CN103089152B - Embedded type wide-tooth cone bit - Google Patents
Embedded type wide-tooth cone bit Download PDFInfo
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- CN103089152B CN103089152B CN201310063629.6A CN201310063629A CN103089152B CN 103089152 B CN103089152 B CN 103089152B CN 201310063629 A CN201310063629 A CN 201310063629A CN 103089152 B CN103089152 B CN 103089152B
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Abstract
The invention discloses an embedded type wide-tooth cone bit, and belongs to the technical field of drilling equipment in petroleum and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The embedded type wide-tooth cone bit comprises a bit body and at least one cone. Teeth are arranged on the cone, wherein the teeth are wide. The width of two-fifths of the tooth top of each wide tooth is larger than or equal to that of a tooth pillar. An outline of the cross section of the tooth pillar of each wide tooth is non-circular. The pillar face of the tooth pillar of each wide tooth is provided with strip-teeth which are parallel to an axis of the wide teeth. The wide teeth are embedded and fixed in tooth holes of the cone in a mode that the strip teeth on the tooth pillar are embedded into the hole wall of the tooth holes of the cone or the wide teeth are in interference fit with the hole wall in a multipoint attachment mode. Reliability of teeth embedding and fixing and manufacturing craft are ensured, and meanwhile stratum adaptability of the bit is enlarged, service life of the bit teeth and the bit is prolonged, and the bit has obvious advantages in the process of drilling in soft stratum.
Description
Technical field
The invention belongs to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relate to concretely a kind of rock bit.
Background technology
Drill bit be in drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Rock bit is rock crushing tool conventional in drilling engineering.Tricone bit is the form fractured rock impact to crush mainly, and tooth is by the impact of rock, extruding with scrape and cut fractured rock with a small amount of slippage.The tricone bit using in drilling engineering at present comprises steel-tooth bit (claim not only mill tooth bit) and tungsten carbide insert bit (but also claiming tungsten carbide insert bit).Mill teeth rock bit is on gear wheel base substrate, directly to mill out cutting teeth, and cutting teeth material is identical with cone body material, is generally steel material, and the intensity of tooth is lower, abrasion resistance is poor, is generally used for soft formation.。Due to the size large (addendum width and proud exposure are all larger) of tooth, therefore mill tooth bit is high at the middle efficiency of breaking rock of creeping into of soft formation; But due to the restriction of cutting teeth material, easily there is Strength Failure and wear out failure in Cutter.For improving the abrasion resistance of cutting teeth, generally to carry out intensive treatment on steel-tooth surface, or surfacing antifriction alloy is to improve its surface strength and abrasion resistance, but surface strengthen layer or surfacing layer thickness after processing are limited, surface strength and abrasion resistance are still not as good as carbide alloy, and the steel-tooth after processing is compared and still had larger gap with carbide alloy tooth.The cutting teeth life-span of mill teeth rock bit is not high, has limited its application life and the application in stratum hard or that abrasiveness is strong thereof.Tungsten carbide insert bit is 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) in the reserved perforation of cone body, and the hardness of hard-metal insert and abrasion resistance are obviously better than steel-tooth, are generally used for compared with hard formation.The tooth size less (particularly addendum width is little) of insert bit, and its addendum width is all 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 compared with hard formation preferably.But because tooth size is little, insert bit is in the obviously too late mill teeth rock bit of 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.
Summary of the invention
The object of the invention is to: the embedded wide tooth roller drill bit that a kind of wide tooth top is provided, this drill bit is when guaranteeing the inlaid solid reliability of tooth and anufacturability, can expand the ground adaptability of drill bit, and the application life of improving drill teeth and drill bit, particularly in the creeping into of soft formation, there is obvious advantage.
The present invention is that the adopted technical scheme that achieves the above object is:
A kind of embedded wide tooth roller drill bit, comprise bit body, at least one gear wheel, described gear wheel is provided with tooth, it is characterized in that: described tooth is wide tooth, 4 minutes addendum widths of described wide tooth are more than or equal to its tooth post width, the cross-sectional profiles of the tooth post of described wide tooth is non-circular, on the tooth post cylinder of described wide tooth, be provided with the bar tooth that is parallel to wide tooth axis, and wide tooth invades the mode of gear wheel perforation hole wall by the bar tooth on tooth post or to form the mode of interference fit of Multi-contact inlaid solid in the perforation of gear wheel with hole wall.
