CN111376404B

CN111376404B - Feeding mixing impeller unit and feeding mixing impeller

Info

Publication number: CN111376404B
Application number: CN201910221720.3A
Authority: CN
Inventors: 韩泽良
Original assignee: Xingtai Xinde New Materials Technology Co ltd
Current assignee: Xingtai Xinde New Materials Technology Co ltd
Priority date: 2018-12-28
Filing date: 2019-03-22
Publication date: 2024-07-09
Anticipated expiration: 2039-03-22
Also published as: CN210233584U; CN111376404A

Abstract

The invention discloses a feeding mixing impeller unit and a feeding mixing impeller, wherein the feeding mixing impeller unit comprises a base body and at least one mixing tooth connected to the base body; comprising a base and at least one mixing tooth attached to said base; wherein the substrate has a rotation axis and is rotatable about the rotation axis; each mixing tooth is of a straight rod structure and is provided with an extending axis in the length direction; each mixing tooth has a fixed end connected to the base body and a working end radially and tangentially away from the axis of rotation in the direction of rotation of the base body. The beneficial effects of the invention are as follows: improves isotropy of the chopped fiber and realizes equal-proportion input and output of materials.

Description

Feeding mixing impeller unit and feeding mixing impeller

Technical Field

The invention relates to the technical field of conveying mixing equipment, in particular to a feeding mixing impeller unit and a feeding mixing impeller.

Background

In the preparation process of the chopped fiber reinforced composite material, fibers (solid) and resin materials (liquid) are required to be uniformly mixed, and the fibers have better isotropy so as to improve the stress performance of the composite material product in all directions and reduce the problems of air hole defects in the product and the like. At present, a conveying and mixing device is generally adopted to mix fibers and resin materials.

When the conventional mixing equipment is used for mixing chopped fibers and resin materials, the isotropy of the chopped fibers is poor, the fiber distribution is uneven, and the mixing uniformity with the resin materials is low, so that the internal air holes of a composite material product are increased, and the local stress performance is poor. The input mixing ratio of the materials is not well controlled.

And the existing mixing equipment cannot realize continuous input, continuous conveying and continuous output of materials, and further cannot realize continuous production of required products.

Therefore, how to provide a mixing device capable of improving isotropy of chopped fibers and realizing equal-proportion input and output of materials is an important technical problem that a person skilled in the art needs to solve at present.

Disclosure of Invention

In order to solve the technical problems, the invention provides a feeding mixing impeller unit which is used for solving the problems of improving isotropy of chopped fibers and realizing equal-proportion input and output of materials.

In order to achieve the above purpose, the present invention provides the following technical solutions:

A feed mixing impeller unit comprising a base and at least one mixing tooth attached to the base; wherein,

The substrate is provided with a rotation axis and can rotate around the rotation axis;

Each mixing tooth is of a straight rod structure and is provided with an extending axis in the length direction;

Each mixing tooth has a fixed end connected with the base body and a working end which is radially and tangentially distant from the rotation axis along the rotation direction of the base body, and the position between the extension axis of each mixing tooth and the rotation axis meets the following relation:

The projection of the extension axis on the corresponding first projection plane forms an included angle of 5-17 degrees with the rotation axis; wherein the first projection surface corresponding to each extension axis is formed by the rotation axis and a straight line which is parallel to the rotation axis and intersects with the extension axis;

The projection of the extension axis on the corresponding second projection plane forms an included angle of 15-27 degrees with the rotation axis; the second projection surface corresponding to each extension axis is intersected with and perpendicular to the first projection surface, and the intersection line of the first projection surface and the second projection surface is the rotation axis.

