A high-efficiency sand making building including a closed-circuit wind screening system

Abstract

A high-efficiency sand-making building including a closed-circuit circulating wind screening system comprises a rigid building body with multi-layer platforms, and also comprises a silo, an elevator, an impact crusher, an air separation and dust removal device, a sealed screening device and a conveying device arranged in the rigid building body, the upper end of the elevator is connected to the impact crusher through the conveying device, the discharge port at the lower end of the impact crusher is connected to the air separation and dust removal device of the lower layer, the air separation and dust removal device is sealedly connected to the sealed screening device of the lower layer, and a coarse material end and a fine material end are provided on the sealed screening device; the core equipment is a closed-circuit circulating wind structure, an air separation and dust removal device and a sealed screening device, the closed-circuit circulating wind structure can effectively reduce energy consumption and pollution to the environment, and improve the sorting effect; the sorting and dust removal device can be beneficial to adjusting the modulus of the fine particle size of machine-made sand and reducing the load of subsequent screening equipment; the sealed screening device can control the grading particles of machine-made sand; the height of the sand-making building can be reduced, and the vibration of the entire sand-making building can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel aggregate production, and in particular to a high-efficiency sand making building including a closed-circuit circulating wind screening system. Background Art

[0002] With the continuous development of my country's economy, various large-scale construction projects have gradually increased, and the performance requirements for concrete are getting higher and higher. Sand and gravel, as the raw material with the highest proportion in concrete, have a direct impact on the workability, mechanics and durability of high-performance concrete. In existing major projects, almost all important structures require high-performance concrete, and the sand for high-performance concrete must be natural sand to ensure its performance. As a non-renewable resource, natural sand is facing depletion. The mining of natural sand has caused serious damage to the environment and brought about a series of environmental problems. The use of high-quality fine sand instead of natural sand to prepare concrete has become an important requirement and trend for social development.

[0003] The fine sand and gravel aggregate production system (i.e. fine machine-made sand production line) can produce the required fine sand and gravel or fine sand in proportion according to the needs and requirements of the concrete mix ratio and the mortar mix ratio. Its sand making process includes: the vibrating feeder transports the stone to the sand making machine for crushing and sand making; the part that meets the particle size requirements after dust removal and screening is the finished sand, and the part that does not meet the particle size requirements re-enters the sand making machine for crushing again. The machine-made sand has a uniform distribution of particle size and stable gradation, and the particle size can be adjusted according to the aggregate requirements of the dry-mixed mortar; the finished sand produced has no mud content, the powder content is adjustable and controllable, and some fine powder can replace part of the cement. The existing sand making building has the following disadvantages: many equipment, high power, large investment, large floor space, strict requirements on raw materials, weak processing capacity, the stone powder ratio contained in the machine-made sand is not easy to control, and the dust removal cost is high; in the crushing process, due to the low screening efficiency and accuracy before, the waste of resources is caused. In addition, the dust generated in the sand making process is extremely polluting to the environment, which is not conducive to environmental governance and the health of the staff.

[0004] Therefore, an efficient sand making building including a closed-circuit wind screening system is needed to solve this problem. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a high-efficiency sand making building including a closed-circuit wind screening system, which effectively solves the above problems.

[0006] The technical solution is that the present invention comprises a rigid building with multi-layer platforms, and also comprises a silo, an elevator, an impact crusher, an air separation and dust removal device, a sealed screening device and a conveying device arranged in the rigid building, the silo is connected to the lower end of the elevator through the conveying device, the upper end of the elevator is connected to the impact crusher through the conveying device, the discharge port at the lower end of the impact crusher is connected to the air separation and dust removal device at the lower layer, the air separation and dust removal device is sealedly connected to the sealed screening device at the lower layer, the sealed screening device is provided with a coarse material end and a fine material end, the coarse material end is connected to the lower end of the elevator, and the fine material end is connected to a wet mixer arranged at the lower layer of the sealed screening device;

[0007] The air separation and dust removal device includes an air separation chamber, a circulating centrifugal fan, a sand and gravel separator and a dynamic powder selector. The upper end of the air separation chamber is connected to the discharge port of the impact crusher, the left end of the air separation chamber is connected to the circulating centrifugal fan, the upper right end of the air separation chamber is connected to the sand and gravel separator, the lower end of the sand and gravel separator is connected to the fine material end of the sealed screening device through a conveying device, the dynamic powder selector is arranged on the upper side of the sand and gravel separator, the feed port of the dynamic powder selector is connected to the discharge port of the sand and gravel separator, the air outlet on the dynamic powder selector is connected to the circulating centrifugal fan through a pipeline, so that the air separation chamber, the circulating centrifugal fan, the sand and gravel separator and the dynamic powder selector form a closed gas closed-loop circulation, and the discharge port at the lower end of the air separation chamber is connected to the feed port of the sealed screening device.

