Dry and wet material mixing equipment and dry and wet material mixing method

Abstract

The invention relates to a heating cigarette dry and wet material mixing device which is used for mixing a tobacco dry material and a tobacco wet material to form a mixed material and comprises a tank body used for containing the mixed material; the stirring mechanism is used for stirring the mixed materials in the tank body; the cutter is used for cutting the mixed material in the tank body in a stirring state; and the cold air system is used for introducing cold air into the tank body so as to cool the materials in the tank body. The invention also provides a mixing method for heating the dry and wet materials of the cigarettes, specifically, the dry and wet materials are fed, the materials are cut in a stirring state, and the materials are cooled, so that the phenomenon of dense particles caused by mechanical movement of the particles in the granulation process can be reduced, the particles have more sufficient time to be crushed and repolymerized in the mixer, and the quality of the particles is improved. And the mixing uniformity is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing, and particularly relates to a dry and wet material mixing device and a dry and wet material mixing method in the process of preparing a novel tobacco product. Background Art

[0002] Heated cigarettes, also known as heat-not-burn cigarettes, are a new type of tobacco product with the following technical features: tobacco is used as the main raw material, and an atomizer (usually glycerin and propylene glycol) is mixed into it to form a smoke-generating body; the smoke-generating body is inserted into an external heating source for heating to generate smoke for consumers to inhale. In the production of heated cigarette sheets, a higher proportion of wet materials is often required to increase the proportion of atomizers and increase the smoke production of cigarettes; in order to pursue relatively high sheet strength, more adhesives need to be added. Reconstituted tobacco leaves are one of the important materials for manufacturing heated cigarette smoke-generating bodies. The main manufacturing methods are rolling method, thick pulp method and papermaking method.

[0003] Rolled thin sheets, also known as rolled reconstituted tobacco leaves, are one of the main production processes for reconstituted tobacco leaves. Their technical characteristics are as follows: after the tobacco powder raw materials are fully mixed with various additives and adhesives, they are rolled through multiple rollers to form a continuous thin sheet with a thickness of about 0.1mm to 0.3mm. The thin sheets are then dried and cut into shreds to form rolled thin sheets with a length of about 3mm to 5mm and a width of about 0.8mm to 1.2mm. The formed thin sheets can be used as an admixture in the tobacco formula in traditional cigarettes to reduce costs; if a large amount of atomizer is added during the production of rolled thin sheets, the formed thin sheets can be used as the main raw material for the smoke body of heated cigarettes. In the production of heated cigarette thin sheets, a higher proportion of wet materials is often required to increase the proportion of atomizers and increase the smoke yield of cigarettes; in order to pursue a relatively high sheet strength, more adhesives need to be added.

[0004] Compared with traditional cigarettes that use roll-pressed thin flakes as blending products, heated cigarettes use thin flakes as the main formula raw materials, which require higher uniformity of thin flake products. In the production of roll-pressed thin flakes, dry-wet mixing is a key process that affects product uniformity. Whether the raw and auxiliary materials are mixed evenly not only affects the uniformity of the product formula, but also has an important impact on the continuity, stability and quality of the downstream rolling process. Uneven dry-wet mixing can easily lead to cracking, voids, uneven thickness, and flowery flakes in the thin flakes during the calendering process.

[0005] The dry-wet mixing process of traditional roller-pressed flake production is usually equipped with a vertical intensive mixer, which uses multiple cutting knives to perform high-speed horizontal shearing of the dry and wet materials in the tank to form granular materials, which are then fed into the discharge screw through the discharge port at the bottom of the intensive mixer and supplied to the calender. When the proportion of wet materials in the flake formula is too high, large lumps of materials will appear in the vertical intensive mixer for a short mixing time, causing the mixer to shake violently and the current of the stirring motor to increase. The mixing cannot be carried out for a long time, and the large lumps of materials after mixing cannot be discharged normally through the discharge port. Even if the materials can be discharged, the overly large particles of materials are more likely to form arches and bridges in the feeding bin of the roller press, affecting the continuity and stability of the roller press feeding. In order to solve the problem of oversized particles during the mixing and granulation process, the commonly used high-speed shear wet granulator is generally equipped with an additional high-speed cutting knife on the side wall of the mixing tank to break up the large particles, thereby limiting the generation of lumps of material and further improving the mixing uniformity. However, in the case of excessively high proportions of wet materials and adhesives, it is impossible to stir and mix for a long time, and it is impossible to effectively avoid excessive growth and lumps of material particles. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of uneven mixing of dry and wet materials, rapid agglomeration of material particles, and excessively large particles of mixed materials when a large proportion of atomizer and adhesive are added during the preparation of heated cigarettes. The present invention provides a mixing device for dry and wet materials, which can reduce the growth rate of particles, prolong the mixing time of dry and wet materials, and improve the uniformity of mixing.

[0007] To solve the above technical problems, an embodiment of the present invention discloses a device for mixing dry and wet materials in a process of preparing heated cigarettes, wherein the device is used to mix tobacco dry material and wet material to form a mixed material, and comprises: a tank body, used to contain the mixed material; a stirring mechanism, used to stir the mixed material in the tank body; a cutter, used to cut the mixed material in the tank body under stirring; and a cold air system, used to introduce cold air into the tank body to cool the material in the tank body.

[0008] The above technical solution can improve the uniformity of dry-wet mixing in the production of reconstituted tobacco leaves, and reduce the phenomenon that the mixed material particles are too large or even clumping and the particles grow too fast due to the large proportion of atomizers and adhesives added. When the product formula requires a high proportion of wet materials, the present invention combines stirring and cutting, and introduces cold air during the mixing process to reduce the compaction effect of the particles and reduce the growth rate of the particles, so as to extend the mixing time of dry and wet materials and improve the mixing uniformity.

[0009] Optionally, the stirring mechanism includes a stirring blade and a stirring shaft, wherein the stirring shaft is located at the center of the tank body and is vertically arranged, and the stirring blade is located at the bottom of the tank body and rotates around the stirring shaft.

[0010] Optionally, a surface that is colinear with the axis of the stirring blade and perpendicular to the bottom of the tank is defined as a vertical surface, the rotation direction of the stirring blade is the stirring direction, the surface where the stirring blade is located is an inclined surface relative to the vertical surface, and the upper edge of the stirring blade is inclined away from the stirring direction, and the angle between the inclined surface and the vertical surface is 30-60 degrees.

