CN2732816Y

CN2732816Y - Milling-planing tool for paving

Info

Publication number: CN2732816Y
Application number: CN 200420035225
Authority: CN
Inventors: 涂建刚; 徐婷
Original assignee: Zhuzhou Cemented Carbide Group Co Ltd
Current assignee: Zhuzhou Cemented Carbide Group Co Ltd
Priority date: 2004-03-03
Filing date: 2004-03-03
Publication date: 2005-10-12
Anticipated expiration: 2014-03-03

Abstract

The utility model discloses a double hard alloy milling-planing tool for paving, comprising a hard alloy head whose outer surface is a surface of rotation, a knife handle, a spring sleeve and a load-off ring. The spring sleeve and the unloading ring are all sheathed on the knife handle, the hard alloy head matches with the convex spherical surface of the head of the knife handle through the lower concave spherical surface thereof, and the maximum diameter of the concave spherical surface is 3-33mm and the deepness of the concave spherical surface is 1-15mm. Or the hard alloy head matches with the concave cone surface of the knife handle head through the lower convex cone table thereof, the coning of which is 78 degrees-178 degrees. The hard alloy head and the knife handle are connected at a welding manner after assuring the same axiality. The diameter of the head section at the top side of the knife handle is not greater than the diameter of the lower base surface of the hard alloy head by 8mm and the R value of the radius of the surface of rotation of the hard alloy head outer surface is 5-28mm. The milling-planing tool for paving of the utility model is reasonable in stress. The shearing component force of the milling-planing impulse resultant force can reach complete balance and can prevent premature wear of the knife handle, the break and the sealing off of the tool at an early stage effectively.

Description

The road-surface milling instrument

Technical field

The utility model relates to the road-surface milling instrument, especially carbide alloy road-surface milling instrument.

Background technology

At present, the automaticity of constructing highway and maintenance is more and more higher, and the application of big-and-middle-sized pavement milling machine is more and more wider, and the modal failure mode of road-surface milling instrument wherein is handle of a knife wearing and tearing, fracture and sealing-off.The milling flexible pavement is used maximum milling instruments and is comprised that external surface is hard alloy head, handle of a knife, spring housing and the unloading ring of the surfaces of revolution, inverted draw cut is opened at its handle of a knife top, and the hard alloy head envelope wherein and with it is welded, because the top of handle of a knife is in the direct impact position of crushed particles, the impact force of bearing is very big, wearing and tearing at first, the degree of wear is also the most serious, thereby causes weld seam exposed, solder side diminishes, the solder side adhesion sharply descends, and finally causes the cutter sealing-off, initial failure occurs.In addition, the shearing component that this structure impact to be made a concerted effort to milling can not complete equipilibrium, easily causes cutter early fracture, sealing-off, influences the application life of entire tool.

The utility model content

The utility model provides the shearing component energy that two kinds of stresses are reasonable, the milling impact is made a concerted effort complete equipilibrium and road-surface milling instrument that can effectively prevent handle of a knife premature wear, instrument early fracture and sealing-off at above-mentioned deficiency.

Road-surface milling instrument of the present utility model comprises that external surface is hard alloy head, handle of a knife, spring housing and the unloading ring of the surfaces of revolution, spring housing is sleeved on the afterbody of handle of a knife, the unloading boxing is connected on the end of spring housing near the handle of a knife afterbody, the boss sphere of the concave spherical surface of hard alloy head by its underpart and the head of handle of a knife coincide after the assurance axiality, with welding manner hard alloy head is connected with handle of a knife; The end face diameter maximum of handle of a knife head is not more than the bottom surface diameter 8mm of hard alloy head.

The concave spherical surface maximum cross-section radius D value of the bottom of described hard alloy head is 3～33mm, and depth value h is 1～15mm.

As another kind of improvement the of the present utility model, the convex cone platform of hard alloy head by its underpart cooperates the assurance axiality with the concave cone face of handle of a knife head after, hard alloy head is connected with handle of a knife with welding manner; The diameter maximum of handle of a knife head top surface 2d is not more than the diameter 8mm of the bottom surface of hard alloy head.

The tapering tapering of the convex cone platform of described hard alloy head bottom is 78 °～178 °.

The planing instrument of two kinds of utility models, the radius R value of the surfaces of revolution of its hard alloy head external surface is 5～28mm.

Because the diameter maximum of handle of a knife head top surface is not more than the bottom surface diameter 8mm of described hard alloy head, and the radius R value of the surfaces of revolution on its external surface is 5～28mm, thereby during control planing road surface, crushed particles flows along the circular curve tangential direction, obtain the optimal flow direction, make crushed particles can not be directly, the high speed impact handle of a knife, significantly reduce the handle of a knife wearing and tearing and lost efficacy.And the boss sphere of the concave spherical surface of employing hard alloy head bottom and handle of a knife head is with certain parameter value (D, h) coincide, or adopt the convex cone platform of hard alloy head bottom to cooperate with the concave cone face of handle of a knife head, both guaranteed coaxial welding, thereby increase the bond strength that the solder side area improves solder side, produce the shearing component that the milling of radial support dynamic balance is impacted when guaranteeing work again, avoid handle of a knife early fracture and sealing-off, cause entire tool to lose efficacy, thereby prolonged the application life of milling instrument.

