CN109807062B - High-speed powder screening device and method suitable for amino molding compound - Google Patents

Abstract

The invention relates to high-speed powder screening equipment and a powder screening method suitable for amino molding compounds. The powder sieving host of the equipment comprises a host shell, a fixed sieve and a material guiding device. The main body of the main machine shell comprises a conveyor shell part and a powder sieving machine shell part, and the main machine shell is provided with a material inlet, a fine powder outlet and a coarse powder outlet. The material guiding device is rotationally connected to the shell main body, the spiral conveying part and the centrifugal dispersing part of the material guiding device are respectively arranged in the conveyor shell part and the powder sieving machine shell part of the main machine shell, and a space formed between the spiral conveying part and the conveyor shell part forms a material spiral conveying channel of the powder sieving machine. The fixed screen is fixedly arranged on the shell body, is positioned in the inner cavity of the powder screening machine shell part, and is arranged around the centrifugal dispersing part of the material guiding device. The fine powder discharging component and the coarse powder discharging component are respectively positioned below the fine powder outlet and the coarse powder outlet of the host shell. The equipment has higher efficiency when being used for sieving the powder by the method of the invention, and the coarse powder basically contains no fine powder.

Description

High-speed powder screening device and method suitable for amino molding compound

Technical Field

The invention relates to powder screening equipment, in particular to high-speed powder screening equipment and a powder screening method thereof for screening a powder amino molding compound semi-finished product subjected to ball milling.

Background

Molding compounds, also referred to as thermosets, refer in the present invention to materials that can be molded. Amino molding compounds, also called aminoplasts, are solid materials comprising an amino resin as a main component in a synthetic resin, and are classified into powdery molding compounds and granular molding compounds according to the aggregation state of the product. Because the granular molding compound does not bridge in the skip car (the falling of the granular molding compound is not called bridging), the granular molding compound is more suitable for an automatic thermosetting plastic injection molding machine. . Amino resins are generally classified into urea formaldehyde resins, melamine formaldehyde resins, aniline formaldehyde resins, etc. according to the raw materials used, while amino molding compounds are prepared by adding lubricants, hardeners, pigments and other additives to the corresponding amino resins as main components and cellulose and minerals as fillers, and are sequentially called urea formaldehyde molding compounds, melamine molding compounds and piperidine molding compounds.

There are two conventional methods for producing amino molding compounds. The first is a one-step process and the second is a two-step process. The following description will take urea formaldehyde molding materials as examples.

The one-step process comprises the steps of pulping, vacuum mixing, crushing, screening (or tabletting) and the like. The pulping step is to add formaldehyde and urotropine as catalyst into a pulping tank under stirring, mix, add urea to pulp, keep the temperature of the material below 40 ℃ to make the formaldehyde and urea produce addition reaction to generate monohydroxy methyl urea, and introduce hydroxymethyl group into the system. The vacuum mixing step is to filter the slurry, put the slurry into a stirrer, add the rest urotropine into the stirrer, then add pigment, lubricant and other auxiliary agents, start the stirring paddle to rotate at high speed, enable formaldehyde and urea to generate further addition reaction to generate dimethylol urea, and generate dehydration polycondensation reaction (also called pre-polycondensation reaction) to generate initial urea-formaldehyde resin with a linear structure. And adding cellulose (usually crushed paper scraps) as a filler, starting a heater after the slurry is fully absorbed by the cellulose, and starting vacuumizing when the temperature of the slurry reaches 40 ℃, wherein the vacuum degree is kept below-85 kPa, so that the water content reaches about 4%. And slowly heating the materials until the temperature is raised to 75-80 ℃, reacting for 20 minutes, and discharging. In this step, the viscosity of the material increases continuously as a result of the molecular weight increasing due to the polycondensation reaction. In continuous high-speed stirring, the materials are repeatedly agglomerated and repeatedly dispersed, and finally become uniform particles with basically the same size. The crushing step is to crush the granular materials. The screening step is to take the granular materials with the granularity of 20-100 meshes after the crushing step as the finished product of the amino molding compound through screening. The tabletting step is to press the crushed materials into sheet-shaped finished products with the size of a few millimeters. From the above description, although the flow of the one-step method is relatively short, the sealing property is good, and thus the environmental protection is good. However, there are still more technical problems, firstly, in the vacuum mixing step, the final water content of the material is reduced to about 4%, so that the reaction and vacuum dehydration time is as long as 5 hours, and the energy consumption is high. Secondly, if the color control of the material is not good in the vacuum stirring step, the color of the obtained molding compound finished product cannot be adjusted, and the serious problem can lead to scrapping of the product. Thirdly, for the finished product of the molding compound, if other indexes such as demolding performance, curing time and water content are not suitable for the requirements of users, the adjustment cannot be performed, and if serious, the product is scrapped.

The two-step process is characterized in that the vacuum kneading step is used instead of the vacuum mixing step, and a drying step using special drying equipment is added after the vacuum kneading step instead of directly removing water in the vacuum mixing equipment by adopting a vacuumizing method like the one-step process. Then crushing, ball milling and sieving to obtain a powdery finished product, or granulating the sieved powder to obtain a granular finished product. The kneading in the two-step method is advantageous for addition and pre-polymerization, and there is no strict requirement on the water content and the degree of reaction of pre-polymerization in the vacuum kneading due to the specially provided drying step. Therefore, the time of the vacuum kneading step can be relatively short, so that the energy consumption is reduced. In the ball milling step, the yield is higher because relevant auxiliary raw materials can be added during feeding. However, the powder screening step in the two-step method is low in efficiency and heavy in environmental pollution. Firstly, when the ball mill discharges powder, the powder falls into the skip car, so that dust flies. Secondly, when the skip car is transported to an operation platform of the powder sieving machine, the manual material spoon is added into the inlet of the powder sieving machine, so that not only is the feeding uneven, but also the dust raised during feeding has great damage to the health of workers. Thirdly, the rotary screen is adopted, so that the problems of powder leakage and the like exist.

Chinese patent document CN202238612U (application No. 20120381503. X) discloses a powder and granular material screening device. The document uses a rotary screen. This document mentions in paragraph [ 0018 ] of its specification: the screening equipment is characterized in that a rotating shaft is arranged on a machine body, a cylindrical screen basket is connected on the rotating shaft, the rotating shaft is arranged at the axial center position of the screen basket, a screen is arranged at the inner side of the screen basket, the distance between the screen and the inner wall of the screen basket is 5-10cm, the screen basket and the screen can rotate along with the shaft under the condition that the motor drives the rotating shaft, and the screen is of a rigid structure. The feed inlet is disposed above one side of the screen basket and extends into the interior space of the screen to feed the screening apparatus. The coarse powder discharge hole is arranged below the other side of the screen basket and extends to a gap between the screen and the screen basket to receive and transfer unqualified coarse powder materials remained on the screen. After the fine powder product materials pass through the screen, the fine powder product materials are output from a discharge port below the screening equipment, so that the separation of qualified fine powder materials and unqualified coarse materials is realized, and the coarse materials reenter the ball milling equipment. During operation, materials enter the inner space of the screen mesh from the feed inlet and fall onto the screen mesh, the materials move on the screen mesh along with the rotation of the screen mesh and the screen basket, and qualified fine powder falls to the discharge port through the air on the screen mesh and is output as qualified products. The scraper moves relatively to the screen when the screen rotates, and the scraper scrapes accumulated materials onto the screen holes through the blade part so that the materials can be screened. Coarse powder remained on the screen after screening is transferred to the other end of the screen along with the rotation of the screen and falls into a coarse powder discharge hole, and is conveyed to a ball mill for regrinding.

