JPH0434005Y2 - - Google Patents
Info
- Publication number
- JPH0434005Y2 JPH0434005Y2 JP4189787U JP4189787U JPH0434005Y2 JP H0434005 Y2 JPH0434005 Y2 JP H0434005Y2 JP 4189787 U JP4189787 U JP 4189787U JP 4189787 U JP4189787 U JP 4189787U JP H0434005 Y2 JPH0434005 Y2 JP H0434005Y2
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- material supply
- heating cylinder
- amount
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002994 raw material Substances 0.000 claims description 43
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 5
- 239000008188 pellet Substances 0.000 description 14
- 230000007547 defect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229930182556 Polyacetal Natural products 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
この考案は射出装置に原料ペレツトを所定量供
給するための射出成形機における原料供給装置に
関する。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a raw material supply device in an injection molding machine for supplying a predetermined amount of raw material pellets to the injection device.
（従来の技術）
射出成形において発生する成形不良のうち、シ
ヨートシヨツトやひけ等の成形不良は、溶融樹脂
の射出量の不足に負うところが少なくない。この
ような射出量不足が発生する重要な因子としては
原料供給装置による射出装置への原料供給量が安
定していないことが挙げられる。(Prior Art) Among the molding defects that occur in injection molding, molding defects such as shot shot and sink marks are often caused by insufficient injection amount of molten resin. An important factor contributing to the occurrence of such a shortage in injection amount is that the amount of raw material supplied to the injection device by the raw material supply device is not stable.
従来の原料供給装置としては、送りスクリユが
回転するケーシング前部の前記送りスクリユのね
じ山終端位置において原料ペレツトが射出装置の
加熱筒内へ供給される投入口が設けられてなるも
のがある。この従来装置に関し、本考案者等がポ
リアセタールの原料ペレツトについて実験したと
ころによると、その各原料供給量毎の標準偏差は
5.8072となつた。 Some conventional raw material supply devices are provided with an input port through which raw material pellets are supplied into the heating cylinder of an injection device at the end of the thread of the feed screw at the front of the casing where the feed screw rotates. Regarding this conventional device, the present inventors conducted experiments on polyacetal raw material pellets, and found that the standard deviation for each raw material supply amount was
It became 5.8072.
上述したような原料供給量が不安定となる原因
としては、一つには、成形品不要部分あるいは不
良成形品等を粉砕した不定形の廃材などの混入に
より原料ペレツトの移送密度が一様でないこと、
また一つには、送りスクリユの停止位置における
ねじ山の終端部の位相の違いによつて投入口から
投入される原料ペレツトの量に差異が生ずること
等によるのではないかと考えられる。 One of the reasons for the instability of the raw material supply amount mentioned above is that the density of raw material pellets is not uniform due to the mixing of irregularly shaped waste materials such as unneeded parts of molded products or crushed defective molded products. thing,
It is also believed that one reason is that the amount of raw material pellets input from the input port differs due to the difference in the phase of the end of the screw thread at the stop position of the feed screw.
（考案が解決しようとする問題点）
この考案は上述したような問題点を解決するた
めに提案されたものであつて、その目的とすると
ころは、原料の供給量をより安定させることがで
きる新規な射出成形機における原料供給装置を提
供することにある。(Problem that the invention aims to solve) This invention was proposed to solve the above-mentioned problems, and its purpose is to make the supply of raw materials more stable. An object of the present invention is to provide a raw material supply device for a new injection molding machine.
（問題点を解決するための手段）
すなわち、この考案の射出成形機における原料
供給装置は、送りスクリユが内装されたケーシン
グ前部にホツパからの原料を射出装置の加熱筒内
に供給する投入口が設けられたものにおいて、前
記送りスクリユにおけるねじ山を前記投入口手前
部分までとして該投入口周辺に原料の滞留部を形
成するとともに、該滞留部にその断面積を規定す
る絞り部材を配設したことを特徴とするものであ
る。(Means for Solving the Problem) That is, the raw material supply device for the injection molding machine of this invention has an input port for supplying the raw material from the hopper into the heating cylinder of the injection device in the front part of the casing in which the feed screw is installed. In the feed screw, the thread of the feed screw is extended to a portion in front of the inlet to form a retention area for the raw material around the inlet, and a throttle member is provided in the retention area to define its cross-sectional area. It is characterized by the fact that
（実施例）
以下、この考案の実施例を図面に従つて説明す
る。添付の図面第１図はこの考案の一実施例を示
す原料供給装置および射出装置の断面図、第２図
原料供給装置の拡大断面図、第３図は第２図の３
−３線で切断した端面図、第４図はこの考案の原
料供給装置と従来装置とを対比した実験グラフで
ある。(Example) Hereinafter, an example of this invention will be described according to the drawings. The attached drawings Fig. 1 is a sectional view of a raw material supply device and an injection device showing an embodiment of this invention, Fig. 2 is an enlarged sectional view of the raw material supply device, and Fig. 3 is a sectional view of the material supply device shown in Fig. 2.
