Coal face hydraulic support pulling and moving method

Abstract

The invention discloses a coal face hydraulic support pulling and moving method which comprises the steps that the top plate breaking condition of a coal face is obtained, and the top plate breaking state is determined in combination with a preset breaking numerical value; the pulling direction and distance of the hydraulic support are determined according to the roof breaking state; according to the determined pulling direction and distance requirements, the height and position of the hydraulic support are adjusted by controlling a hydraulic system, the hydraulic support is pushed step by step, and the top plate is pulled to the safe position. The hydraulic support is pulled according to the roof breaking condition, the position of the support can be adjusted in time, the accident risk caused by roof breaking is avoided or reduced, and the safety of the working face is improved. The problem that the roof of the coal face is broken is common, through a hydraulic support pulling and moving method, the support can be accurately adjusted according to the real-time breaking condition, the stability of the roof is effectively controlled, the roof is prevented from collapsing and being broken, and the safety of personnel and equipment is protected.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine working face support, and in particular to a method for pulling and moving a hydraulic support on a coal mining working face. Background Art

[0002] In coal mining working faces, coal mining will cause changes in the force on the roof, which may cause problems such as roof breakage and sinking, endangering the safety of miners and the integrity of equipment. In order to reduce roof pressure, stabilize the roof structure, and improve the safety and production efficiency of coal mining working faces, hydraulic support pulling technology is widely used.

[0003] The pull-and-slide support is mainly used to support the roof of the coal mine working face to prevent accidents such as roof collapse and breakage. By adjusting the position and height of the support, the stability of the roof can be effectively controlled to ensure the normal progress of coal mining operations. The pull-and-slide support is usually composed of hydraulic cylinders, hydraulic stations, support bodies and other components. The hydraulic cylinder can realize the up and down movement of the support and adjust the support position of the roof; the hydraulic station provides a power source to control the extension and contraction of the support; the support body bears the load of the roof and supports the working face. The hydraulic support is a support device that can control the height and position through a hydraulic system. During the coal mining process, when the roof is broken, by adjusting the height and position of the hydraulic support, the roof can be effectively supported, the pressure on the roof can be reduced, and further collapse or breakage can be prevented.

[0004] At present, the order of pulling and moving the hydraulic supports in the coal mining working face of a coal mine is to pull and move them in sequence according to the support numbers. This causes the roof in the area where the supports are not pulled to fall due to delayed support. The roof of some coal mine working faces is highly fragile. When the supports are not followed up in time, the roof is prone to breakage and collapse, increasing the risk of roof collapse. Due to lack of support, the roof in the unmoved area collapses above the coal mining working face, which may cause casualties and equipment damage in severe cases. Due to delayed support, the roof in the unmoved area may be affected by mining pressure and may experience local or overall roof collapse, posing a major threat to mine safety. Summary of the invention

[0005] The purpose of the present invention is to provide a method for pulling and moving hydraulic supports for coal mining working faces, which can be pulled and moved according to the situation of roof crushing, ensure that the working face supports are in place, avoid or reduce the risk of accidents caused by roof crushing, and solve the technical problem in the background technology that the roof in the area where the supports are not pulled will fall due to delayed support due to the sequential pulling according to the support numbers.

[0006] To achieve the above-mentioned purpose, the present invention provides a method for pulling and moving a hydraulic support in a coal mining face, comprising:

[0007] Obtain the roof crushing situation of the coal mining working face, and determine the roof crushing state based on the preset crushing value;

[0008] Determine the pulling direction and distance of the hydraulic support according to the broken state of the roof;

[0009] According to the requirements of the determined pulling direction and distance, the height and position of the hydraulic support are adjusted by controlling the hydraulic system, and the hydraulic support is gradually pushed to pull the top plate to a safe position.

[0010] As a further solution of the present invention, the obtaining of the roof crushing condition of the coal mining working face and determining the roof crushing state in combination with a preset crushing value includes:

[0011] The roof condition of the coal mining working face is less than the first preset value, and the roof condition is relatively intact;

[0012] The roof condition of the coal mining working face is greater than the first preset value and less than the second preset value, and the roof condition is relatively broken;

[0013] When the roof condition of the coal mining working face is greater than the second preset value, the roof condition is very broken;

[0014] When the roof condition of the coal mining working face is greater than the third preset value, the roof state is broken and it is difficult to move the frame.

