CN201528640U - On-line microwave and airflow combined drying equipment for wheat bran - Google Patents
On-line microwave and airflow combined drying equipment for wheat bran Download PDFInfo
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- CN201528640U CN201528640U CN2009200424520U CN200920042452U CN201528640U CN 201528640 U CN201528640 U CN 201528640U CN 2009200424520 U CN2009200424520 U CN 2009200424520U CN 200920042452 U CN200920042452 U CN 200920042452U CN 201528640 U CN201528640 U CN 201528640U
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- wheat bran
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
Abstract
The utility model provides on-line microwave and airflow combined drying equipment for wheat bran, and relates to the field of drying grain. The equipment is formed by connecting a microwave drying unit and an airflow drying unit in sequence, wherein the microwave drying unit consists of a microwave generating system (8), a material delivery system, a control system and a temperature control system, and the airflow drying unit consists of an inductive material receiver (6), an air heater (12), a cyclone separator (13), a blower (14) and a pulse dust collector (15). The equipment can achieve a primary microwave heating drying and a secondary airflow drying of natural wind or hot air to the wheat bran. The microwave and airflow combined drying has the outstanding advantages of uniform heating and high heat efficiency. By adopting the equipment and method in the utility model, the moisture in the wheat bran can be controlled according to the requirements of users, the stability of the wheat bran can be remarkably improved, the production capacity is that 1 to 5 tons of wheat bran can be processed per hour, and the microwave processed wheat bran can be safely stored for more than 6 months under normal temperatures, thereby creating conditions for further processing the wheat bran.
Description
Technical field
The utility model relates to the grain drying field, relates in particular to a kind of wheat bran microwave and air-flow combination drying equipment.
Background technology
China is Wheat Production big country, and annual production breaks through 100,000,000 tons for many years.Wheat bran is the main byproduct of flour mill, can reach every year more than 2,000 ten thousand tons.Contain abundant carbohydrate, protein, fat, vitamin and mineral matter etc. in the wheat bran, can be developed into forage protein, edible wheat bran, dietary fiber, wheat bran albumen and wheat bran polysaccharide by deep processing, also can be used for producing xylitol, acetone and butanols, extraction glutamic acid and vitamin E etc., have very high economic benefit and social benefit.
Yet; usually can mix about 1.5% wheat embryo in the wheat bran; because wheat germ contains abundant fat hydrolase and lipoxidase; wheat bran itself contains more rich amylase system and a large amount of microorganisms simultaneously; so be easy to ferment heat, become sour and go mouldy, particularly at high temperature season annual seven, eight, the September.For preventing wheat bran going bad in storage, transportation, create conditions for the wheat bran deep processing, must manage to reduce the wheat bran moisture line stabilization processing of going forward side by side.
At present, the wheat bran drying has different drying devices such as electrical heating auger, vertical hot furnace and electrical heating fluid bed.Zhang Baozhu (low-cost wheat bran drying system, grain processing, 2007) has reported a kind of wheat bran drying system, the hot air source of this system is from hot-blast stove, with after hot blast mixes, the oven dry of being heated in more than 30 meters course of conveying reaches the purpose that reduces moisture to wheat bran before inducing threeway.Yet adopt coal furnace not only to pollute, and the indirect mode thermal efficiency is low to environment.Simultaneously, material speed of service in pipeline is fast, and the time of carrying out damp and hot exchange with hot-air is short, thereby the thermal efficiency further reduces.Huge, the complex operation of this device structure, oven dry cost height, quality is also wayward.Patent No. ZL200520086509.9, the patent documentation that name is called " dryer " discloses the drying unit of a kind of wheat bran or flour and other similar material, its organic frame upper, middle and lower portion three augers in fixing upper, middle and lower that tilt respectively, the discharging opening of last auger low side is arranged in the feed end top of auger, and the discharging opening of middle auger low side is positioned at the feed end top of auger down.The shell of each auger is made of inside panel and Shell Plate, in the cavity that forms between two plates electric heating tube is installed.This dryer adopts heat-conducting oil heating, only relies on the auger inwall and the wheat bran of close inner wall section to carry out energy exchange, and the thermal efficiency is low, thereby the operating cost height.
