AU2021282457B2 - Apparatus and method for adjusting length of canopy of hydraulic roof support for top coal caving, and hydraulic roof support - Google Patents
Apparatus and method for adjusting length of canopy of hydraulic roof support for top coal caving, and hydraulic roof support Download PDFInfo
- Publication number
- AU2021282457B2 AU2021282457B2 AU2021282457A AU2021282457A AU2021282457B2 AU 2021282457 B2 AU2021282457 B2 AU 2021282457B2 AU 2021282457 A AU2021282457 A AU 2021282457A AU 2021282457 A AU2021282457 A AU 2021282457A AU 2021282457 B2 AU2021282457 B2 AU 2021282457B2
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- canopy
- coal caving
- roof support
- hydraulic roof
- extension
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Classifications
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- 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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
- E21D23/063—Retractable cantilever extensions therefor
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
An apparatus and method for adjusting a length of a canopy of a hydraulic roof support
for top coal caving, and a hydraulic roof support for top coal caving are disclosed. The
apparatus includes a driving member, a canopy extension and a controller. The driving
member drives the canopy extension to extend or retract under control of the controller, to
adjust the length of the canopy; and the controller obtains a current coal caving quantity on
the hydraulic roof support, and controls an action of the driving member based on the coal
caving quantity to allow the canopy extension to extend or retract.
0 30
1 40
500
FIG. 2
Description
0 30 1 40
500
FIG. 2
FIELD The present disclosure relates to the field of coal mining technology and, more
particularly, to an apparatus and method for adjusting a length of a canopy of a hydraulic roof
support for top coal caving, and a hydraulic roof support for top coal caving.
o BACKGROUND In the related art, hydraulic roof supports are difficult to perform normal coal caving, since position of external force acting on canopy is not easy to control, causing unreasonable
force states, and phenomena such as "excessive coal caving," "insufficient coal caving" or "pulling rear pillars" and other abnormal working conditions may occur from time to time.
SUMMARY The present disclosure aims to solve at least one of the problems existing in the related art.
Accordingly, a first objective of the present disclosure is to propose an apparatus for
.0 adjusting a length of a canopy of a hydraulic roof support for top coal caving, to address the problems such as "excessive coal caving," "insufficient coal caving" "pulling rear pillars" and
other abnormal working conditions, and realize intelligent coupling between the coal caving
state of the hydraulic roof support and the force control. A second objective of the present disclosure is to propose a hydraulic roof support for top coal caving.
A third objective of the present disclosure is to propose a method for adjusting a length of a canopy of a hydraulic roof support for top coal caving.
To achieve the above objective, embodiments of a first aspect of the present disclosure
provide an apparatus for adjusting a length of the canopy of a hydraulic roof support for top coal caving. The apparatus is arranged at a tail end of the canopy of the hydraulic roof support
and includes a driving member, a canopy extension and a controller. The driving member drives the canopy extension to extend or retract under control of the controller, to adjust the length of the canopy. The controller obtains a current coal caving quantity on the hydraulic roof support, and controls an action of the driving member based on the coal caving quantity to allow the canopy extension to extend or retract. According to an embodiment of the present disclosure, the apparatus further includes a guide rail arranged at the tail end of canopy of the hydraulic roof support; and the canopy extension is driven by the driving member to extend or retract along the guide rail. According to an embodiment of the present disclosure, the canopy extension has a fully closed surface. According to an embodiment of the present disclosure, a receiving groove for the canopy extension is arranged at the tail end of canopy of the hydraulic roof support; and the canopy extension extends from the receiving groove under the drive of the driving member and retracts into the receiving groove under the drive of the driving member. According to an embodiment of the present disclosure, the receiving groove has a groove depth consistent with a stroke of the driving member. According to an embodiment of the present disclosure, the controller drives the canopy extension to extend to lengthen the canopy when the coal caving quantity is greater than or equal to a first threshold value, and drives the canopy extension to retract to restore the canopy to an original length of the canopy when the coal caving quantity is less than or equal .o to a second threshold value, during a coal caving process. According to an embodiment of the present disclosure, the apparatus further includes a coal caving quantity detection assembly connected to the controller and detecting the current coal caving quantity on the canopy. To achieve the above objective, embodiments of a second aspect of the present disclosure provide a hydraulic roof support for top coal caving. The hydraulic roof support includes a canopy; a base; a leg having a first end connected to the canopy and a second end connected to the base, the leg supporting the canopy; and the apparatus according to the embodiments of the second aspect of the present disclosure. According to an embodiment of the present disclosure, the hydraulic roof support further includes: a caving shield. The caving shield and the canopy define a coal caving window, and a size of the coal caving window is variable by adjusting the length of the canopy.
