JPS63142401A - Gate control system - Google Patents
Gate control systemInfo
- Publication number
- JPS63142401A JPS63142401A JP28938586A JP28938586A JPS63142401A JP S63142401 A JPS63142401 A JP S63142401A JP 28938586 A JP28938586 A JP 28938586A JP 28938586 A JP28938586 A JP 28938586A JP S63142401 A JPS63142401 A JP S63142401A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- command
- control
- opening
- control command
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000005856 abnormality Effects 0.000 abstract description 19
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000012795 verification Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000004092 self-diagnosis Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Safety Devices In Control Systems (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ダムあるいは堰などにおけるゲートあるいは
開閉弁などの開閉機構を遠隔制御する際のゲート制御方
式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gate control method for remotely controlling an opening/closing mechanism such as a gate or an on-off valve in a dam or weir.
従来、ダムや堰などのゲートを遠隔制御する場合、管理
所側にゲート遠隔制御装置を設けると共に、ゲート側に
該ゲートを開閉駆動する駆動機構を設け、さらにこれら
を一対の伝送装置を介して接続し、水位やゲート開度の
現在値を検知しながらゲート操作指令を遠隔制御装置側
から送信し、実際の水位が目標水位になるようにゲート
の開度を制御するようにしている。Conventionally, when controlling gates of dams, weirs, etc. remotely, a gate remote control device is provided at the management center, a drive mechanism is provided at the gate to open and close the gate, and these are connected via a pair of transmission devices. The remote controller transmits gate operation commands while detecting the current water level and gate opening, and controls the gate opening so that the actual water level matches the target water level.
このようなシステムにおいて、ゲート遠隔制御装置ある
いは伝送装置に動作異常が発生すると、ゲート操作指令
が出力されたままになって誤放流が生じてしまい、好ま
しくない。In such a system, if an abnormality occurs in the gate remote control device or the transmission device, the gate operation command will continue to be output, resulting in erroneous discharge, which is undesirable.
そこで、ゲート遠隔制御装置にはその主要回路部に自己
診断機能を付加したり、また伝送装置の主要回路部分に
も「日本電機工業会標準規格１３３７（１９７４年制定
）」に記載されているように「２重選択防止」、「渋滞
１回線断表示と子局ロック」。Therefore, we added a self-diagnosis function to the main circuit of the gate remote control device, and also added a self-diagnosis function to the main circuit of the transmission device according to the "Japan Electrical Manufacturers Association Standard 1337 (established in 1974)". "Double selection prevention", "Congestion single line disconnection display and slave station lock".
「符号検定方式」、「誤り検定方式」等の伝送異常検定
機能を付加し、上記のような誤放流に対する対策を講じ
たものがある。Some systems have added transmission abnormality testing functions such as "sign verification method" and "error verification method" to take measures against the above-mentioned erroneous discharges.
また、特開昭５５−２１６５５号に示されているように
１周期的な制御信号が一定時間以上中断した場合には繰
作指令を解除して誤制御を最小限に抑えるようにしたも
のもある。Furthermore, as shown in Japanese Patent Application Laid-open No. 55-21655, there is also a system that cancels the operation command when one periodic control signal is interrupted for a certain period of time or more to minimize erroneous control. be.
ところが、自己診断機能あるいは伝送異常検定機能が診
断または検定の対策としているものは主要回路部分のみ
であり、数が多い各種信号の入出力回路の素子の異常ま
たは入出力信号自体の異常については診断機能が複雑化
する関係上、診断または検定対象外としている。このた
め、入出力回路の素子異常または入出力信号自体の異常
に対してはこれを検知し得ず、結果的に誤放流を防止で
きないという問題があった。また、特開昭５５−２１６
５５号によるものでは、操作指令が一度は出力されてし
まうため、誤放流を完全に防止できないという問題があ
る。However, the self-diagnosis function or transmission abnormality verification function diagnoses or verifies only the main circuit parts, and cannot diagnose abnormalities in the elements of the input/output circuits of a large number of various signals or abnormalities in the input/output signals themselves. Due to the complexity of its functions, it is not subject to diagnosis or testing. For this reason, there is a problem in that it is not possible to detect an abnormality in the elements of the input/output circuit or in the input/output signal itself, and as a result, it is impossible to prevent erroneous discharge. Also, JP-A-55-216
The method according to No. 55 has the problem that erroneous discharge cannot be completely prevented because the operation command is output once.
