JPH0114392Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is based on the method of receiving molten metal for casting intermittently from a holding furnace, pressurizing the received molten metal with air pressure, and moving it from the tapping section. This invention relates to a pressurized pouring machine for casting that dispenses hot water in fixed quantities.

(Prior Art) The pressurized pouring machine as described above is generally known (see, for example, Japanese Utility Model Application Publication No. 154671/1983).

The pressurized pouring machine maintains a pressurizing chamber for pressurizing molten metal within a predetermined range at a set pressure base pressure, and taps the hot metal by applying shot pressure. Also, when receiving hot water, the base pressure in the pressurizing chamber increases due to the high temperature of the molten metal, so a load cell that detects weight is used to detect the receiving metal, and an exhaust valve connected to the pressurizing chamber is opened to the atmosphere. The base pressure is maintained within the set range.

However, when the receiving and dispensing of hot water overlap, as shown in FIG. 1, the amount of hot water dispensed is greater than the amount of received hot water, so the pouring machine becomes lighter, and the load cell detects the weight reduction A and does not detect the received hot water. For this reason, the exhaust valve is not opened and the pressure in the pressurizing chamber increases due to the temperature rise of the molten metal.

As a result, the amount of hot water dispensed becomes unstable, requiring manual operations to constantly pour a stable amount of hot water, which reduces work efficiency, and increases the pressure in the pressurized chamber mentioned above. If the pouring machine exceeds the limit, the safety device of the pouring machine is activated and stops the pouring operation, and based on this stoppage, the casting line is also stopped, resulting in large work losses. Moreover, since excess molten metal is discarded, there are problems such as extremely large losses of materials and energy.

(Purpose of the invention) The purpose of this invention is to develop a pressurized pouring machine for casting that can maintain the pressure in the pressurizing chamber at a predetermined value and keep the amount of hot water constant even when receiving and pouring metal overlap. It's on offer.

(Structure of the invention) According to this invention, it is a pressurized pouring machine for casting that directly detects the intermittent discharge of metal from the holding furnace with a detector, and controls the opening of the exhaust valve of the pressurizing chamber based on this detection signal. It is characterized by

(Effect of the invention) According to this invention, even if hot water intake and hot water dispensing overlap,
By directly detecting the hot water coming out of the holding furnace, the hot water in the pouring machine can be reliably detected even when the hot water is being tapped.
By using this detection signal to control the opening of the exhaust valve in the pressurizing chamber, the pressure in the pressurizing chamber is corrected and the pressurizing chamber is maintained at a predetermined pressure even during hot water dispensing, and the amount of hot water is stabilized. Overflow is reliably prevented, and the above-mentioned problems caused by instability of the amount of hot water coming out and overflow are solved.

(Example) An example of this invention will be described in detail below based on the drawings.

The drawing shows a pressurized pouring machine for casting, and in FIG. When the cylinder 4 is operated, molten metal is intermittently tapped from the tapping section 5.

Further, this holding furnace 2 is equipped with a holding furnace tapping detector 6 which is constituted by a phototube that detects the molten metal being tapped by the tapping section 5 and outputs a detection signal.

The pressurized pouring machine 7 is composed of a hot water receiving part 8, a storage part 9, a pressurizing chamber 10, and a hot water tapping part 11, and is mounted on load cells 12, 12 that detect the weight and output a signal. In addition, the above-mentioned molten metal receiving section 8 is connected to the holding furnace 2 in the previous stage.
The storage section 9 receives the molten metal that is dispensed more intermittently.
holds the molten metal, the pressurizing chamber 10 applies normal base pressure to the held molten metal to control this pressure, further applies shot pressure at the time of tapping, and the tapping section 11 taps the molten metal from the storage section 9.

A pressure regulating valve 14 and an exhaust valve 15 are connected to the above-mentioned pressurizing chamber 10 via a passage 13, and the pressure regulating valve 14 is connected to a pressure source 16 such as a compressor, so that the compression chamber 10 is Air is supplied to the pressurizing chamber 10 in accordance with the base pressure and the shot pressure based on the base pressure signal output when the weight of the load cells 12, 12 changes and the shot signal output when hot water is tapped.

The above-mentioned exhaust valve 15 is composed of a solenoid-operated spring return type two-position switching valve, which normally closes the passage 13 and closes the passage 13 by operating the solenoid upon detection of hot water by a holding furnace hot water detector, which will be described later.
is opened to the atmosphere, and an increase in air pressure in the pressurizing chamber 10 is suppressed.

The lower part of the pouring pot 17 is tiltably supported by a support member 18, and a cylinder 19 is connected to receive the molten metal discharged from the pouring machine 7 in the previous stage, and the cylinder 19 is operated. The molten metal is poured from the tapping section 20 into the mold flowing on the line.

The pressurized pouring machine 7 configured in this way has a tapping section 1.
1, when the molten metal is received from the holding furnace 2 into the molten metal receiving section 8, the amount of molten metal released is usually larger than the amount of molten metal received, so the load cells 12, 12 detect the weight loss and increase the pressure. The regulating valve 14 is controlled to apply a predetermined base pressure. However, unless the exhaust valve 15 is opened, the pressure in the pressurizing chamber 10 cannot be prevented from increasing due to the incoming hot water.

On the other hand, the hot water coming out detector 6 of the holding furnace 2 detects the hot water coming out of the holding furnace 2, and this detection corresponds to the detection of the hot water being received by the pouring machine 7. Based on the detection signal, the exhaust valve 1
Operate solenoid No. 5 to switch this to passage 1.
3 is opened to the atmosphere, and this pressurized chamber 10 is heated by receiving hot water.
Correct the pressure so that the air pressure does not increase.

As a result, the amount h of molten metal in the tapping section 11 is maintained within a predetermined range.

Note that when the pouring machine 7 does not dispense hot water and only receives hot water, the weight of the pouring machine 7 increases in proportion to the amount of hot water received, so the load cells 12, 12 detect this and output a base pressure signal. The pressure regulating valve 14 is controlled to lower the base pressure. At the same time, since the hot water detector 6 detects the hot water coming out of the holding furnace 2, the exhaust valve 15 is also operated and opened, thereby suppressing the pressure rise in the pressurizing chamber 10.

The control circuit that opens the exhaust valve 15 in the above embodiment is a solenoid that operates the exhaust valve 15.

Furthermore, although the hot water detector 6 is constituted by a phototube, it may be constituted by any other detection means as long as it is capable of detecting the hot water discharged from the holding furnace 2.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the output state of a load cell during conventional hot water tapping. FIG. 2 is a partial cross-sectional view of a pressurized pouring machine showing an embodiment of this invention. DESCRIPTION OF SYMBOLS 1...Kyupora, 2...Holding furnace, 6...Made-out metal detector, 7...Pressure type pouring machine, 8...Mold receiving part, 10
...pressure chamber, 11... hot water outlet, 15... exhaust valve.

Claims (1)

[Scope of Claim for Utility Model Registration] Molten metal is intermittently received from a holding furnace that is continuously supplied with molten metal from Kyupora, and the received molten metal is pressurized by air pressure and tapped in a predetermined amount from a tapping section. The pressurized pouring machine is configured to discharge hot water from the tapping section even while receiving hot water from the holding furnace, the pressurized pouring machine comprising: a weight detector for detecting the weight of the tapping machine; A pressure regulating valve that supplies base pressure to the pressurizing chamber of the pouring machine in response to a signal from the weight detector and further applies shot pressure during tapping; and An exhaust valve for pressure correction that can release air from the pressurization chamber to the atmosphere to prevent the pressure in the pressurization chamber of the machine from rising, and a holding furnace that directly detects intermittent hot water discharge from the holding furnace. A pressurized pouring machine for casting, which is equipped with a hot water detector and a control circuit that opens the exhaust valve based on a detection signal from the detector.