CN1872457A - Immersion type protector of down spout for the pouring basket in continuous casting system - Google Patents

Abstract

A submerged sprue protector of tundish in steel conticasting system is composed of a tundish with submerged sprue, a balancing spring kit on a carrier for supporting tundish, and a tundish filting actuator.

Description

Consecutive Casting Steel Systematic Pouring Basket Immerge Type Weir Protector

Technical field

The present invention relates to the improvement of the middle hired car of continuous casting system.

Technical background

Continuous casting technique comprises molten steel from the facility of tundish through submersed nozzle inflow crystallizer, and the mouth of a river is immersed in the following a certain degree of depth of crystallizer meniscus.Because continuous casting technique requires the crystallizer liquid steel level highly stable, under the constant situation of tundish height, can be gone out a slag line by the liquid slag layer etch at the interface what submersed nozzle stretched to molten steel and covering slag.In order to prolong the service life at the mouth of a river, need to change the height of tundish, will be expanded as one section by the face of etch by the slag line of etch.Usually back stall is on the actuator of the driving tundish lifting on the hired car of centre in the middle of, and its shortcoming is that the actuator power demand is bigger, often regulates immersion depth with the way of crawl ladder lifting, influences the protection effect of submersed nozzle.

Summary of the invention

The purpose of this invention is to provide a kind of protective device that reduces the actuator power of driving tundish lifting and effectively prolong the service life of submersed nozzle.

The object of the present invention is achieved like this, on the balancing spring external member of the middle back stall support tundish on the hired car of centre on the throne.

The tundish that the rated capacity molten steel is housed to the decrement of spring external member much larger than the desired tundish range of protection submersed nozzle.

The hired car lowering or hoisting gear directly drives tens tons the tundish that molten steel is housed in the middle of existing with actuator, needs powerful actuator.When the centre wraps in casting position when needing periodic lifting with the protection long nozzle, all use crawl ladder up-down mode, uneven by one section submersed nozzle of slag line etch, influence the protection effect of submersed nozzle.

The present invention with middle back stall on the balancing spring external member; make the suffered gravity W of tundish that contains the rated capacity molten steel reach balance with the thrust F that the spring external member that is reached balance by the tundish compression makes progress; and make long nozzle at this moment extend into the mid point that the degree of depth in the crystallizer molten steel is in adjustable range, then immerse the molten steel degree of depth and be with the thrust that reaches the required actuator of submersed nozzle protection purpose or the mean value F of pulling force for regulating submersed nozzle:

$\stackrel{\&OverBar;}{F}=\frac{\mathrm{<figure-callout\; id="4"\; label="WS"\; filenames="A20061000550900061.png"\; state="\{\{state\}\}">WS</figure-callout>}}{4\mathrm{\&delta;}}$

S is the adjustable range of mouth of a river immersion depth in the formula, and δ is subjected to the balance decrement of gravity W effect for the spring external member.

Usually the adjustable range S of mouth of a river immersion depth is about 60mm, and the balance decrement δ of spring external member is about 600mm, thereby the balanced action of the spring external member power that will make actuator be used to protect the mouth of a river to export about 1/40th when being reduced to no spring external member.The actuator low power run helps realizing periodically at the uniform velocity lifting of tundish, makes submersed nozzle by the surfacing of etch, thereby can prolong life cycle, has improved the protection effect of submersed nozzle, has also saved the energy.

Japan Patent (publication No. 1148447) is though used spring to make buffer unit in the device of adjusting tundish liquid level, but buffer spring only supports the weight of tundish 20%, the buffering actuator still supports the weight of tundish 80%, and the actuator that is used for the tundish lifting will support the total weight of tundish, power is bigger, and system complex.

Description of drawings

The present invention as shown in Figure 1.

Fig. 1 is the Consecutive Casting Steel Systematic Pouring Basket Immerge Type Weir Protector schematic diagram.

The specific embodiment

Embodiments of the invention as shown in Figure 1.Tundish vehicle carriage (1) relies on roller (2) to go up walking at track (3) among the figure.Balancing spring external member (4) and hydraulic cylinder actuator (5) are installed on the tundish vehicle carriage (1).Tundish (6) seat is gone up by spring external member (4) at centre hired car crossbeam (1a) and is supported, and the tundish (6) that rated capacity molten steel (7) are housed reaches the balance height Ho shown in the figure (end of tundish (6) is to the distance of guide rail (3) upper surface) with spring external member (4) compression δ length.Hydraulic cylinder (5) is regulated the height of tundish (6), and its adjustable range is that stroke is R.Molten steel (7) in the tundish (6) is injected in the crystallizer (9) by submersed nozzle (8), and submersed nozzle (8) extend into the interior a certain distance of molten steel (10) of crystallizer (9).The liquid slag layer at the interface place of molten steel (10) and the covering slag (11) on it has erosion to submersed nozzle (8).In order to prolong the service life of submersed nozzle (8), need mouth of a river immersion depth to be regulated with hydraulic cylinder (5), adjustable range is S.In the present embodiment, the drift of spring external member (4) is 1040mm, the weight of tundish (6) and crossbeam (1a) is 19 tons, the degree of compression to spring external member (4) is 266mm, it is 40 tons that the tundish (6) of rated capacity molten steel and the weight of crossbeam (1a) are housed, and is 560mm to the decrement of spring external member (4).For the protection the desired tundish of submersed nozzle (8) (6) height adjustment range S be 60mm; The balance height Ho that the tundish (6) of rated capacity molten steel (10) is housed is slightly larger than Hmin+S, and wherein Hmin is a tundish stroke lower limit height.Like this; protection submersed nozzle (8) and regulate the thrust output of the required hydraulic cylinder of height (5) of tundish (6) or the mean value of pulling force only is 1.1 tons; be 1/36th of the weight of tundish (6) that rated capacity molten steel (10) are housed; easily realize periodically at the uniform velocity lifting of tundish (6), improved the service life of submersed nozzle (8).The scope of tundish lifting, cycle and frequency are controlled by controller (12).(1b) is guider among the figure, and (13) are movable motor.

In each casting latter stage of watering time last Baogang's water, the weight of tundish (6) that small amount of molten steel is housed is near 19 tons, and the pulling force of hydraulic cylinder (5) output at this moment is increased to 21 tons, but very short during this period of time, energy consumption is limited.

Be arranged in transport process on the tundish vehicle carriage (1) at tundish (6), tundish (6) is locked in setting height, hydraulic cylinder (5) is in off working state.

Claims (2)

1, a kind of tundish immersion type protector of down spout of continuous casting system; it is made up of the tundish that contains submersed nozzle, middle hired car and the actuator etc. that drives the tundish lifting; it is characterized in that, on the balancing spring external member of the support tundish in the middle of tundish is positioned on the hired car.

2, device as claimed in claim 1 is characterized in that, the tundish that the rated capacity molten steel is housed to the decrement of balancing spring external member much larger than the desired tundish range of protection submersed nozzle.

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