JP5031268B2 - Hot water supply control device - Google Patents

Description

  The present invention relates to a hot water supply amount control device for supplying a predetermined amount of molten metal to an injection sleeve communicating with a cavity formed in a mold.

  Various techniques have been proposed as such a hot water supply amount control device.

  In the technique of Patent Document 1, the first pressurizing chamber 3 (the molten metal holding chamber), the second pressurizing chamber 5 communicating with the first pressurizing chamber and the injection sleeve 27 are disposed in the pressurized pouring furnace 1 that accommodates the molten metal. (Melt measuring chamber) and a spindle 21 for opening and closing the communication port 14 between the first pressurizing chamber 3 and the second pressurizing chamber 5 are provided. The pressurized pouring furnace 1 supplies the pressurized gas into the first pressurizing chamber 3 with the communication port 14 open, and pushes out the molten metal in the first pressurizing chamber 3, thereby causing the inside of the second pressurizing chamber 5. The hot water level is raised to a predetermined hot water level. Next, the pressurized pouring furnace 1 closes the communication port between the first pressurizing chamber 3 and the second pressurizing chamber 5 by the spindle 21 and supplies the pressurized gas into the second pressurizing chamber 5 to provide the second The molten metal in the pressurizing chamber 5 is pushed out to supply the injection sleeve. As described above, the technique disclosed in Patent Document 1 supplies the molten metal from the first pressurizing chamber 3 to the second pressurizing chamber 5 so that the level of the molten metal surface in the second pressurizing chamber 5 is kept constant. A fixed amount of molten metal is realized from the pressure chamber 5 to the injection sleeve 27.

  The technique of Patent Document 2 provides a pressurizing chamber 6 (molten metering chamber) in the holding furnace 1, supplies pressurized gas to the pressurizing chamber 6, and pushes out the molten metal in the pressurizing chamber 6. The mold 16 is supplied. A metal inflow passage 9 that connects the holding furnace 1 and the pressurizing chamber 6 extends downward from the communication position of the pressurizing chamber 6 and communicates with the holding furnace 1. When supplying pressurized gas to the pressurizing chamber 6 and supplying molten metal to the mold 16, the molten metal surface of the metal inflow passage 9 moves between the pressurizing chamber 6 and the holding furnace 1. As described above, the technique of Patent Document 2 prevents the pressurized gas from entering the holding furnace 1 by causing the molten metal to function as a plug for the metal inflow passage 9.

  The technique of Patent Document 3 includes a sealed furnace body 60 (a molten metal holding chamber), a molten metal pumping chamber 64 (a molten metal measuring chamber) communicating with the sealed furnace body 60 and the injection sleeve 22, a sealed furnace body 60 and a molten metal pumping chamber 64. The first overflow means 72 and the second overflow means 74 provided between the two are provided. The technique of Patent Document 3 raises the molten metal pumping chamber 64 by supplying pressurized gas to the sealed furnace body 60 and pushing out the molten metal in the sealed path body 60. The molten metal in the molten metal pumping chamber 64 overflows from the molten metal pumping chamber 64 and is returned to the sealed furnace body 60 when the molten metal surface exceeds the height defined by the first overflow means 72, and the molten metal pumping chamber 64 has a predetermined molten metal surface. Maintained at a level of. Thereafter, the pressurized gas is supplied to the molten metal drawing chamber 64, the molten metal in the molten metal drawing chamber 64 is pushed out, and the molten metal is supplied to the injection sleeve 22. At this time, the molten metal of the first overflow means 72 functions as a plug that blocks the communication portion between the sealed furnace body 60 and the molten metal pumping chamber 64. Further, in the technique of Patent Document 3, the molten metal pumping chamber 64 is melted by exhausting the gas in the sealed furnace main body 60 and drawing back the molten metal in the molten metal pumping chamber 64 through the second overflow means 74 by back pressure. The hot water supply pipe line 14 communicating with the molten metal pumping chamber 64 and the injection sleeve 22 is drained. As described above, in the technique of Patent Document 2, the molten metal functions as a stopper, and the molten metal pumping chamber 64 is maintained at a constant level by the first overflow means 72.

  The technique of Patent Document 4 is similar to the technique of Patent Document 1 in that the molten metal holding chamber 25, the molten metal supply chamber 29 (molten metering chamber) communicating with the molten metal holding chamber 25 and the injection sleeve 5, the molten metal holding chamber 25, and the molten metal are used. An opening / closing valve 47 for opening and closing the communication passage 27b with the supply chamber 29 is provided. However, the molten metal is transferred from the molten metal holding chamber 25 to the molten metal supply chamber 29 by immersing the immersion body 31 in the molten metal and pushing out the molten metal, and the molten metal is transferred from the molten metal supply chamber 29 to the injection sleeve 5 by an electromagnetic pump. Is done.

In addition, there is a technique disclosed in Patent Document 5 as a technique for controlling the molten metal surface level, and a technique disclosed in Patent Document 6 as a technique for automatically measuring molten metal.
Japanese Utility Model Publication No. 3-4364 Japanese Patent Laid-Open No. 5-269568 JP-A 63-295054 Japanese Patent Laid-Open No. 11-123525 Japanese Patent Laid-Open No. 9-277017 JP-A-48-7843

  In the techniques of Patent Literature 1 and Patent Literature 4, an open / close device that opens and closes the communication portion between the molten metal measuring chamber and the molten metal holding chamber is necessary, and the configuration is complicated. In the technique of Patent Document 2, the surface level of the molten metal measuring chamber decreases as the molten metal level of the molten metal holding chamber decreases, and the molten metal level cannot be kept constant, and accurate measurement of the molten metal is difficult. is there. In the technique of the cited document 3, when the molten metal is transferred from the molten metal holding chamber to the molten metal measuring chamber and the molten metal measuring chamber is maintained at a level defined by the first overflow means, the molten metal is melted by the second overflow means. There is a possibility that the molten metal flows from the measuring chamber to the molten metal holding chamber and the surface of the molten metal measuring chamber is lowered, and the hot water supply piping 14 communicates with the upper side of the molten metal measuring chamber in order to drain the hot water supply piping 14. Therefore, only a part of the molten metal in the upper part of the molten metal accommodated in the molten metal measuring chamber can be sent out, resulting in an increase in the size of the molten metal measuring chamber.

  The objective of this invention is providing the hot_water | molten_metal supply amount control apparatus which can supply a highly accurate fixed_quantity | quantitative_supply of a molten metal with a compact structure.

