Cast film machine with same edge cutting rate and rolling rate

Abstract

The invention discloses a cast film machine with the same edge cutting rate and rolling rate. The cast film machine comprises a material receiving assembly and an edge cutting assembly. A synchronous assembly is arranged between the material collecting assembly and the edge cutting assembly and comprises a driving wheel and a driven wheel, the driven wheel is a variable-diameter wheel, and the diameter of the driven wheel can be increased along with increase of the thickness of a material roll on the material collecting roller. The linear speed of the transmission surface on the driven wheel is consistent with the winding speed of the material receiving assembly; the linear speed of the driving wheel is consistent with the linear speed of the driven wheel through the transmission belt, so that the trimming rate of the trimming assembly is consistent with the winding rate of the receiving assembly; the synchronous assembly is introduced to connect the edge cutting roller and the material receiving roller, so that the linear speeds of the edge cutting roller and the material receiving roller are kept consistent. By means of the design, the problem that the edge cutting speed and the rolling speed in a traditional cast film machine are not matched is solved, and the problems that due to speed difference, the edge of a thin film is torn, waste is accumulated or the machine is stuck are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic film processing, and in particular relates to a cast film machine with the same trimming rate and winding rate. Background Art

[0002] Cast film machine is a kind of equipment specially used for producing plastic film. Its working principle is to extrude the molten plastic raw material through the die head and solidify it after rapid cooling to form a continuous thin film. However, in the actual production process, due to the influence of various factors, the edge area of ​​the film often has uneven thickness, that is, the edge may be thinner or thicker than the middle part, and the actual width of the film may exceed the predetermined size. To solve these problems, a side trimming device is usually installed in the production line to trim the unqualified edges of the film in real time to ensure that the width and thickness of the film meet the specified standards.

[0003] Furthermore, if the speed of the trimming device and the winding system cannot keep pace, a series of problems may occur: the edge of the film may be torn due to excessive stretching, affecting product quality; waste cannot be collected in time, which may cause accumulation or even machine jam; when the trimming rate is too fast, burrs or jagged damage may appear on the edge of the film; conversely, if the trimming rate is too slow, the edge of the film may not be trimmed thoroughly, which in turn affects subsequent processing links. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a cast film machine with the same trimming rate and winding rate, so as to solve the problems existing in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution of the present invention is a cast film machine with the same trimming rate and winding rate, the cast film machine includes a material receiving assembly with a material receiving roller and a trimming assembly with a trimming roller; a synchronization assembly is arranged between the material receiving assembly and the trimming assembly, the synchronization assembly includes a driving wheel, the driving wheel is connected to the trimming roller, the linear speed of the transmission surface on the driving wheel is consistent with the trimming rate of the trimming assembly; a driven wheel, the driven wheel is connected to the material receiving roller, the driven wheel is a variable diameter wheel, the diameter of the driven wheel can increase with the increase of the thickness of the material roll on the material receiving roller, so that the linear speed of the transmission surface on the driven wheel is consistent with the winding rate of the material receiving assembly; a transmission belt, the transmission belt connects the driving wheel and the driven wheel, so that the linear speed of the driving wheel is consistent with the linear speed of the driven wheel, so as to achieve the consistency of the trimming rate of the trimming assembly and the winding rate of the material receiving assembly.

[0006] Preferably, a tensioning wheel is added to the synchronization component to ensure the tension of the transmission belt when the cast film machine is running: the synchronization component also includes a tensioning wheel, and the tensioning wheel is used to control the tension of the transmission belt; when the diameter of the driven wheel changes with the thickness of the material roll on the receiving roller, the tension of the transmission belt is ensured to remain unchanged by changing the diameter of the tensioning wheel or changing the position of the tensioning wheel.

[0007] Furthermore, the variable diameter structure of the driven wheel is arranged as follows: the driven wheel is composed of a first wheel core and a first transmission member arranged in an arc shape on the outer side of the first wheel core, first fixing members are circumferentially equidistantly arranged on the outer periphery of the first wheel core, first sliding members connected to the first transmission member are arranged on the first fixing members, first adjusting members are rotatably arranged on the first sliding members, and all the first adjusting members are rotatably connected to the first control member; a first installation cavity is opened on the first wheel core, and the first control member is slidably arranged in the first installation cavity; the diameter of the driven wheel is controlled by adjusting the position of the control member on the first wheel core.

