LU100383B1 - Hydraulic Support and Control Method Thereof - Google Patents

Hydraulic Support and Control Method Thereof Download PDF

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Publication number
LU100383B1
LU100383B1 LU100383A LU100383A LU100383B1 LU 100383 B1 LU100383 B1 LU 100383B1 LU 100383 A LU100383 A LU 100383A LU 100383 A LU100383 A LU 100383A LU 100383 B1 LU100383 B1 LU 100383B1
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LU
Luxembourg
Prior art keywords
depressurization
pillar
depressurizing
hydraulic support
top beam
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LU100383A
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French (fr)
Inventor
Guangxiang Xie
Chuanqi Zhu
Lei Wang
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Univ Anhui Sci & Technology
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Priority to LU100383A priority Critical patent/LU100383B1/en
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Publication of LU100383B1 publication Critical patent/LU100383B1/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)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses a hydraulic support and a control method thereof; the hydraulic support comprises a base, a top beam, a driving jack, a face guard, a face guard jack and pillars comprising a front pillar and a rear pillar, and further comprises a forepole top beam, a forepole top beam jack, a front depressurizing device and a rear depressurizing device; 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; the front pillar is communicated with an emulsion tank through the front depressurizing device, the rear pillar is communicated with the emulsion tank through the rear depressurizing device, the front depressurizing device and the rear depressurizing device can conduct depressurization independently, and both of them are staged depressurizing devices. 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 and Control Method Thereof
Technical Field
The invention relates to a coal mining technology, in particular to a hydraulic support for soil-like coal working face and control method thereof 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.
After some coal is extracted, the stress of the surrounding rock of the working face is re-distributed, and partial stress originally acting on the surrounding rock of the working face is transferred to the hydraulic support. If high pressure acting on the support cannot be timely released, the support will be driven into the seam floor or even fully crushed, resulting in stagnant propulsion of the working face and serious impact on production.
At present, support crushing is often prevented by improving the loading capacity of the hydraulic support. Such method requires high performance of the hydraulic support and results in high cost, and it still cannot completely eliminate the support crushing accident.
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; it can timely and actively conduct depressurization to prevent support crushing when the roof delivers a high pressure.
Another purpose of the invention is to provide a hydraulic support control method which can timely and actively depressurize to prevent support crushing when the roof delivers a high pressure.
Another purpose of the invention is to provide a coal seam mining protection method for soil-like coal so as to improve the stability of the coal wall during the mining process.
Therefore, the invention provides a hydraulic support, comprising a base, a top beam, a driving jack, a face guard, a face guard jack and a pillar; the pillar is arranged between the top beam and the base, comprising a front pillar and a rear pillar, characterized by comprising a forepole top beam, a forepole top beam jack, a front depressurizing device arranged on the front pillar and a rear depressurizing device arranged on the rear pillar; 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; the front pillar is communicated with an emulsion tank through the front depressurizing device, the rear pillar is communicated with the emulsion tank through the rear depressurizing device, the front depressurizing device and the rear depressurizing device can conduct depressurization independently, and both of them are staged depressurizing devices .
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 connected with the top beam, and the other end is 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 both sides of the forepole top beam jack; the connecting rod comprises a connecting end hinged with the top beam.
Further, the place of the face guard close to the bottom surface of the forepole top beam is provided with an anti-collision face; and an anti-collision space is formed between the face guard and the coal wall during the supporting operation.
Further, the bottom surface of the forepole top beam is an inclined surface and forms an angle of 5°-10° with the plane.
