A casting film extrusion device with adjustable feed speed

Abstract

The application discloses a kind of adjustable feeding speed cast film extrusion device, it is related to plastic recycling technical field, including injection molding device, extrusion die, roller device, winding assembly, guide assembly and cold cutting self-stabilizing device.The application is sequentially arranged by setting adsorption hole area, shear hole area and slow-release hole area on cooling plate, and adsorption hole area and slow-release hole area are arranged in gradient respectively, so that cast film is subjected to gradually enhanced adsorption stabilizing effect before entering shear zone, avoid film body swing due to adsorption force mutation;At the same time, the larger total opening area of shear hole area can form stronger negative pressure adsorption force at the shear position, so that cast film keeps more stable adhering and moving state during shearing process, thereby improving shear stability and cutting edge precision;And slow-release hole area makes the adsorption force on cast film gradually weaken after scrap edge shearing, so as to inhibit the rapid rebound of main part after local tension is released.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, specifically to a cast film extrusion device with adjustable feeding speed. Background Technology

[0002] Cast film extrusion equipment is a molding device used to continuously process molten plastic into sheet films, widely used in packaging, electronics, medical, hygiene materials, and composite substrates. This type of equipment typically features continuous production, high film-forming efficiency, stable thickness control, and good film surface flatness. It is suitable for processing films of various thermoplastic materials and is an important piece of equipment in film product manufacturing.

[0003] In the process of waste edge cutting and recycling, existing equipment is prone to causing the cutting line to drift and the cutting resistance to fluctuate due to heat softening, swaying and unstable position. The pulling, vibration and stress release generated during cutting can also be easily transmitted to the main body of the cast film, which in turn causes the main film edge to shake, spring back, wrinkle residue or tension imbalance, affecting the quality of the cast film and the stability of subsequent processing. Summary of the Invention

[0004] The purpose of this invention is to provide a cast film extrusion device with adjustable feeding speed to solve the problem of unstable waste edge cutting of cast film in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casting film extrusion device with adjustable feeding speed, comprising an injection molding device and a cold-cutting self-stabilizing device, wherein an extrusion mold is installed on the injection molding device, a roller pressing device is installed on one side of the injection molding device, a guide assembly is installed on the roller pressing device, and a winding assembly is installed at one end of the roller pressing device.

[0006] The cold-cutting self-stabilizing device includes a front guide roller and a connecting frame. The front guide roller is rotatably mounted on the roller pressing device, and the connecting frame is mounted on the roller pressing device. Supports are symmetrically mounted on the connecting frame, and low-temperature adsorption components are mounted on the supports. Deflection tensioning components are mounted on the supports and are movably connected to the low-temperature adsorption components. Cutting components are mounted on the low-temperature adsorption components. A rear guide roller is rotatably mounted on the connecting frame, and auxiliary rollers are symmetrically and rotatably mounted on both sides of the rear guide roller.

[0007] The guiding assembly consists of several guide rollers used to guide the cast film. The rolling device utilizes the gap between the upper and lower pressure rollers to simultaneously extrude and shape the cast film, ensuring a stable thickness that meets the required production specifications. The winding assembly is used to wind up the processed cast film.

[0008] The extrusion unit is connected to a control box, which houses the control system used to operate the entire extrusion unit. The control system can increase the feeding speed by changing the injection speed of the injection molding unit.

[0009] During production, the control system first starts the injection molding device, which melts the raw material and extrudes it through the extrusion die. The extruded film is then squeezed by the guide roller and the roller pressing device, passes through the cold cutting self-stabilizing device, and is finally wound up on the winding assembly.

[0010] Furthermore, the deflection tensioning assembly includes a motor and two adjusting rods. The motor is mounted on a support, and a cross is mounted on the motor output shaft. The two adjusting rods are symmetrically mounted on the cross along the same circumferential trajectory. The adjusting rods are movably connected to the low-temperature adsorption assembly. Rollers are symmetrically and rotatably mounted on the adjusting rods, and a roller belt is installed between the rollers.

