CN203248081U - Wide insert cone bit - Google Patents
Wide insert cone bit Download PDFInfo
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- CN203248081U CN203248081U CN 201320092025 CN201320092025U CN203248081U CN 203248081 U CN203248081 U CN 203248081U CN 201320092025 CN201320092025 CN 201320092025 CN 201320092025 U CN201320092025 U CN 201320092025U CN 203248081 U CN203248081 U CN 203248081U
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Abstract
The utility mode discloses a wide insert cone bit, and belongs to the technical field of drilling equipment of petroleum and gas, mine engineering, building fundamental building foundation, geology, hydrology and the like. The wide insert cone bit comprises a bit body and at least one cone, teeth are mounted on the at least one cone in an embedded mode, the teeth are wide insert teeth, the quadrant of the tooth crest width of the teeth is larger than or equal to the width of tooth columns of the teeth, and the cross sections of the tooth columns of the teeth are noncircular. According to the wide insert cone bit with a wide tooth crest structure, the stratum adaptability of the bit is enlarged, the service life of the bit teeth and the service life of the bit are prolonged at the same time, and the wide insert cone bit has obvious advantage especially in drilling of soft stratums.
Description
Technical field
The utility model belongs to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relates to concretely a kind of rock bit.
Background technology
Drill bit be in the drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Rock bit is rock crushing tool commonly used in the drilling engineering.Tricone bit is mainly to impact the form fractured rock of crushing, and namely tooth cuts fractured rock by scraping to the impact of rock, extruding with a small amount of slippage.At present employed tricone bit comprises steel-tooth bit (claim not only mill tooth bit) and tungsten carbide insert bit (but also claiming tungsten carbide insert bit) in the drilling engineering.The mill teeth rock bit is directly to mill out cutting teeth on the gear wheel base substrate, and the cutting teeth material is identical with the cone body material, is generally steel material, and the intensity of tooth is lower, abrasion resistance is relatively poor, generally is used for soft formation.Because the size of tooth large (addendum width and proud exposure are all larger), so mill tooth bit is high at the middle efficiency of breaking rock of creeping into of soft formation; But because the restriction of cutting teeth material, Strength Failure and wear out failure easily occur in Cutter.For improving the abrasion resistance of cutting teeth, generally to carry out intensive treatment on the steel-tooth surface, or apply the weldering antifriction alloy to improve its surface strength and abrasion resistance, but surface strengthen layer or deposited layer thickness after processing are limited, still not as good as carbide alloy, the steel-tooth after the processing is compared with the carbide alloy tooth and is still had larger gap for surface strength and abrasion resistance.The cutting teeth life-span of mill teeth rock bit is not high, has limited its application life and the application in hard or stratum that abrasiveness is strong thereof.With the inlaid solid carbide alloy tooth of the modes such as interference fit or welding (hereinafter to be referred as hard-metal insert or tooth), the hardness of hard-metal insert and abrasion resistance obviously are better than steel-tooth to tungsten carbide insert bit in the perforation that cone body is reserved, general being used for than hard formation.The tooth size of insert bit less (particularly addendum width is little), and its addendum width all is significantly less than the diameter of the inlaid solid part in bottom, and formed more sharp-pointed tooth head can adapt to the broken rock than hard formation preferably.But because tooth size is little, insert bit is in the obviously too late mill teeth rock bit of the drilling efficiency of soft formation.And, in Practical Project, complex formation is changeable, be not single soft formation or hard formation, and the common staggered stratum of stratum, soft or hard and the heterogeneity stratum that has hard interbedded layer, in this case, existing steel-tooth bit (claim not only mill tooth bit) and tungsten carbide insert bit (but also claiming tungsten carbide insert bit) result of use are all had a greatly reduced quality.
The utility model content
The purpose of this utility model is: a kind of wide tooth top insert bit is provided, and this drill bit in the application life that can improve drill teeth and drill bit, particularly has obvious advantage in the creeping into of soft formation when enlarging the drill bit ground adaptability.
The utility model is that the technical scheme that adopts that achieves the above object is:
A kind of wide insert bit comprises bit body, at least one gear wheel, is installed with tooth on the described gear wheel, and described tooth is wide inserted, and its 4 minutes addendum widths are more than or equal to its tooth post width, and the cross-sectional outling of its tooth post is non-circular.
