CN116078495A - Vertical nano sand mill, sand milling system and sand milling method thereof - Google Patents

Abstract

The invention relates to the technical field of material grinding, in particular to a vertical nano sand mill, a sand milling system and a sand milling method thereof. The outer wall of the polygonal rotor is matched with the inner wall of the polygonal grinding barrel, when the rotor rotates, besides radial stirring and grinding of the movable pin, as the grinding cavity between the rotor and the grinding barrel generates a severe rubbing effect in the grinding cavity due to repeated change of cavity capacity during working, the water cooling channels are respectively arranged on the supporting shaft, the outer wall of the grinding barrel and the inner part of the rotor, so that the phenomenon of overheat and adhesion of slurry is avoided, and the ultrasonic wave generating device generates a super cavitation effect while grinding is utilized, so that the efficiency can be greatly improved, and the energy consumption is reduced.

Description

Vertical nano sand mill, sand milling system and sand milling method thereof

Technical Field

The invention relates to the technical field of material grinding, in particular to nano-scale superfine grinding applied to inorganic mineral materials, metal oxides, ink coatings, foods or medicinal materials and the like, and particularly relates to a vertical nano-sand mill, a sand milling system and a sand milling method thereof.

Background

The traditional medium stirring mill and device comprise a vertical medium stirring mill and a device such as a vertical flaker, and the like, and as the vertical medium stirring mill, various defects are difficult to overcome all the time:

1. in the traditional vertical stirring mill, the original clinging state of the grinding medium in the grinding barrel is propped up and loosened by the lifting force of the slurry under the pressure of the high-pressure slurry supply pump during operation, so that the grinding medium and the grinding medium are separated from each other in the ground slurry to be in a suspension state, and the efficiency of the grinding medium and the grinding medium is greatly reduced under the condition of stirring and grinding.

2. The conventional vertical stirring mill generally uses a rotary shaft driving plate structure or a rotary shaft long pin rod structure, and even if the outer ring of the driving plate has reached a relatively high linear speed, the linear speed at the central part of the rotary shaft is still lower, so that only the part with the relatively high speed plays a role in efficient grinding, and the total grinding efficiency is not high.

3. In the traditional vertical stirring mill, because the shaft cannot be provided with an internal cooling mechanism and the volume of the grinding chamber is large, friction heat generation cannot be rapidly cooled, so that slurry is rapidly heated up when entering the grinding chamber, the viscosity of the slurry is improved, and the grinding efficiency is rapidly reduced.

4. For the reason of the first point, the conventional vertical agitator mill needs to reduce the concentration of the slurry to be ground in order to avoid the excessively high suspension effect of the grinding medium, so that the slurry easily penetrates the gap between the grinding medium and is not ground, and the concentration of the slurry to be ground is too low to cause less particles to contact the grinding medium, thus the efficiency is not high.

In summary, the traditional vertical stirring mill has the defects of low efficiency and high energy consumption.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a vertical nano sand mill, a sand milling system and a sand milling method thereof.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the vertical nano sand mill comprises a machine base, a grinding barrel, a supporting shaft and a rotor, wherein the grinding barrel is vertically fixed on the machine base, the rotor is rotatably arranged in the grinding barrel through the supporting shaft, the supporting shaft is vertically arranged, and the machine base is provided with a driving mechanism for driving the supporting shaft and the rotor to rotate; a grinding cavity is formed between the inner wall of the grinding barrel and the outer wall of the rotor, and the area of the grinding cavity along the circumferential direction is changed;

the circumference of the rotor is provided with a plurality of movable pin bars, the inner wall of the grinding barrel is provided with a plurality of static pin bars, the movable pin bars and the static pin bars are staggered in the circumferential direction, and the movable pin bars are provided with wedge-shaped surfaces which are inclined upwards;

the bottom side wall of the grinding barrel is provided with a slurry inlet pipe communicated with the grinding cavity, the top side wall of the grinding barrel is provided with a slurry outlet pipe communicated with the grinding cavity, and the bottom of the grinding barrel is provided with a bottom slurry pipe communicated with the bottom of the grinding cavity;

an ultrasonic generating device is arranged on the inner wall of the grinding barrel;

the supporting shaft, the outer wall of the grinding barrel and the interior of the rotor are respectively provided with a water cooling channel.

