PVB (polyvinyl butyral) film twin-screw extrusion device

Abstract

The utility model provides a PVB (Polyvinyl Butyral) film twin-screw extrusion device, which relates to the field of PVB processing and comprises a box body structure, a processing cylinder, a driving device and a screw transmission device are arranged on the box body structure, two mutually meshed screws are pivoted in the processing cylinder, a heating device is arranged on the processing cylinder, a discharge port is arranged at one end of the processing cylinder, the upper end of the processing cylinder is communicated with a feeding cylinder, and the feeding cylinder is communicated with the driving device. A plurality of feeding pipes are arranged at the upper end of the feeding barrel, the stirring mechanism comprises a stirring shaft and a plurality of connecting rods on the stirring shaft, the tail ends of the connecting rods are connected with stirring scrapers, the stirring scrapers are matched with the inner wall of the feeding barrel, and the stirring transmission mechanism drives the stirring shaft to rotate by being connected with a driving device. The group of belt pulleys are respectively arranged on the motor and the transmission shaft, the belt pulleys are mutually meshed, and the motor transmits power to the stirring mechanism through the 90-degree transmission mechanism, so that various PVB raw materials are stirred and mixed, and the defect of poor mixing effect of the screw rod is overcome.

Description

Technical Field

[0001] This utility model relates to the field of PVB processing technology, specifically to a twin-screw extrusion device for PVB film. Background Technology

[0002] PVB film is a widely used interlayer film material with important applications in architectural glass, automotive glass, and other fields. The twin-screw extruder is a key piece of equipment in the PVB film production process; its working principle involves two meshing screws that forward-feed, mix, plasticize, and extrude the material.

[0003] Existing twin-screw extruders for PVB films have some problems during use. For example, the screw's mixing effect is poor, leading to uneven plasticization of the material and affecting the quality of the PVB film. For instance, patent CN201821178401.6 discloses a PVB twin-screw extruder, aiming to provide a PVB twin-screw extruder with strong controllable heating temperature, simple structure, and high practicality. The key technical point is that a heating device is provided on the outer wall of the barrel. The heating device includes several heaters and a heat-conducting component disposed between the heaters and the barrel. The heat-conducting component includes a covering body, which is connected to the outer wall of the barrel to form a filling cavity. The filling cavity is filled with water and covers the outside of the barrel. The filling cavity has a filling outlet with a plug. This utility model is applicable to the field of PVB film production equipment technology.

[0004] In the aforementioned patent, if multiple raw materials are added to the feeder (hopper), the raw materials enter the screw without being fully mixed, resulting in poor mixing effect.

[0005] Therefore, there is an urgent need to design a new type of twin-screw extrusion device for PVB film to solve the above problems. Summary of the Invention

[0006] Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a twin-screw extrusion device for PVB film, which solves the problems mentioned in the background section.

[0008] Technical solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a twin-screw extrusion device for PVB film, comprising a housing structure, a processing cylinder mounted on the upper end of the housing structure, an operation panel mounted beside the processing cylinder, two meshing screws pivotally connected inside the processing cylinder, a heating device mounted on the processing cylinder, a discharge port at one end of the processing cylinder, and a drive device and a screw transmission device at the other end. The two screws are driven by the drive device to drive the screw transmission device. A feed cylinder is connected to the upper end of the processing cylinder, and multiple feed pipes are mounted on the upper end of the feed cylinder. A stirring mechanism is vertically rotatably mounted in the middle of the feed cylinder. The stirring mechanism includes a stirring shaft, several connecting rods mounted on the stirring shaft, and a stirring scraper connected to the end of each connecting rod. The stirring scraper is adapted to the inner wall of the feed cylinder. The device also includes a stirring transmission mechanism, which drives the stirring shaft to rotate via a connection to the drive device.

[0010] Preferably, a feed screw is provided at the lower end of the stirring shaft.

[0011] Preferably, the driving device is a motor, which is located on one side of the processing cylinder. The screw transmission device includes a driving wheel and a set of driven wheels. The driving wheel is located on the output end of the motor, and the set of driven wheels is located on the output ends of the two screws. The driving wheel is rotatably connected in the middle of the set of driven wheels and meshes with the set of driven wheels.

[0012] Preferably, the stirring drive includes a 90-degree transmission mechanism, a set of pulleys and a belt. The 90-degree transmission mechanism includes a support frame connected to the upper end of the feed cylinder. Vertical bearings and horizontal bearings are respectively provided at both ends of the support frame, with the center lines of the vertical and horizontal bearings arranged at 90 degrees. The stirring shaft is rotatably connected in the vertical bearing, and a drive shaft is rotatably connected in the horizontal bearing. Hinges are respectively provided at the proximal ends of the stirring shaft and the drive shaft. Hinges are hinged to the two hinges, and a bend rod is connected between the two hinges. A set of pulleys is respectively provided on the drive shaft and the output shaft of the motor, and the belt meshes with the two pulleys respectively.

[0013] Preferably, it also includes a protective housing, which is disposed around the drive device and the screw drive device. Beneficial effects

[0014] This invention provides a twin-screw extrusion device for PVB film. It has the following advantages:

[0015] This PVB film twin-screw extruder incorporates a stirring mechanism within the feed cylinder. This stirring mechanism is connected to a motor via a stirring transmission mechanism. The stirring transmission mechanism includes a set of pulleys, a belt, and a 90-degree transmission mechanism. By mounting the pulleys on the motor and the drive shaft respectively, and having them mesh with each other, the motor transmits power to the stirring mechanism through the 90-degree transmission mechanism. This achieves the mixing of various PVB raw materials, reducing the defects of poor mixing effect caused by screw extrusion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a twin-screw extrusion device for PVB film according to this utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of a twin-screw extrusion device for PVB film according to this utility model. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the 90-degree transmission mechanism and stirring mechanism of the twin-screw extrusion device of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of a twin-screw extrusion device for PVB film according to this utility model.

[0020] In the diagram: 1. Box body mechanism; 2. Processing cylinder; 3. Control panel; 4. Screw; 5. Feed cylinder; 6. Feed pipe; 71. Stirring shaft; 72. Connecting rod; 73. Stirring scraper; 8. Feeding screw; 9. Motor; 10. Drive wheel; 11. Driven wheel; 12. Support; 13. Vertical bearing; 14. Horizontal bearing; 15. Drive shaft; 16. Hinge joint; 17. Hinge rod; 18. Angle rod; 19. Pulley; 20. Belt; 21. Protective shell; 22. Discharge port. Detailed Implementation

[0021] This utility model embodiment provides a twin-screw four-stage extrusion device for PVB film, such as... Figure 1-4As shown, the device includes a box structure: a processing cylinder 2 is mounted on the upper end of the box structure, an operation panel 3 is arranged beside the processing cylinder 2, two meshing screws 4 are pivotally connected inside the processing cylinder 2, a heating device is provided on the processing cylinder 2, a discharge port 22 is provided at one end of the processing cylinder 2, a drive device for driving the screws 4 to rotate, and a screw 4 transmission device is connected between the drive device and the two screws 4, the upper end of the processing cylinder 2 is connected to a feeding cylinder 5, multiple feeding pipes 6 are provided at the upper end of the feeding cylinder 5, and a stirring mechanism is vertically rotatably arranged in the middle of the feeding cylinder 5, the stirring mechanism includes a stirring shaft 71, several connecting rods 72 are arranged on the stirring shaft 71, the ends of the connecting rods 72 are connected to stirring scrapers 73, the stirring scrapers 73 are adapted to the inner wall of the feeding cylinder 5, and a stirring transmission mechanism is also included, the stirring transmission mechanism drives the stirring shaft 71 to rotate through the connection of the drive device.

[0022] The screw 4 may also include a conveying section, a mixing section and a plasticizing section. The screw 4 in the mixing section is provided with multiple intersecting threaded blocks. The surface of the threaded blocks is provided with protrusions. The protrusions are serrated. A material mixing cavity is formed between adjacent threaded blocks (illustrated in the figure).

[0023] like Figure 1 and Figure 3 As shown, a feed screw 84 is provided at the lower end of the stirring shaft 71. The feed screw 84 further mixes the raw materials and brings them into the processing cylinder 2.

[0024] like Figure 1 and 2 As shown, in this embodiment, the driving device is a motor 9, which is located on one side of the processing cylinder 2. Figure 2 and Figure 4 As shown, the screw 4 transmission device in this embodiment includes a driving wheel 10 and a set of driven wheels 11. The driving wheel 10 is located on the output end of the motor 9, and the set of driven wheels 11 is located on the output ends of the two screws 4. The driving wheel 10 is rotatably connected in the middle of the set of driven wheels 11 and meshes with the set of driven wheels 11.