The document also mentions in its paragraph [ 0017 ] that a wiper is fixed inside the screen, the distance between the edge of the wiper and the inside of the screen being 2-4mm. A fixed scraping brush is arranged on the inner side of the screen mesh of the screening device. Both of these descriptions illustrate that the screen is the only member that rotates, whether the wiper or squeegee is a fixedly disposed member. The inventors of the present invention found that: the powder passing through the screen is extruded out of the screen through the brush under the rotation of the screen, and then falls into a discharge hole below the screen to be output under the action of gravity through the screen, and coarse powder is remained on the screen and moves to the other end of the screen along with the rotation of the screen. Because the brush is in very close proximity to the screen, it is not uncommon for the screen to be damaged. The rotating speed of the screen is about 130 revolutions per minute, so that the powder screening efficiency is lower, and the proportion of fine powder in coarse powder is higher.

Disclosure of Invention

The invention aims to provide high-speed powder screening equipment which is simple and reliable in structure, long in service life and high in powder screening efficiency and is suitable for amino molding compounds. A second object of the present invention is to provide a method of screening a coarse powder which is relatively efficient in screening the powder and which is substantially free of fines.

The technical scheme for realizing the first purpose of the invention is as follows: the high-speed powder screening device comprises a frame, a fine powder discharging assembly and a coarse powder discharging assembly. The powder sieving machine also comprises a powder sieving host machine and a motor which are fixedly arranged on the frame. The powder sieving host comprises a host shell, the host shell comprises a shell main body, and the powder sieving host is fixedly arranged on the frame through the shell main body of the host shell. The main machine shell is sequentially provided with a material inlet, a fine powder outlet and a coarse powder outlet on the main machine shell body from left to right, the openings of the material inlet are upward, and the openings of the fine powder outlet and the coarse powder outlet are downward. The fine powder discharging component is positioned below the fine powder outlet of the main machine shell, and the coarse powder discharging component is positioned below the coarse powder outlet of the main machine shell; the structure is characterized in that:

the powder sieving host machine also comprises a fixed sieve and a material guiding device, and is provided with a material spiral conveying channel. The main body of the main body casing comprises a conveyor casing part and a powder screening casing part which are mutually connected and communicated in the left-right direction. The material guiding device comprises a spiral conveying part and a centrifugal dispersing part which are mutually connected in the left-right direction. The material guiding device is rotationally connected to the main body of the main machine shell, and is driven by the motor during use. The spiral conveying part and the centrifugal dispersing part of the material guiding device are respectively arranged in the conveyor shell part and the powder sieving machine shell part of the host machine shell, a space formed between the spiral conveying part and the conveyor shell part is a material spiral conveying channel of the powder sieving host machine, the channel is communicated with the inner cavity of the powder sieving machine shell part, and a material conveying outlet of the channel is positioned at the right end of the channel. The fixed screen is fixedly arranged on the shell main body of the host shell, is positioned in the inner cavity of the powder screening machine shell and is arranged around the centrifugal dispersing part of the material guiding device. The fixed screen comprises a screen mesh and a coarse powder push-out port positioned at the lower part of the right end. The screen cloth is located the fine powder export of host computer shell's top, and the right side outside of the middling push-out mouth of fixed screen is located the top of the middling export of host computer shell.

In the high-speed powder screening device, the shell main body of the host shell further comprises a fixed supporting seat. The conveyor housing portion of the main machine housing is fixedly connected to the left end plate of the screen housing portion from the left side. The fixed support seat is arranged in the powder screening machine shell and is fixedly connected to the left end plate of the powder screening machine shell from the right side.

The fixed screen also includes a screen frame that is an integral piece. The screen frame comprises a frame body. The frame body is in a circular frame shape, and a plurality of frame openings are arranged on the periphery outer side of the frame body. The fixed screen is fixedly connected to the fixed supporting seat through the left port of the frame body of the screen frame.

The screen cloth is fixed to be set up on the circumference outside position of the framework of reel. Wherein, the screen mesh is an integral high-strength woven fiber net and is fixedly arranged on the circumferential outer side part of the frame body of the screen frame and covers all frame openings on the circumferential outer side of the frame body of the screen frame; or the screen is divided into a plurality of stainless steel wire meshes, and each stainless steel wire mesh is welded and fixed at a corresponding frame opening on the outer side of the periphery of the frame body of the screen frame; or the screen is divided into a plurality of stainless steel punching nets, and each stainless steel punching net is welded and fixed at a corresponding frame opening on the circumferential outer side of the frame body of the screen frame; or the screen mesh is a whole stainless steel punching net, and is welded and fixed and covered on the circumferential outer side of the frame body of the screen frame.

In the high-speed powder screening device, the frame body of the screen frame of the fixed screen comprises 3 to 6 annular ferrules with the same diameter and 4 to 8 connecting rib plates. The ferrules are arranged in sequence from left to right, and the axes of the ferrules are collinear. The axis is also the central axis of the screen frame. Each connecting rib plate is connected between the adjacent ferrules and is arranged around the circumference in an equal division manner, so that 2 adjacent connecting rib plates and 2 corresponding adjacent ferrules form a corresponding frame opening on the outer side of the circumference of the frame body around. The left-most ferrule sleeve of the frame body of the screen frame of the fixed screen is the left port of the frame body.

The screen frame of the fixed screen also comprises a right baffle. The right baffle is a circular plate, is fixed on one ferrule at the rightmost side in a sealing welding way, and is positioned at the right side of the ferrule. The center of the right baffle is positioned on the central axis of the screen frame, and the lower part of the right baffle is provided with an arch-shaped opening which is used as a coarse powder push-out port of the fixed screen.

In the high-speed powder screening device, the outer diameter of the right baffle of the screen frame of the fixed screen is larger than the outer diameter of the frame body and slightly smaller than the inner diameter of the shell of the powder screening machine.

The high-speed powder screening device further comprises a bearing. The material guiding device comprises a rotating shaft. The rotating shaft is sequentially divided into a left end head, a left section and a right section from left to right. The left end head of the rotating shaft stretches out of the conveyor shell part of the host shell leftwards, the left section of the rotating shaft is positioned in the conveyor shell part of the host shell, and the right section of the rotating shaft is positioned in the powder screening machine shell part. The screw conveying part of the material guiding device comprises a left section of the rotating shaft, a first bearing and a screw blade. The bearing is located to the left of the first bearing. The bearing is connected on the left end of rotation axis, and the bearing passes through the bearing frame and corresponding connecting seat setting in the frame. The first bearing is connected to the left section of the rotating shaft and is arranged at the left end part of the conveyor shell part of the host shell. The helical blade is sleeved and fixed on the left section of the rotating shaft and positioned on the right side of the first bearing. Corresponding material spiral conveying channels are formed between the spiral blades and the conveyor shell, and the material spiral conveying channels are the material spiral conveying channels of the powder screening host machine.

In the high-speed powder screening device, the centrifugal dispersing part of the material guiding device comprises a right section of the rotating shaft, a fixed bracket and a guide plate; the guide plates are provided with 2 to 4 guide plates, and the guide plates are equally arranged around the right section of the rotating shaft in the circumferential direction; each guide plate is fixedly connected to the right section of the rotating shaft through at least 2 fixing supports, and the screen mesh of the fixed screen is arranged around the right section of the rotating shaft and each guide plate.

