WO2022203135A1 - Dispositif de soupape à canal chaud de type à commande d'ouverture/de fermeture de pression d'injection - Google Patents

Dispositif de soupape à canal chaud de type à commande d'ouverture/de fermeture de pression d'injection Download PDF

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Publication number
WO2022203135A1
WO2022203135A1 PCT/KR2021/012120 KR2021012120W WO2022203135A1 WO 2022203135 A1 WO2022203135 A1 WO 2022203135A1 KR 2021012120 W KR2021012120 W KR 2021012120W WO 2022203135 A1 WO2022203135 A1 WO 2022203135A1
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WIPO (PCT)
Prior art keywords
resin
gate
pressure
runner
valve device
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PCT/KR2021/012120
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English (en)
Korean (ko)
Inventor
김혁중
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김혁중
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Publication date
Priority claimed from KR1020210118301A external-priority patent/KR102522069B1/ko
Application filed by 김혁중 filed Critical 김혁중
Publication of WO2022203135A1 publication Critical patent/WO2022203135A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor

Definitions

  • the present invention relates to an injection pressure opening/closing control type hot runner valve device, and more particularly, enabling the opening/closing operation of the gate by automatically controlling the lifting piston by the injection pressure and pressure balancing action of the injection cylinder. It relates to an injection pressure opening/closing control type hot runner valve device that can ensure stable and accurate gate opening/closing operation regardless of low resin pressure or low speed.
  • an injection molding machine for molding plastic products injects a resin raw material from a mold cylinder in which the resin is melted into the manifold, and the injected resin is evenly distributed along the resin flow path branched in the manifold and is coupled to the lower part of the manifold. It is a device that is supplied to one or more nozzles, respectively, and is injected into the molding space, that is, the cavity formed by the upper and lower cores, which are product molding molds.
  • This injection molding machine is configured to open and close the gate, that is, the outlet by the lifting operation of the valve pin.
  • a manifold type that receives resin through the manifold is used.
  • single type is used in case of single product production.
  • FIG. 1 is a cross-sectional view showing a hot runner valve device for an injection molding machine having a structure for elevating a valve pin by using air as an operating pressure according to the prior art, and includes a driving unit 100 and a valve device 200 .
  • the driving unit 100 has a plurality of air channels 110 and 120 that are conduits for supplying and discharging high-pressure air from the outside, and the plurality of air channels 110 and 120 are formed.
  • the piston 140 in the cylinder 130 is lifted up and down by the high-pressure air selectively introduced through the.
  • the lower end of the piston 130 has a structure in which the valve pin 210 is connected and interlocked.
  • the valve pin 210 has a structure that selectively blocks or opens a gate, ie, an outlet, which forms the front end of the nozzle 220 by being raised and lowered in conjunction with the piston 130 .
  • the valve device 200 includes a nozzle 220 on which a heater is wound to form an outer body to prevent solidification of the resin, and the valve pin 210 is vertically disposed inside the nozzle 220. It is a structure that is installed to achieve elevation.
  • the nozzle 220 has a resin channel 230 formed with a predetermined gap around the valve pin 210 , and both ends of the resin channel 230 are the outlet of the nozzle and the resin channel of the manifold 300 . It is a structure connected to each of the 310.
  • valve device for a multi-cavity mold injection molding machine having this configuration, when a high-pressure operating pressure is selectively supplied through the air channels 110 and 120, the piston 140 rises or falls, and at the same time, the valve pin 210 interlocks.
  • the lifting operation is performed integrally. Accordingly, as the piston 140 moves up and down, the outlet of the nozzle is opened or blocked, so that the resin supplied through the manifold 300 is supplied or blocked into the mold through the outlet.
  • the present applicant combined the supply action pressure of the resin supplied to the inside of the nozzle and the return element through Republic of Korea Patent Registration No. 10-1290549 to link the lifting operation to the lifting pin, and the lifting and lowering of the lifting pin
  • a driving means consisting of a hydraulic/pneumatic cylinder of a complicated structure, a forward/reverse motor or an actuator, etc.
  • a hot runner valve device for injection molding machines that can improve the degree of freedom of application and installation to molds through volume reduction.
  • the present applicant has proposed an improved hot runner valve device through Korean Patent No.
  • the runner valve device does not require a driving means of a complicated structure for opening and closing the gate of the nozzle, and can maintain good flowability of the resin as the opening and closing of the gate is interrupted by the runner pin. It is possible to create favorable molding conditions for resin as well.
