Multi-stage steady-flow material mixing system

Abstract

Provided in the present invention is a multi-stage steady-flow material mixing system, comprising a mixer, at least one material repository, a material buffer bin and a metering device. An outlet of the metering device is connected to a feeding port of the mixer. A plurality of stirrers, which are continuously mounted in the axial direction of a main shaft, are provided on the main shaft, and each stirrer comprises two transmission bevel gears, main-shaft bevel gears, two transmission cylindrical gears, two large ring gears and two hollow shafts, wherein the two hollow shafts rotate in opposite directions; and the numbers of teeth of the main-shaft bevel gears are different. The mixer is provided with a plurality of stirrers, which rotate in opposite directions, such that the mixing efficiency is improved, and the ineffective material mixing power consumption is reduced. By means of providing different numbers of bevel gears for the differential-speed stirrers on the main shaft, gradient stirring is performed during a material mixing process along a material mixing shaft, thereby improving the material mixing efficiency and uniformity, and facilitating the scaling-up of the apparatus. In addition, by means of arranging the material buffer bin and the metering device before feeding, the feeding stability can be effectively controlled, and the metering precision is improved, and thus the mixing uniformity is also improved.

Description

A multi-stage steady flow mixing system Technical Field

[0001] The present invention relates to the technical field of material mixing, and more particularly to a multi-stage steady-flow material mixing system. Background Art

[0002] In the cement industry, different types of materials are metered and fed into a mixing device in a specific proportion. They are then mixed mechanically or pneumatically, and then stirred evenly for a certain period of time to achieve uniform mixing. Currently, mixing devices on the market can be roughly divided into two categories: continuous and intermittent. Intermittent mixing devices, due to their static feeding and long mixing time, offer excellent mixing results and uniformity, reaching over 99%. Compared to pneumatic and mechanical composite mixing devices, the uniformity is approximately 5% higher. However, because intermittent mixing devices require several relatively large mixing tanks for mixing and require a long mixing time, they occupy a large area, limit production capacity, and cannot be widely promoted and applied.

[0003] Regarding pneumatic, mechanical, or pneumatic-mechanical combined mixing devices, the majority of powder material mixing equipment currently widely used on the market are horizontal mixers or spiral vertical mixers. The operating principle of a horizontal mixer is to mechanically agitate powdered materials using blades mounted on a drive shaft, based on fixed circular and axial motion of the material to achieve mixing. Existing horizontal mixers generally operate at a single speed within the mixing chamber, failing to achieve multiple stages of material mixing within the same mixing chamber. This results in low mixing efficiency and poor mixing results. Furthermore, sufficient power is required to overcome material resistance during operation, leading to high installed power, high energy consumption, low production efficiency, large floor space requirements, and limited process layout flexibility. Feeding materials into the mixer can easily cause "stirring," resulting in significant fluctuations in mixing uniformity and uneven material composition. This impacts subsequent process design and the improvement of finished cement product performance, leading to increasing cement production costs and hindering further energy conservation and consumption reduction efforts in the cement industry.

[0004] For materials with similar powder particle sizes, segregation is less likely to occur during mixing, ensuring smooth and uniform mixing. However, for materials with significantly different powder particle sizes, the smaller the particle size and the finer the powder, the more likely it is to float during mixing. Conversely, the larger the particle size and the coarser the powder, the more likely it is to sink during mixing. This segregation phenomenon creates difficulties in mixing. Existing equipment is prone to problems such as dead corners, dead spots, agglomeration, and balling during mixing, leading to material segregation and severe agglomeration after mixing, resulting in large fluctuations in composition and large CaO standard deviations.

[0005] When mixing ultrafine materials with a size of 1000 or 2000 mesh or larger, the gravitational constraints on individual particles are minimal due to their inherent fineness, resulting in a certain degree of floating motion. Furthermore, during the crushing process, the materials absorb a significant amount of mechanical or thermal energy, resulting in a very high surface energy for the newly formed ultrafine particles, making the material extremely unstable. To reduce this surface energy, particles often aggregate and converge to achieve stability, which can also easily cause particle agglomeration. Consequently, the particles easily agglomerate and become difficult to mix, making uniform mixing difficult.

[0006] For sticky materials, when the relative humidity of the air exceeds 65%, water vapor begins to condense on the surface of the particles and between the particles, and the agglomeration effect is greatly enhanced due to the formation of liquid bridges between the particles.

[0007] Continuous and stable material discharge from material storage, precise metering, stable material transport, and uniform mixing are key factors influencing mixing performance. The performance of a mixer can be reflected in mixing quality, power consumption, and maintenance. The primary goal of mixing is to achieve a mixture with a uniform distribution of components. The function of a mixer is to achieve a uniform blend of materials; the more uniform the output components, the better the mixing effect. In industrial applications, the feed amounts of the various materials being mixed may fluctuate, resulting in fluctuations in the output components of the mixer at different times. Therefore, a rationally designed, precise metering, and efficient mixing process system is urgently needed.

[0008] Summary of the Invention

[0009] In view of the above problems, the present invention provides a multi-stage steady-flow mixing system to solve the problems of unstable material feeding, poor uniformity, uneven mixing, and low mixing efficiency of single-speed stirring in the prior art.

[0010] The present invention provides a multi-stage steady-flow mixing system, comprising a mixer and at least one material storage; each of the material storages corresponds to a material buffer bin and a metering device, the material storage, the material buffer bin, and the metering device are sequentially connected along the material conveying direction, and the outlet of the metering device is connected to the feed inlet of the mixer; each of the material storages stores a single material;

[0011] The mixer includes a box, a feeding device, and a discharge port. The box is inclined upward from the discharge port side to the feeding device side, with an inclination angle of 2 to 10 degrees. The feeding device is arranged at the upper part of the first end of the box, and the discharge port is arranged on the side of the second end of the box.

[0012] The metering device is connected to the feeding device through a feeding pipe; after being metered by the metering device, the single material enters the mixer through the feeding pipe for stirring and mixing;

[0013] A first stirring mechanism is provided in the box body and parallel to the box body, wherein the first stirring mechanism comprises a main shaft driven by a main shaft driving device, and a plurality of stirrers are provided on the main shaft and are continuously installed along the axial direction of the main shaft;

[0014] Each of the agitators comprises two transmission bevel gears and a main shaft bevel gear coaxial with the main shaft, two transmission scallops, two large gear rings and two hollow shafts;

[0015] Two transmission bevel teeth are symmetrically arranged on both sides of the main shaft and are simultaneously engaged with the main shaft bevel teeth sleeved and fixed on the main shaft; two transmission scallops are respectively arranged on the outside of their respective corresponding transmission bevel teeth and are respectively connected to the two transmission bevel teeth through transmission gear shafts; two large gear rings are supported by a gear ring support tube, the two transmission scallops are located between the two large gear rings, and each transmission scallop is respectively engaged with the two large gear rings; the axial direction of the gear ring support tube is parallel to the main shaft, and the two ends are respectively fixed to the first end side surface and the second end side surface of the mixer;

[0016] Each hollow shaft is fixedly connected to a large gear ring, and the two hollow shafts are tightly matched at the docking position to prevent the material from entering the agitator; each hollow shaft is provided with a plurality of first blades, and under the rotation of the main shaft, the two hollow shafts rotate in opposite directions to stir and mix the material in the box;

[0017] The number of teeth of the main shaft bevel teeth of each agitator on the main shaft is different, so that the first stirring mechanism stirs the materials at different positions in the box at different speeds.

[0018] Optionally, the entire cross-section of the first blade has a uniform thickness;

[0019] The first blade is a wave-shaped structure, which is used to make the material move at variable speeds in multiple directions.

[0020] Optionally, the first blade includes a blade root and a blade tip;

[0021] The blade tip is located at the top of the first blade, the blade root is connected to the outer surface of the hollow shaft, and the blade tip faces the discharge port.

[0022] Optionally, the bottom and sides of the box are further provided with jet devices for adjusting the running trajectory and residence time of the material in the box.

[0023] Optionally, the jet device is connected to an air mixing box, which is connected to an air supply fan; the air supply fan is used to provide air pressure to the air mixing box; the air mixing box is used to provide air pressure to the jet device;

[0024] The air injection device includes a plurality of air inlet pipes; the air inlet pipes include an air inlet pipe housing, a dustproof ring, a dustproof blade, and a flap valve;

[0025] The air outlet port of the air inlet pipe faces the interior of the box; a dustproof ring and a plurality of dustproof blades located at the center of the dustproof ring and connected to the same turning axis are provided on the inner surface of the top of the air outlet port; the dustproof blades are semicircular and have the same diameter as the inner diameter of the dustproof ring. Under the action of air pressure, the dustproof blades can be turned up and down;

[0026] The air inlet port of the air inlet pipe is connected to the air mixing box, and a flap valve is provided at the port where the air inlet port is connected to the air mixing box, and the flap valve is connected to a flap valve controller; the flap valve controller controls the amount of air entering the air inlet pipe by controlling the flipping degree of the flap valve.

[0027] Optionally, the feeding device includes a feeding port and an air-locking structure installed in the feeding port;

[0028] The wind-locking structure comprises a wind-locking housing, a wind-locking driving device, a wind-locking rotating shaft and a wind-locking blade;

[0029] The wind-locking shaft is horizontally fixed in the feed port and is driven to rotate by the wind-locking driving device. A plurality of wind-locking blades are installed on the axial circumference of the wind-locking shaft; one end face of the wind-locking blade is connected to the wind-locking shaft, and the other end faces are respectively fitted with the wind-locking outer shell; when feeding, the wind-locking shaft drives the wind-locking blades to rotate and send the material into the box.

[0030] Optionally, the feeding device includes a screw feeding mechanism;

[0031] The spiral feeding mechanism includes a spiral feeding mechanism shell, a spiral feeding mechanism feed port is obliquely fixed on the spiral feeding mechanism shell and communicated with the spiral feeding mechanism shell, and the bottom of the spiral feeding mechanism shell is connected to the interior of the box;

[0032] A spiral feeding mechanism rotating shaft and spiral blades spirally distributed on the spiral feeding mechanism rotating shaft are vertically arranged in the spiral feeding mechanism shell; a grid plate is fixedly arranged at the bottom of the spiral feeding mechanism rotating shaft, and the grid plate includes a plurality of L-shaped bars, and the L-shaped bars include vertical edges and inclined edges, and the vertical edges are located above the inclined edges; one end of the inclined edge is connected to the spiral feeding mechanism rotating shaft, and the other end is connected to the bottom end of the vertical edge.

[0033] Optionally, there are four first stirring mechanisms in the box body, and the four first stirring mechanisms are divided into two layers, with two arranged on each layer.

[0034] Optionally, a plurality of groups of material blocking units are distributed in the box along the main axis direction, and the material blocking units divide the internal space of the box into a plurality of mixing chambers;

[0035] The baffle unit includes two layers of baffles, the upper and lower layers of baffles are located on the same vertical plane; the baffles include a fixed baffle located at the bottom and a movable baffle located at the top, which are used to control the amount of material in the mixing chamber entering the adjacent mixing chamber.

[0036] Optionally, the volume of the box is determined according to the feeding amount, bulk density and number of cycles of the material, and the calculation formula is as follows:

[0037] In formula (1), V is the volume of the box, in m 3 , P is the feed rate of the material, the unit is t / h, ρ0 is the bulk density of the mixed material, the unit is kg / m 3 , k number of cycles.

[0038] Optionally, a material guide plate is provided on the top of each mixing chamber, and the vertical height of the material guide plate is complementary to the vertical distance from the top of the corresponding material blocking unit to the top surface of the box body. The material guide plate is used to further control the residence time of the material in the mixing chamber.

[0039] Optionally, at least one vertical stirring mechanism is provided on the top of each mixing chamber, and the rotation speed of the vertical stirring mechanism can be adjusted according to the mixing conditions of the mixing chamber.

[0040] Optionally, the vertical stirring mechanism comprises a vertical stirring mechanism rotation shaft, a vertical stirring mechanism drive, and a plurality of second blades distributed circumferentially around the vertical stirring mechanism rotation shaft;

[0041] The second blade includes two vertical edges and is connected to the vertical stirring mechanism rotating shaft through one vertical edge, and there is a vertical curved surface between the two vertical edges; the vertical stirring mechanism drive is arranged outside the top surface of the box body and is connected to the top end of the vertical stirring mechanism rotating shaft, and the vertical stirring mechanism drive drives the vertical stirring mechanism rotating shaft to rotate, so that the second blade rotates in the horizontal direction.

[0042] Optionally, two protrusions are provided on the top of the fixed baffle at the bottom, and the two spindles pass through the fixed baffle; a groove having a shape complementary to the protrusion is provided on the bottom of the movable baffle at the top, and the width of the groove is greater than the diameter of the spindle;

[0043] The movable baffle at the upper layer is connected to the box top plate through an upper screw rod, and the movable baffle at the lower layer is connected to the box top plate through a lower screw rod. The upper and lower screw rods drive the corresponding movable baffles to move vertically up and down.

[0044] Optionally, the bottom surface of the mixing chamber is evenly divided into four regions in a grid pattern; for the maximum blowing time interval Δt between two adjacent regions of the jet device in the bottom regions of the mixing chamber, the calculation formula is as follows:

[0045] In formula (2), h is the height of the baffle unit between this mixing chamber and the next mixing chamber along the material conveying direction, g is the acceleration due to gravity, with a value of 9.8 m / s 2 .

[0046] Optionally, the minimum blowing force of the jet device is greater than the weight of the material with the heaviest weight in the mixed material.

[0047] Optionally, the multi-stage steady-flow mixing system further includes a uniformity detection system; the uniformity detection system is arranged on the discharge pipeline and is used to detect the uniformity of the material discharged from the mixer; the uniformity detection system is electrically connected to the mixer controller; the uniformity detection system is used to detect the composition uniformity of the mixed material and feedback the measured uniformity data to the mixer controller; the mixing controller is used to control the air volume of the jet device and the rotation speed of the main shaft according to the uniformity data.

[0048] Optionally, the multi-stage steady-flow mixing system further includes a product storage warehouse and a hoist; the mixed material enters the hoist from the mixer, and the hoist is used to convey the mixed material discharged from the discharge port to the product storage warehouse for storage.

