A steeply inclined thin coal seam goaf sealing structure

Abstract

This utility model provides a sealing structure for goaf areas in steeply inclined thin coal seams, belonging to the field of coal mining technology. The sealing structure includes multiple sets of adjacent sealing templates and a sealing gate device for connecting adjacent sealing templates. An angle-adjustable support mechanism is provided at both the upper and lower ends of the sealing templates. A retractable sealing liquid bladder engaging mechanism is provided inside the groove above the sealing template. The sealing liquid bladder engaging mechanism includes a contact component and a sealing liquid bladder. The contact component includes a drive mechanism, a push plate, and multiple sets of telescopic sleeves. The drive mechanism includes a motor and a lead screw. The motor is fixedly mounted on the sealing template. The output end of the motor is fixedly connected to one end of the lead screw, and the other end of the lead screw is movably connected to the sealing template through a coupling seat. A slide rail is provided on the sealing template. This utility model can solve the problem of inadequate sealing due to the inability to adjust the sealing structure according to the actual mine wall shape, which affects the safety and efficiency of mining operations.

Description

Technical Field

[0001] This utility model belongs to the field of coal mining technology, and specifically relates to a sealing structure for goaf areas in steeply inclined thin coal seams. Background Technology

[0002] Steeply inclined thin coal seams, as an important component of coal resources, have always been a research focus in the field of coal mining due to their high mining difficulty and complex geological conditions. During the mining of steeply inclined thin coal seams, effective sealing of the goaf is a crucial step in ensuring safe production, preventing spontaneous combustion of coal, reducing gas leakage, and avoiding disasters such as roof collapse.

[0003] Currently, sealing of goaf areas in steeply inclined thin coal seams mainly employs baffles or flexible bags. Traditional baffle sealing methods have many drawbacks. Baffles are typically fixed structures, making them difficult to adapt to the complex and varied spatial morphology of steeply inclined coal seams. During installation, large gaps easily form between the baffle and the goaf wall, leading to serious grout and air leakage problems and failing to achieve an effective seal. Furthermore, fixed-angle baffles have poor stability in steeply inclined environments, making them unable to withstand pressure changes within the goaf and posing safety hazards.

[0004] The use of flexible bags for filling also has significant drawbacks. During the filling process, workers need to enter the goaf to place and adjust the bags. However, the roof and surrounding rock stability of steeply inclined, thin coal seams in the goaf are poor, posing serious threats to workers such as roof collapse and gas outbursts, resulting in extremely high safety risks. Furthermore, the flexible bags themselves have limited sealing performance, making it difficult to tightly conform to the irregular coal seam surface and completely fill the gap between the goaf and the coal seam. The sealing effect is unsatisfactory. Therefore, existing goaf sealing structures lack the ability to adaptively adjust to the inclination and undulations of the coal seam, resulting in an inability to adjust the sealing structure according to the actual mine wall shape. This leads to incomplete sealing, affecting the safety and efficiency of mining operations. Utility Model Content

[0005] In view of this, the present invention provides a sealing structure for goaf areas in steeply inclined thin coal seams, which can solve the problem that the sealing structure cannot be adjusted according to the actual shape of the mine wall, resulting in poor sealing and affecting the safety and efficiency of mining operations.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a sealing structure for a goaf in a steeply inclined thin coal seam, including multiple sets of adjacent sealing templates and a sealing gate device for connecting adjacent sealing templates. The upper and lower ends of the sealing templates are provided with angle adjustment support mechanisms, and the interior of the groove above the sealing template is provided with a retractable sealing liquid bladder engagement mechanism, which includes a contact component and a sealing liquid bladder.

[0008] The technical effects of the sealing structure for a steeply inclined thin coal seam goaf provided by this utility model are as follows: By setting an angle-adjustable support mechanism, the posture of the sealing template can be flexibly adjusted according to the inclination angle of the steeply inclined thin coal seam goaf, increasing the contact area between the sealing template and the top and bottom layers, making it more stable; by setting contact components to cooperate with the sealing liquid bladder to form a shape that adheres to the mine wall, the generation of irregular gaps is reduced; the fit between the sealing liquid bladder and the mine wall is greatly improved, and the sealing effect is significantly enhanced.