[0011] The motor output shaft synchronously drives two adjusting rods to deflect along a circular trajectory via a cross. When the adjusting rods deflect, they synchronously drive the rollers installed on them to deflect relative to the casting film conveying path, so that the two deflection tensioning components deflect synchronously to form an expansion angle that is narrow in the front and wide in the back.

[0012] As the two rollers deflect, they guide the cast film to expand outwards on both sides, changing the original straight-line transport trajectory of the cast film edge into an oblique trajectory that separates to both sides. This generates lateral tensile stress in the width direction of the cast film, causing the cast film to be continuously stretched to both sides during its passage.

[0013] An industrial camera is installed at the cold-cut self-stabilizing device to perform imaging and inspection of the cast film during operation.

[0014] When the cast film passes through the cold-cut self-stabilizing device, after the industrial camera detects transverse wrinkles in the cast film, the control system adjusts the opening and closing angles of the two deflection tensioning components according to the position, amplitude, or range of the wrinkles. This causes the cast film to be stretched and opened to both sides as it passes through the roller belt, following the deflection trend of the rollers. This prevents over-tensioning, thereby achieving adaptive unfolding and leveling of transverse wrinkles, reducing local wrinkle residue, and avoiding subsequent edge instability problems.

[0015] Furthermore, the low-temperature adsorption assembly includes a negative pressure box, which is mounted on a support. An adjusting rod is movably mounted inside the negative pressure box. An adsorption plate is mounted on the negative pressure box. A cooling plate is mounted on one side of the negative pressure box. A cutting assembly is mounted on one side of the cooling plate. The cooling plate is connected to a circulating cooling device through a pipe.

[0016] The circulating cooling device is used to circulate low-temperature coolant into the cooling channels.

[0017] Furthermore, the cooling plate is equipped with cooling channels, with an inlet and an outlet at each end of the cooling channels. Both the inlet and outlet are connected to the circulating cooling device through pipes.

[0018] The circulating cooling device supplies cryogenic coolant to the inlet through pipes. The coolant flows within the cooling channels and cools the cooling plates. The cryogenic cooling plates cool and absorb heat from the residual heat of the cast film waste edge above. The absorbed heat is carried away by the coolant through heat exchange. The heated coolant is discharged from the outlet and flows back into the circulating cooling device, where it is cooled before entering the next cycle. After cooling, the waste edge experiences a decrease in temperature and softening, resulting in a corresponding reduction in material plasticity. This improves the local rigidity and resistance to deformation in the edge area, making it less prone to stress avoidance, tensile deformation, or curling during shearing. This contributes to improved shearing stability and edge neatness.

[0019] Furthermore, the cutting assembly includes a cutting frame mounted on one side of a cooling plate. A rotating ring is rotatably mounted on the cutting frame, and a blade is mounted on the rotating ring. The blade abuts against an adsorption plate. An adjusting sleeve is mounted on the cutting frame, and a sliding rod is slidably mounted inside the adjusting sleeve. One end of the sliding rod is connected to the rotating ring. An electromagnet is mounted inside the adjusting sleeve, and a magnetic block is slidably mounted inside the adjusting sleeve. The magnetic block abuts against the electromagnet, and a spring is installed between the magnetic block and the sliding rod.

[0020] The blade and the adsorption plate are positioned to abut against each other. When the cast film passes between them, the blade and the adsorption plate work together to cut the cast film.

[0021] The spring continuously applies an elastic thrust to one end of the sliding rod, which pushes the rotating ring to form a deflection tendency, thereby causing the blade to always be biased towards the adsorption plate side, so that the blade is stably pressed against the surface of the adsorption plate to form a basic cutting preload.

[0022] When a thicker cast film needs to be cut, the control system controls the electromagnet to be energized. The electromagnet generates a magnetic field that repels the magnetic block. Under the action of the repulsive force, the magnetic block moves along the adjustment sleeve and further compresses the spring. As the spring compression increases, the thrust exerted by the spring on the sliding rod increases synchronously. Under the push of the sliding rod, the deflection tendency of the rotating ring is enhanced, so that the blade presses against the adsorption plate with a greater clamping force, thereby improving the cutting force between the blade and the adsorption plate, meeting the cutting requirements of thicker cast films, and realizing the adjustment of the cutting force.

