SU722618A1 - Apparatus for actuating the rod of feed mechanism of pilgrim-step rolling mill - Google Patents

Description

one

The invention relates to pipe production and can be used when rolling pipes on pilger mills, especially in feeding devices.

A device for moving the feeder shaft of the pilger mill is known, comprising a piston connected to the rod, an air feed chamber connected to the control spool, and a mechanism for rotating the rod 1.

The disadvantage of this device is the instability of its operation at high rolling speeds. Air supplying higher pressure to the air cylinder at the time of acceleration of moving parts and its discharge at the time of deceleration and rollback are performed synchronously with the work rolls of the working stand using the control spool, which is unstable in connection with the switching frequency of 12000 per hour its inertia and inconsistency in the magnitude of the switching force.

The closest to the technical essence of the invention is a device for moving the stem of the feeding apparatus, comprising a piston connected to the rod, an air chamber, a mechanism for the accelerated movement of the rod, made in the form of an additional air chamber with the piston, and a mechanism for rotating the rod 2. The disadvantage of this device is that during the rollback of the workpiece (in the process of its deformation) it needs to overcome two forces (the force created by the air chamber and the force created by the auxiliary air chamber measure) that increases the strength of the total pressure on the piston of the air chamber not only in .moment acceleration but also during the recoil, and hence it is possible Slippage (vanie between the rolls and the billet in the rolling process, which leads to deterioration of the surface quality of the tubes.

To reduce the axial force on the rod of the feeding device in the process of rolling back the workpiece and thereby improving the quality of the outer surface of the rolled tubes, in the proposed device comprising a piston connected to the rod, an air chamber, mechanisms for the accelerated movement and rotation of the rod, the mechanism for the accelerated movement of the rod is in the form of a gear rail, clutching the rod and fixed from axial displacement relative to him, and driven from the electric motor through the electromagnetic clutch gear.

These distinctive features ensure the application of a power pulse to the moving parts of the device and the rolled billet at the time of their acceleration and exclude the action of the power pulse during braking and haulage, which increases the speed of the device without degrading the quality of the rolled tubes.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 given a view of the device from above.

A device for stirring the stem of the feed, its apparatus contains an air chamber 1, a piston 2 mixed in it, connected by a double-sided rod 3, a rod turning mechanism 4 and a rod moving mechanism 5 in the form of a toothed rack and a split gear in contact with it wheel 6, which is driven from the electric motor 7 through an electromagnetic clutch 8 with a flywheel 9. The air chamber is mounted on the carriage 10 movable from the drive (not shown) carriage moved along the bed rail 11. Air supply into the air chamber through a supply port 12, which is located in the middle of the chamber body. At the end of the stem 3, a retainer 13 is secured with a mandrel 14. The stem is loosely grasped by the rail 5, which is fixed against axial displacement relative to the stem.

The operation of the work rolls 15 and the electromagnetic clutch 8 is synchronized by a contactless sensor 16 connected to the work rolls.

The device works as follows.

After the billet is gripped by 17 rollers 15 of the working stand 18, the billet is rolled along the mandrel 14, while the mandrel with the billet rolls is rolled back from the working stand. Compressed air located on the right side of the air chamber helps to roll back. Compressed air improves the gripping conditions and reduces the workpiece slippage in rolls. In the process of rolling and rolling back the workpiece, the air pressure in this part of the chamber drops to the inlet, and after the piston passes the opening 12, the pressure in the first part of the air chamber

increases, absorbing inertia recoil. At the moment of gripping the workpiece with rollers, the sensor 16 connected to the rollers of the working stand, With the necessary advance, gives an impulse to disengage the coupling 8, the gear wheel 6, which rotates freely, does not prevent rollback. At the time of opening of the working roll gauge, the sensor 16 with the necessary advance generates a pulse on the coupling 6 and the rod 3 under the influence of air compressed in the left cavity of the chamber 1 of the gear wheel 6 connected to the rack 5, moves forward, feeding the workpiece 17 into the mouth work roll gauge. After the piston 2 of the air chamber passes through the supply port 12, the pressure in the right-hand part of the chamber increases, absorbing the inertia of supply. Rod with mandrel and billet brakes. At the end of the feed, the sensor gives an impulse to, disengaging the electromagnetic clutch. The billet is seized by the rollers and the cycle repeats.

0 The proposed device improves the quality of pipes and the stability of operation by facilitating the rollback of moving parts. and at the same time improve the speed and, consequently, the performance of the pilgrim plant.

Claims (2)

1. USSR author's certificate number 529859, cl. B 21 B 21/04, 1974. 2.Sb. articles URALNITI. “Metallurgists, 1968, issue 9, p. 130-133.