CN218262305U - Automatic granulation system for cubic boron nitride raw material - Google Patents

Abstract

The utility model discloses an automatic granulating system for cubic boron nitride raw materials, which comprises a mixer, a raw material buffer bin, a weighing sensor, a forced feeding device hopper, a pressing double-roller, a pressing motor, a spherical crushing double-roller, a crushing double-roller motor, a screening machine, a packing machine, a discharge valve and a central processing unit; the discharge hole of the mixer is communicated with the feed inlet of the raw material buffer bin, the weighing sensor is fixedly arranged at the bottom of the raw material buffer bin, and the discharge valve is arranged at the discharge hole of the raw material buffer bin; the tabletting double rollers are arranged under the discharge port of the raw material buffer bin, and the spherical crushing double rollers are arranged under the tabletting double rollers. The utility model discloses a spherical granule is made in dry-type roll-in, forces the compression molding through mechanical pressure, and the extrusion granule mainly is the particle strength who leans on the effort formation between the molecule, does not add any wetting agent and adhesive, can effectively guarantee raw materials purity to need not carry out subsequent drying process, with the automated control who realizes the granulation process.

Description

Automatic granulation system for cubic boron nitride raw material

Technical Field

The utility model relates to a superhard materials synthesis technology field especially relates to an automatic granulation system of cubic boron nitride raw materials.

Background

At present, cubic boron nitride (cBN) is a superhard material artificially synthesized with hardness second to diamond, when a cubic boron nitride tool is used for processing iron series metals and alloy materials thereof, the cubic boron nitride tool has obvious affinity with iron and carbon elements, has unique characteristics obviously superior to those of a diamond tool, has stable crystal structure and higher oxidation resistance temperature which is about 1300k, and becomes the most suitable processing material in the fields of machinery, automobiles and related industries. At present, the common synthesis method of cBN single crystal is a static high-pressure catalyst method, the main raw materials are hexagonal boron nitride (hBN) and catalyst, the hexagonal boron nitride (hBN) and the catalyst are mixed according to a certain proportion, pre-pressed and formed, and then synthesized at high temperature and high pressure.

The crystal structure of the hexagonal boron nitride is similar to a graphite lamellar structure, is light white loose powder, easily generates dust, pollutes the air environment of a production workshop, and harms the body health of operators and the clean operation of equipment. In addition, in air, hBN is easy to adsorb water molecules, so that the effectiveness of the catalyst is obviously reduced, and the synthetic color and quality of cBN crystals can be influenced.

In the prior art, hexagonal boron nitride and prepared catalyst raw materials are uniformly mixed in a mixer, an operator pours the mixture into a closed charging basket for temporary storage after the mixture is mixed, the materials are repeatedly taken from the charging basket for weighing, bagging and vacuum packaging, the packaged materials are transferred to a pressing process, the bagged materials are pressed into massive shapes by a press machine, the massive shapes are manually crushed and sieved to be made into irregular granular shapes, then the granular materials are pre-pressed into cylindrical shapes on a four-column press machine, the cylindrical materials are assembled with other parts and then dried, and cubic boron nitride crystals are synthesized by a cubic top press under high pressure.

The dust is easily generated in the process links of weighing, packaging, crushing, screening, conveying and the like, the air environment of a workshop is polluted, the health of operators is harmed, the hidden danger of production safety is realized, manual operation is mostly adopted in production, the automation degree is low, and the production efficiency and the production quality are influenced. Therefore, the automatic production control has important significance in improving the production efficiency and the product quality, saving manpower, reducing the labor intensity of workers, optimizing the production environment, saving energy, reducing consumption and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cubic boron nitride raw materials automatic granulation system can automize and realize cubic boron nitride raw materials automatic granulation, improves the quality of production efficiency and product.