At present, do not see bibliographical information about the technology of wheat bran stabilization processes with equipment.Yet prior art has recognized that the microwave stabilisation is better than traditional mode of heating, and microwave has the advantage that thermal break-through power is strong, firing rate is fast, the time is short, the nutriment loss is few, effect dry, go out enzyme and sterilization that heating using microwave can reach.Number of patent application is the method and apparatus that 200710130943.6 patent documentation discloses the online enzyme that goes out of microwave of a kind of wheat embryo, and this is invented in dry wheat germ, has significantly improved the wheat germ storage-stable.Only for per hour handling wheat germ 5～50kg, yet this equipment can't satisfy per hour 3～5 tons online supporting requirement of wheat bran to its production capacity.
Summary of the invention
The heated-air drying thermal efficiency is low in the prior art, operating cost is high in order to overcome, the precipitation degree is limited, can not control defectives such as wheat bran moisture and microwave equipment yields poorly with weather, and the utility model provides a kind of thermal efficiency height, power consumptive province, easy to operate and be easy to online supporting wheat bran microwave and make up drying equipment with air-flow.
The technical solution adopted in the utility model is:
Online microwave of wheat bran and air-flow combination drying equipment: be connected in sequence by microwave drying and two unit of pneumatic conveying drying.Wherein the microwave drying unit is made up of microwave generation system, material-transporting system, control system and temperature control system, and its control system adopts the PLC programme-control, is positioned at the lower left of heating chamber; Microwave generation system be installed in heating chamber under, control system is electrically connected with microwave generation system; Material-transporting system is connected to form up and down by three augers, is positioned at microwave heating chamber, and connects top charging aperture and below discharging opening; The end of auger was electrically connected with control system during temperature control system was installed in.The pneumatic conveying drying unit is by inducing material receiver, air heater, reducing airduct, cyclone separator, blower fan and pulse dust collector etc. partly to form, it induces material receiver to connect microwave heating unit below discharging opening, hot wheat bran is after (doing) air fully mixes with cold/heat, in lifting process, carry out damp and hot exchange, wheat bran is through being positioned at the cyclone separator discharging of attic, and the lingering remnants of past customs is after cloth tube deduster is handled outside the discharge system.
The microwave heating unit structure: the microwave drying unit is made up of microwave generation system, material-transporting system, control system and temperature control system.Microwave generation system 8 is installed in the bottom of microwave heating chamber 1, is made up of 50 cover microwave generators, and microwave frequency is 2450 ± 50MHz, and every cover microwave generator power output is 1kW, and microwave output general power is in 0～50kW scope, and linearity is adjustable continuously.Material-transporting system is arranged in microwave heating chamber 1, by last auger 3, middle auger 4,5 three augers of following auger are formed, auger diameter 200～550mm, length 1000～4000mm, the auger shell adopts the special material that does not absorb microwave to make, and as glass, polyethylene, polypropylene, poly-tetrafluoro or ceramic material, packing auger blade and axle adopt stainless steel or carbon steel material.The charging aperture of last auger 3 left ends links to each other with airlock 2, the discharging opening of last auger 3 right-hand members is arranged in the charging aperture top of auger 4 right-hand members, the discharging opening of middle auger 4 left ends is positioned at the charging aperture top of auger 5 left ends down, and the discharging opening of following auger 5 right-hand members links to each other with induction type material receiver 6.Auger transmission device 7 is positioned at the heating chamber left side, adopts gear drive, infinitely variable speeds.Screw-conveyer-shaft on each auger links together with rack-mounted sprocket shaft respectively, and the sprocket wheel on each sprocket shaft sprocket wheel on chain and speed reducer output shaft respectively links together, and rack-mounted motor and reductor link together.Auger rotating speed 10～100 commentaries on classics/min, adjustable.Control system 9 is electrically connected with microwave generation system 8, adopts the PLC programme-control, and its input power supply is three-phase 380V ± 10%, 50Hz ± 1%, 0～40 ℃ of environment for use temperature, humidity≤80%.Temperature control system 10 is installed in down near the discharging opening of auger 5 right-hand members, adopts infrared induction to measure the discharging opening temperature of charge, regulates microwave power automatically according to the microwave heating temperature of setting, and realizes temperature controlling function, and temperature-control range is 0～150 ℃, and is adjustable continuously.
