Drying mechanism for alpha-type high-strength gypsum preparation

Abstract

The drying mechanism comprises an air outlet assembly, the air outlet assembly communicates with a stirring and crushing assembly through a heating assembly, the top of the stirring and crushing assembly is connected with a vertical drying shell, a discharging pipe opening in the top of the drying shell is connected with a material receiving assembly, and a feeding shell is arranged on the stirring and crushing assembly; the feeding shell is externally connected with a spiral feeding structure. A pretreatment structure is arranged in the stirring and crushing assembly, and wet filter cakes conveyed by the feeding shell are firstly flattened and then crushed and stirred. In the flattening process, the specific surface area of materials can be increased, the block strength is reduced, part of free water is extruded, and the crushing efficiency and the drying speed are improved. Through the pretreatment rolling structure, filter cake-shaped wet materials are spread into a thin layer, the specific surface area is increased, the block strength is reduced, and the filter cake-shaped wet materials are rapidly disintegrated and dispersed in the stirring and crushing process; meanwhile, part of free water is extruded out, the drying load is reduced, moisture migration and evaporation are accelerated, and the flash drying efficiency and finished product uniformity are improved.

Description

Technical Field

[0001] This invention relates to the field of α-type high-strength gypsum preparation, specifically to a drying mechanism for α-type high-strength gypsum preparation. Background Technology

[0002] In the field of gypsum material preparation, α-type high-strength gypsum is widely used in new building materials, precision casting, medical models, and decorative components due to its complete crystal structure, high strength, and good dimensional stability. In industrial production, α-type hemihydrate gypsum crystals are often prepared using hydrothermal or pressure conversion methods, followed by solid-liquid separation to form a filter cake-like wet material. This type of filter cake typically has high moisture content, a dense structure, and a coexistence of internal free water and pore water. If it directly enters the drying process, it is prone to problems such as "high moisture content, strong agglomeration, and an overall blocky structure that is difficult to break" in the early stages of drying.

[0003] To improve production efficiency, α-type high-strength gypsum filter cake is often used in conjunction with airflow drying or flash drying equipment for rapid dehydration. Flash dryers achieve transient heat and mass transfer through high-speed hot airflow and full contact with the wet material, offering advantages such as fast drying speed, small footprint, and suitability for continuous processing of powder materials, and have been widely used in the gypsum and powder materials industry. However, in actual operation, because the filter cake remains in a blocky or agglomerated state when entering the drying equipment, its internal moisture is difficult to migrate to the surface in a short time. This leads to: high crushing resistance and low deagglomeration efficiency in the initial drying stage; difficulty in full contact between wet lumps and hot airflow, resulting in uneven drying; long evaporation paths in localized areas, leading to concentrated evaporation loads; and the potential retention or carryover of large particles or wet lumps into subsequent classification stages.

[0004] The above factors not only affect the mixing, crushing and dispersion effects, but also reduce the heat and mass transfer efficiency of the flash drying stage, resulting in a longer drying cycle, increased energy consumption, and problems such as incomplete drying or fluctuations in product moisture content.

[0005] Against this backdrop, it is necessary to improve the pretreatment method of filter cake-shaped α-type high-strength gypsum before it enters the flash drying airflow field, so as to make the material structure more conducive to subsequent crushing, dispersion and moisture migration, thereby improving the overall drying efficiency and the stability of the finished product quality.

[0006] Therefore, a drying mechanism for the preparation of α-type high-strength gypsum is provided to address the above-mentioned problems. Summary of the Invention

[0007] This invention addresses the problems of high moisture content, dense agglomeration, difficulty in breaking and dispersing, and low drying efficiency in the initial stage of flash drying of filter cake-shaped α-type high-strength gypsum, and provides a drying mechanism for the preparation of α-type high-strength gypsum.

[0008] The present invention solves the above-mentioned technical problems through the following technical solutions: The present invention provides a drying mechanism for the preparation of α-type high-strength gypsum, including an air outlet assembly, which is connected and communicates with a stirring and crushing assembly through a heating assembly. The top of the stirring and crushing assembly is connected to a drying shell arranged vertically. The drying shell is connected to a receiving assembly through a discharge port on its top outer wall. The stirring and crushing assembly is provided with a feeding shell, and the feeding shell is connected to a spiral feeding structure. The mixing and crushing component has a pre-treatment structure inside. The pre-treatment structure flattens the material that enters the mixing and crushing component from the feed shell. The flattened material is then crushed and mixed.

