CN111346465B - Electromechanical engineering workshop environmental protection dust collector - Google Patents
Electromechanical engineering workshop environmental protection dust collector Download PDFInfo
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- CN111346465B CN111346465B CN202010198719.6A CN202010198719A CN111346465B CN 111346465 B CN111346465 B CN 111346465B CN 202010198719 A CN202010198719 A CN 202010198719A CN 111346465 B CN111346465 B CN 111346465B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
Abstract
The invention provides an environment-friendly dust removal device for an electromechanical engineering workshop, which utilizes a disc-shaped filter to remove dust, and can ensure that the air flow is larger, thereby improving the dust removal efficiency; the lower filtering structure forms a water film structure by using centrifugal force to perform first filtering, and the upper filtering net structure is used to perform second filtering, so that the humidity of the discharged air after dust removal can be ensured; and the lower layer filter structure and/or the upper layer filter screen structure are cleaned by using a telescopic water pipe and a water quantity controller.
Description
Technical Field
The invention relates to the technical field of environmental protection and dust removal of engineering workshops, in particular to an environmental protection and dust removal device for an electromechanical engineering workshop.
Background
In the industrial production process, a large amount of high-temperature dust-containing gas needs dust removal and purification treatment, for example, valuable particulate matters contained in smelting gas need to be recovered under the high-temperature condition, or high-temperature dust removal is needed in the technological process, and for example, polluted dust in electromechanical workshops related to the battery industry is mainly toxic heavy metal and toxic graphite dust, and a dust removal system needs to be configured in a production workshop similar to the battery industry so as to reach the national occupational safety and health standards and environmental standards, so that physical damage and social environment pollution caused by front-line staff are avoided. The production workshop is a closed large workshop generally, and comprises one or more small and medium workshops which are communicated with each other to form a closed large space isolated from the outside. The dust removal system generally comprises an air exhaust unit for exhausting toxic gas, then the toxic gas is dedusted by a dust removal unit, and the dedusted clean gas is sent back to the workshop through an air supply unit.
For example, patent document CN105771486A describes a centrifugal dust removing device, which removes dust by the cooperation of centrifugal force and water flow, but the air speed in the air inlet cylinder cannot be too high, otherwise the dust removing effect of the centrifugal dust removing device cannot meet the national standards of occupational safety and health and environmental protection, so that the device has poor dust removing effect, extremely low dust removing efficiency, and excessive humidity of the discharged air. Patent document CN108816533A discloses an air dust removing device, which removes dust by using a plurality of structures such as a filter box and a dust removing box, the device structure is very complicated, and is not favorable for cleaning the dust removing device, and the exhausted air is too dry.
Therefore, it is imperative to design a dust removal device which has better dust removal effect and simple device structure, can ensure air humidity and can be convenient for cleaning.
Disclosure of Invention
Based on solving the problems, the invention provides an environment-friendly dust removal device for an electromechanical engineering workshop, which comprises a filter, a wastewater recovery tank and a gas cleaning chamber; wherein:
the gas cleaning chamber comprises a lower shell and an upper shell, the lower shell comprises a first gas transmission chamber and a liquid recovery chamber, and the upper shell comprises a second gas transmission chamber; the first air transmission chamber and the second air transmission chamber are cylindrical with the same bottom surface and are arranged up and down correspondingly; in addition, the first air transmission chamber and the second air transmission chamber have a space therebetween, and the space forms an annular opening;
the liquid recovery chamber surrounds the first gas transmission chamber, and the liquid recovery chamber and the first gas transmission chamber are separated by a partition plate;
the liquid recovery chamber is communicated with the wastewater recovery tank through a first connecting pipe;
providing the filter at the spacing, the filter being circular in plan view, concentrically with the cylinder, and having a radius greater than a radius of the bottom surface such that the filter extends through the annular opening to the liquid recovery chamber;
the filter comprises a lower layer filtering structure and an upper layer filtering net structure, wherein the lower layer filtering structure and the upper layer filtering net structure are disc-shaped structures which have the same size and are concentrically arranged; the lower layer filter structure comprises a first opening at the center thereof, a plurality of first connecting ribs with radial centers and grids among the first connecting ribs; the upper filter screen structure comprises a second opening in the center of the upper filter screen structure, a plurality of second connecting ribs radiating from the center of the upper filter screen structure and a filter screen extending from the second opening to the edge of the upper filter screen structure; the lower-layer filtering structure and the upper-layer filter screen structure are vertically separated by a certain distance, the first connecting ribs and the second connecting ribs vertically correspond to each other and are connected through a plurality of connecting columns, so that the lower-layer filtering structure and the upper-layer filter screen structure are fixed;
a rotating shaft connected with a motor is clamped in the first opening to drive the filter to rotate centrifugally, and the motor is positioned at the bottom of the gas cleaning chamber; the top of gaseous clean room has a scalable water pipe of connecting outside water source, works as when the water pipe extends to longest length, the water pipe passes second gas transmission room and follow the second opening inserts to between lower floor's filtration and the upper filter screen structure, and the water pipe has the mouth that sprays at its bottom, it is located to spray the mouth between lower floor's filtration and the upper filter screen structure.
