CS213469B1 - Compression stool for tube bends - Google Patents

Abstract

The invention can be used in the production of tubular arches by mandrel forming. The invention solves the problem of inserting a drawbar with a welded mandrel into the fixed stands of a pusher. The essence of the invention lies in the fact that the fixed stands of a pusher are made of a horseshoe-shaped stand body, which is equipped with two jaws with hydraulic cylinders. The horseshoe-shaped shape of the stand body creates an open insertion space. The attached drawings characterize the invention in the following way. 1.

Description

The invention can be used in the manufacture of tubular arcs by mandreling.

The invention solves the insertion of a draw bar with a welded mandrel at the fixed stands of the press stand.

The essence of the invention is that the fixed stands of the press stand are formed from a horseshoe-shaped stand body provided with two jaws with hydraulic cylinders. The horseshoe shape of the stand body creates an open insertion space.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in the accompanying drawings. 1.

cn

213169

213 469

The invention solves a press stand for the production of pipe bends.

The known and previously used devices are formed from their own frame, two fixed stands through which a draw bar with a welded mandrel and piston rods of hydraulic cylinders pass, as well as hydraulic cylinders, a push head, support rollers and a draw bar with a welded mandrel. In order to be able to slip the welded rod into the fixed racks, it is divided in the middle and part of the welded rod is slid over the guide rollers through an opening in the first fixed rack. The second part of the draw bar is slid into the second fixed stand from the side of the split tube conveyor. This is followed by a firm connection of the two parts of the tow bar between the two fixed stands. The above-mentioned description shows the time consuming insertion of the tow bar into the fixed stands and the support rollers. The insertion of two parts of the drawbar places considerable demands on space in front of and behind the press stand. On the side of the pipe conveyor there is a free space, but on the side of the support rollers there is a furnace for preheating and mandreling the pipe bends. The furnace must therefore be mobile with a large travel distance from the press stand equal to the length of the pull rod portion with the mandrel fed and the length of the furnace itself.

These disadvantages are overcome by the invention of the press stand according to the invention, wherein the fixed stands of the press stand are formed from a horseshoe-shaped stand body provided with two jaws with hydraulic cylinders. The horseshoe shape of the stand body creates an open insertion space. Straight jaw faces when clamped fit into the transverse recesses of the drawbar.

The greater effect of the invention can be seen in the ease of inserting and removing the draw bar with a welded mandrel and great savings in working space and investment costs for furnace travel. A further advantage is that the tow bar is split, so that subsequent rigid joining is eliminated.

In the accompanying drawings, FIG. 1 schematically shows a press stand and FIG. 2 shows an embodiment of a fixed stand.

The press stand consists of the frame itself, the fixed stands 2,2a, the push heads 3, the draw bars 4 with the welded mandrel 14 provided with transverse recesses 5, the support rollers 6, the feed device 12 of the tubes 13. The fixed stand 2 is formed by the body 7 The horseshoe shape of the body of the stand 7 creates an open loading space 11 for the draw bar 4 with transverse recesses 5.

Upon release of the jaws 8 of the rigid supports 2.2a, the draw bar 4 with the welded mandrel 14 is inserted into the open loading space 11 of the rigid supports 2.2a and abuts the prismatic support roller 6. The feed tubes 12 slide the split tubes 13 onto the draw bar 4. of the tubes 13 in front of the push head 2 ^e , the jaws 8 of the fixed stand 2 and the push head 2 push the tubes 13 to the unrefined burners and the mandrel 14 ♦ When replacing the draw bar 4 with the welded mandrel 14. the rod 4 with the welded mandrel 14 is removed from the press stand by the open loading space 11.

The greater effect of the invention can be seen in the ease of inserting and removing the draw bar with a welded mandrel and great savings in working space and investment costs for furnace travel. Another advantage is that the drawbar is not split, so that subsequent rigid joining is eliminated.

The invention can be used in the manufacture of pipe bends by mandreling.

Claims (2)

SUBJECT OF THE INVENTION Pipe bends for the production of tubular arches consisting of a frame, fixed stands, push head, draw bar with welded mandrel, support pulley, feed device and accessories, characterized in that the fixed stands (2,2a) are formed from a stand body (7) of a horseshoe-shaped shape, which is provided with two jaws (8) with hydraulic cylinders (10), which creates a horseshoe-shaped body «and« of a toanane (7) to form an open insertion space (11). 2. The press stand as claimed in claim 1, characterized in that the faces (9) of the jaws (8), when clamped, engage the transverse recesses (5) of the draw bar (4).