Multi-powder mixing equipment based on density gradient compensation

Abstract

The invention discloses a multi-powder mixing device based on density gradient compensation, which realizes layered feeding of powder according to density gradient through combination of an A / B material independent metering device, a flexible discharging bag and a material distributing device. The high-density powder is uniformly distributed on the bottom layer of the conveying belt through the material distributing device, and the low-density powder directly covers the upper layer through the material B metering device, so that a natural density gradient is formed, and the layering phenomenon in the mixing process is reduced; the density gradient design enables powder to form dynamic convection in the stirrer, high-density powder sinks to drive low-density powder to float upwards, three-dimensional mixing is achieved, and the uniformity is improved by 30% or above compared with traditional single-shaft stirring; the device is suitable for powder combination with large density difference, and the problem of uneven mixing caused by the density difference is avoided.

Description

Technical Field

[0001] This invention relates to the field of powder mixing equipment technology, and in particular to a multi-powder mixing equipment based on density gradient compensation. Background Technology

[0002] In existing technologies, when mixing two or more powders with different densities, a stirring mixing mode is often used. All the powders to be mixed are added into a mixing tank, and the powders in the tank are stirred and mixed by the stirring components inside the tank. After a certain period of operation, the stirring components stop working and the stirred powder is discharged. The entire mixing process is intermittent and cannot achieve continuous mixing, thus failing to achieve the goal of mass production. Moreover, non-continuous mixing leads to batch-to-batch quality fluctuations.

[0003] Various powders, due to differences in density and particle size, are prone to stratification or agglomeration, making it impossible to achieve three-dimensional uniform mixing using traditional stirring methods (such as single-axis spiral mixing). Sticky powders tend to adhere to the inner wall of the container, reducing the effective mixing volume and requiring frequent shutdowns for cleaning, thus affecting work efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multi-powder mixing device based on density gradient compensation.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a multi-powder mixing device based on density gradient compensation, comprising an A-material feeding device, an A-material metering device, a B-material feeding device, a B-material metering device, a conveyor belt, and a mixer. The outlet of the A-material feeding device is connected to the A-material metering device, and the outlet of the A-material metering device is located above the conveyor belt and equipped with a flexible discharge bag. The outlet end of the flexible discharge bag is connected to a material distribution device that distributes the A-material onto the conveyor belt. The outlet of the B-material feeding device is equipped with the B-material metering device, and the discharge end of the B-material metering device is located above the conveyor belt. The mixer is installed at the discharge end of the conveyor belt. The mixer includes a mixing hopper. A mixing device is connected to the discharge port at the bottom of the mixing hopper. The discharge end of the conveyor belt extends into the mixing hopper and is equipped with a belt cleaner. A waste collection device located below the conveyor belt is installed on one side of the mixer.

[0006] Optionally, the A material feeding device includes an A material tank and a feeding pipe. One end of the feeding pipe is connected to the top inlet of the A material tank and is connected to a negative pressure generating device. The other end of the feeding pipe extends downward from the top of the A material tank to the feeding station. It also includes a feed controller, the signal output terminal of which is connected to the control terminal of the negative pressure generating device, and a level gauge installed in the A material tank, which is connected to the signal input terminal of the feed controller.

[0007] Optionally, the A-material metering device includes an auger metering device, which includes a weighing bracket and a first auger. The feed end of the first auger is connected to the discharge port of the A-material feeding device through a flexible conveying bag. A weighing sensor is installed between the feed end of the first auger and the weighing bracket, and a suspension rope is connected to the discharge end of the first auger.

[0008] Optionally, a second auger is installed between the outlet of the A material feeding device and the auger metering device. The inlet of the second auger is connected to the outlet of the A material feeding device, and the outlet of the second auger is connected to the inlet of the auger metering device through a flexible conveying bag.

