Concrete dry material stirring device

Abstract

The utility model provides a concrete dry material stirring device in the technical field of concrete production equipment, which comprises a stirring mechanism and a feeding mechanism, the feeding mechanism is communicated with the top of the stirring mechanism, the stirring mechanism comprises a stirring tank and a first support frame, the stirring tank is arranged in the first support frame, the interior of the stirring tank is divided into a stirring area and a discharging area, a spiral stirring shaft is arranged in the stirring tank, a central spiral blade, an equal-diameter spiral blade and a variable-diameter spiral blade are arranged on the spiral stirring shaft, the spiral directions of the equal-diameter spiral blade and the variable-diameter spiral blade are the same, and the spiral directions of the central spiral blade, the equal-diameter spiral blade and the variable-diameter spiral blade are opposite; the central spiral blade coincides with the virtual central axis of the spiral stirring shaft and is fixedly connected with the outer side wall of the spiral stirring shaft, the bottom of the equal-diameter spiral blade is fixedly connected with the bottom of the variable-diameter spiral blade, and the outer side edge of the equal-diameter spiral blade is attached to the inner side wall of the upper portion of the stirring area. The outer side edge of the variable-diameter spiral blade is attached to the inner side wall of the lower portion of the stirring area, and the outer edge of the bottom of the center spiral blade is attached to the inner side wall of the discharging area. The equal-diameter spiral blade and the variable-diameter spiral blade are tightly attached to the inner side wall of the stirring area in the stirring process, stirring dead angles are reduced, the bottom of the center spiral blade is arranged in the discharging area, dead angles in the discharging area are avoided, meanwhile, discharging is facilitated, and blocking is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete production equipment, and particularly relates to a dry material mixing device for high-ductility concrete. Background Art

[0002] High-ductility concrete is mainly composed of raw materials such as cementitious materials, aggregates, admixtures and synthetic fibers. The cementitious material generally selects high-strength grade Portland cement. The admixtures are mainly water reducers, plasticizers and preservatives, which are used to improve the workability and ductility of the concrete. The synthetic fibers select high-strength and high-modulus fiber reinforcement materials, such as polypropylene coarse fibers, polyvinyl alcohol fibers, polypropylene microfibers, etc. The synthetic fiber is the core material of high-ductility concrete. Because of the pulling of the fibers, the concrete will have the performance of high ductility. High-ductility concrete has high strength, high toughness, high crack resistance and high damage resistance ability, and its deformation ability far exceeds that of ordinary concrete.

[0003] When producing high-ductility concrete, to ensure that synthetic fibers are fully dispersed to form a uniform mixture, the mixture needs to be put into a mixer according to the designed mix ratio for uniform mixing. However, currently, most high-ductility concrete processing processes require manual feeding and mixing through a mixer. The discharging methods of the mixer are divided into tilting type and non-tilting type. The tilting type discharges materials by tilting the mixing drum, and the non-tilting type discharges materials by reversing the mixing drum. No matter which discharging method is used, there will be residues in the mixing drum and it needs to be cleaned thoroughly. Otherwise, it will affect the ratio of each raw material during the next mixing and stirring. Secondly, it cannot discharge materials quantitatively and can only mix and stir in small batches multiple times, which is inconvenient to use. For example, a positive and negative rotation reciprocating alternating type raw material ratio mechanism for high-ductility concrete processing disclosed in Chinese Patent No.: ZL202021031667.5, including a protective shell, the upper end of the protective shell is rotatably connected with a placement plate, a driven gear is arranged on the periphery of the placement plate, the upper end of one end of the protective shell is screwed with a second motor, the output end of the second motor is clamped and connected with a driving wheel, the driving wheel and the driven gear are connected by meshing, the lower end of the placement plate is rotatably connected with six second transmission shafts. While the first motor drives the first turbine blade to rotate forward, it drives the second turbine blade to rotate in reverse. The second motor drives the six rotating second turbine blades to rotate inside the protective shell, thus greatly improving the stirring efficiency of the device. However, this technical solution cannot stir the inner side wall and the bottom of the protective shell during stirring, resulting in uneven mixing of raw materials. Some raw materials adhering to the inner side wall of the protective shell accumulate and remain. It needs to be cleaned before each use, and the cleaning difficulty is also large. Secondly, due to the existence of the discharge pipe, the raw materials put in before stirring will fall into the discharge pipe and cannot be mixed with other raw materials, resulting in a change in the raw material mix ratio. When discharging, the first part discharged is also the part of the raw materials that have not been stirred and have always existed in the discharge pipe, resulting in the product quality not meeting the requirements. Finally, the inner diameter of the discharge pipe welded to the lower end of the protective shell is smaller than the inner diameter of the outer shell, and there is a problem of blockage during discharging as much as possible. Summary of the Invention

