Sand making system

Abstract

The invention relates to the technical field of sand making, in particular to a sand making system which comprises a vertical flour mill, a V-shaped powder concentrator, an efficient powder concentrator, a hot air device, a collecting device and a first stock bin used for storing stone powder. The hot air device comprises a first air path system and a second air path system; one end of the first air path system communicates with a heat source, the other end of the first air path system communicates with the outside, and the vertical pulverizer, the V-shaped powder concentrator, the efficient powder concentrator and the collecting device are connected into the first air path system; two ends of the second air path system are respectively communicated with the first air path system, the second air path system is connected with the vertical flour mill in parallel, and a control valve is arranged on the second air path system. And by designing a semi-cycle process and a full-outer-cycle process, flexible switching is performed according to materials with different characteristics, and the adaptability to raw materials is greatly improved. And meanwhile, the vertical pulverizer is adopted, the grinding efficiency is greatly improved, the materials can be crushed under the action of relatively mild shearing force, and different from traditional impact type crushing, the morphology of finished product particles is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sand making, and in particular to a sand making system. Background Art

[0002] Traditional sand making processes are generally divided into semi-dry sand making process and dry sand making process. The dry sand making process means that water is not used for cooling or cleaning during sand making, but relies on the principle of aerodynamics to carry out processes such as material crushing, classification, and dust removal. The semi-dry sand making process is between the dry sand making process and the wet sand making process. Appropriate moisture can be added before screening to suppress dust, and it is kept dry as much as possible in the final finished product stage.

[0003] In the above two sand making processes, the semi-dry sand making process needs to strictly control the moisture content of raw materials, and a water treatment unit needs to be added. The process flow is complex and the overall production efficiency is low. In the dry sand making process, a large amount of dust is generated during production, which affects the working environment and is difficult to manage. Moreover, the above two processes mostly use vertical shaft crushing sand making machines, and their crushing efficiency is low.

[0004] In view of this, the present invention provides a sand making system with high production efficiency and strong applicability. Summary of the Invention

[0005] The present invention provides a sand making system with high production efficiency and strong applicability.

[0006] To achieve the above object, a sand making system provided by the present invention includes: a vertical mill, a V-type classifier, a high-efficiency classifier, a hot air device, a collection device, and a first bin for storing stone powder;

[0007] The vertical mill has a discharge port; the V-type classifier has a first fine particle outlet; the high-efficiency classifier has a second fine particle outlet;

[0008] The discharge port is communicated with the feeding end of the V-type classifier; the first fine particle outlet is communicated with the feeding end of the high-efficiency classifier; the second fine particle outlet is communicated with the first bin through the collection device;

[0009] The hot air device includes a first air duct system and a second air duct system;

[0010] One end of the first air duct system is communicated with a heat source, and the other end is communicated with the outside. The vertical mill, the V-type classifier, the high-efficiency classifier, and the collection device are respectively connected to the first air duct system; both ends of the second air duct system are respectively communicated with the first air duct system, and the second air duct system is in parallel with the vertical mill, and a control valve is provided on the second air duct system.

[0011] Further, the sand making system further includes a first screening device and a second bin for storing manufactured sand;

[0012] The V-type powder separator further has a first coarse particle outlet; the first screening device has an oversize material outlet and an undersize material outlet;

[0013] A first three-way valve is provided at the first coarse particle outlet, and the two outlets of the first three-way valve are respectively communicated with the feeding end of the first screening device and the feeding end of the vertical mill; the oversize material outlet is communicated with the feeding end of the vertical mill, and the undersize material outlet is communicated with the second bin.

[0014] Further, the first screening device includes at least two layers of sieves arranged at intervals.

[0015] Further, the sand making system further includes a second screening device and a third bin for storing sand for tile adhesive;

[0016] A second three-way valve is provided at the undersize material outlet;

[0017] The second screening device has a return material outlet and a product outlet;

[0018] The two outlets of the second three-way valve are respectively communicated with the feeding end of the second screening device and the feeding end of the vertical mill; the return material outlet is communicated with the feeding end of the vertical mill, and the product outlet is communicated with the third bin.

[0019] Further, the high-efficiency powder separator further has a medium-coarse particle outlet and a second coarse particle outlet;

[0020] The second coarse particle outlet is communicated with the feeding end of the vertical mill; a third three-way valve is provided at the medium-coarse particle outlet, and the two outlets of the third three-way valve are respectively communicated with the feeding end of the vertical mill and the feeding end of the second screening device.