[0008] Further, when the tension of the transmission belt is controlled by changing the diameter of the tensioning wheel; the tensioning wheel is composed of a second wheel core and a second transmission member arranged in an arc shape on the outer side of the second wheel core, the outer periphery of the second wheel core is circumferentially equidistantly provided with second fixing members, the second fixing members are each provided with a second sliding member connected to the second transmission member, the second sliding members are each rotatably provided with a second adjusting member, and all the second adjusting members are rotatably connected to the second control member; a second installation cavity is opened on the second wheel core, and the second control member is slidably arranged in the second installation cavity; the diameter of the tensioning wheel is controlled by adjusting the positions of the two control members on the second wheel core;

[0009] Further, when the tension of the transmission belt is controlled by changing the position of the tensioning wheel; the tensioning wheel is arranged on a third sliding member, and the third sliding member is slidably arranged on a third fixed member; the position of the tensioning wheel is controlled by adjusting the position of the third sliding member on the third fixed member.

[0010] Furthermore, the control of the equipment is simplified to allow the adjustment of the synchronous driven wheel and the tension wheel: the synchronization component also includes a synchronization mechanism arranged between the driven wheel and the tension wheel, and the synchronization mechanism is composed of a piston tube and piston blocks arranged at both ends of the piston tube; the piston blocks are respectively a first piston block and a second piston block, the first piston block is connected to the first control member, and the second piston block is connected to the tension wheel; when controlling the diameter of the driven wheel, the synchronous control of the tension wheel is achieved under the action of the synchronization mechanism.

[0011] Furthermore, to ensure that the transmission belt does not move out of place: the driving wheel, the driven wheel and the tensioning wheel are all provided with belt grooves, and the belt grooves are used to accommodate the transmission belt; the side walls of the belt grooves are provided with guide surfaces, and the guide surfaces are inclined from the bottom of the groove toward the outside of the groove, and the guide surfaces are used to ensure that the transmission belt can operate normally after the driven wheel and the tensioning wheel are adjusted.

[0012] Preferably, the part (waste material) cut off by the cast film machine is handled as follows: the trimming assembly also includes guide members arranged on both sides of the trimming roller in the length direction, the guide members are located at the discharge end of the trimming roller, the guide members are arranged to be higher in the middle and lower at both ends, and the guide members act on the part cut off by the cast film machine; the guide members are rotatably arranged on the swinging member, and the position of the guide members on the swinging member is adjusted according to the amount of the cut off part.

[0013] Preferably, the remaining structure of the cast film machine is as follows: the cast film machine also includes a feeding assembly, a film head assembly, a calendering assembly and a tension assembly; the feeding assembly is a spiral feeding mechanism, and the feeding assembly is used to provide molten plastic; the film head assembly is used to extrude the molten plastic into a film; the calendering assembly includes a first calendering roller and a second calendering roller, and the calendering assembly is used to apply pressure and cooling to the film extruded by the film head assembly; the tension assembly is used to control the constant tension of the film during the entire production process.

[0014] The technical effects of the present invention are mainly reflected in the following aspects:

[0015] The present invention connects the trimming roller and the take-up roller by introducing a synchronization component, ensuring that the line speeds of the two rollers are consistent. This design solves the problem of mismatch between the trimming rate and the take-up rate in traditional cast film machines, and avoids problems such as film edge tearing, waste accumulation, or machine jamming caused by rate differences.

