CN210622832U - N-shaped fully-mechanized mining hydraulic support for steeply inclined coal seam - Google Patents
N-shaped fully-mechanized mining hydraulic support for steeply inclined coal seam Download PDFInfo
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- CN210622832U CN210622832U CN201921553627.4U CN201921553627U CN210622832U CN 210622832 U CN210622832 U CN 210622832U CN 201921553627 U CN201921553627 U CN 201921553627U CN 210622832 U CN210622832 U CN 210622832U
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Abstract
The utility model relates to a hydraulic support technical field is particularly useful for coal seam thickness and is less than 8 meters, and the coal seam inclination is greater than the steeply inclined coal seam exploitation of 45 degrees, can realize the longwall formula of above-mentioned coal seam and strut the exploitation, is a steeply inclined coal seam n shape combines and adopts hydraulic support. The gob shield beam is hinged with the gob hinged beam and then faces the gob, the roof side support beam, the gob shield beam, the gob hinged beam and the bottom plate side support beam are hinged to form a support with an n-shaped structure, and at least one row of two support columns is arranged between the roof side support beam and the bottom plate side support beam. The utility model has the advantages of reasonable and compact structure, convenient to use, the coal seam exploitation of adaptable different coal seam thickness, different coal seam angles can effectively reduce intensity of labour, improves operating efficiency and exploitation output.
Description
Technical Field
The utility model relates to a hydraulic support technical field is particularly useful for coal seam thickness and is less than 8 meters, and the coal seam inclination is greater than the steeply inclined coal seam exploitation of 45 degrees, can realize the longwall formula of above-mentioned coal seam and strut the exploitation, is a steeply inclined coal seam n shape combines and adopts hydraulic support.
Background
The three machines of the traditional hydraulic support, the traditional coal mining machine and the traditional scraper conveyor are matched with a long-wall type mining working surface, the support is arranged in a mode that a support top beam supports a top plate, a support base supports a bottom plate, and the support top beam and the support base are parallel to the bottom surface of the working surface (namely, a hole is cut), namely, the support is arranged in a c-shaped structure. The three machines consisting of the hydraulic support, the coal mining machine and the scraper conveyor are arranged along the trend of the coal bed and are propelled along the trend of the coal bed, the coal mining machine mines the coal on the coal wall at the front part of the support along the trend of the coal bed, the downward sliding force of the three machines along the working face is increased along with the increase of the inclination angle of the coal bed in the coal mining method, the operation and maintenance difficulty is increased, and the three machines cannot be used finally after the inclination angle of the coal bed is gradually increased to a certain angle. At present, the traditional three-machine matched longwall mining method used in a large-inclination-angle coal seam is continuously researched, solved and overcome the problems of support fall prevention and skid prevention when the working face angle is large and skid prevention and use of a scraper in the large-inclination-angle coal seam, and the traditional three-machine matched longwall mining method has no good solution scheme in the large-inclination-angle coal seam, particularly the coal seam with the angle gradually approaching 90 degrees.
In the mining of the steep coal seam, a flexible shield support mining method and a small-stage coal seam hydraulic support mining process are adopted for mining the steep coal seam with the coal seam thickness of less than 8 meters and the coal seam inclination angle of more than 45 degrees, but all the defects exist, and the mining method is not suitable for the mining of the steep coal seam. The coal seam has no supporting, supporting and mining equipment which is reliable and practical and is matched with the coal seam for use, and the coal seam has to be abandoned for mining at present.
The flexible shield support mining method is characterized in that a return air crossheading parallel to the horizontal plane is arranged at the middle upper part of a steep coal seam, a transportation crossheading parallel to the horizontal plane is arranged at the lower part away from the return air crossheading by a certain distance, a working face roadway penetrates between an upper roadway and a lower roadway, and the included angle between the working face roadway and the horizontal plane is about 20-40 degrees. In the process that the flexible shield support is pushed downwards, the lower shield support gradually enters the transportation gateway, and the support entering the transportation gateway needs to be continuously transported to the upper return air gateway for support supplement, so that the labor intensity is high. In addition, the bracket is applicable to a small range of coal seam thickness, the coal seam is lost when being thickened, the coal seam cannot be used when being thinned, different coal seam changes need to be provided with flexible shield brackets with different lengths, and the problems of inconvenience in use, low mechanical mining efficiency, high labor intensity, low yield, instability of the bracket, poor safety and the like exist.
