CN112495800B - Composite screening device for desert sand - Google Patents

Abstract

The invention discloses a composite screening device for desert sand, which relates to the technical field of sand screening and comprises a primary centrifugal screening component, a secondary air blowing screening component and a secondary centrifugal screening component, wherein the secondary air blowing screening component and the secondary centrifugal screening component are communicated with an outlet of the primary centrifugal screening component; one-level centrifugal screening subassembly carries out coarse screening with the desert sand, separate big particle diameter and small particle diameter desert sand earlier, desert sand rethread second grade blast screen subassembly and second grade centrifugal screening subassembly after the coarse screening carry out fine screening, finally separate out a plurality of kinds of sand material by big to little different particle diameters, can make the different sand material that finally obtain correspond different user modes and use, this device is exclusively used in and separates the desert sand, make the separation of desert sand abundant relatively, can not influence the use value of desert sand because of the screening reason.

Description

Composite screening device for desert sand

Technical Field

The invention relates to the technical field of sand screening, in particular to a composite screening device for desert sand.

Background

At present, sand used in construction projects in most areas of China is still river sand, and due to the increase of demand, the river sand is exploited in excess for many years, the ecological environment of a river channel and the safety of the river channel are overwhelmed, and resources are nearly exhausted. Nowadays, desertified land in China reaches 18.12 percent of the area of the national soil, about 170 ten thousand square kilometers, and in areas with rich desert sand resources, a large amount of extra-fine sand resources are possessed, so that the desert sand has profound significance in the building industry for meeting the requirements of sustainable development and environmental protection. However, the average grain size of the desert sand is small, usually between 0.13mm and 0.315mm, the grinding roundness is low, and the sand needs to be screened to select sand grains meeting the preparation requirement of concrete.

The material sorting method commonly used in the existing engineering mainly comprises a sieving method and a water sorting method. The sieving method is the most common method for classifying the particle size of the sediment and is suitable for separating materials with larger particle size; the water separation method is based on the principle that sand and water are mixed in a water tank, soil and fine powder in the sand are dissolved in the water, and then the sand is fished out of the water tank, so that the separation of the sand and the soil is realized, and the water separation method is suitable for removing the soil in the sand. In addition, no method or equipment special for separating the sand with multiple particle sizes exists, so that the sand cannot be fully separated, and the use value of the sand is influenced.

Disclosure of Invention

The invention aims to: in order to solve the problems, the composite screening device for the desert sand is provided, which can relatively and fully separate the desert sand according to different particle sizes.

The technical scheme adopted by the invention is as follows:

a combined type screening device for desert sand screens the desert sand, which comprises a primary centrifugal screening component, a secondary air blowing screening component and a secondary centrifugal screening component, wherein the secondary air blowing screening component and the secondary centrifugal screening component are communicated with an outlet of the primary centrifugal screening component; the first-stage centrifugal screening component is used for roughly screening the desert sand according to the particle size; and the secondary air blowing screen subassembly and the secondary centrifugal screen subassembly are used for secondarily screening the coarsely screened desert sand into sand materials with a plurality of particle sizes.

Preferably, the first-stage centrifugal screening subassembly includes a first-stage inner screen section of thick bamboo, drive a first-stage inner screen section of thick bamboo axial pivoted one-stage driver, the cover is established on a first-stage inner screen section of thick bamboo and fixed one-stage outer sleeve, a first-stage knockout drum that is located screen section of thick bamboo and one-stage outer sleeve under in one-stage, a screen section of thick bamboo is rotated with the one end of one-stage outer sleeve and is connected in the one-stage inner screen section of thick bamboo, open and its inside vertical one-stage division board that is provided with in one-stage knockout drum top, the two sides of one-stage division board enclose coarse sand material space and fine sand material space with the inner wall of one-stage knockout drum respectively, the export of a screen section of thick bamboo in the coarse sand material space alignment one-stage, the export of one-stage outer sleeve is aimed at to the fine sand material space.