[0049] The present invention has at least the following beneficial effects:

[0050] In the mixer of the multi-stage steady-flow mixing system of the present invention, by setting multiple segments of stirrers with opposite rotation directions, not only can the relative disturbance of the mixed material in the opposite directions be realized, but also the residence time of the mixed material in this area can be prolonged, the mixing efficiency of the mixed material can be improved, and the consumption of ineffective mixing power can be reduced. By setting different numbers of umbrella teeth on the differential stirrers on the main shaft and performing gradient stirring on the material mixing process along the mixing axis, while improving the mixing efficiency and uniformity, the energy consumption is reduced, the production efficiency is improved, and it is beneficial to the large-scale of the equipment. In addition, by setting a material buffer bin and a metering device before feeding, unstable feeding can be prevented, the feeding stability can be effectively controlled, and the metering accuracy can be improved. Description of the Drawings

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] FIG1 is a schematic diagram of a multi-stage steady flow mixing system provided by an embodiment of the present invention;

[0053] FIG2 is a schematic diagram of the appearance of a mixer provided in an embodiment of the present invention;

[0054] FIG3 is a schematic diagram of the internal structure of a mixer provided in an embodiment of the present invention;

[0055] FIG4 is a schematic diagram of the internal structure of an agitator provided in an embodiment of the present invention;

[0056] FIG5 is a schematic diagram of the internal structure of an agitator provided in an embodiment of the present invention;

[0057] FIG6 is a schematic diagram of the internal structure of a mixer provided in an embodiment of the present invention;

[0058] FIG7 is a schematic diagram of the structure of an air intake pipe according to an embodiment of the present invention;

[0059] FIG8 is a schematic structural diagram of an air locking device provided in an embodiment of the present invention;

[0060] FIG9 is a schematic diagram of a spiral feeding mechanism provided in an embodiment of the present invention;

[0061] FIG10 is a schematic diagram of a vertical stirring mechanism provided in an embodiment of the present invention;

[0062] FIG11 is a schematic diagram of a material blocking unit provided in an embodiment of the present invention.

[0063] Figure numerals: 1-box; 2-feeding device; 3-discharge port; 3-1-breathable filter cloth; 4-first stirring mechanism; 4-1 main shaft; 4-2-main shaft driving device; 4-3-agitator; 4-3-1-transmission bevel gear; 4-3-2-main shaft bevel gear; 4-3-3-transmission gear shaft; 4-3-4-gear bearing seat; 4-3-5-gear ring support cylinder; 4-3-6-large gear ring; 4-3-7-hollow shaft; 4-3-8-transmission round gear; 5-first blade; 6-air mixing box; 6-1-air supply fan; 7-air inlet pipe; 7-1-air inlet pipe housing; 7-2-dustproof ring; 7-3-dustproof blade; 7-4-flap valve; 7-5-flap valve controller; 7-6-air pressure sensor; 8-air lock housing; 9- Air-locking drive device; 10-air-locking shaft; 11-air-locking blade; 12-screw feeding mechanism; 12-1-screw feeding mechanism housing; 12-2-screw feeding mechanism feed port; 12-3-screw feeding mechanism rotating shaft; 12-4-screw blade; 12-5-grid plate; 13-blocking unit; 13-1-fixed baffle; 13-2-movable baffle; 13-3-upper screw; 13-4-lower screw; 13-5-rotor; 13-6-rotor support; 14-guide plate 14; 15-vertical stirring mechanism; 15-1-vertical stirring mechanism rotating shaft; 15-2- Vertical stirring mechanism drive; 15-3-second blade; 16-material storage; 16-1-first material storage; 16-2-second material storage; 16-3-third material storage; 16-4-fourth material storage; 17-metering device; 18-material buffer bin; 19-feed pipe; 20-discharge pipe; 21-uniformity detection system; 22-mixer controller; 23-product storage; 24-elevator. DETAILED DESCRIPTION

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0065] The present invention provides a multi-stage steady-flow mixing system, as shown in FIG1 , comprising a mixer and at least one material reservoir 16 ; each material reservoir 16 corresponds to a material buffer bin 18 and a metering device 17 , the material reservoir 16 , the material buffer bin 18 , and the metering device 17 are sequentially connected along the material conveying direction, and the outlet of the metering device 17 is connected to the feed port of the mixer; each material reservoir 16 stores a single material;

[0066] The mixer includes a box, a feeding device, and a discharge port. The box is inclined upward from the discharge port side to the feeding device side, with an inclination angle of 2 to 10 degrees. The feeding device is arranged at the upper part of the first end of the box, and the discharge port is arranged on the side of the second end of the box.

[0067] The metering device 17 is connected to the feeding device through a feeding pipe 19; after being metered by the metering device 17, the single material enters the mixer through the feeding pipe 19 for stirring and mixing;

[0068] A first stirring mechanism is provided in the box body and parallel to the box body, wherein the first stirring mechanism comprises a main shaft driven by a main shaft driving device, and a plurality of stirrers are provided on the main shaft and are continuously installed along the axial direction of the main shaft;

[0069] Each of the agitators comprises two transmission bevel gears and a main shaft bevel gear coaxial with the main shaft, two transmission scallops, two large gear rings and two hollow shafts;

[0070] Two transmission bevel teeth are symmetrically arranged on both sides of the main shaft and are simultaneously engaged with the main shaft bevel teeth sleeved and fixed on the main shaft; two transmission scallops are respectively arranged on the outside of their corresponding transmission bevel teeth and are respectively connected to the two transmission bevel teeth through transmission gear shafts; two large gear rings are supported by a gear ring support tube, the two transmission scallops are located between the two large gear rings, and each transmission scallop is respectively engaged with the two large gear rings; the gear ring support tube is axially parallel to the main shaft, and its two ends are respectively fixed to the first end side surface and the second end side surface of the mixer;

[0071] Each hollow shaft is fixedly connected to a large gear ring, and the two hollow shafts are tightly matched at the docking position to prevent the material from entering the agitator; each hollow shaft is provided with a plurality of first blades, and under the rotation of the main shaft, the two hollow shafts rotate in opposite directions to stir and mix the material in the box;

[0072] The number of teeth of the main shaft bevel teeth of each agitator on the main shaft is different, so that the first stirring mechanism stirs the materials at different positions in the box at different speeds.

[0073] Specifically, as shown in Figure 1, each material storage reservoir 16 corresponds to a material buffer bin 18 and a metering device 17. Different material storage reservoirs 16 store different types of materials, and each has a specific volume set according to the required mixing output. The material storage reservoir 16 releases a certain amount of material into the material buffer bin 18 for storage. The material buffer bin 18 is a small storage reservoir with a certain volume, smaller than that of the material storage reservoir 16. The metering device 17 is connected to the material buffer bin 18, and the material in the material buffer bin 18 is steadily discharged into the metering device 17 according to the discharge amount determined by the metering device 17. Each material is steadily fed into the feed pipe 19 connected to the feed device through the metering device 17 according to a certain amount. Then, from the feed pipe 19, it enters the feed device 2 at the top of the first end of the mixing box 1 and is fed into the mixing box 1. After being stirred, it flows out of the discharge port 3 provided on the side of the second end of the mixing box 1. Each material is independently equipped with a multi-stage steady-flow mixing system, which allows different types of materials to be mixed as needed, thus enhancing operability. In this application, the metering device is configured as a rotor scale, preferably a double-layer rotor scale, to ensure a metering accuracy within ±0.5%. The volume of the material buffer bin 18 is configured to be 2 to 5 times the maximum range of the metering scale.

[0074] As shown in Figure 2, the box body 1 is tilted upward from the side of the discharge port 3 to the side of the feeding device 2, and the tilt angle is 2 to 10 degrees, so that the material moves as a whole to the outlet side under the action of gravity, reducing the discharge resistance. In addition, the tilt angle should not be too small or too large. If it is too small, it may cause discharge difficulties, while if it is too large, the material will be mixed in the box body 1 for too short a time, and will be discharged from the discharge port 3 without being evenly mixed. An opening is provided at the top of the shell of the discharge port 3, and the opening is covered by a breathable filter cloth 3-1 to ensure smooth flow of materials in the box body 1 while preventing the materials from overflowing from the opening. The mixer box body 1 is supported by the bottom support device of the mixer. In addition, several glass observation doors are provided on the side of the box body 1 to observe the mixing condition and running trajectory of the mixed materials. In this application, the capacity of the mixer is 1.0 to 2.0 times the mixing amount.