Further, the front depressurizing device is a three-stage depressurizing device, comprising a first sequence valve, a second sequence valve and a third sequence valve orderly connected in series on a main depressurizing oil line, characterized by further comprising a first depressurizing valve in communication with the main depressurizing oil line behind the first sequence valve, a second depressurizing valve in communication with the main depressurizing oil line behind the second sequence valve and a third depressurizing valve in communication with the main depressurizing oil line behind the third sequence valve; the opening pressure of the first sequence valve is equal to 0.80-0.85 times of the loading capacity of the hydraulic pillar, the opening pressure of the second sequence valve is equal to 1.0-1.05 times of the loading capacity of the hydraulic pillar, the opening pressure of the third sequence valve is equal to 1.3-1.35 times of the loading capacity of the hydraulic pillar, and the opening pressure of the first depressurizing valve, the second depressurizing valve and the third depressurizing valve is 0.1 -0.3 times of the loading capacity of the hydraulic pillar.
According to another purpose of the invention, it provides a hydraulic support control method by which the front depressurizing device and the rear depressurizing device can conduct depressurization independently, and further conduct staged depressurization based on the pressure from the roof, and staged unloading is automatically realized by the front depressurizing device and/or the rear depressurizing device when the pressure is delivered by the roof, thereby lowering the front and/or rear part of the top beam to prevent support crushing.
Further, the front depressurizing device is to conduct three-stage depressurization based on the roof pressure, the first-stage depressurization is performed when the pressure reaches 0.80-0.85 times of the loading capacity, the second-stage depressurization is performed when the pressure reaches 1.0-1.05 times of the loading capacity after the first-stage pressure relief, and the third-stage depressurization is performed when the pressure reaches 1.3-1.35 times of the loading capacity after the second-stage depressurization.
According to another 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:
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, fully exert the face guard function of the hydraulic support and improve the stability of the coal wall.
In the invention, the front end and/or rear end of the top beam can independently lower down when the pressure is delivered from the roof, and staged depressurization can be realized based on the roof pressure for depressurizing and buffering, and thereby preventing the support inclining and support crushing.
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 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;
Fig. 3 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;
Fig. 5 shows a flow diagram of a coal seam mining protection method for soil-like coal based on an embodiment of the invention;
Fig. 6 shows a schematic diagram of a three-stage depressurizing device based on the hydraulic support of staged depressurization of the invention.
Reference numbers in drawings 1. 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; 11. Roller of coal mining machine; 12. Coal wall; 13. Caving shield; 14. Tail beam; 31. Face guard body; 32. Connecting rod; 33. Anti-collision face; la. Top face; lb. Bottom face; 61 Depressurizing valve; 62. Early warning device; 15. Goaf; 16 Coal seam roof; 17 Coal seam floor 20. Depressurizing device; 21. First sequence valve; 22. Second sequence valve; 23. Third sequence valve; 24. First depressurizing valve; 25. Second depressurizing valve; 26. Third depressurizing valve.
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. The pillar is arranged between the top beam and the base, comprising a front pillar and a rear pillar. The hydraulic support further comprises a forepole top beam 1, a forepole top beam jack 2, a front depressurizing device arranged on the front pillar and a rear depressurizing device arranged on the rear pillar; 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. The front pillar is communicated with an emulsion tank through the front depressurizing device, the rear pillar is communicated with the emulsion tank through the rear depressurizing device, and the front depressurizing device and the rear depressurizing device can conduct depressurization independently, and both of them are staged depressurizing devices .
One end of the forepole top beam jack 2 is connected with the top beam 5, the other end is connected with the forepole top beam 1, the forepole top beam jack 2 extends to push the forepole top beam 1 forwards; one end of the face guard jack 4 is connected with the top beam 5, the other end is 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, 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 face guard 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 1 is of a shovel type. Preferably, the top face la of the forepole top beam 1 is a plane; 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 5°-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 both sides of the forepole top beam jack; wherein, the connecting end of the connecting rod 32 is hinged with the top beam 5. In the embodiment, the space on both sides of the forepole top beam jack is effectively and properly utilized. In a variant embodiment, the connecting 32 is fixedly connected with the top beam 5, and the face guard body 31 is hinged with the connecting rod 32. In the 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.