In the high-speed powder screening device, the guide plates are integrated and are divided into the flat plate part and the guide part according to the distance from the axis of the rotating shaft, and the guide part consists of a plurality of toothed plates, namely, the radial outer part of the guide part is toothed. The toothed plates are arranged in parallel and have an included angle of 10-15 degrees relative to the plane of the flat plate part.

In the high-speed powder screening device, the shell main body of the host shell is an integral piece, and the conveyor shell part comprises a feed pipe and a conveying pipe. The conveying pipe is a cylindrical horizontal pipe body which is provided with a left end plate and horizontally arranged along the left-right direction, the conveying pipe is provided with a right port, and a material inlet is arranged in the middle of the top of the conveying pipe along the left-right direction. A circular through hole is formed in the left end plate of the conveying pipe, and the left end head of the rotating shaft stretches out leftwards from the circular through hole. The feeding pipe is vertically arranged and is a cylindrical pipe body with openings at the upper end and the lower end. The feeding pipe is connected to the material inlet part of the conveying pipe from the upper part through the lower port, and the feeding pipe is communicated with the inner cavity of the conveying pipe. The upper port of the feeding pipe is the material inlet of the host shell. The conveyor shell of the host shell is connected to the left end plate of the powder screening machine shell through the right port of the conveying pipe, the left end plate is provided with a circular through hole, the rotating shaft penetrates through the circular through hole, and the circular through hole is used as a material conveying outlet of the powder screening host. The helical blade is positioned in the conveying pipe of the conveyor shell and below the material inlet of the conveying pipe.

In the high-speed powder screening device, the fine powder discharging assembly comprises a fine powder discharging hopper and a fine powder container bag. The fine powder discharging hopper is a square table shell-shaped integrated piece with a large upper end opening and a small lower end opening and is fixedly connected to a fine powder outlet of the host shell from below through an upper port of the fine powder discharging hopper. When in use, the top opening of the fine powder container bag is tightly tied on the lower end opening of the fine powder discharging hopper. The coarse powder discharging part comprises a coarse powder discharging pipe and a coarse powder container bag. The coarse powder discharging pipe is a circular pipe-shaped integrated piece. When in use, the top opening of the coarse powder container bag is tightly tied on the bottom opening of the coarse powder discharging pipe. The host housing also includes a sealing cover. The sealing cover is arranged at the opening of the right end of the powder sieving machine shell.

The technical scheme for realizing the second purpose of the invention is that the powder screening method of the high-speed powder screening device comprises the following steps:

(1) the top opening of the fine powder container bag is tightly bound on the lower end opening of the fine powder discharging hopper, and the top opening of the coarse powder container bag is tightly bound on the lower port of the coarse powder discharging pipe.

(2) The motor is started, the motor drives the material guiding device of the powder sieving host machine to rotate, so that the rotating shaft of the powder sieving host machine rotates at the rotating speed of 800-1200 revolutions per minute, and the spiral blades simultaneously rotate at the same rotating speed under the drive of the rotating shaft rotating at a high speed.

(3) The powder of the amino molding compound is put into a material inlet of a main machine shell, and under the action of gravity, the powder enters a conveying pipe after passing through a feeding pipe of the main machine shell and falls onto a rotating spiral blade, and then enters a powder screening machine shell part after passing through a material spiral conveying channel of a powder screening main machine from left to right under the driving of the spiral blade.

(4) Along with the high-speed rotation of the rotating shaft, the guide plate rotates at the same high speed to generate centrifugal force, the centrifugal force enables the powder entering the shell of the powder screening machine to move outwards in the circumferential direction, after the powder is impacted on the screen, the fine powder in the powder is extruded through the screen holes of the screen with 75 to 85 meshes and then flies to the inner wall of the shell of the main machine, the initial fine powder is adhered to the inner wall, after a certain amount of fine powder is accumulated, part of the fine powder continuously flying to the inner wall falls down into the fine powder discharging hopper, and finally falls into the fine powder container bag; the powder material which is impacted on the screen mesh is blocked on the inner side of the screen mesh, and moves from left to right under the pushing of the toothed plate of the guide plate until the powder material is pushed out of the fixed screen by the powder material pushing outlet of the screen frame, then falls to the powder material outlet of the shell of the powder screening machine, falls into the powder material discharging pipe and finally falls into the powder material containing bag.

(5) When the fine powder container bag is full of fine powder, the fine powder container bag full of the bag is unfastened from the fine powder discharging hopper and put aside, and then the empty fine powder container bag is replaced; when the coarse powder container bag is full of coarse powder, the coarse powder container bag filled with the coarse powder is unwound from the coarse powder discharge hopper and put aside, and then the empty coarse powder container bag is replaced; and (3) conveying the fine powder flexible container filled with the bags to a finished product warehouse, and conveying the coarse powder flexible container filled with the bags to a ball milling workshop of a previous step for ball milling again.

The invention has the positive effects that: (1) After the traditional rotary screen is replaced by the fixed screen, the screen is in a static state, so that the rotating speed of the motor can be greatly increased, the original 130-rpm speed can be increased to 800-1200-rpm speed, powder is driven by centrifugal force generated by the rotation of the guide plate to be thrown to the screen at high speed under the high rotating speed (such as 1000 rpm/min), so that the powder with smaller particles automatically passes through the screen, and the fine powder in the final coarse powder basically does not exist under the rotating speed, namely, the content of the fine powder in the coarse powder is reduced to only 0.1-0.2 wt% from about 10 wt% of the prior art. (2) When the screening device is provided with the screening host and the corresponding motor, the scheme of arranging 2 motors can be adopted in addition to the scheme of adopting one motor in the embodiment 1 of the invention in driving mode, the spiral blades, the guide plates and the fixed support in the embodiment 1 are reserved, and the inner shaft driving piece, the inner shaft, the outer shaft driving piece, the outer shaft and the right sleeve shaft are arranged. The inner shaft driving piece is a first motor. The first motor is fixedly connected with the inner shaft through a corresponding coupler. The left end part of the inner shaft is respectively arranged on the left end parts of the conveyor shell parts of the frame and the host shell through 2 bearings (which can be called as left end bearings) and corresponding bearing seats. The outer shaft driving part comprises a second motor, an active transmission part and a passive transmission part. The outer shaft and the right sleeve shaft are hollow shafts. The outer shaft is rotatably connected to the left side part of the inner shaft through another 2 bearings and is positioned on the right side of the left end bearing, and the outer shaft is sleeved with and fixed with a helical blade, and the left end head of the outer shaft is fixedly connected with a bevel gear or a worm wheel serving as a driven transmission member. In response, a conical gear or worm which is matched with the driving transmission piece and is used as the driving transmission piece and a transmission shaft which is fixedly connected with the driving transmission piece are arranged, and a motor shaft of the second motor is fixedly connected with the transmission shaft through a corresponding coupling. The right sleeve shaft is sleeved and fixed on the right side part of the inner shaft, and each guide plate is fixedly connected on the right sleeve shaft through a corresponding fixing bracket. The arrangement of the double motor driving scheme can enable the rotating speed of the helical blade controlled by the second motor to be adjusted as required when the sieving feeding is carried out, so that the double motor driving scheme is better matched with the sieving treatment capacity controlled by the first motor. (3) The outer diameter of the right baffle plate of the screen frame of the fixed screen of the powder screening device is larger than the outer diameter of the frame body, so that screened fine powder can be blocked on the right side in the screening process, the fine powder is prevented from being mixed into coarse powder, and the screening efficiency is further ensured. (4) The invention can complete screening of powder no matter the high-strength fiber net is used as a screen, or the stainless steel wire net is used as a screen, or the stainless steel punching net is used as a screen. Compared with a rotary screen, the service life of the screen is greatly prolonged. (5) The powder screening device has higher use efficiency, and can effectively prevent dust from flying out and leaking powder after strengthening relevant sealing measures.

