JPS625222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic melt amount control device for a non-ferrous metal melting furnace.

Conventional means for detecting the melt level in a melting furnace include a method using a float, or a detection end piece or a fixed electrode fixed at a predetermined position, in which the melt level is detected by touching it. is used.
However, the former had poor indication accuracy, and the latter only detected whether the current molten metal level was higher or lower than a preset standard molten metal level, that is, whether there was an excess or deficiency of molten metal. . Therefore, all of these detection means were often used for the purpose of preventing overflow of molten metal.

The present invention provides an automatic melt amount control device that detects the position of the molten metal at predetermined time intervals by moving up and down electrodes that can be called antennas for detecting the molten metal level, and also replenishes the molten metal as necessary. It is related.

That is, as shown in the embodiment in the drawings, electrodes 1 and 2
The electrodes 1 and 2 are arranged such that their lower ends are always located on the same horizontal plane and are movable up and down, and the electrodes 1 and 2 are arranged such that when they touch the molten metal 16 of the melting furnace, the detector 3 is energized. A detection circuit 5 surrounding the electrodes 1 and 2 is provided, and a vertical drive motor 6 and a drive device 18 for the electrodes 1 and 2 are provided, and for the drive motor 6,
Electrode 1, depending on the time interval set by timer 7.
A forward/reverse switching device 8 is provided, which controls the downward stroke of No. 2 and controls the upward stroke by detecting the current of the detector 3. Further, the drive motor 6 is provided with a pulse transmitter 9 on its drive shaft, and the pulse transmitter 9 is an upper limit pulse counter that divides the number of integrated pulses into three regions according to the amount of rotation of the drive shaft, that is, the amount of descent of the electrode. 10. The intermediate pulse counter 11 and the lower limit pulse counter 12 are connected, and the required burner valve opening degree is determined through a signal discriminator 19 that discriminates the number of counts sent from the three types of pulse counters to the melting chamber burner 13. A fire power control mechanism that responds to changes in the molten metal surface is constructed by providing a fire power adjustment facility (not shown) that instructs and adjusts the temperature.

In addition, 14 is a material input part of the melting furnace, 15 is a holding chamber,
Reference numeral 16 indicates the hot water level, and FIG.
This is to prevent scales from entering this area and to ensure precision in measurement.

20 is a count up signal circuit, 21 is a count reset signal circuit, and 22 is a hot water level reaching signal circuit.

The present invention is constructed as described above, and includes electrodes 1,
The timer 7 is set so that the melting chamber burner 13 is lowered at predetermined intervals to detect the melting water level, and the necessary heat adjustment is applied to the melting chamber burner 13 based on the pulse count at that time, controlling the amount of material melted and adjusting the melting water level. The water level is maintained at a preset standard level.

Therefore, there is no need to waste money, such as consuming a large amount of melting heat and melting time due to repeated marginal reductions of molten metal, leading to reduction in man-hours and energy saving.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention.
The figure shows a cross-sectional view of the melting furnace, and FIG. 2 shows the connection of each element of the electrode installation part in the melting furnace. 1, 2... Electrode, 3... Detector, 4... Power supply, 5... Circuit, 6... Drive motor, 7... Timer, 8... Forward/reverse switching device, 9... Pulse transmitter, 10, 11, 1
2...Pulse counter, 13...Dissolution chamber burner,
14... Material input section, 15... Holding chamber, 16... Hot water surface,
17... Submergence path, 18... Drive device, 19... Signal discriminator, 20... Count up signal circuit, 21... Count reset signal circuit, 22... Hot water level reaching signal circuit.

Claims (1)

[Claims] 1 Electrodes 1 and 2 and a detector 3 that are energized when a pair of electrodes 1 and 2 touch the molten metal in the melting furnace;
A detection circuit 5 surrounding the power source 4 is provided, and the electrodes 1,
2 is arranged so as to be movable up and down, and is provided with a vertical movement drive motor 6, and a timer 7 is connected to the drive motor 6.
A forward/reverse switching device 8 is provided to control the downward stroke of the electrodes 1 and 2 according to each set time interval, and to control the upward stroke by detecting the current of the detector 3. A pulse transmitter 9 is provided, and the pulse transmitter 9 has a plurality of pulse counters 1 corresponding to the amount of rotation of the drive shaft, that is, the amount of descent of the electrode.
0, 11, 12, etc., and connect the pulse counter 10 or 11, etc. to the melting chamber burner 13.
An automatic melt amount control device for a non-ferrous metal melting furnace, which is configured to be able to respond to changes in the molten metal surface by providing a fire power adjustment mechanism corresponding to 12 or the like.