Gravity type mixing bin

Abstract

The invention relates to the technical field of mixing bins, and discloses a gravity type mixing bin which comprises a bin body, at least one center mixing assembly and at least one bin wall mixing assembly, and a center shaft is arranged in the bin body; the central mixing assembly is fixed on the central shaft; the center mixing assembly is configured to force materials around the center mixing assembly to move towards the lower side opening of the stock bin body in the first direction. The bin wall mixing assembly is fixed to the inner wall of the stock bin body. The bin wall mixing assembly is configured to force materials around the bin wall mixing assembly to move towards the opening in the lower side of the bin body in the second direction; wherein the material flow in the first direction and the material flow in the second direction are in reverse flow at the contact position. According to the gravity type mixing bin, reverse material flow is adopted, so that materials at different positions are fully contacted and mixed, and the mixing uniformity of the materials is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blending silos, and particularly to a gravity blending silo. Background Art

[0002] A gravity blending silo is a solid silo that uses the gravity of materials for mixing, and is widely used in industries such as chemical engineering, plastics, and grain, mainly for storing and mixing solid particles or powdered materials. The gravity blending silo realizes the mixing of materials in different batches or with different properties by setting a blending device inside the silo and using the natural flow of materials during the discharging process, so that the physical property parameters such as density, particle size, water content, and melt index change reach uniformity and stability. The gravity blending silo relies entirely on the gravity of materials for mixing, without additional power devices, energy-saving and low operating costs, with a mixing efficiency of over 90% and a stable mixing effect.

[0003] In the case of EPOE (ethylene-octene copolymer) in the blending silo, when using a traditional wall-attached tube-type blending silo, the diameter of the blending tube is small, and the cross-sectional area of the blending working chamber is small. A large number of EPOE particles entering the blending tube are likely to cause particle accumulation. Under the action of gravity, the EPOE particles are squeezed and deformed, and due to their own viscosity, they are extremely likely to adhere to the inner wall of the blending tube, forming a bridge, causing more particle accumulation and making the bridge more serious, affecting the blending effect. Summary of the Invention

[0004] In view of this, the present invention provides a gravity blending silo to solve the above problems existing in the traditional wall-attached tube-type blending silo.

[0005] The present invention provides a gravity blending silo, comprising:

[0006] A silo main body, with a central axis provided inside the silo main body;

[0007] At least one set of central blending components, fixed on the central axis; the central blending components are configured to force the materials around the central blending components to move along a first direction towards the lower opening of the silo main body;

[0008] At least one set of silo wall blending components, fixed on the inner wall of the silo; the silo wall blending components are configured to force the materials around the silo wall blending components to move along a second direction towards the lower opening of the silo main body;

[0009] Wherein, the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point.

[0010] Beneficial effects: The gravity blending bin in the present invention is used for EPOE particles. During use, the EPOE particles fall in the bin body by their own gravity. After contacting the central blending component, along the trajectory set by the central blending component, under the guidance of gravity and the component structure, they move downward along the first direction towards the lower opening of the bin body. At the same time, part of the material contacts the bin wall blending component under the action of gravity and, affected by its structure, moves towards the lower opening of the bin body along the second direction. Since the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point, they continuously intertwine and collide during the downward movement. The reverse material flow enables the materials at different positions to fully contact and mix, effectively improving the blending uniformity of the materials, making the physical property parameters of the mixed materials, such as density, particle size, etc., more stable and consistent, and better meeting the production requirements for the mixing quality of the materials. During the reverse flow of the materials, due to the absence of pipeline restrictions, the materials are not easily accumulated in local areas of the bin, reducing the blockage caused by material aggregation, ensuring that the bin can operate continuously and stably, guaranteeing the smoothness of the production process, and improving production efficiency.

[0011] In an alternative embodiment, both the central blending component and the bin wall blending component are spiral structures, and their spiral directions are opposite.

[0012] Beneficial effects: The material enters the bin under the action of gravity. During the falling process, the material near the central axis contacts the spiral structure of the central blending component and, under the spiral guidance, moves obliquely downward and rotates around the central axis towards the lower opening of the bin body along the direction set by the central spiral (assuming the central spiral is clockwise); while the material near the inner wall of the bin contacts the spiral structure of the bin wall blending component. Since the spiral direction of the bin wall is opposite to that of the central spiral (i.e., counterclockwise), these materials also move obliquely downward and rotate around the inner wall of the bin along the bin wall spiral towards the lower opening of the bin body. During this process, the movement directions of the two parts of the material form a reverse, constantly interpenetrating and colliding with each other.

