CN211436519U - Production process system for producing multi-product machine-made sand - Google Patents
Production process system for producing multi-product machine-made sand Download PDFInfo
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Abstract
The utility model discloses a production process system for producing multi-product machine-made sand, which comprises a raw material bin, a machine-made sand vertical mill, a combined type powder concentrator, a vibrating screen, a cyclone cylinder and a circulating fan, wherein the raw material bin, the machine-made sand vertical mill and the combined type powder concentrator are sequentially connected, a discharge port at the bottom of the combined type powder concentrator is connected with the vibrating screen, the vibrating screen returns oversize materials to the machine-made sand vertical mill, an air outlet of the combined type powder concentrator is connected with the cyclone cylinder, and an air outlet of the cyclone cylinder is connected with the circulating fan; a plurality of layers of screens with different apertures are arranged on the vibrating screen; the conical angle of each grinding roller of the machine-made sand vertical mill is not more than 20 degrees, and the total projection area of the grinding rollers on the grinding disc is 20-35% of the area of the grinding disc; the material blocking ring is a through type screening material blocking assembly or a cross type material blocking ring, an auxiliary material discharging assembly is arranged on the grinding disc, and the auxiliary material discharging assembly is located behind each grinding roller along the rotation direction of the grinding disc. The utility model can realize the production of multi-product machine-made sand, and is beneficial to large-scale production; the environment-friendly effect is better, and ultra-clean discharge can be realized.
Description
Technical Field
The utility model belongs to the technical field of immediately, grind system sand, especially relate to a production process systems of production multi-product mechanism sand.
Background
With the continuous development of economy, consciousness of environmental protection is gradually deepened, and concrete is one of materials applied in a large scale in the field of building materials. The sandstone is used as the aggregate of the concrete and plays a role of a framework in the concrete. The aggregate is divided into coarse aggregate and fine aggregate, wherein the coarse aggregate is the aggregate with the particle size of more than 5mm and mainly comprises natural rock or pebble; the fine aggregate is aggregate with the particle size of below 4.75mm, and mainly comprises river sand and machine-made sand. Generally, river sand or machine-made sand with different particle sizes is called fine sand with the particle size of 0.075-1.18 mm, medium sand with the particle size of 1.18-2.36 mm and coarse sand with the particle size of 2.36-4.75 mm. The particle sizes of different sands can meet the requirements of different products, for example, dry-mixed mortar mainly comprises fine sand and medium sand, and common concrete mainly comprises medium sand and coarse sand. The fine aggregate commonly used in the prior common concrete is mainly river sand, but through continuous mining for many years, the natural river sand resource is rapidly reduced. In order to protect the ecological environment, the national regulations strictly prohibit the exploitation of natural river sand. In the concrete field, practical mechanism sand is encouraged vigorously. Therefore, the prosperity of the construction market promotes the rapid development of the machine-made sand market, and the machine-made sand gradually replaces the natural sand market and becomes one of the best sources of construction materials.
The prior machine-made sand production technology mainly adopts equipment such as a jaw crusher, a cone crusher, a ball mill, a double-rotor sand making machine, a vertical shaft type impact crusher and the like as main crushing equipment. Production of mechanism sand is realized through multistage breakage, but jaw breaker, cone crusher rely on the impact to be broken with the granule, and the effort that the granule received is little, and granule selectivity is broken, and the mechanism sand granule circularity of production is relatively poor, mostly is the needle slice. The influence of the gill-rod-shaped content of the aggregate on the strength of the gelled sand gravel (Henan water conservancy and south-to-north water conservancy, 76-7 pages in 6 th of 2018) is researched by Jinxianli, and the research is considered as follows: the needle-shaped sand stone in the concrete is harmful particles, so that the fluidity and the strength of the concrete can be greatly reduced, and the quantity of the needle-shaped sand stone should be reduced to the greatest extent. Therefore, the quality deviation of the products of the jaw crusher and the cone crusher for preparing the machine-made sand is not beneficial to engineering application. The ball mill is used as crushing equipment, the produced machine-made sand particles have good circularity, but the ball mill has the main function of grinding, and a large amount of fine powder (the fine powder refers to powdery particles with the particle size of less than 0.075mm) can be generated in the production process. Liu war ao et al, in the research on harmfulness and evaluation of fine powder in machine-made sand (journal of building materials, 2015, 150-155 p. 2), consider that: the fine powder is also a harmful particle to the machine-made sand, which causes the water requirement of concrete to be increased and the durability to be deteriorated, and the content of the fine powder in the machine-made sand needs to be strictly controlled. In addition, the production energy consumption of the ball mill is very high, and the large-scale and large-scale production is not facilitated. Therefore, the high fine powder content in the product and the high energy consumption of production and operation result in that the sand preparation of the ball mill preparation machine is not popularized and applied in a large area.
The vertical mill is used as an energy-saving and efficient material bed grinding device, is widely applied to cement grinding and metallurgical slag treatment, and adopts the mutual movement of grinding rolls and grinding discs, after particles form a material bed on the grinding discs and are subjected to extrusion force, the particles are crushed by extrusion and shearing force, the materials are repeatedly ground in the rolling process of the grinding discs, the particle roundness is better, and the energy utilization efficiency of the crushing and grinding of the vertical mill is higher than that of the selective crushing of a cone crusher and that of the single particle crushing of a ball mill, so that the vertical mill is widely accepted and applied as grinding equipment for producing fine powder. Chinese patent publication No. CN109277146A discloses a vertical mill sand making machine, which comprises a transmission device, a milling device, a pressurizing device, a limiting device, a feeding device, a lower shell and a discharging device, and the technology can basically realize the production of machine-made sand, but because of adopting the traditional vertical mill structure, the following defects exist:
1. the content of fine powder (less than 0.075mm) in the manufacturing process is too high, so that the sand forming rate is low, the energy consumption is high, the resource waste is caused, and the efficiency is low;
2. the extension of the grinding disc has fine powder accumulation, excessive grinding is caused in an accumulation area, the operation stability of the vertical mill is poor, the reliability of equipment is poor, and the shutdown maintenance frequency is high;
3. in the existing vertical mill, the tire roller is adopted, and an upward arc transition surface exists on a grinding disc of the grinding structure, so that the flowability of materials on the grinding disc is poor;
4. auxiliary discharge is not involved, resulting in too high a fine content in the machine-made sand.
