Drill bit for pulling out explosives when explosives fail in blasting drilling of anti-impact roof of coal mine and construction method

Abstract

The drill bit comprises a drill sleeve, a water guide hole is formed in the center of the drill sleeve, containing grooves which are evenly distributed in the circumferential direction are formed in the side wall of the bottom end of the drill sleeve, a protection plate is installed on the outer side of the portion, between the adjacent containing grooves, of the side wall of the drill sleeve, and a stable plate frame is installed in the center of the bottom end of the drill sleeve. A wall grinding mechanism is further installed on the containing groove and comprises a first telescopic mechanism, the first telescopic mechanism is installed on the containing groove in the radial direction, an axial second telescopic mechanism is installed at the outer end of the first telescopic mechanism, and a grinding plate is installed at the lower end of the second telescopic mechanism. The grinding plate comprises a first grinding plate arranged in the axial direction and a second grinding plate arranged in the radial direction and installed at the lower end of the first grinding plate.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine blasting holes, and in particular to a drill bit and a construction method for removing ineffective explosives in roof blasting holes for coal mine impact prevention Background Technique

[0002] During the coal mining process, in coal seams with the risk of rock burst, by accurately arranging blast holes, reasonably charging explosives and detonating, the purpose of breaking the roof and releasing ground pressure is achieved. However, in actual operation, such as insufficient drilling depth, irregular hole walls, loose charging, damp explosives or unqualified quality, when the explosives fail to detonate normally, the explosives often become ineffective.

[0003] At present, during the process of removing ineffective explosives, manual operation is often required, which not only takes a long time, but also has a large labor intensity, affects the overall mining progress, and has low operation efficiency. In addition, the explosives are prone to continuous friction with the hole wall, there is a risk of the explosives being detonated, dangerous situations such as hole wall collapse and explosive residue, and there is a great danger to personnel.

[0004] Therefore, it is necessary to provide a drill bit and a construction method for removing ineffective explosives in roof blasting holes for coal mine impact prevention to solve the problems raised in the above background technique. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: A drill bit for removing ineffective explosives in roof blasting holes for coal mine impact prevention, including a drill sleeve, a water guiding hole is provided in the center of the drill sleeve, circumferentially uniformly distributed accommodation grooves are provided on the side wall at the bottom end of the drill sleeve, a guard plate is installed on the outer side of the side wall of the drill sleeve between adjacent accommodation grooves, a stabilizing disc frame is installed at the center of the bottom end of the drill sleeve, and a wall grinding mechanism is also installed on the accommodation groove. The wall grinding mechanism includes a first telescopic mechanism radially installed on the accommodation groove, an axial second telescopic mechanism is installed at the outer end of the first telescopic mechanism, a grinding plate is installed at the lower end of the second telescopic mechanism, and the grinding plate includes a first grinding plate arranged axially and a second grinding plate arranged radially and installed at the lower end of the first grinding plate.

[0006] Further, preferably, the stabilizing disc frame includes a stabilizing disc, a plurality of guide rods are connected to the upper end of the stabilizing disc, guide holes corresponding to the guide rods are provided at the lower end of the drill sleeve, and the upper end of the stabilizing disc is also connected to the lower end of the drill sleeve through a second spring.

[0007] Further, preferably, through holes are densely arranged on the stabilizing disc surface from the outside to the inside, a T-shaped rod passes through the through holes, and the upper end of the T-shaped rod is connected to the stabilizing disc surface through a first spring.

[0008] Further, preferably, a plurality of parallel annular grooves are provided on the rod wall of the lower end of the T-shaped rod, and annular edges are formed between adjacent annular grooves.

[0009] Further, preferably, a shock pad is installed at the lower end of the stabilizing disk.

[0010] Further, preferably, a water-dispersing head is connected to the lower end of the water guiding hole in the drill bushing.

[0011] Further, preferably, the first telescoping mechanism includes a first square block and a second square block. The first square block is fixed on the accommodating groove. A first square cavity is provided in the second square block and is slidably connected to the outer end of the first square block. A first flow channel communicating with the first square cavity is provided in the first square block, and an oil cylinder communicating with the first flow channel is also fixed on the first square block.

[0012] Further, preferably, the second telescoping mechanism includes a first square rod and a second square rod. The upper end of the first square rod penetrates and is fixed on the second square block. A second square cavity is provided in the second square rod and is slidably connected to the lower end of the first square rod. A second flow channel communicating with the second square cavity is provided in the first square rod, and an oil cylinder communicating with the second flow channel is also fixed on the first square rod.

[0013] Further, preferably, the first grinding plate is fixed on the outer wall of the second square rod, and the second grinding plate is fixed on the lower end of the second square rod.

[0014] A construction method for extracting ineffective explosive in a blasting hole of a coal mine anti-bumping roof, which includes:

[0015] Step 1: Install the drill bushing on the drill rod, and guide the drill bushing to the area of ineffective explosive in the blasting hole through the drill rod;

[0016] Step 2: Spray water to humidify the blasting hole at the area of ineffective explosive through the water guiding hole;

[0017] Step 3: The first telescoping mechanism adjusts the second telescoping mechanism to move towards the wall of the blasting hole. At the same time, the drill rod drives the drill bushing to rotate, so that the grinding plate grinds the wall of the blasting hole. Then, the second telescoping mechanism controls the grinding plate to move towards the ineffective explosive, and grinds the wall of the blasting hole at the area of ineffective explosive again;

[0018] Step 4: When the lower end of the second grinding plate corresponds to the lower end of the ineffective explosive, the first telescoping mechanism adjusts the second telescoping mechanism to approach the ineffective explosive, so that the ineffective explosive falls on the upper end surface of the second grinding plate;

[0019] Step 5: The second telescoping mechanism is adjusted to drive the ineffective explosive into the enclosure of the guard plate, and then the drill rod drives the drill bushing to export from the blasting hole to take out the ineffective explosive.

[0020] Compared with the prior art, the present invention provides a drill bit and a construction method for extracting ineffective explosive in a blasting hole of a coal mine anti-bumping roof, and has the following beneficial effects:

[0021] In the present invention, when taking out the ineffective explosive in the blasting hole, after introducing the hole wall grinding mechanism to the upper end of the ineffective explosive, first control the grinding plate to move in the radial direction through the first telescopic mechanism, and at the same time control the drill sleeve to rotate. The grinding plate grinds the hole wall of the corresponding blasting hole at this place. Then, cooperate with the second telescopic mechanism to control the grinding plate to move in the axial direction, and gradually grind the hole wall of the blasting hole corresponding to the position of the ineffective explosive, thereby greatly reducing the friction with the surface of the ineffective explosive. When the lower end of the second grinding plate corresponds to the lower end of the ineffective explosive, control the second grinding plate to lean against the lower end of the ineffective explosive through the first telescopic mechanism, support the ineffective explosive through the upper end of the second grinding plate, and then control the ineffective explosive to enter the surrounded range of the guard plate through the second telescopic mechanism to complete the removal of the ineffective explosive, improving the operation efficiency.

[0022] In the present invention, under the combined control of the first telescopic mechanism and the second telescopic mechanism, the grinding plate can be located inside the guard plate, so that when the drill sleeve extends into the blasting hole, it is smoother. Through the guard plate sleeved outside the ineffective explosive, it can avoid the friction between the taken-out ineffective explosive and the inner wall of the blasting hole, effectively protect the ineffective explosive, reduce the danger during the process of taking out the ineffective explosive in the blasting hole, and improve the safety of taking out the ineffective explosive.

[0023] In the present invention, through the setting of the stable disc frame, the upper end of the ineffective explosive can be better fixed, so that the upper and lower ends of the ineffective explosive are effectively fixed, reducing the vibration effect during the taking-out process of the ineffective explosive and improving the safety of taking out the ineffective explosive. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0025] Figure 2 is a schematic diagram of the water guiding hole structure of the present invention;

[0026] Figure 3 is Figure 2 the A-A structure schematic diagram of

[0027] Figure 4 is Figure 2 the B-B structure schematic diagram of

[0028] Figure 5 is a schematic diagram of the uniform dispersion head structure of the present invention;

[0029] Figure 6 is a schematic diagram of the stable disc frame structure of the present invention;

[0030] Figure 7 is a schematic diagram of the sectional structure of the hole wall grinding mechanism of the present invention;

[0031] Figure 8Schematic diagram of the stabilizing disk structure of the present invention;

[0032] Figure 9 Schematic diagram of the through-hole structure of the present invention;

[0033] Figure 10 Schematic diagram of the shock-absorbing pad structure of the present invention;

[0034] Figure 11 is Figure 10 Schematic diagram of the structure at position C of

[0035] Figure 12 Schematic diagram of the wall-grinding mechanism structure of the present invention;

[0036] In the figure: 1, drill bushing; 2, guard plate; 3, wall-grinding mechanism; 4, dispersion head; 5, stabilizing disk frame; 11, water guide hole; 12, accommodating groove; 13, guiding hole; 31, first telescopic mechanism; 32, second telescopic mechanism; 33, grinding plate; 311, first square block; 312, first oil cylinder; 313, second square block; 321, first square rod; 322, second square rod; 323, second oil cylinder; 3111, first flow channel; 3131, first square cavity; 3211, second flow channel; 3221, second square cavity; 331, first grinding plate; 332, second grinding plate; 51, stabilizing disk; 52, T-shaped rod; 53, first spring; 54, shock-absorbing pad; 55, guiding rod; 56, second spring; 511, through-hole; 521, annular groove; 522, annular rib. Detailed implementation manners

[0037] Referring to Figures 1 - 12 , the present invention provides a technical solution: a drill bit for removing explosive when the explosive fails in a coal mine roofburst blasting hole, including a drill bushing 1. A water guide hole 11 is provided at the center of the drill bushing 1. The side wall at the bottom end of the drill bushing 1 is provided with circumferentially uniformly distributed accommodating grooves 12. A guard plate 2 is installed on the outer side of the side wall of the drill bushing 1 between adjacent accommodating grooves 12. A stabilizing disk frame 5 is installed at the center of the bottom end of the drill bushing 1. A wall-grinding mechanism 3 is also installed on the accommodating groove 12. The wall-grinding mechanism 3 includes a first telescopic mechanism 31, which is radially installed on the accommodating groove 12. An axial second telescopic mechanism 32 is installed at the outer end of the first telescopic mechanism 31. A grinding plate 33 is installed at the lower end of the second telescopic mechanism 32. The grinding plate 33 includes an axially arranged first grinding plate 331 and a radially arranged second grinding plate 332 installed at the lower end of the first grinding plate 331. Among them, in combination with Figure 1As shown in the figure, under the coordinated control of the first telescopic mechanism 31 and the second telescopic mechanism 32, the grinding plate 33 can be located inside the guard plate 2, so that it is smoother when the drill sleeve 1 extends into the blasting hole. At the same time, the guard plate 2 is in an arc structure, which also increases the cross-sectional area range surrounded by the guard plate 2. In addition, the guard plate 2 sleeved outside the ineffective explosive can prevent the taken-out ineffective explosive from rubbing against the inner wall of the blasting hole, effectively protecting the ineffective explosive, reducing the danger during the process of taking out the ineffective explosive in the blasting hole, and improving the safety of taking out the ineffective explosive. Among them, when taking out the ineffective explosive in the blasting hole, after the grinding wall mechanism 3 is introduced to the upper end of the ineffective explosive, first control the grinding plate 33 to move in the radial direction through the first telescopic mechanism 31, and at the same time control the drill sleeve 1 to rotate. The grinding plate 33 grinds the corresponding hole wall of the blasting hole at this place. Then, cooperate with the second telescopic mechanism 32 to control the grinding plate 33 to move in the axial direction, and the hole wall of the blasting hole corresponding to the ineffective explosive can be gradually ground, so as to greatly reduce the friction with the surface of the ineffective explosive. When the lower end of the second grinding plate 332 corresponds to the lower end of the ineffective explosive, control the second grinding plate 332 to lean against the lower end of the ineffective explosive through the first telescopic mechanism 31, support the ineffective explosive through the upper end of the second grinding plate 332, and then control the ineffective explosive to enter the surrounded range of the guard plate 2 through the second telescopic mechanism 32 to complete the removal of the ineffective explosive. Among them, through the setting of the stable disk frame 5, the upper end of the ineffective explosive can be better fixed, so that the upper and lower ends of the ineffective explosive are effectively fixed, reducing the vibration effect during the taking-out process of the ineffective explosive and improving the safety of taking out the ineffective explosive.

[0038] In this embodiment, the stable disk frame 5 includes a stable disk 51. A plurality of guide rods 55 are connected to the upper end of the stable disk 51. The lower end of the drill sleeve 1 is provided with guide holes 13 corresponding to the guide rods 55 for sliding connection. The upper end of the stable disk 51 is also connected to the lower end of the drill sleeve 1 through a second spring 56. When the ineffective explosive presses against the stable disk 51 to compress the second spring 56, the elastic force of the second spring 56 presses on the upper end of the ineffective explosive, clamping and fixing the ineffective explosive on the second grinding plate 332.

[0039] In this embodiment, through holes 511 are densely arranged on the stable disk 51 from the outside to the inside. A T-shaped rod 51 passes through the through holes 511. The upper end of the T-shaped rod 51 is connected to the disk surface of the stable disk 51 through a first spring 53. When the ineffective explosive presses against the stable disk 51, the upper end of the ineffective explosive can compress the T-shaped rod 51. The T-shaped rods 51 that are not compressed or compressed to different degrees and are in contact with the ineffective explosive can limit the direction of the ineffective explosive deviating from the axial direction, thereby fixing the ineffective explosive.

[0040] In this embodiment, a plurality of parallel annular grooves 521 are provided on the lower rod wall of the T-shaped rod 51, and annular ridges 522 are formed between adjacent annular grooves 521, which increases the roughness of the side contact between the T-shaped rod 51 and the side surface, grooves, and gully areas of the failed explosive, and improves the stability of fixing the failed explosive.

[0041] In this embodiment, a shock-absorbing pad 54 is installed at the lower end of the stabilizing disc 51 to reduce the vibration effect on the failed explosive.

[0042] In this embodiment, the lower end of the water guide hole 11 in the drill sleeve 1 is connected to a dispersion head 4 to cool down the failed explosive during the process of wetting and grinding the wall of the blasting hole.

[0043] In this embodiment, the first telescoping mechanism 31 includes a first square block 311 and a second square block 313. The first square block 311 is fixed on the accommodating groove 12. A first square cavity 3131 is formed in the second square block 313 and is slidably connected to the outer end of the first square block 311. A first flow channel 3111 communicating with the first square cavity 3131 is provided in the first square block 311, and an oil cylinder 312 communicating with the first flow channel 3111 is further fixed on the first square block 311.

[0044] In this embodiment, the second telescoping mechanism 32 includes a first square rod 321 and a second square rod 322. The upper end of the first square rod 321 penetrates and is fixed on the second square block 313. A second square cavity 3221 is formed in the second square rod 322 and is slidably connected to the lower end of the first square rod 321. A second flow channel 3211 communicating with the second square cavity 3221 is provided in the first square rod 321, and an oil cylinder 323 communicating with the second flow channel 3211 is further fixed on the first square rod 321.

[0045] In this embodiment, the first grinding plate 331 is fixed on the outer wall of the second square rod 22, and the second grinding plate 332 is fixed on the lower end of the second square rod 22.

[0046] In specific implementation, it includes:

[0047] Step 1: Install the drill sleeve 1 on the drill rod, and guide the drill sleeve 1 to the area of the failed explosive in the blasting hole through the drill rod. When there is a certain obstruction during the introduction into the blasting hole, the grinding plate 33 can be adjusted by the second telescoping mechanism 32 and / or the first telescoping mechanism 31 for grinding and repair, so as to safely introduce it to the area of the failed explosive in the blasting hole;

[0048] Step 2: Spray water to humidify the blasting hole at the area of the failed explosive through the water guide hole 11;

[0049] Step 3: The telescopic mechanism 1 (31) adjusts the telescopic mechanism 2 (32) to move towards the wall of the blasting hole. At the same time, the drill pipe drives the drill sleeve 1 to rotate, so that the grinding plate 33 grinds the wall of the blasting hole. Then, the telescopic mechanism 2 (32) controls the grinding plate 33 to move towards the direction of the ineffective explosive, and grinds the wall of the blasting hole in the area of the ineffective explosive again;

[0050] Step 4: When the lower end of the second grinding plate 332 corresponds to the lower end of the ineffective explosive, the telescopic mechanism 1 (31) adjusts the telescopic mechanism 2 (32) to approach the ineffective explosive, so that the ineffective explosive falls on the upper end surface of the second grinding plate 332;

[0051] Step 5: The telescopic mechanism 2 (32) is adjusted to drive the ineffective explosive into the enclosure of the guard plate 2, and then the drill pipe drives the drill sleeve 1 to lead out of the blasting hole to take out the ineffective explosive.

[0052] The above is only a specific and preferred embodiment of the invention, but the protection scope of the invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the invention, according to the technical solution of the invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the invention.

Claims

1. The drill bit for removing explosive when the explosive in the roof blasting borehole for coal mine rock burst prevention fails, including a drill sleeve (1), is characterized in that, A water guiding hole (11) is provided at the center of the drill bushing (1). A plurality of accommodating grooves (12) evenly distributed in the circumferential direction are provided on the side wall at the bottom end of the drill bushing (1). A guard plate (2) is installed on the outer side of the side wall of the drill bushing (1) between adjacent accommodating grooves (12). A stabilizing disc frame (5) is installed at the center of the bottom end of the drill bushing (1). A wall grinding mechanism (3) is also installed on the accommodating groove (12). The wall grinding mechanism (3) includes a first telescopic mechanism (31). The first telescopic mechanism (31) is radially installed on the accommodating groove (12). An axial second telescopic mechanism (32) is installed at the outer end of the first telescopic mechanism (31). A grinding plate (33) is installed at the lower end of the second telescopic mechanism (32). The grinding plate (33) includes an axially arranged first grinding plate (331) and a radially arranged second grinding plate (332) installed at the lower end of the first grinding plate (331).

2. The drill bit for removing explosive with explosive failure in the roof blasting borehole for preventing rock bursts in coal mines according to claim 1, wherein The stabilizing disc frame (5) includes a stabilizing disc (51). A plurality of guide rods (55) are connected to the upper end of the stabilizing disc (51). A guide hole (13) corresponding to the guide rod (55) for sliding connection is provided at the lower end of the drill bushing (1). The upper end of the stabilizing disc (51) is also connected to the lower end of the drill bushing (1) through a second spring (56).

3. The drill bit for extracting explosive with explosive failure in the roof blasting borehole for preventing rock bursts in coal mines according to claim 2, characterized in that, A plurality of through holes (511) are densely distributed on the disc surface of the stabilizing disc (51) from the outside to the inside. A T-shaped rod (51) penetrates through the through hole (511). The upper end of the T-shaped rod (51) is connected to the disc surface of the stabilizing disc (51) through a first spring (53).

4. The drill bit for removing explosive with explosive failure in the roof blasting borehole for preventing rock bursts in coal mines according to claim 3, characterized in that, A plurality of parallel annular grooves (521) are provided on the rod wall at the lower end of the T-shaped rod (51). An annular rib (522) is formed between adjacent annular grooves (521).

5. The bit for extracting explosive with explosive failure in the roof blasting borehole for coal mine rock burst prevention according to claim 2, characterized in that, A shock pad (54) is installed at the lower end of the stabilizing disc (51).

6. The drill bit for extracting explosive with explosive failure in the roof blasting hole for preventing rock bursts in coal mines according to claim 1, characterized in that, The lower end of the water guiding hole (11) in the drill bushing (1) is connected to a dispersion head (4).

7. The drill bit for removing explosive of failed explosive in roof blasting boreholes for coal mine rock burst prevention according to claim 1, characterized in that, The first telescopic mechanism (31) includes a first square block (311) and a second square block (313). The first square block (311) is fixed on the accommodating groove (12). A first square cavity (3131) for sliding connection with the outer end of the first square block (311) is provided in the second square block (313). A first flow channel (3111) communicating with the first square cavity (3131) is provided in the first square block (311). An oil cylinder one (312) communicating with the first flow channel (3111) is also fixed on the first square block (311).

8. The drill bit for extracting explosive with explosive failure in the roof blasting borehole for coal mine shock prevention according to claim 7, characterized in that, The second telescopic mechanism (32) includes a first square rod (321) and a second square rod (322). The upper end of the first square rod (321) penetrates and is fixed on the second square block (313). A second square cavity (3221) for sliding connection with the lower end of the first square rod (321) is provided in the second square rod (322). A second flow channel (3211) communicating with the second square cavity (3221) is provided in the first square rod (321). An oil cylinder two (323) communicating with the second flow channel (3211) is also fixed on the first square rod (321).

9. The drill bit for removing explosive with failed explosive in the roof blasting borehole for preventing rock bursts in coal mines according to claim 8, characterized in that, The first grinding plate (331) is fixed on the outer wall of the second square rod (22). The second grinding plate (332) is fixed on the lower end of the second square rod (22).

10. Construction method for removing explosive in case of explosive failure in roof blasting borehole for coal mine bump prevention, which uses the drill bit for removing explosive in case of explosive failure in roof blasting borehole for coal mine bump prevention as described in claims 1-9, characterized in that, It includes: Step 1: Install the drill bushing (1) on the drill rod, and guide the drill bushing (1) to the area of the failed explosive in the blasting hole through the drill rod; Step 2: Spray water to humidify the blast holes at the area of the ineffective explosive through the water guide holes (11). Step 3: The telescopic mechanism 1 (31) adjusts the telescopic mechanism 2 (32) to move towards the blast hole wall. Meanwhile, the drill pipe drives the drill sleeve (1) to rotate, so that the grinding plate (33) grinds the blast hole wall. Then, the telescopic mechanism 2 (32) controls the grinding plate (33) to move towards the ineffective explosive direction and grinds the blast hole wall at the area of the ineffective explosive again. Step 4: When the lower end of the second grinding plate (332) corresponds to the lower end of the ineffective explosive, the telescopic mechanism 1 (31) adjusts the telescopic mechanism 2 (32) to move closer to the ineffective explosive, so that the ineffective explosive falls on the upper end surface of the second grinding plate (332). Step 5: The telescopic mechanism 2 (32) adjusts to drive the ineffective explosive into the enclosure of the guard plate (2), and then the drill pipe drives the drill sleeve (1) to lead out of the blast hole to take out the ineffective explosive.

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