JP2915408B1 - Spindle support device for rolling mill - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To directly support a tilted spindle in a freely rotatable manner, to easily work without disassembling the spindle when replacement or maintenance of a bearing is required, and to support grease lubrication in a bearing in a rolling mill. Provide equipment. SOLUTION: A pair of upper and lower drive shafts are respectively connected to spindles 8 with respect to rotation axes of a pair of upper and lower horizontal work rolls 2 and 3.
In a drive system of a section rolling mill in which the driving force is transmitted by being connected to the connecting portions at both ends via a universal joint by means of a spindle 9, a spindle supporting device for supporting a substantially intermediate position in the longitudinal direction of each of the upper and lower spindles 8.9. A roller bearing 25 is used as a bearing 22 for rotatably supporting the outer peripheral surface of the spindle 20. A bearing box 28 of the upper spindle having the bearing 22 is swingably suspended by a hydraulic cylinder 36, The bearing box 28 of the lower spindle having the bearing 22 is swingably lifted by a hydraulic cylinder 40, and the pressure by each of the hydraulic cylinders 36, 40 is set to a size that offsets the own weight of the spindles 8, 9. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mill for rolling section steel (regardless of a universal rolling mill or a two-high mill), in which upper and lower horizontal work rolls (hereinafter, also referred to as horizontal rolls or work rolls) are spindles. More particularly, the present invention relates to a spindle support device (also referred to as a spindle carrier or a spindle support) for supporting the spindle.

[0002]

2. Description of the Related Art Upper and lower horizontal rolls need to be moved up and down in order to change the distance between the rolls depending on the thickness, shape and size of the section steel to be rolled. For this reason, a universal joint is used together with a transmission spindle to enable the horizontal roll to move up and down to transmit the driving force. Normally, the maximum tilt angle of the spindle is 3 °
Because it is limited to the front and rear, when the vertical roll lift is large, the length of the spindle must be increased to cope with it, so the weight of the spindle increases, but when the weight of the spindle increases, the reduction gear bearings and horizontal It may affect the rotation state of the roll. Therefore, conventionally, a device for rotatably supporting the spindle is provided to reduce the influence on the bearing and the horizontal roll of the speed reducer.

[0003] For example, in a driving device for a rolling mill described in Japanese Patent Publication No. 2-49167, a connecting shaft for transmitting a driving force is provided horizontally separately from a spindle through which a universal joint is interposed. The connecting shaft is directly rotatably supported by the housing via a bearing. In addition, the drive device supports the connecting shaft while keeping it horizontal, and does not support the spindle.
Further, the driving system described in the publication is of a type in which the upper and lower horizontal rolls are driven by separate driving machines. In other words, the driving device described in the publication is a driving device that drives the upper and lower horizontal rolls independently, and is developed for the purpose of reducing the inclination angle of the spindle.

[0004] In addition, although not shown, a device for rotatably supporting a spindle via a metal bush instead of a bearing has been put to practical use.

[0005]

However, the above-mentioned conventional spindle support device has the following problems to be solved.

The former (Japanese Patent Publication No. 2-49167)
Since the connecting shaft is interposed separately from the tiltable spindle, the distance between the driving device and the horizontal roll becomes longer, the rolling equipment as a whole becomes larger, and a larger installation area is required. Also,
Since the driving of the upper and lower horizontal rolls is performed by separate driving devices, the installation area of the driving devices is increased, and the equipment cost is also increased.

The former is a device that fixedly supports the connecting shaft in a horizontal state, and therefore it is difficult to apply this device as a spindle support device that tilts or changes the tilt angle.

The former uses a bearing having a cylindrical housing, and has a structure in which only covers on both sides of the bearing are detachable as judged from the drawings attached to the official gazette. Workability is extremely poor because it is necessary to disassemble the spindle and spindle.

In the latter case (metal bush), when the horizontal roll is rotated at a high speed, a forced circulation lubrication system must be adopted, so that the forced circulation system becomes complicated, and a failure of the circulation pump or oil leakage in the piping occurs. If a problem occurs in the lubrication system, for example, the metal bushing may immediately burn.

[0010] In the latter, after replacing the metal bush, it is necessary to perform a break-in operation until the surface can be removed.
Work efficiency is low because low-speed operation must be performed for a long time and the operation cannot be started immediately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can directly support a tiltable spindle in a freely rotatable manner, and can easily perform such operations without disassembling the spindle when replacement or maintenance of a bearing is required. It is an object of the present invention to provide a spindle support device of a rolling mill that can perform the lubrication inside the bearing with grease.

[0012]

In order to achieve the above object, a spindle supporting device for a rolling mill according to the present invention comprises:
In a drive system such as a section steel rolling mill that transmits driving force by connecting via a universal joint to a connecting portion at both ends by a spindle from a pair of upper and lower drive shafts to a rotating shaft of a pair of upper and lower horizontal rolls, b) A spindle supporting device that supports a substantially middle position in the longitudinal direction of each of the upper and lower spindles is configured as follows. That is, b1) a roller bearing is used as a bearing for rotatably supporting the outer peripheral surface of the spindle, and b2) a bearing box of an upper spindle having the bearing is swingably suspended by a fluid pressure cylinder. On the other hand, the bearing box of the lower spindle having the bearing is lifted up by a hydraulic cylinder so as to swing freely, and b3) the pressure by each of the hydraulic cylinders is set to a size that offsets the own weight of the spindle.

According to the spindle supporting device of the rolling mill of the present invention having the above-described structure, the spindle is supported by the bearing using the roller bearing, so that the outer diameter of the entire bearing can be reduced and the metal bush can be made compact. Unlike replacement, it can be put into operation immediately without the need for break-in operation, and can be lubricated with grease.There is no need to use a forced circulation lubrication system, which simplifies the lubrication system. It becomes difficult. Also, since the upper spindle is swingably suspended from above, and the lower spindle is supported so as to be able to swing upward from below,
Even when the inclination angle of the spindle is changed due to the elevation of the horizontal roll, the support device provided with bearings and the like swings naturally and follows the inclination of the spindle. Furthermore, since the pressure of the fluid pressure cylinder is set to a size comparable to the weight of the spindle, unnecessary external force that hinders rotation during rotation of the spindle does not act on the spindle, and it rotates smoothly while Since no unreasonable external force (especially lateral force) is applied when the roll is moved up and down, the horizontal roll can be moved up and down smoothly.

According to a second aspect of the present invention, the bearing housing and the roller bearing are divided into two parts in the circumferential direction, and a pair of rings (or ring-shaped flanges) projecting from the outer peripheral surface of the spindle at predetermined intervals in the axial direction. It is desirable to attach so as to surround the space between them and to detachably connect the divided surfaces.

According to the second aspect of the present invention, the rotational force in the radial direction is supported by the roller bearing, and the friction torque is small even when the horizontal roll rotates at a low speed, so that the phase angle stop position can be adjusted. Can be performed with high accuracy. In addition, the bearing and bearing box, including the roller bearing, are each divided into two (half) in the circumferential direction so that they can be connected and mounted so as to surround the outer peripheral surface between the rings of the spindle. When performing operations such as maintenance and maintenance, such operations can be performed easily and in a short time without disassembling the spindle or disconnecting the drive system.

According to a third aspect of the present invention, the upper fluid pressure cylinder is pivotally supported by a support shaft perpendicular to the axial direction of the spindle with the piston rod facing downward, and the lower end of the piston rod is connected to the upper spindle. Pivotally connected to the upper part of the bearing box by a support shaft parallel to the support shaft, the lower fluid pressure cylinder is fixed substantially vertically below the lower spindle with the piston rod facing upward, and at the upper end of the piston rod. A support portion having a top surface formed in an upwardly convex arcuate surface along the axial direction of the spindle is fixedly provided, and a flat receiving seat mounted on a lower surface of a bearing box of the lower spindle is provided on the support portion. Can be mounted.

According to the third aspect of the present invention, since the upper spindle is suspended from above in a pendulum manner, the spindle can be easily tilted and the spindle can smoothly rotate at high speed. obtain.
On the other hand, since the lower spindle is lifted upward from below and supports a flat plate-shaped receiving seat at the lower end of the spindle by an arc surface, the lower spindle can be easily tilted.

According to a fourth aspect of the present invention, the upper and lower bearing boxes may be provided with grease supply ports communicating with the inside of the bearing, and grease may be supplied into the bearing periodically.

