Casting device

Abstract

The present invention provides a casting device that takes an electromagnetic pump as a main element, and has a molten metal leakage detection mechanism and a heater in a manner of surrounding the outer circumferential surface of the upper portion of a nozzle on the upper portion of the electromagnetic pump, in which the detection accuracy of molten metal leaking between the nozzle and a feeder thereon is high, and the leaked molten metal does not reach or is difficult to reach the heater. The molten metal leakage detection mechanism (40) is composed of a first electrode plate (41), a first insulating plate (42) arranged below the first electrode plate, a second electrode plate (43) arranged below the first insulating plate, a second insulating plate (44) arranged below the second electrode plate, a sensor (45) that detects whether the first electrode plate and the second electrode plate are electrically conducted, and a flange portion (48) that horizontally extends from the outer circumferential surface of the nozzle (28). The first electrode plate, the first insulating plate, and the outer circumferential surface of the nozzle have a prescribed gap therebetween, and the second electrode plate and the second insulating plate extend in a manner of contacting the outer circumferential surface of the nozzle.

Description

TECHNICAL FIELD

[0001] The present application relates to a casting device that takes an electromagnetic pump as a main constituent element. BACKGROUND

[0002] An electromagnetic pump that draws and discharges molten metal by electromagnetic induction has been put into practical use. Also, a casting device that takes an electromagnetic pump as a main constituent element is known (for example, refer to Patent Literature 1).

[0003] The pump shaft of the electromagnetic pump described in Patent Literature 1 is inclined, but an electromagnetic pump in which the pump shaft is vertical has also been put into practical use.

[0004] Based on Figure 5 An electromagnetic pump in which the pump shaft is vertical will be described.

[0005] That is, as Figure 5 illustrated, a conventional casting device 100 takes an electromagnetic pump 102, a feeder 103, and a mold 104 as main constituent elements.

[0006] Further, the electromagnetic pump 102 has a nozzle 101 at an upper portion. The feeder 103 is disposed above the nozzle 101. The mold 104 is disposed above the feeder 103.

[0007] By electromagnetic induction, molten metal 105 is drawn. The molten metal 105 is injected into a cavity 106 of the mold 104 via the nozzle 101 and the feeder 103.

[0008] Figure 5 The 6 parts of the enlarged view are shown in Figure 6 .

[0009] As Figure 6 illustrated, a joint of the nozzle 101 and the feeder 103 is sealed by a seal 107.

[0010] A molten metal leakage detection mechanism 110 is disposed in a manner of surrounding an outer peripheral surface of an upper portion of the nozzle 101.

[0011] The molten metal leakage detection mechanism 110 is constituted by a first electrode plate 111 that is a ring-shaped disc, a first insulating plate 112, a second electrode plate 113, a second insulating plate 114, and a sensor 115 that measures whether or not electrical conduction is established between the first electrode plate 111 and the second electrode plate 113.

[0012] In the molten metal leakage detection mechanism 110, in order to pass the leaked molten metal, a gap a is provided between the outer periphery of the nozzle 101 and the first electrode plate 111 and the like.

[0013] If the seal 107 is intact and no molten metal leaks, the first electrode plate 111 and the second electrode plate 113 are insulated by the first insulating plate 112 and are not electrically conducted.

[0014] Due to a change in the press-contact state of the nozzle 101 of the electromagnetic pump 102 and the feeder 103, or the like, the sealing performance of the seal 107 is sometimes reduced.

[0015] At this time, as shown in Figure 7 , the molten metal 105 leaks through the seal 107. The leaked molten metal 116 brings the first electrode plate 111 and the second electrode plate 113 into an electrically conducted state. Then, the first electrode plate 111 and the second electrode plate 113 are electrically conducted, and the molten metal leakage is detected by the sensor 115.

[0016] When the molten metal leakage is detected by the sensor 115, based on the detection signal, a stop treatment of the casting device 100 is taken. Even if the electromagnetic pump 102 is stopped, a certain degree of time is required until the pressure of the molten metal 105 drops.

[0017] Even if the electromagnetic pump 102 is stopped, the leakage of the molten metal 105 does not stop until the pressure drops, and the leaked molten metal 117 flows down as shown by the imaginary line. The leaked molten metal 117 reacts with the heater 118, and the heater 118 is damaged. The damaged heater 118 needs to be replaced with a new heater, and a replacement work is required, and the replacement cost increases.

[0018] In terms of reduction of the replacement work and the replacement cost, a configuration in which the leaked molten metal 116 does not reach or is difficult to reach the heater 118 is desired.

[0019] In addition, in Figure 7 , at an initial stage of the leakage, the leaked molten metal 116 is in a small amount. The small amount of the molten metal 116 flows down along the outer peripheral surface of the nozzle 101. When the thickness of the molten metal 116 is smaller than the gap a, the molten metal 116 can flow down in a state in which it does not contact both or one of the first electrode plate 111 and the second electrode plate 113. Even the small amount of the molten metal 116 can cause damage of the heater 118 when it reaches the heater 118

[0020] From the viewpoint of protecting the heater 118, it is also desired to improve the detection accuracy of the sensor 115.

[0021] Therefore, a configuration in which the detection accuracy of the sensor 115 is high and the leaked molten metal 116 does not reach or is difficult to reach the heater 118 is desired.

[0022] Prior Art Documents

[0023] Patent Documents

[0024] Patent Literature 1: Japanese Patent Application Publication No. 2019-860 SUMMARY

[0025] PROBLEMS TO BE SOLVED BY THE INVENTION

[0026] The present application has an object to provide a configuration in which the detection accuracy of molten metal leaking between a nozzle and a feeder is high, and the leaked molten metal does not reach or hardly reaches a heater.

[0027] MEANS FOR SOLVING THE PROBLEMS

[0028] The application of technical solution 1 is a casting device provided with an electromagnetic pump that draws molten metal and discharges it upward from an upper nozzle, a feeder that is placed on the nozzle and guides the molten metal, and a seal that is arranged between the feeder and the nozzle, characterized in that

[0029] The casting device is provided with a molten metal leakage detection mechanism that detects molten metal leaking through the seal,

[0030] The molten metal leakage detection mechanism is arranged at a position lower than the seal in a manner surrounding the outer circumferential surface of the upper portion of the nozzle,

[0031] The molten metal leakage detection mechanism is composed of a first electrode plate, a first insulating plate arranged below the first electrode plate, a second electrode plate arranged below the first insulating plate, a second insulating plate arranged below the second electrode plate, a sensor that detects whether the first electrode plate and the second electrode plate are electrically conducted, and a flange portion that horizontally protrudes from the outer circumferential surface of the nozzle,

[0032] The first electrode plate, the first insulating plate, the second electrode plate, and the second insulating plate have a prescribed gap between them and the outer circumferential surface of the nozzle,

[0033] The second insulating plate is placed on the flange portion.

[0034] The application of technical solution 2 is a casting device provided with an electromagnetic pump that draws molten metal and discharges it upward from an upper nozzle, a feeder that is placed on the nozzle and guides the molten metal, and a seal that is arranged between the feeder and the nozzle, characterized in that

[0035] The casting device is provided with a molten metal leakage detection mechanism that detects molten metal leaking through the seal,

[0036] The molten metal leakage detection mechanism is arranged in a position lower than the seal in a manner of surrounding the outer circumferential surface of the upper portion of the nozzle,

[0037] The molten metal leakage detection mechanism is composed of a first electrode plate, a first insulating plate arranged below the first electrode plate, a second electrode plate arranged below the first insulating plate, a second insulating plate arranged below the second electrode plate, a sensor for detecting whether the first electrode plate and the second electrode plate are electrically conducted, and a flange portion horizontally extending from the outer circumferential surface of the nozzle,

[0038] The first electrode plate and the first insulating plate have a prescribed gap with the outer circumferential surface of the nozzle,

[0039] The second electrode plate and the second insulating plate extend in a manner of contacting the outer circumferential surface of the nozzle,

[0040] The second insulating plate is placed on the flange portion.

[0041] Inventive Effects

[0042] In the invention of the technical solution 1, the first electrode plate, the first insulating plate, the second electrode plate and the second insulating plate have a prescribed gap with the outer circumferential surface of the nozzle. On this basis, the second insulating plate is placed on the flange portion.

[0043] The leaked molten metal is accumulated in a space formed with a prescribed gap and with the upper surface of the flange portion as a bottom surface.

[0044] Through the accumulated molten metal, the first electrode plate and the second electrode plate are electrically conducted, and the leaked molten metal is rapidly and reliably detected by the sensor.

[0045] That is, by accumulating the molten metal above the flange, the detection accuracy of the sensor can be improved.

[0046] In addition, by the flange, the molten metal is prevented from directly flowing down to the heater, thereby reducing the possibility of the molten metal reaching the heater.

[0047] Therefore, according to the invention, a configuration is provided, in which the detection accuracy of the leaked molten metal from between the nozzle and the feeder is high, and the leaked molten metal does not reach or is difficult to reach the heater.

[0048] In the invention of the technical solution 2, the first electrode plate and the first insulating plate have a prescribed gap with the outer circumferential surface of the nozzle, and the second electrode plate and the second insulating plate contact the outer circumferential surface of the nozzle. On this basis, the second insulating plate is placed on the flange portion.

[0049] The leaked molten metal is accumulated in a space formed with a prescribed gap and with the upper surface of the second electrode plate as a bottom surface.

[0050] The first electrode plate and the second electrode plate are electrically conducted via the accumulated molten metal, which is rapidly and reliably detected by the sensor.

[0051] Furthermore, since the molten metal is accumulated on the second electrode plate, the electrical contact of the molten metal with the second electrode plate becomes good. By accumulating the molten metal above the second electrode plate, the detection accuracy of the sensor can be further improved.

[0052] Furthermore, by the flange, the molten metal is prevented from directly flowing down to the heater, thereby reducing the possibility of the molten metal reaching the heater.

[0053] Therefore, according to the present application, there is provided a configuration in which the detection accuracy of the leaked molten metal between the nozzle and the feeder is high, and the leaked molten metal does not reach or hardly reaches the heater. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a sectional view of a casting apparatus of the present application.

[0055] Figure 2 is a 2-part enlarged view of Figure 1

[0056] Figure 3 is an explanatory view.

[0057] Figure 4 is an explanatory view of a modification of the present application.

[0058] Figure 5 is a sectional view of a conventional casting apparatus.

[0059] Figure 6 is a 6-part enlarged view of Figure 5

[0060] Figure 7 is an explanatory view.

[0061] REFERENCE NUMERALS

[0062] 10: casting apparatus; 11: feeder; 12: mold; 13: molten metal; 20: electromagnetic pump; 28: nozzle; 31: seal; 40: molten metal leakage detection mechanism; 41: first electrode plate; 42: first insulating plate; 43: second electrode plate; 44: second insulating plate; 45: sensor; 46: leaked molten metal; 47: heater; 48: flange portion; a: gap. DETAILED DESCRIPTION

[0063] Hereinafter, an embodiment of the present application will be described based on the drawings.

[0064] [EMBODIMENT] ​​

[0065] As shown in Figure 1 The pump shaft of the casting device 10 is vertical (perpendicular to the horizontal plane), and the casting device 10 is mainly composed of an electromagnetic pump 20, a feeder 11, and a mold 12.

[0066] The electromagnetic pump 20 has a nozzle 28 at the upper portion.

[0067] The feeder 11 is disposed above the nozzle 28.

[0068] The mold 12 is disposed above the feeder 11.

[0069] The electromagnetic pump 20 has a base flange 21, a liquid guide tube 22 extending through the base flange 21, a core member 23 housed in the liquid guide tube 22, a lower coil 24 surrounding the lower portion of the liquid guide tube 22, a lower housing 25 surrounding the lower coil 24 and suspended from the base flange 21, an upper coil 26 surrounding the upper portion of the liquid guide tube 22, an upper housing 27 surrounding the upper coil 26 and placed on the base flange 21, a nozzle 28 extending upward from the liquid guide tube 22, a liquid level gauge 29 surrounding the nozzle 28, and an upper flange 30 connected to the upper housing 27.

[0070] When the lower coil 24 is energized, a Lorentz force is generated according to the Fleming's left-hand rule, and the molten metal 13 is lifted.

[0071] Next, if the molten metal 13 reaches the vicinity of the center of the upper coil 26, the upper coil 26 is energized, and if the lower coil 24 is not energized, the molten metal 13 is lifted to the liquid level gauge 29. The liquid level of the liquid level gauge 29 becomes the "standby liquid level".

[0072] According to the Fleming's left-hand rule, if the current is increased, the Lorentz force increases.

[0073] If the current of the upper coil 26 is further increased, the molten metal exceeds the liquid level gauge 29, is discharged upward from the nozzle 28, passes through the feeder 11, and is cast into the casting mold 12.

[0074] Figure 1 The two enlarged views of Figure 2 are shown in

[0075] As shown in Figure 2 , the joint of the nozzle 28 and the feeder 11 is sealed by a seal 31.

[0076] A molten metal leakage detection mechanism 40 is disposed in a manner of surrounding the outer peripheral surface of the upper portion of the nozzle 28.

[0077] The molten metal leakage detection mechanism 40 is composed of: a first electrode plate 41 which is a ring-shaped disc; a first insulating plate 42 disposed below the first electrode plate 41; a second electrode plate 43 disposed below the first insulating plate 42; a second insulating plate 44 disposed below the second electrode plate 43; a sensor 45 which detects whether the first electrode plate 41 and the second electrode plate 43 are electrically conducted; and a flange portion 48 which horizontally extends from the outer peripheral surface of the nozzle 28.

[0078] Further, a prescribed gap α is provided between the first electrode plate 41, the first insulating plate 42, the second electrode plate 43, the second insulating plate 44, and the outer peripheral surface of the nozzle 28.

[0079] On this basis, the second insulating plate 44 is placed on the flange portion 48.

[0080] In this state, the seal 31 is intact, and the molten metal 13 does not leak. Figure 2

[0081] The first electrode plate 41 and the second electrode plate 43 are in a non-conducted state, and the sensor 45 does not detect molten metal leakage.

[0082] When the sealing performance of the seal 31 decreases due to a change in the press-contact state of the nozzle 28 of the electromagnetic pump 10 and the feeder 11, or the like, the molten metal 13 begins to leak.

[0083] As shown in Fig. 4, the flange 48 is formed with a space having the upper surface of the flange 48 as a bottom surface and a prescribed gap α as a width above the flange 48. The leaked molten metal 46 is accumulated in the space formed with the prescribed gap α. Figure 3 The accumulated molten metal 46 causes the first electrode plate 41 and the second electrode plate 43 to be in a conducted state. The sensor 45 detects that the first electrode plate 41 and the second electrode plate 43 are electrically conducted, and generates this detection signal.

[0084] That is, by accumulating the molten metal 46 in the space above the flange 48, the detection accuracy of the sensor 45 can be improved.

[0085] Further, by preventing the molten metal 46 from directly flowing down to the heater 47 using the flange 48, the concern that the molten metal 46 reaches the heater 47 is reduced.

[0086] Based on the detection signal from the sensor 45, the leakage of the molten metal 13 can be detected.

[0087] Figure 4 A modification of the present application will be described.

[0088] As shown in Fig. 6, the flange portion 48 is formed with a space having the upper surface of the flange portion 48 as a bottom surface and a prescribed gap α as a width above the flange portion 48. Figure 4 ​​As shown, the first electrode plate 41 and the first insulating plate 42 have a prescribed gap α between the outer peripheral surface of the nozzle 28. On the other hand, the second electrode plate 43 and the inner peripheral surface of the second insulating plate 44 are in contact with the outer peripheral surface of the nozzle 28.

[0089] On this basis, the second insulating plate 44 is placed on the flange portion 48.

[0090] The nozzle 28 is a non-conductive ceramic nozzle, and the second electrode plate 43 is in contact with the outer peripheral surface of the nozzle 28, which is electrically unproblematic.

[0091] In Figure 4 , if a portion of the molten metal 13 leaks through the seal 31, the leaked molten metal 46 accumulates in the space formed with the gap α with the upper surface of the second electrode plate 43 as the bottom surface. Figure 3

[0092] The accumulated molten metal brings the first electrode plate 41 and the second electrode plate 43 into an electrically conductive state. The sensor 45 detects that the first electrode plate 41 and the second electrode plate 43 are electrically conductive, and generates this detection signal.

[0093] At this time, the accumulated molten metal is placed on the second electrode plate 43 with a width of α.

[0094] In Figure 3 , the contact area of the second electrode plate 43 with respect to the molten metal 46 is proportional to the thickness of the second electrode plate 43. In contrast, in Figure 4 , the contact area of the second electrode plate 43 with respect to the molten metal is proportional to (the thickness + α) of the second electrode plate 43.

[0095] That is, in the structure of Figure 4 , the contact area of the molten metal with the second electrode plate 43 becomes large. If the contact area becomes large, the frequency of contact with the molten metal becomes high, and the detection accuracy of the sensor 45 can be further improved.

[0096] Furthermore, by using the flange 48 to prevent the molten metal 46 from directly flowing down to the heater 47, the concern that the molten metal 46 reaches the heater 47 is reduced.

[0097] In addition, in the embodiment, the pump shaft is vertical, but as long as it is within a range of 0° to 45° from the vertical axis, the pump shaft can also be inclined.

[0098] Industrial applicability

[0099] The present application is applicable to a casting device that has an electromagnetic pump as a main part.​

Claims

1. A casting apparatus including an electromagnetic pump that draws molten metal and discharges it upward from an upper nozzle, a feeder that is placed on the nozzle and guides the molten metal, and a seal that is provided between the feeder and the nozzle, characterized in that the casting apparatus includes a molten metal leakage detection mechanism that detects molten metal that leaks through the seal, the molten metal leakage detection mechanism is provided at a position lower than the seal in a manner that surrounds an outer circumferential surface of an upper portion of the nozzle, the molten metal leakage detection mechanism is composed of a first electrode plate, a first insulating plate provided below the first electrode plate, a second electrode plate provided below the first insulating plate, a second insulating plate provided below the second electrode plate, a sensor that detects whether the first electrode plate and the second electrode plate are electrically conducted, and a flange portion that horizontally extends from the outer circumferential surface of the nozzle, a prescribed gap is provided between the first electrode plate, the first insulating plate, the second electrode plate, the second insulating plate, and the outer circumferential surface of the nozzle, and the second insulating plate is placed on the flange portion.

2. A casting apparatus including an electromagnetic pump that draws molten metal and discharges it upward from an upper nozzle, a feeder that is placed on the nozzle and guides the molten metal, and a seal that is provided between the feeder and the nozzle, characterized in that the casting apparatus includes a molten metal leakage detection mechanism that detects molten metal that leaks through the seal, the molten metal leakage detection mechanism is provided at a position lower than the seal in a manner that surrounds an outer circumferential surface of an upper portion of the nozzle, the molten metal leakage detection mechanism is composed of a first electrode plate, a first insulating plate provided below the first electrode plate, a second electrode plate provided below the first insulating plate, a second insulating plate provided below the second electrode plate, a sensor that detects whether the first electrode plate and the second electrode plate are electrically conducted, and a flange portion that horizontally extends from the outer circumferential surface of the nozzle, a prescribed gap is provided between the first electrode plate and the first insulating plate and the outer circumferential surface of the nozzle, the second electrode plate and the second insulating plate extend in contact with the outer circumferential surface of the nozzle, and the second insulating plate is placed on the flange portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images