Film casting equipment

Abstract

The invention discloses thin film casting equipment which comprises a casting assembly, a working table, two supporting plates, a first motor, a mounting disc, a plurality of winding assemblies, a roll measuring assembly and a cutting assembly, the working table is arranged on one side of the casting assembly, a button is arranged on the working table, and the two supporting plates are arranged on the two sides of the working table correspondingly; the first motor is arranged on one supporting plate, and an output shaft of the first motor is connected with the mounting disc; the two ends of the mounting disc are rotationally connected with the corresponding supporting plates correspondingly. The multiple winding assemblies can rotate along with the mounting disc and conduct adhering and winding on the thin film. The roll measuring assembly is used for carrying out rolling monitoring on each rolling assembly and carrying out film cutting control on the cutting assembly; the cutting assembly is used for cutting the film. Therefore, the rolling thickness condition can be automatically detected, continuous rolling can be achieved, and therefore the rolling efficiency of film casting is improved.

Description

Technical Field

[0001] The present application relates to the technical field of film production equipment, and in particular to a film casting equipment. Background Art

[0002] Film casting equipment, also known as cast film production line, is an important equipment used to manufacture plastic film. It melts and plasticizes plastic particles, pumps the plastic solution out of the die, cools it on a cooling rack, and finally forms a continuous film roll. This process includes feeding, melting, die outflow, cooling and winding, and each system works together to ensure the high quality and production efficiency of the film.

[0003] In the rewinding process of the original film casting equipment, the relevant personnel first fix the rewinding drum on the rewinding shaft, and then fix the film cast by the casting assembly on the rewinding drum. After starting the motor, the motor drives the rewinding shaft and the rewinding drum to rotate, thereby rewinding the film. When the operator detects that the rewinding reaches a certain thickness, the motor is stopped, and the rewinding drum that is full of film is cut off and replaced with a new rewinding drum. One end of the film is fixed on the new rewinding drum again, and the above operation is repeated. In this process, the operator needs to check the rewinding thickness many times, and the film cannot be rewound continuously, which affects the rewinding efficiency of the film casting. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the purpose of the present application is to provide a film casting device that can automatically detect the thickness of the winding and can continuously wind up, thereby improving the winding efficiency of the film casting.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a film casting device, including a casting component, a workbench, two support plates, a first motor, a mounting disk, a plurality of winding components, a roll measuring component and a cutting component, wherein the workbench is arranged on one side of the casting component, and a button is arranged on the workbench, and the button is used to control the first motor; the two support plates are respectively arranged on both sides of the workbench; the first motor is arranged on one support plate, and the output shaft of the first motor is connected to the mounting disk; the two end portions of the mounting disk are respectively rotatably connected to the corresponding support plates; a plurality of winding components are respectively arranged at intervals on the outer circle side of the mounting disk, and the plurality of winding components can rotate with the mounting disk and adhere and receive the film; the roll measuring component is arranged on the workbench, and the plurality of winding components are respectively connected to the roll measuring component in a transmission manner, and the roll measuring component is used to monitor the winding of each winding component, and one end of the roll measuring component is slidably connected to the workbench, and the other end of the roll measuring component is slidably abutted against the cutting component, and the cutting component performs film cutting control; the cutting component is arranged on the workbench, the cutting component can slide, and is located on one side of the roll measuring component, the cutting component slides to press the button, and the cutting component is used to cut the film.

[0007] According to a film casting device of an embodiment of the present application, the film casting device can automatically detect the thickness of the winding and can continuously wind up, thereby improving the winding efficiency of the film casting.

[0008] In addition, the film casting device proposed in the present application may also have the following additional technical features:

[0009] In one embodiment of the present application, the winding assembly includes a second motor, a mounting shaft and a winding drum, wherein the second motor is arranged on the mounting disk, a driving gear is arranged on the output shaft of the second motor, and the driving gear is meshed and transmission-connected with one end of the measuring roll assembly; the mounting shaft is rotatably arranged on the mounting disk, and the output shaft of the second motor is connected to the mounting shaft; the winding drum is arranged on the mounting shaft, and a rubber strip is arranged on the winding drum.

