LU100382B1 - Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method - Google Patents

Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method Download PDF

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Publication number
LU100382B1
LU100382B1 LU100382A LU100382A LU100382B1 LU 100382 B1 LU100382 B1 LU 100382B1 LU 100382 A LU100382 A LU 100382A LU 100382 A LU100382 A LU 100382A LU 100382 B1 LU100382 B1 LU 100382B1
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LU
Luxembourg
Prior art keywords
hydraulic support
coal
soil
bar
top beam
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Application number
LU100382A
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French (fr)
Inventor
Lei Wang
Guangxiang Xie
Chuanqi Zhu
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Univ Anhui Sci & Technology
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Priority to LU100382A priority Critical patent/LU100382B1/en
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Publication of LU100382B1 publication Critical patent/LU100382B1/en

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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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/26—Hydraulic or pneumatic control

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

The invention discloses a hydraulic support for soil-like coal working face and a coal seam mining protection method; the hydraulic support comprises a base, a top beam, a pillar, a driving jack, a face guard and a face guard jack, and further comprises a forepole top beam and a forepole top beam jack, wherein, the forepole top beam is arranged in front of the top beam, extending under the control of the forepole top beam jack, and inserting into the coal wall during the supporting operation. For soil-like coal, the invention provides a work space for the face guard by the forepole top beam to facilitate full opening of the face guard of the hydraulic support and fully exert the guard plate function of the hydraulic support so as to improve the stability of the coal wall.

