CN109707323B - Connecting structure for drill bit and drill rod - Google Patents
Connecting structure for drill bit and drill rod Download PDFInfo
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- CN109707323B CN109707323B CN201910025510.7A CN201910025510A CN109707323B CN 109707323 B CN109707323 B CN 109707323B CN 201910025510 A CN201910025510 A CN 201910025510A CN 109707323 B CN109707323 B CN 109707323B
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Abstract
The invention discloses a connecting structure for a drill bit and the drill bit, which comprises a drill bit and the drill bit, wherein a blind hole is arranged in the middle of the end surface of a handle part of the drill bit, a threaded hole is formed at the bottom of the blind hole, an annular groove is formed in the inner circumferential wall of the blind hole, two arc-shaped grooves are also formed in the end surface of the handle part, an outer sleeve is sleeved on the outer wall of the drill bit, two movable blocks are respectively arranged on two sides of the lower end surface of the outer sleeve, two fixed blocks are arranged on the outer circumferential wall of the drill bit, an internal thread is arranged on the inner circumferential wall of the upper end of the outer sleeve, an external thread is arranged on the outer circumferential wall of. On the premise of ensuring the connection stability of the drill bit and the drill rod, when the drill bit bounces due to the fact that the drill bit meets a stratum with uneven lithology, the two fixed blocks and the two movable blocks are located on the same circumference through the rotation of the outer sleeve, a second anti-falling structure is formed in the annular groove, and therefore the probability of falling of the drill bit is reduced.
Description
Technical Field
The invention relates to the technical field of construction equipment for basic engineering drilling, petroleum engineering drilling and the like, in particular to a connecting structure for a drill bit and a drill rod.
Background
With the continuous acceleration of the modernization process, a large number of large-scale projects such as super high-rise buildings, large-span bridges and the like are continuously emerged, and the pile foundations supporting the huge objects are the most important foundation. The drilling machine is applied to the construction of large-caliber ultra-deep pile foundations of large-scale buildings on land, complex strata such as hard rock stratums, port and wharf pile foundations, the construction of embankment protection piles and the construction of bridge pile foundations in rivers, lakes and sea. When the drilling machine operates, a drill bit is utilized to drill into a cylindrical round hole in a designated area, namely drilling is carried out; the diameter of the borehole for drilling oil and gas and ground water is relatively large, and the diameter and depth of the borehole depend on the depth of the geological mineral deposit and the use of the borehole. The drill bit is an integral part of the drilling apparatus and its main function is to break up rock and form the borehole. The rotary drill bit is a drill bit commonly used in the petroleum industry, and the drill bit generates centripetal motion under the driving of mechanical power, and cracks and breaks rocks through cutting and grinding so as to achieve the aim of downward drilling. In actual use, the drill bit with the proper specification and shape is scientifically and reasonably selected according to different working environments and geological conditions.
A drill pipe is a steel pipe with threading on its end for connecting surface equipment of a drilling machine to drilling and grinding equipment or a bottom hole device at the bottom end of a drilled well, and is used for conveying drilling mud to a drill bit and raising, lowering or rotating the bottom hole device together with the drill bit. The drill pipe must be able to withstand large internal and external pressures, twisting, bending and vibration. The drill rods are divided into a kelly bar, a drill rod and a weighted drill rod, and the connection sequence is 1 kelly bar, n drill rods and n weighted drill rods, wherein the kelly bar, the drill rod and the weighted drill rods are determined by the well depth and the design of a drilling tool assembly. When the drilling machine operates, the drill bit is connected with the drill rod matched with the drill bit in a threaded manner, and the drill bit is lifted and lowered by continuously increasing and decreasing the number of the drill rods; however, when the drill bit rotating at a high speed encounters a stratum with uneven lithology, bouncing phenomenon is caused, so that huge additional vibration load and shearing stress are generated, and the screw thread between the handle part of the drill bit and the drill rod is easy to lose efficacy or the screw is loosened, so that the drill bit is separated from the drill rod and falls off. The dropped drill bit is expensive and is very easy to induce engineering accidents such as hole plugging, and special fishing equipment is needed to be used for fishing and cleaning, so that the drilling construction period is greatly delayed, and huge manpower, material resources and financial resources are consumed.
Disclosure of Invention
The invention aims to provide a connecting structure for a drill bit and a drill rod, which ensures firm connection between the drill bit and the drill rod and effectively reduces the probability of falling of the drill bit in the operation process of a drilling machine.
The invention is realized by the following technical scheme:
a connecting structure for a drill bit and a drill rod comprises the drill rod and the drill bit, wherein a blind hole is arranged in the middle of the end face of a handle part of the drill bit, a threaded hole matched with the drill rod in a threaded mode is formed in the bottom of the blind hole, the blind hole is coaxial with the threaded hole, an annular groove is formed in the inner circumferential wall of the blind hole, two arc-shaped grooves communicated with the annular groove are further formed in the end face of the handle part, an outer sleeve is sleeved on the outer wall of the drill rod, two movable blocks are respectively arranged on two sides of the lower end face of the outer sleeve, two fixed blocks are symmetrically arranged on the outer circumferential wall of the drill rod along the axis, the two movable blocks and the two fixed blocks are in inferior arc shapes, the arc length corresponding to the movable blocks is smaller than the arc length corresponding to the fixed blocks, internal threads are arranged on the inner circumferential wall of the upper end of, the rotating direction of the external thread is opposite to that of the threaded hole; when the drill rod is used, the outer sleeve is rotated until the movable blocks and the fixed blocks are in a superposed state, the superposed state means that the two movable blocks are respectively located at the upper ends of the two fixed blocks, the outer sleeve is moved downwards along the axis of the drill rod until the movable blocks and the fixed blocks enter the annular groove along the arc-shaped groove, the outer sleeve is rotated again, so that the external threads on the outer wall of the drill rod are matched with the internal threads, and the movable blocks and the fixed blocks are changed from the superposed state to different point positions respectively located on the circumference where.
In the prior art, when a stratum with uneven lithology is encountered in drilling construction, a drill bit rotating at a high speed is blocked, and in severe cases, the drill bit can generate non-directional bouncing, so that additional vibration load and shear stress are generated, the drill bit and a drill rod are generally connected through screw fastening or screw thread matching, the huge additional load can cause the screw between the drill bit and the drill rod to be loosened or the screw thread matching to fail, namely, the situation of drill sticking or even drill dropping can occur, the manufacturing cost of the drill bit for drilling is quite high, the fishing process of the drill bit is carried out, particularly when the drilling depth is quite large, the fishing difficulty is very high, a large amount of manpower and material resources are consumed, and the drilling period can be prolonged; in contrast, the applicant designs a special connection structure for the drill bit and the drill rod, and on the premise of ensuring firm connection between the drill bit and the drill rod, when the drill bit bounces due to the fact that the drill bit meets a lithologic non-uniform stratum, the two fixed blocks and the two movable blocks are located on the same circumference by rotating the outer sleeve, a second anti-falling structure is formed in the annular groove, and therefore the probability that the drill bit falls is reduced.
In an initial state, the outer sleeve is sleeved on the outer circumferential wall of the drill rod, and the internal thread is not matched with the external thread; when the drill bit is used, the outer sleeve is rotated to enable the two movable blocks to be respectively positioned at the upper ends of the two fixed blocks, namely the movable blocks and the fixed blocks are in an overlapped state, the lower end of the drill rod enters the handle part of the drill bit along the blind hole, the movable blocks and the fixed blocks move downwards along the arc-shaped groove along the lower end of the drill rod, until the movable blocks and the fixed blocks completely enter the annular groove, after the lower end of the drill rod is completely matched with the threaded hole, the outer sleeve is rotated again to enable the movable blocks and the fixed blocks to be changed into a state of the same circumference from the overlapped state, namely the two movable blocks and the two fixed blocks are respectively positioned on different positions of the circumference of the arc-shaped groove, at the moment, the arc length of the fixed blocks and the arc length of the arc-shaped groove are not on the same vertical plane, the drill rod and the outer sleeve are matched through, screw thread inefficacy between drill bit and the drilling rod and then lead to being connected between drill bit and the drilling rod inefficacy, at this moment, two movable blocks that lie