Excavator bucket tooth

Abstract

The utility model discloses an excavator bucket tooth which comprises a base body, the base body comprises a tooth tip part, strip-shaped wear-resistant coatings are arranged on the surface of the tooth tip part at intervals, and the wear-resistant coatings are combined with the tooth tip part in a laser cladding mode. The strip-shaped wear-resistant coating is attached to the tooth tip part, so that the wear resistance of the tooth tip part is improved, and the service life of the bucket tooth is prolonged; the wear-resistant coating and a tooth tip base material can be metallurgically bonded through a laser cladding process, and the wear-resistant coating is compact in structure and free of defects such as cracks and air holes; the strip-shaped wear-resistant coatings are cladded on the working surface of the tooth tip part at intervals, so that compared with complete cladding of the surface of the bucket tooth, the bucket tooth has the advantages that the material consumption is reduced, the manufacturing cost is saved, the wear-resistant coatings are prevented from cracking due to excessive cladding heat, and embrittlement and residual stress increase of the tooth tip part of a base body caused by excessive cladding heat are avoided; the service life of the bucket tooth is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to excavator technical field, concretely relates to a kind of excavator bucket tooth. BACKGROUND

[0002] Excavator bucket tooth is the important working component on excavator, is the first part of contact material, wear most seriously, belongs to frequently replaced wearing parts.Especially in mining, ore transfer and other working scenarios, bucket tooth wear is more serious.Bucket tooth is subjected to wear and tear in addition, also receives the impact force of excavator rotation contact material, and the impact force of excavator cutting into material pile instantaneously, so bucket tooth needs to have certain toughness.But single material is generally incompatible in wear resistance and toughness, or its price is expensive when compatible.

[0003] At present, domestic large excavator adopts high manganese steel casting to solve bucket tooth fracture.Single austenite is formed in high manganese steel after water toughening treatment, with higher toughness and plasticity, and hardness is generally in the range of 180-220HB.Under the action of severe impact load and compressive stress, plastic deformation occurs on the stress surface, and then work hardening and hardness increase, thereby improving wear resistance.After impact hardening of high manganese steel, high-carbon martensite is formed on the surface, and the hardness can reach more than 550HB, but the high-carbon martensite is easy to peel off, resulting in low service life.

[0004] Chinese patent document CN 102453911 A discloses a surface strengthening method of excavator bucket tooth, which uses laser cladding to melt and cover a tungsten carbide alloy powder with excellent wear resistance and good toughness on the bucket tooth to form a dense coating metallurgically combined, and the wear resistance of the coating is much higher than that of high manganese steel, thereby greatly improving the service life of the bucket tooth.However, the excavator bucket tooth using laser cladding tungsten carbide alloy powder does not set a reasonable cladding position, and the bucket tooth surface is entirely cladded with tungsten carbide alloy powder, resulting in very high manufacturing cost, and large-area laser cladding heat input will cause the matrix to become brittle and increase residual stress. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problems of overcoming the deficiencies of prior art, and provides an excavator bucket tooth with simple structure, high hardness, good wear resistance and long service life.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An excavator bucket tooth includes a base body, the base body includes a tooth tip part, a strip-shaped wear-resistant coating is arranged on the surface of the tooth tip part, and the wear-resistant coating is combined with the tooth tip part by laser cladding.

[0008] As a further improvement of the above technical solution: the tooth tip part comprises a bottom surface, two oppositely arranged first side surfaces and two oppositely arranged second side surfaces, the first side surfaces and the second side surfaces are connected with the bottom surface, the first side surfaces are connected with the second side surfaces, the distance between the two first side surfaces gradually increases from bottom to top, the two second side surfaces are parallel to each other, the bottom surface is provided with the wear-resistant coating, and the first side surfaces and the second side surfaces are provided with the wear-resistant coating at intervals.

[0009] As a further improvement of the above technical solution: the wear-resistant coating of the second side surface comprises a first wear-resistant coating and two second wear-resistant coatings, the first wear-resistant coating is arranged vertically, and the two second wear-resistant coatings are arranged in a spread shape with the end with a smaller distance being close to the upper end of the first wear-resistant coating.