Drawings

Fig. 1 is a schematic view of a high-speed powder screening apparatus of the present invention.

Fig. 2 is a schematic diagram of the sifting host of fig. 1.

Fig. 3 is a schematic view of the conveyor casing portion of the main machine casing of fig. 2, the direction of view being the left direction of view of fig. 2.

Fig. 4 is a schematic cross-sectional view A-A of fig. 3.

Fig. 5 is a schematic view of the powder screening machine housing portion of the main machine housing of fig. 2, looking in the left direction of fig. 2.

FIG. 6 is a schematic cross-sectional view of B-B in FIG. 5.

Fig. 7 is a schematic view of the material guiding device of fig. 2.

Fig. 7-1 is a right-side view of fig. 7.

Fig. 8 is a schematic view of the guide plate of fig. 7.

Fig. 9 is a schematic top view of fig. 8.

Fig. 10 is an enlarged partial schematic view at a in fig. 9.

Fig. 11 is a schematic view of the screen frame of fig. 2, the view being in the right view of fig. 2.

FIG. 12 is a schematic cross-sectional view of C-C in FIG. 11.

Fig. 13 is a schematic view of the screen of fig. 2 after being circumferentially expanded.

Fig. 14 is a partial enlarged view at b in fig. 13.

The labels in the above figures are as follows:

the powder sieving machine 10, a machine housing 1, a conveyor casing 11, a feed pipe 11-1, a material inlet 11-1-1, a feed pipe 11-2, a material inlet 11-2-1, a right port 11-2-2, a circular through hole 11-2-3, a powder sieving machine casing 12, a second circular through hole 12-1, a fine powder outlet 12-2, a coarse powder outlet 12-3, a fixed support 13, a sealing cover 14, a fixed sieve 2, a sieve frame 21, a frame 21-1, a first ferrule 21-1-1, a second ferrule 21-1-2, a third ferrule 21-1-3, a fourth ferrule 21-1-4, a fifth ferrule 21-1-5, a connecting rib plate 21-1-6, a frame opening 21-1-7, a right baffle 21-2, the coarse powder pushing-out port 21-2-1, the handle 21-3, the steel pipe 21-3-1, the rubber sleeve 21-3-2, the screen 22, the mesh 22-1, the material guiding device 3, the screw conveying part 3a, the centrifugal dispersing part 3b, the first bearing 30, the rotating shaft 31, the screw blade 32, the fixed bracket 33, the guide plate 34, the flat plate part 34-1, the bolt hole 34-1-1, the toothed plate part 34-2, the toothed plate 34-2-1, the motor 4, the frame 5, the motor bracket 51, the screen powder machine bracket 52, the fine powder discharging component 6, the fine powder discharging hopper 61, the fine powder container bag 62, the supporting plate 63, the coarse powder discharging component 7, the coarse powder discharging pipe 71, the coarse powder container bag 72, the supporting plate 73 and the bearing 8.

Detailed Description

Example 1

Referring to fig. 1, the high-speed powder sieving device of the embodiment is suitable for semi-finished products of amino molding compounds after ball milling. The device comprises a powder sieving host 10, a motor 4, a frame 5, a fine powder discharging component 6, a coarse powder discharging component 7 and a bearing 8.

Still referring to fig. 1, the powder screening main machine 10 includes a main machine housing 1, a fixed screen 2, and a material guiding device 3, and the powder screening main machine 10 is provided with a material screw conveying passage. The frame 5 includes a motor bracket 51 and a powder sieving body bracket 52. The main machine housing 1 comprises a housing main body and a sealing cover 14 which are all made of stainless steel integrated pieces. The material guiding device 3 comprises a rotation shaft 31 and a helical blade 32.

Still referring to fig. 1, the powder screening main machine 10 and the motor 4 are both disposed on the frame 5, and the powder screening main machine 10 is fixedly disposed on the powder screening machine body bracket 52 by the housing main body of the main machine housing 1 thereof. The motor 4 is fixedly arranged on the motor bracket 51, and the motor 4 is fixedly connected with the left end of the rotating shaft 31 of the material guiding device 3 of the powder sieving host machine 10 through a coupler. The fixed screen 2 and the material guiding device 3 are both arranged in the main machine shell 1, and the fixed screen 2 is fixedly connected to the shell main body of the main machine shell 1. The material guide 3 is rotatably arranged relative to the housing body of the main housing 1 and in use the material guide 3 is driven by a motor 4.

Referring to fig. 1 and 2, the housing body of the main housing 1 includes a conveyor housing part 11, a screen housing part 12, and a fixed support base 13. The conveyor housing 11 and the screen housing 12 are disposed in a left-right direction and are connected to each other and communicate with each other in the left-right direction. The conveyor casing 11 includes a feed pipe 11-1 and a feed pipe 11-2. The screen housing 12 includes a left end plate.

Referring to fig. 3 and 4, the main body of the main body 1 of the main body is provided with a material inlet 11-1-1, a fine powder outlet 12-2 and a coarse powder outlet 12-3 in sequence from left to right, and the openings of the material inlet 11-1-1 are upward, and the openings of the fine powder outlet 12-2 and the coarse powder outlet 12-3 are downward. The right end of the conveyor casing part 11 of the casing body is inserted into the second circular through hole 12-1 of the powder sieving machine casing part 12 from the left side, and the periphery of the second circular through hole 12-1 is sealed and fixedly welded on the outer surface of the conveyor casing part 11. A fixed support 13 is provided in the screen housing 12 and fixedly attached to the left end plate of the screen housing 12 from the right. The sealing cover 14 is detachably and hermetically fixed at the right end opening of the screen shell 12.

Referring to fig. 5 and 6, the sieving machine casing part 12 of the main machine casing 1 is a horizontal cylindrical structural member, a circular through hole is provided in the left end plate of the sieving machine casing part 12, the circular through hole is used as a material conveying outlet 12-1 of the sieving machine 10, a large part of the left and right direction of the bottom of the sieving machine casing part 12 is provided with a through hole used as a fine powder outlet 12-2 of the main machine casing 1, and the right end part of the bottom of the sieving machine casing part 12 is provided with a through hole used as a coarse powder outlet 12-3 of the main machine casing 1. The axis of the circular through-hole of the left end plate of the screen housing 12 coincides with the central axis of the screen housing 12. The diameter of the circular through-hole of the left end plate of the screen housing 12 is about half the inner diameter of the screen housing 12.

Still referring to fig. 3 and 4, the conveying pipe 11-2 of the conveyor casing 11 is a cylindrical horizontal pipe body horizontally disposed in the left-right direction with a left end plate, the conveying pipe 11-2 has a right port 11-2-2, and a material inlet 11-2-1 is provided at the middle of the top portion in the left-right direction thereof. A circular through hole 11-2-3 is provided at the center of the left end plate of the delivery pipe 11-2, and the left end of the rotary shaft 31 protrudes leftward from the circular through hole 11-2-3. The feed pipe 11-1 is a cylindrical pipe body with both upper and lower ends open. The feeding pipe 11-1 is connected from the upper side to the material inlet 11-2-1 of the conveying pipe 11-2 from the lower end, and the feeding pipe 11-1 is communicated with the inner cavity of the conveying pipe 11-2. The upper port of the feeding pipe 11-1 is the material inlet 11-1-1 of the host shell 1. The conveyor casing 11 of the main body casing 1 is fixed on the left end plate of the screen casing 12 by the right port 11-2-2 of the conveyor pipe 11-2 thereof by airtight welding, and the right port of the conveyor pipe 11-2 is disposed around the circular through hole of the left end plate of the screen casing 12 through which the rotary shaft 31 passes, and the axis of which coincides with the axis of the conveyor pipe 11-2. The screw blade 32 is located in the conveying pipe 11-2 of the conveyor casing 11 and below the material inlet 11-2-1 of the conveying pipe 11-2.

Referring to fig. 5 and 6, the fixed support base 13 is a horizontal cylindrical stainless steel integrated piece, the central axis of the fixed support base 13 coincides with the central axis of the powder screening machine shell 12, and the fixed support base 13 is welded and fixed on the right side surface of the left end plate of the powder screening machine shell 12 by the left end thereof, and the fixed support base are in airtight and fixed connection.

Referring to fig. 1, 2, 5 and 6, the stationary screen 2 includes a screen frame 21 and a screen 22, and is provided with a coarse powder push-out port 21-2-1 located at a lower right end. The screen frame 21 is a stainless steel integrated piece and comprises a frame body 21-1, wherein the frame body 21-1 is in a circular frame shape, and 24 frame openings 21-1-7 are formed in the circumferential outer side of the frame body.

The screen 22 is fixedly provided on a circumferential outer side portion of the frame body 21-1 of the screen frame 21. The screen 22 is preferably an integral woven fiber net having high strength, and is fixedly provided on a circumferential outer side portion of the frame 21-1 of the screen frame 21, and covers all frame opening portions of the circumferential outer side of the frame 21-1 of the screen frame 21; or the screen 22 is divided into a plurality of stainless steel wires, each stainless steel wire is welded and fixed at a corresponding frame mouth position on the circumferential outer side of the frame body 21-1 of the screen frame 21; or the screen 22 is divided into a plurality of stainless steel punching nets, and each stainless steel punching net is welded and fixed at a corresponding frame opening part position on the circumferential outer side of the screen frame 21; or the screen 22 is a stainless steel punched net of whole sheet, welded and fixed to and covered on the circumferential outer side of the frame body 21-1 of the screen frame 21.

The fixed screen 2 is positioned in the screen shell 12 of the main machine shell 1, and the fixed screen 2 is fixedly connected to the fixed supporting seat 13 through the left port of the frame body 21-1 of the screen frame 21.

Referring to fig. 11 and 12, the screen frame 21 of the stationary screen 2 further includes a right baffle 21-2. The frame 21-1 includes 5 ferrules having the same diameter and overlapping axes, which are the first ferrule 21-1-1, the second ferrule 21-1-2, the third ferrule 21-1-3, the fourth ferrule 21-1-4, and the fifth ferrule 21-1-5, which are arranged in this order from left to right, and the axes of the ferrules, that is, the axis of the frame 21-1, are the central axes of the screen frame 21. The frame 21-1 further includes 6 connecting rib plates 21-1-6 arranged in the left-right direction. Each connecting rib plate 21-1-6 is fixedly connected with 5 ferrules which are sequentially arranged, and the connecting rib plates are equally arranged around the axis of the frame body 21-1 at 60 degrees, so that 24 corresponding frame openings 21-1-7 are formed between the adjacent ferrules and the adjacent connecting rib plates 21-1-6. The length-width ratio of the connecting rib plates 21-1-6 is 7:1, and the width of the connecting rib plates 21-1-6 is the same as the width of the second ferrule 21-1-2, the third ferrule 21-1-3 and the fourth ferrule 21-1-4. The right baffle 21-2 of the screen frame 21 is a circular plate, is fixed on the fifth ferrule 21-1-5 by seal welding, and is positioned on the right side of the fifth ferrule 21-1-5. The center of the right baffle 21-2 is located on the central axis of the screen frame 21, the lower part of the right baffle is provided with an arc-shaped opening, the arc-shaped opening is a coarse powder push-out port 21-2-1 of the screen 22, and the right outer side of the coarse powder push-out port 21-2-1 is located above the coarse powder outlet 12-3 of the host shell. The outer diameter of the right baffle 21-2 is larger than the outer diameter of the frame 21-1 and slightly smaller than the inner diameter of the screen shell 12 (less than 10 to 50 mm).

The stationary screen 2 further comprises a handle 23. The handle 23 is composed of a stainless steel tube 23-1 and a rubber sleeve 23-2, and the rubber sleeve 23-2 is fixedly sleeved at the right end of the stainless steel tube 23-1. The number of handles 23 in this embodiment is 3 in total. The 3 handles 23 are uniformly distributed on the right end face of the right baffle plate 21-2 and are fixed on the right end face of the right baffle plate 21-2 by welding the left end of the stainless steel tube 23-1.

Referring to fig. 13 and 14, the screen 22 is a rectangular high-strength synthetic fiber web, through-holes 22-1 of 80 mesh are uniformly formed in the surface of the synthetic fiber web, the length of the screen 22 is the same as the length of the frame 21-1 of the screen frame 21, and the width of the screen 22 is the same as the circumference of the side portion of the frame 21-1 of the screen frame 21.

Referring to fig. 2, the screen 22 is wound tightly around the circumferential outer side of the frame body 21-1 of the screen frame 21, the left end portion of the screen 22 is aligned with the left end portion of the first collar 21-1-1 of the screen frame 21, the right end portion of the screen 22 is aligned with the right end portion of the fifth collar 21-1-5 of the screen frame 21, and the screen 22 is not provided with mesh holes at positions corresponding to the second collar 21-1-2, the third collar 21-1-3, and the fourth collar 21-1-4 of the screen frame 21. The screen 22 and the screen frame 21 are bound and fixed by 4 cloth belts woven by high-strength synthetic fibers, and the 4 cloth belts are respectively positioned at positions corresponding to the second ferrule 21-1-2, the third ferrule 21-1-3 and the fourth ferrule 21-1-4 of the screen 22 and the screen frame 21. The cloth belts are respectively in close contact with the outer surface of the screen 22 and are respectively limited and fixed by grooves on the second ferrule 21-1-2, the third ferrule 21-1-3 and the fourth ferrule 21-1-4.

The screen frame 21 is tightly sleeved on the outer side wall of the fixed supporting seat 13 of the powder screening machine shell 12 through the first ferrule 21-1-1, namely, the fixed screen 2 is fixedly connected to the shell main body of the host shell 1 through the tight fit sleeve of the left port of the screen frame 21 and the fixed supporting seat 13.

Referring to fig. 7 and 7-1, the material guiding device 3 further includes a first bearing 30, a fixing bracket 33 and a guiding plate 34, and the materials of the rotating shaft 31, the helical blades 32, the fixing bracket 33 and the guiding plate 34 of the material guiding device 3 are all stainless steel, and the first bearing 30 is an oil-sealed bearing. The rotation shaft 31 is divided into a left end, a left section, and a right section in this order from left to right. The left end of the rotary shaft 31 protrudes leftward from the conveyor housing portion 11 of the main machine housing 1, the left section of the rotary shaft 31 is located in the conveyor housing portion 11 of the main machine housing 1, and the right section of the rotary shaft 31 is located in the screen housing portion 12. In response, the material guide 3 is divided into a drive section, a screw conveyor section 3a, and a centrifugal dispersing section 3b, which are connected to each other in the right-left direction.

The right end of the rotation shaft 31 is suspended, and the left end of the rotation shaft 31 is sequentially connected with the coupler and the bearing 8 from left to right, so that the left end of the rotation shaft 31 becomes a driving part of the rotation shaft 31. The bearing 8 is arranged on the frame 5 through a bearing seat and a corresponding connecting seat.

The first bearing 30 is connected to the left end of the rotary shaft 31 and is disposed at the left end of the conveyor casing 11 of the main casing 1. The screw blade 32 is fitted over the left section of the rotary shaft 31 and is positioned on the right side of the first bearing 30, so that the left section of the rotary shaft 31, the first bearing 30 and the screw blade 32 constitute the screw conveyor portion 3a of the material guiding device 3. And the screw blades 32 and the conveyor casing 11 form corresponding material screw conveying channels, namely, the material screw conveying channels of the powder sieving host machine 10.

The guide plates 34 are provided in 2 blocks and equally spaced 180 degrees apart around the axis of the rotary shaft 31. Each guide plate 34 is fixedly connected to the right section of the rotation shaft 31 through at least 2 fixing brackets 33 and is located above the fine powder outlet 12-2 of the main body casing 1, so that the right section of the rotation shaft 31, the fixing brackets 33 and the guide plates 34 constitute the centrifugal dispersing section 3b of the material guiding device 3. Each guide plate 34 and the fixed bracket 33 are located in the screen housing portion 12 of the main body casing 1, and the right section of the rotary shaft 31 and each guide plate 34 are disposed around by the fixed screen 2.

Referring to fig. 8 to 10, the guide plate 34 is a stainless steel integrated member, and is divided into a flat plate portion 34-1 and a guide portion 34-2 according to the distance from the axis of the rotary shaft 31, and the guide portion 34-2 is composed of a plurality of tooth plates 34-2-1, that is, the radially outer portion of the guide portion 34-2 is toothed. The tooth plates 34-2-1 are arranged in parallel with each other and have an included angle of 10 to 15 degrees with respect to the plane of the flat plate portion 34-1. The radially outer portion of the toothed plate 34-2-1 of the guide plate 34 is spaced from the circumferentially inner surface of the frame 21-1 by a distance of 5 to 10 mm. The flat plate portion 34-1 of the guide plate 34 is provided with 5 through bolt holes 34-1-1 having the same size, and the 5 bolt holes 34-1-1 are positioned on the same straight line and uniformly distributed in the left-right direction.

Referring to fig. 7 and 7-1, the fixing bracket 33 is a rectangular stainless steel plate, and has a through bolt hole formed in a radially outer middle portion thereof, and the size of the bolt hole corresponds to the through bolt hole 34-1-1 formed in the flat plate portion 34-1 of the guide plate 34. Each of the fixing brackets 33 is welded to the rotation shaft 31, and the fixing brackets 33 are divided into 2 groups (the number of groups of the fixing brackets 33 is the same as the number of blocks of the guide plate 34), 5 each. The respective fixing brackets 33 of each group are uniformly disposed on the rotation shaft 31 in the left-right direction, and the 2 groups of fixing brackets 33 are equally disposed on the rotation shaft 31 at 180-degree intervals from each other.

In other embodiments, the number of the guide plates 34 may be 4, and the number of the fixing frames 33 is 4 corresponding to the number of the guide plates 34 arranged at 90 degrees intervals, and the 4 fixing frames 33 are equally arranged at 90 degrees intervals according to each fixing frame 33 and welded and fixed on the rotating shaft 31.

Referring still to fig. 7 and 7-1, the bolt holes 34-1-1 of each guide plate 34 are in one-to-one correspondence with the bolt holes on the corresponding set of fixing brackets 33 located on the rotating shaft 31, and each guide plate 34 and the corresponding set of 5 fixing brackets 33 are fixedly connected by bolts passing through the bolt holes 34-1-1 of the guide plate 34 and the bolt holes on the fixing brackets 33. The left end of each guide plate 34 is located on the right side of the helical blade 32 and between the rotation shaft 31 and the fixed support 13.

Referring to fig. 1, the fine powder discharging assembly 6 includes a fine powder discharging hopper 61, a fine powder container bag 62, and a pallet 63. The fine powder discharging hopper 61 is a square-table-shaped stainless steel integrated piece with a large upper end opening and a small lower end opening, and is fixedly connected to the fine powder outlet 12-2 of the main machine shell 1 from below through an upper port of the stainless steel integrated piece, and the fine powder discharging hopper 61 is communicated with the inner cavity of the main machine shell 1. The fine powder container bag 62 may be filled with 300kg of the amino molding compound powder. The bottom of the pallet 63 is provided with 2 through sockets. In use, the top opening of the fine powder container bag 62 is tied up against the lower end opening of the fine powder discharge hopper 61, and the fine powder container bag 62 is placed on the upper surface of the pallet 23.

Still referring to fig. 1, the meal discharge portion 7 includes a meal discharge pipe 71, a meal flexible bag 72, and a backing plate 73. The coarse powder discharging pipe 71 is a circular tube stainless steel integrated piece and is fixedly connected to the coarse powder outlet 12-2 of the main machine shell 1 from the lower part through an upper port of the coarse powder discharging pipe 71, and the coarse powder discharging pipe 71 is communicated with the inner cavity of the main machine shell 1. The coarse powder container bag 72 can be filled with 300kg of amino molding compound powder. The bottom of the backing plate 73 is provided with 2 through sockets. In use, the top opening of the coarse powder holding bag 32 is secured to the lower end of the coarse powder discharge pipe 71 and the coarse powder holding bag 72 is placed on the upper surface of the backing plate 73.

Referring to fig. 1, the powder screening method of the high-speed powder screening device comprises the following steps: (1) the top opening of the fine powder container bag 62 is tied up to the lower end opening of the fine powder discharge hopper 61, and the top opening of the coarse powder container bag 72 is tied up to the lower port of the coarse powder discharge pipe 71.

(2) The motor 4 is started, the material guiding device 3 of the powder sieving host machine 10 is driven by the motor 4 to rotate, so that the rotating shaft 31 of the powder sieving host machine rotates at a rotating speed of 800-1200 revolutions per minute, and the spiral blades 32 simultaneously rotate at the same rotating speed under the drive of the rotating shaft 31 rotating at a high speed.

(3) The powder of the amino molding compound is put into a material inlet 11-1-1 of a main machine shell 1, and under the action of gravity, the powder enters a conveying pipe 11-2 after passing through a material inlet pipe 11-1 of the main machine shell 1 and falls onto a rotating spiral blade 32, and then enters a powder screening machine shell 12 after passing through a material spiral conveying channel of a powder screening main machine 10 from left to right under the driving of the spiral blade 32.

(4) With the high-speed rotation of the rotary shaft 31, the guide plate 34 rotates at the same high speed to generate centrifugal force, the powder entering the powder sieving machine shell 12 moves to the circumferential outside, after the powder collides with the screen 22, the fine powder in the powder is extruded through the screen holes 22-1 of the screen 22 with 75 to 85 meshes, and then flies to the inner wall of the host machine shell 1, the initial fine powder is stuck to the inner wall, after a certain amount of fine powder continuously flying to the inner wall is accumulated, part of the fine powder falls down into the fine powder discharging hopper 61, and finally falls into the fine powder container bag 62. The powder which impinges on the screen 22 is blocked on the inside of the screen 22 and moved from left to right by the pushing of the toothed plate 34-2-1 of the guide plate 34 until the powder is pushed out of the stationary screen 2 by the powder pushing port 21-2-1 of the screen frame 21 and falls down to the powder outlet 12-3 of the screen shell 12, into the powder discharge pipe 71 and finally into the powder container bag 72.

