JPH07198056A - Solenoid valve control device at the operating time of safety switch - Google Patents

Solenoid valve control device at the operating time of safety switch

Info

Publication number
JPH07198056A
JPH07198056A JP35364293A JP35364293A JPH07198056A JP H07198056 A JPH07198056 A JP H07198056A JP 35364293 A JP35364293 A JP 35364293A JP 35364293 A JP35364293 A JP 35364293A JP H07198056 A JPH07198056 A JP H07198056A
Authority
JP
Japan
Prior art keywords
solenoid valve
reciprocating
safety switch
machine
backward
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.)
Pending
Application number
JP35364293A
Other languages
Japanese (ja)
Inventor
Eiji Ichimatsu
栄司 一松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP35364293A priority Critical patent/JPH07198056A/en
Publication of JPH07198056A publication Critical patent/JPH07198056A/en
Pending legal-status Critical Current

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  • Magnetically Actuated Valves (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Control Of Presses (AREA)

Abstract

PURPOSE:To heighten operating efficiency by storing the advance end or retreat end of the reciprocating action position of a reciprocating machine at the time of a safety switch being put in the off state, and enabling the immediate resumption of operation when the reciprocating action position of the reciprocating machine is not changed in the case of operating the safety switch. CONSTITUTION:An advance limit sensor 3 and a retreat limit sensor 4 are provided to respectively detect the advance end and retreat end of the reciprocating action position of a reciprocating machine 1, and the output signals are inputted to a control part along with the output signal of a safety switch for the cutoff and current control of the power supply of a solenoid valve 5. When the safety switch is put in the off state, the advance end or retreat end of the reciprocating action position of the reciprocating machine 1 at that time is stored, and the advance end or retreat end of the reciprocating action position of the reciprocating machine 1 at the time of the safety switch being reset into the on state is then detected and compared with the stored advance end or retreat end. In the case of no change in the position, the solenoid valve 5 is automatically excited, and the solenoid valve 5 changed in the position is displayed to that effect.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、電磁弁の開閉により
油圧または空気圧シリンダーを動作させる往復動作機械
全般において、安全スイッチ操作時の電磁弁制御装置に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve control device for operating a safety switch in general reciprocating machines that operate a hydraulic or pneumatic cylinder by opening and closing a solenoid valve.

【0002】[0002]

【従来の技術】近来、鉄鋼等のプラントにおいては、安
全性の確保はプラントの操作性をかなり悪化させてきて
いる。例えば、電磁弁の開閉により油圧または空気圧シ
リンダーを動作させる機械全般では、修理や調整等のた
め機械内への立入り作業を行う場合、安全スイッチを操
作して電磁弁の電源を遮断し、安全を確保したうえで機
械内への立入り作業を行い、機械内への立入り作業完了
により安全スイッチを操作して電磁弁の電源を通電し、
再び操業開始を行うに際には多数の準備作業が必要であ
る。
2. Description of the Related Art Recently, in a plant of steel or the like, ensuring safety has considerably deteriorated the operability of the plant. For example, in general machines that operate hydraulic or pneumatic cylinders by opening and closing solenoid valves, when entering the machine for repairs or adjustments, operate the safety switch to shut off the solenoid valve power to ensure safety. After entering the inside of the machine after securing it, operate the safety switch to turn on the solenoid valve power when the inside of the machine is completed,
A lot of preparatory work is required to start the operation again.

