CN201399471Y - Structure of nodular graphite cast iron roller - Google Patents

Abstract

The utility model relates to a structure of a nodular graphite cast iron roller, which comprises a roller body. The nodular graphite cast iron roller is structurally characterized in that a steel jacket is sheathed outside the outer circumference of the roller body, and the outer circumferential wall of the steel jacket is coated with a wear layer. The structure of the nodular graphite cast iron roller provided by the utility model solves the problem of relative rotation airing from the gap between the steel jacket and the cast iron core part due to the difference of expansion coefficient, sothat the occurrences of potential safety hazards or production faults are reduced. In addition, the nodular graphite cast iron roller has the advantages of simple structure, convenient manufacturing,prolonged service life, reduced production cost, and so on.

Description

A kind of spheroidal graphite cast-iron roller structure

Technical field

The utility model belongs to a kind of drive disk assembly, particularly relates to a kind of spheroidal graphite cast-iron roller structure.

Background technology

The roller that is used at present on the steel rolling production-line generally adopts 45# steel or spheroidal graphite cast-iron, and it can be directly carries out the 45# steel processing behind the surfacing with the plasma spray welding technology and get final product, because the linear expansion coefficient of 45# steel is big, distortion is big, does not meet the technological requirement at this position.And the direct surfacing of spheroidal graphite cast-iron, at the roller of making by ductile cast iron material, we have taked the cast iron roller is carried out machining like this, and the seamless steel sleeve 20# steel assembling back processing tube reducing of the light level of overcoat stationary fit carries out surfacing, is worked into standard size then.Find because spheroidal graphite cast-iron is different with the spray welding technology of 20# steel, and the coefficient of expansion of 20# steel is 13 through experiment, and the coefficient of expansion of cast iron is 11.6.Because the coefficient of expansion of steel bushing is big, greater than the coefficient of expansion of core cast iron, and external temperature is higher, cause between steel bushing and the cast iron core and produce the gap, and produce relative rotation, thus even scurry out generation potential safety hazard or production fault.

Summary of the invention

The utility model provides a kind of simple in structure, easily manufactured, spheroidal graphite cast-iron roller structure of increasing the service life for solving the technical problem that exists in the known technology.

The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is:

A kind of spheroidal graphite cast-iron roller structure comprises roll body, it is characterized in that: described roll body excircle is set with steel bushing, is coated with one deck wearing layer on the outer circle wall of steel bushing.

The utility model can also adopt following technical measures:

Adopt interference fit between described roll body and the steel bushing.

Pin is installed in the radially uniform pin-and-hole that is processed with on the described roll body, pin-and-hole, and the pin other end connects steel bushing.

The wearing layer thickness that applies on the outer circle wall of described steel bushing is between 4mm～8mm.

Advantage and the good effect that the utlity model has are: because the utility model is set with steel bushing at the roll body excircle, be coated with one deck wearing layer on the outer circle wall of steel bushing.Therefore the utility model has solved by coefficient of expansion difference, and cause between steel bushing and the cast iron core and produce the gap, and the phenomenon that produces relative rotation, thereby reduce the generation that produces potential safety hazard or production fault; In addition the utility model also have simple in structure, easily manufactured, advantage such as increase the service life, reduce production costs.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an A-A cutaway view among Fig. 1.

Among the figure: 1, roll body; 2, steel bushing; 3, wearing layer; 4, pin.

The specific embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:

Embodiment:

See also Fig. 1 and Fig. 2,

A kind of spheroidal graphite cast-iron roller structure, comprise roll body 1, be set with steel bushing 2 at roll body 1 excircle, adopt slight interference fit between its roll body 1 and the steel bushing 2, be coated with one deck wearing layer 3 on the outer circle wall of steel bushing 2, wearing layer thickness is between 4mm～8mm, and the utility model can be according to the degree of wear of original spheroidal graphite cast-iron roller, select the thickness of wearing layer and steel bushing, thereby make the roller after the wearing and tearing utilize once more; In order to prevent to take place between steel bushing 2 and the roll body 1 to rotate mutually, pin 4 is installed in the radially uniform pin-and-hole that is processed with on the roll body 1, pin-and-hole, pin 4 other ends connect steel bushing 2.Therefore the utility model has solved by coefficient of expansion difference, and cause between steel bushing and the cast iron core and produce the gap, and the phenomenon that produces relative rotation, thereby reduce the generation that produces potential safety hazard or production fault; In addition the utility model also have simple in structure, easily manufactured, advantage such as increase the service life, reduce production costs.

Claims (4)

1. a spheroidal graphite cast-iron roller structure comprises roll body, it is characterized in that: described roll body excircle is set with steel bushing, is coated with one deck wearing layer on the outer circle wall of steel bushing.

2. spheroidal graphite cast-iron roller structure according to claim 1 is characterized in that: adopt interference fit between described roll body and the steel bushing.

3. spheroidal graphite cast-iron roller structure according to claim 1 is characterized in that: pin is installed in the radially uniform pin-and-hole that is processed with on the described roll body, pin-and-hole, and the pin other end connects steel bushing.

4. spheroidal graphite cast-iron roller structure according to claim 1 is characterized in that: the wearing layer thickness that applies on the outer circle wall of described steel bushing is between 4mm～8mm.

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