CN208347782U - A kind of development machine slag-tapping system and driving machine equipment - Google Patents
A kind of development machine slag-tapping system and driving machine equipment Download PDFInfo
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- CN208347782U CN208347782U CN201821046795.XU CN201821046795U CN208347782U CN 208347782 U CN208347782 U CN 208347782U CN 201821046795 U CN201821046795 U CN 201821046795U CN 208347782 U CN208347782 U CN 208347782U
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- transfer pipeline
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- 238000011161 development Methods 0.000 title claims abstract description 65
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 44
- 238000012546 transfer Methods 0.000 claims abstract description 54
- 239000002893 slag Substances 0.000 claims description 23
- 239000000314 lubricant Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000005461 lubrication Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 7
- 230000032258 transport Effects 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 18
- 239000000243 solution Substances 0.000 description 10
- 239000013589 supplement Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000209202 Bromus secalinus Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses a kind of development machine slag-tapping systems, including dregs transfer pipeline, dregs pump and compressed air source unit, dregs pump is docked by dregs transfer pipeline with the outlet of the screw machine of development machine, outside the outlet end direct tunnel of dregs transfer pipeline, the entrance duct section of compressed air source unit and dregs transfer pipeline is connected, and dregs in conveying high-pressure air package pipeline is used for into dregs transfer pipeline.In the entrance of dregs transfer pipeline, compressed air source unit is set, by in dregs transmission process, it is passed through pressure-air into dregs pipeline and forms air film between transfer pipeline and dregs, dregs is wrapped up with this, it is formed " dregs packet ", it is suspended in pipe during outside conveying, reduce frictional resistance in transit, therefore discharge pressure needed for reducing conveying dregs, correspondingly reduce the energy consumption of pump installation, the pressure index requirement to pipeline relevant device is also reduced simultaneously, reduces equipment cost.The invention also discloses a kind of driving machine equipments.
Description
Technical field
The utility model relates to Boring Machine Technique fields to further relate to more specifically to a kind of development machine slag-tapping system
A kind of driving machine equipment.
Background technique
Development machine is most common equipment in constructing metro tunnel.When development machine tunnels, need to control surface subsidence, especially
When passing through ground has the locations such as house, highway, railway, Land-Subsidence Control is particularly important.For example soil pressure driving be with
Control slags tap to control and excavate storehouse soil pressure, prevents excavation storehouse pressure oscillation excessive, and then control surface subsidence.
In addition, it is the important link of tunneling construction logistics transportation that driving, which is slagged tap, slag discharge efficiency largely affects pick
Into construction efficiency.It is also frequently problem in tunneling construction that dregs, which is fallen, screw machine is gushed.Dregs, which is fallen, will affect tunnel
Environment in road, it is necessary to often want manual cleaning.It is the difficulty easily occurred when soil pressure driving passes through water rich strata that screw machine, which is gushed,
Topic, is easy to make face unstability, causes surface subsidence or collapsing, there is huge harm.
The design that conveyer belt cooperation slag-soil truck is generallyd use in currently available technology conveys dregs to outside tunnel, the design pair
Working environment of the slag-soil truck in tunnel forms biggish challenge, and relative inefficiencies, and easily falls dregs during transporting, and
It can not solve the risk that screw machine is gushed；Also have and dregs conveying, but the design are carried out using the design of pipeline auxiliary delivery pump
Due to dregs poor fluidity itself, pipeline inner pressure can be made big, the excessively high and opposite used pipeline equipment of transport energy consumption
Requirement to pressure is also higher, so generating higher equipment cost.
The technical problem of low efficiency at high cost etc. is conveyed in conclusion how to efficiently solve development machine and slag tap, is current
Those skilled in the art's urgent problem.
Utility model content
In view of this, first of the utility model is designed to provide a kind of development machine slag-tapping system, which goes out
The structure design of slag system, which can efficiently solve development machine and slag tap, conveys the technical problem of low efficiency at high cost etc., this is practical new
Second purpose of type is to provide a kind of driving machine equipment including above-mentioned development machine slag-tapping system.
