119 results about "Crushing procedure" patented technology

The invention provides a rare earth sintered magnet and a manufacturing method thereof. The magnetic property residual magnetism Br of the magnet is between 12.8 and 13.3 kGs, the intrinsic coercivity Hcj is more than or equal to 30 kOe, and the content of oxygen in the magnet is between 500 and 900 ppm. The rare earth sintered magnet is prepared by the manufacturing process that: a smelting procedure is a vacuum quick-setting process, and the thickness of produced sheet alloys is between 0.1 and 0.5mm; a hydrogen decrepitation process is used for production in an intermediate crushing procedure; a jet mill is used for production in a micro powder manufacturing procedure, and the average particle size of micro powder is between 3.0 and 4.5 mu m; a compression procedure is used for compression molding under the environment of anaerobic inert gas; and a sintering procedure is used for sintering and aging by means of a vacuum sintering furnace.

The invention relates to the processing field of natural rubber, and discloses a rubber processing process. The process comprises procedures of crushing, creping, granulating, baking, weighing and packaging. The process is characterized by adding an extruding procedure following the crushing procedure, wherein, the extruding procedure is repeated twice, the creping procedure is repeated eight times, and the granulating procedure is repeated twice. The process can help further remove foreign matters and ash from the rubber, enhance consistence of the rubber, achieve better softness of the rubber, ensure even mixing of different batches of raw materials with different quality conditions, wholly enhance consistence and stability of the physical and chemical properties of finished products, produce rubber materials for manufacturing high-quality tires, make full use of the raw materials with different quality conditions, greatly relieve limitation of raw material selection, and enhance added value of the products.

The invention belongs to the technical field of waste lead-acid storage battery recycling and discloses a recycling device of a waste lead-acid storage battery and a technological process of the recycling device of the waste lead-acid storage battery. The recycling device of the waste lead-acid storage battery aims to solve the problem that in the prior art, a battery crushing procedure and a screening procedure are separated, so that treatment time is long, and then the recycling efficiency of the waste battery is influenced. The recycling device comprises an installation frame. The top of the installation frame is fixedly provided with a fixing seat, and the top of the fixing base is fixedly provided with a recycling seat. The recycling seat is provided with a recycling cavity, and thetop of the recycling seat is fixedly connected with a feeding pipe. The feeding pipe communicates with the recycling cavity. Two driving motors are symmetrically and fixedly mounted on the inner wallof one side of the recycling cavity, and crushing shafts are fixedly connected to output shafts of the driving motors. The structure of the recycling device is simple, and the recycling device body integrates crushing, screening and collecting of the waste battery, so that the processing time of the waste battery is shortened, and the recycling efficiency of the waste battery is effectively improved.

The invention discloses a flaky metal powder production process, which is used for producing metal powder in a uniform shape by means of simple procedures. The technical scheme of the flaky metal powder production process mainly includes that the procedures sequentially include material selecting, crushing, grinding, classifying and collecting in an environment at the temperature lower than 50 DEG C, both the crushing procedure and the grinding procedure are completed in a cylindrical ball mill by a dry powder ball-milling method, and grinding aids are added in the grinding procedure. The ball mill used in the flaky metal powder production process is cylindrical so that produced metal powder in more uniform in shape, the ball mill is used for dry powder ball-milling, and a drying step in wet ball-milling is omitted so that the procedures are simpler.

The invention provides a method for preparing a high-magnetism magnetoplumbite-structure permanent magnetic ferrite material without adopting rare-earth element substitution, and the method comprises a blending procedure, a preburning procedure, a coarse crushing procedure, a fine grinding procedure, a forming procedure and a sintering procedure. According to the method, the residual magnetic induction intensity Br and intrinsic coercivity Hcj of a permanent magnetic ferrite are enhanced by carrying out secondary calcining in the preburning procedure, so that the permanent magnetic ferrite achieves the magnetic induction intensity Br more than or equal to 400 mT and the intrinsic coercivity Hcj more than or equal to 322.3 kV / m.

