JPH01182681A - Motor operated valve driver - Google Patents

Abstract

PURPOSE:To prevent any damage to a motor operated valve due to an overtorque state and an adverse effect exerting a plant being set up in this valve from occurring by eliminating this overtorque state quickly whenever it has occurred in the motor operated valve. CONSTITUTION:If an electric motor comes into an overtorque state during open operation of a motor operated valve, an open directional torque switch 4a1 is turned to ON. If an overtorque signal 25a is reached to the setting time in a timer 29 while the motor operated valve is turned to the overtorque state during its open operation and repeats the close and open operations, an output signal 29a comes to H so that a judging signal 32a comes to L. Consequently, a c.w. command signal 38a and a c.c.w. command signal 39a both are in no case outputted from an input part 35, whereby the motor operated valve comes to a stopped state, so that the overtorque state produced in the motor operated valve is eliminated, and thus any damage to the valve is prevented from occurring.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は１手動または自動操作によって電動弁を駆動す
る装！、特に弁に異物が挾まれ℃その結果電動弁を構成
する電動機に過トルク状態が現れた場合に％該過トルク
状態を速やかに解消して。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for driving an electric valve by manual or automatic operation. In particular, when a foreign object is caught in the valve and as a result an overtorque condition appears in the electric motor constituting the electric valve, the overtorque condition can be quickly resolved.

該過トルク状態が電動弁や該電動弁が設置されているプ
リントに及ぼす悪影響を低減させることができる電動弁
駆動装置に関する。The present invention relates to an electric valve drive device that can reduce the adverse effects of the overtorque state on the electric valve and the print on which the electric valve is installed.

〔従来の技術〕[Conventional technology]

第３図は従来の電動弁駆動装置の構成図である。 FIG. 3 is a configuration diagram of a conventional electric valve drive device.

図においＣ１１は弁体１ａと該弁体を駆動する電動機１
ｂとからなる１！電動弁体、２は本体１に取り付けられ
たスイッチ箱で、このスイッチ箱２には、電動弁本体１
が全開状態になるとオフになる全開リミットスイッチ３
ａと１本体ｌが全閉状態になるとオフになる全閉リミッ
トスイッチ３ｂと。In the figure, C11 is a valve body 1a and an electric motor 1 that drives the valve body.
1 consisting of b! The electric valve body 2 is a switch box attached to the main body 1, and this switch box 2 includes the electric valve body 1.
Fully open limit switch 3 that turns off when fully open
a and a fully closed limit switch 3b that turns off when the main body l is fully closed.

本体１が開動作中に電動機１ｂが過トルク状態釦なると
オフになる開方向トルクスイッチ４ａと。An opening direction torque switch 4a that is turned off when the electric motor 1b is in an overtorque state button while the main body 1 is in an opening operation.

本体１が閉動作中に電動機１ｂが過トルク状態になると
オフになる閉方向トルクスイッチ４ｂとが収められてい
る。５は電動弁本体ｌとスイッチ３ａ、３ｂ、４ａ＊　
４ｂが収められたスイッチ箱２とからなる電動弁で、こ
の電動弁５は商用電源６からブレーカＭＣＢ、電出接触
器８８Ｆ、８８Ｒの図示した各接点、サーマルリレー４
９を順次介し℃給、電されて正転または逆転させられる
ようになっている。８８Ｆは励磁されてその出力接点を
オンにすることにより電動弁５が開動作をするように電
動機１ｂを正転させるための電ｒＢ接触器。A closing direction torque switch 4b that is turned off when the electric motor 1b becomes overtorqued while the main body 1 is in a closing operation is housed. 5 is the electric valve main body l and switches 3a, 3b, 4a*
4b is housed in the switch box 2, and the motorized valve 5 is connected to the commercial power supply 6, the breaker MCB, the contacts of the electric contactors 88F and 88R as shown in the figure, and the thermal relay 4.
9 and is sequentially supplied with temperature and power so that it can be rotated forward or reverse. 88F is an electric rB contactor which rotates the electric motor 1b in the forward direction so that the electric valve 5 opens by turning on its output contact when excited.

８８Ｒは励磁されてその出力接点をオンにすることによ
り電動弁５が閉動作をするように電動機１ｂを逆転させ
るための電磁接触器−７ａ＊７ｂは接触器８８Ｆ、８８
Ｒをそれぞれ励磁するために出力部７から出力される正
転駆動信号、逆転駆動信号で、８は、電源６とブレーカ
ＭＣＢと接触器８８Ｆ及び８８Ｂとこれらの接触器の図
示した接点とリレー４９とからなり、正転駆動信号７ａ
が入力されると電動機１ｂを正転させて電動弁５に開動
作をさせ、逆転駆動信号７ｂが入力されると電動機１ｂ
を逆転させて電動弁５に閉動作をさせる電動機駆動部で
ある。そうし℃、出力部７は。88R is an electromagnetic contactor for reversing the electric motor 1b so that the electric valve 5 closes by being excited and turning on its output contact - 7a*7b are contactors 88F and 88
A forward rotation drive signal and a reverse rotation drive signal are outputted from the output unit 7 to excite R, respectively, and 8 indicates the power supply 6, the breaker MCB, the contactors 88F and 88B, the illustrated contacts of these contactors, and the relay 49. The normal rotation drive signal 7a
When is inputted, the electric motor 1b is rotated in the forward direction to cause the electric valve 5 to open, and when the reverse drive signal 7b is inputted, the electric motor 1b is rotated in the forward direction.
This is an electric motor drive unit that reverses the rotation of the electric valve 5 and causes the electric valve 5 to perform a closing operation. Then, the output section 7 is at ℃.

正転指令信号９ａが入力されるとこの信号９ａが入力さ
れている正転指令期間中正転駆動信号７ａを出力し続け
ると共に前記正転指令期間中に逆転用受信号９ｂが入力
されても逆転駆動信号７ｂを出力しないように構成され
、また、逆転指令信号９ｂが入力されると該信号９ｂが
入力されている逆転指令期間中逆転駆動信号７ｂを出力
し続けると共に前記逆転指令期間中に正転指令信号９ａ
が入力されても正転駆動信号７ａを出力しないように構
成されている。When the forward rotation command signal 9a is input, the forward rotation drive signal 7a continues to be output during the forward rotation command period during which this signal 9a is input, and even if the reverse rotation receiving signal 9b is input during the forward rotation command period, the reverse rotation is performed. The configuration is such that the drive signal 7b is not output, and when the reverse rotation command signal 9b is input, the reverse rotation drive signal 7b continues to be output during the reverse rotation command period during which the signal 9b is input, and the reverse rotation is continued during the reverse rotation command period. Rotation command signal 9a
is configured so as not to output the normal rotation drive signal 7a even if the normal rotation drive signal 7a is input.

ｔｏ、ｔｔは、いずれも、出力部７に向けて、正転指令
信号９ａと逆転指令信号９ｂと停止指令信号９Ｃとのう
ちのいずれかひとつの信号を手操作で出力するようにし
た操作スイッチ％　１２は図示していない信号が入力さ
れることによっ℃所定の自動調節動作を行つ℃出力部７
に正転指令信号９ａまたは逆転指令信号９ｂを出力する
ようにした自動調節器で、この場合、出力部７は停止相
→偏号９Ｃが入力されると駆動信号７ａ、７ｂをいずれ
も消滅させて電動機１ｂを停止させるようになつ℃いる
。１３は、操作スイッチ１１及び自動調節器１２から信
号９ａｅ　９ｂ、ｇＣを出力させるだめに、入力される
制御電源電圧１４ａをスイッチ１１かまたは調節器１２
のいずれか一方に切り換えて、給電するようにした切換
スイッチ、１４は接点５１．５２を介し工入力される制
御電源電圧１５を切り換えてスイッチ１３には制御電源
電圧１４ａとして給電し操作スイッチ１０には制御電源
電圧１４ｂとして給電するようにした切換スイッチで、
電源電圧１４ｂはスイッチ１０から信号９ａ、９ｂ、’
ｊＣを出力させるための電源である。to and tt are operation switches that manually output any one of a forward rotation command signal 9a, a reverse rotation command signal 9b, and a stop command signal 9C toward the output section 7. % 12 is a temperature output unit 7 that performs a predetermined temperature automatic adjustment operation by inputting a signal (not shown).
This is an automatic regulator that outputs a forward rotation command signal 9a or a reverse rotation command signal 9b.In this case, the output section 7 eliminates both the drive signals 7a and 7b when the stop phase→deviation signal 9C is input. ℃ to stop the electric motor 1b. 13 connects the input control power supply voltage 14a to the switch 11 or the regulator 12 in order to output the signals 9ae, 9b, and gC from the operation switch 11 and the automatic regulator 12.
The changeover switch 14 switches the control power supply voltage 15 that is input via contacts 51 and 52 to supply power to the switch 13 as the control power supply voltage 14a, and supplies power to the operation switch 10. is a changeover switch that supplies power as the control power supply voltage 14b,
The power supply voltage 14b is supplied from the switch 10 by the signals 9a, 9b,'
This is a power supply for outputting jC.