The method adopts a small-stage coal seam hydraulic support mining process, the roadway of the support is arranged in a way that a return air crossheading parallel to a horizontal plane is arranged at the middle upper part of a steep coal seam, a transportation crossheading parallel to the horizontal plane is arranged at the lower part which is about 20 meters away from the return air crossheading, and a ventilation hole with the diameter of about 800mm is arranged between an upper roadway and a lower roadway at the interval of 6 meters so that the upper roadway and the lower roadway are communicated to form U-shaped ventilation. The support is arranged in the lower transportation crossheading channel, and the advancing direction of the support is to push forwards along the transportation crossheading. According to the arrangement mode, the ventilation holes in the rear part and the upper part of the support cannot realize U-shaped ventilation due to collapse damage or support top beam shielding, the ventilation holes in the front part of the support can realize U-shaped ventilation, but fresh air cannot reach the working position of the support, the working position of the support is a blind roadway, so that gas gathering is easy to bring great potential safety hazard, in 2016, the safety U-shaped ventilation system cannot be constructed due to a single-thick coal-seam horizontal subsection top coal caving coal mining method with a steep inclination of 4-8 meters, the risk of gathering toxic and harmful gas in the working face exists, and the U-shaped ventilation system is eliminated by a coal security inspection department, and the conventional equipment and mining.
Disclosure of Invention
The utility model provides a hydraulic support is adopted to full-mechanized mining of steeply inclined coal seam n shape has overcome above-mentioned prior art not enough, and it can effectively solve ventilation problem, the three supporting longwall type mechanized mining problem that appears of current support in the steeply inclined coal seam exploitation in-process. The coal bed which can not be exploited is changed into the coal bed which can be exploited again, the exploitation efficiency of the coal bed can be greatly improved, the safety is improved, and the automatic exploitation level is improved.
The technical scheme of the utility model is realized through following measure: the n-shaped fully-mechanized mining hydraulic support is characterized by comprising a top plate side supporting beam positioned on the top plate side, a goaf shielding beam, a goaf hinged beam, a bottom plate side supporting beam positioned on the bottom plate side and a stand column, wherein the goaf shielding beam is hinged with the goaf hinged beam and then faces the goaf, the top plate side supporting beam, the goaf shielding beam, the goaf hinged beam and the bottom plate side supporting beam are hinged to form a support of an n-shaped structure, at least one row of supporting stand columns are arranged between the top plate side supporting beam and the bottom plate side supporting beam, and each row of supporting stand columns comprises two supporting stand columns which are arranged in parallel.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the upper part of the roof side supporting beam is hinged with a goaf shield beam, the upper part of the floor side supporting beam is hinged with a goaf hinged beam, and the goaf shield beam and the goaf hinged beam are hinged together; at least one row of supporting columns are arranged between the top plate side supporting beam and the bottom plate side supporting beam, one end of each row of supporting columns is connected with the top plate side supporting beam, and the other end of each row of supporting columns is connected with the bottom plate side supporting beam.
And a balance jack is also arranged between the upper part of the top plate side supporting beam and the gob shield beam, one end of the balance jack is hinged with the top plate side supporting beam, and the other end of the balance jack is hinged with the gob shield beam.
Two rows of supporting columns are arranged between the top plate side supporting beam and the bottom plate side supporting beam.
The goaf hinged beam can comprise a first hinged beam and a second hinged beam, two ends of the first hinged beam are hinged with the upper ends of the goaf shield beam and the bottom plate side support beam respectively, two ends of the second hinged beam are hinged with the upper portions of the goaf shield beam and the bottom plate side support beam respectively, and the first hinged beam, the second hinged beam, the goaf shield beam and the bottom plate side support beam jointly form a four-link mechanism.