[0009] The material entering the mixing and crushing assembly is pre-processed by flattening the feed shell, allowing the wet material to be flattened first, thus enabling faster crushing and mixing. Simultaneously, the flattening process directly squeezes out some free water, thereby accelerating the drying process.

[0010] In this technical solution, the air outlet assembly includes a fan, which is connected to the heating assembly through an air guide shell. The heating assembly includes a mounting shell, and a heating unit is installed inside the mounting shell. The fan is connected to the mounting shell through the air guide shell. The airflow generated by the blower passes through the heating unit and then enters the mixing and crushing assembly through the connecting shell.

[0011] An air intake filter unit for filtering impurities in the air is fixed on the air intake end of the fan.

[0012] The airflow generated by the air outlet component passes through the heating component to form a hot airflow, which then enters the mixing shell, the drying shell, and the receiving component connected to the drying shell in sequence.

[0013] In this technical solution, the mixing and crushing component includes a flat cylindrical mixing shell. The connection between the mixing shell and the heating component is distributed along the tangential direction of the mixing shell, that is, the axis of the connecting shell is parallel or coincident with a certain tangential direction of the mixing shell, so that hot air can enter the interior of the mixing shell from the tangential direction. A mixing unit is provided in the bottom area of ​​the inner cavity of the mixing shell, and a drying shell is fixed at the top center of the mixing shell. The drying shell is cylindrical. The mixing unit mixes and crushes the material after it has been flattened by the pretreatment structure. A support is fixed to the bottom of the mixing shell.

[0014] A grading ring is installed on the inner wall of the drying shell at the bottom of the discharge pipe.

[0015] In this technical solution, the stirring unit includes a driving component, which is fixed on a bracket at the bottom of the stirring shell. A driving rod is fixed on the output end at the top of the driving component. The driving rod passes through the bottom side wall of the stirring shell, and a first stirring blade and a second stirring blade are fixed on the surface of the driving rod.

[0016] In this technical solution, the bottom sidewall of the inner cavity of the stirring shell protrudes upward to form a conical structure. The first stirring blade is also a conical structure and is located at the top of the conical surface at the bottom of the inner cavity of the stirring shell. There are at least two second stirring blades, and the second stirring blades are polygonal star-shaped, with two adjacent second stirring blades staggered.

[0017] The preferred driving component is a motor, which is mounted on a bracket. The motor is fixedly connected to the drive rod via a coupling or other existing and suitable connecting components. The motor drives the drive rod to rotate, which in turn drives the first and second stirring blades to rotate. The rotating first and second stirring blades crush and stir the material, which is then dried in conjunction with hot air.

[0018] In this technical solution, the pretreatment structure is located at the bottom of the feed shell and connected to the top of the stirring unit, rotating synchronously with the stirring unit. Specifically, the pretreatment structure is fixed to the top of the drive shaft. The preprocessing structure is either a first preprocessing component or a second preprocessing component.

[0019] In this technical solution, the first pretreatment component includes a first transmission rod, which is fixed vertically to the top of the drive rod. At least one flattening part is fixed on the surface of the first transmission rod. The flattening part rotates with the first transmission rod and passes through a receiving plate. The receiving plate is fixed on the inner wall of the drying shell on one side of the bottom of the feeding shell. After passing the receiving plate, the rotating flattening part first flattens the material on the receiving plate and then scrapes it off, so that it falls onto the mixing unit.

[0020] The receiving plate is located below the feed shell. Material entering the drying shell through the feed shell falls directly onto the receiving plate or onto its attachments.

[0021] The rotating flattening section first flattens the material on the surface of the receiving plate or pushes the material falling near the receiving plate onto the receiving plate, and then flattens it. Subsequently, the scraper directly scrapes the material off the flattening plate.

[0022] In this technical solution, the flattening part includes a grinding unit and a scraping unit, and the grinding unit and the scraping unit are fixed on the first transmission rod by the first connecting rod; The rotating grinding unit and scraping unit pass sequentially through the top and bottom side walls of the receiving plate.