接点５１はＭＣＢがオンにされると該ＭＣＢの動作釦連
動し℃オンにされる接点、接点５２はＭｅＢがトリップ
するかまたはサーマルリレー４９が動作するかするとオ
フにされる接点で、第３図九おいては、スイッチ１１及
び１３と調節器１２とは電動弁５が設置された図示して
いないプラントを制御する中央制御室１６に設置され、
スイッチ１１゜１３及び調節器１２を除（図示の各部は
すべ℃現場に設置されている。スイッチ１０及び１１は
電動弁５を手動操作するために設けられ℃いる。A contact 51 is a contact that is turned on in conjunction with the operation button of the MCB when the MCB is turned on, and a contact 52 is a contact that is turned off when the MeB trips or the thermal relay 49 is activated. In FIG. 9, switches 11 and 13 and regulator 12 are installed in a central control room 16 that controls a plant (not shown) in which an electric valve 5 is installed.
Except for the switches 11 and 13 and the regulator 12, all the parts shown are installed at the site.Switches 10 and 11 are provided for manual operation of the electric valve 5.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

第３図ではスイッチ箱２内が図示のようｌＣ＠続さね、
またスイッチ箱２以外の各部が上述のように構成されて
いるので、電動弁５をスイッチ１０゜１１で手動操作し
調節器１２で自動操作しうろことが明らかであり、また
電動弁５は全開または全開になったりあるいは電動機１
ｂが過トルク状態になってスイッチ４ａ＠４ｂがオフに
なったりすると自動的に停止することが明らかである。In Figure 3, the inside of the switch box 2 is shown as shown in the diagram.
Furthermore, since each part other than the switch box 2 is configured as described above, it is clear that the electric valve 5 can be manually operated with the switches 10 and 11 and automatically operated with the regulator 12, and the electric valve 5 can be fully opened. or fully open or motor 1
It is clear that if the switch 4a@4b is turned off due to an overtorque state of the motor b, the motor will automatically stop.

ところが、第３図の場合、トルクスイッチ４ａまたは４
ｂがオフになって電動弁５が停止すると、従来。However, in the case of Fig. 3, the torque switch 4a or 4
When b is turned off and the electric valve 5 stops, the conventional

スイッチ１０または１１を用いて１手繰作で、電動機１
ｂが正転中に停止したものであれば該電動機を逆転させ
電動機１ｂが逆転中に停止したものであれば該電動機を
正転させて過トルク状態を解消させるようにしている。With one operation using switch 10 or 11, motor 1
If the motor 1b has stopped during normal rotation, the motor is reversed, and if the motor 1b has stopped during reverse rotation, the motor is rotated in the normal direction to eliminate the overtorque state.

したかつ″Ｃ１第３図においては電動機ｔｂの過トルク
状態及び電動弁５の停止状態の解消に長時間を要するこ
とになって。However, in "C1" in FIG. 3, it takes a long time to eliminate the overtorque state of the electric motor tb and the stopped state of the electric valve 5.

この結果、第３図の電動弁駆動装置には、過トルク状態
の発生によって電動弁５が損傷したり前述のプラントの
動作が不調になったりして、過トルク状態の電動弁５や
前記プラントに及ぼす悪影響の度合いが強いという問題
点があることになる。As a result, in the electric valve driving device shown in FIG. 3, the electric valve 5 may be damaged due to the occurrence of an overtorque condition, or the operation of the aforementioned plant may become malfunctioning. This means that there is a problem in that the degree of negative impact on

零発、ＢＡの目的は、電動弁に過トルク状態が発生した
場合、該状態を迅速に解消し℃、前記過トル’７状態が
電動弁や該弁が設置されているプラントに及ぼす悪影響
を低減させるようにすることにある。The purpose of zero start and BA is to quickly resolve the overtorque condition when an overtorque condition occurs in the electric valve, and to prevent the adverse effects that the overtorque condition has on the electric valve and the plant where the valve is installed. The purpose is to reduce the

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するために１本発明によれば、電動弁
が全開状態にあるか否かに応じた第１信号と前記電動弁
が開方向の過トルク状態にあるか否かに応じた第２信号
と前記電動弁が全開状態にあるか否かに応じた第３信号
と前記電動弁が閉方向の過トルク状態にあるか否かに応
じた第４信号とを出力する電動弁動作状態検出部と；前
記第１乃至第４信号が入力され前記電動弁が全開及び全
閉のいずれの状態にもなくてかつ前記電動弁が前記開方
向または前記閉方向のいずれかの過トルク状態になると
過トルク偏号を出力する過トルク状態検出部と；前記過
トルク償号が入力され該過トルり信号の入力態様に応じ
た所定の信号判定処理を行ってその結果に対応した過ト
ルク判定信号を出力する過トルク発生状態判定部と；前
記第１及び第２償号と前記過トルク判定信号と開指令信
号とが入力され前記電動弁が全開状！！！になくかつ前
記電動弁が前記開方向の過トルク状態になくかつ前記過
トルク判定信号が前記電動弁のり帰動作を禁止する弁復
帰動作禁止信号である場合に前記開指令信号に応じた第
１中継信号を出力する４入力の第１テンド回路と、前記
第３及び第４信号と前記過トルク判定信号と開指令信号
とが入力され前記電動弁が全閉状態になくかつ前記電動
弁が前記閉方向の過トルク状態にな（かつ前記過トルク
判定信号′が前記弁復帰動作禁止信号である場合に前記
閉指４Ｐ信号に応じた第２中継信号を出力する４入力の
第２アンド回路とが設けられ、前記過トルク判足信号が
前記弁復帰動作禁止信号である場合には前記第１中継信
号に応じた信号な正転指令信号として出力すると共に前
記第２中継信号に応じた信号を逆転指令信号として出力
し、前記過トルク判定信号が前記電動弁の復帰動作を許
可する弁復帰動作許可信号である場合には前記開指令信
号に応じた。信号を前記逆転指令信号として出力すると
共に前記閉指令信号に応じた信号を前記正転指令信号と
して出力する入力部と；前記正転指令信号が入力される
と該正転指令信号が入力され℃いる正転指令期間中正転
駆動信号を出力し続けると共に前記正転指令期間中に前
記逆転指令信号が入力されても逆転駆動信号を出力しな
いようにし、前記逆転指令信号が入力されると該逆転指
令信号が入力されている逆転指令期間中前記逆転駆動信
号を出力し続けると共に前記逆転指令期間中に前記正転
指令信号が入力されても前記正転駆動信号を出力しない
ようにする出力部と；前記正転駆動信号が入力さｉする
と前記電動弁の電動機秦を正転させて前記電動弁に開動
作をさせ前記逆転駆動信号が入力されると前記電動機を
逆転させて前記電動弁に閉動作をさせる電動機駆動部と
；前記開指令信号及び前記開指令信号を出力信号として
出力する制御部とを備え、前記制御部の前記出力信号に
もとづき前記電動機駆動部によって前記電動弁を駆動す
るものであって、前記過トルク発生状態判定部が行う前
記信号判定処理は、前記過トルク発生状態判定部に前記
過トルク信号が入力されない時は前記過トルク判定信号
として弁復帰動作禁止信号を出力させ、／１記過トルク
発生状態判定部に前記過トルク信号が入力された時該過
トルク信号のこの入力動作回数が所定回数未満であれば
直ちに前記弁復帰動作許可信号を前記過トルク判定信号
として出力させ、前記過トルク発生状態判定部が前記弁
復帰動作許可僧号を出力している最中に前記過トルク信
号が所だ時間未満の継続時間で消滅するかまたはｉｌｌ
記過トルク信号の継続時間が前記所定時間に到達するか
すると前記弁復帰動作禁止信号を前記過トルク判定信号
として出力させ。In order to solve the above problems, according to the present invention, a first signal depending on whether the electric valve is in a fully open state and a first signal depending on whether the electric valve is in an overtorque state in the opening direction. A motorized valve operation that outputs a second signal, a third signal depending on whether the motorized valve is in a fully open state, and a fourth signal depending on whether or not the motorized valve is in an overtorque state in the closing direction. a state detection unit; when the first to fourth signals are input, the motorized valve is neither fully open nor fully closed, and the motorized valve is in an overtorque state in either the opening direction or the closing direction; an overtorque state detection unit that outputs an overtorque deviation signal when the overtorque compensation signal is input; performs a predetermined signal judgment process according to the input mode of the overtorque signal, and detects an overtorque corresponding to the result; an overtorque occurrence state determination section that outputs a determination signal; the first and second compensation signals, the overtorque determination signal, and the open command signal are input, and the electric valve is fully open! ! ! a first response to the opening command signal when the electrically operated valve is not in an overtorque state in the opening direction and the overtorque determination signal is a valve return operation prohibition signal that prohibits the electrically operated valve from returning; A 4-input first tend circuit that outputs a relay signal, the third and fourth signals, the overtorque determination signal, and the open command signal are input, and the electric valve is not in a fully closed state and the electric valve is in the a 4-input second AND circuit that outputs a second relay signal according to the closing finger 4P signal when the overtorque state is in the closing direction (and the overtorque determination signal' is the valve return operation prohibition signal); is provided, and when the overtorque detection signal is the valve return operation prohibition signal, it outputs a normal rotation command signal that is a signal that corresponds to the first relay signal, and also outputs a signal that corresponds to the second relay signal. If the overtorque determination signal is a valve return operation permission signal that permits the return operation of the motor-operated valve, it corresponds to the opening command signal.The signal is output as the reverse rotation command signal, and an input section that outputs a signal corresponding to the close command signal as the forward rotation command signal; when the forward rotation command signal is input, the forward rotation drive signal is output during the forward rotation command period during which the normal rotation command signal is inputted; In addition to continuing to output the reverse rotation command signal, even if the reverse rotation command signal is input during the forward rotation command period, the reverse rotation drive signal is not output, and when the reverse rotation command signal is input, the reverse rotation command signal is input during the reverse rotation command period. an output unit that continues to output the reverse rotation drive signal and does not output the forward rotation drive signal even if the forward rotation command signal is input during the reverse rotation command period; Then, a motor driving unit rotates the electric motor of the electric valve in the normal direction to cause the electric valve to perform an opening operation, and when the reverse rotation drive signal is input, rotates the electric motor in the reverse direction to cause the electric valve to perform a closing operation; a control unit that outputs a command signal and the opening command signal as an output signal, the electric valve is driven by the motor drive unit based on the output signal of the control unit, and the overtorque generation state determination is performed. The signal determination processing performed by the overtorque occurrence state determination section includes: outputting a valve return operation prohibition signal as the overtorque determination signal when the overtorque signal is not input to the overtorque occurrence state determination section; When the overtorque signal is input, if the number of input operations of the overtorque signal is less than a predetermined number of times, the valve return operation permission signal is immediately output as the overtorque determination signal, and the overtorque occurrence state determination section During the output of the valve return operation permission signal, the overtorque signal disappears for a duration less than the specified time or ill.
When the duration of the overtorque signal reaches the predetermined time, the valve return operation prohibition signal is output as the overtorque determination signal.

前記過トルク発生状態判定部に前記過トルク省号が入力
された時該過トルク信号のこの入力ｗＪ作回数が前記所
定回数に一致していると前記過トルク信号の入力動作に
かメヘず前記過トルク判定信号として前記弁復帰動作禁
止信号を出力させ続ける信号処理動作であるようにし℃
電動弁駆動装置を構成するものとする。When the overtorque state number is input to the overtorque generation state determining section, if the number of input wJ operations of the overtorque signal matches the predetermined number of times, the input operation of the overtorque signal will not work. The signal processing operation continues to output the valve return operation prohibition signal as an overtorque judgment signal.
It shall constitute an electric valve drive device.

〔作、用〕[work, use]

上記のように構成すると、を動弁が過トルク状態になっ
て過トルク状慾検出部から過トルク信号が出力された場
合、この過トルク信号の発生回数が過トルク発生状態判
定部におい℃設定された所定回数Ｎｓ忙達していないと
直ちに電動弁が過トルク信号発生時の動作方向とは逆の
方向に駆動され℃過トルク状態の解消が図られ、この過
トルク状態解消動作により℃上記の過トルク信号が消滅
すると再び電動弁は過トルク償号発生時の動作方向と同
じ方向に駆動される。そうし′ｃ、電動弁が再び過トル
ク状態になると再び電動弁が逆の方向に駆動される。そ
うして、電動弁がこのような往復動作を繰り返すうち、
過トルク僧号の生じている時間が過トルク発生状態判定
部において設定された所定時間ＴＳに到達するかまたは
過トルク信号の発生回数が前記回数Ｎｓに到達すると、
電動機駆動部に正転駆動信号も逆転駆動信号°も入力さ
れなくなって電動弁が停止状態になる。故に１本発明の
電動弁駆動装置によれば、過トルク状態が発生した時、
自動的に電動弁が逆方向に駆動され、この逆方向駆動が
所定回数式られるかまたは逆方向駆動による電動弁の逆
方向動作が不可能であると自動的に電動弁が停止状ｔ！
ＩＶＣされるので、［動弁に過トルク状態が発生した場
合核状態が迅速に解消されて、前記過トルク状態の電動
弁や該弁が設置されているプラントに及ぼす悪影響が低
減されることになる。With the above configuration, when the valve train is in an overtorque state and an overtorque signal is output from the overtorque state detection section, the number of occurrences of this overtorque signal is determined by the temperature setting in the overtorque occurrence state determination section. If the predetermined number of times Ns has not been reached, the electric valve is immediately driven in the opposite direction to the direction of operation when the overtorque signal was generated to eliminate the overtorque condition. When the overtorque signal disappears, the electric valve is driven again in the same direction as the operating direction when the overtorque compensation signal occurred. Then, when the motor-operated valve becomes overtorqued again, the motor-operated valve is driven in the opposite direction again. Then, as the electric valve repeats this kind of reciprocating operation,
When the time during which the overtorque signal occurs reaches a predetermined time TS set in the overtorque occurrence state determining section, or when the number of occurrences of the overtorque signal reaches the number Ns,
Neither the forward rotation drive signal nor the reverse rotation drive signal ° is input to the motor drive unit, and the motor-operated valve is brought to a stopped state. Therefore, according to the electric valve drive device of the present invention, when an overtorque condition occurs,
The motor-operated valve is automatically driven in the reverse direction, and when this reverse drive is performed a predetermined number of times or when the motor-operated valve cannot be operated in the reverse direction by the reverse drive, the motor-operated valve automatically stops.
Since IVC is applied, [if an overtorque state occurs in the valve train, the nuclear state is quickly resolved, and the negative impact on the electric valve in the overtorque state and the plant where the valve is installed is reduced.] Become.

〔実施例〕〔Example〕

第１図は本発明の一実施例の構成図、第２図は第１図に
おける要部の配置及び接続状態を説明する説明図である
。第１図及び第２図におい℃第３図におけるものと同じ
機能を有する部分には同じ符号が付し℃ある。FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram illustrating the arrangement and connection state of the main parts in FIG. 1. In FIGS. 1 and 2, parts having the same functions as those in FIG. 3 are designated by the same reference numerals.

第１図及び第２図において、３ａｌは電動弁５が全開に
なるとオンになるリミットスイッチ、３ｂ１は電動弁が
全閉になるとオンになるリミットスイッチ、４ａ１は電
動弁５が開動作中に電動機！ｂが過トルク状態になると
オンになる開方向トルクスイッチ、４ｂ１は電動弁５が
閉動作中に電動機　！ｂが過トルク状態になるとオンに
なる閉方向トルクスイッチで、１７はスイッチａａｔと
４ａｌと３ｂｌと４ｂ１とからなり、これらのスイッチ
からいずれも二値倍器である所の第１信号ｔ８ａ、ｇ２
（！号１８ｂ、第３信号１８Ｃ１第４信号１８ｄをそれ
ぞれ出力させるようにした電動弁動作状態検出部である
。検出部１７を１．この場合、スイッチ箱２内に設けら
れ℃いる。１９．２０は第３図の操作スイッチ１１．自
動調節器１２のそれぞれに対応した操作スイッチ、自動
調節器で、これらはいずれも第３図の正転指令信号９ａ
Ｋかわる開指＋ｍ号２１ａと逆転指令信号９ｂにかわる
閉指Ａ？伽号２１ｂとを出力するように構成され、切換
スイッチ１３と操作スイッチ１９と自動調節器２０とか
らなる役 制御部２２が第２図の場合にも制御室１６ｊＣ４’置さ
れている。２３は電動弁動作状態検出部１７が出力する
信号ｔＳａ〜１８ｄと制御部２２が出力する信号２１８
．２１ｂと制御電源電圧１４８である所の運転許可信号
２４とが入力されて、以下に説明する動作を行う信号処
理部である。In FIGS. 1 and 2, 3al is a limit switch that is turned on when the electric valve 5 is fully open, 3b1 is a limit switch that is turned on when the electric valve is fully closed, and 4a1 is a limit switch that is turned on when the electric valve 5 is fully closed. ! 4b1 is a torque switch in the opening direction that is turned on when b is in an overtorque state, and 4b1 is a motor-operated switch that is turned on when the electric valve 5 is closed. b is a closing direction torque switch that is turned on when an overtorque state occurs; 17 is composed of switches aat, 4al, 3bl, and 4b1, and from these switches first signals t8a and g2, which are all binary multipliers;
(This is an electric valve operation state detection unit that outputs the number 18b, the third signal 18C, and the fourth signal 18d, respectively.The detection unit 17 is 1. In this case, it is installed in the switch box 2. 19. Reference numeral 20 indicates an operation switch and an automatic regulator corresponding to the operation switch 11 and automatic regulator 12 shown in FIG.
Open finger instead of K+m number 21a and closed finger A instead of reverse command signal 9b? Also in the case of FIG. 2, a winning control section 22 configured to output a signal 21b and consisting of a changeover switch 13, an operation switch 19, and an automatic adjuster 20 is placed in the control room 16jC4'. 23 are signals tSa to 18d outputted by the electric valve operating state detection unit 17 and a signal 218 outputted by the control unit 22.
．． 21b and the operation permission signal 24, which is the control power supply voltage 148, are input thereto, and is a signal processing section that performs the operations described below.