The structure of tooth is one of key factor that affects roller bit cutting efficient.The tooth of insert bit and the perforation on the gear wheel adopt interference fit (or welding-on etc.) mode to be inlaid solid on the gear wheel usually.The bottom of tooth and cutter teeth hole form interference fit (this part is called inlaid solid part or the tooth post of tooth), and the surface that tooth and perforation form interference fit is generally the face of cylinder; The top exposure of tooth partly is positioned at outside the surface of cone shell, be used for directly contact, (this part is called the working portion of tooth to fractured rock, be also referred to as bizet or the head of tooth), generally, radially (perpendicular to the tooth axis direction, the diametric(al) of parallel tooth lower cylindrical) size of tooth bizet is less than the body diameter of inlaid solid part.The size of the inlaid solid part of tooth (diameter and height) and the magnitude of interference are the keys that determines permanent tooth intensity, and the shape and size of tooth bizet then are the keys that determines the tooth service behaviour.Usually so-called " flute profile " or " profile of tooth " classification with regard to referring to according to the feature of tooth corona shape and size tooth be done.Common tooth flute profile (or profile of tooth) comprises hemi-spherical ended shape insert, conical tooth, chisel teeth, scoop chisel insert, eccentric scoop chisel insert, wedge crested chisel insert etc.
The major parameter that characterizes tooth corona shape and size is that the proud exposure h of tooth, the addendum width W of tooth and the addendum thickness T(of tooth see Figure 19).Proud exposure h refers to the height of tooth exposure outside the cone shell surface, is called for short proud exposure or tooth depth; Addendum width is called for short perpendicular to the maximum transverse size in the plane of tooth axis in the tooth top zone that the addendum width W of tooth refers to tooth; The thickness T of tooth refers to tooth tooth top zone in the maximum transverse size perpendicular to the tooth width direction, is called for short addendum thickness.Addendum width and addendum thickness have represented the lateral dimension at tooth top, and lateral dimension is less, more sharp-pointed, the easier intrusion rock of tooth, but also easier generation Strength Failure simultaneously, and the tooth abrasion resistance is also lower.With regard to regard to the impact of tooth efficiency of breaking rock, the width of tooth has more special meaning, reason is: although rock bit is mainly with the granulitization fractured rock, but the relative sliding motion of drill teeth when contacting with rock can make tooth produce and scrape the effect of cutting brokenly rock, at this moment, the width of tooth is larger, and it is just larger to scrape area inswept when cutting, and it is also just more obvious to scrape the effect of cutting broken rock.
Yet, because the particularity of tooth corona shape, the concept of tooth " tooth top zone " has certain ambiguity, thereby needs in addition concrete agreement, can both be according to unified method tolerance addendum width and the purpose of addendum thickness to the tooth of various shapes to reach.For this reason, the spy does agree as follows: N is a natural number, vertically doing a plane P perpendicular to the tooth axis (seeing Figure 19) apart from the position of tooth bizet peak h/N, is that the N of tooth divides the tooth top zone by this plane to the zone between the tooth bizet peak on the tooth.Within the N of tooth divides the tooth top zone, perpendicular to the maximum transverse size of tooth axis, for the N of tooth divides addendum width (also namely: the N of tooth divides the Breadth Maximum of tooth top zone projection on plane P); Maximum transverse size corresponding direction on the P plane is tooth top facewidth direction; This tooth top zone is perpendicular to the maximum transverse size on the addendum width direction, for the N of tooth divides addendum thickness.In Figure 19,4 minutes tooth top zones (zone between the peak of P plane to tooth top) of chisel teeth, 4 minutes addendum width W, addendum width direction and 4 minutes addendum thickness T have been indicated.Generally, the shape of tooth bizet all is more and more sharp-pointed to the top by root, so the tooth cross-sectional width/thickness on plane P divides addendum width/thickness with regard to the N that equals tooth.
The top exposure part of the tooth on the existing insert bit is from the lower teeth post and begins the pointed nose that upwards shrinks gradually, and the addendum width of tooth all is significantly less than the diameter of lower teeth post.Tooth in the utility model has long addendum width, and 4 minutes addendum widths of tooth are all more than or equal to the width of tooth lower teeth post, and is called the tooth of the long addendum width of this kind wide inserted.Adopt wide insertedly on the wide insert bit, and the cross section of wide inserted tooth post (being the inlaid solid part in bottom) is non-circular.Laterally (vertical tooth short transverse) maximum size of wide inserted tooth post is the length of tooth post, and the maximum transverse size of vertical length direction is the width (such as Fig. 5, L1 is the length of tooth post, and W1 is the width of tooth post) of tooth post.The wide inserted 4 minutes addendum widths of the utility model are more than or equal to the width of its tooth post, and wide inserted addendum width and exposure size are all larger, can the Effective Raise drill bit at the efficiency of breaking rock than incompetent bed.The cross section of this kind tooth post is non-circular wide inserted, the tooth top width of its top exposure part can design very longly along the length direction of lower teeth post, tooth top width can obviously be longer than conventional inserted, and the length of lower teeth post can be the lengthening that adapts to tooth top width and lengthens, and tooth post cross section is non-circularly to provide convenience and condition for adding the tooth top width that teethes.When tooth top exposure part is stressed with the rock effect, the tooth of longer addendum width is uneven along the stressed possibility on the addendum width direction, the non-circular tooth post in the cross section of corresponding lengthening can effectively be born the load with balanced tooth exposure part, improve the stress distribution of tooth, thereby improve tooth intensity and inlaid solid reliability.
Press such scheme, described wide inserted material is carbide alloy, or diamond does the carbide alloy composite teeth that the surface is strengthened, or the impregnated with diamond cutting teeth etc.
The beneficial effect of the utility model patent is:
(1) employing is wide inserted on the bit cone, and wide inserted tooth post cross-sectional outling is non-circular, and wide inserted addendum width is large; Wide inserted on the gear wheel is inserted, the wide inserted material different from cone body of selecting, as the hard-metal insert, the diamond that adopt hardness and abrasion resistance all to be much better than the gear wheel material are done the carbide alloy composite teeth that the surface is strengthened, or impregnated with diamond cutting teeth etc., the abrasion resistance of these teeth and hardness etc. are all apparently higher than the cutting teeth of conventional milling tooth roller drill bit.The utility model had both had larger addendum width and exposure size, simultaneously also had stronger intensity and abrasion resistance, and tooth life and drill bit efficiency of breaking rock all will obviously improve, particularly than soft formation, drill bit service behaviour can obviously be promoted.
(2) the utility model adopts wide insertedly, has enlarged the stratum accommodation of drill bit, drill bit can be applied to particularly widen the application of drill bit in the stratum that has hard interbedded layer, the staggered stratum of soft or hard and heterogeneity stratum than the creeping into of hard formation.The utility model adopts the wide inserted compliance that strengthens the drill bit stratum, has improved the drilling efficiency of drill bit, can reduce drilling cost.
(3) the wide inserted of the utility model employing has larger addendum width and exposure size, but compares the shaft bottom coverage scale of Effective Raise drill bit with traditional tungsten carbide insert bit, and then improves the drill bit efficiency of breaking rock.
As preferably, described wide 4 minutes inserted addendum widths are more than or equal to its tooth column length.
In the such scheme, take full advantage of wide inserted tooth column length, increase wide inserted addendum width along the tooth column length, can take full advantage of and bring into play the above-mentioned beneficial effect of wide tungsten carbide insert bit.When wide inserted addendum width equaled its tooth column length, wide inserted lower teeth column dimension and top exposure were measure-alike, are conducive to wide inserted machine-shaping.Wide inserted 4 minutes addendum width W further break through the inertial thinking of the sharp-pointed form of prior art tooth greater than the length L 1 of tooth post, form a up big and down small similar mushroom.The wide inserted of this structure is conducive to wide tungsten carbide insert bit in the raising than the soft formation drilling efficiency, can be issued to the purpose that increases addendum width in the prerequisite that does not increase inlaid solid portion size, cutter teeth hole dimension simultaneously, it has also guaranteed the intensity of cone shell when having guaranteed the inlaid solid reliability of tooth.
As further preferred, described wide 4 minutes inserted addendum widths are not less than 1.2 times of its tooth post width.
As further preferred, described wide 4 minutes inserted addendum widths are not less than 1.5 times of its tooth post width.
As further preferred, described wide inserted lower teeth post and top exposure part are through step transition.
Wide inserted through step transition of this lower teeth post and top exposure part in the such scheme, its step surface can be sat on the aperture face that is pressed in the gear wheel perforation, axial compression when making tooth work is born by perforation aperture face, is no longer born by the low cone shell of perforation.Like this, the load that acts on cone shell during tooth work will be improved greatly, can obviously improve the load distribution consistency degree of cone body and the reliability and safety of housing; Or, can reduce at the bottom of the gear wheel perforation hole and the thickness between the gear wheel inner bearing hole, thereby increase the size in gear wheel inner bearing hole, namely increase the size of gear wheel inner bearing, improve intensity and the application life of gear wheel bearing, and then prolong drilling life of bit.
As further preferred, described wide inserted lower teeth post and the transition of top exposure partial arc.
As preferably, the shape of cross section of described wide inserted tooth post is the round rectangle of two semicircle.
In the such scheme, wide inserted tooth post cross section is the round rectangle of two semicircle, is conducive to the processing of corresponding perforation on the machine-shaping of wide inserted tooth post and the gear wheel.
As preferably, the shape of cross section of described wide inserted tooth post is oval.
In the such scheme, wide inserted tooth post cross section is oval, is conducive to the processing of corresponding perforation on the machine-shaping of wide inserted tooth post and the gear wheel, and oval tooth post profile and perforation also are convenient to realize the modern digital machine, process workable.
As preferably, the cross-sectional profiles of described wide inserted tooth post intersects the outline that consists of by at least two circles and forms.
In the such scheme, the cross-sectional profiles of wide inserted tooth post intersects the outline consist of by a plurality of circles and forms, and its corresponding perforation shape also be that a plurality of circles intersect and consist of, and it is convenient to processing (such as brill or the mill etc.) moulding of tooth tooth post and perforation, and processing technology is good; The circular arc position is the position that fits tightly of tooth post and perforation, is easy to guarantee shape, size and the tolerance fit precision of tooth post, perforation, is convenient to the control of use level between tooth tooth post and perforation, improves the inlaid solid intensity of tooth and reliability.
As further preferred, the shape of cross section of described wide inserted tooth post is three circle fusiformis, and namely tooth post cross-sectional profiles is mainly intersected by three circles and forms, and the radius of middle circle (arc) is greater than the radius of both sides circles (arc), form a fusiformis, the corresponding perforation of tooth post also is three circle fusiformis.This preferred version is except having above-mentioned beneficial effect, and tooth is all stronger in bending resistance and the permanent tooth intensity of addendum thickness direction.
As preferably, the cross-sectional profiles of described wide inserted tooth post is connected and composed via straightway or curved section (preferred circular arc) by at least two circular arcs.
As further preferred, the cross-sectional profiles of described wide inserted tooth post is the both sides major arc, and intermediate curve section (preferred circular arc) or straightway are formed by connecting.
As preferably, described wide inserted be the carbide alloy tooth, or diamond does the carbide alloy composite teeth that the surface is strengthened, or impregnated with diamond tooth etc.
Description of drawings
Fig. 1 is the structural representation of a kind of wide insert bit of the utility model.
Fig. 2 is the top view (view when seeing along the contrary drill bit drilling direction of drill axis) of structure drill bit shown in Figure 1.
Fig. 3 is the wide inserted shaft bottom cloth tooth coverage diagram radially of the wide insert bit of the utility model.
Fig. 4 is that the shape of cross section of wide inserted tooth post of the present utility model is a kind of wide inserted tooth structure schematic diagram of the round rectangle of two semicircle.
Fig. 5 is wide inserted schematic diagram when seeing at the bottom of from the tooth top to tooth along the tooth axis shown in Figure 4.
Fig. 6 is shown in Figure 4 wide inserted inlaid solid behind the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.
Fig. 7 be shown in Figure 4 wide inserted be fixed in the gear wheel perforation after, the partial sectional view when dissecing along the cross section of tooth lower teeth post.
Fig. 8 is that the shape of cross section of wide inserted tooth post of the present utility model is oval-shaped a kind of wide inserted tooth structure schematic diagram.
Fig. 9 is wide inserted schematic diagram when seeing at the bottom of from the tooth top to tooth along the tooth axis shown in Figure 8.
Figure 10 is a kind of wide inserted tooth structure schematic diagram that wide inserted tooth column length of the present utility model equals wide inserted 4 minutes addendum widths.
Figure 11 is wide inserted schematic diagram when seeing at the bottom of from the tooth top to tooth along the tooth axis shown in Figure 10.
Figure 12 be wide inserted tooth column length of the present utility model less than wide inserted 4 minutes addendum widths, lower teeth post and top exposure part is through a kind of wide inserted tooth structure schematic diagram of step transition.
Figure 13 is wide inserted schematic diagram when seeing at the bottom of from the tooth top to tooth along the tooth axis shown in Figure 12.
Figure 14 is shown in Figure 12 wide inserted inlaid solid behind the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.
Figure 15 be wide inserted tooth column length of the present utility model less than wide inserted 4 minutes addendum widths, a kind of wide inserted tooth structure schematic diagram of lower teeth post and the transition of top exposure partial arc.
Figure 16 is wide inserted schematic diagram when seeing at the bottom of from the tooth top to tooth along the tooth axis shown in Figure 15.
Figure 17 is that tooth post cross-sectional profiles is the wide inserted tooth post cross-sectional profiles schematic diagrames of three circles during fusiformis.
Figure 18 is that tooth post cross-sectional profiles is the wide inserted tooth post cross-sectional profiles schematic diagram that the middle circular arc of both sides major arc or straightway are formed by connecting.
Figure 19 is the schematic diagram of 4 minutes addendum width W of tooth as an example of chisel teeth example and thickness T.
Among the figure: 1, bit body, 2, gear wheel, 3, wide inserted, 31, the tooth post.
The specific embodiment
Following non-limiting examples is used for explanation the utility model.
Embodiment 1:
Shown in Fig. 1 to 7, a kind of wide insert bit comprises that bit body 1, at least one gear wheel 2(are such as three gear wheels etc.), be installed with wide inserted by 3 on the gear wheel 2, wide inserted 3 are preferably the carbide alloy tooth, or diamond does the carbide alloy composite teeth that the surface is strengthened, or the impregnated with diamond tooth etc.The cross-sectional outling of wide inserted 3 tooth post 31 is non-circular, and as preferably, the shape of cross section of wide inserted 3 tooth post 31 is the round rectangle of two semicircle, and 4 minutes addendum widths of wide inserted 3 are more than or equal to its tooth post width.Preferably, 4 minutes addendum widths of wide inserted 3 are not less than 1.2 times of its tooth post width, and more preferably 4 minutes addendum widths of wide inserted 3 are not less than 1.5 times of its tooth post width.
Embodiment 2:
Shown in Fig. 8,9, a kind of wide insert bit comprises that bit body 1, at least one gear wheel 2(are such as three gear wheels etc.), be installed with wide inserted by 3 on the gear wheel 2, wide inserted 3 are preferably the carbide alloy tooth, or diamond does the carbide alloy composite teeth that the surface is strengthened, or the impregnated with diamond tooth etc.The cross-sectional outling of wide inserted 3 tooth post 31 is non-circular, and as preferably, the cross-sectional profiles of wide inserted 3 tooth post 31 is shaped as ellipse, and 4 minutes addendum widths of wide inserted 3 are more than or equal to its tooth post width.Preferably, 4 minutes addendum widths of wide inserted 3 are not less than 1.2 times of its tooth post width, and more preferably 4 minutes addendum widths of wide inserted 3 are not less than 1.5 times of its tooth post width.
Embodiment 3:
Present embodiment and embodiment 1 or 2 are basic identical, and its difference is: 4 minutes addendum widths of wide inserted 3 are more than or equal to its tooth column length.Shown in Figure 10,11, illustrate wide inserted 3 tooth column lengths and equal wide inserted 4 minutes addendum widths.
Embodiment 4:
Shown in Figure 12,13,14, present embodiment is substantially the same manner as Example 3, and its difference is: wide inserted 3 lower teeth post 31 and top exposure part are through step transition.
Embodiment 5:
Shown in Figure 15,16, present embodiment is substantially the same manner as Example 3, and its difference is: wide inserted 3 lower teeth post 31 and the transition of top exposure partial arc.
Embodiment 6:
Shown in Figure 17,18, present embodiment and embodiment 1-5 are basic identical, and its difference is: the cross-sectional outling of wide inserted 3 lower teeth post 31 intersects the outline that consists of by at least two circles and forms.Such as Figure 17, the shape of cross section of wide inserted 3 tooth post 31 is three circle fusiformis, and namely the cross-sectional profiles of tooth post 31 is mainly intersected by three circles and forms, and the radius of middle circle (arc) forms a fusiformis greater than the radius of both sides circles (arc).
Embodiment 7:
Present embodiment and embodiment 1-5 are basic identical, and its difference is: the cross-sectional profiles of wide inserted 3 tooth posts 31 is connected and composed via straightway or curved section (preferred circular arc) by at least two circular arcs.Preferably, the cross-sectional profiles of wide inserted 3 tooth posts 31 is the both sides major arc, and intermediate curve section (preferred circular arc) or straightway are formed by connecting.Such as Figure 18, the cross-sectional outling of wide inserted 3 tooth post 31 is formed by connecting by circular arc in the middle of the major arc of both sides or straightway.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. a wide insert bit comprises bit body, at least one gear wheel, is installed with tooth on the described gear wheel, it is characterized in that: described tooth is wide inserted, and its 4 minutes addendum widths are more than or equal to its tooth post width, and the cross-sectional outling of its tooth post is non-circular.
2. wide insert bit as claimed in claim 1, it is characterized in that: described wide 4 minutes inserted addendum widths are more than or equal to its tooth column length.
3. wide insert bit as claimed in claim 2 is characterized in that: described wide inserted lower teeth post and top exposure part are through step transition.
4. wide insert bit as claimed in claim 1, it is characterized in that: the shape of cross section of described wide inserted tooth post is the round rectangle of two semicircle.
5. wide insert bit as claimed in claim 1 is characterized in that: the shape of cross section of described wide inserted tooth post is for oval.
6. wide insert bit as claimed in claim 1 is characterized in that: the cross-sectional profiles of described wide inserted tooth post intersects the outline that consists of by at least two circles and forms.
7. wide insert bit as claimed in claim 6 is characterized in that: the shape of cross section of described wide inserted tooth post is three circle fusiformis.
8. wide insert bit as claimed in claim 1, it is characterized in that: the cross-sectional profiles of described wide inserted tooth post is connected and composed via straightway or curved section by at least two circular arcs.
9. wide insert bit as claimed in claim 8, it is characterized in that: the cross-sectional profiles of described wide inserted tooth post is the both sides major arc, and intermediate curve section or straightway are formed by connecting.
10. the wide insert bit described in arbitrary claim in the claim 1 to 9 is characterized in that: describedly widely insertedly be the carbide alloy tooth, or diamond does the carbide alloy composite teeth that the surface is strengthened, or the impregnated with diamond tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092025 CN203248081U (en) | 2013-02-28 | 2013-02-28 | Wide insert cone bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092025 CN203248081U (en) | 2013-02-28 | 2013-02-28 | Wide insert cone bit |
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| Publication Number | Publication Date |
|---|---|
| CN203248081U true CN203248081U (en) | 2013-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320092025 Expired - Lifetime CN203248081U (en) | 2013-02-28 | 2013-02-28 | Wide insert cone bit |
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| Country | Link |
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| CN (1) | CN203248081U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132912A (en) * | 2013-02-28 | 2013-06-05 | 西南石油大学 | Wide insert cone bit |
| CN103883256A (en) * | 2014-04-16 | 2014-06-25 | 国强建设集团有限公司 | Multi-roller drill |
-
2013
- 2013-02-28 CN CN 201320092025 patent/CN203248081U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132912A (en) * | 2013-02-28 | 2013-06-05 | 西南石油大学 | Wide insert cone bit |
| CN103132912B (en) * | 2013-02-28 | 2015-11-18 | 西南石油大学 | A kind of wide insert bit |
| CN103883256A (en) * | 2014-04-16 | 2014-06-25 | 国强建设集团有限公司 | Multi-roller drill |
| CN103883256B (en) * | 2014-04-16 | 2015-11-18 | 国强建设集团有限公司 | A kind of drilling bit of multiple rollers |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20131023 |