PVB (polyvinyl butyral) film extrusion device

Abstract

The utility model belongs to the technical field of PVB (polyvinyl butyral) film extrusion devices, and particularly relates to a PVB film extrusion device which comprises a film extrusion device body and a feeding box, the feeding box is fixedly connected onto the film extrusion device body, a through groove is formed in the feeding box, and a baffle is slidably connected into the through groove; the limiting assembly is located in the feeding box and used for fixing the baffle; the two first sliding grooves are symmetrically formed in the inner wall of the feeding box, two sliding blocks are slidably connected into the two first sliding grooves correspondingly, a fixing rod is fixedly connected between the two sliding blocks, and a dredging rod is fixedly connected to the bottom face of the fixing rod; the two extrusion grooves are formed in the two sliding blocks respectively, and the problems that when a user pours PVB particles into a feeding port of thin film extrusion equipment, the feeding port of the thin film extrusion equipment is likely to be blocked due to too many entering PVB particles, and the working efficiency is reduced are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of PVB film extrusion devices, in particular to a PVB film extrusion device. Background Art

[0002] PVB film extrusion device is a kind of equipment specially used for producing polyvinyl butyral (PVB) film. It is a kind of plastic extruder, which is mainly used to make continuous film products by heating, melting, extruding and other processes of PVB resin.

[0003] PVB film extrusion equipment usually includes main machine, heating system, cooling system, traction system, control system and other parts. The main machine is the main part of the extruder, responsible for converting plastic raw materials into continuous plastic strips. The heating system is used to increase the temperature of the plastic raw materials to make it easier to extrude. The cooling system quickly cools the extruded plastic strip to maintain its shape and performance. The traction system is responsible for pulling the plastic strip out of the die head and keeping it stable. The control system is responsible for adjusting the parameters of each system to ensure the stability of the production process and the consistency of product quality.

[0004] For example, the Chinese patent with the publication number CN205767360U discloses a film extrusion device, which can solve the problem that the film thickness is affected by insufficient feeding, and at the same time avoid the problem that the film quality is unstable due to heat dissipation, including a bracket, an extrusion mechanism, a feed inlet, a discharge port and a motor driving the extrusion mechanism, characterized in that: one end of the extrusion mechanism is arranged on the bracket, the feed inlet is arranged at one end of the extrusion mechanism adjacent to the bracket, and the discharge port is arranged at the other end, a hopper is arranged above the front end of the discharge port, the upper end of the discharge port is open, and an annular heating device is arranged on the inner wall of the discharge port. The utility model can reduce the frequency of material breaking, ensure the fluidity of the film raw material, and improve the stability of the film quality.

[0005] The above patent has the following problems:

[0006] This patent has some disadvantages when used, such as: the film extrusion device does not have a dredging mechanism. When the user pours PVB particles into the feed port of the film extrusion device, the feed port of the film extrusion device may be blocked due to too many PVB particles entering, thereby reducing the working efficiency. In view of this, we propose a PVB film extrusion device. Utility Model Content

[0007] The purpose of the utility model is to provide a PVB film extrusion device to solve the problems raised in the above background technology.

[0008] In view of this, the utility model provides a PVB film extrusion device, comprising:

[0009] A film extrusion device body and a feed box, wherein the feed box is fixedly connected to the film extrusion device body, a through slot is provided on the feed box, and a baffle is slidably connected in the through slot;

[0010] A limiting assembly, which is located in the feed box and is used to fix the baffle;

[0011] Two first chutes, the two first chutes are symmetrically arranged on the inner wall of the feed box, two sliders are slidably connected in the two first chutes respectively, a fixing rod is fixedly connected between the two sliders, and a dredging rod is fixedly connected to the bottom surface of the fixing rod;

[0012] Two extrusion grooves, the two extrusion grooves are respectively opened on two slide blocks;

[0013] A reciprocating assembly is located in the feed box and is used to drive two sliders to move back and forth.

[0014] Based on the above structure, by setting the first slide groove and slider, it is ensured that the slider can slide in the first slide groove, and by setting the reciprocating component, it is ensured that the user can drive the two sliders to reciprocate through the reciprocating component, and by setting the fixed rod and the dredging rod, it is ensured that when the two sliders move back and forth, the two sliders will drive the dredging rod to move reciprocally up and down through the fixed rod, so that the dredging rod can dredge the blocked feed box, and by setting the through groove and baffle, it is ensured that the baffle can slide in the through groove, and that when the dredging rod moves reciprocally up and down, the PVB particles splashing in the feed box will be blocked by the baffle, and by setting the fixed component, it is ensured that the user can fix the baffle in the through groove through the fixed component and cannot move.

[0015] In the above technical solution, further, the limit assembly includes:

[0016] The second slide groove is arranged on the inner wall of the through groove, a plug rod is slidably connected in the second slide groove, and one end of the plug rod passes through the baffle plate and extends into the baffle plate to be plugged into the baffle plate, and a spring fixed to the inner wall of the second slide groove is fixed on the plug rod.

[0017] In this technical solution, it is ensured that the user can fix the baffle in the through slot and cannot move.

[0018] In the above technical solution, further, the insertion rod is in an "L" shape.

[0019] In this technical solution, it is ensured that the user can drive one end of the insertion rod to move through the other end of the insertion rod.

[0020] In the above technical solution, further, the reciprocating assembly includes:

[0021] Two first rotating grooves, the two first rotating grooves are symmetrically arranged in the feed box and are respectively connected to the two first sliding grooves, a rotating disk is rotatably connected in the first rotating groove, a transmission block is fixedly connected to the rotating disk, and one end of the transmission block extends into the slider and is slidably connected to the slider;

[0022] Two movable grooves, the two movable grooves are symmetrically arranged in the feed box and are respectively connected to the two first rotating grooves, a first sprocket and a second sprocket are rotatably connected in the movable grooves, and one end of the first sprocket extends into the first rotating groove and is fixed to the rotating disk, and a chain is meshed between the first sprocket and the second sprocket;

[0023] A second rotating groove, the second rotating groove is arranged in the feed box and communicated with the two movable grooves, a rotating rod is rotatably connected in the second rotating groove, and two ends of the rotating rod extend into the two movable grooves and are fixed to the two second sprockets respectively;

[0024] a third rotating groove, the third rotating groove being arranged on the inner wall of the second rotating groove and being in communication with the outside, a worm wheel fixed to the rotating rod being rotatably connected in the third rotating groove, and a worm wheel meshing with the worm that rotates with the third rotating groove;

[0025] The motor is fixedly connected to the feed box, and the output shaft of the motor extends into the third rotating groove and is fixed to the worm.

[0026] In this technical solution, it is ensured that when the PVB particles block the feed box, the PVB particles can be pushed into the film extrusion device body by the unblocking rod, and then the user starts the film extrusion device body to allow the film extrusion device body to process the PVB particles.

[0027] In the above technical solution, further, one end of the first sprocket is rotatably connected to the first rotating groove, and both ends of the rotating rod are rotatably connected to the two movable grooves respectively.

[0028] In the technical solution, it is ensured that one end of the first sprocket can rotate normally in the first rotating groove, and it is ensured that the two ends of the rotating rod can rotate normally in the two movable grooves respectively.

[0029] In the above technical solution, further, the output shaft of the motor is rotationally connected to the third rotating groove.

[0030] In this technical solution, it is ensured that the output shaft of the motor can rotate normally in the third rotation groove.

[0031] The beneficial effects of the utility model are:

[0032] 1. The PVB film extrusion device ensures that the slider can slide in the first slide groove by providing a first slide groove and a slider, ensures that the user can drive the two sliders to reciprocate through the reciprocating assembly by providing a reciprocating assembly, ensures that when the two sliders reciprocate, the two sliders will drive the dredging rod to reciprocate up and down through the fixed rod by providing a dredging rod, so that the dredging rod dredges the clogged feed box, thereby solving the problem that when the user pours PVB particles into the feed port of the film extrusion device, the feed port of the film extrusion device may be clogged due to too many PVB particles entering, thereby reducing the working efficiency.

[0033] 2. The PVB film extrusion device ensures that the baffle can slide in the through groove by setting the through groove and ensures that when the dredging rod moves up and down, the PVB particles splashing in the feed box will be blocked by the baffle. The fixed component is set to ensure that the user can fix the baffle in the through groove through the fixed component and cannot move. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0035] Figure 2 This is one of the internal structure diagrams of the feed box of the utility model;

[0036] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0037] Figure 4 This is the second schematic diagram of the internal structure of the feed box of the utility model;

[0038] Figure 5 This is the third schematic diagram of the internal structure of the feed box of the utility model.