[0023] Specifically, the direction of rotation of the drive rod is from the scraping unit to the flattening unit.

[0024] In this technical solution, the grinding unit includes two grinding plates symmetrically arranged with the receiving plate as the symmetrical face. The two grinding plates are fixedly connected by a first connecting frame, and the two grinding plates pass over the bottom and bottom of the receiving plate respectively. When passing over the receiving plate, there is always a gap between the grinding plate and the corresponding outer wall of the receiving plate.

[0025] The grinding plate rotates with the drive rod, and the rotating grinding plate spreads the material evenly on the receiving plate.

[0026] The grinding plate is preferably set at an angle.

[0027] In this technical solution, the scraping unit includes two bearing plates symmetrically arranged with the receiving plate as the symmetrical face. Scrapers are rotatably connected to the opposite end faces of the two bearing plates. A coil spring is provided at the rotatable connection between the scraper and the bearing plate, and the two ends of the coil spring act on the scraper and the bearing plate respectively. The two scraper plates rotate as they pass over the top and bottom of the receiving plate, and always overlap the corresponding outer wall of the receiving plate. The two bearing plates are fixedly connected to each other by the second connecting frame. The thickness of the receiving plate gradually increases along the rotation direction of the stirring section, and two symmetrically arranged inclined surfaces are formed on the top and bottom side walls of the receiving plate.

[0028] When the scraper rotates to the receiving plate, it begins to rotate. Due to the presence of the inclined surface, the scraper gradually rotates, but it always overlaps with or has a small gap with the surface of the receiving plate, while pushing the material to move, thereby scraping off the material from the surface of the receiving plate.

[0029] Because the surface of the receiving plate is inclined, the scraper and the grinding plate exert a squeezing effect on the material when they move on the surface of the receiving plate, thereby squeezing out some free water.

[0030] Preferably, the surface of the mounting groove is covered with a soft protective sleeve to prevent the connecting sleeve, connecting horizontal shaft and coil spring from coming into direct contact with the material.

[0031] The first connecting frame and the second connecting frame are connected to each other by rods, and the first connecting frame or the second connecting frame is fixed to the first transmission rod by the first connecting rod.

[0032] In this technical solution, the second pretreatment component includes an outer shell and an inner shell arranged coaxially. The outer shell and the inner shell are annular or not completely annular. The outer shell is sleeved and fixed on the inner wall of the drying shell. The inner shell is fixed on the second transmission rod by at least two second connecting rods. The second transmission rod is fixed vertically on the top of the drive rod. The outer shell and the inner shell together form a ring-shaped pretreatment cavity. The pretreatment cavity is located at the bottom of the feed shell, and at least one pushing unit is provided inside the pretreatment cavity. The pushing unit rotates synchronously with the inner shell and the drive rod.

[0033] The material is squeezed and flattened by the rotating pusher unit.

[0034] In this technical solution, the distance between the outer wall of the pusher unit and the outer shell gradually increases from one end to the other, and the direction in which the distance between the outer wall of the pusher unit and the outer shell gradually increases is the rotation direction of the drive shaft.

[0035] The pushing unit includes a connecting plate, with a feeding plate and a pushing plate fixed on both sides of the connecting plate respectively. The distance between the outer wall of the feeding plate and the inner wall of the outer shell gradually increases from the side closer to the connecting plate to the side farther away from the connecting plate, and the distance between the outer wall of the pushing plate and the inner wall of the outer shell gradually decreases from the side closer to the connecting plate to the side farther away from the connecting plate. Furthermore, the vertical projections of the connecting plate, the feeding plate, and the pushing plate are all fan-shaped structures, and the vertical projection of the connecting plate is concentric with the drive rod.

[0036] In this technical solution, the middle areas of the connecting plate, the feeding plate, and the pushing plate all bulge towards the outer shell to form a bent structure, which can squeeze the material to both sides when flattening the material.

[0037] At the same time, the bending shape can guide the material into the space between the pusher unit and the outer shell.

[0038] When the pushing unit rotates, the material first enters the gap between the feeding plate and the outer shell. As the pushing unit continues to move, the material is successively rolled over by the feeding plate, the connecting plate and the pushing plate. As the gap gradually decreases, the material can be flattened.