[0013] In an alternative embodiment:

[0014] The central blending component is a double - spiral structure, the spiral diameter is less than or equal to 1 / 4 of the diameter of the bin body, and the pitch is equal to the spiral diameter;

[0015] The bin wall blending component is composed of four groups of bin wall spiral structures, and the four groups of bin wall spiral structures are evenly distributed at intervals of 90° along the circumferential direction of the inner wall of the bin.

[0016] In an alternative embodiment, the connection between the spiral structure and the central axis and the inner wall of the bin body adopts an arc transition, and the arc radius is greater than or equal to 10 times the diameter of the material particles.

[0017] Beneficial effects: During the movement, the material passes through the connection between the spiral structure and the central axis and the inner wall of the silo body. Since the connection uses an arc transition design with an arc radius greater than or equal to 10 times the diameter of the material particles and is polished smoothly, when the material passes through here, it will not be blocked by sharp edges and corners, and can move forward smoothly along the spiral trajectory, maintaining a relatively stable flow state and continuously moving towards the discharge port.

[0018] In an alternative embodiment, both the central blending component and the silo wall blending component are paddle blade structures, and the inclination direction of the paddle blades in the central blending component is opposite to the inclination direction of the paddle blades in the silo wall blending component.

[0019] In an alternative embodiment:

[0020] The central blending component is a multi-layer paddle blade structure, and the paddle blades in the same layer are arranged symmetrically about the central axis, and adjacent layers of paddle blades are arranged in a staggered manner in the vertical direction;

[0021] The silo wall blending component is a layered paddle blade structure, and each layer of paddle blades is arranged at intervals along the circumferential direction of the inner wall of the silo body.

[0022] Beneficial effects: The material enters the silo under the action of gravity. The material entering the central area comes into contact with the multi-layer paddle blade structure of the central blending component. The paddle blades in the same layer are arranged symmetrically about the central axis. Under the action of these paddle blades, the material is guided to move in a circular motion around the central axis and move downward. Since adjacent layers of paddle blades are arranged in a staggered manner in the vertical direction, when the material passes through different layers of paddle blades, the movement trajectory continuously changes, further enhancing the agitation effect in the central area.

[0023] In an alternative embodiment, two to eight of the paddle blades are arranged in each layer, and the interval between each layer of paddle blades is the radius of the silo body.

[0024] In an alternative embodiment, the connection between the paddle blade and the central axis and the inner wall of the silo body uses an arc transition, and the arc radius is greater than or equal to 10 times the diameter of the material particles.

[0025] Beneficial effects: The material moves downward towards the lower part of the silo body under the action of gravity and will come into contact with the paddle blades during this process. When the material passes through the connection between the paddle blade and the central axis and the inner wall of the silo body, since the connection uses an arc transition design with an arc radius greater than or equal to 10 times the diameter of the material particles, the material can move forward smoothly along the movement trajectory of the paddle blade. The material will not be blocked by the sharp edges and corners at the connection, but under the push of the paddle blade, it continuously maintains a relatively stable flow state and moves towards the lower opening of the silo.

[0026] In an alternative embodiment:

[0027] The central mixing component has a multi-layer spiral structure. The spiral plates in the same layer are arranged symmetrically about the central axis, and adjacent layers of spiral plates are arranged with a vertical offset;

[0028] The bin wall mixing component has a layered spiral structure, and each layer of spiral plates is arranged at intervals along the circumferential direction of the inner wall of the bin body.

[0029] Beneficial effects: Materials enter the bin under the action of gravity. The materials entering the central area come into contact with the multi-layer spiral structure of the central mixing component. The spiral plates in the same layer are arranged symmetrically about the central axis. Under the action of these spiral plates, the materials are guided to move in a circular motion around the central axis and move downward. Since adjacent layers of spiral plates are arranged with a vertical offset, when the materials pass through different layers of spiral plates, the movement trajectories are continuously changed, further enhancing the stirring effect in the central area.

[0030] In an optional embodiment, two to eight spiral plates are arranged in each layer, and the interval between each layer of spiral plates is the radius of the bin body. Description of the Drawings

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Structural schematic diagram of a gravity mixing bin according to Embodiment 1 of the present invention;

[0033] Figure 2 Top view of a gravity mixing bin according to Embodiment 1 of the present invention;

[0034] Figure 3 Structural schematic diagram of a gravity mixing bin according to Embodiment 2 of the present invention;

[0035] Figure 4 Top view of a gravity mixing bin according to Embodiment 2 of the present invention.

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Bin body; 2. Central axis; 3. Double spiral structure; 4. Bin wall spiral structure; 5. Blade. Specific embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] The gravity blending bin is a solid bin that uses the gravity of materials for mixing, and is widely used in industries such as chemical engineering, plastics, and food, mainly for storing and mixing solid particles or powdered materials. The gravity blending bin realizes the mixing of materials in different batches or with different properties by setting a blending device inside the bin and using the natural flow of materials during the discharging process, so that the physical property parameters such as density, particle size, water content, and melt index change reach uniformity and stability. The gravity blending bin relies entirely on the gravity of materials for mixing, without additional power devices, which is energy-saving and has low operating costs. The mixing efficiency can reach more than 90%, and the mixing effect is stable.

[0040] The previous gravity blending bins are mainly divided into three types: central tube type, multi-tube type, or wall-attached mixing tube type. The central tube type only has a large-diameter pipe set in the center of the bin, with few flow channels and poor blending effect; the multi-tube type has a small pipe diameter and is prone to adhesion and blockage when encountering sticky materials; when the wall-attached mixing tube type encounters sticky and elastic materials, due to the small diameter of the mixing tube and the small included angle between the partitions in the mixing tube, it is easy to block and not easy to clean.

[0041] In the case of EPOE in the blending bin, when using the traditional wall-attached tube type blending bin, the diameter of the blending tube is small, and the cross-sectional area of the blending working chamber is small. A large number of EPOE particles entering the blending tube are prone to particle accumulation. Under the action of gravity, the EPOE particles are squeezed and deformed, and due to their own viscosity, they are extremely easy to adhere to the inner wall of the blending tube, forming a bridge, causing more particle accumulation and making the bridge more serious, affecting the blending effect.

[0042] Therefore, this embodiment provides a gravity blending bin to solve the above problems.

[0043] Embodiment 1

[0044] The following combines Figures 1 to 2 , to describe the embodiments of the present invention.

[0045] According to an embodiment of the present invention, a gravity blending bin is provided, which includes a bin main body 1, at least one set of central blending components, and at least one set of bin wall blending components. A central shaft 2 is provided inside the bin main body 1; the central blending components are fixed on the central shaft 2; the central blending components are configured to force the materials around the central blending components to move along a first direction towards the lower opening of the bin main body 1; the bin wall blending components are fixed on the inner wall of the bin; the bin wall blending components are configured to force the materials around the bin wall blending components to move along a second direction towards the lower opening of the bin main body 1; wherein, the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point.

[0046] In this embodiment, the gravity blending bin is used for EPOE particles. During use, the EPOE particles fall in the bin main body 1 by their own gravity. After contacting the central blending components, they move along the trajectory set by the central blending components and move along the first direction towards the lower opening of the bin main body 1 under the guidance of gravity and the component structure. At the same time, part of the materials contact the bin wall blending components under the action of gravity and move towards the lower opening of the bin main body 1 along the second direction under the influence of its structure. Since the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point, they constantly interweave and collide during the downward movement. The reverse material flow enables the materials at different positions to fully contact and mix, effectively improving the blending uniformity of the materials, making the physical property parameters of the mixed materials, such as density, particle size, etc., more stable and consistent, and better meeting the production requirements for the mixing quality of the materials. During the reverse flow of the materials, due to the absence of pipeline restrictions, the materials are not easily accumulated in local areas of the bin, reducing the blockage caused by material aggregation, ensuring that the bin can operate continuously and stably, guaranteeing the smoothness of the production process, and improving production efficiency.

[0047] In one embodiment, the bin main body 1 serves as the basic load-bearing structure of the entire blending system. The bin main body 1 is made of a high-strength, wear-resistant and corrosion-resistant metal material, such as stainless steel. Its shape is designed as a combination of an upper cylinder and a lower cone. The cylinder part can provide sufficient material storage space, and the cone part is conducive to the smooth flow of materials towards the bottom opening under the action of gravity, effectively avoiding the accumulation and residue of materials in the bin.

[0048] In one embodiment, as Figure 1 shown, both the central blending components and the bin wall blending components are spiral structures, and their spiral directions are opposite.

