A closed-circuit open-circuit complementary circulating air force screening process sand making building

Abstract

The application relates to a closed-circuit open-circuit complementary circulating air screening sand making process sand making building, which comprises a sand making machine, an air screening and screening unit, a blower, a fine sand recycler, a cyclone powder collector and a pulse dust collector. The air screening and screening machine of the air screening and screening unit comprises an air screening chamber, and a feeding port, an air inlet, a discharging port, a supplementary air inlet and two air outlets are arranged on the air screening chamber. The blower is communicated with the air inlet of the air screening chamber through an air inlet pipeline. One air outlet of the air screening chamber is communicated with the inlet of the fine sand recycler through a first pipeline. The air outlet of the fine sand recycler is communicated with the air inlet of the cyclone powder collector through a second pipeline. The air outlet of the cyclone powder collector is communicated with the air inlet of the blower through a third pipeline, forming a circulating channel. The other air outlet is communicated with the air inlet of the pulse dust collector through a fourth pipeline. The closed-circuit open-circuit complementary circulating air screening sand making process sand making building has the characteristics of flexible control of the air volume of the air screening and screening system, flexible regulation and control of the powder content of the finished sand, low equipment cost and low energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanism sand sampling, in particular to a closed-circuit open-circuit complementary circulating air screening process sand making building. BACKGROUND

[0002] With the continuous development of China's economy, various large-scale construction projects gradually increase, and the performance requirements of concrete are getting higher and higher, and sand, as the highest proportion of raw materials in concrete, directly affects the workability, mechanics and durability of high-performance concrete. In the current major projects, almost all important structures require high-performance concrete, and natural sand, as the main component of high-performance concrete, has been exhausted in decades of mining and utilization. At the same time, the mining of natural sand has caused serious damage to the environment and brought a series of environmental problems. Using high-quality mechanism sand to replace natural sand to prepare high-performance concrete has become an important requirement and trend of social development.

[0003] In the traditional building sand making process, the discharged material of the sand making equipment enters the screening unit, and the material entering the screening unit is air selected and gravity distributed by the air blower. After screening, the unqualified material is returned to the crushing unit for re-crushing, and the qualified material enters the finished product bin. The dust produced is removed by the dust removal pipeline into the dust remover, and the air meeting the emission standard is discharged into the atmosphere under the action of the induced draft fan. The whole process is operated under negative pressure under the action of the induced draft fan. In actual production, the air volume and air pressure of the air blower and the matching adjustment requirements of the dust remover are high and difficult, and the air volume of the air blower is prone to be too large, resulting in the disappearance of the system negative pressure; the air volume is too small, the material cannot be blown away, the large and small particles are not dispersed, and the screening and dust removal effects are affected. In addition, all the air needs to pass through the dust remover for filtration, resulting in a large filtration area of the dust remover, a large fan, a large occupied area and high equipment cost.

[0004] In the prior art, the utility model patent with publication number CN 210674672 U disclosed on June 5, 2020 discloses a closed circulating air system, which communicates the cyclone powder collector connected with the screening air separator with the pulse dust collector through a three-way pipeline, and communicates with the air blower through a circulating pipeline, so as to reduce the power of the dust remover, reduce the energy consumption, and reduce the load of the air blower. Its air flow chart is as follows Figure 1As shown, in actual use, there are the following disadvantages: 1) all the wind passes through the fine sand collector and the cyclone powder collector, and the wind entering the pulse dust collector needs to overcome a large resistance, needs to replace a larger negative pressure wind, and is more likely to carry more sand dust, the cyclone powder collector has a large dust removal pressure, the dust content in the circulating pipeline is high, and the long-time operation of the blower is not conducive; 2) the air volume of the air separator is inconvenient to adjust, for example, when the dust content in the finished sand needs to be adjusted, the blower and the dust collector need to be adjusted at the same time, on the one hand, the frequency and air volume of the blower and the dust collector are difficult to control, and the same problem as the matching adjustment of the air volume and air pressure of the blower and the dust collector in the traditional sand making building exists; on the other hand, the frequency change of the dust collector will affect the air volume of other dust removal points, and then affect the dust removal effect. SUMMARY

[0005] The purpose of the present application is to provide a closed-circuit open-circuit complementary circulating wind force screening process sand making building, which can flexibly control the air volume of the air separation screening system, flexibly adjust the dust content of the finished sand, and has the characteristics of low equipment cost and low energy consumption.