The pneumatic conveying drying cellular construction: the pneumatic conveying drying unit is by inducing material receiver, air heater, reducing airduct, cyclone separator, blower fan and pulse dust collector etc. partly to form.Induction type material receiver 6 is connected with the discharging opening of following auger 5 right-hand members of microwave heating unit,, mixes with natural wind or with hot-air from air heater 12 through induction type material receiver 6 from the hot wheat bran of microwave heating unit; Adopt reducing airduct 19 to be connected between cyclone separator 13 and the induction type material receiver 6, dust diameter changes in 150～400mm scope; All adopt airduct to connect between cyclone separator 13, blower fan 14 and the pulse dust collector 15, blower fan 14 is positioned at after the cyclone separator 13, before the pulse dust collector 15.The wheat bran that airlock 16 and 17 comes out inserts wheat bran auger 18 respectively by elephant trunk 20 and 21.
The course of work of this equipment is as follows: the transmission system 7 of at first opening microwave heating unit is opened airlock 2 then to suitable rotating speed, opens the blower fan 14 of pneumatic conveying drying unit simultaneously, pulse dust collector 15 and airlock 16,17.The wheat bran that enters into airlock 2 enters microwave heating chamber 1 successively.Open transmission system 7, when treating that induction type material receiver 6 has material, open microwave generation system 8.Three augers in the microwave heating chamber 1 come and go carries wheat bran, reaches the purpose that prolongs the wheat bran microwave heating time, by regulating the auger rotating speed, makes the turnover material reach balance; In control system 9, set microwave heating temperature, open temperature control system 10 then, measure the material temperature of auger 5 right-hand member discharging openings, regulate heating using microwave power automatically by control system 9.The hot wheat bran of heated by microwave mixes by induction type material receiver 6 and natural wind or with hot-air from air heater 12, and damper 11 makes intake and wind-warm syndrome reach OK range; (diameter 150～400mm) rises to the workshop top layer to wheat bran, separates dischargings through cyclone separator 13, and the lingering remnants of past customs is after pulse deduster 15 is handled outside the discharge system by reducing airduct 19.The wheat bran that airlock 16 and 17 comes out inserts wheat bran auger 18 respectively by elephant trunk 20 and 21, is delivered between the wheat bran packing.
Online microwave of wheat bran and air-flow Aassociation drying: microwave of the present utility model and air-flow combination drying equipment are installed between powder, and are connected with the flour production line.Isolated wheat bran is carried by elephant trunk from the square plansifter, enters microwave and air-flow combination drying equipment.Select the corresponding apparatus model according to wheat bran output.The utility model at first adopts microwave energy that wheat bran is heated to the water evaporates temperature, and the wheat bran through heating mixes with cold/heat (doing) air again, is delivered to the workshop attic by strength, and this process and air carry out damp and hot exchange, and the wheat bran surface moisture is overflowed.By the combination of microwave and pneumatic conveying drying, realize the online drying and the stabilisation of wheat bran.Pneumatic conveying drying of the present utility model unit not only can adopt hot blast, also can adopt cold (doing) wind.This equipment need not staff on duty after starting, and equipment can be adjusted parameter automatically according to mass flow and change of moisture content, makes moisture content of finished products reach setting value, realizes online oven dry, does not influence metering and packing.
Shown in Figure of description 1, the wheat bran that square plansifter gets off is carried by elephant trunk, at first enter the airlock 2 of microwave heating unit top, enter microwave heating chamber 1 again, material in the chamber through on auger 3, middle auger 4, following auger 5 comes and goes in the course of conveying and absorbs microwave energy, realizes heating using microwave and primary drying.Then, enter the pneumatic conveying drying unit by induction type material receiver 6, material carries out natural wind or from the redrying of the hot-air of air heater 12 in the process that strength is carried.Carry out redrying.