As more efficient and energy-saving grinding equipment, the grinding equipment is feasible in principle when used for producing machine-made sand, but the granularity of a product is increased from less than 0.075mm to less than 4.75mm, the original vertical mill needs to be redesigned, and the problems of high fine powder content, poor product circularity and high production energy consumption of the traditional machine-made sand crushing equipment are solved.
In addition, the prepared machine-made sand has poor sphericity, can not produce multi-product machine-made sand according to requirements (the multi-product machine-made sand refers to a single machine-made sand product with multiple specifications), has poor on-site dust collection effect, is serious in ash emission during production, and does not meet the requirement of green production by adopting a machine-made sand production system of a crusher at present. Therefore, it is urgently needed to develop a novel machine-made sand production process system, improve the product quality of machine-made sand, produce multi-product machine-made sand, improve the environmental protection quality of a machine-made sand production line, and realize green, efficient and large-scale production.
Disclosure of Invention
An object of the utility model is to provide a production process systems of production multi-product machine-made sand adopts this process systems can produce the machine-made sand of multi-product, and can reduce the content of needle slice granule in the product, reduces machine-made sand fine powder content, improves the product quality of machine-made sand, improves system sand energy utilization, reduces the production energy consumption, does benefit to the large-scale production, improves resource utilization.
The utility model discloses a realize like this, a production technology system of production multi-product mechanism sand, including former feed bin, mechanism sand vertical mill, combined type powder concentrator, shale shaker and pollen removal mechanism, pollen removal mechanism includes whirlwind section of thick bamboo and circulating fan, and former feed bin export links to each other with mechanism sand vertical mill material entry, and the material export of mechanism sand vertical mill links to each other with combined type powder concentrator's material entry, and combined type powder concentrator's bottom discharge gate links to each other with the shale shaker, and the shale shaker returns the oversize thing to mechanism sand vertical mill, and combined type powder concentrator's air outlet links to each other with whirlwind section of thick bamboo, and whirlwind section of thick bamboo's air outlet links to each other with circulating fan, circulating fan's export still has set gradually dust collector and tail exhaust fan;
a plurality of layers of screens with different apertures are arranged on the vibrating screen;
the machine-made sand vertical mill comprises a grinding disc, at least two grinding rollers and a material blocking ring, wherein the conical angle of each grinding roller is not more than 20 degrees, and the total projection area of the grinding rollers on the grinding disc is 20-35% of the area of the grinding disc; the material blocking ring is a through type screening material blocking assembly or a crossing type material blocking ring, an auxiliary material discharging assembly is arranged on the grinding disc, and the auxiliary material discharging assembly is located behind each grinding roller along the rotation direction of the grinding disc.
Preferably, the material blocking ring is a through-type screening material blocking assembly, the through-type screening material blocking assembly comprises a material blocking ring and a fastening support piece, the material blocking ring is fixed on the grinding disc through the fastening support piece, and a hollow structure is formed between the material blocking ring and the grinding disc.
Further preferably, the duty cycle of the hollow structure is 1: (0.4-0.7), and the total height of the through type screening material blocking assembly is 2-6% of the diameter of the grinding disc.
Preferably, the material blocking ring is a cross material blocking ring, a plurality of material discharging openings are formed in the upper portion of the cross material blocking ring, the material blocking ring is made to form a concave-convex structure, the total area of the material discharging openings is 40-60% of the total area of the cross material blocking ring, the height of the concave portion of the cross material blocking ring is 55-95% of the height of the convex portion, and the interval between every two adjacent material discharging openings is 100-800 mm.
Preferably, the auxiliary discharge assembly comprises a pneumatic blowing device and/or a mechanical discharge device.
Preferably, the pneumatic injection device is fixed on the vertical mill shell and used for timely discharging fine powder generated after grinding, a nozzle of the pneumatic injection device extends into the upper portion of the grinding disc and faces the material blocking ring side or the grinding disc side, the height of the nozzle of the pneumatic injection device from the surface of the grinding disc is 20-100 mm, and the radial distance of the nozzle from the material blocking ring is 5-80 mm.
Preferably, the mechanical discharging device is a shovel plate which is arranged downwards and slantwise towards the grinding disc and is used for discharging the ground materials in time, one end of the shovel plate is fixed on the vertical mill shell, and the other end of the shovel plate extends to the position above the grinding disc; the shovel plate comprises a material guiding section and a material shoveling section, and the shovel plate is in arc transition at the joint of the material shoveling section and the material guiding section; the distance between the part of the shovel plate above the grinding disc and the grinding roller is 5-30 mm, the distance between the shovel plate and the grinding disc is 5-60 mm, and the distance between the shovel plate and the material retaining ring is 5-80 mm.
Preferably, the combined powder concentrator comprises a sand concentration mechanism and a powder concentration mechanism, and the sand concentration mechanism is positioned below the powder concentration mechanism and connected through an expansion joint;
the sand selecting mechanism comprises an air inlet shell, a sand selecting shell and a sand collecting shell, and the air inlet shell, the sand selecting shell and the sand collecting shell are sequentially connected through flanges; a plurality of air distribution plates are distributed on the air inlet shell from top to bottom on the side close to the sand separation shell, and an air inlet flange port is formed on the side far away from the sand separation shell; the top of the sand separation shell is provided with a feeding port, the bottom of the sand separation shell is provided with a coarse material discharge port, a heavy hammer type air locking valve is arranged at the position of the coarse material discharge port, a plurality of scattering stepped plates are uniformly distributed on the side, close to the air inlet shell, of the sand separation shell from top to bottom, each scattering stepped plate forms a certain included angle with the horizontal line, a plurality of guide stepped plates are uniformly distributed on the side, close to the sand collection shell, of the sand separation shell from top to bottom, the guide stepped plates correspond to the scattering stepped plates one by one, each guide stepped plate forms a certain included angle with the horizontal line, and the inclination direction of the guide; the top of the sand collecting shell is connected with one end of the expansion joint, the bottom of the sand collecting shell is provided with a sand outlet, and a hammer type air locking valve is arranged at the sand outlet;
the powder selecting mechanism comprises a flow guide shell, a powder selecting shell, a powder discharging shell, a driving device, a transmission main shaft and a rotating cage, wherein the flow guide shell, the powder selecting shell and the powder discharging shell are sequentially arranged from bottom to top and are connected through flanges; the driving device is arranged above the powder discharging shell and drives the transmission main shaft to rotate, the transmission main shaft is inserted into the powder discharging shell from top to bottom, the lower part of the transmission main shaft is connected with the rotating cage through a flange, and the rotating cage is arranged in the center of the powder selecting shell; the bottom of the flow guide shell is connected with the other end of the expansion joint, a sand return cone is arranged on the inner side of the flow guide shell, a space is reserved between the sand return cone and the flow guide shell, and a sand return pipe leading to a sand outlet is arranged at the bottom of the sand return cone; a plurality of guide vanes are uniformly distributed around the rotating cage, the tops of the guide vanes are connected with the lower bottom plate of the powder outlet shell, and the bottoms of the guide vanes are connected with the sand return cone; and an air outlet flange opening of the whole equipment is arranged in the middle of the powder outlet shell.
