A co-extrusion film forming mechanism and a co-extrusion film blowing machine

Abstract

The present application relates to a kind of co-extrusion film forming mechanism and co-extrusion film blowing machine, co-extrusion film forming mechanism includes frame, guide structure and two groups of cleaning structure;Guide structure includes two guide parts of being arranged in frame, two guide parts are spaced apart, and each guide part is close to the side of another guide part and is equipped with guide surface, two guide surfaces gradually close to along material conveying direction, and form guide gap;Two groups of cleaning structure correspond to two guide parts respectively, each group of cleaning structure includes cleaning part and cleaning drive part, cleaning part has cleaning surface, and can be active along the direction of intersecting with material conveying direction, cleaning part drive part is driven connection with cleaning part, so that cleaning surface has the cleaning stroke of being attached to guide surface, and has the avoidance stroke of being staggered guide surface and being located outside guide gap.This scheme effectively cleans the dust on the guide surface, avoids the incorporation of impurities when co-extrusion film is extruded into shape, while saving labor, reducing cost, and the overall structure is compact, saves space.

Description

Technical Field

[0001] This invention relates to the field of co-extrusion film production equipment technology, and in particular to a co-extrusion film forming mechanism and a co-extrusion blown film machine. Background Technology

[0002] With the rapid development of technology and the progress of the times, the plastic products industry has also begun to develop rapidly. Blow molding machines, as the most common machines in the production and processing of plastic products, have a wide range of applications and advantages such as convenient maintenance and high processing speed. The production and processing of blow molding machines is usually divided into multiple processes such as blowing, forming, and winding. In the winding process, guide roller modules are used to straighten the film or other plastic products before winding them up, thereby achieving a flat and fast winding for subsequent storage and transportation.

[0003] For example, patent CN 108748964 A discloses a high-precision co-extrusion blown film machine, which blows molten raw materials into a cylindrical shape through a blown film structure. The cylindrical material is extruded into a thin film shape by the guide plate and extrusion roller of the traction mechanism to form a co-extruded film, and finally wound into a warehouse by a winding structure.

[0004] If impurities are introduced into the co-extruded film during extrusion molding, it will seriously affect its quality. Therefore, it is necessary to ensure that the contact surface of the material is clean before extrusion molding, that is, to ensure that the contact surface between the guide plate and the material is free of dust before production. However, the existing technology does not have a corresponding cleaning structure, requiring manual cleaning before production, which increases the labor intensity. Summary of the Invention

[0005] In view of this, it is necessary to provide a co-extrusion film forming mechanism and a co-extrusion blown film machine to solve the technical problem that the existing technology does not have a matching cleaning structure, which requires manual cleaning before production and increases the labor intensity.

[0006] This invention provides a co-extrusion film forming mechanism, the co-extrusion film forming mechanism comprising:

[0007] frame;

[0008] The guiding structure includes two guide portions disposed on the frame, the two guide portions being spaced apart, and each guide portion having a guide surface on the side closest to the other guide portion; the two guide surfaces gradually approach each other along the material conveying direction, forming a guide gap; and,

[0009] Two sets of cleaning structures are provided, each corresponding to one of the two guide sections. Each set of cleaning structures includes a cleaning section and a cleaning drive section. The cleaning section has a cleaning surface for cleaning the guide surface and is movable in a direction intersecting the material conveying direction. The cleaning drive section is driven to the cleaning section and is used to drive the cleaning section to move in a direction intersecting the material conveying direction, so that the cleaning surface has a cleaning stroke that conforms to the guide surface and an avoidance stroke that is offset from the guide surface and located outside the guide gap.

[0010] Optionally, the guide portion includes a clearance plate and a guide plate, the clearance plate and the guide plate being arranged along a direction intersecting the material conveying direction, wherein the guide surface is formed on the side of the guide plate near the other guide plate;

[0011] The cleaning section moves back and forth between the avoidance plate and the guide plate, allowing the cleaning surface to switch between the cleaning stroke and the avoidance stroke.

[0012] Optionally, the guide portion forms a drive channel that extends between the clearance plate and the guide plate, and the drive channel is open on the side near the guide surface;

[0013] The cleaning part is a cleaning plate located on one side of the guide surface. The cleaning plate extends toward the drive channel and is provided with a drive plate. The drive plate is movably disposed in the drive channel and is provided with a drive screw hole along the extension direction of the drive channel. The cleaning surface is located on the side of the cleaning plate close to the guide surface.

