Sectional type screw structure of screw extruder
By designing a segmented screw structure, the problems of poor mixing effect and inconvenient disassembly and assembly in existing screw extruders are solved, achieving more efficient material mixing and a simplified maintenance process, thereby improving product quality and performance.
Patent Information
- Application Number
- CN202520286036.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-21
AI Technical Summary
The screw structure of existing screw extruders results in poor raw material mixing, inconvenient disassembly and cleaning, and affects product quality and maintenance efficiency.
It adopts a segmented screw structure, including a conveying section, a mixing section and a metering section. The sections are connected by key drive and are equipped with sealing grooves and sealing rings. The mixing blades are designed as three-blade propellers, paddles or anchors, and the screw pitch is designed to improve the mixing effect.
It improves the uniformity of material mixing and conveying efficiency, enhances the quality and performance of extruded products, simplifies the disassembly and assembly process, and reduces maintenance difficulty.
Smart Images
Figure CN223790985U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a screw extruder, and more particularly to a segmented screw structure for a screw extruder. Background Technology
[0002] The existing process for preparing flame retardants involves reacting a compound (N) with a compound (P), adding an oxidant to the reaction product, and then reacting the mixture to obtain the flame retardant. In actual production, the raw materials need to be melted, mixed, and then extruded through a screw extruder. Finally, the mixture is cooled, granulated, and packaged. The screw of an existing screw extruder consists of a single rotating shaft and a single helical blade, resulting in poor mixing of the raw materials on the screw, affecting the quality and performance of the extruded product. Furthermore, it presents inconveniences in maintenance and cleaning, with cumbersome disassembly and assembly processes that consume significant time and manpower. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a segmented screw structure for a screw extruder that is reasonably designed, has a good mixing effect, and is easy to disassemble and assemble, in order to overcome the shortcomings of the existing technology.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A segmented screw structure for a screw extruder, characterized in that the screw comprises a conveying section, a mixing section, and a metering section; the conveying section includes a rotating shaft I and helical conveying blades mounted on the rotating shaft I; the mixing section includes a rotating shaft II inserted into the rotating shaft I and a plurality of mixing blades inserted on the rotating shaft II, the mixing blades being uniformly distributed along the circumference and axial direction of the rotating shaft II; the metering section includes a rotating shaft III inserted into the rotating shaft II and helical metering blades mounted on the rotating shaft III, the pitch of the helical metering blades being smaller than the pitch of the helical conveying blades; and the diameters of the rotating shafts I, II, and III are equal.
[0006] The technical problem to be solved by this utility model can also be achieved through the following technical solution: a shaft head is provided at the outer end of the rotating shaft I and the rotating shaft III; the inner end of the rotating shaft I and the rotating shaft II, and the inner end of the rotating shaft II and the rotating shaft III are connected by a key and a keyway; the key can be square, elliptical, or other irregular shapes other than circular.
[0007] The technical problem to be solved by this utility model can also be achieved by the following technical solution: sealing grooves are provided at the inner ends of the rotating shaft I and rotating shaft III and at both ends of the rotating shaft II, and sealing rings are installed in the sealing grooves to prevent materials from entering the key and keyway.
[0008] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the length of the mixing section is greater than the length of the conveying section, the length of the conveying section is greater than the length of the metering section, the length of the mixing section is extended, and the mixing effect is further improved. In order to ensure the mixing effect, the length of the mixing section can be set to 1-2 times that of the conveying section, the length of the conveying section can be set to 1-2 times that of the metering section, and finally, it is necessary to make corresponding adjustments according to the mixing effect.
[0009] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing blade is a three-bladed propulsion blade, a paddle blade, or an anchor blade.
[0010] Compared with existing technologies, this invention features a conveying section, a mixing section, and a metering section, all connected by a key drive for easy assembly and disassembly. The conveying section uses a large pitch screw to accelerate material transport and improve efficiency. The mixing blades enhance the mixing effect, resulting in more uniform material mixing. The metering section uses a small pitch screw to ensure stable extrusion. This segmented screw structure is rationally designed, easy to disassemble and install, effectively improving material transport and mixing, significantly enhancing the quality and performance of the extruded product, and simplifying maintenance. Attached Figure Description
[0011] Figure 1 This is a structural diagram of the segmented screw structure of the screw extruder described in this utility model.
[0012] In the diagram: 1-Rotating shaft I, 2-Screw conveyor blade, 3-Key, 4-Rotating shaft II, 5-Mixing blade, 6-Rotating shaft III, 7-Screw metering blade. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0014] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0015] Reference Figure 1A segmented screw structure for a screw extruder includes a conveying section, a mixing section, and a metering section. The conveying section includes a rotating shaft I1 and helical conveying blades 3 mounted on the rotating shaft I2. The mixing section includes a rotating shaft II4 inserted into the rotating shaft I1 and several mixing blades 5 inserted on the rotating shaft II4. The mixing blades 5 are evenly distributed along the circumference and axial direction of the rotating shaft II4. The metering section includes a rotating shaft III6 inserted into the rotating shaft II4 and helical metering blades 7 mounted on the rotating shaft III6. The pitch of the helical metering blades 7 is smaller than the pitch of the helical conveying blades 2. The diameters of the rotating shafts I1, II4, and III6 are equal. The length of the mixing section is greater than the length of the conveying section, and the length of the conveying section is greater than the length of the metering section. The mixing blades are three-bladed propeller blades, paddle blades, or anchor blades.
[0016] Shaft ends are provided at the outer ends of rotating shaft I1 and rotating shaft III6. The inner end of rotating shaft I1 is connected to rotating shaft II4, and the inner end of rotating shaft II4 is connected to rotating shaft III6 via key 3 and keyway. Sealing grooves are provided at the inner ends of rotating shaft I1 and rotating shaft III6, and at both ends of rotating shaft II4. Sealing rings are installed in the sealing grooves to prevent materials from getting stuck at the joint between the rotating shafts and affecting the transmission effect.
[0017] The segmented screw structure described in this invention only requires each segment to be quickly assembled using a key, resulting in a reasonable structure and easier use.
[0018] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A segmented screw structure for a screw extruder, characterized in that, The screw is provided with a conveying section, a mixing section, and a metering section; the conveying section includes a rotating shaft I and helical conveying blades mounted on the rotating shaft I; the mixing section includes a rotating shaft II inserted into the rotating shaft I and a plurality of mixing blades inserted into the rotating shaft II, the mixing blades being evenly distributed along the circumference and axial direction of the rotating shaft II; the metering section includes a rotating shaft III inserted into the rotating shaft II and helical metering blades mounted on the rotating shaft III, the pitch of the helical metering blades being smaller than the pitch of the helical conveying blades, and the diameters of the rotating shafts I, II, and III being equal.
2. The segmented screw structure of a screw extruder according to claim 1, characterized in that, Shaft ends are provided at the outer ends of rotating shaft I and rotating shaft III. The inner ends of rotating shaft I and rotating shaft II, and rotating shaft II and rotating shaft III are connected by key and keyway transmission.
3. A segmented screw structure for a screw extruder according to claim 1 or 2, characterized in that, Sealing grooves are provided at the inner ends of rotating shaft I and rotating shaft III, and at both ends of rotating shaft II, and sealing rings are installed in the sealing grooves.
4. The segmented screw structure of a screw extruder according to claim 1, characterized in that, The length of the mixing section is greater than the length of the conveying section, and the length of the conveying section is greater than the length of the metering section.
5. The segmented screw structure of a screw extruder according to claim 1, characterized in that, The mixing blades are three-bladed propulsion blades, paddle blades, or anchor blades.