[0006] The present application is realized by the following technical scheme:

[0007] A closed-circuit open-circuit complementary circulating wind force screening process sand making building, comprising a sand making machine, an air separation screening unit, a blower, a fine sand collector, a cyclone powder collector and a pulse dust collector, the air separation screening unit comprising at least one air separation screening machine, the air separation screening machine comprising an air separation chamber, characterized in that: the air separation chamber is provided with a feeding port, an air inlet, a discharging port, a supplementary air inlet and two air outlets, the blower is communicated with the air inlet of the air separation chamber through an air inlet pipeline, one of the air outlets of the air separation chamber is communicated with the inlet of the fine sand collector through a first pipeline, the air outlet of the fine sand collector is communicated with the air inlet of the cyclone powder collector through a second pipeline, the air outlet of the cyclone powder collector is communicated with the air inlet of the blower through a third pipeline, forming a circulating channel, and the other air outlet is communicated with the air inlet of the pulse dust collector through a fourth pipeline.

[0008] Preferably, the air outlet of the air separation chamber connected with the first pipeline is farther away from the air inlet of the air separation chamber than the air outlet connected with the fourth pipeline.

[0009] A third air outlet is further provided on the air separation chamber, which is communicated with the air inlet pipeline at the air inlet through a circulating blower, forming a second circulating channel.

[0010] The third air outlet is located below the air inlet of the air separation chamber.

[0011] Valves are arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

[0012] The blower is preferably driven by a variable frequency motor or a frequency converter.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The air volume of the air separation and screening system can be more flexibly controlled, the air separation and screening efficiency is improved, the powder content of the finished sand is flexibly regulated, and the pulse dust collector and other dust removal points of the entire sand making building system are not affected.

[0015] The energy consumption of the negative pressure induced draft fan and the air blower is further reduced, the system power is reduced, and the hardware cost such as the filter area of the pulse dust collector is reduced.

[0016] The small-circulation second circulating air is formed by the small-power circulating fan, the air separation effect of large air volume and high air speed is still ensured in the case of reducing the energy consumption cost of the air blower, the material layer thickness distributed on the screen surface is more uniform, the material is more dispersed, the stone powder is more easily separated, and the stone powder is avoided from being sucked into the circulating system due to large air volume, and the burden of the fine sand recovery device and the cyclone powder collector is increased. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flow chart of the air path of the prior art;

[0018] Figure 2 is a process flow chart of the present application;

[0019] Figure 3 is a structural schematic diagram of the present application;

[0020] Figure 4 is a flow chart of the air path of the present application;

[0021] Figure 5 is a structural schematic diagram of the air separation and screening machine of the present application;

[0022] Figure 6 is another flow chart of the air path of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Embodiment one

