阅读说明：本技术 一种旋挖钻头打捞的绳索定位机构、打捞装置及打捞方法 (Rope positioning mechanism, fishing device and fishing method for rotary drilling bit fishing ) 是由 曹燚 其他发明人请求不公开姓名 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种旋挖钻头打捞的绳索定位机构,包括一个伸入到井下的组合拼接式的直筒,直筒的底部内侧固定定位装置；定位装置包括中空圆柱型结构的套筒和对称分布在套筒底部的多个连接块,多个连接块的中间围成一个用于钻头端部通过的圆形定位区域,任意一个连接块的一端均水平设置有外侧开口的轴套滑移腔,另一端开设有销轴安装孔,轴套滑移腔内插接一个可活动伸出的轴套。本发明还公开了一种旋挖钻头的打捞装置以及打捞方法,包括机车和起吊定位机构的立柱,立柱上通过钢缆吊装动力驱动平台。此打捞装置能代替水鬼完成和井下钻头自动连接的工作,避免人员死亡。(The invention discloses a rope positioning mechanism for fishing a rotary drilling bit, which comprises a combined spliced straight cylinder extending into the underground, wherein a positioning device is fixed on the inner side of the bottom of the straight cylinder; the positioning device comprises a sleeve with a hollow cylindrical structure and a plurality of connecting blocks which are symmetrically distributed at the bottom of the sleeve, the middle of each connecting block is surrounded into a circular positioning area for the end part of a drill bit to pass through, one end of any connecting block is horizontally provided with an outside open shaft sleeve sliding cavity, the other end of any connecting block is provided with a pin shaft mounting hole, and a movable extending shaft sleeve is inserted into the shaft sleeve sliding cavity. The invention also discloses a fishing device and a fishing method of the rotary drilling bit, the fishing device comprises a locomotive and an upright post of the hoisting positioning mechanism, and the power driving platform is hoisted on the upright post through a steel cable. The fishing device can replace water ghost to finish the work of automatic connection with the underground drill bit, and the death of personnel is avoided.)

1. The utility model provides a rope positioning mechanism that drill bit was salvaged soon, includes a straight section of thick bamboo (4) that stretch into the combination concatenation formula in the pit, its characterized in that:

a positioning device (6) is fixed on the inner side of the bottom of the straight cylinder (4);

the positioning device (6) comprises a hollow cylindrical sleeve (61) and a plurality of connecting blocks (62) which are symmetrically distributed at the bottom of the sleeve (61), the middles of the connecting blocks (62) enclose a circular positioning area for the end part of the drill bit (7) to pass through, a gap is formed between every two adjacent connecting blocks (62), and an arc-shaped limiting block (63) is arranged at the top of the gap;

one end of any connecting block (62) is horizontally provided with a shaft sleeve sliding cavity (6201) with an opening on the outer side, the other end of the connecting block is provided with a pin shaft mounting hole (6202), a shaft sleeve (64) which can movably extend out is inserted into the shaft sleeve sliding cavity (6201), the outer end of the shaft sleeve (64) penetrates out of the opening and extends towards the direction of the other adjacent connecting block (62), the shaft sleeve (64) corresponds to the pin shaft mounting groove (6202) on the side surface of the other connecting block (62), and a fixing plate (6203) is mounted in the pin shaft mounting groove (6202);

an inner piston block (6401) and an outer piston block (6402) are fixedly connected to a shaft sleeve (64) positioned in a shaft sleeve sliding cavity (6201) respectively, the inner piston block (6401) and the outer piston block (6402) are in sliding fit with the inside of the shaft sleeve sliding cavity (6201), and the tops of two sides of the shaft sleeve sliding cavity (6201) are communicated with a first output hydraulic pipe (51) and a second output hydraulic pipe (52) respectively;

hydraulic oil is respectively and alternately injected into the shaft sleeve sliding cavity (6201) in the first output hydraulic pipe (51) and the second output hydraulic pipe (52), and the shaft sleeve (64) is pushed to slide in the shaft sleeve sliding cavity (6201);

a plurality of ropes (65) are further mounted inside the sleeve (61), the outer end portions of the ropes (65) are fixedly connected with pin shafts (6501), and the pin shafts (6501) penetrate through the fixing plate (6203) and are movably clamped on the shaft sleeve (64).