Description

Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method
Technical Field
The invention relates to a coal mining technology, in particular to a hydraulic support for soil-like coal working face and a coal seam mining protection method.
Background Art
Due to low intensity and poor structure, the soft coal seam forms physical and mechanical features similar to those of loess under specific long-term geological and mechanical conditions. Such broken and loose soil-like coal is called the soil-like coal.
During extraction process at the working face of soil-like coal, the coal wall is likely to go caved and unstable, the stability problem of the coal wall is a serious constraint to safe and efficient mining of soil-like coal seam. During the coal seam extraction, the hydraulic support has key function of supporting, and selection of proper hydraulic support is the premise of controlling coal wall caving and improving coal stability.
For the existing hydraulic support for the loose and soft coal seam working face, a face guard is added, but the new exposed top is likely to fall after coal cutting by the coal mining machine, the fallen coal and rock masses are accumulated in front of the coal wall which narrows the space in front of the hydraulic support, and the face guard is hardly opened, the guarding performance of the support cannot be adequately exerted, the supporting effect is not obvious and the coal stability cannot be maximally improved.
Summary of the Invention
The purpose of the invention is to provide a hydraulic support for soil-like coal working face so as to improve the stability of the coal wall during the mining process.
The other purpose of the invention is to provide a hydraulic support for soil-like coal working face so as to improve the stability of the coal wall during the mining process.
Therefore, the invention provides a hydraulic support for soil-like coal working face; the hydraulic support comprises a base, a top beam, a pillar, a driving jack, a face guard and a face guard jack, and further comprises a forepole top beam and a forepole top beam jack, wherein, the forepole top beam is arranged in front of the top beam, extending under the control of the forepole top beam jack, and inserting into the coal wall during the supporting operation.
Further, the forepole top beam is of a shovel type.
Further, one end of the forepole top beam jack is fixedly connected with the top beam and the other end is fixedly connected with the forepole top beam.
Further, one end of the face guard jack is fixedly connected with the top beam and the other end is fixedly connected with the face guard.
Further, the connecting end of the face guard is hinged with the top beam.
Further, the width of the forepole top beam and the forepole top beam jack is smaller than that of the top beam.
Further, the face guard comprises a face guard body in parallel to the working face during the operation and a connecting rod located on the left and right sides of the forepole top beam jack, wherein, the connecting rod comprises a connecting end hinged with the top beam.
Further, the place of the face guard close to the bottom face of the forepole top beam is provided with an anti-collision face, wherein, an anti-collision space is formed between the face guard and the coal wall during the supporting operation.
Further, the bottom face of the forepole top beam is an inclined face and forms an included angle of 5°-10° with the plane.
According to the other purpose of the invention, it provides a coal seam mining protection method for soil-like coal which uses the hydraulic support for soil-like coal working face described above. The protection method comprises steps of Retracting the forepole top beam and the face guard of the hydraulic support for coal cutting when the roller of the coal mining machine reaches the position of the hydraulic support in cutting the coal wall; retracting the pillar of the hydraulic support after coal cutting, pulling the overall hydraulic support to move forward by the scraper conveyor and the driving jack, and then extending the pillar to support the top beam; extending the forepole top beam jack to insert the forepole top beam into the coal wall, and extending the face guard jack to open the face guard; and pushing the scraper conveyor and the coal mining machine to move forward by the driving jack, and waiting for the next cycle of mining.
Compared with the prior art, the invention has the following benefits: the forepole top beam is designed on the front section of the top beam and above the face guard. Driven by the forepole top beam jack, the forepole top beam can timely extend to support the new exposed roof so as to prevent roof falling, ensure the space between the hydraulic support and the coal wall, provide an available work space for the face guard, facilitate full opening of the face guard of the hydraulic support, fully exert the guide plate function of the hydraulic support and improve the stability of the coal wall.
In addition to the purposes, features and advantages described above, the invention also has other purposes, features and advantages. The invention will be described in further detail with reference to the following drawings.
Brief Description of the Drawings
The drawings of the description forming a part of the application are used for further understanding of the invention. The exemplary embodiments of the invention and description thereof are used to explain the invention, but not improperly limit thereto. In the drawings:
Fig. 1 shows a structural diagram of a hydraulic support for soil-like coal working face based on an embodiment of the invention;
Fig. 2 shows a top structure of a hydraulic support for soil-like coal working face based on an embodiment of the invention; shows a schematic diagram of the hydraulic support for soil-like coal working face in service state of the extraction working face based on based on an embodiment of the invention;
Fig. 4 shows a structural diagram of a face guard of the hydraulic support for soil-like coal working face based on an embodiment of the invention; and
Fig. 5 shows a flow diagram of a coal seam mining protection method for soil-like coal based on an embodiment of the invention.
Reference numbers in drawings I. Forepole top beam; 2. Forepole top beam jack; 3. Face guard; 4. Face guard jack; 5. Top beam; 6. Pillar; 7. Base; 8. Driving jack; 9. Scraper conveyor; 10. Coal mining machine; II. Roller of coal mining machine; 12. Coal wall; 31. Face guard body; 32. Connecting rod; 33. Anti-collision face; la. Top face; lb. Bottom face.