FIG. 4 is an end view taken along line -3 and is an experimental graph comparing the raw material supply device of this invention with a conventional device.
第１図に図示したように、この原料供給装置１
０は、ケーシング２０と、原料を移送する送りス
クリユ３０、および絞り部材４０とからなる。 As shown in FIG. 1, this raw material supply device 1
0 consists of a casing 20, a feed screw 30 for transferring raw materials, and a throttle member 40.
ケーシング２０は円筒形状を呈するもので、ホ
ツパ１１から原料ペレツトが供給される供給口２
１と該ケーシング前部下部に射出装置５０の加熱
筒５１内に開口する投入口２３とを備えている。
なお、ケーシング２０のスクリユ３０上方部分に
若干の空間部Ｓが設けられている。 The casing 20 has a cylindrical shape, and has a supply port 2 through which raw material pellets are supplied from the hopper 11.
1 and an input port 23 that opens into the heating cylinder 51 of the injection device 50 at the lower front portion of the casing.
Note that a slight space S is provided in the casing 20 above the screw 30.
送りスクリユ３０は前記ケーシング内に回転自
在に内装され、第２図の拡大図からよりよく理解
されれるように、そのねじ山３１が前記投入口２
３の手前部分まで形成されていて、投入口２３周
辺ではねじ山３１が取除かれている。符号３３は
スクリユの軸部３３を表わす。なお、実施例では
ねじ山３１が取除かれた軸部３３部分の長さL1
は概ねスクリユ３０のねじ径D1とほぼ同じに構
成されている。 The feed screw 30 is rotatably housed within the casing, and as can be better understood from the enlarged view in FIG.
3, and the threads 31 are removed around the input port 23. Reference numeral 33 represents the shaft portion 33 of the screw. In addition, in the example, the length L1 of the shaft portion 33 portion from which the thread 31 has been removed
is approximately the same as the screw diameter D1 of the screw 30.
絞り部材４０は、第２図ならびにその部分端面
図である第３図に図示したように、ケーシング２
０内のスクリユねじ山が取除かれた軸部３３部分
に設置され、その内周壁４１によつてケーシング
２０の断面積を規定するようになつている。な
お、実施例では絞り部材４０の内周壁４１による
絞り径D2はスクリユ３０のねじ径D1よりわずか
に大きく構成されている。 The throttle member 40 is connected to the casing 2 as shown in FIG. 2 and FIG. 3, which is a partial end view thereof.
The screw thread in 0 is installed in the removed shaft portion 33, and its inner circumferential wall 41 defines the cross-sectional area of the casing 20. In the embodiment, the aperture diameter D2 formed by the inner circumferential wall 41 of the aperture member 40 is configured to be slightly larger than the thread diameter D1 of the screw 30.
そして、本考案装置１０においては、第２図に
図示したように、ケーシング２０とスクリユ３０
の軸部３３および絞り部材４０とによつて所望の
断面積を有する原料の滞留部Ｒが形成される。 In the device 10 of the present invention, as shown in FIG.
The shaft portion 33 and the throttle member 40 form a raw material retention portion R having a desired cross-sectional area.
次に、この原料供給装置１０をその作動ととも
にさらに詳しく説明すると、ホツパ供給口２１を
経てスクリユ３０のねじ山３１によつて移送され
てきた、必ずしも一様な密度で送られていない原
料ペレツトは一旦、滞留部Ｒにて溜められること
によつて一様な密度を有するようになる。このよ
うにして滞留部Ｒに溜められて一様な密度となつ
た原料ペレツトは、順次移送されてくる原料ペレ
ツト量に応じて押し出され投入口２３より加熱筒
５１内へ投入され、射出スクリユにより混練、射
出される。 Next, to explain the raw material supply device 10 in more detail along with its operation, the raw material pellets, which are not necessarily fed at a uniform density, are transported by the screw thread 31 of the screw 30 via the hopper supply port 21. Once it is stored in the retention section R, it has a uniform density. The raw material pellets accumulated in the retention section R in this way and having a uniform density are pushed out according to the amount of raw material pellets that are sequentially transferred, are thrown into the heating cylinder 51 through the input port 23, and are then fed into the heating cylinder 51 by the injection screw. Kneaded and injected.
第４図はこの考案の原料供給装置と従来装置と
を対比したグラフである。実験ではポリアセター
ルを用いた。同グラフの縦軸は原料供給量、横軸
は試験回数を表わす。この考案装置の供給量は図
中実線で図示した線図６０で示され、従来装置の
それは図中破線で図示した線図７０で示される。 FIG. 4 is a graph comparing the raw material supply device of this invention with a conventional device. Polyacetal was used in the experiment. The vertical axis of the graph represents the raw material supply amount, and the horizontal axis represents the number of tests. The supply amount of this invented device is shown by a line 60 shown in solid lines in the figure, and that of the conventional device is shown by a line 70 shown in broken lines in the figure.
