CN219795189U - Drill rod pulling device - Google Patents

Abstract

The utility model discloses a drill rod extractor, which comprises an extractor body and a mud removing mechanism arranged on the extractor body and used for cleaning mud adhered to a drill rod, wherein the extractor body comprises a base, a plurality of hydraulic telescopic rods arranged on the base, an installation table arranged at the upper ends of the hydraulic telescopic rods and a grabbing component arranged on the installation table and used for grabbing the drill rod; the lower end of the drill rod is inserted into soil, and the upper end of the drill rod sequentially and movably passes through the base, the mud removing mechanism, the platform and the grabbing component from bottom to top and is clamped by the grabbing component; according to the utility model, the mud removing mechanism is added on the existing hydraulic extractor, when the extractor body extracts the drill rod, the mud removing mechanism can automatically clean soil outside the drill rod so as to keep the drill rod clean and not influence the next drilling, and meanwhile, the mud removing mechanism is divided into two stages of dry cleaning and wet cleaning, so that the cleaning is more thorough.

Description

Drill rod pulling device

Technical Field

The utility model relates to the technical field of drilling equipment, in particular to a drill rod pulling-out device.

Background

In engineering geological exploration, a certain number of sample objects are taken from a certain depth in a drill hole according to the technical requirements of exploration or engineering design construction, which is a main task of engineering geological exploration, is a main means for acquiring subsurface geological data through engineering geological exploration and hydrogeological exploration, and is an important method for checking the construction quality of underground engineering such as building foundation and the like; the drilling is formed by driving the drill rod into the stratum by a worker and then pulling out the drill rod, and the drill rod is pulled out mainly by using a drill rod puller because the friction force between the drill rod and the stratum is large; the existing drill rod extractor is simple in structure and only has the function of extracting the drill rod, and the drill rod is usually attached with a lot of soil after drilling, if the drill rod is not cleaned in time, the next drilling can be carried out, the soil of the previous time can be mixed into the drilling of the next time, and the follow-up sampling precision is affected.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: the utility model provides a drilling rod extractor has increased the desilting mechanism on prior art, when the extractor body pulls up the drilling rod, damping mechanism just automatic clear up the outside earth of drilling rod, thereby keep the drilling rod clean and do not influence the drilling rod next time.

In order to solve the technical problems, the utility model adopts a technical scheme that: the drill rod extractor comprises an extractor body and a mud removing mechanism which is arranged on the extractor body and used for cleaning mud stained by a drill rod, wherein the extractor body comprises a base, a plurality of hydraulic telescopic rods arranged on the base, a mounting table arranged at the upper ends of the hydraulic telescopic rods and a grabbing component which is arranged on the mounting table and used for grabbing the drill rod; the lower end of the drill rod is inserted into soil, and the upper end of the drill rod sequentially penetrates through the base, the mud removing mechanism, the platform and the grabbing component from bottom to top and is clamped by the grabbing component.

Further, the mud removing mechanism comprises a mud blocking unit, the mud blocking unit comprises a mud blocking ring coaxially arranged below the grabbing component, and the inner diameter of the mud blocking ring is matched with the outer diameter of the drill rod so as to scrape mud attached to the periphery of the drill rod in the ascending process of the drill rod.

Further, the mud removing mechanism further comprises a mud cleaning unit, and the mud cleaning unit comprises a mud cleaning ring coaxially arranged between the mud blocking ring and the grabbing component, a mud cleaning piece arranged on the inner wall of the mud cleaning ring and a driving component used for driving the mud cleaning ring to rotate around the axis of the mud cleaning ring, wherein the mud cleaning ring drives the mud cleaning piece to rotate so as to further clean mud on the periphery of the drill rod in the ascending process of the drill rod.