[0023] Meanwhile, even if the blade wears down due to long-term cutting, the spring can still provide compensatory preload during blade use, allowing the blade to continue to effectively resist the suction plate after wear. This prevents the cutting gap from increasing, the cutting from being incomplete, or the cutting edge quality from decreasing due to blade wear, thus achieving automatic compensation for blade wear and maintaining a stable cutting effect.

[0024] Furthermore, the cooling plate is provided with an adsorption zone, a shearing zone, and a slow-release zone in sequence along the running direction of the cast film. The adsorption zone is provided with a number of adsorption holes, which are distributed in a gradient from few to many along the running direction of the cast film. The slow-release zone is provided with a number of slow-release holes, which are distributed in a gradient from many to few along the running direction of the cast film. The shearing zone is provided with a number of shearing holes, and the number of shearing holes is greater than that of the adsorption holes and the slow-release holes. The total open area of ​​the shearing zone is greater than that of the adsorption zone and the slow-release zone.

[0025] Because the adsorption pores are distributed in a gradient from few to many along the direction of film movement, the total open area of ​​the adsorption zone gradually increases, thereby gradually enhancing the negative pressure adsorption force on the film before it enters the shear zone. This results in a gradual adsorption stabilization effect on the film, preventing the film from being subjected to a sudden increase in adsorption force just before entering the shear zone, and reducing the swaying or instability of the film due to sudden changes in adsorption force.

[0026] The total open area of ​​the shearing zone is larger than that of the adsorption zone and the slow-release zone, which enables the shearing zone to form a stronger negative pressure adsorption effect. This allows the cast film to maintain a more stable adhesion and movement state at the shearing position, reducing film shaking, displacement or local warping during the shearing process, and improving the stability and cutting accuracy of the shearing process.

[0027] The slow-release pores are distributed in a gradient from multiple to at least along the direction of the cast film's movement, so that the adsorption force of the slow-release zone on the cast film gradually weakens along the running direction. When the waste edge of the cast film is sheared, the main body does not immediately lose its constraint after leaving the high adsorption shear zone. Instead, it is first continuously stabilized under the strong adsorption force of the slow-release zone, and then slowly released as the adsorption force gradually decreases. This suppresses the rapid rebound of the main body after the local tension is relieved, and promotes the smooth reset of the cast film and achieves a gradual transition of posture.

[0028] While the cast film is being stretched and wrinkled, the control system adjusts the blade pre-tension according to the desired film thickness. Then, the negative pressure device is activated, evacuating the negative pressure chamber and creating negative pressure suction at the adsorption holes, shearing holes, and slow-release holes above the chamber. The cast film first passes through the adsorption zone, where it is gradually and smoothly adsorbed onto the adsorption plate. Then, upon entering the shearing zone, the cooling plate pre-cools the waste material side, reducing its plasticity. The blade and adsorption plate then cut off the cooled waste edge of the cast film. The cut waste edge is wound onto the auxiliary roller, while the main material continues forward through the rear guide roller and is wound onto the winding assembly, thus completing the casting film processing.

[0029] Furthermore, the negative pressure box is equipped with a negative pressure chamber, which is connected to the adsorption pore, shearing pore and slow release pore.

[0030] The negative pressure chamber is connected to a negative pressure device via a pipe, which is used to evacuate the negative pressure chamber.

[0031] Furthermore, the adjusting rod includes an arc segment and a straight segment. The straight segment is symmetrically arranged at both ends of the arc segment. The roller is rotatably mounted on the straight segment. The two ends of the arc segment are connected to the cross, and the arc segment is rotatably connected to the negative pressure box.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. By synchronously deflecting two deflection tensioning components to form an expansion guide path that is narrower at the front and wider at the back, the edges of the cast film on both sides are guided outward during the conveying process, thereby establishing transverse tensile stress in the film width direction. This generates a continuous outward stretching effect on the transverse wrinkled areas, causing the wrinkles to gradually flatten and unfold. At the same time, in conjunction with an industrial camera to identify the wrinkles, the opening and closing angle of the deflection tensioning components is adjusted by the control system, so that the stretching and unfolding effect can be adjusted according to the position and degree of the wrinkles, thereby improving the flattening effect of transverse wrinkles, reducing wrinkle residue, and improving the stability of the subsequent edge cutting process.

