JPH109977A - Method and apparatus for detection of intensified differential pressure of hydraulic cylinder - Google Patents
Method and apparatus for detection of intensified differential pressure of hydraulic cylinderInfo
- Publication number
- JPH109977A JPH109977A JP16739796A JP16739796A JPH109977A JP H109977 A JPH109977 A JP H109977A JP 16739796 A JP16739796 A JP 16739796A JP 16739796 A JP16739796 A JP 16739796A JP H109977 A JPH109977 A JP H109977A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hydraulic
- spool
- hydraulic pressure
- hydraulic cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は一般的な油圧シリン
ダの油圧回路の圧力検出に関するものであるが，主とし
て，軽合金の鋳造を行うダイカストマシンやプラスチッ
クスを成形する射出成形機等の射出成形装置の型締力を
小さくするための制御回路における油圧シリンダの増圧
差圧検出方法および装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pressure detection in a hydraulic circuit of a general hydraulic cylinder, and is mainly used for injection molding such as a die casting machine for casting a light alloy and an injection molding machine for molding plastics. The present invention relates to a method and an apparatus for detecting a pressure increase pressure difference of a hydraulic cylinder in a control circuit for reducing a mold clamping force of an apparatus.
【０００２】[0002]
【従来の技術】例えば，軽合金をダイカスト法で鋳造す
る場合，従来は，通常，バリ吹きを防止するために，型
締力＞キャビティ投影面積×射出プランジャ最大圧力の
ダイカストマシンを使用しており，射出プランジャの圧
力が大きいと型締シリンダのラムは後退してバリを吹く
ので，シリンダ内の油が逃げないようにその油圧回路中
にチエック弁が設置してあった。しかし，使用中に油圧
は増圧され，装置には大きい荷重がかかるので，強度の
強い装置の設計をしていた。これを防止するために，型
締シリンダ内の油圧の増圧値を検出し，射出プランジャ
の圧力または速度を制御する方法を別途発明したが，そ
の場合も，微小な差圧を検出するための差圧検出器が必
要である。2. Description of the Related Art For example, when casting a light alloy by a die casting method, conventionally, a die casting machine of mold clamping force> cavity projected area × injection plunger maximum pressure is usually used in order to prevent burrs. If the pressure of the injection plunger is high, the ram of the mold closing cylinder retreats and blows burrs, so that a check valve is provided in the hydraulic circuit so that oil in the cylinder does not escape. However, since the hydraulic pressure was increased during use and a large load was applied to the device, a strong device was designed. In order to prevent this, a method of detecting the pressure increase value of the hydraulic pressure in the mold clamping cylinder and controlling the pressure or speed of the injection plunger has been separately invented. A differential pressure detector is required.
【０００３】[0003]
【発明が解決しようとする課題】型締シリンダ内の増圧
を検出して射出プランジャの圧力または速度を制御する
ためには，微小な差圧を早く検出する必要がある。も
し，差圧が大きく，検出が遅れると，型締シリンダが後
退したり，あるいは，過大な荷重でタイバが伸びたり，
型締装置の各部が変形して型が開き，バリを吹く。本発
明においては，油圧シリンダの増圧差圧を早く正確にか
つ容易に検出し得る方法と装置を提供することを課題と
している。In order to control the pressure or speed of the injection plunger by detecting the pressure increase in the mold clamping cylinder, it is necessary to detect a small differential pressure quickly. If the differential pressure is large and detection is delayed, the mold clamping cylinder will retract, or the tie bar will expand due to excessive load,
Each part of the mold clamping device is deformed to open the mold and blow burrs. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and a device capable of quickly and accurately detecting an increased pressure difference of a hydraulic cylinder.
【０００４】[0004]
【課題を解決するための手段】本発明においては，油圧
シリンダを用いて物体を加圧保持していて，その被加圧
物体に他の動作で発生した荷重が作用し油圧シリンダの
ピストンまたはラムを後退させる力が働くとき，その後
退を防止するためにチエック弁を油圧回路内に組込んだ
ものにおいて，両端に互いに同じ面積を持っていて摺動
可能なスプールを内蔵したケースの両側の油圧室に前記
チエック弁の前後の油圧をそれぞれ連結し，前記他の動
作によって油圧シリンダの圧力が増圧された場合にスプ
ールが変位することを利用して増圧差圧を検出するよう
にした。In the present invention, an object is pressurized and held by using a hydraulic cylinder, and a load generated by another operation acts on the object to be pressurized, and a piston or a ram of the hydraulic cylinder is operated. When a check valve is incorporated in the hydraulic circuit to prevent retraction when a force is applied to retract the hydraulic pressure, the hydraulic pressure on both sides of the case has a built-in slidable spool with the same area at both ends. The hydraulic pressures before and after the check valve are respectively connected to the chamber, and when the pressure of the hydraulic cylinder is increased by the other operation, the displacement of the spool is utilized to detect the increased pressure differential pressure.
