CN110977639A - Hole grinding tool for rock drill head - Google Patents
Hole grinding tool for rock drill head Download PDFInfo
- Publication number
- CN110977639A CN110977639A CN201911400244.8A CN201911400244A CN110977639A CN 110977639 A CN110977639 A CN 110977639A CN 201911400244 A CN201911400244 A CN 201911400244A CN 110977639 A CN110977639 A CN 110977639A
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- CN
- China
- Prior art keywords
- bushing
- shaped
- sleeve
- flexible
- arc
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
Abstract
The invention discloses a rock drill head grinding hole tool which comprises a connecting disc, a clamp body, a nut, a clamping plate, an elastic taper sleeve, a positioning sleeve and a flexible bushing, wherein one end of the clamp body is fixed with the connecting disc, the positioning sleeve is installed on the connecting disc and is coaxial, the positioning sleeve is positioned in the clamp body, the elastic taper sleeve is inserted from the other end of the clamp body, the flexible bushing is inserted into the elastic taper sleeve, a machine head to be machined is installed in the flexible bushing, the nut is connected with the clamping plate, the clamping plate is clamped on the elastic taper sleeve, and a nut thread pair is connected to the port of the other end of the clamp body. The hole grinding tool for the rock drill head has the advantages that the flexible bushing is wrapped outside the middle cylindrical surface of the rock drill head, so that the irregular rock drill head is convenient to position and mount; the flexible bushing and the part to be processed are pressed by the elastic taper sleeve with the centering function, so that the centering precision is high, and the clamping is reliable; the machine head hole grinding tool clamp is good in rigidity, high in precision and simple in structure.
Description
Technical Field
The invention relates to a rock drill head grinding hole tool, and belongs to the technical field of process equipment for machining.
Background
The yT23 rock drill is a high-efficiency air-leg rock drill, mainly used for rock drilling operation in mining roadway tunneling, is also an important tool in railway, water conservancy construction and national defense stone engineering, can perform wet rock drilling on medium-hard and hard rocks, and can drill horizontal and inclined blast holes.
The machine head related to the design is one of the main parts of the yT23 rock drilling machine. The part is roughly cylindrical, and the blank is mostly a forging or a precision casting. In the grinding process of the inner hole of the machine head, due to the irregular shape of parts, a fork-shaped drill clamp supporting frame 92 is arranged at the left end and protrudes out of a cylindrical surface 91, two lug plate 93 protrusions and another cylindrical protrusion 94 which are provided with pull rod bolt holes are arranged at the right end, so that the workpiece is difficult to clamp, common three-jaw tools are inconvenient to clamp, and the clamping precision of the two-jaw tool in the conventional design is not too high. In order to meet the machining requirements and guarantee machining precision, a special tool for drilling a rock drill head is designed.
Disclosure of Invention
The invention aims to provide a rock drill head grinding hole tool which is wrapped outside a middle cylindrical surface of a machine head by a flexible bushing, so that an irregular machine head is convenient to position and mount.
The specific technical scheme is as follows: a rock drill head grinding hole tool comprises a connecting disc, a clamp body, a nut, a clamping plate, an elastic taper sleeve, a positioning sleeve and a flexible bushing,
one end of the fixture body is fixed with the connecting disc, the positioning sleeve is arranged on the connecting disc and is coaxial, the positioning sleeve is positioned in the fixture body, the elastic taper sleeve is inserted from the other end of the fixture body, the flexible bushing is inserted into the elastic taper sleeve, a machine head to be processed is arranged in the flexible bushing, the nut is connected with the clamping plate, the clamping plate is clamped on the elastic taper sleeve, and the nut thread pair is connected with the port at the other end of the fixture body;
the flexible bushing comprises a first arc-shaped bushing, a second arc-shaped bushing and a fan-shaped wedge block, the sections of the first arc-shaped bushing and the second arc-shaped bushing are arc-shaped, and the first arc-shaped bushing, the second arc-shaped bushing and the fan-shaped wedge block are encircled to form a sleeve-shaped flexible bushing;
the first arc-shaped bushing and the second arc-shaped bushing are formed by enclosing a plurality of fan-shaped pressing blocks and a plurality of flexible clapboards, the fan-shaped pressing blocks and the flexible clapboards are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks and the flexible clapboards are connected through an adhesive; a space is reserved between the outer surface of the flexible clapboard and the outer surface of the lining, and a space is reserved between the inner surface of the flexible clapboard and the inner surface of the lining;
the machine head to be processed is arranged in the inner hole of the flexible bushing, and the fan-shaped wedge block is provided with a notch for avoiding the cylindrical protrusion on the machine head.
