JP6687400B2 - Mold making equipment - Google Patents

Description

  The present invention relates to a mold manufacturing apparatus used for casting, and more particularly to a mold manufacturing apparatus adapted to mold a mold using steam.

  Various types of mold manufacturing techniques have been conventionally provided, but recently, a binder coated sand (so-called resin coated) prepared by forming a layer of a solid binder on the surface of a refractory aggregate. Sand) is used to fill this binder coated sand into the mold, and then steam is blown into this mold to solidify or cure the binder in the binder coated sand, and to bond the fire-resistant aggregate. Attention has been paid to a technique for producing a mold formed by binding with an agent (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

  The invention of Patent Document 1 uses a binder coated refractory prepared by using a thermosetting resin such as a phenol resin as a binder. Then, the binder coated sand is filled in the mold, and when steam is blown into the mold, the steam has a high latent heat of condensation, so this latent heat is transferred when the steam contacts the binder coated sand, The binder coated sand can be instantly heated to cure the thermosetting resin of the binder, and a mold bonded with the cured thermosetting resin can be obtained. Therefore, it is possible to manufacture the mold in a short time, it is not necessary to heat the mold to a high temperature as in the case of manufacturing the mold by the shell mold method, and the generation of harmful gas is also reduced. Is something that can be done.

  The invention of Patent Document 2 uses a binder coated refractory prepared by using a sugar such as sugar as a binder. Then, the binder coated sand is filled in the mold, and when steam is blown into the mold, the temperature is lowered when the steam comes into contact with the binder coated sand, and condensed water is generated from the steam. Water causes the sugars of the binder to become pasty and sticky, and the sugars of the binder stick to the refractory aggregates. Then, the water is evaporated by the latent heat of the steam that is subsequently blown into the mold, and the saccharides of the binder can be solidified, and a mold bonded with the binder of the solidified saccharides can be obtained. It is possible. When casting high-temperature molten metal in the mold thus obtained, the sugar forming the binder is thermally decomposed, but the sugar is decomposed and only water and carbon dioxide gas are generated. There is no fear of deteriorating the environment, and since sugars are thermally decomposed at a relatively low temperature, they are also excellent in disintegration after casting.

  As described above, using the binder coated sand, the technique of filling the binder coated sand in the molding die and then blowing steam into the mold has various advantages, but there are problems to be further improved. That is, it is affected by the temperature of the working environment. That is, the temperature of the working environment is greatly different in summer and winter, and the binder coated sand is used in a low temperature in winter. Therefore, when the binder of the binder coated sand is a thermosetting resin, when the binder coated sand is heated in a mold after heating the binder coated refractory by blowing steam. It will take time to raise the temperature to a temperature above the curing temperature. Further, when the binder of the binder coated sand is a saccharide, steam is blown into a mold filled with the binder coated sand, the binder is gelatinized with condensed water of steam, and then steam is continuously blown. Therefore, when the binder coated refractory is heated to evaporate the water, it takes a long time to evaporate the water.

  Therefore, in winter, it is desirable to preheat the binder coated sand and to fill the mold with the temperature of the binder coated sand being raised. Even when the temperature is high, such as in summer, heating the binder-coated sand to a temperature at which the binder does not harden can further shorten the time required to manufacture the mold. .

  Preheating of the binder coated sand can be performed by attaching a heating device to a storage tank that stores the binder coated sand. As such a heating device, it is general to dispose a heat exchanger that allows a heat medium to pass through in the storage tank, or to provide the storage tank with a heating jacket. However, in this case, since the binder coated sand is heated by heat transfer from the heat exchanger or jacket, the efficiency of heating the binder coated sand is poor, and moreover, it does not come into contact with the heat exchanger or jacket. The heating temperature will be different between the binder coated sand in the part where it is present and the binder coated sand in the part that is far from the heat exchanger and the jacket, so that the binder coated refractory in the storage tank can be made uniform. There is a problem that it is difficult to heat.

  Therefore, in the inventions of Patent Document 4 and Patent Document 5, a gas is ejected from a nozzle hole arranged in the lower part of the storage tank, and the binder gas in the storage tank is suspended or agitated by the ejected gas. Or, the binder coated sand is heated in this state. In this way, by heating the binder coated sand while floating or stirring in the storage tank, the binder coated sand is heated while flowing in the storage tank, and the binder in the storage tank is heated. The coated sand is heated uniformly.

JP, 2000-107835, A International Publication No. 2011-030795 JP, 2013-166180, A JP 06-142837 A (Fig. 2) Japanese Patent Laid-Open No. 2001-321886 (FIGS. 1 and 2)

  However, as in the inventions of Patent Documents 4 and 5, only by suspending or stirring the binder-coated sand with the gas ejected from the nozzle holes in the lower portion of the storage tank, the entire binder-coated sand in the storage tank is removed. It is difficult to float or stir. Therefore, even if the inventions of Patent Documents 4 and 5 are used, it is still difficult to uniformly heat the binder coated sand in the storage tank, and a mold is produced using the uniformly heated binder coated sand. You cannot do it.

  The present invention has been made in view of the above points, the whole binder-coated refractory in the storage tank can be stirred and uniformly heated, and this uniformly heated binder-coated sand is used. An object of the present invention is to provide a mold manufacturing apparatus that can efficiently manufacture a mold by using the mold manufacturing apparatus.

  The present invention relates to a storage tank 10 for storing a binder coated sand 3 prepared by coating a refractory material with a binder, and a casting mold for filling the binder coated sand 3 supplied from the reservoir 10. Steam supply head for solidifying or curing the binder of the binder coated sand 3 by heating with steam by blowing steam into the mold 2 for molding and the mold 2 filled with the binder coated sand 3 5, which further comprises a gas supply device 201 for supplying the heated gas so that the heated gas is blown upward from the lower part thereof into the storage tank 10, and a tubular shape having upper and lower openings. The convection cylinder 202 is formed in the storage tank 10 at a position where the heated gas is blown into the cylinder from the opening at the lower end, and the opening at the upper end of the convection cylinder 202 is inside the convection cylinder 202. The binder coated sand in the convection tube 202 blown up by the heated gas is formed as the overflow port 203 blown out to the outside of the convection tube 202 in the storage tank 10 and the viscosity of the outside of the convection tube 202 is increased. A sand inflow hole 204 through which the binder coated sand flows into the convection tube 202 is formed on the side surface of the convection tube 202.

  According to the present invention, the binder coated sand supplied to the storage tank 10 flows into the convection cylinder 202 from the sand inlet hole 204, and the binder coated sand flowing into the convection cylinder 202 is supplied from the gas supply device 201. The heated heated gas is blown upward in the convection cylinder 202, overflows from the upper end overflow port 203 to the outside of the convection cylinder 202, and the binder coated sand flowing out of the convection cylinder 202 passes through the sand inflow hole 204. And flows into the convection cylinder 202. In this way, the binder coated sand in the storage tank 10 is convected between the inside and outside of the convection cylinder 202, and the entire binder coated sand in the storage tank 10 can be agitated by convection. Together with this, while convection the binder coated sand, it is possible to heat the binder coated sand with heated air to convection the binder coated sand, it is possible to uniformly heat the binder coated sand It is possible. Then, the binder coated sand 3 thus uniformly preheated is filled in the mold 2, and steam is blown into the mold 2 to heat the binder to remove the binder in the binder coated sand 3. It can be rapidly solidified or cured.

  Further, according to the present invention, the sand discharge port 205 is formed at the lower end of the storage tank 10, and the heating gas supplied from the gas supply device 201 is blown into the storage tank 10 through the sand discharge port 205. The convection tube 202 is characterized in that the opening at the lower end is arranged so as to face the sand discharge port 205.

  According to the present invention, the heating gas for convection the binder coated sand in the storage tank 10 and for heating the binder coated sand is the sand for discharging the binder coated sand in the storage tank 10. The storage tank 10 is blown into the storage tank 10 through the outlet 205, and it is not necessary to provide the storage tank 10 with a special opening for blowing heated gas into the storage tank 10, and the storage tank 10 is formed in a simple structure. Is something that can be done.

  Further, the present invention includes a filter body 206 arranged so as to close the opening at the lower end of the sand discharge port 205, the filter body 206 is a plate body 207, and a filter mesh that allows gas to pass but does not pass the binder coated sand. 208 is vertically stacked, the plate body 207 is provided with a sand passage hole 209 and a ventilation hole 210, and the filter net 208 is arranged at the ventilation hole 210 avoiding the sand passage hole 209. The sand passage hole 209 serves as a passage when the binder coated sand in the storage tank 10 is discharged from the sand discharge port 205, and the ventilation hole 210 is heated by the gas supply device 201. It is characterized in that it serves as a passage when the gas is blown into the storage tank 10.

  According to the present invention, the sand discharge port 205 of the storage tank 10 is supplied from the gas supply device 201 in a state where it is closed by the filter body 206 in a portion other than the sand passage hole 209 that serves as the discharge passage of the binder coated sand. The heating gas can be blown into the storage tank 10 through the ventilation holes 210 of the filter body 206, and the ventilation holes 210 in which the filter net 208 that does not pass the binder coated sand can be formed to have a large diameter. Therefore, the heated gas can be blown into the storage tank 10 with a large amount of air, and even if a large amount of the binder coated sand is stored in the storage tank 10, the binder coated sand can be convected without any trouble. It is possible.

  The filter body 206 is formed by stacking a plurality of plate bodies 207 and a filter net 208 sandwiched between the plate bodies 207, and the sand passage holes 209 and the ventilation holes 210 of each plate body 207 are vertically stacked. It is characterized in that it is provided so as to be arranged at the same position.

  By thus sandwiching the filter net 208 between the plate bodies 207, it is possible to bring the filter net 208 into close contact with the plate body 207 without fixing it, and to bond the filter net 208 from the gap between the plate body 207 and the filter net 208. The agent coated sand is prevented from leaking out, and the filter net 208 can be easily removed from the plate 207, which facilitates replacement and cleaning of the filter net 208.

  Further, the present invention is characterized by including an opening / closing tool 211 which is arranged in the storage tank 10 so as to be vertically movable and which vertically opens and closes the opening of the upper end of the sand passage hole 209 of the filter body 206.

  According to the present invention, the binder coated sand can be discharged from the sand discharge port 205 of the storage tank 10 through the sand passage hole 209 of the filter body 206, but the sand passage hole 209 is closed by the opening / closing tool 211. By this, it is possible to uniformly heat the entire amount of the binder coated sand in the storage tank 10 without causing a part of the binder coated sand from the storage tank 10 to enter the sand passage holes 209. Is.

  Further, the present invention includes a gas introduction body 215 formed by arranging the sand passage cylinder 214 inside the gas passage cylinder 213 having the connection port 212 connected to the gas supply device 201, and the gas passage cylinder 213 and the sand passage cylinder 213. The vent hole 210 of the filter body 206 is located on the upper surface of the gas passage chamber 216 formed between the cylinders 214, and the opening at the upper end of the sand passage cylinder 214 matches the opening at the lower end of the sand passage hole 209 of the filter body 206. As described above, the gas introduction body 215 is arranged below the filter body 206.