in on same circumference orbit and two fixed blocks are along with the drill rod and continuously take place circular motion, and only there are two arcs as the opening at the stalk portion up end, arbitrary one in two movable blocks and two fixed blocks all can't upwards shift out through the opening, can ensure to be in effectual connected state between drilling rod and the stalk portion all the time, and then effectively avoid the occurence of failure that the drill bit breaks away from the drilling rod, operating personnel only need promote a plurality of drilling rods, then the installation flow of reverse operation drill bit and drilling rod, can carry out quick replacement to the drill bit, subsequent salvage process has effectively been avo. It should be noted that when the drill bit encounters a formation with non-uniform lithology, the bit may be rotated in the opposite direction, the drill rod and the outer sleeve form a whole after being matched by threads, the drill rod keeps circular motion continuously, after the drill bit rotates reversely, the threaded hole is matched with the threads at the lower end of the drill rod to lose efficacy, the drill bit moves downwards for a certain distance, so that the two movable blocks or the fixed block can be directly contacted with the upper wall of the arc-shaped groove, the friction between the two can drive the movable block to rotate along the same direction of the drill bit, and because the rotating direction of the external thread is opposite to that of the threaded hole, that is, the reverse rotation of the drill bit can only drive the outer sleeve to move downwards along the axis of the outer sleeve, no interference is generated on the connection stability between the outer sleeve and the drill rod, and finally the two movable blocks and the fixed block are ensured to be kept in a state of one circumference at the same position, so that the stability of the second anti-falling structure is improved.
Preferably, the two movable blocks and the two fixed blocks are in a minor arc shape, the arc length corresponding to the movable blocks is smaller than that corresponding to the fixed blocks, the arranged arc-shaped grooves are used for the movable blocks and the fixed blocks to pass through, namely, the arc length corresponding to the arc-shaped grooves is larger than that corresponding to the fixed blocks, the arc-shaped grooves are arranged in the minor arc shape, so that the arcs where the two arc-shaped grooves are located are removed from the circumference where the arc-shaped grooves are located, the rest circumference part occupies more than one half of a unit circle, and after the movable blocks and the fixed blocks enter the annular groove, a space for limiting the movable blocks or the fixed blocks to move in the vertical direction is formed in the annular groove and is large enough, so that structural failure caused by secondary falling prevention during bit jumping is avoided. It should be noted that the first anti-dropping structure is a screw-thread fit between the lower end of the drill rod and the threaded hole.
The lower parts of two ends of each movable block are respectively provided with a step-shaped wedge block I, the upper parts of two ends of each fixed block are respectively provided with a step-shaped wedge block II, and when the movable block and the fixed block are changed from an overlapped state to a state of the same circumference, the wedge blocks I and II on the opposite end surfaces of the movable block and the fixed block are matched. Further, during installation, after the movable block and the fixed block enter the annular groove along the arc-shaped groove, the lower end of the drill rod is completely matched with the threaded hole, the outer sleeve is rotated at the moment, so that the movable block and the fixed block are changed into a state of one circumference at the same position from a superposed state, and the movable block and the fixed block on the circumference form a second anti-falling structure; in the technical scheme, the lower parts of two ends of each movable block are respectively provided with a step-shaped wedge block I, the upper parts of two ends of each fixed block are respectively provided with a step-shaped wedge block II, when the outer sleeve is rotated, the movable blocks and the fixed blocks are gradually changed into a same circumferential state from a superposed state, the movable blocks gradually approach towards the fixed blocks until the step-shaped wedge blocks I and the step-shaped wedge blocks II are mutually matched, and the adjacent movable blocks and the fixed blocks are spliced into an integral arc-shaped block, at the moment, the arc length corresponding to the arc-shaped block is larger than the arc length corresponding to the arc-shaped groove, so that the arc-shaped block is prevented from moving out of the arc-shaped groove, the connection strength between the drill rod and the handle can be increased due to the arc length corresponding to the arc-shaped block, and the damage caused by hard collision between the arc-shaped block and the upper wall of the annular.
The outer circumference wall of the outer sleeve is provided with a plurality of connecting screw holes, the connecting screw holes are positioned above the blind holes, positioning pins are arranged in the screw holes, the outer circumference wall of the drill rod is provided with positioning screw holes corresponding to the connecting screw holes, and after the end part of the lower end of the drill rod is matched with the screw holes, the positioning pins are rotated to be matched with the positioning screw holes. Furthermore, the positioning pin is arranged on the outer circumferential wall of the outer sleeve, namely, after the connection between the drill rod and the drill bit is completed, the positioning pin exposed out of the handle part is rotated, so that the outer sleeve and the drill rod are ensured to form a whole, and the relative movement between the outer sleeve and the drill rod in the circumferential direction is prevented.
The arc length corresponding to the fixed block is smaller than that corresponding to the arc-shaped groove, the arc length corresponding to the movable block is R, the circumference of the circumference where the movable block is located is S, and R is less than S/8. Preferably, the arc length corresponding to the fixed block is smaller than the arc length corresponding to the arc-shaped groove, and the arc length corresponding to the movable block is smaller than the perimeter of the circumference where the one eighth movable block is located, so that on the premise that the movable block and the fixed block smoothly pass through the arc-shaped groove and enter the annular groove, the single movable block can move in the gap between the two fixed blocks, and further the two movable blocks and the two fixed blocks are located on the same circumference.
In the axial direction of the drill rod, the groove width of the annular groove is N, the thickness of the movable block is M, the thickness of the fixed block is L, and L + M is more than N and less than 1.5 (L + M). Preferably, the groove width of the annular groove is set within the range of (L + M) to 1.5 (L + M) by taking the axis of the drill rod as a reference, so that enough space is ensured when the movable block and the fixed block are converted from the initial state to the final state when the drill rod and the drill bit are installed, when N is more than 1.5 (L + M), the bit bounces, the lower end of the drill rod and the threaded hole move relatively, the bit moves downwards, after the lower end of the drill rod is completely separated from the threaded hole, the movable block or the fixed block can not be contacted with the upper wall of the annular groove, the drill bit is enabled to move downwards continuously under the condition of no connection support, the thickness of a part for limiting the drill bit is only the thickness from the upper arm of the annular groove to the upper end face of the handle part, however, the inherent strength of the part is limited, damage is easy to occur, and once the part is damaged, the probability that the drill bit falls off in the lifting process of the drill rod is directly increased.
And a packing round table is arranged on the outer circumferential wall at the upper end of the outer sleeve, and the lower end surface of the packing round table is attached to the upper end surface of the handle part after the lower end part of the drill rod is matched with the threaded hole. Furthermore, a packing round table is arranged on the outer circumferential wall at the upper end of the outer sleeve, so that after the connection process of the drill rod and the drill bit is finished, the lower end face of the packing round table is attached to the upper end face of the handle part, the upper end face of the handle part can be packed with the outside, and a sealing ring or a sealing ring can be additionally arranged between the contact faces of the upper end face and the handle part, so that the sealing grade of the contact faces is improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. on the premise of ensuring the connection stability of the drill bit and the drill rod, when the drill bit bounces due to the fact that the drill bit meets a stratum with uneven lithology, the two fixed blocks and the two movable blocks are located on the same circumference by rotating the outer sleeve, a second anti-falling structure is formed in the annular groove, and the probability that the drill bit falls is effectively reduced;
2. when the drill bit meets the stratum with uneven lithology, the drill bit can rotate reversely, the drill rod and the outer sleeve form a whole after being matched by threads, the drill rod keeps circular motion continuously, after the drill bit rotates reversely, the threaded hole is matched with the threads at the lower end of the drill rod to lose efficacy, the drill bit moves downwards for a certain distance, so that the two movable blocks or the fixed blocks can be directly contacted with the upper wall of the arc-shaped groove, the friction between the two can drive the movable block to rotate along the same direction of the drill bit, and because the rotating direction of the external thread is opposite to that of the threaded hole, that is, the reverse rotation of the drill bit can only drive the outer sleeve to move downwards along the axis of the outer sleeve, and the connection stability between the outer sleeve and the drill rod cannot be disturbed at all, so that the two movable blocks and the fixed block are finally ensured to be kept in a state of one circumference at the same position, and the reliability of the second anti-falling structure is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the handle;
FIG. 3 is a schematic structural view of a drill pipe;
fig. 4 is a bottom view of the drill rod and the outer sleeve.
