Double-gradual-change single-screw extruder

Abstract

The utility model discloses a double-gradual-change single-screw extruder, which comprises a granulator, a screw sleeve and a double-gradual-change screw arranged in the screw sleeve, an end cover and a driving piece are respectively arranged at the discharge end and the feed end of the screw sleeve, and a feed port and a water outlet are respectively arranged on the upper side and the lower side of the screw sleeve; the pitch of the double-gradual-change screw rod is gradually reduced from the feeding end to the discharging end in the screw rod sleeve, the pitch diameter of the double-gradual-change screw rod is also gradually reduced from the feeding end to the discharging end, a conical screw rod with equal-strength stress is formed, and a spiral cavity is formed between the conical screw rod and the conical cavity; the driving piece is used for driving the double-gradual-change screw rod to rotate; the end cover is provided with a discharge hole; and the granulator is placed in front of the discharge hole. According to the utility model, new equipment technical conditions are created for the processing technology and the quality improvement of high-end fluorosilicone polymer materials, the optimization of dehydration, extrusion and pelletizing technologies is facilitated, and the improvement of the product quality and the production efficiency is facilitated.

Description

Technical Field

[0001] The utility model relates to a double-gradual single-screw extruder, belonging to the technical field of rubber and plastic machinery. Background Art

[0002] Among traditional rubber and plastic machinery, there are single-screw extruders, twin-screw extruders, segmented variable-screw extruders, etc., which are all mechanical products with complete specifications and very mature production and application. However, for resins with poor heat sensitivity, high Shore hardness, and particularly difficult extrusion, especially fluorine / silicon polymer materials with very high cleanliness requirements, traditional screw machines have certain difficulties and it is difficult to guarantee quality requirements.

[0003] Single-screw extruders have poor mixing properties, poor stability in equal-diameter cantilever operation, and low extrusion pressure ratio, making them suitable for general low-melting plastics.

[0004] The twin-screw extruder has good mixing performance, but the kneading force is large. The equal-diameter screws also have poor stability, are prone to shell abrasion, and metal impurities are easily introduced into the product.

[0005] The segmented variable section single / double screw mill has good mixing performance, but the section is not continuous and the section cannot be too large, otherwise it will easily block the material. Utility Model Content

[0006] The purpose of the utility model is to provide a double-gradient single-screw extruder to solve the problems existing in the prior art.

[0007] The utility model provides a technical solution to solve the above technical problems: a double-gradient single-screw extruder, comprising a pelletizer, a screw sleeve with a conical cavity and a double-gradient screw installed in the screw sleeve, wherein the discharge end and the feed end of the screw sleeve are respectively provided with an end cover and a driving member, and the upper and lower sides are respectively provided with a feed port and a water outlet;

[0008] The pitch of the double tapered screw gradually decreases from the feed end to the discharge end in the screw sleeve, and the pitch diameter of the double tapered screw also gradually decreases from the feed end to the discharge end, forming a conical screw with equal strength. The spiral cavity formed between the conical screw and the conical cavity has a cross-sectional area that gradually decreases from the feed end to the discharge end. When the screw rotates, it pushes the material in the spiral cavity toward the discharge end, and is gradually compressed and moisture is removed during the process. When the material is compressed to the point where it can no longer be compressed, it is forced to be squeezed out from the discharge end.

[0009] The driving member is used to drive the double-gradient screw to rotate; the end cover is provided with a discharge port; and the pelletizer is placed in front of the discharge port.

[0010] A further technical solution is that a non-metallic lining is provided on the inner wall of the screw sleeve, and the inner cavity of the non-metallic lining is a conical cavity.

[0011] Further technical solutions are that the double fulcrum bearing box is provided between the screw sleeve and the driving part, and a communication shaft is arranged in the double fulcrum bearing box, and the communication shaft is connected with the double variable screw and the driving part at two ends respectively.

[0012] Further technical solutions are that the double variable single screw extruder further comprises a rack, and the screw sleeve, the double fulcrum bearing box and the driving part are all mounted on the rack.

[0013] Further technical solutions are that the end cover is provided with an electric heating element.

[0014] Further technical solutions are that the screw sleeve is provided with a feeding funnel communicated with the feeding port.

[0015] Further technical solutions are that the driving part is a gear reducer.

[0016] The utility model has the following beneficial effects: the utility model creates new equipment technical conditions for the processing technology and quality improvement of high-end fluorine silicon high molecular material, is favorable to the optimization of mixing process, and is favorable to the improvement of product production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the utility model double variable single screw.

[0018] Figure 2 It is a structure schematic view of the utility model.

[0019] As shown in the figure: 1-gear reducer power head, 2-double fulcrum bearing box, 3-feeding funnel, 4-nonmetallic lining, 5-double variable screw, 6-screw sleeve, 7-electric heating element, 8-end cover, 9-dicing machine, 10-rack. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, and obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0021] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the device or element must have a specific orientation, a specific orientation and operation, therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the utility model, it needs to explain, unless otherwise expressly provided and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0024] As Figure 1 and 2 The utility model provides a double gradient single screw extruder, including a granulator 9, a screw sleeve 6 and a double gradient screw 5 installed in the screw sleeve 6, wherein the double gradient screw 5 is a cylindrical screw, the pitch and the pitch diameter on the screw gradually change, and the specific as Figure 1 The pitch of the screw gradually decreases from the feeding end to the discharging end, and the pitch diameter of the screw gradually decreases from the feeding end to the discharging end, forming an equal strength stress conical screw, and the spiral cavity formed between the conical screw and the conical cavity, the cutting area of the spiral cavity, gradually decreases from the feeding end to the discharging end, when the screw rotates, the material (containing water) in the spiral cavity is pushed to the discharging end, is gradually compressed in the process, and the water is removed, when compressed to the point of compression, is forced to extrude from the discharging end, that is, the purpose of dehydration and drying is achieved.

