CN214741193U - Clamping plate type drill rod fisher - Google Patents
Clamping plate type drill rod fisher Download PDFInfo
- Publication number
- CN214741193U CN214741193U CN202120378972.XU CN202120378972U CN214741193U CN 214741193 U CN214741193 U CN 214741193U CN 202120378972 U CN202120378972 U CN 202120378972U CN 214741193 U CN214741193 U CN 214741193U
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- Prior art keywords
- drill rod
- overshot
- fishing
- clamping plates
- guide plate
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- 238000005553 drilling Methods 0.000 claims abstract description 91
- 239000011111 cardboard Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of the drilling rod salvage technique and specifically relates to a cardboard formula drilling rod fisher is related to, its technical scheme main points are: the fishing device comprises an overshot with a downward opening, wherein the overshot can enter the deep well; two drill rod clamping plates are arranged inside the fishing barrel and hinged with the barrel wall of the fishing barrel; the total length of the two drill rod clamping plates along the direction close to the axis of the overshot is greater than the diameter of the overshot, the two drill rod clamping plates are inclined upwards, and the upper ends of the two clamping plates are mutually lapped; the top of the fishing barrel is provided with a fishing rope extending to the outside of the deep well; the purposes of enabling the drill rod to be salvaged more conveniently and rapidly, reducing the labor intensity of the drill rod salvage and improving the safety of construction are achieved.
Description
Technical Field
The application relates to the technical field of drilling rod salvage, in particular to a clamping plate type drilling rod fisher.
Background
The drilling machine is widely used for foundation construction projects such as municipal construction, highway bridges, high-rise buildings, wharf embankments and the like; when a drilling machine is in a drilling process, if abnormal geological conditions or special underground hard objects are met, a drill rod is easy to break, and at the moment, broken rods broken in deep wells need to be fished; in the related art, a drill rod salvaging method is that a worker enters a deep well and takes out a broken drill rod in the deep well manually; the method for salvaging the drill rod is difficult, and the labor intensity and the danger of salvaging the drill rod are increased to a certain extent.
SUMMERY OF THE UTILITY MODEL
In order to make the drilling rod salvage more convenient and fast, reduce the intensity of labour that the drilling rod was salvaged and improve the security of construction, this application provides a cardboard formula drilling rod fisher.
The application provides a cardboard formula drilling rod fisher adopts following technical scheme:
a clamping plate type drill rod fisher comprises an overshot with a downward opening, wherein the overshot can enter a deep well; two drill rod clamping plates are arranged inside the fishing barrel and hinged with the barrel wall of the fishing barrel; the total length of the two drill rod clamping plates along the direction close to the axis of the overshot is greater than the diameter of the overshot, the two drill rod clamping plates are inclined upwards, and the upper ends of the two clamping plates are mutually lapped; the top of the fishing barrel is provided with a fishing rope extending to the outside of the deep well.
By adopting the technical scheme, when a broken drill rod in a deep well needs to be salvaged, the fishing barrel is made to descend in the deep well until the drill rod positioned at the bottom of the deep well enters the interior of the fishing barrel through the fishing rope, the fishing barrel is made to descend continuously through the fishing rope, the drill rod continuously goes deep into the interior of the fishing barrel until the drill rod is positioned below a gap where two drill rod clamping plates abut against each other, then the fishing barrel is continuously descended until the drill rod pushes the drill rod clamping plates to rotate upwards around a self articulated shaft, a gap for the drill rod to pass through is generated between the two drill rod clamping plates, the fishing barrel continuously descends until the drill rod completely passes through the space between the two drill rod clamping plates, and the peripheral surface of the drill rod is attached to the side edges, close to each other, of the two drill rod clamping plates at the moment; afterwards, the fishing barrel moves upwards through the fishing rope, the drill rod can generate a trend of being away from the fishing barrel due to self weight, but the drill rod is clamped between the two drilling rod clamping plates due to the side edges, close to each other, of the two drilling rod clamping plates, if the drill rod moves downwards relative to the fishing barrel, the two drilling rod clamping plates can generate a trend of rotating downwards around a hinge shaft of the two drilling rod clamping plates due to friction force and extrusion force, but the total length of the two drilling rod clamping plates in the direction close to the axis of the fishing barrel is larger than the diameter of the fishing barrel, so that the trend that the two drilling rod clamping plates block the downward movement of the drill rod, namely the drill rod is clamped between the two drilling rod clamping plates at the moment; finally, the fishing barrel and the drill rod clamped in the fishing barrel are pulled out through the fishing rope; the salvaging of the broken drill rod is completed, the process does not require workers to enter the deep well, the drill rod is further convenient and fast to salvage, the labor intensity of the salvaging of the drill rod is reduced, and the construction safety is improved.
