CN110538700A - Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill - Google Patents
Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill Download PDFInfo
- Publication number
- CN110538700A CN110538700A CN201910605542.4A CN201910605542A CN110538700A CN 110538700 A CN110538700 A CN 110538700A CN 201910605542 A CN201910605542 A CN 201910605542A CN 110538700 A CN110538700 A CN 110538700A
- Authority
- CN
- China
- Prior art keywords
- ball
- flange
- ball mill
- filling rate
- discharging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000227 grinding Methods 0.000 title claims abstract description 42
- 238000007599 discharging Methods 0.000 title claims abstract description 29
- 230000000903 blocking effect Effects 0.000 claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims description 10
- 229910052755 nonmetal Inorganic materials 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
- B02C17/1845—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone with return of oversize material to crushing zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to the field of overflow ball mills, in particular to a discharging device capable of improving the filling rate of ore grinding media of an overflow ball mill. Including the play feed cylinder, connect the drum sieve on the play feed cylinder and press from both sides the ball blocking device of establishing between play feed cylinder and drum sieve, the ball blocking device is including being used for the first flange that links to each other with play feed cylinder and drum sieve, the inner edge rigidity at first flange is equipped with the ball blocking plate, the sieve mesh has been seted up on the ball blocking plate, the sieve mesh can supply the ore pulp to pass and can block the ball grinding by the direction of play feed cylinder towards drum sieve by the orientation of play feed cylinder towards drum sieve, be equipped with on the inner wall of play feed cylinder and be used for the anti-spiral that the ball grinding that blocks by the ball blocking plate was carried towards mill barrel direction. The invention can solve the problem that the filling rate of the ore grinding medium of the overflow ball mill which is arranged at the core of the metal mine is low in the production process, and is suitable for the overflow ball mill which needs to obtain finer-grained minerals or higher yield by improving the filling rate of the ore grinding medium.
Description
Technical Field
The invention relates to the field of overflow ball mills, in particular to a discharging device capable of improving the filling rate of ore grinding media of an overflow ball mill.
Background
The overflow ball mill is the core equipment of a metal mine and is used for grinding ores from larger particles of about 100-15 mm into small particles of about 28-100 μm. Because the effective components of the minerals can be dissociated only under a specific small-particle-level state, the grinding effect of the ball mill has great influence on the metal recovery rate and benefit of the metal mine, and the improvement of the metal recovery rate of the metal mineral is also beneficial to the national policy of building green mines and saving-type mines.
With the increase in consumption of metal resources and the decrease in grade of metal mines in social development, the size increase of the ball mill specification is a trend in recent years. Indexes such as grindability or hardness of the ore fluctuate in the mining process (mining depth) of the ore, so that the negative influence of the ore difficult to grind on the yield is often overcome by improving the ore grinding medium filling rate of the ball mill in a concentrating mill, so that the yield of the ball mill can be improved by improving the ore grinding medium filling rate of the overflow ball mill under the condition of the structure permission of the mill, and further, greater economic benefit is obtained. But is limited by the structure of the mill, grinding balls in the mill flow out of a discharge port along with the ground ore pulp, so that the yield of the mill is reduced, and the ore grinding effect is poor.
Disclosure of Invention
The invention aims to provide a discharging device capable of improving the filling rate of an ore grinding medium of an overflow ball mill, solves the problem that the filling rate of the ore grinding medium of the overflow ball mill is low in the production process of a metal mine core device, and is suitable for the overflow ball mill which needs to obtain finer-grained minerals or higher yield by improving the filling rate of the ore grinding medium.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a can improve discharging device of overflow type ball mill grinding medium filling rate, install the play feed cylinder on ball mill ejection of compact side end cover including the cooperation, connect and keep away from the cylinder sieve of ball mill one end position on the play feed cylinder and press from both sides the ball blocking device of establishing between play feed cylinder and cylinder sieve, the ball blocking device is including being used for the first flange that links to each other with play feed cylinder and cylinder sieve, the fixed ball blocking plate that is equipped with in the inner edge position of first flange, the sieve mesh has been seted up on the ball blocking plate, the sieve mesh can supply the ore pulp to pass and can block the grinding ball and pass by a feed cylinder towards the cylinder sieve direction by the direction of play feed cylinder towards the cylinder sieve, be equipped with on the inner wall of play feed cylinder and be used for the anti-spiral that the grinding ball.
