CN112177654A - Mining face end and crossheading advance self-moving supporting method - Google Patents
Mining face end and crossheading advance self-moving supporting method Download PDFInfo
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- CN112177654A CN112177654A CN202011057637.6A CN202011057637A CN112177654A CN 112177654 A CN112177654 A CN 112177654A CN 202011057637 A CN202011057637 A CN 202011057637A CN 112177654 A CN112177654 A CN 112177654A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005065 mining Methods 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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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
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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
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
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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
- E21D23/0409—Aligning or guiding means for the supports or for the constitutive parts of the supports
-
- 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
- E21D23/0472—Supports specially adapted for people walking or transporting material
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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
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
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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)
- Bridges Or Land Bridges (AREA)
- Emergency Lowering Means (AREA)
Abstract
A supporting method for the end of mining face and its crossheading by advancing the self-moving of them features that the advancing supporter is composed of top beam, lifting seat, base, vertical columns, advancing jack and correcting jack, and the top beam is an integral box structure. According to the support method, the top beam of the integral box-type structure is adopted to support the top plate, the support safety is improved, two adjacent support supports can move transversely by means of mutual force, the support supports move forwards along with the working face and move forwards from back to front, the support length is shortened along with the advancing of the working face, the production shift shrinkage support and the maintenance shift stretching support are realized, and the retractable length of the support group is determined according to the daily advancing degree of the working face.
Description
Technical Field
The invention relates to the technical field of coal mine stoping, in particular to a mining face end and gate advance self-moving supporting method.
Background
The hydraulic support is a structure used for controlling mine pressure of a coal face, a two-lane advanced pressure area of the coal face of a coal mine needs to be reinforced and supported, a single hydraulic support is mainly erected manually and matched with a steel beam to carry out 'one beam two columns' shed lifting support, the shed lifting support row spacing is generally 800mm, the support range is 20m along the lane, as the work face is propelled, the tail end shed lifting beam needs to be removed manually and moved to the foremost end to be erected again, the labor intensity of workers is high, and the operation environment is poor.
CN210460722U discloses a coal mine tunnel removes and struts support, it adopts A, B frame type combination to form a whole alternate movement, and the frame type is complicated, prevents down the nature poor, and in addition form line contact with the roof, exists and strut neutral gear, security leak.
CN103061792B discloses a car type hydraulic support for coal mine, which is to improve the destructive repeated support of roof, and the top of the support is set to be supported by a horizontal jack between two roof beams, and is strengthened stably by an inner telescopic beam, so that the size of the movable rear support is reduced, and the movable rear support is retracted, and the movable rear support can be moved through the inner space of the front support, but the support is still complex in shape, and is not in contact with the roof, and the problems of supporting neutral gear and safety leak exist.
Disclosure of Invention
The invention aims to provide a face end and crossheading advance self-moving support method, which adopts a top beam with an integral box-type structure to support a top plate, improves the support safety, enables two adjacent support supports to move transversely by means of mutual force, moves forwards along with a working face, moves from back to front, and shortens the support length along with the advance of the working face, so that a production shift shrinking frame and a maintenance shift stretching frame are realized, and the stretching length of a support group is determined according to the daily advancing degree of the working face.
The embodiment of the invention is realized by the following technical scheme:
a face end and crossheading advance self-moving support method adopts an advance support, the advance support comprises a top beam, a lifting seat, a base, stand columns, a pushing jack and a deviation correcting jack, the top beam adopts an integral box structure, the stand columns comprise four double telescopic stand columns which are respectively arranged at four corners of the base, two ends of the lifting seat are respectively connected with the top beam and the base, the deviation correcting jack comprises a plurality of bases which are respectively arranged at four corners of the base and used for assisting the movement of a frame and correcting deviation, two ends of the pushing jack are respectively connected with the bases of two adjacent advance supports, the supporting method comprises the steps that a plurality of fore supports and end supports are connected in series through pushing jacks to form a group of supports which are arranged in the end of a working surface and in an advance crossheading in a row, the pushing jacks among the supports keep an extending state before the working surface is stoped and pushed forward, and the group of supports move corresponding frames from back to front along with the pushing of one time from the working surface.
