CN203248078U - Disc insert cone bit - Google Patents

Abstract

The utility model discloses a disc insert roller bit, and belongs to the technical field of drilling equipment of petroleum and gas, mine engineering, building fundamental engineering construction, geology, hydrology and the like, and particularly relates to cone bits. The disc insert cone bit comprises a bit body and at least one cone, transversely embedded teeth are embedded and fixed on the cone, the value range of the tooth crest deflection angle alpha of the transversely embedded teeth satisfies the condition that the absolute value of the alpha is larger than or equal to 70 degrees and smaller than or equal to 90 degrees, the embedding and fixing portions of the transversely embedded teeth are columns with non-circular cross sections. The disc insert roller bit proposes a novel structural style, under the structural style, the teeth act on rock in a well bottom in a rolling compaction and splitting mode, and particularly has unique advantages for drilling of hard brittle stratums and hard non-abrasive stratums, relative high rock breaking efficiency of the bit is guaranteed, the service life of bit teeth and the service life of bearings are prolonged, and the service life of the bit is further prolonged.

Description

A kind of disc type insert bit

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.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.Steel-tooth bit is directly to mill out cutting teeth on the gear wheel base substrate, and the intensity of tooth is lower, abrasion resistance is relatively poor, generally is used for soft formation; Tungsten carbide insert bit is inlaid solid carbide alloy tooth (hereinafter to be referred as hard-metal insert or tooth) in the perforation that cone body is reserved, and the hardness of hard-metal insert and abrasion resistance obviously are better than steel-tooth, general being used for than hard formation.Tricone bit is mainly with the broken rock of the form of impacting crushing, and namely tooth cuts fractured rock by scraping to the impact of rock, extruding with a small amount of slippage, and its shortcoming is that capacity usage ratio is not high, efficiency of breaking rock is lower, and in the drill bit course of work, the impact that bearing is subject to is large, and dynamic load factor is large.On form of structure, in order to satisfy the needs of the broken broken rock working method of insert bit punching press, existing drill bit has adopted following three technological means: one, the inlaid solid part in bottom of the cutting teeth (tooth) on the existing insert bit is column type, top exposure part is shunk transition by lower cylindrical gradually to the tooth axis, mostly be wedge shape or taper, the addendum width of tooth all is significantly less than the diameter of the inlaid solid part in bottom, to form more sharp-pointed impact head.Because the dynamic load that tooth is subjected to is large, and the tooth size less, so integral body or the local fracture of tooth occur easily.Its two, the tooth top zero deflection (being that the tooth top deflection angle is 0 °) of existing most of tri-cone insert bits gear wheel upper teeth also has tooth (cutting teeth) tooth top of the part gear ring of a small amount of drill bit that deflection is arranged, deflection angle is generally in 50 °.The deflection of tooth be for cater to tooth impact the slippage be pressed into behind the rock scrape butt to, the slippage of rock scraped cut effect (amount) to increase tooth.They are three years old, there is skew in the gear wheel of most tricone bits, its purpose is, skew makes gear wheel when bottom rock rolls broken rock pure rolling can't occur, slippage increases when making the broken rock of tooth on the gear wheel, tooth slippage on the larger gear wheel of deviant is scraped and is cut more obviously, but the wearing and tearing that also produce because of slippage simultaneously are also larger.

The utility model content

The purpose of this utility model is: a kind of disc type insert bit is provided, it proposes a kind of new form of structure, this drill bit has laterally inlaid solid tooth, tooth under this form of structure acts on bottom rock in the mode of rolling compaction, splitting, to press stone roller, the broken rock of splitting close to the mode of static pressure, creep into for hard formation and to have unique advantage, be particularly suitable for creeping into of hard fragility and hard abrasiveness rock stratum, when guaranteeing the higher efficiency of breaking rock of drill bit, can prolong the life-span of drill teeth and bearing, and then prolong drilling life of bit.

The utility model purpose realizes by following technical proposals:

A kind of disc type insert bit, comprise bit body, at least one gear wheel, inlaid solid on the described gear wheel have the horizontal tooth of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part of the horizontal tooth of having a denture made 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 the inlaid solid part of tooth), and the surface that tooth and perforation form interference fit is generally the face of cylinder; The top of tooth 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.According to the difference of tooth bizet geometrical body principal character, tooth can be divided into rotary type tooth and non-revolved body class tooth two large classes.The bizet surface of rotary type tooth is the surface of revolution coaxial with tooth center line, such as hemi-spherical ended shape insert and conical tooth.If the bizet of tooth surface is non-rotating curved surface, though or be its centre of gyration of surface of revolution and tooth center disalignment, such tooth is non-revolved body class tooth, such as chisel teeth, scoop chisel insert, eccentric scoop chisel insert and 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 Fig. 4).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.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.The tooth of insert bit is general many according to the tooth top width direction direction parallel with the gear wheel bus inlaid solid (such as the tooth 5 among Fig. 5).Also can scrape the direction of cutting motion by first analyses and prediction tooth, then cut the inlaid solid tooth of the perpendicular or subvertical direction of the direction of motion (such as the tooth 6 among Fig. 5) according to tooth top width with scraping.

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 one perpendicular to the plane P (see figure 4) of tooth axis 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 Fig. 4,4 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.By definition as can be known, the difference of addendum width and addendum thickness is only just meaningful to non-revolved body class tooth.

The tooth top deflection angle refers to addendum line (the addendum width direction that is parallel to tooth, center by tooth top peak or highest region territory, and with the perpendicular straightway of tooth axis) with the angle (such as Fig. 5, shown in Figure 6) of the wheel cone nut line of the tooth place gear wheel bus of tooth axes intersect (on the wheel conical surface with), refer generally to addendum line and acute angle or the right angle of taking turns the cone nut line and becoming.Stipulate in this manual: from tooth top along the tooth axis direction to cone body, be positive deflection during the counterclockwise deflection of wheel cone nut line of the relative gear wheel of addendum line, otherwise then turn for negative bias.The tooth top zero deflection (being that the tooth top deflection angle is 0 °) of the cutting teeth on existing most of cone bit cones, or have the tooth tooth top of the part gear ring of a small amount of drill bit that deflection is arranged, deflection angle is generally in 50 °.