On tooth post cylinder, be provided with a plurality of dentation vertical bars that are parallel to the axis of wide tooth, similar to the gear teeth of spur gear, referred to as bar tooth.
Wide tooth invades the mode of gear wheel perforation hole wall by the bar tooth on tooth post or to form the interference fit of Multi-contact inlaid solid in the perforation of gear wheel with hole wall, in this manual, by this inlaid solid mode referred to as embedded.
The structure of tooth is one of key factor affecting roller bit cutting efficiency.The tooth of insert bit and the perforation on gear wheel adopt interference fit (or welding-on etc.) mode to be inlaid solid on gear wheel conventionally.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 is partly positioned at outside the surface of cone shell, for directly contact, (this part is called the working portion of tooth to fractured rock, bizet or head also referred to as tooth), generally, radially (perpendicular to 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 are the keys that determines tooth service behaviour.Conventionally so-called " flute profile " or " profile of tooth " just refer to the classification of tooth being done according to the feature of tooth corona shape and size.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.
Proud exposure h, the addendum width W of tooth and the addendum thickness T(of tooth that the major parameter that characterizes tooth corona shape and size is tooth are shown in Figure 20).Proud exposure h refers to the height of tooth exposure outside cone shell surface, is called for short proud exposure or tooth depth; The maximum transverse size of the tooth top region that the addendum width W of tooth refers to tooth in the plane perpendicular to tooth axis, is called for short addendum width; The thickness T of tooth refers to that tooth tooth top region is in the maximum transverse size perpendicular to 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, and tooth more sharply, is more easily invaded rock, but Strength Failure also more easily occur simultaneously, and 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 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, now, the width of tooth is larger, scrapes area inswept while cutting just larger, scrapes that to cut broken the effect of rock also just more obvious.
Yet, particularity due to tooth corona shape, the concept of tooth " tooth top region " has certain ambiguity, thereby needs in addition concrete agreement, can be according to unified method tolerance addendum width and the object of addendum thickness to the tooth of various shapes to reach.For this reason, spy does agree as follows: N is a natural number, longitudinally apart from the position of tooth bizet peak h/N, doing a plane P perpendicular to tooth axis (seeing Figure 20), the N that is tooth by this plane to the region between tooth bizet peak on tooth divides tooth top region.Within the N of tooth divides tooth top region, perpendicular to the maximum transverse size of tooth axis, for the N of tooth divides addendum width (also: the N of tooth divides the Breadth Maximum of tooth top region projection in plane P); Maximum transverse size corresponding direction in P plane is tooth top facewidth direction; This tooth top region is in the maximum transverse size perpendicular in addendum width direction, for the N of tooth divides addendum thickness.In Figure 20,4 minutes tooth top regions (P plane is to the region between the peak of 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 is all more and more sharp-pointed to top by root, so the tooth cross-sectional width/thickness in plane P divides addendum width/thickness with regard to equaling the N of tooth.
The top exposure part of the tooth on existing insert bit, is from lower teeth post and starts the pointed nose upwards shrinking gradually, and the addendum width of tooth is all significantly less than the diameter of lower teeth post.Tooth in the present invention has longer addendum width, and 4 minutes addendum widths of tooth are all more than or equal to the width of tooth lower teeth post, and the tooth of this kind of long addendum width is called to wide tooth.
As shown in Figure 6, on the tooth post cylinder of wide tooth, be provided with the dentation vertical bar (being called for short bar tooth) of the axis that is parallel to wide tooth, the cross-sectional profiles of tooth tooth post refers to by the profile of the formed envelope of tooth top of each tooth (as 311 in Fig. 6), and its tooth column length or width calculate by this profile.
Laterally (vertical tooth short transverse) maximum size of wide tooth tooth post is the length of tooth post, and the maximum transverse size of vertical length direction is the width (as Fig. 5, L1 is the length of tooth post, and W1 is the width of tooth post) of tooth post.
4 minutes addendum widths of the wide tooth of the present invention are more than or equal to the width of its tooth post, and the addendum width of wide tooth and exposure size are all larger, can effectively improve drill bit compared with the efficiency of breaking rock of incompetent bed.The cross-sectional outling of this kind of tooth post is non-circular wide tooth, 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 be obviously longer than conventional inserted, and the length of lower teeth post can be the lengthening of adaptation tooth top width and lengthens, and the long tooth top width that non-circular tooth post cross-sectional outling is tooth is provided convenience and condition.When tooth top exposure part is stressed with rock effect, the tooth of longer addendum width is uneven along the stressed possibility in addendum width direction, the non-circular tooth post in 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.
As Fig. 6, on the cylinder of the lower teeth post of wide tooth, be provided with a plurality of bar teeth that are parallel to tooth axis, be distributed in the bar tooth indentation on inlaid solid cylinder, similar to the gear teeth of spur gear.The shape of the cross-sectional outling of tooth tooth post is similar to cutter teeth hole shape, but radial dimension is greater than the radial dimension of gear wheel perforation.When the deviation of both radial dimensions is larger (particularly when bar tooth top portion is more sharp-pointed), at tooth, be pressed in the process of gear wheel perforation, bar tooth can embed or invade the hole wall of perforation, thereby realizes the inlaid solid of tooth; When the deviation of both radial dimensions hour (particularly when bar tooth top portion is more blunt), at tooth, be pressed in the process of gear wheel perforation, the interference fit of the top of each tooth and the hole wall of perforation formation Multi-point contact type, so also can realize the inlaid solid of tooth.The inlaid solid part in tooth bottom on existing insert bit gear wheel is cylindrical, it is inlaid solid on gear wheel that tooth contacts interference fit by face, value of interference fit between tooth and gear wheel perforation requires very high, and the magnitude of interference determines inlaid solid intensity and the reliability of tooth.The magnitude of interference too senior general causes that cutter teeth bore deformation is excessive, easily causes gear wheel perforation cracking, affects permanent tooth intensity, permanent tooth reliability and cone shell intensity; The magnitude of interference is too little, permanent tooth insufficient strength, and tooth is inlaid solid not firm, and reliability is low.Therefore, this inserted mode requires all higher to crudies such as dimensional accuracy, tolerance and the surface roughnesses of perforation and tooth cylinder, for ease of processing and guarantee inlaid solid quality, general interference fit all adopts cylindrical, tooth all needs to carry out fine grinding, and perforation also needs to do fine finishining (conventionally needing fraising).For ease of increasing addendum width, the cross-sectional outling of the lower teeth post of the horizontal tooth of having a denture made of the present invention is non-circular, for guaranteeing to inlay reliability and inlay quality, the cylinder of the inlaid solid part of tooth is provided with bar tooth, adopts the mode of embedding or Multi-contact interference fit inlaid solid in the perforation of gear wheel.Adopt permanent tooth in this way, the tolerance of radial dimension poor (magnitude of interference), the accuracy of form and position and surface quality to tooth and perforation obviously increases, can greatly reduce the crudy requirement such as processing dimension (precision, tolerance) requirement, surface roughness of tooth and perforation, processing technology is good, be easy to realize the non-circular column of tooth and manufacture moulding, also can guarantee inlaying reliability and inlaying quality of tooth simultaneously.
Press such scheme, the material of described wide tooth is carbide alloy, or diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond cutting teeth etc.
Beneficial effect of the present invention is:
(1) on bit cone, adopt wide tooth, the tooth post cross-sectional outling of wide tooth is non-circular, and the addendum width of wide tooth is long; Wide tooth on gear wheel is inserted, wide tooth can be selected the material different from cone body, as the hard-metal insert, the diamond that adopt hardness and abrasion resistance to be all much better than gear wheel material are done the carbide alloy composite teeth that 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 present invention 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 compared with soft formation, drill bit service behaviour can obviously be promoted.