(5) When the fine powder container bag 62 is filled with fine powder, the fine powder container bag 62 filled with the fine powder is unwound from the fine powder discharge hopper 61 and set aside, and the empty fine powder container bag 62 is replaced. When the coarse powder container bag 72 is filled with coarse powder, the coarse powder container bag 72 filled with the coarse powder is unwound from the coarse powder discharge hopper 71 and set aside, and the empty coarse powder container bag 72 is replaced. The bag-filled fine powder flexible container 62 is sent to a finished product warehouse, and the bag-filled coarse powder flexible container 72 is sent to a ball milling workshop of the previous step for ball milling again.

Claims (10)

1. A high-speed powder sieving device comprises a frame (5), a fine powder discharging component (6) and a coarse powder discharging component (7); the powder sieving machine also comprises a powder sieving host machine (10) and a motor (4) which are fixedly arranged on the frame (5); the powder sieving host machine (10) comprises a host machine shell (1), wherein the host machine shell (1) comprises a shell main body, and the powder sieving host machine (10) is fixedly arranged on the frame (5) through the shell main body of the host machine shell (1); the main machine shell (1) is provided with a material inlet (11-1-1), a fine powder outlet (12-2) and a coarse powder outlet (12-3) in sequence from left to right on the main machine shell body, the openings of the material inlet (11-1-1) are upward, and the openings of the fine powder outlet (12-2) and the coarse powder outlet (12-3) are downward; the fine powder discharging component (6) is positioned below the fine powder outlet (12-2) of the main machine shell (1), and the coarse powder discharging component (7) is positioned below the coarse powder outlet (12-3) of the main machine shell (1); the method is characterized in that:

The powder sieving host machine (10) further comprises a fixed sieve (2) and a material guiding device (3), and the powder sieving host machine (10) is provided with a material spiral conveying channel; the main body of the main body casing (1) comprises a conveyor casing part (11) and a powder sieving casing part (12) which are mutually connected and communicated in the left-right direction; the material guiding device (3) comprises a screw conveying part (3 a) and a centrifugal dispersing part (3 b) which are mutually connected in the left-right direction; the material guiding device (3) is rotationally connected to the shell main body of the host shell (1), and the material guiding device (3) is driven by the motor (4) when in use; the spiral conveying part (3 a) and the centrifugal dispersing part (3 b) of the material guiding device (3) are respectively arranged in the conveyor shell part (11) and the powder screening machine shell part (12) of the main machine shell (1), a space formed between the spiral conveying part (3 a) and the conveyor shell part (11) is a material spiral conveying channel of the powder screening machine (10), the channel is communicated with the inner cavity of the powder screening machine shell part (12), and a material conveying outlet (12-1) of the channel is positioned at the right end of the channel; the fixed screen (2) is fixedly arranged on the shell main body of the host shell (1), is positioned in the inner cavity of the powder screening machine shell part (12), and is arranged around the centrifugal dispersing part (3 b) of the material guiding device (3); the fixed screen (2) comprises a screen (22) and a coarse powder pushing outlet (21-2-1) positioned at the lower part of the right end; the screen (22) is positioned above the fine powder outlet (12-2) of the main machine shell (1), and the right outer side of the coarse powder pushing-out port (21-2-1) of the fixed screen (2) is positioned above the coarse powder outlet (12-3) of the main machine shell (1).

2. The high-speed powder screening apparatus according to claim 1, wherein: the main body of the main machine shell (1) also comprises a fixed supporting seat (13); the conveyor shell (11) of the main machine shell (1) is fixedly connected to the left end plate of the powder screening machine shell (12) from the left side; the fixed supporting seat (13) is arranged in the powder screening machine shell (12) and is fixedly connected to the left end plate of the powder screening machine shell (12) from the right side;

the fixed screen (2) also comprises a screen frame (21) which is an integral piece; the screen frame (21) comprises a frame body (21-1); the frame body (21-1) is in a circular frame shape, and a plurality of frame openings (21-1-7) are arranged on the periphery and the outer side of the frame body; the fixed screen (2) is fixedly connected to the fixed supporting seat (13) through the left port of the frame body (21-1) of the screen frame (21);

the screen (22) is fixedly arranged on the circumferential outer side part of the frame body (21-1) of the screen frame (21); wherein the screen mesh (22) is an integral woven fiber net with high strength, is fixedly arranged on the circumferential outer side part of the frame body (21-1) of the screen frame (21), and covers all frame openings (21-1-7) on the circumferential outer side of the frame body (21-1) of the screen frame (21); or the screen (22) is divided into a plurality of stainless steel wires, and each stainless steel wire is welded and fixed at a corresponding frame opening (21-1-7) on the circumferential outer side of the frame body (21-1) of the screen frame (21); or the screen (22) is divided into a plurality of stainless steel punching nets, and each stainless steel punching net is welded and fixed at a corresponding frame opening (21-1-7) on the outer side of the periphery of the frame body (21-1) of the screen frame (21); or the screen (22) is a whole stainless steel punching net, and is welded and fixed on the circumferential outer side of the frame body (21-1) of the screen frame (21).

3. The high-speed powder screening apparatus according to claim 2, wherein: the frame body (21-1) of the screen frame (21) of the fixed screen (2) comprises 3 to 6 annular ferrules with the same diameter and 4 to 8 connecting rib plates (21-1-6); the ferrules are sequentially arranged in the order from left to right, and the axes of the ferrules are collinear; the axis is also the central axis of the screen frame (21); each connecting rib plate (21-1-6) is connected between adjacent ferrules and is equally arranged around the circumference, so that 2 adjacent connecting rib plates (21-1-6) and corresponding 2 adjacent ferrules surround a corresponding frame opening (21-1-7) on the circumference outside of the frame body (21-1); the leftmost ferrule sleeve of the frame body (21-1) of the screen frame (21) of the fixed screen (2) is the left port of the frame body (21-1);

the screen frame (21) of the fixed screen (2) also comprises a right baffle plate (21-2); the right baffle (21-2) is a circular plate, is fixed on one ferrule at the rightmost side in a sealing welding way, and is positioned at the right side of the ferrule; the center of the right baffle plate (21-2) is positioned on the central axis of the screen frame (21), and the lower part of the right baffle plate (21-2) is provided with an arch-shaped opening which is used as a coarse powder push-out opening (21-2-1) of the fixed screen (2).

4. A high-speed powder screening apparatus according to claim 3, characterized in that: the outer diameter of the right baffle plate (21-2) of the screen frame (21) of the fixed screen (2) is larger than the outer diameter of the frame body (21-1) and slightly smaller than the inner diameter of the screen shell (12).

