JPH0243553Y2

JPH0243553Y2 -

Info

Publication number: JPH0243553Y2
Application number: JP1985185553U
Authority: JP
Priority date: 1985-12-03
Filing date: 1985-12-03
Publication date: 1990-11-20
Also published as: JPS6296954U

Description

【考案の詳細な説明】（産業上の利用分野）本考案は鋳造装置のモールドレベル制御装置に
関し、特に小形連続鋳造設備のモールド内レベル
を一定に制御するモールドレベル制御装置に関す
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold level control device for a casting machine, and more particularly to a mold level control device for controlling the level in a mold of a small continuous casting equipment to a constant level.

（従来の技術）かかる従来のモールドレベル制御装置として
は、例えば実開昭60−46950号、実開昭54−93012
号及び特開昭55−94772号公報で、連続鋳造にお
いて、モールド内湯面レベルを検知し、当該検知
信号と目標値信号との偏差信号に比例・積分演算
を施し、その演算結果に基づき、モールドへの溶
湯量を調整する技術が開示されており、さらに、
上記溶湯量の調整を、油圧シリンダに接続したス
トツパを油圧サーボ弁を介して油圧シリンダで駆
動すること、及び当該油圧シリンダの適正位置を
演算するため、ピストンロツドの位置を検出する
ことが記載されている。(Prior art) Examples of such conventional mold level control devices include Utility Model Application No. 60-46950 and Utility Model Application No. 54-93012.
No. 55-94772, in continuous casting, the level of molten metal in the mold is detected, proportional and integral calculations are performed on the deviation signal between the detection signal and the target value signal, and based on the calculation results, the mold A technique for adjusting the amount of molten metal is disclosed, and furthermore,
It is described that the amount of molten metal is adjusted by driving a stopper connected to the hydraulic cylinder with the hydraulic cylinder via a hydraulic servo valve, and that the position of the piston rod is detected in order to calculate the appropriate position of the hydraulic cylinder. There is.

（考案が解決しようとする課題）従来、モールドレベルを自動的に制御するため
に、上記実開昭60−46950号公報で開示している
ような油圧サーボ弁が使用され、かつ以下に説明
するサーボ弁の問題点、特にゴミ等に対する信頼
性が低い点を補うために油圧サーボ弁に加えて緊
急用の電磁弁を設けていた。(Problem to be solved by the invention) Conventionally, a hydraulic servo valve as disclosed in the above-mentioned Japanese Utility Model Application Publication No. 60-46950 has been used to automatically control the mold level, and as described below. In order to compensate for the problems of servo valves, especially their low reliability against dust, an emergency solenoid valve was provided in addition to the hydraulic servo valve.

しかしサーボ弁を使用したシステム構成は、弁
及び制御系も高価で複雑であり、サーボ弁がノズ
ルフラツパを使用するために、油のゴミ等のコン
タミネーシヨンに弱く、高温かつ粉塵の多い悪環
境の鋳造現場では、数ミクロンの高価なフイルタ
ーを使用するなど作動油の管理が大変であつた。
さらに、上記細いフイルターによる圧力ドロツプ
も含めて、ノズルフラツパサーボ弁は圧力損失が
多いなどの問題点もあつた。そして位置決め精度
においても、サーボ弁は入力制御電流が数十ミリ
アンペアのアナログ電流であり、工場ノイズに弱
い上に、シリンダの中間停止を保つときは、ゼロ
ラツプで０流量を実現するのでリークが多く、正
確にできないため、位置決め精度が悪く、かつ全
体として信頼性が低かつた。また、通常の電磁
弁、電磁比例・流量弁を用いて、オン・オフ制
御、フイードバツク制御を行なつても、制御流
量、位置決め精度、動作時間に支障があり適正な
制御が行なえなかつた。 However, system configurations using servo valves require expensive and complicated valves and control systems, and because servo valves use a nozzle flapper, they are susceptible to contamination such as oil dust, and can be used in harsh environments with high temperatures and dust. At casting sites, it was difficult to manage hydraulic fluid, including the use of expensive filters of several microns.
Furthermore, the nozzle flapper servo valve also had problems such as a large pressure loss, including the pressure drop caused by the thin filter mentioned above. In terms of positioning accuracy, the input control current for servo valves is an analog current of several tens of milliamps, which makes them susceptible to factory noise, and when the cylinder is kept at an intermediate stop, it achieves 0 flow rate at zero lap, so there is a lot of leakage. Since it could not be done accurately, the positioning accuracy was poor and the overall reliability was low. Further, even if on/off control and feedback control are performed using a normal solenoid valve or electromagnetic proportional/flow valve, proper control cannot be performed because of problems in control flow rate, positioning accuracy, and operating time.

