CN108355968A - A kind of dry-method sand manufacturing system and method - Google Patents

Abstract

The present invention relates to a kind of dry-method sand manufacturing systems, including belt feeder and sand making machine, further include triple valve, elevator, V-type powder concentrator, multifunction vibration sieve, material distributing valve, dynamic powder concentrator, rotoclone collector, bag collector.The present invention also provides a kind of dry-method sand manufacturing methods.The present invention is suitable for different grain size sandy plain material, by adjusting system powder concentrator air quantity, powder concentrator rotating speed, material distributing valve etc., the Machine-made Sand of production different fineness modulus may be implemented, and content of stone powder in finished sand is greatly reduced, obtains the Machine-made Sand of high quality.In addition, the powder containing quantity that sand processed enters in the process in vibrating screen and sand making machine material can be reduced, improve Vibration Screen component efficiency and sand making machine at sand efficiency, while also avoiding being crushed incomplete material and enter sand separation system processed and lead to that powder concentrator load is big, rotating cage blade wear is fast.

Description

A dry sand making system and method

technical field

The invention relates to the technical field of sand making, in particular to a dry sand making system and method.

Background technique

With the deepening of national infrastructure construction, the demand for sand is huge. In addition, with the strengthening of environmental protection awareness, human beings have realized that sand and gravel are a kind of non-renewable natural resources, and it is impossible to take sand from rivers without limit. , and with the rapid development of concrete technology, modern concrete has higher and higher technical requirements for sand and gravel, and there are fewer and fewer natural sand and gravel that can meet its requirements. Therefore, machine-made sand and gravel have become the main source of sand for construction in my country. In the way of machine-made sand, dry sand-making is not limited by water sources and the environment, and the stone powder produced in the production process can be used reasonably, thus saving water resources and mineral resources to a certain extent, and there is no sewage and sludge It is more environmentally friendly than the wet production line, so it has become the mainstream sand making method at present.

In the existing dry sand making process, there are mainly the following problems:

1) Insufficient adaptability to raw materials. In the current sand making process, most of the raw materials are directly fed into the sand making machine, and when the sand making raw materials contain a lot of fine powder or fine materials (such as raw materials are by-products of the aggregate line), they are directly fed into the sand making machine It will affect the sand forming and shaping efficiency of the sand making machine.

2) The existing sand making process has insufficient separation and screening efficiency. Among the existing sand making systems, some only adopt sedimentation and sorting. For example, the invention patent with the notification number CN101795774A discloses a sand making device, sand making method and sand making, and the invention patent with the notification number CN103611617A discloses a A sand making method and a sand making device. Both of these two invention patent applications use a sedimentation sorting device, that is, the coarse particles and fine particles are separated by sedimentation, and the fine powder is separated from the material by negative pressure suction. This sorting method sorts the materials together, and the fine powder is not completely separated, and the separated sand will still contain more fine powder, which is not conducive to the quality of the finished sand. The invention patent application with the notification number CN 105536974A discloses a dry sand making system. In the invention patent application, the material from the sand making machine first enters the vibrating sieve for screening, because the material contains a certain amount of fine powder, resulting in vibration. The load of the sieve is large, and the screening efficiency is low. At the same time, the fine powder in this system is only separated by a "powder blowing" device, and the separation of the fine powder is not complete, which affects the quality of the finished sand. In addition, the sand making system also only has One screening has limited means of adjusting the fineness modulus of the finished sand, and the product category is single.

3) The products prepared by the existing sand making system are single, and the sand types and sand quality adjustment methods are limited. That is to say, most of the current sand making systems only have one-level sorting system, which not only needs to sort out the finished sand, but also separates the fine powder in the material after sand making, and also needs to separate the unqualified coarse particles and return them to the sand making machine. Re-crushing, but due to the single sorting system, the material sorting efficiency is low, the sorting is not thorough, the type of finished sand is single, and there may be problems such as high fine powder content in the sand and large system circulation.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a dry sand making system and method. When the fine powder/fine particle content in the incoming material is large, a V-type powder separator is used to pre-sort the material. The stone powder and fine materials that can be used as sand are selected in advance, no need to enter the sand making machine, the separation efficiency is high, the load of the sand making machine is reduced, and the efficiency of the sand making machine is improved; the medium-coarse sand after being sorted by the V-type powder classifier The powder is brought into the dynamic classifier by the wind, the material dispersion effect is good, the sorting efficiency is high, and the wear on the rotor cage of the classifier is small; the coarse powder of the V-type classifier enters the multi-functional vibrating screen for screening, and the screening load is greatly reduced , The screening efficiency is improved, and the function of V-type powder separator, dynamic powder separator and vibrating screen to perform their duties and cooperate with each other is realized.