[0025] like Figure 1 and Figure 2 , Figure 3As shown, in this embodiment, the stirring drive includes a 90-degree transmission mechanism, a set of pulleys 19 and a belt 20. The 90-degree transmission mechanism includes a bracket 12, which is connected to the upper end of the feed cylinder 5. Vertical bearings 13 and horizontal bearings 14 are respectively provided at both ends of the bracket 12. The center lines of the vertical bearings 13 and horizontal bearings 14 are arranged at 90 degrees. The stirring shaft 71 is rotatably connected in the vertical bearing 13. A transmission shaft 15 is rotatably connected in the horizontal bearing 14. Hinges 16 are respectively provided at the near ends of the stirring shaft 71 and the transmission shaft 15. Hinges 17 are hinged on the two hinges 16, and angle rods 18 are connected between the two hinges 17. A set of pulleys 19 are respectively provided on the transmission shaft 15 and the output shaft of the motor 9. The belt 20 meshes with the two pulleys 19 respectively.

[0026] like Figure 1 and Figure 2 As shown, it also includes a protective housing 21, which is disposed around the drive device and the screw 4 transmission device to improve processing safety.

[0027] Working principle: This PVB film twin-screw 4 extrusion device has a stirring mechanism installed in the feed cylinder 5. The stirring mechanism is connected to the motor 9 through a stirring transmission mechanism. The stirring transmission mechanism includes a set of pulleys 19, a belt 20, and a 90-degree transmission mechanism. The pulleys 19 are respectively set on the motor 9 and the transmission shaft 15. The pulleys 19 mesh with each other. The motor 9 transmits power to the stirring mechanism through the 90-degree transmission mechanism to achieve stirring and mixing of various PVB raw materials, thereby reducing the defect of poor mixing effect of the screw 4. The output shaft of the motor 9 drives the drive wheel 10 to rotate, which drives the set of driven wheels 11 meshing with it to rotate, and then drives the two screws 4 to rotate. Combined with the heating device on the processing cylinder 2, the mixing, heating and melting of various raw materials and extrusion are completed.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A twin-screw extrusion device for PVB film, comprising a housing structure (1) characterized in that: The upper end of the box structure (1) is equipped with a processing cylinder (2), and an operation panel (3) is provided next to the processing cylinder (2). Two meshing screws (4) are pivotally connected inside the processing cylinder (2). A heating device is provided on the processing cylinder (2). A discharge port (22) is provided at one end of the processing cylinder (2), and a drive device and a screw transmission device are provided at the other end. The two screws (4) are driven by the drive device to drive the screw transmission device. The upper end of the processing cylinder (2) is connected to a feeding cylinder (5). Multiple feeding pipes (6) are provided at the upper end of the feeding cylinder (5). A stirring mechanism is vertically rotatably provided in the middle of the feeding cylinder (5). The stirring mechanism includes a stirring shaft (71), and several connecting rods (72) are provided on the stirring shaft (71). The end of the connecting rod (72) is connected to a stirring scraper (73). The stirring scraper (73) is adapted to the inner wall of the feeding cylinder (5). It also includes a stirring transmission mechanism. The stirring transmission mechanism drives the stirring shaft (71) to rotate by connecting to the drive device.

2. The twin-screw extruder for PVB film according to claim 1, characterized in that: The lower end of the stirring shaft (71) is provided with a feed screw (8).

3. The twin-screw extruder for PVB film according to claim 1, characterized in that: The driving device is a motor (9), which is located on one side of the processing cylinder (2). The screw transmission device includes a driving wheel (10) and a set of driven wheels (11). The driving wheel (10) is located on the output end of the motor (9), and the set of driven wheels (11) is located on the output end of the two screws (4). The driving wheel (10) is rotatably connected in the middle of the set of driven wheels (11) and meshes with the set of driven wheels (11).

4. The twin-screw extruder for PVB film according to claim 3, characterized in that: The stirring drive includes a 90-degree transmission mechanism, a set of pulleys (19) and a belt (20). The 90-degree transmission mechanism includes a bracket (12). The bracket (12) is connected to the upper end of the feed cylinder (5). The two ends of the bracket (12) are respectively provided with a vertical bearing (13) and a horizontal bearing (14). The center lines of the vertical bearing (13) and the horizontal bearing (14) are arranged at 90 degrees. The stirring shaft (71) is rotatably connected in the vertical bearing (13). The horizontal bearing (14) is rotatably connected with a transmission shaft (15). The stirring shaft (71) and the transmission shaft (15) are respectively provided with hinge joints (16) at their near ends. The two hinge joints (16) are hinged with hinge rods (17). The two hinge rods (17) are connected with a bend rod (18). A set of pulleys (19) are respectively provided on the output shaft of the transmission shaft (15) and the motor (9). The belt (20) meshes with the two pulleys (19).

5. A twin-screw extruder for PVB film according to claim 1 or 4, characterized in that: It also includes a protective housing (21), which is disposed around the drive unit and the screw drive unit.

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