TW201006656A

TW201006656A - Mold clamping device

Info

Publication number: TW201006656A
Application number: TW098111474A
Authority: TW
Inventors: Atsushi Kato; Hiroshi Morita; Tatsuya Shibata; Taizo Yamamoto
Original assignee: Sumitomo Heavy Industries
Priority date: 2008-04-08
Filing date: 2009-04-07
Publication date: 2010-02-16
Also published as: WO2009125732A1; CN101977745A; JP5340625B2; JP2009248476A; DE112009000809T5; TWI393623B; CN101977745B

Abstract

A mold clamping device for opening and closing a mold by a three-phase AC linear motor. The mold clamping device comprises a temperature monitoring means for monitoring the temperature of a coil for a phase most making a contribution over the acceleration of the motor during the mold feeding among the coils for three phases of the linear motor. Consequently, a defect due to the rise of the temperature of the coils of the linear motor can be properly prevented from occurring.

Description

201006656 六、發明說明：【發明所屬之技術領域】本發明係有關於-種鎖模裝置，特別是有關於一種由三相交流型的線型馬達進行模具開閉動作的鎖模裝置。【先前技術】 ’樹脂從射出裝置的動模具之間的模穴空配置鎖模裝置而使可[Technical Field] The present invention relates to a type of mold clamping device, and more particularly to a mold clamping device that performs a mold opening and closing operation by a three-phase AC type linear motor. [Prior Art] 'Resin is provided by a cavity clamping device between the movable molds of the injection device.

間between

在習知技術中，在射出成形機中出喷嘴射出而填充於固定模具與可 ’使其固化而得到成形品。然後，動模具相對於上述固定模具移動而進行閉模、鎖模及開模。在該鎖模裝置中，有藉由供給油至油壓缸而驅動的油壓式的鎖模裝置以及由電動機驅動的電動式的鎖模裝置，該電動式的鎖模裝置由於控制性高、不會污染周邊且能源效率高，因此利用較多。此時，#由驅動電動機使滾珠螺In the prior art, a nozzle is ejected in an injection molding machine to be filled in a fixed mold and can be solidified to obtain a molded article. Then, the movable mold is moved relative to the fixed mold to perform mold closing, mold clamping, and mold opening. In the mold clamping device, there is a hydraulic type clamping device driven by supplying oil to the hydraulic cylinder and an electric clamping device driven by an electric motor. The electric clamping device has high controllability. It does not pollute the surrounding area and is energy efficient, so it is used more. At this time, # is driven by the motor to make the ball screw