In order to reach above-mentioned first purpose, the utility model is provided the following technical solutions:
A kind of development machine slag-tapping system, including dregs transfer pipeline, dregs pump and compressed air source unit, the dregs pump pass through institute
Dregs transfer pipeline is stated to dock with the outlet of the screw machine of development machine, outside the outlet end direct tunnel of dregs transfer pipeline, the gas
The entrance duct section of source device and the dregs transfer pipeline is connected, for the conveying high-pressure air packet into dregs transfer pipeline
Wrap up in dregs in pipeline.
Preferably, in above-mentioned development machine slag-tapping system, the development machine slag-tapping system further includes lubrication injection device, described
Lubrication injection device includes the lubricant canister being connected to the entrance duct section of the dregs transfer pipeline and lubricant output
Pump.
Preferably, in above-mentioned development machine slag-tapping system, the compressed air source unit includes air compressor machine and gas tank, the air compressor machine and
Air source control valve is provided between gas tank and the dregs transfer pipeline.
Preferably, in above-mentioned development machine slag-tapping system, the development machine slag-tapping system further includes master control set, the dregs
The pressure sensor for signal piping pressure, the master control set and the pressure sensor and gas are provided in transfer pipeline
Source control valve connection, for being passed through compressed air into pipeline after detecting that pressure is more than threshold value in dregs transfer pipeline.
Preferably, in above-mentioned development machine slag-tapping system, with compressed air source unit interval pre-determined distance, the dregs delivery pipe
Road is also connected with gas source supplementary device, makes up consumption for supplementing air into pipeline, the gas source supplementary device also includes sky
Press and gas tank.
Preferably, in above-mentioned development machine slag-tapping system, the dregs transfer pipeline is connected with long for flexible extension pipeline
The pipeline extension apparatus of degree.
Preferably, in above-mentioned development machine slag-tapping system, it is also connected with booster pump station on the dregs transfer pipeline, is used for
Pipeline reaches default and transports after, and the discharge pressure of loss is supplemented into pipeline, and the booster pump station includes that the second dregs pumps.
Preferably, in above-mentioned development machine slag-tapping system, the booster pump station further includes the gas source supplementary device and profit
Sliding injection device.
Preferably, in above-mentioned development machine slag-tapping system, the outlet end of the dregs transfer pipeline is provided with ejection protection machine
Structure, and the dregs hole outside direct tunnel.
Development machine slag-tapping system provided by the utility model, including dregs transfer pipeline, dregs pump and compressed air source unit, it is described
Dregs pump is docked by the dregs transfer pipeline with the outlet of the screw machine of development machine, and the outlet end of dregs transfer pipeline leads directly to tunnel
Outside road, the entrance duct section of the compressed air source unit and the dregs transfer pipeline is connected, for defeated into dregs transfer pipeline
Send dregs in pressure-air package pipeline.This slag-tapping system design, further exists on the basis of pipeline slags tap whole design
Compressed air source unit is arranged in the entrance of dregs transfer pipeline, by dregs transmission process, being passed through high pressure sky into dregs pipeline
Gas forms air film between transfer pipeline and dregs, wraps up dregs with this, is formed " dregs packet ", and " dregs packet " itself to
It is equivalent to and is suspended in pipeline during outer conveying, reduce contact of the dregs with pipeline inner wall, thus greatly reduce dregs
Frictional resistance in transit, therefore also just reduce using discharge pressure in pipeline needed for pipeline, the design pumped conveying dregs,
Also the energy consumption of pump installation is just correspondingly reduced, while also reducing the pressure index requirement to pipeline relevant device, reduces and sets
Standby cost；Further as the discharge pressure for reducing required offer in pipeline, therefore Pipeline transport distance is longer, Ke Nengxu
Want relay pump supplement discharge pressure when, the technical solution of the utility model can also greatly prolong adjacent relay pump between away from
From the quantity of setting relay pump, reduces equipment cost needed for reducing.In conclusion technical solution provided by the utility model,
High-efficiency and continuous is transported, required equipment cost and energy consumption are all lower, efficiently solve development machine in the prior art and slag tap and convey cost
The low technical problem of high efficiency.