[0075] As shown in Figures 3, 4, and 5, a first stirring mechanism 4 is provided in parallel with the housing 1 within the housing 1. The first stirring mechanism 4 includes a main shaft 4-1, the ends of which are mounted on the two end faces of the housing 1 in the longitudinal direction. Each main shaft 4-1 is independently driven by a main shaft drive device 4-2. The main shaft drive device 4-2 includes a drive motor and a coupling, wherein the drive motor is a permanent magnet motor. The permanent magnet motor in this application is a reversible motor that can rotate in both forward and reverse directions to prevent feed blockage.

[0076] The main shaft drive device 4-2 is located outside the mixing box 1 near the feeding device 2. The head end of the main shaft 4-1 is connected to the main shaft drive device 4-2, and the tail end of the main shaft 4-1 is supported by a bearing located at the other end of the mixing box 1. The bearing is fixed to the mixing box 1 via a bracket, and each main shaft 4-1 is provided with multiple agitators 4-3 installed in a row along the axis of the main shaft 4-1. The two transmission bevel gears 4-3-1 in the agitator 4-3 are symmetrically arranged on both sides of the main shaft 4-1 and simultaneously mesh with the main shaft bevel gears 4-3-2 sleeved and fixed to the main shaft 4-1. The main shaft bevel gears 4-3-2 are conical in shape and fixed to the main shaft 4-1. Through gear engagement, they drive the transmission bevel gears 4-3-1, which have a certain number of teeth set in the radial direction, to rotate. Two transmission scallops 4-3-8 are respectively located outside their corresponding transmission bevel gears 4-3-1 and are connected to the two transmission bevel gears 4-3-1 via the transmission gear shaft 4-3-3. The transmission scallops 4-3-8 are connected to the ring gear support tube 4-3-5 via the gear bearing seat 4-3-4. Two large ring gears 4-3-6 are supported by the ring gear support tube 4-3-5. The two transmission scallops 4-3-8 are located between the two large ring gears 4-3-6, and each transmission scallop 4-3-8 meshes with the two large ring gears 4-3-6. The ring gear support tube 4-3-5 is parallel to the main shaft 4-1, and its ends are respectively fixed to the first and second end side surfaces of the mixer. The two large ring gears 4-3-6 that mesh with the two transmission scallops 4-3-8 are fixed to the outer circumference of the ring gear support tube 4-3-5. The first and second end side surfaces are both vertical surfaces.

[0077] Each hollow shaft 4-3-7 is fixedly connected to a large gear ring 4-3-6, and the two hollow shafts 4-3-7 are tightly matched at the docking position to prevent the material from entering the agitator 4-3. A plurality of first blades 5 are set on the outside of each hollow shaft 4-3-7. Under the rotation of the main shaft 4-1, the two hollow shafts 4-3-7 rotate around the main shaft 4-1 in different directions, driving the first blades 5 on the two hollow shafts 4-3-7 to rotate in different directions, stirring and mixing the material in the box body 1. The main shaft bevel teeth 4-3-2 of each agitator 4-3 on the main shaft 4-1 have different numbers of teeth. By setting different numbers of teeth on the main shaft bevel teeth 4-3-2, the transmission speed is also different when the main shaft bevel teeth 4-3-2 are used for transmission. Therefore, the first stirring mechanism 4 can stir the materials at different positions in the box body 1 at different speeds.

[0078] Each agitator 4-3 includes first blades 5 rotating in opposite directions. These blades generate more complex and intense fluid motion during the mixing process, thereby enhancing the mixing effect of the materials within the chamber 1. This ensures that the materials are fully mixed in all directions, reduces dead angles in the mixing process, and improves mixing uniformity. Furthermore, since the blades rotate in opposite directions, they can work together to form a more efficient stirring force field. This force field can accelerate the flow and mixing of the materials within the mixing drum, thereby shortening mixing time and improving production efficiency.

[0079] Multiple agitators 4-3 are mounted on the mixing spindle 4-1, each agitator 4-3 rotating in opposite directions. Within a given mixing area, this not only achieves relative agitation of the mixed materials in opposite directions, but also prolongs the residence time of the mixed materials within this area, improving the mixing efficiency of the mixed materials and reducing ineffective mixing power consumption. Furthermore, the multiple agitators 4-3 mounted consecutively on the spindle 4-1 have different stirring speeds. Using agitators 4-3 with different numbers of bevel teeth, the materials are more effectively mixed. This design of varying stirring speeds increases the contact area and contact time between the materials, promoting interaction and diffusion between the materials, thereby improving mixing efficiency. Furthermore, gradient stirring allows the materials to experience different mixing environments and conditions within the mixing chamber 1, thereby more comprehensively meeting mixing requirements. By gradually increasing the number of bevel teeth on the agitator 4-3, a transition from coarse mixing to fine mixing can be achieved, gradually achieving a uniform mixing state. This helps improve mixing quality and makes the product more stable and reliable. By gradually increasing the number of bevel teeth on the agitator 4-3, different mixing effects can be achieved at different stages, thus avoiding unnecessary energy consumption, helping to reduce production costs and improve economic benefits.

[0080] In summary, the mixer in the multi-stage steady flow mixing system of the present invention can not only realize the relative disturbance of the mixed material in opposite directions by setting multiple sections of agitators with opposite rotation directions, but also prolong the residence time of the mixed material in this area, improve the mixing efficiency of the mixed material, and reduce the ineffective mixing power consumption. By setting different numbers of bevel teeth on the speed difference agitator on the main shaft, gradient stirring is performed along the mixing axis during the material mixing process, which improves the mixing efficiency and uniformity while reducing energy consumption, improving production efficiency, and facilitating the large-scale equipment. In addition, by setting a material buffer bin and a metering device before feeding, unstable material discharge can be prevented, the feeding stability can be effectively controlled, and the metering accuracy can be improved.

[0081] In a possible embodiment, the entire cross-section of the first blade has a uniform thickness;

[0082] The first blade is a wave-shaped structure, which is used to make the material move at variable speeds in multiple directions.

[0083] Specifically, the first blade 5 has a uniform overall thickness and a wavy structure. When multiple wavy blades are installed on the stirring shaft and the blades rotate with the main shaft 4-1, eddies and shear forces are generated, causing the material to move at variable speeds in multiple directions. When the wavy blades rotate, the area and direction of contact with the material continuously change. This constantly changing contact generates a shear force, which pushes and mixes the material in a direction perpendicular to the axis of rotation. In addition, as the blades rotate, the material is subjected to centrifugal force, causing the material to be pushed outward. The combined action of the movement caused by this centrifugal force and the shear force causes the material to move at variable speeds in multiple directions. In addition, when the blades rotate, the material circulates under the push of the blades, forming eddies. These eddies generate vortices and mixing inside the material, which helps to evenly mix and disperse the material.

[0084] In a possible embodiment, the first blade includes a blade root and a blade tip;

[0085] The blade tip is located at the top of the first blade, the blade root is connected to the outer surface of the hollow shaft, and the blade tip faces the discharge port.

[0086] Specifically, the root of the first blade 5 is connected to the outer surface of the hollow shaft 2, and the tip of the blade is facing the direction of the discharge port 3, so that the material has a tendency to flow toward the discharge port 3 during the stirring process. In the present invention, the angle between the first blade 5 and the axis of the hollow shaft 4-3-7 is 30° to 60°.

[0087] In a possible embodiment, the bottom and sides of the box are further provided with air-jet devices for adjusting the running trajectory and residence time of the material in the box.

[0088] Specifically, as shown in FIG3 , jet devices are provided at the bottom and sides of the mixer housing 1 to achieve a repeated motion path for several times during the rising and settling process of the material, so that the material can be fully mixed and stirred during this process, and the running trajectory and residence time of the material in the housing 1 are adjusted. The provision of the jet device can achieve a repeated motion path for several times during the rising and settling process of the material, so that the material can be fully mixed and stirred during this process. The jet device performs a convective impact and dispersion on the material in the housing 1, especially causing finer materials to be subjected to forces from different directions in the motion space, so that the material can be fully stirred and mixed. At the same time, it can also prevent local sedimentation of the bottom material, improve the uniformity of the material mixing, and reduce the standard deviation of the mixing effect.