The feeding mixing impeller unit comprises a base body and at least one mixing tooth, wherein one end of each mixing tooth is connected with the base body, and the other end of each mixing tooth is simultaneously far away from the axis of the base body along the tangential direction and the radial direction of the rotation direction of the base body; all the mixing teeth in the impeller units are arranged to form at least one group of mixing teeth, and the working ends of the mixing teeth in each group of mixing teeth are uniformly distributed along a spiral line; the mixing teeth of the structure are beneficial to fully scattering the chopped fibers and improving isotropy of the chopped fibers when mixing the chopped fibers and the resin materials, and can generate propelling force on materials in the mixing process, so that mixing and conveying of the materials are simultaneously carried out, isotropy of the chopped fibers and the resin materials can be improved, and equal-proportion input and output of the materials are realized.

Alternatively, each mixing tooth is of constant or variable cross-section configuration and has a cross-section that is one of rectangular, trapezoidal, triangular, circular or polygonal.

Further, each mixing tooth has a constant cross-section structure and a rectangular cross section;

The surface of the mixing teeth is formed with four planes, and one plane faces away from the base body and forms an included angle of 10-20 degrees with the rotation axis.

Further, the working end of at least one mixing tooth is formed with a scraping end surface, wherein,

The scraping end face is a plane, and an included angle between the scraping end face and the rotation axis is 0-10 degrees; or alternatively, the first and second heat exchangers may be,

The scraping end face is an arc face, and an included angle between a bus of the arc face and the rotation axis is 0-10 degrees.

Further, in the extending direction of the rotation axis, the length of the portion of each mixing tooth in contact with the base body is equal to the length of the base body.

Further, in the extending direction of the rotation axis, the length of the portion of each mixing tooth in contact with the base body is smaller than the length of the base body, and a gap is provided between the portion of the mixing tooth not in contact with the base body and the base body.

Further, at least one support rod is arranged between the part, which is not contacted with the base body, of the at least one mixing tooth and the base body, and two ends of each support rod are respectively connected with the corresponding mixing tooth and the base body.

Further, a gap is formed between the mixing teeth provided with the supporting rods and the corresponding supporting rods and the matrix.

Optionally, the substrate is of a constant cross section or variable cross section structure, and the outer profile of the cross section of the substrate is of a central symmetrical pattern.

Further, the base body is of a cylindrical structure, and is connected with 2 to 6 mixing teeth with the same rotation direction, and the 2 to 6 mixing teeth are uniformly distributed in the circumferential direction of the base body.

Optionally, a through hole coaxial with the rotation axis is formed in the base body, and a key groove is formed in the inner wall of the through hole.

The invention also provides a feeding mixing impeller which comprises a plurality of feeding mixing impeller units which are sequentially and coaxially connected and provided by the technical scheme, wherein the rotation directions of all mixing teeth in the plurality of impeller units are the same and are arranged to form at least one group of mixing teeth, and the working ends of the plurality of mixing teeth in each mixing teeth group are uniformly distributed along a spiral line.

Optionally, the helix in each mixing tooth group has an angle of rise of 60 ° to 80 °.

Further, in each mixing tooth group, 10 to 20 mixing teeth are provided on one lead of the spiral line.

Alternatively, when the working end of each mixing tooth is formed with the scraping end face, in each mixing tooth group, the distance between the two opposite ends between the scraping end faces of two adjacent mixing teeth on the spiral line in the arrangement direction of the plurality of impeller units is 0mm to 10mm.

Further, in every two adjacent impeller units, at least one connecting rod is arranged between at least one mixing tooth on one impeller unit and a matrix of the other impeller unit; the two ends of each connecting rod are respectively connected with the corresponding mixing teeth and the matrix.

Further, a gap is formed between each connecting rod and the corresponding mixing tooth and base.

