CN103394395B - Slag vertical-mill - Google Patents

Slag vertical-mill Download PDF

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Publication number
CN103394395B
CN103394395B CN201310367260.8A CN201310367260A CN103394395B CN 103394395 B CN103394395 B CN 103394395B CN 201310367260 A CN201310367260 A CN 201310367260A CN 103394395 B CN103394395 B CN 103394395B
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China
Prior art keywords
auxiliary
mill
grinding roller
hydraulic loading
main
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Expired - Fee Related
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CN201310367260.8A
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CN103394395A (en
Inventor
崔龙啸
蒋星坚
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Beijing Electric Power Automatic Equipment Co., Ltd.
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BEIJING TECHNICAL CENTER OF CHINA ENERGY ENGINEERING GROUP EQUIPMENT Co Ltd
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Abstract

The invention provides a kind of slag vertical-mill, comprise Vertical Mill basis, support, mill, main grinding roller, master rocker, main hydraulic loading mechanism, auxiliary grinding roller, auxiliary rocking arm, auxiliary hydraulic loading mechanism, casing; Wherein, also comprising: crane span structure, be three, and described crane span structure is tabular; Described support, main grinding roller, master rocker, main hydraulic loading mechanism are three one to one, and described crane span structure is connected between two adjacent described supports; Described auxiliary grinding roller, auxiliary rocking arm, auxiliary hydraulic loading mechanism are three one to one, and described in each, auxiliary rocking arm is located on crane span structure described in each, and described auxiliary rocking arm only comprises upper rocker arm; Described casing is mounted on described support and described crane span structure, and described powder concentrator is positioned on described casing; Described auxiliary hydraulic loading mechanism one end is connected with described casing, and the other end is connected with the described upper rocker arm of described auxiliary rocking arm.Overall weight of the present invention significantly reduces, cost reduction, and run more steady, power consumption reduces, and overall efficiency is higher.

Description

Slag vertical-mill
Technical field
The present invention relates to a kind of slag vertical-mill, particularly relate to the main grinding roller of slag vertical-mill, the arrangement of auxiliary grinding roller.
Background technology
Vertical Mill is a kind of desirable large-scale milling equipment, collection fragmentation, drying, grinding, classification are transported in one, production efficiency is high, bulk, graininess and powder raw material can be worn into required granular material, be widely used in the industries such as cement, electric power, metallurgy, chemical industry, nonmetallic ore.
Along with the treatment technology of blast furnace granulated slag is ripe gradually, and still have a large amount of slags not to be fully utilized at present, the development of slag vertical-mill has more wide prospect.
At present, the slag milling station producing 600000 tons per year is the main flow scale on market, the slag vertical-mill model matched with it is BRM46.2+2S (as shown in Figure 5), and this model slag vertical-mill has four grinding rollers and corresponding four rocker arrangements and four holder devices.During operation, two main grinding rollers that wherein diagonal angle is arranged play the effect of mainly milling, and two auxiliary grinding rollers play the effect of stone.And, no matter be support the master rocker mechanism of main grinding roller or support the auxiliary rocker arm body of auxiliary grinding roller, all each self-contained upper and lower two rocking arms.Application practice finds, the slag vertical-mill of the type also exists the problems such as outfit of equipment weight is comparatively large, installation and repairing cost is high, operational shock is comparatively large, power consumption.
Summary of the invention
The object of the present invention is to provide a kind of slag vertical-mill, manufacture installation and operation maintenance cost with the efficiency, the reduction that improve traditional Vertical Mill, improve operation stability.
To achieve these goals, the invention provides a kind of slag vertical-mill, comprise Vertical Mill basis, N number of support, mill, N number of main grinding roller, N number of master rocker mechanism, N number of main hydraulic loading mechanism, N number of auxiliary grinding roller, N number of auxiliary rocker arm body, N number of auxiliary hydraulic loading mechanism, casing; Described N number of support is distributed on described Vertical Mill basis, and described N number of master rocker mechanism one_to_one corresponding is articulated with described N number of pedestal upper end,
Described N number of main grinding roller one_to_one corresponding to be located in described N number of master rocker mechanism and to be positioned at above described mill, and described N number of main hydraulic loading mechanism connects one to one between the lower end of described N number of support and described N number of master rocker mechanism; Described N number of auxiliary grinding roller to be located on described N number of auxiliary rocker arm body and to be positioned at above described mill, and described N number of auxiliary hydraulic loading mechanism connects one to one in described N number of auxiliary rocker arm body; Described N number of main grinding roller and N number of auxiliary grinding roller interlaced arrangement above described mill; It is characterized in that, described slag vertical-mill also comprises: N number of crane span structure, N number of crane span structure in tabular, the two ends of each described crane span structure connect two adjacent described supports respectively, so that adjacent two described supports are connected as one, described N number of auxiliary rocker arm body is mounted on described N number of crane span structure respectively, described casing is mounted on described support and described crane span structure, described auxiliary hydraulic loading mechanism one end is connected with described casing, the other end is connected with described auxiliary rocker arm body, N be more than or equal to 2 positive integer.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, N=3,3 main grinding rollers and 3 auxiliary grinding roller interval configurations, be distributed in around mill at equal intervals.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, each auxiliary rocker arm body is made up of the auxiliary rocker arm shaft bearing be mounted on a crane span structure and the auxiliary rocking arm be arranged in auxiliary rocker arm shaft bearing, each auxiliary hydraulic loading mechanism one end is connected with the casing above described crane span structure, and the other end connects with the auxiliary rocking arm of corresponding auxiliary rocker arm body.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, described mill external diameter is Φ 4300mm, and weight is 70000KG; Described main grinding roller central diameter is Φ 1900mm, and single roller weight is 15240KG; Described auxiliary grinding roller central diameter is Φ 1250mm, and single roller weight is 5430KG.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, between the lower shake-changing arm and described support of described master rocker mechanism, be provided with master rocker mechanical stop limiter, described master rocker mechanical stop limiter comprises: top board, and a side is located on the lower shake-changing arm of described master rocker mechanism; Push rod, one end connects on the another side of described top board; Front apron, the front portion of described push rod is through described front apron; Backboard, the rear portion of described push rod is through described backboard; End cap, posterior lateral margin is fixed on described backboard, and described front apron is positioned at described cover internal, and the front portion of described push rod extends to the front portion of described end cap simultaneously; Ring spring, on sheathed described push rod, and is located between described front apron and backboard; Oblique flange, for being fixed on support, described backboard is fixed on described oblique flange; Brake hoop, is located at the rear end of described push rod, for controlling the position of described push rod; Control lever, is located at the rear end of described brake hoop, for controlling described brake hoop.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, the casing above crane span structure is provided with the auxiliary rocking arm mechanical stop limiter limiting described auxiliary rocker arm body action.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, described main hydraulic loading mechanism contains damper, described damper one end is connected with described support, the other end is connected with described main hydraulic loading mechanism, for cushioning the dither of described main hydraulic loading mechanism and auxiliary hydraulic loading mechanism.
