JP2826861B2 - Detector for detecting the amount of molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an instant melting apparatus for an ingot of aluminum or an aluminum alloy (hereinafter referred to as an aluminum-based metal). The present invention relates to a detection device suitable for detecting the like.

[Prior art] As means for detecting the amount of molten metal discharged from the seed, there is a so-called electrode method in the related art, and a detecting means for detecting a molten metal on a furnace wall and a bottom wall at a detection level in a heating furnace is used. Two electrodes, plus and minus, are buried, and the time when a circuit is formed or released is detected by the presence or absence of contact between each electrode and the molten metal to determine whether the molten metal is at a reference level (fluid level), or The amount of water drop from the reference level was detected (in this case, the amount of hot water was detected, and this detected value was used for controlling the amount of hot water.

[Problems to be Solved by the Invention] By the way, in the conventional electrode system, since the level of the molten metal or the amount of the molten metal is detected in relation to the furnace wall level where the electrodes are arranged, the electrode for detection is temporarily assumed. However, even if the number is increased, the detection value can be made only discontinuously, and thus the amount of hot water can be controlled only in a stepwise manner.

Also, the detection operation may be inaccurate due to the sticking of the stick to the tip of the electrode.

However, in the case where the aluminum ingot is supplied as small droplets to the heating furnace in small amounts, such as in the cold material insertion melting method as in the application of the present invention, the molten metal discharge amount is also continuously increased. It is desirable to be able to detect and to be able to continuously control the amount of hot water based on this detected value.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for detecting the amount of molten metal discharged, which solves the above-mentioned problems (problems) of the conventional device.

[Means for Solving the Problems] The present invention provides a support on the bottom wall near the outlet of the heating furnace,
The present invention relates to a device for detecting the amount of molten metal discharged in which the following components are arranged on this support.

I. A first load sensor fixed to a lower surface of a support and detecting a downward load applied through a molten metal.

B. A second load sensor fixed to the upper surface of the support and detecting an upward load applied via the molten metal.

C. An adder provided on a support or another fixed portion, for adding the respective detected values of the first load sensor and the second load sensor, and for detecting a molten metal discharge amount or the like based on the addition result;

In this case, it is desirable that each of the first load sensor and the second load sensor is a load cell or a device for detecting the amount of molten metal discharged mainly from the load cell.

Further, as a heating furnace to which the detection device of the present invention is applied, when pouring a molten metal of an aluminum-based metal into a casting machine such as a die casting machine, a component corresponding to the molten metal at a position close to the casting machine. It is desirable that the heating furnace be used when the aluminum ingot is supplied as a cooling material, rapidly melted to form a molten metal, and heated.

[Operation] The detection device of the present invention includes two load sensors. One of the load sensors detects both the upward and downward loads applied through the molten metal of the heating furnace, and the other load sensor detects the upward load. Since only the sensor is detected as a positive value, by adding the outputs of both load sensors,
Only the load signal proportional to the level of the molten metal (the level of the molten metal) or the amount of molten metal can be continuously taken out.

EXAMPLES The present invention will be specifically described below with reference to one example shown in FIGS.

First, a cold material melting device to which the tapping amount detection device of the present invention is applied will be described with reference to FIGS.

FIG. 2 is a side view showing the arrangement of the entire cold material insertion rapid melting apparatus of the present invention, and FIG. 3 is a side view showing the structure of the inner furnace part.

In each of the figures, reference numeral 10 denotes the entire cold material insertion rapid melting apparatus of the present invention, and reference numeral 11 denotes a cold material insertion guide which serves as a guide for cold material insertion. Is introduced into the melting furnace 12 and the droplets of the aluminum-based metal melted in the melting furnace 12 are prevented from scattering outside the furnace.

Aluminum ingots are non-standard and their shapes and dimensions are not specified, but usually two or three trapezoidal projections are formed on the top surface, almost flat and V or U-shaped grooves formed on the top surface. I have.

