CN204074182U - A kind of ball mill - Google Patents
A kind of ball mill Download PDFInfo
- Publication number
- CN204074182U CN204074182U CN201420607310.5U CN201420607310U CN204074182U CN 204074182 U CN204074182 U CN 204074182U CN 201420607310 U CN201420607310 U CN 201420607310U CN 204074182 U CN204074182 U CN 204074182U
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- ball
- ball mill
- induced duct
- grinding cylinder
- collecting bin
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Abstract
The utility model discloses a kind of ball mill, comprise ball grinding cylinder, collecting bin; Collecting bin one end is communicated with ball grinding cylinder by the grate plate that delivers from godown; Collecting bin other end top is connected with blower fan by airduct, and bottom leads to charge tube and communicates with material storehouse; Also be provided with induced duct in described collecting bin, induced duct one end is stretched in ball grinding cylinder, and the other end stretches in airduct, is provided with deep bead between induced duct and airduct or collecting bin; Collecting bin housing is provided with air-vent.Adopt ball mill of the present utility model, can according to need of production, strengthen flow, the flow velocity of air-flow in grinder, and in turn ensure that material has sufficient milling time in grinder, time higher for the comprehensive moisture content of mill feed material, still can take into account end product quality and output.
Description
Technical field
The utility model relates to a kind of ball mill for material grinding, as cement flour grinding machine.
Background technology
Ball mill when grinding material because friction can produce a large amount of heat energy, internal temperature is raised, and polished material is if cement is more or less containing moisture content (1%-6%), the moisture content in material becomes steam because temperature raises in grinding.If steam can not be discharged in time, in hot and humid environment, very easily produce in ball mill and stick with paste mill (in hot and humid environment, under the acting in conjunction of moisture content and electrostatic, fine granular materials is adsorbed on ball mill inwall, compartment, grate plate surface of delivering from godown, abrasive body are surperficial, is called and sticks with paste mill).Do not changing under working condition, sticking with paste mill and can pass more and more serious in time, finally may have to shut down, could recover after carrying out artificial treatment, have a strong impact on quality and running rate, and specific energy consumption significantly will rise.So the hot and humid key point namely becoming decline consume in solution ball mill.Reduce when grinding material to make ball mill and stick with paste mill, the measure usually adopted strengthens mill inner ventilation to reduce mill built-in temperature and temperature of charge, discharges steam in time, to reduce Electrostatic Absorption, and grinding effect of raising abrasive body.
Existing ball mill as shown in Figure 1, it comprises sand cylinder 8, abrasive body 7 is placed with in sand cylinder, be designed with grate plate used for isolating bin 3 in the middle part of sand cylinder, sand cylinder front portion is provided with material inlet 2, is provided with exhausting system and discharge system in sand cylinder afterbody rewinding cone, it comprises collecting bin 9, collecting bin one end communicates with the grate plate 4 that delivers from godown of ball grinding cylinder, and other end top is connected with blower fan by airduct 5, and other end bottom leads to charge tube 6 and communicates with material storehouse.Exhausting system, by air inlet 1 air intake from ball mill front end, by ball grinding cylinder, the grate plate that delivers from godown, collecting bin, airduct air draft, forms the single direction air current flow mode running through whole ball mill in ball mill.Air-flow, while the water vapour in ball mill is taken out of, also reduces the temperature in ball mill.Suitable raising air flow rate, flow velocity will be conducive to the cooling of drying in ball mill.But because the movement velocity of material is also by the impact of air flow rate, flow velocity, air flow rate, flow rate are higher, and Flow of Goods and Materials speed is faster.Air flow rate, flow velocity are excessive, the polished deficiency of time of material will be caused just to enter material storehouse, cannot obtain the material of release mesh.Therefore the function of drying and lowering the temperature of existing exhausting system is limited., there is the drawback of attending to one thing and lose sight of another in cannot taking into account both being controlled between quality and output by wind mode of prior art.A lot of enterprise all important affair is front by drying materials, reaches the comprehensive moisture content < 1% of mill feed material and is advisable.But the extra baking operation increased, adds energy consumption with artificial, have impact on production efficiency.
