CN107344167A - Isolate centrifugal material screening grading technology and its special equipment - Google Patents
Isolate centrifugal material screening grading technology and its special equipment Download PDFInfo
- Publication number
- CN107344167A CN107344167A CN201610293019.9A CN201610293019A CN107344167A CN 107344167 A CN107344167 A CN 107344167A CN 201610293019 A CN201610293019 A CN 201610293019A CN 107344167 A CN107344167 A CN 107344167A
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- China
- Prior art keywords
- screen surface
- compass screen
- center
- sieve
- main shaft
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
Abstract
The present invention relates to one kind to isolate centrifugal material screening grading technology and its special equipment, by material being fed to barrel from sieve overcentre, uniformly it is fed by the helixes feed equipment of pan feeding cone top part to compass screen surface, material is left to after barrel, under gravity, uniform distributing is bored by pan feeding, fall to compass screen surface waterfall, first in the presence of segregation effect, different-grain diameter particle (r) is tentatively layered material, smaller particle is accumulated in around compass screen surface center, and bigger particle is further away from center；Simultaneously because radial grating gap B (screen slot) is outwards more and more wider from center, small particles material is sieved thoroughly by the relatively narrower screen slot close to centre first.The present invention produces centrifugal action using rotation and promotes material movement and separation, is more saved using vibratory drive material movement than simple, and more efficiently, finished product material separation grade is more flexible for screening adhesional wetting materiel, light materials.
Description
Technical field
The invention belongs to building castoff recycling, regrown material to apply with preparing key technology area；Tool
Body is related to the novel material sieving of a kind of classification applied to building castoff and reworked material treatment technology
Stage division and its device.
Background technology
In industrial departments such as metallurgy, coal, building materials, chemical industry and food processings, screening operation is a weight
The production link wanted, it need to largely use sieving machine.Dry screening operation be by material to expect equipped with sieve
On the screening machine in face, particle by projectile motion compared with sieve aperture after, less than the particle of screen size
The process sieved thoroughly.Currently conventional method for sieving be material by inclined compass screen surface (such as Fig. 1), vibrating
In the presence of power and gravity, material is layered and separated, larger particle rises to vibration material heap
Top, while less particle drops to the bottom of material heap by room；Screening materials carrying particle diameter and sieve screen apertures
Footpath is compared repeatedly, less than mesh size particle by screen cloth, the particle more than mesh size is retained in sieve
On the net, finally discharged from compass screen surface terminal.
Building castoff refer to building construction period and tear open broken concrete caused by the phase in old times, fragment of brick,
Debris, ceramic tile, glass, plastics, wood etc..In building construction process, every 10,000 square metres can produce
Raw 200 tons to 900 tons building castoffs；10,000 square metres of Old buildings are often removed, 7000 tons can be produced
To 13000 tons of building castoffs.Building is in the life cycles such as production of construction materials, construction, use, dismounting
42%, the 50% of the energy and material, the 48% of arable land of global water resources is consumed, it is dirty to global air and water
Accounting is contaminated up to 50%.In China's energy consumption structure, building energy consumption occupies 44.7%.According to statistics, in recent years
Between the total emission volumn of the annual building castoff in China is about 35.5 hundred million tons, the ratio of municipal refuse is accounted for about
For 40%, yield is surprising.Building castoff disposal of resources, building castoff 100% can be carried out again
Raw disposal, is building castoff treating method most excellent on our times.
Currently, in general processing mode is with purposes after the recovery of part building castoff：The brick of low value processed
(such as pavement bricks, landscape brick), concrete aerated brick.Returning for annual building castoff is caused with this
It is big to receive pending amount, and actual comprehensive utilization ratio is low, most of building castoff is also rested on by filling out
The quagmire that the mode of burying is handled.In fact, particle after building castoff is broken is more in small, broken bits, powdered, profit
Value is higher, for rear end building material product (such as concrete, the mortar, non-burning brick) quality prepared
Higher, the prefabricated component intensity of preparation is big.The present invention be used for building castoff removal process in Classification of materials,
Classification, has unique advantage especially for the separation of light materials and organic impurities in building castoff,
So as to realize the high efficiente callback of building castoff and recycling, and it is effectively guaranteed the product of reworked material
Matter.As shown in figure 1, the feed and vibration position between a to b occur for the layering of vibratory sieve point-score, at most
Particle separated between b to c, be layered and be basically completed between c to d, the separation of material repeatedly.
