CN102330561A - Method for controlling protective plate - Google Patents
Method for controlling protective plate Download PDFInfo
- Publication number
- CN102330561A CN102330561A CN2011101825722A CN201110182572A CN102330561A CN 102330561 A CN102330561 A CN 102330561A CN 2011101825722 A CN2011101825722 A CN 2011101825722A CN 201110182572 A CN201110182572 A CN 201110182572A CN 102330561 A CN102330561 A CN 102330561A
- Authority
- CN
- China
- Prior art keywords
- pressure
- pressure regulator
- regulator valve
- valve
- measurement piston
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000001681 protective effect Effects 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- E21D23/12—Control, e.g. using remote control
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Safety Valves (AREA)
- Fluid-Driven Valves (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Control And Safety Of Cranes (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a method for controlling a protective plate. Wherein when a cover support is dismounted, the adjacent cover support is pushed away through a split cylinder and a straightening cylinder, wherein the split and the straightening cylinder respectively possesses a pressure adjusting valve.
Description
Technical field
The present invention relates to a kind of method that is used for carrying out at underground mining backplate control, wherein shield support is arranged on the division cylinder (Spaltzylinder) in the shielding cover plate zone and is arranged on aligning cylinder (Richtzylinder) in the shielding slide plate zone through at least one from pushing open with the contiguous shield support of this shield support through at least one when removing.
Background technology
The division cylinder can be in this bottom that is arranged on the division cover plate, and this explosion cover plate can prevent the loosening rubble landing between single backplate or shield support.Simultaneously, such division cylinder is the supporter for adjacent backplate at the cover plate place.
At present, the division cylinder loads supply pressure with aligning cylinder (propulsion plant) through switch valve.
Summary of the invention
The objective of the invention is to, a kind of method that is used for carrying out at underground mining backplate control is provided, utilize this method can be in the exploitation situation that tilts the safety that improves with respect to the upset of adjacent backplate to be provided with low cost.
This purpose realizes through the described characteristic of claim 1, and particularly realizes thus, promptly divides cylinder and loads the maximum pressure that reduces with the aligning cylinder, and this maximum pressure is derived by pressure duct through each one self pressure regulator valve.Therefore divide cylinder and not only be separated from each other the ground on-load pressure, and can regulate pressure respectively differently for these two cylinders with the aligning cylinder.In addition, according to the present invention, the maximum pressure that reduces does not provide through extra low pressure line, but this pressure is passed through to be derived by the pressure duct that in work plane, always provides for dividing cylinder and being the preset pressure regulator valve of aligning cylinder.
According to the present invention, when low cost, guarantee to select bigly to make that backplate is supported on the power on its adjacent backplate just in time like this, thereby prevent on the one hand to glide and can not overturn on the other hand.
According to another aspect of the present invention, the present invention relates to a kind of pressure regulator valve that is used to implement said method, this pressure regulator valve comprises valve body, and valve body has the inlet that is used for high pressure, lead to the outlet of backflow and the outlet of the fluid pressure that is used to reduce.At this, in valve body, be provided with the measurement piston that has loaded adjustable elastic force, this measurement piston have the outlet of the fluid pressure that is used to reduce and lead between the outlet of backflow, can be by the passage of needle sealing.Through having loaded the measurement piston of adjustable elastic force, can select the maximum pressure that reduces expected, from this value, measure the power that piston overcomes spring and opens, so that the hydraulic pressure of the outlet of the fluid pressure that restriction arrival is used to reduce.Can be connected with corresponding return line with existing pressure duct in work plane according to valve of the present invention, wherein in the exit of the fluid pressure that is used to reduce hydraulic pressure is provided, this hydraulic pressure does not surpass the value of regulating, the maximum pressure that promptly reduces.Can realize regulating the maximum pressure that reduces of expectation with simple mode thus, promptly press to the spring of measuring piston and more or less be screwed in the valve body.