Preferably, the middle lower parts of the air inlet shell and the sand collecting shell are provided with supporting flanges for fixing the sand selecting mechanism on the bracket, and the outer side of the flow guide shell is provided with a plurality of supporting flanges for fixing the powder selecting mechanism on the bracket; the sand return pipe is arranged on the inner wall plate of the sand collecting shell body far away from one side of the sand selecting shell body.
Preferably, a pre-screening device is arranged between the machine-made sand vertical mill and the combined powder concentrator.
The utility model has the advantages of it is following and beneficial effect:
1. the machine-made sand production process system of the utility model can prepare multi-product machine-made sand, has simple flow, convenient operation and maintenance and high equipment intellectualization degree, and is beneficial to large-scale production; the content of needle-shaped particles in the product can be reduced, the content of fine powder of machine-made sand is reduced, the product quality of the machine-made sand is improved, the utilization rate of sand-making energy is improved, the production energy consumption is reduced, large-scale production is facilitated, the resource utilization rate is improved, the performance of concrete is improved, and the engineering quality is facilitated.
2. The machine-made vertical sand mill of the utility model adopts the relative movement of the grinding roller and the grinding disc to crush the particles, the energy efficiency utilization rate is higher than that of the traditional crusher, the energy consumption can be saved by 15-45%, and the machine-made vertical sand mill has obvious energy-saving effect; the machine-made sand adopts a material bed grinding structure, the raw materials are crushed by extrusion and shearing acting forces in a machine-made sand vertical mill, the circularity of the crushed particles is higher than that of the crushed particles due to impact crushing of a crusher, and the finished product particles have fewer needle-shaped particles and are better in quality; the machine-made sand vertical mill is of a totally enclosed structure, operates under micro negative pressure, has no dust leakage in the production process, and has good production environmental protection effect.
3. The material blocking ring of the machine-made sand vertical mill of the utility model enables the content of fine powder of the obtained mill material to be only 10-20%, the content of fine powder is reduced, the large particles which are not milled only 20-30% enter the mill material, the energy consumption of an auxiliary machine is reduced by 5-10%, and the material blocking efficiency of the large particles is improved; and an auxiliary discharging device is additionally used, so that auxiliary discharging can be better performed.
4. The combined powder concentrator of the utility model can simultaneously separate sand and powder from the fed materials, the coarse materials left after separation can return to a machine-made sand vertical mill, the closed cycle of crushing-sand separation is realized, the sand grain shape is improved, the functions of a vibrating screen and a powder removing machine are integrated, the utilization rate of the equipment is improved to the maximum extent, the investment of the equipment is saved, and the power consumption of separation is reduced; the machine-made sand with good gradation is obtained by adjusting the parameters of the sand selecting powder concentrator, such as the concentration of the selected powder, the linear velocity of the rotating cage, the installation angle of the guide vanes and the like.
Drawings
Fig. 1 is a flow chart of a machine-made sand production process system provided in the first embodiment of the present invention;
fig. 2 is a schematic structural view of a through-type screening material blocking assembly according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pneumatic blowing device and a mechanical discharging device according to a first embodiment of the present invention;
fig. 4 is a schematic structural view of a striding type material blocking ring provided by the second embodiment of the present invention;
fig. 5 is a schematic structural view of a combined powder concentrator according to a third embodiment of the present invention;
fig. 6 is a schematic structural view of a rotating cage and guide vanes of the combined powder concentrator provided by the third embodiment of the present invention at a position a-a;
fig. 7 is a flow chart of a machine-made sand production process system provided by the fourth embodiment of the present invention.
In the figure: 100-machine-made sand vertical mill; 110-grinding rolls; 120-grinding disc; 130-through screening stop assemblies; 131-a material blocking ring; 132-a fastening support; 133-a protective sleeve; 134-a cap; 140-crossing material blocking ring; 141-a discharge port; 150-a pneumatic blowing device; 151-a nozzle; 152-a gas delivery pipe; 160-mechanical discharge device; 161-a material guiding section; 162-material shoveling section; 170-vertical mill shell;
200-a raw material bin;
300-combined powder concentrator; 310-a sand selecting mechanism; 311-air intake shell; 312-sand selecting shell; 313-sand collecting shell; 314-weight type airlock valve; 315-breaking up the step plate; 316-a flow guiding stepped plate; 317-air distribution plate; 318-sand return pipe; 320-powder selecting mechanism; 321-a flow guide shell; 322-selecting powder shell; 323-powder discharging shell; 324-a drive device; 325-a transmission main shaft; 326-rotating cage; 327-guide vanes; 328-a lubricating device; 329-sand return cone; 330-an expansion joint;
400-vibrating screen;
500-a pollen removal mechanism; 510-a cyclone; 520-a circulating fan;
600-a dust collector;
700-tail exhaust fan;
800-steady flow storehouse;
900-drum screen.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, the present embodiment provides a production process system for producing multi-product machine-made sand, which includes a raw material bin 200, a machine-made sand vertical mill 100, a combined powder concentrator 300, a vibrating screen 400 and a powder removing mechanism 500, the powder removing mechanism 500 comprises a cyclone cylinder 510 and a circulating fan 520, an outlet of the raw material bin 200 is connected with a material inlet of the machine-made sand vertical mill 100, a material outlet of the machine-made sand vertical mill 100 is connected with a material inlet of the combined type powder concentrator 300 through a hoisting machine, a discharge port at the bottom of the combined type powder concentrator 300 is connected with a vibrating screen 400, the vibrating screen 400 returns oversize materials to the machine-made sand vertical mill 100, an air outlet of the combined type powder concentrator 300 is connected with the cyclone cylinder 510, an air outlet of the cyclone cylinder 510 is connected with the circulating fan 520, the outlet of the circulating fan 520 is also sequentially provided with a dust collector 600 and a tail exhaust fan 700, the vibrating screen 400 is provided with a plurality of layers of screens with different apertures, and the screens are arranged into one or more layers.
