JP3196144B2 - Mold clamping devices such as injection molding machines - Google Patents
Mold clamping devices such as injection molding machinesInfo
- Publication number
- JP3196144B2 JP3196144B2 JP01853492A JP1853492A JP3196144B2 JP 3196144 B2 JP3196144 B2 JP 3196144B2 JP 01853492 A JP01853492 A JP 01853492A JP 1853492 A JP1853492 A JP 1853492A JP 3196144 B2 JP3196144 B2 JP 3196144B2
- Authority
- JP
- Japan
- Prior art keywords
- mold clamping
- oil
- mold
- piston
- cylinder
- 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
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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
- B29C45/6764—Mould opening, closing or clamping devices hydraulic using hydraulically connectable chambers of the clamping cylinder during the mould opening and closing movement
- B29C45/6771—Mould opening, closing or clamping devices hydraulic using hydraulically connectable chambers of the clamping cylinder during the mould opening and closing movement the connection being provided within the clamping cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- 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等の型締装置
に関する。
【0002】
【従来技術】図3により従来装置を説明すると、1は型
締シリンダで主ラム2を内径面に摺動自在に装着し、油
室3および4に作用する圧油により先端に固着した移動
金型取付用の移動プレート5を図示しない固定金型取付
用の固定プレートに対しストロークsだけ進退させるよ
うになっている。6はプレフィルバルブで油タンク7と
油室4の間に有り通常はバネ8により油室4と油タンク
7の間の連絡口9を閉じているが、型締めに際し、主ラ
ム2が前進(図中右行する)したとき負圧状態になった
油室4に大容量の作動油を油タンク7から吸い込むよう
に弁開用室10へ圧油が作用し、前記バネ8の押圧力に
逆らって前記連絡口9を開くようになっている。11は
ブースタラムで軸方向に貫通孔12が設けてあり、外部
からの圧油が主ラム2内に有るシリンダ13に導かれる
ようになっている。14は押出シリンダで押出プレート
15に取付けた押出ピン16が取付けてあり、製品を成
形した後の型開に際し、所定距離tだけ作動し、金型内
の成形品を突出すようにしている。
【0003】前述のように構成されているので型開閉動
作に際し、大容量の作動油が油タンク7と型締めシリン
ダ1との間を往来するためサイクルが長いこと、型締シ
リンダ1の後方にプレフィルバルブ6が取付けてあるこ
と、さらに前方には押出シリンダ14が取付けてあるこ
とで装置全体の長さLが長いこと、型締ラム2が複胴式
のため複雑で型締シリンダの加工が面倒である等の欠点
があった。
【0004】これらの欠点を取り除くため特公昭55−
24986号公報に記載されている装置が知られてい
る。この装置について図4により説明すると、表裏の圧
力作用面積をほヾ等しく形成するため表裏に夫々同径の
ロッド20、21を取付けた加圧ラム22を摺動自在に
嵌挿したシリンダ23の室24および25に加圧ラム2
2の前進、後退に応じてシリンダ23内の媒体(油)を
加圧ラム22に設けた貫通孔26を介して移流させ、ロ
ッド20の先端に取付けた移動金型取付用移動プレート
27を進退させるようにし、型閉後の昇圧に際してはロ
ッド21の先端に取付けたシリンダ28により弁29を
前記貫通孔26に押付けて塞ぎ、室25に圧油を作用さ
せるようにしている。
【0005】この装置はブースタ装置30を型締シリン
ダ23の外部に出してあり、従来装置と比べて型締シリ
ンダ23の加工も容易になり、作動油もシリンダの両室
24および25の間を行来し、大容量の作動油が油タン
クと型締めシリンダとの間を往来しなくなったものの、
表裏の圧力作用面積をほヾ等しく形成するということか
ら加圧ラム22には、後退側にロッド21が取付けてあ
り、移動プレート27の後退時には鎖線で示すようにロ
ッド21がストロークsだけ後方へ突出ることになり装
置の長さLは依然として長く、さらにロッド20の径も
型締シリンダとの関係から太径とするには制限があり、
従って移動プレート27の中央付近に型締力が集中する
という欠点があった。
【0006】本発明の目的は前述の欠点を取除き、構造
が簡単で、装置の長さも短縮でき、しかも移動プレート
の中央付近に型締力が集中することのない射出成形機等
の型締装置を提供することにある。
【0007】
【発明が解決しょうとする問題点】前述の目的を達成す
るため、本発明はピストンを内径面に摺動自在に嵌着
し、一端に移動金型取付用の移動プレートを取付た型締
シリンダと、型締シリンダの他端面に対向してフレーム
等に型締方向に対して垂直に固定された連結プレート
と、一端が前記連結プレートに片持状態で固着され、他
端の自由端が型締シリンダの内径面に液蜜に嵌挿され、
型締シリンダ内を前進、後退用油室に分けるとともに、
両室を連絡する貫通孔を有すピストンを形成した型締ピ