Reference numbers and corresponding part names in the drawings:
1-a drill rod, 2-an outer sleeve, 3-a handle, 4-an arc groove, 5-an annular groove, 6-a movable block, 7-a drill bit, 8-a threaded hole, 9-an external thread, 10-a fixed block, 11-a wedge block I, 12-a wedge block II, 13-an internal thread, 14-a positioning pin and 15-a packing round table.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 to 4, the present embodiment includes a drill rod 1 and a drill bit 7, a blind hole is provided in the middle of the end surface of a handle 3 of the drill bit 7, a threaded hole 8 which is in threaded fit with the drill rod 1 is provided at the bottom of the blind hole, the blind hole is coaxial with the threaded hole 8, an annular groove 5 is provided on the inner circumferential wall of the blind hole, two arc-shaped grooves 4 which are communicated with the annular groove 5 are further provided on the end surface of the handle 3, an outer sleeve 2 is sleeved on the outer wall of the drill rod 1, two movable blocks 6 are respectively provided on both sides of the lower end surface of the outer sleeve 2, two fixed blocks 10 are symmetrically provided on the outer circumferential wall of the drill rod 1 along the axis of the drill rod 1, the two movable blocks 6 and the two fixed blocks 10 are both in a minor arc shape, the arc length corresponding to the movable block 6 is smaller than the arc length corresponding to the fixed block 10, the lower end of the drill rod 1 penetrates through the blind hole and then is matched with the internal threaded hole 8, and the rotating direction of the external thread 9 is opposite to that of the internal threaded hole 8; when the drill rod is used, the outer sleeve 2 is rotated until the movable blocks 6 and the fixed blocks 10 are in an overlapped state, the overlapped state means that the two movable blocks 6 are respectively located at the upper ends of the two fixed blocks 10, the outer sleeve 2 is moved downwards along the axis of the drill rod 1 until the movable blocks 6 and the fixed blocks 10 enter the annular groove 5 along the arc-shaped groove 4, the outer sleeve 2 is rotated again, so that the external threads 9 and the internal threads 13 on the outer wall of the drill rod 1 are matched, and the movable blocks 6 and the fixed blocks 10 are changed from the overlapped state to be respectively located at different points of the circumference where the annular.
In an initial state, the outer sleeve 2 is sleeved on the outer circumferential wall of the drill rod 1, and the internal thread 13 is not matched with the external thread 9; when the drill rod is used, the outer sleeve 2 is rotated, the two movable blocks 6 are respectively positioned at the upper ends of the two fixed blocks 10, namely the movable blocks 6 and the fixed blocks 10 are in a superposed state, the lower end of the drill rod 1 enters the handle part 3 of the drill bit 7 along the blind hole, the movable blocks 6 and the fixed blocks 10 move downwards along the arc-shaped groove 4 along with the lower end of the drill rod 1 until the movable blocks 6 and the fixed blocks 10 completely enter the annular groove 5, after the lower end of the drill rod 1 is completely matched with the internal thread hole 8, the outer sleeve 2 is rotated again, so that the movable blocks 6 and the fixed blocks 10 are changed from the superposed state to a same circumferential state, namely the two movable blocks 6 and the two fixed blocks 10 are respectively positioned at different points of the circumference where the annular groove 5 is positioned, at the moment, the arc length where the fixed blocks 10 are positioned and the arc length where the arc-shaped groove 4 are positioned are, when the drill bit 7 is bouncing, the drill bit 7 and the drill rod 1 move relatively in the circumferential direction, the thread between the drill bit 7 and the drill rod 1 fails to work, and the connection between the drill bit 7 and the drill rod 1 fails, at the moment, the two movable blocks 6 and the two fixed blocks 10 which are positioned on the same circumferential track continuously move circularly along with the drill rod 1, only two arc-shaped grooves 4 are arranged on the upper end surface of the handle part 3 to serve as openings, any one of the two movable blocks 6 and the two fixed blocks 10 cannot move upwards through the openings, so that the drill rod 1 and the handle part 3 are always in an effective connection state, the accident that the drill bit 7 is separated from the drill rod 1 is effectively avoided, an operator only needs to lift a plurality of drill rods 1, then reversely operate the installation process of the drill bit 7 and the drill rod 1, namely, the drill bit 7 can be quickly replaced, and the subsequent salvage, to ensure that the drilling process is completed on time.
