CN107790235B

CN107790235B - Ball mill and powder discharging method suitable for preparing amino molding compound granules

Info

Publication number: CN107790235B
Application number: CN201710971398.7A
Authority: CN
Inventors: 陈瑞福; 秦光熙; 陆平; 陈何
Original assignee: Liyang Josen Plastic Co ltd
Current assignee: Liyang Josen Plastic Co ltd
Priority date: 2017-10-18
Filing date: 2017-10-18
Publication date: 2023-05-30
Anticipated expiration: 2037-10-18
Also published as: CN107790235A

Abstract

The invention relates to a ball mill and a powder discharging method which are suitable for being used in preparing amino molding compound granules. The ball mill comprises a ball mill body, a ball mill swinging powder outlet passage fixedly connected with the ball mill body during powder outlet, and a powder inlet pipe orifice arranged at a certain distance from the ball mill swinging powder outlet passage; the powder inlet pipe orifice is communicated with the inner cavity of the storage device positioned below the powder inlet pipe orifice. When powder is discharged, the upper port of the inner layer cloth cylinder is bound on the ball milling swing powder discharge passage, the inner layer cloth cylinder downwards passes through the powder inlet pipe orifice, and the lower port of the inner layer cloth cylinder is positioned in the storage device; and then starting a motor regulated and controlled by a PLC, and adjusting the movement mode of the ball mill body to make slow reciprocating swing around a rotating shaft, wherein the powder subjected to ball milling falls into a storage device arranged below the ball mill through an inner-layer cloth cylinder. When the ball mill is used, the dust flying can be effectively restrained, and the noise is low. Not only the powder discharge rate is higher, but also the productivity is improved, the electric energy is saved, and the cleanliness of the product is better maintained.

Description

Ball mill and powder discharging method suitable for preparing amino molding compound granules

Technical Field

The invention relates to a ball mill and a powder discharging method thereof, in particular to a ball mill and a powder discharging method suitable for being used in preparing amino molding compound granules.

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 for replacing the vacuum mixing step compared with the one-step process, and a drying step adopting special drying equipment is added after the vacuum kneading step, rather than the method of directly adopting a vacuumizing method in the vacuum mixing equipment to remove water as in 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. The discharging method of the ball mill used in the conventional preparation of the amino molding compound granules is that the ball mill body rotates for 360 degrees and discharges materials, and the structure and the discharging mode are too fast, so that a large amount of dust is easy to generate, the material is wasted, and even hidden danger is brought to the health of workers. In addition, when the materials in the ball mill are about to be discharged, the ball mill still runs continuously according to 360 degrees, and because the materials in the ball mill are less, steel balls or porcelain balls (commonly called grinding balls) fall to one side to easily generate loud sounds, so that noise pollution is caused.

Chinese patent document CN202238187U (patent application No. 201120381501.0) discloses a ball mill. The ball mill comprises a barrel-shaped machine body, a supporting frame connected with the machine body, a feed inlet arranged on the upper part of the machine body and a discharge outlet arranged on the lower part of the machine body, wherein the machine body is connected with the supporting frame through a rotating shaft. The ball mill also comprises elastic anti-offset devices which are arranged on the rotating shafts on two sides of the mill body and are positioned between the mill body and the supporting frame, thereby effectively avoiding inertial movement caused by eccentric mechanical action of the mill body in the production process. The anti-migration device has a non-integrally closed open loop configuration and is in the form of an incomplete cylinder with a slit in the wall. The ball mill with the structure avoids excessive shearing friction between the rotating shaft and the supporting frame, prolongs the service life of the rotating shaft of the ball mill, but still does not solve the problems of dust overflow and high noise.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a ball mill and a powder discharging method which can effectively prevent dust from flying during powder discharging and have low noise and are suitable for being used in preparing amino molding compound granules.

The technical scheme for realizing the purpose of the invention is as follows: the ball mill comprises a mill body, a motor rack and a mill rack; the ball mill body is provided with a material port; the ball mill body is arranged on the ball mill frame through a rotating shaft and a corresponding bearing and a bearing seat; the motor is arranged on the motor frame and is connected with the rotating shaft through a corresponding speed reducing mechanism; the structure is characterized in that: the device also comprises a powder outlet fence device, a powder outlet connecting device, an inner layer cloth cylinder and a powder inlet pipe orifice assembly; the powder inlet pipe orifice assembly comprises a powder inlet pipe orifice; the powder inlet pipe orifice is fixedly arranged at the feed inlet of the storage device for storing powder or is the feed inlet of the storage device, the upper port of the powder inlet pipe orifice extends upwards, and the powder inlet pipe orifice is communicated with the inner cavity of the storage device positioned below the powder inlet pipe orifice; the motor is a variable-frequency speed-regulating motor.

When powder is discharged, the powder discharging fence device is detachably and fixedly connected to the ball mill body and is positioned at the material port, and the powder discharging connecting device is detachably and fixedly connected to the powder discharging fence device and is communicated with the inner cavity of the ball mill body through the powder discharging fence device, so that the ball mill body, the part positioned at the material port, the powder discharging fence device and the powder discharging connecting device form a ball milling swinging powder discharging passage; the powder inlet pipe orifice of the powder inlet pipe orifice assembly is separated from the powder outlet connecting device by a certain distance; the upper port of the inner cloth cylinder is bundled and sleeved on the ball milling swing powder outlet passage, the inner cloth cylinder downwards passes through the powder inlet pipe orifice, and the lower port of the inner cloth cylinder is positioned in the storage device.

The ball mill also comprises an outer cloth cylinder. When powder is discharged, the outer cloth cylinder is sleeved outside the inner cloth cylinder, the upper port of the outer cloth cylinder is bundled and sleeved on the ball milling swinging powder discharging passage, and the lower port of the outer cloth cylinder is bundled and sleeved on the powder inlet pipe orifice.

The ball mill body also comprises a ball mill shell and a material port flange; the ball mill shell is a cylinder body which is horizontally arranged, namely the axis of the ball mill shell is horizontally arranged along the left and right directions, and the ball mill shell is provided with a material port, namely the material port of the ball mill body; the material port is positioned at the middle position of the bottom of the ball mill shell; the material port flange is in airtight and fixed connection with the shell of the ball mill and is positioned at the bottom of the material port.