For ease of setting forth, define in this manual: the tooth top deflection angle of tooth can be described as the horizontal tooth of having a denture made during greater than 50 °.The span of the tooth top angle of deflection of the horizontal tooth of having a denture made of the present utility model be 70 °≤| α |≤90 °, the horizontal tooth of having a denture made is non-revolved body class tooth.

The skew of gear wheel refers to: the pole axis face of gear wheel (cross the gear wheel axis and be parallel to the plane of drill axis) is the offset distance of center line of bit relatively.As shown in Figure 7, for along drill bit drilling direction (along drill axis from the drill bit end of thread to the gear wheel end) when seeing, bit cone is perpendicular to the perspective view on the plane of drill axis, is the drill bit deviant apart from S among the figure between the axis projection of gear wheel and the bit central.

Adopt the horizontal tooth of having a denture made on the disc type insert bit, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made is between 70 °～90 ° or-90 °～-70 °, make with interval, space adjacent inserted with the horizontal tooth of having a denture made on the gear ring and greatly reduce, reduced the discontinuity of gear ring, and less with the interdental space of adjacent horizontal edge on the gear ring.For each horizontal tooth of having a denture made, and a plurality of continuously associatings of the horizontal tooth of having a denture made, it is the rolling of approximate pure rolling, splitting in the mode of operation in shaft bottom, utilize the horizontal tooth of having a denture made that the large contact stress of rock and extruding are come fractured rock, namely to press stone roller, the broken rock of splitting near the mode of static pressure, broken rock mode and common rock bit have obvious difference.The utility model proposes a kind of new form of structure, horizontal under this form of structure tooth of having a denture made acts on bottom rock in the mode of rolling compaction, splitting, to press stone roller, the broken rock of splitting near the mode of static pressure, creep into for hard formation and to have unique advantage, be particularly suitable for creeping into of hard fragility and hard abrasiveness rock stratum, when guaranteeing the higher efficiency of breaking rock of drill bit, can effectively prolong the life-span of drill teeth and bearing, and then prolong drilling life of bit.Each horizontal tooth of having a denture made all possesses above-mentioned effect, and the number of teeth purpose increase of ought horizontally having a denture made, and this effect will be remarkable all the more.And when horizontal have a denture made tooth and the non-horizontal tooth of having a denture made mixed, two kinds of teeth were brought into play its different mechanism separately, and the cooperative compensating gain effect of two kinds of broken rock modes of difference, will form another kind of unique effect.

Adopt the horizontal tooth of having a denture made on the disc type insert bit, and the cross-sectional outling of the inlaid solid part of the horizontal tooth of having a denture made is non-circular.Laterally (vertical tooth short transverse) maximum size of the horizontal inlaid solid part of tooth of having a denture made is the length of inlaid solid part, and the maximum transverse size of vertical length direction is the width (such as Figure 15, L1 is the length of inlaid solid part, and W1 is the width of inlaid solid part) of inlaid solid part.The cross-sectional outling of the inlaid solid part of this kind is the tooth of non-circular cylindricality, the tooth top width of its top exposure part can design very longly along the length direction of the inlaid solid part in bottom, tooth top width can obviously be longer than conventional tooth, and the length of the inlaid solid part in bottom can be the lengthening that adapts to tooth top width and lengthens.Be that inlaid solid part cross-sectional outling is non-circularly to provide convenience and condition for the long tooth top width of tooth.

Compared with prior art, its beneficial effect is:

(1) the utility model is broken through prior art to all inertial thinkings of insert bit, utilizes horizontal on the gear wheel tooth of having a denture made that the rolling of rock, splitting are come broken rock, has essential different from the broken rock mode of impact crushing of conventional rock bit.When the addendum line of the horizontal tooth of having a denture made perpendicular to or when approaching perpendicular to the gear wheel bus, the time in tooth contact shaft bottom is obviously elongated, gear wheel is owing to vertically (be drill bit shaft to) vibration that tooth alternately produces obviously dies down, for each horizontal tooth of having a denture made, utilize the horizontal tooth of having a denture made that the large contact stress of rock and extruding are come fractured rock, thereby realize pressing the purpose of stone roller, the broken rock of splitting near the mode of static pressure, particularly the efficiency of breaking rock of brittle rock is high firmly to hard rock.The horizontal tooth of having a denture made of inserted employing on the utility model gear wheel, the inlaid solid part in the bottom of the horizontal tooth of having a denture made is the column of non-circular (cross-sectional outling is non-circular), the inlaid solid part in bottom can lengthen along the addendum width direction, to adapt to the increase of addendum width, improve addendum width and increase the stressed of the inlaid solid part of rear lower, can improve the inlaid solid reliability between tooth and the gear wheel perforation, be convenient to the increase of addendum width.Adopt the horizontal tooth of having a denture made, less with the space between the adjacent teeth on the gear ring, and then the horizontal tooth formation of having a denture made of longer tooth top connects rotund fluted disc one by one, more be conducive to aforementionedly to press the realization of the broken rock purpose of stone roller, splitting near the mode of static pressure, the inlaid solid part in aforementioned bottom then further provides the more basis of advantage for the realization of this purpose for non-circular column.As mentioned above, this scheme is being broken the prior art inertial thinking, when proposing above-mentioned innovative thinking, has obtained unforeseeable effect.

(2) the tooth addendum line of the horizontal tooth of having a denture made on the utility model gear wheel perpendicular to or approach perpendicular to the gear wheel bus, thereby can realize rolling, in the splitting fractured rock, significantly reduce tooth with respect to the slippage of bottom rock.The mutual effect mode of the utility model tooth and rock and rock breaking mechanism are compared with conventional rock bit obvious change have been occured, its brand-new cloth tooth mode, profile of tooth and broken rock mode, having reduced tooth on the gear wheel scrapes the impact of rock and slippage and cuts, can obviously improve force-bearing situation and the wearing and tearing of tooth, improve the life-span of tooth, be particularly suitable for creeping at the strong hard formation of abrasiveness.

(3) the utility model gear wheel top rail have a denture made tooth addendum line perpendicular to or approach perpendicular to the gear wheel bus, the time in tooth contact shaft bottom is obviously elongated, gear wheel is owing to the extensional vibration that tooth alternately produces obviously dies down, the gear wheel stable working, be conducive to improve the life-span of bearing, the static strength that reduces tooth lost efficacy and the fatigue strength inefficacy.

(4) the utility model gear wheel stable working, the dynamic load when having reduced the interaction of drill teeth and rock is conducive to strengthen the inlaid solid reliability of tooth, reduces dropping of tooth.

(5) tooth on the gear wheel of the present utility model is inserted, so tooth can be selected the material different from cone body.The horizontal tooth of having a denture made can adopt hard-metal insert that hardness and abrasion resistance all be much better than the hard-metal insert of gear wheel material, strengthen with diamond, impregnated with diamond tooth 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, and cutting teeth life-span of the present utility model and bit life will obviously improve.This scheme so that its when broken rock mode has clear superiority, further be conducive to firmly, the creeping into of extremely hard, abrasive layer and deep-well, slim-hole.

As preferably, have 1 gear ring at least one gear wheel on the described bit body at least, the ratio that the above horizontal edge teeth number of gear ring accounts for place gear ring tooth number is at least 50%, and 4 minutes addendum widths of the horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth.

In the such scheme, horizontal edge teeth number accounts for the ratio of place gear ring tooth number more than 50%, and 4 minutes addendum widths of the horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth, make with adjacent inserted interval, space on the gear ring and greatly reduce, reduced the discontinuity of gear ring, the accumulation of each horizontal aforementioned effect of tooth of having a denture made under this critical condition, is qualitative change by quantitative development.Its purpose is, on this critical condition, tooth top profile inserted on each gear ring approaches formation one by one near continuous loop, along with this ratio increase and interval dwindle, and even the fluted disc of the complete circle under the optimum condition realizes that the gear ring tooth is well with the mode fractured rock of rolling compaction, splitting.

As more preferably, have at least 1 gear ring all to adopt the horizontal tooth of having a denture made at least one gear wheel on the described bit body.

Have at least 1 gear ring to adopt the horizontal tooth of having a denture made on the gear wheel of drill bit, with the horizontal tooth of having a denture made of full employing on the gear ring, interval, between cog space on the gear ring is reduced, reduced the discontinuity of gear ring, the tooth top profile of gear ring is conducive to the gear ring tooth with the mode fractured rock of rolling compaction, splitting closer to circle.

As more preferably, each gear wheel on the described bit body has at least 1 gear ring all to adopt the horizontal tooth of having a denture made.

Each gear wheel has at least 1 gear ring to adopt the horizontal tooth of having a denture made, and makes to adopt the interval, between cog space of the horizontal tooth of having a denture made to reduce on the gear wheel, has reduced the discontinuity of gear wheel gear ring, between the continuous gear ring of each gear wheel 1+1 occurs〉〉 2 the collaborative and accumulative action that goes forward one by one.The tooth top profile of gear wheel gear ring is conducive to gear ring and gear wheel with the mode fractured rock of rolling compaction, splitting closer to circle.

As more preferably, each gear wheel on the described bit body has at least 1 gear ring to adopt 4 minutes addendum widths to be not less than the horizontal tooth of having a denture made of the inlaid solid partial width of tooth.

Adopt 4 minutes addendum widths to be not less than the horizontal tooth of having a denture made of the inlaid solid partial width of tooth on the gear ring, the have a denture made tooth top width of tooth of gear ring top rail is longer, can reduce the interval, space between adjacent teeth on the gear ring, reduce the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, under this critical condition, more be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, load fluctuation when reducing gear wheel work, be conducive to the gear wheel gear ring and press stone roller, the broken rock of splitting, the life-span that is conducive to improve bearing and tooth in the static pressure mode.

As further preferred, each gear wheel on the described bit body has at least 1 gear ring to adopt 4 minutes addendum widths to be not less than the horizontal tooth of having a denture made of inlaid solid width of tooth, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 80 °≤| α |≤90 °.

Adopt 4 minutes addendum widths to be not less than the horizontal tooth of having a denture made of the inlaid solid partial width of tooth on the gear ring, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 80 °≤| α |≤90 °, can make on the gear ring interval, space between adjacent teeth less, reduce the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, and above-mentioned advantageous effects is better.

As preferably, be provided with the dentation vertical bar (being called for short the bar tooth) that is parallel to the tooth axis on the cylinder of the inlaid solid part of the described horizontal tooth of having a denture made, and the horizontal tooth of having a denture made embeds the mode of cutter teeth hole wall by the dentation vertical bar on the inlaid solid part cylinder, or the dentation vertical bar is inlaid solid in the perforation of gear wheel with the interference fit of cutter teeth hole formation Multi-point contact type.