[0011] Optionally, the distance between the lower edge of the stirring blade and the bottom surface of the tank body is 1-2 mm.

[0012] Optionally, the cutter includes a rotating shaft and a cutting knife, wherein the cutting knife is multiple and extends from a peripheral wall of the rotating shaft in a direction away from the rotating shaft, and the cutting knife is distributed at intervals along the circumference and axial direction of the rotating shaft.

[0013] Optionally, the cutting knife is double-edged.

[0014] Optionally, the rotating shaft extends from a side surface of the tank body and extends along a cross section parallel to the tank body.

[0015] Optionally, the rotating shaft extends from the side of the tank body to the cross-sectional center of the tank body, and the ratio of the extending length to the length of the extension port from the cross-sectional center of the tank body is 2 / 3-3 / 4, and the extension port is the position where the rotating shaft intersects the side of the tank body.

[0016] Optionally, the bottom surface of the tank body is low in the middle and high around.

[0017] Optionally, the bottom surface of the tank body is bowl-shaped or cone-shaped.

[0018] Optionally, the dry and wet material mixing equipment further comprises a wet material spray head for spraying the wet material into the tank body.

[0019] Optionally, the dry and wet material mixing equipment also includes a wet material nozzle located upstream of the rotating shaft, the projection of the wet material nozzle on the cross section of the tank body is defined as the wet material nozzle projection, the projection of the rotating shaft on the cross section of the tank body is defined as the rotating shaft projection, the angle between the wet material nozzle projection and the center line of the cross section of the tank body and the rotating shaft projection is 30-60 degrees, and the upstream is the position that the stirring mechanism sweeps first when it rotates.

[0020] Optionally, the cold air system includes a cold air head, the cold air head has an air outlet, and the air outlet is a slit type.

[0021] Optionally, the longitudinal section of the cold air head is fan-shaped or trapezoidal.

[0022] Optionally, the air outlet is annular, and the extension trend of the ring matches the trajectory of the circular motion part of the material during the stirring process.

[0023] Optionally, the ratio of the effective mixing volume of the tank to the volume of the added material is 10:4-10:2.

[0024] Optionally, the dry and wet material mixing equipment includes a dust-proof component placed on the top of the tank body, which is used to collect dry material escaping from the tank body.

[0025] Optionally, the dust-proof component includes a dust bag and a hollow support column, the bottom of the support column is connected to the tank body, the top of the support column has a sealing cover, the side wall of the support column is provided with a plurality of through holes, the dust bag is located inside the support column, and the opening of the dust bag is connected to the bottom of the support column.

[0026] Optionally, a discharge port is opened on the side wall of the tank body, and the dry and wet material mixing equipment also includes a discharge mechanism located on the side wall of the tank body, the discharge mechanism includes a horizontal pipe connected to the discharge port, a baffle located in the horizontal pipe, and a driving mechanism, a drop port is provided at the bottom of the horizontal pipe, and the driving mechanism is used to drive the baffle to move toward and away from the discharge port to close and open the discharge port.

[0027] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a cold air outlet, the cross section of the cold air outlet is a slit type, and the longitudinal section of the air outlet of the cold air head is a fan-shaped or trapezoidal shape.

[0028] By adopting the above technical solution, the sweeping range of the air outlet can be increased while ensuring the air outlet force, thereby improving the cooling effect.

[0029] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a layout relationship between a wet material nozzle and a cutter, the dry and wet material mixing equipment also includes a wet material nozzle located upstream of the rotating shaft, the projection of the wet material nozzle on the cross section of the tank body is defined as the wet material nozzle projection, the projection of the rotating shaft on the cross section of the tank body is defined as the rotating shaft projection, the angle between the center line of the wet material nozzle projection and the cross section of the tank body and the rotating shaft projection is 30-60 degrees, and the upstream is the position that the stirring mechanism first sweeps when it rotates.

[0030] By adopting the above technical solution, the effect of quickly cutting the dry material and the wet material after mixing can be achieved, and the material particles can be prevented from clumping together.

[0031] An embodiment of the present invention also discloses a method for mixing dry and wet materials, which uses the above-mentioned dry and wet material mixing equipment and includes the following steps: adding dry material and wet material into the tank body, stirring and mixing to form a mixed material; cutting the mixed material in the tank body under stirring; and introducing cold air into the tank body to cool the material in the tank body.

[0032] By adopting the above technical solution, the growth rate of particles can be slowed down, so that the particles have more time to be broken and reassembled in the mixer, thereby improving the mixing uniformity.

[0033] Optionally, in the above-mentioned mixing method, after the wet materials are added, cold air is introduced into the tank body through the cold air system.

[0034] Optionally, in the above-mentioned mixing method, the stirring mechanism includes a stirring blade and a stirring shaft, the stirring shaft is located at the center of the tank body and is vertically arranged, the stirring blade is located at the bottom of the tank body and rotates around the stirring shaft, and the rotation rate of the stirring blade is 100-300r / min.

[0035] Optionally, in the above-mentioned mixing method, the cutter includes a rotating shaft and cutting knives, and the cutting knives are multiple and extend from the peripheral wall of the rotating shaft in a direction away from the rotating shaft. The cutting knives are respectively distributed at intervals along the circumference and axial direction of the rotating shaft, and the rotation rate of the rotating shaft is 1000-3000r / min.

[0036] Optionally, in the above-mentioned mixing method, the direction in which the stirring mechanism drives the material to move toward the cutter is defined as the material advancement direction, and the direction in which the cutter cuts the material is defined as the cutting direction of the cutting knife. The mixing method includes: adding wet material, setting the material advancement direction to be opposite to the cutting direction trend of the cutting knife, and after the wet material is added, setting the material advancement direction to be the same as the cutting direction trend of the cutting knife.

[0037] Optionally, in the above-mentioned mixing method, the angle between the air outlet direction of the cold air system and the cross section of the tank body is 45-60 degrees.

[0038] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a mixing method, wherein the rotation rate of the stirring blade is 100-300 r / min, and the rotation rate of the rotating shaft of the cutter is 1000-3000 r / min at this stirring rate. Further, the rotation rate of the stirring blade is 220 r / min, and the rotation rate of the rotating shaft of the cutter is 1200 r / min at this stirring rate.

