CN111648737A - Clamping type buckle-making fishing drill bit for underground coal mine - Google Patents
Clamping type buckle-making fishing drill bit for underground coal mine Download PDFInfo
- Publication number
- CN111648737A CN111648737A CN202010622199.7A CN202010622199A CN111648737A CN 111648737 A CN111648737 A CN 111648737A CN 202010622199 A CN202010622199 A CN 202010622199A CN 111648737 A CN111648737 A CN 111648737A
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- CN
- China
- Prior art keywords
- fishing
- sleeve
- making
- buckling
- slip
- 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
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/16—Grappling tools, e.g. tongs or grabs combined with cutting or destroying means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
Abstract
The invention discloses a clamping type making and buckling fishing drill bit for underground coal mines, which comprises a fishing sleeve assembly and a making and buckling assembly arranged in the fishing sleeve assembly, wherein the fishing sleeve assembly is provided with a central axis, the opening assembly comprises at least two making and buckling slips and a driving assembly, the making and buckling slips are arranged around the central axis in a circumferential array, and the driving assembly can drive each making and buckling slip to be relatively close to each other in the radial direction so as to clamp a drilling tool to be fished; the fishing drill bit has the dual functions of fishing clamping and button making, can be used for button making and milling fishing, can greatly reduce the difficulty of extracting the end part of a drilling tool to be fished, and improves the success rate of fishing of the drilling tool.
Description
Technical Field
The invention relates to the technical field of mining machinery, in particular to a clamping type making and fishing drill bit for underground coal mines.
Background
During the underground drilling construction of the coal mine, the drill rod is often broken due to the complex stratum, and in order to recover the economic loss caused by drill dropping, the fishing operation is mostly carried out in the field construction. The fishing drill bit is a core device for fishing operation and is a key tool for fishing success and failure. At present, domestic and foreign salvage modes are mainly classified into the following categories: the male and female cones are used for fishing threads by directly making buckles, so that the fishing is difficult and the success rate is low; milling and salvaging are mainly carried out along the drill rod, the raised part of the drilling tool in the hole is clamped by the inner circular bead of the salvaging drill bit, the salvaging of the drill rod is realized, the salvaging is mainly carried out on the directional hole, the application range is narrow, and the success rate is low; the fishing barrel is used for fishing, the fishing falling-off phenomenon often occurs in fishing, and the success rate is not high as well.
In view of the problems of the fishing drill bit used in the fishing mode during fishing, the clamping type catch fishing drill bit for the underground coal mine is needed, the difficulty in sleeving and taking the end part of the broken drilling tool is reduced, and the success rate of fishing the drilling tool is improved.
Disclosure of Invention
In view of the above, the invention provides a clamping type making and fishing drill bit for underground coal mines, which reduces the difficulty in sleeving and taking the end part of a broken drilling tool and improves the success rate of fishing the drilling tool.
The invention discloses a clamping type making and buckling fishing drill bit for underground coal mines, which comprises a fishing sleeve assembly and a making and buckling assembly arranged in the fishing sleeve assembly, wherein the fishing sleeve assembly is provided with a central axis, the opening making assembly comprises at least two making and buckling slips and a driving assembly, the making and buckling slips are arranged around the central axis in a circumferential array, and the driving assembly can drive each making and buckling slip to relatively approach in the radial direction so as to clamp a drilling tool to be fished.
Furthermore, the inner side surface of the tripping slip is provided with a plurality of rows of cutting teeth which are arranged along the axial direction, and the height of each row of cutting teeth increases progressively from the front to the back along the axial direction.
Further, the inner wall of the salvaging sleeve assembly is provided with a sliding groove which inclines along the axial direction, the bottom of the sliding groove inclines along the axial direction from the front direction to the back direction, the making slip is installed in the sliding groove in a sliding mode along the inclined direction of the sliding groove, the driving assembly comprises an elastic piece, and the elastic piece has elastic force which enables the making slip to slide forwards along the axial direction.