It should be noted that when the drill bit 7 encounters a stratum with uneven lithology, the drill bit 7 is likely to rotate reversely, the drill rod 1 and the outer sleeve 2 form a whole through threaded fit, the drill rod 1 keeps circular motion continuously, after the drill bit 7 rotates reversely, the threaded fit of the inner threaded hole 8 and the lower end of the drill rod 1 fails, the drill bit 7 moves downwards for a certain distance, so that the two movable blocks 6 or the fixed block 10 are directly contacted with the upper wall of the arc-shaped groove 4, friction generated between the two movable blocks and the upper wall drives the movable blocks 6 to rotate along the same direction with the drill bit 7, and the rotation direction of the outer thread 9 is opposite to that of the inner threaded hole 8, that is, the reverse rotation of the drill bit 7 can only drive the outer sleeve 2 to move downwards along the axis thereof, and cannot generate any interference on the connection stability between the outer sleeve 2 and the drill rod 1, and finally ensure that the two movable blocks 6 and the fixed block 10 are kept in the same, so as to improve the stability of the second anti-falling structure.
Preferably, the two movable blocks 6 and the two fixed blocks 10 are in a minor arc shape, the arc length corresponding to the movable blocks 6 is smaller than the arc length corresponding to the fixed blocks 10, the arc-shaped groove 4 is provided for the movable blocks 6 and the fixed blocks 10 to pass through, that is, the arc length corresponding to the arc-shaped groove 4 is larger than the arc length corresponding to the fixed blocks 10, and the arc-shaped groove 4 is set in the minor arc shape, so that the arc where the two arc-shaped grooves 4 are located is removed from the circumference where the arc-shaped groove 4 is located, and the remaining circumference portion occupies more than one half of a unit circle, so that after the movable blocks 6 and the fixed blocks 10 enter the annular groove 5, a space for limiting the movable blocks 6 or the fixed blocks 10 to move in the vertical direction is formed in the annular groove 5 and is large enough, and the structural failure caused by the second falling prevention when. It should also be noted that the first anti-dropping structure is a threaded fit between the lower end of the drill rod 1 and the internal threaded hole 8.
Example 2
As shown in fig. 1, 3 and 4, in this embodiment, based on embodiment 1, stepped wedge blocks i 11 are provided at lower portions of both ends of each movable block 6, stepped wedge blocks ii 12 are provided at upper portions of both ends of each fixed block 10, and when the movable block 6 and the fixed blocks 10 are changed from a stacked state to a state of being located on the same circumference, the wedge blocks i 11 and ii 12 located on the end surfaces of the movable block 6 opposite to the fixed blocks are engaged with each other.
In the embodiment, after the movable block 6 and the fixed block 10 enter the annular groove 5 along the arc-shaped groove 4, the lower end of the drill rod 1 is completely matched with the internal threaded hole 8, and at the moment, the outer sleeve 2 is rotated, so that the movable block 6 and the fixed block 10 are changed from a superposed state to a state of a same circumference, and at the moment, the movable block 6 and the fixed block 10 on the circumference form a second anti-falling structure; in the technical scheme, the lower parts of the two ends of each movable block 6 are respectively provided with a step-shaped wedge block I11, a step-shaped wedge block ii 12 is provided at the upper portion of both ends of each fixing block 10, and when the outer sleeve 2 is rotated, in the process that the movable block 6 and the fixed block 10 are gradually changed from the overlapping state to the state of being in the same circle, the movable blocks 6 gradually approach the fixed blocks 10 until the step-shaped wedge-shaped blocks I11 and the step-shaped wedge-shaped blocks II 12 are mutually matched to ensure that the adjacent movable blocks 6 and the fixed blocks 10 are spliced into an integral arc-shaped block, at the moment, the arc length corresponding to the arc-shaped block is longer than that corresponding to the arc-shaped groove 4, so that the arc-shaped block is prevented from moving out of the arc-shaped groove 4, the arc-shaped groove 4 formed by splicing can increase the connection strength between the drill rod 1 and the handle 3, can avoid the damage caused by hard collision between the arc-shaped block and the upper wall of the annular groove 5 when the drill bit 7 jumps.