[0021] Further, the heat source comes from the tail kiln, or the heat source comes from a combustion furnace.

[0022] Further, the sand making system further includes a feeding belt; both ends of the feeding belt are respectively located at the material source and the feeding end of the vertical mill;

[0023] The outlet of the first three-way valve communicated with the feeding end of the vertical mill, the oversize material outlet, the outlet of the second three-way valve communicated with the feeding end of the vertical mill, the return material outlet, the second coarse particle outlet, and the outlet of the third three-way valve communicated with the feeding end of the vertical mill are all located above the feeding belt.

[0024] Further, the sand making system further includes a magnetic separator; the magnetic separator is arranged at the feeding belt, and along the conveying direction of the feeding belt, the magnetic separator is arranged downstream of the outlet where the first three-way valve communicates with the feeding end of the vertical mill, the oversize material outlet, the outlet where the second three-way valve communicates with the feeding end of the vertical mill, the return material outlet, the second coarse particle outlet, and the outlet where the third three-way valve communicates with the feeding end of the vertical mill.

[0025] Further, the hot air device further includes a dust collector; the dust collector is arranged at the end of the first air path system.

[0026] Further, the sand making system has a semi-external circulation mode and a full-external circulation mode;

[0027] When the sand making system is in the full-external circulation mode, the opening degree of the control valve is 100%;

[0028] When the sand making system is in the semi-external circulation mode, the opening degree of the control valve is greater than 0 and less than 100%.

[0029] Advantages of the present invention:

[0030] A sand making system provided by the present invention includes: a vertical mill, a V-type classifier, a high-efficiency classifier, a hot air device, a collection device, and a first bin for storing stone powder; the vertical mill has a discharge port; the V-type classifier has a first fine particle outlet; the high-efficiency classifier has a second fine particle outlet; the discharge port communicates with the feeding end of the V-type classifier; the first fine particle outlet communicates with the feeding end of the high-efficiency classifier; the second fine particle outlet is communicated with the first bin through the collection device; the hot air device includes a first air path system and a second air path system; one end of the first air path system is communicated with a heat source, and the other end is communicated with the outside, and the vertical mill, the V-type classifier, the high-efficiency classifier, and the collection device are respectively connected to the first air path system; both ends of the second air path system are respectively communicated with the first air path system, and the second air path system is connected in parallel with the vertical mill, and a control valve is arranged on the second air path system.

[0031] By designing two processes of semi-circulation and full-external circulation, flexible switching is carried out for materials with different characteristics, greatly improving the adaptability to raw materials and breaking through the limitations of the existing sand making process system. At the same time, a vertical mill is adopted, and the working mode of grinding instead of traditional crushing equipment is used. With the unique crushing force of the rotating grinding table and the rolling of the grinding roller, a qualitative leap in grinding efficiency is achieved, which is an innovation in the crushing link of the sand making system. The material can be broken under the action of relatively mild shear force, which is different from traditional impact crushing, fundamentally changing the force mode of material crushing and improving the morphology of the finished product particles. Brief Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a process diagram of the sand making system provided by an embodiment of the present invention.

[0034] Reference Signs: 1 - Vertical Mill; 11 - Discharge Port; 2 - V-Type Powder Separator; 21 - First Fine Particle Outlet; 22 - First Coarse Particle Outlet; 3 - High-Efficiency Powder Separator; 31 - Second Fine Particle Outlet; 32 - Medium Coarse Particle Outlet; 33 - Second Coarse Particle Outlet; 4 - Collection Device; 51 - First Silo; 52 - Second Silo; 53 - Third Silo; 6 - First Screening Device; 61 - Oversize Material Outlet; 62 - Undersize Material Outlet; 7 - Second Screening Device; 71 - Product Outlet; 72 - Return Material Outlet; 81 - Feeding Belt; 82 - Iron Removal Device; 91 - First Air Duct; 92 - Second Air Duct; 93 - Third Air Duct; 94 - Fourth Air Duct; 95 - Fifth Air Duct; 96 - Control Valve; 101 - First Three-Way Valve; 102 - Second Three-Way Valve; 103 - Third Three-Way Valve. Detailed Description of the Embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0037] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. These are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0039] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0042] As Figure 1 shown, an embodiment of the present invention provides a sand making system, including: a vertical mill 1, a V-type powder separator 2, a high-efficiency powder separator 3, a hot air device, a collection device 4, and a first bin 51 for storing stone powder; the vertical mill 1 has a discharge port 11; the V-type powder separator 2 has a first fine particle outlet 21; the high-efficiency powder separator 3 has a second fine particle outlet 31; the discharge port 11 is communicated with the feeding end of the V-type powder separator 2; the first fine particle outlet 21 is communicated with the feeding end of the high-efficiency powder separator 3; the second fine particle outlet 31 is communicated with the first bin 51 through the collection device 4; the hot air device includes a first air path system and a second air path system; one end of the first air path system is communicated with a heat source, and the other end is communicated with the outside, and the vertical mill 1, the V-type powder separator 2, the high-efficiency powder separator 3, and the collection device 4 are respectively connected to the first air path system; both ends of the second air path system are respectively communicated with the first air path system, and the second air path system is connected in parallel with the vertical mill 1, and a control valve 96 is provided on the second air path system.

