A method for determining key inclination parameters of a large-inclination downward-inclined pseudo-inclined working face

Abstract

The application discloses a method for determining key inclination parameters of a large-inclination inclined pseudo-inclined working face, and comprises the following steps: S1, determining a maximum inclination angle based on a calculation method of a hydraulic support pushing stroke; S2, determining a minimum inclination angle based on a calculation method of preventing a scraper conveyor from sliding downward; and S3, determining a reasonable value range of the inclination angle by comprehensively considering the calculation results of steps S1 and S2. The method can quantitatively determine the key inclination parameters of the large-inclination inclined pseudo-inclined working face, reduces the unreliability of the key inclination parameters of the working face relying on traditional experience values, improves the adaptability and stability of the 'three-machine' equipment cooperation of the large-inclination working face, realizes the leap from experience judgment to scientific decision, and provides key technical support for safe and efficient mining of the large-inclination coal seam.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for determining key tilt adjustment parameters applicable to steeply inclined pseudo-sloping working faces. Background Technology

[0002] Safe and efficient mining of steeply inclined coal seams is a significant technical challenge for the coal industry. Under these unique geological conditions, the rational determination of key face tilt adjustment parameters directly affects the coordinated operational stability of critical equipment such as hydraulic supports, scraper conveyors, and coal mining machines. Scientific tilt adjustment design not only significantly improves the overall adaptability of the equipment group but also effectively controls roof pressure distribution, serving as fundamental technical parameters for ensuring safe and efficient production in steeply inclined working faces.

[0003] Currently, engineering practice mainly uses empirical algorithms based on geometric relationships to determine key tilt adjustment parameters. While these traditional methods have some applicability under conventional mining conditions, they reveal significant limitations in complex conditions with large dip angles. On the one hand, simple empirical formulas cannot accurately reflect the dynamic coupling relationship between the hydraulic support pushing system and the coal mining process parameters. On the other hand, existing methods generally ignore the special stress characteristics of the scraper conveyor in a pseudo-inclined arrangement, leading to frequent problems such as equipment misalignment and production process obstruction in actual production. As the coal seam dip angle increases, the engineering problems caused by these technical defects become increasingly significant.

[0004] Therefore, there is an urgent need to invent a method for determining key tilt adjustment parameters in steeply inclined pseudo-slope working faces that is both widely applicable and highly accurate. This method would provide important technical support and implementation basis for effectively solving key technical problems in steeply inclined working face mining, improving mining efficiency, and ensuring safe production. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a method for determining key tilt adjustment parameters applicable to steeply inclined pseudo-inclined working faces. This method can quantitatively determine the key tilt adjustment parameters of steeply inclined pseudo-inclined working faces, reducing the unreliability of relying on traditional empirical values ​​for key tilt adjustment parameters, and improving the adaptability and stability of the coordinated operation of the three key equipment components in steeply inclined working faces. It achieves a leap from experience-based judgment to scientific decision-making, providing key technical support for the safe and efficient mining of steeply inclined coal seams.

[0006] To achieve the above objectives, a first aspect of the present invention proposes a method for determining key tilting parameters applicable to a large-angle pseudo-inclination working face, comprising the following steps:

[0007] S1, the maximum tilt angle is determined based on the calculation method of the hydraulic support pushing stroke;

[0008] S2, The minimum tilt angle is determined based on the calculation method to prevent the scraper conveyor from slipping;

[0009] S3. Based on the calculation results of steps S1 and S2, determine the reasonable range of values ​​for the tilt angle.

[0010] Furthermore, the method for determining key tilting parameters of a large-angle pseudo-inclined working face according to the above embodiments of the present invention may also have the following additional technical features:

[0011] According to an embodiment of the present invention, step S1 includes:

[0012] S11, establish the planar geometric relationship of "hydraulic support pushing conveyor - coal mining machine cutting";

[0013] S12, the maximum tilt angle is calculated using the following formula:

[0014] β =arccos( l g / ( or · l t ))

[0015] in, β This is the pseudo-oblique angle of the working surface, in degrees; l g The cutting depth in coal mining is expressed in mm. l t The design stroke for the jack is given, and the unit is mm. or The actual pushing rate of the jack.

