CN104492681A - Single-roller grate type effective screening device of coal conveying system - Google Patents
Single-roller grate type effective screening device of coal conveying system Download PDFInfo
- Publication number
- CN104492681A CN104492681A CN201510022650.0A CN201510022650A CN104492681A CN 104492681 A CN104492681 A CN 104492681A CN 201510022650 A CN201510022650 A CN 201510022650A CN 104492681 A CN104492681 A CN 104492681A
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- China
- Prior art keywords
- sweeper
- sieve nest
- casing
- main shaft
- screening device
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Classifications
-
- 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
- B07B1/12—Apparatus having only parallel elements
-
- 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
-
- 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
- B07B1/50—Cleaning
- B07B1/52—Cleaning with brushes or scrapers
- B07B1/522—Cleaning with brushes or scrapers with brushes
- B07B1/524—Cleaning with brushes or scrapers with brushes the brushes being rotating
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses a single-roller grate type effective screening device of a coal conveying system. The single-roller grate type effective screening device is composed of a box body, a screen body, a sweeper group, a traveling wheel, a traveling mechanism spindle and the like, the traveling wheel is arranged at the bottom of the box body, a feed hole is formed in the part of the box body opposite to an adhesive tape conveyor roller, the bottom of the box body is connected with the upper hole of a discharge hopper, the traveling wheel is in contact with a steel rail, the steel rail is arranged on supporting legs and connected through a steel rail press plate, and traveling mechanism bearing pedestals are fixed at the outer sides of the supporting legs of the steel rail; a traveling mechanism speed reducer is arranged on the traveling mechanism spindle, a traveling mechanism speed reducer moment arm is located on the supporting leg, the other ends of the supporting legs are fixed on the ground, the traveling mechanism spindle is provided with a gear, a rack is arranged at the lower end of the box body and oppositely engaged to the gear, and the traveling mechanism speed reducer has a self-lock locating function. The single-roller grate type effective screening device is capable of eliminating the bonding blockage and clamp blockage in the material screening process and featured with reasonable, simple and reliable structure, energy conservation, long service life and low use cost.
Description
Technical field
The present invention relates to a kind of sundry separating device for material-transporting system, be specially a kind of coal conveying system list roller grate formula high efficiency screening device, can be used for the removal of impurities of coal and other materials, screening.
Background technology
In coal course of conveying, have and be greater than the foreign material such as necessarily required gathering coal, ratchel, large wooden unit and polybag, careless bundle, rope class, above-mentioned substance, in course of conveying, will cause serious harm to conveying equipment, therefore, should be separated it in time and remove.The impurity removing equipment of current coal have roller type remove bulk device (also known as except three pieces, except large woodenware), the equipment such as the tooth-like miscellaneous object-removing equipment of rotary hook and grate formula compound Impurity separating machine, above-mentioned roller type except bulk device (also known as except three pieces, except large woodenware) there is easily stifled, deficiency that Yi Ka, energy consumption are high, there is easily winding in rotary hook tooth-like miscellaneous object-removing equipment equipment, sifting surface is little, screening efficiency is low, easily takes the drawbacks such as little material out of.
Summary of the invention
The object of this invention is to provide a kind of coal conveying system list roller grate formula high efficiency screening device, sticky stifled, the blocking problem in material screening process can be eradicated, have rational in infrastructure, simple and reliable, the feature that economize energy, long service life, reduction labour intensity and use cost are low; Also there is fault and automatically terminate function, when equipment break down need to safeguard time, remove operation by automatic or manual mode.
