CN208018783U - Intelligent vertical permanent-magnet drum type magnetic separator - Google Patents
Intelligent vertical permanent-magnet drum type magnetic separator Download PDFInfo
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- CN208018783U CN208018783U CN201820897409.1U CN201820897409U CN208018783U CN 208018783 U CN208018783 U CN 208018783U CN 201820897409 U CN201820897409 U CN 201820897409U CN 208018783 U CN208018783 U CN 208018783U
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- outer barrel
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- concentrate
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Abstract
The utility model is related to a kind of intelligent vertical permanent-magnet drum type magnetic separators comprising the bottom of outer barrel, spill box and concentrate bucket, spill box offers tailing mouth；The inside of outer barrel is equipped with central shaft, permanent magnetic system and inner cylinder；The lower part of outer barrel is arranged with annular water chamber, and annular water chamber is externally connected to water inlet pipe, and the barrel border of outer barrel offers multiple flush ports being connected to annular water chamber；Ore pulp import is opened up in the middle part of outer barrel, supporting rack is arranged in the top of outer barrel, and the top of central shaft is rotatably installed on supporting rack, and central shaft driving motor is equipped on supporting rack；Permanent magnetic system is fixedly mounted on the lower part of central shaft, and inner cylinder is rotatably installed in the lower part of central shaft and enters permanent magnetic system seal closure in cylinder, and inner cylinder driving motor is equipped on supporting rack.The utility model has the advantages that stable structure, the efficiency of separation are high, sealing effect is good and high degree of automation, effectively increases the reliability of equipment and the grade of concentrate.
Description
Technical field
The utility model is related to preparation equipment field, specifically a kind of intelligent vertical permanent magnet drum magnetic separator.
Background technology
The silicon and nonmetallic mineral impurity that magnetic separator is used to adulterate iron powder are rejected, to improve the grade of iron powder.This case Shen
It asks someone to be dedicated to the R & D design of magnetic separator for many years, and successively applies and obtain more than one piece patent.Such as a kind of " column magnetic separator permanent magnetism
Magnetic system "（Patent No. ZL201420496415.8）, realizing iron powder for the first time in magnetic separator field can be in cylinder surface continuous axial
Spiral moves." the permanent-magnet concentration column " that above-mentioned magnetic system is applied to invent（Patent No. ZL201410015771.8), and the bottom of to
Portion's centrum taper and ore discharge valve and magnetic system field strength distribution etc. are improved, and " vertical chosen elutriation integral type permanent-magnet magnetic is formd
Select machine "（Patent No. ZL201520856476.5), it is proved through long-term operative practice, under identical operating mode, the permanent magnetic separator ratio
Electromagnetism column magnetic separator energy consumption smaller, 50% or more water-saving, rate of recovery higher and iron concentrate grade higher, and Iron concentrate concentration is reachable
70 and the advantages such as concentrate bottom valve is not stifled, considerable economic benefit is brought to user.To play equipment performance to greatest extent, improve
Separating effect and raising production capacity reach energy-saving and emission-reduction purpose.
It is that magnetic system is motionless in above-mentioned patent, cylinder skin rotates, that is, the machine driving that central shaft fixed cylinder skin rotates
Pattern.To increase production capacity, it is necessary to accelerate cylinder epidermis face iron powder travelling speed, if increasing cylinder skin rotating speed merely, thus cause point
It selects the rotation flow-disturbing speed of intracavitary ore pulp to increase, epidermis face magnetic material centrifugal force is caused to increase；It is hindered simultaneously far from magnet drum
And by the fine magnetic-particle of magnet drum magnetic force attraction close to cylinder skin, tail increase drawback is run to cause the rate of recovery to reduce；Have again
It selecting and is limited by working condition in factory's flow, mine-supplying quantity and feed ore concentration fluctuate larger and influence the equipment rate of recovery and concentrate grade,
Therefore mine working condition must be given according to scene, equipment separation operation is effectively automatically controlled.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of more rational mechanical structures, and it is reliable to improve equipment
Property and improve single device efficiency of magnetic separation, and can according to mine working condition change, realize sorting automatically control, improve recycling
Rate stablizes the vertical permanent magnet drum magnetic separator of concentrate grade.