The materials are crushed and ground by the machine-made sand vertical mill 100 and enter the screening equipment such as the combined powder concentrator 300 and the vibrating screen 400, and the high-efficiency, low-energy-consumption and clean production of the multi-product machine-made sand is realized.
Raw materials enter the machine-made sand vertical mill 100 from the raw material bin 200 through a conveying belt, and the ground materials are discharged to the machine-made sand vertical mill 100 to enter outsideAnd (2) feeding the materials into the hoister, feeding the materials discharged from the hoister into the combined powder concentrator 300, enabling fine powder with the particle size smaller than 0.075mm to move upwards under the driving action of gas and coarse particles to move downwards under the action of gravity through the combined powder concentrator 300, collecting the fine powder by the cyclone 510 after passing through the combined powder concentrator 300, feeding the fine powder into the next working section, and feeding the materials subjected to powder removal into the vibrating screen 400. The gas carrying fine powder enters the cyclone 510 from the combined powder concentrator 300, the cyclone 510 separates the fine powder from the gas, the fine powder enters the next process, and the gas enters the circulating fan 520; and a part of the gas after passing through the circulating fan 520 returns to enter the combined powder concentrator 300, a part of the gas enters the dust collector 600, is dedusted by the dust collector 600 and then is exhausted to the atmosphere through the tail exhaust fan 700 and a chimney, and powder removal is completed. By adopting a double-fan system consisting of the circulating fan 520 and the tail exhaust fan 700, the on-site dust collection effect is improved, and the dust collector 600 can reduce the dust emission concentration to 5mg/m3And the ultra-clean emission is realized, and the environment protection is facilitated. Meanwhile, the arrangement of the tail exhaust fan 700 is beneficial to the adjustment of the circulating air volume, and particularly when the moisture of the grinding material is more than 2.5%, the finished product has high requirement on the moisture content (for example, machine-made sand for dry powder mortar with the moisture of less than 0.5%), wet air can be discharged, the dewing of the wet air in a system is reduced, and the service life of a pipeline is prolonged. Hot air can be connected in series before separation, the materials ground by the vertical mill are dried, and the whole circulating system is prevented from being influenced by water vapor condensation.
The sand is produced by a vertical mill, and the ground material enters the combined powder concentrator 300 through a lifter. The combined powder concentrator 300 is composed of a dynamic powder concentrator on the upper part and a static sieving machine on the lower part. The fine powder is driven by the airflow to move upwards, and the harmful fine powder is separated under the action of the dynamic powder separator and enters the next working procedure; the coarse particles passing through the combined powder concentrator 300 move downwards under the action of gravity, are discharged from a discharge port at the bottom of the combined powder concentrator 300, enter the vibrating screen 400, and can be screened step by step through the vibrating screen 400, so that the requirements of multiple products are met.
Three discharge ports of the combined powder concentrator 300 are arranged, namely a fine sand outlet, a medium sand and coarse sand outlet and a coarse particle discharge port, and particles with the medium sand fraction of more than 1.18 enter the vibrating screen 400 for secondary separation, the vibrating screen 400 of the embodiment is provided with two layers of screens, the aperture of the upper layer screen of the vibrating screen 400 is 4.75mm, the aperture of the lower layer screen is 2.36mm, and the particles with the size of more than 4.75mm above the upper layer screen return to the mill again for grinding; particles with the diameter of 2.36-4.75 mm are used as coarse sand products; products with the diameter of less than 2.36mm are used as medium sand and fine sand products. The production of machine-made sand products with different grain sizes can be realized, the production efficiency is improved, and the operation cost of enterprises is reduced.
A steady flow bin 800 is also arranged between the raw material bin 200 and the machine-made sand vertical mill 100. The steady flow bin 800 ensures the stability of the materials to be ground, improves the crushing and grinding efficiency of the vertical mill, reduces the fluctuation of the system output, ensures the stable operation of the system, improves the energy utilization rate, reduces the production energy consumption, improves the operation safety of the equipment and reduces the operation failure rate.
Furthermore, the utility model discloses increase the dust arrester installation of auxiliary engine in mechanism sand vertical mill 100, lifting machine and shale shaker 400, this dust arrester installation can adopt the bag type dust collector, and the quantity of dust collector is set for as required, and the smoke and dust with transportation process removes dust through the dust collector, and at the atmosphere of discharging, the dust of detaching returns corresponding belt feeder through the material export, carries along with the system. The cleaning degree of the on-site environment can be improved, dust collection treatment is carried out on conveying and screening equipment containing dust, the cleaning production benefit is improved, and the environment is protected.
The machine-made sand vertical mill 100 comprises a grinding disc 120, at least two grinding rollers 110 and a material stop ring, wherein the conical angle of each grinding roller 110 is not more than 20 degrees, and the total projection area of the grinding rollers 110 on the grinding disc 120 is 20-35% of the area of the grinding disc. The increase of the projection area can increase the yield of the grinding roller for one-time grinding, and the generation amount of fine powder is reduced by matching with the increase of the rotating speed and discharging the ground material out of the grinding machine in time; the machine-made sand vertical mill of the embodiment adopts a rocker arm roll turning structure, and can directly turn the grinding roll out of the mill for maintenance; the grinding roller sleeve is made of surfacing materials, so that online surfacing is convenient to realize. The material blocking ring is a through-type screening material blocking assembly 130 or a cross-type material blocking ring 140, an auxiliary material discharging assembly is arranged on the grinding disc 120, and the auxiliary material discharging assembly is positioned behind each grinding roller along the rotation direction of the grinding disc. The through type screening material blocking assembly or the crossing type material blocking ring is adopted, so that the content of fine powder of the milled material can be reduced, the energy consumption of an auxiliary machine is reduced, and auxiliary material discharge is additionally arranged, so that the content of the fine powder is further reduced.
Preferably, referring to fig. 2, the material blocking ring is a through-type screening material blocking assembly 130, the through-type screening material blocking assembly 130 includes a material blocking ring 131 and a fastening support 132, the material blocking ring 131 is fixed on the grinding disc 120 through the fastening support 132, and a hollow structure is formed between the material blocking ring 131 and the grinding disc 120. The hollow structure of the lower layer ensures that the materials can be discharged in time after being extruded, reduces the excessive grinding of the vertical mill and reduces the generation amount of fine powder; the material blocking ring 131 of the upper solid structure effectively blocks large particles which are not ground, so that the large particles stay on the grinding disc, the large particles are guaranteed to be discharged outside the grinding machine after being ground, and the circulating load of the system and the production energy consumption are reduced.