[0039] Preferably, the inner shell can be omitted, allowing the second connecting rod to be directly connected to the pushing unit, thus avoiding the inner shell from affecting the material's ascent.

[0040] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0041] The positive and progressive effects of this invention are as follows: By setting up a pre-treatment flattening structure before the material enters the mixing and crushing assembly, the filter cake-like or lumpy wet material entering the equipment is first spread into a thinner, more loosely structured sheet or thin layer during the pre-treatment stage. On the one hand, the flattening treatment significantly increases the force-bearing contact area and specific surface area of ​​the material, reducing the overall structural strength during subsequent crushing and shearing. This makes it easier for the material to be quickly disintegrated and dispersed after entering the mixing and crushing zone, improving the response efficiency and uniformity of the crushing and mixing process, and reducing the risk of large particles or wet lumps remaining.

[0042] On the other hand, under the action of rolling pressure, some of the free water contained inside the material is preferentially squeezed out, further opening the capillary channels inside the filter cake. The overall moisture content of the material is initially reduced before entering the flash drying airflow field. This mechanical water squeezing behavior effectively reduces the evaporation load in the subsequent drying stage, shortens the moisture migration path, and makes the heat and mass transfer process more complete, thereby accelerating the diffusion and evaporation rate of moisture to the surface and improving the thermal efficiency and transient drying capacity of the drying stage.

[0043] In summary, the pretreatment and flattening structure has a synergistic effect on both the crushing and dispersion and mass transfer drying stages: it improves the crushing plasticity and dispersion uniformity of wet materials, and reduces the flash drying burden by removing some free water in advance. This can effectively improve the overall efficiency of the combined operation of mixing crushing and airflow drying, shorten the drying cycle, and improve the drying uniformity and stability of the finished product. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A structural diagram from another perspective; Figure 3 This is a schematic diagram of the internal structure of a portion of the present invention; Figure 4 This is a schematic diagram of the stirring section of the present invention; Figure 5 This is a schematic diagram of the state structure of the first pretreatment component of the present invention when it is located inside the stirring shell; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point I; Figure 7 This is a schematic diagram of the structure of the first preprocessing component of the present invention; Figure 8 For the present invention Figure 7 A structural diagram from another perspective; Figure 9 This is a schematic diagram of the structure of the grinding unit and the scraping unit of the present invention; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure at point J; Figure 11 This is a schematic diagram of the state structure of the second pretreatment component of the present invention when it is located inside the stirring shell; Figure 12 This is a schematic diagram of the structure of the second pretreatment component of the present invention; Figure 13 This is a schematic diagram of the structure of the second pretreatment component after the blanking outer shell of the present invention; Figure 14This is a schematic diagram of the feeding unit of the present invention; Figure 15 For the present invention Figure 12 A top-view structural diagram; Figure 16 For the present invention Figure 15 A three-dimensional structural diagram of section AA.

[0045] Explanation of reference numerals in the attached figures 1. Air outlet assembly; 11. Air intake filter unit; 12. Fan; 13. Air guide shell; 2. Heating assembly; 21. Mounting housing; 22. Connecting housing; 23. Heating unit; 3. Mixing shell; 31. Support; 32. Boss; 33. Drive component; 34. Drive rod; 35. First mixing blade; 36. Second mixing blade; 4. Drying shell; 41. Discharge port; 5. Feed shell; 6. First pretreatment component; 61. First transmission rod; 62. First connecting rod; 63. Receiving plate; 64. Grinding unit; 641. First connecting frame; 642. Grinding plate; 65. Scraping unit; 651. Second connecting frame; 652. Bearing plate; 653. Scraper; 654. Connecting sleeve; 655. Connecting crossbar; 7. Second pretreatment component; 71. Outer shell; 72. Second transmission rod; 73. Second connecting rod; 74. Inner shell; 75. Pushing unit; 751. Connecting plate; 752. Feeding plate; 753. Pushing plate. Detailed Implementation

[0046] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0047] like Figure 1 and Figure 2 As shown, the drying mechanism for preparing α-type high-strength gypsum includes an air outlet assembly 1, which is connected and communicates with the stirring and crushing assembly through the heating assembly 2. The top of the stirring and crushing assembly is connected to a vertically arranged drying shell 4, which is connected to the receiving assembly through the discharge port 41 on its top outer wall. The stirring and crushing assembly is provided with a feeding shell 5, which is connected to a spiral feeding structure. The mixing and crushing component has a pre-treatment structure inside. The pre-treatment structure flattens the material that enters the mixing and crushing component from the feed shell 5. The flattened material is then crushed and mixed.

