Wind power grading sand making device and method

Abstract

The invention particularly relates to an air classification sand making device and method. The device comprises a raw material warehouse, a material winnowing and grading system, an oversize material crushing system, a dust removal device and a stone powder warehouse, wherein the material winnowing and grading system comprises a first-stage sand winnowing system and a second-stage sand winnowing system; the raw material warehouse conveys materials to the material winnowing and grading system, micro powder, first fine particles and first coarse particles are winnowed out by the first-stage sand winnowing system, and micro powder, second fine particles and second coarse particles are winnowed out by the second-stage sand winnowing system; the first fine particles and the second fine particles are mixed to form machine-made sand, the first coarse particles and the second coarse particles are input into the oversize material crushing system to be crushed to form crushed materials, and the crushed materials are input into the material winnowing and grading system to be continuously winnowed. Two-stage winnowing is achieved through the material winnowing grading system, a loop is formed in cooperation with the oversize material crushing system, material circulation is achieved, fineness modulus adjustment is facilitated, product grading continuity is guaranteed, and product quality is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of machine-made sand processing and production in the sandstone aggregate industry, and in particular to a wind-powered classification sand-making device and method. Background Art

[0002] Infrastructure construction is an important support for development. With the development of the economy, the construction industry is becoming more and more inseparable from our lives. Sand is one of the basic materials for modern construction projects. It is a fine aggregate in concrete production, and its particle size is generally below 4.75mm. Sand can be divided into natural sand, machine-made sand and mixed sand according to its source. In the past, my country's construction sand was mainly natural sand. The formation of natural sand takes hundreds of millions of years and is a precious natural resource that cannot be regenerated in a short period of time.

[0003] To solve this problem, the hydropower and construction departments have been conducting research on the production and engineering application of artificial sand since the 1960s. Since 1978, the economy has entered a stage of rapid development, the demand for sand and gravel has continued to increase, and the supply of natural sand is seriously insufficient. Artificial sand has gradually replaced natural sand and occupied a dominant position in the market. In order to meet the needs of artificial sand replacing natural sand, standardize and promote the engineering application of artificial sand, the modern industry standard "Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete" JGJ52-2006 has added artificial sand types and clarified the definition, technical requirements and inspection methods of artificial sand. In the latest revised national standard "Construction Sand" GB / T14684-2022, the definition, category and related technical requirements of artificial sand have been clarified and revised.

[0004] At present, there are three main forms of domestic machine-made sand production. The first is to use special building stone mines to produce machine-made sand. The second is to crush and screen the pebbles in the river channel to obtain artificial machine-made sand that meets the grading requirements. The third is to use various metal process tailings to obtain machine-made sand that meets the requirements after simple processing and screening. Traditional machine-made sand preparation mainly includes two processes: wet and dry production. The core equipment of the wet sand making process is the rod mill, which was widely used in the early water conservancy and hydropower industry. The wet sand making process has problems such as high water consumption, serious loss of fine sand and low output.

[0005] To solve the above problems, the dry sand making process with vertical shaft crusher as the core equipment stood out and was widely promoted and used in the water conservancy and hydropower industry in the early 21st century, becoming the mainstream process and equipment for machine-made sand production. After crushing, the raw materials of dry sand making usually produce three types of products: coarse particles (particles larger than the required particle size), fine particles (particles of the required particle size) and micro powder (particles smaller than the required particle size). Among them, coarse particles are used for re-crushing, fine particles are used for sand making, and micro powder needs to be sucked into the dust collection device for collection.

[0006] However, in conventional dry sand making, vertical shaft crusher is used for crushing, and then screening equipment is used for screening. After long-term use, the screen is worn and not replaced in time, or the screen hole diameter is set unreasonably, which can easily lead to the size of the machine-made sand particles screened out not meeting the requirements, affecting the fineness modulus and causing discontinuous product grading. At the same time, the machine-made sand of the final product of dry sand making is easily mixed with micro powder and dust, resulting in a high powder content, affecting the quality of the machine-made sand, and failing to meet the requirements of the modern construction industry for machine-made sand products. 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 separation through a material air separation and grading system, cooperates with an oversize material crushing system to form a loop, realizes material circulation, facilitates adjustment of the fineness modulus, ensures continuous product grading, and effectively guarantees product quality.