Such as Figure 19, be provided with a plurality of bar teeth that are parallel to the tooth axis on the cylinder of the inlaid solid part in bottom of the horizontal tooth of having a denture made, be distributed in the bar tooth indentation on the inlaid solid part cylinder, similar to the gear teeth of spur gear.When being provided with the bar tooth on the cylinder of the inlaid solid part of tooth, the cross-sectional outling of inlaid solid part refers to the profile by the formed envelope in summit of each bar tooth.The shape of the cross-sectional outling of the inlaid solid part of tooth is similar to the 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 section is more sharp-pointed), be pressed in the process of gear wheel perforation at tooth, the 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 section is more blunt), be pressed in the process of gear wheel perforation at tooth, the interference fit of the top of each bar 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 the existing insert bit gear wheel is cylindrical, tooth is inlaid solid on gear wheel by face contact interference fit, 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 the 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, the permanent tooth insufficient strength, and tooth is inlaid solid not firm, and reliability is low.Therefore, this inlaid solid mode is all higher to the crudies such as dimensional accuracy, tolerance and the surface roughness requirement of perforation and tooth cylinder, and for ease of processing and guarantee inlaid solid quality, general interference fit all adopts cylindrical, and tooth all need carry out fine grinding.For ease of increasing addendum width, the inlaid solid part in the bottom of the horizontal tooth of having a denture made of the present utility model is non-circular column, for guaranteeing to inlay reliability and inlay quality, the cylinder of the inlaid solid part of tooth is provided with the bar tooth, adopts the mode of embedding or Multi-contact interference fit inlaid solid in the perforation of gear wheel.Adopt this mode permanent tooth, the tolerance of the radial dimension to tooth and perforation poor (magnitude of interference), the accuracy of form and position and surface quality obviously increases, can greatly reduce the crudy requirement such as processing dimension (precision, tolerance) requirement, surface roughness of tooth and perforation, be easy to realize the non-circular column manufacturing of tooth moulding, also can guarantee inlaying reliability and inlaying quality of tooth simultaneously.

As preferably, 4 minutes addendum widths of the described horizontal tooth of having a denture made are more than or equal to the length of inlaid solid part.

When addendum width W equals the length L of inlaid solid part in the such scheme, be convenient to the fine finishining of exterior of teeth, be easy to the control to the magnitude of interference between tooth and the gear wheel perforation during manufacturing; Be convenient to control the processing dimension of tooth and the inlaid solid quality of tooth.Addendum width W further breaks through the inertial thinking of the sharp-pointed form of prior art tooth greater than the length L of inlaid solid part in the such scheme, forms a up big and down small similar mushroom.Larger addendum width can obviously reduce the interval, space of gear ring adjacent teeth and the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, the tooth of being more convenient on the gear wheel acts on rock with rolling compaction, splitting mode, is easy to reach the effect of pressing stone roller, the broken rock of splitting in the static pressure mode.The horizontal tooth of having a denture made of this structure can not increase inlaid solid portion size, cutter teeth hole dimension, reach the prerequisite that does not reduce the spacing between the gear wheel perforation and be issued to the purpose that increases addendum width, it has also guaranteed the intensity of cone shell when having guaranteed the inlaid solid reliability of tooth.The horizontal tooth of having a denture made of this structure has numerous form of structure, and several better structures are wherein arranged: the horizontal tooth of having a denture made of this structure of the utility model a kind of, and the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part are through step transition, and the step surface edge contour be circle; The horizontal tooth of having a denture made of this structure of the utility model a kind of, the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part are through step transition, and the step surface edge contour is key shape.The inlaid solid part in this bottom and horizontal the have a denture made tooth of exposure part in top through step transition, its step surface can be sat on the aperture face that is pressed in the gear wheel perforation, and the 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 preferably, the arc that the tooth top of the described horizontal tooth of having a denture made raises up for the axis direction along tooth.

In the such scheme, when the tooth top of the horizontal tooth of having a denture made adopts arc, the more approaching circle of gear ring (profile) that the tooth top of the horizontal tooth of having a denture made on the same gear ring forms, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, load fluctuation when reducing gear wheel work is conducive to gear ring and gear wheel and presses stone roller, the broken rock of splitting, the life-span that is conducive to improve bearing and tooth in the static pressure mode.

As preferably, the tooth top of the described horizontal tooth of having a denture made is along the outline line of the tooth top width direction circular arc that is projected as along the axis direction of tooth.

In the such scheme and since the tooth axis on the gear wheel gear ring often with gear wheel axis out of plumb, particularly axis and the gear wheel axis angle near the gear ring tooth of gear wheel tip is less, when the gear ring girth is less, when the number of teeth was less on the gear ring, gear ring circularity was relatively poor.Be circular arc with the profile of the tooth top width direction of the horizontal tooth of having a denture made along the Projection Design of the axis direction of tooth, can improve the circularity of gear ring, make gear ring (profile) closer to circle, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, load fluctuation when reducing gear wheel work is conducive to the gear wheel gear ring and presses stone roller, the broken rock of splitting, the life-span that is conducive to improve bearing and tooth in the static pressure mode.

As preferably, all or part of interlaced arrangement of the horizontal tooth of having a denture made of different gear rings on the described gear wheel.

In the such scheme, gear wheel is the rotating cone body, when gear wheel rolls broken rock in the shaft bottom, tooth on each gear ring is changed to another from a scroll wheel, the horizontal tooth interlaced arrangement of having a denture made of different gear rings, tooth on the different gear rings can remedy the gear ring out-of-roundness of gear ring because causing with space, inserted interval of gear ring mutually, make gear wheel work more steady, reduce the shock loading of tooth, load fluctuation when reducing gear wheel work, be conducive to the gear wheel gear ring and press stone roller, the broken rock of splitting, the life-span that is conducive to improve bearing and tooth in the static pressure mode.And, the gear wheel top rail have a denture made tooth addendum line perpendicular to or approach perpendicular to the gear wheel bus, the time in tooth contact shaft bottom is obviously elongated, gear wheel is owing to the extensional vibration that tooth alternately produces obviously dies down, particularly have a denture made tooth on the gear wheel circumferencial direction during layout interlaced with each other when horizontal on two gear rings, the extensional vibration of gear wheel is more weak, the gear wheel stable working, be conducive to improve the life-span of bearing, the static strength that reduces tooth lost efficacy and the fatigue strength inefficacy.

As preferably, shown in the tooth top two ends (along the two ends of tooth top width) of the horizontal tooth of having a denture made be provided with rounding or chamfering.

In the such scheme, the tooth top two ends of the horizontal tooth of having a denture made are not as establishing rounding or chamfering transition, and the tooth top two ends will be wedge angle, and during the broken rock of tooth and rock effect, sharp corner easily forms stress and concentrates, and easily makes the fatigue damage of tooth top end or local fracture.Rounding or chamfering are established in the tooth top two ends, and the stress distribution that can effectively improve the tooth top end reduces stress to be concentrated, and prolong tooth application life.

