CN112007737A - Crushing equipment - Google Patents

Abstract

The invention discloses crushing equipment. The crushing plant comprises: the air inlet pipe, the trapezoidal electrode pair group and the air separation pipe. Each trapezoidal electrode pair comprises two trapezoidal electrodes. One inclined plane of one trapezoid electrode of each trapezoid electrode pair is opposite to one inclined plane of the other trapezoid electrode to form a trapezoid groove with two open ends. The sectional area of the upper opening part of the trapezoid groove is larger than that of the lower opening part. The lower opening end of the air separation pipe is communicated with the upper opening part of the trapezoidal groove, and the lower opening part of the trapezoidal groove is communicated with one end of the air inlet pipe. When the crushing equipment is used for crushing the graphite raw ore, the high-pressure short pulse is applied to the graphite raw ore through the electrode pair, the principle of selective crushing of a target mineral and impurity mineral crystal interface is utilized, and the dissociated large-scale graphite flakes can be effectively and timely sorted out based on the difference of drag force in an airflow field caused by the difference of the flake graphite flake structures and the gangue particle shapes, so that the purpose of protecting the large-scale graphite flakes to the maximum extent is achieved.

Description

a crushing device

technical field

The invention relates to the field of high-voltage short-pulse crushing, in particular to a crushing device.

Background technique

Most of the existing graphite ore sorting adopts multi-stage grinding and multi-stage flotation. In the process from graphite raw ore to graphite concentrate, a ball mill or rod mill will be used for several times of grinding. These indiscriminate grinding processes can cause a large number of large graphite flakes to be damaged, reducing economic value.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a crushing device, which can effectively separate the large flake graphite in time, avoid overgrinding of the dissociated flake graphite, and achieve the purpose of protecting the large flake graphite to the greatest extent.

For achieving the above object, the present invention provides the following scheme:

A crushing equipment, the equipment comprises: an air inlet pipe, a plurality of trapezoidal electrode pairs and an air selection pipe; wherein,

Each of the trapezoidal electrode pairs includes two trapezoidal body electrodes; an inclined surface of one of the trapezoidal body electrodes of each of the trapezoidal electrode pairs is arranged opposite to an inclined surface of the other trapezoidal body electrode to form a two-end electrode. an open trapezoidal groove; the cross-sectional area of the upper opening of the trapezoidal groove is greater than the cross-sectional area of the lower opening;

The lower open end of the air selection pipe communicates with the upper opening of the trapezoidal groove, and the lower opening of the trapezoidal groove communicates with one end of the air inlet pipe.

Optionally, the trapezoidal body electrode is a right-angled trapezoidal body.

Optionally, the device further includes a fan, an air inlet is opened on the side wall of the air inlet duct, and the air outlet of the fan communicates with the air inlet of the air inlet duct.

Optionally, the equipment further includes a star-shaped unloader, the feeding port of the star-shaped unloader is in communication with the other end of the air inlet pipe, and the feeding port of the star-shaped unloader is located at the below the air inlet of the air inlet pipe.

Optionally, the device further includes a silo and a transverse screw feeding mechanism, and the transverse screw shaft of the transverse screw feeding mechanism penetrates the silo and extends into the air selection pipe.

Optionally, the device further includes a cyclone dust collector, and the feed port of the cyclone dust collector communicates with the upper open end of the air selection pipe.

Optionally, the upper overflow port of the cyclone is provided with a bag filter.

Optionally, the trapezoidal electrode pair includes a first trapezoidal electrode pair, a second trapezoidal electrode pair and a third trapezoidal electrode pair that are insulated from each other from top to bottom.

Optionally, the device further includes a pulse power supply, one of the trapezoidal electrode pair is connected to one of the pulse power supply, and the pulse voltage peak value of the pulse power supply connected to the first trapezoidal electrode pair is greater than that of the second trapezoidal electrode. The pulse voltage peak value of the pulse power supply connected to the second trapezoidal electrode pair is larger than the pulse voltage peak value of the pulse power source connected to the third trapezoidal electrode pair.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