桿旋轉而產生推力，該推力由肘節機構放大，而產生大的鎖模力（例如，專利文獻1 )。因此，在上述構造的電動式的鎖模裝置中，由於使用肘節機構，該財節機構的特性上，改變鎖模力是困難的，反應性及穩定性差，在成形中無法控制鎖模力。於此，提供一種鎖模裝置，由滾珠螺桿所產生的推力做為直接鎖模力而使用。此時，由於電動機的扭力與鎖模力成正比可控制成形中的鎖模力。然而’在習知的缜模裝置中，滾珠螺桿的耐荷重性降低，不僅無法產生大的鎖模力，由於產生於電動機的扭力 201006656 漣波（torque ripple)，使鎖模力產生變動。又，為了產生鎖模力’必須經常供給電流至電動機，由於電動機的銷耗電力及發熱量多，電動機的額定輸出變大，會提高鎖模裝置的成本。於此’在開閉模動作中使用線型馬達，在鎖模動作中檢討利用電磁鐵的吸附力的鎖模裝置（例如，專利文獻2 )。在該鎖模裝置中，從成形循環的效率化等的觀點，模具開閉時（模具移送時）的線型馬達的最佳速度圖形為在加速區間以最大加速度加速’之後’以等速度移動，在減速區間以最大檢速度減速，在模具關閉位置停止。在鎖模裝置的線型馬達中’根據該速度圖案正確地控制模具開閉動作，對應於成形循環而反覆進行。 [專利文獻1] 國際公開第06/098321號公報 [專利文獻2] 國際公開第05/090052號公報【發明内容】 [發明所欲解決的問題] 因此，供給至三相交流型的線型馬達的各相的電流視線型馬達的位置而異。又’如上所述，線型馬達的動作圖案每次正確地被控制。而且’線型馬達的加速區域及減速區域的距離一般而言比線型馬達的磁極對間距還短。因此’在鎖模裝置的線型馬達中，在加速區間及減速區間中，供給大的電流的相是固定的。結果，供給大電流的相的線圈的溫度異常地上升，可能導致線圈的破損。 201006656 而且，在用於肘節機構的鎖模裝置的旋轉式馬達的情況下’由於磁極間距相對於加速區間及減速區間的距離非常短’特定的相的溫度異常上升的可能性降低。有鑑於此’本發明的目的在於提供一種鎖模裝 4 適當地防止線型馬達的線圈的溫度異常的上升。 [解決問題的手段] 為了解決上述問題，本發明的鎖模裝置由三相交流型 _ 的線型馬達進行開閉模動作，並具有溫度監視裝置，監視在上述線型馬達的三相的個別的線圈中，對於模具移送時的加速度最有幫助的線圈的溫度。又，本發明的特徵為上述線型馬達的永久磁鐵的磁極對的間距比從模具移送的開始位置至加速度的峰值位距離長。又，本發明的特徵為上述磁極對間距比模具移送的加速區間的距離及模具移送的減速區間的距離的至少其中之 • 一還長。又，本發明的特徵為對應於由上述溫度監視裝置所監視的溫度而使模具的移送停止。又，本發明更包括一溫度檢測裝置對於上述線型馬達的三相的全部的線圈，檢測出該線圈的溫度。又本發明的特徵為上述溫度監視裝置係根據上述溫 X檢測裝置的檢測值，而檢測所選出的相的線圈的溫度。 [發明的效果] 據本發明，其於提供一種鎖模裝置，可適當地防止 201006656 線型馬達的線圈的溫度異常的上升。【實施方式】參照圖式對本發明的實施形態做說明。首先，參照第 1圖及第2圖說明本發明所適用的射出成形機的鎖模裝置。第1圖為第一實施形態的模具裝置及鎖模裴置的閉模時的狀態的侧視圖。第2圖為第一實施形態中模具裝置及鎖模裝置的開模時的狀態的側視圖。第1圖及第2圖的鎖模裝置1〇係支持於設於射出成形機的框架Fr上的二根軌道所形成的導件（jd上。固定板11 係載置於導件Gd上’對應於框架Fr及導件Gd而固定。與固定板11以既定間隔配置，且與固定板i i相向而配置做為電磁鐵保持構件的後板13。固定板u與後板13之間架設有四根做為連結構件的連桿14 (圖中僅表示二根）。可動板12在與固定板丨丨相向的狀態下，沿著連桿丨4於開閉模方向上可進退地配置（圖中於左右方向可移動）。因此，在可動板12上形成連桿14貫穿的導孔（未圖示）。而且，在本說明書中，模具開閉方向，即移動版Μ的移動方向稱為水平方向，垂直於可動板12的移動垂直方向。科馬在連桿14的前端部（圖中的右端部）形成第—螺紋告 (未圖不）’連桿14藉由使螺帽〇1螺合於第一螺二合而固定於固定板i…外徑比連桿“小的導柱21二-成形於各連桿14的後端部（圖巾的左端部）。導挺21韻 201006656 後板13的後端面（圖中的左端面）向後方突出而延伸。各導柱21的後板13的後端面的附近，形成第二螺紋部（未圖不），固定板11與後板13藉由螺帽n2螺合於第二螺紋部而連結固定。雖然導柱21與連桿14 一體成形，但導柱 21與連桿14不同個體形成亦可。固定模具15與可動模具16分別固定於固定板Η與可動板12上。由固定模具15及可動模具“而構成模具裝置 φ 19。藉由可動板12的進退，可動模具“相對於固定模具 15移動’進行閉模、鎖模及開模。而且，當進行鎖模時，在固定模具15與可動模具16之間形成模穴，從射出裝置 Π的射出噴嘴18射出的做為成形材料的樹脂填充於模穴與可動板12平行配置而由磁性體所形成的吸附板U 從後板13在後方沿著導柱21可進退地配置，由導柱引。、而且，在吸附板22上，在與各導柱21對應的位置上，形成供導柱21貫穿的導孔23。導、守札U包含開口於前端面 (圖中右端面）的大直徑部24 及興大直牷部24連接的小直徑部25。大直徑部24容納作W小直徑部25開口於吸附板22的後端面，並具有供 ^ τ ^ ^ . 1 〇等柱21滑動的滑動面。為了使可動板12進退，做為模1 〗用的驅動部的線刮民達28配置於連結於可動板12 ·、、、及附板22與框架線型馬達28包括配置於框架、曰、上、與導件Gd平行且掛庵於吸附板22的移動範圍配置的于應附板22下端的滑動基座Sb 以及固定於固定吸興疋子31相向且跨越既定範 201006656 圍而形成的動子29。滑動基座Sb，如第2圖所示，在其兩側支持於導件Gd上，動子29沿著定子31可移動地被支持。滑動基座Sb覆蓋動子29的上面，並延伸於導件的延伸方向。因此，在後板13的下端，形成供導件基座Gb 及滑動基座Sb通過的空間81的腳部13a設於兩侧。定子31朝動子29突出，且以既定的間距形成多個磁極齒33的芯材34以及捲繞於各磁極齒33的線圈35。而且，磁極齒33相對於可動板12的移動方向呈直角方向，彼此平行地形成。其具有對應於動子29及導件基座Gb而以既定間隔配置的永久磁鐵（未圖示）。因此，將既定的電流供給至線圈35而驅動線型馬達 28時，使動子29進退。隨此，藉由滑動基座，使固定於滑動基座Sb的吸附板22以及由桿39使連結於吸附板22 的可動板12進退’而進行開模及閉模。當可動板12前進（圖中於右方向移動）而可動模具 16抵接於固定模具15時，結束閉模。在閉模之後進行鎖模，在後板13與吸附板22之間配置有做為鎖模用的驅動部的電磁鐵單元37。又，連結可動板12與吸附板。的桿 39係貫穿後板13及吸附板22而延伸。桿39在閉模及開模時，連動於吸附板22的進退而使可動板12進退，在鎖模時’由電磁鐵37所產生的鎖模力傳遞至可動板12。而且，由框架Fr、固定板11、可動板12、後板13、吸附板 22、線型馬達28、電磁鐵單元37、桿39等構成鎖模裝置 10 ° 201006656 電磁鐵單元37具有配置於後板η侧的電磁鐵4g以及配置於吸附板22側的吸附部51。後板13的後端面的既定邛匀，即在桿39的稍微上方及下方，於水平方向延伸的矩形的剖面形狀的做為線圈配置部的二條槽45彼此平行地形成。在槽45之間形成具有矩形的斷面形狀的芯材46, 後板的4材46以外的部分形成軛47。線圈48捲繞於芯材 46上。 φ 又，吸附板22的其端面的既定部分，在吸附板22上包圍桿39，與電磁鐵49相向的部分設置吸附部51。而且，後板13的芯材46、輛47及吸附板22由強磁性體所構成的薄板堆積所成的電磁層積鋼板所形成。又，雖然後板13 與電磁鐵49分別配置，吸附板22與吸附部51分別配置，後板13的一部份形成電磁鐵，吸附板22的一部份形成吸附部。又，不一定要使用電磁層積鋼板，使用相同構件所構成的鐵芯而形成芯材46及輛47亦可。此時，間距間的籲距離可精密地設定。因此，在電磁鐵單元37中，當電流供給至槽45内的線圈48時，電磁鐵49被激磁’吸附部51被吸附而產生鎖模力。桿39在後端部（圖中左端部）與吸附板22連結，在前端部與可動板12連結。桿39在閉模時藉由吸附板22前進而前進，藉此可動板12前進。又，桿39在開模時藉由吸附板22後退（在圖中於左方向移動）而後退，藉此可動板12後退。 9 201006656 因此’在後板13的中央部分設有供桿39貫穿的孔41。又’在吸附板22的中央部分形成供桿39貫穿的孔42。而且，面向孔41的前端部的開口，配置有可滑動地支持桿 39的套筒等的軸承構件Br卜又，在桿”的後端部形成螺紋43相對於吸附板22而可旋轉地支持的做為模厚調整機構的螺帽44螺合於螺紋43。在閉模結束的時間點上，吸附板22靠近後板13，在後板13與吸附板22之間形成間隙3。當間隙占變小或變大時，吸附部51無法充分地吸附，鎖模力變小。間隙^ 的最適當值（距離或尺寸）係隨著模具裝置19的厚度變化而變化。於此，在螺帽44的外周面形成大直徑的齒輪（未圖示），在吸附板22上配置做為模厚調整用的驅動部的模厚調整用馬未圖示），安裝於模厚調整用馬達的輸出轴的小直徑的齒輪嚙合於形成於螺帽44的外周面的齒輪。對應於模具裝置19的厚度，驅動模厚調整用馬達當做為模厚調整機構的螺帽44相對於螺紋43做既定量的旋轉時，調整桿39相對於吸附板22的位置，而調整吸附板 Μ相對於固定板u及可動板12的位置，而使間隙占成為最適當的值。即，藉由改變可動板12與吸附板22的相對位置，而進行模厚的調整。該模厚的調整為粗調整隨著模厚的變化的間隙占的距離，例如做0. lffim單位的微調整係由變更吸附板22在滑動基座Sb上的位置或變更後板13在導件Gd上的位置而進 201006656 行。在鎖模裝置10上，吸附板22係安裝於從滑動基座讥垂直豎立而安裝的安裝板27,藉由調整夾入吸附板22與安裝板27之間的墊片的厚度，而微調整間隙占的距離。而且，安裝板27具有肋27a，即使鎖模力的反作用力作用於安裝板27上，安裝板27的安裝面也不會傾倒而維持其垂直度。又，為了保持電磁鐵與吸附板的平行度，最好夹入與 • 電磁鐵或吸附板的面整髏相同大小的墊片，但難以使用與這種尺寸相同厚度的墊片。於此，例如在大略四邊形的吸附板的四個角落附近以螺栓結合時，只在結合的四個位置附近夹入小的墊片。此時，在未夾入墊片的部分形成間隙，使吸附板變形而平面度變差，會產生相對於基座的平行度變差的問題。 & 而且，由模厚調整用馬達、齒輪、螺帽44及桿39等構成模厚調整裝置。又，由齒輪構成將模厚調整用馬達的旋轉傳遞至螺帽44的旋轉傳遞部。然後，由螺帽扨及螺紋43構成運動方向變換部，在運動方向變換部中，螺帽 44的旋轉運動轉換成桿39的直進運動。、鎖杈裝置10的線型馬達28及電磁鐵49的驅動係由控制部60所控制。控制部6〇具有CPU及記憶體等，也具有對應於cpu演算的結果，將電流供給至線型馬達28的線圈 =與電磁鐵49的線圈48的電路。控制部6〇也做為溫度監視裝置’與配置於線型馬達28的做為溫度檢測裝置的熱敏電阻（溫度感測器）連接。而且，控制部⑼在第2圖為 11 201006656 了方便而省略。第3圖表示熱敏電阻與控制部的關係。在同一圖中，線型馬達28中的動子29與定子31被放大表示。在同一圖中，與第1圖或第2圖相同的部分給予、相同的符號，而適當地省略其說明。 # 在第3圖中，三個熱敏電阻62u、62v及62wr (以下總稱為「熱敏電阻62」），分別配置成可檢測U相的線圈35、 V相的線圈35以及w相的線圈35w的溫度。即，對於三相的線圈全部配置熱敏電阻62。控制部60、經由切換器61連接於熱敏電阻62。在連接於控制部60之前，切換器61切換至從三相中選擇做為監視對象的相所對應的敎傲雷阳^ 9 刃…敏電阻62。控制部60監視由切換器以連接的熱敏電阻62所檢測出的溫度，對應於該溫度而進行後述的控制。切換器61所進行的連接前的切換可由控制部60自動地執行，也可手 _ 亍動地執仃。在後者（手動）參的情況下，切換器61可為理論性的元件。即，不經由切換 =可直接地連接控制部6。與對應於做為監視對象的相的熱敏電阻6^而且，切換關構成。例如可由-般性的開哪一相成為監視對象係根攄右且叙你，獻丄艨在冽嘁性地進行的開閉模擇。即，在該模具開閉動作中的檢測值而選所檢測出的溫度。結果，將檢測二=的熱敏電阻62 (溫度）選擇做為監視對象。4度的㈣電阻62 12 201006656 那麼，在第3圖中，永久磁鐵32 極與3極的各磁極交互地等間隔地配置於動子29上。於此，同極的永久磁石的間隔稱為「磁極對間距」。在同一圖中，以磁極對間距2P表不。因此，各永久磁鐵32之間的間隔為「磁極對間距2P+2」。在同一圖中，又，表示了在鎖模裝置1〇的模具開閉時 (模具移送時）的加減速距離L。加減速距離l稱為模具 _ 移送時，被加速的區間（加速區間）的距離（從模具移送開始至等速狀態的距離），或被減速的區間（減速區間）的距離（（從等速狀態至停止狀態的距離）。而且，圖示的加減速距離L是為了表示與磁極對間距2P的相對關係而記載的長度，並非表示加減速距離L的絕對區間（位置）。 P在圖中，磁極對2P表示成比加減速距離（加速區間的距離及減速區間的距離的至少其中之一）還長。在該線型馬達28中，傾向於加減速時的電流供給係集中於特疋的相。結果，該特定的相的溫度可能比其他相高得多。特別是，在射出成形機的鎖模裝置中，在量產成形中，由於開模位置及閉模位置係由成形條件決定，線型馬達28在同一區間中反覆加減速。此時，電流集中在特定相中流動的可能性變高。於此，在本實施形態中，測試性地進行的模具開閉動作之際所檢測出的最高溫度的熱敏電阻62(的溫度）被選擇做為監視對象。藉此’可防止異常的檢測的遺漏。即，當任意地選擇監視對象時’選擇上述特定的相以外的相做 13 201006656 為監視對象異常地升高述情事。結果雖然可能無法檢測出該但是以本實施形態的監視方特定的相的溫度法·是不會發生上又’根據本實施形態的監視方法，通常運用時，由於僅一個相（上述特定的相）《為監視對象，與全部的相成為監視對象的情況相比，可減低與溫度監視有關的成本。連接控制部6G與熱敏電阻62的設施或機器等可僅對應於上述特定的相設置。而且，加減速距離L並不限定於加速度完全為〇的距離。其速度圖形可假定為在模具移送開始之後以大的加速度加速，之後以小的加速度加速，在此種速度圖形中，加減速距離L的概念是包含從模具移送的開始位置到加速度降低的距離或從模具移送的開始位置到達加速度的峰值的距離。接著’參照第4圖說明鎖模裝置1〇的動作。第4圖為使用於模具開閉動作的線型馬達的動作圖形的例子的圖。在同一圖中’（A)表示線型馬達28的動子29的位置與速度的關係’⑷表示線型馬達28的動子29的位置與、加速度的關係’（C)表示線型馬達28的動子29的位置與供給至線型馬達28的線圈35的電流值的關係，（D)為線型馬達28的動子的位置與線型馬達28的三相U相：中心線’ V相：實線，w ；{：日.忐綠、u Vro W相.虛線）的個別線圈35的電流的相位的例子。而且，右r Λ、在（Α)、（Β)、（C)及（D)中，構轴（位置）是一致的。、 201006656 在第2圖所示的狀態中，控制部6〇供給電流至線圈 35。藉此，線型馬達28被驅動，吸附板。與可動板12一起前進。控制部60在加速區間中將用於得到最大加速度的電流供給至線圈35。因此，線型馬達28的動子29在加速區間中由最大加速度加速。此時，對於u相的線圈35施加對應於開模位置的電流值Ua。同樣地，對v相的線圈託施加電流值Va，對W相施加電流值Wa。施加於？相的電流 • 值骷如圖般的微小。之後，當如（A)所示的加速持續時，可動板12的開模速度依次地增加。然後，如（D)所示，流動於u相的電流值也增加。一方面，流動於v相的電流慢慢地接近0[Α]。在此情況下，加速時流入υ相的電流最多’ ϋ相的發熱量與其他相相比也變大。當線型馬達28的位置超過加速區間時，控制部6〇使電流的供給量降低。結果，線型馬達28以等速移動。接著，當線型馬達28的動子.29到達減速區間的開始 •位i時’控制部60將用於得到最大減速度的電流（與加速區間相反的電流）供給至線圈35。此時’對u相的線圈35 施加對應於減速開始位置的電流值Ub。同樣地，對V相的線圈35施加電流值vb，對相施加電流值Wb。施加於v 相的電流值Vb，如圖般的微小。之後，當如（A)所示的減速持續時，可動板12的閉模速度依次地減少。然後，如 (D)所示，流動於u相的電流值也增加。一方面，流動於 W相的電流慢慢地接近〇[Α]。在此情況下，減速時流入υ 相的電流最多，ϋ相的發熱量與其他相相比也變大。之後， 15 201006656 線型馬達28的動子29以最大減速度減速，而停止於閉模位置。停止時的各相的電流值為Uc、Vc、Wc。接著’控制部60係供給電流於線圈48。藉此，磁性體的及附板22的吸附部51由電磁鐵49的吸附力所吸附。結果’經由吸附板22及桿39將吸附力做為鎖模力而傳遞至可動板12，進行鎖模。又’控制部60以鎖模力做為目標設定值而決定供給至線圈48的電流值’藉由將該電流供給至線圏48而控制鎖模。在進行鎖模的期間，在射出裝置17中，熔融的樹脂從射出喷嘴18射出’而填充於模具裝置19的模穴中。當模穴空間内的樹脂固化時，在第丨圖所示的狀態中控制°卩6 0停止對線圈4 8供給電流。此時，即使停止電机至線圈4 8 ,由於磁氣殘留於吸附部51，當對線圈 =進行鎖模之際，朝反方向供給電流，而除去殘留於吸附邛51的磁氧。接著，控制部60在閉模時供給反方向的電 '圈5此時，電流係對應於閉模位置的電流值（uc (參照D))愈丄 /、上下相反的波形而施加電流至11相的線圈線型馬達28被驅動，使可動板12後退，如第 2圖所示，可岛指曰 J動模具16移動至後退極限位置，進行開模。此為即使在開模動作中，由於波形⑻為上下對稱，進入目’電流量最多，U相的發熱量比其他部60在開模時， &便控制達28。根據與閉模時相同的速度圖形控制線型馬 201006656 如上所述，在閉模時及開模時（模具移送時），控制部60也一併地實施以下的處理。第5圖為說明模具移送時由控制部實施的處理順序的圖。在步驟S101中，控制部60藉由經切換器61而連接的熱敏電阻62 (即，對應於做為預先監視的對象而選擇的相的熱敏電阻62)而接受檢測值（線圈35的檢測溫度）的輸入。根據第4D圖，在本實施形態中，在加速區間中供給 • 最大的電流的是U相。因此，由U相的熱敏電阻62u輸入檢測溫度。接著，控制部60算出從初期狀態起的上升溫度 (S102)。所謂初期狀態是指電流供給至線圏35前的狀態。即，控制部60保持初期狀態的檢測溫度（初期溫度）。從步驟S101中輸入的檢測溫度減去初期溫度而算出上升溫度。接著，控制部60判定是否超過預先設定上升溫度的門檻值（S103)。而且，步驟sl〇1〜sl〇3在模具移送時反覆進行。在上升溫度超過門檻值的情況下（在S103中為 Yes) ’控制部6〇停止線型馬達28的模具移送（sl〇4)。而且’在第5圖中’雖然將上升溫度與門檻值做比較的例子做說明’但將檢測温度與門檻值比較亦可。如上所述’根據本實施形態的鎖模裝置10，由於在三相中選擇為了得到加速度而供給最大電流的相（即’對加速度最有貝獻的相），可適當地防止由線圈35的發熱所造成的異常狀況。 17 201006656 、*二：，在加速區間與減速區間中，即使在供給最多電度最：的情況下，測試性的開閉模動作之際所檢測出之二：尚的相成為監視對象…測試性的開閉模動作 75測出的溫度最高的相為兩個的情況下，可選擇其中任何-相成為監視對象。在任—種情況下，的溫度。间 u上雖然針對本發明的實施例做詳細說明但本發明並不限於特定的實施形態’在申請專利範圍所記載的本發明的要旨的範圍内，可做各種的變形、變更❶ 鬱本案的國際申請案係根據2008年4月8日提申的曰本專利申請案2008-100266號而主張優先權，2〇〇8_1〇〇266 號的全部内容係援用於本國際申請案。