A dry premixing device for gypsum slurry preparation raw materials

Abstract

The application discloses a kind of dry method premixing device of gypsum slurry preparation raw material, comprising: screening part, crushing part, premixing bin, screening part has the vibration sieve plate for screening out agglomerated gypsum and is arranged obliquely, and the lower portion of vibration sieve plate is equipped with discharging plate;Crushing part includes two oppositely arranged roller, two roller can be reversed by power motor rotation;Premixing bin is equipped below crushing part by suspension spring;The side wall part of the roller of one end of discharging plate and premixing bin is connected with outward bulge and forms bulge, forms concave portion between adjacent bulge, and forms space for agglomerated gypsum crushing between the opposite bulge of two roller;The application is processed by the setting of screening part and crushing part, solves when the gypsum block containing gypsum powder, cannot be separately scattered, the problem that the scattering effect of agglomerated gypsum is poor, and by the setting of premixing bin, different humidity gypsum powder carried therein can be mixed uniformly by the vibration of vibrator.

Description

Technical Field

[0001] This invention relates to the field of paper-faced gypsum board manufacturing equipment technology, specifically to a dry premixing device for preparing gypsum slurry raw materials. Background Technology

[0002] During the preparation of gypsum slurry raw materials, building gypsum powder is often piled up on the warehouse floor when stored in large quantities, or piled up for a long time after simple moisture-proof treatment. This causes the gypsum powder to easily absorb moisture from the air and the ground and clump together. In subsequent processes, the clumps of gypsum are difficult to mix evenly with other materials.

[0003] In existing technologies, crushers and dispersants are often used to break down the gypsum powder as a whole. However, since the gypsum blocks and powder are not pre-separated before being broken down and are injected into the crusher and dispersant together, material blockage is likely to occur, which seriously affects the dispersing effect of the equipment.

[0004] Therefore, it is necessary to provide a dry premixing device for preparing gypsum slurry raw materials to solve the problems in the prior art that it is impossible to break up lumpy gypsum separately and that the breaking up effect of lumpy gypsum is not good. Summary of the Invention

[0005] The purpose of this invention is to provide a dry premixing device for preparing raw materials for gypsum slurry, so as to solve the problem that existing devices cannot separate lumps of gypsum and have poor dispersing effect when processing gypsum powder containing gypsum lumps.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] In a first aspect of the invention, a dry premixing apparatus for preparing gypsum slurry raw materials is provided, comprising: a screening section having an inclined vibrating screen plate for screening out agglomerated gypsum, a feeding plate disposed below the vibrating screen plate, the feeding plate and the vibrating screen plate having the same inclination direction, the feeding plate for receiving and conveying the gypsum powder and additives to be screened, the ends of the vibrating screen plate and the feeding plate being supported by height-adjustable supports; and a crushing section disposed on one side of the screening section for receiving the agglomerated gypsum screened out by the vibrating screen plate, the crushing section comprising two opposing rollers, the two rollers being capable of... The motor generates reverse rotation; the premixing chamber is located below the crushing section via a suspension spring, and the bottom of the premixing chamber is equipped with a vibrator that can drive it to vibrate, thereby using the vibration of the premixing chamber to fully mix the additives and gypsum powder; the feeding end of the feeding plate is connected to one end of the premixing chamber so that the two streams of gypsum powder formed by the feeding plate and the crushing section can converge inside the premixing chamber; the side wall of the roller protrudes outward to form a raised part, and a concave part is formed between adjacent raised parts, and a space for crushing agglomerated gypsum is formed between the raised parts of the two rollers.

[0008] Furthermore, the feeding plate is provided with multiple linearly arranged protruding ridges with triangular cross-sections, and adjacent protruding ridges form a feeding channel along the feeding direction of gypsum powder.

[0009] Furthermore, the sidewalls of the protrusions and recesses are provided with multiple side ridges equidistantly along the roller axis on the circumferential direction. The side ridges are used to increase the friction force when the lumpy gypsum is squeezed.