Further preferably, the duty cycle of the hollow structure is 1: (0.4 to 0.7); adopt in this embodiment the hollow structure height is 30 ~ 200mm, keep off material ring 131 height and be 5 ~ 100mm, the clearance between per two fastening support piece 132 is 20 ~ 600mm for the material that is less than 50mm can both pass through, prevents that the material from excessively grinding. The total height of the through-type screening material blocking assembly 130 is 2-6% of the diameter of the grinding disc 120, and reasonable matching is conducted according to feeding amount. In addition, in this embodiment, a protection sleeve 133 is sleeved outside the fastening support 132 located at the hollow structure, and the protection sleeve 133 supports the material blocking ring 131 of the upper solid structure. The fastening support 132 in this embodiment is made of a bolt, and the cap 134 is sleeved on the bolt head above the material stop ring 131, and the cap 134 and the protection sleeve 133 are sleeved up and down respectively, so as to prevent the fastening support 132 from being worn and damaged due to long-term use, and not easy to screw.
100% of materials of the material blocking ring structure of the original vertical mill pass through the upper part of the material blocking ring, and the content of fine powder of the milled materials reaches 20-30%; and adopt the utility model discloses a through-type screening keeps off material subassembly 130 material 70 ~ 90% and passes through from the lower part hollow portion, goes out and grinds material farine content and only has 10 ~ 20%, and farine content reduces. In addition, in the material blocking ring structure of the original vertical mill, about 35-45% of large particles which are not ground enter the milled materials, so that the system load and the energy consumption are increased; and adopt the utility model discloses a through-type screening keeps off material subassembly 130 structure, the large granule that does not grind only has 20 ~ 30% to enter into out and grinds the material, reduces auxiliary engine energy consumption 5 ~ 10%, hinders material efficiency improvement to the large granule.
Preferably, the auxiliary discharge assembly comprises a pneumatic blowing device 150 and/or a mechanical discharge device 160.
When the auxiliary discharging device combining the pneumatic blowing device 150 and the mechanical discharging device 160 is adopted, the mechanical discharging device 160 has a certain height from the grinding disc 120, so that the upper material is mainly scooped up, the lower fine powder is blown out by the pneumatic blowing device 150, and the combination of the two can better perform auxiliary discharging.
Preferably, referring to fig. 3, the conveying air pipe 152 of the pneumatic blowing device 150 is fixed on the vertical mill housing 170 for discharging the fine powder generated after grinding in time, and the nozzle 151 of the pneumatic blowing device 150 extends above the grinding disc 120 and faces the material stop ring side or the grinding disc 120 side. The compressed air flow rate of the pneumatic injection device 150 is 35-85 m/s, the pneumatic injection device 150 is arranged in the mill, and fine powder generated after grinding is discharged in time, so that the fine powder cannot be ground again, and the amount of the fine powder is reduced. The nozzle 151 of the present embodiment may be a divergent fan nozzle, fine material is blown out in time under the combined action of centrifugal force, and coarse material is left on the grinding disc 120 for further grinding.
The height of the nozzle 151 of the pneumatic blowing device 150 from the surface of the grinding disc 120 is 20-100 mm, the radial distance of the nozzle 151 from the material retaining ring is 5-80 mm, and reasonable matching is carried out according to the feeding amount.
Referring to fig. 3, the mechanical discharging device 160 is a shovel plate disposed obliquely downward toward the grinding disc 120 for discharging the ground material in time, and one end of the shovel plate is fixed on the vertical mill housing 170, and the other end extends to above the grinding disc 120. The mechanical discharging device 160 is arranged in the mill, so that the ground material is discharged in time, the retention time of the ground material in the grinding disc 120 is reduced, the material cannot be ground twice, and the generation amount of fine powder is reduced. The scoops impart a force to the material and the scooped material is thrown out of the grinding disc 120.
The shovel plate comprises a material guiding section 161 and a material shoveling section 162, and the shovel plate is in circular arc transition at the connecting position of the material shoveling section 162 and the material guiding section 161. The shoveling section 162 is used for shoveling the materials and guiding the materials out of the mill through the guiding section 161. The cross section of the shovel plate in this embodiment may be arc-shaped or L-shaped or other shapes.
The distance between the part of the shovel plate above the grinding disc 120 and the grinding roller 110 is 5-30 mm, the distance between the shovel plate and the grinding disc 120 is 5-60 mm, the distance between the shovel plate and the material retaining ring is 5-80 mm, and reasonable matching is carried out according to the feeding amount.
In the process of producing machine-made sand, the main factors influencing the quality of the machine-made sand product are the grinding disc rotating speed of the machine-made sand vertical mill, the centrifugal force of materials on the grinding disc, the grinding pressure and the like.
Wherein, 1) the grinding disc rotating speed of the machine-made sand vertical mill is calculated by adopting the following formula:
wherein: n is the rotation speed of the grinding disc, r/min;
k is an empirical coefficient and is dimensionless, and the value of K is 48-60;
d is the diameter of the grinding disc of the vertical mill, m.
The grinding disc rotating speed of the machine-made sand vertical mill is 1.05-1.35 times of that of the traditional vertical mill, and the grinding disc rotating speed of the traditional vertical mill is 25-35 r/min. The increase of the rotating speed can shorten the retention time of material particles in the grinding disc, reduce the times of grinding the particles and reduce the generation of fine powder.
2) The centrifugal force of the material on the grinding disc is calculated by adopting the following formula:
F＝mV2/R
wherein: f is the centrifugal force on the grinding disc of the material, N;
m is the mass of the particles, kg;
v is the peripheral speed of the grinding disc, m/s;
radius of R-disc, m.
It can be seen that when V is larger, the centrifugal force on the material is larger, the residence time of the grinding disc is shorter, the material can be discharged out of the grinding disc in time after being ground once, and the number and degree of over-grinding of the material are reduced.
