Mixing and stirring equipment for improving uniformity of cement compounding

Abstract

The application discloses a mixing and stirring device for improving uniformity of cement compounding, which comprises a cement raw material tank, an external admixture raw material tank, an additive raw material tank and a stirring mechanism, an in-tank conveying mechanism is arranged on the outer wall of the stirring mechanism, the in-tank conveying mechanism is used for conveying powder in the tank, a stirring mechanism is arranged on the ground, the cement raw material tank, the external admixture raw material tank and the additive raw material tank are arranged on the outer periphery of the stirring mechanism, and the cement raw material tank, the external admixture raw material tank and the additive raw material tank are communicated with the stirring mechanism; integrated mixing is simultaneously performed, the mixing efficiency is improved, the uniformity of mixing is maintained, air power is used for conveying, the conveying mechanism is prevented from being overheated due to too fast conveying, the conveying speed is adjusted at any time, and continuous stirring and mixing are simultaneously performed, the stirring and mixing interval is reduced, and the mixing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cement preparation equipment, and more specifically to a mixing and stirring device for improving the uniformity of cement blending. Background Technology

[0002] Current cement blending processes require placing various materials in corresponding storage tanks according to specific ratios. These materials are then transported sequentially through pipelines to multiple mixing drums for mixing with different materials. This process necessitates multiple mixing steps to complete the cement blending process. However, during transportation, due to density differences among the materials within the blended cement, long-distance transport can cause the evenly mixed semi-finished cement to separate into layers, resulting in uneven mixing. Furthermore, the current blending method, which uses multiple storage tanks and mixing mechanisms for gradual mixing, has low efficiency and requires a large footprint, leading to low space utilization. Additionally, the current method primarily involves placing cement and its mixed materials into mixing drums for mixing, and then conveying the mixed powder away from the mixing mechanism after mixing. This process results in long loading and unloading times, further delaying the blending process.

[0003] Currently, cement is transported through long-distance auger channels during compounding, which results in low transport efficiency. Furthermore, high-speed transport causes the transport channels to overheat, further impacting cement transport and compounding efficiency. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention proposes a mixing and stirring device to improve the uniformity of cement blending, reduce the conveying distance, prevent stratification during conveying, and perform integrated mixing, thereby improving mixing efficiency and maintaining mixing uniformity. Pneumatic conveying is used to prevent the conveying mechanism from overheating due to excessive conveying speed, and the conveying speed can be adjusted at any time. Continuous stirring and mixing are also employed to reduce the intervals between mixing operations and further improve mixing efficiency.

[0005] To achieve the above objectives, the present invention provides a mixing and stirring device for improving the uniformity of cement blending, comprising a cement raw material tank, an admixture raw material tank, an additive raw material tank, and a mixing mechanism. An internal conveying mechanism is provided on the outer wall of the mixing mechanism to convey the powder materials within the tank. The mixing mechanism is located on the ground, and the cement raw material tank, admixture raw material tank, and additive raw material tank are arranged around the outer periphery of the mixing mechanism. The cement raw material tank, admixture raw material tank, and additive raw material tank are all connected to the mixing mechanism. An external conveying mechanism is provided between the cement raw material tank, admixture raw material tank, and additive raw material tank and the mixing mechanism to convey the cement raw material tank... Raw materials from external admixture tanks and additive tanks are transported to a mixing mechanism for stirring. A stratification elimination component is installed within the tank conveying mechanism to eliminate stratification during transport. The mixing mechanism includes a mixing drum, baffles, mixing components, and a buffer plate. Multiple baffles divide the mixing drum into multiple mixing zones. Multiple sets of mixing components are installed within the mixing mechanism, with one component in each mixing zone. An internal conveying mechanism is fitted onto the outer wall of the mixing drum. This internal conveying mechanism includes a conveying pipe, a pneumatic conveying component, and a lifting sealing plate. The conveying pipe is fitted onto the outer wall of the mixing drum, and the inner wall of the conveying pipe is flush with the outer wall of the mixing drum. There are channels for cement flow between the walls. Multiple sets of discharge and loading notches are provided on the outer wall of the mixing drum for cement and compound materials to pass through. Each set of loading and discharge notches is located on the outer wall of the mixing drum on the upper and lower sides of the baffle. Multiple baffles are installed between the mixing drum and the inside of the conveying pipe, with the inner side of each baffle sloping downwards. A fixing plate is installed on top of each baffle, with the fixing plate located above the discharge notch. The bottom of the baffle is flush with the bottom of the loading notch. Thus, the fixing plate, baffles, inner wall of the conveying channel, and outer wall of the mixing drum form a space for conveying cement. A pneumatic conveying assembly is installed on the fixing plate to convey the mixture from the upper mixing zone to the lower zone. A stratification elimination component is installed inside the feeding gap. A lifting sealing plate is fitted on the outer wall of the mixing drum, and the lifting sealing plate is linked with the pneumatic conveying component. The external conveying mechanism includes a conveying pipe, an air jet component, and an air suction component. The bottom of the external admixture raw material tank and the additive raw material tank are connected to the outer wall of the mixing drum through the conveying pipe. An air jet component is installed at the bottom of the external admixture raw material tank and the additive raw material tank, and the gas sprayed by the air jet component presses against the conveying pipe to flow. In this way, the powder from the external admixture raw material tank and the additive raw material tank is conveyed into the mixing zone by applying energy through the air jet component. A filter screen is installed at the bottom of each partition. A negative pressure component is installed on the outer wall of the mixing drum between the filter screen and the partition, and the air is drawn away by the negative pressure component.