The powder outlet fence device comprises a fence cover, column bars, a connecting seat and a stainless steel wire net; the fence cover and the connecting seat are all integrated; the fence cover has a central opening; the plurality of column bars are fixedly arranged on the fence cover along the front-back direction and are positioned at the central opening part of the fence cover; the connecting seat comprises a net frame part and 2 connecting parts which are arranged left and right; the screen frame part is positioned at the center and is provided with a central opening; the connecting seat is positioned below the fence cover, and is contacted and fixedly connected with the fence cover through the connecting part of the connecting seat; the stainless steel wire net is horizontally arranged, welded and fixed on the net frame part of the connecting seat and positioned at the central opening of the net frame part.

The powder outlet fence device is detachably and fixedly connected with the ball mill body, and the connecting seat and the fence cover are detachably and fixedly connected with the material port flange through fasteners.

The fence cover of the powder outlet fence device of the ball mill comprises a fence frame part and a square-shaped frame plate part; the fence frame part is a rectangular frame body and consists of a front frame, a rear frame, a left frame and a right frame which are vertically arranged, wherein the space part surrounded by the rectangular frame body is the central opening part of the fence cover; the front and rear frames of the fence frame part are relatively and uniformly provided with through holes with the same size and the same number of column bars, the axes of the through holes are arranged along the front and rear directions, and each through hole of the front frame corresponds to a corresponding through hole of the rear frame to form a corresponding group of through holes; the back-shaped frame plate part of the fence cover is positioned at the periphery of the fence frame part and at the bottom of the fence frame part, and the thickness of the plate body of the back-shaped frame plate part is the same as that of the plate body of the fence frame part.

The fence cover of the powder outlet fence device of the ball mill also comprises a baffle plate part; the baffle plate part comprises a front baffle plate and a rear baffle plate which are rectangular and have the same size; the upper end of the front baffle is connected with the front end of the rectangular frame plate part; the upper end of the rear baffle is connected with the rear end of the rectangular frame plate part; the thickness of the front baffle and the back baffle is the same as that of the plate body of the rectangular frame plate.

The height of the connecting part of the connecting seat of the powder discharging connecting device of the ball mill is larger than that of the net frame part, and the upper surfaces of the connecting seat and the net frame part are flush; the powder discharging connecting device is an integrated piece and comprises a supporting part, a connecting part, a strip-shaped boss part and a limiting part; the supporting part is of a rectangular cylindrical structure, a square hole in the center, namely a material channel, and the peripheral dimension of the supporting part corresponds to the peripheral dimension of the net frame part of the connecting seat; the number of the connecting parts is 2, and the connecting parts are connected to the supporting parts from the left side and the right side; the strip-shaped boss parts are 2 and are connected to the top of the supporting part from the upper part to the lower part; the strip-shaped boss parts are rectangular strip-shaped bodies extending along the front-back direction, and the distance between the inner side walls of the 2 strip-shaped boss parts is larger than the length of the stainless steel wire mesh; the distance between the outer side walls of the 2 strip-shaped boss parts corresponds to the distance between the inner sides of the 2 connecting parts of the connecting seat; the limiting part is a square annular boss limiting part and is arranged at the lower end part of the supporting part and protrudes outwards in the radial direction.

The material port flanges of the ball mill shell of the ball mill are respectively provided with connecting openings facing the outer sides of the left side and the right side at 4 corners; the fence cover is also provided with connecting openings facing the outer sides of the left side and the right side at 4 corners of the rectangular frame plate part; the 2 connecting parts of the connecting seat are respectively provided with a corresponding connecting notch facing to the outer sides of the left side and the right side at the front part and the rear part of each connecting part; the 2 connecting parts of the powder discharging connecting device are respectively provided with a corresponding connecting opening facing to the left and right outer sides at the front part and the rear part of each connecting part.

When powder is discharged, each connecting notch on the material port flange is aligned with a corresponding connecting notch of the fence cover, a corresponding connecting notch of the connecting seat and a corresponding connecting notch of the powder discharging connecting device one by one in sequence from top to bottom, the corresponding 4 screws serving as fasteners are embedded into the corresponding connecting notch aligned in the same group inwards at the left and right sides, and then the 4 nuts serving as fasteners are screwed and screwed on the corresponding one screw, so that the material port flange, the fence cover, the connecting seat and the powder discharging connecting device are connected with one another in a detachable and fixed mode.

The powder inlet pipe orifice component of the ball mill comprises a powder inlet pipe orifice; the powder inlet pipe orifice is an integral part and is positioned right below the bottom of the powder outlet connecting device of the ball mill during powder outlet; the bottom of the powder inlet pipe orifice is fixed on the powder inlet port part of the storage device, and the top of the powder inlet pipe orifice is provided with a second limiting part; the second limiting part is a flanging part facing to the outer side of the upper end of the powder inlet pipe orifice; the lower port of the powder inlet pipe opening faces downwards and is communicated with the inner cavity of the storage device.

The ball mill also comprises a baffle frame; the powder inlet pipe orifice assembly also comprises a cloth cylinder baffle and a connecting plate; the connecting plate is fixedly connected to the powder inlet pipe orifice and is horizontally arranged; the number of the cloth cylinder baffles is 2, and the cloth cylinder baffles are arranged at the front side and the rear side of the powder inlet pipe orifice according to the difference of front and rear positions; each arc cloth cylinder baffle is fixedly arranged through a corresponding baffle frame fixed on the foundation; one end of each arc-shaped cloth cylinder baffle close to the powder inlet pipe orifice is fixedly connected with the connecting plate.

The invention provides a powder discharging method of a ball mill, which comprises the following steps:

(1) after ball milling is finished according to normal 360-degree rotation, the ball mill cover covering the material port is removed from the material port flange, and then the ball mill body is rotated to a position where the material port flange faces downwards.

(2) The bolts connected with the nuts are placed at the connection openings of the material port flange, and then the fence cover of the powder discharging fence device, the connecting seat of the powder discharging fence device and the connecting part of the powder discharging connecting device are sleeved on a corresponding screw rod through the respective connection openings according to the sequence from top to bottom, so that the material port flange, the fence cover of the powder discharging fence device, the connecting seat of the powder discharging fence device and the powder discharging connecting device are detachably and fixedly connected together according to the sequence from top to bottom.

