A mine underground damping type regulating air door and a use method thereof

Abstract

The present application aims to provide a kind of coal mine underground damping type regulating air door and its using method, belong to coal mine underground ventilation technical field, including air door body, the window frame is equipped on the air door body, the outer end of air door body is equipped with shell, one end of window frame is hinged with air door body by hinge, the other end is connected with shell by window lock, a plurality of layers of damping net are equipped between window frame and shell, the outside of damping net is equipped with inner frame body, the upper and lower ends of window frame are equipped with slide rail, the slide rail includes the outer slide rail located in the outside of air door body and the inner slide rail located in the inside of air door body, the inner frame body is slidably connected with slide rail, the bottom of the inner frame body is equipped with control assembly.Damping type regulating air door, air flow area is large, and is flexible to block, air flow is not easy to penetrate to the coal body around air door, the probability of coal spontaneous combustion accident is greatly reduced, and the air volume regulating range is large, especially suitable for the area that air volume changes greatly.

Description

Technical Field

[0001] This invention belongs to the field of underground ventilation technology in coal mines, specifically relating to an underground damping regulating damper and its usage method. Background Technology

[0002] Mine ventilation is a crucial aspect of coal production. During underground mining operations, each roadway requires a certain amount of ventilation to ensure the smooth operation of various tasks. Air doors and windows need to be installed at appropriate locations in the roadways to regulate airflow. Currently, traditional rigid air doors in underground mines tend to obstruct airflow when adjusting it, easily increasing the pressure difference between the upper and lower sides and causing air leakage near the door frame. Furthermore, during the installation and construction of ventilation structures, cracks of a certain width can easily form near the door frame. Over time, the accumulated obstruction of airflow creates suitable oxidative heat storage conditions for the nearby coal, increasing the risk of spontaneous combustion. This poses a serious hazard to underground mining operations.

[0003] Damped mesh windshields utilize the damping principle to regulate airflow. As fluid passes through the mesh surface, friction occurs, which leads to the formation of a boundary layer. This increases effective contraction, resulting in a pressure reduction and thus generating local resistance loss. Furthermore, the local resistance generated when fluid passes through the damped mesh is determined by the mesh size, and the flow rate through the damped mesh is primarily a function of porosity. Summary of the Invention

[0004] The purpose of this invention is to provide a damped regulating air door for underground coal mines and its usage method. The air door frame has a sliding damping mesh. When air volume adjustment is required, the ventilation porosity of the air door is changed by sliding the damping mesh in a superimposed manner, so as to quickly adjust the air volume, prevent airflow obstruction and accumulation, avoid coal spontaneous combustion accidents, and ensure the smooth progress of underground mining operations to a certain extent.

[0005] The present invention adopts the following technical solution:

[0006] A damping regulating damper for underground coal mines includes a damper body with a window frame on the damper body. A housing is provided at the outer end of the damper body. One end of the window frame is hinged to the damper body via a hinge, and the other end is connected to the housing via a window lock. Several layers of damping mesh are provided between the window frame and the housing. An inner frame is provided outside the damping mesh. Slide rails are provided at the upper and lower ends of the window frame. The slide rails include an outer slide rail located outside the damper body and an inner slide rail located inside the damper body. The inner frame is slidably connected to the slide rails. A control component is provided at the bottom of the inner frame.

[0007] Furthermore, the damping mesh comprises three parallel layers of damping meshes with different porosities, with a spacing of 6 cm between the damping meshes.

[0008] Furthermore, the distance between the end of the damping mesh and the end closest to the shell is 3cm.

[0009] Furthermore, the inner frame has grooves at both the upper and lower ends, and anti-static strips are provided in the grooves.

[0010] Furthermore, a scale strip is provided at the bottom of the inner frame.

[0011] Furthermore, the control component includes a plug, a fixing rod, an outer frame strip, and a connecting block. One end of the plug is close to the slide rail end and connected to the slide rail via an anti-static strip. The other end is connected to the inner frame. The outer frame strip is connected to the end of the plug near the housing. The fixing rod is connected to the end of the outer frame strip near the housing. The fixing rod passes through the outer frame strip and connects to the plug. The outer frame strip fits snugly against the inner frame. A handle is provided at the center line of the outer frame strip. The handle passes through the outer frame strip and connects to the inner frame. A connecting block is provided at the end of the outer frame strip away from the inner frame. One end of the connecting block is provided with a pivot, one end of which is connected to a connecting rod. One end of the connecting rod is connected to a pivot, one end of which is connected to a connecting rod. The free end of the connecting rod is provided with a slot.

[0012] Furthermore, the horizontal angle of the first rotating shaft is tilted at 45°, and the second rotating shaft can rotate 360°.

[0013] A method for using a damping regulating air door in an underground coal mine includes the following steps:

[0014] The first step is to calculate and determine the air volume in the parallel ventilation network and determine the position of the regulating damper:

[0015] h1=R1Q1 2 h2=R2Q2 2 Where h1 represents the first branch resistance, pa; R1 represents the first branch wind resistance, N·s 2 / m 8 Q1 represents the air volume of the first branch, in meters. 3 h2 represents the drag of the second branch, Pa; R2 represents the wind resistance of the second branch, N·s 2 / m 8 Q2 represents the air volume of the second branch, in meters. 3 .

[0016] The position of the regulating damper is determined based on the magnitude of the local resistance in the parallel air network.

[0017] The second step is to calculate the local drag loss of the airflow passing through the damping king:

[0018] Where: ΔP represents the local resistance of the airflow passing through the damping mesh, Pa; μ represents the dynamic viscosity of the fluid, Pa / s; K1 represents the permeability of the fluid flowing through the damping mesh, m 3 / (sm2 ); u represents the velocity of the fluid passing through the damping mesh, m / s; ρ represents the density of the fluid, kg / m³. 3 Y1 represents the inertia factor of the damping mesh; L represents the thickness of the damping mesh, in meters (m).

[0019] Where ω represents the porosity of the damping mesh, % .

[0020] The third step is to set up three layers of damping nets to regulate the air volume. Based on the local resistance obtained from the air volume distribution, determine how many layers of damping nets to arrange to regulate the air volume of the parallel air network.

[0021] This invention utilizes an adjustable three-layer superimposed damping net to regulate the airflow in a roadway. During the regulation process, precise control is achieved based on the required airflow within the roadway. When the airflow is small, only one layer of damping net can be installed to increase local resistance within the roadway; when the airflow is large, two or more layers of damping net can be superimposed to increase the pressure drop as the airflow passes through. During the airflow regulation process, the damping net does not necessarily need to completely cover its cross-section; it can be set at an appropriate scale position according to the airflow regulation requirements to achieve precise airflow control.

[0022] Compared with traditional underground ventilation doors and windows, the advantages of the damped regulating air door in coal mines of the present invention are as follows: three sets of parallel damping mesh windows are set inside the air door window, and the windows are slidably adjusted by the sliding components outside the damping mesh. The air volume in the mine is adjusted by adjusting the porosity of the superimposed damping mesh, and the damping mesh can be covered to the scale strip outside the damping mesh to achieve precise adjustment of the air volume.

[0023] Damped regulating dampers have a large cross-sectional area for airflow regulation and are flexible barriers, making it difficult for airflow to penetrate into the coal body around the damper. This greatly reduces the probability of coal spontaneous combustion accidents. In addition, they have a wide range of airflow regulation and are particularly suitable for areas where airflow needs to vary greatly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the damping mesh structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the control component of the present invention;

[0028] The components are: 1-Damper body; 2-Shell; 3-Window frame; 4-Damping mesh; 5-Inner slide rail; 6-Outer slide rail; 7-Hinge; 8-Window lock; 9-Inner frame; 10-Antistatic weatherstripping; 11-Scale strip; 12-Plug-in; 13-Fixing rod; 14-Outer frame strip; 15-Handle; 16-Connecting block; 17-Shaft one; 18-Connecting rod one; 19-Shaft two; 20-Connecting rod two; 21-Slot. Detailed Implementation

[0029] The invention will be further described with reference to the accompanying drawings.

[0030] A damping regulating damper for underground coal mines includes a damper body 1, a window frame 3 on the damper body 1, a housing 2 at the outer end of the damper body 1, one end of the window frame 3 being hinged to the damper body 1 via a hinge 7, and the other end being connected to the housing 2 via a window lock 8, a plurality of damping meshes 4 being provided between the window frame 3 and the housing 2, an inner frame 9 being provided on the outer side of the damping meshes 4, and slide rails being provided at the upper and lower ends of the window frame 3, the slide rails including an outer slide rail 6 located on the outer side of the damper body 1 and an inner slide rail 5 located on the inner side of the damper body 1, the inner frame 9 being slidably connected to the slide rails, and a control component being provided at the bottom of the inner frame 9.

[0031] The damping net 4 can be moved into the interior of the damper body 1 via the external slide rail 6.

[0032] The window lock 8 is fixed to the housing 2 and the window frame 3 with screws. The window lock 8 controls the closing of the housing 2. The housing 2 and the damping net 4 are not under the same frame, so that the closing of the housing 2 will not affect the ability of the underground ventilation window to regulate the air volume and wind speed.

[0033] The damping mesh 4 is woven using a flat weave method, with a porosity ranging from 0.04 to 0.88. At a wind speed of 2.5 m / s, the maximum local resistance of a single-layer damping mesh is >1000 Pa, and the minimum local resistance is <120 Pa. By setting three sets of damping mesh 4 with different porosities, airflow regulation can be achieved. When airflow passes through the three sets of damping mesh 4 with different porosities, the amount of airflow passing through will change.

[0034] As a damping regulating air door for underground coal mines according to the present invention, the following steps are included:

[0035] (1) Calculate and determine the location of the air volume regulating air network in the parallel air network.

[0036] Assume that the air resistance of each branch of a parallel ventilation network in a mine is R1 = 1.186 N·s. 2 / m 8 R² = 0.794 N·s 2 / m 8 The total air volume is 40m³. 3 The first branch requires an air volume of 13m³.3 The second branch requires an air volume of 27m³. 3 ;

[0037] h1=R1Q1 2 h2=R2Q2 2 ;

[0038] The calculation using the above formula yields h1 = 1.186 N·s. 2 / m 8 ×13 2 m 3 =200.434 Pa, h2 = 0.894 N·s 2 / m 8 ×27 2 m 3 =651.726Pa, h2>h1, it can be determined by calculation that the position of the damper window is set at the first branch, and the local resistance difference between the two branches is 451.292Pa;

[0039] (2) Calculate the local drag loss of the airflow through the damping net, as follows:

[0040] Where: ΔP represents the local resistance of the airflow passing through the damping mesh, Pa; μ represents the dynamic viscosity of the fluid, Pa / s; K1 represents the permeability of the fluid flowing through the damping mesh, m 3 / (sm 2 ); u represents the velocity of the fluid passing through the damping mesh, m / s; ρ represents the density of the fluid, kg / m³. 3 Y1 represents the inertia factor of the damping mesh; L represents the thickness of the damping mesh, in meters (m).

[0041] The relationship between the inertia factor and permeability, which are related to porosity, is as follows:

[0042] ω represents the porosity of the damping mesh, % .

[0043] Based on the above calculation formula, =1.8×10 5 Pa / s, =1.2kg / m 3 , =5×10 -3 With a wind speed of 2.5 m / s, and damping mesh porosities of 0.66, 0.76, and 0.85, the calculations show that the three layers of damping mesh generate local resistance of 219.89 Pa, 162.76 Pa, and 129.15 Pa, respectively.

[0044] (3) Set up 3 layers of damping nets to regulate the air volume. Specifically, determine how many layers of damping nets to arrange to regulate the air volume of the parallel air network based on the local resistance obtained from the air volume distribution. According to the above calculation, the first two layers of damping nets are set to a full coverage state in the frame, and the air volume regulation of the parallel air network can be achieved when the last layer of damping net covers 54% of its cross-section.

[0045] As a damping regulating air door for underground coal mines according to the present invention, the inner frame base is provided with a scale strip on the outside of the damping mesh 4. The scale strip is divided into 100 grids, and the 100 grids correspond to the specific percentage position where the damping mesh needs to cover the cross section. When the damping mesh does not need to completely cover the cross section corresponding to the damping mesh, it is set at a suitable position where the damping mesh can cover the corresponding cross section. According to the calculation based on the specific example above, the air regulation requirement can be completed when the last layer of damping mesh covers the 54th grid.

[0046] The three inner frames 9 are equipped with control components on the right side of their frames, which can effectively regulate the position of the inner frames 9 inside the damper body 1.

[0047] The control components include a plug 12, a fixing rod 13, an outer frame strip 14, a handle 15, a connecting block 16, a first rotating shaft 17, a first connecting rod 18, a second rotating shaft 19, a second connecting rod 20, and a slot 21. All control components are located near the housing 2. The plug 12 is connected to the slide rail near the end of the slide rail via an anti-static strip 10, and its left end is connected to the inner frame 9. The outer frame strip 14 is connected to the end of the plug 12 near the housing 2, and the end of the outer frame strip 14 near the housing 2 is connected to the fixing rod 13. The fixing rod 13 passes through the outer frame strip 14 and is connected to the plug 12. The outer frame strip 14 fits into the inner frame 9. A handle 15 is provided at the center of the outer frame strip 14. The handle passes through the outer frame strip 14 and connects to the inner frame 9. A connecting block 16 is installed at the end of the outer frame strip 14 away from the fixed inner frame 9. The connecting block 16 is connected to the first rotating shaft 17. The first connecting rod 18 is connected to the second connecting rod 20 through the second rotating shaft 19. A slot 21 is installed at the end of the second connecting rod 20 away from the rotating shaft.

[0048] In this invention, the inner frame 9 can be easily removed and replaced by disassembling the plug 12. At the same time, during the use of the windshield, the slot 21 can be rotated to the position of the slide rail by adjusting the first pivot 17 and the second pivot 18. The width of the slot 21 matches the width of the slide rail, which can restrict the movement of the inner frame and thus achieve the effect of effectively controlling the position of the inner frame.

[0049] The pivot 17 can rotate 45° in the horizontal range, which makes it easy to rotate the connecting rod 18 from the tilt angle to the vertical or horizontal position.

[0050] The second rotating shaft 19 rotates 360° to move the second connecting rod 20 and the slot 21 to the same level as the slide rail, so that the slot 21 can restrict the position of the inner frame on the slide rail.

Claims

1. A method of using a damping regulating damper in a coal mine, wherein the regulating damper includes a damper body (1), a window frame (3) is provided on the damper body (1), a shell (2) is provided at the outer end of the damper body (1), one end of the window frame (3) is hinged to the damper body (1) by a hinge (7), and the other end is connected to the shell (2) by a window lock (8), a number of damping nets (4) are provided between the window frame (3) and the shell (2), an inner frame (9) is provided on the outer side of the damping nets (4), and slide rails are provided at the upper and lower ends of the window frame (3), the slide rails include an outer slide rail (6) located on the outer side of the damper body (1) and an inner slide rail (5) located on the inner side of the damper body (1), the inner frame (9) is slidably connected to the slide rails, and a control component is provided at the bottom of the inner frame (9); Its features are: Includes the following steps: The first step is to calculate and determine the air volume in the parallel ventilation network and determine the position of the regulating damper: h1=R1Q1 2 h2=R2Q2 2 Where h1 represents the first branch resistance, pa; R1 represents the first branch wind resistance, N·s 2 / m 8 Q1 represents the air volume of the first branch, in meters. 3 h2 represents the drag of the second branch, Pa; R2 represents the wind resistance of the second branch, N·s 2 / m 8 Q2 represents the air volume of the second branch, in meters. 3 ; The position of the regulating damper is determined based on the magnitude of the local resistance in the parallel air network. The second step is to calculate the local drag loss of the airflow through the damping net: Where: ΔP represents the local resistance of the airflow passing through the damping mesh, Pa; μ represents the dynamic viscosity of the fluid, Pa / s; K1 represents the permeability of the fluid flowing through the damping mesh, m 3 / (sm 2 ); u represents the velocity of the fluid passing through the damping mesh, m / s; ρ represents the density of the fluid, kg / m³. 3 Y1 represents the inertia factor of the damping mesh; L represents the thickness of the damping mesh, in meters (m). Where ω represents the porosity of the damping mesh, %; The third step is to set up three layers of damping nets to regulate the air volume. Based on the local resistance obtained from the air volume distribution, determine how many layers of damping nets to arrange to regulate the air volume of the parallel air network.

2. The method of using a damping regulating air door in an underground coal mine according to claim 1, characterized in that: The damping mesh (4) comprises three layers of damping meshes with different porosities arranged in parallel, with a spacing of 6 cm between the damping meshes (4).

3. The method of using a damping regulating air door in an underground coal mine according to claim 1, characterized in that: The damping mesh (4) is spaced 3 cm from one end of the shell (2).

4. The method of using a damping regulating air door in an underground coal mine according to claim 1, characterized in that: The inner frame (9) has grooves at both the upper and lower ends, and anti-static strips (10) are provided in the grooves.

5. The method of using a damping regulating air door in an underground coal mine according to claim 1, characterized in that: The bottom of the inner frame (9) is provided with a scale strip (11).

6. The method of using a damping regulating air door in an underground coal mine according to claim 4, characterized in that: The control component includes a plug (12), a fixing rod (13), an outer frame strip (14), and a connecting block (16). One end of the plug (12) is close to the slide rail end and is connected to the slide rail via an anti-static strip (10). The other end is connected to the inner frame (9). The outer frame strip (14) is connected to the end of the plug (12) close to the housing (2). The fixing rod (13) is connected to the end of the outer frame strip (14) close to the housing (2). The fixing rod (13) passes through the outer frame strip (14) and is connected to the plug (12). The outer frame strip (14) fits snugly against the inner frame (9). A handle (15) is provided at the center line of the outer frame strip (14). The handle (15) passes through the outer frame strip (14) and connects to the inner frame (9). A connecting block (16) is provided at the end of the outer frame strip (14) away from the inner frame (9). A pivot (17) is provided at one end of the connecting block (16). A connecting rod (18) is connected at one end of the pivot (17). A pivot (19) is connected at one end of the connecting rod (18). A connecting rod (20) is connected at one end of the pivot (19). A slot (21) is provided at the free end of the connecting rod (20).

7. The method of using a damping regulating air door in an underground coal mine according to claim 6, characterized in that: The horizontal angle of the first rotating shaft (17) is tilted at 45°, and the second rotating shaft (19) can rotate 360°.

Images