[0016] According to an embodiment of the present invention, step S2 includes:

[0017] S21, construct a mechanical model of "hydraulic support-scraper conveyor-coal mining machine";

[0018] S22, the minimum tilt angle is calculated using the following mechanical equilibrium equation:

[0019]

[0020] in, m 刮 The weight of a single hydraulic support pushing the "scraper conveyor-coal mining machine" system is expressed in kg. g This is the acceleration due to gravity, expressed in m / s². α This represents the true dip angle of the coal seam, in degrees. β This is the pseudo-oblique angle of the working surface, in degrees; m The coefficient of friction between the scraper conveyor-coal mining machine system and the coal seam floor.F 支推 The thrust of the hydraulic support jack is expressed in N.

[0021] According to an embodiment of the present invention, in step S22, the specific derivation process of the mechanical equilibrium equation includes:

[0022] S221, First, the weight of the hydraulic support pushing the scraper conveyor is initially calculated using the following formula:

[0023]

[0024] in, m 刮板设计 The total design weight of the scraper conveyor is in kg. n 1. The number of central tanks is reduced to meet the requirements of the study; m 中部槽 The weight of a single central tank is in kg. m 刮板链 The weight of the scraper chain is reduced for the purposes of this study; the unit is kg. m 调节链 The weight of the regulating chain was reduced for the purpose of the study; the unit is kg. n 2 represents the number of hydraulic supports within the working face;

[0025] S222, the force analysis of the hydraulic support pushing along the coal face to prevent the scraper conveyor from sliding down is performed, and the calculation is performed using the following formula:

[0026]

[0027] in, F 下滑 The component of the downward force on the coal face of the "scraper conveyor-coal mining machine" system is expressed in N;

[0028] S223, if the component of the hydraulic support's pushing force in the coal face direction can be balanced with the sliding force of the "scraper conveyor-mining machine" system in the coal face direction, then:

[0029]

[0030]

[0031] in, F 上推 This represents the component of the hydraulic support's pushing force in the direction of the coal face, expressed in N.

[0032] S224, combining the formulas from steps S222 and S223, we get:

[0033] .

[0034] According to one embodiment of the present invention, the method further includes:

[0035] The width of the working surface after skewing is calculated using the following formula. l m2 :

[0036] l m2 = l m1 / cos β

[0037] in, l m1 The width of the truly inclined working surface is expressed in meters (m).

[0038] According to one embodiment of the present invention, the method further includes:

[0039] The distance between the ventilation roadway and the machine roadway is calculated using the following formula. l t :

[0040] l t = l m1 ·tan β .

[0041] According to one embodiment of the present invention, the method further includes:

[0042] The pseudo-pitch angle is calculated using the following formula. c :

[0043] c =arcsin(cos β ·sin α ).

[0044] According to one embodiment of the present invention, the method further includes:

[0045] Calculate the angle of depression using the following formula. :

[0046] =arcsin(sin β ·sin α ).

[0047] Compared with existing technologies, the advantages of the method for determining key tilt adjustment parameters for a large-angle pseudo-inclined working face disclosed in this invention are:

[0048] (1) This invention establishes a complete theoretical calculation system and realizes the scientific quantitative determination of key tilting parameters.

[0049] (2) This invention breaks through the limitations of traditional empirical methods and significantly improves the accuracy and reliability of calculation.

[0050] (3) The present invention ensures the wide applicability and stability of the method by comprehensively considering multiple parameters.

[0051] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0052] Figure 1 A flowchart illustrating a method for determining key tilting parameters applicable to a large-angle pseudo-inclined working face according to an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the planar geometric relationship of "hydraulic support pushing conveyor - coal mining machine cutting" according to an embodiment of the present invention.

[0054] Figure 3 This is a schematic diagram of the stress analysis of a "scraper conveyor-coal mining machine" under natural inclination angle according to an embodiment of the present invention.

[0055] Figure 4 This is a schematic diagram of the stress analysis of the "scraper conveyor-coal mining machine" under the adjusted tilt angle according to an embodiment of the present invention.

