A low shear reamer

Abstract

The application discloses a low-shear reamer, and belongs to the technical field of mechanical cutters. The reamer comprises a reamer base body, a central assembly hole and a plurality of radially arranged cutter arms; a cutting edge is arranged on the rotation advancing side of the cutter arm; the geometric line of the cutting edge edge is inclined towards the center of the reamer and the rear direction of the reamer rotation from the maximum outer diameter point to the minimum inner diameter point; the radial reference line and the geometric line form an included angle A on the outside of the cutting edge; and the included angle A is greater than 1°. The application solves the problem that, when the existing radial blade reamer processes materials such as fibers and vines, the materials are easy to swing and accumulate and wind along the blade surface, the load of the cutter arm is increased, the fine powder is increased, the shearing heat is large, the heat-sensitive materials are easy to deteriorate, and even the equipment is blocked and stopped. The application changes the stress direction of the materials by using the inclined cutting edge, suppresses the winding and accumulation of fibers, realizes oblique shearing, reduces extrusion and rubbing, and reduces fine powder and shearing heat; the installation size of the reamer is compatible with that of the traditional reamer, the existing reamer can be directly replaced, the main machine does not need to be modified, and the reamer is suitable for extrusion and cutting operation of materials such as feed, food, biology and chemical industry.

Description

Technical Field

[0001] This invention relates to the field of mechanical cutting tool technology, and more specifically to a low-shear auger. Background Technology

[0002] Cutter cutters are commonly used for material crushing, mixing, or cutting. When processing materials containing fibers or vines, the cutting edges of existing cutters are mostly arranged radially. When debris comes into contact with the cutting edge, it is easily thrown along the edge surface to the outside of the cutter arm and gradually accumulates and becomes entangled. This leads to increased load on the cutter arm, decreased operating efficiency, easy generation of fine powder, and shear heat. Heat-sensitive materials are easily deteriorated by heat, and in severe cases, it can cause equipment blockage and shutdown.

[0003] In existing technologies, the blades of the auger are generally arranged in a straight radial direction. During the rotation operation, there is a lack of ability to collect and guide the entangled debris. The entangled material continues to accumulate on the outer ring, which can easily clog the matching extrusion components. If the shearing gap is simply increased, the crushing and cutting effect will be insufficient, making it difficult to meet the requirements of crushing capacity, anti-entanglement, and low shearing heat generation. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-shear auger to solve the technical problems of existing augers where entangled debris accumulates outwards during operation, easily causing equipment blockage, high shearing heat generation, and easy deterioration of heat-sensitive materials. This invention achieves shearing and crushing while simultaneously gathering entangled debris towards the center of the auger, reducing the risk of external blockage and reducing shearing heat generation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-shear auger includes an auger body, a central mounting hole, and a plurality of radially arranged cutter arms; each cutter arm is provided with a cutting edge, which is located on the rotational advancing side of the cutter arm as it rotates with the auger. A radial reference line is formed by connecting the center point of the central mounting hole with the maximum outer diameter point of the cutting edge; the maximum outer diameter point of the cutting edge is taken as the vertex of the included angle; a geometric line is drawn connecting the maximum outer diameter point of the cutting edge with the minimum inner diameter point of the cutting edge; this geometric line deviates from the maximum outer diameter point to the minimum inner diameter point, and at the same time deviates towards the center of the reamer and the rear direction of the reamer's rotation. The radial reference line and the geometric connection line form an angle A on the outside of the cutting edge.

[0006] Furthermore, the included angle A is greater than 1°.

[0007] Furthermore, the cutting edge is a straight cutting edge or a circular arc transition cutting edge.

[0008] The working principle of this invention is as follows: The auger rotates around the central mounting hole, with the cutting edge located on the forward rotation side of the cutter arm, and the working surface of the cutting edge facing the material. The geometric line connecting the maximum outer diameter point and the minimum inner diameter point of the cutting edge is simultaneously inclined towards the center of the auger and towards the rear after rotation. When fibers and entangled debris come into contact with this inclined surface, the contact force decomposes to generate a component force pointing towards the center of the auger, driving the entangled debris to continuously slide and accumulate towards the center of the auger along the working surface of the cutting edge. The debris gathers in the central area, away from the outer ring of the auger, reducing outward accumulation and entanglement. At the same time, the inclined surface structure reduces severe shearing and crushing, reduces the generation of fine powder, suppresses shear heat generation, and protects heat-sensitive materials.

[0009] It should be noted that if the geometric connection line deviates from the point of maximum outer diameter to the point of minimum inner diameter towards the side of rotational advance, even if the connection line points to the center of the auger, the component force on the cutting surface will push the debris towards the outer ring of the auger, and the debris will easily accumulate on the outer ring, causing entanglement and blockage, thus failing to achieve the technical effect of this invention; if the cutting edge is arranged on the rear side of the rotating cutter arm, the cutter arm base contacts the material first, and the cutting edge only passively scrapes the material, which also fails to achieve the goal of collecting the debris inward. Beneficial effects

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The cutting edge of this invention adopts a specific geometric oblique structure. The auger rotates and operates. While completing the shearing and crushing of materials, it relies on the component force of the oblique surface of the cutting edge to gather the entangled fibers, impurities and other debris towards the center of the auger, avoiding the accumulation of debris on the outer ring and significantly reducing the probability of equipment blockage failure.

[0011] 2. The inclined cutting structure of this invention weakens the high-intensity crushing and shearing, reduces the generation of fine powder, and lowers the shear heat, making it suitable for processing heat-sensitive materials and preventing the materials from deteriorating due to heat.

[0012] 3. The structure is simple and reliable. It can use a straight cutting edge or be machined into a rounded transition blunt cutting edge that is easy to machine. The number of tool arms can be flexibly selected according to the working conditions, and the machining and assembly are convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the low-shear auger of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1-Auger base; 2-Center mounting hole; 3-Auger arm; 4-Cutting edge; 5-Radial reference line; 6-Geometric connection line; A-Included angle; Arc-shaped arrow indicates the auger rotation direction. Detailed Implementation

[0015] The specific embodiments of the invention will be further described in detail below with reference to the accompanying drawings.

[0016] like Figure 1As shown, this embodiment discloses a low-shear auger, including an auger base 1, a central mounting hole 2, and a plurality of radially arranged cutter arms 3; the cutter arms 3 are provided with cutting edges 4, which are located on the rotating forward side of the cutter arm 3 as the auger rotates. The center point of the connecting center assembly hole 2 and the maximum outer diameter point of the cutting edge 4 form a radial reference line 5; the maximum outer diameter point of the cutting edge 4 is used as the vertex of the included angle; the maximum outer diameter point of the cutting edge 4 and the minimum inner diameter point of the cutting edge are geometrically connected by a line 6; the geometric line 6 is inclined from the maximum outer diameter point to the minimum inner diameter point, and at the same time towards the center of the reamer and the rear direction of the reamer rotation; the radial reference line 5 and the geometric line 6 form an included angle A on the outside of the cutting edge.

[0017] In this embodiment, the included angle A is greater than 1°; there are a total of 6 cutter arms, evenly distributed in a ring on the auger base; the cutting edge 4 adopts a straight cutting edge; as an alternative embodiment, the edge of the cutting edge is machined to be blunt, or it can be set as a rounded transition cutting edge. The working surface of the cutting edge is an inclined plane defined by geometric lines, and the inclined plane faces the direction of rotation and forward movement of the auger.

[0018] The working process of this embodiment is as follows: The auger rotates around the central mounting hole, and the arc arrow in the figure indicates the direction of rotation; the cutting edge faces the material to shear and crush it; the entangled material contacts the inclined surface of the cutting edge, and the inclined surface generates a component force pointing towards the center of the auger. The entangled debris slides and gathers along the cutting edge towards the center of the auger. The debris stays in the central area of ​​the auger and will not migrate and accumulate in large quantities to the outer circle; the inclined cutting method reduces violent shearing and reduces the production of fine powder and shear heat, which is suitable for processing heat-sensitive materials.

[0019] In contrast, if the geometric connection of the cutting edge is tilted towards the side of rotational advance, or if the cutting edge is located on the rear side of the tool arm rotation, it will be impossible to generate an inward-converging component force, and debris will accumulate and entangle on the outer ring, easily causing equipment blockage.

[0020] The above are preferred embodiments of the present invention, but the present invention is not limited to these embodiments. The number of blades, the included angle, and the form of the cutting edge can be adapted to the actual working conditions. All modifications made under the technical concept of the present invention fall within the protection scope of the present invention.

Claims

1. A low-shear reamer, comprising a reamer base, a central mounting hole, and a plurality of radially arranged cutter arms; characterized in that: The cutter arm is provided with a cutting edge, which is located on the forward rotation side of the cutter arm as it rotates with the auger. A radial reference line is formed by connecting the center point of the central mounting hole and the maximum outer diameter point of the cutting edge. The maximum outer diameter point of the cutting edge is used as the vertex of the included angle. A geometric line is drawn connecting the maximum outer diameter point and the minimum inner diameter point of the cutting edge. This geometric line deviates from the maximum outer diameter point to the minimum inner diameter point, while also deviating towards the center of the auger and the rear direction of the auger's rotation. An angle A is formed between the radial reference line and this geometric line on the outer side of the cutting edge.

2. The low-shear auger according to claim 1, characterized in that, The included angle A is greater than 1°.

3. The low-shear auger according to claim 1, characterized in that, The cutting edge is either a straight cutting edge or a rounded cutting edge.

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