[0008] In response to the above technical problems, the technical solution provided by the present invention is a wind-powered grading sand-making device, comprising a raw material warehouse, a material air-selection and grading system, an oversize material crushing system, a dust removal device and a stone powder warehouse, wherein the material air-selection and grading system comprises a primary wind-powered sand-selecting system and a secondary wind-powered sand-selecting system; the raw material warehouse transports materials to the material air-selection and grading system, the primary wind-powered sand-selecting system air-selects micro-powder, first fine particles and first coarse particles, and the secondary wind-powered sand-selecting system air-selects micro-powder, second fine particles and second coarse particles; the first fine particles and the second fine particles are mixed to form machine-made sand, the first coarse particles and the second coarse particles are input into the oversize material crushing system for crushing to form crushed materials, and the crushed materials are input into the material air-selection and grading system for further air-selection.

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

[0010] Furthermore, the particle size of the micro powder is less than 0.075 mm, the particle size of the first fine particles is between 0.075 mm and 2 mm, and the particle size of the first coarse particles is greater than 2 mm.

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

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

[0013] Furthermore, an inertial vibrating feeder is provided at the bottom of the raw material warehouse, and the inertial vibrating feeder evenly transports the materials to the material air separation and grading system.

[0014] In view of the above technical problems, the present invention also provides a technical solution, a wind classification sand making method, comprising the following steps:

[0015] Step 1: Transport raw materials to the material air separation and grading system through the raw material warehouse;

[0016] Step 2: The first-level wind sand separation system separates the fine powder, the first fine particles and the first coarse particles by wind, and the second-level wind sand separation system separates the fine powder, the second fine particles and the second coarse particles by wind;

[0017] Step 3: The first fine particles and the second fine particles are mixed to form the first fine particles and the second fine particles are mixed to form machine-made sand;

[0018] Step 4: The first coarse particles and the second coarse particles are transported to an oversize material crushing system for crushing to form crushed materials;

[0019] Step 5: The crushed material is transported to the material air separation and grading system for further air separation.

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

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

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) By setting up a material air separation and classification system including a primary and secondary wind sand separation system, the raw materials can be carefully classified and fine powder, fine particles of different particle size ranges and coarse particles can be separated by air. The particle composition of the machine-made sand can be more accurately controlled, so that the final machine-made sand product grading is continuous, the quality stability of the machine-made sand is improved, and its fineness modulus meets the product requirements. The corresponding coarse particles can be recycled and reused, which improves the utilization rate of raw materials, effectively simplifies the production process, and reduces production energy consumption.

[0024] At the same time, the material air separation and grading system adopts negative pressure operation, and the fine powder is collected separately without overflowing after classification. To a certain extent, the configuration of the dust removal device can be reduced. Combined with the dust removal device, it can ensure that there is no obvious dust in the entire device, meet environmental protection requirements, ensure the health and safety of workers, and avoid mixing of fine powder and dust into the machine-made sand, thereby ensuring the quality of the finished product.

[0025] (2) The material is first transported to the primary wind sand separation system, and the crushed material is used as the raw material of the secondary wind sand separation system for secondary wind separation. The primary wind separation can initially separate finer and coarser materials, and the secondary wind separation further classifies the coarse particles after crushing. This material distribution method fully utilizes the functions of the wind sand separation systems at all levels, realizes the rational recycling of materials, and forms a closed circuit between the oversize material crushing system and the material wind separation and classification system. At the same time, it reduces the material transfer links 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 machine-made sand products.

[0026] (3) The particle size ranges of fine 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 classification operation in the sand making process. Operators can accurately debug and control the wind sand selection system based on these standards to ensure that the materials of each level selected by the wind meet the expected quality requirements, thereby stably producing high-quality machine-made sand products and meeting the specific requirements of different construction projects for the particle size and grading of machine-made sand.

