JPS60242027A - Injection-side oil hydraulic circuit for injection molding machine - Google Patents
Injection-side oil hydraulic circuit for injection molding machineInfo
- Publication number
- JPS60242027A JPS60242027A JP8464984A JP8464984A JPS60242027A JP S60242027 A JPS60242027 A JP S60242027A JP 8464984 A JP8464984 A JP 8464984A JP 8464984 A JP8464984 A JP 8464984A JP S60242027 A JPS60242027 A JP S60242027A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- injection
- circuit
- hydraulic
- pressure control
- 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.)
- Granted
Links
Classifications
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/82—Hydraulic or pneumatic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は射出成形機の射出側油圧回路に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection side hydraulic circuit of an injection molding machine.
（従来技術）
第１図は従来の射出成形機の射出側油圧回路図を示し、
同回路は圧油を供給する油圧ポンプＡ、Ｂと、圧油の供
給経路を切換える電磁切換弁１．２と、圧力を制御する
圧力制御弁３ （サックバック用安全リリーフ弁と射出
ブレーキ用リリーフ弁を兼用）より構成されている。(Prior art) Figure 1 shows a hydraulic circuit diagram on the injection side of a conventional injection molding machine.
The circuit consists of hydraulic pumps A and B that supply pressure oil, an electromagnetic switching valve 1.2 that switches the pressure oil supply path, and a pressure control valve 3 that controls pressure (a safety relief valve for suckback and a relief valve for injection brake). (also serves as a valve).
さて第１図において、電磁切換弁ｌのソレノイドａを励
磁すると、油圧ポンプＡから供給された圧油は、射出シ
リンダ５のＥ室に送り込まれ、射出ラム４が前進して射
出動作が行なわれる。この時電磁切換弁２のソレノイド
ｂが励磁され、Ｄ室の油は電磁切換弁２を通りタンク６
へ戻される。Now, in Fig. 1, when the solenoid a of the electromagnetic switching valve l is energized, the pressure oil supplied from the hydraulic pump A is sent into the E chamber of the injection cylinder 5, and the injection ram 4 moves forward to perform an injection operation. . At this time, solenoid b of the electromagnetic switching valve 2 is energized, and the oil in the D chamber passes through the electromagnetic switching valve 2 to the tank 6.
be returned to.
また高速射出動作中にソレノイドｂを切ると、Ｄ室の油
は圧力制御弁３の所定圧力に制御されてリリーフし、そ
の制御圧力により高速射出に於シする慣性が吸収される
為射出ブレーキがかかる。Also, when solenoid b is turned off during high-speed injection operation, the oil in chamber D is controlled to a predetermined pressure of pressure control valve 3 and relieved, and the control pressure absorbs the inertia caused by high-speed injection, so the injection brake is activated. It takes.
またサックバック動作（樹脂の糸引き防止、ドーリング
防止の為のスクリュ後退勤作）は、電磁切換弁２のソレ
ノイドＣを励磁すると、油圧ポンプＢから供給された圧
油は、圧力制御弁３により所定圧力に制御され、射出シ
リンダのＤ室に送り込まれて射出ラム４が後退、即ちス
クリュ７が後退する。なお、１９は油圧モータ、２９は
スクリュシリンダである。In addition, the suckback operation (screw retraction operation to prevent resin stringing and dolling) is performed when the solenoid C of the electromagnetic switching valve 2 is energized, and the pressure oil supplied from the hydraulic pump B is controlled by the pressure control valve 3. The injection ram 4 is controlled to a predetermined pressure and sent into the D chamber of the injection cylinder, and the injection ram 4 retreats, that is, the screw 7 retreats. Note that 19 is a hydraulic motor, and 29 is a screw cylinder.
しかしながら第１図の油圧回路では、射出動作時に射出
シリンダ５のＤ室の大容量の作動油を電磁切換弁２を通
してタンク６へ戻す必要があり、作動油が電磁切換弁２
を通過時の圧力差を最小限におさえる為、大きな電磁切
換弁が必要となる。However, in the hydraulic circuit shown in FIG. 1, during injection operation, it is necessary to return a large amount of hydraulic oil in the D chamber of the injection cylinder 5 to the tank 6 through the electromagnetic switching valve 2.
In order to minimize the pressure difference when passing through, a large electromagnetic switching valve is required.
また射出ブレーキ時、Ｄ室の大容量の作動油が圧力制御
弁３を通過する時、又はその際装置の破損事故につなが
る様な異常圧が発生するのを防ぐ為、大きな圧力制御弁
が必要となる。一般的にサックバンク速度は、射出速度
にくらべ遅い為、必要油量も少ない。従って圧力制御弁
３は小さな・もので良い。同様にサックバンク動作のみ
で考えれば、電磁切換弁２も小さなバルブで゛良いこと
になるが、第１図の従来の回路では射出動作に対応した
大きな圧力制御弁、電磁切換弁が必要となっている。Also, during injection braking, when a large volume of hydraulic oil in the D chamber passes through the pressure control valve 3, a large pressure control valve is required to prevent abnormal pressure from occurring that could lead to equipment damage. becomes. Generally, the sack bank speed is slower than the injection speed, so the amount of oil required is also smaller. Therefore, the pressure control valve 3 may be small. Similarly, if we consider only the suck bank operation, a small valve would be sufficient for the electromagnetic switching valve 2, but in the conventional circuit shown in Fig. 1, a large pressure control valve and electromagnetic switching valve corresponding to the injection operation are required. ing.
（発明が解決しようとする問題点）
本発明は従来回路の欠点を改良し、射出時の速度切換え
（高速から低速）の位置精度を向上させ、成形品の不良
率を低減すると共に、高速射出に対応可能とする為の回
路構成を提供することを目的とするものである。(Problems to be Solved by the Invention) The present invention improves the shortcomings of the conventional circuit, improves the positional accuracy of speed switching (from high speed to low speed) during injection, reduces the defective rate of molded products, and The purpose of this invention is to provide a circuit configuration that can be used to support the following.
（問題点を解決するための手段）
本発明は前記の目的を達成するために、第１、第２油圧
ポンプより射出シリンダのり、Ｅ室に夫々圧油を供給す
る第１、第２油圧回路を有し、かつ同各回路上に夫々第
１、第２電磁切換弁を備えた射出側油圧回路において、
前記第１油圧回路の第１電磁切換弁とＤ室間の回路上に
通常開のロジックバルブを設けると共に、同ロジックバ
ルブを有する回路と並列する回路を設け、同回路上に、
チェックバルブ及びサックバンク回路用安全リリーフ弁
と射出ブレーキ回路用リリーフ弁を兼用した圧力制御弁
を設けた構成としたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides first and second hydraulic circuits that supply pressure oil from the first and second hydraulic pumps to the injection cylinder and the E chamber, respectively. In an injection side hydraulic circuit having a first and second electromagnetic switching valves on each circuit,
A normally open logic valve is provided on the circuit between the first electromagnetic switching valve and the D chamber of the first hydraulic circuit, and a circuit parallel to the circuit having the logic valve is provided, and on the circuit,
This configuration includes a pressure control valve that serves as a check valve, a safety relief valve for the sack bank circuit, and a relief valve for the injection brake circuit.
（作用）
さて前記構成において、サックバンク動作時は、第１電
磁切換弁のソレノイドを励磁すると、第１油圧ポンプか
ら供給された圧油は、圧力制御弁により所定圧力に制御
され、ロジックバルブが閉じられることにより、チェッ
クバルブを通っ゛て射出シリンダのＤ室に送り込まれ、
射出ラムが後退する。また射出動作時は、第１電磁切換
弁のソレノイドを励磁すると、ロジックバルブへの排出
通路がせばめられて射出シリンダのＤ室に背圧が立ち、
その背圧により射出時の慣性を吸収し、射出ブレーキが
かかる。(Function) In the above configuration, when the solenoid of the first electromagnetic switching valve is energized during suck bank operation, the pressure oil supplied from the first hydraulic pump is controlled to a predetermined pressure by the pressure control valve, and the logic valve is activated. When it is closed, it passes through the check valve and is sent into the D chamber of the injection cylinder.
The injection ram moves back. Also, during injection operation, when the solenoid of the first electromagnetic switching valve is energized, the discharge passage to the logic valve is narrowed and back pressure is created in the D chamber of the injection cylinder.
The back pressure absorbs the inertia during injection and applies the injection brake.
（実施例）
以下本発明の実施例を図面について説明すると、第２図
は本発明の実施例を示す射出成形機の射出側油圧回路図
であり、同回路は圧油を供給する油圧ポンプＡ、Ｂと、
圧油の供給経路を切換える電磁切換弁１．１２と供給油
の圧力を制御する圧力制御弁１３ （サックバンク回路
用安全リリーフ弁と射出ブレーキ回路用リリーフ弁を兼
用）、逆流を防止するチェックバルブ１４、大容量作動
油を吸引流出させる通常開型ロジックバルブ１５から構
成されている。(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Fig. 2 is a hydraulic circuit diagram on the injection side of an injection molding machine showing an embodiment of the present invention, and the circuit is connected to a hydraulic pump A that supplies pressure oil. ,B and
Electromagnetic switching valve 1.12 that switches the pressure oil supply route, pressure control valve 13 that controls the pressure of the supply oil (combined as a safety relief valve for the sack bank circuit and a relief valve for the injection brake circuit), and a check valve that prevents backflow. 14. Consists of a normally open type logic valve 15 that sucks in and drains a large amount of hydraulic oil.
ここで第２図の実施例について作用を説明する。Here, the operation of the embodiment shown in FIG. 2 will be explained.
先ず電磁切換弁１のソレノイドａを励磁すると、油圧ポ
ンプＡから供給された圧油は、射出シリンダ５のＥ室に
送り込まれ、射出ラム４が前進して射出動作が行なわれ
る。この時射出シリンダ５のＤ室の油は、通常開型ロジ
ックバルブ１５よりタンク１６に戻される。First, when the solenoid a of the electromagnetic switching valve 1 is energized, the pressure oil supplied from the hydraulic pump A is sent into the E chamber of the injection cylinder 5, and the injection ram 4 moves forward to perform an injection operation. At this time, the oil in the D chamber of the injection cylinder 5 is returned to the tank 16 through the normally open logic valve 15.
またサックバンク動作時は、電磁切換弁１２のソレノイ
ドｄを励磁すると、油圧ポンプＢから供給された圧油は
圧力制御弁１３により所定圧力に制御され、ロジックバ
ルブ１５のポペット１７を押し上げ、開口１８を閉じて
タンクラインを綴じると共に、チェックバルブ１４を通
って射出シリンダ５のＤ室に送り込まれ、射出ラム４が
後退する（射出ラム４とスクリュ７は連結されている為
、スクリュ７が後退することになる）。更に前記射出動
作時に、電磁切換弁１２のソレノイドｄを励磁すると、
ロジックバルブ１５のポペット１７が押し上げられてＤ
室とタンク１６の通路がせばめられる為、Ｄ室に背圧が
立ち、その背圧により射小時の慣性を吸収し、射出ブレ
ーキがかかる。During suck bank operation, when the solenoid d of the electromagnetic switching valve 12 is energized, the pressure oil supplied from the hydraulic pump B is controlled to a predetermined pressure by the pressure control valve 13, pushing up the poppet 17 of the logic valve 15 and pushing up the opening 18. At the same time, it is sent through the check valve 14 into the D chamber of the injection cylinder 5, and the injection ram 4 moves back (because the injection ram 4 and the screw 7 are connected, the screw 7 moves back). ). Furthermore, when the solenoid d of the electromagnetic switching valve 12 is energized during the injection operation,
Poppet 17 of logic valve 15 is pushed up and D
Since the passage between the chamber and the tank 16 is narrowed, a back pressure is created in the D chamber, which absorbs the inertia during firing and applies the injection brake.
（発明の効果）
以上詳細に説明した如く本発明は、通常開型ロジックバ
ルブと、サックバンク回路用安全リリーフ弁と射出ブレ
ーキ回路用リリーフ弁を兼用したバランスドピストンタ
イプのリリーフ弁よりなる圧力制御弁を設けたため、万
一電磁切換弁のソレノイドが励磁されている状態で、射
出動作を行なった場合でも、射出シリンダのＤ室の圧力
が一定以上上がると、ロジックバルブのポペットが開Φ
方向へ押されてＤ室の油がタンクへ戻される為、射出の
安全回路（最高圧力規制）が構成される。(Effects of the Invention) As explained in detail above, the present invention provides pressure control using a normally open type logic valve and a balanced piston type relief valve that also serves as a safety relief valve for the suck bank circuit and a relief valve for the injection brake circuit. Because a valve is provided, even if an injection operation is performed while the solenoid of the electromagnetic switching valve is energized, if the pressure in the D chamber of the injection cylinder rises above a certain level, the poppet of the logic valve will open.
Since the oil in chamber D is returned to the tank by being pushed in this direction, a safety circuit for injection (maximum pressure regulation) is constructed.
また通常開型ロジックバルブを使用することにより、圧
力制御弁及び電磁切換弁は小さなバルブ（サックバック
動作に必要な油量を制御出来れば良い為）で構成出来る
。従ってロジックバルブ、チェックバルブ、圧力制御弁
、第１電磁切換弁を１体化（２点鎖線Ｆ内）することで
、装置の小型化、簡素化を図ることができる。Furthermore, by using a normally open type logic valve, the pressure control valve and electromagnetic switching valve can be configured with small valves (as long as they can control the amount of oil required for suckback operation). Therefore, by integrating the logic valve, check valve, pressure control valve, and first electromagnetic switching valve (inside the two-dot chain line F), the device can be made smaller and simpler.
第１図は従来の射出成形機における射出側油圧回路図、
第２図は本発明の実施例を示す射出成形機の射出側油圧
回路図である。
図の主要部分の説明
Ａ−・−第２油圧ポンプ
Ｂ＝−第１油圧ポンプ
１−第２電磁切換弁
４−射出ラム ５−射出シリンダ
７−スクリュ １２−第ｉ電磁切換弁
１３−圧力制御弁 １４〜チェックバルブ１５− ロジ
ックバルブ
１６− タンク １７−ボベノト
特許出願人 三菱重工業株式会社
同 中菱エンジニアリング
株式会社Figure 1 is an injection side hydraulic circuit diagram of a conventional injection molding machine.
FIG. 2 is an injection side hydraulic circuit diagram of an injection molding machine showing an embodiment of the present invention. Description of the main parts of the figure A - - Second hydraulic pump B = - First hydraulic pump 1 - Second electromagnetic switching valve 4 - Injection ram 5 - Injection cylinder 7 - Screw 12 - i-th electromagnetic switching valve 13 - Pressure control Valve 14 - Check valve 15 - Logic valve 16 - Tank 17 - Bobenoto patent applicant Mitsubishi Heavy Industries, Ltd. Chuubishi Engineering Co., Ltd.
Claims (1)
々圧油を供給する第１、第２油圧回路を有し、かつ同各
回路上に夫々第１、第２電磁切換弁を備えた射出側油圧
回路において、前記第１油圧回路の第１電磁切換弁とＤ
室間の回路上に通常開のロジックバルブを設けると共に
、同ロジンクハルブを有する回路と並列する回路を設け
、同回路上に、チェックバルブ及びす・ツクバック回路
用安全リリーフ弁と射出ブレーキ回路用リリーフ弁を兼
用した圧力制御弁を設けたことを特徴とする射出成形機
の射出側油圧回路。It has first and second hydraulic circuits that supply pressure oil from the first and second hydraulic pumps to chambers D and E of the injection cylinder, respectively, and has first and second electromagnetic switching valves on each circuit, respectively. In the injection side hydraulic circuit, the first electromagnetic switching valve of the first hydraulic circuit and D
A normally open logic valve is installed on the circuit between the rooms, and a circuit parallel to the circuit with the same logic valve is installed, and a check valve, a safety relief valve for the stop-back circuit, and a relief valve for the injection brake circuit are installed on the same circuit. An injection-side hydraulic circuit for an injection molding machine, characterized by being provided with a pressure control valve that also serves as a pressure control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8464984A JPS60242027A (en) | 1984-04-26 | 1984-04-26 | Injection-side oil hydraulic circuit for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8464984A JPS60242027A (en) | 1984-04-26 | 1984-04-26 | Injection-side oil hydraulic circuit for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60242027A true JPS60242027A (en) | 1985-12-02 |
| JPH0433618B2 JPH0433618B2 (en) | 1992-06-03 |
Family
ID=13836550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8464984A Granted JPS60242027A (en) | 1984-04-26 | 1984-04-26 | Injection-side oil hydraulic circuit for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60242027A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988000519A1 (en) * | 1986-07-24 | 1988-01-28 | Fanuc Ltd | Suck-back method in an injection molding machine |
| JPS63166512A (en) * | 1986-12-27 | 1988-07-09 | Meiki Co Ltd | Injection molding machine for molding disk |
| KR20020082970A (en) * | 2001-04-24 | 2002-11-01 | 강출성 | Pulp-mold hydraulic system |
-
1984
- 1984-04-26 JP JP8464984A patent/JPS60242027A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988000519A1 (en) * | 1986-07-24 | 1988-01-28 | Fanuc Ltd | Suck-back method in an injection molding machine |
| US4812268A (en) * | 1986-07-24 | 1989-03-14 | Fanuc Ltd. | Suckback method and apparatus in an injection molding machine |
| JPS63166512A (en) * | 1986-12-27 | 1988-07-09 | Meiki Co Ltd | Injection molding machine for molding disk |
| KR20020082970A (en) * | 2001-04-24 | 2002-11-01 | 강출성 | Pulp-mold hydraulic system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0433618B2 (en) | 1992-06-03 |
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