Method for determining process parameters of shearer tracking spraying in fully mechanized mining face

Abstract

The present invention relates to a method for determining process parameters of tracking spraying for a fully mechanized face coal mining machine, and belongs to the field of dust reduction technology. The coal mining machine is driven by a drum to move and cut coal. A plurality of hydraulic supports arranged linearly are provided above the coal mining machine, and sprays are evenly arranged inside the hydraulic supports. The number of spray groups in working state is n, the coal mining machine cutting speed is v, the spray time is t, the spray coverage length is l, the drum diameter is D, and the hydraulic support width is H. The geometric relationship between the above process parameters is utilized to ensure that the coal mining machine drum is always in a state of being wrapped in the mist flow during the process of moving and cutting coal. This method can be used to quickly determine the main process parameters of the coal mining machine tracking spray, such as the number of sprays and the spray time that are turned on simultaneously. It can help to quickly set the main dust reduction parameters of the tracking spray on site, effectively control and settle the dust generated by the coal mining machine cutting coal, and realize convenient, fast and efficient protection of the health of the operators.

Description

Technical Field

[0001] The invention belongs to the field of dust reduction technology and relates to a method for determining tracking spray process parameters of a fully mechanized face coal mining machine. Background Art

[0002] Coal cutting dust is the main source of dust in fully mechanized mining working faces. Near the shearer drum, a large amount of dust is generated due to the friction between the drum picks and the coal. Combined with the shearer's moving speed and the wind flow at the working face, the dust generated by cutting coal is rapidly spread throughout the mining area with the wind flow. The total instantaneous dust concentration in this area can reach up to 1000mg / m 3 The above factors seriously threaten the safe production of mines and the physical and mental health of workers.

[0003] For this part of dust, real-time tracking drum spray is currently the main method for dust reduction caused by coal cutting. However, due to the different production conditions of each fully mechanized mining face in each mine, the size of the coal mining machine drum, the width of the bracket, the coal cutting speed, etc. are all different, resulting in the inability to accurately determine important parameters such as the number of spray groups and the spray time of the tracking spray, making it impossible for the tracking spray to achieve the purpose of completely covering the drum cutting area in real time, and the dust reduction efficiency of the tracking spray is greatly reduced. At present, most of the methods for addressing this phenomenon are to set the spray parameters on site multiple times and roughly determine the spray quantity and spray time through observation methods, which is somewhat blind. There is no method to quickly determine the process parameters for the initial spray parameter setting. Therefore, it is necessary to invent a calculation method for the main process parameters of tracking spray suitable for different working conditions, so as to quickly determine the optimal tracking spray process parameters. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for determining the process parameters of tracking spray of a coal mining machine on a fully-mechanized mining face, which is suitable for the control of dust generated by the drum cutting coal of a coal mining machine on a fully-mechanized mining face in underground coal mines. This method is suitable for determining the main process parameters of tracking spray under different working conditions. The calculation is simple and fast, and the rapid determination of the process parameters of tracking spray dust reduction is realized, providing technical guidance for on-site application of tracking spray dust reduction.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for determining the process parameters of tracking spraying for a fully mechanized coal mining face is disclosed. The coal mining face is driven by a drum to move and cut coal. A plurality of linearly arranged hydraulic supports are provided above the coal mining face. Sprays are evenly distributed within the hydraulic supports. The number of spray groups in operation is n, the coal mining face cutting speed is v, the spraying time is t, the spraying coverage length is l, the drum diameter is D, and the hydraulic support width is H. The geometric relationship between the above process parameters is utilized to ensure that the coal mining face drum is always surrounded by the mist flow during the moving coal cutting process.

[0007] Optionally, rollers are provided in front and at the rear of the coal mining machine, and one of the rollers travels on a hydraulic support.

[0008] Optionally, specific process parameters are determined by the following formula:

[0009]

[0010] Optionally, the geometric relationship between the process parameters is used to determine the minimum number of spray groups and the spray time to ensure that the spray coverage area is not less than the drum diameter.

[0011] Optionally, the number of spray groups is directly proportional to the coal cutting speed and spraying time of the coal shearer. The faster the coal cutting speed, the more spray groups need to be opened.

[0012] Optionally, the shearer drum diameter, hydraulic support width, and shearer coal cutting speed are determined based on the shearer model of the fully mechanized mining face, the hydraulic support model, and the actual set shearer speed.

[0013] Optionally, the spray coverage length is a measured value of the nozzle at a specific spray pressure, which can be determined by referring to nozzle type parameters or on-site measurements.

