JPH074016U - Injection molding machine - Google Patents

Abstract

(57) [Summary] [Purpose] A structure that realizes the basic idea of switching multiple extruding rods alternately with a time difference and operating them as a structure with the simplest structure possible with low manufacturing cost and injection with excellent mass productivity. To provide a molding machine. [Structure] The moving bodies 1 and 2 are arranged in parallel in the moving direction at a predetermined interval, and the pushing rods 3
In the injection molding machine in which the ejecting rod 4 protruding from the movable body 2 is an ejector rod for ejecting and discharging the molded product 5, the movable body 1 is moved to the other movable body 2. A movable rod 6 for moving the movable rod 6 without moving the movable rod 6 is provided, and a connecting mechanism 7 for connecting the movable rod 6 and the other moving body 2 is provided so as to be connectable / disconnectable. 8 is an injection molding machine configured to be connectable / disconnectable by engaging / disengaging operations of an engagement receiving portion 9 such as a pin hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding machine that operates by switching a plurality of extrusion rods alternately with a time difference.

[0002]

[Problems to be solved by conventional techniques and devices]

 For example, the applicant has invented Japanese Patent Publication No. 1-53616 and Japanese Patent Publication No. 2-46144 as this type of device.

However, in the former invention, as a means for moving a moving body having protruding push rods alternately with a time difference, in the former invention, the small diameter axial rod of the coaxial movable rod penetrates the passage hole of one moving body. The other moving body is moved, and the large diameter rod pushes the peripheral portion of the passage hole to move only one moving body.

Further, in the latter invention, a shutter that closes the passage hole of one moving body is configured to be openable and closable, and by closing the shutter, the shutter of the movable rod is pushed to move one moving body, When the shutter is opened, the movable rod penetrates the passage hole and moves only the other moving body.

In any case, constructing a coaxial movable rod to control it and providing a shutter on one of the moving bodies are very troublesome and complicated in structure, are expensive to manufacture, and are very expensive. There is a problem that it becomes a new injection molding machine.

An object of the present invention is to make an injection molding machine excellent in mass productivity with a structure that realizes a basic idea of switching operation having a structure as simple as possible so that the manufacturing cost is low.

[0007]

Means for Solving the Problems The gist of the present invention will be described with reference to the accompanying drawings.

A plurality of moving bodies 1 and 2 are arranged side by side at a predetermined interval in the moving direction, and pushing rods 3 and 4 are provided on each of the moving bodies 1 and 2 so as to project, and at least on the moving body 2. In an extrusion molding machine in which one push-out rod 4 is an ejector rod for pushing out a molded product 5 and discharging it, the moving body 1 can be moved to move without moving the other moving body 2. A rod 6 is provided, and a connecting mechanism 7 for connecting the movable rod 6 or a member moving by the movement of the movable rod 6 and another moving body 2 is provided so as to be connectable / disconnectable, and the connecting mechanism 7 is a pin or the like. The engagement portion 8 and the engagement receiving portion 9 such as a pin hole are configured to be switchable between coupling and releasing, and the coupling mechanism 7 is switched to operate to move one moving body 1 to another moving body 2. Move without moving It is configured so that it can be switched between the case where the moving body 2 is moved and the case where the other moving body 2 is moved without moving the one moving body 1 or the case where both moving bodies 1 and 2 are moved together. The present invention relates to an injection molding machine.

[0009]

[Action]

 When the connecting mechanism 7 is operated and the engaging portion 8 is in the disengaged state from the engagement receiving portion 9 and is in the non-connected (released) state, when the movable rod 6 moves, the other moving body 2 does not move, and Moving body 1 moves, and thereby one pushing rod 3 moves.

On the contrary, when the connecting mechanism 7 is operated and the engaging portion 8 engages with the lock receiving portion 9 to be in the connected state, the movable rod 6 and the other moving body 2 are integrated as in the embodiment, for example. The movable rod 6 moves so that the one moving body 1 and the other moving body 2 move together. In this case, since the moving bodies 1 and 2 are spaced by a predetermined distance, even if they move together, the other moving body moves the predetermined amount of protrusion first, so that only the other moving body 2 moves. Can be said.