[0039] By adopting the above technical solution, uniform mixing of materials can be achieved, and the materials can be prevented from growing too fast and the particles of the materials being too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A left side view of a schematic diagram of a dry and wet material mixing device according to an embodiment of the present invention is shown (the side wall of the tank is omitted);

[0041] Figure 2A bottom view showing a schematic diagram of a dry-wet material mixing device according to an embodiment of the present invention (the bottom of the tank and the bottom of the discharge mechanism are omitted);

[0042] Figure 3 A front view showing a schematic diagram of a dry-wet material mixing device according to an embodiment of the present invention (the side wall of the tank and the side wall of the discharge mechanism are omitted);

[0043] Figure 4 A top view showing a schematic diagram of a dry and wet material mixing device according to an embodiment of the present invention (the upper cover of the tank, the dry material inlet and the upper wall of the discharge mechanism are omitted);

[0044] Figure 5 A schematic diagram of a dry-wet material mixing device according to an embodiment of the present invention is shown;

[0045] Figure 6 A schematic diagram of a dry-wet material mixing device according to an embodiment of the present invention is shown (the tank side wall, upper cover and discharge mechanism are omitted);

[0046] Figure 7 A schematic diagram showing a cutter of a dry-wet material mixing device according to an embodiment of the present invention;

[0047] Fig. 8A A three-dimensional schematic diagram showing a cooling air system of a dry and wet material mixing device according to an embodiment of the present invention;

[0048] Figure 8B A schematic front view of a cooling air system of a dry-wet material mixing device according to an embodiment of the present invention is shown;

[0049] Figure 8C A bottom schematic diagram showing a cooling air system of a dry-wet material mixing device according to an embodiment of the present invention;

[0050] Fig.9A A schematic diagram showing the relative position relationship between the stirring blade and the stirring shaft of a dry-wet material mixing device according to an embodiment of the present invention;

[0051] Fig. 9B A schematic diagram showing the inclination relationship of the stirring blades of a dry-wet material mixing device according to an embodiment of the present invention;

[0052] Fig. 10A A schematic diagram showing the opposite relationship between the material advancing direction and the cutting direction of the cutting knife in one embodiment of the present invention;

[0053] Fig. 10B A schematic diagram showing the relationship between the material advancing direction and the cutting direction of the cutting knife in one embodiment of the present invention;

[0054] Fig.11 A schematic diagram showing the projection of a wet material spray head and a cutter on a tank cross section according to an embodiment of the present invention;

[0055] Fig.12 A schematic diagram showing the spatial position of a cold air head according to an embodiment of the present invention is shown;

[0056] Fig.13 A flow chart of a method for mixing dry and wet materials according to an embodiment of the present invention is shown.

[0057] (Explanation of symbols)

[0058] 1 tank

[0059] 2 Upper cover

[0060] 3. Mixing mechanism

[0061] 31 stirring blade

[0062] 32 stirring shaft

[0063] 4 Cutter

[0064] 41 cutting knife

[0065] 42 shafts

[0066] 5. Cooling system

[0067] 51 Cold air duct

[0068] 52 Cold Wind

[0069] 53 Cold air outlet

[0070] 6Dust removal parts

[0071] 61 support column

[0072] 62 dust bag

[0073] 63 blocks

[0074] 7 Bottom

[0075] 8. Discharge mechanism

[0076] 81 discharge port

[0077] 82 blanking port

[0078] 83 baffle

[0079] 84 cylinders

[0080] 85 connecting rod

[0081] 86 horizontal pipeline

[0082] 87 driving mechanism

[0083] 9Wet material spraying system

[0084] 91 Wet material pipeline

[0085] 92 wet material nozzle

[0086] 10Dry material inlet DETAILED DESCRIPTION

[0087] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0088] The term "reconstituted tobacco" is used herein to describe the regenerated product of tobacco material in the form of sheets or shreds during the cigarette manufacturing process, which is used as cigarette filler. The term "dry and wet material mixing equipment" is used herein to describe equipment used to mix dry tobacco material and wet tobacco material.

[0089] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0090] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0091] The present embodiment provides a dry-wet material mixing device, which is used to mix tobacco dry material and wet material to form a mixed material. The tobacco dry material is, for example, tobacco raw material powder, and the wet material includes, for example, an atomizer and a binder. The dry-wet material mixing device of the present embodiment is particularly suitable for mixing tobacco powder and wet material in the process of preparing reconstituted tobacco leaves.

[0092] like Figures 1 to 6 As shown, the dry-wet material mixing equipment of the above embodiment includes: a tank body 1, used to contain the mixed material; a stirring mechanism 3, used to stir the mixed material in the tank body 1; a cutter 4, used to cut the mixed material in the tank body 1 under stirring; a cold air system 5, used to introduce cold air into the tank body 1 to cool the material in the tank body 1.

[0093] The equipment in this embodiment adds dry material and wet material, wherein the wet material usually includes a large proportion of atomizer and adhesive to increase the smoke production and improve the strength of the reconstituted tobacco leaf sheet. The process of mixing dry material and wet material is similar to wet granulation. According to the particle formation mechanism of wet granulation, the aggregation between powders and the growth of particles are mainly bonded by the formation of liquid bridges between wet materials containing adhesives. After the particles are formed, on the one hand, with the increase of wet materials, the liquid of the particles gradually becomes saturated; on the other hand, as the particles continue to collide and squeeze under the action of mechanical force, the internal voids of the particles become smaller, and the liquid adhesive migrates to the surface of the particles. Both of the above situations will cause an increase in liquid on the surface of the particles, an increase in the number of connection points, and promote particle growth. After the dry and wet mixing, the roller-pressed thin sheet needs to be calendered multiple times, that is, in the dry and wet mixing process, there is no need to pursue the density of the particles. The most ideal is that after the dry and wet mixing, the material is in the form of fine sand particles. When the product formula requires a high proportion of wet material, the present invention reduces the compaction effect of the particles and reduces the growth rate of the particles. In this way, there will be no agglomeration problem even when the stirring time is long, thereby achieving the purpose of extending the mixing time of the dry and wet materials and further improving the mixing uniformity.

[0094] During the mixing process, shearing the mixed material with a cutter can break up large pieces of material and reduce the problem of lumps. In the field of tobacco processing, especially in the preparation process of reconstituted tobacco, the addition of atomizers and binders will cause the agglomeration problem of dry and wet materials when mixed more seriously. There will still be a lot of agglomerates when mixing only by shearing.