(2) on the tooth post cylinder of the wide tooth of the present invention, be provided with the bar tooth that is parallel to wide tooth axis, its embedded inserted mode obviously increases the tolerance of the radial dimension of tooth and perforation poor (magnitude of interference), the accuracy of form and position and surface quality, can greatly reduce the crudy requirements such as processing dimension (precision, tolerance) requirement, surface roughness of tooth and perforation, also can guarantee inlaying reliability and inlaying quality of tooth simultaneously.This permanent tooth mode has reduced the processing technology requirement of tooth and gear wheel perforation, and workable, processing cost is low, and can reach good inlaid solid quality.
(3) the present invention adopts wide tooth, has expanded the stratum accommodation of drill bit, drill bit can be applied to compared with the creeping into of hard formation, and has particularly widened the application of drill bit in the stratum that has hard interbedded layer, the staggered stratum of soft or hard and heterogeneity stratum.The present invention adopts wide tooth to strengthen the compliance on drill bit stratum, has improved the drilling efficiency of drill bit, can reduce drilling cost.
(4) the wide tooth that the present invention adopts has larger addendum width and exposure size, compares the shaft bottom coverage scale that can effectively improve drill bit with traditional tungsten carbide insert bit, and then improves drill bit efficiency of breaking rock.
As preferably, 4 minutes addendum widths of described wide tooth are more than or equal to its tooth column length.
In such scheme, make full use of the tooth column length of wide tooth, along tooth column length, increase the addendum width of wide tooth, can make full use of and bring into play the above-mentioned beneficial effect of wide teeth drill bit.When the addendum width of wide tooth equals its tooth column length, lower teeth column dimension and the top exposure of wide tooth are measure-alike, are conducive to the machine-shaping of wide tooth.4 minutes addendum width W of wide tooth are greater than the length L 1 of tooth post, further break through the inertial thinking of the sharp-pointed form of prior art tooth, form a up big and down small similar mushroom.The wide tooth of this structure is conducive to wide teeth drill bit compared with the raising of soft formation drilling efficiency, can be issued to the object that increases addendum width in the prerequisite that does not increase inlaid solid portion size, cutter teeth hole dimension, it has also guaranteed the intensity of cone shell when having guaranteed the inlaid solid reliability of tooth simultaneously.
As further preferred, 4 minutes addendum widths of described wide tooth are not less than 1.2 times of its tooth post width.
As further preferred, 4 minutes addendum widths of described wide tooth are not less than 1.5 times of its tooth post width.
As further preferred, the lower teeth post of described wide tooth and top exposure part are through step transition.
In such scheme, this lower teeth post and top exposure part are through the wide tooth of step transition, its step surface can be sat on the aperture face that is pressed in gear wheel perforation, axial compression while making tooth work is born by perforation aperture face, no longer by the low cone shell of perforation, is born.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, the thickness at the bottom of can reducing gear wheel perforation hole and between gear wheel inner bearing hole, thus the size in gear wheel inner bearing hole increased, increase the size of gear wheel inner bearing, improve intensity and the application life of gear wheel bearing, and then extend drilling life of bit.
As further preferred, the lower teeth post of described wide tooth and the transition of top exposure partial arc.
As preferably, the shape of cross section of described wide tooth tooth post is the round rectangle of two semicircle.
In such scheme, the tooth post cross section of wide tooth is the round rectangle of two semicircle, is conducive to the processing of corresponding perforation on the machine-shaping of wide tooth tooth post and gear wheel.
As preferably, the shape of cross section of described wide tooth tooth post is oval.
In such scheme, the tooth post cross section of wide tooth is oval, is conducive to the processing of corresponding perforation on the machine-shaping of wide tooth tooth post and gear wheel, and oval perforation is also convenient to realize modern digital machine, processes workable.
As preferably, the cross-sectional profiles of described wide tooth tooth post is intersected the outline forming and is formed by least two circles.
In such scheme, the cross-sectional profiles of wide tooth tooth post is intersected the outline forming and is formed by a plurality of circles, and its corresponding perforation shape is also that a plurality of circles intersect formation, and it is convenient to processing (as brill or the milling etc.) moulding of tooth tooth post and perforation, and processing technology is good; 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 tooth tooth post is three circle fusiformis, and 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 is also 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 tooth tooth post is connected and composed via straightway or curved section (preferably circular arc) by least two circular arcs.
As further preferred, the cross-sectional profiles of described wide tooth tooth post is both sides major arc, and intermediate curve section (preferably circular arc) or straightway are formed by connecting.
As preferably, described wide tooth is carbide alloy tooth, or diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond tooth etc.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embedded wide tooth roller drill bit of the present invention.
Fig. 2 is the top view (view while seeing along drill axis against drill bit drilling direction) of structure drill bit shown in Fig. 1.
Fig. 3 is the wide tooth shaft bottom cloth tooth coverage diagram radially of the embedded wide tooth roller drill bit of the present invention.
Fig. 4 is that the cross-sectional profiles of wide tooth tooth post of the present invention is a kind of tooth structure schematic diagram of wide tooth of the round rectangle of two semicircle.
The schematic diagram of Fig. 5 when to be wide tooth shown in Fig. 4 see at the bottom of from tooth top to tooth along tooth axis.
Fig. 6 is provided with the dentation vertical bar (being called for short bar tooth) of the axis that is parallel to wide tooth, the schematic diagram of tooth post cross section and cross-sectional outling (the protruding top of bar tooth profile) on the cylinder of tooth post of the wide tooth of the present invention.
Fig. 7 is that wide tooth shown in Fig. 4 is inlaid solid after gear wheel perforation, the partial sectional view while dissecing along tooth axis.
Fig. 8 is that wide tooth shown in Fig. 4 is inlaid solid after gear wheel perforation, the partial sectional view while dissecing along the cross section of tooth lower teeth post.
Fig. 9 is the tooth structure schematic diagram that the shape of cross section of wide tooth tooth post of the present invention is oval-shaped a kind of wide tooth.
The schematic diagram of Figure 10 when to be wide tooth shown in Fig. 9 see at the bottom of from tooth top to tooth along tooth axis.
Figure 11 is the tooth structure schematic diagram that wide tooth tooth column length of the present invention equals a kind of wide tooth of 4 minutes addendum widths of wide tooth.
The schematic diagram of Figure 12 when to be wide tooth shown in Figure 11 see at the bottom of from tooth top to tooth along tooth axis.
Figure 13 is that wide tooth tooth column length of the present invention is less than 4 minutes addendum widths of wide tooth, and lower teeth post and top exposure part are through the tooth structure schematic diagram of a kind of wide tooth of step transition.
The schematic diagram of Figure 14 when to be wide tooth shown in Figure 13 see at the bottom of from tooth top to tooth along tooth axis.
Figure 15 is that wide tooth shown in Figure 13 is inlaid solid after gear wheel perforation, the partial sectional view while dissecing along tooth axis.
Figure 16 is that wide tooth tooth column length of the present invention is less than 4 minutes addendum widths of wide tooth, the tooth structure schematic diagram of a kind of wide tooth of lower teeth post and the transition of top exposure partial arc.
The schematic diagram of Figure 17 when to be wide tooth shown in Figure 16 see at the bottom of from tooth top to tooth along tooth axis.
Figure 18 is that tooth post cross-sectional profiles is the wide tooth tooth post cross-sectional profiles schematic diagrames of three circles during fusiformis.
Figure 19 is that tooth post cross-sectional profiles is the wide tooth tooth post cross-sectional profiles schematic diagram that the middle circular arc of both sides major arc or straightway are formed by connecting.
Figure 20 is for take the schematic diagram of 4 minutes addendum width W of tooth that chisel teeth is example and thickness T.
In figure: 1, bit body, 2, gear wheel, 3, wide tooth, 31, tooth post, 311, tooth post cross-sectional outling (bar tooth tooth top envelope).
The specific embodiment
Following non-limiting examples is used for illustrating the present invention.
embodiment 1:
As shown in Fig. 1 to 8, a kind of embedded wide tooth roller drill bit, comprises that bit body 1, at least one gear wheel 2(are as three gear wheels etc.), on gear wheel 2, inlay natural breadth tooth 3, wide tooth 3 is preferably carbide alloy tooth, or diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond tooth etc.4 minutes addendum width W of wide tooth 3 are more than or equal to its tooth post width W 1, and preferably, 4 minutes addendum widths of wide tooth 3 are not less than 1.2 times of its tooth post 31 width, and more preferably, 4 minutes addendum widths of wide tooth 3 are not less than 1.5 times of its tooth post 31 width.The cross-sectional outling of the tooth post 31 of wide tooth 3 is non-circular, as preferably, the shape of cross section of the tooth post 31 of wide tooth 3 is the round rectangle of two semicircle, on the cylinder of the tooth post 31 of wide tooth 3, be provided with the bar tooth of the axis that is parallel to wide tooth 3, while wide tooth 3 invades the mode of gear wheel 2 perforation hole walls by the bar tooth on tooth post 31 or to form the mode of interference fit of Multi-contact inlaid solid in the perforation of gear wheel 2 with hole wall.
embodiment 2:
As shown in Fig. 9,10, a kind of embedded wide tooth roller drill bit, comprises that bit body 1, at least one gear wheel 2(are as three gear wheels etc.), on gear wheel 2, inlay natural breadth tooth 3, wide tooth 3 is preferably carbide alloy tooth, or diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond tooth etc.4 minutes addendum width W of wide tooth 3 are more than or equal to its tooth post width W 1, and preferably, 4 minutes addendum widths of wide tooth 3 are not less than 1.2 times of its tooth post 31 width, and more preferably, 4 minutes addendum widths of wide tooth 3 are not less than 1.5 times of its tooth post 31 width.The cross-sectional outling of the tooth post 31 of wide tooth 3 is non-circular, as preferably, the shape of cross section of the tooth post 31 of wide tooth 3 is oval, on the cylinder of the tooth post 31 of wide tooth 3, be provided with the bar tooth of the axis that is parallel to wide tooth 3, while wide tooth 3 invades the mode of gear wheel 2 perforation hole walls by the bar tooth on tooth post 31 or to form the mode of interference fit of Multi-contact inlaid solid in the perforation of gear wheel 2 with hole wall.
embodiment 3:
The present embodiment and embodiment 1 or 2 are basic identical, and its difference is: 4 minutes addendum width W of wide tooth 3 are more than or equal to its tooth column length L1.As shown in Figure 11,12, illustrate wide tooth 3 tooth column lengths and equal 4 minutes addendum widths of wide tooth.
embodiment 4:
As shown in Figure 13,14,15, the present embodiment is substantially the same manner as Example 3, and its difference is: the lower teeth post 31 of wide tooth 3 and top exposure part are through step transition.
embodiment 5:
As shown in Figure 16,17, the present embodiment is substantially the same manner as Example 3, and its difference is: lower teeth post 31 and the transition of top exposure partial arc of wide tooth 3.
embodiment 6:
As shown in Figure 18,19, the present embodiment and embodiment 1-5 are basic identical, and its difference is: the cross-sectional outling of the lower teeth post 31 of wide tooth 3 intersects by least two circles the outline forming and forms.As Figure 18, the shape of cross section of the tooth post 31 of wide tooth 3 is three circle fusiformis, and the cross-sectional profiles of tooth post 31 is mainly intersected and formed by three circles, and the radius of middle circle (arc) is greater than the radius of both sides circles (arc), formation one fusiformis.