Preferably, second grade blast screen subassembly is including the transition bin, the first sand silo of selection by winnowing, second sand silo, with the first sand silo divided sand volume control baffle of transition bin and selection by winnowing, be located the inside air-blower of the first sand silo of selection by winnowing, with the first sand silo of selection by winnowing and the screen board of second sand silo divided, the coarse sand material space intercommunication of transition bin and one-level knockout drum, the air outlet of air-blower is just to the screen board setting.

Preferably, the second-stage centrifugal screening component comprises a second-stage inner screen cylinder communicated with the fine sand space of the first-stage separation tank, a second-stage driver for driving the second-stage inner screen cylinder to axially rotate, a second-stage outer sleeve sleeved on the second-stage inner screen cylinder and fixed to the second-stage inner screen cylinder, a second-stage separation tank located right below the second-stage inner screen cylinder and the second-stage outer sleeve, the second-stage inner screen cylinder is rotatably connected with one end of the second-stage outer sleeve, the top of the second-stage separation tank is open, and a second-stage partition plate is longitudinally arranged in the second-stage separation tank, two faces of the second-stage partition plate and the inner wall of the second-stage separation tank respectively enclose a third sand space and a fourth sand space, the third sand space is aligned with the outlet of the second-stage inner screen cylinder, the fourth sand space is aligned with the outlet of the second-stage outer sleeve, the bottom of the third sand space of the second-stage separation tank is communicated with a third sand bin, and the bottom of the fourth sand space of the second-stage separation tank is communicated with a fourth sand bin.

Preferably, the composite screening device for the desert sand further comprises a detection and transportation assembly, the detection and transportation assembly comprises a laser particle size analyzer, a first sand material detection bin located under the first sand material bin with winnowing, a second sand material detection bin located under the second sand material bin, a third sand material detection bin located under the third sand material bin, a fourth sand material detection bin located under the fourth sand material bin, a first sand material conveyor belt located under the first sand material detection bin, a second sand material conveyor belt located under the second sand material detection bin, a third sand material conveyor belt located under the third sand material detection bin, and a fourth sand material conveyor belt located under the fourth sand material detection bin, and at least one laser particle size analyzer is arranged on the side wall of each of the first sand material detection bin, the second sand material detection bin, the third sand material detection bin and the fourth sand material detection bin.

Preferably, the primary driver is connected with the primary inner screen drum through a primary rotating shaft, and a primary vibrating machine is fixed on the primary rotating shaft; the second-stage driver is connected with the second-stage inner screen drum through a second-stage rotating shaft, and a second-stage vibrating machine is fixed on the second-stage rotating shaft.

Preferably, a first sand material weighing device is arranged at the bottom of the first sand material bin for air separation; a second sand material weighing device is arranged at the bottom of the second sand material bin; a third sand material weigher is arranged at the bottom of the third sand material bin; and a fourth sand material weighing device is arranged at the bottom of the fourth sand silo.

Preferably, the combined type screening device for the desert sand further comprises a box body, the primary centrifugal screening assembly, the secondary air blowing screening assembly, the secondary centrifugal screening assembly and the detection and transportation assembly are located inside the box body, and the moving wheels are arranged at the outer bottom of the box body.

Preferably, the composite screening device for the desert sand further comprises a feeding hole communicated with the first-stage inner screen cylinder, and the feeding hole is located outside the box body.

Preferably, the bottom that the first sand feed bin of selection by winnowing, second sand feed bin, third sand feed bin, fourth sand feed bin, first sand material detected the storehouse, second sand material detected the storehouse, third sand material detected the storehouse, fourth sand material detected the storehouse is provided with the bin gate that can open and shut respectively.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: one-level centrifugal screening subassembly carries out coarse screening with the desert sand, separate big particle diameter and small particle diameter desert sand earlier, desert sand rethread second grade blast screen subassembly and second grade centrifugal screening subassembly after the coarse screening carry out fine screening, finally separate out a plurality of kinds of sand material by big to little different particle diameters, can make the different sand material that finally obtain correspond different user modes and use, this device is exclusively used in and separates the desert sand, make the separation of desert sand abundant relatively, can not influence the use value of desert sand because of the screening reason.

