CN111715418A

CN111715418A - Composite grading equipment

Info

Publication number: CN111715418A
Application number: CN202010701312.0A
Authority: CN
Inventors: 郑艳; 闵凡飞; 方菲; 陈军; 刘春福; 吕凯; 任豹; 王传真
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-09-29
Anticipated expiration: 2040-07-20
Also published as: CN111715418B

Abstract

The invention discloses composite grading equipment which comprises an inner grading device, a stirring device, a rotary driving device and an outer grading device. The inner grading device is used for realizing primary grading sedimentation of mineral particles, and the stirring device is positioned above the outer part of the inner grading sedimentation device; the upper part of the rotary driving device is positioned above the outer part of the inner grading device, and the lower part of the rotary driving device is positioned below the outer part of the inner grading device and is used for providing driving force for the rotary motion of the equipment; the outer grading device is used for realizing rapid agglomeration, grading and sedimentation of fine mineral particles, the outer grading device is positioned outside the rotary driving device, and the top of the rotary driving device is positioned above the top of the outer grading device. According to the invention, the gravity and the centrifugal force have synergistic effect, so that the mineral particles can be subjected to classification sedimentation and then agglomeration sedimentation in the same device, the use efficiency of the medicament is effectively improved, the classification efficiency and the classification precision of the mineral particles are improved, and the device has the advantages of small occupied area, low energy consumption, easiness in operation, low cost and the like.

Description

Composite grading equipment

Technical Field

The invention belongs to the technical field of grading equipment, and particularly relates to composite grading equipment.

Background

The grading equipment is widely applied to separation of ore materials, coal and other granular matters or powdery matters, and the fine particles in underflow are increased due to inaccurate grading precision and low grading efficiency in the grading process. The key of the classification is to improve the classification precision and the classification efficiency of the operation.

The common screen mesh is classified accurately according to the granularity, but the screen mesh is easy to block holes and seriously abraded; the hydraulic classification is carried out according to the fuzzy classification of the settling velocity, the equipment structure is simple, the operation cost is low, but the occupied area is large, and the classification precision and the classification efficiency are low; the centrifugal classification is carried out according to the fuzzy classification of the radial speed difference, the occupied area of equipment is small, the processing capacity is large, the classification efficiency is higher, but the classification precision is lower and the energy consumption is higher; the equipment combining screening and hydraulic classification combines particle size classification and sedimentation (centrifugal) speed differential classification, can effectively improve classification precision and classification efficiency, but has low treatment capacity, high energy consumption, strict use conditions and the like.

In order to effectively solve the problems of classification efficiency and classification precision of classification equipment, some solutions are also proposed in the existing patent documents. The application number is 201810131344.4's chinese patent discloses a whirl classifying column and uses it to ore pulp coarse and fine particle classification, and the device passes through the screen cloth and grades, can realize the whirl of two products of coarse grain and fine particle and grade, can improve classification accuracy and classification efficiency to a certain extent, nevertheless adopts the tube-shape screen cloth, can't avoid the stifled hole problem of screen cloth, and the coarse grain is directly discharged after once grading simultaneously, and difficult the meeting of exempting from in the coarse grain is mingled with the fine particle. The patent with publication number CN268493Y discloses a hydrocyclone with a filter screen, which is characterized in that the filter screen is arranged between a feeding pipe and an overflow pipe, the diameter and the shape of the filter screen are consistent with the axial zero-speed envelope surface of the hydrocyclone, the lower part of the filter screen is open, the upper part of the filter screen is connected with the top of a feeding cavity, the problem of overflow thickness running can be solved to a certain extent, but the problem of underflow thinness is still not solved; the invention patent of publication No. CN101844115A discloses a cyclone classifying screen for three products, which is characterized in that a cylindrical screen is connected with the lower port of a cylindrical guide cylinder of a cyclone, the cylindrical screen is sleeved in the cylinder of the cyclone, a conical screen is sleeved in the conical cylinder, water is supplied to the conical cylinder, a guide disc is arranged between a central pipe and the conical screen, fine particles are screened by passing through the screen by using the pressure difference of the cyclone outside the lower side wall of a strong centrifugal force field, the coarse circulation running near the side wall and the top cover of the cyclone is eliminated, the upper limit rate in overflow and the lower limit rate in underflow are effectively controlled, and the classifying efficiency and the treating capacity of the cyclone are improved. The existing grading equipment can improve the grading efficiency and the grading precision to a certain extent, but if the rapid grading sedimentation and agglomeration of minerals are to be realized, the mineral grading equipment needs to be realized on different equipment, the required equipment is more, the occupied area of the equipment is large, the energy consumption is high, the cost is high, the medicament use efficiency is low, and the medicament waste is serious.

Disclosure of Invention

The invention aims to provide a composite grading device, which realizes grading sedimentation and agglomeration sedimentation of mineral particles in the same device under the synergistic action of gravity and centrifugal force, effectively improves the use efficiency of a medicament, improves the grading efficiency and the grading precision of the mineral particles, reduces the occupied area, and reduces the energy consumption and the cost.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

A composite classification apparatus includes an inner classification device, a stirring device, a rotation driving device, and an outer classification device. Wherein, the inner grading device is the preliminary grading sedimentation device of the invention, and the stirring device is positioned above the outer part of the inner grading device; the upper part of the rotary driving device is positioned above the outer part of the inner grading device, and the lower part of the rotary driving device is positioned below the outer part of the inner grading device and is used for providing driving force for the rotary motion of the equipment; the external grading device is the agglomeration grading sedimentation device and is positioned outside the rotary driving device, and the top of the rotary driving device is positioned above the top of the external grading device.

The inner grading device comprises an inner column barrel, a feeding guide cylinder, an inner cone barrel and an overflow pipe. The feeding guide cylinder is fixed above the top of the inner column cylinder, tangential feeding ports are symmetrically arranged on two sides of the feeding guide cylinder, and an outermost inlet of each tangential feeding port is positioned on the outer side of the upper part of the outer grading device; the inner cone cylinder is positioned below the bottom of the inner cylinder, the top of the inner cone cylinder and the bottom of the inner cylinder are arranged in a first annular groove at the bottom of the inner side of the rotary cylinder, and the bottom of the inner cone cylinder is a coarse particle discharge hole; the overflow pipe be major diameter's cylinder pipeline, its bottom is located the inside top of interior column casing, the top of overflow pipe is fixed in the top of pan feeding draft tube, the face that the upper portion of overflow pipe and the top of pan feeding draft tube are connected is the arcwall face, prevents that the overflow granule from gathering in pan feeding draft tube top, the top of overflow pipe is the overflow granule discharge gate.

The stirring device comprises an upper ear seat, a telescopic rod, a lower ear seat and a stirring body. Wherein, last ear seat fixed mounting on the pan feeding draft tube, the top and the last ear seat of telescopic link pass through round pin fixed connection, the bottom and the lower ear seat of telescopic link pass through round pin fixed connection, lower ear seat fixed mounting is on the stirring body, the stirring body is more than or equal to 100 and is less than 120 arc pieces, it all has threely to go up ear seat, telescopic link, lower ear seat and the stirring body, the telescopic link, lower ear seat and the stirring body are arranged in the cavity inslot of a rotatory section of thick bamboo, and the stirring body bottom is located the bottom top in cavity groove, the height of the stirring body can be adjusted as required.

The rotary driving device comprises a rotary cylinder, a rotary shaft, a bearing body, a supporting lug seat, a mounting seat, a driving motor and a cylindrical screen. The rotary drum is arranged outside the inner cylindrical drum and coaxial with the inner cylindrical drum, the top of the inner side of the rotary drum is arranged below the bottom of the feeding guide drum, the inner side of the rotary drum is arranged between the stirring device and the inner cylindrical drum and is close to the outside of the inner cylindrical drum, a rotary shaft is fixed at the top of the outer side of the rotary drum, the outer bottom of the inner side of the rotary drum protrudes outwards and the inner bottom of the outer side protrudes inwards to form a hollow groove, the bottom of the hollow groove is a discharge port for agglomerated particles, the inner bottom of the inner side of the rotary drum is connected with the inner bottom of the outer side of the rotary drum through four arc-shaped reinforcing ribs, the top of the outer side of the rotary drum is slightly lower than the top of the inner side, the inner diameter of the stirring body is slightly larger than the protruding diameter of the outer bottom of the inner side of the rotary drum; the rotating shaft is connected with the driving motor through a supporting lug seat fixed in the top of the outer grading device, a through hole in the top of the outer grading device and a mounting seat above the top of the outer grading device, a bearing body is arranged above the supporting lug seat, the bearing body comprises a bearing and a bearing seat, the bearing is used for supporting and fixing the rotating shaft, the bearing seat is used for fixing and mounting the bearing, and a circular stop block is arranged on the rotating shaft above the bearing body and used for fixing the bearing body; the cylindrical screen is arranged below the bottom of the rotary cylinder, the top of the cylindrical screen and the bottom of the rotary cylinder are arranged in a second annular groove at the bottom of the outer cylinder, the screen bars of the cylindrical screen are longitudinally arranged, the screen bar spacing of the cylindrical screen can be adjusted in sliding grooves at the top and the bottom of the cylindrical screen as required, an arc-shaped baffle with adjustable height is arranged outside the cylindrical screen, and the bottom of the cylindrical screen is a screen undersize particle discharge hole; the rotation axis have three, evenly arrange in the top of a rotatory section of thick bamboo, the support ear seat have threely, evenly arrange in the top of outer column casing, the mount pad has threely, evenly arrange in the top of outer column casing for fixed driving motor, driving motor have three, evenly arrange on the mount pad, the bearing body have threely, evenly arrange in support ear seat top.