  A hot water supply amount control device according to the present invention includes a first communication path that communicates with an injection sleeve that communicates with a cavity formed in a mold, a molten metal measurement chamber that communicates with the first communication path, and a molten metal in the molten metal measurement chamber. A first transfer means capable of transferring the molten metal from the molten metal measuring chamber to the injection sleeve through the first communication path until the molten metal level changes from the first level to the second level; and a first communicating means communicating with the molten metal measuring chamber. A second communicating path, a molten metal holding chamber communicating with the second communicating path, and the second level from the molten metal holding chamber to the molten metal measuring chamber so that the molten metal level of the molten metal measuring chamber becomes the first level. A second transfer means capable of transferring the molten metal through the communication path, wherein the first communication path has a first communication port with the injection sleeve above the second communication port with the molten metal measurement chamber. The second communication port is located at the bottom of the side surface of the molten metal measuring chamber The second communication path is formed such that the third communication port with the molten metal measurement chamber is located above the fourth communication port with the molten metal holding chamber, and the third communication port is The height from the fourth communication port to the third communication port is greater than the height from the second communication port to a predetermined position in the injection sleeve. .

  Preferably, the first transfer means is a pneumatic circuit capable of pressurizing the molten metal measurement chamber by supplying gas to the molten metal measurement chamber, and the second transfer means supplies gas to the molten metal holding chamber. A pneumatic circuit capable of supplying and pressurizing the molten metal measuring chamber.

  Preferably, the first transfer means is a pneumatic circuit capable of supplying a gas to the molten metal measurement chamber and pressurizing the molten metal measurement chamber, and the second transfer means is connected to the molten metal in the molten metal holding chamber. An immersion body capable of immersing at least a part of the immersion body, and a drive unit capable of raising and lowering the immersion body in a state where a part of the immersion body is immersed in the molten metal are provided.

  Preferably, the first transfer means is an electromagnetic pump, and the second transfer means is a pneumatic circuit capable of pressurizing the molten metal measurement chamber by supplying gas to the molten metal holding chamber.

  Preferably, the first transfer means is an electromagnetic pump, and the second transfer means includes an immersion body capable of immersing at least a part in the molten metal in the molten metal holding chamber, and a part of the immersion body in the molten metal. A drive unit capable of moving up and down the immersion body in an immersed state.

  According to the present invention, it is possible to perform high-precision quantitative supply of molten metal with a compact configuration.

(First embodiment)
FIG. 1 is a cross-sectional view showing a hot water supply amount control device 1 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the periphery of an injection sleeve 3 to which molten metal is supplied by the hot water supply amount control device 1 (FIG. 2 is a sectional view taken along line II-II in FIG.

  The hot water supply amount control device 1 is configured as a device that supplies a certain amount of molten metal M to the injection sleeve 3 of the die casting machine DC. As shown in FIG. 2, the die casting machine DC includes a mold clamping device (not shown) for performing mold opening / closing and mold clamping of a pair of molds 2 </ b> A and 2 </ b> B (hereinafter simply referred to as “mold 2”). An injection device EJ for injecting and filling the molten metal M into the cavity Cb formed by the mold 2 and an extrusion device (not shown) for extruding the solidified molded product from the cavity Cb are provided.

  The hot water supply amount control device 1 may be regarded as a component of the die casting machine DC or as a device different from the die casting machine DC. Hereinafter, the hot water supply amount control device 1 is assumed to be included in the die casting machine DC, and the mold clamping device and the injection device may be referred to as a machine body.

  The injection device EJ drives the injection sleeve 3 that communicates with the cavity Cb, the injection plunger 7 that moves forward in the injection sleeve 3 toward the mold 2 to inject and fill the molten metal in the injection sleeve 3, and the injection plunger 7. And a position sensor 12 for detecting the position of the injection plunger 7. The injection plunger 7 has a plunger tip 5 that slides within the injection sleeve 3 and a plunger rod 6 that is connected to the plunger tip 5. The hydraulic cylinder 11 has a cylinder rod 8 connected to the plunger rod 6 via a coupling, a piston 9 connected to the cylinder rod 8, and a cylinder chamber 10 in which the piston 9 can slide.

  As shown in FIG. 1, the hot water supply amount control device 1 includes a furnace body 21 for holding and measuring the molten metal M, and a first communication path 22 communicating with the furnace body 21 and the injection sleeve 3. The molten metal M held and measured in the furnace body 21 is supplied to the injection sleeve 3 via the first communication path 22. The first communication path 22 is formed by a hot water supply pipe 23 and a mouthpiece 24.

  The furnace body 21 is movably supported by a wheel 26 that is pivotally supported by the furnace body 21 and a rail 27 that supports the wheel 26, and is driven in a direction toward or away from the injection sleeve 3 by a hydraulic cylinder 28. The The hydraulic cylinder 28 includes a piston rod 28a fixed to the furnace body 21, and a cylinder body 28b fixed to a rail 27 and a floor surface to which the rail 27 is fixed.

  The hot water supply pipe 23 is fixed to the furnace body 21. On the other hand, the mouthpiece 24 is fixed to the injection sleeve 3. The hot water supply pipe 23 and the mouthpiece 24 are brought into contact with or separated from each other by the movement of the furnace body 21 in the direction of approaching or separating from the injection sleeve 3.

  The furnace body 21 includes a main body 31 having a bottom portion and a side portion, and a lid body 32 that covers the main body 31. Inside the furnace body 21, a molten metal measuring chamber 33 that measures the molten metal M supplied to the injection sleeve 3, communicated with the first communicating passage 22, a second communicating passage 34 that communicates with the molten metal measuring chamber 33, and a second A molten metal holding chamber 35 that communicates with the communication path 34 and holds the molten metal M supplied to the molten metal measuring chamber 33 is formed by the main body 31 and the lid body 32.

  The molten metal measuring chamber 33 is formed, for example, in a rectangular cross section, and most of the side surface and the bottom surface are formed by the main body 31 of the furnace body 21, and part of the side surface and the top surface are formed by the lid body 32. . A molten metal discharge port 37 communicating with the hot water supply pipe 23 (first communication passage 22) is provided below the side surface of the molten metal measuring chamber 33, and a first molten metal transfer port 38 communicating with the second communication passage 34 is provided above the side surface. Is provided.

  The molten metal discharge port 37 is provided at the bottom of the side surface of the molten metal measurement chamber 33, and the bottom surface of the molten metal discharge port 37 is continuous with the bottom surface of the molten metal measurement chamber 33 and has the same height. The first molten metal transfer port 38 is formed by a gap between a weir 39 provided in the main body 31 of the furnace body 21 and a drooping portion 40 protruding downward from the lid body 32 of the furnace body 21 at a position facing the weir 39. Has been. The weir 39 divides the molten metal measurement chamber 33 and the second communication passage 34, and constitutes the side surface of the molten metal measurement chamber 33 and the side surface of the second communication passage 34. The drooping portion 40 may be omitted. The first molten metal transfer port 38 is formed to reduce the diameter from the second communication path 34 side to the molten metal measuring chamber 33 side.

