CN109794313A - A kind of screening plant with anti-blockage function of good crushing effect - Google Patents
A kind of screening plant with anti-blockage function of good crushing effect Download PDFInfo
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- CN109794313A CN109794313A CN201910242095.0A CN201910242095A CN109794313A CN 109794313 A CN109794313 A CN 109794313A CN 201910242095 A CN201910242095 A CN 201910242095A CN 109794313 A CN109794313 A CN 109794313A
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Abstract
The present invention relates to a kind of screening plants with anti-blockage function of good crushing effect, including main body and four brackets, disintegrating mechanism and two dredging mechanisms are equipped in the main body, the disintegrating mechanism includes closed component and two shredder assemblies, the shredder assemblies include first motor, wire spool, movable plate, pulverizing unit and two driving units, the dredging mechanism includes third motor, half gear, movable frame, vibration rod and two rack gears, the screening plant with anti-blockage function of the good crushing effect passes through disintegrating mechanism, crushed work can be carried out to material, avoid large-scale feed blocking on strainer, influence screening effect, pass through dredging mechanism, dredging work can be carried out to strainer, avoid filter net jam, influence screening effect.
Description
Technical field
The present invention relates to preparation equipment field, in particular to the screening with anti-blockage function of a kind of good crushing effect is set
It is standby.
Background technique
Screening machine is the relative motion using bulk granular material and compass screen surface, makes partial particulate through sieve pore, by sand, gravel, broken
The materials such as stone are divided into the vibration screening machinery equipment of different stage by granular size.Screening machine screening process is usually continuous,
After screening raw material is given on sieving machine (abbreviation sieve), the material less than screen size penetrates sieve pore, referred to as undersized product；
Material greater than screen size is constantly discharged from compass screen surface, referred to as sieves upper product.
Before existing screening plant carries out screening work to mineral, need to carry out mineral broken work, due to mineral original
Expect that most quality is hard, crushing effect is poor, influences screening effect, and moreover, existing screening plant is when running one section
Between after, strainer be easy is blocked by raw mineral materials, influence screening effect, reduce the practicability of screening plant.
Summary of the invention
The technical problem to be solved by the present invention is for overcome the deficiencies in the prior art, a kind of good crushing effect is provided
Screening plant with anti-blockage function.
The technical solution adopted by the present invention to solve the technical problems is: a kind of good crushing effect has anti-blockage function
Screening plant, including main body and four brackets, four brackets are separately fixed at the four corners of the lower section of main body, the main body
Above and below be respectively equipped with inlet port and outlet port, the inlet port and outlet port are connected to main body, are set in the main body
There are strainer and PLC, the strainer is fixed on the inner wall of main body, disintegrating mechanism and two dredging mechanisms are equipped in the main body,
The top of strainer is arranged in the disintegrating mechanism, and two dredging mechanisms are separately positioned on the two sides of the lower section of strainer；
The disintegrating mechanism includes closed component and two shredder assemblies, and the top of strainer is arranged in the closed component,
Two shredder assemblies are separately positioned on the two sides of the top of closed component；
The shredder assemblies include first motor, wire spool, movable plate, pulverizing unit and two driving units, and described
One motor is fixed on the inner wall of the side of main body, and the first motor and wire spool are sequentially connected, two driving unit difference
It is arranged in above and below first motor, the connection of the side of the driving unit and movable plate, the pulverizing unit includes the
Two motors and crushing plate, second motor are fixed on the other side of movable plate, second motor and crushing plate transmission connection,
The side of the close feed inlet for crushing plate is equipped with several sawtooth, and the sawtooth is uniformly fixed on the close feed inlet for crushing plate
Side, second motor is electrically connected with PLC；
The dredging mechanism includes third motor, half gear, movable frame, vibration rod and two rack gears, the third motor
It is fixedly connected with the inner wall of the side of main body, the third motor is connect with half gear drive, and half gear is arranged at two
Between rack gear, the half wheel and rack engagement, two rack gears are fixedly connected with the two sides in movable frame respectively, the vibration rod
It is fixedly connected with above movable frame, the third motor is electrically connected with PLC.
