JP6380587B1 - Molten metal water heater - Google Patents

Abstract

The present invention provides a hot water supply apparatus that can appropriately supply molten metal to a casting apparatus with a simple structure and can easily perform maintenance. A hot water supply apparatus (1) for supplying molten metal to a casting apparatus (3), a furnace installation (2) for heating and melting a metal material, and a transfer pipe (4) for transferring the molten metal from the furnace installation (2) to the casting apparatus (3). , A pressure feeding mechanism comprising a hot water supply pump 5 for pressure feeding the molten metal in the furnace equipment 2 to the transfer pipe 4, and a check valve 25 provided at an outlet portion of the transfer pipe 4. A valve case in which an introduction port communicating with the tip of the transfer pipe 4 is formed in the bottom wall, and a spherical valve body that is accommodated in the valve case and closes the introduction port by its own weight when the operation of the pumping mechanism is stopped. A water heater equipped with. [Selection] Figure 1

Description

  The present invention relates to a hot water supply apparatus for supplying a molten metal to a casting apparatus, for example, to a molten metal hot water supply apparatus for supplying various types of molten metal made of molten magnesium or the like to a casting apparatus via a transfer pipe.

  Conventionally, for example, as shown in Patent Document 1, a molten metal pot filled with molten metal, a molten metal pump provided in the molten metal pot, and a molten metal discharged from the molten metal pump are die-casting machines (casting apparatuses). A hot water supply apparatus for a die casting machine, wherein the hot water pump includes a cylinder having a suction port on a side wall and a piston that moves up and down in the cylinder. The bottom wall of the cylinder located below the suction port is provided with a suction opening for communicating the inside of the cylinder and the melt pot, and the suction opening is formed of a spherical valve body that opens and closes the suction opening. A valve provided with an on-off valve (hereinafter referred to as a spherical valve body) is known.

JP 2001-129651 A

  According to the molten metal hot water supply apparatus having the above-described configuration, even when the molten metal surface in the pouring pot is positioned lower than the suction port formed on the side wall of the molten metal pump, a desired amount of molten metal is die-cast. There is an advantage that hot water can be reliably supplied to the injection sleeve of the machine via the transfer pipe. On the other hand, it is inevitable that the peripheral surface of the spherical valve body is worn and damaged at an early stage, the valve function is impaired and the molten metal leaks easily, and the spherical valve body must be replaced frequently. There was a problem that had to be done.

  That is, a pouring pump is provided in the molten metal pot of the electric furnace, and a suction opening communicating with the inside of the cylinder and the molten metal pot is provided on the bottom wall of the cylinder constituting the molten metal pump, and the suction A spherical valve element that opens and closes the suction opening is disposed above the opening for use. And, according to the lifting and lowering operation of the piston constituting the hot water pump, after the spherical valve body is raised and the suction opening is opened, when the spherical valve body is lowered to close the suction opening, In addition to the pressing force of the piston and the dead weight of the spherical valve body, an excessive pressure due to the weight of the molten metal also acts. For this reason, there was a problem that the spherical valve body collided with the bottom wall of the cylinder with a strong force and the peripheral surface of the spherical valve body was easily damaged early.

  Further, since the spherical valve body is disposed near the bottom of the molten metal pot at a high temperature, it tends to be more easily damaged, and when replacing the damaged spherical valve element, After all the molten metal was discharged, a complicated operation of taking out the spherical valve element disposed at the lower end of the pouring pump and replacing it with a new spherical valve element had to be frequently performed.

  In the hot water supply device disclosed in Patent Document 1, a check valve driven by a motor is provided in the middle of a transfer pipe for transferring the molten metal in the pouring pot to the injection sleeve of the die casting machine. When the transfer of the molten metal is completed, the check valve is closed to prevent the reverse flow of the molten metal, thereby preventing the molten metal that has been exposed to the air from being oxidized and returned to the molten metal pot. It is comprised so that quality degradation of can be suppressed.

  However, the check valve driven by the motor has a problem that the structure is complicated and the manufacturing cost and running cost are high. Further, since the check valve is provided in the middle of the transfer pipe, it is inevitable that a large amount of the molten metal staying in the inclined pipe portion or the like located on the upstream side is oxidized and deteriorated. Therefore, a large amount of molten metal that has deteriorated may flow back into the molten pot when the check valve is reopened, or supplied to the casting device during the next casting, and impurities may enter the cast product. As a result, the quality of the cast product deteriorates.

  An object of the present invention is to provide a molten metal hot water supply apparatus that can appropriately supply molten metal to a casting apparatus with a simple structure and can easily perform maintenance.

  A molten metal hot water supply apparatus according to the present invention is a hot water supply apparatus for supplying molten metal to a casting apparatus, and furnace equipment for heating and melting a metal material, and transferring the molten metal from the furnace equipment toward the casting apparatus. A transfer pipe, a pressure feeding mechanism for pumping the molten metal in the furnace equipment to the transfer pipe, and a check valve provided at an outlet portion of the transfer pipe, and the check valve is provided at a tip of the transfer pipe. A valve case having a communicating introduction port formed in the bottom wall portion and a spherical valve body that is accommodated in the valve case and closes the introduction port by its own weight when the operation of the pumping mechanism is stopped.

  According to this configuration, when the molten metal is poured into the casting apparatus, when the pressure feeding mechanism is operated, the spherical valve body is pushed up by the pressure of the molten metal fed from the transfer pipe to the check valve. By automatically opening the case inlet, the molten metal introduced into the valve case can be supplied to the casting apparatus. And when pouring of the molten metal is finished and the operation of the pumping mechanism is stopped, the inlet of the valve case can be automatically closed by the dead weight of the spherical valve body, so the check valve is driven. Without providing a motor or the like, the airtightness in the transfer pipe located downstream of the check valve can be maintained with a simple configuration, and oxidation of the molten metal staying in the transfer pipe can be effectively suppressed. Further, since a check valve is provided at the outlet of the transfer pipe, the maintenance can be easily performed. In addition, the excessive pressure of the molten metal stored in the crucible does not act on the spherical valve body of the check valve as in the case where the check valve is arranged in the crucible or the like of the furnace equipment. It is possible to prevent the peripheral surface of the spherical valve body from being worn at an early stage due to the collision with the bottom wall plate of the valve case with a strong force.