The invention relates to the field of sintered rare earth permanent magnetic materials, and particularly relates to a preparation method of a sintered rare earth permanent magnetic material. The preparation method comprises the procedures of preparing, burdening, smelting, coarse crushing, fine crushing, profiling, sintering, heat treating, machining, surface treating and crystal boundary permeating, wherein the crystal boundary permeating procedure can be carried out between the smelting procedure and the coarse crushing procedure or between the coarse crushing procedure and the fine crushing procedure. According to the invention, the problems that a permeation depth is limited and a large permanent magnet cannot be produced by a particle boundary permeating technology and the problem of secondary processing waste caused by magnet deformation due to the particle boundary permeating technology are overcome, residual magnetism is not lost as much as possible while the coercive force and the operating temperature of a sintered Nd-Fe-B permanent magnetic material are enhanced, and the consumption of heavy rare earth (namely Dy and Tb) with high prices is reduced.

The invention relates to a method for mixing and kneading carbon anode paste for aluminum electrolysis. The method comprises the steps of: adding partial powder (namely carbon ball milled powder or dust collection powder of a calcining or intermediate crushing procedure during the production of carbon) in a carbon anode formula to a molten coal tar pitch used as a bonding agent in advance, uniformly stirring, then mixing and kneading with dried materials, forming, and roasting to obtain an anode. The method aims at improving the volume density, true density, compression strength, resistivity,thermal expansibility and other properties of the carbon anode, and has the advantages of low implementation cost, simplicity in operation and cleanness.

The invention discloses a sintered Nd-Fe-B magnet manufacturing method and device. The method comprises the following steps: in the manufacturing procedure of Nd-Fe-B system sintered magnet in which the oxygen content is below 2,500 ppm and in the crushing procedure under the condition that the oxygen content in inert gas is below 1,000 ppm, after the grading step, a mixing step is added to re-mix the originally separated ultrafine powder into finished crushed powder, and the originally separated ultrafine powder enters the follow-up processing procedure together with the finished crushed powder. By adopting the method, in the follow-up sintering procedure, AGG (Abnormal Grain Growth) can not be easily caused in the follow-up sintering procedure, besides, precious rare earth can be saved and extremely high pricing competitiveness is achieved through material conservation.

The invention discloses a sintered Nd-Fe-B magnet manufacturing method and device. The method comprises the following steps: in the manufacturing procedure of Nd-Fe-B system sintered magnet in which the oxygen content is below 2,500 ppm and in the crushing procedure under the condition that the oxygen content in inert gas is below 1,000 ppm, and the grading step is omitted, so that ultrafine powder which is originally separated is continually mixed in finished crushed powder and enters the follow-up processing procedure together with the finished crushed powder. By adopting the method, in the follow-up sintering procedure, AGG (Abnormal Grain Growth) can not be easily caused in the follow-up sintering procedure, and the characteristics such as simplifying the procedure and lowering the production cost, are achieved.

The invention discloses a method for preparing ultramicro boron-carbide powder by using waste slurry from fine grinding of sapphire, and belongs to the technical field of processing of ultra-hard materials. The method is mainly characterized in that the boron carbide from the waste slurry of fine grinding of the sapphire can be recovered by procedures of solid-liquid separation, crushing, purification, water separation and drying, and are used for preparing boron-carbide ultra-fine refractory materials, boron-carbide pressureless sintering materials and boron-carbide hot-pressing sintering materials. The method disclosed by the invention has the advantages that comprehensive recovery of the boron carbide in the waste slurry from fine grinding of the sapphire is realized, so that the environmental pollution is reduced and the processing cost of the sapphire is greatly reduced; the method for preparing the ultramicro boron-carbide powder by adopting the waste slurry as raw materials is provided, so that wastes are changed into valuables, and secondary utilization of resources is realized; in addition, due to finer granularity of the boron carbide in the waste slurry, the redundant multi-stage crushing procedure in the conventional ultramicro-powder processing process can be avoided, and the processing difficulty of the ultramicro powder is obviously reduced. The method disclosed by the invention has the advantages of short process, low energy consumption, less pollution, simple and easy implementation and strong practicability and the like.

In order to solve the problems that an existing food processor is poor in uniformity of the material crushing effect, and the change of the load of a motor is large, the invention provides a food processor with a small-space crushing cover. The food processor comprises a cup body and a cutter body. The cutter body is arranged at the bottom of the cup body and is driven by a motor, the cutter body is provided with a water pumping part which enables water in the cup body to move towards the bottom of the cup body in the rotating process, the small-space crushing cover is arranged at the bottom of the cup body and on the periphery of the cutter body, the small-space crushing cover is provided with at least one top feed port and a plurality of discharge ports, and the maximal permission passing size of materials on the discharge ports is smaller than the original size of materials to be crushed. The food processor has the advantages that a material crushing procedure is divided into a small-space concentrated crushing stage and a cyclic crushing stage, so that the material crushing effect is greatly improved, and the uniformity of the crushing effect is guaranteed; the paste liquid level is always stable in the whole crushing procedure, and accordingly long-term stable operation of the motor is guaranteed.