[0015] As a further solution of the present invention, the method of determining the pulling direction and distance of the hydraulic support according to the roof crushing state includes:

[0016] When the roof is in a relatively good condition, the working face is used to pull the movable supports in one direction in sequence. The supports are pulled and moved in sequence according to the support numbers 1# to n# to support the roof.

[0017] As a further solution of the present invention, the method of determining the pulling direction and distance of the hydraulic support according to the roof crushing state includes:

[0018] When the roof is in a relatively broken state, use interval pulling support.

[0019] As a further solution of the present invention, the use of interval pulling bracket includes:

[0020] The supports are pulled and moved in sequence according to the support number An=2n-1 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the support number to be pulled and moved next time;

[0021] Then, the brackets are pulled and moved in sequence according to the bracket numbers An'=2n, wherein n is a positive integer starting from 1, and An' is the bracket number to be pulled and moved next time.

[0022] As a further solution of the present invention, the method of determining the pulling direction and distance of the hydraulic support according to the roof crushing state includes:

[0023] When the roof is in a very broken state, use two supports at intervals to pull the support.

[0024] As a further solution of the present invention, the method of pulling and moving the bracket by spacing two brackets comprises:

[0025] The supports are pulled and moved in the order of An=3n-2 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the number of the support to be pulled and moved next time;

[0026] Secondly, the brackets are pulled and moved in the order of An'=3n-1, where n is a positive integer starting from 1, and An' is the number of the bracket to be pulled next time;

[0027] Finally, the brackets are pulled and moved in the order of An"=3n, where n is a positive integer starting from 1 and An" is the number of the bracket to be pulled and moved next time.

[0028] As a further solution of the present invention, the method of determining the pulling direction and distance of the hydraulic support according to the roof crushing state includes:

[0029] When the roof is broken and it is difficult to move the frame, a single hydraulic support is used to provide diagonal support to assist in pulling and moving the support.

[0030] As a further solution of the present invention, the method of using a single hydraulic prop to provide diagonal support and assist in pulling and moving the support includes:

[0031] When pulling the bracket numbered n#, one end of the single hydraulic support is supported on the base position of the bracket numbered n+1#, and the other end of the single hydraulic support is supported on the top beam position of the bracket numbered n#. By supplying high-pressure liquid to the single hydraulic support over a long distance, the bracket numbered n# can be assisted in pulling.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The method for pulling and moving a hydraulic support of a coal mining face provided by the present invention comprises: obtaining the crushing condition of the roof of the coal mining face, and determining the crushing state of the roof in combination with a preset crushing value; determining the pulling direction and distance of the hydraulic support according to the crushing state of the roof; and adjusting the height and position of the hydraulic support by controlling the hydraulic system according to the requirements of the determined pulling direction and distance, and gradually pushing the hydraulic support to pull and move the roof to a safe position. By pulling and moving the hydraulic support according to the crushing condition of the roof, the position of the support can be adjusted in time, the risk of accidents caused by the crushing of the roof can be avoided or reduced, and the safety of the working face can be improved. The crushing of the roof of the coal mining face is a common problem. Through the method for pulling and moving the hydraulic support, the support can be accurately adjusted according to the real-time crushing condition, the stability of the roof can be effectively controlled, the collapse and crushing of the roof can be prevented, and the safety of personnel and equipment can be protected. Reasonable pulling and moving of the hydraulic support can keep the support at a suitable distance from the coal wall, which is conducive to the efficient mining of the coal seam and the transportation of ore, and reduces the problems of coal blockage and traffic jam in the coal mining process, and improves the coal mining efficiency. By timely adjusting the position of the hydraulic support, the interface between coal and gangue can be controlled, the mixing of coal and gangue can be reduced, and the quality and market competitiveness of coal can be improved. Reasonable hydraulic support pulling and moving can reduce the impact and wear of roof crushing and rockfall on coal mining equipment, extend the service life of equipment, and reduce maintenance and replacement costs. The hydraulic support pulling and moving method based on the roof crushing situation can improve the safety of the working face, the ability to control the roof, and the efficiency of coal mining, while reducing the risk of coal and gangue mixing and equipment damage. This is an effective management and adjustment method that helps optimize coal mining operations and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flow chart of a method for pulling and moving a hydraulic support in a coal mining working face in an embodiment;

