Underground coal mine shaft hydraulic lifting system and lifting system design method

Abstract

The invention belongs to the field of coal mine shaft lifting, and particularly relates to an underground coal mine shaft hydraulic lifting system and a lifting system design method. According to the hydraulic lifting system, an ore taking pond communicated with a lifting shaft is arranged on the ground surface, a sealed cabin is communicated with the lower portion of the lifting shaft, an ore loading roadway is arranged on the upper portion of the sealed cabin in parallel, a gate valve is arranged on the side, close to the lifting shaft, of the sealed cabin, and an opening communicated with the ore loading roadway is formed in the upper portion of the end, away from the lifting shaft, of the sealed cabin; and a push rod is arranged at one end of the sealing bin. The design method comprises the following steps: designing an ore loading container by adopting a streamline revolving body structure, establishing a vertical shaft hydraulic lifting model by utilizing Fluent software by taking the minimum floating resistance of the ore loading container as a target, and carrying out numerical simulation calculation to obtain the ore loading container in a target shape. According to the invention, equipment facilities such as a towering shaft tower, heavy winch mechanical equipment and a thick and strong steel wire rope are cancelled, the investment of a mine is reduced, the operation cost is lower, and the safety is higher.

Description

Technical Field

[0001] The invention belongs to the field of coal mine shaft lifting, and in particular relates to a hydraulic lifting system for an underground coal mine shaft and a lifting system design method. Background Art

[0002] Mine hoisting is one of the main processes in underground coal mining and is also the key to the exploitation of deep coal resources. How to solve the technical, economic and safety problems of mine hoisting has always been the focus of experts, scholars and mining companies. At present, the vertical shaft hoisting method used in mines is mechanical hoisting, that is, hoisting by pulling the skip with wire rope; this hoisting method cannot overcome the shortcomings of reduced hoisting efficiency and increased energy consumption caused by the increase in the deadweight of the wire rope as the mining depth increases. Summary of the invention

[0003] To this end, the present invention proposes a novel hydraulic lifting method, namely, building a lifting shaft sealed on all sides to connect the surface with the bottom of the shaft, referring to the sealing principle of a submarine, building a sealed cabin at the coal bunker at the bottom of the shaft and connected to the lifting shaft, and building a container separation device on the ground of the lifting shaft to transfer the ore-carrying container from the lifting shaft to the unloading place for unloading, thereby eliminating the towering shaft tower, heavy winch machinery and equipment, thick steel wire ropes and other equipment and facilities, reducing mine investment and improving transportation safety.

[0004] Specifically, the present invention proposes a hydraulic lifting system for a shaft of an underground coal mine, comprising a lifting shaft, wherein the upper part of the lifting shaft is connected to the ground surface, an ore-taking pool is arranged on the ground surface, the ore-taking pool is connected to the lifting shaft and the plane range is larger than the lifting shaft; a sealed cabin is connected to one side of the lower part of the lifting shaft, the sealed cabin is a horizontal tunnel, a loading tunnel is arranged in parallel on the upper part of the sealed cabin, the loading tunnel is a horizontal tunnel, and the length of the loading tunnel is greater than the length of the sealed cabin, and the loading tunnel is not connected to the lifting shaft in the horizontal direction. The sealing chamber is connected with the lifting shaft; a gate valve is arranged on the side of the sealing chamber close to the lifting shaft, which is used to open or close the connection between the sealing chamber and the lifting shaft; an opening connected with the ore loading tunnel is arranged on the upper part of one end of the sealing chamber away from the lifting shaft, and a sealing door is arranged on the opening; a push rod is arranged on the end of the sealing chamber away from the lifting shaft, and the push rod is a retractable structure, which is used to push the ore loading container into the lifting shaft; a ore outlet is arranged on the top of one side of the ore loading tunnel away from the sealing chamber; the ore taking pool, the lifting shaft and the sealing chamber are filled with water.

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

[0006] Preferably, the control part for opening and closing the gate valve is located in the ore loading tunnel, and the control part for opening and closing the sealing door is located in the ore loading tunnel.

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

[0008] Preferably, the ore loading container is a sealable device and is not fully filled with coal.

