CN220555965U - Flexible self-moving hydraulic support for coal mine and hydraulic support group - Google Patents
Flexible self-moving hydraulic support for coal mine and hydraulic support group Download PDFInfo
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- CN220555965U CN220555965U CN202322262036.4U CN202322262036U CN220555965U CN 220555965 U CN220555965 U CN 220555965U CN 202322262036 U CN202322262036 U CN 202322262036U CN 220555965 U CN220555965 U CN 220555965U
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- 239000003245 coal Substances 0.000 title claims abstract description 47
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 230000000452 restraining effect Effects 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 5
- 238000005065 mining Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002436 steel type Substances 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
- E21D23/0034—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 comprising a goaf shield articulated to a base member
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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
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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)
- Supports For Pipes And Cables (AREA)
Abstract
The utility model discloses a flexible self-moving hydraulic support for a coal mine and a hydraulic support group, which comprise a top beam, a base and an adjusting device which is arranged between the top beam and the base and is used for adjusting the relative distance between the top beam and the base, wherein the adjusting device comprises a stabilizing mechanism and an adjustable lifting support, one end of the stabilizing mechanism is connected with one end of the top beam, and the other end of the stabilizing mechanism is hinged with the base and is used for restraining the relative position between the top beam and the base; two ends of the adjustable lifting support are respectively hinged with the top beam and the base, and flexible connecting seats are arranged on two outer side surfaces of at least one of the top beam, the base and the adjusting device; the hydraulic supports are connected through flexible connecting pieces to form a flexible hydraulic support group, and the hydraulic support group is distributed above the inclined coal seam. When the hydraulic support needs to be moved, the adjustable lifting support is operated to release pressure, the top beam of the hydraulic support is separated from the top plate and moves under the gravity action of the hydraulic support and the gangue, so that the controllable movement of the hydraulic support group is realized, and the damage to equipment and personnel safety caused by sudden movement of the hydraulic support is avoided.
Description
Technical Field
The utility model relates to the technical field of coal seam mining, in particular to a flexible self-moving hydraulic support and a hydraulic support group for a coal mine, which are applied to steep coal seam mining.
Background
The hydraulic support is an important production device for mining of coal mine workers, the common fully-mechanized support is matched with a coal mining machine and a conveyor to be mature, and the hydraulic support is successfully applied to the coal mine production process of a near-horizontal coal seam in a large number. When the support is used, the pushing rod is connected with the conveyor, the supports are not connected, and the support is pushed and pulled mutually by the conveyor under the action of the pushing jack, so that the support can move forwards. However, when the coal seam has an inclination angle, especially when the inclination angle of the working surface is larger than 30 degrees, the support starts to topple and slide down, and a top side protection and bottom adjustment device needs to be added on the support, so that the structure is relatively complex. If the angle is further increased to 45 degrees, the problems of tilting prevention, skid prevention, gangue blocking and the like of the bracket are more complicated. Generally, the coal seam with the inclination angle larger than 45 degrees is classified as a steeply inclined coal seam, and belongs to a complex and difficult-to-mine coal seam, the traditional roadway collapse method is forbidden because the safety regulation requirements are not met, and the method for forming an arm-type working face by adopting pseudo-inclined arrangement and adopting a simple I-steel type flexible shielding bracket or a flexible shielding hydraulic bracket produced by Beijing Chengda company is adopted in the feasible scheme. The principle of the two brackets is similar, all brackets are connected together through steel wires or chains to form a flexible supporting whole body, goaf gangue is isolated, working face space is covered, the brackets automatically move downwards by the gravity of the brackets and the goaf gangue, but the downward moving process is uncontrolled movement, the moving time and distance are influenced by the conditions of a top plate and a bottom plate, the states of adjacent brackets, the coal mining depth and other conditions, and great difficulty is brought to steep mechanical mining and safety management. The utility model discloses a flexible self-moving hydraulic support, which aims to overcome the defects of a common fully-mechanized mining support, a flexible shield type support and a flexible shield type hydraulic support in steep mining.
Disclosure of Invention
In order to facilitate exploitation of a highly inclined coal seam, solve the technical problems existing in the conventional flexible shield hydraulic support, realize controlled movement of the support, provide a safer coal mining environment for exploitation of a highly inclined coal seam, and provide the flexible self-moving hydraulic support and the hydraulic support group for the coal mine.