[0024] Referring to Figures 2-5The closed-circuit open-circuit complementary circulating wind power screening sand making building comprises a sand making machine 1, a wind screening and screening unit 2, a blower 3, a fine sand collector 4, a cyclone powder collector 5 and a pulse dust collector 6. In the embodiment, the cyclone powder collector 5, the pulse dust collector 6 and the induced draft fan 7 are integrated in the powder dust collection system 9, which is not shown in the figure. The wind screening and screening unit 2 comprises at least one wind screening and screening machine. In the embodiment, one wind screening and screening machine is exemplarily illustrated, and two wind screening and screening machines are usually used in practical production. The wind screening and screening machine is correspondingly matched with a blower 3 to provide wind screening power. The wind screening and screening machine 2 comprises a wind screening chamber 21, which is provided with a feeding port 212, an air inlet 211, a first discharging port 218, a second discharging port 217, a supplementary air port 216, a first air outlet 214 and a second air outlet 213. The blower 3 is communicated with the air inlet 211 of the wind screening chamber 21 through an air inlet pipeline 31. The first air outlet 214 of the wind screening chamber 21 is communicated with the inlet of the fine sand collector 4 through a first pipeline. The air outlet of the fine sand collector 4 is communicated with the air inlet of the cyclone powder collector 5 through a second pipeline. The air outlet of the cyclone powder collector 5 is communicated with the air inlet of the blower 3 through a third pipeline 8 (i.e. a return air pipeline), forming a circulating channel. The second air outlet 213 of the wind screening chamber 21 is communicated with the air inlet of the pulse dust collector 6 through a fourth pipeline. The pulse dust collector discharges the dust-removed air through the induced draft fan 7. The first air outlet 214 of the wind screening chamber 21 connected with the first pipeline is farther away from the air inlet 211 of the wind screening chamber 21 than the second air outlet 213 connected with the fourth pipeline, so that the dust blown away by the air is conveniently introduced into the pulse dust collector 6 from the second air outlet 213, and at the same time, too much sand and dust are prevented from entering the first air outlet 214, thereby reducing the burden of the cyclone powder collector 5 and prolonging the service life of the blower 3. Valves are arranged on the first pipeline, the second pipeline, the third pipeline 8 and the fourth pipeline to control the air speed, air pressure and air volume of each pipeline. The blower 3 is preferably driven by a frequency conversion motor or a frequency converter.

[0025] The sand making building of the embodiment, the raw material is conveyed to the elevator by the feeding belt conveyor, and is crushed to make sand by the sand making machine 1. After sand making, the material enters the air separation and screening unit 2 for screening, and the qualified material is output from the first discharge port 218 of the air separation and screening machine to the humidifying system to obtain finished sand. The unqualified material is output to the return belt conveyor through the second discharge port 217, is lifted by the elevator, and is crushed again to make sand. At the air separation and screening machine, the air blower 3 blows air to the air inlet 211 of the air separation chamber 21 of the air separation and screening machine. The material entering the material inlet 212 is blown away by the air inlet 211, the stone powder is separated, the sand and gravel fall into the vibrating screen under the action of gravity for screening, and the blown-off dust is first collected in the pulse dust collector 6 at the second air outlet 213. Part of the fine sand and dust will pass through the second air outlet 213 to the first air outlet 214 under the action of inertia and air force, and is sucked into the fine sand recovery device 4 by negative pressure air force for fine sand recovery. The dust enters the cyclone dust collector 5 along with the circulating air flow for dust separation. The circulating air flow after dust separation is returned to the air blower 3 through the third pipeline 8, and then is blown into the air separation chamber 21 by the air blower 3 for stone powder separation.

[0026] The system divides the air flow into two paths in the air separation chamber 21. One path is directly dusted by the pulse dust collector 6 and discharged, which shortens the path, reduces the resistance, improves the dust removal efficiency, reduces the filter area of the pulse dust collector and the power consumption of the induced draft fan, and is also beneficial to guarantee the dust removal effect of other dust removal points. In addition, the problem of frequency and air volume matching of the air blower and the induced draft fan of the dust collector is also avoided. All the air speed and air volume matching can be stably matched in the air separation chamber 21 according to product requirements. The air volume control of the air separation and screening system is more flexible, which effectively guarantees and improves the air separation and screening efficiency, flexibly adjusts the powder content of the finished sand, and stabilizes the circulating air flow. The circulating air flow path will not be affected by the induced draft fan of the dust collector, which will cause the problem of increasing air volume and reducing negative pressure of the circulating air flow path. Embodiment two