In order to reach above-mentioned second purpose, the utility model additionally provides a kind of driving machine equipment, the driving machine equipment
Including any of the above-described kind of development machine slag-tapping system.Since above-mentioned development machine slag-tapping system has above-mentioned technique effect, having should
The driving machine equipment of development machine slag-tapping system should also have corresponding technical effect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the system structure diagram of development machine slag-tapping system provided by the embodiment of the utility model.
It is marked in attached drawing as follows:
Screw machine 1, dregs pump 2, gas tank 3, air compressor machine 4, lubricant canister 5, lubricant rear pump 6, pressure sensor 7, master
It controls device 8, pipeline extension apparatus 9, gas source supplementary device 10, air source control valve 11, booster pump station 12, dregs and cheats the 13, second slag
Soil pump 14, control valve 15.
Specific embodiment
The utility model embodiment discloses a kind of development machine slag-tapping system, with solve in the prior art development machine slag tap it is defeated
Send the technical problem of low efficiency at high cost etc..
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, Fig. 1 is the system structure diagram of development machine slag-tapping system provided by the embodiment of the utility model.
Development machine slag-tapping system provided by the utility model, including dregs transfer pipeline, dregs pump 2 and compressed air source unit, institute
It states dregs pump 2 and is docked by the dregs transfer pipeline with the outlet of the screw machine 1 of development machine, the outlet end of dregs transfer pipeline is straight
Outside logical tunnel, the entrance duct section of the compressed air source unit and the dregs transfer pipeline is connected, and is used for dregs transfer pipeline
Dregs in interior conveying high-pressure air package pipeline.This slag-tapping system design, passes through the pipe-line system with discharge pressure first
Dregs is conveyed, pipeline is docked with the outlet of screw machine 1, is provided lasting pressure to the outlet of screw machine 1, can be effectively reduced spiral shell
The risk that rotation machine 1 is gushed；
Compressed air source unit further is set in the entrance of dregs transfer pipeline on the basis of pipeline slags tap whole design, is led to
It crosses in dregs transmission process, pressure-air is passed through into dregs pipeline and forms air film between transfer pipeline and dregs, with
This package dregs, forms " dregs packet ", and " dregs packet " itself is equivalent to during outside conveying and is suspended in pipeline, subtracts
Few contact of the dregs with pipeline inner wall, thus greatly reduces dregs frictional resistance in transit, therefore also just reduce use
Discharge pressure in pipeline needed for the design of pipeline, pump conveys dregs, also just correspondingly reduces the energy consumption of pump installation, while also dropping
The low pressure index requirement to pipeline relevant device, reduces equipment cost；
Further as the discharge pressure for reducing required offer in pipeline, thus it is longer, possible in Pipeline transport distance
Need relay pump supplement discharge pressure when, the technical solution of the utility model can also greatly prolong adjacent relay pump between away from
From the quantity of setting relay pump, reduces equipment cost needed for reducing.In conclusion technical solution provided by the utility model,
High-efficiency and continuous is transported, required equipment cost and energy consumption are all lower, efficiently solve development machine in the prior art and slag tap and convey cost
The low technical problem of high efficiency.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the development machine slag-tapping system further includes lubrication injection device, and the lubrication injection device includes conveying with the dregs
The lubricant canister 5 and lubricant rear pump 6 of the entrance duct section connection of pipeline.
This slag-tapping system design provided in this embodiment also further increases lubrication injection device, by dregs
The lubricant canister 5 and rear pump of the entrance setting connection of transfer pipeline, are passed through lubricant, into pipeline so as to improve pipeline
Degree of lubrication, further decrease the transport resistance of dregs on the basis of " air film " design, lubricant can be according to different slags
Native situation and the geological condition of construction select water, bentonite, foaming agent or other greasing substances, therefore lubricant canister 5 and output
The adjustment that pump also carries out adaptability is selected, and adds the control valve 15 of lubricant output, preferably in order to supplement at any time.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the compressed air source unit includes air compressor machine 4 and gas tank 3, between the air compressor machine 4 and gas tank 3 and the dregs transfer pipeline
It is provided with air source control valve 11.
In technical solution provided in this embodiment, the design of compressed air source unit has been advanced optimized, gas is cooperated using air compressor machine 4
It is simple that the offer for being configured as gas source of tank 3 designs the design structure, the operation is stable, and is easily attached arrangement and is suitable in tunnel
Small space；The design ensure that the stability of the pressure size of output pressure simultaneously, and can persistently carry out gas when needed
The output of pressure ensure that the continuity for transportation work of slagging tap.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the development machine slag-tapping system further includes master control set 8, is provided in the dregs transfer pipeline for signal piping pressure
The pressure sensor 7 of power, the master control set 8 are connected to the pressure sensor 7 and air source control valve 11, are detected for working as
In dregs transfer pipeline pressure be more than threshold value after compressed air is passed through into pipeline.
In technical solution provided in this embodiment, the design of the above-mentioned fact has been advanced optimized, has been arranged in original basis logical
The master control set 8 of excess pressure induction, the pressure in real-time detection conveyance conduit, specific working method are as follows:
The pressure monitored when pressure sensor 7 rises the high-voltage value (preferably setting in 16bar or so) for reaching setting, sentences
The dregs for determining to have sufficient amount in pipeline needs to convey, and needs the injecting compressed air into pipeline at this time.Compressed air is by pneumatics
Machine 4 provides, and after 3 pressure stabilizing of gas tank, enters in the main pipeline of pumping dregs by valve；The compressed air filling time generally exists
2S-7S after compressed air enters main pipeline, can enter in the gap between tube wall and dregs, form gas between tube wall and dregs
Film wraps up dregs to form " dregs packet ".Since dregs has been separated with tube wall, " suspension " in pipeline, resistance will
Sharply decline, " dregs packet " quickly flows out tunnel under the thrust of dregs pump 2, into tunnel outside the equal environment in dregs hole 13 in.
Since " dregs packet " flow velocity of near exit is accelerated, dregs that can be freshly extruded with 2 outlet of dregs pump is disconnected, at this time pump discharge pressure
Can decline, when dropping to the pressure of setting, can stop input compressed air, dregs pump 2 continue working until pipeline inner pressure again
When the high pressure set point once risen, compressed air, such cycle operation are re-injected.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, be also connected with gas source supplementary device 10 with compressed air source unit interval pre-determined distance, the dregs transfer pipeline, for
Supplement air makes up consumption in pipeline, and the gas source supplementary device 10 also includes air compressor machine 4 and gas tank 3.
In technical solution provided in this embodiment, the lasting for airway dysfunction of system is optimized, due to wrapping up the air film of native slag
Can be lost in transmission process, for cope with long distance delivery, gas in pipelines lose the case where, between the compressed air source unit of Tu Zhabengchu
Gas source supplementary device 10 is set every a certain distance, air compressor machine 4 and gas tank 3 therein can directly adopt the gas source near native pulp pump
Other air compressor machines 4 and air pump can also be separately provided in the air compressor machine 4 and air pump of device.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the dregs transfer pipeline is connected with for the flexible pipeline extension apparatus 9 for extending length of pipe.It is provided in this embodiment
Technical solution, primarily to reply development machine continues the case where tunneling forward, by pipeline extension apparatus 9 to dregs delivery pipe
Road carries out elongation appropriate to adapt to the variation of development machine position, high easily makes to avoid taking over the pipe being likely to occur again and pressing through
The case where at the accident of ejection.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, it is also connected with booster pump station 12 on the dregs transfer pipeline, is transported after for reaching default in pipeline, to pipeline
The discharge pressure of interior supplement loss, the booster pump station 12 include the second dregs pump 142.
Booster pump station 12 is arranged in technical solution provided by the utility model, in order to adapt to the requirement of long distance delivery
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the booster pump station 12 further includes the gas source supplementary device 10 and lubrication injection device.
To advanced optimize above-mentioned technical proposal, on the basis of the above embodiments preferably, above-mentioned development machine goes out slag system
In system, the outlet end of the dregs transfer pipeline is provided with ejection protection mechanism, and the dregs hole 13 outside direct tunnel.