As preferably, have at least to have at least a circle tooth to be the horizontal tooth of having a denture made on the described gear wheel, and the tooth top angle of deflection of the horizontal tooth of having a denture made of this circle is got the inverse value interlaced arrangement.

In the such scheme, get positive and negative inverse value with the have a denture made tooth top deflection angle of tooth of gear ring top rail, namely the tooth top yawing moment is opposite, and interlaced arrangement.Cutting teeth tooth top yawing moment is opposite, during the gear wheel rolling compaction cutting teeth of opposite deflection angle with intersection roll, the splitting rock produces staggered impression, this is conducive to be rolled, the fragmentation of splitting rock, improves efficiency of breaking rock; Simultaneously, the tooth top deflection angle is got inverse value, addendum line and gear wheel bus out of plumb, can increase that gear ring rolls, the width of splitting zone of fracture, namely increase the radially cover width that gear ring rolls, rock is broken in splitting, be conducive to the fragmentation of rock between the radially adjoining gear ring, improve the drill bit efficiency of breaking rock.

As preferably, the deviant of each gear wheel on the described bit body is not more than 1.5% of bit diameter.

The deviant of the gear wheel under this threshold makes gear ring and gear wheel with pure rolling or more near the form rolling work of pure rolling, more is conducive to gear ring and gear wheel with the mode fractured rock of rolling compaction, splitting; Simultaneously, the slippage that can also reduce the gear wheel upper teeth is scraped and is cut, and reduces the wearing and tearing of tooth, prolongs tooth application life.

The tooth addendum line of the horizontal tooth of having a denture made on the gear wheel perpendicular to or approach perpendicular to the gear wheel bus, the deviant of gear wheel is very little simultaneously, thereby can realize rolling, in the splitting fractured rock, significantly reduce tooth with respect to the slippage of bottom rock.The mutual effect mode of the utility model tooth and rock and rock breaking mechanism are compared with conventional rock bit obvious change have been occured, its brand-new cloth tooth mode, profile of tooth and broken rock mode, having reduced tooth on the gear wheel scrapes the impact of rock and slippage and cuts, can obviously improve stressing conditions and the wearing and tearing of tooth, improve the life-span of tooth, be particularly suitable for creeping at the strong hard formation of abrasiveness.

As preferably, 4 minutes addendum thicknesses of the horizontal tooth of having a denture made on the described gear wheel are not more than 25% of the inlaid solid partial width of tooth.

4 minutes addendum thicknesses of the horizontal tooth of having a denture made are not more than 25% of the inlaid solid partial width of tooth, the addendum thickness that is the horizontal tooth of having a denture made is less, under this threshold, when more being conducive to the tooth rolling compaction to the extruding slabbing action of rock, improve the drill bit efficiency of breaking rock, particularly to the high rigidity bad ground, rock breaking efficiency is better.

As preferably, have at least 50% gear ring to adopt the horizontal tooth of having a denture made on the described bit body, and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 85 °≤| α |≤90 °, and the deviant of gear wheel is not more than 0.5% of bit diameter on the bit body.

In theory, the tooth top deflection angle of more, the horizontal teeth of having a denture made of the horizontal tooth of having a denture made that adopt on the drill bit is more less near 90 °, the deviant of gear wheel, and the continuity of gear ring is better, the tooth top profile of gear ring is more close to circle; On the combination threshold of each parameter of this scheme, be conducive to the smooth working of gear wheel most, reduce the shock loading of tooth, the load fluctuation when reducing gear wheel work; Be conducive to most simultaneously the gear wheel gear ring and press stone roller, the broken rock of splitting in the static pressure mode, efficiency of breaking rock is the highest, and significantly improves the life-span of bearing and tooth.

More preferably, have 50% the horizontal tooth of having a denture made of gear ring employing on the described bit body at least, and the tooth top angle of deflection of the horizontal tooth of having a denture made=90 °, and gear wheel is not offset (deviant is 0) on the bit body.

Constant at other geometric parameters of drill bit, when tooth size was also constant, tooth top angle of deflection=90 ° can make the between cog space minimum, and the continuity of gear ring is best, and the tooth top profile of gear ring is close to circle; Gear wheel is not offset, and can make gear wheel pure rolling effect best.Tooth top angle of deflection=90 °, gear wheel are not offset, be realize gear ring and gear wheel with pure rolling (or near pure rolling) roll, the extremely excellent parameter of splitting fractured rock, the drill bit efficiency of breaking rock is high.

As preferably, the described horizontal tooth of having a denture made is inner sunken face along two sides on the thick direction of tooth top, and 4 minutes addendum widths of tooth are not less than the inlaid solid partial width of tooth, 4 minutes addendum thicknesses are not more than 25% of the inlaid solid partial width of tooth.

Tooth is inner sunken face along two sides on the thick direction of tooth top, less at vertical (along the tooth axis direction) upper teeth addendum thickness, down the increase of transverse tooth thickness is slow from tooth top, and it is conducive to tooth and rolls, is pressed into rock, and is conducive to tooth and is pressed into rear extruding slabbing action to rock; And it is conducive to the increase that tooth slows down the tooth addendum thickness in when wearing and tearing, and the tooth top that makes tooth continue to keep less is thick, prolongs tooth to being pressed into of rock, extruding, splitting crushing effect.

Description of drawings

Fig. 1 is the structural representation of the utility model disc type insert bit.

The view of Fig. 2 when to be the utility model structure shown in Figure 1 along drill axis overlook (contrary drill bit drilling direction is seen), i.e. top view.

Fig. 3 is the schematic diagram that the tooth gear ring of the utility model disc type insert bit radially covers along drill bit.

Fig. 4 is 4 minutes addendum width W of tooth and thickness T (take chisel teeth as example) schematic diagram.

Inlaid solid or tooth top has schematic diagram when inlaid solid than small deflection angle (| α |＜50 °) to Fig. 5 for the inserted tooth top zero deflection on the existing rock bit.