Optionally, the impeller units are connected through a transmission shaft coaxially arranged with the impeller units, a fan blade is arranged at one end of the transmission shaft away from the working ends of the mixing teeth, and the rotation direction of the fan blade is used for forming air flow flowing to the mixing teeth.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a feeding mixing device according to an embodiment of the present invention;

FIG. 2 is a schematic view of a feed mixing impeller according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a feed impeller unit according to an embodiment of the present invention;

FIG. 4 is a schematic view of another angle configuration of the impeller unit shown in FIG. 3;

FIG. 5a is a schematic view of another angle of the impeller unit shown in FIG. 3;

FIG. 5b is a schematic view of another angle of the impeller unit shown in FIG. 3;

FIG. 6a is a schematic diagram of a feed impeller unit according to an embodiment of the present invention;

fig. 6b is a schematic diagram of another structure of a feeding impeller unit according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

In actual use, the feeding mixing impeller unit provided by the embodiment of the invention needs to coaxially connect a plurality of impeller units to form a mixing impeller, and is matched with a mixing cylinder sleeved outside the impeller and a driving mechanism for driving the impeller to rotate together.

Referring to fig. 1, a mixing device is formed by a mixing impeller, a mixing drum and a driving mechanism, and the mixing device comprises a feeding mixing impeller 10, a mixing drum 20 and a driving mechanism which is not shown in the figure, and the feeding mixing impeller comprises a plurality of impeller units which are sequentially and coaxially connected with each other, as shown in fig. 2.

Referring to fig. 3, each impeller unit 11 includes a base 111 and 3 mixing teeth 112 coupled to the base 111; wherein the base 111 has a rotation axis 01 and is rotatable about the rotation axis 01; each mixing tooth 112 is a straight bar structure and has an axis of extension 02 in the length direction. In a specific implementation, the number of the mixing teeth 112 on each impeller unit 11 is at least one, and the number of the mixing teeth 112 can be set to be 1-6 according to actual use requirements; the rotation axis 01 and the extension axis 02 in the embodiment of the present invention are virtual reference lines provided for the convenience of description of the structure of the impeller unit 11, and are not actual structures.

Referring to fig. 3, each mixing tooth 112 has a fixed end 1121 and a working end 1122, wherein the fixed end 1121 is connected to the base 111 and the working end 1122 is not in direct contact with the base 111. In the impeller unit 11 provided in the embodiment of the present invention, the structural relationship between the mixing teeth 112 and the base 111 may be considered as being formed by the movement of the working end 1122 of the mixing teeth 112 away from the rotation axis 01 of the base 111 along two perpendicular directions, and as shown in fig. 4, the working end 1122 is simultaneously away from the rotation axis 01 along the radial direction x and the tangential direction y of the rotation direction of the base 111, so as to form the mixing teeth 112 with the structure shown in fig. 3 and 4, and the extension axis 02 of the mixing teeth 112 and the rotation axis 01 are non-parallel and non-intersecting out-of-plane straight lines.

For the convenience of description of the position between the extension axis 02 and the rotation axis 01 of each mixing tooth 112, referring to fig. 5a and 5B, the embodiment of the present invention is assisted by using the projection of the extension axis 02 on two projection planes, where a first projection plane a corresponding to one mixing tooth 112 shown in fig. 5a is formed by the rotation axis 01 and a straight line 03 parallel to the rotation axis 01 and intersecting with the extension axis 02 of the mixing tooth 112, a second projection plane B corresponding to the mixing tooth 112 shown in fig. 5B intersects with and is perpendicular to the first projection plane a, and the intersection line of the first projection plane a and the second projection plane B is the rotation axis 01. The first projection plane a and the second projection plane B are not actually configured as such.

As shown in fig. 5a, the projection of the extension axis 02 on the first projection plane a forms an angle α with the rotation axis 01, and as shown in fig. 5B, the projection of the extension axis 02 on the corresponding second projection plane B forms an angle β with the rotation axis 01. The angle α causes each mixing tooth 112 to flare out relative to the base 111, which produces a mixing action, and the angle α causes each mixing tooth 112 to tilt relative to the base 111, which produces a conveying action. In order to achieve a relatively optimal mixing and conveying efficiency, in this embodiment, the included angle α is 5 ° to 17 °, and the included angle β is 15 ° to 27 °.