[0025] The inner cavity of the screw sleeve 6 is a conical cavity, the conical cavity cooperates with the outer surface of the double gradient screw 5, and the left and right ends of the discharging end and the feeding end are respectively provided with end covers 8 and driving members 1, and the upper and lower sides are respectively provided with a feeding port and a water outlet in communication with the feeding end; The end cover 8 has a conical cavity in communication with the discharge port, and the left end of the double gradient screw 5 is provided with a conical body in the end cover 8 for material centering extrusion.

[0026] The driving member is used to drive the double-gradient screw 5 to rotate; the end cover 8 is provided with a discharge port; the pelletizer 9 is placed in front of the discharge port and is used to cut the compressed and discharged material.

[0027] The working process of the present invention is as follows: the water-containing raw resin enters the double-gradient spiral cavity of the screw sleeve 6 through the feed port for continuous compression, the surface water of the water-containing resin is continuously squeezed out and discharged from the water outlet, the compressed resin is formed and extruded from the end cover 8, and is pelletized by the pelletizer 9 into qualified finished products.

[0028] like Figure 2 As shown, in this embodiment, a non-metallic lining 4 is provided on the inner wall of the screw sleeve 6. The inner cavity of the non-metallic lining 4 is a conical cavity. The non-metallic lining 4 is made of a high-strength non-metallic material (such as PTFE, PEEK, etc.), which enhances the wear and corrosion resistance of the screw. During the resin extrusion process, the non-metallic lining 4 reduces wear on the twin-step screw and reduces contamination of the material. It also serves to position the screw axially and radially, enhancing the stability of the screw operation.

[0029] like Figure 2 As shown, in this embodiment, a preferred embodiment of this embodiment is that a double-pivot bearing box 2 is provided between the screw sleeve 6 and the driving member 1, and a connecting shaft is provided in the double-pivot bearing box 2, and the two ends of the connecting shaft are respectively connected to the double-gradient screw 5 and the driving member 1. In this way, the double-gradient screw 5, the connecting shaft, and the driving member 1 form a three-box coaxial transmission.

[0030] like Figure 2 As shown, in this embodiment, in order to facilitate the movement of various components, a preferred embodiment is that the twin-gradient single-screw extruder further includes a frame 10, and the screw sleeve 6, the double-pivot bearing box 2, and the driving member 1 are all mounted on the frame 10. In this way, most of the devices of the device are mounted on the frame 10, and when moving, only the frame 10 needs to be moved.

[0031] like Figure 2 As shown, in this embodiment, in order to facilitate heating of the material, it is preferred that an electric heating element 7 is provided on the end cover 8 .

[0032] like Figure 2 As shown, in this embodiment, in order to facilitate loading, a preferred implementation is that a feeding funnel 3 connected to a feeding port is provided on the screw sleeve 6.

[0033] In this embodiment, a specific implementation of the driving member 1 is that the driving member 1 is a gear reducer. The gear reducer is connected to the double-gradient screw 5 through a connecting shaft, thereby driving the double-gradient screw 5 to rotate in the screw sleeve 6.

[0034] The above description does not limit the present invention in any form. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can use the technical content disclosed above to make some changes or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Double-gradient single-screw extruder, characterized in that, The invention comprises a pelletizer (9), a screw sleeve (6) having a conical cavity, and a double-gradient screw (5) installed in the screw sleeve (6), wherein the discharge end and the feed end of the screw sleeve (6) are respectively provided with an end cover (8) and a driving member (1), and the upper and lower sides are respectively provided with a feed port and a water outlet; The pitch of the double-gradient screw (5) gradually decreases from the feed end to the discharge end in the screw sleeve (6), and the pitch diameter of the double-gradient screw (5) also gradually decreases from the feed end to the discharge end, forming a conical screw with equal strength stress. The spiral cavity formed between the conical screw and the conical cavity, and the cross-sectional area of ​​the spiral cavity also gradually decrease from the feed end to the discharge end. When the screw rotates, it pushes the material in the spiral cavity forward toward the discharge end, and is gradually compressed during the forward movement, and moisture is removed. When the material is compressed to the point where it can no longer be compressed, it is forced to be extruded from the discharge end. The driving member is used to drive the double-gradient screw (5) to rotate; the end cover (8) is provided with a discharge port; and the pelletizer (9) is placed in front of the discharge port.

2. The double-gradient single-screw extruder according to claim 1, characterized in that A non-metallic lining (4) is provided on the inner wall of the screw sleeve (6), and the inner cavity of the non-metallic lining (4) is a conical cavity.

3. The double-gradient single-screw extruder according to claim 1, characterized in that: A double-pivot bearing box (2) is provided between the screw sleeve (6) and the driving member (1), and a connecting shaft is provided in the double-pivot bearing box (2). Both ends of the connecting shaft are respectively connected to the double-gradient screw (5) and the driving member (1).

4. The double-gradient single-screw extruder according to claim 3, characterized in that: The double-gradient single-screw extruder also includes a frame (10), and the screw sleeve (6), the double-pivot bearing box (2), and the driving member (1) are all mounted on the frame (10).

5. The double-gradient single-screw extruder according to claim 1, characterized in that: The end cover (8) is provided with an electric heating element (7).

6. The double-gradient single-screw extruder according to claim 1, characterized in that: The screw sleeve (6) is provided with a feeding funnel (3) which is in communication with the feeding port.

7. The double-gradient single-screw extruder according to claim 1, characterized in that: The driving member (1) is a gear reducer.

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