According to the spindle support device of the fourth aspect, since the bearing is grease lubricated, there is no need to continuously supply grease. For example, grease is controlled from a supply source by a pump or the like by a timer or the like. Meanwhile, the grease can be supplied into the bearing from the greasing port periodically (periodically). Also, even if a trouble occurs in the lubrication system, the trouble is easy to deal with because the bearings and the like do not immediately seize.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spindle support device for a rolling mill according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic front view showing a drive system of a rolling mill provided with a spindle support device according to an embodiment of the present invention, in which a part is shown in cross section and both sides are omitted. 2 is an enlarged front view showing the spindle support device of FIG. 1 and its periphery, and FIG. 3 is an enlarged front sectional view showing a support portion of the lower spindle of FIG.

As shown in FIG. 1, the rolling mill 1 in this embodiment is
It is a high-mill type and has upper and lower horizontal work rolls 2 and 3 in a housing 4. The drive shafts 2a, 3a of the upper and lower work rolls 2, 3 are bosses 6a, 7 of the upper and lower connecting shafts 6, 7.
a is fitted in the inside a so as to be slidable in the axial direction and integrally rotatable. The other ends of the upper and lower connecting shafts 6, 7 are connected to one ends of driving spindles 8, 9 by universal joints 8a, 9a.
Are interposed. The driving spindle 8
・ The other end of 9 is another universal joint 8b ・ 9
b, the output shaft 10 above and below the pinion stand 10
a.10b. A drive shaft 11 of a drive motor is connected to the input shaft 10c on the other end side of the pinion stand 10 so as to be integrally rotatable, and this rotational power is distributed and transmitted to the upper and lower output shafts 10a and 10b.

The spindle support device 20 comprises a device 21A for supporting the upper drive spindle 8 and a device 21B for supporting the lower drive spindle 9. In the case of this example, the upper and lower support devices 21A and 21B on the spindles 8 and 9
3A, a pair of ring-shaped flanges 8f are provided at predetermined intervals as shown in FIG.
9f are protruded radially outward. The bearing 22 and the bearing box 28 of the supporting devices 21A and 21B have a common structure, and the bearing 22 is composed of a pair of semi-cylindrical bodies divided into two in the circumferential direction, and has a semi-cylindrical inner ring 23 and a semi-cylindrical outer ring 24. And a number of roller bearings 25 which are held by a semi-cylindrical retainer 26 and roll in contact with the inner ring 23 and the outer ring 24. The roller bearing 25 is a set of two roller bearings 25 spaced apart in the width direction. Are arranged at intervals in the circumferential direction. In this example, the inner ring 23 has a semi-cylindrical shape and is bolted by a fastening ring 23a. Reference numeral 27 denotes a spacer ring, which is disposed on both sides of the bearing 22, and is divided into two parts in the circumferential direction like other parts. In addition, the code | symbol 5 in FIG. 2 shows a sliding liner.

The bearing box 28 has a pair of semi-cylindrical housings 28a and 28b which can be divided, and has a structure which can be detachably connected by connecting bolts 29.
An annular oil seal 30 with a part cut off in the circumferential direction is attached to the outer peripheral surface of the f.9f, and a semi-annular ring cover 31 divided into two parts is attached around the periphery thereof.
Reference numeral 0 denotes a ring cover 31 which is fixed to the ring cover 31 with screws 32, while the ring cover 31 is provided with a bolt 33 in a hole 31 a penetrating therethrough in the circumferential direction with a gap in the circumferential direction, and a circumferential gap is formed in the bearing box 28. Screwed into the screw hole 28g provided and fastened. The lower support device 21B
The thickness of the lower housing 28b of the bearing housing 28 of FIG.
The upper housing 28a and the upper support device 2
It is formed thicker than the upper and lower housings of 1A. This is because the strength is increased in order to support on the tip of the cylinder rod of the hydraulic device, as described later. Further, a grease greasing port 28c penetrating vertically is formed at the center of the upper housing 28a of the upper and lower support devices 21A and 21B so as to communicate with the inside. In addition,
Reference numeral 28d denotes an annular race divided into two parts, and a large number of holes 28 are provided at the center of the race 28d at circumferential intervals.
e is drilled.

As shown in FIGS. 1 and 2, the upper support device 2
1A includes a substantially triangular support frame 34, and the support frame 34 is fixed on the grounding seat 19 by a lower end flange 34a. A horizontal mounting plate 34 is provided on the upper end of the support frame 34.
The bracket 35 is integrally formed, a bracket 35 is fixed on the mounting plate 34b, and a hydraulic cylinder 36 is pivotally mounted at the center of the upper end of the bracket 35 so as to be swingable right and left by a support shaft 37 downward. . A bracket 38 integrally fixed to the center of the upper end of the bearing box 28 is swingably connected to a plate-shaped bracket 37 fixed to the tip (lower end) of the piston rod 36a via a support shaft 39, The upper drive spindle 8 is supported by a hydraulic cylinder 36 so as to be suspended from above.

The lower support device 21B includes a hydraulic cylinder 40
The hydraulic cylinder 40 is fixed in a state of being buried vertically below the grounding seat 19 via a flange 40b integrally provided around the upper end. A support portion 41 having a convex arc-shaped top surface is fixedly provided at the tip (upper end) of the piston rod 40a, and a fixed width (supporting portion) is provided along the width direction at the center of the lower housing 28b of the bearing box 28. A groove 28f having a width capable of inserting the portion 41) is provided, and a flat receiving seat 42 is fixed to the lower surface of the lower housing 28b at the center of the groove 28f as shown in FIG.
The lower drive spindle 9 is provided with a hydraulic cylinder 40.
It is supported so as to be lifted (lifted) from below.

The hydraulic cylinders 36 and 40 of the upper support device 21A and the lower support device 21B exactly balance the weight of the drive spindles 8 and 9 (more precisely, the weight of the bearing 22 and the bearing box 28). It is set to generate a large hydraulic pressure. As a result, the piston rods 36a, 40a of the hydraulic cylinders 36, 40
As shown in FIG. 1, is extended to a position where unnecessary external force does not act on the upper and lower drive spindles 8 and 9, that is, a position where a no-load posture is maintained.
0 keeps the inclination angle reasonable and the spindle 8
9 rotates in a state where their own weights are offset.

FIG. 4 shows the vertical supporting device 21A of the above embodiment.
21B is a diagram showing a grease supply system to each bearing 22 of the bearing 21B.
And are connected to the upper and lower grease supply ports 28c by grease supply pipes 46 and 47. And
In this example, a supply pump (not shown) is operated at regular intervals by a timer, and grease is supplied into the bearing 22. The grease supplied into the bearing 22 stays for a predetermined time even when the driving spindles 8 and 9 rotate, so that even if a trouble occurs in the grease supply system, the bearing 22 and the like do not immediately burn. . Further, since the roller bearing 25 is used in the bearing 22,
When the driving spindles 8 and 9 rotate at low speed, in other words, even when the upper and lower work rolls 2 and 3 rotate at low speed, the friction torque is small, and therefore the power of the drive motor can be saved.

Further, for example, at the time of maintenance in the bearing 22 or replacement due to wear of the roller bearing 25, after removing the ring cover 31 and the oil seal 30,
Remove the connecting bolt 29 and remove the semi-cylindrical housing 28a.
・ Divide into 28b. Then, the inner race 23, the outer race 24, and the retainer 26 are each divided into two parts, and the roller bearing 25
Perform maintenance by replacing or cleaning. Therefore, there is no need to disassemble or remove the drive spindles 8 and 9, so that the operation can be performed easily and in a short time.

One embodiment of the spindle support device of the present invention has been described above, but the spindle support device can be implemented as follows.

The present invention is also applicable to a rolling mill of a type in which a driving device such as a driving motor is independently provided for each of upper and lower work rolls.

The present invention can be applied not only to a 2-high mill but also to a support device for a spindle for driving a horizontal work roll of a universal rolling mill.

The driving spindle is not limited to the type having a flange at the center in the longitudinal direction, and can be applied without a flange. The supporting device can be mounted even at a position offset from the center of the spindle toward the rolling mill.

[0033]

As is apparent from the above description,
The spindle supporting device for a rolling mill according to the present invention has the following excellent effects.

(1) According to the first aspect of the present invention, the inclined spindle can be directly rotatably supported, and when the replacement or maintenance of the bearing is required, the operation can be easily performed without disassembling the spindle.

In addition, since the spindle is supported by a bearing using a roller bearing, the outer diameter of the entire bearing can be reduced to make it compact, and unlike a metal bush, the main operation can be performed immediately without the need for break-in operation after replacement. And grease lubrication is possible, and there is no need to employ a forced circulation lubrication system, and burning due to lack of lubrication does not easily occur.

Further, since the upper spindle is slidably suspended from above and the lower spindle is slidably lifted from below and supported, it is possible to change the inclination angle of the spindle as the horizontal roll moves up and down. In addition, the bearing swings naturally to follow the tilting operation of the spindle, and because the pressure of the fluid pressure cylinder is set to a size almost equivalent to the own weight of the spindle, there is no need to hinder the rotation when the spindle rotates No external force acts on the spindle, and the spindle rotates smoothly, and at the same time, the spindle follows the vertical roll smoothly.

(2) According to the second aspect of the present invention, since the roller bearing has a small friction torque even when the horizontal roll rotates at a low speed, the driving force of the driving device can be saved and the phase angle position can be adjusted with high accuracy. In addition, since the bearing box including the roller bearing can be divided into two parts in the circumferential direction and attached and detached, the spindle can be disassembled or the drive system disconnected when performing roller bearing replacement or maintenance work. You can easily do these tasks without having to do anything.

(3) According to the third aspect of the present invention, since the upper spindle is swingably suspended from above, the spindle can be tilted without difficulty and the spindle can be smoothly rotated at high speed. At the same time, the lower spindle is lifted upward from below, and the convex arc surface supports the flat plate-shaped receiving seat at the lower end of the spindle, so that the lower spindle can be tilted easily, The rotation of the spindle at high speed can be performed smoothly.

(4) In the invention of claim 4, since the bearing is grease lubricated, there is no need to continuously supply grease, so that the bearing lubrication system is simplified and a trouble occurs in the lubrication system. Even so, the bearing and the like do not immediately burn.

[Brief description of the drawings]

FIG. 1 is an overall schematic front view showing a drive system of a rolling mill provided with a spindle support device according to an embodiment of the present invention, in which a part is shown in cross section and both sides are omitted.

FIG. 2 is an enlarged front view showing the spindle support device of FIG. 1 and its periphery.

FIG. 3 is an enlarged front sectional view showing a support portion of a lower spindle in FIG. 1;

FIG. 4 is a system diagram showing an embodiment of supplying grease to bearings 22 of upper and lower support devices 21A and 21B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling machine 2.3 Work roll 8.9 Driving spindle 8a / 8b / 9a / 9b Universal joint 8f / 9f Ring-shaped flange (ring) 10 Pinion stand 20 Spindle support device 21A / 21B Support device 22 Bearing 23 Inner ring 24 Outer ring 25 Roller bearing 26 Cage 28 Bearing box 28a / 28b Housing 29 Connecting bolt 30 Oil seal 31 Ring cover 28c Grease supply port 36/40 Hydraulic cylinder (fluid pressure cylinder)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 35/14

Claims (4)

(57) [Claims] 1. A drive of a section rolling mill or the like that transmits driving force by connecting from a pair of upper and lower drive shafts to a connecting portion at both ends of the pair of upper and lower horizontal work rolls via a universal joint by a spindle, respectively. A spindle support device for a rolling mill, wherein a spindle support device for supporting a substantially intermediate position in a longitudinal direction of each of the upper and lower spindles is configured as follows. A roller bearing is used as a bearing for rotatably supporting the outer peripheral surface of the spindle. A bearing box of an upper spindle having the bearing is swingably suspended by a fluid pressure cylinder, while a lower bearing having the bearing is provided. The bearing box of the side spindle is lifted up by a hydraulic cylinder so as to be able to swing freely, and the pressure of each of the hydraulic cylinders is set to a size that offsets the own weight of the spindle. 2. The bearing including the bearing box and the roller bearing is divided into two parts in the circumferential direction, and is mounted on the outer peripheral surface of the spindle so as to surround a pair of rings protruding at predetermined intervals in the axial direction. 2. The spindle support device of a rolling mill according to claim 1, wherein the split surfaces are detachably connected to each other by a connecting means. 3. The upper hydraulic cylinder is pivotally supported by a support shaft perpendicular to the axial direction of the spindle with the piston rod facing downward, and the lower end of the piston rod is mounted on the upper part of the bearing box of the upper spindle. The lower fluid pressure cylinder is vertically fixed below the lower spindle with the piston rod facing upward, and a top surface is provided at the upper end of the piston rod with the spindle of the spindle. A support portion formed in an upwardly convex arcuate surface along the direction is fixed, and a flat receiving seat mounted on a lower surface of a bearing box of a lower spindle is mounted on the support portion. 3. The spindle support device of the section steel mill according to 2. 4. The bearing according to claim 1, wherein the upper and lower bearing housings are provided with grease supply ports communicating with the inside of the bearing, and grease is periodically supplied into the bearing. Spindle support device for rolling mill.