JP2001219261A - Automatic feeding system for melting light metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic feeding system for melting a light metal which is capable of automatically feeding a specified amount of molten metal. SOLUTION: This system has a surface combustion burner 16 installed by directing its combustion surface to a pot 12 in an inner space from the side wall of a furnace casing 15. A metal fiber burner(MFB) or a metal knit burner(MNB) is applied to the surface combustion burner 16. A fixed volume feeding means 13 comprises a pump section 13a which takes the prescribed amount of the molten metal out of the molten metal in the pot 12 and a stop valve 13b which shuts off a flow passage so as not to cause the backflow of the taken out molten metal. Further, the surface combustion burner 28 is interposed in a hot water feed pipe 30 and its circumference between the fixed volume feeding means 13 and a hopper 14 for feeding. The hopper 14 for feeding is provided with a shutter 31 for preventing the sag of the molten metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dissolving light metals,
The present invention relates to a light metal melting automatic hot water supply system capable of automatically supplying a fixed amount of molten metal.

[0002]

2. Description of the Related Art Conventionally, hot water supply operations in cold die casting machines have been carried out by hand, but recently, automatic water heaters 1 have been used mainly for large machines (FIG. 2).
reference). The automatic water heater 1 has a mechanism in which the entire apparatus moves back and forth, and intermittently supplies molten metal from a hopper 3 using an electromagnetic pump 2. In addition, in consideration of safety in the event of a leak of molten metal from a connection portion of the molten metal transfer pipe 4 and the like and maintenance of drainage of molten metal from the molten metal transfer pipe 4, a mechanism for tilting the holding furnace 5 is provided. Equipped. Further, a burner 7 is arranged as a heat source of the holding furnace 5 from one of the side walls toward the bottom of the pot 6.

[0003]

However, in such an automatic water heater 1, (1) although the electromagnetic pump 2 is used to stably supply the molten metal, it is affected by the level of the molten metal in the holding furnace 5. However, it is difficult to make the discharge amount constant. (2) Since the heating is performed from one side of the side wall by one burner 7 which is a heat source of the holding furnace 5, the efficiency is low, and it is difficult to maintain the molten metal in the pot 6 at a substantially uniform melting and holding temperature. (3) Since the molten metal transfer tube 4 is not heated, the molten metal in the tube is solidified and the tube is closed, so that the hot water supply capacity of the electromagnetic pump 2 is not utilized and the discharge amount fluctuates. (4) Due to the tilting mechanism and the like in consideration of safety and maintainability, a large-scale device is required only for the driving part. The present invention has been proposed to solve such problems, and provides a light metal melting automatic hot water supply system capable of melting light metal and automatically feeding a fixed amount of molten metal. With the goal.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a hot water supply system for melting a light metal and supplying a fixed amount of the molten metal intermittently. A melting and holding furnace configured to hold the melt at a melting and holding temperature; a fixed-quantity supply unit that quantitatively removes the molten metal from the melting and holding furnace; A heating source for raising the temperature to a higher use temperature than the melting and holding temperature of the metal and maintaining the same at the use temperature was provided. In the above configuration, the melting and holding furnace accommodates a pot for holding the molten metal, and has a furnace main body having an inner space for heating the pot from the surroundings, and burning from the side wall of the furnace main body to the pot in the inner space. A surface combustion burner installed face-up, and the surface combustion burner can be applied to a heating source in the hot water pipe. Further, the fixed-quantity supply means is constituted by a pump section for taking out a predetermined amount from the molten metal in the pot in the melting and holding furnace, and a stop valve for shutting off a passage so that the molten metal taken out by the pump section does not flow backward, The pump unit has a cylinder immersed in the molten metal in the pot, and a valve body that moves up and down in the cylinder, and a check valve for sucking the molten metal is arranged at the bottom of the cylinder. A communication pipe for feeding the molten metal to the stop valve side is connected to the side surface of the stop valve, and the stop valve has a cylinder mounted on an upper end of the communication pipe, and moves up and down in the cylinder to be fed to the hot water pipe side. A valve body for closing the passage of the molten metal to be supplied, and a fixed amount of the molten metal is fed to the hot water supply pipe side by interlocking control of the pump unit and the valve body of the stop valve Person,
By adjusting the stroke of the valve element in the cylinder, the amount of molten metal fed into the hot water pipe side is controlled. Further, a hot water supply hopper for temporarily holding the molten metal is provided at the distal end side of the hot water supply pipe, and a dripping preventing means for the molten metal to be supplied to the hot water supply hopper is provided. Further, a discharge hole for discharging molten metal in the hot water pipe can be provided on a side surface of the cylinder.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the light metal melting automatic hot water supply system according to the present invention will be described with reference to the drawings. FIG. 1 shows a light metal melting automatic hot water supply system 10.
A furnace for melting light metal and holding the molten metal, that is, a melting furnace 1
(1) a constant amount supply means for intermittently supplying a constant amount irrespective of the fluctuation of the molten metal level, wherein a fixed amount supply means for taking out a predetermined amount of molten metal from a pot disposed in a melting furnace; And a hot water supply hopper 14 for supplying the extracted molten metal.

The melting furnace 11 accommodates a pot 12 and has a furnace body 15 having an inner space for heating the pot 12 from the surroundings, and a combustion surface from a side wall of the furnace body 15 to the pot 12 in the inner space. Surface combustion burners 16 and 16 installed facing the same. The pot 12 includes a furnace body 15
The structure is such that it is inserted and supported in the inner space from above. In the pot 12, the molten metal is held at the melting holding temperature by the surface combustion burners 16,16. The top side of the pot 12 is shielded by the lid member 17, and the space above the molten metal surface in the pot 12 is filled with an inert gas to prevent fire. In addition,
Such a fire prevention measure is also taken for the fixed quantity supply means 13 and the hot water supply hopper 14, and the inside space of the fixed quantity supply means 13 and the hot water supply hopper 14 is similarly filled with an inert gas. I have to. As the surface burning burner 16, a metal fiber burner (MFB) or a metal knit burner (MNB) can be applied.

[0007] Further, the fixed-quantity supply means 13 comprises a pot 1
2. A pump unit 13a for taking out a predetermined amount of molten metal from the molten metal in 2 and a stop valve 1 for shutting off a passage so that the molten metal taken out by the pump unit 13a does not flow backward
3b. The pump unit 13a includes:
A cylinder 18 immersed in molten metal in the pot 12;
And a valve element 19 that moves up and down in the cylinder 18. The valve element 19 is electrically driven (servo motor 20). Also, the valve body 19 and the stop valve 13b
Is electrically controlled in an interlocked manner. In addition, by adjusting the stroke of the valve element 19 that moves up and down in the cylinder 18, the amount of the molten metal to be taken out can be controlled. The bottom of the cylinder 18 is provided with a plug 21.
The plug 21 is provided with a suction hole 22, and a ball 23 having a specific gravity slightly larger than that of the molten metal is placed thereon to constitute a check valve. A communication pipe 24 for feeding molten metal to the stop valve 13b side is connected to a side surface of the cylinder 18 for communication. Further, a discharge hole 25 is provided on the upper side of the side surface of the cylinder 18. On the other hand, the stop valve 13b is connected to a cylinder 26 mounted on the upper end of the communication pipe 24 from the cylinder 18.
And moves up and down in the cylinder 26 to make the hot water supply hopper 1
Valve body 27 for closing the passage of the molten metal fed to the fourth side
have.