To achieve the above objective, embodiments of a third aspect of the present disclosure provide a method for adjusting a length of a canopy of a hydraulic roof support for top coal caving. The method is adapted to the above apparatus and includes: obtaining the current coal caving quantity on the hydraulic roof support; and driving the canopy extension to extend or retract according to the obtained coal caving quantity, to adjust the length of the canopy. In the present disclosure, the length of the canopy is not constant, but is determined according to the coal caving quantity. Thus, problems, such as difficult control over positions of external force acting on the canopy, caused by the fact that the canopy cannot extend or retract based on the coal caving quantity, can be solved, to ensure normal coal caving of the hydraulic roof support and reasonable force state, avoiding the occurrence of "excessive coal caving," "insufficient coal caving," "pulling of the rear pillar," and other abnormal working conditions, and achieving intelligent coupling between the coal caving state of the hydraulic roof support and the force control. Additional aspects and advantages of embodiments of the present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram illustrating a working process of a hydraulic roof support .0 for top coal caving. FIG. 2 is a structural diagram of a hydraulic roof support for top coal caving according to an embodiment of the present disclosure. FIG. 3 is a structural diagram of an apparatus for adjusting a length of a canopy of a hydraulic roof support for top coal caving. FIG. 4 is a schematic diagram illustrating a working state of a hydraulic roof support for top coal caving. FIG. 5 is a schematic diagram illustrating a working state of a hydraulic roof support for top coal caving. FIG. 6 is a schematic diagram illustrating a working state of a hydraulic roof support for top coal caving.
FIG. 7 is a structural diagram of a hydraulic roof support for top coal caving according to
another embodiment of the present disclosure.
FIGS. 8(a)-8(b) are partial schematic diagrams of an apparatus for adjusting a length of a
canopy of a hydraulic roof support for top coal caving.
DETAILED DESCRIPTION OF EMBODIMENTS Embodiments of the present disclosure will be described in detail below, and examples
of the embodiments will be shown in the accompanying drawings. The same or similar
elements and the elements having same or similar functions are denoted by like reference
numerals throughout the descriptions. The embodiments described below are exemplary and
are intended to explain the present disclosure rather than limit the present disclosure.
An apparatus and method for adjusting a length of a canopy of a hydraulic roof support
for top coal caving, and a hydraulic roof support for top coal caving will be described below
in conjunction with the drawings.
During top coal caving mining, too much falling coal exerts large pressure on a front side
of the canopy of the hydraulic roof support, which makes a center of gravity of the canopy
drift toward the front side of the hydraulic roof support, for example, drifting a position
represented by a black dot to another position indicated by an arrow in FIG. 1. Consequently,
a rear side of the canopy of the hydraulic roof support is raised upwards, i.e., a phenomenon
.0 of pulling a rear pillar. Moreover, during top coal caving mining, coal falls at an inconstant
speed, and phenomena such as "excessive coal caving" and "insufficient coal caving" often
occur when a coal caving window at the canopy is fixed.
