JPH0326930A - Load cell for two range pressure control - Google Patents

Load cell for two range pressure control

Info

Publication number
JPH0326930A
JPH0326930A JP16069889A JP16069889A JPH0326930A JP H0326930 A JPH0326930 A JP H0326930A JP 16069889 A JP16069889 A JP 16069889A JP 16069889 A JP16069889 A JP 16069889A JP H0326930 A JPH0326930 A JP H0326930A
Authority
JP
Japan
Prior art keywords
load
pressure
load cell
highly rigid
strain gauge
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
Application number
JP16069889A
Other languages
Japanese (ja)
Other versions
JP2648514B2 (en
Inventor
Shin Kobayashi
伸 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP1160698A priority Critical patent/JP2648514B2/en
Publication of JPH0326930A publication Critical patent/JPH0326930A/en
Application granted granted Critical
Publication of JP2648514B2 publication Critical patent/JP2648514B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Measurement Of Force In General (AREA)

Abstract

PURPOSE:To enable a back pressure to be accurately detected by constructing a load cell by a highly rigid portion and a soft structure portion and enabling wide range output signals and highly accurate small range output signals to be taken out from strain gages provided in the highly rigid portion and soft structure portion, respectively. CONSTITUTION:A load detection system is provided with a soft structure portion and a highly rigid portion. Strain gages A and B are provided on the soft structure portion and the highly rigid portion for detecting low and high loads, respectively. The low load detecting strain gage A controls a back pressure and the high load detecting strain gage B controls an injection pressure and a holding pressure, respectively, in a measurement. While an overload tends to be applied to the low load detecting strain gage A in molding, a load receiving member 4 acts as a stopper to prevent the overload from being applied in a low load detection. Thus, the injection pressure and the back pressure in weighing can be accurately detected.

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.(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. ところが前者においては、樹脂圧センサーが高温下(4
 0 0℃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,寿命が短かいという欠点
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。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a two-range pressure control load cell that can accurately detect the pressure during injection and metering of an injection molding machine, for example. (Prior art) In conventional electric injection molding machines, in order to detect injection pressure and back pressure during metering, a resin pressure sensor is installed in the heating cylinder, or a load cell is installed in the injection mechanism to detect the pressure applied to the resin. What it detects is known. As the load cell, those shown in FIGS. 5 and 6 are known. The one shown in Figure 5 is a linear beam sensitive type, in which a load F is applied to the center of a straight beam a, and the pressure is detected by strain gauges b attached to both sides of the beam. The one shown in Fig. 6 is of the hollow cylinder sensitive type, and the pressure is detected by a strain gauge b attached to the outside of the hollow cylinder C. However, in the former case, the resin pressure sensor is exposed to high temperatures (4
There are disadvantages in that it is unreliable at temperatures above 00°C) and has a short lifespan because the thin film on the diaphragm part fatigues quickly, and there are problems with those in which the resin pressure sensor is installed in the heating cylinder.

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 addition, in the latter case, there is a risk of damage to the strain gauge type load cell unless it is set in the range that corresponds to the maximum load applied to the mechanism.In metering back pressure control, which requires only a small range compared to the injection pressure, There is a problem in that since the measurement is performed using a large range setting, the 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、射出戊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 problems of known load cells, the present invention makes it possible to switch and use two signals, one for large range and one for small range precision, and The present invention aims to provide a load cell that can control pressure and precisely control back pressure.

(課題を解決するための手段) 高剛性部と変位量を規制した柔構造部とを有し、高剛性
部に設けた歪みゲージから大レンジの出力信号を、又柔
構造部の歪みゲージから小レンジかつ高精度の出力信号
を取り出すことができるようにした。
(Means for solving the problem) It has a high rigidity part and a flexible structure part that regulates the amount of displacement, and a wide range of output signals are output from the strain gauge provided in the high rigidity part, and from the strain gauge in the flexible structure part. It is now possible to extract output signals with small range and high precision.

又、射出成形機の射出時および保圧時に大レンジ信号を
、又計量時に小レンジ信号を検出し、これをフィードバ
ック信号として射出成形機の圧力制御ができるようにし
た。
In addition, a large range signal is detected during injection and pressure holding of the injection molding machine, and a small range signal is detected during metering, and these are used as feedback signals to control the pressure of the injection molding machine.

(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
. 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威されている.
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■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。
(Example) An explanation 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 thereof. As is clear from Figure 1, the load cell of the present invention mainly consists of three structures arranged concentrically.
That is, 1 is a central structure, 2 is an intermediate structure provided concentrically therewith and surrounding the central structure 2, and 3 is also provided to surround the intermediate structure 2. is an outer structure.

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。
A load receiving member 4 is fixed to one end of the central structure 1. Further, one end of the outer structure 3 is fixed to a fixing member 5. The other end of the central structure 1 is fitted into a hole drilled in the center of the fixing member 5, and is slidable relative 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,,v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 that connects the central structure 1 and the intermediate structure 2, and is provided with a strain gauge A for low load detection. Further, the intermediate structure 2 and the outer structure 3 are connected by a highly rigid 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 arranged facing each other, and are separated by a distance δ (the safe deflection amount of the annular connecting member 6) in the v load state, and when an overload is applied, the load receiving member 4 4 and the intermediate structure 2 are brought into 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, as is clear from the model diagram in Fig. 3, the load cell according to the present invention has a flexible structure part and a high rigidity part in one load detection system, and a strain gauge A or B is provided in each of them for low load detection. , for high load detection. The strain gauge A for low load detection controls back pressure during measurement, and the strain gauge B for high load detection controls injection pressure and holding pressure.

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がストツパがわり
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.以上は射出成形機に適用した例につい
てのべた?,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. (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、歪ゲージBの
検出系においては,ノイズレベルの出力e■が荷重f1
以上になっているのに対し、ゲージAの検出系において
はfエに比べて非常に低レベルとなっている。又一f1
〜f1の間の歪ゲージ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。
During the molding process, an overload tends to be applied to the strain gauge A for low load detection, but the load receiving member 4 acts as a stopper to prevent overload from being applied to the strain gauge A for low load detection. Did the above describe an example of application to an injection molding machine? , Requires precise force control in a small range,
It is also suitable for force-generating devices where the same mechanism is subject to heavy loads. (Effects) Figure 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 strain gauge B, the noise level output e■ is the load f1.
On the other hand, in the detection system of gauge A, the level is very low compared to fE. Mataichi f1
In the detection system of the strain gauge B between ~f1, the output fluctuations are very large with respect to the fluctuations in the load F, indicating that precise force control is possible, and the intended purpose of the present invention has been achieved. I understand.

【図面の簡単な説明】 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 以上
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a plan view of FIG. 1. Figure 3 is a model diagram of the two-range load detector of the present invention. Figure 4 is a graph showing the relationship between the two signal outputs of the load cell and the load. FIG. 5 shows a known linear beam sensitive type load cell, with FIG. 5(a) being a sectional view and FIG. 5(b) being a plan view. Figure 6 also shows a hollow cylindrical sensitive type load cell;
Figure (a) is a cross-sectional view, and Figure 6 (b) is VI-VI in Figure 6.
Arrow sectional view. In the figure; A, B Strain gauge 1 Central structure 2 Intermediate structure 3 Outer structure 4 Load receiving member 5 Fixed member 6 Annular connecting member 7 Annular connecting member and above

Claims (2)

【特許請求の範囲】[Claims] (1)高剛性部と変位量を規制した柔構造部とを有し、
高剛性部に設けた歪みゲージから大レンジの出力信号を
、又柔構造部の歪みゲージから小レンジかつ高精度の出
力信号を取り出すことができるようにしたことを特徴と
する射出成形機用2レンジ圧力制御用ロードセル。
(1) It has a high rigidity part and a flexible structure part that regulates the amount of displacement,
2 for an injection molding machine, characterized in that a large range output signal can be extracted from a strain gauge provided in a highly rigid part, and a small range and high precision output signal can be extracted from a strain gauge provided in a flexible structure part. Load cell for range pressure control.
(2)射出成形機の射出時および保圧時に大レンジ信号
を、又計量時に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(1)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 during injection and pressure holding of the injection molding machine, and a small range signal is detected during metering, and the pressure is controlled using these signals as feedback signals. A pressure control device for an injection molding machine using a load cell.
JP1160698A 1989-06-26 1989-06-26 Load cell for 2-range pressure control Expired - Fee Related JP2648514B2 (en)

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 true JPH0326930A (en) 1991-02-05
JP2648514B2 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)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4137710B2 (en) * 2003-06-11 2008-08-20 シャープ株式会社 Panel sensor and information device equipped with the same
JP5442514B2 (en) * 2010-03-30 2014-03-12 大和製衡株式会社 Multi-component load cell and tire testing machine using the same
JP5486417B2 (en) * 2010-06-24 2014-05-07 東海ゴム工業株式会社 Input interface device

Citations (2)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JP2648514B2 (en) 1997-09-03

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