The outer grading sedimentation device comprises an outer column barrel, an outer cone barrel and a dosing pipe. Wherein, the outer column cylinder is arranged outside the rotary cylinder, and the top of the outer column cylinder is positioned above the top of the overflow pipe; the outer cone is positioned below the outer cylinder, the bottom of the outer cone is fixedly connected with the top of the outer cylinder through bolts, and the bottom of the outer cone is a screened particle discharge hole; the medicine feeding pipe has three parts which are evenly arranged below the top of the outer column casing, and the three medicine feeding ports have the same specification, thereby being convenient for realizing multi-point medicine feeding and improving the sedimentation speed of mineral fine particles.

When the device is used, ore pulp to be separated enters a feeding guide cylinder from a tangential feeding port at a certain speed under a certain pressure through a pump and then enters an inner cylindrical shell, slurry performs spiral downward centrifugal motion under the action of initial acting force, the gravity borne by coarse particles is large, the coarse particles move downward in the inner cylindrical shell under the action of gravity, enter an inner conical shell 1 and then are discharged through a coarse particle discharging port at the bottom of the inner conical shell, the gravity borne by fine particles is small, the fine particles move upward in the inner cylindrical shell and then overflow from an overflow port at the top of an overflow pipe, and then the fine particles overflow from the overflow port and enter a rotary cylinder; a frequency converter button of a rotary driving motor, wherein the rotary driving motor drives a rotary drum to rotate through driving a rotary shaft so as to drive the cylindrical screen to rotate; simultaneously, the medicament enters the rotary cylinder from the medicament feeding pipe at a certain speed under a certain pressure, the medicament and overflow particles are accelerated to be mixed and agglomerated under the action of the stirring body, the particles after being mixed and agglomerated move downwards along the inner wall of the rotary cylinder under the action of gravity, and part of fine particles enter the outer conical cylinder through the strip-shaped screen mesh of the cylindrical screen mesh to become sieve-permeable particles which are discharged through a sieve-permeable particle discharge hole at the bottom of the outer conical cylinder; larger particles will continue to move downward under the action of gravity and will be discharged from the undersize particle discharge port at the bottom of the cylindrical screen. After agglomeration, classification and settlement are completed, a frequency converter button of the motor is rotationally driven, the rotating speed is adjusted to 0, and a power switch is turned off.

Compared with the prior art, the invention has the advantages that the gravity and the centrifugal force have synergistic effect, the rapid grading sedimentation and the agglomeration sedimentation can be realized in the same equipment, the use efficiency of the medicament can be effectively improved, the use amount of the medicament is saved, the invention has the advantages of small occupied area, low energy consumption, high grading efficiency and the like, and the defects of the prior art can be overcome.

Drawings

FIG. 1 is a schematic diagram of the general structure of the present invention;

fig. 2 is a schematic structural diagram of an internal grading device and a stirring device of the invention.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.

As shown in fig. 1, a composite classification apparatus includes an inner classification device 1, a stirring device 2, a rotation driving device 3, and an outer classification device 4. Wherein, the internal classification device 1 is a preliminary classification sedimentation device of the invention, and the stirring device 2 is positioned above the outside of the internal classification device 1; the upper part of the rotary driving device 3 is positioned above the outer part of the inner grading device 1, and the lower part of the rotary driving device is positioned below the outer part of the inner grading device 1 and is used for providing driving force for the rotary motion of the equipment; the outer classifier 4 is an agglomeration classifying sedimentation device of the present invention, and is located outside the rotary drive device 3, and the top of the rotary drive device 3 is located above the top of the outer classifier 4.