  Here, it is desirable that the pumping mechanism includes a hot water supply pump for pumping the molten metal, and the furnace equipment is constituted by an open furnace.

  By configuring the furnace equipment as an open furnace in this way, it is possible to significantly reduce the production cost of the furnace equipment as compared with the case where the furnace equipment is configured with a closed furnace.

  Further, it is preferable that the spherical valve body is configured to be exchangeable through an upper end opening of the valve case.

  According to this configuration, it is possible to easily insert and remove the spherical valve body from the upper end opening of the valve case at the time of maintenance of the hot water supply apparatus, and it is possible to easily perform maintenance inspection work and replacement work.

  Further, the valve case of the check valve may be detachably attached to the mold of the casting apparatus, and the inside of the valve case may be in communication with the molding space of the mold.

  According to this configuration, since the valve case is attached to the mold of the casting apparatus, the casting apparatus and the transfer pipe are connected via the check valve. Therefore, from the check valve to the molding space of the mold. On the other hand, molten metal can be poured. And at the time of maintenance of the hot water supply device, the upper end of the valve case can be opened by separating the mold of the casting device and the check valve, so that the spherical valve body can be easily put in and out of the upper end opening. Is possible. Therefore, the spherical valve body can be easily taken out from the valve case, and its maintenance and inspection work and replacement work can be easily performed without requiring a complicated work such as discharging the molten metal in the molten metal pot.

  The check valve includes a closing plate that covers the upper end of the valve case so as to be openable and closable, and a pouring pipe that guides the molten metal introduced into the valve case toward the casting apparatus. Also good.

  According to this configuration, when pouring the molten metal into the casting apparatus, the molten metal is appropriately supplied to the casting apparatus such as a die casting machine having a hot water supply port while maintaining the airtightness in the transfer pipe. can do. Moreover, at the time of maintenance of the hot water supply apparatus, the spherical valve body can be easily taken out from the valve case by removing the closing plate from the upper end portion of the valve case and opening the upper end of the valve case.

  Further, it is desirable to have a structure further including an inert gas supply device for injecting an inert gas into the valve case.

  According to this configuration, by injecting the inert gas into the valve case, it is possible to effectively suppress the outside air from entering the valve case via the pouring pipe provided in the check valve. Therefore, there exists an advantage that it can suppress effectively that the molten metal in a valve case oxidizes.

  Here, it is desirable that the valve case is provided with a float that covers the upper surface of the molten metal introduced into the valve case.

  According to this structure, it can suppress effectively that the molten metal in a valve case oxidizes by covering the surface of the molten metal introduced in the valve case with a float.

  Further, an outlet portion of the transfer pipe for transferring the molten metal in the furnace equipment toward the casting apparatus is immersed in the molten metal in a storage pot provided in the casting apparatus, and a tip faces upward. It is good also as a structure which has the immersion part arrange | positioned in this way and was provided with the said non-return valve in the front-end | tip of the said immersion part.

  According to this configuration, by operating the pressure feeding mechanism, the inlet of the valve case is automatically opened by the pressure of the molten metal pumped from the transfer pipe to the check valve, and a necessary amount of the molten metal is supplied. It can be supplied and stored from the valve case to the storage pot of the casting apparatus. Then, when the operation of the pressure feeding mechanism is stopped, it is possible to prevent the molten metal in the storage pot from flowing back into the transfer pipe by automatically closing the inlet of the valve case by the weight of the spherical valve body. it can. Also, during maintenance of the hot water supply device, etc., the cover that covers the upper surface of the storage pot is removed, or the check valve is taken out from the storage pot of the casting device, so that the above-mentioned takeout from the upper end opening of the valve case to the inside Since the spherical valve body can be easily taken out by inserting a jig or the like, it is possible to easily replace the damaged spherical valve body.

  Moreover, it is good also as a structure by which the outlet for the molten metal which consists of a horizontal hole by which the diameter was set smaller than the diameter of a spherical valve body was formed in the surrounding wall part of the said valve case.

  According to this configuration, when the pressure feeding mechanism is activated, the metal molten metal introduced into the valve case is led out from the outlet into the storage pot of the casting apparatus, so that the metal fed from the transfer pipe into the check valve is pumped. The pumping force of the molten metal can be prevented from reaching the upper side of the outlet, and the spherical valve body can be prevented from jumping out of the valve case. Therefore, the spherical valve body can be stably held in the valve case without setting the vertical dimension of the valve case to a very large value.

  According to the molten metal hot water supply apparatus according to the present invention, the molten metal can be appropriately supplied to the casting apparatus with a simple structure, and maintenance of the hot water supply apparatus can be easily performed.

It is explanatory drawing which shows schematic structure of the hot-water supply apparatus of the molten metal which concerns on 1st embodiment of this invention. It is the II-II sectional view taken on the line of FIG. 1 which shows the specific structure of the pumping mechanism provided in the said hot water supply apparatus. FIG. 3 is a sectional view taken along line III-III in FIG. 2 showing a specific configuration of the pressure feeding mechanism. It is sectional drawing which shows the specific structure of the non-return valve provided in the said hot water supply apparatus. It is a front view which shows the specific structure of the taking-out jig | tool used when taking out a spherical valve body from the valve case of a non-return valve. It is sectional drawing which shows the specific structure of the holding part provided in the front-end | tip of the said taking-out jig | tool. It is a bottom view which shows the specific structure of the said holding part. It is explanatory drawing which shows schematic structure of the hot-water supply apparatus of the molten metal which concerns on 2nd embodiment. It is sectional drawing which shows the specific structure of the non-return valve provided in the said hot water supply apparatus. It is explanatory drawing which shows schematic structure of the hot-water supply apparatus of the molten metal which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the specific structure of the non-return valve provided in the said hot water supply apparatus.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing a schematic configuration of a molten metal hot water supply apparatus 1 according to the first embodiment, and FIG. 2 is a specific configuration of a pressure feeding mechanism including a hot water supply pump 5 provided in the hot water supply apparatus 1. FIG. 3 is a cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 3 is a cross-sectional view showing a specific structure of a check valve 25. FIG.