According to the technical scheme, the flexible bushing can radially contract or expand under the action of external force due to the elasticity of the flexible partition plate and the existence of the U-shaped folds.
Preferably, the connecting disc is a disc-shaped flange provided with a central hole, the right end face of the connecting disc is provided with a first spigot coaxial with the central hole, and the first spigot is matched with an inner hole at the left end of the clamp body, so that the coaxiality of the clamp body and the connecting disc is ensured.
Preferably, the positioning sleeve is a revolving body part provided with an inner hole, and the positioning sleeve is connected with the connecting disc through an annular flange arranged on the outer surface of the left end; and a second spigot arranged at the right end port of the positioning sleeve is matched with an inner hole at the left end port of the machine head.
Preferably, the clamp body is a rotary part provided with an inner hole, the inner hole at the left end of the clamp body is a cylindrical inner hole, the inner hole at the right end of the clamp body is a conical hole, and the large opening of the conical hole faces the right; the right end conical hole of the fixture body is matched with the outer conical surface of the elastic taper sleeve; and an external thread is arranged on the outer surface of the right end port of the clamp body.
Preferably, the elastic taper sleeve is a revolving body part provided with an inner hole, and the inner hole of the elastic taper sleeve is a cylindrical inner hole; a plurality of first long grooves and second long grooves are axially formed in the elastic taper sleeve, the first long grooves are formed from the left end to the right end of the elastic taper sleeve, the second long grooves are formed from the right end to the left end of the elastic taper sleeve, and the first long grooves and the second long grooves are alternately arranged; the outer surface of the elastic taper sleeve is a conical surface, and the small end of the conical surface is positioned at the left end of the elastic taper sleeve; a section of annular cylinder is extended from the right end port of the elastic taper sleeve, and the diameter of an inner hole of the annular cylinder is equal to that of an inner hole of the elastic taper sleeve; the outer surface of the annular cylinder is provided with an annular clamping groove for clamping the clamping plate.
Preferably, the nut is in threaded connection with the clamp body, and the right end face of the nut is fixed with the clamping plate through a screw.
Preferably, the outer surface of the right end of the nut is a polygonal surface. The polygonal surface is used for being clamped by a spanner.
Preferably, the clamping plate is formed by folding two semicircular thin plates.
Preferably, the first arc-shaped bushing and the second arc-shaped bushing are sleeved with the thin-wall sleeve along the axial direction, and the thin-wall sleeve is wrapped on the surfaces of the first arc-shaped bushing and the second arc-shaped bushing; the thin wall sleeve is sleeved in the space between the outer surface of the flexible clapboard and the outer surface of the bushing and the space between the inner surface of the flexible clapboard and the inner surface of the bushing to form U-shaped folds; the thin-wall sleeve is made of thin steel plates.
Preferably, the flexible partition board is made of soft materials, and the soft materials are rubber.
The invention has the beneficial effects that:
1. the hole grinding tool for the rock drill head is wrapped outside a middle cylindrical surface of the rock drill head by the flexible bushing, so that the irregular rock drill head is convenient to position and install.
2. The rock drill head grinding hole tool uses the elastic taper sleeve with the centering function to press the flexible bushing and the part to be processed, and is high in centering precision and reliable in clamping.
3. The rock drill head grinding hole tool is good in rigidity, high in precision and simple in structure.
Drawings
Fig. 1 is a general view of a rock drill head grinding hole tooling (with the head installed).
Fig. 2 is a cut-away view of a rock drill head grinding hole tool.
FIG. 3 is an assembled cutaway view of the clamp body, nut, snap-gauge and resilient cone.
FIG. 4 is a detail view of the flexible liner.
Fig. 5 is a component view of a first arcuate bushing.
FIG. 6 is a detail view of a sector wedge within a flexible bushing.
Fig. 7 is a detail view of a prior art handpiece.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
In order to make the disclosure of the present invention more comprehensible, the following description is further made in conjunction with fig. 1 to 7 and the detailed description.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The yT23 rock drill is a high-efficiency air-leg rock drill, mainly used for rock drilling operation in mining roadway tunneling, is also an important tool in railway, water conservancy construction and national defense stone engineering, can perform wet rock drilling on medium-hard and hard rocks, and can drill horizontal and inclined blast holes.
As shown in fig. 7, the present design relates to a head 90 which is one of the main parts of the yT23 rock drill. The part is roughly cylindrical, and comprises a cylindrical surface 91, a drill clamp support frame 92, an ear plate 93 provided with a pull rod bolt hole, a cylindrical bulge 94 and an inner hole 95, wherein a blank is mostly a forged piece or a precision casting piece. In the grinding process of the inner hole 95 of the machine head, due to the irregular shape of parts, the fork-shaped drill clamp support frame 92 at the left end protrudes out of the cylindrical surface 91, and the two lug plate 93 bulges and the other cylindrical bulge 94 which are provided with pull rod bolt holes are arranged at the right end, so that the workpiece is difficult to clamp, common three-jaw tools are inconvenient to clamp, and the clamping precision of the two-jaw tool in the conventional design is not too high. In order to meet the machining requirements and guarantee machining precision, a special tool for grinding a rock drill head is designed.
As shown in fig. 1 and 2, the tool for grinding the drill head of the rock drill in the embodiment includes a coupling plate 10, a clamp body 20, a nut 30, a clamping plate 40, an elastic taper sleeve 50, a positioning sleeve 60 and a flexible bushing 70, wherein one end of the clamp body 20 is fixed to the coupling plate 10, the positioning sleeve 60 is coaxially mounted on the coupling plate 10, the positioning sleeve 60 is located in the clamp body 20, the elastic taper sleeve 50 is inserted from the other end of the clamp body 20, the flexible bushing 70 is inserted into the elastic taper sleeve 50, the drill head 90 to be processed is mounted in the flexible bushing 70, the nut 30 is connected with the clamping plate 40, the clamping plate 40 is clamped on the elastic taper sleeve 50, and the nut 30 is in threaded connection with a port at the other end of the clamp.
As shown in fig. 2, the coupling plate 10 is a disc-shaped flange with a central hole, a first spigot coaxial with the central hole is arranged on the right end face of the coupling plate 10, and the first spigot is matched with an inner hole at the left end of the clamp body 20 to ensure the coaxiality of the clamp body 20 and the coupling plate 10.
As shown in fig. 2, the positioning sleeve 60 is a revolving body component provided with an inner hole, the positioning sleeve 60 is matched and positioned with the central hole of the coupling disk 10 through an annular positioning cylinder convexly arranged on the end surface of the left end, and the positioning sleeve 60 is connected with the coupling disk 10 through an annular flange arranged on the outer surface of the left end; the right end port of the positioning sleeve 60 is provided with a second spigot which is matched with an inner hole at the left end port of the machine head 90, and the diameter of the inner hole of the positioning sleeve 60 is slightly larger than that of the inner hole at the left end of the machine head 90.
As shown in fig. 2 and 3, the fixture body 20 is a revolving body part provided with an inner hole, the inner hole at the left end of the fixture body 20 is a cylindrical inner hole, the inner hole at the right end of the fixture body 20 is a tapered hole, and the large opening of the tapered hole faces to the right; the right end taper hole of the fixture body 20 is matched with the outer taper surface of the elastic taper sleeve 50; an external thread is provided on the outer surface of the right end port of the clamp body 20. The orifice of the cylindrical inner hole at the left end of the clamp body 20 is matched with a spigot arranged on the right end face of the connecting disc 10, and the left end of the clamp body 20 is provided with a flange which is coaxially and fixedly connected with the connecting disc 10 through a screw.