According to an embodiment of the invention, the lower filter structure further comprises an annular platform surrounding the first opening, the annular platform being a gas-impermeable, water-impermeable sheet metal, which is integrally formed with the first connecting rib, and the grid being arranged between the first connecting rib and the annular platform.
According to the embodiment of the invention, when the dust removal operation is carried out, the water sprayed from the spraying openings directly falls to the annular platform part, and the sprayed water forms the water film filtering layer on the grid through the centrifugal force.
According to an embodiment of the invention, the interstices of the sieve are smaller than the interstices of the grid.
According to the embodiment of the invention, a water quantity controller is arranged between the water pipe and the external water source and used for controlling the flow rate of water in the water pipe so as to control the spraying water quantity and the spraying distance of the spraying opening.
According to the embodiment of the invention, the water outlet angle of the spraying openings is adjustable, so that at least the water sprayed out of the spraying openings can be sprayed onto the upper filter screen structure in a cleaning state.
According to an embodiment of the present invention, the upper filter screen structure further comprises a brush disposed at the edge, and the brush is used for brushing away the waste liquid on the wall of the liquid recovery chamber.
According to the embodiment of the invention, the bottom of the first gas transmission chamber is connected with a second connecting pipe communicated with the wastewater recovery tank.
According to an embodiment of the invention, the first gas transmission chamber is connected to a gas inlet pipe, and the gas inlet pipe is connected to an external gas extraction device.
According to the embodiment of the invention, the second gas transmission chamber is connected with a gas outlet pipe; the air-extracting device inputs the air to be dedusted into the first air transmission chamber through the air inlet pipe, then reaches the second air transmission chamber through the filter, and outputs the air through the air outlet pipe.
The invention utilizes the disc-shaped filter to remove dust, and can ensure that the air flow is larger, thereby improving the dust removal efficiency; the lower filtering structure forms a water film structure by using centrifugal force to perform first filtering, and the upper filtering net structure is used to perform second filtering, so that the humidity of the discharged air after dust removal can be ensured; and the lower layer filter structure and/or the upper layer filter screen structure are cleaned by using a telescopic water pipe and a water quantity controller.
Drawings
FIG. 1 is a cross-sectional view of an electro-mechanical engineering shop environment-friendly dust removal device of the present invention;
FIG. 2 is a cross-sectional view of a filter of the present invention;
FIG. 3 is a top view of the upper screen structure of the present invention;
figure 4 is a top view of the lower filter structure 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses an environment-friendly dust removal device for an electromechanical engineering workshop, and aims to solve the problems of low dust removal efficiency, inconvenience in cleaning, complex structure and high cost in the prior art.
Fig. 1 is a sectional view of an electro-mechanical engineering workshop environment-friendly dust removing device according to the present invention, and fig. 2 is a sectional view of a filter according to the present invention. As shown in fig. 1 and 2, the environment-friendly dust removal device for the electromechanical engineering workshop comprises a filter 3, a wastewater recovery tank 4 and a gas cleaning chamber.
The gas cleaning chamber includes a lower housing 2 and an upper housing 1. The lower shell 2 and the upper shell 1 are made of the same metal steel, and can be of an integrally formed structure or a split structure so as to be convenient to disassemble and overhaul. The gas cleaning chamber has a vertical structure as a whole, wherein the upper housing 1 is butted against the lower housing 2, and the upper housing 1 and the lower housing 2 are both cylindrical structures, but the radius of the bottom surface of the lower housing 2 is larger than that of the upper housing 1, whereby the gas cleaning chamber takes a shape that is slim in the upper part and fattened in the lower part.
Referring to fig. 1, the lower case 2 includes a first gas transmission chamber 14 and a liquid recovery chamber 15, and the lower case 2 includes a second gas transmission chamber 16. The first air transmission chamber 14 and the second air transmission chamber 16 are cylindrical with the same bottom surface and are arranged up and down correspondingly, but a space is formed between the first air transmission chamber 15 and the second air transmission chamber 16, and the space forms an annular opening. This annular opening is close to the height dimension of the filter 3 so that the filter 3 can be inserted into the annular opening. The liquid recovery chamber 15 surrounds the first gas transmission chamber 14, and the liquid recovery chamber 15 is separated from the first gas transmission chamber 14 by a partition plate 13. The partition plate 13 may be integrally formed with the lower case 2, and may be made of the same material as the lower case 2.
The bottom of the first gas transmission chamber 14 is provided with a connecting pipe 12 communicated with the waste liquid recovery tank 4, and the gas inlet pipe 5 is also communicated with the first gas transmission chamber 14. The connection pipe 12 is provided to prevent water stored in the first air transmission chamber 14 from flowing into the waste liquid recovery tank 4 to block the air inlet pipe 5, and to prevent excessive air humidity. The inlet pipe 5 is connected to an external suction device (not shown).
The liquid recovery chamber 15 is used for recovering the dust removing liquid generated by the filter 3, and the dust removing liquid falls into the liquid recovery chamber 15 from the edge of the filter 3. The liquid recovery chamber 15 is communicated with the wastewater recovery tank 4 through a connecting pipe 11. The wastewater recovery tank 4 is in a closed state when dust is removed, so that the flow direction of air is ensured. And the wastewater recovery tank 4 has a collection port (not shown) for wastewater disposal at a fixed time.
The filter 3 has a disk-like structure, which is circular in plan view, is provided at the space between the first air transmission chamber 14 and the second air transmission chamber 16, is concentrically provided with the lower casing 2 and the upper casing 1, and has a bottom surface having a radius larger than those of the first air transmission chamber 14 and the second air transmission chamber 15 so that the filter 3 extends to the waste liquid recovery chamber 15 through the annular opening. In addition, the radius of the bottom surface of the filter 3 is smaller than that of the bottom surface of the lower housing 2, that is, the radius of the bottom surface of the filter 3 is between that of the bottom surface of the lower housing 2 and that of the first air transmission chamber 14.
Referring to fig. 2, the filter 3 includes an upper filter screen structure 31 and a lower filter structure 32, the upper filter screen structure 31 and the lower filter structure 32 are both disc-shaped structures with the same size and concentrically arranged, and the upper filter screen structure 31 and the lower filter structure 32 are fixedly connected through a plurality of connecting columns 36 to realize synchronous rotation.
Referring to fig. 3, the upper screen structure 31 includes a second opening 33 at the center thereof, a plurality of second connection ribs 34 radiating from the center, and a screen 37 extending from the second opening 33 to the edge thereof. The number of the second connecting ribs 34 is multiple, for example, 4 in fig. 3, and the connecting posts 36 are all connected to the second connecting ribs 34. The screen 37 is disposed between the second connecting ribs 34, and has a small gap to filter dust. The upper filter screen structure 31 further comprises a brush 35 disposed at the edge, and the brush 35 is used for brushing away the waste liquid on the wall of the liquid recovery chamber 15. The brush 35 may be a plurality of discrete structures, or may surround the edge for a circle, and the brush 35 may be disposed on the top edge of the upper filter screen structure 31, or may be disposed on the extension of the edge of the upper filter screen structure 31.