  • the hot runner valve device according to the prior art is a small part and in the case of a molded product requiring precision, for example, in the case of a gear, the overall balance is very important, so it is ideal to supply resin at various points to the cavity, which is the molding space, and mold it.
  • the volume of the hot runner valve device there is a structural disadvantage that it is impossible to supply the resin at several points for a small molded product.
  • the hot runner valve device previously applied by the present applicant controls the resin supply to the cavity by using the solidification phenomenon of the resin.
  • the mass productivity of the molded product was lowered due to disadvantages such as the resin was not completely solidified and flowed down at the time when the supply had to be cut off, or the resin was not completely melted at the time of supplying the resin, so it was delayed.
  • the present invention is to solve the problems of the prior art, and an object according to an exemplary embodiment of the present invention is that when an injection pressure is generated in an injection cylinder, the lifting piston provided in the nozzle moves downward to temporarily open the gate locally. Then, by the injection pressure acting on the lower part of the lifting piston, the elastic force of the return spring is overcome and the gate is fully opened so that the resin is supplied to the cavity of the mold. As the pressure is balanced in the upper and lower spaces of the piston, the lifting piston moves down and down by the restoring force of the return spring naturally to close the gate, thereby ensuring stable and automated gate opening and closing operation. To provide a runner valve device.
  • An object of the present invention is to provide an injection pressure opening/closing control type hot runner valve device that does not require complicated parts for opening and closing the gate because of its configuration, and has a simple structure, which can increase the convenience and economical efficiency of maintenance.
  • the present invention forms a solidified region in which a small amount of resin can stay and solidify by cutting a part of the gate fin, which is the tip of the lifting piston in a state where the gate is blocked, and the solidified resin remaining in the solidified region is
  • An object of the present invention is to provide an injection pressure opening/closing control type hot runner valve device capable of improving the precision and reliability of operation by preventing the resin from flowing in a blocked state and allowing it to be easily removed when the injection pressure is applied.
  • an object according to another embodiment of the present invention is that in the case of a hot runner valve device applied to a multi-cavity mold, each valve device is controlled to open sequentially with a time difference in a state in which the valve devices are connected and installed at intervals in a single mold cavity, at this time
  • the valve device of one embodiment is configured to start supplying resin to the cavity first among several valve devices receiving resin from the injection cylinder, the valve device at the next position is temporarily lowered by the resin pressure of the injection cylinder therein.
  • the gate is locally opened and the gate is fully opened by rising by the resin pressure acting on the cavity side injected by the valve device of the above embodiment.
  • the object of the present invention is to provide a hot runner valve device that has a relatively simple structure and can stably implement sequence control for multi-cavity molds by shielding the gate as the lifting piston descends by the return spring as the resin pressure in the nozzle and the nozzle are balanced.
  • the first embodiment of the present invention for realizing the above object is a resin passage through which the molten resin passes to the inner center and a body in which an expansion space is formed by extending the resin passage, and the resin is provided inside the lower part of the body a nozzle composed of a runner cylinder having a runner part provided with an outlet through which resin is discharged while having a reduced diameter at a lower side of the nozzle to receive and guide;
  • a pressure acting part that is provided to be raised and lowered inside the runner cylinder and a lowering force is applied by the inflow pressure of the resin on the upper part, and a connection part and this connection part connected to the lower side of the pressure acting part to form a passage through which the resin passes, and this connection part elevating and lowering having a gate pin extending from the center of piston;
  • the upper end is caught on the upper side of the expansion space and the lower end is caught on the stepped jaw formed on one side of the runner cylinder, and the upper end of the pressure applying part is in contact with a
  • a second preferred embodiment of the present invention for realizing the above object is a body in which a resin passage through which the molten resin passes to the inner center and an expansion space formed by extending the resin passage are connected, and the upper end part inside the lower part of the body is connected and assembled, a nozzle comprising a runner cylinder comprising a runner part provided with an outlet for discharging the resin, the lower part of which is formed by reducing diameters on the upper and lower sides, respectively, and formed with stepped and locking jaws;
  • the runner cylinder is raised and lowered inside the runner cylinder, and the upper part has a pressure-acting part on which a descending force is applied by the inflow pressure of the resin, and the pressure-acting part is extended with a reduced diameter to the lower side so that the resin passes through the side and is discharged.
  • a discharge passage is formed, and the lower surface thereof extends with a reduced diameter from the center of the discharge portion and the discharge portion caught by the locking jaw when descending, is disposed on the runner portion, and the end portion opens and closes the gate by lifting and lowering displacement.