When grain diameter d ＞ 1.5a (a is mesh size), the particle hardly enters sieve aperture and participates in separation；
As grain diameter d ＜ 0.5a, the particle is easy to pass through screen cloth；As grain diameter 0.5a ＜ d ＜ 1.5a
When, the partial particulate is crucial separation particle, directly influences the yield and screening efficiency of screening machine.
When sieving moist or thin material, because being extremely difficult to preferable layered effect between material.Influence separation effect
The factor of fruit includes particle diameter composition, grain shape and the mesh form of material, as particle 0.5a ＜ d ＜ a
Be frequently necessary to by compare for several times attempt after could be by screen cloth, and a ＜ d ＜ 1.5a easily cause sieve
Net blocks.It is not suitable for moistening, sticky, hard and thin material dry deep-sizing.
The content of the invention
An object of the present invention is to solve the above problems, and proposes a kind of centrifugal material sieve of isolation
Divide grading technology, the centrifugal material screening grading technology of the isolation produces centrifugal action using rotation and promoted
Material movement and separation, more saved using vibratory drive material movement than simple, screening adhesional wetting materiel,
More efficiently, finished product material separation grade is more flexible for light materials.
The second object of the present invention is to solve the above problems, and proposes a kind of centrifugal material sieve of isolation
Divide the special equipment of grading technology, the special equipment of the centrifugal material screening grading technology of the isolation, which has, to be set
Meter science, rational in infrastructure, simple in construction, only individual layer circle compass screen surface, installation easy maintenance, screen cloth are not easy
The characteristics of blocking.
An object of the present invention is achieved through the following technical solutions：Isolate centrifugal material screening
Grading technology, it is characterised in that：By material being fed to barrel from sieve overcentre, bored by pan feeding
The helixes feed equipment at top is uniformly fed to compass screen surface, and material is left to after barrel, under gravity,
Uniform distributing is bored by pan feeding, is fallen to compass screen surface waterfall, material is first in the presence of segregation effect, different grains
Footpath particle (r) is tentatively layered, and smaller particle accumulated in around compass screen surface center, bigger particle further away from
Center；Simultaneously because radial grating gap B (screen slot) from center outwards more and more wider, small particle
Material is sieved thoroughly by the relatively narrower screen slot close to centre first, and bulky grain will not sieve thoroughly, more outside,
Bulky grain also can be sieved gradually thoroughly；Secondly, compass screen surface is rotation, and the material fallen on is by centrifugal force
Act on and being spread to compass screen surface surrounding, material gradually sieves thoroughly in diffusion process, therefore sieves material grade thoroughly along compass screen surface
Radial direction ordered arrangement, suitable aggregate device is set to realize the material of any particle diameter section below compass screen surface
Collect.Because compass screen surface is made up of radial direction grating, in the absence of the grating of circumferencial direction, and screen slot gradually broadens,
It is unobstructed in material movement, thus will not build up and block；If material movement is to compass screen surface most edge
Particle diameter is then discharged still greater than screen slot width from compass screen surface edge；Material is on compass screen surface in motion process, compass screen surface
Except rotary motion also has the forced vibration perpendicular to compass screen surface direction, the machine of material contact compass screen surface can be increased
Meeting, increases sieve probability thoroughly, and compass screen surface forced vibration is imitated for screening viscosity, moistening material, bulk light materials
Fruit is more obvious；Main shaft is driven using adjustable speed motor, any to change compass screen surface rotary speed, it is possible to achieve
The stepless change of material centrifugal motion speed, reach the purpose that material grade is sieved in adjustment thoroughly.
The second object of the present invention is achieved through the following technical solutions：Isolate centrifugal material screening
The special equipment of grading technology, it is characterised in that：The umbrella shape being made up of one section or multistage circular cone is sieved
The main shaft and the pan feeding cone composition positioned at compass screen surface overcentre of face and through its center；The umbrella shape compass screen surface
It is made up of some radial radiation shape gratings, the compass screen surface axis vertical is placed, and the main shaft is longitudinal from center
Pass through and be connected as one with compass screen surface；The pan feeding cone is coaxial with main shaft, and the pan feeding cone top sets spiral shell
Vane piece feeder, the helical blade feeder are connected as a single entity with pan feeding cone, can be with compass screen surface
Rotate；The umbrella shape compass screen surface lower frame is along the circumferential direction equipped with a number of vibrating motor, the umbrella
Shape compass screen surface, main shaft rotate under the driving of motor and reductor, while vibrating motor can drive umbrella shape to be sieved
Face is vibrated by certain frequency and amplitude；Some ring-type material collecting tanks are set below the umbrella shape compass screen surface, used
In collecting the material from compass screen surface transmission, the ring-type material collecting tank is using spindle axis as the center of circle, inside and outside footpath chi
Very little (R, R+ Δ R) to need the material grade stage size collected to determine, the ring-type material collecting tank is consolidated
Due to frame or ground；Discharging opening is set in the ring-type trench bottom correct position that gathers materials, each ring-type gathers materials
The scraper plate that gathers materials is installed, scraper plate is connected with main shaft, rotated with main shaft, will fall on ring-type material collecting tank in groove
Interior material scraper feed inlet and outlet, discharging opening lower section set passage to expect to guide；Sieve nest surrounding and top are set
Hermetically sealed dust gathering arrester is put, caused airborne dust and security protection can be played a part of in closed material screening；Collection
Dust hood top sets dust-collecting pipe, and airborne dust is guided and collected by external deduster.