ストンと、連結プレートと移動プレートの間に前記型締
シリンダと並列に設けられ、型開閉に際し移動プレート
を進退させるブーストシリンダと、前記型締ピストの他
端に摺動自在に取り付けられ、型締ピストンに設けた油
路を介して導かれた圧油および型締シリンダ前進用室内
の油圧により前記ピストンに形成された貫通孔を開閉す
るプレフィルバルブとを有することを特徴とする射出成
形機等の型締装置とした。
【0008】
【作用】型開閉の際、ブーストシリンダにより移動プレ
ートを進退させることによりシリンダ内の前進用油室お
よび後退用油室の間に型締シリンダ内の作動油をピスト
ンに設けた貫通孔を介して移流させ、昇圧に対してはプ
レフィルバルブにより前記貫通孔を塞いだ後、型締シリ
ンダの前進用油室を介して圧油を作用させる。
【0009】
【実施例】図1および図2により本発明の1実施例を説
明すると、50は図示してないフレーム等に型締方向に
垂直に固定された連結プレ−トで、型締ピストン51の
一端を片持状態で固着している。前記型締ピストンの自
由端である他端はピストン52が形成されていて、型締
シリンダ53の内径面に液密に挿着され、型締シリンダ
内を前進用油室54および後退用油室55に分けるとと
もに、前記両油室54および55はピストン52に設け
た貫通孔56を介して、油室54および55内の作動油
を互いに移流することができるようになっている。前記
型締シリンダ53は前記型締ピストン51の他端のピス
トン52にストロ−クSだけ摺動自在に嵌着されてい
て、反連結プレ−ト側の端部には移動金型取付用の移動
プレ−ト57が取付けられているので、図示してない固
定金型を取付た固定プレ−トに対し、型開閉を行うよう
になっている。
【0010】また型締ピストン51のピストン52の先
端側には前記貫通孔56を開閉するプレフィルバルブ5
8が摺動自在に取付けられていて、移動プレ−ト57の
前進、後退時には、前記油室54および55の間を作動
油が移流できるよう図1に示すように型締ピストン51
に設けた導油孔59を介して型締ピストン51とプレフ
ィルバブル58の間に形成された弁室60に作用する圧
油により貫通孔56を開き、型閉じ後の昇圧に際しては
図2に示すように貫通孔56を閉じるようになってい
る。
【0011】61はブ−ストシリンダで、連結プレ−ト
50と移動プレ−ト57の間に型締シリンダ53と並列
に設けてあり、移動プレ−ト57の前進、後退に際して
は油室62および63に作用する圧油により移動プレ−
ト57がより早い移動が出来るようになっている。
【0012】64は可変ポンプ65から吐出される圧油
を型締シリンダの油室54および55へ作用させ、移動
プレ−ト57を進退させるとともに型閉じ後の昇圧を行
い、同時にプレフィルバルブ58の弁室60に圧油を作
用させプレフィルバルブ58の開閉制御を行う電磁切換
弁である。66は可変ポンプ65からの吐出油のパイロ
ット圧力で主スプル66Aを切換えるパイロット付電磁
切換弁で電磁切換弁67と協働し、可変ポンプ68から
吐出する圧油によりブ−ストシリンダ61の進退を制御
するものである。
【0013】69および70はパイロット付チェック弁
で、油室54および55とタンク71の間にあって、パ
イロット圧が作用する場合には、油室54および55と
タンク71の間は圧油の通過が可能でパイロット圧が作
用しない場合は、その管路は閉じられるようになってい
る。
【0014】72は前記パイロット付電磁切換弁66の
パイロット回路73内に設けたカムバルブで、鎖線で示
す安全扉が図示した運転位置(閉じ状態にある)から開
かれると(図中左行する)図示した下位置から上位置へ
と切換り、パイロット回路73からの圧油がパイロット
付電磁切換弁66の主スプル66Aへ作用しなくなり主
スプル66Aが図示した中間位置となって移動プレ−ト
57を型締方向(図中右行する)へ移動させることが出
来ないようにしている。即ち型閉じが行われないように
して物等、特に人間が型に挟まれないようにしている。
74はブ−ストシリンダ61からの戻り油に抵抗を与
え、移動プレ−ト57を低速で前進されるようにしてい
る絞りである。
【0015】以上のように構成されており、次にその動
作について説明すると、型締に際し、安全扉が閉まりカ
ムバルブ72が図示した位置となり電磁切換弁64がb
位置、パイロット付電磁切換弁66がb位置、電磁切換
弁67がa位置にするとポンプ65から吐出される圧油
が油室60に作用し、プレフィルバルブ58が図示した
ように貫通孔56を開くと同時にチェック弁70に作用
し、ブ−ストシリンダ61の油室62にポンプ68から
の圧油が作用し、ブ−ストシリンダ61は小径のため、
移動プレ−ト57は高速で前進(図中右行する)し、油
室55と油タンク71を連結する管路はチェック弁69
でブロックされているので、型締シリンダ53の油室5
5は圧縮され、油室55内の作動油は貫通孔56を通っ
て前進用油室54へ移流するとともに、負圧ぎみの油室
54へチェック弁70を介して油タンク71から作動油
が吸込まれる。
【0016】移動ダイプレ−ト57の前進限近くになる
と、図示してないリミットスィッチ等により電磁切換弁
67が非励磁になり図示した中間位置となって、可変ポ
ンプ68の吐出油が少量に絞られるとともに、ブ−スト
シリンダ61の油室63からの戻り油は絞り74を介し
てのみ油タンク71へ戻ることになり、移動プレ−ト5
7は低速で前進し、移動ダイプレ−ト57は前進限とな
り金型は閉じられる。
【0017】移動ダイプレ−ト57の前進限で図示して
ないリミットスィッチ等により電磁切換弁64が非励磁
となり図示した位置となると、プレフィルバルブ58の
油室60への圧油の作用が止まり、プレフィルバルブ5
8は型締シリンダ53の油室54内の油圧により貫通孔
56を図2で示すように塞ぐとともに、チェック弁70
へのパイロット圧も負荷されないので、油タンク71へ
の油路も塞がれ、油室54はポンプ65からの吐出油に
より昇圧され、型締が行われる。
【0018】次いで、図示しない射出が行われ、金型内
に製品が成形されると成形品を金型から取出すべく型開
き工程となる。型開きに際しては、大きな型締力が負荷
されたまま急激に移動プレ−ト57を後退させるとショ
ックにより機械が振動したり、成形品にクラック等が生
じるので、先ず、型締圧力の降下が行われる。即ち、電