Referring to fig. 4, the lower filter structure 32 includes a first opening 38 at its center, a plurality of first radial connector ribs 39, and a grid 42 between the first connector ribs 39. The lower filtering structure further comprises an annular platform part 40 surrounding the first opening, the annular platform part 40 is a metal thin plate which is air-tight and water-tight, and is integrally formed with the first connecting rib 39, and the grid 42 is arranged between the first connecting rib 39 and the annular platform part 40. The number of the first connecting ribs 39 is the same as that of the second connecting ribs 34, the first connecting ribs 39 are arranged vertically and correspondingly, and the connecting columns 36 are also connected with the first connecting ribs 39.
Lower floor's filtration 32 and upper filter screen structure 31 separate certain distance from top to bottom, first splice bar 34 corresponds from top to bottom and passes through with second splice bar 39 a plurality of spliced poles 36 will first splice bar 34 is connected with second splice bar 39, in order to realize lower floor's filtration 32 and upper filter screen structure 31 are fixed. The gaps of the filter screen 37 are smaller than those of the grid 42, and this arrangement is because the grid 42 needs to use centrifugal water to form a water film for the first filtration, and the larger gaps can achieve the dust removal operation on the basis of ensuring the air flow rate. And the filter screen 37 is used for the second filtration, which is mainly used for dust removal again to ensure the dust removal quality. And a space with more water vapor can be formed between the lower filter structure 32 and the upper filter screen structure 31 to ensure that the dust is wrapped and removed by the moisture.
A motor 9 is arranged below the first air transmission chamber 14, the motor 9 is connected with a rotating shaft 10, and the rotating shaft 10 is clamped in the first opening 38 to drive the filter 3 to realize centrifugal rotation. The top of the gas cleaning chamber has a retractable water pipe 8 connected to an external water source (not shown), and when the water pipe 8 is extended to the longest length, the water pipe 8 passes through the second gas transmission chamber 16 and is inserted between the lower filter structure 32 and the upper filter structure 31 from the second opening 33, and the water pipe 9 has a shower opening 17 at the bottom thereof, and the shower opening 17 is located between the lower filter structure 32 and the upper filter structure 31, see fig. 1. The water outlet angle of the spray opening 17 is adjustable, which at least can make the water sprayed out from the spray opening 17 spray on the upper filter screen structure 31 in a cleaning state. In addition, when the dust removing operation is performed, the water sprayed from the spray port 17 directly falls on the annular terrace portion 40, and the sprayed water forms a water film filter layer on the grid 42 by the centrifugal force. If the lower filter structure 32 is not provided with the annular platform 40, the water sprayed from the spray openings 17 will directly reach the grid 42, and a large part of the water may directly fall into the first air transmission chamber 14 and cannot form the water film filter layer.
A water quantity controller 7 is arranged between the water pipe 8 and the external water source and used for controlling the flow velocity of water flow in the water pipe 8 so as to control the spraying water quantity and the spraying distance of the spraying opening 7. In addition, the second air delivery chamber 16 is connected with the air outlet pipe 6; the air to be dedusted is input into the first air transmission chamber 14 through the air inlet pipe 5, then reaches the second air transmission chamber 16 through the filter 3, and is output as clean air through the air outlet pipe 6 by the air extracting device.
Specific uses include dust removal operations and self-cleaning operations. The dust removal operation includes: first stretch into the bottom of water pipe 8 extremely upper filter screen structure 31 with between the lower floor's filtration 32, and via spray 17 and spray water, then the adjustment sprays the play water angle of a mouthful 17 so that spun water falls extremely on annular platform portion 40, opens motor 9 afterwards and makes pivot 10 drives filter 3 and rotates, and makes form the water film filter layer by centrifugal force on the graticule mesh 42, then open air exhaust device and carry the gas that needs to purify extremely filter 3, through the double-deck filtration air-purifying of water film filter layer and filter screen 37 just with the waste liquid discharge extremely liquid recovery room 15 to by 6 output clean air of outlet duct. Further, the self-cleaning operation includes: close air exhaust device, motor 9 drives filter 3 rotates, makes scalable water pipe 8 is flexible from top to bottom to increase the discharge of water pipe 8, spray a mouthful 17 angle and also can swing from top to bottom in order to wash upper filter screen structure 31 with lower floor's isolating structure 32, its waste liquid also arranges extremely liquid recovery room 15, and spray a mouthful 17 spun water this moment and can not directly arrive on the annular platform portion 40.
In the invention, the water pipe 8, the filter 3 and the first air transmission chamber 14 are arranged in sequence from top to bottom in the vertical direction, wherein the second air transmission chamber 16 is arranged above the first air transmission chamber 14, and the arrangement can prevent the second air transmission chamber 16 from having too high humidity so as to ensure that the clean air output by the air outlet pipe 6 keeps more proper humidity, thereby preventing breathing discomfort and equipment aging of an electromechanical workshop. Of course, in the present invention, the water pipe 6 may be connected to a heater (not shown) to control the temperature of the water, thereby ensuring a moderate temperature of the outputted clean air.
The invention utilizes the disc-shaped filter 3 to remove dust, which can ensure that the air flow is larger, thereby improving the dust removal efficiency; the lower filtering structure 32 forms a water film structure by using centrifugal force to perform first filtering, the upper filtering net structure 31 is used to perform second filtering, and the humidity of the discharged air after dust removal can be ensured; and the lower filter structure 32 and/or the upper filter structure 31 are cleaned by means of the retractable water pipe 8 and the water quantity controller 7.
The expressions "exemplary embodiment," "example," and the like, as used herein, do not refer to the same embodiment, but are provided to emphasize different particular features. However, the above examples and exemplary embodiments do not preclude their implementation in combination with features of other examples. For example, even in a case where a description of a specific example is not provided in another example, unless otherwise stated or contrary to the description in the other example, the description may be understood as an explanation relating to the other example.
The terminology used in the present invention is for the purpose of illustrating examples only and is not intended to be limiting of the invention. Unless the context clearly dictates otherwise, singular expressions include plural expressions.
While example embodiments have been shown and described, it will be apparent to those skilled in the art that modifications and changes may be made without departing from the scope of the invention as defined by the claims.
Claims (8)
1. An environment-friendly dust removal device for an electromechanical engineering workshop comprises a filter, a wastewater recovery tank and a gas cleaning chamber; wherein:
the gas cleaning chamber comprises a lower shell and an upper shell, the lower shell comprises a first gas transmission chamber and a liquid recovery chamber, and the upper shell comprises a second gas transmission chamber; the first air transmission chamber and the second air transmission chamber are cylindrical with the same bottom surface and are arranged up and down correspondingly; in addition, the first air transmission chamber and the second air transmission chamber have a space therebetween, and the space forms an annular opening;
the liquid recovery chamber surrounds the first gas transmission chamber, and the liquid recovery chamber and the first gas transmission chamber are separated by a partition plate; the liquid recovery chamber is communicated with the wastewater recovery tank through a first connecting pipe;
providing the filter at the spacing, the filter being circular in plan view, concentrically with the cylinder, and having a radius greater than a radius of the bottom surface such that the filter extends through the annular opening to the liquid recovery chamber;
the filter comprises a lower layer filtering structure and an upper layer filtering net structure, wherein the lower layer filtering structure and the upper layer filtering net structure are disc-shaped structures which have the same size and are concentrically arranged; the lower layer filter structure comprises a first opening at the center thereof, a plurality of first connecting ribs with radial centers and grids among the first connecting ribs; the upper filter screen structure comprises a second opening in the center of the upper filter screen structure, a plurality of second connecting ribs radiating from the center of the upper filter screen structure and a filter screen extending from the second opening to the edge of the upper filter screen structure; the lower-layer filtering structure and the upper-layer filter screen structure are vertically separated by a certain distance, the first connecting ribs and the second connecting ribs vertically correspond to each other and are connected through a plurality of connecting columns, so that the lower-layer filtering structure and the upper-layer filter screen structure are fixed; a rotating shaft connected with a motor is clamped in the first opening to drive the filter to rotate centrifugally, and the motor is positioned at the bottom of the gas cleaning chamber; the top of the gas cleaning chamber is provided with a telescopic water pipe connected with an external water source, when the water pipe is extended to the longest length, the water pipe penetrates through the second gas transmission chamber and is inserted between the lower layer filter structure and the upper layer filter screen structure from the second opening, and the water pipe is provided with a spraying opening at the bottom of the water pipe, and the spraying opening is positioned between the lower layer filter structure and the upper layer filter screen structure;
the lower-layer filtering structure also comprises an annular platform part surrounding the first opening, the annular platform part is a metal sheet which is air-tight and water-tight and is integrally formed with the first connecting rib, and the grid net is arranged between the first connecting rib and the annular platform part; when the dust removal operation is carried out, the water sprayed from the spraying port directly falls to the annular platform part, and the water sprayed out forms a water film filtering layer on the grid under the action of centrifugal force.