[0016] The driven wheel adopts an adjustable diameter design, which can automatically adjust the diameter according to the change of the thickness of the material roll on the take-up roller, ensuring that the linear speed of the driven wheel can match the linear speed of the driving wheel (i.e. the trimming roller) during the entire rewinding process, no matter how thick the material roll is. The tensioning wheel also adopts a similar design, which can maintain the appropriate tension of the transmission belt by changing its position or diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present invention;

[0018] Figure 2 for Figure 1 Structural diagram of the center receiving assembly and the trimming assembly;

[0019] Figure 3 for Figure 1 The structural diagram of the synchronization component in the

[0020] Figure 4 for Figure 3 Structural diagram of the driven wheel;

[0021] Figure 5 for Figure 3 Control structure diagram of the middle tensioner;

[0022] Figure 6 for Figure 3 The structural diagram of the middle driving wheel;

[0023] Figure 7 for Figure 1 The structure diagram of the synchronization mechanism of the synchronization component;

[0024] In the figure: 1. material receiving assembly, 11. material receiving roller; 2. trimming assembly, 21. trimming roller; 22. material guide member; 23. swing member; 3. synchronization assembly, 31. driving wheel; 32. driven wheel; 321. first wheel core; 322. first transmission member; 323. first fixed member; 324. first sliding member; 325. first adjusting member; 326. first control member; 327. first installation cavity; 33. transmission belt; 34. tensioning wheel; 341. third sliding member; 342. third fixed member; 351. piston tube; 352. first piston block; 353. second piston; 36. belt groove; 37. guide surface; 4. feeding assembly; 5. membrane head assembly; 6. calendaring assembly; 7. tension assembly. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0026] In this embodiment, it should be understood that the orientations or positional relationships indicated by terms such as "middle", "upper", "lower", "top", "right", "left end", "above", "back", and "middle" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, in this specific embodiment, if the connection or fixing method between components is not specifically described, the connection or fixing method can be through bolt fixing or pin fixing, or pin shaft connection and the like commonly used in the prior art, and therefore, it will not be described in detail in this embodiment.

[0028] Embodiment 1

[0029] See also Figure 1In a conventional cast film machine, the rate control of the trimming device and the winding system is usually performed independently, which may result in a rate difference between the two, thereby affecting the quality of the film. This embodiment discloses a cast film machine with the same trimming rate and winding rate, the cast film machine comprising a receiving assembly 1 having a receiving roller 11 and a trimming assembly 2 having a trimming roller 21; a synchronization assembly 3 is arranged between the receiving assembly 1 and the trimming assembly 2, and the trimming roller 21 is connected to the receiving roller 11 through the synchronization assembly 3, ensuring that the linear speeds of the two remain consistent. The synchronization component 3 includes a driving wheel 31, which is connected to the trimming roller 21, and the linear speed of the transmission surface of the driving wheel 31 is consistent with the trimming rate of the trimming component 2; a driven wheel 32, which is connected to the receiving roller 11, and is a variable diameter wheel. The diameter of the driven wheel 32 can increase with the increase of the thickness of the roll on the receiving roller 11, so that the linear speed of the transmission surface of the driven wheel 32 is consistent with the winding rate of the receiving component 1; because the driven wheel 32 is a variable diameter wheel, as the winding process proceeds, the roll gradually increases, and the diameter of the driven wheel 32 will also increase accordingly. This feature allows the consistency of the trimming rate and the winding rate to be maintained even when the roll is thin at the beginning of winding and when the roll is completely full at the end, avoiding various problems caused by rate mismatch, such as edge tearing, waste accumulation or machine jamming. The transmission belt 33 connects the driving wheel 31 and the driven wheel 32, so that the linear speed of the driving wheel 31 is consistent with the linear speed of the driven wheel 32, so as to achieve the consistency of the trimming rate of the trimming component 2 and the winding rate of the receiving component 1. The receiving roller 11 is provided with a sensor to feedback the thickness of the roll on the receiving roller 11. Combined with the data of the thickness sensor, the dynamic adjustment of the tension wheel 34 becomes more intelligent and accurate. Whether by changing the diameter of the tension wheel 34 or moving its position, it can be fine-tuned according to the actual roll thickness, thereby achieving fine control of the tension of the transmission belt 33. This not only improves the response speed of the system, but also enhances the stability of the production line and the quality of the film.

