JPH0366467A - Method and device for feeding molten metal - Google Patents

Abstract

PURPOSE:To hold a uniform level of molten metal by sending out the condition of the same constitution as the molten metal to the molten metal in a container and melting it. CONSTITUTION:When the molten metal 5 flows out of a pouring port 2 of the container 1 and the level of the molten metal comes under a reference level, a signal of molten metal level down is outputted from a molten metal level detector 10 and inputted into a controller 11. A motor 9 is driven at a fixed speed, and a condition feeder 6 to feed an amount of bar stock 4 usually a little smaller than the rate of outflow of the molten metal outputs a command for acceleration by this input to the motor 9 to feed rather much bar stock 4. When the level of the molten metal rises and arrives at the reference level, the output of the signal of molten metal level down stops and the bar stock 4 is fed again at the fixed speed. Thus, the level of the molten metal can be adjusted by a simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method and apparatus for maintaining the molten metal in a container at a constant level, thereby making it possible to quantify and supply molten metal at a constant rate.

(Conventional technology) In order to improve product quality and productivity, it is necessary to supply molten metal to a die casting machine or continuous casting nozzle, or to a cooling rotating drum in the production of metal fibers and filaments. It is required that the supply amount be constant.

In order to satisfy this requirement, Japanese Patent Application Laid-Open No. 63-295055
As disclosed in Japanese Patent Application Laid-open No. 62-227551, a heat-resistant floating body is partially immersed and floated in molten metal in a container equipped with a pouring port (sump outlet), and the temperature is measured by a level detector. A technique is known in which the floating body is raised and lowered in response to a melt level change signal, thereby making the level of the molten metal in the container constant.

(Problem to be Solved by the Invention) However, the specific gravity of the molten metal (molten metal) is large, and a large buoyancy force acts on the floating body. Furthermore, in order to reduce the upward load caused by this buoyancy, it is necessary to increase the weight. Therefore, in order to quickly raise and lower the floating body in the molten metal, a larger lifting and lowering device is required compared to the control. Furthermore, in order to control the molten metal level, the floating body must be raised and lowered frequently, but as the equipment becomes larger, the response speed decreases, resulting in a decrease in control accuracy and fluctuations in the molten metal supply rate. is likely to occur.

The present invention was made in view of such problems, and an object of the present invention is to provide a molten metal supply method and device that can easily perform highly accurate molten metal level control without increasing the size of the device. shall be.

(Means for Solving the Problems) The molten metal supply method of the present invention, which has been made to achieve the above object, is a method for supplying molten metal into the container from the pouring port of the container while maintaining the molten metal level approximately constant in the container. In the method for supplying molten metal, a strip having substantially the same composition as the molten metal is delivered from the axial direction to the molten metal in the container and melted, and the surface of the molten metal is maintained substantially uniform.

Further, the apparatus of the present invention made to carry out the above method includes: a container that accommodates molten metal and supplies the molten metal from a spout; a molten metal level detector that detects the molten metal level in the container;
The vessel is equipped with a strip supply device that feeds strips of the molten metal and the components from the axial direction into the molten metal in the container, and a heating means for keeping the molten metal warm and melting the strips fed into the molten metal. According to the invention, a control device is attached to the boiler and controls the strip feeding speed of the strip feeding device in order to maintain the hot water level at a constant level by manual input of a low hot water level signal from the hot water level detector. composition. At this time, it is preferable to provide a pouring spout in the upper part of the container, and also provide a tilting means for causing the molten metal in the container to flow out from the pouring spout by tilting the container.

(Function) A strip of almost the same composition as the molten metal is fed into the molten metal in the container from the axial direction and melted, so that the raw metal is reduced in proportion to the amount of decrease in the molten metal in the container caused by being supplied from the pouring port. It is replenished quickly, and the amount of replenishment can be precisely controlled by simply adjusting the strip delivery speed, making it easy to maintain a uniform hot water level. In addition, when replenishing, the buoyancy from the molten metal does not act on the strip at all, so the strip supply device does not need to support the buoyancy from the molten metal that accompanies supply, and only has the function of feeding the strip. The structure is simple and the device can be easily miniaturized.

Furthermore, since the molten metal is directly supplied in the form of strips, the strips are easily melted within the container, and a separate melting furnace for melting supply molten metal is not required.

According to the molten metal supply device of the present invention, the molten metal in the container decreases as follows:
It is detected by detecting the hot water level with a detector. The low water level signal from the detector is input to the control device,
As a result, the strip delivery speed of the strip supply device is adjusted so that the hot water level remains constant.

If the molten metal supply device is provided with a tilting means for tilting the container to allow the molten metal in the container to flow out from the pouring port at the top of the container, it will be possible to prevent the strip material supply device from temporarily stopping or at the end of its operation. However, by performing a tilting operation so as to keep the level of the hot water constant based on the hot water level detection signal, the molten metal in the container can be supplied in a fixed amount, and the molten metal in the container can be used without wasting it.

(Example) First, an example of an apparatus for implementing the molten metal supply method of the present invention will be described with reference to FIG. The apparatus includes a fireproof container 1 for storing molten metal, and a pouring port 2 for flowing out (overflowing) the molten metal is provided in the upper side wall of the container 1. Further, on the outer peripheral surface, a heating means 3 consisting of an induction coil for heating the molten metal 5 in the container is provided.
is attached.

A strip feeder 6 is provided at the top of the container 1 for delivering strips 4 such as rods, wires, strips, etc. to the molten metal 5 in the container. The device 6 is equipped with a pair of left and right pinch rollers 7^, 7B in upper and lower stages, and a variable speed motor 9 is connected via a gear mechanism 8 for rotating the rollers 7A, 7B in mutually opposite directions. There is.

The strip material 4 is a metal material having substantially the same composition as the molten metal 5, and is supplied to the pinch rollers 7A, 7B either as a straight material or unwound from a coil material.

Further, a molten metal level detector 10 is provided above the molten metal 5 in the container. The hot water level detector 10 is not limited to the reflective type illustrated, but may be a contact type. The detector 10 is connected to the pouring port 2
When the hot water level drops below a reference surface located a certain distance from the bottom of the tank, a low hot water level signal is issued.

In addition, the container 1 has an intersection point A between the inner circumferential surface of the container and the bottom surface of the pouring port.
A tilting device (not shown) is provided for tilting the container l about an axis perpendicular to the outflow direction of the molten metal. This device rotates the container 1 using a drive source such as a motor, and is equipped with an appropriate brake device to maintain the tilted state.

Reference numeral 11 denotes a control device, and when the strip material supply device 6 or the zero strip material supply device 6 equipped with a tilting device use selection switch is selected, the strip material supply device 6 is controlled by inputting a hot water level drop signal. A speed increase command is output to the motor 9. On the other hand, when the hot water level drop signal is not input, the speed increase command is not output.
The motor rotates at a constant speed set in advance. On the other hand, when the tilting device is selected, a tilting command and a tilting stop command are output to the drive source (for example, a motor) of the tilting device depending on the presence or absence of the signal. When the tilting stop command is output, the container 1 is held at that position.

Next, the molten metal supply method of the present invention will be explained together with the operation of the above device.

When the molten metal 5 flows out from the pouring spout 2 of the container 1 and the level of the molten metal 5 in the container 1 falls below the reference level, the molten metal level detector 10 outputs a molten metal level drop signal, which is input to the control device 11. In the strip supply device 1'6, the motor 9 is normally driven at a constant speed so as to supply the strip in an amount slightly smaller than the outflow capacity of the molten metal. In response to the input of the hot water level drop signal, a speed increase command is output from the control device 11 to the motor 9, and more strips 4 are supplied. As a result, the hot water level rises and reaches the reference level. Then, the output of the molten metal level lowering signal stops, the strip is supplied again at a constant speed, the molten metal level is maintained at the reference level, and the molten metal continues to flow out at a fixed fixed rate.

When it is desired to stop the strip supply device 6 temporarily or for a long period of time, by selecting the use of the tilting device in the control device 11, it is possible to continue supplying the molten metal in a constant quantity. In this case, a tilting command or a tilting stop command is output depending on the presence or absence of the hot water level drop signal, and the container 1 is intermittently tilted so that the hot water level matches the reference level. As a result, the strip supply device 6 can be temporarily stopped to inspect the device, etc.
Further, when the operation of the molten metal supply device is finished, the molten metal in the container can be effectively utilized. In addition, when restarting the operation of the strip supply device 6 after temporarily stopping the strip supply device 6 and tilting the container 1, it is possible to operate the strip supply device 6 in the tilted position of the container as shown in FIG. be.

In addition, in order to prevent fluctuations in the molten metal level as much as possible when supplying the strips to the molten metal in the container, a partition wall 13 is provided in the container as shown in FIG. All you have to do is supply it. Alternatively, as shown in FIG. 4, the strip 4 may be supplied through a refractory insertion tube 14 with one end immersed in the molten metal.

Further, the pouring port 2 is not limited to the upper part of the side wall of the container 1, but as shown in FIGS. 5 and 6, the pouring ports 2A and 2B may be provided at any position in the lower part of the side wall or in the middle of the side wall.

Further, when the molten metal is intermittently pumped and supplied to a die-casting machine or the like, it is preferable to provide a sump 15 outside the pouring port 2C, as shown in FIG. When supplying molten metal intermittently,
The hot water level is controlled by operating the strip supply device 6 (constant speed delivery),
This is done by stopping (strip material delivery speed = 0). In other words, when the pumping of molten metal is started and a melt level drop signal is input to the control device, the strip material supply device is activated and the strip material is supplied at a constant speed according to the pumping speed, and the pumping is stopped. Once the melt level has returned to the reference level, the supply of strips is stopped.

(Effects of the Invention) As explained above, according to the method and apparatus for supplying molten metal of the present invention, the raw metal strip is delivered to the molten metal in the container in accordance with the drop in the molten metal level, so that the strip is filled with water from the molten metal. There is no buoyancy at all, and the strip supply device only needs to have a feeding function, so a simple device is sufficient. Furthermore, since the level of the hot water is adjusted by adjusting the feeding speed of the strip, the control accuracy is good. Furthermore, the supply of strips not only controls the molten metal level, but also replenishes insufficient molten metal, eliminating the need for a melting furnace to melt the replenishing molten metal, simplifying the equipment. be able to.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an overview of the molten metal supply device according to the embodiment, Fig. 2 is a cross-sectional view showing the tilting state of the device, Fig. 3 is a cross-sectional view of a container equipped with a partition wall, and Fig. 4 is an insert. Cross-sectional views of the container showing the state in which strips are being supplied through the pipe, Figures 5 to 7
The figure shows a cross-sectional view of a container with various inlets. 1... Container, 2, 2^, 2B, 2C... Pouring spout, 3... Heating means, 4... Strip material, 5... Molten metal, 6
... Strip supply device, 10... Hot water level detector, 11...
·Control device. Figure Z Figure 428-

Claims (3)

[Claims] (1) In a method of supplying the molten metal in the container from the pouring port of the container while keeping the level of the molten metal in the container substantially constant, the molten metal in the container is poured from the axial direction of the strip having substantially the same composition as the molten metal. 1. A method for supplying molten metal, which is characterized in that the molten metal is delivered and melted, and the surface of the molten metal is maintained substantially uniform. (2) a container that accommodates molten metal and supplies the molten metal from a spout; a molten metal level detector that detects the molten metal level in the container;
and a strip supply device that feeds a strip having substantially the same composition as the molten metal into the molten metal in the container from the axial direction, and a heating means for keeping the molten metal warm and melting the strip fed into the molten metal is provided in the container. A control device is provided for controlling the strip delivery speed of the strip feeding device in order to maintain the hot water level constant by inputting a hot water level drop signal from the hot water level detector. Molten metal supply device. (3) The molten metal supply device according to claim 2, wherein the pouring spout is provided at the top of the container, and tilting means is provided for causing the molten metal in the container to flow out from the pouring spout by tilting the container.