[0010] Furthermore, the outer side wall of the roller is provided with a plurality of extrusion rollers along its axial direction, and the extrusion rollers at least partially protrude from the outer side wall of the roller; wherein, an extrusion sleeve is fitted on the roller, and the extrusion sleeve is tensioned by the extrusion rollers to form a regular polygonal structure with the extrusion rollers as vertices. A plurality of extrusion protrusions are evenly distributed on the outer surface of the extrusion sleeve, so that when the extrusion rollers revolve around the roller, the extrusion rollers rotate under the tension force of the extrusion sleeve, and the extrusion sleeve remains relatively stationary.

[0011] Furthermore, the inner side of the extrusion sleeve is provided with circumferentially equidistant meshing parts one, and the extrusion roller is provided with circumferentially meshing parts two that mesh with meshing parts one, thereby preventing the extrusion roller from sliding relative to the extrusion sleeve when it rotates.

[0012] Furthermore, the extrusion sleeve is made of an elastic material, with the portion of the extrusion sleeve lifted by the extrusion roller forming a protrusion, and a concave portion forming between adjacent protrusions; wherein, a circumferential elastic band is provided on the inner wall of the extrusion sleeve, and the deformation of the extrusion sleeve can be divided into the following working conditions according to the relative position of the extrusion roller and the elastic band:

[0013] First working condition: When the extrusion roller revolves to the position of the elastic belt, the extrusion roller lifts up the extrusion sleeve along with the elastic belt to form a protrusion. The elastic belt stores elastic potential energy due to being stretched, while the concave part relies on its own rebound force to form a belt surface parallel to all surfaces of the roller.

[0014] Second working condition: When the extrusion roller revolves past the position of the elastic belt, the elastic belt relies on its stored elastic potential energy to rebound and stretch the edge of the protrusion in the first working condition, thereby resisting the elastic force of the protrusion itself and allowing the protrusion to recover its deformation and come close to the outer wall of the roller.

[0015] Furthermore, the inner wall of the extrusion sleeve is provided with multiple magnetic strips along the roller axis in the circumferential direction, and the recess is attracted to the outer wall by the roller through the magnetic strips.

[0016] Furthermore, the sidewall of the roller is provided with uniformly distributed trapezoidal convex teeth, and a protective sleeve is fitted on the convex teeth.

[0017] Furthermore, an additive compartment is provided at the end of the feeding plate; wherein, the additive is conveyed inside the additive compartment by a spiral cutter, and a feeding port is provided on the side wall of the additive compartment near the feeding plate, so that the additive flows evenly to the feeding plate and mixes with the gypsum powder.

[0018] Furthermore, the positions of the discharge port and the discharge channel correspond, and the diameter of the discharge port gradually increases along the conveying direction of the spiral reamer, so that the discharge amount of the discharge port remains consistent when the material pressure in the additive bin changes.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention aims to achieve the following by setting up a screening section and a crushing section: during the screening of building gypsum powder containing lumps, the gypsum powder first falls downwards onto the feed plate and is then conveyed along its conveying surface to the premixing silo. The gypsum blocks that are screened are conveyed along the conveying surface of the vibrating screen plate to the crushing section. After being crushed by the rollers to form gypsum powder, they fall into the premixing silo. The premixing silo can mix the gypsum powders with different moisture contents evenly through the vibration of the vibrator. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 A front view of a dry premixing apparatus for preparing gypsum slurry raw materials provided by the present invention;

[0023] Figure 2 for Figure 1 A three-dimensional view of the fractured section shown;

[0024] Figure 3 for Figure 1 A three-dimensional view of the screening section shown;

[0025] Figure 4 for Figure 3 Enlarged view of section I-I;

[0026] Figure 5 for Figure 2 The diagram shown is a structural schematic of the roller in one embodiment of the present invention;

[0027] Figure 6 for Figure 2 The diagram shown is a structural schematic of the roller in one embodiment of the present invention;

[0028] Figure 7 for Figure 6 Exploded view;

[0029] Figure 8 for Figure 6 Side view;

[0030] Figure 9 for Figure 8 The sectional view shown is along line AA.

[0031] Figure 10 for Figure 9 Enlarged view of II-II shown;

[0032] Figure 11 for Figure 2 The diagram shown is a structural schematic of the roller in one embodiment of the present invention;

[0033] Figure 12 for Figure 11 Enlarged view of section III-III;

[0034] Figure 13 for Figure 2 The diagram shown is a structural schematic of the roller in one embodiment of the present invention;

[0035] Figure 14 for Figure 13 Enlarged view of section IV-IV;

[0036] Figure 15 for Figure 2 The diagram shown is a structural schematic of the roller in one embodiment of the present invention;

[0037] Figure 16 for Figure 3 The diagram shows a structural schematic of the screening section in one embodiment of the present invention;

[0038] Figure 17 for Figure 16 The diagram shows the internal structure of the additive storage compartment.

[0039] The labels in the diagram represent the following:

[0040] 10. Screening section; 11. Vibrating screen plate; 12. Feeding plate; 121. Raised ridge; 122. Feeding channel; 13. Support; 14. Additive bin; 141. Spiral auger; 142. Feeding port; 20. Crushing section; 21. Roller; 211. Raised part; 212. Concave part; 213. Side ridge; 22. Extrusion roller; 221. Meshing part two; 23. Extrusion sleeve; 23c. Elastic band; 231. Extrusion protrusion; 232. Meshing part one; 24. Magnetic strip; 25. Raised tooth; 251. Tooth sleeve; 30. Premix bin; 31. Suspension spring; 32. Vibrator. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1-3 , Figure 5 As shown, the present invention provides a dry premixing device for preparing raw materials for gypsum slurry, comprising:

[0043] The screening section 10 has an inclined vibrating screen plate 11 for screening out agglomerated gypsum. A feeding plate 12 is provided below the vibrating screen plate 11. The feeding plate 12 and the vibrating screen plate 11 are inclined in the same direction. The feeding plate 12 is used to receive and transport the gypsum powder and additives to be screened. The ends of the vibrating screen plate 11 and the feeding plate 12 are respectively supported by height-adjustable brackets 13.

[0044] The crushing section 20 is located on one side of the screening section 10 and is used to receive the lumpy gypsum screened out by the vibrating screen plate 11. The crushing section 20 includes two oppositely arranged rollers 21, which can be rotated in opposite directions by a power motor.

[0045] The premixing chamber 30 is located below the crushing section 20 via a suspension spring 31. The bottom of the premixing chamber 30 is equipped with a vibrator 32 that can drive it to vibrate, thereby using the vibration of the premixing chamber 30 to fully mix the additives and gypsum powder.

[0046] The feeding end of the feeding plate 12 is connected to one end of the premixing bin 30 so that the two gypsum powder flows formed by the feeding plate 12 and the crushing part 20 can converge inside the premixing bin 30.

[0047] The sidewall portion of roller 21 protrudes outward to form a protrusion 211, and a recess 212 is formed between adjacent protrusions 211. A space for breaking up clumps of gypsum is formed between the opposing protrusions 211 of two rollers 21.