Favourable embodiment of the present invention is explained in manual, accompanying drawing and dependent claims.
An embodiment according to this invention also can be advantageously; By affiliated spring needle is pressed to the direction of measuring piston, this is because be closed under passive state in the outlet of the fluid pressure that is used to reduce and the passage that leads between the outlet of backflow in this case.
In addition can be advantageously, promptly in valve body, be provided with between the outlet of inlet that is used for high pressure and the fluid pressure that is used to reduce, can be by the passage of needle sealing.In this way, when the pressure that exists in the exit of the fluid pressure that is used to reduce had met or exceeded the maximum pressure of adjusting, needle can turn-off other tributary of the fluid that under high pressure forms, seals its fluid then.If at the pressure in the exit of the fluid pressure that is used to reduce because outside, act on the power on the backplate and desirably do not raise; Measure the preregulated power that piston overcomes spring so and push open, thereby make the fluid can be through flowing out in the outlet of the fluid pressure that is used to reduce and the passage that leads between the outlet of backflow by needle.
Can be advantageously for good and safe mode of operation, spring will be measured piston and press to the block that is fixed on the housing under passive state.In addition can be advantageously; Second block is set, and the motion that piston overcomes elastic force is measured in its restriction, and this is because can guarantee in this case; Even when violent compression shock; The connecting portion that leads to backflow also remains to be opened, and behind compression shock, all parts of valve are on the position of its expectation.
According to another implementation of the invention, at least one is resisted against measures the stop surface that the block on the piston can have spherical designs, this stop surface and spherical opposite face acting in conjunction.In this way, can the upset that cause through the spring that does not apply the power of accurately axially pointing to be compensated.
By the same token can be advantageously, promptly spring is implemented in the coupling of measuring on the piston through spherical.Therefore the coefficient spring base of spherical special and the measurement piston for example can be set.Can design like this at this spring base, i.e. contact between spring base and the measurement piston contacts along the mating face of sphere or through approximate straight line and realizes.
Description of drawings
Followingly the present invention exemplarily is described according to favourable embodiment and with reference to accompanying drawing is pure.Shown in the figure:
Fig. 1 is the cross section of passing pressure regulator valve;
Fig. 2 is the partial enlarged drawing of Fig. 1 middle section;
Fig. 3 is the hydraulic solution with three division cylinders and an aligning cylinder; With
Fig. 4 is the hydraulic solution of another embodiment with automatic control equipment of pressure regulator valve.
The specific embodiment
Fig. 1 shows the sectional view that passes pressure regulator valve, and this pressure regulator valve comprises valve body 10, and valve body has the inlet 11 that is used for high pressure P, the outlet 14 of leading to backflow R and the outlet 12 of the fluid pressure A that is used to reduce.At this, inlet 11 is connected on existing, the feed-in pipe with high pressure P in the work plane, and exports 14 and be connected on the corresponding return duct R.The outlet 12 of the fluid pressure A that is used to reduce can be connected the division cylinder or align cylinder.
As illustrated in fig. 1 and 2; Spring housing 16 is screwed in the central hole of passing through the sealing ring sealing of valve body 10; In this spring housing, held helical spring 17; This helical spring free end is pressed on the flange 18 of measuring piston 20, and its flange 18 is resisted against the bottom of spiral insertion section 22 under the state that the nothing that illustrates is pressed.Spiral insertion section 22 has the cross section of classification and is screwed into hermetically in the axial through bore of valve body 10.Center in spiral insertion section 22 is provided with central hole, during measurement piston 20 inserts hermetically and should bore a hole.
Measure piston 20 and import 22 inside, spiral insertion section hermetically, and have central blind hole 24, this blind hole constituted the outlet 12 of the fluid pressure A that is used to reduce and lead to passage 24 between the outlet 14 of backflow R '.On right part blind hole 24, among the figure, installed and cross-perforating 26 that it intersects, this cross-perforating forms hole 24 connecting portions to outlet 14.
