A wind force classifying sand making device and method

Abstract

This invention specifically relates to a wind-powered classification and sand-making device and method. The device includes a raw material silo, a material air classification system, an oversized material crushing system, a dust removal device, and a stone powder silo. The material air classification system includes a primary air classification system and a secondary air classification system. The raw material silo feeds material to the material air classification system. The primary air classification system separates micro-powder, first fine particles, and first coarse particles. The secondary air classification system separates micro-powder, second fine particles, and second coarse particles. The first and second fine particles are mixed to form manufactured sand. The first and second coarse particles are fed to the oversized material crushing system for crushing to form crushed material. The crushed material is then fed back to the material air classification system for further air classification. The material air classification system achieves two-stage air classification, forming a loop with the oversized material crushing system, enabling material circulation, facilitating adjustment of the fineness modulus, ensuring continuous product gradation, and effectively guaranteeing product quality.

Description

Technical Field

[0001] This invention relates to the field of manufactured sand processing and production technology in the sand and gravel aggregate industry, specifically to a wind-powered grading sand making device and method. Background Technology

[0002] Infrastructure construction is a crucial support for development, and with economic growth, the construction industry has become increasingly inseparable from our lives. Sand is one of the basic materials in modern construction engineering, belonging to fine aggregates in concrete production, with a particle size generally below 4.75mm. Sand can be classified according to its source into natural sand, manufactured sand, and mixed sand. In the past, my country's construction sand mainly consisted of natural sand. The formation of natural sand requires hundreds of millions of years, making it a precious and non-renewable natural resource in the short term. With the rapid development of my country's construction market and the increasing emphasis on environmental protection, the imbalance between the supply and demand of natural sand has become increasingly prominent. Illegal sand mining activities in rivers are rampant in various regions, seriously endangering the safety of river embankments, bridges, and navigation, and also causing serious impacts on urban drinking water and aquatic ecosystem safety.

[0003] To address this issue, starting in the 1960s, the hydropower and construction sectors began research on the production and engineering applications of manufactured sand. Since 1978, with the rapid economic development, the demand for sand and gravel has continuously increased, leading to a severe shortage of natural sand. Manufactured sand has gradually replaced natural sand and taken a dominant position in the market. To adapt to the need for manufactured sand to replace natural sand and to standardize and promote its engineering applications, the modern industry standard "Standard for Quality and Testing Methods of Sand and Stone for Ordinary Concrete" (JGJ52-2006) added artificial sand categories and clarified its definition, technical requirements, and testing methods. The latest revised national standard "Sand for Construction" (GB / T14684-2022) further clarifies and revises the definition, categories, and related technical requirements of manufactured sand.

[0004] Currently, there are three main forms of manufactured sand production in China: first, producing manufactured sand using specialized building stone mines; second, obtaining artificially manufactured sand that meets gradation requirements by crushing and screening river pebbles; and third, obtaining manufactured sand that meets requirements by simply processing and screening tailings from various metal processing plants. Traditional manufactured sand preparation mainly involves two processes: wet and dry. The core equipment in the wet sand production process is the rod mill, which was widely used in the early water conservancy and hydropower industries. The wet sand production process suffers from problems such as high water consumption, severe fine sand loss, and low output.

[0005] To address the above issues, dry sand making technology, with vertical shaft impact crushers as its core equipment, emerged and was widely adopted in the water conservancy and hydropower industry in the early 21st century, becoming the mainstream technology and equipment for manufactured sand production. After crushing, the raw materials for dry sand making typically yield three types of products: coarse particles (particles larger than the required size), fine particles (particles of the required size), and microparticles (particles smaller than the required size). The coarse particles are used for re-crushing, the fine particles are used for sand making, and the microparticles need to be collected by a dust collection device.

[0006] However, in conventional dry sand production, vertical shaft impact crushers are used for crushing, followed by screening. If the screens wear out after prolonged use and are not replaced in time, or if the screen aperture is not properly set, the size of the screened manufactured sand particles may not meet requirements, affecting the fineness modulus and causing discontinuous product gradation. Furthermore, the final manufactured sand produced by dry sand production is prone to contain impurities such as fine powder and dust, resulting in a high powder content, which affects the quality of the manufactured sand and fails to meet the requirements of the modern construction industry. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a wind-powered grading sand making device and method, which realizes two-stage air classification through a material air classification system, and forms a loop with an oversized material crushing system to realize material circulation, facilitate the adjustment of fineness modulus, ensure continuous product gradation, and effectively guarantee product quality.

[0008] To address the aforementioned technical problems, the present invention provides a wind-powered classification and sand-making device, comprising a raw material silo, a material air classification system, an oversized material crushing system, a dust removal device, and a stone powder silo. The material air classification system includes a primary air classification system and a secondary air classification system. The raw material silo supplies material to the material air classification system. The primary air classification system separates micro powder, first fine particles, and first coarse particles. The secondary air classification system separates micro powder, second fine particles, and second coarse particles. The first and second fine particles are mixed to form manufactured sand. The first and second coarse particles are fed into the oversized material crushing system for crushing to form crushed material. The crushed material is then fed into the material air classification system for further air classification.

[0009] Furthermore, the materials in the raw material warehouse are used as raw materials for the primary wind-driven sand separation system and are transported to the primary wind-driven sand separation system for primary wind separation; the input end of the secondary wind-driven sand separation system is connected to the output end of the oversized material crushing system, and the crushed material is used as raw materials for the secondary wind-driven sand separation system and is transported to the secondary wind-driven sand separation system for secondary wind separation.

[0010] Furthermore, the particle size of the micro powder is <0.075mm, the particle size of the first fine particles is 0.075mm to 2mm, and the particle size of the first coarse particles is >2mm.

[0011] Furthermore, the particle size of the second fine particle is 0.075 mm to 4.75 mm, and the particle size of the second coarse particle is > 4.75 mm.

[0012] Furthermore, the oversized material crushing system includes a crusher, which is a rolling sand making machine.

[0013] Furthermore, an inertial vibrating feeder is installed at the bottom of the raw material warehouse, which uniformly conveys the material to the material air classification and grading system.

[0014] To address the aforementioned technical problems, the present invention also provides a wind-powered grading sand making method, comprising the following steps:

[0015] Step 1: Feed raw materials into the material air classification system through the raw material warehouse;

[0016] Step 2: The primary air separation system separates the fine powder, the first fine particles, and the first coarse particles; the secondary air separation system separates the fine powder, the second fine particles, and the second coarse particles.

[0017] Step 3: The first fine particles and the second fine particles are mixed to form manufactured sand.

[0018] Step 4: The first and second coarse particles are conveyed to the oversized material crushing system for crushing to form crushed material;

[0019] Step 5: The crushed material is conveyed to the material air classification system for further air classification.

[0020] Furthermore, the material is conveyed to the primary wind-driven sand separation system, and the crushed material is used as raw material for the secondary wind-driven sand separation system for secondary wind separation.

[0021] Furthermore, the dust removal device is used to remove dust from the material air classification system and the oversized material crushing system.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) By setting up a material classification system that includes primary and secondary wind-driven sand separation systems, the raw materials can be finely classified, separating micro powder, fine particles of different particle size ranges, and coarse particles. This allows for more precise control of the particle composition of manufactured sand, resulting in continuous gradation of the final manufactured sand product, improving the quality stability of the manufactured sand, and ensuring that its fineness modulus meets product requirements. The corresponding coarse particles can be recycled and reused, improving the utilization rate of raw materials, effectively simplifying the production process, and reducing production energy consumption.

[0024] Meanwhile, the material air classification system operates under negative pressure, and fine powder is collected separately, preventing overflow. This reduces the need for dust removal equipment to some extent. Combined with the dust removal equipment, the entire system is free of significant dust, meeting environmental protection requirements, ensuring worker health and safety, and preventing fine powder and dust from mixing into the manufactured sand, thus ensuring the quality of the finished product.