The invention provides crushing equipment comprising: an air inlet pipe, a trapezoidal electrode pair group and an air selection pipe. Each trapezoidal electrode pair includes two trapezoidal body electrodes. In each trapezoidal electrode pair, one inclined surface of one trapezoidal body electrode is disposed in direct opposition to one inclined surface of the other trapezoidal body electrode to form a trapezoidal groove with both ends open. The cross-sectional area of the upper opening of the trapezoidal groove is larger than the cross-sectional area of the lower opening. The lower open end of the air selection pipe is communicated with the upper opening of the trapezoidal groove, and the lower opening of the trapezoidal groove is communicated with one end of the air inlet pipe. When the crushing equipment provided by the present invention is used to crush and sort the graphite ore, a high voltage short pulse is applied to the graphite ore through the electrode pair, and the principle of selective crushing of the crystal interface between the target mineral and the impurity mineral is used. The difference in the drag force in the airflow field caused by the difference in the shape of the stone particles can effectively and timely sort the dissociated large flake graphite, so as to achieve the purpose of protecting the large flake graphite to the greatest extent.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

FIG. 1 is a schematic structural diagram of a crushing device according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a crushing device that can timely and effectively sort out the dissociated large flake graphite, so as to achieve the purpose of protecting the large flake graphite to the greatest extent.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a crushing device according to an embodiment of the present invention. As shown in FIG. 1 , the equipment includes: an air inlet pipe 1 , a trapezoidal electrode pair group 2 and an air selection pipe 3 .

Each of the trapezoidal electrode pairs includes two trapezoidal body electrodes; an inclined surface of one of the trapezoidal body electrodes of each of the trapezoidal electrode pairs is arranged opposite to an inclined surface of the other trapezoidal body electrode, forming a two-end electrode. An open trapezoidal groove 4; the cross-sectional area of the upper opening of the trapezoidal groove 4 is larger than the cross-sectional area of the lower opening.

The lower open end of the air selection pipe 3 communicates with the upper opening of the trapezoidal groove 4 , and the lower opening of the trapezoidal groove 4 communicates with one end of the air inlet pipe 1 .

In this embodiment, the trapezoidal body electrode 2 is a right-angled trapezoidal body. The cross-sectional area of the upper opening of the trapezoidal groove 4 is equal to the cross-sectional area of the lower open end of the air selection pipe 3 , and the minimum distance between the two trapezoidal electrodes 2 located at the lower opening of the trapezoidal groove 4 is 5 mm to 10 mm.

As a preferred mode, the device further includes a fan 5 , an air inlet is opened on the side wall of the air inlet duct 1 , and the air outlet of the fan 5 communicates with the air inlet of the air inlet duct 1 .

In order to smoothly discharge the ore particles that have not been broken to the target fineness, the equipment further includes a star-shaped unloader 6, and the feeding port of the star-shaped unloader 6 is communicated with the other end of the air inlet pipe 1, And the feeding port of the star-shaped unloader 6 is located below the air inlet of the air inlet pipe 1 .

In order to realize automatic feeding, the equipment further includes a silo 7 and a transverse screw feeding mechanism 8 , and the transverse screw shaft of the transverse screw feeding mechanism penetrates the bottom of the silo 7 and extends into the air selection pipe 3 . In order to facilitate the control of the feeding speed, the horizontal screw feeding mechanism 8 in this embodiment is a frequency conversion controlled screw feeder.

Further, the equipment further includes a cyclone dust collector 9 , a pressure relief storage tank 10 and a pulse power supply 11 . Wherein, the feeding port of the cyclone 9 is communicated with the upper open end of the air selection pipe 3, and the upper overflow port of the cyclone 9 is provided with a bag filter. The feed port of the pressure relief storage box 10 is communicated with the discharge port of the cyclone dust collector 9 . The pulse power supply 11 is connected to the trapezoidal electrode pair. In practical applications, different high-voltage pulse power sources can be set for different sizes of crushing objects, high-voltage pulse power sources are selected for large particle sizes, and lower-voltage pulse power sources are selected for small particle sizes, so as to achieve better crushing effect.

In this embodiment, in order to achieve energy saving and controllable crushing particle size, the trapezoidal electrode pair includes a pulse power supply, a first trapezoidal electrode pair, a second trapezoidal electrode pair, and a third trapezoidal electrode pair that are insulated from each other from top to bottom. One of the trapezoidal electrode pairs is connected to one of the pulse power sources, and the pulse voltage peak value of the pulse power source connected to the first trapezoid electrode pair is greater than the pulse voltage peak value of the pulse power source connected to the second trapezoid electrode pair, which is the same as the pulse voltage peak value of the pulse power source connected to the second trapezoid electrode pair. The pulse voltage peak value of the pulse power supply connected to the second trapezoidal electrode pair is greater than the pulse voltage peak value of the pulse power source connected to the third trapezoidal electrode pair. The pulse voltage peak values of the three pulse power sources form three voltage gradients, and the range of the pulse voltage peak value is 80-230kV.