[0043] When the sand making system provided by the embodiment of the present invention is in production, the raw materials conveyed upstream enter the vertical mill 1 through the feeding end of the vertical mill 1. After being crushed by the vertical mill 1, the raw materials are discharged from the discharge port 11 of the vertical mill 1 and conveyed to the V-type classifier 2 by the first elevator; after the materials discharged from the vertical mill 1 are classified by the V-type classifier 2, the fine powder selected by the V-type classifier 2 is discharged from the first fine particle outlet 21 and enters the high-efficiency classifier 3; after the fine powder selected by the V-type classifier 2 is processed by the high-efficiency classifier 3, the fine powder selected by the high-efficiency classifier 3 is discharged from the second fine particle outlet 31 of the high-efficiency classifier 3 to the collection device 4; the collection device 4 is a cyclone, and the fine powder selected by the high-efficiency classifier 3 is collected by the collection device 4 and then conveyed to the first bin 51 for storage.

[0044] Further, the hot air device provides heat for the sand making system. The hot air device includes a first air path system and a second air path system. The first air path system includes a first air duct 91, a second air duct 92, a third air duct 93 and a fourth air duct 94. One end of the first air duct 91 is connected to the heat source, and the other end is connected to the vertical mill 1; one end of the second air duct 92 is connected to the vertical mill 1, and the other end is connected to the V-type classifier 2; one end of the third air duct 93 is connected to the V-type classifier 2, and the other end is connected to the high-efficiency classifier 3; one end of the fourth air duct 94 is connected to the high-efficiency classifier 3, and the other end is connected to the collection device 4. The second air path system includes a fifth air duct 95. Both ends of the fifth air duct 95 are respectively connected to the first air duct 91 and the second air duct 92 and are in parallel with the vertical mill 1; a control valve 96 for controlling the opening degree of the fifth air duct 95 is provided on the fifth air duct 95. When the sand making system is making sand, by controlling the opening degree of the control valve 96, the ratio of the hot air of the heat source entering the vertical mill 1 and the V-type classifier 2 can be controlled, and the semi-external circulation production mode and the full-external circulation production mode can be realized.

[0045] Optionally, in this embodiment, the hot air of the above heat source can be from the tail kiln or from the combustion furnace, and can be specifically selected according to the actual situation.

[0046] The sand making system provided by this embodiment, through the design of two processes of semi-circulation and full-external circulation, can be flexibly switched for different characteristic materials, greatly improving the adaptability to raw materials and breaking through the limitations of the existing sand making process system. At the same time, the vertical mill 1 is adopted. By replacing the traditional crushing equipment with the working mode of grinding with crushing, and using the unique crushing force of the rotation of the grinding table and the rolling of the grinding roller, a qualitative leap in grinding efficiency is realized, which is an innovation in the crushing link of the sand making system. The material can be broken under the action of relatively gentle shear force, which is different from the traditional impact crushing, fundamentally changing the force mode of material crushing and improving the morphology of the finished product particles.

[0047] Optionally, as Figure 1As shown, the sand making system further includes a first screening device 6 and a second bin 52 for storing manufactured sand; the V-type powder separator 2 further has a first coarse particle outlet 22; the first screening device 6 has an oversize material outlet 61 and an undersize material outlet 62; a first three-way valve 101 is provided at the first coarse particle outlet 22, and the two outlets of the first three-way valve 101 are respectively communicated with the feeding end of the first screening device 6 and the feeding end of the vertical mill 1; the oversize material outlet 61 is communicated with the feeding end of the vertical mill 1, and the undersize material outlet 62 is communicated with the second bin 52.