In order to solve the above technical problems, the intelligent vertical permanent-magnet drum type magnetic separator of the utility model includes the outer of top opening
Cylinder, the spill box at the top of outer barrel and the concentrate bucket for being connected to outer barrel bottom, the bottom of spill box offer tail
Mine mouth；The inside of outer barrel is equipped with central shaft, permanent magnetic system and inner cylinder；The lower part of outer barrel is arranged with annular water chamber, ring
Shape water cavity is externally connected to water inlet pipe, and the barrel border of outer barrel offers multiple flush ports being connected to annular water chamber；Outside
Ore pulp import is opened up in the middle part of cylinder, is structurally characterized in that the top setting supporting rack of the outer barrel, the top of central shaft turns
Dynamic to be mounted on supporting rack, the lower part of central shaft is stretched into outer barrel, is equipped on supporting rack and is connected with the top power of central shaft
The central shaft driving motor connect；Permanent magnetic system is fixedly mounted on the lower part of central shaft, and inner cylinder is rotatably installed under central shaft
Portion simultaneously enters permanent magnetic system seal closure in cylinder, is equipped on supporting rack and drives electricity with the inner cylinder of the top be connected by power of inner cylinder
Machine.
The magnetic separator further includes one external to mine case, penetrated from the center of babinet bottom wall to the inlet tube of mine case and by
The position cut-off on nearly babinet top, the circumferential interval of babinet bottom wall open up multiple feed ports；The ore pulp import is in outer barrel
Border opens up multiple, and each feed port is correspondingly connected with by hose and each ore pulp import respectively.
The bottom to mine case is placed in support platform, support platform and is equipped with pressure sensing between mine case
Device.
Concentrate flow meter is installed in the concentrate bucket, automatically controlled concentrate valve is installed in the bottom end outlet of concentrate bucket；Water inlet
Water ga(u)ge and automatically controlled inlet valve are installed on pipe；Tailings concentration sensor, concentrate flow meter, water flow are installed in spill box
Meter, tailings concentration sensor and pressure sensor signal output end be electrically connected with a PLC controller, each electrically-controlled valve and respectively
The control terminal of driving motor is electrically connected with the control output end of PLC controller.
The central shaft driving motor is mounted on the top of supporting rack, and the power output end of central shaft driving motor is connected with
Speed reducer, the top of central shaft and the output end of speed reducer connect.
The inner cylinder driving motor is mounted on the side of supporting rack, and the power output end of inner cylinder driving motor is equipped with
The top of driving pulley, inner cylinder is equipped with driven pulley, and belt is connected between driving pulley and driven pulley.
The utility model has following several advantageous effects, is made a concrete analysis of below.
1）Inner cylinder is rotatably installed in the lower part of central shaft, and the bottom end seal of central shaft is in inner cylinder, with external point
It selects chamber to be isolated, pervious shaft mechanical seal problem is not present, to considerably increase the service life and reliability of equipment, simplify
Mechanical structure；In addition, the permanent magnetic pulley integral hanging that central shaft is formed together with inner cylinder eliminates in outer barrel to inner cylinder
The lower support structure of body and/or central shaft, and can be so that the taper concentrate bucket and flush port that outer barrel lower end is connected with it
Water conservancy cyclone structure is formed, the further sorting of all interior concentrate powder of taper concentrate is more advantageous to.
2）The permanent magnetic system that central shaft drives is rotated by different driving mechanisms in opposite direction respectively from inner cylinder,
In the case where not increasing inner cylinder rotating speed（If improving separation velocity by the rotating speed for increasing inner cylinder, can increase point
The flow-disturbing of intracavitary is selected, separating effect is reduced）, accelerate iron powder moves down speed, increases the separation velocity of equipment, also
It is to say the treating capacity for increasing equipment, improves the efficiency of separation.
3）It is separately provided and gives mine case, setting is multiple to be gone out mine mouth and to convey to each ore pulp inlets even of host respectively using hose
Ore pulp need not be arranged annular to mine chamber on outer barrel, and to simplify the structure of equipment barrel, the installation of equipment barrel is torn open
Unload more flexible convenience.Meanwhile the structure of center inlet pipe is used to mine case, it can be uniformly distributed charging in sorting chamber, improved
Separating effect.