The lower parts of the top plate side supporting beam and the bottom plate side supporting beam are respectively provided with a telescopic leg for lifting the support, and the telescopic legs are driven by a hydraulic oil cylinder to extend and retract.
The layout of the n-shaped fully-mechanized mining hydraulic support for the steeply inclined coal seam on the working face comprises a plurality of n-shaped fully-mechanized mining hydraulic supports for the steeply inclined coal seam, the top plate side supporting beams of every two adjacent n-shaped fully-mechanized mining hydraulic supports for the steeply inclined coal seam are connected together through a left pull frame oil cylinder, and the bottom plate side supporting beams of every two adjacent n-shaped fully-mechanized mining hydraulic supports for the steeply inclined coal seam are connected together through a right pull frame oil cylinder.
The utility model discloses three machines match the ability reinforce, can match the coal-winning machine, scrape the trigger and constitute three supporting equipments, and coal seam adaptability is strong, and is applicable to be less than 8 meters in the coal seam thickness, and the coal seam inclination is greater than the steeply inclined coal seam exploitation of 45 degrees. Through the arrangement of the n-shaped structural support, the coal bed which cannot be mined is changed into a coal bed which can be mined again, the mining efficiency of the coal bed can be greatly improved, the safety is improved, and the automatic mining level is improved. The whole body of the n-shaped fully-mechanized mining hydraulic support of the adjacent steep coal seam is moved upwards by pulling the n-shaped fully-mechanized mining hydraulic support of the adjacent steep coal seam, the support is prevented from jumping into a transportation crossheading in the operation process, the lower support is prevented from working towards an upper return air crossheading reversing frame, the labor intensity is effectively reduced, and the operation efficiency is improved.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural view of the arrangement of a return air crossheading, a working face roadway and a transportation crossheading in a main view.
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2.
Fig. 4 is the moving track schematic diagram of the n-shaped fully mechanized mining hydraulic support of two adjacent steeply inclined coal seams of the utility model.
The codes in the figures are respectively: the device comprises a top plate side supporting beam 1, a goaf shielding beam 2, a goaf hinged beam 3, a first hinged beam 3-1, a second hinged beam 3-2, a bottom plate side supporting beam 4, a supporting upright column 5, a telescopic leg 6, a vertical shaft 7, an air return crossheading 8, a working face roadway 9, a transportation crossheading 10, a coal bed 11, a top plate 12, a bottom plate 13, a right-side pull frame oil cylinder 14, a balance jack 15, a left-side pull frame oil cylinder 16, a support A, an uppermost steeply inclined coal bed n-shaped fully-mechanized mining hydraulic support and a support B, wherein the support B is a steeply inclined coal bed n-shaped fully-mechanized mining hydraulic support adjacent to the support A.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention will be further described with reference to the following examples and drawings:
example 1: as shown in the attached drawings 1 to 4, the n-shaped fully mechanized mining hydraulic support for the steeply inclined coal seam is perpendicular to the bottom surface of a working face for supporting and propelling along the trend of the coal seam 11, and comprises a top plate side supporting beam 1 located on the side of a top plate 12, a goaf shielding beam 2, a goaf hinged beam 3, a bottom plate side supporting beam 4 located on the side of a bottom plate 13 and supporting columns 5, wherein the goaf shielding beam 2 is hinged with the goaf hinged beam 3 to face the goaf, the top plate side supporting beam 1, the goaf shielding beam 2, the goaf hinged beam 3 and the bottom plate side supporting beam 4 are hinged to form a support with an n-shaped structure, at least one row of supporting columns is arranged between the top plate side supporting beam 1 and the bottom plate side supporting beam 4, and each row of supporting columns comprises two supporting columns 5 which are arranged in. The support columns 5 are known in the art and typically employ hydraulic props.
