A low smoke halogen-free screw

Abstract

The utility model discloses a low-smoke and halogen-free screw, comprising a screw body and a head coaxially arranged with the screw body, the head being conical, a base being arranged at one end of the screw body away from the head, the base comprising a threaded portion fixedly connected with the screw body and a fixed portion arranged at the other end of the threaded portion, a screw ridge protrusion being obliquely arranged around the cylindrical surface of the screw body, one end of the screw ridge protrusion being connected with the head, and the other end of the screw ridge protrusion being connected with the threaded portion, when the rubber material flows along a melt channel formed by the cooperation of the head and a flange glue inlet hole, the angle of the channel entrance is changed by the conical head, thereby controlling the flow rate at the glue inlet, shortening the time of the rubber material in the melt channel, avoiding the foaming of the material, and improving the product quality, and by obliquely arranging the screw ridge protrusion on the cylindrical surface of the screw body, the thrust of the screw body on the rubber melt is increased, thereby improving the extrusion efficiency, and the utility model belongs to the technical field of screw processing.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw processing, and more specifically relates to a low-smoke and halogen-free screw. Background Art

[0002] As the heart of the extruder, the screw has a very important impact on the quality and output of the extruder products. The main functions of a screw are to transport materials, transfer heat to plasticize materials, and mix and homogenize materials.

[0003] Since a large amount of flame retardants are added to low-smoke halogen-free materials, the viscosity of the rubber melt is high and the fluidity is poor. It is easily subjected to high shear force, resulting in self-heating, which makes the process temperature difficult to control and the extrusion efficiency is very low.

[0004] In order to reduce the pressure at the machine neck, a filter ring is used instead of a filter plate when extruding low-smoke halogen-free materials. This causes the end of the screw to be relatively long from the flow channel of the die head glue inlet. The rubber stays in the melt channel for too long, which is not conducive to the discharge of the rubber melt gas in the screw, easily causing the material to foam and affecting the quality of the final product. Summary of the Invention

[0005] The main purpose of the utility model is to provide a low-smoke halogen-free screw, which can improve extrusion efficiency and product quality.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0007] A low-smoke, halogen-free screw comprises a screw body and a head coaxially arranged with the screw body, the head being fixedly connected to one end of the screw body, the head being conical, and the end of the screw body away from the head being provided with a base for convenient installation, the base comprising a threaded portion fixedly connected to the screw body and a fixed portion arranged at the other end of the threaded portion, a screw ridge protrusion being obliquely arranged around the cylindrical surface of the screw body, one end of the screw ridge protrusion being connected to the head, and the other end of the screw ridge protrusion being connected to the threaded portion.

[0008] In a specific embodiment of the present invention, the taper angle of the nose is in the range of 55° to 65°.

[0009] In a specific embodiment of the present invention, the head is made of alloy steel, and a hard chromium layer is provided on the surface of the head.

[0010] In a specific embodiment of the present invention, the screw ridge protrusion is a right-angled trapezoid, and the angle between the screw ridge protrusion and the screw body is in the range of 15° to 20°.

[0011] In a specific embodiment of the present invention, a convoluted recess is further provided at the connection between the screw body and the threaded portion.

[0012] In a specific embodiment of the present invention, the screw body is made of alloy steel, and a hard chromium layer is provided on the surface of the screw body.

[0013] In a specific embodiment of the present invention, a buffer portion is provided between the threaded portion and the fixing portion, and the buffer portion, the threaded portion, and the fixing portion are all coaxially arranged.

[0014] In a specific embodiment of the present invention, a plurality of threaded holes are provided at intervals on the cylindrical surface of the fixing portion, and the plurality of threaded holes are respectively arranged along the axial direction of the fixing portion.

[0015] In a specific embodiment of the present invention, the diameter of the fixing portion is smaller than that of the threaded portion, and the diameter of the buffer portion is the same as that of the threaded portion.

[0016] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0017] The utility model provides a conical head and a base for easy installation at both ends of the screw body. When the rubber material flows along the melt channel formed by the cooperation of the head and the flange glue inlet hole, the angle of the channel entrance is changed by the conical head, thereby controlling the flow rate at the glue inlet, shortening the time the rubber material stays in the melt channel, avoiding the foaming of the material, and improving the product quality; and by arranging the screw ridge protrusion on the cylindrical surface of the screw body at an angle, the thrust of the screw body on the rubber material melt is further increased, the shear force and friction force of the melt are controlled, and the extrusion efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is an overall structural diagram of an embodiment of the utility model;

[0020] Figure 2 This is a BB direction cross-sectional view of an embodiment of the utility model;

[0021] Figure 3 This is a cross-sectional view of point A of an embodiment of the present utility model;

[0022] Figure 4 It is a K-direction view of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, 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. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0028] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0029] Reference Figures 1 to 4 As shown, a low-smoke zero-halogen screw includes a screw body 1, a head 2 and a base 3, wherein the head 2 and the screw body 1 are coaxially arranged, the head 2 is conical, and the taper range of the head 2 is 55° to 65°, preferably 60°.

[0030] By designing the machine head 2 to be at the same angle as the flange glue inlet angle, the partial dimensions can be matched with the flange glue inlet hole to form a melt channel, so that the glue material flows along the set flow channel to ensure uniform pressure, thereby reducing the flow rate at the flange glue inlet and shortening the time the glue material stays in the melt channel, thereby shortening the time the glue material stays in the machine head, avoiding material foaming, and improving the quality of the final product.

[0031] In one embodiment of the present invention, the head 2 is an alloy steel component, preferably 38CrMoAl alloy steel, and a hard chromium layer is provided on the surface of the head 2 to improve its wear resistance and hardness.

[0032] In one embodiment of the present invention, the head 2 is fixedly connected to one end of the screw body 1, and the end of the screw body 1 away from the head 2 is provided with a base 3 for easy installation. The base 3 includes a threaded portion 31 fixedly connected to the screw body 1 and a fixed portion 32 arranged at the other end of the threaded portion 31. A spiral recess 5 is provided at the connection between the screw body 1 and the threaded portion 31, and the low-smoke halogen-free screw can be connected to an external drive device through the fixed portion 32.

[0033] In one embodiment of the present invention, a spiral ridge protrusion 4 is obliquely arranged around the cylindrical surface of the screw body 1, one end of the spiral ridge protrusion 4 is connected to the head 2, and the other end of the spiral ridge protrusion 4 is connected to the threaded portion 31 to ensure continuity during extrusion. The spiral ridge protrusion 4 is a right-angled trapezoid. By setting the angle between the spiral ridge protrusion 4 and the screw body 1 in the range of 15° to 20°, preferably 15°, the thrust of the screw body 1 on the rubber melt can be increased, and the melt shear force and friction can be reduced, thereby solving the problems of excessive current and excessive shear heat during extrusion.

[0034] In one embodiment of the present invention, a buffer portion 6 is provided between the threaded portion 31 and the fixed portion 32 to prevent over-tightening. The buffer portion 6, the threaded portion 31 and the fixed portion 32 are all coaxially arranged, and the diameter of the fixed portion 32 is smaller than that of the threaded portion 31. The buffer portion 6 and the threaded portion 31 have the same diameter. A boss for installation is also provided at the end of the fixed portion 32 away from the buffer portion 6.

[0035] In one embodiment of the present invention, four threaded holes 321 are spaced apart on the cylindrical surface of the fixing portion 32 . The four threaded holes 321 are arranged in pairs, and the four threaded holes 321 are respectively arranged along the axial direction of the fixing portion 32 .

[0036] In one embodiment of the present invention, the screw body 1 and the screw ridge protrusion 4 are both alloy steel components, preferably 38CrMoAl alloy steel, and a hard chromium layer is provided on the surface of the screw body 1 and the screw ridge protrusion 4. The wear resistance and hardness of the screw body 1 and the screw ridge protrusion 4 are improved by hard chromium plating.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low smoke zero halogen screw, characterized in that: The invention comprises a screw body (1) and a machine head (2) coaxially arranged with the screw body (1), wherein the machine head (2) is fixedly connected to one end of the screw body (1), the machine head (2) is conical, and a base (3) for convenient installation is provided at one end of the screw body (1) away from the machine head (2), the base (3) comprises a threaded portion (31) fixedly connected to the screw body (1) and a fixed portion (32) arranged at the other end of the threaded portion (31), and a screw ridge protrusion (4) is arranged obliquely around the cylindrical surface of the screw body (1), one end of the screw ridge protrusion (4) is connected to the machine head (2), and the other end of the screw ridge protrusion (4) is connected to the threaded portion (31).

2. The low-smoke zero-halogen screw according to claim 1, characterized in that: The taper of the nose (2) ranges from 55° to 65°.

3. The low-smoke zero-halogen screw according to claim 2, characterized in that: The machine head (2) is a component made of alloy steel material, and a hard chrome layer is provided on the surface of the machine head (2).

4. The low-smoke zero-halogen screw according to claim 1, characterized in that: The screw ridge protrusion (4) is a right-angled trapezoid, and the angle between the screw ridge protrusion (4) and the screw body (1) is in the range of 15° to 20°.

5. The low-smoke zero-halogen screw according to claim 1, characterized in that: A spiral concave portion (5) is also provided at the connection between the screw body (1) and the threaded portion (31).

6. The low-smoke zero-halogen screw according to claim 5, characterized in that: The screw body (1) is a component made of alloy steel material, and the surface of the screw body (1) is provided with a hard chrome layer.

7. The low-smoke zero-halogen screw according to claim 1, characterized in that: A buffer portion (6) is provided between the threaded portion (31) and the fixing portion (32), and the buffer portion (6), the threaded portion (31) and the fixing portion (32) are all coaxially arranged.

8. The low-smoke zero-halogen screw according to claim 7, characterized in that: A plurality of threaded holes (321) are arranged at intervals on the cylindrical surface of the fixing portion (32), and the plurality of threaded holes (321) are respectively arranged along the axial direction of the fixing portion (32).

9. The low-smoke zero-halogen screw according to claim 7, characterized in that: The diameter of the fixing portion (32) is smaller than that of the threaded portion (31), and the diameter of the buffer portion (6) is the same as that of the threaded portion (31).

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