Pressure-resistant high plasticizing double-alloy barrel screw

Abstract

The utility model relates to the field of machine cylinder screw rod, concretely points to a kind of pressure-resistant high plasticization double-alloy machine cylinder screw rod, including the screw rod part consisting of supporting shaft, conical cylinder and variable pitch spiral fan plate, and the machine cylinder with arc-shaped bin in end portion etc. Compared with prior art, the screw rod in the extruder cylinder is provided, the cross-sectional area of the supporting rod part is continuously increased, and the distance between adjacent plates on the spiral fan plate is continuously reduced, so that the space of each transmission unit formed between the machine cylinder and the screw rod is gradually reduced, the internal compactness of the liquid material in the space is enhanced, the gas contained therein is extruded out, the existence of bubbles in the material is greatly reduced, and the quality of the plasticized product is improved.

Description

Technical Field

[0001] This utility model relates to the field of barrel screws, specifically to a pressure-resistant, highly plasticized bialloy barrel screw. Background Technology

[0002] The extruder uses a screw rotating inside the barrel to fully plasticize and mix the material, and finally discharge it as a mold.

[0003] During the process of liquid material being fed into the barrel and conveyed by the screw, some air bubbles are carried in. In the relatively closed environment of the barrel, the air bubbles are not easily discharged to the outside and mix with the material. They are discharged together and shaped into relevant shapes, resulting in the internal structure of the produced parts being not dense and uniform, leading to substandard quality. To address this, a pressure-resistant, high-plasticity bi-alloy barrel screw is provided. Utility Model Content

[0004] I. Technical problems to be solved

[0005] The technical problem this invention aims to solve is that air bubbles are easily mixed into the liquid material conveyed by the screw in an extruder, and are not easily discharged, ultimately resulting in substandard product quality.

[0006] II. Technical Solution

[0007] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a pressure-resistant, high-plasticity bialloy barrel screw, including a screw and a barrel installed around the screw and used in conjunction with the screw to convey materials.

[0008] A support is installed below the barrel, and a feed inlet is connected to one side of the top of the barrel. A discharge outlet is connected to the end of the barrel away from the feed inlet.

[0009] The screw includes a support shaft rotatably mounted at the center of the barrel. A drive motor that drives and cooperates with the support shaft is mounted on the bracket. A tapered cylinder is connected to the outside of the support shaft. A continuously extending spiral fan plate is connected to the outside of the tapered cylinder. There is a small gap between the edge of the spiral fan plate and the inner wall of the barrel.

[0010] As the conical cylinder extends from the end furthest from the discharge port toward the end closest to the discharge port, its cross-sectional area gradually increases, and the distance between adjacent spiral fan plates gradually decreases. By gradually reducing the spatial size of the conveying unit during the conveying process, the liquid material is squeezed, and the air bubbles it carries are expelled.

[0011] Furthermore, the conical cylinder has a hemispherical structure at the end near the discharge port, and an arc-shaped chamber that matches the spherical end of the conical cylinder is connected to the end of the cylinder near the discharge port.

[0012] Furthermore, a funnel is installed on the feed inlet to facilitate the addition of materials into the barrel.

[0013] Furthermore, the barrel is connected downward to a waste discharge pipe on the side of the feed inlet away from the discharge outlet, and a water pump is installed on the waste discharge pipe.

[0014] III. Beneficial Effects

[0015] The advantages of this invention compared to the prior art are as follows: the screw installed in the extruder barrel, through the continuous increase of the cross-sectional area of ​​the supporting rod and the continuous decrease of the distance between adjacent plates on the spiral fan plate, gradually reduces the space of each conveying unit formed between the barrel and the screw, enhances the compactness of the liquid material inside the space, squeezes out the gas it contains, thereby significantly reducing the presence of air bubbles in the material and improving the quality of the plasticized product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a pressure-resistant, high-plasticity bialloy barrel screw according to this utility model. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the external structure of a pressure-resistant, high-plasticity bialloy barrel screw according to this utility model. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the internal structure of a pressure-resistant, highly plasticized bialloy barrel screw according to this utility model.