4）The live signal that each sensor is acquired using PLC controller controls inflow and concentrate respectively by electrically-controlled valve
Inflow and concentrate ore discharge speed is adjusted so as to the variation according to mine-supplying quantity size and tailings concentration in discharge.To mine
Pressure sensor below case, reaction be mine-supplying quantity size, according to mine-supplying quantity control inflow, if feed ore concentration has change
Change, tailings concentration size variation situation is detected with concentration sensor in tailing tank, further corrects confluent size, make sorting
Intracavitary pulp density tends to constant suitable concentration, is effectively sorted under this operating mode, to obtain the concentrate of grade stabilization
Powder；Concentrate accumulating amount size can be learnt in time using all interior concentrate pressure sensor of vertebra shape concentrate, prevent from blocking out mine mouth, together
Shi Wending centrum inward eddy operating modes are conducive to the further sorting purification to concentrate powder.
In conclusion the utility model has, stable structure, the efficiency of separation are high, sealing effect is good and high degree of automation
Advantage effectively increases the reliability of equipment and the grade of concentrate.
Description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the principle schematic diagram of the utility model.
Specific implementation mode
With reference to attached drawing, the intelligent vertical permanent-magnet drum type magnetic separator of the utility model includes the outer barrel 1 of top opening, installation
Spill box 2 at 1 top of outer barrel and the concentrate bucket 3 for being connected to 1 bottom of outer barrel, the bottom of spill box 2 offers tailing mouth
5；The inside of outer barrel 1 is equipped with central shaft 6, permanent magnetic system 7 and inner cylinder 8；The lower part of outer barrel 1 is arranged with annular water chamber 9,
Annular water chamber 9 is externally connected to water inlet pipe 10, and the barrel border of outer barrel 1 offers multiple to be rushed with what annular water chamber 9 was connected to
The mouth of a river 11；The middle part of outer barrel 1 opens up ore pulp import 12, and supporting rack 13 is arranged in the top of outer barrel 1, and the top of central shaft 6 turns
Dynamic to be mounted on supporting rack 13, the lower part of central shaft 6 is stretched into outer barrel 1, and the top with central shaft 6 is equipped on supporting rack 13
The central shaft driving motor 14 of be connected by power；Permanent magnetic system 7 is fixedly mounted on the lower part of central shaft 6, and inner cylinder 8 is rotatably installed in
The lower part of central shaft 6 simultaneously enters 7 seal closure of permanent magnetic system in cylinder, is equipped on supporting rack 13 and connects with the top power of inner cylinder 8
The inner cylinder driving motor 28 connect.
Wherein, for the driving structure of central shaft, central shaft driving motor 14 is mounted on the top of supporting rack 13, central shaft
The power output end of driving motor 14 is connected with speed reducer 15, and the top of central shaft 6 is connect with the output end of speed reducer 15.For
The driving structure of inner cylinder, inner cylinder driving motor 8 are mounted on the side of supporting rack 13, and the power of inner cylinder driving motor 8 is defeated
Outlet is equipped with driving pulley, and the top of inner cylinder 8 is equipped with driven pulley 27, is connected between driving pulley and driven pulley 27
There is belt 29.
In above structure, the bottom end of central shaft 6 is rotatablely connected with the base end wall of inner cylinder 8, and the bottom end quilt of central shaft 6
Bearing gland is sealed in bearing chamber, the top of central shaft 6 is rotatably installed on supporting rack, and 8 top of inner cylinder is fixedly connected with skin
Belt wheel 27, and connected through belt 29 by inner cylinder driving motor 28, driving inner cylinder 8 rotates；6 top of central shaft passes through supporting rack
26 endoporus of fixing bearing that 13 tablets are installed below, 15 assembly of central shaft driving motor 14 and speed reducer with washer installation
Be connected simultaneously anticreep, to drive permanent magnetic system 7 to rotate.Wherein, fixing bearing 26 plays the point action of stable central shaft 6.
Concrete structure for permanent magnetic system and magnetic separation principle, in entitled " a kind of permanent-magnet concentration column magnetic system "（The patent No.
ZL201420496415.8）Patent in be described in detail, details are not described herein.
With reference to attached drawing, which further includes one external to mine case 22, to mine case 22 inlet tube 23 from babinet bottom wall
Center penetrate and end in the position close to babinet top, the circumferential interval of babinet bottom wall opens up multiple feed ports 24；It is described
Ore pulp import 12 opens up multiple in the border of outer barrel 1, and each feed port 24 is corresponding with each ore pulp import 12 by hose 30 respectively
Connection.
It with reference to attached drawing, is placed in support platform, support platform and is equipped between mine case 22 to the bottom of mine case 22
Pressure sensor 25.
With reference to attached drawing, concentrate flow meter 16 is installed in concentrate bucket 3, automatically controlled essence is installed in the bottom end outlet of concentrate bucket 3
Mine valve 4；Water ga(u)ge 17 and automatically controlled inlet valve 18 are installed on water inlet pipe 10；Tailings concentration sensor is installed in spill box 2
19, concentrate flow meter 16, water ga(u)ge 17, tailings concentration sensor 19 and pressure sensor 25 signal output end with one
Control output end of the control terminal of the electrical connection of PLC controller 20, each electrically-controlled valve and each driving motor with PLC controller 20 is electrically connected
It connects.
The operation principle of the utility model is：Ore pulp to be selected enters via inlet tube 23 first gives the simultaneously overflow of mine case 22, etc.
Material distribution is uniformly entered sorting chamber by several hoses 30 of diameter, and iron powder is adsorbed on 8 outer wall of inner cylinder under the force effect of magnetic system magnetic field,
Inner cylinder driving motor 28 drives inner cylinder 8 to be rotated with appropriate speed, and iron powder is axial quickly downward along the outer wall spiral of inner cylinder 8
Rolling jump movement, flushing water negative direction tangent line after automatically controlled inlet valve 18 and water ga(u)ge 17 enter annular water chamber 9, then from into
11 tangent line of the mouth of a river enters sorting chamber, and the flushing water of opposite direction washes away elutriation, clean concentrate to the concentrate powder on 8 wall of inner cylinder
Powder drops to centrum concentrate bucket 3, is most discharged afterwards through automatically controlled concentrate valve 4.While interior barrel body rotation, central shaft driving motor 14
Also drive permanent magnetic system 7 reversely to be rotated with appropriate speed with inner cylinder 8, magnetic system and cylinder skin relative to negative direction rotation, do not increasing
Add under 8 speed conditions of inner cylinder, accelerate iron powder moves down speed, increases the separation velocity of equipment, that is to say, that increase
The treating capacity of equipment is added.It is flowed out in weak magnetic and nonmagnetic miberal powder overflow to spill box 2 and through tailing mouth, completes sorting and make
Industry.
Intelligent automatic control principle is：The size that mine-supplying quantity is measured to the pressure sensor 25 of 22 bottom of mine case, with voltage
Aspect is transferred to PLC controller 20, and PLC controller 20 controls the positive and negative rotation of 18 motor of automatically controlled inlet valve according to mine-supplying quantity,
So as to adjust valve opening size, to adjust inflow, water ga(u)ge 17 is according to the uninterrupted for entering water, output signal feedback
To PLC controller 20, instant flow number is informed；And since input raw ore slurry concentration changes, gravity treatment in sorting chamber can be caused
The variation of concentration working condition, the tailings concentration sensor 19 in overflow launder 2 measure its concentration variable quantity, measured signal are transmitted
To PLC controller 20, confluent is needed to increase or reduce to correct, the automatically controlled inlet valve of secondary control 18 again of PLC controller 20
Aperture adjusts suitable confluent to stablize pulp density in sorting chamber；Concentrate pressure sensor in vertebra shape concentrate bucket 4 measures
Numerical value, reaction be concentrate accumulating amount size, be transferred to PLC controller 20, control automatically controlled concentrate valve 4, it is big to change ore discharge amount
It is small, so that concentrate powder in centrum is maintained at certain amount, to ensure that hydrocyclone function further purifies concentrate powder.It can
See, by automation control, realize according to mine-supplying quantity number, confluent and concentrate discharge capacity are controlled, to stablize in sorting chamber
The purpose of gravity treatment and device bottom water conservancy rotational flow sorting working condition.
In conjunction with above-mentioned specific implementation mode, the utility model has following several advantageous effects, is made a concrete analysis of below.
1）Inner cylinder 8 is rotatably installed in the lower part of central shaft 6, and the bottom end seal of central shaft 6 is in inner cylinder 8, with outside
Sorting chamber isolation, be not present pervious shaft mechanical seal problem, to considerably increase the service life and reliability of equipment,
Simplify mechanical structure；In addition, the permanent magnetic pulley integral hanging that central shaft 6 is formed together with inner cylinder 8 saves in outer barrel 1
To the lower support structure of inner cylinder 8 and/or central shaft 6, and can be so that the taper concentrate that outer barrel 1 lower end is connected with it
Bucket 3 and flush port 11 form water conservancy cyclone structure, are more advantageous to the further sorting of all interior concentrate powder of taper concentrate.
2）The permanent magnetic system 7 that central shaft 6 drives is turned by different driving mechanisms in opposite direction respectively from inner cylinder 8
It is dynamic, in the case where not increasing by 8 rotating speed of inner cylinder（If improving separation velocity by increasing the rotating speed of inner cylinder 8, can add
Flow-disturbing in big sorting chamber, reduces separating effect）, accelerate iron powder moves down speed, increases the separation velocity of equipment,
Namely the treating capacity of equipment is increased, improve the efficiency of separation.
3）Be separately provided to mine case 22, setting it is multiple go out mine mouth 24 and equal to each ore pulp import of host respectively using hose 30
Even transfer ore pulp need not be arranged annular to mine chamber, to simplify the structure of equipment barrel, equipment barrel on outer barrel 1
The more flexible convenience of installing and dismounting.Meanwhile the structure of center inlet pipe 23 is used to mine case 22, it can be uniformly distributed in sorting chamber
Charging, improves separating effect.
4）The live signal that each sensor is acquired using PLC controller 20 controls inflow and essence respectively by electrically-controlled valve
Inflow and concentrate ore discharge speed is adjusted so as to the variation according to mine-supplying quantity size and tailings concentration in mine discharge.It gives
Pressure sensor 25 below mine case 22, reaction be mine-supplying quantity size, according to mine-supplying quantity control inflow, if feed ore concentration
It changes, tailings concentration size variation situation is detected with tailings concentration sensor in tailing tank 2, it is big further to correct confluent
It is small, so that pulp density in sorting chamber is tended to constant suitable concentration, is effectively sorted under this operating mode, it is steady to obtain grade
Fixed concentrate powder；Concentrate accumulating amount size can be learnt in time using the concentrate pressure sensor 16 in taper concentrate all 4, prevent from blocking up
Fill in mine mouth, Simultaneous Stabilization centrum inward eddy operating mode is conducive to the further sorting purification to concentrate powder.
The utility model is not limited to above-mentioned specific implementation mode.Those skilled in the art are not departing from the utility model
Under the premise of spirit and scope, several change or modification can be done.Above-mentioned change or modification each fall within the guarantor of this utility model
Protect range.
Claims (6)
1. a kind of intelligent vertical permanent-magnet drum type magnetic separator includes the outer barrel of top opening（1）, be mounted on outer barrel（1）Top
Spill box（2）Be connected to outer barrel（1）The concentrate bucket of bottom（3）, spill box（2）Bottom offer tailing mouth（5）；Outside
Cylinder（1）Inside central shaft is installed（6）, permanent magnetic system（7）And inner cylinder（8）；Outer barrel（1）Lower part be arranged with annular
Water cavity（9）, annular water chamber（9）Be externally connected to water inlet pipe（10）, outer barrel（1）Barrel border offer it is multiple with it is annular
Water cavity（9）The flush port of connection（11）；Outer barrel（1）Middle part open up ore pulp import（12）, it is characterized in that the outer barrel（1）
Top be arranged supporting rack（13）, central shaft（6）Top be rotatably installed in supporting rack（13）On, central shaft（6）Lower part stretch
Enter outer barrel（1）It is interior, supporting rack（13）On be equipped with and central shaft（6）Top be connected by power central shaft driving motor
（14）；Permanent magnetic system（7）It is fixedly mounted on central shaft（6）Lower part, inner cylinder（8）It is rotatably installed in central shaft（6）Lower part
And by permanent magnetic system（7）Seal closure enters in cylinder, supporting rack（13）On be equipped with and inner cylinder（8）Top be connected by power inner cylinder
Body driving motor（28）.