embodiment 7:
The present embodiment and embodiment 1-5 are basic identical, and its difference is: the cross-sectional profiles of wide tooth 3 tooth posts 31 is connected and composed via straightway or curved section (preferably circular arc) by least two circular arcs.Preferably, the cross-sectional profiles of wide tooth 3 tooth posts 31 is both sides major arc, and intermediate curve section (preferably circular arc) or straightway are formed by connecting.As Figure 19, the cross-sectional outling of the tooth post 31 of wide tooth 3 is formed by connecting by circular arc in the middle of the major arc of both sides or straightway.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an embedded wide tooth roller drill bit, comprise bit body, at least one gear wheel, described gear wheel is provided with tooth, it is characterized in that: described tooth is wide tooth, 4 minutes addendum widths of described wide tooth are more than or equal to its tooth post width, the cross-sectional profiles of the tooth post of described wide tooth is non-circular, on the tooth post cylinder of described wide tooth, be provided with the bar tooth that is parallel to wide tooth axis, and wide tooth invades the mode of gear wheel perforation hole wall by the bar tooth on tooth post or to form the mode of interference fit of Multi-contact inlaid solid in the perforation of gear wheel with hole wall.
2. embedded wide tooth roller drill bit as claimed in claim 1, is characterized in that: 4 minutes addendum widths of described wide tooth are more than or equal to its tooth column length.
3. embedded wide tooth roller drill bit as claimed in claim 2, is characterized in that: the lower teeth post of described wide tooth and top exposure part are through step transition.
4. embedded wide tooth roller drill bit as claimed in claim 1, is characterized in that: the shape of cross section of described wide tooth tooth post is the round rectangle of two semicircle.
5. embedded wide tooth roller drill bit as claimed in claim 1, is characterized in that: the shape of cross section of described wide tooth tooth post is for oval.
6. embedded wide tooth roller drill bit as claimed in claim 1, is characterized in that: the cross-sectional profiles of described wide tooth tooth post intersects by least two circles the outline forming and forms.
7. embedded wide tooth roller drill bit as claimed in claim 6, is characterized in that: the shape of cross section of described wide tooth tooth post is three circle fusiformis.
8. embedded wide tooth roller drill bit as claimed in claim 1, is characterized in that: the cross-sectional profiles of described wide tooth tooth post is connected and composed via straightway or curved section by least two circular arcs.
9. embedded wide tooth roller drill bit as claimed in claim 8, is characterized in that: the cross-sectional profiles of described wide tooth tooth post is both sides major arc, and intermediate curve section or straightway are formed by connecting.
10. the embedded wide tooth roller drill bit described in arbitrary claim in claim 1 to 9, is characterized in that: described wide tooth is carbide alloy tooth, or diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond tooth.
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| CN201310063629.6A CN103089152B (en) | 2013-02-28 | 2013-02-28 | Embedded type wide-tooth cone bit |
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| CN201310063629.6A CN103089152B (en) | 2013-02-28 | 2013-02-28 | Embedded type wide-tooth cone bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054669C (en) * | 1996-05-16 | 2000-07-19 | 王用顺 | Bit of preventing gear wheel from dropping off |
| CN2263194Y (en) * | 1996-06-21 | 1997-09-24 | 西南石油学院 | Roller bit with inside strength tooth |
| US7195086B2 (en) * | 2004-01-30 | 2007-03-27 | Anna Victorovna Aaron | Anti-tracking earth boring bit with selected varied pitch for overbreak optimization and vibration reduction |
| CN2688864Y (en) * | 2004-04-21 | 2005-03-30 | 江汉石油钻头股份有限公司 | Jointing tooth for tri-cone rotary drilling bit |
| US7387177B2 (en) * | 2006-10-18 | 2008-06-17 | Baker Hughes Incorporated | Bearing insert sleeve for roller cone bit |
| US7992658B2 (en) * | 2008-11-11 | 2011-08-09 | Baker Hughes Incorporated | Pilot reamer with composite framework |
| JP2011149248A (en) * | 2010-01-25 | 2011-08-04 | Teikusu Holdings:Kk | Rock bit |
| CN102287139A (en) * | 2010-06-18 | 2011-12-21 | 北京石油化工学院 | Cone bit metal floating-sealing device |
| CN203248079U (en) * | 2013-02-28 | 2013-10-23 | 西南石油大学 | Embedded type wide-tooth roller bit |
-
2013
- 2013-02-28 CN CN201310063629.6A patent/CN103089152B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103089152A (en) | 2013-05-08 |
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