In an embodiment, the front depressurizing device is to conduct three-stage depressurization based on the roof pressure, the first-stage depressurization is performed when the pressure reaches 0.80-0.85 times of the loading capacity, the second-stage depressurization is performed when the pressure reaches 1.0-1.05 times of the loading capacity after the first-stage pressure relief, and the third-stage depressurization is performed when the pressure reaches 1.3-1.35 times of the loading capacity after the second-stage depressurization.
In the embodiment, the relationship of magnitude between the pressure from the roof and the loading capacity of the pillar can be used for controlling the staged depressurization, and the first-stage depressurization occurs to perform buffering and depressurizing functions when the loading capacity (i.e., loading capacity of 0.8-0.85, which exceeds the normal supporting pressure range of the pillar and is generally limited below 0.7 times of the loading capacity) of the pillar is not reached.
In an embodiment, as shown in Fig. 6, the front depressurizing device or the rear depressurizing device comprises a first sequence valve, a second sequence valve and a third sequence valve orderly connected in series on a main depressurizing oil line, characterized by further comprising a first depressurizing valve in communication with the main depressurizing oil line behind the first sequence valve, a second depressurizing valve in communication with the main depressurizing oil line behind the second sequence valve and a third depressurizing valve in communication with the main depressurizing oil line behind the third sequence valve; wherein, the opening pressure of the first sequence valve is equal to 0.80-0.85 times of the loading capacity of the hydraulic pillar, the opening pressure of the second sequence valve is equal to 1.0-1.05 times of the loading capacity of the hydraulic pillar, the opening pressure of the third sequence valve is equal to 1.3-1.35 times of the loading capacity of the hydraulic pillar, and the opening pressure of the first depressurizing valve, the second depressurizing valve and the third depressurizing valve is 0.1-0.3 times of the loading capacity of the hydraulic pillar.
In the embodiment, a three-stage unloading device can automatically conduct staged depressurization. The operation pressure of each depressurizing valve is low and the depressurization is reliable. The higher the roof pressure is, the more the depressurizing valves open and the higher the unloading amount is. With fast unloading reaction, it can avoid support crushing and pressed implosion to a certain extent (for example, when not exceeding 3 times of the loading capacity).Compared with the prior art, no additional small unloading hole should be arranged on the cylinder wall, and compared with the two-stage unloading process, it can reliably unload. In a hydraulic support, the opening pressure of the first sequence valve is 35MPa, the opening pressure of the second sequence valve is 40MPa and the third sequence valve is 45MPa.
In an embodiment, the three-stage depressurizing device is an integral hydraulic valve comprising an inlet P and a return port T, which simplifies the connection and installation of pipelines.
In a variant of the embodiments shown in Fig. 6, the two-stage unloading process is adopted, the first sequence valve and the second depressurizing valve are omitted, and the unloading pressure is the same.
In an embodiment, the front support pillar is a three-stage depressurizing device and the rear support pillar is a two-stage depressurizing device.
The control method of the hydraulic support of the invention is described in detail in combination with Fig. 3.
After coal cutting of the roller of the coal mining machine, the pillar is retracted, the scraper conveyor and the driving jack are used for dragging the overall support to move forwards and a new exposed roof is timely supported; the pillar subsequently rises and the top beam is supported, the scraper conveyor and the coal mining machine are pushed to move forwards by the driving jack, so as to complete one coal mining and supporting process. When the pressure from the roof is high and exceeds 35MPa, the first sequence valve and the first depressurizing valve with a threshold of 35MPa will actively open to reduce the pressure of emulsion, timely depressurize, retract the pillar, lower the support to prevent support crushing and deliver an early warning to remind the operators of taking countermeasures. After the depressurizing valve is opened, the space expansion of the emulsion cavity is small and the pressure reduction valve of the emulsion is confined, but the support has high supporting force and the working face can be normally used for extraction. When the pressure from the roof is higher, the second pressure valve corresponding to the second sequence valve with a threshold of 40MPa or the third depressurizing valve corresponding to the third sequence valve with a threshold of 45MPa is opened, the pillar is further used for depressurization and can timely protect the hydraulic support.