  For example, the second communication path 34 is formed so as to extend in the vertical direction, and one side surface is constituted by the weir 39 as described above, and the other side surface facing the weir 39 is a lower side from the lid body 32. It is comprised by the drooping wall 42 which protrudes to. The above-described first molten metal transfer port 38 is provided above the second communication path 34. A second molten metal transfer port 43 that communicates with the molten metal holding chamber 35 is provided below the second communication path 34. The second molten metal transfer port 43 is formed by a gap between the hanging wall 42 and the bottom of the main body 31 of the furnace body 21. The second molten metal transfer port 43 is formed to reduce the diameter from the molten metal holding chamber 35 side to the second communication path 34 side.

  The molten metal holding chamber 35 is formed, for example, in a rectangular cross section, one side is constituted by a hanging wall 42, the other side and bottom are constituted by a main body 31 of the furnace body 21, and the upper surface is constituted by a lid body 32 of the furnace body 21. ing. The second molten metal transfer port 43 described above is provided at the lowermost part of the side surface of the molten metal holding chamber 35, and the bottom surface of the second molten metal transfer port 43 is continuous with the bottom surface of the molten metal holding chamber 35 and has the same height. is there.

  The hot water supply pipe 23 is formed in a substantially cylindrical shape, extends from the end communicating with the molten metal discharge port 37 to the mouthpiece 24 side while inclining upward, and contacts the side surface of the mouthpiece 24. Inside the mouthpiece 24, a communication passage 24 a that connects the hot water supply pipe 23 and the injection sleeve 3 is formed. A communication port of the communication passage 24 a with the hot water supply pipe 23 is open on the side surface of the mouthpiece 24. A communication port of the communication passage 24 a with the injection sleeve 3 is opened on the upper surface of the mouthpiece 24 and coincides with the hot water supply port 3 a provided on the bottom surface of the injection sleeve 3.

  The volume of the molten metal holding chamber 35 is larger than the volume of the molten metal measuring chamber 33 and occupies most of the volume of the furnace body 21. For example, the volume of the molten metal holding chamber 35 is several times to several tens of times the volume of the molten metal measuring chamber 33. The portion of the furnace body 21 that forms the molten metal measurement chamber 33 is outward (left side of the drawing) at the upper side of the side of the portion of the furnace body 21 that forms the second communication passage 34 and the molten metal holding chamber 35. It is formed so as to protrude.

  The heights of the upper surfaces of the molten metal measuring chamber 33, the second communication passage 34, and the molten metal holding chamber 35 are the same. Further, the heights of the bottom surfaces of the second communication passage 34 and the molten metal holding chamber 35 are the same, and the heights of the bottom surfaces of the molten metal measuring chamber 33 are higher than the heights of the bottom surfaces of the second communication passage 34 and the molten metal holding chamber 35. . The height of the molten metal measurement chamber 33 is smaller than the height of the second communication passage 34 and the molten metal holding chamber 35. For example, the height of the molten metal measurement chamber 33 is about half of the height of the second communication passage 34 and the molten metal holding chamber 35. The position of the hot water supply port 3a is slightly higher (a height 1 or more described later) than the position of the bottom surface of the first molten metal transfer port 38 (the upper end of the weir 39).

  The furnace body 21 is provided with a molten metal replenishing portion 45 for replenishing the molten metal M to the molten metal holding chamber 35. The molten metal replenishing section 45 includes a replenishing pipe 46 that communicates the inside of the molten metal holding chamber 35 and the outside of the furnace body 21, and a lid body 47 that opens and closes the replenishing pipe 46. The supply pipe 46 is a cylindrical body that extends while being reduced in diameter, and has a hole that opens in the lid 32 of the furnace body 21 with the diameter-expanded side end facing upward and the diameter-reduced end facing downward. Is fitted and inserted. The lid 47 of the molten metal replenishing portion 45 is provided so as to open and close the end portion on the enlarged diameter side of the replenishing tube 46. The lid 47 does not seal the supply pipe 46, and the pressure of the supply pipe 46 is kept at atmospheric pressure.

  The hot water supply amount control device 1 includes a level detector 51 that detects the level of the molten metal M in the molten metal measuring chamber 33, a hot water level detector 52 that detects the level of the molten metal in the second communication path 34, A pressure adjustment unit 53 for adjusting the pressure of the molten metal holding chamber 35 and a control device 54 for controlling the operation of the pressure adjustment unit 53 based on the detection results of the level detection unit 51 and the molten metal surface detector 52 are provided. .

  For example, the level detection unit 51 penetrates the lid 32 of the furnace body 21, one end is located outside the furnace body 21, and the other end is located in the molten metal measurement chamber 33, and is movable in the vertical direction with respect to the lid 32. A linear scale 57, a linear sensor 58 that detects the position of the linear scale 57, and a float 59 that is provided at the end of the linear scale 57 on the molten metal measuring chamber 33 side and floats on the molten metal M surface. The fluctuation of the molten metal M surface is transmitted to the linear scale 57 via the float 59, and the linear scale 57 moves up and down. The linear sensor 58 outputs a signal corresponding to the relative position with the linear scale 57 to the control device 54. The linear sensor 58 and the linear scale 57 are, for example, electromagnetic type or optical type.

The molten metal detector 52 is configured to include, for example, an electrode bar that hangs down from the lid 32 of the furnace body 21 into the second communication passage 34, and the molten metal M rises and the molten metal M becomes an electrode rod. It is detected from the change in resistance value due to contact that the level of the molten metal M has reached a predetermined level, and a detection signal is output to the control device 54. The hot water level detected by the hot water level detector 52 is a position slightly higher (indicated by height 1 in the figure) from the height of the weir 39 (first hot water level L ₀ ).

  The pressure adjustment unit 53 includes a pressurization conduit 61 and an exhaust conduit 62 that communicate with the molten metal measurement chamber 33, a pressurization conduit 63 and an exhaust conduit 64 that communicate with the melt holding chamber 35, and a pressurization conduit 61 and a pressurization conduit 63. And a gas pressure control unit 65 for controlling supply of gas and exhaust through the exhaust conduit 62 and the exhaust conduit 64. The pressure adjusting unit 53 is an example of a pneumatic circuit of the present invention.

