CN105691973A - Heating type stock bin breathing device - Google Patents
Heating type stock bin breathing device Download PDFInfo
- Publication number
- CN105691973A CN105691973A CN201610122767.0A CN201610122767A CN105691973A CN 105691973 A CN105691973 A CN 105691973A CN 201610122767 A CN201610122767 A CN 201610122767A CN 105691973 A CN105691973 A CN 105691973A
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- CN
- China
- Prior art keywords
- filter element
- feed bin
- inner shell
- pipe
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
- B01D46/0005—Mounting of filtering elements within casings, housings or frames
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a heating type stock bin breathing device. The heating stock bin breathing device comprises a body system composed of an inner shell, an outer shell, a filter element, a connection flange, a filter element fixing flange and a cover plate, a heating system composed of a hot fluid medium inlet pipeline, a hot fluid medium outlet pipe and a jacket formed by the inner shell and the outer shell or a heating system composed of a tracing pipe, aluminum foil and a heat-preserving layer, and an ash removing system composed of a cylinder, an electromagnetic valve, a pulse pipeline and an exhausting pipeline. The heating type stock bin breathing device has the beneficial effects that the breathing device is simple in device technology and elements can be maintained and replaced conveniently; vibration dust removal or pulse jet cleaning dust removal is performed, powder attached to the filter element can be cleared away regularly, and equipment resistance cannot be increased; after the temperature of the wall face of the inner shell and the temperature around the filter element are raised properly, water vapor carried by airflow in a stock bin cannot form water drops on the surface of an object, and therefore the situations that bag pasting happens to the filter element and the inner shell and the exhausting pipeline cake and are blocked cannot be caused; and the frequency of overhead work is greatly reduced, and workloads and dangerousness of maintenance are reduced.
Description
Technical field
The present invention relates to feed bin technical field, particularly relate to a kind of heated type feed bin breathing equipment。
Background technology
In powder technology field, loading, unloading, fortune, storage, use, the supporting equipment potential that will give full play to of each link technical equipment, the transfer cycle is short, and utilization rate is high, could meet the requirement produced。
In production practices, when, in material charging and discharge process, in storehouse, the volume of gas is all in change, is at this moment accomplished by breathing equipment and carrys out surge bin external and internal pressure。Material charging process, gas need to be discharged outside storehouse by breathing equipment；Material discharge process, need to be sucked gas outside storehouse in storehouse by breathing equipment。Finished product materials usually has certain temperature and moisture, and moisture is easily evaporated, if taking no action to, steam runs into low temperature wall and will condense。Material charging process, owing to thermal current can flow from bottom to top, in powder body, moisture moves up with powder mixture after being evaporated, temperature is step-down gradually, particularly breathing equipment is positioned over outdoor, temperature is lower, when the mixture of steam and powder body is by breathing equipment, temperature cools down further, it is likely occurred steam and meets the condensation of cold wall face, lump after being combined with dust, cause filter element to stick with paste bag, inwall and discharge duct caking, be also easy to for a long time block whole passage in the past, have a strong impact on breathing equipment normal operation；In discharge process, extraneous gas enters in storehouse by breathing equipment, when outside air humidity is bigger, it is also possible to possibility, particularly winter and the northern area of condensation and caking blocking channel occur in breathing equipment, and this phenomenon is even more serious。If breathing equipment cisco unity malfunction, material conveying being caused not smooth, security incident even occurs, especially the ubiquitous caking of the breathing equipment of Pulverized Coal Bin, filter element blocking cause that security incident happens occasionally。
The relation of temperature, water capacity, humidity and water dew point is: temperature is more high, and the trend that water capacity increases is into similar exponential relationship to be increased, and humidity corresponding to same water capacity is more little, and what reach aqueous dew point temperature is likely to more little, and being likely to of namely condensing is more little。Properly increase the temperature of breathing equipment inner shell wall, reduce material in feed bin, the temperature difference between air-flow and inner shell wall is the method preventing condensation most effective, most economical as far as possible。The temperature of breathing equipment inner shell wall need to be determined according to the character of material, forbids exceeding the safe temperature of material。
Breathing equipment exhaust passage is not smooth, not only causes very big impact to producing, and can cause environmental pollution, serious accident even occurs。It addition, breathing equipment is typically mounted at container top or container top sidewall, position is higher, and maintenance difficulty is very big。Meeting production needs, breathing equipment must have following characteristics:
(1) equalizing reservoir external and internal pressure, it is prevented that pressure imbalance causes material difficulty of transportation and potential safety hazard；
(2) aerofluxus carries out dedusting while breathing, it is prevented that has the phenomenon of overflow to occur, pollutes environment；
(3) long service life, and easily maintain replacing。
Although existing breathing equipment outer wall is taked insulation, is installed a series of measures such as vibrating mechanism, but also can only slowing device blocking time, being cooled after cannot fundamentally solving the surface of thermal material, the hot-air cold object of chance, steam will precipitate out and form, at cold body surface, numerous adverse consequencess that the globule causes。Breathing equipment blocking harm is as follows:
(1) feed bin outer air cannot be introduced in feed bin, has certain vacuum that the material in feed bin can be caused to drain into outside storehouse smoothly in feed bin；
(2) in feed bin, pressure cannot drain into outside feed bin, and charging can be caused to have some setbacks, and safety valve action is frequent, and dust escapes into outside feed bin, contaminated environment；
(3) changing and maintenance load is huge, the wet powder agglomates filtered is bonded at inside breathing equipment, is difficult to clean up clean, and is work high above the ground, there is certain potential safety hazard。
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of heated type feed bin breathing equipment, gathering dust when solving material feeding warehouse, discharging bin, pressure balance and service life problem。
The technical solution adopted in the present invention is: a kind of heated type feed bin breathing equipment, including:
The main body system being made up of inner shell, shell, filter element, adpting flange, fixing filter element flange, cover plate, warehouse is assembled into one by adpting flange and feed bin, feed bin top is equipped with relief valve, shell is welded on inner shell, filter element is fixed by fixing filter element flange, cover plate coordinates with bodies top, is additionally provided with prevent that filter element from coming off in feed bin anti-and slips through the net in inner shell；
The heating system that the chuck formed by hot fluid medium inlet pipeline, hot fluid medium outlet conduit, inner shell and shell forms, hot fluid medium inlet pipeline is entered chuck by shell upper (or bottom), and hot fluid medium outlet conduit is drawn from chuck by outer casing underpart (or top)；
The soot cleaning system being made up of cylinder, electromagnetic valve, pulse pipe, discharge duct, cylinder is connected with electromagnetic valve import, and electromagnetic valve outlet is connected with pulse pipe import, and pulse pipe outlet is in above filter element, and discharge duct is connected with cover plate。
Another kind of technical scheme of the present invention is: a kind of heated type feed bin breathing equipment, including:
The main body system being made up of inner shell, filter element, adpting flange, fixing filter element flange and cover plate, described filter element is arranged in inwall by fixing filter element flange, warehouse is assembled into one by adpting flange and feed bin, feed bin top is equipped with relief valve, cover plate and the top being arranged on warehouse inwall, the bottom of described warehouse inwall is provided with can prevent that filter element from coming off in feed bin anti-and slips through the net；
The heating system being made up of heat tracing pipe, aluminium foil and heat-insulation layer, heat tracing pipe is wrapped in the outside of inwall, and described heat-insulation layer is arranged on the outside of heat tracing pipe, and is provided with one layer of aluminium foil between heat tracing pipe and heat-insulation layer；
The soot cleaning system being made up of cylinder, electromagnetic valve, pulse pipe and discharge duct, described cylinder is connected with electromagnetic valve import, electromagnetic valve outlet is connected with pulse pipe import, and pulse pipe outlet is in the top of filter element, and described discharge duct is connected with cover plate。
As a preferred technical solution of the present invention, described hot fluid medium is the one in hot-air or heat smoke or hot water or water vapour or other hot fluid。
As a preferred technical solution of the present invention, described leakproof web material matter is anti-corrosion material, and structure is holey。
As a preferred technical solution of the present invention, described heat tracing pipe is wrapped in the outside of inwall in a helical pattern uniformly。
As a preferred technical solution of the present invention, described heat tracing pipe is steam companions。
As a preferred technical solution of the present invention, described heat tracing pipe is electric heating tube。
Compared with prior art, the breathing equipment of the present invention provides the benefit that:
(1) device technique is simple, and maintenance, replacing element are conveniently；
(2) vibrations dedusting or pulse back blow dedusting, on filter element, the powder body of attachment can regularly be cleared up, and will not increase equipment resistance；
(3) after inner shell wall, filter element environment temperature properly increase, the steam that in feed bin, air-flow carries can not form the globule at body surface, does not thus have filter element and sticks with paste bag, the situation of inner shell and discharge duct wall caking, blocking；
(4) greatly reduce the frequency of work high above the ground, reduce workload and the danger of maintenance。
Accompanying drawing explanation
In order to be illustrated more clearly that technical scheme, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the hot fluid heats formula overall structure schematic diagram of the present invention；
Fig. 2 is the vibrator ash disposal structure chart of the present invention；
Fig. 3 is the heat tracing pipe heated type overall structure figure of the present invention；
Fig. 4 is the heat tracing pipe heated type heat tracing pipe distributed architecture figure of the present invention。
In figure: 1, inner shell, 2, shell, 3, filter element, 4, adpting flange, 5, fixing filter element flange, 6, cover plate, 7, hot fluid medium inlet pipeline, 8, hot fluid medium outlet conduit, 9, cylinder, 10, electromagnetic valve, 11, pulse pipe, 12, discharge duct, 13, anti-slip through the net, 14, feed bin, 15, relief valve, 16, vibrator, 17, heat tracing pipe, 18, aluminium foil, 19, heat-insulation layer。
Detailed description of the invention
In order to be able to be more clearly understood that technical scheme, below in conjunction with accompanying drawing, the present invention is further described。
Embodiment one
As it is shown in figure 1, a kind of heated type feed bin breathing equipment described in the present embodiment, including:
The main body system being made up of inner shell 1, shell 2, filter element 3, adpting flange 4, fixing filter element flange 5, cover plate 6, warehouse is assembled into one by adpting flange 4 and feed bin 14, feed bin 14 top is equipped with relief valve 15, shell 2 is welded on inner shell 1, filter element 3 is fixed by fixing filter element flange 5, cover plate 6 coordinates with bodies top, is additionally provided with prevent that filter element 3 from coming off in feed bin 14 anti-and slips through the net 13 in inner shell 1；
The heating system that the chuck formed with shell 2 by hot fluid medium inlet pipeline 7, hot fluid medium outlet conduit 8, inner shell 1 forms, hot fluid medium inlet pipeline 7 is entered chuck by shell 2 top, hot fluid medium outlet conduit 8 is drawn from chuck by shell 2 bottom, and described hot fluid medium can adopt the air of 40 DEG C-85 DEG C；Hot-air enters inlet pipeline 7 and chuck, inner shell 1 is heated, and after improving inner shell wall temperature, filter element environment temperature, discharges then through outlet conduit 8, it is ensured that when air-flow is by breathing equipment, the steam in air-flow will not be condensed into the globule。
The soot cleaning system being made up of cylinder 9, electromagnetic valve 10, pulse pipe 11, discharge duct 12, cylinder 9 is connected with electromagnetic valve 10 import, electromagnetic valve 10 outlet is connected with pulse pipe 11 import, pulse pipe 11 outlet is in above filter element 3, discharge duct 12 is connected with cover plate 6, deashing device is regularly to filter element blowback, it is ensured that on filter element, the dust of attachment is cleared up in time；Gas realizes the balance of external and internal pressure by discharge duct 12, filter element 3 and feed bin 14 turnover。
Wherein, in the present embodiment, described hot fluid medium is the one in hot-air or heat smoke or hot water or water vapour or other hot fluid。
Wherein, in the present embodiment, described anti-13 materials of slipping through the net are anti-corrosion material, and structure is holey。
Wherein soot cleaning system is not limited to the form executed described by example, and as shown in Figure 2, soot cleaning system can pass through the vibrator 16 dust with the form cleaning filter element attachment of vibration。
Embodiment two
As it is shown on figure 3, a kind of heated type feed bin breathing equipment described in the present embodiment, including:
The main body system being made up of inner shell 1, filter element 3, adpting flange 4, fixing filter element flange 5 and cover plate 6, described filter element 3 is arranged in inwall 1 by fixing filter element flange 5, warehouse is assembled into one by adpting flange 4 and feed bin 14, feed bin 14 top is equipped with relief valve 15, cover plate 6 and the top being arranged on warehouse inwall 1, the bottom of described warehouse inwall 1 is provided with can prevent that filter element 3 from coming off in feed bin 14 anti-and slips through the net 13；