Utility model content
The utility model object is: for above-mentioned Problems existing, a kind of ball mill is provided, adopt the novel structure of this ball mill, can according to need of production, strengthen flow, the flow velocity of air-flow in grinder, and in turn ensure that material has sufficient milling time in grinder, thus take into account end product quality and output.
The technical scheme of the improvement that the utility model adopts is as follows: it comprises ball grinding cylinder, collecting bin; Collecting bin one end is communicated with ball grinding cylinder by the grate plate that delivers from godown; Collecting bin other end top is connected with blower fan by airduct, and bottom leads to charge tube and communicates with material storehouse; Also be provided with induced duct in described collecting bin, induced duct one end is stretched in ball grinding cylinder, and the other end stretches in airduct, is provided with deep bead between induced duct and airduct or collecting bin; Collecting bin housing is provided with air-vent.
Adopt modified node method of the present utility model, enter the air of ball grinding cylinder, respectively from the air inlet of ball grinding cylinder front portion, and the air-vent of the collecting bin at ball grinding cylinder rear portion, due to the lock wind effect of deep bead, make the air at rear portion enter collecting bin from air-vent and enter ball grinding cylinder by the grate plate that delivers from godown again, form front and rear part air intake simultaneously; The port air draught (exhausting) of one end of ball grinding cylinder is stretched into from induced duct, then from the other end air draft of induced duct.The flow direction of air-flow is different from the single type of flow gone out after the advance of prior art, air-flow direction in ball grinding cylinder of the present utility model is except the air-flow gone out after remaining original advance, also add the air current flow of the grate plate air intake that to be delivered from godown by ball grinding cylinder rear portion, consequent beneficial effect is:
1. can overcome the drawback that former exhausting mode cannot adopt Wind Volume.
When strengthening the draft of exhausting system, increase the suction (draft) that induced duct stretches into one end of ball grinding cylinder, the air-flow velocity in ball grinding cylinder is accelerated, and by the discharge rate of steam improved greatly in ball grinding cylinder, reduces ball milling temperature.And material is when entering collecting bin by the grate plate that delivers from godown, due to the air intake passage that the grate plate that delivers from godown also is rear portion simultaneously, Flow of Goods and Materials direction is relative with air intake direction, and Flow of Goods and Materials speed is obstructed, and forces the speed of Flow of Goods and Materials can not increase due to the increase of air exhauster draft.Thus ensure that while discharging moisture content in time, effectively ensure that the milling time of material in ball grinding cylinder, improve product quality, drawback during former exhausting mode Wind Volume is all overcome by temperature during large exhausting amount reduction ball milling.
2. improve ball mill operating mode, increase the grinding efficiency of abrasive body, improve output.
Because ball grinder interior temperature reduces, steam is discharged in time, and reduce and even do not adsorb (sticking with paste mill) generation, abrasive body surface is more totally smooth, abrasive body can be improved and do useful work (during Electrostatic Absorption, thinner material is more easily adsorbed on abrasive body surface, just creates its adsorption material and is worn away and the vicious circle of adsorbing, so repeatedly flog a dead horse) efficiency, improve ball mill operating mode, increase grinding efficiency, improve output, reduce energy consumption.
3. improve the grindability of material.
Material grindability is that temperature is more low better, and reduce owing to grinding interior temperature, temperature of charge also decreases, and its grindability is corresponding improvement also.
4. adapt to flood serving material ability strong, reduce or exempt material drying operation.
Moisture content is comparatively fast converted into steam with the fricative heat energy of abrasive body, is taken out of thereupon by Wind Volume after entering mill by flood serving material.Through experiment, the comprehensive moisture content of mill feed material (at the extra-high moisture content of former exhausting mode subordinate, almost cannot be produced) between 4%-8% all can maintain normal yield and quality.
5. equipment is simple, and easy for installation, improvement cost is low, and can switch rapidly exhausting mode.
New equipment installs the space all utilized in the collecting bin of original equipment, does not destroy original system, and install transformation simply, within 1 day, can complete installation, improvement cost is low.If needed (as only roughly ground material), only need the deep bead removed between induced duct and airduct, and shutoff air-vent, former mode can be switched to rapidly and produce.