According to a kind of preferred embodiment of above-mentioned slag vertical-mill, wherein, described slag vertical-mill is the BRM43.3+3S type slag vertical-mill being applicable to annual output 600000 tons of slag milling stations.
From upper analysis, the present invention to mill principle according to dispersion, and adopt less mill and less three main grinding rollers, the load that mill is subject to is disperseed.Three auxiliary grinding roller interlaced arrangement, between main grinding roller, play stone effect, reduce the operational shock of grinding machine further.Visible, the present invention is reasonable in design, and overall structure is optimized more, and outfit of equipment weight significantly reduces, and single grinding roller weight also significantly reduces simultaneously, and manufacture, installation, the cost of overhaul reduce, and during operation, vibration is less, and more steadily, power consumption reduces, and overall efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of the preferred embodiment of the present invention;
Fig. 2 is the plan structure schematic diagram of the main grinding roller of the preferred embodiment of the present invention, auxiliary grinding roller and mill;
Fig. 3 is the structural representation that the mechanical stop limiter of the preferred embodiment of the present invention is installed on master rocker mechanism;
Fig. 4 is the structure for amplifying schematic diagram of mechanical stop limiter in Fig. 3;
Fig. 5 is that the master of traditional main grinding roller, auxiliary grinding roller and mill looks and plan structure schematic diagram (upper figure is front view, and figure below is top view).
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Fig. 1 shows the overall structure of the preferred embodiment of the present invention, and Fig. 2 then emphasis illustrates the structure of the support of this preferred embodiment, main grinding roller, auxiliary grinding roller and mill.As shown in the figure, this preferred embodiment comprises Vertical Mill basis 1, support 2, mill 3, main hydraulic loading mechanism 4, master rocker mechanism 5, main grinding roller 6, auxiliary hydraulic loading mechanism 7, auxiliary grinding roller 8, crane span structure 9, auxiliary rocker arm body 10, broach hopper 11, hot-air mouth 12, casing 13, powder concentrator 14, mechanical stop limiter 15 and damper 16.
Wherein, Vertical Mill basis 1 is positioned at the integrally-built bottom of this preferred embodiment, three uniform circumference of support 2, is installed or be welded and fixed to be positioned on Vertical Mill basis 1 by bolt.Connected by the crane span structure 9 in tabular between two adjacent supports 2, such three crane span structures just link into an integrated entity with three holder devices, add the stability of holder device.Main gear reducer (unmarked) is positioned at the center on Vertical Mill basis 1, is furnished with liner plate in mill 3, and mill 3 is installed on main gear reducer output flange by bolt, together rotates with main gear reducer output flange.Main hydraulic loading mechanism 4 is connected with bottom support 2 by bearing pin one end, and the other end is connected with the lower shake-changing arm of master rocker mechanism 5.Main grinding roller 6 is connected by the upper rocker arm of roll shaft with master rocker mechanism 5, between the upper lower shake-changing arm of master rocker mechanism 5 by pinned connection together.Broach hopper 11 is positioned at around mill 3, and hot-air mouth 12 is connected with broach hopper 11, and auxiliary grinding roller 8 is fixed on crane span structure 9 by auxiliary rocker arm body 10, and casing 13 is mounted on support 2 with on crane span structure 9, and powder concentrator 14 is positioned on casing 13.
More specifically, three main grinding rollers 6 and three auxiliary grinding rollers 8 evenly and are alternately arranged on mill 3 along the circumferencial direction of mill 3, and main grinding roller 6 is assemblied in master rocker mechanism 5, and master rocker mechanism 5 is assemblied on support 2.Auxiliary grinding roller 8 is installed on crane span structure 9 by auxiliary rocker arm body 10, auxiliary rocker arm body 10 comprises in fact the bearing block be arranged on crane span structure 9, the auxiliary rocking arm be installed on bearing block, auxiliary hydraulic loading mechanism 7 one end is connected to the auxiliary rocking arm of auxiliary rocker arm body 10, one end is connected on the casing 13 above crane span structure, and auxiliary grinding roller 8 is rotatably installed on above-mentioned auxiliary rocking arm.
Compared with prior art, auxiliary rocker arm body 10 needs auxiliary rocking arm, no longer needs upper and lower two rocking arms, is equivalent to the lower shake-changing arm eliminating prior art, but by load maintainer directly by power transmission to upper rocker arm.
Although the preferred embodiment shown in Fig. 1 has three supports 2, main hydraulic loading mechanism 4, master rocker mechanism 5, main grinding roller 6, auxiliary hydraulic loading mechanism 7, auxiliary grinding roller 8, the present invention is not limited thereto, and each parts can change as required.
With a specific embodiment, the above-mentioned embodiment of the application favourable part in actual production is described below.
Present inventor investigated the new and effective BRM43.3+3S type slag vertical-mill (shown in Fig. 2) at supporting annual output 600000 tons of slag milling stations.The external diameter of its mill 3 is Φ 4300mm, weight is 70000KG, BRM46.2+2S type slag vertical-mill (shown in Fig. 5) the mill external diameter at traditional supporting annual output 600000 tons of slag milling stations is Φ 4600mm, weight is 76236KG, by comparison, mill 3 external diameter of this preferred embodiment decreases 300mm, and weight reduces 6236KG.
The quantity of main grinding roller 6 is 3 (being distributed in mill 3 around in 120 °), and central diameter is Φ 1900mm, and single roller weight is 15240KG; Traditional main grinding roller quantity of BRM46.2+2S type slag vertical-mill is 2, and main grinding roller central diameter is Φ 2240mm, and single roller weight is 24630KG, and by comparison, the gross weight of the main grinding roller of this preferred embodiment reduces 3540KG.
The quantity of auxiliary grinding roller 8 is 3 (be distributed in mill 3 around in 120 °, major-minor grinding roller is totally 6 interval configurations, is distributed at equal intervals around mill 3), and central diameter is Φ 1250mm, and single roller weight is 5430KG; Traditional auxiliary grinding roller quantity of BRM46.2+2S type slag vertical-mill is 2, and auxiliary grinding roller central diameter is Φ 1700mm, and single roller weight is 10135KG, and by comparison, the auxiliary grinding roller gross weight of this preferred embodiment reduces 3980KG.