The invention relates to the technical field of biomass fuel boilers, discloses a biomass boiler whole-pack feeding device. By using the device, the problems of altitude difference and longitudinal and horizontal displacement, material pack deviation and material inlet seal when the whole-pack of the biomass fuel pack feeds through adopting a sedan-type feeding mechanism, a material-pushing mechanism and a feeding channel are solved. Whole-pack storage of the biomass fuel pack can be realized after being packed; when in use, the biomass fuel pack is delivered to a furnace and is directly pushed and delivered to the furnace through the biomass boiler whole-pack feeding device; the bale breaking and crushing procedures in the prior art are saved; and electric consumption for crushing is saved. The feeding device has a marvelous technical advantage, and the reliability and economic property are improved greatly; and simultaneously a cooling tempering-proof structure is arranged in the feeding device, the firing possibility for the biomass fuel pack in the process of feeding is reduced obviously, and the safety of the device is improved.

The invention discloses a natural rubber processing technique which comprises the following procedures: crushing, creping, pelleting, drying, weighing and packaging. The natural rubber processing technique is suitable for mixing and processing rubber materials of different grades, a screening procedure is additionally set after the crushing procedure, and a hammer-crushing procedure is additionally set after the creping procedure. The invention aims to provide the natural rubber processing technique which is capable of enabling the processed rubber to be relatively high in consistency, stability and cleanness.

The invention relates to a semi-drying ceramic powder production method and a device thereof, which is characterized in that the method consists of crashing procedure, drying procedure, crushing procedure, iron-removing procedure, and granulation procedure. In the process of storing raw materials in a batching bin in the drying procedure, the dry hot air is pumped into the batching bin to reduce the water content of raw materials to be lower than 5 percent. And then, one or more dried raw materials are subject to the crushing procedure for being crushed into powder with a diameter of less than 0.125mm. Compared with the prior art, the semi-drying ceramic powder production method and device has the advantages of simple technique, small energy consumption, small investment, and low production cost.

The invention discloses a method for continuously producing a wood granular fuel. The method comprises the following steps: (1) a material preparation procedure, namely chipping a wood raw material to obtain wood chips with lengths less than 3 centimeters; (2) a coarse crushing procedure, namely crushing the wood chips to form coarse wood dust with the grain diameter of 5-6 millimeters; (3) a drying procedure, namely drying the wood dust till the water ratio of the wood dust is 10%-15% by weight; (4) a fine crushing procedure, namely crushing the coarse wood dust to form fine wood dust with the grain diameter less than 3 millimeters again; and (5) a granulating procedure, namely conveying the fine wood dust into a granulator and granulating. The method disclosed by the invention has the outstanding advantages that the application scope of raw materials is enlarged, forestry wastes are sufficiently utilized, equipment provided for a continuous production process is stable in property, high in automation degree and easy and convenient to operate and the energy conservation, emission reduction and safety are achieved.

The invention discloses a color sheet used for building coating. In the prior art, the color sheet is formed by mixing limestone powder filler coating or fine powder, such as heavy calcium carbonate, light calcium carbonate, or titanium dioxide filler, etc. into coating and then forming a film. The manufacturing efficiency of such color sheet or film is low and a plurality of procedures, such as coating, drying, knockout, crushing, etc. are needed, which consumes a lot of manpower, energy and time, has low output and high cost, and needs to consume a lot of organic materials. The invention directly dyes a basic diaphragm in appropriate specification into a film, dries the film, and then screens to obtain the color sheet. The color sheet of the invention effectively reduces the consumption of the film forming coating (the consumption of the film forming coating and color paste is less than 50 percent of the consumption of the traditional color sheet coating), saves the crushing procedure in the traditional preparation method, has 100 percent of color sheet yield, greatly improves the production efficiency, reduces the cost of the color sheet, has better water resistance, is not softened after being put in the coating for a long time, easy to be stored and transported.