[0048] This invention aims to achieve the following: During the screening of gypsum powder containing lumps, the gypsum powder first falls downwards onto the feed plate 12 and is then conveyed along its conveying surface to the premixing silo 30. The gypsum lumps that are screened are conveyed along the conveying surface of the vibrating screen plate 11 to the crushing section 20. After being crushed by the rollers 21 to form gypsum powder, they fall into the premixing silo 30. The premixing silo 30 can be used by the vibration of the vibrator 32 to ensure that the gypsum powder with different moisture content is mixed evenly. Specifically, before using this device, the vibrating screen plate 11, rollers 21, and vibrator 32 are all in operation. Then, the gypsum powder is injected from the upper end of the vibrating screen plate 11 along its screening and conveying surface. The gypsum powder is screened out by its own vibration and falls onto the feed plate 12 for subsequent conveying. The gypsum blocks on the vibrating screen plate 11 continue to roll obliquely downwards along the conveying surface of the vibrating screen plate 11 to the crushing section 20 for compression and crushing. During the compression and crushing process of the gypsum blocks by the two opposing rollers 21, the unevenness of the roller 21's compression wall is improved due to the setting of the protrusion 211, thereby improving its compression and crushing capacity and efficiency. The gypsum blocks after compression and crushing are transformed into gypsum powder with higher moisture content. It falls into the premixing chamber 30 by its own gravity and vibrates and mixes evenly with the gypsum powder input on the feeding plate 12. At the same time, in order to achieve dry mixing and addition of additives for gypsum slurry preparation, the additives can also be pre-injected from the upper end of the feeding plate 12 and conveyed into the premixing chamber 30 to vibrate and mix with the building gypsum powder. Finally, a uniformly mixed gypsum slurry preparation raw material is obtained in the premixing chamber 30.

[0049] To increase the uniformity of gypsum powder received by the feeding plate 12 during its conveying process and to prevent gypsum powder accumulation on the conveying surface, thus avoiding difficulties in feeding, Figures 3-4 As shown, in a preferred embodiment of the present invention based on the above embodiments, the feeding plate 12 is provided with a plurality of linearly arranged protruding ribs 121 with a triangular cross-section, and a feeding channel 122 is formed between adjacent protruding ribs 121 along the feeding direction of gypsum powder.

[0050] In this embodiment, due to the setting of the protruding ridge 121 on the conveying surface of the feeding plate 12, most of the gypsum powder is dispersed into the feeding channel 122 and conveyed in a downward direction when it falls onto the feeding plate 12. This avoids the gypsum powder from accumulating in one place on the conveying surface of the feeding plate 12 after screening, or even accumulating to the height of the bottom surface of the vibrating screen plate 11 above it, which would cause difficulties in subsequent screening and feeding.

[0051] To further enhance the crushing capacity of roller 21 by increasing the unevenness of the crushing wall surface, please refer to [link / reference needed]. Figure 5In a preferred embodiment of the present invention based on the above embodiments, the sidewalls of the protrusion 211 and the recess 212 are provided with a plurality of side ridges 213 equidistantly along the axial direction of the roller 21. The side ridges 213 are used to increase the friction force when the lumpy gypsum is squeezed.

[0052] In this embodiment, the side ridge 213 not only improves the crushing capacity of the roller 21, making the gypsum block crushing more thorough and the crushing efficiency higher, but also prevents the gypsum block from adhering to the side wall surface of the roller 21 when it is crushed into gypsum powder with high moisture content.

[0053] In the above embodiments, relying solely on the side ridge 213 to prevent gypsum blocks from adhering to the side wall surface of roller 21 when crushed into gypsum powder with high moisture content is not sufficient to prevent the adhered gypsum powder from re-agglomerating on the side wall of roller 21 for a long time, thereby reducing the crushing effect of roller 21 on gypsum blocks.

[0054] To better address the above issues, such as Figures 6-7 As shown, in another embodiment of the present invention, a plurality of extrusion rollers 22 are provided circumferentially on the outer side wall of the roller 21 along its axial direction, and the extrusion rollers 22 at least partially protrude from the outer side wall of the roller 21.

[0055] The roller 21 is fitted with a compression sleeve 23. The compression sleeve 23 is tensioned by the compression roller 22 to form a regular polygonal structure with the compression roller 22 as the vertex. Multiple compression protrusions 231 are evenly distributed on the outer side of the compression sleeve 23 so that when the compression roller 22 revolves around the roller 21, the compression roller 22 rotates under the tension of the compression sleeve 23, and the compression sleeve 23 remains relatively stationary.