[0014] The beneficial effects of the present invention are:

[0015] This method can be used to quickly determine the main process parameters of the coal mining machine tracking spray, such as the number of sprays and spray time that are turned on simultaneously. It can help to quickly set the main dust reduction parameters of the tracking spray on site, effectively control and settle the dust generated by the coal mining machine cutting coal, and achieve convenient, fast and efficient protection of the health of the workers.

[0016] The method for quickly determining the process parameters of the tracking spray of a coal mining machine on a fully mechanized mining face is simple to calculate, convenient and quick, and solves the problem of difficulty in determining the parameters of the tracking spray of the dust source of the coal mining machine. It can quickly provide guidance for the use of tracking spray on the fully mechanized mining working face of the mine, quickly set the tracking spray parameters, protect the health of the workers at the first time, and significantly improve the working environment. After field application tests, after using this method, the dust reduction efficiency of the tracking spray can be sustainably maintained at above 70%, which has good guiding significance and practical value.

[0017] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a schematic diagram of the process parameters involved in the present invention.

[0020] Wherein: n is the number of spray groups; v is the coal cutting speed of the coal mining machine, m / min; t is the spraying time, s; l is the spray coverage length, m; D is the drum diameter, m; H is the width of the hydraulic support, m. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] See also Figure 1The method for quickly determining the process parameters of the shearer tracking spray on the fully mechanized mining face is to use the geometric relationship between the shearer cutting speed v, drum diameter D, hydraulic support width H, nozzle coverage length l, number of tracking spray groups n, spray time t and other parameters to ensure that the shearer drum is always wrapped in the high-pressure mist flow during the moving coal cutting process as the balance point, that is, the length covered by the minimum number of simultaneously opened sprays should not be less than the drum diameter D. A tracking spray process parameter calculation model is established to achieve the rapid determination of the tracking spray dust reduction process parameters for various fully mechanized mining working faces. The specific determination method is as follows:

[0025]

[0026] Where: n is the number of spray groups; v is the coal cutting speed of the coal mining machine, m / min; t is the spraying time, s; l is the nozzle spray coverage length, m; D is the drum diameter, m; H is the width of the hydraulic support, m;

[0027] The number of spray groups n is directly proportional to the coal cutting speed v of the coal mining machine and the spray time t. The faster the coal cutting speed v, the more spray groups n need to be opened to ensure that the spray wraps the drum in real time.

[0028] The shearer drum diameter D, hydraulic support width H, and shearer coal cutting speed v can be determined based on the shearer model, hydraulic support model, and actual shearer speed set for the fully mechanized working face. The nozzle spray coverage length l is the measured value of the nozzle at a specific spray pressure, which can be determined by referring to the nozzle type parameter table or on-site measurement.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for determining process parameters of tracking spraying of a fully mechanized coal mining face, characterized in that: The shearer is driven by a drum to cut coal. Several hydraulic supports are arranged linearly above the shearer. Sprays are evenly distributed within the hydraulic supports. The number of spray groups in operation is n, the shearer cutting speed is v, the spray time is t, the spray coverage length is l, the drum diameter is D, and the hydraulic support width is H. Using the geometric relationship between the above process parameters, the specific process parameters are determined by the following formula: Ensure that the shearer drum is always surrounded by the mist flow during the moving coal cutting process; determine the minimum number of spray groups and spray time to ensure that the spray coverage range is not less than the drum diameter.

2. The method for determining process parameters of tracking spraying for a fully mechanized face coal mining machine according to claim 1, characterized in that: Rollers are installed in front and behind the coal mining machine, and one of the rollers runs on a hydraulic support.

3. The method for determining process parameters of tracking spraying for a fully mechanized face coal mining machine according to claim 1, characterized in that: The number of spray groups is directly proportional to the coal cutting speed and spray time of the coal mining machine. The faster the coal cutting speed, the more spray groups need to be opened.

4. The method for determining process parameters of tracking spraying for a fully mechanized coal mining face according to claim 1, characterized in that: The shearer drum diameter, hydraulic support width, and shearer coal cutting speed are determined according to the shearer model, hydraulic support model, and actual shearer speed set for the fully mechanized mining face.

5. The method for determining process parameters of tracking spraying for a fully mechanized face coal mining machine according to claim 1, characterized in that: The spray coverage length is the measured value of the nozzle at a specific spray pressure. This value can be determined by referring to the nozzle type parameters or on-site measurement.

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