Preferably, the driving unit includes bracing wire, sliding block, adjusting rod and spring, institute in order to drive movable plate mobile
The one end for stating bracing wire is arranged on wire spool, and the other end of the bracing wire is fixedly connected with a slide block, and the spring is arranged in sliding block
Separate first motor side, the spring connect with sliding block, and the spring is in tensional state, the both ends of the adjusting rod
It is hinged with the side of separate second motor of movable plate and sliding block respectively.
Preferably, in order to extend the service life of bracing wire, the making material of the bracing wire is nylon.
Preferably, the shredder assemblies further include guide rod in order to limit the moving direction of sliding block, the guide rod is perpendicular
To main intracorporal top is fixed on, the sliding block is set on guide rod, and the sliding block is slidably connected with guide rod, two springs
One end of separate sliding block connect respectively with the both ends of guide rod.
Preferably, in order to limit the moving direction for crushing plate, the shredder assemblies further include circular orbit and two shiftings
Lever, the circular orbit are fixed on the side close to the second motor of movable plate, and the circular orbit is equipped with annular groove, institute
It states circular orbit and crushes plate coaxial arrangement, side of the one end of two mobile bars respectively with the separate feed inlet for crushing plate is fixed
Connection, in a ring groove, the other end of the mobile bar is matched with annular groove, the movement for the other end setting of the mobile bar
Bar is slidably connected with circular orbit.
Preferably, the closed component includes two closed cells, and two closed cells are set respectively in order to control blanking
It sets on the inner wall of the two sides of main body, the closed cell includes baffle, support shaft and cylinder, one end of the baffle and main body
Side inner wall it is hinged, the other end of two baffles abuts each other, the cylinder and support shaft are arranged at baffle and strainer
Between, one end of the support shaft is fixed on the inner wall of the side of main body, the cylinder body of the cylinder and the other end of support shaft
Hingedly, the gas bar of the cylinder and the lower section of baffle are hinged, and the cylinder is electrically connected with PLC.
Preferably, being coated with lubricating oil on half gear in order to enable movable frame is mobile smooth.
Preferably, in order to limit the moving direction of movable frame, the dredging mechanism further includes two limit assemblies, two
Limit assembly is separately positioned on the two sides of movable frame, and the limit assembly includes gag lever post and two limited blocks, the gag lever post
It is vertically fixed on main intracorporal bottom, two limited blocks are fixedly connected with the both ends of the side of movable frame respectively, the limited block
It is set on gag lever post, the limited block is slidably connected with gag lever post.
Preferably, in order to avoid damaging strainer, one end of the separate movable frame of the vibration rod is equipped with rubber pad.
Preferably, the main body is equipped with display screen and several control buttons in order to improve the intelligence degree of equipment,
The display screen and control button are electrically connected with PLC.
The invention has the advantages that the screening plant with anti-blockage function of the good crushing effect passes through pulverizer
Structure can carry out crushed work to material, avoid large-scale feed blocking on strainer, influence screening effect, with existing crushing
Mechanism compares, which improves crushing effect, improves the practicability of equipment, can be to strainer by dredging mechanism
Dredging work is carried out, filter net jam is avoided, influences screening effect, compared with existing dredging mechanism, dredging mechanism dredging effect
Fruit is good, improves the reliability of equipment.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of the screening plant with anti-blockage function of good crushing effect of the invention；
Fig. 2 is the cross-sectional view of the main body of the screening plant with anti-blockage function of good crushing effect of the invention；
Fig. 3 is the structural representation of the disintegrating mechanism of the screening plant with anti-blockage function of good crushing effect of the invention
Figure；
Fig. 4 is the structural representation of the dredging mechanism of the screening plant with anti-blockage function of good crushing effect of the invention
Figure；
In figure: 1. main bodys, 2. brackets, 3. feed inlets, 4. discharge ports, 5. strainers, 6. support shafts, 7. cylinders, 8. baffles, 9.