Preferably, the central point of first flange puts and is equipped with the second flange, and the outer fringe of second flange is connected at the inner edge of first flange through many connecting strips, has all seted up a plurality of bolt holes at the outer fringe position of the inner edge of first flange, connecting strip and second flange, all has sectorial ball baffle plate through hexagon socket head cap screw between two adjacent connecting strips, and annular ball baffle plate is constituteed jointly to all ball baffle plates.
Preferably, one end of the connecting strip, which is far away from the outer edge of the second flange, is connected into the spigot which is arranged at the inner edge of the first flange.
Preferably, a counter bore for accommodating a bolt head of the hexagon socket head cap screw is formed in the ball baffle plate, and a bolt head rubber plug for protecting the bolt head is arranged in the counter bore in an interference fit manner; the small end of the inner hexagon bolt is sequentially matched with and installed with a bowl-shaped nut protective sleeve and a nonmetal insert hexagonal locking nut after penetrating through the bolt hole, and a nut rubber plug used for protecting the nonmetal insert hexagonal locking nut is installed in the bowl-shaped nut protective sleeve in an interference fit manner.
Preferably, an L-shaped rubber protection pad is further arranged on the screw rod of the hexagon socket head cap screw at the bowl-shaped nut protection sleeve.
Preferably, glue-coated seals are arranged in the counter bore and the bowl-shaped nut protective sleeve.
Advantageous effects
On one hand, the ball blocking device blocks the discharge of grinding balls in the cylinder body of the ball mill, and the sieve holes on the ball blocking plate enable ore pulp to flow over, so that the loading limit position of an ore grinding medium of the overflow type ball mill is lifted; on the other hand accessible sets up the reverse spiral on the play feed cylinder inner wall and will overflow along with the ore pulp and get into the ball reversal of going out in the feed cylinder and carry to the mill barrel, compares with prior art, has improved ball mill grinding medium filling rate greatly.
Tests prove that the filling rate of an ore grinding medium of the ball mill is increased from 30.48% to 35.5% by additionally arranging the ball mill on a 6500kW large-scale ball mill, the yield of mine iron concentrate powder can be still kept under the state of iron ore difficult to grind, and better economic benefit is obtained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the ball stop device of the present invention;
FIG. 3 is a schematic perspective view of the mounting engagement of a first flange and a cylindrical screen portion of the ball retainer of the present invention;
FIG. 4 is a cross-sectional view of the portion of the ball retainer assembly in accordance with the present invention mounted in engagement with the first flange;
The labels in the figure are: 1. go out the feed cylinder, 2, the reverse spiral, 3, keep off the ball device, 4, the cylinder sieve, 5, first flange, 6, keep off the ball board, 601, keep off the ball board, 602, the sieve mesh, 7, bowl type nut protective sheath, 8, nut rubber buffer, 9, nonmetal inserts hexagonal lock nut, 10, the bolt hole, 11, L shape rubber protection pad, 12, counter bore, 13, bolt head rubber buffer, 14, hexagon socket head cap screw, 15, second flange, 16, the connecting strip.
Detailed Description
As shown in figure 1, the discharging device capable of improving the ore grinding medium filling rate of the overflow type ball mill comprises a discharging barrel 1 which is matched and arranged on a side end cover of the discharging side of the ball mill, a cylindrical screen 4 which is connected to the discharging barrel 1 and is far away from one end of the ball mill, and a ball blocking device 3 which is clamped between the discharging barrel 1 and the cylindrical screen 4. The ore pulp in the cylinder body of the mill enters the discharging cylinder 1 and the cylindrical screen 4 in sequence under the pushing action of new ore continuously filled in the feed inlet of the cylinder body, and the ore pulp is screened in the cylindrical screen 4. In the process, the ball blocking device 3 can block the grinding balls in the grinding machine barrel body from overflowing to the discharge barrel 1 along with ore pulp and continuously flow to the cylindrical screen 4, and the grinding balls blocked by the ball blocking device 3 are conveyed to the grinding machine barrel body direction in the continuous rotation of the discharge barrel 1 along with the grinding machine barrel body through the reverse spiral 2 arranged on the inner wall of the discharge barrel 1, so that the effect of improving the grinding medium filling rate of the grinding machine is achieved. The ore discharging effect of the overflow ball mill on fine-grained ore pulp can not be influenced.
as shown in fig. 2, the ball retainer 3 includes a first flange 5 and an annular ball retainer 6 fixed at an inner edge of the first flange 5. The first flange 5 is used for butting with flanges on the discharging barrel 1 and the cylindrical screen 4 on two sides. A plurality of sieve holes 602 are uniformly arranged on the ball baffle 6 at intervals, and the aperture of the sieve holes 602 is controlled to enable ore pulp to normally flow over and can prevent grinding balls from flowing over. The size of the sieve holes 602 can be designed according to the requirements of the mine process flow, and the amount of filling media of the overflow ball mill can be changed by adjusting the size of the sieve holes 602.
Referring to fig. 3, the first flange 5 of the present embodiment is concentrically provided with a second flange 15, and the second flange 15 is connected to a spigot disposed at an inner edge of the first flange 5 by a plurality of radially distributed connecting strips 16. A plurality of bolt holes 10 have all been seted up at the tang of first flange 5, the outer fringe position of connecting strip 16 and second flange 15, all be connected with sectorial ball board 601 through hexagon socket head cap screw 14 at the tang of first flange 5 that two adjacent connecting strips 16 and two adjacent connecting strips 16 correspond and the outer fringe position of second flange 15, and annular ball board 6 is constituteed jointly to all ball board 601.
As shown in fig. 4, the ball baffle 601 is connected with the spigot of the first flange 5, a counter bore 12 for accommodating a bolt head of an hexagon socket head bolt 14 is formed in the ball baffle 601, and a bolt head rubber plug 13 for protecting the bolt head is arranged in the counter bore 12 in an interference fit manner; the small end of the inner hexagon bolt 14 is sequentially matched with and installed with a bowl-shaped nut protective sleeve 7 and a 1-type nonmetal insert hexagonal locking nut 9 with a locking function after penetrating through the bolt hole 10, and a nut rubber plug 8 used for protecting the nonmetal insert hexagonal locking nut 9 is installed in the bowl-shaped nut protective sleeve 7 in an interference fit manner. An L-shaped rubber protection pad 11 is also arranged on the screw rod of the inner hexagon bolt 14 and positioned at the bowl-shaped nut protection sleeve 7. The L-shaped rubber protection pad 11 can protect the back surfaces of the whole first flange, the second flange 15 and the connecting strip 16 from being abraded and corroded by ore pulp, the service life of the L-shaped rubber protection pad is greatly prolonged, the times of detaching and installing the flanges are reduced, and the mine operation cost is saved. The counter bore 12 and the bowl-shaped nut protective sleeve 7 are both provided with gluing seals to further avoid the abrasion and corrosion of ore pulp, so that the well-protected hexagonal locking nut 9 with the non-metal insert can save the replacement time when being disassembled.
the assembly process of the invention is as follows:
Firstly, the first flange 5 is superposed and corresponds to a butt flange on the cylindrical screen 4, the first flange 5 is screwed in from the cylindrical screen 4 to the first flange 5 through a full-thread bolt, and the first flange 5 is firstly jointed on the cylindrical screen 4.
next, the ball retainer 601 is sequentially mounted in the bolt holes 10 of the first flange 5, the second flange 15, and the connecting bar 16 by the hexagon socket head cap screw 14 to form the ball retainer 3. And then the cylindrical screen 4 and the ball blocking device 3 are integrally butted on another butting flange arranged at the end part of the discharging barrel 1, and nuts are arranged on the full-thread bolts to fix the discharging barrel 1, the ball blocking device 3 and the cylindrical screen 4.