[0010] In one embodiment of the present application, the roll measuring assembly includes a transmission gear group, two mounting plates, a reciprocating screw, a reciprocating slider and an elastic abutment, wherein the transmission gear group is arranged on a workbench, and one end of the transmission gear group is meshed and transmission-connected with the corresponding driving gear; the two mounting plates are respectively arranged on both sides of the workbench; the two end portions of the reciprocating screw are respectively rotatably arranged on the corresponding mounting plates, and one end of the reciprocating screw passes through the mounting plates and is transmission-connected with the other end of the transmission gear group; the reciprocating slider is sleeved on the reciprocating screw, and the bottom of the reciprocating slider is slidingly connected to the workbench; the elastic abutment is arranged on one side of the reciprocating slider and abuts against the cutting assembly.

[0011] In one embodiment of the present application, the elastic abutment member includes a fixed plate, an abutment plate and a spiral spring, wherein the fixed plate is arranged on the reciprocating slider; the abutment plate is rotationally connected to the reciprocating slider, and the abutment plate abuts against the cutting assembly; the spiral spring is arranged at the rotation connection between the fixed plate and the abutment plate, and one end of the spiral spring is connected to the fixed plate, and the other end of the spiral spring is connected to the abutment plate.

[0012] In one embodiment of the present application, the cutting assembly includes two connecting plates, a limiting tube and a moving block, wherein the two connecting plates are arranged on both sides of the workbench; the two end portions of the limiting tube are respectively arranged on the corresponding connecting plates, a compression spring and a limiting slider are arranged in the limiting tube, one end of the compression spring is connected to the limiting tube, the other end of the compression spring is connected to the limiting slider, and the top of the limiting slider is slidably connected to a sliding hole opened on the limiting tube; the moving block is slidably arranged on the limiting tube and abuts against the limiting slider, and a pressing rod is arranged on the moving block, and the pressing rod is slidably and press-connected with the button; a cutting tool is arranged on the moving block; a one-way rotating plate is arranged on the moving block, and the abutting plate slidably abuts against the one-way rotating plate.

[0013] In one embodiment of the present application, the one-way rotating plate includes a fixed seat and a rotating plate, wherein the fixed seat is arranged on the moving block; one end of the rotating plate is hinged to one end of the fixed seat, and the other end of the rotating plate is abutted to the other end of the fixed seat, and the abutting plate is abutted to the rotating plate in one direction.

[0014] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0016] Figure 1 It is a structural schematic diagram of a film casting device according to an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the installation structure of the driving gear and the transmission gear set according to an embodiment of the present application;

[0018] Figure 3 This is a schematic structural diagram of a winding assembly according to an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of the installation structure of the roll measuring assembly and the cutting assembly according to one embodiment of the present application;

[0020] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0021] Figure 6 The figure is a schematic diagram of the installation structure of a compression spring and a limiting slider according to an embodiment of the present application.

[0022] As shown in the figure: 1. cast film assembly; 2. workbench; 20. button; 3. support plate; 4. first motor; 5. mounting plate; 6. winding assembly; 60. second motor; 600. driving gear; 61. mounting shaft; 62. winding drum; 620. rubber strip; 7. measuring roll assembly; 70. transmission gear set; 71. mounting plate; 72. reciprocating screw rod; 73. reciprocating slider; 74. elastic abutment; 740. fixing plate; 741. abutment plate; 742. scroll spring; 8. cutting assembly; 80. connecting plate; 81. limiting tube; 810. compression spring; 811. limiting slider; 82. moving block; 820. pressing rod; 821. cutting tool; 822. one-way rotating plate; 8220. fixing seat; 8221. rotating plate. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] The film casting device according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0025] like Figure 1-Figure 6 As shown, the film casting equipment of the embodiment of the present application may include a casting assembly 1, a workbench 2, two support plates 3, a first motor 4, a mounting plate 5, a plurality of winding assemblies 6, a measuring roll assembly 7 and a cutting assembly 8.

[0026] The workbench 2 is disposed on one side of the casting assembly 1 , and a button 20 is disposed on the workbench 2 , and the button 20 is used to control the first motor 4 .