[0089] In a possible embodiment, the air jet device is connected to an air mixing box, and the air mixing box is used to provide air pressure to the air jet device;

[0090] The air injection device includes a plurality of air inlet pipes; the air inlet pipes include an air inlet pipe housing, a dustproof ring, a dustproof blade, and a flap valve;

[0091] The air outlet port of the air inlet pipe faces the interior of the box; a dustproof ring and a plurality of dustproof blades located at the center of the dustproof ring and connected to the same turning axis are provided on the inner surface of the top of the air outlet port; the dustproof blades are semicircular and have the same diameter as the inner diameter of the dustproof ring. Under the action of air pressure, the dustproof blades can be turned up and down;

[0092] The air inlet port of the air inlet pipe is connected to the air mixing box, and a flap valve is provided at the port where the air inlet port is connected to the air mixing box, and the flap valve is connected to a flap valve controller; the flap valve controller controls the amount of air entering the air inlet pipe by controlling the flipping degree of the flap valve.

[0093] Specifically, as shown in Figures 6 and 7, the jet device is connected to the air mixing box 6, which is connected to the air supply fan 6-1. The air supply fan 6-1 is used to provide compressed air to the air mixing box 6, and the air mixing box 6 provides the compressed air provided by the air supply fan to the jet device. The jet device includes several air inlet pipes 7, which include an air inlet pipe shell 7-1, a dustproof ring 7-2, a dustproof blade 7-3, and a flap valve 7-4. The air outlet port of the air inlet pipe 7 faces the interior of the box body 1. A dustproof ring 7-2 is provided on the inner surface of the top of the air outlet port. The center of the dustproof ring 7-2 is also provided with multiple dustproof blades 7-3 connected to the same flip axis. The dustproof blades 7-3 are semicircular and have the same diameter as the inner diameter of the dustproof ring 7-2. Under the action of air pressure, the dustproof blades 7-3 can flip up and down.

[0094] The air inlet port of the air inlet duct 7 is connected to the air mixing box 6, and a flap valve 7-4 is installed at the port where the air inlet port connects to the air mixing box 6. The flap valve 7-4 is electrically connected to the flap valve controller 7-5. The air inlet duct 7 is also equipped with an air pressure sensor 7-6, which is electrically connected to the flap valve controller 7-5 and feeds the detected air volume in the air inlet duct 7 back to the flap valve controller 7-5. The flap valve controller 7-5 controls the degree of flipping of the flap valve 7-4 based on the received air volume in the air inlet duct 7 to ensure that the air volume in the air inlet duct 7 reaches the target air volume. The gas in the air mixing box 6 is ambient air, and more preferably, it can also be hot air with a certain temperature to ensure more thorough mixing of the air and material.

[0095] In a possible embodiment, the feeding device includes a feeding port and an air-locking structure installed in the feeding port;

[0096] The wind-locking structure comprises a wind-locking housing, a wind-locking driving device, a wind-locking rotating shaft and a wind-locking blade;

[0097] The wind-locking shaft is horizontally fixed in the feed port and is driven to rotate by the wind-locking driving device. A plurality of wind-locking blades are installed on the axial circumference of the wind-locking shaft; one end face of the wind-locking blade is connected to the wind-locking shaft, and the other end faces are respectively fitted with the wind-locking outer shell; when feeding, the wind-locking shaft drives the wind-locking blades to rotate and send the material into the box.

[0098] Specifically, as shown in Figure 6, the feeding device 2 is located at the upper side of the box body 1, and an air locking device is provided in the feeding port of the feeding device 2. As shown in Figure 8, the air locking device is cylindrical, and the air locking shaft 10 in the air locking device is located in the internal space of the feeding port and is arranged horizontally. The air locking drive device 9 is arranged on the outside of the feeding port shell and is connected to the air locking shaft 10 to drive the air locking shaft 10 to rotate. The material enters the air locking cavity through the feeding port. The air locking shaft 10 is perpendicular to the main shaft 4-1, one end is connected to the air locking drive device 9, and the other end is fixed to the side of the air locking device shell; the air locking blade 11 is fixed to the axial direction of the air locking shaft 10, and one end face of the air locking blade 11 is connected to the air locking shaft 10, and the other end faces of the air locking blade 11 are in contact with the air locking shell 8, that is, the gap between the other end faces of the air locking blade 11 and the air locking shell 8 is extremely small, and can rotate freely relative to the air locking shell 8. Driven by the air locking drive device 9, the air locking shaft 10 rotates. When feeding, the air lock shaft 10 rotates to drive the air lock blade 11 to rotate and feed the material into the box body 1. At the same time, the air lock blade 11 also prevents external air from entering the box body 1 and affecting the air flow distribution inside the box body. The minimum distance between the air lock blade 11 and the air lock housing 8 is 5 to 10 mm.

[0099] In a possible embodiment, the feeding device includes a screw feeding mechanism;

[0100] The spiral feeding mechanism includes a spiral feeding mechanism shell, the feed port is obliquely fixed on the spiral feeding mechanism shell and is connected to the feed port and the spiral feeding mechanism shell, and the bottom of the spiral feeding mechanism shell is connected to the interior of the box;

[0101] A spiral feeding mechanism rotating shaft and spiral blades spirally distributed on the spiral feeding mechanism rotating shaft are vertically arranged in the spiral feeding mechanism shell; a grid plate is fixedly arranged at the bottom of the spiral feeding mechanism rotating shaft, and the grid plate includes a plurality of L-shaped bars, and the L-shaped bars include horizontal edges and vertical edges, and the vertical edges are located above the horizontal edges; one end of the horizontal edge is connected to the spiral feeding mechanism rotating shaft, and the other end is connected to the vertical edge.

[0102] Specifically, as shown in Figure 9, the feeding device 2 includes a screw feed mechanism 12. The screw feed mechanism feed port 12-2 is fixed at an angle to the screw feed mechanism housing 12-1 and communicates with the housing of the screw feed mechanism 12. The counterclockwise angle between the screw feed mechanism feed port 12-2 and the horizontal plane is 45 to 80 degrees. The bottom of the screw feed mechanism housing 12-1 is embedded in the interior space of the housing 1 and communicates with the interior of the housing 1. After being fed from the outside through the screw feed mechanism feed port 12-2, the material enters the screw feed mechanism 12 and then enters the housing 1 of the mixer from the screw feed mechanism 12.

[0103] A spiral feed mechanism rotating shaft 12-3 is vertically disposed within the spiral feed mechanism housing 12-1. Spiral blades 12-4 are fixed to the spiral feed mechanism rotating shaft 12-3. The spiral blades 12-4 are arranged in a spiral pattern around the spiral feed mechanism rotating shaft 12-3. The minimum spacing between the edge of the spiral blade 12-4 and the spiral feed mechanism housing 12-1 is 5 to 10 mm. This ensures that the spiral blade 12-4 rotates normally, effectively preventing wind from entering the box body, affecting the distribution of airflow within the box body 1 and the mixing effect. Furthermore, the material entering from the feed port can be guided along its path. A grating plate 12-5 is fixedly mounted at the bottom of the screw feed mechanism's rotating shaft 12-3. The grating plate 12-5 comprises a plurality of L-shaped bars, each comprising an inclined edge and a vertical edge, with the vertical edge positioned above the inclined edge. One end of the inclined edge is connected to the screw feed mechanism's rotating shaft 12-3, while the other end is connected to the bottom end of the vertical edge. All of the inclined and vertical edges form a cylindrical shape, and the diameter of the cylindrical shape is larger than the outer casing of the screw feed mechanism 12, ensuring that all material entering the housing 1 from the screw mechanism passes through the grating plate 12-5. The screw feed mechanism's rotating shaft 12-3 is connected to a drive motor. Driven by the drive motor, the screw feed mechanism's rotating shaft 12-3 rotates, driving the spiral blades 12-4 and the grating. During rotation, the grating breaks up the material guided down along the spiral blades 12-4.