Further improvement is, described air-vent is provided with air inlet adjustment valve.Control valve can regulate the size from rear portion intake, namely regulates flow and the flow velocity of the air-flow relative with Flow of Goods and Materials direction, thus reaches and adjust material and to deliver from godown the speed of grate plate.By controlling material flow, adjusting it and resting on the time polished in ball milling body, better control material finish fineness.
Further improvement is, the air inlet that ball mill front portion is arranged also is provided with air inlet adjustment valve.By regulating the control valve in air port, front and back, obtain different anterior air inlets and the air quantity of rear portion air inlet, coordinate the adjustment of exhausting draft again, the adjustment of the gas flow to relative broad range in ball mill, flow velocity can be realized, to meet the needs of any material grinding technics in ball mill, the effect of the cooling thus the air draft realizing reaching the best is dried, the optimum flow rate that can obtain again different material fineness (granularity) controls.
Further improvement is, described induced duct is three-way pipe, and first end stretches in ball grinding cylinder, and the second end stretches in airduct, and the 3rd end is stretched in feeding pipe, and the 3rd end top of induced duct is provided with gravity mechanical seal member.In the process of Long-Time Service, the amount of powder of ball mill inner suspension will be extracted out by exhausting system and is concentrated at three pipe intersection depositions of induced duct, will affect the draft of exhausting system.And adopt this structure of the present utility model, when powder accumulation is more, under the Action of Gravity Field of powder, the diaphragm seal of gravity mechanical seal member is opened downwards, powder leads to charge tube along the 3rd end of induced duct and enters material storehouse, both can avoid feed blocking induced duct, turn improve the rate of recovery of material.When material reduces, diaphragm seal restores, and recovers air-tight state between induced duct and material pipe.
Further improvement is, also comprises dust pipe, and dust pipe one end is arranged on induced duct first end bottom, and the other end extends to abrasive areas in ball grinding cylinder, and dust pipe has aperture.In ball grinding cylinder, reaching through abundant grinding the material that grind size requires, and also not ground together with qualified thicker mixing of materials, if continue grinding, by producing powder phenomenon, having affected grinding efficiency.By the aperture of dust pipe, the high pressure draught of outside is spurted in abrasive areas, will ground particulate powders is inspired be suspended in air, thus taken away by exhausting system, filtered by dust-precipitator and enter material storehouse, achieve being separated of fine grained and coarse granule material, improve grinding efficiency, decrease grinding phenomenon.
Further improvement is, induced duct first end top is provided with deashing pipe, deashing pipe has aperture.The high pressure pneumatic conveying device for gasjet of deashing Guan Keyu outside is connected.In the process of Long-Time Service, the part fine powder of ball mill inner suspension will be extracted out by exhausting system and partly be deposited in the tube wall place of the first end of induced duct, will affect the draft of exhausting system.As required, open high pressure pneumatic conveying device for gasjet, gases at high pressure are sprayed by the aperture of deashing pipe, the material powders piled up by tube wall is inspired, thus taken away recovery by exhausting system, add material casting yield, in turn ensure that the guarantee of the unimpeded of exhausting system and draft.
Further improvement is, the front end, one end that described induced duct stretches into ball grinding cylinder is horn mouth shape.Bell-mouthed outward flange exhausting wind speed is less than the wind speed in horn mouth heart portion, the powder of too thin material and the granularity that meets the requirements is taken away by exhausting system, filtered by dust-precipitator and enter material storehouse, that can reduce material to a certain extent crosses grinding phenomenon, improves grinding efficiency.And it is less due to draft at the outward flange of suction opeing also not grind material thicker fully, can not be pumped.
Further improvement is, described induced duct stretches into one end bending in ball grinding cylinder.
Because the material in ball mill and abrasive body do centrifugal projectile motion along the direction of rotation of ball mill in ball grinding cylinder, when these parts are installed, one end that induced duct stretches in ball grinding cylinder is bent to ball mill direction of rotation, namely the centrifugal parabolic direction of motion to material and abrasive body bends, and can avoid and reduce material, grinder to the shock of induced duct and wearing and tearing.