【0003】従来、前進、中立、後退の3ポジション動
作位置を有する電磁弁を用いる油圧または空気圧シリン
ダーは、電磁弁の中立状態において機械の自重等によっ
て動作位置が変化する可能性を有している。このため、
安全スイッチは、切りにて電磁弁の電源が遮断されるよ
う構成されているが、再び入りとして電磁弁電源に通電
すると、電磁弁の動作位置を中立のままとしていた。そ
の理由は、もし機械の自重等による油漏れが原因で電磁
弁の動作位置が変化していた場合、電磁弁が動作状態と
なり、オペレータの意志と無関係に油圧または空気圧シ
リンダーが動作するので危険であるからである。
Conventionally, a hydraulic or pneumatic cylinder using a solenoid valve having a three-position operating position of forward, neutral, and reverse has a possibility that the operating position may change due to the weight of the machine or the like in the neutral state of the electromagnetic valve. . For this reason,
The safety switch is configured to cut off the power supply of the solenoid valve when turned off, but when the power supply to the solenoid valve is turned on again to turn on the power, the operating position of the solenoid valve remains neutral. The reason is that if the operating position of the solenoid valve has changed due to oil leakage due to the machine's own weight, etc., the solenoid valve will be in the operating state and the hydraulic or pneumatic cylinder will operate regardless of the operator's intention, so it is dangerous. Because there is.

【0004】一方、安全スイッチを入りとし電磁弁電源
に通電しての操業開始の運転条件としては、電磁弁の励
磁のみ、または電磁弁の励磁と油圧または空気圧シリン
ダーの位置検出センサが両方ともON状態であることを
確認する2種類の方法があった。なお、上記2種類以外
では、位置検出センサのみを確認する方法(その時電磁
弁の励磁をしない)があるが、運転中油漏れ等で機器が
少しずつ位置がずれ、インターロック不成立なってライ
ン停機する等の問題があるので、一般には適用されてい
ない。したがって、安全スイッチを切りから入りとした
場合、電磁弁が中立のままで、運転条件が整わないた
め、直ちに操業を再開できず、オペレータが機側操作盤
を操作して必要な電磁弁について励磁操作を行い、動作
状態として運転条件を整えたのち、操業を再開してい
た。
On the other hand, the operating conditions for starting the operation with the safety switch turned on and the solenoid valve power supply being energized are only the solenoid valve excitation, or both the solenoid valve excitation and the hydraulic or pneumatic cylinder position detection sensor. There were two methods of confirming that the condition was met. In addition to the above two types, there is a method of checking only the position detection sensor (the solenoid valve is not excited at that time), but the device gradually shifts its position due to oil leakage during operation, and the line is stopped due to an interlock failure. It is not generally applied because of problems such as. Therefore, if the safety switch is turned on and off, the solenoid valve will remain neutral and the operating conditions will not be met, so operation cannot be resumed immediately, and the operator operates the machine side operation panel to excite the required solenoid valve. After the operation was performed and the operating conditions were adjusted as the operating state, the operation was restarted.

【0005】[0005]

【発明が解決しようとする課題】上記従来の方法では、
安全スイッチを切りにして電磁弁電源を遮断し、機械内
への立入り作業を行ったのち、安全スイッチを入りとし
て電磁弁電源に通電しても、電磁弁を励磁操作して動作
状態とし、運転条件を整えるため、機側操作盤が5ケ所
以上あるプラントにおいては、十数分の時間を要してい
た。このため、一度安全スイッチを切りとして電磁弁電
源を遮断すれば、操業再開までにかなりの時間を要する
こととなるため、オペレータは、安易に安全スイッチを
切って電磁弁電源を遮断することができず、電磁弁電源
を遮断する安全スイッチを切らずに機械内に立ち入るよ
うな不安全行動を取る人が多くなり易い。
SUMMARY OF THE INVENTION In the above conventional method,
After turning off the safety switch and shutting off the solenoid valve power supply, after entering the machine, even if the safety valve is turned on and the solenoid valve power supply is energized, the solenoid valve is excited and put into operation. In order to adjust the conditions, it took dozens of minutes in a plant with five or more machine-side operation panels. Therefore, once the safety switch is turned off and the solenoid valve power is shut off, it will take a considerable amount of time to resume operation, so the operator can easily turn off the safety switch to shut off the solenoid valve power. Therefore, many people tend to take unsafe actions such as entering the machine without turning off the safety switch that shuts off the solenoid valve power.