In the embodiment, when the mixing device is used for mixing and conveying foamed polyurethane and chopped glass fibers, the polyurethane is composed of organic polyisocyanate and polyhydroxy compound, the setting time is about 90 seconds, the length of the glass fibers is about 6mm, the diameter is about 13 μm, and the proportion of the glass fibers in the materials to be mixed is about 45%, in this case, the angle alpha is set to 12 degrees, the angle beta is set to 22 degrees, and experiments prove that the polyurethane and the glass fibers can achieve ideal mixing uniformity, and the isotropy of the glass fibers is higher.

In specific implementation, the impeller unit 11 can be made of stainless steel materials, and special steel with better wear resistance is preferred to improve the service life; the special material can be manufactured by welding, casting, integrally forming, machining and the like.

In an embodiment of the present invention, as can be seen in conjunction with fig. 3 and 4, each mixing tooth 112 is of uniform cross-sectional configuration and rectangular in cross-section. In other alternative embodiments, the mixing teeth 112 may also be of constant or variable cross-section configuration, and have a cross-section that is one of rectangular, trapezoidal, triangular, circular or polygonal. The specific structure of the mixing teeth 112 is set according to the relevant parameters of the materials to be mixed, such as density, viscosity, etc.

In this embodiment, when the cross section of the mixing teeth 112 is rectangular, four planes are formed on the surface of the mixing teeth 112, and as shown in fig. 3 and 4, one of the planes faces away from the base 111 and has an included angle of 15 ° with the rotation axis 01, and it is known through experiments that the angle can further improve the mixing conveying efficiency of the mixing impeller. In other embodiments, the angle between the plane and the rotation axis 01 should be set according to the relevant parameters of the material itself, and may specifically be 10 ° to 20 °.

In order to facilitate the removal of the material remaining on the inner wall of the mixing drum 20, as shown in fig. 3, a scraping end surface 1124 is formed at the working end 1122 of the mixing teeth 112, and the scraping end surface 1124 makes the working end 1122 of the mixing teeth 112 angular, so that the material remaining on the inner wall of the mixing drum 20 can be scraped during the rotation of the impeller. In a specific implementation, the scraping end surface 1124 may be a plane or an arc surface, and the scraping end surface 1124 should be kept substantially parallel to the rotation axis 01, so as to ensure a larger contact area with the residual material on the cylinder wall, and improve the scraping efficiency. In this embodiment, referring to fig. 3, the scraping end surface 1124 is a plane and has an angle of 0 ° to 10 ° with the rotation axis 01. In other alternative embodiments, the scraping end surface 1124 is an arc surface, and the included angle between the generatrix of the arc surface and the rotation axis 01 is 0 ° to 10 °.

In order to ensure that the material adhering to the wall of the barrel is scraped off by the scraping end face 1124 as much as possible, the scraping end faces 1124 of the plurality of mixing teeth 112 should form a revolution surface covering the wall of the barrel after rotation, as shown in fig. 1, in each mixing tooth 112 group, a distance H between two opposite ends of the scraping end faces 1124 of two adjacent mixing teeth 112 on the spiral line in the arrangement direction of the plurality of impeller units 11 is 0mm to 10mm, so that the scraping end faces 1124 of the plurality of mixing teeth 112 form a substantially continuous revolution surface after rotation. Meanwhile, to further improve the scraping efficiency, the minimum distance between each scraping end face 1124 and the inner wall of the mixing drum 20 is 5mm to 10mm.