The heating system being made up of heat tracing pipe 17, aluminium foil 18 and heat-insulation layer 19, heat tracing pipe 17 is wrapped in the outside of inwall 1, and described heat-insulation layer 19 is arranged on the outside of heat tracing pipe 17, and is provided with one layer of aluminium foil 18 between heat tracing pipe 17 and heat-insulation layer 19；
The soot cleaning system being made up of cylinder 9, electromagnetic valve 10, pulse pipe 11 and discharge duct 12, described cylinder 9 is connected with electromagnetic valve 10 import, electromagnetic valve 10 outlet is connected with pulse pipe 11 import, pulse pipe 11 outlet is in the top of filter element 3, regularly to filter element blowback, guaranteeing that on filter element, the dust of attachment is cleared up in time, described discharge duct 12 is connected with cover plate 6, and gas realizes the balance of external and internal pressure by discharge duct 12, filter element 3 and feed bin 14 turnover。
Wherein, in the present embodiment, as shown in Figure 4, described heat tracing pipe 17 is wrapped in the outside of inwall shell 1 in a helical pattern uniformly, and heat tracing pipe 17 is connected to temp-controlling element simultaneously。
Wherein, in the present embodiment, described heat tracing pipe 17 is steam companions。
Wherein, in the present embodiment, described heat tracing pipe 17 is electric heating tube, when being chosen as electric heating tube, it shall be guaranteed that its insulating properties；Inner shell 1 is heated by heat tracing pipe 17, improves inner shell 1 wall temperature, filter element environment temperature, it is ensured that when air-flow is by breathing equipment, the steam in air-flow will not be condensed into water；The temperature of heating inner shell wall need to be determined according to the character of material, forbids exceeding the safe temperature of powder body。
At material in course of conveying, heated type feed bin breathing equipment is adopted to have very big superiority:
(1) device technique is simple, and easily worn part changes facility, and maintenance is convenient；
(2) timing blowback, on filter element attachment powder body can periodic cleaning, equipment resistance will not be increased；
(3) after inner shell wall temperature, filter element environment temperature properly increase, the steam that in feed bin, air-flow carries can not form the globule at body surface, does not thus have filter element blocking, and the problem of inner shell and discharge duct blocking occurs；
(4) many breathing equipments are arranged on Cang Ding or storehouse side wall, and service life of equipment is long, which reduces the danger of work high above the ground。
Above description elaborates a lot of detail so that fully understanding the present invention, but, the present invention can also adopt other to be different from other modes described here to implement, it is thus impossible to be interpreted as limiting the scope of the invention。
In a word; although the present invention illustrates above-mentioned preferred implementation, but it should be mentioned that, although those skilled in the art can carry out various change and remodeling; unless such change and remodeling deviate from the scope of the present invention, otherwise should be construed as being included in protection scope of the present invention。
Claims (7)
1. a heated type feed bin breathing equipment, it is characterised in that including:
The main body system being made up of inner shell (1), shell (2), filter element (3), adpting flange (4), fixing filter element flange (5), cover plate (6), warehouse is assembled into one by adpting flange (4) and feed bin (14), feed bin (14) top is equipped with relief valve (15), shell (2) is welded on inner shell (1), filter element (3) is fixed by fixing filter element flange (5), cover plate (6) coordinates with bodies top, is additionally provided with anti-slip through the net (13) preventing filter element (3) from coming off in feed bin (14) in inner shell (1)；
The heating system that the chuck formed with shell (2) by hot fluid medium inlet pipeline (7), hot fluid medium outlet conduit (8), inner shell (1) forms, hot fluid medium inlet pipeline (7) is entered chuck by shell (2) top, and hot fluid medium outlet conduit (8) is drawn from chuck by shell (2) bottom；
The soot cleaning system being made up of cylinder (9), electromagnetic valve (10), pulse pipe (11), discharge duct (12), described cylinder (9) is connected with electromagnetic valve (10) import, electromagnetic valve (10) outlet is connected with pulse pipe (11) import, pulse pipe (11) outlet is in filter element (3) top, and discharge duct (12) is connected with cover plate (6)。
2. a heated type feed bin breathing equipment, it is characterised in that including:
The main body system being made up of inner shell (1), filter element (3), adpting flange (4), fixing filter element flange (5) and cover plate (6), described filter element (3) is arranged in inner shell (1) by fixing filter element flange (5), warehouse is assembled into one by adpting flange (4) and feed bin (14), feed bin (14) top is equipped with relief valve (15), cover plate (6) and the top being arranged on inner shell (1), the bottom of described inner shell (1) is provided with anti-slip through the net (13) that can prevent filter element (3) from coming off in feed bin (14)；
The heating system being made up of heat tracing pipe (17), aluminium foil (18) and heat-insulation layer (19), heat tracing pipe (17) is wrapped in the outside of inner shell (1), described heat-insulation layer (19) is arranged on the outside of heat tracing pipe (17), and is provided with one layer of aluminium foil (18) between heat tracing pipe (17) and heat-insulation layer (19)；
The soot cleaning system being made up of cylinder (9), electromagnetic valve (10), pulse pipe (11) and discharge duct (12), described cylinder (9) is connected with electromagnetic valve (10) import, electromagnetic valve (10) outlet is connected with pulse pipe (11) import, pulse pipe (11) outlet is in the top of filter element (3), and described discharge duct (12) is connected with cover plate (6)。
3. a kind of heated type feed bin breathing equipment according to claim 1 and 2, it is characterised in that described anti-(13) material of slipping through the net is anti-corrosion material, and structure is holey。
4. a kind of heated type feed bin breathing equipment according to claim 1, it is characterised in that described hot fluid medium is the one in hot-air or heat smoke or hot water or water vapour or other hot fluid。
5. a kind of heated type feed bin breathing equipment according to claim 2, it is characterised in that described heat tracing pipe (17) is wrapped in the outside of inner shell (1) in a helical pattern uniformly。
6. a kind of heat tracing pipe heated type feed bin breathing equipment according to claim 2, it is characterised in that described heat tracing pipe (17) is steam companions。
7. a kind of heat tracing pipe heated type feed bin breathing equipment according to claim 2, it is characterised in that described heat tracing pipe (17) is electric heating tube。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610122767.0A CN105691973A (en) | 2016-03-04 | 2016-03-04 | Heating type stock bin breathing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610122767.0A CN105691973A (en) | 2016-03-04 | 2016-03-04 | Heating type stock bin breathing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105691973A true CN105691973A (en) | 2016-06-22 |
Family
ID=56220129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610122767.0A Pending CN105691973A (en) | 2016-03-04 | 2016-03-04 | Heating type stock bin breathing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105691973A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109051395A (en) * | 2018-09-03 | 2018-12-21 | 泗阳宝源塑胶材料有限公司 | Silo roof exhaust recovery device and collecting bin with the device |
| CN110374847A (en) * | 2019-08-09 | 2019-10-25 | 张家港市瑞德顺达机械有限公司 | A kind of pulse pump and distributing device |
| CN115583506A (en) * | 2022-10-08 | 2023-01-10 | 广东众大智能科技有限公司 | Dust removal breathing device |
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| AU601950B2 (en) * | 1985-10-04 | 1990-09-27 | D. Franklin Howeth | Backflushed air filter with quick opening multiple discharge valve |
| CN101147840A (en) * | 2006-09-21 | 2008-03-26 | 刘岊阳 | Spraying dryer |
| CN203281148U (en) * | 2013-06-18 | 2013-11-13 | 浙江吉天环保科技有限公司 | Combined type dust remover |
| CN203874585U (en) * | 2014-05-15 | 2014-10-15 | 河南龙成煤高效技术应用有限公司 | Dust removal device applied to filter element of dust remover |
| CN104785024A (en) * | 2015-04-01 | 2015-07-22 | 成都易态科技有限公司 | Gas filtering device |
| CN105056662A (en) * | 2015-08-23 | 2015-11-18 | 西南科技大学 | Method suitable for collecting ultrafine powder in superheated steam state and filter cartridge dust remover |
| CN204987029U (en) * | 2015-07-31 | 2016-01-20 | 翁美玲 | Chemical industry burns device convenient to material loading |
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2016
- 2016-03-04 CN CN201610122767.0A patent/CN105691973A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU601950B2 (en) * | 1985-10-04 | 1990-09-27 | D. Franklin Howeth | Backflushed air filter with quick opening multiple discharge valve |
| CN101147840A (en) * | 2006-09-21 | 2008-03-26 | 刘岊阳 | Spraying dryer |
| CN203281148U (en) * | 2013-06-18 | 2013-11-13 | 浙江吉天环保科技有限公司 | Combined type dust remover |
| CN203874585U (en) * | 2014-05-15 | 2014-10-15 | 河南龙成煤高效技术应用有限公司 | Dust removal device applied to filter element of dust remover |
| CN104785024A (en) * | 2015-04-01 | 2015-07-22 | 成都易态科技有限公司 | Gas filtering device |
| CN204987029U (en) * | 2015-07-31 | 2016-01-20 | 翁美玲 | Chemical industry burns device convenient to material loading |
| CN105056662A (en) * | 2015-08-23 | 2015-11-18 | 西南科技大学 | Method suitable for collecting ultrafine powder in superheated steam state and filter cartridge dust remover |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109051395A (en) * | 2018-09-03 | 2018-12-21 | 泗阳宝源塑胶材料有限公司 | Silo roof exhaust recovery device and collecting bin with the device |
| CN110374847A (en) * | 2019-08-09 | 2019-10-25 | 张家港市瑞德顺达机械有限公司 | A kind of pulse pump and distributing device |
| CN115583506A (en) * | 2022-10-08 | 2023-01-10 | 广东众大智能科技有限公司 | Dust removal breathing device |
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Application publication date: 20160622 |
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