(3) The inner cloth cylinder is arranged in the outer cloth cylinder, the upper port of the inner cloth cylinder is bound on the limiting part of the powder discharging connecting device, and the middle lower part of the inner cloth cylinder and the lower port extend into the storage device.

(4) The upper port of the outer layer cloth cylinder is also tied up on the limit part of the powder outlet connecting device, and the lower port of the outer layer cloth cylinder is tied up on the powder inlet pipe orifice.

(5) And starting a motor regulated and controlled by the programmable logic controller, enabling the ball mill body to rotate around the rotating shaft by an angle not exceeding 90 degrees sequentially through the motor shaft, the coupler, the pinion and the large gear, and then enabling the ball mill body to reversely rotate.

(6) When the ball mill body rotates until the powder outlet fence device is positioned right below the ball mill body, the movement mode of the ball mill body is regulated by a PLC control program to do slow reciprocating swing around the rotating shaft; the swinging angle of the ball mill body is 180-240 degrees.

(7) Powder in the ball mill body falls into a storage device arranged below the ball mill through an inner layer cloth cylinder successively in the swinging process, and the powder discharge is finished after the powder swings to a set time.

In the powder discharging method of the ball mill, the specific swinging mode of reciprocating swinging in the step (6) is as follows: the first stage is to stop 2+ -0.5 min after swinging twice at 2+ -0.5 rpm/min; the second stage is stopped for 2+/-0.5 min after swinging for two times at the rotating speed of 4+/-0.5 rpm/min; and in the third stage, swinging at the rotating speed of 4+/-0.5 rpm/min until the powder discharging is finished.

The invention has the positive effects that: (1) As the ball mill body of the ball mill adopts a swinging type operation mode when the ball mill discharges powder, the ceramic balls roll or slide (preferably 210 degrees) only within the angle range of not more than 180-240 degrees, thereby greatly reducing noise pollution. (2) When the ball mill is used for discharging powder, related parts forming a ball milling swing channel are detachably arranged, and then an inner layer cloth cylinder with enough length is arranged on the ball milling swing channel and downwards passes through a powder inlet pipeline and stretches into a storage device, so that when the ball mill is used for discharging powder, powder sequentially passes through a material port flange, a powder discharging fence device and a powder discharging connecting device and enters the inner layer cloth cylinder, then downwards passes through the powder inlet pipeline and enters the storage device. Wherein, the falling off of the ball-milling lining ceramic chip or broken fragments thereof can be blocked at the powder outlet fence device. (3) When discharging, powder enters the storage device through the powder discharging connecting device, and a very small part of the powder can escape from a gap between the inner cloth cylinder and the powder inlet pipeline, but the invention preferably adopts a mode of arranging the outer cloth cylinder between the ball milling swinging channel and the powder inlet pipeline, so that the escape of the powder can be effectively isolated, the flying of the powder is effectively restrained, the pollution of the powder is greatly reduced, and the working environment is effectively improved. Of course, such dust escaping from the gap between the inner cloth cylinder and the powder inlet pipe can also be dust-protected in other ways. (4) In order to prevent the inner cloth cylinder from being brought out of the powder inlet pipeline in the swinging process, and the parts of the inner cloth cylinder can not smoothly fall back when swinging back, a weight can be arranged at the lower end of the inner cloth cylinder, so that the inner cloth cylinder is always in a tight state, and can smoothly fall back. (5) The ball mill provided by the invention has relatively balanced powder discharge, high powder discharge rate of the fine powder, and high yield of fine powder passing through a 80-mesh sieve, and can reach about 93%. (6) The invention is provided with the programmable logic controller, and the motor adopts the variable frequency speed regulating motor, so that the swinging motion of the ball mill body can be automatically controlled to run in a mode of firstly slowing down and then stopping for 2 to 5 times, and the control mode is more reliable and efficient than manual control. (7) Compared with the prior art, the invention can save time by about 37.5%, not only effectively improve productivity and save electric energy, but also is more beneficial to keeping good cleanliness of products.

Drawings

FIG. 1 is a schematic view of a ball mill suitable for use in preparing amino molding compound pellets of the present invention, the ball mill shown in the powder-out state.

Fig. 2 is a right-side view of fig. 1.

Fig. 3 is a schematic cross-sectional view of the ball-milling swing powder discharge passage of fig. 1, the cross-sectional direction being the A-A direction of fig. 4.

Fig. 4 is a schematic top view of the powder discharge fence device and the powder discharge connection device in fig. 3.

Fig. 5 is a schematic view of a cap and column of the powder discharge barrier assembly of fig. 3.

Fig. 6 is a schematic top view of the barrier cover of fig. 5.

Fig. 7 is a schematic view of the connection block and stainless steel wire mesh of fig. 3.

Fig. 8 is a schematic top view of fig. 7.

Fig. 9 is a schematic view of the powder discharge connection device in fig. 3.

Fig. 10 is a schematic top view of fig. 9.

FIG. 11 is an enlarged partial schematic view of the inlet nozzle assembly of FIG. 2.

Fig. 12 is a schematic cross-sectional view of another structure of the powder discharge connection device of the present invention, the cross-sectional direction being the B-B direction of fig. 13.

Fig. 13 is a schematic top view of fig. 12.

The labels in the above figures are as follows:

ball mill body 1, ball mill shell 10, material mouth 10-1, rotation axis 11, bearing 12, material mouth flange 13, powder outlet fence device 2, fence cover 21, fence frame 21-1, square frame 21-2, connection gap 21-2-1, baffle 21-3, column 22, connection seat 23, net frame 23-1, connection portion 23-2, connection gap 23-3, stainless steel wire mesh 24, powder outlet connection device 3, support portion 31, connection portion 32, connection gap 32-1, strip boss portion 33, limit portion 34, powder outlet connector 35, stainless steel liner 36, outer cloth tube 41, inner cloth tube 42, powder inlet tube assembly 5, powder inlet tube opening 51, second limit portion 52, cloth tube baffle 53, connection plate 54, material storage device 6, motor 71, motor frame 72, ball mill frame 73, baffle frame 74, pinion 75, and large gear 76.

Detailed Description

In the following description, the orientation shown in fig. 1 is taken as the description orientation, that is, the up-down-left-right direction shown in fig. 1 is the up-down-left-right direction in the description, the orientation of the paper facing forward is the front, and the orientation of the paper facing away from the paper is the rear.

