JPH034499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is intended for use in resin processing machines, particularly injection molding machines, to reduce the amount of resin that falls and accumulates on the injection molding machine bed during purging prior to the desired injection molding process. The present invention relates to a cooling type cover device for molten resin.

[Conventional technology] When processing with an injection molding machine, when starting up a new process or changing colors, the injection mechanism is moved back to a retracted position on the bed of the injection molding machine to stabilize the properties of the molten resin. A so-called "purge" operation is carried out to discharge the residual resin in the melting/injection cylinder from the tip (nozzle hole) of the melting/injection cylinder until the color is changed or when the color is changed.

By the way, in the conventional purge method, as shown in FIG. 4, the mold clamping mechanism 1 including the mold 3 of the injection molding machine
The molten resin R is once discharged onto the cover on the upper surface of the injection molding machine bed 5 between the injection mechanism 2 including the melting/injection cylinder 4, and the deposited molten resin R is waited for to cool down. It was being disposed of.

[Problems to be solved by the invention] In the conventional technology described above, as the purging is repeated, the temperature of the cover itself increases due to the heat of the discharged and deposited molten resin, so that the molten resin in contact with the cover increases. The cooling solidification tendency of the resin part is slowed down. In general, a lump of molten resin (in a freshly made rice cake-like state) can be easily removed once the surface has cooled and solidified, but a freshly made rice cake has a sticky force that makes it difficult to remove the cover (iron plate). Because they are stuck and cannot be easily removed, they often cannot be disposed of promptly, and the user has to wait until they can be disposed of, resulting in a reduction in work efficiency.

The present invention has been made in view of the problems of the conventional techniques described above, and it shortens the waiting time for the purged molten resin to be ready for processing, and also makes it possible to easily remove the molten resin. ,
An object of the present invention is to provide a cooling type cover device for an injection molding machine that improves workability.

[Means for Solving the Problems] In order to achieve the above object, the cooling type cover device for an injection molding machine of the present invention is provided in an injection molding machine equipped with a mold clamping mechanism and an injection mechanism. disposed at a predetermined position on the bed of the injection molding machine where molten resin discharged from the mechanism falls and accumulates, and comprising a cover member and below the cover member;
It is characterized by including a cover member cooling device for cooling the cover member.

[Operation] During purging, the molten resin discharged from the injection mechanism falls and accumulates on the cover member. The deposited molten resin is cooled by the cover member which is in a cooled state by the cover member cooling device. At this time, the contact portion of the molten resin with the cover member is immediately cooled, and therefore rapidly solidified.

Even if the purge is repeated frequently,
Since the cover member constantly radiates heat and does not accumulate heat and its temperature does not rise, the molten resin is quickly solidified and easily separated from the cover member, as described above.

[Example] Next, an example of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing the structure of a first embodiment of a cooling type cover device for an injection molding machine according to the present invention. For ease of explanation, the injection molding machine shown in FIG. 1 is of similar construction to the injection molding machine shown in FIG. 4, and similar components are designated with the same reference numerals.

In FIG. 1, a mold clamping mechanism 1 including an injection molding machine mold fixing plate 6 and a tie bar 7 disposed on the upper surface of an injection molding machine bed 5, and a melting/injection cylinder 4 disposed in series with the mold clamping mechanism 1. Injection mechanism 2 including
An opening 8 is formed in a portion of the injection molding machine bed 5 between which the molten resin discharged (purged) from the melting/injection cylinder 4 falls and accumulates, that is, in a conventional cover arrangement portion. Reference numeral 9 is a cooling type cover device, and this cooling type cover device 9 is
It includes a cover member 10 and a cover member cooling device that is integrated with the cover member 10 and that cools the lower surface of the cover member 10. The cover member cooling device includes a sealed box-shaped jacket 11, a cooling water inlet 13 and a cooling water outlet 14. The sealed box-shaped jacket 11 is provided with a partition 12 for forming a cooling water flow passage. The cover member cooling device also has a sealed box-shaped jacket 11.
is removably installed in the opening 8 on the upper surface of the injection molding machine bed 5, and is configured to be supported around the four circumferences of the cover member 10, and if necessary, bolts 15 etc. It may also be fixed on the injection molding machine bed 5 using the injection molding machine. As is clear from the above description, the cover member cooling device is configured below the cover member 10.

