JP2014223637A - Pellet supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pellet supply device which can supply pellets to a sprue without using a mechanism for moving a discharge unit.SOLUTION: A pellet supply device 18 includes a pellet transfer pipe 41 for transferring pellets by air, and a discharge unit 42. The discharge unit 42 is supported by a clamp part 47 at a position higher than an injection sleeve 26 to a fixing side member 11a. The discharge unit 42 includes an inflow chamber 55 in which the pellets and air are supplied, and a pellet outlet part 77 opened on a bottom part of the inflow chamber 55. A pellet guide pipe 75 is connected to the pellet outlet part 77. A pellet discharge port 75b on a lower end of the pellet guide pipe 75 is arranged in a fixed position above a sprue 26a. An air supply pipe 70 of a system different from the pellet transfer pipe 41 is connected to the inflow chamber 55. The pellet guide pipe 75 is cooled by flowing the air supplied to the inflow chamber 55 from the air supply pipe 70 to the pellet guide pipe 75.

Description

  The present invention relates to a pellet supply apparatus for supplying pellets such as a lubricant to a pouring port of an injection sleeve of a die casting machine.

  A cold chamber type die casting machine, which is an example of a die casting machine, supplies a molten metal pumped up by a ladle to an injection sleeve (also called a shot sleeve), and then uses the molten metal in the injection sleeve to the tip of a plunger. (Also called a shot piston or a plunger tip) is injected into a cavity in the mold at a high pressure.

  In such a die casting machine, a lubricant is supplied into the injection sleeve at an appropriate timing in order to lubricate the sliding portion between the inner surface of the injection sleeve and the plunger. In the case of an oil-based lubricant (liquid lubricant), the lubricant is supplied into the injection sleeve from the pouring port of the injection sleeve via a supply pump and a piping system. However, oil-based lubricants easily contaminate the periphery of a die casting machine and are not preferable in the working environment, and recently, the use of pellet-like solid lubricants has been recommended.

  In order to supply the solid lubricant pellets into the injection sleeve in a certain amount, a pellet supply device for transferring the measured pellets to the pouring port of the injection sleeve is indispensable. For example, as disclosed in Patent Document 1 and Patent Document 2 below, an apparatus for transferring a weighed pellet to a pouring port of an injection sleeve by air has been proposed.

JP 2002-240041 A JP 2012-110924 A

  As in Patent Document 1, the supply device that sends the measured pellets to the supply target portion (the injection port of the injection sleeve) by compressed air, when the pellets are ejected together with the air from the tip opening of the supply pipe, etc. Therefore, there is a problem that a part of the pellets is scattered around without being entered into the supplied part. The pellet supply apparatus of Patent Document 2 is provided with a cover member made of a metal mesh or punching metal in the pellet discharge portion, so that a part of the pellet can be prevented from being scattered near the pouring port of the injection sleeve due to the force of air. . However, since it is necessary to move the pellet discharge unit with a drive mechanism such as an air cylinder, the structure is complicated, and a logic circuit and specific software for operating the drive mechanism in a predetermined sequence are required. There was room for.

  Accordingly, an object of the present invention is to provide a pellet supply apparatus that can reliably supply lubricant pellets to the pouring port of the injection sleeve and can prevent the pellets from being welded to the inner surface of the pellet guide tube that guides the dropping of the pellets. There is.

  One embodiment of the present invention is a pellet supply apparatus for supplying pellets to a pouring port of an injection sleeve, the pellet transfer pipe through which the pellets and pellet transfer air flow, a discharge unit, guide means, cooling Means. The discharge unit is supported by a member on the fixed side of the die casting machine at a position higher than the pouring port, and has an inflow chamber to which the pellets and air are supplied by the pellet transfer pipe, and the inflow chamber Among the pellets and air supplied to the air, a ventilation member is provided which allows air to flow and prevents passage of the pellets. The guide means has a heat-resistant pellet guide tube. The pellet guide tube is disposed between the pellet outlet formed at the bottom of the discharge unit and the pouring port. And the pellet discharge port of the lower end of this pellet guide pipe opens to the fixed position above the said pouring port, and this pellet guide tube guides that the pellet in the said inflow chamber falls toward the said pouring port. The cooling means cools the pellet guide pipe by flowing air into the pellet guide pipe by an air supply pipe different from the pellet transfer pipe.

