CN220551080U - Rotary cutting shield combined type drill rod thread loosening and tightening device - Google Patents

Abstract

The utility model discloses a rotary cutting shield combined type drill rod thread tightening device, which comprises a bottom plate, wherein a first clamp and a second clamp are arranged on the bottom plate, the first clamp and the second clamp are respectively provided with a coaxial right-opposite central through hole, the central through holes are used for penetrating and installing a drill rod, and the first clamp and the second clamp are used for clamping the drill rod in the corresponding central through holes; the first clamp is fixedly assembled on the bottom plate, the second clamp is rotatably assembled on the bottom plate, and the rotary driver is configured to drive the second clamp to rotate around the center line of the center through hole. The beneficial effects of the utility model are as follows: the combined drill rod splicing and detaching device is reasonable in structural design, the combined drill rod splicing and detaching device is used for assisting the drilling machine, and the central through hole can also play a role in guiding and supporting the drill rod during the operation of the drilling machine, so that the stability of the operation of the drill rod is improved.

Description

Rotary cutting shield combined type drill rod thread loosening and tightening device

Technical Field

The utility model belongs to the technical field of municipal pipeline trenchless construction, and particularly relates to a rotary cutting shield combined type drill rod thread loosening and tightening device.

Background

The non-excavation construction refers to that various rock-soil drilling equipment is utilized to directly replace or repair underground pipelines, so that traffic is not hindered, green lands and vegetation are not damaged. The technology has the advantages of small environmental impact, small occupied area, short construction period, small influence on traffic and the like, and is widely popularized and used at present.

The horizontal guide type top-pulling drilling equipment is one of common equipment for non-excavation construction, and the structure mainly comprises a drill rod and a drilling machine for driving the drill rod to move. The concrete construction process is as follows: after the drilling machine is lowered to the vertical repair well, the drilling machine drives the long drill rod to pre-drill a horizontal hole underground, the horizontal hole needs to extend into another adjacent repair well, then the other end (in the other repair well) of the long drill rod is connected with the reaming bit, and then the drilling machine drags the reaming bit back from the horizontal hole, so that the horizontal hole is enlarged to a required aperture, and then the non-excavation construction of the underground pipe network can be completed.

Because the underground space of the vertical overhaul well is limited, the long drill rod is adopted to construct underground, and the problem of difficult operation exists. Therefore, the applicant intends to design the long drill rod into a multi-section splicing structure, and the drill rod is increased section by section along with the increase of the drilling depth in the process of advancing the drill rod; and in the process of backing the drill rod, the drill rod is reduced section by section. In the development conception, two adjacent sections of drill rods are to be connected by threads, and the drive of a drilling machine is used for realizing threaded screwing. Due to the complex downhole construction environment, there are a number of instability factors that lend themselves to the rotational driving force of the drilling machine to twist the threads. Therefore, there is a need to design a device to assist the drilling machine in stably completing the assembly and disassembly of the drill pipe downhole.

Disclosure of Invention

In view of the above, the utility model provides a rotary cutting shield combined type drill rod thread tightening device, which aims to assist a drilling machine to complete splicing or dismounting of a drill rod.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the rotary cutting shield combined type drill rod thread tightening device is characterized by comprising a bottom plate, wherein a first clamp and a second clamp are arranged on the bottom plate, a coaxial right-opposite central through hole is formed in each of the first clamp and the second clamp, the central through holes are used for penetrating and installing a drill rod, and the first clamp and the second clamp are used for clamping the drill rod in the corresponding central through holes; the first clamp is fixedly assembled on the bottom plate, the second clamp is rotatably assembled on the bottom plate, and the rotary driver is configured to drive the second clamp to rotate around the center line of the center through hole.

Preferably, the second fixture comprises a second base body assembled on the bottom plate, the second base body is provided with a central through hole and an installation cavity circumferentially encircling the central through hole, one end of the central through hole is provided with assembly notches distributed along the circumferential array of the central through hole, second clamping blocks capable of radially sliding along the central through hole are installed in the assembly notches, a second piston capable of axially sliding along the central through hole is assembled in the installation cavity, and the second piston can be forced to radially reciprocate along the central through hole by reciprocating sliding.

Preferably, the second seat body comprises a second lantern ring, a third end plate and a fourth end plate, wherein the third end plate and the fourth end plate are fixed at two ends of the second lantern ring, the middle part of the third end plate is provided with a second sleeve extending into the second lantern ring, and the central through hole is surrounded by an inner space of the second sleeve.