本発明の目的は、誤放流を完全に防止することができる
ゲート制御方式を提供することにある。An object of the present invention is to provide a gate control method that can completely prevent erroneous discharge.
本発明は、ゲートなどの開閉機構の操作指令および操作
指令中であることを示す所定周期の制御指令を送信側か
ら受信側に伝送装置を介して伝送し、受信側で両指令の
確立時のみ開閉機構の操作指令を出力して開閉機構を制
御するように構成したものである。The present invention transmits an operation command for an opening/closing mechanism such as a gate and a control command at a predetermined period indicating that the operation command is in progress from a transmitting side to a receiving side via a transmission device, and only when both commands are established on the receiving side. It is configured to control the opening/closing mechanism by outputting an operation command for the opening/closing mechanism.
開閉機構は送信側から受信した操作指令と所定周期の制
御指令が両方とも正常である時のみ操作される。従って
、制御指令の異常時または繰作指令の異常時には開閉機
構は全く操作されない、また、開閉機構の入力に最も近
い回路部位で制御指令の異常の有無を検定するため、送
信側および受信側の入出力回路素子に異常が発生した場
合にも各入出力回路に診断機能を付加することなく誤っ
た操作指令が出力されてしまうのを防止し、その結果と
して誤放流を完全に防止することができる。The opening/closing mechanism is operated only when both the operation command received from the transmitting side and the control command of a predetermined period are normal. Therefore, when the control command is abnormal or the operation command is abnormal, the opening/closing mechanism is not operated at all.In addition, since the presence or absence of an abnormality in the control command is verified at the circuit part closest to the input of the opening/closing mechanism, the transmitting and receiving side Even if an abnormality occurs in an input/output circuit element, it is possible to prevent incorrect operation commands from being output without adding a diagnostic function to each input/output circuit, and as a result, it is possible to completely prevent erroneous discharge. can.
第１図は本発明を適用したゲート遠隔制御システムの一
実施例を示すブロック図であり、１はゲート遠隔制御装
置、２はプロセス入出力装置、３はゲート制御演算処理
部、４は定周期反転制御指令作成部、５は制御信号出力
部、６はゲート操作指令、７は制御指令、８は伝送装置
であり、制御装置１および伝送装置Ｅ８は管理所に設置
される。FIG. 1 is a block diagram showing an embodiment of a gate remote control system to which the present invention is applied, in which 1 is a gate remote control device, 2 is a process input/output device, 3 is a gate control arithmetic processing unit, and 4 is a fixed cycle Reference numeral 5 indicates a reversal control command generation unit, 5 is a control signal output unit, 6 is a gate operation command, 7 is a control command, 8 is a transmission device, and the control device 1 and the transmission device E8 are installed in a management office.
次に、９は管理所側の伝送装置８と所定の伝送路によっ
て結合された機側設置の伝送装置、１０は保護装置、１
１は制御指令反転信号受信検定部。Next, 9 is a transmission device installed on the machine side that is connected to the transmission device 8 on the management center side by a predetermined transmission path, 10 is a protection device, and 1
1 is a control command inversion signal reception verification section.
１２は制御信号検定／開閉信号出力部、１３は操作指令
、１４はゲートを開閉駆動する機側盤。12 is a control signal verification/opening/closing signal output unit, 13 is an operation command, and 14 is a machine side panel that drives the gate to open and close.
１５はゲート操作回路、１６はゲート渦動作検定回路、
１７はゲート状態表示出力回路、１８は開度計、１９は
水位計であり、ゲートＧはゲート操作回路１５によって
電磁スイッチＭｇを駆動し、その接点をオンさせること
によって回転するゲートモータＭにより開閉される。15 is a gate operation circuit, 16 is a gate vortex operation verification circuit,
17 is a gate status display output circuit, 18 is an opening gauge, and 19 is a water level gauge. The gate G is opened and closed by the gate motor M, which is rotated by driving an electromagnetic switch Mg by the gate operating circuit 15 and turning on its contact. be done.