【0006】この発明の目的は、安全スイッチを操作し
て電磁弁電源を遮断した場合においても、安全スイッチ
を入りとして電磁弁電源に通電すると、直ちに操業を再
開できる安全スイッチ操作時の電磁弁制御装置を提供す
ることにある。
An object of the present invention is to control a solenoid valve at the time of operating the safety switch so that even when the safety switch is operated to shut off the solenoid valve power supply, the operation can be resumed immediately by energizing the solenoid valve power supply with the safety switch turned on. To provide a device.

【0007】[0007]

【課題を解決するための手段】本発明者らは、上記目的
を達成すべく種々試験検討を重ねた。その結果、往復動
作機械の往復動作位置の前進端、後退端を検出し、安全
スイッチ切り状態となったときの往復動作機械の往復動
作位置の前進端または後退端を記憶し、次に安全スイッ
チ入り状態となった時の往復動作機械の往復動作位置
と、安全スイッチ切り状態となったときの記憶した前進
端または後退端と比較し、位置が変わっていなければ自
動的に電磁弁を励磁すると共に、位置が変わった電磁弁
については表示することによって、安全スイッチを操作
した場合においても、往復動作機械の往復動作位置の変
化がなければ直ちに運転再開でき、また、往復動作機械
の往復動作位置に変化が生じても、その電磁弁が表示さ
れるため、励磁操作が容易となることを確認し、この発
明に到達した。
Means for Solving the Problems The inventors of the present invention have conducted various tests and examinations in order to achieve the above object. As a result, the forward and backward ends of the reciprocating position of the reciprocating machine are detected, and the forward or backward end of the reciprocating position of the reciprocating machine when the safety switch is turned off is stored. Reciprocating motion when the machine is in the ON state Compared with the reciprocating position of the machine and the stored forward end or backward end when the safety switch is in the OFF state, if the position does not change, the solenoid valve is automatically excited. Also, by displaying the solenoid valve whose position has changed, even if the safety switch is operated, operation can be restarted immediately if there is no change in the reciprocating operation position of the reciprocating machine. Even when the change occurs, the electromagnetic valve is displayed, so it was confirmed that the exciting operation was easy, and the present invention was reached.

【0008】すなわちこの発明は、往復動作機械の自重
等により電磁弁中立状態において動作位置が変化する可
能性を有し、前進、中立、後退の3ポジション動作位置
を有する電磁弁を用いて往復動作機械の流体圧回路を制
御し、安全スイッチ操作により電磁弁の制御電源を遮
断、通電できる安全スイッチ操作時の電磁弁制御装置に
おいて、往復動作機械の往復動作位置の前進端、後退端
を検出し、制御部に出力する手段と、往復動作機械の往
復動作位置の前進端、後退端を検出する手段から入力さ
れる前進端または後退端の信号に基づき、安全スイッチ
切り状態となったときの往復動作機械の往復動作位置の
前進端または後退端を記憶すると共に電磁弁を中立状態
とし、次に安全スイッチ入り状態となった時の往復動作
機械の往復動作位置の前進端または後退端と、記憶した
前進端または後退端とを比較し、位置が変わっていなけ
れば自動的に電磁弁を励磁すると共に、位置が変わった
電磁弁については中立状態のままとする制御部とからな
ることを特徴とする安全スイッチ操作時の電磁弁制御装
置である。
That is, according to the present invention, there is a possibility that the operating position may change in the neutral state of the solenoid valve due to the self-weight of the reciprocating machine, and the reciprocating operation is performed by using the solenoid valve having the three-position operating positions of forward, neutral and reverse. The solenoid valve control device that controls the fluid pressure circuit of the machine and shuts off the control power of the solenoid valve by energizing the safety switch to energize it detects the forward and backward ends of the reciprocating position of the reciprocating machine. , A reciprocating operation when the safety switch is turned off, based on the signal of the forward end or the backward end inputted from the means for outputting to the control unit and the forward end or backward end of the reciprocating position of the reciprocating machine. The forward and backward ends of the reciprocating position of the operating machine are stored, and the reciprocating position of the reciprocating machine when the solenoid valve is in the neutral state and the safety switch is turned on next time. Control that compares the forward end or backward end with the stored forward end or backward end, and automatically excites the solenoid valve if the position has not changed, and leaves the solenoid valve whose position has changed in the neutral state It is a solenoid valve control device at the time of operating a safety switch, characterized in that