In valve body 10, more accurately say so and be furnished with another seal receptacle 38 in right part spiral insertion section 36, in the drawings, utilize this another seal receptacle can be enclosed in the passage 39 between inlet 11 that is used for high pressure P and the outlet 12 of the fluid pressure A that is used to reduce.Another valve cone 40 that is molded on the needle 32 is used to seal.
As especially shown in figure 2; Under the state that (illustrating) nothing is pressed, be arranged in the seal receptacle 38 in the passage 39 of valve body 10 and be arranged in the passage 24 of measuring piston 20 ' in seal receptacle 28 between axial spacing less than the axial spacing between the affiliated valve cone 40 and 30 on the needle 32.Can under the state of do not have pressing, guarantee that valve cone 40 is not resisted against on the seal receptacle 38 in this way, connect thereby between the interface 12 of feed-in mouth P and the fluid pressure A that is used to reduce, exist to flow.Under this state, passage 20 is through being resisted against valve cone 30 sealings on the valve seat 28 simultaneously.
When supply pressure P is about 300bar, through spring housing 16 is screwed in the valve body 10 more or less, can about 15 to about 250bar very on a large scale in be adjusted in the output pressure that interface 12 places of the fluid pressure A that is used to reduce form.Can change thus and make spring 17 press to the power of measuring piston 20.
In service normally, the valve that illustrates is through interface 11 supply high pressure P, and hydraulic fluid at first flows to the outlet 12 of the fluid pressure A that is used to reduce through the passage in the seal receptacle 38 39.Simultaneously, utilize this pressure to be pressed onto and measure on the piston 20, the measurement piston is remained in its position by spring 17.When the pressure that exists reaches the power corresponding to the elastic force of regulating, the measurement piston 20 among Fig. 2 moves right so, and wherein needle 32 is resisted against on the seal receptacle 38 and closed channel 39 because the power of spring 34 moves right simultaneously until valve cone 40.In this state, the connection between P and the A is closed, and interface 12 places have applied the maximum pressure of regulating, and this maximum pressure reduces with respect to supply pressure P.If but the pressure that is applied to interface 12 places continues to raise because of external force; The power that makes measurement piston 20 overcome Fig. 1 medi-spring 17 so moves right; Thereby lift the measurement piston 20 in the zone of seal receptacle 28 by valve cone 30 and open the connecting portion that leads to backflow R, thereby pressure fluid flow is gone out and make pressure reduce to the pressure of preset once more.
Through using two above-mentioned pressure regulator valves, can make division cylinder and aligning cylinder load the maximum pressure that reduces, wherein this maximum pressure that reduces is derived by pressure duct P through pressure regulator valve respectively.Can regulate the maximum pressure that is used for each cylinder dividually through using two pressure regulator valves that separate.
Fig. 3 shows a kind of hydraulic solution, and wherein above-mentioned pressure regulator valve is used to divide cylinder S and aligning cylinder Z.The piston area of cylinder respectively the interface A and pressure regulator valve through the maximum pressure that is used for reducing any be connected.The ring surface of each cylinder is connected with backflow R.Be furnished with the flap valve 50 that the function that makes two pressure regulator valves is separated at the return line that is used for aligning cylinder Z of pressure regulator valve.
Valve shown in the module 60 is the Different control valve, be used for plunger for example, upset cover plate, or under the like of shield support.In addition, give pressure regulator valve 52 and 54 supply high pressure through two valves that illustrate.