[0009] Based on the above technical solution, the sealing structure for the goaf of a steeply inclined thin coal seam of this utility model can be further improved as follows:

[0010] The contact components include a drive mechanism, a push plate, and multiple sets of telescopic sleeves. The drive mechanism includes a motor and a lead screw, with the motor fixedly mounted on the sealing template.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a drive mechanism to drive the push plate to move upward, the telescopic sleeve will lift the local position of the sealing liquid bladder, thereby achieving a sealed fit with the top layer of the mine wall.

[0012] Furthermore, the output end of the motor is fixedly connected to one end of the lead screw, and the other end of the lead screw is movably connected to the sealing template through a coupling seat.

[0013] Furthermore, a slide rail is provided on the sealing template, and the push plate is slidably connected to the sealing template through the slide rail. One end of the push plate is movably connected to the lead screw through the slide block.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by using a motor as a power source, the lead screw is driven to rotate, and the push plate moves in cooperation with the lead screw through the slide to achieve a displacement effect, thereby pushing the telescopic sleeve upward and forming support for the sealing liquid bladder at the bottom.

[0015] Furthermore, the telescopic sleeve includes an upper support rod, a lower sleeve rod, and a compression spring.

[0016] Furthermore, a cavity is provided inside the lower sleeve rod, the upper support rod is slidably connected to the lower sleeve rod, and a compression spring is set inside the cavity, with its top end contacting the bottom of the upper support rod and its bottom end contacting the bottom wall of the cavity.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a compression spring, the upper support rod can adaptively extend and retract according to the undulations of the top layer of the mine wall; when encountering a protruding part of the mine wall, the upper support rod compresses the compression spring and retracts into the lower sleeve rod; when encountering a concave part of the mine wall, the compression spring pushes the upper support rod to extend, and the extension and retraction of the upper support rod causes the sealing liquid bladder to deform, so that it fits the irregular shape of the top layer of the mine wall.

[0018] Furthermore, multiple sets of through holes are provided on the bottom wall of the groove, and sliders are provided on both sides of the through holes. Sliding grooves are provided on both sides of the outer wall of the lower sleeve corresponding to the slider positions, and the lower sleeve is slidably connected to the through holes.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting through holes and sliders, stable support and guidance are provided for the telescopic movement of the telescopic sleeve. The cooperation between the slider and the groove restricts the movement direction of the lower sleeve rod, so that it can only extend and retract along the axial direction of the through hole, preventing the lower sleeve rod from shaking or twisting during the extension and retraction process, ensuring the stability and accuracy of the movement of the contact parts, thereby ensuring that the sealing liquid bladder can produce shape changes, and further improving the reliability of the sealing device.

[0020] Furthermore, the angle adjustment support mechanism includes a support plate, a screw, and a locking nut.

[0021] Furthermore, the support plate is hinged to the sealing template at both ends by screws, and locking nuts are set on the screws.

[0022] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by rotating the locking nut, the angle between the support plate and the sealing template can be changed, so that the sealing template can better fit the mine wall of the goaf; compared with the traditional fixed angle support method, this structure solves the problem that the sealing device is difficult to adapt to different tilt angles.

[0023] Furthermore, a contact head is fixedly connected to the top of the upper support rod. The upper surface of the contact head is decorated with a wavy texture and covered with a layer of highly elastic silicone.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the wavy texture increases the friction between the contact head and the sealing liquid bladder, preventing the contact head from sliding when pushing the sealing liquid bladder and ensuring the accuracy of the shape adjustment of the sealing liquid bladder; the high elasticity silicone layer has good elasticity and deformation ability, which can better fit the surface of the sealing liquid bladder when pushing it, reducing the loss of force and avoiding damage to the sealing liquid bladder.

