Concrete mixing device, production system and production method

Abstract

The invention discloses a concrete mixing device, a production system and a production method, and belongs to the technical field of concrete production. The concrete mixing device comprises a mixer, a connecting box is arranged at the top of the mixer, a mixing box is arranged at the bottom of the connecting box, the mixing box is communicated with the connecting box, and a mixing structure for mixing aggregate, powder and liquid is arranged in the mixing box; a powder premixing bin and an aggregate premixing bin are arranged at the top of the connecting box, a first stirring structure for pre-stirring powder is arranged in the powder premixing bin, and a second stirring structure for pre-stirring aggregate is arranged in the aggregate premixing bin; a liquid inlet pipe for adding liquid into the stirring box is arranged in the connecting box, and a discharging pipe is arranged at the bottom of the stirring box. By adopting the concrete mixing device, the production system and the production method provided by the invention, the problems of low concrete mixing efficiency and non-uniformity in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of concrete production technology, and in particular to a concrete mixing device, production system and production method. Background Technology

[0002] The main raw materials for concrete include cement, aggregates (coarse and fine aggregates, usually gravel and sand), water, and sometimes admixtures (such as water-reducing agents, early-strength agents, etc.) and additives (such as fly ash, slag powder, etc.). These raw materials are mixed evenly in a mixer according to the designed composition to obtain concrete. Concrete mixing is a crucial process; it's essential to ensure thorough mixing of all raw materials while avoiding segregation. Existing concrete mixers add powder, aggregates, and water together and mix them. Because powder and aggregates have different densities and particle sizes, segregation of the powder can easily occur during mixing, affecting the overall mixing effect of the concrete.

[0003] Existing patent CN202410572260.X discloses an energy-saving and environmentally friendly concrete production device and method, including: a mixing bin; an intermittent material control screen plate at the inlet of the mixing bin; the intermittent material control screen plate being connected to a material control drive mechanism located outside the mixing bin; two mixing roller mechanisms arranged opposite each other inside the mixing bin, the two mixing roller mechanisms being connected to the mixing drive mechanism located outside the mixing bin; and the mixing drive mechanism being connected to the material control drive mechanism. This invention, by providing an intermittent material control screen plate at the inlet of the mixing bin and connecting it to the material control drive mechanism located outside the mixing bin, allows for the intermittent addition of raw materials during concrete processing. The raw materials to be mixed are added while stirring, resulting in a reasonable proportion, good mixing uniformity, and less required mixing time. Furthermore, the intermittent material control screen plate can screen out larger-sized materials, ensuring the quality of the finished concrete product. Although the aforementioned patent can improve the uniformity of raw material mixing by adding and stirring simultaneously, the large size and quality differences between aggregates and powders make it difficult to fully and evenly mix the powders, affecting the dispersion of the powders in concrete and thus impacting the uniformity and efficiency of concrete mixing. Summary of the Invention

[0004] The purpose of this invention is to provide a concrete mixing device, production system, and production method to solve the problems of low mixing efficiency and unevenness in existing concrete mixing systems.

[0005] To achieve the above objectives, the present invention provides a concrete mixing device, including a mixer, a connecting box at the top of the mixer, a mixing box at the bottom of the connecting box, the mixing box being connected to the connecting box, and a mixing structure for mixing aggregates, powders, and liquids inside the mixing box; a powder premixing bin and an aggregate premixing bin at the top of the connecting box, a first mixing structure for premixing the powder inside the powder premixing bin, and a second mixing structure for premixing the aggregates inside the aggregate premixing bin; an inlet pipe for adding liquid to the mixing box inside the connecting box, and a discharge pipe at the bottom of the mixing box.

[0006] Preferably, the mixing tank includes two symmetrical and connected sub-tanks, and a mixing structure is disposed within the sub-tanks. The mixing structure includes a first mixing shaft and a second mixing shaft arranged along the axial direction of the mixing tank. The first mixing shaft and the second mixing shaft are respectively located within the two sub-tanks and are rotatably connected to the sub-tanks. Both the first mixing shaft and the second mixing shaft are provided with mixing components. The mixing components on the first mixing shaft and the second mixing shaft are spaced apart and overlapped. A first driven gear is provided at one end of the first mixing shaft outside the mixing tank, and a second driven gear is provided at one end of the second mixing shaft outside the mixing tank. A driving gear is rotatably disposed on the mixing tank and meshes with both the first driven gear and the second driven gear. A protective shell is provided on the mixing tank to protect the first driven gear, the second driven gear, and the driving gear. A first motor that drives the driving gear to rotate is disposed on the protective shell.

[0007] Preferably, the mixing components are spirally distributed on both the first and second stirring shafts. The mixing components include a fixed sleeve, which is detachably connected to the first and second stirring shafts. A connecting block is fixedly provided on the fixed sleeve, and a stirring block is detachably provided on the outside of the connecting block. The stirring block is inclined.

