A gypsum powder calcining device with an anti-powder return hood and an automatic control method thereof

Abstract

The present invention discloses a gypsum powder calcining device with an anti-powder return hood and an automatic control method thereof, belonging to the technical field of gypsum powder processing, and comprising a bottom plate, the upper surface of the bottom plate is fixedly connected to the lower surface of a combustion tube through six supporting legs, the upper surface of the combustion tube is fixedly connected to the lower surface of a support frame, a controller is arranged on the front of the support frame, and a combustion mechanism is arranged on the top of the support frame. In the present invention, by arranging a combustion tube, an inner tube, an air guide assembly, a gas distribution plate and an air hood assembly, the cap box moves downward rapidly and contacts the gas distribution plate, thereby preventing the material from entering the exhaust hole, even if part of the material is placed on the transverse air duct and the longitudinal air duct, when the air pressure in the cap box increases, the cap box moves upward, expanding the gap between the transverse air duct and the longitudinal air duct and the cap box, effectively flushing the material out again, and no blockage of the gas distribution plate occurs, reducing the workload while not affecting the calcining effect.

Description

Technical Field

[0001] The invention belongs to the technical field of gypsum powder processing, and specifically relates to a gypsum powder calcining device with an anti-powder return hood and an automatic control method thereof. Background Art

[0002] Gypsum powder is usually white and colorless. The colorless and transparent crystals are called transparent gypsum. Sometimes it is gray, light yellow, light brown and other colors due to impurities. The streak is white, transparent, and glassy. The cleavage surface is pearly. The fibrous aggregate is silky. The cleavage is very complete and medium. The cleavage pieces are split into rhombuses with angles of 66 and 114. It is widely used in many application fields such as construction, building materials, industrial molds and art models, chemical industry, agriculture, food processing, and medical beauty. It is an important industrial raw material.

[0003] At present, in the production and processing of gypsum powder, in order to improve the calcination efficiency and calcination effect of gypsum powder, it is usually necessary to load a mixing mechanism in the combustion chamber to realize the fluidization of gypsum powder, and introduce gas into the combustion chamber through aeration and mixing to make the gypsum powder in a flowing state. A plurality of exhaust holes are opened on the gas distribution plate to guide the air, which causes the gas distribution plate to accumulate and form walls due to long-term work, and is prone to blockage of the exhaust holes, requiring frequent disassembly and cleaning, increasing its maintenance cost. At the same time, when the high-pressure air supply is stopped, due to the instantaneous pressure difference, part of the fluidized gypsum powder material is backflowed into the bellows through the exhaust holes, affecting its normal air supply. Furthermore, based on the large-particle gypsum powder material being rushed into the exhaust holes by pressure, it is still very easy to cause blockage of the exhaust holes, affecting the calcination effect. Therefore, a gypsum powder calcining device with an anti-powder return hood is needed to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a gypsum powder calcining device with an anti-powder return hood and an automatic control method thereof, which solves the problem that gas is introduced into the combustion chamber by aeration and mixing to make the gypsum powder flow, and a plurality of exhaust holes are opened on the gas distribution plate to guide the air, which causes the gas distribution plate to accumulate and form a wall due to long-term work, and is prone to blockage of the exhaust holes, requiring frequent disassembly and cleaning, increasing its maintenance cost. At the same time, when the high-pressure air supply is stopped, due to the instantaneous pressure difference, part of the fluidized gypsum powder material is caused to flow back into the bellows through the exhaust holes, affecting its normal air supply. Furthermore, based on the large-particle gypsum powder material being rushed into the exhaust holes by pressure, it is still very easy to block the exhaust holes, affecting the calcination effect.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gypsum powder calcining device with an anti-powder return hood, comprising a base plate, the upper surface of the base plate is fixedly connected to the lower surface of the combustion tube through six supporting legs, the upper surface of the combustion tube is fixedly connected to the lower surface of the support frame, a controller is arranged on the front of the support frame, a combustion mechanism is arranged on the top of the support frame, the bottom ends of the combustion mechanisms are all clamped on the combustion tube, an inner tube is arranged in the combustion tube, the upper surface of the inner wall of the support frame is fixedly connected to the top of the driving assembly, the driving assembly is meshed with four gears, the lower surface of the gear is fixedly connected to the top of the screw rod, the outer wall of the screw rod is arranged in the inner tube through a bearing, and an air guide rod is arranged between the four screw rods.