In this embodiment, a plurality of connection screw holes are further formed in the outer circumferential wall of the outer sleeve 2, the connection screw holes are located above the blind holes, positioning pins 14 are arranged in the screw holes, positioning screw holes corresponding to the connection screw holes are formed in the outer circumferential wall of the drill rod 1, and after the end portion of the lower end of the drill rod 1 is matched with the internal threaded hole 8, the positioning pins 14 are rotated, so that the positioning pins 14 are matched with the positioning screw holes. The positioning pin 14 is arranged on the outer circumferential wall of the outer sleeve 2, namely after the connection between the drill rod 1 and the drill bit 7 is completed, the positioning pin 14 exposed out of the handle part 3 is rotated, so that the outer sleeve 2 and the drill rod 1 are ensured to form a whole, and the relative movement between the outer sleeve 2 and the drill rod 1 in the circumferential direction is prevented.
Example 3
As shown in fig. 1 to 4, in the present embodiment, the outer circumferential wall at the upper end of the outer sleeve 2 is provided with a packing round table 15, and when the lower end of the drill rod 1 is engaged with the internal threaded hole 8, the lower end surface of the packing round table 15 is attached to the upper end surface of the shank 3. The outer circumferential wall at the upper end of the outer sleeve 2 is provided with the packing round table 15, so that after the connection process of the drill rod 1 and the drill bit 7 is finished, the lower end face of the packing round table 15 is attached to the upper end face of the handle part 3, the upper end face of the handle part 3 can be packed with the outside, and a sealing ring or a sealing ring can be additionally arranged between the contact faces of the upper end face and the lower end face of the handle part 3, so that the sealing grade of the contact faces is improved.
Preferably, the arc length corresponding to the fixed block 10 is smaller than the arc length corresponding to the arc-shaped groove 4, and the arc length corresponding to the movable block 6 is smaller than the perimeter of the circumference where the one eighth of the movable block 6 is located, so that on the premise that the movable block 6 and the fixed block 10 smoothly pass through the arc-shaped groove 4 and enter the annular groove 5, the single movable block 6 can move in the gap between the two fixed blocks 10, and further the two movable blocks 6 and the two fixed blocks 10 are located on the same circumference.
Preferably, the groove width of the annular groove 5 is set within the range of (L + M) ~1.5 (L + M) based on the axis of the drill rod 1, so as to ensure that when the drill rod 1 and the drill bit 7 are mounted, the movable block 6 and the fixed block 10 are changed from the initial state to the final state, and when N is greater than 1.5 (L + M), the drill bit 7 bounces, relative movement occurs between the lower end of the drill rod 1 and the internal threaded hole 8, the drill bit 7 moves down, and after the lower end of the drill rod 1 is completely separated from the internal threaded hole 8, the movable block 6 or the fixed block cannot contact with the upper wall of the annular groove 5, so that the drill bit 7 continues to move down without connection support, and at this time, the thickness of the component for limiting the drill bit 7 is only the thickness between the upper end face of the annular groove 5 and the upper end face of the shank 3, but the strength of the component is limited, so that damage is easily caused, and, the chance of the drill bit 7 falling off during the lifting of the drill rod 1 will be directly increased.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A connection structure for a drill bit and a drill rod, comprising a drill rod (1) and a drill bit (7), characterized in that: the middle part of the end face of a handle part (3) of the drill bit (7) is provided with a blind hole, the bottom of the blind hole is provided with a threaded hole (8) which is in threaded fit with the drill rod (1), the blind hole is coaxial with the threaded hole (8), the inner circumferential wall of the blind hole is provided with an annular groove (5), the end face of the handle part (3) is also provided with two arc-shaped grooves (4) which are communicated with the annular groove (5), the outer wall of the drill rod (1) is sleeved with an outer sleeve (2), two movable blocks (6) are respectively arranged on two sides of the lower end face of the outer sleeve (2), two fixed blocks (10) are symmetrically arranged on the outer circumferential wall of the drill rod (1) along the axis of the drill rod, the two movable blocks (6) and the two fixed blocks (10) are in an arc shape, the arc length corresponding to the movable block (6) is smaller than the arc length corresponding to the fixed block (, an external thread (9) matched with the internal thread (13) is arranged on the outer circumferential wall of the drill rod (1), the lower end of the drill rod (1) penetrates through the blind hole and then is matched with the threaded hole (8), and the rotating direction of the external thread (9) is opposite to that of the threaded hole (8); during the use, rotatory outer sleeve (2) is the superpose state until movable block (6) and fixed block (10), the superpose state means that two movable blocks (6) are located the upper end of two fixed blocks (10) respectively, the axis along drilling rod (1) moves outer sleeve (2) downwards, enter into to ring channel (5) along arc wall (4) until movable block (6) and fixed block (10), rotatory outer sleeve (2) once more, make external screw thread (9) and internal thread (13) cooperation on drilling rod (1) outer wall, change into respectively by the superpose state and be located the different positions of ring channel (5) place circumference until movable block (6) and fixed block (10).