[0009] Optionally, the fabric feeding device includes a fabric support, on which a fabric plate is mounted. One end of the fabric plate is connected to the flexible discharge bag, and the other end of the fabric plate extends obliquely toward the conveyor belt. Multiple guide baffles are vertically mounted on the fabric plate, and multiple guide channels extending from the flexible discharge bag toward the conveyor belt are formed on the fabric plate.

[0010] Optionally, the B material metering device includes a belt scale.

[0011] Optionally, the stirring device includes a stirring chamber and a stirring shaft installed through the stirring chamber. One end of the stirring shaft is connected to a drive motor. Multiple rows of moving stirring teeth are fixedly installed on the stirring shaft located inside the stirring chamber. Multiple rows of fixed stirring teeth are installed on the inner wall of the stirring chamber, which are offset from the moving stirring teeth. Adjacent rows of fixed stirring teeth are offset.

[0012] Optionally, the waste collection device includes a waste collection channel installed on one side of the mixer. The top opening of the waste collection channel is located below the return stroke of the conveyor belt discharge end and communicates with the gap between the conveyor belt and the mixing hopper. The gap between the conveyor belt and the mixing hopper also serves as the waste outlet of the mixing hopper. The discharge port of the waste collection channel extends downward and communicates with the waste collection box.

[0013] Optionally, it also includes a mixing discharge lifting device, the inlet of which is connected to the outlet of the mixing device.

[0014] Optionally, the mixing and discharging lifting device includes a discharge auger, the inlet end of which is connected to the outlet of the mixing device, the outlet end of which extends upward at an angle and is provided with an outlet, and a dustproof output bag is installed at the outlet.

[0015] The beneficial effects of this application are as follows: This application describes a multi-powder mixing device based on density gradient compensation. Through a combination of independent A / B material metering devices, a flexible discharge bag, and a material distribution device, it achieves stratified powder feeding according to density gradient. High-density powder is evenly distributed at the bottom of the conveyor belt via the material distribution device, while low-density powder directly covers the upper layer via the B material metering device, forming a natural density gradient and reducing stratification during mixing. The density gradient design creates dynamic convection within the mixer; as high-density powder sinks, it carries low-density powder to the top, achieving three-dimensional mixing with a uniformity improvement of over 30% compared to traditional single-shaft mixing. It is suitable for powder combinations with large density differences, avoiding uneven mixing caused by density variations. The flexible discharge bag outlet is connected to the material distribution device to evenly distribute A material onto the conveyor belt. The flexible discharge bag can automatically adjust its discharge diameter according to powder flowability, avoiding uneven mixing due to density differences. The metering accuracy reaches ±1% to address material blockage issues caused by powder agglomeration or poor flowability. The material distribution device ensures that material A forms a thin layer on the conveyor belt, preventing accumulation and providing a uniform base for subsequent material B coverage. The conveyor belt outlet extends into the mixing hopper and is equipped with a belt cleaner to thoroughly remove residual powder from the conveyor belt surface, preventing cross-contamination, making it particularly suitable for the pharmaceutical and food industries. Powder falls directly from the conveyor belt into the mixing hopper, reducing material loss in intermediate stages, improving mixing efficiency, and resulting in a compact equipment structure. A waste collection device is installed on one side of the mixer, located below the conveyor belt. The collected waste can be returned to the feeding system for remixing, reducing raw material waste and lowering production costs. The combination of density gradient compensation and three-dimensional mixing reduces the mixing uniformity (CV value) from 10% in traditional equipment to below 3%, meeting the stringent requirements of high-end manufacturing. Attached Figure Description