[0008] The bottom end of the air guide rod passes through the inner tube and the combustion tube and is connected with the top of the air guide assembly. The upper and lower surfaces of the air guide assembly are fixedly connected to the opposite surfaces of the combustion tube and the bottom plate, respectively. The outer wall of the air guide rod is provided with a plurality of gas distribution plates. The upper surface of the gas distribution plate is provided with two hood assemblies. The left and right sides of the hood assembly are respectively provided with transverse air ducts and longitudinal air ducts, and the transverse air ducts and longitudinal air ducts are both opened on the upper surface of the gas distribution plate. An air inlet is provided below the hood assembly, and the air inlet is opened on the upper surface of the gas distribution plate. The air inlet is connected with a cavity, and the cavity is arranged in the gas distribution plate. A feed valve and a discharge valve are respectively provided above and below the back of the combustion tube.

[0009] As a further solution of the present invention: the top and bottom of the inner tube are fixedly connected with partitions, and the sides of the two partitions away from each other are respectively fixedly connected to the top and bottom of the inner wall of the combustion tube, the partitions are set as high-temperature resistant insulation pads, and the outer wall of the inner tube and the inner wall of the combustion tube are designed to be vacuum.

[0010] As a further solution of the present invention: the combustion mechanism includes a burner, the lower surface of the burner is fixedly connected to the upper surface of the support frame, the output end of the burner is connected to four conducting pipes, the bottom end of the conducting pipe is provided with an injector, and the four injectors are all clamped on the combustion tube and extend into the inner tube.

[0011] As a further solution of the present invention: the driving assembly includes a motor, the upper surface of the motor body is fixedly connected to the upper surface of the inner wall of the support frame, the output shaft of the motor is fixedly connected to the upper surface of the gear plate, and the gear plate is meshed with four gears.

[0012] As a further solution of the present invention: the air guide assembly includes a bellows, the upper surface of the bellows is fixedly connected to the lower surface of the combustion tube, the lower surface of the bellows is fixedly connected to the upper surface of the base plate, the top of the bellows is connected to the bottom end of the air guide rod, the back of the bellows is connected to the output end of the fan, and the lower surface of the fan body is fixedly connected to the upper surface of the base plate.

[0013] As a further solution of the present invention: the hood assembly includes a hat box, the lower surface of the hat box overlaps with the upper surface of the gas distribution plate, the top of the inner wall of the hat box is provided with a guide groove, the guide groove is of conical design, the inner wall of the hat box is provided with four exhaust holes, the exhaust holes are of inclined design, the middle part of the inner wall of the hat box is clamped with a guide plate, the upper part of the outer wall of the guide plate is of inclined design, the top of the inner wall of the guide groove is fixedly connected to the top end of the elastic hydraulic rod, and the bottom end of the elastic hydraulic rod is fixedly connected to the lower surface of the inner wall of the cavity through a column.

[0014] As a further solution of the present invention: the bottom end of the toothed disc passes through the combustion cylinder and the inner cylinder and is fixedly connected to one end of the two mixing components, the mixing component includes a rotating rod, one end of the rotating rod is fixedly connected to the bottom end of the toothed disc, the outer wall of the rotating rod is provided with a plurality of stirring heads, and the bottom ends of the two rotating rods are arranged on the outer wall of the air guide rod through the same shaft sleeve.

[0015] An automatic control method for a gypsum powder calcining device with an anti-powder return hood comprises the following steps:

[0016] S1. When calcining gypsum powder, it is poured into the inner cylinder through the feed valve, and the motor is controlled by the controller. The output end of the motor drives the toothed disc to rotate, and the toothed disc is meshed with four gears, so that the four gears drive the four screw rods to rotate synchronously. The screw rods drive the material upward during the rotation.