[0049] In the above embodiments, the material enters the silo under the action of gravity. During the falling process, the material near the position of the central axis 2 comes into contact with the spiral structure of the central blending component. Under the spiral guidance, along the direction set by the central spiral (assuming the central spiral is clockwise), it moves obliquely downward and rotates around the central axis 2 towards the lower opening of the silo body 1; while the material near the inner wall of the silo comes into contact with the spiral structure of the wall blending component. Since the spiral direction of the wall is opposite to that of the central spiral (i.e., counterclockwise), these materials also move obliquely downward and rotate around the inner wall of the silo along the wall spiral towards the lower opening of the silo body 1. During this process, the moving directions of the two parts of the material form a reverse direction, constantly interpenetrating and colliding with each other.

[0050] In one embodiment, the central blending component is a double - spiral structure 3, the spiral diameter is less than or equal to 1 / 4 of the diameter of the silo body 1, and the pitch is equal to the spiral diameter; the wall blending component is four groups of wall spiral structures 4, and the four groups of wall spiral structures 4 are evenly distributed along the circumferential direction of the inner wall of the silo at intervals of 90°.

[0051] In the above embodiments, the material enters the silo body 1 under the action of gravity. The material located in the central area of the silo comes into contact with the double - spiral structure 3 of the central blending component. Since the double - spiral diameter is less than or equal to 1 / 4 of the diameter of the silo body 1, and the pitch is equal to the spiral diameter, the material moves spirally downward around the central axis 2 at a stable spacing and a specific inclination angle under the guidance of the double - spiral, and is conveyed towards the lower opening of the silo body 1. At the same time, the material near the inner wall of the silo comes into contact with the four groups of wall spiral structures 4 evenly distributed along the circumferential direction of the inner wall of the silo at intervals of 90°. These materials move towards the lower opening of the silo body 1 under the guidance of their respective corresponding wall spirals. Because the central double - spiral and the wall spiral rotate in opposite directions on the horizontal plane when guiding the movement of the material (if the central double - spiral rotates clockwise, the wall spiral rotates counterclockwise, and vice versa), the materials in the central area and the area near the wall form a reverse material flow during the downward movement process, interweaving and colliding with each other.

[0052] In the above embodiments, the four groups of wall spirals are evenly distributed along the circumferential direction of the inner wall of the silo, which can make the material near the wall flow downward evenly, avoiding local accumulation of the material on the wall. At the same time, the reverse material flow enhances the overall fluidity of the material, reduces the possibility of material caking, bridging and blocking, ensures the continuous and stable operation of the silo, and improves production efficiency.

[0053] In one embodiment, the pitch of the central double - spiral and the wall spiral is equal to the spiral diameter. This design provides a stable conveying rhythm for the material, while ensuring the blending effect, enables the material to be efficiently conveyed towards the lower opening of the silo, reduces the residence time of the material in the silo, and further improves production efficiency.

[0054] In one embodiment, the connection between the spiral structure and the central axis 2 and the inner wall of the silo body 1 adopts an arc transition, and the radius of the arc is greater than or equal to 10 times the diameter of the material particles.

[0055] In the above embodiment, under the action of gravity, the material moves along the spiral structures of the central mixing component and the silo wall mixing component towards the lower opening of the silo body 1. During the movement, the material passes through the connection between the spiral structure and the central axis 2 and the inner wall of the silo body 1. Since the connection adopts an arc transition design with a radius of the arc greater than or equal to 10 times the diameter of the material particles and is polished smoothly, when the material passes through here, it will not be blocked by sharp corners and can move smoothly along the spiral trajectory, maintaining a relatively stable flow state and continuously moving towards the discharge port.

[0056] Embodiment 2

[0057] The following combines Figures 3 to 4 , to describe the embodiments of the present invention.

[0058] According to an embodiment of the present invention, a gravity mixing silo is provided, which includes a silo body 1, at least one set of central mixing components, and at least one set of silo wall mixing components. A central axis 2 is provided inside the silo body 1; the central mixing components are fixed on the central axis 2; the central mixing components are configured to force the material around the central mixing components to move along a first direction towards the lower opening of the silo body 1; the silo wall mixing components are fixed on the inner wall of the silo; the silo wall mixing components are configured to force the material around the silo wall mixing components to move along a second direction towards the lower opening of the silo body 1; wherein, the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point.

