GB2305143A - Device for straightening hot-rolled girders or sections - Google Patents

Description

1 2305143 0Device for Straightening Hot-Rolled Girders or SectionsO The

invention relates to a device for straightening hot-rolled girders or sections with a variable straightening-shaft scale or distance between straightening shafts, a horizontal adjustment of the straightening shafts being provided.

In order to be able to use rollers for as many different rolled sections as possible, in the case of devices for straightening hot-rolled girders or sections in which the workpiece to be straightened is passed between adjustable rollers arranged in accordance with the rolled section and mounted transversely to the direction of movement of the workpiece, the straightening rollers are adjustable on their shafts in the known straightening devices.

In 0HUtte, Taschenbuch filr Eisenhilttenleutell [Smelting Works, Handbook for Ironworkers], 5th Edition, 1961, W. Ernst & Sohn Publishing House, pp. 903, 905 and 907, straightening devices are illustrated which are constructed with five, seven or even more straightening rollers. For example, a roller-straightening machine is constructed with seven rollers mounted double for straightening heavy rails, the straightening shafts 2 being mounted at both ends in heavy self-aligning roller bearings. The lower three straightening shafts are adjustable vertically by individual motors, and the upper four straightening shafts are driven by a closed transmission by way of spindles. All seven straightening shafts can be set axially by handwheels.

The straightening of heavy sections by means of devices of this type is illustrated for example in "Das Richten von schweren Profilen" [The Straightening of Heavy Sections], Heinz Schiller, Stahl und Eisen [Steel and Iron] 99 (1979), No. 21, p. 1154. An electromechanical adjustment drive of this type is disadvantageous insofar as the integrated adjustment motors and the complicated spindle adjustment result in a device which is very large, extremely expensive and complicated to maintain.

A mechanical device for adjusting the straightening shafts is known from US patent No. 3,621,693, in which the adjustment is carried out not by way of an adjustment spindle, but by way of toothed racks. In this case, too, a transmission is present which is expensive, large in structure and maintenance-intensive.

The object of the invention is therefore to provide a device for straightening hot-rolled girders or sections with a variable straightening-shaft scale 3 which will permit an adjustment of the straightening shafts, which requires less space, is less complicated and is less expensive.

The object of the invention is attained in that hydraulic adjustment cylinders are provided for adjusting the straightening shafts, and one adjustment cylinder is provided for adjusting two straightening shafts in one plane.

This makes it possible to provide a device of the type described which is inexpensive to produce and in which the space requirement and the maintenance outlay are appreciably lower than in the case of conventional devices.

In addition, it is advantageous for remote indicators to be provided for detecting the adjustment path.

The invention is described below with reference to drawings, in which Fig. 1 is a lateral elevation of the straightening machine; Fig. 2 is a front elevation of the straightening machine, and 4 Figures 3A to 3D are diagrammatic illustrations of the adjustment procedure.

The straightening device according to the invention (Fig. 1, Fig. 2) comprises a plurality of respective upper straightening shafts 1 and lower straightening shafts 2 with straightening rollers which are arranged in the upper straightening-shaft housing 3 and the lower straightening-shaft housing 4 respectively. The device further comprises a front upper crossmeaber 5 and a rear upper cross-member 6, which are secured to lateral supports 7, 8 and a middle support 9.

Clamping cylinders 10 are provided for clamping the straightening shafts, and adjustment cylinders 11 for adjustment, which are conventional massproduced hydraulic cylinders. Two shafts are advantageously adjusted by one adjustment cylinder 11.

The straightening shafts are advantageously driven by way of controllable motors connected directly to the respective straightening shaft by way of a drive shaft 14. This advantageously replaces the drive used in conventional straightening devices with a motor with a transmission. It is also possible, however, for a device according to the invention to be driven in a conventional manner.

The adjustment path of the straightening shafts is advantageously detected by remote indicators 12, 13. An axial adjustment device 15 is further illustrated in Fi g. 2.

Fig. 3 shows the procedure of the horizontal adjustment of two upper straightening shafts 1 with straightening rollers, with the designation II and IV of a roller-straightening machine with a variable straighteningshaft scale.

The variable straightening-shaft scale is necessary in order to straighten as large a number as possible of different profiles with one machine, i.e. small profiles with a small straightening distance and large profiles with a large straightening distance.

In the starting position (Figure 3A) the straightening shafts II, IV are shown at the smallest axial distance. The clamping cylinders 10 of the two straightening shafts II, IV are closed, as is the case in the straightening operation. The upper straightening-shaft housing 3 is indicated.

Figure 3B shows the adjustment of the straightening shaft II. The clamping cylinders 10 of the straightening shaft II are opened, and those of the straightening shaft IV are closed. The adjustment 6 cylinder 11 pushes the straightening shaft II into its new operating position. The piston end of the adjustment cylinder 11 is acted upon for this purpose. The adjustment path of the shaft II is detected by way of the remote indicator 12.

The adjustment of the straightening shaft IV is shown in Figure 3C. The clamping cylinders 10 of the straightening shaft IV are opened, and those of the straightening shaft II are closed. The annular face of the adjustment cylinder 11 is acted upon, and the said adjustment cylinder 11 pushes the straightening shaft IV into its new operating position. The adjustment path of the shaft IV is detected by way of the remote indicator 13.

Finally, Figure 3D shows the straightening shafts II and IV at the greatest axial distance. The clamping cylinders 10 of the two straightening shafts are closed (straightening operation).

The axial distance is changed from the greatest to the smallest axial distance in the reverse sequence. The functions illustrated in Fig. 3 apply to all the straightening shafts 1, 2 of the device, which in turn can have more or fewer straightening shafts 1, 2 than the nine illustrated.

7

Claims (4)

Claims:

1.

A device for straightening hot-rolled girders or sections with a variable straightening-shaft scale, wherein a horizontal adjustment of the straightening shafts is provided, characterized in that hydraulic adjustment cylinders (11) are provided for adjusting the straightening shafts (I to IX), and one respective adjustment cylinder (11) is provided for adjusting two straightening shafts (II, IV; VI, VIII) in one plane.

A device according to Claim 1, characterized in that remote indicators (12, 13) are provided for detecting the adjustment path.

A device for straightening a hot-rolled girder wherein an hydraulic cylinder is provided for adjusting the distance between two straightening shafts.

4. A device as claimed in claim 4 wherein the hydraulic cylinder is adapted to adjust the position of a selected one of the straightening shafts.

A device for straightening a hot-rolled girder substantially as described herein with reference to Figures 1 and 2.