[0035] Figure 2 This is a schematic diagram of another embodiment of using a single hydraulic prop to provide diagonal support and assist in pulling and moving the support;

[0036] Among them, 1-working face hydraulic support, 2-working face tunnel, 3-single hydraulic support. DETAILED DESCRIPTION

[0037] In order to enable persons skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below in conjunction with the drawings in one or more embodiments of this specification. Obviously, the described embodiments are only one or more partial embodiments of this specification, rather than all embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0038] It should be noted that, in the absence of conflict, one or more embodiments and features in the embodiments in this specification can be combined with each other. One or more embodiments of this specification will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] The pull-and-slide support is mainly used to support the roof of the coal mine working face to prevent accidents such as roof collapse and breakage. By adjusting the position and height of the support, the stability of the roof can be effectively controlled to ensure the normal progress of coal mining operations. The pull-and-slide support is usually composed of hydraulic cylinders, hydraulic stations, support bodies and other components. The hydraulic cylinder can realize the up and down movement of the support and adjust the support position of the roof; the hydraulic station provides a power source to control the extension and retraction of the support; the support body bears the roof load and supports the working face.

[0040] In actual operations, miners adjust the working state of the hydraulic cylinder by operating the control system according to the specific conditions of the working face, so that the support can be pulled and moved. It is usually necessary to flexibly select the position and height of the pulling support according to the geological conditions of the working face, coal mining methods and other factors to ensure the stability of the roof. The pulling support has the advantages of easy operation, flexible adjustment, safety and reliability. The position of the support can be adjusted in time according to the crushing of the roof or the progress of the working face to ensure the continuity and safety of the coal mining operation. The pulling support is widely used in coal mining work in coal mines, especially in working faces that require precise control of the roof, such as thin coal seams and easily collapsed coal seams. The pulling support of the coal mining working face is an important coal mining technology in coal mines. It can effectively ensure the safe production of the working face and improve coal mining efficiency. It is one of the indispensable important equipment in coal mine production.

[0041] See also Figure 1 , a method for pulling and moving a hydraulic support on a coal mining face, comprising:

[0042] S101, obtaining the roof crushing condition of the coal mining working face, and determining the roof crushing state in combination with a preset crushing value;

[0043] S102, determining the pulling direction and distance of the hydraulic support according to the roof crushing state;

[0044] S103, according to the determined pulling direction and distance requirements, the height and position of the hydraulic support are adjusted by controlling the hydraulic system, and the hydraulic support is gradually pushed to pull the top plate to a safe position.

[0045] By pulling and moving the hydraulic support according to the roof crushing situation, the position of the support can be adjusted in time, the accident risk caused by the roof crushing can be avoided or reduced, and the safety of the working face can be improved. Roof crushing of coal mining working faces is a common problem. Through the hydraulic support pulling and moving method, the support can be accurately adjusted according to the real-time crushing situation, the stability of the roof can be effectively controlled, the roof collapse and crushing can be prevented, and the safety of personnel and equipment can be protected. Reasonable hydraulic support pulling and moving can keep the support and the coal wall at a suitable distance, which is conducive to the efficient mining of the coal seam and the transportation of ore, reduce coal blockage, traffic jams and other problems in the coal mining process, and improve coal mining efficiency. By adjusting the position of the hydraulic support in time, the interface between coal and gangue can be controlled, the mixing of coal gangue can be reduced, and the quality and market competitiveness of coal can be improved. Reasonable hydraulic support pulling and moving can reduce the impact and wear of roof crushing and falling rocks on coal mining equipment, extend the service life of equipment, and reduce maintenance and replacement costs. The hydraulic support pulling and moving method according to the roof crushing situation can improve the safety of the working face, the roof control ability and coal mining efficiency, while reducing the risk of coal gangue mixing and equipment damage. This is an effective management and adjustment method that helps optimize coal mining operations and improve production efficiency.

[0046] In one embodiment, obtaining the roof crushing condition of the coal mining working face and determining the roof crushing state in combination with a preset crushing value (i.e., S101) includes:

[0047] The roof condition of the coal mining working face is less than the first preset value, and the roof condition is relatively intact;

[0048] The roof condition of the coal mining working face is greater than the first preset value and less than the second preset value, and the roof condition is relatively broken;

[0049] When the roof condition of the coal mining working face is greater than the second preset value, the roof condition is very broken;

[0050] When the roof condition of the coal mining working face is greater than the third preset value, the roof state is broken and it is difficult to move the frame.

