CN103774714A - Excavator bucket tooth - Google Patents
Excavator bucket tooth Download PDFInfo
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- CN103774714A CN103774714A CN201410063919.5A CN201410063919A CN103774714A CN 103774714 A CN103774714 A CN 103774714A CN 201410063919 A CN201410063919 A CN 201410063919A CN 103774714 A CN103774714 A CN 103774714A
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- bucket tooth
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- log spiral
- work plane
- excavator bucket
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Abstract
The invention discloses an excavator bucket tooth, wherein a front surface, a back surface and two side surfaces are all provided with concave and convex circular arc cambers from tooth top upwards to the middle section; the envelope curves of the concave and convex circular arc cambers are log spiral lines, the poles of the log spiral lines of the front and back surfaces are arranged at the center of a hinge joint hole of an excavator bucket. With the introduction of the log spiral lines, the pressure angle of material and the bucket tooth working surface is consistent, and positive pressure applied to the bucket tooth remains unchanged, so that fracture failure caused by excessive positive pressure is effectively avoided. The contact area of the bucket tooth and the material is reduced due to the design of the concave and convex circular arc cambers, so that the service life of the bucket tooth is effectively prolonged, and the excavating efficiency is improved.
Description
Technical field
The present invention discloses a kind of excavator bucket teeth, divides and belongs to excavator accessory manufacturing technology field by International Patent Classification (IPC) (IPC), especially relates to a kind of excavator teeth that is arranged on power shovel front end.
Background technology
Excavator, claim again excavation machinery, to excavate higher or lower than the material that holds machine side with scraper bowl, and pack haulage vehicle into or unload the earth moving plant to rickyard, from the development of engineering machinery in recent years, the development of excavator is relatively very fast, and excavator has become one of topmost engineering machinery in engineering construction.Excavator bucket teeth is the crucial consumable accessory of excavator, and because it in use directly contacts with ore, sand, rock etc., condition of work is very severe, and application life is short, changes frequently, and consumption is huge.
The bucket tooth of excavator is in the time of contact material, and the effect that both withstood shocks, bears again Moment, and meanwhile, bucket tooth tip is subject to larger impact-sliding abrasive wear, and the various ditch dug with a plow of the normal appearance in surface, tip, distortion, cause surface abrasion or come off.The failure type of bucket tooth has wear out failure and fracture failure etc., and wear out failure is the principal mode that bucket tooth lost efficacy.Therefore, improving the polishing machine of bucket tooth, improve the wear-out life of bucket tooth, is to improve the bucket tooth main path in application life.
At present, engineering machinery field is a lot of to the research of bucket tooth, relevant expert or scholar have proposed the method in multiple prolongation bucket tooth life-span: as improved material property, add alloying element, optimize manufacturing process, bucket tooth surface being carried out to the methods such as specially treated, structure optimization, not only fall flat, improved on the contrary the cost of production of bucket tooth.
Chinese patent literature CN203213189U discloses a kind of excavator bucket teeth with spur layer, a kind of excavator bucket teeth with spur layer of object design of this utility model, be arranged on the overcoat in bucket tooth main body, topping is the spur layer of inverted triangle bur, according to Hertz theory, the bur of inverted triangle is very sharp, be that arc radius R1 is tending towards 0, in the time excavating material, composite curve radius R ' very little (being tending towards 0), inverted triangle cusp wearing and tearing when work, and then generation irregular wear, stressed altering a great deal, inverted triangle bur is destroyed, raising for the life-span is but very limited.During simultaneously due to work, have percussion, inverted triangle bur is also very easily interrupted, and cannot play the anti abrasive effect of overcoat, in addition overcoat the cost and the manufacture difficulty that have improved bucket tooth be set.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of excavator bucket teeth, by the optimal design to bucket tooth work plane, do not changing on the basis of original manufacturing process, utilize tribology theory, improve the polishing machine of bucket tooth, improve and withstand shocks and moment of flexure ability, the life-span of this bucket tooth is significantly increased compared with equivalent material and equal manufacturing process bucket tooth.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of excavator bucket teeth, it is fixedly mounted on power shovel front end, the work plane that bucket tooth comprises positive and negative and both sides, the positive and negative work plane of bucket tooth is respectively along the extension of moving towards of log spiral, and the limit of log spiral is arranged on the hinge hole center of power shovel.
Further, the work plane of bucket tooth both sides respectively along log spiral move towards extend.
Further, the positive and negative work plane of described bucket tooth and both sides work plane are from the crown concave-convex curved surface that upwards distributing to stage casing, the envelope of concave-convex curved surface is log spiral, the limit of positive and negative work plane log spiral is arranged on the hinge hole center of power shovel, the center of rotation that this center is power shovel.
Further, the angle of moving towards of described log spiral is 20 °～50 °, is preferably 25 °～40 °.
Further, each convex surface of described concave-convex curved surface is arc convex surface, and the radius value of each arc convex surface is within the scope of 1～10mm.
Further, each concave surface of described concave-convex curved surface is circular arc concave surface, and the Breadth Maximum of each concave surface is 1～10mm.
Tool of the present invention has the following advantages:
(1) the concavo-convex circular arc camber envelope of bucket tooth main body positive and negative and side is log spiral
1) introducing of log spiral, makes the pressure angle of material and bucket tooth working surface constant, and the suffered normal pressure of bucket tooth remains unchanged, and effectively avoids the fracture failure that causes because normal pressure is excessive, improves the polishing machine of bucket tooth, improves the life-span of bucket tooth.In design process, can be according to different operating modes, the different log spirals that move towards angle of design, guarantee the suffered normal pressure of bucket tooth in scope of design to meet different working condition requirements, particularly excavate compared with boulder and harder rock block etc.;
2) limit of the log spiral of bucket tooth positive and negative is arranged on the center of the hinge hole of power shovel, is the center of rotation of power shovel herein.
(2) bucket tooth main body positive and negative and side are the concavo-convex circular arc camber being smoothly connected
1) concavo-convex curved design has reduced and the contact area of material, becomes line contact by face contact, and the frictional resistance of work reduces greatly;
2) guaranteeing, under the prerequisite of bucket tooth intensity, to design the arc radius of projection corresponding to different operating modes, make material in the time of diverse location, Self-locking angle changes greatly, is conducive to incision.
Accompanying drawing explanation
Fig. 1 is scraper bowl of the present invention and bucket tooth scheme of installation, and it comprises bucket tooth positive and negative logarithm spiral envelope.
Fig. 2 is I place enlarged drawing in Fig. 1.
Fig. 3 is bucket tooth lateral view of the present invention.
Fig. 4 is Fig. 3 top view.
Fig. 5 is Fig. 3 left view.
Fig. 6 is the stressed schematic diagram of the present invention.
Fig. 7 is the arc convex surface Self-locking angle schematic diagram of the concave-convex curved surface of bucket tooth of the present invention.
Fig. 8 is the arc convex surface Self-locking angle schematic diagram of another diameter of the concave-convex curved surface of bucket tooth of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Embodiment: refer to Fig. 1 to Fig. 6, a kind of excavator bucket teeth, it is fixedly mounted on power shovel 1 front end, the work plane 21,22,23,24 that bucket tooth 2 comprises positive and negative and both sides, the positive and negative work plane 21,22 of bucket tooth is respectively along the trend of log spiral 31,32, and the limit of log spiral is arranged on the hinge hole center 100 of power shovel 1.
Fig. 1 to Fig. 6, the positive and negative work plane 21,22 of bucket tooth 2 of the present invention and both sides work plane 23,24 are from the crown concave-convex curved surface that upwards distributing to stage casing, the envelope of concave-convex curved surface is log spiral, the limit of log spiral is arranged on the hinge hole center of power shovel, the center of rotation that this center is power shovel.The angle of moving towards of described log spiral is 20 °～50 °, is preferably 25 °～40 °.Each convex surface 201 of bucket tooth concave-convex curved surface is arc convex surface, and the radius value of each arc convex surface is within the scope of 1～10mm; Each concave surface 202 of concave-convex curved surface is circular arc concave surface, and the Breadth Maximum of each concave surface is 1～10mm.
In the present invention, the positive and negative work plane of bucket tooth is main work plane, and in both sides, each side work plane is to be formed along connecing successively by two sections of cambered surfaces, as shown in Figure 4, two sections of cambered surfaces along corresponding separately log spiral move towards extend.
