A drum structure of a double-reflow drum mixer

Abstract

The application discloses a kind of double reflux mixers's roller structure, including roller, the roller horizontal setting, the roller includes inner cylinder and outer cylinder, the outer cylinder is set the outside of inner cylinder, the outer cylinder and inner cylinder between being equipped with cavity, the cavity is equipped with the passageway with the inner cavity of inner cylinder, the first push device is equipped in the inner cavity, the second push device is equipped in the cavity, so that material moves in axial direction, the first push device at least includes part with the helical direction opposite of second push device spiral belt, so that the material forms circular motion between inner cavity and cavity.This application sets up inner cylinder and outer cylinder, and the through hole is arranged between inner cylinder and outer cylinder, material can enter the cavity of outer cylinder from the inner cavity of inner cylinder through the through hole, and at least a part of helical direction opposite spiral belt is arranged in the inner cavity and the cavity, so that the material forms opposite direction movement in axial direction during mixing, and forms circulation through the through hole, so that the mixer mixes more fully.

Description

Technical Field

[0001] This invention relates to the field of horizontal drum mixer technology, and more particularly to the drum structure of a horizontal drum mixer. Background Technology

[0002] A mixer is used to uniformly mix two or more materials. It typically includes a tank and a stirring device. In a horizontal ribbon mixer, the stirring device consists of two ribbons with opposite helical directions. During mixing, the material inside the mixer experiences a combined motion from the two ribbons moving in opposite directions, causing the material to rotate clockwise and counterclockwise along the inner wall. The material near the axis rotates around the axis, pushing axially from the inside to the sides. The outer spiral drives the material near the cylinder wall to rotate around the axis, pushing axially from the sides to the inside. This creates convection circulation and shear mixing within the cylinder, achieving rapid and uniform mixing of the materials in a short time. For example, Chinese invention patent CN114849550A discloses a multi-functional drum mixer. This invention aims to provide a mixer with better mixing performance. Summary of the Invention

[0003] The purpose of this invention is to provide a horizontal ribbon mixer with better mixing effect, which further improves the mixing effect by setting an inner and outer cylinder to form a double circulation structure.

[0004] Therefore, the present invention provides a drum structure for a double-recirculation drum mixer, comprising a drum arranged horizontally, the drum including an inner cylinder and an outer cylinder, the outer cylinder being disposed outside the inner cylinder, a cavity being provided between the outer cylinder and the inner cylinder, a communicating channel being provided between the cavity and the inner cavity of the inner cylinder, a first pushing device being provided in the inner cavity, and a second pushing device being provided in the cavity, causing the material to move axially, the first pushing device including at least a portion of a spiral ribbon with a spiral direction opposite to that of the second pushing device, causing the material to form a cyclic motion between the inner cavity and the cavity.

[0005] Furthermore, the inner cylinder wall between the inner cavity and the container cavity serves as a partition layer, and each end of the partition layer is provided with several through holes penetrating the partition layer.

[0006] Furthermore, the first pushing device includes a first blade and a second blade. The first blade is located in the inner cavity near the axis, and the second blade is located in the inner cavity near the separator layer. The spiral direction of the first blade causes the material to move axially from the feed port to the discharge port when the drum rotates. The spiral direction of the second blade is opposite to that of the first blade, so that the material forms a first circulation in the inner cavity.

[0007] Furthermore, the second blade is fixed to or in contact with the partition layer, and there is a gap between the first blade and the second blade in the radial direction.

[0008] Furthermore, one end of the first blade is located at the feed inlet of the inner cylinder, and the other end of the first blade is located at a predetermined distance from the discharge outlet of the inner cylinder.

[0009] Furthermore, the second pushing device includes a third blade, which is fixed to the inner wall of the outer cylinder or the partition layer, and the helical direction of the third blade is the same as that of the second blade.

[0010] Furthermore, the second pushing device includes two third blades extending from both ends of the cavity toward the center of the cavity and with opposite spiral directions. The partition layer is provided with several through holes for material to pass through at the middle position of the two third blades.