The invention relates to a vibration screening machine which comprises an oblique screening plate. The vibration screening machine is characterized in that three sections of screening grooves, namely a front section screening groove, a middle section screening groove and a rear section screening groove, are formed in an object carrying face of the screening plate, wherein screening holes are formed in each section of screening groove, and the screening holes in the three sections of screening grooves are different in size and are used for screening materials with different specifications. A vibrating motor is arranged on a side plate on the left side of the screening plate, another vibrating motor is arranged on a side plate on the right side of the screening plate, a group of spring device used for buffering and continuing vibration is arranged on the front side below the screening plate, and another group of spring device used for buffering and continuing the vibration is arranged on the rear side below the screening plate. Due to the fact that the three sections of screening grooves are formed, the selection range of the materials is effectively expanded, construction waste can be respectively recovered according to different granule sizes, large waste impurities can be conveniently removed and crushed in a classified mode, repeated crushing procedures are reduced, power consumption is lowered, the crushing efficiency is improved, and the vibration screening machine has the advantages of being novel in design, simple in structure, convenient to operate and maintain, large in processing quantity, high in efficiency, low in power consumption and wide in material processing range.

The invention provides a crushing device and a crushing method for waste PP materials. The crushing device comprises a main body, a charging hopper, a first-stage crushing device, a second-stage crushing device, a third-stage crushing device and a screening device. The first-stage crushing device carries out cutting through sawtooth meshing, the second-stage crushing device carries out crushing through blades, the third-stage crushing device carries out crushing through gears, and the screening device is used for screening cut and crushed waste materials. According to the invention, before the waste materials enter the blades to be cut, a primary crushing device is arranged in a channel, the materials are cut into small parts for the first time, the crushing burden of the blades is relieved, and the service lives of the blades are prolonged. The materials are subjected to primary cutting, secondary blade crushing and third-time gear crushing through many times of crushing procedures, a high crushing degree is achieved, the materials reach a fine powder state after being crushed by the gears, and moreover, the swinging screening device is arranged after crushing, and the powder meeting the particle crushing requirement is screened out for reuse.

This invention relates to a recovering method for negative materials of cells including recovering waste negative pole plates or slurry preparing them, especially crushing the plates into slices by a miller with a rotating knife and putting the mixture containing graphite on the top of a vibration screen to vibrate them to get graphite particles or drying the slurry under low temperature to get graphite blocks then to be crushed to particles via a pre-crushing procedure, then, grinding the particles with a ball mill to get final powder to be confected to slurry added with CMC to adjust the viscosity and meet the requirement, which can utilize resources repeatedly and save manufacture cost.

The invention provides a static crushing structure for removing concrete and a construction method thereof. The static crushing structure comprises a concrete structure and a steel bar structure poured into the concrete structure. The static crushing structure further comprises an embedded pipe set embedded in the concrete structure, wherein the embedded pipe set is composed of a plurality of embedded pipes, and the pipe orifices of the embedded pipes are exposed out of the concrete structure. Since the embedded pipes are embedded in the concrete structure, when the concrete structure is removed, a worker just needs to pour an expanding agent into the embedded pipes and then add water into the embedded pipes, and then the interiors of the embedded pipes can be made to expand rapidly. Under the effect of the expanding static force, the concrete structure can be stripped from the steel bar structure slowly, and thus the problems that in the prior art, the number of static crushing procedures is large, and the cost is high are solved.

The invention relates to a recovery method for electronic waste and waste lead-acid cells, which belongs to the field of waste recovery. The recovery method comprises the following process flow: a crushing procedure for obtainment of a metal waste mixed material; a batching procedure of compounding the metal waste mixed material with ore having lead content of 25 to 60% so as to obtain a compound material with lead content of greater than 10%; a pellet ore compacting procedure of compacting the compound material and limonite into pellet ore; a mixing and smelting procedure of smelting biomass charcoal so as to obtain crude lead; a refined precipitation procedure for obtainment of a lead ingot; a fuming procedure; a slag iron smelting procedure for obtainment of slag iron and fused smelting furnace slag; and a ceramsite preparation procedure of molding the fused smelting furnace slag so as to obtain ceramsite, wherein the ceramsite produced in the ceramsite preparation procedure is used for planting photosynthetic bamboo which is then subjected to carbonization so as to obtain biomass charcoal, and the produced biomass charcoal is used in the mixing and smelting procedure. The method provided by the invention overcomes the defect of environmental pollution in the prior art and has the advantages of a high recovery rate, low cost and no pollution to the environment.