The technical scheme of the utility model be with traditional three-wheeled machine supporting longwall type mining working face c shape structural support arrange to change n shape structural support and arrange, concrete method is the pseudo-slope of working face tunnel and arranges, the support back timber (promptly the utility model discloses a roof side props roof beam 1) and supports roof 12, the support base (promptly the utility model discloses a roof side props roof beam 4) supporting baseplate 13, support back timber, base are arranged by parallel and working face (promptly cut the eye) bottom surface and are become perpendicular to working face bottom surface and arrange, and stand 5 through connecting between roof side props roof beam 1 and roof side prop roof beam 4 realizes stretching out and drawing in between the roof side roof beam, realizes the close contact support of roof side props roof beam 1 and roof 12, realizes the close contact support of roof side prop roof beam 4 and bottom plate 13. Thus, the stability of the utility model is ensured. Make roof side supporting beam 1 and roof 12 in close contact with through flexible support post 5 to the coal seam of different thickness, the roof side supporting beam 4 and bottom plate 13 in close contact with make the utility model discloses adapt to the needs of strutting of different coal seam thickness, coal seam angle.
According to the actual need, the n-shaped fully-mechanized mining hydraulic support for the steeply inclined coal seam can be further optimized or/and improved:
as shown in the attached drawings 1 to 4, the upper part of a roof side supporting beam 1 is hinged with a goaf shield beam 2, the upper part of a floor side supporting beam 4 is hinged with a goaf hinged beam 3, and the goaf shield beam 2 and the goaf hinged beam 3 are hinged together; at least one row of supporting columns are arranged between the top plate side supporting beam 1 and the bottom plate side supporting beam 4, one end of each row of supporting columns 5 is connected with the top plate side supporting beam 1, and the other end of each row of supporting columns 5 is connected with the bottom plate side supporting beam 4. During the operation, will the utility model discloses arrange in working face tunnel 9, roof side supporting beam 1 and bottom plate side supporting beam 4 respectively with roof 12 and bottom plate 13 contact to tight roof 12 and bottom plate 13 in the effect of stand 5 down in top respectively, from this bottom plate side supporting beam 4, roof side supporting beam 1, collecting space area shield roof beam 2 and collecting space area hinged beam 3 and working face tunnel 9 form the operation space that link up around jointly, the coal-winning machine is in the utility model discloses a below is operated, not only provides safe operation region for it, and the ventiduct in the mining operation also can be regarded as to this operation space simultaneously, has guaranteed the normal operation of coal-winning machine promptly, has also avoided because the phenomenon that the ventilation is not smooth to cause the incident takes place.
As shown in the attached figures 1 and 3, a balance jack 15 is further arranged between the upper part of the top plate side supporting beam 1 and the goaf shield beam 2, one end of the balance jack 15 is hinged with the top plate side supporting beam 1, and the other end of the balance jack 15 is hinged with the goaf shield beam 2. Therefore, the utility model has better balance performance in the operation process.
Two rows of supporting columns are arranged between the top plate side supporting beam 1 and the bottom plate side supporting beam 4 according to requirements. The utility model discloses can design for no balanced jack 15, and set up two rows of support post 5's support, like this, can reach better balance performance equally.
As shown in the attached drawings 1 and 3, the goaf hinged beam 3 comprises a first hinged beam 3-1 and a second hinged beam 3-2, two ends of the first hinged beam 3-1 are hinged with the upper ends of the goaf shield beam 2 and the floor side support beam 4 respectively, two ends of the second hinged beam 3-2 are hinged with the upper portions of the goaf shield beam 2 and the floor side support beam 4 respectively, and the first hinged beam 3-1, the second hinged beam 3-2, the goaf shield beam 2 and the floor side support beam 4 jointly form a four-link mechanism. This enables stable support to be maintained when the positions of the roof side brace 1 and the floor side brace 4 are changed relative to each other.
As shown in fig. 1 and 3, telescopic legs 6 for lifting and lowering the support are arranged at the lower parts of the top plate side supporting beam 1 and the bottom plate side supporting beam 4, and the telescopic legs 6 are driven to extend and retract by hydraulic cylinders or jacks arranged on the top plate side supporting beam 1 and the bottom plate side supporting beam 4. Therefore, the vertical height of the top plate side supporting beam 1 and the bottom plate side supporting beam 4 can be adjusted, and the support is driven to move downwards.