[0048] In this embodiment, the above-mentioned sand making system can also produce manufactured sand, which is also called construction sand. The V-type powder separator 2 has a first coarse particle outlet 22. After the material discharged from the vertical mill 1 is separated by the V-type powder separator 2, the coarse powder selected by the V-type powder separator 2 is discharged from the first coarse particle outlet 22; a first three-way valve 101 is provided at the first coarse particle outlet 22. The coarse powder selected by the V-type powder separator 2 enters the first three-way valve 101 and is selectively fed into the first screening device 6 and the vertical mill 1 through the first three-way valve 101. The amount of the coarse powder selected by the V-type powder separator 2 entering the first screening device 6 and the vertical mill 1 can be realized by controlling the opening degree of the first three-way valve 101. After the coarse powder selected by the V-type powder separator 2 enters the first screening device 6 and is screened by the first screening device 6, the oversize material of the first screening device 6 returns to the vertical mill 1 through the oversize material outlet 61, and the undersize material of the first screening device 6 enters the second bin 52 as manufactured sand through the undersize material outlet 62 for storage.

[0049] Preferably, the above-mentioned first screening device 6 is a vibrating screen, which includes two layers of screen meshes arranged at intervals up and down. The upper layer of screen mesh can screen out large particle materials and play a certain protective role for the lower layer of screen mesh. The undersize material of the above-mentioned first screening device 6 is the undersize material of the lower layer of screen mesh, and the oversize material is the oversize material of the upper layer of screen mesh and the oversize material of the lower layer of screen mesh.

[0050] Optionally, as Figure 1 As shown, the sand making system further includes a second screening device 7 and a third bin 53 for storing sand for tile adhesive; a second three-way valve 102 is provided at the undersize material outlet 62; the second screening device 7 has a return material outlet 72 and a product outlet 71; the two outlets of the second three-way valve 102 are respectively communicated with the feeding end of the second screening device 7 and the feeding end of the vertical mill 1; the return material outlet 72 is communicated with the feeding end of the vertical mill 1, and the product outlet 71 is communicated with the third bin 53.

[0051] In this embodiment, the above sand making system can also produce sand for tile adhesive; a second three-way valve 102 is further provided at the undersize material outlet 62 of the first screening device 6. Under the action of the second three-way valve 102, the undersize material of the first screening device 6 can selectively enter the second screening device 7 and the second bin 52, so as to separate part of the finished manufactured sand for producing sand for tile adhesive, which can be specifically achieved by controlling the opening degree of the second three-way valve 102; the undersize material of the first screening device 6 enters the second screening device 7. The second screening device 7 is an arc screen. After further screening by the second screening device 7, the oversize coarse powder and undersize fine powder of the second screening device 7 are discharged through the return material outlet 72 and returned to the vertical mill 1, and the finished product between the screens of the second screening device 7 is discharged through the product outlet 71 and enters the third bin 53.

[0052] Optionally, as Figure 1 shown, the high-efficiency powder separator 3 also has a medium-coarse particle outlet 32 and a second coarse particle outlet 33; the second coarse particle outlet 33 is communicated with the feeding end of the vertical mill 1; a third three-way valve 103 is provided at the medium-coarse particle outlet 32, and the two outlets of the third three-way valve 103 are respectively communicated with the feeding end of the vertical mill 1 and the feeding end of the second screening device 7.

[0053] In this embodiment, after the material discharged from the vertical mill 1 is separated by the V-type powder separator 2, the fine powder selected by the V-type powder separator 2 enters the high-efficiency powder separator 3. The high-efficiency powder separator 3 further processes the fine powder selected by the V-type powder separator 2 to obtain fine powder, medium-coarse powder and coarse powder with gradually increasing particle sizes; the coarse powder selected by the high-efficiency powder separator 3 is discharged from the second coarse particle outlet 33 and returned to the vertical mill 1; the medium-coarse powder selected by the high-efficiency powder separator 3 is discharged from the medium-coarse particle outlet 32. A third three-way valve 103 is provided at the medium-coarse particle outlet 32. Under the action of the third three-way valve 103, the medium-coarse powder selected by the high-efficiency powder separator 3 can be selectively transported to the second screening device 7 for producing sand for tile adhesive or returned together with the coarse powder selected by the high-efficiency powder separator 3 and returned to the vertical mill 1; the medium-coarse powder selected by the high-efficiency powder separator 3 enters the second screening device 7. After being screened by the second screening device 7, the oversize coarse powder and undersize fine powder of the second screening device 7 are discharged through the return material outlet 72 and returned to the vertical mill 1, and the finished product between the screens of the second screening device 7 is discharged through the product outlet 71 and enters the third bin 53.

[0054] Optionally, in this embodiment, as Figure 1As shown in the figure, the sand making system further includes a feeding belt 81; both ends of the feeding belt 81 are respectively located at the material source and the feeding end of the vertical mill 1. The materials from the material source are transported to the vertical mill 1 through the feeding belt 81. The feeding belt 81 has a simple structure, is easy to use, and has a weighing function, and can accurately obtain the amount of materials entering the vertical mill 1; the outlets of the first three-way valve 101 communicating with the feeding end of the vertical mill 1, the oversize material outlet 61, the outlets of the second three-way valve 102 communicating with the feeding end of the vertical mill 1, the return material outlet 72, the second coarse particle outlet 33, and the outlets of the third three-way valve 103 communicating with the feeding end of the vertical mill 1 are all located above the feeding belt 81, so that no other auxiliary conveying structures need to be arranged.

[0055] Optionally, as Figure 1 shown in the figure, the sand making system further includes a de-ironing device 82; the de-ironing device 82 is arranged at the feeding belt 81 and along the conveying direction of the feeding belt 81, and the de-ironing device 82 is arranged downstream of the outlets of the first three-way valve 101 communicating with the feeding end of the vertical mill 1, the oversize material outlet 61, the outlets of the second three-way valve 102 communicating with the feeding end of the vertical mill 1, the return material outlet 72, the second coarse particle outlet 33, and the outlets of the third three-way valve 103 communicating with the feeding end of the vertical mill 1, so as to prevent the materials entering the vertical mill 1 from containing iron impurities and affecting the normal operation of the vertical mill 1.

[0056] Optionally, in this embodiment, the above heat source can be from the tail kiln or from the combustion rate.

[0057] The sand making system provided by the embodiments of the present invention can be flexibly externally connected to a combustion furnace according to the actual conditions of the production base, and use the stable and controllable high-temperature hot gas of the combustion furnace to provide sufficient heat for the sand making system; or draw hot air from the kiln tail to achieve efficient recovery and utilization of waste heat and reduce energy consumption. Other external heat sources can also be connected, greatly broadening the range of heat source selection. By controlling the heat source input, the sand making system can achieve precise temperature control to ensure sufficient drying of the materials during the production process. For the semi-external circulation mode, it is applicable to materials with characteristics such as high moisture content, large block size (exceeding 90 mm), poor gradation, high viscosity coefficient, and poor grindability. The semi-circulation process has remarkable effects; in this mode, by introducing hot air into the vertical mill 1, the hot air contacts the materials in the vertical mill 1 and quickly removes the moisture in the materials to achieve pre-drying of the materials. This not only effectively avoids problems such as blockage in the vertical mill 1 and reduced grinding efficiency caused by excessive material moisture, but also enables the materials to maintain a good physical state during the subsequent grinding process, improves the powder selection efficiency, ensures stable operation of the grinding condition, and lays a foundation for high-quality sand making. For the full-external circulation mode, when dealing with materials with low moisture content and good material gradation, the full-external circulation process can exert its unique advantages. Since the sand making system does not pass hot air and there is only a slight negative pressure in the vertical mill 1, the resistance of the sand making system is reduced, unnecessary energy consumption losses are reduced, and the production efficiency is improved.

[0058] Moreover, the present invention adopts the vertical mill 1 to achieve an efficient working mode of grinding with crushing; during the operation of the vertical mill 1, through the rotation of the grinding table and the rolling of the grinding rollers, a strong crushing force is applied to the materials, and the grinding efficiency is high; and the vertical mill 1 can well improve the particle morphology, make the finished product particle size more uniform and round, and has higher application value.

[0059] In the sand making system provided by the embodiments of the present invention, through the cooperation of the first screening device 6 and the second screening device 7, a set of precise screening and powder selection system is constructed, enabling the materials to be separated into various sizes of manufactured sand and ultrafine powder. In the finished product particle size distribution range, the distribution of various particle sizes is relatively balanced, meeting the requirements of different industries for sand and gravel with different particle sizes.