Further, the mud cleaning unit further comprises a water storage tank arranged on the annular wall of the mud cleaning ring, the water storage tank penetrates through the upper end face of the annular wall upwards along the vertical direction, the water storage tank divides the annular wall into an inner annular wall and an outer annular wall, the tank bottom wall of the water storage tank is used as a connecting part of the inner annular wall and the outer annular wall, and the mud cleaning piece is arranged on the inner circumferential surface of the inner annular wall in a surrounding manner; the inner annular wall is provided with a plurality of water outlets, and the water outlets penetrate through the inner annular wall along the radial direction so that a water source in the water storage tank flows into the mud cleaning piece to wet the mud cleaning piece.

Further, the mud cleaning unit further comprises a water injection pipe and a water outlet pipe, wherein the water injection pipe is used for injecting water into the water storage tank, one end of the water injection pipe is communicated with the water outlet pipe, the other end of the water injection pipe is communicated with an external water source, the water outlet end of the water outlet pipe is located above the water storage tank, and on a horizontal projection plane, the water outlet end of the water outlet pipe is overlapped on the water storage tank.

Further, the mud cleaning unit further comprises a supporting plate and a limiting assembly arranged on the supporting plate and used for vertically limiting the mud cleaning ring, the limiting assembly comprises a limiting ring arranged on the supporting plate and coaxially arranged with the mud cleaning ring, a limiting ring groove is concavely arranged on the outer peripheral surface of the mud cleaning ring at the position corresponding to the limiting ring inwards, and the limiting ring groove is in concave-convex fit with the limiting ring and can rotate relative to the limiting ring.

Further, the upper end and the lower end of the limiting ring are respectively provided with an upper clamping groove and a lower clamping groove which are distributed along the circumferential direction of the limiting ring, and the upper clamping groove and the lower clamping groove respectively penetrate through the upper end face and the lower end face of the limiting ring along the vertical direction; the upper clamping groove and the lower clamping groove are internally provided with a plurality of balls, each ball is provided with a rolling part which is extruded out from the notch of the corresponding clamping groove, and the rolling parts are in rolling fit with the upper groove wall and the lower groove wall of the corresponding limiting groove.

Further, the limiting assembly further comprises a limiting projection which is annularly arranged on the outer peripheral surface of the limiting ring, and the height of the limiting projection is lower than that of the limiting ring, so that the outer peripheral surface of the limiting ring is provided with an upper limiting surface higher than the upper end surface of the limiting projection and a lower limiting surface lower than the lower end surface of the limiting projection; the upper groove wall of the limit groove is provided with an upper stop block which is formed by downward extension at the position corresponding to the upper limit surface, the lower groove wall of the limit groove is provided with a lower stop block which is formed by upward extension at the position corresponding to the lower limit surface, and the inner side surfaces of the upper stop block and the lower stop block are respectively blocked outside the upper limit surface and the lower limit surface so as to prevent the limit ring from being separated from the limit groove.

Further, a notch is formed on the front side and the rear side of the limiting ring respectively, the limiting ring is divided into an arc-shaped left clamping block and an arc-shaped right clamping block by the two notches, and the left clamping block and the right clamping block are respectively fixed on the front side surface of the supporting plate through L-shaped rods; the left clamping block and the right clamping block jointly enclose and limit the mud cleaning ring, and the mud cleaning ring can perform autorotation motion in the horizontal direction relative to the two clamping blocks under the drive of the driving assembly.

Further, the driving assembly comprises a power piece and a transmission gear used for transmitting the power of the power piece to the mud cleaning ring, an assembly groove is formed in the middle of the supporting plate and penetrates through the supporting plate forwards, the transmission gear is rotationally assembled in the assembly groove and can horizontally rotate around the axis of the transmission gear, the front side of the transmission gear extends out of the assembly groove, an outer tooth meshed with the transmission gear is arranged on the periphery of the mud cleaning ring, and the power piece is arranged at the upper end of the supporting plate, and an output shaft of the power piece downwardly extends into the assembly groove and is in transmission connection with the transmission gear.

The drill rod puller has at least the following beneficial effects: the mud removing mechanism is added on the existing hydraulic extractor, when the extractor body extracts the drill rod, the mud removing mechanism can automatically clean soil outside the drill rod so as to keep the drill rod clean and not influence the next drilling, and meanwhile, the mud removing mechanism is divided into dry cleaning and wet cleaning two-stage cleaning, so that the cleaning is more thorough.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

FIG. 1 is a schematic view of an embodiment of a drill pipe extractor according to the present utility model;

FIG. 2 is a schematic cross-sectional view of the second support plate, drive gear, and purge ring of the drill string extractor of the present utility model;

FIG. 3 is a schematic illustration I of the construction of the second support plate, motor, and stop assembly of the drill pipe extractor of the present utility model;

FIG. 4 is a second schematic illustration of the structure of the second support plate, motor, and stop assembly of the drill pipe extractor of the present utility model;

FIG. 5 is a schematic view of the construction of the mud ring, external teeth, and ring blocks of the drill pipe extractor of the present utility model;

FIG. 6 is a schematic view of the partial structure at A in FIG. 3;

fig. 7 is a schematic view of a partial structure at B in fig. 4.

The meaning of the reference numerals in the drawings are:

the extractor comprises an extractor body 1, a base 11, a hydraulic telescopic rod 12, a platform 13, a grabbing component 14 and an arc-shaped groove 15;

the mud removing mechanism 2, the mud blocking unit 21, the first supporting plate 211, the mud blocking ring 212, the mud cleaning unit 22, the second supporting plate 221, the mud cleaning ring 222, the water storage tank 223, the inner annular wall 224, the outer annular wall 225, the annular sponge 226, the water outlet hole 227, the water injection pipe 228 and the water outlet pipe 229;

the driving assembly 3, the transmission gear 31, the assembly groove 32, the external teeth 33 and the motor 34;

the stopper assembly 4, the left clamp block 41, the upper left clamp slot 411, the first ball 412, the first rolling portion 413, the right clamp block 42, the lower right clamp slot 421, the fourth ball 422, the fourth rolling portion 423, the left stopper projection 43, the upper left stopper surface 431, the lower left stopper surface 432, the right stopper projection 44, the upper right stopper surface 441, the lower right stopper surface 442, the left L-shaped rod 45, the right L-shaped rod 46, the ring block 47, the stopper ring groove 471, the upper stopper 472, and the lower stopper 473.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Referring to fig. 1, the drill rod extractor of the present utility model includes an extractor body 1 for extracting a drill rod from a stratum and a mud removing mechanism 2 for cleaning mud adhered to the drill rod, wherein the extractor body 1 includes a base 11, a plurality of hydraulic telescopic rods 12 disposed on left and right sides of an upper end of the base 11, a platform 13 disposed on the upper ends of the hydraulic telescopic rods 12, and a grabbing component 14 disposed on the upper ends of the platform 13 for grabbing the drill rod, and the extractor body 1 is similar to a hydraulic extractor in the prior art, so that redundant description thereof will not be repeated; in the illustrated embodiment, there are two hydraulic telescopic rods 12, and the mud removing mechanism 2 is provided at a position intermediate the two hydraulic telescopic rods 12; the platform 13 is provided with a perforation through which a drilling rod for drilling vertically passes, the perforation and the grabbing component 14 are coaxially arranged, an arc-shaped groove 15 is formed in the position of the base 11 corresponding to the drilling rod so as to give way to the drilling rod, the lower end of the drilling rod is inserted into soil, and the upper end of the drilling rod sequentially moves from bottom to top to pass through the base 11, the mud removing mechanism 2, the platform 13 and the grabbing component 14 and is clamped by the grabbing component 14.

The mud removing mechanism 2 comprises a mud blocking unit 21 which is closer to the base 11 and a mud cleaning unit 22 which is closer to the platform 13; the mud blocking unit 21 comprises a first supporting plate 211 and a mud blocking ring 212 fixedly arranged on the first supporting plate 211, the first supporting plate 211 is fixedly arranged between the two hydraulic telescopic rods 12, the mud blocking ring 212 is arranged in the middle of the front side of the first supporting plate 211 and coaxially arranged with the through holes, and the inner diameter of the mud blocking ring 212 is matched with the outer diameter of a drill rod so as to scrape mud attached to the periphery of the drill rod in the ascending process of the drill rod.

The mud cleaning unit 22 includes a second support plate 221, a mud cleaning ring 222 disposed in the middle of the front side of the second support plate 221, a mud cleaning member disposed on the inner wall of the mud cleaning ring 222, and a driving assembly 3 for driving the mud cleaning ring 222 to rotate around its own axis, where the mud cleaning ring 222 is disposed between the mud blocking ring 212 and the grabbing assembly 14 and is disposed coaxially with the mud blocking ring 212. The mud cleaning unit 22 further includes a water storage tank 223 disposed on the annular wall of the mud cleaning ring 222, the water storage tank 223 penetrates the upper end surface of the annular wall upward along the vertical direction and divides the annular wall into an inner annular wall 224 and an outer annular wall 225, the bottom wall of the water storage tank 223 is used as a connecting portion between the inner annular wall 224 and the outer annular wall 225, in the illustrated embodiment, the mud cleaning member is defined as an annular sponge 226, the annular sponge 226 is disposed around the inner circumferential surface of the inner annular wall 224, a plurality of water outlets 227 penetrating the inner annular wall 224 along the radial direction are disposed on the inner annular wall 224, the water outlets 227 are divided into a plurality of groups from top to bottom and uniformly distributed on the inner annular wall 224, each group of water outlets 227 are located on the same horizontal plane and uniformly distributed circumferentially with the center of the mud cleaning ring 222 as a center, and the diameters of the water outlets 227 of the groups of water outlets 227 are gradually decreased from top to bottom.

The mud cleaning unit 22 further comprises a water injection pipe 228 and a water outlet pipe 229, wherein the water injection pipe 228 is used for injecting water into the water storage tank 223, one end of the water injection pipe 228 is communicated with the water outlet pipe 229, the other end of the water injection pipe is communicated with an external water source, the water outlet end of the water outlet pipe 229 is located above the water storage tank 223, and on a horizontal projection plane, the water outlet end of the water outlet pipe 229 is overlapped on the water storage tank 223.

The mud cleaning unit 22 further comprises a limiting assembly 4 arranged on the second supporting plate 221 and used for vertically limiting the mud cleaning ring 222, and the limiting assembly 4 comprises a limiting ring arranged on the supporting plate and coaxially arranged with the mud cleaning ring 222 and a limiting protruding block arranged on the peripheral surface of the limiting ring in a surrounding manner; the front side and the rear side of the limiting ring are respectively provided with a notch, the limiting ring is divided into an arc-shaped left clamping block 41 and an arc-shaped right clamping block 42 by the two notches, the limiting protruding block is divided into an arc-shaped left limiting protruding block 43 and an arc-shaped right limiting protruding block 44, and the left clamping block 41 and the right clamping block 42 jointly enclose the mud cleaning ring 222 and limit the mud cleaning ring.

The left clamping block 41 is fixedly arranged on the front side surface of the second supporting plate 221 through a left L-shaped rod 45, and the height of the left limit bump 43 is lower than that of the left clamping block 41, so that the outer peripheral surface of the left clamping block 41 is provided with a left upper limit surface 431 higher than the upper end surface of the left limit bump 43 and a left lower limit surface 432 lower than the lower end surface of the left limit bump 43; the upper end and the lower end of the left clamping block 41 are respectively provided with an upper left clamping groove 411 and a lower left clamping groove which are profiled with the left clamping block 41 and distributed along the circumferential direction of the upper left clamping block, the upper left clamping groove 411 and the lower left clamping groove respectively penetrate through the upper end face and the lower end face of the left clamping block 41 along the vertical direction, a plurality of first balls 412 are arranged in the upper left clamping groove 411, each first ball 412 is provided with a first rolling part 413 which upwards protrudes from a notch of the upper left clamping groove 411, a plurality of second balls are arranged in the lower left clamping groove, and each second ball is provided with a second rolling part which downwards protrudes from the lower left notch.

The right clamping block 42 is fixedly arranged on the front side surface of the second supporting plate 221 through a right L-shaped rod 46, and the height of the right limit bump 44 is lower than that of the right clamping block 42, so that the outer peripheral surface of the right clamping block 42 is provided with a right upper limit surface 441 higher than the upper end surface of the right limit bump 44 and a right lower limit surface 442 lower than the lower end surface of the right limit bump 44; the upper end and the lower end of the right clamping block 42 are respectively provided with an upper right clamping groove and a lower right clamping groove 421 which are profiled with the right clamping block 42 and distributed along the circumferential direction of the upper right clamping block, the upper right clamping groove and the lower right clamping groove 421 respectively penetrate through the upper end face and the lower end face of the right clamping block 42 along the vertical direction, a plurality of third balls are arranged in the upper right clamping groove, each third ball is provided with a third rolling part which upwards emerges from the notch of the upper right clamping groove, a plurality of fourth balls 422 are arranged in the lower right clamping groove, and each fourth ball 422 is provided with a fourth rolling part which downwards emerges from the notch of the lower right clamping groove 421.

The outer peripheral surface of the mud cleaning ring 222 is provided with a ring block 47 protruding outwards at a position corresponding to the limit ring, a limit ring groove 471 is recessed inwards in the middle of the ring block 47, an upper stop block 472 extends downwards at a position corresponding to the upper limit surface on the upper groove wall of the limit ring groove 471, a lower stop block 473 extends upwards at a position corresponding to the lower limit surface on the lower groove wall of the limit ring groove 471, and inner side surfaces of the upper stop block 472 and the lower stop block 473 are blocked outside the upper limit surface and the lower limit surface respectively so as to prevent the limit ring from being separated from the limit ring groove 471. The upper groove wall of the limit groove 471 is in contact with the first rolling portion 413 and the third rolling portion 423 to be in rolling engagement therewith, and the lower groove wall of the limit groove 471 is in contact with the second rolling portion and the fourth rolling portion to be in rolling engagement therewith.

The driving assembly 3 comprises a power piece and a transmission gear 31 for transmitting the power of the power piece to the mud cleaning ring 222, an assembly groove 32 is formed in the middle of the second supporting plate 221, the assembly groove 32 penetrates through the second supporting plate 221 forwards, the transmission gear 31 is rotatably assembled in the assembly groove 32 and can horizontally rotate around the axis of the assembly groove, the front side of the transmission gear 31 extends out of the assembly groove 32, and external teeth 33 meshed and matched with the transmission gear 31 are arranged on the outer periphery of the mud cleaning ring 222; in the illustrated embodiment, the power member is defined as a motor 34, and the motor 34 is disposed at an upper end of the second support plate 221 and has an output shaft extending downward into the assembly groove 32 and in driving connection with a center of the driving gear 31.

The working mode of one embodiment of the drill rod puller of the utility model is as follows: the device is placed on the ground at a position corresponding to the drill rod, so that the drill rod sequentially passes through the mud blocking ring 212, the mud cleaning ring 222, the perforation and the grabbing component 14 from bottom to top, the water injection pipe 228 is connected with an external water source, the grabbing component 14 and the two hydraulic telescopic rods 12 are started, the grabbing component 14 grabs the drill rod, the two hydraulic telescopic rods 12 stretch to drive the platform 13 to ascend, and the grabbing component 14 is driven to extract the drill rod from the stratum.

In the process of pulling up the drill rod, the mud blocking ring 212 performs preliminary cleaning on the soil outside the drill rod, namely scraping the soil adhered to the outside of the drill rod; when the grabbing component 14 and the hydraulic telescopic rod 12 are started, the motor 34 and an external water source are started, the motor 34 drives the transmission gear 31 to rotate, the transmission gear 31 drives the mud cleaning ring 222 to rotate relative to the limiting component 4 through the external teeth 33, so that the annular sponge 226 is driven to wipe a drill rod, when the mud cleaning ring 222 rotates, the first ball 412, the second ball, the third ball and the fourth ball 422 enable rolling friction between the left clamping block 41, the right clamping block 42 and the mud cleaning ring 222 to be kept, friction force between the left clamping block 41, the right clamping block 42 and the mud cleaning ring 222 is reduced, rotation of the mud cleaning ring 222 is enabled to be more labor-saving, and abrasion of a device is reduced. Meanwhile, water from an external water source enters through the water injection pipe 228 and flows out from the water outlet pipe 229, the flowing water downwards enters into the water storage tank 223, water flows out from the lowest group of water outlet holes 227 while increasing in the water storage tank 223, and along with the continuous increase of water in the water storage tank 223, a plurality of groups of water outlet holes 227 permeate water into the annular sponge 226, as the water in the annular sponge 226 continuously permeates downwards, the diameter of the water outlet hole 227 which is higher is smaller, and the diameter of the water outlet hole 227 which is lower is smaller, so that the whole soaking of the annular sponge 226 is kept uniform, the condition that the upper water is less and the lower water is too much is avoided, and the cleaning force of the annular sponge 226 is improved.

Compared with the prior art, the drill rod puller is provided with the desilting mechanism, when the puller body pulls up the drill rod, the desilting mechanism can automatically clean soil outside the drill rod so as to keep the drill rod clean and not influence the next drilling, and meanwhile, the desilting mechanism is divided into two stages of dry cleaning and wet cleaning, so that the cleaning is more thorough.

Claims (10)

1. The utility model provides a drilling rod extractor, includes the extractor body and locates be used for the clean drilling rod to be stained with the mud removal mechanism of earth on the extractor body, its characterized in that: the extractor body comprises a base, a plurality of hydraulic telescopic rods arranged on the base, an installation table arranged at the upper ends of the hydraulic telescopic rods and a grabbing component arranged on the installation table and used for grabbing a drill rod, and the mud removing mechanism is arranged at the position in the middle of the hydraulic telescopic rods; the lower end of the drill rod is inserted into soil, and the upper end of the drill rod sequentially penetrates through the base, the desilting mechanism, the platform and the grabbing component from bottom to top and is clamped by the grabbing component.

2. The drill pipe extractor of claim 1, wherein: the mud removing mechanism comprises a mud blocking unit, the mud blocking unit comprises a mud blocking ring coaxially arranged below the grabbing component, and the inner diameter of the mud blocking ring is matched with the outer diameter of the drill rod so as to scrape mud attached to the periphery of the drill rod in the ascending process of the drill rod.

3. The drill pipe extractor of claim 2, wherein: the mud removing mechanism further comprises a mud removing unit, wherein the mud removing unit comprises a mud removing ring coaxially arranged between the mud blocking ring and the grabbing component, a mud removing piece arranged on the inner wall of the mud removing ring and a driving component used for driving the mud removing ring to rotate around the axis of the mud removing ring, and the mud removing ring drives the mud removing piece to rotate to further clean mud on the periphery of the drill rod in the ascending process of the drill rod.

4. A drill rod extractor according to claim 3, wherein: the mud cleaning unit further comprises a water storage tank arranged on the annular wall of the mud cleaning ring, the water storage tank penetrates through the upper end face of the annular wall upwards in the vertical direction, the water storage tank divides the annular wall into an inner annular wall and an outer annular wall, the tank bottom wall of the water storage tank is used as a connecting part of the inner annular wall and the outer annular wall, and the mud cleaning piece is arranged on the inner circumferential surface of the inner annular wall in a surrounding manner; the inner annular wall is provided with a plurality of water outlets, and the water outlets penetrate through the inner annular wall along the radial direction so that a water source in the water storage tank flows into the mud cleaning piece to wet the mud cleaning piece.

5. The drill pipe extractor of claim 4, wherein: the mud cleaning unit further comprises a water injection pipe and a water outlet pipe, wherein the water injection pipe is used for injecting water into the water storage tank, one end of the water injection pipe is communicated with the water outlet pipe, the other end of the water injection pipe is communicated with an external water source, the water outlet end of the water outlet pipe is located above the water storage tank, and the water outlet end of the water outlet pipe is overlapped on the water storage tank on a horizontal projection plane.

6. A drill rod extractor according to claim 3, wherein: the mud cleaning unit further comprises a supporting plate and a limiting assembly, wherein the limiting assembly is arranged on the supporting plate and used for vertically limiting the mud cleaning ring, the limiting assembly comprises a limiting ring which is arranged on the supporting plate and is coaxial with the mud cleaning ring, a limiting ring groove is concavely arranged on the outer circumferential surface of the mud cleaning ring at the position corresponding to the limiting ring inwards, and the limiting ring groove is in concave-convex fit with the limiting ring and can rotate relative to the limiting ring.

7. The drill pipe extractor of claim 6, wherein: the upper end and the lower end of the limiting ring are respectively provided with an upper clamping groove and a lower clamping groove which are distributed along the circumferential direction of the limiting ring, and the upper clamping groove and the lower clamping groove respectively penetrate through the upper end face and the lower end face of the limiting ring along the vertical direction; the upper clamping groove and the lower clamping groove are internally provided with a plurality of balls, each ball is provided with a rolling part which is extruded out from the notch of the corresponding clamping groove, and the rolling parts are in rolling fit with the upper groove wall and the lower groove wall of the corresponding limiting groove.

8. The drill pipe extractor of claim 6, wherein: the limiting assembly further comprises a limiting lug which is arranged on the outer peripheral surface of the limiting ring in a surrounding mode, and the height of the limiting lug is lower than that of the limiting ring, so that the outer peripheral surface of the limiting ring is provided with an upper limiting surface higher than the upper end surface of the limiting lug and a lower limiting surface lower than the lower end surface of the limiting lug; the upper groove wall of the limit groove is provided with an upper stop block which is formed by downward extension at the position corresponding to the upper limit surface, the lower groove wall of the limit groove is provided with a lower stop block which is formed by upward extension at the position corresponding to the lower limit surface, and the inner side surfaces of the upper stop block and the lower stop block are respectively blocked outside the upper limit surface and the lower limit surface so as to prevent the limit ring from being separated from the limit groove.

9. The drill pipe extractor of claim 6, wherein: the front side and the rear side of the limiting ring are respectively provided with a notch, the limiting ring is divided into an arc-shaped left clamping block and an arc-shaped right clamping block by the two notches, and the left clamping block and the right clamping block are respectively fixed on the front side surface of the supporting plate through L-shaped rods; the left clamping block and the right clamping block jointly enclose and limit the mud cleaning ring, and the mud cleaning ring can perform autorotation motion in the horizontal direction relative to the two clamping blocks under the drive of the driving assembly.

10. The drill pipe extractor of any of claims 6 to 9, wherein: the driving assembly comprises a power piece and a transmission gear used for transmitting the power of the power piece to the mud cleaning ring, an assembly groove is formed in the middle of the supporting plate and penetrates through the supporting plate forwards, the transmission gear is rotationally assembled in the assembly groove and can do horizontal rotation motion around the axis of the transmission gear, the front side of the transmission gear extends out of the assembly groove, an outer tooth meshed with the transmission gear is arranged on the periphery of the mud cleaning ring, and the power piece is arranged at the upper end of the supporting plate, and an output shaft of the power piece extends downwards into the assembly groove and is in transmission connection with the transmission gear.