[0006] Preferably, the stirring assembly includes a drive shaft, stirring modules, and conveying spiral blades. The drive shaft passes through the stirring drum and is coaxial with the stirring drum. The drive shaft is driven by a motor. A gear ring is provided on the inner wall of each stirring zone. Multiple partition-shaped stirring blades are fixed on the drive shaft. Multiple sets of stirring modules are arranged between adjacent stirring blades. The multiple sets of stirring modules are located around the drive shaft. The stirring modules are driven by the gear ring through a gear system, thus realizing that multiple stirring modules rotate in the same direction. A conveying spiral blade is provided on the drive shaft, and the outer wall of the spiral conveying blade is in contact with the inner wall of the stirring drum. The top of the spiral conveying blade is lower than the stirring module. A buffer plate is provided at the bottom of the spiral conveying blade. The outer wall of the buffer plate is in close contact with the inner wall of the stirring drum. An elastic component is provided between the buffer plate and the top of the partition plate, and the elastic component realizes the lifting and lowering of the buffer plate.

[0007] Preferably, the stirring module includes a rotating rod and stirring rods. Multiple stirring rods are arranged vertically in parallel on one side of the rotating rod and mounted on it. The rotating rod drives the multiple stirring rods to rotate together. The rotating rod is fixed to a drive shaft via bearings and is parallel to the drive shaft. The drive shaft drives the rotating rod to rotate around the drive shaft. A gear is fixed to the top of the rotating rod and meshes with a gear ring, thus achieving the rotation of the rotating rod. A partition component is provided on the inner wall of the stirring drum between the stirring module and the conveying spiral blade. A fixed bearing is provided on the drive shaft, and a partition component is fixed on the outer wall of the fixed bearing. The partition component is an air cushion, which is fixed to the fixed bearing on its inner side and contacts the inner wall of the stirring drum. After the air cushion is inflated, it contacts the inner wall of the stirring drum, thus separating the stirring areas. A cable is fixed to the outer periphery of the air cushion, passing through the stirring drum and connecting to a collar fitted on the conveying channel. A cylinder is provided between the collar and the outer wall of the conveying channel to control the raising and lowering of the collar.

