CH646812A5 - REMOTE-CONTROLLED SCISSORS FOR THE CUTTING-UP OF IRONED FUEL RODS OR BUNCHES. - Google Patents

Description

The invention relates to a remote-controlled scissors according to the preamble of claim 1.

From DE-OS 21 61 534 a device is known in which nuclear fuel bundles are gradually fed via a magazine to a hydraulically operated pressing and cutting device. As a result of the pressing and cutting, the bundle breaks down into individual rod-shaped sections, which reach a further treatment device via a pipe socket connected to the device. In DE-OS 18 15 867, in particular Fig. 9 with associated text, a similar device is shown, with which individual bars or tubes can also be cut into short sections.

With these devices, maintenance, in particular when replacing the wearing parts, with regard to the remote control, complications and time delays can occur, since both maintenance-free and maintenance-requiring components have to be dismantled or re-adjusted and assembled in a manner that is functional. The resulting downtimes can significantly affect the overall performance of such scissors.

The invention has for its object to design a. Remotely operated scissors according to the preamble of claim 1 so that the manipulations required for remote maintenance, in particular for the replacement of the knife set and the drive device, are considerably simplified, thereby reducing downtimes .

To solve this problem, the measures contained in the characterizing part of claim 1 are proposed; the claims related to this contain advantageous refinements and developments of this solution.

With the invention are disclosed with a minimum of manipulations, namely only lifting the scissor block parts from each other, knife set and drive device. They can then be freely removed from their storage locations and replaced with new parts without the need for special adjustment work or the loosening and assembly of connecting elements, which are particularly difficult and time-consuming to do remotely.

With the measure according to claim 2 it is achieved above all that the drive device no longer needs to be mechanically connected to the shear blade, which also contributes to making it easier to replace the parts. At the same time, this effectively prevents the ram from tearing off or the shear knife from seizing and increases the cutting performance, since each stroke is a working stroke.

According to claim 3, the scissor block consists of only two solid parts, so that it is sufficient to lift off the upper part in order to access the wearing parts.

According to claim 4, the shear knife thickness determines the length of the sections to be cut, since the bars or bundles of bars can be inserted into the feed device until they strike the bottom plate of the knife guide part of the knife bushing. After each stroke, the sections fall through the drop opening in the knife guide part and a subsequent opening in the scissor block.

An embodiment of the invention is explained below with reference to the drawing.

The figure shows the scissors schematically in a sectional drawing. The scissor block consists of a lower part 1 and an upper part 2, the parting line 3 (dashed line) between these parts being stepped. The steps are designed so that the two parts are locked against each other in the horizontal direction, whereas the upper part 2 can be freely lifted from the lower part 1 in the vertical direction. In a recess 4 of the lower part 1, a knife attachment is embedded, consisting of a knife bushing 5, 6 and a shearing knife 7 that slides in the horizontal direction. Further recesses 8, 9, 10 in the parts 1, 2 serve to accommodate two with holding flanges, hydraulically driven lifting devices 11, 12 and a feed device 13 for the rods or rod bundles to be cut. The piston tappets 14, 15 point towards one another and their ends lie against the free end faces 16, 17 of the shear knife 7. The feed device 13 has tubes 18, 19 with funnel-shaped lugs through which the rods can be fed to the knife set 5, 6, 7. The knife bushing consists of a knife guide part 5 with a U-shaped cross section and a knife plate 6 fastened thereon. The knife plate 6 has cutting openings 20, 21 which are aligned with the tubes 18, 19 and whose cross section is matched to that of the rods to be cut , while the shear knife 7 has an opening 22, the cross section of which is larger than that of the rods. Both the edges of the openings

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20, 21 and the edges of the through hole 22 are designed as cutting edges.

As can also be seen from the figure, the base plate of the knife guide part 5 has a drop opening 23 which is axially offset from the cutting openings 20, 21, 5 so that the base plate lying directly on the cutter 7 simultaneously forms a stop for the rods . A further opening 24 in the lower part 1 of the scissor block connects to the drop opening 23.

The rods to be cut are fed to the tubes 18, 19 10 and arrive step by step - with a vertical feed e.g. due to their own weight - through the cutting openings 20, 21 and then with a corresponding knife position through the opening 22 to the stop surface of the bottom plate of the knife guide part 5. Since the knife 15 plate 6 also bears against the shear knife 7, the thickness of the shear knife determines the length of the rod sections to be cut. If the lifting device 11 is now acted upon by a pressure medium 25, the shear knife 7 shifts from left to right, shearing off a section of a supplied rod, conveying it to the outlet opening 23 and subsequently picking up a rod section from the tube 19. In a corresponding manner, the return stroke takes place by applying a pressure medium 26 into the lifting device 12, so that no idle stroke occurs.

For maintenance, the upper part 2 of the scissor block is lifted from the lower part 1, so that the lifting devices 11, 12 and the knife set 5, 6, 7 are freely accessible and can be removed directly from their storage locations without loosening additional connecting elements and replaced with new components can.

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1 sheet of drawings

Claims (4)

646 812 1. Remote-controlled scissors for cutting section-wise irradiated nuclear fuel rods or bundles of rods, with a) a shear knife movable transversely to the rod or bundle axis, b) a knife bushing in which the shear knife is slidably mounted, c) a feed device for the rods or rod bundles, the receiving bores of which are adapted to the rod or rod bundle shape and are aligned with cutting openings in the knife bushing, d) a discharge opening for the sections opposite the cutting openings, and e) a drive device for actuating the shear knife ", characterized by the following features: A) a solid, divisible scissors block (1,2) with recesses (8,9, 10) in which the knife bushing (5, 6), the drive device (11,12) and the feed device (13) are positively and immovably embedded , B) the scissors block consists of parts (1, 2) which are detachably and positively locked against one another. 2. Remote-controlled scissors according to claim 1, characterized in that the drive device consists of at least two hydraulically driven lifting devices (11, 12), the piston tappet (14, 15) on the two free end faces (16, 17) of the shear knife (7) attack, and that the shear knife (7) has at least one opening (22), the cross section of which is larger than that of the rod or rod bundle to be cut and the edge or edges of which are formed as cutting edges. 2nd PATENT CLAIMS 3. Remote-controlled scissors according to claim 2, characterized in that the scissor block consists of two parts (1, 2), the parting line (3) between these parts being stepped. 4. Remote-controlled scissors according to one of claims 1 to 3, characterized in that the knife bushing consists of a fixed knife plate (6) with the cutting openings (20, 21) and a cross-sectionally U-shaped knife guide part (5), the as Stop for the rods or rod bundle serving base plate on the shear knife (7) and has one or more outlet openings (23) which are axially offset from the cutting openings (20,21).