[0009] The present invention also proposes a method for designing a hydraulic lifting system for a vertical shaft of an underground coal mine, comprising the following steps:

[0010] Step 1: Design a suitable shape of ore container

[0011] a. The ore loading container adopts a streamlined rotating body structure, and its rotating body line shape includes a head curve part and a tail curve part. The central axis is the x-axis, and the center of the front end surface of the head curve is the center of the circle as the y-axis perpendicular to the x-axis. The head curve of the ore loading container adopts the Granville double parameter square root polynomial round head line shape, and the dimensionless expression is formula (1). The tail curve adopts the double parameter square polynomial pointed tail line shape, and the dimensionless expression is formula (2);

[0012]

[0013] b. Based on the diameter of the lifting shaft, determine the initial head curve front face diameter, head curve axial length, head curve rear face diameter, tail curve axial length, tail curve rear face diameter for the ore loading container;

[0014] c. Determine the values ​​of several groups of parameters a, b, c, and d, that is, determine several ore-loading containers with different curved shapes; use Fluent software to establish a shaft hydraulic lifting model, the shaft hydraulic lifting model includes a lifting shaft, water, and several ore-loading containers with different curved shapes, and perform numerical simulation calculations to obtain the resistance values ​​of ore-loading containers with different curved shapes; select the values ​​of the group of parameters a, b, c, and d with the smallest floating resistance, and the ore-loading container corresponding to the group of parameters a, b, c, and d is the target ore-loading container shape;

[0015] d. Based on the values ​​of parameters a, b, c, and d determined in step c, a dimensionless head curve and a tail curve are obtained, and the dimensionless head curve and the tail curve are dimensionally converted to obtain the actual required ore loading container.

[0016] Step 2: Construct a lifting system based on the vertical hydraulic lifting system of the underground coal mine described above.

[0017] Preferably, in step a, the dimensionless form of the x value is to divide each x point by the difference between the maximum x value and the minimum x value; the dimensionless form of the 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 reduce the buoyancy resistance, a response surface method is used to further optimize based on the values ​​of several groups of parameters a, b, c, d and their corresponding buoyancy resistances to obtain a more optimal target ore loading container shape.

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

[0020] Beneficial technical effects: 1. The hydraulic lifting system for the vertical shaft of an underground coal mine of the present invention eliminates the towering shaft tower (derrick), heavy winch machinery and equipment, thick wire ropes and other equipment and facilities, reducing the investment in the mine; the system only needs to rely on electric switching gates and sealing doors when it is in operation. Compared with the traditional lifting method that requires continuous power supply for lifting, the electricity cost of the system is basically zero, achieving the goal of green and low-carbon; in terms of safety, there will be no mechanical equipment production accidents such as wire rope breakage and wire rope overwinding that cause tank falling, so the inherent safety of the lifting system is greatly improved.

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

[0022] Figure 1 This is a schematic diagram of the hydraulic lifting system for the shaft of an underground coal mine of the present invention;

[0023] Figure 2 This is a schematic diagram of the rotary structure of the ore loading container of the present invention;

[0024] In the figure, ① is a tower crane, ② is an ore 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. For loading mine tunnel. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. Figure 1As shown, the hydraulic lifting system of the underground coal mine shaft of the present invention includes a lifting shaft 3, the upper part of the lifting shaft 3 is connected to the ground surface, an ore-taking pool is arranged on the ground surface, the ore-taking pool is connected to the lifting shaft 3 and has a range larger than the lifting shaft 3, and a tower crane 1 is arranged outside the ore-taking pool, and the tower crane 1 is used to take out the ore-loading container 2 from the ore-taking pool and transfer it to the unloading place for unloading; a sealed cabin 9 is connected to one side (right side) of the lower part of the lifting shaft 3, and the sealed cabin 9 is formed by a horizontal tunnel arrangement, and a loading tunnel 11 is arranged in parallel on the upper part of the sealed cabin 9, and the loading tunnel 11 is formed by a horizontal tunnel arrangement, and the length of the loading tunnel 11 is greater than the length of the sealed cabin 9, and the loading tunnel 11 is not connected with the lifting shaft 3 in the horizontal direction (left side); a gate valve 7 is arranged on the side (left side) of the sealed cabin 9 close to the lifting shaft 3, which is used to open or close the connection between the sealed cabin 9 and the lifting shaft 3, and the The control part for opening and closing the gate valve 7 is located in the ore-loading tunnel 11. An opening connected to the ore-loading tunnel 11 is arranged at the upper part of one end (right end) of the sealed bin 9 away from the lifting shaft 3. A sealing door 8 is arranged on the opening. The control part for opening and closing the sealing door 8 is located in the ore-loading tunnel 11. A push rod 10 is arranged at one end (right end) of the sealed bin 9 away from the lifting shaft 3. The push rod 10 is a retractable structure for pushing the ore-loading container 2 into the lifting shaft 3. A mine outlet is arranged at the top of one side of the ore-loading tunnel 11 away from the sealed bin 9. A coal feeder 5 is arranged outside the mine outlet. The coal feeder 5 is used to release the mined coal 4 from the mine outlet into the ore-loading container 2. The ore-loading tunnel 11 below the mine outlet serves as the position for loading ore into the ore-loading container 2. The ore-loading container 2 adopts a sealable device and is not full of coal. The ore-taking pool, the lifting shaft 3 and the sealed bin 9 are filled with water 6.