[0027] (4) The oversize material crushing system adopts a roller-type sand making machine, which has the advantages of large crushing ratio, high efficiency and low energy consumption. For stone raw materials with higher hardness, it can effectively crush oversize materials into suitable particle sizes, so that they can better participate in the subsequent air separation and classification process, improve the adaptability of the entire sand making device to different raw materials, ensure the continuity and stability of machine-made 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 warehouse to evenly and stably transport the materials to the material air separation and classification system. Uniform feeding can avoid the problem of unstable wind sand separation effect caused by material accumulation or uneven flow, ensure that the wind sand separation system at all levels works under stable material flow and state, improve the accuracy and reliability of air separation and classification, and thus improve the production efficiency and product quality stability of the entire sand making device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of a wind-powered classification sand-making device in an embodiment of the present invention.

[0030] Figure 2 It is a separation principle diagram of a high-efficiency multi-stage sand separator in an embodiment of the present invention.

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

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

[0033] In the figure: 1. Raw material warehouse; 11. Inertial vibrating feeder; 2. Material air classification system; 21. First-level wind sand selection system; 22. Second-level wind sand selection system; 3. Oversize material crushing system; 4. Dust removal device; 5. Stone powder warehouse; 6. Machine-made sand;

[0034] 7. High-efficiency multi-stage sand separator; 71. First-stage horizontal flow static wind separation chamber; 72. Second-stage rotor-type dynamic wind powder separation chamber; 721. Rotor; 73. First discharge port; 74. Second discharge port; 75. Third discharge port; 76. Raw material feed port; 77. Material to be subjected to second-stage dynamic separation. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application: Specific embodiment 1:

[0037] refer to Figures 1 to 4 The present invention discloses a wind-force classification sand-making device (hereinafter referred to as the sand-making device), comprising a raw material warehouse 1, a material wind-selection classification system 2, an oversize material crushing system 3, a dust removal device 4 and a stone powder warehouse 5. The material wind-selection classification system 2 comprises a primary wind-force sand-selection system 21 and a secondary wind-force sand-selection system 22. The raw material warehouse 1 transports materials to the material wind-selection classification system 2. The primary wind-force sand-selection system 21 selects micro-powder, first fine particles and first coarse particles by wind. The secondary wind-force sand-selection system 22 selects micro-powder, second fine particles and second coarse particles by wind. The first fine particles and the second fine particles are mixed to form machine-made sand 6. The first coarse particles and the second coarse particles are input to the oversize material crushing system 3 for crushing to form crushed materials. The crushed materials are input to the material wind-selection classification system 2 for further wind selection.

[0038] Preferably, in this embodiment, according to Figure 1As shown in the flow direction of sand making materials, the output end of the raw material warehouse 1 is connected to the feed end of the primary wind sand selection system 21, and the materials in the raw material warehouse 1 are used as the raw materials of the primary wind sand selection system 21 and are transported to the primary wind sand selection system 21 for primary wind selection. The input end of the secondary wind sand selection system 22 is connected to the output end of the oversize material crushing system 3, and the crushed materials are used as the raw materials of the secondary wind sand selection system 22 and are transported to the secondary wind sand selection system 22 for secondary wind selection. The discharge end of the first fine particles of the primary wind sand selection system 21 and the discharge end of the second fine particles of the secondary wind sand selection system 22 are transported outward to the position of the machine-made sand 6 to mix and form the machine-made sand 6. The discharge end of the first coarse particles of the primary wind sand selection system 21 and the discharge end of the second coarse particles of the secondary wind sand selection system 22 are combined and connected to the input end of the oversize material crushing system 3, and the crushed raw materials are input to the oversize material crushing system 3.

[0039] In this way, the material is first transported to the first-level wind sand selection system 21, and the crushed material is used as the raw material of the second-level wind sand selection system 22 for the second-level wind selection. The first-level wind selection can initially separate the finer and coarser materials, and the second-level wind selection further classifies the coarse particles after crushing. This material distribution method fully utilizes the functions of the wind sand selection systems at all levels, realizes the rational recycling of materials, and forms a closed circuit between the oversize material crushing system 3 and the material wind selection and classification system 2, which is convenient for adjusting the fineness modulus and ensuring the continuous grading of products. At the same time, it reduces the material transportation links 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 the machine-made sand 6 product.

[0040] Of course, in other embodiments, when actual usage needs are met, the raw materials in the raw material warehouse 1 can also be input into the primary wind sand selection system 21 and the secondary wind sand selection system 22 for simultaneous wind selection, and the crushed materials after crushing by the oversize material crushing system 3 can be input into the primary wind sand selection system 21 and the secondary wind sand selection system 22 for circulation.

[0041] In this embodiment, preferably, the particle size of the micro powder is less than 0.075 mm, the particle size of the first fine particles is 0.075 mm to 2 mm, and the particle size of the first coarse particles is greater than 2 mm. The particle size of the second fine particles is 0.075 mm to 4.75 mm, and the particle size of the second coarse particles is greater than 4.75 mm. 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, so that the grading operation in the sand making process has a clear and accurate basis. Operators can accurately debug and control the wind sand selection system according to these standards to ensure that the materials of each level selected by the wind meet the expected quality requirements, thereby stably producing high-quality machine-made sand 6 products to meet the specific requirements of different construction projects for the particle size fineness modulus and grading of machine-made sand 6.

[0042] Of course, in other embodiments, according to actual needs, by adjusting the circulating air volume parameters of the first-level wind sand selection system 21 and the second-level wind sand selection system 22, the particle size ranges of the micropowder, the first fine particles, the first coarse particles, the second fine particles and the second coarse particles can be flexibly adjusted to achieve multiple classifications of the materials, which are finally mixed and combined to form machine-made sand 6.

[0043] In this embodiment, preferably, the oversize material crushing system 3 includes a crusher, and the crusher is a rolling sand making machine. The rolling sand making machine has the advantages of large crushing ratio, high efficiency, low energy consumption, etc. For stone raw materials with higher hardness, the oversize material can be effectively crushed into a suitable particle size, so that it can better participate in the subsequent air selection and classification process, improve the adaptability of the entire sand making device to different raw materials, ensure the continuity and stability of the production of machine-made sand 6, and help improve production efficiency and reduce production costs.

[0044] In this embodiment, preferably, an inertial vibrating feeder 11 is provided at the bottom of the raw material warehouse 1, and the inertial vibrating feeder 11 uniformly conveys the material to the material air separation and classification system 2. Uniform feeding can avoid the problem of unstable wind sand selection effect caused by material accumulation or uneven flow, ensure that the wind sand selection system at all levels works under stable material flow and state, improve the accuracy and reliability of air separation and classification, and thus improve the production efficiency and product quality stability of the entire sand making device.

[0045] Preferably, in this embodiment, the fine powder of the primary wind sand selection system 21 and the secondary wind sand selection system 22 is along Figure 1 The fine powder and dust in the collection flow are collected in the stone powder warehouse 5. A group of dust removal devices 4 are respectively set on the material air selection and classification system 2 and the oversize material crushing system 3 to complete the dust collection and meet the environmental protection requirements.

[0046] Preferably, in this embodiment, the first-stage wind sand selection system 21 and the second-stage wind sand selection system 22 are both Figure 2 The high-efficiency multi-stage sand separator 7 shown in the figure performs wind sand separation. The high-efficiency wind sand separator is a gas separator that uses high-speed airflow to disperse the material and classifies the material by relying on the different inertia of coarse and fine particles in the wind field. Multiple classifications of the material can be achieved by adjusting the air volume of the wind field. At the same time, a guide device is set in the high-efficiency sand separator to guide the material into the eddy current separation area, which can accelerate the sedimentation of coarse particles under the action of centrifugal force.

[0047] In this embodiment, the high-efficiency multi-stage sand separator 7 includes two stages, on which a raw material feed port 76 is provided, and at the bottom of the high-efficiency multi-stage sand separator 7, a first discharge port 73 and a second discharge port 74 are sequentially provided along the raw material feeding direction, and a third discharge port 75 is provided above the second feed port. Coarse particles of corresponding particle sizes are output from the first discharge port 73, fine particles of corresponding particle sizes are output from the second discharge port 74, and micro powder is output from the third discharge port 75.

[0048] Specifically, the high-efficiency multi-stage sand separator 7 includes a first-level horizontal flow static wind separation chamber 71 and a second-level rotor type dynamic wind separation chamber 72, realizing a second-level wind separation combining static wind separation and dynamic wind separation. The first-level wind separation uses a horizontal flow static wind separation with low energy consumption and large processing capacity, and the second-level separation uses a rotor type dynamic wind separation with high separation accuracy. The first-level separation can perform preliminary separation of the raw materials, separate most of the coarse particles, reduce the processing capacity of the rotor type powder separator, and improve the efficiency of the second-level wind separation.

