DE3031778A1 - Self-aligning tube clamping - has swivelling jaws on two power cylinder-operated two-armed levers pivoting on slidable cross beam - Google Patents

Abstract

The clamp for the ends of tubes which are not straight has two jaws (1,2) gripping the tube end (10). The other ends of the jaws are connected to one pair of the ends of the two-armed levers (3,4) with their other ends pivotally connected to the piston rod ends of double acting power cylinder (6). The centres of the two armed levers pivot on the two ends of a cross beam (5), suspended from a support (9) via springs (7,8) so that the cross beam can slide horizontally in either direction. This provides self-alignment of out-of-centre tube ends.

Description

The invention relates to a device for tensioning

of pipes When processing pipe ends, it is well known that the pipes are firmly clamped.

This is the case, for example, when welding sleeves or the like by friction welding etc. required both to center the pipe and to fix it clamp in order to be able to apply the necessary frictional pressure.

In the case of straight pipes, there is a normal known pipe clamping device sufficient.

In the case of pipes that are curved differently from the center of the axis, however, the tube forcibly pressed into the center of the axis using the usual clamping device. To Loosening the clamping device, the pipe returns to its original position, i.e. the @working pipe ends show an angular misalignment that is no longer within the tolerance on.

The object of the invention is to create a pipe clamping device, with which, if there is a deviation in the center of the axis of the pipe to be clamped, the necessary Force for clamping is applied without the pipe in its given axial position change.

According to the invention, the output is solved by the in the identifier of the Claim 1 specified features.

<4ne embodiment results from claim 2.

With the device according to the invention can be pipes that Deviate from the center of the axis, clamp it without exerting a forced displacement on the pipe.

When machining a pipe end, there is now no angular deviation during the clamping process still when loosening it, so that e.g. when welding Sockets or the like, the pipe end position determined by the centering device are retained and the welding can be done in the axial direction.

In the accompanying drawings, one possible embodiment is a Pipe clamping device according to the invention shown schematically.

The figures show: FIG. 1 the basic structure of the device, FIG 2 the normal position of the device with a tube lying in the center of the axis, FIG 3 the device in the normal position shown in Figure 2 with one in the Clamping plane eccentric tube, Figure 4 Figure 3 in the clamped state, Figure 5 a further possibility of tensioning with the position of the pipe according to FIG. 3.

In FIG. 1, a tube 10 and the entire device are in the normal position shown the tensioning. The jaws 1 and 2 are rotatable on the upper Ends of the tension levers 3 and 4 attached. At the lower ends of the clamping levers 3 and 4 is a double-acting clamping cylinder 6 also rotatably angeordn.et between Clamping jaws 1 and 2 and clamping cylinder 6, a clamping lever crosshead 5 is arranged.

The tensioning lever crosshead 5 is horizontally movably mounted and also rotatably connected to the clamping levers 3 and 4. Inside the tension lever crosshead 5 are adjustable elements, e.g.

Compression springs 7 and 8 built in. The tension lever crosshead 5 is through a link guide 9 fixedly arranged outside the device in the horizontal plane held.

When using the clamping device according to the invention and off-center For pipes to be clamped, as shown in Figure 3, the clamping jaw 1 is attached to the Wet "r" moved Rchr 10 to the system. In order to clamp the pipe 10 without changing its position, If the clamping jaw 2, as Figure 4 shows, over the horizontal shifting of the clamping lever crosshead 5 and clamping lever 'brought up to the pipe 10. The clamping jaws are now supported 1 and 2 on the pipe 10 and the clamping process takes place without changing the position of the Pipe.

In FIG. 5, the same process as in FIG. 4 is shown. However, different friction conditions are assumed in the clamping cylinder 6, so that the clamping jaw 2 is only brought up by the piston movement of the clamping cylinder 6 takes place.

A solution is also conceivable in which the position-matching function of the clamping lever cross-head by ei = e rotatable around a point arrangement of the total device is replaced.

L e r s e i t e

Claims (2)

Device for clamping pipes Claims: 1 device for Clamping of pipes by means of two radially engaging clamping jaws, characterized in that that the clamping jaws (1,2) are hinged to the upper ends of two clamping levers (3,4) are the lower ends of a rotatable, hinged, double-acting Clamping cylinder (6) are connected and that the clamping lever (3, 4) between the articulation points the clamping jaws (1,2) and the clamping cylinder (6) via a horizontal one on these articulated Tensioning lever crosshead (5) are connected, which by a fixed link guide (9) held outside the device argeord designated is. 2. Apparatus according to claim 1, characterized in that the clamping lever crosshead (5) has adjustable spring elements (7,8).