[0059] The gravity mixing silo in this embodiment is used for EPOE particles. During use, the EPOE particles fall in the silo body 1 by their own gravity. After contacting the central mixing components, along the trajectory set by the central mixing components, under the action of gravity and the guidance of the component structure, they move along the first direction towards the lower opening of the silo body 1. At the same time, part of the material contacts the silo wall mixing components under the action of gravity and moves towards the lower opening of the silo body 1 along the second direction under the influence of its structure. Since the material flow in the first direction and the material flow in the second direction are countercurrents to each other at the contact point, they continuously intertwine and collide during the downward movement. The reverse material flow enables the materials at different positions to come into full contact and mixing, effectively improving the mixing uniformity of the materials and making the physical property parameters of the mixed materials, such as density, particle size, etc., more stable and consistent, and better meeting the production requirements for the mixing quality of the materials. During the reverse flow of the materials, due to the absence of pipeline restrictions, the materials are not easily piled up in local areas of the silo, reducing the blockage caused by material aggregation, ensuring that the silo can operate continuously and stably, guaranteeing the smoothness of the production process, and improving production efficiency.

[0060] In one embodiment, both the central blending component and the bin wall blending component are paddle structures, and the inclination directions of the paddles 5 in the central blending component are opposite to those of the paddles 5 in the bin wall blending component.

[0061] In the above embodiment, the material enters the bin body 1 under the action of gravity. When the material contacts the paddle 5 of the central blending component, affected by the inclination direction of the paddle 5, the material will move obliquely downward with a tendency of circumferential rotation along the direction guided by the paddle 5 and move towards the lower opening of the bin body 1. At the same time, the material near the inner wall of the bin contacts the paddle 5 of the bin wall blending component. Since the inclination direction of its paddle 5 is opposite to that of the paddle 5 of the central blending component, this part of the material will also move towards the lower opening of the bin body 1, but the movement direction and rotation tendency are opposite to those of the material in the central region. In this way, the two parts of the material form a reverse flow during the downward movement, colliding and intertwining with each other. The materials at the center and the bin wall form a reverse flow under the action of the paddles 5 with opposite inclination directions, enabling the materials at different positions to be fully mixed, effectively improving the uniformity of the materials, making the mixed materials more stable and uniform in physical property parameters, and meeting the requirements for the mixing quality of the materials in production. The reverse flow increases the fluidity of the materials, avoids the accumulation of materials in local areas of the bin, reduces the risks of material caking, bridging and blockage, ensures the continuous and stable operation of the bin, and improves production efficiency.

[0062] In one embodiment, the central blending component is a multi-layer paddle structure, the paddles 5 in the same layer are symmetrically arranged along the central axis 2, and the adjacent two layers of paddles 5 are arranged with a vertical offset; the bin wall blending component is a layered paddle structure, and each layer of paddles 5 is arranged at intervals along the circumferential direction of the inner wall of the bin body 1.

[0063] In the above embodiment, the material enters the bin under the action of gravity. The material entering the central region contacts the multi-layer paddle structure of the central blending component. The paddles 5 in the same layer are symmetrically arranged along the central axis 2. Under the action of these paddles 5, the material is guided to move in a circular motion around the central axis 2 and move downward. Since the adjacent two layers of paddles 5 are arranged with a vertical offset, when the material passes through different layers of paddles 5, the movement trajectory continuously changes, further enhancing the stirring effect in the central region.

[0064] The material near the inner wall of the bin contacts the layered paddle structure of the bin wall blending component. Each layer of paddles 5 is arranged at intervals along the circumferential direction of the inner wall of the bin body 1. These paddles 5 cause the material to move along the circumferential direction of the inner wall of the bin and be conveyed downward. The materials in the central region and the bin wall region have different movement directions and paths under the action of their respective paddles 5, intertwining and colliding with each other, and finally all move towards the lower opening of the bin body 1.

[0065] In one embodiment, two to eight paddles 5 are arranged in each layer, and the interval between each layer of paddles 5 is the radius of the bin body 1.

[0066] In one embodiment, the connection between the blade 5, the central shaft 2 and the inner wall of the bin body 1 adopts an arc transition, and the radius of the arc is greater than or equal to 10 times the diameter of the material particles.

[0067] In the above embodiment, the material moves downward along the bin body 1 under the action of gravity and will contact the blade 5 during this process. When the material passes through the connection between the blade 5, the central shaft 2 and the inner wall of the bin body 1, due to the arc transition design with a radius of the arc greater than or equal to 10 times the diameter of the material particles at the connection, the material can move forward more smoothly along the movement track of the blade 5. The material will not be blocked by the sharp corners at the connection, but under the push of the blade 5, it continuously maintains a relatively stable flow state and moves continuously towards the lower opening of the bin.

