CN111604152A - Machine-made sand production equipment for concrete - Google Patents

Abstract

The invention relates to a concrete machine-made sand production device, relates to the technical field of machine-made sand preparation, and aims to solve the problems that in an existing machine-made sand production system, stone powder and soil are removed together, and the removed stone powder and soil are difficult to separate, so that the stone powder generated in the sand making process is difficult to recycle. It includes the stone storehouse, locates the stone scrubber equipment in stone storehouse exit, with stone scrubber equipment consecutive rubble equipment, grit transmission device and sieve sand equipment, the export that sieve sand equipment goes out the finest material is equipped with the mountain flour and collects the storehouse. The invention has the beneficial effect of separating, cleaning and collecting the stone powder and the soil in the machine-made sand.

Description

Machine-made sand production equipment for concrete

technical field

The invention relates to the technical field of machine-made sand preparation, in particular to a machine-made sand production equipment for concrete.

Background technique

Sand and gravel are the most mined resources in my country. With the gradual depletion of natural sand and gravel resources, machine-made sand and gravel will become the main source of construction aggregates. Machine-made sand refers to the sand processed by sand making machines and other auxiliary equipment. Since a variety of stones and various tailings waste resources can be used to process machine-made sand, the sand sources are wide and the machine-made sand has a complete gradation. The particles are stable and the particle shape is controllable, which can be adjusted according to the needs of sand. Therefore, it is a general trend to replace natural sand with machine-made sand. At the same time, because the particle size of machine-made sand is more irregular, when using cement and other structures to bond, it tends to have better adhesion, more compression resistance, and longer service life. Therefore, in the preparation of high-performance concrete, such as C70 , C80 concrete, machine-made sand has become the best choice.

The quality indicators of sand and gravel gradation, grain shape, mud content and powder content of machine-made sand directly affect the working performance, mechanical properties, durability and cost of concrete. In order to reduce the content of mud and stone powder in the manufactured sand, sand washing equipment is usually installed after the feeder, crusher, sand making machine and vibrating screen in the manufactured sand production line to wash and remove the mud and stone powder in the sand and gravel. After drying, it is added to the finished product warehouse, thereby reducing the stone powder content and mud content in the machine-made sand.

For example, the invention with publication number CN107511241A discloses a machine-made sand production system, including a vibrating feeder, a conveyor 1 is arranged below the vibrating feeder, a coarse crusher is arranged below the first conveyor, and the outlet of the first conveyor is The feeding port corresponds to the feeding port of the coarse crusher. There is a fine crushing machine on one side of the coarse crushing machine. The discharging port of the coarse crushing machine is connected with the feeding port of the There is a vibrating sorting screen 1 at the material outlet, and the vibrating sorting screen 1 is connected to the fine crusher through the second conveyor. The material port is connected with the sand washing machine, and the sand washing machine is connected with the finished sand silo.

In this machine-made sand production system, the materials that meet the particle size requirements are gradually screened out by different processing and grading screening of the materials, so as to prevent the qualified materials from being repeatedly crushed and ground, and the sand washing machine reduces the amount of stone dust in the machine-made sand. produced, which improves the quality of machine-made sand.

However, in the above-mentioned prior art, in the process of cleaning the machine-made sand by the sand washing machine, the soil and the stone powder are cleaned simultaneously, and the solids in the washed water include the mixture of the soil and the stone powder. However, the simple stone powder has a wide range of uses. , it can be used alone, but when using the above system for sand washing, it is difficult to separate the stone powder from the soil, which makes it difficult to recycle the stone powder produced in the sand making process.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a machine-made sand production equipment for concrete, which has the beneficial effect of separately cleaning and collecting the stone powder and soil in the machine-made sand.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

A machine-made sand production equipment for concrete, comprising a stone silo, a stone washing device arranged at the outlet of the stone silo, a crushing device connected with the stone washing device in sequence, a sand and gravel transmission device and a sand screening device. The outlet of the most fine material from the sand screening equipment is equipped with a stone powder collection bin.

By adopting the above technical solution, the stone is cleaned before it is broken, and the soil on the surface of the stone is removed. At this time, there is only lime and soil in the cleaned water, and then the stone is broken in the stone crushing equipment, and the broken stone is mixed. In the process of sifting with sand screening equipment, most of the stone powder can be directly sifted out, and a small amount of stone powder is mixed in the machine-made sand, but a small amount of stone powder will improve the fluidity and frost resistance of ultra-high performance concrete. , compressive resistance and flexural strength performance, so there is no need to use sand washing equipment for thorough secondary cleaning of sand and gravel after crushing. The sieved stone powder has a high purity and can be directly recycled, which saves costs. The sewage after cleaning the stone is precipitated to form a mud with less stone, which can be directly discharged or used for planting, etc., so that the soil and stone powder can be recycled and reused separately. At the same time, the stone after cleaning the soil is relatively wet, which can reduce the dust emission during the crushing process and reduce the pollution to the environment.

In a preferred example of the present invention, it can be further configured as follows: the stone washing equipment includes a drum chamber with an upper opening, a transmission shaft arranged in the drum chamber along the length direction of the drum chamber, and a transmission shaft connected to the transmission shaft. Spiral blades, a water spray pipe arranged above the drum bin and a high-pressure spray head connected below the water spray tube, a drive motor is connected to one end of the transmission shaft, the drum bin is arranged obliquely, and the stone material bin is located in the Above the lower end of the drum silo, a sludge outlet is provided below the lower end of the drum silo, a stone outlet is arranged at the upper end of the drum silo, and the stone crushing equipment is located below the stone outlet.

By adopting the above technical solution, after the stone material in the stone silo falls to the lower end of the drum silo, with the rotation of the driving motor, the transmission shaft drives the spiral blade to rotate to transmit the stone material, and the stone material is turned over as it moves. The stone is sprayed with water to wash the surface of the stone, and the washed soil flows to the lower end of the drum silo, and finally flows out from the sludge outlet, and the transferred stone falls from the stone outlet to the rockfall equipment for crushing. While cleaning the crushed stone, the stone washing equipment utilizes the inclined setting of the drum bin, which better achieves the purpose of separating the muddy water and the stone.

In a preferred example of the present invention, it can be further configured as follows: a stirring rod is connected to the transmission shaft.

By adopting the above technical solution, the stirring rod rotates with the rotation of the transmission shaft, thereby stirring the crushed stone, causing friction between the crushed stones, washing down the stubborn sludge adhered to the surface, and washing the sludge more thoroughly .

In a preferred example of the present invention, it can be further configured as follows: the helical blade is provided with a guide hole, and the edge of the helical blade is serrated.

By adopting the above technical scheme, the passage of sludge is further facilitated, and the accumulation of sludge is reduced.

In a preferred example of the present invention, it can be further configured that: the stone crushing equipment includes a coarse crusher and a fine crusher, and the sand and gravel transmission equipment is connected to the sand screening equipment, the coarse crusher and the sand screening equipment with the shredder.

By adopting the above technical solution, the sand and gravel materials from the coarse crusher are firstly screened by the sand screening equipment, and a small part of the materials with smaller volumes are screened, and the large materials reach the fine crusher through the sand and gravel conveying equipment. Internal secondary crushing is carried out, the material is crushed twice, and is screened once after the primary crushing to prevent some of the materials that have been crushed into small particles from becoming smaller after the second screening in the fine crusher. The content of stone powder in the manufactured sand is high, and the finished product rate of the manufactured sand is low.

In a preferred example of the present invention, it can be further configured that: the sand screening equipment is a multi-stage vibrating sand screening machine, which includes a casing, a feeding port provided on the casing, a feeding port provided on the feeding The primary screen and the secondary screen below the mouth, the mesh of the secondary screen is smaller than the mesh of the primary screen, and one side of the primary screen is provided with a coarse sand outlet, a secondary screen A finished sand outlet is arranged on one side of the screen, and a stone powder outlet is arranged below the secondary screen; the sand and gravel transmission device includes a screw conveyor arranged between the coarse crusher and the multi-stage vibrating sand screener and a The coarse sand conveyor belt and the fine sand conveyor belt are arranged between the multi-stage vibrating sand screener and the fine crusher, and the coarse sand conveyor belt is connected from the coarse sand outlet to the feed port of the fine crusher, so The fine sand conveyor belt is connected from the sand outlet of the fine crusher to the feed port of the sand screening equipment.

By adopting the above technical solution, the conveying path of the sand and gravel is that after the initial crushing of the stone in the coarse crusher, it is conveyed to the sand screening equipment via the screw conveyor for initial screening, and a small part of the qualified aggregate is screened. Aggregates with larger particles fall onto the coarse sand conveyor belt through the coarse sand outlet, and are transported by the coarse sand conveyor belt to the fine crusher for secondary crushing. The conveyor belt is transferred to the feed port of the fine crusher, and is screened by the primary screen and the secondary screen in turn. The machine-made sand that meets the requirements remains on the secondary screen and flows out from the outlet of the finished sand, while the stone powder is filtered from the secondary screen. After falling on the net, it finally flows out from the stone powder outlet and is recycled. After two crushing, the coarse sand that does not meet the requirements is returned to the fine crusher for re-crushing. The quality of the finished machine-made sand obtained through the above steps is high, neither the particles are too large nor too small, and the stone powder can be recovered centrally, and the utilization rate of the stone material is high.

In a preferred example of the present invention, it can be further configured to further include a drying mechanism, and the drying mechanism is disposed along the sand and gravel conveying device.

By adopting the above technical solution, the sand and gravel are dried during the conveying process, and the drying of the sand and gravel does not occupy additional process and space, the cost is reduced, and the sand-making efficiency is improved.

In a preferred example of the present invention, it can be further configured as follows: the conveying cylinder of the screw conveyor is a double-layered cylinder, and the drying mechanism includes a steam generating device, a steam pipe connected to the steam generating device, and a steam pipe connected to the steam generating device. The steam inlet and the steam outlet on the outer wall of the conveying cylinder, and the steam pipe is connected to the steam inlet.

By adopting the above technical solution, the hot steam generated by the steam generator enters the conveying cylinder of the screw conveyor to heat the conveying cylinder, so that the sand and gravel are dried during the conveying process, and the crushed stone enters the sand screening equipment for the first time. When in a dry state, the screening effect is better.

To sum up, the present invention includes at least one of the following beneficial technical effects:

1. By setting up the stone washing equipment before the crushing equipment, the soil and the stone powder are separated in different processes, and the sieved stone powder is of high purity, which can be directly recycled, saving costs; the sewage after cleaning the stone is formed after sedimentation. The mud with less stone can be directly discharged or used for planting, etc., achieving the effect of separate recycling of soil and stone powder.

2. The stone material after cleaning the soil is relatively wet, which can reduce the dust emission during the crushing process and reduce the pollution to the environment;

3. The quality of the finished machine-made sand obtained is high, and the particles are neither too large nor too small;

4. By setting the drying device, the sand and gravel are kept dry before entering the sand screening equipment, thereby reducing the adhesion between the sand and gravel particles and making the sand and gravel screening more thorough.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a partial enlarged schematic view of part A in FIG. 1 .

Figure 3 is a schematic diagram of the layout of the crushing equipment and the sand and gravel conveying device.

Fig. 4 is a schematic cross-sectional view of the screw conveyor.

In the figure, 1, stone bin; 2, stone washing equipment; 21, drum bin; 22, drive motor; 23, transmission shaft; 24, spiral blade; 241, guide hole; 25, stirring rod; 26, stone outlet; 27. Sludge outlet; 28. Water spray pipe; 29. High pressure nozzle; 3. Crushing equipment; 31. Coarse crusher; 32. Fine crusher; 4. Sand and gravel transmission device; 41. Screw conveyor; 42. Coarse crusher Sand conveyor belt; 43. Fine sand conveyor belt; 5. Drying mechanism; 51. Steam generating device; 52. Steam pipe; 53. Steam inlet; 54. Steam outlet; 6. Sand screening equipment; 61. Housing; 62, feed inlet; 63, primary screen; 64, secondary screen; 65, coarse sand outlet; 66, finished sand outlet; 67, stone powder outlet; 7, stone powder collection bin.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , it is a machine-made sand production equipment for concrete disclosed in the present invention, including a stone silo 1, a stone washing device 2 located at the exit of the stone silo 1, a crushing device 3 connected to the stone washing device 2 in turn, a sand The stone conveying device 4, the drying mechanism 5 and the sand screening equipment 6 are provided with a stone powder collection bin 7 at the outlet of the sand screening equipment 6 for the finest materials.

1 and 2, the stone washing equipment 2 includes a drum chamber 21 with an upper opening, a transmission shaft 23 arranged in the drum chamber 21 along the length direction of the drum chamber 21, a spiral blade 24 connected to the transmission shaft 23, The water spray pipe 28 above the drum chamber 21 and the high-pressure spray head 29 connected to the bottom of the water spray pipe 28 are connected to one end of the transmission shaft 23 with a drive motor 22 that drives the transmission shaft 23 to rotate, and a stirring rod 25 is connected to the transmission shaft 23 at intervals. The stirring rod 25 rotates with the rotation of the transmission shaft 23, thereby stirring the crushed stone, causing friction between the crushed stones, washing down the stubborn sludge adhered to the surface, and washing the sludge more thoroughly. In order to realize the separation of muddy water and stone material more thoroughly, the drum bin 21 is inclined, the stone bin 1 is arranged above the low end of the drum bin 21, the sludge outlet 27 is provided under the low end of the drum bin 21, and the high end of the drum bin 21 is provided There is a stone outlet 26, and the crushing equipment 3 is located below the stone outlet 26. At the same time, a number of guide holes 241 are arranged on the spiral blade 24, and the edge of the spiral blade 24 is set to a serrated shape, so that the spiral blade 24 set in this way can facilitate the passage of sludge, Reduce sludge accumulation.

After the stone in the stone bin 1 falls to the lower end of the drum bin 21, with the rotation of the driving motor 22, the transmission shaft 23 drives the spiral blade 24 to rotate to transport the stone, and the stone is turned while moving, and at the same time, the high-pressure nozzle The stone is sprayed with water to wash the surface of the stone, and the washed soil flows to the lower end of the drum bin 21, and finally flows out from the sludge outlet 27, and the transferred stone falls from the stone outlet 26 to the rockfall equipment for crushing. The stone washing equipment 2 utilizes the inclined setting of the drum bin 21 while cleaning the crushed stone, which better achieves the purpose of separating the muddy water from the stone.

3, the crushing equipment 3 in this embodiment includes a coarse crusher 31 and a fine crusher 32, wherein the coarse crusher 31 adopts a jaw crusher, and the fine crusher 32 adopts an impact crusher.

3, the sand screening equipment 6 is a multi-stage vibrating sand screening machine, which includes a casing 61, a feeding port 62 provided on the casing 61, a first-level screen 63 and a second screen disposed below the feeding port 62. The meshes of the primary screen 64 and the secondary screen 64 are smaller than those of the primary screen 63, and the bottoms of the primary screen 63, the secondary screen 64 and the multi-stage vibrating sand screen are all inclined and arranged at the bottom of the screen. The lowest end shrinks to one place, the coarse sand outlet 65 is formed at the lower end of the primary screen 63, the finished sand outlet 66 is formed at the lower end of the secondary screen 64, and the stone powder outlet 67 is formed at the bottom of the multi-stage vibrating sand screen.

Referring to FIG. 3 , the sand and gravel transmission device 4 includes a screw conveyor 41 arranged between the coarse crusher 31 and the multi-stage vibrating sand screen and a coarse sand set between the multi-stage vibrating sand screen and the fine crusher 32 Conveyor belt 42 and fine sand conveyor belt 43 . The conveying cylinder of the screw conveyor 41 is a double-layer cylinder, the inlet of the screw conveyor 41 is located below the discharge port of the coarse crusher 31, and the outlet is located above the feed port 62 of the multi-stage vibrating sand screen. The coarse sand outlet 65 is connected to the feed port 62 of the fine crusher 32 , and the fine sand conveyor 43 is connected from the sand outlet of the fine crusher 32 to the feed port 62 of the sand screening device 6 .

3 and 4, the drying mechanism 5 includes a steam generating device 51, a steam pipe 52 connected to the steam generating device 51, a steam inlet 53 and a steam outlet 54 provided on the outer wall of the conveying cylinder, and the steam pipe 52 is connected to the steam inlet 53, and the steam generating device 51 in this embodiment is a steam generator. The hot steam generated by the steam generator enters the conveying cylinder of the screw conveyor, and heats the conveying cylinder, so that the sand and gravel are dried during the conveying process. The screening effect is better, and at the same time, the drying of sand and gravel will not occupy additional process and space, the cost is reduced, and the sand making efficiency is improved.

The implementation process and principle of the present invention are as follows: after the stone enters the factory, it is stored in the stone silo 1, and when the machine-made sand is prepared, the production line is turned on, and the stone enters the drum silo 21 from the stone silo 1. It is cleaned inside, the stone after cleaning falls into the coarse crusher 31 from the stone outlet 26, the mud flows out from the sludge outlet 27, and after precipitation, a mud containing less stones is formed, which can be directly discharged or used for planting, etc. . The stones falling into the primary crusher 31 are initially crushed in the primary crusher 31, and then transferred to the sand screening equipment 6 for primary screening via the screw conveyor 41. The screw conveyor 41 is in the process of conveying the sand and gravel. , start the drying mechanism 5 to dry the sand and gravel to prevent the sand and gravel particles from sticking to each other, which is conducive to full screening. The large aggregate falls on the coarse sand conveyor belt 42 through the coarse sand outlet 65, and is transported by the coarse sand conveyor belt 42 to the fine crusher 32 for the second crushing, and the crushed sand falls on the fine sand conveyor belt 43. It is conveyed by the fine sand conveyor belt 43 to the feeding port 62 of the fine crusher 32, and is screened by the primary screen 63 and the secondary screen 64 in turn, and the coarse sand that does not meet the requirements is returned to the fine crusher 32 again. Crushing, without mixing with the stone in the coarse crusher 31, affecting the crushing effect; the machine-made sand that meets the requirements remains on the secondary screen 64 and flows out from the finished sand outlet 66, while most of the stone powder can be removed from the secondary screen 64. The grade screen 64 falls down, and finally flows out from the stone powder outlet 67 and is recovered. The remaining small amount of stone powder is mixed in the finished machine-made sand, but a small amount of stone powder will improve the fluidity, frost resistance, compression resistance and resistance of ultra-high performance concrete. Therefore, there is no need to use sand washing equipment for thorough secondary cleaning of the sand and gravel after crushing. The recovered stone powder is of high purity and can be directly recycled, saving costs and achieving the separation of soil and stone powder. Effect.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (8)

