CN112827580A

CN112827580A - High-temperature planetary ball milling equipment

Info

Publication number: CN112827580A
Application number: CN202011634163.7A
Authority: CN
Inventors: 林晓晨; 许元顺; 张大鹏; 赵泽华; 马兵; 张后虎
Original assignee: Nanjing Institute of Environmental Sciences MEE
Current assignee: Nanjing Institute of Environmental Sciences MEE
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-05-25

Abstract

The invention discloses high-temperature planetary ball milling equipment which comprises a tray and a plurality of ball milling units, wherein the tray is provided with a plurality of ball milling units; the tray can rotate in the horizontal plane; the ball milling unit comprises an outer frame, an inner cylinder planetary gear and a plurality of metal grinding balls; the outer frame comprises a frame body, and the frame body is arranged on the tray and can rotate relative to the tray; the planetary gear is fixedly sleeved on the frame body, the planetary gear rotates, the rotating direction of the planetary gear is opposite to that of the tray, and the frame body rotates along with the tray and simultaneously rotates along with the planetary gear in the opposite direction; the inner cylinder comprises a cylinder body and is vertically fixed in the frame body; the wall of the barrel is internally covered with a heat-insulating layer, and the heat-insulating layer is internally covered with a wear-resistant layer; the magnetic yoke coil layer is also arranged in the cylinder body and is positioned outside the heat-insulating layer or embedded outside the heat-insulating layer; the magnetic yoke coil layer comprises a magnetic yoke and a coil, and the coil is positioned on the inner side of the magnetic yoke or embedded in the magnetic yoke; the coil is connected with a high-frequency power supply; the metal grinding balls are arranged in the cylinder body. The invention has the advantages of accurate temperature control, high efficiency, energy saving and the like.

Description

High-temperature planetary ball milling equipment

Technical Field

The invention belongs to the technical field of powder processing mechanical equipment, relates to ball milling equipment, and particularly relates to high-temperature planetary ball milling equipment.

Background

The planetary ball mill is a key device in the field of electronic raw material and nano material manufacturing, and is also a common powder processing device widely used in the industries of biology, food, cosmetics, medicine, material, mining, metallurgy and the like, and a cylinder revolves and rotates at a high speed, so that the steel balls or ceramic balls and the raw materials are sheared and collided, and the materials are crushed and ground. In the powder processing flow, the powder is often heated before and after the grinding process to achieve the effects of drying, high-temperature heat treatment or high-temperature reaction. In the prior art, grinding and heating belong to two processes, at least two sets of equipment are required, and the equipment occupies a large area. According to the properties of the processed powder, protective gas needs to be filled in some processing processes, the process and cost are increased by conveying and storing materials among multiple sets of equipment, and the cost can be reduced and the quality stability can be improved by integrating multiple processes. In modern material preparation, a method for promoting the reaction rate by utilizing the higher surface chemical energy at the moment of particle crushing is provided, and temperature control is also required in order to ensure the reaction to be carried out smoothly. Meanwhile, the existing planetary ball mill puts raw materials into a barrel at one time, stirs and crushes the raw materials and then pours the raw materials out, aiming at heterogeneous raw materials with different particle sizes or hardness, small particles or soft particles can be excessively ground before large particles or hard particles reach the target particle size, and the uniformity of the particle size of the product is poor. The continuous powder processing production method for realizing the combination of grinding and heat treatment has good application prospect and economic benefit, realizes instant screening in the stirring process, can avoid excessive grinding, and can improve the product quality while saving energy consumption.

In order to combine ball milling and heat treatment, the invention CN100460074C and CN102614965B adopt a technical route of placing the ball mill in a high-temperature furnace, all parts of the ball mill are easy to damage at high temperature, particularly driving and transmission parts, heating from outside to inside needs to heat the wall of the ball mill cylinder firstly, and then the heating is realized through heat transfer between the cylinder wall and a material, the contact area between the cylinder wall and the material is limited, and the material is slowly heated and unevenly heated. And the technology of placing the ball mill in a high-temperature furnace can only process materials in batches, and cannot realize continuous production. The invention CN107866312B and CN109282585B use hot air to dry materials, but because the specific heat of the gas is low, the energy which can be carried is limited, the gas heating temperature rise speed is slow in the practical situation, the effect is only limited to drying, and the higher temperature can not be reached. The invention application publication No. CN109663639A proposes that microwave is used for heating, theoretically, materials can be directly heated, and high-temperature pressure and heat loss to a cylinder body and related driving and transmission components are reduced, but in the prior art, the construction of large-scale microwave equipment and the shielding cost of microwave radiation are extremely high, the large-scale production is difficult to use, and the microwave heating only aims at microwave sensitive materials, the processable materials are limited, and the microwave heating has no universality.