[0104] In a possible implementation, there are four first stirring mechanisms in the box, and the four first stirring mechanisms are divided into two layers, with two first stirring mechanisms provided in each layer.

[0105] Specifically, as shown in Figure 6, four mutually parallel first stirring mechanisms 4 are provided in the box body 1, which are divided into two layers, two on each layer, to stir materials at different heights in the box body 1. In other embodiments, other numbers of first stirring mechanisms 4 can be provided according to actual mixing requirements. In other embodiments, the two shafts in the upper layer are main shafts 4-1, and the lower layer is provided with two secondary shafts. The diameters of the two main shafts 4-1 are larger than the two secondary shafts, and the corresponding multi-stage speed difference agitators 4-3 and vortex disturbance type stirring blades are also larger than the secondary shafts. The diameter of the main shaft 4-1 is 2 to 5 times the diameter of the secondary shaft.

[0106] In a possible embodiment, a plurality of groups of material blocking units are distributed in the box along the main axis direction, and the material blocking units divide the internal space of the box into a plurality of mixing chambers;

[0107] The baffle unit includes two layers of baffles, the upper and lower layers of baffles are located on the same vertical plane; the baffles include a fixed baffle located at the bottom and a movable baffle located at the top, which are used to control the amount of material in the mixing chamber entering the adjacent mixing chamber.

[0108] Specifically, as shown in Figure 6, the interior of the box body 1 is provided with a plurality of groups of baffle units 13, and the plurality of groups of baffle units 13 divide the interior of the box body 1 into a plurality of spaces, each of which is regarded as a mixing chamber. The baffle unit 13 is composed of two layers of baffles, the upper and lower layers, and the two layers of baffles are located on the same vertical plane. Each layer of baffles is composed of a fixed baffle 13-1 and a movable baffle 13-2. By adjusting the position of the movable baffle 13-2, the mixing volume and the mixing residence time of each mixing chamber can be controlled. The baffle unit 13 is made of wear-resistant material. In this embodiment, the base material is cast steel ZG20SiMn, and the wear-resistant layer is a surfacing material. In addition, the top height of each baffle unit can also be set to a louver form, that is, a panel with multiple slits. The material can only pass through the slits, which can prevent the material from overflowing too quickly and reduce the mixing residence time of the material.

[0109] In a possible implementation, the volume of the box is determined according to the feed amount, bulk density and number of cycles of the material, and the calculation formula is as follows:

[0110] In formula (1), V is the volume of the box, in m 3 , P is the feed rate of the material, the unit is t / h, ρ0 is the bulk density of the mixed material, the unit is kg / m 3 , k number of cycles.

[0111] Specifically, for materials with specific mixing ratios over a long period of time, the volume of chamber 1 can be set based on the bulk density of the mixed material, the hourly feed weight, and the number of times the material is circulated and stirred in chamber 1. A reasonable design of the volume of chamber 1 can reduce unnecessary space occupation and additional costs while ensuring uniform mixing. The number of cycles k is adjusted based on the required precision of the mixed product. Preferably, the number of cycles k is 1 to 5, and the aspect ratio of chamber 1 is set to 2 to 10.

[0112] In one possible embodiment, a material guide plate is provided on the top of each mixing chamber, and the vertical height of the material guide plate is complementary to the vertical distance from the top of the corresponding material blocking unit to the top surface of the box body, and the material guide plate is used to further control the residence time of the material in the mixing chamber.

[0113] Specifically, as shown in Figure 3, the material blocking unit 13 divides the interior of the housing 1 into multiple mixing chambers. A guide plate 14 is provided at the top of each mixing chamber. The vertical distance between the top of each guide plate 14 and the top surface of the housing 1 complements the vertical distance between the top of the corresponding material blocking unit 13 and the top surface of the housing 1. The corresponding material blocking unit 13 is the downstream material blocking unit 13 in the material incoming direction. The vertical height of the guide plate 14 closest to the discharge port 3 complements the vertical height of the material blocking unit 13 upstream in the material incoming direction. The provision of the guide plates 14 further controls the time when materials enter the downstream mixing chamber from the current mixing chamber, increases the residence time of the materials in the mixing chamber, and ensures that the materials entering the housing 1 are fully mixed before flowing out of the discharge port 3. In addition, in other embodiments, when there is no material blocking unit 13 or no air injection device is provided at the bottom and side of the box body, a plurality of material separation bars are provided on the inner wall of the box body 1 along the stirring direction of the main shaft 4-1. The position of the material separation bars within the box body 1 is opposite to the projection position of the connection between each two agitators 4-3 on the side wall of the box body 1. The side of the material separation bar facing the feeding device 2 is an inclined surface, and the side of the material separation bar facing the discharge port 3 is a vertical surface. The vertical surface is used to prevent material from flowing back toward the feeding device 2.

[0114] In a possible embodiment, at least one vertical stirring mechanism is provided on the top of each mixing chamber, and the rotation speed of the vertical stirring mechanism can be adjusted according to the mixing conditions of each mixing chamber.

[0115] Specifically, as shown in FIG6 , in the mixing chamber formed by each material blocking unit 13 , the upper and lower layers include at least four agitators 4 - 3 , and the four agitators 4 - 3 belong to different first stirring mechanisms 4 .

[0116] A vertical stirring mechanism 15 is provided on the top of the mixing chamber to further achieve gradient stirring of the materials in the mixing chamber in the vertical direction. The stirring speed of the corresponding vertical stirring mechanism 15 in each mixing chamber can be adjusted according to the actual mixing situation.

[0117] In one possible embodiment, the vertical stirring mechanism includes a vertical stirring mechanism rotating shaft, a vertical stirring mechanism drive, and a plurality of second blades distributed circumferentially around the vertical stirring mechanism rotating shaft;

[0118] The second blade includes two vertical edges and is connected to the vertical stirring mechanism rotating shaft through one vertical edge, and there is a vertical curved surface between the two vertical edges; the vertical stirring mechanism drive is arranged outside the top surface of the box body and is connected to the top end of the vertical stirring mechanism rotating shaft, and the vertical stirring mechanism drive drives the vertical stirring mechanism rotating shaft to rotate, so that the second blade rotates in the horizontal direction.

[0119] Specifically, as shown in FIG10 , the vertical stirring mechanism 15 includes a vertically disposed rotating shaft 15-1, and a plurality of second blades 15-3 are disposed circumferentially thereon. The second blades 15-3 are vertically disposed curved surfaces, one vertical edge of which is connected to the vertical stirring mechanism rotating shaft 15-1. A vertical stirring mechanism drive 15-2 is disposed externally on the top surface of the housing 1 and connected to the top of the vertical stirring mechanism rotating shaft 15-1. Under the action of the vertical stirring mechanism drive 15-2, the vertical stirring mechanism rotating shaft 15-1 drives the second blades 15-3 to rotate, thereby performing horizontal rotational stirring on the material located at the top of the housing 1.

[0120] In a possible embodiment, two protrusions are provided on the top of the fixed baffle at the bottom, and the two spindles pass through the fixed baffle; a groove having a shape complementary to the protrusion is provided at the bottom of the movable baffle at the top, and the width of the groove is greater than the diameter of the spindle;

[0121] The movable baffle at the upper layer is connected to the box top plate through an upper screw rod, and the movable baffle at the lower layer is connected to the box top plate through a lower screw rod. The upper and lower screw rods drive the corresponding movable baffles to move vertically up and down.