[0034] 2. By continuously applying elastic thrust to the sliding rod through the spring, the blade is always kept in a pre-tightened state facing the adsorption plate, thereby ensuring a stable basic cutting force between the blade and the adsorption plate, which can achieve stable cutting of the cast film.

[0035] 3. When cutting thicker cast films, the repulsive force between the electromagnet and the magnetic block is used to further compress the spring, increasing the spring's thrust on the sliding rod. This simultaneously enhances the clamping force of the blade on the adsorption plate, thereby increasing the cutting force between the blade and the adsorption plate and enabling adaptive cutting adjustment for cast films of different thicknesses. Furthermore, the pre-tightening thrust continuously provided by the spring can automatically compensate for the contact relationship between the blade and the adsorption plate after the blade wears down, preventing the cutting gap from increasing, the cutting from being incomplete, or the edge quality from decreasing due to blade wear, thus maintaining a more stable cutting effect and edge quality.

[0036] 4. By sequentially setting adsorption pore areas, shearing pore areas, and slow-release pore areas on the cooling plate, and arranging the adsorption pore areas and slow-release pore areas in a gradient manner, the cast film can be subjected to a gradually enhanced adsorption stabilizing effect before entering the shearing zone, avoiding film swaying caused by sudden changes in adsorption force. At the same time, the larger total open area of ​​the shearing pore area can form a stronger negative pressure adsorption force at the shearing position, enabling the cast film to maintain a more stable adhesion and movement state during the shearing process, thereby improving shearing stability and edge cutting accuracy. Furthermore, the slow-release pore area gradually weakens the adsorption force on the cast film after the waste edge shearing, thereby suppressing the rapid rebound of the main body after the local tension is released, promoting the slow reset and smooth transition of the cast film, which is beneficial to improving the stability of subsequent conveying and edge quality.

[0037] 5. Cooling the waste edge with a cooling plate reduces its softening and material plasticity, thereby improving the local rigidity and resistance to deformation in the edge area. This makes it less prone to stress avoidance, tensile deformation, or curling and shrinkage during shearing, which helps to improve shearing stability and edge neatness. Attached Figure Description

[0038] Figure 1 This is an overall perspective view of the extrusion apparatus of the present invention;

[0039] Figure 2 This is a perspective view of the extrusion apparatus of the present invention;

[0040] Figure 3 For the present invention Figure 2 A magnified view of a portion of region A in the middle;

[0041] Figure 4 This is a perspective view of the cold-cutting self-stabilizing device of the present invention;

[0042] Figure 5 This is a perspective view of the low-temperature adsorption component, cutting component, and deflection tensioning component of the present invention;

[0043] Figure 6 The three-dimensional form of the deflection tensioning component of the present invention Figure 1 ;

[0044] Figure 7 The three-dimensional form of the deflection tensioning component of the present invention Figure 2 ;

[0045] Figure 8 This is a perspective view of the low-temperature adsorption component of the present invention;

[0046] Figure 9 This is a perspective view of the cutting component of the present invention;

[0047] Figure 10 This is a perspective view of the cooling plate of the present invention.

[0048] In the diagram: 1. Injection molding unit; 2. Extrusion die; 3. Roller pressing unit; 4. Rewinding assembly; 5. Guiding assembly; 6. Cold cutting self-stabilizing device; 61. Front guide roller; 62. Rear guide roller; 63. Connecting frame; 64. Support; 65. Low-temperature adsorption assembly; 66. Cutting assembly; 67. Deflection tensioning assembly; 68. Auxiliary roller; 651. Negative pressure box; 652. Adsorption plate; 653. Cooling plate; 6511. Negative pressure chamber; 6521. Suction... Attached area; 6522, shearing zone; 6523, slow-release zone; 6531, cooling channel; 661, cutting frame; 662, rotating ring; 663, blade; 664, adjusting sleeve; 665, spring; 666, magnetic block; 667, electromagnet; 668, sliding rod; 671, motor; 672, cross; 673, adjusting rod; 674, roller; 675, roller belt; 6731, curved segment; 6732, straight segment. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example: Figures 1-10 As shown, the present invention provides a technical solution: a casting film extrusion device with adjustable feeding speed, including an injection molding device 1 and a cold cutting self-stabilizing device 6. An extrusion mold 2 is installed on the injection molding device 1, a roller pressing device 3 is installed on one side of the injection molding device 1, a guide assembly 5 is installed on the roller pressing device 3, and a winding assembly 4 is installed at one end of the roller pressing device 3.

