SU940867A1 - Sieving apparatus - Google Patents

Description

The screening device comprises a frame 1, guide plates 2, which are attached to this frame with the help of hinges 3 and are made in a curvilinear form. The radius of curvature of the guide plates, their height and the distance between them are selected experimentally or by calculation, depending on the size and shape of the supplied material so that the curvilinear zone created by them ensures trapping of dangerous objects (dangling lengthy elements of linings, pieces of channel bars, fittings, broken machine parts) by seizing them in a curved space. The guide plates contain ribs 4 and are connected by a fixing bar 5, which fixes them in a predetermined position. Above these plates, a receiving hopper 6 is installed, which is designed to prevent jamming of long lengths between the loading chute 7 and the screening device. The height of the receiving bin is chosen so that the upper end of the captured object does not extend beyond its upper edge.

For operation in the automatic mode with the help of shock absorbers 8, two screening devices are installed on the common carriage 9. The trolley makes a reciprocating movement along the rails 10. For this, a series of switches is provided which, by means of an electrical control circuit, turns on the trolley drive and boot device drive in the normal condition provided by the operating mode.

Sifting device operates as follows.

The feed material from the loading device 11 through the loading chute enters the receiving 1 bunker, in which long metal objects are seized. The material is then guided to a trapping zone formed by curved guiding plates with ribs where smaller objects are trapped. Freed from dangerous items, the material is fed onto a conveyor belt 12.

When items weighing large by weight or when material is accumulated in a receiving bin due to cessation or reduction of material unloading from the device (the material unloading zone is blocked

fully or partially) the screening device is lowered onto the shock absorbers and acts on the switch. The latter, through the electric circuit, turns off the drive of the boot device and turns on the drive of the cart. Moving along the guides, the cart rolls out one screening device from under the loading chute and places another in its place.

The mounting plate is removed from the first screening device, the hinged guide plates are removed and the trapped objects are removed. When the second device takes the position of the first one, the cart turns off the limit switch located at the ends of the guides 10. The limit switch turns off the cart drive through the electrical circuit and turns on the boot drive drive. When triggered switch located. under the frame of the second device, the movement of the cart occurs in the opposite direction.

The order of switching the mechanisms on and off is repeated.

The use of the proposed device will make it possible to extract lengthy objects with different physical properties from the flow of bulk material.

Claims (3)

1. A sifting device comprising a mobile carriage with a catching device mounted on it consisting of a frame and a screening surface, characterized in that, in order to catch long objects, the screening surface is made of a set of curvilinear forms hinged to the frame of a frame with ribs. 2. A device according to claim 1, characterized in that it is provided with a receiving bin. Sources of information taken into account in the examination: the USSR 1. Author's certificate number 156498, cl. G 01 V 3/00, 1962. 2. USSR author's certificate number 189366, cl. G 01 V 3/00, 1964. 3. USSR author's certificate NS 832824, cl. B 01 B 1/40, 1979 (prototype). 12 FIG. 2