A hot water pipe (described later) and a surface combustion burner 28 are arranged around the hot water pipe between the fixed quantity supply means 13 and the hot water supply hopper 14 as described above. This surface combustion burner 28 has a combustion surface 28a on a cylindrical inner wall,
The surface combustion burner 28 has the stop valve 1
A hot water supply pipe 30 for feeding molten metal is inserted from 3b through hot water supply hopper 14 via supply pipe 29.
When the molten metal passes through the hot water supply pipe 30, the surface combustion burner 28 raises and heats the molten metal at the melting and holding temperature to raise the temperature to the temperature at which the molten metal is used. The hot water supply pipe 30 is installed with the hot water supply hopper 14 side slightly higher. The hot water supply hopper 14
Has a shutter 31 for preventing dripping of molten metal to be supplied.
Is provided.

The automatic hot water dissolution system 10 for light metal dissolution according to the present invention is constructed as described above. Next, the operation of the automatic hot water dissolution system 10 for light metal dissolution will be described.
Pot 1 into which light metal to be melted (magnesium, aluminum, etc.) is charged by an appropriate charging means (not shown)
2 is supplied to the pot 12 by the surface combustion burners 16, 16.
The light metal can be melted by heating the entire outer peripheral wall. At this time, the surface combustion burner 16 for heating the pot 12
Since the combustion surface is planar, the entire outer peripheral wall of the pot 12 can be heated almost uniformly and efficiently without being locally heated.

Next, by driving the servo motor 20 of the pump section 13a in the fixed quantity supply means 13 to move the valve body 19 upward in the cylinder 18 immersed in the molten metal in the pot 12, the bottom of the cylinder 18 The ball 23 is lifted up, and molten metal can be introduced from the suction hole 22 of the plug 21. In this case, as long as the molten metal surface is above the suction hole 22 at the bottom of the cylinder 18, a predetermined amount of the molten metal can be introduced into the cylinder 18. Then, the molten metal is held in a state of being filled in the communication pipe 24 reaching the stop valve 13b and the cylinder 26 of the stop valve 13b.

Next, when the molten metal is fed into the hopper 14 from this state, the valve element 19 is lowered in the cylinder 18 of the pump section 13a and the valve element 27 in the cylinder 26 on the stop valve 13b side is moved. Move up. Thereby, a certain amount of molten metal can be fed into the supply pipe 29. At this time, by adjusting the stroke of the valve element 19 in the cylinder 18 of the pump section 13a, the amount of molten metal fed into the supply pipe 29 can be controlled. Supply pipe 2 for a fixed amount of molten metal
9, the valve body 27 of the stop valve 13b
While the cylinder 18 of the pump section 13a is
By moving the valve body 19 upward, the ball 23 at the bottom of the cylinder 18 is raised, and molten metal is introduced from the suction hole 22 of the plug 21. By repeatedly performing the above operations, a constant amount of molten metal can be supplied to the supply pipe 29 at all times.

When the molten metal passes through the hot water supply pipe 30 in the surface combustion burner 28 from the supply pipe 29, the temperature of the molten metal is raised from the melting holding temperature to the use temperature by the surface combustion burner 28. The molten metal does not solidify. Immediately before pouring into a supply destination, the surface combustion burner 28 causes a predetermined amount of
The hopper 14 can be maintained at the operating temperature.
, A certain amount of molten metal can be poured into the supply destination without any inconvenience. In addition, when pouring the molten metal, the shutter 31 provided on the hot water supply hopper 14 can prevent the molten metal from dripping unintentionally, and the safety is further enhanced. On the other hand, when the molten metal is drained, the pump 1
By moving the valve body 19 in the cylinder 18 of 3a above the position of the discharge hole 25 and moving the valve body 27 on the side of the stop valve 13b upward, the molten metal is transferred through the supply pipe 29 and the communication pipe 24. Can be returned.