[0122] Specifically, as shown in Figures 6 and 11, the material baffle unit 13 includes two layers of baffles, each layer of which includes a movable baffle 13-2 located at the top and a fixed baffle 13-1 located at the bottom. The two main shafts 4-1 pass through the fixed baffles 13-1, and two protrusions are provided on the top of the fixed baffles 13-1. The side surfaces of the upper and lower fixed baffles 13-1 are in close contact with the inner wall of the box body 1, and the bottom end surface of the lower fixed baffle 13-1 is in close contact with the bottom surface of the box body 1, preventing the material from passing through the gap between the lower fixed baffle 13-1 and the bottom of the box body 1 without being sufficiently mixed. The bottom of the movable baffle 13-2, corresponding to the fixed baffle 13-1, is provided with a groove. The shape of the groove complements the protrusion on the corresponding fixed baffle 13-1. The width of the groove is greater than the diameter of the main shaft 4-1. The movable baffle 13-2 can be moved to a position that is closely aligned with the corresponding fixed baffle 13-1. The two grooves of the movable baffle 13-2 are respectively stuck on the two main shafts 4-1. At this time, the ability to prevent material from entering the mixing chamber from entering the other mixing chamber is minimized. When the groove of the movable baffle 13-2 fully matches the protrusion of the corresponding movable baffle 13-2, the ability to prevent material from entering the mixing chamber is maximized, extending the time the material stays in the mixing chamber. In this application, the total height of each material retaining baffle is less than the height of the mixer housing 1.

[0123] In the material baffle unit 13, the movement of the upper movable baffle 13-2 is realized by the upper screw 13-3 installed on the top plate of the box body 1, and the movement of the lower movable baffle 13-2 is realized by the lower screw 13-4 installed on the top plate of the box body 1. The tops of the upper and lower screws 13-4 respectively pass through the corresponding rotating wheels 13-5 outside the top of the box body 1. A rotating wheel support 13-6 is arranged between the rotating wheel 13-5 and the outer surface of the top of the box body 1 to support the rotating wheel 13-5. The rotation of the rotating wheel 13-5 drives the corresponding screw to move vertically upward or vertically downward, and the screw drives the corresponding movable baffle 13-2 to move vertically up and down, so as to realize the regulation of the residence time of the material in the mixing chamber.

[0124] In a possible implementation manner, the bottom surface of the mixing chamber is evenly divided into four regions in a cross shape; for the maximum blowing time interval △t between two adjacent regions among the four regions at the bottom of the mixing chamber by the air jet device, the calculation formula is as follows:

[0125] In formula (2), h is the height of the material baffle unit between this mixing chamber and the next mixing chamber along the material conveying direction, and g is the acceleration due to gravity, with a value of 9.8 m / s 2 .

[0126] Specifically, the bottom surface of each mixing chamber is evenly divided into four equal regions in a cross shape. An intermittent blowing time △t is set between two adjacent regions among the four regions. Among the four regions on the bottom surface, at the same time, the pressures received by the material passing through each region at the bottom of the mixing chamber are different, so that the falling speeds from the top are also different. In this process, the probability of mixing can also be increased and the mixing effect can be enhanced. In addition, the air blowing volume can be reduced under the same mixing effect. In formula (2), h is the height of the material baffle unit between this mixing chamber and the next mixing chamber along the material conveying direction. The height of the material baffle unit of the mixing chamber closest to the discharge port is based on the height of the material baffle unit between the mixing chamber adjacent to this mixing chamber.

[0127] In a possible implementation manner, the minimum blowing force of the mixer is greater than the weight of the material with the heaviest weight in the mixed materials.

[0128] Specifically, the minimum blowing force of the mixer is greater than the weight of the material with the heaviest weight in the mixed materials to ensure that each material can be blown up and no mixing dead angle is formed at the bottom of the mixing chamber, further promoting the mixing of the materials.

[0129] In one possible embodiment, the multi-stage steady-flow mixing system also includes a uniformity detection system; the uniformity detection system is arranged on the discharge pipe, and is used to detect the uniformity of the material discharged from the mixer; the uniformity detection system is electrically connected to the mixer controller; the uniformity detection system is used to detect the uniformity of the composition of the mixed material, and feed back the measured uniformity data to the mixer controller; the mixing controller is used to control the air volume of the jet device and the speed of the main shaft according to the uniformity data.

[0130] Specifically, as shown in FIG1 , a uniformity detection system 21 is provided on the discharge pipe 20 connected to the mixer discharge port to detect the uniformity of the material discharged from the discharge port. The uniformity data after detection is transmitted to the mixer controller 22. In the present application, by real-time monitoring of CaO in the material discharged from the mixer, relevant information is promptly fed back to the mixer controller 22. The mixer controller 22 adjusts and controls the air volume in the jet device and the speed of the main shaft according to the uniformity data, thereby ensuring the uniformity of the material mixing in the mixer and making the finished product composition fluctuate within a certain range.

[0131] In a possible embodiment, the multi-stage steady flow mixing system further includes a product storage and an elevator; the mixed material enters the elevator from the mixer, and the elevator is used to transport the mixed material discharged from the discharge port to the product storage for storage.

[0132] Specifically, as shown in FIG1 , the mixed material discharged from the discharge port is transported to the hopper of the elevator 24 through the discharge pipe 20 , and the elevator 24 lifts the hopper and pours the material into the product storage 23 for storage.

[0133] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0134] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A multi-stage steady-flow mixing system, characterized in that, It includes a mixer and at least one material storage bin; each of the material storage bins corresponds to a material buffer bin and a metering device, and the material storage bin, the material buffer bin, and the metering device are connected in sequence along the material conveying direction, and the outlet of the metering device is connected to the inlet of the mixer; a single material is stored in each of the material storage bins; The mixer includes a box body, a feeding device, and an outlet. The box body is inclined upward from the side of the outlet to the side of the feeding device, and the inclination angle is 2-10°. The feeding device is arranged at the upper part of the first end of the box body, and the outlet is arranged on the side surface of the second end of the box body; The metering device is connected to the feeding device through a feeding pipeline; after being metered by the metering device, the single material enters the mixer through the feeding pipeline for stirring and mixing; A first stirring mechanism is arranged in the box body parallel to the box body. The first stirring mechanism includes a main shaft driven by a main shaft driving device, and a plurality of stirrers are continuously installed on the main shaft along the axial direction of the main shaft; Each stirrer includes two driving bevel gears, a main shaft bevel gear coaxial with the main shaft, two driving circular gears, two large gear rings, and two hollow shafts; The two driving bevel gears are symmetrically arranged on both sides of the main shaft and are simultaneously meshed with the main shaft bevel gear sleeved and fixed on the main shaft; the two driving circular gears are respectively arranged on the outer sides of their corresponding driving bevel gears and are respectively connected to the two driving bevel gears through driving gear shafts; the two large gear rings are supported by gear ring support cylinders. The two driving circular gears are located between the two large gear rings, and each driving circular gear is respectively meshed with the two large gear rings; the axial direction of the gear ring support cylinder is parallel to the main shaft, and both ends are respectively fixed to the side surfaces of the first end and the second end of the mixer; Each hollow shaft is respectively fixedly connected to a large gear ring, and the docking positions of the two hollow shafts are in close fit to prevent materials from entering the stirrer; a plurality of first blades are arranged on each hollow shaft. Under the rotation of the main shaft, the two hollow shafts rotate in opposite directions to stir and mix the materials in the box body; The number of teeth of the main shaft bevel gears of the stirrers on the main shaft is different, so that the first stirring mechanism stirs the materials at different positions in the box body at different speeds.