Drawings

Fig. 1 is a plan perspective view of a composite screening device for desert sand.

FIG. 2 is a plan perspective view of a primary centrifugal screen assembly.

Fig. 3 is a plan perspective view of a secondary blower screen subassembly.

FIG. 4 is a plan perspective view of a secondary centrifugal screen assembly.

FIG. 5 is a plan perspective view of the inspection carriage assembly.

The labels in the figure are: a primary centrifugal screening component 1, a primary inner screen cylinder 11, a primary driver 12, a primary outer sleeve 13, a primary separation tank 14, a primary partition plate 141, a coarse sand space 142, a fine sand space 143, a primary rotating shaft 15, a primary vibrator 16, a secondary blowing screen component 2, a transition bin 21, an air separation first sand bin 22, a first sand weigher 221, a second sand bin 23, a second sand weigher 231, a sand amount control baffle 24, an air blower 25, a screen plate 26, a guide plate 27, a screen plate vibrator 28, a secondary centrifugal screening component 3, a secondary inner screen cylinder 31, a secondary driver 32, a secondary outer sleeve 33, a secondary separation tank 34, a secondary partition plate 341, a third sand space 342, a fourth sand space 343, a third sand bin 35, a third sand weigher 351, a fourth sand bin 36, a fourth sand weigher 361, a secondary rotating shaft 37, a secondary vibrator 38, a detection transportation component 4, a detection transportation component, The device comprises a laser particle analyzer 41, a first sand detection bin 42, a second sand detection bin 43, a third sand detection bin 44, a fourth sand detection bin 45, a first sand conveyor belt 46, a second sand conveyor belt 47, a third sand conveyor belt 48, a fourth sand conveyor belt 49, a box body 5, a moving wheel 51, a feeding port 6 and a controller 7.

Detailed Description

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

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a composite screening apparatus for desert sand, which is used for finally screening desert sand into sand materials with four particle sizes, comprises a primary centrifugal screening assembly 1, a secondary air blowing screen subassembly 2 communicated with an outlet of the primary centrifugal screening assembly 1, and a secondary centrifugal screening assembly 3; the first-stage centrifugal screening component 1 coarsely screens the desert sand into coarse sand materials and fine sand materials according to the particle size; the secondary blast screen subassembly 2 screens coarse sand into a first sand material and a second sand material, and the secondary centrifugal screen subassembly 3 screens fine sand into a third sand material and a fourth sand material.

Referring to fig. 2, further, the primary centrifugal screen assembly 1 includes a primary inner screen cylinder 11 horizontally disposed, a primary driver 12 driving the primary inner screen cylinder 11 to axially rotate, a primary outer sleeve 13 horizontally and fixedly disposed and sleeved on the primary inner screen cylinder 11, a primary separation tank 14 located right below the primary inner screen cylinder 11 and the primary outer sleeve 13, the primary inner screen cylinder 11 and the primary outer sleeve 13 are both cones, the vertexes of the two are rotatably connected, the bottom surfaces of the first-level driver and the second-level driver are parallel, the driving end of the first-level driver 12 is fixedly connected with the top point of the first-level inner screen cylinder 11, the top of the first-level separation tank 14 is open, a first-level partition plate 141 is longitudinally arranged in the first-level separation tank 14, two surfaces of the first-level partition plate 141 and the inner wall of the first-level separation tank 14 respectively enclose a coarse sand space 142 and a fine sand space 143, the coarse sand space 142 is aligned with the outlet of the first-level inner screen cylinder 11, and the fine sand space 143 is aligned with the outlet of the first-level outer sleeve 13.