Further improvement is, one end that induced duct stretches into ball grinding cylinder is coated with wearing layer.Can touch induced duct unavoidably in the process that the abrasive body rotated in ball grinding cylinder and material fall under rotation, coated one deck wearing layer, can increase the service life of induced duct.
Further improvement is, described induced duct stretches into ball grinding cylinder inner tubal wall outer setting to be had and relative with grate plate air intake direction of delivering from godown spread aerofoil.Especially can be pumped by the very fast port from induced duct near the part of induced duct from the grate plate air intake that delivers from godown at ball mill rear portion, be not fully utilized, and spread aerofoil by setting, and can the air intake water conservancy diversion at rear portion to delivering from godown the part of grate plate away from induced duct, especially some dead angles.Logical wind action is mainly played on the deliver from godown top of grate plate, by spreading aerofoil, can make grate plate top part especially some dead angle temperature reductions away from induced duct of delivering from godown, steam is pulled away, avoid moist material can adhere to stifled grate seam, better ensure the performance of ventilating in ball grinding cylinder.The deliver from godown bottom of grate plate mainly ensures that material can flow into collecting bin smoothly.And spread aerofoil, can by rear portion air intake evenly guiding material, reduce temperature of charge, strengthen air circulation, be conducive to the discharge of steam, material thinner for granularity can also be blown and raise, suspend, taken away by exhausting system, filtered by dust-precipitator and enter material storehouse, that can reduce material to a certain extent crosses grinding phenomenon, improves grinding efficiency.
Further improvement is, Qian Cang and Hou Cang is divided into by grate plate used for isolating bin in the ball grinding cylinder of described ball mill, there is a circular hole at the middle part of grate plate used for isolating bin, wind becomes post stream wind (i.e. anterior air intake) after storehouse enters rear storehouse by middle part circular hole in the past, circular hole rear portion is provided be connected with grate plate used for isolating bin relative with the anterior air intake direction of ball mill and spreads aerofoil, the grate of the air intake water conservancy diversion of front portion to the grate plate used for isolating bin away from post stream air port can be stitched and inwall, especially some dead angles.Dead angle temperature can be reduced, steam is taken away, avoid moist material can adhere to stifled grate seam and inwall, better ensure the performance of ventilating in ball grinding cylinder.The bottom of grate plate used for isolating bin mainly ensures that material can flow into rear storehouse in the past storehouse smoothly, spread aerofoil can by anterior air intake evenly guiding material, reduce temperature of charge, strengthen air circulation, be conducive to the discharge of steam, material thinner for granularity can also be blown and raise, suspend, taken away by exhausting system, filtered by dust-precipitator and enter material storehouse, that can reduce material to a certain extent crosses grinding phenomenon, improves grinding efficiency.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the ball mill structural representation of the utility model prior art.
Fig. 2 is the ball mill structural representation of the utility model embodiment.
Fig. 3 is the structural representation of the utility model induced duct.
Fig. 4 is the top view of Fig. 3.
Fig. 5 is that the grate plate place that delivers from godown of the present utility model arranges the wind-guiding schematic diagram spreading aerofoil.
Fig. 6 is that grate plate used for isolating bin place of the present utility model arranges the wind-guiding schematic diagram spreading aerofoil.
Detailed description of the invention
All features disclosed in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.Arbitrary feature disclosed in this description (comprising any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Ball mill as shown in Figure 2, comprises ball grinding cylinder 8, collecting bin 9, and ball grinding cylinder is divided into Qian Cang and Hou Cang by grate plate used for isolating bin 19; Collecting bin one end is communicated with ball grinding cylinder by the grate plate 4 that delivers from godown; Collecting bin other end top is connected with blower fan by airduct 5, and the bottom of the collecting bin other end leads to charge tube 6 and communicates with material storehouse; Also be provided with threeway induced duct as shown in Figure 3,4 in described collecting bin, the front end of a siphunculus 15 is stretched in horn mouth shape in ball grinding cylinder 8, and to the bending of ball mill direction of rotation, siphunculus 15 top is provided with high pressure deashing pipe 12, and deashing pipe has aperture; The bottom of one siphunculus arranges dust pipe 21, and dust pipe extends to abrasive areas in ball grinding cylinder, and dust pipe has aperture.Bipass 16 rear portion is stretched in airduct 5; Three-way pipe 17 bottom communicates with material pipe 6, and three-way pipe top is provided with gravity mechanical seal member 13.Space between induced duct and airduct is provided with deep bead 11; Collecting bin housing is provided with air-vent (not shown), the air inlet 1 of ball grinding cylinder front end and the air-vent place of collecting bin are provided with intake control valve (10,14).
Adopt the ball mill of the utility model embodiment, define the air supply mode of the grate plate air intake that delivers from godown from ball grinding cylinder front and rear.The suction opeing of induced duct is arranged in ball grinding cylinder, and the gas in ball grinding cylinder is discharged by induced duct, strengthens the draft of exhaust column, thus the water vapour in ball grinding cylinder is taken away rapidly, and reduces ball milling temperature fast.And the material in ball grinding cylinder is when entering collecting bin from the grate plate that delivers from godown, be subject to the gas barrier entered by the grate plate that delivers from godown in collecting bin in ball grinding cylinder, by regulating air inlet adjustment valve, material can be controlled to deliver from godown the speed of grate plate, adjust it and rest on the time polished in ball milling body, the material finish fineness needed for acquisition.
As shown in Figure 5,6, in order to improve the performance of ventilating in ball grinding cylinder, the utility model preferred embodiment is that the tube wall outer setting stretched in ball grinding cylinder at induced duct one siphunculus 15 has and relative with grate plate 4 air intake direction of delivering from godown spreads aerofoil 18.Center hole 20 rear portion of grate plate used for isolating bin 19 is provided be connected with grate plate used for isolating bin relative with the anterior air intake direction of ball mill and spreads aerofoil 22.Before and after spread aerofoil and can carry out water conservancy diversion to front and back air intake, make air flow guide grate plate used for isolating bin and the far-end of the grate plate that delivers from godown and dead angle, improve the performance of ventilating of this part, reduce temperature, take away steam, avoid moist material can adhere to stifled grate seam.Spread aerofoil and can also reduce temperature of charge, strengthen the air circulation of abrasive areas, be beneficial to the discharge of steam, particularly material levigate for abrasive areas can also be blown and raise, suspend, collect warehouse-in by exhausting system, improve grinding efficiency.
Specification is adopted to be 3.2 meters of * 16 meters of ball mills, grinding material cement, lapping mode: dry grinding.The grinding Data Comparison of the ball mill of the utility model ball mill and prior art following (unless otherwise indicated, the processing parameter of employing is all identical, and institute grinds the finished product materials of putting in storage and meets technological requirement):
As can be seen from correction data, when cement water content is lower, prior art can realize good ball milling effect, but in order to obtain lower water content, usually needs material drying before ball milling.If not material drying, when cement water content is too high, will engender and stick with paste mill phenomenon, grinding effect of abrasive body declines, in order to ensure that material obtains grinding fully, have to reduce exhausting draft, to ensure the milling time of material, but conversely, make again the performance of ventilating in ball grinding cylinder poorer, grinding operating mode is worse, finally causes ball mill to shut down, just can resume production after carrying out artificial treatment.When water content reaches 8%, existing ball mill can not be produced substantially.Adopt ball mill of the present utility model, when material moisture reaches 4%, also with the material grinding efficiency of the low water content of prior art close to even higher, even if material moisture is higher by 8%, still can obtain higher output, and grinding material satisfactory quality.And along with grinding the improvement of operating mode in ball mill, grinding efficiency improves, and platform output increases thereupon.Ball grinding cylinder is checked in grinding end, does not substantially stick with paste mill phenomenon in cylinder, and the grate seam of grate plate used for isolating bin, the grate plate that delivers from godown does not have feed blocking substantially, and the liner plate of abrasive body surface and barrel is totally smooth.