[0027] It should be noted that the casting assembly 1 described in this embodiment is a common component in film casting equipment. The casting assembly 1 includes a feeding system, a melting system, an extrusion system, a cooling system and a stretching system. The improvement of the present application lies in the winding of the film, and the above-mentioned systems and the specific connection relationships therebetween are all prior arts and will not be described here.

[0028] The two support plates 3 are respectively arranged on both sides of the workbench 2, the first motor 4 is arranged on one support plate 3, and the output shaft of the first motor 4 is connected to the mounting plate 5, and the two end portions of the mounting plate 5 are respectively rotatably connected to the corresponding support plates 3.

[0029] It should be noted that the first motor 4 described in this embodiment is connected to the button 20 through an electrical wire, so that when the button 20 is pressed, the controller (not shown in the figure) controls the rotation of the first motor 4 at a fixed angle, and drives the mounting disk 5 to rotate at a fixed angle, thereby facilitating the replacement and winding of the winding assembly 6.

[0030] The plurality of winding assemblies 6 are respectively arranged at intervals on the outer circumferential side of the mounting disk 5, and the plurality of winding assemblies 6 can rotate along with the mounting disk 5 and adhere and roll up the film.

[0031] It can be understood that the first motor 4 drives the mounting disk 5 to rotate at a fixed angle, so that one winding component 6 rotates backward after winding is completed, the other winding component 6 abuts against the film and adheres to the film, the cutting component 8 cuts the film, and the other winding component 6 rotates to wind up the film, thereby realizing continuous winding of the film.

[0032] The roll measuring assembly 7 is arranged on the workbench 2, and multiple roll-reeling assemblies 6 are respectively connected to the roll measuring assembly 7 in a transmission manner. The roll measuring assembly 7 is used to monitor the reeling of each reeling assembly 6, and one end of the roll measuring assembly 7 is slidably connected to the workbench 2, and the other end of the roll measuring assembly 7 is slidably abutted against the cutting assembly 8, and the cutting assembly 8 is controlled to cut the film. The cutting assembly 8 is arranged on the workbench 2, the cutting assembly 8 is slidable, and is located on one side of the roll measuring assembly 7. The cutting assembly 8 slides and presses the button 20, and the cutting assembly 8 is used to cut the film.

[0033] It can be understood that each winding component 6 will transmit the measuring component 7 during the winding process, and the measuring component 7 moves and drives the cutting component 8 to move. When the winding component 6 is wound to a certain quantity, the measuring component 7 controls the cutting component 8 to make the cutting component 8 slide and cut the film, thereby realizing automatic control of the winding thickness of the film, without the need for relevant operators to measure the winding thickness multiple times.

[0034] Specifically, in the actual operation process, the relevant operator pours the plastic particles into the casting component 1 and starts the device. The casting component 1 melts, extrude, cools and stretches the plastic particles. The relevant operator fixes one end of the film processed by the casting component 1 on one of the winding components 6. The controller controls the winding component 6 to rotate to wind the film. During the rotation of the winding component 6, it transmits to the measuring roll component 7. When the measuring roll component 7 moves, it drives the cutting component 8 to move. After the measuring roll component 7 moves to the specified position, the controller controls the first motor 4 to rotate. The first motor 4 The mounting plate 5 is driven to rotate at a specified angle, so that one of the winding components 6 rotates counterclockwise backward, and the other winding component 6 rotates counterclockwise backward and abuts and bonds with the film. At this time, the measuring component 7 no longer drives the cutting component 8 to move, and the cutting component 8 elastically slides back to the initial position. During the sliding process, the film between the two winding components 6 is cut, so that the other winding component 6 continues to wind the film. The relevant operator removes the wound film and replaces it with a new winding component 6, and this reciprocating process is used to realize the continuous winding of the film and the automatic measurement of the winding thickness.

[0035] In one embodiment of the present application, Figure 3 and Figure 5 As shown, the winding assembly 6 may include a second motor 60 , a mounting shaft 61 and a winding drum 62 .

