CN211115793U

CN211115793U - Eccentric drilling tool

Info

Publication number: CN211115793U
Application number: CN201922403169.2U
Authority: CN
Inventors: 杨日平; 陈真; 杨湘龙
Original assignee: Changsha Heijingang Industrial Co Ltd
Current assignee: Changsha Heijingang Industrial Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-28
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses an eccentric drilling tool, including drill bit, eccentric reaming cover and stabilizer, the drill bit front portion is head, rear portion for connecting rod portion, middle part be eccentric neck rod portion, the eccentric borehole jack of eccentric reaming cover is established on the eccentric neck rod portion and between normal running fit, connecting rod portion includes that the periphery has connecting thread's screw thread post section, the front portion of stabilizer has the cover to be established the connecting hole in the connecting rod portion outside, just have in the connecting hole with screw thread post section threaded connection's screw thread hole section, connecting rod portion is in screw thread post section rear side has the location cylinder section, the connecting hole is in screw thread hole section rear side have with location cylinder section complex location circle hole section. Set up matched with location circle hole section and location circle post section in screw thread post section rear side, because location cylinder section and location decide between the circle hole section compressive capacity strong, so non-deformable, greatly increased this eccentric drilling tool's life.

Description

Eccentric drilling tool

Technical Field

The utility model relates to a tool instrument technical field, more specifically say, relate to an eccentric drilling tool.

Background

The percussion drill bit is widely applied to early-stage rock sample detection of a series of engineering projects such as ore detection, underground rock sample collection, constructional engineering, hydropower, ports, highways, urban construction projects and the like, and meanwhile, dust is collected, so that environmental pollution is avoided, and the percussion drill bit has a good environment-friendly effect. The drill bit is composed of a drill bit body and alloy teeth, stress waves of impact striking transmitted by the impactor or the power head are transmitted to the alloy teeth through the drill bit body, and the alloy teeth break rock to break rock.

There is an eccentric drilling tool among the percussion bit, this eccentric drilling tool mainly includes drill bit, eccentric reaming cover and the steady pole ware of being connected with the drill bit, and wherein the drill bit anterior segment is head, back end for connecting rod portion, middle part be eccentric neck rod portion, and the eccentric borehole jack of eccentric reaming cover is established on eccentric neck rod portion and between normal running fit, and wherein the anterior mounting hole cover of steady pole ware is established in the connecting rod portion outside, threaded connection between and. Wherein the head mainly used drilling of drill bit, and wherein eccentric reaming cover is then at the drill bit drilling basis on further reaming, and then form with pipeline complex hole, at the in-process of drilling, pack into the pipeline in the hole simultaneously, wherein the drill bit diameter is less than the pipeline internal diameter, and eccentric reaming cover can carry out reaming work under eccentric state, and at the withdrawal state, can reduce eccentric degree, present the state of drawing close to the middle part promptly to make eccentric reaming cover all follow the pipeline lumen with the drill bit and shift out.

In the process of drilling by the eccentric drilling tool, the eccentric drilling tool rotates and impacts up and down simultaneously, and the thread is subjected to unbalance loading along the radial direction at the threaded connection position of the drill bit and the rod stabilizer, so that the thread is broken.

In summary, how to effectively solve the problem that the threaded connection teeth between the drill bit of the eccentric drilling tool and the rod stabilizer are easily damaged is a problem which needs to be solved by the technical personnel in the field at present.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an eccentric drilling tool, which can effectively solve the problem that the thread connection teeth between the drill bit and the rod stabilizer of the existing eccentric drilling tool are easily damaged.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an eccentric drilling tool, includes drill bit, eccentric reaming cover and stabilizer, the drill bit front portion is head, rear portion for connecting rod portion, middle part be eccentric neck rod portion, eccentric borehole jack of eccentric reaming cover is established on the eccentric neck rod portion and between normal running fit, connecting rod portion includes that the periphery has connecting thread's screw thread post section, the front portion of stabilizer has the cover to be established the connecting hole in the connecting rod portion outside, just have in the connecting hole with screw thread post section threaded connection's screw thread hole section, connecting rod portion is in screw thread post section rear side has the location cylinder section, the connecting hole is in screw thread hole section rear side have with location cylinder section complex location circle hole section.