Referring to fig. 3, further, the secondary air blowing sieve subassembly 2 includes a transition bin 21, a first air blowing bin 22, a second air blowing bin 23, a sand amount control baffle 24 separating the transition bin 21 from the first air blowing bin 22, an air blower 25 located inside the first air blowing bin 22, and a sieve plate 26 separating the first air blowing bin 22 from the second air blowing bin 23, the transition bin 21 is communicated with a coarse sand space 142 of the primary separating tank 14, the sand amount control baffle 24 can connect or separate the transition bin 21 from the first air blowing bin 22 in a rotating manner, the rotating sand amount control baffle 24 can control the sand amount of the transition bin 21 entering the first air blowing bin 22, the rotation of the sand amount control baffle 24 is driven by a baffle motor, and an air outlet of the air blower 25 is opposite to the sieve plate 26. The transition bin 21 and the first winnowing sand silo 22 are both provided with a guide plate 27 in series, so that the sand in the transition bin 21 can enter the first winnowing sand silo 22 along the guide plate 27. The air speed of the blower 25 is controlled to be 8-10 m/s. The screen deck 26 is provided at one end with a screen deck shaker 28.

Referring to fig. 4, further, the secondary centrifugal screen assembly 3 includes a secondary inner screen cylinder 31 communicated with the fine sand space 143 of the primary separating tank 14, a secondary driver 32 driving the secondary inner screen cylinder 31 to rotate axially, a secondary outer sleeve 33 fixed on the secondary inner screen cylinder 31, and a secondary separating tank 34 located right below the secondary inner screen cylinder 31 and the secondary outer sleeve 33, the secondary inner screen cylinder 31 and the secondary outer sleeve 33 are both horizontally arranged and are cones, the vertexes of the two are rotatably connected, the bottom surfaces of the two are parallel, the top of the secondary separating tank 34 is open and has a secondary partition plate 341 longitudinally arranged therein, two surfaces of the secondary partition plate 341 respectively enclose a third sand space 342 and a fourth sand space 343 with the inner wall of the secondary separating tank 34, the third sand space is aligned with the outlet of the secondary inner screen cylinder 31, the fourth sand space 343 is aligned with the outlet of the secondary outer sleeve 33, the bottom of the third sand space 342 of the secondary separation tank 34 is communicated with a third sand bin 35, and the bottom of the fourth sand space 343 of the secondary separation tank 34 is communicated with a fourth sand bin 36.

Referring to fig. 5, further, the composite screening apparatus for desert sand further includes a detection transportation assembly 4, which includes a laser particle size analyzer 41, a first sand detecting bin 42 located under the first sand bin 22, a second sand detecting bin 43 located under the second sand bin 23, a third sand detecting bin 44 located under the third sand bin 35, a fourth sand detecting bin 45 located under the fourth sand bin 36, a first sand conveyor 46 located under the first sand detecting bin 42, a second sand conveyor 47 located under the second sand detecting bin 43, a third sand conveyor 48 located under the third sand detecting bin 44, and a fourth sand conveyor 49 located under the fourth sand detecting bin 45, wherein the transportation directions of the first sand conveyor 46, the second sand conveyor 47, the third sand conveyor 48, and the fourth sand conveyor 49 are directions out of the screen in fig. 1, the side walls of the first sand material detection bin 42, the second sand material detection bin 43, the third sand material detection bin 44 and the fourth sand material detection bin 45 are at least provided with one laser particle size analyzer 41 which is respectively used for detecting the sand material particle sizes in the first sand material detection bin 42, the second sand material detection bin 43, the third sand material detection bin 44 and the fourth sand material detection bin 45.

Referring to fig. 1 to 3, further, the primary driver 12 is connected to the primary inner screen drum 11 through a primary rotating shaft 15, and a primary vibrator 16 is fixed on the primary rotating shaft 15; the secondary driver 32 is connected with the secondary inner screen drum 31 through a secondary rotating shaft 37, and a secondary vibrator 38 is fixed on the secondary rotating shaft 37. The primary vibrating machine 16 and the secondary vibrating machine 38 are used for enhancing the screening efficiency of the primary inner screen drum 11 and the secondary inner screen drum 31, and are also used for scattering massive sand materials in desert sand, so that screening is facilitated.

Referring to fig. 1, fig. 3 and fig. 4, further, a first sand weigher 221 is disposed at the bottom of the first sand silo 22; a second sand weigher 231 is arranged at the bottom of the second sand silo 23; a third sand weigher 351 is arranged at the bottom of the third sand silo 35; the bottom of the fourth sand silo 36 is provided with a fourth sand weigher 361. The device is used for weighing the sand material mass in the first sand silo 22, the second sand silo 23, the third sand silo 35 and the fourth sand silo 36.

Referring to fig. 1, further, the composite screening device for desert sand further includes a box 5, the primary centrifugal screening assembly 1, the secondary blast screen assembly 2, the secondary centrifugal screening assembly 3, and the detecting and transporting assembly 4 are all located inside the box 5, the outer bottom of the box 5 is provided with two moving wheels 51, and the two moving wheels 51 are folding hydraulic wheels.

Referring to fig. 1, further, the composite screening device for desert sand further comprises a feed inlet 6 communicated with the first-stage inner screen cylinder 11, wherein the feed inlet 6 is located outside the box body 5, so that the desert sand can conveniently enter the first-stage inner screen cylinder 11 from the feed inlet 6.

Further, the bottoms of the first sand silo 22, the second sand silo 23, the third sand silo 35, the fourth sand silo 36, the first sand detecting silo 42, the second sand detecting silo 43, the third sand detecting silo 44 and the fourth sand detecting silo 45 in winnowing are respectively provided with a silo door capable of being opened and closed, and the eight silo doors are respectively driven by eight silo door motors in opening and closing.

Further, the mesh aperture of the screen cloth is 0.16mm in the first grade, and the mesh aperture of sieve 26 is 0.25mm, and the mesh aperture of the screen cloth is 0.045mm in the second grade. The first sand material is medium sand with the particle size larger than 0.25mm, the second sand material is fine sand with the particle size of 0.25-0.16 mm, the third sand material is silt with the particle size of 0.16-0.045 mm, and the fourth sand material is micro powder with the particle size smaller than 0.045 mm.

Further, the primary driver 12 and the secondary driver 32 are both a combination of a motor and a current stabilizer.

Referring to fig. 1, further, the composite screening device for desert sand further includes a controller 7 fixed on the outer wall of the box 5, the controller 7 controls the opening and closing of the primary driver 12, the primary vibrator 16, the baffle motor, the blower 25, the screen plate vibrator 28, the secondary driver 32, the secondary vibrator 38, the laser particle size meter 41, the first sand conveyor 46, the second sand conveyor 47, the third sand conveyor 48, the fourth sand conveyor 49, and the bin gate motor, and receives and displays data detected by the first sand weigher 221, the second sand weigher 231, the third sand weigher 351, the fourth sand weigher 361, and the laser particle size meter 41. The baffle motor is stopped by controller 7 control intermittent type nature and is stopped, drives 24 intermittent type nature rotations of sand volume control baffle, and then makes the coarse sand material intermittent type nature in the transition bin 21 get into in the first sand silo 22 of selection by winnowing.

The device specifically uses the following steps and principles:

an operator opens the primary driver 12, the primary vibrator 16, the baffle motor, the blower 25, the screen plate vibrator 28, the secondary driver 32, the secondary vibrator 38, the laser particle size analyzer 41, the first sand conveyor belt 46, the second sand conveyor belt 47, the third sand conveyor belt 48 and the fourth sand conveyor belt 49 through the controller 7;

an operator pours the desert sand into the first-stage inner screen cylinder 11 from the feeding hole 6, the desert sand enters the first-stage inner screen cylinder 11, is driven to rotate by the first-stage inner screen cylinder 11 and generates centrifugal motion, and the desert sand with the particle size larger than 0.16mm is left in the first-stage inner screen cylinder 11 and slides to the coarse sand material space 142 of the first-stage separation tank 14 along the inner wall of the first-stage inner screen cylinder 11; desert sand with the particle size of less than 0.16mm passes through the sieve holes of the primary inner sieve barrel 11 to enter the primary outer sleeve 13 and slides into the fine sand material space 143 of the primary separation tank 14 along the inner wall of the primary outer sleeve 13;

coarse sand material in the coarse sand material space 142 of one-level knockout drum 14 gets into in the transition bin 21 to along guide plate 27 entering first sand silo 22 of selection by winnowing when sand volume control baffle 24 is opened, air-blower 25's wind blows coarse sand material to sieve 26 on, sieve 26 has sieve bobbing machine 28 to drive vibration cooperation air-blower 25 and sieves coarse sand material, the first sand material that the particle diameter is greater than 0.25mm is stayed in first sand silo 22 of selection by winnowing, the second sand material that the particle diameter is less than 0.25mm passes sieve mesh entering second sand silo 23 of sieve 26.

The fine sand in the fine sand space 143 of the primary separation tank 14 enters the secondary inner screen cylinder 31, is driven to rotate by the secondary inner screen cylinder 31 and generates centrifugal motion, and the third sand with the particle size larger than 0.045mm remains in the secondary inner screen cylinder 31, slides to the third sand space 342 of the secondary separation tank 34 along the inner wall of the primary inner screen cylinder 11 and then continuously moves into the third sand silo 35; the fourth sand with the particle size less than 0.045mm passes through the screen holes of the secondary inner screen drum 31 to enter the secondary outer sleeve 33, slides into the fourth sand space 343 of the secondary separation tank 34 along the inner wall of the secondary outer sleeve 33, and then moves into the fourth sand silo 36.

Data weighed by the first sand weigher 221, the second sand weigher 231, the third sand weigher 351 and the fourth sand weigher 361 are transmitted to the controller 7 in real time for display, an operator judges whether sand in the first sand silo 22, the second sand silo 23, the third sand silo 35 and the fourth sand silo 36 reaches a preset quality through the data, after the preset quality is reached, the operator controls a corresponding silo door motor to rotate forwards through the controller 7 to drive a corresponding silo door to be opened, and the corresponding sand in the corresponding sand silo passes through the corresponding silo door to fall into a corresponding sand detection silo; after the quality data displayed by the corresponding weighing devices in any one or more sand bins is less than the preset quality, an operator controls the corresponding bin gate motor to rotate reversely through the controller 7 to drive the corresponding bin gate to be closed.

The first sand silo 22 of selection by winnowing, second sand silo 23, third sand silo 35, the first sand material in the fourth sand silo 36, the second sand material, the third sand material, the fourth sand material falls into first sand material detection storehouse 42 respectively, second sand material detection storehouse 43, third sand material detection storehouse 44, the fourth sand material detects the back in the storehouse 45, the granularity that corresponds is detected to the laser particle size appearance 41 that corresponds, and show data transmission to controller 7, operating personnel judges sand material granularity according to this data and whether meets the requirements.

An operator controls a bin gate motor of the corresponding sand material detection bin to rotate forwards through the controller 7 according to the detection condition of the corresponding laser particle analyzer 41, so that the corresponding bin gate is driven to be opened, and the corresponding sand material falls onto the corresponding sand material conveying belt to be conveyed away.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to aid in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (6)

1. A combined type screening device for desert sand is characterized in that the desert sand is screened, and the device comprises a primary centrifugal screening component, a secondary air blowing screening component and a secondary centrifugal screening component, wherein the secondary air blowing screening component and the secondary centrifugal screening component are communicated with an outlet of the primary centrifugal screening component; the first-stage centrifugal screening component is used for roughly screening the desert sand according to the particle size; the secondary blast screen subassembly and the secondary centrifugal screen subassembly divide the coarsely screened desert sand into sand materials with a plurality of grain sizes through secondary fine screening;