Example 2: as shown in the attached figure 2, the steeply inclined coal seam is mined horizontally in sections, a return air crossheading 8 is horizontally arranged along the direction of the coal seam 11 at the upper part of the section, and a transportation crossheading 10 is horizontally arranged along the direction of the coal seam at the lower part of the section to reach the boundary of a mining area. The cutting holes (working face laneways 9) are obliquely arranged along the direction of the coal seam, the included angle range of the cutting holes and the transportation crossheading 10 is 8 degrees to 40 degrees, the return air crossheading 8 and the transportation crossheading 10 are communicated with the ground through a vertical shaft 7, as shown in the attached drawing 3, the rock stratum at the left part of the working face laneways 9 is a top plate 12, and the rock stratum at the right part of the working face laneways 9 is a bottom plate 13. According to the requirement, a plurality of n-shaped fully-mechanized mining hydraulic supports of steeply inclined coal seams are arranged along a working face roadway 9, top plate side supporting beams 1 of every two adjacent steeply inclined coal seam n-shaped fully-mechanized mining hydraulic supports are connected together through a left pull frame oil cylinder 16, bottom plate side supporting beams 4 of every two adjacent steeply inclined coal seam n-shaped fully-mechanized mining hydraulic supports are connected together through a right pull frame oil cylinder 14, as shown in figure 4, the supports are matched in such a way that the telescopic legs 6 are appropriately contracted by the support top plate side supporting beams 1, coal at the lower parts of the telescopic legs 6 is cut and mined by a coal mining machine roller, the telescopic legs 6 of the support top plate side supporting beams 1 extend out for supporting, after mining for a certain width, a scraper conveyor is pushed by a pushing oil cylinder connected with the scraper to the lower parts of steps through the support top plate side supporting beams 1, the working face is cut, mining continues towards the direction of the support bottom plate side, the telescopic legs 6 are properly contracted by the support beams 4 on the side of the support bottom plate, and the coal mining machine roller cuts and mines coal at the lower parts of the telescopic legs. The telescopic legs 6 of the support beams 4 on the roof side of the support after mining are extended and supported. After all the coal in a working face is mined, the working face support sequentially relieves pressure from bottom to top, the telescopic leg is retracted, the support falls for a working distance in the direction of the drawing (102). The support A is pulled upwards through the oil cylinder, the top plate 12 and the bottom plate 13 are tightly supported through the support A, the upright post 5 of the support B is properly decompressed, the support A is adopted to pull the support B to move upwards to realize the movement of the support B towards the arrow direction of the display (101), the working face support is integrally moved upwards for a working distance through the method, so that the support is moved towards the arrow direction (103) as a whole, the coal mining of the working face is realized and all coal is mined through the continuous movement of the working face support towards the arrow direction (103), the n-shaped fully-mechanized coal mining hydraulic support of the steeply inclined coal seam is prevented from jumping into the transportation crossheading 10 in the operation process, the phenomenon that the lower support works towards the upper return air crossheading reversing frame is avoided, the labor intensity is effectively reduced, and the operation efficiency is improved. The support moves in the direction (103) on the whole through the comprehensive movement in the two directions, the coal on the working face is extracted completely through the continuous movement of the support on the working face in the direction of the arrow (103), and the support can be effectively prevented from falling into the transportation crossheading 10 and being replaced to the return air crossheading 8 through the method.
Furthermore, the utility model discloses be located working face tunnel 9 and at its inboard ventiduct that forms and transportation crossheading 10 and return air crossheading 8 intercommunication, even working face tunnel 9 carries out the level along with the exploitation and impels, but the utility model discloses do not suffer throughout with the U type ventilation that transportation crossheading 10 and return air crossheading 8 formed, effectively guaranteed the ventilation performance in the exploitation operation, improved operation factor of safety.