In the embodiment of the present invention, since the mixing teeth 112 have a rod-shaped structure, in order to ensure the connection stability of the working ends 1122 of the mixing teeth 112, a supporting structure may be disposed between the portion of the mixing teeth 112 not connected to the base 111 and the base 111, so as to support and fix the working ends 1122 of the mixing teeth 112, thereby improving the stability of the working ends 1122. The support structure has the following two arrangement modes according to different structures of the mixing teeth 112:

In one way, referring to fig. 6a, in the impeller unit 11a, in the extending direction of the rotation axis 01, the length L1 of the portion of each mixing tooth 112 in contact with the base 111 is equal to the length L2 of the base 111. In the impeller units 11 with the structure, no space is provided between the part of the mixing teeth 112 which is not contacted with the base 111 and the base 111, and then the supporting structure is required to be arranged on the adjacent impeller unit 1111b, as shown in fig. 6a, in the adjacent two impeller units 1111a and 11b, a connecting rod 113 is arranged between the mixing teeth 112 on one impeller unit 11 and the base 111 of the other impeller unit 11; both ends of each connecting rod 113 are connected to the corresponding mixing teeth 112 and the base 111, respectively. Specifically, the connecting rod 113 may be made of the same material as the base 111 or the mixing teeth 112, and is connected to the base 111 and the mixing teeth 112 by welding, bonding, casting, machining, or the like. The number of the connecting rods 113 between each mixing tooth 112 and the base 111 is at least one, and may be set to be a plurality according to practical requirements in practice. The connecting rod 113 serves to support the working end 1122 of the mixing teeth 112, thereby improving the stability of the working end 1122. As shown in fig. 6a, a gap is formed between the connecting rod 113 and the corresponding mixing teeth 112 and the base 111, and the gap can further play a role in scattering the material and preventing the material from falling too fast when mixing the material.

In a second mode, as shown in fig. 6b, in the extending direction of the rotation axis 01, the length L1 of the portion of each mixing tooth 112 in contact with the base 111 is smaller than the length L2 of the base 111, and a gap is provided between the portion of the mixing tooth 112 not in contact with the base 111 and the base 111. The impeller unit 11 of this structure may be configured such that a supporting structure is disposed between its own mixing teeth 112 and the base 111, and as shown in fig. 6b, a supporting rod 114 is disposed between a portion of the mixing teeth 112 not contacting the base 111 and the base 111, and both ends of each supporting rod 114 are connected to the corresponding mixing teeth 112 and base 111, respectively. Further, a gap is formed between the mixing teeth 112 provided with the support bars 114 and the corresponding support bars 114 and the base 111. The support rods 114 are made of materials, in number, in connection with, and in function of the voids, see one of the above-described modes.

Referring to fig. 3, in order to facilitate the processing of the base 111, in this embodiment, the base 111 has a cylindrical structure. The base 111 of the cylindrical structure is connected with 3 mixing teeth 112,3 with the same rotation direction, and the mixing teeth 112 are uniformly distributed in the circumferential direction of the base 111. In other embodiments, the number of mixing teeth 112 may be set to 2-6.

In other alternative embodiments, the base 111 may have a constant cross-section or a variable cross-section, and the outer profile of the cross-section of the base 111 is a central symmetrical pattern, so as to ensure the stability of the base 111 during rotation.

For the coaxial connection of the plurality of impeller units 11, as shown in fig. 4, a through hole 1111 coaxial with the rotation axis 01 is provided in the base 111, and a key groove 1112 is provided in the inner wall of the through hole 1111. Referring again to fig. 1 and 2, the plurality of impeller units 11 are connected by a drive shaft 12 coaxially disposed therewith, the drive shaft 12 passing through a through hole 1111 in each impeller unit 11.