[0051] The cold-cutting self-stabilizing device 6 includes a front guide roller 61 and a connecting frame 63. The front guide roller 61 is rotatably mounted on the roller pressing device 3. The connecting frame 63 is mounted on the roller pressing device 3. Supports 64 are symmetrically mounted on the connecting frame 63. Low-temperature adsorption components 65 are mounted on the supports 64. A deflection tensioning component 67 is mounted on the supports 64. The deflection tensioning component 67 is movably connected to the low-temperature adsorption component 65. A cutting component 66 is mounted on the low-temperature adsorption component 65. A rear guide roller 62 is rotatably mounted on the connecting frame 63. Auxiliary rollers 68 are symmetrically and rotatably mounted on both sides of the rear guide roller 62.

[0052] The guiding assembly 5 consists of several guide rollers and is used to guide the cast film. The rolling device 3 uses the gap between the upper and lower pressure rollers to simultaneously extrude and shape the cast film, so that the thickness of the cast film is stable and meets the required production specifications. The winding assembly 4 is used to wind up the processed cast film.

[0053] The extrusion unit is connected to a control box, which houses a control system used to operate the entire extrusion unit. The control system can increase the feeding speed by changing the injection speed of the injection molding unit 1.

[0054] The deflection tensioning assembly 67 includes a motor 671 and two adjusting rods 673. The motor 671 is mounted on a support 64. A cross 672 is mounted on the output shaft of the motor 671. The two adjusting rods 673 are symmetrically mounted on the cross 672 along the same circumferential trajectory. The adjusting rods 673 are movably connected to the low-temperature adsorption assembly 65. Rollers 674 are symmetrically and rotatably mounted on the adjusting rods 673. A roller belt 675 is installed between the rollers 674.

[0055] The adjusting rod 673 includes an arc segment 6731 and a straight segment 6732. The straight segment 6732 is symmetrically arranged at both ends of the arc segment 6731. The roller 674 is rotatably mounted on the straight segment 6732. The two ends of the arc segment 6731 are connected to the cross 672. The arc segment 6731 is rotatably connected to the negative pressure box 651.

[0056] The output shaft of motor 671 drives two adjusting rods 673 to deflect along a circular trajectory via cross 672. When the adjusting rods 673 deflect, they drive the rollers 674 installed on them to deflect relative to the casting film conveying path, so that the two deflection tensioning components 67 deflect synchronously to form an expansion angle that is narrow in the front and wide in the back.

[0057] As the two rollers 675 deflect, they respectively form an outward expanding guiding effect on both sides of the cast film, changing the original straight-line conveying trajectory of the cast film edge into an oblique trajectory that separates to both sides. This generates lateral tensile stress in the width direction of the cast film, causing the cast film to be continuously subjected to tension that expands to both sides during the process.

[0058] The cold-cut self-stabilizing device is equipped with six industrial cameras for imaging and detection of the cast film during operation.

[0059] The low-temperature adsorption assembly 65 includes a negative pressure box 651, which is mounted on a support 64. An adjusting rod 673 is movably mounted inside the negative pressure box 651. An adsorption plate 652 is mounted on the negative pressure box 651. A cooling plate 653 is mounted on one side of the negative pressure box 651. A cutting assembly 66 is mounted on one side of the cooling plate 653. The cooling plate 653 is connected to a circulating cooling device through a pipe.

[0060] The circulating cooling device is used to circulate low-temperature coolant into the cooling channel 6531.