Furthermore, the length of the advance support is L meters, the end supports are M meters, the width of the support is A meters, the stroke of the pushing jack is B meters, the minimum distance between the supports is C meters, the maximum distance between the supports is B + C meters, and the stroke of the pushing jack is B meters, which is consistent with the coal cutting cycle depth of the working face;
the working face adopts a three-eight system two-sampling one-standard operation mode, shift advance supports are prepared, the number of the advance supports arranged along a groove is not less than n, before stoping of the working face, shift jacks among the supports in a group of supports are in an extending state, and the length of the advance support is L ═ n (A + B + C); after the working face cuts coal n times daily, the length of the fore support is I-L-n-B-n (A + C), wherein I is not less than 20 m.
Further, the base adopts the integral structure of ship type.
Further, the top beam is arranged to extend beyond the base to form a cantilever shield structure.
Furthermore, two groups of pushing jacks are arranged between two adjacent forepoling brackets.
Furthermore, the lifting seat comprises a seat body, a first-stage lifting rod and a second-stage lifting rod, the seat body is formed by welding steel plates to form a hollow cylinder, and the first-stage lifting rod and the second-stage lifting rod are sleeved on the inner side of the seat body to meet the requirement of large expansion ratio of the double-expansion upright.
Furthermore, a telescopic safe pedestrian mechanism is arranged between two adjacent forepoling brackets.
Further, safe pedestrian mechanism includes that two steel sheet overlap joints form, and one side of two steel sheets is bolted fixation in adjacent base edge respectively, and the mutual overlap joint of opposite side of two steel sheets forms the gap bridge or overlaps.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects: the top beam of the integral box-type structure is adopted to support the top plate, so that the supporting safety is improved; two adjacent support brackets can move transversely by mutual force, move forwards along with the working face and move forwards from back to front, the support length is shortened along with the advancing of the working face, the production class shrinkage frame and the maintenance class stretching frame are realized, and the retractable length of the bracket group is determined according to the daily advancing degree of the working face.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 provides a front view of a lead frame according to an embodiment of the present invention;
FIG. 2 is a side view of a lead frame according to an embodiment of the invention;
FIG. 3 is a top view of a lead frame according to an embodiment of the present invention.
Icon: 100-top beam, 110-cantilever shield structure, 200-lifting seat, 300-base, 400-upright column, 500-pushing jack, 600-deviation-rectifying jack and 700-safe pedestrian mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the orientations or positional relationships are only used for convenience of describing the present invention and simplifying the description, and the terms do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, the present embodiment provides a face end and gate advance self-moving support method, which comprises a group of supports, wherein the group of supports is formed by a series of advance supports and end supports connected in series, wherein the adjacent support members are connected by a pushing jack 500. Before the working face is stoped and pushed, the inter-frame pushing jack 500 keeps in an extending state, and the grouped supports move forward by corresponding frames from back to front along with the pushing of each time one cutting is pushed forward from the working face.
Specifically, each time the working face is pushed forward, the grouped supports move forward one from back; pushing the second knife to move the two frames; pushing the third knife moves three frames, and so on. In the method, n coal cutting knives are preset, and the number of the advance supports arranged along the super is not less than n supports.