As shown in fig. 2 and 3, the elastic taper sleeve 50 is a revolving body part provided with an inner hole, and the inner hole of the elastic taper sleeve 50 is a cylindrical inner hole; a plurality of first long grooves and second long grooves are axially formed in the elastic taper sleeve 50, the first long grooves are formed from the left end to the right end of the elastic taper sleeve 50, the second long grooves are formed from the right end to the left end of the elastic taper sleeve 50, and the first long grooves and the second long grooves are alternately arranged; the outer surface of the elastic taper sleeve 50 is a conical surface, and the small end of the conical surface is positioned at the left end of the elastic taper sleeve 50; a section of annular cylinder extends from the right end port of the elastic taper sleeve 50, and the diameter of an inner hole of the annular cylinder is equal to that of the inner hole of the elastic taper sleeve 50; and the outer surface of the annular cylindrical barrel is provided with an annular clamping groove for clamping the clamping plate 40.
As shown in fig. 3, the nut 30 is screwed to the clamp body 20, and the right end surface of the nut 30 is fixed to the chuck plate 40 by a screw. The outer surface of the right end of the nut 30 is a polygonal surface for being clamped by a wrench. The clamping plate 40 is clamped in an annular clamping groove at the outer side of the right end of the elastic taper sleeve 50, and the clamping plate 40 is formed by folding two semicircular thin plates.
A spanner is used for clamping the polygonal surface to rotate the nut 30 clockwise, the nut 30 pushes the elastic taper sleeve 50 to move axially towards the left through the clamping plate 40, and the taper hole at the right end of the clamp body 20 pushes the elastic taper sleeve 50 to contract radially. The cylindrical inner hole of the elastic taper sleeve 50 is reduced, the flexible bushing 70 is extruded, the flexible bushing is extruded to radially contract, and the cylindrical surface of the middle section of the machine head 90 is compressed, so that the purpose of positioning and clamping the machine head 90 is achieved.
As shown in fig. 4, 5 and 6, the flexible bushing 70 includes a first arc-shaped bushing 71, a second arc-shaped bushing 72 and a segmental wedge 73, the first arc-shaped bushing 71 and the second arc-shaped bushing 72 are arc-shaped in cross section, and the first arc-shaped bushing 71, the second arc-shaped bushing 72 and the segmental wedge 73 enclose a sleeve-shaped flexible bushing; the first arc-shaped bushing 71 and the second arc-shaped bushing 72 are formed by enclosing a plurality of fan-shaped pressing blocks 74 and a plurality of flexible clapboards 75, the fan-shaped pressing blocks 74 and the flexible clapboards 75 are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks 74 and the flexible clapboards 75 are connected through an adhesive; a space is left between the outer surface of the flexible diaphragm 75 and the outer surface of the liner. The flexible partition 75 is made of a soft material, and the soft material is rubber.
As shown in fig. 5, a thin-walled sleeve 76 is axially inserted into the first arc-shaped bushing 71 and the second arc-shaped bushing 72, and the thin-walled sleeve 76 is made of thin steel plate. The thin-wall sleeve 76 is wrapped on the surfaces of the first arc-shaped bushing 71 and the second arc-shaped bushing 72; the thin walled sleeve 76 forms U-shaped corrugations 77 in the space between the outer surface of the flexible baffle 75 and the outer surface of the liner and the space between the inner surface of the flexible baffle 75 and the inner surface of the liner, the U-shaped corrugations 77 increasing the flexibility of the thin walled sleeve 76.
As shown in FIGS. 2 and 6, the head 90 to be machined is inserted into the inner bore of the flexible bushing 70, the cylindrical surface of the middle portion of the head 90 contacts the inner bore of the flexible bushing 70, and the notch 78 of the segmented wedge 73 corresponds to the cylindrical protrusion 94 of the head 90. The flexible bushing 70 may radially contract or expand under an external force due to the elasticity of the flexible diaphragm 75 and the presence of the U-shaped corrugations 77.
The working process of the hole grinding tool for the rock drill head in the embodiment is as follows:
the flexible bushing 70 is wrapped outside the middle cylindrical surface of the machine head 90, the drill clamp support frame 92 of the machine head 90 is placed towards the left direction, and the machine head wrapped with the flexible bushing is integrally inserted into the elastic taper sleeve 50 of the hole grinding tool, so that an inner hole of a port at the left end of the machine head 90 is matched with a second spigot at the right end of the positioning sleeve 60.
A spanner is used for clamping the polygonal surface to rotate the nut 30 clockwise, the nut 30 pushes the elastic taper sleeve 50 to move axially towards the left through the clamping plate 40, and the taper hole at the right end of the clamp body pushes the elastic taper sleeve 50 to contract radially. The cylindrical inner hole of the elastic taper sleeve 50 is reduced, the flexible bushing is extruded to shrink radially, the cylindrical surface of the middle section of the machine head 90 is compressed, and the purpose of positioning and clamping the machine head 90 is achieved.
After the inner hole is ground, the nut 30 is rotated reversely, the nut 30 pushes the elastic taper sleeve 50 to move towards the right axial direction through the clamping plate 40, the elastic taper sleeve 50 elastically returns in the radial direction, the cylindrical inner hole at the right end of the elastic taper sleeve 50 is enlarged, the flexible bushing 70 is loosened, and the whole machine head wrapping the flexible bushing is pulled out of the clamp rightwards.
And replacing the other machine head and repeating the actions.
Where not otherwise indicated herein or enabled by the prior art, it will be appreciated that modifications and variations may be resorted to without departing from the scope of the invention as set forth in the appended claims.
Claims (10)
1. The utility model provides a rock drill aircraft nose grinding hole frock which characterized in that: the clamping fixture comprises a connecting disc (10), a fixture body (20), a nut (30), a clamping plate (40), an elastic taper sleeve (50), a positioning sleeve (60) and a flexible bushing (70), wherein one end of the fixture body (20) is fixed with the connecting disc (10), the positioning sleeve (60) is installed on the connecting disc (10) and is coaxial, the positioning sleeve (60) is located in the fixture body (20), the elastic taper sleeve (50) is inserted from the other end of the fixture body (20), the flexible bushing (70) is inserted into the elastic taper sleeve (50), a machine head (90) to be processed is installed in the flexible bushing (70), the nut (30) is connected with the clamping plate (40), the clamping plate (40) is clamped on the elastic taper sleeve (50), and the nut (30) is in threaded pair connection with the port at the other end of the fixture body (20);
the flexible bushing (70) comprises a first arc-shaped bushing (71), a second arc-shaped bushing (72) and a fan-shaped wedge block (73), the cross sections of the first arc-shaped bushing (71) and the second arc-shaped bushing (72) are arc-shaped, and the first arc-shaped bushing (71), the second arc-shaped bushing (72) and the fan-shaped wedge block (73) enclose a sleeve-shaped flexible bushing; the first arc-shaped bushing (71) and the second arc-shaped bushing (72) are formed by enclosing a plurality of fan-shaped pressing blocks (74) and a plurality of flexible clapboards (75), the fan-shaped pressing blocks (74) and the flexible clapboards (75) are alternately arranged, and the connecting surfaces of the fan-shaped pressing blocks (74) and the flexible clapboards (75) are connected through an adhesive; a space is reserved between the outer surface of the flexible baffle plate (75) and the outer surface of the bushing, and a space is reserved between the inner surface of the flexible baffle plate (75) and the inner surface of the bushing;
a machine head (90) to be machined is arranged in an inner hole of the flexible bushing (70), and a notch (78) used for avoiding a cylindrical protrusion (94) on the machine head (90) is arranged on the fan-shaped wedge block (73).
2. The rock drill head grinding hole tool is characterized in that the connecting disc (10) is a disc-shaped flange provided with a central hole, a first spigot coaxial with the central hole is arranged on the right end face of the connecting disc (10), and the first spigot is matched with an inner hole in the left end of the clamp body (20).
3. The rock drill head grinding hole tool according to claim 1, characterized in that the positioning sleeve (60) is a revolving body part provided with an inner hole, and the positioning sleeve (60) is connected with the connecting disc (10) through an annular flange arranged on the outer surface of the left end; a second spigot arranged at the right end port of the positioning sleeve (60) is matched with an inner hole at the left end port of the machine head (90).
4. The rock drill head grinding hole tool according to claim 1, characterized in that the fixture body (20) is a revolving body part provided with an inner hole, the inner hole at the left end of the fixture body (20) is a cylindrical inner hole, the inner hole at the right end of the fixture body (20) is a tapered hole, and the large opening of the tapered hole faces right; the right end taper hole of the fixture body (20) is matched with the outer taper surface of the elastic taper sleeve (50); an external thread is arranged on the outer surface of the right end port of the clamp body (20).
5. The rock drill head grinding hole tool according to claim 1, characterized in that the elastic taper sleeve (50) is a revolving body part provided with an inner hole, and the inner hole of the elastic taper sleeve (50) is a cylindrical inner hole; a plurality of first long grooves and second long grooves are axially formed in the elastic taper sleeve (50), the first long grooves are formed from the left end to the right end of the elastic taper sleeve (50), the second long grooves are formed from the right end to the left end of the elastic taper sleeve (50), and the first long grooves and the second long grooves are alternately arranged; the outer surface of the elastic taper sleeve (50) is a conical surface, and the small end of the conical surface is positioned at the left end of the elastic taper sleeve (50); a section of annular cylinder is extended from the right end port of the elastic taper sleeve (50), and the diameter of an inner hole of the annular cylinder is equal to that of the inner hole of the elastic taper sleeve (50); the outer surface of the annular cylinder is provided with an annular clamping groove for clamping the clamping plate (40).
6. The rock drill head grinding hole tool is characterized in that a nut (30) is in threaded connection with the clamp body (20), and the right end face of the nut (30) and the clamping plate (40) are fixed through screws.
7. The rock drill head grinding hole tool according to claim 6, characterized in that the outer surface of the right end of the nut (30) is a polygonal surface.
8. The rock drill head grinding hole tool according to claim 1, characterized in that the clamping plate (40) is formed by folding two semicircular thin plates.
9. The rock drill head grinding hole tool is characterized in that a thin-wall sleeve (76) is sleeved on the first arc-shaped bushing (71) and the second arc-shaped bushing (72) in the axial direction, and the thin-wall sleeve (76) is wrapped on the surfaces of the first arc-shaped bushing (71) and the second arc-shaped bushing (72); the thin-walled sleeve (76) forms U-shaped corrugations (77) both in the spacing between the outer surface of the flexible diaphragm (75) and the outer surface of the liner and in the spacing between the inner surface of the flexible diaphragm (75) and the inner surface of the liner; the thin-walled sleeve (76) is made of thin steel plate.
10. The rock drill head grinding hole tool according to claim 9, characterized in that the flexible partition (75) is made of soft material, and the soft material is rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911400244.8A CN110977639A (en) | 2019-12-30 | 2019-12-30 | Hole grinding tool for rock drill head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911400244.8A CN110977639A (en) | 2019-12-30 | 2019-12-30 | Hole grinding tool for rock drill head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110977639A true CN110977639A (en) | 2020-04-10 |
Family
ID=70079235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911400244.8A Withdrawn CN110977639A (en) | 2019-12-30 | 2019-12-30 | Hole grinding tool for rock drill head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110977639A (en) |
-
2019
- 2019-12-30 CN CN201911400244.8A patent/CN110977639A/en not_active Withdrawn
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Application publication date: 20200410 |
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| WW01 | Invention patent application withdrawn after publication |