  • an elevating piston having a gate fin forming a rising chamber between the runner and the runner; The upper end is caught on the upper side of the expansion space and the lower end is caught on the stepped jaw, and a return spring that applies an elastic force in the downward direction when the lifting piston is raised by contacting the upper end of the pressure applying part. characterized by it.
  • the lifting piston has a pressure acting portion having an inclined surface for inducing the resin pressure to act by forming a descending chamber, which is a space in which the diameter decreases while proceeding downward; a tubular member connected with a reduced diameter at the lower portion of the pressure-acting part, and a connection part for forming one or a plurality of passages radially around a concentric circle to allow the resin of the descending chamber to move;
  • An ascending chamber is formed around it by extending long from the lower center of the connection part and being disposed on the runner part, and the end part is positioned to shield the gate of the mold module and selectively opened by the lifting operation when the resin pressure is applied
  • the runner cylinder is connected to the lower part of the body by screwing, and the inner diameter is formed to have a diameter corresponding to the expansion space, and the inner upper side reduces the diameter so that the lower end of the return spring is caught.
  • a tubular barrel part having a stepped step;
  • a runner part extending integrally to the lower part of the barrel and having a relatively reduced diameter to form a rising chamber that is a space between the gate pin and a runner part connected to one side of the gate of the mold module; have.
  • the nozzle is a tubular member penetrating up and down, and a resin passage is formed on the upper part to receive resin and flow, and the diameter of the resin furnace is expanded to the lower side of the resin furnace.
  • the gate fin has a size to shield the gate at the lower end and is composed of a runner tip having a vent hole formed between the gate and the gate in a direction perpendicular to the side.
  • the gate is opened and closed by elevating the lifting piston only with the resin pressure and the return spring of the injection cylinder without a separate driving source, so economical manufacturing and installation and maintenance convenience according to the simplification of the structure are excellent. That is, when the injection pressure is applied to the inside of the nozzle, the injection pressure is preferentially applied to the upper part of the lifting piston, which causes the gate to temporarily lower and at the same time to temporarily open the gate. As a result, the gate is closed by moving the lifting piston down by the elastic support force of the return spring due to the pressure balance inside the nozzle when the filling of the cavity is completed. There is an advantage in that the opening operation for the valve can be performed quickly and accurately by interlocking the injection pressure.
  • each valve device disposed in each cavity automatically opens and closes the gate by the pressure equalization action when the resin filling is completed, so the precision of the mold holding time or injection timing is It has a useful effect that can greatly increase the convenience and efficiency of injection operation because it enables stable and accurate resin supply, blocking, and holding pressure to the cavity of the entire mold without management, technology, or equipment.
  • FIG. 1 is a cross-sectional view showing a hot runner valve device according to the prior art
  • FIG. 2 is a cutaway perspective view showing the internal structure of the first embodiment of the present invention.
  • 5 to 7 are cross-sectional views for explaining the operation in the first embodiment
  • FIG 8 is an excerpted perspective view of the lifting piston according to the first embodiment
  • FIG. 13 is a cutaway perspective view showing the internal structure of a second embodiment of the present invention.
  • 15 to 17 are cross-sectional views for explaining the operation of the second embodiment
  • expansion space 13 housing 15: heater
  • stepped jaw 33 runner part 33a: locking jaw
  • connection part 53h connection part 53h: passage 54: discharge part
  • discharge passage 55 gate pins a, b: upper and lower spaces
  • FIGS. 1 to 12 an injection pressure opening/closing control type hot runner valve device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 12 .
  • the gate is automatically closed by pressure equalization even without precisely managing the holding pressure time of the mold.
  • the setting can prevent the occurrence of defects in the molded product.
  • FIG. 2 is a perspective view showing the internal structure of the present invention.
  • a resin passage 11b through which the molten resin passes is formed in the center of the drawing, and an expansion space 11a is formed by expanding the diameter below the resin furnace 11b, and the lower end thereof is a gate (g).
  • a nozzle 10 formed by a nozzle 10 having a body 11 connected to one side of the mold module m, and the nozzle 10 is assembled and integrally connected by screwing inside the nozzle 10, the inside of which is the expansion
  • a runner cylinder 30 connected to one side of the mold module m on which the gate g is formed by forming a flow path (unsigned) with a diameter corresponding to the space 11a, and the runner cylinder 30 It is provided in the inside of the and linked up and down by the action pressure of the resin.