As shown in figures 1 and 2, the internal grading device 1 comprises an internal column barrel 11, a feeding guide barrel 12, an internal cone barrel 13 and an overflow pipe 14. The feeding guide cylinder 12 is fixed above the top of the inner column cylinder 11, tangential feeding ports 121 are symmetrically arranged on two sides of the feeding guide cylinder 12, and an outermost inlet of the tangential feeding ports 121 is positioned on the outer side of the upper part of the outer grading device 4; the inner cone cylinder 13 is positioned below the bottom of the inner cylinder 11, the top of the inner cone cylinder 13 and the bottom of the inner cylinder 11 are arranged in a first annular groove 311 at the bottom of the inner side of the rotary cylinder 31, and the bottom of the inner cone cylinder 13 is provided with a coarse particle discharge hole 131; the overflow pipe 14 is a large-diameter cylinder pipeline, the bottom of the overflow pipe is located above the inner part of the inner cylinder 11, the top of the overflow pipe 14 is fixed above the top of the feeding guide cylinder 12, the surface of the upper part of the overflow pipe 14 connected with the top of the feeding guide cylinder 12 is an arc surface, overflow particles are prevented from being gathered at the top of the feeding guide cylinder 12, and the top of the overflow pipe 14 is an overflow particle discharge port 141.

As shown in fig. 1 and 2, the stirring device 2 includes an upper ear seat 21, a telescopic rod 22, a lower ear seat 23 and a stirring body 24. Wherein, last ear seat 21 fixed mounting on pan feeding draft tube 12, the top and last ear seat 21 of telescopic link 22 pass through round pin fixed connection, the bottom and the lower ear seat 23 of telescopic link 22 pass through round pin fixed connection, lower ear seat 23 fixed mounting is on stirring body 24, stirring body 24 is more than or equal to 100 and is less than 120 arc pieces, go up ear seat 21, telescopic link 22, lower ear seat 23 and stirring body 24 all have threely, telescopic link 22, lower ear seat 23 and stirring body 24 arrange in the hollow groove 313 of a rotatory section of thick bamboo 31, and stirring body 24 bottom is located the bottom top of hollow groove 313, stirring body 24 highly can adjust as required.

As shown in fig. 1, the rotary drive device 3 includes a rotary drum 31, a rotary shaft 32, a bearing body 33, a support lug 34, a mounting seat 35, a drive motor 36 and a cylindrical screen 37. Wherein, the rotating cylinder 31 is arranged outside the inner cylinder 11 and is coaxial with the inner cylinder 11, the top of the inner side of the rotary cylinder 31 is arranged below the bottom of the feeding guide cylinder 12, the inner side of the rotary cylinder 31 is arranged between the stirring device 2 and the inner column cylinder 11 and is tightly close to the outer part of the inner column cylinder 11, the top of the outer side of the rotary cylinder 31 is fixed with a rotary shaft 32, the bottom of the outer side of the rotary cylinder 31 protrudes outwards and the bottom of the inner side protrudes inwards to form a hollow groove 313, the bottom of the hollow groove is a discharge hole 312 for agglomerated particles, the bottom of the inner outer side of the rotary cylinder 31 is connected with the bottom of the outer inner side through four arc-shaped reinforcing ribs, the top of the outer side of the rotating cylinder 31 is slightly lower than the top of the inner side, the inner diameter of the stirring body 24 is slightly larger than the convex diameter of the bottom of the outer side of the rotating cylinder 31, and the outer diameter of the stirring body 24 is slightly smaller than the convex diameter of the bottom of the inner side of the rotating cylinder 31; the rotating shaft 32 is connected with a driving motor 36 through a supporting lug seat 34 fixed in the top of the outer grading device 4, a through hole in the top of the outer grading device 4 and a mounting seat 35 above the top of the outer grading device 4, a bearing body 33 is installed above the supporting lug seat 34, the bearing body 33 comprises a bearing and a bearing seat, the bearing is used for supporting and fixing the rotating shaft 32, the bearing seat is used for fixing and installing the bearing, and a circular stop block 321 is installed on the rotating shaft 32 above the bearing body 33 and used for fixing the bearing body 33; the cylindrical screen 37 is arranged below the bottom of the rotary cylinder 31, the top of the cylindrical screen 37 and the bottom of the rotary cylinder 31 are arranged in a second annular groove 412 at the bottom of the outer cylinder 41, the screen bars of the cylindrical screen 37 are longitudinally arranged, the spacing between the screen bars of the cylindrical screen 37 can be adjusted in chutes 372 at the top and the bottom of the cylindrical screen 37 as required, an arc-shaped baffle 371 with adjustable height is arranged outside the cylindrical screen 37, and a particle discharge port 373 below the screen is arranged at the bottom of the cylindrical screen 37; rotation axis 32 have three, evenly arrange in the top of a rotatory section of thick bamboo 31, support ear seat 34 have three, evenly arrange in the top of outer column casing 41, mount pad 35 has threely, evenly arrange in the top of outer column casing 41 for fixed driving motor 36, driving motor 36 have three, evenly arrange on mount pad 35, bearing body 33 have threely, evenly arrange in support ear seat 34 top.

As shown in fig. 1, the external classifying and settling device 4 comprises an external cylindrical shell 41, an external conical shell 42 and a dosing pipe 43. Wherein, the outer cylinder 41 is arranged outside the rotary cylinder 31, and the top of the outer cylinder is positioned above the top of the overflow pipe 14; the outer conical cylinder 42 is positioned below the outer cylindrical cylinder 41, the bottom of the outer conical cylinder 42 is fixedly connected with the top of the outer cylindrical cylinder 41 through bolts, and the bottom of the outer conical cylinder 42 is provided with a screened particle discharge hole 421; the medicine adding pipes 43 are three and evenly arranged below the top of the outer column casing 41, and the specifications of the three medicine adding openings 43 are completely the same, so that the medicine can be added at multiple points conveniently, and the settling speed of mineral fine particles is improved.

When the slurry separation device is used, slurry to be separated enters the feeding guide cylinder 12 from the tangential feeding port 121 under a certain pressure and a certain speed through the pump and then enters the inner cylindrical barrel 11, the slurry performs spiral downward centrifugal motion under the action of initial acting force, the gravity borne by coarse particles is large, the coarse particles move downward in the inner cylindrical barrel 11 under the action of gravity and enter the inner conical barrel 13, then the slurry is discharged through the coarse particle discharging port 131 at the bottom of the inner conical barrel 13, the gravity borne by fine particles is small, the fine particles move upward in the inner cylindrical barrel 11, then the fine particles overflow from the overflow port 141 at the top of the overflow pipe 14 and enter the rotary cylinder 31; a frequency converter button of a rotary driving motor 36, wherein the rotary drum 31 is driven to rotate by the driving motor 36 through a driving rotating shaft 32, and then the cylindrical screen 37 is driven to rotate; meanwhile, the medicament enters the rotary cylinder 31 from the medicament feeding pipe 43 at a certain speed under a certain pressure, the medicament and overflow particles are accelerated to be mixed and agglomerated under the action of the stirring body 24, the particles after being mixed and agglomerated move downwards along the inner wall of the rotary cylinder 31 under the action of gravity, and part of fine particles enter the outer conical cylinder 42 through the strip-shaped screen mesh of the cylindrical screen mesh 37 to become sieve-permeable particles which are discharged through a sieve-permeable particle discharge hole 421 at the bottom of the outer conical cylinder 42; the larger particles will continue to move downward under the force of gravity and exit through undersize particle outlet 373 at the bottom of cylindrical screen 37. After agglomeration, classification and sedimentation are completed, the frequency converter button of the motor 36 is driven to rotate, the rotating speed is adjusted to 0, and the power switch is turned off.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A composite classification device comprises an inner classification device, a stirring device, a rotary driving device and an outer classification device, and is characterized in that: the stirring device is positioned above the outer part of the inner grading device; the upper part of the rotary driving device is positioned outside the stirring device, and the lower part of the rotary driving device is positioned below the outside of the inner grading device; the outer grading device is positioned outside the rotary driving device, and the top of the rotary driving device is positioned above the top of the outer grading device;

the inner grading device consists of an inner column barrel, a feeding guide cylinder, an inner cone barrel and an overflow pipe, wherein the feeding guide cylinder is fixed above the top of the inner column barrel, tangential feeding ports are symmetrically arranged on two sides of the feeding guide cylinder, and an outermost inlet of each tangential feeding port is positioned on the outer side of the upper part of the outer grading device; the inner cone cylinder is positioned below the bottom of the inner cylinder, the top of the inner cone cylinder and the bottom of the inner cylinder are arranged in a first annular groove at the bottom of the inner side of the rotary cylinder, and the bottom of the inner cone cylinder is a coarse particle discharge hole; the overflow pipe is a large-diameter cylinder pipeline, the bottom of the overflow pipe is positioned above the inner part of the inner cylinder, the top of the overflow pipe is fixed above the top of the feeding guide cylinder, the surface of the upper part of the overflow pipe, which is connected with the top of the feeding guide cylinder, is an arc-shaped surface, and the top of the overflow pipe is an overflow particle discharge port.