Next, the operation of this embodiment will be explained.

At the time of starting up the injection molding process or changing the color, that is, at the time of purging, as described above, the sealed box-shaped jacket 11 is installed in the opening 8 on the top surface of the injection molding machine bed 5, and the cover member 10 is
The cover member cooling device is supported at the peripheral edge of the cover member, and if necessary, it is fixed with bolts 15 or the like. Next, when cooling water is injected into the sealed box-shaped jacket 11 from the cooling water inlet 13, the injected cooling water flows through the partition 1.
The cooling water flows in the direction of the arrow W within the sealed box-shaped jacket 11 according to the cooling water flow path formed by 2 and flows out of the sealed box-shaped jacket 11 from the cooling water outlet 14. In this way, if the cooling water is circulated and the cover member 10 is always maintained in a cooled state, the molten water discharged from the melting/injection cylinder 4 and falling and depositing on the cover member 10 during the purging operation can be removed. The resin comes into contact with the cover member 10 and is quickly cooled and solidified.

(Second Embodiment) FIG. 2 is a perspective view similar to FIG. 1 of a second embodiment of the cooling type cover device according to the present invention.

In FIG. 2, the cooling type cover device according to this embodiment includes a cover member cooling device 16 and a cover member 1.
7 are configured separately. The cover member cooling device 16 includes a jacket 18 that has an opening 19 formed on the upper surface of the injection molding machine bed 5 and cools the lower surface of a cover member 17 (described later) supported by the injection molding machine bed 5, and a water storage tank. 25, a cooling water deflection plate 24, and a water supply manifold 21 disposed at the cooling water inlet 20 and having a plurality of parallel nozzles 22.
and a cooling water outlet 2 provided at the bottom of the water storage tank 25.
Consists of 3. As is clear from the above description, the cover member cooling device 16 is built into the injection molding machine bed 5. Further, the cover member 17 has the opening 1
The peripheral edge of the injection molding machine bed 5 covers the injection molding machine bed 5.
It has a plurality of heat radiating pieces 26 arranged in parallel on its lower surface, and the heat radiating pieces 26 are inserted into the opening 19. The plurality of heat radiating pieces 26
and the plurality of parallel nozzles 22 cooperate to form a plurality of cooling water flow passages. If necessary, the cover member 17 may be fixed to the injection molding machine bed 5 at its periphery with bolts or the like, as in the previously described embodiments.
It is necessary to provide a watertight packing (not shown) on the lower surface of the periphery of 7. If a handle 27 is attached to the upper surface of the cover member 17 as shown in the figure, it is convenient to remove the handle 27. As is clear from the above description, the cover member cooling device 16 is configured below the cover member 17.

Next, regarding the operation of this embodiment, only the points that are different from that of the first embodiment will be explained.

As described above, when the cover member 17 is mounted on the upper surface of the injection molding machine bed 5, a plurality of cooling water flow passages including respective parallel nozzles 22 are formed in the jacket 18 by the heat dissipating piece 26 of the cover member 17. When the cooling water from the cooling water inlet 20 flows from each parallel nozzle 22 through the respective cooling water flow passages via the water supply manifold 21, it draws heat from the cover member 17 from the heat dissipating piece 26 and moves along the arrow W. The direction of the cooling water is changed by the cooling water deflecting plate 24, flows into the water storage tank 25, flows out from the cooling water outlet 23 provided at the bottom of the water storage tank 25, and cools the cover member 17.

