RU2367532C1 - Method of three-roller stand of lengthwise-rolling mills and lengthwise-rolling mill - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed method comprises disconnecting two-hinge spindles fitted above support beams from working stand rollers, supporting disconnected spindles, turning the latter through 20 to 30° due to hinge skew on the reduction gear side and maintaining it in the said position to allow the stands to move unobstructed from rolling axis over support beams. Proposed multi-stand lengthwise-rolling mill comprises foundation, its slots accommodating three-roll working stands, three electric drives with reduction gears coupled with each roller of operating stand via two-hinge spindle. It comprises also spindle disconnection device, two-hinge spindle, spindle supports and support beams for stand transfer. Device to support each spindle represents a lever pivoted onto separate post and furnished with a ledge hinged to hydraulic cylinder rod. The lever has roller to interact with spindle. The same post has a screw stop to control the force roller is pressed to spindle. Spindle disconnection device is accommodated on reduction gear housing aligned with spindle axis. Spindle hinge features skew angle α=20 to 30°.

EFFECT: reduced mill crosswise sizes, easier mill servicing.

2 cl, 4 dwg

Description

The invention relates to the field of pipe production, and more specifically to a method of transshipment of three-roll stands of a multi-bench longitudinal rolling mill.

The invention can be most effectively used in a multi-cantle longitudinal rolling mill with three-roll working stands, when the upper roll drive is located vertically, and two side drives are at an angle of 30 ° to the horizontal.

There is a method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill and a multi-stand mill (see German patent No. 10015285, Mcl B21B 31/10 application. March 28, 2000, publ. October 18, 2000).

The known method includes disconnecting the double-hinged spindles from the rolls of the working stand in one of the hinges, maintaining the disconnected spindles and transverse movement of the stands from the rolling axis along the support beams located horizontally.

The well-known multi-stand longitudinal rolling mill comprises a bed, in the grooves of which are located three-roll working stands, electric motors with gears connected to each of the rolls of the working stand by means of double-hinged spindles, means for disengaging the spindles and horizontally arranged support beams of the transshipment device.

A disadvantage of the known method of transshipment of three-roll stands and a multi-bench longitudinal rolling mill is the large transverse dimensions of the mill, due to the design of the drive located under the support beams of the transshipment device.

Another disadvantage is the significant deepening of the foundation of the mill due to the location of the drive of one of the work rolls in it, which creates inconvenience in the maintenance and repair of the mill.

Of the known closest in technical essence is the method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill and a multi-stand mill, described in PCT application WO 97/19767 M. cl. B21B 17/04 claimed November 29, 1995, publ. 10/10/1996

This method of transshipment of three-roll stands of a multi-roll longitudinal rolling mill includes disconnecting the double-hinged spindles from the rolls of the working stand in one of the hinges, maintaining the disconnected spindles and transverse movement of the stands along the support beams of the transfer device.

The well-known multi-stand longitudinal rolling mill with three-roll working stands contains a bed in the grooves of which are three-roll working stands, three electric motors with gears connected to each of the rolls of the working stand by means of a double-hinged spindle, means for disengaging the spindles, means for supporting the spindles and support beams of the transshipment device having the ability to install at an angle by means of a hydraulic cylinder.

A disadvantage of the known method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill and of the multi-stand mill itself is the large transverse dimensions, since the transshipment of the stands is carried out in the transverse direction on both sides of the mill along the support beams, which take the stands in an inclined position and then rotate together with the stand and are installed horizontally.

Another disadvantage of the known method of transshipment of three-roll stands and the multi-stand mill itself is a significant deepening of the foundation, which complicates the maintenance of the mill and its repair.

The objective of the present invention is to provide a method of transshipment of three-roll stands of a multi-stand mill for longitudinal rolling and the design of a multi-stand mill for its implementation, which allows to reduce the transverse dimensions of the mill, to reduce the depth of the foundation, to improve maintenance of the mill.

The problem is achieved in that the method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill, comprising disconnecting the double-hinged spindles from the rolls of the working stand in one of the hinges, maintaining the disconnected spindles and lateral movement of the stands from the rolling axis along the support beams, according to the invention after disconnecting those under the support beams spindles from rolls of stands, they are turned at an angle of 20-30 ° by skewing in the hinge from the side of the gearbox and support in this position for free st stands of rolling movement along the axis of the support beams. A multi-stand longitudinal rolling mill comprising a bed in the grooves of which are three-roll working stands, three electric drives with gears connected to each of the rolls of the working stand by means of a double-hinged spindle, means for disengaging the spindles, means for supporting the spindles and a transshipment device with support beams according to the invention means for supporting each spindle is made in the form of pivotally mounted on a separate rack by means of the axis of the lever carrying the roller for interaction with an indel and having a protrusion pivotally connected to the rod of the hydraulic cylinder pivotally mounted on the said strut, with an additional lever fixed to the axis, the free end of which is mounted in cooperation with an adjustable screw stop located on the same strut, means for disconnecting each spindle is placed on the housing the corresponding gearbox is coaxial to the spindle axis, and the spindle hinge on the gearbox side has a skew angle α = 20-30 °.

This embodiment of the method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill and the constructive implementation of a multi-stand longitudinal rolling mill will reduce the transverse dimensions of the mill due to the fact that the double-hinged spindles located on the side of the transshipment device have the opportunity to fall at an angle α = 20-30 ° down from the support beams and thereby do not impede the movement of the stands in the direction of the transshipment device. In addition, the proposed solution will reduce the depth of the foundation and improve the conditions of service.

Since the invention is most effectively used in the mill scheme, when the upper roll drive is located vertically, and two side drives are located at an angle of 30 ° to the horizontal, therefore, to ensure the largest and sufficient clearance between the spindles and each rolling stand moved along the beams, the upper spindle of the side drive is necessary located under the support beams, rotate around its hinge by an angle α = 30 °, and the lower one by a smaller angle, it is enough by an angle α = 20 °.

When the upper spindle is rotated by an angle α> 30 °, and the lower spindle by an angle α> 20 °, the mentioned gap does not change, that is, a further increase in the angle is not effective.

The rotation of the upper spindle by an angle α <30 °, and the lower spindle by an angle α <20 ° is not sufficient for free movement of the stand to the transshipment position.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

Figure 1 - shows a General view of a multi-stand mill for longitudinal rolling, for example six-stand, in plan;

figure 2 is the same, a view along arrow A in figure 1;

figure 3 is the same, view along arrow A (option for transshipment);

figure 4 - place B in figure 2.

The method of transshipment of three-roll stands of a multi-stand longitudinal rolling mill is as follows. Double-hinged spindles in one of the hinges are disconnected from the rolls of the working stand. The maintenance of the disconnected spindles is carried out using the support means. The disconnected spindles located under the support beams are turned at an angle α = 20-30 ° by skewing in the hinge from the gearbox side and supported in this position for free movement of the stands from the rolling axis. Then the working stands are moved along the support beams in the transverse direction from the axis of rolling for installation under a crane or on a transport trolley. A multi-stand longitudinal rolling mill comprises a bed 1, in the grooves of which are located three-roll working stands 2, electric drives 3 with gears 4 connected to each of the rolls 5 of the working stand 2 via double-joint spindles 6, means 7 for disengaging the spindles 6, means for supporting the spindles 6 and supporting beams 8. Means for supporting each spindle is made in the form of a lever 11 pivotally mounted on a separate column 9 by means of an axis 10, having a protrusion 12, pivotally connected to the rod 13 of the hydraulic cylinder 14, pivotally closed warmed up on the stand 9. A roller 15 is pivotally mounted on the lever 11 to interact with the spindle 6. An additional lever 16 is fixed on the axis 10, the free end of which is mounted in cooperation with an adjustable screw stop 17 located on the same stand 9. Means 7 for disconnecting each spindle 6 is placed on the housing 18 of the corresponding gear 4 coaxially to the axis of the spindle. The hinge of the spindle 6 on the side of the gearbox 4 has a skew angle α = 20-30 °.

During the operation of the mill, the rolls of the stands are subjected to intense wear and tear, therefore, handling of the stands is required. For transshipment of stands, the mill is stopped. The rollers 15 by means of the hydraulic cylinder 14 are raised to contact with the spindles 6, and the force of pressing the rollers against the spindles is limited by the adjustment of the screw stops 17.

Means 7, each spindle 6 is disconnected from the roll 5 of the working stand. Then lowering the rollers 15 with the hydraulic cylinder 14, the upper spindles 6 are turned down by 30 °, and the lower spindles 6 by 20 ° by turning them in hinges from the gearbox 4. Next, the working stands are freely moved along the support beams 8 in the transverse direction from the rolling axis.

Installation of new stands is carried out in the reverse order.

The proposed method for transshipment of three-roll stands of a multi-stand longitudinal rolling mill and a multi-stand mill for its implementation, in comparison with the known ones, can reduce the transverse dimensions of the mill, reduce the depth of the foundation and improve the maintenance of the mill.

Claims (2)

1. A multi-stand longitudinal rolling mill comprising a bed in the grooves of which are three-roll working stands, three electric drives with gears connected to each of the rolls of the working stand by means of a double-hinged spindle, means for disconnecting the spindles, means for supporting the spindles and a transshipment device with support beams, characterized in that the means for supporting each spindle is made in the form of pivotally mounted on a separate rack by means of an axis of a lever carrying a roller for interacting with an indel and having a protrusion pivotally connected to the rod of the hydraulic cylinder pivotally mounted on the said strut, with an additional lever fixed to the axis, the free end of which is mounted in conjunction with an adjustable screw stop located on the same strut, means for disconnecting each spindle is placed on the housing the corresponding gearbox is coaxial to the spindle axis, and the spindle hinge on the gearbox side has a skew angle α = 20-30 °. 2. The method of transshipment of three-roll working stands of a multi-stand longitudinal rolling mill, including disconnecting the double-hinged spindles from the rolls of the working stand in one of the hinges, maintaining the disconnected spindles and transverse movement of the stands from the rolling axis along the support beams, characterized in that after disconnecting the spindles under the support beams from rolls of stands, they are turned at an angle of 20-30 ° by skewing in the hinge from the gearbox side and supported in this position for free movement of the stands from the axis of pellets along the support beams.

Images