[0008] Preferably, the powder premixing chamber includes a first chamber, a first cover at the top of the first chamber, a first inlet on the first cover, a first stirring structure on the first cover, and a connecting box at the bottom of the first chamber via a first discharge port. The first stirring structure includes a first rotating plate, which is coaxially arranged with the first chamber and rotatably connected to the first cover. A second motor that drives the first rotating plate to rotate is provided on the first cover. A first central shaft is provided at the center of the first rotating plate, and a first stirring rod for stirring the powder is provided on the first central shaft. Several auxiliary stirring components are rotatably arranged on the first rotating plate, and the auxiliary stirring components are arranged in a circular array around the first central shaft. The first rotating plate drives the auxiliary stirring components to rotate, thereby stirring and mixing the powder.

[0009] Preferably, the auxiliary stirring assembly includes a rotating plate, one end of which is provided with a secondary shaft, which is rotatably connected to the first rotating plate. The top end of the secondary shaft is provided with a first gear, which meshes with a first fixed gear ring fixedly provided on the lower surface of the first cover. The other end of the rotating plate is rotatably provided with a first rotating shaft, the top end of which is provided with a second gear, which meshes with a second fixed gear ring fixedly provided on the first rotating plate. The first rotating shaft is provided with a plurality of spiral stirring blades for stirring the powder.

[0010] Preferably, the bottom of the first chamber is provided with a sealing structure for controlling the discharge of powder. The sealing structure includes a first sliding plate and a second sliding plate arranged opposite to each other. The first sliding plate and the second sliding plate are located on both sides of the discharge rod and are rotatably connected to the discharge rod in a sealed manner. The discharge rod is located at the bottom of the first central shaft and is fixedly connected to the first central shaft coaxially. The discharge rod is located inside the first discharge port and is provided with spiral discharge blades to facilitate the discharge of powder. The first sliding plate and the second sliding plate are set on a baffle. The baffle is located at the bottom of the first chamber and is fixedly connected to the inner wall of the first chamber. The center of the baffle is provided with a discharge port for discharging powder. The first sliding plate and the second sliding plate block the discharge port. The baffle is provided with a guide rail that guides the sliding of the first sliding plate and the second sliding plate. A transmission rod is provided between both ends of the first sliding plate and the second sliding plate. The middle part of the transmission rod is rotatably connected to the baffle. The two ends of the transmission plate are respectively hinged to the first sliding plate and the second sliding plate through a first connecting rod and a second connecting rod. The bottom end of the baffle is provided with a cylinder that drives the second sliding plate to slide.

[0011] Preferably, the aggregate premixing bin includes a second chamber, a second cover at the top of the second chamber, a second inlet on the second cover for allowing aggregate to enter the second chamber, a second stirring structure on the second cover, a second discharge port at the bottom of the second chamber communicating with a connecting box, and a valve at the second discharge port for controlling its opening and closing; the second stirring structure includes a second rotating plate located within the second chamber and coaxially arranged with it, a third motor on the second cover for driving the second rotating plate to rotate, the output shaft of the third motor being fixedly connected to the center of the second rotating plate via a connecting shaft, a second central shaft fixedly arranged at the center of the lower surface of the second rotating plate, a plurality of second stirring rods arranged on the second central shaft, a plurality of second rotating shafts rotatably arranged on the second rotating plate, a plurality of third stirring rods arranged on the second rotating shafts, the third stirring rods being staggered from the second stirring rods, a third gear at the top of the second rotating shaft, and the third gear meshing with a third fixed gear ring fixedly arranged on the second cover.

[0012] A concrete production system includes the aforementioned concrete mixing device. An aggregate bin is provided on one side of the mixer, and the aggregate in the aggregate bin is connected to an aggregate premix bin via a second conveyor belt. A powder bin is provided on the other side of the mixer, and a second collection hopper is provided at the bottom of the powder bin. The second collection hopper is connected to the powder premix bin via a conveyor. A liquid inlet pipe in the connecting box is connected to a liquid tank via a connecting pipe.

[0013] Preferably, the aggregate bin includes a storage bin, which contains several sub-bins. Each sub-bin has a sloping support grid at its top, with the aggregate positioned above the grid. The storage bin has a discharge bin corresponding to each sub-bin at its bottom, with a valve at the bottom of each discharge bin controlling its opening and closing. A weighing hopper, also corresponding to each discharge bin, has a valve at its bottom controlling its opening and closing. A first conveyor belt is positioned below the weighing hopper, transporting the aggregate to a first collection hopper at its end. A second conveyor belt is positioned below the first collection hopper. A vibrating motor is positioned below the support grid, and partitions are installed between the sub-bins. A dust collection hood is positioned above the storage bin, with its top connected to a dust collector via a conveying pipe.

