CN113414605A - Quick-change drill bit device - Google Patents
Quick-change drill bit device Download PDFInfo
- Publication number
- CN113414605A CN113414605A CN202110767388.8A CN202110767388A CN113414605A CN 113414605 A CN113414605 A CN 113414605A CN 202110767388 A CN202110767388 A CN 202110767388A CN 113414605 A CN113414605 A CN 113414605A
- Authority
- CN
- China
- Prior art keywords
- transmission shaft
- drill bit
- outer sleeve
- quick
- fixture block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 82
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/12—Adapters for drills or chucks; Tapered sleeves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
The invention discloses a quick-change drill bit device which comprises a transmission shaft, a clamping block, an outer sleeve and an elastic piece, wherein a mounting groove of the transmission shaft is used for mounting a drill bit; the transmission shaft is provided with a mounting hole with a groove positioning surface inside, the fixture block is mounted in the mounting hole and is in contact with the groove positioning surface, and the part of the fixture block in contact with the drill bit is provided with a chamfer matched with the drill bit chamfer; the outer sleeve covers the fixture block, a space for the fixture block to move along the radial direction of the transmission shaft is reserved when the outer sleeve moves to a set position towards the rear end of the transmission shaft, and the fixture block is extruded when the outer sleeve moves to the set position towards the front end of the transmission shaft. The quick-change drill bit device aims to solve the problem that the operation is complicated due to the need of an external tool when a drill bit is changed.
Description
Technical Field
The invention belongs to the technical field of railway steel rail drilling, and particularly relates to a drill bit quick-changing device.
Background
A rail drilling machine is a machine tool special for drilling a railway rail. When the steel rail drilling machine rotates at a high speed by a gasoline engine, the torque of the steel rail drilling machine is transmitted to the reduction gearbox through the clutch, and the drill bit is mounted on an output shaft of the reduction gearbox and rotates at a rotating speed of 80-130 r/min. Meanwhile, the operating handle of the vibration feed mechanism drives the drill bit to feed or withdraw through a transmission system of the worm, the worm gear and the gear rack, and the drilling operation of the steel rail is completed.
Since the drilling target of the drilling machine is the steel rail, the drill bit of the drilling machine is worn greatly in the whole operation process, and the drilling machine needs to be replaced regularly. The existing domestic quick-change technology has complex structure, the bits are easy to clamp scrap iron when the bits are disassembled, the foreign quick-change technology needs to customize special matched bits, the customization cost is high, and an external tool is needed in the disassembling process.
In view of the above, it is desirable to provide a quick-change drill bit device for solving the above problems.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the operation is complicated due to the need of an external tool when the drill bit is replaced.
(II) technical scheme
The invention provides a quick-change drill bit device which comprises a transmission shaft, a clamping block, an outer sleeve and an elastic piece, wherein a mounting groove in the front end of the transmission shaft is used for mounting a drill bit, the outer sleeve is sleeved on the transmission shaft, the elastic piece is sleeved on the transmission shaft, the fixed end of the elastic piece is fixedly connected with the transmission shaft, and the elastic piece is compressed when the outer sleeve moves towards the rear end of the transmission shaft; the transmission shaft is provided with a mounting hole with a groove positioning surface inside, the fixture block is mounted in the mounting hole and is in contact with the groove positioning surface, and a chamfer matched with the drill bit chamfer is arranged at the position of the fixture block in contact with the drill bit; the overcoat covers the fixture block and when it moves to the settlement position towards the rear end of transmission shaft reserves the space that is used for the fixture block is followed the transmission shaft radially moves, and, works as the overcoat moves the front end of transmission shaft extrudees when moving to the settlement position the fixture block.
Further, the quick-change drill bit device further comprises a guide belt, the guide belt is arranged in a circle along the circumferential direction of the transmission shaft, and the outer sleeve moves along the transmission shaft through the guide belt.
Further, the quick-change drill bit device further comprises a spring seat, the spring seat is fixed on the transmission shaft, the elastic piece is a spring, and the fixed end of the elastic piece is connected with the spring seat.
Furthermore, a closed space is formed between the outer sleeve and the spring seat, and the elastic piece is arranged in the closed space.