Therefore, because dispersion is milled the application of principle, when ensureing that mill output is constant, this preferred embodiment have employed the mill of small diameter and 3 less main grinding rollers, the change and associated components such as the weight such as rocking arm, support that cause structure thus reduce, compare traditional BRM46.2+2S slag vertical-mill, complete machine weight drops to 565 tons by 635 tons, reduces 70 tons.
More preferably, in the preferred embodiment, master rocker mechanism 5, auxiliary rocker arm body 10, all containing the mechanical stop limiter 15 that structure is substantially identical, are guaranteed that corresponding grinding roller and mill under any circumstance all do not occur directly to contact, are avoided grinding machine strenuous vibration.As shown in Figure 3 and Figure 4, mechanical stop limiter master rocker mechanism 5 arranged comprises control lever 151, brake hoop 152, tiltedly flange 153, backboard 154, ring spring 155, front apron 156, end cap 157, push rod 158, top board 159.One side of top board 159 is supported or is located on the lower shake-changing arm of master rocker mechanism 5.One end of push rod 158 connects on the another side of top board 159.The front and rear of push rod 158 is each passed through front apron 156, backboard 154.End cap 157 is for having the tubular structure of the shaft shoulder, and its posterior lateral margin is fixed on backboard 154, and backboard 154 is fixed on the inner surface of support 2 by oblique flange 153.It is inner that front apron 156 is positioned at end cap 157, and the front portion of push rod 158 extends to the front portion of end cap 157 simultaneously, to connect top board 159.Ring spring 155 is arranged in end cap 157, on sheathed push rod 158, and between front apron 156 and backboard 154.Oblique flange 153 for being fixed on inside support 2, for backboard 156 provides support.Brake hoop 152 is located at the rear end of push rod 158, for controlling the position of push rod 158.Control lever 151 is located at the rear end of brake hoop 152, for controlling the rotation of brake hoop 152.
Mechanical stop limiter 15 mainly makes it withstand top board 159 on lower shake-changing arm by adjustment push rod 158, make to be assemblied between the main grinding roller 6 in master rocker mechanism 4 and the liner plate 30 on mill 3 and keep certain gap 60, avoid the Metal Contact between grinding roller 6 and liner plate 30, prevent grinding roller 6 or liner plate 30 from damaging because collision produces, avoid strenuous vibration simultaneously; Push rod 158 is adjusted by brake hoop 152, and after adjustment, available bolt etc. are fixing.
The mode be socketed as brake hoop and push rod can be as described below: the hole that brake hoop and push rod are socketed is square, and size is greater than push rod rear end square, can have about 2mm difference size therebetween; After adjusting push rod by brake hoop, after guaranteeing to there is certain interval between the hole of brake hoop and the rearward end of push rod, brake hoop is fixed by bolts on support, and brake hoop is motionless.During operation, lower shake-changing arm clash into push rod, push rod owing to being threaded togather with front apron, front apron together with push rod after move, front apron can withstand spring, spring contraction, spring plays cushioning effect, and push rod is owing to having gap with brake hoop, the process of moving after push rod is not owing to contacting with brake hoop, adding upper ejector pin is rectilinear movement, does not rotate, brake hoop therefore can not be driven to move.
Be threaded between front apron with push rod, in rotating forward under the drive of push rod at brake hoop, if front baffle board is not stopped by end cap, then front baffle board together can move forward towards top board direction with push rod, when front baffle board runs into the stop of end cap and can not advance, owing to being be threaded between front baffle board with push rod, now push rod can also be advanced forward by front apron relatively; But when push rod retreats, it is threaded connection and drives front apron to do identical motion.Spring one side contacts with front apron, and another side contacts with backboard, makes front apron be level can advance or retreat in end cap.
As shown in Figure 1, Figure 3, main hydraulic loading mechanism 4 oil cylinder is provided with damper 16, and damper 16 one end is connected with support 2, and the other end is connected with the oil cylinder of main hydraulic loading mechanism 5, for cushioning the dither of main hydraulic loading mechanism 5.Preferably, damper 16 is hydraulic damper apparatus, plays buffer protection function to the oil cylinder in running.
To sum up, in the present invention, main motor drives main gear reducer to rotate by shaft coupling, main gear reducer output flange band movable grinding disc and liner plate rotate, mill drives grinding roller to rotate by the material on it, and grinding roller belongs to passive rotation, and the hydraulic stroker in support drives grinding roller to move up and down by rocking arm, namely can lift grinding roller and pressurize to grinding roller, the material after grinding roller is milled with liner plate is separated by the powder concentrator of the rotation that the hot blast sent into from hot-air mouth takes on casing.Three main grinding rollers mainly work grinding effect of milling, and three auxiliary grinding rollers play the effect of stone and compacting material.
The structure that the structural design of three main grinding rollers and three auxiliary grinding rollers is milled relative to two grinding rollers symmetrical in BRM46.2+2S type slag vertical-mill structure, to mill principle owing to have employed dispersion, in the present invention, the active force of grinding roller to mill more disperses, and vibrates less, more stable in therefore running.
Three auxiliary grinding roller interlaced arrangement, between main grinding roller, play stone effect, reduce the operational shock of grinding machine further.
Visible, reasonable in design of the present invention, overall structure is optimized more, and outfit of equipment weight significantly reduces, single grinding roller weight also significantly reduces simultaneously, and manufacture, installation, the cost of overhaul reduce, and during operation, vibration is less, more steady, power consumption reduces, and overall efficiency is higher.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.