1. The utility model provides a mechanism sand production facility for concrete which characterized in that: including stone storehouse (1), locate stone scrubber (2) in stone storehouse (1) exit, with stone scrubber (2) continuous rubble equipment (3), grit transmission device (4) and sieve sand equipment (6) in proper order, the export that sieve sand equipment (6) go out the finest material is equipped with mountain flour and collects storehouse (7).

2. The machine-made sand production apparatus for concrete according to claim 1, characterized in that: the stone washing equipment (2) comprises a roller silo (21) with an opening in the upper part, a transmission shaft (23) arranged in the roller silo (21) along the length direction of the roller silo (21), a spiral blade (24) connected to the transmission shaft (23), a water spray pipe (28) arranged above the roller silo (21) and a high-pressure spray head (29) connected below the water spray pipe (28), wherein one end of the transmission shaft (23) is connected with a driving motor (22), the roller silo (21) is obliquely arranged, the stone silo (1) is arranged above the lower end of the roller silo (21), a sludge outlet (27) is arranged below the lower end of the roller silo (21), a stone outlet (26) is arranged at the high end of the roller silo (21), and the stone crushing equipment (3) is arranged below the stone outlet (26).

3. The machine-made sand production apparatus for concrete according to claim 2, characterized in that: the transmission shaft (23) is connected with a stirring rod (25).

4. The machine-made sand production apparatus for concrete according to claim 2, characterized in that: the spiral blade (24) is provided with a flow guide hole (241), and the edge of the spiral blade (24) is serrated.

5. The machine-made sand production apparatus for concrete according to claim 1, characterized in that: the stone crushing equipment (3) comprises a coarse crusher (31) and a fine crusher (32), and the sand conveying equipment is connected with the sand screening equipment (6) and the coarse crusher (31) and the sand screening equipment (6) and the fine crusher (32).

6. The machine-made sand production apparatus for concrete according to claim 5, characterized in that: the sand screening equipment (6) is a multi-stage vibration type sand screening machine and comprises a machine shell (61), a feeding hole (62) formed in the machine shell (61), a first-stage screen (63) and a second-stage screen (64) arranged below the feeding hole (62), wherein the meshes of the second-stage screen (64) are smaller than those of the first-stage screen (63), a coarse sand outlet (65) is formed in one side of the first-stage screen (63), a finished sand outlet (66) is formed in one side of the second-stage screen (64), and a stone powder outlet (67) is formed below the second-stage screen (64); grit transmission device (4) is including locating coarse crusher (31) with screw conveyer (41) between the multistage vibrations formula sand sieving machine with locate multistage vibrations formula sand sieving machine with coarse sand conveyer belt (42) and fine sand conveyer belt (43) between fine crusher (32), coarse sand conveyer belt (42) are followed coarse sand export (65) are connected to feed inlet (62) of fine crusher (32), fine sand conveyer belt (43) are followed the sand mouth that goes out of fine crusher (32) is connected to feed inlet (62) of sand sieving equipment (6).

7. The machine-made sand production apparatus for concrete according to claim 6, characterized in that: still include stoving mechanism (5), stoving mechanism (5) are followed grit transmission device (4) set up.

8. The machine-made sand production apparatus for concrete according to claim 7, characterized in that: the conveying cylinder of the spiral conveyor (41) is a double-layer cylinder, the drying mechanism (5) comprises a steam generating device (51), a steam pipe (52) connected to the steam generating device (51), a steam inlet (53) and a steam outlet (54) arranged on the outer wall of the conveying cylinder, and the steam pipe (52) is connected to the steam inlet (53).

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