The cooling type cover device shown in FIG. 2 supplies cooling water to the cover member cooling device 1 by flowing water from its supply source.
6 is passed through and cooled, but as is clear from FIG. 3, which shows a modification of the cover member cooling device, it can also be a self-contained cover member cooling device. That is, the cooling water outlet 23 and the cooling water inlet 2
0 and a heat exchange means such as a radiator 29 and the pump 2
8 are arranged in series. As a result, the cooling water flows from the cooling water inlet 20 to the jacket 18, the cooling water deflection plate 24, the water storage tank 25, the cooling water outlet 23, and the radiator 2.
9. A closed cooling water loop is formed which passes sequentially through the pump 28 and returns to the cooling water inlet 20.

As described above, the cooling type cover device includes a cover member, which is a main component thereof, and a cover member cooling device including a jacket, either integrally configured (see the first embodiment above) or configured separately (see the above first embodiment). (Refer to the second embodiment), and each detailed structure, such as the flow state of the cooling water in the jacket, the combination structure of the cover member and the jacket, and the automatic temperature control of the cover member, is within the scope of the present invention. Various plans can be made.

[Effects of the invention] Since the present invention is configured as described above, it produces the effects described below.

The part of the molten resin that comes into contact with the cover member is immediately cooled, so it solidifies rapidly.Also, even if purging is repeated frequently, the cover member constantly radiates heat and does not accumulate heat and its temperature does not rise. So,
As mentioned above, the molten resin is quickly solidified,
It can be easily removed from the cover member. As a result, when starting up a new process that requires purging during injection molding, or when changing the color of resin materials, the work required to remove the molten resin accumulated on the cover member is simplified and The waiting time for the resin to become ready for disposal is also shortened, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a first embodiment of a cooling type cover device for an injection molding machine according to the present invention, FIG. 2 is a perspective view showing the structure of a second embodiment of the present invention, and FIG.
The figure is a perspective view showing the configuration of a modification of the second embodiment;
FIG. 4 is a front view of essential parts of an injection molding machine for explaining a conventional purging method. 1...mold clamping mechanism, 2...injection mechanism, 3...mold,
4... Melting/injection cylinder, 5... Injection molding machine bed, 6... Injection molding machine mold fixing plate, 7... Tie bar, 8... Opening, 9... Cooling type cover device, 1
0... Cover member, 11... Sealed box-shaped jacket, 12... Partition, 13... Cooling water inlet, 14
... Cooling water outlet, 15 ... Bolt, 16 ... Cover member cooling device, 17 ... Cover member, 18 ...
Jacket, 20...Cooling water inlet, 21...Water supply manifold, 22...Parallel nozzle, 23...Cooling water outlet, 24...Cooling water deflection plate, 25...Water tank, 26...Radiating piece, 27... ... Handle, 28 ... Pump, 29 ... Heat radiator, R ... Molten resin.

Claims (1)

[Claims for Utility Model Registration] 1. In an injection molding machine equipped with a mold clamping mechanism and an injection mechanism, an injection molding machine is provided at a predetermined position on the bed of the injection molding machine where molten resin discharged from the injection mechanism falls and accumulates during purging. and a cover member;
A cooling type cover device for an injection molding machine, comprising a cover member cooling device configured below the cover member for cooling the cover member. 2. A practical use characterized in that the cover member and the cover member cooling device are integrally constructed, and the cover member cooling device is removably installed in an opening formed at the predetermined position of the injection molding machine bed. A cooling type cover device for an injection molding machine as claimed in claim 1. 3. The cover member and the cover member cooling device are configured separately, and the cover member cooling device includes:
Claims for registration of a utility model, characterized in that it is built into an injection molding machine bed having an opening formed at the predetermined position, and the cover member is removably attached to the injection molding machine bed so as to cover the opening. A cooling type cover device for an injection molding machine according to item 1. 4 The cover member cooling device has a cooling water inlet;
A cooling type cover device for an injection molding machine according to claim 2 or 3, which is a utility model and has a cooling water flow path including at least a jacket for cooling the lower surface of the cover member and a cooling water outlet.