to the opposite surfaces of the bottom cross bar 13. The opposite surfaces of the cross bar 13 are fixedly connected with a limit frame 22 that is penetrated and rotatably connected to the two ends of the adjusting shaft 2. The top of the limit frame 22 is provided with a working groove that adapts to the reciprocating sliding of the guide groove 24.

[0028] When it is necessary to adapt the width of the substrate, the operator rotates the adjusting shaft 2, and the adjusting shaft 2 drives the two threaded parts 21 to rotate synchronously, and the threaded part 21 is screwed with the threaded ring 23 and the rotation directions of the two threaded parts 21 are opposite, that is, at this time, the two threaded rings 23 tend to rotate spirally together with the threaded part 21, and the threaded ring 23 is fixedly connected with the guide groove 24, and the guide groove 24 is limited and guided by the working groove at the top of the limited position frame 22, so that the threaded ring 23 and the guide groove 24 cannot rotate, and can only move horizontally along the axial direction of the limit frame 22, and the movement directions of the two guide grooves 24 are opposite, that is, when the adjusting shaft 2 is rotated clockwise, the two guide grooves 24 approach each other, and when the adjusting shaft 2 is rotated counterclockwise, the two guide grooves 24 move away from each other, so that the horizontal distance between the two guide grooves 24 can be adjusted by rotating the adjusting shaft 2 to adapt it to the width of the substrate, and after adaptation, the opposite surfaces of the guide grooves 24 contact the two ends of the substrate.

[0029] It can be seen from Example 1 that the same-direction rotation of the unwinding roller 11 and the winding roller 12 causes the substrate to move. At this time, the tension stresses at various locations on the substrate are inconsistent. If the stress in the middle part of the substrate is too large, it will cause its deformation to be greater than that at both ends. At this time, the two sides of the substrate will warp upward; and if the stress in the middle part of the substrate is too small, it will cause the deformation at both ends to be greater than that in the middle. At this time, the two sides of the substrate will curl downward.

[0030] Since the two ends of the substrate are in direct contact with the opposite surfaces of the guide groove 24, that is, the deformation of the two ends of the substrate will cause the traction direction of the guide groove 24 to change, and the opposite surface of the guide groove 24 adopts an arc surface design, which can effectively alleviate the traction force of the substrate on the guide groove 24, thereby reducing the deformation degree of the two ends of the substrate and reducing the probability of wrinkles in subsequent operations.

[0031] On the other hand, when the unwinding direction of the substrate is offset, the degree of extrusion of the substrate on the offset side on the guide groove 24 increases, and the end of the substrate begins to curl up and down under the guidance of the arc surface of the guide groove 24 and drives it to separate from the unwinding roller 11. At this time, the stress on the corresponding side of the guide groove 24 on the unwinding roller 11 is reduced, while the stress on the other side of the guide groove 24 remains unchanged, so that the offset guide groove 24 is offset to the other side again and finally achieves intermediate reset.

[0032] Example 3

[0033] See also Figure 4-Figure 5 This embodiment further illustrates the following on the basis of the second embodiment: The adjustment assembly further includes an arc plate 4, which is fixedly connected to the vertical sides of the support frame 1 near the unwinding roller 11, and has limiting grooves 41 at both ends thereof, and a bevel tooth portion 42 engaged with the film material roller 52 is provided on the inner contour of the limiting groove 41; The two ends of the two film material rollers 52 extend out of the limit grooves 41 and are penetrated and rotatably connected with a follower part 51, and the opposite surfaces of the two follower parts 51 are penetrated and slidably connected with a control rod 5, and a return spring 53 arranged inside the control rod 5 is fixedly connected between the control rod 5 and the follower part 51.

[0034] The bevel teeth 42 are distributed around the limiting groove 41 and the teeth of the bevel teeth 42 at two vertical ends are in opposite directions. The central angle of the arc plate 4 is located at the geometric center of the pressing component.

[0035] When the device is in use, the film material is wound around the surface of the corresponding film material roller 52 according to actual needs and its free end is introduced into the pressing assembly. At this time, the position of the film material roller 52 is adjusted accordingly to change the angle between the film material and the substrate without affecting the tension of the film material itself, thereby ensuring uniform tension of the film material during the lamination process, preventing deformation and stretching of the film material, and improving the lamination quality of the device.

[0036] When it is necessary to synchronously adjust the positions of the upper and lower film rollers 52, the operator moves the control rod 5 horizontally to the corresponding position. At this time, the control rod 5 drives the follower part 51 to move horizontally synchronously. The follower part 51 synchronously retracts and contracts on the guide of the limiting groove 41 and stretches the reset spring 53. The stretched reset spring 53 makes the follower part 51 tend to shrink inwardly, and the follower part 51 is connected to the film roller 52 for limiting rotation. The inward shrinkage trend of the follower part 51 makes the film roller 52 and the bevel tooth part 42 clamped together, thereby realizing the fixed state of the film roller 52.