[0004] The technical problem to be solved by the present utility model is how to improve the stirring efficiency of high-ductility concrete dry materials, prevent the problem of uneven mixing caused by stirring dead corners, and how to improve the discharging efficiency after mixing and prevent the problem of raw material blockage during discharging. The purpose of the present utility model is to provide a concrete dry material stirring device with high stirring and mixing efficiency, reduced stirring dead corners, and convenient feeding.

[0005] The technical solution adopted by the present utility model is as follows: a dry concrete mixing device, comprising a mixing mechanism and a feeding mechanism, the feeding mechanism being communicated with the top of the mixing mechanism. The mixing mechanism includes a mixing tank and a first support frame, the mixing tank being arranged within the first support frame. The mixing tank is divided into a mixing area and a discharging area, and a spiral mixing shaft is provided within the mixing tank. The spiral mixing shaft is provided with a central spiral blade, an equal-diameter spiral blade, and a variable-diameter spiral blade. The spiral directions of the equal-diameter spiral blade and the variable-diameter spiral blade are the same, while the spiral direction of the central spiral blade is opposite to that of the equal-diameter spiral blade and the variable-diameter spiral blade. The central spiral blade coincides with the virtual central axis of the spiral mixing shaft and is fixedly connected to the outer sidewall of the spiral mixing shaft. The bottom of the equal-diameter spiral blade is fixedly connected to the bottom of the variable-diameter spiral blade, and the outer edge of the equal-diameter spiral blade is in mutual contact with the inner sidewall of the upper part of the mixing area. The outer edge of the variable-diameter spiral blade is in mutual contact with the inner sidewall of the lower part of the mixing area, and the outer edge of the bottom of the central spiral blade is in mutual contact with the inner sidewall of the discharging area.

[0006] The following beneficial effects can be obtained by using the dry concrete mixing device provided by the present utility model:

[0007] (1) A spiral mixing shaft composed of a central spiral blade, an equal-diameter spiral blade, and a variable-diameter spiral blade is adopted. Since the spiral directions of the central spiral blade, the equal-diameter spiral blade, and the variable-diameter spiral blade are all opposite, when the spiral mixing shaft rotates forward, the equal-diameter spiral blade and the variable-diameter spiral blade will push the mixed materials from top to bottom and from the sidewall to the center, while the central spiral blade will push the mixed materials from bottom to top, accelerating the mixing speed of the mixed materials and at the same time preventing the synthetic fibers in the mixed materials from entangling and agglomerating with each other, thus improving the quality of the high-ductility concrete dry mix.

[0008] (2) By making the outer edge of the equal-diameter spiral blade in mutual contact with the inner sidewall of the upper part of the mixing area and the outer edge of the variable-diameter spiral blade in mutual contact with the inner sidewall of the lower part of the mixing area, it can closely adhere to the inner wall of the mixing area during mixing, reducing the mixing dead angle and making the material mixing more uniform.

[0009] (3) By making the spiral directions of the central spiral blade, the equal-diameter spiral blade, and the variable-diameter spiral blade all opposite, when the spiral mixing shaft rotates in reverse, the equal-diameter spiral blade and the variable-diameter spiral blade will stir the high-ductility concrete dry material on the inner wall of the mixing area upward, while the central spiral blade will push the high-ductility concrete dry material downward to the discharging area, thus facilitating discharging and collecting after mixing and controlling the discharging speed, and at the same time preventing blockage during discharging.

[0010] Preferably, both the equal-diameter spiral blade and the variable-diameter spiral blade are fixedly connected to the outer sidewall of the spiral mixing shaft through connecting rods.

[0011] Connect the equal-diameter spiral blade and the variable-diameter spiral blade to the spiral stirring shaft through a connecting rod to fix the positions and shapes of the equal-diameter spiral blade and the variable-diameter spiral blade, and make the outer edges of the equal-diameter spiral blade and the variable-diameter spiral blade always fit the inner wall of the stirring area during stirring.