[0056] In this embodiment, the extrusion roller 22 and extrusion sleeve 23 are designed to allow the easily replaceable extrusion sleeve 23 to directly contact the plaster block. The extrusion protrusion 231 assists the extrusion roller 22 in crushing the plaster block, effectively protecting the internal rollers 21 and extrusion roller 22 and preventing them from being damaged or plaster powder from adhering to their surface during the extrusion process. Furthermore, the rotation and revolution of the extrusion roller 22 continuously pushes the surface of the extrusion sleeve 23, causing the shape of the contact surface between the extrusion sleeve 23 and the plaster block to change dynamically at all times. This effectively reduces the formation of material caking on the surface of the extrusion sleeve 23 when the plaster block is crushed.

[0057] To address the problem that during the relative movement of the extrusion sleeve 23 and the extrusion roller 22, the different tension of the extrusion sleeve 23 can cause the extrusion roller 22 to slide relative to the extrusion sleeve 23, preventing it from rotating, as follows: Figures 8-10As shown, in a preferred embodiment of the present invention based on the above embodiments, the inner side of the extrusion sleeve 23 is provided with a circumferentially equidistant meshing portion 232, and the extrusion roller 22 is provided with a circumferentially meshing portion 221 that meshes with the meshing portion 232, thereby preventing the extrusion roller 22 from sliding relative to the extrusion sleeve 23 when it rotates.

[0058] In this embodiment, by setting the first meshing part 232 and the second meshing part 221, the problem of the extrusion roller 22 slipping relative to the extrusion sleeve 23 and failing to rotate is avoided, thereby reducing the excessive wear when the extrusion roller 22 slides relative to the inner wall of the extrusion sleeve 23 and extending the service life of the extrusion sleeve 23.

[0059] To solve the problem of plaster sticking to the extrusion sleeve 23 and not being able to fall off automatically, such as Figures 11-12 As shown, in a preferred embodiment of the present invention based on the above embodiments, the extrusion sleeve 23 is made of elastic material, and the portion of the extrusion sleeve 23 that is pushed up by the extrusion roller 22 forms a protrusion, and a concave portion is formed between adjacent protrusions;

[0060] The inner wall of the extrusion sleeve 23 is provided with a circumferential elastic band 23c. Based on the relative position of the extrusion roller 22 and the elastic band 23c, the deformation of the extrusion sleeve 23 can be divided into the following working conditions:

[0061] First working condition: When the extrusion roller 22 revolves to the position of the elastic band 23c, the extrusion roller 22 lifts up the extrusion sleeve 23 and the elastic band 23c together to form a protrusion. The elastic band 23c stores elastic potential energy because it is stretched, while the concave part forms a band surface parallel to all surfaces of the roller 21 by relying on its own rebound force.

[0062] Second working condition: When the extrusion roller 22 rotates past the position of the elastic belt 23c, the elastic belt 23c relies on its stored elastic potential energy to rebound and stretch the edge of the protrusion in the first working condition, thereby resisting the elastic force of the protrusion itself and causing the protrusion to recover its deformation and come close to the outer wall of the roller 21.

[0063] In this embodiment, the elastic band 23c enhances the deformation capability of the contact surface between the extrusion sleeve 23 and the plaster block. The stretching of the extrusion sleeve 23 by the elastic band 23c increases the degree of concavity of the recess, giving it greater deformation when the convex part is formed later. This makes the plaster adhering to it more likely to fall off due to the shaking effect generated by the deformation of the extrusion sleeve 23, thereby ensuring the extrusion roller 22's ability to crush the plaster block.

[0064] like Figures 13-14 As shown, in another optional embodiment of the present invention to solve the above problems, the inner sidewall of the extrusion sleeve 23 is provided with a plurality of magnetic strips 24 along the axial direction of the roller 21, and the recess is attracted to the outer sidewall by the roller 21 through the magnetic strips 24.

[0065] In this embodiment, the magnetic strip 24 makes the concave portion formed by the extrusion sleeve 23 during deformation easily attracted to the iron roller 21, thereby increasing the degree of concavity of the concave portion, preventing material from sticking to the extrusion sleeve 23 and improving the extrusion crushing capacity of the extrusion roller 22.

[0066] In the actual use of the dry premixing device for preparing gypsum slurry raw materials provided by the present invention in one embodiment, in order to reduce the wear of roller 21 and ensure its extrusion and crushing capacity, such as... Figure 15 As shown, the roller 21 is generally provided with uniformly distributed trapezoidal cross-section protrusions 25 on its side wall, and a protective sleeve 251 is fitted on the protrusions 25.

[0067] To further achieve the dry mixing and addition of additives for gypsum slurry preparation, such as... Figures 16-17 As shown, in another embodiment of the present invention, an additive compartment 14 is provided at the end of the feeding plate 12;

[0068] The additives are conveyed inside the additive bin 14 by a spiral cutter 141. The side wall of the additive bin 14 is provided with a discharge port 142 near the discharge plate 12, so that the additives flow evenly to the discharge plate 12 and mix with the gypsum powder.

[0069] In this embodiment, the additive bin 14 allows the amount of additive to be quantitatively and evenly conveyed to the feed plate 12 by the spiral reamer 141 inside the bin and mixed with the gypsum powder.

[0070] To ensure that the discharge amount at each discharge port 142 remains consistent and to prevent uneven discharge during additive conveying due to decreased material discharge pressure, please refer to the following: Figure 17 In the preferred embodiment provided by the above embodiments, the positions of the discharge port 142 and the discharge channel 122 correspond, and the diameter of the discharge port 142 gradually increases along the conveying direction of the spiral reamer 141, so that the discharge amount of the discharge port 142 remains consistent when the material pressure in the additive bin 14 changes.

[0071] In this embodiment, by setting the feed inlet 142 with gradually increasing diameter, not only can the additive be directly added to each feed channel 122, ensuring a certain degree of mixing uniformity during additive addition, but the amount of additive added to each feed inlet 142 is basically consistent, further improving the uniformity of additive addition.

[0072] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A dry-premixing device for gypsum slurry production raw materials, characterized in that, The application relates to a gypsum powder production device, which comprises the following parts: a screening part (10) with a vibrating screen plate (11) arranged in a slope mode for screening out agglomerated gypsum, a discharging plate (12) arranged below the vibrating screen plate (11), the discharging plate (12) and the vibrating screen plate (11) having the same slope direction, the discharging plate (12) being used for receiving and conveying the screened gypsum powder and additives, and the ends of the vibrating screen plate (11) and the discharging plate (12) being supported by height-adjustable supports (13); a crushing part (20) arranged on one side of the screening part (10) and used for receiving the agglomerated gypsum screened out by the vibrating screen plate (11), the crushing part (20) comprising two oppositely arranged roller wheels (21), and the two roller wheels (21) being capable of rotating reversely by a power motor; a premixing bin (30) arranged below the crushing part (20) by a suspension spring (31), the bottom of the premixing bin (30) being provided with a vibrator (32) capable of driving the premixing bin (30) to vibrate, so that the additives and the gypsum powder are fully mixed by the vibration of the premixing bin (30); wherein one end of the discharging plate (12) is connected with one end of the premixing bin (30), so that the two streams of gypsum powder respectively formed by the discharging plate (12) and the crushing part (20) can meet in the premixing bin (30); a plurality of extrusion rollers (22) are circumferentially arranged on the outer side wall of the roller wheel (21) and extend along the axial direction of the roller wheel (21), and the extrusion rollers (22) at least partially protrude from the outer side wall of the roller wheel (21); wherein an extrusion rubber sleeve (23) is arranged on the roller wheel (21), the extrusion rubber sleeve (23) is tensioned by the extrusion rollers (22) to form a regular polygonal structure with the extrusion rollers (22) as the vertexes, and a plurality of extrusion protrusions (231) are uniformly distributed on the outer side of the extrusion rubber sleeve (23), so that when the extrusion rollers (22) revolve around the roller wheel (21), the extrusion rollers (22) rotate on their own axes under the tension of the extrusion rubber sleeve (23), and the extrusion rubber sleeve (23) remains relatively static.