[0048] Example 1 In this embodiment, as Figure 3As shown, the air outlet assembly 1 includes a fan 12, which is connected to the heating assembly 2 through the air guide shell 13. The heating assembly 2 includes a mounting shell 21, and a heating unit 23 is disposed inside the mounting shell 21. The fan 12 is connected to the mounting shell 21 through the air guide shell 13. The airflow generated by the blower 12 passes through the heating unit 23 and then enters the mixing and crushing assembly through the connecting shell 22.

[0049] An air intake filter unit 11 for filtering impurities in the air is fixed on the air intake end of the fan 12.

[0050] The airflow generated by the air outlet component 1 passes through the heating component 2 to form a hot airflow, which then enters the stirring shell 3, the drying shell 4, and the receiving component connected to the drying shell 4 in sequence.

[0051] In this technical solution, the fan 12 and the heating unit 23 both adopt the common supporting equipment of flash dryers in the prior art. The receiving component is a common cyclone separator, which is used to receive the dried α-type high-strength gypsum particles. The exhaust gas is also filtered through existing and suitable filtration equipment before being discharged into the external environment.

[0052] Since the entire receiving assembly is based on existing technology, it is not shown in the figure.

[0053] The mixing and crushing assembly includes a flat cylindrical mixing shell 3. The connection between the mixing shell 3 and the heating assembly 2 is distributed along the tangential direction of the mixing shell 3. That is, the axis of the connecting shell 22 is parallel or coincident with a certain tangential direction of the mixing shell 3, so that hot air can enter its interior from the tangential direction of the mixing shell 3. A mixing unit is provided in the bottom area of ​​the inner cavity of the mixing shell 3, and a drying shell 4 is fixed at the top center of the mixing shell 3. The drying shell 4 is cylindrical. The mixing unit mixes and crushes the material after it has been flattened by the pre-treatment structure. A support 31 is fixed to the bottom of the stirring shell 3.

[0054] The hot air generated by the blower 12 and the heating unit 23 enters the inner cavity of the mixing shell 3 tangentially, and rises axially along the drying shell 4, pushing the α-type high-strength gypsum particles upward. A grading ring is set on the inner wall of the drying shell 4 at the bottom of the discharge pipe 41. Particles that are sufficiently dried pass through the grading ring and enter the receiving assembly through the discharge pipe 41. Particles that do not meet the standards fall down and continue to be dried by hot air until they can pass through the grading ring.

[0055] like Figure 3 and Figure 4 As shown, the stirring unit includes a driving component 33, which is fixed on a bracket 31 at the bottom of the stirring shell 3. A driving rod 34 is fixed on the output end at the top of the driving component 33. The driving rod 34 passes through the bottom side wall of the stirring shell 3, and a first stirring blade 35 and a second stirring blade 36 are fixed on the surface of the driving rod 34.

[0056] The bottom sidewall of the inner cavity of the stirring shell 3 protrudes upward to form a conical structure. The first stirring blade 35 is also a conical structure and is located at the top of the conical surface at the bottom of the inner cavity of the stirring shell 3. There are at least two second stirring blades 36, and the second stirring blades 36 are polygonal star-shaped, with two adjacent second stirring blades 36 arranged alternately.

[0057] The drive component 33 is preferably a motor, which is mounted on the bracket 31. The motor is fixedly connected to the drive rod 34 via a coupling or other existing and suitable connecting parts. The motor drives the drive rod 34 to rotate, thereby driving the first stirring blade 35 and the second stirring blade 36 to rotate. The rotating first stirring blade 35 and the second stirring blade 36 crush and stir the material, and dry it with hot air.

[0058] Example 2 The pretreatment structure is located at the bottom of the feed shell 5 and connected to the top of the stirring unit, rotating synchronously with the stirring unit. Specifically, the pretreatment structure is fixed to the top of the drive shaft. The preprocessing structure is either the first preprocessing component 6 or the second preprocessing component 7.