【０００５】そして，両端に互いに同じ油圧作用面積を
持っているスプールを摺動可能に内蔵したケースの両側
の油圧室内にそれぞれ同じ能力のスプリングを取付け，
スプールの軸心部においてスプールロッドをスプールの
両端面からケースの外まで伸ばして設け，ケースの外の
スプールロッドの移動位置の回りに差動変圧器を設けた
増圧差圧検出装置を用い，スプールロッドの変位度合を
差動変圧器で検出して増圧差圧を検出するようにした。
なお，油圧シリンダを射出成形装置の型締シリンダとし
て用い，被加圧物体を可動盤や可動金型として用いるこ
とができる。Then, springs having the same capacity are mounted in the hydraulic chambers on both sides of a case in which spools having the same hydraulic working area are slidably housed at both ends, respectively.
A spool rod is provided extending from both end faces of the spool to the outside of the case at the shaft center of the spool, and a differential pressure transformer is provided around a moving position of the spool rod outside the case. The degree of displacement of the rod is detected by a differential transformer to detect the pressure increase differential pressure.
The hydraulic cylinder can be used as a mold clamping cylinder of the injection molding apparatus, and the object to be pressed can be used as a movable platen or a movable mold.
【０００６】上記の方法を実施するために用いる装置と
しては，物体を加圧保持する油圧シリンダと油圧回路の
途中にチエック弁を設けた油圧回路内において，両端に
互いに同じ面積を持っていて摺動可能なスプールを内蔵
したケースの両側の油圧室に前記チエック弁の前後の油
圧をそれぞれ連結し，前記両側の油圧室内にそれぞれ同
じ能力のスプリングを取付け，スプールの軸心部におい
てスプールロッドをスプールの端面からケースの外まで
伸ばして設け，ケースの外のスプールロッドの移動位置
の回りにスプールロッドの変位度合検出用の差動変圧器
を設け，差動変圧器の検出値に基づいて油圧シリンダの
増圧差圧を知り得る装置を設けたものとした。An apparatus used to carry out the above method includes a hydraulic cylinder for pressurizing and holding an object and a hydraulic circuit having a check valve in the middle of the hydraulic circuit and having the same area at both ends. The front and rear hydraulic pressures of the check valve are respectively connected to hydraulic chambers on both sides of a case having a built-in movable spool, and springs of the same capacity are respectively mounted in the hydraulic chambers on both sides, and a spool rod is spooled at a shaft center of the spool. A differential transformer for detecting the degree of displacement of the spool rod is provided around the moving position of the spool rod outside the case, and a hydraulic cylinder is provided based on the detected value of the differential transformer. And a device capable of knowing the pressure-increase pressure difference.
【０００７】上記ケースの両側の油圧室に型締シリンダ
加圧の油圧ラインのチエック弁の前後の油圧を導く。射
出プランジャで金型キャビティ内に溶湯を充填加圧し
て，その型開力が型締力より大きくなると，型締シリン
ダのラムは後退しようとし，型締シリンダ内の油圧は増
圧されるが，油圧回路にチエック弁があるので逆流はし
ない。この油を差圧検出器の一方の油圧室に導くと，ス
プールはその圧力差によってスプリングの力に打勝ち移
動する。その移動量を検知し，それに基づいて演算し，
油圧シリンダの増圧した圧力と規定圧力との差圧を検出
する。The hydraulic pressure before and after the check valve of the hydraulic line for pressurizing the mold clamping cylinder is guided to the hydraulic chambers on both sides of the case. When the injection plunger fills the mold cavity with molten metal and pressurizes it, and the mold opening force is greater than the mold clamping force, the ram of the mold clamping cylinder tries to retreat and the hydraulic pressure in the mold clamping cylinder is increased. There is no check flow because there is a check valve in the hydraulic circuit. When this oil is introduced into one hydraulic chamber of the differential pressure detector, the spool moves by overcoming the force of the spring due to the pressure difference. Detect the amount of movement, calculate based on it,
A differential pressure between the increased pressure of the hydraulic cylinder and a specified pressure is detected.
【０００８】一般に，このスプール端面の面積はシリン
ダ面積の１／４００〜１／４０００程度であり，ラムの
小さい後退量を拡大検出することができる。そして，こ
の移動量が一定を保つように射出プランジャの圧力また
は速度を制御すると，型締シリンダ内の増圧量は大きく
ならず，バリ吹きを防止することができる。Generally, the area of this spool end surface is about 1/400 to 1/4000 of the cylinder area, and a small retraction amount of the ram can be detected in an enlarged manner. If the pressure or speed of the injection plunger is controlled so that the amount of movement is kept constant, the amount of pressure increase in the mold clamping cylinder does not increase, so that burr blowing can be prevented.
【０００９】[0009]
【発明の実施の形態】図１は本発明の方法を実施するた
めに用いる装置の１実施例を示すもので，平衡状態を示
す縦断面図，図２は図１に示した装置の１作動状態を示
すもので，増圧差圧発生状態を示す縦断面図，図３は本
発明の装置を竪型ダイカストマシンに用いた場合の１例
を示す縦断面図および油圧回路図である。図１，図２に
おいて，１は増圧差圧検出器，２は両端面に互いに同じ
油圧作用面積を持っている円柱状のスプールで，スプー
ル２の軸心部において両端面部にそれぞれ小径で同径の
スプールロッド３を有する。FIG. 1 shows an embodiment of an apparatus used for carrying out the method of the present invention. FIG. 2 is a longitudinal sectional view showing an equilibrium state, and FIG. 2 shows one operation of the apparatus shown in FIG. FIG. 3 is a longitudinal sectional view showing a state in which a pressure increase differential pressure is generated, and FIG. 3 is a longitudinal sectional view and a hydraulic circuit diagram showing an example in which the apparatus of the present invention is used in a vertical die casting machine. 1 and 2, reference numeral 1 denotes a pressure-increased pressure difference detector, and 2 denotes a cylindrical spool having the same hydraulic working area on both end faces. Has a spool rod 3.
【００１０】４は検出器１のケースで，内部にスプール
２よりほんのわずかに大きい径でスプール２を軸線方向
に摺動させることのできる穴４ａを有し，ケース４内で
穴４ａの両側にそれぞれ油圧室４ｂ，４ｃを有する。両
方の油圧室４ｂ，４ｃ内には同じ能力を有し，スプール
２を中央に停止させるためのスプリング５およびストッ
プリング６を内蔵する。また，スプール２の両端のスプ
ールロッド３は検出器１のケース４の側壁の穴７を貫通
して外まで伸びており，その一方の外側のスプールロッ
ド３の移動位置の回りにスプールロッド３の変位度合検
出用ないしは位置検出用の管状の差動変圧器８を設け
る。９はスプールロッド３部分から油が洩れないように
しているシールリングである。そして，１０および１１
は油圧の出入口を形成している通路であり，例えば，通
路１０からの圧力が高くなると，図２に示すように，ス
プール２は右に押され，移動し，その位置を差動変圧器
８によって検出する。Reference numeral 4 denotes a case of the detector 1, which has a hole 4a inside which the spool 2 can be slid in the axial direction with a diameter slightly larger than that of the spool 2, and is provided inside the case 4 on both sides of the hole 4a. Each has a hydraulic chamber 4b, 4c. The two hydraulic chambers 4b and 4c have the same capacity, and incorporate a spring 5 and a stop ring 6 for stopping the spool 2 at the center. Further, the spool rods 3 at both ends of the spool 2 extend to the outside through the holes 7 in the side wall of the case 4 of the detector 1, and the spool rods 3 move around the moving position of the spool rod 3 on one outer side. A tubular differential transformer 8 for detecting the degree of displacement or detecting the position is provided. Reference numeral 9 denotes a seal ring for preventing oil from leaking from the spool rod 3. And 10 and 11
Is a passage forming an inlet / outlet of the hydraulic pressure. For example, when the pressure from the passage 10 increases, the spool 2 is pushed rightward and moves as shown in FIG. To detect.