[0039] The symbols in the figure are:

[0040] 1. Film extrusion device body; 2. Feed box; 3. Through slot; 4. Baffle; 5. First slide slot; 6. Slider; 7. Fixed rod; 8. Clearing rod; 9. Extrusion slot; 10. Second slide slot; 11. Insert rod; 12. Spring; 13. First rotating slot; 14. Turntable; 15. Transmission block; 16. Movable slot; 17. First sprocket; 18. Second sprocket; 19. Chain; 20. Second rotating slot; 21. Turning rod; 22. Third rotating slot; 23. Worm wheel; 24. Worm; 25. Motor. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0045] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0046] Embodiment 1:

[0047] See also Figure 1 - Figure 5 As shown, this embodiment provides a PVB film extrusion device, comprising:

[0048] A film extrusion device body 1 and a feed box 2, wherein the feed box 2 is fixedly connected to the film extrusion device body 1, a through slot 3 is provided on the feed box 2, and a baffle 4 is slidably connected in the through slot 3;

[0049] A limit assembly, which is located in the feed box 2 and is used to fix the baffle 4;

[0050] Two first chutes 5, the two first chutes 5 are symmetrically arranged on the inner wall of the feed box 2, two sliders 6 are slidably connected in the two first chutes 5, a fixing rod 7 is fixedly connected between the two sliders 6, and a dredging rod 8 is fixedly connected to the bottom surface of the fixing rod 7;

[0051] Two extrusion grooves 9, the two extrusion grooves 9 are respectively opened on the two slide blocks 6;

[0052] The reciprocating assembly is located in the feed box 2 and is used to drive the two sliders 6 to move back and forth.

[0053] Embodiment 2:

[0054] This embodiment provides a PVB film extrusion device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the limiting component includes:

[0055] The second slide groove 10 is opened on the inner wall of the through groove 3, and an insertion rod 11 is slidably connected in the second slide groove 10, and one end of the insertion rod 11 passes through the baffle 4 and extends into the baffle 4 to be plugged into the baffle 4, and a spring 12 fixed to the inner wall of the second slide groove 10 is fixedly connected to the insertion rod 11.

[0056] When in use, the user pulls the rod 11 by hand to allow one end of the rod 11 to enter the second slide groove 10 from the baffle 4, and allows the rod 11 to compress the spring 12. At this time, the fixation of the baffle 4 is released, and then the user slides the baffle 4 by hand to allow the baffle 4 to slide along the through groove 3. When the baffle 4 slides to a suitable position, the inner cavity of the feed box 2 will be exposed to the outside world. Then the user pours the PVB particles into the feed box 2, and then the user slides the baffle 4 in the opposite direction by hand. When the baffle 4 moves in the opposite direction to a suitable position, the user releases the hand pulling the rod 11, and allows one end of the rod 11 to be inserted into the baffle 4 under the action of the rebound force of the spring 12, ensuring that the user can fix the baffle 4 in the through groove 3 and cannot move.

[0057] Embodiment 3:

[0058] This embodiment provides a PVB film extrusion device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the insertion rod 11 is "L"-shaped.

[0059] Here, it is ensured that the user can drive one end of the insertion rod 11 to move through the other end of the insertion rod 11.

[0060] Embodiment 4:

[0061] This embodiment provides a PVB film extrusion device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the reciprocating component includes:

[0062] Two first rotating grooves 13, the two first rotating grooves 13 are symmetrically arranged in the feed box 2 and are respectively connected to the two first chutes 5, a rotating disk 14 is rotatably connected in the first rotating groove 13, a transmission block 15 is fixedly connected to the rotating disk 14, and one end of the transmission block 15 extends into the slider 6 and is slidably connected to the slider 6;

[0063] Two movable grooves 16, the two movable grooves 16 are symmetrically opened in the feed box 2 and are respectively connected to the two first rotating grooves 13, a first sprocket 17 and a second sprocket 18 are rotatably connected in the movable grooves 16, and one end of the first sprocket 17 extends into the first rotating groove 13 and is fixed to the rotating disk 14, and a chain 19 is meshed between the first sprocket 17 and the second sprocket 18;

[0064] A second rotating groove 20 is provided in the feed box 2 and communicates with the two movable grooves 16. A rotating rod 21 is rotatably connected in the second rotating groove 20, and two ends of the rotating rod 21 extend into the two movable grooves 16 and are fixed to the two second sprocket wheels 18 respectively;

[0065] A third rotating groove 22, which is provided on the inner wall of the second rotating groove 20 and communicated with the outside, a worm wheel 23 fixed to the rotating rod 21 is rotatably connected in the third rotating groove 22, and a worm 24 rotatable with the third rotating groove 22 is meshed on the worm wheel 23;

[0066] The motor 25 is fixedly connected to the feed box 2 , and the output shaft of the motor 25 extends into the third rotating groove 22 and is fixed to the worm 24 .