[0059] like Figures 5-10 As shown, the first pretreatment component 6 includes a first transmission rod 61, which is fixed vertically to the top of the drive rod 34. At least one flattening part is fixed on the surface of the first transmission rod 61. The flattening part rotates with the first transmission rod 61 and passes through the receiving plate 63. The receiving plate 63 is fixed on the inner wall of the drying shell 4 on one side of the bottom of the feeding shell 5. After passing the receiving plate 63, the rotating flattening part first flattens the material on the receiving plate 63 and then scrapes it off, so that it falls onto the mixing unit.

[0060] The receiving plate 63 is located below the feeding shell 5. The material entering the drying shell 4 through the feeding shell 5 falls directly onto the receiving plate 63 or onto the attachment of the receiving plate 63.

[0061] The rotating flattening section first flattens the material on the surface of the receiving plate 63 or pushes the material falling near the receiving plate 63 onto the receiving plate 63, and then flattens it. Subsequently, the scraper 653 directly scrapes the material off the flattening plate.

[0062] The flattening section includes a grinding unit 64 and a scraping unit 65, which are fixed to the first transmission rod 61 by a first connecting rod 62. The rotating grinding unit 64 and scraping unit 65 pass sequentially through the top and bottom side walls of the receiving plate 63.

[0063] Specifically, the rotation direction of the drive rod 34 is from the scraping unit 65 to the flattening unit.

[0064] The grinding unit 64 includes two grinding plates 642 symmetrically arranged with the receiving plate 63 as the symmetrical face. The two grinding plates 642 are fixedly connected by a first connecting frame 641, and the two grinding plates 642 pass over the bottom and bottom of the receiving plate 63 respectively. When passing over the receiving plate 63, there is always a gap between the grinding plate 642 and the corresponding outer wall of the receiving plate 63.

[0065] The grinding plate rotates with the drive rod 34, and the rotating grinding plate spreads the material evenly on the receiving plate 63.

[0066] The grinding plate is preferably set at an angle.

[0067] The scraping unit 65 includes two support plates 652 arranged symmetrically with the receiving plate 63 as the symmetrical face. Scrapers 653 are rotatably connected to the opposite end faces of the two support plates 652. A coil spring is provided at the rotatable connection between the scraper 653 and the support plate 652, and the two ends of the coil spring act on the scraper 653 and the support plate 652 respectively. The two scraper plates rotate as they pass the top and bottom of the receiving plate 63, and always overlap the corresponding outer wall of the receiving plate 63. The two bearing plates 652 are fixedly connected to each other by the second connecting frame 651. The thickness of the receiving plate 63 gradually increases along the rotation direction of the stirring part, and two symmetrically arranged inclined surfaces are formed on the top and bottom side walls of the receiving plate 63.

[0068] When the scraper plate rotates to the receiving plate 63, the scraper plate starts to rotate. Due to the existence of the inclined surface, the scraper plate 653 gradually rotates, but it always overlaps with the surface of the receiving plate 63 or the gap is small, while pushing the material to move, thereby scraping off the material on the surface of the receiving plate 63.

[0069] Because the surface of the receiving plate 63 is inclined, the scraper and the grinding plate exert a squeezing effect on the material when they move on the surface of the receiving plate 63, thereby squeezing out a portion of the free water.

[0070] Preferably, an installation groove is provided on one of the side walls of the bearing plate 652 and the corresponding scraper 653. A connecting crossbar 655 is fixed on the installation groove. A connecting sleeve 654 is sleeved on the surface of the connecting crossbar 655. The connecting sleeve 654 can rotate on the surface of the connecting crossbar 655. The connecting sleeve 654 is fixed on the bearing plate 652 or the corresponding scraper 653 without an installation groove.

[0071] Specifically, the coil spring is sleeved on the connecting crossbar 655, and the two ends of the coil spring are fixed to the connecting crossbar 655 and the connecting sleeve 654 respectively.

[0072] Preferably, the surface of the mounting groove is covered with a soft protective sleeve to prevent the connecting sleeve 654, the connecting horizontal shaft, and the coil spring from coming into direct contact with the material.