Further, the quick-change drill bit device further comprises a clamp spring, wherein the clamp spring is arranged in a circle along the circumferential direction of the transmission shaft and used for axially limiting the spring seat.
Furthermore, a third chamfer is formed at the edge of the front end of the outer sleeve, which is in contact with the transmission shaft.
Further, the mounting hole is two, two the mounting hole is followed the axial symmetry of transmission shaft sets up and the contained angle between the two is 90.
Furthermore, the inner wall of the outer sleeve is in a step shape matched with the outer wall of the transmission shaft, and the distance between the inner wall surface of the front end of the outer sleeve and the axis of the transmission shaft is larger than the distance between the inner wall surface of the rear end of the outer sleeve and the axis of the transmission shaft.
Furthermore, the mounting hole is a square hole, and the surfaces of the peripheral outer walls of the fixture block are tangent to the surfaces of the peripheral inner walls of the mounting hole.
Furthermore, the chamfer comprises a first chamfer and a second chamfer, and the first chamfer and the second chamfer are respectively positioned at two ends of the fixture block.
Further, the first chamfer and/or the second chamfer is 30-60 °.
(III) advantageous effects
According to the quick-change drill bit device, when a drill bit is installed, the outer sleeve moves towards the rear end of the transmission shaft, the elastic piece is compressed, the clamping block is released to be in a state of being tightly attached to the groove positioning surface, the clamping block can move outwards freely, the drill bit can be inserted at the moment, the clamping block is forced to move outwards through the contact of the chamfer angle of the drill bit and the chamfer angle of the clamping block, when the drill bit is inserted to the bottom, the outer sleeve is loosened, the outer sleeve is reset by means of elastic strain force of the elastic piece, the clamping block is squeezed by the outer sleeve, and. Pulling out the drill bit is the opposite of installing the drill bit. Because the overcoat all moves towards the rear end of transmission shaft at installation and dismantlement in-process, and then has avoided the secondary contact with iron fillings, can effectively avoid iron fillings to get into inside the fixture block, need not be with the help of external instrument when changing the drill bit, overall structure is simpler.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an axial sectional view of a quick-change drill bit device provided by an embodiment of the invention;
fig. 2 is a radial cross-sectional view of a quick-change drill bit device provided by an embodiment of the invention.
In the figure:
1-a transmission shaft; 2-clamping blocks; 201-first chamfer; 202-second chamfer; 3, coating the outer sleeve; 301-third chamfer; 4-an elastic member; 5-a guide belt; 6-spring seat; 7-a clamp spring; 100-bit.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to the drill bit quick-change device provided by the embodiment of the invention, as shown in fig. 1-2, the drill bit quick-change device comprises a transmission shaft 1, a clamping block 2, an outer sleeve 3 and an elastic piece 4, wherein a mounting groove at the front end of the transmission shaft 1 is used for mounting a drill bit 100, the outer sleeve 3 is sleeved on the transmission shaft 1, the elastic piece 4 is sleeved on the transmission shaft 1, the fixed end of the elastic piece 4 is fixedly connected with the transmission shaft 1, and when the outer sleeve 3 moves towards the rear end of the transmission shaft 1, the elastic piece 4 is compressed;
the transmission shaft 1 is provided with a mounting hole with a groove positioning surface inside, the fixture block 2 is mounted in the mounting hole and is in contact with the groove positioning surface, and the part of the fixture block 2 in contact with the drill bit 100 is provided with a chamfer matched with the drill bit chamfer;
the outer sleeve 3 covers the fixture block 2 and reserves a space for the fixture block 2 to move along the radial direction of the transmission shaft 1 when the outer sleeve 3 moves to a set position towards the rear end of the transmission shaft 1, and the fixture block 2 is extruded when the outer sleeve 3 moves to the set position towards the front end of the transmission shaft 1.
In the above embodiment, when the drill bit 100 is installed, the outer sleeve 3 is dragged backwards along the transmission shaft 1 through the guide belt 5, the elastic piece 4 is compressed, the fixture block 2 is released from being tightly attached to the positioning surface of the transmission shaft, the fixture block 2 can move outwards freely, the drill bit 100 can be inserted at this time, and the fixture block 2 is forced to move outwards along the radial direction of the installation hole through the chamfering of the drill bit and the chamfering of the fixture block 2; when the drill bit 100 is inserted to the bottom, the outer sleeve 3 is loosened, the outer sleeve 3 is reset by means of the elastic member force of the elastic member 4, and at this time, the outer sleeve 3 presses the fixture block 2, so that the inner side of the fixture block 2 is combined with the plane of the drill bit 100. The manner in which the drill bit 100 is pulled out is the reverse of the manner in which the drill bit 100 is installed. Because the outer sleeve 3 moves towards the rear end of the transmission shaft 1 in the mounting and dismounting processes, secondary contact with scrap iron is avoided, and the phenomenon that the scrap iron generated in the process of drilling the steel rail enters the inside of the fixture block to block up and affect the replacement of the drill bit can be effectively avoided.
In some alternative embodiments, as shown in fig. 1, the quick-change drill device further comprises a guide strip 5, the guide strip 5 is arranged in a circle along the circumference of the transmission shaft 1, and the outer sleeve 3 moves along the transmission shaft 1 through the guide strip 5.
Specifically, overcoat 3 passes through guide band 5 and slides more easily on transmission shaft 1, can effectively reduce the driving force, and this simple structure, the maintenance cost is low. Wherein, the guide belt 5 can be made of rubber or PVC material with high surface smoothness.
In some alternative embodiments, as shown in fig. 1, the quick-change drill bit device further includes a spring seat 6, the spring seat 6 is fixed on the transmission shaft 1, the elastic member 4 is a spring, and the fixed end of the elastic member 4 is connected with the spring seat 6. Wherein the spring seat 6 is used for providing stable support and guide for the elastic member 4.
In some alternative embodiments, as shown in fig. 1, an enclosed space is formed between the outer sleeve 3 and the spring seat 6, and the elastic member 4 is provided in the enclosed space. Wherein, this enclosure space can ensure the iron fillings that produce and then the gap department of overcoat 3 and spring holder 6 in drilling process to influence the compression of elastic component 4.
Specifically, as shown in fig. 1, the right end (direction shown) of the outer sleeve 3 always overlaps with the spring seat 6 during movement. The overlap is greatest when the casing 3 is moved to the rightmost end; the overlap is minimal when the casing 3 is restored to the initial position.
In some optional embodiments, as shown in fig. 1, the quick-change drill bit device further includes a clamp spring 7, and the clamp spring 7 is arranged in a circle along the circumferential direction of the transmission shaft 1 and is used for axially limiting the spring seat 6. Wherein the circlip 7 provides an extreme position location for the spring seat 6.
In some alternative embodiments, as shown in fig. 1, a third chamfer 301 is formed at the edge of the front end of the outer sleeve 3 contacting the transmission shaft 1. The third chamfer 301 is mainly used for preventing iron chips from entering the mounting hole through the contact part of the front end of the outer sleeve 3 and the transmission shaft 1 to influence the radial movement of the fixture block 2 in the moving process of the outer sleeve 3.
In some alternative embodiments, as shown in fig. 2, there are two mounting holes, and the two mounting holes are symmetrically arranged along the axial direction of the transmission shaft 1 and have an included angle of 90 ° therebetween. This arrangement is intended to adapt to the structural characteristics of the borehole 100. Of course, the number of mounting holes and the external relationship are different according to different drilling structures.
In some alternative embodiments, as shown in fig. 1, the inner wall of the outer sleeve 3 is stepped to match the outer wall of the transmission shaft 1, and the distance between the inner wall surface of the front end of the outer sleeve 3 and the axis of the transmission shaft 1 is greater than the distance between the inner wall surface of the rear end of the outer sleeve 3 and the axis of the transmission shaft 1.
Specifically, the outer sleeve 3 is wrapped around the fixture block 2 in a conventional state, and the fixture block 2 is forced to be tightly attached to the groove positioning surface by using a stepped structure of the outer sleeve.