[0061] The cooling plate 653 is provided with an adsorption zone 6521, a shear zone 6522, and a slow-release zone 6523 in sequence along the running direction of the cast film. The adsorption zone 6521 is provided with a number of adsorption holes, which are distributed in a gradient from few to many along the running direction of the cast film. The slow-release zone 6523 is provided with a number of slow-release holes, which are distributed in a gradient from many to few along the running direction of the cast film. The shear zone 6522 is provided with a number of shear holes, and the number of shear holes is greater than that of the adsorption holes and the slow-release holes. The total open area of ​​the shear zone 6522 is greater than that of the adsorption zone 6521 and the slow-release zone 6523.

[0062] Because the adsorption pores are distributed in a gradient from few to many along the direction of film movement, the total open area of ​​the adsorption zone 6521 gradually increases, thereby gradually enhancing the negative pressure adsorption force on the film before it enters the shear zone 6522. This results in a gradual adsorption stabilization effect on the film, preventing the film from being subjected to a sudden increase in adsorption force just before entering the shear zone 6522, and reducing the film from swaying or becoming unstable due to sudden changes in adsorption force.

[0063] The total open area of ​​the shearing zone 6522 is larger than that of the adsorption zone 6521 and the slow-release zone 6523, which enables the shearing zone 6522 to form a stronger negative pressure adsorption effect. This allows the cast film to maintain a more stable attachment and movement state at the shearing position, reducing film shaking, displacement or local warping during the shearing process, and improving the stability and cutting accuracy of the shearing process.

[0064] The slow-release pores are distributed in a gradient of multiples to a minimum along the direction of casting film movement, so that the adsorption force of the slow-release zone 6523 on the casting film gradually weakens along the running direction. When the waste edge of the casting film is sheared, the main body does not immediately lose its constraint after leaving the high adsorption shear zone 6522. Instead, it is first continuously stabilized under the strong adsorption force of the slow-release zone 6523, and then slowly released as the adsorption force gradually decreases. This suppresses the rapid rebound of the main body after the local tension is relieved, and promotes the smooth reset of the casting film and achieves a gradual transition of posture.

[0065] The negative pressure box 651 has a negative pressure chamber 6511 inside, which is connected to the adsorption hole, the shearing hole and the slow release hole.

[0066] The negative pressure chamber 6511 is connected to a negative pressure device via a pipe. The negative pressure device is used to evacuate the negative pressure chamber 6511.

[0067] The cooling plate 653 is provided with a cooling channel 6531. The two ends of the cooling channel 6531 are the liquid inlet and the liquid outlet, respectively. Both the liquid inlet and the liquid outlet are connected to the circulating cooling device through pipes.

[0068] The circulating cooling device supplies low-temperature coolant to the inlet through pipes. The coolant flows within the cooling channel 6531 and cools the cooling plate 653. The low-temperature cooling plate 653 cools and absorbs heat from the residual heat of the cast film waste edge above it. The absorbed heat is carried away by the coolant through heat exchange. The heated coolant is discharged from the outlet and flows back into the circulating cooling device. After the circulating cooling device cools the coolant, it enters the next cycle. After cooling, the waste edge's temperature decreases, its softening degree weakens, and the material's plasticity decreases accordingly. The local rigidity and deformation resistance of the edge area are improved, making it less prone to stress avoidance, tensile deformation, or curling and shrinkage during shearing, which helps improve shearing stability and edge neatness.

[0069] The cutting assembly 66 includes a cutting frame 661, which is mounted on one side of the cooling plate 653. A rotating ring 662 is rotatably mounted on the cutting frame 661, and a blade 663 is mounted on the rotating ring 662. The blade 663 abuts against the adsorption plate 652. An adjusting sleeve 664 is mounted on the cutting frame 661. A sliding rod 668 is slidably mounted inside the adjusting sleeve 664. One end of the sliding rod 668 is connected to the rotating ring 662. An electromagnet 667 is mounted inside the adjusting sleeve 664. A magnetic block 666 is slidably mounted inside the adjusting sleeve 664. The magnetic block 666 abuts against the electromagnet 667. A spring 665 is installed between the magnetic block 666 and the sliding rod 668.