The technical solution adopted by the present invention to solve the technical problem is: a dry sand making system, including a belt feeder and a sand making machine, and also includes a three-way valve, a hoist, a V-type powder separator, a multifunctional vibrating screen, Material distribution valve, dynamic powder classifier, bag dust collector; the feed port of the three-way valve is connected with the belt feeder, and its two discharge ports are respectively connected with the feed port of the sand making machine and the V-shaped powder classifier The feed port of the sand making machine is connected; the discharge port of the sand making machine is connected with the feed port of the V-type powder separator through the hoist; the air outlet of the V-type powder separator is connected with the dynamic powder separator, and the V-type The coarse powder discharge port of the powder separator is connected with the feed port of the multi-functional vibrating screen; the air outlet of the dynamic powder separator is connected with the bag dust collector. The dynamic powder separator is equipped with a coarse material discharge port and a medium coarse material Discharge port; the multi-functional vibrating screen is provided with two layers of sieves. The aperture of the upper sieve is larger than that of the lower sieve. The feed port of the distribution valve is connected, and the bottom of the multifunctional vibrating screen is provided with a feed port; the material distribution valve is provided with two discharge ports, one of which is connected with the feed port of the sand making machine.

As a further preferred embodiment, a cyclone separator is also provided between the dynamic powder classifier and the bag filter.

As a further preferred embodiment, the air outlet of the bag dust collector is connected to the exhaust fan, and the outlet of the exhaust fan is divided into two paths, one path is emptied, and the other path is recycled to the V-type powder classifier.

As a further preferred embodiment, a circulating fan is provided between the air outlet of the cyclone separator and the bag dust collector. The air outlet of the circulating fan is divided into two paths, one of which circulates back to the V-type powder separator, and the other of which enters the bag filter. dust collector.

As a further preferred embodiment, the aperture of the upper sieve is 4.75mm, and the aperture of the lower sieve is 2.36mm.

As a further preferred embodiment, the openings of the outlets of the material distributors are all adjustable.

As a further preferred embodiment, a static coarse powder separator is provided at the inner inlet of the dynamic classifier.

The present invention also provides a dry sand making method, which uses the above dry sand making system to make sand, specifically:

Sand-making raw materials are fed into the three-way valve through the feeding belt conveyor. When there are many fine materials in the raw materials, they are fed into the V-type powder separator through the three-way valve; when there are few fine materials in the raw materials, they are fed through the three-way valve. Sand making machine: The material is crushed and shaped by the sand making machine, and then fed into the V-type powder separator through the elevator for separation. The fine materials after separation are carried out with the gas through the air outlet, and enter the dynamic powder separator for classification The coarse material is discharged from the coarse material discharge port into the multifunctional vibrating sieve for screening; the dynamic powder separator is a three-separation powder separator, and the materials entering the dynamic powder separator are finely divided after being sorted by the dynamic powder separator. The powder is taken out from the air outlet and enters the cyclone dust collector for separation, and the remaining coarse powder is discharged through the medium and coarse material discharge port and the coarse material discharge port respectively, and is used as finished sand B and finished sand C with different fineness modulus respectively;

The materials entering the multi-functional vibrating screen 6 are sieved by two layers of sieves (generally the upper sieve has an aperture of 4.75mm and the lower sieve has an aperture of 2.36mm), and the materials retained by the upper sieve (materials with a particle size greater than 4.75mm) pass into the system. The sand machine is re-crushed and shaped, and the materials retained by the lower sieve (materials with a particle size between 2.36mm and 4.75mm) enter the material distributor, and part or all of the materials that enter the material distributor are mixed with the material of the multi-functional vibrating screen. Form finished sand D;

The materials collected by cyclone dust collector and bag dust collector are used as by-product stone powder.