Preferably, the first fixture comprises a first base fixedly assembled on the bottom plate, the first base is provided with a central through hole and an installation cavity circumferentially encircling the central through hole, one end of the central through hole is provided with an assembly notch distributed along the circumferential array of the central through hole, a first clamping block capable of radially sliding along the central through hole is installed in the assembly notch, a first piston capable of axially sliding along the central through hole is installed in the installation cavity, and the first piston can force the first clamping block to radially reciprocate along the central through hole through reciprocating sliding.

Preferably, the first piston is provided with a sliding groove corresponding to the assembly notch, the sliding groove is obliquely arranged relative to the central line of the central through hole, and the first clamping block is provided with a sliding block in sliding sleeve joint with the sliding groove.

Preferably, the first piston has an annular portion, and the space corresponding to two sides of the annular portion in the mounting chamber is provided with a first oil hole and a second oil hole respectively.

Preferably, small bumps distributed in an array are arranged on the inner side of the first clamping block.

Preferably, the first seat body comprises a first lantern ring, a first end plate and a second end plate, wherein the first end plate and the second end plate are fixed at two ends of the first lantern ring, a first sleeve extending into the first lantern ring is arranged in the middle of the first end plate, the central through hole is surrounded by an inner space of the first sleeve, a rectangular base is integrally formed at the lower part of the first lantern ring, and the rectangular base is fixedly arranged on the bottom plate.

The utility model has the beneficial effects that:

1. after the first clamp and the second clamp the two splicing sections of the combined drill rod at the same time, the rotary driver controls the first clamp to rotate, and then the thread pre-tightening force of the two splicing sections can be released. Then the second clamp releases the clamping force to the corresponding splicing section, and the drill rod is driven by the drilling machine to rotate, so that the rest threads can be rapidly withdrawn, and the disassembly work between the two splicing sections is completed.

2. After the two splicing sections of the combined drill rod are preliminarily butted, the first clamp clamps one splicing section, then the drilling machine drives the other splicing section to rotate, and therefore threaded connection work between the two splicing sections can be completed rapidly.

3. The thread tightening device is reasonable in structural design, not only assists the drilling machine to realize the splicing and disassembling work of the combined drill rod, but also enables the central through hole to play a role in guiding and supporting the drill rod during the work of the drilling machine, and improves the working stability of the drill rod.

Drawings

Fig. 1 is a schematic structural view of a rotary cutting shield trenchless apparatus composed of a drilling machine a, a combined drill rod 5 and a thread tightening device F;

FIG. 2 is a cross-sectional view of the trenchless apparatus of FIG. 1;

fig. 3 is a schematic view of the structure of the transmission section 5a in the composite drill rod 5;

fig. 4 is a schematic structural view of the hollow boss 6 d;

FIG. 5 is a schematic perspective view of a thread tensioner F;

FIG. 6 is a cross-sectional view of the thread take-up F;

FIG. 7 is an exploded view of the first clamp 2 in the thread take-up F;

fig. 8 is a sectional view of the first housing 2a in the first clamp 2;

fig. 9 is an exploded view showing the principle of the rotational assembly of the second jig 3;

FIG. 10 is an end view projection of the thread take-up F;

fig. 11 is a reference view showing a state of use of the trenchless apparatus in the downhole trenchless construction.

Detailed Description

The utility model is further described below with reference to examples and figures.

Please refer to the attached, 1, a rotary cutting shield non-excavation device composed of a drilling machine A, a combined drill rod 5 and a thread tightening device F. The following will explain the structures of the respective parts one by one.

The drilling machine a mainly relates to a flat bracket 6a, a base body 6b, a hydraulic cylinder 6c assembled on the base body 6b, a hollow shaft sleeve 6d and a driving device 7. The hollow shaft sleeve 6d is rotatably mounted inside the base body 6b, and the driving device 7 is used for driving the hollow shaft sleeve 6d to rotate. As can be seen from fig. 2, the modular drill rod 5 comprises a transmission section 5a and a number of splicing sections 5b, which are threaded in sequence. As can be seen from fig. 4, the inner hole wall of the hollow shaft sleeve 6d is provided with a strip-shaped raised strip 6d1 extending along the length direction, as can be seen from fig. 3, the outer surface of the transmission section 5a is provided with a strip-shaped groove 5a1 extending along the length direction, under the interaction of the strip-shaped groove 5a1 and the strip-shaped raised strip 6d1, the transmission section 5a is sleeved in the hollow shaft sleeve 6d in a sliding spline manner, based on the sliding spline, the driving device 7 drives the hollow shaft sleeve 6d to rotate, and the combined drill rod 5 can synchronously rotate along with the hollow shaft sleeve 6d, so that the rotary motion of drilling is realized.

Further, referring to fig. 1, a base 6b is slidably assembled on a flat bracket 6a, hydraulic cylinders 6c are symmetrically arranged on two sides of the base 6b, the hydraulic cylinders 6c include a cylinder body f fixed on the base 6b and a piston rod g with one end telescopically installed in the cylinder body f, a supporting disc 6a3 is arranged at the front part of the flat bracket 6a, and the outer ends of the piston rods g are fixedly supported on the supporting disc 6a 3. Limiting parts 5c are fixedly arranged at two ends of the transmission section 5a, and the limiting parts 5c are used for limiting the sliding range of the transmission section 5a in the hollow shaft sleeve 6 d. Based on the above, the piston rod g of the hydraulic cylinder 6c stretches and contracts, so that the base body 6b can be driven to slide back and forth relative to the flat bracket 6a, and in the process, when the base body 6b slides to be abutted with the limiting part 5c of the transmission section 5a, the combined drill rod 5 can slide synchronously along with the base body 6b, so that the axial feeding control of the drill rod is realized.

As shown in fig. 2, the transmission section 5a of the combined drill rod 5 is always located inside the hollow shaft sleeve 6d, and the total length of the drill rod is determined by the number of splicing sections 5b spliced at the front part of the transmission section 5 a. When the hydraulic cylinder 6c drives the transmission section 5a to feed forward to the limit position, the two splicing sections 5b are separated in a threaded manner, then the hydraulic cylinder 6c drives the drilling machine A to reset backward, and then one splicing section 5b is connected between the separated two splicing sections 5b again, so that the length expansion of the combined drill rod 5 can be realized. Conversely, the reverse operation can achieve a reduction in the spliced section 5b.

Referring to fig. 2 again, the screw thread tightening device F is installed at the front of the drilling machine a, and when the combined drill rod 5 increases or decreases the splicing section 5b, the screw thread tightening device F can assist the drilling machine a to complete connection and disassembly of the splicing section 5b. The method comprises the following steps:

as shown in fig. 5 and 6, the thread tightening device F includes a base plate 1, a first clamp 2 and a second clamp 3 are provided on the base plate 1, the first clamp 2 and the second clamp 3 are respectively provided with a central through hole a coaxially opposite to each other, the central through holes a are used for penetrating a splicing section 5b of a combined drill rod 5, and the first clamp 2 and the second clamp 3 are used for clamping the splicing section 5b in the corresponding central through holes a. The first clamp 2 is fixedly assembled on the base plate 1, the second clamp 3 is rotatably assembled on the base plate 1, and the second clamp 3 can rotate around the center line of the center through hole a. A rotary driver 4 is arranged on the base plate 1, and the rotary driver 4 drives the second clamp 3 to rotate. Referring to fig. 2, in particular application, the screw tightening device F is mounted at the front of the drill a, i.e. the base plate 1 is fixed at the front of the flat bracket 6 a.

The working principle of the thread tightening device F for realizing the separation of the two splicing sections 5b is as follows: in an initial state, the first clamp 2 and the second clamp 3 respectively clamp one splicing section 5b, then the rotary driver 4 drives the second clamp 3 to rotate, and the splicing section 5b at the left end can be driven to rotate relative to the splicing section 5b at the right end, so that the pretightening force of threaded connection is released, then the second clamp 3 releases the clamping force on the splicing section 5b at the left end, and then the drilling machine A drives the transmission section 5a to rotate, so that the rest threads can be rapidly withdrawn, and the separation between the two splicing sections 5b is realized. The sectional disassembly of the combined drill rod 5 is carried out by means of the thread tightening device F, so that the loose designated splicing section 5b can be ensured. Referring to fig. 11, because the combined drill rod 5 involves multiple threaded connections, the combined drill rod is completely disassembled by the drilling machine a, the unscrewed position is not in the manhole B, and a new splicing section 5B cannot be added. And the corresponding pretightening force is removed through the rotary driver 4, so that the problems can be effectively avoided.