In the method for supporting the end of the mining face and the crossheading in advance, the length of the advance support is L meters, the end supports are M meters, the width of a support is A meters, the distance of a pushing jack is 500M, the distance of the minimum frame is C meters, the distance of the maximum frame is B + C meters, the distance of the pushing jack is 500M, the distance of the pushing jack is consistent with the coal cutting cycle depth of the working face, and the distance is generally set to 0.8M; preparing shift advancing supports by adopting a three-eight system two-sampling one-standard operation mode on a working face, arranging the advancing supports in a crossheading manner, wherein the number of the advancing supports is not less than n, and before stoping on the working face, advancing jacks 500 among supports in a group of supports are in an extending state, wherein the length of the advancing supports is L ═ n (A + B + C); after the working face cuts coal n times daily, the length of the fore support is I-L-n-B-n (A + C), wherein I is not less than 20 m.
In the advance self-moving supporting method for the mining face end and the crossheading, the advance support in the group of supports, please refer to fig. 1 to 3, is provided with a top beam 100, a lifting seat 200, a base 300, a column 400, a pushing jack 500 and a deviation correcting jack 600. The top beam 100 adopts an integral box-type structure, and the roadway roof is subjected to surface support through the integral box-type structure, so that the support safety is improved. The upright columns 400 comprise four double telescopic upright columns 400 which are respectively arranged at four corners of the base 300, two ends of the lifting seat 200 are respectively connected with the top beam 100 and the base 300, one end of each upright column 400 is connected with the base 300, and the other end of each upright column 400 is connected with the top beam 100. Wherein, the double telescopic columns 400 in the columns 400 are hinged with the top beam 100, and the top beam 100 can be adjusted to a certain inclination angle in a supporting state to adapt to different on-site roof conditions. The deviation rectifying jack 600 includes a plurality of bases 300 respectively disposed at four corners of the base 300 for assisting the moving frame to rectify deviation, and two ends of the pushing jack 500 are respectively connected to two adjacent leading brackets.
Wherein, the upper side of back timber sets up the horizontal distribution preferred.
Referring to fig. 2, in the design that the top beam 100 is an integral box-type structure, the top beam 100 extends out of the base 300 to form a cantilever shield structure 110, a space below the shield is used as a coal transportation channel, and the upright column 400 and the lifting seat 200 are arranged deviating from the space below the cantilever shield structure 110.
The frame moving process of the fore support comprises a deviation rectifying working condition, the deviation rectifying jack 600 on one side of the base 300 can be extended, and the fore support can be supported by means of lane walls or other objects to rectify the deviation towards the other side, so that the fore support can move according to a preset route.
Wherein, two groups of pushing jacks 500 are arranged between two adjacent forepoling. The two sets of pushing jacks 500 realize the mutual pushing process between two adjacent supports, and can also control the action to turn or not.
Further, the base 300 is of a ship-shaped integral structure, the integral base 300 is high in strength, large in grounding area and small in specific pressure to the bottom plate.
Further, the lifting seat 200 is composed of a seat body, a first-stage lifting rod and a second-stage lifting rod, the seat body is welded by steel plates to form a hollow cylinder, the first-stage lifting rod and the second-stage lifting rod are all sleeved on the inner side of the seat body to meet the requirement of large expansion ratio of the double-expansion upright column 400, and the effect that the top beam 100100 is stably connected with the base 300300 is achieved.
Further, a telescopic safe pedestrian mechanism 700 is arranged between two adjacent forepoling. This safe pedestrian mechanism 700 includes that two steel sheet overlap joints form, and one side of two steel sheets is bolted fixation in adjacent base 300 edge respectively, and the mutual overlap joint of opposite side of two steel sheets forms the gap bridge or overlaps. When the pushing jack 500 extends out, the two pedestrian linking plates are mutually overlapped to form a gap bridge; when the pushing jack 500 is contracted, the two pedestrian link plates are overlapped.