The object of the invention is to be achieved through the following technical solutions: coal conveying system list roller grate formula high efficiency screening device, screening plant is made up of casing, sieve nest, sweeper group and road wheel, walking mechanism main shaft etc., bottom half installed rows travelling wheel, casing and rubber conveyer cylinder opposite site are charging aperture, bottom half communicates with hopper is suitable for reading, road wheel and rail touch, and rail is arranged on supporting leg and is connected by rail pressing plate, and a leg outer side for rail fixes walking mechanism bearing block respectively; Walking mechanism reductor is arranged on walking mechanism main shaft, driving speed reducer moment arm is located on supporting leg, the supporting leg other end fixes on the ground, walking mechanism main shaft is provided with gear, tooth bar be arranged on casing lower end, relatively with gear to engage, walking mechanism reductor has lock-bit function; Described lower box two side box plate is provided with hole, and sieve nest rear cross beam axle is through the hole on casing, and the boxboard outer end that rear cross beam shaft extension goes out casing adopts pin to position.Sieve nest front beam and sieve nest rear cross beam and sieve nest needle beam synthesize sieve nest by several grating Connecting groups, and the two ends of sieve nest front beam mount with two extension spring lower ends respectively, and two extension spring upper ends mount with the extension spring upper pendant be welded on inside casing boxboard respectively; Outside installation shaft bearing in the middle part of described casing, main shaft reductor connects with main shaft, and the box house of main shaft divides, and installs axle sleeve, and welding many groups sweeper group on axle sleeve, sweeper group is welded on axle sleeve by multi-disc sweeper plate and forms.The shape of grating is become 13 °-30 ° skewed near the part of rubber conveyer cylinder.The other end is horizontal.Sweeper plate in sweeper group is more than a slice, and 3 to 6 is best, and every sheet press certain angle uniform welding and formed, sweeper group number and interval corresponding with the clearance space of grating, sweeper group is key, jackscrew, bearing pin with the connection of main shaft or welds.Sweeper plate is spline-like formations, multiple sweeper plate is installed on the axle sleeve on main shaft, be assembled into sweeper, the gap of sweeper plate and quantity corresponding by the gap of grating on sieve nest, the length of sweeper plate determines according to the length of sieve nest, and the Design of length of sweeper plate is between 500mm to 1200mm.Sieve nest is arranged on the middle below of casing, and the front end of sieve nest and oversize (foreign material) port of export, hang on sieve nest front beam by extension spring lower end, and extension spring upper end hangs in the extension spring upper pendant that is welded on inside casing boxboard.The length of grating is greater than the distance between main shaft and the compass screen surface of sieve nest.
The invention has the beneficial effects as follows: due to the present invention the material sent here by conveyer fall into be made up of on sieve nest many gratings arranged in parallel time, under the impact and Action of Gravity Field of material inertia, compass screen surface crossed by the material being less than grating gap, under falling into sieve, the material being greater than grating gap is called oversize (foreign material), is delayed on compass screen surface.Main shaft reductor drives the numerous sweeper plate be assembled on axis to rotate, and the oversize of detention on compass screen surface (foreign material) is released outside sieve by the sweeper plate of rotation, has carried out the removal of impurities screening task of material.The whole device structure of the present invention is simple, namely decreases equipment failure rate, reduces energy consumption, compass screen surface can not be caused again to block, ensure that the safe operation of induction system.When equipment break down need to safeguard time, remove operation by automatic or manual mode.
Accompanying drawing explanation
Fig. 1 is main TV structure schematic diagram of the present invention; Fig. 2 is the structure for amplifying schematic diagram of sieve nest in Fig. 1.Fig. 3 is main axle structure schematic diagram in Fig. 1, and Fig. 4 is sweeper list group structural representation in Fig. 1.Fig. 5 is sieve nest front view in Fig. 1; Fig. 6 is the top view of sieve nest in Fig. 5.
