JP2648514B2 - Load cell for 2-range pressure control - Google Patents
Load cell for 2-range pressure controlInfo
- Publication number
- JP2648514B2 JP2648514B2 JP1160698A JP16069889A JP2648514B2 JP 2648514 B2 JP2648514 B2 JP 2648514B2 JP 1160698 A JP1160698 A JP 1160698A JP 16069889 A JP16069889 A JP 16069889A JP 2648514 B2 JP2648514 B2 JP 2648514B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- strain gauge
- detecting
- connecting member
- annular connecting
- 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.)
- Expired - Fee Related
Links
Landscapes
- Measurement Of Force In General (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は例えば射出成形機の射出時および計量時の
圧力を精度よく検出することの可能な２レンジ圧力制御
用ロードセルに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-range pressure control load cell capable of accurately detecting, for example, pressure during injection and measurement of an injection molding machine.
（従来の技術） 電動射出成形機において、従来射出圧および計量時の
背圧を検知するために、加熱シリンダに樹脂圧センサー
を設けたもの、或いは射出機構にロードセルを設けて樹
脂に加える圧力を検知するものが知られている。前記ロ
ードセルとして第５図と第６図に示すようなものが知ら
れている。第５図に示すものは直線はり受感型で、直線
はりａの中心に荷重Ｆを加え、その両側に取りつけた歪
みゲージｂで圧力を検知する。又第６図に示すものは中
空円筒受感型で、中空円筒ｃの外側に取りつけた歪みゲ
ージｂで圧力を検出するようになっている。(Prior Art) In an electric injection molding machine, in order to detect a conventional injection pressure and a back pressure at the time of measurement, a heating cylinder is provided with a resin pressure sensor, or an injection mechanism is provided with a load cell to apply a pressure applied to a resin. What detects is known. The load cell shown in FIGS. 5 and 6 is known. The one shown in FIG. 5 is a linear beam-sensitive type, in which a load F is applied to the center of a linear beam a, and the pressure is detected by strain gauges b attached to both sides thereof. FIG. 6 shows a hollow cylinder sensitive type in which pressure is detected by a strain gauge b attached to the outside of the hollow cylinder c.
ところが前者においては、樹脂圧センサーが高温下
（400℃以上）で信頼性がないのと、ダイヤフラム部の
薄膜がすぐに疲労するので、寿命が短いという欠点があ
り、樹脂圧センサーを加熱シリンダに設けたものについ
ては問題がある。However, the former has the disadvantage that the resin pressure sensor is unreliable at high temperatures (over 400 ° C) and the thin film of the diaphragm quickly fatigues, resulting in a short life. There is a problem with the provisions.
また、後者においては、歪みゲージ式ロードセルをそ
の機構に加わる負荷の最大値のレンジに設定しないとロ
ードセルが破損するおそれがあり、射出圧に比べて小さ
なレンジしか必要としない計量背圧制御において、大レ
ンジの設定で測定するからノイズが大きく精密な背圧検
出が期待できないという問題がある。In the latter, the load cell may be damaged unless the strain gauge type load cell is set to the range of the maximum value of the load applied to the mechanism, and in the measurement back pressure control that requires only a small range compared to the injection pressure, Since measurement is performed in a large range setting, there is a problem that noise is large and accurate back pressure detection cannot be expected.
（発明が解決しようとする課題） 本発明は公知ロードセルの問題を解決するため、大レ
ンジ用と小レンジ精密用の２つの信号を切換えて使うこ
とができるようにして、射出成形機の射出圧の制御及び
精密な背圧制御を行うことができるロードセルを提供し
ようとするものである。(Problems to be Solved by the Invention) In order to solve the problem of the known load cell, the present invention makes it possible to switch between two signals for a large range and a small range for precision and to use an injection pressure of an injection molding machine. And a load cell capable of performing precise back pressure control.
（課題を解決するための手段） 上端に荷重受部材４が固着された中心部構造体１と、
これと同心で該中心部構造体１を囲繞する環状の中間部
構造体２と、同じく該中間部構造体２を囲繞し、これと
同心で下端に固定部材５が固着された環状の外側構造体
３を備え、 前記中心部構造体１の下部は固定部材５の中心部に穿
設された穴に摺動可能に嵌挿されており、 前記中心部構造体１と中間部構造体２は柔構造の環状
連結部材６で連結され、該環状連結部材６に低荷重検出
用の歪ゲージＡが設けられており、又中間部構造体２と
外側構造体３は高剛性の環状連結部材７で連結され、該
環状連結部材７に高荷重検出用の歪ゲージＢが設けられ
ており、 前記荷重受部材４の下端と中間部構造体２の上端は無
負荷時には環状連結部材６の安全撓み量δだけ離間し、
オーバー荷重がかかると荷重受部材４の下端と中間部構
造体２の上端とが当接するようになっている。(Means for Solving the Problems) A central structure 1 having a load receiving member 4 fixed to an upper end thereof;
An annular intermediate structure 2 concentrically surrounding the central structure 1, and an annular outer structure surrounding the intermediate structure 2 and having a fixed member 5 fixed to the lower end concentrically therewith; A lower part of the central structure 1 is slidably fitted into a hole formed in the center of the fixing member 5, and the central structure 1 and the intermediate structure 2 are An annular connecting member 6 having a flexible structure is provided, and the annular connecting member 6 is provided with a strain gauge A for detecting a low load. And the annular connecting member 7 is provided with a strain gauge B for detecting a high load. The lower end of the load receiving member 4 and the upper end of the intermediate structure 2 are safely bent when the load is not applied. Separated by an amount δ,
When an overload is applied, the lower end of the load receiving member 4 and the upper end of the intermediate structure 2 come into contact with each other.
又射出成形機の射出時および保圧時に高荷重検出用の
歪ゲージＢによる大レンジ信号を、又計量時に低荷重検
出用の歪ゲージＡによる小レンジ信号を検出し、これを
フィードバック信号として圧力制御するようにした。At the time of injection and holding pressure of the injection molding machine, a large range signal is detected by the strain gauge B for detecting a high load, and a small range signal is detected by the strain gauge A for detecting a low load at the time of weighing. Controlled.
（実施例） 第１図〜第４図に基いて説明する。第１図は本発明に
係るロードセルの縦断面図、第２図は同じく平面図であ
る。(Example) A description will be given based on FIGS. 1 to 4. FIG. 1 is a longitudinal sectional view of a load cell according to the present invention, and FIG. 2 is a plan view of the same.
第１図で明らかなように、本発明のロードセルは同心
的に配設された３つの構造体を主として構成されてい
る。即ち、１は中心部構造体、２はこれと同心で該中心
部構造体１を囲繞するように設けられた中間部構造体、
３は同じく該中間部構造体２を囲繞するように設けられ
た外側構造体である。As is clear from FIG. 1, the load cell of the present invention mainly comprises three concentrically arranged structures. That is, 1 is a central structure, 2 is an intermediate structure provided concentrically around the central structure 1,
Reference numeral 3 denotes an outer structure provided so as to surround the intermediate structure 2.
中心部構造体１はその一端に荷重受部材４が固着され
ている。又外側構造体３の一端は固定部材５に固着され
ている。中心部構造体１の他端は固定部材５の中心部に
穿設された穴に嵌入され、固定部材５に対し摺動可能で
ある。The center structure 1 has a load receiving member 4 fixed to one end thereof. One end of the outer structure 3 is fixed to the fixing member 5. The other end of the center structure 1 is fitted into a hole formed in the center of the fixing member 5 and is slidable with respect to the fixing member 5.
６は中心部構造体１と中間部構造体２を連結する柔構
造の環状連結部材で、これに低荷重検出用の歪ゲージＡ
が設けられている。又中間部構造体２と外側構造体３と
の間は高剛性の環状連結部材７で連結され、これにも高
荷重検出用の歪ゲージＢが設けられている。前記荷重受
部材４と中間部構造体２とは対向配置されており、無負
荷状態で距離δ（環状連結部材６の安全撓み量）だけ離
間されており、オーバー荷重がかかると荷重受部材４と
中間部構造体２とが当接するようになっている。Reference numeral 6 denotes a flexible annular connecting member for connecting the central structure 1 and the intermediate structure 2 to each other.
Is provided. The intermediate structure 2 and the outer structure 3 are connected by a high-rigidity annular connecting member 7, which is also provided with a strain gauge B for detecting a high load. The load receiving member 4 and the intermediate structure 2 are disposed to face each other, are separated by a distance δ (the amount of safe bending of the annular connecting member 6) in a no-load state, and when an overload is applied, the load receiving member 4 And the intermediate structure 2 are in contact with each other.
さて、本発明に係るロードセルは第３図のモデル図で
明らかなように、１つの荷重検出系に柔構造部と高剛性
部を設け、それぞれに歪ゲージＡ又はＢを設けて低荷重
検出用，高荷重検出用としている。そして、低荷重検出
用の歪ゲージＡで計測時の背圧制御を、又高荷重検出用
の歪ゲージＢで射出圧及び保圧の制御を行う。Now, the load cell according to the present invention is provided with a flexible structure portion and a high rigidity portion in one load detection system, and a strain gauge A or B provided in each load detection system as shown in the model diagram of FIG. , For heavy load detection. Then, the back pressure control at the time of measurement is performed by the strain gauge A for detecting the low load, and the injection pressure and the holding pressure are controlled by the strain gauge B for detecting the high load.
前記成形時には低荷重検出用の歪ゲージＡにオーバー
荷重がかかろうとするが、荷重受部材４がストッパがわ
りになって、低荷重検出用にオーバー荷重がかからない
ようになっている。At the time of molding, an overload is likely to be applied to the strain gauge A for detecting a low load, but the load receiving member 4 serves as a stopper so that an overload is not applied for detecting the low load.
以上は射出成形機に適用した例についてのべたが、小
レンジで精密な力制御を必要とするが、同じ機構に大き
な負担をも受けることのある力発生装置に対しても好適
である。Although the above is an example applied to an injection molding machine, the present invention is suitable for a force generating device which requires precise force control in a small range, but which may receive a large load on the same mechanism.
（効果） 第４図は負荷Ｆと歪ゲージで発する出力信号ｅの関係
を示すグラフである。第４図で示すように、高荷重用の
歪ゲージＢの検出系においては、ノイズレベルの出力e1
が荷重f1以上になっているのに対し、低荷重用の歪ゲー
ジＡの検出系においてはf1に比べて非常に低レベルとな
っている。又−f1〜f1間の高荷重用の歪ゲージＢの検出
系では負荷Ｆの変動に対して出力の変動が非常に大きい
ので精密な力の制御ができることを示し、本発明の所期
の目的が達成されていることがわかる。(Effect) FIG. 4 is a graph showing the relationship between the load F and the output signal e generated by the strain gauge. As shown in FIG. 4, in the detection system of the strain gauge B for high load, the output e 1 of the noise level is used.
There contrast has become a load f 1 above, has a very low level as compared with f 1 in the detection system of the strain gauges A for low load. Further, it is shown that the detection system of the strain gauge B for a high load between −f 1 and f 1 has a very large output variation with respect to the variation of the load F, so that precise force control can be performed. It can be seen that the purpose has been achieved.
第１図は本発明の実施例を示す断面図。 第２図は第１図の平面図。 第３図は本発明の２レンジ式荷重検出器のモデル図。 第４図はロードセルの２つの信号出力と荷重との関係を
示すグラフ。 第５図は公知直線はり受感型ロードセルを示し、第５図
（ａ）は断面図、第５図（ｂ）は平面図。 第６図は同じく中空円筒受感型ロードセルを示し、第６
図（ａ）は断面図、第６図（ｂ）は第６図のVI−VI矢視
断面図。 図において； A,B……歪ゲージ １……中心部構造体、２……中間部構造体 ３……外側構造体、４……荷重受部材 ５……固定部材、６……環状連結部材 ７……環状連結部材FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a plan view of FIG. FIG. 3 is a model diagram of a two-range type load detector of the present invention. FIG. 4 is a graph showing the relationship between two signal outputs of the load cell and the load. FIG. 5 shows a known linear beam-sensitive load cell, FIG. 5 (a) is a sectional view, and FIG. 5 (b) is a plan view. FIG. 6 also shows a hollow cylindrical sensitive load cell.
6A is a sectional view, and FIG. 6B is a sectional view taken along line VI-VI of FIG. In the figure, A, B... Strain gauge 1... Central structure 2... Intermediate structure 3... Outer structure 4... Load receiving member 5. 7 ... Circular connecting member
Claims (2)
部構造体（１）と、これと同心で該中心部構造体（１）
を囲繞する環状の中間部構造体（２）と、同じく該中間
部構造体（２）を囲繞し、これと同心で下端に固定部材
（５）が固着された環状の外側構造体（３）を備え、 前記中心部構造体（１）の下部は固定部材（５）の中心
部に穿設された穴に摺動可能に嵌挿されており、 前記中心部構造体（１）と中間部構造体（２）は柔構造
の環状連結部材（６）で連結され、該環状連結部材
（６）に低荷重検出用の歪ゲージ（Ａ）が設けられてお
り、又中間部構造体（２）と外側構造体（３）は高剛性
の環状連結部材（７）で連結され、該環状連結部材
（７）に高荷重検出用の歪ゲージ（Ｂ）が設けられてお
り、 前記荷重受部材（４）の下端と中間部構造体（２）の上
端は無負荷時には環状連結部材（６）の安全撓み量δだ
け離間し、オーバー荷重がかかると荷重受部材（４）の
下端と中間部構造体（２）の上端とが当接するようにな
っていることを特徴とする２レンジ圧力制御用ロードセ
ル。A central structure (1) having a load receiving member (4) fixed to an upper end thereof, and the central structure (1) concentric with the central structure (1).
And an annular outer structure (3) surrounding the intermediate structure (2) and having a fixing member (5) fixed to the lower end concentrically with the intermediate structure (2) A lower portion of the central structure (1) is slidably fitted into a hole formed in a central portion of the fixing member (5), and the central structure (1) and an intermediate portion are provided. The structural body (2) is connected by a flexible annular connecting member (6), the annular connecting member (6) is provided with a strain gauge (A) for detecting a low load, and the intermediate structural body (2) ) And the outer structure (3) are connected by a high-rigidity annular connecting member (7), and the annular connecting member (7) is provided with a strain gauge (B) for detecting a high load. The lower end of (4) and the upper end of the intermediate structure (2) are separated from each other by the safe bending amount δ of the annular connecting member (6) when no load is applied, and an overload is applied. That the lower end 2 range pressure control load cell, characterized in that the upper end of the intermediate portion structure (2) is adapted to abut the load receiving member (4).
検出用の歪ゲージ（Ｂ）による大レンジ信号を、又計量
時に低荷重検出用の歪ゲージ（Ａ）による小レンジ信号
を検出し、これをフィードバック信号として圧力制御す
るようにしたことを特徴とする請求項第１項記載のロー
ドセルを用いた射出成形機の圧力制御装置。2. A large range signal is detected by a strain gauge (B) for detecting a high load during injection and pressure holding of an injection molding machine, and a small range signal is detected by a strain gauge (A) for detecting a low load during weighing. 2. A pressure control apparatus for an injection molding machine using a load cell according to claim 1, wherein the pressure is controlled as a feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1160698A JP2648514B2 (en) | 1989-06-26 | 1989-06-26 | Load cell for 2-range pressure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1160698A JP2648514B2 (en) | 1989-06-26 | 1989-06-26 | Load cell for 2-range pressure control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0326930A JPH0326930A (en) | 1991-02-05 |
| JP2648514B2 true JP2648514B2 (en) | 1997-09-03 |
Family
ID=15720539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1160698A Expired - Fee Related JP2648514B2 (en) | 1989-06-26 | 1989-06-26 | Load cell for 2-range pressure control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2648514B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005003494A (en) * | 2003-06-11 | 2005-01-06 | Sharp Corp | Panel sensor and information equipment having the same |
| JP2011209137A (en) * | 2010-03-30 | 2011-10-20 | Yamato Scale Co Ltd | Multi-force component load cell and tire testing machine using the same |
| JP2012007988A (en) * | 2010-06-24 | 2012-01-12 | Tokai Rubber Ind Ltd | Input interface device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518615A (en) * | 1978-07-27 | 1980-02-08 | Toray Ind Inc | Radiation sensitive material |
| JPS60164229A (en) * | 1984-02-07 | 1985-08-27 | Nec Corp | Force converter |
-
1989
- 1989-06-26 JP JP1160698A patent/JP2648514B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005003494A (en) * | 2003-06-11 | 2005-01-06 | Sharp Corp | Panel sensor and information equipment having the same |
| JP2011209137A (en) * | 2010-03-30 | 2011-10-20 | Yamato Scale Co Ltd | Multi-force component load cell and tire testing machine using the same |
| JP2012007988A (en) * | 2010-06-24 | 2012-01-12 | Tokai Rubber Ind Ltd | Input interface device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0326930A (en) | 1991-02-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |