CN104453891B - Coal mining machine and cutting part thereof - Google Patents
Coal mining machine and cutting part thereof Download PDFInfo
- Publication number
- CN104453891B CN104453891B CN201410589372.2A CN201410589372A CN104453891B CN 104453891 B CN104453891 B CN 104453891B CN 201410589372 A CN201410589372 A CN 201410589372A CN 104453891 B CN104453891 B CN 104453891B
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- winning machine
- ring
- cutting part
- wedge shape
- torque
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- 239000003245 coal Substances 0.000 title abstract description 22
- 238000005065 mining Methods 0.000 title abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 210000003371 toe Anatomy 0.000 claims description 37
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 230000013011 mating Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009993 protective function Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C31/00—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
- E21C31/02—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam for cutting or breaking-down devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Crushing And Pulverization Processes (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention provides a coal mining machine and a cutting part thereof. The cutting part of the coal mining machine comprises a speed reduction transmission mechanism and a connection square head, wherein the speed reduction transmission mechanism is provided with a power output shaft; the connection square head is connected with a roller of the coal mining machine; the power output shaft is connected with the connection square head by a torque limiter; overload protection is carried out on the cutting part by the torque limiter so that the breakage possibility of a torque shaft can be reduced and the downtime caused by maintenance of the coal mining machine is shortened; and furthermore, the operation cost of the coal mining machine is reduced.
Description
Technical field
The present invention relates to coal mine machinery, more particularly, to a kind of coal-winning machine and its cutting units.
Background technology
Winning machine cutting part is that coal-winning machine is coaling the execution unit of coal breakage, and Fig. 1 shows a kind of typical case in prior art
Winning machine cutting part sectional structure, as illustrated, cutting units includes：Cutting motor 7 ', torque axis 8 ', reduction gearing mechanism
With connection square toes (also referred to as planet square toes) 2 ', reduction gearing mechanism includes reduction box 6 ' and planetary reduction gear 5 '.Cutting motor
7 ' impart power to planetary reduction gear 5 ', planetary reduction gear by torque axis 8 ' and 6 ' drive connection of reduction box, reduction box 6 '
The central shaft 1 ' of 5 ' planet carrier be connected square toes 2 ' by spline fitted, then by connection square toes 2 ' drive coal-winning machine cylinder turn
It is dynamic, realize coal breakage of coalingging.
Coal-winning machine occurs overload when cylinder cut is to the higher tomography of hardness or set cap during coal cutting
Situation, may cause other drive disk assemblies such as cutting motor damage or gear, bearing to damage if overload protection can not be implemented in time.
Mainly pass through torque axis 8 ' to realize the overload protection to cutting motor and driving member in prior art, be provided with torque axis 8 '
Compensating groove, when transshipping occurs in winning machine cutting part, torque axis 8 ' can occur protectiveness fracture, cut-out cut electricity at compensating groove
Drive connection between machine 7 ' and reduction box 6 ', and then cutting motor 7 ' and other driving members can be avoided because overlond running is led
The damage of cause.Torque axis 8 ' can be extracted out after rupturing vertically, can be resumed production after then install new torque axis.
However, being suffered from the drawback that as the overload protection part of winning machine cutting part using torque axis 8 '：Conditions down-hole is disliked
When bad, during cut coal seam, overload condition is more, and the fracture of torque axis is more frequent, and torque axis dismounting inconvenience, more
The operation for changing torque axis is time-consuming longer, and the fault power time of coal-winning machine is long, causes coal-winning machine operating cost substantially to increase.
The content of the invention
It is an object of the present invention to provide one kind both can carry out overload protection to cutting motor and other driving members, and
The winning machine cutting part of coal-winning machine operating cost can be reduced.Present invention also offers a kind of coal-winning machine, applying has above-mentioned coal mining
Machine cutting units.
The winning machine cutting part that the present invention is provided, including reduction gearing mechanism and connection square toes, reduction gearing mechanism have
Power output shaft, connecting square toes is used to connect with the cylinder of coal-winning machine, and power output shaft and connection square toes are by the device connection of limit square.
Further, square device is limited for friction limit square device.