[0037] When it is necessary to adjust the position of a certain film material roller 52, the operator stretches the follower part 51 on the corresponding side outward and controls it to slide to the expected position in the limiting groove 41 on the corresponding side. At this time, the stretching of the follower part 51 is released and the film material roller 52 is fixed again, thereby ensuring that the adjustment component has the functions of synchronous adjustment and separate adjustment.

[0038] Example 4

[0039] See also Figure 6 This embodiment further illustrates the following on the basis of the third embodiment: The axis of the heating roller 64 is penetrated and fixedly connected to the outer contours of the two rotating shafts 14 on the side close to the unwinding roller 11. Both ends of the two rotating shafts 14 on the side close to the unwinding roller 11 are fixedly connected to transmission wheels 1 62. The two transmission wheels 1 62 are meshed with each other and the outer contour of the top transmission wheel 1 62 is meshed with a driving wheel 61. The axis of the driving wheel 61 is penetrated and fixedly connected to the driving shaft 6. Two transmission wheels 63 are meshed in sequence on the side of the bottom end of the driving wheel 61 away from the transmission wheel 1 62. The transmission wheels 63 are meshed with each other and are limited in rotation at the axes and are connected to the two ends of the two rotating shafts 14 close to the winding roller 12. A cooling roller 65 is fixedly connected to the outer contour of the middle section of the two rotating shafts 14 close to the winding roller 12.

[0040] The rotation direction of the driving shaft 6 is set to be clockwise and the position is fixed. The center distance between the two transmission wheels 1 62 and 2 63 is equal to the axial length of the fixing rod 15 .

[0041] During the laminating operation, the driving shaft 6 drives the driving wheel 61 to rotate. At this time, the top transmission wheel 1 62 rotates in opposite directions to the transmission wheel 2 63 and the driving wheel 61, while the bottom transmission wheel 1 62 rotates in the same direction as the transmission wheel 2 63 and the driving shaft 6. That is, the operator controls the driving shaft 6 to rotate clockwise through an external motor, and the top heating roller 64 and the cooling roller 65 rotate counterclockwise synchronously, while the bottom heating roller 64 and the cooling roller 65 rotate clockwise.

[0042] At this time, the relative rotation between the two heating rollers 64 will further guide the substrate and the film material into the interior of the pressing assembly and achieve full adhesion between the substrate and the film material under the extrusion between the two heating rollers 64. At this time, the heating of the heating rollers 64 will fully soften the adhesive between the substrate and the film material so that the film material is firmly adhered to the surface of the substrate; further, the filmed material enters between the two cooling rollers 65, and the two cooling rollers 65 further flatten the material and fully cool and solidify the adhesive to stabilize the filming effect.

[0043] Example 5

[0044] See also Figure 7-Figure 8 This embodiment further illustrates the following on the basis of the fourth embodiment: A sliding member 3 is connected between the cross bars 13 in a limited sliding manner. A glue outlet groove 32 is provided in the middle of the sliding member 3. A cavity 31 is provided inside both vertical ends of the sliding member 3. Two symmetrically distributed extrusion plates 33 are slidably connected to the inner contour of the cavity 31.

[0045] The top ends of the two guide grooves 24 are fixedly connected with a connecting rod frame 7, the middle sections of the two connecting rod frames 7 extend downward near the sliding member 3 and are fixedly connected to the extrusion plate 33, the middle sections of the two connecting rod frames 7 are sleeved on the outer contour of the drive shaft 6, and the ends of the two connecting rod frames 7 away from the guide grooves 24 extend toward the bottom and are provided with a cutting head portion 71, and the cutting edge of the cutting head portion 71 points to between the two cooling rollers 65.

[0046] Before the substrate enters the pressing assembly, the upper and lower surfaces of the substrate are coated with glue by the sliding member 3. The cavity 31 is pre-filled with adhesive, and the adhesive is evenly coated on the upper and lower surfaces of the substrate by friction between the substrate and the glue outlet groove 32 when the substrate moves.

[0047] It should be noted that when the guide groove 24 is adjusted to adapt to the width of the substrate, the guide groove 24 synchronously drives the connecting rod frame 7. At this time, the distance between the two connecting rod frames 7 is also adapted to the width of the substrate, that is, at this time, the distance between the two extrusion plates 33 is equal to the width of the substrate. The extrusion plate 33 limits the effective glue coating length of the glue outlet groove 32 to the width of the substrate, thereby effectively avoiding waste of adhesive.

[0048] On the other hand, some solidified adhesive may remain on both sides of the plastic bag after lamination, and the width between the two cutter heads 71 ​​also adapts to the width of the substrate under the action of the connecting rod frame 7, that is, at this time the cutter head 71 is in full contact with both sides of the plastic bag and scrapes off the excess adhesive.