Further, it also includes mixing two or three of finished sand B, finished sand C and finished sand D to form finished sand A.

The positive effect of the present invention: the multi-functional sand making system of the present invention can adapt to the particle size of sand making raw materials with different particle sizes. When there are many fine materials in the raw material, it can be fed into the V-type powder separator through the three-way valve; When there is less fine material in the raw material, it can be selectively fed into the sand making machine through the three-way valve, so as to reduce the content of fine powder entering the sand making machine, improve the sand forming efficiency of the sand making machine, and reduce the powder output. In addition, according to the requirements of the finished sand, the three materials B, C, and D can be used alone or mixed with each other as the finished sand, and the finished sand with different fineness modulus requirements such as medium, coarse, and fine can be prepared. At the same time, through the powder selection The adjustment of the system and the vibrating screen material distribution system can adjust the fineness modulus of the finished sand, that is, it is more convenient to adjust the quality and fineness modulus of the finished sand. In a word, the present invention can adapt to sand-making raw materials of different particle sizes; second, the present invention divides the finished sand into multiple particle grades, and can separately use each grade of sand as coarse sand according to the gradation and fineness modulus requirements of the machine-made sand Sand, medium sand and fine sand products can also be mixed with multiple sands of different particle sizes into one finished sand, which has strong product selectivity, convenient adjustment of gradation and fineness modulus; third, the present invention adopts efficient The sorting system makes the powder content in the finished sand greatly reduced, and improves the quality and adaptability of the finished sand. At the same time, the materials discharged from the sand making machine are sorted by airflow first and then screened and classified, which can improve the sorting efficiency and realize The V-shaped powder separator, dynamic powder separator and vibrating screen cooperate with each other and perform their respective duties, realizing efficient sorting and screening.

Description of drawings

Fig. 1 is the structural representation of dry sand making system described in embodiment 1;

Fig. 2 is the structural representation of dry sand making system described in embodiment 2;

Fig. 3 is the structural representation of dry sand making system described in embodiment 3;

Fig. 4 is a schematic structural view of the dry sand making system described in Example 4. In the figure, 1: feeding belt conveyor, 2: three-way valve, 3: sand making machine, 4: elevator, 5: V-type powder separator, 6: multi-functional vibrating screen, 7: material distribution valve, 8: Dynamic powder separator, 9: Cyclone dust collector, 10: Circulation fan, 11: Bag dust collector; 12: Exhaust fan;

6-1: Coarse material outlet of the multifunctional vibrating screen, 6-2: Coarse material outlet of the multifunctional vibrating sieve, 6-3: Fine material outlet of the multifunctional vibrating sieve;

8-1: Coarse material discharge port in dynamic powder classifier, 8-2: Coarse material discharge port in dynamic powder classifier; 8-3: Static coarse powder separator.

Detailed ways

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

With reference to Fig. 1, preferred embodiment 1 of the present invention provides a kind of dry sand making system, comprises belt feeder 1 and sand making machine 3, also includes three-way valve 2, elevator 4, V-type powder classifier 5, multifunctional Vibrating screen 6, material distribution valve 7, dynamic powder separator 8, bag dust collector 11; the feed port of the three-way valve 2 is connected to the belt feeder 1, and its two discharge ports are respectively connected to the sand making machine The feed port of 3 is connected with the feed port of V-type powder separator 5; the discharge port of said sand making machine 3 is connected with the feed port of V-type powder separator 5 through elevator 4; The air outlet of the powder machine 5 is connected with the dynamic powder separator 8, the coarse powder outlet of the V-shaped powder separator is connected with the feed port of the multifunctional vibrating screen 6; the air outlet of the dynamic powder separator 8 is connected with the bag dust collector 11 connected, the dynamic powder separator is provided with a coarse material discharge port 8-2 and a medium coarse material discharge port 8-1; the multi-functional vibrating screen 6 is provided with two layers of sieves, and the aperture of the upper sieve is larger than that of the lower sieve The aperture of the upper sieve (the coarse material outlet 6-1 of the multifunctional vibrating sieve) is connected to the feed inlet of the sand making machine 3, and the retained material outlet of the lower sieve (the coarse material outlet of the multifunctional vibrating sieve) Port 6-2) is connected with the feed port of material distribution valve 7, and the bottom of the multifunctional vibrating screen is provided with a feeding port (multifunctional vibrating screen fine material discharge port 6-3); the material distribution valve is provided with two There are two discharge ports, one of which is connected to the feed port of the sand making machine 3.

