CN111940092B - Supplementary coal sample grinder of static - Google Patents
Supplementary coal sample grinder of static Download PDFInfo
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- CN111940092B CN111940092B CN201910404475.XA CN201910404475A CN111940092B CN 111940092 B CN111940092 B CN 111940092B CN 201910404475 A CN201910404475 A CN 201910404475A CN 111940092 B CN111940092 B CN 111940092B
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- static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- Food Science & Technology (AREA)
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Abstract
The invention relates to an electrostatic auxiliary coal sample grinding device, which is characterized in that: the rack system support the whole device, the power and static control system can control the rotation state of the power system and the charge state carried by the static ring, the power system can rotate with the grinding cavity through the shaft drive upper end cover, the symmetrical axis of the grinding cavity does not coincide with the shaft rotation axis, the upper end cover is in threaded connection with the grinding cavity, the grinding cavity is made of an insulator, the lower inner wall is a hemisphere, the cooling system is arranged on the outer wall of the grinding cavity and can cool the grinding cavity, the static ring is arranged on the inner wall of the grinding cavity in parallel and can conduct static electricity generated by the power and static control system to sample powder, and the ground wire is connected with the power and static control system and can lead out redundant charges in time. The charges of the electrostatic ring are changed periodically, so that the charges of the coal sample are changed continuously, and the grinding efficiency is improved finally.
Description
Technical Field
The invention belongs to the field of coal analysis instruments, and particularly relates to an electrostatic auxiliary coal sample grinding device.
Background
In coal analysis, the pore size distribution of coal samples is an important research parameter. The low-temperature liquid nitrogen adsorption experiment is one of the important methods for measuring the pore size distribution of the coal sample. Due to the development of microcracks in the sample, the bulk is large and it is often necessary to crush the sample to speed up the assay. The method comprises the following specific steps: firstly, crushing a blocky or granular coal sample into a sample of 50 meshes to 250 meshes, then putting the sample into a low-temperature liquid nitrogen adsorption tester, and finally obtaining the pore size distribution of the coal sample by measuring the adsorption and desorption curves of nitrogen under different pressures and explaining the curves by using a BJH (BJH) or NLDFT (non-dispersive high-temperature Fourier transform) method. In the sample crushing process, the inner cavity of the existing sample grinding equipment is generally agglomerated due to gradual accumulation of static electricity, and the agglomerated sample powder is adhered to the wall surface of a grinding cavity or the wall surface of a grinding ball, so that the grinding efficiency is low. Therefore, the grinding process needs to be improved, and the improvement is of great significance to the improvement of the experiment progress.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electrostatic auxiliary coal sample grinding device, which utilizes static electricity to continuously gather and scatter sample powder and improve grinding efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides an auxiliary coal sample grinder of static, its structure includes rack system, power and static control system, driving system, axle, upper end cover, static ring, ball, grinding chamber, cooling system, ground wire, its characterized in that: the frame system supports the whole device, the power and static control system can control the rotation state of the power system and the charge state carried by the static ring, the power system can drive the upper end cover and the grinding cavity to rotate through a shaft, the upper end face of the shaft is not parallel to the lower end face of the shaft, the symmetry axis of the grinding cavity is not coincident with the rotation axis of the shaft, the upper end cover is in threaded connection with the grinding cavity, the grinding cavity is made of an insulating body, the inner wall of the lower portion of the grinding cavity is a hemisphere, the cooling system is arranged on the outer wall of the grinding cavity and can cool the grinding cavity, the static ring is arranged on the inner wall of the grinding cavity in parallel and can conduct static electricity generated by the power and static control system to sample powder, and the ground wire is connected with the power and static control system and can lead out redundant charge in time.
The power and static control system consists of two parts, namely a power system and a static control system. The power system is a motor which drives the grinding cavity to rotate, and the static control system is a static generator which controls the charges carried by the static ring. The cooling system is a technical scheme which can reduce the temperature by the prior known technology such as ice cubes or radiating fins.