[0027] Referring to Figure 5 and 6The difference between the embodiment and the embodiment one is that a third air outlet 215 is further arranged on the winnowing chamber 21, the air outlet 215 is communicated with the air inlet pipeline at the air inlet 211 through a circulating fan 10 to form a second circulating channel (small circulation), cooperates with the circulating air path (large circulation) in the embodiment one to form a large and small double circulating air screening process, and further improves the wind control flexibility of the winnowing screening system, when it is needed to change the screening air speed, only the size of the small circulation air volume needs to be adjusted to realize it. The third air outlet 215 is located below the air inlet 211 of the winnowing chamber to realize the direct circulation of the winnowing chamber 21 indoor and outdoor, supplements the air force of the air blower 3, can effectively reduce the power consumption cost of the air blower, makes the air blower pipeline always ensure the state of large air volume, and a part of air returns to the winnowing chamber 21 through the small circulation and will not enter the cyclone powder collector 5 and the pulse dust collector 6, so that the stone powder in the finished product will not be removed due to large air volume.

[0028] Taking a certain equipment model as an example:

[0029] Under the working condition of the prior art, the required system air volume is 100,000 m³ / h, the dust collector filtering area is 1880 m², and the induced draft fan power is 200 kW; the air blower is 2, and the power of each air blower is 37 kW; the total is 274 kW.

[0030] Under the working condition of the double circulating air of the application, the required system air volume is 100,000 m³ / h, the dust collector filtering area is 480 m², and the induced draft fan power is 55 kW; the air blower is 2, and the power of each air blower is 75 kW; the small circulation fan is 2, and the power of each small circulation fan is 15 kW; the total is 235 kW.

[0031] Under the working condition without circulating air, the air path running path is relatively long, the system resistance is large, and therefore the power is relatively large.

[0032] Under the working condition with circulating air, the air path running is divided into three paths, the negative pressure and the air of the system dust removal point directly enter the dust collector, the circulating air duct system resistance is about 40% smaller than the original system, and therefore the required power is smaller.

[0033] Finally, it should be noted that the above is only the preferred embodiment of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A closed-circuit open-circuit complementary circulating air screening sand making plant, comprising a sand making machine, an air screening and screening unit, a blower, a fine sand recovery device, a cyclone powder collector and a pulse dust collector, the air screening and screening unit comprising at least one air screening and screening machine, the air screening and screening machine comprising an air screening chamber, characterized in that: The air selection chamber is provided with a feeding port, an air inlet, a discharging port, a supplementary air inlet, a first air outlet and a second air outlet. The air blower is communicated with the air inlet of the air selection chamber through an air inlet pipeline. The first air outlet of the air selection chamber is communicated with the inlet of the fine sand collector through a first pipeline. The air outlet of the fine sand collector is communicated with the air inlet of the cyclone powder collector through a second pipeline. The air outlet of the cyclone powder collector is communicated with the air inlet of the air blower through a third pipeline, forming a circulation channel. The second air outlet of the air selection chamber is communicated with the air inlet of the pulse dust collector through a fourth pipeline. The air selection chamber is further provided with a third air outlet which is communicated with the air inlet pipeline at the air inlet through a circulating air blower, forming a second circulation channel.

2. The closed-circuit open-circuit complementary circulating wind power screening process sand making building according to claim 1, characterized in that: The air outlet connected with the first pipeline is farther away from the air inlet of the air selection chamber than the air outlet connected with the fourth pipeline.

3. The closed-circuit open-circuit complementary circulating wind power screening sand making building according to claim 1, characterized in that: The third air outlet is located below the air inlet of the air selection chamber.

4. The closed-circuit open-circuit complementary circulating wind power screening sand making building according to claim 1, characterized in that: Valves are arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline.

5. The closed-circuit open-circuit complementary circulating wind power screening sand making building according to claim 1, characterized in that: The air blower is driven by a frequency converter.

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