The invention relates to the field of white tea deep processing technology, in particular to a preparation method and a brewing method of ultrafine white tea. The preparation method comprises the steps of feeding, crushing, collecting and bagging, filtering and collecting and the like, wherein the temperature in the processing process is controlled to be in the range of 10-20 DEG C; the whole crushing procedure is completed in one step; according to the requirements of customers, the sizes of crushed particles can be adjusted through the numerical value of a rotating wheel till the particle size of the minimum tea powder is processed to be 80nm; the absorption rate of each functional ingredient of white tea in the human body is obviously increased, so that more than 500 types of ingredients of white tea remain; therefore, the unit areas of active ingredients of white tea absorbed in the human body are enlarged, the transportation of each functional ingredient of white tea in the human body is quickened, and the health functions of tumor resistance and reduction of high blood pressure, high blood sugar and high blood fat are improved. The brewing temperature is controlled to be in the range of 25-45 DEG C, and the loss of the activity and flavor of functional ingredients of white tea can be reduced.

The invention discloses a production technology of high-purity, ultrafine and high-whiteness natural barium sulfate. The production technology comprises a crushing procedure, an acid leaching procedure, a water washing procedure, an evaporation and concentration procedure and a membrane treatment procedure. Raw ores of barite are subjected to washed, rough milling, pulp blending and secondary finemilling, so that the granularity D90 of the ores is less than 1000 meshes or lower; then two-stage acid leaching and dust removal are carried out; then four-stage water washing is carried; after deepfine milling, drying and dust removal are carried out, high-purity and ultrafine natural barium sulfate with the purity of 94 to 98 percent, the whiteness of 94 to 98 percent and the granularity D90of 3000 to 10000 meshes or products of other grades can be obtained. The technology disclosed by the invention has extremely strong adaptability; the technology is simple to operate and low in production cost; the yield of the barium sulfate in the raw ores reaches 98 percent or more.

The invention relates to the technical field of garbage treatment, in particular to a treatment method for solid garbage. The method comprises the following steps that A, the solid garbage is centralized, and large piece impurity removing is conducted firstly; B, after impurity removing, the garbage is subjected to first-level crushing and crushed into pieces with the grain size below 40 mm, and iron removing and winnowing are conducted; C, materials enter the second-level crushing procedure, and the materials are subjected to fine crushing; and D, after fine crushing, the materials enter a screening procedure, and the materials are screened into three continuous grades including 5-10 mm, 10-20 mm and 20-40 mm according to the grain size. Movable equipment is adopted for aggregate crushing, and noise is low; finished aggregate is placed in a totally-closed silo; dust is prevented from being raised up through a conveying belt and a protection cover; at the dust releasing point, an advanced PPDC is adopted, and the dust removing efficiency is high; due to the workshop partition wall design, noise elimination treatment is conducted on the surfaces of double layers of walls, and noise elimination materials are arranged in a lining manner so as to prevent noise from being diffused; and large-area green belts are planted on the periphery of a plant, the noise elimination and dust suction functions are achieved, and the environment of the plant can be beautified as well.

The invention relates to a crushing and screening grading device for active carbon. The crushing and screening grading device comprises a first underframe, a second underframe, a crushing mechanism fixed to the first underframe and a screening grading mechanism fixed to the second underframe. The crushing mechanism is used for crushing the active carbon and can crush the active carbon twice. The screening grading mechanism is used for screening the crushed active carbon according to the granularity. The crushing and screening grading device has the function of crushing the active carbon and the function of graded screening of the crushed active carbon, and the crushing mechanism and the screening mechanism for the active carbon are integrated to replace a traditional processing mode that the crushing procedure of active carbon and the graded screening procedure of the active carbon are separated, so that the processing cost of the active carbon is reduced, automatic crushing and gradedscreening of the active carbon are achieved, and the processing efficiency is improved.