In order to solve the above problems during top coal caving mining, the present
disclosure proposes an apparatus 10 for adjusting a length of a canopy 20 of a hydraulic roof
support 1. The apparatus can adjust the length of the canopy and thus change a size of the coal
caving window, avoiding phenomena such as "excessive coal caving," "insufficient coal
caving" and "pulling of the rear pillar."
FIG. 2 is a structural diagram of a hydraulic roof support for top coal caving according to
an embodiment of the present disclosure. As shown in FIG. 2, the apparatus 10 is arranged at
a tail end of the canopy 20 of the hydraulic roof support 1. FIG. 3 is a partially enlarged view of the apparatus 10. As shown in FIG. 3, the apparatus 10 includes: a driving member 11, a canopy extension 12, and a controller 13 (not shown in FIG. 3). The driving member 11 is used to drive the canopy extension 12 to extend or retract under control of the controller 13, to adjust the length of the canopy 20. The controller 13 is used to obtain a current coal caving quantity on the hydraulic roof support, and controls an action of the driving member 11 based on the coal caving quantity to allow the canopy extension 12 to extend or retract.
In some embodiments of the present disclosure, the driving member 11 is connected to
the canopy extension 12 and the controller 13. In some embodiments, the driving member 11
maybe a jack.
The driving member 11, under the control of the controller 13, can drive the canopy
extension 12, and the canopy extension 12 can extend from the tail end of the canopy 20 when
subjected to an outward driving force applied by the driving member 11, as shown in FIG. 2.
The canopy extension 12 is equivalent to supplementing the length of the canopy 20, and
makes the canopy longer. The canopy extension 12 can be retracted to the tail end of the
canopy 20 when subjected to an inward driving force applied by the driving member 11, in
which case the canopy 20 is restored to its original length. During coal caving, when the coal
caving quantity is large for the hydraulic roof support 1, the canopy 20 can be lengthened in
time by the apparatus 10, and the length change of the canopy 20 makes the center of gravity
not drift, to avoid the phenomenon of pulling the rear pillar.
Further, when the coal caving quantity is large for the hydraulic roof support 1, the
canopy extension 12 extends in time, coal output space above a caving shield 30 is decreased,
and the coal caving window at the canopy is reduced, to control the top coal caving quantity
and achieve intelligent adjustment on a coal caving state. As shown in FIG. 4, when the
canopy 20 becomes longer, the coal output space above the caving shield 30 is decreased, and
the coal caving window between the canopy 20 and the caving shield 30 is reduced, lowering
the coal caving quantity.
The driving member 11, under the control of the controller 13, can drive the canopy
extension 12, and the canopy extension 12 can be retracted to the tail end of the canopy 20
when subjected to the inward driving force applied by the driving member 11, as shown in
FIG. 5.
When the current coal caving quantity on the hydraulic roof support 1 is small, the
canopy extension 12 is retracted in time, the coal output space above the caving shield 30 is
increased, and the coal caving window at the canopy is enlarged, to control the top coal
caving quantity and achieve intelligent adjustment on the coal caving state. As shown in FIG.
6, when the canopy 20 becomes shorter, the coal output space above the caving shield 30 is
increased, and the coal caving window between the canopy 20 and the caving shield 30 is
enlarged, boosting the coal caving quantity.
In some embodiments of the present disclosure, the controller 13 in the apparatus 10 is
further used to drive the canopy extension 12 to extend to lengthen the canopy 20 if the coal
caving quantity is greater than or equal to a first threshold value, and drive the canopy
extension 12 to retract to restore the canopy 20 to its original length if the coal caving
quantity is less than or equal to a second threshold value, during a coal caving process.
In the embodiments, the length of the canopy 20 is not constant, but is determined
according to the coal caving quantity to ensure normal coal caving of the hydraulic roof
support and reasonable force state, avoiding the occurrence of "excessive coal caving,"
"insufficient coal caving," "pulling of the rear pillar," and other abnormal working conditions,
and achieving intelligent coupling between the coal caving state of the hydraulic roof support
and the force control.