As shown in Figures 1 to 5, the circular arc camber envelope of bucket tooth main body tow sides 21,22 of the present invention and two sides 23,24 is log spiral, and log spiral polar equation is ρ=ae
θ cot α, wherein a is initial utmost point footpath, and ρ is utmost point footpath, and α is the angle between utmost point footpath and tangent line, and as shown in Figure 1, the circular arc camber envelope of the positive and negative of novel bucket tooth is log spiral, moving towards 25 °, angle is 90 °-α.Because the spacing of arc convex surface is less, while digging the larger material of hook, carry out force analysis, can be obtained by Fig. 6, in the time of two diverse locations, because Self-locking angle Φ 1, Φ 2 are constant, the normal pressure that material acts on bucket tooth keeps constant, avoid forming infinitely-great normal pressure, effectively prevented from fracture failure from reducing wear.Shape and the advantage of log spiral are well known, belong to pioneering but be applied on bucket tooth.Utilize the special character of log spiral, the mining process of Analysis of Complex, in conjunction with the great discovery of tribology and microdeformation, the limit of log spiral is arranged on to the center of rotation (100 places of Fig. 1) of power shovel, creatively solve the breakage problem of bucket tooth.
Log spiral can, according to actual condition, design in conjunction with different bucket tooth specifications.Through test, bucket tooth combination property when log spiral moves towards angle and is 20 °～50 ° is better, can effectively prevent fracture failure, can easily excavate again.
As shown in Figures 1 to 5, the middle leading portion of the positive and negative of bucket tooth and two sides is concavo-convex circular arc camber.The setting of concavo-convex circular arc camber, has greatly reduced the contact area (face contact become line contact) of bucket tooth and material while excavation, and the frictional resistance of excavation reduces greatly.
Fig. 7 and Fig. 8 are that on bucket tooth, two kinds of different (concave-convex curved surface) convex surfaces of diameter contact schematic diagram with material, in Fig. 7, compare at M1 and M2 two places, by analysis, the Self-locking angle at two places changes and (becomes angle β 2 from angle β 1) greatly, material is stressed undergos mutation, from M1 to M2 place, it is large that normal pressure becomes, and occurs plastic strain after material generation elastic deformation at once.According to actual condition, utilize Hertz theory and the research to microdeformation, can design the convex surface radius of circular arc male and fomale(M&F).As shown in Fig. 7 and Fig. 8 two figure, the radius value difference of the arc convex surface of two figure, be respectively 20mm and 50mm, when material W1 and W2 (are to locate from N1 to N2 in Fig. 8 when mobile same distance on arc convex surface M and N, Self-locking angle correspondence is γ 1 and γ 2), the variation difference (angle β 2 and angle γ 2 differences) of Self-locking angle.Therefore, can, meeting under the prerequisite of bucket tooth convex surface intensity, convex surface radius be designed, make material large at the Self-locking angle rate of change of curved surface diverse location, be beneficial to incision.Meanwhile, the position that while considering bucket tooth operation, material contacts with convex surface arc-shaped surface, for preventing fracture failure, can design concave surface.Through the analysis of experiments of multiple specification bucket tooths, the radius of arc convex surface is 1～10mm, is preferably 2～8mm, and the width 1～10mm of concave surface is preferred values, is preferably 2～8mm.In the present invention, concave-convex curved surface can be designed as arbitrary surface, and as sin cos functions curve etc., but circular arc camber is easily processed.
The present invention relates to a kind of excavator bucket teeth, its positive and negative and two sides are from the crown concavo-convex circular arc camber that upwards distributing to stage casing, and the envelope of concavo-convex circular arc camber is log spiral, and the limit of log spiral is arranged on the hinge hole center of power shovel.The introducing of log spiral, makes the pressure angle of material and bucket tooth working surface constant, and the suffered normal pressure of bucket tooth remains unchanged, and effectively avoids the fracture failure causing because normal pressure is excessive.Log spiral can design according to the difference of excavating object, to meet different working condition requirements.And the design of concavo-convex circular arc camber has reduced the contact area of bucket tooth and material, become line contact by face contact, the frictional resistance of work reduces greatly.Guaranteeing, under the prerequisite of bucket tooth intensity, can to design the arc radius of projection corresponding to different operating modes, make material in the time of diverse location, Self-locking angle changes greatly, is conducive to incision.The novel bucket tooth of process Original Architectural Design, under the prerequisite not raising the cost, extends the life-span of bucket tooth effectively, improves digging efficiency.
Comprehensively above-mentioned, this bucket tooth can reach purpose of design.Through the examination of stone ore installation small lot, original structure bucket tooth application life is 4～5 days, and the life-span of novel bucket tooth is that more than 8 days the life-span is more than doubled, and effect is remarkable.
Above record, only, for utilizing the embodiment of this origination techniques content, modification, variation that any those skilled in the art use this creation to do, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (6)
1. an excavator bucket teeth, it is fixedly mounted on power shovel front end, it is characterized in that: the work plane that this bucket tooth comprises positive and negative and both sides, the positive and negative work plane of bucket tooth is respectively along the extension of moving towards of log spiral, and the limit of log spiral is arranged on the hinge hole center of power shovel.
2. excavator bucket teeth according to claim 1, is characterized in that: the work plane of described bucket tooth both sides respectively along log spiral move towards extend.
3. excavator bucket teeth according to claim 1, it is characterized in that: the positive and negative work plane of described bucket tooth and both sides work plane are from the crown concave-convex curved surface that upwards distributing to stage casing, the envelope of concave-convex curved surface is log spiral, the limit of positive and negative work plane log spiral is arranged on the hinge hole center of power shovel, the center of rotation that this center is power shovel.
4. excavator bucket teeth according to claim 1, is characterized in that: the angle of moving towards of described log spiral is 20 °～50 °.
5. excavator bucket teeth according to claim 1, is characterized in that: each convex surface of described concave-convex curved surface is arc convex surface, and the radius value of each arc convex surface is within the scope of 1～10mm.
6. excavator bucket teeth according to claim 1, is characterized in that: each concave surface of described concave-convex curved surface is circular arc concave surface, and the Breadth Maximum of each concave surface is 1～10mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410063919.5A CN103774714B (en) | 2014-02-25 | 2014-02-25 | Excavator bucket teeth |
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| CN201410063919.5A CN103774714B (en) | 2014-02-25 | 2014-02-25 | Excavator bucket teeth |
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| CN103774714A true CN103774714A (en) | 2014-05-07 |
| CN103774714B CN103774714B (en) | 2016-03-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205861U (en) * | 1984-12-24 | 1986-12-17 | 埃斯科公司 | Excavating tooth |
| US5782019A (en) * | 1995-11-29 | 1998-07-21 | H & L Tooth Company | High strength earth working tooth |
| CN2327724Y (en) * | 1998-03-20 | 1999-07-07 | 扬州市天雨给排水设备集团有限公司 | peripheral mud scraper |
| US20040216334A1 (en) * | 2003-04-30 | 2004-11-04 | Esco Corporation | Wear assembly for the digging edge of an excavator |
| CN203701187U (en) * | 2014-02-25 | 2014-07-09 | 厦门华承飞远传动科技有限公司 | Excavator bucket tooth |
-
2014
- 2014-02-25 CN CN201410063919.5A patent/CN103774714B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205861U (en) * | 1984-12-24 | 1986-12-17 | 埃斯科公司 | Excavating tooth |
| US5782019A (en) * | 1995-11-29 | 1998-07-21 | H & L Tooth Company | High strength earth working tooth |
| CN2327724Y (en) * | 1998-03-20 | 1999-07-07 | 扬州市天雨给排水设备集团有限公司 | peripheral mud scraper |
| US20040216334A1 (en) * | 2003-04-30 | 2004-11-04 | Esco Corporation | Wear assembly for the digging edge of an excavator |
| CN203701187U (en) * | 2014-02-25 | 2014-07-09 | 厦门华承飞远传动科技有限公司 | Excavator bucket tooth |
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| Publication number | Publication date |
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| CN103774714B (en) | 2016-03-30 |
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Owner name: TRANF TECHNOLOGY (XIAMEN) CO., LTD. Free format text: FORMER OWNER: XIAMEN HUACHENG FEIYUAN TRANSMISSION TECHNOLOGY CO., LTD. Effective date: 20141103 |
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Effective date of registration: 20141103 Address after: 361000 Fujian Province, Xiamen torch hi tech Zone (Xiangan) Industrial Zone Jianye Building Room L201 Applicant after: Chuan Fu Technology (Xiamen) Co., Ltd. Address before: Siming District of Xiamen City, Fujian province 361000 tzengtsu Longhu Mountain Community Asahi building three room 306 Applicant before: XIAMEN HUACHENG FEIYUAN TRANSMISSION TECHNOLOGY CO., LTD. |
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