CN214221075U

CN214221075U - Circular seam drilling tool

Info

Publication number: CN214221075U
Application number: CN202120022956.7U
Authority: CN
Inventors: 杨城茏
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-09-17
Anticipated expiration: 2031-01-06

Abstract

The utility model provides a circumferential weld drilling tool belongs to drilling tool technical field. It has solved the relatively poor problem of current circumferential weld drilling tool stability. This circumferential weld drilling tool, including the drill jig, locate the support section of thick bamboo on the drill jig and be used for driving the horizontal drive mechanism that supports a section of thick bamboo axial motion, be equipped with the brill section of thick bamboo by power component driven on the support section of thick bamboo, bore a section of thick bamboo and support the coaxial setting of section of thick bamboo, linked firmly the direction reference column that stretches into the brill section of thick bamboo on the drill jig, direction reference column and the coaxial setting of a section of thick bamboo that bores, be equipped with the stabilizer disc that is used for preventing a section of thick bamboo that bores from rocking on the direction reference column. When the drill cylinder moves axially, the drill cylinder is effectively supported through the stabilizing disc, the drill cylinder is prevented from shaking and deviating from the axial position, and the stability is good.

Description

Circular seam drilling tool

Technical Field

The utility model belongs to the technical field of the drilling tool, a circumferential weld drilling tool is related to.

Background

In the prior art, tunneling is a common means of non-blasting excavation of rocks, namely, a horizontal circular seam drilling machine is used for drilling circular seams on the tunnel face of the rocks to break the rock boundary, so that the rocks are favorably stripped. In the tunneling construction of the drilling machine, the head part of the drill cylinder of the circular seam drilling machine is provided with the drill teeth, and the tail part of the drill cylinder is provided with the driving shaft, so when a rock core is broken in the drill cylinder, the rock core can only be taken out from the head part of the drill cylinder, but the drill teeth at the head part of the drill cylinder clamp the rock core when the rock core is taken out, so that the rock core is difficult to take out, and certain construction troubles exist.

Therefore, the Chinese patent discloses a circular seam coring and drilling device with a water-passing spiral drill cylinder (application publication number is CN 112031687A), which comprises a drill bit seat, a first rotary motor, a rotary mandrel, a drill cylinder and a coring bit, wherein the drill cylinder is formed by spirally winding at least two pipelines, a down-the-hole bit is arranged in the drill cylinder, the front end of the down-the-hole bit can be abutted against a rock wall for positioning before drilling, and the problem that the drilling bit slips and is askew when drilling is started is avoided; when the drill cylinder retracts, the down-the-hole drill bit can break the drill cylinder and the inner core in the core bit completely and push the core bit out.

The circular seam coring and drilling device has the following problems: the drill cylinder is long, the front end of the drill cylinder can shake during drilling, so that the drill cylinder deviates from the axial position and is poor in stability; although the pre-drilling positioning can be performed by the down-the-hole drill bit, the positioning is an initial positioning, an accurate drilling position is found for the drill cylinder, and the purpose of supporting the drill cylinder is not achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a circumferential weld drilling tool for big moment of torsion, low rotational speed, the reinforcing is bored a section of thick bamboo and is around self axis pivoted stability.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a circumferential weld drilling tool, includes the drill jig, locates the support section of thick bamboo on the drill jig and is used for driving the horizontal drive mechanism who supports a section of thick bamboo axial motion, be equipped with the brill section of thick bamboo by power component driven on the support section of thick bamboo, bore a section of thick bamboo and the coaxial setting of a support section of thick bamboo, link firmly the direction reference column that stretches into the brill section of thick bamboo on the drill jig, direction reference column and the coaxial setting of a brill section of thick bamboo, be equipped with the stable dish that is used for preventing to bore a section of thick bamboo and rocks on the direction reference column.

Under the action of the power assembly, the drill cylinder rotates around the central axis of the drill cylinder; under the action of the horizontal driving mechanism, the supporting cylinder moves axially, so that the drilling cylinder is driven to move axially, and the drilling and withdrawing of the drilling cylinder are realized. When the drill cylinder moves axially, the drill cylinder is effectively supported through the stabilizing disc, the drill cylinder is prevented from shaking and deviating from the axial position, and the stability is good.

In the circular seam drilling tool, a shaft hole is formed in the guide positioning column, a drilling rod driven by a power unit coaxially penetrates through the shaft hole, a drill bit is arranged at the front end of the drilling rod, and an axial driving unit used for driving the drilling rod to move axially is arranged on the guide positioning column.

Under the action of the power unit, the drill rod rotates around the central axis of the drill rod; under the action of the axial driving unit, the drill rod moves axially. Before the drill cylinder drills, the axial driving unit drives the drill rod to move forwards, the power unit works to enable the drill bit to drill a positioning hole in the face, then the axial driving unit enables the drill rod to retreat, and finally the drill frame moves forwards integrally and positions the front end of the guide positioning column to the positioning hole. The front end of the guide positioning column extends out of the front end of the drill barrel for a distance and is used for being matched with the positioning hole. Through the locating hole, can improve the stability of direction reference column, and then improve the stability of stabilizing the dish, reach the purpose that improves a section of thick bamboo stability.

In the circular seam drilling tool, the outer diameter of the drill bit is larger than the aperture of the shaft hole but smaller than the outer diameter of the guide positioning column, the front end of the guide positioning column is provided with a guide conical surface, and the minimum outer diameter of the guide conical surface is smaller than the outer diameter of the drill bit.

Through the cooperation of the guide conical surface and the positioning hole, the guide positioning column can be firmly clamped, the guide positioning column is prevented from jumping in the radial direction, particularly the initial jumping of the drilling barrel when the drilling barrel is just contacted with the face is avoided, and the stability is further improved.

In the circular seam drilling tool, the rear end of the drilling barrel is coaxially and fixedly connected with a connecting barrel extending into the supporting barrel, a bearing is arranged between the connecting barrel and the supporting barrel, a sliding sleeve is in sliding fit with the guide positioning column, and the sliding sleeve is coaxially and fixedly connected with the connecting barrel.

The bearing can carry out axial and radial location to the connecting cylinder, guarantees to bore a section of thick bamboo coaxial with the support cylinder all the time. When supporting a section of thick bamboo axial motion, the direction reference column is fixed, can further prevent through the sliding sleeve that the direction reference column from rocking, and then prevents that the stabilizer disc from rocking to improve the stability of direction reference column. The stability of a supporting section of thick bamboo translation can further be improved again to direction reference column and sliding sleeve.

In above-mentioned circumferential weld drilling tool, the rear end of direction reference column links firmly flange, flange's rear is equipped with mounting flange, axial drive unit locates between flange and the mounting flange, power unit locates on the mounting flange, be equipped with between flange and the mounting flange and be used for preventing mounting flange circumferential direction's limit structure.

The guiding positioning column is connected with the drill frame through a connecting flange, and the mounting flange and the connecting flange are arranged oppositely. When the axial driving unit works, the mounting flange is driven to move, so that the power unit and the drill rod are driven to move axially; the drill rod penetrates through the mounting flange and is fixedly connected with the power unit, and the power unit drives the drill rod to rotate around the central axis of the power unit when working.

In the circular seam drilling tool, the limiting structure comprises at least one limiting column which is fixedly connected to the mounting flange and is parallel to the drill rod and limiting holes which are arranged on the connecting flange and correspond to the limiting columns in the same number one to one, and the limiting columns are arranged in the limiting holes corresponding to the limiting columns in a penetrating mode.

In the circular seam drilling tool, the limiting structure comprises at least one limiting column which is fixedly connected to the connecting flange and is parallel to the drill rod and limiting holes which are arranged on the mounting flange and correspond to the limiting columns in the same number one to one, and the limiting columns are arranged in the limiting holes corresponding to the limiting columns in a penetrating mode.

In the circular seam drilling tool, the axial driving unit is a hydraulic cylinder fixed on the guide positioning column, a piston rod of the hydraulic cylinder is parallel to the guide positioning column, and the piston rod of the hydraulic cylinder is fixedly connected with the mounting flange. The telescopic of the hydraulic cylinder piston rod can drive the mounting flange to move, thereby driving the drill rod to move axially.

In the circular seam drilling tool, the power assembly comprises a first motor fixed on the supporting barrel, a driving gear driven by the first motor and a driven gear coaxially and fixedly connected on the connecting barrel, and the driving gear is meshed with the driven gear.