[0008] Preferably, the lifting sealing plate moves up and down on the outer wall of the mixing drum, thereby closing and opening the unloading gap. The pneumatic conveying assembly includes an air pipe, an air pump, an air guide ring, and jet nozzles. An air guide ring is fixed at the bottom of the fixed plate and connected to the air pipe, which is connected to the air pump. The air pump supplies air to the air guide ring. Multiple vertically downward jet nozzles are fixed on the air guide ring. A rotating assembly is provided between the air pipe and the air guide ring. The rotating assembly includes a fixed ring and a spiral channel. A spiral channel is provided on the inner wall of the spiral channel. Fixed rings are fixed at both ends of the spiral channel by bearings, and the two fixed rings are respectively connected to the air pipe / air guide ring. A pull rope is fixed on the outer wall of the spiral channel. A pulley is provided on the outer wall of the mixing drum, and the pulley is located at the top of the lifting sealing plate. The pull rope passes around the pulley and is connected to the lifting sealing plate.

[0009] Preferably, the stratification elimination component includes a rotating shaft and rotating blades. Multiple rotating blades are provided on the rotating shaft. The rotating shaft is installed in the feeding gap through bearings. The rotating shaft is rotated by wind power, so that it can also be stirred and blocked during conveying, thereby reducing the phenomenon of powder stratification.

[0010] Compared with the prior art, the advantages of the present invention are: simultaneous integrated mixing, which improves mixing efficiency and maintains mixing uniformity; pneumatic conveying, which prevents the conveying mechanism from overheating due to excessive conveying speed, and allows for real-time adjustment of the conveying speed; and continuous stirring and mixing, which reduces the gaps in stirring and mixing, and improves mixing efficiency. Attached Figure Description

[0011] Figure 1 This is the front view of the present invention.

[0012] Figure 2 This is a cross-sectional view of the present invention.

[0013] Figure 3 This is a cross-sectional view of the stirring mechanism of the present invention.

[0014] Figure 4 This is a schematic diagram of the stirring assembly and gear ring of the present invention engaging.

[0015] Figure 5 This is a schematic diagram of the stirring assembly of the present invention with the gears removed.

[0016] Figure 6 This is a schematic diagram of the in-tank conveying mechanism of the present invention.

[0017] Figure 7 This is a schematic diagram of the rotating component of the present invention.