This technique uses sieve nest forms of motion to be rotated plus vibrated with circumferential level and replaces single oscillating movement,
Screening efficiency is higher, energy consumption is lower, noise is smaller；Sieve material grade is arranged in order along compass screen surface radial direction thoroughly
Row, set suitable aggregate device to realize the material collection of any particle diameter section below compass screen surface, be suitable for certainly
Dynamic control；Compass screen surface rotating speed is stepless adjustable, and the material screening to any grade and collection can be achieved.
The umbrella shape compass screen surface that this special equipment is formed using one section or multistage circular cone；Screen cloth only has radially
Grating, no weft direction grating, and screen slot gap gradually expands along compass screen surface center to surrounding, material not by
Hinder, anti-blockage capability is strong, is adapted to the screening of dry and wet material；Using helical blade charging gear, feed
Uniformly, and with main shaft synchronous axial system, realize automatically adjusting for feeding coal；Sifted surface layer number only one
Layer, simple in construction, reliability is high, easy to maintenance；Totally-enclosed structure, dust control and noise absorption.
Brief description of the drawings
Fig. 1 is the layering of vibratory sieve point-score and separation process analysis chart；
The drive mechanism schematic diagram of Fig. 2 present invention；
The umbrella shape compass screen surface structural representation of Fig. 3 present invention；
The material screening channel design schematic diagram of Fig. 4 present invention；
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples：
Embodiment：Referring to accompanying drawing 1,2,3,4, centrifugal material screening grading technology is isolated, by material
Fed from sieve overcentre to barrel 4, the helixes feed equipment 3 by the top of pan feeding cone 2 is uniform
It is fed to compass screen surface, material is left to after barrel 4, under gravity, is uniformly divided by pan feeding cone 2
Material, falls, material is first in the presence of segregation effect, and different-grain diameter particle (r) is just to the waterfall of compass screen surface 1
Step layering, smaller particle are accumulated in around compass screen surface center, and bigger particle is further away from center；Simultaneously because
The radial gap B (screen slot) of grating 13 from center outwards it is more and more wider, small particles material first by by
The relatively narrower screen slot in nearly centre is sieved thoroughly, and bulky grain will not sieve thoroughly, more outside, and bulky grain also can be by
Gradually sieve thoroughly；Secondly, compass screen surface 1 is rotation, and the material fallen on is subject to centrifugal forces to compass screen surface
Surrounding spreads, and material gradually sieves thoroughly in diffusion process, therefore sieve material grade has along compass screen surface radial direction thoroughly
Sequence arranges, and sets suitable aggregate device to realize the material collection of any particle diameter section below compass screen surface.Due to
Compass screen surface is made up of radial direction grating, and in the absence of the grating of circumferencial direction, and screen slot gradually broadens, material movement
In it is unobstructed, thus will not build up and block；If material movement is still big to compass screen surface most edge particle diameter
In screen slot width, then discharged from compass screen surface edge；Material is on compass screen surface in motion process, and compass screen surface is except rotation
Motion also has the forced vibration perpendicular to compass screen surface direction, can increase the chance of material contact compass screen surface, and increase is saturating
Probability is sieved, compass screen surface forced vibration is more obvious for screening viscosity, moistening material, bulk light materials effect；
Main shaft 8 is driven using adjustable speed motor 9, any to change the rotary speed of compass screen surface 1, it is possible to achieve material from
The stepless change of heart movement velocity, reach the purpose that material grade is sieved in adjustment thoroughly.