第２図は、制御装置１．伝送装置８および９の詳細構成
を示すブロック図であり、制御装置１のゲート制御演算
処理部３および制御指令作成部４ならびに制御信号出力
部５はマイクロプロセッサとその周辺回路で構成され、
ゲート開度量の算出およびゲート操作指令、制御指令の
送出制御はマイクロプロセッサのプログラム処理によっ
て実行されるようになっている。一方、プロセス入出力
装置２は制御部２０とゲート操作指令や制御指令を出力
する複数個の出力回路２１とで構成されている。また、
管理所側の伝送装置８は操作指令等の複数の入力回路２
２と、送信制御部２３．Ｐ／Ｓ変換部２４．変調部２５
とから構成され、プロセス入出力装置２から受けた操作
指令等は入力回路２２で受信された後、送信制御部２３
の制御によってＰ／Ｓ変換部２４に選択的に入力され、
このＰ／Ｓ変換部２４で直列データに変換され、さらに
変調部２５で所定周波数の搬送波によって変調されて伝
送路３１に送出されるようになっている。また、ゲート
側の伝送装置９は復調部２６゜受信制御部２７．異常検
出部２８．Ｓ／Ｐ変換部２９、複数の出力回路３０とか
ら構成される装置た後、受信制御部２７の制御によって
Ｓ／Ｐ変換部２９に入力され、このＳ／Ｐ変換で並列デ
ータに変換され，出力回路３０を介して保護装置１０に
転送されるようになっている。なお、異常検出部２８は
管理所側の伝送装置から受けた信号に異常があれば、こ
れを検出して伝送装置異常信号を保護袋［１０に出力し
、ゲートに対する操作指令を解除させる。FIG. 2 shows the control device 1. It is a block diagram showing the detailed configuration of transmission devices 8 and 9, and the gate control calculation processing section 3, control command generation section 4, and control signal output section 5 of the control device 1 are composed of a microprocessor and its peripheral circuits,
Calculation of the gate opening amount and control of sending out gate operation commands and control commands are executed by program processing of a microprocessor. On the other hand, the process input/output device 2 includes a control section 20 and a plurality of output circuits 21 that output gate operation commands and control commands. Also,
The transmission device 8 on the management center side has multiple input circuits 2 for operation commands, etc.
2, and a transmission control section 23. P/S converter 24. Modulation section 25
After the operation commands etc. received from the process input/output device 2 are received by the input circuit 22, they are sent to the transmission control section 23.
is selectively input to the P/S converter 24 under the control of
The P/S converter 24 converts the data into serial data, and the modulator 25 modulates the signal using a carrier wave of a predetermined frequency, and sends the signal to the transmission line 31. The transmission device 9 on the gate side includes a demodulator 26, a reception controller 27, and a receiver controller 27. Abnormality detection unit 28. After the device is composed of an S/P conversion section 29 and a plurality of output circuits 30, the data is input to the S/P conversion section 29 under the control of the reception control section 27, and is converted into parallel data by this S/P conversion. The signal is transferred to the protection device 10 via the output circuit 30. Incidentally, if there is an abnormality in the signal received from the transmission device on the management center side, the abnormality detection unit 28 detects this and outputs a transmission device abnormality signal to the protective bag [10, thereby canceling the operation command for the gate.
