Special plastic extruder screw for material homogenization

Abstract

The utility model discloses a special plastic extruder screw for material homogenization, which comprises an inlet section screw, the left end of the inlet section screw is provided with a homogenization sieve plate, the wall surrounding edge of the homogenization sieve plate is provided with a discharge hole, the right end of the inlet section screw is connected with a melting section screw, the right end of the melting section screw is connected with an outlet section screw, and the outlet section screw is connected with a screw rod. An inlet spiral sheet is fixedly arranged on the surface of the inlet section screw rod, and a melting section spiral sheet is fixedly arranged on the surface of the melting section screw rod; the homogenizing sieve plate is arranged on the inlet section of the inlet section screw rod, the discharge hole is formed in the wall surrounding edge of the homogenizing sieve plate, the discharge hole and the homogenizing sieve plate are combined to form a screen type structure, and the discharge hole adopts a gradual change inlet structure and is gradually extended and thinned, so that a feeding path is extended to form a thread which is gradually thinned, and materials are more easily stabilized and homogenized; and meanwhile, the large particles and the small particles are gradually molten in the initial direction, and the melting effect is finally achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of special plastic processing, in particular to a screw of a special plastic extruder for material homogenization. Background Technique

[0002] With the application of special engineering plastics in more and more fields, various types of extruder screws are developing towards specialization, but it is difficult to cover and match all problems. A series of problems, including extrusion stability performance, extrusion pressure problems, and wear problems, affect product quality.

[0003] Bubbles generated by existing ordinary screws during the extrusion processing of special plastics affect product performance. The initial feeding pressure is insufficient, and the initial pressure is insufficient for processing low-viscosity materials, resulting in initial slipping of the sample material. When processing high-viscosity materials, the adhesion to the machine wall causes uneven discharging at the discharge port. The screw is prone to wear, and it is difficult to replace the whole screw, and the versatility is poor.

[0004] Therefore, the technical personnel in this field provide a screw of a special plastic extruder for material homogenization to solve the problems raised in the above background technique. Content of the Utility Model

[0005] The purpose of the utility model is to provide a screw of a special plastic extruder for material homogenization to solve the problems of insufficient initial pressure, uneven discharging, and poor versatility of the existing screw when in use as raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution:

[0007] A screw of a special plastic extruder for material homogenization, including: an inlet section screw, a homogenization screen plate for homogenizing materials is installed at the left end of the inlet section screw, discharge holes for homogenizing discharge are arranged on the circumferential wall edge of the homogenization screen plate, the discharge holes are distributed in a ring around the center of the homogenization screen plate, and the diameter of the discharge holes gradually becomes thinner from the inlet to the outlet. The right end of the inlet section screw is connected to a melting section screw, and the right end of the melting section screw is connected to an outlet section screw. An inlet spiral blade is fixedly arranged on the surface of the inlet section screw, a melting section spiral blade is fixedly arranged on the surface of the melting section screw, and an outlet section spiral blade is fixedly arranged on the surface of the outlet section screw. The inlet section screw and the melting section screw are in threaded connection, the melting section screw and the outlet section screw are in threaded connection, and the inlet section screw, the melting section screw, and the outlet section screw are all on the same straight line.

[0008] As a further scheme in the utility model, the pitch of the inlet spiral blade gradually becomes smaller to the pitch of the melting section spiral blade, and the pitch of the melting section spiral blade gradually becomes larger to the pitch of the outlet section spiral blade.

[0009] As a further solution in the present utility model, a connecting shaft head is connected to one side of the homogenizing sieve plate.

[0010] As a further solution in the present utility model, docking holes are provided at both ends of the melting section screw rod. Docking threaded rods are integrally connected to the connecting ends of the inlet section screw rod and the outlet section screw rod with the melting section screw rod. The docking threaded rods and the docking holes cooperate with each other to form a threaded connection.

[0011] As a further solution in the present utility model, bolt holes are provided at both ends of the melting section screw rod, and connecting bolts for fastening are arranged inside the bolt holes.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. A homogenizing sieve plate is arranged at the inlet section of the inlet section screw rod. Discharge holes are arranged on the surrounding wall edge of the homogenizing sieve plate. The discharge holes are distributed in a ring around the center of the homogenizing sieve plate, and the diameter of the discharge holes gradually becomes thinner from the inlet to the outlet. The combination of the discharge port and the homogenizing sieve plate forms a screen-like structure, and the discharge holes adopt a gradually changing inlet structure, gradually extending and becoming thinner, so that the path of the discharged material extends into a gradually changing thin thread, making it easier for the material to be stably homogenized. At the same time, large particles and small particles are gradually melted along the initial direction, and finally a melting effect is obtained. This operation can not only achieve the melting effect in the initial stage, but also reduce the generation of bubbles.

