Parallel double-screw extruder

Abstract

The utility model discloses a parallel double-screw extruder which comprises a machine barrel, a hopper fixedly mounted at the top of the machine barrel, a machine head connector fixedly connected to one end of the machine barrel, a perforated plate mounted in the machine head connector and two extrusion screws rotationally mounted in the machine barrel, and two groups of vertically-penetrating through grooves are formed in the top and the bottom of the machine barrel; filter pore plates movably inserted into the through groove are arranged above and below the extrusion screw rod; and the size of filter pores of the filter pore plate far away from one side of the hopper is larger than that of filter pores of the porous plate and smaller than that of filter pores of the filter pore plate close to one side of the hopper. According to the utility model, the two groups of filtering pore plates and the porous plate with the filtering pore sizes being reduced in sequence are used for filtering impurities which are difficult to melt and are gradually reduced in size in sequence, and the impurities which are difficult to melt are separately filtered according to the sizes, so that the filtering pore plates and the porous plate are more difficult to block, the downtime required for cleaning is reduced, and the extrusion production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion equipment, in particular to a parallel twin-screw extruder. Background Technique

[0002] The parallel twin-screw extruder has two horizontally arranged extrusion screws. Compared with the single-screw extruder, its mixing and plasticizing effect and extrusion efficiency are higher, the mixing and transmission of plastic masterbatch are more uniform, and the quality of the products produced is also higher, so it is more popular with users.

[0003] During the storage and transportation of plastic masterbatch, due to various objective factors, it is easy to accidentally mix in other impurities. And the raw material particles such as plastic masterbatch are relatively small, and it is difficult to clean out the mixed-in relatively small impurities, which will be mixed into the extruder during extrusion. For some impurities with a melting point higher than that of the plastic masterbatch, they will not be melted by the heating of the extruder, but will be intercepted by the perforated plate in the head connector. When we use the parallel twin-screw extruder, due to its higher heating and extrusion efficiency, its raw material consumption is also faster. All the molten plastic masterbatch in the barrel is extruded from the perforated plate and the head connector, and the sizes of the perforated plate and the head connector are smaller than that of the barrel. The perforated plate of the parallel twin-screw extruder is blocked faster than that of the single-screw extruder, so it needs to be regularly shut down and disassembled for cleaning, which affects high-efficiency production. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a parallel twin-screw extruder, which is used to solve the problem that when the existing parallel twin-screw extruder mixes in impurities that are difficult to melt in the plastic masterbatch, it is easy to cause the perforated plate to be blocked and needs to be regularly shut down and disassembled for cleaning, thus affecting high-efficiency production.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A parallel twin-screw extruder includes a barrel, a hopper fixedly installed on the top of the barrel, a head connector fixedly connected to one end of the barrel, a perforated plate installed inside the head connector, and two extrusion screws rotatably installed in the barrel. Two groups of vertically penetrating through grooves are provided at the top and bottom of the barrel. Filter hole plates are movably inserted above and below the extrusion screws in the through grooves. The pore size of the filter hole plate on the side far from the hopper is larger than the pore size of the perforated plate and smaller than the pore size of the filter hole plate on the side close to the hopper. The width of the through groove is larger than the thickness of the filter hole plate, and the filter hole plate fits on the inner wall of the through groove close to the head connector side. A sealing cover plate is fixedly connected to the top or bottom of the filter hole plate. The sealing cover plate is installed on the outer wall of the barrel through positioning bolts and fastening nuts, and a disassembly and assembly handle is fixedly connected to the sealing cover plate.

[0007] Preferably, mounting grooves are provided at positions corresponding to the through grooves at the top and bottom of the barrel. The width of the mounting groove is greater than the width of the through groove, and the sealing cover plate is installed in the mounting groove.

[0008] Preferably, the positioning bolts are vertically fixed in the mounting groove. The positioning bolts penetrate through the sealing cover plate and are threadedly connected with fastening nuts. A bushing that is movably sleeved on the surface of the positioning bolt is provided between the sealing cover plate and the fastening nut.

[0009] Preferably, both ends of the sealing cover plate are bent to be adapted to the shape of the barrel, and the shape of the bushing is adapted to the shape of the sealing cover plate.

