DE8715099U1 - Press tool for producing a press socket connection for blast furnace combustion tubes - Google Patents

Description

The invention relates to a pressing tool for producing a press socket connection for blast furnace combustion tubes.

Up to now, oil and grease-free so-called "blast furnace combustion tubes" made of ST 37 steel with threads and sockets have been used to blow oxygen into the blast furnace ladle. However, these known blast furnace combustion tubes have the disadvantage that they are relatively expensive to manufacture due to the threaded socket connection. The threads have to be cut dry, which causes wear on the pipe tool, and it is necessary to flambé the threads afterwards.

Furthermore, the pipes must have sufficient wall thickness

so that the screwed-together "lance" does not break along the thread.

The pipes are mostly screwed together in front of the blast furnace by unskilled workers, which can easily lead to improper screwing, with the threads and sockets being fitted at an angle. This results in the connection being leaky, and leaky connections increase the risk of accidents.

The disadvantages of the known socket connections described above are largely eliminated by the press socket connection. In addition, this connection results in low manufacturing costs for the material used.

The present invention is based on the object of creating a pressing tool for producing a press sleeve connection for blast furnace combustion tubes, with which the press sleeve connection can be produced in a significantly simpler and lower cost manner. The pressing tool according to the invention consists of two symmetrical pressing jaws, each of which has a semicircular recess such that a cylindrical cavity is created when the pressing jaws are pressed together, the pressing tool being characterized in that the inner diameter of the cylindrical cavity corresponds to the outer diameter of the press sleeves and on the inner wall of the recess of each pressing jaw, in a plane running perpendicular to the axis of the cavity, four groove-like projections with a conical cross section and an inward-facing tip are arranged at a distance from one another.

According to a particular embodiment, the projections on the base have a width of 1.9 mm and run conically towards the tip, the height of the projections being approx. 1.2 mm

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The pressing tool according to the invention achieves the significant advantage that the press sleeve, as a precision sleeve that is precisely matched to the outside diameter of the pipe, can first be pushed onto the middle of a pipe end and placed in the pressing tool. A connection is then made with the pipe under pressure of 600 bar. A second pipe is then inserted into the ( ) connection and again connected to the first pipe under a pressure of approx. 600 bar. The significant advantage is that the time required is relatively short and is approx. 45 seconds to 1 minute to make the connection.

The precision tool according to the invention will be explained in more detail using the example of a preferred embodiment with reference to the drawing.

The drawing shows

Fig. 1 Two expanded pressing jaws of the pressing tool in side view.

Fig. 2 shows a section through the pressing jaws according to Fig. 1.

Fig. 3 shows an enlarged partial sectional view according to Fig. 2.

As can be seen from the figures in the drawing, the pressing tool consists of two symmetrical pressing jaws 1, 2, each of which has semicircular recesses 3, 4, which enclose a cylindrical cavity when the two pressing jaws are brought together. The inner diameter

-fides of the cylindrical cavity corresponds to the external diameterf of the press sleeve which connects the two pipes. On the surfaces of the press jaws _{1 1} 2 opposite the recesses 3, 4, known fastening devices 5* 6 for the press are provided.

Four projections 7 are provided on the inner wall of the respective recesses 3, 4 of each press jaw 1, 2, which are arranged on the inner wall in a plane running perpendicular to the axis of the cavity.

Projections have a conical cross-section _{with a} tip directed inwards*

In the example shown, two projections 7 are arranged at smaller distances from each other, while the two pairs of projections are spaced further apart. The width B at the base of each projection 7 is approximately 1.9 mm. The height H of the projections is approximately 1.2 mm for 1/4" and 3/8" pipes.

The dimensions are of course based on the size of the diameters of the sockets and pipes and must

) can be enlarged or reduced accordingly for larger or smaller diameters.

Claims (2)

. Press tool for producing a press sleeve connection for blast furnace combustion tubes, consisting of two symmetrical press jaws, each of which has a semicircular recess such that when the press jaws are pressed together a cylindrical cavity is created, characterized in that the inner diameter of the cylindrical cavity corresponds to the outer diameter of the press sleeves and on the inner wall of the recess (3, 4) of each press jaw (1, 2) in a plane running perpendicular to the axis of the cavity four groove-like projections (7) with a conical cross-section and an inwardly directed tip are arranged at a distance from one another, 2. Press tool according to claim 1, characterized in that the projection (7) with the tip pointing inwards on the base has a ti * &igr; it ti * Ml * »■■ti · ■ ····■ Width (B) of 1.9 mm and height (H) of 1.2 mm.