JPH0333426B2 - - Google Patents
Info
- Publication number
- JPH0333426B2 JPH0333426B2 JP57014121A JP1412182A JPH0333426B2 JP H0333426 B2 JPH0333426 B2 JP H0333426B2 JP 57014121 A JP57014121 A JP 57014121A JP 1412182 A JP1412182 A JP 1412182A JP H0333426 B2 JPH0333426 B2 JP H0333426B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- oil
- return
- solenoid valve
- hydraulic
- 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 - Lifetime
Links
- 238000004512 die casting Methods 0.000 claims description 9
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、ダイカストマシンに於ける可動中
子用油圧シリンダの圧抜き装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure relief device for a hydraulic cylinder for a movable core in a die-casting machine.
（従来の技術及びその問題点）
一般に、此種の可動中子用油圧シリンダはダイ
カストマシンの金型に可動中子と連結された状態
で組み込み装備されていて且つ中子油圧回路とチ
エツク弁付カプラーにより抜き差し自在に接続さ
れていて、型替え時には中子油圧回路からカプラ
ー操作により引き抜き外されて金型と共にマシン
から取り外される様になつている。(Prior art and its problems) In general, this type of hydraulic cylinder for movable core is installed in the mold of a die-casting machine in a state connected to the movable core, and is equipped with a core hydraulic circuit and a check valve. It is connected by a coupler so that it can be inserted and removed freely, and when changing molds, it can be pulled out from the core hydraulic circuit by operating the coupler and removed from the machine together with the mold.
ところが、中子油圧回路はマシン油圧回路に接
続されマシンの電気制御回路の制御の基で中子用
電磁弁及び油圧ポンプが動作する様になつている
ため、型替え等時にダイカストマシンの動作を停
止させると中子油圧回路も停止し、中子用電磁弁
は中立状態となつて中子用電磁弁の入り、戻り切
替動作により該電磁弁から油入り兼戻りホース内
を通り可動中子用油圧シリンダ内（中子入り側又
は中子戻り側）に供給された圧油はシリンダ内と
ホース内にとじ込められた状態となり、該シリン
ダとホースを接続するカプラーのチエツク弁が圧
油によつて作業者の力で動かなくなつて、型替え
時にホースをシリンダから抜き外そうとしても簡
単に外れなかつたり、型替え後ホースをシリンダ
に接続しようとしてもチエツク弁の動きが圧油に
よつてロツクされて接続することができないとい
つたとじ込められた圧油による不具合が生じてい
る。 However, the core hydraulic circuit is connected to the machine hydraulic circuit, and the core solenoid valve and hydraulic pump are operated under the control of the machine's electric control circuit, so it is difficult to control the operation of the die-casting machine when changing molds, etc. When it is stopped, the core hydraulic circuit is also stopped, and the core solenoid valve is in a neutral state, and the core solenoid valve enters and returns through the switching operation, and the oil for the movable core passes from the solenoid valve through the oil-filled and return hose. Pressure oil supplied to the hydraulic cylinder (core entry side or core return side) is trapped inside the cylinder and hose, and the check valve of the coupler that connects the cylinder and hose is closed by the pressure oil. The check valve may become stuck due to the force of the worker, and when trying to remove the hose from the cylinder during a mold change, it will not come off easily, or when attempting to connect the hose to the cylinder after a mold change, the check valve will not move due to pressure oil. Trouble has occurred due to trapped pressure oil, which has become locked and cannot be connected.
そこで従来は第１図ｂに示す様に圧油によりロ
ツクされた状態で突出するカプラー４のチエツク
弁５をハンマー６で叩いて可動中子用油圧シリン
ダ内と油入り兼戻りホース内の油圧を夫々抜いて
いた。 Therefore, conventionally, as shown in Fig. 1b, the check valve 5 of the coupler 4, which protrudes while being locked by pressure oil, is hit with a hammer 6 to control the hydraulic pressure inside the hydraulic cylinder for the movable core and the oil-filled/return hose. Both were removed.