[0025] Compared with existing technologies, the beneficial effects of the sealing structure for steeply inclined thin coal seam goaf provided by this utility model are as follows: By setting an angle-adjustable support mechanism, the posture of the sealing template can be flexibly adjusted according to the inclination angle of the steeply inclined thin coal seam goaf, increasing the contact area between the sealing template and the top and bottom layers, making it more stable; by setting contact components to cooperate with the sealing liquid bladder to form a shape that adheres to the mine wall, the generation of irregular gaps is reduced; the fit between the sealing liquid bladder and the mine wall is greatly improved, and the sealing effect is significantly enhanced; by setting a drive mechanism to drive the push plate to move upward, driving the telescopic sleeve to lift the local position of the sealing liquid bladder, achieving a sealed fit with the top layer of the mine wall; by using a motor as a power source to drive the screw to rotate, the push plate moves in cooperation with the screw through the slide seat to achieve a displacement effect, thereby lifting the telescopic sleeve upward and forming support for the sealing liquid bladder at the bottom. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a sealing structure for a goaf area in a steeply inclined thin coal seam.

[0028] Figure 2 A schematic diagram of the sealing liquid bladder mechanism for a sealing structure in a goaf of a steeply inclined thin coal seam.

[0029] Figure 3 This is a schematic diagram of the angle adjustment support mechanism;

[0030] Figure 4 A schematic diagram showing the location of the angle adjustment support mechanism;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Sealing template; 101. Groove; 102. Slider; 11. Angle adjustment support mechanism; 111. Support plate; 112. Screw; 113. Locking nut; 12. Contact component; 121. Drive mechanism; 1211. Motor; 1212. Lead screw; 122. Push plate; 1221. Slide block; 123. Telescopic sleeve; 1231. Upper support rod; 1232. Lower sleeve rod; 1233. Compression spring; 13. Sealing liquid bladder; 14. Contact head. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-4 The image shows an embodiment of a sealing structure for a goaf in a steeply inclined thin coal seam provided by this utility model. In this embodiment, it includes multiple sets of adjacent sealing templates 10 and a sealing gate device for connecting adjacent sealing templates 10. An angle adjustment support mechanism 11 is provided at the upper and lower ends of the sealing template 10. A retractable sealing liquid bladder engaging mechanism is provided inside the groove 101 above the sealing template 10. The sealing liquid bladder engaging mechanism includes a contact component 12 and a sealing liquid bladder 13.

[0035] In the above technical solution, the contact component 12 includes a drive mechanism 121, a push plate 122 and multiple sets of telescopic sleeves 123. The drive mechanism 121 includes a motor 1211 and a lead screw 1212. The motor 1211 is fixedly mounted on the sealing template 10.

[0036] Furthermore, in the above technical solution, the output end of the motor 1211 is fixedly connected to one end of the lead screw 1212, and the other end of the lead screw 1212 is movably connected to the sealing template 10 through a coupling seat.

[0037] Furthermore, in the above technical solution, a slide rail is provided on the sealing template 10, and the push plate 122 is slidably connected to the sealing template 10 through the slide rail. One end of the push plate 122 is movably connected to the lead screw 1212 through the slide block 1221.

[0038] Furthermore, in the above technical solution, the telescopic sleeve 123 includes an upper support rod 1231, a lower sleeve rod 1232, and a compression spring 1233.

[0039] Furthermore, in the above technical solution, a cavity is provided inside the lower sleeve rod 1232, the upper support rod 1231 is slidably connected to the lower sleeve rod 1232, and the compression spring 1233 is set inside the cavity, with its top end contacting the bottom of the upper support rod 1231 and its bottom end contacting the bottom wall of the cavity.

[0040] Furthermore, in the above technical solution, the bottom wall of the groove 101 is provided with multiple sets of through holes, and sliders 102 are provided on both sides of the through holes. Sliding grooves are provided on both sides of the outer wall of the lower sleeve rod 1232 corresponding to the positions of the sliders 102, and the lower sleeve rod 1232 is slidably connected to the through holes.

[0041] Furthermore, in the above technical solution, the angle adjustment support mechanism 11 includes a support plate 111, a screw 112, and a locking nut 113.

[0042] Furthermore, in the above technical solution, the support plate 111 is movably hinged to the sealing template 10 by the screws 112 at both ends, and the locking nut 113 is set on the screw 112.

[0043] Furthermore, in the above technical solution, a contact head 14 is fixedly connected to the top of the upper support rod 1231. The upper surface of the contact head 14 is provided with a wavy texture and covered with a layer of highly elastic silicone.