  A molten metal hot water supply apparatus 1 shown in FIG. 1 is a furnace facility 2 that generates and holds a molten metal by heating and melting a metal material made of magnesium alloy or aluminum alloy, and a metal in the furnace facility 2. A transfer pipe 4 for transferring the molten metal toward the casting apparatus 3 and a pumping mechanism including a hot water supply pump 5 for pumping the molten metal in the furnace equipment 2 to the transfer pipe 4 are provided.

  Any metal material that can be used for casting can be employed as the metal material, but light metal materials such as magnesium alloys and aluminum alloys can be suitably employed. In particular, a magnesium alloy is less reactive with a metal material than an aluminum alloy, and therefore, an inexpensive material such as a stainless steel material can be adopted as a material constituting the hot water supply device 1. This is preferable because the cost can be reduced and the casting can be made light.

  The furnace facility 2 includes a crucible 6 made of an aluminum titanate composite ceramic material or the like, and a stainless steel furnace lid 7 that covers the upper end of the furnace facility 2. The outer periphery of the crucible 6 is covered with a heat and heat insulation wall provided with a quartz castable or an alumina fiber paste-filled drying material.

  On the furnace lid 7, an ingot charging unit 8 is installed. A metal material made of magnesium ingot, return material, or the like charged into the crucible 6 from the ingot charging portion 8 is heated to an appropriate temperature by a heating element 9 such as an electric heater disposed on the outer peripheral portion of the crucible 6. As a result, molten metal is generated.

  As shown in FIGS. 2 and 3, the hot water supply pump 5 is a rotary pump mainly including a motor 10, an impeller shaft 11, a pump casing 12, and an impeller 13, and is attached to and detached from the furnace lid 7 via a mounting plate 14. It is attached as possible (see FIG. 1).

  The impeller 13 has a rotating plate fixed to the lower end portion of the impeller shaft 11, and a plurality of impellers are arranged on the upper surface so as to extend radially. The upper end portion of the impeller shaft 11 is connected to the rotor of the motor 10, and the impeller 13 is rotationally driven in the pump casing 12 by the motor 10. Thereby, the centrifugal force which sends the molten metal in the pump casing 12 to the discharge part 15 is generated (see arrow A in FIGS. 2 and 3), and the molten metal in the crucible 6 is pumped from the discharge part 15 to the transfer pipe 4. It is comprised so that.

  The transfer pipe 4 extends in a state in which the vertical portion 17 is installed so as to extend upward from the insertion port 16 provided in the discharge portion 15 of the hot water supply pump 5, and an upwardly inclined state from the upper end portion to the side. It has the inclination part 18 and the curved part 19 extended while curving upward from the front-end | tip. The upper part of the vertical part 17, the inclined part 18 and the curved part 19 are each covered with a heat retaining member 20 having a heating element such as an electric heater for heating (see FIG. 4).

  As shown in FIG. 4, a check valve 25 having a spherical valve body 23 and a valve case 24 for housing the spherical valve body 23 is attached to the outlet portion of the transfer pipe 4, that is, the upper end portion of the bending portion 19. It has been. The spherical valve body 23 is formed in a substantially spherical shape with a stainless material or the like, and the surface thereof is subjected to immersion nitriding treatment or fluorination substitution nitriding treatment for improving the surface hardness of the spherical valve body 23. Yes. By this surface treatment, it is possible to suppress damage to the spherical valve body 23 during pickling work performed after the spherical valve body 23 is taken out from the valve case 24, or during work for removing oxides of the adhered molten metal. It has become.

  The valve case 24 of the check valve 25 has a peripheral wall portion 26 formed to a predetermined length by a cylindrical body having an inner diameter slightly larger than the diameter of the spherical valve body 23, and a bottom wall portion 27 covering the bottom surface. A mounting flange 28 is provided at the upper end portion of the peripheral wall portion 26. As will be described later, the mounting flange 28 is configured to be detachably attached to the casting apparatus 3 with a predetermined pressing force or by bolting. Further, the outer periphery of the peripheral wall portion 26 is covered with a heat retaining member 29 having a heating element such as an electric heater for heating.

  When the molten metal is poured from the hot water supply device 1 to the casting device 3, the spherical valve body 23 is prevented from jumping out of the valve case 24, and the spherical valve body is used during maintenance of the hot water supply device 1 described later. In order to facilitate the replacement operation of the valve 23, it is desirable to set the vertical dimension H of the valve case 24 within a predetermined length. For example, in the check valve 25 including the spherical valve body 23 having a diameter of about 50 mm, the vertical dimension H of the valve case 24 is set within a range of 100 mm to 200 mm, that is, twice the diameter of the spherical valve body 23. It is desirable to set within a range of ˜4 times.

  The mounting flange 28 provided at the upper end portion of the valve case 24 has an opening 36 having an inner diameter slightly larger than the diameter of the spherical valve body 23 and communicating with the upper end portion of the peripheral wall portion 26. . Further, a circular inlet 21 having an inner diameter smaller than the diameter of the spherical valve body 23 and communicating with the tip of the transfer pipe 4 is formed in the bottom wall portion 27 located at the lower end portion of the valve case 24. Yes.

  With the above-described configuration, when the hot water supply pump 5 is not in operation, the introduction port 21 provided in the bottom wall portion 27 of the valve case 24 is held in a state of being closed by the weight of the spherical valve body 23. On the other hand, when the hot water supply pump 5 is operated, the spherical valve body 23 is pushed up by the pumping force of the molten metal pumped to the transfer pipe 4 (see arrow B in FIG. 4), and the inlet 21 is opened. From 4, molten metal is introduced into the valve case 24.