FIGS. 4 (a) and 4 (b) show typically two types of aluminum ingots. In the present invention, the flat bottom surfaces of the two aluminum ingots are back-to-back to form a pair, and the transfer and melting are performed. Fig. 4 (c) shows the two ingots shown in Fig. 2 (b) with their flat bottom surfaces 21 back-to-back and upright.
The U-shaped groove 23 on 22 is used as a groove for engaging the claw of the gripping member of the cooling material supply device 19.

The melting furnace 12 is an upright hollow cylindrical furnace made of a refractory material.
Is cooled and cooled by an induction coil 13 provided on the outer periphery of the furnace wall.
Heat 20 from its surface to dissolve.

Outflow hole 12 'penetrating axially downward through the bottom wall of melting furnace 12.
Is provided, and aluminum droplets drop downward from the outflow holes 12 '.

Numeral 14 denotes a heating furnace arranged coaxially below the melting furnace 12, and is an upright hollow cylinder made of a refractory material having substantially the same shape as the melting furnace 12, and has a bottom wall similar to the melting furnace 12. An outlet coil 14 'penetrating into the die is provided, and the induction coil 15 provided on the outer periphery of the heating furnace 14 is heated to a temperature at which hot water flows into a die of a casting apparatus such as a die casting machine, for example, 720 ° C.

At the bottom of the heating furnace 14, there is provided a hollow tubular tapping pipe 16 extending downward from the outside so as to surround the outflow hole 14 'and communicate with the heating furnace as an extension thereof.

16a is an iron material, which is arranged in the tapping pipe 16 for forming a magnetic path.

The tapping pipe 16 is an elongated hollow pipe having a closed bottom with a closed bottom, and a tapping port 16 for tapping into a die such as a die casting machine 18 at a position close to the bottom of the side wall. An electromagnetic pump 17 for applying thrust to the molten metal at the time of tapping is attached to a portion of the side wall of the tapping pipe 16 above the tap hole 16 '.

This electromagnetic pump 17 not only gives thrust to the molten metal at the time of tapping, but also discharges aluminum droplets generated in the
Drops downward from 12 ', flows into the heating furnace 14, turns into molten metal, passes through the outflow hole 14', and flows into the tapping pipe 16 below it, giving a thrust in the opposite direction to the tapping. It also serves to keep the molten metal from flowing out of the spout 16 '.

Next, an apparatus for detecting the amount of molten metal discharged from the heating furnace 14 will be described with reference to FIG.

In this figure, the same parts as those in FIG. 3 are denoted by the same reference numerals.

24 is a support formed on the lower wall of the heating furnace 14, 25 and 26
Is a load cell attached to the lower surface and upper surface of the support 24, or a first load detection sensor and a second load detection sensor mainly composed of the load cell. The sensor 25 applies a downward load, and the sensor 26 applies Detects upward load.

27 is an adder for adding the outputs of the first and second load detection sensors 25 and 26.

Although the adder 27 is illustrated separately from the support 24 for convenience of illustration, it is assumed that the adder 27 is installed on an appropriate fixed portion such as the support 24. These 25 to 27 constitute the detection device 28 of the present invention.

Next, the operation of the melting operation by inserting the cold material and the operation of detecting the amount of the molten metal discharged according to the present invention will be described.

As shown in FIG. 4 (c), a plurality of pairs of the cold material 20 consisting of a pair of ingots in which two ingots are back to back,
The cold material supply device 19 transports the cold material to the vicinity of the cold material insertion guide 11 of the cold material insertion and melting device 10 of the present invention.

The vertical and horizontal movements are combined by an air cylinder or the like, and the cold material 20 is inserted one by one into the melting furnace 12 via the cold material insertion guide 11.

If the already inserted cold material 20 is in the melting furnace 12,
The cold material 20 gradually lowers its height in the melting furnace 12 as the melting progresses, and when the next cold material 20 is inserted, the interlinkage line with the magnetic flux from the induction coil 13 changes its type. The optimal position for melting of the cold material 20, that is, the optimal melting linkage position P (this position is, as shown in FIG.
Can be said to be at the position where they face each other).

The cooling material 20 inserted into the melting furnace 12 in the state adjusted in this way is induction-heated by the induction coil 13, and the melting proceeds from the surface thereof, forms droplets, and propagates along the surface of the ingot, so that the melting material 12 After passing through the outlet hole 12 'at the bottom, it is dropped into the heating furnace 14, and further flows through the outlet hole 14' into the tapping pipe 16.