The utility model adopts the technical proposal that:

an automatic granulating system for cubic boron nitride raw materials comprises a mixer, a raw material buffer bin, a weighing sensor, a forced feeding device hopper, a tabletting double-roller, a tabletting motor, a spherical crushing double-roller, a crushing double-roller motor, a screening machine, a packaging machine, a discharge valve and a central processing unit; the discharge hole of the mixer is communicated with the feed inlet of the raw material buffer bin, the weighing sensor is fixedly arranged at the bottom of the raw material buffer bin, and the discharge valve is arranged at the discharge hole of the raw material buffer bin; the automatic material screening machine is characterized in that the pressing sheet pair rollers are arranged under a discharge port of the raw material buffer bin, the spherical crushing pair rollers are arranged under the pressing sheet pair rollers, the material screening machine is arranged under the spherical crushing pair rollers, an output shaft of the pressing sheet motor is fixedly connected with the pressing sheet pair rollers, the output shaft of the crushing pair roller motor is fixedly connected with the spherical crushing pair rollers to provide power for the spherical crushing pair rollers, an output end of the weighing sensor is connected with an input end of the central processing unit, and an output end of the central processing unit is respectively connected with a control input end of the pressing sheet motor, the crushing pair roller motor, the discharging valve and the material screening machine.

The vacuum feeding device is characterized by further comprising a first vacuum feeding machine and a vacuum feeding valve, wherein the first vacuum feeding machine is arranged between a discharge port of the mixer and a feed inlet of the raw material cache bin, the vacuum feeding valve is fixedly arranged at the discharge port of the vacuum feeding machine, and the control input end of the vacuum feeding machine is in control connection with the output end of the central processing unit.

The material screening machine is a circular double-layer screening machine and is used for screening materials with different sizes, so that unqualified materials are divided into coarse materials and fine powder.

The upper layer screen mesh of the round double-layer screen machine is 20 meshes, and the lower layer screen mesh is 100 meshes.

The feeding device is characterized by also comprising a feed back system, wherein the feed back system is used for collecting unqualified materials discharged from the material screening machine and conveying the unqualified materials to a feeding hopper of the forced feeding device for repeated production.

The feed back system comprises a coarse material recovery part for recovering large-particle materials obtained by the upper-layer screen and a fine powder recovery part for recovering fine powder materials obtained by the lower-layer screen.

The coarse material recovery part comprises a coarse material buffer bin and a spiral feeding machine, a feed inlet of the coarse material buffer bin is communicated with a discharge outlet of the upper screen, a feed inlet of the spiral feeding machine is communicated with the coarse material buffer bin, a discharge outlet is communicated with a feed hopper of the forced feeding device,

the fine powder recovery part comprises a fine powder buffer bin and a second vacuum feeding machine, a feed inlet of the fine powder buffer bin is communicated with a discharge outlet at the bottom of the lower-layer screen, a feed inlet of the second vacuum feeding machine is communicated with the fine powder buffer bin, and a discharge outlet is communicated with a feeding hopper of the forced feeding device.

Still including aggregate buffering storehouse and the feed bin of weighing, aggregate buffering storehouse set up directly over the feed bin of weighing, and the two intercommunication, the feed inlet in aggregate buffering storehouse and the aggregate discharge gate intercommunication of sieve machine, the discharge gate of the feed bin of weighing and packagine machine's feed inlet intercommunication.

The utility model discloses an adopt dry-type roll-in to make globular granule, through mechanical pressure forced compression shaping, the extrusion granule mainly leans on the granule intensity of effort formation between the molecule, do not add any wetting agent and binder, can effectively guarantee raw materials purity, and need not carry out subsequent drying process, further start to whole granulation process from the mixture of raw materials, raw materials powder such as hexagonal boron nitride (hBN) and catalyst is all sealed in container and pipeline, reduce the contact with the external environment, reduce the exposure degree of raw materials in the air and the pollution of solid dust to the production environment, and the operation space of this application is equipped with dehydrating unit, guarantee that operation environment humidity value is in specified technical requirement within range, prevent that hexagonal boron nitride (hBN) adsorbs the water molecule and takes place the reunion phenomenon in humid air, so that influence the validity of catalyst and the synthetic quality of cubic boron nitride (cBN) crystal; and finally, according to the characteristics of materials generated in the granulation process, the materials can be fully utilized by adopting a vacuum and spiral combined feeding method to complete the feeding task, and the weight of the materials in the raw material cache bin is used as a sampling monitoring object in the whole granulation process, so that the automatic control of the granulation process is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, the utility model comprises a mixer 1, a raw material buffer bin 5, a weighing sensor 6, a feeding hopper 7 of a forced feeding device, a pressing double-roller 8, a pressing motor 9, a spherical crushing double-roller 10, a crushing double-roller motor 11, a material sieving machine 12, a packing machine 22, a discharge valve and a central processor; a discharge hole of the mixer 1 is communicated with a feed hole of the raw material buffer bin 5, a weighing sensor 6 is fixedly arranged at the bottom of the raw material buffer bin 5, and a discharge valve is arranged at the discharge hole of the raw material buffer bin 5; the automatic material screening device is characterized in that the pressing sheet pair roller 8 is arranged under a discharge port of the raw material buffer bin 5, the spherical crushing pair roller 10 is arranged under the pressing sheet pair roller 8, the material screening machine 12 is arranged under the spherical crushing pair roller 10, an output shaft of the pressing sheet motor 9 is fixedly connected with the pressing sheet pair roller 8, an output shaft of the crushing pair roller motor 11 is fixedly connected with the spherical crushing pair roller 10 to provide power for the crushing pair roller, an output end of the weighing sensor 6 is connected with an input end of a central processing unit, and an output end of the central processing unit is respectively connected with a control input end of the pressing sheet motor 9, the crushing pair roller motor 11, a discharge valve and the material screening machine 12.