The method comprises the following steps of grinding a sample by using a static auxiliary coal sample grinding device:
(1) powering off the grinding device, and placing the coal sample to be ground and the grinding balls in a low-temperature drying box for drying;
(2) taking out the dried coal sample to be ground and the grinding balls, placing the coal sample to be ground and the grinding balls into a grinding cavity, and rotatably connecting the grinding cavity with an upper end cover;
(3) the power and static control system is connected with a power supply and a ground wire, the static ring is connected, and after residual charges on the static ring are led out, the power and static control system disconnects the static ring from the ground wire;
(4) the power and static control system drives the power system to rotate, so that the grinding cavity eccentrically rotates to start grinding;
(5) the power and static control system controls all the static rings to be electrified according to the following sequence: meanwhile, the static ring is charged with positive charges, a ground wire is connected to enable the static ring to be uncharged, the static ring is charged with negative charges, and the state of the ground wire communicated with the static ring is controlled by a power and static control system;
(6) repeating the step (5) for a certain time, then closing the power system, switching on the ground wire to enable the electrostatic ring to be uncharged, powering off the grinding device, detaching the grinding cavity, putting the coal sample into a vibrating screen for screening, and pouring the coal sample with the particle size larger than the target particle size range back to the grinding cavity;
(7) and (5) repeating the steps (3) to (6) until the particle size of the coal sample meets the requirement, and finishing grinding the coal sample.
The design principle of the invention is as follows:
the coal sample can generate static electricity in the grinding process. Because the coal sample powder has small particle size and light particles, the aggregation state of the sample is greatly influenced by static electricity. The basic principle of this patent lies in through the static ring charged state of periodic change, and then constantly changes the electrostatic field that the coal sample was located, grinds with higher speed. When the coal-like particles are charged like the same polarity, the coal-like particles are mutually repelled, and when the coal-like particles are charged like the opposite polarity, the coal-like particles are mutually attracted, so that the agglomeration probability of the particles is reduced. The method comprises the steps of firstly enabling the static ring to be positively charged, basically enabling sample powder to be positively charged after the static ring is stabilized for a certain time, enabling the sample to be gathered and then dispersed, then grounding the static ring, enabling the static ring to be uncharged, and leading out the static electricity of the sample along with the ground line. The sample is gathered at the bottom of the grinding cavity under the action of gravity after being uncharged, then the electrostatic ring is charged negatively, the sample powder is basically charged negatively after being stabilized for a certain time, and the positive particles which are suspended in the cavity and are not ground in the previous step are neutralized by the negative particles and are attracted mutually without being charged and fall down. The electrostatic field which is changed periodically continuously enables the coal sample particles to be periodically gathered, dispersed and then gathered, and finally the purpose of accelerating the grinding efficiency of the grinding ball is achieved. And before the sample is taken out, redundant charges are led out through the grounding wire, so that the coal sample is prevented from floating around due to static electricity, and the powder is convenient to transfer. The cooling system prevents the sample, the grinding balls and the grinding chamber from causing damage to the sample due to excessive temperature during grinding.
The invention has the beneficial effects that:
the principle design shows that the static auxiliary coal sample grinding device provided by the invention is simple and convenient to operate, simple in technology and good in feasibility. The electrostatic field in the grinding cavity is continuously changed by continuously changing the charges on the electrostatic ring on the inner wall of the grinding cavity, so that the dispersion and aggregation of particles are accelerated, the particles suspended in the cavity are accelerated to sink due to electrostatic neutralization, and finally the grinding efficiency of the coal sample is accelerated.
Drawings
Fig. 1 is a schematic view of an electrostatic-assisted coal sample grinding apparatus according to embodiment 1 of the present invention, in which: the grinding machine comprises a machine frame system 1, a power and static control system 2, a power system 3, a shaft 4, an upper end cover 5, an electrostatic ring 6, a grinding ball 7, a grinding cavity 8, a cooling system 9 and a ground wire 10.