The working principle of the thread tightening device F for realizing the connection of the two splicing sections 5b is as follows: after the two splicing sections 5b are preliminarily butted, the second clamp 3 clamps the splicing section 5b at the right end, the drilling machine A drives the splicing section 5b at the left end to rotate, and then the two splicing sections 5b can be installed quickly.

In this embodiment, the specific structure of the first clamp 2 for achieving clamping is as follows:

referring to fig. 6, the first fixture 2 includes a first base 2a fixedly assembled on the base plate 1, and referring to fig. 8, a central through hole a is formed in the middle of the first base 2a, a mounting cavity b circumferentially surrounding the central through hole a is further provided in the first base 2a, an assembly notch c circumferentially arrayed along the central through hole a is provided at one end of the central through hole a, a first clamping block 2b capable of sliding radially along the central through hole a is installed in the assembly notch c, and a first piston 2c capable of sliding axially along the central through hole a is installed in the mounting cavity b. As can be seen from fig. 7, the position of the first piston 2c close to the first clamping block 2b is provided with a sliding connection groove 2c1, the sliding connection groove 2c1 is obliquely arranged relative to the center line of the central through hole a, and the first clamping block 2b is provided with a sliding connection block 2b1 in sliding sleeve connection with the sliding connection groove 2c 1. As can be seen from fig. 6, the first piston 2c has an annular portion 2c2, and the space corresponding to the two sides of the annular portion 2c2 in the mounting chamber b is provided with a first oil hole d and a second oil hole e, respectively.

Based on the above structural arrangement, the hydraulic oil is injected into the second oil hole e, so that the first piston 2c can be pushed to slide leftwards, and then the first clamping block 2b moves inwards along the radial direction of the central through hole a under the guiding action of the sliding connection groove 2c1 and the sliding connection block 2b1, so that the drill rod is clamped. Otherwise, hydraulic oil is injected into the first oil hole d, so that the first piston 2c can be pushed to slide rightwards, and then the first clamping block 2b moves outwards along the radial direction of the central through hole a under the guiding action of the sliding connection groove 2c1 and the sliding connection block 2b1, so that the clamping force on the drill rod is relieved.

In this embodiment, in order to provide a better clamping effect, the first clamping blocks 2b have four groups, the circumferential arrays are distributed in the circumferential direction of the first seat body 2a, and further, the inner sides of the first clamping blocks 2b are all provided with small protruding blocks 2b2 distributed in an array.

As shown in fig. 8, for facilitating the assembly of the fixture, the first base 2a is of a combined structure, and is composed of a first collar 2a1, and a first end plate 2a2 and a second end plate 2a3 fixed at two ends of the first collar 2a1, wherein a first sleeve 2a4 extending into the first collar 2a1 is arranged in the middle of the first end plate 2a2, a central through hole a for penetrating a drill rod is surrounded by an inner space of the first sleeve 2a4, a rectangular base 2a11 is integrally formed at the lower part of the first collar 2a1, and the first fixture 2 is fixedly arranged on the bottom plate 1 through the rectangular base 2a 11.

Referring to fig. 6, in the present embodiment, the second clamp 3 relates to a second seat body 3a, a second clamping block 3b, a second piston 3c, and other components, and the working principle of implementing clamping is the same as that of the first clamp 2, and the detailed description thereof will not be repeated. Since the second clamp 3 is in a rotation assembly relationship with the base plate 1, there is a difference between the second seat 3a of the second clamp 3 and the first seat 2a of the first clamp 2, specifically as follows:

as shown in fig. 6 and 9, the second housing 3a includes a second collar 3a1, and a third end plate 3a2 and a fourth end plate 3a3 fixed to both ends of the second collar 3a1, the third end plate 3a2 has a second sleeve 3a4 extending into the second collar 3a1 at the middle thereof, and the central through hole a is defined by the inner space of the second sleeve 3a 4. The base plate 1 is provided with a collar seat 1a, the second collar 3a1 is of a circular structure, the second collar 3a1 is rotatably assembled in the collar seat 1a, the diameters of the third end plate 3a2 and the fourth end plate 3a3 are larger than those of the second collar 3a1, and after the assembly is completed, the third end plate 3a2 and the fourth end plate 3a3 are respectively positioned at two ends of the collar seat 1a and stably rotate and keep the second collar 3a1 in the collar seat 1 a. On the basis, the rotary driver 4 drives the third end plate 3a2 and the fourth end plate 3a3 to rotate, so that the rotation of the second clamp 3 can be realized.

