JP2005262265A - Load adjusting mechanism for powder and granule used as raw material for mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load adjusting mechanism for powder and granules used as a raw material for a mold, in which the powder and the granules are hardly leaked from the periphery of a shutter mechanism arranged between a hopper and a blow head. <P>SOLUTION: The load adjusting mechanism is provided with: a blow head 7, which accumulates and temporarily stores resin-coated sand supplied from a hopper 30, and which supplies the sand to a metal mold 9 by a predetermined quantity; a shutter 19 disposed midway in a supplying passage unit 13 (a cylindrical body 15) for supplying the sand from the hopper 30 to the blow head 7; and an air tank, which supplies high-pressure gas into the blow head 7. Under a condition that the supply of the sand from the hopper 30 to the blow head 7 is shut off by the shutter 19, high-pressure air is supplied from the air tank to supply the sand from the blow head 7 to the metal mold 9. A pressure release unit 24 (a cushion plate 28) is disposed in the cylindrical body 15 in order to block direct flowing down of the sand in the direction to the blow head 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a load adjustment mechanism for a mold raw material powder used in a mold such as a resin molding sand for shell molding used in a shell mold method such as sand mold casting or a casting sand used in a cold box method or the like. It is about.

  Conventionally, in a shell mold molding machine using, for example, a resin-coated sand, the resin-coated sand accommodated in the hopper is once stocked in a blow head connected to the lower side, and a predetermined amount of resin-coated sand is injected into the mold from the blow head. Sand is supplied sequentially. The blow head is a kind of reserve tank, and high pressure air is supplied from the air tank adjacent to the blow head into the blow head. As a result, the internal pressure increases, and a predetermined amount of resin-coated sand is injected from the injection port and filled into the mold. It has a structure. The resin-coated sand filled in the mold is thermally cured and formed into a mold having a predetermined shape. Patent document 1 is given as an example of such a conventional shell molding machine.

In this type of shell molding machine, when high-pressure air is supplied from the air tank into the blow head, the supply passage from the hopper to the blow head is once shielded by the shutter. This is because the blow head arranged as the original position below the hopper slides and moves to a position where it comes into contact with the mold when the resin-coated sand is injected into the mold. The resin-coated sand in the hopper is blocked by a shutter so as not to fall. That is, the shutter functions as a kind of bottom cover of the hopper. When a predetermined amount of resin-coated sand is injected into the mold, the blow head returns to the original position, and at the same time, the shutter is opened and the resin-coated sand corresponding to the decrease is automatically replenished from the supply passage. It becomes.
JP 2000-25026 A

However, the following problems occur in the above configuration.
In other words, the resin-coated sand that accumulates in the supply passage from the hopper to the blow head causes a large load applied to the lower position of the supply passage and the internal pressure becomes too high. There is a case where a situation occurs in which it falls out into the blow head without going through the original supply passage. For this reason, the amount of sand stocked in the blow head has exceeded the originally planned amount. Therefore, when high-pressure air is supplied into the blow head, the pressure resistance based on the increased amount of resin-coated sand causes pressure drop near the injection port at the lower part of the blow head. There was a case that could not be injected inside. For this reason, the resin-coated sand is not sufficiently distributed in the mold, and a mold containing so-called “pox” may be formed.
The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a load adjusting mechanism for the mold material granular material that prevents the mold material powder granular material from leaking out as much as possible from the periphery of the shutter mechanism disposed between the hopper and the blow head. .

