JPH02127962A - Fixed molten metal surface temperature holding furnace - Google Patents

Abstract

PURPOSE:To improve holding accuracy of the fixed molten metal surface by detecting the molten metal surface in a dipping-out chamber, opening/closing a valve device in the dipping-out chamber and controlling the molten metal surface to the constant. CONSTITUTION:By opening the molten metal supplying valve, the molten metal in a molten metal temperature holding furnace flows into the pressurizing chamber 15 and gas in the pressurizing chamber 15 is exhausted from a hollow hole of a valve rod 20 in the molten metal supplying valve. The molten metal supplying valve device is closed. The valve device 27 is opened and the pressurized gas is supplied from a pressurized gas supplying device to push up the molten metal surface in the pressurized chamber 15 and the molten metal is supplied into the dipping-out chamber 33 through the pushing-up tube 36. When a molten metal surface sensor 41 works, the valve device 37 is closed to hold the fixed molten metal surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a constant drying surface heat retention furnace when an electromagnetic pump or a pneumatic water heater is used as a water heater for casting.

[Prior Art] As a conventional technology, there is a pressurized molten metal insulating furnace disclosed in Japanese Patent Application No. 61-265567, which will be explained with reference to FIG.

The pressurized molten metal heat retention furnace 50 consists of a closed pressurizing chamber 52 and an open pumping chamber 54 provided on the side thereof.
A discharge pipe 56 for supplying molten metal is attached to the upper part of the side wall of 4, and the molten metal is supplied to a die-casting machine or the like (not shown) via an electromagnetic pump 58 for pressure feeding.

A scene detector 53 is provided in the pumping chamber 54, and the detection signal activates the supply/exhaust system 55 provided at the upper part of the pressurizing chamber 52, so that the molten metal is supplied to a die-casting machine or the like by an electromagnetic pump. During this time, pressurized gas is introduced into the pressurized chamber via the air supply valve 57, and when replenishing molten metal into the pressure chamber, the pressurized gas in the pressure chamber is released via the exhaust valve 59. By maintaining the hot water level in the pumping chamber at a set level, it functions as a constant hot water level heating furnace.

[Problems to be Solved by the Invention] In such a conventional example, the upper partition wall 51 of the pressurizing chamber 52 is airtightly attached to the furnace body. , it is not easy to maintain airtightness.

Moreover, the pressurizing chamber is large in size to hold a large amount of molten metal, and the upper partition wall is also large, making it difficult to create an airtight structure, and a large amount of pressurized gas leaks, deteriorating the accuracy of maintaining a constant molten metal level. .

Therefore, an object of the present invention is to make the pressurizing chamber smaller, simplify the airtight structure, and further improve the accuracy of maintaining a constant molten metal level.

[Means for solving the problem] A molten metal insulating furnace that maintains a constant molten metal surface in a pumping chamber, comprising a pressurized chamber immersed in the molten metal at the bottom of the molten metal insulating furnace;
a molten metal supply valve device that is installed to penetrate the upper partition wall of the pressurizing chamber and allows the molten metal in the molten metal insulating furnace to flow into the pressurizing chamber; and a valve stem of the molten metal supply valve device that is a hollow member; a pressurized gas supply/discharge device configured to supply pressurized gas to and exhaust the pressurized gas from the lower end of the pressurized chamber; a pumping chamber open to atmospheric pressure installed in the upper part of the pressurizing chamber; A valve device is installed in a communication hole that penetrates the bottom wall of the pressurization chamber and communicates with the pressurization chamber, and communicates the pressurization chamber with the pumping chamber. It is provided with a push-up pipe to be joined and means for detecting the hot water level in the pumping chamber and controlling the hot water level at a constant level by opening and closing the valve device.

In addition, the pumping chamber has an airtight structure, and a pressurized gas constant supply device is installed and connected in the upper space of the pumping chamber, and after the valve device is closed, the pressurized gas constant supply device is operated to supply hot water in a fixed amount. shall be taken as a thing.

[Function] In the above configuration, the pressurizing chamber is relatively small enough to replenish the molten metal pumped out in one hot water supply cycle from the pumping chamber, and has an easy airtight structure, and is capable of supplying molten metal. The valve is opened to allow the molten metal in the molten metal insulating furnace to flow into the pressurizing chamber, and at the same time, the gas in the pressurizing chamber is exhausted from the hollow hole in the valve stem of the molten metal supply valve. Then, close the molten metal supply valve device. Next, the valve device is opened, pressurized gas is supplied from the pressurized gas supply/discharge device to press the molten metal surface in the pressurizing chamber, and molten metal is supplied to the pumping chamber through the push-up pipe. When the hot water level sensor is activated, the valve device is closed and a constant hot water level is maintained.

In addition, even when the pumping chamber has an airtight structure, the pumping chamber is relatively small enough to replenish the molten metal pumped out in one hot water supply cycle, and the airtight structure is easy to use. A fixed amount of hot water can be supplied by supplying a fixed amount of pressurized gas corresponding to the amount of hot water supplied in one hot water supply cycle from the fixed amount supply device.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIG. 1, IO is a molten metal insulating furnace, 12 is a water supply device using an electromagnetic pump, 13 is a heater, and 14 is molten metal in the molten metal insulating furnace.

Reference numeral 15 denotes a pressurized chamber, which is a closed box, and is located at the bottom 1 of the molten metal heat retention furnace.
It is installed at 6.

17 is a molten metal supply valve device, and a ceramic pipe 18
The lower end of the pressurizing chamber 15 passes through the upper partition wall and is fixed in a liquid-tight and air-tight manner. Reference numeral 19 denotes a molten metal inlet, which is bored in the ceramic pipe 18.

Reference numeral 20 denotes a hollow valve stem made of ceramics, the lower end of which is slidably fitted into the inner diameter of the ceramic pipe 18, and the figure shows a state in which the molten metal flow hole 19 is blocked by the valve stem 20. There is. A coupling 21 connects the valve stem 2o and the piston rod 22, and the valve stem 20 is slid up and down by an actuator 23 such as a pneumatic cylinder to open and close the molten metal flow port 19.

A solenoid valve 24 operates the actuator 23 such as the pneumatic cylinder.

A joint 25 is fitted onto the valve stem 20 and connected to a pressurized gas supply/discharge device 27 communicating with a hole 26 in the valve stem. 32 is a hollow hole in the valve stem 20.

28 is a pressurized gas source capable of supplying nitrogen gas as an inert gas. 29 is a pressure regulating valve, 30 is a pressure gauge, 3
1 is a solenoid valve that supplies and exhausts pressurized gas.

Reference numeral 33 denotes a pumping chamber, which is installed in the upper part of the pressurizing chamber 15 and communicates with a communicating hole 34 passing through the bottom wall through a push-up pipe 36 which has a valve seat 35 fixed thereto and is fitted into the pressurizing chamber 15. are doing.

37 is a valve device, 38 is a valve stem, 39 is a pneumatic cylinder, and 40 is a solenoid valve.

41 is a hot water level sensor, 41a is a holding level sensor, 41
b is an abnormal level sensor, and when the abnormal level sensor 41b is activated, the operation of the molten metal heat retention furnace IO is stopped.

A control device 42 detects the hot water level using the hot water level sensor 41 and controls the valve device 37 to open and close to maintain a constant hot water level.

43 is a hot water level sensor, 43a is an upper limit sensor, 43b is a lower limit sensor, and 43c is a ground electrode. When the lower limit sensor 43b detects the lower limit scene, the operation of the molten metal heat retention furnace is stopped.

44 is a discharge pipe connected to the suction port of the electromagnetic pump;
5 is an injection sleeve of the die-casting machine.

FIG. 2 shows another embodiment of the present invention, in which the pumping chamber 33 is made airtight with packings 46 and 47, and a pressurized gas constant supply device 48 is provided in the upper space of the pumping chamber 33. There is. The configuration other than this part is the same as in the case of FIG. 1, and the explanation will be omitted. The pressurized gas quantitative supply device 48 is composed of a pressure regulating valve 48a, a solenoid valve 48b, a gas temperature heating holder (not shown), etc., and is a device that supplies pressurized gas for a certain period of time using a timer. It is not limited to this example.

At all times, the hot water level in the pumping chamber 33 is maintained at the foot level, and during quantitative hot water supply, after closing the valve device 37, the pressurized gas constant supply device is operated to correspond to the amount of hot water supplied in - times of hot water supply cycle. By supplying a certain amount of pressurized gas, hot water can be supplied to the injection sleeve 45 with high quantitative accuracy.

[Effects of the Invention] As described above, by making the pressurizing chamber 15 smaller, it becomes easier to create an airtight structure, eliminates leakage of pressurized gas, improves the thermal efficiency of the molten metal insulation furnace, and improves the accuracy of holding the foot surface. can be done.

In addition, by making the pumping chamber of the foot holding furnace of the present invention an airtight structure and connecting it with a pressurized gas constant supply device, it is possible to supply hot water in a fixed amount with high quantitative accuracy.

4,

[Brief explanation of drawings]

FIG. 1 is a sectional view of a constant-molten-temperature insulating furnace showing one embodiment of the present invention, FIG. 2 is a sectional view of a constant-molten-temperature insulating furnace showing another embodiment of the present invention, and FIG. 3 is a sectional view of a conventional technology. It is a sectional view of a pressurized molten metal heat retention furnace showing an example. 10... Molten metal heat retention furnace, 15... Pressurizing chamber, 17...
Molten metal supply valve device, 20... valve rod, 27... pressurized gas supply/discharge device, 33...-pumping chamber, 36... push-up pipe. 37... Valve device, 42... Control device, 48...
- Pressurized gas constant supply device, 50...pressurized molten metal heat retention furnace. 52... Pressurization chamber, 54... Pumping chamber, 55... Supply/exhaust system, 57... Air supply valve, 59-... Exhaust valve.

Claims (2)

[Claims] (1) A molten metal insulating furnace that maintains a constant molten metal surface in a pumping chamber, which includes a pressurizing chamber installed at the bottom of the molten metal insulating furnace, and a pressurizing chamber installed through an upper partition wall of the pressurizing chamber, A molten metal supply valve device for causing molten metal in a molten metal heat retention furnace to flow into the pressurizing chamber, a valve stem of the molten metal supply valve device being a hollow member, and pressurized gas being supplied to the pressurizing chamber from the lower end of the valve stem. , a pressurized gas supply/discharge device configured to exhaust air; a pumping chamber open to atmospheric pressure installed at the top of the pressurizing chamber; A valve device attached to the communicating hole, a push-up pipe connected to the communicating hole from the bottom of the pressurizing chamber, and a hot water level in the pumping chamber are detected to open and close the valve device in the pumping chamber. 1. A constant hot water surface insulating furnace characterized by comprising means for controlling the hot water level to a constant level. (2) The pumping chamber according to claim 1 is made into an airtight structure, and a pressurized gas quantitative supply device is provided in the upper space of the pumping chamber and joined,
1. A fixed-molten-metal-surface heat-retaining furnace characterized in that, after closing the valve device of the pumping chamber, the pressurized gas quantitative supply device is operated to supply hot water in a constant amount.