3) The grinding pressure of the material is calculated by adopting the following formula:
P＝F×S1÷S2÷k
wherein: p is grinding pressure, MPa;
f is the grinding pressure of the hydraulic cylinder, and N is the grinding pressure of the hydraulic cylinder;
S1is the effective area of the hydraulic oil in the hydraulic cylinder, m2；
S2Is the projected area of a single grinding roller on the grinding disc, m2；
K is the rocker coefficient of the machine-made sand vertical mill, is dimensionless and is a structural space design value, and the value of K is 0.6-0.8.
It is clear that the greater the grinding pressure to which the material is subjected, the more easily it is crushed.
The diameter of the grinding disc is selected according to the actual yield and different raw materials, and the grinding disc is used as a traditional vertical mill for producing cement or raw material products, the traditional vertical mill cannot be directly used for producing machine-made sand, and the detailed description is given in the background art, so that the diameter of the grinding disc, the pressure and the rotating speed of the grinding roller and the design of the material stop ring of the vertical mill for producing the machine-made sand need to be redesigned and matched according to the characteristics of the machine-made sand products, the diameter of the grinding disc 120 of the vertical mill for producing the machine-made sand is preferably 1.2m, the pressure of the grinding roller 110 is preferably 5MPa, and the rotating speed of the grinding disc 120 is preferably 43.8 r/min; in order to prove the utility model discloses can realize utilizing the mechanism sand of the anticipated specification of vertical mill production, the applicant uses the limestone to experiment as raw and other materials, and the production particle size specification is 0.15 ~ 2.36 mm's mechanism sand, to the diameter of mill 120 in this embodiment, and the pressure of grinding roller 110, the rotational speed of mill 120 carry out the mechanism sand test of production to compare with current birotor system sand machine, vertical shaft type impact crusher.
The specific contents are as follows: the limestone is used as a raw material for carrying out an experiment, a machine-made sand vertical mill with a grinding disc 120 and a diameter of 1.2m is adopted, the rotating speed of the grinding disc 120 is 43.8r/min, the grinding pressure is 5MPa, the through type screening material blocking assembly 130 is hollow and has a height of 30mm, the height of the material blocking ring 131 is 8mm, the grinding time is 50min, machine-made sand with a thickness of 0.15-2.36 mm is produced, and 6 tons of the machine-made sand are produced. Adopt the utility model discloses a machine-made sand sphericity coefficient that machine-made sand of the vertical mill production of machine-made sand and current birotor system sand machine, vertical shaft type impact crusher preparation is shown to such as table 1:
TABLE 1 production test results
Obtain in the follow upper table, compare double-rotor system sand machine and vertical axis formula impact crusher, adopt the utility model discloses a quality that mechanism sand founds grinding system sand is more excellent.
The utility model discloses a vertical mill among the production technology system of production multi-product machine-made sand has replaced original circular cone crusher, double rotor system sand machine, vertical shaft type impact crusher etc. has reduced the content of needle slice granule in the product, has reduced mechanism sand fine powder content, has improved the product quality of mechanism sand, has improved system sand energy utilization and has rateed, has reduced the production energy consumption, does benefit to large-scale production, improves resource utilization, does benefit to and improves the concrete performance, does benefit to the engineering quality.
Example 2
Different from the embodiment 1, referring to fig. 4, the material blocking ring of the embodiment is a striding type material blocking ring 140, the upper portion of the striding type material blocking ring 140 is provided with a plurality of material discharging openings 141, so that the striding type material blocking ring 140 forms a concave-convex structure, and the total area of the material discharging openings 141 is 40-60% of the total area of the striding type material blocking ring 140.
The crossing structure enables partial materials to be discharged and partially blocked, reduces the escape amount of the non-ground materials, and improves the content of qualified products in the ground materials. After the material is ground by the grinding roller 110 for a certain time, fine powder is accumulated at the corner at the bottom of the material retaining ring to form a slope, the slope can be used as a stable material layer, and the ground material can be milled through the formed slope after grinding.
The height of the concave part of the striding type material blocking ring 140 is 55-95% of the height of the convex part, and reasonable selection and matching are carried out according to the feeding amount. The interval between two adjacent discharge ports 141 is 100-800 mm, and reasonable selection and matching are carried out according to the feeding amount.
Example 3
Referring to fig. 5 and 6, the combined powder concentrator 300 provided in embodiment 1 includes a sand selecting mechanism 310 and a powder selecting mechanism 320, where the sand selecting mechanism 310 is located below the powder selecting mechanism 320 and connected to each other through an expansion joint 330; the expansion joint 330 is used for compensating the manufacturing error and the deformation of the upper and lower two-part mechanism caused by the temperature change.
The sand selecting mechanism 310 comprises an air inlet shell 311, a sand selecting shell 312 and a sand collecting shell 313, wherein the air inlet shell 311, the sand selecting shell 312 and the sand collecting shell 313 are connected in sequence through flanges; a plurality of air distribution plates 317 are distributed on the side of the air inlet shell 311 close to the sand separation shell 312 from top to bottom, and an air inlet flange port is arranged on the side far away from the sand separation shell 312; the top of the sand selecting shell 312 is provided with a feeding port, the bottom of the sand selecting shell is provided with a coarse material discharging port, and the coarse material discharging port is provided with a heavy hammer type air locking valve 314 which has the functions of discharging and locking air. A plurality of scattering stepped plates 315 are uniformly distributed on the sand separation shell 312 from top to bottom near the air inlet shell 311, each scattering stepped plate 315 forms a certain included angle with the horizontal line, a plurality of guide stepped plates 316 are uniformly distributed on the sand collection shell 313 from top to bottom, the guide stepped plates 316 correspond to the scattering stepped plates 315 one by one, each guide stepped plate 316 forms a certain included angle with the horizontal line, and the inclination direction of each guide stepped plate 316 is opposite to that of the scattering stepped plates 315; the top of the sand collecting shell 313 is connected with one end of an expansion joint 330, the bottom of the sand collecting shell is provided with a sand outlet, and a hammer type air locking valve 314 is arranged at the sand outlet.