The first motor is arranged outside the supporting cylinder, an opening is formed in the supporting cylinder, and the driving gear stretches into the opening and then is in transmission connection with the driven gear. When the first motor works, the driving gear is driven to rotate, the driven gear is driven to rotate in a meshed mode, and therefore the connecting cylinder and the drilling cylinder are driven to rotate around the central axis of the connecting cylinder and the drilling cylinder.

In the above circular seam drilling tool, the power unit is a second motor.

In the circular seam drilling tool, the periphery of the stabilizing disc is in sliding fit/clearance fit with the inner wall of the drilling barrel, and the stabilizing disc is provided with a plurality of slag outlets distributed in an annular array.

Compared with the prior art, the utility model has the advantages of it is following: the central stable structure is formed by the stable disc and the guide positioning column, so that the drill cylinder can be effectively prevented from shaking, and the drill cylinder cannot deviate from the axial position by being matched with a stabilizing mechanism of the drill frame, so that the stable coaxial rotation of the drill cylinder is effectively realized; under the matching of the guide conical surface and the positioning hole, the guide positioning column can be firmly clamped, the guide positioning column is prevented from jumping in the radial direction, and the stability is further improved; the drilling machine is suitable for drilling tools with low rotating speed and large torque, and the drilling barrel can stably enter a face; after drilling, the core can also be withstood to the direction reference column, makes things convenient for a brill section of thick bamboo to withdraw from in the circumferential weld.

Drawings

Fig. 1 is a schematic view of the drill rod and the guiding and positioning column provided by the present invention.

Fig. 2 is a cross-sectional view of the present invention in a first step of a circumferential seam drilling tool.

Fig. 3 is a cross-sectional view of the circular seam drilling tool of the present invention in a second step.

Fig. 4 is a cross-sectional view of the circular seam drilling tool of the present invention in a third step.

Fig. 5 is a cross-sectional view of the circumferential seam drilling tool of the present invention at the fourth step.

Fig. 6 is a sectional view of the circumferential seam drilling tool of the present invention in a sixth step.

Fig. 7 is a schematic view of the present invention showing the cooperation between the stabilizing disc and the guiding and positioning column.

In the figure, 1, supporting the cylinder; 2. drilling a barrel; 3. guiding the positioning column; 4. a stabilizing disc; 5. a shaft hole; 6. a drill stem; 7. a drill bit; 8. a guiding conical surface; 9. a connecting cylinder; 10. a bearing; 11. a sliding sleeve; 12. a connecting flange; 13. installing a flange; 14. a limiting column; 15. a hydraulic cylinder; 16. a first motor; 17. a driving gear; 18. a driven gear; 19. a second motor; 20. a slag outlet; 21. a support plate; 22. a reduction gearbox; 23. a palm surface; 24. positioning holes; 25. performing circular sewing; 26. and (5) a core.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

The circular seam drilling tool shown in fig. 2-6 comprises a drill frame, a support cylinder 1 arranged on the drill frame and a horizontal driving mechanism for driving the support cylinder 1 to move axially. The drill stand and the horizontal driving mechanism are not shown in the figures, the structure of the drill stand and the horizontal driving mechanism is the same as that of a back-slagging horizontal girth drilling tool (application number is CN202010288227.6) applied by the applicant at 14/4/2020, the improved part of the application is not arranged on the drill stand and the horizontal driving mechanism, and therefore the structure of the drill stand and the horizontal driving mechanism is not described in detail in the application.

As shown in fig. 2-6, a drill cylinder 2 driven by a power assembly is arranged on the support cylinder 1, the drill cylinder 2 is positioned in front of the support cylinder 1 and is coaxial with the support cylinder 1, the outer diameter of the drill cylinder 2 is equal to that of the support cylinder 1, and a cutting edge is arranged at the front end of the drill cylinder 2. In order to ensure slag tapping and cooling of the drill barrel 2, a flow passage and an air passage are arranged in the drill barrel 2, the structure of the flow passage and the air passage is the same as that of the flow passage and the air passage arranged in the drill barrel 2 under the CN202010288227.6 application number, and the flow passage and the air passage do not belong to the improvement part of the application, so that the detailed description is omitted.

Under the action of the power assembly, the drill cylinder 2 rotates around the central axis of the drill cylinder; under the action of the horizontal driving mechanism, the supporting cylinder 1 moves axially, so that the drilling cylinder 2 is driven to move axially, and the drilling and withdrawing of the drilling cylinder 2 are realized. When the drill cylinder 2 moves axially, the drill cylinder is effectively supported through the stabilizing disc 4, the drill cylinder 2 is prevented from shaking and deviating from the axial position, and the stability is good.

As shown in fig. 2-6, the drill stand has a vertically disposed support plate 21, and the support plate 21 has a guiding and positioning column 3, wherein the guiding and positioning column 3 extends into the drill barrel 2 and is disposed coaxially with the drill barrel 2. The rear end of the drilling cylinder 2 is coaxially and fixedly connected with a connecting cylinder 9 extending into the supporting cylinder 1, at least two bearings 10 are arranged between the connecting cylinder 9 and the supporting cylinder 1, a sliding sleeve 11 is in sliding fit on the guide positioning column 3, and the sliding sleeve 11 is coaxially and fixedly connected with the connecting cylinder 9. The connecting cylinder 9 is axially and radially positioned through the bearing 10, so that the drill cylinder 2 is always coaxial with the support cylinder 1. When supporting a 1 axial motion, direction reference column 3 is fixed, can further prevent through sliding sleeve 11 that direction reference column 3 from rocking, and then prevents that stabilizing disc 4 from rocking to improve the stability of direction reference column 3. The stability of a supporting cylinder 1 during translation can be further improved again to direction reference column 3 and sliding sleeve 11.

In this embodiment, the power assembly includes a first motor 16 fixed on the support cylinder 1, a driving gear 17 driven by the first motor 16, and a driven gear 18 coaxially connected to the connecting cylinder 9, and the driving gear 17 is engaged with the driven gear 18. The first motor 16 is arranged outside the support cylinder 1, a reduction box 22 is arranged between the first motor 16 and the driving gear 17, the reduction box 22 is fixed on the support cylinder 1, an opening is arranged on the support cylinder 1, and the driving gear 17 extends into the opening and then is in transmission connection with the driven gear 18. When the first motor 16 works, the driving gear 17 is driven to rotate, and the driven gear 18 is driven to rotate in a meshed mode, so that the connecting cylinder 9 and the drilling cylinder 2 are driven to rotate around the central axis of the connecting cylinder 9 and the drilling cylinder 2.

As shown in fig. 1, a shaft hole 5 is formed in the guiding positioning column 3, a drill rod 6 driven by a power unit coaxially penetrates through the shaft hole 5, a drill bit 7 is arranged at the front end of the drill rod 6, and an axial driving unit for driving the drill rod 6 to axially move is arranged on the guiding positioning column 3. In the middle of the drill rod 6 there are holes for ventilation and water passage for chip removal.

Under the action of the power unit, the drill rod 6 rotates around the central axis of the drill rod; under the action of the axial drive unit, the drill rod 6 is moved axially. Before the drill barrel 2 drills, the axial driving unit drives the drill rod 6 to move forwards, the power unit works to enable the drill bit 7 to drill a positioning hole 24 in the tunnel face 23, then the axial driving unit enables the drill rod 6 to retreat, and finally the drill frame integrally moves forwards and positions the front end of the guide positioning column 3 to the positioning hole 24. The front end of the guiding and positioning column 3 extends out of the front end of the drill barrel 2 for a distance and is used for being matched with the positioning hole 24. Through locating hole 24, can improve the stability of direction reference column 3, and then improve the stability of stabilizing disc 4, reach the purpose that improves the stability of boring a section of thick bamboo 2.

Specifically, as shown in fig. 1, the rear end of the guiding positioning column 3 is fixedly connected with a connecting flange 12, the guiding positioning column 3 is fixed to a supporting plate 21 through the connecting flange 12, a mounting flange 13 is arranged behind the connecting flange 12, an axial driving unit is arranged between the connecting flange 12 and the mounting flange 13, a power unit is arranged on the mounting flange 13, and a limiting structure used for preventing the mounting flange 13 from rotating circumferentially is arranged between the connecting flange 12 and the mounting flange 13. The guiding positioning column 3 is connected with the drill frame through a connecting flange 12, and a mounting flange 13 is arranged opposite to the connecting flange 12. When the axial driving unit works, the mounting flange 13 is driven to move, so that the power unit and the drill rod 6 are driven to move axially; the drill rod 6 penetrates through the mounting flange 13 and then is fixedly connected with the power unit, and the power unit drives the drill rod 6 to rotate around the central axis of the power unit when working.

