CN204002566U - Rock bit - Google Patents
Rock bit Download PDFInfo
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- CN204002566U CN204002566U CN201420468779.5U CN201420468779U CN204002566U CN 204002566 U CN204002566 U CN 204002566U CN 201420468779 U CN201420468779 U CN 201420468779U CN 204002566 U CN204002566 U CN 204002566U
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- gear wheel
- ring
- cone metal
- bit leg
- bit
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Abstract
The utility model relates to drilling tool technical field, relate in particular to a kind of rock bit, comprise gear wheel, bit leg axle and for by described gear wheel and the fixing locking ball of bit leg axle, the root of described gear wheel is provided with gear wheel dead eye, in described gear wheel dead eye, be provided with bearing seal system, described bearing seal system is by cone metal joint ring, bit leg metallic packing ring, cone metal rubber seal, the energy supply of cone metal ring forms with wavy spring, described cone metal rubber seal is positioned at described cone metal joint ring one side, for sealing the gap between cone metal joint ring and gear wheel dead eye.The utility model by taking to top ripple spring as main or all by the metal end face seal system to top ripple spring energy supply, seal face can accurately be controlled specific contact pressure, specific contact pressure is larger and constant lastingly.
Description
Technical field
The utility model relates to drilling tool technical field, relates in particular to a kind of rock bit.
Background technology
Rock bit is a kind of instrument of fractured rock in the earth's crust, the fields such as extensive use and oil, gas drilling and the probing of other mineral resources and exploitation.
The analysis that tricone bit was lost efficacy shows; the damage of bearing is the principal mode that rock bit lost efficacy; and the overwhelming majority that bearing lost efficacy is in advance because bearing seal system lost efficacy; causing bearing lubrication grease to run off differently enters to invade bearing and causes; therefore we often can see rock bit tooth wear not serious, and bearing but lost efficacy and spacious moving phenomenon.
As everyone knows, the elasticity that sealing system now is all utilized hydrogenated nitrile-butadiene rubber (HNBR) provides energy for sealed working face, hydrogenated nitrile-butadiene rubber (HNBR) is in chemical resistance, compress permanent deformation elasticity forever, and tearing strength aspect has excellent performance, but in drilling well occasion under continuous well circulating temperature on 120 DEG C, hydrogenated nitrile-butadiene rubber (HNBR) material elements that is used to sealing system energy supply will be accelerated aging and lost efficacy (must competing hydrogenated nitrile-butadiene rubber (HNBR) vulcanization forming temperature just 170 DEG C), once haveing suffered sealing system, the inefficacy of sealing system rubber element will collapse immediately under the bad working environments of down-hole, cause bearing failure drill bit report degree, will lead to down-hole accident if can not find in time.
The specific contact pressure of sealing surface is the key parameter of metal end face seal and rubber seal.If the too little just envelope of specific pressure is incessantly, the excessive work plane of specific pressure quick abrasion, the life-span is short.The sealing system work plane newly installing has certain specific contact pressure, and it at least must be greater than seal pressure differential, otherwise must leak undoubtedly, and along with the progress of work of sealing system, hydrogenated nitrile-butadiene rubber (HNBR) original paper of sealing system can aging and wearing and tearing.Therefore new clothes drill bit specific contact pressure can be larger, large how many guarantees seal does not leak, this will see the width of sealing surface, material property, surface configuration and the roughness on both sides, the quality (water, oil, mud, grease or air) of rock bit operating mode medium, pressure, temperature etc. condition, the medium of bearing seal system inner side is high viscosity bearing grease, and outside is the mud containing landwaste.The tens of MPa of environment stress scope, temperature range is tens of to more than 100 degrees Celsius, under above-mentioned these conditions, the drill bit of different model will be faced different operating modes, how accurate for the rock bit sealing system of different model provides sealing surface constant lasting specific contact pressure, be the key point of sealing system.To be engaged in the problem that industry project planner must do.
When Fig. 1 is 12 1/4 inches of tricone bit bearing assembles of certain type, the specific contact pressure of sealing system work plane and the change in displacement of sealing system, this curvilinear statistical graph is to collect 100 results that drill bit is tested on metal sealing racking machine.From above statistical form, can find, same sealing system (the each component size of sealing system is all by designing requirement manufacture, and qualified after testing) displacement 1.45-2mm, sealing surface specific contact pressure is from 50KG-90KG, and excursion is very large.Illustrate that sealing system now can not accurately control the specific contact pressure of sealing system.
Utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned technology, and a kind of rock bit is provided, and improves the sealing performance of sealing system.