[0051] On the coal mining face of a coal mine, roof crushing can be divided into four categories according to its severity, including: Mild crushing: Mild crushing refers to a small number of cracks or local fine crushing on the roof, without obvious block crushing or falling blocks. It has little impact on the coal mining face and will not pose a significant threat to production safety.

[0052] Moderate crushing: Moderate crushing refers to the appearance of more cracks in the roof or block crushing in local areas. A certain number of fragments may fall, which has a greater impact on the coal mining working face. Support measures need to be taken in time to prevent further deterioration.

[0053] Severe crushing: Severe crushing refers to the appearance of large-scale cracks and block-like crushing in the roof, which may be accompanied by a large number of fragments falling, posing a significant threat to the safety of the coal mining face and requiring immediate and effective control and support measures.

[0054] Critical crushing: Critical crushing refers to serious rock fractures, large-scale block crushing or even overall collapse of the roof, which may lead to serious accident risks at the coal mining face. It is necessary to immediately stop operations and take emergency measures to ensure the safety of personnel and equipment.

[0055] Classifying the roof crushing situation according to its severity helps mine managers and technicians to quickly evaluate and make decisions on the problem, so as to take appropriate measures to deal with and control the roof crushing problem in a timely manner and ensure the safe production of the coal mining face. In specific applications, engineers can determine the range of the first preset value, the second preset value and the third preset value based on actual engineering experience.

[0056] In one embodiment, the step of determining the pulling direction and distance of the hydraulic support according to the roof crushing state (ie, S102) includes:

[0057] When the roof is in a relatively good condition, the working face is used to pull the movable supports in one direction in sequence. The supports are pulled and moved in sequence according to the support numbers 1# to n# to support the roof.

[0058] In one embodiment, the step of determining the pulling direction and distance of the hydraulic support according to the roof crushing state (ie, S102) includes:

[0059] When the roof is in a relatively broken state, use interval pulling support.

[0060] Adopt interval pulling bracket, including:

[0061] Pull and move the supports in sequence according to the support number An=2n-1 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the support number to be pulled next time;

[0062] Then, the brackets are pulled and moved in sequence according to the bracket numbers An'=2n, wherein n is a positive integer starting from 1, and An' is the bracket number to be pulled and moved next time.

[0063] That is, first pull the 1# support, and then pull the 3# support, 5# support, 7# support, 9# support..., 2n-1# support in sequence. In this way, the top plate area of ​​the rectification working face is basically supported in place at the first time, and finally fill in the remaining An1=2n supports in sequence, that is, 2# support, 4# support..., 2n# support.

[0064] In one embodiment, the step of determining the pulling direction and distance of the hydraulic support according to the roof crushing state (ie, S102) includes:

[0065] When the roof is in a very broken state, use two supports at intervals to pull the support.

[0066] Use two brackets at intervals to pull the bracket, including:

[0067] The supports are pulled and moved in the order of An=3n-2 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the number of the support to be pulled and moved next time;

[0068] Secondly, the brackets are pulled and moved in the order of An'=3n-1, where n is a positive integer starting from 1, and An' is the number of the bracket to be pulled next time;

[0069] Finally, the brackets are pulled and moved in the order of An"=3n, where n is a positive integer starting from 1 and An" is the number of the bracket to be pulled and moved next time.

[0070] That is, first pull the 1# support, and then pull the 4# support, 7# support, 10# support, 13# support..., 3n-2# support in sequence. In this way, the top plate area of ​​the working face is basically supported in place at the first time. Secondly, pull the 2# support, 5# support, 8# support, 11# support..., 3n-1# support in sequence; finally, pull the 3# support, 6# support, 9# support, 12# support..., 3n# support in sequence.

[0071] In one embodiment, the step of determining the pulling direction and distance of the hydraulic support according to the roof crushing state (ie, S102) includes:

[0072] When the roof is broken and it is difficult to move the frame, a single hydraulic support is used to provide diagonal support to assist in pulling and moving the support.

[0073] like Figure 2 As shown, a single hydraulic prop is used to provide diagonal support to assist in pulling and moving the support, including:

[0074] When pulling the bracket numbered n#, one end of the single hydraulic support is supported on the base position of the bracket numbered n+1#, and the other end of the single hydraulic support is supported on the top beam position of the bracket numbered n#. By supplying high-pressure liquid to the single hydraulic support over a long distance, the bracket numbered n# can be assisted in pulling.

[0075] Take the pulling of the 1# support as an example. One end of the single hydraulic prop 3 is supported on the base of the 2# support next to it, and the other end is supported on the top beam of the 1# support. By supplying high-pressure liquid to the single hydraulic prop 3 over a long distance, the effect of assisting the pulling of the 1# support is achieved. The rest of the supports can be pulled in the same way.

[0076] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification should be included in the scope of one or more claims of this specification.

Claims

1. A method for pulling and moving a hydraulic support in a coal mining face, characterized in that: include: Obtain the roof crushing situation of the coal mining working face, and determine the roof crushing state based on the preset crushing value; Determine the pulling direction and distance of the hydraulic support according to the broken state of the roof; According to the requirements of the determined pulling direction and distance, the height and position of the hydraulic support are adjusted by controlling the hydraulic system, and the hydraulic support is gradually pushed to pull the top plate to a safe position.

2. The method for pulling and moving a hydraulic support in a coal mining face according to claim 1, characterized in that: The obtaining of the roof crushing condition of the coal mining working face and determining the roof crushing state in combination with a preset crushing value includes: The roof condition of the coal mining working face is less than the first preset value, and the roof condition is relatively intact; The roof condition of the coal mining working face is greater than the first preset value and less than the second preset value, and the roof condition is relatively broken; When the roof condition of the coal mining working face is greater than the second preset value, the roof condition is very broken; When the roof condition of the coal mining working face is greater than the third preset value, the roof state is broken and it is difficult to move the frame.

3. The method for pulling and moving a hydraulic support in a coal mining face according to claim 2, characterized in that: The method of determining the pulling direction and distance of the hydraulic support according to the broken state of the roof includes: When the roof is in a relatively good condition, the working face is used to pull the movable supports in one direction in sequence. The supports are pulled and moved in sequence according to the support numbers 1# to n# to support the roof.

4. The method for pulling and moving a hydraulic support in a coal mining face according to claim 2, characterized in that: The method of determining the pulling direction and distance of the hydraulic support according to the broken state of the roof includes: When the roof is in a relatively broken state, use interval pulling support.

5. The method for pulling and moving a hydraulic support in a coal mining face according to claim 4, characterized in that: The method of using an interval pulling bracket comprises: The supports are pulled and moved in sequence according to the support number An=2n-1 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the support number to be pulled and moved next time; Then, the brackets are pulled and moved in sequence according to the bracket numbers An'=2n, wherein n is a positive integer starting from 1, and An' is the bracket number to be pulled and moved next time.

6. The method for pulling and moving a hydraulic support in a coal mining face according to claim 2, characterized in that: The method of determining the pulling direction and distance of the hydraulic support according to the broken state of the roof includes: When the roof is in a very broken state, use two supports at intervals to pull the support.

7. The method for pulling and moving a hydraulic support in a coal mining face according to claim 6, characterized in that: The method of pulling and moving the bracket by spacing two brackets comprises: The supports are pulled and moved in the order of An=3n-2 to complete the initial support of the roof area of ​​the coal mining face, where n is a positive integer starting from 1 and An is the number of the support to be pulled and moved next time; Secondly, the brackets are pulled and moved in the order of An'=3n-1, where n is a positive integer starting from 1, and An' is the number of the bracket to be pulled next time; Finally, the brackets are pulled and moved in the order of An"=3n, where n is a positive integer starting from 1 and An" is the number of the bracket to be pulled and moved next time.

8. The method for pulling and moving a hydraulic support in a coal mining face according to claim 2, characterized in that: The method of determining the pulling direction and distance of the hydraulic support according to the broken state of the roof includes: When the roof is broken and it is difficult to move the frame, a single hydraulic support is used to provide diagonal support to assist in pulling and moving the support.

9. The method for pulling and moving a hydraulic support in a coal mining face according to claim 8, characterized in that: The method of using a single hydraulic prop to provide diagonal support and assist in pulling and moving the support includes: When pulling the bracket numbered n#, one end of the single hydraulic support is supported on the base position of the bracket numbered n+1#, and the other end of the single hydraulic support is supported on the top beam position of the bracket numbered n#. By supplying high-pressure liquid to the single hydraulic support over a long distance, the bracket numbered n# can be assisted in pulling.

Images