  • the gate (g) of the mold module (m) is shielded, the gate (g) is temporarily lowered by the supply of the resin pressure, and the gate (g) is opened to equalize the internal pressure.
  • the lifting piston 50 moves upward, the cavity of the mold module (m) ( When the resin injection for c) is completed and pressure equilibrium occurs, the injection pressure opening/closing control type hot runner valve device ( 1) is shown.
  • FIG. 3 is an exploded perspective view of the injection pressure opening/closing control type hot runner valve device of the present invention viewed from the upper side
  • FIG. 4 is an exploded perspective view viewed from the lower side.
  • a tubular body 11 having a resin furnace 11b and an expansion space 11a formed therein as an outer body is provided to surround the outer surface of the body 11 to prevent the resin from solidifying
  • a nozzle 10 comprising a heater 15 and a housing 13 which is a cover element surrounding the outer surface of the heater 15, and the nozzle 10 is assembled by screwing on the lower side of the nozzle 10, and the resin is supplied to the lower side.
  • a tubular runner cylinder 30 with an empty interior to guide, and a slide contact with the inside of the runner cylinder to ascend and descend.
  • the elevating piston 50 which performs a lifting operation so that the gate pin 55 opens and closes the gate g of the mold module m, and the lowering elastic support force for the lifting piston installed inside the nozzle and moved upward
  • An injection pressure opening/closing control type hot runner valve device 1 composed of an acting return spring 20 is shown.
  • FIG. 5 is a longitudinal cross-sectional view showing the internal structure of the present invention.
  • a body 11 having a tubular shape that is penetrated up and down and has a hollow inside, and a resin furnace 11b is formed on the upper side of the inside, and an expansion space 11a that is relatively enlarged in diameter is formed on the lower side of the body 11 and a heater 15 provided to surround the outer surface of the body 11 and heating to prevent the resin from solidifying, and a housing 13 that is a cover element that surrounds the heater 15 so that the heater 15 is not exposed to the outside.
  • a runner cylinder 30 comprising a barrel part 31 having a stepped step 31a on which the lower end of the return spring 20 is caught, and a runner part 33 extending from the lower part of the barrel part 31 to have a reduced diameter.
  • runner cylinder 30 which is provided so as to be able to ascend and descend while in sliding contact with the interior of the runner cylinder 30, and is provided with a descending chamber (a) for generating descending force by resin pressure in the upper part, and the ascending force by the resin pressure in the lower part. It is provided with a rising chamber (b) for generating a rising chamber (b) and is connected to the lower side of the pressure acting portion 51 and the pressure acting portion 51 to form a passage 53h through which the resin is moved.
  • the connection part 53 and the connection part 53 are extended from the center of the lower part to form a rising chamber (b) between the runner part 33 and the end of the mold module (m) gate (g).
  • An injection pressure opening/closing control type hot runner valve device 1 composed of a lifting piston 50 made of a gate pin 55 to open and close is shown.
  • FIG. 6 is a longitudinal cross-sectional view for explaining the primary gate open state of the present invention.
  • the lifting piston 50 is displaced in the downward direction as the resin pressure acts on the pressure acting part 51 of the lifting piston 50 installed inside the nozzle 10, and , as shown in the drawing, the gate g is temporarily opened by protruding downward based on the gate g of the mold module m. That is, since the resin pressure acting on the lowering chamber (a) is large at the starting point at which the injection pressure of the injection cylinder acts, the configuration for moving the lifting piston 50 down is shown.
  • FIG. 7 is a longitudinal cross-sectional view for explaining the secondary gate open state.
  • the resin pressure acting on the descending chamber (a) following FIG. 6 is applied to the ascending chamber (b) through the passage (53h) formed in the runner cylinder (30) of the lifting piston (50).
  • the gate When (g) is temporarily opened, the amount of the resin pressure acting on the ascending chamber (b) is relatively large compared to the resin pressure acting on the descending chamber (a), so the lifting piston 50 moves upward to the gate.
  • (g) is shown the configuration to achieve a fully open state.
  • FIG. 8 is a perspective view showing an excerpt of the lifting piston of the present invention.
  • a plurality of passages (53h) radially centered on a concentric circle at the lower portion having a pressure acting portion 51 provided in a tubular shape on the upper portion and a diameter reduced to the lower side of the pressure applying portion 51 are penetrated.
  • a connecting portion 53 and a elevating piston ( 50) is shown.
  • FIGS. 5 to 7 are rendered images of FIGS. 5 to 7
  • FIG. 12 is a view for explaining a gate opening/closing operation of the present invention.
