Wear-resistant twin-screw

Abstract

The utility model discloses a wear-resistant twin screw which comprises a screw body, a first screw flight, a second screw flight, a third screw flight and a fourth screw flight are arranged on the screw body, the second screw flight is located between the first screw flight and the third screw flight, and the height of the top face of the second screw flight is smaller than that of the top face of the first screw flight and that of the top face of the third screw flight. And the surface of the screw body is coated with a wear-resistant layer. When the double-screw is used, the double-screw is mounted at a material extruding position of an extruder for use, materials are stirred between the two screws when the two screw bodies rotate at the same time, and the materials are extruded by the double screws through the first screw flight to be crushed, stirred by the first screw flight and the second screw flight and then conveyed to the third screw flight and the fourth screw flight, so that the materials are uniformly extruded and crushed. The materials are extruded for four times and are finally extruded and discharged, so that the crushed materials are finely extruded again; and through the arrangement of the wear-resistant layer and the reinforcing ribs, the service life of the screw body can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rods, in particular to a wear-resistant twin-screw rod. Background Art

[0002] The function of the screw is to gradually transform the rubber material into linear motion as the screw rotates, pushing it toward the die head. It then cooperates with the die body to compress, generate heat, soften, stir, and mix the rubber material. The screw is a key component of the injection molding machine, conveying, compacting, melting, stirring, and pressurizing the plastic, all of which is accomplished by the screw's rotation within the barrel. When the screw is in use, the threads of the screw head are often given different helical shapes to facilitate the extrusion and feeding of the material.

[0003] However, the corrosion resistance and wear resistance of the traditional twin-screw are not very high after long-term use. In addition, during the extrusion process, the material will rub and wear against the screw surface, causing the gap between the screw and the barrel to increase, resulting in insufficient extrusion of the material and affecting the extrusion quality. Utility Model Content

[0004] The main purpose of the utility model is to provide a wear-resistant twin-screw rod to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a wear-resistant twin-screw, comprising a screw body, on which a first screw ridge, a second screw ridge, a third screw ridge and a fourth screw ridge are provided, the second screw ridge is located between the first screw ridge and the third screw ridge, and the top surface height of the second screw ridge is less than the top surface height of the first screw ridge and the third screw ridge; the surface of the screw body is coated with a wear-resistant layer.

[0006] On the basis of the above solution and as a preferred solution of the above solution: a sealing ring is provided at one end of the screw body.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the depth between the outer surface of the second screw flight and the screw body is smaller, and the depth between the outer surfaces of the first and third screw flights and the screw body is greater than the depth between the outer surface of the second screw flight and the screw body.

[0008] On the basis of the above solution and as a preferred solution of the above solution: a cross reinforcement rib is provided in the screw body.

[0009] On the basis of the above solution and as a preferred solution of the above solution: the wear-resistant layer is a chrome-plated film.

[0010] On the basis of the above solution and as a preferred solution of the above solution: the outer surface of the screw is nitrided, the hardness HV>950, and the depth of the nitrided layer is 0.8mm.

[0011] The beneficial effects of the utility model are as follows: when the twin-screw of the utility model is in use, it is installed at the extrusion place of the extruder for use. When the two screw bodies rotate at the same time, the material is stirred between the two screws. The material first passes through the first screw ridge and is squeezed by the twin rods, so that the material is first crushed. Then, after being stirred by the first and second screw ridges, the material is transported to the third and fourth screw ridges. After four extrusions, the material is finally extruded out, so that the crushed material can be finely squeezed again. By setting the wear-resistant layer and the reinforcing ribs, the practical life of the screw body can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a side view of the present utility model. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments. However, the specific implementation methods and embodiments described below are only for illustrative purposes and are not intended to limit the present invention.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0017] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0018] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0019] See attached figure Figures 1 to 2 In this embodiment, a wear-resistant twin-screw includes a screw body 1, on which a first screw wing 2, a second screw wing 3, a third screw wing 4 and a fourth screw wing 5 are provided. The second screw wing 3 is located between the first screw wing 2 and the third screw wing 4, and the top surface height of the second screw wing 3 is less than the top surface height of the first screw wing 2 and the third screw wing 4; the surface of the screw body 1 is coated with a wear-resistant layer 7.

[0020] Furthermore, a sealing ring 6 is provided at one end of the screw body 1 to prevent material from overflowing.

[0021] Furthermore, the depth between the outer surface of the second screw flight 3 and the screw body 1 is smaller, and the depth between the outer surfaces of the first and third screw flights 2 , 4 and the screw body 1 is greater than the depth between the outer surface of the second screw flight 3 and the screw body 1 .

[0022] Furthermore, a cross reinforcement rib 8 is provided in the screw body 1 .

[0023] Furthermore, the wear-resistant layer 7 is a chrome-plated film.

[0024] Furthermore, the outer surface of the screw is nitrided, with a hardness of HV>950 and a nitrided layer depth of 0.8 mm.

[0025] Working principle: When in use, it is installed at the extrusion place of the extruder. The two screw bodies 1 rotate at the same time, and the material is stirred between the two screw bodies 1. The material first passes through the first screw ridge 2 and is squeezed by the double rods to crush the material. Then it is stirred by the second screw ridge 3 and then transported to the third screw ridge 4 and the fourth screw ridge 5. After four extrusions, the material is finally extruded and the crushed material is re-extruded. The setting of the wear-resistant layer 7 and the reinforcement rib 8 can extend the practical life of the screw body.

[0026] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wear-resistant twin-screw, characterized in that: It includes a screw body, on which a first screw ridge, a second screw ridge, a third screw ridge and a fourth screw ridge are provided, the second screw ridge is located between the first screw ridge and the third screw ridge, and the top surface height of the second screw ridge is less than the top surface height of the first screw ridge and the third screw ridge; the surface of the screw body is coated with a wear-resistant layer; a sealing ring is provided at one end of the screw body; the depth between the outer surface of the second screw ridge and the screw body is smaller, and the depth between the outer surfaces of the first and third screw ridges and the screw body is greater than the depth between the outer surface of the second screw ridge and the screw body.

2. The wear-resistant twin-screw according to claim 1, characterized in that: A cross reinforcement rib is provided in the screw body.

3. The wear-resistant twin-screw according to claim 2, characterized in that: The wear-resistant layer is a chrome-plated film.

4. The wear-resistant twin-screw according to claim 3, characterized in that: The outer surface of the screw is nitrided, with a hardness of HV>950 and a nitriding layer depth of 0.8mm.

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