[0014] 2. The pitch of the inlet spiral fins arranged on the surface of the inlet section screw rod is larger than the pitch of the melting spiral fins of the melting section screw rod, and then the pitch returns to be the same as the pitch of the inlet spiral fins on the inlet section screw rod on the outlet spiral fins of the outlet section screw rod. The change in the thread of the material passing through the inlet-melting connection section provides sufficient initial pressure to stably transport the material, and the change in the pitch between the melting section screw rod and the outlet section screw rod reduces the shear stress and reduces the problem of material deformation caused by factors such as friction and slow cooling.

[0015] 3. The inlet section screw rod and the melting section screw rod are connected by threads, and the melting section screw rod and the outlet section screw rod are also connected by threads. And bolt holes are arranged at the connection positions of the inlet section screw rod and the melting section screw rod and between the melting section screw rod and the outlet section screw rod. By using the cooperation between the bolt holes and the connecting bolts, the docking installation of the screw rods can be carried out. The two docking methods make the connection method more diversified, with better stability and easy disassembly. It can be replaced with double-threaded and conical-structured screw rods according to production, and replaced with other specification components according to the production requirements of special plastics, greatly improving the production efficiency and at the same time increasing the versatility of the extrusion screw rod. Description of the Drawings

[0016] Figure 1It is a schematic structural diagram of a screw for a special plastic extruder for material homogenization.

[0017] Figure 2 It is a schematic structural diagram of the connection structure of the screw in the inlet section, the melting section and the outlet section of the screw for a special plastic extruder for material homogenization.

[0018] Figure 3 It is a schematic structural diagram of the homogenization sieve plate in the screw for a special plastic extruder for material homogenization.

[0019] Figure 4 It is a schematic cross-sectional diagram of the homogenization sieve plate in the screw for a special plastic extruder for material homogenization.

[0020] Figure 5 It is a schematic structural diagram of the cross-sections of the screw in the inlet section, the melting section and the outlet section of the screw for a special plastic extruder for material homogenization.

[0021] Figure 6 It is a schematic structural diagram of the state of the twin-screw in the screw for a special plastic extruder for material homogenization.

[0022] In the figure: 1. Connecting shaft head; 2. Screw in the inlet section; 3. Homogenization sieve plate; 31. Discharge hole; 4. Inlet spiral piece; 5. Screw in the melting section; 51. Bolt hole; 52. Connecting bolt; 53. Docking hole; 6. Melting section spiral piece; 7. Screw in the outlet section; 71. Docking threaded rod; 8. Outlet section spiral piece. Specific embodiments

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

[0024] Please refer to Figures 1 to 6 , the embodiments of the present invention provide a screw for a special plastic extruder for material homogenization, including: a screw 2 in the inlet section, a homogenization sieve plate 3 is installed at the left end of the screw 2 in the inlet section, discharge holes 31 are arranged on the surrounding wall edge of the homogenization sieve plate 3, the right end of the screw 2 in the inlet section is connected to a screw 5 in the melting section, and the right end of the screw 5 in the melting section is connected to a screw 7 in the outlet section. The discharge holes 31 are distributed in a ring around the center of the homogenization sieve plate 3, and the diameter of the discharge holes 31 gradually becomes thinner from the inlet to the outlet;

[0025] Specifically, through the design of the gradually narrowing discharge hole 31, the discharge hole 31 is used to improve the homogenization of the material. At the same time, a gradually changing inlet design is adopted for the aperture of the discharge hole 31, so that large particles and small particles are gradually melted along the initial direction, and finally a melting effect can be obtained. This operation can not only achieve the melting effect in the initial stage, but also reduce the generation of bubbles, provide sufficient initial pressure, and stably transport the material, making it easier for the material to be stably homogenized.

[0026] An inlet spiral blade 4 is fixedly arranged on the surface of the inlet section screw rod 2, a melting section spiral blade 6 is fixedly arranged on the surface of the melting section screw rod 5, an outlet section spiral blade 8 is fixedly arranged on the surface of the outlet section screw rod 7. Docking holes 53 are arranged at both ends of the melting section screw rod 5. Docking threaded rods 71 are integrally connected to the ends of the inlet section screw rod 2 and the outlet section screw rod 7. The pitch of the inlet spiral blade 4 gradually becomes smaller to the pitch of the melting section spiral blade 6, and the pitch of the melting section spiral blade 6 gradually becomes larger to the pitch of the outlet section spiral blade 8. One side of the homogenizing sieve plate 3 is connected with a connecting shaft head 1. The inlet section screw rod 2, the melting section screw rod 5 and the outlet section screw rod 7 are all located on the same straight line. The inlet section screw rod 2 is threadedly connected to the melting section screw rod 5, and the melting section screw rod 5 is threadedly connected to the outlet section screw rod 7. The docking threaded rod 71 and the docking hole 53 cooperate with each other to form a threaded connection;

