CN107013226A - The topping machanism and development machine of a kind of development machine - Google Patents
The topping machanism and development machine of a kind of development machine Download PDFInfo
- Publication number
- CN107013226A CN107013226A CN201710356975.1A CN201710356975A CN107013226A CN 107013226 A CN107013226 A CN 107013226A CN 201710356975 A CN201710356975 A CN 201710356975A CN 107013226 A CN107013226 A CN 107013226A
- Authority
- CN
- China
- Prior art keywords
- tool rest
- cutterhead
- development machine
- edge doctor
- topping machanism
- 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
- 125000006850 spacer group Chemical group 0.000 claims description 27
- 230000033001 locomotion Effects 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 10
- 210000001138 tear Anatomy 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Details Of Cutting Devices (AREA)
Abstract
A kind of topping machanism of development machine of the present invention, including cutterhead, it is provided with cutterhead on the knife beam along the radial direction extension of cutterhead, knife beam and is equipped with tool rest, it is equipped with tool rest and the telescoping mechanism that radial direction of the driving tool rest along cutterhead is moved is provided with edge doctor, knife beam.Tool rest in the topping machanism of the present invention can in the radial direction be moved along cutterhead, and tool rest drives edge doctor to be extended and retracted along cutterhead radial direction.After edge doctor weares and teares, telescoping mechanism can drive tool rest to be displaced outwardly, and tool rest stretches out with edge doctor, be compensated the abrasion of edge doctor.It therefore, it is possible to be continuing with edge doctor, need not temporarily change, be changed untill the overhang of edge doctor is insufficient to compensate for the wear extent of edge doctor, then to edge doctor.Advantages of the present invention is to ensure that the diameter that cutterhead is excavated does not reduce first, and next is the reduction of the replacement frequency of edge doctor, and then can reduce because edge doctor frequently changes the risk brought.
Description
Technical field
The invention belongs to the technical field of tunneling equipment, and in particular to a kind of topping machanism of development machine, while this
Invention additionally provides the development machine using the topping machanism.
Background technology
At present, at home in existing tunnel Project Shield machine, the topping machanism of shield machine is to be pacified by cutterhead body with fixed
The various cutters of dress in the above are collectively constituted, and during tunnelling, the size of tunnel diameter is configured on cutterhead
The radial dimension of edge doctor control.Edge doctor is fastened by bolts on tool rest in the prior art, and knife of backbreaking is fixedly installed
On tool rest, the edge doctor and knife of backbreaking that the tool rest is directly welded on the periphery of cutterhead body, therefore cutterhead body are excavated
Diameter immobilize, it is impossible to according to the radial dimension of the excavation of geological state and requirement of engineering adjust automatically edge doctor.Compared with
Long excavation is interval, the situation for edge doctor abrasion often occur, causes cutterhead digging diameter to reduce, and such case can bring following ask
Topic：The increase of shield body frictional resistance, or even there is " card shield " phenomenon；The abrasion aggravation of cutterhead body large circle, easily causes cutterhead body
Damage；Shield machine fltting speed is reduced, or even can not normally be tunneled.As long as defined in therefore the digging diameter of edge doctor is reduced to
Threshold value, it is necessary to change digging diameter that edge doctor just can guarantee that cutterhead in scope of design, can so cause edge doctor to change
The problem of frequency increases, therefore presence is taken a lot of work, time-consuming, cost is high.Also, all it is due to changing edge doctor operating personnel every time
" with pressure " to enter in soil cabin, frequently changing edge doctor can cause personal safety hidden danger high.
The content of the invention
The present invention solves the technical problem of provide a kind of cutting for the development machine that can be adjusted and radially excavate size
Device, it is ensured that the digging diameter of cutterhead is in scope of design, to solve in the prior art because edge doctor abrasion easily causes shield body
The problem of card shield, while solve, because edge doctor is changed often, to cause maintenance cost high, the problem of potential safety hazard is big, while this
Invention additionally provides a kind of development machine, it is ensured that headwork is smoothed out.
In order to solve the above technical problems, the technical scheme that the topping machanism of the development machine of the present invention is used is：The present invention's
It is provided with the topping machanism of development machine, including cutterhead, the cutterhead on the knife beam along the radial direction extension of the cutterhead, the knife beam
Tool rest is equipped with, edge doctor is equipped with the tool rest, is provided with the knife beam and drives radial direction of the tool rest along the cutterhead to move
Dynamic telescoping mechanism.
Limit what radial direction of the tool rest along the cutterhead was excessively moved it is further preferred that being additionally provided with the knife beam
Position-limit mechanism.