[0095] To this end, the equipment of the above embodiment stirs and cuts the dry and wet materials during the mixing process, cuts the agglomerated mixed materials, and introduces cold air to cool them down. On the one hand, cooling reduces the fluidity of the liquid material, reduces the volume of the surface liquid material, and makes it difficult for the particles to stick together. On the other hand, after cooling, the particles become hard, the deformation amount becomes smaller, the contact area is reduced, and it is not easy to stick together. It was found through testing that the agglomeration problem was significantly improved under the condition of cold air cooling.

[0096] The stirring mechanism may include a variable frequency drive motor, a reducer, a stirring shaft and a stirring blade; the stirring shaft extends from the top or bottom of the tank body into the tank body and is connected to the stirring blade, the lower edge of the stirring blade is close to the bottom of the tank body, and the stirring mechanism includes at least two stirring blades. The stirring mechanism may extend from the top or bottom of the tank body into the tank body.

[0097] like Figure 3As shown, in this embodiment, the stirring mechanism 3 includes a stirring blade 31 and a stirring shaft 32, the stirring shaft 32 is located at the center of the tank body 1 and is vertically arranged, and the stirring blade 31 is located at the bottom of the tank body 1 and rotates around the stirring shaft 32. When the dry-wet material mixing equipment is in operation, the cutter 4 is arranged at a position so that the mixed material can be cut when the stirring mechanism 3 is stirring. For example, the lowest point of the cutting knife 41 in the cutter 4 is higher than the spatial position of the highest point of the stirring blade 31 in the stirring mechanism 3. Preferably, the lowest point of the cutting knife 41 is 5-10mm higher than the highest point of the stirring blade 31. Preferably, the distance between the lower edge of the stirring blade 31 and the bottom surface 7 of the tank body is 1-2mm, which can not only facilitate the material to be stirred evenly, but also avoid friction with the bottom of the tank body 1 during operation, thereby reducing wear on the tank body 1.

[0098] Fig.9A The schematic diagram of the relative position relationship between the stirring blade and the stirring shaft of the dry-wet material mixing device of an embodiment of the present invention is shown. The angle between the axis of the stirring blade 31 and the central axis is α, and the angle between the axis of the stirring blade 31 and the central axis of the tank body 1 is 60-80 degrees. Fig.9A The middle angle α is 70 degrees. Further, the stirring blade 31 is parallel to the bottom surface 7 of the tank body. Fig. 9B A schematic diagram of a stirring mechanism of a dry-wet material mixing device according to an embodiment of the present invention is shown at a C perspective. A vertical plane A is defined, and the vertical plane A is colinear with the axis L of the stirring blade 31, that is, the vertical plane A intersects with the stirring blade 31 at the axis L, and the vertical plane A is perpendicular to the bottom surface 7 of the tank body. In this embodiment, the surface where the stirring blade 31 is located is an inclined surface relative to the vertical plane A, and the inclined surface forms an angle β with the vertical plane A, and the angle β is 30-60 degrees. Further, Fig. 9B The middle angle β is 45 degrees. The upper edge of the stirring blade is tilted away from the stirring direction. The surface that is collinear with the axis of the stirring blade and perpendicular to the bottom surface of the tank is defined as a vertical surface, the rotation direction of the stirring blade is the stirring direction, the surface where the stirring blade is located is an inclined surface relative to the vertical surface, and the upper edge of the stirring blade is away from the stirring direction V R The inclined surface is arranged at an angle β of 30-60 degrees to the vertical surface. Figure 4 For example, when the stirring blade 31 rotates counterclockwise around the stirring shaft 32, if the stirring blade 31 is set to be perpendicular to the bottom surface 7, only a speed tangential to the circumference of the tank body will be generated during stirring, that is, Fig. 9B The angle of view will only produce a horizontal rightward speed. In this embodiment, the stirring blade 31 has an angle β relative to the vertical plane A. Fig. 9B A force F perpendicular to the stirring blade 31 is generated from the perspective of x , which also includes the vertical upward component F yThe vertical upward force F y A vertical upward component velocity will be generated. In this embodiment, the purpose of setting the stirring blade 31 to be inclined is to increase the vertical upward component velocity of the material during stirring. On the one hand, under the condition of the same rotation and speed, it has a larger vertical upward velocity component, reducing the radial component velocity, thereby reducing the impact force on the tank wall; on the other hand, the vertical upward component velocity achieves the effect of throwing the material upward and increasing the uniformity of mixing. It has been found through testing that the above-mentioned inclination angle β is set to 30-60 degrees, which can better reduce the impact on the tank wall and increase the uniformity of mixing. In particular, with a stirring speed of 100-300r / min, a more excellent stirring effect can be achieved.

[0099] In one embodiment, the cutter is composed of a variable frequency drive motor, a reducer, a rotating shaft and a cutting knife. The rotating shaft can extend into the tank body from the side wall and be connected to the cutting knife, or extend into the tank body from the top of the tank body or extend into the tank body from the bottom in a coaxial form with the stirring shaft.

[0100] like Figure 7 As shown, the cutter 4 includes a rotating shaft 42 and a cutting blade 41. There are multiple cutting blades 41, which extend from the peripheral wall of the rotating shaft 42 in a direction away from the rotating shaft 42. The cutting blades 41 are spaced apart along the circumferential direction and axial direction of the rotating shaft 42. The rotation of the rotating shaft 42 drives the cutting blades 41 to rotate around the rotating shaft 42, thereby cutting the material. Preferably, 5 groups of cutting blades 41 are evenly arranged along the axial direction of the rotating shaft 42, and each group has 3 evenly arranged along the circumferential direction of the rotating shaft 42, for a total of 15 cutting blades. Under this arrangement, the rotating shaft 42 can cut the material evenly and fully. For example, Figure 4 In the top view shown, the stirring blade 31 rotates counterclockwise to stir. Figure 1 From a viewing angle, the rotating shaft 42 rotates counterclockwise to cut the dry and wet mixture.

[0101] Preferably, the cutting blade 41 is double-edged. Whether the rotating shaft 42 rotates clockwise or counterclockwise, the cutting blade 41 can achieve the effect of cutting the material. In this way, the rotation direction of the rotating shaft 42 can be changed during the mixing process to enrich the cutting direction.

[0102] Furthermore, the rotating shaft 42 extends from the side of the tank body 1 and extends along a cross section parallel to the tank body 1. For example, when the cross section of the tank body 1 is parallel to the horizontal plane, the rotating shaft is parallel to the horizontal plane.