In the embodiments, the controller 13 is connected to a coal caving quantity detection
-0 assembly 14, and the coal caving quantity detection assembly 14 can detect the current coal
caving quantity on the canopy 20 of the hydraulic roof support 1 and report the coal caving
quantity detected to the controller 13. Thus, the controller 13 can adjust a retraction or
extension status of the canopy extension 12 according to the coal caving quantity.
It should be noted that the coal caving quantity detection assembly 14 may be a device of
the apparatus 10 or may be a separate device independent of the apparatus 10. In some
embodiments, the coal caving quantity detection assembly 14 may be arranged in a central
area of a lower surface of the canopy 20, and one or more coal caving quantity detection
assemblies 14 may be arranged in the central area. As shown in FIG. 7, the apparatus 10 also
includes a guide rail 15 (not shown in FIG. 7) and a receiving groove 16. The specific
structure of the guide rail 15 can refer to FIG. 8.
As shown in FIG. 8, the guide rail 15 is arranged at the tail end of canopy 20 of the
hydraulic roof support, and the canopy extension 12 is driven by the driving member 11 to
extend or retract along the guide rail 15.
In order to realize the above embodiment, the canopy extension 12 has a fully closed
surface, which improves the stiffness load-bearing performance and of the canopy extension
12, and ensures smooth action of the canopy extension 12. The surface of the canopy
extension 12 adopts a monolithic plate structure, and the groove depth matched with canopy
of the hydraulic roof support is consistent with the length of the canopy extension 12, i.e.,
consistent with a stroke of the driving member 11.
When the canopy extension 12 completely extends, a position of an opening on the
surface of the canopy extension 12 is located inside the canopy 20, and a surface of an
exposed portion of the canopy extension 12 is fully closed to prevent coal leakage.
In some embodiments, the receiving groove 16 for the canopy extension 12 is arranged
at the tail end of the canopy 20 of the hydraulic roof support 1. The canopy extension 12
extends from the receiving groove 16 under the drive of the driving member 11 and retracts
into the receiving groove 16 under the drive of the driving member 11.
In order to realize the above embodiment, the receiving groove 16 has a groove depth
consistent with the stroke of the driving member 11. That is, the groove depth of the receiving
groove 16 is consistent with the length of the canopy extension 12.
Still as shown in FIG. 2, in order to realize the above embodiment, embodiments of the
present disclosure also propose a hydraulic roof support for top coal caving, including: a leg
40, a canopy 20, a base 50, and the apparatus 10 described in the above embodiments. The leg
40 has a first end connected to the canopy 20 and a second end connected to the base 50, and
the leg 40 is used to support the canopy 20. The leg 40 is a hydraulic jack.
In order to realize the above embodiment, embodiments of the present disclosure also
propose a hydraulic roof support 1 for top coal caving, including: a coal caving quantity
detection assembly 14 connected to the controller 13 (not shown in FIG. 2) in the apparatus
10. The coal caving quantity detection assembly 14 is used to detect a current coal caving
quantity on the hydraulic roof support, i.e., the coal caving quantity on the canopy 20. In other
words, in embodiments of the present disclosure, the coal caving quantity detection assembly
14 is a separate detection assembly independent of the apparatus 10 and is not integrated in
the apparatus 10.
In order to realize the above embodiment, embodiments of the present disclosure also
propose a method for adjusting the length of the canopy of the hydraulic roof support for top
coal caving, applicable to the apparatus in any one of the above embodiments. The method
includes: obtaining a current coal caving quantity on the hydraulic roof support 1; and driving
the canopy extension 12 to extend or retract according to the obtained coal caving quantity, to
adjust the length of the canopy 20.
