Device for improving initial supporting force of hydraulic support

Abstract

The utility model provides a device for improving the initial supporting force of a hydraulic support, which is mainly applied to a plurality of hydraulic supports for supporting mine ground pressure generated by an overlying rock stratum in mining operation of a fully mechanized coal mining face of a coal mine, each hydraulic support comprises a hydraulic stand column, and the hydraulic stand columns comprise high-pressure liquid. According to the specific structure, a connecting pipe is arranged between the two adjacent hydraulic supports, the connecting pipe is used for connecting the hydraulic stand columns in the two adjacent hydraulic supports, an operating valve is arranged on the connecting pipe, and the operating valve can control opening and closing of the connecting pipe. According to the device for improving the initial supporting force of the hydraulic support, the initial supporting force of other hydraulic supports can be improved through high-pressure liquid energy converted from mine ground pressure in the hydraulic stand column in the hydraulic support before liquid drainage and frame descending.

Description

Technical Field

[0001] The present invention relates to the field of mine hydraulic support equipment, and particularly to a device for improving the initial support force of a hydraulic support. Background Art

[0002] In 2023, China produced 4.66 billion tons of coal, about 80% of which was mined by underground methods. The coal mined by underground methods is mainly produced by fully mechanized coal mining methods composed of hydraulic supports, shearer loaders, scraper conveyors, etc. The length of a fully mechanized coal mining face is generally 250 m, and currently the longest reaches 450 m. More than 100 - 200 sets of hydraulic supports provide support for the roof.

[0003] To ensure the requirements of the shearer coal cutting process, it is necessary to complete the processes of raising, lowering, and forward movement (shifting) of the hydraulic support, retracting and opening of the side guard plate and the rib protection plate, and forward movement (pushing the scraper conveyor) of the scraper conveyor. These processes are realized by the hydraulic supply and return liquid system. This system generally mainly consists of a hydraulic (fluid) tank, a high-pressure forced-feed hydraulic pump, a main supply pipe, a column, valves (various types of operating valves, check valves, safety valves, etc.), jacks, cylinders, a main return pipe, etc. The system is semi-closed, that is, the suction of the liquid on the supply side and the discharge of the liquid on the return side are both completed in the liquid tank under normal pressure. During coal cutting, the hydraulic pump is always in operation. For each coal mining cycle completed, the columns, jacks, cylinders, etc. of the hydraulic support need to be supplied with liquid and drained once; as the column drains liquid and the support descends, the high-pressure liquid in the column flows into the return pipeline, and the high-pressure liquid can be wasted in vain. The support force of the hydraulic support, that is, the pressure of the liquid in the hydraulic column, is the largest before draining liquid and descending the support, and the initial support force after raising the support by the incoming liquid provided by the pump station is the smallest.

[0004] The overlying strata in the stope (mine pressure) act on the hydraulic support in the form of external loads, mainly supported by the columns of the support, manifested as an increase in the liquid pressure in the columns; the fully mechanized hydraulic support aims to control the direct roof and the basic roof from separating, and at the same time be able to balance the impact generated by the periodic breaking of the basic roof on the hydraulic support to ensure the safety of the stope. The initial support force provided by the hydraulic pump station is the active support for the working face roof, aiming to prevent early separation and subsidence of the roof, thereby maintaining the stability of the overlying strata structure and weakening the roof impact load. Generally speaking, as the initial support force increases, the roof subsidence amount and subsidence speed decrease significantly and tend to be stable; the greater the mining height, the more complete the natural state of the direct roof, and the more urgent the need for a greater initial support force. Utility Model Content

[0005] The present application provides a device for increasing the initial support force of hydraulic supports, which is mainly applied to multiple hydraulic supports used to support the mine pressure generated by overlying strata in the mining operation of fully mechanized coal mining faces. Each of the hydraulic supports includes a hydraulic column, and the hydraulic column contains high-pressure liquid. Its specific structure is as follows: A connecting pipe is arranged between the two hydraulic supports, and the connecting pipe is used to connect the hydraulic columns in two adjacent hydraulic supports. A control valve is arranged on the connecting pipe, and the control valve can control the opening and closing of the connecting pipe. Before the second hydraulic support drains liquid and lowers the support, the control valve on the connecting pipe connecting it to the first hydraulic support that has completed the support by lifting adjacent to it is opened. The high-pressure liquid in the hydraulic column of the second hydraulic support with higher pressure enters the hydraulic column of the first hydraulic support to increase the initial support force of the first hydraulic support. When the support force of the first hydraulic support reaches the design pressure or is equal to the pressure of the second hydraulic support, the control valve is closed, and the second hydraulic support continues to drain liquid and lower the support.