本考案の目的は、かかる従来製品の欠点を解消
した低圧力で微少制御流量、高速オン・オフ制御
を可能とし、高い位置決め精度を確保できるモー
ルドレベル制御装置であつて、周囲温度、周囲雰
囲気が悪くとも、作動油の管理が十分に管理され
なくても高い位置決め精度を確保でき、かつ装置
構成が簡単で装置も安価であるようなモールドレ
ベル制御装置を提供することにある。 The purpose of the present invention is to provide a mold level control device that eliminates the drawbacks of conventional products, enables minute control flow rate at low pressure, high-speed on/off control, and ensures high positioning accuracy. At the worst, it is an object of the present invention to provide a mold level control device that can ensure high positioning accuracy even if hydraulic oil is not sufficiently managed, has a simple device configuration, and is inexpensive.

（課題を解決するための手段）このため本考案では、溶湯における小形連続鋳
造装置のモールド内湯面レベルを検知するレベル
検出器とその出力を増幅するレベル検出器アンプ
をもち、前記レベル検出器アンプのレベル信号
と、内部にもつ設定目標値との偏差信号に比例・
積分演算を施し、その演算結果を出力する調節計
を有するモールドレベル制御装置において、タン
デイシユに取り付けてあるモールドへの溶湯量を
調整するストツパに両ロツド形油圧シリンダを連
結し、前記油圧シリンダの各ロツド油室には少く
とも１個のON／OFF形高速応答タイプ電磁弁を
介して油圧源装置の圧油を送るようにし、前記油
圧シリンダに取り付けてある変位検出器およびそ
の出力を増幅する変位検出器アンプの出力と前記
調節計の出力との偏差信号により、偏差信号が０
のときはタンクに通じる側の前記電磁弁を閉止に
して前記油圧シリンダを停止させ、そして前記偏
差信号があるときは、その大きさに応じた時間タ
ンクに通じる側の前記電磁弁を連通にして前記油
圧シリンダを動かすよう制御する出力信号を出力
するコントローラを有することを特徴とするモー
ルドレベル制御装置とすることにより、上述した
従来製品の課題を解決した。(Means for Solving the Problems) Therefore, the present invention has a level detector for detecting the level of molten metal in a mold of a small continuous casting apparatus, and a level detector amplifier for amplifying its output. Proportional to the deviation signal between the level signal and the internal set target value.
In a mold level control device that has a controller that performs integral calculations and outputs the calculation results, a double rod type hydraulic cylinder is connected to a stopper attached to a tundish that adjusts the amount of molten metal into the mold, and each of the hydraulic cylinders is Pressure oil from the hydraulic power source is sent to the rod oil chamber through at least one ON/OFF type high-speed response type solenoid valve, and a displacement detector attached to the hydraulic cylinder and a displacement sensor that amplifies its output are used. The deviation signal between the output of the detector amplifier and the output of the controller causes the deviation signal to be 0.
In this case, the solenoid valve on the side leading to the tank is closed to stop the hydraulic cylinder, and when there is the deviation signal, the solenoid valve on the side leading to the tank is opened for a time corresponding to the magnitude of the deviation signal. The problems of the conventional products described above have been solved by providing a mold level control device characterized by having a controller that outputs an output signal for controlling the movement of the hydraulic cylinder.

（作用効果）上記のように本考案を構成したので、定格流量
が小さく、オン・オフ応答性が速い高速応答タイ
プの電磁弁を用い、モールドレベル制御装置を構
成することにより、十分適正な制御が可能とな
り、かつ制御構成の容易さ、作動油の管理の緩
和、装置構成価格の低減が成し得るものとなつ
た。(Function and Effect) Since the present invention is configured as described above, sufficient appropriate control can be achieved by configuring the mold level control device using a high-speed response type solenoid valve with a small rated flow rate and quick on/off response. This has made it possible to simplify the control configuration, ease management of hydraulic oil, and reduce equipment configuration costs.

即ち、本考案では、従来の通常の電磁弁、電磁
比例・流量弁とは異る、例えば3000サイクル／分
といつたオンオフ励磁切換頻度を有するような、
ON／OFF形高速応答タイポ電磁弁をサーボ弁に
代えたので、弁及び制御系も安価・簡単になり、
また弁の構造がON／OFFタイプでゴミに強く、
信頼性が高く、フイルターも50ミクロンと安価で
作動油の管理も容易で、緊急用電気回路を追加す
るだけで緊急用の電磁弁を設ける必要がなくなつ
た。またON／OFF形高速応答タイプ電磁弁はデ
ジタルなONとOFFの切替えであり、入力制御電
流は例えば1A前後と大電流のため、作動や確実
で、ノイズに強く、かつシリンダの中間位置を保
つときはタンクに通じる側の電磁弁を閉止にして
内部リークの少いスプールで閉止するので、位置
決め精度が正確になり全体として信頼性が高くな
り、その上に圧力損失がきわめて少いものとなつ
た。 That is, in the present invention, a valve having an on/off excitation switching frequency of, for example, 3000 cycles/minute, which is different from a conventional normal solenoid valve or a solenoid proportional/flow valve, is used.
By replacing the ON/OFF type high-speed response Typo solenoid valve with a servo valve, the valve and control system are also cheaper and simpler.
In addition, the valve structure is an ON/OFF type, making it resistant to dust.
It is highly reliable, has an inexpensive filter of 50 microns, and is easy to manage hydraulic fluid, eliminating the need for an emergency solenoid valve by simply adding an emergency electric circuit. In addition, the ON/OFF type high-speed response type solenoid valve has digital ON and OFF switching, and the input control current is large, for example around 1A, so it operates reliably, is resistant to noise, and maintains the intermediate position of the cylinder. In this case, the solenoid valve on the side leading to the tank is closed and the spool with minimal internal leakage is used to close the valve, resulting in accurate positioning and high overall reliability, with extremely low pressure loss. Ta.

（実施例）次に本考案の実施例につき図面を参照して説明
すると、モールドレベル制御装置はタンデイシユ
１に溶湯を受け、ストツパ２の上下操作により開
口面積を変化させることでモールド３へ吐出され
る量を制御する。制御された吐出量と鋳造片４の
引抜速度の兼合いでモールド３内のレベルが変化
し、そのレベル変化をレベル検出器８で検出し、
レベル検出器アンプ９にて増幅後、調節計１３へ
出力する。この調節計１３は、自動制御中内部に
もつ設定目標値（レベル）と入力されたレベル信
号との偏差信号に比例・積分演算を施し、演算結
果をコントローラ１２へ出力する。コントローラ
１２は調節計１３の演算出力信号と油圧シリンダ
５に取り付けてある変位検出器１０と変位検出器
アンプ１１からの現在位置信号と比較し偏差があ
れば高速応答タイプの電磁弁ブロツク６へ修正動
作信号（励磁信号）を送り油圧シリンダ５の位置
決めを行なう。以上により再びモールド３への吐
出量が修正される。このように順次修正動作が働
き常に一定レベルの湯面を保つシステムとなる。(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.The mold level control device receives molten metal in a tundish 1, and discharges it into a mold 3 by changing the opening area by vertically operating a stopper 2. control the amount of The level inside the mold 3 changes due to the controlled discharge amount and the drawing speed of the cast piece 4, and the level change is detected by the level detector 8,
After being amplified by the level detector amplifier 9, it is output to the controller 13. During automatic control, the controller 13 performs proportional and integral calculations on the deviation signal between the internally set target value (level) and the input level signal, and outputs the calculation results to the controller 12. The controller 12 compares the calculated output signal of the controller 13 with the current position signals from the displacement detector 10 and displacement detector amplifier 11 attached to the hydraulic cylinder 5, and if there is a deviation, corrects it to the high-speed response type solenoid valve block 6. The hydraulic cylinder 5 is positioned by sending an operation signal (excitation signal). Through the above steps, the discharge amount to the mold 3 is corrected again. In this way, the corrective actions work in sequence to create a system that always maintains the hot water level at a constant level.

今回、同様なシステムに用いていた電気−油圧
サーボ弁のかわりに高速応答タイプの電磁弁ブロ
ツク６を用いて、ストツパ２に連結されている油
圧シリンダ５を駆動する方法は、低圧力で制御流
量も微少まで調整可能及び高速オン・オフ制御で
有効面積の小さい油圧シリンダにおいても、電気
−油圧サーボ弁が成し難い所まで十分に位置決め
可能である。 This time, the method of driving the hydraulic cylinder 5 connected to the stopper 2 by using a fast-response type solenoid valve block 6 instead of the electro-hydraulic servo valve used in a similar system is to control the flow rate at low pressure. With minute adjustment and high-speed on/off control, even in a hydraulic cylinder with a small effective area, it is possible to sufficiently position a position that is difficult to achieve with an electro-hydraulic servo valve.

この高速応答タイプの電磁弁ブロツク６′の例
として第２図に示す様に油圧シリンダ５を停止状
態にさせる場合は、三方向切換形高速応答電磁弁
２１，２２を非励磁状態とし、操作状態にさせる
場合は、移動させたい側に励磁を行なわなければ
ならない。又、オン・オフ励磁切換頻度も3000サ
イクル／分程度まで可能であるため、外力が加わ
つている場合も常に修正動作をかけながら現位置
を保持する。 As an example of this high-speed response type solenoid valve block 6', as shown in FIG. If you want it to move, you must excite the side you want to move. Furthermore, since the on/off excitation switching frequency can be up to about 3000 cycles/minute, the current position is maintained while constantly performing correction operations even when external force is applied.

第３図に示す様に高速応答タイプの電磁弁ブロ
ツク６′を組んだ場合、ノーマルクローズ形高速
応答電磁弁２３，２６で１対、同様に２４，２５
で１対をなし油圧シリンダ５を制御する。制御方
法は第４図に示す様に油圧シリンダ５を停止状態
にさせる場合は、高速応答電磁弁２３，２４，２
５，２６の４ケ全て非励磁状態とし、操作状態に
させる場合は、前述の対の高速応答電磁弁を同じ
に励磁している時間T₁，T₂を制御することによ
り制御流量が調整できる。又、流量絞り弁２７を
回路中（この例ではＴポートであるが、Ｐポート
でも可能）に組こめばさらに効果的である。 When a high-speed response type solenoid valve block 6' is assembled as shown in FIG.
The hydraulic cylinders 5 form a pair and control the hydraulic cylinders 5. As shown in Fig. 4, the control method is to
When all four valves 5 and 26 are de-energized and activated, the control flow rate can be adjusted by controlling the times T ₁ and T ₂ during which the aforementioned pair of high-speed response solenoid valves are equally energized. . Further, it is even more effective if the flow rate restricting valve 27 is incorporated into the circuit (in this example, it is a T port, but it can also be a P port).

以上のように、連続鋳造レベル制御装置におい
て油圧駆動部に高速応答タイプの電磁弁を用い、
高速オン・オフ制御でストツパの位置決めを行う
と、周囲温度、周囲雰囲気が悪くとも、作動油の
管理が十分に管理されてなくても良く、システム
制御構成も容易となり、装置構成を安価に行なえ
る。 As mentioned above, in the continuous casting level control device, a fast response type solenoid valve is used in the hydraulic drive part,
If the stopper is positioned using high-speed on/off control, even if the ambient temperature or atmosphere is poor, there is no need to adequately manage the hydraulic fluid, the system control configuration is easy, and the equipment configuration can be done at low cost. Ru.

[Brief explanation of the drawing]

第１図はこの考案の全体構成を示すブロツク図
である。第２図および第３図は高速応答電磁弁を
使用した第１図の電磁弁ブロツクの回路例を示し
第４図は第３図の電磁弁ブロツクの作動説明図で
ある。１……タンデイシユ、２……ストツパ、３……
モールド、４……鋳造片、５……油圧シリンダ、
６……高速応答タイプの電磁弁ブロツク、７……
油圧源、８……レベル検出器、９……レベル検出
器アンプ、１０……変位検出器、１１……変位検
出器アンプ、１２……コントローラ、１３……調
節計、１４……溶湯、２１，２２……三方向切換
形高速応答電磁弁、２３，２４，２５，２６……
ノーマルクローズ形高速応答電磁弁、２７……流
量絞り弁。 FIG. 1 is a block diagram showing the overall structure of this invention. 2 and 3 show a circuit example of the solenoid valve block of FIG. 1 using a high-speed response solenoid valve, and FIG. 4 is an explanatory diagram of the operation of the solenoid valve block of FIG. 3. 1...Tandaiyu, 2...Stotsupa, 3...
mold, 4...cast piece, 5...hydraulic cylinder,
6...High-speed response type solenoid valve block, 7...
Hydraulic source, 8... Level detector, 9... Level detector amplifier, 10... Displacement detector, 11... Displacement detector amplifier, 12... Controller, 13... Controller, 14... Molten metal, 21 , 22... Three-way switching type high-speed response solenoid valve, 23, 24, 25, 26...
Normally closed type high-speed response solenoid valve, 27...flow restrictor valve.

Claims

[Scope of utility model registration request]

It has a level detector that detects the level of molten metal in the mold of a small continuous casting device, and a level detector amplifier that amplifies the output thereof, and a deviation signal between the level signal of the level detector amplifier and a set target value held inside. In a mold level control device that has a controller that performs proportional and integral calculations on and outputs the calculation results, a double rod type hydraulic cylinder is connected to a stopper attached to a tundish that adjusts the amount of molten metal into the mold, and the hydraulic cylinder is Pressure oil from the hydraulic power source is sent to each rod oil chamber of the cylinder through at least one ON/OFF type high-speed response type solenoid valve, and the displacement detector attached to the hydraulic cylinder and its output are Based on the deviation signal between the amplified output of the displacement detector amplifier and the output of the controller, when the deviation signal is 0, the solenoid valve on the side communicating with the tank is closed to stop the hydraulic cylinder, and the deviation signal is The mold level control device is characterized in that it has a controller that outputs an output signal that controls the hydraulic cylinder to be moved by communicating the solenoid valve on the side communicating with the tank for a time corresponding to the size of the mold level control device.