Casting device

Abstract

The invention provides a casting device which is provided with a sensor capable of accurately measuring the temperature of molten metal cast from a casting ladle. A casting device (1) according to the present invention is characterized by comprising: a ladle (2) having a nozzle (21) and storing molten metal; a tilting mechanism (35) that tilts the ladle (2); a moving mechanism that moves the ladle (2) together with the tilting mechanism (35) to a predetermined casting position; and a temperature sensor (22) that is provided to the nozzle (21) of the ladle (2) and measures the temperature of the molten metal by means of a temperature measurement unit in the molten metal immersed in the nozzle (21).

Description

Technical Field

[0001] The present invention relates to a casting device for casting molten metal stored in a ladle into a casting mold. Background Art

[0002] Conventionally, in the casting process, molten metal is transferred to a ladle in a furnace, the ladle is transported to a casting machine by a molten metal transport device, and the casting machine is used to cast the metal into a mold.

[0003] If the temperature of the molten metal is lower than the specified temperature, the molten metal will not be fully cast (undercast), etc. Therefore, in order to prevent the occurrence of defects, the molten metal is often discharged. On the contrary, if the temperature of the molten metal rises too much relative to the desired temperature, excessive energy is consumed accordingly, which violates carbon neutrality.

[0004] As a method for measuring the temperature of molten metal, there are a method of manually inserting an immersion thermometer into a ladle containing molten metal, a temperature measuring method based on manual operation using a handy type reflection thermometer, and a relative temperature measuring method based on a non-contact thermometer installed on a machine. In the temperature measuring method based on manual operation, the protective cover of the thermometer must be replaced each time, and the working environment is also poor. In the relative temperature measuring method based on a non-contact thermometer set up by a machine, there is a situation where the non-contact thermometer needs to be adjusted for each material of the molten metal. In this way, there are various problems with the existing temperature measuring methods.

[0005] For example, Patent Documents 1 and 2 disclose methods for measuring the temperature of molten metal.

[0006] Patent document 1 discloses a method in which a radiation thermometer is provided at a drop port from a tundish of a stopper casting machine to measure the temperature of the molten metal being cast. Patent document 2 discloses a method in which an optical fiber radiation thermometer is provided to measure the surface temperature of the molten metal being cast from a discharge port of a casting ladle of a tilting casting machine.

[0007] However, the radiation thermometer is a relative measurement, which is affected by the change of the measurement distance and the state of the measurement surface (especially impurities called slag on the surface of the molten metal). Therefore, the existing measurement method has the problem of not being able to accurately measure the temperature of the molten metal stored in the ladle.

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2009-204556

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2021-102213 Summary of the invention

[0010] The present invention has been made in view of the above-mentioned actual situation, and an object of the present invention is to provide a casting device including a sensor capable of accurately measuring the temperature of molten metal cast from a ladle.

[0011] The casting device of the present invention for solving the above-mentioned problems is characterized in that it comprises: a ladle having a nozzle and storing molten metal; a tilting mechanism that tilts the ladle in a manner that maintains the discharge position from the nozzle of the ladle at a constant position; a moving mechanism that moves the casting ladle together with the tilting mechanism to a specified casting position; and a temperature sensor that is provided at the nozzle of the ladle with a temperature measuring portion immersed in the molten metal and measures the temperature of the molten metal.

[0012] In the casting device of the present invention, the temperature sensor is provided on the nozzle of the ladle in a state where the temperature measuring part is immersed in the molten metal. According to this structure, the temperature of the molten metal cast from the nozzle can be directly measured. That is, the temperature of the molten metal can be accurately measured.

[0013] In the casting device of the present invention, the temperature sensor is preferably inserted into the nozzle from the outer peripheral surface of the front side or other side of the nozzle facing downward when tilting. According to this structure, since the temperature measuring part of the temperature sensor can be brought into contact with the molten metal cast from the nozzle, the temperature of the molten metal can be reliably measured.

[0014] In the casting device of the present invention, the temperature measuring part of the temperature sensor is preferably set to be always immersed in the molten metal. According to this structure, the temperature measuring part of the temperature sensor is not exposed, the temperature measuring part is not in contact with the outside air, and the molten metal and the temperature measuring part can maintain approximately the same temperature, thereby maintaining a temperature stable state. Therefore, it is possible to suppress the reduction of temperature measurement accuracy.