[0010] Preferably, a relief groove is provided at a position corresponding to the extrusion screw on the filter orifice plate. The position of the extrusion screw corresponding to the filter orifice plate is a blank area without spiral blades, and the surface of the shaft of the extrusion screw is slidably connected with the inner wall of the relief groove.

[0011] Preferably, positioning pins and positioning grooves are respectively provided at opposite ends of the upper and lower corresponding filter orifice plates, and the positioning pins are movably inserted into the positioning grooves.

[0012] Preferably, the positioning groove is a groove with one side open, and the open directions of two adjacent positioning grooves are different.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] The present utility model is provided with two sets of filter orifice plates that are inserted and installed up and down on the barrel for filtering impurities that are difficult to melt by heating. The inner diameter of the barrel is larger than the inner diameter of the head connector. The filter orifice plates in the barrel are less likely to be blocked than the perforated plates in the head connector. The two sets of filter orifice plates with gradually decreasing filter hole sizes and the perforated plates are used to filter impurities that are difficult to melt with gradually decreasing sizes. The impurities that are difficult to melt are filtered separately according to their sizes, making the filter orifice plates and the perforated plates less likely to be blocked, thereby reducing the downtime required for cleaning and further improving the extrusion production efficiency. In addition, the filter orifice plates are relatively convenient to disassemble and install, and the time consumed is short, effectively solving the problem that when the existing parallel twin-screw extruder mixes impurities that are difficult to melt in the plastic masterbatch, the perforated plate is easily blocked and needs to be regularly shut down and disassembled for cleaning, which affects the efficient production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the internal structure of the present utility model;

[0016] Figure 2 is a partial structural schematic diagram at the position corresponding to the filter orifice plate of the present utility model;

[0017] Figure 3Side view of the corresponding position of the filter orifice plate of the present utility model;

[0018] Figure 4 Side sectional view of the corresponding position of the filter orifice plate of the present utility model;

[0019] Figure 5 Side view of the assembly structure of the sealing cover plate of the present utility model;

[0020] Figure 6 Side view of the filter orifice plate of the present utility model;

[0021] Figure 7 Top view sectional view of the filter orifice plate corresponding to the positioning groove of the present utility model.

[0022] In the figure: 1, barrel; 101, mounting groove; 2, hopper; 3, head connector; 4, perforated plate; 5, extrusion screw; 6, through groove; 7, filter orifice plate; 701, relief groove; 702, positioning pin; 703, positioning groove; 8, sealing cover plate; 9, positioning bolt; 10, fastening nut; 11, disassembly and assembly handle; 12, bushing. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figure 1-7 shown, the present utility model provides a technical solution: a parallel twin-screw extruder, including a barrel 1, a hopper 2 fixedly installed on the top of the barrel 1, a head connector 3 fixedly connected to one end of the barrel 1, a perforated plate 4 installed inside the head connector 3, and two extrusion screws 5 rotatably installed in the barrel 1. Two groups of vertically penetrating through grooves 6 are provided at the top and bottom of the barrel 1. Filter orifice plates 7 are movably inserted above and below the extrusion screws 5 and are inserted into the through grooves 6. The pore size of the filter orifice plate 7 on the side away from the hopper 2 is larger than the pore size of the perforated plate 4 and smaller than the pore size of the filter orifice plate 7 on the side close to the hopper 2;

[0025] A relief groove 701 is provided at the position of the filter orifice plate 7 corresponding to the extrusion screw 5. The position of the extrusion screw 5 corresponding to the filter orifice plate 7 is a blank area without helical blades. The surface of the shaft of the extrusion screw 5 is slidably connected to the inner wall of the relief groove 701. Opposite ends of the filter orifice plates 7 corresponding to each other up and down are respectively provided with a positioning pin 702 and a positioning groove 703. The positioning pin 702 is movably inserted into the positioning groove 703. The positioning groove 703 is a groove with one side open, and the open directions of two adjacent positioning grooves 703 are different;

[0026] The width of the through groove 6 is greater than the thickness of the filter orifice plate 7, and the filter orifice plate 7 is attached to the inner wall of the through groove 6 close to the head connector 3. A sealing cover plate 8 is fixedly connected to the top or bottom of the filter orifice plate 7. The sealing cover plate 8 is installed on the outer wall of the barrel 1 through a positioning bolt 9 and a fastening nut 10. Installation grooves 101 are provided at the positions of the top and bottom of the barrel 1 corresponding to the through groove 6. The width of the installation groove 101 is greater than the width of the through groove 6. The sealing cover plate 8 is installed in the installation groove 101, and a disassembly and assembly handle 11 is fixedly connected to the sealing cover plate 8;