The technical scheme adopted is as follows:
the flexible self-moving hydraulic support for the coal mine comprises a top beam, a base and an adjusting device which is arranged between the top beam and the base and is used for adjusting the relative distance between the top beam and the base, wherein the adjusting device comprises a stabilizing mechanism and an adjustable lifting support, one end of the stabilizing mechanism is connected with one end of the top beam, and the other end of the stabilizing mechanism is hinged with the base and is used for restraining the relative position between the top beam and the base; the two ends of the adjustable lifting support are hinged with the top beam and the base respectively, and flexible connecting seats are arranged on the two outer side surfaces of at least one of the top beam, the base and the adjusting device.
Preferably, the adjustable lifting support is a hydraulic support.
The outer side surface of the top beam or the base or the adjusting device is provided with flexible connecting seats, wherein flexible connecting pieces are arranged on at least two flexible connecting seats.
Preferably, the hydraulic struts are arranged at least two in front and back along the length direction of the top beam.
Further, limiting blocks are further arranged on the two outer side surfaces of the top beam and/or the base and used for limiting the minimum gap between two adjacent brackets.
Further, an extension beam is mounted at the end of the top beam remote from the stabilizing mechanism, the extension beam being manually or hydraulically adjustable in length to extend beyond the end of the top beam.
Preferably, the stabilizing mechanism is of a four-bar structure and comprises a shield beam, an inner connecting bar and an outer connecting bar, one end of the shield beam is hinged with one end of the top beam, the other end of the shield beam is respectively hinged with one ends of the inner connecting bar and the outer connecting bar, and the other ends of the inner connecting bar and the outer connecting bar are hinged with the base.
Or preferably, the stabilizing mechanism is of a guide rod type structure and comprises a sleeve and a guide rod, and the sleeve and the guide rod are arranged perpendicular to the bottom surface of the base; one end of the sleeve is fixedly connected with the base, the lower part of the guide rod is arranged in the inner cavity of the sleeve, the sleeve and the guide rod form relative sliding connection, and the upper end of the guide rod is connected with the top beam.
Or preferably, the stabilizing mechanism is of a single swing rod type structure and comprises a fixed support and a swing rod, wherein the fixed support is fixed on the base, and two ends of the swing rod are respectively hinged with the fixed support and the top beam.
Further, flexible connecting seats are arranged on the outer side surfaces of the top beam or the base or the adjusting device, and flexible connecting pieces are arranged on at least two flexible connecting seats.
On the other hand, the utility model also provides a flexible self-moving hydraulic support group for coal mines, which comprises the plurality of hydraulic supports, wherein the hydraulic supports are distributed above an inclined coal body between a top plate and a bottom plate along the width direction of the top beam, two adjacent hydraulic supports are in flexible series connection with a flexible connecting piece through a flexible connecting seat arranged on the outer side surface of the two adjacent hydraulic supports, the moving direction of the hydraulic supports after being connected is not perpendicular to the roadway direction of the working surface, and the included angle is not less than 45 degrees.
The technical scheme of the utility model has the following advantages:
A. the utility model adopts a controllable moving frame structure, an adjusting device is arranged between the top beam and the base and is supported on the top plate and the bottom plate of the coal seam, the position is fixed, when the bracket needs to be moved, the adjustable lifting support is operated to release pressure, the top beam of the bracket is separated from the top plate and moves under the action of gravity of the bracket and gangue, thereby realizing the controllable movement of the bracket and avoiding damage to equipment and personnel safety caused by sudden movement of the bracket.
B. The utility model has strong supporting capability on the roof, adopts the contact of the support top beam and the roof, has larger supporting force on the roof due to the larger extension supporting surface formed under the auxiliary action of the extension beam, has larger supporting area and stronger supporting capability, and can avoid casualties caused by the partial upper of the roof.
C. Compared with the conventional flexible shield type hydraulic support, the hydraulic support has stronger supporting capability, and compared with the hydraulic support of a common coal seam, the hydraulic support is connected together by adopting the flexible connecting piece, and the hydraulic support is controlled to move downwards by virtue of dead weight when being controlled to move downwards, so that the hydraulic support is more labor-saving and convenient to operate, has good overall mobility and has stronger anti-falling and anti-skid capabilities.
D. Compared with the conventional common hydraulic support, the working surface adopts an inclined arrangement mode which is not perpendicular to the direction of the roadway, so that the actual inclination angle of the working surface can be reduced, and the walking and equipment operation of personnel are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present utility model, the drawings that are required for the embodiments will be briefly described, and it will be apparent that the drawings in the following description are some embodiments of the present utility model and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a self-moving hydraulic mount provided by the present utility model;
FIG. 2 is a top view of the FIG. 1;
FIG. 3 is a schematic view of the usage state provided by the present utility model;
FIG. 4 is an illustration of a flexible self-moving hydraulic support of the guide rod type provided by the present utility model;
FIG. 5 is an illustration of a single rocker flexible self-moving hydraulic mount provided by the present utility model;
fig. 6 is a view of a hydraulic support set according to the present utility model for coal mining on an inclined surface.
Fig. 7 is a view showing a conventional bracket set for coal mining operation on an inclined surface.
The identification symbols provided in the figures are described below:
1-an extension beam; 2-top beam; 3-flexible connection; 4-limiting block
5-adjusting device
51-a stabilizing mechanism, which is provided with a plurality of stabilizing elements,
51a 1-shield beam, 51a 2-inner link, 51a 3-outer link
51b 1-sleeve, 51b 2-guide rod
51c 1-fixed support, 51c 2-swing rod
52-adjustable lifting prop
6, a base; 7-a flexible connection base; 8-top plate; 9-a bottom plate; 10-gangue; 20-coal body.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 and 2, the utility model provides a flexible self-moving hydraulic support for coal mines, which comprises a top beam 2, a base 6 and an adjusting device 5 arranged between the top beam 2 and the base 6 and used for adjusting the relative distance between the top beam 2 and the base 6, wherein the adjusting device 5 comprises a stabilizing mechanism 51 and an adjustable lifting support 52, one end of the stabilizing mechanism 51 is connected with one end of the top beam 2, and the other end of the stabilizing mechanism is connected with the base 6 and used for restraining the relative position between the top beam 2 and the base 6; the adjustable lifting support 52 is preferably a hydraulic support, two ends of the hydraulic support are respectively hinged with the top beam 2 and the base 6, flexible connecting seats 7 are arranged on two outer side surfaces of the top beam 2 or the base 6 or the adjusting device 5, and the connection between adjacent supports is realized by installing flexible connecting pieces 3, so that the whole supporting capacity is improved. The flexible connection seat 7 can be arranged on one of the outer side surfaces of the top beam 2, the base 6 and the adjusting device 5, or can be arranged on the outer side surfaces of two parts, or the flexible connection seat 7 is respectively arranged at the corresponding positions of the two outer side surfaces of the top beam 2, the base 6 and the adjusting device 5, and the detailed description is omitted.
In fig. 1, two hydraulic struts are arranged in a front-back manner along the length direction of the top beam 2, and the top ends of the hydraulic struts are arranged at the rear position of the top beam 2, so that the stability and the capability of controlling the top plate are improved, and of course, more hydraulic struts can be arranged.
In order to further increase the supporting length of the top beam 2, the utility model also installs the extension beam 1 at the end of the top beam 2, the extension beam 1 can realize extension along the length direction of the top beam 2, the extension beam 1 can be a hydraulic beam structure or a manual adjusting structure, and the extension distance or the contraction distance of the extension beam 1 can be controlled according to the supporting requirement.
The stabilizing mechanism 51 shown in fig. 1 has a four-bar structure, and the stabilizing mechanism 51 includes a shield beam 51a1, an inner link 51a2, and an outer link 51a3, wherein one end of the shield beam 51a1 is hinged to one end of the roof beam 2, the other end of the shield beam 51a1 is hinged to one end of the inner link 51a2 and one end of the outer link 51a3, and the other ends of the inner link 51a2 and the outer link 51a3 are hinged to the base 6, i.e., both ends of the inner link 51a2 and the outer link 51a3 are hinged to the shield beam 51a1 and the base 6, respectively.
Meanwhile, the flexible connecting seats 7 for installing the flexible connecting pieces 3 are arranged on the top beam 2, the shield beam 51a1, the inner connecting rod 51a2, the outer connecting rod 51a3 and the base 6, in fig. 1, the flexible connecting seats 7 are arranged on two outer side surfaces of the top beam 2, the shield beam 51a1, the inner connecting rod 51a2, the outer connecting rod 51a3 and the base 6, and of course, the flexible connecting seats 7 can also be arranged on two sides of one or two or more parts of the shield beam 51a1, the inner connecting rod 51a2 and the outer connecting rod 51a3, and when needed, adjacent two brackets can be directly connected together through the flexible connecting pieces 3, and the flexible connecting pieces 3 can be chains or steel wires.
