A mine overburden strata separation grouting spouting prevention and control device

Abstract

The present application relates to the technical field of off-layer grouting, and discloses a mine overburden off-layer grouting and spouting prevention and control equipment, which comprises a sealing mechanism one arranged at the middle part of a sleeve pipe and a sealing mechanism two arranged at the joint of two sleeve pipes. The sealing mechanism one comprises a cylindrical sleeve pipe capable of rotating relative to the outside of the sleeve pipe, the middle part of the sleeve pipe is provided with an annular groove, an elastic skin one is arranged at the groove opening of the annular groove, the annular groove is sealed to form an air cavity by the elastic skin one, and the sleeve pipe is provided with an air channel in communication with the air cavity, one end of the air channel being an air inlet; a power mechanism is further arranged on the sleeve pipe, and the power mechanism drives the sleeve pipe to rotate along the sleeve pipe. The sealing mechanism two blocks the grouting hole at the joint of the two sleeve pipes. The sealing mechanism designed in the present application can effectively seal the grouting hole, avoid waste of slurry, improve the effect of off-layer grouting, and improve the safety of the mining area.

Description

Technical Field

[0001] This invention relates to the field of delamination grouting technology, and in particular to a grout leakage prevention device for delamination grouting in mine overburden. Background Technology

[0002] In the field of coal mining, in order to reduce the impact of mining on the surface, grouting treatment, such as fly ash and sand, is usually carried out by drilling into the delamination fractures between the overlying rock strata of the coal seam. This reduces the movement of the overlying rock and thus achieves the purpose of controlling surface subsidence.

[0003] Separation grouting involves drilling a hole on the surface and filling it with grout. The space from the surface to the separation layer mainly consists of Quaternary loose layer, bedrock (rock strata), and separation space. Similar to oil drilling, the general operation is as follows: first, a grouting hole is drilled, then cementing is carried out, and finally, casing is run in.

[0004] Currently, when grouting for delamination, if the borehole cementing is not done properly, the grout is prone to leaking out from the gap between the casing and the soil when it flows out of the grouting hole because the diameter of the casing is smaller than the diameter of the borehole. This can lead to grout leakage, forcing the grouting to be stopped, which seriously affects the delamination reinforcement effect and causes a large amount of grout to be wasted, thus creating significant problems for delamination grouting. Summary of the Invention

[0005] To address the technical problems mentioned in the background section, this invention provides a grout leakage prevention device for mine overburden separation grouting.

[0006] The present invention is achieved by the following technical solution: a grout leakage prevention device for overburden separation grouting in mines, comprising a sealing mechanism 1 located in the middle of the casing and a sealing mechanism 2 installed at the connection of two casings.

[0007] The sealing mechanism includes a cylindrical sleeve that can rotate relative to the outside of the sleeve. An annular groove is provided in the middle of the sleeve, and an elastic skin is provided at the opening of the annular groove. The elastic skin seals the annular groove to form an air cavity. An air passage communicating with the air cavity is provided inside the sleeve, and one end of the air passage is an air inlet. A power mechanism is also provided on the sleeve, which drives the sleeve to rotate along the sleeve.

[0008] The sealing mechanism also includes a hole-expanding mechanism located on the outside of the sleeve to form an enlarged portion with a larger cross-sectional diameter inside the grouting hole, and the hole-expanding mechanism, together with the elastic skin, can block the grouting hole.

[0009] The second sealing mechanism blocks the grouting hole at the connection between the two sleeves.

[0010] As a further improvement to the above scheme, several reaming mechanisms are distributed along the circumference of the sleeve. The reaming mechanism includes an arc-shaped movable plate. The two ends of the movable plates in adjacent reaming mechanisms can fit tightly together. The curvature of the movable plate is the same as that of the sleeve and the grouting hole. In the vertical direction, the top of the movable plate is higher than the top surface of the sleeve, and its bottom is lower than the bottom surface of the sleeve. A connecting part is provided at the middle of both ends of the movable plate. A mounting hole is opened on the connecting part, and a rotating shaft is installed at the mounting hole. A mounting block that is rotatably connected to the rotating shaft is fixed on the outside of the sleeve. A drive mechanism is also provided on the sleeve to drive each movable plate to rotate along the rotating shaft. The drive mechanism drives each movable plate to rotate synchronously, and the sleeve rotates relative to the sleeve to form an enlarged part on the inner wall of the grouting hole.

[0011] As a further improvement to the above solution, the connecting part and the movable plate can slide relative to each other along the radial direction of the sleeve. The movable plate has an insertion groove on its inner side, and a connecting rod that slides into the insertion groove is fixed on the connecting part. A guide groove is provided in the insertion groove along its depth direction. A guide part that slides with the guide groove is provided on the outer side of the connecting rod so that the connecting rod can only slide along the depth direction of the insertion groove. A return spring is installed in the guide groove.

[0012] As a further improvement to the above solution, several abutment mechanisms are distributed on the inner side of the movable plate to contact the expanded elastic skin, thereby pushing the movable plate to fit against the inner wall of the enlarged part. The abutment mechanism includes a push rod and a pressure plate, wherein the push rod is connected to the inner side of the movable plate, and the pressure plate is fixed to the other end of the push rod. The pressure plate is an arc-shaped plate to facilitate contact with the surface of the elastic skin.

[0013] As a further improvement to the above solution, a central hole is provided in the middle of the sleeve for the sleeve tube to pass through, an annular groove is provided on the outer wall of the sleeve along the circumference, and a positioning pin is provided on the inner wall of the sleeve. The positioning pin can be movably locked in the annular groove so that the sleeve and the sleeve tube are relatively fixed in the axial direction. A servo motor is provided on the inner side of the sleeve, and the output shaft of the servo motor is connected to a spur gear. A gear ring that meshes with the spur gear is provided on the outer wall of the sleeve to drive the sleeve to rotate around the sleeve tube.

[0014] As a further improvement to the above solution, elastic telescopic units are provided at both ends of the movable plate to achieve circumferential sealing when the movable plate is in contact with the inner wall of the enlarged part.

[0015] As a further improvement to the above solution, the elastic telescopic unit includes a mounting groove at the end of the movable plate, several internal elastic elements disposed in the mounting groove, and a telescopic sealing plate connected to the internal elastic elements. The telescopic sealing plate has an inner end inserted into the mounting groove and connected to the internal elastic elements, and an outer end located outside the mounting groove. The thickness and height of the outer end are consistent with the main body of the movable plate. Both ends of the outer end extend towards the middle of the movable plate with tails. The top and bottom surfaces of the end of the movable plate are respectively provided with tail grooves that can cooperate with the tails. The width of the tails is consistent with the thickness of the movable plate.

[0016] As a further improvement to the above solution, the internal elastic element is a columnar spring.

[0017] As a further improvement to the above solution, the sealing mechanism two includes an elastic skin two and an annular coupling interface opened on the end face of the sleeve. Both ends of the elastic skin two have flanges, which are detachably fixed to the sleeve by a fixing mechanism. The elastic skin two and the outer surface of the sleeve form an annular cavity. The annular cavity and the annular coupling interface are connected through a through hole on the sleeve. The other end of the coupling pipe has a coupling connector that can be inserted into one end of the insertion pipe of the annular coupling interface. This end is also provided with an annular boss that can be spirally connected to the annular coupling interface. The top of the annular boss is rotatably connected to an annular extrusion part, so that the extrusion part gradually extends into the annular coupling interface to pressurize the inside of the annular cavity.

[0018] As a further improvement to the above solution, the fixing mechanism includes an annular groove formed on the outer surface of the sleeve, a clamping sleeve movably installed in the annular groove, the clamping sleeve being able to clamp the flange, and a locking clamp can be provided on the outside of the clamping sleeve for fixing.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The present invention proposes a grout leakage prevention device for overburden separation grouting in mines, comprising a sealing mechanism 1 located in the middle of the casing and a sealing mechanism 2 installed at the connection of two casings.