The utility model for achieving the above object, by the following technical solutions:
A kind of rock bit, comprise gear wheel, bit leg axle and for by described gear wheel and the fixing locking ball of bit leg axle, the root of described gear wheel is provided with gear wheel dead eye, in described gear wheel dead eye, be provided with bearing seal system, it is characterized in that: described bearing seal system is by cone metal joint ring, bit leg metallic packing ring, cone metal rubber seal, the energy supply of cone metal ring forms with wavy spring, described cone metal joint ring and the bit leg metallic packing ring composition end face seal structure that contacts, described cone metal joint ring middle part is with fluted, the energy supply of described cone metal ring is placed in described groove with wavy spring, the energy supply of cone metal ring touches with the inwall of wavy spring top and described gear wheel dead eye, described cone metal rubber seal is positioned at described cone metal joint ring one side, for sealing the gap between cone metal joint ring and gear wheel dead eye.
Preferably, the cross section of described bit leg metallic packing ring is square.
Preferably, the cross section of described bit leg metallic packing ring is trapezoidal, is provided with bit leg metal ring rubber energy supply circle between described bit leg metallic packing ring and described bit leg axle.Operative end surface essence is spread out to minute surface, and can have coating or there is no coating, and inner side is that chamfered surface sandblast prevents that for rubber energy supply circle is installed rubber ring from rotating.
Preferably, described cone metal joint ring and bit leg metallic packing ring form by the stainless tool steel of high-strength alloy is refining, and operative end surface essence is spread out into minute surface, and flatness is less than 0.005mm, and roughness is less than 0.2.
Preferably, the energy supply of described cone metal ring is rolled up rich, stacking forming with wavy spring continuously by high-strength alloy Stainless Steel lenticular wire material one circle.
The beneficial effects of the utility model are: compared with prior art, the utility model by taking to top ripple spring as main or all by the metal end face seal system to top ripple spring energy supply, seal face can accurately be controlled specific contact pressure, specific contact pressure is larger and constant lastingly, although can produce the gear wheel axial vibration causing because of bearing axial clearance when rock bit work, the drill bit that journal offset causes slides, and the thousands of meters of vibrations that elasticity roofbolt causes, can carry out in time kinetic energy supply, simultaneously because the main energy supply element of sealing system is rigidity element, rigidity curve smoothing, displacement is large, so sealing system is high temperature resistant, life-span is long.
Brief description of the drawings
Specific contact pressure curvilinear statistical graph when Fig. 1 is 100 drill bit assemblings of existing metal end face seal system;
Fig. 2 is to top wavy spring structural representation;
Fig. 3 is the lateral view of Fig. 2;
Fig. 4 is 100 rigidity curvilinear statistical graphs to top wavy spring;
Fig. 5 is existing metal end face sealing structure figure;
Fig. 6 is the partial enlarged drawing of Fig. 5;
Fig. 7 is that wavy spring energy supply belongs to end face seal the first structure entirely;
Fig. 8 is the partial enlarged drawing of Fig. 7;
Fig. 9 is that wavy spring energy supply belongs to end face seal the second structure entirely;
Figure 10 is the partial enlarged drawing of Fig. 9.
Detailed description of the invention
Describe detailed description of the invention of the present utility model in detail below in conjunction with accompanying drawing and preferred embodiment.As shown in Figure 7 and Figure 8, a kind of rock bit, comprise gear wheel, bit leg 2 and for by described gear wheel and the fixing locking ball 9 of bit leg, the root of described gear wheel is provided with gear wheel dead eye 1, in described gear wheel dead eye, be provided with bearing seal system, described bearing seal system is by cone metal joint ring 3, bit leg metallic packing ring 4, cone metal rubber seal 6, the energy supply of cone metal ring forms with wavy spring 7, described cone metal joint ring and the bit leg metallic packing ring composition end face seal structure that contacts, described cone metal joint ring middle part is with fluted, the energy supply of described cone metal ring is placed in described groove with wavy spring, the energy supply of cone metal ring touches with the inwall of wavy spring top and described gear wheel dead eye, described cone metal rubber seal is positioned at described cone metal joint ring one side, for sealing the gap between cone metal joint ring and gear wheel dead eye.
As shown in Figures 2 and 3, be from a kind of bearing seal system for 8 1/2 inches of tricone bit metal end faces of external customization to top wavy spring, inspect 100 end flat degree by random samples and be all less than 0.1mm, apparent size is accurate, Fig. 4 is with batch 100 rigidity curvilinear statistical graphs that top wavy spring is tested out on metal sealing racking machine, from scheming, can find out that displacement and load variations scope are very little, almost consistent.And rigidity curve smoothing, displacement range is large, provides energy high.Therefore for novel wavy spring energy supply metal end spherical bearing sealing system, can accurately control the specific contact pressure of sealing system.
As shown in Figure 9 and Figure 10, the cross section of described bit leg metallic packing ring is square.
As shown in Figure 7 and Figure 8, the cross section of described bit leg metallic packing ring is trapezoidal, is provided with bit leg metal ring rubber energy supply circle 5 between described bit leg metallic packing ring and described bit leg axle.Operative end surface essence is spread out to minute surface, and can have coating or there is no coating, and inner side is that chamfered surface sandblast prevents that for rubber energy supply circle is installed rubber ring from rotating.
Described cone metal joint ring and bit leg metallic packing ring form by the stainless tool steel of high-strength alloy is refining, and operative end surface essence is spread out into minute surface, and flatness is less than 0.005mm, and roughness is less than 0.2.
The energy supply of described cone metal ring is rolled up rich, stacking forming with wavy spring continuously by high-strength alloy Stainless Steel lenticular wire material one circle.For metallic packing ring provides kinetic energy.Metallic packing ring is 1 or many, the effect fitting together when the work of metal end face inside and outside isolation bearing is got in axle reverse rotation.Described bit leg metal ring rubber energy supply circle, cone metal rubber seal are by the full hydrogenated nitrile-butadiene rubber system of closing of height.
Concrete installation steps are as follows: first clean gear wheel dead eye, bit leg axle and all sealing system original papers and dry up with clean gas, leaving in respectively on special clean container or workbench;
Second step is assemblied in cone metal joint ring, cone metal rubber seal and the energy supply of cone metal ring in the gear wheel dead eye of gear wheel bearing with wavy spring;
The 3rd step is fixed on bit leg axle on metal sealing racking machine, center line and the metal sealing racking machine axis of bit leg axle are harmonious, bit leg metallic packing ring, bit leg metal ring rubber energy supply circle are then installed, after installation, machinery oil ， Shang oil level in bit leg metallic packing ring operative end surface Shang Shang tri-Shang cleaning is put evenly;
The 4th step is sleeved on the gear wheel bearing integral after having assembled on bit leg axle along bit leg axis;
Whether the 5th step meets the requirements with load (specific contact pressure) and the displacement curve of metal sealing racking machine survey line sealing system, changes sealing original paper as do not met, and ressembles, until meet designing requirement;
Locking steel ball and plug pin are finally installed, and are welded and fixed plug pin 8.Can will be installed in gear wheel axis hole with wavy spring with cone metal ring function by above-mentioned mounting method, rapid and convenient, increases work efficiency.
Compared with prior art, the utility model by taking to top ripple spring as main or all by the metal end face seal system to top ripple spring energy supply, seal face can accurately be controlled specific contact pressure, specific contact pressure is larger and constant lastingly, although can produce the gear wheel axial vibration causing because of bearing axial clearance when rock bit work, the drill bit that journal offset causes slides, and the thousands of meters of vibrations that elasticity roofbolt causes, can carry out in time kinetic energy supply, simultaneously because the main energy supply element of sealing system is rigidity element, rigidity curve smoothing, displacement is large, so sealing system is high temperature resistant, life-span is long.
The above is only preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. a rock bit, comprise gear wheel, bit leg axle and for by described gear wheel and the fixing locking ball of bit leg axle, the root of described gear wheel is provided with gear wheel dead eye, in described gear wheel dead eye, be provided with bearing seal system, it is characterized in that: described bearing seal system is by cone metal joint ring, bit leg metallic packing ring, cone metal rubber seal, the energy supply of cone metal ring forms with wavy spring, described cone metal joint ring and the bit leg metallic packing ring composition end face seal structure that contacts, described cone metal joint ring middle part is with fluted, the energy supply of described cone metal ring is placed in described groove with wavy spring, the energy supply of cone metal ring touches with the inwall of wavy spring top and described gear wheel dead eye, described cone metal rubber seal is positioned at described cone metal joint ring one side, for sealing the gap between cone metal joint ring and gear wheel dead eye.
2. rock bit according to claim 1, is characterized in that: the cross section of described bit leg metallic packing ring is square.
3. rock bit according to claim 1, is characterized in that: the cross section of described bit leg metallic packing ring is trapezoidal, is provided with bit leg metal ring rubber energy supply circle between described bit leg metallic packing ring and described bit leg axle.
4. rock bit according to claim 1, is characterized in that: described cone metal joint ring and bit leg metallic packing ring form by the stainless tool steel of high-strength alloy is refining, and operative end surface essence is spread out into minute surface, and flatness is less than 0.005mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420468779.5U CN204002566U (en) | 2014-08-20 | 2014-08-20 | Rock bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420468779.5U CN204002566U (en) | 2014-08-20 | 2014-08-20 | Rock bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204002566U true CN204002566U (en) | 2014-12-10 |
Family
ID=52042586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420468779.5U Active CN204002566U (en) | 2014-08-20 | 2014-08-20 | Rock bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204002566U (en) |
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2014
- 2014-08-20 CN CN201420468779.5U patent/CN204002566U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |