SU650126A1 - Centrifuge for depositing solid particles - Google Patents

Description

one

The invention relates to equipment for the production of electronic devices, in particular, devices for the production of phosphor screens of cathode-ray tubes (CRT).

A device for applying a phosphor to CRT screens 1 is known, in which the screen is mounted in a rotating nest with a suction cup. From the metering device, a portion of the phosphor suspension is fed to the surface of the rotating screen, which, under the action of centrifugal forces, is thrown from the center to the edges of the screen. After the suspension has spread over the entire surface of the screen, its remainder is dropped overboard when the screen is in an inverted state.

However, during the discharge of excess phosphor slurry, drips may form, resulting in poor coating uniformity.

A known centrifuge 2 for the deposition of solid particles, mainly for the deposition of phosphor particles on the screens of electron-optical instruments, comprising a rotating rotor, rotary sockets suspended along the periphery of the rotor.

During the centrifugation process, the phosphor is deposited on the screens in layers, and after the rotor stops, the liquid phase of the suspension is sucked off alternately from each nest.

The suction of the liquid above the screen is a responsible and delicate operation, since too vigorous local suction of the liquid, incomplete removal of the liquid from the screen surface or touching the phosphor coating of the suction pipe leads to screen rejection.

The purpose of the invention is to improve the uniformity of the deposited coating and increase the productivity of the centrifuge.

The goal is achieved by aligning with the rotating rotor a ring that can be moved along the axis, interacting with levers mounted in each swivel nest and having seals that cover the holes in the center of the bottom of the swiveling nests.

The drawing shows a General view of the centrifuge section.

The rotor 1 of the centrifuge is made in the form of a disk, on the periphery of which on the supports 2 the sockets 3 are suspended. The suspension axes of the 4 sockets are located above the center of gravity. Nests have sharpening to accommodate covered screens. A hole is made in the center of the bottom of the nest, which is blocked by a sealing plug 5, which is fastened to the end of the pivoting lever 6 under the influence of the spring 7. The rotor 1 is fixed to the end of the shaft 8, which rotates in the bearings 9 of the housing 10. under the action of the lever AND the sleeve 12, to which the ring 13 is attached. The rotation of the shaft 8 and the rotation of the lever II are carried out from separate drives.

The centrifuge works as follows.

In the nest 3, screens are laid below the covering, then doses of the phosphor suspension are poured into them. The rotor 1 begins to rotate.

Under the action of centrifugal forces, the nests unfold around their suspension 4, and the free surface of the suspension in the nest occupies a position close to the perpendicular axis of the nest. Centrifugal forces cause active deposition of phosphor particles on the surface of the screens.

After a predetermined time has elapsed, the rotation of the rotor is stopped, and the sockets return to their original vertical position.

The lever actuator AND is turned on, and the ring 13 moves upwards. The ring presses the levers 6 and opens the central holes of the sockets. There is a simultaneous smooth discharge of the liquid fraction of the suspension from the centrifuge nests. At the end of the drain, the screens are removed for the present.

The use of this centrifuge will reduce the waste during the deposition of the phosphor on the CRT screens and reduce the time for servicing the centrifuge by the operator.

Claims (2)

Invention Formula A centrifuge for the deposition of solid particles, mainly for the deposition of phosphor particles on the screens of electron-optical devices, contains a rotating rotor, swivel sockets dimmed around the periphery of the rotor, characterized in that, in order to improve the uniformity of the deposited coating and increase the productivity of the centrifuge, aligned with the rotating rotor. ring moveable along axes and interacting with levers installed in each swivel nest and having seals that cover the holes located in the center of the bottom of the swiveling nests. Information sources, taken into account during the examination 1. Baranovsky V. I. Technologists of the production of receiving cathode-ray tubes. M., “Energie, 1970, p. 184. 2. US patent No. 2119309, cl. 117-335, published. 1938