When the plurality of impeller units 11 are combined for use, as shown in fig. 1 and 2, since 3 mixing teeth 112 are disposed on each impeller unit 11 in the embodiment, in the plurality of impeller units 11, all the mixing teeth 112 have the same rotation direction and are arranged to form 3 groups of mixing teeth 112, and the mixing teeth 112 in each impeller unit 11 and the mixing teeth 112 of the adjacent other impeller unit 11 are disposed at a certain angle in the circumferential direction of the rotation direction of the impeller unit 11, so that the working ends 1122 of the plurality of mixing teeth 112 in each mixing teeth 112 are uniformly distributed along the spiral line. The mixing teeth 112 distributed along the spiral line can play a role of spiral conveying, which is beneficial to improving the mixing conveying efficiency of materials. In particular, when the key grooves are machined, the positions of the key grooves 1112 in each two adjacent impeller units 11 should be offset by a certain angle in the circumferential direction of the rotation direction of the impeller units 11, so as to ensure that the working ends 1122 of the mixing teeth 112 in each impeller unit 11 are distributed along a spiral line.

In one embodiment, the helix angle of each mixing tooth 112 set is 60 ° to 80 °. In addition, in each mixing tooth 112 group, 10 to 20 mixing teeth 112 are provided on one lead of the spiral. The spiral line lift angle in the embodiment is 70 degrees, 14 mixing teeth 112 are arranged on one lead of the spiral line, and experimental results prove that the mixing impeller with the structure can ensure that polyurethane and glass fibers achieve ideal mixing uniformity, the isotropy of the glass fibers is higher, and the higher conveying speed is ensured.

In particular, at least one inlet for feeding in the material and at least one outlet 23 for discharging the mixed material should be provided in sequence along the conveying direction of the material on the mixing drum 20, so as to carry out the feeding in and feeding out of the material. In this embodiment, the mixing drum 20 is used vertically, the conveying direction of the materials is the vertical direction from top to bottom, and a first material feeding port 21 and a second material feeding port 22 are sequentially arranged on the wall of the mixing drum 20 along the conveying direction of the materials; wherein the first material is a solid material or a powder material, and the second material is a fluid material; the discharge port 23 is provided at the bottom end of the mixing drum 20. In a specific implementation, the number of the first material feeding hole 21 and the second material feeding hole 22 and the material types corresponding to the first material feeding hole and the second material feeding hole can be set according to actual requirements.

In a specific implementation, the first material inlet 21 may be used for inputting glass fibers, the second material inlet 22 may be used for inputting liquid polyurethane, as shown in fig. 1, after the glass fibers enter the mixing drum 20 from the first material inlet 21, the glass fibers are fully broken up by at least one impeller unit 11 in the downward movement process until the glass fibers are in a state with a certain bulk degree, and then the glass fibers are mixed with the liquid polyurethane entering from the second material inlet 22. The mixed materials are output from the lower discharge port 23 and can enter downstream equipment such as a die.

In practical use, the impeller units 11 may cause the internal air pressure of the mixing drum 20 to be greater than that of the external air pressure when rotating, and may cause the solid material or the liquid material with low viscosity to be blown back to the feed inlet when the solid material or the liquid material with low viscosity is fed into the feed inlet, which is not beneficial to uniform mixing of the materials. In a specific embodiment, an air pressure balance mechanism is disposed inside the mixing drum 20 at a side of the first material inlet 21 facing away from the second material inlet 22, and the air pressure balance mechanism is used for forming an air flow moving along the conveying direction of the material, so as to offset the air pressure generated by the impeller unit 11, and prevent the material from being blown back. In particular, the air pressure balancing mechanism may be an air nozzle or a fan disposed within the mixing drum 20.

In this embodiment, referring to fig. 1 and 2, the air pressure balancing mechanism is a fan 13 and is disposed at one end of the transmission shaft 12 away from the working ends 1122 of the plurality of mixing teeth 112, and the fan 13 can simultaneously generate downward air flow when the mixing impeller rotates.

The feeding mixing device provided by the invention is beneficial to fully scattering the chopped fibers and improving isotropy of the chopped fibers when mixing the chopped fibers and the resin materials, can generate propelling force on materials in the mixing process, and can realize simultaneous mixing and conveying of the materials, so that isotropy of the chopped fibers and the resin materials can be improved, and equal-proportion input and output of the materials can be realized.