  In this embodiment, the pellet guide tube may be formed of a metal tube that can be bent and bent into a shape that avoids a ladle for supplying the molten metal to the pouring port. Moreover, you may provide the clamp part for fixing the said discharge unit to the member by the side of the fixed die plate of the said die-cast molding machine. The cooling means includes a check valve that prevents pellets in the inflow chamber from moving toward the air supply pipe, and a control valve that controls a speed of air supplied from the air supply pipe to the inflow chamber. May be.

  According to the present invention, air can escape from the air and pellets supplied to the inflow chamber of the discharge unit, and the pellets in the inflow chamber can be guided to the pouring port of the injection sleeve by the pellet guide tube. For this reason, it is possible to avoid problems such as pellets scattered around the pouring gate, and a drive mechanism for moving the discharge unit is unnecessary. In addition, since the pellet guide tube can be cooled by flowing air through the pellet guide tube, it is possible to prevent the pellet from adhering to the pellet guide tube due to the influence of heat, and in the unlikely event that the pellet is on the inner surface of the pellet guide tube. Even if it is welded, clogging of the pellet guide tube can be prevented such that the pellet can be discharged by air.

The side view which shows typically the die-casting machine provided with the pellet supply apparatus which concerns on one embodiment in a partial cross section. The perspective view which shows a part of die-casting machine shown by FIG. 1, and the discharge unit of a pellet supply apparatus. The side view of the discharge unit shown by FIG. The front view of the discharge unit shown by FIG. The side view which expanded a part of discharge unit shown by FIG. FIG. 6 is a partial cross-sectional view of the discharge unit shown in FIG. 5. Sectional drawing of the discharge unit which follows the F7-F7 line | wire in FIG. The perspective view of the ventilation member of the discharge unit shown by FIG.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS.
FIG. 1 schematically shows a cold chamber type die casting machine 10 which is an example of a die casting machine. The die casting machine 10 includes a fixed die plate 11, a movable die plate 12, tie bars 13 and 14 (two of four are shown) extending in parallel to each other, a die plate driving mechanism 15, and a molten metal supply device 16. And a release agent supply system 17, a pellet supply device 18, a control unit 19 functioning as a control means, and the like.

  A fixed mold 20 is attached to the fixed die plate 11. A moving die 21 is attached to the moving die plate 12. The die plate driving mechanism 15 has a function of moving the movable die plate 12 along the tie bars 13 and 14 in the horizontal direction. When the molds 20 and 21 are closed, a cavity 22 for a die-cast product (molded product) is formed between the inner surfaces 20a and 21a of the molds 20 and 21. The cavity 22 communicates with a gate 23 as a molten metal passage.

  The molten metal supply device 16 includes an injection sleeve 26, a plunger 27, and a drive unit 28 that moves the plunger 27 in the direction of the axis X1. An example of the drive unit 28 is a hydraulic cylinder driven by a hydraulic circuit 28a. The injection sleeve 26 communicates with the cavity 22 through the gate 23.

  A plunger tip 27 a is provided at the tip of the plunger 27. The plunger tip 27 a is inserted into the injection sleeve 26. A ladle 29 that functions as a molten metal supply means is disposed in the vicinity of the pouring port 26 a of the injection sleeve 26. In a state where the molds 20 and 21 are closed and the plunger tip 27a is retracted, molten metal is supplied into the injection sleeve 26 from the pouring port 26a, and when the plunger tip 27a moves forward, molten metal is supplied to the cavity 22 and die-cast. The product is molded.

  FIG. 2 shows a part of the die casting machine 10 and a part of the pellet supply device 18. The pellet supply device 18 will be described in detail later. FIG. 2 shows a state in which the molten metal accommodated in the ladle 29 is poured into the pouring port 26 a of the injection sleeve 26. At this time, the plunger tip 27a is retracted to a position where the pouring port 26a is opened. The ladle 29 is attached to the support member 30 and is movable in the direction indicated by the arrow X2 with respect to the pouring port 26a. The ladle 29 moves forward to the position shown in FIG. 2 when pouring the molten metal into the pouring port 26a, and rotates around the shaft 30a so as to pour the molten metal in the ladle 29 into the pouring port 26a. It is configured.

  The die casting machine 10 is controlled by a control unit 19 that functions as control means. An example of the control unit 19 has a function of controlling the die plate drive mechanism 15, the molten metal supply device 16, the release agent supply system 17, the pellet supply device 18, and the like. The control unit 19 incorporates a computer program and a memory for controlling a mold opening / closing operation, a molding operation, a release agent spraying operation, a pellet supply operation, and the like described below.

  The release agent supply system 17 includes the robot 31 shown in FIG. 1, a nozzle unit 32 attached to the arm 31 a of the robot 31, a release agent supply mechanism 33 that supplies the release agent to the nozzle unit 32, and the like. Yes. A release agent supply source 34 and a compressed air supply source 35 are connected to the release agent supply mechanism 33. The release agent supply mechanism 33 has a function of pressure-feeding the release agent and air to the nozzle unit 32 based on a command from the control unit 19. An arrow A in FIG. 1 indicates the direction in which the release agent flows. The nozzle unit 32 sprays a release agent toward the molds 20 and 21.

Next, the pellet supply device 18 will be described.
The pellet supply device 18 includes a pellet weighing unit 40, a pellet transfer pipe 41, a discharge unit 42, and a sequencer that is a control unit that controls the operation of the pellet weighing unit 40 shown in FIG. The sequencer may be incorporated in the control unit 19 of the die casting machine 10.

  The pellet supply device 18 has a function of supplying pellets having a lubricant component to the pouring port 26a of the injection sleeve 26 by air. An example of the pellet is a solid lubricant containing wax and graphite. By supplying the solid lubricant into the injection sleeve 26 from the pouring port 26a, the sliding portion between the injection sleeve 26 and the plunger tip 27a is lubricated and the plunger tip 27a is lubricated. I try to prevent galling. As the particle size of the pellet increases, the time required for the pellet to melt in the injection sleeve 26 increases. For this reason, the particle size of the release agent is recommended to be 1 mm or less in consideration of ease of melting. However, other particle sizes may be used.

  The pellet weighing unit 40 has a weighing mechanism 46 for weighing the pellets stored in the hopper 45, and a discharge unit 42 via the pellet transfer pipe 41 by the air supplied from the compressed air supply source 35 to the measured pellets. It has a function to pump. One end 41 a of the pellet transfer pipe 41 is connected to the weighing mechanism 46. The other end 41 b of the pellet transfer pipe 41 is connected to the discharge unit 42. An arrow B in FIG. 1 indicates a direction in which the pellet P (shown in FIG. 5) flows in the pellet transfer pipe 41.

  FIG. 2 shows the discharge unit 42. 3 and 4 show a part of the die casting machine 10 and the discharge unit 42. As shown in FIGS. 3 and 4, the discharge unit 42 is supported by a clamp portion 47 on the frame member 11 a on the fixed die plate 11 side, for example. The discharge unit 42 is attached at a position higher than the pouring port 26 a of the injection sleeve 26.

  The clamp part 47 includes a bracket 48 and a clamp member 49 provided on the bracket 48, and the pellet transfer pipe 41 is held by the clamp member 49. The bracket 48 is attached to the side surface of the frame member 11a which is a part of the die casting machine 10 by bolts 49a. An example of the bracket 48 is capable of adjusting the vertical position with respect to the frame member 11a.

  FIG. 5 is an enlarged side view showing the discharge unit 42. The discharge unit 42 includes a body 50. The body 50 is a cast product called “Tee” of a T shape used as a pipe joint, and integrally has joint ports 51, 52, and 53 that branch in three directions. An inflow chamber 55 formed of a cavity is formed inside the body 50.