Description of drawings

Fig. 1 is existing road-surface milling tool construction schematic diagram; L is handle of a knife district the most easy to wear among the figure;

Fig. 2 is the front view of road-surface milling instrument of the present utility model;

Fig. 3 is the flow schematic diagram that Fig. 2 carries out the crushed particles that road-surface milling when work produce;

Fig. 4 is the force analysis figure of Fig. 2 when carrying out road-surface milling; Wherein F1 is the milling impact force, and F2 is a solder bond power, and F3 is the handle of a knife supporting force;

Fig. 5 is that the structure of the hard alloy head of Fig. 2 is amplified sketch; Wherein R is the arc radius of the surfaces of revolution of hard alloy head external surface, and r is the concave spherical surface radius of soffit, and h is the degree of depth;

Fig. 6 is the front view of the another kind of improved form of Fig. 2;

Fig. 7 is the force analysis figure of Fig. 6 when carrying out road-surface milling; Wherein F1 is the milling impact force, and F2 is a solder bond power, and F3 is the handle of a knife supporting force;

Fig. 8 is that the structure of the hard alloy head of Fig. 6 is amplified sketch; Wherein a is the convex cone platform tapering of hard alloy head.

The specific embodiment:

As Fig. 2, shown in Figure 6, road-surface milling instrument of the present utility model, comprise that external surface is hard alloy head 1, handle of a knife 2, spring housing 3 and the unloading ring 4 of surfaces of revolution 1c, spring housing 3 is sleeved on the afterbody 2b of handle of a knife 2, unloading ring 4 is welded on the end of spring housing 3 near handle of a knife afterbody 2b, the concave spherical surface 1a that hard alloy head 1 passes through its underpart interconnects with welding manner cooperate the assurance axiality with the boss sphere 2c of handle of a knife head 2a after; The diameter of the end face 2d of handle of a knife head 2a can be greater than or less than the diameter of the bottom surface 1b of hard alloy head 1, but maximum is not more than 8mm.

Concave spherical surface maximum cross-section diameter D value on the bottom of hard alloy head 1 is 3～33mm, and depth value is between 1～15mm.

As another kind of improvement the of the present utility model, see Fig. 6, Fig. 7, Fig. 8.After wherein the boss sphere 2c of the hard alloy head 1 concave spherical surface 1a by its underpart and handle of a knife head 2a coincide the assurance axiality, interconnect with welding manner; The diameter of the end face 2d of handle of a knife head 2a can be greater than or less than the diameter of the bottom surface 1b of hard alloy head 1, but maximum is not more than 8mm.

The tapering of the convex cone platform 1a of hard alloy head 1 bottom is 78 °～178 °.

The planing instrument of above-mentioned two kinds of forms, the radius R value of surfaces of revolution 1c is all between 5～28mm on the external surface of its hard alloy head 1.

From Fig. 2 or Fig. 3 and Fig. 4, Fig. 5 as can be seen, because the diameter maximum of handle of a knife head top surface is not more than the bottom surface diameter 8mm of hard alloy head, and the radius R value of the surfaces of revolution 1c on its external surface is 5～28mm, tool work direction when N1 is the planing road surface, thereby the control crushed particles flows along the circular curve tangential direction, be that N2 is the flow direction of crushed particles, this optimal flow direction make crushed particles can not be directly, the high speed impact handle of a knife, significantly reduce the handle of a knife wearing and tearing and lost efficacy.And the boss sphere of the concave spherical surface of employing hard alloy head bottom and handle of a knife head is with certain parameter value (D, h) coincide, or adopt the convex cone platform of hard alloy head bottom to cooperate with the concave cone face of handle of a knife head, both guaranteed coaxial welding, thereby increase the bond strength that the solder side area improves solder side, produce the shearing component that the milling of radial support dynamic balance is impacted when guaranteeing work again, avoid handle of a knife early fracture and sealing-off and cause entire tool to lose efficacy, thereby prolonged the application life of milling instrument.

Claims

1, a kind of road-surface milling instrument, comprise that external surface is hard alloy head (1), handle of a knife (2), spring housing (3) and the unloading ring (4) of the surfaces of revolution (1c), spring housing (3) is sleeved on the afterbody (2b) of handle of a knife (2), unloading ring (4) is sleeved on the end of spring housing (3) near handle of a knife afterbody (2b), it is characterized in that: the boss sphere (2c) of the concave spherical surface (1a) of described hard alloy head (1) by its underpart and the head (2a) of described handle of a knife (2) is connected hard alloy head (1) with welding manner after coincideing and guaranteeing axiality with handle of a knife (2); The diameter maximum of the end face (2d) of described handle of a knife head (2a) is not more than bottom surface (1b) the diameter 8mm of described hard alloy head (1).

2, road-surface milling instrument as claimed in claim 1 is characterized in that: the maximum cross-section diameter D value of the concave spherical surface (1a) of described hard alloy head (1) bottom is 3～33mm, and depth value h is 1～15mm.

3, a kind of road-surface milling instrument, comprise that external surface is hard alloy head (1), handle of a knife (2), spring housing (3) and the unloading ring (4) of the surfaces of revolution (1c), spring housing (3) is sleeved on the afterbody (2b) of handle of a knife (2), unloading ring (4) is sleeved on the end of spring housing (3) near handle of a knife afterbody (2b), it is characterized in that: the convex cone platform (1d) of described hard alloy head (1) by its underpart is connected hard alloy head (1) with welding manner cooperate the assurance axiality with the indent conical surface (2e) of the head (2a) of described handle of a knife (2) after with handle of a knife (2); The diameter maximum of the end face (2d) of described handle of a knife head (2a) is not more than the diameter 8mm of the bottom surface (1b) of described hard alloy head (1).

4, road-surface milling instrument as claimed in claim 3 is characterized in that: the tapering of the convex cone platform (1d) of described hard alloy head (1) bottom is 78 °～178 °.

5, as the described road-surface milling instrument of one of claim 1 to 4, it is characterized in that: the radius R value of the surfaces of revolution (1c) of described hard alloy head (1) external surface is 5～28mm.