JPH0810937A - Device for pouring molten non-ferrous metal of constant amount - Google Patents

Abstract

PURPOSE:To reduce the cost by providing a rod-shaped sensor for detecting the surface of the molten metal, a valve rod or the like, and the inlet and outlet ports of the gas on a lid, and connecting a vacuum generating device or the like thereto to dispense with the air-tight constitution of a furnace body. CONSTITUTION:A molten metal inlet valve 6 is opened to open a valve 21 of a vacuum generating device 16. This flows the molten metal into a pressure chamber 4. An inlet valve 18 is opened, and the pressure chamber 4 is evacuated by the vacuum generating device 16, and the molten metal is poured until the molten metal surface is detected by a molten metal full pouring detecting rod-shaped sensor 11. After the pouring is completed, the inlet valve 18, the molten metal inlet valve 6 and a shut-off valve 21 are closed. A molten metal discharge valve 8 and a pressure valve 25 are opened, an the pressure chamber 4 is pressurized with the gaseous nitrogen to pour the molten metal into a casting machine through the discharge valve 8. When the rod-shaped sensor 12 is off the molten metal surface, the discharge valve 8 and the pressure valve 25 are closed to complete the pouring of the constant amount. The molten metal of the constant amount can be poured every time from the pressure chamber to the casting machine or the like with excellent precision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantitative pouring device for automatically quantitatively supplying a molten nonferrous metal from a container such as a molten metal holding furnace for storing the molten nonferrous metal to a casting machine.

[0002]

2. Description of the Related Art Conventionally, various kinds of quantitative pouring devices for molten non-ferrous metal have been known. For example,
In Japanese Patent Publication No. 51-36704, the lower part of the molten metal discharge pipe is immersed and charged into the molten metal in the furnace having the functions of melting, heat retention and pressure pouring, and the pressurized gas is supplied to the furnace to push down the molten metal surface. Therefore, there has been proposed a device for quantitatively pouring the molten metal in the furnace through a molten metal discharge pipe into a casting machine or the like.

Further, Japanese Patent Publication No. 62-32020 discloses a melting and heat-retaining unit as well as a quantitative pouring apparatus using a pressure pouring unit, and a furnace having only a melting and heat-retaining unit. There has been proposed a quantitative pouring device (see FIGS. 1 to 3 of the publication) in which a pressurized pouring portion is provided by immersing the pressurized pouring portion in the molten metal from outside the furnace.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 51-36704
The quantitative pouring device proposed in the publication has a structure in which the lower part of the molten metal discharge pipe is immersed and discharged into the molten metal in the furnace, and the surface of the molten metal flows in unlike the overflow type and pumping type etc. Although it is possible to prevent scum from mixing in, the pouring amount is determined by the pressurizing force of the gas supplied to the furnace and the timer. Although it has a correction mechanism that accompanies the surface variation, the correction cannot be said to have sufficient accuracy because it controls the gas pressure. In addition, if you want to change to a different kind of molten metal, it is necessary to treat the residual molten metal in the furnace, which cannot be easily changed, and it is difficult to completely treat the residual molten metal without leaving the residual molten metal on the bottom of the furnace. Affect.

Further, in the quantitative pouring device proposed in Japanese Patent Publication No. 62-32020, in the case of a quantitative pouring device using a furnace having a pressurizing pouring unit integrated with a melting and heat-retaining unit, pressurizing pouring is performed. The molten metal part can be compactly constructed in the lower part of the furnace to prevent mixing of scum and the like, and the accuracy of the molten metal can be expected relatively, while the pressurized molten metal part is melted and integrated with the heat retaining part, so It is difficult to repair when troubles such as leakage occur. In addition, if you want to change to a different kind of molten metal, it is necessary to treat the residual molten metal in the furnace, which cannot be easily changed, and it is difficult to completely treat the residual molten metal without leaving the residual molten metal on the bottom of the furnace. Affect.

On the other hand, in the case of a fixed quantity pouring device having a structure in which a pressurized pouring part is immersed in the molten metal in the furnace from outside the furnace in a furnace having only melting and heat retaining parts, scum and the like can be prevented from being mixed. If a trouble such as pressure leak occurs, it can be done by replacing only the pressurized pouring part, and if you want to change to a different type of molten metal, prepare a furnace of the same type and move only the pressurized pouring part. On the other hand, it has an advantage, but since the rising pipe for discharging the molten metal from the pressurizing chamber is long, the pouring accuracy becomes worse than the above case, and when changing to a different kind of molten metal, the residual molten metal is left at the bottom of the pressurized pouring part. It is difficult to completely treat the metal without leaving it, which affects the quality of the different molten metal. In addition, the internal structure of the pressurizing and pouring section is complicated and the manufacturing cost is high.

The present invention has been made in view of the above circumstances, and an object thereof is to easily attach to and detach from the container and to easily treat the residual hot water regardless of the form of the container for storing the molten metal. In addition, the present invention provides a quantitative pouring device for molten non-ferrous metal with high precision in pouring amount.

[0008]

In order to achieve the above object, a quantitative non-ferrous metal melt pouring apparatus according to the present invention is detachably attached to a container for storing non-ferrous metal melt so that the molten metal in the container can be removed. A device for pouring a fixed amount of water into a casting machine or the like,
A melt inlet valve is provided at the bottom of the tubular body, a melt discharge valve is provided outside the middle abdomen, and a lid is provided at the top to form a pressure chamber, and a rod-shaped sensor for detecting the molten metal is provided on the lid, and a valve rod for the melt inlet valve. The opening / closing mechanism is provided, a gas inflow port is further formed, and a vacuum generator provided with a pressure adjusting mechanism and a compressed gas source are connected to the inflow port.

The rod-shaped sensor for detecting the molten metal surface may be at least two sensors for the molten metal surface and for setting the molten metal amount.

Further, a heating device may be provided on the outer peripheral surface of the upper part of the tubular body and on the outer peripheral surface of the molten metal discharge valve up to the molten metal discharge valve.

[0011]

In the above-mentioned metered pouring device of the present invention, the lower part of the tubular body is immersed in the molten metal of the container, the molten metal discharge valve is located on the furnace lid, and the pressure chamber is provided on the furnace lid or the like. In addition to the melting furnace, the holding furnace, etc., it is not necessary to apply gas pressure to the furnace itself, so that the furnace body does not need to be airtightly structured, and the cost can be reduced. Moreover, the existing holding furnace and the like can be easily converted into an automatic pouring furnace. Further, the pressure chamber has a structure that can be detachably attached to the furnace lid and the like with bolts and the like, and the molten metal inlet valve is provided at the bottom of the tubular body. Opening allows the residual hot water in the pressure chamber to be easily discharged, and it is extremely easy to change to a different molten metal.

Further, the pouring amount is determined by the product of the amount of lowering of the molten metal position detected by the molten metal detecting rod-shaped sensor and the cross-sectional area of the tubular body. It is possible to accurately perform fixed amount pouring every time. Further, the detection of the drop amount can be performed with relatively simple accuracy, for example, by the simplest structure in which at least two rod surface detecting rod-shaped sensors for detecting the molten metal surface completion position and the fixed amount discharge position in the pressure chamber are provided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional explanatory view of a non-ferrous metal melt quantitative pouring device according to the present invention. In this embodiment, the quantitative pouring device 1 is shown.
Is installed on the furnace lid 3a of the opening 3 of the holding furnace 2.

The pressure chamber 4 of the quantitative pouring device 1 has a tubular body 5
Is provided with a melt inlet valve 6 at the bottom, a melt discharge valve 8 at the tip of the discharge pipe 7 outside the middle abdomen, and a lid 9 at the top. Then, the lid 9 is inserted into the through hole, and the molten metal detection valve sensor 10, the molten metal completion detection rod sensor 11, the molten metal amount setting detection rod sensor 12, and the opening / closing air cylinder 13 are provided together with the molten metal inlet valve. 6 valve rods 14 are provided respectively, and pipe lines 15 for supplying and discharging gas to and from the pressure chamber 4 are connected to the further through holes.

A vacuum generator 16 and a nitrogen cylinder 17 are connected to the pipe 15 via a branch pipe. In this example, as the vacuum generator 16, an ejector type that reduces the pressure in the pressure chamber 4 connected by blowing out compressed air is adopted, and an inlet valve 18 is provided on the compressed air inlet pipe side of the vacuum generator 16. An inlet pressure gauge 19, a silencer 20 on the discharge side, a shutoff valve 21, a filter 22, and a compound gauge 23 on the vacuum piping side are respectively provided. On the other hand, a pressure setter 24, a pressurizing valve 25, and a pressure gauge 26 are provided between the nitrogen cylinder 17 and the branch pipe. The nitrogen cylinder 17 is used as an example of a working fluid that pressurizes the pressure chamber 4, and an inert gas or the like is used in addition to nitrogen to prevent the molten metal from being oxidized.

A compressed air pipe 28 is connected via an electromagnetic valve 27 to the air cylinder 13 for opening / closing (elevating) the valve rod 14 of the molten metal inlet valve 6.

Further, the molten metal discharge valve 8, the molten metal detection rod-shaped sensor 10, the molten metal surface completion detection rod-shaped sensor 11, the pouring amount setting detection rod-shaped sensor 12, the inlet valve 18, the shutoff valve 21, the compound meter 23, Each of the pressurizing valve 25 and the solenoid valve 27 is connected to the controller 29.

Reference numeral 30 is a bellows provided between the flange of the valve rod 14 and the lid 9 for improving the airtightness of the penetrating portion of the lid 9 of the valve rod 14. Further, reference numeral 31 is a heating device provided on the outer circumference of the tubular body 5 located on the furnace lid 3a, and reference numeral 32 is heating provided on the outer circumference of the discharge pipe 7 and the molten metal discharge valve 8 exposed on the furnace lid 3a. The heating devices 31 and 32 are provided as a more preferable embodiment, and heat the upper part of the tubular body 5, the discharge pipe 7 and the molten metal discharge valve 8 in the initial stage of pouring, and additionally, the heating device 31 and 32 are internally provided for each pouring process. If the remaining molten metal is solidified, it can be prevented and the molten metal can be poured smoothly.

Next, the procedure for pouring by the fixed quantity pouring device 1 having the above-mentioned structure will be described. : Set the fixed quantity pouring device 1 to the state shown in Fig. 1, and set the rod surface detecting rod sensor 11 and the pouring amount setting rod sensor 12 to the positions corresponding to the pouring amount which is grasped in advance. If so, put the heating devices 31, 32 into the tubular body 5.
The upper part, the discharge pipe 7 and the melt discharge valve 8 are heated.

Next, the solenoid valve 27 is switched to drive the air cylinder 13 upward to open the melt inlet valve 6 and the shutoff valve 21 of the vacuum generator 16. As a result, the molten metal of the holding furnace 1 flows into the pressure chamber 4, and the molten metal surface becomes the same as the molten metal surface of the holding furnace 1.

After this, the inlet valve 18 is opened and the vacuum generator 16 is operated to evacuate the inside of the pressure chamber 4 and the molten metal is poured to the completion position detected by the rod surface completion detecting rod-shaped sensor 11. When the rod-shaped sensor 11 for detecting the completion of the molten metal surface detects the molten metal surface, the inlet valve 1
8. Close the melt inlet valve 6 and the shutoff valve 21 respectively.

Next, when the molten metal discharge valve 8 and the pressurizing valve 25 are opened, the pressure chamber 4 is pressurized with nitrogen gas and the molten metal is poured through the molten metal discharge valve 8 into a casting machine or the like. In accordance with this pouring, when the molten metal surface in the pressure chamber 4 is lowered and the molten metal pouring amount detecting rod sensor 12 is cut off from the molten metal surface, the molten metal discharge valve 8 and the pressurizing valve 25 are closed to complete the quantitative pouring.

When the pouring is further repeated, the above-mentioned operations (1) to (5) are repeated, so that the pouring can be performed with little variation in the pouring amount at each time.

In this embodiment, since nitrogen gas is pressurized during pouring, the pouring time can be shortened, and the amount of residual molten metal after pouring the molten metal discharge valve 8 can be reduced to prevent the molten metal from dripping. .

[0025]

As described above, in the non-ferrous metal molten metal pouring device according to the present invention, the lower portion of the tubular body is immersed in the molten metal of the container, and the molten metal discharge valve is located on the furnace lid. Since the pressure chamber can be installed on the furnace lid or the like, it can be installed regardless of the form of the container such as a melting furnace or a holding furnace. Also,
Since no gas pressure is applied to the furnace itself, it is not necessary to make the furnace body airtight, and the cost can be reduced. Moreover, the existing holding furnace and the like can be easily converted into an automatic pouring furnace. Furthermore, the structure is such that the pressure chamber can be detachably attached to the furnace lid, etc. with bolts, etc., and since the molten metal inlet valve is provided at the bottom of the tubular body, the pressure chamber can be removed from the furnace lid, etc. Opening allows the residual hot water in the pressure chamber to be easily discharged, and it is extremely easy to change to a different molten metal. Furthermore, since the pouring amount is determined by the product of the amount of lowering of the molten metal position detected by the molten metal level detecting rod-shaped sensor and the cross-sectional area of the tubular body, the amount of molten metal poured from the pressure chamber to the casting machine etc. The fixed quantity pouring of can be performed accurately.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a non-ferrous metal melt quantitative pouring device according to the present invention.

[Explanation of symbols]

1: Fixed amount pouring device 2: Holding furnace
3: Opening 3a: Furnace lid 4: Pressure chamber
5: Tubular body 6: Molten metal inlet valve 7: Discharge pipe
8: Molten metal discharge valve 9: Lid 10: Molten metal detection rod-shaped sensor 11: Molten metal end detection rod-shaped sensor 12: Molten metal amount setting detection rod-shaped sensor 13: Open / close air cylinder 14: Valve rod 1
5: Pipe line 16: Vacuum generator 17: Nitrogen cylinder 1
8: Inlet valve 19: Inlet pressure gauge 20: Silencer 2
1: Shut-off valve 22: Filter 23: Combined total 2
4: Pressure setting device 25: Pressurizing valve 26: Pressure gauge 2
7: Solenoid valve 28: Compressed air pipe 29: Controller 3
0: Bellows 31, 32: Heating device

Claims (3)

[Claims] 1. A device for detachably attaching to a container for storing molten non-ferrous metal, for pouring a fixed amount of the molten metal in a container to a casting machine or the like, which comprises a molten metal inlet valve at the bottom of a tubular body and a middle abdomen. A melt discharge valve is provided on the outside and a lid is provided on the upper part to form a pressure chamber, and a rod-shaped sensor for detecting a molten metal surface, a valve rod for the molten metal inlet valve, and an opening / closing mechanism for the molten metal are provided on the lid. A quantitative pouring device for molten non-ferrous metal, which is formed by connecting a vacuum generator having a pressure adjusting mechanism and a compressed gas source to the outflow inlet thereof. 2. The quantitative pouring device for molten non-ferrous metal according to claim 1, wherein the rod-shaped sensor for detecting the molten metal surface is provided with at least two sensors for the molten metal surface and for setting the amount of molten metal. 3. The quantitative pouring device for molten non-ferrous metal according to claim 1, wherein a heating device is provided on the outer peripheral surface of the upper part of the tubular body and the outer peripheral surface of the molten metal discharge valve up to the molten metal discharge valve.