SU1242325A1 - Actuator of clamping device - Google Patents

Description

one

The invention relates to the processing of materials by cutting, namely, devices for securing parts to machine tools equipped with a hydraulic actuator.

The purpose of the invention is to increase the reliability of securing parts at high clamping forces by making the piston-locking mechanism of the hydraulic drive in the form of a collet with an additional piston.

The drawing shows the clamping device, a longitudinal section.

The clamping device drive is made in the form of a strong cylinder 1 with cylindrical undercuts A and B in which piston 2 with rod 3 is placed. In the power cylinder 1, there is also a hole in the conical B and cylindrical D parts, and in the piston 2 a hole In which the rod 4 with the conic working part 5 of the additional piston 6 is placed. On the piston 2 there is fixed a multilobe collet 7 with conical outer D and inner E surfaces. A multi-petal collet 7 with an additional piston 6 forms a mechanism for fixing the position of the piston .2. In the stem 3 threaded bore 8. The cavity 9 of the power

423252

cylinder I is connected by channel 10 to cavity 11 of stem 4.

Cavity 12 cylinder 1 compound atmosphere. The working fluid is fed into the cavity 13 during the backpressure.

The drive works as follows. When feeding the working fluid into the cavity 9, from which it flows non-;

 O cut the channel 10 into the cavity 11, the arm 2 moves downwards, moving the working element of the clamping device (not shown) screwed into the thread. When the piston 2 stops, the conic part 5

The tS continues to move downward under the action of pressure on the rod 4 in the cavity 11, which a certain distance of the Leia fixes the piston 2, for a reliable fixation of the piston 2, the angle of inclination

20 of the conical part 5 is selected less than the angle of self-braking. When the pressure in the cavities 9 and 11 drops, the force transmitted by the piston 2 through the rod part by means of threads retains 25 due to the fixing of the collet 7, the cylinder 1 is uncressed by applying pressure to the cavity 13. cavities 1I and jointly pistons 2 and 6

30 return to the starting position.

Editor N. Tupitsa

Compiled by A.Nikiforov

Tehred L.Oleynik Proofreader O.Lugov

Order 3651/17 Circulation 826 Subscription

BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

(.57) CLAMP DEVICE ACTUATOR comprising a power cylinder, a main piston with a rod and a piston fixing mechanism, characterized in that, in order to increase the reliability of securing parts with high clamping forces, the piston fixing mechanism is made in the form of a collet fixed to the piston with conical outer and inner surfaces, an additional piston with a rod and a conical working part, while in the main piston a hole is made to accommodate the rod of the additional piston, and in the power cylinder there is a hole with conical and. cylindrical surfaces, in which the collet and the additional piston are respectively placed, · the collet is installed with the possibility of interaction of the conical outer surface with the conical surface of the opening of the power cylinder, and the conical inner surface with the working part of the rod of the additional piston.