[0060] In an optional working condition, the sand making system provided by the embodiment of the present invention produces sand for tile adhesive, machine-made sand and stone powder in a semi-external circulation mode. Specifically, the raw materials are weighed in the raw material warehouse and transported by the feeding belt 81. After being de-ironed by the iron removal device 82, they enter the vertical mill 1 from the feeding end of the vertical mill 1 for processing; the raw materials are ground by the vertical mill 1, and the materials discharged from the vertical mill 1 are lifted by the first elevator and enter the V-type classifier 2 from the feeding end of the V-type classifier 2; after the materials discharged from the vertical mill 1 are processed by the V-type classifier 2, the V-type classifier 2 obtains fine powder and coarse powder; the coarse powder obtained by the V-type classifier 2 enters the first vibrating screen and the feeding belt 81 respectively through the first three-way valve 101 (the opening degree of the first three-way valve 101 is 50%). The sieve holes of the upper layer of the first vibrating screen are 10 mm, and the upper layer of the sieve screen separates the large particles in the coarse powder obtained by the V-type classifier 2 to protect the lower layer of the sieve screen. The size of the sieve holes of the lower layer of the sieve screen is 6 mm; the materials on the sieve of the first screening device 6 are discharged to the feeding belt 81 through the sieve material outlet 61, and the materials under the sieve of the first screening device 6 all enter the second bin 52 through the second three-way valve 102 (the opening degree of the second three-way valve 102 is 100%); the fine powder obtained by the V-type classifier 2 enters the high-efficiency classifier 3, and after being further processed by the high-efficiency classifier 3, fine powder, medium-coarse powder and coarse powder are obtained; the fine powder obtained by the high-efficiency classifier 3 is collected by the cyclone and enters the first bin 51 through the chute; the coarse powder obtained by the high-efficiency classifier 3 enters the feeding belt 81 through the chute and returns to the vertical mill 1; the medium-coarse powder obtained by the high-efficiency classifier 3 passes through the third three-way valve 103 (the opening degree of the third three-way valve 103 is 100%), and then all enters the second screening device 7 through the belt and the second elevator; after the medium-coarse powder obtained by the high-efficiency classifier 3 is processed by the second screening device 7, the finished product between the sieves of the second screening device 7 enters the third bin 53 through the product outlet 71, and the coarse powder on the sieve and the fine powder under the sieve enter the feeding belt 81 through the return material outlet 72 to return to the vertical mill 1; the second screening device 7 is an arc screen, which has three specification sieves, namely 0.15 mm, 0.3 mm and 0.6 mm, and the parts with particle size greater than 0.6 and particle size less than 0.15 return to the vertical mill 1.

[0061] In this working condition, the operation mode of the hot air device is as follows: the opening degree of the control valve 96 is 50%. Part of the hot air enters the vertical mill 1 through the first air duct 91, and part enters the fifth air duct 95, and is collected with the hot air leaving the vertical mill 1 in the second air duct 92 and enters the V-type classifier 2 together to realize heat exchange with the materials inside the V-type classifier 2 and dry the materials in the V-type classifier 2; the hot air carries the fine powder obtained by the V-type classifier 2 and enters the high-efficiency classifier 3 through the third air duct 93 for further processing; the hot air carries the fine powder obtained by the high-efficiency classifier 3 and enters the cyclone through the fourth air duct 94. Finally, the hot air leaves the cyclone and is discharged to the atmosphere through the dust collector.

[0062] In another alternative operating condition, the sand making system produces machine-made sand and stone powder in a full external circulation mode. Specifically, the raw materials are weighed in the raw material warehouse and then transported by the feeding belt 81. After being de-ironed by the iron removal device 82, they enter the vertical mill 1 from the feeding end of the vertical mill 1 for processing. The raw materials are ground by the vertical mill 1, and the materials discharged from the vertical mill 1 are lifted by the first elevator and then enter the V-type classifier 2 from the feeding end of the V-type classifier 2. After the materials discharged from the vertical mill 1 are processed by the V-type classifier 2, the V-type classifier 2 obtains fine powder and coarse powder. The coarse powder obtained by the V-type classifier 2 enters the first vibrating screen and the feeding belt 81 respectively through the first three-way valve 101 (the opening degree of the first three-way valve 101 is 50%). The screen holes of the upper layer of the first vibrating screen are 10 mm, and the upper layer of the screen separates the large particles in the coarse powder obtained by the V-type classifier 2 to protect the lower layer of the screen. The size of the screen holes of the lower layer of the screen is 6 mm. The oversize materials of the first screening device 6 are discharged to the feeding belt 81 from the oversize material outlet 61, and the undersize materials of the first screening device 6 all enter the second bin 52 through the second three-way valve 102 (the opening degree of the second three-way valve 102 is 100%). The fine powder obtained by the V-type classifier 2 enters the high-efficiency classifier 3, and after being further processed by the high-efficiency classifier 3, fine powder, medium-coarse powder and coarse powder are obtained. The fine powder obtained by the high-efficiency classifier 3 is collected by the cyclone and then enters the first bin 51 through the chute. The coarse powder obtained by the high-efficiency classifier 3 enters the feeding belt 81 through the chute and returns to the vertical mill 1. The medium-coarse powder obtained by the high-efficiency classifier 3 all converges with the coarse powder obtained by the high-efficiency classifier 3 and enters the feeding belt 81 through the third three-way valve 103 (the opening degree of the second three-way valve 102 is 0).

[0063] Under this operating condition, the operating mode of the hot air device is as follows: the opening degree of the control valve 96 is 100%, and all the hot air enters the V-type classifier 2 through the first air duct 91 and the fifth air duct 95, and heat exchange is realized with the materials inside the V-type classifier 2 to dry the materials inside the V-type classifier 2. The hot air carries the fine powder obtained by the V-type classifier 2 and enters the high-efficiency classifier 3 through the third air duct 93 for further processing. The hot air carries the fine powder obtained by the high-efficiency classifier 3 and enters the cyclone through the fourth air duct 94. Finally, the hot air leaves the cyclone and is discharged to the atmosphere through the dust collector.

[0064] In the third optional working condition, the upper-layer stone powder in the semi-outward circulation mode of the sand-making system. Specifically, the raw materials are weighed in the raw material warehouse and transported by the feeding belt 81, and after being de-ironed by the iron-removing device 82, they enter the vertical mill 1 from the feeding end of the vertical mill 1 for processing; the raw materials are ground by the vertical mill 1, and the materials discharged from the vertical mill 1 are lifted by the first elevator and enter the V-type classifier 2 from the feeding end of the V-type classifier 2; after the materials discharged from the vertical mill 1 are processed by the V-type classifier 2, the V-type classifier 2 obtains fine powder and coarse powder; all the coarse powder obtained by the V-type classifier 2 enters the feeding belt 81 through the first three-way valve 101 (the opening degree of the first three-way valve 101 is 0). The fine powder obtained by the V-type classifier 2 enters the high-efficiency classifier 3, and after further processing by the high-efficiency classifier 3, fine powder, medium-coarse powder and coarse powder are obtained; the fine powder obtained by the high-efficiency classifier 3 is collected by the cyclone and then enters the first bin 51 through the chute; the coarse powder obtained by the high-efficiency classifier 3 enters the feeding belt 81 through the chute and returns to the vertical mill 1; the medium-coarse powder obtained by the high-efficiency classifier 3 passes through the third three-way valve 103 (the opening degree of the third three-way valve 103 is 0) and all converges with the coarse powder obtained by the high-efficiency classifier 3 and enters the feeding belt 81.

[0065] In this working condition, the operation mode of the hot air device is as follows: 80% of the hot air from the heat source enters the vertical mill 1 (the compound of the vertical mill 1 for producing stone powder is relatively large), 20% enters the V-type classifier 2 through the fifth air duct 95, the hot air discharged from the vertical mill 1 and the hot air in the fifth air duct 95 are aggregated in the second air duct 92 and enter the V-type classifier 2 together, and heat exchange is realized with the materials inside the V-type classifier 2 to dry the materials inside the V-type classifier 2; the hot air carries the fine powder obtained by the V-type classifier 2 and enters the high-efficiency classifier 3 through the third air duct 93 for further processing; the hot air carries the fine powder obtained by the high-efficiency classifier 3 and enters the cyclone through the fourth air duct 94. Finally, the hot air leaves the cyclone and is discharged to the atmosphere through the dust collector.

[0066] Optionally, in this embodiment, a cold air valve communicating with the outside is further provided on the first air duct 91. The cold air valve is located upstream of the connection between the first air duct 91 and the fifth air duct 95, and the opening degree of the cold air valve can affect the temperature of the hot air.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sand making system, characterized in that, The sand making system includes: a vertical mill (1), a V-type classifier (2), a high-efficiency classifier (3), a hot air device, a collecting device (4), and a first bin (51) for storing stone powder; The vertical mill (1) has a discharge port (11); the V-type classifier (2) has a first fine particle outlet (21); the high-efficiency classifier (3) has a second fine particle outlet (31); The discharge port (11) is communicated with the feeding end of the V-type classifier (2); the first fine particle outlet (21) is communicated with the feeding end of the high-efficiency classifier (3); the second fine particle outlet (31) is communicated with the first bin (51) through the collecting device (4); The hot air device includes a first air duct system and a second air duct system; One end of the first air duct system is communicated with a heat source, and the other end is communicated with the outside. The vertical mill (1), the V-type classifier (2), the high-efficiency classifier (3), and the collecting device (4) are respectively connected to the first air duct system; both ends of the second air duct system are respectively communicated with the first air duct system, and the second air duct system is connected in parallel with the vertical mill (1), and a control valve (96) is provided on the second air duct system.

2. The sand making system according to claim 1, wherein The sand making system further includes a first screening device (6) and a second bin (52) for storing manufactured sand; The V-type classifier (2) further has a first coarse particle outlet (22); the first screening device (6) has an oversize material outlet (61) and an undersize material outlet (62); A first three-way valve (101) is provided at the first coarse particle outlet (22). Two outlets of the first three-way valve (101) are respectively communicated with the feeding end of the first screening device (6) and the feeding end of the vertical mill (1); the oversize material outlet (61) is communicated with the feeding end of the vertical mill (1), and the undersize material outlet (62) is communicated with the second bin (52).

3. The sand making system according to claim 2, wherein, The first screening device (6) includes at least two layers of screening meshes arranged at intervals.

4. The sand making system according to claim 2, characterized in that, The sand making system further includes a second screening device (7) and a third bin (53) for storing sand for tile adhesive; A second three-way valve (102) is provided at the undersize material outlet (62); The second screening device (7) has a return material outlet (72) and a product outlet (71); Two outlets of the second three-way valve (102) are respectively communicated with the feeding end of the second screening device (7) and the feeding end of the vertical mill (1); the return material outlet (72) is communicated with the feeding end of the vertical mill (1), and the product outlet (71) is communicated with the third bin (53).

5. The sand making system according to claim 4, wherein The high-efficiency classifier (3) further has a medium coarse particle outlet (32) and a second coarse particle outlet (33); The second coarse particle outlet (33) is communicated with the feeding end of the vertical mill (1); a third three-way valve (103) is provided at the medium coarse particle outlet (32). Two outlets of the third three-way valve (103) are respectively communicated with the feeding end of the vertical mill (1) and the feeding end of the second screening device (7).

6. The sand making system according to any one of claims 1 to 5, characterized in that, The heat source comes from the tail kiln, or, the heat source comes from the combustion furnace.

7. The sand making system according to claim 5, characterized in that, The sand making system further includes a feeding belt (81); both ends of the feeding belt (81) are respectively located at the material source and the feeding end of the vertical mill (1); The outlet of the first three-way valve (101) communicating with the feeding end of the vertical mill (1), the oversize material outlet (61), the outlet of the second three-way valve (102) communicating with the feeding end of the vertical mill (1), the return material outlet (72), the second coarse particle outlet (33), and the outlet of the third three-way valve (103) communicating with the feeding end of the vertical mill (1) are all located above the feeding belt (81).

8. The sand making system according to claim 7, wherein, The sand making system further includes a de-ironing device (82); the de-ironing device (82) is arranged at the feeding belt (81), and along the conveying direction of the feeding belt (81), the de-ironing device (82) is arranged downstream of the outlet of the first three-way valve (101) communicating with the feeding end of the vertical mill (1), the oversize material outlet (61), the outlet of the second three-way valve (102) communicating with the feeding end of the vertical mill (1), the return material outlet (72), the second coarse particle outlet (33), and the outlet of the third three-way valve (103) communicating with the feeding end of the vertical mill (1).

9. The sand making system according to claim 1, wherein The hot air device further includes a dust collector; the dust collector is arranged at the end of the first air path system.

10. The sand making system according to claim 1, characterized in that, The sand making system has a semi-external circulation mode and a full-external circulation mode; When the sand making system is in the full-external circulation mode, the opening degree of the control valve (96) is 100%; When the sand making system is in the semi-external circulation mode, the opening degree of the control valve (96) is greater than 0 and less than 100%.

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