2. A cord positioning mechanism as recited in claim 1, further comprising: the straight cylinder (4) is formed by coaxially splicing a plurality of pile casings (41), two adjacent pile casings (41) are fixedly connected through a flange, and the sleeve (61) is fixedly connected with the bottom of the pile casing (41) located at the lower end through a bolt.

3. A cord positioning mechanism as recited in claim 1, further comprising: an installation ring (6101) is fixedly sleeved on the outer side of the sleeve (61), a plurality of centralizing wheels (6102) are installed on the installation ring (6101) in a central symmetry manner, the centralizing wheels (6102) are in contact with the well wall, and the rolling direction of the centralizing wheels is parallel to the axis of the sleeve (61).

4. A cord positioning mechanism as recited in claim 1, further comprising: a plurality of hangers (6103) are installed at the top of the sleeve (61), a rotating shaft is installed on the hangers (6103) in a rotating manner, a rope (65) is fixedly wound on the rotating shaft, a handle (6103a) is arranged at the end part of the rotating shaft, and the number of the rope (65) is consistent with that of the connecting blocks (62).

5. A cord positioning mechanism as recited in claim 4, further comprising: a plurality of grooves are symmetrically and concavely arranged on a pin shaft (6501) at the outer end part of the rope (65), a limiting block (6502) is clamped in the grooves in a sliding mode, the limiting block (6502) is fixedly connected with the bottom of the groove through a spring (6503), the outer end of the limiting block (6502) is of an inclined plane structure, and the inclined plane faces to the tail end of the pin shaft (6501);

a pin hole (6203a) is formed in the fixing plate (6203) corresponding to the pin shaft (6501), and the pin shaft (6501) is clamped and penetrates through the pin hole (6203 a).

6. A cord positioning mechanism as recited in claim 5, further comprising: the outer end of the shaft sleeve (64) is provided with a hollow cylindrical limiting pin sleeve (6403), a pin opening (6403a) with the same diameter as the pin shaft (6501) is formed in the limiting pin sleeve (6403), and a through groove (6403b) for extending out of the limiting block (6502) is formed in the side wall of the limiting pin sleeve (6403).

7. A cord positioning mechanism as recited in claim 1, further comprising: any one pin shaft sliding cavity (6201) is communicated with a first output hydraulic pipe (51) and a second output hydraulic pipe (52), all the first output hydraulic pipes (51) extend towards the upper part of the pile casing (41) and are simultaneously communicated with the bottom of a first pipeline joint (35), and the top of the first pipeline joint (35) is communicated with a first hydraulic pipe (104); all the second output hydraulic pipes (52) also extend towards the upper part of the casing (41) and are simultaneously communicated with the bottom of a second pipeline joint (36), the top of the second pipeline joint (36) is communicated with a second hydraulic pipe (105), and the first pipeline joint (35) and the second pipeline joint (36) are coaxially arranged at the top of the casing (41).

8. A cord positioning mechanism as recited in claim 7, further comprising: the first hydraulic pipe (104) and the second hydraulic pipe (105) are respectively connected with two output ends of the electromagnetic directional valve (103), the input end of the electromagnetic directional valve (103) is communicated with the hydraulic pump (102), and the input end of the hydraulic pump (102) is communicated with the hydraulic tank (101) filled with hydraulic oil.

9. A fishing device based on a rope positioning mechanism as claimed in any one of claims 1-8, wherein: the device comprises a locomotive (1) and an upright post (2) for hoisting the positioning mechanism, wherein the bottom of the upright post (2) is hinged and installed at the outer end of an installation platform on the locomotive (1); the middle part of the upright post (2) is hinged with one end of an inclined support hydraulic cylinder (201), and the other end of the inclined support hydraulic cylinder (201) is hinged and installed on an installation platform of the locomotive (1);

the top of the upright post (2) is fixedly provided with a horizontal hanging bracket (202) which is horizontally arranged, one end of the horizontal hanging bracket (202) is provided with a top pulley (203), the other end of the horizontal hanging bracket (202) is provided with a traction mechanism, one end of a steel cable (205) penetrates through the top pulley (203) and the traction mechanism and is fixedly connected with a counterweight pulley block (204), and the other end of the steel cable (205) is fixedly connected onto a pulley (302) at the top of the power driving platform (3).

The power driving platform (3) is hoisted on the upright post (2) through a steel cable, the power driving platform (3) comprises a cylindrical platform (31) with an opening at the bottom, a sliding claw (301) is fixedly arranged on one side of the cylindrical platform (31), and the sliding claw (301) is clamped on a guide sliding rail (206) on the surface of the upright post (2) in a tile-holding manner;

the cylinder platform (31) bottom fixed connection external tooth slewing bearing (32)'s inner circle, the outer lane of external tooth slewing bearing (32) passes through bolt and straight section of thick bamboo top rigid coupling, and outwards extends mounting panel (3101) on cylinder platform (31), rotate on mounting panel (3101) and install a gear (33) through motor (34) drive, gear (33) and external tooth slewing bearing (32) outer lane meshing.

10. A fishing method of a rotary drilling bit is characterized in that the fishing device according to claim 9 is adopted, and the method comprises the following specific steps:

s1: controlling the inclined supporting hydraulic cylinder (201) to finely adjust the position of the upright post (2) so that the straight cylinder (4) is positioned above the drilled well, pulling out the rope (65) from the rotating shaft, and enabling a pin shaft (6501) at the tail end of the rope to penetrate through a pin hole (6203a) in a fixing plate (6203) and be clamped on the outer end face of the fixing plate (6203);

s2: lowering a steel cable (205) through a conventional traction mechanism to enable the straight cylinder (4) to enter a well;

s3: when the straight cylinder (4) is lowered to meet a resistance, the power driving platform (3) drives the straight cylinder to rotate in the well in a positive and negative direction at an angle of 30-180 degrees in a small range until the straight cylinder is lowered to the bottommost end and is sleeved at the end part of the drill bit, so that a gap between the two connecting blocks (62) is positioned on an ear plate of the drill bit (7);

s4: starting a hydraulic pump (102) to inject hydraulic oil into first hydraulic pipes (104), uniformly dispersing the hydraulic oil into each first output hydraulic pipe (51) through a first pipeline joint (35), pushing a sleeve shaft (64) to extend outwards, and enabling the outer end of the sleeve shaft (64) to penetrate through an ear plate hole (701) in a drill bit (7) in the extending process so that a pin bush (6403) at the end part of the sleeve shaft (64) is sleeved on a pin shaft (6501);

s5: then, oil is injected into the second hydraulic pipe (105) through the electromagnetic directional valve (103), so that the sleeve shaft (64) is contracted into the pin shaft sliding cavity (602), the rope (65) penetrates through an ear plate hole (701) of the drill bit (7), and the fixing of the rope positioning mechanism and the drill bit (7) is completed;

s6: the steel cable (205) is pulled up through the traction mechanism, and the straight cylinder (4) and the fixed drill bit (7) are pulled out.

Technical Field

The invention relates to the technical field of engineering mechanical equipment, in particular to a rope positioning mechanism, a fishing device and a fishing method for rotary drilling bit fishing.

Background

With the higher and higher requirements of railway and highway construction, the occupied proportion of the bridge in the railway and highway construction is larger and larger, and the construction speed of various bridges is higher and higher. The construction of the pile foundation of the bridge by adopting the drill bit of the pile driver is very common, and the rotary drilling is a construction process suitable for hole forming operation in building foundation engineering and is widely applied to foundation construction engineering such as municipal construction, highway bridges, high-rise buildings and the like. Along with the above, the drill jamming accident of the drilling machine often happens due to mechanical or human reasons and the like in the construction process. And the conventional treatment method is to employ a diver to submerge to the position where the drill bit falls and manually wear and hang a steel wire rope to take the drill bit back. The method has the defects of long construction period and high danger, workers need to submerge into slurry for manual fishing for dozens of meters, are dangerous to life, have high death rate and are easy to leave sequelae even if tasks are finished.

Therefore, a rope positioning mechanism, a fishing device and a fishing method for rotary drilling bit fishing are provided for solving the problems.

Disclosure of Invention

The invention aims to provide a rope positioning mechanism, a fishing device and a fishing method for fishing a rotary drilling bit, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a rope positioning mechanism for fishing a rotary drilling bit comprises a combined spliced straight cylinder extending into a well,

a positioning device is fixed on the inner side of the bottom of the straight cylinder;

the positioning device comprises a sleeve with a hollow cylindrical structure and a plurality of connecting blocks symmetrically distributed at the bottom of the sleeve, the middle of each connecting block is encircled to form a circular positioning area for the end part of a drill bit to pass through, a gap is formed between every two adjacent connecting blocks, and an arc-shaped limiting block is arranged at the top of the gap;

one end of any connecting block is horizontally provided with a shaft sleeve sliding cavity with an opening at the outer side, the other end of the connecting block is provided with a pin shaft mounting hole, a shaft sleeve which can movably extend out is inserted in the shaft sleeve sliding cavity, the outer end part of the shaft sleeve penetrates out of the opening and extends towards the direction of the other adjacent connecting block, the shaft sleeve corresponds to a pin shaft mounting groove on the side surface of the other connecting block, and a fixing plate is mounted in the pin shaft mounting groove;

the shaft sleeve positioned in the shaft sleeve sliding cavity is fixedly connected with an inner piston block and an outer piston block respectively, the inner piston block and the outer piston block are in sliding fit with the inside of the shaft sleeve sliding cavity, and the tops of two sides of the shaft sleeve sliding cavity are communicated with a first output hydraulic pipe and a second output hydraulic pipe respectively;

the first output hydraulic pipe and the second output hydraulic pipe respectively and alternately inject hydraulic oil into the shaft sleeve sliding cavity and push the shaft sleeve to slide in the shaft sleeve sliding cavity;

the inner part of the sleeve is also provided with a plurality of ropes, the outer end parts of the ropes are fixedly connected with a pin shaft, and the pin shaft penetrates through the fixed plate and is movably clamped on the shaft sleeve.

Preferably, the straight cylinder is formed by coaxially splicing a plurality of protective cylinders, two adjacent protective cylinders are fixedly connected through a flange, and the sleeve is fixedly connected with the bottom of the protective cylinder at the lower end through a bolt.

Preferably, the outer side of the sleeve is fixedly sleeved with an installation ring, a plurality of centralizing wheels are installed on the installation ring in a central symmetry mode, the centralizing wheels are in contact with the well wall, and the rolling direction of the centralizing wheels is parallel to the axis of the sleeve.

Preferably, a plurality of hanging brackets are installed at the top of the sleeve, rotating shafts are installed on the hanging brackets in a rotating mode, ropes are fixedly wound on the rotating shafts, handles are arranged at the end portions of the rotating shafts, and the number of the ropes is consistent with the number of the connecting blocks.

Preferably, a plurality of grooves are symmetrically and concavely arranged on the pin shaft at the outer end part of the rope, a limiting block is clamped in the grooves in a sliding mode, the limiting block is fixedly connected with the bottom of the groove through a spring, the outer end of the limiting block is of an inclined plane structure, and the inclined plane faces to the tail end of the pin shaft;

and a pin hole is formed in the fixing plate corresponding to the pin shaft, and the pin shaft is clamped and penetrates through the pin hole.

Preferably, the outer end part of the shaft sleeve is provided with a hollow cylindrical limiting pin sleeve, the limiting pin sleeve is provided with a pin opening consistent with the diameter of the pin shaft, and the side wall of the limiting pin sleeve is provided with a through groove for extending the limiting block.

Preferably, any one pin shaft sliding cavity is communicated with a first output hydraulic pipe and a second output hydraulic pipe, all the first output hydraulic pipes extend towards the upper part of the protective cylinder and are simultaneously communicated with the bottom of the first pipeline joint, and the top of the first pipeline joint is communicated with the first hydraulic pipe; all second output hydraulic pipes extend above the pile casing and are simultaneously communicated with the bottom of a second pipeline connector, the top of the second pipeline connector is communicated with a second hydraulic pipe, and the first pipeline connector and the second pipeline connector are coaxially arranged on the top of the pile casing.

Preferably, the first hydraulic pipe and the second hydraulic pipe are respectively connected with two output ends of the electromagnetic directional valve, the input end of the electromagnetic directional valve is communicated with the hydraulic pump, and the input end of the hydraulic pump is communicated with the hydraulic tank filled with hydraulic oil.

A fishing device of a rotary drilling bit comprises a locomotive and an upright post for hoisting a positioning mechanism, wherein the bottom of the upright post is hinged to the outer end of an installation platform on the locomotive; the middle part of the upright post is hinged with one end of an inclined support hydraulic cylinder, and the other end of the inclined support hydraulic cylinder is hinged and installed on an installation platform of the locomotive;

the top of the upright post is fixedly provided with a horizontal hanging bracket which is horizontally arranged, one end of the horizontal hanging bracket is provided with a top pulley, the other end of the horizontal hanging bracket is provided with a traction mechanism, one end of a steel cable penetrates through the top pulley and the traction mechanism and is fixedly connected with a counterweight pulley block, and the other end of the steel cable is fixedly connected on a pulley at the top of the power driving platform.