[0014] The cleaning drive unit includes a cleaning motor and a cleaning screw. The cleaning motor is located on the clearance plate, and the cleaning screw is located at the output end of the cleaning motor and passes through the drive screw hole. When rotating, the drive plate is driven to move along the extension direction of the drive channel, so that the cleaning plate can move back and forth between the clearance plate and the guide plate.

[0015] Optionally, the guide plate includes a mounting plate and a contact plate, the mounting plate being disposed on the frame, and the contact plate being detachably disposed on the side of the mounting plate near another contact plate, wherein the guide surface is formed on the side of the contact plate away from the corresponding mounting plate.

[0016] Optionally, the mounting plate has a slot along its thickness direction, and the contact plate has a protrusion facing the slot, which engages with the slot, so that the contact plate and the mounting plate are detachably connected.

[0017] Optionally, the sidewall of the slot is provided with a card hole along the direction intersecting the material conveying direction, and the card protrusion is provided with a connecting hole corresponding to the card hole;

[0018] The guide structure also includes a limiting rod, which is inserted into the connecting hole from the card hole to prevent the card protrusion from disengaging from the card slot.

[0019] Optionally, the contact plate includes a plurality of splicing plates arranged along the material conveying direction, and each splicing plate is detachably connected to the mounting plate.

[0020] Optionally, the frame includes a fixed frame and a movable frame. The fixed frame is provided with a guide position and an extrusion position in the vertical direction. The extrusion position is used to install an extrusion roller. The movable frame is movably disposed on the fixed frame in the vertical direction and located at the guide position. The guide part is disposed on the movable frame so that the distance between the guide part and the extrusion position is adjustable when the movable frame moves.

[0021] The co-extrusion film forming mechanism further includes a lifting drive unit, which is disposed on the fixed frame and drivenly connected to the movable frame to drive the movable frame to move in the vertical direction.

[0022] Optionally, the guide structure further includes an adjusting seat, a rotation drive unit, and an adjustment drive unit. The adjusting seat is disposed on the frame and is movably arranged along the layout direction of the two guide parts. The rotation drive unit is disposed on the adjusting seat and is drivenly connected to the guide parts to drive the guide parts to rotate around their axes, so that the tilt angle of the guide surface is adjustable. The axial direction of the guide parts is the same as the movement direction of the cleaning part. The adjustment drive unit is disposed on the frame and is drivenly connected to the adjusting seat to drive the adjusting seat to move along the layout direction of the two guide parts.

[0023] In addition, the present invention also provides a co-extrusion blown film machine, which includes the co-extrusion film forming mechanism as described in any of the above claims.

[0024] Compared with existing technologies, the co-extrusion film forming mechanism provided by this invention, before production, is driven by a cleaning drive unit to move in a direction intersecting with the material conveying direction. During the movement of the cleaning unit, the cleaning surface has a cleaning stroke to clean the guide surface, and also an avoidance stroke to be offset from the guide surface and located outside the guide gap. When the cleaning surface is in the cleaning stroke, it can fit against the guide surface to clean it during movement, preventing dust accumulation on the guide surface. After the guide surface is cleaned, the cleaning drive unit switches the cleaning surface to the avoidance stroke, that is, moves the cleaning unit outside the guide gap, preventing the cleaning unit from interfering with the material conveying and ensuring smooth material flow. Thus, this solution effectively cleans dust from the guide surface, preventing impurities from being introduced during co-extrusion film forming, while also saving labor, reducing costs, and having a compact overall structure that saves space.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of a structure of an embodiment of the co-extrusion film forming mechanism provided by the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the co-extrusion film forming mechanism from another angle;

[0029] Figure 3 for Figure 2 A three-dimensional schematic diagram of the guide structure and the cleaning structure;

[0030] Figure 4 for Figure 3 Front view of the guide structure and cleaning structure;

[0031] Figure 5 for Figure 3 Structural diagram of the mounting plate and clearance plate;

[0032] Figure 6 for Figure 5 A structural schematic diagram of the mounting plate and clearance plate from another angle;

[0033] Figure 7 for Figure 2 Schematic diagram of the structure of the cleaning section;

[0034] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0035] Figure 9 for Figure 6 Schematic diagram of the splicing panel;

[0036] Figure 10 for Figure 2 Schematic diagram of the middle connecting plate and limiting rod;

[0037] Figure 11 for Figure 6 Enlarged view of point B in the middle;

[0038] Figure 12 for Figure 2 A structural schematic diagram of the movable frame, the rotation drive unit, and the adjustment drive unit;

[0039] Figure 13 for Figure 13 Schematic diagram of the structure of the center adjustment seat;

[0040] Figure 14 This is a schematic diagram of the ash collection hopper of the co-extrusion film forming mechanism provided by the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Co-extrusion film forming mechanism; 1. Frame; 1a. Guide position; 1b. Extrusion position; 11. Fixed frame; 111. Guide rod; 12. Movable frame; 12a. Movable screw hole; 12b. Movable guide hole; 12c. Guide groove; 2. Guide structure; 21. Guide part; 21a. Guide gap; 21b. Drive channel; 211. Guide surface; 212. Clearance plate; 213. Guide plate; 214. Mounting plate; 214a. Slot; 214b. Slot; 214c. Limiting groove; 215. Contact plate; 2151. Slot protrusion; 2151a. Connecting hole; 216. Splicing plate; 217. Hook; 22. Limiting rod; 23. 1. Connecting plate; 231. Limiting protrusion; 24. Adjusting seat; 24a. Adjusting screw hole; 241. Guide slider; 25. Rotation drive unit; 251. Rotation motor; 26. Adjustment drive unit; 261. Adjusting screw; 3. Cleaning structure; 31. Cleaning unit; 311. Cleaning surface; 312. Cleaning plate; 313. Drive plate; 313a. Drive screw hole; 314. Brush; 32. Cleaning drive unit; 321. Cleaning motor; 322. Cleaning screw; 4. Extrusion roller; 5. Lifting drive unit; 51. Lifting motor; 52. Lifting screw; 6. Ash hopper; 61. Ash seat; 61a. Insertion groove; 62. Insertion plate; 63. Hanging rope. Detailed Implementation

[0043] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0044] Please see Figures 1 to 14The co-extrusion film forming mechanism 100 includes a frame 1, a guide structure 2, and two sets of cleaning structures 3. The guide structure 2 includes two guide parts 21 disposed on the frame 1. The two guide parts 21 are spaced apart, and each guide part 21 has a guide surface 211 on the side close to the other guide part 21. The two guide surfaces 211 gradually approach each other along the material conveying direction and form a guide gap 21a. The two sets of cleaning structures 3 correspond to the two guide parts 21 respectively. Each set of cleaning structures 3 includes a cleaning part 31 and a cleaning drive part 32. The cleaning part 31 has a cleaning surface 311 for cleaning the guide surface 211 and can move in a direction intersecting with the material conveying direction. The cleaning part 31 drive part is driven to drive the cleaning part 31 to move in a direction intersecting with the material conveying direction, so that the cleaning surface 311 has a cleaning stroke that fits against the guide surface 211 and an avoidance stroke that is offset from the guide surface 211 and located outside the guide gap 21a.

[0045] Before production, the co-extrusion film forming mechanism 100 provided by this invention drives the cleaning section 31 to move in a direction intersecting with the material conveying direction via the cleaning drive section 32. During the movement, the cleaning surface 311 has a cleaning stroke that cleans the guide surface 211, and also an avoidance stroke that is offset from the guide surface 211 and located outside the guide gap 21a. When the cleaning surface 311 is in the cleaning stroke, it can fit against the guide surface 211 to clean it during movement, preventing dust accumulation on the guide surface 211. After the guide surface 211 is cleaned, the cleaning drive section 32 switches the cleaning surface 311 to the avoidance stroke, that is, moves the cleaning section 31 outside the guide gap 21a, preventing the cleaning section 31 from interfering with the material conveying and ensuring smooth material flow. Thus, this solution effectively cleans dust from the guide surface 211, preventing impurities from being introduced during co-extrusion film forming, while also saving labor, reducing costs, and having a compact overall structure that saves space. It should be noted that in the example drawings, the material conveying direction is shown as F1, and the movement direction of the cleaning unit 31 is shown as F2.

[0046] Furthermore, the guide section 21 includes a clearance plate 212 and a guide plate 213, which are arranged along a direction intersecting the material conveying direction. A guide surface 211 is formed on the side of the guide plate 213 closest to another guide plate 213. The cleaning section 31 moves back and forth between the clearance plate 212 and the guide plate 213, allowing the cleaning surface 311 to switch between a cleaning stroke and a clearance stroke. In this design, when the cleaning section 31 moves within the area corresponding to the guide plate 213, the cleaning surface 311 adheres to the guide surface 211 to clean it. When the cleaning section 31 moves within the area corresponding to the clearance plate 212, it is offset from the guide surface 211, moving outside the guide gap 21a to avoid affecting material conveying. The structure is simple and reliable.

[0047] Furthermore, the guide section 21 has a drive channel 21b extending between the buffer plate 212 and the guide plate 213, with the drive channel 21b open on the side near the guide surface 211; the cleaning section 31 is a cleaning plate 312 located on one side of the guide surface 211, with a drive plate 313 extending from the cleaning plate 312 toward the drive channel 21b, the drive plate 313 movably disposed in the drive channel 21b, and having a drive screw hole 313a along the extending direction of the drive channel 21b. 311 is located on the side of the cleaning plate 312 near the guide surface 211; the cleaning drive unit 32 includes a cleaning motor 321 and a cleaning screw 322. The cleaning motor 321 is located on the clearance plate 212, and the cleaning screw 322 is located at the output end of the cleaning motor 321 and passes through the drive screw hole 313a, so that when rotating, it drives the drive plate 313 to move along the extension direction of the drive channel 21b, so that the cleaning plate 312 can move back and forth between the clearance plate 212 and the guide plate 213.

[0048] In this embodiment, when the output end of the cleaning motor 321 rotates, it drives the cleaning screw 322 to rotate, thereby driving the drive plate 313 to move along the extension direction of the drive channel 21b, realizing the switching of the cleaning surface 311 between the cleaning stroke and the avoidance stroke. It should be noted that in this solution, the cleaning surface 311 is provided with a brush 314 to ensure the cleaning ability of the cleaning part 31 on the guide surface 211.

[0049] Furthermore, the guide plate 213 includes a mounting plate 214 and a contact plate 215. The mounting plate 214 is mounted on the frame 1, and the contact plate 215 is detachably mounted on the side of the mounting plate 214 near another contact plate 215. A guide surface 211 is formed on the side of the contact plate 215 away from the corresponding mounting plate 214. To avoid scratches on the guide surface 211 caused by the cleaning surface 311 during long-term cleaning, which would adversely affect the film surface quality, in this solution, the contact plate 215 is detachably connected to the mounting plate 214, and the guide surface 211 is formed on the contact plate 215. This allows for easy replacement of the contact plate 215 when the guide surface 211 is scratched, thus saving costs while ensuring film quality. Specifically, a clearance plate 212 is connected to the mounting plate 214 and sequentially connected to the mounting plate 214 along the direction of movement of the cleaning section 31. That is, the clearance plate 212 extends beside the mounting plate 214. (See attached drawing). Figure 5 The area to the left of the dotted line is the clearance plate 212, and the area to the right is the mounting plate 214.

[0050] Furthermore, the mounting plate 214 has a groove 214a formed along its thickness direction, and the contact plate 215 has a protrusion 2151 protruding towards the groove 214a. The protrusion 2151 engages within the groove 214a, allowing the contact plate 215 to be detachably connected to the mounting plate 214. In this embodiment, the contact plate 215 is detachably mounted on the mounting plate 214 through the cooperation of the protrusion 2151 and the groove 214a, resulting in a simple structure and easy operation.

[0051] Specifically, the side wall of the slot 214a is provided with a slotting hole 214b in the direction intersecting the material conveying direction, and the protrusion 2151 is provided with a connecting hole 2151a corresponding to the slotting hole 214b; the guide structure 2 also includes a limiting rod 22, which is inserted from the slotting hole 214b into the connecting hole 2151a to prevent the protrusion 2151 from disengaging from the slot 214a. In this solution, the limiting rod 22 is inserted from the slotting hole 214b into the connecting hole 2151a on the protrusion 2151 to prevent the protrusion 2151 from disengaging from the slot 214a, thereby improving the installation stability of the contact plate 215.