[0044] The following are specific applications in different application scenarios:

[0045] Example 1:

[0046] The application scenario is for sealing operations in thin coal seams with steep inclination angles of 45°-55°, goaf cross-sectional width of 2-3 meters, and local undulation height difference of coal seam surface not exceeding 30 centimeters.

[0047] The sealing template is a single piece with dimensions of 2 meters long, 1.5 meters wide, and 0.1 meters thick. It is made of high-strength steel plate with a yield strength of not less than 345 MPa to ensure the strength and stability of the template and to withstand the internal pressure of the goaf.

[0048] The depth and height of the groove and protrusion of the sealing gate device are both 5 cm, the width of the magnetic strip is 3 cm, the width of the metal strip is corresponding, and the cross-section of the sealing strip is rectangular with a size of 2 cm × 2 cm, ensuring that the adjacent templates are tightly connected and have good sealing performance.

[0049] The support plate of the angle adjustment support mechanism is 0.8 meters long, 0.5 meters wide, and 0.08 meters thick, and is made of Q235 steel.

[0050] The screw is a high-strength screw of M20 specification, and the length is determined according to the actual installation requirements, generally between 0.3 and 0.5 meters, to ensure sufficient adjustment range.

[0051] The locking nut is matched with the screw rod and is made of 45 steel with rust prevention treatment on the surface.

[0052] The adjusting hydraulic cylinder of the sealing gate device has a stroke of 20 cm and a maximum thrust of 50 kN, which can ensure a firm sealing connection between the sealing templates.

[0053] The retractable sealing liquid bladder mechanism uses a 1.5kW servo motor for the drive mechanism, with a lead screw of 10mm and a diameter of 20mm, which enables precise linear motion control and meets the retraction and adjustment requirements of the contact parts.

[0054] The push plate measures 0.6 meters long, 0.4 meters wide, and 0.05 meters thick. The width of the slide track matches the width of the push plate, with the gap controlled between 0.5 and 1 mm to ensure smooth and stable sliding of the push plate.

[0055] The lower sleeve of the telescopic sleeve is 0.4 meters long, 3 centimeters in outer diameter, and 0.2 centimeters in wall thickness; the upper support rod is 0.3 meters long, 2 centimeters in outer diameter, and 0.15 centimeters in wall thickness; the spring has an elastic coefficient of 50 N / cm and a free length of 0.2 meters, ensuring that the upper support rod can extend and retract flexibly and provide sufficient support force.

[0056] The contact head has a diameter of 5 cm, the height difference between the crests and troughs of the wavy texture on the surface is 0.5 cm, and the thickness of the highly elastic silicone layer is 0.3 cm, which enhances the friction and sealing performance with the sealing liquid bladder.

[0057] The sealing liquid bladder is made of high-strength rubber with a thickness of 0.5 cm. When unfolded, its size matches the groove above the sealing template. It is 2 meters long and 1.2 meters wide, which can fully fill the sealing gap.

[0058] Implementation process:

[0059] First, the sealing template is installed in the goaf using an angle-adjusting support mechanism. Based on an inclination angle of 45°-55°, the angle of the sealing template is adjusted using a screw and adjusting hydraulic cylinder to ensure it fits snugly against the goaf wall. Then, the sealing gate device of adjacent sealing templates is connected to ensure a tight seal. The drive mechanism is then activated; the motor drives the lead screw to rotate, pushing the push plate to extend the telescopic sleeve. Under the action of the compression spring, the upper support rod drives the contact head to conform to the undulating surface of the coal seam, deforming the sealing liquid bladder and tightly adhering it to the mine wall. Finally, liquid is injected into the sealing liquid bladder through the filling pipe to complete the sealing operation.

[0060] Example 2:

[0061] The application scenario is a steeply inclined thin coal seam goaf with an angle of 60°-70°, a goaf section width of 3-4 meters, and a local undulation height difference of no more than 50 centimeters on the coal seam surface.

[0062] Sealing template: Each sealing template is 2.5 meters long, 1.8 meters wide, and 0.12 meters thick. It is made of high-strength alloy steel with a yield strength of over 420 MPa to adapt to the pressure of goaf areas with larger angles and spaces.

[0063] Sealing gate device: The depth and height of the groove and protrusion are adjusted to 6 cm, the width of the magnetic strip is 4 cm, the width of the metal strip is corresponding, and the cross-sectional size of the sealing strip is 2.5 cm × 2.5 cm, further enhancing the sealing effect.