  The gas supply device 201 is connected to the filter body 206 through the gas introduction body 215, but if the ventilation hole 210 of the filter body 206 is located on the upper surface of the gas passage chamber 216 of the gas introduction body 215, the heating is performed. It is possible to ventilate gas from the gas passage chamber 216 to the ventilation hole 210 and supply it to the storage tank 10, and it is not necessary to accurately align the ventilation hole 210 and the gas passage chamber 216. Even if the vent holes 210 are provided in the filter body 206 at a plurality of positions, the filter body 206 and the gas introduction body 215 can be arranged without any trouble.

  Further, in the present invention, the filter body 206 is sandwiched between the lower surface of the sand discharge port 205 of the storage tank 10 and the upper surface of the gas introduction body 215, and at least one of the storage tank 10 and the gas introduction body 215 is vertically moved. It is characterized in that it is formed so as to be movable in the direction in which it comes close to and away from.

  According to the present invention, the filter body 206 can be taken out by separating the storage tank 10 from the gas introduction body 215, and the filter mesh 208 of the filter body 206 can be easily replaced or cleaned. .

  Further, according to the present invention, the storage tank 10 is provided with a sand detection sensor 217 for detecting the position of the upper surface of the binder coated sand in the convection cylinder 202 at a position facing the sand inflow hole 204 on the side surface of the convection cylinder 202. It is characterized by that.

  According to the present invention, the amount of the binder coated sand stored in the storage tank 10 can be detected by the height of the upper surface of the binder coated sand in the convection cylinder 202 detected by the sand detection sensor 217. The amount of the binder coated sand in the storage tank 10 can be kept constant by supplying the binder coated sand to the storage tank 10 according to the detected amount.

  Further, the present invention is provided with a shield 218 which is disposed in the storage tank 10 above the convection tube 202 and covers the overflow port 203 at the upper end of the convection tube 202 through a gap through which the binder coated sand passes. It is characterized by.

  According to the present invention, the shield 218 can prevent the binder coated sand in the convection cylinder 202 blown up by the heated gas from scattering outside the storage tank 10.

Further, the invention is characterized in that the lower surface of the shield 218 is formed as an inclined guide surface 219 which is inclined downward from the central portion to the outer peripheral portion.

According to the present invention, when the binder-coated sand in the convection cylinder 202 blown up by the heated gas hits the shield 218, the inclination of the inclined guide surface 219 on the lower surface of the binder causes the binder-coated sand to move to the convection cylinder 202. It is guided so as to flow outward, and the convection of the binder coated sand inside and outside the convection cylinder 202 is smoothly performed.

  Further, the present invention is characterized in that a heat exchanger 220 for passing a refrigerant is provided in the sand passage cylinder 214 of the gas introduction body 215.

  The heat of the heating gas passing through the gas passage chamber 216 acts on the sand passage cylinder 214 located in the gas passage chamber 216 of the sand passage cylinder 214, but the heat exchange of the temperature rise of the sand passage cylinder 214 is performed. This can be prevented by cooling with the vessel 220, and the binder coated sand can be prevented from adhering to the inner circumference of the sand passage cylinder 214.

  Further, the present invention is characterized in that the gas supply device 201 is provided with a dehumidifier 221 for dehumidifying air, and a heating blower 222 for heating and sending the dehumidified air.

  According to this invention, heated air that has been dehumidified and dried as heating gas can be supplied to the storage tank 10, and heating can be performed without moistening the binder coated sand. .

  According to the present invention, the binder coated sand supplied to the storage tank 10 flows into the convection cylinder 202 from the sand inlet hole 204, and the binder coated sand flowing into the convection cylinder 202 is supplied from the gas supply device 201. The heated heated gas is blown upward in the convection cylinder 202, overflows from the upper end overflow port 203 to the outside of the convection cylinder 202, and the binder coated sand flowing out of the convection cylinder 202 passes through the sand inflow hole 204. Flow into the convection cylinder 202, and the binder coated sand in the storage tank 10 convects between the inside and outside of the convection cylinder 202. The whole can be stirred by convection. Therefore, it is possible to heat the binder coated sand with heated air that causes convection of the binder coated sand while convection of the binder coated sand in this way, and to uniformly heat the binder coated sand. Is what you can do. Then, the binder coated sand 3 thus uniformly preheated is filled in the mold 2, and steam is blown into the mold 2 to heat the binder to remove the binder in the binder coated sand 3. It can be rapidly solidified or cured.

It is a front view showing the whole composition of an example of the mold manufacturing device concerning the present invention. It is a side view showing the whole example composition of the above-mentioned device. It is a figure which shows the block provided with the storage tank and sand supply head of the above-mentioned apparatus, (a) is a top view, (b) is a side view. It is sectional drawing which shows the part of the storage tank in the apparatus same as the above. It is a figure which shows the part of the storage tank in the above-mentioned apparatus, (a) is a front view, (b) is a bottom view. It is a side view of the part of the storage tank in the above-mentioned device. It is a figure which shows the convection cylinder in the apparatus same as the above, (a) is a front sectional view, (b) is a top view. It is a figure which shows the shield in the apparatus same as the above, Comprising: (a) is front sectional drawing, (b) is a top view, (c) is a bottom view. It is a figure which shows the gas introduction body in the apparatus same as the above, (a) is a front sectional view, (b) is a top view, (c) is a bottom view. The plate body which comprises the filter body in the device same as the above is shown, (a) is a bottom view of a plate body, (b) is sectional drawing, (c) is a bottom view of another plate body, (d) is FIG. The plate body which comprises the filter body in the device same as the above is shown, (a) is a bottom view of a plate body, (b) is sectional drawing, (c) is a bottom view of another plate body, (d) is FIG. It is a figure which shows the filter body in the apparatus same as the above, Comprising: (a) is an exploded sectional view, (b) is sectional drawing, (c) is a partially expanded sectional view. It is a figure which shows the block provided with the mold of the apparatus same as the above, (a) is a front view, (b) is a side view, (c) is a top view. It is a front view of a block provided with a steam supply head of the above-mentioned device. It is a figure which shows the block provided with the steam supply head of the above-mentioned apparatus, (a) is a top view, (b) is a side view. Fig. 3 is a perspective view showing a molding die as described above, in which (a) is a perspective view showing a state where the molding die is separated, and (b) is a sectional view showing a state where the molding die is clamped. 3A and 3B show the same sand supply head, in which FIG. 1A is a sectional view, FIG. 2B is an enlarged sectional view of a nozzle opening portion, and FIG. 3C is an enlarged plan view of a nozzle opening portion. It is sectional drawing which shows the state which supplies a binder coated sand from a storage tank same as the above to a sand supply head. It is sectional drawing which shows the state which inject | pours binder binding sand into a shaping die from the sand supply head same as the above. It is an expanded sectional view of the steam supply head same as the above. The figure shows the forward and backward state of the steam supply head, and (a), (b) and (c) are schematic front sectional views, respectively. 3A and 3B show the relationship between the steam supply head, the sand supply head, and the molding die, wherein FIG. 1A is a sectional view, and FIG. is there. (A) is a schematic bottom view of another embodiment of the steam supply head, and (b) is a plan view of another embodiment of the molding die.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 shows an overall configuration of an example of a mold manufacturing apparatus according to the present invention. This mold manufacturing apparatus mainly includes a block including a mold 2 for molding a mold, and a binder coated sand 3 on the mold 2. And a sand supply head 4 and a block including a steam supply head 5 for supplying steam to the mold 2.

  First, a block including the storage tank 10 and the sand supply head 4 will be described. FIG. 4 and FIG. 5 show the storage tank 10, and the storage tank 10 is formed in a hopper shape in which the upper surface is open and the lower portion is such that the inner diameter becomes smaller toward the lower side. In addition, a sand discharge port 205 formed in a cylindrical shape such as a cylinder is provided at the lower end of the storage tank 10 so as to project downward. A convection cylinder 202 and a shield 218 are attached in the storage tank 10.

  As shown in FIG. 7, the convection tube 202 is formed into a tubular shape such as a cylinder that opens vertically, and the inner diameter of the convection tube 202 is substantially the same as the inner diameter of the sand discharge port 205 of the storage tank 10. It is formed to the dimensions. Further, the convection cylinder 202 is formed with a plurality of sand inflow holes 204, which are open inward and outward, at a plurality of locations (three locations in the illustrated embodiment) at equal intervals around the circumference. Each sand inflow hole 204 is formed in a vertically long slot shape extending from the lower end of the convection cylinder 202 to the vicinity of the upper end. A mounting piece 230 is fixed to the outer peripheral surface of the convection cylinder 202 so as to project outward at a position between the sand inflow holes 204.

  A receiving piece 231 is fixed to the inner periphery of the lower portion of the storage tank 10 so as to project inward, and a screw rod 232 is provided upright on the upper surface of the receiving piece 231. The receiving piece 231 and the screw rod 232 are provided at a plurality of locations corresponding to the mounting piece 230 of the convection tube 202. Then, the convection tube 202 is arranged in the storage tank 10, and the through hole 233 formed in the attachment piece 230 of the convection tube 202 and opened vertically is inserted into the screw rod 232 from the upper end, and the pair of nuts screwed into the screw rod 232. By tightening the mounting piece 230 from above and below with 234, the convection tube 202 is mounted in the storage tank 10 as shown in FIG. The convection tube 202 is attached at a position where the lower end opening of the convection tube 202 faces and matches the upper end opening of the sand discharge port 205, and the lower end opening of the convection tube 202 is close to the upper end opening of the sand discharge port 205. The mounting height is set like this. Here, the mounting height of the convection tube 202 can be adjusted and changed by changing the position of the nut 234 screwed to the screw rod 232 in the vertical direction to adjust the tightening position of the mounting piece 230.

  As shown in FIG. 8, the shield 218 is formed in a conical (conical truncated cone) umbrella shape, and has a circular through hole 236 that opens vertically in the central portion. Since the shield 218 is thus conical, the lower surface of the shield 218 is formed as an inclined guide surface 219 that inclines downward from the central portion to the outer peripheral portion. Receiving bosses 237 project from a plurality of positions on the upper surface of the shield 218, and screw holes 238 are recessed in the upper surface of the receiving boss 237. Further, a cylindrical guide cylinder 239 is arranged below the shield 218, and the guide cylinder 239 is radially provided between the outer peripheral surface of the guide cylinder 239 and the inner peripheral surface of the shield 218 by the guide cylinder 239. 239 is supported by the shield 218. The guide cylinder 239 is located immediately below the through hole 236, and the inner diameter of the guide cylinder 239 is the same as or slightly larger than the inner diameter of the through hole 236.

  As shown in FIGS. 4 to 6, the shield 218 is arranged and attached in the storage tank 10 at a position directly above the convection cylinder 202. That is, the lower end of the hanging screw rod 241 is screwed into the screw hole 238 of each receiving boss 237 of the shield 218. A support base 242 is attached to the center of the opening at the upper end of the storage tank 10 as shown in FIG. 5, and the hanging screw rod 241 is passed through the support base 242 from the lower side to the screw rod 241. The suspension screw rod 241 is fixed to the support base 242 by screwing the nut 243. In this way, the shield 216 can be suspended and supported on the support base 242 by the suspension screw rod 241. The diameter of the shield 218 is formed to be larger than the diameter of the convection cylinder 202. By disposing the shield 218 directly above the convection cylinder 202 with a gap, as shown in FIG. The opening can be covered with the shield 218. The mounting height of the shield 216 can be adjusted by adjusting the vertical position at which the nut 243 is screwed to the screw rod 241, and the distance of the gap between the shield 218 and the convection cylinder 202 is adjusted. Is what you can do.