At the figure shown in Fig. 4 two pressure regulator valves 52 and 54 through hydraulic pressure logic device control are shown once more.In this embodiment, unlatching is used for aligning cylinder Z and divides the function that cylinder S handles automatically through the dismounting shield support, and closes this function once more through setting.If remove two plungers 56 and 58; The piston area interface that then makes plunger 56 and 58 is by means of the valve that is arranged in the module 60; As illustratedly be connected with refluxing; Thereby 2/2 reversal valves 62 that are connected before pressure regulator valve 52 and 54 are opened, and pressure regulator valve 52 is connected with pressure duct P with 54 high voltage interface 11.On the contrary, if two plungers 56 and 58 are set once more, the piston area of plunger has loaded high pressure so, thereby makes valve 62 sealings, and thus pressure regulator valve 52 and 54 is separated with the high voltage supply device.
Above-mentioned pressure regulator valve has scale on the external diameter of shaped spiral housing 16, this scale can be represented the pressure regulated.According to the entering situation, be sideways pitch, depth of stratum, the weight of shield support, its center of gravity and can calculate pressure according to the area of the cylinder of division cover plate, division cover plate or one or more division cylinders should utilize this pressure support on adjacent backplate.The suspension that can calculate backplate in addition drives, and the support force of division cover plate can reduce thus, and can calculate for preventing that the backplate pedestal from gliding and necessary pressure according to the power of remaining necessity and the area of aligning cylinder.
Claims (10)
1. one kind is used for carrying out the method that backplate is controlled at underground mining; Wherein shield support is arranged on the division cylinder (S) in the shielding cover plate zone and is arranged on aligning cylinder (Z) in the shielding slide plate zone through at least one from pushing open with the contiguous shield support of said shield support through at least one when removing; Wherein said division cylinder and said aligning cylinder load the maximum pressure that reduces, and said maximum pressure is derived by pressure duct (P) through each one self pressure regulator valve.
2. method according to claim 1 is characterized in that, is the maximum pressure of two said pressure regulator valves of each pressure regulator valve separate regulation.
3. pressure regulator valve that is used to implement method according to claim 1 and 2; Comprise valve body (10); Said valve body has the inlet (11) that is used for high pressure (P), the outlet (14) of leading to backflow (R) and the outlet (12) of the fluid pressure (A) that is used to reduce; Wherein in said valve body (10), be provided with the measurement piston (20) that has loaded adjustable elastic force (17), said measurement piston have the said outlet (12) of the said fluid pressure (A) that is used to reduce and said lead between the outlet (14) of backflow (R), can be by the passage (24 ') of needle (32) sealing.
4. pressure regulator valve according to claim 3 is characterized in that, said needle (32) is pressed to the direction of said measurement piston (20) by spring (34).
5. according to claim 3 or 4 described pressure regulator valves; It is characterized in that, in said valve body (10), be provided with between the said outlet (12) of the said said fluid pressure (A) that is used for the inlet (11) of high pressure (P) and is used to reduce, can be by the passage (39) of said needle (32) sealing.
6. pressure regulator valve according to claim 5; It is characterized in that, in the said passage (39) of said valve body (10) and in the said passage (24 ') of said measurement piston (20), be furnished with seal receptacle (38,28) respectively; Wherein under passive state; Axial spacing between two said seal receptacles (38,28) is less than the axial spacing between the corresponding valve cone (40,30) on the said needle (32).
7. according at least one described pressure regulator valve in the claim 3 to 6; It is characterized in that; Spring (17) is pressed to block with said measurement piston (20) under said passive state, second block that the said measurement piston of restriction (20) overcomes the motion of said elastic force wherein is set especially.
8. pressure regulator valve according to claim 7 is characterized in that at least one block has the stop surface of spherical designs, said stop surface and spherical opposite face acting in conjunction.
9. according at least one described pressure regulator valve in the claim 3 to 8, it is characterized in that said spring (17) is implemented in the coupling on the said measurement piston (20) through spherical.