[0052] Furthermore, the contact plate 215 includes multiple splicing plates 216 arranged along the material conveying direction, each splicing plate 216 being detachably connected to the mounting plate 214. In this embodiment, the contact plate 215 is configured with multiple splicing plates 216 so that when a scratch appears in a certain area of ​​the guide surface 211, the splicing plate 216 in the corresponding area can be replaced, avoiding the need to replace the entire contact plate 215, thus saving costs. Specifically, the mounting plate 214 is provided with multiple slots 214a spaced apart along the material conveying direction, each slot 214a corresponding to a single splicing plate 216, and each splicing plate 216 has a protruding protrusion 2151 facing the corresponding slot 214a, the protrusion 2151 engaging with the corresponding slot 214a, so that each splicing plate 216 is detachably mounted on the mounting plate 214. Specifically, in this embodiment, four splicing plates 216 are provided.

[0053] In addition, the guide structure 2 also includes a connecting plate 23. Multiple limiting rods 22 corresponding to the splicing plates 216 are connected to the connecting plate 23. These limiting rods 22 are spaced apart along the material conveying direction on the connecting plate 23, facilitating simultaneous insertion of multiple limiting rods 22 into the corresponding locking holes 214b and connecting holes 2151a, thus improving convenience. Furthermore, the mounting plate 214 has limiting grooves 214c at both ends, and the corresponding connecting plate 23 has limiting protrusions 231 corresponding to the limiting grooves 214c. When the limiting rods 22 are inserted into the corresponding locking holes 214b and connecting holes 2151a, the limiting protrusions 231 are engaged within the limiting grooves 214c to prevent the limiting rods 22 from disengaging from the locking holes 214b, thereby improving stability.

[0054] It should be noted that, in order to facilitate the operator in handling the wound co-extruded film and to shorten the length of the co-extruded film between the extrusion roller 4 and the winding mechanism, in practical applications, the extrusion roller 4 is placed at the lower end of the guide structure 2, that is, the guide position 1a is set above the extrusion position 1b. Based on this setting, in order to prevent dust from the cleaned surface 311 on the guide surface 211 from falling onto the extrusion roller 4, in this solution, the frame 1 includes a fixed frame 11 and a movable frame 12. The fixed frame 11 is provided with a guide position 1a and an extrusion position 1b in the vertical direction. The extrusion position 1b is used to install the extrusion roller 4. The movable frame 12 is movably disposed in the fixed frame 11 in the vertical direction and is located at the guide position 1a. The guide part 21 is disposed in the movable frame 12 so that the distance between the guide part 21 and the extrusion position 1b is adjustable when the movable frame 12 moves. The co-extruded film forming mechanism 100 also includes a lifting drive part 5, which is disposed in the fixed frame 11 and drivenly connected to the movable frame 12 to drive the movable frame 12 to move in the vertical direction.

[0055] Thus, before the cleaning unit 31 cleans the guide surface 211, the movable frame 12 is driven to rise by the lifting drive unit 5 to increase the distance between the guide surface 21 and the extrusion roller 4. This facilitates the placement of the dust collection hopper 6 below the guide surface 21 to catch the dust swept off the guide surface 211, preventing dust from falling onto the extrusion roller 4 and improving overall cleanliness. After the guide surface 211 is cleaned, the dust collection hopper 6 is removed, and the movable frame 12 is driven to descend by the lifting drive unit 5 to adjust the distance between the guide surface 21 and the extrusion roller 4 to a preset value.

[0056] Specifically, in this embodiment, the movable frame 12 has a movable screw hole 12a extending vertically. The lifting drive unit 5 includes a lifting motor 51 and a lifting screw 52. The lifting motor 51 is mounted on the fixed frame 11 and is drivenly connected to the lifting screw 52. The lifting screw 52 passes through the movable screw hole 12a to drive the movable frame 12 to move vertically during rotation. Furthermore, it should be noted that the movable frame 12 also has a movable guide hole 12b extending vertically. The fixed frame 11 extends a guide rod 111 corresponding to the movable guide hole 12b, and the guide rod 111 passes through the movable guide hole 12b. Additionally, in this embodiment, two movable frames 12 are provided, located on opposite sides of the guide portion 21 to improve stability.

[0057] Furthermore, the guide structure 2 also includes an adjustment seat, a rotation drive unit 25, and an adjustment drive unit 26. The adjustment seat is located on the frame 1 and is movably arranged along the arrangement direction of the two guide parts 21. The rotation drive unit 25 is located on the adjustment seat and is drivenly connected to the guide parts 21 to drive the guide parts 21 to rotate around their axis, so that the tilt angle of the guide surface 211 is adjustable. The axial direction of the guide parts 21 is the same as the direction of movement of the cleaning part 31. The adjustment drive unit 26 is located on the frame 1 and is drivenly connected to the adjustment seat to drive the adjustment seat to move along the arrangement direction of the two guide parts 21.

[0058] In this embodiment, the distance between the two guide sections 21 can be adjusted by moving the adjustment seat through the drive unit 26, thus making the guide gap 21a adjustable. This allows for flexible adjustment based on the material size, improving practicality. Furthermore, the guide section 21 can be rotated by rotating the drive unit 25 to adjust the tilt angle of the guide surface 211, thereby changing the degree of material guidance. That is, the degree of tapering of the guide gap 21a can be adjusted according to the material's physicochemical properties, preventing the guide gap 21a from tightening too quickly and causing material compression damage when the guide surface 211 guides the material, further ensuring the quality of the co-extruded film. It should be noted that in the example drawings, the arrangement direction of the two guide sections 21 is shown as F3.

[0059] Specifically, based on the above embodiment, the movable frame 12 is provided with two guide grooves 12c spaced apart along the arrangement direction of the two guide portions 21, and the two guide grooves 12c correspond to the two guide portions 21. Two adjusting seats correspond one-to-one with the two guide grooves 12c, and each adjusting seat is provided with a guide slider 241 corresponding to the guide groove 12c. The guide slider 241 is slidably disposed within the corresponding guide groove 12c. Furthermore, each adjusting seat is provided with an adjusting screw hole 24a along the arrangement direction of the two guide portions 21. The adjusting drive unit 26 is an adjusting screw 261, which is rotatably disposed on the movable frame 12 and passes through the adjusting screw hole 24a, so that it can drive the adjusting seat to move along the arrangement direction of the two guide portions 21 when rotating. In addition, the rotation drive unit 25 is a rotation motor 251 disposed on the adjusting seat, and the output end of the rotation motor 251 is connected to the guide portion 21, so as to drive the guide portion 21 to rotate when rotating.

[0060] Correspondingly, when the distance between the two guide parts 21 is adjustable, the co-extrusion film forming mechanism 100 in this solution also includes an ash hopper 6. The ash hopper 6 includes two ash seats 61, and the two ash seats 61 are recessed with ash troughs. Each ash trough is open on one side facing the other ash trough, so that the two ash troughs are interconnected to form the ash hopper 6's ash cavity. One of the two ash seats 61 is protruding with a connecting plate 62 facing the other ash seat 61. Correspondingly, the other ash seat 61 is recessed with a connecting groove 61a corresponding to the connecting plate 62. The connecting plate 62 is movably inserted into the connecting groove 61a. The two ash seats 61 and the connecting plate 62 together form the ash cavity of the ash hopper 6, so that the ash cavity of the ash hopper 6 is adjustable. Specifically, the ash collection seat 61 is provided with a hanging rope 63, and the two guide parts 21 are provided with hooks 217 on the side away from the guide gap 21a, so that the ash collection hopper 6 can be hung on the guide part 21 when cleaning the ash, so as to ensure effective ash collection.

