CN112177654B - Mining face end head and crossheading advanced self-moving supporting method - Google Patents
Mining face end head and crossheading advanced self-moving supporting method Download PDFInfo
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- CN112177654B CN112177654B CN202011057637.6A CN202011057637A CN112177654B CN 112177654 B CN112177654 B CN 112177654B CN 202011057637 A CN202011057637 A CN 202011057637A CN 112177654 B CN112177654 B CN 112177654B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005065 mining Methods 0.000 title claims 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 8
- 238000003466 welding 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
- 238000012937 correction Methods 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
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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
-
- 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
-
- 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
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)
- Architecture (AREA)
- Structural Engineering (AREA)
- Emergency Lowering Means (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The advanced self-moving support method for face end and gate way includes advanced support comprising top beam, lifting seat, base, upright post, pushing jack and deviation correcting jack, and the top beam has integral box structure. The supporting method adopts the top beam of the integral box structure to support the top plate surface, so that the supporting safety is improved, two adjacent supporting supports can move transversely by means of force, the supporting supports move forward along with the working surface from back to front, the supporting length is shortened along with the working surface, the production work shrink frame and the maintenance work stretch frame are realized, and the telescopic length of the supporting frame group is determined according to the daily propelling degree of the working surface.
Description
Technical Field
The invention relates to the technical field of coal mine stoping, in particular to a stope end head and a crossheading advanced self-moving support method.
Background
The hydraulic support is a structure for controlling the mine pressure of the coal face, the advanced pressure area of two lanes of the coal face of the coal mine needs to be supported in a reinforcing mode, single hydraulic supports are erected manually to be matched with steel beams to carry out 'one-beam two-column' canopy lifting support, the canopy lifting support row distance is generally 800mm, the support range is 20m along the roadway, along with the pushing of the working face, the canopy lifting beams at the tail end need to be removed manually and moved to the forefront end to be erected again, labor intensity of workers is high, and the working environment is poor.
CN210460722U discloses a movable supporting bracket for a coal mine tunnel, which adopts A, B frames to form a frame for integral alternate movement, has complex frame shape and poor fall prevention, is in line contact with a top plate, and has a supporting neutral gear and a security hole.
CN103061792B discloses a vehicular hydraulic support for coal mine, which is to improve the destructive repeated support of a top plate, and to set the top of the support to be supported by a transverse jack between two top beams and to be reinforced and stabilized by an inner telescopic beam, so that the movable rear support is contracted and reduced in specification, and can move from the inner space of the front support, but still has complex support type, insufficient contact with the top plate, and the problems of supporting neutral gear and security hole exist.
Disclosure of Invention
The invention aims to provide a mining face end and a crossheading advanced self-moving support method, which adopts a top beam with an integral box structure to support a top plate, improves support safety, enables two adjacent support supports to mutually and transversely move by means of force, and is pushed forward along with a working face, and the support length is pushed forward along with the working face from back to front, so that production work shrinkage and maintenance work extension are realized, and the telescopic length of a support group is determined according to the daily pushing degree of the working face.
The embodiment of the invention is realized by the following technical scheme:
the advanced support includes several groups of support and end support connected serially via pushing jacks to the end of the working surface and in the advanced channel, and the pushing jacks between the frames maintain the extending state before the back extraction and pushing of the working surface.
Further, the length of the advance support is L meters, the length of the end support is M meters, the width of the support is A meters, the stroke of the pushing jack is B meters, the distance between the minimum frames is C meters, the distance between the maximum frames is B+C meters, and the stroke of the pushing jack is B meters and the coal cutting circulation cutting depth of the working face are consistent;
the working face adopts a three-eight system two-mining one-standard working mode, a shift advance support is prepared, the number of the advance supports arranged on a gate is not less than n, and before stoping of the working face, the advance jacks among the supports in the group of supports are in an extending state, wherein the length of the advance support is L=n (A+B+C); after the working face daily cuts the coal n-cutter, the length of the advance support is I=L-n×B=n (A+C), wherein I is not less than 20 m.
Further, the base adopts a ship type integral structure.
Further, the top beams extend beyond the base to form a cantilever shelter structure.
Further, two groups of pushing jacks are arranged between two adjacent advance supports.
Further, the lifting seat is composed of a seat body, a primary lifting rod and a secondary lifting rod, the seat body is welded by steel plates to form a hollow cylinder, and the primary lifting rod and the secondary lifting rod are sleeved on the inner side of the seat body to meet the requirement of large expansion ratio of the double expansion stand columns.
Further, a telescopic safety pedestrian mechanism is arranged between two adjacent advanced supports.