すなわち、第１図におい℃、２５は、第１信号１８ａの
否定９号と第２信号１８ｂとが入力されるアンド回路２
５１と、第３信号１８Ｃの否写儒信号と第４信号１８ｄ
とが入力されるアンド回路２５２と１両回路の各出力信
号が共に入力されるオア回路２５３とからなり、電動弁
５が全開及び全閉のいずれの状態にもなく℃かつ約記弁
５が開方向または閉方向のいずれかの過トルク状態にな
るとｒＨＪレベルの過トルク信号２５ａをオア回路２５
３の出力信号として出力する過トルク状態検出部、２６
は運転許可信号２４が入力されていてかつリセットスイ
ッチ２７がオフであるとオア回路２５３の出力信号に応
じた信号を出力信号２６ａとして出力するアンドゲート
で、この場合出力信号２６ａは、カウンタ２８とタイマ
２９とオアゲー）３０とアンドゲート３１とからなる過
トルク発生状態判定部３２に図示のように入力され℃い
る。ここに、カウンタ２８は入力される信号２６ａが過
トルク信号２５ａの状態であるｒＨＪレベルになるごと
に計数を行ってこの計数値が前述したＮｓに到達すると
ｒＨＪレベルとなる二値信号２８１１を出力し、リセッ
トスイッチ２７をオンにすると、上記計数値をリセット
して信号２８ＨのレベルなｒＬＪレベルに復帰させるよ
うに構成され。That is, in FIG. 1, ℃ 25 is the AND circuit 2 to which the negative number 9 of the first signal 18a and the second signal 18b are input.
51, the third signal 18C and the fourth signal 18d.
It consists of an AND circuit 252 to which is input and an OR circuit 253 to which each output signal of both circuits is input. When an overtorque state occurs in either the opening direction or the closing direction, the overtorque signal 25a at the rHJ level is sent to the OR circuit 25.
an overtorque state detection section 26 that outputs as an output signal of 3;
is an AND gate that outputs a signal corresponding to the output signal of the OR circuit 253 as the output signal 26a when the operation permission signal 24 is input and the reset switch 27 is off. As shown in the figure, the torque is inputted to an overtorque generation state determining section 32 that includes a timer 29, an ORG 30, and an AND gate 31. Here, the counter 28 counts each time the input signal 26a reaches the rHJ level, which is the state of the overtorque signal 25a, and outputs a binary signal 2811 that becomes the rHJ level when this counted value reaches the aforementioned Ns. However, when the reset switch 27 is turned on, the count value is reset and returned to the rLJ level, which is the level of the signal 28H.

またタイマ２９は入力される信号２６ａが過トルク慣号
２５ａの状態であるｒＨＪレベルになると計時動作を開
始してこの計時結果が前述した時間Ｔｓに到達するとｒ
ＨＪレベルとなる二値信号２９ａを出力し、入刃信号２
６ａがｒＬＪレベルになると計時結果をリセットするよ
うに構成されている。Further, the timer 29 starts timing operation when the input signal 26a reaches rHJ level, which is the state of overtorque inertia 25a, and when the timing result reaches the above-mentioned time Ts, r
Outputs the binary signal 29a that becomes the HJ level, and outputs the cutting edge signal 2.
6a reaches the rLJ level, the timing result is reset.

さ′ｃ、過トルク発生状態判定部３２忙おいては上述し
た汐つンタ２８とタイマ２９とオアゲート３０とアンド
ゲート３１とが図示のように接続され℃いるので、この
判定部３２は、アンドゲート２６からｒＬＪレベルの信
号２６ａが出力され℃いる状態、つまりゲート２６を介
して過トルク信号２５ａが入力され℃いない状態では、
アンドゲート３１の出力信号としての過トルク判定信号
３２ａをｒＬＪレベル忙して出力する。ところが、アン
ドゲート２６を介して過トルク信号２５ａが判定部３２
に入力された時、信号２５ａの判定部３２への入力動作
回数Ｎがカウンタ２８における前述の設定計数値Ｎ８未
満であると、カウンタ２Ｂ及びタイマ２９の各出力は変
化しないので、直ちに信号３２ａがｒＨＪレベルになる
。そうし℃、このようにして信号３２！１がｒＨＪレベ
ルになつ℃いる最中に、過トルク信号２５ａが前述のタ
イマ設定時間Ｔｓ未満の継続時間で消滅して出力信号２
６ａがｒＬＪレベルになるか、または信号２５ａの継続
時間が設定時間Ｔｓｌｃ到達し一タイマ２９からｒＨＪ
レベルの信号２９ａが出力されるかすると、信号３２ａ
がｒＬＪレベルに復帰する。判定部３２にゲート２６を
介して過トルク信号２５ａが入力された・時、前記の入
力回数Ｎが前記設電計数値Ｎａに一致していると、カウ
ンタ２８が直ちにＨレベルの信号ｚｓａｖ出力するので
、この場合、信号２５ａの判定部３２へのこのような入
力動作にかかわらず過トルク判定信号３２ａは「Ｌ」レ
ベルな継続することになる。In the overtorque generation state determining section 32, the above-mentioned output terminal 28, timer 29, OR gate 30, and AND gate 31 are connected as shown in the figure, so this determining section 32 When the rLJ level signal 26a is output from the gate 26 and the temperature is ℃, that is, when the overtorque signal 25a is input through the gate 26 and the temperature is not ℃,
An overtorque determination signal 32a as an output signal of the AND gate 31 is output at rLJ level. However, the overtorque signal 25a is transmitted through the AND gate 26 to the determination unit 32.
If the number of input operations N of the signal 25a to the determination unit 32 is less than the aforementioned set count value N8 in the counter 28, the outputs of the counter 2B and the timer 29 will not change, so the signal 32a will be input immediately. It becomes rHJ level. Then, while the signal 32!1 reaches the rHJ level in this way, the overtorque signal 25a disappears for a duration shorter than the above-mentioned timer setting time Ts, and the output signal 2
6a reaches the rLJ level, or the duration of the signal 25a reaches the set time Tslc, and the timer 29 indicates rHJ.
When the level signal 29a is output, the signal 32a
returns to rLJ level. When the overtorque signal 25a is input to the determination unit 32 via the gate 26, if the number of inputs N matches the design value Na, the counter 28 immediately outputs an H level signal zsav. Therefore, in this case, the overtorque determination signal 32a continues to be at the "L" level regardless of such input operation of the signal 25a to the determination unit 32.

３３は、第１及び第２信号ｔｓａ、ｔａｂと過トルク判
定信号３２ａと開指＋信号２１ａとが入力され、、ｖ１
動弁５が全開状態にな（かつ該電動弁が開方向の過トル
ク状９ＶＣな（かつ過トルク判定信号３２ａがｒＬＪレ
ベルである場合に開指令信号２１ａに応じた第１中継信
号を出力信号３３ａとして出力するようにした第１アン
ド回路、３４は、第３及び第４信号１８Ｃ，１８ｄと過
トルク判定信号３２ａと閉指令信号２１ｂとが入力され
、弁５が全閉状態になくかつ弁５が閉方向の過トルク状
態になくかつ信号３２ａがｒＬＪレベルである場合に開
指令信号２１ｂに応じた第２中継信号を出力信号３４ａ
として出力するようにした第２アンド回路で、３５は判
定信号３２ａと開指令信号２１ｂとが入力されるアンド
回路３６と１判定部号３２ａと開指令信号２１１ｍとが
入力されるアンド回路３７と、出力信号３３ａとアンド
回路３６の出力信号とが入力されるオア回路３８と、出
力信号３４ａとアンド回路３７の出力信号とが入力され
るオア回路３９とからなる入力部である。入力部３５は
上述のように構成されてい一’Ｃ，Ｌかも。33 receives the first and second signals tsa and tab, the overtorque determination signal 32a, and the finger open signal 21a, and v1
When the valve train 5 is fully open (and the electric valve is in an overtorque state of 9VC in the opening direction) (and the overtorque determination signal 32a is at the rLJ level), the first relay signal corresponding to the open command signal 21a is output. The third and fourth signals 18C and 18d, the overtorque determination signal 32a, and the close command signal 21b are input to the first AND circuit 34, which outputs the signal as 33a, and the valve 5 is not in the fully closed state and the valve 5 is not in the fully closed state. 5 is not in an overtorque state in the closing direction and the signal 32a is at the rLJ level, the second relay signal corresponding to the open command signal 21b is outputted to the signal 34a.
35 is an AND circuit 36 to which the judgment signal 32a and the open command signal 21b are input, an AND circuit 37 to which the 1 judgment part number 32a and the open command signal 211m are input. , an OR circuit 38 to which the output signal 33a and the output signal of the AND circuit 36 are input, and an OR circuit 39 to which the output signal 34a and the output signal of the AND circuit 37 are input. The input section 35 is configured as described above.

後述する所から明らかなように、オア回路３８の出力信
号３８ａが該信号がｒＨＪレベルになることによりて電
動機１ｂに正転を指→する信号であり、かつオア回路３
９の出力信号３９ａが該信号がｒＨＪレベルになること
によって電動機１ｂに逆転を指令する信号であるので、
上述の入力部３５は、過トルク判定信号３２ａがｒＬＪ
レベルである場合には第１中継信号３３ａＫ応じた信号
３８ａを正転指令信号として出力すると共に第２中継信
号３４８に応じた信号３９ａを逆転指令信号として出力
し、信号３２ａがｒＨＪレベルである場合には開指令信
号２１ａに応じた信号３９ａを逆転指令信号として出力
すると共に開指令信号２１ｂ６′ｃ応じた信号３８ａを
正転指令信号として出力するように構成されているとい
うことができる。As is clear from what will be described later, the output signal 38a of the OR circuit 38 is a signal that instructs the motor 1b to rotate in the normal direction when the signal reaches the rHJ level, and the OR circuit 38
Since the output signal 39a of 9 is a signal that instructs the electric motor 1b to reverse rotation when the signal reaches the rHJ level,
The above-mentioned input section 35 is configured so that the overtorque determination signal 32a is rLJ.
If the signal 32a is at the rHJ level, the signal 38a corresponding to the first relay signal 33aK is output as a forward rotation command signal, and the signal 39a corresponding to the second relay signal 348 is output as a reverse rotation command signal, and if the signal 32a is at the rHJ level It can be said that the configuration is such that a signal 39a corresponding to the open command signal 21a is outputted as a reverse rotation command signal, and a signal 38a corresponding to the open command signal 21b6'c is outputted as a forward rotation command signal.