  • the injection pressure opening/closing control type hot runner valve device according to the present invention may be used in a multi-type valve device connected to a manifold so that it can be used in a multi-cavity mold, or it may be used as a single type used in a single cavity, Since this may be performed by a known technique, a detailed description thereof will be omitted.
  • the nozzle 10 is an element for receiving resin from the injection cylinder and guiding it to the cavity side of the mold. And it is composed of a housing 13 configured to surround the heater (15).
  • the body 11 is provided as a tubular member penetrating up and down, the upper part is opened to receive the resin in the molten state from the injection cylinder, and the inner center is the resin supplied by forming the resin furnace 11b. It provides a passage through which the resin furnace 11b moves, and the lower side of the resin furnace 11b is formed by extending the diameter with respect to the resin furnace 11b, and is an extended space that is a space in which the return spring 20 and the runner cylinder 30 are installed. (11a) is formed.
  • the heater 15 is provided to surround the outer surface of the body 11 and is an element that generates heat by receiving power from the outside, and by heating the resin flowing inside the body 11 to maintain a molten state, the resin It serves to prevent the solidification of
  • the housing 13 is a metal tube-shaped accommodation member that surrounds the heater 15 so as not to be exposed to the outside.
  • the nozzle 10 of this configuration may be implemented by a known technique, and its material or shape may be appropriately modified and implemented.
  • the runner cylinder 30 is integrally connected to the lower part of the body 11 and is a connecting pipe element for receiving the resin passing through the resin furnace 11b, and corresponds to the expansion space 11a of the body 11.
  • the ball part 31 is provided with an upper outer surface connected to the lower part of the body 11 constituting the nozzle 10 by screwing, and a space corresponding to the expansion space 11a of the body 11 inside. It is a tubular member in which a stepped jaw 31a is formed by reducing the diameter so that the lower end of the return spring 20 is caught on the inner upper side.
  • the runner part 33 is integrally provided under the barrel part 31 and has a relatively reduced diameter to form a rising chamber b in the space between the runner part and the gate fin 55, , a member whose lower end is connected to one side of the gate g of the mold module m.
  • the runner part 33 forms a locking jaw (unsigned) at the reduced diameter portion of the ball part 31, which restricts movement so that the lifting piston 50, which will be described later, does not descend any further. perform the role
  • the elevating piston 50 is an element that selectively shields the gate g of the mold module m by being elevatingly provided inside the runner cylinder 30, and this elevating piston 50 is largely a pressure acting part. 51 , a connection part 53 , and a gate pin 55 .
  • the pressure acting part 51 forms an inclined surface 51a having a shape in which the diameter is gradually reduced while proceeding downward so that a descending force is applied by the inflow pressure of the resin supplied via the resin furnace 11b to the upper part.
  • the pressure acting part 51 is provided in a hollow tubular shape so that the resin flows therein, and a descending chamber (a) is formed, which is a space in which the diameter is reduced while proceeding downward from the upper side of the inside based on the drawing.
  • the inclined surface 51a is formed to do this, and the molten resin supplied from the resin furnace 11b acts as a descending force as the flow is rapidly reduced in the descending chamber (a) section of the pressure acting part 51 .
  • connection part 53 is configured to form a passage 53h extending downwardly based on the drawing on the lower side of the pressure acting part 51 and penetrating vertically so that the resin passes in the downward direction.
  • this connection part 53 is a tubular member that is connected with a reduced diameter at the lower part of the pressure acting part 51, and one or a plurality of passages ( 53h), the resin acting on the lowering chamber (a) moves through this passage (53h).
  • the gate pin 55 extends from the center of the connection part 53 and is disposed on the runner part 33, and the lower end thereof selectively opens and closes the gate g of the mold module m by a lifting operation. As such, it is configured to form an ascending chamber (b) that is a space between the runner part (33) and the runner part (33). When the lifting chamber (b) acts on the resin pressure, the lifting force is generated and the lifting piston 50 moves upward.
  • the gate fin 55 in the present invention extends long from the lower center of the connection part 53 and is disposed in the center of the runner part 33, which is a space filled with resin around it.
  • a chamber (b) is formed, and an end portion thereof is positioned to shield the gate of the mold module (m) and selectively opens and closes the gate (g) by a lifting operation when the resin pressure is applied.
  • the gate pin 55 has a size to shield the gate g of the mold module m at the lower end, and has a ventilation hole processed in the form of a slit between the gate g and the gate g in the direction perpendicular to the side. 55s). At this time, in the ventilation hole 55s, the lifting piston 50 should easily perform a lowering operation by the pressure of the resin supplied from the injection cylinder, but the resin around the gate pin 55 and the gate g is solidified.
  • vent hole (55s) that is a gap to the extent that the resin in the ascending chamber (b) does not flow down, so that this part can easily burst when the initial resin pressure is applied.
  • the return spring 20 has an upper end hooked on the upper part of the expansion space 11a of the nozzle 10 and a lower end hooked with a stepped jaw 31a formed on one side of the inner side of the runner cylinder 30, and the pressure action
  • the lifting piston 50 When the lifting piston 50 is raised by the upper end of the part 51 in contact, it serves to apply an elastic force in the downward direction. That is, when no injection pressure is applied to the lifting piston 50, the return spring 20 is caught on the stepped jaw 31a and acts as an elastic support force so that the lifting piston 50 does not move upward.
  • the resin pressure from the injection cylinder acts on the pressure acting portion 51 of the lifting piston 50, the state is maintained in the state of being caught by the stepped jaw 31a.
  • the lifting piston 50 overcomes the elastic support force of the return spring 20 and moves upward.
  • the fully open state for the gate (g) is maintained.
  • the return spring 20 in the contracted state by the upward movement of the lifting piston 50 is elastic.
  • the lifting piston 50 is moved down by the restoring force to return the gate g to the shielded position.
  • the nozzle 10 forms a state in which the gate pin 55 of the lifting piston 50 shields the gate g of the mold module m in the injection standby state.
  • the resin enters the expansion space 11a through the resin furnace 11b. is brought in
  • the resin introduced into the expansion space 11a in this way flows into the pressure acting part 51 of the lifting piston 50 provided to be able to ascend and descend inside the runner part 33 and acts a descending pressure, thereby applying a descending pressure. 50) temporarily descends as shown in FIG. 6 to form a state in which a part of the gate g is opened.
  • injection pressure opening/closing control type hot runner valve device according to a second embodiment of the present invention will be described with reference to FIGS. 13 to 17, but the injection pressure opening/closing control type hot runner valve device according to this embodiment is the same as the one described above.
  • the same reference numerals are assigned to the components performing the operation, and the redundant description of each component will be omitted or briefly described.
  • FIG. 13 is a cut-away perspective view showing the internal structure of the second embodiment of the present invention.
  • a hollow tubular shape, a resin passage 11b through which the molten resin passes is formed in the upper part of the inner center, and an expanded space 11a formed by expanding the diameter is formed on the lower side of the resin passage 11b.
  • the body 11 and the runner cylinder 30 connected to the gate g of the mold module m by providing a conduit corresponding to the expansion space 11a as assembled and connected to the open lower part of the body 11 ), and a lifting piston (50) that is provided inside the runner cylinder (30) and is elevating and interlocking by the resin pressure acting on the upper and lower sides by the action pressure of the resin acting from the injection cylinder (50) And, it is provided in the extension space (11a) of the body (11), the upper end of which is supported by being caught on the upper part of the extension space (11a), and the lower end of the stepped jaw (31a) provided on the inner upper side of the runner cylinder (30)
  • the injection pressure opening/closing control type hot runner valve device 1 made of a return spring 20 acting as
  • a tubular body 11 having a resin furnace 11b and an expansion space 11a formed therein as an outer body is provided to surround the outer surface of the body 11 to prevent the resin from solidifying
  • a nozzle 10 consisting of a heater 15 and a housing 13 that is a cover element surrounding the outer surface of the heater 15, and the nozzle 10 are assembled by screwing at the lower side of the nozzle 10, and the resin is supplied and guided to the lower side
  • FIG. 15 to 17 are cross-sectional views for explaining the operation of the second embodiment.
  • FIG. 16 is a state in which the gate g of the mold module m is shielded
  • FIG. 17 is the lifting piston 50 temporarily descending. to show a state in which the gate g of the mold module m is temporarily opened
  • FIG. 18 shows the resin for the cavity of the mold by upward displacement by the resin pressure acting on the descending chamber a of the lifting piston 50. It shows a state in which charging is performed, that is, a state in which the gate g is fully opened.
  • Figure 18 is a rendered image diagram to help the understanding of the drawings of Figures 15 to 17,
  • Figure 19 is the configuration of the first embodiment is arranged as the first injection valve device, the configuration of the second embodiment is described above It is a view exemplifying the configuration of the second and subsequent valve devices that perform the operation in conjunction with the injection operation of the valve device of the first embodiment.
  • the return spring 20 installed in the expansion space 11a of the nozzle 10 to apply an elastic support force in the downward direction, and the return spring 20 connected to the lower side of the body 11 and assembled on the inner upper side of the return spring 20
  • a runner cylinder 30 comprising a barrel portion 31 having a stepped step 31a on which the lower end is caught and a runner portion 33 extending from the lower portion of the barrel portion 31 to have a reduced diameter, and the runner cylinder (30) is provided so as to be able to ascend and descend while in
  • An injection pressure opening/closing control type hot runner valve device 1 composed of a lifting piston 50 made of a pin 55 is shown.
  • the body 11 the runner cylinder 30, the lifting piston 50, and the return spring It consists of (20).
  • the nozzle 10 is an element for receiving resin from the injection cylinder and guiding it to the cavity side of the mold. 15) and a housing 13 configured to surround the heater 15 .
  • the body 11 is provided as a tubular member penetrating up and down, and the upper part is opened to receive the resin in the molten state from the injection cylinder, and the inner center is the resin furnace 11b. It is provided to provide a passage through which the supplied resin is moved, and a return spring 20 and a runner cylinder 30 are formed by expanding the diameter with respect to the resin furnace 11b on the lower side of the resin furnace 11b.
  • ) is a configuration in which an extended space 11a, which is a space to be installed, is formed.
  • the heater 15 is provided to surround the outer surface of the body 11 and receives power from the outside to generate heat so that the resin flowing therein is not solidified and maintained in a molten state, and the housing Reference numeral 13 denotes a member that protects the heater 15 from being exposed to the outside.
  • the runner cylinder 30 is assembled with the upper end connected to the lower inner side of the body 11 by screwing, and on the inner upper and lower sides, a stepped protrusion 31a and a locking protrusion 33a are formed by reducing diameters, respectively, and , is a configuration consisting of a runner portion 33 provided with an outlet (33b) to the lower portion of the resin is discharged. Since the runner cylinder 30 is substantially the same as the configuration of the first embodiment described above, a detailed description thereof will be omitted. However, in the present invention, the runner cylinder 30 is exemplified by screwing to the lower part of the body 11 in consideration of workability and assembling property, but may be provided integrally if integrally processing and molding is possible.
  • the lifting piston 50 has a feature different from that of the first embodiment described above in part of its technical configuration. As an element selectively shielding the gate g of the mold module m by the .
  • the pressure acting part 51 forms an inclined surface 51a having a shape in which the diameter is gradually reduced while proceeding downward so that a descending force is applied by the inflow pressure of the resin supplied via the resin furnace 11b to the upper part.
  • the pressure acting part 51 is provided in a hollow tubular shape so that the resin flows therein, and a descending chamber (a) is formed, which is a space in which the diameter is reduced while proceeding downward from the upper side of the inside based on the drawing.
  • the inclined surface 51a is formed to do this, and the molten resin supplied from the resin furnace 11b acts as a descending force as the flow is rapidly reduced in the descending chamber (a) section of the pressure acting part 51 .
  • the discharge part 54 is extended with a reduced diameter downward of the pressure acting part 51 , and the resin of the pressure acting part 51 passes in the horizontal, ie, side direction, based on the drawing to pass through the rising chamber (b). ) to form a discharge passage (54h) to flow to the side, and the lower surface is an element caught by the locking jaw (33a) when descending.
  • one or a plurality of the discharge passages 54h may be formed on the side surface.
  • the gate pin 55 extends downward from the center of the discharge part 54 in a straight line and is disposed on the runner part 33, and the lower end thereof is selectively disposed on the gate of the mold module m by a lifting operation.
  • This gate pin 55 is configured to form an ascending chamber b, which is a space, between the runner part 33, and when a resin pressure is applied to the ascending chamber b, a lifting force is generated and the lifting piston (50) makes an upward movement.
  • the gate fin 55 in the present invention extends long from the lower center of the connection part 53 and is disposed in the center of the runner part 33, which is a space filled with resin around it.
  • a chamber (b) is formed, and an end portion thereof is positioned to shield the gate of the mold module (m) and selectively opens and closes the gate (g) by a lifting operation when the resin pressure is applied.
  • the return spring 20 has an upper end hooked on the upper part of the expansion space 11a of the nozzle 10 and a lower end hooked with a stepped jaw 31a formed on one side of the inner side of the runner cylinder 30, and the pressure action When the lifting piston 50 is raised by the upper end of the part 51 in contact, it serves to apply an elastic force in the downward direction.
  • the nozzle 10 forms a state in which the gate pin 55 of the elevating piston 50 shields the gate g of the mold module m in the injection standby state as shown on the left side of the drawings in FIGS. 15 and 18 .
  • the resin in the molten state from the injection cylinder acts on the pressure acting part 51 of the lifting piston 50 via the resin furnace 11b of the body 11 constituting the nozzle 10, , as shown in the drawings located in the middle of FIGS. 16 and 18 as the downward pressure by the resin pressure acts on the lifting piston 50, it temporarily descends to open a part of the gate g of the mold module m. form a state
  • FIG. 19 shows the arrangement and configuration of the main valve device (main) that first receives the resin through the injection cylinder and the manifold in the first embodiment of the present invention, and then the second (sub1), the third (sub1), etc. shows the arrangement of the valve device of the second embodiment of the present invention, and STEP1, located at the top of the drawing, is supplied with resin to the valve device (main) of the first embodiment located at the leftmost side of the mold. shows the state in which injection of the resin into the cavity of As the resin supply pressure acts on the inside, each gate fin maintains a temporarily lowered state.
  • the resin injected through the valve device (main) of the first embodiment flows in and flows into the cavity space side to which the valve device (sub1) of the second embodiment is disposed close to one side, at this time
  • the gate fin 55 is temporarily moved upward.
  • the resin injected into the cavity of the mold passes through (sub1), and at the same time, the gate pin 55 of (sub1) performs a full upward operation, opens the gate, and supplies the resin to the cavity of the mold. , the resin passing through (sub1) flows to the cavity side connected to (sub2) disposed on one side thereof.
  • STEP5 shows the state in which the resin filling of the cavity of the mold is completed.
  • (main), (sub1), and (sub2) are the total pressure inside the nozzle and the pressure equilibrium with the inside of the cavity of the mold, so that the return spring The lifting piston moves down by the restoring force, thereby forming a state in which the gate is blocked.
  • STEP6 shows the state of the nozzle at the time of taking out the molded article molded from the cavity of the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de soupape à canal chaud de type à ouverture/fermeture de porte utilisant la pression de résine. La présente invention concerne un dispositif de soupape à canal chaud de type à commande d'ouverture/de fermeture de pression d'injection qui permet à un piston ascendant d'être automatiquement commandé pour être déplacé vers le haut ou vers le bas par une action d'équilibre de pression avec une pression d'injection d'un cylindre d'injection pour permettre une opération d'ouverture/de fermeture par rapport à une porte, et assure une opération d'ouverture/de fermeture de porte stable et précise indépendamment d'un cas dans lequel la pression de résine est faible ou la vitesse de celle-ci est faible.
PCT/KR2021/012120 2021-03-25 2021-09-07 Dispositif de soupape à canal chaud de type à commande d'ouverture/de fermeture de pression d'injection WO2022203135A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20210039140 2021-03-25
KR10-2021-0039140 2021-03-25
KR10-2021-0118301 2021-09-06
KR1020210118301A KR102522069B1 (ko) 2021-03-25 2021-09-06 사출압 개폐 제어형 핫런너 밸브장치

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WO2022203135A1 true WO2022203135A1 (fr) 2022-09-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001088171A (ja) * 1999-09-24 2001-04-03 Nippon Tekunika Kk 射出成形装置
KR20060042878A (ko) * 2004-02-05 2006-05-15 피사 코포레이션 밸브노즐
KR200418316Y1 (ko) * 2006-03-15 2006-06-09 시ㆍ화인테크놀로지 주식회사 사출성형장치용 노즐
KR101718324B1 (ko) * 2017-01-13 2017-03-21 김혁중 핫런너의 사이드게이트 밸브장치
KR102010997B1 (ko) * 2017-01-13 2019-08-14 김혁중 핫런너의 수지압 승강단속형 밸브장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001088171A (ja) * 1999-09-24 2001-04-03 Nippon Tekunika Kk 射出成形装置
KR20060042878A (ko) * 2004-02-05 2006-05-15 피사 코포레이션 밸브노즐
KR200418316Y1 (ko) * 2006-03-15 2006-06-09 시ㆍ화인테크놀로지 주식회사 사출성형장치용 노즐
KR101718324B1 (ko) * 2017-01-13 2017-03-21 김혁중 핫런너의 사이드게이트 밸브장치
KR102010997B1 (ko) * 2017-01-13 2019-08-14 김혁중 핫런너의 수지압 승강단속형 밸브장치

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