[0021] The sealing mechanism proposed in this invention includes a cylindrical sleeve that can rotate relative to the outside of the casing. An annular groove is provided in the middle of the sleeve, and an elastic skin is provided at the opening of the annular groove. The elastic skin seals the annular groove to form an air cavity, and an air passage communicating with the air cavity is provided inside the sleeve, with one end of the air passage serving as an air inlet. A power mechanism is also provided on the sleeve, driving the sleeve to rotate along the casing. The sealing mechanism also includes a hole-expanding mechanism located on the outside of the sleeve to form an enlarged portion with a larger cross-sectional diameter inside the grouting hole. The hole-expanding mechanism, in conjunction with the elastic skin, can block the grouting hole.

[0022] The sealing mechanism two proposed in this invention blocks the grouting hole at the connection between the two sleeves.

[0023] The above structure can effectively seal the grouting holes, avoid waste of grout, improve the effect of delamination grouting, and enhance the safety of the mining area. Attached Figure Description

[0024] Figure 1 This is a perspective view of the sleeve and sealing mechanism proposed in this invention;

[0025] Figure 2 This is a schematic diagram of the structure of the sealing mechanism proposed in this invention when the movable plate rotates to form a complete circular ring.

[0026] Figure 3 This is a schematic diagram of the structure of the sealing mechanism proposed in this invention after the movable plate has been rotated by a certain angle.

[0027] Figure 4 For the present invention Figure 2 Enlarged view of point A;

[0028] Figure 5 For the present invention Figure 2 Enlarged view of point B;

[0029] Figure 6 This is a schematic diagram of the sleeve and sealing mechanism 2 in Embodiment 2 of the present invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged view of point C.

[0031] Figure 8 This is a schematic diagram of the structure of the movable plate proposed in this invention;

[0032] Figure 9 This is a partial three-dimensional view of the corner structure of the movable plate proposed in this invention.

[0033] Explanation of key symbols:

[0034] In the diagram: 1. Sleeve; 2. Sleeve; 3. Movable plate; 301. Connecting part; 302. Insertion groove; 303. Tail groove; 4. Transmission gear; 5. Mounting block; 6. Rotating shaft; 7. Groove; 8. Drive gear; 9. Drive motor; 10. Annular sleeve; 11. Elastic skin I; 12. Enlargement part; 13. Mounting gear; 14. Top rod; 1401. Pressure plate; 15. Grouting hole; 16. Guide part; 17. Return spring; 19. Connecting rod; 20. Internal elastic element; 21. Mounting groove; 22. Telescopic sealing plate; 221. Inner end; 222. Outer end; 223. Tail; 23. Connecting joint; 24. Annular groove; 25. Pressing sleeve; 26. Locking clamp; 27. Elastic skin II; 28. Through hole; 29. ​​Annular boss; 30. Extrusion part; 31. Flanged edge. Detailed Implementation

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] Example 1:

[0037] Reference Figure 1-5 8-9, This scheme proposes a grout leakage prevention device for mine overburden separation grouting, including a sealing mechanism 1 located in the middle of the casing 1 and a sealing mechanism 2 installed at the connection of the two casings 1.

[0038] The sealing mechanism includes a cylindrical sleeve 2 that can rotate relative to the outside of the sleeve 1. An annular groove is provided in the middle of the sleeve 2. The annular groove is not marked with a number in the drawings, but it does not affect the understanding of this solution by those skilled in the art. An elastic skin 11 is provided at the opening of the annular groove. The elastic skin 11 seals the annular groove to form an air cavity. The sleeve 2 is provided with an air passage that communicates with the air cavity. One end of the air passage is an air inlet. A power mechanism is also provided on the sleeve 2. The power mechanism drives the sleeve 2 to rotate along the sleeve 1.

[0039] The sealing mechanism also includes a hole-expanding mechanism disposed on the outside of the sleeve 2 to form an enlarged portion 12 with a larger cross-sectional diameter inside the grouting hole 15, and the hole-expanding mechanism, together with the elastic skin 11, can block the grouting hole.

[0040] Because the inner wall of the grouting hole is not smooth after it is formed, it is easy to cause leakage if the hole is directly sealed with a hole sealer, and the effect of preventing grout leakage is not good. Therefore, the hole expansion mechanism can form an enlarged part with a smooth inner wall inside the grouting hole. At this time, sealing at the enlarged part can play a better role in preventing grout leakage and the sealing performance is better.

[0041] In this scheme, the sealing mechanism 2 blocks the grouting hole 15 at the connection of the two sleeves 1.

[0042] As an optional embodiment of the present invention, several reaming mechanisms are distributed along the circumference of the sleeve 2. The reaming mechanism includes an arc-shaped movable plate 3. The two ends of the movable plates 3 in adjacent reaming mechanisms can fit tightly together. The curvature of the movable plate 3 is the same as that of the sleeve 2 and the grouting hole 15. In the vertical direction, the top end of the movable plate 3 is higher than the top surface of the sleeve 2, and its bottom end is lower than the bottom surface of the sleeve 2. A connecting part 301 is provided at the middle of both ends of the movable plate 3. An installation hole is provided on the connecting part 301. A rotating shaft 6 is installed at the installation hole. An installation block 5 that is rotatably connected to the rotating shaft 6 is fixed on the outside of the sleeve 2. A driving mechanism is also provided on the sleeve 2 to drive each movable plate 3 to rotate along the rotating shaft 6. The driving mechanism drives each movable plate 3 to rotate synchronously. The sleeve 2 rotates relative to the sleeve 1 to form an enlarged part 12 on the inner wall of the grouting hole 15.

[0043] The drive mechanism includes an annular sleeve 10 rotatably connected to the top surface of the sleeve 2. A toothed ring is provided on the outer wall of the annular sleeve 10. A drive motor 9 is fixed on the outer side of the sleeve 2. A drive gear 8 is connected to the output end of the drive motor 9. The drive gear 8 meshes with the toothed ring.

[0044] Specific reference Figure 2 When the movable plate 3 is rotated to the state shown, a gap remains between the outer surface of the movable plate and the inner wall of the grouting hole. In specific operation, the drive motor 9 drives the drive gear 8 to rotate, causing the annular sleeve to rotate, which in turn drives the movable plate 3 to rotate. Since the end of the movable plate 3 will abut against the inner wall of the grouting hole, the movable sleeve rotates counterclockwise. A cutter is installed at the end of the movable plate 3, and its end is hardened. This causes the diameter of the enlarged portion to increase until the drive motor stops working, at which point a shape resembling... Figure 3 The structure in.

[0045] In this design, the connecting part 301 and the movable plate 3 can slide relative to each other radially along the sleeve 2. The movable plate 3 has an insertion groove 302 on its inner side. A connecting rod 19, which slides into the insertion groove 302, is fixed on the connecting part 301. A guide groove is formed within the insertion groove 302 along its depth direction. A guide part 16, which slides with the guide groove, is provided on the outer side of the connecting rod 19, ensuring that the connecting rod 19 can only slide along the depth direction of the insertion groove 302. A return spring 17 is installed in the guide groove. This structure facilitates the sliding of the movable plate 3 radially along the sleeve 2, allowing the outer surface of the movable plate 3 to adhere to the inner wall of its enlarged portion.

[0046] The inner side of the movable plate 3 has several abutting mechanisms to contact the expanded elastic skin 11, thereby pushing the movable plate 3 to fit against the inner wall of the enlarged part 12. The abutting mechanism includes a push rod 14 and a pressure plate 1401. The push rod 14 is connected to the inner side of the movable plate 3, and the pressure plate 1401 is fixed to the other end of the push rod 14. The pressure plate 1401 is an arc-shaped plate to facilitate contact with the surface of the elastic skin.

[0047] A central hole is provided in the middle of the sleeve 2 for the sleeve 1 to pass through (see reference). Figure 1 The outer wall of the sleeve 1 is provided with an annular groove along the circumference. The central hole and the annular groove are not shown by reference numerals in the attached drawings, but this does not affect the understanding of this solution by those skilled in the art. The inner wall of the sleeve 2 is provided with a positioning pin, which can be movably locked in the annular groove so that the sleeve 2 and the sleeve 1 are relatively fixed in the axial direction. A servo motor is provided on the inner side of the sleeve 2. The output shaft of the servo motor is connected to a spur gear. The outer wall of the sleeve 1 is provided with a gear ring that meshes with the spur gear to drive the sleeve 2 to rotate around the sleeve 1.

[0048] Specific reference Figure 5Both ends of the movable plate 3 are provided with elastic telescopic units so that circumferential sealing can be achieved when the movable plate 3 is in contact with the inner wall of the enlarged part 12.

[0049] The elastic telescopic unit includes a mounting groove 21 at the end of the movable plate 3, a plurality of internal elastic elements 20 disposed in the mounting groove 21, and a telescopic sealing plate 22 connected to the internal elastic elements 20. The telescopic sealing plate 22 has an inner end 221 inserted into the mounting groove 21 and connected to the internal elastic elements 20, and an outer end 222 located outside the mounting groove 21. The thickness and height of the outer end 222 are the same as those of the main body of the movable plate 3. Both ends of the outer end 222 extend towards the middle of the movable plate 3 with tails 223. The top and bottom surfaces of the end of the movable plate 3 are respectively provided with tail grooves 303 that can cooperate with the tails 223. The width of the tails 223 is the same as the thickness of the movable plate 3.

[0050] In this design, the internal elastic element 20 is a columnar spring.

[0051] Example 2:

[0052] Reference Figure 6 , Figure 7 As an optional embodiment of the present invention, the sealing mechanism 2 includes an elastic skin 27 and an annular coupling interface formed on the end face of the sleeve 1. Both ends of the elastic skin 27 have flanges 31, which are detachably fixed to the sleeve 1 by a fixing mechanism. The elastic skin 27 and the outer surface of the sleeve form an annular cavity. The annular cavity and the annular coupling interface are connected by a through hole 28 on the sleeve 1. The other end of the coupling pipe 1 has a coupling connector 23 that can be inserted into one end of the insertion pipe 1 that forms the annular coupling interface. This end is also provided with an annular boss 29 that can be spirally connected to the annular coupling interface. The top of the annular boss 29 is rotatably connected to an annular pressing part 30, so that the pressing part 30 gradually extends into the annular coupling interface to pressurize the inside of the annular cavity.

[0053] The fixing mechanism includes an annular groove 24 formed on the outer surface of the sleeve 1, and a clamping sleeve 25 movably installed in the annular groove 24. The clamping sleeve 25 can clamp the flange 31, and a locking clamp 26 can be provided on the outside of the clamping sleeve 25 for fixing.

[0054] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A mine overburden separation grouting spouting prevention and control equipment, characterized in that, The sealing mechanism one includes a cylindrical sleeve capable of rotating relative to the outside of the grouting pipe, a middle part of the sleeve is provided with an annular groove, an elastic skin one is arranged at the slot opening of the annular groove, the elastic skin one seals the annular groove to form an air cavity, and a gas channel is arranged in the sleeve and communicates with the air cavity, one end of the gas channel is an air inlet; a power mechanism is further arranged on the sleeve, and the power mechanism drives the sleeve to rotate along the grouting pipe; The sealing mechanism one further includes a reaming mechanism arranged outside the sleeve to form an enlarged part with a larger cross-sectional diameter in the grouting hole, and the reaming mechanism cooperates with the elastic skin one to block the grouting hole; The sealing mechanism two blocks the grouting hole at the connection of the two grouting pipes; The reaming mechanism is distributed along the circumference of the sleeve, and the reaming mechanism includes an arc-shaped movable plate, the two ends of the movable plate in adjacent reaming mechanisms can be tightly attached, the curvature of the movable plate is the same as that of the sleeve and the grouting hole, in the vertical direction, the top end of the movable plate is higher than the top surface of the sleeve, and the bottom end of the movable plate is lower than the bottom surface of the sleeve, the middle part of the two ends of the movable plate is provided with a connecting part, the connecting part is provided with a mounting hole, a rotating shaft is mounted on the mounting hole, the outside of the sleeve is fixedly provided with a mounting block in rotating connection with the rotating shaft, and a driving mechanism for driving each movable plate to rotate along the rotating shaft is further arranged on the sleeve. The connecting part and the movable plate can slide relative to each other along the radial direction of the sleeve, the inside of the movable plate is provided with a plug-in groove, the connecting part is fixedly provided with a connecting plug rod which is plugged into the plug-in groove, a guide groove is formed in the plug-in groove along the depth direction of the plug-in groove, a guide part is arranged on the outside of the connecting plug rod and is in sliding connection with the guide groove, so that the connecting plug rod can only slide along the depth direction of the plug-in groove, and a return spring is mounted in the guide groove. The inside of the movable plate is provided with a plurality of abutting mechanisms to contact the expanded elastic skin one, so as to push the movable plate to tightly attach to the inner wall of the enlarged part, the abutting mechanism includes a jacking rod and a pressing plate, the jacking rod is connected to the inside of the movable plate, and the pressing plate is fixed to the other end of the jacking rod, the pressing plate is an arc-shaped plate to facilitate the contact with the surface of the elastic skin one.

2. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 1, characterized in that, A center hole is formed in the middle part of the sleeve for the grouting pipe to pass through, an annular clamping groove is formed in the outer wall of the grouting pipe along the circumference, a positioning pin is arranged on the inner wall of the sleeve, the positioning pin can be movably clamped in the annular clamping groove, so that the sleeve and the grouting pipe are fixed relative to each other in the axial direction, and a servo motor is arranged on the inside of the sleeve, a spur gear is connected to the output shaft of the servo motor, and a gear ring is arranged on the outer wall of the grouting pipe and is in meshing connection with the spur gear, so as to drive the sleeve to rotate around the grouting pipe.

3. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 2, characterized in that, The two ends of the movable plate are provided with elastic extension units to achieve circumferential sealing when the movable plate is attached to the inner wall of the enlarged part.

4. The roof fall prevention and control equipment for grouting of the separation layer of the overburden strata of a mine according to claim 3, characterized in that, ​ 5. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 4, characterized in that, The elastic expansion unit comprises a mounting groove formed in the end of the movable plate, a plurality of internal elastic members arranged in the mounting groove, and an expansion sealing plate connected with the internal elastic members, the expansion sealing plate having an inner end inserted into the mounting groove and connected with the internal elastic members, and an outer end located outside the mounting groove, the thickness and height of the outer end being consistent with the main body of the movable plate, and the two ends of the outer end extending towards the middle part of the movable plate and having tail portions, the top surface and the bottom surface of the end of the movable plate being respectively provided with tail grooves capable of cooperating with the tail portions, and the width of the tail portions being consistent with the thickness of the movable plate.

6. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 5, characterized in that, The internal elastic member is a columnar spring.

7. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 1, characterized in that, The grouting pipe comprises a plug-in pipe and a butt joint pipe, the sealing mechanism two comprises a second elastic skin, and an annular butt joint port formed in one end of the plug-in pipe, the two ends of the second elastic skin are provided with flanges, the flanges are detachably fixed to the plug-in pipe through a fixing mechanism, the outer surface of the second elastic skin and the plug-in pipe forms an annular cavity, the annular cavity and the annular butt joint port are communicated through a through hole formed in the plug-in pipe, one end of the butt joint pipe is provided with a butt joint head capable of being inserted into the annular butt joint port, and the one end of the butt joint pipe is also provided with an annular convex platform capable of being screwed with the annular butt joint port, the top of the annular convex platform is rotatably connected with an annular extrusion portion, and the extrusion portion gradually extends into the annular butt joint port to pressurize the inside of the annular cavity.

8. The equipment for preventing and treating outburst of grout in mine overburden separation layer grouting according to claim 7, characterized in that, The fixing mechanism comprises an annular clamping groove formed in the outer surface of the grouting pipe, and a compression sleeve movably arranged in the annular clamping groove, the compression sleeve is capable of compressing the flanges, and a locking clamp can be arranged outside the compression sleeve for fixation.

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