2. The multi-stage steady-flow mixing system according to claim 1, wherein The overall cross-sectional thickness of the first blade is consistent; The first blade is of a wavy structure and is used to make the materials move at variable speeds in multiple dimensions.

3. The multi-stage steady-flow mixing system according to claim 2, characterized in that, The first blade includes a blade root and a blade tip; The blade tip is located at the top of the first blade. The blade root is connected to the outer surface of the hollow shaft, and the blade tip faces the outlet; 4. The multi-stage steady-flow mixing system according to claim 1, wherein, An air jet device is also arranged at the bottom and side of the box body for adjusting the running track and residence time of the materials in the box body; 5. The multi-stage steady-flow mixing system according to claim 4, characterized in that The air jet device is connected to a mixing air box, and the mixing air box is connected to a blower; the blower is used to provide air pressure to the mixing air box; the mixing air box is used to provide air pressure to the air jet device; The air jet device includes a plurality of air inlet pipes; each air inlet pipe includes an air inlet pipe housing, a dust-proof ring, a dust-proof blade, and a flap valve; The air outlet port of the air inlet pipe faces the interior of the box body; a dust-proof ring is provided on the inner surface of the top of the air outlet port, and a plurality of dust-proof blades connected to the same turning shaft and located at the center of the dust-proof ring are provided. The dust-proof blades are semi-circular, and the diameter is the same as the inner diameter of the dust-proof ring. Under the action of air pressure, the dust-proof blades can be turned up and down. The air inlet port of the air inlet pipe is connected to the air mixing box, and a flap valve is provided at the port where the air inlet port is connected to the air mixing box. The flap valve is connected to a flap valve controller; the flap valve controller controls the turning degree of the flap valve to control the air volume entering the air inlet pipe.

6. The multi-stage steady-flow mixing system according to claim 1, wherein, The feeding device includes a feeding port and a wind locking structure installed in the feeding port. The wind locking structure includes a wind locking housing, a wind locking driving device, a wind locking rotating shaft and wind locking blades. The wind locking rotating shaft is horizontally fixed in the feeding port and is driven to rotate by the wind locking driving device. A plurality of the wind locking blades are axially and circumferentially installed on the wind locking rotating shaft; one end face of the wind locking blade is connected to the wind locking rotating shaft, and the other end faces are respectively attached to the wind locking housing; when feeding, the wind locking rotating shaft drives the wind locking blades to rotate to send the material into the box body.

7. The multi-stage steady-flow mixing system according to claim 1, wherein, The feeding device includes a screw feeding mechanism. The screw feeding mechanism includes a screw feeding mechanism housing. The screw feeding mechanism feeding port is obliquely fixed on the screw feeding mechanism housing and is communicated with the screw feeding mechanism housing. The bottom of the screw feeding mechanism housing is communicated with the interior of the box body. A screw feeding mechanism rotating shaft is vertically arranged in the screw feeding mechanism housing, and screw blades spirally distributed and fixed on the screw feeding mechanism rotating shaft are provided. A grille plate is fixedly arranged at the bottom of the screw feeding mechanism rotating shaft. The grille plate includes a plurality of L-shaped grid bars. The L-shaped grid bars include a vertical side and an inclined side, and the vertical side is located above the inclined side; one end of the inclined side is connected to the screw feeding mechanism rotating shaft, and the other end is connected to the bottom end of the vertical side.

8. The blender according to claim 1, wherein There are four first stirring mechanisms in the box body. The four first stirring mechanisms are divided into upper and lower layers, with two arranged in each layer.

9. The multi-stage steady-flow mixing system according to claim 8, characterized in that, A plurality of sets of material blocking units are distributed along the main shaft direction in the box body. The material blocking units divide the interior space of the box body into a plurality of mixing chambers. The material blocking unit includes upper and lower layers of baffles; the upper and lower layers of baffles are located in the same vertical plane; the baffle includes a fixed baffle located below and a movable baffle located above, and is used to control the amount of material in the mixing chamber entering the adjacent mixing chamber.

10. The multi-stage steady-flow mixing system according to claim 9, characterized in that, The volume of the box body is determined according to the feeding amount, bulk density and number of cycles of the material, and the calculation formula is as follows: In formula (1), V is the volume of the box body, with the unit of m 3 , P is the feeding amount of the material, with the unit of t / h, ρ0 is the bulk density of the mixed material, with the unit of kg / m 3 , and k is the number of cycles.

11. The multi-stage steady-flow mixing system according to claim 9, characterized in that, A guide plate is provided at the top of each mixing chamber. The vertical height of the guide plate is complementary to the vertical distance from the top end of the corresponding material blocking unit to the inner top surface of the box body. The guide plate is used to further control the residence time of the material in the mixing chamber.

12. The multi-stage steady-flow mixing system according to claim 9, characterized in that, At least one vertical stirring mechanism is provided at the top of each mixing chamber. The rotation speed of the vertical stirring mechanism can be adjusted according to the mixing condition of the mixing chamber.

13. The multi-stage steady-flow mixing system according to claim 12, characterized in that, The vertical stirring mechanism includes a vertical stirring mechanism rotating shaft, a vertical stirring mechanism drive, and a plurality of second blades circumferentially distributed around the vertical stirring mechanism rotating shaft. The second blade includes two vertical edges and is connected to the rotating shaft of the vertical stirring mechanism through one vertical edge. A vertical curved surface is formed between the two vertical edges. The vertical stirring mechanism is driven and arranged outside the top surface of the box body and is connected to the top end of the rotating shaft of the vertical stirring mechanism. The vertical stirring mechanism drives the rotating shaft of the vertical stirring mechanism to rotate, causing the second blade to rotate in the horizontal direction.

14. The multi-stage steady-flow mixing system according to claim 9, wherein Two protrusions are provided at the top end of the fixed baffle located below, and the two main shafts pass through the fixed baffle. Grooves complementary to the shape of the protrusions are provided at the bottom of the movable baffle above. The width of the grooves is greater than the diameter of the main shaft. The movable baffle located in the upper layer is connected to the top plate of the box body through an upper screw rod, and the movable baffle located in the lower layer is connected to the top plate of the box body through a lower screw rod. The upper and lower screw rods drive the corresponding movable baffles to move vertically up and down.

15. The multi-stage steady-flow mixing system according to claim 5, wherein The bottom surface of the mixing chamber is evenly divided into four regions in a grid pattern; for the maximum blowing time interval Δt between two adjacent regions among the bottom regions of the mixing chamber where the jetting device is located, the calculation formula is as follows: In formula (2), h is the height of the baffle unit between this mixing chamber and the next mixing chamber along the material conveying direction, g is the acceleration due to gravity, with a value of 9.8 m / s 2 .

16. The multi-stage steady-flow mixing system according to claim 5, wherein The minimum blowing force of the air jet device is greater than the weight of the heaviest material in the mixed material.

17. The multi-stage steady-flow mixing system according to claim 5, characterized in that, The multi-stage steady-flow mixing system further includes a uniformity detection system. The uniformity detection system is arranged on the discharge pipeline and is used to detect the uniformity of the material discharged from the mixer. The uniformity detection system is electrically connected to the mixer controller. The uniformity detection system is used to detect the composition uniformity of the mixed material and feedback the measured uniformity data to the mixer controller. The mixing controller is used to control the air volume of the air jet device and the rotation speed of the main shaft according to the uniformity data.

18. The multi-stage steady-flow mixing system according to claim 1, wherein, The multi-stage steady-flow mixing system further includes a product storage warehouse and a hoist. The mixed material enters the hoist from the mixer, and the hoist is used to transport the well-mixed material discharged from the discharge port to the product storage warehouse for storage.

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