First motor, 10. wire spools, 11. bracing wires, 12. sliding blocks, 13. springs, 14. adjusting rods, 15. movable plates, 16. second motors,
17. crushing plate, 18. guide rods, 19. circular orbits, 20. mobile bars, 21. third motors, 22. half gears, 23. rack gears, 24. are moved
Dynamic frame, 25. vibration rods, 26. rubber pads, 27. limited blocks, 28. gag lever posts, 29. display screens, 30. control buttons.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figs. 1-2, the screening plant with anti-blockage function of a kind of good crushing effect, including main body 1 and four
Bracket 2, four brackets 2 are separately fixed at the four corners of the lower section of main body 1, be respectively equipped with above and below the main body 1 into
Material mouth 3 and discharge port 4, the feed inlet 3 and discharge port 4 are connected to main body 1, are equipped with strainer 5 and PLC, institute in the main body 1
It states strainer 5 to be fixed on the inner wall of main body 1, is equipped with disintegrating mechanism and two dredging mechanisms, the disintegrating mechanism in the main body 1
The top of strainer 5 is set, and two dredging mechanisms are separately positioned on the two sides of the lower section of strainer 5；
The screening plant with anti-blockage function of the good crushing effect can crush material by disintegrating mechanism
Work, avoids large-scale feed blocking on strainer 5, influences screening effect, by dredging mechanism, can dredge to strainer 5
Work avoids strainer 5 from blocking, influences screening effect.
As shown in figure 3, the disintegrating mechanism includes closed component and two shredder assemblies, the closed component setting is being filtered
The top of net 5, two shredder assemblies are separately positioned on the two sides of the top of closed component；
The shredder assemblies include first motor 9, wire spool 10, movable plate 15, pulverizing unit and two driving units, institute
On the inner wall for stating the side that first motor 9 is fixed on main body 1, the first motor 9 is sequentially connected with wire spool 10, two drivings
Unit is separately positioned on above and below first motor 9, and the driving unit is connect with the side of movable plate 15, the crushing
Unit includes the second motor 16 and crushes plate 17, and second motor 16 is fixed on the other side of movable plate 15, second electricity
Machine 16 and crushing plate 17 are sequentially connected, and the side of the close feed inlet 3 for crushing plate 17 is equipped with several sawtooth, and the sawtooth is equal
Even to be fixed on the side for crushing the close feed inlet 3 of plate 17, second motor 16 is electrically connected with PLC；
When user by material from feed inlet 3 from baffle 8 in investment subject 1 when, first motor 9 starts, wire spool
10 rotations, so that two driving unit work, drive movable plate 15 mobile to the direction far from first motor 9, to pass through powder
Broken unit carries out extruding crushed work to material, meanwhile, the starting of the second motor 16 drives and crushes the rotation of plate 17, so that crushing plate
17 carry out rotating shredder to material while carrying out extruding crushed work to material, improve crushing effect, avoid the need for more
Secondary grinding, simplifies beneficiation flowsheet.
As shown in figure 4, the dredging mechanism includes third motor 21, half gear 22, movable frame 24, vibration rod 25 and two
Rack gear 23, the third motor 21 are fixedly connected with the inner wall of the side of main body 1, and the third motor 21 and half gear 22 are driven
Connection, half gear 22 are arranged between two rack gears 23, and half gear 22 is engaged with rack gear 23, and two rack gears 23 are distinguished
It is fixedly connected with the two sides in movable frame 24, the vibration rod 25 is fixedly connected with the top of movable frame 24, the third motor
21 are electrically connected with PLC.
When carrying out dredging work, third motor 21 starts, and the rotation of half gear 22, band carry-over bar 23 is mobile, to drive
Movable frame 24 moves back and forth up and down, so that vibration rod 25 moves back and forth, so that vibration rod 25 constantly strikes strainer 5
Work is hit, realizes the function of dredging, feed blocking strainer 5 is avoided, influences screening effect.
Preferably, the driving unit includes bracing wire 11, sliding block 12, adjusting rod 14 in order to drive movable plate 15 mobile
It is arranged on wire spool 10 with one end of spring 13, the bracing wire 11, the other end of the bracing wire 11 is fixedly connected with sliding block 12,
The side of the separate first motor 9 of sliding block 12 is arranged in the spring 13, and the spring 13 is connect with sliding block 12, the spring 13
In tensional state, the both ends of the adjusting rod 14 are cut with scissors with the side of separate second motor 16 of movable plate 15 and sliding block 12 respectively
It connects.