[0010] As a further improvement of the above technical solution: the wear-resistant coating on the first side surface comprises a plurality of third wear-resistant coatings arranged in parallel, and the third wear-resistant coatings are arranged along the length direction of the first side surface.

[0011] As a further improvement of the above technical solution: the wear-resistant coating of the second side surface comprises a first wear-resistant coating and a plurality of fourth wear-resistant coatings located above the first wear-resistant coating, the first wear-resistant coating is arranged vertically, the fourth wear-resistant coatings are arranged perpendicularly to the first wear-resistant coating, and the fourth wear-resistant coating farther away from the first wear-resistant coating has a longer length.

[0012] As a further improvement of the above technical solution: the wear-resistant coating of the first side surface comprises a plurality of fifth wear-resistant coatings arranged in parallel, and the fifth wear-resistant coatings are arranged along the width direction of the first side surface.

[0013] As a further improvement of the above technical solution: the wear-resistant coating of the second side surface comprises a first wear-resistant coating and two second wear-resistant coatings, the first wear-resistant coating is arranged vertically, the two second wear-resistant coatings are arranged in a spread shape with the end with a smaller distance being close to the upper end of the first wear-resistant coating, and a plurality of fourth wear-resistant coatings are arranged between the two second wear-resistant coatings, the fourth wear-resistant coatings are arranged perpendicularly to the first wear-resistant coating, and the fourth wear-resistant coating farther away from the first wear-resistant coating has a longer length.

[0014] As a further improvement of the above technical solution: the wear-resistant coating of the first side surface comprises two third wear-resistant coatings arranged along the length direction of the first side surface, and a plurality of fifth wear-resistant coatings are arranged between the two third wear-resistant coatings along the width direction of the first side surface.

[0015] As a further improvement of the above technical solution: the wear-resistant coating adopts a metal ceramic composite coating with macro hardness of HRC50-60.

[0016] As a further improvement of the above technical solution: the wear-resistant coating has a height of 5-10mm and a width of 30-50mm.

[0017] Compared with the prior art, the excavator bucket tooth has the advantages that:

[0018] The excavator bucket tooth disclosed by the utility model, through attaching strip wear-resistant coating on the tooth tip part, the wear resistance of the tooth tip part is improved, and the service life of the bucket tooth is prolonged; through the laser cladding process, metallurgical combination between the wear-resistant coating and the tooth tip part base material can be realized, the wear-resistant coating has dense structure and no cracks, pores and other defects; compared with the whole cladding of the bucket tooth surface, the utility model reduces the material consumption, saves the manufacturing cost, avoids the cracking of the wear-resistant coating caused by excessive cladding heat, and avoids the brittleness and residual stress increase of the tooth tip part base caused by excessive cladding heat, thereby improving the service life of the bucket tooth. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic view of the utility model embodiment one.

[0020] Figure 2 It is a structure schematic view of the bottom surface of the utility model embodiment one.

[0021] Figure 3 It is a structure schematic view of the first side surface of the utility model embodiment one.

[0022] Figure 4 It is a three-dimensional structure schematic view of the utility model embodiment two.

[0023] Figure 5 It is a structure schematic view of the bottom surface of the utility model embodiment two.

[0024] Figure 6 It is a structure schematic view of the first side surface of the utility model embodiment two.

[0025] Figure 7 It is a three-dimensional structure schematic view of the utility model embodiment three.

[0026] Figure 8 It is a structure schematic view of the bottom surface of the utility model embodiment three.

[0027] Figure 9 It is a structure schematic view of the first side surface of the utility model embodiment three.

[0028] In the drawing, various reference numerals represent:

[0029] 1, tooth tip; 11, bottom surface; 12, first side surface; 13, second side surface; 3, wear-resistant coating; 31, first wear-resistant coating; 32, second wear-resistant coating; 33, third wear-resistant coating; 34, fourth wear-resistant coating; 35, fifth wear-resistant coating. DETAILED DESCRIPTION

[0030] The utility model will be described further in detail below in combination with the drawings and specific embodiments.