Of course, such structural features of the jacket 3 can satisfy:
when the outer sleeve 3 moves to a set position (namely a movement limit position) towards the rear end of the transmission shaft 1, a space for the fixture block 2 to move along the radial direction of the transmission shaft 1 is reserved; at the moment, the drill bit 100 can be inserted into the transmission shaft 1, and the fixture block 2 is forced to move outwards along the radial direction of the transmission shaft 2 through the contact of the chamfer angle of the drill bit and the chamfer angle of the fixture block 2;
when the outer sleeve 3 moves to a set position (i.e., a movement limit position) toward the front end of the drive shaft 1 under the driving of the elastic strain force of the elastic member 4, the fixture block 2 is pressed by the stepped inner wall surface to clamp the drill 100.
In some alternative embodiments, the mounting hole is a square hole, and the peripheral outer wall surface of the fixture block 2 is tangent to the peripheral inner wall surface of the mounting hole. The arrangement can meet the requirement that the fixture block 2 only moves along the radial direction of the transmission shaft 1 and does not move along the axial direction of the transmission shaft in the mounting hole. Because the chamfers of the fixture block 2 and the drill chamfers are not always in mutual contact if axial movement occurs, the drill 100 cannot be clamped finally, and the normal operation of the drilling machine is influenced.
In some optional embodiments, the chamfers include a first chamfer 201 and a second chamfer 202, and the first chamfer 201 and the second chamfer 202 are respectively located at two ends of the fixture block 2. When the drill bit 100 is installed, the outer sleeve 3 is dragged backwards along the transmission shaft 1 through the guide belt 5, the elastic piece 4 is compressed, the clamping block 2 is released to be in a state of being tightly attached to the positioning surface of the transmission shaft, the clamping block 2 can freely move outwards, the drill bit 100 can be inserted at the moment, and the clamping block 2 is forced to move outwards along the radial direction of the installation hole through the drill bit chamfer and the first chamfer 201 of the clamping block 2; when the drill bit 100 is disassembled, the outer sleeve 3 is dragged backwards along the transmission shaft 1 through the guide belt 5, the elastic part 4 is compressed, the clamping block 2 and the transmission shaft positioning surface are released to be in a close-fitting state, the clamping block 2 can move outwards freely, so that the extrusion state between the clamping block 2 and the drill bit 100 is relieved, the drill bit 100 can be pulled out at the moment, and the clamping block 2 is forced to move outwards along the radial direction of the mounting hole through the drill bit chamfer and the second chamfer 202 of the clamping block 2.
The first chamfer 201 and/or the second chamfer 202 is/are 30-60 deg.. Specifically, specific angles of the first chamfer 201 and the second chamfer 202 are not limited, but of course, too large or too small angles of the first chamfer 201 and the second chamfer 202 affect the fit between the cartridge 2 and the drill bit 100, and a chamfer of 45 ° is preferable to ensure the fit therebetween.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The quick-change drill bit device is characterized by comprising a transmission shaft (1), a clamping block (2), an outer sleeve (3) and an elastic piece (4), wherein a mounting groove in the front end of the transmission shaft (1) is used for mounting a drill bit (100), the outer sleeve (3) is sleeved on the transmission shaft (1), the elastic piece (4) is sleeved on the transmission shaft (1), the fixed end of the elastic piece is fixedly connected with the transmission shaft (1), and the elastic piece (4) is compressed when the outer sleeve (3) moves towards the rear end of the transmission shaft (1);
the transmission shaft (1) is provided with a mounting hole with a groove positioning surface inside, the fixture block (2) is mounted in the mounting hole and is in contact with the groove positioning surface, and a chamfer matched with the drill chamfer is arranged at the position where the fixture block (2) is in contact with the drill (100);
overcoat (3) cover fixture block (2) and as its orientation when the rear end of transmission shaft (1) moves to the settlement position reserve and be used for fixture block (2) are followed the space that radially removes of transmission shaft (1), and, work as overcoat (3) orientation the front end of transmission shaft (1) extrudees when moving to the settlement position fixture block (2).
2. The quick-change drill device according to claim 1, characterized by further comprising a guide belt (5), wherein the guide belt (5) is arranged in a circle along the circumference of the transmission shaft (1), and the outer sleeve (3) is moved along the transmission shaft (1) through the guide belt (5).