Claims (7)

1. a slag vertical-mill, comprises Vertical Mill basis, N number of support, mill, N number of main grinding roller, N number of master rocker mechanism, N number of main hydraulic loading mechanism, N number of auxiliary grinding roller, N number of auxiliary rocker arm body, N number of auxiliary hydraulic loading mechanism, casing;
Described N number of support is distributed on described Vertical Mill basis,
Described N number of master rocker mechanism one_to_one corresponding is articulated with described N number of pedestal upper end,
Described N number of main grinding roller one_to_one corresponding to be located in described N number of master rocker mechanism and to be positioned at above described mill,
Described N number of main hydraulic loading mechanism connects one to one between the lower end of described N number of support and described N number of master rocker mechanism;
Described N number of auxiliary grinding roller to be located on described N number of auxiliary rocker arm body and to be positioned at above described mill,
Described N number of auxiliary hydraulic loading mechanism connects one to one in described N number of auxiliary rocker arm body;
Described N number of main grinding roller and N number of auxiliary grinding roller interlaced arrangement above described mill;
It is characterized in that, described slag vertical-mill also comprises: N number of crane span structure in tabular, and the two ends of each described crane span structure connect two adjacent described supports respectively, so that adjacent two described supports are connected as one,
Described N number of auxiliary rocker arm body is mounted on described N number of crane span structure respectively,
Described casing is mounted on described support and described crane span structure,
Described auxiliary hydraulic loading mechanism one end is connected with described casing, and the other end is connected with described auxiliary rocker arm body, N be more than or equal to 2 positive integer;
Each auxiliary rocker arm body is made up of the auxiliary rocker arm shaft bearing be mounted on a crane span structure and the auxiliary rocking arm be arranged in auxiliary rocker arm shaft bearing,
Each auxiliary hydraulic loading mechanism one end is connected with the casing above described crane span structure, and the other end connects with the auxiliary rocking arm of corresponding auxiliary rocker arm body.
2. slag vertical-mill according to claim 1, is characterized in that,
N=3,
3 main grinding rollers and 3 auxiliary grinding roller interval configurations, be distributed in around mill at equal intervals.
3. slag vertical-mill according to claim 1, is characterized in that,
Described mill external diameter is Φ 4300mm, and weight is 70000KG;
Described main grinding roller central diameter is Φ 1900mm, and single roller weight is 15240KG; Described auxiliary grinding roller central diameter is Φ 1250mm, and single roller weight is 5430KG.
4. slag vertical-mill according to claim 1, is characterized in that,
Master rocker mechanical stop limiter is provided with between the lower shake-changing arm and described support of described master rocker mechanism,
Described master rocker mechanical stop limiter comprises:
Top board, a side is located on the lower shake-changing arm of described master rocker mechanism;
Push rod, one end connects on the another side of described top board;
Front apron, the front portion of described push rod is through described front apron;
Backboard, the rear portion of described push rod is through described backboard;
End cap, posterior lateral margin is fixed on described backboard, and described front apron is positioned at described cover internal, and the front portion of described push rod extends to the front portion of described end cap simultaneously;
Ring spring, on sheathed described push rod, and is located between described front apron and backboard;
Oblique flange, for being fixed on support, described backboard is fixed on described oblique flange;
Brake hoop, is located at the rear end of described push rod, for controlling the position of described push rod;
Control lever, is located at the rear end of described brake hoop, for controlling described brake hoop.
5. slag vertical-mill according to claim 1, is characterized in that,
Casing above crane span structure is provided with the auxiliary rocking arm mechanical stop limiter limiting described auxiliary rocker arm body action.
6. slag vertical-mill according to claim 1, is characterized in that,
Described main hydraulic loading mechanism contains damper, and described damper one end is connected with described support, and the other end is connected with described main hydraulic loading mechanism, for cushioning the dither of described main hydraulic loading mechanism and auxiliary hydraulic loading mechanism.
7. slag vertical-mill according to claim 1, is characterized in that,
Described slag vertical-mill is the BRM43.3+3S type slag vertical-mill being applicable to annual output 600000 tons of slag milling stations.
CN201310367260.8A 2013-08-21 2013-08-21 Slag vertical-mill Expired - Fee Related CN103394395B (en)