2. A connection structure for a drill and a drill rod according to claim 1, wherein: each the lower part at movable block (6) both ends all is equipped with step form wedge I (11), each the upper portion at fixed block (10) both ends all is equipped with step form wedge II (12), when movable block (6) and fixed block (10) change into the state of a same place circumference from the superpose state, lies in movable block (6) and fixed block (10) wedge I (11) and the cooperation of wedge II (12) on the terminal surface in opposite directions.
3. A connection structure for a drill and a drill rod according to claim 1, wherein: the outer circumference wall of the outer sleeve (2) is provided with a plurality of connecting screw holes, the connecting screw holes are located above the blind holes, positioning pins (14) are arranged in the screw holes, the outer circumference wall of the drill rod (1) is provided with positioning screw holes corresponding to the connecting screw holes, and after the end part of the lower end of the drill rod (1) is matched with the threaded holes (8), the positioning pins (14) are rotated to enable the positioning pins (14) to be matched with the positioning screw holes.
4. A connection structure for a drill and a drill rod according to claim 1, wherein: the arc length corresponding to the fixed block (10) is smaller than that corresponding to the arc-shaped groove (4), the arc length corresponding to the movable block (6) is R, the circumference of the circumference where the movable block (6) is located is S, and R < S/8 is satisfied.
5. A connection structure for a drill and a drill rod according to claim 1, wherein: in the axial direction of the drill rod (1), the groove width of the annular groove (5) is N, the thickness of the movable block (6) is M, the thickness of the fixed block (10) is L, and L + M is more than N and less than 1.5 (L + M).
6. A connection structure for a drill and a drill rod according to claim 1, wherein: the outer circumferential wall of the upper end of the outer sleeve (2) is provided with a packing round table (15), and after the lower end of the drill rod (1) is matched with the threaded hole (8), the lower end face of the packing round table (15) is attached to the upper end face of the handle part (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910025510.7A CN109707323B (en) | 2019-01-11 | 2019-01-11 | Connecting structure for drill bit and drill rod |
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| CN201910025510.7A CN109707323B (en) | 2019-01-11 | 2019-01-11 | Connecting structure for drill bit and drill rod |
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| CN109707323A CN109707323A (en) | 2019-05-03 |
| CN109707323B true CN109707323B (en) | 2020-04-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112796679B (en) * | 2021-03-24 | 2023-01-20 | 唐山师范学院 | Petroleum geological exploration drill rod device |
| CN116122747B (en) * | 2023-02-10 | 2023-09-05 | 广东有色工程勘察设计院 | Drilling device and drilling method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301078A (en) * | 1994-05-10 | 1995-11-14 | Furukawa Co Ltd | Connection unit structure of rod and bit of rock drill |
| AU2009231791B2 (en) * | 2008-03-31 | 2012-04-05 | Center Rock Inc. | Down-the-hole drill drive coupling |
| CN207144850U (en) * | 2017-09-04 | 2018-03-27 | 贵州迈锐钻探设备制造有限公司 | Attachment means and drill bit drill rod connecting device |
| CN207944883U (en) * | 2017-12-30 | 2018-10-09 | 中石化江钻石油机械有限公司 | A kind of helicoid hydraulic motor anti-boom anti-drop device |
| CN108979546A (en) * | 2018-07-27 | 2018-12-11 | 四川西普石油物资装备有限公司 | A kind of PDC drill bit promoted with drilling rod connection reliability |
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