[0073] The first connecting frame 641 and the second connecting frame 651 are connected to each other by rods, and the first connecting frame 641 or the second connecting frame 651 is fixed on the first transmission rod 61 by the first connecting rod 62.

[0074] like Figures 11-16 As shown, the second pretreatment component 7 includes an outer shell 71 and an inner shell 74 arranged coaxially. The outer shell 71 and the inner shell 74 are annular or not completely annular. The outer shell 71 is sleeved and fixed on the inner wall of the drying shell 4. The inner shell 74 is fixed on the second transmission rod 72 by at least two second connecting rods 73. The second transmission rod 72 is fixed vertically on the top of the drive rod 34. The outer shell 71 and the inner shell 74 together form a pretreatment cavity with an annular structure. The pretreatment cavity is located at the bottom of the feed shell 5, and at least one pusher unit 75 is provided inside the pretreatment cavity. The pusher unit 75 rotates synchronously with the inner shell 74 and the drive rod 34.

[0075] The material is squeezed and flattened by the rotating pusher unit 75.

[0076] The distance between the outer wall of the pusher unit 75 and the outer shell 71 gradually increases from one end to the other, and the direction in which the distance between the outer wall of the pusher unit 75 and the outer shell 71 gradually increases is the rotation direction of the drive shaft.

[0077] The feeding unit 75 includes a connecting plate 751. A feeding plate 752 and a feeding plate 753 are fixed on both sides of the connecting plate 751 respectively. The distance between the outer wall of the feeding plate 752 and the inner wall of the outer shell 71 gradually increases from the side closer to the connecting plate 751 to the side farther away from the connecting plate 751. The distance between the outer wall of the feeding plate 753 and the inner wall of the outer shell 71 gradually decreases from the side closer to the connecting plate 751 to the side farther away from the connecting plate 751. Furthermore, the vertical projections of the connecting plate 751, the feeding plate 752, and the pushing plate 753 are all fan-shaped structures, and the vertical projection of the connecting plate 751 is concentric with the drive rod 34.

[0078] The middle areas of the connecting plate 751, the feeding plate 752 and the pushing plate 753 all bulge towards one side of the outer shell 71 to form a bent structure, which can squeeze the material to both sides when flattening the material.

[0079] At the same time, the bending shape allows the material to enter between the pusher unit 75 and the outer shell 71. When the pushing unit 75 rotates, the material first enters the gap between the feeding plate 752 and the outer shell 71. The pushing unit 75 continues to move, and the material is rolled over by the feeding plate 752, the connecting plate 751 and the pushing plate 753 in sequence. As the gap gradually decreases, the material can be flattened.

[0080] Preferably, the inner shell 74 can be omitted, so that the second connecting rod 73 is directly connected to the pushing unit 75, thus avoiding the inner shell 74 from affecting the material rising.

[0081] When the inner shell 74 and the outer shell 71 are not completely annular, that is, the outer shell 71 is only located on the inner wall of the drying shell 4 below the feed shell 5, and has an arc-shaped structure, it is preferable to omit the inner shell 74 in this case.

[0082] In this application, the surfaces of all components of the pretreatment structure that come into contact with the material are coated with an anti-stick coating.

[0083] The anti-stick coating is preferably one of Ni-P-PTFE electroless composite coating and tungsten carbide (WC-Co) hard coating.

[0084] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A drying mechanism for preparing α-type high-strength gypsum, comprising an air outlet assembly (1), wherein the air outlet assembly (1) is connected to a stirring and crushing assembly via a heating assembly (2), the top of the stirring and crushing assembly is connected to a vertically arranged drying shell (4), the drying shell (4) is connected to a receiving assembly via a discharge port (41) on its top outer wall, and the stirring and crushing assembly is provided with a feeding shell (5), the feeding shell (5) being externally connected to a spiral feeding structure, characterized in that: The mixing and crushing assembly is provided with a pretreatment structure inside. The pretreatment structure flattens the material that enters the mixing and crushing assembly from the feed shell (5). The flattened material is crushed and mixed.

2. The drying mechanism for preparing α-type high-strength gypsum as described in claim 1, characterized in that: The air outlet assembly (1) includes a fan (12), which is connected to the heating assembly (2) through a guide shell (13). The heating assembly (2) includes a mounting shell (21), and a heating unit (23) is provided inside the mounting shell (21). The fan (12) is connected to the mounting shell (21) through the guide shell (13). The airflow generated by the fan (12) passes through the heating unit (23) and then enters the mixing and crushing assembly through the connecting shell (22).