[0067] Among them, when the PVB particles enter the feed box 2 and get blocked, the user starts the motor 25, and the output shaft of the motor 25 drives the worm 24 to rotate in the third rotating groove 22, so that the worm 24 drives the worm wheel 23 to rotate in the third rotating groove 22, and the worm wheel 23 drives the rotating rod 21 to rotate in the second rotating groove 20. When the rotating rod 21 rotates, the two ends of the rotating rod 21 will drive the two second sprocket wheels 18 to rotate in the two movable grooves 16 respectively. When the two second sprocket wheels 18 rotate, the two second sprocket wheels 18 will respectively drive the two first sprocket wheels 17 to rotate through the two chains 19, so that one end of the two first sprocket wheels 17 respectively drives the two turntables 14 to rotate in the two first rotating grooves 13. When the two When the turntable 14 rotates, the two turntables 14 will respectively drive the two transmission blocks 15 to slide in the two extrusion grooves 9, so that the two sliders 6 can move back and forth up and down in the two first slide grooves 5 respectively, and the two sliders 6 can drive the dredging rod 8 to move back and forth up and down through the fixed rod 7 to dredge the PVB particles blocked in the feed box 2. At the same time, when the dredging rod 8 dredges the PVB particles, some of the PVB particles will splash and be blocked by the baffle 4 and fall back into the feed box 2, ensuring that when the PVB particles block the feed box 2, the PVB particles can be pushed into the film extrusion device body 1 by the dredging rod 8. Then the user starts the film extrusion device body 1 to allow the film extrusion device body 1 to process the PVB particles.

[0068] Embodiment 5:

[0069] This embodiment provides a PVB film extrusion device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: one end of the first sprocket 17 is rotatably connected to the first rotating groove 13, and both ends of the rotating rod 21 are rotatably connected to the two movable grooves 16 respectively.

[0070] Here, it is ensured that one end of the first sprocket 17 can rotate normally in the first rotating groove 13 , and it is ensured that both ends of the rotating rod 21 can rotate normally in the two movable grooves 16 respectively.

[0071] Embodiment 6:

[0072] This embodiment provides a PVB film extrusion device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the output shaft of the motor 25 is rotatably connected to the third rotating groove 22 .

[0073] Here, it is ensured that the output shaft of the motor 25 can rotate normally in the third rotation groove 22 .

[0074] When in use, the user pulls the insertion rod 11 by hand, allowing one end of the insertion rod 11 to enter the second sliding groove 10 from the baffle 4, and allowing the insertion rod 11 to compress the spring 12. At this time, the fixation of the baffle 4 is released, and then the user slides the baffle 4 by hand to slide along the through groove 3. When the baffle 4 slides to a suitable position, the inner cavity of the feed box 2 will be exposed to the outside world. Then the user pours PVB particles into the feed box 2, and then the user slides the baffle 4 in the opposite direction by hand. When the baffle 4 moves in the opposite direction to a suitable position, the user releases the baffle 4. Open the hand that pulls the insertion rod 11, and let one end of the insertion rod 11 be inserted into the baffle 4 under the action of the rebound force of the spring 12, so that the user can fix the baffle 4 in the through groove 3 and cannot move. When the PVB particles enter the feed box 2 and get blocked, the user starts the motor 25, and the output shaft of the motor 25 drives the worm 24 to rotate in the third rotating groove 22, so that the worm 24 drives the worm wheel 23 to rotate in the third rotating groove 22, and the worm wheel 23 drives the rotating rod 21 to rotate in the second rotating groove 20. When the rotating rod 21 rotates, the rotating rod 2 The two ends of the two second sprockets 18 will drive the two second sprockets 18 to rotate in the two movable grooves 16 respectively. When the two second sprockets 18 rotate, the two second sprockets 18 will respectively drive the two first sprockets 17 to rotate through the two chains 19, so that one end of the two first sprockets 17 respectively drives the two rotating disks 14 to rotate in the two first rotating grooves 13. When the two rotating disks 14 rotate, the two rotating disks 14 will respectively drive the two transmission blocks 15 to slide in the two extrusion grooves 9, so that the two sliders 6 can move up and down in the two first sliding grooves 5 respectively. The two sliders 6 drive the unblocking rod 8 to move reciprocally up and down through the fixed rod 7 to unblock the PVB particles blocked in the feed box 2. At the same time, when the unblocking rod 8 unblocks the PVB particles, some of the PVB particles will splash and be blocked by the baffle 4 and fall back into the feed box 2 to ensure that when the PVB particles block the feed box 2, the PVB particles can be pushed into the film extrusion device body 1 by the unblocking rod 8. Then the user starts the film extrusion device body 1 to allow the film extrusion device body 1 to process the PVB particles.

[0075] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A PVB film extrusion device, characterized in that: include: A film extrusion device body (1) and a feed box (2), wherein the feed box (2) is fixedly connected to the film extrusion device body (1), a through slot (3) is provided on the feed box (2), and a baffle (4) is slidably connected in the through slot (3); A limiting assembly, the limiting assembly being located in the feed box (2) and being used to fix the baffle (4); Two first slide grooves (5), the two first slide grooves (5) are symmetrically arranged on the inner wall of the feed box (2), two sliders (6) are slidably connected in the two first slide grooves (5), a fixing rod (7) is fixedly connected between the two sliders (6), and a dredging rod (8) is fixedly connected to the bottom surface of the fixing rod (7); Two extrusion grooves (9), the two extrusion grooves (9) are respectively arranged on the two slide blocks (6); A reciprocating assembly is located in the feed box (2) and is used to drive two sliders (6) to move back and forth.

2. A PVB film extrusion device according to claim 1, characterized in that: The limiting component comprises: A second slide groove (10), the second slide groove (10) is provided on the inner wall of the through groove (3), an insertion rod (11) is slidably connected in the second slide groove (10), and one end of the insertion rod (11) passes through the baffle (4) and extends into the baffle (4) to be plugged into the baffle (4), and a spring (12) fixed to the inner wall of the second slide groove (10) is fixedly connected to the insertion rod (11).

3. A PVB film extrusion device according to claim 2, characterized in that: The insertion rod (11) is in an "L" shape.

4. A PVB film extrusion device according to claim 1, characterized in that: The reciprocating assembly comprises: Two first rotating grooves (13), the two first rotating grooves (13) are symmetrically arranged in the feed box (2) and are respectively connected to the two first slide grooves (5), a rotating disk (14) is rotatably connected in the first rotating groove (13), a transmission block (15) is fixedly connected to the rotating disk (14), and one end of the transmission block (15) extends into the slider (6) and is slidably connected to the slider (6); Two movable grooves (16), the two movable grooves (16) are symmetrically arranged in the feed box (2) and are respectively connected to the two first rotating grooves (13), a first sprocket (17) and a second sprocket (18) are rotatably connected in the movable grooves (16), and one end of the first sprocket (17) extends into the first rotating groove (13) and is fixed to the rotating disk (14), and a chain (19) is meshed between the first sprocket (17) and the second sprocket (18); A second rotating groove (20), the second rotating groove (20) is arranged in the feed box (2) and is connected to the two movable grooves (16), a rotating rod (21) is rotatably connected in the second rotating groove (20), and two ends of the rotating rod (21) respectively extend into the two movable grooves (16) and are fixed to the two second sprocket wheels (18); a third rotating groove (22), the third rotating groove (22) being formed on the inner wall of the second rotating groove (20) and being in communication with the outside, a worm wheel (23) fixed to the rotating rod (21) being rotatably connected in the third rotating groove (22), and a worm (24) being meshed with the worm wheel (23) and rotatable with the third rotating groove (22); A motor (25) is fixedly connected to the feed box (2), and an output shaft of the motor (25) extends into the third rotating groove (22) and is fixed to the worm (24).

5. A PVB film extrusion device according to claim 4, characterized in that: One end of the first sprocket (17) is rotatably connected to the first rotating groove (13), and both ends of the rotating rod (21) are rotatably connected to the two movable grooves (16) respectively.

6. A PVB film extrusion device according to claim 4, characterized in that: The output shaft of the motor (25) is rotationally connected to the third rotation groove (22).

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