The special equipment of centrifugal material screening grading technology is isolated, by one section or multistage circular cone group
Into umbrella shape compass screen surface 1 and through its center main shaft 8 and positioned at compass screen surface overcentre pan feeding bore 2 groups
Into；The umbrella shape compass screen surface is made up of some radial radiation shape gratings 13, and the axis vertical of compass screen surface 1 is put
Put, the main shaft 8 is connected as one from center longitudinally through and with compass screen surface 1；The pan feeding cone 2 and master
Axle 8 is coaxial, and the pan feeding bores 2 tops and sets helical blade feeder 3, the helical blade feed
Mechanism 3 is connected as a single entity with pan feeding cone 2, can be rotated with compass screen surface 1；Under the framework of umbrella shape compass screen surface 1
Portion is along the circumferential direction equipped with a number of vibrating motor 14, and the umbrella shape compass screen surface 1, main shaft 8 are in motor
9 and reductor 10 driving under rotate, while vibrating motor 14 can drive umbrella shape compass screen surface 1 by certain
Frequency and amplitude are vibrated；The lower section of umbrella shape compass screen surface 1 sets some ring-type material collecting tanks 7, for receiving
Collect the material passed through from compass screen surface 1, the ring-type material collecting tank 7 is using the axle center of main shaft 8 as the center of circle, inside and outside footpath
Size (R, R+ Δ R) is to need the material grade stage size collected to determine, the ring-type material collecting tank
7 are fixed on frame or ground；Discharging opening 11 is set in the bottom correct position of ring-type material collecting tank 7, each
The scraper plate 12 that gathers materials is installed in ring-type material collecting tank, scraper plate is connected with 12 main shafts 8, rotated with main shaft 8,
The material scraper feed inlet and outlet 11 that will be fallen in ring-type material collecting tank 7, discharging opening lower section set passage to lead material
Walk；Sieve nest surrounding and top set hermetically sealed dust gathering arrester 6, can in closed material screening caused airborne dust and
Play a part of security protection；Dust gathering arrester top set dust-collecting pipe 5, external deduster by airborne dust guide and
Collect.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate what the present invention was made
Citing, and the restriction not to embodiment.For those of ordinary skill in the field, upper
State it is bright on the basis of can also make other changes in different forms.There is no need and unable to right
All embodiments are exhaustive.And the obvious changes or variations thus extended out still in
Among protection scope of the present invention.
Claims (2)
1. one kind isolates centrifugal material screening grading technology, it is characterised in that：By material from sieve
It is square in the heart to be fed to barrel (4), helixes feed equipment (3) at the top of (2) is bored by pan feeding
Even to be fed to compass screen surface, material leaves to after barrel (4), under gravity, bored (2) by pan feeding
Uniform distributing, fall to compass screen surface (1) waterfall, material is first in the presence of segregation effect, different-grain diameter
Grain (r) is tentatively layered, and smaller particle is accumulated in around compass screen surface center, and bigger particle is further away from center；
Simultaneously because radial grating (13) gap B (screen slot) from center outwards more and more wider, small particle
Material is sieved thoroughly by the relatively narrower screen slot close to centre first, and bulky grain will not sieve thoroughly, more outside,
Bulky grain also can be sieved gradually thoroughly；Secondly, compass screen surface (1) be rotation, the material fallen on by from
The effect of mental and physical efforts is spread to compass screen surface surrounding, and material gradually sieves thoroughly in diffusion process, therefore sieve material grade thoroughly
Along compass screen surface radial direction ordered arrangement, suitable aggregate device is set to realize any particle diameter section below compass screen surface
Material collection.Because compass screen surface is made up of radial direction grating, in the absence of the grating of circumferencial direction, and screen slot by
Gradual change is wide, unobstructed in material movement, thus will not build up and block；Material movement is to compass screen surface
If most edge particle diameter is discharged still greater than screen slot width from compass screen surface edge；Material motion process on compass screen surface
In, compass screen surface also has the forced vibration perpendicular to compass screen surface direction except rotary motion, can increase material contact sieve
The chance in face, increases sieve probability thoroughly, and compass screen surface forced vibration is light for screening viscosity, moistening material, bulk
Material effect is more obvious；Main shaft (8) is driven using adjustable speed motor (9), arbitrarily changes compass screen surface (1)
Rotary speed, it is possible to achieve the stepless change of material centrifugal motion speed, reach adjustment sieve material grade thoroughly
Purpose.