[0036] Among them, the second motor 60 is arranged on the mounting disk 5, and a driving gear 600 is arranged on the output shaft of the second motor 60. The driving gear 600 is meshed and transmission connected with one end of the measuring roll assembly 7. The mounting shaft 61 is rotatably arranged on the mounting disk 5, and the output shaft of the second motor 60 is connected to the mounting shaft 61. The winding drum 62 is arranged on the mounting shaft 61, and a rubber strip 620 is arranged on the winding drum 62.

[0037] It should be noted that the winding drum 62 and the mounting shaft 61 described in this embodiment are detachably connected, thereby facilitating the replacement of the winding drum 62. In addition, by providing the rubber strip 620 on the winding drum 62, the film can be adhered when the winding drum 62 abuts against the film, thereby facilitating the winding of the film by the winding drum 62.

[0038] In one embodiment of the present application, Figure 2-Figure 5 As shown, the roll measuring assembly 7 may include a transmission gear set 70 , two mounting plates 71 , a reciprocating screw rod 72 , a reciprocating slider 73 and an elastic abutment member 74 .

[0039] Among them, the transmission gear group 70 is arranged on the workbench 2, one end of the transmission gear group 70 is meshed and transmission connected with the corresponding driving gear 600, two mounting plates 71 are respectively arranged on both sides of the workbench 2, and the two end portions of the reciprocating screw rod 72 are respectively rotatably arranged on the corresponding mounting plates 71, and one end of the reciprocating screw rod 72 passes through the mounting plate 71 and is transmission connected with the other end of the transmission gear group 70, the reciprocating slider 73 is sleeved on the reciprocating screw rod 72, and the bottom of the reciprocating slider 73 is slidingly connected with the workbench 2, and the elastic abutment member 74 is arranged on one side of the reciprocating slider 73 and abuts against the cutting assembly 8.

[0040] It should be noted that the transmission gear set 70 described in this embodiment is provided with a plurality of gears of different sizes and a separate transmission belt, and the connection of the various components of the transmission gear set 70 is set according to the working conditions, and is a common gear connection method and a transmission belt socket connection method, which are not described in detail here. In addition, the transmission gear set 70 is used to control the rotation speed of the reciprocating screw 72, and control the sliding speed of the reciprocating slider 73 on the reciprocating screw 72, so that when the reciprocating slider 73 slides to the end of the reciprocating screw 72, the corresponding winding drum 62 has wound up the winding amount within the specified range, thereby realizing automatic measurement of the film winding thickness.

[0041] In one embodiment of the present application, Figure 5 As shown, the elastic abutment member 74 may include a fixing plate 740 , an abutment plate 741 and a spiral spring 742 .

[0042] Among them, the fixed plate 740 is set on the reciprocating slider 73, the abutment plate 741 is rotationally connected to the reciprocating slider 73, and the abutment plate 741 abuts against the cutting assembly 8, the spiral spring 742 is set at the rotation connection between the fixed plate 740 and the abutment plate 741, and one end of the spiral spring 742 is connected to the fixed plate 740, and the other end of the spiral spring 742 is connected to the abutment plate 741.

[0043] It should be noted that the spiral spring 742 described in this embodiment will limit the range of its elastic force, so that when the reciprocating slider 73 slides to the end of the reciprocating screw 72, the abutment plate 741 continues to abut against the cutting assembly 8 and undergoes elastic deformation, causing the abutment plate 741 to bend through one side of the cutting assembly 8. The cutting assembly 8, which is no longer restricted by the abutment, elastically slides back to its initial position and cuts the film during the sliding process. In addition, after the reciprocating screw 72 returns to its initial position, the abutment plate 741 can repeat the above operation and pass through the other side of the cutting assembly 8, so that it continues to drive the cutting assembly 8 to move when it moves next time.

[0044] In one embodiment of the present application, Figure 4 and Figure 5 As shown, the cutting assembly 8 may include two connecting plates 80 , a limiting tube 81 and a moving block 82 .

[0045] Among them, two connecting plates 80 are arranged on both sides of the workbench 2, and the two end portions of the limiting tube 81 are respectively arranged on the corresponding connecting plates 80, and a compression spring 810 and a limiting slider 811 are arranged in the limiting tube 81, one end of the compression spring 810 is connected to the limiting tube 81, and the other end of the compression spring 810 is connected to the limiting slider 811, and the top of the limiting slider 811 is slidably connected to the sliding hole opened on the limiting tube 81, and the moving block 82 is slidably arranged on the limiting tube 81 and abuts against the limiting slider 811, and a pressing rod 820 is arranged on the moving block 82, and the pressing rod 820 is slidably and pressedly connected with the button 20, a cutting tool 821 is arranged on the moving block 82, and a one-way rotating plate 822 is arranged on the moving block 82, and the abutting plate 741 slidably abuts against the one-way rotating plate 822.

[0046] It should be noted that the compression spring 810 described in this embodiment is smaller than the elastic resistance of the spiral spring 742 , thereby ensuring that the abutment plate 741 drives the one-way rotating plate 822 and the moving block 82 .

[0047] In one embodiment of the present application, Figure 5 and Figure 6 As shown, the one-way rotating plate 822 may include a fixing seat 8220 and a rotating plate 8221 .

[0048] The fixed seat 8220 is arranged on the moving block 82 , one end of the rotating plate 8221 is hinged to one end of the fixed seat 8220 , the other end of the rotating plate 8221 abuts against the other end of the fixed seat 8220 , and the abutting plate 741 abuts against the rotating plate 8221 in one direction.

[0049] It can be understood that, by providing the rotating plate 8221 , the deformation times of the spiral spring 742 are reduced, thereby increasing the service life of the spiral spring 742 .

[0050] Specifically, in the actual operation process, the relevant operator pours the plastic particles into the casting component 1 and starts the device. The casting component 1 melts, extrude, cools and tensions the plastic particles. The relevant operator adheres one end of the film processed by the casting component 1 to the winding drum 62 of one of the winding components 6. The controller controls the second motor 60 to rotate, and drives the mounting shaft 61 and the winding drum 62 to rotate to wind the film. The rotation of the second motor 60 drives the driving gear 600 to rotate, and the rotation of the driving gear 600 drives the transmission gear set 70 to rotate. The transmission gear set 70 drives the reciprocating screw 72 to rotate, and the reciprocating screw 72 controls the movement of the reciprocating slider 73 and the elastic abutment 74.

[0051] When the elastic abutment plate 741 moves, the abutment plate 741 in the elastic abutment member 74 drives the one-way rotating plate 822 and the moving block 82 to move. After the reciprocating slider 73 slides to the specified position, the pressing rod 820 on the moving block 82 presses the button 20, and the button 20 transmits a signal to the controller. The controller controls the first motor 4 to rotate, and the first motor 4 drives the mounting disk 5 to rotate at a specified angle, so that one of the winding components 6 of the winding rotates counterclockwise backward, so that the other winding component 6 rotates counterclockwise backward and abuts and adheres to the film. At this time, the second motor 60 no longer rotates to rewind, and the driving gear 600 in the other winding component 6 continues to mesh with one end of the transmission gear set 70 and drives the reciprocating slider 73 to rotate. The multi-thread rod 72 moves a certain distance, so that the abutment plate 741 is continuously in abutment with the one-way rotating plate 822. When the elastic resistance of the spiral spring 742 is exceeded, the abutment plate 741 bends through the one-way rotating plate 822, so that the compression spring 810 restores its elastic deformation, driving the limiting slider 811 and the moving block 82 to quickly return to their initial positions. When the limiting slider 811 slides and returns to its initial position, it drives the cutting tool 821 to cut the film between the two winding drums 62, so that the other winding assembly 6 continues to wind the film. The relevant operator removes the wound film and replaces it with a new winding assembly 6, and repeats this process to achieve continuous winding of the film and automatic measurement of the winding thickness.

[0052] In summary, the film casting equipment of the embodiment of the present application can automatically detect the thickness of the winding and can continuously wind up, thereby improving the winding efficiency of the film casting.