As shown in Fig. 5, the coal seam mining protection method for soil-like coal comprises the steps of:
Sil, 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; SI3, 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; SI5, extending the forepole top beam jack to insert the forepole top beam into the coal wall, and extending the guard plate jack to open the guard plate; 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 (6)

1. Support hydraulique comprenant une base (7), une barre supérieure (5), un vérin d'entraînement (8), une protection de surface (3), un vérin de protection de surface (4) et un pilier (6), le pilier (6) étant disposé entre la barre supérieure (5) et la base (7), comprenant un pilier avant et un pilier arrière, caractérisé en ce qu'il comprend en outre une barre supérieure avant (1), un vérin de barre supérieure avant (2), un dispositif de dépressurisation avant (20) disposé sur le pilier avant et un dispositif de dépressurisation arrière disposé sur le pilier arrière, dans lequel la barre supérieure avant (1) est disposée en face de la barre supérieure (5), s'étendant sous la commande du vérin de barre supérieure avant (2) et s'insérant dans la paroi de charbon (12) pendant l'opération de support ; le pilier avant est en communication avec un réservoir à émulsion par l'intermédiaire du dispositif de dépressurisation avant (20), le pilier arrière est en communication avec le réservoir à émulsion par l'intermédiaire du dispositif de dépressurisation arrière, le dispositif de dépressurisation avant et le dispositif de dépressurisation arrière effectuent indépendamment une dépressurisation, et les deux sont des dispositifs de dépressurisation par étapes.1. Hydraulic support comprising a base (7), an upper bar (5), a drive cylinder (8), a surface protection (3), a surface protection cylinder (4) and a pillar (6) , the pillar (6) being disposed between the upper bar (5) and the base (7), comprising a front pillar and a rear pillar, characterized in that it further comprises a front upper bar (1), a jack upper front bar (2), a front depressurization device (20) disposed on the front pillar and a rear depressurization device disposed on the rear pillar, wherein the front upper bar (1) is disposed opposite the upper bar (5) extending under the control of the upper front rod cylinder (2) and fitting into the carbon wall (12) during the support operation; the front pillar is in communication with an emulsion tank via the front depressurization device (20), the rear pillar is in communication with the emulsion tank via the rear depressurizing device, the front depressurizing device and the rear depressurizing device independently performs depressurization, and both are step depressurization devices. 2. Support hydraulique selon la revendication 1, caractérisé en ce que le dispositif de dépressurisation avant (20) est un dispositif de dépressurisation à trois étapes, comprenant une première soupape de séquence (21), une deuxième soupape de séquence (22) et une troisième soupape de séquence (23) lesquelles sont connectées en série sur une ligne d'huile de dépressurisation principale, et comprenant en outre une première soupape de dépressurisation (24) reliée à la ligne d'huile de dépressurisation principale derrière la première soupape de séquence (21), une deuxième soupape de dépressurisation (25) reliée à la ligne d'huile de dépressurisation principale derrière la deuxième soupape de séquence (22) et une troisième soupape de dépressurisation (26) reliée à la ligne d'huile de dépressurisation principale derrière la troisième soupape de séquence (23) ; dans lequel la pression d'ouverture de la première soupape de séquence (21) est égale à 0,80 à 0,85 fois la capacité de chargement du pilier hydraulique, la pression d'ouverture de la deuxième soupape de séquence (22) est égale à 1,0 à 1,05 fois la capacité de chargement du pilier hydraulique, et la pression d'ouverture de la troisième soupape de séquence (23) est égale à 1,3 à 1,35 fois la capacité de chargement du pilier hydraulique, et la pression d'ouverture de la première soupape de dépressurisation (24), de la deuxième soupape de dépressurisation (25) et de la troisième soupape de dépressurisation (26) est de 0,1 à 0,3 fois la capacité de chargement du pilier hydraulique.Hydraulic support according to claim 1, characterized in that the front depressurizing device (20) is a three-stage depressurization device, comprising a first sequence valve (21), a second sequence valve (22) and a third sequence valve (23) which are connected in series on a main depressurizing oil line, and further