Example 1

Referring to fig. 1 and 2, the ball mill suitable for use in preparing the amino molding compound pellets of the present embodiment includes a ball mill body 1, a powder discharge fence device 2, a powder discharge connection device 3, an outer cloth cylinder 41, an inner cloth cylinder 42, a powder inlet pipe orifice assembly 5, a motor 71, a motor frame 72, a ball mill frame 73, and a baffle plate frame 74. The ball mill body 1 is provided with a material port 10-1. The motor frame 72, the ball mill frame 73 and the baffle frame 74 are all fixedly arranged on the foundation.

Referring to fig. 1, a ball mill body 1 is provided on a ball mill frame 73 through its rotation shaft 11 and corresponding bearings and bearing seats. The motor 71 is a variable frequency speed motor, which is disposed on the motor frame 72 and is connected to the rotary shaft 11 located on the left side by its motor shaft through a corresponding reduction mechanism.

Still referring to FIG. 1, the powder inlet nozzle assembly 5 includes a powder inlet nozzle 51. The powder inlet pipe orifice 51 is fixedly arranged at the feed inlet of the storage device for storing powder or is the feed inlet of the storage device, the upper port of the powder inlet pipe orifice 51 extends upwards, and the powder inlet pipe orifice 51 is communicated with the inner cavity of the storage device positioned below the powder inlet pipe orifice.

Still referring to fig. 1, during powder discharge, the powder discharge fence device 2 is positioned below the material port 10-1 of the ball mill body 1 and is detachably and fixedly connected to the ball mill body 1. The powder discharging connecting device 3 is positioned below the powder discharging fence device 2, is detachably and fixedly connected to the powder discharging fence device 2 and is communicated with the inner cavity of the ball mill body 1 through the powder discharging fence device 2, so that the ball mill body 1 is positioned at the material port 10-1, and the powder discharging fence device 2 and the powder discharging connecting device 3 form a ball mill swinging powder discharging passage.

Still referring to fig. 1, when the powder inlet nozzle 51 of the powder inlet nozzle assembly 5 is aligned with the powder outlet connection means 3 in the up-down direction, the two are spaced apart from each other by a distance of 5 to 10 cm. The outer cloth tube 41 is sleeved outside the inner cloth tube 42. The upper port of the inner cloth cylinder 42 is bundled and sleeved at the lower part of the powder outlet connecting device 3, the inner cloth cylinder 42 passes through the powder inlet pipe orifice 51 downwards, and the lower port of the inner cloth cylinder 42 is arranged in the inner cavity of the storage device 6 positioned at the lower part of the ball mill. The outer cloth cylinder 41 is connected between the powder outlet connecting device 3 and the powder inlet pipe orifice 51.

Still referring to fig. 1, the ball mill body 1 includes a ball mill housing 10, a

material port flange

13, 2

rotation shafts

11, and 2 bearings 12. The ball mill shell 10 is a steel cylinder which is horizontally arranged, namely, the axis of the steel cylinder is horizontally arranged along the left-right direction, and the ball mill shell 10 is provided with a material port, namely, the material port 10-1 of the ball mill body 1. The material port 10-1 is located at the middle position of the bottom of the ball mill housing 10. The material port flange 13 is made of stainless steel, is fixed on the ball mill outside 10 in a sealing welding way, and is positioned at the bottom of the material port 10-1. The material port flange 13 is provided with 4 connecting openings.

Still referring to fig. 1, the 2 rotating shafts 11 are respectively located at the center positions of the left and right end portions of the ball mill housing 10, and are fixedly connected with the corresponding one of the left and right end portions of the ball mill housing 10. The 2 bearings 12 are respectively sleeved on the corresponding 1 rotating shafts 11 in a left-right manner, and are fixedly arranged on the ball mill frame 73 in a left-right manner through corresponding bearing blocks. The reduction mechanism connected to the motor shaft of the motor 71 is a pair of gears. They are a large gear 76 and a small gear 75. The rotary shaft 11 at the left end of the ball mill housing 10 is fixedly connected with a large gear 76, the large gear 76 is meshed with a small gear 75 positioned below, and the small gear 75 is fixedly connected with a motor shaft of the motor 71 through a coupler. The motor 71 is fixedly mounted on a motor housing 72.

Referring to fig. 3 and 4, the powder discharge fence device 2 includes a fence cover 21, a column 22, a connection base 23, and a stainless steel wire net 24. The fence cover 21 and the connecting seat 23 are all integrated. The barrier cover 21 has a central opening. The columns 22 are 16 and parallel to each other. Each column 22 is fixedly provided on the barrier cover 21 in the front-rear direction and is located at the central opening portion of the barrier cover 21. The connecting seat 23 comprises a net frame part 23-1 and a connecting part 23-2, wherein the net frame part 23-1 is positioned at the center and provided with a central opening; the connecting portions 23-2 are located on the left and right sides of the central portion 23-1. The connecting seat 23 is located below the barrier cover 21, and is contacted and fixedly connected with the barrier cover 21 by the connecting portion 23-2 thereof. The stainless steel wire mesh 24 is horizontally arranged, welded and fixed on the mesh frame part 23-1 of the connecting seat 23, and is positioned at the central opening of the mesh frame part 23-1. The mesh size of the stainless steel mesh 24 was 10.

Referring to fig. 5 and 6, the fence cover 21 of the powder discharge fence device 2 is an integral piece formed by stamping stainless steel plates, and comprises a fence frame portion 21-1, a rectangular frame plate portion 21-2 and a baffle plate portion 21-3. The fence frame 21-1 is a rectangular frame body, and is composed of front, rear, left and right side frames vertically provided in a plate shape, and a space portion surrounded by the rectangular frame body is a central opening portion of the fence cover 21. The front and rear frames of the fence frame portion 21-1 are long, 16 through holes of the same size are relatively and uniformly formed in the front and rear frames, the axes of the through holes are all arranged in the front and rear direction, each through hole of the front frame corresponds to a corresponding through hole of the rear frame to form a corresponding group of through holes, and the axes of the through holes corresponding to the front and rear frames are on the same straight line. The distance between the adjacent through holes of the front frame and the rear frame is the same as the radius of the through hole.