[0061] Furthermore, the present invention also provides a co-extrusion blown film machine, which includes the co-extrusion film forming mechanism 100 as described in any of the above claims. It should be noted that the detailed structure of the co-extrusion film forming mechanism 100 of the co-extrusion blown film machine can be referred to the embodiments of the co-extrusion film forming mechanism 100 described above, and will not be repeated here. Since the co-extrusion film forming mechanism 100 described above is used in the co-extrusion blown film machine of the present invention, the embodiments of the co-extrusion blown film machine of the present invention include all the technical solutions of all the embodiments of the co-extrusion film forming mechanism 100 described above, and the achieved technical effects are also completely the same, and will not be repeated here.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A co-extrusion film forming mechanism, characterized in that, It includes: frame; The guiding structure includes two guide portions disposed on the frame, the two guide portions being spaced apart, and each guide portion having a guide surface on the side closest to the other guide portion; the two guide surfaces gradually approach each other along the material conveying direction, forming a guide gap; and, Two sets of cleaning structures are provided, each corresponding to one of the two guide sections. Each set of cleaning structures includes a cleaning section and a cleaning drive section. The cleaning section has a cleaning surface for cleaning the guide surface and is movable in a direction intersecting with the material conveying direction. The cleaning drive section is driven to the cleaning section and is used to drive the cleaning section to move in a direction intersecting with the material conveying direction, so that the cleaning surface has a cleaning stroke that fits the guide surface and an avoidance stroke that is offset from the guide surface and located outside the guide gap. The ash hopper includes two ash collection seats, each with a recessed ash collection groove. Each ash collection groove is open to the side facing the other ash collection groove, so that the two ash collection grooves are connected to each other to form the ash collection cavity of the ash hopper. The frame includes a fixed frame and a movable frame. The fixed frame is provided with a guide position and an extrusion position in the vertical direction. The extrusion position is used to install an extrusion roller. The movable frame is movably disposed on the fixed frame in the vertical direction and located at the guide position. The guide part is disposed on the movable frame so that the distance between the guide part and the extrusion position is adjustable when the movable frame moves. A lifting drive unit is provided on the fixed frame and drivenly connected to the movable frame to drive the movable frame to move in the vertical direction.

2. The co-extrusion film forming mechanism according to claim 1, characterized in that, The guide portion includes a clearance plate and a guide plate, the clearance plate and the guide plate being arranged in a direction intersecting the material conveying direction, wherein the guide surface is formed on the side of the guide plate near the other guide plate; The cleaning section moves back and forth between the avoidance plate and the guide plate, allowing the cleaning surface to switch between the cleaning stroke and the avoidance stroke.

3. The co-extrusion film forming mechanism according to claim 2, characterized in that, The guide portion forms a drive channel that runs through the clearance plate and the guide plate, and the drive channel is open on the side near the guide surface; The cleaning part is a cleaning plate located on one side of the guide surface. The cleaning plate extends toward the drive channel and is provided with a drive plate. The drive plate is movably disposed in the drive channel and is provided with a drive screw hole along the extension direction of the drive channel. The cleaning surface is located on the side of the cleaning plate close to the guide surface. The cleaning drive unit includes a cleaning motor and a cleaning screw. The cleaning motor is located on the clearance plate, and the cleaning screw is located at the output end of the cleaning motor and passes through the drive screw hole. When rotating, the drive plate is driven to move along the extension direction of the drive channel, so that the cleaning plate can move back and forth between the clearance plate and the guide plate.

4. The co-extrusion film forming mechanism according to claim 2, characterized in that, The guide plate includes a mounting plate and a contact plate. The mounting plate is disposed on the frame, and the contact plate is detachably disposed on the side of the mounting plate near another contact plate. The guide surface is formed on the side of the contact plate away from the corresponding mounting plate.

5. The co-extrusion film forming mechanism according to claim 4, characterized in that, The mounting plate has a slot along its thickness direction, and the contact plate has a protrusion facing the slot. The protrusion engages with the slot, making the contact plate and the mounting plate detachably connected.

6. The co-extrusion film forming mechanism according to claim 5, characterized in that, The sidewall of the slot is provided with a card hole along the direction intersecting the material conveying direction, and the card protrusion is provided with a connecting hole corresponding to the card hole; The guide structure also includes a limiting rod, which is inserted into the connecting hole from the card hole to prevent the card protrusion from disengaging from the card slot.

7. The co-extrusion film forming mechanism according to any one of claims 4 to 6, characterized in that, The contact plate includes multiple splicing plates arranged along the material conveying direction, and each splicing plate is detachably connected to the mounting plate.

8. The co-extrusion film forming mechanism according to claim 1, characterized in that, The guide structure further includes an adjustment seat, a rotation drive unit, and an adjustment drive unit. The adjustment seat is disposed on the frame and is movably arranged along the layout direction of the two guide parts. The rotation drive unit is disposed on the adjustment seat and is drivenly connected to the guide parts to drive the guide parts to rotate around their axes, so that the tilt angle of the guide surface is adjustable. The axial direction of the guide parts is the same as the movement direction of the cleaning part. The adjustment drive unit is disposed on the frame and is drivenly connected to the adjustment seat to drive the adjustment seat to move along the layout direction of the two guide parts.

9. A co-extrusion blown film machine, characterized in that, It includes a co-extrusion film forming mechanism as described in any one of claims 1 to 8.

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