[0017] S2. At the same time, the toothed disc drives the two rotating rods at the bottom to rotate, so that the multiple stirring heads on the rotating rods can fully stir the materials. Since the spiral rod transports the materials upward and mixes the materials again through the stirring heads, the materials are always in a flowing state in the content, and the materials are broken and mixed.

[0018] S3. During the material mixing process, after the motor has worked for 10-15 minutes, the controller starts the fan and burner to work, so that the gas enters the air guide rod through the bellows, and the air guide rod distributes the gas to the cavities of multiple gas distribution plates. When the gas in the cavity increases, the gas squeezes the hat box through the air inlet, and the guide groove on the top of the hat box is conical in design, which effectively disperses the gas from all sides and enters the exhaust hole.

[0019] S4. When the air pressure in the hat box continues to increase and can push the hat box upward, a gap will appear between the hat box and the gas distribution plate, allowing the gas to be discharged from the gap and guided through multiple transverse and longitudinal air ducts to disperse the gas from all sides of the gas distribution plate, thereby achieving the purpose of aerating and mixing the materials in the inner cylinder and further increasing the fluidity of the materials. At the same time, after the burner works, the heat source is sprayed through four injectors to calcine the materials in the inner cylinder.

[0020] S5. When the calcination time reaches the preset time, the controller automatically controls the burner to stop working, while the motor and air pump continue to work to ensure that the material is heated evenly. When the motor and fan meet the working time, the fan and motor are powered off to stop the high-pressure air supply. There is an instantaneous pressure difference in the inner cylinder. At this time, the air pressure in the hat box drops rapidly. The cooperation between the inclined exhaust holes and the guide plate makes it difficult for the material to rush into the gas distribution plate. Further, through the contraction tension of the elastic hydraulic rod, the hat box moves downward rapidly and contacts the gas distribution plate, thereby preventing the material from entering the exhaust holes. Even if part of the material is placed on the horizontal and longitudinal air ducts, when the air pressure in the hat box increases, the hat box moves upward, expanding the gap between the horizontal and longitudinal air ducts and the hat box, effectively flushing the material out again.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, by arranging a combustion cylinder, an inner cylinder, an air guide assembly, a gas distribution plate and a hood assembly, during the calcination of the material, the working gas of the fan enters into the air guide rod through the bellows, and the air guide rod distributes the gas to the cavities of multiple gas distribution plates. When the gas in the cavity increases, the gas squeezes the cap box through the air inlet, and the air pressure in the cap box continues to increase, which can push the cap box to move upward. At this time, a gap appears between the cap box and the gas distribution plate, so that the gas is discharged from the gap, and is guided by multiple horizontal and longitudinal air ducts to disperse from the surroundings of the gas distribution plate, so as to achieve the purpose of aerating and mixing the material in the inner cylinder. After the fan is powered off, the high pressure is stopped. When the air is supplied under pressure, there is an instantaneous pressure difference in the inner cylinder. At this time, the air pressure in the hat box drops rapidly. The cooperation between the inclined exhaust holes and the guide plate makes it difficult for the material to rush into the gas distribution plate. Further, through the contraction tension of the elastic hydraulic rod, the hat box moves downward rapidly and contacts the gas distribution plate, thereby preventing the material from entering the exhaust holes. Even if part of the material is placed on the horizontal and longitudinal air ducts, when the air pressure in the hat box increases, the hat box moves upward, expanding the gap between the horizontal and longitudinal air ducts and the hat box, effectively flushing the material out again, and no blockage of the gas distribution plate will occur, which reduces the workload and does not affect the calcination effect.

[0024] 2. In the present invention, a motor, a screw rod, a toothed disc, a gear, a rotating rod and a stirring head are arranged. The output end of the motor drives the toothed disc to rotate, and the toothed disc meshes with four gears, so that the four gears drive four screw rods to rotate synchronously. The screw rod drives the material to be transported upward during the rotation. At the same time, the toothed disc drives the two rotating rods at the bottom to rotate, so that the multiple stirring heads on the rotating rod can fully stir the material. Since the screw rod transports the material upward and mixes the material again through the stirring head, the material is always in a flowing state in the content, thereby further improving its calcination effect.