磁切換弁64がb位置となり、型締シリンダ53の前進
用油室54内の圧油は電磁切換弁64を通って油タンク
71へ抜けると同時にプレフィルバルブ58の油室60
へ圧油が作用し、プレフィルバルブ58は貫通孔56を
開く。
【0019】続いてパイロット付電磁切換弁66はa位
置となり小容量の吐出量とされた可変ポンプ68の吐出
油はブ−ストシリンダ61の油室63に作用し、油室6
2の圧油は電磁切換弁67を通って絞り74を介して油
タンク71へ戻り、同時に型締シリンダ53の油室54
内の作動油は貫通孔56を通って油室55へ移流するの
で移動プレ−ト57は低速で後退し始める。移動ダイプ
レ−ト57が所定距離だけ後退すると、電磁切換弁67
がb位置となり、油室62からの作動油はパイロット付
電磁切換弁66aから電磁切換弁67bを経て油室63
に作用する差動回路となっているので、従って油室63
に作用する圧油により高速度で移動プレ−トは後退す
る。
【0020】移動プレ−ト57が後退限近くになると、
電磁切換弁67が非励磁となり、図示した中間位置にな
り油室63にはポンプ68からの小容量の圧油だけが作
用し移動プレ−ト57は低速度で後退し、型締サイクル
は完了する。以上動作について説明したが、前述の制御
油圧回路はこれに限らずこのような開閉動作を行う回路
であれば他の回路であっても何等支障はない。
【0021】
【発明の効果】本発明は以上に説明したような構成で動
作が行われるので構造が簡単で装置の長さを縮小でき、
しかも移動プレ−トが比較的大径の型締シリンダに取付
けられているので、型締力が移動プレ−ト中央付近に集
中するという欠点も取除かれる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device such as an injection molding machine. 2. Description of the Related Art A conventional apparatus will be described with reference to FIG. 3. Reference numeral 1 denotes a mold clamping cylinder in which a main ram 2 is slidably mounted on an inner diameter surface, and is fixed to a tip end by pressure oil acting on oil chambers 3 and 4. The moving plate 5 for attaching the movable mold is moved forward and backward by a stroke s with respect to a fixed plate for attaching a fixed mold (not shown). Reference numeral 6 denotes a prefill valve which is located between the oil tank 7 and the oil chamber 4 and normally closes the communication port 9 between the oil chamber 4 and the oil tank 7 by means of a spring 8, but the main ram 2 moves forward when closing the mold. The pressure oil acts on the valve opening chamber 10 so that a large volume of hydraulic oil is sucked from the oil tank 7 into the oil chamber 4 that has been in a negative pressure state when the oil chamber 4 is moved to the right (in the right direction in the figure), and the pressing force of the spring 8 is exerted. The communication port 9 is opened. Reference numeral 11 denotes a booster ram provided with a through hole 12 in the axial direction, so that pressure oil from the outside is guided to a cylinder 13 in the main ram 2. Reference numeral 14 denotes an extrusion cylinder to which an extrusion pin 16 attached to an extrusion plate 15 is attached. When the mold is opened after forming the product, the extrusion cylinder operates by a predetermined distance t to project the molded product in the mold. [0003] With the above-described structure, a large amount of hydraulic oil moves between the oil tank 7 and the mold clamping cylinder 1 during the mold opening and closing operation, so that the cycle is long. Since the prefill valve 6 is mounted, and the extrusion cylinder 14 is mounted on the front side, the overall length L of the apparatus is long. However, there was a drawback that it was troublesome. In order to eliminate these disadvantages, Japanese Patent Publication No.