It is further preferred that above-mentioned telescoping mechanism includes the driving member being fixedly connected with the tool rest and drives the driving member
The actuator for driving radial direction of the tool rest along the cutterhead to move.
It is further preferred that the actuator is to be hinged the telescoping cylinder being arranged on the knife beam, the axis of the telescoping cylinder is located at
On the RADIAL of above-mentioned tool rest movement, the driving member is drive link, and one end of the drive link is fixedly connected with the tool rest, the other end
It is articulated and connected by the expansion link of spherical bearing and the telescoping cylinder.
It is further preferred that above-mentioned telescoping mechanism also includes the guide for being used to be oriented to the drive link.
It is further preferred that the guide is the guide pad being fixedly installed on the knife beam, edge is provided with the guide pad
The guide groove of the moving direction extension of the drive link, drive link movement is assemblied in the guide groove.
It is further preferred that above-mentioned position-limit mechanism includes the spacer pin being installed on above-mentioned guide pad, the spacer pin is with being somebody's turn to do
The moving direction of drive link is vertically arranged, and the Stop structure coordinated with the spacer pin block is provided with the drive link.
It is further preferred that the spacing of the spacer pin that accommodate that above-mentioned Stop structure, which is above-mentioned drive link upper surface, to be set is led to
Groove width between groove, the two side of the spacing groove is the spacer pin diameter and the maximum overhang sum of the edge doctor,
The two side of the spacing groove is the stopping surface coordinated when the spacer pin is moved with the outer wall block of the spacer pin.
It is further preferred that being installed with block on the tool rest between the tool rest and the side wall of the knife beam, the knife is kept
The inside of beam and the block part of outside seal isolation.
The present invention development machine use technical scheme be：Cutting dress including the development machine described by any of the above-described
Put.The beneficial effect of topping machanism of the development machine of the present invention is：The topping machanism of the present invention, tool rest can be along cutterhead radial direction side
Move up, tool rest drives edge doctor to be extended and retracted along cutterhead radial direction.After edge doctor weares and teares, telescoping mechanism can drive
Moving knife seat is displaced outwardly, and tool rest stretches out with edge doctor, is compensated the abrasion of edge doctor.Can then proceed to use the side
Scraper, need not temporarily be changed, untill the overhang of edge doctor is insufficient to compensate for the wear extent of edge doctor, then to edge doctor
Changed.Edge doctor, which stretches out, first can compensate for wear extent, it is ensured that the diameter that cutterhead is excavated.Secondly, edge doctor stretches out compensation
The wear extent of edge doctor, can wouldn't change edge doctor and be continuing with, and reduce the replacement frequency of edge doctor, so can reduce by
The risk brought frequently is changed in edge doctor.
Further, the position-limit mechanism being preferably provided with, when can reach greatest wear amount in edge doctor, prevents edge doctor excessive
Stretch out, and position-limit mechanism can also point out the wear extent that edge doctor has been maxed out, it is necessary to change edge doctor.
Further, the telescoping mechanism being preferably provided with is that telescoping cylinder drives drive link movement, and between drive link and telescoping cylinder
Setting is hinged by spherical bearing, there is scale error during fabrication due to parts such as drive link, tool rests and exist when mounted
Alignment error, by the way of sphere is hinged, it is to avoid the knife caused due to drive link, tool rest equidimension error and alignment error
The problem of beam portion point stress is big or can not install.
Further, the guide being preferably provided with, guiding is played a part of to drive link in moving process, moves drive link
Dynamic direction is more accurate, it is ensured that edge doctor is constant with respect to the position of cutterhead, it is ensured that the dynamics of cutting.
Further, the position-limit mechanism being preferably provided with coordinates using spacer pin and cotter way are spacing, simple in construction, safe and reliable
Property, Maintenance free can be realized accurately and reliably spacing to edge doctor.
Further, the block part being preferably provided with, block part stretches out movement with tool rest, and can guarantee that inside knife beam and outer
The seal isolation in portion, can effectively prevent debris from entering inside knife beam, it is to avoid the normal operation of influence telescoping mechanism.
Brief description of the drawings
Fig. 1 is the structural representation of the topping machanism embodiment of the development machine of the present invention；
Fig. 2 be the present invention development machine topping machanism embodiment in edge doctor stretch out state diagram；
Fig. 3 is Fig. 1 right view；
Fig. 4 be the present invention development machine another embodiment of topping machanism in telescoping mechanism structural representation.