The powder selecting mechanism 320 comprises a flow guide shell 321, a powder selecting shell 322, a powder discharging shell 323, a driving device 324, a transmission main shaft 325 and a rotating cage 326, wherein the flow guide shell 321, the powder selecting shell 322 and the powder discharging shell 323 are sequentially arranged from bottom to top and connected through flanges; the driving device 324 is arranged above the powder discharging shell 323 to drive the transmission main shaft 325 to rotate, the transmission main shaft 325 is inserted into the powder discharging shell 323 from top to bottom, the lower part of the transmission main shaft 325 is connected with the rotating cage 326 through a flange, and the rotating cage 326 is arranged in the center of the powder selecting shell 322; the bottom of the flow guide shell 321 is connected with the other end of the expansion joint 330, a sand return cone 329 is arranged on the inner side of the flow guide shell 321, a space is reserved between the sand return cone 329 and the flow guide shell 321, the sand return cone 329 can meet the requirement of passing of gas and materials, and has the function of collecting sand, and a sand return pipe 318 leading to a sand outlet is arranged at the bottom of the sand return cone 329; a plurality of guide vanes 327 are uniformly distributed around the rotating cage 326, the top of each guide vane 327 is connected with the lower bottom plate of the powder outlet shell 323, and the bottom of each guide vane 327 is connected with a sand return cone 329; and an air outlet flange opening of the whole device is arranged in the middle of the powder outlet shell 323.
Preferably, the middle lower parts of the air inlet shell 311 and the sand collecting shell 313 are provided with supporting flanges for fixing the sand selecting mechanism 310 on a bracket, so as to ensure firm installation.
The outer side of the flow guide shell 321 is provided with a plurality of supporting flanges for fixing the powder selecting mechanism 320 on the bracket, so as to ensure firm installation.
The sand return pipe 318 is installed on the inner wall plate of the sand collecting shell 313 on the side far away from the sand selecting shell 312, so that the space is saved and the flow of sand is not obstructed.
In addition, the distribution of the rotating cage 326 and the guide vanes 327 in this embodiment is coaxial with the powder selecting shell 322 and the guide shell 321, so that the sorting efficiency is improved.
The combined powder concentrator 300 of this embodiment further includes a lubricating device 328, and the lubricating device 328 is fixed on the powder concentrator casing 322 to provide lubricating grease for the bearing lubrication of the whole apparatus.
The working process of the combined powder concentrator 300 is as follows:
s1, feeding the materials crushed by the machine-made sand vertical mill 100 into the equipment through a feeding port above the sand selecting shell 312, wherein the materials collide with the broken step plate 315 layer by layer like going down stairs in the falling process, the broken step plate 315 slows down the falling speed of the materials and increases the material sorting time, and the broken materials are scattered to ensure that the materials are separatedThe distribution in the width direction of the equipment is more uniform, and the sorting efficiency is improved. When the materials fall from the upper scattering stepped plate 315 to the lower scattering stepped plate 315, due to the existence of transverse wind, sand and powder are brought to one side of the diversion stepped plate 316 and pass through the diversion stepped plate 316 to reach the sand collecting shell 313; part of the large materials (coarse materials) are scattered by the scattering stepped plate 315 and are rebounded to the flow guiding stepped plate 316 and are rebounded by the flow guiding stepped plate 316, and finally the large materials (coarse materials) are discharged from the discharge hole at the bottom of the sand selecting shell 312 and can be conveyed to the machine-made sand vertical mill 100 to be continuously crushed. The particle size of the sand can be adjusted by adjusting the concentration of the selected powder, which is 100-500g/m3。
S2, most of sand and small part of powder entering the sand collecting shell 313 are settled due to the change of wind speed and wind direction, and are output from a sand outlet at the bottom of the shell; most of the fines and a small portion of the sand are carried away by the gas flow.
S3, the sand and powder carried away by the gas enter the powder selecting casing 322 along with the airflow through the flow guiding casing 321, pass through the gap between the flow guiding vanes 327, in this embodiment, the installation angle α of the flow guiding vanes 327 is 50-75 ° (see fig. 6), and reach the periphery of the rotating cage 326, at this time, the rotating cage 326 rotating at high speed drives the material to perform circular motion, the linear velocity of the rotating cage 326 is 8-20m/S, and in the horizontal direction, the material is subjected to two opposite forces: drag and centrifugal force of the gas on the material. The particle size of the powder is small, and the centrifugal force is smaller than the pulling force of the gas on the powder, so that the powder can pass through the gap of the blades of the rotating cage 326, enter the powder outlet shell 323 and be output from the air outlet flange opening. The sand is instead thrown out by the rotating cage 326, cannot pass through the rotating cage 326, and finally falls into a sand return cone 329 below the rotating cage 326 to be conveyed to a sand outlet through a sand return pipe 318 at the bottom. Here, the particle size of the returned sand can be adjusted by adjusting the installation angle α of the guide vane 327 and the linear velocity of the rotating cage 326.
The combined type powder concentrator 300 can simultaneously separate sand and powder from fed materials, the coarse materials left after separation can return to the machine-made sand vertical mill 100 to continue to be crushed, the closed cycle of crushing and sand separation is realized, the sand grain shape is good, the functions of the vibrating screen 400 and the powder removing machine are integrated, the utilization rate of equipment is improved to the maximum extent, the investment of the equipment is saved, and the power consumption of separation is reduced; the machine-made sand with good gradation is obtained by adjusting parameters such as the concentration of powder selection of the powder selecting machine, the linear velocity of the rotating cage 326, the installation angle of the guide vane 327 and the like during the sand selection.
Example 4
Different from the embodiment 1, referring to fig. 7, a pre-screening device is disposed between the machine-made sand vertical mill 100 and the combined type powder concentrator 300 of the embodiment. The pre-screening apparatus of this embodiment is a trommel 900.
The material after vertical milling is pre-screened before entering the combined type powder concentrator 300, large particles are screened out, the screened large particles are returned to the machine-made sand vertical mill 100 to be milled, and the screened material enters the combined type powder concentrator 300. The technology can reduce the system resistance by about 500-800 Pa, reduce the power consumption of the fan, reduce the material circulation load in the system, reduce the system energy consumption by 5-15%, improve the screening efficiency, improve the particle definition of screened products and improve the product quality.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is also possible to modify the solutions described in the foregoing embodiments or to substitute some or all of the technical features of the foregoing embodiments with equivalents, without departing from the scope of the embodiments of the present invention.
