JP3516121B2 - How to raise the operating oil temperature in the overhead tank - Google Patents
How to raise the operating oil temperature in the overhead tankInfo
- Publication number
- JP3516121B2 JP3516121B2 JP18311197A JP18311197A JP3516121B2 JP 3516121 B2 JP3516121 B2 JP 3516121B2 JP 18311197 A JP18311197 A JP 18311197A JP 18311197 A JP18311197 A JP 18311197A JP 3516121 B2 JP3516121 B2 JP 3516121B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- tank
- mold clamping
- overhead tank
- hydraulic oil
- 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 - Fee Related
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は射出成形機の運転開始前
に作動油を射出成形に適した温度に上昇させる油昇温方
法に係わり、特に型締シリンダに取付けたオーバヘッド
タンク内の作動油昇温方法に関する。
【０００２】
【従来技術】従来から射出成形機の運転開始前に作動油
の温度をヒータやポンプロードにより油タンク内の作動
油の温度を上昇させ、その作動油によって型締シリンダ
およびピストン等の成形機の油圧装置を作動し、作動油
と油圧装置自体を射出成形に適した温度に上昇させる油
昇温方法が行われており、成形運転時には型締装置の型
締シリンダ、射出装置における射出シリンダ等は前述の
油昇温方法に因って昇温された作動油が作用するように
してある。
【０００３】しかしながら、図２のような型締時に型締
シリンダへのプレフィルを目的として型締シリンダに取
付けたオーバヘッドタンク内の作動油はヒータやポンプ
ロードにより昇温された油タンク内の作動油が直接に作
用しないようになっている。
【０００４】即ち、型締シリンダ１に取付けられたオー
バヘッドタンク２内の作動油３は油タンク４内の作動油
５と直接繋がってなく, 油圧ポンプ６或いは図示してな
いヒータにより昇温された作動油５が型締シリンダ１お
よび移動金型７を設けた移動ダイプレート８を取付けた
型締ラム９、ブーストラム１０に作用し、成形運転に適
した温度となるが、オーバヘッドタンク２内の作動油３
は冷えたままである。
【０００５】これを昇温するためには電磁切換弁１１お
よび１２を励磁させるとともに、電磁切換弁１３のｂ位
置を励磁させ、プレフィルバルブ１４を開き、型締シリ
ンダ１の前進側油室１５とオーバヘッドタンク２を連通
させ、型締ラム９を進退させ前進側油室１５内に入った
昇温された作動油５とオーバヘッドタンク２内の作動油
３を前進側油室１５およびオーバヘッドタンク２内を行
ったり来りさせて両作動油３および５を均一化させる
か、或いは昇温のためだけにオーバヘッドタンク２内を
循環するポンプ回路或いはヒータを設けなければならな
かった。
【０００６】
【発明が解決しょうとする課題】従って、前者において
は一度上がった油温は下がってしまい、改めて昇温し直
さなければならなかったし、後者においては配管の複雑
さ、余分な部材を取付けるための価格の上昇という欠点
があった。
【０００７】本発明の目的は前述のような従来の欠点を
取除き、簡単でしかも安価なオーバヘッドタンク内の作
動油を昇温させる方法を提供することにある。
【０００８】
【課題を解決するための手段】前述の目的を達成するた
め本発明は、型締時に型締シリンダへのプレフィルを目
的として型締シリンダにプレフィルバルブを介して取付
けたオーバヘッドタンク内の作動油昇温方法において、
油圧ポンプから吐出される作動油を型締シリンダへの型
締昇圧回路より型締シリンダを介してプレフィルバル
ブ、オーバヘッドタンク、次いでこのオーバヘッドタン
クに設けたオーバフロー用回路から油タンクへ循環させ
ることを特徴としたオーバヘッドタンク内の作動油昇温
方法とした。
【０００９】このような本発明によれば、昇温された油
タンク内の作動油は型締シリンダへの型締昇圧回路より
型締シリンダを経て、プレフィルバルブ−オーバヘッド
タンク−オーバフロー回路−油タンクの順に流れ、オー
バヘッドタンク内の作動油が油タンク内の作動油で置換
えることが可能となった。
【００１０】
【００１１】
【発明の実施の形態】図１により本発明の１実施形態例
を説明する。説明に当たり、本発明は従来のオーバヘッ
ドタンクにオーバフローした作動油が油タンクへ戻る回
路を設けたものであるから前述の従来例で用いた同一部
材は同一符号を付し、その説明を省き、新たに追加した
部材にのみ新番号を付して、その説明をする。オーバヘ
ッドタンク２には太く、オーバヘッドタンク２上部の空
気と一緒にオーバフローした作動油を油タンク４に戻す
オーバフロー用回路２０を設ける。
【００１２】これにより、油圧ポンプ６から吐出される
作動油５を電磁切換弁１２の左室−電磁切換弁１１の右
室−型締シリンダ１の前進用油室１５へ作用させる型締
昇圧回路により、次いで電磁切換弁１３のｂ位置が励磁
されることにより開口状態にあるプレフィルバルブ１４
を通ってオーバヘッドタンク２内へ入り、ここでオーバ
フローすると、オーバフロー用回路２０を介して油タン
ク４へ戻るようになっている。
【００１３】
【発明の効果】以上説明したような構成および作用動作
が行われ、油圧ポンプから吐出される昇温された作動油
を型締シリンダへの型締昇圧回路より型締シリンダを介
してプレフィルバルブ、オーバヘッドタンク、次いでオ
ーバフロー用回路から油タンクへ循環させ、オーバヘッ
ドタンク内の作動油を簡単でしかも安価に昇温させるこ
とが可能となった。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for raising the temperature of hydraulic oil to a temperature suitable for injection molding before starting the operation of an injection molding machine, and more particularly to a mold clamping method. The present invention relates to a method for raising the temperature of hydraulic oil in an overhead tank mounted on a cylinder. 2. Description of the Related Art Conventionally, before starting operation of an injection molding machine, the temperature of hydraulic oil in an oil tank is increased by a heater or a pump load, and the hydraulic oil is used to increase the temperature of a mold clamping cylinder and a piston. An oil heating method that operates the hydraulic device of the molding machine and raises the hydraulic oil and the hydraulic device itself to a temperature suitable for injection molding is performed. During the molding operation, the injection of the mold clamping cylinder of the mold clamping device and the injection device is performed. The cylinders and the like are made to work with the hydraulic oil whose temperature has been raised by the above-mentioned oil temperature raising method. However, the hydraulic oil in the overhead tank attached to the mold clamping cylinder for the purpose of prefilling the mold clamping cylinder at the time of mold clamping as shown in FIG. 2 is the hydraulic oil in the oil tank heated by a heater or a pump load. Does not work directly. That is, the hydraulic oil 3 in the overhead tank 2 attached to the mold clamping cylinder 1 is not directly connected to the hydraulic oil 5 in the oil tank 4 and is heated by the hydraulic pump 6 or a heater (not shown). The hydraulic oil 5 acts on the mold clamping ram 9 and the boost ram 10 to which the movable die plate 8 provided with the mold clamping cylinder 1 and the movable mold 7 is attached, and the temperature becomes suitable for the molding operation. Hydraulic oil 3
Is still cold. In order to raise the temperature, the electromagnetic switching valves 11 and 12 are excited, the position b of the electromagnetic switching valve 13 is excited, the prefill valve 14 is opened, and the forward oil chamber 15 of the mold clamping cylinder 1 is opened. And the overhead tank 2, the mold clamping ram 9 is moved forward and backward, the heated hydraulic oil 5 in the forward oil chamber 15 and the hydraulic oil 3 in the overhead tank 2 are transferred to the forward oil chamber 15 and the overhead tank 2. In order to make the two working oils 3 and 5 uniform by moving back and forth, or to provide a pump circuit or a heater that circulates in the overhead tank 2 only for raising the temperature. [0006] Accordingly, in the former, the oil temperature which once rises decreases, and the temperature must be increased again. In the latter, the complexity of piping and extra members are increased. However, there is a disadvantage that the price for mounting is increased. SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and inexpensive method for raising the temperature of hydraulic oil in an overhead tank, eliminating the above-mentioned disadvantages of the prior art. In order to achieve the above-mentioned object, the present invention provides a method of mounting a mold clamping cylinder via a prefill valve for the purpose of prefilling the mold clamping cylinder at the time of mold clamping. In the method of raising the operating oil temperature in the overhead tank,
The hydraulic oil discharged from the hydraulic pump through a die clamping cylinder from the mold clamping step-up circuit to the mold clamping cylinder prefill valve, overhead tank, then this overhead Tan
The hydraulic oil temperature in the overhead tank is circulated from the overflow circuit provided in the oil tank to the oil tank. According to the present invention, the operating oil in the oil tank whose temperature has been raised passes through the mold clamping cylinder from the mold clamping boosting circuit to the mold clamping cylinder, passes through the prefill valve, the overhead tank, the overflow circuit, and the oil. The oil flows in the order of the tank, and the hydraulic oil in the overhead tank can be replaced with the hydraulic oil in the oil tank. [0010] [0011] By PREFERRED EMBODIMENTS Figure 1 illustrating one embodiment of the present invention. In the description, the present invention is provided with a circuit for returning the hydraulic oil overflowing to the conventional overhead tank to the oil tank. Therefore, the same members used in the above-described conventional example are denoted by the same reference numerals, and the description thereof will be omitted. Only the members added to are added with new numbers and will be described. The overhead tank 2 is provided with an overflow circuit 20 for returning the hydraulic oil, which is thick and overflows together with the air above the overhead tank 2, to the oil tank 4. Thereby, the hydraulic pump 5 discharged from the hydraulic pump 6 acts on the left chamber of the electromagnetic switching valve 12, the right chamber of the electromagnetic switching valve 11, and the forward oil chamber 15 of the mold clamping cylinder 1. Then, the b-position of the electromagnetic switching valve 13 is excited, so that the prefill valve 14 which is in the open state is opened.
Through the overflow tank 20 and returns to the oil tank 4 via the overflow circuit 20. [0013] Configuration and operation operates as described above, according to the present invention is performed, via the clamping cylinder from the mold clamping step-up circuit of elevated hydraulic fluid discharged to the mold clamping cylinder from the hydraulic pump < Then, the oil is circulated from the prefill valve, the overhead tank, and then from the overflow circuit to the oil tank, so that the temperature of the hydraulic oil in the overhead tank can be raised easily and at low cost.
【図面の簡単な説明】
【図１】本発明の一実施例を示すオーバヘッドタンク式
の型締装置の制御回路の図。
【図２】従来のオーバヘッドタンク式の型締装置の制御
回路の図。
【符号の説明】
１ 型締シリンダ
２ オーバヘッドタンク
３ オーバヘッドタンク内作動油
４ 油タンク
５ 油タンク内作動油
６ 油圧ポンプ
７ 移動金型
８ 移動ダイプレート
９ 型締ラム
１０ ブーストラム
１１ 電磁切換弁
１２ 電磁切換弁
１３ 電磁切換弁
１４ プレフィルバルブ
１５ 前進側油室
２０ オーバフロー用回路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a control circuit of an overhead tank type mold clamping device according to an embodiment of the present invention. FIG. 2 is a diagram of a control circuit of a conventional overhead tank type mold clamping device. [Description of Signs] 1 Mold Cylinder 2 Overhead Tank 3 Hydraulic Oil in Overhead Tank 4 Oil Tank 5 Hydraulic Oil in Oil Tank 6 Hydraulic Pump 7 Moving Die 8 Moving Die Plate 9 Mold Clamp Ram 10 Boost Ram 11 Solenoid Switching Valve 12 Electromagnetic switching valve 13 Electromagnetic switching valve 14 Prefill valve 15 Forward oil chamber 20 Overflow circuit
Claims (1)
目的として型締シリンダにプレフィルバルブを介して取
付けたオーバヘッドタンク内の作動油昇温方法におい
て、油圧ポンプから吐出される作動油を型締シリンダへ
の型締昇圧回路より型締シリンダを介してプレフィルバ
ルブ、オーバヘッドタンク、次いでこのオーバヘッドタ
ンクに設けたオーバフロー用回路から油タンクへ循環さ
せることを特徴としたオーバヘッドタンク内の作動油昇
温方法。(57) [Claims] [Claim 1] Hydraulic oil in an overhead tank mounted on a mold clamping cylinder via a prefill valve for the purpose of prefilling the mold clamping cylinder at the time of mold clamping. in temperature method, the hydraulic oil discharged from the hydraulic pump through a die clamping cylinder from the mold clamping step-up circuit to the mold clamping cylinder prefill valve, overhead tank, then this overhead data
A method for raising the temperature of hydraulic oil in an overhead tank, wherein the oil is circulated from an overflow circuit provided in the tank to an oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18311197A JP3516121B2 (en) | 1997-06-24 | 1997-06-24 | How to raise the operating oil temperature in the overhead tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18311197A JP3516121B2 (en) | 1997-06-24 | 1997-06-24 | How to raise the operating oil temperature in the overhead tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1110697A JPH1110697A (en) | 1999-01-19 |
| JP3516121B2 true JP3516121B2 (en) | 2004-04-05 |
Family
ID=16129977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18311197A Expired - Fee Related JP3516121B2 (en) | 1997-06-24 | 1997-06-24 | How to raise the operating oil temperature in the overhead tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3516121B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100903704B1 (en) * | 2007-10-01 | 2009-06-19 | 대한민국 | The White and Brown Rice Appearance Characteristics Measurement System and the Same Method |
| JP5199990B2 (en) * | 2009-12-17 | 2013-05-15 | 日精樹脂工業株式会社 | Molding machine hydraulic oil temperature raising method |
| CN104690932A (en) * | 2015-01-29 | 2015-06-10 | 成都绿迪科技有限公司 | Rubber corner jointing machine hydraulic control system |
| CN104943102A (en) * | 2015-05-26 | 2015-09-30 | 宁波双盛塑料机械有限公司 | Mold assembling device for injection molding machine |
| CN105522702A (en) * | 2015-11-20 | 2016-04-27 | 徐金龙 | Mold locking force of forming machine |
-
1997
- 1997-06-24 JP JP18311197A patent/JP3516121B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1110697A (en) | 1999-01-19 |
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