Claims (10)
1. The n-shaped fully-mechanized mining hydraulic support is characterized by comprising a top plate side supporting beam positioned on the top plate side, a goaf shielding beam, a goaf hinged beam, a bottom plate side supporting beam positioned on the bottom plate side and a stand column, wherein the goaf shielding beam is hinged with the goaf hinged beam and then faces the goaf, the top plate side supporting beam, the goaf shielding beam, the goaf hinged beam and the bottom plate side supporting beam are hinged to form a support of an n-shaped structure, at least one row of supporting stand columns are arranged between the top plate side supporting beam and the bottom plate side supporting beam, and each row of supporting stand columns comprises two supporting stand columns which are arranged in parallel.
2. The steeply inclined seam n-shaped fully mechanized mining hydraulic support of claim 1, wherein the upper portion of the roof side support beam is hinged with a goaf shield beam, the upper portion of the floor side support beam is hinged with a goaf hinge beam, and the goaf shield beam and the goaf hinge beam are hinged together; at least one row of supporting columns are arranged between the top plate side supporting beam and the bottom plate side supporting beam, one end of each row of supporting columns is connected with the top plate side supporting beam, and the other end of each row of supporting columns is connected with the bottom plate side supporting beam.
3. The fully mechanized hydraulic support for n-shaped mining of a steeply inclined coal seam according to claim 2, wherein a balance jack is further provided between the upper portion of the roof side supporting beam and the gob shield beam, one end of the balance jack is hinged with the roof side supporting beam, and the other end of the balance jack is hinged with the gob shield beam.
4. The fully-mechanized hydraulic support for n-shaped mining of a steeply inclined coal seam according to claim 2, wherein two rows of support pillars are provided between the roof side supporting beam and the floor side supporting beam.
5. The n-shaped fully-mechanized mining hydraulic support for the steeply inclined coal seam according to claim 1, 2, 3 or 4, wherein the goaf hinged beam comprises a first hinged beam and a second hinged beam, two ends of the first hinged beam are hinged with the upper ends of the goaf shield beam and the floor side supporting beam respectively, two ends of the second hinged beam are hinged with the upper portions of the goaf shield beam and the floor side supporting beam respectively, and the first hinged beam, the second hinged beam, the goaf shield beam and the floor side supporting beam together form a four-bar linkage.
6. The fully-mechanized hydraulic support for n-shaped mining of the steeply inclined coal seam according to claim 1, 2, 3 or 4, wherein telescopic legs for lifting the support are arranged at the lower parts of the top plate side supporting beam and the bottom plate side supporting beam, and the telescopic legs are driven to extend and retract by a hydraulic oil cylinder.
7. The fully-mechanized hydraulic support for n-shaped mining of a steeply inclined coal seam according to claim 5, wherein telescopic legs for lifting the support are arranged at the lower parts of the top plate side supporting beam and the bottom plate side supporting beam, and the telescopic legs are driven by a hydraulic oil cylinder to extend and retract.
8. The fully-mechanized mining hydraulic support for the n-shaped steeply inclined coal seam according to claim 1, 2, 3, 4 or 7, characterized by comprising a plurality of fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam, which are arranged along a working face, wherein top plate side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a left-pulling frame oil cylinder, and bottom plate side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a right-pulling frame oil cylinder.
9. The fully-mechanized mining hydraulic support for the n-shaped steeply inclined coal seam according to claim 5, comprising a plurality of fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam, wherein the top plate side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a left-pull frame oil cylinder, and the bottom plate side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a right-pull frame oil cylinder.
10. The fully-mechanized mining hydraulic support for the n-shaped steeply inclined coal seam according to claim 6, comprising a plurality of fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam, which are arranged along the working face, wherein the roof side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a left-pull frame oil cylinder, and the floor side supporting beams of each two adjacent fully-mechanized mining hydraulic supports for the n-shaped steeply inclined coal seam are connected together through a right-pull frame oil cylinder.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112459821A (en) * | 2020-10-27 | 2021-03-09 | 新疆矿源重工科技有限公司 | Horizontal hydraulic support for inclined side of steeply inclined coal seam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459821A (en) * | 2020-10-27 | 2021-03-09 | 新疆矿源重工科技有限公司 | Horizontal hydraulic support for inclined side of steeply inclined coal seam |
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