An apparatus described in JP-A-24986 is known. This device will be described with reference to FIG. 4. In order to make the pressure acting areas on the front and back almost equal, a chamber of a cylinder 23 in which a pressure ram 22 having rods 20 and 21 of the same diameter attached to the front and back, respectively, is slidably inserted. Pressure ram 2 on 24 and 25
The medium (oil) in the cylinder 23 is caused to flow through the through-hole 26 provided in the pressurizing ram 22 in accordance with the advance and retreat of the rod 2, and the moving plate 27 for moving the mold attached to the tip of the rod 20 is moved forward and backward. During pressurization after the mold is closed, the valve 29 is pressed against the through-hole 26 by a cylinder 28 attached to the tip of the rod 21 so as to close it, and pressurized oil acts on the chamber 25. In this device, the booster device 30 is provided outside the mold clamping cylinder 23, and the machining of the mold clamping cylinder 23 is facilitated as compared with the conventional device, and the operating oil is supplied between the two chambers 24 and 25 of the cylinder. Came and the large volume of hydraulic oil stopped flowing between the oil tank and the mold clamping cylinder,
The rod 21 is attached to the retreating side of the pressurizing ram 22 because the pressure acting areas on the front and back are formed substantially equal. When the moving plate 27 retreats, the rod 21 moves backward by the stroke s as shown by a chain line. The length L of the device is still long, and the diameter of the rod 20 is limited to be large due to the relationship with the mold clamping cylinder.
Accordingly, there is a disadvantage that the mold clamping force is concentrated near the center of the moving plate 27. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, to simplify the structure, to reduce the length of the apparatus, and to prevent the clamping force from being concentrated near the center of the moving plate. It is to provide a device. [0007] In order to achieve the above object, the present invention has a piston slidably fitted on an inner diameter surface, and a movable plate for mounting a movable mold is mounted at one end. A mold clamping cylinder, a connecting plate opposed to the other end surface of the mold clamping cylinder and fixed to a frame or the like perpendicularly to the mold clamping direction, and one end fixed to the connecting plate in a cantilever state, and the other end free. The end is inserted into the inner surface of the mold clamping cylinder with liquid honey,
The interior of the mold clamping cylinder is divided into forward and backward oil chambers.