2. An electro-mechanical engineering workshop environment-friendly dust removal device according to claim 1, wherein the gaps of the filter screen are smaller than the gaps of the grid.
3. The electro-mechanical engineering workshop environment-friendly dust removal device as claimed in claim 1, wherein a water flow controller is arranged between the water pipe and the external water source and used for controlling the flow velocity of water flow in the water pipe so as to control the spraying water amount and the spraying distance of the spraying opening.
4. The electro-mechanical engineering workshop environment-friendly dust removal device as claimed in claim 3, wherein the water outlet angle of the spray opening is adjustable, so that at least water sprayed from the spray opening can be sprayed onto the upper filter screen structure in a clean state.
5. An electro-mechanical engineering workshop environment-friendly dust removal device according to claim 1, wherein the upper filter screen structure further comprises brushes arranged on the edges, and the brushes are used for brushing away waste liquid on the wall of the liquid recovery chamber.
6. The electro-mechanical engineering workshop environment-friendly dust removal device as claimed in claim 1, wherein a second connecting pipe communicated with the wastewater recovery tank is connected to the bottom of the first gas transmission chamber.
7. The electro-mechanical engineering workshop environment-friendly dust removal device as claimed in claim 1, wherein the first air transmission chamber is connected with an air inlet pipe, and the air inlet pipe is connected with an external air extraction device.
8. The environmental-friendly dust removal device for the electromechanical engineering workshop, as recited in claim 7, wherein the second gas transmission chamber is connected with a gas outlet pipe; the air-extracting device inputs the air to be dedusted into the first air transmission chamber through the air inlet pipe, then reaches the second air transmission chamber through the filter, and outputs the air through the air outlet pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010198719.6A CN111346465B (en) | 2020-03-19 | 2020-03-19 | Electromechanical engineering workshop environmental protection dust collector |
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| CN202010198719.6A CN111346465B (en) | 2020-03-19 | 2020-03-19 | Electromechanical engineering workshop environmental protection dust collector |
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| CN111346465B true CN111346465B (en) | 2021-06-29 |
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| CN110743827A (en) * | 2019-10-12 | 2020-02-04 | 咸阳师范学院 | Dust collector for machining |
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| KR200240971Y1 (en) * | 1998-09-22 | 2001-09-25 | 김내순 | Car radio connection device of hands free device for mobile wireless telephone terminal |
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| CN208212798U (en) * | 2017-10-20 | 2018-12-11 | 盐城市港城机械设备有限公司 | A kind of environmental protection type sprinkling dust-extraction unit |
| CN208526160U (en) * | 2018-04-28 | 2019-02-22 | 四川鸿图实业有限公司 | A kind of high effect dust cleaner |
| CN208742207U (en) * | 2018-08-31 | 2019-04-16 | 鹤壁益民糠醛有限公司 | A kind of water film dust removal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688649A (en) * | 2012-06-05 | 2012-09-26 | 福建溪石股份有限公司 | Workshop dedusting equipment |
| CN204996291U (en) * | 2015-09-30 | 2016-01-27 | 东莞市龙洋环保科技有限公司 | Metal dust disposal equipment of polishing |
| CN205055737U (en) * | 2015-10-22 | 2016-03-02 | 山东恩贝生物工程有限公司 | Threonine production is with dust water film dust removal separator |
| KR20200006820A (en) * | 2018-07-11 | 2020-01-21 | (주)화당산업 | Impinger |
| CN110743827A (en) * | 2019-10-12 | 2020-02-04 | 咸阳师范学院 | Dust collector for machining |
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