[0027] The positioning bolt 9 is vertically fixed in the installation groove 101. The positioning bolt 9 penetrates through the sealing cover plate 8 and is threadedly connected to the fastening nut 10. A bushing 12 that is movably sleeved on the surface of the positioning bolt 9 is provided between the sealing cover plate 8 and the fastening nut 10. Both ends of the sealing cover plate 8 are bent structures that are adapted to the shape of the barrel 1. The shape of the bushing 12 is adapted to the shape of the sealing cover plate 8.

[0028] Working principle: The inner diameter of the barrel 1 is larger than the inner diameter of the head connector 3. The filter orifice plate 7 in the barrel 1 is less likely to be blocked than the perforated plate 4 in the head connector 3. Two groups of filter orifice plates 7 and perforated plates 4 with gradually decreasing filter hole sizes are used to filter the difficult-to-melt impurities with gradually decreasing sizes in sequence. The difficult-to-melt impurities are filtered separately according to their sizes, making the filter orifice plates 7 and the perforated plates 4 less likely to be blocked, thereby reducing the downtime required for cleaning and further improving the extrusion production efficiency.

[0029] It should be noted that in this article, terms such as "including", "comprising" 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 not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A parallel twin-screw extruder, comprising a barrel (1), a hopper (2) fixedly installed at the top of the barrel (1), a head connector (3) fixedly connected to one end of the barrel (1), a perforated plate (4) installed inside the head connector (3), and two extrusion screws (5) rotatably installed in the barrel (1), characterized in that: Two sets of vertically penetrating through slots (6) are provided at the top and bottom of the barrel (1). Filter hole plates (7) that are movably inserted into the through slots (6) are provided above and below the extrusion screw (5). The pore size of the filter hole plate (7) on the side away from the hopper (2) is larger than the pore size of the perforated plate (4) and smaller than the pore size of the filter hole plate (7) on the side close to the hopper (2). The width of the through slot (6) is larger than the thickness of the filter hole plate (7), and the filter hole plate (7) is attached to the inner wall of the through slot (6) on the side close to the head connector (3). A sealing cover plate (8) is fixedly connected to the top or bottom of the filter hole plate (7). The sealing cover plate (8) is installed on the outer wall of the barrel (1) through a positioning bolt (9) and a fastening nut (10). A disassembly and assembly handle (11) is fixedly connected to the sealing cover plate (8).

2. The parallel twin-screw extruder according to claim 1, wherein: Installation grooves (101) are provided at the top and bottom of the barrel (1) corresponding to the positions of the through slots (6). The width of the installation groove (101) is larger than the width of the through slot (6). The sealing cover plate (8) is installed in the installation groove (101).

3. The parallel twin-screw extruder according to claim 1, characterized in that: The positioning bolt (9) is vertically fixed in the installation groove (101). The positioning bolt (9) penetrates through the sealing cover plate (8) and is threadedly connected to the fastening nut (10). A bushing (12) that is movably sleeved on the surface of the positioning bolt (9) is provided between the sealing cover plate (8) and the fastening nut (10).

4. The parallel twin-screw extruder according to claim 3, characterized in that: Both ends of the sealing cover plate (8) are in a curved structure and are adapted to the shape of the barrel (1). The shape of the bushing (12) is adapted to the shape of the sealing cover plate (8).

5. The parallel twin-screw extruder according to claim 1, characterized in that: A relief groove (701) is provided at the position of the filter hole plate (7) corresponding to the extrusion screw (5). The position of the extrusion screw (5) corresponding to the filter hole plate (7) is a non - helical blade blank area. The surface of the shaft of the extrusion screw (5) is slidably connected to the inner wall of the relief groove (701).

6. The parallel twin-screw extruder according to claim 1, wherein: Positioning pins (702) and positioning grooves (703) are respectively provided at the opposite ends of the upper and lower corresponding filter hole plates (7). The positioning pin (702) is movably inserted into the positioning groove (703).

7. The parallel twin-screw extruder according to claim 6, wherein: The positioning groove (703) is a groove with one side open, and the open directions of two adjacent positioning grooves (703) are different.

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