[0056] Figure 5 This is a schematic diagram illustrating the calculation of key angles in a three-dimensional model of a pseudo-inclined mining operation according to an embodiment of the present invention. Detailed Implementation

[0057] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0058] The following description, with reference to the accompanying drawings, describes a method for determining key tilting parameters applicable to large-angle pseudo-inclined working faces, as proposed in an embodiment of the present invention.

[0059] like Figure 1 As shown, the method for determining key tilt adjustment parameters for a large-angle pseudo-inclined working face according to an embodiment of the present invention may include the following steps:

[0060] S1, the maximum tilt angle is determined based on the calculation method of the hydraulic support pushing stroke.

[0061] According to an embodiment of the present invention, step S1 includes:

[0062] S11, establish the planar geometric relationship of "hydraulic support pushing conveyor - coal mining machine cutting". The planar geometric relationship of "hydraulic support pushing conveyor - coal mining machine cutting" is as follows: Figure 2 As shown, the core of this planar geometric relationship construction is: the essence of the advanced tilt angle adjustment is the matching problem of the spatial projection relationship between the hydraulic support displacement and the coal mining machine cutting depth in the dip direction. Because the pseudo-tilt working face is affected by the coal seam dip angle ( α ) and pseudo-oblique angle ( β The combined effect of hydraulic support and coal cutting machine can lead to the pusher stroke failing to cover the single-blade cutting depth of the coal mining machine, resulting in a "compensatory lag" in the pusher movement. This can force the machine to stop and restart, disrupting the stability of continuous operation. To ensure the orderly progress of the hydraulic support pusher and the coal mining machine cutting process, the maximum pseudo-inclination adjustment angle of the working face can be determined.

[0063] S12, the maximum tilt angle is calculated using the following formula:

[0064] β =arccos( l g / ( or · l t ))

[0065] in, β This is the pseudo-oblique angle of the working surface, in degrees; l g The cutting depth in coal mining is expressed in mm. l t The design stroke for the jack is given, and the unit is mm. or The actual displacement rate of the jack is used in the calculation of the hydraulic support's pushing stroke. or Generally, 90% is used, but this can be adjusted according to the equipment and on-site engineering geological conditions.

[0066] For example, taking a steeply dipped working face in a mine in Huaibei as an example, the true dip angle of the coal seam in this steeply dipped working face is... α The width of the working face under the condition of a true inclination of 29° is [missing information]. l m1The working face is 125 m long; the working face uses ZZ11000 / 25.5 / 56D type support and shield hydraulic support, with a jack cylinder diameter and pushing stroke of 900 mm, and a single hydraulic support pushing jack thrust of 505000 N; the working face is equipped with MG-750 / 1940-WD type chainless electric traction coal mining machine, with a total power of 1940 kW, adopting a double drum design, and a cutting depth of 800 mm; the working face is equipped with SGZ1000 / 2000 type scraper conveyor. Referring to the relevant technical parameter specifications of SGZ1000 / 2000 type scraper conveyor and MG750 / 1940-GWD type AC electric traction coal mining machine, the weight allocated to the single hydraulic support pushing "scraper conveyor-coal mining machine" system is calculated to be 8170 kg.

[0067] The calculation method based on the hydraulic support pushing stroke requires determining the following parameters: the pushing stroke of the hydraulic support pushing jack is 900 mm; the actual pushing rate of the pushing jack. or Take 90%; the coal cutting depth is 800 mm. Substituting the corresponding parameters into the above formula, the maximum tilt angle can be obtained. β It is approximately equal to 9°.

[0068] S2, the minimum tilt angle is determined based on the calculation method to prevent the scraper conveyor from slipping.

[0069] According to an embodiment of the present invention, step S2 includes:

[0070] S21, construct a mechanical model of the "hydraulic support-scraper conveyor-coal mining machine". The mechanical model of the "hydraulic support-scraper conveyor-coal mining machine" is as follows: Figure 3 and Figure 4 As shown, the core of this mechanical model is: if the hydraulic support has no rigid constraint on the scraper conveyor in the direction within the working face, then the upward component of the force on the scraper conveyor in the direction of the coal wall by pushing the jack can completely offset the downward force of the hydraulic support along the direction of the coal wall. The critical angle at this time is the minimum pseudo-tilt adjustment angle of the working face.

