JPS5813265B2 - Automatic pouring control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic pouring control method for quantitatively supplying molten metal (hereinafter referred to as molten metal).

Previously, pouring into the mold was done by tilting the container holding the molten metal, but errors in pouring due to errors in the amount of tilting became significant, making it difficult to expect accurate quantitative supply. .

For this reason, in recent years, quantitative supply has come to be based on electromagnetic conveyance and conveyance means that use molten metal as a secondary conductor to generate thrust.

However, in the quantitative supply of molten metal using this electromagnetic conveying means, even if accurate quantitative supply can be obtained by electromagnetic force control,
Depending on the change in the molten metal level in the container, a time lag occurs between the pouring command signal and the actual start of pouring, which hinders continuous automatic pouring.

■In particular, the temperature of the molten metal decreases during the process of ascending the path of the electromagnetic conveyance device where the molten metal level is low.

In order to improve the yield of molten metal, the electromagnetic transfer device is extended to the bottom of the container, which has various drawbacks such as the difficulty of joining the container and the electromagnetic transfer device.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional method by controlling the position of the electromagnetic conveying device that always reaches a constant level with a means for tilting the pouring device, and to control the level of the molten metal in the container. To provide an automatic molten metal pouring control device that does not cause a time difference in starting molten metal pouring, does not cause a drop in temperature of molten metal, and can easily connect an electromagnetic conveying device and a container.

Hereinafter, the configuration for carrying out the illustrated method invention will be specifically explained.

In the figure, 1 is a container for storing molten metal.

Reference numeral 2 denotes an electromagnetic conveying device, which is composed of a fireproof wall 2a for guiding molten metal extending obliquely upward from the bottom of the container 1, and a moving magnetic field generating device 2b.

Reference numeral 3 denotes a pouring refractory wall, which is connected to the tip of the molten metal guiding refractory wall 2a and enables accurate pouring of the molten metal into the mold.

Reference numeral 4 denotes a pouring device mounting base, and one end of a hydraulic cylinder 5 is rotatably supported at the end on the side not having the pouring port 3.

The tip of the arm of the cylinder 5 is rotatably attached to the opposite side of the pouring spout of the container.

6 is an arm, one end of which is fixed to the end of the mount 4 on the spout side;
The other end is rotatably supported at the spout 3a.

Reference numeral 7 designates a load cell that handles the weight of the automatic pouring device consisting of the container 1, the electromagnetic conveyance device 2, and the fireproof wall 3 for pouring, as well as the cylinder 5, arm 6, and molten metal 8 stored in the automatic pouring device. Although the weight of all the molten metals is added, the amount of the molten metal 8 that decreases during the pouring process can be measured since all of the molten metals except for the molten metal 8 are quantitatively determined.

S is a base that supports the load cell 7.

Reference numeral 9 denotes a mold, which is conveyed by a conveyor (not shown) or the like, and its molten metal receiving port faces the pouring port 3a.

In the above configuration, the main focus of the present invention is to maintain the point P where the molten metal surface contacts the electromagnetic conveying device 2 at all times regardless of the amount of molten metal 8 by the action of the tilting device of the automatic pouring device mainly composed of the cylinder 5. It is to keep it.

In the above configuration, it is assumed that the surface of the molten metal 8 is in contact with the electromagnetic transfer device 2 at a point P with the electromagnetic transfer device not operating as in the illustrated state.

Therefore, when pouring metal into the molds 9 that are sent sequentially, alternating power is supplied to the moving magnetic field generating device of the electromagnetic conveying device 2 to generate a moving magnetic field toward the pouring port 3a.

At this time, the portion of the molten metal 8 facing the moving magnetic field generator 2b functions equivalent to the secondary conductor of the electric motor, and is guided obliquely upward along the fireproof wall 2b.

In this manner, the molten metal 8 is transported to the pouring port 3a by the electromagnetic transport device 2, and poured into the mold 9.

At this time, the amount of poured metal per unit time is regulated by the transport distance of the molten metal 8 of the electromagnetic transport device 2, the inclination angle of the electromagnetic transport device 2, and the electric power given to the moving magnetic field generator 2b.

Now, as the metal is poured into the mold 9 one after another, the amount of molten metal 8 in the pouring device gradually decreases, and this decrease can be clearly detected by the load cell 7. .

If the amount of decrease in the molten metal 8 is, for example, the amount by which the molten metal surface angle changes by θ with respect to point P, then the pouring device is tilted by the angle θ based on the operation control of the hydraulic cylinder 5 in accordance with this decrease amount. If this is done, the end of the hot water surface facing the electromagnetic conveying device 2 will still be regulated by the point P.

In this way, the amount of molten metal reduced by pouring is detected by the mouth-docel, and the angle of the molten metal surface is predicted based on experience. Based on this, the tilting control is automated, so that the conveyance distance of the molten metal 8 is always constant. done to.

However, as the inclination of the electromagnetic transport device 2 changes as it tilts, there is a tendency for the thrust to increase, so when particularly precise control is required, this increase in thrust can be absorbed by the moving magnetic field generator 2b. This should be done based on the adjustment of the power supplied to the

Based on this power adjustment and the tilting control of the pouring device, the pouring amount per unit time is kept approximately constant and pouring is performed sequentially into the continuously fed molds.

Note that the fireproof wall 3 for the pouring spout is not necessarily necessary, and a configuration may be adopted in which the tip of the electromagnetic conveying device 2 is directly used as the pouring spout.

As described above, the automatic pouring control method according to the present invention has a configuration in which an electromagnetic conveying device is connected to a container, and is equipped with a tilting device to detect the amount of molten metal held in the pouring device. The tilting control is performed so that the end of the molten metal surface faces a fixed position of the electromagnetic conveying device regardless of the angle.

Based on such a configuration, first of all, the length of the electromagnetic conveying device, which provides extremely high accuracy in quantitative supply compared to conventional tilting-based pouring, is extremely short, and as a result, the bottom of the container has Since there is no longer any room for the electromagnetic conveyance device to extend, the bottom of the container does not need to have a thick fireproof wall at all, resulting in the advantage that the electromagnetic conveyance device and the container can be extremely easily joined by flange connection or the like.

Secondly, since the length of the electromagnetic conveying device that faces the molten metal is always regulated to be constant when pouring starts, there is no time lag in the start of pouring, and continuous pouring into the mold is advantageous. Thirdly, the transport path by the electromagnetic transport device is sufficiently short compared to the conventional structure, which brings about the advantage that temperature drop can be kept to a minimum.

Needless to say, such features can be achieved by adding to the conventional electromagnetic conveying device a completely new technical idea of tilting according to the amount of molten metal in the pouring device.

In addition, by arranging the center of the tilting of the pouring device at the pouring spout as in the above embodiment, the pouring spout hardly changes due to the tilting, making it convenient for sequential pouring into molds that are continuously fed. Although this is a good idea, ideally it is desirable that the center of rotation be the center of the spout of the mold into which the molten metal is poured.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Container, 2... Electromagnetic conveyance device, 3... Fireproof wall for spout, 3a... Pour spout, 5... Hydraulic cylinder, 7... Load cell.

Claims (1)

[Claims] 1. In a configuration comprising a container for storing molten metal, a means for detecting the amount of molten metal in the container of an electromagnetic transport device fixed to the container and generating a magnetic field traveling obliquely upward, and a means for tilting the container, 1. An automatic molten metal pouring control method characterized by controlling the tilting of a container so that the molten metal surface reaches a specific point on an electromagnetic conveying device regardless of the amount of molten metal.