Referring still to fig. 5 and 6, the rectangular frame plate 21-2 of the barrier cover 21 is located around the barrier frame 21-1 and at the bottom of the barrier frame 21-1, and the thickness of the rectangular frame plate 21-2 is the same as the thickness of the rectangular frame plate 21-1; four corners of the plate body of the rectangular frame plate part 21-2 are respectively provided with a mounting notch 21-2-1. Each of the mounting notches 21-2-1 corresponds to a corresponding one of the material port flanges 13 provided at the bottom of the material port 10-1 of the ball mill body 1.

Still referring to fig. 5 and 6, the barrier portion 21-3 of the barrier cover 21 includes front and rear barriers each having a rectangular shape and the same size. The upper end of the front baffle is connected with the front end of the rectangular frame plate part 21-2. The upper end of the tailgate is connected to the rear end of the rectangular frame plate portion 21-2. The thickness of the front and rear baffles is the same as that of the plate body of the rectangular frame plate 21-2.

Still referring to fig. 5 and 6, the column 22 is a cylindrical stainless steel unitary piece. Each of the aforementioned column 22 is fixedly disposed on the barrier cover 21 along the front-rear direction and located at the central opening of the barrier cover 21, which means that each column 22 is fixedly disposed on the barrier frame 21-1 of the barrier cover 21, and the front-rear ends thereof are fixedly disposed in a corresponding set of through holes of the barrier frame 21-1. The cross-sectional dimension of the columnar bar 22 corresponds to the size of the through hole, and the length of the columnar bar 22 corresponds to the front-rear distance of the fence frame portion 21-1.

Referring to fig. 7 and 8, the connecting base 23 of the powder-discharging fence device 2 is an integrally cast piece made of stainless steel, and 2 connecting portions 23-2 of the connecting base 23 are arranged on the left and right sides of the net frame portion 23-1. The 2 connecting parts 23-2 are equally divided and provided with 2 connecting openings 23-3 before and after. The height of the connecting part 23-2 is 5 times that of the net frame part 23-1, and the upper surfaces of the connecting part and the net frame part are flush. The peripheral dimension of the frame portion 23-1 of the connection seat 23 corresponds to the peripheral dimension of the fence frame portion 21-1, and the peripheral dimension of the stainless steel wire mesh 24 corresponds to the peripheral dimension of the fence frame portion 21-1.

Referring to fig. 9 and 10, the powder discharge connection device 3 is an integrally cast member made of stainless steel, and includes a supporting portion 31, a connection portion 32, a bar-shaped boss portion 33, and a limiting portion 34. The supporting portion 31 is a rectangular cylindrical structure, and has a central square hole, i.e., a material passage, and a peripheral dimension corresponding to a peripheral dimension of the frame portion 23-1 of the connecting seat 23. The number of the connecting parts 32 is 2, the connecting parts are connected on the supporting part 31 from the left side and the right side, 2 connecting openings 32-1 are respectively arranged at the front part and the rear part of the connecting parts, and each of the 4 openings corresponds to a corresponding one of the connecting openings 23-3 of the connecting seat 23. The number of the bar-shaped boss portions 33 is 2, and is connected to the top of the supporting portion 31 from above and from left to right. The bar-shaped boss portions 33 are rectangular bar-shaped bodies extending in the front-rear direction, and the distance between the inner side walls of the 2 bar-shaped boss portions 33 is greater than the length of the stainless steel wire mesh 24. The distance between the outer side walls of the 2 bar-shaped boss portions 33 corresponds to the distance between the inner sides of the 2 connecting portions 23-2 of the connecting seat 23. The limiting part 34 is a square annular boss limiting part, is arranged at the lower end of the supporting part 31, and protrudes radially outwards.

Referring to fig. 3 and 4, the connection notch 32-1 of the connection portion 32 of the powder discharge connection device 3 is aligned with the mounting notch 21-2-1 of the rectangular frame plate portion 21-2 of the upper barrier cover 21 and the connection notch on the material port flange 13 of the ball mill housing 10 above the barrier cover 21 from bottom to top, the corresponding 4 screws as fasteners are embedded into the corresponding connection notch aligned in the same group, and the 4 nuts as fasteners are screwed and screwed on the corresponding one screw, so that the powder discharge connection device 3, the barrier cover 21 and the material port flange 13 are fixedly connected with each other.

Referring to fig. 1 and 2, the outer cloth tube 41 and the inner cloth tube 42 are both woven from high-strength wear-resistant synthetic fibers and are open-ended fabrics. Is basically cylindrical in the case of being used in a stretching way. The opening diameter of the outer cloth cylinder 41 is larger than that of the inner cloth cylinder 42, and the opening diameters of the outer cloth cylinder 41 are both larger than the maximum size of the outer diameter of the powder inlet pipe orifice 51 and the outer periphery of the limit part 34 of the powder outlet connecting device 3. The opening diameter of the inner cloth cylinder 42 is larger than the maximum size of the stopper 34, but not larger than the inner diameter of the powder inlet pipe orifice 51. The length of the outer cloth cylinder 41 and the inner cloth cylinder 42 is 0.8 times of the circumference of the outer side wall of the ball mill body 1.

Referring to fig. 1 and 2, the powder inlet nozzle 51 of the powder inlet nozzle assembly 5 is a stainless steel integrated piece and is located right below the bottom of the powder outlet connecting device 3. The bottom of the powder inlet pipe orifice 51 is fixed on the powder inlet port of the storage device 6, the top of the powder inlet pipe orifice is provided with a second limiting part 52, and the second limiting part 52 is a flanging part facing the outer side of the upper end of the powder inlet pipe orifice 51. The lower port of the powder inlet pipe orifice 51 is communicated with the inner cavity of the storage device 6 arranged below the ground.

Referring to fig. 2 and 11, the powder inlet nozzle assembly 5 further includes a cloth cylinder baffle 53 and a connecting plate 54, both of which are made of stainless steel. The connecting plate 54 is fixedly connected to the powder inlet pipe orifice 51 and is horizontally arranged. The number of cloth cylinder baffles 53 is 2, and according to the difference of the front and rear positions, the cloth cylinder baffles 53 are arranged on the front side and the rear side of the powder inlet pipe orifice 51, and are arranged in the same radian as the radian of the cylinder of the ball mill shell 10, and the end faces of the arc bottom are polished, and the 2 arc cloth cylinder baffles 53 are fixed on a corresponding baffle frame 74 in a front-rear manner. One end of the 2 arc-shaped cloth cylinder baffles 53 close to the powder inlet pipe orifice 51 is fixedly connected with a connecting plate 54.