As shown in FIGS. 4 and 6, the apparatus 10 moves and drives an angle with the caving
shield 30 to vary, so as to change the size of the coal caving window and adjust force points at
the same time, which can improve the unstable force state of coal and the roof support, break
coal pieces, ensure normal coal caving of the hydraulic roof support and reasonable force
state, prevent "excessive coal caving," "insufficient coal caving," "pulling of the rear pillar,"
and other abnormal working conditions, and realize the intelligent coupling between the coal
caving state of the hydraulic roof support and the force control.
It should be noted that the above explanation on the apparatus for adjusting the length of
the canopy is also applicable to the method for adjusting the length of the canopy according to
the embodiment and will not be repeated here.
Reference throughout this specification to "an embodiment," "some embodiments," "an
-o example," "a specific example," or "some examples," means that a particular feature,
structure, material, or characteristic described in connection with the embodiment or example
is included in at least one embodiment or example of the present disclosure. The above terms
throughout this specification are not necessarily referring to the same embodiment or example
of the present disclosure. Furthermore, the particular features, structures, materials, or
characteristics may be combined in any suitable manner in one or more embodiments or
examples. Moreover, those skilled in the art can integrate and combine the different
embodiments or examples and the features of the different embodiments or examples
described in this specification without contradicting each other.
Although embodiments of the present disclosure have been shown and described, it can
be appreciated by those skilled in the art that the above embodiments are merely exemplary and are not intended to limit the present disclosure, and various changes, modifications, alternatives and variations may be made in the embodiments within the scope of the present disclosure. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.
It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied. In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, .o or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.
Claims (10)
1. An apparatus for adjusting a length of a canopy of a hydraulic roof support for top
coal caving, the apparatus being arranged at a tail end of the canopy of the hydraulic roof
support and comprising a driving member, a canopy extension and a controller, wherein:
the driving member drives the canopy extension to extend or retract under control of the
controller, to adjust the length of the canopy; and the controller obtains a current coal caving quantity on the hydraulic roof support, and
controls an action of the driving member based on the coal caving quantity to allow the
canopy extension to extend or retract.
2. The apparatus according to claim 1, further comprising:
a guide rail arranged at the tail end of canopy of the hydraulic roof support,
wherein the canopy extension is driven by the driving member to extend or retract along the guide rail.
3. The apparatus according to claim 1, wherein the canopy extension has a fully closed
surface.
4. The apparatus according to any one of claims I to 3, wherein:
a receiving groove for the canopy extension is arranged at the tail end of canopy of the
hydraulic roof support; and the canopy extension extends from the receiving groove under the drive of the driving
member and retracts into the receiving groove under the drive of the driving member.
5. The apparatus according to claim 4, wherein the receiving groove has a groove depth consistent with a stroke of the driving member.
6. The apparatus according to any one of claims I to 3, wherein: the controller drives the canopy extension to extend to lengthen the canopy when the
coal caving quantity is greater than or equal to a first threshold value, and drives the canopy
extension to retract to restore the canopy to an original length when the coal caving quantity is
less than or equal to a second threshold value, during a coal caving process.
7. The apparatus according to claim 6, further comprising:
a coal caving quantity detection assembly connected to the controller and detecting the current coal caving quantity on the canopy.
8. A hydraulic roof support for top coal caving, comprising:
a canopy;
a base;
a leg having a first end connected to the canopy and a second end connected to the base,
the leg supporting the canopy; and
the apparatus according to any one of claims 1 to 7.
9. The hydraulic roof support according to claim 8, further comprising a caving shield,
wherein the caving shield and the canopy define a coal caving window, and a size of the
coal caving window is variable by adjusting the length of the canopy roof support.