As shown in fig. 1, the limiting structure includes at least one limiting post 14 fixedly connected to the mounting flange 13 and parallel to the drill rod 6, and limiting holes provided on the connecting flange 12 and corresponding to the limiting posts 14 in the same number one by one, wherein the limiting posts 14 are inserted into the limiting holes corresponding to the limiting posts 14. In this embodiment, the number of the limiting holes is four, and the number of the limiting columns 14 is also four, and the four limiting columns are respectively located at four corners of the mounting flange 13.

In some other embodiments, the limiting structure includes at least one limiting column 14 fixedly connected to the connecting flange 12 and parallel to the drill rod 6, and limiting holes provided on the mounting flange 13 in an equal number and one-to-one correspondence with the limiting columns 14, wherein the limiting columns 14 are inserted into the limiting holes provided in correspondence therewith.

As shown in fig. 1, the outer diameter of the drill 7 is larger than the bore diameter of the shaft hole 5, but smaller than the outer diameter of the guiding positioning column 3, the front end of the guiding positioning column 3 has a guiding conical surface 8, the maximum outer diameter of the guiding conical surface 8 is equal to the outer diameter of the guiding positioning column 3, the central axis of the guiding conical surface 8 is collinear with the central axis of the guiding positioning column 3, and the minimum outer diameter of the guiding conical surface 8 is smaller than the outer diameter of the drill 7. The guiding tapered surface 8 is fitted into the positioning hole 24 only when the distance from the front to the rear of the guiding tapered surface 8 into the positioning hole 24 exceeds 50% of the length of the guiding tapered surface 8. Through the cooperation of the guide conical surface 8 and the positioning hole 24, the guide positioning column 3 can be firmly clamped, the guide positioning column 3 is prevented from jumping in the radial direction, particularly the initial jumping of the drilling barrel 2 when just contacting with the face 23, and the stability is further improved.

In this embodiment, the axial drive unit is the pneumatic cylinder 15 of fixing on the direction reference column 3, and the piston rod of pneumatic cylinder 15 is parallel with direction reference column 3, and the piston rod of pneumatic cylinder 15 links firmly with mounting flange 13. The extension and contraction of the piston rod of the hydraulic cylinder 15 can drive the mounting flange 13 to move, so that the drill rod 6 is driven to move axially. In this embodiment, two hydraulic cylinders 15 are symmetrically arranged along the center line of the guiding positioning column 3.

Wherein the power unit is a second motor 19.

As shown in fig. 1-7, the guiding and positioning column 3 is provided with a stabilizing disc 4 for preventing the drill barrel 2 from shaking, the periphery of the stabilizing disc 4 is in sliding fit with the inner wall of the drill barrel 2, and as shown in fig. 7, the stabilizing disc 4 is provided with a plurality of slag outlets 20 distributed in an annular array.

In some other embodiments, the outer circumference of the stabilizer disc 4 is in clearance fit with the inner wall of the drill barrel 2, limiting the maximum oscillation amplitude of the drill barrel 2.

In this embodiment, the working process of the circular seam drilling tool is as follows:

first, as shown in fig. 2, the drill stand is abutted against the face 23;

secondly, as shown in fig. 3, the hydraulic cylinder 15 drives the piston rod to retract, so that the mounting flange 13 moves close to the connecting flange 12, meanwhile, the second motor 19 drives the drill rod 6 to rotate, and a positioning hole 24 is drilled on the tunnel face 23 through the drill bit 7;

thirdly, as shown in fig. 4, the second motor 19 stops working, the hydraulic cylinder 15 drives the piston rod to extend out, the mounting flange 13 is far away from the connecting flange 12, and the drill bit 7 is abutted to the front end of the guiding positioning column 3;

fourthly, as shown in fig. 5, the whole drill frame is moved forward, so that the guide conical surface 8 is matched with the positioning hole 24, the guide positioning column 3 is firmly clamped, and the guide positioning column 3 is prevented from jumping in the radial direction;