And finally, after the whole body is lifted, the whole body is installed on an end cover at the discharge side of the overflow ball mill by a via hole bolt, and the whole installation is completed.
Claims (6)
1. The utility model provides a can improve discharging device of overflow type ball mill ore grinding medium filling rate which characterized in that: comprises a discharging barrel (1) which is arranged on a side end cover of the discharging side of the ball mill in a matching way, a cylindrical screen (4) which is connected to the discharging barrel (1) and is far away from one end of the ball mill, and a ball blocking device (3) which is clamped between the discharging barrel (1) and the cylindrical screen (4), wherein the ball blocking device (3) comprises a first flange (5) which is used for connecting the discharging barrel (1) and the cylindrical screen (4), a ball baffle plate (6) is fixedly arranged at the inner edge position of the first flange (5), sieve holes (602) are arranged on the ball baffle plate (6), the sieve holes (602) can allow ore pulp to pass through from the discharging cylinder (1) towards the cylindrical sieve (4) and can prevent grinding balls from passing through from the discharging cylinder (1) towards the cylindrical sieve (4), the inner wall of the discharge barrel (1) is provided with a reverse spiral (2) used for conveying the grinding balls blocked by the ball blocking plate (6) towards the direction of the cylinder body of the grinding machine.
2. The discharging device capable of improving the ore grinding medium filling rate of the overflow ball mill according to claim 1, characterized in that: the central point of first flange (5) puts and is equipped with second flange (15), the inner edge at first flange (5) is connected through many connecting strips (16) in the outer fringe of second flange (15), at the inner edge of first flange (5), a plurality of bolt holes (10) have all been seted up to the outer fringe position of connecting strip (16) and second flange (15), all be connected with sectorial ball baffle plate (601) through hexagon socket head cap screw (14) between adjacent two connecting strips (16), annular ball baffle plate (6) is constituteed jointly in all ball baffle plate (601).
3. The discharging device capable of improving the ore grinding medium filling rate of the overflow ball mill according to claim 2, characterized in that: one end of the connecting strip (16) far away from the outer edge of the second flange (15) is connected in a spigot arranged at the inner edge of the first flange (5).
4. The discharging device capable of improving the ore grinding medium filling rate of the overflow ball mill according to claim 2, characterized in that: a counter bore (12) used for accommodating a bolt head of an inner hexagon bolt (14) is formed in the ball baffle plate (601), and a bolt head rubber plug (13) used for protecting the bolt head is arranged in the counter bore (12) in an interference fit manner; the small end of the inner hexagon bolt (14) penetrates through the bolt hole (10) and then is sequentially matched with a bowl-shaped nut protective sleeve (7) and a non-metal insert hexagon locking nut (9), and a nut rubber plug (8) used for protecting the non-metal insert hexagon locking nut (9) is arranged in the bowl-shaped nut protective sleeve (7) in an interference fit mode.
5. The discharging device capable of improving the ore grinding medium filling rate of the overflow ball mill according to claim 4, wherein: an L-shaped rubber protection pad (11) is also arranged at the bowl-shaped nut protection sleeve (7) on the screw rod of the inner hexagon bolt (14).
6. The discharging device capable of improving the ore grinding medium filling rate of the overflow ball mill according to claim 4, wherein: the counter bore (12) and the bowl-shaped nut protective sleeve (7) are both provided with glue coating seals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910605542.4A CN110538700A (en) | 2019-07-05 | 2019-07-05 | Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910605542.4A CN110538700A (en) | 2019-07-05 | 2019-07-05 | Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110538700A true CN110538700A (en) | 2019-12-06 |
Family
ID=68709770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910605542.4A Pending CN110538700A (en) | 2019-07-05 | 2019-07-05 | Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110538700A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113070133A (en) * | 2021-04-07 | 2021-07-06 | 江西理工大学 | Ore discharge end overflow weir controller capable of improving filling rate of ceramic balls of overflow ball mill |
| CN113522464A (en) * | 2021-07-29 | 2021-10-22 | 湖南柿竹园有色金属有限责任公司 | Ore discharging device of overflow type ball mill |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5798917A (en) * | 1993-03-03 | 1998-08-25 | Slegten Societe Anonyme | Control process for closed-circuit dry-method grinder |
| JP2012055803A (en) * | 2010-09-06 | 2012-03-22 | Koga Kensetsu:Kk | Ball mill |
| CN203044095U (en) * | 2012-12-04 | 2013-07-10 | 太原钢铁(集团)有限公司 | Discharging bushing of ball mill |
| CN106732991A (en) * | 2016-11-23 | 2017-05-31 | 江西稀有稀土金属钨业集团有限公司 | A kind of lining board of grinder bolt hole leakproof sizing device |
| CN107716005A (en) * | 2017-11-29 | 2018-02-23 | 江苏金牛铸钢件有限公司 | A kind of grate plate for coarse grinding bin of cement ball grinder |
| CN108816396A (en) * | 2018-06-11 | 2018-11-16 | 余柯 | A method of prevent ball mill grate plate from blocking |
| CN210787594U (en) * | 2019-07-05 | 2020-06-19 | 中信重工机械股份有限公司 | Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill |
-
2019
- 2019-07-05 CN CN201910605542.4A patent/CN110538700A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5798917A (en) * | 1993-03-03 | 1998-08-25 | Slegten Societe Anonyme | Control process for closed-circuit dry-method grinder |
| JP2012055803A (en) * | 2010-09-06 | 2012-03-22 | Koga Kensetsu:Kk | Ball mill |
| CN203044095U (en) * | 2012-12-04 | 2013-07-10 | 太原钢铁(集团)有限公司 | Discharging bushing of ball mill |
| CN106732991A (en) * | 2016-11-23 | 2017-05-31 | 江西稀有稀土金属钨业集团有限公司 | A kind of lining board of grinder bolt hole leakproof sizing device |
| CN107716005A (en) * | 2017-11-29 | 2018-02-23 | 江苏金牛铸钢件有限公司 | A kind of grate plate for coarse grinding bin of cement ball grinder |
| CN108816396A (en) * | 2018-06-11 | 2018-11-16 | 余柯 | A method of prevent ball mill grate plate from blocking |
| CN210787594U (en) * | 2019-07-05 | 2020-06-19 | 中信重工机械股份有限公司 | Discharging device capable of improving ore grinding medium filling rate of overflow type ball mill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113070133A (en) * | 2021-04-07 | 2021-07-06 | 江西理工大学 | Ore discharge end overflow weir controller capable of improving filling rate of ceramic balls of overflow ball mill |
| CN113522464A (en) * | 2021-07-29 | 2021-10-22 | 湖南柿竹园有色金属有限责任公司 | Ore discharging device of overflow type ball mill |
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| PB01 | Publication | ||
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Address after: 471003 Jianshe Road, Jianxi, Henan, No. 206, Applicant after: CITIC Heavy Industry Machinery Co., Ltd. Applicant after: Luoyang Mining Machinery Engineering Institute Co., Ltd. Address before: 471003 Jianshe Road, Jianxi, Henan, No. 206, Applicant before: Luoyang Mining Machinery Engineering Institute Co., Ltd. Applicant before: CITIC Heavy Industry Machinery Co., Ltd. |