Microwave of the present utility model and air-flow combination drying equipment production capacity are for per hour handling 0.5～5 ton in wheat bran.Generally, the original moisture of wheat bran is below 20%, and the moisture requirement of finished product wheat bran according to initial water content, output and the whole moisture requirement of wheat bran, is selected the heating using microwave power of 12～50kw 11～14%.Microwave heating time is controlled at 2～10min, and Best Times is 5～8min; Microwave heating temperature is controlled at 50～100 ℃, and optimum temperature is 60～80 ℃.
Above-mentioned process conditions are to realize by following control device.
(1) sets the microwaves corresponding heating power according to the height of wheat bran output size and water content.
(2) according to the height setting microwaves corresponding heat time heating time of wheat bran output size and water content, reach the purpose of controlling microwave heating time by regulating the auger rotating speed.
(2) select microwave and hot blast (or cold wind) combination drying according to the height of wheat bran output size and water content,, realize the best of breed of microwave and pneumatic conveying drying by adjusting air door 11.When adopting hot blast, its wind-warm syndrome is not more than 80 ℃.
(4) adopt infrared induction, measure the wheat bran temperature of discharging opening.
(5) system can regulate heating using microwave power by PLC automatically according to the microwave heating temperature of setting, and realizes energy-efficient target.
" microwave+air-flow " combination drying has homogeneous heating, outstanding advantage that the thermal efficiency is high.Microwave drying is to heat internally, thermograde is identical with the direction of water transport, and pneumatic conveying drying to material be from the surface to inner drying, thermograde is opposite with the direction of water transport, the two combination can reach the purpose that not only shortens drying time but also reduce cost.Adopt wheat bran microwave of the present invention and air-flow combination drying equipment and method to control wheat bran moisture according to customer requirements, and can significantly improve wheat bran stability, production capacity is for per hour handling 1～5 ton in wheat bran, wheat bran through microwave treatment, the energy safe storage is more than 6 months, for condition has been created in the wheat bran deep processing under the normal temperature.Microwave of the present invention and air-flow Aassociation drying and equipment not only are used for the drying of wheat bran, are equally applicable to the drying of other products such as flour, rice bran, maize germ, wheat embryo, vegetable seed, wheat, paddy, corn and soybean.Removal 1～5% moisture that is particularly useful for.
This equipment is compared with existing flour, wheat bran drying plant, and drying cost can be saved more than 50%, also plays the effect of stabilisation wheat bran in dry wheat bran; Merge multinomial technology such as the automatic control of microwave, electromechanical integration and sensing, equipment and technology content height; Programmable Logic Controller PLC control, continuous automatic operation, control is in time, and is simple to operate; Moisture content of finished products is carried out Automatic Control,, guarantee that moisture content of finished products touches the mark, to greatest extent energy savings with controlling precipitation season; Whole system is under the negative pressure operates, and helps water evaporates, avoids dust to produce simultaneously; System bulk is little, and is easy for installation, is easy to online supporting.
Description of drawings
Fig. 1 is the structural representation of wheat bran microwave of the present invention and air-flow combination drying equipment, wherein 1 is microwave heating chamber, and 2 is airlock, and 3 is last auger, 4 is middle auger, 5 are following auger, and 6 is the induction type material receiver, and 7 is the auger transmission device, 8 is microwave generation system, 9 is control system, and 10 is temperature control system, and 11 is damper, 12 is air heater, 13 is cyclone separator, and 14 is blower fan, and 15 is pulse dust collector, 16 and 17 is airlock, 18 is the wheat bran auger, and 19 is the reducing airduct, and 20 and 21 is elephant trunk.
The specific embodiment
Below in conjunction with embodiment the utility model is elaborated:
Embodiment 1
It is 2100kg/h that square plansifter separates the wheat bran flow that obtains, and moisture is 15.5%.
