SU1079324A1 - Apparatus for holding mandrel of tube continuous rolling mill - Google Patents

Abstract

TOOL FOR RETENTION OF THE GRIP OF THE MILL OF CONTINUOUS ROLLING OF PIPES, containing a drive carriage, hydraulic cylinder located on it, mandrel grippers and the mechanism of their movement, characterized in that, in order to increase the reliability of the device and increase its speed, it is equipped with plunger cylinders and a cavity, and a cavity card, and a cavity card, and a cavity card, and a cavity, and a hinge body, with a hinged device, which has a hinged cylinder; connected to the hydraulic cylinder through check valves and through a safety valve to the fluid reservoir mounted on the carriage and connected to the rod end of the hydraulic cylinder, and the mechanism zahvate® displacements reference is made in the form of a helical transmission with gear teeth at the free ends of the gripper plungers and plunger cylinders, the axes of which are perpendicular to seizures. V.1; on with to 4:

Description

The invention of ognevigs for pipe production, namely, devices for quick-release connections of the mandrel of a continuous mill with its holding mechanism, can be used in pipe-rolling units with a continuous mill during rolling of free-tube pipes.

A known mechanism for holding a reference rod, which includes a drive carriage with a diametrically ram. hydraulic cylinders, a sensor rigidly connected at one end to a mandrel fixed to the rod, and a rigid split hydraulic feedback assembly. The mechanism is also provided with a flange bushing mounted in the carriage with possible & axial displacement and coaxial to the rod and a hinged lock for the rod fixed to the flange of the bushing l.

However, such a mechanism for holding an arbor rod does not provide speed and reliability in operation, has low productivity, is complex in design due to the presence of a large number of its constituent elements, which are not necessary for the operation of electrohydraulic synchronous drives with a tracking system. In addition, such a mechanism cannot be used for the process of continuous rolling of tubes with retention of the mandrel.

A known mechanism for holding an arbor rod, which includes a hydraulic cylinder, in the rod of which the end of the rod is attached, grips the rod and the hydraulic cylinder piston displacement control system associated with them. The mechanism is equipped with a spaced spacer and a spacer sleeve that are fixed on the rod between the mandrel and the hooks fixedly 2.

The disadvantage of this retention mechanism of an arbor rod is that it takes a considerable amount of time to set up and operate the mechanism, which also requires additional energy and highly skilled care during operation.

The closest in technical essence is a device, with a driving carriage that is clamping, a hydraulic cylinder located on it, mandrel grippers and a mechanism for their movement.

A disadvantage of the prior art design for holding the mandrel of a continuous tube rolling mill is that to release the mandrel

manual gripping is required from the grippers, and for reliable operation of the device as a whole, it is necessary to prepare the drying of compressed air, a hydraulic station with an electric appliance. In addition, the device is complicated in design, has a large number of constituent elements, which leads to a delay in operation, and, consequently, to a decrease in the productivity of the pipe-rolling unit as a whole.

The aim of the invention is to increase the reliability of the device and increase its speed.

The goal is achieved by the fact that the device for holding the mandrel of a continuous rolling mill, containing a drive carriage, hydraulic cylinders located on it, mandrel grippers and their movement mechanism, is equipped with additional plunger cylinders, the cavities of which are connected to the hydraulic synchro through a check valve 4Ш1 and through a safety valve with a reservoir fluid mounted

on the carriage and connected to the rod cavity of the hydraulic cylinder, and the mechanism for moving the mandrel grippers is in the form of a helical gear with teeth on the free ends of the grips and plungers of the plunger cylinders, which axes are wedged perpendicular to the grips.

 Fig. 1 shows a device for holding the frame 5, view in Alan;

cut on

not FIG,

on

FIG. 3 - section & -B in FIG. 1 ..

The device for holding the mandrel of the continuous rolling mill is roughly composed of a drive carriage 1 located on it of the hydraulic cylinder 2 with a spring 3. dia1. / 5trachnally arranged arbor grips 4 with a helical cut 5, additional plunger cylinders 6 having a plunger, ep 7 with a helical cut 8, check valves 9, fused. nigel valve 1O, liquid reservoir 11 and adjustable stops 12.

The device works as follows,

In the initial position, the drive carriage 1 occupies a position ensuring an optimally defined clearance between its front end and the shank: m mandrel equipped with a sleeve. The stops 12, installed in front of the first mill stand, are adjusted for the specified retention stroke. Approximately 310 Grips 4 are separated, the piston of the hydraulic cylinder 2 is in the extreme left position with overlap of the cable communicating through the 1 pipe with the fluid reservoir 11. When the carriage moves forward to the mill, the shank the mandrel comes into contact with the rod of the hydraulic cylinder 2. The liquid moves from the nopuiHeBoro space through the holes with check valves 9 in the cavity of the plunger cylinders 6. The spring 3 is compressed. The plungers 7 through the helical engagement of the surfaces inform the grippers about the movement of their closing at the smaller diameter of the mandrel shank. The drive of the carriage 1 is turned on to hold the correction. The safety valve 10 at the same time from; 1dulir a pressure bar that prevents the fluid from passing to the fluid reservoir when the plunger 7 is moved and the grips are closed at the last end of the mandrel. Upon reaching the chosen hold-hold stroke, the grippers 4 are opened when the protruding ends of the plunger 244 come into contact with the stops 12. At the same time, the fluid from the cavities of the plunger cylinders 6 is displaced into the fluid reservoir 11 through the safety valve 10. rolled pipe. When reverse movement of the carriage 1 to its original position, the spring 3, npetjflolev resistance friction of the piston hydraulic cylinder 2, returns it to its original position (leftmost). (Push out into reservoir 11 through additional pipelines. The proposed device for holding the mandrel of a continuous tube rolling mill as compared with the holding mechanism of the mandrel on the TPO ZO-102 with a continuous mill increases the reliability of the device while increasing its speed, which leads to reduction of the total rolling cycle on a continuous mill with a retained mandrel by 0.25 s and allows to obtain an annual economic effect in the amount of 50,400 rubles.

Claims (1)

A DEVICE FOR RETAINING THE CORRECTION OF THE CONTINUOUS PIPING ROLLING STATION, containing a drive carriage, a hydraulic cylinder located on it, mandrel grips and a mechanism for moving them, characterized in that, in order to increase the reliability of the device and increase its speed, it is equipped with plunger cylinders whose cavities are connected with a hydraulic cylinder through check valves and through a safety valve - with a fluid reservoir mounted on the carriage and connected by a cd rod cavity of the hydraulic cylinder, and the mechanism is moved I zahvate® reference is made in the form of a helical transmission with the teeth of the free ends of the grippers and plunger of a plunger cylinders, the axes of which are arranged perpendicularly grippers. ^Ί 2 6 9 Fig 1 107 93 24