[0018] The components include: 1. Cement raw material tank; 2. Admixture raw material tank; 3. Additive raw material tank; 4. Mixing mechanism; 4.1. Mixing drum; 4.2. Baffle plate; 4.3. Mixing zone; 4.4. Mixing assembly; 4.5. Drive shaft; 4.6. Mixing module; 4.7. Rotating rod; 4.8. Mixing rod; 4.9. Gear; 4.10. Conveying spiral blade; 4.11. Gear ring; 4.12. Mixing blade; 4.13. Buffer plate; 4.14. Elastic component; 4.15. Separating component; 4.16. Fixed bearing; 4.17. Air cushion; 4.18. Cable; 4.19. Collar; 5. Internal conveying mechanism: 5.1 Conveying pipe; 5.2 Pneumatic conveying assembly; 5.3 Air pipe; 5.4 Air pump; 5.5 Air guide ring; 5.6 Air jet tube; 5.7 Rotating assembly; 5.8 Fixed ring; 5.9 Spiral channel; 5.10 Pull rope; 5.11 Lifting sealing plate; 5.12 Discharge notch; 5.13 Feeding notch; 5.14 Baffle; 5.15 Fixed plate; 6. External conveying mechanism: 6.1 Conveying pipe; 6.2 Air jet assembly; 6.3 Suction assembly; 6.4 Filter screen; 7. Delamination elimination assembly; 7.1 Rotating shaft; 7.2 Rotating blade. 7.2 Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] like Figure 1-7As shown, a mixing and stirring device for improving the uniformity of cement compounding includes a cement raw material tank 1, an admixture raw material tank 2, an additive raw material tank 3, and a mixing mechanism 4. An internal conveying mechanism 5 is installed on the outer wall of the mixing mechanism 4 to convey the powder materials inside the tank. The mixing mechanism 4 is installed on the ground (a frame is fixed to the bottom of the mixing mechanism 4 by bolts, and the bottom of the frame is fixed to the ground by bolts). Similarly, the cement raw material tank 1, the admixture raw material tank 2, and the additive raw material tank 3 are also installed on the ground around the mixing mechanism 4, and are also fixed to the frame by bolts. The additive raw material tank 3 is connected to the mixing mechanism 4. Cement and compounding materials are supplied to the mixing mechanism 4 through the cement raw material tank 1, the external admixture raw material tank 2, and the additive raw material tank 3. An external conveying mechanism 6 is set between the cement raw material tank 1, the external admixture raw material tank 2, and the additive raw material tank 3 and the mixing mechanism 4. The external conveying mechanism 6 realizes the transportation of cement and raw materials from the cement raw material tank 1, the external admixture raw material tank 2, and the additive raw material tank 3 into the mixing mechanism 4 for mixing. A stratification elimination component 7 is set in the internal conveying mechanism 5. The stratification elimination component 7 eliminates stratification during transportation, which can effectively prevent stratification of cement and mixed powder during transportation and reduce uniformity. The mixing mechanism 4 includes a mixing drum 4. 1. Partition plate 4.2, mixing assembly 4.4, and buffer plate 4.13. Multiple partition plates 4.2 are fixed inside the mixing drum 4.1 by bolts, dividing the drum 4.1 into multiple vertically arranged mixing zones 4.3. Multiple sets of mixing assemblies 4.4 are installed within the mixing mechanism 4, and each mixing zone 4.3 contains a mixing assembly 4.4. Cement and compound materials enter the mixing zone 4.3 for mixing (cement enters each mixing zone 4.3 sequentially from top to bottom; materials from the admixture raw material tank and additive raw material tank 3 enter different mixing zones 4.3 to mix with cement, thus forming a sequential mixing with the compound materials). An internal conveying mechanism 5 is fitted onto the outer wall of the mixing drum 4.1. The internal conveying mechanism 5 includes a conveying pipe 6.1, a pneumatic conveying assembly 5.2, and a lifting sealing plate 5.11. The conveying pipe 6.1 is fitted onto the outer wall of the mixing drum 4.1, and there is a channel for cement flow between the inner wall of the conveying pipe 6.1 and the outer wall of the mixing drum 4.1. Multiple sets of discharge notches 5.12 and feeding notches 5.13 for cement and compound materials are provided on the outer wall of the mixing drum 4.1. Each set of feeding notches 5.13 and discharge notches 5.12 is located on the outer wall of the mixing drum 4.1 on the upper and lower sides of the partition plate 4.2. Multiple baffles 5.14 are fixed to the mixing drum 4.1 and the inside of the conveying pipe 6.1 by bolts.The inner side of baffle 5.14 is a downward sloping surface. A fixing plate 5.15 is bolted to the top of each baffle 5.14. The fixing plate 5.15 is located above the discharge notch 5.12 (the fixing plate 5.15 is annular, sealing the space between the mixing drum 4.1 and the conveying channel). The bottom of the baffle 5.14 is flush with the bottom of the feeding notch 5.13. The powder that has been uniformly mixed in the mixing zone 4.3 falls onto the baffle 5.14 through the discharge notch 5.12, then slides down the baffle 5.14 into the feeding notch 5.13 to enter the next mixing zone 4.3 for further mixing. In this way, the fixing plate 5.15, baffle 5.14, the inner wall of the conveying channel, and the outer wall of the mixing drum 4.1 form a space for conveying cement. A pneumatic conveying assembly 5.2 is fixed to the mixing zone 4.3 by bolts. The pneumatic conveying assembly 5.2 transports the mixture from the upper mixing zone 4.3 to the lower zone, i.e., it conveys the powder downwards. This pneumatic conveying is achieved through pneumatic force. A stratification elimination assembly 7 is installed in each feeding gap 5.13. A lifting sealing plate 5.11 is fitted onto the outer wall of the mixing drum 4.1, and the lifting sealing plate 5.11 is linked to the pneumatic conveying assembly 5.2. The top surface of the partition plate 4.2 is higher in the middle and lower around the edges. The mixed powder after mixing in the mixing zone 4.3 falls onto the partition plate 4.2. The mixed powder on the partition plate 4.2 passes through the discharge gap 5.12 and enters the space between the outer wall of the mixing drum 4.1 and the conveying channel. The pneumatic conveying assembly 5.2 then conveys the powder. The mixed powder between the channel and the mixing drum 4.1 is blown into the feeding gap 5.13 of the lower mixing zone 4.3, thus completing the conveying. Simultaneously, the conveying distance of the mixed powder is relatively short, minimizing stratification. This allows the mixed powder to be conveyed to the next mixing zone 4.3 for further mixing with other materials. This multi-layered mixing achieves sequential hydraulic mixing of multiple materials, combining multiple mixing processes into a single device. This reduces the footprint and shortens the conveying length, improving compounding efficiency and reducing stratification. The external conveying mechanism 6 includes a conveying pipe 6.1, a jet assembly 6.2, and a suction assembly 6.3. The bottoms of the external admixture raw material tank 2 and the additive raw material tank 3 are connected to the mixing drum. The outer walls of the mixing drum 4.1 are connected by a conveying pipe 6.1. An air jet assembly 6.2 is bolted to the bottom of the admixture raw material tank 2 and the additive raw material tank 3, and the gas ejected from the air jet assembly 6.2 presses against the conveying pipe 6.1 for flow (the air jet assembly 6.2 is the air nozzle, which extends into one end of the conveying pipe 6.1, and the other end of the conveying pipe 6.1 is connected to the inside of the mixing drum 4.1). In this way, the air jet assembly 6.2 applies pressure to convey the powder from the admixture raw material tank 2 and the additive raw material tank 3 into the mixing zone 4.3 for mixing with the cement. A filter screen 6.4 is bolted to the bottom of each partition 4.2, and the edge of the filter screen 6.4 is set on the inner wall of the mixing drum 4.1. The filter screen 6.4 and the partition 4.A negative pressure assembly (considering a negative pressure pump and a negative pressure pipe) is fixed to the outer wall of the mixing drum 4.1 between points 2 and 3 via threaded joints. The negative pressure pipe is connected to the mixing drum 4.1 via the threaded joint, and the negative pressure pump is connected to the negative pressure pipe. The negative pressure pump creates negative pressure within the mixing zone 4.3, facilitating the pneumatic transport of cement and materials into the mixing zone 4.3. The negative pressure assembly removes excess air (cement and materials are transported to the mixing zone 4.3 pneumatically, and the negative pressure assembly removes any remaining air).