comprising a first depressurization valve (24) connected to the main depressurizing oil line behind the first sequence valve (21), a second depressurizing valve (25) connected to the main depressurizing oil line behind the second sequence valve (22) and a third depressurizing valve (26) connected to the main depressurizing oil line behind the third sequence valve (23); wherein the opening pressure of the first sequence valve (21) is 0.80 to 0.85 times the loading capacity of the hydraulic pillar, the opening pressure of the second sequence valve (22) is equal to 1.0 to 1.05 times the loading capacity of the hydraulic pillar, and the opening pressure of the third sequence valve (23) is equal to 1.3 to 1.35 times the loading capacity of the pillar and the opening pressure of the first depressurization valve (24), the second depressurization valve (25) and the third depressurization valve (26) is 0.1 to 0.3 times the loading of the hydraulic pillar. 3. Support hydraulique selon la revendication 1, caractérisé en ce que la protection de surface (3) comprend un corps de protection de surface (31) parallèle à la paroi de charbon (12) 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).3. Hydraulic support according to claim 1, characterized in that the surface protection (3) comprises a surface protection body (31) parallel to the carbon wall (12) during the 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). 4. Support hydraulique selon la revendication 2, caractérisé en ce que le dispositif de dépressurisation avant (20) et le dispositif de dépressurisation arrière peuvent effectuer indépendamment une dépressurisation, et effectuer en outre une dépressurisation par étapes, en fonction de la pression du toit, et le déchargement par étapes est automatiquement réalisé par le dispositif de dépressurisation avant (20) et/ou le dispositif de dépressurisation arrière lorsqu'une pression est exercée par le toit, et abaissant ainsi la partie avant et/ou arrière de la barre supérieure (5) pour empêcher l'écrasement du support.4. Hydraulic support according to claim 2, characterized in that the front depressurization device (20) and the rear depressurizing device can independently perform a depressurization, and further perform a step depressurization, depending on the roof pressure, and the step unloading is automatically performed by the front depressurizing device (20) and / or the rear depressurizing device when pressure is exerted by the roof, and thereby lowering the front and / or rear portion of the upper bar ( 5) to prevent crushing of the media. 5. Support hydraulique selon la revendication 4, caractérisé en ce que le dispositif de dépressurisation avant (20) est agencé pour effectuer une dépressurisation à trois étapes en fonction de la pression de toit, la dépressurisation de la première étape est effectuée lorsque la pression atteint 0,80 à 0,85 fois la capacité de chargement, la dépressurisation de la deuxième étape est effectuée lorsque la pression atteint 1,0 à 1,05 fois la capacité de chargement après la dépressurisation de la première étape, et la dépressurisation de la troisième étape est effectuée lorsque la pression atteint 1,3 à 1,35 fois la capacité de chargement après la dépressurisation de la deuxième étape.5. Hydraulic support according to claim 4, characterized in that the front depressurization device (20) is arranged to perform a three-stage depressurization depending on the roof pressure, the depressurization of the first stage is performed when the pressure reaches 0.80 to 0.85 times the loading capacity, the depressurization of the second stage is carried out when the pressure reaches 1.0 to 1.05 times the loading capacity after the depressurization of the first stage, and the depressurization of the third step is performed when the pressure reaches 1.3 to 1.35 times the loading capacity after the depressurization of the second stage. 6. Procédé de protection de mines de gisement de charbon en forme de sol, caractérisé par l'utilisation du support hydraulique selon l'une quelconque des revendications 1 à 3, 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 according to any one of claims 1 to 3, the protection method comprising the following steps: Step 1: Retract the bar upper front (1) and the surface protection (3) of the hydraulic support for cutting the coal when the roller 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 by 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.
LU100383A 2016-11-25 2016-11-25 Hydraulic Support and Control Method Thereof LU100383B1 (en)

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