In this eccentric drilling tool, when using, because eccentric reaming cover during operation eccentric settings, so during operation, eccentric reaming cover one side atress, according to the mechanics principle, lever theory promptly, connecting hole is along being close to one side of eccentric reaming cover atress this moment, eccentric side promptly, receive the fulcrum power, and connecting rod portion rear portion tip keeps away from the extrusion force between one side of eccentric reaming cover atress and the connecting hole wall, because connecting rod portion is provided with the location cylinder section in screw post section rear side, so receive great extrusion force between location cylinder section and the location circle hole section this moment, so the extrusion force between screw post section and the screw hole section has been reduced. Therefore, in the eccentric drilling tool, the rear side of the threaded column section is provided with the matched positioning circular hole section and the positioning circular column section, so that the thread stress at the threaded column section is effectively avoided, the thread at the position is effectively protected, and the later-stage disassembly and assembly are convenient. And because the compression resistance between the positioning cylindrical section and the positioning circular hole section is strong, the eccentric drilling tool is not easy to deform, and the service life of the eccentric drilling tool is greatly prolonged. In conclusion, the eccentric drilling tool can effectively solve the problem that the threaded connection teeth between the drill bit and the rod stabilizer of the existing eccentric drilling tool are easy to damage.

Preferably, the connecting hole is provided with a flared hole section between the threaded hole section and the positioning circular hole section, the diameter of the flared hole section is continuously gradually reduced from front to back, and the rear part of the flared hole section and the front part of the positioning circular hole section are in smooth transition.

Preferably, the connecting hole is a cylindrical hole at the front side of the threaded hole section, and the connecting rod part is a cylindrical part matched with the cylindrical hole at the front side of the threaded column section.

Preferably, the front section of the connecting hole is the cylindrical hole, the front hole edge of the cylindrical hole is in a shape of an inverted fillet, a limiting shoulder is arranged on one side, close to the eccentricity of the eccentric neck rod part, of the front part of the connecting rod part, a round angle is formed between the limiting shoulder and the cylindrical part, and the limiting shoulder abuts against the front end face of the rod stabilizer.

Preferably, one end of the eccentric reaming sleeve abuts against the head, the other end of the eccentric reaming sleeve abuts against the end of the rod stabilizer, and an eccentric lock is arranged between the eccentric reaming sleeve and the drill bit to prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates towards a preset direction relative to the drill bit to an eccentric state, and prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates towards a preset direction relative to the drill bit to a coaxial state.

Preferably, the inside shaft hole that link up around being provided with of stabilizer bar, the inside rear side of drill bit be provided with the blind hole that the shaft hole aligns the setting and communicates, a plurality of diffluence holes that are scattered the setting and extend to the head drilling surface are seted up to the blind hole bottom, the drilling surface correspondence of head be provided with the diffluence hole intercommunication just leads to the cell body of side.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural view of an eccentric drilling tool according to an embodiment of the present invention;

fig. 2 is a schematic view of the thread engagement between the threaded hole section and the threaded post section provided by the embodiment of the present invention.

The drawings are numbered as follows:

the device comprises a head part 1, a threaded column section 2, a positioning cylindrical section 3, a cylindrical part 4, a threaded hole section 5, a positioning cylindrical hole section 6, a cylindrical hole 7, an eccentric reaming sleeve 8, a locking pin 9 and an eccentric neck rod part 10.

Detailed Description

The embodiment of the utility model discloses eccentric drilling tool to solve the problem that threaded connection tooth damaged easily between present eccentric drilling tool drill bit and the stabilizer bar ware effectively.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, fig. 1 is a schematic cross-sectional view of an eccentric drilling tool according to an embodiment of the present invention; fig. 2 is a schematic view of the thread engagement between the threaded hole section and the threaded post section provided by the embodiment of the present invention.

In one embodiment, the present embodiment provides an eccentric drilling tool, in particular comprising a drill bit, an eccentric reamer sleeve 8 and a stabilizer.

Wherein the drill bit front portion is head 1, the rear portion is connecting rod portion, the middle part is eccentric neck pole portion 10, wherein the steady pole ware front portion has the connecting hole of cover establishing in the connecting rod portion outside, and the rear portion is the pole portion, and the axis of this pole portion is the axis of rotation of eccentric drilling tool, and wherein the axis of self of head 1 and this axis of rotation are located same straight line.

The eccentric neck rod part 10 is a cylindrical rod part, and the axis of the rod part is not in the same line with the rotation axis, i.e. the axis of the eccentric neck rod part is arranged eccentrically relative to the rotation axis. Wherein eccentric borehole jack of eccentric reaming cover 8 is established on eccentric neck pole portion 10, normal running fit between and, the hole diameter of eccentric borehole equals with the outer diameter of eccentric neck pole portion 10 promptly, so that eccentric reaming cover 8 can rotate to eccentric state, and when eccentric state, the torque transmission of drill bit or steady pole ware is to eccentric reaming cover 8 department, so that eccentric reaming cover 8 can realize the reaming operation on the basis of drill bit drilling, and rotate when withdrawing the state, make eccentric side no longer the protrusion set up, in order to break away from out in can following the pipeline lumen. Specifically, wherein eccentric reaming cover 8 is whole cylindricly, and outside cylinder side axis sets up with the axis off-centre of eccentric orfice, and preferably when changeing back to the shrink state, the axis and the above-mentioned axis of rotation of the outside cylinder side of eccentric reaming cover 8, the straight line of drill bit axis place promptly is located same straight line.

Wherein the connecting hole is connected with connecting rod portion, and specific connecting rod portion includes that the periphery has connecting thread's screw thread column section 2, and is corresponding, has in the connecting hole with 2 threaded connection's of screw thread column section screw thread hole section 5 to realize threaded connection through screw thread hole section 5 and screw thread column section 2, accomplish fixed connection promptly. It should be noted that in order to ensure that the connecting rod can be inserted into the connecting hole and complete the threaded connection, the portion of the connecting rod behind the threaded post section 2 should be able to pass through the threaded hole section 5.

Wherein the connecting rod part is provided with a positioning cylindrical section 3 at the rear side of the threaded cylindrical section 2, wherein the positioning cylindrical section 3 and the threaded cylindrical section 2 can be continuously connected, and other structures can also be arranged between the positioning cylindrical section 3 and the threaded cylindrical section 2. Wherein the connecting hole has the location circle hole section 6 with location circle post section 3 complex at the 5 rear sides of screw hole section to accomplish threaded connection back at screw thread post section 2 and screw hole section 5, wherein location circle post section 3 inserts to location circle hole section 6 in, both closely cooperate, play the effect of location axis. Wherein, clearance fit can be formed between the positioning cylindrical section 3 and the positioning circular hole section 6, and the smaller the clearance error is, the better the clearance error is.

In this eccentric drilling tool, when using, because eccentric reaming cover 8 during operation eccentric settings, so during operation, 8 one side atress of eccentric reaming cover, according to the mechanics principle, lever theory promptly, connecting hole edge is close to the one side of 8 atress of eccentric reaming cover this moment, eccentric side promptly, receive the fulcrum power, and connecting rod portion rear portion tip keeps away from between one side of 8 atress of eccentric reaming cover and the connecting hole wall extrusion force, because connecting rod portion is provided with location cylinder section 3 at 2 rear sides of threaded column section, so receive great extrusion force between location cylinder section 3 and location cylinder section 6 this moment, so the extrusion force between threaded column section 2 and threaded hole section 5 has been reduced. So in this eccentric drilling tool, because set up matched with location hole section 6 and location cylinder section 3 in 2 rear sides of screw thread column section, so avoided 2 department screw threads atress of screw thread column section effectively, and then protected this department screw thread effectively for later stage easy dismounting. And because the compression resistance between the positioning cylindrical section 3 and the positioning circular hole section 6 is strong, the eccentric drilling tool is not easy to deform, and the service life of the eccentric drilling tool is greatly prolonged. In conclusion, the eccentric drilling tool can effectively solve the problem that the threaded connection teeth between the drill bit and the rod stabilizer of the existing eccentric drilling tool are easy to damage.

Further, when the threaded cylindrical section is screwed into the threaded hole section 5, the positioning cylindrical section 3 firstly passes through the threaded hole section 5 and then enters the positioning cylindrical hole section 6. Because closely cooperate between location circular hole section 6 and the location circular column section 3, and have the clearance between screw thread post section 2 and the screw thread hole section 5, lead to both axes to have the skew easily, so location circular column section 3 is difficult accurate to enter into location circular hole section 6, leads to the installation difficulty. Based on this, it is preferable here that the connection hole has a flared section with a continuously tapered aperture from front to back between the threaded hole section 5 and the positioning circular hole section 6, and the flared section back and the positioning circular hole section 6 front transition smoothly, so that the flared section functions as a guide. So that at the precession in-process, wherein during location cylinder section 3 enters into the bell mouth section first, be led to in order to guarantee the centering by the bell mouth section, then enter into location cylinder section 3 gradually again for simple to operate is simple.

Further, in order to fully position the drill bit and the rod stabilizer, the connecting hole is preferably a cylindrical hole 7 at the front side of the threaded hole section 5, and correspondingly, the connecting rod part is a cylindrical part 4 matched with the cylindrical hole 7 at the front side of the threaded cylindrical section 2, wherein the cylindrical hole 7 is preferably in clearance fit with the cylindrical part 4, and the matching precision is preferably equal to that between the positioning cylindrical section 3 and the positioning cylindrical hole section 6. For better fixing the drill bit and the shank stabilizer, it is preferable that a locking pin 9 is arranged between the cylindrical hole 7 and the cylindrical portion 4, and one half of the locking pin 9 is positioned in a groove matched with the hole wall of the cylindrical hole 7, and the other half is positioned in a groove matched with the outer side surface of the cylindrical portion 4. Wherein the locking pin 9 is generally circular in cross-section and the cylindrical bore 7 and the corresponding recess in the cylindrical portion 4 are both semi-circular.

Further, the preferred connecting hole anterior segment of here is cylinder hole 7, and the anterior hole edge of cylinder hole 7 is radius angle type, because the effect that plays the fulcrum here, adopts radius angle type, can guarantee effectively to support intensity, and then guarantees whole life. Also, in order to ensure the strength of the drill, it is preferable that the front portion of the connection rod portion has a position-limiting shoulder on the side close to the eccentricity of the eccentric sleeve, wherein the position-limiting shoulder is rounded off from the cylindrical portion 4, so as to effectively prevent the drill from being easily broken. And the limiting shoulder is abutted against the front end face of the rod stabilizer to ensure that a part of extrusion force can be borne between the limiting shoulder and the rod stabilizer, so that the excessive pressure at the rear part of the connecting rod part is avoided.

Wherein eccentric neck pole portion 10 is located between head 1 and the connecting rod portion, and both ends link up with head 1 and connecting rod portion respectively, and wherein the rear portion terminal surface of eccentric neck pole portion 10 forms above-mentioned spacing shoulder, and in order to guarantee overall structure's intensity, preferred wherein the one end of eccentric reaming cover 8 offsets with head 1, the other end offsets with the tip of steady pole ware.

Wherein the eccentric reamer 8 is rotated on the eccentric neck shank 10 to switch between an eccentric state and a retracted state, wherein the driving of the eccentric reamer 8 in relation to the eccentric neck shank 10 can be driven by an external mechanism, but such a driving would result in a more complex overall structure, based on which it is preferred that a rotational lock is provided between the eccentric reamer 8 and the drill bit to prevent the eccentric reamer 8 from continuing to rotate when the eccentric reamer 8 rotates in relation to said drill bit in a predetermined direction to an eccentric state and to prevent the eccentric reamer 8 from continuing to rotate when the eccentric reamer 8 rotates in relation to the drill bit in the opposite direction to the predetermined direction to the retracted state. When current eccentric reaming cover 8 rotates to the withdrawal state relative to eccentric neck pole portion 10, steady pole ware at this moment drives the antiport of drill bit towards the predetermined direction, eccentric reaming cover 8 is under the frictional force effect of pore wall this moment, and for the pore wall keeps motionless, even make eccentric reaming cover 8 rotate towards the predetermined direction for eccentric neck pole portion, until entering into eccentric state, and rotate this moment the locking make eccentric reaming cover 8 with eccentric neck pole portion 10 keeps relatively fixed to through rotating the locking, transmit drive torque to eccentric reaming cover 8, and then drive eccentric reaming cover 8 and rotate, in order to realize the reaming operation. When the drill bit rotates towards the preset direction, under the action of the friction force of the pore canal wall, the eccentric reaming sleeve 8 reversely rotates to the retraction state, and the eccentric reaming sleeve 8 is stopped in the retraction state through the rotation locking. Wherein the rotation locking is generally including protruding and the arc recess of mutually supporting, and the arch slides in the arc recess to block spacingly by the both ends cell wall of arc recess, if be provided with radial arch on eccentric reaming cover 8, and eccentric neck pole portion 10 is provided with the arc recess, when eccentric reaming cover rotates relative eccentric neck pole portion, radial arch slides in the arc recess.

Wherein, for better chip removal to and convenient cooling, the inside shaft hole that link up around being provided with of the preferred stabilizer of here, the inside rear side of drill bit is provided with the blind hole that aligns with the shaft hole and set up and communicate, and the blind hole bottom is seted up a plurality of diffluence holes that are scattered the setting and extend to 1 drill face of head, and the drill face of head 1 corresponds to be provided with the diffluence hole intercommunication and lead to the cell body of side.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an eccentric drilling tool, includes drill bit, eccentric reaming cover and stabilizer, the drill bit anterior segment is head, back end for connecting rod portion, middle part be eccentric neck rod portion, eccentric borehole jack of eccentric reaming cover is established on the eccentric neck rod portion and between normal running fit, connecting rod portion includes that the periphery has connecting thread's screw thread post section, stabilizer's front portion has the cover to be established the connecting hole in the connecting rod portion outside, just have in the connecting hole with screw thread post section threaded connection's screw thread hole section, a serial communication port, connecting rod portion is in screw thread post section rear side has the location cylinder section, the connecting hole is in screw thread hole section rear side have with location cylinder section complex location circle hole section.

2. The eccentric drilling tool according to claim 1, wherein the connecting hole has a flared section with a continuously tapered bore diameter from front to back between the threaded bore section and the locating circular bore section, and the flared section rear portion and the locating circular bore section front portion are in smooth transition.

3. The eccentric drilling tool according to claim 2, wherein the connection hole is a cylindrical hole at a front side of the threaded hole section, and a portion of the connection rod part at the front side of the threaded cylindrical section is a cylindrical part engaged with the cylindrical hole.

4. The eccentric drilling tool according to claim 3, wherein the front section of the connecting hole is the cylindrical hole, the front hole edge of the cylindrical hole is in a rounded corner shape, a limiting shoulder is arranged on one side, close to the eccentricity of the eccentric neck rod part, of the front part of the connecting rod part, a round corner is arranged between the limiting shoulder and the cylindrical part, and the limiting shoulder abuts against the front end face of the rod stabilizer.

5. The eccentric drilling tool according to claim 4, wherein one end of the eccentric reaming sleeve abuts against the head, the other end of the eccentric reaming sleeve abuts against the end of the rod stabilizer, and a rotation lock is arranged between the eccentric reaming sleeve and the drill bit to prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates to an eccentric state relative to the drill bit in a predetermined direction and to prevent the eccentric reaming sleeve from continuing to rotate when the eccentric reaming sleeve rotates to a retracted state relative to the drill bit in a reverse direction in the predetermined direction.

6. The eccentric drilling tool according to claim 5, wherein a shaft hole is formed in the stabilizer and penetrates through the stabilizer from front to back, a blind hole is formed in the rear side of the interior of the drill bit and is aligned with and communicated with the shaft hole, a plurality of flow distribution holes are formed in the bottom of the blind hole and are distributed in a scattered mode and extend to the drill face of the head, and a groove body which is communicated with the flow distribution holes and leads to the side edge is correspondingly formed in the drill face of the head.