SU1731310A1 - Drive of stand of tube cold rolling mill - Google Patents

Abstract

Usage: in the drive stands of cold rolling mills. Summary of the invention: in the drive stand of the cold rolling mill tube, a pair of driving crank gears with fingers connected by connecting rods to the rolling stand is engaged with an additional pair of crank gears with fingers connected by means of connecting rods with sliders of the counterbalancing mechanism. The fingers of the crank wheels are mounted symmetrically with respect to the central perpendicular of the wheel supports, which are perpendicular to the slide guides. . 1 il.

Description

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WITH

The invention relates to pipe production, in particular to drives for stands for cold rolling mills.

The known drive stand of the cold rolling mill tube containing a pair of drive crank gears with fingers and crank rods and a balancing device, and the fingers of the crank gears and the fingers of the balancing rods of the device are at an angle of 90 ° to each other on the driving crank wheels.

The closest in technical essence to the achieved result to the proposed is the drive of the cold rolled rolling mill, containing a pair of drive crank gears with fingers, connecting rods, and an extra pair of crank gears with fingers, connected by means of additional rods with a balancing mechanism, made in the form of sliders.

The disadvantage of the known drive is the partial balance of inertia forces and external forces causing vibrations of the base of the mill, impairing its dynamic properties and quality of rolling.

The aim of the invention is to increase the reliability of operation by improving the balancing.

In the drive stand of the cold rolling mill tube containing a pair of drive crank gears with fingers, connecting rods connected to them and an additional pair of crank gears with fingers connected by additional connecting rods with a balancing mechanism made in the form of sliders, the crank wheels are equipped

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counterweights, and their fingers are installed symmetrically with respect to the central perpendicular of the wheel supports, which are perpendicular to the guides for sliders, which have a weight equal to the weight of the moving parts of the cage, and are equipped with a pneumatic system and software unloader identical to copying technological forces in the opposite direction.

The drawing shows a kinematic diagram of the drive of the stand of the cold rolling mill tube.

The drive of the stand of the cold rolling mill tube contains a pair of drive motors from an electric motor (not shown) through a shaft with gears of crank gears 1 with fingers 2, connecting rods 3 connected at one end with fingers, and the other with a stand, the balancing mechanism in the form of a creeper There are additional rods 4 and pins 5 associated with it. The drive is also equipped with an additional pair of crank gears 6, in which the fingers are installed 5 rods 4 balancing mechanism, having a pneumatic system with a program unloader.

Crank gears 1 and 6 are mounted in bearings 7 and 8 and are equipped with equal weights 9 and 10. In this case, the cranking gears are installed symmetrically relative to the central perpendicular of the wheel supports, perpendicular to the guides of the sliders, having a weight equal to the weight of cage parts

The drive works as follows.

Rotation from the electric motor through the shaft and gears is transmitted to the crank gears 1 and additional crank gears 6, which, by means of connecting rods 3 and 4, communicate the reciprocating movement of the working stand and the slider of the counterbalancing mechanism. With the help of the pneumatic system, an additional force is created that is equal, but opposite to the force of the useful resistance of the drive cage. This allows not only the balance between the force of gravity and the inertia of the drive links, but also the external forces of useful resistance.

The proof of the static balance of the moving masses of the drive follows from the following considerations. If the masses of rods 3 and 4 are statically replaced with lumped masses located in the centers of their movable joints, then the lumped masses located on the drive stand and the slider, along with progressively

the moving masses are fully balanced with their equality, since, due to the identity and symmetry of the two crank-slider mechanisms, their progressively moving parts make the same, but oppositely directed movements. The remaining concentrated masses, obtained from the replacement of the mass of the connecting rods and located on the axles of the fingers 2 and 5, are balanced by counterweights 0 and 10. Thus, the main vector of inertia forces is zero, since the common center of mass of all moving links is fixed and located in the middle of the segment, connecting supporting joints of crank gears.

The dynamic balance of the drive also results from the counter-directional movement of identical slider crank mechanisms. In this case, the condition must be met

I3 + 1pree (11+ l2) Z3 / Z2 + le + InpiO where li, I2, s, le are the axial inertia of the indicated links;

Inpg and direct moments of inertia of counterweights 9 and 10 relative to their rotation axes;

2.2, 2.3 - the number of teeth of gears.

The proposed drive is fully self-equilibrated and, compared to the well-known drives of the cold-rolling mill stands, provides incomparably low vibroactivity, thus ensuring high reliability of operation.

Claims (1)

The invention of the drive stand of the cold rolling mill tube containing a pair of driving crank gears with fingers, connecting rods connected to them and an additional pair of crank gears with fingers connected by means of additional rods with a balancing mechanism, characterized by the purpose of increasing the reliability of work due to the improved equilibration, the crank wheels are equipped with counterweights, and their fingers are set symmetrically with respect to the central perpendicular ra supports wheels, which is perpendicular to the guide for the slides, which have a mass equal to the mass of the moving parts of the cage, and provided with a pneumatic system software unloader identical feeler technological force in the opposite direction.