CN113368988B - Shearing and stirring device in polytetrafluoroethylene powder production process - Google Patents

Shearing and stirring device in polytetrafluoroethylene powder production process Download PDF

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Publication number
CN113368988B
CN113368988B CN202110572130.2A CN202110572130A CN113368988B CN 113368988 B CN113368988 B CN 113368988B CN 202110572130 A CN202110572130 A CN 202110572130A CN 113368988 B CN113368988 B CN 113368988B
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Prior art keywords
stirring
stator
polytetrafluoroethylene powder
rotor
set forth
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CN113368988A (en
Inventor
张志超
朱好言
邢立军
闫志强
丛军
张春青
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Liaocheng Fuer New Material Science & Technology Co ltd
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Liaocheng Fuer New Material Science & Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/0018—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The invention relates to a shearing and stirring device in the production process of polytetrafluoroethylene powder, which comprises an upper stirring stator and a ring-shaped structure from top to bottom, wherein upper fixed teeth are arranged on the inner side of a ring along the circumferential direction; an upper stirring rotor having a paddle rotating structure; a middle stirring stator with a ring-shaped structure; the lower stirring rotor is provided with an open impeller-shaped structure and comprises a rotary disc and blades arranged on the rotary disc; the central rotating shaft passes through the inner sides of the upper stirring stator and the middle stirring stator, and the upper stirring rotor and the turntable are connected with the central rotating shaft; a gap is arranged between the upper stirring stator and the upper stirring rotor, and a gap is arranged between the middle stirring stator and the lower stirring rotor. The polytetrafluoroethylene powder can be pulverized from more than 400 microns to about 200 microns.

Description

Shearing and stirring device in polytetrafluoroethylene powder production process
Technical Field
The invention belongs to the technical field of chemical production powder crushing, and particularly relates to a special shearing and stirring device capable of crushing polytetrafluoroethylene particles to a particle size of below 200 micrometers.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In the production process of the polytetrafluoroethylene powder, the polymerized polytetrafluoroethylene large granular materials need to be crushed to be less than 200 microns, and acidic substances need to be washed and removed. At present, most enterprises adopt steps of firstly washing after polymerization, then removing water through a vibrating screen, roughly shearing and shearing, centrifuging through a centrifugal machine and the like, and then performing air flow crushing to obtain corresponding products. However, the method has the disadvantages of more investment equipment, very precise mass equipment, import requirement, high maintenance difficulty and complex flow. Some enterprises or adopt squirrel-cage stirrers to pound to pieces, and its principle is that the bold material is inhaled the agitator center through the kuppe, and the rethread squirrel-cage stator throws the material out, and the collision of material cauldron wall to with the bold material breakage. However, the method needs larger motor power and longer mashing time, which causes larger energy consumption, and the problem is more prominent along with the enlargement of the enterprise scale.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a shearing and stirring device in the production process of polytetrafluoroethylene powder.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a shearing and stirring device in the production process of polytetrafluoroethylene powder comprises a shear stirring device and a stirring device,
the upper stirring stator is of a circular ring structure, and upper fixed teeth are arranged on the inner side of the circular ring along the circumferential direction;
an upper stirring rotor having a paddle rotating structure;
a middle stirring stator with a ring-shaped structure;
the lower stirring rotor is provided with an open impeller-shaped structure and comprises a rotary disc and blades arranged on the rotary disc;
the central rotating shaft penetrates through the inner sides of the upper stirring stator and the middle stirring stator, and the upper stirring rotor and the turntable are connected with the central rotating shaft; a gap is arranged between the upper stirring stator and the upper stirring rotor, and a gap is arranged between the middle stirring stator and the lower stirring rotor.
The upper stirring stator and the middle stirring stator are immobile relative to the upper stirring rotor and the lower stirring rotor, and the upper stirring rotor and the lower stirring rotor are driven to rotate by a central rotating shaft; a gap is arranged between the upper stirring stator and the upper stirring rotor, and the gap is utilized for grinding materials; a gap is formed between the middle stirring stator and the lower stirring rotor, and the gap is utilized for grinding materials; the material is discharged from top to bottom, and is ground in the discharging process. The problem of grinding particles of micron size to smaller particles is solved.