  FIG. 6 shows a cross section in the direction along the axis Z of the body 50. FIG. 7 shows a cross section in a direction perpendicular to the axis Z. In FIG. 6, the first joint port 51 is formed on the side portion of the body 50. The second joint port 52 is formed in the upper part of the body 50. The third joint port 53 is formed at the bottom of the body 50.

  A first connection hole 61 is formed in the first joint port 51. A second connection hole 62 is formed in the second joint port 52. A third connection hole 63 is formed in the third joint port 53. These connection holes 61, 62, 63 are all in communication with the inflow chamber 55. Female threads 61a, 62a, and 63a are formed on the inner surfaces of the connection holes 61, 62, and 63, respectively. As shown in FIG. 6, the first connection hole 61 extends in a direction substantially perpendicular to the axis Z of the body 50. The second connection hole 62 and the third connection hole 63 are opposed to each other with respect to the axis Z direction of the body 50.

  As shown in FIG. 5, a pellet transfer pipe 41 is connected to the first joint port 51 by a joint member 65. The flow path inside the pellet transfer pipe 41 communicates with the inflow chamber 55. An air supply pipe 70 for in-line air purge and an air control unit 71 are connected to the second joint port 52 by a joint member 66. The flow path inside the air supply pipe 70 communicates with the inflow chamber 55 via the air control unit 71. The air supply pipe 70 forms a separate air supply system from the pellet transfer pipe 41. An arrow C in FIG. 1 indicates the direction in which air for in-line air purge flows in the air supply pipe 70.

  The air control unit 71 includes a check valve 72 and a control valve 73 that controls the speed of air. The check valve 72 allows air to flow from the air supply pipe 70 toward the inflow chamber 55, but prevents air and pellets in the inflow chamber 55 from moving toward the air supply pipe 70. The control valve 73 controls the speed of air supplied from the air supply pipe 70 to the inflow chamber 55. The speed of air passing through the control valve 73 can be adjusted by operating the operation unit 73a.

  A pellet guide tube 75 is connected to the third joint port 53 by a joint member 67. The flow path inside the pellet guide tube 75 communicates with the inflow chamber 55. One end 75 a of the pellet guide tube 75 is connected to the connection hole 63 of the third joint port 53 of the body 50 through the joint member 67. The upper end of the third connection hole 63 is opened as a funnel-shaped pellet outlet 77 for dropping the pellet supplied to the inflow chamber 55. The pellet outlet 77 is formed at the bottom of the discharge unit 42.

  The other end (lower end) of the pellet guide tube 75 forms a pellet discharge port 75b. The pellet discharge port 75b is opened right above the pouring port 26a of the injection sleeve 26. The pellet guide tube 75 is disposed between the pellet outlet 77 formed at the bottom of the discharge unit 50 and the pouring port 26a, and the pellet discharge port 75b opens at a fixed position above the pouring port 26a. . The vertical position of the pellet discharge port 75b with respect to the pouring port 26a can be finely adjusted by changing the mounting position of the bracket 48 of the clamp portion 47 (shown in FIGS. 3 and 4).

  The pellet guide tube 75 has an appropriate rigidity that can be bent by hand (can be bent) as necessary, such as a copper tube having an outer diameter of 10 mm and a thickness of about 0.8 mm, or a bellows tube that can be formed. It consists of a metal tube having Moreover, the pellet guide tube 75 has heat resistance that can withstand a high temperature of at least 100 ° C. (preferably 200 ° C. or more) so that it does not melt or deteriorate at about the melting temperature of the pellet.

  In order to avoid interference with the ladle 29, the pellet guide tube 75 is bent into a shape that avoids the movement trajectory of the ladle 29 that moves during hot water supply. Since the discharge unit 42 is held at a fixed position by a clamp portion 47 (shown in FIGS. 3 and 4), the pellet guide tube 75 bent in advance to a predetermined shape can be used regardless of the molding operation of the die casting machine 10. The pellet discharge port 75b is always held at a fixed position with respect to the pouring port 26a. The pellet guide tube 75 configured in this way guides the pellet in the inflow chamber 55 from dropping from the pellet outlet 77 toward the pouring port 26a.

  That is, the pellet supply device 18 of the present embodiment includes a heat-resistant pellet guide tube 75 disposed between the pellet outlet portion 77 of the discharge unit 42 and the pouring port 26 a of the injection sleeve 26. The pellet guide tube 75 functions as a guide means for guiding the pellet P in the inflow chamber 55 to fall toward the pellet discharge port 75b.

  The flow path cross-sectional area of the pellet guide tube 75 is smaller than the flow path cross-sectional area of the inflow chamber 55. For this reason, the pellet guide tube 75 functions as a throttle portion. Here, the flow path cross-sectional area of the inflow chamber 55 is a cross-sectional area in a direction perpendicular to the axis Z of the inflow chamber 55 through which air flows from the second connection hole 62 toward the third connection hole 63. For example, when the flow passage cross section of the inflow chamber 55 is circular as shown in FIG. 7, the inner diameter R2 of the pellet guide tube 75 is smaller than the inner diameter R1 of the inflow chamber 55.

  An air discharge opening 80 is formed on the peripheral wall of the body 50 at a position facing the first connection hole 61. A ventilation member 81 is attached to the body 50 so as to cover the air discharge opening 80. The ventilation member 81 has a ventilation hole group including a large number of ventilation holes 82. The air holes 82 may be other than a circle, or may be a group of air holes made up of a large number of slits.

  An example of the ventilation member 81 is a punching metal in which a large number of circular holes are formed by pressing a thin metal plate made of stainless steel or the like. In addition to the punching metal, for example, a mesh member such as a wire mesh or photo etching is used. An extremely thin perforated plate may be used. In short, it has a group of vent holes composed of vent holes 82 having an opening size smaller than the particle size of the pellets P, and has rigidity that is not deformed by the pressure of air supplied from the first connection hole 61 into the inflow chamber 55. Any member may be used.

  FIG. 8 is a perspective view showing an example of the ventilation member 81. The ventilation member 81 is made of a punching metal having a large number of ventilation holes 82 having an inner diameter of 1 mm or less. The ventilation member 81 has a shape curved in an arc shape along the outer surface of the peripheral wall of the body 50, and covers the air discharge opening 80 from the outside so as to cover the body 50 by a pair of binding band members 85 and 86. It is fixed.

  The binding band members 85 and 86 have band main bodies 85a and 86a whose diameters can be changed by screw members 87 and 88, respectively, and the second joint of the body 50 in a state where the band main bodies 85a and 86a are expanded. Both ends of the ventilation member 81 are fixed to the body 50 by being attached to the port 52 and the third joint port 53 and narrowing the diameters of the band main bodies 85a and 86a with the screw members 87 and 88.

  By employing the ventilation member 81 having such a configuration, molding is easy even with the ventilation member 81 having a small flow hole 82 and a small plate thickness, and in a state of being fixed to the body 50 even if the plate thickness is thin. Since the shape of the ventilation member 81 is easily maintained, it is possible to sufficiently cope with the pellet P having a small particle diameter.

  Next, the molding process of the die-cast product, the supply process of the release agent and pellets (lubricant) P, etc. will be described. The control unit 19 executes a die casting product molding process based on a computer program stored in the memory. Further, a release agent coating step and a pellet supply step described below are performed for each cycle of the molding process. The release agent is applied with the molds 20 and 21 open as shown in FIG. The pellets are supplied in a state where the molds 20 and 21 are closed.

  As shown in FIG. 1, the nozzle unit 32 is inserted between the molds 20 and 21 by the robot 31. Under this state, a release agent is sprayed from the nozzle unit 32 toward the inner surfaces 20a and 21a of the molds 20 and 21 or air is ejected according to the types of the molds 20 and 21 and molding conditions. To do. For example, by blowing air onto the molds 20 and 21, the flashing or the like is removed, and the inner surfaces 20 a and 21 a of the molds 20 and 21 are cleaned. The mold release agent applied to the inner surfaces 20a and 21a of the molds 20 and 21 prevents the molded product from adhering to the molds 20 and 21.

  A predetermined amount of pellets P measured by the pellet measuring unit 40 is moved toward the discharge unit 42 in the pellet transfer pipe 41 by the pellet transfer air supplied from the compressed air supply source 35, and the inflow chamber 55. To be pumped. The pellets P and air supplied to the inflow chamber 55 are ejected from the first connection hole 61 into the inflow chamber 55 and move toward the air discharge opening 80 to collide with the ventilation member 81.

  Of the air and pellets P that collide with the ventilation member 81, the air passes through the ventilation holes 82 of the ventilation member 81 and is released to the outside of the body 50. Since the pellet P that collides with the ventilation member 81 cannot pass through the ventilation hole 82, it collides with the inner surface of the ventilation member 81, and then falls downward due to its own weight. The pellet P that has fallen downward enters the pellet guide tube 75 from the pellet outlet 77 of the third connection hole 63 formed at the bottom of the body 50, and moves downward to reach the lowermost pellet discharge port of the pellet guide tube 75. 75b is supplied to the pouring port 26a of the injection sleeve 26.

  The pellet P supplied into the injection sleeve 26 is vaporized by the heat of the injection sleeve 26, and the lubricant component adheres to the inner surface of the injection sleeve 26, whereby the injection sleeve 26, the plunger 27, and the plunger tip 27a slide. The part can be lubricated.

  Since the ventilation member 81 has a group of ventilation holes made up of a large number of ventilation holes 82, if the particle size of the pellets P that collide with the ventilation member 81 varies, the particle size of the pellets P is larger than the inner diameter of the ventilation holes 82. However, the slightly larger one may just fit into the vent hole 82 and adhere to the vent hole 82.

  Therefore, after the pellet supply process is completed, air for in-line air purging is supplied from the air supply pipe 70 to the inflow chamber 55 for a predetermined time (for example, about 4 to 5 seconds). Since the flow path cross-sectional area of the pellet guide pipe 75 communicating with the inflow chamber 55 is smaller than the flow path cross-sectional area of the inflow chamber 55, the pellet guide pipe 75 functions as a throttle portion. For this reason, a part of the air supplied to the inflow chamber 55 flows from the air discharge opening 80 to the outside of the ventilation member 81 through the ventilation member 81. Due to the pressure of the air, the pellets sandwiched between the vent holes 82 can be discharged to the outside of the vent member 81. That is, the ventilation member 81 can be cleaned.

  A part of the air supplied from the air supply pipe 70 to the inflow chamber 55 enters the pellet guide pipe 75 from the pellet outlet part 77 on the upper end side of the pellet guide pipe 75, and the pellet on the lower end side of the pellet guide pipe 75. It exits from the discharge port 75b. Since the pellet guide tube 75 can be cooled by the air flow, the pellet guide tube 75 located near the injection sleeve 26 can be prevented from being heated to a high temperature, and the pellet is melted on the inner surface of the pellet guide tube 75. The cause of clogging such as adhering can be prevented.

  That is, the air supply pipe 70 and the air control unit 71 function as cooling means for cooling the pellet guide pipe 75 by flowing air into the pellet guide pipe 75. Even if a part of the pellet is welded to the inner surface of the pellet guide tube 75, the pellet can be discharged by the air supplied from the air supply tube 70, and thus functions as a cleaning unit.

  The supply amount of air per unit time supplied from the air supply pipe 70 to the inflow chamber 55 can be adjusted by operating the operation portion 73a of the control valve 73 that controls the air speed. For this reason, among the air supplied from the air supply pipe 70 to the inflow chamber 55, the amount of cleaning air toward the ventilation member 81 and the amount of cooling air toward the pellet guide pipe 75 are distributed in an appropriate balance. In this manner, the control valve 73 is adjusted by the operation unit 73a. This control valve 73 is provided in an in-line air purge air supply pipe 70 that is independent of the pellet transfer pipe 41, and also allows the pellets in the inflow chamber 55 to flow backward toward the air supply pipe 70. Since it is prevented by the check valve 72, pellets can be transferred without any problems even if a control valve 73 for controlling air is provided.

  After the pellet supply process is completed and the pellet P supplied into the injection sleeve 26 is melted, as part of the molding cycle of the die casting machine 10, the molten metal is injected from the injection hole 26a by the ladle 29 in the pouring process. Supplied in. Further, when the plunger 27 is advanced by the drive unit 28, the molten metal in the injection sleeve 26 is supplied to the cavity 22. The molten metal injected into the cavity 22 is solidified by being held and cooled, and becomes a molded product having a shape corresponding to the cavity 22.

  After the molded product is solidified, the moving-side mold 21 is separated from the fixed-side mold 20 by the die plate driving mechanism 15. When the molds 20 and 21 are thus opened, the molded product is attached to the moving mold 21. In the molded product removal step, the molded product adhering to the moving mold 21 is pushed out of the moving mold 21 by an ejector pin (not shown), and the molded product is moved by the robot to the moving mold 21. And one molding cycle is completed.

  As described above, according to the present embodiment, in the pellet supply device 18 for transferring pellets by air, only air is released from the air and pellets supplied into the inflow chamber 55, and the pellets in the inflow chamber 55 are removed. The pellet guide tube 75 can guide the injection sleeve 26 to the pouring port 26a. For this reason, it is possible to avoid problems such as pellets scattered around the pouring port 26a.

  Further, since the pellet guide tube 75 can be cooled by flowing air through the pellet guide tube 75, it is possible to avoid the pellets from adhering to the inner surface of the pellet guide tube 75 due to the influence of heat, and in the unlikely event that the pellets Even if it adheres to the inner surface of the pellet guide tube 75, the pellet guide tube 75 can be prevented from being clogged, for example, the pellet can be discharged by air.

  In carrying out the present invention, it goes without saying that specific aspects of various elements constituting the die casting machine can be changed as required, including the specific structure of the pellet supply apparatus. The pellet may be a multifunctional composite pellet containing both a lubricant component and a release agent component.

  DESCRIPTION OF SYMBOLS 10 ... Die casting machine, 18 ... Pellet feeder, 19 ... Control unit (control means), 20 ... Fixed side mold, 21 ... Moving side mold, 26 ... Injection sleeve, 26a ... Pouring gate, 27 ... Plunger, 29 ... Ladle, 41 ... Pellet transfer pipe, 42 ... Discharge unit, 47 ... Clamp part, 50 ... Body, 55 ... Inflow chamber, 70 ... Air supply pipe, 71 ... Air control unit, 72 ... Check valve, 73 ... Control valve 75 ... Pellet guide tube (guide means), 75b ... Pellet discharge part, 77 ... Pellet outlet part, 81 ... Ventilation member.

Claims (4)

A pellet supply device for supplying pellets to a pouring port of an injection sleeve,
A pellet transfer tube through which the pellets and pellet transfer air flow;
The pellet that is supported by a member on the fixed side of the die casting machine at a position higher than the pouring port, has an inflow chamber to which the pellet and air are supplied by the pellet transfer pipe, and is supplied to the inflow chamber A discharge unit having a ventilation member that allows air to flow out of air and prevents passage of pellets;
A heat-resistant pellet guide tube disposed between the pellet outlet formed at the bottom of the discharge unit and the pouring port, and the pellet discharge port at the lower end of the pellet guide tube is located above the pouring port; A guide means that opens to a fixed position and guides the pellet guide pipe to drop the pellet in the inflow chamber toward the pouring gate;
A cooling means for cooling the pellet guide pipe by flowing air into the pellet guide pipe by an air supply pipe different from the pellet transfer pipe;
A pellet supply apparatus comprising:   The pellet supply apparatus according to claim 1, wherein the pellet guide pipe is formed of a metal pipe that can be bent and bent to a shape that avoids a ladle for supplying molten metal to the pouring port.   The pellet supply apparatus according to claim 2, further comprising a clamp portion for fixing the discharge unit to a member on a fixed die plate side of the die casting machine.   The cooling means includes a check valve for preventing pellets in the inflow chamber from moving toward the air supply pipe, and a control valve for controlling the speed of air supplied from the air supply pipe to the inflow chamber. The pellet supply apparatus according to claim 1, wherein the apparatus is a pellet supply apparatus.

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