FI75236B - KONTAKTKONSTRUKTION FOER KOPPLINGSANORDNING, SPECIELLT EN VRIDFRAONSKILJARE. - Google Patents

Description

1 75236

Contact structure of a switching device, in particular a rotary isolator

The invention relates to a contact structure of a switching device, in particular of a circulating separator, comprising at least two separate contacts attached to the first part of the current path, in particular a knife contact; and a mating contact attached to the second part of the current path, which in the closed position of the switching device is located between the contacts for connecting the first and second parts of the current path 10 to each other through the contact surfaces of the contacts and the mating contacts.

In known switching devices of this type, in the event of damage to the contact surfaces of the contacts, for example as a result of clean mechanical wear or combustion due to a fault case 15, spare parts containing new contact surfaces have to be replaced in the contact structure.

It is an object of the present invention to reduce the cost of such repair and maintenance measures. This is achieved in a contact chain structure as described at the beginning, in that both the contacts and the mating contact have at least two contact surfaces, and that both the contacts and the mating contact are pivotable so that the new contact surfaces can be replaced instead of the old ones.

The basic idea according to the invention is thus to form "spare parts" built into the contact structure, in which the new contact surfaces can be easily replaced in place of the old damaged contact surfaces.

By using the contact structure 30 according to the invention, the maintenance and repair costs of the switching device are reduced, because on the one hand the reserve surfaces are easy to turn out, whereby the time required for work is shortened, and on the other hand the spare parts costs are reduced.

The invention will now be described in more detail with reference to the examples according to the accompanying drawings, in which Fig. the essential parts of the contact structure of Figure 1 seen from above.

Figure 1 shows a rotary separator to be installed in a closed position. The ends of the support insulators 1 shown in broken lines have separator arms 2a and 2b, the contact structure of which is marked with a circle A. At the end of the separator arm 2b there are knife contacts 3, and at the end of the separator arm 2a a counter contact 4. between. When the rotary separator opens, the separator arms rotate 90 ° against the paper in a perpendicular plane, whereby the contacts and the mating contact become detached from each other and the current path is interrupted. However, since the actual invention relates to the contact structure 20 itself, the structure of Figure 1 will not be explained further.

In the following, the contact structure will be explained in more detail with reference to Figs. 2 and 3. Figs. Fixed plates 6 are attached to the current path 5a of the separator arm 2b. Knife contacts 3 are fixed to the plates by means of shaft pins 6a, between which in this closed position of the separator there is a mating contact 4, There are a total of eight knife contacts 3, whereby the current path is formed through eight separate contact surface pairs. In Figure 2, these contact surfaces are marked with Silicon. The mating contact 4 is a piece of 35 silver-plated copper profile symmetrical with respect to both of its longitudinal median planes B and D. The mating contact is fixed between the fork-shaped projections 7 by bolts 8. By removing the bolts 8, the mating contact can be rotated 90 degrees about its longitudinal central axis (intersection line of planes B and D5), the contact surfaces P2 (Fig. 2) coming against the knife contacts 3.

Each of the four pairs of knife contacts is articulated with pins 9 to a lever 10, which in turn is articulated to the carriage 11 with pins 12. Attached to the carriage 11 is a rod 12, 10 projecting through an opening in the wall 13 secured between the plates 6. around the rod through the aperture projected from part of a coil spring 14 (Figure 2), one end of which is attached away from the wall 13 from the opening surface 13a and the other end of the rod 12. The spring 14 tends to pull the carriage 15 by the arrow S direction, and its potential is provided for the rod 12 of a rotatable nut 15 using. A sleeve 16 is arranged around the coil spring 14 and is locked to the end of the rod by a nut 17. Since the carriage 11 is articulated to the knives 3 as described above by means of levers 10 and pins 20 9 and 12, and because the knives 3 are spring 14, the slide 11 caused by arrow S direction of attraction of the knife contact-pressure, the three nozzles 4 against the counter contact. This is illustrated by arrows T (Figure 2). In order to prevent the knife contacts 3 25 from getting too close in the open position of the rotary separator, limiter projections 18 are formed on the carriage 11, which prevent excessive movement of the knives in the direction of the arrows T.

When the ground caused by the spring 14 is loosened from the adjusting nut 15, the carriage 11 moves towards the counter contact 4, whereby the knife contacts 3 in turn tend to open. In this case, the end surface 16a coming against the surface 13a of the wall 13 of the sleeve 16 acts as a stop, which prevents the knife contacts 3 from opening too much. As described above, the contact pressure between the knife contacts and the counter contact can be infinitely adjusted by means of the adjusting nut 15.

The knife contacts 3 are formed symmetrically with respect to both their transverse center plane E and their two longitudinal center planes F and G. When the knife-5 pig contacts 3 are rotated about one of their central axes (two central plane cut lines), new contact surfaces P3 or (Fig. 2) are obtained against the counter contact 4. By rotating the knife contacts 180 degrees about the central axis defined by the planes G and E, the new contact surfaces 10 P ^ against the counter contact 4, and by rotating the knife contacts 180 degrees about the central axis defined by the planes E and F against the counter contact 4.

By turning both the mating contact 4 and the knife contacts 3 as described above, the damaged contact surfaces P1 can be replaced by new contact surfaces P2 and P3 or P2 and P1. The contact surface shown by reference numeral P5 in Fig. 2 could also be used as a new contact surface, but in practice it is better to turn the knife contacts 3 so that either the contact surfaces or P ^ tu-20 rest against the mating contact 4.

Although the invention has been described above with reference to the examples according to the accompanying drawings, it is clear that it is not limited thereto, but can be modified in many ways within the scope of the inventive idea set forth above. Thus, for example, the invention is in no way limited to use in connection with rotary separators, but can be used in all contact-to-contact type switching devices. The shape of the knife contacts and the counter contact can also be selected in many ways, and they do not necessarily have to be symmetrical with respect to the central planes. The contacts can be in the shape of a truncated equilateral triangle, for example, with a transverse cross-section.

Claims (4)

5 7 5 2 3 6 A contact structure of a switching device, in particular a rotary separator, comprising 5. at least two separate contacts attached to the first part (5a) of the current path, in particular a knife chain (3), and - a mating contact (4) fixed to the second part (5b) of the current path , which in the closed position si-10 of the switching device is located between the contacts (3) for connecting the first and second parts of the current path to each other via the contact surfaces (P1) of the contacts and the mating contact, characterized in that both the contacts (3) and the mating contact 15 have at least two contact surfaces (P 1, P 2; P 2, P 2, P 2, P 5), and that both the contacts (3) and the mating contact (4) are pivotable so that the new contact surfaces (P 2, P 3 F, P 4, P 5) are interchangeable. replace old contact surfaces (P ^). Contact structure according to Claim 1, characterized in that the mating contact (4) is symmetrical with respect to both of its longitudinal central planes (B, D), the new contact surfaces (P2) coming against the contacts (3) by turning the mating contact (4) about its longitudinal central axis. . Contact structure according to Claim 1 or 2, characterized in that the contacts (3) are symmetrical with respect to both their transverse central plane (E) and their two longitudinal central planes (F, G), the new contact surfaces (P 1, P 4, P 2) come against the mating contact (4) by turning the contacts (3) either around their longitudinal central axis or the transverse central axis or both. Contact structure according to Claim 2, characterized in that the mating contact (4) is a profile section.