This application mixes the prefabrication through blendor 1 to the raw materials, then directly enter into in the raw materials buffering storehouse 5, the weighing sensor 6 through the bottom setting monitors how much of material in the raw materials buffering storehouse 5, thereby collocation baiting valve controls, realize automatic feed in the raw materials buffering storehouse 5, the feeding finishes, thereby start preforming motor and broken pair roller motor and drive corresponding preforming pair roller 8 and the rotation of spherical broken pair roller 10, raw materials buffering storehouse 5 blowing back, direct action of gravity feeds down between preforming pair roller 8 and the spherical broken pair roller 10, thereby become piece and globular granule, the material of suitable size can directly get into packagine machine and pack through sieve material machine screening, thereby accomplish automatic production, whole automated control, need not the manpower, and whole journey adopts machine-building, need not complicated step, the efficiency is greatly improved.

The automatic feeding device is characterized by further comprising a first vacuum feeding machine 3 and a vacuum feeding valve, wherein the first vacuum feeding machine 3 is arranged between the discharge hole of the mixer 1 and the feed inlet of the raw material caching bin 5, the vacuum feeding valve is fixedly arranged at the discharge hole of the vacuum feeding machine 3, and the control input end of the vacuum feeding machine is in control connection with the output end of the central processing unit. During the in-service use, adopt first vacuum material loading machine 3 and former storage bucket 2, make the raw materials that mix fall into former storage bucket 2, adopt hose 4 and 3 cooperation connections of first vacuum material loading machine to can realize the high-efficient material loading of take the altitude.

The material sieving machine 12 is a circular double-layer sieving machine and is used for sieving materials with different sizes, so that unqualified materials are divided into coarse materials and fine powder. The upper layer screen mesh of the round double-layer screen machine is 20 meshes, and the lower layer screen mesh is 100 meshes. The double-layer screening machine can realize three kinds of separation, namely, the separation is smaller than a set value, larger than the set value and meets the requirement. The granule screening adopts circular double-deck sieving machine to select separately the material, has advantages such as screen line length, screening specification are many, efficient, vibration small in noise.

The feeding system is used for collecting unqualified materials discharged from the screening machine and conveying the unqualified materials to the feeding hopper of the forced feeding device for repeated production. The feed back system comprises a coarse material recovery part for recovering large-particle materials obtained by the upper-layer screen and a fine powder recovery part for recovering fine-powder materials obtained by the lower-layer screen. Coarse fodder retrieve part include coarse fodder buffering storehouse 18 and spiral material loading machine 21, the feed inlet and the upper screen cloth discharge gate intercommunication in coarse fodder buffering storehouse 18, the feed inlet and the coarse fodder buffering storehouse 16 intercommunication of spiral material loading machine 21, discharge gate and forced-feeding device loading hopper 7 intercommunication, fine powder retrieve part include fine powder buffering storehouse 16 and second vacuum material loading machine 19, fine powder buffering storehouse 16 feed inlet and lower floor's screen cloth bottom discharge gate intercommunication, second vacuum material loading machine 19's feed inlet and fine powder buffering storehouse 16 intercommunication, discharge gate and forced-feeding device loading hopper 7 intercommunication. Due to the adoption of mechanical pressing, the raw materials removed from the raw materials can still be prepared repeatedly for two times or even for many times, so that the raw materials are collected after screening to realize good material utilization, and resources are saved.