[0008] The beneficial effects of the present invention are as follows: the core equipment of the present invention is a closed-circuit circulating air structure, an air separation and dust removal device and a sealed screening device. The closed-circuit circulating air structure can effectively reduce energy consumption and environmental pollution, and improve the sorting effect; the sorting and dust removal device can be beneficial to adjusting the modulus of the fine particle size of the machine-made sand and reducing the load of the subsequent screening equipment; the sealed screening device can control the grading particles of the machine-made sand; the present invention occupies less space than the equipment used in the original system and can reduce the height of the sand-making building. In addition, placing the sealed screening device on the lower floor can reduce the vibration of the entire sand-making building, reduce the dynamic load, provide the equipment with normal working stability, and at the same time can adjust the content of fine sand and achieve the rationality of the grading of the machine-made sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the present invention.

[0010] Figure 2 It is a structural schematic diagram of the horizontal vibrating screen of the present invention. DETAILED DESCRIPTION

[0011] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0012] Example:

[0013] Depend on Figure 1 to Figure 2The present invention comprises a rigid building with multi-layer platforms, and also comprises a silo 1, an elevator 2, an impact crusher 3, an air separation and dust removal device, a sealed screening device and a conveying device arranged in the rigid building. The silo 1 is connected to the lower end of the elevator 2 through the conveying device. The silo 1 and the elevator 2 are a buffer silo and a bucket elevator respectively. The impact crusher 3 is a vertical shaft impact crusher. The upper end of the elevator 2 is connected to the impact crusher 3 through the conveying device, that is, the elevator 2 lifts the material sent out of the silo 1 to a high place and sends it into the impact crusher 3 for crushing. The discharge port at the lower end of the impact crusher 3 is connected to the air separation and dust removal device at the lower layer. The crushed stone is de-dusted by the wind separation and dust removal device, and the wind separation and dust removal device is sealed and connected to the sealed screening device at the lower layer, that is, the stone after de-dusting is screened by the sealed screening device, and the sealed screening device is provided with a coarse material end and a fine material end, the coarse material end is connected to the lower end of the elevator 2, and the fine material end is connected to the wet mixer 27 arranged at the lower layer of the sealed screening device, so that the material with too large particle size screened out is sent to the lower end of the elevator 2 through the coarse material end for re-crushing, and the stone with qualified particle size screened out is sent to the wet mixer 27 through the fine material end for humidification and dust removal, so as to improve the quality of the stone;

[0014] The wind separation and dust removal device comprises an air selection chamber 4, a circulating centrifugal fan 5, a sand and gravel separator 6 and a dynamic powder selector 7. The upper end of the air selection chamber 4 is connected to the discharge port of the impact crusher 3, the left end of the air selection chamber 4 is connected to the circulating centrifugal fan 5, and the upper right end of the air selection chamber 4 is connected to the sand and gravel separator 6. Under the action of the centrifugal fan, the heavier stones entering the wind selection chamber continue to fall, while the lighter stones and dust are sent into the sand and gravel separator 6 by the air flow. The lower end of the sand and gravel separator 6 is connected to the fine material end of the sealed screening device through a conveying device. The dynamic powder selector 7 is arranged on the upper side of the sand and gravel separator 6, and the feed port of the dynamic powder selector 7 is connected to the discharge port of the sand and gravel separator 6. Then, the stone and dust entering the sand and gravel separator 6 are separated in the sand and gravel separator 6, the stone is sent to the sealed screening device through the conveying device for screening or collection, the dust enters the dynamic powder classifier for dust collection, and the air outlet on the dynamic powder classifier 7 is connected with the circulating centrifugal fan 5 through a pipeline, and the air flow after the dust is collected by the dynamic powder classifier 7 re-enters the circulating centrifugal fan 5, so that the air selection chamber 4, the circulating centrifugal fan 5, the sand and gravel separator 6 and the dynamic powder classifier 7 form a closed gas closed-loop circulation, which can effectively reduce the consumption of the circulating centrifugal fan 5 and avoid air pollution. The discharge port at the lower end of the air selection chamber 4 is connected to the feed port of the sealed screening device.