Although in order to ensure to have carried out example and description according to preferred embodiment to the utility model, it should be understood that the utility model is not limited to aforesaid detailed description of the invention.Do not deviating from the situation of the present utility model set forth in claims, can make this and change and change, the utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (11)
1. a ball mill, comprises ball grinding cylinder, collecting bin; Collecting bin one end is communicated with ball grinding cylinder by the grate plate that delivers from godown; Collecting bin other end top is connected with blower fan by airduct, and bottom leads to charge tube and communicates with material storehouse; It is characterized in that, be also provided with induced duct in described collecting bin, induced duct one end is stretched in ball grinding cylinder, and the other end stretches in airduct, is provided with deep bead between induced duct and airduct or collecting bin; Collecting bin housing is provided with air-vent.
2. ball mill according to claim 1, is characterized in that: described air-vent is provided with intake control valve.
3. ball mill according to claim 2, is characterized in that: the air inlet that ball mill front portion is arranged has intake control valve.
4. ball mill according to claim 1, is characterized in that: described induced duct is three-way pipe, and first end stretches in ball grinding cylinder, and the second end stretches in airduct, and the 3rd end is stretched in feeding pipe, and the 3rd end top of induced duct is provided with gravity mechanical seal member.
5. the ball mill according to the arbitrary claim of claim 1-4, is characterized in that: also comprise dust pipe, and dust pipe one end is arranged on induced duct first end bottom, and the other end extends to abrasive areas in ball grinding cylinder, and dust pipe has aperture.
6. the ball mill according to the arbitrary claim of claim 1-4, is characterized in that: also comprise the deashing pipe being arranged on induced duct first end top, deashing pipe has aperture.
7. the ball mill according to the arbitrary claim of claim 1-4, is characterized in that: the front end, one end that described induced duct stretches into ball grinding cylinder is horn mouth shape.
8. the ball mill according to the arbitrary claim of claim 1-4, is characterized in that: described induced duct stretches into one end bending in ball grinding cylinder.
9. ball mill according to claim 8, is characterized in that: one end that induced duct stretches into ball grinding cylinder is coated with wearing layer.
10. the ball mill according to the arbitrary claim of claim 1-4, is characterized in that: described induced duct stretches into ball grinding cylinder inner tubal wall outer setting to be had and relative with grate plate air intake direction of delivering from godown spread aerofoil.
11. ball mills according to the arbitrary claim of claim 1-4, it is characterized in that: is divided into Qian Cang and Hou Cang by grate plate used for isolating bin in the ball grinding cylinder of described ball mill, the center hole rear portion of grate plate used for isolating bin is provided be connected with grate plate used for isolating bin relative with the anterior air intake direction of ball mill and spreads aerofoil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420607310.5U CN204074182U (en) | 2014-10-17 | 2014-10-17 | A kind of ball mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420607310.5U CN204074182U (en) | 2014-10-17 | 2014-10-17 | A kind of ball mill |
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| Publication Number | Publication Date |
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| CN204074182U true CN204074182U (en) | 2015-01-07 |
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ID=52166948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420607310.5U Withdrawn - After Issue CN204074182U (en) | 2014-10-17 | 2014-10-17 | A kind of ball mill |
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| Country | Link |
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| CN (1) | CN204074182U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104258942A (en) * | 2014-10-17 | 2015-01-07 | 张沁玥 | Ball mill |
| CN105251570A (en) * | 2015-09-09 | 2016-01-20 | 安徽省葛根生产力促进中心有限公司 | Highly-strong ventilation construction equipment used for producing highly-fine cement milled powder |
| CN110404632A (en) * | 2019-07-08 | 2019-11-05 | 张沁玥 | A kind of building castoff regeneration method and application |
-
2014
- 2014-10-17 CN CN201420607310.5U patent/CN204074182U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104258942A (en) * | 2014-10-17 | 2015-01-07 | 张沁玥 | Ball mill |
| CN104258942B (en) * | 2014-10-17 | 2016-05-04 | 张沁玥 | Ball mill |
| CN105251570A (en) * | 2015-09-09 | 2016-01-20 | 安徽省葛根生产力促进中心有限公司 | Highly-strong ventilation construction equipment used for producing highly-fine cement milled powder |
| CN110404632A (en) * | 2019-07-08 | 2019-11-05 | 张沁玥 | A kind of building castoff regeneration method and application |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150107 Effective date of abandoning: 20160504 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |