Device for adjusting a roll in a roll stand

Abstract

The invention relates to a device for adjusting a roll in a roll housing 210 of a roll stand. The device comprises a motor for providing an adjusting force for the roll; a drive shaft 120 that can be actuated in a rotatory manner by the motor; and a pressure spindle for transmitting the adjusting force of the motor to the roll. In order to do away with the upstream worm gear used in the prior art, according to the invention, the motor is designed in the form of a hydro- or torque-motor, the pressure spindle 130 is provided with an axially oriented cylindrical receiving space on the motor-side end face 132, the drive shaft 120 can project into the receiving area of the pressure spindle, and the pressure spindle 130 and the drive shaft 120 are coupled to one another in a rotatory manner inside the receiving area.

Claims

1. Device (100) for adjusting a roll (260) in a roll housing (210) of a roll stand, comprising: a motor (110) in the form of a hydro- or torque motor for adjusting a vertical position of the roll; a drive shaft (120) rotatable by the motor; a vertically displaceable pressure spindle (130) for transmitting an adjusting force to the roll, wherein the pressure spindle has, at a motor-side end surface (132) thereof, an axially extending cylindrical receiving space (140), the drive shaft (120) projects into the receiving space of the pressure spindle, and the pressure spindle (130) and the drive shaft (120) are connected, in an interior of the receiving space (140) for joint rotation with each other by a form-locking connection, characterized in that the form-locking connection is so formed that the pressure spindle (130) has, on an inner side of the receiving space a spline hub profile (134) distributed over a circumference thereof, and the drive shaft (120) is formed as a spline shaft for engaging in the spline hub profile.

2. Device according to claim 1, characterized in that a spline hub sleeve (135) is inserted at the motor-side end surface of the pressure spindle in a axial direction, is fixedly connected with the pressure spindle (130), and forms the spline hub profile (134) of the inner side of the receiving space.

3. Device according to claim 1, characterized in that a coupling (150) is provided for a releasable rotary connection of the drive shaft (120) with the motor (110).

4. Device according to claim 1, characterized in that the motor (110), the drive shaft (120) and the pressure spindle (130) are axially aligned one after another.

5. Roll stand, comprising a roll housing (210) on a drive side and a roll housing on an operating side thereof between which rolls for rolling a rolled stock are rotatable supported in respective chocks (220), wherein at least one of the roll housings is characterized by including the device (100 for adjusting a roll (260) in the roll housing (210) having: a motor (110) in form of a hydro- or torque motor for adjusting a vertical position of the roll; a drive shaft (120) rotatable by the motor; a vertically displaceable pressure spindle (130) for transmitting an adjusting force to the roll wherein the pressure spindle has, at a motor-side end surface (132) thereof, an axially extending cylindrical receiving space (140), the drive shaft (120) projects into the receiving space of the pressure spindle, and the pressure spindle (130) and the drive shaft (120) are connected, in an interior of the receiving space (140) for joint rotation with each other by a form-locking connection, characterized in that the form-locking connection is so formed that the pressure spindle (130) has, on an inner side of the receiving space a spline hub profile (134) distributed over a circumference thereof, and the drive shaft (120) is formed as a spline shaft for engaging in the spline hub profile.

6. Roll stand according to claim 5, characterized by an axial bearing (230) for rotatably supporting the drive shaft (120); and by a first support device mounted on an upper side of the roll housing for retaining the axial bearing at a first fixed predetermined axial distance (d1) to the upper side of the roll housing and for retaining the rotatably supported drive shaft (120) in a fixed position relative to the roll housing (210).

7. Roll stand according to claim 6, characterized in that the axial bearing is formed as a spherical roller bearing.

8. Roll stand according to claim 6, wherein the roll housing is characterized by a second support device (250) supported on the first support device (240) for retaining the motor (110) at a fixed predetermined vertical distance (d2) to the upper side of the roll housing.

9. Roll stand according to claim 8, characterized in that between the first and second support devices (240, 250) at a height of the axial bearing (230), there is provided a lubricant chamber (245) with a lubricant feed (246) and with at least one circular opening for passing the drive shaft therethrough, for lubricating the axial bearing, wherein an overflow (247) for lubricant is formed on a bottom side of the lubricant chamber.

10. Roll stand according to claim 9, characterized in that on the motor-side end surface of the pressure spindle, a shell-shaped roof (136) is provided for collecting lubricant that flows off through the overflow (247) downwardly, wherein the roof further has a further circular opening for passing the drive shaft (120) therethrough, wherein an annular gap (248) is formed between the drive shaft and a rim of the further circular opening, and in that within the cylindrical receiving space in the pressure spindle (130), a lubricant flow-off (249) is provided for discharging the lubricant penetrated through the first annular gap and flowing in the interior of the receiving space along the drive shaft downwardly, through a second annular gap (270) between the pressure spindle (130) a bore in the roll housing (210).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The description is supplemented by two drawing figures, wherein:

(2) FIG. 1 shows a schematic view of the inventive device; and

(3) FIG. 2 shows a detailed view of the device shown in FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(4) FIG. 1 shows an inventive device 100 for adjusting a roll in a roll housing 210 of a roll stand. The device includes a motor 110, preferably a torque motor or the hydraulic motor, shorty, hydromotor for providing an adjust position for the roll. The motor 110 is located above the roll housing 210 and is supported by a second support unit 250 opposite an outer side of the roll housing 210, wherein the second support unit 250 itself is supported against a first support unit 240. The two support units fixedly position the motor 110 at a fixed distance d2 to the outer side of the roll housing 210. The hydraulic motor is axially aligned with a drive shaft 120 which is rotated thereby. Advantageously, a coupling 150 is provided between the drive shaft 120 and the motor and is arranged in the second support unit 250. The drive shaft 120 is secured, e.g., in the transition region between the first and second support units 240, 250, in an axial bearing 230 at a predetermined height d1 above the outer side of the roll housing 210. By positioning the drive shaft 120 in the axial bearing, the drive shaft 150 is held in a predetermined relative position or height to the roll housing 210.

(5) The drive shaft 120 serves for transmission of a torque generated by the motor 110 to a pressure spindle 130 which, in turn, transmits the adjusting force to the roll. The shaft of the motor 110 on one side of the coupling, the drive shaft 120 on the other side of the coupling, and the pressure spindle 130 are axially aligned, i.e., their central line extends in an axial, here, perpendicular direction W.

(6) The hydro-or torque motor is, preferably formed for applying a load torque of above 4 kNm during rough rolling in a conventional hot strip train, or above 30 kNm during rolling of heavy metal sheets. These values are held under assumption of very favorable, small friction ratios; for security reasons, for practical use, these values are enhanced with a safety coefficient.

(7) On the motor end side 132 of the pressure spindle 130, an axially extending cylindrical receiving space 140 is formed for receiving the drive shaft 120 in the assembled condition of the device. For transmitting the motor-generated torque to the pressure spindle 130, the drive shaft 120 and the pressure spindle 130 are connected, preferably formlockingly, in the interior of the receiving space 140 for joint rotation with each other. E.g., the pressure spindle 130 is formed, on the inner side of its receiving space 140, as a spline hub, i.e., it is provided with a spline hub profile on its circumference, and simultaneously, the drive shaft is formed as a spline shaft for engaging the spline hub profile of the pressure spindle 130. Alternatively, the formlocking connection can be obtained by forming the receiving space of the pressure spindle as a polygonal hub and the drive shaft as a polygonal shaft, wherein the polygonal shaft is engaged in the polygonal hub.

(8) As its end remote from the motor, the pressure spindle has a so-called pressure head 160 that acts on a roll chock in the roll stand. With a two-high stand which has two drive shafts, the pressure head 160 of the pressure spindle 130 acts on the sleeve bearings, which are also called chocks, of the drive shafts, and when used in four-high stand having two work and two back-up rolls, acts on chocks of the back-up rolls. The pressure head 160 serves for decoupling of the rotational movement of the spindle from its simultaneous vertical movement, so that a pure vertical movement is applied to a respective chock of the adjustable roll, without a rotational component. The vertical movement of the pressure spindle 130 is carried out using a retainer nut 170 which is mounted in the roll housing 210 without possibility of rotation. The pressure spindle 130 is screwed into the retainer nut. When the drive or spline shaft 120 rotates the pressure spindle 130, the retainer nut simultaneously provides for the vertical movement of the pressure spindle, whereby the adjustment position of the roll chock which is located beneath the pressure spindle 160 can be adjusted.

(9) FIG. 2 shows in detail the elements shown in FIG. 1. E.g., the spline profile 134 on the inner side of the cylindrical receiving space 140 is clearly visible, with the spline profile being formed in a spline hub sleeve 135 the longitudinal and transverse cross-sections of which are shown in FIG. 2. The spline hub sleeve can, e.g., be secured in the receiving space 140, without the possibility of rotation, with a key, not shown in FIG. 2. Complementary to the spline hub profile, the spline shaft 120, which engages in the spline hub for transmitting the torque, is uncoupled.

(10) FIG. 2 further shows that between the first support unit 240 and the second support unit 250 which are called lantern supports, a lubricant chamber 245 is provided which is supplied by a lubricant feed 246. The lubricant is used for lubrication of the axial bearing 230. On the bottom side of the lubricant chamber 245, an overflow 247 is formed which insures that the lubricant does not overrun a predetermined height defined by the height of the overflow. The excess lubricant flows off the lubricant chamber 245, through the overflow 247 into a located beneath a shell-shaped roof 136 provided on the motor-side end surface of the pressure spindle 130. The roof 136 has a circular opening for passing of the spline shaft therethrough. Between the spline shaft 120 and the rim of the circular opening, an annular gap 240 is formed through which the lubricant flows downward into the receiving space 140 for lubricating located there polygonal or spline gear consisting of the hub and the shaft. From the receiving chamber 140, the lubricant flows further through a lubricant overflow conduit 249 into a fixing screw in a second annular gap 270 between the pressure spindle 130 and a bore is the roll housing 210 in which the pressure spindle is located.

(11) As shown in FIGS. 1 and 2, the same components of the inventive device, i.e., the motor 110, the coupling 150, the drive or spline shaft 120, and the pressure spindle 130 are axially aligned. The motor directly drive the drive shaft via the coupling.

(12) Above the motor 110, a position sensor 180 can be stationary arranged for sensing a respective actual position of the roll 260. The position sensor has a sensor rod 182 that, preferably extends into an axial bore 192. The bore extends through the motor 110, the coupling 150, the drive or spline shaft 120, and the pressure spindle 130 up to the pressure head 160. The sensor rod 182 projects into the pressure spindle and extends there through a ring-shaped magnet 190 which is fixedly connected with the pressure spindle. During the vertical movement of the pressure spindle, the magnet is vertically displaced relative to the stationary sensor rod 192. The position sensor 180 determines the respective spindle 130 based on this relative movement.

LIST OF REFERENCE NUMERALS

(13) 100 Device 110 Motor 120 Drive Shaft 122 Teeth of the spline shaft 130 Pressure spindle 132 Motor-side end surface of the pressure spindle 134 Spline hub profile 135 Spline hub sleeve 136 Roof 140 Receiving space 150 Coupling 160 Pressure head 170 Pressure nut 180 Position sensor 182 Sensor rod 190 Annular magnet 192 Bore 210 Roll housing 220 Chock 230 Axial bearing 240 First support device 245 Lubricant chamber 246 Lubricant feed 247 Overflow 248 First annular gap 249 Lubricant flow-off 250 Second support device 260 Roll 270 Second annular gap between the pressure spindle and the roll housing d1 Distance of the axial bearing from the roll housing d2 Distance of the motor from the outer side of the roll housing W Vertical axial direction