A mold-clamping piston having a piston having a through-hole communicating the two chambers, a boost cylinder provided between the connecting plate and the moving plate in parallel with the mold-clamping cylinder, and moving the moving plate forward and backward when the mold is opened and closed; The through-hole formed in the piston is slidably attached to the other end of the mold-fixing piston, and is opened and closed by pressure oil guided through an oil passage provided in the mold-clamping piston and hydraulic pressure in the chamber for moving the mold-clamping cylinder. A mold clamping device such as an injection molding machine characterized by having a prefill valve. When the mold is opened and closed, the moving plate is moved forward and backward by the boost cylinder, so that the hydraulic oil in the mold clamping cylinder is provided in the piston between the forward oil chamber and the backward oil chamber in the cylinder. After pressurizing, the pre-fill valve closes the through-hole, and then pressurized oil is applied via the forward oil chamber of the mold closing cylinder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 50 denotes a connecting plate fixed to a frame or the like (not shown) perpendicularly to a mold clamping direction. One end of 51 is fixed in a cantilever state. The other end, which is the free end of the mold-clamping piston, is formed with a piston 52, which is inserted in a liquid-tight manner into the inner diameter surface of the mold-clamping cylinder 53, and a forward oil chamber 54 and a retreat oil chamber are inserted inside the mold-clamping cylinder. 55, the oil chambers 54 and 55 can transfer hydraulic oil in the oil chambers 54 and 55 to each other through a through hole 56 provided in the piston 52. The mold clamping cylinder 53 is slidably fitted on the piston 52 at the other end of the mold clamping piston 51 by a stroke S, and has an end on the side opposite to the coupling plate for attaching a movable mold. Since the movable plate 57 is attached, the mold is opened and closed with respect to a fixed plate to which a fixed mold (not shown) is attached. A prefill valve 5 for opening and closing the through hole 56 is provided at the tip end of the piston 52 of the mold clamping piston 51.
8 is slidably mounted, and as the moving plate 57 advances and retreats, as shown in FIG.
The through hole 56 is opened by pressure oil acting on the valve chamber 60 formed between the mold clamping piston 51 and the prefill bubble 58 via the oil guide hole 59 provided in the mold, and FIG. As shown, the through hole 56 is closed. Reference numeral 61 denotes a boost cylinder which is provided between the connecting plate 50 and the moving plate 57 in parallel with the mold clamping cylinder 53. When the moving plate 57 moves forward and backward, an oil chamber 62 is provided. Moving press by pressure oil acting on
G can move faster. Numeral 64 designates pressure oil discharged from the variable pump 65 acting on the oil chambers 54 and 55 of the mold clamping cylinder to move the moving plate 57 forward and backward and to increase the pressure after closing the mold. This is an electromagnetic switching valve that controls the opening and closing of the prefill valve 58 by applying pressure oil to the valve chamber 60. Reference numeral 66 denotes a pilot-operated electromagnetic switching valve for switching the main sprue 66A by the pilot pressure of the oil discharged from the variable pump 65, cooperating with the electromagnetic switching valve 67, and moving the boost cylinder 61 forward and backward by the pressure oil discharged from the variable pump 68. To control. The check valves 69 and 70 are provided between the oil chambers 54 and 55 and the tank 71, and are provided between the oil chambers 54 and 55 and the tank 71 when the pilot pressure is applied. If possible and no pilot pressure is applied, the line is closed. Reference numeral 72 denotes a cam valve provided in the pilot circuit 73 of the solenoid-operated directional control valve 66. When the safety door shown by the chain line is opened from the illustrated operating position (in a closed state) (to the left in the figure). The position is switched from the illustrated lower position to the upper position, and the pressure oil from the pilot circuit 73 does not act on the main sprue 66A of the piloted solenoid-operated directional control valve 66, so that the main sprue 66A becomes the illustrated intermediate position and the moving plate 57 moves. Cannot be moved in the mold clamping direction (to the right in the figure). That is, the mold is not closed so that an object or the like, especially a human, is not pinched by the mold.
Reference numeral 74 denotes a throttle which gives resistance to the return oil from the boost cylinder 61 so that the moving plate 57 can be advanced at a low speed. The operation will now be described. When the mold is clamped, the safety door is closed, the cam valve 72 is in the position shown in FIG.