[0011] The beneficial effects of this invention are as follows:

[0012] (1) This invention comprises an inner cylinder and an outer cylinder, with a through hole between them. Material can pass through the through hole from the inner cavity of the inner cylinder into the cavity of the outer cylinder. Spiral ribbons (first blade and third blade) with opposite spiral directions are arranged in the inner cavity and the outer cavity. The drum of this invention is a component of a mixer, suitable for batch mixing and continuous mixing. During mixing, the material undergoes multiple mixing actions. (See reference...) Figure 4 As shown, firstly, the rotation of the drum causes the material to tumble in both the container cavity and the inner cavity, generating strong longitudinal shear mixing (mixing trajectory 1); secondly, because the inner cavity is equipped with first and second blades with opposite spiral directions, the first and second blades will push the material to move in opposite directions in the horizontal direction during the rotation of the drum, specifically, it is a spiral movement mixing (participating in mixing trajectories 2 and 3), which, combined with longitudinal shear mixing, forms a complex mixing motion, forming a small circulation in the inner cavity; thirdly, the material enters the container cavity through the through hole, and the third blade pushes the material to mix longitudinally and laterally in the container cavity, forming a large circulation with the small circulation in the inner cavity, thereby achieving rapid and uniform mixing of the material through internal and external dual circulation.

[0013] (2) The present invention can be used for continuous mixing of materials. First, sufficient material is input into the inner cavity for thorough mixing. Then, the corresponding type of material is continuously injected into the mixing cavity in a certain proportion. The first blade pushes the material laterally to two-thirds of the position in the mixing cavity. Then, the second blade pushes the material back to the feed port in the opposite direction. This can prevent the material entering the mixing cavity from being discharged directly from the discharge port without being fully stirred. Attached Figure Description

[0014] Figure 1 A top view diagram illustrating a specific embodiment of the present invention;

[0015] Figure 2 for Figure 1 A cross-sectional view;

[0016] Figure 3 Schematic diagram of the cross-section of the inner cylinder

[0017] Figure 4 This is a schematic diagram of the mixing trajectory of the inner cylinder.

[0018] Explanation of reference numerals in the attached drawings: 1. Drum; 2. Inner cylinder; 201. Inner cavity; 202. Separating layer; 203. Through hole; 3. Outer cylinder; 301. Receptacle; 4. First pushing device; 401. First blade; 402. Second blade; 403. Fixed column; 5. Second pushing device; 501. Third blade; 6. Feed inlet; 7. Discharge outlet. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving the intended utility model objective, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] Reference Figure 1 and Figure 2As shown, the drum structure of a double-recirculation drum mixer of the present invention includes a drum 1, which includes an inner drum 2 and an outer drum 3. The outer drum 3 is disposed outside the inner drum 2. A cavity 301 is provided between the outer drum 3 and the inner drum 2. A through hole 203 is provided between the cavity 301 and the inner cavity 201 of the inner drum 2. A first pushing device 4 is provided in the inner cavity 201, and a second pushing device 5 is provided in the cavity 301, so that the material moves axially in the cavity and the inner cavity. The first pushing device 4 includes a spiral ribbon with a spiral direction opposite to that of the second pushing device 5, so that the material forms a cyclic motion between the inner cavity 201 and the cavity 301. In this embodiment, the drum 1 is horizontally arranged. One end of the drum 1 is provided with a sprocket that cooperates with a transmission chain, and the other end is provided with a load-bearing wheel and an auxiliary wheel. Both ends of the drum are provided with covers. A flange plate is provided at the end of the cover facing the drum body. The inner drum and the outer drum are respectively detachably fixed to the flange plate by bolts and nuts. The inner cylinder 2's wall serves as a partition layer 202, separating the nacelle and the inner cavity. Each end of the partition layer 202 has several through holes 203 penetrating it. The inner cavity 201 of the inner cylinder 2 contains a first pushing device 4, including a first blade 401 and a second blade 402. The first blade 401, second blade 402, and third blade 501 are also called a spiral ribbon, a type of helical metal sheet. The first blade 401 is located in the inner cavity 201 near the axis, and the second blade 402 is located in the inner cavity 201 near the partition layer 202. The spiral direction of the second blade 402 is opposite to that of the first blade 401. The second blade 402 is fixed to the inner wall of the inner cylinder. A fixed column 403 is provided on 402. At this time, there is a gap between the second blade 402 and the first blade 401. The first blade 401 is fixed on the fixed column 403. Of course, the fixed column 403 can also be fixed on the inner wall of the inner cylinder 2. The spiral direction of the first blade 401 causes the material to move axially from the feed port 6 to the discharge port 7 when the drum 1 rotates. The spiral direction of the second blade 402 is opposite to that of the first blade 401, so that the material moves in the opposite direction axially, forming a first cycle in the inner cavity 201. Preferably, the length of the second blade 402 is the same as or close to the length of the inner cavity, extending from one end of the cylinder to the other. The length of the first blade extends from one end of the feed inlet to a predetermined position of the cylinder length, which in this embodiment is about two-thirds of the cylinder length. The drum in this embodiment can be used for continuous mixing of materials. The length of the first blade is matched with the length of the second blade so that when the material in the upper layer (or near the axis) of the mixing chamber reaches two-thirds of the cylinder length, i.e., outside the range of the first blade, it loses the pushing force towards the discharge port. At the same time, due to the reverse pushing action of the second blade 402, the material in the upper layer falls into the lower layer and is pushed back to the feed inlet by the second blade 402, thereby avoiding the material entering the mixing chamber from being discharged directly without being fully mixed during the continuous mixing process.The through holes on the partition layers at both ends of the inner cylinder 2 allow the material to enter the cavity from the through hole near the discharge port or from the through hole near the feed port. The material undergoes a complex mixed motion in the cavity, combining longitudinal shearing and transverse spiral motion, and combines with the first cycle of the inner cavity to form a second cycle of the large cycle.

