Electric grater. Drawing, description

TOOLS AND MECHANISMS FOR AGRICULTURE
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Electric grater. Drawing, description

Tools and mechanisms for agriculture

Directory / Tools and mechanisms for agriculture

Grinding even a dozen carrots on a manual grater is a laborious task, but if you need to prepare pet food, process a lot of vegetables and fruits? I got out of the situation with a simple electric grater. I used an electric motor with a power of about 200 W, with a nominal shaft speed of 1400 rpm. (A motor from a household electric grinder is quite suitable; you can also use a three-phase asynchronous one, with a capacitor circuit for connecting to a single-phase network.)

The working body of the grater is a round steel disc with a thickness of 1,5 and an outer Ø300 mm. The cutting edges in the disc are formed by extruding the edges of holes Ø8 mm drilled in the disc in mutually perpendicular directions. Each row contains 5 holes spaced 16 mm apart, and offset in the radial direction with respect to the adjacent row by 1/2 interval. Thus, two groups of cutting edges are obtained, completely covering the working area with a width of 80 mm. To obtain a different degree of grinding, a disc with holes of a different diameter will be required. The rigidity of the disk in the axial direction is reinforced by double rolling of the edge, and from the back side - by the radial installation of four steel or duralumin corners.

It is more convenient to fix the disk on the motor shaft on the landing sleeve. Four short bolts are screwed into its flange from the inside, on the cylindrical shanks of which, like pins, a grating disk is mounted. The sleeve is fixed on the shaft with a radial bolt, the shank entering the keyway, and the axial bolt through the pressure washer. The direction of rotation of the motor shaft is counterclockwise.

Rice. 1. Electric grater (click to enlarge): 1 - loading wedge, 2 - hopper, 3 - front side of the casing, 4 - connecting strip of the casing, 5 - grater disk, 6 - bearing sidewall of the casing, 7 - electric motor, 8 - table, 9 - cutter

Rice. 2. Fastening the disk on the motor shaft (click to enlarge): 1 - bunker, 2 - loading wedge, 3 - sidewall, 4 - casing, 5 - bearing sidewall of the casing, 6 - motor flange, 7 - stiffening angle, 8 - grater disk , 9 - disc mounting bolt (4 pcs.), 10 - radial bolt fixing the bushing, 11 - axial bolt, 12 - motor shaft, 13 - disc washer, 14 - bushing

Rice. 3. Placement of cutting holes and stiffeners on the disk (view from the back side) (click to enlarge)

The casing of the grater consists of two plywood plates 10 mm thick, a hole for the shaft is cut in one of them, and a loading window in the second. The latter goes into a bunker, bent from a metal sheet, and equipped with a wooden wedge - for the safe supply of root crops to a rotating disk. The sides of the casing are connected along the perimeter with a metal strip so that an exit window is formed from below.

It is best to mount the casing directly on the engine housing, but if it does not have a mounting flange, then the bearing sidewall should be firmly fixed on the horizontal engine support - a small stable table. On his working board it is useful to attach a cutter for preliminary grinding of fruits.

Author: A.Reznik

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