WO2005054629A1 - Hydraulische schaltung für den strebausbau - Google Patents
Hydraulische schaltung für den strebausbau Download PDFInfo
- Publication number
- WO2005054629A1 WO2005054629A1 PCT/DE2004/002546 DE2004002546W WO2005054629A1 WO 2005054629 A1 WO2005054629 A1 WO 2005054629A1 DE 2004002546 W DE2004002546 W DE 2004002546W WO 2005054629 A1 WO2005054629 A1 WO 2005054629A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- pressure
- valves
- line
- return
- Prior art date
Links
- 230000004913 activation Effects 0.000 claims abstract 2
- 238000010276 construction Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 230000007257 malfunction Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/004—Fluid pressure supply failure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/30515—Load holding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
Definitions
- the invention relates to a hydraulic circuit for longwall construction according to the preamble of claim 1.
- Such circuits are generally known and in use. These are hydraulic systems controlled by their own pressure. With these, the pump pressure of the hydraulic circuit is used to also carry out the hydraulic pilot control of the valves. This procedure has prevailed in the expansion control. It allows you to make do with just two supply lines in the longwall.
- the hydraulic pilot control commands are generated via separate control valves, which work independently of the load pressure or pump pressure and which are supplied with pressure medium via separate pressure lines.
- such a system also includes a separate return of all control volumes. This also increases the amount of tubing required. If errors occur, it is very difficult to locate the error, since it cannot be ruled out that the two pressure supplies, i.e. Influence the working pressure supply and the pilot pressure supply.
- the valve constructions are also technically much more complex due to the need to decouple the working pressure from the pilot pressure, particularly with regard to pressure equalization and sealing.
- the high safety standards in mining also require a large amount of protective measures in view of the high level of complexity and the large number of control elements and switching elements, especially control valves and load holding valves, even with self-pressure controlled hydraulic systems.
- the basic principle here is that the hydraulic system for shield removal must ensure that, despite the large number of possible operating conditions, including non-permitted operating states or unscheduled malfunctions, the underground personnel can also stay safely under the shields in the longwall area.
- the object of the invention is to design the hydraulic systems which are in use and controlled by their own pressure in such a way that life-threatening and costly malfunctions of this type cannot occur, and the retrofitting of existing systems is also possible without substantial conversion work.
- the solution according to claim 1 is based on the unexpected finding that in the event of malfunctions in the pumping system, despite the emergency shutdown of the entire electrical and hydraulic control system, there are unforeseen operating conditions in which pressure conditions arise which are necessary for the hydraulic pilot control, i.e. Sufficient opening of important valves is sufficient.
- the check valve according to the invention can, for. B. switched by a pressure sensor in the reverse direction, which detects the pump pressure. In any case, the circuit is switched so that the shut-off valve opens when there is a pressure drop from the pump branch line to the working cylinder.
- the embodiment according to claim 2 is characterized in that it does not require an external control and is therefore reliable on the one hand and simple on the other hand can be retrofitted.
- Figure 1 The hydraulic circuit of a strut
- FIG. 2 The valves for a power transmitter of a rack
- the longwall supply line (pumps - manifold.flow), which extends over part or all of the longwall and which is connected to the pump station (not shown).
- the hydraulic control device for a power transmitter.
- the hydraulic control device is connected via the feed stub 12 to the feed and via the return stub 13 to the return.
- a power transmitter shown here as a cylinder-piston unit.
- the electrical control unit shield control for controlling the hydraulic control unit. It receives its switching commands from the central longwall control device 15.
- the hydraulic control unit includes several valves. These are indicated in the schematic diagram in FIG. 2. Basically, the connection (pump branch line) of each force transmitter to the pump manifold of the strut is blocked by a check valve 14, so that in the event of failure of the pump pressure, the holding pressure of the force transmitter rests on the tightly closing check valve.
- this check valve 14 can be unlocked by hydraulic pilot control by the system pressure if the Pressure difference from load pressure and pilot pressure drops below a value specified by the valve construction.