[0012] Preferably, the height of the central spiral blade is equal to the height of the stirring tank, and the sum of the heights of the equal-diameter spiral blade and the variable-diameter spiral blade is equal to the height of the stirring area in the stirring tank.

[0013] The bottom of the central spiral blade always fits the bottom of the feeding area. During stirring, it can drive the raw materials in the feeding area upward to the stirring area to prevent the existence of stirring dead angles. The equal-diameter spiral blade and the variable-diameter spiral blade in the stirring area can then push the raw materials at the top of the stirring area downward from the side wall to prevent the raw materials from gathering on the inner wall of the stirring tank. Thus, all the raw materials in the stirring tank can be mixed with each other during stirring to prevent the existence of stirring dead angles. During discharging, the central stirring blade in the feeding area is used to push the material for discharging to prevent blockage during discharging.

[0014] Preferably, a tank cover is provided at the top of the stirring tank. A coupling and a reduction motor are provided in the middle of the tank cover. The lower end of the coupling is shaft-connected to the spiral stirring shaft, and the upper end of the coupling is shaft-connected to the power output shaft of the reduction motor.

[0015] The tank cover shields the stirring tank to prevent dust from being generated during the stirring process. The reduction motor provides power for the forward and reverse rotation of the spiral stirring shaft. The coupling connects the reduction motor and the spiral stirring shaft, and at the same time prevents the spiral stirring shaft from bearing excessive loads, playing a role of overload protection.

[0016] Preferably, a fan-shaped discharging port is provided at the bottom of the feeding area. A discharging baffle is provided below the feeding area. The discharging baffle is rotatably connected to the bottom of the feeding area, and an opening with the same shape and size as the discharging port is provided on the discharging baffle.

[0017] By rotating the discharging baffle, the opening and closing of the discharging port can be controlled. Discharging can start when the opening on the discharging baffle intersects or overlaps with the discharging port, and raw material leakage can be prevented when the discharging baffle shields the discharging port.

[0018] Preferably, the feeding mechanism includes a tubular screw conveyor and a feeding trough. A second support frame is provided in the middle of the tubular screw conveyor; the feeding trough is communicated with the inner side wall of the bottom of the tubular screw conveyor, and a feeding pipe is further provided on one side of the top of the tank cover. The feeding pipe is communicated with the outlet at the top of the tubular screw conveyor.

[0019] The tubular screw conveyor is fixed by the second support frame. Through the feeding chute and the pipe conveyor, the raw materials placed in the feeding chute can be conveyed into the mixing tank along the pipe conveyor from the feeding pipe at the top of the tank cover. Adding raw materials is time-saving and labor-saving.

[0020] Preferably, a plurality of fixing rods arranged at equal intervals are provided at the upper part of the feeding chute. Long strip-shaped sliding grooves are provided on both sides of the inner side wall of the feeding chute below the fixing rods. An activity frame is slidably connected in the sliding grooves. A plurality of moving rods parallel to and arranged at equal intervals with the fixing rods are provided in the activity frame. The distance between two adjacent moving rods is less than the distance between two adjacent fixing rods.

[0021] When the activity frame reciprocates, it drives the moving rods to reciprocate, so that the moving rods can move relative to the fixing rods, and can extrude and disperse some agglomerated gel materials to ensure uniform mixing.

[0022] Preferably, a third support frame is provided below the feeding chute, and the top of the third support frame is fixedly connected to the top of the feeding chute.

[0023] The third support frame fixes and lifts the feeding chute to prevent the feeding chute from directly contacting the ground and causing damage due to extrusion between the feeding chute and the ground during feeding.

[0024] Preferably, a support plate is provided on one side of the third support frame, a linear motor is fixed on the support plate, and one end of the mover of the linear motor is movably connected to the outer side wall of the activity frame.

[0025] The support plate supports and fixes the linear motor, and one end of the mover of the linear motor is connected to the outside of the activity frame, so as to drive the activity frame to reciprocate by the reciprocating movement of the linear motor.

[0026] Preferably, a protective housing is wrapped outside the linear motor and the support plate.

[0027] The protective housing protects the linear motor to prevent external dust from affecting the movement stroke of the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 is the front view of the present utility model;

[0031] Figure 3 is the sectional view of the present utility model;

[0032] Figure 4 is the sectional view of the mixing tank in the present utility model;

[0033] Figure 5 is the structural schematic diagram of the spiral stirring shaft in the present utility model;

[0034] Figure 6 is the three-dimensional structural schematic diagram of the upward viewing angle of the feeding area in the present utility model;

[0035] Figure 7 is the three-dimensional structural schematic diagram of the feeding chute in the present utility model;

[0036] Figure 8 is the present utility model Figure 7 The sectional view at A - A in;

[0037] Figure 9 is the present utility model Figure 7 The sectional view at B - B in.

[0038] Reference numerals: 1 - mixing mechanism, 11 - first support frame, 12 - mixing tank, 121 - mixing area, 122 - spiral stirring shaft, 1221 - central spiral blade, 1222 - equal - diameter spiral blade, 1223 - variable - diameter spiral blade, 1224 - connecting rod, 123 - feeding area, 1231 - feeding port, 1232 - feeding baffle, 13 - tank cover, 131 - coupling, 132 - reduction motor, 133 - feed pipe, 2 - feeding mechanism, 21 - tubular screw conveyor, 22 - second support frame, 23 - feeding chute, 231 - chute, 232 - fixed rod, 233 - movable frame, 2331 - moving rod, 24 - third support frame, 241 - support plate, 242 - linear motor, 243 - protective housing. Detailed implementation manners

[0039] Next, the technical solutions of the present utility model will be described clearly and completely in conjunction with the attached Figures 1-9 Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] Embodiment 1

[0042] The following is further described in conjunction with specific embodiments. Refer to Figures 1-9As shown in the figure, this embodiment is a dry concrete mixing device, including a mixing mechanism 1 and a feeding mechanism 2. The feeding mechanism 2 is connected to the top of the mixing mechanism 1. The mixing mechanism 1 includes a mixing tank 12 and a first support frame 11. The mixing tank 12 is arranged inside the first support frame 11. The mixing tank 12 is divided into a mixing area 121 and a discharging area 123. A spiral mixing shaft 122 is arranged inside the mixing tank 12. The spiral mixing shaft 122 is provided with a central spiral blade 1221, an equal-diameter spiral blade 1222 and a variable-diameter spiral blade 1223. The spiral directions of the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are the same, and the spiral direction of the central spiral blade 1221 is opposite to those of the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223. The central spiral blade 1221 coincides with the virtual central axis of the spiral mixing shaft 122 and is fixedly connected to the outer side wall of the spiral mixing shaft 122. The bottom of the equal-diameter spiral blade 1222 is fixedly connected to the bottom of the variable-diameter spiral blade 1223. The outer edge of the equal-diameter spiral blade 1222 is in mutual contact with the inner side wall of the upper part of the mixing area 121, and the outer edge of the variable-diameter spiral blade 1223 is in mutual contact with the inner side wall of the lower part of the mixing area 121. The outer edge of the bottom of the central spiral blade 1221 is in mutual contact with the inner side wall of the discharging area 123. Since the spiral directions of the central spiral blade 1221, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are all opposite, when the spiral mixing shaft 122 rotates forward, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 push the mixed materials from top to bottom and from the side wall to the center, while the central spiral blade 1221 pushes the mixed materials from bottom to top, accelerating the mixing speed of the mixed materials. The outer edge of the equal-diameter spiral blade 1222 is in mutual contact with the inner side wall of the upper part of the mixing area 121, and the outer edge of the variable-diameter spiral blade 1223 is in mutual contact with the inner side wall of the lower part of the mixing area 121. During mixing, it can closely adhere to the inner wall of the mixing area 121, reducing the mixing dead angle and making the materials mix more evenly. When the spiral mixing shaft 122 rotates reversely, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 stir the high-ductility dry concrete on the inner wall of the mixing area 121 upward, and the central spiral blade 1221 pushes the high-ductility dry concrete downward to the discharging area 123, which is convenient for discharging and collecting after mixing and is convenient for controlling the discharging speed, while preventing blockage during discharging.

[0043] Refer to Figure 4As shown, in this embodiment, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are both fixedly connected to the outer wall of the spiral stirring shaft 122 through a connecting rod 1224. The equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are connected to the spiral stirring shaft 122 through the connecting rod 1224 to fix the positions and shapes of the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223. During stirring, the outer edges of the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are always in contact with the inner wall of the stirring zone 121.

[0044] Referring to Figure 4 As shown, in this embodiment, the height of the central spiral blade 1221 is equal to the height of the stirring tank 12, and the sum of the heights of the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 is equal to the height of the stirring zone 121 in the stirring tank 12. The bottom of the central spiral blade 1221 is always in contact with the bottom of the feeding zone 123. During stirring, the raw materials in the feeding zone 123 can be driven upward into the stirring zone 121 to prevent the existence of stirring dead angles. The equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 in the stirring zone 121 can push the raw materials at the top of the stirring zone 121 downward from the side wall to prevent the raw materials from gathering on the inner wall of the stirring tank 12, so that all the raw materials in the stirring tank 12 can be mixed with each other during stirring to prevent the existence of stirring dead angles. During discharging, the central stirring blade in the feeding zone 123 is used to push the material for discharging to prevent blockage during discharging.

[0045] Referring to Figures 1-3 As shown, in this embodiment, a tank cover 13 is provided at the top of the stirring tank 12. A coupling 131 and a reduction motor 132 are provided in the middle of the tank cover 13. The lower end of the coupling 131 is axially connected to the spiral stirring shaft 122, and the upper end of the coupling 131 is axially connected to the power output shaft of the reduction motor 132. The tank cover 13 shields the stirring tank 12 to prevent dust from being generated during the stirring process. The reduction motor 132 provides power for the forward and reverse rotation of the spiral stirring shaft 122. The coupling 131 connects the reduction motor 132 and the spiral stirring shaft 122, and at the same time prevents the spiral stirring shaft 122 from bearing excessive loads, playing a role in overload protection.

[0046] Referring to Figure 6As shown, in this embodiment, a sector-shaped blanking opening 1231 is provided at the bottom of the blanking area 123. A blanking baffle 1232 is provided below the blanking area 123. The blanking baffle 1232 is rotatably connected to the bottom of the blanking area 123. An opening with the same shape and size as the blanking opening 1231 is provided on the blanking baffle 1232. By rotating the blanking baffle 1232, the opening and closing of the blanking opening 1231 can be controlled. When the opening on the blanking baffle 1232 intersects or overlaps with the blanking opening 1231, discharging can start. When the blanking baffle 1232 blocks the blanking opening 1231, raw materials can be prevented from leaking out.

[0047] Referring to Figure 3 As shown, in this embodiment, the feeding mechanism 2 includes a tubular screw conveyor 21 and a feeding trough 23. A second support frame 22 is provided in the middle of the tubular screw conveyor 21; the feeding trough 23 communicates with the inner side wall at the bottom of the tubular screw conveyor 21. One side of the top of the tank cover 13 is also provided with a feeding pipe 133. The feeding pipe 133 communicates with the outlet at the top of the tubular screw conveyor 21. By fixing and replacing the tubular screw conveyor 21 through the second support frame 22, the raw materials placed in the feeding trough 23 can be conveyed into the mixing tank 12 along the tubular screw conveyor 21 from the feeding pipe 133 at the top of the tank cover 13 through the feeding trough 23 and the tubular screw conveyor 21, which saves time and effort in adding raw materials.

[0048] Referring to Figure 7 and Figure 9 As shown, in this embodiment, a plurality of fixing rods 232 arranged at equal intervals are provided at the upper part of the feeding trough 23. Long strip-shaped sliding grooves 231 are provided on both sides below the fixing rods 232 on the inner side wall of the feeding trough 23. A movable frame 233 is slidably connected in the sliding grooves 231. A plurality of moving rods 2331 parallel to and arranged at equal intervals with the fixing rods 232 are provided in the movable frame 233. The distance between two adjacent moving rods 2331 is less than the distance between two adjacent fixing rods 232. When the movable frame 233 reciprocates, the moving rods 2331 are driven to reciprocate, so that the moving rods 2331 can move relative to the fixing rods 232, and part of the agglomerated gel material can be extruded and dispersed to ensure uniform mixing.

[0049] Referring to Figures 7-9 As shown, in this embodiment, a third support frame 24 is provided below the feeding trough 23. The top of the third support frame 24 is fixedly connected to the top of the feeding trough 23. The feeding trough 23 is fixed and lifted through the third support frame 24 to prevent the feeding trough 23 from directly contacting the ground and being damaged due to extrusion between the feeding trough 23 and the ground during feeding.

[0050] Referring to Figure 8As shown, in this embodiment, a support plate 241 is provided on one side of the third support frame 24. A linear motor 242 is fixed on the support plate 241. One end of the mover of the linear motor 242 is movably connected to the outer sidewall of the movable frame 233. The linear motor 242 is supported and fixed by the support plate 241, and one end of the mover of the linear motor 242 is connected to the outside of the movable frame 233, so as to drive the movable frame 233 to reciprocate by the reciprocating movement of the linear motor 242.

[0051] Referring to Figure 7 or Figure 8 As shown, in this embodiment, a protective housing 243 is wrapped around the outer sides of the linear motor 242 and the support plate 241. The linear motor 242 is protected by the protective housing 243 to prevent external dust from affecting the movement stroke of the linear motor 242.

[0052] Embodiment 2

[0053] When using the present utility model, turn on the reduction motor 132, the tubular screw conveyor 21 and the linear motor 242, and input the raw materials of the high-ductility concrete into the feeding trough 23 according to the designed mixing ratio of the raw materials. Use the tubular screw conveyor 21 below the feeding trough 23 to transport the raw materials from the feeding pipe 133 at the top of the tank cover 13 into the mixing tank 12. When there are raw materials agglomerating or entangling with each other, use the linear motor 242 to drive the movable frame 233 to reciprocate in the chute 231, and the moving rod 2331 in the movable frame 233 reciprocates accordingly, forming a relative movement with the fixed rod 232 above the movable frame 233. Use the shearing force generated by the relative movement of the moving rod 2331 and the fixed rod 232 to disperse the raw materials, preventing the raw materials that are agglomerated or entangled with each other from entering the mixing tank 12;

[0054] During stirring, the spiral stirring shaft 122 drives the central spiral blade 1221, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 to move and rotate. Since the spiral directions of the central spiral blade 1221, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 are different, when the spiral stirring shaft 122 rotates forward, the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223 push the raw materials downward from the side wall of the mixing tank 12 for mixing, and the central spiral blade 1221 drives the raw materials upward in the middle of the mixing tank 12. After the raw materials rise to the upper surface, they are automatically replenished to the side wall of the mixing tank 12 as the raw materials at the side wall move downward, and then are pushed downward by the equal-diameter spiral blade 1222 and the variable-diameter spiral blade 1223, and circulate in turn to accelerate the mixing of various parts in the raw materials; since the outer edge of the equal-diameter spiral blade 1222 is in mutual fit with the inner side wall of the upper part of the stirring area 121, and the outer edge of the variable-diameter spiral blade 1223 is in mutual fit with the inner side wall of the lower part of the stirring area 121, there is no stirring dead angle in the stirring area 121 during the stirring process, preventing some raw materials from adhering to the inner side wall of the mixing tank 12 and affecting the mixing ratio of each raw material;

[0055] After the stirring is completed, rotate the blanking baffle 1232 so that the opening on the blanking baffle 1232 aligns with the blanking port 1231 to expose the blanking port 1231. Then, the reduction motor 132 rotates in reverse, and the central spiral blade 1221 that rotates with the spiral stirring shaft 122 pushes the mixed raw materials downward to the blanking area 123, and finally discharges from the blanking port 1231 at the bottom of the blanking area 123. The pushing of the central spiral blade 1221 can effectively prevent blockage during the discharging process, and at the same time, it is convenient to accurately control the discharging amount by using the central spiral blade 1221.

[0056] The directional terms mentioned in the present utility model, such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] The standard parts used in this application document can all be purchased from the market, and can also be customized according to the records of the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machines, parts and equipment all adopt conventional models in the prior art.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A concrete dry material mixing device, comprising a mixing mechanism (1) and a feeding mechanism (2), wherein the feeding mechanism (2) is connected to the top of the mixing mechanism (1), and is characterized in that: The stirring mechanism (1) comprises a stirring tank (12) and a first support frame (11); the stirring tank (12) is arranged in the first support frame (11); the stirring tank (12) is divided into a stirring area (121) and a material discharge area (123); a spiral stirring shaft (122) is arranged in the stirring tank (12); a central spiral blade (1221), a spiral blade of equal diameter (1222) and a spiral blade of variable diameter (1223) are arranged on the spiral stirring shaft (122); the spiral directions of the spiral blades of equal diameter (1222) and the spiral blades of variable diameter (1223) are the same; the central spiral blade (1221) is connected to the spiral blades of equal diameter (1222) and the spiral blades of variable diameter (1223); The spiral directions of the central spiral blade (1221) are opposite; the central spiral blade (1221) coincides with the virtual central axis of the spiral stirring shaft (122) and is fixedly connected to the outer wall of the spiral stirring shaft (122); the bottom of the equal-diameter spiral blade (1222) is fixedly connected to the bottom of the variable-diameter spiral blade (1223); the outer edge of the equal-diameter spiral blade (1222) is in contact with the inner wall of the upper part of the stirring zone (121); the outer edge of the variable-diameter spiral blade (1223) is in contact with the inner wall of the lower part of the stirring zone (121); and the outer edge of the bottom of the central spiral blade (1221) is in contact with the inner wall of the discharge zone (123).

2. The dry concrete mixing device according to claim 1, characterized in that: The equal-diameter spiral blade (1222) and the variable-diameter spiral blade (1223) are both fixedly connected to the outer side wall of the spiral stirring shaft (122) via a connecting rod (1224).

3. The dry concrete mixing device according to claim 2, characterized in that: The height of the central spiral blade (1221) is equal to the height of the stirring tank (12), and the sum of the heights of the equal-diameter spiral blade (1222) and the variable-diameter spiral blade (1223) is equal to the height of the stirring zone (121) in the stirring tank (12).

4. The dry concrete mixing device according to claim 1, characterized in that: The top of the stirring tank (12) is provided with a tank cover (13), and the middle of the tank cover (13) is provided with a coupling (131) and a reduction motor (132), the lower end of the coupling (131) is axially connected to the spiral stirring shaft (122), and the upper end of the coupling (131) is axially connected to the power output shaft of the reduction motor (132).

5. The dry concrete mixing device according to claim 1, characterized in that: A fan-shaped material discharge port (1231) is provided at the bottom of the material discharge area (123), a material discharge baffle (1232) is provided below the material discharge area (123), the material discharge baffle (1232) is rotatably connected to the bottom of the material discharge area (123), and an opening having the same shape and size as the material discharge port (1231) is provided on the material discharge baffle (1232).

6. The dry concrete mixing device according to claim 4, characterized in that: The feeding mechanism (2) comprises a tubular screw conveyor (21) and a feeding trough (23); a second support frame (22) is provided in the middle of the tubular screw conveyor (21), and a third support frame (24) is provided below the feeding trough (23); the feeding trough (23) is communicated with the inner side wall of the bottom of the tubular screw conveyor (21); a feeding pipe (133) is also provided on one side of the top of the tank cover (13); the feeding pipe (133) is communicated with the outlet at the top of the tubular screw conveyor (21).

7. The dry concrete mixing device according to claim 6, characterized in that: A plurality of fixed rods (232) arranged at equal intervals are provided at the upper part of the feeding chute (23); and through-going long strip-shaped slide grooves (231) are provided on both sides of the inner side wall of the feeding chute (23) below the fixed rods (232); a movable frame (233) is slidably connected in the slide groove (231); and a plurality of movable rods (2331) are provided in the movable frame (233) and are parallel to the fixed rods (232) and arranged at equal intervals; and a distance between two adjacent movable rods (2331) is smaller than a distance between two adjacent fixed rods (232).

8. The dry concrete mixing device according to claim 7, characterized in that: A third support frame (24) is provided below the material loading chute (23), and the top of the third support frame (24) is fixedly connected to the top of the material loading chute (23).

9. The dry concrete mixing device according to claim 8, characterized in that: A support plate (241) is provided on one side of the third support frame (24), a linear motor (242) is fixed on the support plate (241), and one end of a mover of the linear motor (242) is movably connected to the outer side wall of the movable frame (233).

10. The dry concrete mixing device according to claim 9, characterized in that: The outer sides of the linear motor (242) and the support plate (241) are wrapped with a protective shell (243).

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