  The pressurization conduit 61, the exhaust conduit 62, the pressurization conduit 63, and the exhaust conduit 64 are configured by, for example, a flexible tube or a metal tube, all of which are lid bodies 32 of the furnace body 21. The molten metal measuring chamber 33 or the molten metal holding chamber 35 is communicated with the molten metal through a hole formed in the inner surface. The gas pressure control unit 65 includes, for example, a valve capable of opening and closing each of the conduits 61 to 64, and a pump and an accumulator capable of supplying pressurized gas to the pressurized conduit 61 and the pressurized conduit 63, although not particularly illustrated. ing.

  For example, the control device 54 is configured by a computer including a CPU, a ROM, a RAM, an external storage device, and the like, although not particularly illustrated. The control device 54 includes a mold information setting unit 71, a hot water supply amount correction information generation unit 72, and a hot water supply amount control unit 73.

  The mold information setting unit 71 acquires and holds mold information related to the mold 2. The mold information is acquired when an operator inputs data to a control panel (not shown) or when the control device 54 reads data via a storage medium or a network. The mold information includes, for example, information related to the amount of hot water supply such as the volume of the cavity Cb and the required biscuit thickness.

  The hot water supply amount correction information generating unit 72 generates hot water supply amount correction information in the next cycle and the like based on various information acquired in the molding cycle of the die casting machine DC. For example, the measured value of the biscuit thickness is specified based on the detection result of the position sensor 12 when the injection filling is completed, and the measured value of the biscuit thickness and the target value of the biscuit thickness held by the mold information setting unit 71 And the correction information is generated so as to decrease the hot water supply amount when the measured value of the biscuit thickness is larger than the target value and to increase the hot water supply amount when the measured value is smaller than the target value.

  The hot water supply amount control unit 73 determines the hot water supply amount based on the mold information from the mold information setting unit 71 and the hot water supply amount correction information from the hot water supply amount correction information generation unit. Further, the hot water supply amount control unit 73 controls the operation of the gas pressure control unit 65 based on the determined hot water supply amount, the detection result of the level detecting means 51, the detection result of the hot water level detector 52, and the like.

  In addition to the above-described components, the hot water supply amount control device 1 includes a heater 75 around the hot water supply pipe 23 and the mouthpiece 24 for preventing a temperature drop (solidification) of the molten metal flowing through the first communication path 22. Yes.

  FIG. 3 is a flowchart for explaining the operation of the hot water supply amount control apparatus 1.

In step S1, information on the mold 2 is acquired by the mold information setting unit 71, the amount of hot water supplied to the molten metal M is calculated, and the molten metal when the supply of the molten metal M is completed based on the calculated amount of hot water supplied. A second hot water level L ₁ (FIG. 1) in the measuring chamber 33 is calculated. Incidentally, in the molten metal metering chamber 33, the volume V ₀ which the first molten metal surface level L ₀ to the second molten metal surface level L ₁ is the hot water supply amount of the molten metal M in 1 shot.

  In step S <b> 2, pressurized gas is supplied from the gas pressure control unit 65 to the molten metal holding chamber 35 via the pressurized conduit 63, and the molten metal holding chamber 35 is pressurized. At this time, the pressurization conduit 61 and the exhaust conduit 64 are closed. Further, the exhaust conduit 62 is opened, and the molten metal measurement chamber 33 is kept at atmospheric pressure. The pressure in the injection sleeve 3 and the first communication path 22 is also maintained at atmospheric pressure.

When the molten metal holding chamber 35 is pressurized by gas pressure downward, molten metal surface of the molten metal M in the molten metal holding chamber 35, as is illustrated by the molten metal surface level L2 and bath level level L3 in FIG. 1, It gradually descends (step S3), and the surface of the molten metal M in the second communication passage 34 rises. Specifically, the molten metal surface of the second communication passage 34 is hot water of the molten metal holding chamber 35 by a height corresponding to the difference between the gas pressure of the molten metal holding chamber 35 and the gas pressure (atmospheric pressure) of the second communication passage 34. It becomes high with respect to the surface.

  Then, when the molten metal level of the molten metal M in the second communication passage 34 rises to a position higher than the weir 39 by a height l, an ON signal indicating detection of the molten metal level is output by the molten metal level detector 52 (step S4). ), The pressurizing conduit 63 is closed, the gas pressure holding timer is turned on (step S5), and a predetermined holding time is counted. The gas pressure holding timer is provided in the control device 54, for example.

  At the time of step S5, the hot water level of the second communication passage 34 is higher than the weir 39, and as long as the pressure difference between the second communication passage 34 and the molten metal holding chamber 35 is kept constant, the second communication passage 34 is maintained. Since the molten metal level is kept constant, the molten metal M in the second communication passage 34 overflows from the second communication passage 34 and flows into the molten metal measurement chamber 33 while the holding time is being measured by the gas pressure holding timer. Further, since the atmospheric pressures of the first communication passage 22 and the molten metal measurement chamber 33 are both atmospheric pressure, the molten metal measurement is performed so that the molten metal level of the first communication passage 22 and the molten metal measurement chamber 33 are the same. The molten metal M flows from the chamber 33 into the first communication passage 22. In addition, since the position of the hot water supply port 3 a is higher than the upper end of the weir 39 by a height l or more, the molten metal M does not flow into the injection sleeve 3.

  During the holding time, the molten metal M in the second communication passage 34 flows into the molten metal measurement chamber 33 and the first communication passage 22, and the hot water level of the molten metal measurement chamber 33 and the first communication passage 22 is the hot water level of the second communication passage 34. Is set to a time sufficient to reach the same level, and is obtained in advance by experiments and calculations and stored in the control device 54.

  The molten metal M in the second communication passage 34 flows into the molten metal measuring chamber 33, so that the molten metal level in the molten metal holding chamber 35 is slightly lowered. The surface level of the molten metal M in the second communication passage 34 is the height corresponding to the difference between the gas pressure in the molten metal holding chamber 35 and the gas pressure in the second communication passage 34. Since the position is higher than the level, the level is lowered in accordance with the decrease in the level of the molten metal M in the molten metal holding chamber 35. However, since the plane area of the molten metal holding chamber 35 is relatively large with respect to the volume of the molten metal measuring chamber 33, the difference l between the molten metal level detected by the molten metal level detector 52 and the weir 39 is set to an appropriate size. In this case, the hot water level of the second communication passage 34 is lower than the weir 39 before the hot water level of the molten metal measuring chamber 33 becomes the same level as the hot water level of the second communication passage 34. Absent. While the gas pressure holding timer is ON, the molten metal holding chamber 35 is slightly pressurized based on the detection result of the hot water level detector 52 so that the hot water level of the second communication passage 34 is maintained constant. Thus, the gas pressure may be appropriately controlled.