[0025] (2) The material is first transported to the primary wind sand separation system. The crushed material is used as the raw material for the secondary wind sand separation system for secondary wind separation. The primary wind separation can initially separate the finer and coarser materials. The secondary wind separation further classifies the coarse particles after crushing. This material distribution method makes full use of the functions of the wind sand separation system at each level, realizes the rational recycling of materials, and makes the oversized material crushing system and the material wind separation and classification system form a closed loop. At the same time, it reduces the transfer links of materials between different equipment, reduces equipment wear and energy consumption, improves the efficiency and continuity of the entire sand making process, makes the operation of the sand making device more stable and efficient, and effectively guarantees the quality of manufactured sand products.

[0026] (3) The particle size ranges of micro powder, first fine particles, first coarse particles, second fine particles, and second coarse particles are clearly defined, providing a clear and accurate basis for the grading operation in the sand making process. Operators can precisely adjust and control the wind-separated sand system according to these standards to ensure that the materials separated by wind meet the expected quality requirements, thereby stably producing high-quality manufactured sand products and meeting the specific needs of different construction projects for the particle size and gradation of manufactured sand.

[0027] (4) The oversized material crushing system adopts a roller crushing machine, which has the advantages of large crushing ratio, high efficiency and low energy consumption. For hard stone raw materials, it can effectively crush oversized materials into suitable particle sizes, so that they can better participate in the subsequent air classification process, improve the adaptability of the entire sand making device to different raw materials, ensure the continuity and stability of manufactured sand production, and help improve production efficiency and reduce production costs.

[0028] (5) An inertial vibrating feeder is installed at the bottom of the raw material silo, which can uniformly and stably transport the material to the material air classification system. Uniform feeding can avoid the problem of unstable air sand classification effect caused by material accumulation or uneven flow, ensure that the air sand classification system at each level works under stable material flow and conditions, improve the accuracy and reliability of air classification, and thus improve the production efficiency and product quality stability of the entire sand making device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the wind-powered grading and sand-making device in an embodiment of the present invention.

[0030] Figure 2This is a schematic diagram of the separation principle of the high-efficiency multi-stage sand separator in this embodiment of the invention.

[0031] Figure 3 This is a schematic diagram illustrating the working principle of the first-stage horizontal flow static wind separation of the high-efficiency multi-stage sand separator in this embodiment of the invention.

[0032] Figure 4 This is a schematic diagram illustrating the working principle of the two-stage rotor-type dynamic wind-powered separation of the high-efficiency multi-stage sand separator in this embodiment of the invention.

[0033] In the diagram: 1. Raw material silo; 11. Inertial vibrating feeder; 2. Material air classification system; 21. Primary air sand separation system; 22. Secondary air sand separation system; 3. Oversized material crushing system; 4. Dust removal device; 5. Stone powder silo; 6. Manufactured sand;

[0034] 7. High-efficiency multi-stage sand separator; 71. First-stage horizontal flow static air separation chamber; 72. Second-stage rotor-type dynamic air separation chamber; 721. Rotor; 73. First discharge port; 74. Second discharge port; 75. Third discharge port; 76. Raw material inlet; 77. Material to be separated for secondary dynamic separation. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings: Specific Implementation Example 1:

[0037] refer to Figures 1 to 4 This invention discloses a wind-powered sand-making device (hereinafter referred to as the sand-making device), comprising a raw material silo 1, a material air classification system 2, an oversized material crushing system 3, a dust removal device 4, and a stone powder silo 5. The material air classification system 2 includes a primary air classification system 21 and a secondary air classification system 22. The raw material silo 1 feeds material to the material air classification system 2. The primary air classification system 21 air-classifies micro powder, first fine particles, and first coarse particles. The secondary air classification system 22 air-classifies micro powder, second fine particles, and second coarse particles. The first fine particles and second fine particles are mixed to form manufactured sand 6. The first coarse particles and second coarse particles are fed to the oversized material crushing system 3 for crushing to form crushed material. The crushed material is then fed to the material air classification system 2 for further air classification.

[0038] Preferably, in this embodiment, according to as follows Figure 1The material flow direction for sand making is shown. The output end of raw material silo 1 is connected to the feed end of the primary air-powered sand separation system 21. The material in raw material silo 1 is used as raw material for the primary air-powered sand separation system 21 and is transported to the primary air-powered sand separation system 21 for primary air separation. The input end of the secondary air-powered sand separation system 22 is connected to the output end of the oversized material crushing system 3. The crushed material is used as raw material for the secondary air-powered sand separation system 22 and is transported to the secondary air-powered sand separation system 22 for secondary air separation. The first fine particle discharge end of the primary air-powered sand separation system 21 and the second fine particle discharge end of the secondary air-powered sand separation system 22 are transported outward to the location of manufactured sand 6 for mixing to form manufactured sand 6. The first coarse particle discharge end of the primary air-powered sand separation system 21 and the second coarse particle discharge end of the secondary air-powered sand separation system 22 merge and connect to the input end of the oversized material crushing system 3, inputting crushed raw materials into the oversized material crushing system 3.

[0039] This setup first feeds the material to the primary air-separation system 21, where the crushed material serves as raw material for the secondary air-separation system 22. The primary air separation initially separates finer and coarser materials, while the secondary air separation further classifies the coarse-particle crushed material. This material distribution method fully utilizes the functions of each level of the air-separation system, achieving rational material recycling. It also creates a closed loop between the oversized material crushing system 3 and the material air-separation system 2, facilitating adjustments to the fineness modulus and ensuring continuous product gradation. Simultaneously, it reduces material transfer links between different devices, lowers equipment wear and energy consumption, improves the efficiency and continuity of the entire sand-making process, and makes the sand-making unit more stable and efficient, effectively guaranteeing the quality of the manufactured sand 6 product.

[0040] Of course, in other embodiments, when meeting actual usage requirements, the raw materials in the raw material warehouse 1 can be fed into the primary wind sand separation system 21 and the secondary wind sand separation system 22 for simultaneous wind separation, and the crushed material after being crushed by the oversized material crushing system 3 can be fed into the primary wind sand separation system 21 and the secondary wind sand separation system 22 for circulation.

[0041] In this embodiment, preferably, the particle size of the micro powder is <0.075mm, the particle size of the first fine particles is 0.075mm to 2mm, and the particle size of the first coarse particles is >2mm. The particle size of the second fine particles is 0.075mm to 4.75mm, and the particle size of the second coarse particles is >4.75mm. The particle size ranges of the micro powder, the first fine particles, the first coarse particles, the second fine particles, and the second coarse particles are clearly defined, providing a clear and accurate basis for the grading operation in the sand making process. Operators can precisely adjust and control the wind-separated sand system according to these standards to ensure that the materials separated by wind meet the expected quality requirements, thereby stably producing high-quality manufactured sand 6 products and meeting the specific needs of different construction projects for the particle size modulus and gradation of manufactured sand 6.

[0042] Of course, in other embodiments, depending on actual needs, the particle size range of micro powder, first fine particles, first coarse particles, second fine particles and second coarse particles can be flexibly adjusted by adjusting the circulating air volume parameters of the primary wind-driven sand separation system 21 and the secondary wind-driven sand separation system 22, so as to realize multiple classification of materials and finally mix and combine them to form manufactured sand 6.

[0043] In this embodiment, preferably, the oversized material crushing system 3 includes a crusher, which is a roller crushing machine. The roller crushing machine has advantages such as a large crushing ratio, high efficiency, and low energy consumption. For hard stone raw materials, it can effectively crush oversized materials into suitable particle sizes, allowing them to better participate in the subsequent air classification process. This improves the adaptability of the entire sand making device to different raw materials, ensures the continuity and stability of manufactured sand production 6, and helps to improve production efficiency and reduce production costs.

[0044] In this embodiment, preferably, an inertial vibrating feeder 11 is installed at the bottom of the raw material silo 1. The inertial vibrating feeder 11 uniformly conveys the material to the material air classification system 2. Uniform feeding can avoid the problem of unstable air classification effect caused by material accumulation or uneven flow, ensure that each level of the air classification system operates under stable material flow and conditions, improve the accuracy and reliability of air classification, and thus improve the production efficiency and product quality stability of the entire sand making device.

[0045] Preferably, in this embodiment, the micro-powder from the primary wind-driven sand separation system 21 and the secondary wind-driven sand separation system 22 flows along... Figure 1 The fine powder and dust in the material are collected and sent to the stone powder silo 5. A set of dust removal devices 4 are installed on the material air classification system 2 and the oversized material crushing system 3 to complete the dust collection and meet environmental protection requirements.

[0046] Preferably, in this embodiment, both the primary wind-driven sand separation system 21 and the secondary wind-driven sand separation system 22 adopt the following... Figure 2 The high-efficiency multi-stage sand separator 7 shown performs air-powered sand separation. This high-efficiency air-powered sand separator is a gas separator that uses high-speed airflow to disperse materials, classifying them based on the difference in inertia between coarse and fine particles in the airflow. Multiple classifications of materials can be achieved by adjusting the airflow rate. Simultaneously, a guiding device is installed inside the high-efficiency sand separator to guide materials into the vortex separation zone, where centrifugal force accelerates the settling of coarse particles.

[0047] In this embodiment, the high-efficiency multi-stage sand separator 7 includes two stages, with a raw material inlet 76. At the bottom of the high-efficiency multi-stage sand separator 7, a first outlet 73 and a second outlet 74 are arranged sequentially along the raw material feeding direction. A third outlet 75 is arranged above the second inlet. Coarse particles of the corresponding size are output from the first outlet 73, fine particles of the corresponding size are output from the second outlet 74, and micro powder is output from the third outlet 75.

[0048] Specifically, the high-efficiency multi-stage sand separator 7 includes a primary horizontal flow static air separation chamber 71 and a secondary rotor-type dynamic air separation chamber 72, achieving two-stage air separation combining static and dynamic air separation. The primary air separation uses low-energy-consumption, high-capacity horizontal flow static air separation, while the secondary separation employs high-precision rotor-type dynamic air separation. The primary separation performs preliminary separation of the raw materials, removing most of the coarse particles, reducing the throughput of the rotor-type air separator, and improving the efficiency of the secondary air separation.

[0049] Specifically, such as Figure 2 , 3 As shown, raw materials are input through the raw material inlet 76 and enter the primary horizontal flow static air separation chamber 71 under the action of a horizontal airflow with a velocity of V. Coarse particles of the corresponding size settle to the first outlet 73, while smaller particles, along with the airflow, form a gas-solid two-phase flow and are discharged from the outlet of the primary horizontal flow static air separation chamber 71, continuing upwards into the secondary rotor-type dynamic air separation chamber 72. The horizontal airflow velocity primarily ensures the separation particle size, while the airflow volume ensures the separation capacity. The working principle of the primary horizontal flow static air separation is as follows: Figure 2 The sorting particle size can be adjusted between 1.18 and 4.75 mm to meet the sorting ratio of various particle sizes of manufactured sand 6.

[0050] like Figure 2 , 4 As shown, the secondary air separation utilizes the centrifugal force generated by the rotor rotation and the air resistance generated by the airflow to separate fine particles and micro powders of corresponding particle sizes. Specifically, the gas-solid two-phase flow generated by the primary separation moves from the periphery of the rotor inward at a flow velocity V1, while the rotor rotates in a circle at a speed of ω. The material 77 to be dynamically separated in the secondary separation near the outer edge of the rotor simultaneously acquires two mutually perpendicular velocity components under the combined action of the airflow and the rotor.

[0051] Since the mass of the material to be dynamically separated in the second stage is very small, and neglecting the acceleration time, the two velocities of the material to be dynamically separated in the second stage can be approximated as a radial inward velocity of magnitude V and a circumferential velocity of magnitude rω along the rotor. Ignoring the weight of the material itself, the solid particles in the gas-solid two-phase flow experience two forces near the outer edge of the rotor: a centrifugal force F radially outward along the rotor and an air resistance R radially inward along the rotor. When the centrifugal force is greater than the air resistance, the particles will be unable to enter the rotor; when the centrifugal force is less than the air resistance, the particles will enter the rotor with the airflow, thus achieving powder separation.

[0052] In this embodiment, taking the high-efficiency multi-stage sand separator 7 of the primary wind-powered sand separation system 21 as an example, the wind speed V1 of its secondary rotor-type dynamic wind-powered powder separation chamber 72 is 4.5 m / s. The air flow state corresponding to this speed is the "transition layer", and the allowable moisture content of the raw material can reach 3%.

[0053] The sand making method based on the above-mentioned wind-powered grading sand making device includes the following steps:

[0054] Step 1: The raw materials are conveyed to the material air classification system 2 through the raw material warehouse 1.

[0055] Step 2: The primary wind-driven sand separation system 21 separates the micro powder, the first fine particles, and the first coarse particles. The secondary wind-driven sand separation system 22 separates the micro powder, the second fine particles, and the second coarse particles from the material. The micro powder is sent to the stone powder silo 5 for storage.

[0056] Step 3: The first fine particles and the second fine particles are mixed to form the first fine particles and the second fine particles to form the manufactured sand 6.

[0057] Step 4: The first and second coarse particles are conveyed to the oversized material crushing system 3 for crushing to form crushed material.

[0058] Step 5: The crushed material is conveyed to the material air classification system 2 for further air classification.

[0059] During operation, dust is simultaneously removed from the material air classification system 2 and the oversized material crushing system 3 using the dust removal device 4.

[0060] Specifically, the materials from the above steps are conveyed to the primary air-driven sand classification system 21, where micro-powder <0.075mm is separated, achieving the first-stage powder removal function of the raw materials. Simultaneously, by adjusting the circulating air volume of the sand classifier, the first fine particles from 0.075mm to 2mm are separated, with the maximum particle size of 2mm adjustable in real time according to the final product quality requirements and the product fineness modulus. The first coarse particles >2mm are sent to the oversized material crushing system 3 for circulating crushing.

[0061] Crushed material is transported to the secondary air-separation system 22 as raw material for secondary air separation. The secondary air separation produces three types of materials: micro powder <0.075mm, secondary fine particles from 0.075mm to 4.75mm, and secondary coarse particles >4.75mm. The maximum particle size of 4.75mm can be adjusted in real time according to the final product quality requirements and the product fineness modulus. This system enables functions such as inspection and screening of the finished manufactured sand 6, and secondary dust removal.

[0062] By setting up a two-stage high-efficiency wind-powered sand classifier system, the traditional air classifier and inspection screening equipment in sand making processes can be replaced, effectively simplifying the production process, reducing energy consumption, and improving product quality. The high-efficiency wind-powered sand classifier operates under negative pressure, eliminating dust overflow during normal production. All discharge ports are also under negative pressure, resulting in no significant dust generation. This allows for a substantial reduction in dust removal equipment configuration while meeting environmental protection requirements, saving energy. Furthermore, the high-efficiency wind-powered sand classifier is simple in design with few rotating parts, greatly reducing equipment maintenance and repair work.

[0063] In summary, this application, by setting up a material classification system 2 comprising primary and secondary wind-driven sand separation systems, enables detailed classification of raw materials, separating micro-powder, fine particles of different particle size ranges, and coarse particles. This allows for more precise control of the particle composition of the manufactured sand 6, resulting in continuous gradation of the final manufactured sand 6 product, improved quality stability, and ensuring that its fineness modulus meets product requirements. Correspondingly, coarse particles can be recycled and reused, improving raw material utilization, effectively simplifying the production process, and reducing energy consumption.

[0064] Meanwhile, the material air classification system 2 operates under negative pressure, and the fine powder is collected separately, preventing overflow. This reduces the need for dust removal device 4 to some extent. Combined with dust removal device 4, the entire device is free of significant dust, meeting environmental protection requirements, ensuring worker health and safety, and preventing fine powder and dust from mixing into the manufactured sand 6, thus ensuring the quality of the finished product.

[0065] The wind-powered grading sand making method provides a complete and orderly sand making process, from raw material transportation, wind grading, coarse particle crushing to the formation of manufactured sand 6. Each step is closely linked and interconnected. Operators following this method can produce manufactured sand 6 in an orderly manner, improve production efficiency, reduce quality problems and production interruptions caused by unclear operating procedures, ensure a stable supply of manufactured sand 6, and meet the needs of the construction market.

[0066] An embodiment of the wind-powered grading sand making method of the present invention has been described in detail in the embodiments of the wind-powered grading sand making device described above, and will not be repeated here.

[0067] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0068] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0069] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A wind force classifying sand making device, characterized by, It includes a raw material warehouse, a material air classification and grading system, an oversized material crushing system, a dust removal device, and a stone powder warehouse. The material air classification and grading system includes a primary air sand separation system and a secondary air sand separation system. The raw material warehouse supplies materials to the material air classification system. The primary air classification system separates micro powder, first fine particles, and first coarse particles. The secondary air classification system separates micro powder, second fine particles, and second coarse particles. The first fine particles and second fine particles are mixed to form manufactured sand. The first coarse particles and second coarse particles are fed into the oversized material crushing system for crushing to form crushed material. The crushed material is fed into the material air classification system for further air classification. The materials in the raw material warehouse are used as raw materials for the primary wind-powered sand separation system and are transported to the primary wind-powered sand separation system for primary wind separation. The input end of the secondary wind-powered sand separation system is connected to the output end of the oversized material crushing system, and the crushed material is used as raw material for the secondary wind-powered sand separation system and is transported to the secondary wind-powered sand separation system for secondary wind separation.

2. The wind force fractionating sand apparatus according to claim 1, wherein, The particle size of the micro powder is <0.075mm, the particle size of the first fine particles is 0.075mm to 2mm, and the particle size of the first coarse particles is >2mm.

3. The wind force fractionating sand apparatus of claim 1, wherein, The particle size of the second fine particle is 0.075 mm to 4.75 mm, and the particle size of the second coarse particle is > 4.75 mm.

4. The wind force fractionating sand apparatus of claim 1, wherein, The oversized material crushing system includes a crusher, which is a rolling sand making machine.

5. The wind force fractionating sand apparatus of claim 1, wherein, An inertial vibrating feeder is installed at the bottom of the raw material warehouse, which uniformly conveys the material to the material air classification and grading system.

6. A wind force classifying sand making method, realized by the wind force classifying sand making device according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Feed raw materials into the material air classification system through the raw material warehouse; Step 2: The primary air separation system separates the fine powder, the first fine particles, and the first coarse particles; the secondary air separation system separates the fine powder, the second fine particles, and the second coarse particles. Step 3: The first fine particles and the second fine particles are mixed to form manufactured sand. Step 4: The first and second coarse particles are conveyed to the oversized material crushing system for crushing to form crushed material; Step 5: The crushed material is conveyed to the material air classification system for further air classification.

7. The pneumatic classification sand production method according to claim 6, characterized in that, The material is conveyed to the primary wind-driven sand separation system, and the crushed material is used as raw material for the secondary wind-driven sand separation system for secondary wind separation.

8. The pneumatic classification sand production method according to claim 6, characterized in that, The dust removal device is used to remove dust from the material air classification system and the oversized material crushing system.

Images