Specifically, the cross section of the inner wall of the grinding barrel and/or the outer wall of the rotor is polygonal.

Specifically, the inclination angle of the wedge-shaped surface of the movable pin rod can be adjusted.

Specifically, the supporting shaft is arranged in a hollow way, a water inlet pipe and a water outlet pipe are arranged between the supporting shaft in a penetrating way, the rotor is barrel-shaped, and the water inlet pipe of the supporting shaft, the inside of the rotor and the water outlet pipe of the supporting shaft are sequentially communicated to form the water cooling channel so as to flow cooling water therein.

Specifically, the outer wall of the grinding barrel is provided with a sleeve, the water cooling channel is enclosed between the sleeve and the outer wall of the grinding barrel, and the water cooling channel is provided with a water inlet and a water outlet.

Specifically, the driving mechanism comprises a motor, belt pulleys and a driving belt, wherein the two belt pulleys are respectively fixed on an output shaft and a supporting shaft of the motor, and the driving belt is wound outside the two belt pulleys.

The invention also provides a sanding system, which comprises the vertical nano sand mill, a slurry inlet mechanism, a slurry outlet mechanism and a cold water mechanism, wherein the cold water mechanism comprises a cold water machine and a cold water bucket, the cold water machine is communicated with the cold water bucket through a pipeline, the cold water bucket is communicated with the water inlet end of the water cooling channel through a pipeline and a cold water pump, and is communicated with the water outlet end of the water cooling channel through a backflow pipeline;

the pulp feeding mechanism comprises a pulp feeding pipe, a cold pulp pipe and a high-pressure pulp pump, wherein the pulp feeding pipe is communicated with the cold pulp pipe through the high-pressure pulp pump, a local section bending disc of the cold pulp pipe is arranged in a water cooling barrel, the cold pulp pipe is respectively communicated with the pulp feeding pipe and a bottom pulp pipe, the bottom pulp pipe is provided with an underflow regulating valve, and a jet flow mixer is arranged between the pulp feeding pipe and the cold pulp pipe;

the pulp outlet mechanism comprises a discharging pipeline, an ultrasonic vibration separating screen, a pulp grinding discharge pipe and a grinding medium lifting device, wherein the pulp outlet pipe is communicated with the ultrasonic vibration separating screen through the discharging pipeline, the pulp grinding discharge pipe is connected with the ultrasonic vibration separating screen to discharge ground materials, and the grinding medium separated by the ultrasonic vibration separating screen is conveyed to the jet mixer through the grinding medium lifting device.

Specifically, the jet mixer comprises a hollow shell, a nozzle connected with a cold slurry pipe is arranged at the upper end part of the shell, and a sand inlet channel for inputting grinding media is arranged on the side wall of the shell.

Specifically, the inner wall of the shell is provided with a wear-resistant layer.

The invention also provides a sanding method, which is applied to the sanding system and comprises the following steps:

the preparation steps are as follows: starting a cold water mechanism to prepare cooling water with the temperature below 30 ℃ to circularly operate in a water cooling channel;

and (3) a pulp feeding step: the slurry with 25-70% of solid content to be ground enters a cold slurry pipe under the pumping of a high-pressure slurry pump, is cooled by a cold water barrel, is mixed with a grinding medium by a jet mixer, enters a grinding cavity through a slurry inlet pipe under the pushing of the jet force and the dead weight of the slurry, and enters a bottom slurry pipe through a bypass pipe;

grinding: the slurry is stirred by a movable pin driven by a rotor and disturbed by a static pin in the grinding cavity, and the slurry is ground and slowly rises under the synergistic action of repeated pinching and extrusion of volume compression and relaxation of the grinding cavity and an ultrasonic generating device in combination with the change of the area of the grinding cavity along the circumferential direction;

discharging: the ground slurry and the grinding medium mixture are sent to an ultrasonic vibration separation sieve through a slurry outlet pipe, the separated grinding medium is lifted to a jet mixer through a grinding medium lifting device, and the ground slurry is discharged through a slurry outlet pipe.

The invention has the beneficial effects that:

compared with the prior art, the vertical nano sand mill, the sand milling system and the sand milling method thereof have the following advantages:

1. by utilizing the wedge-shaped surface chamfer with the upward inclination of the movable pin, the slurry and the grinding medium mixture are lifted upwards during stirring and grinding, the upward lifting of the slurry pressure is not needed, the situation that the grinding efficiency is greatly reduced due to the fact that the gap between the grinding medium and the grinding medium is increased due to the lifting force of the slurry in the traditional stirring mill is avoided, and the grinding medium can be closely attached to the slurry with higher concentration for grinding, so that the efficiency is greatly improved, and the energy consumption is reduced.

2. When the rotor rotates, the radial stirring and grinding of the movable pin are performed, and the grinding cavity between the rotor and the grinding barrel generates a severe rubbing effect in the grinding cavity due to the repeated change of the cavity capacity during the work, so that the grinding efficiency is greatly improved, especially in the case of high-concentration slurry;

3. the supporting shaft, the outer wall of the grinding barrel and the interior of the rotor are respectively provided with a water cooling channel, so that the phenomenon of overheat adhesion of slurry is avoided, and the efficiency is further improved.

4. The inner wall of the grinding barrel is provided with an ultrasonic generating device, and the ultrasonic generating device generates a super cavitation effect while grinding, so that the grinding efficiency is greatly improved.

5. The mode of using the ultrasonic vibration separating screen to separate the slurry medium outside the machine can separate thick slurry from fine grinding medium (sand), so that the solid content of the initial slurry to be ground can be improved, and the grinding efficiency is greatly improved.

Drawings

Fig. 1 is a schematic layout of a sanding system in an embodiment.

Fig. 2 is a schematic layout view of a vertical nano sand mill in an embodiment.

Fig. 3 is a partial enlarged view of fig. 2.

Fig. 4 is a schematic diagram of the fit of the grinding barrel and the rotor in the embodiment.

Fig. 5 is a schematic view of a motion bar in an embodiment.

Fig. 6 is a schematic structural diagram of a jet mixer in an embodiment.

Reference numerals:

the vertical nano sand mill comprises a vertical nano sand mill 1, a stand 11, a grinding barrel 12, a supporting shaft 13, a rotor 14, a driving mechanism 15, a motor 151, a belt pulley 152, a transmission belt 153, a grinding cavity 16, a movable pin 17, a static pin 18, a slurry inlet pipe 19, a slurry outlet pipe 110, a slurry outlet pipe 111, an ultrasonic wave transmitting rod 112, an ultrasonic wave transmitting plate 113, a sleeve 114, a water inlet 115, a water outlet 116 and an underflow regulating valve 117;

a pulp feeding mechanism 2, a pulp feeding pipe 21, a pulp cooling pipe 22 and a high-pressure pulp pump 23;

the pulp discharging mechanism 3, a discharging pipeline 31, an ultrasonic vibration separating screen 32, a pulp grinding discharge pipe 33 and a grinding medium lifting device 34;

a cold water mechanism 4, a cold water machine 41, a cold water bucket 42, a cold water pump 43 and a return pipeline 44;

jet mixer 5, housing 51, nozzle 52, sand inlet channel 53, wear-resistant layer 54.

Detailed Description

The present invention will be described in detail with reference to specific embodiments and drawings.

The sanding system of this embodiment, as shown in fig. 1, includes a vertical nano sand mill 1, and further includes a slurry inlet mechanism 2, a slurry outlet mechanism 3, and a cold water mechanism 4, wherein the vertical nano sand mill 1 is used as a core host, and the following details are set forth:

as shown in fig. 2 to 6, the vertical nano sand mill 1 comprises a base 11, a grinding barrel 12, a supporting shaft 13 and a rotor 14, wherein the grinding barrel 12 is vertically fixed on the base 11, the rotor 14 is rotatably arranged in the grinding barrel 12 through the supporting shaft 13, the supporting shaft 13 is vertically arranged and arranged through a bearing seat, the base 11 is provided with a driving mechanism 15 for driving the supporting shaft 13 and the rotor 14 to rotate, the driving mechanism 15 comprises a motor 151, a belt pulley 152 and a transmission belt 153, the motor 151 is fixed on the base 11, the two belt pulleys 152 are respectively fixed on an output shaft of the motor 151 and the supporting shaft 13, the transmission belt 153 is wound outside the two belt pulleys 152, and when in use, the motor 151 rotates to drive the belt pulley 152 and the transmission belt 153 to rotate, so that the supporting shaft 13 and the rotor 14 are driven to rotate.

In this embodiment, a plurality of movable pins 17 are disposed on the peripheral side of the rotor 14, a plurality of static pins 18 are disposed on the inner wall of the grinding barrel 12, the movable pins 17 and the static pins 18 are staggered in the circumferential direction, the movable pins 17 are provided with wedge faces inclined upwards, the wedge shapes can grind slurry in the grinding cavity 16 and lift the slurry without lifting the slurry, and the situation that the grinding efficiency is greatly reduced due to the fact that the gap between grinding media is enlarged due to the lifting force of the slurry in the traditional stirring mill is avoided. As shown in fig. 5, the upper two pins 17 and the lower two pins 17 illustrate the lifting direction of the slurry as the rotor 14 rotates about the direction a. The two middle movable pin bars 17 are provided with broken lines which indicate that the inclination angle of the wedge-shaped surface of the movable pin bars 17 can be adjusted, and the slurry lifting speed can be conveniently adjusted by adjusting the wedge-shaped cutting edge mounting angle through making the mounting root parts of the movable pin bars 17 into spline shafts and making the mounting holes of the rotor 14 into spline holes without changing the speed of the supporting shaft 13.

A grinding chamber 16 is formed between the inner wall of the grinding barrel 12 and the outer wall of the rotor 14, and the area of the grinding chamber 16 in the circumferential direction is varied. Specifically, the cross sections of the inner wall of the grinding barrel 12 and the outer wall of the rotor 14 are polygonal, so that when the rotor 14 rotates, grinding work is performed, besides stirring work of the movable pin 17, pinching work of the grinding cavity 16 is increased, and the work volume area is increased exponentially. In addition to the radial stirring grinding of the motion bar 17, the grinding efficiency is greatly improved due to the fact that the grinding cavity 16 between the rotor 14 and the grinding barrel 12 generates a severe kneading action in the grinding cavity 16 due to the repeated change of the cavity capacity during operation, especially in the case of high-concentration slurry.

The bottom side wall of the grinding barrel 12 is provided with a pulp inlet pipe 19 communicated with the grinding cavity 16, the top side wall of the grinding barrel 12 is provided with a pulp outlet pipe 110 communicated with the grinding cavity 16, the bottom of the grinding barrel 12 is provided with a bottom pulp pipe 111 communicated with the bottom of the grinding cavity 16, and the higher pressure pulp of the bottom pulp pipe 111 is reserved in order to prevent heavy sand media (grinding media) from entering the grinding barrel 12.

The inner wall of the grinding barrel 12 is provided with an ultrasonic generating device which comprises a part of the Chinese zodiac bar 18 as an ultrasonic transmitting bar 112, and the ultrasonic transmitting bar 112 is used for replacing the part of the Chinese zodiac bar 18 and an ultrasonic transmitting plate 113 is arranged on the inner plate surface of the grinding cavity 16, so that the grinding efficiency is greatly improved by utilizing the ultrasonic cavitation function and the cooperative mechanical grinding function.

The supporting shaft 13, the outer wall of the grinding drum 12 and the inside of the rotor 14 are respectively provided with water cooling passages. The water cooling channels of the three are specifically as follows: the supporting shaft 13 is arranged in a hollow way, a water inlet pipe and a water outlet pipe are arranged in a penetrating way, the water outlet pipe is sleeved outside the water inlet pipe, and an annular channel is formed between the outer wall of the water inlet pipe and the outer wall of the water outlet pipe to serve as a water outlet channel. The rotor 14 is barrel-shaped, the water inlet pipe of the supporting shaft 13, the inside of the rotor 14 and the water outlet pipe of the supporting shaft 13 are sequentially communicated to form two water cooling channels, as shown by arrows in fig. 2, cooling water flows in the water cooling channels, one water cooling channel is aimed at the supporting shaft 13, the other water cooling channel is aimed at the rotor 14, so that the cooling water in the inner cavity of the rotor 14 of the mill is circulated, the cooling water flows downwards from the upper end of the water inlet pipe and enters the inside of the rotor 14, and then flows upwards from the water outlet pipe to form circulation, thereby increasing an internal cooling system compared with a traditional mill, improving cooling efficiency and solving the problem that the grinding speed has to be reduced due to temperature rise. The rotor 14 is made into a barrel-shaped hollow form, cooling water enters the rotor 14 through a hollow sleeve inner channel of the supporting shaft 13, and is discharged from a gap between the hollow wall of the supporting shaft 13 and the sleeve outer diameter after cooling the rotor 14 absorbing heat from slurry, so that the phenomenon of overheat adhesion of slurry is avoided.