[0068] Embodiment 3

[0069] The difference between this embodiment and the above embodiment is as follows:

[0070] In this embodiment, the central mixing component is a multi-layer spiral structure, the spiral plates in the same layer are symmetrically arranged along the central shaft 2, and the adjacent two layers of spiral plates are arranged in a staggered manner in the vertical direction; the bin wall mixing component is a layered spiral structure, and each layer of spiral plates is arranged at intervals along the circumferential direction of the inner wall of the bin body 1.

[0071] Among them, the length of the spiral structure in this embodiment is 1 / 10 to 1 / 20 of the length of the spiral structure in Embodiment 1, that is, the overall spiral plate is changed to multiple layers of shorter spiral plates, and the spiral plates in the same layer are symmetrically arranged along the central shaft 2, and the adjacent two layers of spiral plates are arranged in a staggered manner in the vertical direction. Similarly, multiple layers of shorter spiral plates are also arranged on the upper part of the bin body 1.

[0072] The material enters the bin under the action of gravity. The material entering the central area contacts the multi-layer spiral structure of the central mixing component, and the spiral plates in the same layer are symmetrically arranged along the central shaft 2. Under the action of these spiral plates, the material is guided to move in a circular motion around the central shaft 2 and move downward. Since the adjacent two layers of spiral plates are arranged in a staggered manner in the vertical direction, when the material passes through different layers of spiral plates, the movement track continuously changes, further enhancing the stirring effect in the central area.

[0073] In one embodiment, two to eight spiral plates are arranged in each layer, and the interval between each layer of spiral plates is the radius of the bin body 1.

[0074] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gravity blending bin, characterized in that: include: A silo body (1), wherein a central axis (2) is provided inside the silo body (1); At least one set of central blending components is fixed on the central axis (2); the central blending components are configured to force the material around the central blending components to move along a first direction toward the lower opening of the silo body (1); At least one set of silo wall mixing components is fixed to the inner wall of the silo body (1); the silo wall mixing components are configured to force the material around the silo wall mixing components to move along a second direction toward the lower opening of the silo body (1); The material flow in the first direction and the material flow in the second direction are countercurrent to each other at the contact point.

2. The gravity blending bin according to claim 1, characterized in that: The central mixing component and the bin wall mixing component are both spiral structures, and the spiral directions of the two are opposite.

3. The gravity blending bin according to claim 2, characterized in that: The central mixing component is a double helix structure (3), the diameter of the helix is ​​less than or equal to 1 / 4 of the diameter of the silo body (1), and the pitch is equal to the helix diameter; The silo wall mixing components are four groups of silo wall spiral structures (4), and the four groups of silo wall spiral structures (4) are evenly distributed at intervals of 90 degrees along the circumferential direction of the inner wall of the silo.

4. The gravity blending bin according to claim 2 or 3, characterized in that: The connection between the spiral structure, the central axis (2) and the inner wall of the silo body (1) adopts an arc transition, and the arc radius is greater than or equal to 10 times the diameter of the material particles.

5. The gravity blending bin according to claim 1, characterized in that: The central mixing component and the silo wall mixing component are both paddle structures, and the inclination direction of the paddles (5) in the central mixing component is opposite to the inclination direction of the paddles (5) in the silo wall mixing component.

6. The gravity blending bin according to claim 5, characterized in that: The central mixing component is a multi-layer blade structure, the blades (5) in the same layer are symmetrically arranged along the central axis (2), and the blades (5) of two adjacent layers are staggered in the vertical direction; The silo wall mixing assembly is a layered blade structure, and each layer of blades (5) is arranged at intervals along the circumferential direction of the inner wall of the silo body (1).

7. The gravity blending bin according to claim 6, characterized in that: Two to eight blades (5) are arranged in each layer, and the interval between the blades (5) in each layer is the radius of the silo body (1).

8. The gravity blending bin according to any one of claims 5 to 7, characterized in that: The connection between the blade (5), the central axis (2) and the inner wall of the silo body (1) is in the form of an arc transition, and the radius of the arc is greater than or equal to 10 times the diameter of the material particles.

9. The gravity blending bin according to claim 1, characterized in that: The central mixing component is a multi-layer spiral structure, the spiral plates in the same layer are symmetrically arranged along the central axis (2), and the spiral plates of two adjacent layers are staggered in the vertical direction; The silo wall mixing assembly is a layered spiral structure, and each layer of spiral plates is arranged at intervals along the circumferential direction of the inner wall of the silo body (1).

10. The gravity blending bin according to claim 9, characterized in that: Two to eight spiral plates are arranged in each layer, and the interval between the spiral plates in each layer is the radius of the silo body (1).

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