In this state, the temperature raising coil 15 is energized, and the electromagnetic pump 17 gives a thrust in a direction opposite to that of the molten metal, that is, an upward thrust to the molten metal so that the molten metal does not flow out of the molten metal outlet 16 'by the action of gravity.

As the melting of the cold material 20 in the melting furnace 12 progresses, the heating furnace
The molten metal that has flowed into the tapping pipe 14 and the tapping pipe 16 forms a pool of a sufficient quantity of tapping water, so if it has reached a temperature suitable for tapping, it will remain at the specified temperature by the heating coil 15 if the tapping temperature has not been reached. The electromagnetic pump 17 in the direction of hot water,
In other words, a downward thrust is given to the molten metal, and the molten metal is poured from the tap hole 16 'into a die of a die casting machine.

In this case, in the present invention, since the first and second load sensors are provided in the heating furnace 14 as shown in FIG. When supplied, a downward load W corresponding to the level of the molten metal in the heating furnace 14 is generated.

On the other hand, when the electromagnetic pump 17 is driven,
The upward thrust-力 W works. Therefore, the load of W-ＷW is applied to the first detection sensor, and the load of + △ is applied to the second load sensor.
The load of W is detected and added in the adder 27, so that the load W only by the molten metal can be taken out.

The value of the load W is a signal corresponding to the level of the molten metal as an instantaneous value and the amount of hot water if it is taken as a deviation value, and the required hot water amount control can be performed using this detection signal.

The feature of the present invention is that the detection signal corresponding to the amount of hot water detected by the detection device 28 constituted by the sensors 25 and 26 and the adder 27 is a continuous value.

According to the present invention, the load cell or the first and second load sensors mainly composed of the load cell as described above are provided on the lower surface and the upper surface of the support provided on the bottom wall near the outlet of the heating furnace. The present invention relates to a device for detecting a molten metal discharge amount or the like in which the molten metal level is detected based on an added value of the outputs of these respective sensors, and has the following excellent effects.

Since the level or volume of molten metal can be detected continuously,
It is suitable for controlling the amount of molten metal that is continuously supplied as in a heating furnace of an instant melting device for an ingot (cold material) of an aluminum-based metal.

In addition, since the components of the detection device of the present invention are for non-contact detection, they are not affected by slag and operate stably. There is no danger that the values will become unstable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, FIGS. 2 and 3 are side views and longitudinal sectional front view respectively showing a cold material melting apparatus to which the present invention is applied, and FIG. This figure shows the cold material used in the cold material melting device. (A), (b)
Is a perspective view, and (c) is a front view. 14: heating furnace, 14 ': outlet 16: tapping pipe, 16a: iron material 17: electromagnetic pump 24: support 25: first load sensor 26: second load sensor 27: adder 28 : detecting device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-109151 (JP, A) JP-A 52-26566 (JP, U) JP-A 60-80052 (JP, U) 11881 (JP, B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) F27B 1 / 28,14 / 06,14 / 20 B22D 17/30

Claims (3)

(57) [Claims] 1. An apparatus for detecting the amount of molten metal discharged, wherein a support is provided on a bottom wall near an outlet of a heating furnace and the following structure is disposed on the support. I. A first load sensor fixed to a lower surface of a support and detecting a downward load applied through a molten metal. B. A second load sensor fixed to the upper surface of the support and detecting an upward load applied via the molten metal. C. An adder provided on a support or another fixed portion, for adding the respective detected values of the first load sensor and the second load sensor, and for detecting a molten metal discharge amount or the like based on the addition result; 2. The apparatus according to claim 1, wherein each of the first load sensor and the second load sensor mainly includes a load cell or a load cell. 3. An aluminum ingot of a component corresponding to the molten metal at a position close to the casting machine when pouring a molten metal of an aluminum-based metal into a casting machine such as a die casting machine. 3. The apparatus according to claim 1 or 2, wherein the temperature of the molten metal is supplied as a cooling material, and the molten metal is rapidly melted to form a molten metal.