The air outlet of the bag dust collector 11 is connected with the exhaust fan 12, and the outlet of the exhaust fan 12 is divided into two paths, one path is emptied, and the other path is circulated back to the V-type powder separator 5.

Example 2

Referring to FIG. 2 , preferred embodiment 2 of the present invention provides a dry sand making system. The difference from embodiment 1 is that a cyclone separator 9 is also provided between the dynamic powder separator 8 and the bag filter 11 .

Example 3

Referring to Fig. 3, the preferred embodiment 3 of the present invention provides a dry sand making system, and the difference from embodiment 2 is that a circulating fan 10 is also provided between the air outlet of the cyclone separator 9 and the bag dust collector 11 , the air outlet of the circulating fan 10 is divided into two paths, one path is circulated back to the V-type powder separator 5, and the other path enters the bag dust collector 11, the air outlet of the bag dust collector 11 is connected with the exhaust fan 12, and enters the bag dust collector. After the dust removal and purification of the gas in the duster 11, it is directly emptied through the exhaust fan 12.

Example 4

With reference to Fig. 4, preferred embodiment 4 of the present invention provides a kind of dry sand making system, and the difference with embodiment 1 is, the internal entrance of described dynamic powder classifier is provided with static coarse powder separator 8-3, and its function Yes: The large particles brought in from the V-type powder classifier collide with the blades of the static coarse powder separator and fall back to the V-type powder classifier, which can reduce the number of large particles entering the dynamic powder classifier, thereby reducing the dynamic powder classifier. The coarse material in the machine and the large particle material in the coarse material can achieve more accurate classification.

Example 5

Preferred embodiment 5 of the present invention provides a dry sand making method, using the above dry sand making system to make sand, specifically:

Sand-making raw materials are fed into the three-way valve through the feeding belt conveyor. When there are many fine materials in the raw materials, they are fed into the V-type powder separator through the three-way valve; when there are few fine materials in the raw materials, they are fed through the three-way valve. Sand making machine: The material is crushed and shaped by the sand making machine, and then fed into the V-type powder separator through the elevator for separation. The fine materials after separation are carried out with the gas through the air outlet, and enter the dynamic powder separator for classification The coarse material is discharged from the coarse material discharge port into the multifunctional vibrating sieve for screening; the dynamic powder separator is a three-separation powder separator, and the materials entering the dynamic powder separator are finely divided after being sorted by the dynamic powder separator. The powder is taken out from the air outlet and enters the cyclone dust collector for separation, and the remaining coarse powder is discharged through the medium and coarse material discharge port and the coarse material discharge port respectively, and is used as finished sand B and finished sand C with different fineness modulus respectively;

The material entering the multi-functional vibrating screen passes through the upper screen and the material retained by the upper screen enters the sand making machine for re-crushing and shaping, and the material retained by the lower screen enters the material distributor, and part or all of the material entering the material distributor is combined with the lower part of the multi-functional vibrating screen. Materials are mixed to form finished sand D;

The materials collected by cyclone dust collector and bag dust collector are used as by-product stone powder.

According to the requirements of the finished sand, the three materials B, C, and D can be used alone as the finished sand, or two or three of the finished sand B, the finished sand C and the finished sand D can be mixed to form the finished sand A.

The middle and lower part of the dynamic classifier is equipped with a static coarse powder separator; the opening of the discharge port of the material distribution valve can be adjusted from 0 to 100%, and then the coarse sand content in the finished sand D can be adjusted , to adjust the fineness modulus.

The invention can adapt to sand making raw materials with different particle sizes. By adjusting the air volume of the powder separator, the speed of the powder separator, and the material distribution valve, etc., it can realize the production of machine-made sand with different fineness modulus, and greatly reduce the content of stone powder in the finished sand, and obtain High-quality machine-made sand. In addition, it can reduce the powder content of the materials entering the vibrating screen and sand making machine during the sand making process, improve the screening efficiency of the vibrating screen and the sand making efficiency of the sand making machine, and also prevent the incompletely broken materials from entering the sand making machine. The separation system leads to problems such as heavy load on the powder separator and rapid wear of the rotor blades.