【0009】[0009]

【作用】この発明においては、往復動作機械の往復動作
位置の前進端、後退端を検出し、安全スイッチ切り状態
となったときの往復動作機械の往復動作位置の前進端ま
たは後退端を記憶すると共に電磁弁を中立状態とし、次
に安全スイッチ入り状態となった時の往復動作機械の往
復動作位置の前進端または後退端と、記憶した前進端ま
たは後退端とを比較し、位置が変わっていなければ自動
的に電磁弁を励磁すると共に、位置が変わった電磁弁に
ついては中立状態のままとする制御部を設けたことによ
って、安全スイッチを操作した場合において往復動作機
械の往復動作位置が変化していなければ、直ちに操業を
再開できると共に、往復動作機械の往復動作位置が変化
した電磁弁については、表示することによってその電磁
弁のみを励磁操作すればよく、短時間で運転条件を整え
ることができる。
According to the present invention, the forward end and the backward end of the reciprocating position of the reciprocating machine are detected, and the forward end or the backward end of the reciprocating position of the reciprocating machine when the safety switch is turned off are stored. When the solenoid valve is set to the neutral state and the safety switch is turned on next time, the forward / backward end of the reciprocating operation position of the reciprocating machine is compared with the stored forward / backward end, and the position has changed. Otherwise, the solenoid valve is automatically excited, and the solenoid valve whose position has changed is provided with a control unit that keeps it in the neutral state, so that the reciprocating position of the reciprocating machine changes when the safety switch is operated. If not, the operation can be restarted immediately, and for the solenoid valve whose reciprocating movement position of the reciprocating machine has changed, by displaying it, only the solenoid valve is operated for excitation. It may be Re can adjust the short time operation conditions.

【0010】この発明における往復動作機械とは、前
進、中立、後退の3ポジション動作位置を有する電磁弁
を用いて油圧または空気圧回路を制御し、往復動作を行
う油圧シリンダーまたは空気圧シリンダーを組込んだプ
ラントをいう。また、往復動作機械の往復動作位置の前
進端または後退端の検出手段としては、リミットスイッ
チ、電磁スイッチ等往復動作機械の往復動作位置の前進
限または後退限を検出できればよく、特に限定されるも
のではない。
The reciprocating machine according to the present invention incorporates a hydraulic cylinder or a pneumatic cylinder that reciprocates by controlling a hydraulic or pneumatic circuit by using a solenoid valve having a three-position operating position of forward, neutral and reverse. A plant. The means for detecting the forward or backward end of the reciprocating position of the reciprocating machine is not particularly limited as long as it can detect the forward limit or the backward limit of the reciprocating position of the reciprocating machine such as a limit switch or an electromagnetic switch. is not.

【0011】[0011]

【実施例】以下にこの発明の詳細を実施の一例を示す図
1ないし図4に基づいて説明する。図1はこの発明の往
復動作を行う油圧シリンダーの油圧回路図、図2は安全
スイッチと電磁弁の電気回路図、図3は油圧シリンダー
の往復動作位置の前進端または後退端の検出手段の電気
回路図、図4は往復動作を行う油圧シリンダーの制御部
における安全スイッチ操作時の制御系統図である。図1
において、1は往復動作機械の油圧シリンダー、2は油
圧シリンダー1のピストンロッドで、ピストンロッド2
の前進端および後退端には、前進限センサ3および後退
限センサ4が設置され、ピストンロッド2の前進端およ
び後退端を検出するよう構成されている。5は前進、中
立、後退の3ポジション動作位置を有するダブルソレノ
イド3ポジション電磁弁で、図示しない油圧ポンプから
の配管6および油圧タンクへの配管7が接続され、電磁
弁5を操作することにより、油圧シリンダー1のピスト
ンロッド2が前後進するよう構成されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is a hydraulic circuit diagram of a hydraulic cylinder that performs reciprocating motion according to the present invention, FIG. 2 is an electric circuit diagram of a safety switch and a solenoid valve, and FIG. 3 is an electric circuit of a forward end or a backward end detecting means of a reciprocating position of the hydraulic cylinder. FIG. 4 is a control system diagram when a safety switch is operated in a control unit of a hydraulic cylinder that performs a reciprocating operation. Figure 1
In the figure, 1 is a hydraulic cylinder of a reciprocating machine, 2 is a piston rod of the hydraulic cylinder 1, and 2 is a piston rod.
A forward limit sensor 3 and a backward limit sensor 4 are installed at the forward end and the backward end of, and are configured to detect the forward end and the backward end of the piston rod 2. Reference numeral 5 is a double solenoid 3-position solenoid valve having forward, neutral, and reverse three-position operation positions. A pipe 6 from a hydraulic pump (not shown) and a pipe 7 to a hydraulic tank are connected to the solenoid valve 5 by operating the solenoid valve 5. The piston rod 2 of the hydraulic cylinder 1 is configured to move forward and backward.

【0012】図2において、11は安全スイッチで、安
全スイッチ11がOFFとなるとリレーSWが開き、リ
レーSWの接点SWaがOFFとなってリレーAが開
き、リレーAの接点式開閉器CTTがOFFとなって前
記電磁弁5の電源12が遮断される。また、安全スイッ
チ11がONとなるとリレーSWが閉じ、リレーSWの
接点SWaがONとなってリレーAが閉じ、リレーAの
接点式開閉器CTTがONとなって前記電磁弁5の電源
12が通電されるよう構成されている。なお、図2中の
13は安全スイッチ11の開閉信号を図示しない制御部
に伝送するデジタル入力基板、14は制御部からの電磁
弁5の励磁信号を出力するデジタル出力基板、15は電
磁弁5の操作リレーで、後退リレーSV1が励磁すると
後退動作位置に、前進リレーSV2が励磁すると前進動
作位置に切替えられる。また、MCCBはモールドサー
キットブレーカである。図3において、16は前進限セ
ンサ3および後退限センサ4の検出信号を図示しない制
御部に伝送するデジタル入力基板である。なお、図1な
いし図3は、制御部がプログラマブルロジックコンピュ
ータであることを前提として記述しているが、従来のハ
ードリレー盤においても同様の思想で適用できることは
云うまでもない。
In FIG. 2, reference numeral 11 denotes a safety switch. When the safety switch 11 is turned off, the relay SW is opened, the contact SWa of the relay SW is turned off, the relay A is opened, and the contact type switch CTT of the relay A is turned off. Then, the power source 12 of the solenoid valve 5 is shut off. When the safety switch 11 is turned on, the relay SW is closed, the contact SWa of the relay SW is turned on, the relay A is closed, the contact type switch CTT of the relay A is turned on, and the power source 12 of the solenoid valve 5 is turned on. It is configured to be energized. Reference numeral 13 in FIG. 2 denotes a digital input board for transmitting an opening / closing signal of the safety switch 11 to a control unit (not shown), 14 a digital output board for outputting an excitation signal of the solenoid valve 5 from the control unit, and 15 a solenoid valve When the reverse relay SV1 is excited, the operation relay is switched to the reverse operation position, and when the forward relay SV2 is excited, the operation relay is switched to the forward operation position. MCCB is a molded circuit breaker. In FIG. 3, reference numeral 16 is a digital input board for transmitting the detection signals of the forward limit sensor 3 and the backward limit sensor 4 to a controller (not shown). 1 to 3 are described on the assumption that the control unit is a programmable logic computer, it goes without saying that the same idea can be applied to a conventional hard relay board.

【0013】往復動作機械への立入りのため、安全スイ
ッチ11を切った場合、安全スイッチ11がOFFとな
るとリレーSWが開き、リレーSWの接点SWaがOF
FとなってリレーAが開き、リレーAの接点式開閉器C
TTがOFFとなって前記電磁弁5の電源12が遮断さ
れ、電磁弁5は中立状態となる。図示しない制御部は、
図4に示すとおり、デジタル入力基板13から安全スイ
ッチ11がOFFとなった信号を受信すると、デジタル
入力基板16から入力されている前進限センサ3がON
かOFFかを判断し、ONの場合は電磁弁5の中立状態
を保持する。また、前進限センサ3がOFFの場合は、
後退限センサ4がONかOFFかを判断し、ONの場合
は電磁弁5の中立状態を保持する。さらに、後退限セン
サ4がOFFの場合も、電磁弁5の中立状態を保持す
る。
When the safety switch 11 is turned off to enter the reciprocating machine, the relay SW is opened when the safety switch 11 is turned off, and the contact SWa of the relay SW is OF.
The relay A opens as F and the contact type switch C of the relay A
The power source 12 of the solenoid valve 5 is cut off when TT is turned off, and the solenoid valve 5 is in the neutral state. The control unit (not shown)
As shown in FIG. 4, when the signal indicating that the safety switch 11 is turned off is received from the digital input board 13, the forward limit sensor 3 input from the digital input board 16 is turned on.
If it is ON, the neutral state of the solenoid valve 5 is maintained. When the forward limit sensor 3 is OFF,
It is determined whether the reverse limit sensor 4 is ON or OFF, and if it is ON, the neutral state of the solenoid valve 5 is maintained. Further, even when the backward limit sensor 4 is OFF, the neutral state of the solenoid valve 5 is maintained.

【0014】しかるのち、往復動作機械への立入り作業
を行うことによって、往復動作機械への立入り作業時の
安全が確保される。オペレータは、往復動作機械への立
入り作業が完了したことを確認すると安全スイッチ11
を入れる。安全スイッチ11がONとなるとリレーSW
が閉じ、リレーSWの接点SWがONとなってリレーA
が閉じ、リレーAの接点式開閉器CTTがONとなって
前記電磁弁5の電源12が通電される。図示しない制御
部は、図4に示すとおり、デジタル入力基板13から安
全スイッチ11がONとなった信号を受信すると、安全
スイッチ11を切る前のデジタル入力基板16から入力
されている前進限センサ3がONの場合は、デジタル入
力基板16から入力されている前進限センサ3が現在O
NかOFFかを判断し、ONの場合は、電磁弁5のSV
2を励磁して直ちに往復動作機械の油圧シリンダー1の
運転を再開する。また、安全スイッチ11を切る前のデ
ジタル入力基板16から入力されている後退限センサ4
がONの場合は、現在のデジタル入力基板16から入力
されている後退限センサ4がONかOFFかを判断し、
ONの場合は電磁弁5のSV1を励磁して直ちに往復動
作機械の油圧シリンダー1の運転を再開する。
After that, by performing the entry work to the reciprocating machine, the safety at the entry work to the reciprocating machine is secured. When the operator confirms that the access work to the reciprocating machine has been completed, the safety switch 11
Put in. Relay SW when safety switch 11 is ON
Is closed, the contact SW of the relay SW is turned on, and the relay A
Is closed, the contact type switch CTT of the relay A is turned on, and the power source 12 of the solenoid valve 5 is energized. As shown in FIG. 4, when the control unit (not shown) receives a signal indicating that the safety switch 11 is turned on from the digital input board 13, the forward limit sensor 3 is input from the digital input board 16 before the safety switch 11 is turned off. When is ON, the forward limit sensor 3 input from the digital input board 16 is currently O
Judge whether N or OFF, and if ON, SV of solenoid valve 5
2 is excited to immediately restart the operation of the hydraulic cylinder 1 of the reciprocating machine. In addition, the backward limit sensor 4 input from the digital input board 16 before the safety switch 11 is turned off.
Is ON, it is determined whether the backward limit sensor 4 currently input from the digital input board 16 is ON or OFF,
When ON, SV1 of the solenoid valve 5 is excited to immediately restart the operation of the hydraulic cylinder 1 of the reciprocating machine.

【0015】一方、油圧シリンダー1のピストンロッド
2が自重により安全スイッチ11を切る前の位置から移
動した場合は、安全スイッチ11を切る前にデジタル入
力基板16から入力されていた前進限センサ3または後
退限センサ4がONであったものがOFFとなるから、
電磁弁5の中立状態を保持すると共に、当該電磁弁5の
動作位置変動をオペレータに表示する。したがって、オ
ペレータは、周辺の安全状態を確認した後に位置ずれが
発生した油圧シリンダー1の電磁弁5のみを励磁操作
し、安全スイッチ11を切る前の位置に油圧シリンダー
1のピストンロッド2を復帰せしめたのち、往復動作機
械の油圧シリンダー1の運転を再開する。
On the other hand, when the piston rod 2 of the hydraulic cylinder 1 moves from the position before the safety switch 11 is turned off by its own weight, the forward limit sensor 3 or the forward limit sensor 3 input from the digital input board 16 before the safety switch 11 is turned off or Since the backward limit sensor 4 turns ON, it turns OFF,
The neutral state of the solenoid valve 5 is maintained, and the operating position variation of the solenoid valve 5 is displayed to the operator. Therefore, the operator excites only the solenoid valve 5 of the hydraulic cylinder 1 in which the displacement has occurred after confirming the surrounding safety state, and returns the piston rod 2 of the hydraulic cylinder 1 to the position before turning off the safety switch 11. After that, the operation of the hydraulic cylinder 1 of the reciprocating machine is restarted.

【0016】[0016]

【発明の効果】以上述べたとおり、この発明によれば、
往復動作機械を組込んだプラントにおいて、往復動作機
械内への立入りのため安全スイッチを操作しても、安全
スイッチが入りとなると、往復動作機械の動作位置に変
化がなければ直ちに運転を再開できると共に、往復動作
機械の動作位置に変化が生じた場合は、動作位置変動を
表示するから、動作位置のずれが起こった電磁弁のみ励
磁して往復動作機械の動作位置を元に復帰せしめればよ
く、迅速に往復動作機械の運転を再開できる。したがっ
て、オペレータは、安全スイッチを容易に使用可能とな
り、不安全行動を無くすることができる。
As described above, according to the present invention,
In a plant incorporating a reciprocating machine, even if the safety switch is operated to enter the reciprocating machine, if the safety switch is turned on, the operation can be restarted immediately if the operating position of the reciprocating machine does not change. At the same time, if there is a change in the operating position of the reciprocating machine, the operating position fluctuation is displayed, so if only the solenoid valve in which the operating position has shifted is excited, it can be restored based on the operating position of the reciprocating machine. Well, the operation of the reciprocating machine can be restarted quickly. Therefore, the operator can easily use the safety switch and can eliminate unsafe behavior.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の往復動作を行う油圧シリンダーの油
圧回路図である。
FIG. 1 is a hydraulic circuit diagram of a hydraulic cylinder that reciprocates according to the present invention.

【図2】安全スイッチと電磁弁の電気回路図である。FIG. 2 is an electric circuit diagram of a safety switch and a solenoid valve.

【図3】油圧シリンダーの往復動作位置の前進端または
後退端の検出手段の電気回路図である。
FIG. 3 is an electric circuit diagram of a detection unit for detecting a forward end or a backward end of a reciprocating position of a hydraulic cylinder.

【図4】往復動作を行う油圧シリンダーの制御部におけ
る安全スイッチ操作時の制御系統図である。
FIG. 4 is a control system diagram when a safety switch is operated in a control unit of a hydraulic cylinder that performs a reciprocating operation.

【符号の説明】[Explanation of symbols]

1 油圧シリンダー 2 ピストンロッド 3 前進限センサ 4 後退限センサ 5 電磁弁 6、7 配管 11 安全スイッチ 12 電源 13、16 デジタル入力基板 14 デジタル出力基板 15 操作リレー SW、A リレー SWa 接点 CTT 接点式開閉器 SV1 後退リレー SV2 前進リレー MCCB モールドサーキットブレーカ 1 Hydraulic cylinder 2 Piston rod 3 Forward limit sensor 4 Reverse limit sensor 5 Solenoid valve 6, 7 Piping 11 Safety switch 12 Power supply 13, 16 Digital input board 14 Digital output board 15 Operation relay SW, A relay SWa contact CTT contact type switch SV1 Reverse Relay SV2 Forward Relay MCCB Molded Circuit Breaker

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 電磁弁中立状態において往復動作機械の
自重等により動作位置が変化する可能性を有し、前進、
中立、後退の3ポジション動作位置を有する電磁弁を用
いて往復動作機械の油圧回路を制御し、安全スイッチ操
作により電磁弁の電源を遮断、通電できる電気回路を有
する安全スイッチ操作時の電磁弁制御装置において、往
復動作機械の往復動作位置の前進限、後退限を検出し、
制御部に出力する手段と、安全スイッチの入り、切り状
態と往復動作機械の往復動作位置の前進限、後退限を検
出する手段から入力される前進限または後退限の信号に
基づき、安全スイッチ切り状態となったときの往復動作
機械の往復動作位置の前進限または後退限を記憶し、次
に安全スイッチ入り状態に復帰時の往復動作機械の往復
動作位置の前進限、後退限を検出し、記憶した前進限ま
たは後退限と比較し、位置が変わっていなければ自動的
に電磁弁を励磁すると共に、位置が変わった電磁弁につ
いては表示する制御部とからなることを特徴とする安全
スイッチ操作時の電磁弁制御装置。
1. When the solenoid valve is in a neutral state, the operating position may change due to the weight of the reciprocating machine itself, etc.
Control the hydraulic circuit of the reciprocating machine by using the solenoid valve that has the three-position operation position of neutral and reverse, and control the solenoid valve when operating the safety switch that has an electric circuit that can shut off the power of the solenoid valve by energizing the safety switch. The device detects the forward and backward limits of the reciprocating position of the reciprocating machine,
Based on the means for outputting to the control unit and the safety switch ON / OFF state and the forward / backward limit signal input from the means for detecting the forward / backward limit of the reciprocating motion position of the reciprocating motion machine, the safety switch is switched off. Memorize the forward limit or backward limit of the reciprocating position of the reciprocating machine when it becomes a state, and then detect the forward limit or backward limit of the reciprocating position of the reciprocating machine when returning to the safety switch ON state, Compared with the stored forward limit or backward limit, if the position has not changed, the solenoid valve is automatically excited, and a safety switch operation characterized by a control unit that displays for the solenoid valve whose position has changed Solenoid valve control device at the time.
JP35364293A 1993-12-28 1993-12-28 Solenoid valve control device at the operating time of safety switch Pending JPH07198056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35364293A JPH07198056A (en) 1993-12-28 1993-12-28 Solenoid valve control device at the operating time of safety switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35364293A JPH07198056A (en) 1993-12-28 1993-12-28 Solenoid valve control device at the operating time of safety switch

Publications (1)

Publication Number Publication Date
JPH07198056A true JPH07198056A (en) 1995-08-01

Family

ID=18432232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35364293A Pending JPH07198056A (en) 1993-12-28 1993-12-28 Solenoid valve control device at the operating time of safety switch

Country Status (1)

Country Link
JP (1) JPH07198056A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102039691A (en) * 2010-12-28 2011-05-04 平顶山市通运矿山机械厂 PLC control system for pulverized coal hydraulic forming machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102039691A (en) * 2010-12-28 2011-05-04 平顶山市通运矿山机械厂 PLC control system for pulverized coal hydraulic forming machine

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