[0103] Preferably, the rotating shaft 42 extends from the side of the tank body 1 to the center of the cross section of the tank body 1, such as Fig.11 As shown, the ratio of the insertion length a to the length b from the insertion opening to the center of the cross section of the tank body is 2 / 3-3 / 4, that is, a / b is 2 / 3-3 / 4, and the insertion opening is the position where the rotation axis 42 intersects the side of the tank body 1. For example, Figure 1-6As shown, the tank body 1 is a cylinder, and the rotating shaft 42 extends from the side of the tank body 1 to the center of the cross section of the tank body 1, that is, extends to the center of the tank body 1, and the length extending into the tank body 1 accounts for 2 / 3-3 / 4 of the radius of the cross section of the cylinder.

[0104] Furthermore, the bottom surface 7 of the tank body is a surface that is low in the middle and high around. The bottom surface 7 can be a curved surface or a conical surface, or it can be composed of multiple inclined planes, and the multiple inclined planes form a circle. The bottom surface 7 of the tank body is bowl-shaped or conical. The bowl shape includes the bottom surface 7 of the tank body being a continuous curved surface, and also includes a truncated cone shape. The cone shape can be, for example, a cone or a pyramid. Specifically, the projection of the bottom surface 7 of the tank body along the longitudinal section is a "C-shaped" with the opening facing upward, or a "V" shape. The stirring blade 31 is parallel to the bottom surface 7 of the tank body, and the extension direction of the stirring blade 31 is consistent with the extension direction of the bottom surface 7 of the tank body. The proximal end where the stirring blade 31 intersects with the stirring shaft 32 is lower than the distal end of the stirring blade 31, that is, the stirring blade 31 is tilted upward, and the tilt amplitude is consistent with the tilt amplitude of the bottom surface 7 of the tank body. When the tank bottom surface 7 is a continuous surface with a low center and high sides, the initial position of the particles is close to the bottom of the tank bottom surface 7, and driven by the stirring mechanism 3, the particle movement trajectory is an ascending spiral, moving from the bottom center to the edge of the tank bottom surface 7. That is, the movement of the particles is divided into radial outward movement, vertical upward movement along the axial direction of the tank body 1, and circular movement along the circumference of the tank body 1.

[0105] In one embodiment, the dry-wet material mixing equipment further includes a wet material spraying system 9 , which is composed of a wet material pump, a wet material nozzle 92 , a compressed air pipeline, and a wet material pipeline 91 .

[0106] like Figure 2 As shown in the bottom view, the wet material nozzle 92 is used to spray the wet material into the tank body 1. The wet material nozzle 92 is a dual-medium nozzle, also known as a binary nozzle. The nozzle has at least one first nozzle opening and a second nozzle opening. The second nozzle opening is formed by an annular gap, which is concentrically arranged relative to the first nozzle opening. The first nozzle opening is connected to the first cavity and / or the supply pipeline and the first cavity and / or the supply pipeline supply the liquid material to be atomized. The second nozzle opening is connected to the second cavity and / or the supply pipeline and the second cavity and / or the supply pipeline supply compressed air. The wet material sprayed by the wet material nozzle 92 is smaller than the droplets added by the traditional dripping method, and is less likely to form large lumps with the dry material. The wet material nozzle 92 can reduce the droplet size by compressed air injection on the one hand, and combined with the high-speed mixing of the cutting assembly, the particle nucleation follows the dispersion mechanism, and the size of the primary nuclear particles formed is relatively uniform. On the other hand, air injection can reduce the temperature of the wet material, so that the obtained primary nuclear particles have higher strength, and cannot produce sufficient deformation and agglomerate together in the initial collision.

[0107] like Fig.11, showing a schematic diagram of the projection of a wet material nozzle and a cutter on the cross section of a tank body according to an embodiment of the present invention. The wet material nozzle 92 is located upstream of the rotating shaft 42. The projection of the wet material nozzle 92 on the cross section of the tank body is defined as the wet material nozzle projection. The projection of the rotating shaft on the cross section of the tank body is defined as the rotating shaft projection. The angle γ between the wet material nozzle projection and the center line of the cross section of the tank body and the rotating shaft projection is 30-60 degrees. The upstream is the position that the stirring mechanism 3 first sweeps when it rotates. That is, Fig.11 As shown, the stirring blade 31 rotates counterclockwise from the top view, and the material first passes under the wet material nozzle 92 under the pushing action of the stirring blade 31, and then quickly passes through the cutter 4 and is cut by the cutting knife 41, so as to achieve the effect of quickly cutting the dry material and the wet material after mixing. Fig.11 As shown, the shaft 42 extends from the side of the tank body 1 to the center of the cross section of the tank body 1, and the ratio of the projection a of the shaft 42 on the cross section of the tank body to the projection length b from the extension port to the center of the cross section of the tank body is 2 / 3-3 / 4.

[0108] In the above embodiment, the wet material spraying area is located upstream of the cutter 4 along the material stirring running direction. After being sprayed, the material quickly passes through the cutting assembly, which can enhance the mixing of the wet material and the dry material.

[0109] Furthermore, the cold air system 5 includes a cold air head 52, a cold air outlet 53 and a cold air duct 51, and can be connected to an external cold air blower. In the cold air system 5, the refrigeration method of the cold air system 5 includes refrigeration by an external cold air blower or a compressed air vortex tube. The purpose of setting up the cold air system 5 is, on the one hand, to cool down and reduce the fluidity of the liquid material, reduce the rate of liquid material seeping out of the dry and wet material mixed particles, reduce the amount of liquid material on the surface of the particles, and make it difficult for the particles to be bonded through liquid bridges. On the other hand, the particles become hard after cooling, and when the mixture is stirred, the deformation caused by the collision between the particles is reduced, so that the contact area between the particles is reduced, and the particles are not easy to stick together. Fig. 8A , Figure 8B and Figure 8C The three-dimensional diagram, front view and bottom view of the cold air system 5 of the dry and wet material mixing equipment of an embodiment of the present invention are respectively shown. The cross section of the cold air head 52 is a slit type, and the longitudinal section of the air outlet of the cold air head 52 is a fan-shaped or trapezoidal shape. The purpose is to ensure the wind output force while expanding the sweeping range and improving the cooling effect of the equipment. The direction of the cold air head 52 can be set vertically downward or tilted. Fig.12 As shown, Fig.12 The schematic diagram of the air outlet direction and the cross section shows that when the air outlet is tilted, the air outlet direction is in the E direction, and the angle between the cold air head 52 and the cross section B is 45-60 degrees, that is, the angle δ between the cold air outlet direction and the cross section is 45-60 degrees. At this tilt angle, the mixed material can be cooled better and dust can be reduced.