[0021] The stirring assembly 4.4 includes a drive shaft 4.5, stirring modules 4.6, and conveying spiral blades 4.10. The drive shaft 4.5 passes through the stirring drum 4.1 and is coaxial with the stirring drum 4.1. The top of the drive shaft 4.5 is driven by a motor (the motor output shaft is welded to the drive shaft 4.5). A gear ring 4.11 is welded to the inner wall of each stirring zone 4.3. Multiple partition-shaped stirring blades 4.12 are welded to the drive shaft 4.5. Multiple sets of stirring modules 4.6 are arranged between adjacent stirring blades 4.12. The multiple sets of stirring modules 4.6 are located around the drive shaft 4.5. The stirring modules 4.6 are driven by gears 4.9 and gear rings 4.11, thus achieving simultaneous rotation of multiple stirring modules 4.6. That is, when the stirring blades 4.12 are rotated by the drive shaft 4.5, the stirring modules 4.6 between the stirring blades 4.12 also rotate, thereby achieving multi-stage stirring. To ensure rapid and uniform mixing, a spiral conveyor blade 4.10 (spiral shape) is welded to the drive shaft 4.5, with its outer wall fitting against the inner wall of the mixing drum 4.1. The top of the spiral conveyor blade is lower than the mixing module 4.6. The spiral conveyor blade conveys the mixed powder downwards. A buffer plate 4.13 is placed at the bottom of the spiral conveyor blade, with its outer wall fitting tightly against the inner wall of the mixing drum 4.1. An elastic component 4.14 (a spring located between the partition plate 4.2 and the buffer plate 4.13) is installed between the buffer plate and the top of the partition plate 4.14. The elastic component 4.14 allows the buffer plate to rise and fall. The mixed cement is conveyed downwards by the spiral conveyor blade, causing the top of the buffer plate 4.13 to descend until it is flush with the bottom of the discharge gap 5.12. This allows the mixed powder to enter the conveying channel and be transported to the next mixing zone 4.3.