First motor 9 starts, and wire spool 10 rotates, and tightens bracing wire 11, drives two sliding blocks 12 to close to first motor 9
Direction is mobile, so that it is mobile to the direction far from first motor 9 to drive movable plate 15 by adjusting rod 14, to drive two powder
Broken unit is close to each other, carries out crushed work to material so that crushing plate 17, large-scale material is avoided to influence screening effect.
Preferably, in order to extend the service life of bracing wire 11, the making material of the bracing wire 11 is nylon.
Preferably, in order to limit the moving direction of sliding block 12, the shredder assemblies further include guide rod 18, the guiding
Bar 18 is vertically fixed on the top in main body 1, and the sliding block 12 is set on guide rod 18, and the sliding block 12 and guide rod 18 are sliding
Dynamic connection, one end of the separate sliding block 12 of two springs 13 is connect with the both ends of guide rod 18 respectively.
By the way that guide rod 18 is arranged, the moving direction of sliding block 12 is limited, so that sliding block 12 is more stable when mobile.
Preferably, the shredder assemblies further include circular orbit 19 and two in order to limit the moving direction for crushing plate 17
A mobile bar 20, the circular orbit 19 are fixed on the side close to the second motor 16 of movable plate 15, the circular orbit 19
Be equipped with annular groove, the circular orbit 19 is coaxially disposed with plate 17 is crushed, one end of two mobile bars 20 respectively with crush plate
The side of 17 separate feed inlet 3 is fixedly connected, and the other end of the mobile bar 20 is arranged in a ring groove, the mobile bar 20
The other end matched with annular groove, the mobile bar 20 is slidably connected with circular orbit 19.
When crushing the rotation of plate 17, drives mobile bar 20 mobile in circular orbit 19, limits the moving direction for crushing plate 17,
Improve stability when crushing the movement of plate 17.
Preferably, the closed component includes two closed cells, and two closed cells are set respectively in order to control blanking
It sets on the inner wall of the two sides of main body 1, the closed cell includes baffle 8, support shaft 6 and cylinder 7, one end of the baffle 8
Hinged with the inner wall of the side of main body 1, the other end of two baffles 8 abuts each other, the cylinder 7 and support shaft 6 are arranged at
Between baffle 8 and strainer 5, on the inner wall for the side that one end of the support shaft 6 is fixed on main body 1, the cylinder body of the cylinder 7 with
The other end of support shaft 6 is hinged, and the gas bar of the cylinder 7 and the lower section of baffle 8 are hinged, and the cylinder 7 is electrically connected with PLC.
When user by raw mineral materials from investment subject 1, so that material drops down on baffle 8, passing through powder from feed inlet 3
Broken mechanism carries out crushed work to material, after the completion of crushed work, controls cylinder 7 by PLC and starts, drive the gas of cylinder 7
Bar is mobile, so that baffle 8 rotates, so that the material on baffle 8 is slipped on strainer 5, carries out screening work.
Preferably, being coated with lubricating oil on half gear 22, reducing half tooth in order to enable movable frame 24 is mobile smooth
Frictional force between wheel 22 and rack gear 23, so that rack gear 23 is more smooth when mobile, thus when improving the movement of movable frame 24
Stability.
Preferably, in order to limit the moving direction of movable frame 24, the dredging mechanism further includes two limit assemblies, two
A limit assembly is separately positioned on the two sides of movable frame 24, and the limit assembly includes gag lever post 28 and two limited blocks 27, institute
The bottom that gag lever post 28 is vertically fixed in main body 1 is stated, two both ends of the limited block 27 respectively with the side of movable frame 24 are fixed
Connection, the limited block 27 are set on gag lever post 28, and the limited block 27 is slidably connected with gag lever post 28.
When movable frame 24 is mobile, drives limited block 27 to move on gag lever post 28, limits the moving direction of movable frame 24,
Improve the stability when movement of movable frame 24.