Claims (10)
1. A production process system for producing multi-product machine-made sand is characterized by comprising a raw material bin, a machine-made sand vertical mill, a combined powder concentrator, a vibrating screen and a powder removing mechanism, wherein the powder removing mechanism comprises a cyclone cylinder and a circulating fan, an outlet of the raw material bin is connected with a material inlet of the machine-made sand vertical mill, a material outlet of the machine-made sand vertical mill is connected with a material inlet of the combined powder concentrator, a discharge hole in the bottom of the combined powder concentrator is connected with the vibrating screen, the vibrating screen returns oversize materials to the machine-made sand vertical mill, an air outlet of the combined powder concentrator is connected with the cyclone cylinder, an air outlet of the cyclone cylinder is connected with the circulating fan, and an outlet of the circulating fan is sequentially provided with a dust collector and a tail exhaust fan;
a plurality of layers of screens with different apertures are arranged on the vibrating screen;
the machine-made sand vertical mill comprises a grinding disc, at least two grinding rollers and a material blocking ring, wherein the conical angle of each grinding roller is not more than 20 degrees, and the total projection area of the grinding rollers on the grinding disc is 20-35% of the area of the grinding disc; the material blocking ring is a through type screening material blocking assembly or a crossing type material blocking ring, an auxiliary material discharging assembly is arranged on the grinding disc, and the auxiliary material discharging assembly is located behind each grinding roller along the rotation direction of the grinding disc.
2. The production process system for producing multi-product machine-made sand according to claim 1, wherein the material blocking ring is a through-type screening material blocking assembly, the through-type screening material blocking assembly comprises a material blocking ring and a fastening support piece, the material blocking ring is fixed on the grinding disc through the fastening support piece, and a hollow structure is formed between the material blocking ring and the grinding disc.
3. The production process system for producing multi-product manufactured sand of claim 2, wherein the duty cycle of the hollow structure is 1: (0.4-0.7), and the total height of the through type screening material blocking assembly is 2-6% of the diameter of the grinding disc.
4. The production process system for producing the multi-product machine-made sand according to claim 1, wherein the material blocking ring is a cross-over material blocking ring, a plurality of material discharging ports are formed in the upper portion of the cross-over material blocking ring, so that the material blocking ring forms a concave-convex structure, the total area of the material discharging ports is 40-60% of the total area of the cross-over material blocking ring, the height of the concave portion of the cross-over material blocking ring is 55-95% of the height of the convex portion, and the interval between every two adjacent material discharging ports is 100-800 mm.
5. The production process system for producing multi-product manufactured sand of claim 1, wherein the auxiliary discharge assembly comprises a pneumatic blowing device and/or a mechanical discharge device.
6. The production process system for producing the multi-product machine-made sand according to claim 5, wherein the pneumatic injection device is fixed on the vertical mill shell and used for discharging fine powder generated after grinding in time, a nozzle of the pneumatic injection device extends into the upper part of the mill and faces the side of the material blocking ring or the side of the mill disk, the height of the nozzle of the pneumatic injection device from the surface of the mill disk is 20-100 mm, and the radial distance of the nozzle from the material blocking ring is 5-80 mm.
7. The production process system for producing multi-product machine-made sand according to claim 5, wherein the mechanical discharging device is a shovel plate which is arranged obliquely downwards towards the grinding disc and is used for discharging the ground material in time, one end of the shovel plate is fixed on the vertical mill shell, and the other end of the shovel plate extends to the position above the grinding disc; the shovel plate comprises a material guiding section and a material shoveling section, and the shovel plate is in arc transition at the joint of the material shoveling section and the material guiding section; the distance between the part of the shovel plate above the grinding disc and the grinding roller is 5-30 mm, the distance between the shovel plate and the grinding disc is 5-60 mm, and the distance between the shovel plate and the material retaining ring is 5-80 mm.
8. The production process system for producing multi-product machine-made sand of claim 1, wherein the combined powder concentrator comprises a sand concentrating mechanism and a powder concentrating mechanism, and the sand concentrating mechanism is positioned below the powder concentrating mechanism and connected through an expansion joint;
the sand selecting mechanism comprises an air inlet shell, a sand selecting shell and a sand collecting shell, and the air inlet shell, the sand selecting shell and the sand collecting shell are sequentially connected through flanges; a plurality of air distribution plates are distributed on the air inlet shell from top to bottom on the side close to the sand separation shell, and an air inlet flange port is formed on the side far away from the sand separation shell; the top of the sand separation shell is provided with a feeding port, the bottom of the sand separation shell is provided with a coarse material discharge port, a heavy hammer type air locking valve is arranged at the position of the coarse material discharge port, a plurality of scattering stepped plates are uniformly distributed on the side, close to the air inlet shell, of the sand separation shell from top to bottom, each scattering stepped plate forms a certain included angle with the horizontal line, a plurality of guide stepped plates are uniformly distributed on the side, close to the sand collection shell, of the sand separation shell from top to bottom, the guide stepped plates correspond to the scattering stepped plates one by one, each guide stepped plate forms a certain included angle with the horizontal line, and the inclination direction of the guide; the top of the sand collecting shell is connected with one end of the expansion joint, the bottom of the sand collecting shell is provided with a sand outlet, and a hammer type air locking valve is arranged at the sand outlet;
the powder selecting mechanism comprises a flow guide shell, a powder selecting shell, a powder discharging shell, a driving device, a transmission main shaft and a rotating cage, wherein the flow guide shell, the powder selecting shell and the powder discharging shell are sequentially arranged from bottom to top and are connected through flanges; the driving device is arranged above the powder discharging shell and drives the transmission main shaft to rotate, the transmission main shaft is inserted into the powder discharging shell from top to bottom, the lower part of the transmission main shaft is connected with the rotating cage through a flange, and the rotating cage is arranged in the center of the powder selecting shell; the bottom of the flow guide shell is connected with the other end of the expansion joint, a sand return cone is arranged on the inner side of the flow guide shell, a space is reserved between the sand return cone and the flow guide shell, and a sand return pipe leading to a sand outlet is arranged at the bottom of the sand return cone; a plurality of guide vanes are uniformly distributed around the rotating cage, the tops of the guide vanes are connected with the lower bottom plate of the powder outlet shell, and the bottoms of the guide vanes are connected with the sand return cone; and an air outlet flange opening of the whole equipment is arranged in the middle of the powder outlet shell.
9. The production process system for producing multi-product machine-made sand of claim 8, wherein the middle lower parts of the air inlet shell and the sand collecting shell are provided with supporting flanges for fixing the sand selecting mechanism on the bracket, and the outer side of the flow guide shell is provided with a plurality of supporting flanges for fixing the powder selecting mechanism on the bracket; the sand return pipe is arranged on the inner wall plate of the sand collecting shell body far away from one side of the sand selecting shell body.
10. The production process system for producing multi-product machine-made sand of claim 1, wherein a pre-screening device is arranged between the vertical machine-made sand mill and the combined powder concentrator.
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