3. The quick-change drill bit device according to claim 1, characterized by further comprising a spring seat (6), wherein the spring seat (6) is fixed on the transmission shaft (1), the elastic member (4) is a spring, and the fixed end of the elastic member (4) is connected with the spring seat (6).
4. A quick-change drill bit device according to claim 3, characterized in that a closed space is formed between the outer sleeve (3) and the spring seat (6), and the resilient member (4) is arranged in the closed space.
5. The quick-change drill bit device according to claim 3, characterized by further comprising a clamp spring (7), wherein the clamp spring (7) is arranged in a circle along the circumferential direction of the transmission shaft (1) and is used for axially limiting the spring seat (7).
6. The quick-change drill bit device according to claim 1, characterized in that the edge of the front end of the outer sleeve (3) contacting the transmission shaft (1) is provided with a third chamfer (301).
7. The quick-change drill bit device according to claim 1, characterized in that the number of the mounting holes is two, the two mounting holes are symmetrically arranged along the axial direction of the transmission shaft (1) and the included angle between the two mounting holes is 90 °.
8. The quick-change drill bit device according to claim 1, characterized in that the inner wall of the outer sleeve (3) is stepped to match the outer wall of the transmission shaft (1), and the distance between the front inner wall surface of the outer sleeve (3) and the axis of the transmission shaft (1) is larger than the distance between the rear inner wall surface of the outer sleeve and the axis of the transmission shaft (1).
9. The quick-change drill bit device as claimed in claim 1, characterized in that the mounting hole is a square hole, and the peripheral outer wall surface of the fixture block (2) is tangent to the peripheral inner wall surface of the mounting hole.
10. The quick-change drill bit device according to any one of claims 1-9, characterized in that the chamfers comprise a first chamfer (201) and a second chamfer (202), and the first chamfer (201) and the second chamfer (202) are respectively located at two ends of the fixture block (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110767388.8A CN113414605A (en) | 2021-07-07 | 2021-07-07 | Quick-change drill bit device |
| PCT/CN2022/075182 WO2023279714A1 (en) | 2021-07-07 | 2022-01-30 | Quick-change drill bit apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110767388.8A CN113414605A (en) | 2021-07-07 | 2021-07-07 | Quick-change drill bit device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113414605A true CN113414605A (en) | 2021-09-21 |
Family
ID=77720428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110767388.8A Pending CN113414605A (en) | 2021-07-07 | 2021-07-07 | Quick-change drill bit device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113414605A (en) |
| WO (1) | WO2023279714A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023279714A1 (en) * | 2021-07-07 | 2023-01-12 | 北京天泽电力集团有限公司 | Quick-change drill bit apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2001234949A1 (en) * | 2000-02-14 | 2001-08-27 | Black And Decker Inc. | Chuck and assembly with bit |
| US6651990B2 (en) * | 2001-08-06 | 2003-11-25 | Ryobi Ltd. | Tool holder |
| CN2853239Y (en) * | 2006-01-12 | 2007-01-03 | 郑国良 | Device for quickly changing bit of rail drill |
| CN203092790U (en) * | 2013-02-01 | 2013-07-31 | 江苏金立电子机械科技有限公司 | Drill with connector capable of being replaced fast |
| CN210305851U (en) * | 2019-07-19 | 2020-04-14 | 江苏瑞力泰铁路科技有限公司 | Drill bit quick-change mechanism for steel rail drilling machine |
| CN214979303U (en) * | 2021-07-07 | 2021-12-03 | 北京天泽电力集团有限公司 | Quick-change drill bit device |
| CN113414605A (en) * | 2021-07-07 | 2021-09-21 | 北京天泽电力集团有限公司 | Quick-change drill bit device |
-
2021
- 2021-07-07 CN CN202110767388.8A patent/CN113414605A/en active Pending
-
2022
- 2022-01-30 WO PCT/CN2022/075182 patent/WO2023279714A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023279714A1 (en) * | 2021-07-07 | 2023-01-12 | 北京天泽电力集团有限公司 | Quick-change drill bit apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023279714A1 (en) | 2023-01-12 |
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