Embodiment
The present invention embodiment description in, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ",
The orientation of instruction such as " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " or
Position relationship is, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention and simplify description, without
It is that instruction or the signified device of hint or element must have specific orientation, with specific azimuth configuration and operation, therefore not
It is understood that as limitation of the present invention.In addition, term " first ", " second " etc. are only used for describing purpose, and it is not intended that referring to
Show or imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", " second " are defined
Deng feature can express or implicitly include one or more this feature.In the description of the invention, unless otherwise
Illustrate, the implication of " multiple " refers to two or more.Term "and/or" used in this specification includes one or more
The arbitrary and all combination of related Listed Items.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly.For example, it may be being fixedly connected or being detachably connected, or it is integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
For the ease of understanding the present invention, below in conjunction with the accompanying drawings and specific embodiment, the present invention will be described in more detail.
The preferred embodiment of the present invention is given in accompanying drawing.But, the present invention can be realized in many different forms, not limited
In the embodiment described by this specification.On the contrary, the purpose for providing these embodiments makes to the disclosure
Understand more thorough comprehensive.
As shown in Figures 1 to 3, set on the embodiment of the topping machanism for the development machine that the present invention is provided, including cutterhead, cutterhead
Have to be equipped with tool rest 12, the outer side edges of tool rest 12 on the knife beam 17 along the radial direction extension of the cutterhead, knife beam 17 and pass through side
Scraper bolt 15 is detachably provided with edge doctor 14, and edge doctor 14 is installed using edge doctor bolt 15, facilitates tearing open for edge doctor 14
Unload replacing.The outer end of tool rest 12, which is welded with, backbreaks knife 13 or is welded with the cutter for keeping digging diameter class.Set on knife beam 17
There is the telescoping mechanism that radial direction of the driving tool rest 12 along cutterhead is moved.
Further preferably it is configured, telescoping mechanism can use following structure, including the transmission being fixedly connected with tool rest 12
Part, and it is connected to the actuator that driving driving member drives tool rest movement with driving member.Specifically, actuator is telescoping cylinder 1,
One end of telescoping cylinder 1 is arranged on knife beam 17 by bearing pin 18, and driving member is linear drive link 5, the expansion link of telescoping cylinder 1
3 are articulated and connected with the rear end of drive link 5 by spherical bearing 4.The specific structure that is articulated and connected is：The rear end of drive link 5 is relative
It is provided with installation otic placode, spherical bearing 4 is arranged on two and installed between otic placodes, the outer ring of spherical bearing 4 is fixedly mounted on flexible
On the expansion link 3 of cylinder 1, spherical bearing 4 passes through the inner ring of spherical bearing 4 by the mounting pin 2 penetrated by the installation otic placode of side,
Penetrate into again on the installation otic placode of opposite side, and then be connected to the rear end of drive link 5.Because the parts such as drive link 5, tool rest 12 exist
There is scale error during manufacture, and can also have alignment error when mounted, using by the flexible of drive link 5 and telescoping cylinder 1
Bar 3 is articulated and connected, and can adapt to above-mentioned manufacturing and fixing error, it is to avoid due to drive link 5, tool rest 12 equidimension error and
The problem of part stress of knife beam 17 that alignment error is caused is big or can not install.
Assembling structure between drive link 5 and tool rest 12 is:Assembling groove is provided with the end face of the front end of drive link 5,
The projection coordinated with the assembling groove grafting on drive link 5 is provided with the rear end face of tool rest 12, tool rest 12 is convex by thereon
Rise in the assembling groove being inserted on drive link 5 and the location and installation of drive link 5, then again by the connection of tool rest 12 and drive link 5
Place is welded, and completes tool rest 12 and the fixing assembling of drive link 5.Tool rest 12 is first plugged on drive link 5 by projection, then will
Tool rest 12 is welded with drive link 5, and so setting makes the installation site of tool rest 12 accurate, and make tool rest 12 and drive link 5 it
Between connect more firm.
