RU60701U1 - COOKING ROLLER ROLLER - Google Patents

Abstract

The utility model relates to metallurgical furnaces, in particular, to the roller tables of continuous furnaces of plate mills. The main task solved by the utility model is to reduce production costs and increase productivity by extending the life of the rollers of the furnace rolling table. The proposed roller contains an axis with pins and a drive end and a hollow cylindrical barrel with an inner diameter D and is characterized in that the axis is also hollow with an outer diameter d and with the possibility of installing a pipeline with an outer diameter for cooling water, and between the axis and the barrel there is a thermal insulation in the form of a hollow cylinder, while the drive end of the axis is closed. The value of the d / D ratio can be 0.60 ... 0.62, and the value Where - minimum internal diameter of the axis; as heat insulation can be used asbestos tape with a thickness equal to (0.16 ... 0.17) d.

Description

The utility model relates to metallurgical heating furnaces and can be used in live rolls of continuous furnaces of plate mills.

Currently, rolling hearth furnaces, which may be a continuation of the workshop rolling table, are widely used to heat billets (for example, slabs) of hot rolling mills. Such furnaces are described, for example, in the book by V. A. Krivandin and B. L. Markov “Metallurgical furnaces”, M., “Metallurgy”, 1977, p.325.

The rollers of the furnace rolling tables operate under high temperatures and loads (including dynamic ones), which determines the relative complexity of their design and high cost. The latter circumstance, as well as the direct influence of the performance of the rollers on the productivity of the furnace and hot rolling mill, make the problem of increasing their wear resistance very urgent.

A pulling roller is known, the barrel of which along its length consists of three elements of a certain width with different hardnesses of their surface (see AS USSR No. 1444024 class B 21 D 5/06 C PRIOR.OT 07.07.86). however, this roller is not suitable for use in heating furnaces.

The closest analogue to the claimed object is a roller of the roller conveyor on.with. USSR No. 150470 class B 21 V 24/01, C 21 D 10/02, publ. 10.10.62 g.

This roller for transporting rolled products inside heating furnaces contains an axis with trunnions and a drive end and a hollow cylindrical barrel of a given diameter and is characterized in that the pipe (barrel) is lined with heat-resistant concrete in which the supporting disks are mounted. A roller of this design is unsuitable for a roller table

the continuous kiln of the plate mill, since under dynamic loads at high temperatures it is possible to destroy concrete and deform the support discs with the failure of the roller.

The technical task of this utility model is to reduce production costs and increase productivity by extending the life of the roller.

To solve this problem, the roller roller conveyor roller containing an axis with pins and a drive end and a hollow cylindrical barrel with an inner diameter D, the axis is also hollow with an outer diameter d and with the possibility of installing a pipeline with an outer diameter for cooling water, and between the axis and the barrel there is a thermal insulation in the form of a hollow cylinder, while the drive end of the axis is closed; the value of the d / D ratio can be 0.60 ... 0.62, and the value Where - minimum internal diameter of the axis; as heat insulation can be used asbestos tape with a thickness equal to (0.16 ... 0.17) d.

The above ratios are taken from design considerations and as a result of experimental verification (see below.)

The essence of the proposed technical solution lies in the development of such a design of the roller of the roller conveyor, which allows you to maintain its high performance with minimal production costs.

The proposed roller is schematically shown in figure 1.

Steel hollow barrel 1 roller has a length of ℓ, outer diameter and inner D. The barrel is mounted on the axis 2 and mounted on it with the help of bushings 3. the axis of the roller 2 is hollow, with an outer diameter d = (0.60 ... 0.62) D and an inner one axis length-L. An asbestos heat-insulating tape 4 is installed on the axis, made in the form of a hollow cylinder with an outer diameter internal - d, and tape thickness

At the ends of the axis, trunnions 5 are made for mounting the axis (and roller) in the supports.

The right (in Fig. 1) end 6 of the axis is the drive axis and, on this side, the axis is closed. At the opposite end of the axis, an opening 7 is made for introducing into the cavity of the axis of a removable cooling water pipe (not shown) with an outer diameter .

The video works as follows.

Previously, a pipeline is introduced into the hole 7 of the axis of the assembled and installed in the roller supports and the water supply is turned on (shown by the arrow) to cool the roller. When the roller rotates, the pipeline is stationary (due to the gap between it and the inner surface of the axis), and the used water after flowing out of the pipeline returns along the specified gap from the hole 7 to the highway. Continuous water circulation provides the required cooling of the roller, the intensity of which is controlled by the pressure of the supplied water.

An experimental verification of the proposed roller was carried out in the continuous methodical furnace of the plate mill 2350 of OJSC Magnitogorsk Iron and Steel Works

To this end, when heating slabs of various sizes in the mill furnace, rollers of the proposed design with some variations of their main parameters were installed on the furnace rolling table. In this case, the length ℓ of the barrel of the rollers and its diameter D were the same in all cases, since the value of ℓ is determined by the maximum width of the transported slabs, and the value of D (like the value of the outer diameter) is determined by the maximum load on the roller. The verification results were evaluated by the duration of the working company videos.

The greatest duration of work was shown by the rollers of the proposed design. Deviations from their optimal parameters reduced the wear resistance of the rollers. Thus, an increase in the outer diameter d of the axis (i.e., d / D≥0.62) made it necessary to reduce the thickness

asbestos tape (δ≤0.16 d), which impaired the thermal insulation of the axis and the pipeline and led to overheating of the roller and its premature wear. A decrease in d (i.e., d / D≤0.6) necessitated a reduction in diameter pipeline and the amount of circulating water, which also led to similar negative consequences.

The increase in the gap between the pipelines and the inner surface of the axis causes an unacceptable decrease in the diameter of the pipeline and the amount of water supplied to the roller, and a decrease in the clearance - worsens the circulation (return) of water.

The roller roller table, taken as the closest analogue (see above), was not tested in the experiments because of its unacceptability for transporting hot slabs. Thus, an experimental verification confirmed the acceptability of the technical solution found to achieve the goal and its advantages over a known object.

According to technical and economic studies, the introduction of the proposed method on the plate mill 2350 of OJSC MMK will reduce production costs (by extending the life of the rollers of the furnace rolling table of this mill) by almost 8% and increase the productivity of the mill by at least 5%.

Concrete example

The roller of the furnace roller table of the continuous furnace of the plate mill is used to transport slabs. And has the form shown in figure 1.

The main parameters of the video:

L = 4362 mm; ℓ = 2608 mm; D = 195 mm; d = 0.61 · D = 0.61 · 195≅119 mm; the thickness of the insulation made of asbestos tape δ = 0.165 · d = 0b165 · 119≅20 mm, i.e. outer

diameter of the pipeline introduced into the axis of the roller

Claims (5)

1. The roller of the roller conveyor containing an axis with pins and a drive end and a hollow cylindrical barrel with an inner diameter D, characterized in that the axis is also hollow with an outer diameter d and with the possibility of installing a pipeline with an outer diameter

for cooling water, and between the axis and the barrel there is a thermal insulation in the form of a hollow cylinder, while the drive end of the axis is closed. 2. The roller according to claim 1, characterized in that the ratio d / D = 0.60 ... 0.62. 3. The roller according to claim 1, characterized in that the value

Where

- minimum internal diameter of the axis. 4. The roller according to claim 1, characterized in that asbestos tape is used as thermal insulation. 5. The roller according to claim 4, characterized in that the thickness of the asbestos tape is (0.16 ... 0.17) d.