Drill bit for coal seam anti-reflection

Abstract

The utility model discloses a drill bit for coal seam anti-reflection. The drill bit comprises a drill bit body and a drill rod. The drill rod is arranged at the rear end of the drill bit body, the inner hole is formed in the drill rod, the inner side of the inner hole is communicated with the outer side of the drill rod through the first through holes, the sprayers are arranged in the first through holes, the movable mechanism is arranged at the front end in the inner hole, and the movable mechanism comprises the movable cylinder, the spring, the second through hole, the connecting rod, the covering plate and the like. Under mutual cooperation, through movement of the movable cylinder, the second through hole communicates with the first through hole, water can be sprayed out easily, secondary hole forming and reaming of a coal seam drill hole are achieved, no less than four sets of auxiliary mechanisms are arranged on the outer side of the drill rod at equal intervals, during water spraying and punching, the periphery can be physically broken through a breaking rod in the drill rod, and the drilling efficiency is improved. And the reaming effect can be effectively improved, and high practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the field related to enhancing the permeability of coal seams, in particular to a drill bit for enhancing the permeability of coal seams. Background Technique

[0002] Enhancing the permeability of coal seams refers to increasing the gas permeability of coal seams through various technical means, enabling gases (such as methane) to flow out of the coal seams more smoothly. This can effectively improve the coal mining efficiency and safety, reduce the risk of gas accidents. Common coal seam permeability enhancement technologies include mining protective layers, deep hole pre-splitting blasting, hydraulic fracturing, hydraulic punching, slotting, and dense drilling, etc.

[0003] When enhancing the permeability of coal seams, usually first drill holes through a drill bit, and then impact and expand the drill holes through gas or water.

[0004] Common hydraulic punching has deficiencies such as uneven coal unloading and small expansion range, and is prone to voids and local gas accumulation, resulting in serious construction blowout phenomena, which may cause certain inconveniences and safety hazards, and may also affect work efficiency and prolong the construction period, having certain limitations. Content of the Utility Model

[0005] Therefore, to solve the above deficiencies, the utility model provides a drill bit for enhancing the permeability of coal seams.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions: A drill bit for enhancing the permeability of coal seams includes a drill bit body, and also includes a drill rod provided at the rear end of the drill bit body;

[0007] An inner hole is provided in the drill rod, an activity mechanism is provided at the front end inside the inner hole, and not less than four groups of auxiliary mechanisms are provided at equal intervals on the outer side of the drill rod.

[0008] Preferably, a baffle is provided at the rear end inside the inner hole, not less than four groups of through holes one are provided at equal intervals at the front and rear ends inside, and are communicated with the outside through the through holes one. A group of spray nozzles are provided at positions close to the outer side inside the through holes one.

[0009] Preferably, the activity mechanism includes an activity cylinder, a spring, through holes two, a connecting rod, a covering plate, a sliding groove, and a rack. A group of activity cylinders are provided at the front end inside the inner hole. The front end of the activity cylinder is connected to the front inside of the inner hole through a spring. Not less than four groups of through holes two are provided at equal intervals at the front and rear ends outside the activity cylinder. A group of connecting rods are connected to the front inside of the activity cylinder. The rear end of the connecting rod is connected to a group of covering plates. A number of groups of sliding grooves are provided at equal intervals on the activity cylinder. Racks are provided at the front ends inside the sliding grooves.

[0010] Preferably, the auxiliary mechanism includes a groove, a crushing rod and a half gear. There are no less than four groups of grooves arranged at equal intervals on the outer side of the drill rod. A set of crushing rods are connected to the front ends inside the grooves, and half gears are provided at the front ends of the crushing rods.

[0011] Preferably, the bottom end of the half gear extends into the chute and can mesh with the rack.

[0012] Preferably, a set of convex teeth are provided at both the left and right ends of the crushing rod.

[0013] Preferably, a through hole is provided in the middle of the baffle plate, and the covering plate can completely cover the through hole.

[0014] Preferably, the through hole 1 and the groove are arranged alternately.