４０は運転許可信号２４と正転指令信号３８ａと出力信
号４１ａの否定信号とが入力されて信号４０ａを出力す
る三人カアンド回路、４１は運転許可信号２４と逆転指
令信号３９ａとアンド回路４０の出力信号４０ａの否定
信号とが入力されて前述の信号４１ａを出力する三入力
のアンド回路。40 is a three-person AND circuit into which the operation permission signal 24, the forward rotation command signal 38a, and the negative signal of the output signal 41a are input, and outputs the signal 40a; 41 is the operation permission signal 24, the reverse rotation command signal 39a, and the AND circuit 40; A three-input AND circuit which receives the negative signal of the output signal 40a and outputs the aforementioned signal 41a.

４２は、入力されるｒＨＪレベルの信号４０ａを所定時
間遅らせて正転駆動信号７ａとして出力するタイマ、４
３は入力されるｒＨＪレベルの信号４１ａを所定時間遅
らせて逆転駆動信号７ｂとして出力するタイマで、４４
は前述したアンド回路４０゜４１とタイマ４２．４３と
からなる出力部である。A timer 42 delays the input rHJ level signal 40a for a predetermined period of time and outputs the delayed rotation drive signal 7a.
3 is a timer that delays the input rHJ level signal 41a for a predetermined time and outputs it as a reverse rotation drive signal 7b;
is an output section consisting of the above-mentioned AND circuit 40.41 and timers 42 and 43.

出力部４４は、上述′のように構成されているので、信
号２４がｒＨＪレベル九なつ℃いろと、正転指令信号３
８ａが逆転指令信号３９ａよりも先に入力された場合、
該信号３８ａが入力され℃いる正転指令期間中正転駆動
信号７ａを出力し続けると共に前記正転指令期間中に逆
転指令信号３９ａが入力されても逆転駆動信号７ｂを出
力しないよう和し、逆転指令信号３９ａが信号３８ａよ
りも先忙入力された場合、信号３９ａが入力され℃いる
逆転指令期間中逆転駆動信号７ｂを出力し続けると共に
前記逆転指令期間中に正転指令信号３８ａが入力されて
も正転駆動信号７ａを出力しないようにしたものである
ということになる。なお、上述したタイマ４２．４３は
、駆動信号７ａと７ｂとが同時に出力され″Ｃ電動弁５
に短絡事故が発生することのないようにするために設け
られ℃いる。Since the output section 44 is configured as described above, the signal 24 is output from the rHJ level to the normal rotation command signal 3.
8a is input before the reverse rotation command signal 39a,
During the normal rotation command period in which the signal 38a is input, the forward rotation drive signal 7a continues to be output, and even if the reverse rotation command signal 39a is input during the normal rotation command period, the reverse rotation drive signal 7b is not outputted. When the command signal 39a is input earlier than the signal 38a, the reverse rotation drive signal 7b continues to be output during the reverse rotation command period when the signal 39a is input, and the forward rotation command signal 38a is input during the reverse rotation command period. This also means that the normal rotation drive signal 7a is not outputted. Note that the above-mentioned timers 42 and 43 output the drive signals 7a and 7b at the same time, and
This is provided to prevent short-circuit accidents from occurring.

５３は電動弁５が逆動作し℃いることを表示燈５４に表
示させるようにしたオア回路である。Reference numeral 53 is an OR circuit that causes the indicator light 54 to indicate that the electric valve 5 is operating in reverse.

前述した信号処理部２３は上述の過トルク状態検出部２
５とアンドゲート２６とリセットスイッチ２７と過トル
ク発生状態判定部３２と入力部３５と出力部４４とオア
回路５３と表示燈５４とで構成され工いて、第１図及び
第２図においては、この信号処理部２３と電動弁動作状
態検出部１７と制御部２２と電動機駆動部８と接点５１
．５２と切換スイッチ１４とで￥！を動弁駆動装置４５
が構成さハている。The above-mentioned signal processing section 23 is the above-mentioned overtorque state detection section 2.
In FIG. 1 and FIG. 2, The signal processing section 23, the electric valve operating state detection section 17, the control section 22, the motor drive section 8, and the contact point 51
．． 52 and changeover switch 14 for ¥! The valve drive device 45
It is configured ha.

駆動装置４５は上述のように構成され℃いるの視杉 で、電動弁５が全開、全閉のいずれの状態でも電動機１
ｂに過トルク状態が発生し℃いない状態では、信号処理
部２，３に開、閉の両指少信号２１３゜２１ｂが共に入
力されないと、信号処理￥！１５２３から正転、逆転の
周駆動信号７　ａ　＊　７　ｂが出力されることはない
ので、電動弁５は停止状態にある。The drive device 45 is configured as described above, and the electric motor 1 is operated when the electric valve 5 is fully open or fully closed.
When an overtorque state does not occur at point b and temperature is not exceeded, unless both the open and close finger signals 213 and 21b are input to the signal processing sections 2 and 3, the signal processing ￥! Since the circumferential drive signals 7 a * 7 b for normal rotation and reverse rotation are not outputted from 1523, the electric valve 5 is in a stopped state.

そこで・、運転許可信号２４をｒＨＪレベルにし℃おい
℃入力部３５にｒＨＪレベルの開指令信号２１ａを入力
すると、この時過トルク信号３２ａは「Ｌ」レベル状態
にあるので出力部４４から正転駆動信号７ａが出力され
て電動弁５が開動作をする。Therefore, when the operation permission signal 24 is set to the rHJ level and the open command signal 21a at the rHJ level is input to the input section 35, the overtorque signal 32a is at the "L" level, so the output section 44 outputs the forward rotation. The drive signal 7a is output and the electric valve 5 performs an opening operation.

また、　４Ｍ号２４がｒＨＪレベルの時、「Ｈ」レベル
の閉指令信号２１ｂが入力部３５に入力されると弁５は
閉動作をする。そうし″Ｃ１弁５が開動作をし℃遂にリ
ミットスイッチ３ａｔがオンになり。Furthermore, when the No. 4M signal 24 is at the rHJ level, when the "H" level close command signal 21b is input to the input section 35, the valve 5 performs a closing operation. Then, the C1 valve 5 opens and the limit switch 3at finally turns on.

この結果信号ｔｅａがｒＨＪレベルになると、第１中ｊ
迷償号３３ａがｒＬＪになるので電動弁５は停止する。As a result, when the signal tea reaches the rHJ level, the first
Since the stray signal 33a becomes rLJ, the electric valve 5 stops.

また、弁５が閉動作をしてリミットスイッチ３ｂｌがオ
ンになった場合にも弁５は停止状態忙なる。Also, when the valve 5 is closed and the limit switch 3bl is turned on, the valve 5 is in a stopped state.

ところで、信号２４がｒＨＪの時に、弁５が開動作をし
ていて過トルク状態になり、この結果トルクスイッチ４
ａｌがオンになると第２偏号１８ｂがｒＨＪになるので
第１中継信号３３ａが「Ｌ」になる。また、この時オア
回路２５３の出力信号がｒＨＪになってこの結果アンド
ゲートの出力部＠２６ａがｒＨＪになるので、過トルク
判定償号３２ａがｒ　ＨＪになる。しかるに、この場合
、開指令信号２１ａが既にｒＨＪになっているので入力
部３５からｒＨＪレベルの逆転指令信号３９ａが出力さ
れて、その結果出力部４４から逆転駆動信号７ｂが出力
されることになるので、電動弁５が閉動作を開始して弁
５の開方向の過トルク状態が直ちに解消され、この結果
弁５の損傷が防止される。そうして、弁５の閉動作に伴
ってトルクスイッチ４ａｌがオフになると過トルク信号
２５ａがｒＬＪになってこのため過トルク判定偏号３２
ａがｒＬＪになるので、逆転指令信号３９ａの出力が遮
断されると同時１ｃ　ｒＨＪレベルの開指令信号２１Ｈ
に応じたｒＨＪレベルの正転指令信号３８ａが入力部３
５から出力されて、電動弁５は再び開動作を行うことに
なる。By the way, when the signal 24 is rHJ, the valve 5 is in the opening operation and an overtorque state occurs, and as a result, the torque switch 4
When al is turned on, the second polarization signal 18b becomes rHJ, so the first relay signal 33a becomes "L". Further, at this time, the output signal of the OR circuit 253 becomes rHJ, and as a result, the output part @26a of the AND gate becomes rHJ, so the overtorque determination compensation signal 32a becomes rHJ. However, in this case, since the open command signal 21a is already at rHJ, the input section 35 outputs the reverse rotation command signal 39a at the rHJ level, and as a result, the output section 44 outputs the reverse rotation drive signal 7b. Therefore, the electrically operated valve 5 starts the closing operation, and the overtorque condition in the opening direction of the valve 5 is immediately eliminated, and as a result, damage to the valve 5 is prevented. Then, when the torque switch 4al is turned off with the closing operation of the valve 5, the overtorque signal 25a becomes rLJ, and therefore the overtorque judgment error signal 32
Since a becomes rLJ, when the output of the reverse command signal 39a is cut off, the open command signal 21H at the 1c rHJ level simultaneously
The forward rotation command signal 38a at the rHJ level corresponding to
5, and the electric valve 5 performs the opening operation again.

