JPS6056449A - Method for maintaining constant flow rate for supplying liquid to vessel or the like - Google Patents

Abstract

PURPOSE:To maintain a constant flow rate for supplying a liquid to a vessel on a receiving side, etc. with a relatively simple device by interposing a mechanism for regulating outflow rate provided with an automatic balancing function for which a dynamical balancing relation is applied between a vessel on a supply side and the vessel on the receiving side, etc. CONSTITUTION:A liquid tank (intermediate tank) 3 having such a balancing function which maintains the constant flow rate for supplying the liquid from a liquid supply vessel (e.g., a ladle) 1 for a molten metal, etc. to a vessel (e.g.; a tundish) 2 on a receiving side of the liquid even if said flow rate fluctuates is installed between the vessel 1 and the vessel 2. The tank 3 is provided with an overflow port 32 provided with a gate 31 on one side and is supported freely oscillatably around the oscillation axis center 33 on the port 32 side. The gate bottom is formed to an arc shape around the center 33 so that the height of the gate bottom is maintained always constant when the tank 3 itself turns around the center 33. Namely, even if the liquid is supplied at an inconstant flow rate from the vessel 1, the level of the free surface of the liquid is made constant from the balance of the moment around the center 33 and the outflow rate of the liquid from the port 32 is consequently made constant, by which the flow rate of the liquid to be admitted into the vessel 2 is made constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for injecting molten metal to a tundish at a constant flow rate from a nozzle via a full guide pipe for supplying molten metal to a tundish. This invention relates to a method of constantizing the supply flow rate of.

(Prior Art) As one of the above-mentioned apparatuses, there is an apparatus for manufacturing thin metal ribbon using a high-speed quenching method. In the production of quenched ribbon metal, it is necessary to keep the flow rate of the molten metal injected from the nozzle constant in order to keep the thickness of the product constant throughout and to obtain a uniform cooling effect.

Conventionally, in order to maintain a constant injection flow rate from a nozzle, a molten metal level detector in the tundish is used to maintain the effective head pressure applied to the nozzle at a constant level. Based on the results, a method was used to adjust the flow rate of molten metal from the ladle.

However, in the process of processing high-temperature, high-density molten metal, it is generally difficult to ensure the accuracy and durability of the level detector and to finely adjust the flow rate from the ladle, resulting in fluctuations in effective head pressure. Fluctuations in the injection flow rate from the nozzle due to this were unavoidable.

(Object of the Invention) In view of the above, the present invention provides a method for making constant the flow rate of liquid supplied to a container, etc., when supplying liquid to a container, etc., which is limited to the above-mentioned devices. The purpose is to provide

(Construction and Effect of the Invention) The method of the present invention for achieving all of the above objects supplies a liquid tank which has a bath outlet on one side and is swingably supported around the effective area of the bath outlet as a swinging fulcrum. It is installed between the side container and the receiving side container, etc., and while the liquid tank receives the liquid from the supply side container, the liquid tank is oscillated by the liquid tank total balance mechanism according to fluctuations in the receiving flow rate, and the bath outlet is This is a method for making constant the flow rate of liquid supplied to a container or the like on the receiving side while keeping the total amount of light emitted from the liquid bath constant.

The present invention will be explained in detail below.

FIG. 1 is a diagram showing an example of the basic configuration of an apparatus for implementing the present invention. In the figure, 1 is a container (hereinafter referred to as a ladle for convenience) that supplies all of the liquid such as molten metal, and 2
is a container or the like (hereinafter referred to as a tundish for convenience) to which liquid is supplied. Conventionally, in order to inject the liquid in the tundish 2 at a constant flow rate from a nozzle (not shown) via the guide pipe 21, a sliding nozzle of the ladle l, for example, has been used to maintain a constant level of the liquid in the tundish 2. However, in the present invention, the liquid is supplied from the ladle 1 between the ladle 1 and the tundish 2. Even if the flow rate fluctuates, Tanditshu2
A liquid tank 3 (hereinafter referred to as a total intermediate tank) having an equilibrium function so that the flow rate supplied to the tank is constant is installed.

As shown in FIG. 1 and FIG. 2 (al, (bl) showing the detailed structure of part A in FIG. It is supported by a support device (not shown) so as to be able to swing freely about a swing axis 33 on the bath outlet side.The weir 31 is a triangular weir (Fig.
), the shape of the weir is arbitrary, such as a square weir, but the height position of the increased area is always constant when the intermediate tank 3 itself rotates around the pivot axis 33. The increased area is the oscillation axis center 3
Form into a circular arc surface centered on 3. By doing so, the effective weir function remains constant even if the intermediate tank 3 swings around the swing axis 33.

The side opposite to the bath outlet side is supported by a lever 34 and a spring member 35 for providing a moment balance that balances the rotational moment of the intermediate tank 3 about the swing axis. In addition, 36
is a damper, which is provided to completely remove high frequency vibration components when the intermediate tank 3 swings.

The position of the swing axis 33 is near the effective bottom of the R31, and the planar shape is such that the area of the free surface of the liquid in the intermediate tank 3 is constant regardless of the swing angle of the intermediate tank. For example, assume a trapezoid, and the short side of this trapezoid is the pivot axis 33.
If it is made to match, the increase or decrease of the liquid in the intermediate tank will be proportional to the swing angle of the intermediate tank around the swing axis 33, and it will be easy to provide the balanced moment as described above. . In addition, the part that receives the liquid from the ladle machine is located at the center of the swing axis 3.
3, and at a side that does not completely obstruct the flow of liquid at the bath outlet 32, the generation of a disturbance moment can be avoided.

According to the device configured as described above, even if liquid is supplied from the ladle 1 by the irregular flow meter, the level of the free surface of the liquid is constant due to the balance of moments around the swing axis 33, which will be described later, and as a result, the level of the free surface of the liquid is constant. Since the effective head relative to bath 31 can be kept constant, the amount of liquid flowing out from bath outlet 32 is constant, and the flow rate of liquid flowing into tundish 2 can always be constant.

FIG. 3 is a diagram for explaining the balance of moments around the swing axis 33 in the device configuration of FIG. 1.

In the figure, point O corresponds to the pivot axis 33 of the intermediate tank 3. Point 02 is an axis that is vertically above the swing axis 33 and parallel to the swing axis 33, and is at the same height as the upper surface of the liquid in the intermediate tank 3. The arcs A and A2 correspond to the wall surface facing the bath outlet 32 of the intermediate tank 3. First, the liquid level is 0. When A was in the horizontal direction, the amount of liquid flowing in from the ladle 1 increases and the amount of liquid in the intermediate tank 3 increases, and the intermediate tank 3 rotates to a new liquid level of 0.
It shall be 2A2. Also OA.

= 100 lives = R, angle A, OA2 as Δθ, oo, = o
o2° angle A, 00. = Angle A2002” (Z
, L/ /(34 effective length - kl, the initial liquid weight when the liquid surface intoxication Σ is horizontal is W, and the position of the center of gravity at that time G or the distance from the point O is 0^7) Assume that the point is at an angle θ, and the moment around point O is also in equilibrium.

Under the above conditions, when the moments around the point O are balanced, the following formula %)) ) (1) where γ: Specific weight of the liquid A: Area of the liquid surface; A spring constant is established.

Here, the change angle Δθ of the liquid level 4G can be made sufficiently small by increasing the planar area of the intermediate tank 3, so if we rearrange the above equation (1) so that 5IIIΔθ Δθ holds true, , ■ (W-L-008(θ+α)-tγ ・As-R3m5
For inα, (R+7i)2)・Δθ≠0 (2).

The above ((
2) In order to hold the formula, W・LIIC31+(θ
10α) 10γ@Am-R3@sinα-(R+A)2
=0 (3) Therefore, (4) The spring constant of the spring tool 35 in FIG. 1 may be set so that the following equation is satisfied. Here, R in the right side of equation (4) above
, 1, and A are determined by the dimensions of the intermediate tank 3, γ is determined by the liquid to be treated, and W, L, θ, and α are determined by the dimensions of the intermediate tank 3 and the specific weight r of the liquid, so the spring constant is ( 4) It can be determined using Eq. As described above, in order to reduce the angle of change Δθ of the liquid level, it is effective to increase the depth Rf of the intermediate tank 3 to increase the area A of the liquid level.

As mentioned above, in the device configuration shown in FIG.
By determining the spring constant of , even if the amount of liquid flowing in from the ladle 1 fluctuates, the intermediate tank 3 will swing as the entire fulcrum of the swing axis 33 in accordance with the fluctuation, and the liquid level of the intermediate tank 3 will be Since the liquid is always maintained horizontally at a constant height, the flow rate of the liquid that completely overflows the weir 31 of the intermediate tank 3 and is supplied to the mendices 2 can be kept constant at all times.

The device configuration shown in FIG. 1 shows one embodiment of the present invention, and the shape of the intermediate tank and the structure of the balance mechanism (for example, levers, springs, bolts, etc.) are based on the concept of the present invention. It goes without saying that various modifications can be made without departing from the scope, and the field of application of the present invention is not limited to the molten metal treatment process illustrated, but can be applied to general treatment processes for the purpose of quantitatively supplying liquids. It is possible.

(Effects of the Invention) As described above, the method of the present invention provides an outflow adjustment mechanism equipped with an automatic balance function 1 applying a dynamic balance relationship, by interposing the outflow amount adjustment mechanism between the supply side container and the receiving side container, etc. This has an excellent practical effect in that the flow rate of liquid supplied to the receiving side container etc. can be made constant using a relatively simple device.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the basic configuration of an apparatus for carrying out the present invention, and Fig. 2 (al and fbl are partially enlarged views (front view and side view) of the intermediate tank in Fig. 1). 3 is a diagram for explaining the moment balance in the device configuration shown in FIG. 1. 1... Ladle, 2... Tundish, 3... Intermediate tank, 11... Sliding nozzle, 21... Guide pipe, 31... Weir, 32... Bath outlet, 33... Swing axis, 34... Lever, 35... Hanging tool, 36
...Damper, 37 medium bearing. Agent: Patent Attorney Tomoyuki Yafuki, 1st Age, 21st Prisoner (g) Figure 3 Procedural Amendment (Voluntary) October 1981, Japan Patent Office Commissioner Kazuo Wakasugi, 1, Indication of Iku, 1988 Patent Application No. 16422
No. 0 No. 2, Name of the invention Method for stabilizing the flow rate of liquid supply to containers, etc. 3 Relationship with the case of the person making the amendment Applicant address (residence) 2-6-3 E, Otemachi, Chiyoda-ku, Tokyo s <5s) (665) Nippon Steel Corporation 4, Agent Address: 704, 6-4-21 Akasaka, Minato-ku, Tokyo Telephone:
584) 7022 5. Detailed description of the invention and drawings in the specification subject to amendment (1) The formula on page 7, lines 10 to 13 of the specification is corrected as follows. "WIIL(sIn(θ+α+Δθ)-sin(θ"-
α)) Δθ One・(R+A)・Δ0・(B+l)=.・・・・・・・・・・・・(1)'' (2) Figure 3 of the attached drawings is corrected as shown in the attached sheet.

Claims (1)

[Claims] A liquid tank having a bath outlet on one side and swingably supported as a full swing fulcrum near the effective bottom of the bath outlet is installed between the supply side container and the receiving side container, etc. While receiving all the liquid from the supply side container, the liquid tank is oscillated by a balance mechanism according to fluctuations in the received flow rate, and the liquid supply flow rate from the bath outlet is kept constant and supplied to the receiving side container, etc. A method of constantizing the flow rate of liquid supplied to containers, etc.