第３図は保護装置１０の詳細構成を示すブロック図であ
り，伝送装置９からの“ゲート開”を示す操作指令によ
って作動するリレー○Ｐと、′ゲート閉″を示す操作指
令によって作動するリレーＣＬと、操作指令中であるこ
とを示す所定周期の制御指令によって作動するリレーＢ
と，このリレーＢがオン状態の時に駆動される時限ｔの
タイマＴｉ と、リレーＢがオフ状態の時に駆動される
時限ｔのタイマＴｚと、タイマＴｘ 、Ｔｚが両方とも
オフの時に作動するリレーＣとを備え，リレーＣが作動
している時のみリレーｏＰまたはＣＬのオン接点からゲ
ート操作回路１５に対してゲートの操作指令を出力し，
タイマ子工およびＴｚのうちいずれか一方がタイムアツ
プしたならばリレーＣがオフとなって操作指令を解除す
るように構成されている．なお、リレーＢ，Ｃおよびタ
イマＴｚ 、Ｔｚは制御指令反転信号受信検定部１１を
構成し、リレーＯＦ，ＣＬ，Ｃのオン接点の直並列回路
は制御信号検定／開閉信号出力部１２を構成している。FIG. 3 is a block diagram showing the detailed configuration of the protection device 10, in which a relay ○P is activated by an operation command indicating "gate open" from the transmission device 9, and a relay ○P is activated by an operation command indicating ``gate closed''. CL and relay B that operates according to a control command of a predetermined cycle indicating that an operation command is in progress.
, a timer Ti with a time period t that is driven when relay B is on, a timer Tz with a time period t that is driven when relay B is off, and a relay that is activated when both timers Tx and Tz are off. C, outputs a gate operation command to the gate operation circuit 15 from the ON contact of relay oP or CL only when relay C is operating,
The configuration is such that if either the timer slave or Tz times up, relay C is turned off and the operation command is released. Note that relays B, C and timers Tz and Tz constitute a control command inversion signal reception verification section 11, and a series-parallel circuit of on-contacts of relays OF, CL, and C constitute a control signal verification/opening/closing signal output section 12. ing.
以上の構成において，演算処理部３はゲートＧの開度を
制御するに際し、まず開度計１８と水位計１９によって
検知されているゲートＧの現在の開度と水位の信号を伝
送装置９，８、プロセス入出力装置２を介して読込むと
共に、ゲート状態表示出力回路１７で検知されているゲ
ート状態の信号を伝送装置９，８、プロセス入出力装置
２を介して読込む．そして、ゲートＧが正常の状態であ
れば，現在開度と現在水位の信号に基づいて目標水位に
対するゲートＧの操作量を算出し，この操作量に対応し
た時間幅の操作指令を制御信号出力部５に入力する。す
ると、制御信号出力部５は演算処理部３から受けた操作
指令とほぼ同一時間幅の制御指令を形成し、この制御指
令を定周期反転制御指令作成部４に入力する。作成部４
は制御信号出力部５から受けた制御指令を所定周期ｔで
オン／オフを繰返す制御指令に変換してプロセス入出力
装置２に入力する。プロセス入出力装置２は所定周期の
オン／オフ信号である制御指令７をゲートＧの操作量に
対応した時間幅の操作指令６と共に伝送装置８および９
を介して保護装置１０に伝送する。すると、保護装置１
０では所定周期ｔの制御指令７によってリレーＢがオン
／オフし、タイマＴｘ 、Ｔｚが交互に駆動されるよう
になる。In the above configuration, when controlling the opening degree of the gate G, the arithmetic processing unit 3 first sends signals of the current opening degree and water level of the gate G detected by the opening degree meter 18 and the water level meter 19 to the transmission device 9, 8. Read through the process input/output device 2, and also read the gate state signal detected by the gate status display output circuit 17 through the transmission devices 9, 8 and the process input/output device 2. If the gate G is in a normal state, the operation amount of the gate G with respect to the target water level is calculated based on the current opening degree and current water level signals, and an operation command with a time width corresponding to this operation amount is output as a control signal. Enter in section 5. Then, the control signal output section 5 forms a control command having approximately the same time width as the operation command received from the arithmetic processing section 3, and inputs this control command to the periodic reversal control command creation section 4. Creation part 4
converts the control command received from the control signal output unit 5 into a control command that repeats on/off at a predetermined period t, and inputs the control command to the process input/output device 2. The process input/output device 2 transmits a control command 7, which is an on/off signal with a predetermined cycle, together with an operation command 6 having a time width corresponding to the operation amount of the gate G to transmission devices 8 and 9.
to the protection device 10 via. Then, protection device 1
At 0, relay B is turned on/off by control command 7 at a predetermined period t, and timers Tx and Tz are driven alternately.