しかし、この様な従来の圧抜き方法は、全て手
作業であるから時間が掛ると共に、油が周囲に飛
散して作業者や作業現場を汚し、尚且残圧抜きが
完全に行なわれない不便欠点があつた。 However, such conventional pressure relief methods are time-consuming because they are all done manually, and have the disadvantage of being inconvenient: oil scatters around, contaminating workers and the work site, and the residual pressure cannot be completely relieved. It was hot.
（発明が解決しようとする課題）
本発明はこの様な従来の問題に鑑みてなされた
もので、その解決しようとする技術的課題は、可
動中子用油圧シリンダの中子入り側と中子戻り側
に中子用電磁弁から油入り兼戻りホースを夫々接
続すると共に中子用電磁弁には油圧ポンプから油
供給ホースを接続し且つ油タンクから油戻しホー
スを接続してなる中子油圧回路の前記可動中子用
油圧シリンダ内と油入り兼戻りホース内にダイカ
ストマシンの動作停止によりとじこめられた油圧
（残圧）を、該動作停止、即ち油圧ポンプの動作
停止後、中子用電磁弁から油タンクに配管された
油戻りホースを利用して自動的に且つ完全に圧抜
きし得る圧抜き装置を提供することにある。(Problem to be solved by the invention) The present invention has been made in view of such conventional problems, and the technical problem to be solved is the core insertion side of the hydraulic cylinder for movable core and the core A core hydraulic system is constructed by connecting oil-filled and return hoses from the core solenoid valve to the return side, connecting an oil supply hose from a hydraulic pump to the core solenoid valve, and connecting an oil return hose from an oil tank to the return side. The hydraulic pressure (residual pressure) trapped in the hydraulic cylinder for the movable core and the oil-filled/return hose of the circuit due to the stoppage of the die-casting machine, that is, after the stoppage of the hydraulic pump, is transferred to the solenoid for the core. To provide a pressure relief device which can automatically and completely relieve pressure by using an oil return hose piped from a valve to an oil tank.
（技術的課題を達成するための手段）
上記課題を達成するための本発明の技術的手段
は、可動中子用油圧シリンダの中子入り側と中子
戻り側に中子用電磁弁から油入り兼戻りホースを
夫々接続すると共に中子用電磁弁には油圧ポンプ
から油供給ホースを接続し且つ油タンクから油戻
しホースを接続してなる中子油圧回路と、前記油
圧ポンプの動作停止を感知するポンプ停止感知部
と、このポンプ停止感知部からの指令による前記
中子用電磁弁を入り、戻りの状態に切替動作させ
る電磁弁切替制御部とからなることである。(Means for Achieving the Technical Problem) The technical means of the present invention for achieving the above-mentioned problem is to provide oil from a solenoid valve for cores to the core entry side and the core return side of a movable core hydraulic cylinder. A core hydraulic circuit is formed by connecting input and return hoses, an oil supply hose from a hydraulic pump is connected to the core solenoid valve, and an oil return hose from an oil tank, and a core hydraulic circuit is formed by connecting an oil supply hose from a hydraulic pump to a solenoid valve for the core, and an oil return hose from an oil tank. It consists of a pump stop sensing section for sensing, and a solenoid valve switching control section for switching the core solenoid valve to the entering and returning state based on the command from the pump stop sensing section.
本発明の実施の一例を以下説明すると、第１図
ａは中子油圧回路Ａを示し、１が可動中子用油圧
シリンダ、２が中子用電磁弁、３が油圧シリンダ
２の中子入り側１１ｂと中子戻り側１１ａの中子
用電磁弁２のポートから夫々配管接続される油入
り兼戻りホース、４がこのホース３を油圧シリン
ダ１に抜き差し自在に接続するチエツク弁５付カ
プラー、１２が油圧ポンプから中子用電磁弁２の
ポートに配管接続される油供給ホース、１３が油
タンクから前記ポートに配管接続される油戻りホ
ースであり、ダイカストマシンが動作している間
は、油圧ポンプが動作し、リレーによつて中子用
電磁弁２の入りバルブ２ｂと戻りバルブ２ａが作
動し、可動中子用油圧シリンダ１が動作するが、
ダイカストマシンを停止させるべく、油圧ポンプ
を停止させると、当然に可動中子用油圧シリンダ
１も停止する。 An example of the implementation of the present invention will be described below. FIG. 1a shows a core hydraulic circuit A, where 1 is a hydraulic cylinder for a movable core, 2 is a solenoid valve for a core, and 3 is a hydraulic cylinder containing a core. An oil-filled/return hose connected to the ports of the solenoid valve 2 for cores on the side 11b and the core return side 11a, respectively, and a coupler 4 with a check valve 5 that connects the hose 3 to the hydraulic cylinder 1 in a freely insertable and detachable manner; 12 is an oil supply hose connected from the hydraulic pump to the port of the core solenoid valve 2; 13 is an oil return hose connected from the oil tank to the port; while the die-casting machine is operating, The hydraulic pump operates, the entry valve 2b and return valve 2a of the core electromagnetic valve 2 are operated by the relay, and the movable core hydraulic cylinder 1 is operated.