10. A method for adjusting a length of a canopy of a hydraulic roof support for top coal
caving, adapted to the apparatus according to any one of claims 1 to 7, the method
comprising:
obtaining the current coal caving quantity on the hydraulic roof support; and
driving the canopy extension to extend or retract according to the obtained coal caving
quantity, to adjust the length of the canopy.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011444319.5 | 2020-12-08 | ||
| CN202011444319.5A CN112593989B (en) | 2020-12-08 | 2020-12-08 | Top beam length adjusting device and method of hydraulic support for caving coal and hydraulic support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2021282457A1 AU2021282457A1 (en) | 2022-06-23 |
| AU2021282457B2 true AU2021282457B2 (en) | 2023-02-16 |
Family
ID=75192431
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021282457A Active AU2021282457B2 (en) | 2020-12-08 | 2021-12-08 | Apparatus and method for adjusting length of canopy of hydraulic roof support for top coal caving, and hydraulic roof support |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112593989B (en) |
| AU (1) | AU2021282457B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378390B (en) * | 2021-01-12 | 2021-05-25 | 北京龙软科技股份有限公司 | Fully-mechanized coal mining face measuring robot device and automatic measuring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4065929A (en) * | 1976-03-08 | 1978-01-03 | Atlantic Richfield Company | Mine roof support and method in longwall mining of thick mineral seams |
| AU2005242116A1 (en) * | 2004-12-10 | 2006-06-29 | Yanzhou Coal Mining Company Limited | Electro-hydraulically controlled roof coal caving method and hydraulic support therefor |
| CN102720499A (en) * | 2012-06-29 | 2012-10-10 | 中国矿业大学 | Fully-mechanized top-coal caving, filling and mining method |
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|---|---|---|---|---|
| CS229507B1 (en) * | 1981-04-09 | 1984-06-18 | Tadeas Ing Wala | Support unit for coal or industrial minerals seam mining in benches and/or by roof enlarging |
| CN2078373U (en) * | 1990-01-08 | 1991-06-05 | 中国矿业大学北京研究生部 | Telescopic type coal pit prop with relaxing and proping-up sliding top-beam |
| DE4016929C1 (en) * | 1990-05-25 | 1991-09-26 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co., 5600 Wuppertal, De | Roof support for mine - has canopy with bar hinged to floor skids by extendable props |
| DE19814246A1 (en) * | 1998-03-31 | 1999-10-07 | Saartech Ges Fuer Ind Und Berg | Coal face shield structure with a take-off opening |
| CN1279340A (en) * | 1999-06-30 | 2001-01-10 | 萨尔技术股份有限公司 | Shield supports for having influence on edge of roof caving |
| SK285710B6 (en) * | 2003-09-05 | 2007-06-07 | Hornonitrianske Bane Prievidza, A. S. | Mine roof mechanised support for extract coal from the roof |
| CN102900450A (en) * | 2012-09-05 | 2013-01-30 | 山东科技大学 | Caving coal hydraulic support with large swing beam structure |
| CN203008938U (en) * | 2012-11-14 | 2013-06-19 | 三一重型装备有限公司 | Tail beam structure of top coal caving hydraulic bracket and top coal caving hydraulic bracket |
| CN105134274B (en) * | 2015-09-29 | 2017-09-22 | 天地科技股份有限公司 | The two post hydraulic support for large-mining height caving coal with three-level top coal recycling device |
| CN209942861U (en) * | 2019-04-23 | 2020-01-14 | 云南省后所煤矿 | Sliding block type hydraulic support |
-
2020
- 2020-12-08 CN CN202011444319.5A patent/CN112593989B/en active Active
-
2021
- 2021-12-08 AU AU2021282457A patent/AU2021282457B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4065929A (en) * | 1976-03-08 | 1978-01-03 | Atlantic Richfield Company | Mine roof support and method in longwall mining of thick mineral seams |
| AU2005242116A1 (en) * | 2004-12-10 | 2006-06-29 | Yanzhou Coal Mining Company Limited | Electro-hydraulically controlled roof coal caving method and hydraulic support therefor |
| CN102720499A (en) * | 2012-06-29 | 2012-10-10 | 中国矿业大学 | Fully-mechanized top-coal caving, filling and mining method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112593989A (en) | 2021-04-02 |
| AU2021282457A1 (en) | 2022-06-23 |
| CN112593989B (en) | 2022-11-25 |
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