[0030] Specifically, during the operation of the cast film machine, the molten plastic is extruded and rapidly cooled to form a film. When the film passes through the trimming assembly 2, the trimming roller 21 trims the edge of the film at a certain rate. At the same time, the driving wheel 31 in the synchronization assembly 3 drives the transmission belt 33 to rotate, and the transmission belt 33 drives the driven wheel 32 to rotate. Since the driven wheel 32 is a variable diameter wheel, its diameter will change according to the thickness of the roll on the receiving roller 11, so that the linear speed of the transmission surface on the driven wheel 32 is always the same as the linear speed of the driving wheel 31. Therefore, no matter how thick the roll on the receiving roller 11 is, the winding rate will be consistent with the trimming rate, ensuring the accuracy and quality of the film edge trimming.

[0031] See also Figure 3 The synchronization component 3 also includes a tensioning wheel 34, which is used to control the tension of the transmission belt 33; when the diameter of the driven wheel 32 changes with the thickness of the material roll on the receiving roller 11, the tension of the transmission belt 33 is ensured to remain unchanged by changing the diameter of the tensioning wheel 34 or changing the position of the tensioning wheel 34; the problem of the change in tightness of the transmission belt 33 caused by the change in diameter of the driven wheel 32 is solved, and the existence of the tensioning wheel 34 can prevent the transmission belt 33 from slipping due to being too loose or being damaged due to being too tight, thereby ensuring the consistency of the trimming rate and the winding rate.

[0032] Specifically, in order to cope with the situation that the diameter of the driven wheel 32 changes with the thickness of the material roll on the receiving roller 11, the present embodiment provides two ways to keep the tension of the transmission belt 33 unchanged: changing the diameter of the tension wheel 34: when the driven wheel 32 becomes larger, the diameter of the tension wheel 34 is adjusted to decrease through mechanical or hydraulic devices, and vice versa. This design can automatically adapt to the changes of the driven wheel 32 without moving the position of the tension wheel 34, and maintain the proper tension of the transmission belt 33. Changing the position of the tension wheel 34: it can move forward and backward according to the change in the diameter of the driven wheel 32. The diameter of the driven wheel 32 is monitored by a sensor, and the control system drives the motor or cylinder to adjust the position of the tension wheel 34, so that the transmission belt 33 always maintains the best tension state.

[0033] See also Figure 3 , Figure 4The driven wheel 32 is composed of a first wheel core 321 and a first transmission member 322 arranged in an arc shape on the outer side of the first wheel core 321. The first wheel core 321 is the core part of the driven wheel 32 and provides support and guidance functions. The first transmission member 322 is designed in an arc shape and can be freely extended and retracted under the drive of the first sliding member 324 to adapt to different diameter requirements. This design ensures good contact between the transmission belt 33 and the driven wheel 32, and improves the transmission efficiency. The first wheel core 321 is provided with first fixing members 323 at equal intervals on the periphery of the first wheel core 321. The first fixing members 323 are provided with first sliding members 324 connected to the first transmission member 322. The first sliding members 324 are provided with first adjusting members 325 rotatably. All the first adjusting members 325 are rotatably connected to the first control member 326. The first wheel core 321 is provided with a first installation cavity 327. The first control member 326 is slidably arranged in the first installation cavity 327. The diameter of the driven wheel 32 is controlled by adjusting the position of the control member on the first wheel core 321. The first control member 326 is slidably arranged in the first installation cavity 327 inside the first wheel core 321. It is driven by hydraulic, electric or other means and can automatically adjust its position according to the information fed back by the thickness sensor. This design ensures the precise control of the diameter of the driven wheel 32 and maintains stable transmission performance even when the thickness of the roll varies greatly.