The above are only preferred embodiments of the present invention. It should be understood that the descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, etc. made within the ideas and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A dry sand making system, including a belt feeder and a sand making machine, characterized in that it also includes a three-way valve, a hoist, a V-type powder separator, a multifunctional vibrating screen, a material distribution valve, and a dynamic powder separator. machine, bag dust collector; the feed port of the three-way valve is connected with the belt feeder, and its two discharge ports are respectively connected with the feed port of the sand making machine and the feed port of the V-type powder classifier; The discharge port of the sand making machine is connected with the feed port of the V-type powder separator through the elevator; the air outlet of the V-type powder separator is connected with the dynamic powder separator, and the coarse powder of the V-type powder separator The feed port is connected to the feed port of the multi-functional vibrating screen; the air outlet of the dynamic powder separator is connected to the bag dust collector. The dynamic powder separator is equipped with a coarse material discharge port and a medium coarse material discharge port; There are two layers of sieves in the vibrating screen. The aperture of the upper sieve is larger than that of the lower sieve. The outlet of the retained material of the upper sieve is connected with the feed port of the sand making machine, and the retained material of the lower sieve is connected with the feed port of the material distribution valve. , the bottom of the multifunctional vibrating screen is provided with a discharge port; the material distribution valve is provided with two discharge ports, one of which is connected to the feed port of the sand making machine. 2. A dry sand making system according to claim 1, characterized in that: a cyclone separator is also provided between the dynamic powder classifier and the bag filter. 3. A dry sand making system according to claim 1, characterized in that: the air outlet of the bag filter is connected to the exhaust fan, and the outlet of the exhaust fan is divided into two paths, one for emptying and one for circulation back to V type powder separator. 4. A dry sand making system according to claim 2, characterized in that: a circulation fan is provided between the air outlet of the cyclone separator and the bag filter, and the air outlet of the circulation fan is divided into two paths, One way circulates back to the V-type powder separator, and the other way enters the bag dust collector. 5. A dry sand making system according to any one of claims 1-4, characterized in that: the aperture of the upper sieve is 4.75 mm, and the aperture of the lower sieve is 2.36 mm. 6. A dry sand making system according to any one of claims 1-4, characterized in that: the openings of the outlets of the material distributors are all adjustable. 7. A dry sand making system according to any one of claims 1-4, characterized in that: a static coarse powder separator is arranged at the inner entrance of the dynamic powder separator. 8. A dry sand making method, using the dry sand making system according to claim 1 or 2 to make sand, characterized in that, specifically: Sand-making raw materials are fed into the three-way valve through the feeding belt conveyor. When there are many fine materials in the raw materials, they are fed into the V-type powder separator through the three-way valve; when there are few fine materials in the raw materials, they are fed through the three-way valve. Sand making machine: The material is crushed and shaped by the sand making machine, and then fed into the V-type powder separator through the elevator for separation. The fine materials after separation are carried out with the gas through the air outlet, and enter the dynamic powder separator for classification The coarse material is discharged from the coarse material discharge port into the multifunctional vibrating sieve for screening; the dynamic powder separator is a three-separation powder separator, and the materials entering the dynamic powder separator are finely divided after being sorted by the dynamic powder separator. The powder is taken out from the air outlet and enters the cyclone dust collector for separation, and the remaining coarse powder is discharged through the medium and coarse material discharge port and the coarse material discharge port respectively, and is used as finished sand B and finished sand C with different fineness modulus respectively; The material entering the multi-functional vibrating screen passes through the upper screen and the material retained by the upper screen enters the sand making machine for re-crushing and shaping, and the material retained by the lower screen enters the material distributor, and part or all of the material entering the material distributor is combined with the lower part of the multi-functional vibrating screen. Materials are mixed to form finished sand D; The materials collected by cyclone dust collector and bag dust collector are used as by-product stone powder. 9. A dry sand making method according to claim 1, characterized in that it further comprises mixing two or three of finished sand B, finished sand C and finished sand D to form finished sand A.