Double-helical-ribbon mixing and stirring shaft

Abstract

A double-helical-ribbon mixing stirring shaft comprises a center shaft, two helical ribbons are fixedly connected to the center shaft, the two helical ribbons are the helical ribbon A and the helical ribbon B respectively, the rotating directions of the two helical ribbons are opposite, the axial direction of the center shaft is defined as the left-right direction, the screw pitch of the helical ribbon A is gradually increased from left to right, and the screw pitch of the helical ribbon B is gradually increased from right to left. The length part, where the helical ribbon is welded, of the central shaft is a regular polygon prism. Compared with an existing uniform-pitch structure mixer and a variable-pitch helical ribbon mixer, the mixing shaft has the advantages that the mixing efficiency and the mixing uniformity are greatly improved, the polygon prism central shaft can play a role in assisting in stirring and mixing, and the mixing effect is enhanced.

Description

Technical Field

[0001] This utility model relates to a mixing machine, and in particular to a double-ribbon mixing and stirring shaft, belonging to the field of mechanical technology. Background Technology

[0002] The double-ribbon mixer is a commonly used mixing equipment, often used in the production of biomass pellets, feed, and other ingredients. Its core component is the double-ribbon mixing shaft. Existing double-ribbon mixing shafts have two ribbons with opposite directions of rotation fixedly connected on the same shaft. Typically, the outer ribbon gathers the material from both sides to the center, while the inner ribbon transports the material from the center to both sides. In this way, under the rotation of the ribbons, the material forms a circulating flow process in the cylinder from both ends to the middle and then from the middle to both ends. This large-scale material flow is called convection. Through convection, materials at different locations can quickly exchange positions, thereby achieving material mixing. The mixing principle involves multiple actions such as shearing, convection, and diffusion. There are many existing double-ribbon mixers, such as the double-ribbon mixer for concentrated feed disclosed in CN216964412U, a horizontal double-ribbon feed mixer disclosed in CN211677241U, and a double-ribbon stirring shaft for a mixer disclosed in CN216171482U. The mixing efficiency of existing double-ribbon mixers is usually achieved by increasing the mixing capacity of the equipment, which increases the cost. How to improve the mixing efficiency of double-ribbon mixers based on existing technology is a problem that various manufacturers are researching. Summary of the Invention

[0003] The purpose of this invention is to provide a double-ribbon mixing shaft with higher mixing efficiency.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: a double-ribbon mixing and stirring shaft, including a central shaft, on which two ribbons are fixedly connected, the two ribbons being ribbon A and ribbon B respectively, the two ribbons having opposite rotation directions, the axis of the central shaft being defined as the left and right direction, the pitch of ribbon A gradually increasing from left to right, and the pitch of ribbon B gradually increasing from right to left.

[0005] Furthermore, the length portion of the welded ribbon on the central shaft is a regular polygonal prism.

[0006] Furthermore, the length portion of the welded ribbon on the central shaft is a square shaft.

[0007] The beneficial technical effects of this invention are as follows: When this stirring shaft is used in a double-ribbon mixer, as the conveying volume of ribbon A gradually increases during the process of conveying material from left to right, gaps will be generated at the pitch junctions. This allows material from ribbon B to fall into the material layer conveyed by ribbon A, creating multiple mixing points throughout the left-to-right process. Compared to existing double-ribbon mixers with equal pitch structures, the variable-pitch ribbon mixer significantly improves mixing efficiency and uniformity. The multi-faceted central shaft further assists in stirring and mixing, enhancing the mixing effect. Attached Figure Description

[0008] Figure 1 This is an overall schematic diagram of the present invention.

[0009] Figure 2 This is a schematic diagram of a variable pitch screw. Detailed Implementation

[0010] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0011] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: central shaft; 2: threaded ribbon A; 3: threaded ribbon B.

[0012] As attached Figure 1 Appendix Figure 2 As shown, a double-ribbon mixing shaft includes a central shaft 1, on which two ribbons, ribbon A2 and ribbon B3, are fixedly connected. The two ribbons have opposite directions of rotation. The axis of the central shaft is defined as the left-right direction. The pitch of ribbon A gradually increases from left to right. Figure 2 The pitch described is the pitch of the screw ribbon A, where pitch 1 < pitch 2 < pitch 3 < pitch 3, and the pitch of the screw ribbon B gradually increases from right to left.

[0013] As a further optimization, the length of the central shaft with the helical ribbon is a regular polygonal prism; specifically, the length of the central shaft with the welded helical ribbon is a square shaft. The shapes of regular polygonal prisms and square shafts are well-known in the industry and are not shown in the figure. Because this type of shaft has sharp edges, it can enhance the mixing effect during material preparation.

[0014] This mixing shaft is used in a twin ribbon mixer and is installed and used in the same way as the mixing shaft on an existing twin ribbon mixer.

[0015] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. A double-ribbon mixing shaft, comprising a central shaft, on which two ribbons are fixedly connected, the two ribbons being ribbon A and ribbon B, the two ribbons having opposite directions of rotation, characterized in that: Define the axis of the central shaft as the left-right direction. The pitch of the screw ribbon A gradually increases from left to right, and the pitch of the screw ribbon B gradually increases from right to left.

2. The double-ribbon mixing shaft according to claim 1, characterized in that: The length of the welded ribbon on the central shaft is a regular polygonal prism.

3. The double-ribbon mixing shaft according to claim 2, characterized in that: The length of the welded ribbon on the central shaft is a square shaft.

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