The stirring device consists of an upper ear seat, a telescopic rod, a lower ear seat and a stirring body, wherein the upper ear seat is fixedly arranged on the feeding guide cylinder, the top of the telescopic rod is fixedly connected with the upper ear seat through a pin, the bottom of the telescopic rod is fixedly connected with the lower ear seat through a pin, and the lower ear seat is fixedly arranged on the stirring body;

the rotary driving device comprises a rotary cylinder, a rotating shaft, a bearing body, a supporting lug seat, a mounting seat, a driving motor and a cylindrical screen, wherein the rotary cylinder is arranged outside the inner cylindrical shell and coaxial with the inner cylindrical shell, the top of the inner side of the rotary cylinder is arranged below the bottom of the feeding guide cylinder, the inner side of the rotary cylinder is arranged between the stirring device and the inner cylindrical shell and is close to the outside of the inner cylindrical shell, the top of the outer side of the rotary cylinder is fixedly provided with the rotating shaft, the outer bottom of the inner side of the rotary cylinder protrudes outwards and the inner bottom of the outer side protrudes inwards to form a hollow groove, the bottom of the hollow groove is a discharge port for agglomerated particles, and the outer bottom of the inner side of the rotary cylinder and the inner bottom of the outer side of the rotary cylinder are connected through four; the rotating shaft is connected with the driving motor through a supporting lug seat fixed in the top of the outer grading device, a through hole in the top of the outer grading device and a mounting seat above the top of the outer grading device, a bearing body is arranged above the supporting lug seat, the bearing body comprises a bearing and a bearing seat, and a circular stop block is arranged on the rotating shaft above the bearing body; the cylindrical screen is arranged below the bottom of the rotary cylinder, the top of the cylindrical screen and the bottom of the rotary cylinder are arranged in a second annular groove at the bottom of the outer cylinder, and the bottom of the cylindrical screen is a screen undersize particle discharge hole;

the outer grading sedimentation device consists of an outer cylindrical barrel, an outer conical barrel and a dosing pipe, the outer cylindrical barrel is arranged outside the rotary barrel, and the top of the outer cylindrical barrel is positioned above the top of the overflow pipe; the outer cone is located the below of outer cylinder, and the top of its bottom and outer cylinder links firmly mutually through the bolt, outer cone bottom for passing through sieve granule discharge gate, the pencil that adds have three, evenly arrange in the top below of outer cylinder.

2. A composite grading apparatus according to claim 1, characterized in that: the stirring body be more than or equal to 100 and be less than 120 arc pieces, go up ear seat, telescopic link, lower ear seat and the stirring body and all have threely, telescopic link, lower ear seat and the stirring body are arranged in the cavity inslot of rotatory section of thick bamboo, and the stirring body bottom is located the bottom top in cavity groove, the height of the stirring body can be adjusted as required.

3. A composite grading apparatus according to claim 1, characterized in that: the top of the outer side of the rotating cylinder is slightly lower than the top of the inner side of the rotating cylinder, the inner diameter of the stirring body is slightly larger than the convex diameter of the bottom of the outer side of the inner side of the rotating cylinder, and the outer diameter of the stirring body is slightly smaller than the convex diameter of the bottom of the inner side of the outer side of the rotating cylinder.

4. A composite grading apparatus according to claim 1, characterized in that: the screen bars of the cylindrical screen are longitudinally arranged, the spacing between the screen bars of the cylindrical screen can be adjusted in the sliding chutes at the top and the bottom of the cylindrical screen according to requirements, and the outer side of the cylindrical screen is provided with an arc-shaped baffle with adjustable height; the rotation axis have three, evenly arrange in the top of a rotatory section of thick bamboo, the support ear seat have threely, evenly arrange in the top of outer column casing, the mount pad have threely, evenly arrange in the top of outer column casing, driving motor have three, evenly arrange on the mount pad, the bearing body have threely, evenly arrange in support ear seat top.