As shown in fig. 4, the stabilizing mechanism 51 may also adopt a guide rod type structure, which includes a sleeve 51b1 and a guide rod 51b2, and is disposed parallel to the adjustable lifting support 52; one end of the sleeve 51b1 is fixedly connected with the base 6, the lower part of the guide rod 51b2 is arranged in the inner cavity of the sleeve 51b1, the sleeve and the guide rod form relative sliding connection, and the upper end of the guide rod 51b2 is connected with the top beam 2. When the adjustable lifting support 52 is controlled to move up and down, the guide rod can be moved up and down along the sleeve, so that the distance between the top beam 2 and the base 6 is adjusted.
As shown in fig. 5, the stabilizing mechanism 51 may also adopt a single swing rod type structure, which includes a fixed support 51c1 and a swing rod 51c2, the fixed support 51c1 is fixedly disposed on the base 6, and two ends of the swing rod 51c2 are respectively hinged with the fixed support 51c1 and the top beam 2. When the adjustable lifting support 52 is controlled to move up and down, the distance between the top beam 2 and the base 6 can be adjusted through the swinging of the swinging rod.
Of course, the stabilizing mechanism 51 employed in the present utility model is not limited to the above-described structure, and other stabilizing structures that follow the adjustable lifting strut 52 may be employed.
In order to more conveniently control the activity of the brackets, the utility model is also provided with a limiting block 4 on the top beam 2, which is used for limiting the variation range of the gap between the adjacent brackets.
After a plurality of self-moving hydraulic supports are connected with each other in the direction perpendicular to the paper surface of fig. 3 through flexible connecting pieces, a self-moving hydraulic support group is formed, as shown in fig. 6. The hydraulic supports are distributed in the inclined roadway along the width direction of the top beam, two adjacent hydraulic supports are in flexible series connection with the flexible connecting piece through the flexible connecting seat arranged on the outer side face of the hydraulic supports, and an included angle a formed by the moving direction of the hydraulic supports after connection and the roadway direction of the working face meets the requirement of 45 degrees being less than 90 degrees.
The moving process of each hydraulic bracket is as shown in fig. 3:
(1) Under the action of the hydraulic prop, the top beam 2 and the base 6 of the hydraulic prop are supported on the top plate 8 and the bottom plate 9 of the working surface, and the front end of the top beam 2 (or the front end of the expansion beam 1) is contacted with the coal body 20.
(2) The coal body 20 is mined, and a certain distance is generated between the front end of the top beam 2 (or the front end of the extension beam 1) and the coal body 20. When mining, such as when the extension beam 1 extends and collides with the coal mining process or equipment, the extension beam 1 can be adjusted to retract until the coal is discharged, and then the extension beam is readjusted.
(3) The hydraulic prop is contracted, the top beam is unloaded, the hydraulic prop moves under the gravity action of the hydraulic prop and the rear gangue 10, and the hydraulic prop moves to the front end of the top beam 2 (or the front end of the expansion beam 1) to be contacted with the mined coal body 20 or is limited and stopped by a flexible connecting piece.
(4) The hydraulic prop is extended, so that the hydraulic prop top beam 2 and the base 6 are supported on the top plate 8 and the bottom plate 9 again, and a working cycle of hydraulic prop movement is completed.
According to the hydraulic support, the expansion and contraction of the hydraulic support are controlled one by one, the hydraulic support can be rapidly shifted downwards by means of the self weight of the hydraulic support and the gravity of the gangue above the hydraulic support, and the hydraulic support is not required to be pulled to move forwards by means of a jack. Compared with the distribution mode of the conventional common support, as shown in fig. 7, the movable support is more labor-saving and convenient, so that the coal mining efficiency is improved.
The utility model is applicable to the prior art where nothing is mentioned.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present utility model.
Claims (10)
1. The flexible self-moving hydraulic support for the coal mine comprises a top beam (2), a base (6) and an adjusting device (5) which is arranged between the top beam (2) and the base (6) and is capable of adjusting the relative distance between the top beam and the base, and is characterized in that the adjusting device (5) comprises a stabilizing mechanism (51) and an adjustable lifting support (52), one end of the stabilizing mechanism (51) is hinged with one end of the top beam (2), and the other end of the stabilizing mechanism is connected with the base (6) and is used for restraining the relative position between the top beam (2) and the base (6); the two ends of the adjustable lifting support column (52) are respectively hinged with the top beam (2) and the base (6), and flexible connecting seats (7) are arranged on the two outer side surfaces of at least one of the top beam (2), the base (6) and the adjusting device (5).