One or more technical schemes of the invention have the following beneficial effects:
the shearing and stirring device can crush polytetrafluoroethylene powder to about 200 microns from more than 400 microns. The shearing and stirring device has good crushing effect and small consumed motor power, can realize that the particles are ground into smaller particles in the process of passing through from top to bottom through the mutual matching of the positions and the structures of the stirring stator and the stirring rotor, and has short grinding time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a sectional view of a shearing and stirring apparatus;
FIG. 2 is a side view structural view of an upper stirring stator;
FIG. 3 is a top view structural view of an upper stirring stator;
FIG. 4 is a side view structural view of an upper stirring rotor;
FIG. 5 is a top view structural view of an upper stirring rotor;
FIG. 6 is a side view of the stirring stator;
FIG. 7 is a top view of the stirring stator;
FIG. 8 is a side view structural view of a lower stirring rotor;
FIG. 9 is a top view structural view of a lower stirring rotor;
FIG. 10 is a side view structural view of a lower stirring stator;
FIG. 11 is a top view structural view of a lower stirring stator;
wherein, 1-a dome; 2-a baffle plate; 3-installing a stirring stator; 4-an upper stirring rotor; 5-a middle stirring stator; 6-lower stirring stator; 7-lower stirring rotor; 8-fixing teeth; 9-an outer annular fixture; 11-paddle leaves; 12-an inclined portion; 13-a blade; 14-a through hole; 15-rectangular holes; 16-gap; 17-angle of the inclined plane.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A shearing and stirring device in the production process of polytetrafluoroethylene powder comprises a shear stirring device and a stirring device,
the upper stirring stator is of a circular ring structure, and upper fixed teeth are arranged on the inner side of the circular ring along the circumferential direction;
an upper stirring rotor having a paddle rotating structure;
a middle stirring stator with a ring-shaped structure;
the lower stirring rotor is provided with an open impeller-shaped structure and comprises a rotary disc and blades arranged on the rotary disc;
the central rotating shaft passes through the inner sides of the upper stirring stator and the middle stirring stator, and the upper stirring rotor and the turntable are connected with the central rotating shaft; a gap is arranged between the upper stirring stator and the upper stirring rotor, and a gap is arranged between the middle stirring stator and the lower stirring rotor.
In some embodiments of the present invention, the gap between the upper stirring stator and the upper stirring rotor is an L-shaped gap, and the L-shaped gap includes a gap between the upper and lower structures and a gap between the left and right structures.
In some embodiments of the present invention, the number of the upper fixed teeth of the upper stirring stator is set to 6 to 10; preferably 8.
In some embodiments of the present invention, the upper surface of the upper fixing teeth has a downward inclined surface; the further inclination is 5-20 deg..
In some embodiments of the present invention, the plurality of upper fixing teeth are arranged to be inclined in a circumferential direction. I.e. the upper fixing teeth are inclined in the same direction and in the circumferential direction.
In some embodiments of the invention, the upper stirring stator comprises an outer annular fixed body contiguous to an outer end of the upper fixed teeth, having a downwardly extending configuration with respect to the upper fixed teeth.
In some embodiments of the present invention, the number of blades of the upper stirring rotor is 6 to 10; preferably 8.
In some embodiments of the present invention, the lower surfaces of the blades of the upper stirring rotor have slopes inclined upward; the further inclination is 5-20 deg..
In some embodiments of the present invention, the inner side wall of the middle stirring stator has a lower annular inclined portion, the inclined portion is directed from the inner side wall to the inner side of the center of the circle of the middle stirring stator, and the wall thickness of the lower portion is greater than that of the upper portion.
In some embodiments of the present invention, the bottom surface of the inclined portion has an upward inclined surface directed in the direction of the center of the circle; the angle of the further inclined surface is 3-6 deg..
In some embodiments of the invention, the blades of the lower stirring rotor are disposed at a position near the outer edge of the turntable; the number of further blades is 8-20.
In some embodiments of the invention, the top surface of the blade has a downward slope directed outward of the center of the circle.
In some embodiments of the invention, the rotating disk is provided with a plurality of through holes, and the through holes are positioned on the inner side of the blade.
In some embodiments of the present invention, the stirring device further comprises a lower stirring stator in a ring structure and located outside the lower stirring rotor.