[0022] The stirring module 4.6 includes a rotating rod 4.7 and stirring rods 4.8. Multiple stirring rods 4.8 are fixed side-by-side vertically on both sides of the rotating rod 4.7 and are welded to it. The rotating rod 4.7 drives the multiple stirring rods 4.8 to rotate together. The rotating rod 4.7 is fixed to the drive shaft 4.5 by bearings, and the rotating rod 4.7 is parallel to the drive shaft 4.5. The drive shaft 4.5 drives the rotating rod 4.7 to rotate around it. A gear 4.9 is welded to the top of the rotating rod 4.7, and the gear 4.9 meshes with a gear ring 4.11. Thus, when the drive shaft 4.5 rotates, it achieves… The rotation of the rotating rod 4.7 enables the rotation of multiple stirring modules 4.6. A partition component 4.15 is provided on the inner wall of the stirring drum 4.1 between the stirring module 4.6 and the conveying spiral blade 4.10. A fixed bearing 4.16 is fixed to the drive shaft 4.5 by welding. The partition component 4.15 is fixed to the outer wall of the fixed bearing 4.16 by adhesive. The partition component 4.15 is an air cushion 4.17. The air cushion 4.17 expands into a disc shape by inflation. It is fixed to the fixed bearing 4.16 on the inner side and the outer wall of the air cushion 4.17 is in contact with the inner wall of the stirring drum 4.1. When the air cushion 4.17 is inflated, it moves the stirring drum 4.1. Internally separated, the air cushion 4.17, after being inflated, contacts the inner wall of the mixing drum 4.1, thus separating the mixing zone 4.3. A cable 4.18 is fixed to the outer periphery of the air cushion 4.17 by a rope. The cable 4.18 passes through the mixing drum 4.1 and connects to the outer wall of the conveying channel, where a collar 4.19 is fitted onto the conveying channel. The sliding of the cable 4.18 is achieved by raising and lowering the collar 4.19. A cylinder is installed between the collar 4.19 and the outer wall of the conveying channel to control the raising and lowering of the collar 4.19. The cylinder body is fixed to the outer wall of the conveying channel by bolts, and the piston rod of the cylinder is fixed to the collar 4.19 by welding. When it is necessary to separate the mixing zone 4, the air cushion 4.17 is used. At step 3, the air cushion 4.17 inflates, the collar 4.19 descends, and the rope 5.10 tightens the edge of the air cushion 4.17. This prevents the edge of the air cushion 4.17 from collapsing, which would prevent cement from entering the bolt conveyor and hindering mixing when cement is first added. The inflation of the air cushion 4.17 separates the screw conveyor blade from the mixing assembly 4.4, allowing cement powder to fall onto the air cushion 4.17 for even mixing. When there is a significant amount of powder on the air cushion 4.17, it deflates, the collar 4.19 rises, and the powder on the air cushion 4.17 loses support and falls onto the screw conveyor blade. When the screw conveyor blade is full, the air cushion 4.17 no longer needs to operate.