[0070] The blade 663 is set against the adsorption plate 652. When the cast film passes between the two, the blade 663 and the adsorption plate 652 cooperate to cut the cast film.

[0071] Spring 665 continuously applies elastic thrust to one end of sliding rod 668, and sliding rod 668 pushes rotating ring 662 to generate a deflection tendency, thereby causing blade 663 to always be biased towards the adsorption plate 652, so that blade 663 is stably pressed against the surface of adsorption plate 652 to form basic cutting preload.

[0072] When a thicker cast film needs to be cut, the control system energizes the electromagnet 667, which generates a magnetic field that repels the magnetic block 666. Under the action of the repulsive force, the magnetic block 666 moves along the adjusting sleeve 664 and further compresses the spring 665. As the compression of the spring 665 increases, the thrust exerted by the spring 665 on the sliding rod 668 increases synchronously. Under the push of the sliding rod 668, the deflection tendency of the rotating ring 662 is enhanced, causing the blade 663 to press against the adsorption plate 652 with a greater clamping force. This increases the cutting force between the blade 663 and the adsorption plate 652, meeting the cutting requirements of thicker cast films and realizing the adjustment of the cutting force.

[0073] Meanwhile, during the use of blade 663, even if the blade wears down due to long-term cutting, spring 665 can still provide compensating preload thrust, so that blade 663 can continue to effectively resist the suction plate 652 after wear, avoiding increased cutting gap, incomplete cutting or reduced cutting quality due to blade 663 wear, thereby achieving automatic compensation for blade 663 wear and maintaining stable cutting effect.

[0074] The working principle of this invention is as follows: During production, the control system first turns on the injection molding device 1. The injection molding device 1 melts the raw material and then extrudes it through the extrusion mold 2. The extruded cast film is squeezed by the guide roller and the roller pressing device 3, passes through the cold cutting self-stabilizing device 6, and is finally wound up on the winding assembly 4.

[0075] When the cast film passes through the cold-cut self-stabilizing device 6 from the guide roller 61, after the industrial camera detects transverse wrinkles in the cast film, the control system adjusts the opening and closing angles of the two deflection tensioning components 67 according to the position, amplitude, or range of the wrinkles. This causes the cast film to be stretched and opened to both sides with the deflection trend of the roller 674 when it passes through the roller belt 675, preventing over-tensioning. This achieves adaptive unfolding and leveling of transverse wrinkles, reduces local wrinkle residue, and avoids the problem of unstable cutting edges in the future.

[0076] While the cast film is being stretched and wrinkled, the control system adjusts the pre-tightness of the blade 663 according to the thickness of the film to be produced. Then, the negative pressure device is activated, which evacuates the negative pressure chamber 6511, causing the adsorption holes, shearing holes, and slow-release holes above the negative pressure chamber 6511 to generate negative pressure suction. The cast film first passes through the adsorption zone 6521 and is gradually and steadily adsorbed onto the adsorption plate 652. Then, when it enters the shearing zone 6522, the cooling plate 653 pre-cools the waste side. After cooling, the plasticity of the waste is reduced. The blade 663 and the adsorption plate 652 cut off the waste edge of the cooled cast film. The cut waste edge is wound onto the auxiliary roller 68, and the main material continues to pass forward through the rear guide roller 62 and is wound onto the winding assembly 4, thus completing the processing of the cast film.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A cast film extrusion device with adjustable feeding speed, characterized in that: The extrusion device includes an injection molding device (1) and a cold-cut self-stabilizing device (6). An extrusion mold (2) is installed on the injection molding device (1). A roller pressing device (3) is installed on one side of the injection molding device (1). A guide assembly (5) is installed on the roller pressing device (3). A winding assembly (4) is installed at one end of the roller pressing device (3). The cold-cutting self-stabilizing device (6) includes a front guide roller (61) and a connecting frame (63). The front guide roller (61) is rotatably mounted on the roller pressing device (3). The connecting frame (63) is mounted on the roller pressing device (3). Supports (64) are symmetrically mounted on the connecting frame (63). Low-temperature adsorption components (65) are mounted on the supports (64). Deflection tensioning components (67) are mounted on the supports (64). The deflection tensioning components (67) are movably connected to the low-temperature adsorption components (65). Cutting components (66) are mounted on the low-temperature adsorption components (65). A rear guide roller (62) is rotatably mounted on the connecting frame (63). Auxiliary rollers (68) are symmetrically and rotatably mounted on both sides of the rear guide roller (62).