[0034] When the tension of the transmission belt 33 is controlled by changing the diameter of the tensioning wheel 34, the structure of the tensioning wheel 34 is the same as the structure of the driven wheel 32; specifically, the tensioning wheel 34 is composed of a second wheel core and a second transmission member arranged in an arc shape on the outer side of the second wheel core, and the outer periphery of the second wheel core is circumferentially equidistantly provided with second fixing members, and the second fixing members are each provided with a second sliding member connected to the second transmission member, and the second sliding member is rotatably provided with a second adjusting member, and all the second adjusting members are rotatably connected to the second control member; a second installation cavity is opened on the second wheel core, and the second control member is slidably arranged in the second installation cavity; the diameter of the tensioning wheel 34 is controlled by adjusting the positions of the two control members on the second wheel core; combined with the adjustable design of the driven wheel 32 and the tensioning wheel 34, the system can more flexibly cope with changes in the thickness of the material roll on the receiving roller 11. When the thickness sensor detects that the thickness of the roll increases, the control system will not only adjust the diameter of the driven wheel 32 to keep the line speed consistent, but also adjust the diameter of the tension wheel 34 accordingly to ensure that the tension of the transmission belt 33 is always in the best state. This dual adjustment mechanism greatly improves the stability and reliability of the system and avoids problems caused by changes in the tension of the transmission belt 33, such as slippage or damage.

[0035] See also Figure 7The synchronization component 3 also includes a synchronization mechanism arranged between the driven wheel 32 and the tensioning wheel 34, and the synchronization mechanism is composed of a piston tube 351 and piston blocks arranged at both ends of the piston tube 351; the piston blocks are respectively a first piston block 352 and a second piston block 353, the first piston block 352 is connected to the first control member 326, and the second piston block 353 is connected to the tensioning wheel 34; when controlling the diameter of the driven wheel 32, the synchronization control of the tensioning wheel 34 is achieved under the action of the synchronization mechanism.

[0036] Specifically, the adjustment of the driven wheel 32 and the tension wheel 34 is more closely linked through the synchronization component 3. When the thickness sensor detects that the thickness of the material roll on the receiving roller 11 changes, the control system will adjust the diameter of the driven wheel 32 as needed. Since the first piston block 352 is connected to the first control member 326, when the diameter of the driven wheel 32 is adjusted, the hydraulic pressure or air pressure in the piston tube 351 will change, pushing the second piston 353 to move, thereby synchronously adjusting the diameter of the tension wheel 34. This integrated adjustment mechanism not only improves the response speed of the system, but also enhances the stability and reliability of the production line. As the core part of the synchronization component 3, the piston tube 351 provides a channel for hydraulic or air pressure transmission. The first piston block 352 and the second piston block 353 are respectively connected to the first control member 326 of the driven wheel 32 and the tension wheel 34, forming a linkage system. When the first control member 326 moves, the first piston block 352 moves accordingly, causing the hydraulic pressure or air pressure in the piston tube 351 to change, thereby pushing the second piston 353 to move, and realizing synchronous adjustment of the tension wheel 34. This design ensures the coordination between the driven wheel 32 and the tension wheel 34, and can maintain stable transmission performance even when the thickness of the material roll varies greatly.

[0037] See also Figure 6 The driving wheel 31, the driven wheel 32 and the tension wheel 34 are all provided with a belt groove 36, and the belt groove 36 is used to place the transmission belt 33; the side wall of the belt groove 36 is provided with a guide surface 37, and the guide surface 37 is inclined from the bottom of the groove to the outside of the groove, and the guide surface 37 is used for the normal operation of the transmission belt 33 after the driven wheel 32 and the tension wheel 34 are adjusted; it ensures that when the diameter of the driven wheel 32 and the tension wheel 34 is adjusted, the transmission belt 33 can smoothly enter and remain in the belt groove 36, avoiding the problem of the transmission belt 33 deviating or jumping out of the belt groove 36 during the adjustment process. The existence of the guide surface 37 not only improves the stability of the transmission belt 33, but also prolongs its service life.

[0038] Specifically, the combined design of the belt groove 36 and the guide surface 37 significantly enhances the transmission stability of the system. Even when the diameters of the driven wheel 32 and the tension wheel 34 change dynamically, the transmission belt 33 can always remain on the correct path, reducing the risk of slipping, wear and breakage. At the same time, due to the existence of the guide surface 37, the adjustment process of the driven wheel 32 and the tension wheel 34 becomes simpler and more reliable. The operator does not need to worry about the transmission belt 33 deviating from the track due to adjustment, thereby reducing the adjustment time and difficulty. This is particularly important for production lines that require frequent adjustments, which can significantly improve production continuity and product quality.

