RU205287U1 - Multi-position eccentric quick clamping device - Google Patents

Abstract

The utility model relates to the field of tooling for machining parts and can be used as a multi-seat quick-clamping device for fixing parts on metal-cutting machines. The device contains a housing with a cover, clamping elements located on the housing and a drive shaft mounted in the housing with the ability to rotate, on which eccentric bushings are fixed with the possibility of contacting the rods of the clamping elements and ensuring, when the drive shaft turns, the clamping elements are simultaneously moved by the amount of eccentricity for clamping the part ... In this case, Belleville springs are installed between the rods of the clamping elements and the housing cover in a pre-compressed state with the possibility of providing a predetermined clamping force of the workpiece. The use of the utility model makes it possible to increase the reliability of the device and to simplify its design. 2 ill.

Description

The utility model relates to the machining of parts, in particular to clamping devices for fixing parts on metal-cutting machines.

Known multiple eccentric clamp (USSR patent No. 438513, 1974). The device consists of a housing containing a drive shaft connected to the clamping rings by an elastic element. In order to increase the reliability of the clamp, the elastic element is made in the form of an elastic sleeve.

The disadvantage of this device is that the clamp has a complex and cumbersome design and the used elastic element that provides eccentricity is subject to accelerated wear in places of friction.

A well-known multi-seat eccentric clamping device (USSR patent No. 870060, 1981), adopted as a prototype of the claimed utility model. The device consists of a housing, which houses a drive shaft with an elastic element, which ensures the formation of eccentricity.

The disadvantage of this clamp is that the clamping force is provided by the self-locking of the elastic element, which is subject to wear over time, thereby reducing the magnitude of the clamping force.

The technical result of the proposed utility model is aimed at increasing the productivity of machining, simplifying the design and increasing accuracy due to the constancy of the clamping force.

The technical result is achieved by the fact that eccentrics are mounted on the drive shaft using keys in a multi-seat eccentric quick-clamping device, which consists of a housing with a drive shaft, providing simultaneous travel of several clamping elements by the amount of eccentricity, and Belleville springs are used to ensure the clamping force.

Eccentric bushings are attached to the drive shaft, installed in a collapsible housing, by means of a keyed connection, which ensure the simultaneous travel of several clamping elements by the amount of their eccentricity by turning the shaft with a handle through 180 °. The clamping force is provided by a set of Belleville springs in a pre-compressed state.

FIG. 1 shows the device in section; in fig. 2 shows a general view of the device:

1 - eccentric bushings

2 - keys

3 - drive shaft

4 - stock

5 - disc springs

6 - handle

7 - glass

8 - clutch

9 - nut

10 - spring

11 - work piece

12 - cover

13 - case.

The device consists of eccentric bushings 1, fastened with keys 2 on the drive shaft 3, which is located between the housing 13 and the cover 12 by means of sleeve bearing bushings. The stem 4 with Belleville springs 5 is threaded through the cover 12 and the clamp 8, fixing on it with a nut 9. The workpiece 11 and the glass 7 are placed on the cover 12, in which the clamp 8 on the spring 10 moves freely. The shaft is rotated using the handle 6 connected with it with a pin.

Eccentric clamp works as follows.

When turning the drive shaft 3 with eccentrics 1 by 180 °, the rod 4 with the nut 9 rises by the amount of eccentricity, releasing the clamp 8, which is pushed out by the spring 10, thereby releasing the part 11. The fastening is done by turning the shaft 3 in the opposite direction by the same 180 ° for the maximum lowering of the rod 4 with the nut 9, while the Belleville springs remain in a compressed state to provide the required value of the fastening force of the part.

Due to the use of Belleville springs in a pre-compressed state, a constant clamping force is provided for several parts at the same time in the fixture. The device allows you to increase the productivity of machining by increasing the speed of fixing parts.

Claims (1)

A multi-place eccentric quick-clamping device containing a housing with a cover, clamping elements located on the housing and a drive shaft installed in the housing with the possibility of rotation, on which the eccentric element is fixed with the possibility of contact interaction with the rods of the clamping elements and ensuring, when the drive shaft turns, the simultaneous movement of the clamping elements by an amount eccentricity for clamping the part, characterized in that it is equipped with Belleville springs installed between the rods of the clamping elements and the housing cover in a pre-compressed state with the possibility of providing a given clamping force of the part, while the said eccentric element is made in the form of separate eccentric bushings fixed on the drive shaft by means of dowels.

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