[0110] Furthermore, the cross section of the cold air outlet 53 may be an annular surface, and the extension trend of the annular surface matches the trajectory of the circular motion portion of the material during the stirring process. For example, the extension trend of the annular surface is consistent with the trend of the circular motion portion of the material, and the cold air outlet 53 is placed along the circumference of the tank body, so that the mixed material can be exposed to the cold air within a certain distance of circumferential movement under the push of the stirring blade 31, thereby achieving more sufficient cooling.

[0111] Furthermore, the ratio of the effective mixing volume of the above-mentioned tank body 1 to the volume of the added material is 10:4-10:2, and further, the ratio of the effective mixing volume of the tank body 1 to the volume of the added material is 10:3. The effective mixing volume refers to the volume for mixing materials in the tank body 1, and the added material volume refers to the volume of the material itself. In this embodiment, it refers to the volume of the dry material input. The above ratio can ensure that the materials are fully mixed under the premise of ensuring the material production efficiency. In the above-mentioned equipment, the ratio between the effective mixing volume of the mixer and the material volume is larger than that of the general high-speed shear wet granulator, and the cutting knives are set to 5 groups with a total of 15 knives. In comparison, the number of cutting knives is more, which is beneficial to reduce the probability of mutual collision between particles during the granulation process, while enhancing the cutting and mixing effects.

[0112] Furthermore, the above-mentioned dry and wet material mixing equipment also includes a dust-proof component 6 placed on the top of the tank body, which is used to collect dry materials escaping from the tank body. The dust-proof component 6 includes a dust bag (not shown) and a hollow support column 61. The bottom of the support column 61 is connected to the tank body 1, and the top thereof is provided with a cover 63. The side wall of the support column 61 is provided with a plurality of through holes. The dust bag is located inside the support column 61, and the opening of the dust bag is docked with the bottom of the support column 61, which is used to collect dry materials escaping from the tank body 1. The cover 63 and the side wall on the top of the support column 61 limit the dust bag to prevent the dust bag from moving during the operation of the equipment. The side wall of the support column 61 is provided with a plurality of through holes to facilitate exhaust.

[0113] In some embodiments, a discharge port 81 is provided on the side wall of the tank body 1, and the dry-wet material mixing device further comprises a discharge mechanism 8 located on the side wall of the tank body 1, the discharge mechanism 8 comprises a horizontal pipe 86 connected to the discharge port 81, a baffle 83 located in the horizontal pipe 86, and a driving mechanism 87, a downwardly inclined drop port 82 is provided at the bottom of the horizontal pipe 86, and the driving mechanism 87 is used to drive the baffle 83 to move toward and away from the discharge port 81 to close and open the discharge port 81. The driving mechanism 87 may comprise a cylinder 84 and a connecting rod 85, and the cylinder 84 drives the connecting rod 85 to drive the baffle 83 to move along the axis of the horizontal pipe 86 to close and open the discharge port 81.

[0114] like Fig.13As shown, the present invention also provides a method for mixing dry and wet materials, which uses the dry and wet material mixing equipment in the above embodiments, including quantitative feeding of dry materials, premixing of dry materials, quantitative spraying of wet materials, cooling mixing and discharging. Specifically, it includes: adding dry materials and wet materials into the tank body 1, stirring and mixing to form a mixed material; cutting the mixed material in the tank body under stirring; and introducing cold air into the tank body 1 to cool the material in the tank body.

[0115] Further, for example, the method in one embodiment includes: first adding dry material to the tank body 1, operating the stirring mechanism 3 for stirring, and turning on the cutter 4 to cut the material in the stirring state to increase the uniformity of the mixing; then keeping the stirring mechanism 3 and the cutter 4 running, adding wet material in the stirring and cutting state, stirring and cutting while adding the wet material, and passing cold air into the tank body 1 to cool the mixed material. For example, the method in another embodiment includes: adding dry material and wet material to the tank body 1, then operating the stirring mechanism 3 for stirring, turning on the cutter 4 to cut the material in the stirring state, and passing cold air into the tank body 1.

[0116] The wet material can be added by spraying or directly adding.

[0117] Furthermore, in the above mixing method, after the wet material is added, cold air is introduced into the tank through the cold air system 5. The rate of the cold air introduced into the cold air system 5 is 500-2000m / s. 3 / h. According to experimental tests, at this air outlet rate, no excessive dust will be generated and the cooling effect is better. In the above mixing method, cold air is introduced, and an external air cooler or compressed air vortex tube cooling can be used. The air outlet should be set above the particle movement accumulation part, and the cold air is used to cool the mixed material to increase the contact area between the cold air and the particles, while reducing the air speed to avoid excessive dust. On the one hand, the cooled material has a greater hardness, which can reduce the deformation during the impact; on the other hand, cooling can increase the viscosity of the wet material and slow down the flow rate of the liquid to the internal voids of the particles during the particle deformation process.

[0118] Further, the stirring blade 31 is located at the bottom of the tank body 1 and rotates around the stirring shaft 32. In one embodiment, the rotation rate of the stirring blade 31 is 100-300 r / min, and further, the rotation rate of the stirring blade 31 is 220 r / min. After testing, the stirring effect is best at this stirring rate.

[0119] In addition, the cutter 4 includes a rotating shaft 42 and a cutting blade 41. Driven by the rotation of the rotating shaft 42, the cutting blade 41 rotates around the rotating shaft 42 to cut the material. In one embodiment, the rotation rate of the rotating shaft 42 is 1000-3000 r / min, and further, the rotation rate of the rotating shaft 42 is 1200 r / min. At this rotation rate, the cutting effect is optimal, and the cutting rate matches the stirring rate, that is, the material pushed by the stirring blade 31 is fully cut by the cutter 4, and the cutter 4 will not idle due to too little material.