  The casting apparatus 3 includes a mold 30 including an upper mold 31 and a lower mold 32, a support substrate 33 that supports the lower mold 32, and a lift drive mechanism (not shown) that drives the upper mold 31 to move up and down. The mold 31 and the lower mold 32 form a molding space including a cavity 34 for molding a cast product. Further, the lower mold 32 is formed with a molten metal injection port 35 communicating with the opening 36 of the mounting flange 28 located at the upper end of the check valve 25.

  When a cast product is formed by pouring a molten metal into the casting apparatus 3 using the hot water supply apparatus 1, first, a metal material is charged into the crucible 6 from the ingot charging portion 8 of the furnace equipment 2. And a metal material is heated with the heating element 9 installed in the outer periphery of the crucible 6, and the molten metal of predetermined temperature is formed.

  Next, the motor 10 of the hot water supply pump 5 is operated to rotationally drive the impeller shaft 11 and the impeller 13, so that the molten metal in the crucible 6 introduced into the pump casing 12 is discharged from the discharge portion 15 of the hot water supply pump 5. Pump to transfer tube 4. As a result, the molten metal in the crucible 6 is transferred from the vertical portion 17 of the transfer pipe 4 to the check valve 25 via the inclined portion 18 and the curved portion 19 by the pumping force of the hot water supply pump 5.

  The spherical valve body 23 in the valve case 24 is pushed up by the pumping force of the molten metal transferred from the transfer pipe 4 to the check valve 25, and the inlet 21 of the bottom wall portion 27 is opened. A molten metal is introduced into the valve case 24. Next, the molten metal is poured into the cavity 34 from the opening 36 of the mounting flange 28 provided at the upper end of the valve case 24 through the molten metal inlet 35 of the mold 30.

  When pouring of the molten metal into the molding space formed by the cavity 34 of the mold 30 is finished and the operation of the hot water supply pump 5 is stopped, the pumping force of the molten metal that pushes up the spherical valve body 23 in the valve case 24 disappears. As a result, due to the dead weight of the spherical valve body 23, the lower surface thereof is pressed against the bottom wall portion 27 of the valve case 24, the inlet 21 is closed, and pouring of the mold 30 into the cavity 34 is stopped. The airtightness in the transfer pipe 4 located on the downstream side of the stop valve 25 is maintained.

  By maintaining the airtightness in the transfer pipe 4 in this way, generation of oxides caused by the molten metal introduced into the transfer pipe 4 coming into contact with the outside air is suppressed. Further, since the molten metal in the transfer pipe 4 and the valve case 24 can be heated by a heating element such as an electric heater of the heat retaining member 20 and maintained in an appropriate molten state, the hot water supply pump 5 is used at the next casting. Together with the new molten metal pumped from, it can be poured into the cavity 34 of the mold 30 and used for casting.

  The hot water supply apparatus 1 according to the present invention includes a furnace facility 2 that heats and melts a metal material as described above, a transfer pipe 4 that transfers the molten metal from the furnace facility 2 toward the casting apparatus 3, A pressure feeding mechanism comprising a hot water supply pump 5 for pressure feeding the molten metal to the transfer pipe 4 and a check valve 25 provided at the outlet of the transfer pipe 4 are provided. The check valve 25 communicates with the tip of the transfer pipe 4. A valve case 24 having an inlet 21 formed in the bottom wall portion 27 and a spherical valve body 23 which is accommodated in the valve case 24 and closes the inlet 21 when the hot water supply pump 5 is stopped. Therefore, there is an advantage that the molten metal can be appropriately supplied to the casting apparatus 3 with a simple structure, and the check valve 25 can be easily maintained.

  That is, when pouring the molten metal by transferring the molten metal toward the casting apparatus 3, the metal fed from the transfer pipe 4 to the check valve 25 by operating the pressure feeding mechanism including the hot water supply pump 5. By pushing up the spherical valve body 23 by the pumping force of the molten metal, the inlet 21 provided in the bottom wall portion 27 of the valve case 24 is automatically opened, and the molten metal is introduced into the valve case 24, The molten metal can be poured into the cavity 34 through the molten metal inlet 35 of the mold 30 from the upper end opening 24.

  In addition, when pouring of the molten metal into the cavity 34 is finished and the operation of the hot water supply pump 5 is stopped, the inlet 21 of the valve case 24 can be automatically closed by the dead weight of the spherical valve body 23. Therefore, without providing an actuator such as a motor or a cylinder for driving the check valve 25, the airtightness in the transfer pipe 4 located on the downstream side of the check valve 25 is maintained with a simple configuration, and this transfer pipe is maintained. The oxidation of the molten metal staying in 4 can be effectively suppressed.

  And since it was set as the structure which provided the check valve 25 in the exit part of the said transfer pipe 4, the maintenance can be performed easily. Moreover, excessive pressure of the molten metal stored in the crucible 6 acts on the spherical valve body of the check valve as in the case where the check valve provided in the crucible 6 of the furnace facility 2 is arranged. There is no such a problem that the spherical valve body collides with the bottom wall plate of the valve case with a strong force, so that the peripheral surface of the spherical valve body is worn away at an early stage.

  Further, upstream of the check valve as in the prior art (see Patent Document 1) in which a check valve driven by a motor is provided in the middle of a transfer pipe for transferring the molten metal in the pouring pot to the die casting machine. There is no case where a large amount of molten metal staying in the metal oxidizes and deteriorates. For this reason, at the time of the next casting, a large amount of molten metal in a deteriorated state does not flow back into the molten metal pod and is not supplied to the casting apparatus 3, and it is easy to deteriorate the quality of the cast product due to these. It can suppress reliably by a structure.

  Moreover, in the hot water supply device 1 according to the first embodiment, the spherical valve body 23 is configured to be exchangeable through the upper end opening of the valve case 24, so that the spherical valve is opened from the upper end opening of the valve case 24 during maintenance of the hot water supply device 1 or the like. The body 23 can be easily taken in and out, and the maintenance inspection work and the exchange work can be easily performed.

  Specifically, the check valve 25 provided at the outlet portion of the transfer pipe 4 includes a mounting flange 28 that is detachably attached to the casting apparatus 3, and the diameter of the spherical valve element 23 is attached to the mounting flange 28. Since the opening 36 that has a larger inner diameter and communicates with the upper end portion of the peripheral wall portion 26 is formed, the mounting flange 28 is attached to the lower end portion of the casting apparatus 3, thereby casting through the check valve 25. By connecting the apparatus 3 and the transfer pipe 4, molten metal can be poured into the cavity 34 of the mold 30.

  And when performing maintenance of the hot water supply device 1, the upper end of the valve case 24 can be opened by removing the mounting flange 28 from the mold 30 and separating the mold 30 and the check valve 25. Therefore, the spherical valve body 23 can be easily inserted and removed from the upper end opening of the valve case 24. Therefore, the spherical valve body 23 can be easily taken out from the valve case 24 and maintenance, inspection, replacement work, etc. can be easily performed without requiring a complicated operation such as discharging the molten metal in the molten metal pot. it can.

  FIG. 5 is a front view showing the configuration of the take-out jig 40 used when taking out the spherical valve element 23 from the valve case 24, and FIGS. 6 and 7 show the holding provided at the tip of the take-out jig 40. It is sectional drawing and bottom view which show the structure of a holding part.

  The take-out jig 40 includes a pair of flat bars 41 and 41 that are phase-coupled at the base end portion, a holding portion that includes a pair of gripping members 42 and 42 that are respectively attached to the distal ends thereof, and the flat bars 41 and 41. And a round pipe member 43 that is externally fitted. The flat bars 41, 41 are pivoted and displaced with their base ends as fulcrums, so that the distal ends thereof and the gripping members 42, 42 are brought close to each other from the expanded state separated from each other by a predetermined distance. It is comprised so that it may transfer to the holding state which hold | grips the body 23. FIG.

  The gripping member 42 is formed in a bowl shape having a predetermined length having a semicircular cross-sectional shape, and the radius thereof is formed to be larger toward the distal end side. Thus, a holding opening that is fitted onto the spherical valve body 23 is formed between the distal ends of the left and right grip members 42, 42. And the rib which comprises the taper surface 44 which spreads forward is attached to the outer peripheral surface of the right-and-left holding members 42 and 42, respectively. In addition, a pair of protrusions 45, 45 that prevent the spherical valve body 23 from dropping off are provided on the inner peripheral surfaces of the distal ends of the gripping members 42, 42, respectively.

  The inner diameter of the round pipe member 43 is set larger than the outer diameter on the proximal end side of the gripping members 42, 42 and smaller than the outer diameter on the distal end side of the gripping members 42, 42. As a result, the round pipe member 43 is configured to be fitted onto the base end portions of the gripping members 42 and 42, and from this state, as indicated by an arrow C in FIG. By sliding the round pipe member 43, the tip of the round pipe member 43 is brought into pressure contact with the tapered surface 44.

  When the spherical valve body 23 is taken out from the valve case 24 using the take-out jig 40, first, the mounting flange 28 is removed from the mold 30 to separate the mold 30 and the check valve 25, With the upper part of the check valve 25 opened, the take-out jig 40 gripping members 42, 42 are inserted into the valve case 24 from the opening 36 of the mounting flange 28 located at the upper end of the valve case 24. The holding opening provided at the tip is externally fitted to the spherical valve body 23.

  Next, the round pipe member 43 is moved along the flat bars 41 and 41 to the tip side thereof, and the tip of the round pipe member 43 is pressed against the tapered surface 44 of the gripping members 42 and 42, and the arrow C in FIG. Slide it in the direction. As a result, the tips of the flat bars 41 and 41 and the gripping members 42 and 42 approach each other from the separated state, and the protrusions 45 and 45 provided on the gripping members 42 and 42 contact the lower peripheral surface of the spherical valve body 23. It shifts to the holding state in contact. Thus, the spherical valve body 23 can be easily taken out from the valve case 24 by lifting the extraction jig 40 in a state where the spherical valve body 23 is held by the holding portion of the extraction jig 40.

  The hot water supply apparatus 1 according to the present invention is not limited to a magnesium alloy, and can be widely applied to a casting apparatus 3 that uses various types of molten metal made of an aluminum alloy or the like as a material. In particular, a magnesium alloy is used as a material. It is suitably used as a casting apparatus 3 for

  That is, the magnesium alloy has the advantage of being lightweight and highly rigid, but has the disadvantage that quality deterioration is likely to occur due to the generation of oxide during casting. Therefore, as described above, the introduction port 21 communicating with the tip of the transfer pipe 4 is formed in the bottom wall portion 27 and the valve case 24 is accommodated in the valve case 24 and introduced by its own weight when the operation of the hot water supply pump 5 is stopped. By providing a check valve 25 provided with a spherical valve body 23 for closing the port 21 at the outlet of the transfer pipe 4, the airtightness in the transfer pipe 4 located on the downstream side is maintained, and this transfer pipe is maintained. It is preferable to employ a configuration in which the oxidation of the molten metal made of a magnesium alloy staying in 4 can be effectively suppressed.

  Moreover, although the example which used the rotary pump which has the impeller 13 was demonstrated as a pumping mechanism which consists of the hot water supply pump 5 which pumps the molten metal in the furnace equipment 2 to the transfer pipe 4, it is not restricted to this, The reciprocating pump which uses a piston Alternatively, various pumping mechanisms such as a bellows pump using a bellows can be used.

  Since the molten metal is pumped to the casting apparatus 3 by the hot water supply pump 5, the furnace equipment 2 can be configured as an open furnace, and the production cost can be significantly reduced as compared with the case where the furnace equipment 2 is configured as a closed furnace. .