  When the gas pressure holding timer is turned off (step S6), the exhaust conduit 64 is opened, and the molten metal holding chamber 35 is exhausted (step S7). Thereby, the pressure difference between the second communication passage 34 and the molten metal holding chamber 35 is reduced, and the molten metal surface of the second communication passage 34 is lowered. Further, the molten metal M in the molten metal measuring chamber 33 overflows from the molten metal measuring chamber 33 through the weir 39 and flows into the second communication portion 34, and the molten metal measuring chamber 33 is lowered in level.

Molten metal surface level of the molten metal metering chamber 33 becomes high and the same height of the weir 39, the level detecting unit 51 when the first molten metal surface level L ₀ is detected (step S8), and pressurized with exhaust conduit 64 is closed The conduit 63 is opened to pressurize the molten metal holding chamber 35 (step S9), and the flow of the molten metal M from the second communication path 34 to the molten metal holding chamber 35 is stopped.

At this time, even if a time delay occurs in the detection of the first molten metal level L ₀ by the level detection unit 51 and the control from the detection until the exhaust conduit 64 is closed, the molten metal M in the molten metal measuring chamber 33 passes through the weir 39. only by overflowing from the molten metal metering chamber 33 Te, since it is possible outflow into the second communication passage 34, molten metal surface level of the molten metal M in the molten metal metering chamber 33 is accurately maintained at the first molten metal surface level L _0.

  In step S9, the molten metal at the time point of step S4 is set so that the molten metal level of the molten metal M in the second communication passage 34 does not exceed the height of the weir 39 by the re-rise of the molten metal level of the molten metal M in the second communication passage 34. By referring to the gas pressure in the holding chamber 35, etc., it is necessary to re-raise only an amount sufficient to stop the lowering of the molten metal surface level of the second communication passage 34 or some percent of the lowering amount from the weir 39. After pressurizing by a sufficient amount, the pressurizing conduit 63 is closed. In step S9, the exhaust conduit 64 may be closed to hold the pressure. After completion of step 9, the exhaust conduit 62 is also closed.

  In FIG. 3, when the mold clamping of the mold 2 is completed and the hot water supply preparation of the machine body is completed (step S10), the hot water supply is started (step S11). That is, the pressurization conduit 61 is opened, pressurized gas is supplied to the molten metal measurement chamber 33, and the molten metal measurement chamber 33 is pressurized (step S12). At this time, the inside of the injection sleeve 3 is equal to the atmospheric pressure or is evacuated and lower than the atmospheric pressure.

When molten metal metering chamber 33 is pressurized, molten metal surface level of the molten metal metering chamber 33 is gradually lowered from the first molten metal surface level L _0. Meanwhile, the hot water level of the first communication passage 22 rises and reaches the hot water supply port 3 a, and the molten metal M flows into the injection sleeve 3. And the hot water level of the injection sleeve 3 rises. Specifically, the hot water level of the first communication passage 22 and the injection sleeve 3 is the height corresponding to the difference between the gas pressure of the molten metal measurement chamber 33 and the gas pressure of the first communication passage 22 and the injection sleeve 3. The molten metal level in the molten metal measuring chamber 33, the first communication passage 22 and the injection sleeve 3 varies so as to be higher than the molten metal level in the molten metal M in the molten metal measuring chamber 33.

When molten metal surface level of the molten metal M in the molten metal metering chamber 33 by the level detection unit 51 it is detected that reaches the second bath level level L ₁ (step S13), and the pressurized pipe 61 is closed, the molten metal metering chamber 33 Is maintained, and the supply of the molten metal M from the molten metal measuring chamber 33 to the injection sleeve 3 is stopped.

  While the molten metal measurement chamber 33 is being pressurized (step S11 to step S13), the molten metal M in the second communication passage 34 serves as a stopper that prevents gas from entering the molten metal holding chamber 35 from the molten metal measurement chamber 33. Function.

  When step S13 is completed and preparation for injection of the machine body is completed, injection is started (step S15). That is, the plunger tip 5 starts moving forward by the hydraulic cylinder 11. When the plunger tip 5 passes through the hot water supply port 3a, in the hot water supply amount control device 1, the exhaust conduit 62 is opened, and the exhaust of the molten metal measurement chamber 33 is started (step S17). The passage of the plunger tip 5 through the hot water supply port 3a is specified based on the detection result of the position sensor 12.

  The back side of the plunger tip 5 of the injection sleeve 3 (including the hot water supply port 3a after step S15) is at atmospheric pressure, so that as the atmospheric pressure in the molten metal measuring chamber 33 approaches atmospheric pressure by exhaust, the first series As the molten metal level in the passage 22 decreases, the molten metal level in the molten metal measuring chamber 33 rises, and the molten metal level in the first communication path 22 and the molten metal measuring chamber 33 become the same. Then, the hot water supply is finished, and a standby state for the next cycle is entered (step S19).

  When the injection is finished in the machine body, the hot water supply amount control device 1 generates hot water supply amount correction information based on the detection result of the position sensor 12 and the like as described above (step S21).

Thereafter, when a predetermined process is completed or started in the machine body, for example, when mold closing in the next cycle is started, the molten metal amount control device 1 starts pressurizing the molten metal holding chamber in the same manner as in step S2. To do. Then, step S4 and subsequent steps are repeated. However, the second molten metal surface level L ₁ is as amended is utilized based on the hot-water supply amount control information generated in step S21.

  FIG. 4 is a diagram for explaining design conditions of the first communication path 22 and the second communication path 34 that cause the molten metal M of the second communication path 34 to function as a stopper, and shows the state of the hot water supply amount control device 1 in a predetermined step. It shows conceptually.

FIG. 4A shows a state in which step S9 has been completed. However, in FIG. 4 (a), the molten metal M of the second communication passage 34 indicates a state that is ideally first molten metal surface level L _0. In this state, since the injection sleeve 3 and the molten metal measuring chamber 33 have the same atmospheric pressure (atmospheric pressure), the molten metal surface levels are also equivalent to each other. In addition, the distance from the molten metal surface of the molten metal holding chamber 35 to the molten metal surface (first molten metal surface level L ₀ ) of the second communication passage 34 is y ₃₅ , the atmospheric pressure of the molten metal holding chamber 35 is P ₃₅ , and the density of the molten metal M is ρ. When the gravitational acceleration is g, the following equation is established from the relationship between the atmospheric pressure and the molten metal surface between the second communication passage 34 and the molten metal holding chamber 35.
P ₃₅ = P ₀ + ρ gy ₃₅ (1)

FIG. 4B shows a state in which step S13 has been completed. In this state, the pressure of the injection sleeve 3 is P ₃ , the pressure of the molten metal measurement chamber 33 (second communication path 34) is P ₃₃ , and the distance from the molten metal measurement chamber 33 to the hot water surface of the injection sleeve 3 is y _33. The distance from the first molten metal level L ₀ of the molten metal surface of the second communication passage 34 is y ₃₄ , the distance of the molten metal surface of the molten metal holding chamber 35 from the first molten metal level L ₀ is y ′ ₃₅ , and the molten metal holding chamber. When the atmospheric pressure of ₃₅ is P ′ ₃₅ , the relationship between the atmospheric pressure and the molten metal surface between the first communication path 22 and the injection sleeve 3 and the molten metal measuring chamber 33,
P ₃₃ = P ₃ + ρgy ₃₃ (2)
From the relationship between the atmospheric pressure and the molten metal surface between the second communication passage 34 and the molten metal holding chamber 35,
P ₃₃ = P ′ ₃₅ + ρg (y ₃₄ −y ′ ₃₅ ) (3)
Is established.

In steps S11 to S13, in order for the second communication passage 34 to function as a stopper, the top surface of the second molten metal transfer port 43 (the lower end of the drooping wall 42) to the bottom surface of the first molten metal transfer port 38 (the upper end of the weir 39). The height H of the second communication path 34 must be larger than the lowering amount y _{34 of} the second communication passage 34. This is expressed as follows.

H> y ₃₄
From equation (3)
_{= (P 33 -P '35 +} ρgy' 35) / ρg
From equation (2)
= (P ₃ + ρgy ₃₃ −P ′ ₃₅ + ρgy ′ ₃₅ ) / ρg

Here, since the atmospheric pressure P ₃ is equal to or lower than the atmospheric pressure P ₀ , P ₃ = P ₀ and the area of the horizontal section of the molten metal holding chamber 35 is relatively larger than the area of the horizontal section of the second communication passage 34. Since the fluctuation of the molten metal level and the atmospheric pressure in the molten metal holding chamber 35 between FIG. 4A and FIG. 4B is relatively small, P ′ ₃₅ = P ₃₅ and y ′ ₃₅ = y ₃₅ Considering equation (1),
H> y ₃₃
It becomes.

Then, y ₃₃ is y ₃₃ <h, where h is the height from the bottom surface of the molten metal discharge port 37 to the molten metal surface of the molten metal M of the injection sleeve 3. The molten metal M in the communication passage 44 functions as a stopper. In other words, the height H from the second molten metal transfer port 43 of the second communication passage 34 to the first molten metal transfer port 38 is from the molten metal discharge port 37 of the first communication passage 22 to a predetermined position in the injection sleeve 3. What is necessary is just to be larger than the height h. The predetermined position in the injection sleeve 3 is determined by the required supply amount of the molten metal M into the injection sleeve 3, the diameter of the injection sleeve, the standby position of the plunger tip 5 in the injection sleeve 3, and the like.

According to the above embodiment, in the molten metal amount control device 1 provided with the first communication path 22, the molten metal measuring chamber 33, the second communication path 34, and the molten metal holding chamber 35, the first communication path 22 is connected to the injection sleeve 3. The communicating hot water supply port 3 a is positioned above the molten metal discharge port 37 communicating with the molten metal measurement chamber 33, and the molten metal discharge port 37 is formed at the lowermost side surface of the molten metal measurement chamber 33. The first molten metal transfer port 39 communicating with the molten metal measurement chamber is located above the second molten metal transfer port 43 communicating with the molten metal holding chamber 35, and the first molten metal transfer port 39 has the first molten metal level L ₀ . Since the height H of the second communication passage 34 is set to be larger than the height h of the hot water supply system on the first communication passage 22 and the injection sleeve 3 side, the molten metal metering is performed. exactly match the melt-surface level of the chamber 33 to the first molten metal surface level L ₀ Enables metering precise melt M by the molten metal M of the second communication passage 44 can be simplified configuration to function as a plug, and, near the bottom of the second molten metal surface level L ₁ of the molten metal metering chamber 33 The molten metal measuring chamber 33 can be made compact so that it can be set.

  Further, both of the transfer of the molten metal M from the molten metal holding chamber 35 to the molten metal measuring chamber 33 via the second communication path 34 and the transfer of the molten metal M from the molten metal measuring chamber 33 to the injection sleeve 3 via the first communication path 22. Therefore, at least a part of the gas pressure adjusting unit 65 (for example, a pump or an accumulator) is shared by the transfer system on the first communication path 22 side and the transfer system on the second communication path 34 side. This simplifies the configuration and reduces the size.

(Second Embodiment)
FIG. 5 is a cross-sectional view illustrating a configuration of a hot water supply amount control apparatus 101 according to the second embodiment. In addition, about the structure similar to the hot water supply amount control apparatus 1 of 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  The second embodiment is different from the first embodiment in that the molten metal M is transferred from the molten metal holding chamber 35 to the molten metal measuring chamber 33 by the molten metal surface holding mechanism 102. Further, the furnace body 121 is different from the first embodiment in that an air opening hole (not shown) is provided in the lid body 132 and the atmospheric pressure of the molten metal holding chamber 35 is maintained at the atmospheric pressure.

  The molten metal surface holding mechanism 102 can drive the immersion body 103 in the vertical direction with the immersion body 103 capable of immersing at least a part of the molten metal M in the molten metal holding chamber 35 and the immersion body 103 immersed in the molten metal. And an elevating drive unit 104.

  The elevating drive unit 104 is, for example, a screw shaft 105 that is fixed to the immersion body 103 and passes through the lid 32 so as not to rotate, a gear (not shown) that fits the screw shaft 105, and the gear. And a screw shaft drive unit 106 including a motor (not shown).

  The screw shaft drive unit 106 drives the motor according to a control command from the hot water supply amount control unit 73 to rotate the gear. The screw shaft 105 moves up and down as the gear rotates, whereby the volume of the immersion body 103 immersed in the molten metal M changes. Then, along with the change in the volume in which the immersion body 103 is immersed, the molten metal surface of the molten metal holding chamber 35 is raised and lowered, and the molten metal surface of the second communication path 34 is also raised and lowered.

  FIG. 6 is a flowchart for explaining a part of the operation of the hot water supply amount control apparatus 101.

  The outline of the operation of the hot water supply amount control apparatus 101 is the same as the operation of the hot water supply amount control apparatus 1 of the first embodiment shown in FIG. However, in the hot water supply amount control apparatus 101, instead of steps S2 to S9 in FIG. 3, operations in steps S101 to 107 in FIG. 6 are performed.

  In step S101, the descent body 102 starts to descend, and the molten metal surface of the molten metal holding chamber 35 rises. At this time, the pressurizing conduit 61 is closed, the exhaust conduit 62 is opened, and the atmospheric pressure in the second communication path 34 is atmospheric pressure. Further, as described above, the pressure in the molten metal holding chamber 35 is also atmospheric pressure. Therefore, the hot water level of the second communication passage 34 and the molten metal holding chamber 35 are the same, and the hot water level of the second communication passage 34 rises as the hot water level of the molten metal holding chamber 35 rises.

  Similarly to step S4 of FIG. 3, when the ON level signal indicating the detection of the molten metal level is output by the molten metal level detector 52 (step S102), the descent body 102 stops descending and the immersion body position holding timer is turned on. (Step S103), a predetermined holding time is measured. The immersion body position holding timer is provided in the control device 54, for example.

  And while the position of the immersion body 102 is hold | maintained, similarly to the case where the gas pressure was hold | maintained in step S4 of FIG. 3, a molten metal flows into the molten metal measurement chamber 33 from the 2nd communicating path 34, and eventually, a molten metal flows. The hot water level of the measuring chamber 33 is the same as the hot water level of the second communication passage 34 and the molten metal holding chamber 35. The air pressure in the injection sleeve 3 and the first communication passage 22 is also atmospheric pressure, and the hot water level in the first communication passage 22 is the same as the hot water level in the second communication passage 34 and the molten metal holding chamber 35.

  When the immersion body position holding timer is turned off (step S104), the immersion body 102 starts to rise (step S105). Thereby, the hot water level of the 1st communicating path 22, the molten metal measurement chamber 33, the 2nd communication part 34, and the molten metal holding chamber 35 falls. At this time, the first communication passage 22 and the molten metal measuring chamber 33 are overflowed from the weir 39 and flow into the second communication passage 34.

Similar to the step S8 in FIG. 3, molten metal surface level of the molten metal metering chamber 33 becomes high and the same height of the weir 39, when the first molten metal surface level L ₀ is detected by the level detecting unit 51 (step S106), The rise of the immersion body 102 is stopped (step S107), and the flow of the molten metal M from the second communication path 34 to the molten metal holding chamber 35 is stopped. At this time, similarly to the first embodiment, the molten metal M in the molten metal measuring chamber 33 can flow out to the second communication passage 34 only by overflowing from the molten metal measuring chamber 33 through the weir 39. molten metal surface level of the molten metal M of 33 is accurately maintained at the first molten metal surface level L _0.

  When the hot water supply preparation of the machine body is completed (see step S10 in FIG. 3), hot water supply is started in the same manner as in step S11 in FIG. 3 (step S108). The subsequent steps are the same as those after step S13 in FIG. However, in step S22 of FIG. 3, the immersion body is lowered.

  Also in the second embodiment, the design conditions of the first communication path 22 and the second communication path 34 that cause the molten metal M of the second communication path 34 to function as a plug are the same as those in the first embodiment. Specifically, it is as follows.

First, when step S13 of FIG. 3 is completed, the expression (2) is similarly established in the second embodiment. In addition, since the pressure in the molten metal holding chamber 35 is maintained at the atmospheric pressure P ₀ and the molten metal level in the molten metal holding chamber 35 is generally maintained at the first molten metal level L ₀ , the molten metal measuring chamber 33 has a molten metal level of the first level. At the time when the hot water level L ₁ is reached, the following formula is established instead of the formula (3).
P ₃₃ = P ₀ + ρ gy ₃₄ (4)

Therefore,
H> y ₃₄
From equation (4)
= (P ₃₃ -P ₀ ) / ρg
From equation (2)
= (P ₃ + ρgy ₃₃ −P ₀ ) / ρg
Here, since the atmospheric pressure P ₃ is equal to or lower than the atmospheric pressure P ₀ , if P ₃ = P ₀ ,
H> y ₃₃
It becomes.

Then, y ₃₃ is y ₃₃ <h, where h is the height from the bottom surface of the molten metal discharge port 37 to the molten metal surface of the molten metal M of the injection sleeve 3. The molten metal M in the communication passage 44 functions as a stopper.

  According to the above embodiment, the same effect as the first embodiment can be obtained. Furthermore, since the molten metal is supplied to the molten metal measuring chamber 33 by immersing the immersion body 102, the responsiveness is better than when the pressurized gas is supplied and transferred, and the pressurized gas The fluctuation of the molten metal surface due to the thermal expansion of can be suppressed.

(Third embodiment)
FIG. 7 is a cross-sectional view illustrating a configuration of a hot water supply amount control apparatus 201 according to the third embodiment. In addition, about the structure similar to the hot water supply amount control apparatus 1 of 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

The third embodiment is different from the first embodiment in that the molten metal M is transferred from the molten metal measuring chamber 33 to the injection sleeve 3 by the electromagnetic pump 202. Further, the furnace body 221 is different from the first embodiment in that the lid body 232 is provided with an air opening hole (not shown) and the like, and the pressure of the molten metal measurement chamber 33 is maintained at the atmospheric pressure.

  The electromagnetic pump 202 is provided around the hot water supply pipe 23 and operates based on a control command from the hot water supply amount control unit 73. The electromagnetic pump 202 may be of various types such as an induction type, a conductive type, an alternating current, and a direct current.

The outline of the operation of the hot water supply amount control apparatus 201 is the same as the operation of the hot water supply amount control apparatus 1 of the first embodiment shown in FIG. However, in step S12 of FIG. 3, instead of pressurization of the molten metal measurement chamber 33, the electromagnetic pump 202 transfers the molten metal M from the molten metal measurement chamber 33 to the injection sleeve 3, and in step S13, the second molten metal surface level. When L ₁ is detected, operation of the electromagnetic pump 202 is stopped. Note that the backflow of the molten metal M from the injection sleeve 3 to the second communication path 22 after the electromagnetic pump 202 is stopped is prevented, for example, by closing the hot water supply port 3a with a valve. In step S17 in FIG. The hot water outlet 3a is opened.

  According to the above embodiment, the same effect as the first embodiment can be obtained. Further, since the molten metal is supplied from the molten metal measuring chamber 33 to the injection sleeve 3 by the electromagnetic pump 202, the responsiveness is better than when the pressurized gas is supplied and transferred, and the pressurized gas The fluctuation of the molten metal surface due to the thermal expansion of can be suppressed.

(Fourth embodiment)
FIG. 8 is a cross-sectional view illustrating a configuration of a hot water supply amount control device 301 according to the fourth embodiment. In addition, about the structure similar to the hot water supply amount control apparatus of the 1st-3rd embodiment, the same code | symbol as the 1st-3rd embodiment is attached | subjected and description is abbreviate | omitted.

In the fourth embodiment, the molten metal M is transferred from the molten metal holding chamber 35 to the molten metal measuring chamber 33 by the molten metal surface holding mechanism 102 as in the second embodiment. The point which performs the transfer of the molten metal M to 3 with the electromagnetic pump 202 similarly to 3rd Embodiment differs from 1st Embodiment. Further, the furnace body 321 is different from the first embodiment in that a lid 332 is provided with an air opening hole (not shown) and the like, and the pressure of the molten metal measuring chamber 33 and the molten metal holding chamber 35 is maintained at atmospheric pressure. To do.

The outline of the operation of the hot water supply amount control apparatus 201 is the same as the operation of the hot water supply amount control apparatus 1 of the first embodiment shown in FIG. However, as in the second embodiment, steps S102 to S108 in FIG. 6 are performed instead of steps S2 to S9 in FIG. Similarly to the third embodiment, in step S12 of FIG. 3, instead of pressurizing the molten metal measuring chamber 33, the electromagnetic pump 202 transfers the molten metal M from the molten metal measuring chamber 33 to the injection sleeve 3. When the second molten metal surface level _{L 1} is detected in step S13, the operation of the electromagnetic pump 202 is stopped.

  According to the above embodiment, the same effect as the first embodiment can be obtained. Furthermore, since the molten metal M is transferred by the immersion body 103 or the electromagnetic pump 202, the responsiveness is better than when the pressurized gas is supplied and transferred, and the hot water due to the thermal expansion of the pressurized gas. Surface fluctuations can also be suppressed.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The molding machine to which hot water is supplied by the hot water supply amount control device of the present invention is not limited to the one with the horizontal mold clamping horizontal injection system. A vertical clamping method or a vertical injection method may be used.

  The detection of the molten metal level is only required to detect the molten metal level in the molten metal measuring chamber, and the molten metal level detector of the second communication path is not an essential requirement. That is, the level detector of the molten metal measuring chamber may detect that the molten metal is filled in the molten metal measuring chamber more than the height of the communication port with the second communication passage (more than the height of the weir 39). Moreover, the detection of the hot water surface level is not limited to one using a float or one using an electrode rod, and a sensor having an appropriate configuration may be used. For example, a laser distance sensor or an ultrasonic distance sensor may be used.

Sectional drawing of the hot water supply amount control apparatus of the 1st Embodiment of this invention. Sectional drawing which shows the injection apparatus with which molten metal is supplied by the hot water supply amount control apparatus of FIG. The flowchart explaining operation | movement of the hot water supply amount control apparatus of FIG. The conceptual diagram explaining the design conditions of the hot water supply amount control apparatus of FIG. Sectional drawing of the hot water supply amount control apparatus of the 2nd Embodiment of this invention. The flowchart explaining a part of operation | movement of the hot water supply amount control apparatus of FIG. Sectional drawing of the hot water supply amount control apparatus of the 3rd Embodiment of this invention. Sectional drawing of the hot water supply amount control apparatus of the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water supply amount control apparatus, 2 ... Mold, 3 ... Injection sleeve, 22 ... 1st communicating path, 33 ... Molten metal measuring chamber, 34 ... 2nd communicating path, 35 ... Molten metal holding chamber, 53 ... Pressure adjusting part (1st 1 transfer means, 2nd transfer means), Cb ... cavity.

Claims (5)

A first communication path that communicates with an injection sleeve that communicates with a cavity formed in the mold;
A molten metal measuring chamber communicating with the first communication path;
A first transfer means capable of transferring the molten metal through the first communication passage Previous Symbol melt metering chamber or al the injection sleeve,
A level detection unit for detecting the level of the molten metal measuring chamber;
A second communication passage communicating with the molten metal measuring chamber;
A molten metal holding chamber communicating with the second communication path;
A second transfer means capable of transferring the molten metal from the pre-Symbol melt storage chamber via the second communication path to the melt metering chamber,
A control device for controlling the first transfer means and the second transfer means;
With
In the first communication path, the first communication port with the injection sleeve is positioned above the second communication port with the molten metal measurement chamber, and the second communication port is positioned at the lowermost side surface of the molten metal measurement chamber. Formed to
The second communication passage is formed such that the third communication port and said molten metal metering chamber is located in the fourth upper side of the communication port of said molten metal holding chamber,
The height from the upper surface of the fourth communication port to the bottom surface of the third communication port is much larger than the height from the bottom surface of the second communication port to a predetermined position within said injection sleeve,
The control means includes
The molten metal is supplied to the molten metal measurement chamber by raising the molten metal surface of the second communication passage from the bottom surface of the third communication port and overflowing the molten metal from the second communication passage to the molten metal measurement chamber, The level of the molten metal in the molten metal measuring chamber is lowered by lowering the level of the molten metal in the second communicating path below the bottom surface of the third communicating port and overflowing the molten metal from the molten metal measuring chamber to the second communicating path. Controlling the second transfer means so that the first level is the same height as the bottom of the communication port;
Thereafter, the molten metal is transferred from the molten metal measuring chamber to the injection sleeve, and the level detecting unit has set the molten metal measuring chamber level to a predetermined second level below the first level. A hot water supply amount control device for controlling the first transfer means so as to stop the transfer when detected . The first transfer means is a pneumatic circuit capable of pressurizing the molten metal measuring chamber by supplying gas to the molten metal measuring chamber,
The hot water supply amount control device according to claim 1, wherein the second transfer unit is an air pressure circuit capable of supplying a gas to the molten metal holding chamber and pressurizing the molten metal measuring chamber. The first transfer means is a pneumatic circuit capable of pressurizing the molten metal measuring chamber by supplying gas to the molten metal measuring chamber,
The second transfer means includes an immersion body capable of immersing at least a part of the molten metal in the molten metal holding chamber, and a drive unit capable of moving the immersion body up and down while immersing a part of the immersion body in the molten metal. The hot water supply amount control device according to claim 1. The first transfer means is an electromagnetic pump;
The hot water supply amount control device according to claim 1, wherein the second transfer unit is an air pressure circuit capable of supplying a gas to the molten metal holding chamber and pressurizing the molten metal measuring chamber. The first transfer means is an electromagnetic pump;
The second transfer means includes an immersion body capable of immersing at least a part of the molten metal in the molten metal holding chamber, and a drive unit capable of moving the immersion body up and down while immersing a part of the immersion body in the molten metal. The hot water supply amount control device according to claim 1.

Images