When the hydraulic pump is stopped in order to stop the die-casting machine, the movable core hydraulic cylinder 1 is also stopped as a matter of course.
油圧ポンプの停止はポンプ停止感知部Ｂにより
感知され、継いで電磁弁切替制御部Ｃの指令によ
り中子用電磁弁２を入り、戻り状態に切替動作さ
せ、可動中子用油圧シリンダー１内の残圧を圧抜
きするようになつている。 The stoppage of the hydraulic pump is detected by the pump stop sensing unit B, and then the solenoid valve 2 for the core is turned on by a command from the solenoid valve switching control unit C, and the solenoid valve 2 for the core is switched to the return state, and the hydraulic cylinder 1 for the movable core is activated. It is designed to relieve residual pressure.
ポンプ停止感知部Ｂはポンプ作動リレーMRと
ポンプ停止確認タイマーToとからなり、ポンプ
作動リレーMRのリレー接点７がONすることに
より油圧ポンプの停止を感知し、ポンプ停止確認
タイマーToが動作を開始し、タイマー接点８が
ONし、電磁弁切替制御部Ｃに圧抜き動作を支持
する。 Pump stop detection unit B consists of a pump operation relay MR and a pump stop confirmation timer To. When relay contact 7 of the pump operation relay MR turns ON, it senses the stop of the hydraulic pump, and the pump stop confirmation timer To starts operating. and timer contact 8
ON, and the solenoid valve switching control section C supports the pressure relief operation.
電磁弁切替制御部Ｃはシーケンス制御とタイマ
ーT1、T2とを組合わせた回路からなり、ポンプ
停止確認タイマーToによりタイマー接点８が
ONすると、圧抜きタイマーT1が動作を初め、中
子入り、戻り切替タイミング用タイマーT2によ
り、中子入り指令のリレー＃1を動作させ、タイ
ミング用タイマーT2が停止すると中子戻り指令
のリレー＃2を動作させる。 The solenoid valve switching control unit C consists of a circuit that combines sequence control and timers T 1 and T 2 , and the timer contact 8 is activated by the pump stop confirmation timer To.
When turned ON, the pressure release timer T 1 starts operating, and the core insertion/return switching timing timer T 2 operates relay # 1 for the core insertion command, and when the timing timer T 2 stops, the core return command is activated. Activate relay # 2 .
中子入りの指令のリレー＃1が動作し、リレー
接点１０ｂがONする〔２ｂ−１，２ｂ−２〕と
中子用電磁弁２の入りバルブ２ｂが動作し中子入
りの状態となる。 When the relay # 1 for the core insertion command is activated and the relay contact 10b is turned on [2b-1, 2b-2], the entry valve 2b of the solenoid valve 2 for the core is activated to enter the core insertion state.
この時、実際には油圧ポンプが停止しているの
で、可動中子用油圧シリンダ１は動作せず、代わ
に、中子戻り側１１ａの油圧が油戻りホース１３
を通りドレンして油タンクと同じレベル（０Kg／
cm2）に圧抜きされる。 At this time, since the hydraulic pump is actually stopped, the movable core hydraulic cylinder 1 does not operate, and instead, the hydraulic pressure on the core return side 11a is applied to the oil return hose 13.
drain to the same level as the oil tank (0 kg/
cm 2 ).
次に、中子戻り指令のリレー＃2が動作し、リ
レー接点１０ａがONする〔２ａ−１，２ａ−
２〕と戻りバルブ２ａが動作して中子戻りの状態
となる。すると、中子入り側１１ｂの圧油が油戻
りホース１３を通りドレンして油タンクと同じレ
ベル（０Kg／cm2）に圧抜きされ圧抜きタイマー
T1が停止して可動中子用油圧シリンダ１の中子
入り側１１ｂと中子戻り側１１ａの及び油入り兼
戻りホース３の圧抜きが完全に行なわれ完了とな
る。 Next, relay # 2 for core return command operates, and relay contact 10a turns ON [2a-1, 2a-
2], the return valve 2a operates and the core returns. Then, the pressure oil in the core entry side 11b drains through the oil return hose 13 and is relieved to the same level as the oil tank (0 kg/cm 2 ), and the pressure relief timer is activated.
T1 stops, and the pressure on the core entry side 11b and the core return side 11a of the movable core hydraulic cylinder 1 and the oil-filled/return hose 3 is completely released and completed.
而して、本発明の圧抜き装置によれば、ダイカ
ストマシンの動作停止に伴う中子油圧回路Ａの油
圧ポンプの停止をポンプ停止感知部Ｂのポンプ作
動リレーMRのリレー接点７により自動的に感知
し、電磁弁切替制御部Ｃの圧抜きタイマーT1と
中子入り、戻りタイミングタイマーT2による中
子用電磁弁２の入りバルブ２ｂと戻りバルブ２ａ
の切替動作により可動中子用油圧シリンダ１の中
子入り側１１ｂと中子戻り側１１ａのこれらに配
管接続される油入り兼戻りホース３内の圧油は油
戻りホース１３を通つて油タンクに自動的に圧抜
きされる。 According to the pressure relief device of the present invention, the hydraulic pump of the core hydraulic circuit A is automatically stopped by the relay contact 7 of the pump operation relay MR of the pump stop sensing section B when the operation of the die-casting machine is stopped. The entry valve 2b and return valve 2a of the solenoid valve 2 for the core are detected by the pressure release timer T1 of the solenoid valve switching control unit C and the core entry and return timing timer T2.
By the switching operation, the pressure oil in the oil-filled/return hose 3 connected to the core entry side 11b and the core return side 11a of the movable core hydraulic cylinder 1 is passed through the oil return hose 13 to the oil tank. The pressure is automatically released.
（発明の効果）
本発明可動中子用油圧シリンダの圧抜き装置は
叙上の如く構成してなるから、下記の作用効果を
奏する。(Effects of the Invention) Since the pressure relief device for a hydraulic cylinder for a movable core of the present invention is constructed as described above, it exhibits the following effects.
ダイカストマシンの動作停止により中子油圧回
路の油圧ポンプが停止すると、ポンプ停止感知部
がそれを感知し電磁弁切替制御部により中子用電
磁弁を入り、戻りの状態に切替動作させるため、
可動中子用油圧シリンダの中子入り側と中子戻り
側及びこれらに中子用電磁弁から夫々接続された
油入り兼戻りホース内の圧油は中子用電磁弁から
油タンクに接続された油戻りホースを通つて前記
油タンク内に自動的に且つ完全に圧抜きされる。
従つて、金型の型替えを行なう時にはチエツク弁
付カプラーにより抜き差し自在に接続されている
可動中子用油圧シリンダの中子入側、中子戻り側
と油入り兼戻りホース内は実施例詳述の如き油タ
ンクと同じレベル（０Kg／cm2）になつているた
め、油入り兼戻りホースを可動中子用油圧シリン
ダから簡単に抜き外して型替えを行なうことがで
き、型替え後は簡単に接続することができる。 When the hydraulic pump of the core hydraulic circuit stops due to the die-casting machine's operation being stopped, the pump stop sensing section senses this and the solenoid valve switching control section switches the solenoid valve for the core into the return state.
The pressure oil in the core entry side and core return side of the hydraulic cylinder for movable cores and the oil-filled/return hoses connected to these from the solenoid valve for core is connected from the solenoid valve for core to the oil tank. The oil is automatically and completely depressurized into the oil tank through the oil return hose.
Therefore, when changing the mold, the core entry side, the core return side, and the inside of the oil-filled and return hose of the hydraulic cylinder for the movable core, which are connected to the hydraulic cylinder with a check valve so that it can be inserted and removed freely, are detailed in the example. Since it is at the same level as the oil tank (0 kg/cm 2 ) as mentioned above, the oil-filled and return hose can be easily removed from the movable core hydraulic cylinder to change the model. Can be easily connected.
依つて、所期の目的を達成し得た。 Thus, we were able to achieve our intended purpose.
第１図ａは中子油圧回路、第１図ｂは従来の圧
抜き方法を部分断面図、第２図は本発明圧抜き装
置の電気制御回路である。
尚、図中、Ａ：中子油圧回路、Ｂ：ポンプ停止
感知部、Ｃ：電磁弁切替制御部、１：可動中子用
油圧シリンダ、２：中子用電磁弁、３：油入り兼
戻りホース、４：チエツク弁付カプラー、１１
ａ：中子戻り側、１１ｂ：中子入り側、１２：油
供給ホース、１３：油戻りホース。
FIG. 1a is a core hydraulic circuit, FIG. 1b is a partial sectional view of a conventional pressure relief method, and FIG. 2 is an electric control circuit of the pressure relief device of the present invention. In the figure, A: Core hydraulic circuit, B: Pump stop sensing section, C: Solenoid valve switching control section, 1: Hydraulic cylinder for movable core, 2: Solenoid valve for core, 3: Oil filling and return Hose, 4: Coupler with check valve, 11
a: core return side, 11b: core entry side, 12: oil supply hose, 13: oil return hose.
Claims (1)
戻り側に中子用電磁弁から油入り兼戻りホースを
夫々接続すると共に中子用電磁弁には油圧ポンプ
から油供給ホースを接続し且つ油タンクから油戻
しホースを接続してなる中子油圧回路と、前記油
圧ポンプの動作停止を感知するポンプ停止感知部
と、このポンプ停止感知部からの指令による前記
中子用電磁弁を入り、戻りの状態に切替動作させ
る電磁弁切替制御部とからなることを特徴とする
ダイカストマシンに於ける可動中子用油圧シリン
ダの圧抜き装置。1 Connect the oil-filling and return hoses from the core solenoid valve to the core entry side and core return side of the movable core hydraulic cylinder, respectively, and connect the oil supply hose from the hydraulic pump to the core solenoid valve. A core hydraulic circuit formed by connecting an oil return hose from an oil tank, a pump stop sensing section that detects the stoppage of operation of the hydraulic pump, and a solenoid valve for the core based on a command from the pump stop sensing section are connected. 1. A pressure relief device for a hydraulic cylinder for a movable core in a die-casting machine, comprising: a solenoid valve switching control section for switching operation to a return state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1412182A JPS58132361A (en) | 1982-01-30 | 1982-01-30 | Residual pressure remover of hydraulic cylinder for movable core in die casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1412182A JPS58132361A (en) | 1982-01-30 | 1982-01-30 | Residual pressure remover of hydraulic cylinder for movable core in die casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58132361A JPS58132361A (en) | 1983-08-06 |
| JPH0333426B2 true JPH0333426B2 (en) | 1991-05-17 |
Family
ID=11852282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1412182A Granted JPS58132361A (en) | 1982-01-30 | 1982-01-30 | Residual pressure remover of hydraulic cylinder for movable core in die casting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58132361A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2588514B2 (en) * | 1986-10-16 | 1997-03-05 | 東芝機械株式会社 | How to remove residual pressure from core cylinder hydraulic circuit |
| JPH01152101U (en) * | 1988-04-12 | 1989-10-20 | ||
| US4881371A (en) * | 1988-07-26 | 1989-11-21 | Clark Equipment Company | Auxiliary coupler pressure relief hydraulic system with pump drive ignition switch relief |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4719984U (en) * | 1971-01-19 | 1972-11-06 |
-
1982
- 1982-01-30 JP JP1412182A patent/JPS58132361A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4719984U (en) * | 1971-01-19 | 1972-11-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58132361A (en) | 1983-08-06 |
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