Disclosure of Invention

Aiming at the defects of the existing high-temperature ball milling technology and equipment, the invention provides a technology and a device for heating a metal grinding ball by using electromagnetic induction, wherein the high-temperature ball milling processing under the control of precise temperature and reaction atmosphere is realized by utilizing the contact between the grinding ball and the material during grinding and carrying out efficient, rapid and uniform continuous heating on the target material in the closed space in the inner cylinder, and meanwhile, the ground powder is immediately taken out by the design of a gas path, so that excessive grinding is avoided, the energy consumption is further reduced, and the product quality is improved.

In order to achieve the above object, the present invention provides a high temperature planetary ball milling apparatus having the following features: comprises a tray and a plurality of ball milling units; the tray is horizontally arranged and can rotate around the center of the tray in a horizontal plane; the ball milling unit comprises an outer frame, an inner cylinder planetary gear and a plurality of metal grinding balls; the outer frame comprises a frame body, and the frame body is arranged on the tray and can rotate relative to the tray; the frame bodies of the ball milling units are uniformly distributed around the center of the tray; the planetary gear is fixedly sleeved on the frame body, the planetary gear rotates, the rotating direction of the planetary gear is opposite to that of the tray, and the frame body rotates along with the tray and simultaneously rotates along with the planetary gear in the opposite direction; the inner cylinder comprises a cylinder body which is vertically fixed in the frame body and rotates along with the frame body; the wall of the barrel is internally covered with a heat-insulating layer, and the heat-insulating layer is internally covered with a wear-resistant layer; the tube body is also internally provided with a magnetic yoke coil layer which is positioned outside the heat-insulating layer or embedded outside the heat-insulating layer, wherein the magnetic yoke coil layer is embedded outside the heat-insulating layer, namely the magnetic yoke coil layer is shorter than the heat-insulating layer, and the inner side and the two sides of the heat-insulating layer wrap the magnetic yoke coil layer; the magnetic yoke coil layer comprises a magnetic yoke and a coil, wherein the coil is positioned on the inner side of the magnetic yoke or embedded in the magnetic yoke, and the coil embedded on the inner side of the magnetic yoke means that the coil is fixed in the magnetic yoke and positioned on the inner side relative to the integral magnetic yoke; the coil is connected with a high-frequency power supply; a plurality of metal grinding balls are arranged in the cylinder body; the material is put into the barrel, and the metal grinding ball makes the material ground in rolling barrel, and the coil is circular telegram high frequency alternating current produces alternating magnetic field in the barrel simultaneously, makes metal grinding ball surface produce the induction vortex and generates heat and then heats the material.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the magnetic yoke coil layer is embedded in the heat insulation layer positioned on the side wall; the coil is embedded inside in the yoke.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: wherein, the center of the bottom of the frame body is provided with a frame rotating shaft which protrudes downwards; the tray is provided with a plurality of rotating shaft holes which penetrate through the tray up and down, and the number of the rotating shaft holes is equal to that of the ball milling units and corresponds to that of the ball milling units one by one; the frame rotating shaft of each ball milling unit frame body passes through the corresponding rotating shaft hole and can rotate relatively in the rotating shaft hole; the planetary gear is positioned below the tray and fixedly sleeved on the part of the frame rotating shaft extending out of the tray downwards.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the device also comprises a base and a main shaft; the main shaft is vertically arranged on the bottom surface in the base and can be driven to rotate by the driving device; the center of the tray is fixedly sleeved on the main shaft and rotates along with the main shaft.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: wherein, a circle of internal gears are arranged in the side wall of the base, are positioned at the outer sides of the planetary gears of the ball milling units and are meshed with the planetary gears; when the tray drives the planetary gear to revolve, the planetary gear rotates under the action of the internal gear.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the ball milling device also comprises an air inlet and outlet control system which is communicated with the inner cylinders of all the ball milling units and controls air to enter and exit the inner cylinders.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the inner cylinder also comprises a cylinder cover, and the sealing cover is arranged on the top opening of the cylinder body; the ball milling unit is provided with an air inlet channel penetrating through the bottoms of the outer frame and the inner cylinder and an air outlet channel penetrating through the tops of the outer frame and the inner cylinder, and air enters the inner cylinder from the air inlet channel and is discharged from the air outlet channel; the air inlet and outlet control system comprises a plurality of spherical cap type cover plates which are respectively arranged in the inner cylinder of each ball milling unit and cover the ports of the air inlet channels of the ball milling units, and the spherical cap type cover plates are connected with the bottom surface of the inner cylinder through elastic pieces; when the air inlet pressure is higher than the pressure in the cylinder, the spherical cap type cover plate is pushed open by the air pressure; when the air inlet pressure is lower than the pressure in the cylinder, the spherical cap type cover plate is automatically closed through the restoring force of the elastic piece.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the air inlet and outlet control system also comprises an air inlet main channel and a plurality of air inlet branch pipelines, wherein the air inlet main channel is arranged at the bottom of the main shaft, the number of the air inlet branch pipelines is equal to that of the ball milling units and corresponds to that of the ball milling units one by one, one end of each air inlet branch pipeline is communicated with the air inlet main channel, and the other end of each air inlet branch pipeline is communicated with the air inlet channel of the corresponding ball milling unit through an airtight bearing; the air inlet and outlet control system also comprises an air outlet main channel and a plurality of air outlet branch pipelines, the air outlet main channel is arranged at the top of the main shaft, the number of the air outlet branch pipelines is equal to that of the ball milling units and corresponds to that of the ball milling units one by one, one end of each air outlet branch pipeline is communicated with the air outlet channel, and the other end of each air outlet branch pipeline is communicated with the air outlet channel of the corresponding ball milling unit through an airtight bearing; the gas enters the equipment through the gas inlet main channel and is discharged through the gas outlet main channel. The port of the air outlet channel is provided with a replaceable screen, when the air is discharged, the ground fine particles are taken out of the air outlet channel through the screen on the cylinder cover, the coarse particles are blocked by the screen, and the grinding is continued in the cylinder.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: wherein, all be equipped with the valve on branch pipeline of admitting air and the branch pipeline of giving vent to anger.

Further, the present invention provides a high temperature planetary ball milling apparatus, which may further have the following features: the outer frame further comprises a fastening support and a fastening screw rod, the fastening support is detachably fixed at the upper end of the frame body, the fastening screw rod penetrates through the fastening support, the lower end of the fastening screw rod abuts against the barrel cover, the fastening screw rod is in threaded connection with the fastening support, the fastening screw rod is screwed, and the fastening screw rod abuts against the sealed inner barrel of the barrel cover downwards.

The invention has the beneficial effects that:

firstly, an alternating magnetic field is generated in a coil by using current, so that a metal grinding ball generates an induced eddy current to generate heat, the heat directly acts on material powder, the heat does not act on other parts of equipment, the heating is direct, and the energy efficiency is high;

secondly, the grinding balls are large in number and large in contact area with the material powder material, and the contact between the grinding balls and the powder material is promoted by the overturning vibration during ball milling, so that the heat transfer is fast;

thirdly, a high-frequency power supply is adopted, because of the skin effect, the temperature in the metal ball is low, the heating is concentrated on the surface of the ball body, the heat transfer to the material powder is facilitated, the heating is directly and conveniently controlled, the heating is stopped when the power is cut off, no extra heat is stored in the steel ball, and the temperature control is accurate;

and fourthly, the coil is connected with an external power supply through a carbon brush, so that stable connection under high-speed rotation is realized.

Fifthly, according to the purpose of material drying or high-temperature reaction, wear-resistant high-chromium steel or high-temperature ferromagnetic material can be selected as required to manufacture the grinding ball, the use temperature range is wide, and the grinding ball can be widely applied to the processing of various powder materials;

grinding and heating processes are integrated, so that the intensification of equipment is realized, the occupied area of the equipment is reduced, the equipment is compact and is favorable for air tightness control, the equipment can be used for processing in an air atmosphere, protective gas or reaction gas can be introduced according to needs, and the application range is wide;

seventhly, the connection of the outer frame and the gas inlet and outlet branch pipeline uses an airtight bearing, the gas inlet and outlet branch pipeline only participates in revolution and does not rotate along with the cylinder body, and the rotation distortion of the pipeline is avoided;

eighthly, the inner side of the air inlet is provided with a spherical cap type cover plate, air does not escape from one point, but is sprayed out along an annular slit formed between the outer edge of the cover plate and the bottom plate in the cylinder body, and the contact range of the air inlet and the material is larger;

the spherical cap type cover plate can be opened only when the air inlet pressure is sufficient, and once the air inlet pressure is insufficient, the air inlet can be automatically closed due to elasticity, so that materials are prevented from entering and even blocking an air inlet channel.