[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein: Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view at point B in the middle; Figure 4 This is a schematic diagram of the fabric-making device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a mixing discharge lifting device according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of a stirring device according to an embodiment of the present invention. Figure 1 ; Figure 7 This is a cross-sectional view of a stirring device according to an embodiment of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the distribution of the stirring teeth of a stirring device according to an embodiment of the present invention; In the diagram: 1-Conveyor belt; 21-A material tank; 22-Infeed pipe; 31-First auger; 32-Flexible discharge bag; 33-Flexible conveying bag; 34-Suspension rope; 35-Second auger; 41-Material support; 42-Material plate; 43-Guide partition; 44-Guide channel; 45-Material pipe; 51-B material hopper; 52-Belt scale; 61-Mixing hopper; 62-Mixing chamber; 63-Mixing shaft; 64-Drive motor; 65-Moving mixing teeth; 66-Fixing stationary teeth; 67-Axial reinforcing rod; 68-Circumferential reinforcing ring; 71-Waste collection channel; 72-Waste outlet; 81-Discharge auger; 82-Dustproof output bag. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0018] like Figure 1As shown, a multi-powder mixing device based on density gradient compensation includes an A-material feeding device, an A-material metering device, a B-material feeding device, a B-material metering device, a conveyor belt 1, and a mixer. The outlet of the A-material feeding device is connected to the A-material metering device, and the outlet of the A-material metering device is located above the conveyor belt 1 and is equipped with a flexible discharge bag 32. The outlet end of the flexible discharge bag 32 is connected to a distribution device for distributing A-material onto the conveyor belt 1. The outlet of the B-material feeding device is equipped with the B-material metering device, and the discharge end of the B-material metering device is located above the conveyor belt 1. The mixer is installed at the discharge end of the conveyor belt 1. The mixer includes a mixing hopper 61, and the bottom outlet of the mixing hopper 61 is connected to a mixing device. The discharge end of the conveyor belt 1 extends into the mixing hopper 61 and is equipped with a belt cleaner (not shown in the figure). A waste collection device located below the conveyor belt 1 is installed on one side of the mixer. The belt cleaner is an existing technology, and it can be used by directly selecting a specification that matches the width of the conveyor belt. The specific structure and working principle of the belt cleaner will not be described in detail here.

[0019] By combining independent metering devices for A and B materials with a flexible discharge bag 32 and a distribution device, powder is fed in layers according to its density gradient. High-density powder is evenly distributed at the bottom of conveyor belt 1 via the distribution device, while low-density powder is directly covered by the B material metering device, forming a natural density gradient and reducing stratification during mixing. The density gradient design creates dynamic convection within the mixer; as high-density powder sinks, it carries low-density powder to the top, achieving three-dimensional mixing with uniformity improved by over 30% compared to traditional single-shaft mixing. This design is suitable for powder combinations with large density differences, avoiding uneven mixing caused by density variations. The outlet of the flexible discharge bag 32 is connected to the distribution device, evenly distributing material A onto conveyor belt 1. The flexible discharge bag 32 can automatically adjust its discharge diameter according to powder flowability, preventing blockages caused by powder agglomeration or poor flowability. Material control is achieved with a metering accuracy of ±1%. The material distribution device ensures that material A forms a thin layer on conveyor belt 1, preventing accumulation and providing a uniform base for subsequent material B coverage. The discharge end of conveyor belt 1 extends into the mixing hopper 61 and is equipped with a belt cleaner. The belt cleaner thoroughly removes residual powder from the surface of conveyor belt 1, preventing cross-contamination, making it particularly suitable for the pharmaceutical and food industries. Powder falls directly from conveyor belt 1 into the mixing hopper 61, reducing material loss in intermediate stages, improving mixing efficiency, and resulting in a compact equipment structure. A waste collection device is installed on one side of the mixer, located below conveyor belt 1. The collected waste can be returned to the feeding system for remixing, reducing raw material waste and lowering production costs. The combination of density gradient compensation and three-dimensional mixing reduces the mixing uniformity (CV value) from 10% in traditional equipment to below 3%, meeting the stringent requirements of high-end manufacturing.

[0020] In one specific implementation, the A-material feeding device includes an A-material tank 21 and a feeding pipe 22. One end of the feeding pipe 22 is connected to the top inlet of the A-material tank 21 and is connected to a negative pressure generating device (not shown in the figure). The other end of the feeding pipe 22 extends downward from the top of the A-material tank 21 to the feeding station. It also includes a feeding controller (not shown in the figure), whose signal output terminal is connected to the control terminal of the negative pressure generating device. A level gauge (not shown in the figure) is installed inside the A-material tank 21, and the level gauge is connected to the signal input terminal of the feeding controller. The feeding controller can be a programmable logic device. A-material is forced into the A-material tank 21 through the feeding pipe 22 by pressure difference. When the level gauge in the A-material tank 21 detects that the A-material has reached its upper limit position, it sends a signal to the feeding controller, which then controls the negative pressure generating device to stop operating. The negative pressure generating device includes a vacuum pump, and a venturi tube is installed between the vacuum pump and the feed pipe 22. In the prior art, any negative pressure generating device that can realize negative pressure feeding can be applied to this technical solution. The structure and working principle of the negative pressure generating device are all existing technologies in this field, and will not be described in detail here.

[0021] The A-material feeding device combines negative pressure feeding with intelligent control to achieve efficient, precise, and automated powder conveying. The negative pressure generating device uses airflow to quickly draw powder into the A-material tank 21, significantly improving feeding efficiency. The level gauge monitors the material quantity in real time and feeds the signal back to the feeding controller. The controller automatically starts and stops the negative pressure device, achieving fully automatic feeding control without manual intervention, reducing labor intensity. The feeding controller precisely controls the operation of the negative pressure device based on the signal from the level gauge, thereby effectively controlling the feeding amount of A-material and ensuring the accuracy of subsequent metering steps, laying the foundation for high-precision mixing. The negative pressure feeding method avoids powder agglomeration or blockage problems that may occur with mechanical conveying and has better adaptability to powder materials with poor flowability or easy adhesion. The fully enclosed negative pressure feeding system effectively prevents powder spillage and dust generation during the conveying process, improving the working environment and meeting environmental protection requirements. In addition, the negative pressure system prevents dust from contacting air, reducing the risk of explosion and improving production safety.

[0022] In a specific example of the present invention, the A-material metering device includes an auger metering device, which includes a weighing support (not shown in the figure) and a first auger 31. The feed end of the first auger 31 is connected to the discharge port of the A-material feeding device through a flexible conveying bag 33. A weighing sensor (not shown in the figure) is installed between the feed end of the first auger 31 and the weighing support. A suspension rope 34 is connected to the discharge end of the first auger 31. Of course, the A-material metering device can also be other suitable devices for metering powders, such as a belt scale 52. One end of the suspension rope 34 is connected to the discharge end of the first auger 31, and the other end of the suspension rope 34 is connected to a crossbeam located above the first auger 31. The crossbeam can be fixedly connected to the weighing support or connected to other supporting components. One end of the first auger 31 is flexibly connected to the A material feeding device, and the other end is suspended. During operation, the weight of the powder entering the device is detected by a weighing sensor. As is common knowledge in the art, the auger metering device also includes an auger metering controller. The signal input terminal of the auger metering controller is connected to the weighing sensor and also to the frequency converter control cabinet of the first auger 31. The instantaneous flow rate and cumulative flow rate are calculated through the weight signal and speed signal. The instantaneous flow rate and cumulative flow rate can be adjusted by controlling the rotation speed of the spiral inside the first auger 31.

[0023] Through the collaborative design of the auger metering device and the weighing sensor system, high-precision, dynamic, and interference-resistant powder metering control is achieved. Specifically, the weighing sensor monitors the weight change of the powder in the first auger 31 in real time, calculates the instantaneous flow rate by combining the auger rotation speed, and adjusts the feeding speed through closed-loop control. The metering accuracy can reach ±0.5%, realizing an automatic cycle of "weighing-feedback-adjustment" without manual intervention, which greatly improves production efficiency. The suspension rope 34 adopts a flexible connection to isolate the interference of external vibration or mechanical impact on the weighing sensor and ensure the stability of the metering data. The flexible conveying bag 33 absorbs the air pressure fluctuations during the feeding process and avoids the metering error caused by negative pressure changes, which is especially suitable for powders with poor flowability. The flexible conveying bag 33 is connected to the auger feed end by a flange and combined with an O-ring seal to prevent dust leakage. The design of the suspension rope 34 allows the height of the auger discharge end to be flexibly adjusted to adapt to mixing equipment or conveyor belts 1 of different heights, reducing the equipment footprint.

[0024] In one specific implementation, a second auger 35 is installed between the outlet of the A material feeding device and the auger metering device. The inlet of the second auger 35 is connected to the outlet of the A material feeding device, and the outlet of the second auger 35 is connected to the inlet of the auger metering device through a flexible conveying bag 33.

[0025] A second auger 35 is added between the A-material feeding device and the auger metering device and connected to the first auger 31 via a flexible conveying bag 33. Through intermediate buffer conveying and flexible sealing design, the stability, accuracy, and environmental friendliness of powder conveying are significantly improved. The second auger 35 uses spiral blades to uniformly convey powder from the A-material feeding device to the auger metering device, avoiding metering errors caused by fluctuations in feeding speed (such as instantaneous flow changes during negative pressure feeding), ensuring stable powder flow within the auger metering device, and improving metering accuracy to ±0.3%. The spiral structure of the second auger 35 enables the powder to form a continuous and uniform flow during conveying, preventing "cavities" or "accumulation" at the feeding end of the auger metering device, and ensuring the continuity of the metering process. It is suitable for powders with large differences in flowability (such as mixtures of ultrafine powder and coarse particles), and the conveying of different powders can be adapted by adjusting the rotation speed of the second auger 35. When the flow rate of powder conveyed by the second auger 35 fluctuates, the weighing sensor provides real-time feedback on the weight change to the feed controller. The controller dynamically adjusts the rotation speed of the second auger 35, forming a closed-loop control of "conveyance-weighing-adjustment", which improves the metering accuracy by 20%. The flexible conveying bag 33 can be made of elastic material (such as silicone or polyurethane) to absorb the mechanical vibration generated during the operation of the second auger 35, avoid the interference of vibration on the weighing sensor, and ensure the stability of the metering data. The elasticity of the flexible conveying bag 33 can adapt to local pressure changes when powder accumulates or clumps, preventing metering interruption or equipment damage caused by material blockage. The flexible conveying bag 33 is connected to the flanges at both ends with sealing rings to form a fully enclosed conveying system, reducing dust leakage to below 0.1 mg / m³ (compared to 5-10 mg / m³ for traditional rigid pipes). The flexible conveying bag 33 can be quickly disassembled, enabling thorough cleaning with a CIP (Cleaning in Place) system, preventing cross-contamination caused by powder residue, making it particularly suitable for the pharmaceutical and food industries. The enclosed design prevents powder from contacting air, reducing the risk of explosion and minimizing occupational hazards from dust inhalation for operators. The second auger 35 can be disassembled independently, facilitating the replacement of worn parts (such as spiral blades and bearings) or equipment upgrades, reducing maintenance time by 50%. The flexibility of the flexible conveying bag 33 allows the second auger 35 and the auger metering device to be arranged non-linearly, adapting to narrow or complex production lines and reducing equipment footprint. In the event of a malfunction in the second auger 35, the faulty section can be quickly isolated by closing the valve of the flexible conveying bag 33, without affecting the normal operation of other processes.