At first open the transmission system 7 of microwave heating unit, regulating the auger rotating speed is 35 commentaries on classics/min, opens airlock 2 then, opens the blower fan 14 of pneumatic conveying drying unit simultaneously, deduster 15 and airlock 16,17.Wheat bran is sent into airlock 2 by elephant trunk, enters auger 3 on the mass transport auger then successively, middle auger 4, and following auger 5, the auger diameter is 400mm, and length is 3000mm.When treating that induction type material receiver 6 has material, open microwave generation system, regulating heating using microwave power is 12kw, and is 22 commentariess on classics/min by regulating the auger rotating speed, makes to pass in and out material and reach balance; It is 50 ℃ that control system 9 is set microwave heating temperature, opens temperature control system 8 then, measures the material temperature of auger 5 right-hand member discharging openings down, regulates heating using microwave power automatically by control system 9.
Hot wheat bran mixes with natural wind through induction type material receiver 6, damper 11, and making the natural wind intake is 1200m
3/ min.Rise to the workshop top layer by reducing airduct 19 (diameter 400 become 150mm) then, separate dischargings through cyclone separator 13, the lingering remnants of past customs is after pulse deduster 15 is handled outside the discharge system.
After testing, the whole moisture of wheat bran is 13.6%.
The wheat bran flow is 2100kg/h, and moisture is 15.5%.
At first open the transmission system 7 of microwave heating unit, regulating the auger rotating speed is 35 commentaries on classics/min, opens airlock 2 then, opens the blower fan 14 of pneumatic conveying drying unit simultaneously, deduster 15 and airlock 16,17.Wheat bran is sent into airlock 2 by elephant trunk, enters auger 3 on the mass transport auger then successively, middle auger 4, and following auger 5, the auger diameter is 200mm, and length is 1000mm.When treating that induction type material receiver 6 has material, open microwave generation system, regulating heating using microwave power is 50kw, and is 18 commentariess on classics/min by regulating the auger rotating speed, makes to pass in and out material and reach balance; Setting microwave heating temperature in control system 9 is 100 ℃, opens temperature control system 8 then, measures the material temperature of auger 5 right-hand member discharging openings down, regulates heating using microwave power automatically by control system 9.
Hot wheat bran mixes with hot blast through induction type material receiver 6, and setting the hot blast wind-warm syndrome is 60 ℃, damper 11, and making the hot blast air quantity is 1200m
3/ min.Rise to the workshop top layer by reducing airduct 19 (diameter 500 become 250mm) then, separate dischargings through cyclone separator 13, the lingering remnants of past customs is after pulse deduster 15 is handled outside the discharge system.
After testing, the whole moisture of wheat bran is 12.9%.
The wheat bran flow is 4900kg/h, and moisture is 15.8%.
At first open the transmission system 7 of microwave heating unit, regulating the auger rotating speed is 40 commentaries on classics/min, opens airlock 2 then, opens the blower fan 14 of pneumatic conveying drying unit simultaneously, deduster 15 and airlock 16,17.Wheat bran is sent into airlock 2 by elephant trunk, enters auger 3 on the mass transport auger then successively, middle auger 4, and following auger 5, the auger diameter is 550mm, and length is 4000mm.When treating that induction type material receiver 6 has material, open microwave generation system, regulating heating using microwave power is 45kw, and is 20 commentariess on classics/min by regulating the auger rotating speed, makes to pass in and out material and reach balance; It is 60 ℃ that control system 9 is set microwave heating temperature, opens temperature control system 8 then, measures the material temperature of auger 5 right-hand member discharging openings down, regulates heating using microwave power automatically by control system 9.
Hot wheat bran mixes with natural wind through induction type material receiver 6, damper 11, and making the natural wind intake is 2500m
3/ min.Rise to the workshop top layer by reducing airduct 19 (diameter 500 become 250mm) then, separate dischargings through cyclone separator 13, the lingering remnants of past customs is after pulse deduster 15 is handled outside the discharge system.
After testing, the whole moisture of wheat bran is 13.3%.