[0023] The lifting sealing plate moves up and down on the outer wall of the mixing drum 4.1, and the opening and closing of the unloading gap 5.12 is achieved by the lifting and lowering of the sealing plate. The pneumatic conveying assembly 5.2 includes an air pipe 5.3, an air pump 5.4, an air guide ring 5.5, and jet nozzles 5.6. The air guide ring 5.5 is fixed to the bottom of the fixed plate 5.15 by a clamp. The air guide ring 5.5 is connected to the air pipe 5.3, which is connected to the air pump 5.4. The air pump 5.4 supplies air to the air guide ring 5.5. Multiple vertically downward jet nozzles 5.6 are fixed on the air guide ring 5.5. A rotating assembly 5.7 is fixed between the air pipe 5.3 and the air guide ring 5.5 by a threaded joint. The rotating assembly 5.7 includes a fixed ring 5.8 and a spiral channel 5.9. The inner wall of the spiral channel 5.9 is provided with a spiral channel 5.9. When air enters the spiral channel 5.9... When the spiral channel 5.9 rotates, fixed rings 5.8 are fixed at both ends of the spiral channel 5.9 by bearings, and the two fixed rings 5.8 are respectively connected to the air pipe 5.3 / air guide ring 5.5. A pull rope 5.10 is fixed to the outer wall of the spiral channel 5.9 by welding. A pulley is fixed to the outer wall of the mixing drum 4.1 by bolts, and the pulley is located at the top of the lifting sealing plate. The pull rope 5.10 passes around the pulley and connects to the lifting sealing plate. When pneumatic conveying is performed, the high-pressure gas in the air pipe 5.3 enters the air guide ring 5.5, so the spiral channel 5.9 rotates. The pull rope 5.10 pulls the lifting sealing plate up, so the unloading notch 5.12 opens to unload the powder. When conveying is not required, the lifting sealing plate slides down under its own gravity to open the unloading notch 5.12.

[0024] The stratification elimination component 7 includes a rotating shaft 7.1 and rotating blades 7.2. Multiple rotating blades 7.2 are fixed to the rotating shaft 7.1 by welding. The rotating shaft 7.1 is installed in the feeding notch 5.13 by bearings, so that the rotating shaft 7.1 can rotate. The rotation of the rotating shaft 7.1 is achieved by wind power, which can also stir and block during conveying, thereby reducing the phenomenon of powder stratification.

Claims

1. A mixing and stirring device for improving the uniformity of cement blending, comprising a cement raw material tank, an admixture raw material tank, an additive raw material tank, and a mixing mechanism, wherein an internal conveying mechanism is provided on the outer wall of the mixing mechanism to convey the powder materials inside the tank, wherein the mixing mechanism is located on the ground, and the cement raw material tank, the admixture raw material tank, and the additive raw material tank are arranged around the outer periphery of the mixing mechanism, the cement raw material tank, the admixture raw material tank, and the additive raw material tank are respectively connected to the mixing mechanism, and an external conveying mechanism is provided between the cement raw material tank, the admixture raw material tank, the additive raw material tank, and the mixing mechanism to convey the raw materials in the cement raw material tank, the admixture raw material tank, and the additive raw material tank to the mixing mechanism for mixing; characterized in that, A stratification elimination component is installed within the tank conveying mechanism to eliminate stratification during conveying. The mixing mechanism includes a mixing drum, baffles, mixing components, and a buffer plate. Multiple baffles separate the mixing drum into multiple mixing zones. Multiple sets of mixing components are installed within the mixing mechanism, with one component in each mixing zone. An internal conveying mechanism is fitted onto the outer wall of the mixing drum. This mechanism includes a conveying pipe, a pneumatic conveying component, and a lifting sealing plate. The conveying pipe is fitted onto the outer wall of the mixing drum, and a channel for cement flow exists between the inner wall of the conveying pipe and the outer wall of the mixing drum. Multiple sets of discharge and loading notches are provided on the outer wall of the mixing drum for cement and compound materials to pass through. Each set of loading and discharge notches is located on the outer wall of the mixing drum on the upper and lower sides of the baffles. Multiple baffles are installed between the mixing drum and the inside of the conveying pipe, with each baffle having a downward-sloping inner side. A fixing plate is installed on the top of each baffle. Located above the unloading gap, the bottom of the baffle is flush with the bottom of the loading gap. This creates a space for conveying cement, formed by the fixed plate, baffle, inner wall of the conveying channel, and outer wall of the mixing drum. A pneumatic conveying assembly is installed on the fixed plate to convey the mixture from the upper mixing zone to the lower zone. A stratification elimination assembly is installed in each loading gap. A lifting sealing plate is fitted on the outer wall of the mixing drum and is linked to the pneumatic conveying assembly. The external conveying mechanism includes a conveying pipe, a jetting assembly, and a suction assembly. The bottom of the admixture raw material tank and the additive raw material tank are connected to the outer wall of the mixing drum through the conveying pipe. A jetting assembly is installed at the bottom of the admixture raw material tank and the additive raw material tank, and the gas ejected by the jetting assembly presses against the conveying pipe. This jetting assembly applies energy to convey the powder from the admixture raw material tank and the additive raw material tank into the mixing zone. A filter screen is installed at the bottom of each baffle. A negative pressure assembly is installed on the outer wall of the mixing drum between the filter screen and the baffle to remove air.