[0015] It also includes a dust removal device, which is a pulse bag dust collector 8. The air outlet of the pulse bag dust collector 8 is connected to the impact crusher 3. The pulse bag dust collector 8 is connected to a dust removal fan 9, which can collect the dust generated and flying in the impact crusher 3 due to crushing.

[0016] The lower end of the sand and gravel separator 6 is also connected to the chain conveyor 10, and the chain conveyor 10 is connected to a powder collecting device. The powder collecting device can be a collecting bin, a collecting hopper or a collecting box to collect the powder.

[0017] The fine material end is also connected to a belt conveyor 11, and a material collection pile is provided at the end of the belt conveyor 11. In the case that the stone does not need to be humidified and stirred, the material can be piled and collected through the belt conveyor 11.

[0018] The conveying device includes a quantitative belt feeder 12 connecting the elevator 2 and the silo 1, a fully sealed belt conveyor 13 connecting the elevator 2 and the impact crusher 3, and a screw conveyor 14 connecting the sand and gravel separator 6 and the fine material end on the sealed screening device.

[0019] The sealed screening device comprises a horizontal vibrating screen body 15, a sealing cover 16 is installed on the upper side of the horizontal vibrating screen body 15, a first screen 17 and a second screen 18 are installed in the horizontal vibrating screen body 15, an empty slot is provided between the right end of the first screen 17 and the feed port, so that the feed port on the horizontal vibrating screen body 15 is connected to the second screen 18, and a discharge chamber 19 is provided at the left end of the horizontal vibrating screen body 15, and a first discharge port 20 connected to the first screen 17 and a second discharge port 21 connected to the second screen 18 are provided in the discharge chamber 19, so that the materials entering the horizontal vibrating screen body 15 are screened simultaneously through the first screen 17 and the second screen 18 respectively. The medium material after being screened by the first screen 17 falls on the second screen 18 for a second screening, and the coarse material after being screened by the first screen 17 is discharged through the first discharge port 20. The second screen 18 screens the raw material directly falling on the second screen 18 and the medium material after the first screening, so that the fine material therein falls and is discharged through the second screen 18, and the remaining coarse material and medium material are discharged through the second discharge port 21. A collecting hopper 22 is also provided at the lower end of the horizontal vibrating screen body 15, which can collect the fine material. The end of the screw conveyor 14 extends into the collecting hopper 22, so that the fine material separated by sand and gravel enters the collecting hopper 22 for collection.

[0020] The coarse material end is a first pipe 23 connected to the lower end of the elevator 2 at one end and to the first discharge port 20 and the second discharge port 21 at the other end. The first pipe 23 feeds the coarse material discharged from the first discharge port 20 and the coarse material and medium material discharged from the second discharge port 21 to the elevator 2 so that they can be crushed again. The fine material end includes a receiving hopper 22 and a second pipe 24 and a third pipe 25 connected to the lower end of the receiving hopper 22. The second pipe 24 is connected to the belt conveyor 11, and the third pipe 25 is connected to the wet mixer 27. The second pipe 24 and the third pipe 25 are also provided with a dividing valve, which can select the second pipe 24 or the third pipe 25 to be connected to the receiving hopper 22. In addition, the first pipe 23, the second pipe 24 and the third pipe 25 combined with the sealing cover 16 can maintain the sealing inside the horizontal vibrating screen body 15.

[0021] A cyclone dust collector 26 is also provided between the air outlet on the dynamic powder selector 7 and the circulating centrifugal fan 5 .

[0022] When the present invention is in use, the raw materials in the buffer silo are conveyed to the bucket elevator through the quantitative belt feeder, and the raw materials are transported to the impact crusher for crushing by the bucket elevator. The crushed stones are de-dusted by the air separation dust removal device, and then enter the sealed screening device for screening. The finished fine materials are entered into the wet mixer 27 or are carefully piled up and collected.

[0023] The beneficial effects of the present invention are as follows: the core equipment of the present invention is a closed-circuit circulating air structure, an air separation and dust removal device and a sealed screening device. The closed-circuit circulating air structure can effectively reduce energy consumption and environmental pollution, and improve the sorting effect; the sorting and dust removal device can be beneficial to adjusting the modulus of the fine particle size of the machine-made sand and reducing the load of the subsequent screening equipment; the sealed screening device can control the grading particles of the machine-made sand; the present invention occupies less space than the equipment used in the original system and can reduce the height of the sand-making building. In addition, placing the sealed screening device on the lower floor can reduce the vibration of the entire sand-making building, reduce the dynamic load, provide the equipment with normal working stability, and at the same time can adjust the content of fine sand and achieve the rationality of the grading of the machine-made sand.