3. The drying mechanism for preparing α-type high-strength gypsum as described in claim 1, characterized in that: The mixing and crushing assembly includes a flat cylindrical mixing shell (3). The connection between the mixing shell (3) and the heating assembly (2) is distributed along the tangential direction of the mixing shell (3). A mixing unit is provided in the bottom area of ​​the inner cavity of the mixing shell (3), and a drying shell (4) is fixed at the top center of the mixing shell (3). The drying shell (4) is cylindrical. The mixing unit mixes and crushes the material after it has been flattened by the pre-treatment structure.

4. The drying mechanism for preparing α-type high-strength gypsum as described in claim 3, characterized in that: The stirring unit includes a driving component (33), which is fixed on a bracket (31) at the bottom of the stirring shell (3). A driving rod (34) is fixed on the output end at the top of the driving component (33). The driving rod (34) penetrates the bottom side wall of the stirring shell (3), and a first stirring blade (35) and a second stirring blade (36) are fixed on the surface of the driving rod (34).

5. The drying mechanism for preparing α-type high-strength gypsum as described in claim 3, characterized in that: The pretreatment structure is located at the bottom of the feed shell (5) and connected to the top of the stirring unit, rotating synchronously with the stirring unit; The preprocessing structure is either a first preprocessing component (6) or a second preprocessing component (7).

6. The drying mechanism for preparing α-type high-strength gypsum as described in claim 5, characterized in that: The first pretreatment component (6) includes a first transmission rod (61), which is fixed vertically to the top of the drive rod (34). At least one flattening part is fixed on the surface of the first transmission rod (61), which rotates with the first transmission rod (61) and passes through the receiving plate (63).

7. The drying mechanism for preparing α-type high-strength gypsum as described in claim 6, characterized in that: The flattening section includes a grinding unit (64) and a scraping unit (65), which are fixed to the first transmission rod (61) by a first connecting rod (62); The rotating grinding unit (64) and scraping unit (65) pass sequentially through the top and bottom sidewalls of the receiving plate (63).

8. The drying mechanism for preparing α-type high-strength gypsum as described in claim 7, characterized in that: The grinding unit (64) includes two grinding plates (642) arranged symmetrically with the receiving plate (63) as the symmetrical face. The two grinding plates (642) are fixedly connected by a first connecting frame (641), and the two grinding plates (642) pass over the bottom and bottom of the receiving plate (63) respectively. When passing over the receiving plate (63), there is always a gap between the grinding plate (642) and the outer wall of the receiving plate (63).

9. The drying mechanism for preparing α-type high-strength gypsum as described in claim 7, characterized in that: The scraping unit (65) includes two support plates (652) symmetrically arranged with the receiving plate (63) as the symmetrical face. Scrapers (653) are rotatably connected to the opposite end faces of the two support plates (652). A coil spring is provided at the rotatable connection between the scraper (653) and the support plate (652). The two scraper plates rotate as they pass the top and bottom of the receiving plate (63) and always overlap the outer wall of the receiving plate (63). The two bearing plates (652) are fixedly connected to each other by the second connecting frame (651). The thickness of the receiving plate (63) gradually increases along the rotation direction of the stirring section.

10. The drying mechanism for preparing α-type high-strength gypsum as described in claim 5, characterized in that: The second pretreatment component (7) includes an outer shell (71) and an inner shell (74) arranged coaxially. The outer shell (71) and the inner shell (74) are annular or not completely annular. The outer shell (71) is sleeved and fixed on the inner wall of the drying shell (4). The inner shell (74) is fixed on the second transmission rod (72) by at least two second connecting rods (73). The second transmission rod (72) is fixed vertically on the top of the drive rod (34). The outer shell (71) and the inner shell (74) together form a pretreatment cavity with an annular structure. The pretreatment cavity is located at the bottom of the feed shell (5), and at least one pusher unit (75) is provided inside the pretreatment cavity. The pusher unit (75) rotates synchronously with the inner shell (74) and the drive rod (34).

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