As shown in fig. 10, a left hinging seat 1b and a right hinging seat 1c are symmetrically arranged at the lower part of a collar seat 1a, a rotary driver 4 consists of two groups of hydraulic cylinders, namely a first hydraulic cylinder 4a and a second hydraulic cylinder 4b, a piston rod of the first hydraulic cylinder 4a is hinged on the left hinging seat 1b, and a cylinder seat of the first hydraulic cylinder 4a is hinged at the left end parts of a third end plate 3a2 and a fourth end plate 3a 3; the piston rod of the second hydraulic cylinder 4b is hinged on the right hinging seat 1c, and the cylinder seat of the second hydraulic cylinder 4b is hinged on the right end parts of the third end plate 3a2 and the fourth end plate 3a 3. Based on this, when the piston rod of the first hydraulic cylinder 4a is extended outward, the piston rod of the second hydraulic cylinder 4b is contracted inward, and the second clamp 3 can be driven to rotate forward. On the contrary, when the piston rod of the second hydraulic cylinder 4b extends outwards, the piston rod of the first hydraulic cylinder 4a contracts inwards, so that the second clamp 3 can be driven to rotate reversely. In other words, the first hydraulic cylinder 4a and the second hydraulic cylinder 4b are simultaneously and alternately operated, so that the second clamp 3 can be driven to rotate relative to the collar seat 1a, thereby realizing the unloading of the screw pre-tightening force.

Further, for the cylinder seat of convenient rotation assembly pneumatic cylinder, third end plate 3a2 and fourth end plate 3a3 both ends all are equipped with left articulated ear g and right articulated ear h, and the cylinder seat of first pneumatic cylinder 4a articulates on the left articulated ear g of third end plate 3a2 and fourth end plate 3a 3. The cylinder base of the second hydraulic cylinder 4b is hinged on the right hinge ear h of the third 3a2 and fourth 3a3 end plates.

In the practical application process, when the spliced section 5b of the combined drill rod 5 is screwed and disassembled, the axial displacement exists in the drill rod, so that the distance between the limiting parts 5c at the two ends of the transmission section 5a is larger than the length of the whole base body 6b, and when the spliced section 5b is screwed and disassembled, the distance difference can ensure that the transmission section 5a slides in the hollow shaft sleeve 6d through the internal spline. Further, the bottom of the collar seat 1a is arranged on the bottom plate 1 through a sliding rail assembly h capable of moving at a small distance, and the purpose of the collar seat is to absorb axial displacement of the transmission section 5a within a small range when the rotary driver 4 unloads the screw pretightening force. Since this axial displacement is usually within 1mm, it can also be absorbed by self-deformation of the clamp.

In this embodiment, referring to fig. 2, the driving device 7 of the drilling machine includes a motor 7a and a horizontal transmission shaft 7c, an output shaft 7a1 of the motor 7a is arranged above the horizontal transmission shaft 7c along a vertical direction, the output shaft 7a1 is in power engagement with the horizontal transmission shaft 7c through a bevel gear set 7b, the horizontal transmission shaft 7c is arranged above a hollow shaft sleeve 6d in parallel, and the two are in power engagement through a cylindrical gear set 7 d. So design, drive arrangement 7 wholly installs in base member 6B framework 2B with vertical gesture, can adapt to with the degree of depth structure of manhole B, and then promotes the convenience of assembling. Further, the bevel gear set 7b and the cylindrical gear set 7d are both reduction transmission components, so that, considering this, a larger rotation torque can be provided for the combined drill rod 5, and the trenchless reaming efficiency and reliability are improved.

In the present embodiment, referring to fig. 1, the flat bracket 6a of the drill is configured as a rectangular frame 6a1 surrounded by four rectangular steels, the rectangular frame 6a1 is slidably fitted with a slide plate 6a2, and the base 6b is detachably mounted on the slide plate 6a2 by bolts. Four corners of the flat bracket 6a are provided with fixing seats 6a4. Referring to fig. 2, a transmission case 6b1 is vertically installed in a base 6b, a horizontal transmission shaft 7c, a bevel gear set 7b and a hollow shaft sleeve 6d are integrally assembled in the base 6b through the transmission case 6b1, and a motor 7a is fixed at the top of the transmission case 6b 1.

Finally, it should be noted that the above description is only a preferred embodiment of the present utility model, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (7)

1. The rotary cutting shield combined type drill rod thread tightening device is characterized by comprising a bottom plate (1), wherein a first clamp (2) and a second clamp (3) are arranged on the bottom plate (1), the first clamp (2) and the second clamp (3) are respectively provided with a coaxial right-opposite central through hole (a), the central through holes (a) are all used for penetrating and installing a drill rod, and the first clamp (2) and the second clamp (3) are all used for clamping the drill rod in the corresponding central through holes (a); the first clamp (2) is fixedly assembled on the bottom plate (1), the second clamp (3) is rotatably assembled on the bottom plate (1), and a rotary driver (4) is configured, and the rotary driver (4) is used for driving the second clamp (3) to rotate around the central line of the central through hole (a);

the first clamp (2) comprises a first base body (2 a) fixedly assembled on a bottom plate (1), the first base body (2 a) is provided with a central through hole (a) and an installation cavity (b) circumferentially encircling the central through hole (a), one end of the central through hole (a) is provided with an assembly notch (c) distributed along a circumferential array of the central through hole, a first clamping block (2 b) capable of radially sliding along the central through hole (a) is installed in the assembly notch (c), a first piston (2 c) capable of axially sliding along the central through hole (a) is assembled in the installation cavity (b), and the first piston (2 c) can force the first clamping block (2 b) to radially reciprocate along the central through hole (a).

2. The rotary-cut shield combined drill rod thread tightening device according to claim 1, wherein: the second clamp (3) comprises a second base body (3 a) assembled on the bottom plate (1), the second base body (3 a) is provided with a central through hole (a) and an installation cavity (b) circumferentially encircling the central through hole (a), one end of the central through hole (a) is provided with an assembly notch (c) distributed along a circumferential array of the central through hole, a second clamping block (3 b) capable of radially sliding along the central through hole (a) is installed in the assembly notch (c), a second piston (3 c) capable of axially sliding along the central through hole (a) is assembled in the installation cavity (b), and the second clamping block (3 b) can be forced to radially reciprocate along the central through hole (a) by the reciprocating sliding of the second piston (3 c).

3. The rotary-cut shield-combined drill rod thread tightening device according to claim 2, wherein: the second seat body (3 a) comprises a second lantern ring (3 a 1), and a third end plate (3 a 2) and a fourth end plate (3 a 3) which are fixed at two ends of the second lantern ring (3 a 1), wherein the middle part of the third end plate (3 a 2) is provided with a second sleeve (3 a 4) which stretches into the second lantern ring (3 a 1), and the central through hole (a) is surrounded by the inner space of the second sleeve (3 a 4).

4. The rotary-cut shield combined drill rod thread tightening device according to claim 1, wherein: the first piston (2 c) is provided with a sliding connection groove (2 c 1) at a position corresponding to the assembly notch (c), the sliding connection groove (2 c 1) is obliquely arranged relative to the central line of the central through hole (a), and the first clamping block (2 b) is provided with a sliding connection block (2 b 1) which is in sliding sleeve connection with the sliding connection groove (2 c 1).

5. The rotary-cut shield combined drill rod thread tightening device according to claim 1, wherein: the first piston (2 c) is provided with an annular part (2 c 2), and a first oil hole (d) and a second oil hole (e) are respectively arranged in the space of the installation cavity (b) corresponding to the two sides of the annular part (2 c 2).

6. The rotary-cut shield combined drill rod thread tightening device according to claim 1, wherein: the inner side of the first clamping block (2 b) is provided with small bumps (2 b 2) distributed in an array mode.

7. The rotary-cut shield combined drill rod thread tightening device according to claim 1, wherein: the first seat body (2 a) comprises a first lantern ring (2 a 1) and a first end plate (2 a 2) and a second end plate (2 a 3) which are fixed at two ends of the first lantern ring (2 a 1), a first sleeve (2 a 4) extending into the first lantern ring (2 a 1) is arranged in the middle of the first end plate (2 a 2), the central through hole (a) is formed by encircling an inner space of the first sleeve (2 a 4), a rectangular base (2 a 11) is integrally formed at the lower part of the first lantern ring (2 a 1), and the rectangular base (2 a 11) is fixedly arranged on the bottom plate (1).