Further, limiting square device includes：Outer ring, inner ring, the first distensible ring, the second distensible ring and torque regulating bolt；It is interior
In outer ring, inner ring is set on the periphery of power output shaft circle, and connection side's headgear is located on the periphery of outer ring；Outer ring and interior
The first wedge shape space near limit square device first end is formed between circle, and near the second wedge shape sky at the second end of limit square device
Between, the first wedge shape space and the second wedge shape space are gradually tapered up from outside to inside；In embedded first wedge shape space of first distensible ring,
In embedded second wedge shape space of second distensible ring；Torque regulating bolt is passed through from the first distensible ring, and with the second distensible ring spiral shell
Connect.
Further, the mating shapes of the shape of the first distensible ring and the first wedge shape space, the shape of the second distensible ring
With the mating shapes of the second wedge shape space.
Further, torque regulating bolt is multiple, and multiple torque regulating bolts are evenly distributed in the circumferential direction.
Further, the limited step that is formed from power output shaft of one end for connecting square toes is spacing, and the other end is by pacifying
The baffle limiting of power output shaft end is mounted in, the hole passed through for torque regulating bolt on baffle plate, is offered.
Further, first annular boss is provided with the middle part of the inner circumferential of outer ring, in the middle part of the periphery of inner ring, is provided with the second ring
Shape boss, first annular boss and the second annular boss are oppositely arranged；Torque regulating bolt is from first annular boss and the second ring
Pass through in the middle of shape boss.
Further, reduction gearing mechanism includes reduction box and planetary reduction gear, and power output shaft is by planetary reduction gear
The central shaft of planet carrier is formed.
Further, the winning machine cutting part also includes cutting motor, and cutting motor is connected with reduction box by torque axis,
Compensating groove is not provided with torque axis.
Present invention also offers a kind of coal-winning machine, is provided with above-mentioned winning machine cutting part.
The winning machine cutting part that the present invention is provided, output power in changing prior art axle and connection square toes are by flower
Bonded mode, but output power axle and connection square toes, by limiting the connection of square device, so, coal-winning machine is in normal work
When, limit square device is non-slip, and equivalent to outputing power, axle and connection square toes are rigidly connected, and connection square toes can drive to be adopted
The normal cut coal seam of coal machine cylinder；When there are overload situations, limit square device skids, defeated with power equivalent to connection square toes have been cut off
Power transmission relationship between shaft, can avoid that shock loading caused to cutting motor, drive disk assembly and torque axis are broken
It is bad, realize the overload protection to winning machine cutting part；After load restoration is normal, limit square device can recover normal work.In limit
Under the overload protective function of square device, the probability that one side torque axis occurs fracture declines to a great extent, and also saves on frequently to change and turns round
The material expended needed for square axle and time cost, on the other hand after load recovery, limit square device also recovers automatically normal and uses, and adopts
Coal machine cutting units need not change parts after overload occurs, and reduce the shutdown maintenance cost of coal-winning machine, such that it is able to significantly
Reduce the operating cost of coal-winning machine.
Description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the sectional structure of the winning machine cutting part of prior art；
Fig. 2 shows the broken section structure of winning machine cutting part provided in an embodiment of the present invention；
Fig. 3 limits the sectional structure of square device in showing the embodiment of the present invention；
Fig. 4 limits the sectional structure of square device inner ring and outer ring in showing the embodiment of the present invention；
Fig. 5 limits the sectional structure of square the first distensible ring of device in showing the embodiment of the present invention.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combine.Below with reference to the accompanying drawings and in conjunction with the embodiments describing the present invention in detail.
Winning machine cutting part provided in an embodiment of the present invention, including reduction gearing mechanism and connection square toes, deceleration transmission machine
Structure has power output shaft 1, referring to Fig. 2, shows reduction gearing mechanism in winning machine cutting part provided in an embodiment of the present invention
A part (planetary reduction gear part) and connection square toes 2 sectional structure.Understand that winning machine cutting part is also with reference to prior art
Cutting motor, torque axis can be included, torque axis can have overload protection function and clutch function.Reduction gearing mechanism can be with
Including reduction box and planetary reduction gear 5, by torque axis and the input drive connection of reduction box, reduction box will be dynamic for cutting motor
After power passes to planetary reduction gear 5, the central shaft of the planet carrier of planetary reduction gear 5 forms the power output shaft of reduction gearing mechanism
1, can impart power to connect square toes 2, connecting square toes 2 is used to connect with the cylinder of coal-winning machine.Connection square toes 2 and power output
While 1 coaxial linkage of axle, cylinder is driven to do the rotation in cut coal seam.