[0026] The lifting process is as follows: coal 4 is loaded into the ore loading container 2, not fully loaded so that its buoyancy is greater than the sum of gravity and resistance, gate valve 7 is closed, sealing door 8 is opened, ore loading container 2 is pushed into the sealing bin 9, sealing door 8 is closed, gate valve 7 is opened, push rod 10 is extended to push ore loading container 2 into the lifting shaft 3, ore loading container 2 floats to the ore taking pool, tower crane 1 is used to take ore loading container 2 out of the ore taking pool and transferred to the unloading place for unloading. Since workers are currently needed to carry out mining operations underground, the empty ore loading container can be lowered from the passage for transporting personnel (such as another shaft).

[0027] The present invention also proposes a design method for a hydraulic lifting system of a vertical shaft of an underground coal mine, comprising the following steps:

[0028] Step 1: Design a suitable shape of ore container, including:

[0029] a. Figure 2As shown, the ore loading container 2 as a whole adopts a streamlined rotating body structure. The streamlined rotating body is obtained by rotating a curve around the central axis. This curve is called the rotating body line shape. The rotating body line shape can be divided into three parts or two parts. The ore loading container 2 of the present invention adopts a two-part structure, namely the head curve part and the tail curve part. F L is the diameter of the front end of the head curve; H is the axial length of the head curve; D is the rear end diameter of the head curve and also the front end diameter of the tail curve; L T is the axial length of the tail curve; D T is the rear end face diameter of the tail curve;

[0030] The central axis is taken as the x-axis, and the center of the front end of the head curve is taken as the center of the circle to make the y-axis perpendicular to the x-axis. The head curve of the ore loading container 2 adopts the Granville double-parameter square root polynomial round head line type, and the dimensionless expression is shown in formula (1). The tail curve adopts the double-parameter square polynomial pointed tail line type, and the dimensionless expression is shown in formula (2); wherein, the dimensionless form of the x value is each x point divided by the difference between the maximum x value and the minimum x value, and the final dimensionless x value range is 0≤x≤1; the dimensionless form of the y value is each y point divided by the difference between the maximum y value and the minimum y value, and the final dimensionless y value range is 0≤y≤1;

[0031]

[0032] b. Based on the diameter of the lifting shaft 3, determine the initial head curve front face diameter D for the ore container 2 F , Axial length of head curve L H , the rear end diameter of the head curve is also the front end diameter of the tail curve D, the axial length of the tail curve L T , the diameter of the rear end of the tail curve D T ; As in this embodiment, the diameter D of the front end of the head curve F =25dm, axial length of head curve L H =30dm, the rear end diameter of the head curve is also the front end diameter of the tail curve D = 50dm, the axial length of the tail curve L T =30dm, rear end diameter of tail curve D T =25dm;

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

[0034] c. Parameters a, b, c, and d will affect the line type of the head curve and the tail curve, making the designed shape of the ore container 2 different, which in turn leads to different resistances when the ore container 2 is lifted in the water. Taking the minimum floating resistance of the ore container 2 as the optimization goal, the values ​​of 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 container 2 can be obtained;

[0035] First, the values ​​of several groups of parameters a, b, c, and d are determined, that is, several ore-loading containers 2 with different curve shapes are determined; a shaft hydraulic lifting model is established using Fluent software, wherein the shaft hydraulic lifting model includes a lifting shaft, water, and several ore-loading containers with different curve shapes, and numerical simulation calculations are performed to obtain resistance values ​​of ore-loading containers with different curve shapes; the values ​​of the group of parameters a, b, c, and d with the smallest floating resistance are selected, and the ore-loading container 2 corresponding to the group of parameters a, b, c, and d with the smallest floating resistance 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 further optimized based on the values ​​of the above-mentioned several groups of parameters a, b, c, d and their corresponding floating resistance to obtain better values ​​of a, b, c, d and their corresponding target ore loading container shape;

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

[0038] Step 2: Construct a lifting system based on the vertical hydraulic lifting system of the underground coal mine described above.

[0039] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of methods under the inspiration of the present invention. Any technical solution that is the same or similar to that of the present application falls within the protection scope of the present invention.

Claims

1. A hydraulic lifting system for a shaft of an underground coal mine, comprising a lifting shaft, wherein the upper part of the lifting shaft is connected to the ground surface, and characterized in that: An ore-collecting pool is arranged on the surface, the ore-collecting pool is connected with the lifting shaft and the plane range is larger than the lifting shaft; a sealed cabin is connected to one side of the lower part of the lifting shaft, the sealed cabin is a horizontal tunnel, a loading tunnel is arranged in parallel with the upper part of the sealed cabin, the loading tunnel is a horizontal tunnel, and the length of the loading tunnel is greater than the length of the sealed cabin, and the loading tunnel is not connected with the lifting shaft in the horizontal direction; a gate valve is arranged on the side of the sealed cabin close to the lifting shaft, which is used to open or close the connection between the sealed cabin and the lifting shaft, An opening communicating with the ore-loading tunnel is arranged at the upper part of one end of the sealed bin away from the lifting shaft, and a sealed door is arranged on the opening; a push rod is arranged at one end of the sealed bin away from the lifting shaft, and the push rod is a retractable structure, which is used to push the ore-loading container into the lifting shaft; a mine outlet is arranged at the top of one side of the ore-loading tunnel away from the sealed bin, and a coal feeder is arranged outside the mine outlet, and the coal feeder is used to release the mined coal from the mine outlet into the ore-loading container; the ore-taking pool, the lifting shaft and the sealed bin are filled with water.

2. According to the hydraulic lifting system of the underground coal mine shaft according to claim 1, a tower crane is arranged outside the ore-taking pool, and the tower crane is used to take out the ore-loading container from the ore-taking pool and transfer it to the unloading place for unloading.

3. According to the hydraulic lifting system of the underground coal mine shaft in claim 1, the control part for opening and closing the gate valve is located in the ore loading tunnel, and the control part for opening and closing the sealing door is located in the ore loading tunnel.

4. The hydraulic lifting system for a vertical shaft of an underground coal mine according to claim 1, wherein the ore loading container is a sealable device and is not fully filled with coal.

5. A method for designing a hydraulic lifting system for a shaft of an underground coal mine, using the hydraulic lifting system for a shaft of an underground coal mine as claimed in any one of claims 1 to 4, characterized in that: The steps include: Step 1: Design a suitable shape of ore container a. The ore loading container adopts a streamlined rotating body structure, and its rotating body line shape includes a head curve part and a tail curve part. The central axis is the x-axis, and the center of the front end surface of the head curve is the center of the circle as the y-axis perpendicular to the x-axis. The head curve of the ore loading container adopts the Granville double parameter square root polynomial round head line shape, and the dimensionless expression is formula (1). The tail curve adopts the double parameter square polynomial pointed tail line shape, and the dimensionless expression is formula (2); b. Based on the diameter of the lifting shaft, determine the initial head curve front face diameter, head curve axial length, head curve rear face diameter, tail curve axial length, tail curve rear face diameter for the ore loading container; c. Determine the values ​​of several groups of parameters a, b, c, and d, that is, determine several ore-loading containers with different curved shapes; use Fluent software to establish a shaft hydraulic lifting model, the shaft hydraulic lifting model includes a lifting shaft, water, and several ore-loading containers with different curved shapes, and perform numerical simulation calculations to obtain the resistance values ​​of ore-loading containers with different curved shapes; select the values ​​of the group of parameters a, b, c, and d with the smallest floating resistance, and the ore-loading container corresponding to the group of parameters a, b, c, and d is the target ore-loading container shape; d. Based on the values ​​of parameters a, b, c, and d determined in step c, a dimensionless head curve and a tail curve are obtained, and the dimensionless head curve and the tail curve are dimensionally converted to obtain the actual required ore loading container. Step 2: Construct a lifting system based on the vertical hydraulic lifting system of the underground coal mine described above.

6. The method for designing a hydraulic lifting system for a vertical shaft of an underground coal mine according to claim 5, characterized in that: In step a, the dimensionless form of the x value is to divide each x point by the difference between the maximum x value and the minimum x value; the dimensionless form of the y value is to divide each y point by the difference between the maximum y value and the minimum y value.

7. The method for designing a hydraulic lifting system for a vertical shaft of an underground coal mine according to claim 6, characterized in that: In step c, in order to further optimize the shape of the ore loading container to reduce the buoyancy resistance, the response surface method is used to further optimize based on the values ​​of several groups of parameters a, b, c, d and their corresponding buoyancy resistances to obtain a better target ore loading container shape.

8. The method for designing a hydraulic lifting system for a vertical shaft of an underground coal mine according to claim 7, characterized in that: In step d, the dimension of the x value is to multiply each x point by the difference between the maximum x value and the minimum x value, and the dimension of the y value is to multiply each y point by the difference between the maximum y value and the minimum y value.

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