SU814585A1 - Self-centring chuck with mechanized drive - Google Patents

Description

I

The invention relates to a machine tool industry and can be used for fastening from products during turning.

Known spiral-rack cartridge with mechanized drive 1.1

The disadvantages of the known cartridge are the complexity and bulkiness of the design, as well as the large loss of time during the changeover of the machine.

The purpose of the invention is to simplify the design and improve performance.

This goal is achieved by the fact that the mechanized drive is made in the form of a shock-pulse mechanism with a shunting pneumatic device built into the adapter flange and connected via a driving gear element with a bevel gear of turning the spiral disk of the spiral-end mechanism.

FIG. 1 shows the cartridge, axial section; in fig. 2 shows section A-A in FIG. one.

The cartridge has a housing 1, spiral dikes 2, which move clamping cams 3 along the radial grooves of the housing, and interconnected conical teeth mn with bevel gear 4, which has a turnkey socket.

The disk 2 has the ability to rotate from two independent drives - mechanized and manual, necessary for clamping thin-walled parts.

The mechanized drive is made in the form of a shock-pulse mechanism with a control pneumatic device, the functions of which are performed by the valve 5, the valve

0 pans The drive is built into the adapter flange 10, mounted at the end of the cartridge.

The shock-pulse mechanism contains a leading rotating element 11 with stitches 12, a rotor 13 with strikers 14 acting on the anvils 12 and at the same time contingent. At the end of the element 11, there are conical teeth coupled to the teeth of the bevel gear 4. The rotating element 11 is interconnected with the fixed re-flange 10 by means of spring-loaded plungers 15, which play the role of a friction brake.

Compressed air is supplied to the clamping device by means of an air pistol or air inlet coupling through openings. 16, 17 in the transition flange 10, to the spool 5 - through channels 18 and 19. The spool 5 and valves 6-9 control the flow of compressed air into cavities B and C, providing different rates of filling and emptying by alternately passing portions of air through throttling holes 20, 21 in the valves 7, 9. Compressed air to the cavity is supplied from spool 5 through channels 22,

23.24, 25, and to the cavity m B - from the spool 5 through channels 26-29. From the ends of spool 5, end chambers 30, 31 are located. Compressed air is supplied to chamber 30 from cavities B via command channels 32, 33 and 34, and into chamber 31 from cavities B through command channels 35, 36, 37.

5 is made channel 38.

The exhaust air exits through the channel 39. The channels 40 and 41 serve to release air from the chambers 30 and 31.

The device works as follows.

When compressed air is fed into one of the holes, for example, 16, made on the transition flange 10, the air opens valves 6, 7 and enters through the channels. 18, 22, 23

24.25 in cavity B. At this moment, the element 11 does not rotate, because the reactive moment is less than the moment of the friction brake 15. Under the action of compressed air, the rotor 13 with the strikers 14 rotates counterclockwise at an increasing speed until it strikes the strikers 14 along the anvil

12 elements 11, creating an impulse moment under the action of which element I comes into motion and turns at a certain angle, overcoming the moment of friction brake 15. Turning, element 11 with its teeth turns the conical bristle

4, a spiral disk 2, which moves the clamping cams 3. When turning the rotor

13 Counterclockwise, air from cavities B is forced out through channels 29, 28, 27, 26, 38, 39 to the atmosphere.

At the end of the first half-cycle, the strikers 14 open the command channels 32, 33, 34 through which air from the cavities B under pressure enters the end chamber 30 of the valve 5, pushing it to the left, while the valve 5 changes the direction of air flow. From the end chamber 31, air is forced out through channels 37, 36, 35 and 41 to the atmosphere.

The passage through the channels 26-29, the air enters the cavity B, causing the rotor 13 to rotate clockwise to its original position. From the cavities B, the air is forced out through the channels 25, 24, 23, 22, 39 and enters the atmosphere. Throttling the air in the hole 21 provides a slow return

rotor to its original position. At the end of the rotation of the rotor 13 clockwise, the strikers 14, striking the anvil m 12, create an impulse idle moment, which is insufficient to overcome the moment of the friction brake, as a result of which the element 111 relative to the transition flange 10 does not turn.

At the end of the second half-cycle, the jabs 14 open the command, channels 35, 36 and 37,. through which air from cavities B, under pressure, enters the end chamber 31 of spool 5, pushing it to the right to its original position. From the end chamber 30, air is forced out through channels 34, 33,

32, 40 to the atmosphere. The spool 5 changes the air flow direction. The cycle of the assembly device is repeated.

When compressed air is forced through the opening 17, the direction of rotation of the element 11 is reversed.

Claims (1)

1. USSR author's certificate No. 410879, cl. B 23 B 31/28, 1972.