[0013]

As described above, according to the present invention, (1) local heating does not occur as compared with a conventional gun type burner or the like, and the life of the pot itself is extended. (2) The use of the surface combustion burner makes it easy to control the temperature without uneven heating. (3) The operating temperature of the molten metal can be controlled with high precision by a hot water pipe, and the molten metal in a large capacity pot can be made lower than the conventional melting and holding temperature, which leads to an improvement in fuel efficiency. (4) The molten metal can be pumped out until the liquid level of the molten metal in the pot reaches the height of the check valve. (5) Variations in the supply amount from the hopper due to fluctuations in the molten metal level can be prevented. (6) Hot water can be drained without tilting the entire apparatus.

[0014]

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating one embodiment of a light metal melting automatic hot water supply system according to the present invention.

FIG. 2 is a schematic structural explanatory view showing one embodiment of a conventional light metal melting automatic hot water supply system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Light metal melting automatic hot water supply system 11 Melting furnace 12 Pot 13 Quantitative supply means 13a Pump part 13b Stop valve 14 Hopper 15 Furnace main body 16 Surface combustion burner 17 Cover member 18, 26 Cylinder 19, 27 Valve body 20 Servo motor 21 Plug body 22 Suction Hole 23 ball 24 communication pipe 25 discharge hole 28 surface combustion burner 28a combustion surface 29 supply pipe 30 hot water supply pipe 31 shutter

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B22D 45/00 B22D 45/00 C (72) Inventor Jiro Takebe 1-5-20 Kaigan, Minato-ku, Tokyo No. Tokyo Gas Co., Ltd. (72) Inventor Hiroshi Takizawa 16-1 Higashimonmae, Omiya-shi, Saitama F-term (reference) 4E014 AA01 LA04 LA10 LA17

Claims (5)

[Claims] Claims 1. A light metal is melted, and a certain amount of molten metal is melted.
A hot water supply system that intermittently supplies a melting and holding furnace in which light metal is melted by a heating source and held at a melting and holding temperature; a fixed-quantity supply means for fixedly extracting molten metal from the melting and holding furnace; The hot water pipe for sending out the metal was provided with a heating source configured to raise the temperature to a higher use temperature as compared with the melting and holding temperature of the molten metal held in the melting and holding furnace, and to hold the temperature at the use temperature. An automatic hot water supply system for dissolving light metals. 2. A melting and holding furnace for accommodating a pot for holding a molten metal and having a furnace body having an inner space for heating the pot from the surroundings, and burning from a side wall of the furnace body to the pot in the inner space. 2. The light metal melting automatic hot water supply system according to claim 1, further comprising a surface combustion burner installed face-up, wherein a surface combustion burner is applied as a heating source in the hot water supply pipe. 3. The fixed-quantity supply means includes a pump unit for extracting a predetermined amount of molten metal from the molten metal in the pot in the melting and holding furnace, and a stop valve for shutting off a passage so that the molten metal extracted by the pump unit does not flow backward. The pump unit has a cylinder immersed in the molten metal in the pot, and a valve body that moves up and down in the cylinder, and a check valve for sucking the molten metal is provided at the bottom of the cylinder. A communication pipe for feeding molten metal to the stop valve side is communicatively connected to a side surface of the cylinder, and the stop valve has a cylinder mounted on an upper end of the communication pipe. A valve body for closing the passage of the molten metal fed into the hot water side, and a fixed amount of the molten metal is fed to the hot water pipe side by interlocking control of the pump and the valve body of the stop valve. 3. The automatic hot water dissolution apparatus according to claim 1, wherein the amount of the molten metal fed into the hot water supply pipe side is controlled by adjusting a stroke of a valve body in the cylinder while inserting the molten metal. system. 4. A hot water supply hopper for temporarily holding molten metal at a tip side of the hot water supply pipe, and a drip prevention means for molten metal to be supplied to the hot water supply hopper. The light metal melting automatic hot water supply system according to any one of 1 to 3 above. 5. A light metal melting automatic hot water supply according to claim 1, wherein a discharge hole for discharging molten metal in the hot water supply pipe is provided on a side surface of the cylinder. system.