[0006] With the above specific structure, the high-pressure liquid in the hydraulic column can enter other hydraulic columns before draining liquid and lowering the support, which can increase the initial support force of other hydraulic columns; a higher initial support force can better control the separation layer between the immediate roof and the main roof from occurring, and at the same time can better balance the impact on the support caused by the periodic fracture of the main roof, thereby better ensuring the safety of the stope.

[0007] As a possible implementation, the multiple hydraulic supports further include a third hydraulic support, a fourth hydraulic support, a fifth hydraulic support, etc., and are sequentially connected through the connecting pipe.

[0008] As a possible implementation, the high-pressure liquid in the hydraulic column is emulsion liquid.

[0009] As a possible implementation, the connecting pipe is a high-pressure rubber hose.

[0010] As a possible implementation, the control valve is a two-way control valve. Description of the Drawings

[0011] The following further illustrates each technical feature of the present application and the relationships between them with reference to the drawings. The drawings are exemplary. Some technical features are not shown in actual proportion, and some drawings may omit technical features that are customary in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or may additionally show technical features that are not essential for understanding and implementing the present application. That is to say, the combination of the technical features shown in the drawings is not used to limit the present application. In addition, throughout the present application, the content referred to by the same reference numerals is also the same. The specific description of the drawings is as follows:

[0012] Figure 1 Schematic diagram of the layout of fully-mechanized hydraulic supports and the hydraulic system involved in the embodiments of this application;

[0013] Figure 2 Schematic connection diagram of the device for increasing the initial support force of hydraulic supports involved in the embodiments of this application;

[0014] Figure 3 Schematic diagram of the method steps for increasing the initial support force of hydraulic supports involved in the embodiments of this application;

[0015] Figure 4 Schematic diagram of the movement of hydraulic supports during mine operations involved in this application;

[0016] Figure 5 Schematic diagram of the structure of the hydraulic support involved in the embodiments of this application.

[0017] Explanation of reference numerals: 1 - hydraulic support; 2 - floor; 3 - coal body; 4 - working face; 5 - immediate roof; 6 - main roof; 10 - hydraulic column; 20 - shielding beam and rib protection plate; 30 - roof beam; 40 - front beam; 50 - base; 60 - jack for pushing; 200 - main inlet pipe; 300 - main return pipe; 400 - emulsion pump station; 500 - emulsion tank; 600 - connecting pipe; 610 - control valve. Detailed implementation manners

[0018] First, a brief introduction to the fully-mechanized coal mining operation involved in this application is given with reference to the accompanying drawings.

[0019] Among them, as Figure 4 shown, the hydraulic support 1 is a device for supporting the mining operation area during the fully-mechanized coal mining face. Usually, multiple hydraulic supports 1 are used simultaneously to support the immediate roof 5, thereby providing a safe working space between the immediate roof 5 and the floor 2 and in the working face area.

[0020] Among them, as Figure 5 shown, the hydraulic support 1 includes a base 50, on which a hydraulic column 10, a shielding beam and rib protection plate 20, a roof beam 30 and a front beam 40 are provided. Among them, the shielding beam and rib protection plate 20, the roof beam 30 and the front beam 40 provide support for the immediate roof 5, and the hydraulic column 10 is used to provide support force for the above three. And a safety valve is provided on the hydraulic column 10 to prevent the pressure in the hydraulic column 10 from being too high, so as to avoid damage to the equipment and potential accident hazards.

[0021] Among them, as the coal body 3 is mined, the working face 4 will move forward. The hydraulic support 1 is equipped with a jack for pushing 60 for pulling the hydraulic support 1 to move. The jack for pushing 60 can pull the hydraulic support 1 to move along with the working face 4.

[0022] Before the hydraulic support 1 moves, the hydraulic columns 10 need to drain the liquid to lower the support, and the high-pressure liquid is discharged through the main return pipe 300. After the hydraulic support 1 is moved to the preset position, the high-pressure liquid is then injected into the hydraulic columns 10 through the main inlet pipe 200, causing the hydraulic support 1 to enter the liquid and rise to the support state.