Fig. 6 be the span of wheel cone nut wire clamp angle (tooth top deflection angle) α of the addendum line of the horizontal tooth of having a denture made of the utility model and gear wheel be 70 °≤| α | the schematic diagram when＜90 ° or α=90 °.

Fig. 7 is the schematic diagram in gear wheel when skew on the drill bit.

Fig. 8 is the schematic diagram of certain gear wheel of the utility model structure drill bit shown in Figure 1 when seeing at the bottom of from the gear wheel tip to gear wheel along the gear wheel axis.

Fig. 9 is that the horizontal tooth of having a denture made of the utility model is inlaid solid behind the non-circular perforation of gear wheel, the partial sectional view when vertical tooth axis dissects.

Figure 10 is the schematic diagram of profile (and gear wheel perforation cross-sectional profiles) when being formed by connecting by arc section in the middle of the circular arc of two ends of cross section of the inlaid solid part of the horizontal tooth of having a denture made of the utility model.

Figure 11 is the inlaid solid partial-length L that the horizontal 4 minutes addendum width W of tooth that have a denture made of the present utility model equal tooth, but the horizontal toothing schematic diagram of having a denture made during greater than inlaid solid partial width W1.

Figure 12 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 11 when seeing at the bottom of from the tooth top to tooth along the tooth axis.

Figure 13 is that the horizontal tooth of having a denture made shown in Figure 11 is inlaid solid behind the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 14 is a kind of of the horizontal tooth of having a denture made of the utility model mushroom, and the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the horizontal tooth schematic diagram of having a denture made when the step surface profile is key shape.

Figure 15 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 14 when seeing at the bottom of from the tooth top to tooth along the tooth axis.

Figure 16 is a kind of of the horizontal tooth of having a denture made of the utility model mushroom, and the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, horizontal the have a denture made tooth schematic diagram of step surface profile when circular.

Figure 17 is the schematic diagram of the horizontal tooth of having a denture made shown in Figure 16 when seeing at the bottom of from the tooth top to tooth along the tooth axis.

Figure 18 is that the horizontal tooth of having a denture made of Figure 14 or mushroom shown in Figure 16 is inlaid solid behind the non-circular perforation of gear wheel, the partial sectional view when dissecing along the tooth axis.

Figure 19 is that the utility model adopts the horizontal tooth of having a denture made that is provided with the dentation vertical bar (being called for short the bar tooth) that is parallel to the tooth axis on the cylinder of inlaid solid part, before the horizontal tooth of having a denture made was not pressed in the perforation on the gear wheel, perforation profile size was in the tooth top profile of the inlaid solid part bar of the horizontal tooth of having a denture made tooth and the schematic diagram between the concave bottom profile.

Figure 20 is that the utility model adopts the horizontal tooth of having a denture made that is provided with the bar tooth of the axis that is parallel to tooth on the cylinder of inlaid solid part, and the horizontal tooth of having a denture made is inlaid solid behind the non-circular perforation of gear wheel, the partial sectional view when vertical tooth axis dissects.

Figure 21 is the bar tooth that is provided with the axis that is parallel to tooth on the cylinder of the horizontal inlaid solid part of tooth of having a denture made of the utility model, and the horizontal tooth addendum width of having a denture made equals the inlaid solid partial-length of tooth but the horizontal toothing schematic diagram of having a denture made during greater than inlaid solid partial width.

Figure 22 is that the horizontal tooth of having a denture made shown in Figure 21 is inlaid solid behind the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 23 is a kind of of the horizontal tooth of having a denture made of the utility model mushroom, be provided with the bar tooth of the axis that is parallel to tooth on the cylinder of the horizontal inlaid solid part of tooth of having a denture made, the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the step surface profile is key shape, horizontal the have a denture made tooth schematic diagram of addendum width during greater than the inlaid solid partial-length in bottom.

Figure 24 is a kind of of the horizontal tooth of having a denture made of the utility model mushroom, be provided with the bar tooth of the axis that is parallel to tooth on the cylinder of the horizontal inlaid solid part of tooth of having a denture made, the inlaid solid part in the bottom of the horizontal tooth of having a denture made and top exposure part is through step transition, the step surface profile is circular, horizontal the have a denture made tooth schematic diagram of addendum width during greater than the inlaid solid partial-length in bottom.

Figure 25 is that Figure 23 or the horizontal tooth of having a denture made shown in Figure 24 are inlaid solid behind the gear wheel perforation, the partial sectional view when dissecing along the tooth axis.

Figure 26 is the horizontal tooth of having a denture made embeds the cutter teeth hole wall with the bar tooth the inlaid solid schematic diagram in the gear wheel perforation of mode.

Figure 27 is the horizontal tooth of having a denture made forms Multi-point contact type with bar tooth and cutter teeth hole the inlaid solid schematic diagram in the gear wheel perforation of interference fit.

Figure 28 is that the horizontal tooth of having a denture made of the present utility model is inner sunken face along two sides on the thick direction of tooth top, the tooth schematic diagram when seeing along tooth addendum width direction.

Figure 29 adopts the horizontal drill bit top view of having a denture made during tooth of mushroom shown in Figure 24 on the gear wheel of the utility model disc type insert bit.

Figure 30 is the schematic diagram of certain gear wheel of the utility model structure drill bit shown in Figure 29 when seeing at the bottom of from the gear wheel tip to gear wheel along the gear wheel axis.

Figure 31 is that the tooth top angle of deflection of the horizontal tooth of having a denture made of part gear ring on the gear wheel of the present utility model is got the drill bit top view when inverse value is alternate to be arranged.

Figure 32 is the schematic diagram of certain gear wheel of the utility model structure drill bit shown in Figure 31 when seeing at the bottom of from the gear wheel tip to gear wheel along the gear wheel axis.

Figure 33 be the horizontal tooth of having a denture made of the utility model tooth top along the outline line of addendum line direction along the axis direction of tooth be projected as circular arc the time structural representation.