Still including aggregate buffering storehouse 17 and weighing bin 20, aggregate buffering storehouse 17 set up directly over weighing bin 20, and the two intercommunication, the feed inlet of aggregate buffering storehouse 17 and the aggregate discharge gate intercommunication of sieve 12, the discharge gate of weighing bin 20 and packagine machine 22's feed inlet intercommunication. By adopting the matching of the aggregate buffer bin 17 and the weighing bin 20, the collected qualified materials can accurately and quantitatively enter the packaging machine 22 when entering the packaging machine, and can be produced in cooperation with the qualified materials, so that the overall production efficiency is improved.

During the in-service use, because this application utilized the material dead weight to carry out the unloading, save the resource, so still be provided with during the in-service use and be used for supporting each part and can realize material passing complex support frame 23 from top to bottom. In actual production, for better control of automatic production, the system is further provided with an upper computer, the upper computer is connected with a central processing unit and used for controlling and operating the process, specifically, when hexagonal boron nitride (hBN) and catalyst powder raw materials are mixed uniformly and ready, after relevant production parameters are set on a display screen of a control system, the automatic control system starts to operate, a first vacuum feeding machine 3 starts, a feeding valve is opened, powder mixture in a raw material barrel 2 is sucked into a raw material buffer storage bin 5 through a suction hose 4 by using vacuum negative pressure generated by a vacuum pump, a bin scale, namely a weighing sensor 6, is arranged in the raw material buffer storage bin 5, the bin scale transmits electric current transmission signals from weighing sensors 4-20MA at the bottom of the bin to the control system, the actual weight of the materials is automatically calculated and displayed on the display screen, the upper limit value, the feeding value and the lower limit value of the materials in the raw material buffer storage bin 5 can be set on the display screen, and feeding equipment and discharging equipment are controlled, so that the actual materials are kept in a set range. When the weight of the materials in the raw material buffer bin 5 reaches the upper limit value, the system controls the vacuum feeding valve to be closed, the discharging valve is opened, and the materials are added into the feeding opening of the feeding hopper 7 of the forced feeding device. Meanwhile, the first vacuum feeding machine 3 opens a blowback valve to clean the filter screen. The first vacuum feeding machine 3 is provided with a compressed air back-blowing device, when discharging is carried out each time, compressed air pulses back-blowing the filter to drop powder adsorbed on the surface of the filter so as to ensure normal operation of the material suction, and the back-blowing finishes the operation stop of the first vacuum feeding machine 3 and waits for the next circulation of material suction task.

During the granulation, the system carries out real-time detection to the material weight in the raw materials buffer storehouse 5, and when material weight was less than the feed setting value in the raw materials buffer storehouse 5, restart first vacuum feeding machine 3 carries out the material loading process of repeating. When the weight of the materials in the raw material buffer bin 5 is lower than the minimum set value in the normal working process, the system sends out a warning signal that the weight of the materials is lower than the minimum value, and an operator is prompted to perform corresponding treatment. The hexagonal boron nitride and catalyst mixture flows out from a discharge port of a first vacuum feeder 3 to a feed port of a feeding hopper 7 of a strong feeding device and enters a degassing strong feeding device for degassing, so that the volume of the material is effectively compressed, the material is forced to enter a pair roller through a screw rod, the material is forced to pass through a gap between the two pair rollers which rotate relatively at the same rotating speed, under the action of the great extrusion force of a tabletting pair roller 8, a powder mixture generates plastic deformation and is forced to be compressed into a dense and hard thick sheet material, the sheet material falls off and enters a spherical crushing pair roller 10 for granulation, a plurality of hemispherical holes and holes with the same size are regularly arranged on the surface of a roller, the dry powder sheet material continuously and uniformly flows freely from the upper parts of the two rollers, enters a crushing pair roller biting area and is gradually bitten into a valley by the roller, along with the continuous rotation of roll, the spherical particle shape piece of pressure drops because of the dead weight, sieve to confined circular double-deck screen (12), the screen (12) sieves, the screen (12) is equipped with two-layer screen cloth, the upper strata is 20 mesh screen cloth, the middle level is 100 mesh screen cloth, after the screen (12) was started, the screen (12) vibrator drives the shale shaker case and makes the leap motion, the material that is less than the screen cloth aperture falls to the lower floor of screen cloth through the sieve mesh, be greater than the continuous leap motion of material in screen cloth aperture back discharge gate of this layer of screen cloth, thereby obtain the large granule material that is greater than 20 mesh on the upper strata, flow out from this layer of discharge gate and enter into inclosed coarse fodder surge bin, when accumulating to a certain amount through the time of system setting after through totally enclosed spiral feeder material loading machine feeding to strong feeding device loading hopper 7 feed inlet, carry out the secondary granulation. The lower layer obtains the fine powder material of less than 100 meshes and directly flows into the fine chat buffer storage bin 16, when a certain amount of fine powder material is accumulated, the fine powder material is pumped to a feeding opening of a feeding hopper 7 of the forced feeding device through a material pumping hose of a second vacuum feeding machine 19 when the certain amount of fine powder material passes through system setting, and secondary granulation is carried out. The granular material blocks with the meshes smaller than 20 and larger than 100 are obtained in the middle layer and flow out from the middle layer discharge port to the granular material buffer bin 17, so that the granular forming material required by production is obtained. After granulation is finished, a discharge valve of the granular material buffer bin 17 is opened to carry out weight recheck and then the process is switched to a packaging process, so that the automatic connection with the next process is realized.

The material is formed by forced compression under mechanical pressure, the granules subjected to extrusion granulation are mainly formed by the strength of the granules formed by acting force between molecules, the granules are pressed at normal temperature, any wetting agent and any adhesive are not added, the product purity is ensured, the subsequent drying process is not needed, and the connection and the transformation of the front and rear processes of the existing production flow are facilitated. Compared with other granulation methods, the method has the advantages of effectively improving the granule strength and the pre-pressing density of the synthesis rod in the next procedure, facilitating the conduction and the uniform distribution of the temperature and the pressure in the high-pressure cavity, reducing the pressure and the temperature loss, and improving the unit yield and the synthesis quality of the cubic boron nitride (cBN) crystal. The automatic implementation can continuously operate, the production target is completed to the maximum extent, the labor intensity of workers is reduced, the manpower resource is saved, the product quality and the working efficiency are improved, the operation environment is optimized, the physical health of operators and the automatic production control for the clean operation of equipment are protected, and the automatic production control has important significance in the aspects of improving the production efficiency and the product quality, saving manpower, reducing the labor intensity of the workers, optimizing the production environment, saving energy, reducing consumption and the like.

According to the method, according to the problems of loose and fine cubic boron nitride raw material powder, difficulty in forming, easiness in wetting and low automation degree, the dry-type rolling granulation method of forced feeding, double-roller pressing and double-roller spherical crushing is adopted to obtain compact particles, the forming effect is better than that of a common dry-type granulation method, the yield is about 90-95%, and the particle hardness is good. Tests show that the higher molding density of the pre-pressed particles is beneficial to the pressure transmission effect in the pressing process, and the pressure loss and the serious deformation of the particles under high pressure extrusion during growth are reduced, so that the synthesis quality is influenced. In the method, a weighing sensing technology is adopted to sample production data to realize automatic control, an upper computer in the system adopts a maintenance control 12-inch man-machine interface so as to control data input from an interface window and display of the production data, and a lower computer adopts a CP1H type ohm dragon PLC to carry out data input and output processing and automatic control on output equipment and devices; the system equipment device comprises a hexagonal boron nitride and catalyst mixed raw material barrel, a weighing buffer bin, a No. 1 vacuum feeding device, a No. 2 vacuum feeding device, a strong feeding device, a tabletting double-roller, a crushing double-roller, a tabletting motor, a crushing motor, a circular double-layer vibrating screen machine, a spiral feeding machine and the like. The mixture of the hexagonal boron nitride and the catalyst is loaded through a vacuum negative pressure pumping hose by adopting a vacuum loading method. In the feeding control process, the material weight in the cache bin is taken as a sampling object, and the starting and stopping of the feeding action are determined through comparison operation with a set value; fine powder produced by granulation is fed through a material pumping hose by vacuum negative pressure; the large-particle blank produced in the granulation process is fed by using a spiral feeding machine, and under the driving force of the blades during spiral rotation, the material moves forwards in the material pipe in a relative sliding mode with the spiral blades and the material pipe to complete the conveying of the material. Screening by adopting a double-layer circular screening machine after spherical crushing, screening out the hexagonal boron nitride and catalyst mixed particles required by production, storing the hexagonal boron nitride and catalyst mixed particles into a particle material buffering bin, and carrying out secondary granulation on the particles larger and smaller than the hexagonal boron nitride and catalyst mixed particles in a corresponding feeding mode so as to complete an automatic granulation task.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.