【００１１】図３は竪型ダイカストマシン１２で型締を
行い，プランジャチップ１３で溶湯１４を金型キャビテ
ィ１５内に充填加圧している状態を示している。１６は
固定金型でもある下金型，１７は可動金型でもある上金
型で，上金型１７は可動盤１９に取付けられ，下金型１
６は固定盤１８に取付けられている。可動盤１９は型締
シリンダ２０のピストン２１によって加圧型締されてい
る。固定盤１８と型締シリンダ２０はタイバ２２によっ
て連結されている。２３はタイバナットである。また，
固定盤１８にはタイバ２４およびタイバナット２５を介
して射出シリンダ２６が取付けられていて，射出シリン
ダ２６のピストン２７の先端に射出プランジャ２８を介
してプランジャチップ１３が取付けられ，鋳込スリーブ
２９に給湯された溶湯１４を金型キャビティ１５内に充
填加圧する。FIG. 3 shows a state in which the mold is clamped by the vertical die casting machine 12 and the molten metal 14 is filled into the mold cavity 15 by the plunger tip 13 and pressurized. 16 is a lower mold which is also a fixed mold, 17 is an upper mold which is also a movable mold, and the upper mold 17 is mounted on a movable plate 19 and the lower mold 1
6 is attached to the fixed plate 18. The movable platen 19 is press-clamped by a piston 21 of a mold clamping cylinder 20. The fixed plate 18 and the mold clamping cylinder 20 are connected by a tie bar 22. 23 is a tie nut. Also,
An injection cylinder 26 is attached to the fixed plate 18 via a tie bar 24 and a tie nut 25, and a plunger tip 13 is attached to a tip of a piston 27 of the injection cylinder 26 via an injection plunger 28. The molten metal 14 is filled into the mold cavity 15 and pressurized.
【００１２】型締用の油圧は電磁四方切替弁３０および
チエック弁３１を通って型締シリンダ２０に供給され，
チエック弁３１の前後に増圧差圧検出器１の油出入口１
０，１１が連結される。射出シリンダ２６用の油圧は，
流量調整弁３２あるいは圧力調整弁３３，そして，電磁
四方切替弁３４を通って射出シリンダ２６に供給され
る。制御装置３５は増圧差圧検出器１の変位を圧力に換
算し，型締シリンダ２０の増圧された圧力と予め設定し
ておいた規定型締圧力との差圧を演算し，その演算値に
基づいて流量調整弁３２あるいは圧力調整弁３３の流量
あるいは圧力を制御するためのものである。The hydraulic pressure for mold clamping is supplied to the mold clamping cylinder 20 through an electromagnetic four-way switching valve 30 and a check valve 31.
Before and after the check valve 31, the oil inlet / outlet 1 of the pressure-increased pressure difference detector 1
0 and 11 are connected. The hydraulic pressure for the injection cylinder 26 is
The fuel is supplied to the injection cylinder 26 through a flow control valve 32 or a pressure control valve 33 and an electromagnetic four-way switching valve 34. The control device 35 converts the displacement of the pressure-increase differential pressure detector 1 into a pressure, calculates a differential pressure between the increased pressure of the mold clamping cylinder 20 and a preset specified clamping pressure, and calculates the calculated value. Is used to control the flow rate or pressure of the flow control valve 32 or the pressure control valve 33 based on
【００１３】次に，制御動作について説明する。金型キ
ャビティ１５の投影面積をＡ，型締シリンダ２０の油圧
源の圧力をｐco，型締シリンダ２０内の油圧の圧力をｐ
c ，射出シリンダ２６の油圧源の圧力をｐio，射出シリ
ンダ２６内の油圧の圧力をｐi とし，型締シリンダ２０
のピストン径をＤc ，射出シリンダ２６のピストン径を
Ｄi ，プランジャチップ１３の径をＤp とすると，金型
キャビティ１５内の溶湯１４が凝固していない時の溶湯
圧力ｐa は，Next, the control operation will be described. The projected area of the mold cavity 15 is A, the pressure of the hydraulic pressure source of the mold clamping cylinder 20 is p co , and the pressure of the hydraulic pressure in the mold clamping cylinder 20 is p
c , the pressure of the hydraulic pressure source of the injection cylinder 26 is p io , the pressure of the hydraulic pressure in the injection cylinder 26 is p i ,
Piston diameter D c of the piston diameter D i of the injection cylinder 26, the diameter of the plunger tip 13 When D p, the melt pressure p a at which the molten metal 14 in the mold cavity 15 is not solidified,
【００１４】[0014]
【数１】 (Equation 1)
【００１５】もし，金型キャビティ１５の投影面積が大
きいときは，If the projected area of the mold cavity 15 is large,
【００１６】[0016]
【数２】 (Equation 2)
【００１７】という事態が発生する。この場合，型締シ
リンダ２０のピストン２１は後退しようとするので，チ
エック弁３１を設置することで油が逃げることを防ぎ，
これにより型締シリンダ２０のピストン２１の後退を防
止するが，型締シリンダ２０内の油圧ｐc はThe above situation occurs. In this case, since the piston 21 of the mold clamping cylinder 20 tends to retreat, installing the check valve 31 prevents oil from escaping.