Figure 34 is the schematic diagram of the horizontal tooth of having a denture made of structure shown in Figure 33 when seeing at the bottom of from the tooth top to tooth along the tooth axis.

The specific embodiment

Following non-limiting examples is used for explanation the utility model.

Extremely shown in Figure 34 such as Fig. 1, basic example is: a kind of disc type insert bit, comprise bit body 1, at least one gear wheel 2, inlaid solid on the gear wheel 2 have a horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part 31 of the horizontal tooth of having a denture made is non-circular.As preferably, the hard-metal insert that the horizontal tooth 3 of having a denture made can be strengthened for hard-metal insert, with diamond, impregnated with diamond tooth etc.

The horizontal tooth of having a denture made of each of the utility model scheme all can be realized its effect, for the ease of example, all adopt modal tricone bit among each figure, each gear ring of each gear wheel is the horizontal tooth of having a denture made, it does not represent and the conflicting of basic example and other preferences, only be example directly perceived, there is not disturbance of understanding in those skilled in the art.

Preferred one as basic example has 1 gear ring at least at least one gear wheel on the bit body 1, the ratio that horizontal tooth 3 numbers of having a denture made account for place gear ring tooth number is at least 50%, and 4 minutes addendum width W of the horizontal tooth 3 of having a denture made are not less than the width W 1 of the inlaid solid part 31 of tooth.

As preferred one more preferably, have at least 1 gear ring all to adopt the horizontal tooth 3 of having a denture made at least one gear wheel 2 on the bit body 1, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; As further preferred, each gear wheel on the bit body 1 has at least 1 gear ring to adopt the horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As more preferably, each gear wheel on the bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 of the inlaid solid part of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As further preferred, each gear wheel on the bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the inlaid solid partial width W1 of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.More preferably, each gear wheel on the bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 of the inlaid solid part of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.Extremely shown in Figure 180 such as Fig. 6, Fig. 9.

As preferred two, 4 minutes addendum width W of the horizontal tooth of having a denture made are more than or equal to the length L 1 of inlaid solid part.More preferably, the span of the tooth top angle of deflection of the horizontal tooth of having a denture made be 80 °≤| α |≤90 °.4 minutes addendum width W of the horizontal tooth 3 of having a denture made equal the length of inlaid solid part, shown in Figure 11 to 13.4 minutes addendum width W of the horizontal tooth 3 of having a denture made form a up big and down small similar mushroom, shown in Figure 14 to 18 greater than the length L 1 of inlaid solid part.Figure 16,17 is depicted as horizontal a kind of of tooth 3 that have a denture made of the utility model mushroom, and the inlaid solid part 31 in the bottom of the horizontal tooth 3 of having a denture made and top exposure part are through step transition, and the step surface edge contour is circular.Figure 14,15 is depicted as horizontal a kind of of tooth 3 that have a denture made of the utility model mushroom, and the inlaid solid part 31 in the bottom of the horizontal tooth 3 of having a denture made and top exposure part are through step transition, and the step surface edge contour is key shape.

As preferred three, the arc that the tooth top of the horizontal tooth 3 of having a denture made raises up for the axis direction along tooth, shown in Figure 13,18, the tooth top of the horizontal tooth 3 of having a denture made is circular-arc.

As preferred four, the tooth top of the horizontal tooth 3 of having a denture made is along the outline line of the tooth top width direction circular arc that is projected as along the axis direction of tooth, and shown in Figure 33,34, it can improve the circularity of gear ring.

As preferred five, the horizontal tooth 3 all or part of interlaced arrangement of having a denture made of the different gear rings on the gear wheel 2.Different gear rings can the number of teeth equate that the horizontal between cog of having a denture made of each of different gear rings is all staggered; But the number of teeth does not wait yet, such as the relative outer ring of inner ring every 2 teeth or more multiple tooth staggered, perhaps 1 at interval and a plurality of promiscuous mode etc.As shown in figure 30, the horizontal tooth 3 of having a denture made of the row of first and second on the gear wheel 2 (leaning on the first row that is of gear wheel bottom surface) gear ring is arranged in the mutual dislocation that makes progress in gear wheel wheel cone week.

As preferred six, the tooth top two ends of the horizontal tooth 3 of having a denture made (along the two ends of tooth top width) are provided with rounding or chamfering, shown in Figure 13,18.

As preferred seven, have at least to have at least a circle tooth to be the horizontal tooth 3 of having a denture made on the gear wheel, and the tooth top angle of deflection of the horizontal tooth of having a denture made of this circle is got the inverse value interlaced arrangement.Tooth top deflection angle with the horizontal tooth 3 of having a denture made on the gear ring is got positive and negative inverse value, and namely the tooth top yawing moment is opposite, and interlaced arrangement.Shown in Figure 31,32, the tooth top angle of deflection of the horizontal tooth 3 of having a denture made of part gear ring is got the inverse value interlaced arrangement on the gear wheel.

As preferred eight, be provided with the dentation vertical bar (being called for short the bar tooth) (such as Figure 21,23,24) that is parallel to the tooth axis on the cylinder of the inlaid solid part 31 of the described horizontal tooth 3 of having a denture made, and the horizontal tooth 3 of having a denture made embeds the mode (such as Figure 20,26) of cutter teeth hole wall by the bar tooth on inlaid solid part 31 cylinders, or the bar tooth is inlaid solid in the perforation of gear wheel 2 (such as Figure 27) with the interference fit of cutter teeth hole formation Multi-point contact type.At this moment, the length of inlaid solid part or width calculate according to the protruding top of the bar tooth profile of its cross section, and as shown in figure 19, the length of inlaid solid part or width are profile zone that 311(surrounds, the protruding top of bar tooth) length or width.

As more preferably A arbitrary among basic example and preferred to eight, the deviant of each gear wheel on the bit body 1 is not more than 1.5% of bit diameter.

As more preferably B arbitrary among basic example and preferred to eight, 4 minutes addendum thicknesses of the horizontal tooth 3 of having a denture made on the gear wheel 2 are not more than 25% of the inlaid solid partial width of tooth, shown in Figure 11,15,17.

Further preferred as more preferably A or B, has 50% the horizontal tooth 3 of having a denture made of gear ring employing on the bit body 1 at least, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 85 °≤| α |≤90 °, and the deviant of gear wheel is not more than 0.5% of bit diameter on the bit body 1.More preferably, has 50% the horizontal tooth 3 of having a denture made of gear ring employing on the bit body 1 at least, and the tooth top angle of deflection of the horizontal tooth 3 of having a denture made=90 ° (addendum line that is the horizontal tooth 3 of having a denture made is vertical with the wheel cone nut line of gear wheel), and gear wheel is not offset (deviant is 0) on the bit body 1, shown in Fig. 1,2,8,29,30.More preferably, the horizontal tooth 3 of having a denture made is inner sunken face (such as Figure 28) along two sides on the thick direction of tooth top, and 4 minutes addendum width W of tooth are not less than the inlaid solid partial width W1 of tooth, 4 minutes addendum thicknesses are not more than 25% of the inlaid solid partial width W1 of tooth, as shown in figure 17.

What need special declaration is; more than basic example and each preferably both be some embodiment of the present utility model; also be various optional enforcement means simultaneously; those skilled in the art as can be known; above-mentioned various optional enforcement means can be carried out various feasible independent assortments; can produce more embodiment thus, it all should be in protection domain of the present utility model, and in order to support the protection of claim:

Such as, any combination between preferred to eight can become some embodiment; And even, preferred one more preferably (as, have at least 1 gear ring to adopt all horizontal teeth 3 of having a denture made at least one gear wheel 2 on the bit body 1, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel on the bit body 1 has at least 1 gear ring to adopt the horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel on the bit body 1 has at least 1 gear ring to adopt 4 minutes addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width of the inlaid solid part of tooth, and the span of the tooth top angle of deflection of the horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Etc.), also can and any combination between preferred two to eight, become more embodiment.Do not do more limit for example at this, those skilled in the art are other more combinations as can be known.

All any modifications of within spirit of the present utility model and principle, doing, make up, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (12)

1. disc type insert bit, comprise bit body (1), at least one gear wheel (2), it is characterized in that: the upper inlaid solid horizontal tooth of having a denture made (3) that has of described gear wheel (2), and the span of the tooth top angle of deflection of the horizontal tooth of having a denture made (3) be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part (31) of the horizontal tooth of having a denture made is non-circular.

2. disc type insert bit as claimed in claim 1, it is characterized in that: have 1 gear ring at least at least one gear wheel (2) on the described bit body (1), the ratio that the above the horizontal tooth of having a denture made (3) number of gear ring accounts for place gear ring tooth number is at least 50%, and 4 minutes addendum widths of the horizontal tooth of having a denture made (3) are not less than the width of the inlaid solid part of tooth (31).

3. disc type insert bit as claimed in claim 1, it is characterized in that: the dentation vertical bar that is provided with the axis that is parallel to tooth on the cylinder of the inlaid solid part (31) of the described horizontal tooth of having a denture made (3), and the horizontal tooth of having a denture made (3) is by the mode of the embedding of the dentation vertical bar on inlaid solid part (31) cylinder gear wheel (2) perforation wall, or the interference fit of dentation vertical bar and gear wheel (2) perforation formation Multi-point contact type is inlaid solid in the perforation of gear wheel (2).

4. disc type insert bit as claimed in claim 1 is characterized in that: all or part of interlaced arrangement of the horizontal tooth of having a denture made (3) of the different gear rings on the described gear wheel (2).

5. disc type insert bit as claimed in claim 1 is characterized in that: have at least to have at least a circle tooth to be the horizontal tooth of having a denture made (3) on the described gear wheel (2), and the tooth top angle of deflection of the horizontal tooth of having a denture made of this circle (3) is got the inverse value interlaced arrangement.

6. disc type insert bit as claimed in claim 1, it is characterized in that: 4 minutes addendum widths of the described horizontal tooth of having a denture made (3) are more than or equal to the length of inlaid solid part (31).

7. the disc type insert bit described in arbitrary claim in the claim 1 to 6, it is characterized in that: 4 minutes addendum thicknesses of the horizontal tooth of having a denture made (3) on the described gear wheel (2) are not more than 25% of the inlaid solid part of tooth (31) width.

8. the disc type insert bit described in arbitrary claim in the claim 1 to 6, it is characterized in that: the deviant of each gear wheel (2) on the described bit body (1) is not more than 1.5% of bit diameter.

9. disc type insert bit as claimed in claim 7, it is characterized in that: have 50% the gear ring employing horizontal tooth of having a denture made (3) on the described bit body (1) at least, the span of the tooth top angle of deflection of the horizontal tooth of having a denture made (3) be 85 °≤| α |≤90 °, and the deviant of the upper gear wheel (2) of bit body (1) is not more than 0.5% of bit diameter.

10. disc type insert bit as claimed in claim 8, it is characterized in that: have 50% the gear ring employing horizontal tooth of having a denture made (3) on the described bit body (1) at least, the span of the tooth top angle of deflection of the horizontal tooth of having a denture made (3) be 85 °≤| α |≤90 °, and the deviant of the upper gear wheel (2) of bit body (1) is not more than 0.5% of bit diameter.

11. disc type insert bit as claimed in claim 9, it is characterized in that: the described horizontal tooth of having a denture made (3) is inner sunken face along two sides on the thick direction of tooth top, and 4 minutes addendum widths of tooth are not less than the inlaid solid part of tooth (31) width, 4 minutes addendum thicknesses are not more than 25% of the inlaid solid part of tooth (31) width.

12. disc type insert bit as claimed in claim 10, it is characterized in that: the described horizontal tooth of having a denture made (3) is inner sunken face along two sides on the thick direction of tooth top, and 4 minutes addendum widths of tooth are not less than the inlaid solid part of tooth (31) width, 4 minutes addendum thicknesses are not more than 25% of the inlaid solid part of tooth (31) width.

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