Preferably, the lower end face of the overshot is coaxially provided with a guide plate, the guide plate is hollow, the wall of the guide plate inclines to a bell mouth shape from top to bottom in a direction away from the axis of the guide plate, and the diameter of the lower end of the guide plate is equal to that of the deep well.
By adopting the technical scheme, after the drill rod is broken, the upper end of the drill rod can topple over or even be lapped on the well wall of the deep well due to poor stability; when overshot downstream, it contacts the drilling rod earlier than in the overshot to lead the positive board, the drilling rod upper end of empting and the inner wall butt of leading the positive board, when leading the positive board along with the overshot continues downstream, the upper end of drilling rod will be along leading the inner wall incline direction of positive board to the direction of being close to the overshot axis around the drilling rod lower extreme point rotation, the inclination of drilling rod reduces like this and can enter into inside the overshot, the upper end of drilling rod and then can be close to the marginal below of the mutual butt of drilling rod cardboard more, the drilling rod can pass between two drilling rod cardboards more smoothly.
Preferably, a support plate is arranged at one end, close to the wall of the fishing cylinder, of the drill rod clamping plate, the support plate vertically penetrates through the side edge of the drill rod clamping plate, and the support plate is fixed on the wall of the fishing cylinder; run through the backup pad and be provided with cardboard round pin axle, cardboard round pin axle rotates with the backup pad to be connected, cardboard round pin axle's both ends and drilling rod cardboard fixed connection.
Through adopting above-mentioned technical scheme, when the drilling rod cardboard takes place to deflect, one side that the drilling rod cardboard is close to the fishing barrel section of thick bamboo wall will rotate around cardboard round pin axle dead axle.
Preferably, the side edge of the drill rod clamping plate close to the axis of the overshot is provided with a circular arc-shaped limiting hole for the drill rod to pass through.
Through adopting above-mentioned technical scheme, after the drilling rod passes between two drilling rod cardboard, the drilling rod enters into the clearance that two spacing holes enclose simultaneously, and spacing hole can hinder the drilling rod to take place the skew to empty at the in-process of upwards salvaging on the one hand, and on the other hand has increased the area of contact between global and the drilling rod cardboard of drilling rod, and then has increased the frictional force between drilling rod and the drilling rod cardboard, makes the drilling rod can more reliably be by the chucking between two drilling rod cardboards.
Preferably, the top of the overshot is provided with a guide hole for the drill rod to pass through the top of the overshot.
By adopting the technical scheme, when the drill rod is too long, the depth of the overshot cannot accommodate the drill rod, in order to enable the clamped stress point of the drill rod to be closer to the self centroid so as to enable the drill rod to be more reliably clamped, the guide hole enables the longer drill rod to pass through the top of the overshot, and the position of the rod body of the drill rod close to the self centroid can be closer to the drill rod clamping plate, so that the situation that the drill rod can only be clamped by the drill rod clamping plate at the position close to the upper end and is unstable due to too high length of the drill rod can be prevented; in addition, people can know the clamping condition of the drill rod through the guide hole.
Preferably, a guide plate is arranged inside the fishing barrel; the deflector is the bell mouth form that the opening is decurrent, and the upper end diameter of deflector equals guiding hole diameter and the upper end of deflector is connected with the roof of overshot.
By adopting the technical scheme, after the drill rod passes through the space between the two drill rod clamping plates, the drill rod needs to enter the interior of the guide hole, and if the drill rod is inclined to a certain degree, the drill rod cannot smoothly enter the interior of the guide hole, even the upper end of the drill rod abuts against the top wall of the interior of the overshot; through setting up the deflector, the drilling rod upper end that takes place the slope butts with the bulkhead of deflector, and when the drilling rod was close to the guiding hole, the upper end of drilling rod rotated to the axis direction that is close to the guiding hole along the bulkhead of deflector until in the guiding hole was slided into along the deflector.
Preferably, the fishing ropes are vertically provided with a plurality of fishing ropes, and the plurality of fishing ropes are arranged to avoid the guide holes and are uniformly distributed around the axis of the guide holes.
By adopting the technical scheme, the upward pulling force applied to the fishing barrel can be more uniform by uniformly distributing the fishing ropes around the axis of the guide hole, namely the fishing barrel can be pulled upwards more stably; the fishing rope avoids the guide hole, and reduces the interference of the fishing rope on the position of the drill rod passing through the guide hole.
Preferably, the lower end surface of the aligning plate is coaxially provided with an annular aligning portion, and the outer diameter of the aligning portion is equal to the diameter of the deep well.
Through adopting above-mentioned technical scheme, when the overshot reciprocated in the deep well inside, the outer peripheral face of positive position portion and the wall of a well laminating of deep well and slide on the wall of a well of deep well, and positive position portion can make the overshot reciprocate in the deep well inside more vertically, hinders that the overshot takes place to empty in the deep well inside.
In summary, the present application has the following technical effects:
1. by arranging the fishing barrel, the drill rod clamping plate and the fishing rope, workers do not need to enter the deep well in the fishing process of the drill rod, so that the drill rod is more convenient and quicker to fish, the labor intensity of fishing the drill rod is reduced, and the construction safety is improved;
2. by arranging the guide plate, the inclination angle of the drill rod can be reduced, the drill rod can enter the interior of the overshot, the upper end of the drill rod can be closer to the lower part of the mutually abutted edges of the drill rod clamping plates, and the drill rod can more smoothly pass through the space between the two drill rod clamping plates;
3. through seting up the guiding hole and setting up the deflector, when the drilling rod of slope is close to the roof of overshot, the deflector can play the guide effect for the upper end of drilling rod, and the upper end of drilling rod rotates until sliding into the guiding hole along the deflector along the slab wall of deflector to the axis direction that is close to the guiding hole, and then has reduced the upper end card of drilling rod and has died the possibility on the overshot roof.
Drawings
FIG. 1 is an external block diagram of a drill pipe overshot in an embodiment of the present application;
fig. 2 is an internal structural view of the drill pipe fisher in the embodiment of the present application.
In the figure, 1, an overshot; 2. a drill rod clamping plate; 3. a correcting plate; 4. a guide plate; 5. a support plate; 6. a pallet pin shaft; 7. a positive position part; 8. a limiting hole; 9. fishing the rope; 10. and (4) a guide hole.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
Referring to fig. 1 and 2, the application provides a clamp plate type drill rod fisher, which comprises a cylindrical overshot 1 with a vertical axis, wherein the overshot 1 is hollow and has a downward opening; two drill rod clamping plates 2 which are symmetrical about the axis of the overshot 1 are arranged inside the overshot 1, and the sides, far away from each other, of the drill rod clamping plates 2 are arranged close to the wall of the overshot 1 and hinged with the wall of the overshot 1; the length of the two clamping plates along the direction close to the axis of the overshot 1 and the diameter of the two clamping plates are larger than the diameter of the overshot 1, the clamping plates incline upwards along the direction from far away to close to the axis of the overshot 1, and the side edges, namely the upper ends, close to each other, of the two clamping plates are mutually abutted and attached; a plurality of fishing ropes 9 are fixed on the upper end surface of the fishing barrel 1, and the upper ends of the fishing ropes 9 extend to the outside of the deep well.
The drilling rod is positioned at the bottom of the deep well after being broken, when a broken drilling rod at the bottom of the deep well needs to be salvaged, the fishing barrel 1 is made to move towards the bottom of the deep well through the fishing rope 9 until the upper end of the drilling rod enters the fishing barrel 1, the fishing barrel 1 continues to move downwards through the fishing rope 9, the fishing barrel 1 and the drilling rod generate a relative movement trend, namely the drilling rod moves towards the interior of the fishing barrel 1 relatively, until the upper end of the drilling rod is abutted to the lower surfaces of the two drilling rod clamping plates 2, the fishing barrel 1 continues to move downwards, the drilling rod further moves towards the top of the fishing barrel 1, in the process, the upper end of the drilling rod acts an upward thrust on the drilling rod clamping plates 2, the mutually close side edges of the two drilling rod clamping plates 2 rotate upwards around the hinging shafts of the drilling rod clamping plates, and a gap for the drilling rod to pass through is generated between the mutually close side edges of the two drilling rod clamping plates 2 in the mutually far away direction; after the drill rod continues to move for a certain distance from the top of the overshot 1 relative to the overshot 1, the overshot 1 moves upwards through the fishing rope 9, at the moment, a movement trend of mutual deviation is generated between the drill rod and the overshot 1, namely the drill rod clamping plate 2, namely the drill rod moves downwards relative to the drill rod clamping plate 2, and because large friction force and extrusion force exist between the drill rod and the drill rod clamping plate 2, the friction force can prevent the drill rod and the drill rod clamping plate 2 from sliding relatively, and because the total length of the two drill rod clamping plates 2 is larger than the diameter of the overshot 1 and the drill rod is positioned between the two drill rod clamping plates 2 at the moment, the trend that the two drill rod clamping plates 2 prevent the drill rod from moving downwards is that the drill rod is clamped between the two drill rod clamping plates 2 at the moment; finally, the fishing barrel 1 and the drill rod clamped in the fishing barrel 1 are pulled out through the fishing rope 9; the salvaging of the broken drill rod is completed, the process does not require workers to enter the deep well, the drill rod is further convenient and fast to salvage, the labor intensity of the salvaging of the drill rod is reduced, and the construction safety is improved.
Furthermore, the drill rod clamping plate 2 is hinged with the cylinder wall of the overshot 1 through a pin shaft, namely a vertically arranged supporting plate 5 is arranged at one end, away from each other, of the drill rod clamping plate 2, the supporting plate 5 penetrates through the side edge of the drill rod clamping plate 2 in the vertical direction, and the supporting plate 5 is fixed on the cylinder wall of the overshot 1; a horizontal clamping plate pin shaft 6 penetrates through the surface of the supporting plate 5, the clamping plate pin shaft 6 is rotatably connected with the supporting plate 5, and two ends of the clamping plate pin shaft 6 are fixedly connected with the drill rod clamping plate 2; when two drilling rod cardboard 2 are close to one end upwards rotation each other, drilling rod cardboard 2 is close to the one end of 1 section of thick bamboo wall of overshot and is changeed around the axis dead axle of cardboard round pin axle 6.
Furthermore, arc-shaped limiting holes 8 for the drill rods to pass through are formed in the side edges, close to each other, of the drill rod clamping plates 2, and the circle centers of the limiting holes 8 are located outside the corresponding drill rod clamping plates 2; after the drilling rod passes between two drilling rod cardboard 2, the drilling rod enters into the clearance that two spacing holes 8 enclose simultaneously, and spacing hole 8 can hinder the drilling rod to take place the skew and empty at the in-process of upwards salvaging on the one hand, and on the other hand has increased the area of contact between global and the drilling rod cardboard 2 of drilling rod, and then has increased the frictional force between drilling rod and the drilling rod cardboard 2, makes the drilling rod can more reliably be by the chucking between two drilling rod cardboard 2.
The lower end face of the overshot 1 is coaxially provided with a guide plate 3, the guide plate 3 is in a bell mouth shape with a hollow inner part, the plate wall of the guide plate 3 inclines from top to bottom in the direction far away from the axis of the guide plate 3, and the upper end face of the guide plate 3 is fixedly connected with the lower end face of the overshot 1; when the drill rod is broken, the stability is poor due to the fact that the drill rod is long, and the upper end of the broken drill rod topples over; when the overshot 1 moves downwards, the correcting plate 3 also moves downwards along with the overshot until the plate wall of the correcting plate 3 is firstly abutted to the upper end of the toppled drill rod, and when the correcting plate 3 continues to move downwards, the upper end of the drill rod can continuously deflect along the plate wall of the correcting plate 3 in the direction close to the axis of the correcting plate 3 until the drill rod can enter the overshot 1 along the plate wall of the correcting plate 3; in addition, the upper end of drilling rod can be close to the marginal below of the mutual butt of drilling rod cardboard 2 more, and the drilling rod cardboard can more smoothly pass between two drilling rod cardboard 2.
Further, a cylindrical annular righting part 7 is coaxially arranged on the lower end face of the righting plate 3, and the upper end face of the righting part 7 is fixedly connected with the lower end face of the righting plate 3; the diameter of the outer peripheral surface of the righting part 7 is equal to that of the deep well, and in the process that the overshot 1 moves downwards, the outer peripheral surface of the righting part 7 is attached to the wall of the deep well and slides mutually; because the outer peripheral face diameter of positive portion 7 equals the diameter of deep well, therefore when positive portion 7 was arranged in the deep well, the axis of positive portion 7 and the axis collineation of deep well, because positive portion 7 and lead positive plate 3 promptly the axis collineation of overshot 1 again, consequently can make overshot 1 and deep well axis collineation, and then make overshot 1 can stretch into the deep well inside more vertically to hinder overshot 1 and take place to empty in the deep well is inside.
The top of the overshot 1 is coaxially provided with a guide hole 10, and a drill rod can pass through the top of the overshot 1 through the guide hole 10 and reach the upper part of the overshot 1; when the broken drill rod is long, along with the descending of the overshot 1, the upper end of the drill rod is continuously close to the top wall of the overshot 1 until the upper end of the drill rod is abutted to the top wall of the overshot 1, the centroid of the drill rod is far away from the drill rod clamping plate 2, namely the clamping stress point of the drill rod, and if the overshot 1 is taken out upwards, the rod section of the drill rod, which is positioned below the drill rod clamping plate 2, can swing to a large extent due to poor stability to cause instability; through seting up guiding hole 10, the upper end of longer drilling rod passes guiding hole 10 until the centroid of drilling rod is close to drilling rod cardboard 2 or is located the top of drilling rod cardboard 2, has reduced the drilling rod like this and has fallen the possibility of swing by a wide margin in overshot 1 inside, and the drilling rod can be salvaged more reliably steadily.
Further, a guide plate 4 positioned in the overshot 1 is arranged at the top of the overshot 1, and the guide plate 4 inclines from top to bottom in a direction away from the axis of the guide plate 4, namely the guide hole 10 is in a bell mouth shape with a hollow inner part; the diameter of the lower end of the guide plate 4 is equal to that of the overshot 1 and is fixedly connected with the wall of the overshot 1, and the diameter of the upper section of the guide plate 4 is equal to that of the guide hole 10 and is fixedly connected with the top wall of the overshot 1; after the drill rod passes through the space between the two drill rod clamping plates 2, if the inclination angle of the drill rod is smaller, the drill rod can smoothly pass through the guide hole 10; if drilling rod inclination is great, along with overshot 1's downstream, the upper end of drilling rod can with overshot 1's roof butt, overshot 1 continues to descend then can lead to the drilling rod to die overshot 1 and make overshot 1 unable downstream that continues, through setting up deflector 4, the upper end of the drilling rod of slope can slide to the guiding hole 10 inside along deflector 4's slope siding wall is automatic, reduced the drilling rod because the dead possibility of slope with overshot 1 card, and make the drilling rod upper end can get into guiding hole 10 more smoothly.
The fishing ropes 9 are vertically arranged, and the fishing ropes 9 are arranged to avoid the guide holes 10 and are uniformly distributed around the axis of the guide holes 10; the fishing ropes 9 are uniformly distributed around the axis of the guide hole 10, so that the upward pulling force applied to the fishing barrel 1 is more uniform, namely the fishing barrel 1 can be pulled upwards more stably; the fishing rope 9 avoids the guide hole 10, and the interference of the fishing rope 9 on the position of the drill rod passing through the guide hole 10 is reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The utility model provides a cardboard formula drilling rod fisher which characterized in that: the deep well dredging device comprises an overshot (1) with a downward opening, wherein the overshot (1) can enter the deep well; two drill rod clamping plates (2) are arranged inside the fishing barrel (1), and the drill rod clamping plates (2) are hinged with the barrel wall of the fishing barrel (1); the total length of the two drill rod clamping plates (2) along the direction close to the axis of the overshot (1) is greater than the diameter of the overshot (1), the two drill rod clamping plates (2) are inclined upwards, and the upper ends of the two clamping plates are mutually overlapped; the top of the fishing barrel (1) is provided with a fishing rope (9) extending to the outside of the deep well.
2. The chuck type drill rod fisher according to claim 1, wherein: the lower end face of the overshot (1) is coaxially provided with a guide plate (3), the guide plate (3) is hollow, the wall of the guide plate (3) inclines in a horn mouth shape from top to bottom in a direction away from the axis of the guide plate, and the diameter of the lower end of the guide plate (3) is equal to the diameter of a deep well.
3. The chuck type drill rod fisher according to claim 1, wherein: a supporting plate (5) is arranged at one end, close to the cylinder wall of the fishing cylinder (1), of the drill rod clamping plate (2), the supporting plate (5) vertically penetrates through the side edge of the drill rod clamping plate (2), and the supporting plate (5) is fixed on the cylinder wall of the fishing cylinder (1); run through backup pad (5) and be provided with cardboard round pin axle (6), cardboard round pin axle (6) are connected with backup pad (5) rotation, the both ends and drilling rod cardboard (2) fixed connection of cardboard round pin axle (6).
4. The chuck type drill rod fisher according to claim 1, wherein: the side edge of the drill rod clamping plate (2) close to the axis of the overshot (1) is provided with a circular arc-shaped limiting hole (8) for the drill rod to pass through.
5. The chuck type drill rod fisher according to claim 1, wherein: the top of the overshot (1) is provided with a guide hole (10) for the drill rod to pass through the top of the overshot (1).
6. The chuck type drill rod fisher according to claim 5, wherein: a guide plate (4) is arranged inside the overshot (1); the guide plate (4) is in a horn mouth shape with a downward opening, the diameter of the upper end of the guide plate (4) is equal to that of the guide hole (10), and the upper end of the guide plate (4) is connected with the top wall of the overshot (1).
7. The chuck type drill rod fisher according to claim 1, wherein: the fishing ropes (9) are vertically provided with a plurality of fishing ropes (9), and the fishing ropes (9) are arranged to avoid the guide holes (10) and are uniformly distributed around the axis of the guide holes (10).
8. The chuck type drill rod fisher according to claim 2, wherein: the lower end face of the guide plate (3) is coaxially provided with an annular positioning part (7), and the outer diameter of the positioning part (7) is equal to the diameter of the deep well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120378972.XU CN214741193U (en) | 2021-02-19 | 2021-02-19 | Clamping plate type drill rod fisher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120378972.XU CN214741193U (en) | 2021-02-19 | 2021-02-19 | Clamping plate type drill rod fisher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214741193U true CN214741193U (en) | 2021-11-16 |
Family
ID=78588958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120378972.XU Expired - Fee Related CN214741193U (en) | 2021-02-19 | 2021-02-19 | Clamping plate type drill rod fisher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214741193U (en) |
-
2021
- 2021-02-19 CN CN202120378972.XU patent/CN214741193U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211116 |
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| CF01 | Termination of patent right due to non-payment of annual fee |