Shaft hydraulic hoisting system for underground coal mine and design method of hoisting system

Abstract

The present application belongs to the field of coal mine shaft hoisting, and particularly relates to a shaft hydraulic hoisting system for underground coal mine and a design method of the hoisting system. The hydraulic hoisting system is provided with a mining pool connected with a hoisting shaft on the ground. A sealed cabin is connected with the lower part of the hoisting shaft. A loading roadway is arranged in parallel on the upper part of the sealed cabin. A gate valve is arranged on the side of the sealed cabin close to the hoisting shaft. An opening connected with the loading roadway is arranged on the upper part of the end of the sealed cabin away from the hoisting shaft. A sealing door is arranged on the opening. A push rod is arranged on the end of the sealed cabin away from the hoisting shaft. The design method comprises the following steps: a streamlined rotary body structure is used to design a loading container, a vertical shaft hydraulic hoisting model is established by using Fluent software, and numerical simulation calculation is performed to obtain a target shape loading container. The present application cancels high-rise shaft towers, heavy winch mechanical equipment and thick steel wire ropes, reduces the investment of the mine, and is safer and lower in operation cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal mine shaft hoisting, and particularly relates to a shaft hydraulic hoisting system for underground coal mine and a design method of the hoisting system. BACKGROUND

[0002] Mine hoisting is one of the main processes of underground coal mining and is also the key to restrict the mining of deep coal resources. How to solve the technical, economic and safety problems of mine hoisting has always been concerned by experts, scholars and mining enterprises. At present, the shaft hoisting method used in mines is mechanical hoisting, that is, the bucket is hoisted by steel wire rope traction. This hoisting method cannot overcome the shortcomings of reduced hoisting efficiency and increased energy consumption caused by the increase of the weight of steel wire rope with the increase of the mining depth of the mine. SUMMARY

[0003] Therefore, the present application proposes a new hydraulic hoisting method, that is, a hoisting shaft is built to connect the ground with the bottom of the shaft, a sealed cabin is built at the coal bunker at the bottom of the shaft according to the principle of submarine sealing, and a container separation device is built at the ground of the hoisting shaft to transfer the ore loading container from the hoisting shaft to the ore unloading place for ore unloading, so as to cancel the high tower, heavy winch mechanical equipment and thick steel wire rope and other equipment and facilities, reduce the investment of the mine and improve the transportation safety.

[0004] Specifically, the present application provides a shaft hydraulic hoisting system for underground coal mine, which comprises a hoisting shaft, the upper part of the hoisting shaft is connected with the ground, a mine taking pool is arranged on the ground, the mine taking pool is communicated with the hoisting shaft and has a larger planar range than the hoisting shaft; one side of the lower part of the hoisting shaft is communicated with a sealed cabin, the sealed cabin is a horizontal roadway, a mine loading roadway is arranged in parallel on the upper part of the sealed cabin, the mine loading roadway is a horizontal roadway, the length of the mine loading roadway is greater than the length of the sealed cabin, and the mine loading roadway is not communicated with the hoisting shaft in the horizontal direction; a gate valve is arranged on the side of the sealed cabin close to the hoisting shaft, which is used to open or close the communication between the sealed cabin and the hoisting shaft, an opening communicated with the mine loading roadway is arranged on the upper part of the end of the sealed cabin away from the hoisting shaft, a sealing door is arranged on the opening, a push rod is arranged on the end of the sealed cabin away from the hoisting shaft, the push rod has a telescopic structure and is used to push the ore loading container out of the hoisting shaft; a mine outlet is arranged on the top of the side of the mine loading roadway away from the sealed cabin; and the mine taking pool, the hoisting shaft and the sealed cabin are filled with water.

[0005] Preferably, a tower crane is arranged outside the mine taking pool, which is used to take the ore loading container from the mine taking pool and transfer it to the ore unloading place for ore unloading.

[0006] Preferably, the control part of the opening and closing of the gate valve is located in the mine loading roadway, and the control part of the opening and closing of the sealing door is located in the mine loading roadway.