[0023] It should be noted that, as Figure 4 shown, the main objective of the hydraulic support 1 is to control the direct roof 5 and the basic roof 6 to prevent separation, and at the same time balance the impact generated by the periodic fracture of the basic roof 6 on the hydraulic support 1 to ensure the safety of the stope. At present, the initial support force provided by the hydraulic pump station in the existing technology is generally 20 - 35 MPa. The initial support force is the active support for the roof of the working face 4, aiming to prevent early separation and subsidence of the roof, thereby maintaining the stability of the overlying rock formation structure, weakening the roof impact load, and ensuring the safe production of the working face. Generally speaking, as the initial support force increases, the roof subsidence amount and subsidence speed decrease significantly.

[0024] Generally, the larger the mining height, the more complete the natural state of the direct roof 5, and the greater the need for the initial support force. Hydraulic supports with extra-large mining heights such as 8.8 m and 10 m have a more urgent need for a greater initial support force.

[0025] Next, the specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0026] The present application provides a device for increasing the initial support force of a hydraulic support, which is mainly applied to multiple hydraulic supports 1 used to support the mine pressure generated by the overlying rock formation in the coal mine fully mechanized mining face operation. Each of the hydraulic supports 1 includes a hydraulic column 10, and the hydraulic column 10 contains high-pressure liquid. The device for increasing the initial support force of the hydraulic support involved in the embodiments of the present application consists of a connecting pipe 600 and a control valve 610 on the connecting pipe 600.

[0027] Among them, as Figure 2 shown, the connecting pipe 600 is arranged between two adjacent hydraulic supports 1 and connects the hydraulic columns 10 in the two adjacent hydraulic supports 1.

[0028] Among them, as Figure 2 shown, the control valve 610 is arranged on each connecting pipe, and the control valve 610 can control the opening and closing of the connecting pipe.

[0029] In this embodiment, the high-pressure liquid in the hydraulic column 10 is emulsion liquid. Additionally, in other embodiments, other liquids can also be used as the high-pressure liquid. For example, hydraulic oil or water, etc.

[0030] Among them, as Figure 1As described above, the emulsion is stored in the emulsion tank 500. When the hydraulic column 10 needs high-pressure liquid for filling and raising the column, the emulsion is input from the emulsion tank 500 through the main liquid supply pipe 200 into the hydraulic columns 10 on the multiple hydraulic supports 1 by multiple pumps in the emulsion pump station 400. When the hydraulic column 10 is discharged and lowered, the emulsion enters the emulsion tank 500 through the main liquid return pipe 300 for storage.

[0031] In this embodiment, the connecting pipe 600 is a high-pressure rubber hose. In addition, in other embodiments, other types of high-pressure pipes can also be used, such as high-pressure metal pipes.

[0032] In this embodiment, the control valve 610 is a two-way control valve. In addition, in other embodiments, other types of control valves can also be used.

[0033] In this embodiment, the rated working pressure of the high-pressure liquid in the hydraulic column 10 is generally 50-80 MPa, and the pressure of the high-pressure liquid reaches the maximum value before the hydraulic column 10 is discharged through the control valve 610. The pressure of the high-pressure liquid at the rated working pressure is much greater than the initial support force provided by the emulsion pump station. When the control valve 610 on the connecting pipe 600 is opened, the high-pressure liquid can be transmitted from the hydraulic column 10 with higher pressure to the hydraulic column 10 with lower pressure, thereby increasing the initial support force of the hydraulic column 10 with lower pressure.

[0034] In summary, the device for improving the initial support force of the hydraulic support provided by the present application can solve the problem that the initial support force provided by the hydraulic pump station for the hydraulic support 1 in the prior art is low and cannot meet the requirements of efficient mining safety. In addition, the hydraulic energy used by the device for improving the initial support force of the hydraulic support provided by the present application comes from the high-pressure liquid in the hydraulic column 10, avoiding the waste of pressure energy. At the same time, the resistance and impact force when the high-pressure liquid is discharged into the main return pipe 300 are reduced, which can effectively reduce the vibration or jumping of the main return pipe 300 caused by the discharge of liquid, and improve the stability of the hydraulic system, the working efficiency and the service life of related parts.

[0035] It can be understood that the present application also provides a method for improving the initial support force of a hydraulic support. The specific method is to utilize the high-pressure liquid energy converted from the mine pressure in the hydraulic column 10 of the hydraulic support 1 before the hydraulic support is drained and lowered, and use the device for improving the initial support force of the hydraulic support as described above to connect multiple hydraulic supports 1, and transmit the high-pressure liquid to other hydraulic supports 1 to improve their initial support force, such as Figure 3 As shown, the specific steps of this method are:

[0036] Step 1: Open the control valve 610 on the connecting pipe 600 on the second hydraulic support that is connected to the adjacent first hydraulic support that completes the lifting support;

[0037] Step 2: High-pressure liquid enters the hydraulic column 10 in the first hydraulic support from the hydraulic column 10 in the second hydraulic support with a higher pressure to increase its initial support force.

[0038] Step 3: When the support force of the first hydraulic support reaches the design pressure or is equal to the pressure of the second hydraulic support, close the control valve 610. Then, the second hydraulic support discharges liquid to lower the support, and then continue with the support moving operation.

[0039] Step 4: After the second hydraulic support completes the support moving operation, supply liquid to raise the support through the emulsion pump station 400 to complete the support again.

[0040] Step 5: Open the control valve 610 on the connecting pipe 600 connecting the third hydraulic support to the second hydraulic support that has completed the support raising and is adjacent. Then, cycle through the above steps.

[0041] In summary, a device for increasing the initial support force of a hydraulic support involved in this application has the following characteristics:

[0042] Through the transfer of hydraulic energy between adjacent support columns, directly utilize the mine pressure to greatly increase the initial support force, breaking through the technical limitation of relying on the supply pressure of the hydraulic pump station to increase the initial support force. By increasing the initial support force, it can effectively prevent or reduce the early separation and subsidence of the roof and the rib spalling of the coal wall, enhancing the safety of the working face; at the same time, reducing the number of hydraulic pumps and operating costs, promoting green mining, and having broad application prospects, good economic and social benefits.

[0043] The connecting pipe and the control valve for connecting between the hydraulic columns form a pressure energy conduction system to achieve the efficient conduction of high-pressure liquid energy.

[0044] On the basis of not changing the existing operation processes and procedures, relatively conveniently achieve a substantial increase in the initial support force of the hydraulic support, and maintain the original design functions of the overall system of the fully mechanized mining face and the hydraulic support.

[0045] In the full text of this application, the terms "adjacent" and "neighboring" refer to the positions that can be connected through the connecting pipe, and do not specifically refer to adjacent positions. The term "comprising" used in the full text of an apparatus for increasing the initial support force of a hydraulic support in this application should not be construed as limited to the content listed thereafter; it does not exclude other structural elements or steps.

[0046] It can be understood that those skilled in the art can combine the features mentioned in one or more of the embodiments mentioned in the full text of this application with the features in other embodiments in any appropriate manner to implement this application.

[0047] Note that the above is only the preferred embodiment of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the technical concept of the present application, more other equivalent embodiments can be included, all of which fall within the protection scope of the present application.

Claims

1. A device for improving the initial support force of a hydraulic support, used for improving the initial support force of multiple hydraulic supports used to support the mine pressure generated by the overlying rock strata in the fully-mechanized mining face of a coal mine, each of the hydraulic supports includes a hydraulic column, and the hydraulic column includes a high-pressure liquid, characterized in that: The multiple hydraulic supports include a first hydraulic support and a second hydraulic support. A connecting pipe is arranged between the first hydraulic support and the second hydraulic support. The connecting pipe is used to connect the hydraulic columns in the first hydraulic support and the second hydraulic support. A control valve is arranged on the connecting pipe, and the control valve can control the opening and closing of the connecting pipe.

2. The device for improving the initial support force of a hydraulic support according to claim 1, characterized in that: The plurality of hydraulic supports also include a third hydraulic support, a fourth hydraulic support and a fifth hydraulic support, which are connected in sequence through the connecting pipe.

3. The device for improving the initial support force of a hydraulic support according to claim 1, characterized in that: The high-pressure liquid in the hydraulic column is an emulsion.

4. The device for improving the initial support force of a hydraulic support according to claim 1 or 2, characterized in that: The connecting pipe is a high-pressure rubber hose.

5. The device for improving the initial support force of a hydraulic support according to claim 1, characterized in that: The control valve is a two-way control valve.

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