When the position, the pilot-operated electromagnetic switching valve 66 is at the b position, and the electromagnetic switching valve 67 is at the a position, the pressure oil discharged from the pump 65 acts on the oil chamber 60, and the pre-fill valve 58 opens the through hole 56 as shown. At the same time as opening, it acts on the check valve 70, and the pressure oil from the pump 68 acts on the oil chamber 62 of the boost cylinder 61. Since the boost cylinder 61 has a small diameter,
The moving plate 57 moves forward (going right in the figure) at a high speed, and a pipe connecting the oil chamber 55 and the oil tank 71 is a check valve 69.
Oil chamber 5 of the mold clamping cylinder 53
5 is compressed, the hydraulic oil in the oil chamber 55 flows through the through hole 56 to the forward oil chamber 54, and the hydraulic oil from the oil tank 71 through the check valve 70 to the negative pressure oil chamber 54. Inhaled. When the moving diplate 57 is near the forward limit, the electromagnetic switching valve 67 is de-energized by a limit switch (not shown) or the like and becomes the intermediate position shown in the figure, and the discharge oil of the variable pump 68 is reduced to a small amount. At the same time, the return oil from the oil chamber 63 of the boost cylinder 61 returns to the oil tank 71 only through the throttle 74.
7 moves forward at a low speed, and the movable diplate 57 reaches the forward limit, and the mold is closed. When the electromagnetic switching valve 64 is de-energized by a limit switch (not shown) or the like at the limit of the advancement of the moving die plate 57 and reaches the position shown in the figure, the action of the pressure oil on the oil chamber 60 of the prefill valve 58 stops. , Prefill valve 5
8 closes the through hole 56 by the oil pressure in the oil chamber 54 of the mold clamping cylinder 53 as shown in FIG.
Since the pilot pressure to the oil tank 71 is not applied, the oil passage to the oil tank 71 is also closed, and the oil chamber 54 is pressurized by the oil discharged from the pump 65 to perform mold clamping. Next, injection (not shown) is performed, and when a product is formed in the mold, a mold opening process is performed to remove the molded product from the mold. When the mold is opened, if the moving plate 57 is rapidly retracted while a large mold clamping force is being applied, the machine vibrates due to a shock or a crack occurs in a molded product. Done. That is, the electromagnetic switching valve 64 is set to the position b, and the pressure oil in the forward oil chamber 54 of the mold clamping cylinder 53 passes through the electromagnetic switching valve 64 to the oil tank 71, and at the same time, the oil chamber 60 of the prefill valve 58
The pressurized oil acts, and the prefill valve 58 opens the through hole 56. Subsequently, the solenoid-operated switching valve with pilot 66 is set to the position a, and the discharge oil of the variable pump 68, which has a small displacement, acts on the oil chamber 63 of the boost cylinder 61 and the oil chamber 6
2 returns to the oil tank 71 through the throttle 74 through the electromagnetic switching valve 67, and at the same time, the oil chamber 54 of the mold closing cylinder 53.
The moving plate 57 starts to retreat at a low speed because the working oil in the inside flows through the through hole 56 to the oil chamber 55. When the moving plate 57 is retracted by a predetermined distance, the electromagnetic switching valve 67
Moves to the position b, and the hydraulic oil from the oil chamber 62 flows from the pilot-equipped electromagnetic switching valve 66a to the oil chamber 63 through the electromagnetic switching valve 67b.
, So that the oil chamber 63
The moving plate moves backward at a high speed due to the pressure oil acting on the plate. When the moving plate 57 approaches the retreat limit,
The electromagnetic switching valve 67 is de-energized, and moves to the illustrated intermediate position. Only a small amount of pressure oil from the pump 68 acts on the oil chamber 63, the moving plate 57 moves backward at a low speed, and the mold clamping cycle is completed. I do. Although the operation has been described above, the control hydraulic circuit described above is not limited to this, and any other circuit may be used as long as it performs such an opening and closing operation. According to the present invention, since the operation is performed with the above-described configuration, the structure is simple and the length of the apparatus can be reduced.
Moreover, since the moving plate is mounted on a relatively large-diameter mold clamping cylinder, the disadvantage that the clamping force is concentrated near the center of the moving plate is also eliminated.
