JPS60240984A - Material charger in metallic material melting furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material charging device in a metal material melting furnace,
Particularly, in a melting furnace having a preheating flue extending in the horizontal direction and preheating a predetermined metal melting material in the preheating flue, the metal melting material is effectively introduced into the preheating flue from the entrance thereof. This relates to a device that is adapted to be charged into a container.

BACKGROUND ART A vertical furnace called a so-called tower melter has been known as a metal material melting furnace provided with a vertically extending melting chamber. And, such a melting furnace is 6 years old, "Al-Aru", pp. 27-32 (March 1982 issue), rMODERNME TAL S J, V
ol, 38. No, 11. P, 76 (1982)
As disclosed in et al., the furnace generally has a cylindrical furnace body installed in the vertical direction, and the furnace lid provided at the upper end opening of the furnace body is opened, and a predetermined charging machine is charged. The molten metal material is introduced into the furnace body, and the molten metal material is preheated while gradually descending through the furnace body, and is further heated by a burner installed at the bottom of the furnace body. The material is melted by heating and stored in a holding chamber connected to the lower part of the furnace body.

However, in such a melting furnace, when the metal material to be melted is, for example, a laminated block material made by stacking metal ingots in multiple stages, there is a possibility that such metal melting material and the furnace inner wall may A so-called short-pass phenomenon occurs in which high-temperature exhaust gas blows upward through the furnace through such gaps, and the heat of the exhaust gas cannot be effectively used for material preheating. It has inherent problems. In addition, even if such a gap is small immediately after charging the material into the furnace, the material begins to melt as time passes after charging, and the gap between the furnace inner wall and the material becomes larger, causing the material to melt. The preheating effect will be reduced.

On the other hand, instead of a device with a structure in which the preheating section is connected vertically to the melting section, a horizontal flue is installed to guide the high temperature exhaust gas from the melting chamber in a horizontal direction, and such a horizontal flue is installed. In Hokkaido, a structure was devised in which a predetermined amount of melted material was preheated, which significantly alleviated the problems with the vertical melting furnace mentioned above and improved the material preheating effect. It is.

Therefore, in such a horizontal flue type melting furnace, depending on the amount of melted metal material melted in the melting chamber, how can the metal be melted into the horizontal flue from its entrance? In addition, when to charge the metal melting material is an important issue in continuous melting operation of such a melting furnace. However, if more material is charged than the amount of metal material melted in the melting chamber, the melting chamber may become clogged with metal materials, causing problems such as hanging on shelves. Furthermore, if less material is charged than the melted amount, it will naturally not be possible to obtain the desired amount of molten metal, and furthermore, this will cause problems such as loss of input energy due to dry firing of the burner. It is.

Of course, one method of charging such materials is to mechanically charge a predetermined molten metal material into a preheating flue at regular intervals set by a timer, and after preheating,
It is conceivable to feed the material into the melting chamber, but such a mechanical charging method at predetermined intervals cannot deal with variations in the weight of the material, as described above. Overcharging or undercharging will occur.

The present invention has been made against this background, and its object is to have a horizontal flue that guides high-temperature exhaust gas from the melting chamber in a horizontal direction, and to A melting furnace in which a metal melting material that is moved and set in a flue is preheated by the exhaust gas,
The horizontal flue is charged with a material substantially corresponding to the metal material to be melted in the melting chamber, so as to prevent overfeeding or underfeeding of material to the melting chamber, and to ensure accurate melting of material. This is to ensure that the input energy is used effectively.

That is, in order to achieve such an object, the present invention provides a melting chamber in which a predetermined metal melting material is directly melted by a burner, and a horizontally extending melting chamber through which high temperature exhaust gas from the melting chamber is passed. and a preheating flue;
the molten metal material being moved through the preheating flue;
In a melting furnace that is preheated to a predetermined temperature by exhaust gas discharged from the melting chamber, (a) a charging cart on which the metal melting material is placed and which can approach the entrance of the preheating flue; (b) a pusher for pushing the metal molten material placed on the charging truck into the preheating flue from its entrance; and (C) a pusher for pushing the metal molten material placed on the charging truck (d) a weight measuring means that measures the weight and outputs an electrical signal according to the weight; and (d) receiving a signal from the weight measuring means and determining the melting amount per unit time of the melting chamber set. , and a control device that controls the push-in operation of the busher in order to determine the timing of charging the next metal melting material into the preheating flue.