この時，制御指令７がｔ時間周期で正常にオン／オフし
ているならば、タイマＴｌ 、Ｔｚはタイムアツプ前に
その駆動が中断されるため，リレーＣはオン状態を継続
する．従って，リレーのオン接点をコモンとするリレー
○ＰまたはＣＬのオン接点からは，リレーＯＰまたはＣ
Ｌのオン時間に対応した時間隔のゲート操作指令１３が
出力され、ゲートＧはこのゲート操作指令１３が出力さ
れている間、開側または閉側に操作される。しかし、制
御指令７のオンまたはオフの時間が第４図のタイムチャ
ートの破線で示すようにｔ時間を越えるような異常が発
生した場合、タイマＴ１またはＴｚがタイムアツプ（第
４図の斜線部）する。このため、リレーＣがオフとなり
、ゲートＧに対する“開”または“閉′″の操作指令１
３は解除される。At this time, if the control command 7 is normally turned on and off at a period of time t, the driving of the timers Tl and Tz is interrupted before time-up, so the relay C continues to be in the on state. Therefore, from the on contact of relay ○P or CL whose on contact is common, relay OP or C
A gate operation command 13 at a time interval corresponding to the ON time of L is outputted, and the gate G is operated to the open side or the closed side while this gate operation command 13 is outputted. However, if an abnormality occurs such that the ON or OFF time of the control command 7 exceeds time t as shown by the broken line in the time chart of FIG. 4, the timer T1 or Tz times up (the shaded area in FIG. 4). do. Therefore, the relay C is turned off, and the operation command 1 for the gate G is "open" or "close'".
3 is canceled.
従って、保護装置１ｏに至るまでの制御指令７の伝送路
上に何等かの異常が発生し，制御指令７が所定周期ｔの
オン／オフを繰返さなくなった場合は、ゲートＧに対す
る操作は解除されるため、回路素子の異常を含む伝送系
の全ての異常に起因する誤放流を完全に防止することが
できる。Therefore, if some abnormality occurs on the transmission path of the control command 7 up to the protection device 1o and the control command 7 no longer repeats on/off at the predetermined period t, the operation on the gate G is canceled. Therefore, it is possible to completely prevent erroneous discharge caused by all abnormalities in the transmission system including abnormalities in circuit elements.
なお、上記実施例ではダムのゲートを開閉制御する場合
を説明したが、放水路の開閉弁などを制御する場合にも
同様に適用できるものである。In the above embodiment, a case has been described in which the opening and closing of a dam gate is controlled, but the present invention can be similarly applied to a case where an opening/closing valve of a waterway is controlled.
以上説明したように本発明によれば、ゲートの操作指令
と共に、操作指令中であることを示す所定周期の制御指
令を出力し、両指令が正常に確立している時のみゲート
の操作を実行するため、操作指令系内に何等かの異常が
発生した場合にはゲートの操作が直ちに解除されるため
、誤放流を完全に防止することができる。また、伝送装
置等の多数の入出力回路の異常診断機能を設ける必要が
ないため、システムの簡単化と信頼性の向上を図れると
いう効果がある。As explained above, according to the present invention, a control command at a predetermined period indicating that an operation command is in progress is output together with a gate operation command, and the gate operation is executed only when both commands are normally established. Therefore, if any abnormality occurs in the operation command system, the gate operation is immediately canceled, and erroneous discharge can be completely prevented. Further, since there is no need to provide an abnormality diagnosis function for a large number of input/output circuits such as a transmission device, there is an effect that the system can be simplified and reliability can be improved.
第１図は本発明を適用したゲート遠隔制御システムの一
実施例を示すブロック図、第２図はゲート遠隔制御装置
および伝送装置の詳細構成を示すブロック図、第３図は
保護装置の詳細構成を示すブロック図、第４図は実施例
の動作を説明するためのタイムチャートである。
１・・・ゲート遠隔制御装置、２・・・プロセス入出力
装置、３・・・ゲート制御演算処理部、４・・・定周期
反転制御指令作成部、６・・・ゲート操作指令、７・・
・制御指令、８，９・・・伝送装置、１０・・・保護装
置、１１・・・制御指令反転信号受信検定部、１４・・
・機側盤、１５・・・ゲート操作回路、Ｇ・・・ゲート
。FIG. 1 is a block diagram showing an embodiment of a gate remote control system to which the present invention is applied, FIG. 2 is a block diagram showing a detailed configuration of a gate remote control device and a transmission device, and FIG. 3 is a detailed configuration of a protection device. FIG. 4 is a time chart for explaining the operation of the embodiment. DESCRIPTION OF SYMBOLS 1...Gate remote control device, 2...Process input/output device, 3...Gate control arithmetic processing section, 4...Periodic reversal control command creation section, 6...Gate operation command, 7.・
- Control command, 8, 9... Transmission device, 10... Protective device, 11... Control command inversion signal reception verification section, 14...
・Machine side panel, 15...Gate operation circuit, G...Gate.
Claims (1)
するゲート制御方式において、 上記開閉機構の操作指令および操作指令中であることを
示す所定周期の制御送令を送信側から受信側に伝送装置
を介して伝送し、受信側で両指令の確立時のみ開閉機構
の操作指令を出力して開閉機構を制御することを特徴と
するゲート制御方式。 ２、所定周期の制御指令は、送信側に設けた定周期反転
制御指令作成部に対し操作指令中であることを示す制御
指令を入力し、該指令を所定周期でオン／オフを繰返す
制御指令に変換することによつて作成されるものである
特許請求の範囲第１項記載のゲート制御方式。 ３、開閉機構に対する操作指令は、受信側に設けた制御
指令反転信号受信部において送信側から受信した制御指
令が所定周期でオン／オフしているか否かを検定し、所
定周期でオン／オフしている時のみ出力されるものであ
る特許請求の範囲第１項記載のゲート制御方式。[Claims] 1. In a gate control method in which an opening/closing mechanism such as a gate is remotely controlled via a transmission device, an operation command for the opening/closing mechanism and a control transmission command at a predetermined period indicating that the operation command is in progress are transmitted. A gate control method characterized in that a signal is transmitted from one side to a receiving side via a transmission device, and the receiving side controls the opening/closing mechanism by outputting an operation command for the opening/closing mechanism only when both commands are established. 2. The predetermined cycle control command is a control command that inputs a control command indicating that an operation command is in progress to a fixed cycle reversal control command generation unit provided on the transmitting side, and repeats the on/off command at a predetermined cycle. 2. A gate control method according to claim 1, which is created by converting the gate control method into a gate control method according to claim 1. 3. The operation command for the opening/closing mechanism is determined by checking whether the control command received from the transmitting side is turned on/off at a predetermined period in a control command inversion signal receiving section provided on the receiving side, and then turned on/off at a predetermined period. 2. The gate control method according to claim 1, wherein the gate control method is outputted only when the gate control is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61289385A JPH0636629B2 (en) | 1986-12-04 | 1986-12-04 | Gate control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61289385A JPH0636629B2 (en) | 1986-12-04 | 1986-12-04 | Gate control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63142401A true JPS63142401A (en) | 1988-06-14 |
| JPH0636629B2 JPH0636629B2 (en) | 1994-05-11 |
Family
ID=17742533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61289385A Expired - Lifetime JPH0636629B2 (en) | 1986-12-04 | 1986-12-04 | Gate control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636629B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008149738A (en) * | 2006-12-14 | 2008-07-03 | Mitsubishi Agricult Mach Co Ltd | Hydraulic system of tractor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112289U (en) * | 1985-12-27 | 1987-07-17 |
-
1986
- 1986-12-04 JP JP61289385A patent/JPH0636629B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112289U (en) * | 1985-12-27 | 1987-07-17 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008149738A (en) * | 2006-12-14 | 2008-07-03 | Mitsubishi Agricult Mach Co Ltd | Hydraulic system of tractor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636629B2 (en) | 1994-05-11 |
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