2. A dry pre-mixing device for gypsum slurry preparation raw materials according to claim 1, characterized in that, The inner side of the extrusion rubber sleeve (23) is provided with a plurality of meshing parts I (232) arranged at equal intervals in the circumferential direction, and the extrusion rollers (22) are provided with a plurality of meshing parts II (221) arranged in the circumferential direction and meshing with the meshing parts I (232), so that the extrusion rollers (22) do not slide relative to the extrusion rubber sleeve (23) when rotating.

3. A dry pre-mixing device for gypsum slurry production raw materials according to claim 2, characterized in that, The extrusion rubber sleeve (23) is made of an elastic material, the part of the extrusion rubber sleeve (23) lifted by the extrusion rollers (22) forms a convex part, and a concave part is formed between adjacent convex parts. wherein the inner side wall of the extrusion rubber sleeve (23) is provided with a circumferential elastic belt (23c), and according to the relative positions of the extrusion rollers (22) and the elastic belt (23c), the deformation of the extrusion rubber sleeve (23) can be divided into the following working conditions: First working condition: when the extrusion roller (22) revolves to the position of the elastic belt (23c), the extrusion roller (22) lifts up the extrusion rubber sleeve (23) and the elastic belt (23c) together to form the convex part, the elastic belt (23c) stores elastic potential energy due to being stretched, and the concave part forms a belt surface parallel to all surfaces of the roller (21) by relying on its own elastic force; Second working condition: when the extrusion roller (22) revolves through the position of the elastic belt (23c), the elastic belt (23c) relies on the elastic potential energy stored to rebound to stretch the edge of the convex part in the first working condition, thereby resisting the elastic force of the convex part itself, so that the convex part restores deformation to be close to the outer side wall of the roller (21).

4. A dry pre-mixing device for gypsum slurry preparation raw materials according to claim 3, characterized in that, The inner side wall of the extrusion rubber sleeve (23) is provided with a plurality of magnetic strips (24) in the axial direction of the roller (21), and the concave part is attracted close to the outer side wall of the roller (21) by the magnetic strips (24).

5. The dry premixing device for gypsum slurry preparation raw materials according to claim 1, wherein the discharge plate (12) is provided with a plurality of linearly arranged convex edges (121) with triangular cross sections, and adjacent convex edges (121) form a discharge channel (122) in the direction of gypsum powder discharge.

6. The dry premixing device for gypsum slurry preparation raw materials according to claim 5, wherein the end of the discharge plate (12) is provided with an additive bin (14).

7. The dry premixing device for gypsum slurry preparation raw materials according to claim 6, wherein the additive bin (14) is internally provided with a spiral reamer (141) for conveying additives, and the sidewall of the additive bin (14) is provided with a discharge port (142) close to the discharge plate (12), so that the additives are uniformly mixed with the gypsum powder on the discharge plate (12).

7. The dry premixing device for gypsum slurry preparation raw materials according to claim 6, wherein the position of the discharge port (142) corresponds to that of the discharge channel (122), and the diameter of the discharge port (142) gradually increases in the conveying direction of the spiral reamer (141), so that the discharge amount of the discharge port (142) remains consistent when the material pressure in the additive bin (14) changes. ​ ​ ​

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