Detailed Description of the Preferred Embodiments
It should be noted that, the embodiments and features thereof in the application can be combined if they are not conflicted. The invention will be described in detail in combination with attached drawings and embodiments.
Fig. 1 to Fig. 4 show some embodiments of the invention.
As shown in Fig. 1 and Fig. 3, a hydraulic support for soil-like coal working face comprises a base 7, a top beam 5, a pillar 6, a driving jack 8, a face guard 3 and a face guard jack 4, and further comprises a forepole top beam 1 and a forepole top beam jack 2, wherein, the forepole top beam 1 is arranged in front of the top beam 5, extending under the control of the forepole top beam jack 2, and inserting into the coal wall during the supporting operation.
Wherein, one end of the forepole top beam jack 2 is fixedly connected with the top beam 5 and the other end is fixedly connected with the forepole top beam 1; the forepole top beam jack 2 can extend and push the face guard jack 1 to move forward; one end of the face guard jack 4 is fixedly connected with the top beam 5 and the other end is fixedly connected with the face guard 3; the face guard jack 4 extends to open the face guard 3, the pillar 6 is arranged between the top beam 5 and the base 7; and the pillar 6 is used to support the top beam 5 and the driving jack 8 is connected with the base 7 .
In the invention, the forepole top beam is designed on the front section of the top beam and above the face guard. Driven by the forepole top beam jack, the forepole top beam can timely extend to support the new exposed roof so as to prevent roof falling, ensure the space between the hydraulic support and the coal wall, provide an available work space for the face guard, facilitate full opening of the face guard of the hydraulic support, maximally exert the guide plate function of the hydraulic support and improve the stability of the coal wall.
In an embodiment, as shown in Fig. 2, the forepole top beam is of a shovel type. Preferably, the top face la of the forepole top beam 1 is a plane and the bottom face lb is an inclined face. The forepole top beam 1 gets narrower and takes the shape of a tip finally along the direction that the forepole top beam 1 extends. More preferably, the oblique angle of the bottom face lb of the forepole top beam is between 5° and 10°, e.g. 6°. In the embodiment, the shape of the forepole top beam is suitable for being inserted into the coal seam, the applied force is small and only small local bulge or dregs are formed on the coal wall.
In an embodiment as shown in Fig. 1 and Fig. 4, the top of the face guard 3 is an anti-collision face 33 at the work place of the face guard, and the anti-collision face 33 leans outward in relative to the vertical working face of the coal wall to form an anti-collision space. In this embodiment, the provision of the anti-collision face facilitates smooth opening of the face guard. Meanwhile, the anti-collision face 33 matches with the bottom face (inclined plane) of the forepole top beam 1 in terms of function to avoid local bulge of the coal wall and achieve better support effect.
In an embodiment, as shown in Fig. 2, the forepole top beam 1 gets narrower and takes the shape of a tip finally along the direction that the forepole top beam extends. In this embodiment, the resistance to insertion of the forepole top beam can be further reduced.
In an embodiment, the width of the forepole top beam 1 and the forepole top beam jack 2 is smaller than that of the top beam. In the embodiment, both sides of the forepole top beam jack can be arranged with a connecting rod for connecting the face guard within the width range of the top beam.
In an embodiment, as shown in Fig. 4, the face guard 3 comprises a face guard body 31 in parallel to the working face during the operation and a connecting rod 32 located on the left and right sides of the forepole top beam jack, wherein, the connecting end of the connecting rod 32 is hinged with the top beam 5. In this embodiment, the space on both sides of the forepole top beam jack is effectively and reasonably used. In a variant embodiment, the connecting rod 32 is fixedly connected with the top beam 5, and the face guard body 31 is hinged with the connecting rod 32. In this variant embodiment, the connecting rod 32 is a fixed part and the forepole top beam is located between the connecting rods on both sides which can protect the forepole top beam when it is retracted.
As shown in Fig. 5, the coal seam mining protection method for soil-like coal comprises the following steps of: S 11: Retracting the forepole top beam and the face guard of the hydraulic support for coal cutting when the roller of the coal mining machine reaches the position of the hydraulic support in cutting the coal wall; S13: retracting the pillar of the hydraulic support after coal cutting, pulling the overall hydraulic support to move forward by the scraper conveyor and the driving jack, and then extending the pillar to support the top beam; S15: extending the forepole top beam jack to insert the forepole top beam into the coal wall, and extending the face guard jack to open the face guard; and SI7: pushing the scraper conveyor and the coal mining machine to move forward by the driving jack, and waiting for the next cycle of mining.
After coal cutting of the roller 11 of the coal mining machine, the pillar 6 is retracted, the scraper conveyor 9 and the driving jack 8 are used for dragging the overall support to move forwards and the new exposed roof is timely supported; the pillar 6 subsequently rises and the top beam 5 is supported, the face guard jack 4 extends to facilitate the forepole top beam inserting into the coal wall, then the face guard 3 is opened to fully isolate the new exposed roof and prevent roof falling; finally, the scraper conveyor 9 and the coal mining machine 10 are pushed to move forwards by the driving jack 8, so as to complete one coal mining and supporting process.
The invention makes full use of the shoring function of the hydraulic support to prevent accidents such as “caving, falling and leakage” endangering safe production and occurred during the mining process, so as to realize the safe and effective mining at the working face of soil-like coal.
The above embodiments are only preferred embodiments of the invention, but not limit thereto. For a person skilled in the art, various variations and changes can be made to the invention. Any modifications, equivalent substitutions, improvements and the like within the spirit and principles of the invention shall fall within the protection scope of the invention.