The working principle of the crushing equipment provided by the present invention is as follows:

A pair of high-voltage electrodes is installed in the middle of the vertical air separation tube. After the graphite ore enters the crushing area formed by the electrode pair, the high-voltage electrode will apply a high-voltage short pulse on the ore, and the rock will first break down, and the inside of the rock will form tiny small pulses. Discharge pilot, the voltage drop on the high-voltage electrode is small in this process, and the current in the loop is also relatively small. When the leader develops to the electrode pair, the plasma channel bridge connects the high and low voltage electrodes, and other small channels disappear, forming a main discharge channel, the voltage on the high voltage electrode drops rapidly, and the current in the loop increases rapidly. The energy stored on the high voltage electrodes is released into the plasma channel and heats the channel. The plasma channel expands with heat and does work on the surrounding rock mass. The thermal expansion coefficient and brittleness of the surrounding rock and graphite are different. When the stress exceeds the stress intensity of the rock, the rock is broken, while the graphite flakes have a certain toughness and are not broken, so the ore and the large flake graphite dissociate. During this process, the drag force generated by the air blowing at the bottom of the air inlet pipe by the fan overcomes the gravity, and moves the dissociated large flake graphite and crushed fine ore particles to the upper part of the air selection pipe, while the insufficiently crushed The large-size ore will continue to enter the lower high-pressure crushing zone due to its large gravity and continue to be crushed, and the particles that fail to be crushed eventually fall at the bottom of the air selection tube, thereby completing the selective crushing of the product.

The invention uses high-voltage short pulses to crush the graphite ore, which not only solves the problems of heavy equipment and low efficiency in the current graphite ore mechanical crushing and grinding technology, but also can selectively crush the graphite ore and move it out of the sorting area in time, which can better Protects large flake graphite. At the same time, the invention combines the high-pressure short-pulse crushing technology with the wind separation technology, shortens the process flow, and reduces the floor space of the equipment.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The principles and implementations of the present invention are described herein using specific examples. The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (9)

1. A crushing plant, characterized in that it comprises: the air inlet pipe, the plurality of trapezoidal electrode pairs and the air separation pipe; wherein,

each trapezoidal electrode pair comprises two trapezoidal electrode; one inclined plane of one trapezoid electrode of each trapezoid electrode pair is opposite to one inclined plane of the other trapezoid electrode to form a trapezoid groove with two open ends; the sectional area of the upper opening part of the trapezoid groove is larger than that of the lower opening part;

the lower opening part of the air separation pipe is communicated with the upper opening part of the trapezoidal groove, and the lower opening part of the trapezoidal groove is communicated with one end of the air inlet pipe.

2. The apparatus of claim 1, wherein the trapezoid electrodes are right angle trapezoids.

3. The equipment of claim 1, further comprising a fan, wherein an air inlet is formed in the side wall of the air inlet pipe, and an air outlet of the fan is communicated with the air inlet of the air inlet pipe.

4. The apparatus of claim 3, further comprising a star unloader, a feed port of said star unloader communicating with the other end of said air inlet duct, and a feed port of said star unloader positioned below said air inlet of said air inlet duct.

5. The apparatus of claim 1 further comprising a silo and a transverse screw feed mechanism having a transverse screw axis extending through the silo and into the air separation duct.

6. The apparatus of claim 5 further comprising a cyclone, the feed inlet of said cyclone being in communication with the open upper end of said air classification duct.

7. The apparatus as claimed in claim 6, wherein the upper overflow port of the cyclone is provided with a bag-type dust collector.

8. The apparatus of claim 1, wherein the trapezoidal electrode pair comprises a first trapezoidal electrode pair, a second trapezoidal electrode pair, and a third trapezoidal electrode pair that are insulated from each other from top to bottom.

9. The apparatus of claim 8, further comprising a pulse power source, one of said trapezoidal electrode pairs being connected to one of said pulse power sources, wherein a peak value of a pulse voltage of the pulse power source connected to said first trapezoidal electrode pair is greater than a peak value of a pulse voltage of the pulse power source connected to said second trapezoidal electrode pair, and wherein a peak value of a pulse voltage of the pulse power source connected to said second trapezoidal electrode pair is greater than a peak value of a pulse voltage of the pulse power source connected to said third trapezoidal electrode pair.

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