[0039] See also Figure 2 , the trimming assembly 2 also includes a material guide 22 arranged on both sides of the trimming roller in the length direction, the material guide 22 is located at the discharge end of the trimming roller, the material guide 22 is set high in the middle and low at both ends, and the material guide 22 acts on the part cut off by the cast film machine; the function of the material guide 22 is to guide the trimmed waste material to discharge it smoothly to avoid accumulation or jamming. This design not only improves the efficiency of waste treatment, but also reduces the impact on subsequent production links. The material guide 22 is rotatably set on the swing member 23, and the position of the material guide 22 on the swing member 23 is adjusted according to the amount of the cut part. When the trimming amount changes, the swing member 23 will adjust the angle and height of the material guide 22 according to actual needs to ensure that the waste can be discharged smoothly. This dynamic adjustment mechanism enables the material guide 22 to adapt to different production conditions and ensures the flexibility and stability of the system.

[0040] See also Figure 1 , the cast film machine also includes a feeding component 4, a film head component 5, a calendering component 6 and a tension component 7; the feeding component 4 is a spiral feeding mechanism, and the feeding component 4 is used to provide molten plastic; the spiral feeding mechanism can evenly feed the plastic raw material into the heating zone to ensure that the plastic is fully melted and provide a stable supply of raw materials for subsequent processes. The film head component 5 is used to extrude the molten plastic into a film. The calendering component 6 includes a first calendering roller and a second calendering roller, and the calendering component 6 is used to apply pressure and cooling to the film extruded by the film head component 5; the surface temperature and pressure of the calendering roller can be accurately adjusted by the control system to ensure that the film maintains the ideal thickness and physical properties during the cooling process. The tension component 7 is used to control the constant tension of the film throughout the production process; the tension component 7 monitors the tension of the film in real time through a sensor, and automatically adjusts it according to needs to ensure that the film will not be stretched, torn, etc. due to tension changes between various processes. This design significantly improves the stability of production and product quality.

[0041] Embodiment 2

[0042] See also Figure 5This embodiment discloses a cast film machine with the same trimming rate and winding rate. Compared with the cast film machine of the first embodiment, this embodiment discloses a structural setting for controlling the tension of the transmission belt 33 by changing the position of the tensioning wheel 34, which is as follows:

[0043] When the tension of the transmission belt 33 is controlled by changing the position of the tension wheel 34, the tension wheel 34 is arranged on the third sliding member 341, and the third sliding member 341 is slidably arranged on the third fixing member 342; the position of the tension wheel 34 is controlled by adjusting the position of the third sliding member 341 on the third fixing member 342. Specifically, the design of the third sliding member 341 allows the tension wheel 34 to move along a straight line or an arc as required to adjust its position relative to the driven wheel 32 and the driving wheel 31; the third fixing member 342 can be a linear guide rail, an arc guide rail or other forms of guide devices, depending on the actual needs of the production line.

[0044] In addition, as common knowledge in the industry, the above-mentioned receiving assembly 1, trimming assembly 2, feeding assembly 4, film head assembly 5, calendering assembly 6 and tension assembly 7 are common knowledge, so their principles and structures will not be described in detail.

[0045] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A cast film machine with the same trimming rate and winding rate, the cast film machine comprising a receiving assembly with a receiving roller and a trimming assembly with a trimming roller; characterized in that: A synchronization component is provided between the material receiving component and the trimming component, and the synchronization component comprises: A driving wheel, the driving wheel is connected to the trimming roller, and the linear speed of the transmission surface on the driving wheel is consistent with the trimming rate of the trimming assembly; A driven wheel, the driven wheel is connected to the receiving roller, the driven wheel is a variable diameter wheel, and the diameter of the driven wheel can increase as the thickness of the material roll on the receiving roller increases, so that the linear speed of the transmission surface on the driven wheel is consistent with the winding speed of the receiving assembly; A transmission belt connects the driving wheel and the driven wheel, so that the linear speed of the driving wheel is consistent with the linear speed of the driven wheel, thereby achieving consistency in the trimming rate of the trimming component and the winding rate of the material receiving component.

