JPS5915737B2 - Casting roller device in continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casting pull-out roller device in a vertical continuous casting machine that grips and pulls a casting having an outer peripheral surface of a circular cross section that grows in a mold and pulls it downward. It is.

Vertical continuous casting equipment consists of a dummy bar to support the bottom of the casting while it is being formed in the mold, and the upper end of the dummy bar has open upper and lower ends. Insert into the bottom opening of the mold.

As the molten metal begins to solidify in the mold and the casting grows, the dummy bar and the casting are sequentially pulled downward through guide rollers by a pull-out roller device, and after passing through the dummy bar, the casting is cut into a predetermined length and transported away from the casting device. The above-mentioned drawing roller device, in a continuous casting device for round castings, is conventionally composed of a plurality of pairs of driven or freely rotating rollers, and as shown in FIG. The contact with the surface of the casting A is a point contact at point a.
As a result, the casting A, which is to be a product, has a flat surface pressure scratch as shown in FIG. 1 due to the pressing force of the drive roller 61 for applying the pulling force, and the cross-sectional shape is circular. Not. As a countermeasure for this problem, as shown in FIG. Although the above-mentioned press scratches can be prevented from occurring, since the diameter of the circumferential surface of the roller 64 is different between the center and end sides, an error in circumferential speed occurs between the center and end sides. , a slipper is generated between the circumferential surface of the roller 64 and the surface of the casting A.

As a result, abrasion scratches occur on the casting A, and the roller 64 cannot rotate smoothly, and is subject to severe wear, resulting in a shortened lifespan. This invention eliminates such drawbacks, and its purpose is to avoid causing press and scratches on cast products. To provide a pull-out roller device that does not cause the roller to become loose and has good roller durability.

Embodiments of the present invention will be described below with reference to the drawings. First, the basic technology of this invention will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows an example of a rigid continuous casting apparatus, in which 1 is a ladle that supplies molten metal M to a tundish 2, and the tundish 2 discharges molten metal M into a mold 3. It is. The mold 3 has a secondary cooling device 4 at its bottom.
, 5, the cooling device 4 is a spray for spouting cooling water, and the cooling device 5 is equipped with a casting A and a dummy bar (
(not shown) is provided with a number of freely rotating rollers guiding the rollers (not shown).

Furthermore, a swirling sprayer (not shown) may be installed below the cooling device 5, and the outer surface of the casting may be cooled by jetting water from this sprayer.

A casting drawing roller device 7 is provided below the secondary cooling device 5, and this device 7 includes a plurality of pairs of driven or freely rotating rollers 8 that sandwich the casting A, and these rollers 8 are connected to a housing 9. is supported by

These housings 9 are tightened from both sides of the outer circumferential surface of the casting or dummy bar through rollers 8 using a pressing device (not shown) as a power source, and the rotational driving force of the roller 8 moves the casting or dummy bar in the axial direction. It is meant to be transported.
Then, the pull-out roller device 7 removes the dummy bar B. Moreover, the dummy bar is not used to pull out the casting A from the mold 3, but is used to introduce a dummy bar into the mold 3 before the molten metal M starts flowing out. The casting A conveyed by the drawing roller device 7 is cut by the blowpipe cutter 10.
Or cut it to a specified length with a saw cutter, etc.? During this cutting process, the lower end of the casting A is fixedly supported by the clamp device 11. The casting A cut by the cutter 10 is received by the horizontal overturning device 12, carried into the drive table roll 13, and carried out from the casting device. FIG. 2 is an enlarged view of the pull-out roller device 7. The drive shaft 14 of the roller 8 is rotatably supported by a bearing 15 fixed to the housing 7 (FIG. 1) via a bush 16. It is connected to a motor 20 via a coupling ring 17, a reducer 18, and a coupling ring 19.

The speed reducer 18 and the motor 20 are fixed to the housing 7. Is the rotation axis of the roller 8, that is, the axial center of the drive shaft 14, set in a direction perpendicular to the axis of the casting A? The outer circumferential surface of the mouth roller 8 is formed into a drum shape with an arcuate surface 21 along the circular outer circumferential surface of the casting A. The roller 8 is divided into a plurality of parts in the direction of the rotation axis, and consists of a small drive roller 22 in the center and free rotation small rollers 23 (23a to 23c) on both sides. The rotating small roller 23 is a bush 24 (24a to 24c)
It is rotatably attached to the drive shaft 14 via. To explain the operation of the above structure, the casting A is held in a pressed state by the rollers 8, and a pulling force is applied to the casting A by the small driving roller 22 at the center. At this time, each free-rotating small roller 23 comes into contact with the casting A and rotates at an angular velocity at which the average circumferential speed of each part of the outer circumferential surface matches the transport speed of the casting A. By the way, roller 8 is cast A.
It is formed into an hourglass shape with a circular arc surface 21 along the circular outer circumferential surface of the casting A, and since it is in line contact with the outer circumferential surface of the casting A, the pressing force of the roller 8 for applying a pulling force forces the casting A. No pressure scratches occur on A, and therefore the circular outer circumferential surface of cast A is not deformed.

Further, although each of the small rollers 22 and 23 has a circumferential speed error between the center and the end of the outer peripheral surface thereof, each of the small rollers 22 and 23 rotates independently, and the small roller 22 , 23 is also small (as in the case where the roller 8 is formed as a single piece), the circumferential speed error is smaller than in that case, and the sliding gap with the casting A is small. The occurrence of scratches on plate casting A with less scratches is suppressed.

At the same time, the roller 8 is less prone to wear, improving durability and allowing the roller 8 to rotate more smoothly. however,
Even with the above configuration, since there is a slight difference in circumferential speed between the small rollers 23a to 23c, some amount of scratches cannot be avoided. Therefore, the present invention completely prevents the occurrence of the scratches by interposing a belt between the roller and the casting, and an example thereof will be described below.
3 to 5 show embodiments of the present invention, A is a casting, 25 is a drive roller, 26 is a steel belt, 27
8 is a driven roller, and the pressing roll 28 is a guide roller.

As shown in FIG. 4, the drive roller 25 is connected to the housing 7.
The roller 25 is supported by a bearing 29 fixed to the roller 25 (FIG. 1), and is driven by a motor 33 via a coupling 30, a reduction gear 31, and a coupling 32. The toes 25, 27 to 33 constitute a driving device for the belt 26. As shown in FIG. 5, the pressing roller 8 is formed into a drum shape with an arcuate surface 21 similar to the roller 8 in FIG. 2, and is divided into multiple parts in the direction of the rotation axis. Each of the small rollers 34 is rotatably mounted on a support shaft 35 fixed to the housing 7 via a bush 36. According to such a configuration, the belt 26 is pulled and driven by the driving roller 25, and the pressing roller 8 is applied to the casting A via the belt 26.
A pulling force is applied to the casting A by being pressed against it.

Here, since the roller 8 is formed in the shape of a circular arc surface 21 along the circular outer circumferential surface of the casting A, the pressing force of the roller 8 does not cause pressure scratches on the casting A. Moreover, roller 8
Since the small rollers 34 are in contact with the casting A through the belt 26, the circumferential speed error of each small roller 34 does not affect the casting A, and no scratches are caused on the casting A. On the other hand, although there is slippage between the belt 26 and each of the small rollers 34 due to circumferential speed errors of the small rollers 34, the slippage is slight compared to when the roller 8 is formed as a single roller. As a result of this resistance, the roller 8 is less likely to wear out, and the rotation of the roller 8 becomes smooth.

As described in detail above, this invention forms the outer circumferential surface of the roller into a drum shape with an arcuate surface that follows the circular outer circumferential surface of the casting, and divides this roller into a plurality of parts in the axial direction, each of which has a small roller. are rotatably attached to the support shaft independently from each other, and the rollers are pressed against the casting through the belt, so the casting only contacts the belt and not the roller, so there are no scratches caused by the small rollers. Not only does this not occur in the casting, but the circumferential speed error between each small roller is small, so there is less slippage between each small roller and the belt, which reduces wear on the rollers and improves durability. There are advantages such as

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an example of a continuous casting apparatus using a drawing roller device according to the present invention, Fig. 2 is a sectional view showing the basic technology of this invention, and Fig. 3 is an embodiment of the present invention. A schematic diagram showing an example, FIG. 4 is a plan view of the drive unit of the same example,
FIG. 5 is a sectional view showing the roller of the same embodiment, FIG. 6 is a plan view of a conventional roller device, FIG. 7 is a cross-sectional view of a casting manufactured using the same device, and FIG. 8 is a conventional roller device. FIG. 3 is a plan view of a roller device with an improved device. 3... Mold, 7... Pulling roller device, 8...
Mouth roller, 21... Arc surface, 34... Small roller, 35
... Support shaft, A... Casting.

Claims (1)

[Claims] 1. A device for pulling out a casting having a circular cross-sectional outer circumferential surface, which is grown and formed in a mold, while being held by rollers rotating on a support shaft disposed below the mold and perpendicular to the axis of the casting, The outer circumferential surface of the roller is formed into an hourglass shape with an arcuate surface that follows the outer circumferential surface of the casting, and this hourglass-shaped roller is divided into a plurality of small rollers in the direction of the support shaft, and each of the divided small rollers is A casting pulling roller device for a continuous casting apparatus, characterized in that rollers are rotatably mounted on the support shaft in a mutually independent state, and the rollers are pressed against the casting via a belt driven by a drive device.