[0024] The above-mentioned specific implementation modes / embodiments are specific implementation modes of the present invention, which are used to illustrate the concept of the present invention, are explanatory and exemplary, and should not be interpreted as limiting the implementation modes of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application. These technical solutions include technical solutions that adopt any obvious replacements and modifications to the embodiments described herein, which are within the scope of protection of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An efficient sand making building including a closed-circuit wind screening system, comprising a rigid building body with multi-layer platforms, characterized in that: It also includes a silo (1), an elevator (2), an impact crusher (3), an air separation and dust removal device, a sealed screening device and a conveying device arranged in a rigid building body, the silo (1) is connected to the lower end of the elevator (2) through the conveying device, the upper end of the elevator (2) is connected to the impact crusher (3) through the conveying device, the discharge port at the lower end of the impact crusher (3) is connected to the air separation and dust removal device at the lower layer, the air separation and dust removal device is sealedly connected to the sealed screening device at the lower layer, the sealed screening device is provided with a coarse material end and a fine material end, the coarse material end is connected to the lower end of the elevator (2), and the fine material end is connected to a wet mixer (27) arranged at the lower layer of the sealed screening device; The air separation and dust removal device comprises an air separation chamber (4), a circulating centrifugal fan (5), a sand and gravel separator (6) and a dynamic powder selector (7). The upper end of the air separation chamber (4) is connected to the discharge port of the impact crusher (3), the left end of the air separation chamber (4) is connected to the circulating centrifugal fan (5), the upper right end of the air separation chamber (4) is connected to the sand and gravel separator (6), the lower end of the sand and gravel separator (6) is connected to the fine material end of the sealed screening device through a conveying device, and the dynamic powder selector (7) is connected to the fine material end of the sealed screening device through a conveying device. The powder selector (7) is arranged on the upper side of the sand and gravel separator (6); the feed port of the dynamic powder selector (7) is connected to the discharge port of the sand and gravel separator (6); the air outlet on the dynamic powder selector (7) is connected to the circulating centrifugal fan (5) through a pipeline, so that the air selection chamber (4), the circulating centrifugal fan (5), the sand and gravel separator (6) and the dynamic powder selector (7) form a closed gas closed-loop circulation; the discharge port at the lower end of the air selection chamber (4) is connected to the feed port of the sealed screening device; It also includes a dust removal device, which is a pulse bag dust collector (8), the air outlet of the pulse bag dust collector (8) is connected to the impact crusher (3), and the pulse bag dust collector (8) is connected to a dust removal fan (9); The lower end of the sand and gravel separator (6) is also connected to a chain conveyor (10), and the chain conveyor (10) is connected to a powder collecting device; The conveying device comprises a quantitative belt feeder (12) connecting the elevator (2) and the silo (1), a fully sealed belt conveyor (13) connecting the elevator (2) and the impact crusher (3), and a screw conveyor (14) connecting the sand and gravel separator (6) and the fine material end of the sealed screening device. A cyclone dust collector (26) is also provided between the air outlet on the dynamic powder selector (7) and the circulating centrifugal fan (5).

2. The high-efficiency sand making building including a closed-circuit wind screening system according to claim 1 is characterized in that: The fine material end is also connected to a belt conveyor (11), and a material collection pile is provided at the end of the belt conveyor (11).

3. The high-efficiency sand making building including a closed-circuit wind screening system according to claim 1 is characterized in that: The sealed screening device comprises a horizontal vibrating screen body (15), a sealing cover (16) is installed on the upper side of the horizontal vibrating screen body (15), a first screen (17) and a second screen (18) are installed in the horizontal vibrating screen body (15), an empty slot is provided between the right end of the first screen (17) and the feed port, a discharge chamber (19) is provided at the left end of the horizontal vibrating screen body (15), a first discharge port (20) connected to the first screen (17) and a second discharge port (21) connected to the second screen (18) are provided in the discharge chamber (19), and a receiving hopper (22) is also provided at the lower end of the horizontal vibrating screen body (15).

4. The high-efficiency sand making building including a closed-circuit wind screening system according to claim 3 is characterized in that: The coarse material end is a first pipe (23) having one end connected to the lower end of the elevator (2) and the other end connected to the first discharge port (20) and the second discharge port (21); the fine material end comprises a receiving hopper (22) and a second pipe (24) and a third pipe (25) connected to the lower end of the receiving hopper (22); the second pipe (24) is connected to the belt conveyor (11), and the third pipe (25) is connected to the wet mixer (27).

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