The outer wall of the grinding barrel 12 is provided with a sleeve 114, and a third water cooling channel is enclosed between the sleeve 114 and the outer wall of the grinding barrel 12, and is provided with a water inlet 115 and a water outlet 116. By designing the three cooling systems, the grinding heat of the slurry is fully taken away and the temperature of the slurry entering the slurry is reduced, so that the problem of grinding failure caused by Wen Shengnian medium of the slurry due to severe grinding is solved.

In this embodiment, the water chiller 41 includes a water chiller 41 and a water chiller 42, the water chiller 41 is connected to the water chiller 42 through a pipe, the water chiller 42 is connected to the water inlet end of the water cooling channel (the upper end of the support shaft 13 and the water inlet 115 of the sleeve 114) through a pipe and the water pump 43, and is connected to the water outlet end of the water cooling channel (the upper end of the water outlet pipe in the middle of the support shaft 13 and the water outlet 116 of the sleeve 114) through a return pipe 44.

The pulp feeding mechanism 2 comprises a pulp feeding pipe 21, a pulp cooling pipe 22 and a high-pressure pulp pump 23, wherein the pulp feeding pipe 21 is communicated with the pulp cooling pipe 22 through the high-pressure pulp pump 23, a partial section bending disc of the pulp cooling pipe 22 is arranged in a water cooling barrel, the pulp cooling pipe 22 is respectively communicated with a pulp feeding pipe 19 and a bottom pulp pipe 111, the bottom pulp pipe 111 is provided with an underflow regulating valve 117, and a jet mixer 5 is arranged between the pulp feeding pipe 19 and the pulp cooling pipe 22. The high-pressure slurry pump 23 pumps the slurry into a disk-shaped cold slurry pipe 22 in a cooling water bucket, and the ground slurry is cooled by cold water in a cold water bucket 42 firstly and then sent to a jet mixer 5 to be mixed with sand media.

The pulp discharging mechanism 3 comprises a discharging pipeline 31, an ultrasonic vibration separating screen 32, a pulp grinding discharge pipe 33 and a pulp grinding lifting device 34, wherein the pulp discharging pipe 110 is communicated with the ultrasonic vibration separating screen 32 through the discharging pipeline 31, the pulp grinding discharge pipe 33 is connected with the ultrasonic vibration separating screen 32 to discharge ground materials, and the pulp grinding separated by the ultrasonic vibration separating screen 32 is conveyed to the jet mixer 5 through the pulp grinding lifting device 34. The cooled slurry generates back suction force through high-speed jet flow, and after sand medium provided by the grinding medium lifting device 34 is sucked into the jet flow mixer 5, the slurry inlet pipe 19 entering the grinding barrel 12 under the action of jet flow force is lifted and ground by the rotor 14. The grinding medium lifting device 34 is a screw feeder.

By using the ultrasonic vibration separating screen 32 to perform efficient separation of pulp medium, the problem that the top purse net of the grinding barrel 12 for the traditional grinding machine is difficult to separate and the solid content of pulp must be reduced to facilitate separation is solved. While as slurry concentration increases, more particles to be ground participate in the grinding, thereby improving efficiency. The improvement of the design solves the defect that the traditional stirring mill cannot grind high-concentration slurry, can greatly widen the range of various high-concentration products covered by the mill and reduces the procedures of reducing the water content of the slurry after the slurry is ground. It should be noted that the ultrasonic vibration separation screen 32 is an existing outsourcing component, and the principle is to separate slurry and grinding medium (sand medium) by vibration of the vibration screen.

Specifically, the jet mixer 5 includes a hollow housing 51, a nozzle 52 connected to the cold slurry pipe 22 is disposed at an upper end of the housing 51, a sand inlet channel 53 for inputting grinding media is disposed on a side wall of the housing 51, the nozzle 52 sprays slurry, and the sand inlet channel 53 simultaneously inputs sand media (i.e. grinding media), so that the slurry and the sand media are mixed, and the jet mixer 5 solves the problem of continuous mixing in proportion. The inner wall of the housing 51 is provided with a wear layer 54 to improve the wear resistance of the pipe and to extend the service life.

The embodiment also provides a sanding method, which is applied to the sanding system and comprises the following steps:

the preparation steps are as follows: starting a cold water mechanism 4, and preparing cooling water with the temperature below 30 ℃ (preferably below 15 ℃) to circularly operate in three water cooling channels; cold water manufactured by the cold water machine 41 enters the cold water bucket 42, enters the main machine through the cold water pump 43 to the three cooling channels to cool and take away grinding heat, and then flows back to the main machine to complete the cooling cycle;

and (3) a pulp feeding step: the slurry with 25 to 70 percent of solid content to be ground enters a cold slurry pipe 22 under the pumping of a high-pressure slurry pump 23 and is cooled by a cold water barrel 42, is mixed with grinding media through a jet mixer, enters a grinding cavity 16 through a slurry inlet pipe 19 under the pushing of the jet force and the self weight of the slurry, and the other part of slurry enters a bottom slurry pipe 111 through a bypass pipe;

grinding: the slurry is stirred by a movable pin 17 and a static pin 18 driven by a rotor 14 in a grinding cavity 16, and the slurry is ground and slowly rises by combining the repeated pinching and extrusion of volume compression and relaxation of the grinding cavity 16 and the synergistic action of an ultrasonic generating device; the particles of the sand medium and the slurry are subjected to intense shearing, collision grinding and super cavitation bubble burst impact to finish high-efficiency grinding and refining processing;

discharging: the ground slurry and the grinding medium mixture are sent to an ultrasonic vibration separating screen 32 through a slurry outlet pipe 110, the separated grinding medium is lifted to a jet mixer 5 through a grinding medium lifting device 34 to be mixed with new slurry, so that the grinding medium circulation is completed, and the ground slurry is discharged to a pulping tank through a pulping discharge pipe 33 to enter the next process.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Standard parts used in the invention can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the details are not described.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A vertical nanometer sand mill is characterized in that: the grinding machine comprises a machine base, a grinding barrel, a supporting shaft and a rotor, wherein the grinding barrel is vertically fixed on the machine base, the rotor is rotatably arranged in the grinding barrel through the supporting shaft, the supporting shaft is vertically arranged, and the machine base is provided with a driving mechanism for driving the supporting shaft and the rotor to rotate; a grinding cavity is formed between the inner wall of the grinding barrel and the outer wall of the rotor, and the area of the grinding cavity along the circumferential direction is changed;

the circumference of the rotor is provided with a plurality of movable pin bars, the inner wall of the grinding barrel is provided with a plurality of static pin bars, the movable pin bars and the static pin bars are staggered in the circumferential direction, and the movable pin bars are provided with wedge-shaped surfaces which are inclined upwards;

the bottom side wall of the grinding barrel is provided with a slurry inlet pipe communicated with the grinding cavity, the top side wall of the grinding barrel is provided with a slurry outlet pipe communicated with the grinding cavity, and the bottom of the grinding barrel is provided with a bottom slurry pipe communicated with the bottom of the grinding cavity;

an ultrasonic generating device is arranged on the inner wall of the grinding barrel;

the supporting shaft, the outer wall of the grinding barrel and the interior of the rotor are respectively provided with a water cooling channel.

2. The vertical nano sand mill according to claim 1, wherein: the cross section of the inner wall of the grinding barrel and/or the outer wall of the rotor is polygonal.

3. The vertical nano sand mill according to claim 1, wherein: the inclination angle of the wedge-shaped surface of the movable pin rod can be adjusted.

4. The vertical nano sand mill according to claim 1, wherein: the supporting shaft is arranged in a hollow way, a water inlet pipe and a water outlet pipe are arranged between the supporting shaft in a penetrating way, the rotor is barrel-shaped, and the water inlet pipe of the supporting shaft, the inside of the rotor and the water outlet pipe of the supporting shaft are sequentially communicated to form the water cooling channel so as to flow cooling water therein.

5. The vertical nano sand mill according to claim 1, wherein: the outer wall of the grinding barrel is provided with a sleeve, the water cooling channel is enclosed between the sleeve and the outer wall of the grinding barrel, and the water cooling channel is provided with a water inlet and a water outlet.

6. The vertical nano sand mill according to claim 1, wherein: the driving mechanism comprises a motor, belt pulleys and a driving belt, the two belt pulleys are respectively fixed on an output shaft and a supporting shaft of the motor, and the driving belt is wound outside the two belt pulleys.

7. A sanding system characterized by: the vertical nano sand mill comprises the vertical nano sand mill according to any one of claims 1 to 6, and further comprises a slurry inlet mechanism, a slurry outlet mechanism and a cold water mechanism, wherein the cold water mechanism comprises a cold water machine and a cold water bucket, the cold water machine is communicated with the cold water bucket through a pipeline, the cold water bucket is communicated with the water inlet end of the water cooling channel through a pipeline and a cold water pump, and is communicated with the water outlet end of the water cooling channel through a backflow pipeline;

the pulp feeding mechanism comprises a pulp feeding pipe, a cold pulp pipe and a high-pressure pulp pump, wherein the pulp feeding pipe is communicated with the cold pulp pipe through the high-pressure pulp pump, a local section bending disc of the cold pulp pipe is arranged in a water cooling barrel, the cold pulp pipe is respectively communicated with the pulp feeding pipe and a bottom pulp pipe, the bottom pulp pipe is provided with an underflow regulating valve, and a jet flow mixer is arranged between the pulp feeding pipe and the cold pulp pipe;

the pulp outlet mechanism comprises a discharging pipeline, an ultrasonic vibration separating screen, a pulp grinding discharge pipe and a grinding medium lifting device, wherein the pulp outlet pipe is communicated with the ultrasonic vibration separating screen through the discharging pipeline, the pulp grinding discharge pipe is connected with the ultrasonic vibration separating screen to discharge ground materials, and the grinding medium separated by the ultrasonic vibration separating screen is conveyed to the jet mixer through the grinding medium lifting device.

8. A sanding system as defined in claim 7, wherein: the jet mixer comprises a hollow shell, a nozzle connected with a cold slurry pipe is arranged at the upper end part of the shell, and a sand inlet channel for inputting grinding media is arranged on the side wall of the shell.

9. A sanding system as defined in claim 8, wherein: the inner wall of the shell is provided with a wear-resistant layer.

10. The sanding method is characterized in that: use of a sanding system as defined in any one of claims 7 to 9, comprising the steps of:

the preparation steps are as follows: starting a cold water mechanism to prepare cooling water with the temperature below 30 ℃ to circularly operate in a water cooling channel;

and (3) a pulp feeding step: the slurry with 25-70% of solid content to be ground enters a cold slurry pipe under the pumping of a high-pressure slurry pump, is cooled by a cold water barrel, is mixed with a grinding medium by a jet mixer, enters a grinding cavity through a slurry inlet pipe under the pushing of the jet force and the dead weight of the slurry, and enters a bottom slurry pipe through a bypass pipe;

grinding: the slurry is stirred by a movable pin driven by a rotor and disturbed by a static pin in the grinding cavity, and the slurry is ground and slowly rises under the synergistic action of repeated pinching and extrusion of volume compression and relaxation of the grinding cavity and an ultrasonic generating device in combination with the change of the area of the grinding cavity along the circumferential direction;

discharging: the ground slurry and the grinding medium mixture are sent to an ultrasonic vibration separation sieve through a slurry outlet pipe, the separated grinding medium is lifted to a jet mixer through a grinding medium lifting device, and the ground slurry is discharged through a slurry outlet pipe.

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