The power driving platform is hoisted on the upright post through a steel cable, the power driving platform comprises a cylindrical platform with an opening at the bottom, a sliding claw is fixedly arranged on one side of the cylindrical platform, and the sliding claw is clamped on a guide slide rail on the surface of the upright post in a tile-holding manner;

the cylindrical platform is characterized in that the bottom of the cylindrical platform is fixedly connected with an inner ring of the external tooth slewing bearing, an outer ring of the external tooth slewing bearing is fixedly connected with the top of the straight cylinder through a bolt, an installation plate extends outwards from the cylindrical platform, a gear driven by a motor is rotatably installed on the installation plate, and the gear is meshed with the outer ring of the external tooth slewing bearing.

A fishing method of a rotary drilling bit adopts the fishing device, and comprises the following specific steps:

s1: the inclined support hydraulic cylinder is controlled to be fine-tuned for the position of the upright column, so that the straight cylinder is positioned above the drilled well, the rope is pulled out from the rotating shaft, and a pin shaft at the tail end of the rope penetrates through a pin hole in the fixing plate and is clamped on the outer end face of the fixing plate;

s2: lowering a steel cable through a conventional traction mechanism to enable the straight cylinder to enter a well;

s3: when the straight cylinder is put down to meet a resistance, the power driving platform drives the straight cylinder to rotate in the well in a positive and negative direction at an angle not exceeding 90 degrees in a small range until the straight cylinder is put down to the bottommost end and is sleeved at the end part of the drill bit, so that a gap between the two connecting blocks is positioned on an ear plate of the drill bit;

s4: starting a hydraulic pump to inject hydraulic oil into the first hydraulic pipes, uniformly dispersing the hydraulic oil into each first output hydraulic pipe through the first pipeline joint, pushing the sleeve shaft to extend outwards, and enabling the outer end of the sleeve shaft to penetrate through the lug plate hole on the drill bit in the extending process so as to enable the pin sleeve at the end part of the sleeve shaft to be sleeved on the pin shaft;

s5: then, injecting oil into the second hydraulic pipe through the electromagnetic directional valve to enable the sleeve shaft to be contracted into the pin shaft sliding cavity, so that the rope penetrates through the ear plate hole of the drill bit to complete the fixation of the rope positioning mechanism and the drill bit;

s6: and pulling up the steel cable through the traction mechanism to pull out the straight cylinder together with the fixed drill bit.

Compared with the prior art, the invention has the beneficial effects that:

1. the fishing device can replace water ghost to finish the work of automatic connection with the underground drill bit, and the death of personnel is avoided.

2. The positioning device is fixedly installed below the power driving platform and is not prone to shaking, the size of the stand column of the equipment can be finely adjusted front and back, the positioning device is convenient to align to the lug plate hole of the drill bit, the power driving platform rotates forward and backward for 30-180 degrees, the output hydraulic pipe is prevented from being wound together, the protecting cylinders can be spliced, and transportation is facilitated.

3. The centering wheel is arranged on the outer side of the sleeve of the positioning device, so that the fishing device can conveniently enter a drilling well, the eccentric part of the protective sleeve is prevented, and the fishing device can conveniently align to the axis of the drill bit.

4. The surface of the arc-shaped limiting block is arranged into an arc surface, and slurry cannot be reserved between the arc-shaped limiting block and the drill bit ear plate through line contact.

Drawings

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

FIG. 2 is a front view of the present invention;

FIG. 3 is a partial cross-sectional view of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic illustration of the hydraulic system of the present invention;

FIG. 5 is a schematic view of a power driven platform of the present invention;

FIG. 6 is a schematic structural view of a straight cylinder and a positioning device according to the present invention;

FIG. 7 is a cross-sectional view of a straight cylinder and positioning device of the present invention;

FIG. 8 is an enlarged view of a portion of the cord positioning mechanism of FIG. 7 in accordance with the present invention;

FIG. 9 is an enlarged view taken at A of FIG. 8 in accordance with the present invention;

FIG. 10 is an enlarged view taken at B of FIG. 8 in accordance with the present invention;

FIG. 11 is a schematic view of a positioning device according to the present invention;

FIG. 12 is a sectional view of the connector block assembly of the present invention;

FIG. 13 is a schematic view of a connector block of the present invention;

fig. 14 is a schematic view of the rope construction of the invention;

fig. 15 is a schematic view of the pin structure of the present invention.

In the figure: 1 locomotive, 101 hydraulic tank, 102 hydraulic pump, 103 electromagnetic directional valve, 104 first hydraulic pipe, 105 second hydraulic pipe, 2 upright post, 201 diagonal bracing hydraulic cylinder, 202 horizontal hanger, 203 top pulley block, 204 counterweight pulley block, 205 steel cable, 206 guide slide rail, 3 power driving platform, 301 sliding claw, 302 pulley, 31 cylindrical platform, 3101 mounting plate, 32 external tooth rotary support, 33 gear, 34 motor, 35 first pipeline joint, 36 second pipeline joint, 4 straight cylinder, 41 protecting cylinder, 51 first output hydraulic pipe, 52 second output hydraulic pipe, 6 positioning device, 61 sleeve, 6101 mounting ring, 6102 centralizing wheel, 6103 hanger, 62 connecting block, 6201 shaft sleeve sliding cavity, 6202 pin shaft mounting groove, 6203 fixing plate, 6203a pin hole, 63 arc limiting block, 6301 contact switch, 64 shaft sleeve, 6401 piston inner block, 6402 outer piston block, 6403 limiting pin sleeve, 6403a pin opening, 6403b, 65 ropes, 6501 pin shafts, 6502 limit blocks, 6503 springs, 7 drill bits and 701 lug holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-15, the present invention provides a technical solution: a rope positioning mechanism for rotary drilling bit fishing comprises a combined splicing type straight cylinder 4 extending into a well, as shown in figures 6-7, the straight cylinder 4 is formed by coaxially splicing a plurality of protective cylinders 41, two adjacent protective cylinders 41 are fixedly connected through a flange, and a sleeve 61 is fixedly connected with the bottoms of the protective cylinders 41 positioned at the lower ends through bolts. The number of the pile casings 41 can be adjusted according to the depths of different drilled wells or pile holes through the spliced straight-barrel structure, so that the bottoms of the straight barrels 4 can be lowered to the position where a drill bit is disconnected in the drilled well.

A positioning device 6 is fixed on the inner side of the bottom of the straight cylinder 4, the positioning device 6 comprises a sleeve 61 with a hollow cylindrical structure and four connecting blocks 62 symmetrically distributed at the bottom of the sleeve 61, the middle of each connecting block 62 defines a circular positioning area for the end of the drill bit 7 to pass through, a gap is formed between every two adjacent connecting blocks 62, and an arc-shaped limiting block 63 is installed at the top of the gap; the arc stopper 63 surface sets up the arc surface of semicircle post, can not persist mud through line contact between it and the four otic placodes on the drill bit 7, when positioner 6 lies in the alignment of otic placode on the drill bit 7, owing to adopted four connecting blocks 62, consequently only need with positioner 6 with the range rotation that does not exceed 90 alright with the space that can make between otic placode and two connecting blocks 62 aim at, concrete turned angle is according to the otic placode quantity decision on the drill bit in the reality, the otic placode of drill bit is 3 usually, 4, 6, the turned angle that corresponds respectively can be 120 °, 90 °, 60.

In order to facilitate the straight cylinder to descend in a drilling well, an installation ring 6101 is fixedly sleeved on the outer side of the sleeve 61, a plurality of centralizing wheels 6102 are installed on the installation ring 6101 in a central symmetry manner, the centralizing wheels 6102 are in contact with a well wall, the rolling direction of the centralizing wheels is parallel to the axis of the sleeve 61, in the descending process of the straight cylinder, the centralizing wheels 402 can play a role in auxiliary positioning until a gap between two adjacent connecting blocks 62 is clamped on an ear plate of the drill bit 7, a contact switch 6301 is arranged on the arc limiting block 63, when the arc limiting block 63 is in contact with the ear plate on the drill bit 7, the straight cylinder 4 is lowered to a designated position, and the sleeve 61 is just sleeved on the drill bit 7, so that the hydraulic pumps 102 are respectively started front and back, and hydraulic oil is respectively input into the first output hydraulic pipe 51.

