阅读说明：本技术 微扩孔钻头 (Micro-reaming drill bit ) 是由 刘峻滕 朱辉宝 郑信杰 向永君 林文静 于 2021-08-03 设计创作，主要内容包括：本发明涉及钻头的技术领域,公开了微扩孔钻头,包括连接在钻斗底部的连接头以及活动连接在所述连接头上的活动头,活动头包括插入段以及连接在插入段底部的端头,端头上凸设有钻齿；连接头上设有上下延伸布置且供插入段活动插入的轨槽,插入段自下而上插设在轨槽中；连接头具有朝外布置的外侧壁,当钻头穿过钢套管时,连接头的外侧壁与钢套管之间具有间隙；当插入段朝上移动至极限位置时,端头偏离连接头的外侧壁朝外偏出布置,当插入段朝下移动至极限位置时,端头偏离连接头的外侧壁朝内偏入布置,钻进时,钻头触岩,插入段缩进轨槽朝上移动至极限位置,使端头偏离连接头的外侧壁朝外偏出,端头偏出钢套管口外扩大研磨范围,实现钻头的微扩孔。(The invention relates to the technical field of drill bits, and discloses a micro-reaming drill bit, which comprises a connector connected to the bottom of a drilling bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and an end head connected to the bottom of the insertion section, and drilling teeth are convexly arranged on the end head; the connector is provided with a rail groove which is arranged in an up-and-down extending manner and is used for the insertion section to be movably inserted into, and the insertion section is inserted into the rail groove from bottom to top; the connector is provided with an outer side wall which is arranged outwards, and when the drill bit penetrates through the steel sleeve, a gap is formed between the outer side wall of the connector and the steel sleeve; when the insert section moves up to the extreme position, the lateral wall that the end deviates from the connector arranges that outwards deviate from, when the insert section moves down to the extreme position, the lateral wall that the end deviates from the connector arranges that inwards deviates from, during the drilling, the drill bit touches the rock, insert section indentation rail groove moves up to the extreme position, makes the lateral wall that the end deviates from the connector outwards deviate from, and the end deviates from the steel casing mouth and enlarges the grinding range outward, realizes the micro-reaming of drill bit.)

1. The micro-reaming drill bit is characterized by comprising a connector connected to the bottom of a drilling bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and an end head connected to the bottom of the insertion section, and drilling teeth are arranged on the end head in a protruding mode; the connector is provided with a rail groove which is arranged in an up-and-down extending manner and is used for the insertion section to be movably inserted into, and the insertion section is inserted into the rail groove from bottom to top;

the connector is provided with an outer side wall which is arranged outwards, and when the drill bit penetrates through a steel sleeve, a gap is formed between the outer side wall of the connector and the steel sleeve; when the insertion section moves up to the extreme position, the end head deviates the lateral wall of connector outwards inclines out and arranges, works as when the insertion section moves down to the extreme position, the end head deviates the lateral wall of connector inwards inclines into and arranges.

2. The micro-reamer bit of claim 1, wherein the rail groove is a groove formed in the connecting head, the groove penetrates through the bottom of the connecting head to form a bottom opening, and the insertion section is inserted into the groove from the bottom opening of the groove.

3. The micro-reamer bit of claim 2, wherein the slots and the insertion segments are respectively arranged in an outward arc along the top-down direction of the connecting head, and the insertion segments and the slots are arranged in an arc having the same arc.

4. The micro-reaming drill bit of claim 2, wherein the outer side wall of the connector is provided with a counter bore communicated with the groove, the counter bore is provided with a limiting head, the limiting head is provided with a limiting section penetrating the groove, the insertion section is provided with a limiting side wall arranged outwards, and the limiting side wall is arc-shaped along the direction from top to bottom of the insertion section; the limiting side wall is provided with a limiting groove, the limiting groove extends along the moving direction of the insertion section in the groove strip, and the limiting section is movably arranged in the limiting groove.

5. The micro-reamer bit of any one of claims 1 to 4, wherein the outermost side of the outer side wall of the connector is longitudinally disposed to form a longitudinal wall.

6. The micro-reamer bit of claim 5, wherein the longitudinal wall is inwardly recessed to form the counter bore, the longitudinal side wall having a top side wall and a bottom side wall, the top side wall being disposed opposite the bottom side wall, the top side wall and the bottom side wall being disposed in a co-directional inclined upward direction from the inside to the outside.