The feeding and mixing device provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims

1. A feed mixing impeller unit comprising a base and at least one mixing tooth attached to said base; wherein,

The projection of the extension axis on the corresponding second projection plane forms an included angle of 15-27 degrees with the rotation axis; the second projection surface corresponding to each extension axis is intersected with and perpendicular to the first projection surface, and the intersection line of the first projection surface and the second projection surface is the rotation axis;

each mixing tooth is of a constant-section or variable-section structure, and the cross section of each mixing tooth is one of a rectangle, a trapezoid, a triangle and a circle;

the working end of at least one mixing tooth is provided with a scraping end surface, wherein,

The scraping end face is an arc face, and an included angle between a bus of the arc face and the rotation axis is 0-10 degrees;

The base body is provided with a through hole coaxial with the rotation axis, and the inner wall of the through hole is provided with a key groove.

2. The feed mixing impeller unit of claim 1, wherein each mixing tooth is of constant cross-sectional configuration and rectangular in cross-section;

3. The feed mixing impeller unit according to claim 1, wherein a length of a portion of each mixing tooth in contact with the base body in an extending direction of the rotation axis is equal to a length of the base body.

4. The feed mixing impeller unit according to claim 1, wherein a length of a portion of each mixing tooth in contact with the base body in an extending direction of the rotation axis is smaller than a length of the base body, and a gap is provided between a portion of the mixing tooth not in contact with the base body and the base body.

5. The feed mixing impeller unit of claim 4, wherein at least one support bar is disposed between the portion of the at least one mixing tooth not in contact with the base and the base, and each support bar is connected at both ends to the corresponding mixing tooth and the base, respectively.

6. The feed mixing impeller unit of claim 5, wherein a gap is formed between the mixing teeth provided with the support bars and the corresponding support bars and the base body.

7. The feed mixing impeller unit of claim 1, wherein the base is of constant or variable cross-section configuration and the cross-sectional outer profile of the base is a centrosymmetric pattern.

8. The feed mixing impeller unit according to claim 6, wherein the base body has a cylindrical structure, and 2 to 6 mixing teeth having the same rotation direction are connected thereto, and the 2 to 6 mixing teeth are uniformly distributed in the circumferential direction of the base body.

9. A feed mixing impeller comprising a plurality of feed mixing impeller units according to any one of claims 1-8 coaxially connected in sequence, wherein the rotation directions of all mixing teeth in the plurality of impeller units are the same and are arranged to form at least one mixing tooth set, and the working ends of the plurality of mixing teeth in each mixing tooth set are uniformly distributed along a spiral line.

10. The feed mixing impeller of claim 9 wherein the helix angle of the helix in each mixing tooth set is 60 ° to 80 °.

11. The feed mixing impeller of claim 10 wherein there are 10 to 20 mixing teeth on one lead of the spiral in each mixing tooth set.

12. The feed mixing impeller according to claim 9, wherein when the working end of each mixing tooth is formed with a scraping end face, a distance between opposite ends between scraping end faces of two adjacent mixing teeth on a spiral line in each mixing tooth group is 0mm to 10mm in an arrangement direction of the plurality of impeller units.

13. The feed mixing impeller of claim 9 wherein at least one connecting rod is provided between at least one mixing tooth on one impeller unit and the base of the other impeller unit in each adjacent two impeller units; the two ends of each connecting rod are respectively connected with the corresponding mixing teeth and the matrix.

14. The feed mixing impeller of claim 13 wherein a gap is formed between each connecting rod and the corresponding mixing tooth and base.

15. The feed mixing impeller of claim 9 wherein the plurality of impeller units are connected by a drive shaft coaxially disposed therewith, the drive shaft being provided with blades at an end thereof remote from the working ends of the plurality of mixing teeth, the direction of rotation of the blades being for creating an air flow to the plurality of mixing teeth.