【圖式簡單說明】第1圖為本發明的實施形態的模具裝置及鎖模裝置的閉模時的狀態的側視圖。第2圖為本發明的實施形態的模具裝置及鎖模裝置的開模時的狀態的側視圖。第3圖為熱敏電阻與控制部的關係的圖。第4圖（A)〜（D)為使用於模具開閉動作的線型馬達的動作圖案的例子的圖。第5圖為在模具移送時說明由控制部實施的處理順序的圖。 18 201006656 【主要元件符號說明】The lever rotates to generate a thrust which is amplified by the toggle mechanism to generate a large clamping force (for example, Patent Document 1). Therefore, in the above-described electric type clamping device, since the toggle mechanism is used, it is difficult to change the clamping force in the characteristics of the financial mechanism, and the reactivity and stability are poor, and the clamping force cannot be controlled during the forming. . Here, a mold clamping device is provided in which the thrust generated by the ball screw is used as a direct clamping force. At this time, since the torque of the motor is proportional to the clamping force, the clamping force in the forming can be controlled. However, in the conventional stencil apparatus, the load resistance of the ball screw is lowered, and not only a large clamping force cannot be generated, but also a torque generated by the motor 201006656 to cause a change in the clamping force. Further, in order to generate the clamping force, it is necessary to constantly supply a current to the motor. Since the power consumption and the amount of heat generated by the motor are large, the rated output of the motor becomes large, which increases the cost of the mold clamping device. Here, a linear motor is used for the opening and closing operation, and a mold clamping device using the adsorption force of the electromagnet is examined during the mold clamping operation (for example, Patent Document 2). In the mold clamping device, from the viewpoint of the efficiency of the molding cycle, etc., the optimum speed pattern of the linear motor at the time of mold opening and closing (at the time of mold transfer) is accelerated at the maximum acceleration in the acceleration section, and then moves at a constant speed. The deceleration zone decelerates at the maximum inspection speed and stops at the mold closing position. In the linear motor of the mold clamping device, the mold opening and closing operation is accurately controlled in accordance with the speed pattern, and is repeated in response to the forming cycle. [Patent Document 1] International Publication No. 06/098321 [Patent Document 2] International Publication No. 05/090052 [Disclosure] [Problems to be Solved by the Invention] Therefore, it is supplied to a three-phase AC type linear motor. The current of each phase varies depending on the position of the line-of-sight motor. Further, as described above, the motion pattern of the linear motor is correctly controlled each time. Moreover, the distance between the acceleration region and the deceleration region of the linear motor is generally shorter than the magnetic pole pair pitch of the linear motor. Therefore, in the linear motor of the mold clamping device, the phase for supplying a large current is fixed in the acceleration section and the deceleration section. As a result, the temperature of the coil supplying the phase of the large current abnormally rises, possibly causing breakage of the coil. 201006656 Further, in the case of a rotary motor for a mold clamping device of a toggle mechanism, the magnetic pole pitch is extremely short with respect to the acceleration interval and the deceleration interval, and the temperature of the specific phase is abnormally lowered. In view of the above, it is an object of the present invention to provide a mold clamping device 4 which suitably prevents an abnormal rise in temperature of a coil of a linear motor. [Means for Solving the Problems] In order to solve the above problems, the mold clamping device of the present invention is opened and closed by a linear motor of a three-phase AC type, and has a temperature monitoring device that monitors the individual coils of the three phases of the linear motor. The temperature of the coil that is most helpful for the acceleration of the mold transfer. Further, the present invention is characterized in that the pitch of the magnetic pole pairs of the permanent magnets of the above-described linear motor is longer than the distance from the start position of the mold transfer to the peak position of the acceleration. Further, the present invention is characterized in that the magnetic pole pair pitch is longer than at least one of the distance between the acceleration section of the mold transfer and the speed of the speed reduction section of the mold transfer. Further, the present invention is characterized in that the transfer of the mold is stopped in accordance with the temperature monitored by the temperature monitoring device. Further, the present invention further includes a temperature detecting means for detecting the temperature of the coil for all of the three phases of the linear motor. Still another feature of the present invention is that the temperature monitoring device detects the temperature of the coil of the selected phase based on the detected value of the temperature X detecting device. [Effects of the Invention] According to the present invention, it is possible to appropriately prevent the temperature of the coil of the 201006656 linear motor from rising abnormally by providing a mold clamping device. [Embodiment] An embodiment of the present invention will be described with reference to the drawings. First, a mold clamping device of an injection molding machine to which the present invention is applied will be described with reference to Figs. 1 and 2 . Fig. 1 is a side view showing a state in which the mold apparatus and the mold clamping device of the first embodiment are closed. Fig. 2 is a side view showing a state in which the mold device and the mold clamping device are opened at the time of the first embodiment. The mold clamping device 1 of Fig. 1 and Fig. 2 is supported by a guide (jd formed on two rails provided on the frame Fr of the injection molding machine. The fixing plate 11 is placed on the guide Gd] It is fixed corresponding to the frame Fr and the guide Gd. The fixed plate 11 is disposed at a predetermined interval, and the rear plate 13 as an electromagnet holding member is disposed opposite to the fixed plate ii. The fixed plate u and the rear plate 13 are disposed between each other. Four connecting rods 14 as connecting members (only two are shown in the figure). The movable plate 12 is disposed to advance and retreat along the connecting rod 于4 in the direction of the opening and closing mold in a state of being opposed to the fixed plate ( (Fig. The middle portion is movable in the left-right direction. Therefore, a guide hole (not shown) through which the link 14 is inserted is formed in the movable plate 12. Further, in the present specification, the mold opening and closing direction, that is, the moving direction of the moving plate is called horizontal. The direction is perpendicular to the vertical direction of the movement of the movable plate 12. The Koma is formed at the front end portion (the right end portion in the drawing) of the link 14 to form a first thread (not shown). The link 14 is screwed by the nut 〇1. Combined with the first screw combination and fixed to the fixed plate i... the outer diameter is smaller than the connecting rod "small guide column 21 - The rear end portion of each of the links 14 is formed at the rear end portion (the left end portion of the towel). The rear end surface (the left end surface in the drawing) of the rear plate 13 extends rearward and extends. The rear plate 13 of each guide post 21 is formed. A second threaded portion (not shown) is formed in the vicinity of the rear end surface, and the fixing plate 11 and the rear plate 13 are coupled and fixed by screwing the nut n2 to the second threaded portion. Although the guide post 21 is integrally formed with the connecting rod 14 However, the guide post 21 may be formed separately from the connecting rod 14. The fixed mold 15 and the movable mold 16 are respectively fixed to the fixed plate Η and the movable plate 12. The fixed mold 15 and the movable mold "constitute the mold device φ 19. When the movable plate 12 advances and retracts, the movable mold "moves relative to the fixed mold 15" to perform mold closing, mold clamping, and mold opening. Further, when the mold is locked, a cavity is formed between the fixed mold 15 