A gob filling slurry conveying pipeline laying device and method

Abstract

The application discloses a goaf filling slurry conveying pipeline laying device and method. The device comprises a mounting platform, opposite sides of the mounting platform are respectively provided with a first conveying mechanism for conveying a first conveying pipe and a second conveying mechanism for conveying a second conveying pipe, the first conveying mechanism and the second conveying mechanism are the same in structure and are arranged in mirror symmetry, the mounting platform is further provided with a height-adjustable support, the support is provided with a clamping mechanism for clamping the first conveying pipe, the support is further provided with a guide rail, a rotating mechanism is slidably arranged on the guide rail, and the second conveying pipe can be moved under the drive of the rotating mechanism and coaxially connected with the first conveying pipe fixed on the clamping mechanism. The method comprises the following steps: determining a lower limit value of the inner diameter of the filling slurry conveying pipeline according to the ground wellhead pressure limiting, determining an upper limit value of the inner diameter of the filling slurry conveying pipeline according to the filling slurry injection flow, and then selecting a suitable pipeline to quickly complete the laying.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a device and method for laying a slurry conveying pipeline for goaf filling. Background Technology

[0002] Coal, as an important basic energy source and raw material, possesses the dual attributes of energy and resource. In my country, coal deposits are generally complex, and approximately 90% of coal resources are mined underground. After coal mining, goafs are formed underground. If these goafs are not filled, the surface will collapse under the gravity of the overlying strata, forming ground fissures and damaging the ecological environment. To solve this problem, it is often necessary to inject filling grout into the goafs to support the overlying strata.

[0003] In existing technologies, to achieve slurry filling in goaf areas, it is often necessary to construct a connecting shaft on the surface and connect pipelines to the goaf. Then, the filling slurry is transported to the target filling area via a pumping station on the surface. This approach has two drawbacks: firstly, due to the limitations of underground coal mine construction conditions, the bottom of the connecting shaft is generally far from the filling area, requiring long-distance pipeline laying, which consumes a significant amount of time manually; secondly, during slurry transportation, segregation may occur within the pipeline. If the pipeline inner diameter is not properly selected, large particles in the filling slurry can settle and cause pipeline blockage, preventing normal grouting. Therefore, there is an urgent need to develop a filling slurry transportation pipeline laying device and method to solve the problems of low connection and laying efficiency of underground filling slurry transportation pipelines in coal mines, as well as pipeline blockage caused by slurry segregation. Summary of the Invention

[0004] To address the deficiencies and shortcomings of existing technologies, this invention provides a device and method for laying filling slurry transport pipelines in goaf areas, thereby solving the technical problems of time-consuming and labor-intensive laying of filling slurry transport pipelines in coal mines, and the easy blockage of filling slurry transport pipelines due to improper selection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for laying a filling slurry pipeline in a goaf includes an installation platform. On opposite sides of the installation platform are a first conveying mechanism for conveying a first conveying pipe and a second conveying mechanism for conveying a second conveying pipe. The first conveying mechanism and the second conveying mechanism have the same structure and are arranged in a mirror-symmetrical manner.

[0007] The installation platform is also equipped with a height-adjustable support, on which a clamping mechanism for clamping the first conveying pipe is provided. The support is also equipped with a guide rail, on which a rotary mechanism is slidably mounted. The second conveying pipe can move under the drive of the rotary mechanism and coaxially connect with the first conveying pipe fixed on the clamping mechanism.

[0008] Specifically, the rotary mechanism includes a rotary head, a stroke cylinder that drives the rotary head to reciprocate on a guide rail, and a clamp is connected to the front end of the rotary head; the rotary head is also connected to a drive mechanism that can drive the rotary head to rotate.

[0009] Furthermore, the first conveying mechanism includes a shovel plate, a first bracket is fixedly connected to one side wall of the shovel plate, a first drive wheel is mounted on the first bracket, a conveyor belt is wound around the first drive wheel, the other end of the conveyor belt is wound around a second drive wheel, the second drive wheel is mounted on a second bracket, the second bracket is vertically mounted on a support, and a telescopic cylinder is also provided on the side wall of the support, the telescopic end of the telescopic cylinder is connected to the first bracket.

[0010] Furthermore, a tracked vehicle is installed below the installation platform.

[0011] This invention also protects a method for laying a goaf filling slurry conveying pipeline, which is implemented by a goaf filling slurry conveying pipeline laying device, and includes the following steps:

[0012] Step 1: Determine the lower limit of the inner diameter of the filling slurry delivery pipeline based on the pressure limit at the surface wellhead, and determine the upper limit of the inner diameter of the filling slurry delivery pipeline based on the injection flow rate of the filling slurry.

[0013] Step 2: Select a pipe whose inner diameter is greater than the lower limit of the inner diameter of the filling slurry conveying pipe and less than the upper limit of the inner diameter of the filling slurry conveying pipe as the filling slurry conveying pipe.

[0014] Step 3: Use the goaf filling slurry conveying pipeline laying device to complete the rapid laying of the slurry pressure conveying pipeline in the coal mine.

[0015] Furthermore, the lower limit of the inner diameter of the filling slurry conveying pipeline mentioned in step 1 is determined by the following formula:

[0016]

[0017] In the formula,

[0018] D min This refers to the lower limit of the inner diameter of the filling slurry conveying pipeline, in meters (m).

[0019] ρ is the density of the filling slurry, in kg / m³. 3;

[0020] λ is the friction coefficient of the filling slurry conveying pipeline, which is dimensionless;

[0021] L represents the total length of the filling slurry conveying pipeline, in meters (m).

[0022] Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s;

[0023] P f管路 The frictional resistance of the filling slurry conveying pipeline is measured in Pa.

[0024] Furthermore, the pipe friction of the filling slurry conveying pipe is determined by the following formula:

[0025] P f管路 =P 井口 -P f贯通井 +P 静液柱

[0026] In the formula,

[0027] P 井口 This is the pressure limit at the surface wellhead, measured in Pa.

[0028] P f贯通井 Frictional resistance along the flow path of filling slurry within the wellbore of a surface-connected well, expressed in Pa;

[0029] P 静液柱 The hydrostatic pressure, expressed in Pa, is the pressure generated by the elevation difference between the surface and the slurry outlet in the coal mine. Furthermore, the upper limit of the inner diameter of the filling slurry conveying pipeline described in step 1 is determined by the following formula: when the average particle size d of the solid particles in the filling slurry is ≤ 50 × 10⁻⁶... -6 m time:

[0030]

[0031] When the average particle size d of the solid particles in the filling slurry is greater than 50×10 -6 m time:

[0032]

[0033] In the formula,

[0034] D max This is the upper limit of the inner diameter of the filling slurry conveying pipeline, in meters (m).

[0035] Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s;

[0036] C is the volume concentration of solid particles in the filling slurry, which is dimensionless;

[0037] d represents the average particle size of the solid particles in the filling slurry, in meters (m).

[0038] g is the acceleration due to gravity, and its unit is m / s². 2 ;

[0039] s is the ratio of the density of solid particles in the filling slurry to the density of the filling slurry, which is dimensionless;

[0040] v t This represents the settling velocity of solid particles in the filling slurry in still water, expressed in m / s.

[0041] Furthermore, the settling velocity v of the solid particles in the filling slurry in still water... t Determined by the following formula:

[0042]

[0043] In the formula,

[0044] ρ p The density of solid particles in the filling slurry, kg / m³ 3 ;

[0045] ρ l The density of the filling slurry is kg / m³. 3 ;

[0046] d represents the average particle size of solid particles in the filling slurry, in meters (m).

[0047] μ is the viscosity of the filling slurry, in Pa·s.

[0048] Compared with the prior art, the beneficial technical effects of this invention are:

[0049] (1) The device of the present invention relies on mechanical rotation to connect the pipeline, which can effectively reduce the labor intensity of underground workers in coal mines, reduce the time for laying filling slurry pipelines, and improve pipeline connection efficiency.

[0050] (2) The method of the present invention takes into account the injection capacity of the ground filling slurry pump station and the flow rate required for the filling slurry to carry solid particles without settling. Therefore, when filling the slurry, a suitable filling slurry conveying pipeline is selected, which can not only ensure the safe injection of the slurry, but also avoid the settling of solid particles in the slurry during the conveying process, which would cause pipeline blockage. This provides a theoretical method for the selection of conveying pipelines in the present invention. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of the filling slurry conveying pipeline laying device of the present invention;

[0052] Figure 2This is a schematic diagram of the pipe connection process of the device of the present invention;

[0053] Figure 3 This is a flowchart of the method of the present invention.

[0054] The numbers in the diagram represent:

[0055] 1- Mounting platform; 2- First conveying pipe; 3- First conveying mechanism; 4- Second conveying pipe; 5- Second conveying mechanism; 6- Support; 7- Clamping mechanism; 8- Guide rail; 9- Rotation mechanism; 10- Telescopic cylinder; 11- Tracked vehicle; 31- Shovel; 32- First support; 33- First drive wheel; 34- Conveyor belt; 35- Second drive wheel; 36- Second support; 91- Rotary head; 92- Stroke cylinder; 93- Drive mechanism.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0057] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention. The present invention will be further described in detail below with reference to the embodiments.

[0058] In the description of orientation in this invention, the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate orientation or positional relationships only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] 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 one or more of that feature. Unless otherwise stated, the terms "installed," "connected," "joined," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] Unless otherwise specified, all components in this invention are commercially available.

[0061] Example 1

[0062] Following the above technical solution, this embodiment provides a device for laying a filling slurry pipeline in a goaf, including an installation platform 1. On opposite sides of the installation platform 1, there are a first conveying mechanism 3 for conveying a first conveying pipe 2 and a second conveying mechanism 5 for conveying a second conveying pipe 4. The first conveying mechanism 3 and the second conveying mechanism 5 have the same structure and are arranged in a mirror-symmetrical manner.

[0063] The installation platform 1 is also equipped with a height-adjustable support 6. The support 6 is equipped with a clamping mechanism 7 for clamping the first conveying pipe 2. The support 6 is also equipped with a guide rail 8, which extends along the length of the support 6 and the length of the guide rail 8 is equal to the length of the support 6. A rotary mechanism 9 is slidably mounted on the guide rail 8. The rotary mechanism 9 can reciprocate along the guide rail 8. The second conveying pipe 4 can move under the drive of the rotary mechanism 9 and coaxially connect with the first conveying pipe 2 fixed on the clamping mechanism 7.

[0064] The second conveying pipe 4 and the first conveying pipe 2 can be connected by a threaded connection.

[0065] As a preferred embodiment, the rotary mechanism 9 includes a rotary unit 91, a stroke cylinder 92 that drives the rotary unit 91 to reciprocate on the guide rail 8, and a clamp is connected to the front end of the rotary unit 91; a drive mechanism 93 that can drive the rotary unit 91 to rotate is also connected to the rotary unit 91.

[0066] As a preferred embodiment, the first conveying mechanism 3 includes a shovel plate 31, a first bracket 32 ​​is fixedly connected to one side wall of the shovel plate 31, a first transmission wheel 33 is mounted on the first bracket 32, a conveyor belt 34 is wound around the first transmission wheel 33, the other end of the conveyor belt 34 is wound around a second transmission wheel 35, the second transmission wheel 35 is mounted on a second bracket 36, the second bracket 36 is vertically mounted on a support 6, and a telescopic cylinder 10 is also provided on the side wall of the support 6, the telescopic end of the telescopic cylinder 10 is connected to the first bracket 32.

[0067] As a preferred embodiment, a tracked vehicle 12 is provided below the installation platform 1, which is used to move the device.

[0068] The procedure for using this device is as follows:

[0069] (1) Pipeline transportation: The worker places the second conveying pipe 4 to be connected on the second conveying mechanism 5, starts the second conveying mechanism 5, and transports the second conveying pipe 4 towards the installation platform 1;

[0070] (2) Pipe clamping: After straightening the second conveying pipe 4, send it into the rotary device 91, adjust the second conveying pipe 4 to a near-horizontal state, start the rotary device 91, and clamp the second conveying pipe 4 tightly.

[0071] (3) Pipeline connection: The pipeline laying device relies on the tracked vehicle 11 to... Figure 1 The device moves to the right until it reaches the connected pipe. The first conveying mechanism 3 lifts the connected first conveying pipe 2 to a near-horizontal position, straightens it, and sends it into the clamping mechanism 7. The rotary device 91 moves along the guide rail 8 toward the clamping mechanism 7. After the second conveying pipe 4 and the first conveying pipe 2 are coaxially connected, the rotary device 91 is started to rotate the second conveying pipe 4 so that it is tightly connected to the first conveying pipe 2 by threads.

[0072] (4) Lowering the pipe: After the pipe is connected, release the clamping mechanism 7, the rotary device 91 grips the second conveying pipe 4 and moves along the slide rail 8, pushing the connected pipe to the right and lowering it to the roadway ground.

[0073] (5) Move the pipeline laying device, manually place the new pipeline to be connected, and repeat the above steps until the rapid connection of the filling slurry pipeline is completed.

[0074] Example 2

[0075] Following the above technical solutions, such as Figure 3 As shown in the figure, this embodiment discloses a method for laying a goaf filling slurry conveying pipeline. This method is implemented using a goaf filling slurry conveying pipeline laying device, and includes the following steps:

[0076] Step 1: Determine the lower limit of the inner diameter of the filling slurry delivery pipeline based on the pressure limit at the surface wellhead, and determine the upper limit of the inner diameter of the filling slurry delivery pipeline based on the injection flow rate of the filling slurry.

[0077] Furthermore, the lower limit of the inner diameter of the filling slurry conveying pipeline mentioned in step 1 is determined by the following formula:

[0078]

[0079] In the formula,

[0080] D min This refers to the lower limit of the inner diameter of the filling slurry conveying pipeline, in meters (m).

[0081] ρ is the density of the filling slurry, in kg / m³. 3 ;

[0082] λ is the friction coefficient of the filling slurry conveying pipeline, which is dimensionless;

[0083] L represents the total length of the filling slurry conveying pipeline, in meters (m).

[0084] Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s.

[0085] Furthermore, the pipe friction of the filling slurry conveying pipe is determined by the following formula:

[0086] P f管路 =P 井口 -P f贯通井 +P 静液柱

[0087] In the formula,

[0088] P 井口 This is the pressure limit at the surface wellhead, measured in Pa.

[0089] P f贯通井 Frictional resistance along the flow path of filling slurry within the wellbore of a surface-connected well, expressed in Pa;

[0090] P 静液柱 The hydrostatic pressure generated by the elevation difference between the ground surface and the slurry outlet in the underground coal mine is expressed in Pa.

[0091] Among them, P 井口 Determined based on the pressure resistance rating of the wellhead equipment and the maximum allowable pressure of the surface fracturing skid or surface fracturing pump truck; P f贯通井 It is determined by calculation using formulas for calculating the frictional resistance of pipe flow (such as the Darcy-Weisbach formula).

[0092] Furthermore, the upper limit of the inner diameter of the filling slurry conveying pipe mentioned in step 1 is determined by the following formula:

[0093] When the average particle size d of the solid particles in the filling slurry is ≤50×10 -6 m time:

[0094]

[0095] When the average particle size d of the solid particles in the filling slurry is greater than 50×10 -6 m time:

[0096]

[0097] In the formula,

[0098] D max This is the upper limit of the inner diameter of the filling slurry conveying pipeline, in meters (m).

[0099] Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s;

[0100] C is the volume concentration of solid particles in the filling slurry, which is dimensionless;

[0101] d represents the average particle size of the solid particles in the filling slurry, in meters (m).

[0102] g is the acceleration due to gravity, and its unit is m / s². 2 ;

[0103] s is the ratio of the density of solid particles in the filling slurry to the density of the filling slurry, which is dimensionless;

[0104] v t This refers to the settling velocity of solid particles in the filling slurry in still water, expressed in m / s.

[0105] Furthermore, the settling velocity v of the solid particles in the filling slurry in still water... t Determined by the following formula:

[0106]

[0107] In the formula,

[0108] ρ p The density of solid particles in the filling slurry, kg / m³ 3 ;

[0109] ρ l The density of the filling slurry is kg / m³. 3 ;

[0110] d represents the average particle size of solid particles in the filling slurry, in meters (m).

[0111] μ is the viscosity of the filling slurry, in Pa·s.

[0112] Step 2: Select a pipe whose inner diameter is greater than the lower limit of the inner diameter of the filling slurry conveying pipe and less than the upper limit of the inner diameter of the filling slurry conveying pipe as the filling slurry conveying pipe.

[0113] Step 3: Use the goaf filling slurry conveying pipeline laying device to complete the rapid laying of the slurry pressure conveying pipeline in the coal mine.

[0114] In the above description, unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections, etc. Those skilled in the art can understand the specific meaning of the above terms in this technical solution according to the specific circumstances.

[0115] The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction, as long as they do not violate the spirit of the present invention, and should also be regarded as the content disclosed by the present invention.

Claims

1. A method for laying a slurry conveying pipeline for filling goaf, characterized in that, This method is achieved through a goaf filling slurry conveying pipeline laying device. The goaf filling slurry conveying pipeline laying device includes an installation platform (1). On opposite sides of the installation platform (1) are respectively a first conveying mechanism (3) for conveying the first conveying pipe (2) and a second conveying mechanism (5) for conveying the second conveying pipe (4). The first conveying mechanism (3) and the second conveying mechanism (5) have the same structure and are arranged in a mirror-symmetrical manner. The installation platform (1) is also provided with a height-adjustable support (6), and the support (6) is provided with a clamping mechanism (7) for clamping the first conveying pipe (2). The support (6) is also provided with a guide rail (8), and a rotary mechanism (9) is slidably provided on the guide rail (8). The second conveying pipe (4) can move under the drive of the rotary mechanism (9) and coaxially connect with the first conveying pipe (2) fixed on the clamping mechanism (7). The method includes the following steps: Step 1: Determine the lower limit of the inner diameter of the filling slurry delivery pipeline based on the pressure limit at the surface wellhead, and determine the upper limit of the inner diameter of the filling slurry delivery pipeline based on the injection flow rate of the filling slurry. Step 2: Select a pipe whose inner diameter is greater than the lower limit of the inner diameter of the filling slurry conveying pipe and less than the upper limit of the inner diameter of the filling slurry conveying pipe as the filling slurry conveying pipe. Step 3: Use the goaf filling slurry conveying pipeline laying device to complete the rapid laying of the filling slurry conveying pipeline in the coal mine; The lower limit of the inner diameter of the filling slurry conveying pipeline mentioned in step 1 is determined by the following formula: In the formula, D min This refers to the lower limit of the inner diameter of the filling slurry conveying pipeline, in meters (m). ρ is the density of the filling slurry, in kg / m³. 3 ; λ is the friction coefficient of the filling slurry conveying pipeline, which is dimensionless; L represents the total length of the filling slurry conveying pipeline, in meters (m). Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s; P f管路 The frictional resistance of the filling slurry conveying pipeline, measured in Pa; The upper limit of the inner diameter of the filling slurry conveying pipeline mentioned in step 1 is determined by the following formula: When the average particle size d of the solid particles in the filling slurry is ≤50×10 -6 m time: When the average particle size d of the solid particles in the filling slurry is greater than 50×10 -6 m time: In the formula, D max This is the upper limit of the inner diameter of the filling slurry conveying pipeline, in meters (m). Q represents the injection flow rate of the filling slurry, in meters per second (m³). 3 / s; C is the volume concentration of solid particles in the filling slurry, which is dimensionless; d represents the average particle size of the solid particles in the filling slurry, in meters (m). g is the acceleration due to gravity, and its unit is m / s². 2 ; s is the ratio of the density of solid particles in the filling slurry to the density of the filling slurry, which is dimensionless; v t This represents the settling velocity of solid particles in the filling slurry in still water, expressed in m / s.

2. The method for laying a slurry conveying pipeline for goaf filling as described in claim 1, characterized in that, The rotary mechanism (9) includes a rotary device (91) and a stroke cylinder (92) that drives the rotary device (91) to reciprocate on the guide rail (8). A clamp (93) is also connected to the front end of the rotary device (91). A drive mechanism that can drive the rotary device (91) to rotate is also connected to the rotary device (91).

3. The method for laying a slurry conveying pipeline for goaf filling as described in claim 1, characterized in that, The first conveying mechanism (3) includes a shovel plate (31), a first bracket (32) is fixedly connected to one side wall of the shovel plate (31), a first transmission wheel (33) is installed on the first bracket (32), a conveyor belt (34) is wound on the first transmission wheel (33), the other end of the conveyor belt (34) is wound on a second transmission wheel (35), the second transmission wheel (35) is installed on a second bracket (36), the second bracket (36) is vertically set on a support (6), and a telescopic cylinder (10) is also provided on the side wall of the support (6), the telescopic end of the telescopic cylinder (10) is connected to the first bracket (32).

4. The method for laying a slurry conveying pipeline for goaf filling as described in claim 1, characterized in that, A tracked vehicle (11) is installed below the installation platform (1).

5. The method for laying a slurry conveying pipeline for goaf filling as described in claim 1, characterized in that, The pipe friction of the filling slurry conveying pipeline is determined by the following formula: P f管路 =P 井口 -P f贯通井 +P 静液柱 In the formula, P 井口 This is the pressure limit at the surface wellhead, measured in Pa. P f贯通井 Frictional resistance along the flow path of filling slurry within the wellbore of a surface-connected well, expressed in Pa; P 静液柱 The hydrostatic pressure generated by the elevation difference between the ground surface and the slurry outlet in the underground coal mine is expressed in Pa.

6. The method for laying a slurry conveying pipeline for goaf filling as described in claim 1, characterized in that, The settling velocity v of the solid particles in the filling slurry in still water t Determined by the following formula: In the formula, ρ p The density of solid particles in the filling slurry, kg / m³ 3 ; ρ l The density of the filling slurry is kg / m³. 3 ; d represents the average particle size of solid particles in the filling slurry, in meters (m). μ is the viscosity of the filling slurry, in Pa·s.

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