[0014] The production method based on the above concrete production system includes the following steps: S1. The aggregate in the aggregate bin falls into the weighing hopper for weighing. The weighed aggregate falls into the first conveyor belt and then into the first collection hopper for temporary storage. The aggregate in the first collection hopper is then sent into the aggregate premixing bin via the second conveyor belt. The dust in the aggregate bin enters the dust collector through the dust collection hood and conveying pipe for dust removal. The air after dust removal is discharged through the fan and exhaust pipe. S2. The powder in the powder silo falls into the second collection silo for temporary storage, and the powder in the second collection silo enters the powder premixing silo through the conveyor. S3. The second motor starts, driving the first rotating plate to rotate. The first rotating plate drives the first central shaft to rotate, and the first central shaft drives the first stirring rod to rotate, stirring the powder in the center of the first chamber. The first rotating plate drives the secondary shaft to rotate synchronously. Under the action of the first fixed gear ring, the first gear drives the secondary shaft to rotate, and the secondary shaft drives the rotating plate to rotate synchronously. The rotating plate drives the first rotating shaft to rotate. Under the action of the second fixed gear ring, the second gear drives the first rotating shaft to rotate. The second rotating shaft drives the stirring blades to rotate around the first central shaft and rotate around the secondary shaft while rotating on their own axis, mixing the powder in the first chamber. S4. After the powder is mixed, the first cylinder retracts, driving the second slide plate to slide along the guide rail. The second slide plate, through the second connecting rod, transmission rod, and first connecting rod, drives the first slide plate to slide in the opposite direction along the guide rail, opening the discharge port and discharging the mixed powder through the discharge port. The first central shaft drives the discharge rod to rotate, which in turn drives the discharge blades to rotate, assisting in the discharge of the powder. The powder is discharged into the mixing tank through the first discharge port. S5. While the powder is being premixed, the third motor starts. The third motor drives the second rotating plate to rotate through the connecting shaft. The second rotating plate drives the second central shaft to rotate. The second central shaft drives the second stirring rod to rotate. The second rotating plate drives the second rotating shaft to rotate. Under the action of the third fixed gear ring, the third gear drives the second rotating shaft to rotate. The second rotating shaft drives the third stirring rod to rotate, premixing the aggregate. The premixed aggregate is discharged into the mixing tank through the second discharge port. S6. The liquid in the liquid tank enters the mixing tank through the connecting pipe and the liquid inlet pipe, and is mixed with the aggregate and powder. The first motor is started. The first motor drives the first mixing shaft and the second mixing shaft to rotate through the drive gear, the first driven gear and the second driven gear. The first mixing shaft and the second mixing shaft mix the raw materials through the mixing block. The mixed material is discharged through the discharge pipe at the bottom of the mixing tank.

[0015] The advantages and positive effects of the concrete mixing device, production system and production method described in this invention are as follows: 1. The top of the connecting box is equipped with a powder premixing bin and an aggregate premixing bin. The powder and aggregate are premixed before being discharged into the mixing box, which helps to improve the mixing efficiency and effect of aggregate and powder, and reduce component segregation.

[0016] 2. The powder premixing chamber is equipped with a first stirring structure. The powder in the first chamber is mixed by the first stirring rod on the first central shaft, and the powder at the edge of the first chamber is stirred and mixed by the stirring blade on the first rotating shaft, thereby improving the mixing effect and efficiency of the powder.

[0017] 3. A second mixing structure is provided in the aggregate premixing bin. The second mixing structure mixes the aggregate in the center of the second bin through the second mixing rod on the second central shaft, and mixes the aggregate at the edge of the second bin through the third mixing rod on the second rotating shaft, thereby improving the premixing effect of the aggregate.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mixing device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the mixing structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the powder premixing silo structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the powder premixing silo according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the first stirring structure according to an embodiment of the present invention; Figure 6 This is a partial structural diagram of the first stirring structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the sealing structure of the powder premixing silo according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the bottom structure of the powder premixing silo according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the aggregate premixing bin structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the cross-sectional structure of the aggregate premixing bin according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the second stirring structure according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the production system structure according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the aggregate bin structure according to an embodiment of the present invention.

[0020] Figure Labels 1. Mixer; 11. Mixing tank; 12. Connecting box; 13. First motor; 14. Protective shell; 15. Liquid inlet pipe; 16. First stirring shaft; 17. Second stirring shaft; 18. First driven gear; 19. Second driven gear; 110. Driving gear; 111. Fixed sleeve; 112. Connecting block; 113. Mixing block; 2. Powder premixing bin; 21. First chamber; 22. First cover; 23. First feed inlet; 24. First discharge outlet; 25. Second motor; 26. First rotating plate; 27. First fixed gear ring; 28. First gear; 29. ​​Rotating plate; 210. First rotating shaft; 211. Stirring blade; 212. Second gear; 213. Second fixed gear ring; 214. First central shaft; 215. First stirring rod; 216. Discharge rod; 217. Discharge blade; 218. Baffle; 219. Discharge outlet; 220. First sliding plate; 221. Second sliding plate; 222. Guide rail; 223. Transmission rod; 224. First connecting rod; 225. Second connecting rod; 226. Cylinder; 3. Aggregate premixing bin; 31. Second chamber; 32. Second cover; 33. Second feed inlet; 34. Second discharge outlet; 35. Third motor; 36. Connecting shaft; 37. Second rotating plate; 38. Second central shaft; 39. Second stirring rod; 310. Second rotating shaft; 311. Third stirring rod; 312. Third gear; 313. Third fixed gear ring; 4. Aggregate bin; 41. Storage bin; 42. Supporting grid plate; 43. Baffle plate; 44. Discharge bin; 45. Weighing hopper; 46. First conveyor belt; 47. Dust collection hood; 48. Conveying pipe; 49. Dust collector; 410. First collection hopper; 5. Second conveyor belt; 6. Powder silo; 7. Second collection hopper; 8. Conveyor; 9. Liquid tank. Detailed Implementation

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] like Figure 1As shown, a concrete mixing device includes a mixer 1, a connecting box 12 at the top of the mixer 1, and a mixing tank 11 at the bottom of the connecting box 12, with the mixing tank 11 connected to the connecting box 12. The mixing tank 11 has a mixing structure for mixing aggregates, powders, and liquids. The mixing tank 11 includes two symmetrically arranged and connected sub-tanks, with the mixing structure housed within each sub-tank. Mixing the raw materials through the two sub-tanks improves the mixing efficiency. The top of the connecting box 12 has a powder premixing chamber 2 and an aggregate premixing chamber 3. Premixing the powders and aggregates before they are discharged into the mixing tank 11 improves the mixing efficiency and effect of the aggregates and powders, and reduces component segregation. The connecting box 12 has two inlet pipes 15 for adding liquid to the mixing tank 11, located on both sides of the connecting box 12, which inject liquid into the two sub-tanks respectively. A discharge pipe is provided at the bottom of the mixing tank 11, and a sealing plate is provided at the outlet of the discharge pipe to prevent material leakage during the mixing process.

[0025] like Figure 2 As shown, the mixing structure includes a first stirring shaft 16 and a second stirring shaft 17 arranged axially along the mixing tank 11. The first stirring shaft 16 and the second stirring shaft 17 are respectively located on the central axes of two sub-tanks and are rotatably connected to the sub-tanks via bearings. Both the first stirring shaft 16 and the second stirring shaft 17 are equipped with mixing components, which are spaced apart and overlapped. The mixing components mix the raw materials, and the overlapping arrangement allows the raw materials in the two sub-tanks to mix with each other, improving the mixing effect. A first driven gear 18 is fixedly installed at one end of the first stirring shaft 16 outside the mixing tank 11, and a second driven gear 189 is fixedly installed at one end of the second stirring shaft 17 outside the mixing tank 11. A driving gear 110 is rotatably mounted on the mixing tank 11 via bearings, meshing with both the first driven gear 18 and the second driven gear 189. A protective shell 14 is fixedly installed on the mixing tank 11 to protect the first driven gear 18, the second driven gear 189, and the driving gear 110. The protective housing 14 is equipped with a first motor 13 that drives the drive gear 110 to rotate. The output shaft of the first motor 13 is rotatably connected to the protective housing 14 via bearings.

[0026] The mixing components are spirally distributed on both the first stirring shaft 16 and the second stirring shaft 17. Each mixing component includes a fixing sleeve 111, which is detachably connected to both the first stirring shaft 16 and the second stirring shaft 17 via screws. A connecting block 112 is fixedly mounted on the fixing sleeve 111, and a stirring block 113 is detachably mounted on the outside of the connecting block 112 via screws. The stirring block 113 is inclined. The detachable nature of the fixing sleeve 111 and the stirring block 113 facilitates their replacement.

[0027] like Figure 3 As shown, the powder premixing chamber 2 includes a first chamber 21, with a first cover 22 at the top of the first chamber 21, and the first cover 22 is fixedly connected to the first chamber 21 by screws. The first cover 22 has a first feed inlet 23 and a first stirring structure for premixing the powder. The bottom of the first chamber 21 is connected to the connecting box 12 through a first discharge outlet 24.

[0028] like Figure 4 , Figure 5 , Figure 6 As shown, the first stirring structure includes a first rotating plate 26, which is coaxially arranged with the first chamber 21 and rotatably connected to the first cover 22 via bearings. A second motor 25 is mounted on the first cover 22 to drive the first rotating plate 26 to rotate. A first central shaft 214 is fixedly mounted at the center of the first rotating plate 26, and several first stirring rods 215 for stirring the powder are mounted on the first central shaft 214. Several auxiliary stirring components are rotatably mounted on the first rotating plate 26 via bearings, and the auxiliary stirring components are arranged in a circular array around the first central shaft 214. The first rotating plate 26 drives the auxiliary stirring components to rotate, thus stirring and mixing the powder.