Thereby preventing retraction of the piston 21 of the mold clamping cylinder 20, but hydraulic p c in the mold clamping cylinder 20
【００１８】[0018]
【数３】 (Equation 3)
【００１９】と増圧される。型締シリンダ２０の油圧を
増圧差圧検出器１の入口１０に導く。他方の入口１１は
型締油圧源に連通している。型締シリンダ２０内が増圧
されたときｐc ＞ｐcoとなり，増圧差圧検出器１のスプ
ール２は図２に示すように右側に移動する。このときの
変位量をχ，型締シリンダ２０のピストン２１の後退量
をδとすると，The pressure is increased. The oil pressure of the mold clamping cylinder 20 is guided to the inlet 10 of the pressure-increased pressure difference detector 1. The other inlet 11 is in communication with a mold clamping hydraulic source. When the pressure inside the mold clamping cylinder 20 is increased, p c > p co , and the spool 2 of the increased pressure differential pressure detector 1 moves to the right as shown in FIG. Assuming that the displacement amount at this time is χ and the retreat amount of the piston 21 of the mold clamping cylinder 20 is δ,
【００２０】[0020]
【数４】 (Equation 4)
【００２１】例えば，ｄS ＝２０ｍｍ，ｄR ＝１０ｍ
ｍ，Ｄc ＝８００ｍｍとすると，For example, d S = 20 mm, d R = 10 m
If m and D c = 800 mm,
【００２２】[0022]
【数５】 (Equation 5)
【００２３】となり，実用上の検出値をχ＝１０ｍｍ程
度とすれば， δ≒１／２００ｍｍ となり，微小な変位を測定できる。If the practical detection value is about χ = 10 mm, δ ≒ 1/200 mm, and a minute displacement can be measured.
【００２４】このように，型締シリンダ２０のピストン
２１の微小な変位を，例えば，差動変圧器８などで検出
し，制御装置３５を介して，流量調整弁３２あるいは圧
力調整弁３３によって流量あるいは圧力を制御して，射
出圧力ｐi を制御する。溶湯の凝固が進行するに従いパ
スカルの原理が働かなくなるので，射出シリンダ２６の
油圧圧力ｐi を大きくしても型締シリンダ２０の油圧圧
力ｐc は余り大きくならないので，最終的には，ｐi ＝
ｐioとして溶湯を加圧する。このように，バリ吹きに関
係のない微小な変位を検出して射出圧力を制御できるの
で，バリ吹きを防止しながら大きい力で射出加圧するこ
とができる。As described above, the minute displacement of the piston 21 of the mold clamping cylinder 20 is detected by, for example, the differential transformer 8 or the like, and the flow rate is controlled by the flow control valve 32 or the pressure control valve 33 via the control device 35. Alternatively, the injection pressure p i is controlled by controlling the pressure. Since the solidification of the molten metal will not work Pascal principle of accordance progresses, since the hydraulic pressure p c of the hydraulic pressure even when the p i is increased clamping cylinder 20 of the injection cylinder 26 is not too large, eventually, p i =
pressurizing the molten metal as p io. As described above, since the injection pressure can be controlled by detecting a minute displacement that is not related to the burr blowing, the injection pressurization can be performed with a large force while preventing the burr blowing.
【００２５】[0025]
【発明の効果】本発明においては，特許請求の範囲に記
載したような方法および装置を用いたので，増圧による
油圧シリンダのピストン等の微小な変位を例えば４００
〜４０００倍に拡大して確実容易に検出することができ
る。それにともなって，射出力を制御できるので，ダイ
カストマシンや射出成形機等において，型締シリンダの
ピストンの後退を最小限に抑えることができ，バリを吹
くことなく，大きい製品も成形することができる。ま
た，その他，外力により増圧されるシリンダの外力の制
御に用いて安定した位置制御を行うことができる。According to the present invention, since the method and the device described in the claims are used, a minute displacement of the piston of the hydraulic cylinder due to the pressure increase is, for example, 400 mm.
It can be reliably and easily detected by up to 4000 times. Accordingly, since the injection power can be controlled, the retraction of the piston of the mold clamping cylinder can be minimized in a die casting machine or an injection molding machine, and a large product can be formed without blowing burrs. . In addition, stable position control can be performed by controlling the external force of the cylinder which is increased in pressure by the external force.
【図１】本発明の方法を実施するために用いる装置の１
実施例を示す縦断面図であり，平衡状態を示す図であ
る。FIG. 1 shows one of the devices used to carry out the method of the invention.
It is a longitudinal section showing an example, and is a figure showing an equilibrium state.
【図２】図１に示す装置の１作動状態を示す縦断面図で
あり，増圧差圧発生状態を示す図である。FIG. 2 is a longitudinal sectional view showing one operation state of the apparatus shown in FIG. 1, and is a view showing a pressure increasing differential pressure generation state.
【図３】本発明の装置を竪型ダイカストマシンに用いた
場合の１例を示す縦断面図および油圧回路図である。FIG. 3 is a longitudinal sectional view and a hydraulic circuit diagram showing an example when the apparatus of the present invention is used in a vertical die casting machine.
１ 増圧差圧検出器 ２ スプール ３ スプールロッド ４ ケース ５ スプリング ８ 差動変圧器 １２ 竪型ダイカストマシン １３ プランジャチップ １４ 溶湯 １５ 金型キャビティ １６ 下金型（固定金型） １７ 上金型（可動金型） １８ 固定盤 １９ 可動盤 ２０ 型締シリンダ ２６ 射出シリンダ ２８ 射出プランジャ ２９ 鋳込スリーブ ３０，３４ 電磁四方切替弁 ３１ チエック弁 ３２ 流量調整弁 ３３ 圧力調整弁 ３５ 制御装置 DESCRIPTION OF SYMBOLS 1 Booster differential pressure detector 2 Spool 3 Spool rod 4 Case 5 Spring 8 Differential transformer 12 Vertical die casting machine 13 Plunger chip 14 Melt 15 Mold cavity 16 Lower mold (fixed mold) 17 Upper mold (Movable mold) 18) Fixed board 19 Movable board 20 Mold clamping cylinder 26 Injection cylinder 28 Injection plunger 29 Casting sleeve 30, 34 Electromagnetic four-way switching valve 31 Check valve 32 Flow control valve 33 Pressure control valve 35 Control device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０１Ｂ 7/00 Ｇ０１Ｂ 7/00 Ｄ ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI Technical display location G01B 7/00 G01B 7/00 D
Claims (4)
ていて，その被加圧物体に他の動作で発生した荷重が作
用し油圧シリンダのピストンまたはラムを後退させる力
が働くとき，その後退を防止するためにチエック弁を油
圧回路内に組込んだものにおいて，両端に互いに同じ面
積を持っていて摺動可能なスプールを内蔵したケースの
両側の油圧室に前記チエック弁の前後の油圧をそれぞれ
連結し，前記他の動作によって油圧シリンダの圧力が増
圧された場合にスプールが変位することを利用して増圧
差圧を検出するようにした油圧シリンダの増圧差圧検出
方法。When a load generated by another operation acts on a pressurized object by applying pressure to a pressurized object by using a hydraulic cylinder and a force for retracting a piston or a ram of the hydraulic cylinder acts on the pressurized object, In order to prevent retraction, a check valve is incorporated in a hydraulic circuit. And a pressure increase differential pressure detection method for a hydraulic cylinder, wherein the pressure increase differential pressure is detected by utilizing displacement of the spool when the pressure of the hydraulic cylinder is increased by the other operation.
いるスプールを摺動可能に内蔵したケースの両側の油圧
室内にそれぞれ同じ能力のスプリングを取付け，スプー
ルの軸心部においてスプールロッドをスプールの端面か
らケースの外まで伸ばして設け，ケースの外のスプール
ロッドの移動位置の回りに差動変圧器を設けた増圧差圧
検出装置を用い，スプールロッドの変位度合を差動変圧
器で検出して増圧差圧を検出するようにした請求項１記
載の油圧シリンダの増圧差圧検出方法。2. A spring having the same capacity is installed in both hydraulic chambers on both sides of a case in which spools having the same hydraulic working area are slidably housed at both ends, and a spool rod is attached to the spool at the shaft center portion. The differential pressure transformer detects the degree of displacement of the spool rod by using a differential pressure transformer with a differential transformer provided around the moving position of the spool rod outside the case. 2. A method for detecting a pressure increase pressure difference of a hydraulic cylinder according to claim 1, wherein the pressure increase pressure difference is detected by using the pressure increase pressure difference detection method.
ンダとして用い，被加圧物体を可動盤や可動金型として
用いた請求項１または請求項２記載の油圧シリンダの増
圧差圧検出方法。3. The method according to claim 1, wherein the hydraulic cylinder is used as a mold clamping cylinder of an injection molding apparatus, and the object to be pressed is used as a movable platen or a movable mold.
回路の途中にチエック弁を設けた油圧回路内において，
両端に互いに同じ面積を持っていて摺動可能なスプール
を内蔵したケースの両側の油圧室に前記チエック弁の前
後の油圧をそれぞれ連結し，前記両側の油圧室内にそれ
ぞれ同じ能力のスプリングを取付け，スプールの軸心部
においてスプールロッドをスプールの端面からケースの
外まで伸ばして設け，ケースの外のスプールロッドの移
動位置の回りにスプールロッドの変位度合検出用の差動
変圧器を設け，差動変圧器の検出値に基づいて油圧シリ
ンダの増圧差圧を知り得る装置を設けた油圧シリンダの
増圧差圧検出装置。4. In a hydraulic circuit provided with a hydraulic cylinder for pressurizing and holding an object and a check valve in the middle of the hydraulic circuit,
Hydraulic chambers before and after the check valve are connected to hydraulic chambers on both sides of a case having slidable spools having the same area at both ends, and springs having the same capacity are mounted in the hydraulic chambers on both sides. A spool rod is provided extending from the end surface of the spool to the outside of the case at the shaft center of the spool, and a differential transformer for detecting the degree of displacement of the spool rod is provided around the position of movement of the spool rod outside the case. An apparatus for detecting a pressure increase pressure difference of a hydraulic cylinder provided with a device capable of knowing a pressure increase pressure difference of the hydraulic cylinder based on a detection value of a transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16739796A JPH109977A (en) | 1996-06-27 | 1996-06-27 | Method and apparatus for detection of intensified differential pressure of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16739796A JPH109977A (en) | 1996-06-27 | 1996-06-27 | Method and apparatus for detection of intensified differential pressure of hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH109977A true JPH109977A (en) | 1998-01-16 |
Family
ID=15848951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16739796A Pending JPH109977A (en) | 1996-06-27 | 1996-06-27 | Method and apparatus for detection of intensified differential pressure of hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH109977A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990010879A1 (en) * | 1989-03-15 | 1990-09-20 | Schonstedt Instrument Company | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables |
| KR100384576B1 (en) * | 2000-11-16 | 2003-05-22 | 현대산업개발 주식회사 | measure for Jack support |
| KR100547575B1 (en) * | 1998-12-22 | 2006-04-14 | 두산인프라코어 주식회사 | Differential pressure generator |
| JP2006321203A (en) * | 2005-05-20 | 2006-11-30 | Toshihara Technos:Kk | Molding machine |
-
1996
- 1996-06-27 JP JP16739796A patent/JPH109977A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990010879A1 (en) * | 1989-03-15 | 1990-09-20 | Schonstedt Instrument Company | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables |
| KR100547575B1 (en) * | 1998-12-22 | 2006-04-14 | 두산인프라코어 주식회사 | Differential pressure generator |
| KR100384576B1 (en) * | 2000-11-16 | 2003-05-22 | 현대산업개발 주식회사 | measure for Jack support |
| JP2006321203A (en) * | 2005-05-20 | 2006-11-30 | Toshihara Technos:Kk | Molding machine |
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