[0049] 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 surface coating device for processing plastic packaging bags, comprising four vertically symmetrically arranged support frames (1), a deviation correction component, an adjustment component and a coating component, characterized in that: A reeling roller (11) is penetrated and rotatably connected between the supporting frames (1) on one side that are opposite to each other, and a winding roller (12) is penetrated and rotatably connected between the supporting frames (1) on the other side that are opposite to each other, and both vertical ends of the supporting frames (1) on the same side near the reeling roller (11) are fixedly connected to cross bars (13), and one end of the cross bar (13) on the same side that is away from the reeling roller (11) is penetrated at equal intervals and rotatably connected to a rotating shaft (14), and both ends of the vertically opposite rotating shaft (14) are sleeved with fixed rods (15), and a rubber roller (16) is fixedly connected between the cross bars (13) near the reeling roller (11); The deviation correction component comprises two horizontally symmetrically arranged guide grooves (24); the horizontal distance between the guide grooves (24) is adjusted so that the device can adapt to plastic bag substrates of different widths, and the guide grooves (24) are used to limit and correct the deviation of two sides of the substrate; The adjustment component comprises two film material rollers (52) arranged vertically and symmetrically, and the angle between the film material and the substrate is changed by controlling the positions of the film material rollers (52), while the tension of the film material itself is not affected; The laminating assembly comprises two vertically symmetrically distributed heating rollers (64), and the film material and the base material are heated and pressurized by the heating rollers (64), while the laminating plastic bag is cooled and solidified to stabilize the laminating effect.

2. The surface coating device for processing plastic packaging bags according to claim 1, characterized in that: The two guide grooves (24) have their sides facing away from each other extending toward the bottom end and are fixedly connected with a threaded ring (23); the two threaded rings (23) have their axes penetrated and screwed with a threaded portion (21); the two threaded portions (21) have opposite rotation directions and are fixedly connected with an adjustment shaft (2) at their axes; the two ends of the adjustment shaft (2) penetrate and are rotatably connected to the opposite surfaces of the bottom cross bar (13); the opposite surfaces of the cross bar (13) are fixedly connected with a limit frame (22) penetrated and rotatably connected to the two ends of the adjustment shaft (2); the top end of the limit frame (22) is provided with a working groove adapted to the guide groove (24) for reciprocating sliding.

3. The surface coating device for processing plastic packaging bags according to claim 1, characterized in that: The adjustment assembly further comprises an arc-shaped plate (4), wherein the arc-shaped plate (4) is fixedly connected to two vertical sides of the support frame (1) near the unwinding roller (11), and two ends of the arc-shaped plate (4) are provided with limiting grooves (41), and the inner contour of the limiting groove (41) is provided with a bevel tooth portion (42) that is engaged with the film material roller (52); The two ends of the two film material rollers (52) extend out of the limit grooves (41) and are both penetrated by and rotatably connected to a follower part (51), and the opposite surfaces of the two follower parts (51) are penetrated by and slidably connected to a control rod (5), and a return spring (53) arranged inside the control rod (5) is fixedly connected between the control rod (5) and the follower part (51).

4. The surface coating device for processing plastic packaging bags according to claim 3, characterized in that: The bevel tooth portions (42) are distributed around the inside of the limiting groove (41), and the teeth of the bevel tooth portions (42) at the two vertical ends face in opposite directions. The center angle of the arc plate (4) is located at the geometric center of the pressing component.

5. The surface coating device for processing plastic packaging bags according to claim 1, characterized in that: The axis of the heating roller (64) is penetrated and fixedly connected to the outer contours of the two rotating shafts (14) on the side close to the unwinding roller (11), and both ends of the two rotating shafts (14) on the side close to the unwinding roller (11) are fixedly connected to transmission wheels (62), the two transmission wheels (62) are meshed with each other, and the outer contour of the top transmission wheel (62) is meshed with a driving wheel (61), and the axis of the driving wheel (61) is penetrated and fixedly connected to the driving shaft (6); The bottom end of the driving wheel (61) is meshed with two transmission wheels (63) on one side away from the transmission wheel (62) in sequence. The transmission wheels (63) are meshed with each other and are rotationally limited at their axes to be connected to the two ends of two rotating shafts (14) on the side close to the winding roller (12). A cooling roller (65) is fixedly connected to the outer contour of the middle section of the two rotating shafts (14) on the side close to the winding roller (12).

6. The surface coating device for processing plastic packaging bags according to claim 5, characterized in that: The rotation direction of the drive shaft (6) is set to be clockwise and the position is fixed, and the center distance between the two transmission wheels (62) and (63) is equal to the axial length of the fixed rod (15).

7. The surface coating device for processing plastic packaging bags according to claim 1, characterized in that: A sliding member (3) is connected between the cross bars (13) in a limited sliding manner, a glue outlet groove (32) is provided in the middle of the sliding member (3), cavities (31) are provided inside both vertical ends of the sliding member (3), and two symmetrically distributed extrusion plates (33) are slidably connected to the inner contour of the cavity (31).

8. The surface coating device for processing plastic packaging bags according to claim 7, characterized in that: The top ends of the two guide grooves (24) are fixedly connected to a connecting rod frame (7), the middle sections of the two connecting rod frames (7) extend downward near the sliding member (3) and are fixedly connected to the extrusion plate (33), the middle sections of the two connecting rod frames (7) are sleeved on the outer contour of the drive shaft (6), and the ends of the two connecting rod frames (7) away from the guide grooves (24) extend toward the bottom and are provided with a knife head (71), and the blade of the knife head (71) points to between the two cooling rollers (65).

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