In the present embodiment, the power output shaft 1 and connection square toes 2 of reduction gearing mechanism are connected by limiting square device 3, are changed
Axle 1 and connection square toes 2 are outputed power in prior art by way of spline connection, specifically, coal-winning machine is in normal work
When, limit square device 3 is non-slip, and equivalent to outputing power, axle 1 and connection square toes 2 are rigidly connected, and connect square toes 2 and power
1 coaxial linkage of output shaft simultaneously drives the normal cut coal seam of coal mining machine roller；When there are overload situations, limit square device 3 skids, quite
In cut off connection square toes 2 and power output shaft 1 between power transmission relationship, can avoid shock loading to cutting motor,
The destruction that drive disk assembly and torque axis are caused, realizes the overload protection to winning machine cutting part；After load restoration is normal, limit
Square device 3 can recover normal work.Under the overload protective function of limit square device 3, the probability that one side torque axis occurs fracture is big
Width declines, and also saves on and frequently changes material and the time cost expended needed for torque axis, on the other hand after load recovery,
Limit square device 3 also recovers automatically normal and uses, and winning machine cutting part need not change parts after overload occurs, and reduce coal-winning machine
Shutdown maintenance cost, such that it is able to the operating cost of coal-winning machine is greatly reduced.
It should be noted that due to can be by for part that overload protection is carried out to winning machine cutting part in the present embodiment
Limit square device 3 itself is realized, can just be not provided with compensating groove, only retain the clutch function of torque axis, so, work as coal mining on torque axis
When overload occurs in machine cutting units, torque axis is not susceptible to fracture, reduce further and safeguards cost needed for torque axis.
Limit square device 3 can be using known friction limit square device, and which is with power output shaft 1 and is connected the annexation of square toes 2
This area correlation technique is may refer to, be will not be described here.Or, limit square device 3 and can adopt the knot shown in the present embodiment
Structure, limit square device 3 include：Outer ring 31, inner ring 32, the first distensible ring 33, the second distensible ring 34 and torque regulating bolt 35.
It is located in outer ring 31 by inner ring 32 is can be seen that in Fig. 2, Fig. 3 and Fig. 4, inner ring 32 is set in power output shaft 1
On periphery, connection square toes 2 are set on the periphery of outer ring 31.It is formed between outer ring 31 and inner ring 32 near limit square device 3 first
First wedge shape space 301 at end, and near second wedge shape space 302 at 3 second end of limit square device, 301 He of the first wedge shape space
Second wedge shape space 302 is gradually tapered up from outside to inside.It should be noted that direction from outside to inside is referred to from inside and outside circle
Direction of the end to the axially central authorities of inside and outside circle.In first distensible ring, 33 embedded first wedge shape space 301, the second distensible ring 34
In embedded second wedge shape space 302, torque regulating bolt 35 is passed through from the first distensible ring 33, and with 34 spiral shell of the second distensible ring
Connect, the big I that limit square device 3 can transmit torque is arranged by torque regulating bolt 35, by set by torque regulating bolt 35
Torque value is limited the torque value allowable of square device 3, and limit square device 3 ensures the safeguard protection of cutting units drive system normal work
Value.It is appreciated that by tightening torque regulating bolt 35, the first distensible ring 33 and close to each other same of the second distensible ring 34 are made
When, the torque value allowable that limit square device 3 is provided can be improved, to adapt to the overload protection demand of different operating modes.
Using the limit square device 3, when coal-winning machine works, the first distensible ring 33, the second distensible ring 34 make inner ring 32 and outer ring
Sufficiently large frictional force is produced between 31, power output shaft 1 transmits torque to connect square toes 2 by the frictional force for limiting square device 3,
Connection square toes 2 drive cylinder to realize the coal breakage of coalingging of cutting units.When overload occurs, cut torque is beyond the allowable of limit square device 3
Torque value, occurs to skid because frictional force is not enough between inner ring 32 and outer ring 31, and then causes power output shaft 1 and be connected square toes 2
Between there is skidding, now connect square toes 2 will not rotate any more coal cutting coal breakage, cutting motor and its drive disk assembly are transshipped
Protection.When load restoration is normal, when load torque is less than the torque value allowable of square device 3 is limited, limit square device 3 is non-slip, connection
Square toes 2 can be rotated further so that cutting units recovers to use.
Preferably, referring to Fig. 4 and Fig. 5, the mating shapes of the shape of the first distensible ring 33 and the first wedge shape space 301,
The mating shapes of the shape of the second distensible ring 34 and the second wedge shape space 302, so, when torque regulating bolt 35 is tightened,
First distensible ring 33 and the second distensible ring 34 can be each along the inclined-plane reliable mobiles of wedge shape space.
Preferably, torque regulating bolt 35 is multiple, and multiple torque regulating bolts 35 are evenly distributed in the circumferential direction.Accordingly
Ground, along the circumferential direction equably opens up for installing torque regulating bolt 35 in the first distensible ring 33 and the second distensible ring 34
Unthreaded hole, screwed hole.By arranging multiple torque regulating bolts 35, it is ensured that limit stablizing for 3 structure of square device, with to cutting units reality
Existing reliable overload protection.First annular boss 36, inner ring are provided with the middle part of inner circumferential by Fig. 4 it can also be seen that outer ring 31
The second annular boss 37 is provided with the middle part of 32 periphery, first annular boss 36 and the second annular boss 37 are oppositely arranged, torque
Regulating bolt 35 is passed through from the middle of first annular boss 36 and the second annular boss 37, first annular boss 36 and the second convex annular
Platform 37 can play a part of Auxiliary support and be oriented to each torque regulating bolt 35.
Preferably, the limited step 10 that is formed from power output shaft 1 of one end for connecting square toes 2 is spacing, the other end by
Baffle plate 4 installed in 1 end of power output shaft is spacing, offers the hole 41 passed through for torque regulating bolt 35, to keep away on baffle plate 4
Exempt from connection square toes 2 and play occurs in the axial direction.
The embodiment of the present invention additionally provides a kind of coal-winning machine, and the coal-winning machine is provided with above-mentioned winning machine cutting part.Yin Ben
The winning machine cutting part that invention is provided can reach above-mentioned technique effect, and the coal-winning machine for being provided with the winning machine cutting part should also have
Standby corresponding technique effect, will not be described here.
These are only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of winning machine cutting part, it is characterised in that including reduction gearing mechanism and connection square toes (2), the deceleration transmission
Mechanism has power output shaft (1), and connection square toes (2) connects for the cylinder with coal-winning machine, the power output shaft (1)
With connection square toes (2) by limiting square device (3) connection；Limit square device (3) includes：It is outer ring (31), inner ring (32), first swollen
Tight ring (33), the second distensible ring (34) and torque regulating bolt (35)；
In the outer ring (31), the inner ring (32) is set in the periphery of the power output shaft (1) to the inner ring (32)
On, connection square toes (2) is set on the periphery of the outer ring (31)；
The first wedge shape space near limit square device (3) first end is formed between the outer ring (31) and the inner ring (32)
(301), and near second wedge shape space (302) at (3) second end of limit square device, first wedge shape space (301) and
Second wedge shape space (302) gradually tapers up from outside to inside；
First distensible ring (33) is embedded in first wedge shape space (301), and second distensible ring (34) is embedded described
In second wedge shape space (302)；
The torque regulating bolt (35) is passed through from first distensible ring (33), and with the second distensible ring (34) spiral shell
Connect.
2. winning machine cutting part according to claim 1, it is characterised in that the limit square device (3) is friction limit square device.
3. winning machine cutting part according to claim 1, it is characterised in that the shape of first distensible ring (33) and institute
State the mating shapes of the first wedge shape space (301), shape and second wedge shape space of second distensible ring (34)
(302) mating shapes.
4. winning machine cutting part according to claim 1, it is characterised in that the torque regulating bolt (35) be it is multiple,
The plurality of torque regulating bolt (35) is evenly distributed in the circumferential direction.
5. winning machine cutting part according to claim 1, it is characterised in that one end of the connection square toes (2) is by forming
Limited step (10) on the power output shaft (1) is spacing, and the other end is by installed in the power output shaft (1) end
Baffle plate (4) is spacing, and the hole (41) passed through for the torque regulating bolt (35) is offered on the baffle plate (4).
6. winning machine cutting part according to claim 1, it is characterised in that be provided with the middle part of the inner circumferential of the outer ring (31)
First annular boss (36), is provided with the second annular boss (37) in the middle part of the periphery of the inner ring (32), described first annular convex
Platform (36) and second annular boss (37) are oppositely arranged；The torque regulating bolt (35) is from the first annular boss
(36) and in the middle of second annular boss (37) pass through.
7. winning machine cutting part according to any one of claim 1 to 6, it is characterised in that the reduction gearing mechanism
Including reduction box and planetary reduction gear (5), the power output shaft (1) by the planetary reduction gear (5) planet carrier center
Axle is formed.