In some embodiments of the invention, the ring structure of the lower stirring stator is provided with rectangular holes arranged circumferentially; furthermore, the plurality of rectangular holes are obliquely arranged along the circumferential direction, and the oblique direction is the same as the rotating direction of the lower stirring rotor; further the angle of inclination of the rectangular holes is 40-50 deg..
In some embodiments of the invention, the gap has a diameter of 0.9 to 1.5 mm; preferably 1-1.2 mm.
In some embodiments of the invention, the mixer further comprises a flow guide sleeve positioned above the upper stirring stator; and a baffle is arranged on the inner side wall of the air guide sleeve.
The invention relates to a shearing and stirring device in the production process of polytetrafluoroethylene powder, which is used for grinding large polymerized polytetrafluoroethylene particles with the particle size of more than 400 microns into particles with the particle size of about 200 microns.
The good polytetrafluoroethylene large granule of polymerization gets into by shearing agitating unit's top, then flow by the bottom, from top to bottom in proper order through last stirring stator 3, go up stirring rotor 4, well stirring stator 5, stirring rotor 7 down, stirring rotor 4 is gone up in the central rotation axis area, stirring rotor 7 is rotatory down, go up stirring stator 3, well stirring stator 5 is motionless relatively, utilize stirring stator 3, it has the clearance to go up to set up between the stirring rotor 4, utilize L type clearance to carry out the grinding then through well stirring stator, the stirring rotor falls down after, well stirring stator sets up the clearance with stirring rotor down, then utilize this clearance to carry out the grinding of granule. Sheared with a clearance face.
During the use process, adding polytetrafluoroethylene large particles and water, and then shearing to ensure that the materials are stirred with the water and enter a gap to be sheared; meanwhile, water can clean other chemical substances remained in the materials.
In one embodiment, the central rotating shaft is driven by a motor to realize rotary shearing.
As shown in fig. 1, it can be seen that the upper stirring stators 3 and the upper stirring rotors 4 are arranged in a staggered manner, and the material passes from the upper stirring stators to the upper stirring rotors and then passes through the gap, so that the grinding using the gap is realized. The upper stirring stator is relatively immovable, the upper stirring rotor has a blade structure, and the alternate grinding process continuously occurs between the upper fixed teeth 8 and the upper stirring rotor 4.
A gap is formed between the upper fixed teeth 8 of the upper stirring stator 3 and the upper stirring rotor, and continuous grinding is realized in the rotating process of the upper stirring rotor.
A gap is formed between the lower surface of the middle stirring stator 5 and the upper surface of the blade of the lower stirring rotor, and continuous grinding is realized in the process that the blade continuously rotates.
Lower stirring rotor 7 is open impeller column structure, forms the clearance for blade and well stirring stator 5, and in order to accept the material simultaneously, impeller column structure makes the material take place continuous whirl process, and the material can not downward flow again on stirring rotor 7 down, but continuous entering into the clearance, flows from the blade clearance, takes place the process of grinding, improves the effect of grinding.
The upper stirring stator 3 and the middle stirring stator 5 are both in circular ring structures, form a certain distance with the central rotating shaft, and enclose a stirring space inside. The upper stirring rotor 4 rotates in the center to drive the liquid to rotate and flow, so that the liquid with particles continuously enters the gap for grinding.
The particles are continuously brought into the gap for grinding, and the invention solves the problem of grinding particles of micron size to smaller particles.
In addition, the shearing and stirring device of the invention also comprises the following structures:
the clearance between the upper stirring stator and the upper stirring rotor is an L-shaped clearance which comprises a clearance between an upper structure and a lower structure and a clearance between a left structure and a right structure. Through the L-shaped gap, the particles are continuously ground along the horizontal gap and the vertical gap.
In one embodiment, the upper stirring stator is connected to the bottom structure of the shear stirring device by a fixing screw.
The number of the upper fixed teeth of the upper stirring stator 3 is 6-10; preferably 8. The upper surface of the upper fixed teeth 8 is provided with a downward inclined surface; the further inclination is 5-20 deg.. The 8 teeth extend from the periphery to the center, and the side surface of each tooth is provided with a certain inclination in the vertical direction, so that the flow field resistance is better reduced. The lower surface of each tooth is parallel to the horizontal direction in order to engage with the upper surface of the upper stirring rotor 4 to facilitate the grinding.