同グラフより、この考案装置の供給量が従来装
置に比較して格段に安定していることが明らかに
される。その供給量の標準偏差については、従来
装置にあつては5.8072であつたものが、本装置に
あつては1.6236となつた。 The graph reveals that the supply amount of this invented device is much more stable than that of conventional devices. The standard deviation of the supply amount was 5.8072 for the conventional device, but was 1.6236 for the present device.
（効果）
以上図示説明したように、この考案によれば、
原料ペレツトを加熱筒内へ投入する以前に一旦溜
めてその移送密度を平均化するようにしたため安
定した原料ペレツトの供給を実現することが可能
となり、従来装置のように供給量が不安定となる
ことはなくなつた。(Effects) As illustrated and explained above, according to this invention,
Since the raw material pellets are stored once before they are put into the heating cylinder and their transfer density is averaged, it is possible to achieve a stable supply of raw material pellets, which eliminates the instability of the supply amount as with conventional equipment. That thing is gone.
また、この考案による原料の供給形態は、一様
な密度とされた原料ペレツトを押し出しにより自
然に加熱筒内へ投入するようにしたものであるか
ら、従来のようにねじ山の位相によつて該ねじ山
から開放され加熱筒に投入される原料ペレツトの
量が異なつてしまうというおそれは解消される。 In addition, the raw material supply method according to this invention is such that the raw material pellets with uniform density are naturally fed into the heating cylinder by extrusion, so unlike the conventional method, the raw material pellets are fed into the heating cylinder by the phase of the screw thread. The fear that the amount of raw material pellets released from the screw thread and introduced into the heating cylinder will be different is eliminated.
このようにこの考案の原料供給装置は、原料供
給量を格段に安定したものとすることができたも
のであるから、射出量の安定、ひいてはシヨート
シヨツトならびにひけ等の成形不良を防止するこ
とができるなど、その効果は極めて大である。 In this way, the raw material supply device of this invention is able to make the raw material supply amount much more stable, which makes it possible to stabilize the injection amount and prevent molding defects such as short shots and sink marks. The effect is extremely large.
第１図はこの考案の一実施例を示す原料供給装
置と射出装置を表わす断面図、第２図はこの原料
供給装置の断面図、第３図は第２図の３−３線で
切断した端面図、第４図はこの考案の原料供給装
置と従来装置とを対比した実験グラフである。
１０……原料供給装置、１１……ホツパ、２０
……ケーシング、２１……供給口、２３……投入
口、３０……スクリユ、３１……ねじ山、３３…
…軸部、４０……絞り部材、６０……考案装置に
よる供給量、７０……従来装置による供給量、Ｒ
……滞留部。
Fig. 1 is a sectional view showing a raw material supply device and an injection device showing an embodiment of this invention, Fig. 2 is a sectional view of this material supply device, and Fig. 3 is a cross-sectional view taken along line 3-3 in Fig. 2. The end view and FIG. 4 are experimental graphs comparing the raw material supply device of this invention and a conventional device. 10... Raw material supply device, 11... Hopper, 20
...Casing, 21... Supply port, 23... Input port, 30... Screw, 31... Screw thread, 33...
...Shaft portion, 40...Aperture member, 60...Amount supplied by the devised device, 70...Amount supplied by the conventional device, R
...Retention part.
Claims (1)
ツパからの原料を射出装置の加熱筒内に供給する
投入口が設けられたものにおいて、 前記送りスクリユにおけるねじ山を前記投入口
手前部分までとして該投入口周辺に原料の滞留部
を形成するとともに、該滞留部にその断面積を規
定する絞り部材を配設したことを特徴とする射出
成形機における原料供給装置。[Scope of Claim for Utility Model Registration] An input port for supplying the raw material from the hopper into the heating cylinder of the injection device is provided in the front part of the casing in which the feed screw is installed, wherein the thread of the feed screw is inserted into the heating cylinder of the injection device. 1. A raw material supply device for an injection molding machine, characterized in that a raw material retention portion is formed around the input port up to a portion in front of the mouth, and a restricting member for defining the cross-sectional area of the retention portion is disposed in the retention portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4189787U JPH0434005Y2 (en) | 1987-03-20 | 1987-03-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4189787U JPH0434005Y2 (en) | 1987-03-20 | 1987-03-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63148409U JPS63148409U (en) | 1988-09-29 |
| JPH0434005Y2 true JPH0434005Y2 (en) | 1992-08-13 |
Family
ID=30857315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4189787U Expired JPH0434005Y2 (en) | 1987-03-20 | 1987-03-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0434005Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2762343B2 (en) * | 1994-06-13 | 1998-06-04 | 日精樹脂工業株式会社 | Material supply device for injection molding machine |
| JP5823350B2 (en) * | 2012-06-15 | 2015-11-25 | 住友重機械工業株式会社 | Injection molding machine |
-
1987
- 1987-03-20 JP JP4189787U patent/JPH0434005Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63148409U (en) | 1988-09-29 |
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