JPH0456706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pinch roll process in continuous casting equipment, particularly to a roll segment used near the solidified end of a slab.

Prior Art For example, the roll segment in conventional continuous casting equipment is shown in Japanese Patent Application No. 53-5364.
As shown in the figure, in the case of general continuous casting, the slab 1 is continuously cast between the lower roll 3 on the upper surface of the lower frame 2 and the upper roll 5 on the lower surface of the upper frame 4. The slab 1 is attached to the upper frame 4 by the clamp cylinder 7 at the upper end of the side frame 6.
The bulging force + push-in force is applied and the push-in force and the weight of the upper frame 4 and the upper roll 5 are supported by the ram cylinder 9 on the lower frame 2 via the spacer rod 8. Also, if slab 1 is near the unsolidified end (during light reduction)
When the bulging force of the slab 1 decreases, the load applied to the ram cylinder 9 increases and becomes larger than the set load of the ram cylinder 9, causing the ram cylinder 9 to lower the upper roll frame 4, reducing the roll interval and causing bulging. The force was increased again and the slab 1 was properly supported.

Problems to be Solved by the Invention According to the conventional configuration described above, when a hydraulic trouble such as damage to a hydraulic hose occurs, the clamp cylinder 7 is released from the pressure on the slab 1 by the upper frame 4 and the upper roll 5. There was a risk that the distance between the upper roll 5 and the lower roll 3 could no longer be maintained, making immediate continuous casting impossible and making it impossible to deal with the problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roll segment for continuous casting equipment that can maintain the distance between the upper and lower rolls even if hydraulic trouble occurs, and can deal with hydraulic trouble.

Means for Solving the Problems In order to solve the above problems, we focus on a mechanical jack, which supports an upper roll frame having an upper roll provided opposite a lower roll frame having a lower roll, and A hydraulic cylinder that presses the upper roll frame under light pressure is provided on the roll segment frame, and during general casting, the upper roll frame is held against the bulging force of the slab and the reaction force of the pushing force, and the hydraulic cylinder presses the upper roll frame under light pressure. The roll segment frame is provided with a mechanical jack that operates to follow the push-in during rolling and maintains the upper roll frame.

Effect Due to the above configuration, during general continuous casting, the machine jack presets the upper and lower roll spacing and performs casting, and the machine jack holds the reaction force of the bulging force and pushing force from the slab through the upper roll frame. However, during light reduction, the upper roll frame is pushed in by the hydraulic cylinder and at the same time the machine jack is operated to maintain the upper roll frame during casting.This prevents the hydraulic system from malfunctioning, such as damage to the hydraulic hose. Even if this occurs and the hydraulic pressure of the hydraulic cylinder etc. cannot be maintained, the distance between the upper and lower rolls is maintained by a mechanical jack, so the distance will not widen and make casting impossible. In addition, when pushing in the slab, the machine jack is not used to push it directly, but is pushed in using a hydraulic cylinder and the machine jack follows, so damage to the machine jack can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1 is a partially cutaway front view showing one embodiment, FIG. 2 is a partially cutaway side view, FIG. 3 is a plan view, and FIG. 4 is a detailed sectional view of the mechanical jack.

The roll segment 11 of the present invention is applied to the continuous casting equipment 12, particularly in the light reduction area A, as shown in FIG. It can also be applied to a vertical type.

Here, the light reduction state will be explained. Generally, in the pinch roll process, a predetermined pressing force is applied to the pinch rolls against the combined force of the pushing force to form the slab to a predetermined thickness and the expansion force (bulging force) of the slab. . However, at the end of the pinch roll process, the expansion force of the slab is relaxed, so if the above-mentioned predetermined pressing force is similarly applied to the pinch rolls, cracks will occur in the slab, so it is necessary to reduce the pressing force. and add it to the pinch roll. This condition is called light pressure.

In FIGS. 1 to 4, 13 is a roll segment frame, which includes a rectangular lower frame 13A, four guide frames 13B erected at the four corners of the lower frame 13A, and an upper end of the guide frame 13B opposed to the lower frame 13A. Upper frame 13 provided
It consists of C. 14 is a lower roll frame having a lower roll 15 on the upper surface, and the lower frame 13
It is supported by four lower machine jacks 16 provided at A and the four guide frames 13
It is arranged so that it can be raised and lowered while being guided by a lower guide 17A provided at B. Reference numeral 18 denotes an upper roll frame having an upper roll 19 on the lower surface, which is provided opposite to the lower roll 15. The upper roll frame 18 is supported by four hydraulic cylinders 20 provided on the upper frame 13C, and is connected to the lower roll frame 14. Similarly, the upper guide 1 provided on the guide frame 13B
It is arranged so that it can be raised and lowered while being guided by 7B. The lower roll 15 and the upper roll 19 constitute one roll with a short roll and a long roll, for example, as shown in FIG.
Seven pairs of rolls are provided, with the upper roll 19 and the upper roll 19 facing each other. A slab 21 is continuously cast between the upper and lower rolls 15 and 19, and has an unsolidified portion 21A inside thereof during general casting. The arrow indicates slab 21
is the direction of movement. The hydraulic cylinder 20 is attached to a cylinder support portion 22 provided on the upper surface of the upper frame 13C via a pin 23 so as to be swingable only in the front-back direction, and a cylinder stem 24 is provided within the upper roll frame 18. The upper roll frame 18 is fitted into the pin 25 to support the upper roll frame 18 and press the upper roll frame 18 downward under light pressure.

26 is an upper machine jack provided on the upper frame 13C, and is used to control the upper roll 19 and the lower roll 1 before casting.
5 (thickness of the slab) is set in advance with this upper machine jack 26, and the upper machine jack 26 is used to counteract the reaction force of the bulging force and pushing force of the slab 21 that is applied to this upper machine jack 26 during general casting. Holds the roll frame 18. Also, this upper machine jack 2
When the upper roll frame 18 is pushed in by the hydraulic cylinder 20 during light rolling, the upper roll frame 6 expands and contracts to maintain the upper roll frame 18. The lower end surface of the jack rod 27 of the upper machine jack 26 that holds the upper roll frame 18 is formed into a spherical surface to allow the upper roll frame 18 to swing. A receiving seat 28 is provided on the upper surface of the upper roll frame 18, with which the lower end of the jack rod 27 comes into contact.

In the upper mechanical jack 26, a worm wheel 31 rotatably supported on a jack frame 30 is rotated by a worm gear 29 which is rotatably driven by a servo motor (not shown), and an internal drive is made to the worm wheel 31 via a key 32. The fitted inner cylinder part 33 is rotated, and the male thread part 27a at the upper end of the jack rod 27, which is threadedly engaged with the female thread part 33a of the inner cylinder part 33, is moved up and down to open the mechanical jack 26.
It operates. Upper machine jack 26
A load cell 34 for detecting the load held by the upper mechanical jack 26 is provided in the middle of the jack rod 27. Further, this upper machine jack 26 includes upper machine jacks 26a and 26b or 26 on both sides of the roll segment 11 in the width direction.
In order to interlock c and 26d, for example, gear device 3
A known interlocking device 37 consisting of a connecting rod 36 and a connecting rod 36 is provided.

Next, the operation of this roll segment 11 will be explained. During general casting, the distance between the upper roll 19 and the lower roll 15, that is, the slab thickness B, is preset by the upper machine jack 26, and casting is started. The bulging force of the slab 21 moving between the rolls and the reaction force of the pushing force of the rolls are held by the upper machine jack 26 via the upper roll 19 and the upper roll frame 18, and the abnormal load from the slab is also held by the upper machine jack 26. It is supported by mechanical jacks 26. At this time, the hydraulic cylinder 20 is connected to the upper roller 19 and the upper roll frame 1.
It is set to hold only the dead weight of 8.

During light rolling down, when the load cell 34 installed on the jack rod 27 detects a decrease in the bulging force of the slab 21, the hydraulic cylinder 20 pushes the upper roll frame 18 with a force slightly larger than the bulging force + pushing force during light rolling down. , when the load cell 34 detects that the load is no longer applied to the jack rod 27, the upper machine jack 26
is operated to follow the pushing of the upper roll frame 18 by the hydraulic cylinder 20. When the pushing of the upper roll frame 18 balances with the reaction force of the slab 21 and stops, the hydraulic cylinder 20 returns to the original state of holding the own weight of the upper roll 19 and the upper roll frame 18, and the pushed upper roll Frame 18 is held by upper mechanical jacks 26.

The above operation is performed by the upper mechanical cylinder 26 and the hydraulic cylinder 20 working as a pair, and the upper mechanical cylinders 26 on both sides of the slab 21 are interlocked by the interlocking device 37, so that, for example, the end portion of the unsolidified slab 21a of the slab 21 is moved into the roll segment 11. 5, the upper and lower rolls 19, 15 form tapered surfaces that are inclined forward and backward. In this embodiment, it has been explained that a hydraulic cylinder and a mechanical jack that work together are provided on the upper frame side, but they can be similarly provided on the lower frame side to enable light pressure reduction from both sides.

Effects of the Invention As described above, according to the present invention, even if a hydraulic trouble occurs, the upper roll frame is held by the mechanical jack, so the pressure on the slab of the roll will not be released. Also, since the slab is not directly pushed in by the mechanical jack during light reduction, it follows the pushing in by the hydraulic cylinder.
Even if abnormal pressure occurs during pushing, it is absorbed by the hydraulic cylinder, so damage caused by pushing the machine jack can be prevented. In addition, in the conventional case, the seventh
As shown in the figure, the deflection of the upper frame 4 tends to increase due to the pressure exerted by the cylinder 7, but according to the present invention, the deflection can be reduced to a minimum value.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a side sectional view of a mechanical cylinder. FIG. 5 is a schematic explanatory diagram of its operation, FIG. 6 is a schematic diagram of a continuous casting line, and FIG. 7 is a schematic front view showing a conventional example. 11...Roll segment, 13...Roll segment frame, 14...Lower roll frame,
15...lower roll, 18...upper roll frame,
19...Top roll, 20...Hydraulic cylinder, 21
... Slab, 26 ... Upper machine jack.

Claims (1)

[Claims] 1. A hydraulic cylinder is provided on the roll segment frame to support an upper roll frame having an upper roll provided opposite to a lower roll frame having a lower roll, and to push the upper roll frame during light rolling, so that the cast slab is removed during general casting. The mechanical jack is configured to hold the upper roll frame against the reaction force of the bulging force and the pushing force, and to operate in accordance with the pushing of the hydraulic cylinder during light pressure reduction to maintain the holding of the upper roll frame. A roll segment in continuous casting equipment characterized by being provided in a roll segment frame.