[0025] 3. In the present invention, by arranging a combustion tube, an inner tube, a wind cap, a gas distribution plate and a partition, when the spiral rod is rotating, the material is transported upward and the stirring head is used to break up the material. Then the gas enters the cap box through the gas distribution plate. The guide groove at the top of the cap box is conical in design, which effectively disperses the gas from all sides and enters the exhaust hole to blow toward the material, fully increasing the fluidity of the material in the inner tube and improving the calcination effect of the heat source ejected by the injector on the material. The outer wall of the inner tube and the inner wall of the combustion tube are designed as a vacuum. At the same time, partitions are provided at the top and bottom of the inner tube, which effectively play a role in noise reduction and heat preservation, thereby improving the performance of the calcination device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention from a rear view;

[0028] Figure 3 It is a structural schematic diagram of the combustion tube cross section of the present invention;

[0029] Figure 4 It is a three-dimensional structural schematic diagram of the inner cylinder of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the connection between the toothed disc and the mixing assembly of the present invention;

[0031] Figure 6 It is a structural schematic diagram of a cross section of a gas distribution plate of the present invention;

[0032] In the figure: 1. bottom plate; 2. combustion tube; 3. supporting leg; 4. supporting frame; 5. combustion mechanism; 501. burner; 502. guide pipe; 503. ejector; 6. inner tube; 7. partition; 8. drive assembly; 801. motor; 802. toothed disc; 9. gear; 10. screw rod; 11. air guide assembly; 111. bellows; 112. fan; 12. air guide rod; 13. gas distribution plate; 14. cavity; 15. air inlet; 16. horizontal air duct; 17. longitudinal air duct; 18. hood assembly; 181. hood box; 182. guide groove; 183. exhaust hole; 184. guide plate; 185. elastic hydraulic rod; 186. column; 19. mixing assembly; 191. rotating rod; 192. stirring head; 20. controller. DETAILED DESCRIPTION

[0033] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0034] like Figure 1-6 As shown, the present invention provides a technical solution: a gypsum powder calcining device with an anti-powder return hood, comprising a base plate 1, the upper surface of the base plate 1 is fixedly connected to the lower surface of the combustion tube 2 through six supporting legs 3, the upper surface of the combustion tube 2 is fixedly connected to the lower surface of the support frame 4, the front of the support frame 4 is provided with a controller 20, the top of the support frame 4 is provided with a combustion mechanism 5, the bottom ends of the combustion mechanisms 5 are all clamped on the combustion tube 2, an inner tube 6 is provided in the combustion tube 2, the upper surface of the inner wall of the support frame 4 is fixedly connected to the top of the driving assembly 8, the driving assembly 8 is meshed with four gears 9, the lower surface of the gear 9 is fixedly connected to the top of the screw rod 10, the outer wall of the screw rod 10 is arranged in the inner tube 6 through a bearing, and an air guide rod 12 is arranged between the four screw rods 10.

[0035] The bottom end of the air guide rod 12 passes through the inner tube 6 and the combustion tube 2 and is connected with the top of the air guide assembly 11. The upper and lower surfaces of the air guide assembly 11 are fixedly connected to the opposite surfaces of the combustion tube 2 and the base plate 1, respectively. The outer wall of the air guide rod 12 is provided with a plurality of gas distribution plates 13. The upper surface of the gas distribution plate 13 is provided with two hood assemblies 18. The left and right sides of the hood assembly 18 are respectively provided with transverse air ducts 16 and longitudinal air ducts 17. Both the transverse air ducts 16 and the longitudinal air ducts 17 are opened on the upper surface of the gas distribution plate 13. An air inlet 15 is provided below the hood assembly 18. The air inlet 15 is opened on the upper surface of the gas distribution plate 13. The air inlet 15 is connected with the cavity 14. The cavity 14 is arranged in the gas distribution plate 13. A feed valve and a discharge valve are respectively provided above and below the back of the combustion tube 2.

[0036] Specifically, Figure 1 and Figure 4As shown, the top and bottom of the inner tube 6 are fixedly connected with partitions 7, and the sides of the two partitions 7 away from each other are respectively fixedly connected to the top and bottom of the inner wall of the combustion tube 2, and the partitions 7 are set as high-temperature resistant insulation pads. Through the mutual cooperation between the inner tube 6 and the combustion tube 2, the outer wall of the inner tube 6 and the inner wall of the combustion tube 2 are designed as a vacuum. At the same time, the top and bottom of the inner tube 6 are provided with partitions 7, which effectively play a role in noise reduction and heat preservation, thereby improving the performance of the calcining device. The outer wall of the inner tube 6 and the inner wall of the combustion tube 2 are designed as a vacuum. The combustion mechanism 5 includes a burner 501, and the lower surface of the burner 501 is fixedly connected to the upper surface of the support frame 4. The output end of the burner 501 is connected to four conducting pipes 502, and the bottom end of the conducting pipe 502 is provided with an injector 503. The four injectors 503 are all clamped on the combustion tube 2 and extend to the inside of the inner tube 6.

[0037] Specifically, Figure 3 , Figure 5 and Figure 6As shown, the driving assembly 8 includes a motor 801, the upper surface of the motor 801 body is fixedly connected to the upper surface of the inner wall of the support frame 4, the output shaft of the motor 801 is fixedly connected to the upper surface of the toothed disc 802, the toothed disc 802 is meshed with the four gears 9, the air guide assembly 11 includes a bellows 111, the upper surface of the bellows 111 is fixedly connected to the lower surface of the combustion tube 2, the lower surface of the bellows 111 is fixedly connected to the upper surface of the bottom plate 1, the top of the bellows 111 is connected to the bottom end of the air guide rod 12, the back of the bellows 111 is connected to the output end of the fan 112, the lower surface of the fan 112 body is fixedly connected to the upper surface of the bottom plate 1, and the hood assembly 18 includes a cap box 181, the lower surface of the cap box 181 is connected to the air guide rod 12, the back of the bellows 111 is connected to the output end of the fan 112, the lower surface of the fan 112 body is fixedly connected to the upper surface of the bottom plate 1, and the hood assembly 18 includes a cap box 181. The upper surface of the body distribution plate 13 is overlapped, and a guide groove 182 is provided at the top of the inner wall of the hat box 181. The guide groove 182 is of a conical design. The guide groove 182 at the top of the hat box 181 is of a conical design, which effectively disperses the gas from all around and enters the exhaust hole 183 to blow toward the material, fully increasing the fluidity of the material in the inner cylinder 6, and improving the calcination effect of the heat source ejected by the injector 503 on the material. The inner wall of the hat box 181 is provided with four exhaust holes 183, and the exhaust holes 183 are of an inclined design. The middle part of the inner wall of the hat box 181 is clamped with a guide plate 184, and the upper part of the outer wall of the guide plate 184 is of an inclined design. The top of the inner wall of the guide groove 182 is fixedly connected to the top of the elastic hydraulic rod 185, and the elastic hydraulic The rod 185 cooperates with the cap box 181, and there is an instantaneous pressure difference in the inner cylinder 6. At this time, the air pressure in the cap box 181 drops rapidly. The inclined exhaust hole 183 and the guide plate 184 cooperate with each other, making it difficult for the material to rush into the gas distribution plate 13. Further, through the contraction tension of the elastic hydraulic rod 185, the cap box 181 moves downward rapidly and contacts with the gas distribution plate 13, thereby preventing the material from entering the exhaust hole 183. The bottom end of the elastic hydraulic rod 185 is fixedly connected to the lower surface of the inner wall of the cavity 14 through the column 186. The bottom end of the toothed disc 802 passes through the combustion cylinder 2 and the inner cylinder 6 and is fixedly connected to one end of the two mixing components 19. The mixing component 19 includes a rotating rod 1 91. Through the mutual cooperation between the screw rod 10 and the stirring head 192, the screw rod 10 drives the material to be transported upward during the rotation. At the same time, the toothed disc 802 drives the two rotating rods 191 at the bottom to rotate, so that the multiple stirring heads 192 on the rotating rod 191 can fully stir the material. Since the screw rod 10 transports the material upward and mixes the material again through the stirring head 192, the material is always in a flowing state in the content, thereby further improving its calcination effect. One end of the rotating rod 191 is fixedly connected to the bottom end of the toothed disc 802, and a plurality of stirring heads 192 are provided on the outer wall of the rotating rod 191. The bottom ends of the two rotating rods 191 are arranged on the outer wall of the air guide rod 12 through the same shaft sleeve.

[0038] An automatic control method for a gypsum powder calcining device with an anti-powder return hood comprises the following steps:

[0039] S1. When calcining gypsum powder, it is poured into the inner cylinder 6 through the feed valve, and the motor 801 is controlled by the controller 20 to work. The output end of the motor 801 drives the toothed disc 802 to rotate, and the toothed disc 802 is meshed with the four gears 9, so that the four gears 9 drive the four screw rods 10 to rotate synchronously, and the screw rods 10 drive the material to be transported upward during the rotation.

[0040] S2. At the same time, the toothed disc 802 drives the two rotating rods 191 at the bottom to rotate, so that the multiple stirring heads 192 on the rotating rods 191 can fully stir the materials. Since the spiral rod 10 transports the materials upward and mixes the materials again through the stirring heads 192, the materials are always in a flowing state in the content, and the materials are broken and mixed.

[0041] S3. During the material mixing process, after the motor 801 has worked for 10-15 minutes, the controller 20 starts the fan 112 and the burner 501 to work, so that the gas enters the air guide rod 12 through the bellows 111, and the air guide rod 12 distributes the gas to the cavity 14 of multiple gas distribution plates 13. When the gas in the cavity 14 increases, the gas is squeezed against the hat box 181 through the air inlet 15, and the guide groove 182 on the top of the hat box 181 is of a conical design, which effectively disperses the gas from all sides and enters the exhaust hole 183.

[0042] S4. When the air pressure in the hat box 181 continues to increase and can push the hat box 181 to move upward, a gap appears between the hat box 181 and the gas distribution plate 13, allowing the gas to be discharged from the gap and guided through multiple transverse air ducts 16 and longitudinal air ducts 17 to disperse from all sides of the gas distribution plate 13, thereby achieving the purpose of aerating and mixing the materials in the inner tube 6 and further increasing the fluidity of the materials. At the same time, after the burner 501 works, the heat source is sprayed through four injectors 503 to calcine the materials in the inner tube 6.

[0043] S5. When the calcination time reaches the preset time, the controller 20 automatically controls the burner 501 to stop working, and the motor 801 and the air pump continue to work to make the material heated evenly. When the motor 801 and the fan 112 meet the working time, the fan 112 and the motor 801 are powered off and the high-pressure air supply is stopped. There is an instantaneous pressure difference in the inner cylinder 6. At this time, the air pressure in the hat box 181 drops rapidly. The cooperation between the inclined exhaust holes 183 and the guide plate 184 makes it difficult for the material to rush into the gas distribution plate 13. Further, through the contraction tension of the elastic hydraulic rod 185, the hat box 181 moves downward rapidly and contacts with the gas distribution plate 13, thereby preventing the material from entering the exhaust holes 183. Even if part of the material is placed on the transverse air duct 16 and the longitudinal air duct 17, when the air pressure in the hat box 181 increases, the hat box 181 moves upward, expanding the gap between the transverse air duct 16 and the longitudinal air duct 17 and the hat box 181, and effectively flushing the material out again.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A gypsum powder calcining device with an anti-powder return hood, comprising a bottom plate (1), characterized in that: The upper surface of the bottom plate (1) is fixedly connected to the lower surface of the combustion cylinder (2) through six supporting legs (3); the upper surface of the combustion cylinder (2) is fixedly connected to the lower surface of the support frame (4); a controller (20) is arranged on the front of the support frame (4); a combustion mechanism (5) is arranged on the top of the support frame (4); the bottom ends of the combustion mechanisms (5) are all clamped on the combustion cylinder (2); an inner cylinder (6) is arranged in the combustion cylinder (2); the upper surface of the inner wall of the support frame (4) is fixedly connected to the top of a driving component (8); the driving component (8) and four gears (9) are meshed with each other; the lower surface of the gear (9) is fixedly connected to the top of a screw rod (10); the outer wall of the screw rod (10) is arranged in the inner cylinder (6) through a bearing; and an air guide rod (12) is arranged between the four screw rods (10); The bottom end of the air guide rod (12) passes through the inner tube (6) and the combustion tube (2) and is connected to the top of the air guide assembly (11); the upper surface and the lower surface of the air guide assembly (11) are respectively fixedly connected to the combustion tube (2) and the opposite surface of the bottom plate (1); the outer wall of the air guide rod (12) is provided with a plurality of gas distribution plates (13); the upper surface of the gas distribution plate (13) is provided with two hood assemblies (18); the left and right sides of the hood assembly (18) are respectively provided with transverse air ducts (16) and a longitudinal air duct (17), the transverse air duct (16) and the longitudinal air duct (17) are both provided on the upper surface of the gas distribution plate (13), an air inlet (15) is provided below the hood assembly (18), the air inlet (15) is provided on the upper surface of the gas distribution plate (13), the air inlet (15) is communicated with a cavity (14), the cavity (14) is provided in the gas distribution plate (13), and a feed valve and a discharge valve are provided above and below the back side of the combustion tube (2), respectively; The hood assembly (18) comprises a hat box (181), the lower surface of the hat box (181) overlaps the upper surface of the gas distribution plate (13), the top of the inner wall of the hat box (181) is provided with a guide groove (182), the guide groove (182) is of conical design, the inner wall of the hat box (181) is provided with four exhaust holes (183), the exhaust holes (183) are of inclined design, a guide plate (184) is clamped in the middle of the inner wall of the hat box (181), the upper part of the outer wall of the guide plate (184) is of inclined design, the top of the inner wall of the guide groove (182) is fixedly connected to the top end of an elastic hydraulic rod (185), and the bottom end of the elastic hydraulic rod (185) is fixedly connected to the lower surface of the inner wall of the cavity (14) through a column (186).

2. The gypsum powder calcining device with an anti-powder return hood according to claim 1, characterized in that: The top and bottom of the inner tube (6) are both fixedly connected with partitions (7), and the sides of the two partitions (7) that are away from each other are respectively fixedly connected to the top and bottom of the inner wall of the combustion tube (2), and the partitions (7) are configured as high-temperature resistant heat insulation pads. A vacuum design is used between the outer wall of the inner tube (6) and the inner wall of the combustion tube (2).

3. The gypsum powder calcining device with an anti-powder return hood according to claim 1, characterized in that: The combustion mechanism (5) comprises a burner (501), the lower surface of the burner (501) being fixedly connected to the upper surface of the support frame (4), the output end of the burner (501) being connected to four conducting tubes (502), the bottom end of the conducting tube (502) being provided with an injector (503), the four injectors (503) being all clamped on the combustion cylinder (2) and extending into the interior of the inner cylinder (6).

4. The gypsum powder calcining device with an anti-powder return hood according to claim 1, characterized in that: The driving assembly (8) comprises a motor (801), the upper surface of the motor (801) body being fixedly connected to the upper surface of the inner wall of the support frame (4), the output shaft of the motor (801) being fixedly connected to the upper surface of a toothed disc (802), and the toothed disc (802) and four gears (9) being meshed with each other.

5. The gypsum powder calcining device with an anti-powder return hood according to claim 1, characterized in that: The air guide assembly (11) comprises a wind box (111), the upper surface of the wind box (111) being fixedly connected to the lower surface of the combustion cylinder (2), the lower surface of the wind box (111) being fixedly connected to the upper surface of the bottom plate (1), the top of the wind box (111) being connected to the bottom end of the wind guide rod (12), the back of the wind box (111) being connected to the output end of the fan (112), and the lower surface of the body of the fan (112) being fixedly connected to the upper surface of the bottom plate (1).

6. The gypsum powder calcining device with an anti-powder return hood according to claim 4, characterized in that: The bottom end of the toothed disc (802) passes through the combustion cylinder (2) and the inner cylinder (6) and is fixedly connected to one end of two mixing assemblies (19); the mixing assemblies (19) include a rotating rod (191); one end of the rotating rod (191) is fixedly connected to the bottom end of the toothed disc (802); a plurality of stirring heads (192) are provided on the outer wall of the rotating rod (191); and the bottom ends of the two rotating rods (191) are arranged on the outer wall of the air guide rod (12) via a common shaft sleeve.

7. The automatic control method of a gypsum powder calcining device with an anti-powder return hood according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. When calcining gypsum powder, the gypsum powder is poured into the inner cylinder (6) through the feed valve, and the motor (801) is controlled by the controller (20) to work. The output end of the motor (801) drives the toothed disc (802) to rotate, and the toothed disc (802) and the four gears (9) are meshed with each other, so that the four gears (9) drive the four screw rods (10) to rotate synchronously, and the screw rods (10) drive the material to be transported upward during the rotation process; S2. At the same time, the toothed disc (802) drives the two rotating rods (191) at the bottom to rotate, so that the multiple stirring heads (192) on the rotating rods (191) stir the materials fully. Since the spiral rod (10) transports the materials upward and mixes the materials again through the stirring heads (192), the materials are always in a flowing state in the content, and the materials are broken and mixed. S3. During the material mixing process, after the motor (801) has worked for 10-15 minutes, the controller (20) starts the fan (112) and the burner (501) to operate, so that the gas passes through the bellows (111) and enters the air guide rod (12). The air guide rod (12) distributes the gas to the cavities (14) of the plurality of gas distribution plates (13). When the gas in the cavity (14) increases, the gas passes through the air inlet (15) and squeezes the hat box (181). The guide groove (182) at the top of the hat box (181) is of a conical design, which effectively disperses the gas from all sides and enters the exhaust hole (183). S4, when the air pressure in the hat box (181) continues to increase and can push the hat box (181) to move upward, a gap appears between the hat box (181) and the gas distribution plate (13), allowing the gas to be discharged from the gap and guided through a plurality of transverse air ducts (16) and longitudinal air ducts (17) so that the gas is dispersed from the periphery of the gas distribution plate (13), thereby achieving the purpose of aerating and mixing the material in the inner cylinder (6) and further increasing the fluidity of the material. At the same time, after the burner (501) is working, the heat source is sprayed through the four injectors (503) to calcine the material in the inner cylinder (6); S5. When the calcination time reaches the preset time, the controller (20) automatically controls the burner (501) to stop working, while the motor (801) and the air pump continue to work, so that the material is heated evenly. When the motor (801) and the fan (112) meet the working time, the fan (112) and the motor (801) are powered off, and the high-pressure air supply is stopped. Then, there is an instantaneous pressure difference in the inner tube (6). At this time, the air pressure in the hat box (181) decreases rapidly, and the inclined exhaust hole (183) and the guide plate (184) cooperate with each other to make the material It is difficult for the material to enter the gas distribution plate (13). Further, through the contraction pulling force of the elastic hydraulic rod (185), the hat box (181) is quickly moved downward and contacts the gas distribution plate (13), thereby preventing the material from entering the exhaust hole (183). Even if part of the material is placed on the transverse air duct (16) and the longitudinal air duct (17), when the air pressure in the hat box (181) increases, the hat box (181) moves upward, expanding the gap between the transverse air duct (16) and the longitudinal air duct (17) and the hat box (181), and effectively flushing the material out again.

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