In order to achieve the above object, according to the first aspect of the present invention, a hopper and a mold raw material powder (hereinafter referred to as a powder granule) disposed below the hopper and supplied from the hopper are accumulated. The blow head capable of temporarily storing and supplying the same granular material by a predetermined amount, and the supply passage disposed in the middle of the supply passage for supplying the granular material from the hopper to the blow head. A shutter mechanism that can be shut off, a pressurizing mechanism that supplies high-pressure gas into the blow head, and a mold that receives a predetermined amount of powder from the blow head. A high pressure is applied from the pressurizing mechanism in a state where the granular material injection port is coincident with the granular material injection port of the mold and the supply passage of the granular material from the hopper to the blow head is blocked by the shutter mechanism. To be supplied with gas To increase the internal pressure in the blow head, supply the granular material to the mold through the granular material injection port and the granular material injection port, heat and cure the granular material in the mold, and mold The mold molding machine is configured to obtain a buffer body that prevents direct flow of powder particles in the direction of the blow head in a supply passage on the way from the hopper to the shutter mechanism. The gist.
Further, in the invention according to claim 2, in addition to the configuration of the invention according to claim 1, in the supply passage on the way from the hopper to the shutter mechanism, an opening communicating with the outside is formed at an upper position than the buffer. This is the gist.
Further, in the invention according to claim 3, in addition to the configuration of the invention according to claim 1 or 2, the supply passage on the way from the hopper to the buffer body has a passage diameter compared to the supply passage below the buffer body. The gist of the present invention is that it is a small-diameter passage configured narrowly.
Further, in the invention according to claim 4, in addition to the configuration of the invention according to claim 3, the projected area when the buffer is projected in the perpendicular direction is at least equal to or greater than the cross-sectional area of the small diameter passage. The gist.
Further, in the invention according to claim 5, in addition to the structure of the invention according to claim 4, the buffer body is formed in a disk shape, the small diameter passage is formed in a cylindrical shape, and the buffer body is formed with the same small diameter passage. The gist of the invention is that the outer diameter of the buffer is at least equal to or larger than the inner diameter of the supply passage when arranged concentrically.

  In the configuration as described above, the granular material charged into the hopper is once accumulated in the blow head, and the granular material is supplied from the blow head to the mold. The blow head increases the internal pressure in the blow head by supplying a high-pressure gas from the pressurizing mechanism, and supplies the granular material to the mold through the granular material injection port and the granular material injection port. When the high-pressure gas is supplied, the powder material supply passage from the hopper to the blow head is blocked by the shutter mechanism. The presence of a large amount of powder particles put into the hopper increases the internal pressure of the supply passage, but the powder particles flow directly in the direction of the blow head in the supply passage on the way from the hopper to the shutter mechanism. Since the buffer body which prevents this is arranged, the internal pressure applied to the supply passage is dispersed. As a result, the load of the granular material deposited on the shutter mechanism is prevented from being concentrated.

Here, it is preferable that an opening communicating with the outside is formed in a supply path on the way from the hopper to the shutter mechanism and above the buffer. This is because the internal pressure in the supply passage is released by adopting such a configuration.
Moreover, it is preferable that the supply passage on the way from the hopper to the shock absorber is a small diameter passage having a narrower passage diameter than the supply passage below the shock absorber. Furthermore, it is preferable that the projected area when the buffer is projected in the perpendicular direction is at least equal to or greater than the transverse area of the small diameter passage. In that case, the buffer body is configured in a disc shape and the small diameter passage is formed in a cylindrical shape, and when the buffer body is disposed concentrically with the small diameter path, the outer diameter of the buffer body is at least that of the supply path. It is preferable that it is more than an internal diameter.

  According to the invention of each of the above claims, since the load of the granular material deposited on the shutter mechanism is prevented from being concentrated, the granular material leaks out from the shutter mechanism and blows from a route other than the supply passage. It will not fall into the head.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, “left and right” refers to the left and right direction of the shell molding machine 1 in FIG. 2 or 3. Further, the right direction of the shell mold molding machine 1 in FIG.
As shown in FIGS. 1 to 4, the shell mold molding machine 1 of the present embodiment is based on a bed 2 and a column 3, and a sand throwing unit 5 for feeding resin-coated sand (hereinafter referred to as “sand”) to these. A head 7 and a mold 9 are respectively provided. First, the sand throwing-in part 5 disposed in the upper position of the column 3 and its peripheral structure will be described.
The column 3 is composed of reinforcing walls 10 and 11 erected in the front-rear direction and a ceiling portion 12 that connects upper portions of the reinforcing walls 10 and 11. As shown in FIG. 3, an alloy supply passage unit 13 is disposed inside the ceiling portion 12. As shown in FIGS. 5 to 7, the supply passage unit 13 includes a cylindrical tube body 15 as a supply passage. A square-shaped flange 16 is formed on the upper end periphery of the cylindrical body 15. A square bottom plate 17 is formed at the lower end of the cylindrical body 15. As shown in FIG. 6, a through hole 14 having a smaller diameter than the inner diameter of the cylindrical body 15 is provided in the center of the bottom plate 17.