The present embodiment when in use, edge doctor 14 and backbreaks knife 13 after being worn and torn using a period of time, when detecting cutterhead
When digging diameter is less than default digging diameter, cutterhead is first stopped, and starts telescoping cylinder 1, and the expansion link 3 of telescoping cylinder 1 drives
Drive link 5 is protruding along the radial direction of cutterhead, and the distance of stretching is the wear extent of edge doctor 14, to compensate edge doctor 14
With the abrasion for knife 13 of backbreaking, it is ensured that the diameter that cutterhead is excavated.Can then proceed to using edge doctor 14 and backbreak knife 13, temporarily not
Need to change, then start cutterhead, continuation is excavated to tunnel.The present embodiment can wear and tear in edge doctor 14 and knife 13 of backbreaking
Afterwards, it is compensated quickly edge doctor 14 and the wear extent for knife 13 of backbreaking, it is ensured that the diameter that cutterhead is excavated, is rubbed to reducing shield body
Resistance is wiped, " card shield " risk is reduced, reduces the abrasion of cutterhead large circle, ensures that shield driving speed is respectively provided with significance, simultaneously
Edge doctor and backbreak knife wear-compensating and also pass through strong abrasion stratum over long distances for shield machine that there is provided security solution.This
Embodiment reduces the replacing of edge doctor 14, and then reduce due to edge doctor when shield machine passes through strong abrasion stratum over long distances
14 frequently change the risk brought.
Further preferably it is configured, is additionally included in telescoping mechanism in the moving process of drive link 5 and drive link 5 is oriented to
Guide.Specifically, the guide is the guide pad 7 being fixedly installed on knife beam 17, it is provided with guide pad 7 along drive link
The guide groove of 5 moving direction extension, the movement of drive link 5 is assemblied in the guide groove.Drive link 5 is moved along guide groove, makes biography
The moving direction of lever 5 is more accurate, it is ensured that the position relative to cutterhead of edge doctor 14 is constant, it is ensured that the dynamics of cutting and side are scraped
The precision that knife 14 is compensated.
It is further preferred that the limitation tool rest 12 that the topping machanism of the present embodiment also includes setting on knife beam 17 is excessively mobile
Position-limit mechanism.Specifically, position-limit mechanism is included across the top in guide groove and the spacer pin 6 that is installed on guide pad 7.Limit
Position pin 6 is to be installed to by following structure on guide pad 7, and the limit pin hole penetrated for spacer pin 6 is provided with guide pad 7
8, after spacer pin 6 is penetrated into limit pin hole 8, spacer pin 6 is pressed abd fixed in limit pin hole 8 by a cover plate 10, cover plate
10 are fixed on guide pad 7 by bolt 9.The Stop structure coordinated with the block of spacer pin 6 is provided with drive link 5.
Further preferably it is configured, above-mentioned Stop structure is the spacing logical of the receiving spacer pin 6 that the upper surface of drive link 5 is set
Groove width between groove 11, two walls of spacing groove 11 is the diameter of spacer pin 6 and the maximum overhang sum of edge doctor 14, limit
The stopping surface that the two side of position groove 11 coordinates for the outer wall block when spacer pin 6 is moved with spacer pin 6.
Edge doctor 14 is protruding under the drive of drive link 5, can not be further continued for stretching out compensation when edge doctor 14 may wear to
During wear extent, now edge doctor 14 reaches the wear extent of maximum, and spacer pin 6 is contacted with the rear wall block of spacing groove 11, prevented
Because drive link 5 continues to stretch out, other accessories such as abrasion tool rest 12.Because position-limit mechanism is spacing using spacer pin and spacing groove
Coordinate, mechanical block position limiting structure, simple in construction, security reliability, Maintenance free, and service life is long.
Touch sensor can be set on the rear wall of spacing groove 11, when the overhang of edge doctor 14 reaches maximum,
Spacer pin 6 is contacted with the rear wall block of spacing groove 11, the touching touch sensor of spacer pin 6, and touch sensor is by signal
Control centre is transferred to, points out edge doctor to need to change, control centre receives the signal and sends the instruction for changing edge doctor.
Certain control centre can also take other modes to judge whether to need to change edge doctor, for example, can basis
The modes such as the drag size that the overhang for measuring the expansion link of telescoping cylinder, the expansion link for measuring telescoping cylinder are subject to.
It is further preferred that being installed with block on tool rest 12 between tool rest 12 and the side wall of knife beam 17, knife beam 17 is kept
Inside and the block part 16 of outside seal isolation.After edge doctor 14 stretches out, between the front end face of edge doctor 14 and knife beam 17
A gap can be formed, block part 16 stretches out with edge doctor, the gap can be closed, it is ensured that knife beam 17 it is inside and outside
Seal isolation, effectively prevent debris from entering inside knife beam 17, it is to avoid influence telescoping cylinder 1 normal operation.
In other embodiments, as shown in figure 4, above-mentioned telescoping mechanism can also take motor to drive crank connecting link machine
Structure realizes the movement of tool rest, and motor 20 is arranged on the rear back side of cutterhead, is provided with knife beam 17 in shifting chute 22, shifting chute 22
Movable block 23 is provided with, toggle 21 is articulated and connected with movable block 23, front end and the tool rest 12 of the movable block 23 are fixed
Connection, motor 20, which is powered, drives toggle 21 to move, and driving toggle 21 drives movable block 23 to move, and then
Tool rest 12 is driven to move.