Further, the safety pedestrian mechanism comprises two steel plates which are overlapped, one sides of the two steel plates are respectively fixed on the edges of the adjacent bases by bolts, and the other sides of the two steel plates are mutually overlapped to form a gap bridge or overlap.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects: the top beam with an integral box structure is adopted to support the top plate, so that the supporting safety is improved; the two adjacent support supports can move transversely by means of force, and move forwards along with the working face, and the support length is shortened along with the working face, so that the production shift shrinkage and maintenance shift stretching are realized, and the telescopic length of the support group is determined according to the daily propelling degree of the working face.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of an embodiment of the present invention providing a lead frame;
FIG. 2 is a side view of an embodiment of the present invention providing a lead frame;
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 post, 500-pushing jack, 600-rectifying jack and 700-safety pedestrian mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following 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 an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, 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; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 3, the present embodiment provides a method for advanced self-moving support of a mining face end and a gate way, which is provided with a set of brackets, wherein the set of brackets is formed by a series of advanced brackets and end brackets which are arranged in series, and wherein the adjacent bracket members are connected by a pushing jack 500. Before the working face is back-extracted and advanced, the inter-frame pushing jack 500 is kept in an extended state, and the group of brackets are moved back and forth by corresponding frames with each forward advance of one cutter from the working face.
In particular, each time the working surface advances a knife, the unitized brackets move one frame from back to front; pushing the second knife to move the two frames; pushing the third knife to move three frames and so on. In the mode, the number of the pre-arranged n-frames for daily coal cutting is not smaller than n.
In the advanced self-moving support method of the mining face end and the gate way, the advanced support length is L meters, the end support is M meters, the support width is A meters, the pushing jack is 500 travel B meters, the minimum frame spacing is C meters, wherein the maximum frame spacing is B+C meters, the pushing jack 500 travel B meters are consistent with the coal cutting circulation cutting depth of the working face, and the pushing jack is generally set to be 0.8 meters; the working face adopts a three-eight system two-mining one-standard working mode, a shift advance support is prepared, the number of the advance supports arranged in a gate is not less than n, and before stoping of the working face, a shift jack 500 between the supports in the group of supports is in an extending state, wherein the length of the advance support is L=n (A+B+C); after the working face daily cuts the coal n-cutter, the length of the advance support is I=L-n×B=n (A+C), wherein I is not less than 20 m.
In the advanced self-moving support method for the mining face end and the gate way, referring to fig. 1 to 3, the advanced support in the group support 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 structure, and carries out surface support on the roadway top plate through the integral box structure, so that the supporting safety is improved. The upright 400 comprises four double telescopic upright 400 which are respectively arranged at four corners of the base 300, wherein two ends of the lifting seat 200 are respectively connected with the top beam 100 and the base 300, one end of the upright 400 is connected with the base 300, and the other end is connected with the top beam 100. The double telescopic upright posts 400 in the upright posts 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, so that the double telescopic upright posts are suitable for different on-site top plate conditions. The deviation rectifying jack 600 includes a plurality of bases 300 respectively arranged at four corners of the base 300 for assisting in the deviation rectifying of the moving frame, and two ends of the pushing jack 500 are respectively connected with two adjacent advanced brackets.
Wherein, the upper side of the top beam is arranged to be distributed horizontally.
Referring to fig. 2, under the design that the top beam 100 is in an integral box structure, the top beam 100 extends out of the base 300 to form the cantilever shelter structure 110, the space below the cantilever shelter structure is used as a coal transportation channel, and the upright posts 400 and the lifting seat 200 are both arranged away from the space below the cantilever shelter structure 110.
The frame moving process of the advanced support comprises a deviation rectifying working condition, and the deviation rectifying jack 600 at one side of the extension base 300 can be used for supporting by means of roadway walls or other objects, so that the advanced support can rectify the deviation to the other side, and the advanced support can move according to a preset route.
Wherein, two groups of pushing jacks 500 are arranged between two adjacent advance brackets. The two groups of pushing jacks 500 realize the mutual pushing process between two adjacent brackets and can also control the action steering or not.
Further, the base 300 adopts a ship-shaped integral structure, the integral base 300 has high strength, large ground area and small specific pressure to the bottom plate.
Further, the lifting seat 200 is composed of a seat body, a primary lifting rod and a secondary lifting rod, the seat body is welded by steel plates to form a hollow cylinder, the primary lifting rod and the secondary 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 400, and meanwhile the function of stably connecting the top beam 100 with the base 300 is achieved.
Further, a retractable safety pedestrian mechanism 700 is provided between two adjacent lead brackets. The pedestrian safety mechanism 700 is formed by overlapping two steel plates, wherein one sides of the two steel plates are respectively fixed on the edges of the adjacent bases 300 by bolts, and the other sides of the two steel plates are mutually overlapped to form a gap bridge or overlap. When the pushing jack 500 extends out, the two pedestrian linkage plates are mutually overlapped to form a bridge; when the pushing jack 500 is contracted, the two pedestrian linkage plates overlap.
In the advanced self-moving support method of the mining face end head and the gate way, the frame moving process of the bracket relates to the following steps:
and (3) frame moving working conditions: the transverse advance moving support of the coal face is generally composed of more than two frames, and the front frames and the rear frames are linked through a pushing jack 500; the front frame falls the upright column 400, the front frame top beam 100 does not bear pressure, the rear frame top beam 100 keeps in contact with the top plate, and the front frame transversely moves forwards by taking the rear frame as a base point through the overhanging pushing jack 500; the front frame stretches 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 transversely moves forwards by shrinking the pushing jack 500 with the front frame as a base point;
supporting working conditions: the top beam 100 is of a box type integral shield structure, one side of the top beam 100 is linked with the base 300 through four upright posts 400 and the lifting seat 200 to form a supporting body, and the full-section surface of the top beam 100 can contact a supporting top plate; the four upright posts 400 are reserved with pedestrian safety distances, 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;
correcting working conditions: in the process of moving the transverse advance support, the correction jack 600 can be used for supporting the support by extending one side of the base 300 and supporting the support by means of the roadway side or other objects, so that the correction of the advance support to the other side is realized, and the movement of the advance support according to a preset route is realized.
In summary, the mining face end and the crossheading advanced self-moving support method provided by the embodiment have at least the following beneficial effects and advantages:
(1) The top beam 100 with an integral box structure is adopted to support the top plate, so that the supporting safety is improved;
(2) The two adjacent support brackets can move transversely by means of force, and move forward along with the working face, and move forward from back to front, so that the support length is shortened along with the working face, the production shift shrinkage and maintenance shift stretching are realized, and the telescopic length of the bracket group is determined according to the daily propelling degree of the working face;
(3) The top beam 100 of the integral box 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 frame moving has the functions of correcting and steering;
(5) A telescopic safety pedestrian mechanism 700 is arranged, a pedestrian passage is formed by surrounding the lower part of the top beam 100 and the four upright posts 400, and the pedestrian passage is provided by matching with a bridge or overlapping steel plates of the safety pedestrian mechanism 700.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A mining face end head and a crossheading advanced self-moving support method is characterized in that:
the automatic lifting device comprises 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 is of 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 rectifying jack comprises a plurality of bases which are respectively arranged at four corners of the base and are used for assisting in supporting and rectifying, and two ends of the pushing jack are respectively connected with the bases of two adjacent advance supports;
the device comprises a plurality of groups of brackets which are arranged in a row in the end head of a working surface and in an advance gateway through the pushing jacks and are arranged between the end brackets in series, wherein the pushing jacks among the brackets keep an extending state before the working surface is back-extracted and pushed, and the groups of brackets move by corresponding frames from back to front along with the forward pushing of a cutter by the working surface;
two groups of pushing jacks are arranged between two adjacent advance brackets;
a telescopic safety pedestrian mechanism is arranged between two adjacent advanced supports and comprises two steel plates which are overlapped, one sides of the two steel plates are respectively fixed on the edges of the adjacent bases by bolts, and the other sides of the two steel plates are mutually overlapped to form a gap bridge or overlap.
2. The mining face end and crossheading advanced self-moving support method according to claim 1, wherein the method comprises the following steps: the advanced support length 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 frame spacing is C meters, the maximum frame spacing is B+C meters, and the stroke of the pushing jack is B meters and the coal cutting circulation cutting depth of the working face are consistent;
the working face adopts a three-eight system two-mining one-standard working mode, a shift is prepared to shift the advance supports, the number of the arranged advance supports on the gate is not less than n, and before stoping of the working face, the shifting jacks among the supports in the group of supports are in an extending state, wherein the length of the advance supports is L=n (A+B+C); after the working face daily cuts the coal n-cutter, the length of the advance support is I=L-n×B=n (A+C), wherein I is not less than 20 m.
3. The mining face end and crossheading advanced self-moving support method according to claim 1, wherein the method comprises the following steps: the base adopts a ship type integral structure.
4. The mining face end and crossheading advanced self-moving support method according to claim 1, wherein the method comprises the following steps: the top beam extends out of the base to form a cantilever shelter structure.
5. The mining face end and crossheading advanced self-moving support method according to claim 1, wherein the method comprises the following steps: the lifting seat is composed of a seat body, a primary lifting rod and a secondary lifting rod, wherein the seat body is a hollow cylinder formed by welding steel plates, and the primary lifting rod and the secondary lifting rod are sleeved on the inner side of the seat body so as to meet the requirement of the double-telescopic upright column on the large expansion ratio.
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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| Publication Number | Publication Date |
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| CN112177654A CN112177654A (en) | 2021-01-05 |
| CN112177654B true 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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|---|---|
| CN112177654A (en) | 2021-01-05 |
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