Detailed Description
Example 1
The utility model provides an auxiliary coal sample grinder of static, its structure includes rack system 1, power and static control system 2, power system 3, axle 4, upper end cover 5, static ring 6, ball 7, grinding chamber 8, cooling system 9, ground wire 10, its characterized in that: the rack system 1 supports the whole device, the power and static control system 2 can control the rotation state of the power system 3 and the charge state carried by the static ring 6, the power system 3 can drive the upper end cover 5 and the grinding cavity 8 to rotate through the shaft 4, the upper end surface and the lower end surface of the shaft 4 are not parallel, the symmetrical axis of the grinding cavity 8 is not coincident with the rotating axis of the shaft 4, the upper end cover 5 is connected with the grinding cavity 8 through threads, the grinding cavity 8 is made of an insulator, the inner wall of the lower part of the grinding cavity is a hemisphere, the cooling system 9 is arranged on the outer wall of the grinding cavity 8 and can cool the grinding cavity 8, the electrostatic ring 6 is arranged on the inner wall of the grinding cavity 8 in parallel and can conduct power to the sample powder and the static electricity generated by the electrostatic control system 2, the ground wire 10 is connected with the power and static control system 2, and can lead out redundant charges in time.
The undescribed parts of the present invention are the same as or implemented using prior art.
Claims (1)
1. The utility model provides an auxiliary coal sample grinder of static, its structure includes rack system (1), power and static control system (2), driving system (3), axle (4), upper end cover (5), static ring (6), ball (7), grinding chamber (8), cooling system (9), ground wire (10), its characterized in that: the grinding machine is characterized in that the rack system (1) supports the whole device, the power and static control system (2) can control the rotation state of the power system (3) and the charge state carried by the static ring (6), the power system (3) can drive the upper end cover (5) and the grinding cavity (8) to rotate through the shaft (4), the upper end face and the lower end face of the shaft (4) are not parallel, the symmetrical shaft of the grinding cavity (8) is not coincident with the rotating shaft of the shaft (4), the upper end cover (5) is in threaded connection with the grinding cavity (8), the grinding cavity (8) is made of an insulator, the inner wall of the lower part of the grinding cavity is a hemisphere, the cooling system (9) is arranged on the outer wall of the grinding cavity (8) and can cool the grinding cavity (8), the grinding ball (7) is positioned in the grinding cavity (8), the static ring (6) is arranged on the inner wall of the grinding cavity (8) in parallel, the static electricity generated by the power and static electricity control system (2) can be conducted to the sample powder, and the ground wire (10) is connected with the power and static electricity control system (2) and can lead out redundant charges in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910404475.XA CN111940092B (en) | 2019-05-16 | 2019-05-16 | Supplementary coal sample grinder of static |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910404475.XA CN111940092B (en) | 2019-05-16 | 2019-05-16 | Supplementary coal sample grinder of static |
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| CN111940092A CN111940092A (en) | 2020-11-17 |
| CN111940092B true CN111940092B (en) | 2022-05-13 |
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| CN201910404475.XA Active CN111940092B (en) | 2019-05-16 | 2019-05-16 | Supplementary coal sample grinder of static |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2049848A1 (en) * | 1970-10-10 | 1972-04-13 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Grinding process for vibratory mills |
| ITMO20040138A1 (en) * | 2004-05-28 | 2004-08-28 | Giorgio Berselli | CENTRIFUGAL MILL FOR THE GRINDING OF INCONERENT MATERIAL |
| DE102011050154A1 (en) * | 2011-05-06 | 2012-11-08 | Sanovia Ag | Method for changing structure of minerals, particularly for micronizing in device with rotors, involves electrostatically charging mineral grains, where mineral is exposed to dynamic impact or friction process in housing between baffles |
| CN203140078U (en) * | 2013-01-30 | 2013-08-21 | 成都齐达科技开发有限公司 | Dry ball mill |
| CN106475192A (en) * | 2015-08-26 | 2017-03-08 | 天津奥尔斯特矿业设备制造有限公司 | A kind of colliery ball mill with chiller |
| CN205308462U (en) * | 2015-11-28 | 2016-06-15 | 重庆市合川区金原食品有限公司 | Tilting rotational vibration grinds |
| CN106269139B (en) * | 2016-09-29 | 2018-07-06 | 西南科技大学 | A kind of method for improving airflow milling Particle Acceleration performance |
| CN106733062A (en) * | 2017-02-22 | 2017-05-31 | 沈阳农业大学 | Tubers powder electric field dispersal device |
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