[0019] Figure 4 This is a schematic diagram of the external structure of the screw body in a pressure-resistant, high-plasticity bialloy barrel screw according to this utility model.

[0020] Figure 5 yes Figure 3 A partial structural diagram.

[0021] Figure 6 yes Figure 3 A schematic diagram of the structure of part A.

[0022] As shown in the figure: 1. Support frame, 2. Cylinder, 3. Feed inlet, 4. Discharge outlet, 5. Arc-shaped hopper, 6. Support shaft, 7. Conical cylinder, 8. Spiral fan plate, 9. Drive motor, 10. Support plate, 11. Waste discharge pipe, 12. Water pump. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a pressure-resistant, high-plasticity bimetallic screw barrel, combined with an attached... Figure 3-4 The machine includes a screw, which includes a support shaft 6 rotatably mounted at the center of the machine barrel 2. A drive motor 9 that is mutually driven and cooperates with the support shaft 6 is mounted on the bracket 1. A conical cylinder 7 is connected to the outside of the support shaft 6. The end of the conical cylinder 7 near the discharge port 4 has a hemispherical structure. A continuously extending spiral fan plate 8 is connected to the outside of the conical cylinder 7. There is a small gap between the edge of the spiral fan plate 8 and the inner wall of the machine barrel 2.

[0025] As the conical cylinder 7 extends from the end away from the discharge port 4 towards the end closer to the discharge port 4, the cross-sectional area of ​​the conical cylinder 7 gradually increases, and the distance between two adjacent spiral fan plates 8 gradually decreases. By gradually reducing the spatial size of the conveying unit during the conveying process, the liquid material is squeezed and the air bubbles it carries are squeezed out.

[0026] The screw is conical in shape, with a support shaft 6 as the base and a conical cylinder 7 installed on the outside. The spiral fan plate 8, which transports materials by rotation, is set on the inclined surface of the conical cylinder 7. The area between two adjacent plates on the spiral fan plate 8 and the inner wall of the conical cylinder 7 and the barrel 2 serves as a conveying unit. As the spacing between the spiral fan plates 8 gradually decreases and the distance between the edge of the conical cylinder 7 and the inner wall of the barrel 2 becomes smaller, the space inside the conveying unit also gradually narrows. Under the same amount of material, the liquid material is gradually compressed and becomes denser, thereby squeezing out the air bubbles carried within it towards the larger conveying unit behind. Finally, the air bubbles reach the relatively spacious feed inlet 3, detach from the material, and are automatically discharged into the outside air.

[0027] The effective conveying of materials by the screw, as well as the separation effect of air bubbles in liquid materials given to the screw in this application, both require the cooperation of the barrel 2. Therefore, in the specification and drawings of this application, the barrel 2 that is matched with the screw structure has also been specified and designed accordingly.

[0028] Combined with appendix Figure 1-2 The machine barrel 2, installed around the screw and used in conjunction with the screw to convey materials, includes a support 1 mounted below the barrel 2. A feed inlet 3 is connected to the top side of the barrel 2, and a funnel for adding materials into the barrel 2 is installed on the feed inlet 3. A discharge outlet 4 is connected to the end of the barrel 2 furthest from the feed inlet 3. Figure 5 The end of the barrel 2 near the discharge port 4 is connected to an arc-shaped chamber 5 that matches the spherical end of the conical barrel 7;

[0029] As the cross-sectional area of ​​the conical cylinder 7 continuously increases at the end of the screw, there is a spatial drop between the material leaving the spiral fan plate 8 and reaching the discharge port 4. In a large space, the liquid material that is not enough to fill the space immediately is prone to re-mixing with gas as it falls downwards. Therefore, its end is set as an arc-shaped hemispherical structure, and the inner wall of the cylinder 2, which is designed to regulate the material conveying path, is also set in the same way to prevent the space in this area from suddenly becoming very large.

[0030] Combined with appendix Figure 6 The barrel 2 is located on the side of the feed inlet 3 away from the discharge outlet 4 and is connected downward to a waste discharge pipe 11. A water pump 12 is installed on the waste discharge pipe 11. In order to make the air bubbles in front move backward under the pressure of the material, a small gap is left between the spiral fan plate 8 and the barrel 2, which will not affect the material conveying behavior.

[0031] The presence of gaps will inevitably lead to trace amounts of liquid material remaining in the barrel 2. By installing a waste discharge pipe 11 with a water pump 12 at a suitable position in the barrel 2, the remaining material in the barrel 2 can be discharged and cleaned after the extruder has processed a batch of material.

[0032] In the specific implementation of this utility model, when the extruder equipped with the screw structure and device is conveying and molding the material, the liquid material is continuously poured in from the feed port 3 in a relatively slow manner. On the one hand, the relatively gentle feeding method can reduce the material's entrainment of air and reduce the generation of internal bubbles. On the other hand, it is also to reduce the bubbles squeezed out of the liquid material in the later stage and discharge them into the atmosphere.

[0033] The support shaft 6 containing the spiral fan plate 8 rotates slowly inside the barrel 2 under the transmission support of the drive motor 9, gradually squeezing the material fed into the feed port 3 toward the discharge port. The material is blocked to a certain extent by the end arc plate at the end of the barrel 2. After the material hits and is pressed against the inner wall of the arc chamber 5, the liquid is shaken and the small bubbles merge into large bubbles. Under the action of centrifugal force generated by the rotation of the spiral fan plate 8, they move toward the inner wall of the barrel 2 and do not reach the discharge port located at the center of the barrel 2, and are discharged together with the material.

[0034] As material is continuously added, the barrel 2 is filled with material. The material is continuously pushed forward by the spiral fan plate 8. In each step, the space gradually decreases and is forced to become denser. During this process, the air bubbles carried inside are slowly squeezed out. Due to the smaller space in front, it can only move backward and eventually reach the area below the feed inlet 3, where it rises and emits liquid material, which is then discharged into the air.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A pressure-resistant, high-plasticity bimetallic barrel screw, comprising a screw and a barrel (2) installed around the screw and used in conjunction with the screw to convey materials, characterized in that: A bracket (1) is installed below the barrel (2), and a feed inlet (3) is connected to the top side of the barrel (2) facing upwards. A discharge outlet (4) is connected to the end of the barrel (2) away from the feed inlet (3). The screw includes a support shaft (6) rotatably mounted at the center of the barrel (2), a drive motor (9) that is mutually driven and cooperates with the support shaft (6) is mounted on the bracket (1), a tapered cylinder (7) is connected to the outside of the support shaft (6), a continuously extending spiral fan plate (8) is connected to the outside of the tapered cylinder (7), and there is a small gap between the edge of the spiral fan plate (8) and the inner wall of the barrel (2); As the conical cylinder (7) extends from the end away from the discharge port (4) towards the end closer to the discharge port (4), the cross-sectional area of ​​the conical cylinder (7) gradually increases, and the distance between two adjacent spiral fan plates (8) gradually decreases. By gradually reducing the spatial size of the conveying unit during the conveying process, the liquid material is squeezed and the bubbles it carries are squeezed out.

2. The pressure-resistant, high-plasticity bimetallic barrel screw according to claim 1, characterized in that: The conical cylinder (7) has a hemispherical structure at the end near the discharge port (4), and the end of the machine barrel (2) near the discharge port (4) is connected to an arc-shaped chamber (5) that matches the spherical end of the conical cylinder (7).

3. The pressure-resistant, high-plasticity bimetallic barrel screw according to claim 1, characterized in that: A funnel is installed on the feed inlet (3) to facilitate adding materials into the barrel (2).

4. The pressure-resistant, high-plasticity bimetallic barrel screw according to claim 1, characterized in that: The barrel (2) is located on the side of the feed inlet (3) away from the discharge outlet (4) and is connected downward to a waste discharge pipe (11). A water pump (12) is installed on the waste discharge pipe (11).

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