Injection molding apparatus

Patent metadata

Field	Value
Publication number	US-9056416-B2
Application number	US-201313890576-A
Country	US
Kind code	B2
Filing date	May 9, 2013
Priority date	May 16, 2012
Publication date	Jun 16, 2015
Grant date	Jun 16, 2015

Abstract

An injection molding apparatus has at least two mold clamping mechanisms for clamping respective molds. A hydraulic pressure supply source supplies hydraulic pressure to the at least two mold clamping mechanisms to clamp the respective molds. A a hydraulic-pressure-supply-destination selection section is configured to allow hydraulic pressure from the hydraulic pressure supply source to be selectively supplied to any one of the two mold clamping mechanisms. At least two injecting machines are configured to inject resin material to the respective molds clamped by the respective two mold clamping mechanisms. A non-hydraulic power supply source drives the at least two injecting machines to inject the resin material.

First claim

What is claimed is:

1. An injection molding apparatus comprising:
a plurality of injection molds;
a plurality of mold clamping mechanisms for clamping the respective plurality of injection molds;
a turntable mounted to undergo turning movement for shifting the injection molds between the mold clamping mechanisms;
a single hydraulic pressure supply source for supplying mold clamping hydraulic pressure to the plurality of mold clamping mechanisms;
a hydraulic-pressure-supply-destination selection section for making a hydraulic-pressure supply destination selection such that hydraulic pressure is selectively supplied from the single hydraulic pressure supply source to any one of the plurality of mold clamping mechanisms;
a plurality of injecting machines provided in association with the plurality of mold clamping mechanisms for injecting resin material to the injection molds clamped by corresponding ones of the mold clamping mechanisms; and
an electric power supply source or a compressed air supply source provided for supplying driving electric power or compressed air to the plurality of injecting machines;
wherein one of the injecting machines is configured for injecting a thermoplastic resin, and another of the injecting machines is configured for injecting a non-thermoplastic resin.

2. The injection molding apparatus according to claim 1 , further comprising an ejection mechanism for ejecting a molded product from each of the injection molds, and wherein the driving electric power or compressed air is supplied from the electric power supply source or the compressed air supply source to the ejection mechanism.

3. The injection molding apparatus according to claim 1 , wherein the single hydraulic pressure supply source is a hydraulic pump; and further comprising a drive motor that drives the hydraulic pump under a condition that a number of rotations of the drive motor is variably controlled to thereby vary a discharge flow rate of the hydraulic pump.

4. The injection molding apparatus according to claim 1 ; wherein the non-thermoplastic resin is liquid mixed material obtained by stirring and mixing liquid resin material and a curing agent.

5. The injection molding apparatus according to claim 1 , wherein the plurality of mold clamping mechanisms comprises a first mold clamping mechanism including a first mold clamping cylinder, a first pressure receiving board drivable by the first mold clamping cylinder, first tie rods extending upward from the first pressure receiving board, and a first movable plate secured to and connecting the respective upper ends of the first tie rods; and a second mold clamping mechanism including second tie rods, a second pressure receiving board connecting respective upper ends of the second tie rods, a second movable plate connected to the second tie rods for movement between the turntable and the second pressure receiving board, and a second mold clamping cylinder connected to the second pressure receiving board for moving the second movable plate.

6. The injection molding apparatus according to claim 5 , wherein the plurality of injection molds comprises first and second injection molds; wherein the first injection mold comprises a first movable mold mounted to the first movable plate of the first mold clamping mechanism and a first stationary mold mounted to the turntable; and wherein the second injection mold comprises a second movable mold mounted to the second movable plate of the second mold clamping mechanism and a second stationary mold mounted to the turntable.

7. The injection molding apparatus according to claim 6 , wherein the turntable, the mold clamping mechanisms and the injection molds are configured so that in response to turning movement of the turntable, the first stationary mold angularly moves between a position under the first movable plate and a position under the second movable plate, and the second stationary mold angularly moves between a position under the second movable plate and a position under the first movable plate.

8. The injection molding apparatus according to claim 5 , wherein the hydraulic-pressure-supply-destination selection section is provided between the hydraulic pressure supply source and the first and second mold clamping cylinders and is configured to make a hydraulic-pressure supply destination selection such that hydraulic pressure is selectively supplied from the single hydraulic pressure supply source to any one of the first and second mold clamping cylinders.

9. The injection molding apparatus according to claim 1 , wherein the plurality of mold clamping mechanisms comprises a first mold clamping mechanism and a second mold clamping mechanism; and wherein the hydraulic-pressure-supply-destination selection section is configured to make the hydraulic-pressure supply destination selection so that mold clamping by the first mold clamping mechanism and mold clamping by the second mold clamping mechanism are performed with a time difference therebetween.

10. The injection molding apparatus according to claim 1 , wherein the plurality of mold clamping mechanisms comprises a first mold clamping mechanism and a second mold clamping mechanism; and wherein the hydraulic-pressure-supply-destination selection section is configured to make the hydraulic-pressure supply destination selection so that mold opening by the first mold clamping mechanism and mold opening by the second mold clamping mechanism are performed with a time difference therebetween.

11. An injection molding apparatus comprising:
at least two mold clamping mechanisms for clamping respective molds;
a hydraulic pressure supply source for supplying hydraulic pressure to the at least two mold clamping mechanisms to clamp the respective molds;
a hydraulic-pressure-supply-destination selection section configured to allow hydraulic pressure from the hydraulic pressure supply source to be selectively supplied to any one of the two mold clamping mechanisms;
at least two injecting machines for injecting resin material to the respective molds clamped by the respective two mold clamping mechanisms, one of the at least two injecting machines being configured for injecting a thermoplastic resin, and the other of the at least two injecting machines being configured for injecting a non-thermoplastic resin; and
a non-hydraulic power supply source for driving the at least two injecting machines to inject the resin material.

12. The injection molding apparatus according to claim 11 , wherein the non-hydraulic power supply source comprises an electric power supply source for supplying driving electric power to the at least two injecting machines.

13. The injection molding apparatus according to claim 11 , wherein the non-hydraulic power supply source comprises a compressed air supply source for supplying compressed air to the at least two injecting machines.

14. The injection molding apparatus according to claim 11 , further comprising a turntable mounted to undergo pivotal movement for shifting the molds between the respective mold clamping mechanisms.

15. The injection molding apparatus according to claim 11 , wherein the hydraulic-pressure-supply-destination selection section is configured to allow hydraulic pressure from the hydraulic pressure supply source to be selectively supplied to any one of the two mold clamping mechanisms so that mold clamping by one of the at least two mold clamping mechanism and mold clamping by the other of the two mold clamping mechanisms are performed with a time difference therebetween.

16. The injection molding apparatus according to claim 11 , furthe

Assignees

• Nissei Plastics Ind Co

Inventors

• Ikeda Toru
• Okubo Hiroo
• Obinata Akira

Classifications

• B29C31/02

  Dispensing from vessels, e.g. hoppers {(into a mould cavity B29C31/04; large containers characterised by discharge means B65D88/28, B65D88/54)} · CPC title

• B29C45/4005 Primary

  Ejector constructions; Ejector operating mechanisms (B29C45/44 takes precedence) · CPC title

• B29C45/7666

  of power or energy, e.g. integral function of force · CPC title

• B29C45/062

  carrying mould halves co-operating with fixed mould halves · CPC title

• B29C45/67

  hydraulic · CPC title