Furthermore, the salvaging sleeve assembly comprises a joint sleeve and a bit body sleeve connected with the front end part of the joint sleeve, the inner circle of the joint sleeve is provided with a positioning shoulder formed by a protrusion, the sliding groove is formed in the inner wall of the bit body sleeve, and the elastic piece is arranged between the positioning shoulder and the buckle making slip and provides elastic force for the buckle making slip to slide forwards in the axial direction.
Furthermore, the fishing sleeve assembly also comprises a guide sleeve which is connected to the front end part of the drill bit body sleeve.
Furthermore, the bit body sleeve is detachably provided with a positioning piece, and the positioning piece is located one end, far away from the elastic piece, of the buckling slip in the axial direction and used for limiting the buckling slip in the axial direction.
Further, the inner circle diameter of the guide sleeve is larger than that of the drill bit body sleeve, a tapered guide inclined plane with a large front part and a small rear part is arranged at the front end part of the drill bit body sleeve, and the front end of the guide inclined plane extends to the inner circle of the guide sleeve and is not higher than the inner circle of the guide sleeve.
Furthermore, the driving assembly further comprises a synchronous cover, the positioning shoulder is an annular shoulder, the synchronous cover is axially sleeved in the positioning shoulder in a sliding mode, the elastic member is sleeved on the synchronous cover in an outer mode and has elastic force enabling the synchronous cover to axially slide inwards, and the front end of the synchronous cover is pressed on the rear end portion of the buckle making slip through the elastic force of the elastic member.
Further, the front end of the synchronous cover is in line contact or point contact with the rear end part of the make-up slip.
Furthermore, the guide sleeve excircle is connected with the PDC composite sheet.
The invention has the beneficial effects that:
the fishing drill bit with the structure has double functions of fishing clamping and button making, can be used for button making and milling fishing, and can greatly reduce the difficulty of sleeving and fetching the end part of a drilling tool to be fished; the heights of a plurality of rows of cutting teeth are arranged in an equal-difference ladder shape, when the button is made, a single groove is cut from the highest cutting edge, and a plurality of grooves are cut gradually, so that the groove can be cut progressively, the cutting teeth are used for cutting the groove on the surface of a drilling tool to be salvaged and hooking a broken drilling rod, the structure is simple in button making and high in cutting capacity, the clamping and button making performance is reliable through the plurality of rows of cutting teeth, the drilling rod to be salvaged is prevented from loosening in the process of withdrawing the drilling tool, the drilling tool to be salvaged is taken out after withdrawing the drilling tool, and the success rate of salvaging the;
the chute of the invention is matched with the making slip to form an inclined wedge type clamping mechanism, the making slip slides in the chute to realize radial opening and closing of the two making slip, when the drilling tool is fished, the drilling tool enters from the front end part of the fishing sleeve component, and the making slip can be pushed axially to lead the making slip to slide downwards along the sliding groove in an inclined way so as to lead the two making slips to be opened in a radial direction, when the drilling tool enters between the two buckling slips, the elastic piece pushes the buckling slips to slide upwards along the sliding groove in an inclined way, the two buckling slips are closed close to each other in the radial direction, applying clamping pretightening force to the surface of the drilling tool, pulling the fishing drill bit to enable the buckling slips to form inclined wedge self-locking, can realize deep buckle making until the fishing drill rod is fixedly connected with the buckle making of the drill rod to be fished in the hole, the structure has simple fishing operation, reduces the labor intensity of workers, can form good making buckles to be fixedly connected and is beneficial to improving the fishing success rate.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a partially enlarged schematic view of FIG. 2;
FIG. 4 is a schematic radial cross-sectional view of FIG. 1;
Detailed Description
FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a schematic view of the internal structure of the present invention; FIG. 3 is a partially enlarged schematic view of FIG. 2; FIG. 4 is a schematic radial cross-sectional view of FIG. 1;
as shown in the figure: the colliery is in pit with centre gripping formula knot making salvage drill bit of this embodiment, including salvaging the cover subassembly and installing the knot making subassembly in salvaging the cover subassembly, salvaging the cover subassembly and having a central axis, the mouth making subassembly includes around central axis and detains slips 1 and the drive assembly according to two at least knot making slips that the circumference array was arranged, the drive assembly can drive each and make the slip and radially be close to relatively treating by the fishing drilling tool with the chucking. The to-be-salvaged drilling tool refers to a drilling tool which is left in a drilling hole and needs to be salvaged, as shown in fig. 1, the whole salvaging sleeve assembly is a circular sleeve, the making slip is provided with an inner circular surface, the making