[0029] The auxiliary stirring assembly includes a rotating plate 29. A secondary shaft is fixedly mounted at one end of the rotating plate 29, and the secondary shaft is rotatably connected to the first rotating plate 26 via a bearing. A first gear 28 is fixedly mounted at the top end of the secondary shaft, and the first gear 28 meshes with a first fixed gear ring 27 fixedly mounted on the lower surface of the first cover 22. A first rotating shaft 210 is rotatably mounted at the other end of the rotating plate 29 via a bearing. A second gear 212 is fixedly mounted at the top end of the first rotating shaft 210, and the second gear 212 meshes with a second fixed gear ring 213 fixedly mounted on the first rotating plate 26. The first rotating shaft 210 is equipped with several spiral stirring blades 211 for stirring the powder.

[0030] The powder in the first chamber 21 is mixed by the first stirring rod 215 on the first central shaft 214, and the powder at the inner edge of the first chamber 21 is stirred and mixed by the stirring blade 211 on the first rotating shaft 210, thereby improving the mixing effect and efficiency of the powder.

[0031] like Figure 7 , Figure 8As shown, the bottom of the first chamber 21 is provided with a sealing structure for controlling the discharge of powder. The sealing structure includes a first sliding plate 220 and a second sliding plate 221 arranged opposite to each other. The first sliding plate 220 and the second sliding plate 221 are located on both sides of the discharge rod 216 and are rotatably connected to the discharge rod 216 in a sealed manner. The discharge rod 216 is located at the bottom of the first central shaft 214 and is coaxially and fixedly connected to the first central shaft 214. The discharge rod 216 is located inside the first discharge port 24, and is provided with spiral discharge blades 217 to facilitate the discharge of powder. The first sliding plate 220 and the second sliding plate 221 are arranged on a baffle 218, which is located at the bottom of the first chamber 21 and is fixedly connected to the inner wall of the first chamber 21. The baffle 218 has a discharge port 219 at its center for discharging powder, which is blocked by the first sliding plate 220 and the second sliding plate 221. A guide rail 222 is fixedly installed on the baffle 218 to guide the sliding of the first slide plate 220 and the second slide plate 221. A transmission rod 223 is installed between both ends of the first slide plate 220 and the second slide plate 221, and the middle part of the transmission rod 223 is rotatably connected to the baffle 218 via a bearing. Both ends of the transmission plate are hinged to the first slide plate 220 and the second slide plate 221 via a first connecting rod 224 and a second connecting rod 225 respectively, realizing the synchronous reverse sliding of the first slide plate 220 and the second slide plate 221. A cylinder 226 is installed at the bottom of the baffle 218 to drive the second slide plate 221 to slide.

[0032] like Figure 9 As shown. The aggregate premixing bin 3 includes a second bin 31, with a second cover 32 at the top of the second bin 31, and the second cover 32 is fixedly connected to the second bin 31 by screws. The second cover 32 has a second inlet 33 for allowing aggregate to enter the second bin 31. A second mixing structure for premixing the aggregate is located at the center of the second cover 32. The bottom of the second bin 31 has a second discharge port 34 communicating with the connecting box 12. A valve for controlling the opening and closing of the second discharge port 34 is provided at the second discharge port 34; the valve adopts an existing structure.

[0033] like Figure 10 , Figure 11As shown, the second stirring structure includes a second rotating plate 37, which is located inside and coaxially arranged with the second chamber 31. A third motor 35, which drives the second rotating plate 37 to rotate, is mounted on the second cover 32. The output shaft of the third motor 35 is fixedly connected to the center of the second rotating plate 37 via a connecting shaft 36. The connecting shaft 36 is rotatably connected to the second cover 32 via bearings. A second central shaft 38 is fixedly mounted at the center of the lower surface of the second rotating plate 37, and several second stirring rods 39 are mounted on the second central shaft 38. Several second rotating shafts 310 are rotatably mounted on the second rotating plate 37 via bearings, and several third stirring rods 311 are mounted on the second rotating shafts 310. The third stirring rods 311 are staggered and overlapped with the second stirring rods 39. A third gear 312 is fixedly mounted at the top of the second rotating shaft 310, and the third gear 312 meshes with a third fixed gear ring 313 fixedly mounted on the second cover 32.

[0034] The second mixing structure mixes the aggregate at the center of the second chamber 31 with the second mixing rod 39 on the second central shaft 38, and mixes the aggregate at the edge of the second chamber 31 with the third mixing rod 311 on the second rotating shaft 310, thereby improving the premixing effect of the aggregate.