[0031] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0033] In the utility model, unless otherwise specifically defined and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Example one

[0035] As Figures 1 to 3As shown, the excavator tooth of the embodiment comprises a base body, the base body comprises a tooth tip part 1, a strip-shaped wear-resistant coating 3 is arranged on the surface of the tooth tip part 1, and the wear-resistant coating 3 is combined with the tooth tip part 1 by laser cladding. Preferably, the base body is made of high manganese steel, the microstructure of the high manganese steel after water toughening treatment is single austenite, has high toughness and plasticity, and the hardness is generally in the range of 180-220 HB. Under the action of severe impact load and compressive stress, the surface layer deforms plastically, and then work hardens and the hardness increases, thereby improving the wear resistance; and the wear-resistant coating 3 is made of a metal ceramic composite coating with a macro hardness of HRC50-60, the impact wear resistance of the material is improved by more than 3 times, thereby the wear resistance of the tooth can be greatly improved.

[0036] The excavator tooth of the embodiment improves the wear resistance of the tooth tip part 1 by attaching the strip-shaped wear-resistant coating 3 to the tooth tip part 1, and prolongs the service life of the tooth; the wear-resistant coating 3 and the material of the tooth tip part 1 are metallurgically combined by the laser cladding process, the wear-resistant coating 3 has a dense structure and no cracks, pores and other defects; compared with full cladding of the surface of the tooth, the excavator tooth of the embodiment reduces the material consumption, saves the manufacturing cost, avoids cracking of the wear-resistant coating 3 caused by excessive cladding heat, and avoids the brittle of the base body tooth tip part 1 and the increase of residual stress caused by excessive cladding heat, thereby improving the service life of the tooth.

[0037] Further, in the embodiment, the tooth tip part 1 comprises a bottom surface 11, two oppositely arranged first side surfaces 12 and two oppositely arranged second side surfaces 13, the first side surfaces 12 and the second side surfaces 13 are connected with the bottom surface 11, the first side surfaces 12 are connected with the second side surfaces 13, the distance between the two first side surfaces 12 gradually increases from bottom to top, the two second side surfaces 13 are parallel to each other, the bottom surface 11 is provided with the wear-resistant coating 3, and the first side surfaces 12 and the second side surfaces 13 are provided with the wear-resistant coating 3. The two oppositely arranged first side surfaces 12 make the tooth tip part 1 have a tapered structure, which facilitates cutting into the material pile; the wear-resistant coating 3 is distributed on the bottom surface 11, the first side surfaces 12 and the second side surfaces 13 of the tooth tip part 1, which is conducive to improving the wear resistance of the tooth tip part 1, reducing the material consumption, saving the manufacturing cost, avoiding cracking of the wear-resistant coating 3 caused by excessive cladding heat, and avoiding the brittle of the base body and the increase of residual stress.

[0038] Further, in the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and two second wear-resistant coatings 32, the first wear-resistant coating 31 is arranged vertically, and the two second wear-resistant coatings 32 are arranged in a spread shape and the narrow end of the two second wear-resistant coatings 32 is close to the upper end of the first wear-resistant coating 31.

[0039] Further, in the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and two second wear-resistant coatings 32, the first wear-resistant coating 31 is arranged vertically, and the two second wear-resistant coatings 32 are arranged in a spread shape and the narrow end of the two second wear-resistant coatings 32 is close to the upper end of the first wear-resistant coating 31. Figure 3 Further, in the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and two second wear-resistant coatings 32, the first wear-resistant coating 31 is arranged vertically, and the two second wear-resistant coatings 32 are arranged in a spread shape and the narrow end of the two second wear-resistant coatings 32 is close to the upper end of the first wear-resistant coating 31.

[0040] As a preferred embodiment, the height of the wear-resistant coating 3 is 5-10mm (or the thickness is 5-10mm), and the width is 30-50mm, which can effectively increase the wear resistance and save the cladding material, reduce the manufacturing cost, and avoid the defects caused by excessive cladding heat, such as cracking of the wear-resistant coating 3. The length of the wear-resistant coating 3 is adapted to the specification of the tooth tip part 1.

[0041] Embodiment two

[0042] As shown in FIG. 1, the excavator tooth of the utility model comprises a tooth tip part 1 and a tooth root part 2, the tooth tip part 1 is connected with the tooth root part 2, and the tooth tip part 1 comprises a first side surface 12 and a second side surface 13. Figures 4 to 6 As shown in FIG. 1, the excavator tooth of the utility model comprises a tooth tip part 1 and a tooth root part 2, the tooth tip part 1 is connected with the tooth root part 2, and the tooth tip part 1 comprises a first side surface 12 and a second side surface 13.

[0043] In the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and a plurality of fourth wear-resistant coatings 34 (specifically six) above the first wear-resistant coating 31, the first wear-resistant coating 31 is arranged vertically, the fourth wear-resistant coatings 34 are arranged perpendicularly to the first wear-resistant coating 31, and the fourth wear-resistant coatings 34 farther away from the first wear-resistant coating 31 are longer.

[0044] Further, in the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and two second wear-resistant coatings 32, the first wear-resistant coating 31 is arranged vertically, and the two second wear-resistant coatings 32 are arranged in a spread shape and the narrow end of the two second wear-resistant coatings 32 is close to the upper end of the first wear-resistant coating 31.

[0045] In the embodiment, the wear-resistant coating 3 of the first side surface 12 comprises a plurality of fifth wear-resistant coatings 35 arranged in parallel, and the fifth wear-resistant coatings 35 are arranged along the width direction of the first side surface 12.

[0046] The simulation and experiment show that the distribution structure of the wear-resistant coating 3 of the first side surface 12 can comprehensively improve the wear resistance of the first side surface 12, reduce the material usage of the wear-resistant coating 3 of the first side surface 12, save the manufacturing cost, avoid the cracking of the wear-resistant coating 3, the embrittlement of the substrate and the increase of the residual stress caused by excessive cladding heat.

[0047] Embodiment three

[0048] As shown in Figures 7 to 9 Another embodiment of the excavator bucket tooth of the utility model, the excavator bucket tooth of the embodiment is generally similar to the embodiment one and the embodiment two, and the difference lies in that:

[0049] In the embodiment, the wear-resistant coating 3 of the second side surface 13 comprises a first wear-resistant coating 31 and two second wear-resistant coatings 32, the first wear-resistant coating 31 is arranged in the vertical direction, the two second wear-resistant coatings 32 are arranged in the shape of an eight character, the narrow end of the two second wear-resistant coatings 32 is close to the upper end of the first wear-resistant coating 31, a plurality of fourth wear-resistant coatings 34 are arranged between the two second wear-resistant coatings 32, the fourth wear-resistant coatings 34 are arranged perpendicularly to the first wear-resistant coating 31, and the fourth wear-resistant coating 34 is longer as it is farther away from the first wear-resistant coating 31.

[0050] The distribution structure of the wear-resistant coating 3 of the second side surface 13 in the embodiment combines the embodiment one and the embodiment two, and therefore can comprehensively improve the wear resistance of the second side surface 13, reduce the material usage of the wear-resistant coating 3 of the second side surface 13, save the manufacturing cost, avoid the cracking of the wear-resistant coating 3, the embrittlement of the substrate and the increase of the residual stress caused by excessive cladding heat.

[0051] In the embodiment, the wear-resistant coating 3 of the first side surface 12 comprises two third wear-resistant coatings 33, the third wear-resistant coatings 33 are arranged along the length direction of the first side surface 12, and a plurality of fifth wear-resistant coatings 35 are arranged between the two third wear-resistant coatings 33, and the fifth wear-resistant coatings 35 are arranged along the width direction of the first side surface 12.

[0052] The distribution structure of the wear-resistant coating 3 of the first side surface 12 in the embodiment combines the embodiment one and the embodiment two, and therefore can comprehensively improve the wear resistance of the first side surface 12, reduce the material usage of the wear-resistant coating 3 of the first side surface 12, save the manufacturing cost, avoid the cracking of the wear-resistant coating 3, the embrittlement of the substrate and the increase of the residual stress caused by excessive cladding heat.

[0053] Of course, in other embodiments, the metal ceramic composite coatings on the working surfaces of the tooth tip part 1 are arranged and combined in any manner according to the above-mentioned modes, which are also within the protection scope of the application.