[0064] The support plate of the angle adjustment support mechanism is 1 meter long, 0.6 meters wide, and 0.1 meters thick, and is made of high-performance alloy steel.

[0065] Screw: An M24 screw with a length of 0.4-0.6 meters is selected to meet the angle adjustment requirements.

[0066] Locking nut: Matching nut, made of alloy steel and heat-treated for reinforcement.

[0067] Adjustable hydraulic cylinder: stroke 30 cm, maximum thrust 80 kN.

[0068] Drive mechanism: The motor power is increased to a 2.2kW servo motor with a lead screw of 12mm and a diameter of 25mm, achieving more powerful and precise drive.

[0069] Push plate: Dimensions are 0.8 meters long, 0.5 meters wide, and 0.06 meters thick. The gap between the slide and the push plate is controlled at 0.8-1.2 mm.

[0070] Telescopic sleeve: lower sleeve rod length 0.5 m, outer diameter 4 cm, wall thickness 0.25 cm; upper support rod length 0.4 m, outer diameter 3 cm, wall thickness 0.2 cm; compression spring elastic coefficient 80 N / cm, free length 0.25 m.

[0071] Contact head: 6 cm in diameter, wavy texture with a peak-to-trough height difference of 0.8 cm, and a high-elasticity silicone layer with a thickness of 0.4 cm.

[0072] Sealed liquid bladder: Made of high-pressure resistant rubber material, 0.6 cm thick, with dimensions of 2.5 meters long and 1.5 meters wide.

Claims

1. A sealing structure for a goaf in a steeply inclined thin coal seam, comprising multiple sets of adjacent sealing templates (10) and a sealing gate device for connecting adjacent sealing templates (10), characterized in that, An angle adjustment support mechanism (11) is provided at both the upper and lower ends of the sealing template (10). A retractable sealing liquid bladder fitting mechanism is provided inside the groove (101) above the sealing template (10). The sealing liquid bladder fitting mechanism includes a contact component (12) and a sealing liquid bladder (13).

2. The sealing structure for a goaf in a steeply inclined thin coal seam according to claim 1, characterized in that, The contact component (12) includes a drive mechanism (121), a push plate (122), and multiple sets of telescopic sleeves (123). The drive mechanism (121) includes a motor (1211) and a lead screw (1212). The motor (1211) is fixedly mounted on the sealing template (10).

3. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 2, characterized in that, The output end of the motor (1211) is fixedly connected to one end of the lead screw (1212), and the other end of the lead screw (1212) is movably connected to the sealing template (10) through the coupling seat.

4. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 3, characterized in that, A slide rail is provided on the sealing template (10), and the push plate (122) is slidably connected to the sealing template (10) through the slide rail. One end of the push plate (122) is movably connected to the lead screw (1212) through the slide block (1221).

5. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 4, characterized in that, The telescopic sleeve (123) includes an upper support rod (1231), a lower sleeve rod (1232), and a compression spring (1233).

6. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 5, characterized in that, The lower sleeve rod (1232) has a cavity inside. The upper support rod (1231) is slidably connected to the lower sleeve rod (1232). The compression spring (1233) is set inside the cavity, with its top end contacting the bottom of the upper support rod (1231) and its bottom end contacting the bottom wall of the cavity.

7. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 6, characterized in that, The bottom wall of the groove (101) has multiple sets of through holes, and sliders (102) are provided on both sides of the through holes. The outer walls of the lower sleeve (1232) are provided with grooves corresponding to the sliders (102), and the lower sleeve (1232) is slidably connected to the through holes.

8. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 7, characterized in that, The angle adjustment support mechanism (11) includes a support plate (111), a screw (112), and a locking nut (113).

9. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 8, characterized in that, The support plate (111) is hinged to the sealing template (10) by screws (112) at both ends, and the locking nut (113) is set on the screw (112).

10. A sealing structure for a goaf in a steeply inclined thin coal seam according to claim 9, characterized in that, The top of the upper support rod (1231) is fixedly connected to a contact head (14), the upper surface of the contact head (14) is provided with a wavy texture and covered with a layer of highly elastic silicone.

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