阅读说明：本技术 打捞装置及作业机械 (Fishing device and operation machine ) 是由 邓岳 张飞 宋青杰 于 2021-09-23 设计创作，主要内容包括：本发明提供一种打捞装置及作业机械。打捞装置包括主体部、活动部和伸缩部。活动部与主体部可活动地连接,伸缩部相对于主体部可伸缩,活动部运动时适于驱动伸缩部切换至伸出状态,当伸缩部处于伸出状态时,伸缩部适于与钻头卡接。根据本发明的打捞装置,通过设置活动部和伸缩部,在打捞钻头的过程中,利用活动部驱动伸缩部运动,当伸缩部切换至伸出状态时,伸缩部与钻头卡接,随着钻杆向上移动,打捞装置可以将钻头带出钻孔。由此,无需借助其他打捞设备,即可将钻头打捞上来,不但可以降低打捞成本,而且还简化了打捞过程,易于操作,失误率低,实用性强。(The invention provides a fishing device and an operating machine. The fishing device comprises a main body part, a movable part and a telescopic part. The movable part is movably connected with the main body part, the telescopic part is telescopic relative to the main body part, the movable part is suitable for driving the telescopic part to be switched to a stretching state during movement, and when the telescopic part is in the stretching state, the telescopic part is suitable for being connected with the drill bit in a clamping mode. According to the fishing device, the movable part and the telescopic part are arranged, the telescopic part is driven to move by the movable part in the process of fishing the drill bit, when the telescopic part is switched to the extending state, the telescopic part is clamped with the drill bit, and the fishing device can take the drill bit out of a drilled hole along with the upward movement of the drill rod. Therefore, the drill bit can be salvaged without other salvage equipment, so that the salvage cost can be reduced, the salvage process is simplified, the operation is easy, the error rate is low, and the practicability is high.)

1. A fishing device, comprising:

a main body portion;

a movable part movably connected with the main body part;

the telescopic part, the telescopic part for the main part is scalable, be suitable for the drive during the activity portion motion the telescopic part switches to the state of stretching out, works as the telescopic part is in during the state of stretching out, the telescopic part is suitable for with the drill bit joint.

2. A fishing device as claimed in claim 1, wherein the body portion comprises:

a first connection adapted to connect with a drill rod;

the middle connecting part is connected with the first connecting part, the middle connecting part is provided with a limiting track, and the movable part moves along the limiting track;

the second connecting portion, the second connecting portion with intermediate junction portion connects, the pars contractilis wears to locate the second connecting portion, and works as the pars contractilis is in when the state of stretching out, the pars contractilis stretched out to the outside of second connecting portion, the second connecting portion be suitable for insert to in the drill bit.

3. A fishing device according to claim 2, wherein the intermediate connection portion is hollow inside, the stopper rail is a through hole provided in the intermediate connection portion, and the stopper rail is provided in plurality and spaced apart in a circumferential direction of the intermediate connection portion.

4. A fishing device as claimed in claim 3, wherein the movable part comprises:

the pressure plate penetrates through the limiting rail and is suitable for moving along the limiting rail, and the pressure plate is suitable for abutting against the outer surface of the top plate of the drill bit;

the connecting rod is positioned in the middle connecting part, and one end of the connecting rod is connected with the pressure plate;

the conical part, the conical part with the other end of connecting rod is connected, the conical part passes through the connecting rod follows the pressure disk motion, the conical part with the pars contractilis cooperation, the conical part is suitable for the drive the pars contractilis switches to the state of stretching out.

5. A fishing device as claimed in claim 4, wherein the second connecting portion has a locating hole,

the expansion part includes:

the main body rod part penetrates through the positioning hole, a cutting part is arranged at one end, located inside the second connecting part, of the main body rod part, and the conical part is matched with the cutting part so as to drive the main body rod part to move along the axis direction of the positioning hole.