[0015] In the casting device of the present invention, the temperature sensor preferably has a protective portion on the periphery of the temperature measuring portion, and the protective portion is formed of a carbon-containing refractory material, and the carbon-containing refractory material includes SiO2 with a weight ratio of 10% to 30%, SiC with a weight ratio of 4% to 15%, C with a weight ratio of 15% to 35%, and the remainder of one or more of Al2O3, MgO, and spinel. According to this structure, a temperature sensor with excellent durability is obtained even when used for a nozzle of a casting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view which shows the structure of the casting device which concerns on embodiment.

[0017] Figure 2 It is a side view which shows the structure of the casting device which concerns on embodiment.

[0018] Figure 3 It is a diagram showing an example of a production line configuration of a casting device according to an embodiment.

[0019] Figure 4 This is a front view showing a ladle of the casting device according to the embodiment.

[0020] Figure 5 It is a side view which shows the ladle of the casting device which concerns on embodiment.

[0021] Figure 6 It is a cross-sectional view showing the structure near the temperature measuring part of the temperature sensor according to the embodiment.

[0022] Figure 7 is the temperature measurement result of the temperature sensor of the embodiment.

[0023] Figure 8 This is a test device for evaluating the material of the temperature sensor protection tube.

[0024] Fig. 9 A block diagram showing a control system of a casting device according to an embodiment.

[0025] Fig.10 This is a front view of a ladle of a casting device showing a deformation method.

[0026] Fig.11 This is a front view of a ladle of a casting device showing a deformation method.

[0027] Description of Reference Numerals

[0028] 1...casting device; 2...ladle; 20...main body; 21...nozzle; 22...temperature sensor; 220...thermocouple (temperature measuring part); 223...protection tube (protection part); 3...ladle tilting unit; 30...unit base; 32...first frame; 33...second frame; 34...lifting part; 35...tilting part; 36...lateral moving part; 4...control device. DETAILED DESCRIPTION

[0029] Hereinafter, the present invention will be specifically described using embodiments.

[0030] [Implementation Method]

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the casting device 1 of this embodiment includes a ladle 2 and a ladle tilting unit 3. Figure 3 As shown, the casting device 1 of this embodiment is a device for casting a plurality of casting molds arranged in a casting mold line.

[0032] The ladle 2 stores molten metal for casting into a mold. The ladle 2 has a main body 20 and a nozzle 21. The main body 20 has a substantially groove shape in which the molten metal is stored. The nozzle 21 is provided on the side (peripheral surface) of the main body 20, and has a substantially groove shape with the upper side protruding from the outer peripheral surface of the main body 20 toward the radial outer side, and the molten metal is cast from its upper end. That is, the upper end (front end) of the nozzle 21 becomes a casting port. The nozzle 21 allows the molten metal to flow along the extending direction of the substantially groove shape during casting. The ladle 2 casts the molten metal by tilting the main body 20 in such a manner that the position of the casting port of the nozzle 21 is relatively located below the main body 20. In this embodiment, the ladle 2 is tilted and casts in such a manner that the bottom surface of the substantially groove-shaped nozzle 21 rotates downward. The nozzle 21 (as well as the substantially groove-shaped bottom surface and the casting port) swing along a plane perpendicular to the rotation axis of the ladle 2. The front surface in this embodiment refers to a surface that faces the bottom surface (outer peripheral surface) of the nozzle 21 .

[0033] The nozzle 21 of the ladle 2 is provided with a temperature sensor 22 .

[0034] The temperature sensor 22 is a roughly rod-shaped component having a temperature measuring portion and a protective tube. The temperature measuring portion is located at the front end of the temperature sensor 22. The temperature measuring portion measures the temperature of the molten metal. The protective tube is arranged on the periphery of the temperature measuring portion. The protective tube is composed of a cylindrical sintered body with a closed front end, and the temperature measuring portion is accommodated inside it.