Detailed description of the invention
Coal conveying system list roller grate formula high efficiency screening device of the present invention, screening plant is made up of casing 4, sieve nest 26, sweeper group 27 and road wheel 12, walking mechanism main shaft 29 etc., installed rows travelling wheel 12 bottom casing 4, casing 4 and rubber conveyer cylinder 1 opposite site are charging aperture, communicate with hopper 23 is suitable for reading bottom casing 4, road wheel 12 and rail 14 touch, rail 14 is arranged on supporting leg 16 and is connected by rail pressing plate 17, fixes walking mechanism bearing block 15 respectively outside the supporting leg 16 of rail 14; Walking mechanism reductor 13 is arranged on walking mechanism main shaft 29, driving speed reducer moment arm 31 is located on supporting leg 16, supporting leg 16 other end fixes on the ground, walking mechanism main shaft 29 is provided with gear 18, tooth bar 19 be arranged on casing 4 lower end, relatively with gear 18 to engage, walking mechanism reductor 13 has lock-bit function; Described casing 4 bottom two side box plate is provided with hole, and sieve nest rear cross beam axle 22 is through the hole on casing 4, and the boxboard outer end that rear cross beam axle 22 stretches out casing 4 adopts pin to position.Sieve nest front beam 11 synthesizes sieve nest 26 with sieve nest rear cross beam 22 and sieve nest needle beam 24 by several grating 20 Connecting groups, the two ends of sieve nest front beam 11 mount with two extension spring 10 lower ends respectively, and two extension spring 10 upper ends mount with the extension spring upper pendant 9 be welded on inside casing 4 boxboard respectively; Outside installation shaft bearing 7 in the middle part of described casing 4, main shaft reductor 5 connects with main shaft 6, part in the casing 4 of main shaft 6, installs axle sleeve 28, and welding many groups sweeper group 27 on axle sleeve 28, sweeper group 27 is welded on axle sleeve 28 by multi-disc sweeper plate 8 and forms.The shape of grating 20 is become 13 °-30 ° skewed near the part of rubber conveyer cylinder 1.Grating 20 other end is horizontal.Sweeper plate 8 in sweeper group 27 is more than a slice, 3 to 6 is best, every sheet is welded to form by certain angle, the number of sweeper group 27 and interval corresponding with the clearance space of grating 20, sweeper group 27 is key, jackscrew, bearing pin with the connection of main shaft 6 or welds.Sweeper plate 8 is spline-like formations, multiple sweeper plate 8 is installed on the axle sleeve 28 on main shaft 6, be assembled into sweeper 27, the gap of sweeper plate 8 and quantity corresponding by the gap of grating 20 on sieve nest 26, the length of sweeper plate 8 determines according to the length of sieve nest 26, and the Design of length of sweeper plate 8 is between 500mm to 1200mm.
Supplying Sieving Mechanism of the present invention, by casing 4, main shaft reductor 5, main shaft 6, bearing block 7, sweeper plate 8, extension spring upper pendant 9, extension spring 10, sieve nest front beam 11, road wheel 12, walking mechanism reductor 13, rail 14, walking mechanism bearing block 15, supporting leg 16, rail pressing plate 17, gear 18, tooth bar 19, grating 20, sieve nest rear cross beam 21, sieve nest rear cross beam axle 22, sieve nest needle beam 24, earth plate 25, sieve nest 26, sweeper group 27, sweeper axle sleeve 28, walking mechanism main shaft 29, main shaft reductor moment arm 30, part such as driving speed reducer moment arm 31 grade forms.Casing 4 is supporter and the seal of whole equipment, is made by general steel plate.Sieve nest 26 is made up of the grating 20 of many high-abrasive materials after shaping by diagram bending 13 °-30 °, becomes sieve nest 26 after horizontal equidistant arrangement by sieve nest front beam 11, sieve nest rear cross beam 21 and sieve nest needle beam 24 lateral connection.Near one end of rubber conveyer cylinder 1, be arranged on casing 4 by sieve nest rear cross beam axle 22 through the hole on casing 4, rear cross beam axle 22 is without the need to fixing, and the steel plate by casing 4 supports, and just outside the boxboard that rear cross beam axle 22 stretches out casing 4, carries out pin or other modes position.Sieve nest 26 is arranged on the middle below of casing 4, the front end of sieve nest 26, and namely oversize (foreign material) 3 port of export, hangs on sieve nest front beam 11 by extension spring 10 lower end, and extension spring 10 upper end hangs in the extension spring upper pendant 9 that is welded on inside casing 4 boxboard.
Known by Fig. 3, Fig. 4, main shaft 6 is provided with many group sweeper groups 27, sweeper group 27 is welded on axle sleeve 28 by multi-disc sweeper plate 8, composition sweeper group 27.The multi-disc that sweeper plate 8 in sweeper group 27 can be more than a slice is welded to form by certain angle, is generally designed to 3 to 6 and is advisable.Sweeper group 27 can be key, jackscrew, bearing pin with the connection of main shaft 6 or welds.They are how many and interval is corresponding with the clearance space of grating 20 for sweeper group 27.Sweeper plate 8 is spline-like formations, is manufactured by high-abrasive material, and it not only cleans the foreign material above sieve nest 26, can also clean horizontal segment and be mixed in foreign material between grating 20, and therefore, the length of grating is greater than the distance between the compass screen surface of main shaft 6 and sieve nest 26.
Many grating one determining deviations and the grating 20 that parallel high-abrasive material is made forms sieve nest 26, gap and the quantity of grating 20 are decided by screen size, for impurity removing occasion, be generally selected in 100mm to 200mm, also can require higher or lower than these data according to reality screening.Material can select different brackets according to wear-resisting requirement, such as 40GrMo steel plate or round steel can be selected in general application scenario, specification is according to the size of compass screen surface and need the size of partition size to select, and steel plate usual thickness is between 6 to 30mm, and round steel diameter is often selected between 20mm to 70mm.Sieve nest 26 manufactures shaping laggard row heat treatment, and hardness, also can according to wear-resisting and shock-resistant requirement higher or lower than these data at HRC35-45.The installation of sieve nest 26 can be level, also can be to tilt.
Described main shaft 6 forms by organizing sweeper group 27 and bearing block 7 and reductor 5 more, and reductor 5 is arranged on the end of main shaft 6, and main shaft 6 is supported by bearing block 7 and is arranged on casing 4.Multiple sweeper plate 7 is assembled in composition sieve axle assembly on main shaft 6, the gap of sweeper plate 8 and quantity are decided by the spacing of grating 19, material can select different brackets according to wear-resisting requirement, such as 40GrMo steel plate or round steel can be selected in general application scenario, specification is according to the size of compass screen surface and need the size of partition size to select, and steel plate usual thickness is between 7 to 20mm.Manufacture shaping laggard row heat treatment, hardness, also can according to wear-resisting and shock-resistant requirement higher or lower than these data at HRC35-45.The length of sweeper plate 8 determines according to the length of sieve nest 9, is often selected between 500mm to 1200mm.Main shaft 6 requires will have wearability and impact resistance under the prerequisite meeting torque requiremnt, and 40GrMo or No. 45 carbon junction steel round steel can be selected in general application scenario, and carry out modifier treatment, hardness is at about HRC35.For making reductor exert oneself evenly, sweeper plate 8 is contained on main shaft 6 by certain angle interval group, and aligning method is shown in Fig. 3 and Fig. 4.Angle can arbitrarily arrange, as long as be evenly distributed on whole main shaft 6.Main shaft reductor 5 is containing motor, and output is connected with main shaft 6, fixes and is fixed on the boxboard of casing 4 by main shaft reductor moment arm 30, also can fix by forms such as bases.Be connected the rotation realizing sieving axle by motor-operated reductor 5 with main shaft 6, complete separation task, main shaft reductor 5 requires enough torsion.
During use, material 2, on the adhesive tape of rubber conveyer cylinder 1, falls into by many root distances from a determining deviation and on the sieve nest 26 that forms of parallel grating 20.Containing certain foreign material 3 in material 2, under the impact of material inertia, what material 2 was less than grating 20 gap crosses grating 20, falls into sieve nest 26 times, is greater than the material in grating 20 gap, be referred to as oversize (foreign material) 3, be delayed on sieve nest 9.Driven the sweeper plate 8 on main shaft 6 by motor-operated main shaft reductor 5, under constantly rotating, take out of outside sieve, complete removal of impurities task.
Accident cancel system is made up of walking mechanism main shaft 29, walking mechanism reductor 13, walking mechanism bearing block 15, road wheel 12, gear 18, tooth bar 19 and rail 14, rail pressing plate 17, driving speed reducer moment arm 31 etc.Walking mechanism main shaft 29 is fixed on supporting leg 16 by walking mechanism bearing block 15, walking mechanism main shaft 29 two ends are provided with gear 18, tooth bar 19 is arranged on the lower end of casing, relatively with gear 18 to engage, 29 1 installations of walking mechanism main shaft have lock-bit function walking mechanism reductor 13, walking mechanism reductor 13 is fixed on supporting leg 16 by driving speed reducer moment arm 31 or other modes, and road wheel 12 is arranged on the bottom of casing 4, contacts with rail 15.Rail 15 is arranged on supporting leg 16, is connected by rail pressing plate 17.Its course of work is: when artificially or automatically controlling, when needing equipment move into or shift out, walking mechanism reductor 13 carries out main story or anti-brick, drive walking mechanism main shaft 29 main story or anti-brick, gear 18 is main story or anti-brick simultaneously, drives tooth bar 19 to seesaw, should be tooth bar 19 and be arranged on casing 4, casing 4 drives road wheel to seesaw at rail 14, and the equipment that realizes runs and drops into or remove object.The non-detailed description of the present invention is known technology.
Claims (7)
1. coal conveying system list roller grate formula high efficiency screening device, it is characterized in that: screening plant is by casing (4), sieve nest (26), sweeper group (27) and road wheel (12), walking mechanism main shaft (29) forms, casing (4) bottom installed rows travelling wheel (12), casing (4) and rubber conveyer cylinder (1) opposite site are charging aperture, casing (4) bottom communicates with hopper (23) is suitable for reading, road wheel (12) and rail (14) touch, rail (14) is arranged on supporting leg (16) and is connected by rail pressing plate (17), walking mechanism bearing block (15) is fixed in supporting leg (16) outside of rail (14) respectively, walking mechanism reductor (13) is arranged on walking mechanism main shaft (29), driving speed reducer moment arm (31) is in the upper location of supporting leg (16), supporting leg (16) other end fixes on the ground, walking mechanism main shaft (29) is provided with gear (18), tooth bar (19) be arranged on casing (4) lower end, relatively with gear (18) to engage, walking mechanism reductor (13) has lock-bit function, described casing (4) bottom two side box plate is provided with hole, and sieve nest rear cross beam axle (22) is through the hole on casing (4), and the boxboard outer end that rear cross beam axle (22) stretches out casing (4) adopts pin to position, sieve nest front beam (11) synthesizes sieve nest (26) with sieve nest rear cross beam (22) and sieve nest needle beam (24) by several grating (20) Connecting groups, the two ends of sieve nest front beam (11) mount with two extension spring (10) lower ends respectively, and two extension spring (10) upper ends mount with the extension spring upper pendant (9) be welded on inside casing (4) boxboard respectively, described casing (4) outside installation shaft bearing, middle part (7), main shaft reductor (5) connects with main shaft (6), casing (4) the interior part of main shaft (6), axle sleeve (28) is installed, the upper welding many groups sweeper group (27) of axle sleeve (28), sweeper group (27) is welded on axle sleeve (28) by multi-disc sweeper plate (8) and forms.
2. coal conveying system list roller grate formula high efficiency screening device according to claim 1, is characterized in that: the shape of grating (20) is become 13 °-30 ° skewed near the part of rubber conveyer cylinder (1); The other end is horizontal.