5. The high-speed powder screening apparatus according to one of claims 2 to 4, characterized in that: also comprises a bearing (8); the material guiding device (3) comprises a rotating shaft (31); the rotary shaft (31) is sequentially divided into a left end head, a left section and a right section from left to right; the left end head of the rotating shaft (31) stretches out of the conveyor shell (11) of the main machine shell (1) leftwards, the left section of the rotating shaft (31) is positioned in the conveyor shell (11) of the main machine shell (1), and the right section of the rotating shaft (31) is positioned in the powder screening machine shell (12); the screw conveying part (3 a) of the material guiding device (3) comprises a left section of a rotating shaft (31), a first bearing (30) and a screw blade (32); the bearing (8) is positioned on the left side of the first bearing (30); the bearing (8) is connected to the left end of the rotating shaft (31), and the bearing (8) is arranged on the frame (5) through a bearing seat and a corresponding connecting seat; the first bearing (30) is connected to the left section of the rotating shaft (31) and is arranged at the left end part of the conveyor shell (11) of the host shell (1); the helical blade (32) is sleeved and fixed on the left section of the rotating shaft (31) and is positioned on the right side of the first bearing (30); a corresponding material spiral conveying channel, namely a material spiral conveying channel of the powder sieving host machine (10), is formed between the spiral blade (32) and the conveyor shell (11).

6. The high-speed powder screening apparatus according to claim 5, wherein: the centrifugal dispersing part (3 b) of the material guiding device (3) comprises a right section of the rotating shaft (31), a fixed bracket (33) and a guide plate (34); the guide plates (34) have 2 to 4 pieces, and the guide plates (34) are equally arranged in the circumferential direction around the right section of the rotary shaft (31); each guide plate (34) is fixedly connected to the right section of the rotary shaft (31) through at least 2 fixing brackets (33), and is arranged around the right section of the rotary shaft (31) and each guide plate (34) by a screen (22) of the fixed screen (2).

7. The high-speed powder screening apparatus according to claim 6, wherein: the guide plate (34) is an integral part and is divided into a flat plate part (34-1) and a guide part (34-2) according to the distance from the axis of the rotating shaft (31), wherein the guide part (34-2) consists of a plurality of toothed plates (34-2-1), namely, the radial outer part of the guide part (34-2) is toothed; the toothed plates (34-2-1) are arranged in parallel with each other and have an included angle of 10 to 15 degrees with respect to the plane of the flat plate portion (34-1).

8. The high-speed powder screening apparatus according to claim 6, wherein: the main body of the main machine shell (1) is an integral piece, and the conveyor shell (11) comprises a feed pipe (11-1) and a conveying pipe (11-2); the conveying pipe (11-2) is a cylindrical horizontal pipe body which is provided with a left end plate and horizontally arranged along the left-right direction, the conveying pipe (11-2) is provided with a right port (11-2-2), and a material inlet (11-2-1) is arranged in the middle of the top part of the conveying pipe along the left-right direction; a circular through hole (11-2-3) is arranged on the left end plate of the conveying pipe (11-2), and the left end head of the rotating shaft (31) extends leftwards from the circular through hole (11-2-3); the feeding pipe (11-1) is vertically arranged and is a cylindrical pipe body with openings at the upper end and the lower end; the feeding pipe (11-1) is connected to the part of the conveying pipe (11-2) provided with the material inlet (11-2-1) from the upper part through the lower port, and the feeding pipe (11-1) is communicated with the inner cavity of the conveying pipe (11-2); the upper port of the feed pipe (11-1) is a material inlet (11-1-1) of the host shell (1); the conveyor shell (11) of the main machine shell (1) is connected to the left end plate of the powder screening machine shell (12) through the right port (11-2-2) of the conveying pipe (11-2), the left end plate is provided with a circular through hole, the rotary shaft (31) passes through the circular through hole, and the circular through hole is used as a material conveying outlet (12-1) of the powder screening main machine (10); the helical blade (32) is positioned in the conveying pipe (11-2) of the conveyor shell (11) and below the material inlet (11-2-1) of the conveying pipe (11-2).

9. The high-speed powder screening apparatus according to claim 6, wherein: the fine powder discharging assembly (6) comprises a fine powder discharging hopper (61) and a fine powder container bag (62); the fine powder discharging hopper (61) is a square table shell-shaped integrated piece with a large upper end opening and a small lower end opening, and is fixedly connected to a fine powder outlet (12-2) of the host shell (1) from the lower part through an upper port of the fine powder discharging hopper; when in use, the top opening of the fine powder container bag (62) is tightly tied on the lower end opening of the fine powder discharging hopper (61); the coarse powder discharging assembly (7) comprises a coarse powder discharging pipe (71) and a coarse powder container bag (72); the coarse powder discharging pipe (71) is a circular pipe-shaped integrated piece; when in use, the top opening of the coarse powder container bag (72) is tightly tied on the bottom opening of the coarse powder discharging pipe (71); the host shell (1) also comprises a sealing cover (14); the sealing cover (14) is arranged at the right end opening of the powder sieving machine shell (12).

10. A powder screening method by a high-speed powder screening apparatus according to claims 1 to 9, characterized by the steps of:

(1) the top opening of the fine powder container bag (62) is tightly bound on the lower end opening of the fine powder discharging hopper (61), and the top opening of the coarse powder container bag (72) is tightly bound on the lower port of the coarse powder discharging pipe (71);

(2) Starting a motor (4), and driving a material guiding device (3) of a powder sieving host machine (10) to rotate by the motor (4) so that a rotating shaft (31) of the material guiding device rotates at a rotating speed of 800-1200 revolutions per minute, and simultaneously rotating a spiral blade (32) at the same rotating speed under the driving of the rotating shaft (31) rotating at a high speed;

(3) the powder of the amino molding compound is put into a material inlet (11-1-1) of a host shell (1), and under the action of gravity, the powder enters a conveying pipe (11-2) after passing through a feed pipe (11-1) of the host shell (1) and falls onto a rotating spiral blade (32), and then enters a powder screening machine shell (12) after passing through a material spiral conveying channel of a powder screening host (10) from left to right under the driving of the spiral blade (32);

(4) along with the high-speed rotation of the rotating shaft (31), the guide plate (34) rotates at the same high speed to generate centrifugal force, the centrifugal force enables the powder entering the powder screening machine shell (12) to move outwards in the circumferential direction, after the powder impacts on the screen (22), the fine powder in the powder is extruded through the screen holes (22-1) of the screen (22) with 75 to 85 meshes, and then flies to the inner wall of the host shell (1), the initial fine powder is stuck to the inner wall, after a certain amount of fine powder continuously flying to the inner wall is accumulated, part of the fine powder falls into the fine powder outlet hopper (61) and finally falls into the fine powder collecting bag (62); powder impinging on the screen (22) is blocked on the inner side of the screen (22) and moves from left to right under the pushing of the toothed plate (34-2-1) of the guide plate (34) until the coarse powder is pushed out of the fixed screen (2) by the coarse powder pushing-out port (21-2-1) of the screen frame (21), falls to the coarse powder outlet (12-3) of the screen shell (12) immediately, falls into the coarse powder discharging pipe (71) and finally falls into the coarse powder container bag (72);

(5) When the fine powder container bag (62) is full of fine powder, the fine powder container bag (62) filled with the fine powder is unwound from the fine powder discharge hopper (61) and placed aside, and then the empty fine powder container bag (62) is replaced; when the coarse powder container bag (72) is full of coarse powder, the coarse powder container bag (72) filled with the coarse powder is unwound from the coarse powder discharging pipe (71) and put aside, and then the empty coarse powder container bag (72) is replaced; and (3) conveying the fine powder flexible container (62) filled with the bags to a finished product warehouse, and conveying the coarse powder flexible container (72) filled with the bags to a ball milling workshop of the previous step for ball milling again.