It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the application of the principles of the technology. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include more effective embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. An automatic granulation system of cubic boron nitride raw materials which characterized in that: comprises a mixer, a raw material buffer bin, a weighing sensor, a forced feeding device hopper, a tabletting double-roller, a tabletting motor, a spherical crushing double-roller, a crushing double-roller motor, a material sieving machine, a packing machine, a discharge valve and a central processor; the discharge hole of the mixer is communicated with the feed inlet of the raw material buffer bin, the weighing sensor is fixedly arranged at the bottom of the raw material buffer bin, and the discharge valve is arranged at the discharge hole of the raw material buffer bin; the automatic material screening machine is characterized in that the pressing sheet pair rollers are arranged under a discharge port of the raw material buffer bin, the spherical crushing pair rollers are arranged under the pressing sheet pair rollers, the material screening machine is arranged under the spherical crushing pair rollers, an output shaft of the pressing sheet motor is fixedly connected with the pressing sheet pair rollers, the output shaft of the crushing pair roller motor is fixedly connected with the spherical crushing pair rollers to provide power for the spherical crushing pair rollers, an output end of the weighing sensor is connected with an input end of the central processing unit, and an output end of the central processing unit is respectively connected with a control input end of the pressing sheet motor, the crushing pair roller motor, the discharging valve and the material screening machine.

2. The automatic cubic boron nitride raw material granulation system according to claim 1, wherein: the vacuum feeding device is characterized by further comprising a first vacuum feeding machine and a vacuum feeding valve, wherein the first vacuum feeding machine is arranged between a discharge port of the mixer and a feed inlet of the raw material cache bin, the vacuum feeding valve is fixedly arranged at the discharge port of the vacuum feeding machine, and the control input end of the vacuum feeding machine is in control connection with the output end of the central processing unit.

3. The automatic cubic boron nitride raw material granulation system according to claim 1, wherein: the screening machine is a round double-layer screening machine and is used for screening materials with different sizes, so that unqualified materials are divided into coarse materials and fine powder.

4. The automatic cubic boron nitride raw material granulation system according to claim 3, wherein: the upper layer screen mesh of the round double-layer screen is 20 meshes, and the lower layer screen mesh is 100 meshes.

5. The automatic cubic boron nitride raw material granulation system according to claim 1, wherein: the feeding device is characterized by also comprising a feed back system, wherein the feed back system is used for collecting unqualified materials discharged from the material screening machine and conveying the unqualified materials to a feeding hopper of the forced feeding device for repeated production.

6. The automatic cubic boron nitride raw material granulation system according to claim 5, wherein: the feed back system comprises a coarse material recovery part for recovering large-particle materials obtained by the upper-layer screen and a fine powder recovery part for recovering fine powder materials obtained by the lower-layer screen.

7. The automatic cubic boron nitride raw material granulation system according to claim 6, wherein: the coarse fodder recovery part comprises a coarse fodder buffering bin and a spiral feeding machine, wherein a feeding hole of the coarse fodder buffering bin is communicated with a discharging hole of an upper-layer screen, a feeding hole of the spiral feeding machine is communicated with the coarse fodder buffering bin, and the discharging hole is communicated with a feeding hopper of a forced feeding device.

8. The automatic cubic boron nitride raw material granulation system according to claim 6, wherein: the fine powder recovery part comprises a fine powder buffer bin and a second vacuum feeding machine, a feed inlet of the fine powder buffer bin is communicated with a discharge outlet at the bottom of the lower-layer screen, a feed inlet of the second vacuum feeding machine is communicated with the fine powder buffer bin, and a discharge outlet is communicated with a feeding hopper of the forced feeding device.

9. An automatic cubic boron nitride raw material granulating system according to any one of claims 1 to 8, wherein: still including aggregate buffering storehouse and the feed bin of weighing, aggregate buffering storehouse set up directly over the feed bin of weighing, and the two intercommunication, the feed inlet in aggregate buffering storehouse and the aggregate discharge gate intercommunication of sieve machine, the discharge gate of the feed bin of weighing and packagine machine's feed inlet intercommunication.

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