As shown in FIG. 7, a pair of opposing angle portions 18 are formed on the back surface of the bottom plate 17, and a shutter 19 is supported by the angle portion 18 so as to be slidable. A first engagement plate 20 is erected upward at the tip of the shutter 19. A second engagement plate 21 is erected on the upper surface of the bottom plate 17, and a coil spring 22 is disposed between the engagement plates 20, 21. The shutter 19 is always urged by a coil spring 22 in a direction away from the lower position of the bottom plate 17. As shown in FIGS. 6, 12, and 13, a circular through hole 23 is formed at a substantially central position of the shutter 19, and the shutter 19 as shown in FIG. 12 is pulled into a position below the bottom plate 17. In FIG. 2, the through hole 23 is arranged at a position coinciding with the through hole 14 (hereinafter, this arrangement state of the shutter 19 is referred to as a shutter open state). An engagement protrusion 29 is formed on the base end of the shutter 19 so as to protrude downward.
The supply passage unit 13 configured as described above is supported on the rib 12a on the top surface of the ceiling portion 12 by the flange 16 so that the portion below the cylinder 15 passes through the ceiling portion 12 and hangs down.

  As shown in FIGS. 3 and 10, a pressure release unit 24 made of an alloy is disposed at an upper position of the supply passage unit 13. As shown in FIGS. 8 to 10, the pressure release unit 24 includes a cylindrical small-diameter cylindrical body 25 as a small-diameter passage. A square-shaped flange 26 is formed on the upper end periphery of the small-diameter cylindrical body 25. Three hanging rods 27 are formed in a hanging manner around the small-diameter cylindrical body 25 at positions shifted by 120 degrees. A buffer plate 28 serving as a buffer is connected to the lower end of the hanging rod 27. The buffer plate 28 has a disk shape slightly larger than the outer diameter of the small-diameter cylindrical body 25 and is disposed at a position slightly separated from the lower end edge of the small-diameter cylindrical body 25.

The pressure release unit 24 configured in this way is supported on the flange 16 of the supply passage unit 13 by the flange 26, and is arranged so that a portion below the small diameter cylindrical body 25 hangs down inside the cylindrical body 15. The two flanges 16 and 26 are arranged in an overlapping state, and as shown in FIG. 10, a gap S is formed between the flanges 16 and 26 with four spacers 33 interposed therebetween. The cylindrical body 15 of the supply passage unit 13 is communicated to the outside by the gap S.
A hopper 30 is installed above the pressure release unit 24. The hopper 30 is configured in a cylindrical shape having a square cross section that is expanded in a tapered shape toward the top. As shown in FIGS. 3 and 10, a flange 31 is formed at the lower end of the hopper 30.
The hopper 30, the pressure release unit 24, and the supply passage unit 13 are fixed to the rib 12 a on the top surface of the ceiling portion 12 with the flanges 16, 26, and 31 being overlapped by bolts 32. A raw material supply tower 34 for supplying sand to the hopper 30 is provided upright at a position adjacent to the column 3.

As shown in FIGS. 1 to 4, a beam 35 projects from the ceiling 12 of the column 3 toward the left. A rail 36 is formed from the interior of the ceiling 12 to the tip of the beam 35. On the rail 36, a carrier 37 supported by a rolling roller 34 is disposed. The blow head 7 is supported by being suspended from a carrier 37. As shown in FIGS. 1 and 4, the blow head 7 is provided with a rod 38, and the blow head 7 is suspended from the carrier 37 by being supported by a support frame 39 attached to the carrier 37. It is done. As a result, the blow head 7 is movable from the inside of the column 3 (that is, directly below the ceiling portion 12) to the vicinity of the tip of the beam 35. A damper device 41 is disposed at an intermediate position of the rod 38.
As shown in FIG. 1 to FIG. 3 and FIG. 11, the blow head 7 includes a cylindrical main body 45 and a widened portion 46 that is widened in a tapered shape and connected to the lower portion of the main body 45. A pipe 47 that hangs down toward the inside of the main body 45 is disposed on the upper portion of the main body 45. The pipe 47 is supported by an engaging flange 44 with respect to a stepped portion 43 formed at the upper edge of the main body 45. The engagement flange 44 does not protrude above the upper end edge of the main body 45. The raw material sand supplied from the hopper 30 passes through the pipe 47 from the cylinder 15 and is accumulated in the lower part in the blow head 7. In this embodiment, the tip of the pipe 47 is disposed slightly below the center of the main body 45 in the vertical direction. Two injection ports 49 are formed on the bottom surface 48 of the expanding portion 46. An injection nozzle 50 capable of discharging sand only at the time of pressurization is disposed at the injection port 49.
A first air cylinder 51 is disposed near the upper portion of the front surface of the reinforcing wall 10 of the column 3. The tip of the rod 52 of the first air cylinder 51 is connected to a bracket 53 that extends from the carrier 37. As a result, as the rod 52 advances and retreats, the carrier 37 moves on the rail 36 in the left-right direction.

  As shown in FIGS. 1 and 4, second and third cylinders 55 and 56 are disposed at the upper end position of the beam 35. A high pressure air tank 57 is disposed on the back surface of the column 3. The second cylinder 55 advances a rod (not shown) in a state where the blow head 7 is disposed at a position below the second cylinder 55 and presses the blow head 7 downward. A hose 58 of the high-pressure air tank 57 is connected to the third cylinder 56. The third cylinder 56 serves as a relief valve in releasing high-pressure air from the high-pressure air tank 57. High-pressure air from the high-pressure air tank 57 can be discharged from a rod tip (not shown) of the second cylinder 55 via the third cylinder 56.

  As shown in FIGS. 1 to 4, a mold 9 is disposed on the upper portion of the bed 2 via a rotating frame 60. The rotating frame 60 is composed of two rectangular base plates 61 and 62 arranged on the front and rear sides and four guides 63 connecting the base plates 61 and 62. The rotating frame 60 is pivotally supported by bearings 64 and 65 disposed before and after the bed 2. The mold 9 as a split mold is composed of first and second molds 67 and 68 and is disposed in the guide 63 of the rotating frame 60. As shown in FIG. 4, an injection port 69 is formed at the upper position of the contact surfaces of both molds 67 and 68.

  Fourth and fifth cylinders 70 and 71 are disposed before and after the rotating frame 60, respectively. Both molds 67 and 68 are brought into contact with and separated from each other by a fourth cylinder 70. Further, the molded mold is pushed by the fourth cylinder 70 and always remains on the second mold 68 side. A pair of left and right sixth cylinders 72 is disposed behind the second mold 68. The second mold 68 is rotated 90 degrees downward by the sixth cylinder 72 when both molds 67 and 68 are released after the mold is fired. The molded mold is pushed by the fifth cylinder 71 and falls onto the bed 2. A rotating mechanism 73 composed of a rack, a pinion, a cylinder, and the like is disposed behind the rotating frame 60. In the case of molding a complicated mold or the like, the rotating frame 73 rotates the rotating frame 60 by 180 degrees. In other words, it is possible to inject sand from the injection port formed on the opposite side by reversing the mold (in this embodiment, it is not reversed).

Next, the operation of the shell mold molding machine 1 configured as described above will be described in detail. The state where the blow head 7 shown in FIG. 3 is arranged on the lower surface of the ceiling portion 12 will be described below as the original position. It is assumed that the following operations are operated under the control of a computer by a control panel (not shown).
In the state where the blow head 7 is disposed at the original position, the sand introduced into the hopper 30 passes through the small diameter cylindrical body 25 of the pressure release unit 24 and reaches the cylindrical body 15 of the supply passage unit 13. It accumulates in the main body 45 through the pipe 47 from above. At this time, as shown in FIG. 12, the shutter 19 at the bottom of the supply passage unit 13 has its engaging projection 29 engaged with the main body 45 of the blow head 7, so that the right side in the figure against the urging force of the coil spring 22. The through hole 23 of the shutter 19 and the cylindrical body 15 through hole 14 are overlapped. Therefore, the sand can be supplied from the supply passage unit 13 through the through holes 14 and 23 toward the blow head 7.
As shown in FIG. 3, the sand accumulated in the lower portion of the blow head 7 is piled up in a mountain shape with the lower end of the pipe 47 as the apex. In other words, the lower end of the pipe 47 serves as a kind of lid for sand in the blow head 7. When a predetermined amount of sand is discharged from the injection nozzle 50 and the height of the mountain is lowered, a gap is formed between the lower end of the pipe 47. Then, new sand is automatically added and replenished from the pipe 47, and the replenishment stops when the mountain reaches the lower end of the pipe 47 again. Accordingly, the cylinder 15 and the pipe 27 of the supply passage unit 13 that normally receives the supply of sand from the hopper 30 are in a state where the sand is tightly packed without any gap until the next discharge from the injection nozzle 50 is performed.

  Here, the weight of the sand is not directly applied to the shutter 19, but is once relaxed by the buffer plate 28 of the pressure release unit 24. In addition, the internal pressure based on the weight of the sand applied to the entire inner surface of the cylinder 15 is also released from the gap S and thus reduced. As a result, leakage from the gap around the shutter 19 (for example, the gap between the shutter 19 and the through hole 14), which is the only seam from the hopper 30 to the blow head 7, almost leaks out due to the pressure based on the weight of the sand. Disappear.

Next, the operation of the blow head 7 when supplying a predetermined amount of sand to the mold 9 will be described.
When the first air cylinder 51 is driven, the carrier 37 is moved to the left along the rail 36, and the blow head 7 at the original position is also moved together. With this movement, the engagement between the main body 45 of the blow head 7 and the engagement protrusion 29 of the shutter 19 is released as shown in FIG. As the blow head 7 moves, the shutter 19 slides to the left in the figure by the urging force of the coil spring 22, and finally the through hole 23 of the shutter 19 and the cylinder 15 through hole 14 in FIG. It is arranged at a completely displaced position. That is, the bottom surface of the cylinder 15 is shielded by the shutter 19, and the sand does not fall downward from the supply passage unit 13.
The blow head 7 moved together with the carrier 37 is stopped at a position near the tip of the beam 35 shown in FIG. 2, that is, a position above the mold 9 and a position where the injection nozzle 50 and the injection port 69 coincide (this position is injected). Position). The second cylinder 55 is driven at the injection position to press the blow head 7 downward. The blow head 7 is brought into close contact with the mold 9 in a state where the injection nozzle 50 and the injection port 69 are connected by the second cylinder 55. The molds 9 (both molds 67 and 68) are brought into close contact with each other by the fourth cylinder 70.

Next, the third cylinder 56 is driven, and high-pressure air is supplied from the hose 58 of the high-pressure air tank 57 into the blow head 7 via the second cylinder 55. Then, the internal pressure in the blow head 7 increases, and the sand accumulated in the lower part of the blow head 7 is supplied from the injection nozzle 50 into the mold 9 through the injection port 69.
And according to a conventional method, the sand is heated and held in the mold 9 to be cured. On the other hand, when the injection of a predetermined amount of sand is completed, the third cylinder 56 is driven again, and the supply of high-pressure air from the high-pressure air tank 57 is stopped. Nearly simultaneously, the second cylinder 55 is also driven again, and the close contact relationship between the blow head 7 and the mold 9 is released.
Then, the first air cylinder 51 is driven to return the blow head 7 moved together with the carrier 37 to the original position. Then, the shutter 19 is again opened as shown in FIG. Since the amount of sand supplied to the mold 9 is reduced in the blow head 7 returned to the original position, the sand is automatically replenished to the lower end position of the pipe 47 as described above. On the other hand, in order to take out the sand (mold) hardened in the mold 9, the molds 67 and 68 are separated from each other, and then the sixth cylinder 72 is driven to move the mold 68 downward, and then the fifth The cylinder 71 is driven to release the mold.

With this configuration, the following effects are achieved in the present embodiment.
(1) The buffer plate 28 of the pressure release unit 24 prevents the weight in the cylinder 15 on the way from the hopper 30 to the blow head 7 from being directly applied to the shutter 19, so that sand leaks from the periphery of the shutter 19. The amount of spilled sand does not enter the main body 45 of the blow head 7 from around the engaging flange 44 other than the pipe 47. As a result, the amount of sand accumulated in the main body 45 becomes constant, and when high-pressure air is supplied from the high-pressure air tank 57 into the blow head 7, the pressure inside the blow head 7 is kept constant, which is stable. An amount of sand can be supplied to the mold 9.
(2) In the pressure release unit 24, the gap S is formed between the hopper 30 and the supply passage unit 13 in addition to the buffer plate 28, so that the internal pressure due to sand accumulation is released from the gap S, and more than necessary. In addition, no pressure is applied to the shutter 19.
(3) Since the resistance due to passage is increased by the small-diameter cylindrical body 25 of the pressure release unit 24, the pressure on the shutter 19 is reduced. Furthermore, since the buffer plate 28 is larger than the inner diameter of the small-diameter cylinder 25, all the sand flowing down the small-diameter cylinder 25 is basically prevented from flowing directly downward by the buffer plate 28. The weight applied to the shutter 19 can be more effectively distributed.
(4) Since the pressure release unit 24 is configured separately from the supply passage unit 13, maintenance inspection and replacement can be performed independently.

It should be noted that the present invention can be modified and embodied as follows.
The pressure release unit 24 is designed to release the internal pressure by forming a gap S as an opening between the hopper 30 and the supply passage unit 13 (cylinder 15). Since the effect is great, the gap S is not necessarily required.
-The shape of the buffer plate 28 as a buffer is not limited to the above. It may have a three-dimensional outer shape.
A plurality of buffer plates 28 as buffer bodies may be arranged (in series in the vertical direction).
In the above-described embodiment, the pressure release unit 24 is used to configure the opening that communicates with the buffer body to the outside. You may make it comprise.
In the above embodiment, the blow head 7 is configured to move to the upper position of the mold 9, but conversely, even in a shell mold molding machine in which the mold moves to a position below the blow head. I do not care. If the blow head does not move, the sand does not fall, but the shutter is still necessary, which causes a problem of sand leakage. This is because even with this type, without a shutter, the shielding ability is inferior and the internal pressure in the blow head cannot be increased.
-It can also be applied to molding machines other than shell mold molding machines.
It is a reason to implement in the aspect changed in the range which does not deviate from the meaning of this invention.

The perspective view of the shell mold molding machine of embodiment of this invention. The front view of the same shell molding machine. The partially broken partial omission front view of the same shell mold molding machine. The side view of the same shell molding machine. The perspective view of a supply channel | path unit. The top view of a supply channel | path unit. The partially broken rear view of a supply channel | path unit. The perspective view of a pressure release unit. The front view of a pressure release unit. Sectional drawing of the pressure relief unit periphery arrange | positioned in the supply channel | path unit upper part. The side sectional view of a blow head. Sectional drawing explaining that the shutter of a supply path unit lower part exists in an open state. Sectional drawing explaining that the shutter of a supply path unit lower part exists in a closed state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Shell mold molding machine, 7 ... Blow head, 9 ... Mold, 15 ... Cylindrical body as supply passage, 19 ... Shutter which comprises a part of shutter mechanism, 11 ... Gap, 15 ... Flexible packing, 25 A small diameter cylindrical body as a small diameter passage, 28 a buffer plate as a buffer, 30 a hopper, 49 an injection port as a granular material injection port, 56 a third cylinder constituting a part of the pressurizing mechanism, 57 ... High-pressure air tank constituting a part of the pressurizing mechanism, 69 ... Injecting port as a granular material inlet, S ... A gap as an opening.

Claims (5)

With a hopper,
The mold raw material powder (hereinafter referred to as powder) that is disposed below the hopper and supplied from the hopper is accumulated and temporarily stored, and the powder is supplied in a predetermined amount. Possible blow heads,
A shutter mechanism that is arranged in the middle of a supply passage for supplying powder from the hopper to the blow head and can block the supply passage;
A pressurizing mechanism for supplying high-pressure gas into the blow head;
A mold for receiving a predetermined amount of powder from the blow head, and
In the state where the granular material injection port of the blow head and the granular material injection port of the mold are coincident and the supply passage of the granular material from the hopper to the blow head is blocked by the shutter mechanism, The high pressure gas is supplied from the pressure mechanism to increase the internal pressure in the blow head, and the powder is supplied to the mold through the powder injection port and the powder injection port. A mold molding machine that heats and hardens the powder and obtains a mold,
A load adjusting mechanism for a granular material for a mold material, wherein a buffer for preventing direct flow of the granular material in the direction of the blow head is disposed in a supply passage on the way from the hopper to the shutter mechanism. The load adjustment of the granular material for mold raw material according to claim 1, wherein an opening communicating with the outside is formed at an upper position than the buffer body in a supply passage on the way from the hopper to the shutter mechanism. mechanism. The supply passage in the middle from the hopper to the shock absorber is a small-diameter passage having a narrow passage diameter as compared with a supply passage below the shock absorber. Load adjustment mechanism of powder for mold materials. The load adjustment mechanism for the granular material for mold raw material according to claim 3, wherein a projected area when the buffer body is projected in a perpendicular direction is at least equal to or greater than a cross-sectional area of the small diameter passage. The buffer body is configured in a disc shape and the small-diameter passage is configured in a cylindrical shape, and when the buffer body is disposed concentrically with the small-diameter path, the outer diameter of the buffer body is at least greater than the inner diameter of the supply passage The load adjusting mechanism of the powder for mold material according to claim 4, wherein

Images