the primary centrifugal screening component comprises a primary inner screen cylinder, a primary driver for driving the primary inner screen cylinder to axially rotate, a primary outer sleeve which is sleeved on and fixed on the primary inner screen cylinder, and a primary separation tank which is positioned right below the primary inner screen cylinder and the primary outer sleeve, wherein the primary inner screen cylinder is rotatably connected with one end of the primary outer sleeve, the top of the primary separation tank is open, and a primary partition plate is longitudinally arranged in the primary separation tank;

the secondary air blowing sieve subassembly comprises a transition bin, a first air blowing bin, a second air blowing bin, a sand quantity control baffle separating the transition bin from the first air blowing bin, an air blower positioned in the first air blowing bin and a sieve plate separating the first air blowing bin from the second air blowing bin, which are sequentially communicated, wherein the transition bin is communicated with a coarse sand space of the primary separation tank, and an air outlet of the air blower is opposite to the sieve plate;

the second-stage centrifugal screening component comprises a second-stage inner screen cylinder communicated with a fine sand space of the first-stage separation tank, a second-stage driver for driving the second-stage inner screen cylinder to axially rotate, a second-stage outer sleeve sleeved and fixed on the second-stage inner screen cylinder, and a second-stage separation tank located right below the second-stage inner screen cylinder and the second-stage outer sleeve, wherein the second-stage inner screen cylinder is rotatably connected with one end of the second-stage outer sleeve, the top of the second-stage separation tank is open, a second-stage partition plate is longitudinally arranged in the second-stage separation tank, two sides of the second-stage partition plate and the inner wall of the second-stage separation tank respectively define a third sand space and a fourth sand space, the third sand space is aligned with the outlet of the second-stage inner screen cylinder, the fourth sand space is aligned with the outlet of the second-stage outer sleeve, the bottom of the third sand space of the second-stage separation tank is communicated with a third sand bin, and the bottom of the fourth sand space of the second-stage separation tank is communicated with a fourth sand bin;

still including detecting the transportation subassembly, it includes laser particle size analyzer, be located the first sand material detection storehouse of selection by winnowing under the first sand silo, be located the second sand material detection storehouse under the second sand silo, be located the third sand material detection storehouse under the third sand silo, be located the fourth sand material detection storehouse under the fourth sand silo, be located the first sand material conveyer belt under the first sand material detection storehouse, be located the second sand material conveyer belt under the second sand material detection storehouse, be located the third sand material conveyer belt under the third sand material detection storehouse, be located the fourth sand material conveyer belt under the fourth sand material detection storehouse, first sand material detection storehouse, the second sand material detects the storehouse, the third sand material detects the storehouse, be provided with a laser particle size analyzer on the lateral wall of fourth sand material detection storehouse at least.

2. The composite screening device for desert sand as claimed in claim 1, wherein the primary driver is connected to the primary inner screen cylinder through a primary rotating shaft, and a primary vibrator is fixed to the primary rotating shaft; the second-stage driver is connected with the second-stage inner screen drum through a second-stage rotating shaft, and a second-stage vibrating machine is fixed on the second-stage rotating shaft.

3. The composite screening device for desert sand as claimed in claim 2, wherein the bottom of the first sand silo of air classification is provided with a first sand weigher; a second sand material weighing device is arranged at the bottom of the second sand material bin; a third sand material weigher is arranged at the bottom of the third sand material bin; and a fourth sand material weighing device is arranged at the bottom of the fourth sand silo.

4. The composite screening apparatus for desert sand as claimed in claim 3, further comprising a box body, wherein the primary centrifugal screening assembly, the secondary blower screening assembly, the secondary centrifugal screening assembly, the detecting and transporting assembly are all located inside the box body, and the moving wheels are arranged at the outer bottom of the box body.

5. The composite screening apparatus for desert sand as in claim 4, further comprising a feed inlet communicating with the primary inner screen cylinder, the feed inlet being located outside the box body.

6. The composite screening device for desert sand as claimed in claim 5, wherein the bottom of the first, second, third, fourth, first, second, third and fourth sand bin is provided with a door capable of opening and closing respectively.

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