JPH0635913B2 - Metal melting and holding furnace - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal melting and holding furnace for melting and holding a metal such as an aluminum alloy in the hand of a casting machine.

(Prior Art) Various metal melting and holding furnaces have been developed in the past, but there is room for improvement in terms of energy saving and space saving.

(Problems to be Solved by the Invention) An object of the present invention is to provide a metal melting and holding furnace that solves the above conventional problems and saves energy and space.

(Example) Hereinafter, a metal melting and holding furnace of the present invention will be described according to an example shown in the drawings.

1 to 4 show a metal melting and holding furnace of the present invention, which has a preheating chamber A which can be opened and closed by a door (3).

An auxiliary exhaust furnace (4) is introduced into the preheating chamber A, and the auxiliary exhaust passage
A temperature sensor (7) and a balance damper (5) are attached to (4).

On the other hand, the lower portion of the preheating chamber A is connected to a molten metal storage tank (22), and the molten metal storage tank (22) is connected to one end of a melting chamber B whose plane shape is formed in a substantially U shape.

The melting chamber B is provided with a burner (1) and one end of an exhaust passage (2) is guided.

Next, the other end of the melting chamber B is connected to the holding chamber C,
An immersion heater (11) is attached to the.

The holding chamber C is connected to an outlet D, and a level sensor (8) and a temperature sensor (12) are attached to the outlet D.

A partition (14) is provided between the melting chamber B and the holding chamber C, and a partition (15) is provided between the holding chamber C and the pumping port D.

Next, a controller (9) is provided, and the controller
(9) has the temperature sensor (7) and the level sensor (8) as inputs and the burner (1) as output.

Further, another controller (13) is provided, and the controller (13) uses the temperature sensor (12) as an input and the immersion heater (11)
Is output.

The operation of the metal melting and holding furnace of the present invention shown in the above embodiment will be described below.

That is, the door (3) is opened with the burner (1) in a low combustion state, and a material (20) such as an aluminum alloy block is put into the preheating chamber A.

As a result, the material (20) in the preheating chamber A rises in temperature and melts due to the burner (1) (the temperature sensor (7) detects the temperature decrease in the preheating chamber A and the combustion becomes high).

The resulting molten metal (21) is stored in the pumping port D from the melting chamber B through the holding chamber C.

The level of the molten metal (21) at the outlet D is a level sensor.
If it is detected by (8) and there is a risk that the level will rise and overflow from the pumping outlet D, the controller (9) will throttle the combustion amount of the burner (1).

Next, the temperature of the preheating chamber A is detected by the temperature sensor (7). When the material (20) in the preheating chamber A decreases due to melting and the temperature rises, the controller (9) causes the burner (1) to burn. The amount will be reduced to suppress useless combustion.

The molten metal (21) has its slag removed by the partition (14) and reaches the pumping port D and is pumped out.

On the other hand, the temperature of the molten metal at the pumping port D is detected by the temperature sensor (12), and the controller (13) controls the immersion heater (11) by the temperature to keep the temperature of the molten metal in the holding chamber C at a predetermined value. become.

Furthermore, the exhaust gas accompanying the combustion of the burner (1) is mainly discharged from the exhaust passage (2), but when the combustion amount is large, it is also discharged from the auxiliary exhaust passage (4) by opening the balance damper (5). Will be.

This means that when the combustion amount is small, the balance damper (5)
Exhaust (heating the upper surface of the molten metal (21) in the middle) is performed only from the exhaust passage (2) with the valve closed, and wasteful outflow of heat is suppressed.

(Effects of the Invention) The examples of the metal melting and holding furnace of the present invention are as described above, and the effects are listed below.

(1) The metal melting and holding furnace of the present invention has the structure described in claim 1, and in particular, the plan view of the melting chamber is substantially U-shaped, which saves space.

(2) The metal melting and holding furnace of the present invention has the structure described in the second aspect of the invention, and since it has the auxiliary exhaust passage equipped with the balance damper, heat is wasted even when the combustion amount is small. Outflow is suppressed and energy is extremely saved.

[Brief description of drawings]

 Fig. 1 is a plan view of a metal melting and holding furnace of the present invention. Fig. 2 is Fig. 1 II-II sectional view. Fig. 3 is the same as above III-III sectional view. Fig. 4 is the same as above IV-IV sectional view. 2 ... Exhaust passage 3 ... Door 4 ... Auxiliary exhaust passage 5 ... Balance damper, 7 ... Temperature sensor 8 ... Level sensor, 9 ... Controller 11 ... Immersion heater, 12 ... Temperature sensor 13 ...... Controller, 14 ...... Partitioner 15 …… Partitioner, 20 …… Material 21 …… Molten metal, 22 …… Melting tank A …… Preheating chamber, B …… Melting chamber C …… Holding chamber, D …… Pump outlet

Claims (2)

[Claims] 1. A preheating chamber into which materials are charged, an auxiliary exhaust passage guided to the preheating chamber and equipped with a temperature sensor, a molten metal storage tank connected to a lower portion of the preheating chamber, and the molten metal storage tank. A melting chamber which is connected to one end of the melting chamber and has a burner and an exhaust passage formed in a planar U-shape, a holding chamber to which the other end of the melting chamber is connected and an immersion heater is attached, and the holding chamber Metal melting and holding furnace consisting of a spout connected to the 2. A preheating chamber into which materials are charged, an auxiliary exhaust passage guided to the preheating chamber and equipped with a temperature sensor and a balance damper, a molten metal storage tank connected to a lower portion of the preheating chamber, and the molten metal. From a melting chamber in which a storage tank is connected to one end thereof and a burner and an exhaust passage are provided, a holding chamber in which the other end of the melting chamber is connected and an immersion heater is mounted, and a pumping outlet connected to the holding chamber. Metal melting and holding furnace