And tenthly, in the process of using the reactive gas to react with the materials, the gas passes through the materials from bottom to top, so that the full contact of the gas and the materials is ensured, and the reaction is facilitated.

Eleven, in the process of using the reactive gas to react with the materials, the materials are stirred and ground while being heated, and the reaction products on the surface layer can be continuously stripped from the particles, so that the uniformity and the reaction rate of the high-temperature reaction are improved, and the efficiency is improved; meanwhile, the fresh surface exposed by the crushed material in the ball milling process has higher surface energy and high reaction activity, and is beneficial to improving the purity of the reaction product.

The heat insulation layer is arranged between the coil and the material powder material, and heat insulation and energy saving requirements and heat dissipation requirements of the coil in the powder heat treatment process are considered;

thirteen, use the yoke to distribute in the magnetic induction coil outside, except that fixed induction coil position, can also restrain the outside diffusion of induction leakage, improve induction heating's efficiency, as the magnetic screen, ensure the environmental security of equipment.

Fourteen, use the temperature sensor of non-metal, non-thermocouple type, has avoided the influence on temperature measurement of electromagnetic induction, combine the power adjustable, can realize the fine control of the temperature;

fifteen, use non-magnetism, non-conducting material preparation wearing layer, avoid producing electromagnetic shield to the metal ball, make induction heating concentrate inside the barrel, through the heat transfer directly conduct on the target material, energy-efficient.

Sixthly, increased the gas circuit, can use high-pressure gas to blow, vertical stirring material, reduced the material because the centrifugal force is formed the condition of material layer by the ball compaction on section of thick bamboo wall, improved the efficiency of grinding.

Seventhly, the levigated powder is timely taken out of the cylinder body from the gas outlet channel by gas, excessive grinding is avoided, energy is saved, meanwhile, the particle size distribution of the powder product is narrower, the uniformity of powder particles is better, and the product quality is improved.

Eighteen, the gas outlet screen cloth is removable, through using the filter screen control product fineness of different mesh sizes, more convenient and accurate than traditional method through grinding time control product granularity according to experience, the product particle diameter receives each batch of the influence that adds material quantity and raw materials fluctuate for a short time, and the quality is more stable.

Drawings

FIG. 1 is a schematic structural diagram of a high-temperature planetary ball milling apparatus.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the invention provides high-temperature planetary ball milling equipment, which comprises a tray 1, a plurality of ball milling units 2, a base 3, a main shaft 4 and an air inlet and outlet control system.

The tray 1 is horizontally arranged and can rotate around the center thereof in a horizontal plane.

The ball milling unit 2 includes an outer frame 21, an inner cylinder 22, a planetary gear 23, and a plurality of metal milling balls 24.

The outer frame 21 includes a frame body 211, and the frame body 211 is provided on the tray 1 and is rotatable with respect to the tray 1. The frame bodies 211 of the plurality of ball milling units 2 are evenly distributed around the center of the tray 1.

The planetary gear 23 is fixedly sleeved on the frame body 211, the planetary gear 23 rotates, the rotating direction of the planetary gear 23 is opposite to that of the tray 1, and the frame body 211 revolves along with the tray 1 and simultaneously rotates along with the planetary gear 23 in the opposite direction relative to the rotating direction of the tray 1.

Specifically, the bottom center of the frame body 211 has a frame rotation shaft 2111 protruding downward. The tray 1 is provided with a plurality of rotating shaft holes which are penetrated up and down, and the number of the rotating shaft holes is equal to that of the ball milling units 2 and corresponds to one. The frame rotating shaft 2111 of the frame body 211 of each ball milling unit 2 passes through the corresponding rotating shaft hole and can rotate relatively in the rotating shaft hole. The planetary gear 23 is located below the tray 1 and is fixedly sleeved on the portion of the frame rotating shaft 2111 extending downwards out of the tray 1.

The spindle 4 is vertically arranged on the bottom surface in the base 3 and can be driven to rotate by a driving device. The center of the tray 1 is fixedly sleeved on the main shaft 4 and rotates along with the main shaft 4. In a preferred embodiment, the side walls of the base may extend upwardly to a height outside the tray and bearings are provided between the tray and the side walls of the base to provide a more smooth rotation of the tray.