【図面の簡単な説明】
【図1】本発明の1実施例を示す図で、移動プレ−トが
後退限にある時の図。
【図2】本発明の1実施例を示す図で、移動プレ−トの
前進限で昇圧した時の図。
【図3】従来型締装置の図。
【図4】他の従来例を示す型締装置の図。
【符号の説明】
50 連結プレート
51 型締ピストン
52 ピストン
53 型締シリンダ
54 前進用油室
55 後退用油室
56 貫通孔
57 移動プレート
58 プレフィルバルブ
61 ブーストシリンダ
64 電磁切換弁
65 可変ポンプ
66 パイロット付電磁切換弁
67 電磁切換弁
68 可変ポンプ
71 油タンクBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one embodiment of the present invention, in which a moving plate is at a retreat limit. FIG. 2 is a view showing one embodiment of the present invention, and is a view when the pressure is increased at the forward limit of the moving plate. FIG. 3 is a diagram of a conventional mold clamping device. FIG. 4 is a view of a mold clamping device showing another conventional example. DESCRIPTION OF SYMBOLS 50 Connection plate 51 Mold clamping piston 52 Piston 53 Mold clamping cylinder 54 Forward oil chamber 55 Retreat oil chamber 56 Through hole 57 Moving plate 58 Prefill valve 61 Boost cylinder 64 Electromagnetic switching valve 65 Variable pump 66 Pilot With electromagnetic switching valve 67 With electromagnetic switching valve 68 Variable pump 71 Oil tank
Claims (1)
取付用の移動プレートを取付た型締シリンダと、型締シ
リンダの他端面に対向してフレーム等に型締方向に対し
て垂直に固定された連結プレートと、一端が前記連結プ
レートに片持状態で固着され、他端の自由端が型締シリ
ンダの内径面に液蜜に嵌挿され、型締シリンダ内を前
進、後退用油室に分けるとともに、両室を連絡する貫通
孔を有すピストンを形成した型締ピストンと、連結プレ
ートと移動プレートの間に前記型締シリンダと並列に設
けられ、型開閉に際し移動プレートを進退させるブース
トシリンダと、前記型締ピストンの他端に摺動自在に取
り付けられ、型締ピストンに設けた油路を介して導かれ
た圧油および型締シリンダ前進用室内の油圧により前記
ピストンに形成された貫通孔を開閉するプレフィルバル
ブとを有することを特徴とする射出成形機等の型締装
置。(57) [Claims] A mold clamping cylinder in which a piston is slidably fitted on an inner diameter surface, and a moving plate for mounting a moving mold is mounted at one end, and the piston is opposed to the other end surface of the mold clamping cylinder. A connecting plate fixed to a frame or the like perpendicular to the mold clamping direction, one end is fixed to the connecting plate in a cantilever state, and the free end of the other end is inserted into the inner surface of the mold clamping cylinder with liquid honey. The inside of the mold clamping cylinder is divided into forward and backward oil chambers, and a mold clamping piston formed with a piston having a through hole connecting the two chambers, and between the connecting plate and the moving plate, in parallel with the mold clamping cylinder. A boost cylinder for moving the movable plate forward and backward when the mold is opened and closed; a pressure oil and a mold clamping cylinder slidably attached to the other end of the mold clamping piston and guided through an oil passage provided in the mold clamping piston. By the oil pressure in the forward room Mold clamping apparatus, such as injection molding machine and having a prefill valve for opening and closing the through hole formed in the serial piston.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01853492A JP3196144B2 (en) | 1992-01-07 | 1992-01-07 | Mold clamping devices such as injection molding machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01853492A JP3196144B2 (en) | 1992-01-07 | 1992-01-07 | Mold clamping devices such as injection molding machines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0671711A JPH0671711A (en) | 1994-03-15 |
JP3196144B2 true JP3196144B2 (en) | 2001-08-06 |
Family
ID=11974297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP01853492A Expired - Fee Related JP3196144B2 (en) | 1992-01-07 | 1992-01-07 | Mold clamping devices such as injection molding machines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3196144B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4340693C2 (en) * | 1993-11-30 | 1996-07-11 | Karl Hehl | Mold clamping unit for a plastic injection molding machine |
GB9324821D0 (en) * | 1993-12-03 | 1994-01-19 | Emb Redman Ltd | Apparatus and method for moving a die of a pressure die casting machine |
-
1992
- 1992-01-07 JP JP01853492A patent/JP3196144B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0671711A (en) | 1994-03-15 |
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