Referring to fig. 11-13, one end of any one of the connecting blocks 62 is horizontally provided with a shaft sleeve sliding cavity 6201 with an opening on the outer side, the other end is provided with a pin shaft mounting hole 6202, a shaft sleeve 64 capable of movably extending is inserted into the shaft sleeve sliding cavity 6201, the outer end of the shaft sleeve 64 penetrates through the opening and extends towards the other adjacent connecting block 62, the shaft sleeve 64 corresponds to the pin shaft mounting groove 6202 on the side of the other connecting block 62, and a fixing plate 6203 is mounted in the pin shaft mounting groove 6202;

an inner piston block 6401 and an outer piston block 6402 are respectively fixedly connected to the shaft sleeve 64 in the shaft sleeve sliding cavity 6201, the inner piston block 6401 and the outer piston block 6402 are in sliding fit with the inside of the shaft sleeve sliding cavity 6201, and the top parts of the two sides of the shaft sleeve sliding cavity 6201 are respectively communicated with a first output hydraulic pipe 51 and a second output hydraulic pipe 52;

the first output hydraulic pipe 51 and the second output hydraulic pipe 52 respectively and alternately inject hydraulic oil into the shaft sleeve sliding cavity 6201, and push the shaft sleeve 64 to slide in the shaft sleeve sliding cavity 6201;

a plurality of ropes 65 are further mounted inside the sleeve 61, the outer ends of the ropes 65 are fixedly connected with pin shafts 6501, and the pin shafts 6501 penetrate through the fixing plate 6203 and are movably clamped on the shaft sleeves 64.

The top of the sleeve 61 is provided with a plurality of hangers 6103, the hangers 6103 are rotatably provided with rotating shafts, the rotating shafts are fixedly wound with ropes 65, the end parts of the rotating shafts are provided with handles 6103a, the number of the ropes 65 is consistent with the number of the connecting blocks 62, and the ropes 65 can be wound on the rotating shafts when the positioning device 6 is not needed to be used.

A plurality of grooves are symmetrically and concavely arranged on the pin shaft 6501 at the outer end part of the rope 65, a limiting block 6502 is clamped in the grooves in a sliding manner, the limiting block 6502 is fixedly connected with the bottom of the groove through a spring 6503, the outer end of the limiting block 6502 is of an inclined plane structure, and the inclined plane faces the tail end of the pin shaft 6501;

a pin hole 6203a is arranged on the fixing plate 6203 corresponding to the pin shaft 6501, and the pin shaft 6501 is clamped and passes through the pin hole 6203 a.

The outer end portion of the shaft sleeve 64 is provided with a hollow cylindrical limiting pin sleeve 6403, a pin opening 6403a with the diameter consistent with that of the pin shaft 6501 is formed in the limiting pin sleeve 6403, a through groove 6403b for extending the limiting block 6502 is formed in the side wall of the limiting pin sleeve 6403, when the limiting pin sleeve 6403 is sleeved on the pin shaft 6501, the limiting block 6502 extends out of the through groove 6403b, and the limiting block 6502 is pressed when the pin shaft 6501 is detached.

Referring to fig. 1-8, a first output hydraulic pipe 51 and a second output hydraulic pipe 52 are connected to any one of the pin shaft sliding cavities 6201, all the first output hydraulic pipes 51 extend above the casing 41 and are simultaneously connected to the bottom of the first pipe joint 35, and the top of the first pipe joint 35 is connected to the first hydraulic pipe 104; all the second output hydraulic pipes 52 also extend to the upper part of the casing 41 and simultaneously communicate with the bottom of the second pipe joint 36, the top of the second pipe joint 36 communicates with the second hydraulic pipe 105, and the first pipe joint 35 and the second pipe joint 36 are coaxially mounted on the top of the casing 41. A plurality of annular rings are distributed on the inner wall of the protecting cylinder 41 along the extending direction of the hydraulic pipes, the calibers of the annular rings are larger than the diameters of the first output hydraulic pipe 51 and the second output hydraulic pipe 52, the first output hydraulic pipe 51 and the second output hydraulic pipe 52 penetrate through the corresponding annular rings to extend towards the top of the protecting cylinder 41, the lengths of the first output hydraulic pipe 51 and the second output hydraulic pipe 52 are slightly larger than the length of the whole straight cylinder 4, and when the straight cylinder 4 rotates within the range of 90 degrees left and right, the first output hydraulic pipe 51 and the second output hydraulic pipe 52 cannot be wound in the straight cylinder 4.

First pipe joint 35 and second pipe joint 36 are fixed hoist and mount at power drive platform 3 internal top, and when straight section of thick bamboo 4 rotated, first pipe joint 35 and second pipe joint 36 can not follow the rotation, consequently the length of first output hydraulic pressure pipe 51 and second output hydraulic pressure pipe 52 can be longer than straight section of thick bamboo 4 length slightly for when straight section of thick bamboo 4 small amplitude rotated, first output hydraulic pressure pipe 51 and second output hydraulic pressure pipe 52 had sufficient length and keeps communicating with first pipe joint 35 and second pipe joint 36.

The first hydraulic pipe 104 and the second hydraulic pipe 105 are respectively connected with two output ends of the electromagnetic directional valve 103, the input end of the electromagnetic directional valve 103 is communicated with the hydraulic pump 102, and the input end of the hydraulic pump 102 is communicated with the hydraulic tank 101 filled with hydraulic oil.

Referring to fig. 1-2, the invention also provides a fishing device of the rotary drilling bit, which comprises a locomotive 1 and an upright post 2 of a hoisting positioning mechanism, wherein the bottom of the upright post 2 is hinged with the outer end of an installation platform on the locomotive 1; the middle part of the upright post 2 is hinged with one end of an inclined support hydraulic cylinder 201, and the other end of the inclined support hydraulic cylinder 201 is hinged and installed on an installation platform of the locomotive 1;

the top of the upright post 2 is fixedly provided with a horizontal hanger 202 which is horizontally arranged, one end of the horizontal hanger 202 is provided with a top pulley 203, the other end of the horizontal hanger 202 is provided with a traction mechanism, one end of a steel cable 205 passes through the top pulley 203 and the traction mechanism and is fixedly connected with a counterweight pulley block 204, and the other end of the steel cable 205 is fixedly connected with a pulley 302 at the top of the power driving platform 3.

The power driving platform 3 is hoisted on the upright post 2 through a steel cable, the power driving platform 3 comprises a cylindrical platform 31 with an opening at the bottom, a sliding claw 301 is fixedly arranged on one side of the cylindrical platform 31, and the sliding claw 301 is clamped on a guide slide rail 206 on the surface of the upright post 2 in a tile holding manner;

the bottom of the cylindrical platform 31 is fixedly connected with the inner ring of the external tooth slewing bearing 32, the outer ring of the external tooth slewing bearing 32 is fixedly connected with the top of the straight cylinder through a bolt, the cylindrical platform 31 extends outwards to form an installation plate 3101, a gear 33 driven by a motor 34 is rotatably installed on the installation plate 3101, and the gear 33 is meshed with the outer ring of the external tooth slewing bearing 32.

A fishing method of a rotary drilling bit adopts the fishing device, and comprises the following specific steps:

s1: the inclined supporting hydraulic cylinder 201 is controlled to finely adjust the position of the upright post 2, so that the straight cylinder 4 is positioned above the drilled well, the rope 65 is pulled out from the rotating shaft, and a pin shaft 6501 at the tail end of the rope passes through a pin hole 6203a on the fixing plate 6203 and is clamped on the outer end surface of the fixing plate 6203;

s2: lowering the wireline 205 through a conventional hoisting mechanism so that the vertical column 4 enters the borehole;

s3: when the straight cylinder 4 is lowered to meet a resistance, the power driving platform 3 drives the straight cylinder to rotate in the well in a positive and negative direction at an angle not exceeding 90 degrees in a small range until the straight cylinder is lowered to the bottommost end and is sleeved at the end part of the drill bit, so that a gap between the two connecting blocks 62 is positioned on an ear plate of the drill bit 7;

s4: starting the hydraulic pump 102 to inject hydraulic oil into the first hydraulic pipes 104, uniformly dispersing the hydraulic oil into each first output hydraulic pipe 51 through the first pipeline joint 35, pushing the sleeve shaft 64 to extend outwards, and enabling the outer end of the sleeve shaft 64 to penetrate through the lug plate hole 701 on the drill bit 7 in the extending process, so that the pin sleeve 6403 at the end part of the sleeve shaft 64 is sleeved on the pin shaft 6501;

s5: then, oil is injected into the second hydraulic pipe 105 through the electromagnetic directional valve 103, so that the sleeve shaft 64 is contracted into the pin shaft sliding cavity 602, and the rope 65 passes through the ear plate hole 701 of the drill bit 7, thereby completing the fixation of the rope positioning mechanism and the drill bit 7;

s6: the wire rope 205 is pulled up by the traction mechanism, pulling out the straight cylinder 4 together with the fixed drill bit 7.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.