さて、今、電動弁５が上述のように開動作中九過トルク
状態釦なって閉動作と開動作とを反復している最中に閉
動作が不可能になってｒＨＪレベルの過トルク信号２５
ａがタイマ２９における設定時間・Ｔ５に到達したとす
ると、該タイマの出力信号２９ａがｒＨＪになるので判
定信号３２ａがｒＬＪになる。したがって、この場合、
入力部３５に開指令信号２１ａが入力されてい℃も該入
力部からは正転指令信号３８ａも逆転指→信＠３９ａも
出力されないので、電動弁５は停止状態になり℃、該弁
に生じていた過トルク状態が解消され。Now, as mentioned above, during the opening operation of the electric valve 5, the nine overtorque state button is activated, and while repeating the closing and opening operations, the closing operation becomes impossible and an overtorque signal of rHJ level is generated. 25
When a reaches the set time T5 in the timer 29, the output signal 29a of the timer becomes rHJ, so the determination signal 32a becomes rLJ. Therefore, in this case,
Since the open command signal 21a is input to the input section 35 and neither the forward rotation command signal 38a nor the reverse rotation command signal 39a is output from the input section even at ℃, the motor-operated valve 5 is in a stopped state. The overtorque condition that had been occurring has been resolved.

弁５の損傷が防止される。Damage to the valve 5 is prevented.

上述した所はタイマ２９が時限到達状態になった場合で
あるが、今、弁５が開動作中に過トルク状態になつ℃閉
動作と開動作とを繰り返し℃いる時、過トルク信号２５
ａがｒＨＪになることにより℃カウンタ２８がカウント
アツプ動作をして出力信号２８ａがｒＨＪになったとす
ると、この場合も判定信号、３２ａがｒＬＪになるので
、を動弁５は開動作を開始しないで直ちに停止状態にな
る。The above-mentioned case is when the timer 29 reaches the time limit, but now when the valve 5 is in an overtorque state during the opening operation and repeating the closing and opening operations, the overtorque signal 25
When a becomes rHJ, the °C counter 28 performs a count-up operation and the output signal 28a becomes rHJ. In this case as well, the judgment signal 32a becomes rLJ, so the valve train 5 does not start the opening operation. It will stop immediately.

故に、この時弁５が停止状態にならないで以後開閉動作
を反復することによって生じる恐れのある該電動弁の損
傷が防止されることになる。第１図におけるリセットス
イッチ２７は、上記のようにしてカウントアツプ状態に
なったカウンタ２８をリセットしてその出力信号２８ａ
をｒＬＪに復帰させるために設けられ℃いる。Therefore, damage to the motor-operated valve that may occur due to repeated opening and closing operations of the valve 5 without being stopped at this time is prevented. The reset switch 27 in FIG. 1 resets the counter 28 which has entered the count-up state as described above and outputs the output signal 28a.
It is provided to restore the rLJ to rLJ.

以上の説明は、電動弁５が開動作中に過トルク状ｐｃな
った場合に実行される電動弁駆動装置４５の動咋忙関わ
るものであったが、′ｗ１動弁５が閉動作中に過トルク
状態になった場合にも駆動装Ｒ４５が上述と同様な動作
を行うことヲエ自ら明らかである。The above explanation was related to the operation of the electric valve drive device 45, which is executed when the electric valve 5 is in an overtorque state during the opening operation, but when the electric valve 5 is in the closing operation, It is obvious that the drive unit R45 operates in the same manner as described above even in the event of an overtorque condition.

なお、上述した所から明らかなよう九、駆動装置４５に
おい℃は、過トルク判定信号３２ａが「Ｈ」になるとア
ンド回路３６．３７が開指令信号２１ａ、閉指令信号２
１ｂに応じた信号を出力しうる状態になると共にアンド
回路３３．３４がいずれも出力禁止状態になるので、信
号３２ａが「Ｈ」になる時刻ｔｏ以前に開動作をしてい
た電動弁５が１時刻ｔＱで閉動作をすることを許可され
た状態になり、また時刻ｔｏ以前＃Ｃｔ動弁５が閉動作
をしていた場合、時刻ｔＱで電動弁５が開動作を始める
ことを許可された状態になる。そうして１判、定信号３
２ａがｒＬＪ　Ｋなると、上述した電動弁５の逆方向に
復帰する動作は禁止された状態になるので、「Ｈ」レベ
ルの判定信号３２ａを弁復帰動作許可信号と呼び、「Ｌ
」レベルの信号３２ａを弁復帰動作禁止信号と呼ぶこと
ができる。As is clear from the above, when the overtorque determination signal 32a becomes "H", the AND circuits 36 and 37 output the open command signal 21a and the close command signal 2.
Since the AND circuits 33 and 34 are both in a state where they can output a signal according to signal 1b, and the output is prohibited, the motor-operated valve 5, which was in the opening operation before the time to when the signal 32a becomes "H", is If the #Ct valve train 5 is allowed to close at time tQ, and the #Ct valve train 5 was in the closing action before time tQ, the motor-operated valve 5 is allowed to start the opening action at time tQ. state. Then 1 judgment, constant signal 3
2a reaches rLJ K, the above-mentioned return operation of the electric valve 5 in the opposite direction is prohibited, so the determination signal 32a at the "H" level is called the valve return operation permission signal, and the "L" level judgment signal 32a is called the valve return operation permission signal.
” level signal 32a can be called a valve return operation prohibition signal.

また、Ｍ１図における判定信号３２ａは、カウンタ２８
とタイマ２９とオアゲート３０とアンドゲート３１と電
動弁５とが上述のように動作して出力される信号である
から、弁５に発生した過トルク状態が重度であるか軽度
であるかまたは前記過トルク状態が弁５の動作の一方向
だけに関わるものか両方向に関わるものかなどの、弁５
における過トルクの発生状態に応じた信号である。故に
、過トルク発生状態判定部３２は、過トルク信号２５ａ
が入力され″ＣＣ倍信号２５Ｈ入力態様に応じた所定の
信号処理を行ってその結果に対応した判定信号３２ａを
出力するものであるということができる。Further, the determination signal 32a in the M1 diagram is the counter 28
The signals are output when the timer 29, OR gate 30, AND gate 31, and electric valve 5 operate as described above. valve 5, such as whether the overtorque condition involves only one direction of valve 5 operation or both directions;
This signal corresponds to the state of occurrence of overtorque. Therefore, the overtorque occurrence state determining section 32 detects the overtorque signal 25a.
It can be said that the CC multiplied signal 25H is inputted, performs predetermined signal processing according to the input mode of the CC multiplied signal 25H, and outputs the determination signal 32a corresponding to the result.

第１図に示した運転許可信号２４は複数個設けられた電
動弁駆動装置４５のうちの一台を選択するために設けら
れており、またアンドゲート２６は上述の動作を行わせ
るために設けられているので、駆動装＠４５が一台だけ
でかつカウンタ２８がリセット手段を内蔵したものであ
れば、上述した信号２４．ゲート２６及びスイッチ２７
は適宜省略されて差し支えないものである。なお、この
場合にアンド回路４０．４１をそれぞれ二入力アンド回
路にする必要があることは当然である。The operation permission signal 24 shown in FIG. 1 is provided to select one of the plurality of electric valve drive devices 45, and the AND gate 26 is provided to perform the above-mentioned operation. Therefore, if there is only one driving device @45 and the counter 28 has a built-in reset means, the above-mentioned signal 24. Gate 26 and switch 27
may be omitted as appropriate. Note that in this case, it is natural that the AND circuits 40 and 41 need to be two-input AND circuits.

第１図及び８２図に示した電動弁駆動装置４５は上述の
ように動作するので、この装置４５によれば、！動弁５
に過トルク状態が発生した場合。Since the electric valve driving device 45 shown in FIGS. 1 and 82 operates as described above, according to this device 45,! Valve train 5
If an overtorque condition occurs.

弁５に逆方同和動作する復帰動作をさせるかまたは該電
動弁を停止状急にさせることが自動的に行われるので、
弁５の過トルク状態が迅速に解消され℃該過トルク状態
の弁５や該弁が設置されているプラントに及ぼす影響が
低減されろことになる。Since it is automatically performed to cause the valve 5 to perform a return operation that performs a reverse doubling operation, or to cause the electric valve to suddenly stop,
The overtorque state of the valve 5 is quickly resolved, and the influence of the overtorque state on the valve 5 and the plant in which the valve is installed is reduced.

〔発明の効果〕〔Effect of the invention〕

上述したように、本発明におい′Ｃは、電動弁が全開状
態にあるか否かに応じた第１信号と電動弁が開方向の過
トルク状態にあるか否かに応じた第２信号、と電動弁が
全閉状態にあるか否かに応じた第３信号と電動弁が閉方
向の過トルク状態忙あるか否かに応じた第４信号とを出
力する電動弁動作状態検出部と；前記第１乃至第４信号
が入力され電動弁が全開及び全閉のいずれの状態忙もな
くてかつ電動弁が開方向または閉方向のいずれかの過ト
ルク状態になると過トルク信号を出力する過トルク状聾
検出部と；過トルク信号が入力され該過トルク信号の入
力態様に応じた所定の信号判定処理を行ってその結果に
対応した過トルク判定信号を出力する過トルク発生状態
判定部と；前記第１及び２ｇ２信号と過トルク判定信号
と開指＋ｍ号とが入力されｌ！電動弁全開状態になくか
つ電動弁が開方向の過トルク状態になくかつ過トルク判
定偏号が電動弁の復帰動作を禁止する弁復帰動作禁止信
号である場合に開指令信号に応じた第１中継偏号を出力
する４入力の第１アンド回路と、前記第３及び第４信号
と過トルク判定信号と閉指７８１（！！号とが入力され
電動弁が全閉４態になくかつ電動弁が閉方向の過トルク
状態にな（かつ過トルク判定信号が弁復帰動作禁止信号
である場合に閉指令信号に応じた第２中継信号を出力す
る４入力の第２アンド回路とが設げられ、過トルク判定
信号が弁復帰動作禁止信号である場合には第１中継信号
に応じた信号を正転指令信号として出力すると共に第２
中継信号に応じた信号な逆転指令信号として出力し、過
トルク判定信号が電動、弁の復帰動作を許可する弁復帰
動作許可信号である場合には閉指令信号に応じた信号を
逆転指令信号として出力すると共に閉指令信号に応じた
信号な正転指令信号とし′こ出力する入力部と；正転指
令信号が入力されると該正転指令信号が入力され℃いる
正転指令期間中正転駆動信号を出力し続けると共に正転
指令期間中に逆転指令信号が入力されても逆転駆動信号
を出力しないようにし、逆転指令信号が入力されると該
逆転指令信号が入力され℃いる逆転指令期間中逆転駆動
信号を出力し続けると共に逆転指令期間中に正転指令信
号が入力されても正転駆動信号を出力しないようにする
出力部と；正転駆動信号が入力されると電動弁の電動機
棲を正転させて電・動弁に開動作をさせ逆転駆動信号が
入力されると電動機を逆転させて電動弁に閉動作をさせ
る電動機駆動部と；閉指令信号及び閉指令信号を出力信
号として出力する制御部とを備え、制御部の前記出力信
号にもとづきｔＶ！ｉＪ機駆動部機上動部電動弁を駆動
するものであって、過トルク発生状態判定部が行う前記
信号判定処ｆＭｔゴ、過トルク発生状態判定部に過トル
ク信号が入力されない時は過トルク判定信号として弁復
帰動作禁止信号を出力させ、過トルク発生状態判定部に
過トルク信号が入力された時該過トルク信号のこの入力
動作回数が所定回数未満であれば直ちに弁復帰動作許可
偏号を過トルク判定信号として出力させ、過トルク発生
状態判定部が弁復帰動作許可信号を出力している巖中に
、過トルク信号が所定時間未満の継続時間で消滅するか
または過トルク信号の継続時間が前記所定時間に到達す
るかすると弁復帰動作禁止信号を過トルク判定信号とし
て出力させ％遇トルク発生状態判定部に過トルク信号が
入力された時該過トルク信号のこの入力動作回数が前記
所定回数に一致していると過トルク信号の入力動作にか
かわらず過トルク判定信号として弁復帰動作禁止信号を
出力させ続ける信号処理動作であるようにして電動弁駆
動装置を構成した。As described above, 'C' in the present invention includes a first signal depending on whether the electric valve is in a fully open state and a second signal depending on whether the electric valve is in an overtorque state in the opening direction. an electric valve operation state detection unit that outputs a third signal depending on whether the electric valve is in a fully closed state, and a fourth signal depending on whether the electric valve is in an overtorque state in the closing direction; ;When the first to fourth signals are input and the motor-operated valve is not busy in either fully open or fully closed state, and the motor-operated valve is in an overtorque state in either the open direction or the close direction, an overtorque signal is output. an overtorque state deafness detection section; an overtorque occurrence state determination section that receives an overtorque signal, performs a predetermined signal determination process according to the input mode of the overtorque signal, and outputs an overtorque determination signal corresponding to the result; The first and second g2 signals, the overtorque determination signal, and the open finger +m number are input! If the motorized valve is not in a fully open state, the motorized valve is not in an overtorque state in the opening direction, and the overtorque judgment sign is a valve return operation prohibition signal that prohibits the return operation of the motorized valve, the first A 4-input first AND circuit that outputs a relay deviation signal, the third and fourth signals, an overtorque judgment signal, and a closing finger 781 (!!) are input to indicate that the electric valve is not in the fully closed 4 state and that the A second AND circuit with four inputs is provided which outputs a second relay signal in accordance with the closing command signal when the valve is in an overtorque state in the closing direction (and the overtorque determination signal is a valve return operation prohibition signal). If the overtorque determination signal is a valve return operation prohibition signal, a signal corresponding to the first relay signal is output as a forward rotation command signal, and a second relay signal is output.
A signal corresponding to the relay signal is output as a reverse command signal, and if the overtorque judgment signal is a valve return operation permission signal that permits electric valve return operation, a signal corresponding to the close command signal is output as a reverse command signal. An input section that outputs a forward rotation command signal corresponding to the close command signal; when a forward rotation command signal is input, the forward rotation command signal is input and the normal rotation drive is performed during the normal rotation command period. It continues to output the signal and does not output the reverse drive signal even if a reverse command signal is input during the forward rotation command period, and when the reverse command signal is input, the reverse command signal is input during the reverse rotation command period. an output section that continues to output a reverse rotation drive signal and does not output a forward rotation drive signal even if a forward rotation command signal is input during a reverse rotation command period; a motor drive unit that rotates the motor in the forward direction to cause the electric valve to open, and when a reverse drive signal is input, rotates the motor in the reverse direction to cause the electric valve to close; and a control section that outputs tV! based on the output signal of the control section. The iJ machine drive unit drives the on-machine moving part electric valve, and the signal determination process fMt is performed by the overtorque generation state determination unit.When no overtorque signal is input to the overtorque generation state determination unit, overtorque A valve return operation prohibition signal is output as a judgment signal, and when the overtorque signal is input to the overtorque occurrence state determination section, if the number of input operations of the overtorque signal is less than a predetermined number of times, the valve return operation permission signal is immediately output. is output as an overtorque determination signal, and while the overtorque occurrence state determination section is outputting the valve return operation permission signal, the overtorque signal disappears for a duration less than a predetermined time or the overtorque signal continues. When the time reaches the predetermined time, a valve return operation prohibition signal is output as an overtorque determination signal, and when the overtorque signal is input to the percentage torque generation state determination section, the number of input operations of the overtorque signal is The electric valve drive device is configured such that the signal processing operation continues to output the valve return operation prohibition signal as the overtorque determination signal regardless of the input operation of the overtorque signal when the number of times matches the predetermined number of times.

このため、上記のように構成すると、電動弁が過トルク
状態になって過トルク状態検出部から過トルク信号が出
力された場合、この過トルク信号の発生回数が過トルク
発生状態判定部において設定された所だ回数ＮＳに達し
℃いないと直ちに電動弁が過トルク信号発生時の動作方
向とは逆の方向に駆動されて過トルク状態の解消が図ら
れ、この過トルク状態解消劾作によつ℃上記の過トルク
信号が消滅すると再び電動弁は過トルク信号発生時の動
作方向と同じ方向に駆動される。そうして、電動弁が再
び過トルク状態になると再び電動弁が逆の方向に駆動さ
れる。そうし″Ｃ％電動弁がこのような往復動作を繰り
返すうち、過トルク偏号の生じている時間が過トルク発
生状態判定部において設定された所定時間Ｔｓに到達す
るかまたは過トルク信号の発生回数が前記回数ＮＳに到
達するかする。と、電動機駆動部に正転駆動信号も逆転
駆動信号も入力されなくなって電動弁が停止状態になる
。故に、本発明の電動弁駆動装置によれば。Therefore, with the above configuration, when the electric valve is in an overtorque state and an overtorque signal is output from the overtorque state detection section, the number of occurrences of this overtorque signal is set in the overtorque occurrence state determination section. As soon as the number of times NS has been reached and the electric valve has not reached NS, the electric valve is driven in the opposite direction to the operating direction when the overtorque signal was generated to eliminate the overtorque condition. When the above-mentioned overtorque signal disappears, the electric valve is driven again in the same direction as the operating direction when the overtorque signal was generated. Then, when the motor-operated valve again enters the overtorque state, the motor-operated valve is driven in the opposite direction again. Then, while the electric valve repeats such a reciprocating operation, the time during which overtorque deviation occurs reaches a predetermined time Ts set in the overtorque occurrence state determination section, or an overtorque signal occurs. When the number of times reaches the number NS, neither the forward rotation drive signal nor the reverse rotation drive signal is inputted to the motor drive unit, and the electric valve becomes stopped.Therefore, according to the electric valve drive device of the present invention, .

過トルク状態が発生した時、自動的に電動弁が逆方向に
駆動され、この逆方向駆動が所定回数式られるかまたは
逆方向駆動による電動弁の逆方向動作が不可能であると
自動的に電動弁が停止状態にされるので１本発明には、
電動弁に過トルク状態が発生した場合該状慾が迅速に解
消されて、前記過トルク状態の電動弁や該弁が設置され
ているプラントに及ぼす悪影響が低減される効果がある
。When an overtorque condition occurs, the electric valve will be automatically driven in the reverse direction, and if this reverse drive is activated a predetermined number of times or the reverse operation of the electric valve by the reverse drive is impossible, the electric valve will automatically be driven in the reverse direction. Since the electric valve is brought into a stopped state, the present invention has the following features:
When an overtorque state occurs in the electric valve, the situation is quickly resolved, and the adverse effect on the overtorque electric valve and the plant in which the valve is installed is reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例の構成図、第２図は第１図に
おける要部の配置及び接続状態説明図、第３図は従来の
電動弁駆動装置の構成説明図である。 １ｂ・・・・・・電動機、５・・・・・・電動弁、７．
４４・・・・・・出力部、７ａ・・・・・・正転駆動信
号、　　７ｂ・・・・・・逆転駆動信号、８・・・・・
・電動機駆動部、９ａ＃３８ａ・・・・・・正転指令信
号、　　９ｂｓ３９ａ・・・・・・逆転指令信号、１７
・・・・・・電動弁動作状態検出部、１８ａ・・・・・
・第１信号、１８ｂ・・・・・・第２信号。 ｔａＣ・・・・・・第３信号％　１８ｄ・・・・・・第
４信号、２１ａ・・・・・・開指令９号、２１ｂ・・・
・・・閉指÷信号、２２・・・・・・制御部。 ２５・・・・・・過トルク状血検出部％　２５ト・・・
・・過トルク信号、３２・・・・・・過トルク発生状態
判定部、３２ａ・・・・・・過トルク判定信号、３３・
・・・・・第１アンド回路、３３ａ・・・・・・第１中
継信号、３４・・・・・・第２アンド回路、３４ａ・・
・・・・第２中継信！、　　３５・・・・・・入力部、
４４・・・・・・出力部。FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the arrangement and connection state of essential parts in FIG. 1, and FIG. 3 is a configuration explanatory diagram of a conventional electric valve drive device. 1b...Electric motor, 5...Electric valve, 7.
44... Output section, 7a... Forward rotation drive signal, 7b... Reverse rotation drive signal, 8...
・Electric motor drive unit, 9a#38a...Forward rotation command signal, 9bs39a...Reverse rotation command signal, 17
......Electric valve operating state detection section, 18a...
-First signal, 18b...Second signal. taC...3rd signal % 18d...4th signal, 21a...Open command No. 9, 21b...
. . . Closed finger ÷ signal, 22 . . . Control section. 25...Overtorque blood detection part% 25...
...Overtorque signal, 32...Overtorque occurrence state determination section, 32a...Overtorque determination signal, 33.
...First AND circuit, 33a...First relay signal, 34...Second AND circuit, 34a...
...Second relay message! , 35...input section,
44...Output section.

Claims (1)

【特許請求の範囲】[Claims] 電動弁が全開状態にあるか否かに応じた第１信号と前記
電動弁が開方向の過トルク状態にあるか否かに応じた第
２信号と前記電動弁が全閉状態にあるか否かに応じた第
３信号と前記電動弁が閉方向の過トルク状態にあるか否
かに応じた第４信号とを出力する電動弁動作状態検出部
と；前記第１乃至第４信号が入力され前記電動弁が全開
及び全閉のいずれの状態にもなくてかつ前記電動弁が前
記開方向または前記閉方向のいずれかの過トルク状態に
なると過トルク信号を出力する過トルク状態検出部と；
前記過トルク信号が入力され該過トルク信号の入力態様
に応じた所定の信号判定処理を行ってその結果に対応し
た過トルク判定信号を出力する過トルク発生状態判定部
と；前記第１及び第２信号と前記過トルク判定信号と開
指令信号とが入力され前記電動弁が全開状態になくかつ
前記電動弁が前記開方向の過トルク状態になくかつ前記
過トルク判定信号が前記電動弁の復帰動作を禁止する弁
復帰動作禁止信号である場合に前記開指令信号に応じた
第１中継信号を出力する４入力の第１アンド回路と、前
記第３及び第４信号と前記過トルク判定信号と閉指令信
号とが入力され前記電動弁が全閉状態になくかつ前記電
動弁が前記閉方向の過トルク状態になくかつ前記過トル
ク判定信号が前記弁復帰動作禁止信号である場合に前記
閉指令信号に応じた第２中継信号を出力する４入力の第
２アンド回路とが設けられ、前記過トルク判定信号が前
記弁復帰動作禁止信号である場合には前記第１中継信号
に応じた信号を正転指令信号として出力すると共に前記
第２中継信号に応じた信号を逆転指令信号として出力し
、前記過トルク判定信号が前記電動弁の復帰動作を許可
する弁復帰動作許可信号である場合には前記開指令信号
に応じた信号を前記逆転指令信号として出力すると共に
前記閉指令信号に応じた信号を前記正転指令信号として
出力する入力部と；前記正転指令信号が入力されると該
正転指令信号が入力されている正転指令期間中正転駆動
信号を出力し続けると共に前記正転指令期間中に前記逆
転指令信号が入力されても逆転駆動信号を出力しないよ
うにし、前記逆転指令信号が入力されると該逆転指令信
号が入力されている逆転指令期間中前記逆転駆動信号を
出力し続けると共に前記逆転指令期間中に前記正転指令
信号が入力されても前記正転駆動信号を出力しないよう
にする出力部と；前記正転駆動信号が入力されると前記
電動弁の電動機を正転させて前記電動弁に開動作をさせ
前記逆転駆動信号が入力されると前記電動機を逆転させ
て前記電動弁に閉動作をさせる電動機駆動部と；前記開
指令信号及び前記閉指令信号を出力信号として出力する
制御部とを備え、前記制御部の前記出力信号にもとづき
前記電動機駆動部によって前記電動弁を駆動するもので
あって、前記過トルク発生状態判定部が行う前記信号判
定処理は、前記過トルク発生状態判定部に前記過トルク
信号が入力されない時は前記過トルク判定信号として前
記弁復帰動作禁止信号を出力させ、前記過トルク発生状
態判定部に前記過トルク信号が入力された時該過トルク
信号のこの入力動作回数が所定回数未満であれば直ちに
前記弁復帰動作許可信号を前記過トルク判定信号として
出力させ、前記過トルク発生状態判定部が前記弁復帰動
作許可信号を出力している最中に前記過トルク信号が所
定時間未満の継続時間で消滅するかまたは前記過トルク
信号の継続時間が前記所定時間に到達するかすると前記
弁復帰動作禁止信号を前記過トルク判定信号として出力
させ、前記過トルク発生状態判定部に前記過トルク信号
が入力された時該過トルク信号のこの入力動作回数が前
記所定回数に一致していると前記過トルク信号の入力動
作にかかわらず前記過トルク判定信号として前記弁復帰
動作禁止信号を出力させ続ける信号処理動作であること
を特徴とする電動弁駆動装置。A first signal depending on whether the motorized valve is in a fully open state, a second signal depending on whether the motorized valve is in an overtorque state in the opening direction, and a second signal depending on whether the motorized valve is in a fully closed state. an electric valve operation state detection unit that outputs a third signal depending on whether the electric valve is in an overtorque state in the closing direction and a fourth signal depending on whether the electric valve is in an overtorque state in the closing direction; an overtorque state detection unit that outputs an overtorque signal when the motorized valve is not in either a fully open or fully closed state and the motorized valve is in an overtorque state in either the opening direction or the closing direction; ;
an overtorque occurrence state determination unit that receives the overtorque signal, performs a predetermined signal determination process according to the input mode of the overtorque signal, and outputs an overtorque determination signal corresponding to the result; 2 signal, the overtorque determination signal, and the open command signal are input, the motorized valve is not in a fully open state, the motorized valve is not in an overtorque state in the opening direction, and the overtorque judgment signal indicates that the motorized valve is restored. a 4-input first AND circuit that outputs a first relay signal according to the open command signal when the valve return operation prohibition signal prohibits operation; and the third and fourth signals and the overtorque determination signal. When a close command signal is input, the electric valve is not in a fully closed state, the electric valve is not in an overtorque state in the closing direction, and the overtorque determination signal is the valve return operation prohibition signal, the close command is issued. a 4-input second AND circuit that outputs a second relay signal according to the signal, and outputs a signal according to the first relay signal when the overtorque determination signal is the valve return operation prohibition signal; A signal corresponding to the second relay signal is output as a forward rotation command signal, and a signal corresponding to the second relay signal is output as a reverse rotation command signal, and when the overtorque determination signal is a valve return operation permission signal that permits the return operation of the electric valve. an input section that outputs a signal corresponding to the open command signal as the reverse rotation command signal and outputs a signal corresponding to the close command signal as the forward rotation command signal; The forward rotation drive signal continues to be output during the forward rotation command period during which the rotation command signal is input, and the reverse rotation drive signal is not output even if the reverse rotation command signal is input during the forward rotation command period, and the reverse rotation command signal When input, the reverse rotation drive signal continues to be output during the reverse rotation command period during which the reverse rotation command signal is input, and the forward rotation drive signal is output even if the forward rotation command signal is input during the reverse rotation command period. an output unit configured to rotate the motor of the motor-operated valve in the normal direction to cause the motor-operated valve to open when the normal rotation drive signal is input, and to reverse the motor when the reverse rotation drive signal is input; a motor drive section that causes the electric valve to close; a control section that outputs the open command signal and the close command signal as output signals; The signal determination processing performed by the overtorque occurrence state determination section is for driving an electric valve, and when the overtorque signal is not input to the overtorque occurrence state determination section, the overtorque determination signal is used to detect the valve. A return operation prohibition signal is output, and when the overtorque signal is input to the overtorque occurrence state determination section, if the number of input operations of the overtorque signal is less than a predetermined number of times, the valve return operation permission signal is immediately output. The overtorque signal is output as an overtorque determination signal, and the overtorque signal disappears for a duration less than a predetermined time while the overtorque occurrence state determination section is outputting the valve return operation permission signal, or the overtorque signal is output as an overtorque determination signal. When the duration reaches the predetermined time, the valve return operation prohibition signal is output as the overtorque determination signal, and when the overtorque signal is input to the overtorque generation state determination section, the overtorque signal is output. If the number of input operations matches the predetermined number of times, the signal processing operation continues to output the valve return operation prohibition signal as the overtorque determination signal regardless of the input operation of the overtorque signal. Electric valve drive device.