[0053] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A film casting device, characterized in that: It includes a casting assembly, a workbench, two support plates, a first motor, a mounting plate, a plurality of winding assemblies, a roll measuring assembly and a cutting assembly, wherein: The workbench is arranged on one side of the casting assembly, and a button is arranged on the workbench, and the button is used to control the first motor; The two support plates are respectively arranged on both sides of the workbench; The first motor is disposed on one of the support plates, and the output shaft of the first motor is connected to the mounting plate; The two end portions of the mounting plate are rotatably connected to the corresponding support plates respectively; The plurality of winding assemblies are respectively arranged at intervals on the outer circumference of the mounting disk, and the plurality of winding assemblies can rotate with the mounting disk and adhere and roll up the film; The roll measuring assembly is arranged on the workbench, and the plurality of winding assemblies are respectively connected to the roll measuring assembly in a transmission manner. The roll measuring assembly is used to monitor the winding of each winding assembly, and one end of the roll measuring assembly is slidably connected to the workbench, and the other end of the roll measuring assembly is slidably abutted against the cutting assembly, and the cutting assembly is used to control film cutting; The cutting assembly is arranged on the workbench, the cutting assembly is slidable, and is located at one side of the roll measuring assembly. The cutting assembly slides to press the button, and the cutting assembly is used to cut the film.

2. The film casting device according to claim 1, characterized in that: The winding assembly includes a second motor, a mounting shaft and a winding drum, wherein: The second motor is arranged on the mounting plate, and a driving gear is arranged on the output shaft of the second motor, and the driving gear is meshed and transmission-connected with one end of the measuring roll assembly; The installation shaft is rotatably disposed on the installation plate, and the output shaft of the second motor is connected to the installation shaft; The winding drum is arranged on the installation shaft, and a rubber strip is arranged on the winding drum.

3. The film casting device according to claim 2, characterized in that: The roll measuring assembly includes a transmission gear set, two mounting plates, a reciprocating screw rod, a reciprocating slider and an elastic abutment member, wherein: The transmission gear set is arranged on the workbench, and one end of the transmission gear set is meshed and transmission-connected with the corresponding driving gear; The two mounting plates are respectively arranged on both sides of the workbench; The two ends of the reciprocating screw rod are rotatably mounted on the corresponding mounting plates, and one end of the reciprocating screw rod passes through the mounting plate and is transmission-connected to the other end of the transmission gear set; The reciprocating slider is sleeved on the reciprocating screw rod, and the bottom of the reciprocating slider is slidably connected to the workbench; The elastic abutment is arranged on one side of the reciprocating slider and abuts against the cutting assembly.

4. The film casting device according to claim 3, characterized in that: The elastic abutment member includes a fixing plate, an abutment plate and a spiral spring, wherein: The fixed plate is arranged on the reciprocating slider; The abutment plate is rotatably connected to the reciprocating slider, and the abutment plate abuts against the cutting assembly; The spiral spring is arranged at the rotation connection between the fixed plate and the abutment plate, and one end of the spiral spring is connected to the fixed plate, and the other end of the spiral spring is connected to the abutment plate.

5. The film casting device according to claim 4, characterized in that: The cutting assembly includes two connecting plates, a limiting tube and a moving block, wherein: The two connecting plates are arranged on both sides of the workbench; The two end portions of the limit tube are respectively arranged on the corresponding connecting plates, a compression spring and a limit slider are arranged in the limit tube, one end of the compression spring is connected to the limit tube, the other end of the compression spring is connected to the limit slider, and the top of the limit slider is slidably connected to the sliding hole opened on the limit tube; The moving block is slidably arranged on the limiting tube and abuts against the limiting slider, and a pressing rod is arranged on the moving block, and the pressing rod is slidably and pressingly connected with the button; The moving block is provided with a cutting tool; The moving block is provided with a one-way rotating plate, and the abutment plate is in sliding abutment with the one-way rotating plate.

6. The film casting device according to claim 5, characterized in that: The one-way rotating plate includes a fixed seat and a rotating plate, wherein: The fixed seat is arranged on the moving block; One end of the rotating plate is hinged to one end of the fixing seat, the other end of the rotating plate is abutted to the other end of the fixing seat, and the abutting plate is abutted to the rotating plate in one direction.

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