[0049] Specifically, Figure 2 , 3 As shown, the raw material is input from the raw material feed port 76, and enters the first-level horizontal flow static wind separation chamber 71 under the action of the horizontal airflow with a speed of V, wherein the coarse particles of the corresponding particle size are deposited at the first discharge port 73, and the materials smaller than the coarse particles form a gas-solid two-phase flow with the airflow and are discharged from the outlet of the first-level horizontal flow static wind separation chamber 71, and continue to enter the second-level rotor type dynamic wind powder separation chamber 72 upward. The wind speed of the horizontal airflow mainly guarantees the separation particle size, and the air volume guarantees the separation capacity. The working principle of the first-level horizontal flow static wind 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 machine-made sand 6.

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

[0051] Since the mass of the material 77 to be dynamically classified is very small, without considering the acceleration time, the two speeds of the material 77 to be dynamically classified can be approximately the speed component V along the radial inward direction of the rotor and the speed component rω along the circumferential direction of the rotor. Without considering the weight of the material 77 to be dynamically classified, the solid particles in the gas-solid two-phase flow are subjected to two forces near the outer edge of the rotor, namely the centrifugal force F outward along the radial direction of the rotor and the air resistance R inward along the radial direction of the rotor. When the centrifugal force is greater than the air resistance, the particles will not be able to enter the interior of the rotor. When the centrifugal force is less than the air resistance, the particles will enter the interior of the rotor with the airflow, thereby achieving powder selection.

[0052] In this embodiment, taking the high-efficiency multi-stage sand selection machine 7 of the first-stage wind sand selection system 21 as an example, the wind speed V1 of its second-stage rotor type dynamic wind powder selection chamber 72 is 4.5m / s, and the air flow state corresponding to this speed is a "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 classification sand making device comprises the following steps:

[0054] Step 1: Transport raw materials to the material air separation and grading system 2 through the raw material warehouse 1.

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

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

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

[0058] Step 5: The crushed material is transported to the material air separation and grading system 2 for further air separation.

[0059] During the working process, the dust removal device 4 is used to synchronously remove the dust from the material air classification system 2 and the oversize material crushing system 3.

[0060] Specifically, the materials in the above steps are transported to the first-level wind sand selection system 21, and the fine powder of less than 0.075 mm is classified to achieve the first powder removal function of the raw materials. At the same time, the first fine particle materials of 0.075 mm to 2 mm can be classified by adjusting the circulating air volume of the sand selection machine, wherein the maximum particle size of 2 mm can be adjusted in real time according to the quality requirements of the final product and the product fineness modulus. The first coarse particle materials of more than 2 mm are sent to the oversize material crushing system 3 for cyclic crushing.

[0061] The crushed material is used as the raw material of the secondary wind sand separation system 22 and is transported to the secondary wind sand separation system 22 for secondary wind separation. The secondary wind separation can produce three kinds of materials: fine powder <0.075mm, second fine particles from 0.075mm to 4.75mm, and second coarse particles >4.75mm. Among them, the maximum particle size of 4.75mm can be adjusted in real time according to the quality requirements of the final product and the fineness modulus of the product. The finished machine-made sand 6 inspection and screening, the second powder removal and other functions are realized.

[0062] By setting up a two-stage high-efficiency wind sand selection system, the powder selection machine and inspection and screening equipment in the traditional sand making process can be replaced, effectively simplifying the production process, reducing production energy consumption, and improving product quality. The high-efficiency wind sand selection machine adopts negative pressure operation inside the equipment. There is no dust overflow during normal production. Each discharge port is also negative pressure, and there is no obvious dust. It can greatly reduce the configuration of dust removal equipment while meeting environmental protection requirements and save energy. At the same time, because the high-efficiency wind sand selection machine is simple and has fewer rotating parts, it can greatly reduce the inspection and maintenance of the equipment.