In other embodiments, above-mentioned position-limit mechanism can also be taken and be set on knife beam on the moving direction of tool rest
Limit switches, when tool rest is moved to maximum position, telescoping mechanism touches limit switch, limit switch control telescoping mechanism
Stop motion.
The embodiment of the development machine of the present invention, includes the topping machanism of above-mentioned described development machine.
When the development machine of the present invention employs above-mentioned described topping machanism and tunneled, development machine excavation ensure that
Diameter will not reduce, will not occur the accident of card shield, safety coefficient is high, it is ensured that headwork is smoothed out.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical fields are directly or indirectly used in,
It is included within the scope of the present invention.
Claims (10)
1. the radial direction extension along the cutterhead is provided with a kind of topping machanism of development machine, including cutterhead, the cutterhead
Knife beam, be equipped with tool rest, the tool rest on the knife beam and be equipped with edge doctor, it is characterised in that set on the knife beam
There is the telescoping mechanism for driving radial direction of the tool rest along the cutterhead to move.
2. the topping machanism of development machine according to claim 1, it is characterised in that limitation institute is additionally provided with the knife beam
State the position-limit mechanism that radial direction of the tool rest along the cutterhead is excessively moved.
3. the topping machanism of development machine according to claim 2, it is characterised in that the telescoping mechanism includes and the knife
Driving member and the driving driving member that seat is fixedly connected drive the drive that radial direction of the tool rest along the cutterhead is moved
Moving part.
4. the topping machanism of development machine according to claim 3, it is characterised in that the actuator is arranged on institute to be hinged
The telescoping cylinder on knife beam is stated, the axis of the telescoping cylinder is located on the RADIAL that the tool rest is moved, and the driving member is transmission
Bar, one end of the drive link is fixedly connected with the tool rest, and the other end passes through spherical bearing and the expansion link of the telescoping cylinder
It is articulated and connected.
5. the topping machanism of development machine according to claim 4, it is characterised in that the telescoping mechanism also includes being used for pair
The guide that the drive link is oriented to.
6. the topping machanism of development machine according to claim 5, it is characterised in that the guide is is fixedly installed on
State the guide groove being provided with the guide pad on knife beam, the guide pad along the moving direction extension of the drive link, the biography
Lever movement is assemblied in the guide groove.
7. the topping machanism of development machine according to claim 6, it is characterised in that the position-limit mechanism includes being installed in institute
The spacer pin on guide pad is stated, the moving direction of the spacer pin and the drive link is vertically arranged, set on the drive link
There is the Stop structure coordinated with the spacer pin block.
8. the topping machanism of development machine according to claim 7, it is characterised in that the Stop structure is the drive link
Groove width between the spacing groove for the receiving spacer pin that upper surface is set, the two side of the spacing groove is described spacing
Diameter and the maximum overhang sum of the edge doctor are sold, when the two side of the spacing groove is moved for the spacer pin
The stopping surface coordinated with the outer wall block of the spacer pin.
9. the topping machanism of development machine according to claim 8, it is characterised in that block is installed with the tool rest in institute
Between the side wall for stating tool rest and the knife beam, inside and the block part of outside seal isolation of the knife beam are kept.
10. a kind of development machine, it is characterised in that the cutting dress including the development machine described in claim 1~9 any claim
Put.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710356975.1A CN107013226A (en) | 2017-05-19 | 2017-05-19 | The topping machanism and development machine of a kind of development machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710356975.1A CN107013226A (en) | 2017-05-19 | 2017-05-19 | The topping machanism and development machine of a kind of development machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107013226A true CN107013226A (en) | 2017-08-04 |
Family
ID=59449290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710356975.1A Pending CN107013226A (en) | 2017-05-19 | 2017-05-19 | The topping machanism and development machine of a kind of development machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN107013226A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108825257A (en) * | 2018-09-05 | 2018-11-16 | 中国铁建重工集团有限公司 | Development machine and its knife of backbreaking |
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Cited By (2)
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| CN108825257A (en) * | 2018-09-05 | 2018-11-16 | 中国铁建重工集团有限公司 | Development machine and its knife of backbreaking |
| CN108825257B (en) * | 2018-09-05 | 2023-10-20 | 中国铁建重工集团股份有限公司 | Heading machine and super-digging cutter thereof |
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Application publication date: 20170804 |
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