The development machine slag-tapping system provided in based on the above embodiment, the utility model additionally provide a kind of development machine and set
Standby, which includes any one development machine slag-tapping system in above-described embodiment.Since the driving machine equipment uses
Development machine slag-tapping system in above-described embodiment, so the beneficial effect of the driving machine equipment please refers to above-described embodiment.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of development machine slag-tapping system, which is characterized in that including dregs transfer pipeline, dregs pump and compressed air source unit, the slag
Soil pump is docked by the dregs transfer pipeline with the outlet of the screw machine of development machine, the outlet end direct tunnel of dregs transfer pipeline
Outside, the entrance duct section of the compressed air source unit and the dregs transfer pipeline is connected, for conveying into dregs transfer pipeline
Pressure-air wraps up dregs in pipeline.
2. development machine slag-tapping system according to claim 1, which is characterized in that the development machine slag-tapping system further includes profit
Sliding injection device, the lubrication injection device includes the lubricant canister being connected to the entrance duct section of the dregs transfer pipeline
And lubricant rear pump.
3. development machine slag-tapping system according to claim 1, which is characterized in that the compressed air source unit includes air compressor machine and gas
Air source control valve is provided between tank, the air compressor machine and gas tank and the dregs transfer pipeline.
4. development machine slag-tapping system according to claim 3, which is characterized in that the development machine slag-tapping system further includes master
Device is controlled, the pressure sensor for signal piping pressure, the master control set and institute are provided in the dregs transfer pipeline
State pressure sensor and air source control valve connection, for after detecting in dregs transfer pipeline pressure more than threshold value into pipeline
It is passed through compressed air.
5. development machine slag-tapping system according to claim 3 or 4, which is characterized in that default with the compressed air source unit interval
Distance, the dregs transfer pipeline are also connected with gas source supplementary device, make up consumption, the gas for supplementing air into pipeline
Source supplementary device also includes air compressor machine and gas tank.
6. development machine slag-tapping system according to claim 5, which is characterized in that the dregs transfer pipeline, which is connected with, to be used for
The flexible pipeline extension apparatus for extending length of pipe.
7. development machine slag-tapping system according to claim 5, which is characterized in that be also connected on the dregs transfer pipeline
Booster pump station transports after for reaching default in pipeline, the discharge pressure of loss, the booster pump station is supplemented into pipeline
It is pumped including the second dregs.
8. development machine slag-tapping system according to claim 7, which is characterized in that the booster pump station further includes the gas source
Supplementary device and lubrication injection device.
9. development machine slag-tapping system according to claim 5, which is characterized in that the outlet end of the dregs transfer pipeline is set
It is equipped with ejection protection mechanism, and the dregs hole outside direct tunnel.
10. a kind of driving machine equipment, which is characterized in that go out slag system including development machine as described in any one of claim 1 to 9
System.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821046795.XU CN208347782U (en) | 2018-07-03 | 2018-07-03 | A kind of development machine slag-tapping system and driving machine equipment |
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| CN201821046795.XU CN208347782U (en) | 2018-07-03 | 2018-07-03 | A kind of development machine slag-tapping system and driving machine equipment |
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| CN208347782U true CN208347782U (en) | 2019-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678766A (en) * | 2018-07-03 | 2018-10-19 | 中国铁建重工集团有限公司 | A kind of development machine slag-tapping system and driving machine equipment |
-
2018
- 2018-07-03 CN CN201821046795.XU patent/CN208347782U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678766A (en) * | 2018-07-03 | 2018-10-19 | 中国铁建重工集团有限公司 | A kind of development machine slag-tapping system and driving machine equipment |
| CN108678766B (en) * | 2018-07-03 | 2024-07-19 | 中国铁建重工集团股份有限公司 | Slag discharging system of heading machine and heading machine equipment |
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Address after: 410100 No. 88 East 7 Line, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Patentee after: China Railway Construction Heavy Industry Co.,Ltd. Address before: 410100 No. 88 East 7 Line, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Patentee before: China Railway Construction Heavy Industry Co.,Ltd. |
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