2. The flexible self-moving hydraulic support for coal mines according to claim 1, wherein the adjustable lifting support (52) is a hydraulic support.
3. The flexible self-moving hydraulic support for coal mines according to claim 2, wherein a flexible connecting seat (7) is arranged at the outer side surface of the top beam (2) or the base (6) or the adjusting device (5), and at least two flexible connecting seats (7) are provided with flexible connecting pieces (3).
4. A flexible self-moving hydraulic support for coal mines according to claim 3, wherein at least two hydraulic struts are provided in front and back along the length direction of the top beam (2).
5. The flexible self-moving hydraulic support for coal mines according to claim 4, wherein limiting blocks (4) are further arranged at two outer side surfaces of the top beam (2) and/or the base (6) and used for limiting the minimum gap between two adjacent supports.
6. A flexible self-moving hydraulic support for coal mines according to any one of claims 1-5, characterized in that an extension beam (1) is mounted at the end of the top beam (2) remote from the stabilizing mechanism (51), the extension beam (1) being manually or hydraulically adjustable by its length out of the end of the top beam (2).
7. The flexible self-moving hydraulic support for coal mines according to claim 6, wherein the stabilizing mechanism (51) is of a four-bar structure and comprises a shield beam (51 a 1), an inner connecting bar (51 a 2) and an outer connecting bar (51 a 3), one end of the shield beam (51 a 1) is hinged with one end of the top beam (2), the other end of the shield beam (51 a 1) is respectively hinged with one ends of the inner connecting bar (51 a 2) and the outer connecting bar (51 a 3), and the other ends of the inner connecting bar (51 a 2) and the outer connecting bar (51 a 3) are hinged with the base (6).
8. The flexible self-moving hydraulic support for coal mines according to claim 6, wherein the stabilizing mechanism (51) is of a guide rod type structure and comprises a sleeve (51 b 1) and a guide rod (51 b 2), and the sleeve and the guide rod are arranged perpendicular to the bottom surface of the base (6); one end of the sleeve (51 b 1) is fixedly connected with the base (6), the lower part of the guide rod (51 b 2) is arranged in the inner cavity of the sleeve (51 b 1), the sleeve and the guide rod form relative sliding connection, and the upper end of the guide rod (51 b 2) is connected with the top beam (2).
9. The flexible self-moving hydraulic support for coal mines according to claim 6, wherein the stabilizing mechanism (51) is of a single swing rod type structure and comprises a fixed support (51 c 1) and a swing rod (51 c 2), the fixed support (51 c 1) is fixed on the base (6), and two ends of the swing rod (51 c 2) are hinged with the fixed support (51 c 1) and the top beam (2) respectively.
10. The flexible self-moving hydraulic support group for the coal mine is characterized by comprising a plurality of hydraulic supports according to any one of claims 3-9, wherein the hydraulic supports are distributed above an inclined coal body between a top plate and a bottom plate along the width direction of a top beam, two adjacent hydraulic supports are in flexible serial connection with a flexible connecting piece (3) through a flexible connecting seat (7) arranged on the outer side surface of each hydraulic support, and the moving direction of the hydraulic supports after being connected is not perpendicular to the roadway direction of the working surface where the hydraulic supports are located, and the included angle is not less than 45 degrees.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023221372225 | 2023-08-09 | ||
| CN202322137222 | 2023-08-09 |
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| CN220555965U true CN220555965U (en) | 2024-03-05 |
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| CN202322262036.4U Active CN220555965U (en) | 2023-08-09 | 2023-08-22 | Flexible self-moving hydraulic support for coal mine and hydraulic support group |
| CN202311061004.6A Pending CN116927845A (en) | 2023-08-09 | 2023-08-22 | Flexible self-moving hydraulic support for coal mine and hydraulic support group |
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| CN202311061004.6A Pending CN116927845A (en) | 2023-08-09 | 2023-08-22 | Flexible self-moving hydraulic support for coal mine and hydraulic support group |
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| CN116927845A (en) | 2023-10-24 |
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