When the ball mill of the embodiment works, as shown in fig. 1 and 2, the discharge port of the wind power conveyor is connected to the material port flange 13 at the material port 10-1 of the ball mill body 1, and the wind power conveyor is started to enable the powder materials which are crushed in the previous step and pass through 20 to 40 meshes to be conveyed into the ball mill body 1, and the loading coefficient is not more than 55%. After the material is conveyed, the discharge port of the pneumatic conveyor is detached from the material port flange 13, and the ball mill cover is installed, so that the ball mill can perform ball milling on the material according to normal 360-degree rotation. In ball milling, crushed materials become powder which accounts for more than 90% of the weight of the materials and can pass through a 80-mesh sieve under the friction between ceramic balls with different diameters and ceramic plates serving as inner liners, and then powder can be discharged. The powder discharging method is the powder discharging method of the ball mill which is applicable to the preparation of the amino molding compound granules, and comprises the following steps:

(1) after the ball mill is completed according to the normal 360-degree rotation, the ball mill cover covering the material port 10-1 is removed from the material port flange 13, and then the ball mill is rotated to the position shown in fig. 1.

(2) Bolts connected with nuts are placed at the connection openings of the material port flange 13, and then the fence cover 21 of the powder discharging fence device 2, the connecting seat 23 of the powder discharging fence device 2 and the connecting part 32 of the powder discharging connecting device 3 are sleeved on a corresponding screw rod through the respective connection openings in sequence from top to bottom, so that the material port flange 13, the fence cover 21 of the powder discharging fence device 2, the connecting seat 23 of the powder discharging fence device 2 and the powder discharging connecting device 3 are detachably and fixedly connected together in sequence from top to bottom.

(3) The inner cloth cylinder 42 is arranged in the outer cloth cylinder 41, the upper port of the inner cloth cylinder 42 is bound on the limit part 34 of the powder discharging connecting device 3, and the middle lower part of the inner cloth cylinder 42 and the lower port extend into the material storage device 6; the upper end opening of the outer cloth tube 41 is also tied up to the limit part 34 of the powder discharge connection device 3, and the lower end opening of the outer cloth tube 41 is tied up to the powder inlet pipe opening 51.

(4) The variable-frequency speed-regulating motor 71 regulated by the programmable logic controller PLC is started, and the ball mill body 1 rotates around the rotating shaft 11 sequentially through the motor shaft, the coupler, the pinion 75 and the large gear 76.

(5) When the powder outlet fence device 2 of the ball mill body 1 rotates to the right lower side, the variable frequency speed regulating motor 71 is controlled by the programmable logic controller PLC, so that the movement mode of the ball mill body 1 can be regulated to do slow reciprocating swing around the rotating shaft 11. The swinging angle of the ball mill body 1 is 180-240 degrees. The specific swinging mode is as follows: the first stage is to stop 2+ -0.5 min after swinging twice at 2+ -0.5 rpm/min; the second stage is stopped for 2+/-0.5 min after swinging for two times at the rotating speed of 4+/-0.5 rpm/min; and in the third stage, swinging at the rotating speed of 4+/-0.5 rpm/min until the powder discharging is finished.

(6) In the swinging process, powder in the ball mill body 1 successively falls into a storage device 6 arranged below the ball mill from an inner layer cloth cylinder 4, and when the powder swings to a set time, the powder discharging is finished. Then the upper port of the lower outer cloth cylinder 41 can be disassembled, the powder discharging fence device 2 and the powder discharging connecting device 3 can be disassembled, and the discharge port of the upper wind power conveyor can be connected, so that the next grinding is ready.

In the powder discharging process, the powder discharging fence device 2 drives the outer cloth cylinder 41 and the inner cloth cylinder 42 to swing back and forth, so that the powder discharging fence device can be used as an effective channel for conveying powder, dust pollution in the powder discharging process is prevented, and noise can be greatly reduced, and the service lives of the inner lining and the porcelain ball of the ball mill can be prolonged.

Example 2

Referring to fig. 12 and 13, the rest of this embodiment is the same as embodiment 1 except that: the powder discharging connecting device 3 is composed of a powder discharging connecting piece 35 and a stainless steel lining 36, namely, the powder discharging connecting piece 35 and the stainless steel lining 36 together form the powder discharging connecting device 3, and the powder discharging connecting device 3 also comprises a supporting part 31, a connecting part 32, a strip-shaped boss part 33 and a limiting part 34. The powder outlet connector 35 is a steel integral piece, and the stainless steel liner 36 is a stainless steel plate with a thickness of 3 mm. The stainless steel lining 36 prevents powder from contacting the powder outlet connector 35.

The powder discharging connecting piece 35 is provided with a supporting part, a connecting part and a strip-shaped boss part, and the connecting part is provided with a corresponding connecting notch.

The support portion of the powder discharge connector 35, the portion of the stainless steel liner 36 that contacts the support portion, and the portion of the stainless steel liner 36 that protrudes downward from the support portion together constitute the support portion 31 of the powder discharge connector 3.

Since the connecting portion of the powder discharging connecting piece 35 is not in contact with the powder, the connecting portion and the connecting notch of the powder discharging connecting piece 35 are the connecting portion 32 and the connecting notch 32-1 of the powder discharging connecting device 3.

The strip-shaped boss portion of the powder discharge connector 35 and the portion of the stainless steel liner 36 in contact with the strip-shaped boss portion together constitute the strip-shaped boss portion 33 of the powder discharge connector 3.

The lower part of the stainless steel lining 36 extends downwards to form a supporting part of the powder outlet connector 35, and the lower end part of the stainless steel lining is provided with an outward and upward flanging which is used as a limiting part 34 of the powder outlet connector 3.

Claims

1. A ball mill suitable for preparing amino molding compound granules comprises a ball mill body (1), a powder outlet fence device (2), a motor (71), a motor frame (72) and a ball mill frame (73); the ball mill body (1) is provided with a material port (10-1); the ball mill body (1) is arranged on the ball mill frame (73) through a rotating shaft (11) and corresponding bearings and bearing seats; the motor (71) is arranged on the motor frame (72) and is connected with the rotating shaft (11) through a corresponding speed reducing mechanism; the method is characterized in that:

the device also comprises a powder outlet connecting device (3), an inner cloth cylinder (42) and a powder inlet pipe orifice assembly (5); the powder inlet pipe orifice assembly (5) comprises a powder inlet pipe orifice (51); the powder inlet pipe orifice (51) is fixedly arranged at the feed inlet of the storage device (6) for storing powder, the upper port of the powder inlet pipe orifice (51) extends upwards, and the powder inlet pipe orifice (51) is communicated with the inner cavity of the storage device (6) positioned below the powder inlet pipe orifice; the motor (71) is a variable-frequency speed-regulating motor;

When powder is discharged, the powder discharging fence device (2) is detachably and fixedly connected to the ball mill body (1) and is positioned at the material port (10-1), the powder discharging connecting device (3) is detachably and fixedly connected to the powder discharging fence device (2) and is communicated with the inner cavity of the ball mill body (1) through the powder discharging fence device (2), so that the ball mill body (1) is positioned at the material port (10-1), and the powder discharging fence device (2) and the powder discharging connecting device (3) form a ball milling swinging powder discharging passage; the powder inlet pipe orifice (51) of the powder inlet pipe orifice assembly (5) is separated from the powder outlet connecting device (3) by a certain distance; the upper port of the inner layer cloth cylinder (42) is bundled and sleeved on the ball milling swing powder outlet passage, the inner layer cloth cylinder (42) downwards passes through the powder inlet pipe orifice (51), and the lower port of the inner layer cloth cylinder is positioned in the storage device (6);

when the ball mill body (1) rotates to the position right below the powder outlet fence device (2), the movement mode of the ball mill body (1) is adjusted to swing back and forth around the rotating shaft (11); the swinging angle of the ball mill body (1) is 180-240 degrees.

2. A ball mill suitable for use in the preparation of amino molding compound pellets according to claim 1, wherein: also comprises an outer cloth cylinder (41); when powder is discharged, the outer cloth cylinder (41) is sleeved outside the inner cloth cylinder (42), the upper port of the outer cloth cylinder (41) is bundled and sleeved on the ball milling swing powder discharging passage, and the lower port of the outer cloth cylinder (41) is bundled and sleeved on the powder inlet pipe orifice (51);

The ball mill body (1) also comprises a ball mill shell (10) and a material port flange (13); the ball mill shell (10) is a cylinder body which is horizontally arranged, namely the axis of the ball mill shell is horizontally arranged along the left-right direction, the ball mill shell (10) is provided with a material port, namely the material port (10-1) of the ball mill body (1); the material port (10-1) is positioned at the middle position of the bottom of the ball mill shell (10); the material port flange (13) is fixedly connected with the ball mill shell (10) in a sealing manner and is positioned at the bottom of the material port (10-1);

the powder outlet fence device (2) comprises a fence cover (21), a column (22), a connecting seat (23) and a stainless steel wire mesh (24); the fence cover (21) and the connecting seat (23) are all integrated; the fence cover (21) has a central opening; the plurality of the column strips (22) are arranged, and each column strip (22) is fixedly arranged on the fence cover (21) along the front-back direction and is positioned at the central opening part of the fence cover (21); the connecting seat (23) comprises a net frame part (23-1) and 2 connecting parts (23-2) which are arranged left and right; the screen frame part (23-1) is positioned at the center and provided with a central opening; the connecting seat (23) is positioned below the fence cover (21), and is contacted and fixedly connected with the fence cover (21) through the connecting part (23-2) thereof; the stainless steel wire mesh (24) is horizontally arranged, welded and fixed on the mesh frame part (23-1) of the connecting seat (23), and positioned at the central opening of the mesh frame part (23-1);

The powder outlet fence device (2) is detachably and fixedly connected with the ball mill body (1), the connecting seat (23) and the fence cover (21) are fixedly connected with the material port flange (13) through fasteners, and the fixed connection is detachably and fixedly connected.

3. A ball mill suitable for use in the preparation of amino molding compound pellets according to claim 2, characterized in that: the fence cover (21) of the powder discharging fence device (2) comprises a fence frame part (21-1) and a square frame plate part (21-2); the fence frame part (21-1) is a rectangular frame body and consists of a front frame, a rear frame, a left frame and a right frame which are vertically arranged, and the space part surrounded by the rectangular frame body is the central opening part of the fence cover (21); the front and rear side frames of the fence frame part (21-1) are relatively and uniformly provided with through holes the number of which is the same as that of the column bars (22), and the sizes of the through holes are the same; the axes of the through holes are arranged along the front-back direction, and each through hole of the front frame corresponds to a corresponding through hole of the rear frame to form a corresponding group of through holes; the rectangular frame plate part (21-2) of the fence cover (21) is positioned around the fence frame part (21-1) and at the bottom of the fence frame part (21-1), and the thickness of the plate body of the rectangular frame plate part (21-2) is the same as that of the plate body of the fence frame part (21-1).

4. A ball mill suitable for use in the preparation of amino molding compound pellets according to claim 3, characterized in that: the fence cover (21) of the powder outlet fence device (2) also comprises a baffle plate part (21-3); the baffle plate part (21-3) comprises a front baffle plate and a rear baffle plate which are rectangular and have the same size; the upper end of the front baffle is connected with the front end of the rectangular frame plate part (21-2); the upper end of the rear baffle is connected with the rear end of the back frame plate part (21-2); the thickness of the front baffle and the rear baffle is the same as that of the plate body of the rectangular frame plate (21-2).

5. A ball mill suitable for use in the preparation of amino molding compound pellets according to claim 3, characterized in that: the height of the connecting part (23-2) of the connecting seat (23) of the powder discharging connecting device (3) is larger than that of the net frame part (23-1), and the upper surfaces of the connecting seat and the net frame part are flush; the powder discharging connecting device (3) is an integral piece and comprises a supporting part (31), a connecting part (32), a strip-shaped boss part (33) and a limiting part (34); the supporting part (31) is of a rectangular cylindrical structure, a square hole at the center, namely a material channel, and the four peripheral dimensions of the supporting part correspond to the peripheral dimensions of the net frame part (23-1) of the connecting seat (23); the number of the connecting parts (32) is 2, and the connecting parts are connected to the supporting parts (31) from left and right sides; the number of the strip-shaped boss parts (33) is 2, and the strip-shaped boss parts are connected to the top of the supporting part (31) from left to right from the upper part; the strip-shaped boss parts (33) are rectangular strip-shaped bodies extending along the front-back direction, and the distance between the inner side walls of the 2 strip-shaped boss parts (33) is larger than the length of the stainless steel wire mesh (24); the distance between the outer side walls of the 2 strip-shaped boss parts (33) corresponds to the distance between the inner sides of the 2 connecting parts (23-2) of the connecting seat (23); the limiting part (34) is a square annular boss limiting part, is arranged at the lower end part of the supporting part (31), and protrudes outwards in the radial direction.

6. A ball mill suitable for use in preparing amino molding compound pellets as claimed in claim 5, wherein: the material port flanges (13) of the ball mill shell (10) are respectively provided with connecting openings facing the outer sides of the left side and the right side at the 4 corners; the fence cover (21) is also provided with connecting notches (21-2-1) towards the outer sides of the left and right sides at 4 corners of the rectangular frame plate part (21-2); the 2 connecting parts (23-2) of the connecting seat (23) are respectively provided with a corresponding connecting notch (23-3) facing the outer sides of the left side and the right side at the front part and the rear part of each connecting part; the 2 connecting parts (32) of the powder discharging connecting device (3) are respectively provided with a corresponding connecting notch (32-1) facing the outer sides of the left side and the right side at the front part and the rear part of each connecting part;

when powder is discharged, each connecting notch on the material port flange (13) is aligned with a corresponding connecting notch (21-2-1) of the fence cover (21), a corresponding connecting notch (23-3) of the connecting seat (23) and a corresponding connecting notch (32-1) of the powder discharging connecting device (3) one by one in sequence from top to bottom, the corresponding 4 screw rods serving as fastening pieces are embedded into the corresponding connecting notch aligned in the same group inwards at the outer sides in the left-right direction, and then the 4 screw rods serving as fastening pieces are screwed and screwed on the corresponding one screw rod, so that the material port flange (13), the fence cover (21), the connecting seat (23) and the powder discharging connecting device (3) are connected together in a detachable and fixed mode.

7. A ball mill suitable for use in the preparation of amino molding compound pellets according to claim 1, wherein: the powder inlet pipe orifice assembly (5) comprises a powder inlet pipe orifice (51); the powder inlet pipe orifice (51) is an integral part and is positioned right below the bottom of the powder outlet connecting device (3) of the ball mill during powder outlet; the bottom of the powder inlet pipe orifice (51) is fixed on the powder inlet port part of the storage device (6), and the top of the powder inlet pipe orifice is provided with a second limiting part (52); the second limiting part (52) is a flanging part facing to the outer side of the upper end of the powder inlet pipe orifice (51); the lower port of the powder inlet pipe orifice (51) faces downwards and is communicated with the inner cavity of the storage device (6).

8. A ball mill suitable for use in preparing amino molding compound pellets according to claim 7, wherein: also comprises a baffle frame (74); the powder inlet pipe orifice assembly (5) further comprises a cloth cylinder baffle (53) and a connecting plate (54); the connecting plate (54) is fixedly connected to the powder inlet pipe orifice (51) and is horizontally arranged; the number of the cloth cylinder baffles (53) is 2, and the cloth cylinder baffles are arranged at the front side and the rear side of the powder inlet pipe orifice (51) according to the difference of the front and the rear positions; each arc cloth cylinder baffle (53) is fixedly arranged through a corresponding baffle frame (74) fixed on the foundation; one end of each arc-shaped cloth cylinder baffle plate (53) close to the powder inlet pipe orifice (51) is fixedly connected with the connecting plate (54).

9. The powder discharge method of a ball mill suitable for use in the preparation of amino molding compound pellets according to one of claims 1 to 8, having the steps of:

(1) after ball milling is finished according to normal 360-degree rotation, a ball mill cover covering a material port (10-1) is removed from a material port flange (13), and then the ball mill body (1) is rotated to a position of the material port flange (13) facing downwards;

(2) bolts connected with nuts are placed at the connection openings of the material port flange (13), and then the fence cover (21) of the powder discharging fence device (2), the connecting seat (23) of the powder discharging fence device (2) and the connecting part (32) of the powder discharging connecting device (3) are sleeved on a corresponding screw rod through the respective connection openings in sequence from top to bottom, so that the material port flange (13), the fence cover (21) of the powder discharging fence device (2), the connecting seat (23) of the powder discharging fence device (2) and the powder discharging connecting device (3) are detachably and fixedly connected together in sequence from top to bottom;

(3) the inner cloth cylinder (42) is arranged in the outer cloth cylinder (41), the upper port of the inner cloth cylinder (42) is bound on the limit part (34) of the powder discharging connecting device (3), and the middle lower part of the inner cloth cylinder (42) and the lower port extend into the storage device (6);

(4) Binding the upper port of the outer cloth cylinder (41) on a limit part (34) of the powder outlet connecting device (3), and binding the lower port of the outer cloth cylinder (41) on a powder inlet pipe orifice (51);

(5) starting a motor (71) regulated and controlled by a programmable logic controller, enabling the ball mill body (1) to rotate around a rotating shaft (11) by an angle not exceeding 90 degrees sequentially through a motor shaft, a coupler, a pinion (75) and a large gear (76), and then enabling the ball mill body to reversely rotate;

(6) when the ball mill body (1) rotates until the powder outlet fence device (2) is positioned right below, the movement mode of the ball mill body (1) is regulated by a PLC control program to do slow reciprocating swing around the rotating shaft (11); the swinging angle of the ball mill body (1) is 180-240 degrees;

(7) powder in the ball mill body (1) falls into a storage device (6) arranged below the ball mill sequentially through an inner layer cloth cylinder (4) in the swinging process, and the powder discharging is finished when the powder swings to a set time.

10. A powder discharge method of a ball mill suitable for use in preparing amino molding compound pellets as claimed in claim 9, characterized by: the specific swinging mode of the reciprocating swinging in the step (6) is as follows: the first stage is to stop 2+ -0.5 min after swinging twice at 2+ -0.5 rpm/min; the second stage is stopped for 2+/-0.5 min after swinging for two times at the rotating speed of 4+/-0.5 rpm/min; and in the third stage, swinging at the rotating speed of 4+/-0.5 rpm/min until the powder discharging is finished.