2. The mixing and stirring equipment for improving the uniformity of cement blending according to claim 1, characterized in that, The mixing assembly includes a drive shaft, mixing modules, and conveying spiral blades. The drive shaft passes through the mixing drum and is coaxial with the drum. The drive shaft is driven by a motor. A gear ring is installed on the inner wall of each mixing zone. Multiple partition-shaped mixing blades are fixed on the drive shaft. Multiple sets of mixing modules are arranged between adjacent mixing blades, and these modules are located around the drive shaft. The mixing modules are driven by a gear system and the gear ring, thus enabling multiple mixing modules to rotate in the same direction. A conveying spiral blade is installed on the drive shaft, and the outer wall of the spiral blade is in contact with the inner wall of the mixing drum. The top of the spiral blade is lower than the mixing module. A buffer plate is installed at the bottom of the spiral blade, and its outer wall is in close contact with the inner wall of the mixing drum. An elastic component is installed between the buffer plate and the top of the partition plate, allowing the buffer plate to be raised and lowered.

3. The mixing and stirring equipment for improving the uniformity of cement blending according to claim 2, characterized in that, The mixing module includes a rotating rod and a stirring rod. Multiple stirring rods are arranged vertically side-by-side on one side of the rotating rod and mounted on it. The rotating rod drives these stirring rods to rotate together. The rotating rod is fixed to a drive shaft via bearings and is parallel to the drive shaft. The drive shaft drives the rotating rod to rotate around it. A gear is fixed to the top of the rotating rod and meshes with a gear ring, thus enabling the rotating rod to rotate. A partition component is installed on the inner wall of the mixing drum between the mixing module and the conveying spiral blade. A fixed bearing is installed on the drive shaft, and the partition component, which is an air cushion, is fixed to the outer wall of the fixed bearing. The air cushion is fixed to the inner side of the fixed bearing, and the fixed bearing contacts the inner wall of the mixing drum. When inflated, the air cushion contacts the inner wall of the mixing drum, thus separating the mixing zones. A cable is fixed to the outer periphery of the air cushion, passing through the mixing drum and connecting to a collar fitted onto the conveying channel. A cylinder is installed between the collar and the outer wall of the conveying channel to control the raising and lowering of the collar.

4. A mixing and stirring device for improving the uniformity of cement blending according to claim 3, characterized in that, The lifting and lowering plate moves up and down on the outer wall of the mixing drum, thereby closing and opening the discharge opening. The pneumatic conveying assembly includes an air pipe, an air pump, an air guide ring, and air jets. An air guide ring is fixed at the bottom of the fixed plate and connected to the air pipe, which is connected to the air pump. The air pump supplies air to the air guide ring. Multiple vertically downward air jets are fixed on the air guide ring. A rotating assembly is set between the air pipe and the air guide ring. The rotating assembly includes a fixed ring and a spiral channel. The inner wall of the spiral channel is provided with a spiral channel. Fixed rings are fixed at both ends of the spiral channel by bearings, and the two fixed rings are respectively connected to the air pipe / air guide ring. A pull rope is fixed on the outer wall of the spiral channel. A pulley is set on the outer wall of the mixing drum, and the pulley is located on top of the lifting and lowering plate. The pull rope passes around the pulley and is connected to the lifting and lowering plate.

5. A mixing and stirring device for improving the uniformity of cement blending according to claim 4, characterized in that, The stratification elimination component includes a rotating shaft and rotating blades. Multiple rotating blades are installed on the rotating shaft, which is installed in the feeding gap via bearings. The rotating shaft is rotated by wind power, which can also agitate and block the material during conveying, thereby reducing the phenomenon of powder stratification.

Images