10. according at least one described pressure regulator valve in the claim 3 to 9; It is characterized in that; For realize said spring (17) on said measurement piston (20) coupling and spring base is set, the special spherical acting in conjunction with said measurement piston (20) of said spring base.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010026977.8 | 2010-07-13 | ||
| DE102010026977.8A DE102010026977B4 (en) | 2010-07-13 | 2010-07-13 | Method for shield control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102330561A true CN102330561A (en) | 2012-01-25 |
| CN102330561B CN102330561B (en) | 2014-03-12 |
Family
ID=45402740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110182572.2A Expired - Fee Related CN102330561B (en) | 2010-07-13 | 2011-06-30 | Method for controlling protective plate |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN102330561B (en) |
| DE (1) | DE102010026977B4 (en) |
| PL (1) | PL213628B1 (en) |
| RU (1) | RU2477797C1 (en) |
| UA (2) | UA101865C2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108026834A (en) * | 2015-06-18 | 2018-05-11 | Avl 里斯脱有限公司 | The connecting rod of adjustable in length |
| US10669930B2 (en) | 2015-08-10 | 2020-06-02 | Avl List Gmbh | Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve |
| US10738690B2 (en) | 2016-07-06 | 2020-08-11 | Avl List Gmbh | Connecting rod having an adjustable connecting rod length with a mechanical actuating means |
| US10876474B2 (en) | 2016-05-31 | 2020-12-29 | Avl List Gmbh | Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine |
| US10954849B2 (en) | 2015-12-14 | 2021-03-23 | Avl List Gmbh | Length-adjustable connecting rod with electromagnetically-actuatable switching valve |
| US11066987B2 (en) | 2017-02-24 | 2021-07-20 | Avl List Gmbh | Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015105922A1 (en) * | 2015-04-17 | 2016-10-20 | Marco Systemanalyse Und Entwicklung Gmbh | valve assembly |
| PL425074A1 (en) * | 2015-06-15 | 2018-11-19 | Joy Mm Delaware, Inc. | Systems and methods for monitoring stability of the mine's longwall roof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1205698A (en) * | 1968-11-08 | 1970-09-16 | Parker Hannifin Corp | Pressure regulating valves |
| SU812982A1 (en) * | 1978-10-12 | 1981-03-15 | Дружковский Ордена Ленина Машиностроительныйзавод Имени 50-Летия Советскойукраины | Apparatus for remote control of hydraulically driven roof support section |
| DE3402584C2 (en) * | 1984-01-26 | 1986-06-12 | Bochumer Eisenhütte Heintzmann GmbH & Co KG, 4630 Bochum | Hydraulic synchronization control |
| DE3931625C1 (en) * | 1989-09-22 | 1990-08-09 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal, De | Underground mine roof support - maintains constant residual pressure during advance |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2700829C2 (en) * | 1977-01-11 | 1986-04-17 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Hydraulic extension control |
| SU693028A1 (en) * | 1977-02-15 | 1979-10-25 | Oshchepkov Pavel D | Power mine roof support for mining coal and filling-up excavated space |
| DE2803706A1 (en) * | 1978-01-28 | 1979-08-02 | Hebben Rolf Dipl Volksw | Throttle for hydraulic mine roof support - has safety valve in form of movable plunger within piston set by variable spring |
| DE2808205C2 (en) * | 1978-02-25 | 1985-10-10 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Hydraulic control for a gap cover arranged on the cap or on the breakage shield of a walking support |
| DE2832875C2 (en) * | 1978-07-27 | 1985-11-07 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Hydraulic control for a gap covering and alignment device arranged on one side on the cap or on the fracture shield of an extension member |