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail based on the drawings.

First, in FIG. 1, the melting furnace 2 includes a preheating flue 4 located above and extending horizontally, and a melting flue 4 opening at the front end of the preheating flue 4 extending vertically downward into the floor thereof. It has a chamber 6 and a holding chamber 8 which is connected to the lower end of the dissolution chamber 6 and extends in the horizontal direction. A charge door 10 is provided at the entrance of the preheating flue 4 so as to be movable up and down.
The inlet portion of the preheating flue 4 is opened and closed by the vertical movement of the preheating flue 4. Further, an exhaust gas outlet 12 is provided adjacent to the inlet of the preheating flue 4, and the inside of the preheating flue 4 is passed through the exhaust gas outlet 12 into the melting chamber 6.
Exhaust gas that has been circulated from the side is discharged to the outside.

Further, the dissolution chamber 6 has a shaft portion 14 having an elongated opening (cross-sectional shape) in the horizontal direction in the figure, such as an oval shape, an elliptical shape, or a rectangular shape. At the bottom of this shaft portion 14, there is a metal base 16 that has been dropped.
Burner devices (not shown) for melting the laminated block material 18 are provided on opposite side walls in the direction perpendicular to the plane of the paper, and the burner is heated from the downwardly inclined burner ports. The combustion flame or combustion exhaust gas of the device is brought into contact with the metal base metal 16 constituting the fallen laminated block material 18.

In addition, the molten metal 20 obtained by melting in the melting chamber 6 is guided to the holding chamber 8, and is accommodated and held therein. A burner device (not shown) is provided to keep the molten metal 20 warm.

On the other hand, a material charging device 22 is provided close to the entrance side of such a preheating flue 4. This material charging device 22
A charging truck 24 that can approach and separate from the inlet opening of the preheating flue 4, and a laminated block material 18 as a metal melting material placed on the charging truck 24, are connected to the preheating flue 4. It has a button 26 that is pushed inside from the entrance portion.

Note that this pusher 26 has a cylinder 28, a piston rod 30, and a push plate 32 fixed to the tip thereof, and as the push plate 32 moves forward, it pushes the laminated block material 18 on the charging cart 24. It can be moved and slid into the preheating flue 4.

Further, the guide rail 34 as a guide member that guides the charging cart 24 toward the entrance of the preheating flue 4 has an independent structure separated from other members,
A load cell 36,36 is provided on the support portion that supports the guide rail 304, so that the weight of the laminated block material 18 placed on the charging cart 24 can be measured.

Further, the weight of the laminated block material 18 measured by the load cell 36 in this manner is output as an electrical signal corresponding to the weight, amplified by the load cell amplifier 38, and then input to the control device 40. It is.

Note that this control device 40 is configured to receive an exhaust gas temperature signal from a temperature sensor 42 that detects the temperature of exhaust gas discharged to the outside through the exhaust gas outlet 12 of the preheating flue 4, and to A molten metal level signal from a molten metal level detection sensor 44 that detects the level of molten metal 20 in chamber 8 is also input.

Then, upon receiving these signals, the control device 40 controls the set melting amount (Kg/
Hr: melting capacity], determine the charging timing of the next laminated block material (metal melting material) 18 into the preheating flue 4, and based on this, calculate the charge timing from the hydraulic pump 46 to the cylinder 28 of the busher 26. A directional control valve 48 for switching the supply of pressure oil is controlled, thereby controlling the pushing operation of the laminated block material 18 by the pusher 26.

Therefore, in such a material charging mechanism, first, the weight of the laminated block material 18 placed on the charging cart 24 to be charged into the preheated smoke 3M4 is determined by the load cell 36. When the measurement is performed and the result is input as an electrical signal to the control device W40, the control device 40 calculates the weight of the laminated block material 18 on the charging cart 24 and the melting amount (melting amount) in the melting chamber 6 set. The melting time for the laminated block material 18 is determined by the laminated block material 18, and this melting time is used as the charging timing for the laminated block material 18 to be charged next. Accordingly, the weight of the laminated block material 18 (
There is one charge timing corresponding to a constant melting capacity (Kg/1lr) according to h).

Charge timing [■r] One weight (Kg) ÷ Melting capacity (Kg/1lr) Note that this melting capacity, in other words, the amount of melting per unit time of the melting chamber 6 exceeds the maximum capacity of the melting chamber 6. Of course, it is set so that there is no such thing. Also,
According to the charge timing set by the control device 40, the directional control valve 48 provided on the oil path of the pressure oil supplied from the hydraulic pump 46 to the cylinder 28,
By issuing a switching command from the control device 40,
When the pusher 26 is activated, the laminated block material 18 on the charging truck 24 is forced into the preheating flue 4 at a predetermined charging time.

Further, the exhaust gas temperature signal from the temperature sensor 42 inputted to the control device 40 is transmitted in the melting furnace 2.
This serves as an interlock in case the melting work is delayed for some reason, and since the exhaust gas temperature rises as the material melts in the melting chamber 6, the The increase in temperature is checked, and when the exhaust gas temperature exceeds a set value, for example 250 to 300° C., the control device 40 outputs a switching command to the directional switching valve 48.

Furthermore, the level of the molten metal 20 in the holding chamber 8 is monitored by inputting a molten metal level signal from the molten metal level detection sensor 44, and when the holding chamber 8 is full with the molten metal 20, the signal is By interlocking the charging operation, overflowing of the molten metal 20 from the holding chamber 8 is prevented.

Thus, according to this material charging mechanism, the preheating flue 4
The timing of charging the material into the interior is determined by the load cell 36.
It is determined for each laminated block material 18 according to the set melting capacity (melting N) by weighing each laminated block material 18 as a metal melting material that is sequentially charged. From a certain point, a substantially constant melting capacity can be obtained regardless of the weight of the laminated block material 18, and a substantially constant amount of molten metal 20 is always supplied into the holding chamber 8. from,
The timing of feeding the molten metal 20 from the holding chamber 8 to the next facility can now be planned easily.

In addition, the melting capacity (amount of melting) in the melting chamber 6 of the melting furnace 2
can be changed arbitrarily, making it easy to carry out melting work according to the production plan, and furthermore, the load on the melting chamber 6 in the furnace can be estimated, and the optimal melting control can be performed accordingly. It has also become possible.

The laminated block material 18 as a metal melting material, which is thus sequentially charged into the preheating flue 4 of the melting furnace 2 by the material charging device 22, is as shown in FIGS. 2(a) and 2(b), for example. As shown in FIG.
However, the lowermost four metal base metals 16 are not included), and the metal base metals 16 constituting each of the upper and lower adjacent step portions are approximately close to each other. They are stacked so that they intersect at right angles.

Further, as shown in FIGS. 3(a), (b), and (C), the metal base metal 16 constituting the laminated block material 18 illustrated here is generally approximately It has a trapezoidal cross section, and the plurality of metal base metals 16 are arranged alternately so that the vertical directions are opposite to each other at each step (as shown in FIG. 2(b)). They are combined and arranged parallel to each other.

Furthermore, such a metal base metal 16 has a so-called big (pi)
g), etc., and its shape is as follows:
The ones shown in FIGS. 2 and 3 are the most common, but as is well known, there are other cross-sectional shapes such as rectangular shapes, and furthermore, such metal ingots 16 In addition to the structure shown in the example, there are stacked structures in various forms. In short, according to the present invention, the molten metal material placed on the charging cart 24 and charged into the preheating flue 4 of the melting furnace 2 by the busher 22 may have a predetermined shape. , any type of preheating flue 4 as a stack as shown in FIG. After being charged into the melting chamber 6 and moved through the preheating flue 4 while being preheated, it is desirable that the melting material be charged into the melting chamber 6 substantially on its side.

Although the present invention has been described in detail with respect to one specific example, the present invention is not to be construed as being limited only to the specific example and the accompanying explanation, and the gist of the present invention is not to be construed. It goes without saying that various changes, modifications, improvements, etc. can be made to the present invention based on the knowledge of those skilled in the art without departing from the scope of the present invention, and the present invention also includes such embodiments. It's a good place.

7 1j For example, the present invention can be effectively employed in a melting furnace provided with a melting chamber 6 extending vertically at the front end of the preheating flue 4 as illustrated, but is not limited thereto. However, in the case of a melting furnace equipped with a horizontally extending preheating flue, a melting chamber is provided at the front end of such a horizontally extending preheating flue, in which the predetermined metal melt material is heated by a burner. It can also be applied to devices having a structure that allows melting.

Further, in the embodiment, the laminated block material 18 charged into the preheating flue 4 and preheating is started as a reference, and the laminated block material 18 charged next.
Although the charging timing is set, the preheating flue 4
Generally, there are a plurality of laminated block materials 18 (for example, three as shown in the example), and since preheating is continued, the material for which preheating has started is the next material to be charged. It is not designed to be pushed into the melting chamber 6 by being pushed by.

For this reason, based on the weight difference between the laminated block material 18 (the one on the left in FIG. 1) that is introduced into the melting chamber 6 and the laminated block material 18 (the one on the right in FIG. 1) that has started preheating, Although a change occurs in the amount of melting in the melting chamber 6, the laminated block material 18 whose preheating has started is finally charged into the melting chamber 6 (in the third charging operation). Therefore, when the laminated block materials 18 that are sequentially introduced are averaged, the above-mentioned variation in melt amount can be sufficiently absorbed.

Of course, the weight of the laminated block material 18 on the charging cart 24 is sequentially memorized so that the weight of the laminated block material 18 reaching the front end of the preheating flue 4 and falling into the melting chamber 6 can be estimated. By doing so, it is also possible to determine the charging timing of the laminated block material 1B to be preheated next, and thereby it is possible to further reduce fluctuations in the amount of melting.

As is clear from the above description, the material charging device for a metal material melting furnace according to the present invention sets the material charging timing based on the weight of each charged material measured by the weight measuring means. The control device sequentially determines the melting capacity according to the determined melting capacity, and this makes it possible to effectively deal with variations in the weight of charged materials, thereby always maintaining the prescribed melting capacity. Since this invention is possible, it has achieved a number of excellent effects such as the effective use of input thermal energy, and this is where the great industrial significance of the present invention lies. .

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view of a main part showing an example of the apparatus according to the present invention, FIGS. 2(a) and (b) are a plan view and a right side view of a laminated block material, respectively, and FIG. a)
, (b) and (C) are a perspective view, a cross-sectional view, and a longitudinal cross-sectional view, respectively, of metal ingots constituting the laminated block material. 2: Melting furnace 4: Preheating flue 6: Melting chamber 8: Holding chamber 10: Charge door 12: Discharge port 14: Shaft portion 16: Metal base metal 18; Laminated block material 20: Molten metal 22: Material charging device 24 :Charging trolley 26: Pusher 28 Niji cylinder 30: Piston rod 32: Push plate 3
4 Guide rail 36: Load cell 38: Load cell amplifier 40: Control device 42: Temperature sensor 44: Hot water level detection sensor 46: Hydraulic pump 48: Directional switching valve Applicant: Sumitomo Light Metal Industries, Ltd. Shinagawa Furnace Co., Ltd. 1 0

Claims (5)

[Claims] (1) It has a melting chamber in which a predetermined metal melting material is directly melted by a burner, and a preheating flue extending in the horizontal direction through which high-temperature exhaust gas from the melting chamber passes, and the preheating smoke In a melting furnace in which the metal molten material being moved in the path is preheated to a predetermined temperature by exhaust gas led from the melting chamber, the metal molten material is placed and approached at the entrance of the preheating flue. a charging truck for pushing the molten metal material placed on the charging truck into the preheating flue from an inlet thereof; A weight measuring means that measures weight and outputs an electrical signal according to the weight; and upon receiving the signal from the weight measuring means, calculates the following from the set amount of melting per unit time in the melting chamber. A material charging device for a metal material melting furnace, comprising: a control device that controls the pushing operation of the bushing in order to determine the charging timing of the metal melt material into the preheating flue. (2) The control device receives the temperature signal of the exhaust gas together with the signal from the weight measuring means, and outputs an operation command for pushing the button when the temperature of the exhaust gas is higher than a predetermined set value. A material charging device according to claim 1. (3) The weight measuring means includes an independent guide member that is separated from other members and that guides the loading cart carrying the molten metal material to the entrance of the preheating flue; The material charging device according to claim 1 or 2, further comprising a load cell provided on the support portion. (4) The melting chamber opens at the floor surface at the front end of the preheating flue and extends vertically downward, and the laminated block material moved in the preheating flue is contained in the melting chamber. A material charging device according to any one of claims 1 to 3, which is configured to be charged. (5) Any one of claims 1 to 4, wherein the metal melting material is a laminated block material formed by stacking longitudinal, substantially rectangular metal ingots in a plurality of stages while arranging them horizontally. The material charging device described in the above.