[0035] like Figure 4-5 As shown, the temperature sensor 22 is inserted and fixed in the front side of the roughly groove-shaped nozzle 21, which is opposite to the bottom when tilted, from the outside of the nozzle 21 toward the inside of the nozzle 21. In other words, the temperature sensor 22 is inserted and fixed in the front side of the nozzle 21, from the outer peripheral surface side of the nozzle 21 toward the inside of the nozzle. The base end of the temperature sensor 22 is fixed in a state where the front end portion, which becomes the temperature measuring portion, protrudes from the inner peripheral surface of the nozzle 21 toward the inside of the nozzle 21. The temperature sensor 22 is arranged so that the temperature measuring portion is always immersed in the molten metal during the period when the casting device 1 of this embodiment casts the molten metal into the mold even when the ladle 2 is tilted. The temperature measuring portion of the temperature sensor 22 is preferably arranged at a position close to the casting port of the nozzle 21.

[0036] The temperature sensor 22 is a temperature measuring unit for measuring the temperature of the molten metal. In this embodiment, the temperature measuring unit is a temperature measuring junction 221 of a thermocouple. The temperature sensor 22 sends the temperature measurement result to the control device 4.

[0037] The protective tube is formed of a carbon-containing refractory material. The carbon-containing refractory material contains SiO2 in a mass ratio of 10% to 30%, SiC in a mass ratio of 4% to 15%, and C in a mass ratio of 15% to 35%. The components other than SiO2, SiC and C in the carbon-containing refractory material, that is, the remaining part, contain one or more selected from Al2O3, MgO, and spinel. In addition, the above-mentioned percentages are percentages when the mass of the carbon-containing refractory material is set to 100% by mass.

[0038] For temperature sensors whose protective tube is made of Al2O3-SiC-SiO2-C ( Figure 6 The temperature measurement characteristics when the temperature measuring part is immersed in the molten metal are measured and shown in Figure 7 .like Figure 6 As shown, the temperature sensor is a temperature measuring probe having a thermocouple 220, an alumina tube 222, and a protective tube 223. The thermocouple 220 is equivalent to the temperature measuring portion of the temperature sensor in the casting device of the present invention. The thermocouple 220 has a temperature measuring junction 221. The alumina tube 222 is composed of alumina ceramic in the shape of a bottomed cylindrical test tube in which the thermocouple 220 is arranged. The alumina tube 222 is provided with a temperature measuring junction 221 at the front end. A protective tube 223 is arranged on the outer periphery of the alumina tube 222. The protective tube 223 is equivalent to the protective portion of the temperature sensor in the casting device of the present invention.

[0039] according to Figure 7 The temperature measurement characteristics of the ladle 2 are such that the temperature measured stabilizes after 240 seconds (4 minutes), and accurate temperature measurement can be performed. It is known that when the temperature sensor (temperature measuring probe) is immersed in the molten metal, it takes about 240 seconds (4 minutes) until the temperature of the protection tube and the like stabilizes. The temperature measurement of the ladle 2 is started 5 minutes after the casting. Since the temperature sensor is used after being fully heated, by measuring the temperature of the ladle 2 in this way, accurate temperature measurement can be performed from the beginning of the use of the ladle.

[0040] Figure 6 The temperature sensor (temperature probe) shown has an average durability of 30 hours (maximum 60 hours) under the conditions of use for measuring temperature at the tundish of continuous casting in an ironworks. That is, the temperature sensor has sufficient durability even when used for a ladle.

[0041] The material of the protection tube of the temperature sensor was evaluated. Table 1 shows the test results. In the test, first, test pieces of the embodiment and the comparative example were prepared. As the test piece of the embodiment, a prismatic test piece of Al2O3-SiC-SiO2-C was prepared. As the test piece of the comparative example, a prismatic test piece was prepared for each of Al2O3-SiC-C, MgO-SiC-C, and Spinel-SiC-C. The lower end of each test piece was immersed in molten metal of cast iron (FC250) maintained at 1350-1470°C. At this time, the prismatic test piece was arranged in a state where the length direction was facing up and down. Then, as Figure 8 As shown in FIG. 1 , each test piece was rotated in a circular manner for 4 hours. At this time, the test piece was moved in a circular direction so as to stir the molten metal.

[0042] After the rotation was completed, the cross section of the test piece was observed, and the melting loss resistance and oxidation resistance of each test piece were evaluated.

[0043] In Table 1, ○ means excellent oxidation resistance, × means poor oxidation resistance, and ×× means significantly poor oxidation resistance.

[0044] In the test pieces of the examples and the comparative examples, no change in the external shape was observed, and no melting loss was confirmed.

[0045] The test pieces of Examples had sufficient oxidation resistance.

[0046] In contrast, in the test pieces of each comparative example, a reaction between the material of the protection tube and the cast iron was confirmed. Specifically, when observing the cross section, discoloration from the surface toward the inside can be confirmed. This discoloration is believed to be caused by the reaction product between the material of the protection tube and the cast iron.

[0047] From these results, it can be confirmed that the examples containing silicon dioxide (SiO 2 ) are excellent in melting loss resistance and oxidation resistance.

[0048]

Table 1

[0049]

[0050] The ladle tilting unit 3 has a tilting mechanism for tilting the ladle 2 located at a predetermined position to cast the molten metal. The tilting mechanism has a mechanism that can move the ladle 2 along three axes, namely, the front-rear axis X, the lifting axis Z, and the tilting axis V, in such a way that the discharge position of the nozzle 21 from the ladle 2 is maintained at a constant position. Specifically, the front-rear axis X, the lifting axis Z, and the tilting axis V move the ladle 2 along three axes in such a way that the discharge position of the nozzle 21 from the ladle 2 is maintained at a constant position. More specifically, the front-rear axis X, the lifting axis Z, and the tilting axis V tilt the ladle 2 in such a way that the front end of the nozzle 21 of the ladle 2 becomes the tilting center of the ladle 2. That is, the front-rear axis X, the lifting axis Z, and the tilting axis V function as a tilting mechanism for tilting the ladle 2 in such a way that the discharge position of the nozzle 21 from the ladle 2 is maintained at a constant position.

[0051] The ladle tilting unit 3 includes a unit base 30, a first frame 32, the ladle 2, a second frame 33, a tilting unit 35, a lifting unit 34, and a lateral moving unit 36. The unit base 30 places the first frame 32, the ladle 2, the second frame 33, the tilting unit 35, and the lifting unit 34.

[0052] The ladle tilting unit 3 has a front-to-back moving part (not shown) that moves the unit base 30 in the horizontal direction and in the direction of approaching and separating from the mold, that is, in the X direction (X-axis direction). The front-to-back moving part 31 is composed of a device that moves the unit base 30, and a motor is used in this embodiment. The front-to-back moving part 31 moves the unit base 30 in the X direction, thereby adjusting the position of the ladle 2 in the X direction relative to the mold. The front-to-back moving part 31 constitutes one axis (front-to-back axis) of the three-axis structure of the casting device 1.

[0053] The first frame 32 is provided on the lateral moving part 36 (equivalent to the lateral driving part) and extends in the vertical direction (Z direction). The first frame 32 is, for example, columnar. The first frame 32 supports the ladle 2 via the second frame 33 .

[0054] The second frame 33 supports the ladle 2. The second frame 33 is supported by the first frame 32. The second frame 33 moves in the vertical direction along the first frame 32 via the lifting unit 34. The lifting unit 34 is composed of a device that moves the second frame 33 (and the ladle 2), and a motor is used in this embodiment. The lifting unit 34 constitutes one axis (lifting axis Z) of the three-axis structure of the casting device 1.

[0055] The second frame 33 supports the tilting part 35. The tilting part 35 is provided on the second frame 33 to tilt the ladle 2. The tilting part 35 tilts the ladle 2 around the rotation axis. The tilting part 35 is a tilting mechanism for tilting the ladle 2, and has a motor in this embodiment. The rotation axis is parallel to the Y direction and passes through the center of gravity of the ladle 2. The tilting part 35 tilts the ladle 2 around the rotation axis that is parallel to the travel direction of the ladle tilting unit 3, that is, the extension direction of the guide rail. The rotation angle θ of the rotation axis becomes the tilting angle. The ladle 2 is tilted by the tilting part 35, thereby being able to guide the molten metal from the main body 20 to the nozzle 21, and being able to cast the molten metal into the mold 55 through the front end of the nozzle 21. The tilting part 35 constitutes one axis (tilting axis) of the three-axis structure of the casting device 1.