Claims (3)
1. online microwave of wheat bran and air-flow make up drying equipment, be connected in sequence by microwave drying and two unit of pneumatic conveying drying, wherein the microwave drying unit is by microwave generation system (8), material-transporting system, control system and temperature control system are formed, the pneumatic conveying drying unit is by inducing material receiver (6), air heater (12), cyclone separator (13), blower fan (14) and pulse dust collector (15) are formed, it is characterized in that microwave generation system in the microwave drying unit (8) is installed in the bottom of microwave heating chamber (1), material-transporting system is arranged in microwave heating chamber (1), by last auger (3), middle auger (4), (5) three augers of following auger are formed, the charging aperture of last auger (3) left end links to each other with airlock (2), the discharging opening of last auger (3) right-hand member is arranged in the charging aperture top of auger (4) right-hand member, the discharging opening of middle auger (4) left end is positioned at the charging aperture top of auger (5) left end down, the discharging opening of following auger (5) links to each other with induction type material receiver (6), auger transmission device (7) is positioned at the left side of microwave heating chamber (1), control system (9) is electrically connected with microwave generation system (8), temperature control system (10) is installed in down near the discharging opening of auger (5) right-hand member, induction type material receiver (6) is connected with the discharging opening of the following auger (5) of microwave heating unit in the pneumatic conveying drying unit, adopt reducing airduct (19) to be connected between cyclone separator (13) and the induction type material receiver (6), cyclone separator (13), all adopt airduct to connect between blower fan (14) and the pulse dust collector (15), blower fan (14) is positioned at cyclone separator (13) afterwards, pulse dust collector (15) before.
2. online microwave of wheat bran according to claim 1 and air-flow combination drying equipment, it is characterized in that microwave generation system (8) overlaps microwave generators by 50 and forms, microwave frequency is 2450 ± 50MHz, every cover microwave generator power output is 1kW, microwave is exported general power in 0～50kW scope, and adjustable continuously.
3. online microwave of wheat bran according to claim 1 and air-flow make up drying equipment, it is characterized in that auger diameter 200～550mm, the length 1000～4000mm of the last auger (3) of described material-transporting system, middle auger (4), following auger (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200424520U CN201528640U (en) | 2009-06-12 | 2009-06-12 | On-line microwave and airflow combined drying equipment for wheat bran |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200424520U CN201528640U (en) | 2009-06-12 | 2009-06-12 | On-line microwave and airflow combined drying equipment for wheat bran |
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| CN201528640U true CN201528640U (en) | 2010-07-21 |
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| CN2009200424520U Expired - Fee Related CN201528640U (en) | 2009-06-12 | 2009-06-12 | On-line microwave and airflow combined drying equipment for wheat bran |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102396770A (en) * | 2011-04-11 | 2012-04-04 | 南通粮食机械有限公司 | Broad bean processing device |
| CN102805292A (en) * | 2012-09-05 | 2012-12-05 | 江南大学 | Method for stabilizing wheat bran specially used for whole wheat flour |
| CN105675054A (en) * | 2016-01-25 | 2016-06-15 | 无锡希姆勒包装设备有限公司 | Online moisture measuring and control system |
| CN111213482A (en) * | 2020-02-26 | 2020-06-02 | 江苏大学 | Grain tank and harvester with real-time monitoring and dehumidification functions of storage state during harvesting |
| CN113575765A (en) * | 2021-08-04 | 2021-11-02 | 李俊玲 | Low-toxin and storage-resistant wheat bran for feed and preparation method thereof |
-
2009
- 2009-06-12 CN CN2009200424520U patent/CN201528640U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102396770A (en) * | 2011-04-11 | 2012-04-04 | 南通粮食机械有限公司 | Broad bean processing device |
| CN102805292A (en) * | 2012-09-05 | 2012-12-05 | 江南大学 | Method for stabilizing wheat bran specially used for whole wheat flour |
| CN105675054A (en) * | 2016-01-25 | 2016-06-15 | 无锡希姆勒包装设备有限公司 | Online moisture measuring and control system |
| CN111213482A (en) * | 2020-02-26 | 2020-06-02 | 江苏大学 | Grain tank and harvester with real-time monitoring and dehumidification functions of storage state during harvesting |
| CN113575765A (en) * | 2021-08-04 | 2021-11-02 | 李俊玲 | Low-toxin and storage-resistant wheat bran for feed and preparation method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20100721 Termination date: 20110612 |