[0011]

【Example】

 It will be described with reference to the drawings.

Reference numeral 11 is a nozzle portion for injecting the resin 12, 13 is a sprue portion, 14 is a runner portion branched to the left and right, 15 is a cavity portion, 16 is a parting line, 17 is a moving body storage portion, and 18 is a moving body. The body guide rod 19 is a hydraulic cylinder device that allows the movable rod 6 to move in and out.

In the present embodiment, the plate-block-shaped first moving body 1 and the second moving body 2 are arranged side by side in the moving body housing portion 17 at predetermined intervals and with respective movement permitting spaces.

The first moving body 1 is arranged on the front side (cavity portion 15 side), the second moving body 2 is arranged on the rear side, and the first moving body 1 is extended toward the cavity portion 15 with a sprue. The push-back rod inserted into the portion 13 is projected as the push rod 3, and the ejector rod is pushed through the second moving body 2 as the push rod 4 to penetrate the first moving body 1 and project toward the cavity portion 15. is doing.

On the other hand, similarly, the first moving portion 1 ′ for pushing the first moving body 1 and the second moving portion for pushing the second moving body 2 are guided by the moving body guide rod 18 in the same manner. 2'is arranged back and forth on the rear side of the second moving body 2, and similarly a pushing rod 3'for pushing the rear surface of the first moving body 1 is attached to the second moving body 2 on the first moving portion 1 '. And a protruding rod 4'for pushing the rear surface of the second moving body 2 is provided in the second moving portion 2'through the first moving portion 1 '.

The movable rod 6 is arranged so that the tip of the second moving portion 2 ′ penetrates the rear surface of the first moving portion 1 ′ so as to penetrate from the rear side to the front side of the second moving portion 2 ′.

There is provided a connecting mechanism 7 for connecting the movable rod 6 and the second moving portion 2 ′, or for releasing or switching the connection.

As shown in FIG. 3, the connecting mechanism 7 is provided with the hanging rod of the hydraulic cylinder device 20 as the engaging portion 8 on the second moving portion 2 ′ side, and the engaging hole into which the engaging portion 8 is inserted is engaged. The movable rod 6 is formed on the movable rod 6 as the receiving portion 9, and the hydraulic cylinder device 20 is moved to hang the engaging portion 8 into the second moving portion 2'and penetrate the second moving portion 2 '. The second moving portion 2'and the movable rod 6 are connected by inserting and fitting into the engagement receiving portion 9 of the first moving body 1 and the second moving body 2 so as to move together, When the engaging portion 8 is lifted and retracted from the engaging receiving portion 9, the connection is released, and the second moving portion 2 ′ and the second moving body 2 do not move due to the movement of the movable rod 6, and the first moving body 1 does not move. Only the mobile is configured to move.

By the movement of the movable rod 6, the first moving body 1 and the second moving body 2 move forward through the first moving portion 1 ′ and the second moving portion 2 ′, respectively. It is configured to return and move by biasing force such as.

Therefore, in the present embodiment, one push-back rod fitted into the sprue portion 13 as the push-out rod 3 and two ejector rods as the push-out rod 4 are alternately moved with a time lag. Works like.

First, the resin 12 is injected from the nozzle portion 11 and injected into the left and right cavity portions 15 via the sprue portion 13 and the runner portion 14.

After the pressure is maintained and the material is cooled and cured, the push-back rod provided as the push-out rod 3 is inserted into the sprue portion 13 before being released from the parting line 16 (die splitting), so that it is in a semi-cured state or a cured state. The resin 12 is pushed back toward the nozzle portion 11. FIG. 1 shows the process of extrusion.

In this movement, the connecting mechanism 7 is in the released state, the movable rod 6 advances, only the first moving portion 1 ′ is pushed forward, and the pushing rod 3 ′ pushes the first moving body 1, Extrusion It is performed by moving the rod 3 forward.

After this mold splitting is performed, when the returned movable rod 6 is advanced again, this time the coupling mechanism 7 is actuated to insert the engaging portion 8 into the engaging receiving portion 9, and the second moving portion 2 ′. And the movable rod 6 are connected.

When the movable rod 6 moves in this state, the second moving portion 2 ′ moves forward as shown in FIG. 2, and the second moving body 2 is pushed by the pushing rod 4 ′ so that the pushing rod 4 moves. A certain ejector rod advances, and the hardened molded product 5 is pushed out and dropped.

At this time, in the present embodiment, the first moving body 1 moves again together with the movable rod 6.

The alternating movement control based on the connecting mechanism 7 of the first moving body 1 and the second moving body 2 can be variously configured, and the first moving body 1 is moved and the pushing rod 3 is projected. Further, when the movable rod 6 moves forward, it may be connected by the connecting mechanism 7 to move the second moving body 2 to project the pushing rod 4, or the movable rod 6 may be returned once as in the present embodiment. It is designed such that after the first moving body 1 is moved back, even if the first moving body 1 and the second moving body 2 are moved together as in this embodiment, only the second moving body 2 is moved. You may.

In this embodiment, the push rod 3 is used as a push back rod for pushing back the resin 12 in the sprue portion 13 and the push rod 4 is used as an ejector rod, and the present invention is applied to the time difference control. However, the push-back rod pushes back the resin 12 in the sprue portion 13 to enable molding and discharging of sprueless products, thus saving the resin material. In addition, the tip of this push-back rod can be used to block the nozzle part 11, and even if the nozzle part 11 and the sprue part 13 are designed with a large diameter, resin leakage can be reliably prevented and the sprue part 13 has a large diameter. As a result, even if the resin 12 in the sprue part 13 is in a semi-molten state, the molded product 5 will not be hindered and the small diameter nozzle part 11 will not be required, so injection resistance will be low and low pressure injection will be possible, thus reducing warpage and deformation. This is an excellent molding method that can reduce the variation in the quality of the molded product 5 for each one shot.

[0029]

[Effect of device]

 Since the present invention is configured as described above, a connecting mechanism is provided which is configured to be switchable between connecting and disconnecting by simply engaging and disengaging the engaging portion such as the pin and the engaging and receiving portion such as the pin hole. By simply disengaging the engaging part with respect to the engaging receiving part, multiple extruding rods can be alternately switched and moved, and low-cost rod movement with excellent mass productivity can be switched. A controllable injection molding machine can be realized.

[Brief description of drawings]

FIG. 1 is a plan view of a first moving body of the present embodiment during movement of a push rod.

FIG. 2 is a plan view of the second moving body of the present embodiment when movement of the pushing rod is completed.

FIG. 3 is a front sectional view of a connecting mechanism according to the present embodiment.

[Explanation of symbols]

 1.2 Moving body 3.4 Pushing rod 5 Molded product 6 Movable rod 7 Connecting mechanism 8 Engagement part 9 Engagement receiving part

Claims (1)

[Scope of utility model registration request] 1. A plurality of moving bodies are arranged side by side at a predetermined interval in the moving direction, and each of the moving bodies is provided with a pushing rod, and at least one pushing rod projecting from the moving body is a molded product. In an injection molding machine configured with an ejector rod to be pushed out and discharged, a movable rod is provided which moves the one moving body without moving the other moving body, and the movable rod or the movable rod moves. A connection mechanism that connects members and other moving bodies is provided so that connection and release can be switched, and this connection mechanism can be switched between connection and release by engaging and disengaging the engagement part such as a pin and the engagement receiving part such as a pin hole. In this case, the connection mechanism is switched and operated to move one moving body without moving the other moving body and when moving the other moving body without moving the one moving body. The injection molding machine is configured so that it can be switched between the case of moving the moving body and the case of moving both moving bodies together.