[0007] Preferably, a coal feeder is arranged outside the coal mining outlet, and the coal feeder is used to discharge the mined coal from the coal mining outlet into the coal loading container.

[0008] Preferably, the coal loading container is internally empty and is provided with a sealable device.

[0009] The present application also provides a design method of a shaft hydraulic hoisting system for underground coal mines, comprising the following steps:

[0010] Step 1: design a coal loading container with a suitable shape

[0011] a. The coal loading container adopts a streamlined rotary body structure, and the rotary body line type includes a head curve part and a tail curve part. Taking the center axis as the x-axis and the center of the head curve front end surface as the center of the y-axis perpendicular to the x-axis, the head curve of the coal loading container adopts a Grawell double-parameter square root polynomial round head line type, and the dimensionless expression is formula (1). The tail curve adopts a double-parameter square polynomial sharp tail line type, and the dimensionless expression is formula (2).

[0012]

[0013] b. Based on the diameter of the hoisting shaft, the initial head curve front end surface diameter, head curve axial length, head curve rear end surface diameter, tail curve axial length, and tail curve rear end surface diameter of the coal loading container are determined.

[0014] c. The values of a plurality of groups of parameters a, b, c, and d are determined, i.e., a plurality of coal loading containers with different curve shapes are determined. A shaft hydraulic hoisting model is established by using Fluent software, the shaft hydraulic hoisting model includes a hoisting shaft, water, and a plurality of coal loading containers with different curve shapes, numerical simulation calculation is performed to obtain the resistance values of the coal loading containers with different curve shapes, and the values of the parameters a, b, c, and d corresponding to the coal loading container with the minimum floating resistance are selected as the target coal loading container shape.

[0015] d. Based on the values of the parameters a, b, c, and d determined in step c, the dimensionless head curve and tail curve are obtained, and the actual required coal loading container is obtained by dimensioning.

[0016] Step 2: based on the shaft hydraulic hoisting system for underground coal mines described above, the hoisting system is constructed.

[0017] Preferably, in step a, the dimensionless method of x value is to divide each x point by the difference between the maximum x value and the minimum x value; and the dimensionless method of y value is to divide each y point by the difference between the maximum y value and the minimum y value.

[0018] Preferably, in step c, in order to further optimize the shape of the ore loading container to make the floating resistance smaller, the response surface method is further used to optimize the values of the parameters a, b, c and d and the corresponding floating resistance to obtain a more optimal target ore loading container shape.

[0019] Preferably, in step d, the dimension of x is that each x point is multiplied by the difference between the maximum x value and the minimum x value, and the dimension of y is that each y point is multiplied by the difference between the maximum y value and the minimum y value.

[0020] Beneficial technical effects: 1. The shaft hydraulic lifting system of the underground coal mine cancels the high-rise shaft tower (headframe), heavy winch mechanical equipment and thick steel wire rope, reduces the investment of the mine; only needs to rely on the power switch gate and sealing door during system operation, compared with the traditional lifting mode which needs continuous power supply for lifting, the power cost of the system operation is basically zero, and the purpose of green low carbon is achieved; in terms of safety, mechanical equipment production accidents such as steel wire rope rupture and overwinding of steel wire rope do not occur, so that the essential safety of the lifting system is well improved.

[0021] 2. The design method of the shaft hydraulic lifting system of the underground coal mine can have smaller lifting resistance under the same volume, that is, save lifting time, and can lift more ore in the same time. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the shaft hydraulic lifting system of the underground coal mine of the present application;

[0023] Figure 2 It is a schematic diagram of the ore loading container rotary body structure of the present application;