and the movable mold 16 from the mold. The resin which is a molding material which is emitted from the injection nozzle 18 of the injection device is filled in the cavity and is disposed in parallel with the movable plate 12, and the adsorption plate U formed of the magnetic material is disposed forward and backward along the guide post 21 from the rear plate 13 , guided by the guide column, and, on the adsorption plate 22 A guide hole 23 through which the guide post 21 is inserted is formed at a position corresponding to each of the guide posts 21. The guide and the guard U include a large diameter portion 24 that opens to the front end surface (the right end surface in the drawing) and a large straight portion 24 The small-diameter portion 25 is connected. The large-diameter portion 24 is accommodated as a small-diameter portion 25 that opens to the rear end surface of the adsorption plate 22, and has a sliding surface for sliding the column 21 such as τ ^ ^ 1 〇. For the movable plate 12 The wire squeezing 28 of the driving portion for the modulo 1 is disposed to be coupled to the movable plate 12, and the attachment plate 22 and the frame line motor 28 are disposed on the frame, the cymbal, the upper portion, and the guide member Gd. The sliding base Sb disposed at the lower end of the attachment plate 22 disposed in parallel with the moving range of the adsorption plate 22 and the mover 29 fixed to the fixed suction tweezers 31 and extending across the predetermined range 201006656. The slide base Sb, as shown in Fig. 2, is supported on the guide Gd on both sides thereof, and the mover 29 is movably supported along the stator 31. The slide base Sb covers the upper surface of the mover 29 and extends in the extending direction of the guide. Therefore, at the lower end of the rear plate 13, the leg portions 13a forming the space 81 through which the guide base Gb and the slide base Sb pass are provided on both sides. The stator 31 protrudes toward the mover 29, and a core material 34 of a plurality of magnetic pole teeth 33 and a coil 35 wound around each magnetic pole tooth 33 are formed at a predetermined pitch. Further, the magnetic pole teeth 33 are formed in a direction perpendicular to the moving direction of the movable plate 12, and are formed in parallel with each other. It has permanent magnets (not shown) arranged at predetermined intervals in accordance with the mover 29 and the guide base Gb. Therefore, when a predetermined current is supplied to the coil 35 to drive the linear motor 28, the mover 29 is advanced and retracted. As a result, the suction plate 22 fixed to the slide base Sb and the movable plate 12 coupled to the suction plate 22 are advanced and retracted by the slide base to perform mold opening and closing. When the movable plate 12 advances (moving in the right direction in the drawing) and the movable mold 16 abuts against the fixed mold 15, the mold closing is ended. After the mold is closed, the mold is locked, and an electromagnet unit 37 as a driving portion for mold clamping is disposed between the rear plate 13 and the suction plate 22. Further, the movable plate 12 and the adsorption plate are coupled. The rod 39 extends through the rear plate 13 and the suction plate 22. When the rod 39 is closed and opened, the movable plate 12 is moved forward and backward in conjunction with the advancement and retraction of the suction plate 22, and the clamping force generated by the electromagnet 37 is transmitted to the movable plate 12 during the mold locking. Further, the frame Fr, the fixed plate 11, the movable plate 12, the rear plate 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the rod 39, and the like constitute a mold clamping device. 10 ° 201006656 The electromagnet unit 37 has a rear plate disposed on the rear plate. The electromagnet 4g on the n side and the adsorption portion 51 disposed on the side of the adsorption plate 22 are provided. The predetermined rear surface of the rear plate 13 is formed such that the two grooves 45 which are the coil arrangement portions which are formed in the horizontal direction and which are slightly above and below the rod 39 are formed in parallel with each other. A core material 46 having a rectangular cross-sectional shape is formed between the grooves 45, and a portion other than the four members 46 of the rear plate forms a yoke 47. The coil 48 is wound around the core member 46. Further, a predetermined portion of the end surface of the adsorption plate 22 surrounds the rod 39 on the adsorption plate 22, and the adsorption portion 51 is provided at a portion facing the electromagnet 49. Further, the core material 46, the vehicle 47, and the suction plate 22 of the rear plate 13 are formed of an electromagnetic laminated steel sheet formed by stacking thin plates made of a ferromagnetic material. Further, the rear plate 13 and the electromagnet 49 are disposed separately, and the adsorption plate 22 and the adsorption portion 51 are disposed separately, and a part of the rear plate 13 forms an electromagnet, and a part of the adsorption plate 22 forms an adsorption portion. Further, it is not necessary to use an electromagnetic laminated steel sheet, and it is also possible to form the core material 46 and the vehicle 47 by using an iron core formed of the same member. At this time, the distance between the pitches can be precisely set. Therefore, in the electromagnet unit 37, when a current is supplied to the coil 48 in the groove 45, the electromagnet 49 is excited by the adsorption portion 51 to be attracted to generate a clamping force. The rod 39 is coupled to the suction plate 22 at the rear end portion (left end portion in the drawing), and is coupled to the movable plate 12 at the front end portion. The rod 39 is advanced by the suction plate 22 at the time of mold closing, whereby the movable plate 12 advances. Further, the rod 39 is retracted by the suction plate 22 retreating (moving in the left direction in the drawing) at the time of mold opening, whereby the movable plate 12 is retracted. 9 201006656 Therefore, a hole 41 through which the rod 39 is inserted is provided in the central portion of the rear plate 13. Further, a hole 42 through which the rod 39 is inserted is formed in the central portion of the suction plate 22. Further, a bearing member Br such as a sleeve that slidably supports the rod 39 is disposed to face the opening of the front end portion of the hole 41. Further, a thread 43 is formed at the rear end portion of the rod to rotatably support the suction plate 22. The nut 44 as the mold thickness adjusting mechanism is screwed to the thread 43. At the time point when the mold closing is completed, the suction plate 22 is close to the rear plate 13, and a gap 3 is formed between the rear plate 13 and the suction plate 22. When the shrinkage is small or large, the adsorption portion 51 is not sufficiently adsorbed, and the mold clamping force is small. The optimum value (distance or size) of the gap ^ varies depending on the thickness of the mold device 19. Here, the snail is changed. A large-diameter gear (not shown) is formed on the outer peripheral surface of the cap 44, and a mold thickness adjustment motor (not shown) for arranging the drive portion for mold thickness adjustment is attached to the mold thickness adjustment motor. The small-diameter gear of the output shaft meshes with the gear formed on the outer peripheral surface of the nut 44. Corresponding to the thickness of the mold device 19, the motor for driving the mold thickness adjustment is defined as the nut 44 of the mold thickness adjusting mechanism with respect to the thread 43. When the amount is rotated, the adjustment rod 39 is opposed to the adsorption The position of the plate 22 is adjusted to adjust the position of the suction plate Μ relative to the fixed plate u and the movable plate 12, so that the gap occupies the most appropriate value, that is, by changing the relative positions of the movable plate 12 and the suction plate 22. Adjustment of the die thickness. The adjustment of the die thickness is a rough adjustment of the distance occupied by the gap of the die thickness. For example, the micro-adjustment of the lffim unit is changed by changing the position or change of the adsorption plate 22 on the sliding base Sb. The position of the rear plate 13 on the guide Gd is proceeded to 201006656. On