slip is preferably made of hard alloy materials, two making slips are arranged in the embodiment and are radially opposite, the number of the making slips can be adjusted according to actual use conditions, and details are not repeated; the driving assembly can directly drive the buckling slips to radially slide so as to be close to and clamped at the excircle of the fishing drill, and the driving assembly can also drive the buckling slips to axially slide, wherein the buckling slips are matched with the inclined plane to slide to generate radial displacement, and detailed description is omitted; this structure will salvage the cover subassembly and is connected with salvage the drilling rod, and send salvage the drilling rod into to drilling through the rig together with whole salvage drill bit, make salvage the drill bit be located drilling tool breakage department or downthehole drilling tool bellying, and set and get on the drilling tool tip of breaking or downthehole drilling tool arch, make present treating to be located between two buckle slips by salvage drilling tool, then drive the buckle slips and be close to each other and treat to be salvaged the drilling tool and form clamping structure, so as to catch on the drilling tool that breaks off or directly entangle the drilling tool arch, then retreat the pole through the rig, pull out downthehole treating by salvage the drilling tool, the salvage drill bit of this structure has salvage centre gripping and buckle dual function, can be used to buckle and mill salvage, in addition can greatly reduced the degree of difficulty of nesting treating to be salvaged the.
In this embodiment, the inner side surface of the tripping slip is provided with a plurality of rows of cutting teeth 1a which are arranged along the axial direction, and the height of each row of cutting teeth increases from the front to the back in the axial direction. The axial direction all takes the central axis of the salvaging sleeve assembly as a reference, the axial front side is one side of the salvaging sleeve assembly which is sent to the advancing direction in the drill hole, the axial rear side is one side opposite to the axial front side, the inner side surface of the making slip is one side which is close to the central axis of the salvaging sleeve assembly in the radial direction, and the cutting teeth are preferably of an outward inclined barb structure; the heights of the three rows of cutting teeth are arranged in an equal-difference ladder shape, when the button is made, a single groove is cut from the highest cutting edge, the three grooves are cut gradually, the grooves can be cut progressively, the cutting teeth are used for cutting the grooves on the surface of the drilling tool to be salvaged and hooking the broken drilling rod, the button is made simply and easily by the structure, the cutting capacity is high, the clamping button making performance is reliable by the multiple rows of cutting teeth, the drilling rod to be salvaged is prevented from loosening in the process of withdrawing the drilling tool, the drilling tool to be salvaged is taken out in the process of withdrawing the drilling tool, and the success rate of salvaging the.
In this embodiment, the inner wall of the fishing sleeve assembly is provided with a sliding groove 2 which is inclined along the axial direction, the bottom of the sliding groove is inclined along the axial direction from the front direction to the back direction, which is radially far away from the central axis, the making slip is installed in the sliding groove in a sliding manner along the inclined direction of the sliding groove, the driving assembly comprises an elastic part 3, and the elastic part has an elastic force which enables the making slip to slide forwards along the axial direction. The matching surface of the making slip and the chute bottom is an inclined surface structure matched with the chute, the chute can be a T-shaped groove, a dovetail groove and the like, wherein the making slip is matched with the chute to realize the single-degree-of-freedom sliding matching of the making slip and the chute, in the embodiment, the chute adopts the T-shaped chute, the chute is matched with an inclined wedge type clamping mechanism formed by the making slip, the making slip slides in the T-shaped groove to realize the radial opening and closing of the two making slips, in the embodiment, the elastic element adopts a cylindrical spiral spring, and also can adopt an elastic structure such as a disc spring or a wave spring, when the drilling tool is fished, the drilling tool enters from the front end part of the fishing sleeve assembly and can axially push the making slip to enable the making slip to slide obliquely downwards along the chute, the two making slips are radially opened, when the drilling tool enters between the two making slips, the elastic element pushes the making slip to, two anchor slips are close to each other in the radial direction and are folded, clamping pretightening force is applied to the surface of a drilling tool, a shallow groove can be made on the surface of the fishing drilling tool to be fished through a cutting tooth after the fishing drill bit is driven to rotate, then the fishing drill bit is pulled by a retreating rod to enable the anchor slips to form inclined wedge self-locking, deep anchor making is continuously realized, the fishing drill rod is fixedly connected with the anchor in the hole to be fished, the fishing drill rod can be fished by pulling the fishing drill rod, the fishing drill rod can be fished, the fishing operation is simple, the labor intensity of workers is reduced, good anchor making can be formed, and the fishing success.
In this embodiment, the salvaging sleeve assembly comprises a joint sleeve 4 and a bit body sleeve 5 connected with the front end part of the joint sleeve, the inner circle of the joint sleeve is provided with a positioning shoulder 4a formed in a protruding mode, the sliding groove 2 is formed in the inner wall of the bit body sleeve, and the elastic piece is arranged between the positioning shoulder and the buckle making slip and provides elastic force for the buckle making slip to slide forwards in the axial direction. As shown in the combined figure 1, the rear end part of the joint sleeve is provided with an internal thread interface used for being connected with a salvage drill rod, the front end part of the joint sleeve is also provided with an internal thread structure, the front end part of the drill bit body sleeve is provided with an external thread interface used for being connected with the front end of the joint sleeve, the rear end part of the elastic piece is abutted against the positioning shoulder, the front end part of the elastic piece is abutted against the rear end part of the buckle making slip, the elastic piece is in a pre-compression state and serves as a power piece for driving the buckle making slip through the elastic piece, the elastic piece does not need to be hydraulically or electrically connected with external equipment, arrangement of a driving assembly is facilitated, external lines are.
In this embodiment, the fishing sleeve assembly further comprises a guide sleeve 6 connected to the front end of the bit body sleeve. The rear end of the guide sleeve is sleeved in the front end of the drill bit body sleeve and is connected with the drill bit body sleeve in a welding mode, the joint sleeve 4, the drill bit body sleeve 5 and the guide sleeve 6 are coaxially arranged, and the guide sleeve is used for guiding a salvage drill bit during cutting along a hole wall and guiding the end portion of a salvage drill rod; the guide sleeve is firstly arranged in the hole and used as a guide for the fishing drill bit to cut and drill along the hole wall until the fishing drill bit reaches the position of the to-be-fished drilling tool in the hole, and at the moment, the guide sleeve is used as an introduction section of the end part of the to-be-fished drilling tool to realize the sleeving and fetching of the end part of the to-be-fished drilling tool.
In this embodiment, the bit body sleeve 5 is detachably provided with a positioning member 7, and the positioning member is located at one end of the buckle making slip axially away from the elastic member and used for axially limiting the sliding of the buckle making slip. The setting element adopts the locating pin in this embodiment, the pinhole has been seted up on the bit body cover, the locating pin runs through in the pinhole, the interior tip of locating pin is located the spout and is less than the inner circle of making the knot slips slightly, the locating pin is located the front side of making the knot slips, the elastic component is located the rear side of making the knot slips, wherein make the lateral wall control that the slips axial slip stroke passes through setting element and spout rear side, do benefit to through this structure and make the elastic component keep certain precompression elastic force, and can be spacing to the slip stroke of making the knot slips.
In this embodiment, the inner circle diameter of the guide sleeve is larger than the inner circle diameter of the bit body sleeve 5, a tapered guide inclined plane 8 with a large front part and a small rear part is arranged at the front end of the axial direction of the bit body sleeve, and the front end of the guide inclined plane extends to the inner circle of the guide sleeve and is not higher than the inner circle of the guide sleeve. The structure arranged at the front end of the guide slope can avoid interference between the drill rod to be salvaged and the guide slope, is favorable for providing a good guide effect for the drill rod to be salvaged, ensures that the drill rod to be salvaged can enter a space defined by the buckle slips, has a good guide effect due to the larger inner circle diameter of the guide sleeve, is also favorable for sleeving and taking a drill rod to be salvaged, and improves the salvage success rate; the inner diameter of the drill bit body sleeve 5 is smaller than the inner diameter of the guide sleeve and slightly larger than the outer diameter of the drill tool to be salvaged, so that the buckling slip can stably and reliably clamp the drill tool to be salvaged, and cutting teeth can cut a groove on the surface of the excircle of the drill tool to be salvaged and hook the broken drill tool.
In this embodiment, the driving assembly further includes a synchronization cover 9, the positioning shoulder is an annular shoulder, the synchronization cover axially slides and is sleeved on the positioning shoulder, the elastic member is sleeved on the synchronization cover and has an elastic force for making the synchronization cover axially slide inwards, and the front end of the synchronization cover is pressed on the rear end portion of the buckle making slip by the elastic force of the elastic member. Referring to fig. 3, the front end of the synchronous cover is provided with a shaft shoulder, the two ends of the elastic element respectively abut against the shaft shoulder and a positioning shoulder, the synchronous motion of the buckle making slip is controlled by the elastic element and the synchronous cover, the synchronous cover is made of plastic or metal and the like which are similar to rigid materials, and acts on the buckle making slip through the synchronous cover, so that the stability of the elastic element can be ensured when the buckle making slip generates radial relative displacement, and the elastic element is prevented from being inclined by radial acting force.
In this embodiment, the front end of the synchronization cover is in line contact or point contact with the rear end of the make-up slip. As shown in fig. 3, the axial cross section of the front end of the synchronization cover is arc-shaped, so that the front end of the synchronization cover and the rear end of the buckle making slip are in a line contact structure, friction between the buckle making slip and the synchronization cover when the buckle making slip is radially displaced is reduced, resistance when the buckle making slip is pushed is reduced, and reliable sliding of the buckle making slip is facilitated;
in this embodiment, the uide bushing excircle is connected with the compound piece 10 of PDC. The PDC composite sheet is brazed on the outer circle of the guide sleeve in the circumferential direction to serve as a blade of the head of the guide sleeve, and when the rotary feeding motion of the fishing drill rod is carried out, coal rocks at the bottom of a hole are cut, so that the whole fishing drill bit can be conveniently conveyed to a specified position.
In addition, the embodiment also provides a using method of the underground coal mine clamping type buckling fishing bit, which specifically comprises the following steps:
s1: when the drilling tool in the hole is broken, the drill rod can be withdrawn from the hole, the fishing drill bit is conveyed to the broken part of the drilling tool or the bulge of the drilling tool in the hole along the hole wall or the drill rod in the hole by using the fishing drill rod, and the end part of the broken drilling tool or the bulge of the drilling tool in the hole is sleeved;
s2: pushing the salvaging drill bit to enable the end part of the broken drilling tool or the raised part of the drilling tool in the hole to extrude the buckling slips, so that the buckling slips are opened, and the broken drilling tool is positioned between the buckling slips;
s3: stopping pushing the drill bit, clamping the making slip on the drilling tool to be salvaged under the pretightening force of the elastic piece and the self-locking action of the inclined wedge, and rotating the salvage drill bit to ensure that the making slip gradually cuts out grooves at the end part of the broken drilling tool until a plurality of deep and shallow grooves are completely cut out so as to screw the broken drilling tool or directly sleeve the bulge;
s4: and (4) retreating the rod, pulling out the broken drilling tool in the hole, pushing the fishing drill bit towards the hole direction, opening the buckling slips, taking down the fishing drill bit, and realizing fishing of the broken drilling tool in the hole.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a colliery is detained salvage drill bit is made with centre gripping formula in pit which characterized in that: including salvaging the cover subassembly and installing the make the subassembly of detaining in salvaging the cover subassembly, salvaging the cover subassembly and having a central axis, it includes two piece at least make the slips and the drive assembly of detaining that arrange according to the circumference array around the central axis to make the subassembly, the drive assembly can drive each and make the slips radial relative be close to with the chucking and treat by the fishing drilling tool.
2. The underground coal mine gripping type buckling fishing bit according to claim 1, which is characterized in that: the inner side surface of the tripping slip is provided with a plurality of rows of cutting teeth which are arranged along the axial direction, and the height of each row of cutting teeth increases progressively from the front to the back along the axial direction.
3. The underground coal mine gripping type buckling fishing bit according to claim 1, which is characterized in that: the inner wall of the salvaging sleeve assembly is provided with a sliding groove which is inclined along the axial direction, the bottom of the sliding groove is inclined along the axial direction from the front to the back in the direction away from the central axis, the buckling slip is installed in the sliding groove in a sliding mode along the inclined direction of the sliding groove, the driving assembly comprises an elastic piece, and the elastic piece has elastic force which enables the buckling slip to slide forwards along the axial direction.
4. The underground clamping type buckling fishing bit for the coal mine according to claim 3, characterized in that: the salvaging sleeve assembly comprises a joint sleeve and a bit body sleeve connected with the front end part of the joint sleeve, the inner circle of the joint sleeve is provided with a positioning shoulder formed in a protruding mode, the sliding groove is formed in the inner wall of the bit body sleeve, and the elastic piece is arranged between the positioning shoulder and the buckle making slip and provides elastic force for the buckle making slip to slide forwards in the axial direction.
5. The underground coal mine gripping type buckling fishing bit according to claim 4, which is characterized in that: the fishing sleeve assembly further comprises a guide sleeve, and the guide sleeve is connected to the front end portion of the drill bit body sleeve.
6. The underground coal mine gripping type buckling fishing bit according to claim 4, which is characterized in that: the drill bit body is sheathe in and can dismantle and be provided with the setting element, the setting element is located and makes the slips axial and keep away from elastic component one end and be used for making and detain slips formation axial spacing.
7. The underground coal mine gripping type buckling fishing bit according to claim 5, which is characterized in that: the diameter of the inner circle of the guide sleeve is larger than that of the inner circle of the drill bit body sleeve, a tapered guide inclined plane with a large front part and a small rear part is arranged at the front end part of the shaft of the drill bit body sleeve, and the front end of the guide inclined plane extends to the inner circle of the guide sleeve and is not higher than the inner circle of the guide sleeve.
8. The underground coal mine gripping type buckling fishing bit according to claim 4, which is characterized in that: the driving assembly further comprises a synchronous cover, the positioning shoulder is an annular shoulder, the synchronous cover is axially sleeved in the positioning shoulder in a sliding mode, the elastic piece is sleeved on the synchronous cover in an outer mode and has elastic force enabling the synchronous cover to axially slide inwards, and the front end of the synchronous cover is pressed on the rear end portion of the buckle making slip through the elastic force of the elastic piece.
9. The underground coal mine gripping type buckling fishing bit according to claim 8, which is characterized in that: the front end of the synchronous cover is in line contact or point contact with the rear end of the make-up slip.
10. The underground coal mine gripping type buckling fishing bit according to claim 5, which is characterized in that: the guide sleeve excircle is connected with the PDC composite sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010622199.7A CN111648737A (en) | 2020-07-01 | 2020-07-01 | Clamping type buckle-making fishing drill bit for underground coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010622199.7A CN111648737A (en) | 2020-07-01 | 2020-07-01 | Clamping type buckle-making fishing drill bit for underground coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111648737A true CN111648737A (en) | 2020-09-11 |
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ID=72343144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010622199.7A Pending CN111648737A (en) | 2020-07-01 | 2020-07-01 | Clamping type buckle-making fishing drill bit for underground coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111648737A (en) |
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2020
- 2020-07-01 CN CN202010622199.7A patent/CN111648737A/en active Pending
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