3. coal conveying system list roller grate formula high efficiency screening device according to claim 1, it is characterized in that: the sweeper plate (8) in sweeper group (27) is for more than a slice, 3 to 6 is best, every sheet presses certain angle uniform welding composition, the number of sweeper group (27) and interval corresponding with the clearance space of grating (20), sweeper group 27 is key, jackscrew, bearing pin with the connected mode of main shaft (6) or welds.
4. coal conveying system list roller grate formula high efficiency screening device according to claim 1, is characterized in that: sweeper plate (8) is spline-like formations.
5. coal conveying system list roller grate formula high efficiency screening device according to claim 1, it is characterized in that: the axle sleeve (28) of multiple sweeper plate (8) installation main shaft (6) is assembled into sweeper (27), the gap that the gap of sweeper plate (8) and quantity go up grating (20) by sieve nest (26) is corresponding, the length of sweeper plate (8) determines according to the length of sieve nest (26), and the Design of length of sweeper plate (8) is between 500mm to 1200mm.
6. coal conveying system list roller grate formula high efficiency screening device according to claim 1, it is characterized in that: sieve nest (26) is arranged on the middle below of casing (4), the front end of sieve nest (26) and oversize (foreign material) (3) port of export, hang on sieve nest front beam (11) by extension spring (10) lower end, extension spring (10) upper end hangs in the extension spring upper pendant (9) that is welded on inside casing (4) boxboard.
7. coal conveying system list roller grate formula high efficiency screening device according to claim 1, is characterized in that: the length of grating (20) is greater than the distance between the compass screen surface of main shaft (6) and sieve nest (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022650.0A CN104492681A (en) | 2015-01-18 | 2015-01-18 | Single-roller grate type effective screening device of coal conveying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022650.0A CN104492681A (en) | 2015-01-18 | 2015-01-18 | Single-roller grate type effective screening device of coal conveying system |
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| Publication Number | Publication Date |
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| CN104492681A true CN104492681A (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510022650.0A Pending CN104492681A (en) | 2015-01-18 | 2015-01-18 | Single-roller grate type effective screening device of coal conveying system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL10791C (en) * | ||||
| FR2495026A1 (en) * | 1979-06-11 | 1982-06-04 | Ando Screen Seisakusho Kk | BRUSH DRIVE DEVICE FOR SOLID-LIQUID SEPARATION SIEVE |
| JPS6027511Y2 (en) * | 1980-08-23 | 1985-08-19 | 旭可鍛鉄株式会社 | rotary sieve device |
| CN102806195A (en) * | 2012-08-16 | 2012-12-05 | 高远新 | Rotary composite grate impurity removing material separating device |
| CN103567049A (en) * | 2013-11-25 | 2014-02-12 | 黑龙江宏宇电站设备有限公司 | Ball mill for dry powder grinding mill |
| CN204486186U (en) * | 2015-01-18 | 2015-07-22 | 济南宏一伟电力设备有限公司 | Coal conveying system list roller grate formula high efficiency screening device |
-
2015
- 2015-01-18 CN CN201510022650.0A patent/CN104492681A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL10791C (en) * | ||||
| FR2495026A1 (en) * | 1979-06-11 | 1982-06-04 | Ando Screen Seisakusho Kk | BRUSH DRIVE DEVICE FOR SOLID-LIQUID SEPARATION SIEVE |
| JPS6027511Y2 (en) * | 1980-08-23 | 1985-08-19 | 旭可鍛鉄株式会社 | rotary sieve device |
| CN102806195A (en) * | 2012-08-16 | 2012-12-05 | 高远新 | Rotary composite grate impurity removing material separating device |
| CN103567049A (en) * | 2013-11-25 | 2014-02-12 | 黑龙江宏宇电站设备有限公司 | Ball mill for dry powder grinding mill |
| CN204486186U (en) * | 2015-01-18 | 2015-07-22 | 济南宏一伟电力设备有限公司 | Coal conveying system list roller grate formula high efficiency screening device |
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