the clamping device 10, the suction plate 22 is attached to the mounting plate 27 which is vertically erected from the sliding base, and is clamped into the suction plate 22 by adjustment. The thickness of the spacer between the mounting plate 27 and the minor adjustment gap. Moreover, the mounting plate 27 has the rib 27a, and even if the reaction force of the clamping force acts on the mounting plate 27, the mounting surface of the mounting plate 27 is also In order to maintain the parallelism of the electromagnet and the adsorption plate, it is preferable to sandwich a gasket of the same size as the surface of the electromagnet or the adsorption plate, but it is difficult to use and size. a gasket of the same thickness. Here, an example For example, when bolts are combined near the four corners of the substantially quadrilateral adsorption plate, only a small gasket is sandwiched near the four positions of the joint. At this time, a gap is formed in the portion where the gasket is not sandwiched, and the adsorption plate is deformed. However, the flatness is deteriorated, and the parallelism with respect to the susceptor is deteriorated. Further, the mold thickness adjusting motor, the gear, the nut 44, the rod 39, and the like constitute a mold thickness adjusting device. The rotation transmitting portion that transmits the rotation of the mold thickness adjusting motor to the nut 44 is configured. Then, the nut direction and the thread 43 constitute a movement direction changing portion, and in the movement direction changing portion, the rotation motion of the nut 44 is converted into a rod. The linear motion of 39. The drive of the linear motor 28 and the electromagnet 49 of the lock device 10 is controlled by the control unit 60. The control unit 6A has a CPU, a memory, and the like, and also has a circuit for supplying a current to the coil of the linear motor 28 and the coil 48 of the electromagnet 49 in accordance with the result of the cpu calculation. The control unit 6 is also connected as a temperature monitoring device to a thermistor (temperature sensor) which is a temperature detecting device disposed in the linear motor 28. Further, the control unit (9) is omitted in the second drawing of 11 201006656. Fig. 3 shows the relationship between the thermistor and the control unit. In the same figure, the mover 29 and the stator 31 in the linear motor 28 are shown enlarged. In the same drawing, the same portions as those in Fig. 1 or Fig. 2 are given the same reference numerals, and the description thereof will be appropriately omitted. # In Fig. 3, three thermistors 62u, 62v, and 62wr (hereinafter collectively referred to as "thermistor 62") are respectively arranged to detect the coil 35 of the U phase, the coil 35 of the V phase, and the coil of the w phase. 35w temperature. That is, the thermistor 62 is disposed in all of the three-phase coils. The control unit 60 is connected to the thermistor 62 via the switch 61. Before being connected to the control unit 60, the switcher 61 switches to the arrogant Leiyang^9 blade responsive resistor 62 corresponding to the phase selected as the monitoring target from the three phases. The control unit 60 monitors the temperature detected by the switcher connected to the thermistor 62, and performs control to be described later in accordance with the temperature. The switching before the connection by the switch 61 can be automatically performed by the control unit 60, or can be performed arbitrarily. In the case of the latter (manual) reference, the switch 61 can be a theoretical component. That is, the control unit 6 can be directly connected without switching via =. The thermistor 6^ corresponding to the phase to be monitored is also configured to be switched. For example, it can be opened by the general-purpose one, and the other is the target of the monitoring, and it is the right to open and close. That is, the detected temperature is selected in the detected value during the mold opening and closing operation. As a result, the selection of the thermistor 62 (temperature) of the second = is selected as the monitoring target. 4 degree (four) resistance 62 12 201006656 Then, in Fig. 3, the permanent magnet 32 pole and the three poles of the magnetic poles are alternately arranged on the mover 29 at intervals. Here, the interval of the permanent magnets of the same pole is called "magnetic pole pair pitch". In the same figure, the magnetic pole pair spacing is 2P. Therefore, the interval between the permanent magnets 32 is "magnetic pole pair pitch 2P + 2". In the same figure, the acceleration/deceleration distance L at the time of opening and closing of the mold of the mold clamping device 1 (when the mold is transferred) is shown. The acceleration/deceleration distance l is called the distance between the accelerated section (acceleration section) during the transfer (the distance from the mold transfer to the constant speed state) or the distance of the decelerated section (deceleration section) (from the constant speed) Further, the illustrated acceleration/deceleration distance L is a length described to indicate the relative relationship with the magnetic pole pair pitch 2P, and is not an absolute interval (position) indicating the acceleration/deceleration distance L. The magnetic pole pair 2P is expressed longer than the acceleration/deceleration distance (at least one of the distance between the acceleration section and the deceleration section). In the linear motor 28, the current supply tends to be concentrated and decelerated at a characteristic As a result, the temperature of the specific phase may be much higher than that of the other phases. In particular, in the mold clamping device of the injection molding machine, in the mass production molding, the mold opening position and the mold closing position are determined by the molding conditions. The linear motor 28 repeatedly accelerates and decelerates in the same section. At this time, there is a high possibility that current concentrates in a specific phase. Here, in the present embodiment, testability is performed. The temperature (the temperature of the thermistor 62) of the highest temperature detected during the mold opening and closing operation is selected as the monitoring target. This prevents the omission of the abnormality detection. That is, when the monitoring target is arbitrarily selected, 'select the above. In addition to the specific phase, 13 201006656 is abnormally raised for the monitoring target. As a result, although the temperature method of the phase specific to the monitoring party of the present embodiment may not be detected, it does not occur. In the monitoring method of the embodiment, only one phase (the specific phase described above) is used as the monitoring target, and the cost related to the temperature monitoring can be reduced as compared with the case where all the phases are monitored. The connection control unit 6G The facility or machine with the thermistor 62 may correspond to only the specific phase setting described above. Moreover, the acceleration/deceleration distance L is not limited to the distance at which the acceleration is completely 〇. The speed pattern may be assumed to be large after the start of the mold transfer. The acceleration is accelerated and then accelerated with a small acceleration. In this speed graph, the concept of acceleration and deceleration distance L is included from the mold. The distance from the start position of the transfer to the acceleration reduction or the distance from the start position of the mold transfer to the peak of the acceleration. Next, the operation of the mold clamping device 1A will be described with reference to Fig. 4. Fig. 4 is a linear motor used for opening and closing the mold. In the same figure, '(A) indicates the relationship between the position and the speed of the mover 29 of the linear motor 28' (4) indicates the relationship between the position and the acceleration of the mover 29 of the linear motor 28 (C) The relationship between the position of the mover 29 of the linear motor 28 and the current value supplied to the coil 35 of the linear motor 28, (D) is the position of the mover of the linear motor 28 and the three-phase U phase of the linear motor 28: center line An example of the phase of the current of the individual coils 35 of the 'V phase: solid line, w; {: day. 