- the check valve 14 is hydraulically connected so that when the hydraulic actuator is unlocked, the working area of the power transmitter is connected to the return manifold via the return branch line. Such an unlockable check valve is such. B. known from DE 3804 848 A1.
- the check valve 6 now prevents, in the event of unintentional unlocking (opening) of this check valve 14, which acts as a load holding valve, pressure medium from the cylinder space of the force transmitter into the pump line.
- the pump stub line between the encoder and the pump manifold is therefore blocked.
- a plurality of pressure sensors 7 are arranged at a distance from one or more expansion racks in the pump manifold (face supply line 1). These pressure sensors ensure that a certain minimum pressure of e.g. B. 200 bar is in any case in the pump manifold. Otherwise, the electrical system 5 is switched off, by means of which the shield actuation is switched on. This prevents the electrical system for activating the shield from being switched on if the minimum pressure of 200 bar has not been reached.
- Pressure sensors 8 are provided in the return manifold. For example, three such pressure sensors 8 are distributed over the face length. These sensors monitor that a certain maximum pressure is not exceeded in the return, e.g. B. 30 bar. These sensors 8 switch off the electronics 5 when the maximum pressure of 30 bar is reached, so that valve actuation is no longer possible.
- the drop has a large amount of liquid in the return line with a corresponding increase in the dynamic pressure and, on the other hand, a decrease in the load pressure, by means of which the unlockable check valve 14 is held in its blocking position. This creates the risk of the check valve opening still further, since the pressure ratio required for closing is no longer maintained when the load pressure drops on the one hand and the return pressure rises on the other.
- Undefined hydraulic situations can also result from the fact that when the pumps are restarted (restarted), the pressure in the pump manifold, which is some 100 m long, does not rise quickly enough, so that on the one hand the piloted valves are already switched, on the other hand, the pump pressure is not sufficient to bear the load of the rock. In this case too, the working cylinders can sag. Because of this, be in the pump manifold at a distance of several, e.g. B. 3 shields controllable shut-off valves 10 installed, which are initially blocked when the pumps start and are switched on and opened one after the other by the central electrical control of the strut.
- the invention and the further measures which can also be used and are effective in themselves avoid the dangerous situation in which a single common connection to all control units of the strut is created when the solenoid valve is switched and the pump pressure in the strut is absent.
- there may be runs in the valves because the system pressure monitoring is not in operation if the pumps fail or the pump pressure is too low.
- the valves allow a constant volume flow to flow into the collective return line and when the critical control pressure limit is reached, the load-holding valve is released (check valve that can be unlocked).
- Stamps that are not set or that are only set at low pressure are particularly at risk here, since the opening pressure of the load holding valves is dependent on the load pressure, as explained above.
- Also hydraulically relieved load holding valves, the opening force of which depend on a spring force have a sufficient opening pressure at e.g. B. only 40 bar.