[0063] In summary, this application can perform detailed classification of raw materials by setting up a material air separation and classification system 2 including a primary and secondary wind sand separation system, and select micro powder, fine particles of different particle size ranges and coarse particles by air. The particle composition of the machine-made sand 6 can be controlled more accurately, so that the final machine-made sand 6 product grading is continuous, the quality stability of the machine-made sand 6 is improved, and its fineness modulus is ensured to meet the product requirements. The corresponding coarse particles can be recycled and crushed for reuse, which improves the utilization rate of raw materials, effectively simplifies the production process, and reduces production energy consumption.

[0064] At the same time, the material air separation and classification system 2 adopts negative pressure operation, and the fine powder is collected separately without overflowing after classification. To a certain extent, the configuration of the dust removal device 4 can be reduced. Combined with the dust removal device 4, it can ensure that the entire device has no obvious dust, meet environmental protection requirements, ensure the health and safety of workers, and avoid mixing fine powder and dust into the machine-made sand 6, thereby ensuring the quality of the finished product.

[0065] The wind classification sand making method provides a complete and orderly sand making process, from raw material transportation, wind classification, coarse particle crushing to the formation of machine-made sand 6, each step is closely linked and interlocked. Operators can operate according to this method to carry out machine-made sand 6 production in an orderly manner, improve production efficiency, reduce quality problems and production interruptions caused by unclear operation procedures, ensure the stable supply of machine-made sand 6, and meet the needs of the construction market.

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

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0068] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0069] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A wind-powered classification sand making device, characterized in that: It includes a raw material warehouse, a material air selection and classification system, an oversize material crushing system, a dust removal device and a stone powder warehouse. The material air selection and classification system includes a primary wind sand selection system and a secondary wind sand selection system; The raw material warehouse conveys materials to the material air separation and grading system, the first-level wind sand selection system selects micro powder, first fine particles and first coarse particles by air, and the second-level wind sand selection system selects micro powder, second fine particles and second coarse particles by air; the first fine particles are mixed with the second fine particles to form machine-made sand, the first coarse particles and the second coarse particles are input to the oversize material crushing system for crushing to form crushed materials, and the crushed materials are input to the material air separation and grading system for further air separation.

2. The wind-powered classification sand making device according to claim 1, characterized in that: The materials in the raw material warehouse are used as raw materials for the primary wind sand selection system and are transported to the primary wind sand selection system for primary wind selection; the input end of the secondary wind sand selection system is connected to the output end of the oversize material crushing system, and the crushed material is used as raw materials for the secondary wind sand selection system and is transported to the secondary wind sand selection system for secondary wind selection.

3. The wind-powered classification sand making device according to claim 1, characterized in that: The particle size of the micro powder is less than 0.075 mm, the particle size of the first fine particles is between 0.075 mm and 2 mm, and the particle size of the first coarse particles is greater than 2 mm.

4. The wind-powered classification sand making device according to claim 1, characterized in that: The particle size of the second fine particles is 0.075 mm to 4.75 mm, and the particle size of the second coarse particles is greater than 4.75 mm.

5. The wind-powered classification sand making device according to claim 1, characterized in that: The oversize material crushing system comprises a crusher, and the crusher is a rolling sand making machine.

6. The wind-powered classification sand making device according to claim 1, characterized in that: An inertial vibrating feeder is arranged at the bottom of the raw material warehouse, and the inertial vibrating feeder evenly transports the materials to the material air selection and grading system.

7. A method for making sand by wind classification, implemented by the wind classification sand making device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Transport raw materials to the material air separation and grading system through the raw material warehouse; Step 2: The first-level wind sand separation system separates the fine powder, the first fine particles and the first coarse particles by wind, and the second-level wind sand separation system separates the fine powder, the second fine particles and the second coarse particles by wind; Step 3: The first fine particles and the second fine particles are mixed to form the first fine particles and the second fine particles are mixed to form machine-made sand; Step 4: The first coarse particles and the second coarse particles are transported to an oversize material crushing system for crushing to form crushed materials; Step 5: The crushed material is transported to the material air separation and grading system for further air separation.

8. The wind-powered classification sand making method according to claim 7, characterized in that: The material is transported to the primary wind sand separation system, and the crushed material is used as the raw material of the secondary wind sand separation system and is transported to the secondary wind sand separation system for secondary wind separation.

9. The wind-powered classification sand making method according to claim 7, characterized in that: The dust removal device is used to remove dust from the material air selection and classification system and the oversize material crushing system.

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