[0021] In the above embodiments, reference is made to Figure 2 As shown, the second pushing device 5 includes a third blade 501, which is fixed to the inner wall of the outer cylinder 3 or the partition layer 202. The spiral direction of the third blade 501 is the same as that of the second blade 402. The third blade 501 is used to cooperate with the inner cylinder to form a second cycle for rapid mixing.

[0022] In the above embodiments, there are four first blades 401, four second blades 402, and four third blades 501, which are distributed at equal intervals on the concentric circles of the inner cylinder and on the circumference of the inner and outer cylinders.

[0023] In the above embodiments, reference is made to Figure 3 As shown, the angle between the tangent of the second blade 403 on the cross-section of the inner cylinder 2 and the tangent of the inner cylinder 2 is an acute angle. The advantage of this structure is the simplicity of fixing the blades to the cylinder. Since no partition is provided between the first blade 401 and the second blade 402 in this embodiment, the material can move longitudinally within the effective range of the first blade 401 and the second blade 402 during the rotation of the drum. Although it is difficult to completely avoid longitudinal movement of the material in this embodiment, the amount of longitudinal movement can be reduced, allowing the material to mix and spiral within the track formed by the second blade 402 as much as possible. Preferably, a partition is provided between the outer edges of adjacent first blades 401 or between the inner edges of adjacent second blades 402. The partition is preferably spiral-shaped, separating the effective ranges of the first blades 401 and the second blades 402 to prevent material mixing during the rotation of the drum 1. The disadvantage of this preferred embodiment is that the spiral partition is difficult and costly to manufacture using traditional processing methods.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drum structure of a double-reflux drum mixer, comprising a drum, the drum being horizontally disposed, characterized in that: The drum comprises an inner drum and an outer drum, the outer drum is arranged outside the inner drum, a cavity is arranged between the outer drum and the inner drum, a channel is arranged between the cavity and the inner chamber of the inner drum, a first pushing device is arranged in the inner chamber, and a second pushing device is arranged in the cavity, so that the material moves in the axial direction with the rotation of the drum, the first pushing device comprises at least a spiral belt with a spiral direction opposite to that of the second pushing device, so that the material forms a circulating motion between the inner chamber and the cavity; The drum wall of the inner drum between the inner chamber and the cavity serves as a separation layer, and a plurality of through holes penetrating the separation layer are arranged at both ends of the separation layer; The first pushing device comprises a first paddle and a second paddle arranged in a spiral, the first paddle is arranged in the inner chamber close to the shaft center, and the second paddle is arranged in the inner chamber close to the separation layer, the spiral direction of the first paddle makes the material move in the axial direction from the feeding port to the discharging port when the drum rotates, and the spiral direction of the second paddle is opposite to that of the first paddle, so that the material forms a first circulation in the inner chamber; The second pushing device comprises a third paddle, the third paddle is fixed on the inner wall of the outer drum or the separation layer, and the spiral direction of the third paddle is the same as that of the second paddle.

2. A double back flow drum mixer according to claim 1, characterized in that: The second paddle is fixed on the separation layer or in contact with the separation layer, and the first paddle has a gap in the radial direction with the second paddle.

3. A double back flow drum mixer according to claim 2, wherein: One end of the first paddle is arranged at one end of the feeding port of the inner drum, and the other end of the first paddle is arranged at a predetermined distance from one end of the discharging port of the inner drum.

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