[0056] The unit base 30 is placed on the lateral moving part 36. The lateral moving part 36 moves the unit base 30 in the Y direction. The Y direction is a horizontal direction and is a direction parallel to the arranged molds 55. The lateral moving part 36 is composed of a device that moves the unit base 30, and a dolly is used in this embodiment. The lateral moving part 36 moves the unit base 30 in the Y direction, thereby adjusting the position of the ladle 2 relative to the mold 55 in the Y direction.

[0057] The casting device 1 of this embodiment has a control device 4 for controlling the entire casting device 1. The control device 4 controls and drives the front and rear axis servo motors of the front and rear moving part 31, the servo motor for traveling of the lateral moving part 36, the rotating axis servo motor of the tilting part, and the lifting axis servo motor of the lifting part. As an example, the control device 4 is configured as a PLC (Programmable Logic Controller). The control device 4 can also be configured as a common computer system including a main storage device such as a CPU (Central Processing Unit), a RAM (Random Access Memory) and a ROM (Read Only Memory), an input device such as a touch panel or a keyboard, an output device such as a display, an auxiliary storage device such as a hard disk, etc. In addition, the above-mentioned main storage device is an example of a storage medium, and the auxiliary storage device is also an example of a storage medium.

[0058] As a specific example of the control device 4, Fig. 9This is a block diagram showing a control system of a casting device. On the device side, there are servo motors for driving each axis, force sensors L, and temperature sensors. The control device has servo amplifiers for each axis, force sensor amplifiers, and a processing device. The processing device has an I / O unit, a high-speed counter unit, an A / DD / A conversion unit, a communication unit, and a central processing unit (CPU). The temperature sensor measures the temperature through the A / D conversion unit and the CPU. If necessary, data communication with an external processing device can also be performed through the communication unit. In addition, Fig. 9 Among the servo motors driving the axes shown, the lifting servo motor refers to the lifting axis servo motor of the lifting part, the tilting servo motor refers to the rotating axis servo motor of the tilting part, the front and rear servo motor refers to the front and rear axis servo motor, and the driving servo motor refers to the servo motor for driving.

[0059] [Ladle-changing molten metal conveying device]

[0060] The casting device 1 of this embodiment can be used for a ladle-exchange type molten metal conveying device 5 .

[0061] like Figure 3 As shown, an example of a ladle replacement type molten metal conveying device 5 includes: a ladle 2 , a ladle conveying carriage 50 , a ladle replacement device 51 , and a mold production line 54 .

[0062] The ladle 2 is a ladle used in the casting device 1 .

[0063] The ladle transport cart 50 is a cart on which the ladle 2 is placed. The ladle transport cart 50 is provided so as to be movable between a position where molten metal from a melting furnace is cast and (a roller conveyor of) a ladle replacing device 51 .

[0064] The ladle replacement device 51 is a device for replacing the ladle 2 of the casting device 1. The ladle replacement device 51 replaces the ladle 2 for storing molten metal for casting and the ladle 2 for discharging molten metal after casting.

[0065] The ladle replacing device 51 has a roller conveyor for placing and conveying the ladle 2. The roller conveyor has a first roller conveyor 52 for conveying a ladle storing molten metal, and a second roller conveyor 53 for conveying a ladle from which molten metal is discharged after casting.

[0066] The casting mold line 54 is formed by arranging a plurality of casting molds 55 .

[0067] [action]

[0068] The ladle replacement type molten metal conveying device 5 places the ladle 2 on the ladle conveying carriage 50, moves the ladle 2 to a position for receiving molten metal from the furnace, and receives the molten metal with the ladle 2. After casting, the ladle conveying carriage 50 and the ladle 2 placed on the ladle conveying carriage 50 are moved to the ladle replacement device 51. In the ladle replacement device 51, the ladle 2 is placed on the first roller conveyor 52 and assembled to the casting device 1.

[0069] The casting device 1 equipped with the ladle 2 is moved to a predetermined position where molten metal can be cast into the mold 55 by the lateral moving part 36. The control device 4 operates the front-rear moving part 31 and the lifting part 34 to keep the casting port of the nozzle 21 of the ladle 2 at a predetermined position on the mold 55.

[0070] Furthermore, the control device 4 operates the tilting unit 35 to tilt the ladle 2 to pour the molten metal into the mold 55. The control device 4 preferably operates the front-rear moving unit 31 and the lifting unit 34 to maintain the position of the pouring port of the nozzle 21 at a predetermined position.

[0071] In the casting device 1 of this embodiment, when casting is performed by tilting the ladle 2, the temperature measuring portion of the temperature sensor 22 is immersed in the molten metal in the nozzle 21. Therefore, the temperature sensor 22 directly measures the temperature of the molten metal cast from the casting port.

[0072] After the casting to one mold 55 is completed, the control device 4 returns the tilting angle of the ladle 2 to end the discharge of the molten metal from the ladle 2. When the casting device 1 of this mode returns the tilting angle of the ladle 2, the ladle 2 is not returned to the upright state, but the tilting angle of the ladle 2 is returned to the tilting state to the extent that the molten metal is not discharged from the casting port of the nozzle 21. That is, the casting device 1 of this mode preferably has a tilting state of the ladle 2 from the completion of the casting to one mold 55 to the start of the casting to the next mold, in which the ladle 2 is tilted from the upright state and the molten metal does not flow out from the casting port, that is, the tilting state shortly after the casting is completed. In such a tilting state, when casting is performed on multiple molds, since the molten metal is always in the state of staying in the nozzle 21, the temperature measuring part of the temperature sensor 22 is always immersed in the molten metal. Therefore, the temperature of the molten metal can be always grasped by the temperature sensor 22.

[0073] The control device 4 obtains the temperature measurement result of the temperature sensor 22. When the temperature of the molten metal deviates from the predetermined temperature range, a signal is sent, for example, to stop the casting, or the control device 4 reports this to the operator (by voice, display, etc.).

[0074] Next, the control device 4 moves the casting device 1 to a predetermined position where the molten metal can be cast into another casting mold 55 by the lateral moving unit 36, and performs casting in the same manner as above. This operation is repeated to perform casting into a plurality of casting molds 55 arranged along the casting mold line 54.

[0075] When the casting is finished and the molten metal in the ladle 2 disappears, the control device 4 moves the casting device 1 to the second roller conveyor 53 through the lateral moving part 36, and removes the ladle 2 from the casting device 1. The ladle 2 is conveyed by the second roller conveyor 53 and placed on the ladle replacement device 51. In addition, the control device of the ladle replacement device 51 drives the ladle replacement device 51 to place the ladle 2 on the ladle conveying trolley 50. Then, the ladle 2 is controlled by the control device of the ladle conveying trolley 50 to move to the position of receiving the molten metal from the furnace again, and receives the molten metal from the furnace. Each control device repeats the above-mentioned operation to cast into a plurality of molds 55.

[0076] [Effects of the casting device 1 of this embodiment]

[0077] The casting device 1 of this embodiment includes: a ladle 2, a tilting part 35, a moving mechanism, and a temperature sensor 22. The ladle 2 is a component having a nozzle 21 and storing molten metal. The tilting part 35 is a mechanism for tilting the ladle 2 in a manner that the discharge position from the nozzle 21 of the ladle 2 is maintained at a constant position, and is equivalent to a tilting mechanism. The moving mechanism is a mechanism for moving the ladle 2 together with the tilting part 35 to a predetermined casting position. The temperature sensor 22 is provided at the nozzle 21 of the ladle 2, and measures the temperature of the molten metal in a state where the temperature measuring part is immersed in the molten metal.

[0078] The temperature sensor 22 in the casting device 1 of the present embodiment is provided at the nozzle 21 of the ladle 2, and the temperature measuring portion of the temperature sensor 22 is immersed in the molten metal in the nozzle 21. Since the temperature sensor 22 in the casting device 1 of the present embodiment is configured as described above, the temperature of the molten metal cast from the nozzle 21 can be directly measured. That is, the temperature sensor 22 can directly measure the temperature of the molten metal and can accurately measure the temperature of the molten metal. In contrast, in the case of a non-contact thermometer, there is a case where it is difficult to accurately measure the actual temperature of the molten metal due to the influence of impurities such as slag on the surface of the molten metal.

[0079] In the casting device 1 of this embodiment, the temperature sensor 22 is inserted into the inside from the front surface of the nozzle 21, that is, the outer peripheral surface of the portion of the nozzle 21 that faces downward when tilted. The casting device 1 of this embodiment is configured as above, so that the temperature measuring portion of the temperature sensor 22 can be set to contact the molten metal flowing through the nozzle 21, and the temperature of the molten metal can be reliably measured.

[0080] In the casting device 1 of this embodiment, the temperature measuring part of the temperature sensor 22 is always immersed in the molten metal. Therefore, in the casting device 1 of this embodiment, the temperature measuring part of the temperature sensor 22 is not exposed, and the reduction in temperature measurement accuracy can be suppressed. In detail, the temperature measuring part of the temperature sensor 22 remains immersed in the molten metal, and the molten metal and the temperature measuring part can maintain approximately the same temperature. That is, the temperature measuring part does not come into contact with the outside air, etc., and the temperature of the temperature measuring part does not decrease. As a result, the temperature of the protective tube of the temperature sensor 22, etc. can be maintained in a stable state.

[0081] The temperature sensor 22 in the casting device 1 of the present embodiment has a protective portion on the outer periphery. The protective portion is formed of a carbon-containing refractory material. The carbon-containing refractory material, when its mass is set to 100 mass %, contains SiO2 with a mass ratio of 10% to 30%, SiC with a mass ratio of 4% to 15%, and C with a mass ratio of 15% to 35%. In addition, the remaining part of the carbon-containing refractory material contains one or more selected from Al2O3, MgO, and spinel. The temperature sensor 22 in the casting device 1 of the present embodiment has excellent durability due to the presence of such a protective portion, and is suitable for measuring the temperature of the molten metal flowing through the nozzle 21 of the casting device 1. In particular, the carbon-containing oxide that forms the protective portion in contact with the molten metal has excellent resistance to melting and oxidation, and exhibits high durability even if it is set in the nozzle 21.

[0082] [Transformation method]

[0083] In the above-described embodiment, the temperature sensor 22 is fixed to the front surface of the nozzle 21 , but the fixing position of the temperature sensor 22 is not limited to this embodiment.

[0084] In this method, if Figure 10-11 As shown, the temperature sensor 22 is fixed to the side of the nozzle 21. The side of the nozzle 21 refers to the surface other than the front surface of the nozzle, or the surface adjacent to the front surface. In this embodiment, the temperature sensor 22 is inserted and fixed to the side of the nozzle 21 from the outside of the nozzle 21, that is, the outer peripheral surface side of the nozzle toward the inside.

[0085] The temperature sensor 22 in the casting device 1 of this embodiment is inserted from the outside into the inside at the side of the nozzle 21. In the casting device 1 of this embodiment, the temperature sensor 22 can be provided to the molten metal cast from the nozzle 21 to reliably measure the temperature of the molten metal.

Claims

1. A casting device for casting molten metal into a casting mold, The casting device is characterized in that it has: a ladle having a nozzle and storing the molten metal; A tilting mechanism, wherein the tilting mechanism tilts the ladle; A moving mechanism, wherein the moving mechanism moves the ladle together with the tilting mechanism to a specified casting position; as well as A temperature sensor is provided at the nozzle of the ladle and measures the temperature of the molten metal through a temperature measuring portion immersed in the molten metal in the nozzle.

2. The casting device according to claim 1, characterized in that The temperature sensor is inserted from the outside of the nozzle toward the inside of the nozzle on a front surface facing downward when the nozzle is tilted or on a side surface other than the front surface.

3. The casting device according to claim 1, characterized in that: While the molten metal is being poured into the mold, the temperature measuring portion of the temperature sensor is always immersed in the molten metal.

4. The casting device according to claim 1, characterized in that: The temperature sensor includes a protection portion on the periphery of the temperature measuring portion. The protection part is formed of a carbon-containing refractory material. The carbon-containing refractory material, when its mass is set to 100 mass %, comprises: 10 mass % or more and 30 mass % or less of SiO2, 4 mass % to 15 mass % SiC, and 15 mass % or more and 35 mass % or less of C, The remainder includes one or more selected from Al2O3, MgO, and spinel.

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