The invention relates to the technical field of quick lime processing, and specially relates to a quick lime crushing device. The defect that in the prior art, a crushing device is low in crushing efficiency is overcome. The quick lime crushing device comprises a box body, a crushing cavity and a grinding cavity; the crushing cavity and the grinding cavity are formed in the box body; a feeding opening is formed in the upper part of one side of the crushing cavity; a crushing ring hammer is arranged in the crushing cavity; a filter screen is arranged below the crushing cavity; a rotating plateis arranged below the filter screen; a rotating plate rotating shaft is arranged at one end of the rotating plate; a plurality of filter screen nails are arranged on the rotating plate; the filter screen nails are matched with filter holes in the filter screen; a rotating shaft of the rotating plate is fixedly borne by a rolling bearing installed in the box body, a material sliding plate is arranged in the box body and located below the crushing cavity and the grinding cavity, a flywheel is arranged in the grinding cavity, a discharging port is formed in one side of the box body, and after quick lime is subjected to two crushing procedures in the crushing cavity and the grinding cavity, the crushing effect and the crushing efficiency are both improved.

The invention relates to a smelting recovery method for lath-like residual titanium. The smelting recovery method includes the steps of residual titanium sizing, surface treatment, distribution and electrode binding, VAR smelting and finished titanium ingot treatment. The procedures of residual titanium crushing, mixing and electrode pressing are omitted, the manufacturing process flow is short, and operation is simple. The utilization rate of the residual titanium is high, specifically, 100% adding and recovery of the residual titanium can be achieved due to the fact that electrode pressing is not needed, the residual titanium adding proportion is increased to 100% from 30%, and the utilization rate of the residual titanium is greatly increased. The production cost is low, and specifically, the production cost is effectively lowered by shortening the manufacturing process flow and increasing the utilization rate of the residual titanium. The smelting recovery quality is good, specifically, due to the fact that the residual titanium crushing procedure is omitted, increment of impurity elements such as Fe, O and N in the crushing process can be effectively reduced, and the quality of titanium ingots obtained through smelting recovery is improved.

The invention discloses stone quick crushing equipment for rare earth processing. The stone quick crushing equipment structurally comprises movable wheels, a material discharge door, a pull handle, ahinge, a main body, a material charge pipe, a material charge hopper, a material outlet, stones, a connecting plate, a first crushing plate, a first conveying belt, a first transverse plate, a knocking mechanism, a first material discharge plate, a material discharge trolley, a first support plate, a material discharge device, rollers, a second material discharge plate, a second conveying belt anda second transverse plate. The stone quick crushing equipment for the rare earth processing has the advantage that two stone crushing procedures are performed in the main body, a crushing block on the knocking mechanism is used for crushing the large stones, the crushed stones are ground by a grinding plate on a grinding device for the second time, and then the larger stones can be processed intothe smaller stones, so that the stones can be effectively crushed by the secondary crushing type, the locking of the crushing equipment is avoided, and the working efficiency of the crushing equipment is improved.

The invention belongs to the technical field of chemical industry catalysts and particularly relates to a production method for a copper-zinc catalyst. The production method for the catalyst, disclosed by the invention, comprises the steps of subjecting precipitated slurry to spray drying, and then, subjecting spray-dried particles to pre-tabletting so as to form tablets with larger size, so as to replace the traditional method which comprises the steps of carrying out a material crushing procedure, then, crushing the tablets with larger size into particles with particle size smaller than 2mm by adopting a crusher, and then, carrying out tabletting so as to form the finished product of required specifications. According to the production method, accurate control on materials of different properties is achieved in a manner of controlling different compression ratios, so that control indexes are quantified, the labor intensity is lowered, and the product quality can be more stable.

The invention discloses a sand making method and a sand making device. The sand making method comprises a feeding procedure, a crushing procedure and a sorting procedure. The sand making method also comprises the step of adding a buffering material into a crushing machine, wherein the buffering material and materials are mixed and crushed to obtain a crushed material mixture. In the prior art, under high-speed operation of a rotor, large particles or blocky materials are thrown out and obtain high speed, fierce collision between the materials and between the materials and the inner wall of the crushing machine (namely 'collision between stones' or 'collision between stone and iron') causes generation of a great amount of dust and further influences the finished-product ratio and the quality of the products seriously; but in the technical scheme, since the procedure of adding the buffering material into the crushing machine is added, the collision mode of the materials is changed, on the basis of original collision, the collision between the materials and the buffering materials is increased, and the fierce degree of collision is properly reduced, so that the generation amount of the dust is greatly reduced and the finished-product ratio and the quality of the products are improved.