CN202483434U - Eccentric casing drilling tool - Google Patents
Eccentric casing drilling tool Download PDFInfo
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- CN202483434U CN202483434U CN2012200579449U CN201220057944U CN202483434U CN 202483434 U CN202483434 U CN 202483434U CN 2012200579449 U CN2012200579449 U CN 2012200579449U CN 201220057944 U CN201220057944 U CN 201220057944U CN 202483434 U CN202483434 U CN 202483434U
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- reaming drill
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Abstract
The utility model relates to the field of machinery, in particular to an eccentric casing drilling tool. The torque of a pin can be reduced. The eccentric casing drilling tool comprises a centralizer, at least three eccentric expanding bits and central bits, wherein at least three bosses are uniformly distributed at the edge of the upper surface of the upper part of the centralizer; the bosses are provided with vertical grooves on the side face where the edge is positioned; the extension direction of the vertical grooves is parallel to the axial direction of the centralizer; the vertical grooves downwardly extend to the lower surface of the upper part of the centralizer and are arranged on the same side of the corresponding bosses; the bosses are provided with circular arc side faces which are opened towards pin holes of the centralizer; each eccentric expanding bit corresponds to one boss and is placed on the corresponding boss; two adjacent eccentric expanding bits are in contact with each other; the included angles of contact faces between the eccentric expanding bits are the same and the sum of the included angles is 360 degrees; the contact faces do not pass through the axis of the centralizer; the eccentric expanding bits rotate clockwise and then fall into gaps between adjacent bosses to be locked with the three bosses; parts of lateral surfaces of the eccentric expanding bits are in contact with the circular arc side faces; and the central bits are arranged on the three eccentric expanding bits.
Description
Technical field
The utility model relates to mechanical field, is specifically related to a kind of eccentric casing drilling tool.
Background technology
In existing eccentric casing drilling tool, the eccentric reaming drill bit adopts pivot pin to be connected with guider, and self-locking between a plurality of in use eccentric reaming drill bits prevents that the eccentric reaming drill bit from dropping.But this mode moment of torsion of pivot pin in use increases, and easy deformation when distortion is comparatively serious, then can influence the normal use of eccentric casing drilling tool.
The utility model content
Through the eccentric casing drilling tool that the utility model provides, can reduce the moment of torsion of pivot pin.
The utility model provides a kind of eccentric casing drilling tool, comprising:
Guider, eccentric reaming drill bit and center bit; Wherein,
Said guider; It has upper and lower two parts; The edge of the upper surface on said guider top has equally distributed at least three boss; All said boss offer vertical slot on the side at place, said edge, the bearing of trend of said vertical slot is parallel to the axial of said guider, and said vertical slot extends downward the soffit on said guider top; All said vertical slots lay respectively at the same side of corresponding boss, and each said boss has the circular arc side to the pin hole opening of said guider;
Said at least three eccentric reaming drill bits; Each said eccentric reaming drill bit is corresponding with a said boss; Said at least three eccentric reaming drill bits are positioned on the corresponding said boss, and adjacent two said eccentric reaming drill bits are in contact with one another, and the angle of the contact surface between all said eccentric reaming drill bits is identical; The summation of all said angles is 360 °, and all said contact surfaces are all without the axis of said guider; After turning clockwise, fall into the gap between adjacent said boss respectively, with said at least three mutual cutting ferrules of said boss, form lock-out state, the part side surface of said eccentric reaming drill bit and said circular arc flanked are touched;
Said center bit, it is arranged on said three eccentric reaming drill bits at least.
In each embodiment of the utility model, preferably, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/3rd said circular arc place circles.
In each embodiment of the utility model, preferably, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/4th said circular arc place circles.
In each embodiment of the utility model; Preferably; The same side of each said eccentric reaming drill bit has groove; When at least three eccentric reaming drill bits fell into the gap between adjacent said boss respectively after turning clockwise, at least three said grooves surrounded a class cylinder, and said type of cylinder and said guider are coaxial.
In each embodiment of the utility model, preferably, the upper surface of said center bit has abrasion-proof structure.
In each embodiment of the utility model, preferably, said abrasion-proof structure comprises one or more in wear-resistant block, wear rib, the wear plate.
In each embodiment of the utility model, preferably, said pin hole extends along being parallel to the soffit of said guider axial direction to said guider top.
In each embodiment of the utility model, preferably, have at least three lateral pin holes on the side on said guider top; Said at least three lateral pin holes are positioned on the same horizontal circumference and evenly and distribute; Each said lateral pin hole along continuous straight runs extends to said central axis, and each said lateral pin hole is communicated with corresponding said pin hole, and the lateral pin that cooperates with said lateral pin interporal lacuna is set in the said lateral pin hole; On the said lateral pin lock ring is set, said lock ring and said lateral pin hole interference fit.
Eccentric casing drilling tool through each embodiment of the utility model provides, can bring following beneficial effect:
Form self-locking through boss being set, can making between eccentric reaming drill bit and boss on guider, thereby reduced the moment of torsion of pivot pin, improved application life;
Through abrasion-proof structure is being set, can prevent the center bit wearing and tearing, prevent that center bit from damaging, and improved application life;
Through the lock ring of sealing is set on the lateral pin hole; Make lock ring with the pin hole interference fit, avoided when eccentric casing drilling tool is long-time when acutely shaking, lock ring comes off; Having guaranteed that guider, eccentric reaming drill bit and center bit are stable is connected, and prevents that eccentric reaming drill bit and center bit from coming off.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; Below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art; Obviously, the accompanying drawing in below describing only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 is the structural representation of the embodiment of the eccentric casing drilling tool of the utility model;
Fig. 2 is the structural representation of embodiment of the guider of the eccentric casing drilling tool of the utility model;
Fig. 3 is the structural representation of embodiment of the center bit of the eccentric casing drilling tool of the utility model;
Fig. 4 is the structural representation of embodiment of the eccentric reaming drill bit of the eccentric casing drilling tool of the utility model.
The specific embodiment
Below will combine accompanying drawing that the technical scheme of each embodiment of the utility model is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
The utility model provides a kind of eccentric casing drilling tool, comprising:
Guider, eccentric reaming drill bit and center bit; Wherein,
Said guider; It has upper and lower two parts; The edge of the upper surface on said guider top has equally distributed at least three boss; All said boss offer vertical slot on the side at place, said edge, the bearing of trend of said vertical slot is parallel to the axial of said guider, and said vertical slot extends downward the soffit on said guider top; All said vertical slots lay respectively at the same side of corresponding boss, and each said boss has the circular arc side to the pin hole opening of said guider;
Said at least three eccentric reaming drill bits; Each said eccentric reaming drill bit is corresponding with a said boss; Said at least three eccentric reaming drill bits are positioned on the corresponding said boss, and adjacent two said eccentric reaming drill bits are in contact with one another, and the angle of the contact surface between all said eccentric reaming drill bits is identical; The summation of all said angles is 360 °, and all said contact surfaces are all without the axis of said guider; After turning clockwise, fall into the gap between adjacent said boss respectively, with said at least three mutual cutting ferrules of said boss, form lock-out state, the part side surface of said eccentric reaming drill bit and said circular arc flanked are touched.
Should understand; Identical being of angle of the contact surface between all said eccentric reaming drill bits; Said eccentric casing drilling tool has at least three said eccentric reaming drill bits, is in contact with one another between two adjacent said eccentric reaming drill bits, and the face that they are in contact with one another extends; Two adjacent contact surfaces intersect, and the angle of adjacent two crossing contact surfaces is identical with angle between other adjacent two contact surfaces.
In one embodiment, when having three eccentric reaming drill bits, for example be the first eccentric reaming drill bit, the second eccentric reaming drill bit and the 3rd eccentric reaming drill bit; Contact with each other between three eccentric reaming drill bits, the first eccentric reaming drill bit and contacted of the second eccentric reaming drill bit are first, and the second eccentric reaming drill bit and contacted of the 3rd eccentric reaming drill bit are second; The 3rd eccentric reaming drill bit and contacted of the first eccentric reaming drill bit are the 3rd; Three faces are extended, first with second intersect, second intersects with the 3rd; The 3rd crossing with first; The angle of cut between these three friendship faces is identical, and and be 360 °, promptly each angle of cut is 120 °.For example to hand over the angle of face be 120 ° for the first friendship face 402 among Fig. 4, the second friendship face 403 and 404, three in the 3rd friendship face.
In one embodiment, same when having four eccentric reaming drill bits, have four friendship faces, each hands over the angle of cut of face identical, and and be 360 °, promptly each angle of cut is 90 °.
The part side surface and the said circular arc flanked that should be understood that said eccentric reaming drill bit are touched.After turning clockwise; Said eccentric reaming drill bit falls into the gap between two adjacent boss; This moment said eccentric reaming drill bit near the face of the circular arc side of said boss can with the circular arc contacts side surfaces of said boss, can play a fixing effect to the eccentric reaming drill bit after the contact.The contact surface among Fig. 1 106 for example, after turning clockwise, the eccentric reaming drill bit falls into the gap between two adjacent boss, and then the eccentric reaming drill bit is towards the face portion of the circular arc side of boss and the circular arc contacts side surfaces of boss.
Said center bit, it is arranged on said three eccentric reaming drill bits at least.
Said guider has upper and lower two parts, because said guider is a prior art, so do not do detailed description at this.Be evenly distributed to few three boss at the edge of the upper surface on said guider top.In one embodiment, at least three boss evenly distribute along the outward flange of the upper surface of guider.All said boss offer vertical slot on the side at place, said edge; Be that said boss overlaps with the extended surface of the side at place, said edge; Side on said guider top is provided with said vertical slot; Said vertical slot extends downward the soffit on said guider top, and promptly said vertical slot is to extending below and running through said guider top.All said vertical slots lay respectively at the same side of corresponding boss, and for example all said vertical slots all are positioned at left side or right side or other part of said boss, but all said vertical slots are identical with respect to the position of said boss.Said vertical slot is beneficial to row's powder.
Each said boss has to the circular arc side of the pin hole opening of said guider, and touch with the part flanked of corresponding said eccentric orfice drill bit said circular arc side, is convenient to the locking of said boss to said eccentric orfice drill bit.In one embodiment, the part side of eccentric orfice drill bit has the shape that matches with the circular arc side of boss.
Said at least three eccentric reaming drill bits, each said eccentric reaming drill bit is corresponding with a said boss, and said at least three eccentric reaming drill bits are positioned on the corresponding said boss.Should be understood that each said eccentric reaming drill bit is all corresponding with a said boss, when off working state, said eccentric reaming drill bit is positioned on the corresponding said boss.
The angle that should be understood that the contact surface between all said eccentric reaming drill bits is identical, and the summation of all said angles is 360 °, and all said contact surfaces are all without the axis of said guider; After turning clockwise, in the gap that is positioned over said boss that said eccentric reaming drill bit can be comparatively easy.
Should be understood that said eccentric reaming drill bit is a prior art, does not do detailed description at this.
Said center bit, it is arranged on said three eccentric reaming drill bits at least.
Should be understood that said eccentric reaming drill bit is a prior art, does not do detailed description at this.
Said at least three eccentric reaming drill bits are positioned over behind the clockwise direction Unscrew in three gaps between said boss at least, with said at least three mutual cutting ferrules of said boss, form lock-out state.
Should be understood that the side at said boss can be provided with the inclined-plane, is convenient to the relative motion of said eccentric reaming drill bit and said boss.
In each embodiment of the utility model, preferably, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/3rd said circular arc place circles.When the length of said circular arc was less than or equal to the girth of 1/3rd said circular arc place circles, effect was better.Can select the length of said circular arc according to concrete technology, for example the length of said circular arc for the girth of place circle 1/4th, 1/5th, sixth, 1/7th, eight/first-class.
In each embodiment of the utility model, preferably, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/4th said circular arc place circles.Can be better according to the length effect of concrete needs selection 1/4th.
In each embodiment of the utility model; Preferably; The same side of each said eccentric reaming drill bit has groove; When at least three eccentric reaming drill bits fell into the gap between adjacent said boss respectively after turning clockwise, at least three said grooves surrounded a class cylinder, and said type of cylinder and said guider are coaxial.Should be understood that said type cylinder has axially, said type of cylindrical axial and said guider axially identical.In one embodiment, said type cylindrical axially with said guider axially can be vertical direction.
In each embodiment of the utility model, preferably, the upper surface of said center bit has abrasion-proof structure.Said abrasion-proof structure can reduce the wearing and tearing of said center bit, prolongs the life-span of said center bit.Should be understood that said abrasion-proof structure can be cemented carbide structure.
In each embodiment of the utility model, preferably, said abrasion-proof structure comprises one or more in wear-resistant block, wear rib, the wear plate.Said abrasion-proof structure comprises wear-resistant block, wear rib, wear plate by various ways, can select one kind of multiple uses of arranging in pairs or groups wherein according to concrete technology.
In each embodiment of the utility model, preferably, said pin hole extends along being parallel to the soffit of said guider axial direction to said guider top.Can select according to concrete technology.
In each embodiment of the utility model, preferably, have at least three lateral pin holes on the side on said guider top; Said at least three lateral pin holes are positioned on the same horizontal circumference and evenly and distribute; Each said lateral pin hole along continuous straight runs extends to said central axis, and each said lateral pin hole is communicated with corresponding said pin hole, and the lateral pin that cooperates with said lateral pin interporal lacuna is set in the said lateral pin hole; On the said lateral pin lock ring is set, said lock ring and said lateral pin hole interference fit.
Should be understood that at drilling tool for a long time during violent shake that the lock ring through said sealing prevents coming off of pivot pin, simultaneously to the stressed cushioning effect that played of pivot pin, prevents the pivot pin fracture.
Because the self-locking shape of the mutual transfer torque that the said eccentric reaming drill bit that the utility model adopts and the boss on said guider top form; Compared with prior art; The self-locking area increases, and the stressed dispersion of pivot pin has effectively solved the drilling tool failure that is caused by the pivot pin distortion.
Because the said eccentric reaming drill bit that the utility model adopts is when opening, reaming position and said guider are isocentric circular arc, compared with prior art; Reaming face is stable, and is stressed even, reduces the impulse machine resistance; Circumference is broken feels relieved, and counter bore diameter is able to good assurance, and deslagging is unobstructed; Make the drilling rod of rig, the follow-up of sleeve pipe speeds up.
Because the utility model adopts the technical scheme of " lateral pin that cooperates with said lateral pin interporal lacuna being set; on the said lateral pin lock ring is set, said lock ring and said lateral pin hole interference fit in the said lateral pin hole ", compared with prior art; Even the violent for a long time shake of eccentric casing drilling tool; Lock ring is come off, guaranteed the fixing that is connected of said guider, eccentric reaming drill bit and center bit, thereby thoroughly solve the technical problem that off-balance bit and center bit drop.When unloading drilling tool, be screwed into screw in the screwed hole at lock ring center, turn clockwise, lock ring is withdrawed from first pin-and-hole, this technology is easy to loading and unloading;
Should be understood that and can adopt step center bit and eccentric reaming drill bit, so compared with prior art, step has reduced the contact area on drilling tool and ground, has reduced frictional force, effectively raises the rate of penetration of drilling tool, has improved drilling efficiency;
Because the utility model is provided with abrasion-proof structure at said center bit and extraneous contact surface, reduce the steel body wearing and tearing of eccentric reaming drill bit and center bit, prolonged the shelf life of drilling tool.
Eccentric casing drilling tool through each embodiment of the utility model provides, can bring following beneficial effect:
Form self-locking through boss being set, can making between eccentric reaming drill bit and boss on guider, thereby reduced the moment of torsion of pivot pin, improved application life;
Through abrasion-proof structure is being set, can prevent the center bit wearing and tearing, prevent that center bit from damaging, and improved application life;
Through the lock ring of sealing is set on the lateral pin hole; Make lock ring with the pin hole interference fit, avoided when eccentric casing drilling tool is long-time when acutely shaking, lock ring comes off; Having guaranteed that guider, eccentric reaming drill bit and center bit are stable is connected, and prevents that eccentric reaming drill bit and center bit from coming off.
In one embodiment of the invention, as shown in Figure 1, comprise center bit 101, eccentric reaming drill bit 102, guider 103, boss 104, vertical slot 105, contact surface 106.
Three eccentric reaming drill bits 102, each eccentric reaming drill bit 102 is corresponding with a boss 104.Before turning clockwise; Each eccentric reaming drill bit 102 all is placed on the corresponding boss 104; Adjacent two eccentric reaming drill bits 102 are in contact with one another; The angle of the contact surface that all eccentric reaming drill bits are 102 is identical, and the summation of all angles is 360 °, and all touch face all without the axis of guider 103; After turning clockwise, fall into the gap of 104 of adjacent lands respectively, with three boss, 104 mutual cutting ferrules, form lock-out state, the part side surface of eccentric reaming drill bit 102 and said circular arc flanked are touched, and promptly contact surface 106.
The all corresponding boss 104 of each eccentric reaming drill bit 102, eccentric reaming drill bit 102 is to prevent in the space that boss 104 is constituted like the state of Fig. 1 the time.
In one embodiment, as shown in Figure 2, Fig. 2 is the structural representation of the embodiment of guider, comprises, pin hole 202, lateral pin hole 203.
Three boss 201 evenly are arranged on the edge of the upper surface on guider top; Three boss 201 have the identical center of circle with the curve that the upper surface on guider top intersects with corresponding pin hole 202 towards the curved surface of pin hole 202, and boss 201 is towards curved surface the extending axially along guider of pin hole 202.Pin hole 202 along guider axially to extending below, three lateral pin holes 203 with the axial perpendicular circumference of guider on evenly distribute, lateral pin hole 203 is towards the central axis horizontal-extending of guider, and is communicated with corresponding pin hole 202.
In one embodiment, as shown in Figure 3, comprise abrasion-proof structure 301 and center bit 302, a plurality of abrasion-proof structures 301 are arranged on the center bit 302.
In one embodiment, as shown in Figure 4, be three eccentric reaming drill bits 401 after rotation, columniform situation is formed in the center.
The first friendship face 402, the second friendship face 403 and the 3rd friendship face 404 are the face that is in contact with one another between three eccentric reaming drill bits; The first friendship face 402, the second friendship face 403 and the 3rd friendship face 404 are extended; Angle between angle, the 3rd friendship face 404 and the first friendship face 402 between angle, the second friendship face 403 and the 3rd friendship face 404 between the first friendship face 402 and the second friendship face 403 is identical, and each angle is 120 °.
Eccentric casing drilling tool through each embodiment of the utility model provides, can bring following beneficial effect:
Form self-locking through boss being set, can making between eccentric reaming drill bit and boss on guider, thereby reduced the moment of torsion of pivot pin, improved application life;
Through abrasion-proof structure is being set, can prevent the center bit wearing and tearing, prevent that center bit from damaging, and improved application life;
Through the lock ring of sealing is set on the lateral pin hole; Make lock ring with the pin hole interference fit, avoided when eccentric casing drilling tool is long-time when acutely shaking, lock ring comes off; Having guaranteed that guider, eccentric reaming drill bit and center bit are stable is connected, and prevents that eccentric reaming drill bit and center bit from coming off.
The various embodiment that the utility model provides can make up with any-mode as required each other, and the technical scheme that obtains through this combination is also in the scope of the utility model.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also comprises these changes and modification interior.
Claims (8)
1. an eccentric casing drilling tool is characterized in that, comprising: guider, eccentric reaming drill bit and center bit; Wherein,
Said guider; It has upper and lower two parts; The edge of the upper surface on said guider top has equally distributed at least three boss; All said boss offer vertical slot on the side at place, said edge, the bearing of trend of said vertical slot is parallel to the axial of said guider, and said vertical slot extends downward the soffit on said guider top; All said vertical slots lay respectively at the same side of corresponding boss, and each said boss has the circular arc side to the pin hole opening of said guider;
Said at least three eccentric reaming drill bits; Each said eccentric reaming drill bit is corresponding with a said boss; Said at least three eccentric reaming drill bits are positioned on the corresponding said boss, and adjacent two said eccentric reaming drill bits are in contact with one another, and the angle of the contact surface between all said eccentric reaming drill bits is identical; The summation of all said angles is 360 °, and all said contact surfaces are all without the axis of said guider; After turning clockwise, fall into the gap between adjacent said boss respectively, with said at least three mutual cutting ferrules of said boss, form lock-out state, the part side surface of said eccentric reaming drill bit and said circular arc flanked are touched;
Said center bit, it is arranged on said three eccentric reaming drill bits at least.
2. eccentric casing drilling tool as claimed in claim 1 is characterized in that, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/3rd said circular arc place circles.
3. eccentric casing drilling tool as claimed in claim 2 is characterized in that, the length of the circular arc that the upper surface on said circular arc side and said guider top intersects is less than or equal to the girth of 1/4th said circular arc place circles.
4. like each described eccentric casing drilling tool among the claim 1-3; It is characterized in that; The same side of each said eccentric reaming drill bit has groove; When at least three eccentric reaming drill bits fell into the gap between adjacent said boss respectively after turning clockwise, at least three said grooves surrounded a class cylinder, and said type of cylinder and said guider are coaxial.
5. like each described eccentric casing drilling tool among the claim 1-3, it is characterized in that the upper surface of said center bit has abrasion-proof structure.
6. eccentric casing drilling tool as claimed in claim 5 is characterized in that said abrasion-proof structure comprises one or more in wear-resistant block, wear rib, the wear plate.
7. like each described eccentric casing drilling tool among the claim 1-3, it is characterized in that said pin hole extends along being parallel to the soffit of said guider axial direction to said guider top.
8. eccentric casing drilling tool as claimed in claim 7; It is characterized in that; Have at least three lateral pin holes on the side on said guider top, said at least three lateral pin holes are positioned on the same horizontal circumference and evenly and distribute, and each said lateral pin hole along continuous straight runs extends to said central axis; Each said lateral pin hole is communicated with corresponding said pin hole; The lateral pin that cooperates with said lateral pin interporal lacuna is set in the said lateral pin hole, on the said lateral pin lock ring is set, said lock ring and said lateral pin hole interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200579449U CN202483434U (en) | 2012-02-21 | 2012-02-21 | Eccentric casing drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200579449U CN202483434U (en) | 2012-02-21 | 2012-02-21 | Eccentric casing drilling tool |
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| Publication Number | Publication Date |
|---|---|
| CN202483434U true CN202483434U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200579449U Expired - Fee Related CN202483434U (en) | 2012-02-21 | 2012-02-21 | Eccentric casing drilling tool |
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| CN (1) | CN202483434U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790519A (en) * | 2014-02-17 | 2014-05-14 | 广汉市井管厂 | Centrifugal flail block casing drilling tool and assembly method thereof |
| CN106639914A (en) * | 2016-12-08 | 2017-05-10 | 长沙黑金刚实业有限公司 | Eccentric casing drilling tool |
| CN110439467A (en) * | 2019-07-30 | 2019-11-12 | 长沙天和钻具机械有限公司 | A kind of reaming block formula concentric simultaneous casing drilling tool |
-
2012
- 2012-02-21 CN CN2012200579449U patent/CN202483434U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790519A (en) * | 2014-02-17 | 2014-05-14 | 广汉市井管厂 | Centrifugal flail block casing drilling tool and assembly method thereof |
| CN103790519B (en) * | 2014-02-17 | 2015-12-30 | 广汉市井管厂 | A kind of centrifugal block for clutch use casing drilling tool and assembly method thereof |
| CN106639914A (en) * | 2016-12-08 | 2017-05-10 | 长沙黑金刚实业有限公司 | Eccentric casing drilling tool |
| CN110439467A (en) * | 2019-07-30 | 2019-11-12 | 长沙天和钻具机械有限公司 | A kind of reaming block formula concentric simultaneous casing drilling tool |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20140221 |