A kind of 2. special equipment for isolating centrifugal material screening grading technology, it is characterised in that：By one
The umbrella shape compass screen surface (1) and the main shaft (8) of through its center and position of section or multistage circular cone composition
In pan feeding cone (2) composition of compass screen surface overcentre；The umbrella shape compass screen surface is by some radial radiation shape gratings
(13) form, compass screen surface (1) axis vertical is placed, the main shaft (8) from center longitudinally through
And it is connected as one with compass screen surface (1)；The pan feeding bores (2) and main shaft (8) coaxially, the pan feeding
Bore (2) top and helical blade feeder (3) is set, the helical blade feeder (3) is with entering
Material cone (2) is connected as a single entity, and can be rotated with compass screen surface (1)；Under umbrella shape compass screen surface (1) framework
Portion is along the circumferential direction equipped with a number of vibrating motor (14), the umbrella shape compass screen surface (1), main shaft (8)
Rotated under the driving of motor (9) and reductor (10), while vibrating motor (14) can drive
Umbrella shape compass screen surface (1) is vibrated by certain frequency and amplitude；The umbrella shape compass screen surface (1) is if lower section is set
Dry ring-type material collecting tank (7), for collecting the material passed through from compass screen surface (1), the ring-type material collecting tank (7)
Using main shaft (8) axle center as the center of circle, dimension of inner and outer diameters (R, R+ Δ R) is to need the material grain collected
Level stage size determines that the ring-type material collecting tank (7) is fixed on frame or ground；In ring-type collection
Hopper (7) bottom correct position sets discharging opening (11), and the scraper plate that gathers materials is installed in each ring-type material collecting tank
(12), scraper plate is connected with (12) main shaft (8), is rotated with main shaft (8), will fall on ring-type
Material scraper feed inlet and outlet (11) in material collecting tank (7), discharging opening lower section set passage to expect to guide；
Sieve nest surrounding and top set hermetically sealed dust gathering arrester (6), caused airborne dust and can rise in closed material screening
To the effect of security protection；Dust gathering arrester top set dust-collecting pipe (5), external deduster by airborne dust guide and
Collect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610293019.9A CN107344167A (en) | 2016-05-05 | 2016-05-05 | Isolate centrifugal material screening grading technology and its special equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610293019.9A CN107344167A (en) | 2016-05-05 | 2016-05-05 | Isolate centrifugal material screening grading technology and its special equipment |
Publications (1)
| Publication Number | Publication Date |
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| CN107344167A true CN107344167A (en) | 2017-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610293019.9A Pending CN107344167A (en) | 2016-05-05 | 2016-05-05 | Isolate centrifugal material screening grading technology and its special equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078840A (en) * | 2018-08-17 | 2018-12-25 | 安徽新网讯科技发展有限公司 | A kind of Supplying Sieving Mechanism and its operating method |
| CN109079150A (en) * | 2018-09-04 | 2018-12-25 | 江苏威拉里新材料科技有限公司 | A kind of horizontal atomizer of 3D printing metal powder production |
| CN110076083A (en) * | 2019-05-20 | 2019-08-02 | 高爱明 | A kind of spin vibration sieve feeding mechanism |
| CN111515116A (en) * | 2020-05-07 | 2020-08-11 | 西南科技大学 | Modified mineral screening dust collecting equipment |
| CN112517251A (en) * | 2020-11-13 | 2021-03-19 | 深圳市水务工程检测有限公司 | Centrifugal sand separating device |
| CN112934712A (en) * | 2021-01-26 | 2021-06-11 | 安徽金三隆再生资源有限公司 | Filter equipment is used in neodymium iron boron waste recycling |
| CN113171966A (en) * | 2021-05-10 | 2021-07-27 | 常州机电职业技术学院 | Centrifugal screening and grading device |
| CN113500191A (en) * | 2021-09-10 | 2021-10-15 | 西安欧中材料科技有限公司 | Method and device for preparing dual-performance powder turbine disc with continuously-changed crystal grains |
| CN114377956A (en) * | 2020-06-19 | 2022-04-22 | 长江师范学院 | Material sorting facilities pan feeding mouth structure is retrieved to lithium cell |
| CN114602800A (en) * | 2022-04-16 | 2022-06-10 | 沧州盛丰塑胶制品有限公司 | Raw material screening machine for plastic production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109078840A (en) * | 2018-08-17 | 2018-12-25 | 安徽新网讯科技发展有限公司 | A kind of Supplying Sieving Mechanism and its operating method |
| CN109079150A (en) * | 2018-09-04 | 2018-12-25 | 江苏威拉里新材料科技有限公司 | A kind of horizontal atomizer of 3D printing metal powder production |
| CN110076083A (en) * | 2019-05-20 | 2019-08-02 | 高爱明 | A kind of spin vibration sieve feeding mechanism |
| CN111515116A (en) * | 2020-05-07 | 2020-08-11 | 西南科技大学 | Modified mineral screening dust collecting equipment |
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