NL9200379A - TUBE END PROTECTION RING WITH CLAMP. - Google Patents

Description

Pipe end protection ring with clamping device.

The invention comprises a protective ring which serves to protect the pre-processed pipe ends of pipes to be welded together against damage during transport and storage. The protection ring is applied on the inside of the tube. The ring is open and the ends fit over each other. To protect the welding side, the ring is beaded outwards at an angle of approximately 140 degrees. The end of the bead is conical and rests against the end face of the tube. This construction creates a hollow space at the narrow and vulnerable welding edge. If the tube is hit on the end face, the protective ring can dent without the welding edge being hit,

The protection ring can be clamped in the tube in various ways. One end is provided with a long inwardly curved lip which, after being flattened, presses against a hook-shaped lip at the other end and tightens the protective ring into the tube. For large diameter protection rings, the protection ring may be provided at each end with a hook-shaped lip between which a zig-zag shaped spring is tensioned. A third possibility is to provide one end with transverse slits in which a lip of the other end fits and in which resilient lips are formed in the circumference of the protective ring which press against the inner wall of the tube with resilience.

It is known to protect pipe ends with an internal ring which has a flange protruding for the weld-through edge and wherein a lip welded to the ring stretches the ring by deformation.

It has been found that this type of ring offers hardly any protection. It is of the utmost importance that the welding edge, which is usually no more than one and a half millimeters wide, fits neatly against the 1 welding edge of the pipe to be welded without interruption. An interruption can cause weld drops to the inside of the pipe. When an automatic welding machine is used, it is possible that the entire weld seam will melt away in the event of an interruption and a repairable repair operation may be required. Existing protective rings often have an opening between the ring ends, so that damage can still take place.

The invention provides a protective ring which forms a hollow space at the weld-through edge, whereby damage by impact is virtually impossible. Furthermore, the invention provides overlapping ring ends so that the entire pipe end is protected. The invention furthermore comprises that various lips and hooks are formed from the material of the ring,

The invention will now be discussed with reference to the drawings,

Fig. 1 shows the pipe end with the protective ring in section.

Fig. 2 shows the view according to arrow I.

Fig. 3 shows the view according to arrow II.

Fig. 4 shows the view according to arrow I using a spring.

Fig. 5 shows the view according to arrow III.

Fig. 6 is a perspective view of the resilient lip system.

In FIG. 1, (1) indicates the pipe to be protected. Protective ring (2) is fitted in tube (1). Protective ring (2) fits with a cylindrical part (3) in tube (1). On the cylindrical part (3) there is a flange (4) which is turned outwards. The flange (4) is offset by an angle (5) beyond 90 degrees, so that the flange (4) forms an angle with the cylindrical portion (3) of approximately 145 degrees. When the protective ring (2) is pushed into the pipe, the flange <4> will rest against the machined welding side (6>. This creates a cavity <7>, the weld-through edge <8) is thus completely shielded by the bent-back flange (4). For example, if the tube <1> is hit during transport, the protective ring (2) will have to dent considerably before the welding edge <8) is hit.

To prevent pipe (1) from being damaged by an opening in the protective ring (2), the ends (9) and (10) are made overlapping. For this purpose, the end (10) is slightly bent and the flange (4) is kept wider.

In view of the often large diameters and the associated tolerances of tube (1), it is necessary to provide the protective ring (2) with a closure with which the protective ring (2) can be clamped in tube (1). In FIG. 2 and 3 a long lip (11) is punched at the end (10) which is bent towards the center of tube (1). At the lip (11) there is a bent-up part (12) that fits against hook (13) which is punched out from end (9). This hook (13) protrudes through the opening (14) from which the lip (11) is created and ensures that the two ends (9) and (10) fit. By pressing the lip (11) flat, the protective ring (2) will spread and remain firmly in tube (1),

Fig. 4 and 5 show a variant in which a zig-zag spring (15) is tensioned between hook (13) and a hook (16) which is formed at the end of opening (17) in end (10). By pressing the spring (15) more or less, the spring tension can be adjusted in steps.

Fig. 6 shows a variant in which slots (18) are punched in the end (9) in which lip (19) fits. By choosing one of the slots (18), the protection ring can be adjusted to the diameter of tube (1) and the protection ring (2) can be inserted into tube (1). Die-cut resilient lips (20) provide a clamping fastening in tube (1).

Claims (4)

11 Pipe end protection ring with clamping device for protecting pre-machined pipe ends, characterized in that the protection ring (2) is provided with a cylindrical part (3) fitting in the pipe (1) and opening towards the outer diameter of the pipe (1) to be protected bead edge which is converted between 130 and 160 degrees relative to the cylindrical part (3), with the bead having a conical part (4) that rests against the head end <6) of the tube (1) and where one end (10) of the guard ring (2) is wider and can fit snugly over the other end (9). Pipe end protection ring with clamping device for protecting pre-machined pipe ends according to claim 1, characterized in that the protection ring (2) is tensioned in the pipe (1) to be protected by flattening a curved lip (11) which is material is punched from one end (10) and which supports curved lip (11) against a hook-shaped lip (13) formed from the material of the other end (9) of the protective ring (2), Pipe end protection ring with clamping device for protecting pre-machined pipe ends according to claims 1 and 2, characterized in that the protection ring (2) is clamped in the pipe (1) by means of an "S" -shaped spring (15) which is fitted between hook-shaped lips (13), (16) in each end (9), (10) of the protective ring (2), Pipe end protection ring with clamping device for protecting pre-processed pipe ends according to claims 1, 2 and 3, characterized in that the protection ring (2) is provided with slots (16) arranged transversely at one end (9) and at the other end (10). protrusion (19) fitting in the slots (18) and in which resilient lips (20) are formed in the periphery of the protective ring (2) which press against the inner wall of the tube (1) with resilience.