8. winning machine cutting part according to claim 7, it is characterised in that also including cutting motor, the cutting motor
It is connected with the reduction box by torque axis, on the torque axis, is not provided with compensating groove.
9. a kind of coal-winning machine, it is characterised in that the winning machine cutting part being provided with any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410589372.2A CN104453891B (en) | 2014-08-18 | 2014-10-28 | Coal mining machine and cutting part thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014204715456 | 2014-08-18 | ||
| CN201420471545 | 2014-08-18 | ||
| CN201410589372.2A CN104453891B (en) | 2014-08-18 | 2014-10-28 | Coal mining machine and cutting part thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104453891A CN104453891A (en) | 2015-03-25 |
| CN104453891B true CN104453891B (en) | 2017-05-17 |
Family
ID=52900562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410589372.2A Active CN104453891B (en) | 2014-08-18 | 2014-10-28 | Coal mining machine and cutting part thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104453891B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863583B (en) * | 2015-06-15 | 2018-06-22 | 中国矿业大学(北京) | A kind of coal mine section device for coal |
| CN105422774A (en) * | 2015-11-23 | 2016-03-23 | 中国矿业大学 | Overload protecting device for transmission element of cutting part of coal mining machine |
| CN113695056A (en) * | 2021-08-09 | 2021-11-26 | 山东邦迈智能科技有限公司 | Multifunctional anchor-guard transshipment crusher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1537115A (en) * | 1975-09-19 | 1978-12-29 | Eickhoff Geb | Drum cutter or tunnelling machines for underground mining |
| DE3821319A1 (en) * | 1988-06-14 | 1989-12-21 | Dorstener Maschf Ag | Drive unit for equipment at risk of overload, such as chain-driven face equipment in underground mining |
| CN2797746Y (en) * | 2005-04-18 | 2006-07-19 | 三一重型装备有限公司 | Means for protecting tracting unit of coal mining machine |
| CN200975421Y (en) * | 2006-10-31 | 2007-11-14 | 扬动股份有限公司 | Load adjustable coupling |
| CN101111662A (en) * | 2005-01-27 | 2008-01-23 | Dbt有限公司 | Device for milling rock and other materials and method for milling rock or the like using said device |
| CN102359373A (en) * | 2011-10-27 | 2012-02-22 | 中国矿业大学 | Drum shearer cutting part |
| CN102678109A (en) * | 2012-04-26 | 2012-09-19 | 三一重型装备有限公司 | Cutting part protective device for continuous mining machine and continuous mining machine |
| CN202707981U (en) * | 2012-06-15 | 2013-01-30 | 三一重型装备有限公司 | Transmission system torque protective device and engineering machinery |
| CN103104257A (en) * | 2013-01-31 | 2013-05-15 | 三一重型装备有限公司 | Coal mining machine and travel unit overload protective device thereof |
-
2014
- 2014-10-28 CN CN201410589372.2A patent/CN104453891B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1537115A (en) * | 1975-09-19 | 1978-12-29 | Eickhoff Geb | Drum cutter or tunnelling machines for underground mining |
| DE3821319A1 (en) * | 1988-06-14 | 1989-12-21 | Dorstener Maschf Ag | Drive unit for equipment at risk of overload, such as chain-driven face equipment in underground mining |
| CN101111662A (en) * | 2005-01-27 | 2008-01-23 | Dbt有限公司 | Device for milling rock and other materials and method for milling rock or the like using said device |
| CN2797746Y (en) * | 2005-04-18 | 2006-07-19 | 三一重型装备有限公司 | Means for protecting tracting unit of coal mining machine |
| CN200975421Y (en) * | 2006-10-31 | 2007-11-14 | 扬动股份有限公司 | Load adjustable coupling |
| CN102359373A (en) * | 2011-10-27 | 2012-02-22 | 中国矿业大学 | Drum shearer cutting part |
| CN102678109A (en) * | 2012-04-26 | 2012-09-19 | 三一重型装备有限公司 | Cutting part protective device for continuous mining machine and continuous mining machine |
| CN202707981U (en) * | 2012-06-15 | 2013-01-30 | 三一重型装备有限公司 | Transmission system torque protective device and engineering machinery |
| CN103104257A (en) * | 2013-01-31 | 2013-05-15 | 三一重型装备有限公司 | Coal mining machine and travel unit overload protective device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104453891A (en) | 2015-03-25 |
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