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Publication number Priority date Publication date Assignee Title
CN103639018B (en) * 2013-12-17 2017-11-10 临沂市博信机械有限公司 Adaptive vibration accumulation and energy supply vertical roll grinder

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US5244157A (en) * 1989-07-04 1993-09-14 Loesche Gmbh Air flow rolling mill
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CN202143851U (en) * 2011-06-22 2012-02-15 北京电力设备总厂 Vertical mill with mutually standby main and auxiliary roller sets
CN102430454A (en) * 2011-11-07 2012-05-02 溧阳中材重型机器有限公司 Grinding roller limiting device of vertical mill
CN102580819A (en) * 2012-02-27 2012-07-18 南京凯盛国际工程有限公司 Novel vertical milling limiting device
CN203459115U (en) * 2013-08-21 2014-03-05 中国能建集团装备有限公司北京技术中心 Vertical mill for mineral slag

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US20090127362A1 (en) * 2007-11-16 2009-05-21 Flsmidth A/S Roller mill for comminuting solid materials

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244157A (en) * 1989-07-04 1993-09-14 Loesche Gmbh Air flow rolling mill
CN102008987A (en) * 2010-10-27 2011-04-13 溧阳中材重型机器有限公司 Vertical mill with vibration damping hydraulic cylinder
CN202143851U (en) * 2011-06-22 2012-02-15 北京电力设备总厂 Vertical mill with mutually standby main and auxiliary roller sets
CN102430454A (en) * 2011-11-07 2012-05-02 溧阳中材重型机器有限公司 Grinding roller limiting device of vertical mill
CN102580819A (en) * 2012-02-27 2012-07-18 南京凯盛国际工程有限公司 Novel vertical milling limiting device
CN203459115U (en) * 2013-08-21 2014-03-05 中国能建集团装备有限公司北京技术中心 Vertical mill for mineral slag

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