[0071] S22, the minimum tilt angle is calculated using the following mechanical equilibrium equation:

[0072]

[0073] in, m 刮 The weight of a single hydraulic support pushing the "scraper conveyor-coal mining machine" system is expressed in kg. g This is the acceleration due to gravity, expressed in m / s². α This represents the true dip angle of the coal seam, in degrees. β This is the pseudo-oblique angle of the working surface, in degrees; mThe coefficient of friction between the scraper conveyor-coal mining machine system and the coal seam floor. F 支推 The thrust of the hydraulic support jack is expressed in Newtons (N). The coefficient of friction is... m Generally, a coefficient of friction of 0.2 is used, which is the same. m It can be dynamically adjusted according to the different equipment of the manufacturer.

[0074] For example, by substituting the aforementioned parameters into the above mechanical equilibrium equation, we can obtain that the minimum advance angle of the working face is approximately 2.8°.

[0075] According to an embodiment of the present invention, in step S22, the specific derivation process of the mechanical equilibrium equation includes:

[0076] S221, First, the weight of the hydraulic support pushing the scraper conveyor is initially calculated using the following formula:

[0077]

[0078] in, m 刮板设计 The total design weight of the scraper conveyor is in kg. n 1. The number of central tanks is reduced to meet the requirements of the study; m 中部槽 The weight of a single central tank is in kg. m 刮板链 The weight of the scraper chain is reduced for the purposes of this study; the unit is kg. m 调节链 The weight of the regulating chain was reduced for the purpose of the study; the unit is kg. n 2 represents the number of hydraulic supports within the working face;

[0079] S222, the force analysis of the hydraulic support pushing along the coal face to prevent the scraper conveyor from sliding down is performed, and the calculation is performed using the following formula:

[0080]

[0081] in, F 下滑 The component of the downward force on the coal face of the "scraper conveyor-coal mining machine" system is expressed in N;

[0082] S223, if the component of the hydraulic support's pushing force in the coal face direction can be balanced with the sliding force of the "scraper conveyor-mining machine" system in the coal face direction, then:

[0083]

[0084]

[0085] in, F 上推 This represents the component of the hydraulic support's pushing force in the direction of the coal face, expressed in N.

[0086] S224, combining the formulas from steps S222 and S223, we get:

[0087] .

[0088] S3. Based on the calculation results of steps S1 and S2, determine the reasonable range of values ​​for the tilt angle.

[0089] Determine a reasonable range for the tilt angle, specifically by setting the minimum tilt angle... α min is used as the lower limit, and the maximum tilt angle is set as follows: α `max` serves as the upper limit, forming the interval [ α min, α max).

[0090] According to one embodiment of the present invention, the method further includes:

[0091] The width of the working surface after skewing is calculated using the following formula. l m2 :

[0092] l m2 = l m1 / cos β

[0093] in, l m1 The width of the truly inclined working surface is expressed in meters (m).

[0094] According to one embodiment of the present invention, the method further includes:

[0095] The distance between the ventilation roadway and the machine roadway is calculated using the following formula. l t :

[0096] l t = l m1 ·tan β .

[0097] According to one embodiment of the present invention, the method further includes:

[0098] The pseudo-pitch angle is calculated using the following formula. c :

[0099] c =arcsin(cosβ ·sin α ).

[0100] According to one embodiment of the present invention, the method further includes:

[0101] Calculate the angle of depression using the following formula. :

[0102] =arcsin(sin β ·sin α ).

[0103] Key angles such as Figure 5 As shown. Based on the aforementioned parameters, the key perspectives are summarized in Table 1.

[0104] Table 1

[0105]

[0106] By combining the calculation methods based on the hydraulic support pushing stroke and the calculation methods based on preventing the scraper conveyor from slipping, the tilt angle of the large-angle working face can be determined. β The reasonable range for the value of ) is 2.8° to 9°. Corresponding to this range, the distance between the ventilation roadway and the machine roadway ( l t The elevation ranges from 6.114 to 19.798 m, and the pseudo-oblique angle is ( c The angle of depression is 28.962° to 28.610°. The angle is 1.357° to 4.350°, and the width of the working surface after adjustment is ( l m2 The range is 125.149–126.558 m.