2. The cast film machine according to claim 1, characterized in that: The synchronization assembly further comprises a tensioning wheel, and the tensioning wheel is used to control the tension of the transmission belt; When the diameter of the driven wheel changes with the thickness of the material roll on the receiving roller, the tension of the transmission belt is ensured to remain unchanged by changing the diameter of the tension wheel or changing the position of the tension wheel.

3. The cast film machine according to claim 2, characterized in that: The driven wheel is composed of a first wheel core and a first transmission member arranged in an arc shape on the outer side of the first wheel core, first fixing members are arranged equidistantly on the outer periphery of the first wheel core, first sliding members connected to the first transmission member are arranged on the first fixing members, first adjusting members are rotatably arranged on the first sliding members, and all the first adjusting members are rotatably connected to the first control member; The first wheel core is provided with a first installation cavity, and the first control member is slidably arranged in the first installation cavity; the diameter of the driven wheel is controlled by adjusting the position of the control member on the first wheel core.

4. The cast film machine according to claim 3, characterized in that: When the tension of the transmission belt is controlled by changing the diameter of the tensioning wheel; The tension wheel is composed of a second wheel core and a second transmission member arranged in an arc shape on the outer side of the second wheel core, second fixing members are arranged equidistantly on the outer periphery of the second wheel core, second sliding members connected to the second transmission member are arranged on the second fixing members, second adjusting members are rotatably arranged on the second sliding members, and all the second adjusting members are rotatably connected to the second control member; The second wheel core is provided with a second installation cavity, and the second control member is slidably arranged in the second installation cavity; the diameter of the tensioning wheel is controlled by adjusting the positions of the two control members on the second wheel core.

5. The cast film machine according to claim 3, characterized in that: When the tension of the transmission belt is controlled by changing the position of the tensioning wheel; The tensioning wheel is arranged on a third sliding member, and the third sliding member is slidably arranged on a third fixing member; the position of the tensioning wheel is controlled by adjusting the position of the third sliding member on the third fixing member.

6. The cast film machine according to claim 4 or 5, characterized in that: The synchronization assembly further comprises a synchronization mechanism disposed between the driven wheel and the tension wheel, the synchronization mechanism comprising a piston tube and piston blocks disposed at both ends of the piston tube; the piston blocks are respectively a first piston block and a second piston block, the first piston block is connected to the first control member, and the second piston block is connected to the tension wheel; When the diameter of the driven wheel is controlled, synchronous control of the tension wheel is achieved under the action of the synchronization mechanism.

7. The cast film machine according to claim 2, characterized in that: The driving wheel, the driven wheel and the tensioning wheel are all provided with belt grooves for accommodating the transmission belt; the side walls of the belt grooves are provided with guide surfaces, which are inclined from the bottom of the grooves toward the outside of the grooves, and the guide surfaces are used for the transmission belt to operate normally after the driven wheel and the tensioning wheel are adjusted.

8. The cast film machine according to claim 1, characterized in that: The trimming assembly also includes guides arranged on both sides of the trimming roller in the length direction, the guides are located at the discharge end of the trimming roller, the guides are arranged to be high in the middle and low at both ends, and the guides act on the portion cut off by the cast film machine; The material guide member is rotatably arranged on the swing member, and the position of the material guide member on the swing member is adjusted according to the amount of the cut-off portion.

9. The cast film machine according to claim 1, characterized in that: The cast film machine also includes a feeding assembly, a film head assembly, a calendering assembly and a tension assembly; The feeding assembly is a spiral feeding mechanism, and the feeding assembly is used to provide molten plastic; the membrane head assembly is used to extrude the molten plastic into a film; the calendering assembly includes a first calendering roller and a second calendering roller, and the calendering assembly is used to apply pressure and cooling to the film extruded by the membrane head assembly; the tension assembly is used to control the constant tension of the film during the entire production process.

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