[0035] like Figure 12 As shown, a concrete production system includes a concrete mixing device. An aggregate bin 4 is located on one side of a mixer 1, and the aggregate in the aggregate bin 4 is connected to an aggregate premix bin 3 via a second conveyor belt 5. A powder bin 6 is located on the other side of the mixer 1, and a second collection hopper 7 is located at the bottom of the powder bin 6. The second collection hopper 7 is connected to the powder premix bin 2 via a conveyor 8. The conveyor 8 can be an existing screw conveyor. A liquid inlet pipe 15 in a connecting box 12 is connected to a liquid tank 9 via a connecting pipe, and a control valve is installed on the connecting pipe.

[0036] like Figure 13As shown, the aggregate bin has four storage compartments 41, each containing several sub-compartments, each for holding aggregates of different sizes. A support grid 42 is inclined at the top of each sub-compartment, with the aggregates positioned above it. At the bottom of the storage bin 41 are discharge bins 44, each corresponding to a sub-compartment. A vibrating motor is located below the support grid 42, facilitating the aggregates to fall through the grid into the discharge bins 44. A valve controls the opening and closing of each discharge bin 44. At the bottom of each discharge bin 44 are corresponding weighing hoppers 45, used for weighing the aggregates and proportioning them according to gradation. A valve controls the opening and closing of each weighing hopper 45. A first conveyor belt 46 is installed below the weighing hopper 45, which transports the aggregate to a first collection hopper 410 at its end. A second conveyor belt 5 is located below the first collection hopper 410. Partitions 43 are installed between the sub-hoppers to prevent mixing of different aggregates. A dust collection hood 47 is installed above the storage hopper 41, and the top of the dust collection hood 47 is connected to a dust collector 49 via a conveying pipe 48.

[0037] The production method based on the above concrete production system includes the following steps: S1. The aggregate in aggregate bin 4 falls into weighing hopper 45 for weighing. The weighed aggregate falls into first conveyor belt 46 and then into first collection hopper 410 for temporary storage. The aggregate in first collection hopper 410 is then conveyed into aggregate premix bin 3 via second conveyor belt 5. Dust in aggregate bin 4 enters dust collector 49 for dust removal through dust collection hood 47 and conveying pipe 48. The air after dust removal is discharged through fan and exhaust pipe.

[0038] S2. The powder in the powder silo 6 falls into the second collection silo for temporary storage. The powder in the second collection silo enters the powder premixing silo 2 through the conveyor 8.

[0039] S3. The second motor 25 starts, driving the first rotating plate 26 to rotate. The first rotating plate 26 drives the first central shaft 214 to rotate, and the first central shaft 214 drives the first stirring rod 215 to rotate, thus stirring the powder in the center of the first chamber 21. The first rotating plate 26 drives the secondary shaft to rotate synchronously. Under the action of the first fixed gear ring 27, the first gear 28 drives the secondary shaft to rotate. The secondary shaft drives the rotating plate 29 to rotate synchronously. The rotating plate 29 drives the first rotating shaft 210 to rotate. Under the action of the second fixed gear ring 213, the second rotating shaft 212 drives the first rotating shaft 210 to rotate. The second rotating shaft 310 drives the stirring blade 211 to rotate around the first central shaft 214 and rotate around the secondary shaft while also rotating, thus mixing the powder in the first chamber 21.

[0040] S4. After the powder is mixed, the first cylinder 226 retracts, driving the second slide plate 221 to slide along the guide rail 222. The second slide plate 221, through the second connecting rod 225, transmission rod 223, and first connecting rod 224, drives the first slide plate 220 to slide in the opposite direction along the guide rail 222. The discharge port 219 opens, and the mixed powder is discharged through the discharge port 219. The first central shaft 214 drives the discharge rod 216 to rotate, and the discharge rod 216 drives the discharge blade 217 to rotate. The discharge blade 217 assists in the discharge of powder. The powder is discharged into the mixing tank 11 through the first discharge port 24. S5. Simultaneously with the premixing of the powder, the third motor 35 starts. The third motor 35 drives the second rotating plate 37 to rotate via the connecting shaft 36. The second rotating plate 37 drives the second central shaft 38 to rotate, and the second central shaft 38 drives the second stirring rod 39 to rotate. The second rotating plate 37 drives the second rotating shaft 310 to rotate. Under the action of the third fixed gear ring 313, the third gear 312 drives the second rotating shaft 310 to rotate. The second rotating shaft 310 drives the third stirring rod 311 to rotate, premixing the aggregate. The premixed aggregate is discharged into the mixing tank 11 through the second discharge port 34.

[0041] S6. The liquid in the liquid tank 9 enters the mixing tank 11 through the connecting pipe and the liquid inlet pipe 15, and mixes with the aggregate and powder. The first motor 13 is started. The first motor 13 drives the first stirring shaft 16 and the second stirring shaft 17 to rotate through the driving gear 110, the first driven gear 18, and the second driven gear 189. The first stirring shaft 16 and the second stirring shaft 17 mix the raw materials through the stirring block 113. The mixed material is discharged through the discharge pipe at the bottom of the mixing tank 11.

[0042] Therefore, the concrete mixing device, production system and production method described in this invention can solve the problems of low mixing efficiency and unevenness in existing concrete.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A concrete mixing device, characterized in that: The system includes a mixer, a connecting box at the top of which is connected to a mixing chamber at the bottom. The mixing chamber is connected to the connecting box. The mixing chamber has a mixing structure for mixing aggregates, powders, and liquids. The connecting box has a powder premixing chamber and an aggregate premixing chamber at the top. The powder premixing chamber has a first mixing structure for premixing the powders, and the aggregate premixing chamber has a second mixing structure for premixing the aggregates. The connecting box has an inlet pipe for adding liquid to the mixing chamber, and the mixing chamber has a discharge pipe at the bottom.

2. The concrete mixing device according to claim 1, characterized in that: The mixing tank includes two symmetrical and connected sub-tanks, and a mixing structure is disposed within each sub-tank. The mixing structure includes a first mixing shaft and a second mixing shaft arranged along the axial direction of the mixing tank. The first and second mixing shafts are respectively located within the two sub-tanks and are rotatably connected to them. Both the first and second mixing shafts are equipped with mixing components, which are spaced apart and overlapped. A first driven gear is disposed at one end of the first mixing shaft outside the mixing tank, and a second driven gear is disposed at one end of the second mixing shaft outside the mixing tank. A driving gear is rotatably disposed on the mixing tank, meshing with both the first and second driven gears. A protective shell is disposed on the mixing tank to protect the first driven gear, the second driven gear, and the driving gear. A first motor that drives the driving gear to rotate is disposed on the protective shell.

3. A concrete mixing device according to claim 2, characterized in that: The mixing components are spirally distributed on both the first and second stirring shafts. The mixing components include a fixed sleeve, which is detachably connected to the first and second stirring shafts. A connecting block is fixedly installed on the fixed sleeve, and a stirring block is detachably installed on the outside of the connecting block. The stirring block is inclined.

4. A concrete mixing device according to claim 3, characterized in that: The powder premixing silo includes a first chamber, a first cover at the top of the first chamber, a first inlet on the first cover, a first stirring structure on the first cover, and a connecting box at the bottom of the first chamber via a first discharge port. The first stirring structure includes a first rotating plate, which is coaxially arranged with the first chamber and rotatably connected to the first cover. A second motor that drives the first rotating plate to rotate is provided on the first cover. A first central shaft is provided at the center of the first rotating plate, and a first stirring rod for stirring the powder is provided on the first central shaft. Several auxiliary stirring components are rotatably arranged on the first rotating plate, and the auxiliary stirring components are arranged in a circular array around the first central shaft. The first rotating plate drives the auxiliary stirring components to rotate, thereby stirring and mixing the powder.

5. A concrete mixing device according to claim 4, characterized in that: The auxiliary stirring assembly includes a rotating plate, with a secondary shaft at one end of the rotating plate. The secondary shaft is rotatably connected to the first rotating plate. A first gear is provided at the top of the secondary shaft, and the first gear meshes with a first fixed gear ring fixedly provided on the lower surface of the first cover. A first rotating shaft is rotatably provided at the other end of the rotating plate. A second gear is provided at the top of the first rotating shaft, and the second gear meshes with a second fixed gear ring fixedly provided on the first rotating plate. Several spiral stirring blades for stirring the powder are provided on the first rotating shaft.

6. A concrete mixing device according to claim 5, characterized in that: The bottom of the first chamber is provided with a sealing structure for controlling the discharge of powder. The sealing structure includes a first sliding plate and a second sliding plate arranged opposite to each other. The first sliding plate and the second sliding plate are located on both sides of the discharge rod and are rotatably connected to the discharge rod in a sealed manner. The discharge rod is located at the bottom of the first central shaft and is fixedly connected to the first central shaft coaxially. The discharge rod is located inside the first discharge port and is provided with spiral discharge blades to facilitate the discharge of powder. The first sliding plate and the second sliding plate are set on a baffle. The baffle is located at the bottom of the first chamber and is fixedly connected to the inner wall of the first chamber. The center of the baffle is provided with a discharge port for discharging powder. The first sliding plate and the second sliding plate block the discharge port. The baffle is provided with a guide rail that guides the sliding of the first sliding plate and the second sliding plate. A transmission rod is provided between both ends of the first sliding plate and the second sliding plate. The middle part of the transmission rod is rotatably connected to the baffle. The two ends of the transmission plate are respectively hinged to the first sliding plate and the second sliding plate through a first connecting rod and a second connecting rod. The bottom end of the baffle is provided with a cylinder that drives the second sliding plate to slide.

7. A concrete mixing device according to claim 6, characterized in that: The aggregate premixing bin includes a second chamber, a second cover at the top of the second chamber, a second inlet on the second cover for the aggregate to enter the second chamber, a second mixing structure on the second cover, a second discharge port at the bottom of the second chamber communicating with a connecting box, and a valve at the second discharge port for controlling its opening and closing; the second mixing structure includes a second rotating plate located inside the second chamber and coaxially arranged with it, a third motor on the second cover for driving the second rotating plate to rotate, the output shaft of the third motor being fixedly connected to the center of the second rotating plate via a connecting shaft, a second central shaft fixedly arranged at the center of the lower surface of the second rotating plate, a plurality of second mixing rods arranged on the second central shaft, a plurality of second rotating shafts rotatably arranged on the second rotating plate, a plurality of third mixing rods arranged on the second rotating shafts, the third mixing rods being staggered from the second mixing rods, a third gear at the top of the second rotating shaft, the third gear meshing with a third fixed gear ring fixedly arranged on the second cover.

8. A concrete production system, characterized in that: The concrete mixing device according to claim 7 includes an aggregate bin on one side of the mixer, the aggregate in the aggregate bin being connected to the aggregate premix bin via a second conveyor belt, a powder bin on the other side of the mixer, a second collection hopper at the bottom of the powder bin being connected to the powder premix bin via a conveyor, and an inlet pipe in the connecting box being connected to the liquid tank via a connecting pipe.

9. A concrete production system according to claim 8, characterized in that: The aggregate bin includes a storage bin, which contains several sub-bins. Each sub-bin has a sloping support grid at its top, with the aggregate positioned above the grid. At the bottom of the storage bin are corresponding discharge bins, each with a valve at its bottom for control. Each discharge bin also has a corresponding weighing hopper at its bottom, with a valve at its bottom for control. Below the weighing hoppers is a first conveyor belt that transports the aggregate to a first collection hopper at its end. A second conveyor belt is located below the first collection hopper. A vibrating motor is positioned below the support grid, and partitions separate the sub-bins. A dust collection hood is installed above the storage bin, with its top connected to a dust collector via a conveying pipe.

10. A production method based on the concrete production system of claim 9, characterized in that, Includes the following steps: S1. The aggregate in the aggregate bin falls into the weighing hopper for weighing. The weighed aggregate falls into the first conveyor belt and then into the first collection hopper for temporary storage. The aggregate in the first collection hopper is then sent into the aggregate premixing bin via the second conveyor belt. The dust in the aggregate bin enters the dust collector through the dust collection hood and conveying pipe for dust removal. The air after dust removal is discharged through the fan and exhaust pipe. S2. The powder in the powder silo falls into the second collection silo for temporary storage, and the powder in the second collection silo enters the powder premixing silo through the conveyor. S3. The second motor starts, driving the first rotating plate to rotate. The first rotating plate drives the first central shaft to rotate, and the first central shaft drives the first stirring rod to rotate, stirring the powder in the center of the first chamber. The first rotating plate drives the secondary shaft to rotate synchronously. Under the action of the first fixed gear ring, the first gear drives the secondary shaft to rotate, and the secondary shaft drives the rotating plate to rotate synchronously. The rotating plate drives the first rotating shaft to rotate. Under the action of the second fixed gear ring, the second gear drives the first rotating shaft to rotate. The second rotating shaft drives the stirring blades to rotate around the first central shaft and rotate around the secondary shaft while rotating on their own axis, mixing the powder in the first chamber. S4. After the powder is mixed, the first cylinder retracts, driving the second slide plate to slide along the guide rail. The second slide plate, through the second connecting rod, transmission rod, and first connecting rod, drives the first slide plate to slide in the opposite direction along the guide rail, opening the discharge port and discharging the mixed powder through the discharge port. The first central shaft drives the discharge rod to rotate, which in turn drives the discharge blades to rotate, assisting in the discharge of the powder. The powder is discharged into the mixing tank through the first discharge port. S5. While the powder is being premixed, the third motor starts. The third motor drives the second rotating plate to rotate through the connecting shaft. The second rotating plate drives the second central shaft to rotate. The second central shaft drives the second stirring rod to rotate. The second rotating plate drives the second rotating shaft to rotate. Under the action of the third fixed gear ring, the third gear drives the second rotating shaft to rotate. The second rotating shaft drives the third stirring rod to rotate, premixing the aggregate. The premixed aggregate is discharged into the mixing tank through the second discharge port. S6. The liquid in the liquid tank enters the mixing tank through the connecting pipe and the liquid inlet pipe, and is mixed with the aggregate and powder. The first motor is started. The first motor drives the first mixing shaft and the second mixing shaft to rotate through the drive gear, the first driven gear and the second driven gear. The first mixing shaft and the second mixing shaft mix the raw materials through the mixing block. The mixed material is discharged through the discharge pipe at the bottom of the mixing tank.

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