Claims (10)

1. Support hydraulique pour une surface de travail de charbon en forme de sol, comprenant une base (7), une barre supérieure (5), un pilier (6), un vérin d'entraînement (8), une protection de surface (3) et un vérin de protection de surface (4), et caractérisé en ce qu'il comprend en outre une barre supérieure avant (1) et un vérin de barre supérieure avant (2), dans lequel, la barre supérieure avant (1) est disposée devant la barre supérieure (5), s'étendant lors la commande du vérin de barre supérieure avant (2), et s'insérant dans la paroi de charbon pendant l'opération de support.A hydraulic support for a soil-like coal working surface, comprising a base (7), an upper bar (5), a pillar (6), a drive cylinder (8), a surface protection ( 3) and a surface protection cylinder (4), and characterized in that it further comprises a front upper bar (1) and a front upper bar cylinder (2), wherein, the upper front bar (1) ) is arranged in front of the upper bar (5), extending during the control of the upper front bar cylinder (2), and inserting into the carbon wall during the support operation. 2. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce que la barre supérieure avant (1) est de type pelle.2. Hydraulic support for a soil-shaped coal working surface according to claim 1, characterized in that the upper front bar (1) is of the excavator type. 3. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce qu'une extrémité du vérin de barre supérieure avant (2) est fixée à la barre supérieure (5) et l'autre extrémité est fixée à la barre supérieure avant (1).Hydraulic support for a floor-shaped coal work surface according to claim 1, characterized in that one end of the upper front bar cylinder (2) is fixed to the upper bar (5) and the other end is attached to the front upper bar (1). 4. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce qu'une extrémité du vérin de protection de surface (4) est fixée à la barre supérieure (5) et l'autre extrémité est fixée à la protection de surface (3).Hydraulic support for a soil-shaped coal working surface according to claim 1, characterized in that one end of the surface protection cylinder (4) is fixed to the upper bar (5) and the other end is attached to the surface protection (3). 5. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce qu'une extrémité de connexion de la protection de surface (3) est articulée avec la barre supérieure (5).5. Hydraulic support for a soil-shaped coal working surface according to claim 1, characterized in that a connecting end of the surface protection (3) is articulated with the upper bar (5). 6. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce que la largeur de la barre supérieure avant (1) et du vérin de barre supérieure avant (2) est inférieure à celle de la barre supérieure (5).Hydraulic support for a soil-shaped coal working surface according to claim 1, characterized in that the width of the upper front bar (1) and the upper front bar cylinder (2) is smaller than that of the upper bar (5). 7. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 6, caractérisé en ce que la protection de surface (3) comprend un corps de protection de surface (31) parallèle à la paroi de charbon pendant l’opération de support et une bielle (32) située sur les côtés gauche et droit du vérin de barre supérieure avant (2), dans lequel la bielle (32) comprend une extrémité de liaison articulée avec la barre supérieure (5).Hydraulic support for a soil-shaped coal working surface according to claim 6, characterized in that the surface protection (3) comprises a surface protection body (31) parallel to the carbon wall during the period of time. support operation and a connecting rod (32) located on the left and right sides of the upper front rod cylinder (2), wherein the connecting rod (32) comprises a connecting end articulated with the upper bar (5). 8. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 1, caractérisé en ce que l'emplacement de la protection de surface (3) près de la surface inférieure de la barre supérieure avant (1) est pourvu d'une surface anti-collision (33), dans lequel un espace anti-collision est formé entre la protection de surface (3) et la paroi du charbon (12) pendant l'opération de support.Hydraulic support for a soil-shaped coal working surface according to claim 1, characterized in that the location of the surface protection (3) near the lower surface of the upper front bar (1) is provided an anti-collision surface (33), wherein an anti-collision space is formed between the surface protection (3) and the wall of the carbon (12) during the support operation. 9. Support hydraulique pour une surface de travail de charbon en forme de sol selon la revendication 8, caractérisé en ce que la surface inférieure (lb) de la barre supérieure avant (1) est une surface inclinée et forme un angle inclus de valeur comprise entre 5° et 10° par rapport au plan.9. Hydraulic support for a soil-shaped coal working surface according to claim 8, characterized in that the lower surface (1b) of the upper front bar (1) is an inclined surface and forms an included angle of value inclusive. between 5 ° and 10 ° with respect to the plane. 10. Procédé de protection de mines de gisement de charbon en forme de sol, caractérisé par l'utilisation du support hydraulique pour une surface de travail de charbon en forme de sol selon l'une quelconque des revendications 1 à 9, le procédé de protection comprenant les étapes suivantes : Étape 1 : rétracter la barre supérieure avant (1) et la protection de surface (3) du support hydraulique pour la découpe du charbon lorsque le rouleau de la machine d'extraction du charbon (11) atteint la position du support hydraulique lors de la coupe de la paroi de charbon ; Étape 2 : rétracter le pilier (6) du support hydraulique après la coupe du charbon, tirer le support hydraulique global pour avancer par le convoyeur racleur (9) et le vérin d'entraînement (8), puis étendre le pilier (6) pour supporter la barre supérieure (5) ; Étape 3 : prolonger le vérin de barre supérieure avant (2) pour insérer la barre supérieure avant (1) dans la paroi de charbon (12), et étendre le vérin de protection de surface (4) pour ouvrir la protection de surface (3) ; et Étape 4 : pousser le convoyeur racleur (9) et la machine d'extraction du charbon (10) pour avancer par le vérin d'entraînement (8), et attendre le cycle suivant d'exploitation minière.A method of protecting coal mines in the form of a soil, characterized by using the hydraulic support for a soil-shaped coal working surface according to any one of claims 1 to 9, the method of protection comprising the following steps: Step 1: Retract the front upper bar (1) and the surface protection (3) from the hydraulic support for cutting the coal when the roll of the coal extraction machine (11) reaches the position of the hydraulic support when cutting the coal wall; Step 2: Retract the pillar (6) from the hydraulic support after cutting the coal, pull the overall hydraulic support to advance through the scraper conveyor (9) and the drive cylinder (8), then extend the pillar (6) to support the upper bar (5); Step 3: Extend the upper front rod cylinder (2) to insert the upper front bar (1) into the carbon wall (12), and extend the surface protection cylinder (4) to open the surface protection (3). ); and Step 4: Push the scraper conveyor (9) and the coal extraction machine (10) to advance through the drive cylinder (8), and wait for the next mining cycle.
LU100382A 2016-11-24 2016-11-24 Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method LU100382B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
LU100382A LU100382B1 (en) 2016-11-24 2016-11-24 Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU100382A LU100382B1 (en) 2016-11-24 2016-11-24 Hydraulic Support for Soil-like Coal Working Face and Coal Seam Mining Protection Method

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LU100382B1 true LU100382B1 (en) 2017-12-05

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Effective date: 20171205