[0120] Furthermore, in the above-mentioned mixing method, the direction of the material moving toward the cutter 4 driven by the stirring mechanism 3 is defined as the material advancing direction, and the direction of the material being cut by the cutter 4 is defined as the cutting direction of the cutter. The mixing method includes: adding wet material, setting the material advancing direction to be opposite to the cutting direction of the cutter, and after the wet material is added, setting the material advancing direction to be the same as the cutting direction of the cutter. For example, Fig. 10A A schematic diagram showing the opposite relationship between the material advancing direction and the cutting direction of the cutting knife in one embodiment of the present invention. Figure 5 From the F perspective (left perspective), the lower rotating shaft 42 drives the cutting blade 41 to rotate clockwise. Figure 4 When the stirring blade 31 rotates counterclockwise from a top view, the material's advancing direction is opposite to the cutting direction of the cutting blade, that is, the cutting blade cuts the mixed material head-on. When the material's advancing direction is opposite to the cutting direction of the cutting blade, the cutting blade collides and cuts the oncoming mixed material, so that the material is fully cut and mixed. Fig. 10B A schematic diagram showing the relationship between the material advancing direction and the cutting direction of the cutting blade in one embodiment of the present invention. The rotating shaft 42 drives the cutting blade 41 to rotate counterclockwise from the left side, and the stirring blade 31 rotates counterclockwise from the top side. At this time, the material advancing direction is the same as the cutting direction of the cutting blade, that is, the cutting blade cuts the mixed material with its back facing. When the material advancing direction is the same as the cutting direction of the cutting blade, the material is prevented from clumping and blocking the cutter 4.

[0121] Optionally, the angle δ between the outlet direction of the cold air system 5 and the tank cross section B is 45-60 degrees. Fig.12 In the embodiment, the angle δ between the outlet direction of the cold air system 5 and the tank cross section B is 45 degrees. Fig.12 The schematic diagram of the spatial position of the cooling air system of an embodiment of the present invention is shown. Under this air outlet direction, the material is cooled more fully and dust can also be reduced.

[0122] The present invention reduces the probability and intensity of collision between particles and containers and between particles through the above-mentioned equipment and method, and increases the hardness of particles and reduces their deformation in collision. Both measures can reduce the particle compaction phenomenon caused by the mechanical movement of particles during the granulation process, prolong the time that excess liquid stays inside the particles, and reduce the amount of liquid on the surface of particles, thereby slowing down the growth rate of particles, allowing particles to have more sufficient time to be broken and reassembled in the mixer, thereby improving mixing uniformity.

[0123] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0124] Example 1

[0125] A device for mixing dry and wet materials of roller-pressed sheets for heating cigarettes, such as Figure 1 As shown, it includes a mixing and granulating tank body 1, a bottom-driven stirring mechanism 3, a cutter 4, a wet material spraying system 9, a dust removal component 6, a cold air system 5, a discharge mechanism 8 and a control system (not shown).

[0126] The tank body 1 has a U-shaped longitudinal section and a cover on the top. One side of the cover is fixed to the tank body 1, and the other side is a movable upper cover 2, which can be opened to clean and repair the tank body 1. The top of the fixed cover is provided with a dry material inlet 10, a wet material spraying system 9, a cold air system 5 and a dust removal component 6. The side of the tank body 1 is provided with a cutter 4 and a discharge port 81, and the bottom of the tank body 1 is provided with an inlet for a stirring shaft 32.

[0127] The above-mentioned device includes a bottom-driven stirring mechanism 3, which is driven by a variable frequency motor through a reducer to drive a stirring shaft 32 to rotate through a pulley (not shown). The stirring mechanism 3 is composed of three blades 31, and the curvature of each stirring blade 31 is the same as the bottom surface 7 of the tank body 1, and is tilted upward at a certain angle along the rotation direction of the stirring blade 31, so that the particles obtain a greater lifting force;

[0128] The above-mentioned device includes a side-mounted cutter 4, which is driven by a variable frequency motor through a reducer through a rotating shaft 42 to rotate a longitudinal cutter 41. The cutter 4 is composed of 5 sets of blades, a total of 15 cutters 41 and a rotating shaft 42. The distance between the lower edge of the cutter 41 and the upper edge of the stirring blade 31 is about 5mm-10mm, and the movement of the lower edge of the cutter 41 is in the same direction as the rotation of the stirring blade 31.

[0129] The wet material spraying system 9 is composed of a wet material pipeline 91, a wet material nozzle 92, a wet material pump (not shown) and a compressed air pipe (not shown);

[0130] The dust removal component 6 is composed of a support column 61 and a dust removal bag (not shown in the figure);

[0131] The cold air system 5 is composed of a cold air machine (not shown), a cold air duct 51, a cold air head 52 and a cold air outlet 53;

[0132] The unloading mechanism 8 is located on the side wall of the tank body 1 close to the bottom of the tank, and is composed of a horizontal pipe 86, a discharge port 81, and a drop port 82. A unloading baffle 83 is placed in the horizontal pipe 86. The baffle 83 is driven to open and close by a driving mechanism 87. The driving mechanism 87 is composed of a cylinder 84 and a connecting rod 85.

[0133] Example 2

[0134] A method for mixing dry and wet materials of roller-pressed sheets for heating cigarettes, using the mixing device described in Example 1, comprises the following steps:

[0135] (1) Dry material is quantitatively discharged through the dry material inlet 10;

[0136] (2) Turn on the stirring motor and the cutting motor to drive the stirring blade 31 and the cutting blade 41 to premix the dry material, and the stirring blade 31 rotates counterclockwise (such as Figure 6 The cutting blade 41 rotates clockwise (as viewed from above). Figure 1 (Viewed from the left), the stirring motor runs at high speed, and the cutting motor runs at low speed;

[0137] (3) The wet material pump (not shown) and the compressed air in the wet material nozzle 92 are turned on, and the wet material nozzle 92 sprays the atomized wet material in a quantitative manner. The wet material is sprayed upstream of the cutting blade 41 along the moving direction of the stirring blade 31. The material sprayed with the wet material is quickly and strongly mixed by the dual effects of the stirring blade 31 and the cutting blade 41. While the wet material is sprayed, the speed of the cutting motor is gradually increased;

[0138] (4) After the wet material is sprayed, the stirring motor speed is reduced to reduce the impact of the particles on the tank wall; at the same time, the cold air system 5 is turned on to cool the material through the cold air outlet 53, slowing down the flow rate of the liquid material inside the particles and reducing the deformation of the particles during the collision process; during this process, the cutting motor speed is kept high;

[0139] (5) When mixing is finished, the cutting motor is turned off, the speed of the stirring motor is reduced, and the baffle 83 is retracted by the cylinder 84. Under the centrifugal action of the stirring motor, the material overflows from the discharge port 81 and is discharged through the discharge port 82.