[0107] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0109] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0110] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for determining key tilting parameters applicable to a large-angle pseudo-inclined working face, characterized in that, Includes the following steps: S1, the maximum tilt angle is determined based on the calculation method of the hydraulic support pushing stroke; S2, The minimum tilt angle is determined based on the calculation method to prevent the scraper conveyor from slipping; S3, combining the calculation results of steps S1 and S2, determine the reasonable range of values ​​for the tilt angle; wherein, step S2 includes: S21, construct a mechanical model of "hydraulic support-scraper conveyor-coal mining machine"; S22, the minimum tilt angle is calculated using the following mechanical equilibrium equation: in, m 刮 The weight of a single hydraulic support pushing a scraper conveyor-coal mining machine system is expressed in kg. g This is the acceleration due to gravity, expressed in m / s². α This represents the true dip angle of the coal seam, in degrees. β This is the pseudo-oblique angle of the working surface, in degrees; μ The coefficient of friction between the scraper conveyor-coal mining machine system and the coal seam floor. F 支推 The thrust of the hydraulic support jack, expressed in N; In step S22, the specific derivation process of the mechanical equilibrium equation includes: S221, First, the weight of the hydraulic support pushing the scraper conveyor is initially calculated using the following formula: in, m 刮板设计 The total design weight of the scraper conveyor is in kg. n 1. The number of central tanks is reduced to meet the requirements of the study; m 中部槽 The weight of a single central tank is in kg. m 刮板链 The weight of the scraper chain is reduced for the purposes of this study; the unit is kg. m 调节链 The weight of the regulating chain was reduced for the purpose of the study; the unit is kg. n 2 represents the number of hydraulic supports within the working face; S222, the force analysis of the hydraulic support pushing along the coal face to prevent the scraper conveyor from sliding down is performed, and the calculation is performed using the following formula: in, F 下滑 The component of the downward force on the coal face of the "scraper conveyor-coal mining machine" system is expressed in N; S223, if the component of the hydraulic support's pushing force in the coal face direction can be balanced with the sliding force of the "scraper conveyor-mining machine" system in the coal face direction, then: in, F 上推 This represents the component of the hydraulic support's pushing force in the direction of the coal face, expressed in N. S224, combining the formulas from steps S222 and S223, we get: 。 2. The method for determining key tilt adjustment parameters applicable to a large-angle pseudo-inclined working face according to claim 1, characterized in that, Step S1 includes: S11, establish the planar geometric relationship of "hydraulic support pushing conveyor - coal mining machine cutting"; S12, the maximum tilt angle is calculated using the following formula: β =arccos( l g / ( η · l t )) in, β This is the pseudo-oblique angle of the working surface, in degrees; l g The cutting depth in coal mining is expressed in mm. l t The design stroke for the jack is given, and the unit is mm. η The actual pushing rate of the jack.

3. The method for determining key tilt adjustment parameters applicable to a large-angle pseudo-inclined working face according to claim 1, characterized in that, The method further includes: The width of the working surface after skewing is calculated using the following formula. l m2 : l m2 = l m1 / cos β in, l m1 The width of the truly inclined working surface is expressed in meters (m).

4. The method for determining key tilt adjustment parameters applicable to a large-angle pseudo-inclined working face according to claim 1, characterized in that, The method further includes: The distance between the ventilation roadway and the machine roadway is calculated using the following formula. l t : l t = l m1 ·tan β 。 5. The method for determining key tilt adjustment parameters applicable to a large-angle pseudo-inclined working face according to claim 1, characterized in that, The method further includes: The pseudo-pitch angle is calculated using the following formula. γ : γ =arcsin(cos β ·without α )。 6. The method for determining key tilt adjustment parameters applicable to a large-angle pseudo-inclined working face according to claim 1, characterized in that, The method further includes: Calculate the angle of depression using the following formula. : =arcsin(sin β ·its α )。

Images