  A cylinder stand 244 is provided on the support base 242 as shown in FIGS. 5 and 6, and an opening / closing cylinder 245 formed of an air cylinder or the like is attached to the cylinder stand 244 in a downward position. An opening / closing tool 211 is attached to the rod 245a of the opening / closing tool cylinder 245. The opening / closing tool 211 is formed by including a connecting rod 246 and an opening / closing plug 247 attached to the lower end of the connecting rod 246. Then, as shown in FIG. 4, the connecting rod 246 is connected to the rod 255 a of the opening / closing cylinder 255 via the rod fitting 248 so that the connecting rod 246 is arranged at the center of the convection cylinder 202 through the through hole 236 of the shield 218 and the guide cylinder 239. The upper ends of rods 246 are joined and attached. The opening / closing plug 247 at the lower end of the opening / closing tool 211 is arranged at the sand discharge port 205 of the storage tank 10, and the opening / closing tool 211 is moved up and down by operating the opening / closing cylinder 245 to project and retract the rod 245a. It can be done.

  The gas supply device 201 that supplies the heated gas to the storage tank 10 is connected to the storage tank 10 via the gas introduction body 215. As shown in FIG. 9, the gas introduction body 215 includes a gas passage tube 213 formed in a cylindrical shape such as a cylinder shape that opens vertically and a similar sand passage tube 214 having a smaller diameter than the gas passage tube 213. The gas passage cylinder 213 is formed concentrically and is fixed to the lower plate 251 having the through hole 250 at the center by welding or the like to close the opening of the lower surface of the gas passage cylinder 213. At the same time, the lower end of the sand passage cylinder 214 is inserted into the through hole 250 and fixed to the lower plate 251. An upper plate 252 larger than the lower plate 251 is attached to the upper end of the gas passage cylinder 213 by welding or the like, and an opening window 253 slightly smaller than the inner diameter of the gas passage cylinder 213 is formed in the upper plate 252. There is. The upper surface of the gas passage cylinder 213 is opened by the opening window 253, and is surrounded by the inner circumference of the gas passage cylinder 213, the outer circumference of the sand passage cylinder 214, and the lower plate 251, and the upper surface is opened by the opening window 253. The gas passage chamber 216 is formed. The gas passage tube 213 is provided with a ventilation connection pipe 254 so as to project outward, and the inside of the gas passage chamber 216 is communicated with the connection port 212 on the inner circumference of the gas connection pipe 254. A tubular socket 257 is further attached to the gas passage tube 213. A fitting recess 255 having a width wider than the diameter of the gas passage cylinder 213 is formed on the upper surface of the upper plate 252 from one side end of the upper plate 252 to the other side end thereof. Further, a ring-shaped spacer 256 having the same thickness as the thickness of the upper plate 252 in the fitting recess 255 is attached to the upper end of the sand passage cylinder 214, and the sand passage cylinder 214 is open vertically in communication.

  A heat exchanger 220 composed of a spiral pipe is attached to the outer periphery of the sand passage cylinder 214, and the sand passage cylinder 214 can be cooled by passing a refrigerant such as water from the refrigerant pipe 260 to the heat exchanger 220. I am doing it. The refrigerant pipe 260 is introduced into the gas passage chamber 216 through the socket 257 in an airtight manner, and is connected to both ends of the heat exchanger 220.

  The gas introduction body 215 is attached to the support beam 37 as shown in FIGS. That is, the support plate 262 is fixed on the support beam 37, and the gas introduction body 215 is fixed on the support plate 262. Then, as shown in FIG. 5A, a pair of push-up cylinders 263 are attached to the support beam 37 below the support plate 262 in an upward posture. A branch bar 264 is attached to the rod 263a of the push-up cylinder 263 as shown in FIG. 3, and push-up bars 265 are attached to both ends of the branch bar 264 so as to project upward. Each of the four push-up rods 265 has a base portion formed as a large diameter portion 265a and a tip portion formed as a small diameter portion 265b. The diameter portion 265b is projected upward. Further, as shown in FIGS. 9B and 9C, insertion holes 267 are formed at four positions at the end portion of the upper plate 252 of the gas introduction body 215, and the small diameter portion of the push-up rod 265 is formed. 265b is inserted through the insertion hole 267 so as to be vertically slidable.

  On the other hand, a flange 268 projecting outward is provided on the outer periphery of the lower end of the sand discharge port 205 of the storage tank 10 described above, and a small diameter of the push-up rod 265 inserted through the insertion hole 267 of the upper plate 252 of the gas introduction body 215. The flange 268 is coupled and fixed to the upper end of the portion 265b. Therefore, the storage tank 10 is arranged and mounted above the support beam 37 while being supported by the four push-up rods 265. When the push-up cylinder 263 is operated and the rod 263a is vertically projected and retracted, the four push-up rods 265 are vertically moved through the branch bar 264, and accordingly the storage tank 10 is vertically moved. With this vertical movement of the storage tank 10, the lower end of the sand discharge port 205 of the storage tank 10 and the upper surface of the gas introduction body 215 can be brought close to or separated from each other.

  A filter body 206 is interposed between the lower end of the sand discharge port 205 of the storage tank 10 and the upper surface of the gas introduction body 215. The filter body 206 is formed by vertically stacking a plate body 207 and a filter net 208. In the illustrated embodiment, four plate bodies 207 and two filter nets 208 are stacked to form the filter body 207. It is formed. That is, as the plate body 207, four plates shown in FIGS. 10 (a), (b) and 11 (a) (b) are used, and one set of the plates shown in FIGS. 10 (a), (b) is used. 11A and 11B are used as a set.

  The plate body 207a shown in FIGS. 10A and 10B has a circular recess 270 formed in the lower surface of a square plate, a fitting hole 271 in the center, and a large number of concentric circles surrounding the fitting hole 271. The pores 210a are formed in the recesses 270. The plate body 207b shown in FIGS. 10C and 10D is provided with a circular convex portion 270 on the upper surface of a square plate, a sand passage hole 209a in the center, and a plurality of concentric circles surrounding the sand passage hole 209a. The vent hole 210b is formed at the location of the protrusion 271. The vent hole 210a of the plate body 207a and the vent hole 210b of the plate body 207b are formed to have the same size and the same arrangement, and the fitting ring 273 is formed on the upper surface surrounding the sand passage hole 209a of the plate body 207b. Is projected.

  Further, the filter net 208 is formed by a mesh of mesh which does not allow particles of the binder coated sand to pass through. The filter net 208a sandwiched between the plates 207a and 207b is formed in a circular shape having an outer diameter substantially the same as the inner diameter of the recess 270 as shown in FIG. An opening 274 having an inner diameter substantially equal to the diameter is formed.

  Then, as shown in FIG. 12A, a filter net 208a is arranged between the plate bodies 207a and 207b, and the plate nets 207a and 207b are overlapped to sandwich the filter net 208a between the plate bodies 207a and 207b. You can Here, the diameter and depth of the concave portion 270 of the plate body 207a are formed to be substantially the same as the diameter and height of the convex portion 270 of the plate body 207b, and the plate body 207a and the plate body 207b are inside the concave portion 270. The protrusions 272 are overlapped with each other so as to fit in, and the filter net 208a is sandwiched in close contact with the recesses 270 and the protrusions 272. At this time, the fitting ring 273 of the plate body 207b is fitted into the inner circumference of the fitting hole 271 of the plate body 207a through the opening 274 of the filter net 208a, and the vent holes 210a of the plate body 207a and the plate The vent holes 210b of the body 207b are vertically aligned. As described above, the ventilation holes 210a of the plate body 207a and the ventilation holes 210b of the plate body 207b are vertically aligned and communicate with each other, but a space between the ventilation holes 210a and the ventilation holes 210b is as shown in FIG. The net 208a is interposed.

  A plate body 207c shown in FIGS. 11A and 11B is formed by forming a fitting hole 275 in the center of a square plate and providing a large number of ventilation holes 210c that surround the fitting hole 275 in a plurality of rows concentrically. is there. A plate body 207d shown in FIGS. 11C and 11D is formed by forming a sand passage hole 209b in the center of a square plate and providing a plurality of ventilation holes 210d that surround the sand passage hole 209b in a plurality of concentric circles. is there. The vent hole 210c of the plate body 207c and the vent hole 210d of the plate body 207d are formed to have the same size and the same arrangement, and the fitting ring 276 is provided on the upper surface surrounding the sand passage hole 209b of the plate body 207d. Is projected. Further, an opening 277 having an inner diameter substantially equal to the outer diameter of the fitting ring 276 is formed in the filter net 208b sandwiched between the plate bodies 207c and 207d.

  Then, as shown in FIG. 12A, the filter net 208b is arranged between the plate bodies 207c and 207d, and the plate nets 207c and 207d are overlapped to sandwich the filter net 208b between the plate bodies 207c and 207d. You can At this time, the fitting ring 276 of the plate body 207d is fitted into the inner periphery of the fitting hole 275 of the plate body 207c through the opening 277 of the filter net 208b, and each vent hole 210c of the plate body 207c and the plate. The vent holes 210d of the body 207d are adapted to be vertically aligned. As described above, the ventilation holes 210c of the plate body 207c and the ventilation holes 210d of the plate body 207d are vertically in communication with each other, but the ventilation holes 210c are arranged between the ventilation holes 210d as shown in FIG. 12C. A filter network 208b is interposed between the two.

  As described above, the filter net 208a is sandwiched between the plates 207a and 207b, the filter net 208b is sandwiched between the plates 207c and 207d, and the plates 207a and 207b are placed on the upper side and the plates 207c and 207d are placed on the upper side. The filter body 206 can be assembled by disposing the filter body 206 on the lower side and stacking the filter body 206 vertically as shown in FIG. In this filter body 206, the sand passage holes 209a and 209b provided in the centers of the plate bodies 207a and 207c are in close contact and communicate with each other in the vertical direction, and the ventilation holes 210a to 210d provided in the plate bodies 207a to 207d are filter nets. The upper and lower parts are in close contact with each other via 208a and 208b. Note that the plate bodies 207a and 207b and the plate bodies 207c and 207d may be detachably connected by metal fittings or the like so as not to fall apart.

  The filter body 206 formed as described above is used by being arranged between the lower end of the sand discharge port 205 of the storage tank 10 and the upper end of the gas introduction body 215, as shown in FIGS. 4 to 6. It is a thing. That is, when the push-up cylinder 263 is operated to lower the rod 263a so as to be immersed in the push-up cylinder 263 as described above, the four push-up rods 265 are moved downward via the branch bar 264 and the storage tank 10 The filter body 206 can be attached by sandwiching the filter body 206 between the sand discharge port 205 of the storage tank 10 and the gas introduction body 215. Here, the filter body 206 is attached with the lower end fitted and positioned in the fitting recess 255 of the upper plate 251 of the gas introduction body 215.

  When the filter body 206 is attached between the sand discharge port 205 of the storage tank 10 and the gas introduction body 215 in this way, as shown in FIG. 4, the opening at the lower end of the sand discharge port 205 of the storage tank 10 is the filter body 206. The opening window 253 on the upper surface of the gas passage chamber 216 of the gas introduction body 215 is closed on the lower surface of the filter body 206. Further, the upper end opening of the sand passage cylinder 214 at the center of the gas introduction body 215 is in close contact with the lower end opening of the filter body 206 via the spacer 256.

  Further, the large number of ventilation holes 201 of the filter body 206 are all located in the opening at the lower end of the sand discharge port 205 of the storage tank 10. It is arranged evenly inside. Further, all the many ventilation holes 201 of the filter body 206 are located in the openings on the upper surface of the gas passage chamber 216 of the gas introduction body 215, and the openings of the lower surfaces of the many ventilation holes 201 are on the upper surface of this gas passage chamber 216. It is arranged evenly within the opening.

  Further, a sand discharge cylinder 281 is connected to the lower end of the sand passage cylinder 214 of the gas introduction body 215. The sand discharge cylinder 281 is formed of an upper cylinder 281a, a middle cylinder 281b, and a lower cylinder 281c. As shown in FIG. 2, the middle cylinder 281b and the lower cylinder 281c are attached to the support beam 37 in a vertically connected state. In addition, the lower cylinder 281c is projected below the support beam 37. The upper cylinder 281a has its upper end connected and fixed to the lower end of the sand passage cylinder 214, and the lower part of the upper cylinder 281a is inserted into the middle cylinder 281b. A discharge port 282 as shown in FIG. 5B is formed on the lower end surface of the sand discharge cylinder 281. The discharge port 282 is opened and closed by a sand shutter 283.

  The sand shutter 283 is provided with a shutter hole 283a as shown in FIG. 5B, and is arranged in contact with the lower surface of the discharge port 282 of the sand discharge cylinder 281. The sand shutter 283 is fixed to the tip of the cylinder rod 284 a of the shutter opening / closing cylinder 284, and the shutter opening / closing cylinder 284 is attached to the support beam 37. The sand shutter 283 is reciprocally moved back and forth by a shutter opening / closing cylinder 284. When the sand shutter 283 is moved forward and the shutter hole 283a of the sand shutter 283 coincides with the discharge port 282, the discharge port 282 is opened. Further, in this state, by moving the sand shutter 283 backward by the shutter opening / closing cylinder 284, the discharge port 282 can be closed by the sand shutter 283. In the normal state, the discharge port 282 is closed by the sand shutter 283.

  Further, the gas supply device 201 is connected to the connection port 212 of the gas introduction body 215, and the heating gas is supplied from the gas supply device 201 to the gas passage chamber 216 of the gas introduction body 215. Air is generally used as the heating gas, but any gas such as nitrogen gas can be used. In the embodiment of FIG. 5 (a), a dehumidifier 221 is built in, a dehumidifier 221 that sucks air in the atmosphere to dehumidify, a heating device such as a heater and a blower device such as a fan are incorporated, and The gas supply device 201 is formed by a heating blower 222 that heats and sends out the dehumidified air that has flowed in from. It is desirable that the dehumidifier 221 has a dehumidifying ability capable of removing about 99.9% of water, and by using such dehumidified gas as the heating gas, the heating gas is stored as described later. It is possible to prevent the stored binder in the coated sand from being moistened when the binder is supplied into the tank 10. In particular, when the binder of the binder coated sand is a saccharide or the like, it is possible to prevent the binder from sticking due to the action of water. The heating temperature of the gas by the heating blower 222 is not particularly limited, but when the binder of the binder coated sand is a thermosetting resin, it is set lower than the temperature at which the binder does not cure. There is a need to.

  The storage tank 10 stores the binder coated sand used for manufacturing the mold. Examples of the binder coated sand include silica sand, mountain sand, alumina sand, olivine sand, chromite sand, zircon sand, mullite sand, and others. What is formed by coating the surface with a solid binder can be used. As the binder, it is common to use a thermosetting resin such as a phenol resin or a furan resin, but in addition to the thermosetting resin, a saccharide, a water-soluble inorganic compound, a water-soluble thermoplastic resin, etc. It can also be used.

  When heating the binder coated sand stored in the storage tank 10, first, the gas supply device 201 is operated to supply the heated gas by blowing it from the connection port 212 into the gas passage chamber 216 of the gas passage introducing member 215. . The heated gas that has flowed into the gas passage chamber 216 passes through the ventilation holes 210 of the filter body 206 through the opening window 253 on the upper surface and is blown into the storage tank 10 through the sand discharge port 205 at the lower end.

  At this time, the opening / closing tool 211 is pushed down by the operation of moving the rod 245a of the opening / closing cylinder 245 downward, and the opening at the upper end of the sand passage hole 209 of the filter body 206 is closed by the opening / closing plug 247 at the lower end. There is. Further, the ventilation hole 210 of the filter body 206 is closed by a filter mesh 208 sandwiched between the plate bodies 207 as shown in FIG. Therefore, the binder coated sand in the storage tank 10 does not flow out through the ventilation holes 210 of the filter body 206, and the heated gas passes through the filter net 208, so that the inside of the storage tank 10 passes through the ventilation holes 210. Is blown into.

  When the heated gas is blown upward from the sand discharge port 205 at the lower end into the storage tank 10 in this way, the binder coated sand in the storage tank 10 is blown upward by the heated gas. Further, since the opening at the lower end of the convection tube 202 faces immediately above the opening at the upper end of the sand discharge port 205, the heated gas is blown upward into the convection tube 202, and the convection tube is blown. The binder coated sand in 202 is blown up with heated gas. The binder coated sand blown up in the convection tube 202 is blown out by overflowing to the outside of the convection tube 202 as shown by the chain line arrow in FIG. It In addition, the binder coated sand that overflows the upper end of the convection tube 202 and goes out of the convection tube 202 in this way flows into the convection tube 202 through the sand inflow hole 204 as indicated by the chain line arrow in FIG. 4.

  In this way, by blowing up the binder coated sand in the convection cylinder 202 with the heated gas, the binder coated sand overflows from the overflow port 203 at the upper end to the outside of the convection cylinder 202 and to the outside of the convection cylinder 202. The sticking agent coated sand that has come out returns to the inside of the convection tube 202 from the sand inflow hole 204, and allows the binding agent coated sand in the storage tank 10 to be convected between the inside and outside of the convection tube 202. Is. Therefore, it is possible to convect the binder-coated sand with the heated gas in the storage tank 10 and heat the binder-coated sand with large agitation, and to uniformly heat the binder-coated sand in the storage tank 10. It is a thing. The mounting height of the convection tube 202 is adjusted along the screw rod 232, and a gap is formed between the lower end of the convection tube 202 and the upper end of the sand discharge port 205. The outer binder coated sand can be made to flow into the convection cylinder 202, but if this gap is too large, the binder coated sand blown up by the heated gas flows backward from this gap to the outside of the convection cylinder 202. There is a risk of this being undesirable.

  Here, when the binder coated sand in the convection cylinder 202 is blown up by the heated gas, if the binder coated sand is blown up vigorously, it may be scattered to the outside of the storage tank 10. In particular, small sand grains and the binder that has peeled off from the binder coated sand are easily blown off. Therefore, the shield 218 is arranged above the overflow port 203 at the upper end of the convection cylinder 202, and the scattering of the binder coated sand is blocked by the shield 218 to prevent it. At this time, since the lower surface of the shield 218 is formed as an inclined guide surface 218 that inclines downward from the central portion to the outer peripheral portion, when the blown-up binder coated sand hits the shield 218, the inclined guide of the lower surface is formed. The inclination of the surface 218 guides the binder coated sand to flow outside the convection tube 202. Therefore, the convection of the binder coated sand inside and outside the convection cylinder 202 can be smoothly performed by the shield 218.

  The binder-coated sand that has been preheated with stirring with the heated gas as described above is discharged from the storage tank 10 for the production of the mold, and is supplied to the sand supply head 4 described later. In discharging the binder coated sand from the storage tank 10, first, the supply of heating gas from the gas supply device 201 to the storage tank 10 is stopped, and the opening / closing cylinder 245 is operated to move the rod 245a upward, The opening at the upper end of the sand passage hole 209 is opened by pulling up the opening / closing tool 211 and separating the opening / closing plug 247 from the sand passage hole 209 of the filter body 206. When the opening at the upper end of the sand passage hole 209 is opened in this way, the binder coated sand in the storage tank 10 flows out from the sand passage hole 209 to the sand discharge pipe 281 through the sand passage pipe 214 of the gas introduction body 215. .

  As described above, the binder coated sand is temporarily retained in the sand passage hole 209, the sand passage tube 214, and the sand discharge tube 281. However, the sand passage tube 214 of the gas introduction body 215 is provided in the gas passage chamber. Since it is surrounded by 216, the heat of the heated gas acts, and the sand passage cylinder 214 may become hot. When the binder of the binder coated sand is a thermosetting resin, if the temperature of the sand passage cylinder 214 is high, the binder may be attached to the inner periphery of the sand passage cylinder 214 by fusing. . Therefore, the sand passage cylinder 214 is provided with a heat exchanger 220 for passing a refrigerant, and the heat exchanger 220 cools the sand passage cylinder 214 to suppress the temperature rise.

  After the opening / closing plug 247 of the opening / closing tool 211 is pulled up to open the sand passage hole 209 of the filter body 206 as described above, the shutter opening / closing cylinder 284 is operated and the sand shutter 283 is moved forward to move the shutter hole 283a into the sand discharge tube 281. The discharge port 282 is opened by matching with the discharge port 282 of. By opening the discharge port 282 in this way, the binder coated sand in the storage tank 10 is discharged from the sand discharge port 205, the sand passage hole 209, the sand passage pipe 214, and the sand discharge pipe 281 to the sand supply head. 4 is supplied. When the binder coated sand in the storage tank 10 is discharged, the opening / closing cylinder 245 is actuated to close the upper end opening of the sand passage hole 209 of the filter body 206 with the opening / closing plug 247 of the opening / closing tool 211, and further the shutter opening / closing cylinder. 284 operates and the sand shutter 283 closes the discharge port 282 of the sand discharge cylinder 281.

  Here, as shown in FIG. 4, a sand detection sensor 217 formed by a level sensor or the like is detachably provided on the side wall of the storage tank 10. The sand detection sensor 217 is provided at a position facing one sand inflow hole 204 provided in the convection tube 202, and the height of the upper surface of the binder coated sand stored in the convection tube 202 is set to the sand inflow hole. This is detected through 204. In the embodiment shown in FIGS. 4 and 6, the sand detection sensor 217 is provided in the upper part and the lower part, and the sand detection sensors 217a and 217b can be attached to the upper part and the lower part, respectively. The sand detection sensor 217c can be attached to the. The height of the upper surface of the binder coated sand is detected by the sand detection sensor 217 while the blowing of the heated gas from the gas supply device 201 into the storage tank 10 is stopped.

  For example, the following control can be performed using the sand detection sensor 217. After discharging the binder coated sand in the storage tank 10 as described above, the opening / closing cylinder 245 is operated and the opening / closing plug 247 of the opening / closing tool 211 closes the upper end opening of the sand passage hole 209 of the filter body 206. After that, new binder-coated sand is supplied from the opening on the upper surface into the storage tank 10. When the binder-coated sand is supplied into the storage tank 10, the binder-coated sand in the storage tank 10 is supplied. Since the height of the upper surface of the sand gradually rises, the fact that the upper surface of the binder coated sand reaches the height of one of the sand detection sensors 217 selected from the plurality of sand detection sensors 217a, 217b, 217c, When the sand detection sensor 217 detects the sand, the supply of the binder coated sand to the storage tank 10 is stopped. Therefore, the amount of the binder coated sand supplied to the storage tank 10 can be controlled by its height to supply a predetermined fixed amount of the binder coated sand to the storage tank 10. Further, the amount of the binder coated sand supplied into the storage tank 10 can be changed depending on which height of the plurality of sand detection sensors 217a, 217b, 217c is selected. Then, after this, the supply of the heated gas from the gas supply device 201 to the storage tank 10 is restarted, and the binder-coated sand newly supplied into the storage tank 10 is heated.

  As described above, the height of the upper surface of the binder coated sand in the storage tank 10 is detected by the sand detection sensor 217, and the amount of the binder coated sand supplied to the storage tank 10 is controlled to a constant amount. In addition, a certain amount of the binder coated sand can be discharged from the storage tank 10 after heating. Here, in the embodiment of FIGS. 4 and 6, a plurality of upper and lower sand detection sensors 217 are attached to the storage tank 10, and one of the plurality of sand detection sensors 217 is selectively used to store the sand. Although the height of the upper surface of the binder coated sand in the tank 10 is detected, only the sand detection sensor 217 at the position corresponding to the amount of the binder coated sand supplied in the storage tank 10 is used. You may make it attach to the storage tank 10.

  As described above, when the heated gas is blown from the gas supply device 201 through the ventilation holes 210 of the filter body 206 into the storage tank 10 to heat the binder coated sand, the ventilation holes 210 of the filter body 206 are filled with the filter mesh 208. The binder coated sand in the storage tank 10 does not pass through the ventilation holes 210 of the filter body 206 to come out. However, the mesh of the filter net 208 is gradually clogged with the fine powder of the binder coated sand, the fine powder of the binder of the binder coated sand, and the like, and the efficiency with which the heated gas passes through the ventilation holes 210 is improved. become worse. Therefore, it is necessary to clean or replace the filter net 208 regularly or irregularly. In order to clean and replace the filter net 208, the push-up cylinder 263 is operated to move the rod 263a upward, and the storage tank 10 is pushed up. When the storage tank 10 is pushed up in this way, the lower end of the sand discharge port 205 of the storage tank 10 separates from the upper surface of the filter body 206, so that the filter body 206 can be taken out from between the storage tank 10 and the gas introduction body 215. Thus, with the filter body 206 taken out, the filter net 208 can be easily removed from between the plate bodies 207 to clean or replace the filter net 208. As shown in FIG. 12, the vent hole 210a of the plate body 207a at the upper end of the filter body 206 is opened so as to widen upward. By forming the opening of the ventilation hole 210 at the upper end of the filter body 206 in this way, a fine powder of the binder coated sand or a fine powder of the binder is formed between the inner periphery of the ventilation hole 210 and the upper surface of the filter net 208. It is difficult for powder to adhere.

  On the other hand, the support beam 37 that supports the storage tank 10 has one end joined and fixed between the upper ends of the pair of columns 36, as shown in FIGS. A guide member 38 that is long in the horizontal direction is attached to the lower side of the support beam 37, and one end of the guide member 38 extends beyond the support beam 37 and projects. Rails 40 are horizontally provided on the outer surfaces of the side pieces 39 on both sides of the guide member 38 along the lower ends thereof.

  Reference numeral 42 is a dolly, and wheels 43 provided in pairs at upper ends on both sides thereof are mounted on the rail 40. Floating prevention wheels 43a are provided below the wheels 43 so as to face each other via the rails 40. Reference numeral 44 is a sub-carriage, and wheels 45 provided in pairs at the upper ends on both sides thereof are mounted on the rail 40. A pair of cylinder devices 46 and 47 are horizontally attached to the lower side of the sub-carriage 44, and the cylinder devices 46 and 47 are attached in opposite directions so that the cylinder rods 46a and 47a come in and out in opposite directions. There is. The tip end of the cylinder rod 46a of the one cylinder device 46 is fixed to a fixing plate 48 hanging from one end of the guide member 39, and the tip end of the cylinder rod 47a of the other cylinder device 47 is connected to the carriage 42. It is fixed to the plate 49. Therefore, when each cylinder device 46, 47 is operated to move the cylinder rods 46a, 47a in and out, the sub-carriage 44 moves along the rail 40, the cylinder devices 46, 47 move, and the carriage 42 moves. The carriage 42 can be moved along the rail 40, and the carriage 42 can be moved with a stroke twice as long as the stroke of the cylinder rods 46a, 47a of the cylinder devices 46, 47. The cylinder devices 46 and 47 form a sand supply horizontal drive device 11 for horizontally moving the sand supply head 4 provided on the carriage 42 as described later.

  The cylinder device 52 is attached downward to the lower side of the carriage 42 with the rear end of the cylinder device 52 fixed, and the lower plate 53 is attached to the lower end of the cylinder 52a of the cylinder device 52. The sand supply head 4 is fixed to the lower end of a cylinder rod 52b that moves in and out from the lower end of the cylinder device 52, and the sand supply head 4 is arranged. The sand supply head 4 is vertically movable by passing the slide rod 54 provided upwardly on the sand supply head 4 through the guide sleeve 55 provided on the lower plate 53 so as to be vertically slidable. The sand supply head 4 can be moved up and down by operating the cylinder device 52 to move the cylinder rod 52b in and out. The vertical drive device 6 for moving the sand supply head 4 up and down by the cylinder device 52 is It is what is formed.

  As shown in FIG. 17A, the sand supply head 4 is formed by providing a nozzle opening 8 at a lower end and a cylindrical sand introducing cylinder 57 having an upper end surface opened as an opening 57a at an upper portion so as to project upward. I am doing it. The sand introducing cylinder 57 is inserted through an opening 58 provided in the lower plate 53 and an opening 59 provided in the carriage 42 (see FIG. 2), and can be moved up and down together with the sand supply head 4.

  In FIG. 17A, reference numeral 60 denotes a cooling plate provided at the lower end of the sand supply head 4 so that it can be cooled by passing water. The lower end of the sand supply head 4 comes into contact with the heated mold 2, but the cooling plate 60 can prevent the heat of the mold 2 from being transferred to the binder coated sand 3 in the sand supply head 4. Is. A communication hole 60a that communicates with the inside of the sand supply head 4 is formed in the center of the cooling plate 60, and a nozzle mounting plate 61 is mounted on the lower surface of the cooling plate 60 at the location of the communication hole 60a. The nozzle mounting plate 61 is formed with a nozzle mounting port 61a communicating with the communication hole 60a, and the nozzle cylinder 62 is mounted on the nozzle mounting port 61a.

  The nozzle cylinder 62 is formed in a cylindrical shape as shown in FIG. 17B, and the opening on the lower surface of the nozzle cylinder 62 is closed by a flange bottom piece 63. A nozzle opening 8 is formed at the center of the flange bottom piece 63, and the nozzle opening 8 communicates with the inside of the sand supply head 4 through the nozzle mounting opening 61a and the communication hole 60a. A baffle 64 is attached inside the nozzle cylinder 62. The baffle plate 64 is formed in a disc shape, and spacer pieces 64a are provided at a plurality of positions on the outer periphery at equal intervals so as to project with the same protruding size as shown in FIG. 17 (c). The baffle plate 64 is fixed at a position apart from the flange bottom piece 63 in a state where the spacer protrusion 64a is in contact with the inner circumference of the nozzle cylinder 62, and the inside of the nozzle cylinder 62 is vertically moved by the baffle plate 64. It is a partition. A narrow gap 65 is formed between the outer periphery of the baffle plate 64 and the inner periphery of the nozzle cylinder 62 by the spacer protrusion 64a, and the upper side and the lower side of the baffle plate 64 are communicated with each other through this gap 65.

  The binder coated sand 3 in the sand supply head 4 passes through the communication hole 60a of the cooling plate 60, the nozzle mounting opening 61a of the nozzle mounting plate 61, and the nozzle cylinder 62 and is discharged from the nozzle opening 8. A baffle plate 64 is provided at 62, and since the binder coated sand 3 cannot easily pass through the narrow gap 65, the binder coated sand 3 cannot be discharged from the nozzle port 8 only by its own weight. . In particular, since a narrow communication hole 60a is provided between the sand supply head 4 and the baffle plate 64, the weight of all the binder coated sand 3 in the sand supply head 4 acts on the baffle plate 64. Therefore, the binder coated sand 3 is not discharged from the nozzle port 8 in a normal state. On the other hand, as will be described later, by introducing air into the sand supply head 4 to make the inside of the sand supply head 4 higher than the outside air pressure, the binder coated sand 3 in the sand supply head 4 is compressed by the air pressure. Is pressed to forcefully pass through the gap 65 of the baffle plate 64, and the binder coated sand 3 can be discharged from the nozzle port 9 as shown by the arrow in FIG.

  The storage tank 10 is provided at one end of the support beam 37, and the holding cylinder device 67 is provided at the other end. By horizontally moving the carriage 42 by the sand supply horizontal drive device 11 formed by the cylinder devices 46 and 47 as described above, the sand supply head 4 provided on the carriage 42 is moved to a position directly below the storage tank 10 and a holding cylinder. It can be reciprocated between positions directly below the device 67.

  The presser cylinder device 67 is attached downward, and a presser cylinder 72 is attached to the tip of a cylinder rod 67a protruding downward from the presser cylinder device 67. As shown in FIG. 19, the holding cylinder 72 is formed as a bottomed cylinder whose lower surface is open and whose upper surface is closed, and a net 73 is stretched over the opening 72a on the lower surface. A packing 74 is provided on the outer peripheral edge of the opening 7 on the lower surface of the holding cylinder 72. The air pipe 13 is connected to the side surface of the holding cylinder 72, and high-pressure air is supplied from the air pipe 13 into the holding cylinder 72 and is jetted from the opening 72a on the lower surface of the holding cylinder 72 through the net 73. ing. The pressing cylinder device 67 and the pressing cylinder 72 form the sand supply head pressing device 12.

  Next, the configuration of the block including the molding die 2 will be described with reference to FIG. In FIG. 13, reference numeral 20 is a base, and a reversing drive mechanism portion 21 is provided at the upper end of the rising portion 20a at one end portion. The inversion drive mechanism section 21 is formed of a lower rack mechanism section 21a having a rack (not shown) built therein and an upper pinion mechanism section 21b having a pinion (not shown) meshing with the rack incorporated therein. The pinion mechanism portion 21b is integrally provided on the central portion of the elongated rack mechanism portion 21a. The rack in the rack mechanism portion 21a is linearly reciprocally driven in the longitudinal direction by the cylinder mechanism. When the rack is linearly driven in this manner, the pinion in the pinion mechanism portion 21b that meshes with the rack rotates. It is designed to be driven. The fixed side rotation shaft 22 is provided so as to pass through the pinion portion 21b, and the above pinion is fixed to the outer periphery of the fixed side rotation shaft 22. A fixed-side template 23 is attached to the tip of the fixed-side rotation shaft 22.

  A pair of reversal support wheels 25 is provided on the other end of the base 20, and a reversal support disk 26 is disposed between the pair of reversal support wheels 25. A plurality of connecting rods 27 are mounted between the inversion support disk 26 and the fixed-side template 23, and the inversion support disk 26 is connected and fixed to the fixed-side template 23 via the connection rod 27. In this state, it is supported on the pair of reversing support wheels 25. A sleeve 29 provided on a movable side template 28 is slidably fitted on each of the connecting rods 27, and the movable side template 28 is attached so as to be slidable along the connecting rod 27. . A mold opening / closing cylinder device 30 is attached to the outer center of the reversing support disk 26, and a cylinder rod 30a of the cylinder device 30 projects inward through the reversing support disk 26. The tip of the cylinder rod 30a is connected to the movable mold plate 28 via a connecting member 31. Therefore, by driving the cylinder device 30 to move the cylinder rod 30a in and out, the movable side template 28 is slid along the connecting rod 27, and the movable side template 28 is moved to the fixed side template 23 described above. It can be moved forward and backward in the direction of approaching and moving away from.

  As shown in FIG. 16A, the molding die 2 is composed of a fixed side die 2a and a movable side die 2b. The die 2a is attached to the fixed side die plate 23, and the die 2b is attached to the movable side die plate 28. is there. Molding recesses 33a and 33b are provided on the opposing surfaces of the molds 2a and 2b, respectively. Then, by operating the cylinder device 30 as described above and advancing the movable side mold plate 28 to bring the movable side mold plate 28 close to the fixed side mold plate 23, the molds 2a and 2b can be aligned and the mold die 2 can be clamped. When the molding die 2 is clamped, a cavity 33 is formed in the molding die 2 in the recesses 33a and 33b as shown in FIG. 16B, and the cavity 33 communicates with the cavity 33 and the upper surface of the molding die 2 is formed. The injection port 1 that opens at is formed. An air vent 34 that exhausts a gas containing water vapor from the cavity 33 is provided on at least one surface of the molds 2 a and 2 b. The air vent 34 is formed as a shallow groove through which a gas such as water vapor passes but the binder coated sand 3 does not pass. Further, the molds 2a and 2b have an electric heating blower or the like built therein so that the mold 2 can be heated. Since the present invention does not heat the binder coated sand 3 with the heat of the mold 2 to mold the mold, the heating temperature of the mold 2 is such that the temperature of the steam blown into the mold 2 does not decrease. Relatively low temperature is sufficient. When the mold 2 is replaced to change the mold to be molded, it is only necessary to reattach the other molds 2a and 2b to the fixed mold plate 23 and the movable mold plate 28. The replacement can be performed easily and in a short time.

  Here, as described above, when the rack in the rack mechanism section 21a of the reversing drive mechanism section 21 is driven to drive the pinion in the pinion mechanism section 21b to rotate, the fixed side rotation shaft 22 rotates together with this pinion. To do. The fixed-side mold plate 23 is attached to the fixed-side rotating shaft 22, and the reversal support disk 26 and the movable-side mold plate 28 on the reversal support wheel 25 are connected to the fixed-side mold plate 23 via a connecting rod 27. ing. Therefore, when the reversal drive mechanism 21 is operated to rotate the fixed-side rotation shaft 22, the reversal support disk 26 rotates together with the fixed-side mold plate 23 so as to roll on the reversal support wheel 25. At the same time, the movable mold plate 28 also rotates. Along with this, the molding die 2 composed of the dies 2a and 2b attached to the fixed side mold plate 23 and the movable side mold plate 28 also rotates. Then, the mold 2 clamped is filled with the binder coated sand 3 in the cavity 33 with the inlet 1 facing upward, and the mold 2 is rotated at an angle of 180 degrees in this way. When the casting mold 1 is moved and turned upside down so that the injection port 1 of the molding die 2 faces downward, of the binder coated sand 3 in the cavity 33, the unsolidified binder coated sand 3 is discharged from the injection port 1. Is what you can do.

  Next, a block including the water vapor supply head 5 will be described with reference to FIGS. 14 and 15. Reference numeral 77 is a base, and support plates 78 are erected at both end portions of the upper surface on the side closer to one end portion, and car 79 is provided at a plurality of positions at the same height inside each support plate 78. In addition to being mounted, the lower vehicle 80 is attached to the lower side of each upper vehicle 79. A gate-shaped rear support 81 is erected on the other end of the base 77.

  Reference numeral 83 is a slide frame body formed by connecting the rear ends of the frame pieces 84 on both sides with a crosspiece 85, and the upper ends of the frame pieces 84 on both sides are pointed in an inverted V shape over the entire length. A rail plate 86 is attached. A holding frame plate 87 is attached so as to extend between the upper surfaces of the front ends of the frame pieces 84 on both sides. Elevating guide pins 88 are vertically movably inserted in two places at both end portions of the holding frame plate 87, and are attached to an elevating plate 89 arranged below the holding frame plate 87. The lower end of is fixed. The elevating plate 89 is formed to have a size larger than the opening 87a in the frame of the holding frame plate 87. The elevating guide pin 88 is elastically urged in the upward pulling direction by a spring 90 provided on the outer periphery thereof, and the elevating plate 89 is pulled upward by the force of the spring 90 and abuts against the lower surface of the holding frame plate 87. (See FIG. 22A).

  The water vapor supply head 5 is attached to the lower side of the lift plate 89. The water vapor supply head 5 is formed in a rectangular plate shape, and has a nozzle port 9 at the center of the lower surface. As shown in FIG. 20, the steam supply head 5 is provided with a steam passage 102 that opens to the rear end and the upper and lower surfaces. A nozzle cylinder 103 is inserted from above into a vertical hole portion of the vapor passage 102 that opens at the top and bottom. The nozzle cylinder 103 is formed in a cylindrical shape having an upper surface closed and a lower surface opened, and an opening 103 a formed on a side surface is opened in the steam passage 102. Therefore, the inside of the nozzle cylinder 103 communicates with the steam passage 102 through the opening 103a, and the nozzle opening 9 is formed by the lower end opening protruding from the lower surface of the steam head 5 of the nozzle cylinder 103. A steam supply hose 91 is connected to the opening of the steam passage 102 at the rear end of the steam supply head 5, and the steam supplied to the steam supply head 5 through the steam supply hose 91 is ejected from the nozzle port 9 as shown by an arrow. It has become so.

  In this way, the slide frame 83 to which the holding frame plate 87 having the elevating plate 89 and the steam supply head 5 on the lower surface is attached has the rail plates 86 on both side ends of the slide frame body 83 and the supporting plates 78 on both sides of the base 77. It is arranged on the base 77 in a state of being supported between the support plates 78 by being inserted between the lower vehicle 80 and the lower vehicle 80. Since the rail plates 86 at both ends of the slide frame 83 are inserted between the upper vehicle 79 and the lower vehicle 80, the rail frame 86 rotates the upper vehicle 79 and the lower vehicle 80 to run, and thus the slide frame 83 Can be slid back and forth, and the water vapor supply head 5 can be moved in the front and back direction by sliding the slide frame 83.

  Between the holding frame plate 87 attached to the slide frame 83 and the rear support 81 of the base 77, the horizontal drive device 7 including a pair of horizontally arranged cylinder devices 92 and 93 is provided. The cylinder devices 92 and 93 are vertically stacked so that the cylinder rods 92a and 93a come in and go out in opposite directions, and the traveling wheels 94 provided on both sides of the lower end of the lower cylinder device 93 are used. It is placed and arranged on the rail 95 on the upper surface of the base 77. The tip of the cylinder rod 92a of the one cylinder device 92 is fixed to the rear fixing plate 96 that hangs on the rear support 81, and the tip of the cylinder rod 93a of the other cylinder device 93 is the rear end of the holding frame plate 87. It is fixed to a front fixing plate 97 which is erected on

  Therefore, when the cylinder devices 92, 93 are operated to move the cylinder rods 92a, 34a in and out, the traveling wheels 94 travel on the rail plate 95 so that the cylinder devices 92, 93 move, and at the same time, the upper vehicle 79 and the lower vehicle By rotating the slide frame 83 while rotating 80, the holding frame plate 87 can be moved along the rail plate 85, and the stroke of moving the cylinder rods 92a, 93a of the cylinder devices 92, 93 is twice the stroke. With this stroke, the water vapor supply head 5 provided on the holding frame plate 87 can be moved forward and backward.

  Here, in a state where the cylinder rods 92a, 93a of the pair of cylinder devices 92, 93 are retracted, the water vapor supply head 5 is in the most retracted position, and the water vapor supply head 5 is moved to the most retracted position as shown in FIG. It is located between the support plates 78. Further, in a state in which the cylinder rods 92a, 93a of the cylinder devices 92, 93 are projected, the water vapor supply head 5 is at the most advanced position, and the water vapor supply head 5 is mounted on the base 77 as shown in FIG. It is jumping forward. By projecting only one of the pair of cylinder devices 92, 93, for example, the cylinder rod 92a of the cylinder device 92, the water vapor supply head 5 can be positioned in the middle between the most retracted position and the most advanced position. The steam supply head 5 is arranged at the front end of the base 77 as shown in FIG. 21 (b).

  By combining the block including the storage tank 10 and the sand supply head 4, the block including the molding die 2, and the block including the steam supply head 5 as shown in FIG. 1, the mold manufacturing apparatus according to the present invention is formed. Is what you can do. That is, the support beam 37 of this block is arranged above the molding die 2 by erecting the column 36 of the block including the storage tank 10 and the sand supply head 4 on the side of the base 20 of the block including the molding die 2. The opening / closing direction of the molding die 2 and the horizontal movement direction of the sand supply head 4 intersect at a right angle. In addition, a block base 77 having the steam supply head 5 is installed behind the stationary mold 2a of the molding mold 2, and the mold opening / closing direction of the molding mold 2 and the horizontal movement direction of the steam supply head 5 are downward and upward. So that they match. In addition, reference numeral 105 in the drawing denotes a tank of an air compressor that supplies high-pressure air to each of the above-described cylinder devices and air pipes.

  When manufacturing a mold with the mold manufacturing apparatus according to the present invention, one cycle of molding the mold starts by supplying the binder coated sand 3 from the storage tank 10 to the sand supply head 4. That is, by operating the cylinder devices 46 and 47 constituting the sand supply horizontal drive device 11 to retract the cylinder rods 46a and 47a, the sand supply head 4 is shown in FIG. 2 by the solid line at the left end of the guide member 38. As shown by the chain line, the position is set back to the position directly below the storage tank 10. When the sand supply head 4 is moved to a position directly below the storage tank 10 in this way, the shutter opening / closing cylinder 284 is actuated, the discharge port 282 of the sand discharge cylinder 281 below the storage tank 10 is opened, and storage in the storage tank 10 is performed. The binding agent coated sand 3 being discharged is discharged. Since the sand supply head 4 is located directly below the discharge cylinder 281 of the storage tank 10 as shown in FIG. 18, the binder heated sand 3 preheated in the storage tank 10 as described above is the sand supply head 4. Supplied within.

  After supplying the binder coated sand 3 into the sand supply head 4 in this manner, the cylinder devices 46 and 47 constituting the sand supply horizontal drive device 11 are operated to project the respective cylinder rods 46a and 47a. The sand supply head 4 is advanced from the position directly below the storage tank 10 to the left end of the guide member 38 as indicated by the solid line in FIG.

  At this time, the mold clamping of the molding die 2 is performed in synchronization with the forward movement of the sand supply head 4. That is, as shown in FIGS. 13 (a) and 13 (b), the mold opening / closing cylinder device 30 operates and the cylinder rod 30a protrudes from the state where the fixed and movable molds 2a and 2b of the mold 2 are opened. The mold 2b on the movable side can be moved so as to be close to the mold 2a on the fixed side, and the mold can be clamped as shown in FIG. 16 (b). Then, when the mold clamping of the molding die 2 is completed, the sand supply head 4 also completes the movement of the guide member 38 to the left end as shown by the solid line in FIG. 2, and the sand supply head 4 is directly above the clamped molding die 2. Is located in.

  At the same time when the mold 2 is clamped, the steam supply head 5 advances. That is, when the molding die 2 is opened and the sand supply head 4 is retracted to the position directly below the storage tank 10, both cylinder rods 92a, 93a of the cylinder devices 92, 93 constituting the horizontal drive device 7 are formed. Is retracted, and the water vapor supply head 5 is at the most retracted position as shown in FIG. 21A, but only one of the cylinder devices 92, 93 is operated, and the cylinder of this cylinder device 92 is operated. The water vapor supply head 5 can be moved forward by the protrusion of the rod 92a. Since only one cylinder device 92 is operated, the water vapor supply head 5 is located at an intermediate position between FIGS. 21 (a) and 21 (c) as shown in FIG. 21 (b). This intermediate position is not directly above the molding die 2 or immediately below the sand supply head 4, but is a position where the steam supply head 5 is close to the molding die 2, and the steam supply head 5 is made to wait at this intermediate position. I am doing it.

  After the sand supply head 4 is moved to a position directly above the mold 2 that has been clamped as described above, the cylinder device 52 that constitutes the vertical drive device 6 is actuated to project the cylinder rod 52b downward, The feeding head 4 is lowered. When the sand supply head 4 located directly above the molding die 2 descends, the nozzle opening 8 at the lower end of the sand supply head 4 is brought into close contact with the injection opening 1 on the upper surface of the molding die 2 as shown in FIG. At the same time, the pressing cylinder device 67 is also operated so that the cylinder rod 67a projects downward, and the pressing cylinder 72 attached to the lower end of the cylinder rod 67a is pressed against the upper end of the sand introducing cylinder 57 of the sand supply head 4. Has become. When the pressing cylinder 72 is pressed against the upper end of the sand introducing cylinder 57 of the sand supply head 4 in this way, the packing 74 is brought into close contact with the opening 57a of the sand introducing cylinder 57 and the opening 72a of the pressing cylinder 72 in an airtight communication. To do. Then, in this state, high-pressure air is supplied from the air pipe 13 into the holding cylinder 72, whereby the high-pressure air flows into the sand introducing cylinder 57 as shown by the arrow in FIG. 19 and the inside of the sand supply head 4 is pressurized. Then, the binder coated sand 3 stored in the sand supply head 4 is discharged through the nozzle port 8 as shown by the arrow in (b) of FIG. To be injected into.

  As described above, the binder coated sand 3 is blown from the sand supply head 4 into the molding die 2 by the pressure of air, and the binder coated sand 3 is injected into the molding die 2 in a short time. In addition, the binder coated sand 3 can be filled in the cavity 33 of the molding die 2 without causing defective filling. The air flowing into the cavity 33 together with the binder coated sand 3 is exhausted from the air vent 34.

  When the binder coated sand 3 is injected and filled into the molding die 2 from the sand supply head 4 as described above, the supply of high-pressure air from the air pipe 13 is stopped, and the cylinder device constituting the vertical drive device 6 is stopped. 52 is operated so that the cylinder rod 52b retracts, and the holding cylinder device 67 is operated so that the cylinder rod 67a retracts, and the sand supply head 4 is raised. The sand supply head 4 is lifted at a position directly above the molding die 2.

  Next, by operating only one of the cylinder devices 92, 93 constituting the horizontal drive device 7 and causing the cylinder rod 93a of this cylinder device 93 to project, the steam supply head 5 is moved to the position shown in FIG. The water vapor supply head 5 is inserted between the molding die 2 and the sand supply head 4 by further advancing from the standby position of b), and the water vapor supply head 5 is directly above the molding die 2 and sanded as shown in FIG. It is located directly below the supply head 4. Here, although the water vapor supply head 5 is held below the holding frame plate 87 attached to the slide frame 83, when the water vapor supply head 5 is advanced as shown in FIG. As shown in (a), the water vapor supply head 5 is positioned directly below the sand supply head 4 through the opening 87 a of the holding frame plate 87.

  In this state, the cylinder device 52 that constitutes the vertical drive device 6 is operated to cause the cylinder rod 52b to project downward, thereby lowering the sand supply head 4. At this time, the pressing cylinder device 67 may also be operated at the same time so that the cylinder rod 67a is projected downward to press the sand supply head 4 downward by the pressing cylinder 72. Then, when the sand supply head 4 descends in this way, as shown in FIG. 22B, the sand supply head 4 passes through the opening 87a of the holding frame plate 87 and comes into contact with the upper surface of the elevating plate 89, so that the elevating plate 89 89 is pressed downward by the sand supply head 4. The elevating plate 89 is vertically movable while being elastically urged upward by the spring 90. Therefore, when the sand supplying head 4 presses the elevating plate 89, the elevating plate 89 moves downward while compressing the spring 90. The water vapor supply head 5 provided on the lower surface side of the plate 89 also descends. Then, as the water vapor supply head 5 descends in this manner, the nozzle port 9 of the water vapor supply head 5 is brought into close contact with the injection port 1 of the molding die 2 as shown in FIG. The water vapor supplied to the water vapor supply head 5 is blown into the cavity 33 of the molding die 2 from the nozzle port 9 through the injection port 1 as shown by the arrow in FIG. The steam blown into the cavity 33 passes through the binder coated sand 3 and is then exhausted from the air vent 34.

  Here, in order to bring the nozzle port 9 of the water vapor supply head 5 into close contact with the injection port 1 of the molding die 2 so that water vapor does not leak, the sand supply head 4 is lowered by the vertical drive device 6 as described above, The steam supply head 5 is pushed down by the supply head 4. Therefore, the vertical drive device 6 for raising and lowering the sand supply head 4 can be used as it is to press the steam supply head 5 and bring the nozzle port 9 into close contact with the inlet 1. This eliminates the need to separately install a dedicated cylinder device for pushing down.

  Further, the steam is constantly supplied to the steam supply head 5 from the steam supply hose 91, and the steam is constantly ejected from the nozzle port 9 except when the steam is blown into the molding die 2. For this reason, when the molding die 2 is open, the steam supply head 5 is retracted to a position distant from the molding die 2 as shown in FIG. However, when steam is blown into the mold 2 after the mold 2 is filled with the binder coated sand 3, if the steam supply head 5 is advanced to a position directly above the mold 2 from a position far from the mold 2, a long distance is obtained. The time required to advance the mold increases the molding cycle of the mold. Therefore, when the mold 2 is clamped and the binder coated sand 3 is injected from the sand supply head 4 into the mold 2, the steam supply head 5 is brought close to the mold 2 as shown in FIG. After advancing to the standby position and injecting the binder coated sand 3 into the molding die 2 from the standby position close to the molding die 2, as shown in FIG. It is possible to advance to the position just above 2, so that the molding cycle of the mold can be shortened.

  As described above, when steam is blown into the mold 2 filled with the binder coated sand 3, the steam comes into contact with the surface of the binder coated sand 3 so that the latent heat of the steam is changed to the binder coated sand. However, since steam has a high latent heat, the temperature of the binder coated sand 3 rapidly rises to around 100 ° C. due to the latent heat transferred when the steam is condensed. As described above, the time during which the binder coated sand 3 is heated to around 100 ° C. by the latent heat transfer of the steam is the temperature of the steam, the flow rate of the steam blown into the mold 2, the binder coated inside the mold 2. Although it varies depending on the filling amount of the sand 3, etc., it is usually a short time of about 3 to 30 seconds. The steam blown into the molding die 2 through the inlet 1 heats the binder coated sand 3 in the molding die 2 and then is exhausted from the air vent 34.

  As described above, the latent heat of condensation of the steam blown into the mold 2 can rapidly raise the temperature of the binder coated sand 3, and the condensed water generated in the mold 2 by the condensation of the steam. Is vaporized by heating with steam subsequently blown into the mold 2, so that the temperature inside the mold 2 rapidly rises to near the temperature of steam, and the binder coated sand 3 is heated at this temperature. Is what you can do.

  When the binder of the binder coated sand 3 is a thermosetting resin, the binder coated sand 3 filled in the molding die 2 is heated by the latent heat of condensation of water vapor to obtain a temperature higher than the curing temperature of the thermosetting resin. When the temperature is raised to 1, the binder can be melted and hardened, and the mold can be molded with the refractory aggregate (sand) bonded with the binder.

  Further, when the binder of the binder coated sand 3 is a saccharide, a water-soluble inorganic compound, or a water-soluble thermoplastic resin, when the steam is started to be blown into the mold 2, the steam is coated with the binder as described above. Since the condensed water is generated by taking heat away from contacting with 3, the condensed water acts on the binder of the binder coated sand 3. When condensed water acts on the solid binder of the binder coated sand 3, when the binder is a saccharide, it absorbs the condensed water and swells or dissolves to gelatinize. Is a water-soluble inorganic compound or a water-soluble thermoplastic resin, it is dissolved in this condensed water to be a liquid and gelatinized, saccharides, a water-soluble inorganic compound, a binder consisting of a water-soluble thermoplastic resin are all It becomes a paste and becomes sticky. The adhesiveness of the binder causes the refractory aggregate of the binder coated sand 3 filled in the mold 2 to be bonded by the adhesiveness of the binder. Next, the binder coated sand 3 is heated by the latent heat of condensation of the steam that is subsequently blown into the mold 2, and the water acting on the binder is evaporated and dried, and the sugar, the water-soluble inorganic compound, A binder made of a water-soluble thermoplastic resin can be dried and solidified, and the refractory aggregate can be bonded by the solidified binder to form a mold.

  As described above, by supplying steam to the mold 2 to heat the binder coated sand 3, the binder coated sand 3 is instantaneously heated by the latent heat of condensation of the steam, and the binder is removed. The mold can be solidified or cured, and the mold can be stably manufactured in a short time without the need to heat the mold 2 to a high temperature in advance, and the productivity of the mold can be improved. It is possible. Further, even if a toxic gas is generated from the binder during heating, it can be absorbed by the condensed water of steam, and the pollution of the environment can be reduced.

  Here, saturated steam can be used as it is, but superheated steam is preferably used. Superheated steam is steam in a completely gaseous state in which saturated steam is further heated to a temperature equal to or higher than the boiling point, and is dry steam at 100 ° C. or higher. The superheated steam obtained by heating the saturated steam may be one that is expanded at a constant pressure without increasing the pressure, or may be pressurized steam that is increased in pressure without being expanded. The temperature of the superheated steam blown into the molding die 1 is not particularly limited, and since the temperature of the superheated steam can be raised to about 900 ° C, it is necessary to set the temperature as needed between 100 and 900 ° C. Good.

  In the embodiment shown in FIG. 20, saturated steam generated in the boiler 115 is heated by the superheater 14 to prepare superheated steam, and this superheated steam is supplied to the steam supply head 5 through the steam supply hose 91. .

  After steam is blown into the mold 2 as described above to mold the mold, the cylinder device 52 that constitutes the up-and-down drive device 6 is operated and the cylinder rod 52b is retracted to raise the sand supply head 4. Let When the sand supply head 4 rises in this way, the pressing of the elevation plate 89 by the sand supply head 4 is released, and the elevation plate 89 rises due to the elastic force of the spring 90. The water vapor supply head 5 provided on the lower surface side of the elevating plate 89 also rises and separates from the molding die 2 (see FIGS. 21C and 22A).

  Next, after the sand supply head 4 is lifted in this manner, the cylinder devices 46 and 47 constituting the sand supply horizontal drive device 11 are operated to retract the respective cylinder rods 46a and 47a, thereby directly above the molding die 2. From the position shown by the solid line at the left end of the guide member 38 in FIG. 2, which is the position, the sand supply head 4 is moved backward to the position directly below the storage tank 10 as shown by the chain line in FIG.

  As described above, when the sand supply head 4 moves away from the position directly above the mold 2, the upper surface of the mold 2 can be cleaned. That is, as shown in FIG. 2, a scraping plate supporting member 111 is attached to a side portion of the sand supplying head 4 opposite to the sand supplying horizontal driving device 11, and one end of the scraping plate 110 is vertically moved to the scraping plate supporting member 111. It is freely pivotally attached. A cylinder device 112 is attached to the scraping plate support 111, and the lower end of a cylinder rod 112a thereof is pivotally attached to the scraping plate 110. The cylinder rod 112a of the cylinder device 112 is normally retracted upward, and the scraping plate 110 is horizontally rotated upward and pulled up as shown by a solid line in FIG. Then, when the sand supply head 4 moves away from the position directly above the molding die 2, the cylinder device 112 operates to cause the cylinder rod 112a to protrude downward, and the scraping plate 110 to rotate downward to move to the position shown in FIG. It can be hung down as shown by the chain line, and the binder coated sand 3 adhered to the upper surface of the mold 2 at the lower end of the scraping plate 110 can be scraped off and cleaned as the sand supply head 4 moves. is there. Before the sand supply head 4 moves from directly below the storage tank 10 to above the molding die 2, the scraping plate 110 is horizontally rotated upward and pulled up.

  When the sand supply head 4 moves to a position directly below the storage tank 10 as shown by the chain line in FIG. 2, the sand shutter 71 opens as described above, and the binder heated sand 3 preheated in the storage tank 10 is supplied by the sand. It is supplied to the head 4 and prepared for the next molding (see FIG. 18A). As described above, the sand supply head 4 moves to the molding die 2 after receiving the supply of the binder coated sand 3 from the storage tank 10 and injects the binder coated sand 3 into the molding die 2. Therefore, it is sufficient that the sand supply head 4 is formed to have a size for storing one time of the binder coated sand 3 injected into the molding die 2. Therefore, the size of the sand supply head 4 can be reduced.

  Further, as described above, at the same time that the sand supply head 4 moves backward, the steam supply head 5 also moves backward. That is, the cylinder devices 92, 93 constituting the horizontal drive device 7 are actuated, the cylinder rod 93a and the cylinder rod 92a are retracted, and the water vapor supply head 5 moves to the most retracted position (see FIG. 21 (a)). ), To prepare for the next molding.

  Next, the mold 2 is opened. That is, the mold opening / closing siridander device 30 is actuated, and the cylinder rod 30a is retracted to move the movable mold 2b away from the fixed mold 2a to open the molding mold 2 to mold the molded mold. Can be taken out from the cavity 33 of the molding die 2.

  Thus, when the molding die 2 is opened and the dies 2a and 2b are separated from each other, the inner surface of each of the dies 2a and 2b can be cleaned by the air duster 107. That is, as shown in FIG. 1, the air duster 107 is formed by providing air nozzles 107a, 107a on both sides. The air duster 107 is provided at the tip of the cylinder rod 108a of the cylinder device 108, and the cylinder device 108 is fixed to the side portion of the support beam 37 above the molding die 2. Then, the mold 2 is opened, the molded mold is released from the mold 2, and when the cylinder device 108 is operated, the cylinder rod 108a projects downward and the air duster 107 moves downward and opens. The air duster 107 is inserted between the molds 2a and 2b. At this time, high pressure air is jetted from the air nozzles 107a, 107a of the air duster 107 to the inner surfaces of the molds 2a, 2b, so that the inner surfaces of the molds 2a, 2b can be cleaned. After ejecting high pressure air from the air nozzles 107a, 107a, the cylinder rod 108a is retracted and the air duster 107 is pulled up to its original position.

  FIG. 23 shows another embodiment of the present invention. In the above-mentioned embodiment, the molding die 2 is provided with one injection port 1 on the upper surface, but when molding a large mold, a mold having a particularly large planar area is molded. In this case, if there is only one injection port 1, steam will be blown into the molding die 2 from one injection port 1, so that the steam can be evenly distributed throughout the molding die 2. Is difficult, and the binder coated sand 3 filled in the mold 2 may not be uniformly heated.

  Therefore, in such a case, it is preferable to use the one in which the injection ports 1 are provided at a plurality of positions on the upper surface of the molding die 2 as shown in FIG. Then, as the steam supply head 5 for supplying steam to the molding die 2 having the injection ports 1 provided at a plurality of such places, the one shown in FIG. 23 (a) having the nozzle ports 9 corresponding to the injection ports 1 is used. Can be used.

  The water vapor supply head 5 is formed by providing a water vapor pipe 120 connected to a water vapor supply hose 91 on the head body 5a. The water vapor supply pipe 120 is provided with a plurality of branch pipes 121 branched to the left and right, and a nozzle port 9 is provided at the tip of each branch pipe 121. The nozzle openings 9 are arranged so as to correspond to the injection openings 1 at a plurality of positions of the molding die 2. The water vapor head 5 thus formed is used by being attached to the lower side of the elevating plate 89 as in the case of FIG. 22 described above.

  When injecting water vapor into the molding die 2, the water vapor supply head 5 is lowered similarly to the above-described FIG. 22B, and the water vapor supply head 5 is inserted into the plurality of injection ports 1 on the upper surface of the molding die 2. Each nozzle port 9 can be matched. Therefore, steam is supplied from the nozzles 9 of the steam supply head 5 into the molding die 2 through all the injection ports 1. Therefore, the steam is blown into the molding die 2 from a plurality of injection ports 1 so that the steam can be evenly spread throughout the molding die 2. The binder filled in the molding die 1 The coated sand 3 can be heated uniformly and a homogeneous mold can be formed.

2 Mold 3 Binder Coated Sand 5 Water Vapor Supply Head 10 Storage Tank 201 Gas Supply Device 202 Convection Cylinder 203 Sand Overflow Port 204 Sand Inlet Hole 205 Sand Outlet 206 Filter Body 207 Plate 208 Filter Net 209 Sand Through Hole 201 Through Pore 211 Opening / closing tool 212 Connection port 213 Gas passage cylinder 214 Sand passage cylinder 215 Gas introduction body 216 Gas passage chamber 217 Sand detection sensor 218 Shielding body 219 Inclined guide surface 220 Heat exchanger 221 Dehumidifier 222 Heating blower

Claims (11)

A storage tank for storing the binder coated sand prepared by coating a refractory with a binder, a mold for molding a mold filled with the binder coated sand discharged from the storage tank, and a binder. A mold manufacturing apparatus comprising a steam supply head for solidifying or curing the binder of the binder coated sand by heating with steam by blowing steam into a mold filled with the agent coated sand, The convection tube is further provided with a gas supply device for supplying the heated gas so that the heated gas is blown upward from the lower part of the tank, and the convection tube formed in a tubular shape having an opening at the top and bottom is provided with the heating gas from the opening at the lower end. The binder coating in the convection cylinder is located in the reservoir at the position where the convection cylinder is blown, and the opening at the upper end of the convection cylinder is blown up by the heated gas blown into the convection cylinder. The sand sand is formed as an overflow port that overflows to the outside of the convection cylinder in the storage tank, and a sand inflow hole through which the binder coated sand on the outside of the convection cylinder flows into the convection cylinder is formed on the side surface of the convection cylinder. In addition , the sand discharge port is formed at the lower end of the storage tank, and the heating gas supplied from the gas supply device is blown into the storage tank through the sand discharge port. A mold manufacturing apparatus, wherein a part is arranged so as to face the sand discharge port . A filter body is provided so as to close the opening at the lower end of the sand discharge port, and the filter body is formed by stacking a plate body and a filter net that allows gas to pass but does not allow the binder coated sand to pass therethrough. The plate body is provided with sand passage holes and ventilation holes, and the filter mesh is arranged in the ventilation holes avoiding the sand passage holes. The sand passage holes are coated with the binder in the storage tank. The sand serves as a passage when discharged from the sand discharge port, and the ventilation hole serves as a passage when the heated gas supplied from the gas supply device is blown into the storage tank. The mold manufacturing apparatus according to claim 1 . The filter body is formed by stacking a plurality of plate bodies and a filter net sandwiched between the plate bodies, and the sand passage hole and the ventilation hole of each plate body are arranged at the same position in a vertically stacked state. The mold manufacturing apparatus according to claim 2 , wherein the mold manufacturing apparatus is provided as follows. The mold manufacturing apparatus according to claim 2 or 3 , further comprising an opening / closing tool that is vertically movable in the storage tank and that opens and closes an opening at an upper end of the sand passage hole of the filter body by vertically moving. A gas introduction body formed by arranging a sand passage cylinder inside a gas passage cylinder having a connection port connected to a gas supply device is provided, and a gas passage chamber formed between the gas passage cylinder and the sand passage cylinder is provided. The gas introduction body is arranged below the filter body such that the ventilation hole of the filter body is located on the upper surface and the opening at the upper end of the sand passage cylinder matches the opening at the lower end of the sand passage hole of the filter body. The mold manufacturing apparatus according to any one of claims 2 to 4 , wherein: The filter body is sandwiched between the lower surface of the sand discharge port of the storage tank and the upper surface of the gas introduction body, and at least one of the storage tank and the gas introduction body is formed so as to be positionally movable in the direction of vertically approaching and separating. The mold manufacturing apparatus according to claim 5 , wherein the mold manufacturing apparatus is provided. The storage tank is provided with a sand detection sensor for detecting the position of the upper surface of the binder coated sand in the convection tube at a position facing the sand inflow hole on the side surface of the convection tube. 6. The mold manufacturing apparatus according to any one of 6 . Disposed above the convection tube in the reservoir, according to claim 1 to 7, further comprising a shield covering the overflow port of the upper end of the convection tube through the gap Nebayuizai coated sand passes The mold manufacturing apparatus according to any one of claims. The mold manufacturing apparatus according to claim 8 , wherein the shield has a lower surface formed as an inclined guide surface that inclines downward from the central portion to the outer peripheral portion. The mold manufacturing apparatus according to any one of claims 5 to 9 , wherein a heat exchanger for passing a refrigerant is provided in the sand passage cylinder of the gas introduction body. The mold according to any one of claims 1 to 10 , wherein the gas supply device is provided with a dehumidifier for dehumidifying air and a heating blower for heating the dehumidified air and sending the heated air. Manufacturing equipment.

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