CN218265818U - Synchronous follow-up connecting structure of drill bit and sleeve in follow-up pipe drilling construction - Google Patents

Abstract

A drill bit and sleeve synchronous follow-up connecting structure comprises a drill bit and a sleeve assembly, wherein the drill bit is integrally of a cylindrical structure, a plurality of slag discharge grooves are uniformly formed in the circumference of the drill bit in a penetrating manner, a drilling claw is formed between any two adjacent slag discharge grooves, and a pipe clamping groove is formed in the center of the circumference of each drilling claw; the sleeve assembly comprises a main drill sleeve and an auxiliary drill sleeve, wherein a rotary groove is formed in the outer circumference of the main drill sleeve, a rotary raised line is arranged on the inner circumference of the auxiliary drill sleeve, and one end of the main drill sleeve is inserted into the auxiliary drill sleeve and then is rotatably embedded with the rotary raised line through the rotary groove; the inner circumferential wall of the main drill sleeve is also uniformly provided with a plurality of convex parts corresponding to the pipe clamping grooves, and the sleeve pipe assembly is detachably sleeved with the drill bit through the nesting fit between the convex parts and the pipe clamping grooves. This application has really realized the drill bit drilling, the synchronous follow-up in hole under the sleeve pipe, has really accomplished synchronous pipe following and has crept into, provides technical guarantee for the safe construction operation of coal mine excavation.

Description

Synchronous follow-up connecting structure of drill bit and sleeve in follow-up pipe drilling construction

Technical Field

The utility model relates to a coal mine equipment technical field specifically is a colliery is drill bit and sheathed tube synchronous follow-up connection structure in pipe-following drilling construction in pit.

Background

The underground geological conditions of the coal mine are complex and variable, in order to ensure the safety of a working face of a mining area and facilitate the entrance of large-scale mining equipment, high-pressure grouting reinforcement needs to be carried out on coal bed walls of coal beds around the mining area, the concrete operation is to drill holes in the coal bed walls, generally drill holes in multiple stages, the depths are generally 50 meters, 100 meters and 150 meters, the holes correspond to different apertures respectively, and after one stage of drilling is finished, namely, a casing is arranged below the holes, and then high-pressure grouting is carried out. Due to the fact that the drilling depth is large, after the drill rod is pulled out of the drill hole, local hole collapse, hole shrinkage and the like can occur in the drill hole under the action of compressive stress, and great trouble is caused to casing running. At present, the common mode for solving the problem is the following drilling, but the following drilling in the prior art generally needs to rely on a special following drilling device, and still has no inevitable three steps of drilling by a drill rod, withdrawing the drill rod and loading and delivering a casing, the efficiency is still not high, the synchronization of drilling by the drill rod and the lower hole of the casing cannot be really realized, and the problem that how to realize the synchronous drilling and the casing running is always unsolved in the field is also solved.

This is the problem, and the core is that true synchronous cooperative connection between the casing and the drill bit cannot be realized, that is, if the drill bit realizes the connection problem with the casing while rotating and drilling, the contradiction of the problem lies in that: 1, a drill bit rotates at a high speed, a sleeve cannot rotate after penetrating into a drill hole, the rotation of the sleeve is not practical, and the two states are asynchronous; 2 if the sleeve is sleeved on the drill bit, the outer diameter is necessarily larger than the drill bit, which results in that the inner diameter of the drill hole drilled by the drill bit is not larger than the outer diameter of the sleeve, so that the sleeve cannot enter the drill hole at all. Therefore, how to really realize the synchronization of drilling of the drill bit and casing pipe lower hole and how to simplify the existing three-step flow into one-step flow becomes a problem which can not be effectively solved in the field at present.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims to provide a colliery is in pit with pipe drilling construction in drill bit and sheathed tube synchronous connection structure of following, increase between drill bit and sleeve pipe and set up a sleeve pipe subassembly, improve the structure of drill bit simultaneously, finally overcome the contradiction point of above-mentioned problem, realized drill bit drilling, the synchronization in hole under the sleeve pipe, really accomplished synchronous following pipe and creep into.

The utility model discloses a solve the technical scheme who takes of above-mentioned problem and be:

a synchronous follow-up connection structure of a drill bit and a sleeve in the pipe follow-up drilling construction comprises a drill bit and a sleeve assembly,

the drill bit is integrally of a cylindrical structure, a plurality of slag discharge grooves are uniformly formed in the circumference of the drill bit in a penetrating manner, a drilling claw is formed between any two adjacent slag discharge grooves, and a pipe clamping groove used for clamping a sleeve pipe assembly is formed in the center of the circumferential surface of each drilling claw;

the casing pipe assembly comprises a main drill sleeve and an auxiliary drill sleeve which are rotatably sleeved together, a rotating groove is formed in the outer circumference of the main drill sleeve, a rotating convex strip matched with the rotating groove is arranged in the inner circumference of the auxiliary drill sleeve, and one end of the main drill sleeve is inserted into the auxiliary drill sleeve and then is rotatably embedded with the rotating convex strip through the rotating groove so that the main drill sleeve and the auxiliary drill sleeve can rotate relatively through the matching of the rotating groove and the rotating convex strip;

the inner circle peripheral wall of the main drill sleeve is evenly provided with a plurality of convex parts corresponding to the pipe clamping grooves, and the sleeve pipe assembly is detachably sleeved with the drill bit through nesting matching between the convex parts and the pipe clamping grooves.

Preferably, each drilling claw top all protrudes the slag discharging groove and sets up to form a convex cutting end jointly, diamond compact piece has been laid along drill bit direction of rotation on the cutting end.

Preferably, a plurality of cutting heads matched with the drill bit are uniformly distributed on the circumference of the end face of the top end of the main drill bushing.

Preferably, the sleeve assembly has an inner diameter that matches an outer diameter of the drill bit.

Preferably, the top end of the pipe clamping groove is communicated with the end face of the cutting end, and the bottom end of the pipe clamping groove vertically extends downwards to a position close to the bottom of the drilling claw, so that clamping steps are formed between the groove walls at two sides of the pipe clamping groove and the surfaces of the drilling claw and the groove walls at the bottom end of the pipe clamping groove; the sleeve assembly is sleeved on the drill bit from the end part of the drill bit along the pipe clamping groove.

Preferably, the tail end of the auxiliary drill bushing is further connected with a plurality of sections of bushings which are butted together, female threaded connectors for connecting the bushings are arranged on the inner circumference of the tail section of the auxiliary drill bushing, and a male head and a female head for threaded butt joint are respectively arranged at two ends of each section of bushing.

Preferably, the outer diameter of the casing is greater than the outer diameter of the drill bit and less than the outer diameter of the casing assembly.

Compared with the prior art, the utility model discloses following beneficial effect has:

technical scheme, it sets up a sleeve pipe assembly to increase between drill bit and sleeve pipe, improve the structure of drill bit simultaneously, finally overcome prior art, problem about can't realize real synchronous cooperation connection between drill bit and the sleeve pipe, can really realize drill bit drilling, the synchronous follow-up in hole under the sleeve pipe, three-step flow concentration that creeps into with current follow-up becomes one step, synchronous follow-up creeps into really having accomplished, reliable technological basis is provided for coal mine excavation safety construction operation, can greatly improve present underground excavation face drilling all around, the construction operating efficiency of case.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the structure of FIG. 1;

FIG. 4 is a schematic view of the connection of the drill bit and the sleeve assembly;

FIG. 5 is a schematic top view of the structure of FIG. 4;

FIG. 6 is a schematic perspective view of the structure of FIG. 5 taken along section D-D;

FIG. 7 is a schematic view of a sleeve assembly;

FIG. 8 is a schematic view of the main drill bushing;

FIG. 9 is a schematic top view of the main drill bushing;

fig. 10 is a schematic view of the structure of the sub-drill bushing.

The labels in the figure are: 1. the drill bit, 2, a slag discharge groove, 3, a drilling claw, 31, a cutting end, 32, a diamond composite sheet, 4, a pipe clamping groove, 5, a main drilling sleeve, 51, a rotating groove, 6, an auxiliary drilling sleeve, 61, a rotating convex strip, 62, a female threaded connector, 7, a convex part, 8 and a sleeve.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in the figures, the utility model relates to a synchronous follow-up connection structure of a drill bit and a sleeve pipe in follow-up pipe drilling construction, which comprises a drill bit 1 and a sleeve pipe assembly, wherein the drill bit 1 is integrally in a cylindrical structure, the circumference of the drill bit 1 is uniformly penetrated and provided with a plurality of slag discharge grooves 2, a drilling claw 3 is formed between any two adjacent slag discharge grooves 2, and a pipe clamping groove 4 for clamping the sleeve pipe assembly is formed in the center of the circumference of each drilling claw 3;

referring to fig. 1 and 6, in this embodiment, the number of the slag discharge grooves 2 is preferably three, so that three corresponding drilling claws 3 can be formed, the top ends of the drilling claws 3 protrude and extend out of a part of the slag discharge grooves 2, the formed protruding parts are similar to the structure of a conventional three-claw drill bit, a diamond compact 32 is arranged on the protruding parts along the rotation direction, and the diamond compact 32 can be a compact with a whole structure or a plurality of composite disks uniformly distributed on the similar conventional three-claw drill bit.

That is, the top end of each of the drilling claws 3 protrudes out of the slag discharging groove 2 to form a protruding cutting end 31, and the diamond compact 32 is distributed on the cutting end 31 along the rotation direction of the drill bit.

The sleeve assembly comprises a main drill bushing 5 and an auxiliary drill bushing 6 which are rotatably sleeved together, wherein a rotating groove 51 is formed in the outer circumference of the main drill bushing 5, a rotating raised line 61 matched with the rotating groove 51 is arranged in the inner circumference of the auxiliary drill bushing 6, and one end of the main drill bushing 5 is inserted into the auxiliary drill bushing 6 and then is rotatably embedded with the rotating raised line 61 through the rotating groove 51, so that the main drill bushing 5 and the auxiliary drill bushing 6 can rotate relative to each other through the matching of the rotating groove 51 and the rotating raised line 61; the inner circumferential wall of the main drill sleeve 5 is also uniformly provided with a plurality of convex parts 7 corresponding to the positions of the pipe clamping grooves 4, and the sleeve pipe assembly is detachably sleeved with the drill bit 1 through the nesting fit between the convex parts 7 and the pipe clamping grooves 4.

Referring to fig. 2, the top end of the pipe clamping groove 4 is communicated with the end face of the cutting end 31, and the bottom end of the pipe clamping groove vertically extends downwards to a position close to the bottom of the drilling claw 3, so that clamping steps are formed between the groove walls at two sides and the groove wall at the bottom end of the pipe clamping groove 4 and the surface of the drilling claw 1; the sleeve pipe assembly is sleeved on the drill bit from the end part of the drill bit along the pipe clamping groove 4; in addition, as shown in fig. 3, the sleeved main drill sleeve 5 and the auxiliary drill sleeve 6 are basically flush and accommodated between the outer circumference and the inner circumference.

To sum up, the mode for solving the problems in the prior art in the technical scheme of the application is mainly summarized as follows:

the sleeve pipe assembly is additionally arranged between the drill bit 1 and the sleeve pipe 8, the sleeve pipe assembly mainly has two functions, one is that effective connection between the sleeve pipe and the drill bit is realized, and the other is that the problem of asynchronous connection when the drill bit rotates and the sleeve pipe does not move is solved.

Specifically, the core innovation of the technical scheme is as follows:

firstly, in order to realize effective connection between the drill bit and the casing, the drill bit 1 is modified into a cylindrical structure, the outer diameter of the drill bit is consistent with the inner diameter of the casing to be connected, so that the casing assembly can be directly sleeved on the drill bit, and the drill bit 1 is only provided with a structure of a drilling claw 3 and a slag discharging groove 2, so that the drilling function of the drill bit can be basically maintained.

Secondly, on the basis of the improved structure of the drill bit, in order to realize the connection between the drill bit and the casing pipe assembly, a pipe clamping groove 4 is further added on the drill claw 3, as mentioned above, the pipe clamping groove 4 can form a clamping step with the surface of the drill claw 3, meanwhile, the casing pipe assembly, namely the inner circumference of the main drill sleeve 5, is also provided with a convex part 7, and under the matching of the convex part 7 and the pipe clamping groove 4, the sleeving assembly between the casing pipe assembly and the drill bit 1 is realized.

Thirdly, the casing assembly is provided with two sets of main and auxiliary structures, namely a main drill bushing 5 and an auxiliary drill bushing 6, the core of the structure is to solve the problem of rotation cooperation between the drill bushing and the casing, and specifically, as mentioned above, the main drill bushing 5 and the auxiliary drill bushing 6 are rotated relatively through the matching of the rotation groove 51 and the rotation convex strip 61, and the structure can realize the following effects:

the drill bit 1 rotates to directly drive the main drill bushing 5 on the drill bit 1 to rotate through the clamping step, the rotation of the main drill bushing 5 drives the rotation groove 51 to rotate around the rotation convex strip 61 on the auxiliary drill bushing 6 relatively, torque cannot be transmitted between the rotation groove 5 and the rotation convex strip 61, therefore, the auxiliary drill bushing 6 can be fixed, the rotation of the drill bit 1 and the main drill bushing 5 is transmitted to the rotation convex strip 61, and then the rotation is stopped, meanwhile, the clamping connection structure between the rotation groove 51 and the rotation convex strip 61 can enable the auxiliary drill bushing 6 to enable the drill bit 1 and the main drill bushing 5 to move forwards together, and finally, the drill bit is drilled, and the synchronous drilling of a sleeve is realized.

Fourthly, on the basis of the technical scheme, the problem that the outer diameter of the main drill bushing is larger than that of the drill bit 1, and how the drill bit drills and the main drill bushing advances exists is solved skillfully, namely the characteristic that the drill bit 1 drives the main drill bushing 5 to rotate synchronously is fully utilized, and the cutting head 52 is also arranged at the end part of the main drill bushing 5, so that the main drill bushing 5 rotating synchronously becomes an auxiliary drill bit, can drill and punch together with the drill bit 1, directly enlarges the hole diameter of a drilled hole, and ensures that a subsequent casing 8 can enter without obstruction.

The technical scheme of the application formed by the innovative and improved combination finally effectively solves the problem troubled by the prior art.

On the basis of the technical scheme, the embodiment can be further optimized.

Furthermore, a plurality of cutting heads 52 matched with the drill bit 1 are uniformly distributed on the circumference of the end face of the top end of the main drill bushing 5, which mainly serves the fourth innovative improvement.

Further, the inner diameter of the sleeve assembly is matched with the outer diameter of the drill bit 1, and the outer diameter of the sleeve 8 is larger than the outer diameter of the drill bit 1 and smaller than the outer diameter of the sleeve assembly, which mainly serves the third innovative improvement.

In addition, under operating condition, the tail end of vice drill bushing 6 still is connected with a plurality of sections sleeve pipe 8 that dock each other together, circle is provided with female threaded connection head 62 that is used for adapter sleeve 8 in the tail section of vice drill bushing 6, every section the both ends of sleeve pipe 8 are equallyd divide and are provided with public head and female head that is used for the screw thread butt joint respectively, and the thimble group that forms one and drilling depth adaptation is connected to the multinode sleeve pipe, finally goes into the drilling with the thimble group.

The following is a brief description of the working principle of the present technical solution:

as shown in fig. 2, the components are connected into a whole according to the connection shown in the figure, the tail end of the drill bit is connected with the drill rod, the sleeve pipe group is connected to the drill bit through the sleeve pipe component, the drilling and the boring are started, the drilling slag is discharged along with the slag discharge groove 2, enters the space between the sleeve pipe and the drill rod and is discharged along with the spiral rotation of the drill rod (the structure of the drill rod is the same as that of the prior art, so that the additional description is not provided in the figure);

in the drilling process, the rest structures of the drill bit 1 are basically the same as those in the prior art, mainly including high-pressure water injection and slag removal of a center hole, temperature reduction and the like, and are not described again;

and when the drill bit drilling rod drills, the sleeve 8 can synchronously enter the drill hole along with the drill bit 1 until reaching the preset drilling depth, then the drilling machine can be directly operated to draw out the drill bit and the drill bit, referring to fig. 2, the top end of the pipe clamping groove 4 is communicated with the drill claw 3, the drill bit 1 can be directly pushed out along the pipe clamping groove 4 without obstruction, the sleeve assembly and the sleeve group are together remained in the drill hole, then the sleeve pipe is drilled, and the synchronous follow-up of drilling and pipe laying is really realized.

Furthermore, it should be additionally noted that the above structure has an additional advantage:

as shown in fig. 1, after the casing assembly is assembled, the end of the drill bit 1 protrudes from the main drill casing 5 to form an additional protruding portion, that is, the cutting end 31 of the drill bit 1 protrudes from the cutting head 52 of the main drill casing 5 to a portion, and the protruding portion can form a cavity space with a slightly smaller inner diameter (i.e., the outer diameter of the drill bit) at the bottom end of the formed drill hole after the drill bit 1 reaches a preset depth, and the cavity space is necessary to collect fine coal cinder falling from the bottom of the drill hole, so as to prevent the coal cinder from directly entering the casing to affect grouting.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (7)

1. The utility model provides a follow pipe and bore synchronous follow-up connection structure of drill bit and sheathed tube in construction, includes drill bit (1) and bushing assembly, its characterized in that:

the drill bit (1) is integrally of a cylindrical structure, a plurality of slag discharge grooves (2) are uniformly formed in the circumference of the drill bit (1) in a penetrating mode, a drilling claw (3) is formed between any two adjacent slag discharge grooves (2), and a pipe clamping groove (4) used for clamping a sleeve pipe assembly is formed in the center of the circumferential surface of each drilling claw (3);

the casing pipe assembly comprises a main drill sleeve (5) and an auxiliary drill sleeve (6) which are rotatably sleeved together, a rotating groove (51) is formed in the outer circumference of the main drill sleeve (5), a rotating convex strip (61) matched with the rotating groove (51) is arranged in the inner circumference of the auxiliary drill sleeve (6), and one end of the main drill sleeve (5) is inserted into the auxiliary drill sleeve (6) and then is rotatably embedded with the rotating convex strip (61) through the rotating groove (51), so that the main drill sleeve (5) and the auxiliary drill sleeve (6) are relatively rotated through the matching of the rotating groove (51) and the rotating convex strip (61);

the inner circular wall of the main drill sleeve (5) is evenly provided with a plurality of convex parts (7) corresponding to the pipe clamping grooves (4), and the sleeve pipe assembly is detachably sleeved with the drill bit (1) through nesting fit between the convex parts (7) and the pipe clamping grooves (4).

2. The synchronous follow-up connection structure of the drill bit and the casing in the pipe follow-up drilling construction as claimed in claim 1, wherein: every it all projects slag discharging groove (2) setting to bore claw (3) top to form convex cutting end (31) jointly, diamond compact piece (32) have been laid along the drill bit direction of rotation on cutting end (31).

3. The synchronous follow-up connection structure of the drill bit and the casing in the pipe follow-up drilling construction as claimed in claim 1, wherein: the circumference of the end face of the top end of the main drill bushing (5) is uniformly provided with a plurality of cutting heads (52) matched with the drill bit (1).

4. The synchronous follow-up connection structure of the drill bit and the casing pipe in the follow-up pipe drilling construction as claimed in claim 1, characterized in that: the inner diameter of the sleeve assembly is matched with the outer diameter of the drill bit (1).

5. The synchronous follow-up connection structure of the drill bit and the casing in the pipe follow-up drilling construction as claimed in claim 1, wherein: the top end of the pipe clamping groove (4) is communicated with the end face of the cutting end (31), and the bottom end of the pipe clamping groove vertically extends downwards to a position close to the bottom of the drilling claw (3), so that clamping steps are formed between the groove walls at two sides of the pipe clamping groove (4), the groove wall at the bottom end and the surface of the drilling claw (3); the sleeve assembly is sleeved on the drill bit from the end part of the drill bit along the pipe clamping groove (4).

6. The synchronous follow-up connection structure of the drill bit and the casing pipe in the follow-up pipe drilling construction as claimed in claim 1, characterized in that: the tail end of the auxiliary drill bushing (6) is further connected with a plurality of sections of casings (8) which are butted together, female threaded connectors (62) used for connecting the casings (8) are arranged on the inner circumference of the tail section of the auxiliary drill bushing (6), and the two ends of each section of the casing (8) are respectively provided with a male head and a female head used for threaded butt joint.

7. The synchronous follow-up connection structure of the drill bit and the casing pipe in the follow-up pipe drilling construction as claimed in claim 6, characterized in that: the outer diameter of the sleeve (8) is larger than that of the drill bit (1) and smaller than that of the sleeve assembly.

Images