6. A fishing device as claimed in claim 5, wherein the telescopic section further comprises:

the limiting boss is connected with the end of the main body rod part and located inside the second connecting part to limit the length of the main body rod part extending to the outside of the second connecting part, and the limiting boss is suitable for stopping against the inner wall of the second connecting part.

7. A fishing device as claimed in claim 4, wherein the pressure plate is provided with an avoiding hole, and the structure between two adjacent limiting rails on the intermediate connecting part is arranged in the avoiding hole in a penetrating way.

8. A fishing device as claimed in claim 1, wherein the telescopic portion has a first wedge face and the movable portion has a second wedge face adapted to the first wedge face.

9. A fishing device as claimed in claim 1, wherein the telescopic portion is plural, the plurality of telescopic portions being spaced apart in a circumferential direction of the main body portion.

10. A work machine, comprising:

a drill stem;

a fishing device as claimed in any one of claims 1 to 9, the fishing device being removably connectable to an end of the drill pipe.

Technical Field

The invention relates to the technical field of engineering mechanical equipment, in particular to a fishing device and an operation machine.

Background

As one of the working machines, a drilling machine may include a rotary drilling rig. The rotary drilling rig is a construction machine for taking soil and forming a hole and pouring a pile, and drives a rotary bucket to rotate and cut soil by a drill rod, and then lifts the soil to the outside of a hole to unload the soil periodically and circularly. The rotary drilling rig has the characteristics of high hole forming speed, low pollution and strong maneuverability, and is mainstream equipment for pile foundation construction in the current market.

During the construction process of the rotary drilling rig, the drill bit often falls off, and the reasons are almost two conditions:

(1) the torque transmission between the drill tool connecting side and the drill rod square head is not uniform due to uneven hardness of the stratum at the bottom of the drill tool, and the welding seam process between the connecting side and the rib plate and between the connecting side and the cylinder body is unqualified, so that the drill tool connecting side and the cylinder body are subjected to desoldering, and the cylinder body falls into a hole;

(2) because the pin shaft between the drill rod square head and the drill tool connecting side is not firmly fixed, the pin shaft falls off to cause the drill tool to fall into the hole. Or because the design tolerance size between the drill rod square head and the drill tool connecting part is large, in the drilling process of the rotary drilling rig, the stress originally transmitted by the drill tool connecting part on the drill rod becomes the stress of the pin shaft, so that the pin shaft is broken by the shearing force, and the drill tool falls off.

When the drill bit of the rotary drilling rig falls into the drill hole, the drill bit needs to be salvaged, but the salvage success rate is low, the construction period is long, and the construction risk is large due to the fact that salvage equipment is simple and easy or the environment in the drill hole is severe.

Disclosure of Invention

The invention provides a fishing device and an operating machine, which are used for solving the defect of difficulty in fishing a drill bit in the prior art and achieving the purposes of simple fishing of the drill bit and no influence of the environment.

The invention provides a fishing device, comprising: a main body portion; a movable part movably connected with the main body part; the telescopic part, the telescopic part for the main part is scalable, be suitable for the drive during the activity portion motion the telescopic part switches to the state of stretching out, works as the telescopic part is in during the state of stretching out, the telescopic part be suitable for with the drill bit joint.

According to the present invention, there is provided a fishing device, the body portion including: a first connection adapted to connect with a drill rod; the middle connecting part is connected with the first connecting part, the middle connecting part is provided with a limiting track, and the movable part moves along the limiting track; the second connecting portion, the second connecting portion with intermediate junction portion connects, the pars contractilis wears to locate the second connecting portion, and works as the pars contractilis is in when the state of stretching out, the pars contractilis stretched out to the second connecting portion are outside, the second connecting portion are suitable for inserting to the drill bit in.

According to the fishing device provided by the invention, the middle connecting part is hollow, the limiting rails are through holes arranged on the middle connecting part, the limiting rails are multiple, and the limiting rails are spaced along the circumferential direction of the middle connecting part.

According to a fishing device provided by the present invention, the movable portion includes: the pressure plate penetrates through the limiting rail and is suitable for moving along the limiting rail, and the pressure plate is suitable for abutting against the outer surface of the top plate of the drill bit; the connecting rod is positioned in the middle connecting part, and one end of the connecting rod is connected with the pressure plate; the conical part, the conical part with the other end of connecting rod is connected, the conical part passes through the connecting rod follows the pressure disk motion, the conical part with the pars contractilis cooperation, the conical part is suitable for the drive the pars contractilis switches to the state of stretching out.

According to the fishing device provided by the invention, the second connecting part is provided with a positioning hole, and the telescopic part comprises: the main body rod part penetrates through the positioning hole, a cutting part is arranged at one end, located inside the second connecting part, of the main body rod part, and the conical part is matched with the cutting part so as to drive the main body rod part to move along the axis direction of the positioning hole.

According to the fishing device provided by the invention, the telescopic part further comprises: the limiting boss is connected with the end of the main body rod part and located inside the second connecting part to limit the length of the main body rod part extending to the outside of the second connecting part, and the limiting boss is suitable for stopping against the inner wall of the second connecting part.

According to the fishing device provided by the invention, the pressure plate is provided with the avoidance hole, and the structure between two adjacent limiting rails on the middle connecting part penetrates through the avoidance hole.

According to the fishing device provided by the invention, the telescopic parts are multiple, and the telescopic parts are spaced along the circumferential direction of the main body part.

According to the fishing device provided by the invention, the telescopic part is provided with a first wedge-shaped surface, and the movable part is provided with a second wedge-shaped surface matched with the first wedge-shaped surface.

The present invention provides a working machine, including: a drill pipe and a fishing device as described above removably connected to an end of the drill pipe.

According to the fishing device provided by the invention, the movable part and the telescopic part are arranged, the telescopic part is driven to move by the movable part in the process of fishing the drill bit, when the telescopic part is switched to the extending state, the telescopic part is clamped with the drill bit, and the fishing device can take the drill bit out of a drilled hole along with the upward movement of the drill rod. Therefore, the drill bit can be salvaged without other salvage equipment, so that the salvage cost can be reduced, the salvage process is simplified, the operation is easy, the error rate is low, and the practicability is high.

Drawings

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

FIG. 1 is a schematic structural view of a fishing device provided by the present invention;

FIG. 2 is a cross-sectional view of a fishing device provided by the present invention;

FIG. 3 is a schematic view of a portion of the structure of FIG. 2;

FIG. 4 is a schematic view of the fishing device of the present invention assembled with a drill bit;

FIG. 5 is a partial cross-sectional schematic view of the fishing device of the present invention assembled with a drill bit;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

FIG. 7 is a schematic illustration of a work machine according to the present disclosure;

reference numerals:

100: a working machine; 101: a drill bit; 1011: a top plate;

102: a drill stem; 103: a vehicle body; 104: drilling;

110: fishing the device; 120: a main body portion; 121: a first connection portion;

122: a pin hole; 123: an intermediate connecting portion; 124: a limiting track;

125: a second connecting portion; 126: positioning holes; 127: a guide plate;

130: a movable portion; 131: a platen; 132: avoiding holes;

133: a connecting rod; 134: a tapered portion; 140: a telescopic part;

141: a main body rod portion; 142: a cutting portion; 143: and a limiting boss.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The fishing device 110 and work machine 100 of the present invention are described below with reference to fig. 1-7. It should be noted that the work machine 100 may have a function of the drill 104, for example, the work machine 100 may be a drilling machine. Drilling machines (drilling machines) are machines for drilling in mines. For example, the drilling machine may be a rotary drilling rig.

Rotary drilling rigs may also be referred to as rotary excavators, or drivers. The rotary drilling rig is a comprehensive drilling rig and has the characteristics of high hole forming speed, less pollution, strong maneuverability and the like. Short auger bits perform dry excavation operations, and rotary drill bits may also be used to perform wet excavation operations with mud dado. The rotary drilling rig can be matched with a hammer to drill and dig holes in hard stratums. If the reamer is matched with a reaming head drilling tool, reaming operation can be carried out at the bottom of the hole. The rotary excavating machine adopts a plurality of layers of telescopic drill rods, has less drilling auxiliary time and low labor intensity, does not need slurry to discharge slag circularly, saves cost and is particularly suitable for the basic construction of urban construction.

As shown in fig. 6, work machine 100 may include a body 103, a drill pipe 102, a drill bit 101, and a fishing device 110.

Wherein, drilling rod 102 is the telescopic drilling rod, and drilling rod 102 is connected with automobile body 103, and drill bit 101 is connected with the tip detachably of drilling rod 102. It should be noted that, under different working conditions, different types of drill bits 101 are required, and the drill bits 101 are removed and replaced, so that the unused requirements of the working machine 100 can be met. Additionally, when drill bit 101 is dropped into borehole 104, fishing device 110 may be installed at the end of drill pipe 102 to fish drill bit 101 dropped into borehole 104.

As shown in fig. 3 and 4, fishing device 110 may be connected between drill pipe 102 and drill bit 101, such that drill pipe 102 may drive fishing device 110 into drill hole 104, and after fishing device 110 is connected to drill bit 101, drill pipe 102 and fishing device 110 move up, thereby driving drill bit 101 to move up, and further, drill bit 101 may be taken out of drill hole 104.

Referring to fig. 1, 2 and 5, a fishing device 110 according to an embodiment of the present invention includes: a main body part 120, a movable part 130, and a stretchable part 140.

Referring to fig. 2, the body portion 120 may serve as a cradle for the fishing device 110. The movable portion 130 is movably connected to the main body portion 120, for example, the movable portion 130 is movable in the up-down direction as shown in fig. 2, and when one of the movable portion 130 and the main body portion 120 is driven by an external force, it can move relative to the other. The telescopic part 140 is telescopic relative to the main body part 120, the movable part 130 is suitable for driving the telescopic part 140 to be switched to an extending state when moving, and the telescopic part 140 is suitable for being clamped with the drill bit 101 when the telescopic part 140 is in the extending state.

It should be explained that, as shown in fig. 2 and 3, when the drill rod 102 extends into the drill hole 104 to a certain depth during fishing of the drill bit 101, part of the structure of the main body 120 may move into the drill bit 101, the movable portion 130 is stopped by the top of the drill bit 101, part of the structure of the movable portion 130 stays outside the drill bit 101, and part of the structure of the movable portion 130 is located inside the drill bit 101.

When the drill rod 102 continues to move downwards, the main body part 120 moves downwards along with the drill rod 102, the movable part 130 moves upwards relative to the main body part 120 as the movable part 130 is stopped by the top of the drill bit 101, the structure of the movable part 130 in the drill bit 101 is stopped by the telescopic part 140, and the movable part 130 pushes the telescopic part 140 to move until the telescopic part 140 is switched to the extending state. At this time, part of the structure of the telescopic part 140 extends out of the main body part 120, and the telescopic part 140 is engaged with the drill bit 101. After the telescopic part 140 is completely clamped with the drill bit 101, the fishing device 110 is moved upwards through the drill rod 102, the drill bit 101 can be taken out of the drill hole 104 by the fishing device 110, and the drill bit 101 is fished when the drill bit 101 is moved out of the drill hole 104.

Here, it should also be noted that work machine 100 is typically provided with a sensor to measure the depth of borehole 104 and a sensor to record the angle of rotation of drill pipe 102. During drilling, work machine 100 records the rotation angle of drill rod 102 and the depth of drill hole 104, thereby estimating the depth of drill bit 101 and the angle at which drill bit 101 rotates. If the drill bit 101 is dropped during the construction, the depth and the rotation angle of the drill bit 101 can be previously determined when the fishing device 110 is fed into the borehole 104. Thus, when the fishing device 110 is inserted into the borehole 104, the angle and depth of the fishing device 110 are adjusted, the main body 120 can be smoothly inserted into the drill bit 101, and the expansion part 140 can be precisely engaged with the drill bit 101, so that the drill bit 101 can be smoothly fished out.

According to the fishing device 110 provided by the embodiment of the invention, the movable part 130 and the telescopic part 140 are arranged, the telescopic part 140 is driven by the movable part 130 to move in the process of fishing the drill bit 101, when the telescopic part 140 is switched to the extending state, the telescopic part 140 is clamped with the drill bit 101, and the fishing device 110 can take the drill bit 101 out of the drill hole 104 along with the upward movement of the drill rod 102. Therefore, the drill bit 101 can be salvaged without other salvage equipment, so that the salvage cost can be reduced, the salvage process is simplified, the operation is easy, the error rate is low, and the practicability is high.

Referring to fig. 1 and 2, according to some embodiments of the invention, the body portion 120 may include: a first connection part 121, an intermediate connection part 123, and a second connection part 125. Wherein the first connection portion 121 is adapted to be connected to the drill rod 102. For example, the first connection part 121 has a square hole inside, the end of the drill rod 102 is a square head fitting the square hole, and the first connection part 121 and the drill rod 102 are fixed by a pin.

Here, it should be noted that a through hole or an end slot may also be provided at the first connection portion 121, an end of the drill rod 102 may be adapted to the corresponding through hole or end slot, and the first connection portion 121 and the end of the drill rod 102 are connected by a pin.

Further, as shown in fig. 1, the first connection portion 121 has a pin hole 122, and when the drill rod 102 is inserted into the square hole of the first connection portion 121, the pin may pass through the pin hole 122 and be fixed with a hole on the drill rod 102, so that the body portion 120 may be fixed on the drill rod 102. Here, in order to improve the connection stability of the body part 120 and the drill rod 102, the pin hole 122 may be plural; accordingly, the number of the pins may be plural.

Referring to fig. 1 and 2, the intermediate connecting portion 123 is connected to the first connecting portion 121, the intermediate connecting portion 123 has a limiting rail 124, and the movable portion 130 can move along the limiting rail 124. For example, as shown in fig. 2, the stopper rail 124 may extend in the up-down direction shown in fig. 2, so that the movable portion 130 may move in the up-down direction.

When the working machine 100 vertically punches a hole, the limiting rail 124 extends in the vertical direction, and at this time, the movable part 130 can freely slide to the lower end of the limiting rail 124 under the action of gravity; when the drill rod 102 moves to the vicinity of the fallen drill bit 101, the movable portion 130 overlaps with the top plate 1011 of the drill bit 101; when the drill rod 102 moves downwards continuously, the movable part 130 moves upwards relative to the main body part 120 along the limiting track 124 under the stopping action of the top plate 1011; when the movable portion 130 moves upward, the extendable portion 140 is driven to switch to the extended state.

In addition, to facilitate guiding the fishing device 110 into the borehole 104, the fishing device 110 may also be provided with a guide plate 127, the guide plate 127 extending in the circumferential direction of the fishing device 110. Thus, as the fishing device 110 moves up and down within the borehole 104, the guide plate 127 may guide the fishing device 110 to move in a vertical direction, preventing the fishing device 110 from tilting within the borehole 104. Further, the guide plate 127 may be located between the first connection part 121 and the intermediate connection part 123.

As shown in fig. 2 and 3, the second connection portion 125 is connected to the intermediate connection portion 123. For example, the first connection portion 121 is located at an upper end of the intermediate connection portion 123, and the second connection portion 125 is located at a lower end of the intermediate connection portion 123. Second connection 125 is adapted for insertion into drill bit 101. The expansion part 140 is inserted into the second connection part 125. When the telescopic part 140 is in the extended state, one end of the telescopic part 140 is located inside the second connection part 125, and the other end of the telescopic part 140 is located outside the second connection part 125. At this time, the second connecting portion 125 has a supporting function on the expansion portion 140, so that the expansion portion 140 can be maintained in an extended state, thereby improving stability and firmness of the engagement between the expansion portion 140 and the drill bit 101.

According to some embodiments of the present invention, the telescopic part 140 may be plural, and the plurality of telescopic parts 140 are spaced apart in a circumferential direction of the main body part 120. Therefore, the drill bit 101 can be clamped by the plurality of telescopic parts 140, clamping force is applied to the drill bit 101 in the circumferential direction by the telescopic parts 140, and the drill bit 101 can stably move upwards along with the fishing device 110 in the process that the drill rod 102 moves upwards, so that the fishing success rate can be improved, and the operation is convenient.

In some embodiments, the middle connection portion 123 is hollow, the limiting rail 124 is a through hole provided in the middle connection portion 123, the limiting rail 124 is plural, and the plural limiting rails 124 are spaced apart along the circumferential direction of the middle connection portion 123. In this way, not only the weight of the intermediate connection part 123 can be reduced by the hole structure, but also the movable part 130 can be restricted by the plurality of stopper rails 124, so that the movable part 130 can stably move. According to some embodiments of the present invention, the movable portion 130 may be an integrally formed part, so as to simplify the manufacturing process of the movable portion 130.

According to some embodiments of the present invention, the telescopic portion 140 has a first wedge surface, and the movable portion 130 has a second wedge surface adapted to the first wedge surface, so that the movable portion 130 can push the telescopic portion 140 to move by the cooperation of the first wedge surface and the second wedge surface, and the telescopic portion 140 can be flexibly switched to the extended state.

The shape of the movable portion 130 is not particularly limited, and for example, as shown in fig. 2 and 3, according to some embodiments of the present invention, the movable portion 130 may include: a pressure plate 131, a link 133 and a tapered portion 134. The pressing plate 131 is disposed through the limiting rail 124, and the pressing plate 131 is adapted to move along the limiting rail 124, that is, the limiting rail 124 can limit the motion track of the pressing plate 131. Further, the pressing plate 131 has an avoiding hole 132, and the structure between two adjacent limiting rails 124 on the intermediate connecting portion 123 penetrates through the avoiding hole 132.

It is understood that, with the avoidance hole 132 as a boundary, a portion of the pressure plate 131 on one side of the avoidance hole 132 is located inside the intermediate connection portion 123, and a portion of the pressure plate 131 on the other side of the avoidance hole 132 is located outside the intermediate connection portion 123. The limiting rails 124 are through-hole structures, the solid part of the pressure plate 131 between the two limiting rails 124 penetrates through the avoiding hole 132, so that a nested structure is formed between the pressure plate 131 and the middle connecting part 123, the limiting rails 124 are used for limiting the movement of the pressure plate 131 in the up-down direction, and the avoiding hole 132 is used for limiting the movement of the pressure plate 131 on the inner side and the outer side of the middle connecting part 123, so that the pressure plate 131 can stably move along the limiting rails 124, and the movement flexibility of the pressure plate 131 can be improved.

As shown in fig. 3, the link 133 is located in the intermediate connecting portion 123, and the link 133 is connected between the pressure plate 131 and the tapered portion 134, the tapered portion 134 follows the pressure plate 131 through the link 133, the tapered portion 134 is engaged with the telescopic portion 140, and the tapered portion 134 is adapted to drive the telescopic portion 140 to be switched to the extended state.

Specifically, during fishing of drill bit 101, as the end of rod 102 contacts drill bit 101 and rod 102 moves further downward, pressure plate 131 may abut the outer surface of top plate 1011 of drill bit 101, with pressure plate 131 stationary relative to drill bit 101 under abutment of top plate 1011. However, as the drill rod 102 drives the main body 120 to move downwards continuously until the telescopic portion 140 is located inside the drill bit 101, the pressure plate 131 moves upwards relative to the main body 120. During the process that the pressure plate 131 moves upwards relative to the main body part 120, the tapered side surface of the tapered part 134 is in contact fit with the telescopic part 140, the tapered part 134 presses the telescopic part 140, and the telescopic part 140 is switched to the extending state under the effect of the pressing force.

When the telescopic part 140 is switched to the extended state, the telescopic part 140 is adapted to be engaged with the top plate 1011 of the drill bit 101. When the drill rod 102 moves upwards, the fishing device 110 moves upwards along with the drill rod 102, and the telescopic part 140 is clamped with the drill bit 101, so that the fishing device 110 drives the drill bit 101 to move upwards until the drill bit 101 moves out of the drill hole 104, and the task of fishing the drill bit 101 is completed.

According to some embodiments of the present invention, in conjunction with fig. 3, the second connection portion 125 has a positioning hole 126. As shown in fig. 2 and 3, the telescopic part 140 may include a body rod part 141 and a limit boss 143. Wherein, main part pole portion 141 wears to locate in the locating hole 126, makes things convenient for the pars contractilis 140 to stretch out outside second connecting portion 125 like this, and locating hole 126 has spacing, supporting role to main part pole portion 141 simultaneously, can make pars contractilis 140 keep in the state of stretching out steadily, and then can promote pars contractilis 140 and drill bit 101 complex stability, promotes drill bit 101 and salvages the success rate.

The end of the main body rod portion 141 located inside the second connecting portion 125 has a cutting portion 142, and the tapered portion 134 is matched with the cutting portion 142 to drive the main body rod portion 141 to move along the axial direction of the positioning hole 126. It should be noted that the surface of the cutting portion 142 may be an inclined surface adapted to the tapered sidewall of the tapered portion 134, so that the cutting portion 142 guides the tapered portion 134 during the upward movement of the tapered portion 134.

On the one hand, when the tapered portion 134 pushes the telescopic portion 140, the movement stability of the telescopic portion 140 can be improved, so that the telescopic portion 140 can be smoothly switched to the extended state; on the other hand, under the guidance of the cutting portion 142, the tapered portion 134 can move up smoothly, so that the tapered portion 134 can be prevented from being stuck.

Here, in the process of switching the telescopic part 140 to the extended state, the telescopic part 140 is gradually extended to the outside of the second connection part 125, and in order to prevent the telescopic part 140 from falling to the outside of the second connection part 125, a limit boss 143 may be provided on the main body rod part 141. As can be seen from fig. 3, the limiting protrusion 143 is connected to an end of the main body rod portion 141, and the limiting protrusion 143 is located inside the second connecting portion 125 to limit a length of the main body rod portion 141 extending to an outside of the second connecting portion 125. For example, the limit projection 143 is adapted to abut against an inner wall of the second connection portion 125. In some examples, the limiting boss 143 is disposed opposite to the cutting part 142 in the up-down direction, for example, the limiting boss 143 is located above the cutting part 142.

In addition, after the drill bit 101 is salvaged, when the fishing device 110 and the drill bit 101 need to be separated, the fishing device 110 can be vertically placed, the pressure plate 131, the connecting rod 133 and the conical part 134 of the movable part 130 can be sequentially arranged from top to bottom, and under the action of gravity, the movable part 130 moves downwards to the lowest point along the limiting rail 124.

At this time, the tapered portion 134 is separated from the cutting portion 142, the telescopic portion 140 is manually pushed to move the telescopic portion 140 toward the inside of the second connection portion 125, the telescopic portion 140 can be separated from the top plate 1011 of the drill bit 101, the telescopic portion 140 is not in contact with the top plate 1011 any more, the drill rod 102 continues to move upwards, the second connection portion 125 can be pulled out from the hole at the top of the drill bit 101, and the separation of the drill bit 101 and the fishing device 110 is completed.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.