[0140] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A device for mixing dry and wet materials, characterized in that: The device is used for mixing tobacco dry material and wet material to form a mixed material, comprising: A tank body, used to contain the mixed material; A stirring mechanism, used for stirring the mixed material in the tank; A cutter, used for cutting the mixed material in the tank under stirring; The cold air system is used to pass cold air into the tank body to cool the materials in the tank body.

2. The dry and wet material mixing equipment according to claim 1, characterized in that: The stirring mechanism comprises a stirring blade and a stirring shaft. The stirring shaft is located at the center of the tank body and is vertically arranged. The stirring blade is located at the bottom of the tank body and rotates around the stirring shaft.

3. The dry and wet material mixing equipment according to claim 2, characterized in that: The surface that is colinear with the axis of the stirring blade and perpendicular to the bottom of the tank is defined as a vertical surface, the rotation direction of the stirring blade is the stirring direction, the surface where the stirring blade is located is an inclined surface relative to the vertical surface, and the upper edge of the stirring blade is inclined away from the stirring direction, and the angle between the inclined surface and the vertical surface is 30-60 degrees.

4. The dry and wet material mixing equipment according to claim 2, characterized in that: The distance between the lower edge of the stirring blade and the bottom surface of the tank body is 1-2 mm.

5. The dry and wet material mixing equipment according to claim 1, characterized in that: The cutter comprises a rotating shaft and a cutting knife. The cutting knife is multiple and extends from the peripheral wall of the rotating shaft in a direction away from the rotating shaft. The cutting knife is distributed at intervals along the circumferential direction and axial direction of the rotating shaft.

6. The dry and wet material mixing equipment according to claim 5, characterized in that: The cutting knife is double-edged.

7. The dry and wet material mixing equipment according to claim 5, characterized in that: The rotating shaft extends from the side of the tank body and extends along a cross section parallel to the tank body.

8. The dry and wet material mixing equipment according to claim 7, characterized in that: The rotating shaft extends from the side of the tank body to the cross-sectional center of the tank body, and the ratio of the extending length to the length of the extension port from the cross-sectional center of the tank body is 2 / 3-3 / 4. The extension port is the position where the rotating shaft intersects the side of the tank body.

9. The dry and wet material mixing equipment according to claim 1, characterized in that: The bottom surface of the tank body is low in the middle and high around.

10. The dry and wet material mixing equipment according to claim 1, characterized in that: The bottom surface of the tank body is bowl-shaped or cone-shaped.

11. The dry and wet material mixing equipment according to claim 1, characterized in that: It also includes a wet material spray head for spraying wet material into the tank body.

12. The dry and wet material mixing equipment according to claim 5, characterized in that: It also includes a wet material spray head located upstream of the rotating shaft, the projection of the wet material spray head on the cross section of the tank body is defined as the wet material spray head projection, the projection of the rotating shaft on the cross section of the tank body is defined as the rotating shaft projection, the angle between the wet material spray head projection and the center line of the cross section of the tank body and the rotating shaft projection is 30-60 degrees, and the upstream is the position that the stirring mechanism first sweeps through when it rotates.

13. The dry and wet material mixing equipment according to claim 1, characterized in that: The cold air system comprises a cold air head, wherein the cold air head has an air outlet, and the air outlet is a slit type.

14. The dry and wet material mixing device according to claim 13, characterized in that: The longitudinal section of the cold air head is fan-shaped or trapezoidal.

15. The dry and wet material mixing equipment according to claim 13, characterized in that: The air outlet is in the shape of a ring, and the extension trend of the ring matches the trajectory of the circular motion part of the material during the stirring process.

16. The dry and wet material mixing equipment according to claim 1, characterized in that: The ratio of the effective mixing volume of the tank to the volume of the added material is 10:4-10:

2.

17. The dry and wet material mixing equipment according to claim 1, characterized in that: The dry and wet material mixing device comprises a dust-proof component arranged on the top of the tank body, which is used for collecting the dry material escaping from the tank body.

18. The dry and wet material mixing equipment according to claim 17, characterized in that: The dust-proof component includes a dust bag and a hollow support column, the bottom of the support column is connected to the tank body, and the top is provided with a sealing cover. The side wall of the support column is provided with a plurality of through holes, the dust bag is located inside the support column, and the opening of the dust bag is connected to the bottom of the support column.

19. The dry and wet material mixing equipment according to claim 1, characterized in that: A discharge port is provided on the side wall of the tank body, and the dry-wet material mixing equipment also includes a discharge mechanism located on the side wall of the tank body, the discharge mechanism includes a horizontal pipe connected to the discharge port, a baffle located in the horizontal pipe, and a driving mechanism, a drop port is provided at the bottom of the horizontal pipe, and the driving mechanism is used to drive the baffle to move toward and away from the discharge port to close and open the discharge port.

20. A method for mixing dry and wet materials, characterized in that: The mixing method uses the dry and wet material mixing equipment according to claims 1 to 19, comprising the following steps: Adding dry material and wet material into the tank, stirring and mixing to form a mixed material; cutting the mixed material in the tank body under stirring; Cold air is introduced into the tank body to cool the material in the tank body.

21. The mixing method according to claim 20, wherein after the wet material is added, cold air is introduced into the tank through the cold air system.

22. The mixing method according to claim 20, wherein the stirring mechanism comprises a stirring blade and a stirring shaft, wherein the stirring shaft is located at the center of the tank body and is vertically arranged, and the stirring blade is located at the bottom of the tank body and rotates around the stirring shaft, and the rotation rate of the stirring blade is 100-300r / min.

23. The mixing method as described in claim 22, wherein the cutter comprises a rotating shaft and cutting blades, wherein the cutting blades are multiple and extend from the peripheral wall of the rotating shaft in a direction away from the rotating shaft, wherein the cutting blades are spaced apart along the circumference and axial directions of the rotating shaft, and the rotation rate of the rotating shaft is 1000-3000 r / min.

24. The mixing method according to claim 23, wherein the direction of the material moving toward the cutter driven by the stirring mechanism is defined as the material advancing direction, and the direction of the material being cut by the cutter is defined as the cutting direction of the cutting blade, and the mixing method comprises: Add wet material, set the material advancing direction to be opposite to the cutting direction of the cutting knife, and after the wet material is added, set the material advancing direction to be the same as the cutting direction of the cutting knife.

25. The mixing method according to claim 20, wherein the angle between the air outlet direction of the cold air system and the cross section of the tank body is 45-60 degrees.

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