| DE3024116C2 (en) * | 1980-06-27 | 1985-02-14 | Thyssen Industrie Ag, 4300 Essen | Control device for walking support in underground mining |
| DE3316736A1 (en) * | 1983-05-07 | 1984-11-08 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | SHUT-OFF VALVE DEVICE FOR HYDRAULIC HIGH PRESSURE SYSTEMS, IN PARTICULAR HYDRAULIC REMOVAL SYSTEMS IN MINING OPERATIONS |
| DE3504553C1 (en) * | 1985-02-11 | 1986-04-10 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal | Pressure switching valve as a pressure relief valve for hydraulic step extension |
| RU2078939C1 (en) * | 1995-05-12 | 1997-05-10 | Акционерное общество открытого типа "Подмосковный научно-исследовательский и проектно-конструкторский угольный институт" | Device for transverse displacement and holding of base of powered support unit |
| RU2136888C1 (en) * | 1998-02-10 | 1999-09-10 | АО "Подмосковный научно-исследовательский и проектно-конструкторский угольный институт" | Powered support for mining seams by chambers |
-
2010
- 2010-07-13 DE DE102010026977.8A patent/DE102010026977B4/en not_active Expired - Fee Related
-
2011
- 2011-06-30 CN CN201110182572.2A patent/CN102330561B/en not_active Expired - Fee Related
- 2011-07-12 UA UAA201108794A patent/UA101865C2/en unknown
- 2011-07-12 UA UAA201213924A patent/UA106290C2/en unknown
- 2011-07-12 RU RU2011128978/03A patent/RU2477797C1/en active
- 2011-07-13 PL PL395638A patent/PL213628B1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1205698A (en) * | 1968-11-08 | 1970-09-16 | Parker Hannifin Corp | Pressure regulating valves |
| SU812982A1 (en) * | 1978-10-12 | 1981-03-15 | Дружковский Ордена Ленина Машиностроительныйзавод Имени 50-Летия Советскойукраины | Apparatus for remote control of hydraulically driven roof support section |
| DE3402584C2 (en) * | 1984-01-26 | 1986-06-12 | Bochumer Eisenhütte Heintzmann GmbH & Co KG, 4630 Bochum | Hydraulic synchronization control |
| DE3931625C1 (en) * | 1989-09-22 | 1990-08-09 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal, De | Underground mine roof support - maintains constant residual pressure during advance |
Non-Patent Citations (1)
| Title |
|---|
| 鲁晓杰等: "综放面自上而下回收支架与锚固站拆架新技术", 《中州煤炭》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108026834A (en) * | 2015-06-18 | 2018-05-11 | Avl 里斯脱有限公司 | The connecting rod of adjustable in length |
| US10570818B2 (en) | 2015-06-18 | 2020-02-25 | Avl List Gmbh | Longitudinally adjustable connecting rod |
| CN108026834B (en) * | 2015-06-18 | 2020-07-24 | Avl 里斯脱有限公司 | Length-adjustable connecting rod |
| US10669930B2 (en) | 2015-08-10 | 2020-06-02 | Avl List Gmbh | Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve |
| US10954849B2 (en) | 2015-12-14 | 2021-03-23 | Avl List Gmbh | Length-adjustable connecting rod with electromagnetically-actuatable switching valve |
| US10876474B2 (en) | 2016-05-31 | 2020-12-29 | Avl List Gmbh | Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine |
| US11199130B2 (en) | 2016-05-31 | 2021-12-14 | Avl List Gmbh | Length-adjustable piston rod with a control device that can be hydraulically actuated and a switching valve that can be electromagnetically actuated, a reciprocating piston engine and a vehicle |
| US10738690B2 (en) | 2016-07-06 | 2020-08-11 | Avl List Gmbh | Connecting rod having an adjustable connecting rod length with a mechanical actuating means |
| US11066987B2 (en) | 2017-02-24 | 2021-07-20 | Avl List Gmbh | Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102330561B (en) | 2014-03-12 |
| PL395638A1 (en) | 2012-01-16 |
| RU2011128978A (en) | 2013-01-20 |
| UA106290C2 (en) | 2014-08-11 |
| DE102010026977B4 (en) | 2016-06-02 |
| UA101865C2 (en) | 2013-05-13 |
| RU2477797C1 (en) | 2013-03-20 |
| DE102010026977A1 (en) | 2012-01-19 |
| PL213628B1 (en) | 2013-04-30 |
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