In the advance self-moving support method of the mining face end and the crossheading, the support moving process involves the following steps:
frame moving working conditions are as follows: the coal face horizontal type advance moving support generally comprises more than two supports, and a front support and a rear support are connected through a pushing jack 500; the front frame is lowered to the upright column 400, the front frame top beam 100 does not bear pressure, the rear frame top beam 100 keeps contacting with the top plate, and the front frame is transversely moved forwards by taking the rear frame as a base point through the outward extending pushing jack 500; the front frame extends the upright column 400, the front frame top beam 100 contacts the top plate, the rear frame descends the upright column 400, the rear frame top beam 100 is separated from the top plate, and the rear frame moves forwards transversely by taking the front frame as a base point through the retraction pushing jack 500;
and (3) support working conditions: the top beam 100 is of a box-type integral shield structure, one side of the top beam 100 is connected with the base 300 through four upright posts 400 and a lifting seat 200 to form a support body, and the top beam 100 can support a top plate in full section surface contact; pedestrian safety distances are reserved among the four upright posts 400, and the front frame and the rear frame support are connected with a pedestrian passage through a pedestrian device; the other side of the top beam 100 is provided with a cantilever shield structure 110, and the lower part of the shield is used as a coal transportation channel;
deviation rectifying working conditions: in the process of moving the horizontal type forepoling, the forepoling can be moved to the other side by stretching the correcting jack 600 at one side of the base 300 and supporting the forepoling by means of a roadway side or other objects, so that the forepoling can be corrected to the other side, and the effect of moving the forepoling according to a preset route is achieved.
In summary, the mining face end and the crossheading advance self-moving supporting method provided by the embodiment at least have the following beneficial effects and advantages:
(1) the top beam 100 with an integral box-type structure is adopted to carry out surface support on the top plate, so that the support safety is improved;
(2) two adjacent support brackets can move transversely by mutual force, move forwards along with the working face and move from back to front one by one, the support length is shortened along with the advancing of the working face, the production class shrinkage frame and the maintenance class stretching frame are realized, and the extensible length of the bracket group is determined according to the daily advancing degree of the working face;
(3) the top beam 100 of the integrated box-type structure is provided with an overhanging cantilever shield structure 110, and the space below the shield is used as a coal transportation channel;
(4) the rack moving has the functions of correcting deviation and steering;
(5) the telescopic pedestrian safety mechanism 700 is arranged, a pedestrian passage is enclosed between the lower part of the top beam 100 and the four upright posts 400, and the pedestrian passage is provided by matching with a gap bridge or an overlapped steel plate of the pedestrian safety mechanism 700.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A mining face end and crossheading advance self-moving supporting method is characterized in that:
adopting an advance support, wherein the advance support comprises a top beam, a lifting seat, a base, stand columns, a pushing jack and a deviation rectifying jack, the top beam adopts an integral box type structure, the stand columns comprise four double telescopic stand columns which are respectively arranged at four corners of the base, two ends of the lifting seat are respectively connected with the top beam and the base, the deviation rectifying jack comprises a plurality of supporting rods which are respectively arranged at four corners of the base and used for assisting in moving the support and rectifying deviation, and two ends of the pushing jack are respectively connected with the bases of two adjacent advance supports;
the advancing support and the end support are connected in series through the advancing jack to form a group of supports arranged in the working face end and the advancing crossheading in a row, before the working face is stoped and pushed, the advancing jack keeps an extending state between the supports, and the group of supports move corresponding supports forwards from back to front along with pushing of a knife from the working face.
2. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: the length of an advance support is L meters, the length of an end support is M meters, the width of a support is A meters, the stroke of a pushing jack is B meters, the minimum distance between frames is C meters, the maximum distance between frames is B + C meters, and the stroke of the pushing jack is B meters, and the coal cutting cycle depth of a working face is consistent with that of the pushing jack;
the working face adopts a three-eight system two-sampling one-standard operation mode, the advance supports are pushed in preparation for shifts, the number of the advance supports arranged along the groove is not less than n, before stoping of the working face, the pushing jacks among the supports in the group of supports are in an extending state, and the length of the advance support is L-n (A + B + C); after the working face cuts coal n times daily, the length of the fore support is I-L-n-B-n (A + C), wherein I is not less than 20 m.
3. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: the base adopts the integral structure of ship type.
4. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: the top beam extends out of the range of the base to form a cantilever shield structure.
5. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: two groups of pushing jacks are arranged between two adjacent forepoling brackets.
6. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: the lifting seat is composed of a seat body, a first-stage lifting rod and a second-stage lifting rod, the seat body is formed by welding steel plates to form a hollow cylinder, and the first-stage lifting rod and the second-stage lifting rod are all sleeved on the inner side of the seat body to meet the requirement of large expansion ratio of the double-expansion upright.
7. The mining face end and gate advance self-moving support method according to claim 1, characterized in that: and a telescopic safe pedestrian mechanism is arranged between the two adjacent forepoling brackets.
8. The mining face end and gate advance self-moving support method according to claim 7, characterized in that: the safe pedestrian mechanism comprises two steel plates which are overlapped, wherein one sides of the two steel plates are respectively fixed on the edges of the adjacent bases through bolts, and the other sides of the two steel plates are overlapped to form a gap bridge or an overlap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011057637.6A CN112177654B (en) | 2020-09-30 | 2020-09-30 | Mining face end head and crossheading advanced self-moving supporting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011057637.6A CN112177654B (en) | 2020-09-30 | 2020-09-30 | Mining face end head and crossheading advanced self-moving supporting method |
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| CN112177654A true CN112177654A (en) | 2021-01-05 |
| CN112177654B CN112177654B (en) | 2023-09-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2410125A1 (en) * | 1977-11-25 | 1979-06-22 | Gewerk Eisenhuette Westfalia | Mine support behind face conveyor - has screen behind conveyor formed by horizontal tubes with suspension chains |
| CN2700562Y (en) * | 2004-04-30 | 2005-05-18 | 兖矿集团有限公司 | Hydraulic support for forepoling of fully mechanized mining workface gate |
| CN101338684A (en) * | 2008-08-20 | 2009-01-07 | 天地科技股份有限公司 | Combined guided slipping type forepoling hydraulic support |
| CN205714241U (en) * | 2016-04-15 | 2016-11-23 | 中国神华能源股份有限公司 | A kind of correction thrust gear keeping off cash automatic shifting stand |
| CN108506035A (en) * | 2018-05-07 | 2018-09-07 | 郑州煤矿机械集团股份有限公司 | Big working resistance advanced hydraulic support for air return lane |
| CN109139073A (en) * | 2018-09-04 | 2019-01-04 | 珲春矿业（集团）有限责任公司机电分公司 | A kind of compound lift bottom passage advanced stand device |
-
2020
- 2020-09-30 CN CN202011057637.6A patent/CN112177654B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2410125A1 (en) * | 1977-11-25 | 1979-06-22 | Gewerk Eisenhuette Westfalia | Mine support behind face conveyor - has screen behind conveyor formed by horizontal tubes with suspension chains |
| CN2700562Y (en) * | 2004-04-30 | 2005-05-18 | 兖矿集团有限公司 | Hydraulic support for forepoling of fully mechanized mining workface gate |
| CN101338684A (en) * | 2008-08-20 | 2009-01-07 | 天地科技股份有限公司 | Combined guided slipping type forepoling hydraulic support |
| CN205714241U (en) * | 2016-04-15 | 2016-11-23 | 中国神华能源股份有限公司 | A kind of correction thrust gear keeping off cash automatic shifting stand |
| CN108506035A (en) * | 2018-05-07 | 2018-09-07 | 郑州煤矿机械集团股份有限公司 | Big working resistance advanced hydraulic support for air return lane |
| CN109139073A (en) * | 2018-09-04 | 2019-01-04 | 珲春矿业（集团）有限责任公司机电分公司 | A kind of compound lift bottom passage advanced stand device |
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| Publication number | Publication date |
|---|---|
| CN112177654B (en) | 2023-09-26 |
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