[0015] Advantages of the present utility model:

[0016] In the present utility model, a drill rod is provided at the rear end of the drill bit body. An inner hole is provided in the drill rod. The inner side of the inner hole is communicated with the outer side of the drill rod through a number of groups of through holes 1. Sprayers are provided in the through holes 1. And a movable mechanism is provided at the front end inside the inner hole. The movable mechanism includes components such as a movable cylinder, a spring, a through hole 2, a connecting rod and a covering plate. Through the cooperation of each other, the through hole 2 can be communicated with the through hole 1 by the movement of the movable cylinder, which is beneficial to spraying water and realizing secondary cavity formation and hole expansion for the coal seam drilling. And there are no less than four groups of auxiliary mechanisms arranged at equal intervals on the outer side of the drill rod. During the water spraying and stamping, the surrounding can be physically broken by the crushing rods inside, which can effectively improve the hole expansion effect and has strong practicability. Description of the Drawings

[0017] Figure 1 is the left view structural schematic diagram of the present utility model;

[0018] Figure 2 is the left view structural schematic diagram of the inside of the inner hole of the present utility model;

[0019] Figure 3 is the partial structural schematic diagram of the inside of the auxiliary mechanism of the present utility model;

[0020] Figure 4 is the cross-sectional structural schematic diagram of the drill rod of the present utility model.

[0021] Wherein: drill bit body - 1, drill rod - 2, inner hole - 21, movable mechanism - 22, auxiliary mechanism - 23, baffle plate - 211, through hole 1 - 212, sprayer - 213, movable cylinder - 221, spring - 222, through hole 2 - 223, connecting rod - 224, covering plate - 225, chute - 226, rack - 227, groove - 231, crushing rod - 232, half gear - 233. Specific Embodiments

[0022] To further explain the technical solution of the present utility model, the following will be elaborated in detail through specific embodiments.

[0023] Please refer to Figures 1-4 , the present utility model provides a drill bit for enhancing coal seam permeability, including a drill bit body 1, and further including a drill pipe 2 provided at the rear end of the drill bit body 1;

[0024] An inner hole 21 is provided in the drill pipe 2, an active mechanism 22 is provided at the front end inside the inner hole 21, and not less than four groups of auxiliary mechanisms 23 are equidistantly provided on the outer side of the drill pipe 2;

[0025] A baffle 211 is installed at the rear end inside the inner hole 21, a water-passing through hole is provided in the middle of the baffle 211, and not less than four groups of through holes one 212 are equidistantly provided at the front and rear ends inside the inner hole 21, and can be communicated with the outside through the through holes one 212. A set of spray nozzles 213 are provided at positions close to the outside in the through holes one 212, facilitating the spraying of water.

[0026] Please refer to Figures 2-4 , the present utility model provides a drill bit for enhancing coal seam permeability. The active mechanism 22 includes an active cylinder 221, a spring 222, a through hole two 223, a connecting rod 224, a covering plate 225, a sliding groove 226 and a rack 227. A set of active cylinders 221 are provided at the front end inside the inner hole 21. The front end of the active cylinder 221 is connected to the front inside of the inner hole 21 through a spring 222. The active cylinder 221 can be driven to retreat and reset by the elastic force released by the spring 222. Not less than four groups of through holes two 223 are equidistantly provided at the front and rear ends outside the active cylinder 221. When the active cylinder 221 moves to the front end inside the inner hole 21, the through holes two 223 can be communicated with the through holes one 212. A set of connecting rods 224 are connected to the front inside of the active cylinder 221, and a set of covering plates 225 are connected to the rear ends of the connecting rods 224. The covering plates 225 can completely cover the through holes, blocking the water flow. A number of groups of sliding grooves 226 are equidistantly provided on the active cylinder 221, and racks 227 are provided at the front ends inside the sliding grooves 226.

[0027] Please refer to Figures 1-4 , the present utility model provides a drill bit for enhancing coal seam permeability. The auxiliary mechanism 23 includes a groove 231, a crushing rod 232 and a semi-gear 233. Not less than four groups of grooves 231 are equidistantly provided on the outer side of the drill pipe 2. The through holes one 212 and the grooves 231 are arranged in an alternating manner to avoid mutual influence. A set of crushing rods 232 are connected to the front ends inside the grooves 231, and semi-gears 233 are provided at the front ends of the crushing rods 232. Among them, a set of convex teeth are provided at both the left and right ends of the crushing rod 232, which is beneficial to the expansion of the coal seam drilling. The bottom end of the semi-gear 233 extends into the sliding groove 226 and can be meshed with the rack 227. When the active cylinder 221 moves forward, the semi-gear 233 and the crushing rod 232 can be driven to rotate through the rack 227, so that the crushing rod 232 expands outside the drill pipe 2, and the drilling hole can be enlarged.

[0028] The working principle is as follows:

[0029] Place the present utility model in a suitable position for use. During use, the drill bit body 1 can be moved to a suitable position for drilling, and then water is injected into the inner hole 21. The water can impact the covering plate 225, drive the movable cylinder 221 to squeeze the spring 222 and move forward through the connecting rod 224. When the movable cylinder 221 moves forward, it can drive the semi-gear 233 and the crushing rod 232 to rotate through the rack 227, so that the crushing rod 232 extends outside the drill pipe 2, facilitating the expansion of the hole during drilling. When the movable cylinder 221 moves to the front end inside the inner hole 21, the second through hole 223 can communicate with the first through hole 212, and the water can flow into the first through hole 212 and be sprayed out through the nozzle 213 to perform the hole expansion operation on the drilled hole.

[0030] The above are only the preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A drill bit for increasing coal seam permeability, comprising a drill bit body (1); Features: It also includes a drill rod (2) arranged at the rear end of the drill bit body (1); An inner hole (21) is provided in the drill rod (2), a movable mechanism (22) is provided at the front end of the inner hole (21), and no less than four groups of auxiliary mechanisms (23) are provided at equal intervals on the outer side of the drill rod (2).

2. A drill bit for increasing coal seam permeability according to claim 1, characterized in that: The inner rear end of the inner hole (21) is provided with a baffle (211), and at least four groups of through holes (212) are provided at equal intervals at the front and rear ends of the inner hole (21), and are connected to the outside through the through holes (212), and a group of nozzles (213) are provided at positions close to the outside of the through holes (212).

3. A drill bit for increasing coal seam permeability according to claim 2, characterized in that: The movable mechanism (22) comprises a movable cylinder (221), a spring (222), a second through hole (223), a connecting rod (224), a covering plate (225), a slide groove (226) and a rack (227). A group of movable cylinders (221) are provided at the front end of the inner hole (21). The front end of the movable cylinder (221) is connected to the front end of the inner hole (21) through the spring (222). No less than four groups of second through holes (223) are provided at equal intervals at the front and rear ends of the movable cylinder (221). The front end of the movable cylinder (221) is connected to a group of connecting rods (224). The rear end of the connecting rods (224) is connected to a group of covering plates (225). The movable cylinder (221) is provided with a plurality of groups of slide grooves (226) at equal intervals. The front ends of the slide grooves (226) are provided with racks (227).

4. A drill bit for increasing coal seam permeability according to claim 3, characterized in that: The auxiliary mechanism (23) comprises grooves (231), breaking rods (232) and half gears (233). No less than four groups of grooves (231) are arranged at equal intervals on the outer side of the drill rod (2). The front ends of the grooves (231) are all connected to a group of breaking rods (232). The front ends of the breaking rods (232) are all provided with half gears (233).

5. A drill bit for increasing coal seam permeability according to claim 4, characterized in that: The bottom end of the half gear (233) extends into the slide groove (226) and can mesh with the rack (227).

6. A drill bit for increasing coal seam permeability according to claim 4, characterized in that: The breaker rod (232) is provided with a set of protruding teeth at both left and right ends.

7. A drill bit for increasing coal seam permeability according to claim 3, characterized in that: A through hole is provided at the middle end of the baffle plate (211), and the covering plate (225) can completely cover the through hole.

8. A drill bit for increasing coal seam permeability according to claim 4, characterized in that: The through holes (212) and the grooves (231) are arranged in an alternating manner.

Images