2. The adjustable feeding speed cast film extrusion device according to claim 1, characterized in that: The deflection tensioning assembly (67) includes a motor (671) and two adjusting rods (673). The motor (671) is mounted on a support (64). A cross (672) is mounted on the output shaft of the motor (671). The two adjusting rods (673) are symmetrically mounted on the cross (672) along the same circumferential trajectory. The adjusting rods (673) are movably connected to the low-temperature adsorption assembly (65). Rollers (674) are symmetrically and rotatably mounted on the adjusting rods (673). A roller belt (675) is installed between the rollers (674).

3. The adjustable feeding speed cast film extrusion device according to claim 2, characterized in that: The low-temperature adsorption assembly (65) includes a negative pressure box (651), which is mounted on a support (64). The adjusting rod (673) is movably mounted inside the negative pressure box (651). An adsorption plate (652) is mounted on the negative pressure box (651). A cooling plate (653) is mounted on one side of the negative pressure box (651). The cutting assembly (66) is mounted on one side of the cooling plate (653). The cooling plate (653) is connected to a circulating cooling device through a pipe.

4. The adjustable feeding speed cast film extrusion device according to claim 3, characterized in that: The cooling plate (653) is provided with a cooling channel (6531), and the two ends of the cooling channel (6531) are an inlet and an outlet, respectively. The inlet and outlet are connected to the circulating cooling device through pipes.

5. The adjustable feeding speed cast film extrusion device according to claim 3, characterized in that: The cutting assembly (66) includes a cutting frame (661), which is mounted on one side of a cooling plate (653). A rotating ring (662) is rotatably mounted on the cutting frame (661), and a blade (663) is mounted on the rotating ring (662). The blade (663) abuts against the adsorption plate (652). An adjusting sleeve (664) is mounted on the cutting frame (661), and a sliding rod (668) is slidably mounted inside the adjusting sleeve (664). One end of the sliding rod (668) is connected to the rotating ring (662). An electromagnet (667) is mounted inside the adjusting sleeve (664), and a magnetic block (666) is slidably mounted inside the adjusting sleeve (664). The magnetic block (666) abuts against the electromagnet (667), and a spring (665) is installed between the magnetic block (666) and the sliding rod (668).

6. The adjustable feeding speed cast film extrusion device according to claim 3, characterized in that: The cooling plate (653) is provided with an adsorption zone (6521), a shear zone (6522), and a slow-release zone (6523) in sequence along the running direction of the cast film. The adsorption zone (6521) is provided with a plurality of adsorption holes, which are distributed in a gradient from few to many along the running direction of the cast film. The slow-release zone (6523) is provided with a plurality of slow-release holes, which are distributed in a gradient from many to few along the running direction of the cast film. The shear zone (6522) is provided with a plurality of shear holes, and the number of shear holes is greater than that of the adsorption holes and the slow-release holes. The total open area of ​​the shear zone (6522) is greater than that of the adsorption zone (6521) and the slow-release zone (6523).

7. The adjustable feeding speed cast film extrusion device according to claim 6, characterized in that: The negative pressure box (651) is provided with a negative pressure chamber (6511), which is connected to the adsorption hole, the shearing hole and the slow release hole.

8. The adjustable feeding speed cast film extrusion device according to claim 3, characterized in that: The adjusting rod (673) includes an arc segment (6731) and a straight segment (6732). The straight segment (6732) is symmetrically arranged at both ends of the arc segment (6731). The roller (674) is rotatably mounted on the straight segment (6732). The two ends of the arc segment (6731) are connected to the cross (672). The arc segment (6731) is rotatably connected to the negative pressure box (651).

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