Preferably, in order to avoid damaging strainer 5, one end of the separate movable frame 24 of the vibration rod 25 is equipped with rubber pad
26。
Preferably, the main body 1 is equipped with display screen 29 and several controls are pressed in order to improve the intelligence degree of equipment
Key 30, the display screen 29 and control button 30 are electrically connected with PLC.
By the way that display screen 29 is arranged, shows the working condition of equipment, by the way that control button 30 is arranged, can control equipment work
Make, improves the intelligence degree of equipment.
When user by material from feed inlet 3 from baffle 8 in investment subject 1 when, first motor 9 starts, wire spool
10 rotations, tighten bracing wire 11, and the direction for driving two sliding blocks 12 to close first motor 9 is mobile, to pass through 14 band of adjusting rod
Dynamic movable plate 15 is mobile to the direction far from first motor 9, to drive two pulverizing units close to each other, so that crushing
Plate 17 carries out extruding crushed work to material, meanwhile, the starting of the second motor 16 drives and crushes the rotation of plate 17, so that crushing plate 17
Rotating shredder is carried out to material while carrying out extruding crushed work to material, improves crushing effect, is avoided the need for repeatedly
Grinding, simplifies beneficiation flowsheet.When carrying out dredging work, third motor 21 starts, and half gear 22 rotation, band carry-over bar 23 moves
It is dynamic, to drive movable frame 24 to move back and forth up and down, so that vibration rod 25 moves back and forth, so that vibration rod 25 is continuous right
Strainer 5 carries out percussion work, realizes the function of dredging, avoids feed blocking strainer 5, influences screening effect.
Compared with prior art, the screening plant with anti-blockage function of the good crushing effect, can by disintegrating mechanism
To carry out crushed work to material, avoids large-scale feed blocking on strainer 5, influence screening effect, with existing disintegrating mechanism
It compares, which improves crushing effect, improves the practicability of equipment, by dredging mechanism, can carry out to strainer 5
Work is dredged, avoids strainer 5 from blocking, influences screening effect, compared with existing dredging mechanism, which dredges effect
It is good, improve the reliability of equipment.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of screening plant with anti-blockage function of good crushing effect, including main body (1) and four brackets (2), four
Bracket (2) is separately fixed at the four corners of the lower section of main body (1), is respectively equipped with feed inlet above and below the main body (1)
(3) it is connected to main body (1) with discharge port (4), the feed inlet (3) and discharge port (4), strainer is equipped in the main body (1)
(5) it is fixed on the inner wall of main body (1) with PLC, the strainer (5), which is characterized in that pulverizer is equipped in the main body (1)
Structure and two dredging mechanisms, the disintegrating mechanism are arranged in the top of strainer (5), and two dredging mechanisms are separately positioned on strainer
(5) two sides of lower section；
The disintegrating mechanism includes closed component and two shredder assemblies, and the closed component setting is in the top of strainer (5), and two
A shredder assemblies are separately positioned on the two sides of the top of closed component；
The shredder assemblies include first motor (9), wire spool (10), movable plate (15), pulverizing unit and two driving units,
On the inner wall for the side that the first motor (9) is fixed on main body (1), the first motor (9) and wire spool (10) transmission connect
It connecing, two driving units are separately positioned on above and below first motor (9), and the one of the driving unit and movable plate (15)
Side connection, the pulverizing unit include the second motor (16) and crush plate (17), and second motor (16) is fixed on movable plate
(15) the other side, second motor (16) and crushing plate (17) transmission connection, the close feed inlet for crushing plate (17)
(3) side is equipped with several sawtooth, and the sawtooth is uniformly fixed on the side for crushing the close feed inlet (3) of plate (17), described
Second motor (16) is electrically connected with PLC；
The dredging mechanism includes third motor (21), half gear (22), movable frame (24), vibration rod (25) and two rack gears
(23), the third motor (21) is fixedly connected with the inner wall of the side of main body (1), the third motor (21) and half gear
(22) it is sequentially connected, half gear (22) is arranged between two rack gears (23), and half gear (22) is nibbled with rack gear (23)
It closes, two rack gears (23) are fixedly connected with the two sides in movable frame (24) respectively, the vibration rod (25) and movable frame (24)
Top is fixedly connected, and the third motor (21) is electrically connected with PLC.
2. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that the drive
Moving cell includes bracing wire (11), sliding block (12), adjusting rod (14) and spring (13), and one end of the bracing wire (11) is arranged in coiling
On disk (10), the other end of the bracing wire (11) is fixedly connected with sliding block (12), and the spring (13) is arranged in sliding block (12)
Side far from first motor (9), the spring (13) connect with sliding block (12), and the spring (13) is in tensional state, institute
The both ends for stating adjusting rod (14) are hinged with the side of separate second motor (16) of movable plate (15) and sliding block (12) respectively.
3. the screening plant with anti-blockage function of good crushing effect as claimed in claim 2, which is characterized in that the drawing
The making material of line (11) is nylon.
4. the screening plant with anti-blockage function of good crushing effect as claimed in claim 3, which is characterized in that the powder
Broken component further includes guide rod (18), and the guide rod (18) is vertically fixed on the top in main body (1), sliding block (12) set
It is located on guide rod (18), the sliding block (12) is slidably connected with guide rod (18), the separate sliding block (12) of two springs (13)
One end connect respectively with the both ends of guide rod (18).
5. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that the powder
Broken component further includes circular orbit (19) and two mobile bars (20), and the circular orbit (19) is fixed on leaning on for movable plate (15)
The side of nearly second motor (16), the circular orbit (19) are equipped with annular groove, the circular orbit (19) and crushing plate
(17) it is coaxially disposed, one end of two mobile bars (20) is fixed with the side for the separate feed inlet (3) for crushing plate (17) respectively to be connected
It connects, in a ring groove, the other end of the mobile bar (20) is matched with annular groove, institute for the other end setting of the mobile bar (20)
Mobile bar (20) is stated to be slidably connected with circular orbit (19).
6. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that the envelope
Closing component includes two closed cells, and two closed cells are separately positioned on the inner wall of the two sides of main body (1), and the closing is single
Member includes baffle (8), support shaft (6) and cylinder (7), and the inner wall of one end and the side of main body (1) of the baffle (8) is hinged,
The other end of two baffles (8) abuts each other, the cylinder (7) and support shaft (6) be arranged at baffle (8) and strainer (5) it
Between, on the inner wall for the side that one end of the support shaft (6) is fixed on main body (1), the cylinder body and support shaft of the cylinder (7)
(6) the other end is hinged, and the gas bar of the cylinder (7) and the lower section of baffle (8) are hinged, and the cylinder (7) is electrically connected with PLC.
7. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that described half
Gear is coated with lubricating oil on (22).
8. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that described to dredge
Logical mechanism further includes two limit assemblies, and two limit assemblies are separately positioned on the two sides of movable frame (24), the limit assembly
Including gag lever post (28) and two limited blocks (27), the gag lever post (28) is vertically fixed on the bottom in main body (1), two limits
Position block (27) is fixedly connected with the both ends of the side of movable frame (24) respectively, and the limited block (27) is set in gag lever post (28)
On, the limited block (27) is slidably connected with gag lever post (28).
9. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that the shake
One end of the separate movable frame (24) of lever (25) is equipped with rubber pad (26).
10. the screening plant with anti-blockage function of good crushing effect as described in claim 1, which is characterized in that described
Main body (1) is equipped with display screen (29) and several control buttons (30), and the display screen (29) and control button (30) are and PLC
Electrical connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910242095.0A CN109794313A (en) | 2019-03-28 | 2019-03-28 | A kind of screening plant with anti-blockage function of good crushing effect |
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Cited By (3)
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| CN110980323A (en) * | 2019-11-21 | 2020-04-10 | 李志聪 | Electro-hydraulic distributor with polishing function for coal |
| CN111482226A (en) * | 2020-04-12 | 2020-08-04 | 廖响中 | Pulverizer for producing remediation agent for heavy metals in soil and manufacturing method |
| CN112246353A (en) * | 2020-09-27 | 2021-01-22 | 陈维元 | A mix grinder for pitch material production |
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