- the blocking valves 9 prevent the volumes of the shield punches and cylinders from acting in the pressure-loaded state like a pump, which, at too low a pressure, lead to a rearward and inadequate feed into the neighboring shields, where the effective actuation and The load holding valves are unlocked, which in turn frees up further volumes that lead to further chain reactions.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004295371A AU2004295371B2 (en) | 2003-11-29 | 2004-11-18 | Hydraulic circuit for longwall supports |
DE112004002056T DE112004002056D2 (de) | 2003-11-29 | 2004-11-18 | Hydraulische Schaltung für den Strebausbau |
US11/420,317 US7478884B2 (en) | 2003-11-29 | 2006-05-25 | Hydraulic switching mechanism for longwall supports |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10356421 | 2003-11-29 | ||
DE10356421.7 | 2003-11-29 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/420,317 Continuation US7478884B2 (en) | 2003-11-29 | 2006-05-25 | Hydraulic switching mechanism for longwall supports |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005054629A1 true WO2005054629A1 (de) | 2005-06-16 |
Family
ID=34638277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2004/002546 WO2005054629A1 (de) | 2003-11-29 | 2004-11-18 | Hydraulische schaltung für den strebausbau |
Country Status (7)
Country | Link |
---|---|
US (1) | US7478884B2 (de) |
CN (1) | CN1886575A (de) |
AU (1) | AU2004295371B2 (de) |
DE (1) | DE112004002056D2 (de) |
PL (1) | PL203380B1 (de) |
RU (1) | RU2337243C2 (de) |
WO (1) | WO2005054629A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008009722A1 (de) * | 2008-02-19 | 2009-08-20 | Marco Systemanalyse Und Entwicklung Gmbh | Ventilanordnung |
WO2011006461A2 (de) | 2009-07-16 | 2011-01-20 | Tiefenbach Control Systems Gmbh | Hydraulische schaltung für den strebausbau |
CN101403312B (zh) * | 2007-10-05 | 2013-07-24 | 玛珂***分析和开发有限公司 | 阀装置以及包括该阀装置的支撑架 |
CN103670459A (zh) * | 2013-11-30 | 2014-03-26 | 河北工业大学 | 一种矿用液压支柱压力实时监测仪 |
US8876218B2 (en) | 2009-07-16 | 2014-11-04 | Tiefenbach Control Systems Gmbh | Hydraulic circuit for longwall support |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007049604B4 (de) * | 2007-10-16 | 2014-08-21 | Marco Systemanalyse Und Entwicklung Gmbh | Ventilanordnung |
EP2378060B1 (de) * | 2010-04-16 | 2012-12-05 | S.A. Armstrong Limited | Verbesserungen bei und im Zusammenhang mit langwandigen hydraulischen Zuführsystemen |
DE102011101087A1 (de) * | 2010-05-13 | 2012-03-01 | Tiefenbach Control Systems Gmbh | Steuereinrichtung einer Ausbaueinheit im Streb eines Bergwerks |
CN101818649B (zh) * | 2010-05-15 | 2011-09-28 | 张小康 | 综掘工作面液压支护装置 |
CN101893007B (zh) * | 2010-07-23 | 2012-07-25 | 吴旭 | 柱塞缸升降液压控制*** |
CN102116165B (zh) * | 2011-02-24 | 2013-09-25 | 华中科技大学 | 煤矿液压支架控制装置及其集散控制*** |
US8850806B2 (en) | 2011-06-28 | 2014-10-07 | Caterpillar Inc. | Hydraulic control system having swing motor energy recovery |
US8776511B2 (en) | 2011-06-28 | 2014-07-15 | Caterpillar Inc. | Energy recovery system having accumulator and variable relief |
US8919113B2 (en) | 2011-06-28 | 2014-12-30 | Caterpillar Inc. | Hydraulic control system having energy recovery kit |
US9068575B2 (en) | 2011-06-28 | 2015-06-30 | Caterpillar Inc. | Hydraulic control system having swing motor energy recovery |
US9139982B2 (en) | 2011-06-28 | 2015-09-22 | Caterpillar Inc. | Hydraulic control system having swing energy recovery |