2. intelligent vertical permanent-magnet drum type magnetic separator as described in claim 1, it is characterized in that the magnetic separator further includes one external
Give mine case（22）, give mine case（22）Inlet tube（23）It penetrates from the center of babinet bottom wall and is cut in the position close to babinet top
Only, the circumferential interval of babinet bottom wall opens up multiple feed ports（24）；The ore pulp import（12）In outer barrel（1）Border open up
It is multiple, each feed port（24）Pass through hose respectively（30）With each ore pulp import（12）It is correspondingly connected with.
3. intelligent vertical permanent-magnet drum type magnetic separator as claimed in claim 2, it is characterized in that described give mine case（22）Bottom put
Set in support platform, support platform with give mine case（22）Between pressure sensor is installed（25）.
4. intelligent vertical permanent-magnet drum type magnetic separator as claimed in claim 3, it is characterized in that the concentrate bucket（3）Essence is inside installed
Mine flowmeter（16）, concentrate bucket（3）Bottom end outlet on automatically controlled concentrate valve is installed（4）；Water inlet pipe（10）On flow is installed
Gauge（17）With automatically controlled inlet valve（18）；Spill box（2）Tailings concentration sensor is inside installed（19）, concentrate flow meter（16）,
Water ga(u)ge（17）, tailings concentration sensor（19）And pressure sensor（25）Signal output end with a PLC controller
（20）Electrical connection, the control terminal of each electrically-controlled valve and each driving motor is and PLC controller（20）Control output end electrical connection.
5. intelligent vertical permanent-magnet drum type magnetic separator as described in claim 1, it is characterized in that the central shaft driving motor（14）
Mounted on supporting rack（13）Top, central shaft driving motor（14）Power output end be connected with speed reducer（15）, central shaft
（6）Top and speed reducer（15）Output end connection.
6. intelligent vertical permanent-magnet drum type magnetic separator as described in claim 1, it is characterized in that the inner cylinder driving motor（28）
Mounted on supporting rack（13）Side, inner cylinder driving motor（28）Power output end driving pulley, inner cylinder are installed
（28）Top driven pulley is installed（27）, driving pulley and driven pulley（27）Between be connected with belt（29）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897409.1U CN208018783U (en) | 2018-06-11 | 2018-06-11 | Intelligent vertical permanent-magnet drum type magnetic separator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897409.1U CN208018783U (en) | 2018-06-11 | 2018-06-11 | Intelligent vertical permanent-magnet drum type magnetic separator |
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| Publication Number | Publication Date |
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| CN208018783U true CN208018783U (en) | 2018-10-30 |
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ID=63910558
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701744A (en) * | 2019-01-18 | 2019-05-03 | 马钢集团矿业有限公司 | A kind of column magnetic separator autocontrol method and device |
| CN110000002A (en) * | 2019-05-14 | 2019-07-12 | 安徽高博过滤科技有限公司 | A kind of crane hydraulic oil cleaner |
| CN112007753A (en) * | 2020-08-21 | 2020-12-01 | 邯郸市睿冶矿山机械有限公司 | Automatic adjustment and control integrated control method for iron powder grade hoister |
-
2018
- 2018-06-11 CN CN201820897409.1U patent/CN208018783U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701744A (en) * | 2019-01-18 | 2019-05-03 | 马钢集团矿业有限公司 | A kind of column magnetic separator autocontrol method and device |
| CN110000002A (en) * | 2019-05-14 | 2019-07-12 | 安徽高博过滤科技有限公司 | A kind of crane hydraulic oil cleaner |
| CN110000002B (en) * | 2019-05-14 | 2023-09-29 | 安徽高博过滤科技有限公司 | Hydraulic oil filter for crane |
| CN112007753A (en) * | 2020-08-21 | 2020-12-01 | 邯郸市睿冶矿山机械有限公司 | Automatic adjustment and control integrated control method for iron powder grade hoister |
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