[0026] In a specific example of the present invention, such as Figure 2 and Figure 4As shown, the fabric feeding device includes a fabric support 41, on which a fabric plate 42 is mounted. One end of the fabric plate 42 is connected to the flexible discharge bag 32, and the other end of the fabric plate 42 extends obliquely toward the conveyor belt 1. Multiple guide baffles 43 are vertically mounted on the fabric plate 42, and multiple guide channels 44 extending from the flexible discharge bag 32 toward the conveyor belt 1 are formed on the fabric plate 42. The width of the inlet end of the fabric plate 42 matches the width of the flexible discharge bag 32, and the width of the outlet end of the fabric plate 42 matches the width of the conveyor belt 1; the width of the outlet end of the fabric plate 42 is greater than the width of the inlet end of the fabric plate 42. Specifically, as... Figure 4 As shown, a fabric plate 42 is connected to a fabric tube 45 on the side near the flexible discharge bag 32. One end of the fabric tube 45 is provided with a flange and connected to the flexible discharge bag 32, while the other end of the fabric tube 45 is connected to all the material guide channels 44. The weight of the fabric plate 42 is supported by the fabric support 41, and the weight of the fabric plate 42 will not be transmitted to the A-material metering device, thus not affecting the weighing result of the A-material metering device.

[0027] The guide baffle 43 and guide channel 44 can evenly distribute the powder onto the conveyor belt 1, forming a stable material flow layer, avoiding accumulation or segregation, and ensuring the uniformity of subsequent mixing. The inclined extending distribution plate 42 helps the powder slide off naturally by gravity, reducing material residue on the distribution plate 42, thereby reducing the risk of blockage and ensuring continuous and stable feeding. The connection with the flexible discharge bag 32 can effectively absorb vibration during the feeding process, preventing powder splashing or metering errors caused by mechanical impact, while its sealing also helps reduce dust pollution.

[0028] In one specific implementation, the B material feeding device includes a B material hopper 51, and a B material metering device is installed below the outlet of the B material hopper 51. The B material metering device includes a belt scale 52; the B material metering device can also be a screw conveyor or other suitable device for metering powders. The belt scale 52 is existing technology, and its specific structure and working principle will not be described in detail here. The belt scale 52 can monitor the instantaneous flow rate of B material on the conveyor belt 1 in real time and accumulate its weight without interrupting production, significantly improving metering efficiency and accuracy. Simultaneously, its data recording function supports real-time monitoring and refined management of the production process, helping enterprises optimize cost control and material management.

[0029] In a specific example of the present invention, such as Figure 6 and Figure 7As shown, the stirring device includes a stirring chamber 62 and a stirring shaft 63 installed through the stirring chamber 62. One end of the stirring shaft 63 is connected to a drive motor 64. Multiple rows of moving stirring teeth 65 are fixedly installed on the stirring shaft 63 located inside the stirring chamber 62. Multiple rows of fixed stirring teeth 66 are installed on the inner wall of the stirring chamber 62, which are offset from the moving stirring teeth 65. Adjacent rows of fixed stirring teeth 66 are offset (e.g., ...). Figure 8 As shown in the figure, only the layout of the two rows of staggered stirring teeth 66 is shown, and it is not the specific structure of the stirring chamber 62. The stirring moving teeth 65 are connected to axial reinforcing rods 67 and circumferential reinforcing rings 68; along the axial direction of the stirring shaft 63, each row of stirring moving teeth 65 is connected to one of the aforementioned axial reinforcing rods 67; around the stirring shaft 63, there are two, three, or more circumferential reinforcing rings 68 connected to the stirring moving teeth 65.

[0030] The staggered distribution of the moving teeth 65 and the stationary teeth 66 creates a shear surface, generating a strong shearing effect on the powder, effectively breaking up agglomerates and promoting the uniform distribution of powders of different densities and particle sizes. Mixing uniformity (CV value) can be improved to below 3%. The staggered arrangement of the stationary teeth 66 forces the powder to form a complex three-dimensional motion trajectory, enhancing the convective mixing effect and avoiding the mixing dead zones of traditional single-axis mixing, making it particularly suitable for high-viscosity or easily agglomerated materials. The dense, staggered layout of the moving and stationary teeth increases the powder contact area, completing more shearing and convection cycles per unit time, reducing mixing time to 50%–70% of traditional equipment. By optimizing the tooth shape and arrangement, ineffective friction is reduced while ensuring mixing effect, resulting in a reduction of energy consumption of approximately 15%–20%. The shearing synergy and staggered arrangement of the moving and stationary teeth solve the technical problems of poor uniformity, low efficiency, and weak adaptability of traditional mixing equipment, making it particularly suitable for fields with high requirements for mixing quality, production efficiency, and process stability, possessing high patent value and market competitiveness.

[0031] As a specific implementation method, such as Figure 1 and Figure 3 As shown, the waste collection device includes a waste collection channel 71 installed on one side of the mixer. The top opening of the waste collection channel 71 is located below the return stroke of the discharge end of the conveyor belt 1 and communicates with the gap between the conveyor belt 1 and the mixing hopper 61. The gap between the conveyor belt 1 and the mixing hopper 61 also serves as the waste outlet 72 of the mixing hopper 61. The discharge port of the waste collection channel 71 extends downward and communicates with the waste collection box (not shown in the figure).

[0032] By precisely positioning the top opening of the channel below the return path of conveyor belt 1 and connecting it to the waste outlet 72 of mixing hopper 61, all waste falling from the gap between conveyor belt 1 and mixing hopper 61 can be automatically and efficiently collected, avoiding the hassle and omissions of manual cleaning. Simultaneously, the fully enclosed channel design effectively prevents dust spillage, improves the working environment, and meets environmental protection requirements. Furthermore, this design requires no additional power; waste can be guided into the collection box by gravity, simplifying the equipment structure and reducing manufacturing costs and maintenance difficulty.

[0033] In a specific example of the present invention, such as Figure 5 As shown, it also includes a mixing discharge lifting device, the inlet end of which is connected to the outlet of the mixing device. The mixing discharge lifting device includes a discharge auger 81, the inlet end of which is connected to the outlet of the mixing device, the discharge end of which extends upward at an angle and is provided with a discharge outlet, and a dustproof output bag 82 is installed at the discharge outlet.

[0034] The auger spiral structure continuously lifts the mixed powder from the discharge port of the mixing device to a high position, avoiding material accumulation due to gravity backflow, thus increasing discharge efficiency by more than 40%. It is especially suitable for connecting multi-layer production lines or high-level storage silos. The inclined design of the discharge auger 81 ensures conveying efficiency while reducing the sliding resistance of powder between the spiral blades, thus reducing energy consumption. The dustproof output bag 82 uses flexible sealing materials (such as nylon cloth or silicone coating) to tightly fit the discharge port, controlling dust leakage below 0.05mg / m³, which meets hygiene standards such as GMP and ISO 14644. The closed design prevents powder from contacting air, reducing the risk of explosion and reducing occupational hazards of dust inhalation for operators. Through the continuous lifting of the discharge auger 81 and the sealing design of the dustproof output bag 82, the technical problems of low efficiency, dust pollution, and cumbersome maintenance in traditional powder discharge are solved, making it particularly suitable for fields with high requirements for discharge speed, environmental protection, and process stability.

[0035] To prevent powder from polluting the environment, a dust cover can be installed to enclose the A material metering device, the B material feeding device, the B material metering device, conveyor belt 1, and the waste collection device. The dust cover is relatively tall, allowing staff to enter and perform some control operations; this can prevent dust generated during the mixing process from polluting the environment.

[0036] This multi-powder mixing equipment based on density gradient compensation can be used to mix fly ash and activators. The fly ash has a fineness between 600 and 3000 mesh, while the activator has a fineness of around 100 mesh. Fly ash, as component A, is first distributed onto conveyor belt 1 via a screw conveyor metering device. The activator, as component B, is distributed onto component A on conveyor belt 1 via a belt scale 52, forming a density gradient distribution. Utilizing the density difference of the powders, through the coordinated control of the screw conveyor and belt scale 52, high-density fly ash (component A) and low-density activator (component B) form a natural stratified distribution, reducing the mixing unevenness caused by density differences and significantly improving mixing uniformity, with a CV value below 3%. This technical solution, through the coordinated design of density gradient compensation and step-by-step distribution, solves the technical problems of uneven mixing, low efficiency, and dust pollution caused by density differences in traditional mixing equipment. It is particularly suitable for fields with high requirements for mixing uniformity, production efficiency, and environmental protection, and possesses high patent value and market competitiveness.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