[0027] Bolt holes 51 are arranged at both ends of the melting section screw rod 5, and connecting bolts 52 for fastening are arranged inside the bolt holes 51;

[0028] Specifically, docking threaded rods 71 are connected to both the inlet section screw rod 2 and the outlet section screw rod 7. By using the threaded connection structure between the docking threaded rod 71 and the docking hole 53, an embedded connection is adopted between the inlet section and the melting section. The inlet section screw rod 2 and the outlet section screw rod 7 are respectively connected to both ends of the melting section screw rod 5. The inlet section screw rod 2 corresponds to the inlet section for feeding, and the outlet section screw rod 7 corresponds to the material outlet section. The threaded connection is convenient for disassembly and replacement, and other components of different specifications can be replaced, with better versatility. At the same time, with the bolt holes 51 and the connecting bolts 52 provided, the assembly connection between the inlet section screw rod 2, the outlet section screw rod 7 and the melting section screw rod 5 can be completed.

[0029] Working principle: When using the present utility model, the present utility model can meet the applications of single-screw and double-screw. The material is fed through the inlet section. Utilizing the characteristics of powder granulation, a screen-type gradually changing inlet design is adopted in the feeding part. Through the design of the discharge holes 31 on the surface of the homogenizing screen plate 3, large particles and small particles are gradually melted along the initial direction. The material will enter the inlet section screw 2. The pitch and groove depth of the inlet section helical fins and the melting section helical fins 6 decrease. The change in the thread of the material passing through the inlet section - melting section provides sufficient initial pressure to stably transport the material. The pitch of the melting section helical fins 6 decreases, so that the material receives sufficient stress here to improve the melting degree. The bottom diameter of the threads of the melting section screw 5 and the outlet section screw 7 gradually increases along the direction of material travel until the outlet section screw 7. The pitch of the melting section screw 5 to the pitch and groove depth of the outlet section screw 7 increase, reducing the stress on the material here, so that the material is evenly extruded from here. According to the production requirements of special plastics, the screws are replaced with different specifications. Using the threaded connection structure between the docking threaded rod 71 and the docking hole 53, other components of different specifications are respectively connected to both ends of the melting section screw 5, and in cooperation with the bolt holes 51 and the connecting bolts 52, the replacement of the components is completed.

[0030] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A special plastic extruder screw for material homogenization, characterized in that: include: An inlet section screw (2), a homogenizing sieve plate (3) for homogenizing materials is installed at the left end of the inlet section screw (2), a discharge hole (31) for homogenizing materials is arranged around the wall of the homogenizing sieve plate (3), the discharge holes (31) are distributed in a ring shape around the center of the homogenizing sieve plate (3), and the diameter of the discharge holes (31) gradually decreases from the inlet to the outlet, the right end of the inlet section screw (2) is connected to the melting section screw (5), and the right end of the melting section screw (5) is connected to the outlet section screw (7), the inlet section screw (2) is connected to the melting section screw (5), and the outlet section screw (7) is connected to the melting section screw (5). An inlet spiral sheet (4) is fixedly provided on the surface of the inlet section screw (2), a melting section spiral sheet (6) is fixedly provided on the surface of the melting section screw (5), and an outlet section spiral sheet (8) is fixedly provided on the surface of the outlet section screw (7); the inlet section screw (2) and the melting section screw (5) are threadedly connected, and the melting section screw (5) and the outlet section screw (7) are threadedly connected; the inlet section screw (2), the melting section screw (5) and the outlet section screw (7) are all located on the same straight line.

2. The special plastic extruder screw for material homogenization according to claim 1, characterized in that: The pitch of the inlet spiral sheet (4) gradually decreases to the pitch of the melting section spiral sheet (6), and the pitch of the melting section spiral sheet (6) gradually increases to the pitch of the outlet section spiral sheet (8).

3. The special plastic extruder screw for material homogenization according to claim 1, characterized in that: One side of the homogenizing screen plate (3) is connected to a connecting shaft head (1).

4. The special plastic extruder screw for material homogenization according to claim 1, characterized in that: The two ends of the melting section screw (5) are provided with docking holes (53); the connection ends of the inlet section screw (2) and the outlet section screw (7) with the melting section screw (5) are integrally connected with docking threaded rods (71); the docking threaded rods (71) and the docking holes (53) cooperate with each other to form a threaded connection.

5. The special plastic extruder screw for material homogenization according to claim 1, characterized in that: Bolt holes (51) are provided at both ends of the melting section screw (5), and connecting bolts (52) for tightening are provided inside the screw holes (51).

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