The upper fixed teeth 8 are arranged obliquely in the circumferential direction. I.e. the upper stationary teeth 8 are inclined in the same direction and in the circumferential direction. The material is rotated and stirred along one direction.
The upper stirring stator 3 comprises an outer annular fixed body 9 which is connected with the outer end of the upper fixed teeth 7 and has a structure extending downwards relative to the upper fixed teeth. By means of the downwardly extending structure, a vertical gap can be formed, along which the shearing takes place.
The number of the blades 11 of the upper stirring rotor 4 is 6-10; preferably 8. The lower surfaces of the blades 11 of the upper stirring rotor 4 have slopes inclined upward. The end face of each tooth is trapezoidal, and the side surface of each tooth is provided with a certain inclination (5-20 degrees) in the vertical direction, so that the aim of reducing the flow field resistance is better.
The lower annular inclined part 12 of the inner side wall of the middle stirring stator 5, the inclined part 12 points to the inner side of the circle center of the middle stirring stator from the inner side wall, and the wall thickness of the lower part is larger than that of the upper part. The inclined part of the middle stirring stator can slide down along the inclined part towards the materials above.
The bottom surface of the inclined part 12 has an upward inclined surface pointing to the direction of the center of the circle; the angle 17 of the further inclined surface is 3-6. The whole lower surface is provided with a certain upward inclination in the horizontal direction so as to be matched with the upper surface of the lower stirring rotor.
In one embodiment, the outer bottom edge of the middle stirring stator 5 is fixedly connected with the shearing device, and the middle stirring stator is kept relatively immovable.
The blades 13 of the lower stirring rotor 7 are arranged at a position close to the outer edge of the turntable; the number of further blades 13 is 8-20. The blades are arranged at the position close to the outer edge so as to form a gap between the stirring stators, and the quantity of the blades is increased to play a role of further crushing when the materials flow out from the side direction.
The top surface of the blade 13 has a downward slope directed outward of the center of the circle. The convenient and stirring stator between form the clearance of slope, make the material along the clearance of slope by the grinding, the slope sets up, makes things convenient for the material direct access of top.
The turntable is provided with a plurality of through holes 14 which are located at the inner side of the blade. In order to maintain the dynamic balance during high-speed stirring operation.
The stirring device also comprises a lower stirring stator 6 which is of a ring-shaped structure and is positioned at the outer side of the lower stirring rotor 7. The ring body structure of the lower stirring stator 6 is provided with rectangular holes which are circumferentially arranged; further, a plurality of rectangular holes 15 are obliquely arranged along the circumferential direction. The lower stirring stator is arranged at the outer side of the lower stirring rotor 7, and after the materials pass through the lower stirring rotor, the materials pass through the lower stirring stator 6 to be further intensively ground.
The rectangular holes 15 enable the sheared particles to pass through the holes and impact on the kettle wall at a high speed along the tangential direction, and further crushing effect is achieved. The side surface of the hole forms a certain angle along the horizontal direction, and the angle is the same as the rotating direction of the stirrer.
In conclusion, in the process from top to bottom, the upper stirring rotor and the lower stirring rotor rotate the mixture of liquid water and particles, so that rotational flow is formed inside the shearing device, the water drives the particles to enter the gap for grinding, and static resistance and dynamic resistance are applied to the particles in the flowing process.
The diameter of the gap is 0.9-1.5 mm; preferably 1-1.2 mm. The diameter size in clearance can make the comminuted more even, more thin.
The device also comprises a flow guide cover 1 which is positioned above the upper stirring stator 3; the baffle 2 is arranged on the inner side wall of the air guide sleeve 1. The material can be screwed into the center of the stirrer, and the stirring efficiency is improved.