7. The micro-reamer bit of any one of claims 1 to 4, wherein the tip has a downwardly and outwardly disposed spherical surface on which the drill teeth are raised.

8. The micro-reamer bit of claim 7, wherein the spherical surface has a rock surface abutment that faces downward against the rock surface and a bore wall abutment that faces outward against the bore wall; when the inserting section moves upwards to the limit position, the rock face abutting part abuts against the rock face from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside; the rock face abutting part and the hole wall abutting part are respectively provided with the drilling teeth in a protruding mode.

9. The micro-reamer bit of claim 8, wherein the spherical surface has a transition abutment portion between the rock surface abutment portion and the bore wall abutment portion, the transition abutment portion being provided with the teeth such that when the insertion section moves upward to the limit position, the teeth on the rock surface abutment portion are inclined downward to abut at the intersection of the bore wall and the rock surface.

10. The micro-reamer bit of any one of claims 1 to 4, wherein a docking platform is provided between the head and the insertion section, the docking platform having a lower docking plane facing upward, the bottom of the connector having an upper docking plane facing downward, the upper docking plane being horizontally disposed; when the inserting section moves upwards to the limit position, the lower butt joint plane is horizontally arranged and is jointed and butted with the upper butt joint plane from bottom to top.

Technical Field

The invention relates to the technical field of drill bits, in particular to a micro-reaming drill bit.

Background

Along with the development of the building industry, the depth of a foundation pit is deeper and deeper, the embedding depth of a supporting structure is also deeper and deeper, and the supporting structure begins to generate rock-socketed requirements.

In the prior art, a common pipe twisting machine is adopted, and can not enter a rock although the verticality is well controlled; if a full-casing full-slewing drilling machine is adopted, the verticality precision is well controlled, but the efficiency is low and the cost is high; at present, rotary drilling and hard occlusion are adopted for entering rocks in many projects, but because no steel sleeve is arranged, the verticality is not well controlled, the precision is not high, and particularly, the verticality is worse in complex strata such as rocks and the like; if the lower steel sleeve of the rotary drilling hydraulic driver is adopted, the efficiency is high, but the lower steel sleeve is difficult to enter the rock and can only reach the earth-rock interface.

Aiming at the project that the steel sleeve can only reach the rock surface and can not continuously drill in the rock stratum, when the rock stratum is drilled, a drill bit needs to drill in advance in the steel sleeve, and in the drilling process, the diameter of a drilling bucket needs to be smaller than the inner diameter of the steel sleeve by 7-15cm in order to enter the steel sleeve, so that the drilling diameter of the drill bit is smaller than the inner diameter of the sleeve, and therefore the drill bit and the steel sleeve with the same diameter up and down can not drill in the rock stratum.

Disclosure of Invention

The invention aims to provide a micro-reaming bit and aims to solve the problem that a bit and a steel sleeve cannot drill in a rock stratum with the same diameter from top to bottom in the prior art.

The micro-reaming drill comprises a connector connected to the bottom of a drill bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and an end head connected to the bottom of the insertion section, and the end head is convexly provided with drill teeth; the connector is provided with a rail groove which is arranged in an up-and-down extending manner and is used for the insertion section to be movably inserted into, and the insertion section is inserted into the rail groove from bottom to top; the connector is provided with an outer side wall which is arranged outwards, and when the drill bit penetrates through the steel sleeve, a gap is formed between the outer side wall of the connector and the steel sleeve; when the insertion section moves up to the extreme position, the end head deviates the lateral wall of connector outwards inclines out and arranges, works as when the insertion section moves down to the extreme position, the end head deviates the lateral wall of connector inwards inclines into and arranges.

Further, the rail groove is formed in a groove strip in the connector, the groove strip penetrates through the bottom of the connector to form a bottom opening, and the insertion section is inserted into the groove strip through the bottom opening of the groove strip.

Further, along connector top-down's direction, the gib block and insertion section arc are arranged outwards respectively, insertion section with the gib block is arranged with the radian arc.

Furthermore, the outer side wall of the connector is provided with a counter bore communicated with the groove strip, a limiting head is arranged in the counter bore, the limiting head is provided with a limiting section penetrating the groove strip, the insertion section is provided with a limiting side wall arranged outwards, and the limiting side wall is arc-shaped along the direction from top to bottom of the insertion section; the limiting side wall is provided with a limiting groove, the limiting groove extends along the moving direction of the insertion section in the groove strip, and the limiting section is movably arranged in the limiting groove.

Furthermore, the outermost side of the outer side wall of the connector is longitudinally arranged to form a longitudinal wall.

Further, the longitudinal wall is recessed inwards to form the counter bore, the longitudinal side wall is provided with a top side wall and a bottom side wall, the top side wall and the bottom side wall are arranged oppositely, and the top side wall and the bottom side wall are obliquely arranged upwards in the same direction along the direction from inside to outside.

Further, the end head is provided with a spherical surface which is arranged downwards and outwards, and the drill teeth are convexly arranged on the spherical surface.

Further, the spherical surface is provided with a rock surface abutting part which abuts against the rock surface downwards and a hole wall abutting part which abuts against the hole wall outwards; when the inserting section moves upwards to the limit position, the rock face abutting part abuts against the rock face from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside; the rock face abutting part and the hole wall abutting part are respectively provided with the drilling teeth in a protruding mode.

Further, spherical face has the transition butt portion that is located between rock face butt portion and the pore wall butt portion, the protruding being equipped with of transition butt portion the brill tooth, work as when the insertion section moves up to extreme position, the brill tooth on the rock face butt portion slope butt downwards in the handing-over department of pore wall and rock face.

Furthermore, a butt joint platform is arranged between the end head and the insertion section, the butt joint platform is provided with a lower butt joint plane which is arranged upwards, the bottom of the connector is provided with an upper butt joint plane which is arranged downwards, and the upper butt joint plane is arranged horizontally; when the inserting section moves upwards to the limit position, the lower butt joint plane is horizontally arranged and is jointed and butted with the upper butt joint plane from bottom to top.

Compared with the prior art, when the micro-reaming drill bit is used, the movable head of the drill bit in a free state sags under the action of gravity, the insertion section moves downwards to the limit position, the movable head contracts inwards, so that a gap is formed between the outer side wall of the connector and the steel sleeve, and a drilling bucket can penetrate through the steel sleeve; when the drill bit touches a rock, the inserting section indentation rail groove moves upwards to a limit position, so that the end head deviates from the outer side wall of the connector and outwards deviates out, the end head deviates out of the steel sleeve opening to expand the grinding range, and micro-reaming of the drill bit is realized.

Drawings

FIG. 1 is a general schematic view of a micro-reamer bit provided by the present invention;

FIG. 2 is a general schematic view of a micro-reamer bit provided by the present invention;

fig. 3 is a schematic view of a movable head of the micro-reamer bit of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-3, preferred embodiments of the present invention are shown.

The micro-reaming drill comprises a connector 108 connected to the bottom of a drilling bucket and a movable head 100 movably connected to the connector 108, wherein the movable head 100 comprises an insertion section 105 and an end head 107 connected to the bottom of the insertion section 105, and drilling teeth 101 are convexly arranged on the end head 107; the connector 108 is provided with a rail groove which is arranged in an up-and-down extending manner and is used for the insertion section 105 to be movably inserted into, and the insertion section 105 is inserted into the rail groove from bottom to top;

the connector 108 has an outwardly disposed outer sidewall, with a gap between the outer sidewall of the connector 108 and the steel casing when the drill bit passes through the steel casing; when the insertion section 105 is moved upward to the limit position, the tip 107 is biased outwardly away from the outer side wall of the connection head 108, and when the insertion section 105 is moved downward to the limit position, the tip 107 is biased inwardly into the outer side wall of the connection head 108.

When the micro-reaming drill bit is used, the movable head 100 of the drill bit in a free state sags under the action of gravity, the insertion section 105 moves downwards to the limit position, the movable head 100 contracts inwards, so that a gap is formed between the outer side wall of the connector 108 and a steel casing, and a drilling bucket can penetrate through the steel casing; when the drill bit touches a rock, the inserting section 105 retracts into the rail groove and moves upwards to the limit position, so that the end head 107 deviates from the outer side wall of the connector 108 and deviates outwards, the grinding range is expanded, and micro-reaming of the drill bit is realized.

The track groove is a groove 106 formed in the connecting head 108, the groove 106 penetrates through the bottom of the connecting head 108 to form a bottom opening, the inserting section 105 is inserted into the groove 106 from the bottom opening of the groove 106 and moves up and down in the groove 106, and the position state of the movable head 100 on the inserting section 105 is changed.

Further, along the direction of the connector 108 from top to bottom, the groove strips 106 and the insertion sections 105 are respectively arranged in an outward arc shape with the same radian, and the groove strips 106 arranged in the arc shape are matched with the insertion sections 105 to enable the end heads 107 to deviate from the outer side walls of the connector 108 and outwards deviate from the pipe walls of the steel sleeve, so that micro-reaming relative to the steel sleeve is realized.

The outer side wall of the connecting head 108 is provided with a counter bore 109 communicated with the groove 106, a limiting head 110 is arranged in the counter bore 109, the limiting head 110 is provided with a limiting section which penetrates through the counter bore 109 and is arranged in the groove 106, the limiting head 110 is inserted into the counter bore 109 to limit the insertion section 105 to move in the limiting section in the groove 106, the insertion section 105 is provided with a limiting side wall 113 which is arranged outwards and is along the direction from top to bottom of the insertion section 105, the limiting side wall 113 is arc-shaped and has the same radian with the groove 106, and the insertion section 105 can be ensured to move freely in the groove 106;

the limiting side wall 113 is provided with a limiting groove 104, and the limiting groove 104 extends along the moving direction of the insertion section 105 in the groove 106, and the movement of the limiting section is limited in the limiting groove 104, so that the insertion section 105 of the drill bit is limited to move in the limiting groove 104.

The outermost side of the outer side wall of the connector 108 is longitudinally arranged to form a longitudinal wall, the longitudinal wall is recessed inwards to form a counter bore 109 for inserting the limiting head 110, the limiting head 110 is used for limiting the insertion section in the limiting groove 104, the movable head 100 is prevented from falling out of the connector 108, the longitudinal side wall is provided with a top side wall 111 and a bottom side wall 112, the top side wall 111 and the bottom side wall 112 are oppositely arranged, the top side wall 111 and the bottom side wall 112 are obliquely arranged upwards in the same direction along the direction from inside to outside, a protective shell is formed in the groove strip 106, and the insertion section 105 is protected from normally moving in the groove strip 106.

Specifically, the head 107 of the movable head 100 has a spherical surface 102 facing downward and outward, the drill teeth 101 are convexly arranged on the spherical surface 102, and the spherical surface 102 has a wider contact surface with the rock surface, so that the contact surface with the rock surface is convenient for grinding the peripheral rock. Spherical surface 102 has a rock surface abutting portion which abuts against the rock surface downwards and a hole wall abutting portion which abuts against the hole wall outwards, and drilling and grinding are conveniently carried out through the abutting portion, the rock surface and the hole wall in contact.

When the insertion section 105 moves upwards to the limit position, the rock face abutting part abuts against the rock face from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside to form grinding of the peripheral hole wall and the rock face at the bottom; the rock face abutting part and the hole wall abutting part are respectively provided with the drill teeth 101 in a protruding mode, and the drill teeth 101 are beneficial to improving drilling efficiency and drilling hard rocks.

The spherical surface 102 is provided with a transition abutting part between the rock surface abutting part and the hole wall abutting part, the transition abutting part is convexly provided with drill teeth 101, when the insertion section 105 moves upwards to the limit position, the drill teeth 101 on the rock surface abutting part are obliquely abutted on the joint of the hole wall and the rock surface downwards, and when drilling, the drill teeth 101 on the spherical surface 102 are fully contacted with surrounding rocks.

A butt joint platform 103 is arranged between the end 107 and the insertion section 105 on the movable head 100, the butt joint platform 103 is provided with a lower butt joint plane which is arranged upwards, the bottom of the connector 108 is provided with an upper butt joint plane which is arranged downwards, the upper butt joint plane is arranged horizontally, and the butt joint platform 103 has the functions of increasing the stress area of the movable head 100 and reinforcing the movable head 100; when the insertion section 105 moves upwards to the limit position, the lower butt-joint plane is horizontally arranged and is in butt joint with the upper butt-joint plane from bottom to top, so that the movable head 100 and the connector 108 are uniformly stressed at the butt-joint plane 103.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.