fifthly, the first motor 16 drives the driving gear 17 to rotate through the reduction box 22, the driving gear 17 drives the driven gear 18 to rotate, so that the drill cylinder 2 is driven to rotate around the central axis of the drill cylinder, and a circular seam 25 is machined on the tunnel face 23 of the drilled hole;

sixthly, as shown in fig. 6, the supporting cylinder 1 is retracted under the action of the horizontal driving mechanism, so that the drilling cylinder 2 is driven to withdraw from the annular gap 25, and in the withdrawing process, the guiding positioning column 3 is always abutted against the core 26, so that the core 26 is prevented from moving outwards along with the drilling cylinder 2.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a circumferential weld drilling tool, includes the drill jig, locates a support section of thick bamboo (1) on the drill jig and is used for the drive to support a horizontal drive mechanism of section of thick bamboo (1) axial motion, a serial communication port, be equipped with on a support section of thick bamboo (1) and bore a section of thick bamboo (2) by power component drive, bore a section of thick bamboo (2) and support the coaxial setting of a section of thick bamboo (1), link firmly guide reference column (3) that stretch into a section of thick bamboo (2) on the drill jig, guide reference column (3) and the coaxial setting of a section of thick bamboo (2), be equipped with on guide reference column (3) and be used for preventing to bore a stable dish (4) that a section of thick bamboo (2) rocked.

2. The circumferential weld drilling tool according to claim 1, characterized in that an axial hole (5) is formed in the guiding and positioning column (3), a drill rod (6) driven by a power unit coaxially penetrates through the axial hole (5), a drill bit (7) is arranged at the front end of the drill rod (6), and an axial driving unit for driving the drill rod (6) to axially move is arranged on the guiding and positioning column (3).

3. Circular seam drilling tool according to claim 2, characterized in that the outer diameter of the drill bit (7) is larger than the bore diameter of the shaft hole (5) but smaller than the outer diameter of the guiding and positioning post (3), the front end of the guiding and positioning post (3) has a guiding conical surface (8), and the smallest outer diameter of the guiding conical surface (8) is smaller than the outer diameter of the drill bit (7).

4. The circumferential weld drilling tool according to claim 1, characterized in that the rear end of the drilling barrel (2) is coaxially and fixedly connected with a connecting barrel (9) extending into the supporting barrel (1), a bearing (10) is arranged between the connecting barrel (9) and the supporting barrel (1), a sliding sleeve (11) is slidably matched on the guiding positioning column (3), and the sliding sleeve (11) is coaxially and fixedly connected with the connecting barrel (9).

5. The circumferential weld drilling tool according to claim 2, wherein the rear end of the guiding positioning column (3) is fixedly connected with a connecting flange (12), a mounting flange (13) is arranged behind the connecting flange (12), the axial driving unit is arranged between the connecting flange (12) and the mounting flange (13), the power unit is arranged on the mounting flange (13), and a limiting structure used for preventing the mounting flange (13) from rotating circumferentially is arranged between the connecting flange (12) and the mounting flange (13).

6. The circumferential weld drilling tool according to claim 5, wherein the limiting structure comprises at least one limiting column (14) which is fixedly connected to the mounting flange (13) and is parallel to the drill rod (6), and limiting holes which are arranged on the connecting flange (12), are equal in number to the limiting columns (14) and are arranged in a one-to-one correspondence manner, and the limiting columns (14) penetrate through the limiting holes which are arranged in a corresponding manner.

7. The circumferential weld drilling tool according to claim 5, characterized in that the axial driving unit is a hydraulic cylinder (15) fixed on the guiding and positioning column (3), a piston rod of the hydraulic cylinder (15) is parallel to the guiding and positioning column (3), and a piston rod of the hydraulic cylinder (15) is fixedly connected with the mounting flange (13).

8. A circumferential seam drilling tool according to claim 4, characterized in that the power assembly comprises a first motor (16) fixed to the support cylinder (1), a driving gear (17) driven by the first motor (16), and a driven gear (18) coaxially attached to the connecting cylinder (9), the driving gear (17) meshing with the driven gear (18).

9. A circumferential seam drill according to claim 2, characterized in that the power unit is a second motor (19).

10. Circumferential seam drilling tool according to claim 1, characterized in that the periphery of the stabilizing disc (4) is a sliding/clearance fit with the inner wall of the drill barrel (2), and that the stabilizing disc (4) has a number of slag outlets (20) distributed in an annular array.