(Second embodiment)
FIG. 8 is an explanatory view showing a schematic configuration of a hot water supply apparatus 1a according to the second embodiment of the present invention, and FIG. 9 shows a specific structure of a check valve 25a provided at the outlet of the transfer pipe 4a. It is sectional drawing. The hot water supply apparatus 1a according to the second embodiment includes a furnace facility 2a having a crucible 6a and the like, and a pressure feeding mechanism including a hot water supply pump 5a and the like, similar to the hot water supply apparatus 1 in the first embodiment.

  As shown in FIG. 8, the transfer pipe 4a for transferring the molten metal accommodated in the crucible 6a of the furnace facility 2a toward the injection sleeve 50a of the casting apparatus 3a has a vertical portion extending upward from the discharge portion of the hot water supply pump 5a. 17a, an inclined portion 18a extending in an upwardly inclined manner from the tip thereof to the side, and a bending portion 19a extending while bending upward from the tip of the inclined portion 18a.

  As shown in FIG. 9, a check valve 25a having a spherical valve body 23a and a valve case 24a for accommodating the spherical valve body 23a is provided at the outlet of the transfer pipe 4a, that is, at the upper end of the curved portion 19a. Is provided. Further, the outer peripheral surfaces of the transfer pipe 4a and the check valve 25a are covered with heat retaining members 20a and 29a having heating elements such as an electric heater for heating as in the first embodiment.

  The check valve 25a according to the second embodiment is different from the check valve 25 of the first embodiment in that a float 22a is disposed above the spherical valve body 23a. The float 22a is formed into a rugby ball shape in which a planar shape is formed into a disk shape and a center portion of the cross-sectional shape swells with a material having a specific gravity lower than that of the molten metal, such as calcia (CaO) ceramic. ing. Further, the outer diameter of the float 22a is set to a dimension corresponding to the inner diameter of the valve case 24a, specifically, the same dimension as the inner diameter of the peripheral wall portion 26a, or a dimension slightly smaller than that. The surface of the molten metal introduced into 24a is configured to be covered with the float 22a.

  Further, the valve case 24a of the check valve 25a is similar to the valve case 24 of the first embodiment in that the peripheral wall portion 26a made of a cylindrical body, the bottom wall portion 27a covering the bottom surface, and the upper end portion of the peripheral wall portion 26a. And a mounting flange 28a. A closing plate 38a is detachably attached to the upper portion of the mounting flange 28a located at the upper end of the check valve 25a by bolting or the like, and a molten metal is applied to the peripheral wall portion 26a of the valve case 24a. A pouring pipe 39a led out toward the injection sleeve 50a of the casting apparatus composed of a die-casting machine protrudes, and is different from the check valve 25 of the first embodiment in these points.

  The closing plate 38a is attached so as to cover the upper surface of the opening 36a formed in the attachment flange 28a, and thus has a function of closing the upper end opening of the valve case 24a at the normal time. On the other hand, at the time of maintenance of the hot water supply apparatus 1a, the upper end of the valve case 24a can be opened by removing the closing plate 38a from the valve case 24a. The closing plate 38a is provided with an inert gas injection pipe 46a for injecting an inert gas made of SF6 or the like into the valve case 24a. Then, by injecting an inert gas such as SF6 into the valve case 24a through the injection pipe 46a from an inert gas supply device (not shown), the molten metal introduced into the valve case 24a is oxidized. Can be prevented.

  The pouring pipe 39a protrudes from the outlet port 52a formed in the peripheral wall portion 26a of the valve case 24a so as to incline forward and the tip of the pouring pipe 39a of the injection sleeve 50a of the die casting machine constituting the casting apparatus 3a. It arrange | positions so that the hot water supply port 51a formed in the upper surface may be faced. The installation height Ha of the outlet 52a is set so that the upper end of the float 22a accommodated in the valve case 24a and the lower end of the outlet 52a are substantially at the same position.

  In the above-described configuration, when the pressure feeding mechanism including the hot water supply pump 5a is operated, the spherical valve body 23a and the float 22a are pushed up by the pressure feeding force of the molten metal transferred from the transfer pipe 4a to the check valve 25a. The inlet 21a provided in the bottom wall portion 27a of the valve case 24a is automatically opened, and the molten metal is introduced into the valve case 24a. Then, while an inert gas such as SF6 is injected into the valve case 24a through the injection pipe 46a, the injection is made from the outlet 52a of the valve case 24a through the pouring pipe 39a as shown by an arrow D in FIG. The molten metal is poured into the hot water supply port 51a of the sleeve 50a.

  When pouring of the molten metal into the injection sleeve 50a is finished and the operation of the hot water supply pump 5a is stopped, the introduction port 21a of the valve case 24a is automatically closed by the dead weight of the spherical valve body 23a, and the check valve The airtightness in the transfer pipe 4a located on the downstream side of 25a is maintained. Further, the surface of the molten metal introduced into the valve case 24a is covered with the float 22a.

  In this way, the check valve 25a is provided with a closing plate 38a that covers the upper end opening of the valve case 24a so that it can be opened and closed, and a pouring pipe 39a that guides the molten metal introduced into the valve case 24a toward the injection sleeve 50a. In this case, the molten metal is properly used for the injection sleeve 50a of the casting apparatus composed of the die casting machine whose upper surface is opened through the hot water supply port 51a while maintaining the airtightness in the transfer pipe 4a. Hot water can be supplied.

  During maintenance of the check valve 25a, the valve is removed by removing the closing plate 38a from the mounting flange 28a and opening the upper end of the valve case 24a, thereby sucking the float 22a using a suction device (not shown). After taking out from the case 24a, the spherical valve body 23a can be easily taken out from the upper end opening of the valve case 24a using the take-out jig 40 or the like.

  Further, in the molten metal hot water supply device 1a according to the second embodiment, since the inert gas is supplied into the valve case 24a through the injection pipe 46a by an inert gas supply device (not shown), the peripheral wall portion Despite the provision of the pouring pipe 39a at 26a, it is possible to effectively prevent the outside air from entering the valve case 24a from the pouring pipe 39a, and the molten metal introduced into the valve case 24a is oxidized. There is an advantage that can be effectively suppressed.