[0024] In the figure, ① is a tower crane, ② is an ore loading container, ③ is a lifting shaft, ④ is coal, ⑤ is a coal feeder, ⑥ is water, ⑦ is a gate valve, ⑧ is a sealing door, ⑨ is a sealing cabin, and ⑩ is a push rod, It is an ore loading roadway. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings. As shown in Figure 1As shown, the shaft hydraulic hoisting system of the underground coal mine of the present application comprises a hoisting shaft 3, the upper part of which is connected to the ground, a mining pool is arranged on the ground, the mining pool is in communication with the hoisting shaft 3 and has a range greater than that of the hoisting shaft 3, a tower crane 1 is arranged outside the mining pool, the tower crane 1 is used to take out the ore loading container 2 from the mining pool and transfer it to the ore unloading place for ore unloading, one side (right side) of the lower part of the hoisting shaft 3 is in communication with a sealed cabin 9, the sealed cabin 9 is arranged in a horizontal tunnel, a loading tunnel 11 is arranged in parallel on the upper part of the sealed cabin 9, the loading tunnel 11 is arranged in a horizontal tunnel, and the length of the loading tunnel 11 is greater than that of the sealed cabin 9, the loading tunnel 11 is not in communication with the hoisting shaft 3 in the horizontal direction (left side), a gate valve 7 is arranged on the side (left side) close to the hoisting shaft 3 of the sealed cabin 9, which is used to open or close the communication between the sealed cabin 9 and the hoisting shaft 3, the control part of the opening and closing of the gate valve 7 is located in the loading tunnel 11, an opening in communication with the loading tunnel 11 is arranged on the upper part of the end (right end) of the sealed cabin 9 away from the hoisting shaft 3, a sealing door 8 is arranged on the opening, the control part of the opening and closing of the sealing door 8 is located in the loading tunnel 11, a push rod 10 is arranged on the end (right end) of the sealed cabin 9 away from the hoisting shaft 3, the push rod 10 is a telescopic structure, which is used to push the ore loading container 2 out into the hoisting shaft 3, a mine outlet is arranged on the top of the side of the loading tunnel 11 away from the sealed cabin 9, a coal feeder 5 is arranged outside the mine outlet, the coal feeder 5 is used to put the mined coal 4 out of the mine outlet into the ore loading container 2, the loading tunnel 11 below the mine outlet serves as the position for loading the ore loading container 2, the ore loading container 2 adopts a sealable device and is not filled with coal inside, and the mining pool, the hoisting shaft 3 and the sealed cabin 9 are filled with water 6.

[0026] The lifting process is as follows: the coal 4 is loaded into the ore loading container 2, which is not filled to make the buoyancy greater than the sum of the gravity and the resistance, the gate valve 7 is closed, the sealing door 8 is opened, the ore loading container 2 is pushed into the sealed cabin 9, the sealing door 8 is closed, the gate valve 7 is opened, the push rod 10 is extended to push the ore loading container 2 into the hoisting shaft 3, the ore loading container 2 floats up to the mining pool, and the ore loading container 2 is taken out of the mining pool by the tower crane 1 and transferred to the ore unloading place for ore unloading. Since the underground personnel need to carry out mining operations at present, the empty ore loading container can be lowered from the personnel conveying channel (such as another shaft).

[0027] The present application also provides a design method of the shaft hydraulic hoisting system of the underground coal mine, which comprises the following steps:

[0028] The first step is to design an ore loading container with a suitable shape, which specifically comprises:

[0029] a. As shown in the figure, the ore loading container 2 is a hollow structure, the upper part of the ore loading container 2 is provided with a plurality of ore loading holes 2a, the ore loading holes 2a are arranged in a staggered manner, the ore loading holes 2a are arranged in a staggered manner, and the ore loading holes 2a are arranged in a staggered manner. Figure 2As shown, the ore loading container 2 adopts a whole streamlined body structure. The streamlined body is obtained by rotating a curve around a central axis, and the curve is called a body line type. The body line type can be divided into three parts or two parts. The ore loading container 2 adopts a two-part structure, which is a head curve part and a tail curve part. F D is the head curve front end face diameter; L H is the head curve axial length; D T is the head curve rear end face diameter and also the tail curve front end face diameter; L T is the tail curve axial length; D F is the tail curve rear end face diameter.

[0030] The center axis is taken as the x-axis, and the y-axis perpendicular to the x-axis is made with the center of the head curve front end face as the center. The head curve of the ore loading container 2 adopts a Grawell double-parameter square root polynomial round head line type, and the expression after dimensionless is shown in formula (1). The tail curve adopts a double-parameter square polynomial sharp tail line type, and the expression after dimensionless is shown in formula (2). Wherein, the dimensionless way of x value is that each x point is divided by the difference between the maximum x value and the minimum x value, and the final x value after dimensionless is 0≤x≤1. The dimensionless way of y value is that each y point is divided by the difference between the maximum y value and the minimum y value, and the final y value after dimensionless is 0≤y≤1.

[0031]

[0032] b. Based on the diameter of the lifting shaft 3, the initial head curve front end face diameter D F of the ore loading container 2, the head curve axial length L H , the head curve rear end face diameter which is also the tail curve front end face diameter D, the tail curve axial length L T , and the tail curve rear end face diameter D T are determined; such as the head curve front end face diameter D F = 25 dm, the head curve axial length L H = 30 dm, the head curve rear end face diameter which is also the tail curve front end face diameter D = 50 dm, the tail curve axial length L T = 30 dm, and the tail curve rear end face diameter D T = 25 dm in this embodiment.

[0033] Based on experience, the parameters a, b, c, and d in formula (1) and formula (2) are given a value range. In this embodiment, the value range is 0≤a≤3, 0≤b≤12, 8≤c≤16, and 0≤d≤40.

[0034] c.The parameters a, b, c and d will affect the line type of the head curve and the tail curve, so that the designed ore loading container 2 has different shapes, and the resistance of the ore loading container 2 in the water during the lifting movement is different. Taking the minimum floating resistance of the ore loading container 2 as the optimization goal, the values of the parameters a, b, c and d are determined, and then the line type of the head curve and the tail curve can be obtained, and then the shape of the ore loading container 2 can be obtained;

[0035] Firstly, the values of a plurality of sets of parameters a, b, c and d are determined, that is, a plurality of ore loading containers 2 with different curve shapes are determined; a vertical shaft hydraulic lifting model is established by using Fluent software, the vertical shaft hydraulic lifting model comprises a lifting shaft, water and a plurality of ore loading containers with different curve shapes, numerical simulation calculation is performed to obtain the resistance values of the ore loading containers with different curve shapes; the values of the parameters a, b, c and d corresponding to the minimum floating resistance are selected, and the ore loading container 2 corresponding to the values is the target ore loading container shape;

[0036] Of course, in order to further optimize the shape of the ore loading container to make the floating resistance smaller, the response surface method can be used to further optimize the values of a, b, c and d and the corresponding floating resistance based on the values of the plurality of sets of parameters a, b, c and d and the corresponding floating resistance to obtain more optimal values of a, b, c and d and the corresponding target ore loading container shape;

[0037] d.Based on the values of the parameters a, b, c and d determined in step c, the dimensionless head curve and tail curve are obtained, and the actual required ore loading container is obtained by dimensioning, wherein the dimensioning method of x value is that each x point is multiplied by the difference between the maximum x value and the minimum x value, and finally the dimensionless x value range is 0≤x≤60dm; the dimensioning method of y value is that each y point is multiplied by the difference between the maximum y value and the minimum y value, and finally the dimensionless y value range is 25dm≤y≤50dm;

[0038] Second step: based on the vertical shaft hydraulic lifting system of the underground coal mine described in the foregoing, the lifting system is constructed.

[0039] The present application is not limited to the above-mentioned best embodiment, and anyone can derive other various forms of methods under the inspiration of the present application, as long as the technical solutions are the same or similar to the present application, they fall within the protection scope of the present application.

Claims

1. A method for designing a hydraulic hoisting system of a mine shaft, using a hydraulic hoisting system of a mine shaft, said hoisting system comprising a hoisting shaft, the upper part of which is connected to the surface, characterized in that, A mining pit is constructed on the surface, connected to the hoisting shaft and with a planar area larger than the hoisting shaft. A sealed chamber, a horizontal tunnel, is connected to one side of the lower part of the hoisting shaft. A loading tunnel, also horizontal and longer than the sealed chamber, is parallel to the upper part of the sealed chamber and is not horizontally connected to the hoisting shaft. A gate valve is installed on the side of the sealed chamber closest to the hoisting shaft to open or close the connection between the sealed chamber and the hoisting shaft. An opening communicating with a loading roadway is provided at the upper part of one end of the hoisting shaft. A sealing door is provided on the opening. A push rod is provided at the end of the sealed compartment away from the hoisting shaft. The push rod is a telescopic structure used to push the loading container into the hoisting shaft. A ore outlet is provided at the top of the side of the loading roadway away from the sealed compartment. A coal feeder is provided outside the ore outlet. The coal feeder is used to discharge the mined coal from the ore outlet into the loading container. The ore extraction pool, hoisting shaft, and sealed compartment are filled with water. The feature is that it includes the following steps: Step 1: Design a suitable shape for the ore container a.The ore loading container adopts a streamlined rotary body structure, the rotary body line type of which comprises a head curve portion and a tail curve portion, and the center axis of the ore loading container is taken as the x axis, and the center of the front end face of the head curve is taken as the center of a circle to make a x axis perpendicular to the y axis, the head curve of the ore loading container adopts a Granville double-parameter square root polynomial round head line type, and the expression after non-dimensionalization is formula (1), and the tail curve adopts a double-parameter square polynomial sharp tail line type, and the expression after non-dimensionalization is formula (2); （1） （2） b. Based on the diameter of the hoisting shaft, determine the initial diameter of the front face of the head curve, the axial length of the head curve, the diameter of the rear face of the head curve, the axial length of the tail curve, and the diameter of the rear face of the tail curve for the ore loading container. c. Determine several sets of parameters a, b, c, d The values ​​are determined by identifying several loading containers with different curve shapes; a vertical shaft hydraulic lifting model is established using Fluent software, which includes a lifting shaft, water, and several loading containers with different curve shapes. Numerical simulation calculations are performed to obtain the resistance values ​​of the loading containers with different curve shapes; the set of parameters with the lowest buoyancy resistance is selected. a, b, c, d The value of is the shape of the target ore loading container. d. determining the parameters based on the determination of step c a, b, c, d The dimensionless head curve and tail curve are obtained based on the value of the dimensionless head curve and tail curve, and the dimensionless head curve and tail curve are obtained based on the value of the dimensionless head curve and tail curve. Step 2: Construct a hoisting system based on the hydraulic hoisting system for underground coal mine shafts described above.

2. The design method of the hydraulic hoisting system for underground coal mine shafts according to claim 1, wherein a tower crane is provided outside the ore extraction pool, and the tower crane is used to remove the ore loading container from the ore extraction pool and transfer it to the unloading point for unloading.

3. The design method for a hydraulic hoisting system in a vertical shaft of an underground coal mine according to claim 1, wherein the control part for opening and closing the gate valve is located in the ore loading roadway, and the control part for opening and closing the sealing door is located in the ore loading roadway.

4. The design method for a hydraulic hoisting system in a vertical shaft of an underground coal mine according to claim 1, wherein the ore loading container adopts a sealable device and is not fully loaded with coal.

5. The method of designing a shaft hydraulic hoisting system for a coal mine shaft as claimed in claim 1, wherein, In step a, x The dimensionless way of the values is each x Point divided by the difference of the maximum x Value and the minimum x Value; y The dimensionless way of the values is each y point divided by the maximum y value and the difference of the minimum y value.

6. The method of designing a shaft hydraulic hoisting system for a coal mine shaft according to claim 5, characterised in that, In step c, to further optimize the shape of the ore loading container to make the floating resistance smaller, the response surface method is used to further optimize the values of a plurality of groups of parameters a, b, c, d and their corresponding floating resistances to obtain a more optimal target ore loading container shape.

7. The method of designing a shaft hydraulic hoisting system for a coal mine shaft according to claim 6, characterised in that, In step d, x The dimension of the values is the difference between the maximum x value and the minimum value, multiplied by each point x The dimension of the values is the difference between the maximum x value and the minimum value, multiplied by each point y The dimension of the values is the difference between the maximum y value and the minimum value, multiplied by each point y The dimension of the values is the difference between the maximum y value and the minimum value, multiplied by each point

Images