RU2291047C2 - Shears for cutting sheet - Google Patents

Abstract

FIELD: metal working.

SUBSTANCE: shears comprise bed frame, unmovable top knife beam, bottom knife beam mounted for permitting movement in the guide of the bed frame actuated by the hydraulic cylinders, and mechanism for stabilizing position of the movable knife beam made of a shaft mounted on the bed and provided with levers pivotally connected with the movable knife beam through chuckles.

EFFECT: simplified structure.

1 dwg

Description

The invention relates to the field of metal forming, and more particularly to a lower cut guillotine shears designed for cutting sheet metal.

Known guillotine shears for cutting steel (Korolev A.A. Mechanical equipment of ferrous and non-ferrous metallurgy workshops, M .: Metallurgy, 1976; pp. 249-250, fig. VIII.9.) Containing a bed, a fixed knife beam and a movable knife beam installed with the possibility of movement in the guides of the bed and connected with the eccentric shaft of the drive.

The disadvantage of these scissors is the complexity of the design and the large dimensions of the drive.

Known guillotine shears (USSR Author's Certificate No. 540705, MKI7 B 23 D 15/06) containing a bed, a fixed upper knife beam, a lower movable knife beam installed in the guide rails of the frame and connected with the rod of the power cylinder. The hydraulic drive has a simple design, provides high performance, however, a complex system is needed to stabilize the position of the movable knife beam, since it is necessary to eliminate distortions that occur during cutting as a result of the gradual introduction of the tilted knife into the metal and the movement of the resultant cutting forces along the cutting line.

Known guillotine scissors (USSR Author's Certificate No. 925561, MKI7 B 23 D 15/06), the design of which is adopted as a prototype, containing a bed, a fixed upper knife beam, a lower movable knife beam installed in the guide frame and connected with the rod of the power cylinder, as well as two gear racks mounted on a movable knife beam on both sides along the cut line and equipped with a mechanism for moving the rails made in the form of two gears connected by a common shaft to ensure stabilization of the position of the movable th knife beam.

The disadvantage of this design is the difficulty of adjusting the gaps in the gearing, which can change during operation due to wear of the shear elements, which will lead to jamming. In addition, the design has large dimensions and weight.

The problem solved by the invention is to simplify the design and operation of scissors.

This problem is solved as follows.

In the known guillotine shears for cutting sheet metal, containing the bed a fixed upper knife beam, a lower movable knife beam mounted to move in the guides of the frame from the hydraulic cylinder, and also a mechanism for stabilizing the position of the movable knife beam, according to the invention, the latter is made in the form of a shaft mounted on the bed with levers pivotally connected by means of earrings with a movable knife beam.

The drawing shows a General view of the proposed guillotine shears.

Guillotine shears for cutting sheet metal consist of a bed 1, a fixed knife beam 2 with an inclined knife 3 rigidly fixed on it, a movable knife beam 4 with a straight knife 5 mounted in the guides 6 of the bed 1 with the ability to move from a pair of hydraulic cylinders 7, 8. On frame 1 under the beam 4 symmetrically relative to the axis of cutting in the supports 9 mounted shaft 10 with levers 11 pivotally connected by means of earrings 12 with a movable beam 4.

Guillotine shears work as follows.

The sheet is set into the gap between the knives 3, 5, after which the hydraulic cylinders 7, 8 are turned on. The movable beam 4 with the knife 5 begins to move along the guides 6 in the direction of the fixed knife beam 2 with the knife 3, which, gradually introducing into the sheet, cuts it .

The resultant cutting force, which changes its position relative to the axis of symmetry of the scissors, is perceived by the bearings 9 of the shaft 10, which rotates when lifting the beam 4 and prevents distortions of the movable beam 4 in a plane perpendicular to the direction of metal supply.

Claims (1)

Guillotine shears for cutting sheet metal, containing a bed, a fixed upper knife beam, a lower movable knife beam installed with the possibility of movement in the guides of the bed from the hydraulic cylinders, and also a mechanism for stabilizing the position of the movable knife beam, characterized in that the mechanism for stabilizing the position of the movable knife beam is made in the form of a shaft mounted on a bed with levers pivotally connected by means of earrings with a movable knife beam.