The stirred material enters an airflow drying system, and the water content of the polytetrafluoroethylene powder can be reduced to be below 0.2%. Then enters a jet mill and can be milled to below 50 microns.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A shearing stirring device in the production process of polytetrafluoroethylene powder is characterized in that: comprises a plurality of components from the top to the bottom,
the upper stirring stator is of a circular ring structure, and upper fixed teeth are arranged on the inner side of the circular ring along the circumferential direction;
an upper stirring rotor having a paddle rotating structure;
a middle stirring stator, a circular ring type structure;
the lower stirring rotor is provided with an open impeller-shaped structure and comprises a rotary disc and blades arranged on the rotary disc;
the central rotating shaft passes through the inner sides of the upper stirring stator and the middle stirring stator, and the upper stirring rotor and the turntable are connected with the central rotating shaft; a gap is arranged between the upper stirring stator and the upper stirring rotor, and a gap is arranged between the middle stirring stator and the lower stirring rotor;
the upper surface of the upper fixed teeth is provided with a downward inclined surface; the inclination is 5-20 degrees; the upper fixed teeth are arranged in an inclined manner along the circumferential direction;
the upper stirring stator comprises an outer annular fixed body, is connected with the outer side end part of the upper fixed teeth and has a structure extending downwards relative to the upper fixed teeth;
the lower surface of the blade of the upper stirring rotor is provided with an inclined plane which is inclined upwards; the inclination is 5-20 degrees;
the bottom surface of the inclined part is provided with an upward inclined surface pointing to the direction of the circle center; the angle of the inclined plane is 3-6 degrees;
the lower annular inclined part of the inner side wall of the middle stirring stator points to the inner side of the circle center of the middle stirring stator from the inner side wall, and the wall thickness of the lower part is greater than that of the upper part;
the top surface of the blade is provided with a downward inclined surface pointing to the outer side of the circle center;
the turntable is provided with a plurality of through holes, and the through holes are positioned on the inner sides of the blades.
2. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the number of the upper fixed teeth of the upper stirring stator is 6-10.
3. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the number of the upper fixed teeth of the upper stirring stator is set to be 8.
4. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the number of the blades of the upper stirring rotor is 6-10.
5. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the number of blades of the upper stirring rotor is 8.
6. The shearing agitation device in the production of polytetrafluoroethylene powder as set forth in claim 1, wherein: the blades of the lower stirring rotor are disposed near the outer edge of the turntable.
7. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the number of blades of the lower stirring rotor is 8-20.
8. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the lower stirring stator is of a ring-shaped structure and is positioned on the outer side of the lower stirring rotor.
9. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the ring structure of the lower stirring stator is provided with rectangular holes which are circumferentially arranged.
10. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the plurality of rectangular holes are obliquely arranged along the circumferential direction, and the oblique direction is the same as the rotating direction of the lower stirring rotor.
11. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the inclination angle of the rectangular holes is 40-50 degrees.
12. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the diameter of the gap is 0.9-1.5 mm.
13. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the diameter of the gap is 1-1.2 mm.
14. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the stirring device also comprises a flow guide cover which is positioned above the upper stirring stator.
15. The shear stirring apparatus for polytetrafluoroethylene powder production as set forth in claim 1, wherein: the inner side wall of the air guide sleeve is provided with a baffle.
CN202110572130.2A 2021-05-25 2021-05-25 Shearing and stirring device in polytetrafluoroethylene powder production process Active CN113368988B (en)

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Application Number Priority Date Filing Date Title
CN202110572130.2A CN113368988B (en) 2021-05-25 2021-05-25 Shearing and stirring device in polytetrafluoroethylene powder production process

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Application Number Priority Date Filing Date Title
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CN113368988B true CN113368988B (en) 2022-08-26

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Publication number Priority date Publication date Assignee Title
CN105561854B (en) * 2016-02-22 2018-02-09 上海诚兴机械电子有限公司 With multi-layer impeller structure inner-outer circulation homogenizer
CN208005964U (en) * 2018-01-24 2018-10-26 青岛顺运通运输装备有限公司 Mortar stock stirring device
CN208436703U (en) * 2018-02-09 2019-01-29 广东润洁日化有限公司 A kind of extrusion shearing blender
CN209934541U (en) * 2019-03-08 2020-01-14 山东嘉源农业科技有限公司 Solid fertilizer mixing arrangement
CN110292881B (en) * 2019-08-02 2022-01-18 湘潭大学 Spiral and blade type composite stirrer with special-shaped dispersion disc and comb spoiler

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