[0054] Although the utility model has disclosed as above with preferable embodiments, however, it is not used to limit the utility model. Any skilled person in the art, without departing from the utility model technical scheme range, can utilize the above disclosed technical content to make many possible changes and modifications to the utility model technical scheme, or modify as equivalent variation equivalent embodiment. Therefore, any simple modification, equivalent variation and modification made to the above embodiments according to the utility model technical essence, which does not depart from the utility model technical scheme content, should fall within the scope of the utility model technical scheme protection.

Claims

1. A digging machine pick comprising a base body, said base body comprising a tip portion (1), characterized in that: The tooth tip part (1) is provided with strip-shaped wear-resistant coating (3) on the surface, the wear-resistant coating (3) is combined with the tooth tip part (1) by laser cladding, the tooth tip part (1) includes bottom surface (11), two oppositely arranged first side surfaces (12) and two oppositely arranged second side surfaces (13), the first side surface (12) and the second side surface (13) are connected with the bottom surface (11), the first side surface (12) is connected with the second side surface (13), the distance between the two first side surfaces (12) gradually increases from bottom to top, the two second side surfaces (13) are parallel to each other, the bottom surface (11) is provided with the wear-resistant coating (3), and the first side surface (12) and the second side surface (13) are provided with the wear-resistant coating (3) at intervals.

2. The excavator pick of claim 1, wherein: The wear-resistant coating (3) of the second side surface (13) includes a first wear-resistant coating (31) and two second wear-resistant coatings (32), the first wear-resistant coating (31) is arranged vertically, and the two second wear-resistant coatings (32) are arranged in an eight-shaped manner and the end with a smaller distance is close to the upper end of the first wear-resistant coating (31).

3. The excavator pick of claim 2, wherein: The wear-resistant coating (3) on the first side surface (12) includes a plurality of third wear-resistant coatings (33) arranged in parallel, and the third wear-resistant coatings (33) are arranged along the length direction of the first side surface (12).

4. The excavating machine pick of claim 1, wherein: The wear-resistant coating (3) of the second side surface (13) includes a first wear-resistant coating (31) and a plurality of fourth wear-resistant coatings (34) located above the first wear-resistant coating (31), the first wear-resistant coating (31) is arranged vertically, the fourth wear-resistant coatings (34) are arranged perpendicularly to the first wear-resistant coating (31), and the fourth wear-resistant coatings (34) farther away from the first wear-resistant coating (31) are longer.

5. The excavator pick of claim 4, wherein: The wear-resistant coating (3) of the first side surface (12) includes a plurality of fifth wear-resistant coatings (35) arranged in parallel, and the fifth wear-resistant coatings (35) are arranged along the width direction of the first side surface (12).

6. The excavating machine pick of claim 1, wherein: The wear-resistant coating (3) of the second side surface (13) includes a first wear-resistant coating (31) and two second wear-resistant coatings (32), the first wear-resistant coating (31) is arranged vertically, and the two second wear-resistant coatings (32) are arranged in an eight-shaped manner and the end with a smaller distance is close to the upper end of the first wear-resistant coating (31), and a plurality of fourth wear-resistant coatings (34) are arranged between the two second wear-resistant coatings (32), the fourth wear-resistant coatings (34) are arranged perpendicularly to the first wear-resistant coating (31), and the fourth wear-resistant coatings (34) farther away from the first wear-resistant coating (31) are longer.

7. The excavating pick according to claim 6, wherein: The wear-resistant coating (3) of the first side surface (12) includes two third wear-resistant coatings (33), the third wear-resistant coatings (33) are arranged along the length direction of the first side surface (12), and a plurality of fifth wear-resistant coatings (35) are arranged between the two third wear-resistant coatings (33), and the fifth wear-resistant coatings (35) are arranged along the width direction of the first side surface (12).

8. The excavator pick of any one of claims 1 to 7, characterized in that: The wear-resistant coating (3) is a cermet composite coating with macro hardness of HRC 50-60.

9. The excavator pick of claim 8, wherein: The wear-resistant coating (3) has a height of 5-10 mm and a width of 30-50 mm.

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