忐 green, u Vro W phase, broken line). Moreover, the right axis Λ, in (Α), (Β), (C), and (D), the axes (positions) are identical. 201006656 In the state shown in Fig. 2, the control unit 6 〇 supplies current to the coil 35. Thereby, the linear motor 28 is driven to adsorb the plate. Advancing along with the movable plate 12. The control unit 60 supplies a current for obtaining the maximum acceleration to the coil 35 in the acceleration section. Therefore, the mover 29 of the linear motor 28 is accelerated by the maximum acceleration in the acceleration section. At this time, the current value Ua corresponding to the mold opening position is applied to the coil 35 of the u phase. Similarly, a current value Va is applied to the coil holder of the v-phase, and a current value Wa is applied to the W phase. Applied to? Phase current • The value is as small as shown. Thereafter, when the acceleration as shown in (A) continues, the mold opening speed of the movable panel 12 is sequentially increased. Then, as shown in (D), the current value flowing in the u phase also increases. On the one hand, the current flowing in the v phase slowly approaches 0 [Α]. In this case, the current flowing into the υ phase during acceleration is the largest. The heat generation of the ϋ phase is also larger than that of the other phases. When the position of the linear motor 28 exceeds the acceleration section, the control unit 6 reduces the amount of current supplied. As a result, the linear motor 28 moves at a constant speed. Next, when the mover .29 of the linear motor 28 reaches the start of the deceleration section. • When the position i is i, the control unit 60 supplies a current (current opposite to the acceleration section) for obtaining the maximum deceleration to the coil 35. At this time, the current value Ub corresponding to the deceleration start position is applied to the coil 35 of the u phase. Similarly, a current value vb is applied to the coil 35 of the V phase, and a current value Wb is applied to the phase. The current value Vb applied to the v-phase is as small as shown. Thereafter, when the deceleration as shown in (A) continues, the mold closing speed of the movable panel 12 is sequentially decreased. Then, as shown in (D), the current value flowing in the u phase also increases. On the one hand, the current flowing in the W phase slowly approaches 〇[Α]. In this case, the current flowing into the υ phase at the time of deceleration is the largest, and the amount of heat generated in the ϋ phase is also larger than that of the other phases. Thereafter, 15 201006656 the mover 29 of the linear motor 28 is decelerated at the maximum deceleration and stops at the closed position. The current values of the respective phases at the time of the stop are Uc, Vc, and Wc. Next, the control unit 60 supplies a current to the coil 48. Thereby, the adsorption portion 51 of the magnetic body and the attachment plate 22 is adsorbed by the adsorption force of the electromagnet 49. As a result, the suction force is transmitted to the movable plate 12 via the suction plate 22 and the rod 39 as a clamping force, and the mold is clamped. Further, the control unit 60 determines the current value supplied to the coil 48 with the clamping force as the target set value, and controls the mode by supplying the current to the coil 48. While the mold is being clamped, in the injection device 17, the molten resin is ejected from the injection nozzle 18 and filled in the cavity of the mold device 19. When the resin in the cavity space is solidified, the control 卩 60 stops the supply of current to the coil 48 in the state shown in the figure. At this time, even if the motor is stopped to the coil 48, since the magnetic gas remains in the adsorption portion 51, when the coil is clamped, a current is supplied in the reverse direction to remove the magnetic oxygen remaining in the adsorption port 51. Next, the control unit 60 supplies the electric power coil 5 in the reverse direction at the time of mold closing. At this time, the current is applied to the current corresponding to the current value (uc (refer to D)) at the mold closing position, and the waveform is reversed. The coil wire motor 28 of the phase is driven to retract the movable plate 12. As shown in Fig. 2, the island finger jaw movable mold 16 is moved to the reverse limit position to perform mold opening. This is because even in the mold opening operation, since the waveform (8) is vertically symmetrical, the amount of current entering the head is the largest, and the amount of heat generation of the U phase is controlled to be 28 when the heat generation of the U phase is higher than that of the other portion 60. The line type horse is controlled according to the same speed pattern as when the mold is closed. 201006656 As described above, the control unit 60 also performs the following processing at the time of mold closing and mold opening (during mold transfer). Fig. 5 is a view for explaining a processing procedure performed by the control unit at the time of mold transfer. In step S101, the control unit 60 receives the detected value by the thermistor 62 connected via the switch 61 (that is, the thermistor 62 corresponding to the phase selected as the object to be monitored in advance) (the coil 35 Input for detecting temperature). According to Fig. 4D, in the present embodiment, the U current is supplied to the maximum current in the acceleration section. Therefore, the detected temperature is input from the U-phase thermistor 62u. Next, the control unit 60 calculates the rising temperature from the initial state (S102). The initial state refers to a state before current is supplied to the coil 35. In other words, the control unit 60 maintains the detected temperature (initial temperature) in the initial state. The rising temperature is calculated by subtracting the initial temperature from the detected temperature input in step S101. Next, the control unit 60 determines whether or not the threshold value of the preset rising temperature is exceeded (S103). Further, the steps sl1 to sl3 are repeated as the mold is transferred. When the rising temperature exceeds the threshold value (YES in S103), the control unit 6 stops the mold transfer of the linear motor 28 (s1 to 4). Further, 'in Fig. 5', an example in which the rising temperature is compared with the threshold value is explained, but the detected temperature is compared with the threshold value. As described above, according to the mold clamping device 10 of the present embodiment, since the phase for supplying the maximum current for obtaining the acceleration is selected among the three phases (that is, the phase having the most excellent acceleration), the coil 35 can be appropriately prevented. Abnormal conditions caused by fever. 17 201006656 , * 2 : In the acceleration section and the deceleration section, even when the maximum supply of electricity is the highest: the second detected in the test opening and closing mode operation: the other phase is the monitoring target...Testability In the case where the highest temperature phase measured by the opening and closing mode operation 75 is two, any one of the phases can be selected as the monitoring target. In any case, the temperature. The present invention is not limited to the specific embodiments, and various modifications and changes can be made to the present invention within the scope of the gist of the invention described in the claims. The international application is based on the patent application No. 2008-100266 filed on April 8, 2008, and the entire contents of No. 2〇〇8_1〇〇266 are used in this international application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a state in which a mold apparatus and a mold clamping apparatus according to an embodiment of the present invention are closed. Fig. 2 is a side view showing a state in which a mold apparatus and a mold clamping apparatus according to an embodiment of the present invention are opened. Fig. 3 is a view showing the relationship between the thermistor and the control unit. Fig. 4 (A) to (D) are diagrams showing an example of an operation pattern of a linear motor used for opening and closing of a mold. Fig. 5 is a view for explaining the processing procedure performed by the control unit when the mold is transferred. 18 201006656 [Main component symbol description]