CN102373940A (zh) * | 2011-11-18 | 2012-03-14 | 郑州煤矿机械集团股份有限公司 | 液压支架控制器 |
RU2691793C2 (ru) * | 2014-08-28 | 2019-06-18 | ДЖОЙ ГЛОБАЛ АНДЕРГРАУНД МАЙНИНГ ЭлЭлСи | Мониторинг крепления кровли в системе сплошной разработки |
CN105386784A (zh) * | 2015-12-07 | 2016-03-09 | 太原科技大学 | 一种液压支架供液回路及控制方法 |
CN105545836B (zh) * | 2016-01-28 | 2017-04-12 | 河南骏通车辆有限公司 | 自卸车调平用副车架调平液压控制*** |
CN106640166B (zh) * | 2016-12-20 | 2019-09-10 | 中国神华能源股份有限公司 | 用于液压支架的泄液回收装置及液压*** |
CN108591180B (zh) * | 2018-04-12 | 2020-02-07 | 陕西陕煤黄陵矿业有限公司 | 一种综采工作面液压***监测方法 |
CN112814719A (zh) * | 2020-12-31 | 2021-05-18 | 重庆大学 | 一种液压支架智能感控方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4320207A1 (de) * | 1993-06-18 | 1994-12-22 | Ecker Gmbh Maschbau | Vorrichtung zur Nachbarschaftssteuerung von Ausbaugestellen im Schreitausbau unter Tage |
US5490384A (en) * | 1994-12-08 | 1996-02-13 | Caterpillar Inc. | Hydraulic flow priority system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019607C2 (de) * | 1990-06-20 | 1994-02-17 | Hemscheidt Maschf Hermann | Steuersystem für Ausbaugestelle eines Strebs |
DE10310893B4 (de) * | 2003-03-11 | 2015-07-02 | Caterpillar Global Mining Europe Gmbh | Anordnung aus hydraulischen Bauteilen sowie Aktoren und/oder Sensoren für den untertägigen Bergbau |
-
2004
- 2004-11-18 PL PL379765A patent/PL203380B1/pl unknown
- 2004-11-18 WO PCT/DE2004/002546 patent/WO2005054629A1/de active Application Filing
- 2004-11-18 CN CNA2004800353116A patent/CN1886575A/zh active Pending
- 2004-11-18 RU RU2006123004/03A patent/RU2337243C2/ru not_active IP Right Cessation
- 2004-11-18 DE DE112004002056T patent/DE112004002056D2/de not_active Ceased
- 2004-11-18 AU AU2004295371A patent/AU2004295371B2/en not_active Ceased
-
2006
- 2006-05-25 US US11/420,317 patent/US7478884B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4320207A1 (de) * | 1993-06-18 | 1994-12-22 | Ecker Gmbh Maschbau | Vorrichtung zur Nachbarschaftssteuerung von Ausbaugestellen im Schreitausbau unter Tage |
US5490384A (en) * | 1994-12-08 | 1996-02-13 | Caterpillar Inc. | Hydraulic flow priority system |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101403312B (zh) * | 2007-10-05 | 2013-07-24 | 玛珂***分析和开发有限公司 | 阀装置以及包括该阀装置的支撑架 |
DE102008009722A1 (de) * | 2008-02-19 | 2009-08-20 | Marco Systemanalyse Und Entwicklung Gmbh | Ventilanordnung |
DE102008009722B4 (de) * | 2008-02-19 | 2012-08-23 | Marco Systemanalyse Und Entwicklung Gmbh | Ventilanordnung |
WO2011006461A2 (de) | 2009-07-16 | 2011-01-20 | Tiefenbach Control Systems Gmbh | Hydraulische schaltung für den strebausbau |
US8876218B2 (en) | 2009-07-16 | 2014-11-04 | Tiefenbach Control Systems Gmbh | Hydraulic circuit for longwall support |
US8960807B2 (en) | 2009-07-16 | 2015-02-24 | Tiefenbach Control Systems Gmbh | Hydraulic circuit for longwall mining |
CN103670459A (zh) * | 2013-11-30 | 2014-03-26 | 河北工业大学 | 一种矿用液压支柱压力实时监测仪 |
Also Published As
Publication number | Publication date |
---|---|
US7478884B2 (en) | 2009-01-20 |
CN1886575A (zh) | 2006-12-27 |
RU2337243C2 (ru) | 2008-10-27 |
DE112004002056D2 (de) | 2006-07-13 |
PL379765A1 (pl) | 2006-11-13 |
AU2004295371A1 (en) | 2005-06-16 |
PL203380B1 (pl) | 2009-09-30 |
AU2004295371B2 (en) | 2009-07-16 |
RU2006123004A (ru) | 2008-01-10 |
US20070044647A1 (en) | 2007-03-01 |
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