A ring of internal gears 5 are arranged in the side wall of the base 3, are positioned at the outer sides of the planetary gears 23 of the ball milling units 2, and are meshed with the planetary gears 23. When the tray 1 drives the planetary gear 23 to revolve, the planetary gear 23 rotates under the action of the internal gear 5.

In this embodiment, the planetary gear 23 is disposed at the bottom of the frame body 211, and the frame rotating shaft 2111 at the bottom of the planetary gear 23 drives the frame body 211 to rotate, and certainly, the planetary gear 23 may also be disposed at the top of the frame body 211, and the frame rotating shaft 2111 is disposed at the top of the frame body 211 to rotate the planetary gear, or the planetary gear 23 may also be directly fixed and sleeved outside the frame body 211 to rotate the frame body 211.

The inner cylinder 22 includes a cylinder 221 and a cylinder cover 222.

The cylinder 221 is vertically fixed in the frame body 211 and rotates with the frame body 211. An insulating layer 2211 is coated in the cylinder wall (including the side cylinder wall and the bottom cylinder wall) of the cylinder body 221, and a wear-resistant layer 2212 is coated in the insulating layer 2211. The heat preservation layer is a layer of heat preservation structure made of heat preservation and insulation materials. The insulating layer is made of non-magnetic and non-conductive materials, so that electromagnetic shielding is avoided, and preferably, in the application of lower heating temperature, the insulating layer is made of organic foaming materials; the insulating layer is made of porous ceramic refractory material under the high temperature requirement (higher than 200 ℃). Wear layer 2212 refers to a layer of wear structure formed from a wear resistant material. The material of the wear resistant layer is a non-magnetic, non-conductive material to avoid electromagnetic shielding, and is preferably made of a dense wear resistant ceramic such as zirconia or tungsten carbide.

The cylinder 221 is also provided with a magnetic yoke coil layer embedded in the insulating layer 2211 located on the side cylinder wall. Yoke coil layer comprises yoke 2213 and coil 2214, with coil 2214 embedded inside yoke 2213. Specifically, the magnetic yoke is of a structure formed by stacking strip-shaped sheets made of soft magnetic materials with high magnetic permeability, and can effectively control magnetic leakage, shield a magnetic field and guarantee environmental safety while supporting the coil. The coil is wound along the support built in the magnetic yoke.

The coil 2214 is connected with a high-frequency power supply, namely, the high-frequency alternating current power supply supplies power, the frequency range is 1000-100000 Hz, the power supply power is adjustable, a high-frequency alternating magnetic field generated by the high-frequency power supply has a skin effect, electromagnetic induction heating is concentrated on the surface of the grinding ball, heat transfer to materials is facilitated, heating is direct, and efficiency is high. Specifically, a carbon brush 25 is disposed in the rotating shaft hole, and the coil 2214 is connected to the frame body 211 through a wire, and then is connected to an external high-frequency ac power supply through the carbon brush 25.

For the multilayer structure in this embodiment, it is possible to add (for example, add other functional layers), combine (for example, use ceramic as the wear-resistant and heat-insulating layer), disassemble (for example, the coil and the yoke are separately disposed, and the yoke is located outside the coil), or adjust the sequence according to the actual application needs, but it should be defined as: the wear-resistant layer is positioned at the innermost side; the coil structure is positioned outside the heat-insulating layer or embedded outside the heat-insulating layer, so that heat insulation of the system is realized and heat dissipation of the coil is realized; the coil is positioned on the inner side of the magnetic yoke or embedded in the magnetic yoke, flux leakage is controlled, and the environmental safety of the system is guaranteed. For example, the yoke coil layer may also completely cover the outside of the insulating layer.

The cartridge cover 222 sealingly covers the top opening of the cartridge body 221. The cylinder cover is made of heat-insulating material, so that heat loss in the production heating process is prevented, and meanwhile, the cylinder cover and the cylinder body form a closed space required by production together in the cylinder body. A plurality of temperature-resistant sealing rings 223 are arranged between the cylinder cover 222 and the top opening of the cylinder body 221, so that the air tightness of the system is guaranteed.

The outer frame 21 further includes fastening brackets 212 and fastening screws 213. The fastening bracket 212 is detachably fixed to the upper end of the frame body 211; the fastening screw 213 penetrates through the fastening bracket 212, the lower end of the fastening screw is abutted against the cylinder cover 222, and the fastening screw 213 is in threaded connection with the fastening bracket 212; the tightening screw 213 is screwed, and the tightening screw 213 presses down against the cylinder cover 222 to seal the inner cylinder 22.

A plurality of metal grinding balls 24 are disposed in the cylinder 221. The metal grinding ball is made of wear-resistant high-chromium steel or nickel-based high-temperature alloy, the wear-resistant high-chromium steel is heated to a temperature below 300 ℃, and the nickel-based high-temperature alloy is heated to a temperature of 300 ℃ or above.

The materials are placed in the cylinder 221, when the cylinder 221 rotates, the metal grinding balls 24 grind the materials in the rolling cylinder 221, and meanwhile, the coil 2214 is electrified with high-frequency alternating current to generate an alternating magnetic field in the cylinder 221, so that induced eddy currents are generated on the surface of the metal grinding balls 24 to generate heat, and the materials are further heated.

In a preferred embodiment, the apparatus further comprises a non-metallic, non-thermocouple type temperature sensor disposed within the barrel for measuring the temperature of the material in the barrel. For example, a ceramic temperature sensor can be integrated on the wear-resistant layer, or an infrared sensor is selected to be arranged on the barrel cover, and infrared measurement is carried out on the temperature of the material in the heating ball milling system through the observation window. The temperature is accurately controlled by measuring the temperature in real time and controlling the power of a high-frequency power supply connected with the coil through a microcomputer.

The gas inlet and outlet control system is communicated with the inner cylinder 22 of each ball milling unit 2 to control gas to enter and exit the inner cylinder 22. Wherein, the air outlet part of the air inlet and outlet control system has the function of discharging control.

The ball milling unit 2 has a gas inlet passage 611 penetrating the bottom of the outer frame 21 and the inner cylinder 22 and a gas outlet passage 621 penetrating the top of the outer frame 21 and the inner cylinder 22. The gas enters the inner cylinder 22 through the gas inlet channel 611 and is discharged through the gas outlet channel 621. Specifically, the air inlet channel 611 passes through the frame rotating shaft 2111 and the bottom of the cylinder 221 of the inner cylinder 22. The air outlet passage 621 penetrates through the cylinder cover 222 and the fastening screw 213 of the inner cylinder 22. Specifically, the air inlet channel and the air outlet channel can be formed by aligning and connecting a plurality of through holes, and a sealing element is arranged between the through holes to ensure the integral air tightness; alternatively, the inlet passage and the outlet passage may be formed by an integral pipe passing through the above structures.

The air inlet and outlet control system comprises a plurality of spherical cap type cover plates 63 which are respectively arranged in the inner cylinder 22 of each ball milling unit 2 and cover the ports of the air inlet channels 611 of the ball milling units, and the spherical cap type cover plates 63 are connected with the bottom surface of the inner cylinder 22 through elastic pieces. The elastic member may be a spring.

The opening and closing of the spherical cap type cover plate 63 are controlled according to the relative magnitude of the intake pressure and the air pressure in the cylinder 221. When the air inlet pressure is higher than the pressure in the cylinder 221, the spherical cap type cover plate 63 is pushed open by the air pressure, the air enters the cylinder 221 through a circular slit formed between the edge of the spherical cap type cover plate 63 and the bottom of the cylinder 221 and passes through the material layer from bottom to top to form the protective atmosphere in the cylinder 221 or react with the material. When the air inlet pressure is lower than the pressure in the cylinder 221, the spherical cap type cover plate 63 is automatically closed through the restoring force of the elastic member, so that the materials are prevented from entering the air inlet channel 611, and the air inlet channel 611 is prevented from being blocked.

The port of the air outlet passage 621 on the cartridge cover 222 is provided with a replaceable screen 64. In the production process, the air inlet pressure is intermittently increased, so that the air flow carries the powder material to impact the screen, and the powder which is milled to be qualified and reaches the target fineness is blown out through the air outlet channel along with the air through the screen; the oversize powder particles which do not reach the target fineness can not pass through the filter screen and fall back due to gravity, and are continuously ground. The screen is replaceable, and the size of the screen hole can be selected according to the target fineness of the product.

The air inlet and outlet control system further comprises an air inlet main channel 612 and a plurality of air inlet branch pipes 613; the air inlet main channel 612 is arranged at the bottom of the main shaft 4; the number of the gas inlet branch pipes 613 is equal to that of the ball milling units 2 and corresponds to one another; one end of the gas inlet branched duct 613 is communicated with the gas inlet main passage 612, and the other end is communicated with the gas inlet passage 611 of the corresponding ball milling unit 2 through the airtight bearing 65. The air inlet and outlet control system comprises an air outlet main channel 622 and a plurality of air outlet branch pipelines 623; the air outlet main channel 622 is arranged at the top of the main shaft 4; the number of the gas outlet pipelines 623 is equal to that of the ball milling units 2 and corresponds to that of the ball milling units one by one; one end of the gas outlet pipeline 623 is communicated with the gas outlet channel, and the other end is communicated with the gas outlet channel 621 of the corresponding ball milling unit 2 through the airtight bearing 65. The airtight bearing maintains airtightness while ensuring the rotational connection.

Gas enters the apparatus through the inlet main channel 612 and exits through the outlet main channel 622.

Wherein, the inlet branch duct 613 and the outlet branch duct 623 are both provided with a valve 66. The inlet pressure may be reduced by closing the valve in the inlet branch 613 and the pressure in the drum 221 may be increased by closing the valve in the outlet branch 623.

When the grinding device works, a material A and a plurality of metal grinding balls 24 are arranged in the cylinder body 221 of the inner cylinder 22 in advance, an external motor drives the main shaft 4 and the tray 1 connected with the main shaft to rotate, and the inner cylinder 21 and the outer frame 21 rotate at a high speed along with the rotation of the tray 1 around the main shaft 4 and simultaneously generate high-speed rotation due to the relative motion of the planetary gear 23 and the inner gear 5 to drive the material A and the metal grinding balls 24 to move, so that the material A is ground. Meanwhile, the coil 2214 is electrified with high-frequency alternating current to generate an alternating magnetic field in the cylinder body, so that the surface of the metal grinding ball 24 generates induction eddy current to heat, and further materials are heated. Meanwhile, gas enters the cylinder 221 through the gas inlet and outlet control system to control the atmosphere in the cylinder 221, and reaction gas can be introduced according to production requirements to realize high-temperature reaction of the gas and materials. The inlet branch duct 613 and the outlet branch duct 623 are connected to the inlet channel 611 and the outlet channel 621 on the outer frame 21 through airtight bearings, and only revolve with the spindle 4 without rotating. The air inlet pressure is intermittently increased, so that the ground powder is carried by air and is taken out of the cylinder body from the air outlet through the screen, excessive grinding is avoided, and the uniformity of the particle size of the product is improved. After the gas carrying the ground powder is blown out, the solid is the target product after gas-solid separation; the gas can be reused after pressurization. If the reaction gas is used, a gas concentration sensor is arranged at the front end of the supercharging device, so that the influence on the product quality due to too low concentration of the reaction gas is avoided.

Claims

1. The utility model provides a high temperature planet ball-milling equipment which characterized in that:

comprises a tray and a plurality of ball milling units;

the tray is horizontally arranged and can rotate around the center of the tray in a horizontal plane;

the ball milling unit comprises an outer frame, an inner cylinder planetary gear and a plurality of metal grinding balls;

the outer frame comprises a frame body, and the frame body is arranged on the tray and can rotate relative to the tray; the frame bodies of the ball milling units are uniformly distributed around the center of the tray;

the planetary gear is fixedly sleeved on the frame body, the planetary gear rotates, the rotating direction of the planetary gear is opposite to that of the tray, and the frame body rotates along with the tray and simultaneously rotates along with the planetary gear in the opposite direction;

the inner cylinder comprises a cylinder body which is vertically fixed in the frame body and rotates along with the frame body;

the wall of the barrel is internally covered with a heat-insulating layer, and the heat-insulating layer is internally covered with a wear-resistant layer; the magnetic yoke coil layer is also arranged in the cylinder body and is positioned outside the heat-insulating layer or embedded outside the heat-insulating layer; the magnetic yoke coil layer comprises a magnetic yoke and a coil, and the coil is positioned on the inner side of the magnetic yoke or embedded in the magnetic yoke; the coil is connected with a high-frequency power supply;

a plurality of metal grinding balls are arranged in the cylinder body;

the material is put into the barrel, and the metal grinding ball makes the material ground in rolling barrel, and the coil is circular telegram high frequency alternating current produces alternating magnetic field in the barrel simultaneously, makes metal grinding ball surface produce the induction vortex and generates heat and then heats the material.

2. The high temperature planetary ball milling apparatus of claim 1, wherein:

the magnetic yoke coil layer is embedded in the heat insulation layer positioned on the side wall;

the coil is embedded inside in the yoke.

3. The high temperature planetary ball milling apparatus of claim 1, wherein:

wherein, the center of the bottom of the frame body is provided with a frame rotating shaft which protrudes downwards;

the tray is provided with a plurality of rotating shaft holes which penetrate through the tray up and down, and the number of the rotating shaft holes is equal to that of the ball milling units and corresponds to that of the ball milling units one by one;

the frame rotating shaft of each ball milling unit frame body passes through the corresponding rotating shaft hole and can rotate relatively in the rotating shaft hole;

the planetary gear is positioned below the tray and fixedly sleeved on the part of the frame rotating shaft extending out of the tray downwards.

4. The high temperature planetary ball milling apparatus of claim 3, wherein:

the device also comprises a base and a main shaft;

the main shaft is vertically arranged on the bottom surface in the base and can be driven to rotate by the driving device;

the center of the tray is fixedly sleeved on the main shaft and rotates along with the main shaft.

5. The high temperature planetary ball milling apparatus of claim 4, wherein:

wherein, a circle of internal gears are arranged in the side wall of the base, are positioned at the outer sides of the planetary gears of the ball milling units and are meshed with the planetary gears; when the tray drives the planetary gear to revolve, the planetary gear rotates under the action of the internal gear.

6. The high temperature planetary ball milling apparatus of claim 5, wherein:

the ball milling device also comprises an air inlet and outlet control system which is communicated with the inner cylinders of all the ball milling units and controls air to enter and exit the inner cylinders.

7. The high temperature planetary ball milling apparatus of claim 6, wherein:

the inner cylinder also comprises a cylinder cover, and the sealing cover is arranged on the top opening of the cylinder body;

the ball milling unit is provided with an air inlet channel penetrating through the bottoms of the outer frame and the inner cylinder and an air outlet channel penetrating through the tops of the outer frame and the inner cylinder, and air enters the inner cylinder from the air inlet channel and is discharged from the air outlet channel;

the air inlet and outlet control system comprises a plurality of spherical cap type cover plates which are respectively arranged in the inner cylinder of each ball milling unit and cover the ports of the air inlet channels of the ball milling units, and the spherical cap type cover plates are connected with the bottom surface of the inner cylinder through elastic pieces;

when the air inlet pressure is higher than the pressure in the cylinder, the spherical cap type cover plate is pushed open by the air pressure; when the air inlet pressure is lower than the pressure in the cylinder, the spherical cap type cover plate is automatically closed through the restoring force of the elastic piece.

8. The high temperature planetary ball milling apparatus of claim 7, wherein:

the air inlet and outlet control system also comprises an air inlet main channel and a plurality of air inlet branch pipelines, wherein the air inlet main channel is arranged at the bottom of the main shaft, the number of the air inlet branch pipelines is equal to that of the ball milling units and corresponds to that of the ball milling units one by one, one end of each air inlet branch pipeline is communicated with the air inlet main channel, and the other end of each air inlet branch pipeline is communicated with the air inlet channel of the corresponding ball milling unit through an airtight bearing;

the air inlet and outlet control system also comprises an air outlet main channel and a plurality of air outlet branch pipelines, the air outlet main channel is arranged at the top of the main shaft, the number of the air outlet branch pipelines is equal to that of the ball milling units and corresponds to that of the ball milling units one by one, one end of each air outlet branch pipeline is communicated with the air outlet channel, and the other end of each air outlet branch pipeline is communicated with the air outlet channel of the corresponding ball milling unit through an airtight bearing;

the gas enters the equipment through the gas inlet main channel and is discharged through the gas outlet main channel.

9. The high temperature planetary ball milling apparatus of claim 8, wherein:

wherein, all be equipped with the valve on branch pipeline of admitting air and the branch pipeline of giving vent to anger.

10. The high temperature planetary ball milling apparatus of claim 7, wherein:

the outer frame further comprises a fastening support and a fastening screw rod, the fastening support is detachably fixed at the upper end of the frame body, the fastening screw rod penetrates through the fastening support, the lower end of the fastening screw rod abuts against the barrel cover, the fastening screw rod is in threaded connection with the fastening support, the fastening screw rod is screwed, and the fastening screw rod abuts against the sealed inner barrel of the barrel cover downwards.