10〜鎖模裝置 11〜固定板 12〜可動板 13〜後板 13a' 〜腳部 14~ 連桿 15〜固定模具 16〜可動模具 17〜射出裝置 18〜射出喷嘴 19〜模具裝置 21〜導柱 22〜吸附板 23〜導孔 24〜大直徑部 25〜小直徑部 28〜線性馬達 29〜動子 31~ 定子 3 3〜磁極齒 34〜芯材 35〜線圈 37〜電磁鐵單元 20100665610~ Clamping device 11 to fixed plate 12 to movable plate 13 to rear plate 13a' to leg portion 14 to connecting rod 15 to fixed mold 16 to movable mold 17 to injection device 18 to injection nozzle 19 to mold device 21 to guide column 22~ adsorption plate 23 to guide hole 24 to large diameter portion 25 to small diameter portion 28 to linear motor 29 to mover 31 to stator 3 3 to magnetic pole tooth 34 to core material 35 to coil 37 to electromagnet unit 201006656

39〜桿 41、42〜孔 4 3〜螺紋 44〜螺帽 46〜芯材 47〜輕 48〜線圈 49〜電磁鐵 51〜吸附部 60〜控制部 61〜切換器 62u、62v、62w〜熱敏電阻 81〜空間39 to rod 41, 42 to hole 4 3 to thread 44 to nut 46 to core 47 to light 48 to coil 49 to electromagnet 51 to adsorption unit 60 to control unit 61 to switch 62u, 62v, 62w to thermal Resistance 81 ~ space

Fr〜框架Fr ~ frame

Gd〜導件Gd~ guide

Gb〜導件基座Gb~guide base

Sb〜滑動基座 20Sb~slide base 20

Claims

201006656 VII. Patent application scope · 1′—A type of clamping device that is opened and closed by a three-phase AC type linear motor, and has a temperature monitoring device that monitors the three individual coils of the linear motor. The acceleration of the mold transfer is most helpful for the temperature of the coil. 2. The mold clamping device according to claim 1, wherein the pitch of the magnetic pole pairs of the permanent magnets of the linear motor is longer than the distance from the start φ position of the mold transfer to the peak position of the acceleration. The mold clamping device according to claim 1 or 2, wherein the magnetic pole pair pitch is longer than at least one of a distance between the acceleration interval of the mold transfer and a speed reduction interval of the mold transfer. 4. The mold clamping device of claim 1, 2 or 3, wherein the transfer of the mold is stopped corresponding to the temperature monitored by the temperature monitoring device. 5. The mold clamping device of any one of claims 1, 2, 3 or 4, further comprising a temperature detecting device for detecting all of the three-phase coils of the linear motor The temperature of the coil. 6. The mold clamping device of claim 5, wherein the temperature monitoring device detects the temperature of the coil of the selected phase based on the detected value of the temperature detecting device. twenty one