JPH0623655U - Automatic water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To realize an automatic water heater that can reliably detect the molten metal surface. [Structure] The automatic hot water supply device 1 is provided with molten metal level detection rods 5 and 6 having different lengths. Since the molten metal level detecting rods 5 and 6 are insulated by the bushes 5b and 6b, respectively, the liquid level is detected only when the molten metal level detecting rods 5 and 6 are both immersed in the conductive material. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic water heater for supplying molten metal to, for example, a die casting machine.

[0002]

[Prior art]

 As is well known, in the manufacturing process of castings, an automatic water heater for scooping and pouring molten metal into a mold is used. FIG. 2 is a plan view showing a schematic configuration of a general automatic water heater 1. In this figure, reference numeral 2 is an arm of the automatic water heater 1, which is vertically and horizontally operable. A hot water supply ladle 3 for scooping the molten metal is attached to the tip of the arm 2. Next, details of the arm 2 and the hot water supply ladle 3 of the automatic hot water supply device 1 will be described with reference to FIG.

A hot water supply ladle 3 shown in FIG. 3 is provided with a joint portion 3 a that is rotatable with respect to the arm 2, and its shape is a bowl shape suitable for scooping molten metal. Further, 5 and 6 are respectively molten metal level detection rods. The molten metal level detection rods 5 and 6 are attached along the longitudinal direction of the arm 2 via a support member 2a. The molten metal level detection rod 6 is directly connected to the support member 2a, and thus becomes the ground side. On the other hand, the level detecting rod 5 is fixed to the support member 2a via a bush 5b made of an insulating material such as Mycarex, and the base end of the detecting rod 5 is connected to the positive side of the automatic water heater 1. .

Below the arm 2 to which the molten metal surface detection rods 5 and 6 are attached, a hand-held furnace (not shown) for storing the molten aluminum supplied from the main furnace is provided. Here, for example, when the arm 2 is actuated downward to scoop the molten metal, first, the tip portion 5a of the molten metal surface detection rod 5 is dipped in the molten aluminum in the manual furnace. At this time, the tip 5a is supplied with the detection voltage from the main body of the automatic water heater 1 (see FIG. 4). Next, when the hot water supply ladle 3 performs the operation of scooping the molten metal, the front end portion 6a of the molten metal surface detection rod 6 is immersed in the molten metal at this time. Therefore, the current I flows from the molten metal level detection rod 5 to the molten metal level detection rod 6 through the molten aluminum. As a result, the relay CR shown in FIG. 4 is turned on. As a result, it is detected that the tip of the arm 2 has reached the molten metal surface.

In this way, when the hot water supply ladle 3 reaches the vicinity of the liquid surface, the hot water supply ladle 3 makes a rotary motion with the joint 3a as a fulcrum to scoop out the molten aluminum. Then, the molten metal is poured into a mold provided at a predetermined position and casting is performed. The manufacturing process of castings using this kind of mold is generally used, for example, in the manufacturing stage of engines such as automobiles.

[0006]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional automatic hot water supply apparatus, the bush 5b is attached only to the molten metal level detecting rod 5 and is insulated from the arm 2 side. This causes the inconvenience described below. Assuming that one cycle is a series of operations consisting of detecting the molten metal surface, pumping the molten metal, and pouring it into the mold, the molten metal surface detection process is carried out each time one casting is manufactured in the actual work. Therefore, since the tip of the arm 2 is repeatedly immersed in the molten aluminum and pulled up, the droplets of the molten metal adhering to the surface level detection rods 5 and 6 and the hot water supply ladder 3 solidify into an icicle. Will be formed. When such an icicle-like deposit grows, even if the icicle-like deposit is actually separated from the molten metal surface, the icicle-like deposit contacts the molten metal, and it is as if the level detecting rod 5 and the hot water supply line It is possible that the dollar 3 and the dollar 3 are both detected as if they were immersed in the molten aluminum. In this case, since there is no insulator between the molten steel level detection rod 6 and the arm 2 including the hot water supply ladle 3, they are electrically connected. For this reason, the electric current I supplied from the automatic water heater 1 passes through the path of the molten metal level detection rod 5 → the molten metal → the hot water supply ladle 3 and is energized. When the molten metal pumping operation is performed in such a false detection situation, the required amount of aluminum molten metal cannot be pumped into the hot water supply ladle 3 and the molten aluminum is idle. In such cases, the casting process continues to operate without the required amount of molten aluminum being obtained, which causes problems such as bending of the injection lot.

Further, an aluminum piece obtained by solidifying the molten aluminum rarely floats on the molten aluminum. Then, as shown in FIG. 5A, it is assumed that when the tip of the ladle 3 is immersed in the molten metal, the aluminum piece 7 adheres between the hot water supply ladle 3 and the molten metal surface detection rod 5. In this case, the electric current I supplied from the automatic hot water supply device 1 is passed through the hot water level detection rod 5 → the aluminum piece 7 → the hot water supply ladle 3 (see FIG. 5 (b)). Then, also in this case, the relay CR is turned on, and erroneous detection is performed as in the case of the above-mentioned "icicle". As described above, the conventional automatic hot water supply device 1 has a problem that the above-described "turning circuit" is formed, and erroneous detection easily occurs. The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to realize an automatic hot water supply device that can reliably detect a molten metal surface.

[0008]

[Means for Solving the Problems]

 The automatic water heater according to the present invention is equipped with first and second detection rods for detecting the position of the surface of the conductive molten metal, and the first and second detection rods, for pumping the conductive molten metal. In an automatic hot water supply device including an arm to be operated, the automatic water heater has an insulating means for electrically insulating the first and second detection rods from the arm, and the first detection rod is provided with the second detection rod. It is characterized in that it is provided closer to the molten metal surface position than the detection rod.

[0009]

[Action]

 According to the above configuration, first, the tip portion of the first detection rod is immersed in the conductive molten metal by operating the arm. Next, the second detection rod is also immersed in the molten metal. Here, since the insulating means electrically insulates the first and second detection rods from the arm, the current supplied from the main body of the automatic water heater does not change from the first detection rod to the conductive one. Molten metal → electricity is passed through the path of the second detection rod. Therefore, it is possible to reliably detect the position of the molten metal surface.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are a diagram and a circuit diagram, respectively, showing a schematic configuration of an automatic water heater 1 according to an embodiment of the present invention. In this figure, the same parts as those shown in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. The point that the automatic water heater 1 shown in this figure is different from that shown in FIG. 3 is that a bush 6b is provided between the molten metal level detection rod 6 and the support member 2a, so that the arm 2 is electrically insulated. In particular (see Fig. 1 (b)). The bush 6b is formed of an insulator such as Mikelex, like the bush 6a described above.

According to such a configuration, for example, even if the aluminum piece 7 comes into contact between the molten metal level detection rod 5 and the hot water supply ladle 3, the arm 2 is not grounded. Is not formed, and false detection does not occur. That is, there is no interference from the arm 2 as in the conventional case. Therefore, since the detection current I is not supplied to the ground of the main body of the automatic water heater 1, the relay CR remains in the off state. Therefore, the process of pumping the molten aluminum is not executed, and the scooping of the hot water supply ladle 3 can be prevented. Further, as described above, even when a "icicle-shaped" attachment is formed on the molten metal level detecting rod 5 and the hot water supply ladle 3, since the molten metal level detecting rod 6 is not electrically connected to the arm 2, No false positives will occur. As a result, it is possible to prevent the trouble such as the bending of the injection lot due to the idle driving of the hot water supply ladle 3 as in the conventional case.

[0012]

[Effect of device]

 As described above, according to the present invention, the automatic water heater 1 is equipped with the first and second detection rods for detecting the surface position of the conductive molten metal, and the first and second detection rods. An arm for pumping up the conductive molten metal, and an insulating means for electrically insulating the first and second detection rods from the arm. Since it is provided closer to the molten metal surface position than the second detection rod, there is an effect that it is possible to realize an automatic water heater that reliably detects the molten metal surface.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an automatic water heater according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of a general automatic water heater.

FIG. 3 is a plan view showing a configuration of a molten metal surface detection mechanism portion in a conventional automatic hot water supply device.

FIG. 4 is a circuit diagram showing a circuit configuration of the molten metal surface detection mechanism section.

FIG. 5 is a diagram for explaining a molten metal surface detection operation in a conventional automatic water heater.

[Explanation of symbols]

 1 ... Automatic hot water supply device 3 ... Hot water supply ladle 5 ... Hot water level detection rod (first detection rod) 6 ... Hot water level detection rod (second detection rod) 5b, 6b ... Bush (insulating means)

Claims (1)

[Scope of utility model registration request] 1. A first device for detecting a molten metal surface position of a conductive molten metal.
An automatic hot water supply device comprising: a second detection rod; and an arm to which the first and second detection rods are attached and which pumps up the conductive molten metal, wherein the first and second detection rods and the arm are provided. An automatic water heater having an insulating means for electrically insulating between the first and second detecting rods, the first detecting rod being closer to the molten metal surface position than the second detecting rod.