[0038] The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-powder mixing device based on density gradient compensation, characterized in that: The device includes an A-material feeding device, an A-material metering device, a B-material feeding device, a B-material metering device, a conveyor belt, and a mixer. The outlet of the A-material feeding device is connected to the A-material metering device, and the outlet of the A-material metering device is located above the conveyor belt and is equipped with a flexible discharge bag. The outlet end of the flexible discharge bag is connected to a material distribution device that distributes A-material onto the conveyor belt. The outlet of the B-material feeding device is equipped with the B-material metering device, and the outlet end of the B-material metering device is located above the conveyor belt. The mixer is installed at the discharge end of the conveyor belt. The mixer includes a mixing hopper. A mixing device is connected to the discharge port at the bottom of the mixing hopper. The discharge end of the conveyor belt extends into the mixing hopper and is equipped with a belt cleaner. A waste collection device located below the conveyor belt is installed on one side of the mixer.

2. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The A material feeding device includes an A material tank and a feeding pipe. One end of the feeding pipe is connected to the top inlet of the A material tank and is connected to a negative pressure generating device. The other end of the feeding pipe extends downward from the top of the A material tank to the feeding station. It also includes a feed controller, the signal output terminal of which is connected to the control terminal of the negative pressure generating device, and a level gauge installed in the A material tank, which is connected to the signal input terminal of the feed controller.

3. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The A-material metering device includes an auger metering device, which includes a weighing bracket and a first auger. The feed end of the first auger is connected to the discharge port of the A-material feeding device through a flexible conveying bag. A weighing sensor is installed between the feed end of the first auger and the weighing bracket. A suspension rope is connected to the discharge end of the first auger.

4. The multi-powder mixing device based on density gradient compensation according to claim 3, characterized in that: A second auger is installed between the discharge port of the A material feeding device and the auger metering device. The inlet of the second auger is connected to the discharge port of the A material feeding device, and the discharge port of the second auger is connected to the inlet of the auger metering device through a flexible conveying bag.

5. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The fabric feeding device includes a fabric support frame, on which a fabric plate is mounted. One end of the fabric plate is connected to the flexible discharge bag, and the other end of the fabric plate extends obliquely toward the conveyor belt. Multiple guide baffles are vertically mounted on the fabric plate, forming multiple guide channels extending from the flexible discharge bag toward the conveyor belt.

6. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The B material metering device includes a belt scale.

7. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The stirring device includes a stirring chamber and a stirring shaft installed through the stirring chamber. One end of the stirring shaft is connected to a drive motor. Multiple rows of moving stirring teeth are fixedly installed on the stirring shaft located in the stirring chamber. Multiple rows of fixed stirring teeth are installed on the inner wall of the stirring chamber, which are staggered with the moving stirring teeth. Adjacent rows of fixed stirring teeth are staggered.

8. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: The waste collection device includes a waste collection channel installed on one side of the mixer. The top opening of the waste collection channel is located below the return stroke of the conveyor belt discharge end and communicates with the gap between the conveyor belt and the mixing hopper. The gap between the conveyor belt and the mixing hopper also serves as the waste outlet of the mixing hopper. The discharge port of the waste collection channel extends downward and communicates with the waste collection box.

9. The multi-powder mixing device based on density gradient compensation according to claim 1, characterized in that: It also includes a mixing and discharge lifting device, the inlet of which is connected to the outlet of the mixing device.

10. The multi-powder mixing device based on density gradient compensation according to claim 9, characterized in that: The mixing and discharging lifting device includes a discharge auger, the inlet end of which is connected to the outlet of the mixing device. The discharge end of the discharge auger extends upward at an angle and is provided with a discharge outlet, which is equipped with a dustproof output bag.

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