  Further, as described above, the float 22a is formed above the spherical valve body 23a with a material having a specific gravity lighter than that of the molten metal, and the outer diameter is set to a value corresponding to the inner diameter of the valve case 24a. According to the structure, it is possible to effectively suppress the molten metal in the valve case 24a from being oxidized by covering the surface of the molten metal introduced into the valve case 24a with the float 22a.

  In particular, as shown in the second embodiment, the installation height Ha of the outlet port 52a formed in the peripheral wall portion 26a of the valve case 24a is set to the upper end position of the float 22a accommodated in the valve case 24a and the outlet port 52a. Is set so that the lower end position is substantially the same height, the pressure feeding mechanism of the hot water supply pump 5a is operated to activate the pressure feeding force of the molten metal transferred from the transfer pipe 4a to the check valve 25a. By slightly pushing up the float 22a, the molten metal in the valve case 24a can be smoothly led out from the outlet 52a toward the pouring pipe 39a and properly supplied to the hot water supply port 51a of the injection sleeve 50a. it can.

  Moreover, when the operation of the hot water supply pump 5a is stopped, the introduction port 21a of the valve case 24a can be automatically closed by the dead weight of the spherical valve body 23a, and the outlet port 52a is opened from the pouring pipe 39a. Since the float 22a can prevent the air that has entered the valve case 24a from moving to the lower side of the valve case 24a, the surface of the molten metal in the valve case 24a is effectively oxidized. Can be prevented.

  And since the molten metal is pumped to the casting apparatus 3a by the hot water supply pump 5a, the furnace equipment 2a can be configured as an open furnace, and the production cost can be significantly reduced as compared with the case where the furnace equipment 2a is configured as a closed furnace. Can do.

  The molten metal hot water supply apparatus 1a according to the second embodiment is not limited to the die casting machine including the injection sleeve 50a, but can be applied to various casting apparatuses having other structures. It can be suitably used for an open type casting apparatus that can be suppressed at low cost, that is, the die casting machine that does not require a high degree of airtightness, or a gravity casting machine that fills a metal mold with its own weight of molten metal.

(Third embodiment)
FIG. 10 is an explanatory view showing a schematic configuration of a hot water supply apparatus 1b according to the third embodiment of the present invention, and FIG. 11 is a cross-sectional view showing the structure of a check valve 25b provided at the outlet of the transfer pipe 4b. It is. Similar to the hot water supply apparatus 1 in the first embodiment, the hot water supply apparatus 1b according to the third embodiment includes a furnace facility 2b having a crucible 6b and the like, and a pressure feeding mechanism including a hot water supply pump 5b and the like.

  As shown in FIG. 10, the transfer pipe 4b for transferring the molten metal in the furnace equipment 2b toward the casting apparatus 3b includes a first vertical portion 17b extending upward from the discharge portion of the hot water supply pump 5b, and a side from the tip thereof. And a second vertical portion 19b extending downward from the tip of the inclined portion 18b. The lower portion of the second vertical portion 19b is a casting apparatus. It is introduced into a storage pot 55b provided in 3b.

  At the lower end of the second vertical portion 19b, as shown in FIG. 11, a third vertical portion 52b extending downward via a connection bracket 51b and a side view connected to the lower end are U-shaped. The formed curved portion 53b is provided, so that the immersion portion is formed so as to be immersed in the molten metal in the storage pot 55b and the tip is directed upward. As shown in FIG. 11, a spherical valve body 23b and a valve case 24b for housing the spherical valve body 23b are provided at the outlet of the transfer pipe 4b, that is, at the upper end of the U-shaped curved portion 53b. A check valve 25b is attached.

  The check valve 25b according to the third embodiment includes only a peripheral wall portion 26b whose valve case 24b is a cylindrical body and a bottom wall portion 27b that covers the bottom surface thereof. In the peripheral wall portion 26b, a lead-out port 54b composed of a plurality of horizontal holes having a diameter smaller than the diameter of the spherical valve body 23b is formed at a predetermined position. The molten metal transferred into the check valve 25b through the transfer pipe 4b is led out into the storage pot 55b of the casting apparatus 3b from the outlet 54b.

  The casting apparatus 3b includes a mold 30b composed of an upper mold 31b and a lower mold 32b, an unshown pressurizing mechanism for supplying a non-oxidizing gas such as nitrogen gas or argon gas into the storage pot 55b, and a storage. The stalk 56b has a pair of stalks 56b and 56b that allow the pot 55b and the mold 30b to communicate with each other, and a non-oxidizing gas is supplied from the pressurizing mechanism into the storage pot 55b to increase the internal pressure. , 56b, and a low pressure casting apparatus for supplying the molten metal in the storage pot 55b into the mold 30b.

  In the above-described configuration, when the pressure feeding mechanism composed of the hot water supply pump 5b is operated, the spherical valve body 23b is pushed up by the pressure of the molten metal transferred from the transfer pipe 4b to the check valve 25b, whereby the bottom of the valve case 24b The inlet 21b provided in the wall 27b is automatically opened, and the molten metal introduced into the valve case 24b is led out from the outlet 54b to the storage pot 55b and stored.

  When the operation of the hot water supply pump 5b is stopped when a predetermined amount of the molten metal is stored in the storage pot 55b, the pressure of the molten metal that pushes up the spherical valve body 23b disappears. Since the lower surface thereof is pressed against the bottom wall portion 27b of the valve case 24b and the introduction port 21b is closed, the molten metal in the storage pot 55b is prevented from flowing back into the transfer pipe 4b.

  Next, by operating the pressurizing mechanism of the casting apparatus 3b to supply a non-oxidizing gas such as nitrogen gas or argon gas into the storage pot 55b and increasing the internal pressure of the storage pot 55b, the stalk 56b, The molten metal in the storage pot 55b is supplied into the molding space formed by the cavity of the mold 30b through 56b and casting is performed.

  As described above, the molten metal in the furnace equipment 2b is introduced into the storage pot 55b provided in the casting apparatus 3b and immersed in the molten metal at the outlet of the transfer pipe 4b for transferring the molten metal toward the casting apparatus 3b. A structure in which a U-shaped curved portion 53b is provided, and a check valve 25b provided with a spherical valve body 23b for closing the introduction port 21b formed in the bottom wall portion 27b of the valve case 24b by its own weight is provided at the tip thereof. According to this, by operating the pressure feeding mechanism comprising the hot water supply pump 5b during the pouring of the molten metal, the inlet 21b of the valve case 24b is automatically set by the pressure of the molten metal fed from the transfer pipe 4b to the check valve 25b. The required amount of molten metal can be supplied from the valve case 24b to the storage pot 55b and stored.

  And, when pouring of the molten metal into the casting apparatus 3b is finished and the operation of the hot water supply pump 5b is stopped, the inlet 21b of the valve case 24b is automatically closed by the dead weight of the spherical valve body 23b, It is possible to prevent the molten metal in the storage pot 55b from flowing back into the transfer pipe 4b. Therefore, it is possible to reliably prevent the quality of the molten metal from being deteriorated due to the oxide generated in the storage pot 55b flowing back to the furnace facility 2b through the transfer pipe 4b.

  Moreover, when performing maintenance of the hot water supply device 1b, a state in which the cover that covers the upper surface of the storage pot 55b provided in the casting device 3b is removed or the check valve 25b is taken out of the storage pot 55b of the casting device 3b. Thus, since the spherical valve body 23b can be easily taken out by inserting the take-out jig 40 into the inside from the upper end opening of the valve case 24b, the replacement work of the damaged spherical valve body 23b is easily performed. be able to.

  Furthermore, in the third embodiment, a lead-out port 54b made of a horizontal hole whose diameter is set smaller than the diameter of the spherical valve body 23b is formed at a predetermined position of the peripheral wall portion 26b constituting the valve case 24b of the check valve 25b. Therefore, the molten metal introduced into the valve case 24b can be led out from the outlet 54b into the storage pot 55b of the casting apparatus 3b when the pressure feeding mechanism including the hot water supply pump 5b is operated. This suppresses the pumping force of the molten metal pumped into the check valve 25b from the transfer pipe 4b from reaching the upper side of the outlet 54b, and the spherical valve body 23b jumps out of the valve case 24b. Can be prevented.

  Therefore, the spherical valve body 23b can be stably held in the valve case 24b without setting the vertical dimension of the valve case 24b to a very large value. Moreover, by changing the distance Hb from the bottom wall portion 27b of the valve case 24b to the lower end portion of the outlet 54b, the floating height of the spherical valve body 23b in the valve case 24b corresponding to the internal pressure of the storage pot 55b. There is an advantage that the flow rate of the molten metal supplied from the hot water supply device 1b to the casting device 3b can be adjusted by changing the thickness.

  Furthermore, since the molten metal is pumped to the casting apparatus 3b by the hot water supply pump 5b, the furnace equipment 2b can be configured as an open furnace, and the production cost can be significantly reduced as compared with the case where the furnace equipment 2b is configured as a closed furnace. Can do.

  The present invention is not limited to supplying molten metal to the casting apparatuses 3, 3a, and 3b shown in each of the above embodiments, and supplies molten metal to various casting apparatuses having other configurations. It is applicable to a hot water supply device.

1, 1a, 1b Hot water supply device 2, 2a, 2b Furnace equipment 3, 3a, 3b Casting device 4, 4a, 4b Transfer pipe 5, 5a, 5b Hot water supply pump (pressure feed mechanism)
22a Float 23, 23a, 23b Spherical valve body 24, 24a Valve case 25, 25a, 25b Check valve 26, 26a, 26b Peripheral wall portion 27, 27a, 27b Bottom wall portion 28 Mounting flange 38a Closing plate 39a Pouring pipe 46a No Active gas injection pipe (Inert gas supply device)
50a Injection sleeve (casting equipment)
54a Outlet

Claims (8)

A hot water supply apparatus for supplying a molten metal to a casting apparatus, comprising a furnace facility for heating and melting a metal material, a transfer pipe for transferring the molten metal from the furnace facility to the casting apparatus, and a molten metal in the furnace facility. A pressure feeding mechanism for pressure feeding to the transfer pipe; and a check valve provided at an outlet of the transfer pipe;
The check valve comprises a valve case and a spherical valve body, the bottom wall portion of the valve casing, the inlet port communicating with the distal end of the transfer tube is made form, the spherical valve body, said pumping mechanism Stored in the valve case so as to close the inlet by its own weight when the operation is stopped ,
The molten metal hot water supply apparatus, wherein the pressure feeding mechanism includes a hot water supply pump for pumping the molten metal, and the furnace equipment is an open furnace . The spherical valve body, water heater molten metal according to claim 1, characterized in that the exchangeable constructed through the upper end opening of the valve case. 3. The molten metal according to claim 1, wherein a valve case of the check valve is detachably attached to a mold of the casting apparatus, and an interior of the valve case is communicated with a molding space of the mold. Water heater. The check valve covers the upper end of the valve case so as to be openable and closable;
The valve introduced water heater molten metal according to claim 1 or 2 wherein the molten metal comprises a pouring tube for deriving toward the casting equipment case. The hot water supply apparatus for molten metal according to claim 4, further comprising an inert gas injection device for injecting an inert gas into the valve case. The molten metal hot water supply apparatus according to claim 4 or 5, wherein a float that covers an upper surface of the molten metal introduced into the valve case is disposed in the valve case. An outlet portion of the transfer pipe for transferring the molten metal in the furnace equipment toward the casting apparatus is immersed in the molten metal in a storage pot provided in the casting apparatus, and the tip is directed upward. Having an immersion part arranged;
The tip of the immersion unit, water heater molten metal according to claim 1 or 2 wherein said check valve is provided. The molten metal hot water supply apparatus according to claim 7, wherein an outlet port for the molten metal is formed in the peripheral wall portion of the valve case. The outlet port is formed of a horizontal hole whose diameter is set smaller than the diameter of the spherical valve body.

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