TWM619315U

TWM619315U - Hollow molding machine

Info

Publication number: TWM619315U
Application number: TW109216897U
Authority: TW
Inventors: 関根徹夫
Original assignee: 関根徹夫
Priority date: 2020-08-27
Filing date: 2020-12-22
Publication date: 2021-11-11
Also published as: JP6801141B1; TWI832027B; TW202208149A; JP2022038809A

Abstract

本創作提供抑制成為製品不良之原因之裝置本體之振動等之中空成形機。夾緊機構4之框架21，分別經由前後一對之上連桿51與下連桿52而被連結於裝置本體2。於裝置本體2之中央下部，配置有具有大致半圓形狀之塊體61a之配重61。從配重61起往塊體61a之相反側延設曲柄臂61b，另一方面，於夾緊機構4之框架21之右側面固設有托架28。曲柄臂61b之前端與托架28(即，框架21)，經由曲柄銷62及連結銷63，而被連桿65連結。 This creation provides a hollow molding machine that suppresses the vibration of the device body that is the cause of product defects. The frame 21 of the clamping mechanism 4 is connected to the device body 2 via a pair of front and rear upper links 51 and lower links 52, respectively. At the lower center of the device body 2, a weight 61 having a block 61a having a substantially semicircular shape is arranged. A crank arm 61b extends from the counterweight 61 to the opposite side of the block 61a. On the other hand, a bracket 28 is fixed on the right side of the frame 21 of the clamping mechanism 4. The front end of the crank arm 61 b and the bracket 28 (that is, the frame 21) are connected by the connecting rod 65 via the crank pin 62 and the connecting pin 63.

Description

中空成形機Hollow forming machine

本創作係有關供中空樹脂製品之製造之中空成形機，詳言之，係有關謀求因裝置本體之振動所致之製品不良之抑制等之技術。 This creation is related to the hollow molding machine for the manufacture of hollow resin products. In detail, it is related to technologies that seek to suppress product defects caused by the vibration of the device body.

作為有效率地生產藥瓶等中空樹脂製品之裝置，已知有直接型坯方式之中空成形機(亦稱為吹氣成形機)(參照專利文獻1~3)。此種中空成形機，係由使熱可塑性樹脂加熱熔融後由型坯模擠出以作為筒狀之型坯之型坯擠出裝置、設有用以形成製品外形之空腔之開閉式成形模具、將成形模具保持成開閉自如之夾緊機構、於夾緊機構之上方將型坯切斷之型坯切斷裝置、將高壓氣體吹入被保持於成形模具之型坯內之吹嘴保持成能進退之吹氣裝置等所構成。 As an apparatus for efficiently producing hollow resin products such as medicine bottles, a direct parison type hollow molding machine (also referred to as a blow molding machine) is known (refer to Patent Documents 1 to 3). This type of hollow molding machine is composed of a parison extrusion device that heats and melts a thermoplastic resin and then extrudes it from a parison die to form a cylindrical parison, an open and closed molding die for forming a cavity to form the shape of the product, A clamping mechanism that keeps the forming mold open and closed, a parison cutting device that cuts off the parison above the clamping mechanism, and a blowing nozzle that blows high-pressure gas into the parison held in the mold to maintain the ability Composed of forward and backward blowing devices.

夾緊機構，一般係藉由油壓缸驅動，於型坯擠出裝置與吹氣裝置之間往復動。作為夾緊機構之移動方式，已知有於水平配置之型坯擠出裝置與吹氣裝置之間直進動之直動式。於直動式之情形，夾緊機構4如圖10(a)所示，在型坯擠出單元3之下停止，使成形模具31保持自型坯模擠出之型坯13之後，如圖10(b)所示，被油壓缸驅動而開始移動(起動)，如圖10(c)所示，在吹氣裝置6之下停止而使吹嘴41位於型坯13內。對型坯13之中空部由吹嘴41供給壓縮空氣，膨脹後之型坯13之外表面黏附於成形模具31之空腔37而完成成形。型坯13於被冷卻後自成形模具31釋放，並藉由切斷裝置(未圖示)將上下之不要部分切斷以成為製品。 The clamping mechanism is generally driven by a hydraulic cylinder to reciprocate between the parison extrusion device and the blowing device. As the movement method of the clamping mechanism, a linear movement type which moves directly between the parison extrusion device and the blowing device arranged horizontally is known. In the case of the direct-acting type, the clamping mechanism 4, as shown in Figure 10(a), is stopped under the parison extrusion unit 3, and the forming die 31 is maintained after the parison 13 extruded from the parison die, as shown in Figure 10(a). As shown in 10(b), it is driven by the hydraulic cylinder to start moving (starting), and as shown in FIG. The blow nozzle 41 supplies compressed air to the hollow part of the parison 13, and the outer surface of the expanded parison 13 adheres to the cavity 37 of the forming mold 31 to complete the forming. The parison 13 is released from the forming die 31 after being cooled, and the upper and lower unnecessary parts are cut by a cutting device (not shown) to become a product.

[先前技術文獻] [Prior Technical Literature]

[專利文獻] [Patent Literature]

[專利文獻1]日本特開2004-160669號公報 [Patent Document 1] JP 2004-160669 A

[專利文獻2]日本特開2017-24193號公報 [Patent Document 2] JP 2017-24193 A

[專利文獻3]日本特開2017-136764號公報 [Patent Document 3] JP 2017-136764 A

當夾緊機構4藉由開、關作動之油壓缸驅動之情形，於起動時由停止狀態急加速，於停止時由高速移動狀態急停止。因此，被保持於成形模具31之型坯13之中央部分(非拘束部分)，於夾緊機構4起動時，因慣性而相對於行進方向往後方撓曲而接觸於成形模具31之空腔37(圖10(b)中之X部)，另一方面，於夾緊機構4停止時，因慣性而相對於行進方向往前方撓曲而接觸於成形模具31之空腔37(圖10(c)中之Y部)。其結果，因型坯13接觸於空腔37之部位(X部、Y部)早期冷卻硬化，使製品產生成形不良(容器壁厚不均勻、表面凹陷等)。 When the clamping mechanism 4 is driven by a hydraulic cylinder that is actuated by opening and closing, it accelerates rapidly from a stopped state when starting, and stops abruptly from a high-speed moving state when stopped. Therefore, the central part (non-constrained part) of the parison 13 held by the forming die 31, when the clamping mechanism 4 is activated, is deflected backward with respect to the traveling direction due to inertia and contacts the cavity 37 of the forming die 31 (Part X in Fig. 10(b)) On the other hand, when the clamping mechanism 4 is stopped, it flexes forward with respect to the traveling direction due to inertia and contacts the cavity 37 of the forming die 31 (Fig. 10( c) Y part). As a result, the parts (X part, Y part) of the parison 13 contacting the cavity 37 are cooled and hardened at an early stage, resulting in product molding defects (uneven container wall thickness, surface depression, etc.).

另一方面，於轉動式之情形，也會於被油壓缸驅動之夾緊機構4之起動、停止時，因慣性力矩之急增減導致裝置本體振動，而與直動式同樣地，因型坯之撓曲而於製品產生同樣之成形不良。此外，於小型細徑容器等之製造時，除了樹脂素材之選定自由度亦變少之外，為了抑制振動亦必須藉由螺栓等將裝置本體固定於地面。又，由於油壓缸因作動油之溫度而使作動速度產生變化，夾緊機構之作動曲線亦隨著時間的經過而產生變化。其結果，夾緊機構之動作變得不穩定，亦有與型坯擠出單元及切斷裝置等合作困難之問題。 On the other hand, in the case of the rotary type, the device body will vibrate due to the rapid increase or decrease of the moment of inertia when the clamping mechanism 4 driven by the hydraulic cylinder is started or stopped. The deflection of the parison produces the same forming defects in the product. In addition, in the manufacture of small-diameter containers, etc., in addition to the reduced degree of freedom in the selection of resin materials, in order to suppress vibration, the device body must be fixed to the ground by bolts or the like. In addition, since the operating speed of the hydraulic cylinder changes due to the temperature of the operating oil, the operating curve of the clamping mechanism also changes with the passage of time. As a result, the operation of the clamping mechanism becomes unstable, and there is also a problem that it is difficult to cooperate with the parison extrusion unit and cutting device.

本創作係有鑑於上述課題而完成者，其目的在於提供抑制因夾緊機構之慣性力矩之急增減所致之裝置本體之振動等，藉此謀求製品不良之降低之旋動式之中空成形機。 This creation was completed in view of the above-mentioned issues, and its purpose is to provide restraint due to clamping A rotary hollow forming machine that reduces product defects due to the vibration of the device body caused by the rapid increase or decrease of the moment of inertia of the mechanism.

本創作之中空成形機，其特徵在於，具備：型坯擠出手段，使熱可塑性樹脂加熱熔融而自型坯模往下方擠出來作為筒狀之型坯；成形模具，形成用以形成製品外形之空腔，並且以該空腔之上下拘束該型坯來保持；夾緊機構，將該成形模具保持成能開閉；型坯切斷手段，將該型坯在該型坯模之下方切斷；吹氣手段，將用以於該型坯內將高壓氣體往下方吹入之吹嘴保持成能於上下方向進退；以及驅動機構；該驅動機構，使該夾緊機構於該型坯擠出手段之下方與該吹氣手段之下方之間往復移動，在該型坯擠出手段之下方使該成形模具保持該型坯，在該吹氣手段之下方使該型坯接受該吹嘴；該驅動機構具備配重，該配重產生將於對該夾緊機構之驅動方向產生之慣性力矩抵銷之方向之慣性力矩。 The hollow forming machine of this creation is characterized by: a parison extrusion means that heats and melts the thermoplastic resin and extrudes it from the parison mold downward to form a cylindrical parison; a forming die is formed to form the product shape The parison is held by restraining the parison from above and below the cavity; the clamping mechanism keeps the forming mold open and closed; the parison cutting means cuts the parison below the parison mold ; Blowing means to keep the blowing nozzle used to blow high-pressure gas downward in the parison to be able to advance and retreat in the up and down direction; and a driving mechanism; the driving mechanism enables the clamping mechanism to extrude the parison The lower part of the means and the lower part of the blowing means move back and forth, the forming die holds the parison under the parison extrusion means, and the parison receives the blowing nozzle under the blowing means; the The driving mechanism is provided with a counterweight, and the counterweight generates a moment of inertia in a direction that will offset the moment of inertia generated in the driving direction of the clamping mechanism.

較佳係，該配重設於該驅動機構之驅動路徑內之旋動中心。 Preferably, the counterweight is arranged at the center of rotation in the driving path of the driving mechanism.

較佳係，該夾緊機構，於裝置本體被平行連桿支承，並且在與該旋動中心隔著間隔之位置經由連結構件而被連結於該配重。 Preferably, the clamping mechanism is supported by a parallel link in the device body, and is connected to the counterweight via a connecting member at a position spaced apart from the center of rotation.

較佳係，於該夾緊機構之旋動起點與旋動終點中之至少一方，該旋動中心、將該夾緊機構與該連結構件連結之第1連結點、及將該配重與該連結構件連結之第2連結點排列於大致直線上。 Preferably, at least one of the rotation start point and the rotation end point of the clamping mechanism, the rotation center, the first connection point connecting the clamping mechanism and the connecting member, and the counterweight and the The second connecting points connected by the connecting member are arranged on a substantially straight line.

較佳係，該驅動機構將伺服馬達作為驅動源。 Preferably, the drive mechanism uses a servo motor as a drive source.

依本創作之中空成形機，因夾緊機構之移動所致之慣性力矩之至少一部分被配重之旋動所致之逆方向之慣性力矩抵銷，裝置本體之振動被抑制而使成形模具內之型坯之撓曲難以發生。 According to this creation of the hollow forming machine, at least part of the moment of inertia caused by the movement of the clamping mechanism is offset by the moment of inertia in the opposite direction caused by the rotation of the counterweight, and the vibration of the device body is suppressed to make the forming mold The deflection of the parison is difficult to occur.

又，藉由配重構成使夾緊機構移動之夾緊機構驅動機構之一部分，能減少中空成形機之構造和零件數量。 In addition, by forming a part of the clamping mechanism driving mechanism for moving the clamping mechanism by the counterweight, the structure and the number of parts of the hollow forming machine can be reduced.

又，藉由夾緊機構於裝置本體被平行連桿支承，並且在與驅動機構之旋動中心隔著間隔之位置經由連結構件而被連結於配重，夾緊機構與配重之同步作動被確實進行。 In addition, the clamping mechanism is supported by the parallel link on the main body of the device, and is connected to the counterweight at a position spaced apart from the rotation center of the drive mechanism via a connecting member, and the clamping mechanism and the counterweight are synchronized with each other. It does.

又，藉由在夾緊機構之旋動起點與旋動終點中之至少一方，第2旋動中心、將夾緊機構與連結構件連結之第1連結點、及將配重與連結構件連結之第2連結點排列於大致直線上，在起動時及停止時之夾緊機構之旋動角速度變小，而能抑制慣性力矩之急增減。 In addition, by at least one of the rotation start point and the rotation end point of the clamping mechanism, the second rotation center, the first connection point connecting the clamping mechanism and the connecting member, and the connection between the counterweight and the connecting member The second connection points are arranged on a substantially straight line, and the rotation angular velocity of the clamping mechanism at the time of starting and stopping is reduced, and the rapid increase and decrease of the moment of inertia can be suppressed.

又，藉由夾緊機構之驅動機構將伺服馬達作為驅動源，能自由設定夾緊機構之旋動角速度，故慣性力矩之急增減所致之振動抑制與生產效率之提升能並存。 In addition, by using the servo motor as the driving source of the clamping mechanism, the rotation angular velocity of the clamping mechanism can be set freely, so the vibration suppression caused by the rapid increase or decrease of the inertia moment can coexist with the improvement of production efficiency.

1:中空成形機 1: Hollow forming machine

2:裝置本體 2: Device body

3:型坯擠出單元 3: parison extrusion unit

4:夾緊機構 4: Clamping mechanism

5:型坯切斷裝置 5: parison cutting device

6:吹氣裝置 6: Blowing device

11:擠出單元本體 11: Extrusion unit body

12:型坯模 12: parison mold

13:型坯 13: parison

14a:模頭 14a: Die head

14b:模頭 14b: Die head

21:框架 21: Frame

22:軌道 22: Orbit

23、24:模具保持具 23, 24: Mold holder

25、26:連桿 25, 26: connecting rod

27:螺桿軸 27: Screw shaft

28:托架 28: Bracket

31:成形模具 31: Forming mold

32:前半模 32: front half

33:後半模 33: Rear half mold

35:拘束部 35: Restraint Department

36:拘束部 36: Restraint Department

37:空腔 37: Cavity

37a:口部空腔 37a: oral cavity

37b:胴部空腔 37b: Carcass cavity

41、41a、41b:吹嘴 41, 41a, 41b: mouthpiece

42:下降機構 42: drop mechanism

51:上連桿 51: upper link

51a:連結點 51a: connection point

51b:連結點 51b: connection point

52:下連桿 52: Lower link

52a:連結點 52a: connection point

52b:連結點 52b: connection point

61:配重 61: counterweight

61a:塊體 61a: block

61b:曲柄臂 61b: crank arm

62:曲柄銷 62: crank pin

63:連結銷 63: Link pin

65:連桿 65: connecting rod

71:同軸減速機 71: Coaxial reducer

71a:軸 71a: axis

72:伺服馬達 72: Servo motor

73:驅動鏈輪 73: drive sprocket

74:正時皮帶 74: Timing belt

75:從動鏈輪 75: driven sprocket

A:最上升位置附近 A: Near the highest ascent position

B:最下降位置附近 B: Near the most descending position

C1:第1旋動中心(虛擬旋動軸心) C1: The first rotation center (virtual rotation axis)

C2:第2旋動中心(同軸減速機之軸之軸心) C2: The second rotation center (the axis of the coaxial reducer)

G1:重心 G1: Center of gravity

G2:重心 G2: Center of gravity

P1:連結點 P1: Connection point

P2:連結點 P2: Connection point

X:型坯接觸於空腔之部位 X: The part where the parison touches the cavity

Y:型坯接觸於空腔之部位 Y: The part where the parison touches the cavity

[圖1]係表示中空成形機之夾緊機構之驅動裝置之前視圖。 [Figure 1] is a front view showing the driving device of the clamping mechanism of the hollow forming machine.

[圖2]係表示中空成形機之夾緊機構之驅動裝置之側視圖。 [Figure 2] is a side view showing the driving device of the clamping mechanism of the hollow forming machine.

[圖3]係成形模具之前視圖。 [Figure 3] is the front view of the forming die.

[圖4](a)、(b)係表示夾緊機構之動作之示意圖。 [Figure 4] (a) and (b) are schematic diagrams showing the action of the clamping mechanism.

[圖5]係表示成形模具保持型坯之狀態之圖。 [Fig. 5] is a diagram showing the state in which the molding die holds the parison.

[圖6](a)~(c)係表示自夾緊機構之最上升位置往最下降位置之動作之示意圖。 [Figure 6] (a)~(c) are schematic diagrams showing the movement from the highest position of the clamping mechanism to the lowest position.

[圖7]係表示配重之旋轉與夾緊機構之上下之關係之曲線圖。 [Figure 7] is a graph showing the relationship between the rotation of the counterweight and the up and down of the clamping mechanism.

[圖8]係表示吹嘴將壓縮空氣供給至型坯之狀態之圖。 [Fig. 8] A diagram showing a state in which the blowing nozzle supplies compressed air to the parison.

[圖9](a)~(c)係表示自夾緊機構之最下降位置往最上升位置之動作之示意圖。 [Figure 9] (a)~(c) are schematic diagrams showing the movement from the lowest position of the clamping mechanism to the highest position.

[圖10](a)~(c)係表示習知裝置之問題點之圖。 [Figure 10] (a)~(c) are diagrams showing the problems of conventional devices.

以下，使用圖1至圖9詳細說明本創作之一實施形態。 Hereinafter, an embodiment of this creation will be described in detail using FIGS. 1 to 9.

<實施形態之構成> <Constitution of Implementation Mode>

圖1係表示本創作之中空成形機之夾緊機構之驅動裝置之前視圖，圖2係其側視圖。於本案之說明中，將圖1之上側設為中空成形機之上側，面向圖1將左側設為中空成形機之左側，面向圖2將左側設為中空成形機之前側。 Fig. 1 is a front view showing the driving device of the clamping mechanism of the hollow forming machine of the invention, and Fig. 2 is a side view thereof. In the description of this case, the upper side of Fig. 1 is referred to as the upper side of the hollow forming machine, the left side facing Fig. 1 is referred to as the left side of the hollow forming machine, and the left side facing Fig. 2 is referred to as the front side of the hollow forming machine.

如圖1所示，中空成形機1，將構成裝置本體之模具移動台(以下，記載為裝置本體2)、配置於裝置本體2之左上之型坯擠出單元3、旋動自如地被支承於裝置本體2之夾緊機構4、配置於型坯擠出單元3之下方最近處之型坯切斷裝置5、及配置於型坯擠出單元3之斜右上之吹氣裝置6作為主要之構成要素。 As shown in Fig. 1, the hollow forming machine 1 rotatably supports the mold moving table (hereinafter referred to as the device body 2) constituting the device body and the parison extrusion unit 3 arranged on the upper left of the device body 2 The clamping mechanism 4 in the main body 2 of the device, the parison cutting device 5 arranged at the nearest position below the parison extrusion unit 3, and the air blowing device 6 arranged on the diagonally upper right side of the parison extrusion unit 3 are the main ones. Component elements.

型坯擠出單元3，係由將投入給料斗之熱可塑性樹脂之顆粒加熱熔融之加熱缸及熔融樹脂往前方搬送之擠出螺桿等構成之公知之擠出單元本體11、及安裝於擠出單元本體11之前端之雙頭式之型坯模12所構成。於中空成形機1之運轉時擠出單元本體11繼續作動，左右一對之型坯13自型坯模12往下方被持續擠出。 The parison extrusion unit 3 is a well-known extrusion unit body 11 composed of a heating cylinder that heats and melts pellets of thermoplastic resin fed into the hopper and an extrusion screw that conveys the molten resin forward, and is installed in the extruder The front end of the unit body 11 is composed of a double-headed parison mold 12. During the operation of the hollow forming machine 1, the extrusion unit main body 11 continues to operate, and the left and right pair of parisons 13 are continuously extruded from the parison mold 12 downward.

夾緊機構4，係由鋼板熔接構造品之框架21、設置於框架21之上表面之左右一對之軌道22、被軌道22導引而滑動之前後一對之模具保持具23、24、使模具保持具23、24彼此接近、離開之開閉連桿25、26、驅動開閉連桿25、26之螺桿軸27等所構成。 The clamping mechanism 4 consists of a frame 21 of a steel plate welded structure, a pair of left and right rails 22 provided on the upper surface of the frame 21, a pair of mold holders 23, 24 before and after sliding guided by the rail 22, and The mold holders 23 and 24 are composed of opening/closing links 25, 26, which drive the opening/closing links 25, 26, and the like.

於模具保持具23、24，保持有由前半模32與後半模33構成之前後分割式之成形模具31。於模具保持具23固定有成形模具31之前半模32，另一方面，於模具保持具24固定有成形模具31之後半模33。 The mold holders 23 and 24 hold a front-rear split forming mold 31 composed of a front half-mold 32 and a rear half-mold 33. The former half-mold 32 of the forming mold 31 is fixed to the mold holder 23, on the other hand, the latter half-mold 33 is fixed to the mold holder 24.

如圖3所示，成形模具31(前半模32、後半模33)，形成有於成形模具31閉鎖時將型坯13夾入之上下之拘束部35、36、及用以形成製品外形之空腔37。本實施形態之成形模具31係供小型細徑之螺桿管瓶之製造者，空腔37係由用以形成口部之口部空腔37a、及用以形成圓筒狀之胴部之胴部空腔37b所構成。 As shown in FIG. 3, the forming mold 31 (front half mold 32, rear half mold 33) is formed with restraining portions 35, 36 that clamp the parison 13 up and down when the forming mold 31 is closed, and voids for forming the shape of the product Cavities 37. The forming mold 31 of this embodiment is for the manufacture of small and narrow screw vials. The cavity 37 is composed of a mouth cavity 37a for forming a mouth and a body part for forming a cylindrical body part. The cavity 37b is formed.

型坯切斷裝置5，係由以伺服馬達及滾珠螺桿驅動之刀具等構成，於型坯13被保持於成形模具31後隨即將型坯13切斷。 The parison cutting device 5 is composed of a cutter or the like driven by a servo motor and a ball screw, and cuts the parison 13 after the parison 13 is held in the forming die 31.

吹氣裝置6，係由左右一對之吹嘴41a、41b和使此等吹嘴41a、41b下降之由伺服馬達及滾珠螺桿構成之下降機構42所構成，成形模具31往下方最近處移動後，使吹嘴41a、41b進入被保持於成形模具31之型坯13內，而將壓縮空氣吹入型坯13內。 The blowing device 6 is composed of a pair of left and right blowing nozzles 41a, 41b, and a lowering mechanism 42 composed of a servo motor and a ball screw that lowers the blowing nozzles 41a, 41b. The molding die 31 is moved to the nearest position below. , The blowing nozzles 41a and 41b are made to enter the parison 13 held by the forming die 31, and compressed air is blown into the parison 13.

(夾緊機構之旋動支承) (Rotating support of clamping mechanism)

夾緊機構4之框架21，分別經由上下一對之上連桿51與下連桿52而被連結於裝置本體2。上連桿51與下連桿52分別呈棒狀，當夾緊機構4位於最上升位置時配置於大致水平方向。上連桿51，於水平方向，配置於較下連桿52更靠近夾緊機構4之位置。上連桿51與下連桿52係相同物品，且與裝置本體2之連結點51a、52a間之距離、和與框架21之連結點51b、52b間之距離被設定成相等。又，上連桿51與下連桿52在連結點51a、51b、52a、52b被支承為可旋動。藉此，夾緊機構4與裝置本體2，和上連桿51及下連桿52一起構成平行連桿。 The frame 21 of the clamping mechanism 4 is connected to the device body 2 via a pair of upper and lower links 51 and a lower link 52, respectively. The upper link 51 and the lower link 52 each have a rod shape, and are arranged in a substantially horizontal direction when the clamping mechanism 4 is at the most elevated position. The upper link 51 is arranged at a position closer to the clamping mechanism 4 than the lower link 52 in the horizontal direction. The upper link 51 and the lower link 52 are the same article, and the distance between the connection points 51a and 52a of the device body 2 and the distance between the connection points 51b and 52b of the frame 21 are set to be equal. In addition, the upper link 51 and the lower link 52 are rotatably supported at the connection points 51a, 51b, 52a, and 52b. With this, the clamping mechanism 4 and the assembly The main body 2 and the upper connecting rod 51 and the lower connecting rod 52 form a parallel connecting rod.

如圖1所示，於水平方向相對於夾緊機構4在上連桿51側，於較上連桿51更下側，配置有具有大致半圓形狀之塊體61a之配重61。如圖2所示，配重61，被固定於同軸減速機71之軸71a，藉由設置於下方之伺服馬達72之驅動力經由驅動鏈輪73、正時皮帶74、從動鏈輪75傳達至同軸減速機71，而被旋轉驅動往左右任一之旋轉方向。 As shown in FIG. 1, on the upper link 51 side with respect to the clamping mechanism 4 in the horizontal direction, and on the lower side than the upper link 51, a weight 61 having a block 61 a having a substantially semicircular shape is arranged. As shown in Fig. 2, the counterweight 61 is fixed to the shaft 71a of the coaxial reducer 71, and the driving force of the servo motor 72 arranged below is transmitted through the driving sprocket 73, the timing belt 74, and the driven sprocket 75 To the coaxial reducer 71, it is rotationally driven to either the left or right direction of rotation.

自配重61以軸71a為中心往塊體61a之相反側延設有曲柄臂61b。在夾緊機構4之框架21之右側面固設有托架28。曲柄臂61b之前端與托架28，經由曲柄銷62與連結銷63，而被連桿65連結。托架28與連桿65、及連桿65與曲柄臂61b分別連結成能彼此相對旋轉。上連桿51、下連桿52、連桿65之旋轉中心軸線皆為大致水平方向、且彼此大致相同之方向(中空成形機1之前後方向)。 A crank arm 61b is extended from the counterweight 61 to the opposite side of the block 61a with the shaft 71a as the center. A bracket 28 is fixed on the right side of the frame 21 of the clamping mechanism 4. The front end of the crank arm 61 b and the bracket 28 are connected by a connecting rod 65 via a crank pin 62 and a connecting pin 63. The bracket 28 and the connecting rod 65, and the connecting rod 65 and the crank arm 61b are respectively connected so as to be rotatable relative to each other. The rotation center axes of the upper link 51, the lower link 52, and the link 65 are all substantially horizontal and in substantially the same direction (the front and back direction of the hollow forming machine 1).

如圖4示意地表示，如上述般由於夾緊機構4與裝置本體2係平行連桿之構成要素，故夾緊機構4(重心：G1)雖以第1旋動中心C1(虛擬旋動軸心)往復旋動，於旋動時亦保持直立狀態(圖1、圖2之狀態)。又，配重61(重心：G2)以第2旋動中心C2(同軸減速機71之軸71a之軸心)旋動。 As shown schematically in Fig. 4, since the clamping mechanism 4 and the device body 2 are components of the parallel link as described above, the clamping mechanism 4 (center of gravity: G1) is centered on the first rotation center C1 (virtual rotation axis The heart) rotates back and forth, and maintains an upright state when it rotates (the state of Fig. 1 and Fig. 2). In addition, the counterweight 61 (center of gravity: G2) rotates at the second rotation center C2 (the axis of the shaft 71a of the coaxial reducer 71).

於圖4中，將連桿65與托架28之相對旋轉之中心作為連結點P1，將曲柄臂61b與連桿65之相對旋轉之中心作為連結點P2。在夾緊機構4自旋動起點、即最上升位置(圖1、圖2、圖4(a))開始旋動之情形時，由前方觀察，則配重61繞順時針方向旋動，被連桿65拉往右下。藉此，夾緊機構4繞逆時針方向旋動。當夾緊機構4位於最上升位置時，第2旋動中心C2、連結點P1、及連結點P2排列於大致直線上，相對於配重61之旋轉量之夾緊機構4之旋動量變小。 In FIG. 4, the center of relative rotation between the connecting rod 65 and the bracket 28 is taken as the connection point P1, and the center of relative rotation between the crank arm 61b and the connecting rod 65 is taken as the connection point P2. When the clamping mechanism 4 starts to rotate at the starting point of rotation, that is, the highest position (Figure 1, Figure 2, Figure 4(a)), when viewed from the front, the counterweight 61 rotates clockwise and is The connecting rod 65 is pulled to the lower right. Thereby, the clamping mechanism 4 rotates in the counterclockwise direction. When the clamping mechanism 4 is at the highest position, the second rotation center C2, the connection point P1, and the connection point P2 are arranged on a substantially straight line, and the rotation amount of the clamping mechanism 4 relative to the rotation amount of the counterweight 61 becomes smaller .

另一方面，在夾緊機構4自旋動終點、即最下降位置(圖4(b))開始旋動之情形時，由前方觀察，則配重61繞逆時針方向旋動，藉由連結點P2(曲柄銷62)連結於曲柄臂61b之連桿65被推往斜左上方。藉此，藉由連結點P1(連結銷 63)連結於連桿65之夾緊機構4繞順時針方向旋動。不論夾緊機構4位於最下降位置時，或位於最上升位置時，都同樣地，第2旋動中心C2、連結點P1、及連結點P2排列於大致直線上，相對於配重61之旋轉量之夾緊機構4之旋動量變小。 On the other hand, when the clamping mechanism 4 spins at the end point, that is, the most descending position (Figure 4(b)), when it starts to spin, when viewed from the front, the counterweight 61 spins in a counterclockwise direction. The connecting rod 65 connected to the crank arm 61b at the point P2 (crank pin 62) is pushed obliquely to the upper left. In this way, by connecting point P1 (connecting pin 63) The clamping mechanism 4 connected to the connecting rod 65 rotates clockwise. Regardless of when the clamping mechanism 4 is at the most descending position or at the most ascending position, the second rotation center C2, the connection point P1, and the connection point P2 are arranged on a substantially straight line, relative to the rotation of the counterweight 61 The amount of rotation of the clamping mechanism 4 becomes smaller.

<實施形態之作用> <Effects of Implementation Mode>

中空成形機1開始運轉後，在型坯擠出單元3內熔融樹脂連續成形，此熔融樹脂自型坯模12之左右一對之模頭14a、14b分別作為型坯13被往下方擠出。在型坯13垂下至既定長度之時點，保持有成形模具31之夾緊機構4停止於型坯模12之下方最近處，隨後模具保持具23、24往閉鎖方向作動。藉此，如圖5所示，型坯13，其上下部分被拘束部35、36拘束，中間部於對空腔37之內壁具有間隙之狀態下被保持於成形模具31。型坯13被保持於成形模具31後，型坯切斷裝置5將型坯13切斷。 After the hollow molding machine 1 starts to operate, the molten resin is continuously molded in the parison extrusion unit 3, and the molten resin is extruded downward as the parison 13 from the left and right pair of die heads 14a, 14b of the parison mold 12, respectively. When the parison 13 hangs down to a predetermined length, the clamping mechanism 4 holding the forming mold 31 stops at the nearest position below the parison mold 12, and then the mold holders 23 and 24 are moved in the locking direction. Thereby, as shown in FIG. 5, the upper and lower parts of the parison 13 are restrained by the restraining parts 35 and 36, and the middle part is held by the forming mold 31 with a gap to the inner wall of the cavity 37. After the parison 13 is held by the forming die 31, the parison cutting device 5 cuts the parison 13.

型坯切斷裝置5將型坯13切斷後，夾緊機構4下降至吹氣裝置6之下方最近處。具體而言，配重61被伺服馬達72驅動而繞順時針方向旋動，如圖6(a)~(c)所示，夾緊機構4以第2旋動中心C2繞逆時針方向旋動，於到達最下降位置之時點停止。 After the parison 13 is cut by the parison cutting device 5, the clamping mechanism 4 is lowered to the nearest position below the blowing device 6. Specifically, the counterweight 61 is driven by the servo motor 72 to rotate in the clockwise direction. As shown in Figure 6 (a) to (c), the clamping mechanism 4 rotates in the counterclockwise direction with the second rotation center C2. , Stop when it reaches the most descending position.

當夾緊機構4旋動時雖產生較大的慣性力矩，但由於配重61之旋動方向與夾緊機構4逆方向，因此，夾緊機構4之慣性力矩之至少一部分藉由配重61之慣性力矩抵銷。又，如上述般，由於當夾緊機構4位於最上升位置及最下降位置時，相對於配重61之旋轉量之夾緊機構4之旋動量小，因此，在旋動開始時及旋動停止時，夾緊機構4之移動速度之每單位時間之變化量變小。在夾緊機構4之最上升位置及最下降位置附近，將伺服馬達72之旋轉速度控制成不急增或急減，藉此，亦能將每單位時間之夾緊機構4之移動速度之變化量更減小。此外，當夾緊機構4自最上升位置開始旋動時，由於不是往水平方向，而是往下方開始移動，因此能防止型坯13往水平方向撓曲之情況。 Although a large moment of inertia is generated when the clamping mechanism 4 is rotated, the rotation direction of the counterweight 61 is opposite to that of the clamping mechanism 4, so at least a part of the inertia moment of the clamping mechanism 4 is provided by the counterweight 61 The moment of inertia offsets. Also, as described above, when the clamping mechanism 4 is at the highest position and the lowest position, the amount of rotation of the clamping mechanism 4 relative to the amount of rotation of the counterweight 61 is small. Therefore, when the rotation starts and the rotation When it stops, the amount of change per unit time of the moving speed of the clamping mechanism 4 becomes smaller. In the vicinity of the most ascending position and the most descending position of the clamping mechanism 4, the rotation speed of the servo motor 72 is controlled so as not to increase or decrease rapidly, thereby, the amount of change in the moving speed of the clamping mechanism 4 per unit time can also be controlled More reduced. In addition, when the clamping mechanism 4 starts to rotate from the most elevated position, it starts to move downward instead of in the horizontal direction, so that the parison 13 can be prevented from being deflected in the horizontal direction.

藉由上述各特徵，抑制因慣性力矩所致之裝置本體2之振動、及起因於夾緊機構4之移動速度之變化所致之被保持於成形模具31之型坯13撓曲之情況，而防止與空腔37接觸所致之成形不良。圖7係表示配重61之旋轉與夾緊機構4之上下之關係之曲線圖。可以看出在夾緊機構4之最上升位置附近(圖7中之A部)及最下降位置附近(圖7中之B部)描繪出上下動緩慢變化之近似正弦曲線。 With the above features, the vibration of the device body 2 caused by the moment of inertia and the deflection of the parison 13 held by the forming die 31 caused by the change in the moving speed of the clamping mechanism 4 are suppressed, and Prevent poor molding caused by contact with cavity 37. FIG. 7 is a graph showing the relationship between the rotation of the counterweight 61 and the up and down of the clamping mechanism 4. It can be seen that the vicinity of the most ascending position of the clamping mechanism 4 (part A in FIG. 7) and the vicinity of the lowest position (part B in FIG. 7) depict an approximate sine curve that moves up and down slowly.

夾緊機構4旋動至最下降位置而停止在吹氣裝置6之下方最近處後，如圖8所示，吹嘴41a、41b自吹氣裝置6下降。下降之吹嘴41a、41b進入被保持於成形模具31之型坯13內，將型坯13之上方之不要部分切斷，將壓縮空氣吹入型坯13內。藉此，型坯13瞬間膨脹並黏附至成形模具31之空腔37而完成成形。型坯13於被冷卻後自成形模具31釋放，藉由下一步驟之切斷裝置(未圖示)將下方之不要部分切斷而成為製品。 After the clamping mechanism 4 is rotated to the lowest position and stops at the nearest position below the blowing device 6, as shown in FIG. 8, the blowing nozzles 41a and 41b are lowered from the blowing device 6. The descending blowing nozzles 41a and 41b enter the parison 13 held by the forming die 31, cut off the unnecessary part above the parison 13, and blow compressed air into the parison 13. Thereby, the parison 13 instantly expands and adheres to the cavity 37 of the forming mold 31 to complete the forming. After the parison 13 is cooled, it is released from the forming mold 31, and the unnecessary part below is cut by a cutting device (not shown) in the next step to become a product.

成形模具31在最下降位置將型坯13釋放後，夾緊機構4再度上升至型坯擠出單元3之下方最近處。即，配重61被伺服馬達72驅動而繞逆時針方向旋動後，如圖9(a)~(c)所示，與各構件自最上升位置往最下降位置移動之情形相反地作動，夾緊機構4以第2旋動中心C2繞順時針方向旋動而在到達最上升位置之時點停止，再度進行藉由成形模具31對型坯13之保持。 After the molding die 31 releases the parison 13 at the lowest position, the clamping mechanism 4 rises to the nearest position below the parison extrusion unit 3 again. That is, after the counterweight 61 is driven by the servo motor 72 to rotate in the counterclockwise direction, as shown in Figs. 9(a) to (c), it operates contrary to the situation in which each member moves from the highest position to the lowest position. The clamping mechanism 4 rotates clockwise with the second rotation center C2 and stops when it reaches the highest position, and the parison 13 is held by the forming die 31 again.

與自最上升位置往最下降位置移動之情形同樣地，於夾緊機構4自最下降位置往最上升位置移動之際，亦能有效地抑制裝置本體2之振動。因此，於自型坯模12被連續地擠出之型坯13不會產生因搖動所致之撓曲等，可防止製品不良。 Similar to the case of moving from the highest position to the lowest position, when the clamping mechanism 4 moves from the lowest position to the highest position, the vibration of the device body 2 can be effectively suppressed. Therefore, the parison 13 continuously extruded from the parison mold 12 will not be deflected due to shaking, and product defects can be prevented.

於本實施形態，藉由採用上述之構成，於小型細徑容器等之製造時能比較自由地選定樹脂素材，並且將裝置本體2固定於地面之必要性亦變低。此外，相較於以油壓缸驅動夾緊機構4者更能實現穩定之作動，型坯擠出單元3及切斷裝置5等之合作能確實地進行。進而，中空成形機1之運轉功率，相較於以油壓缸驅動者，能減少一半。 In this embodiment, by adopting the above-mentioned configuration, resin materials can be selected relatively freely when manufacturing small-diameter containers, etc., and the necessity of fixing the device main body 2 to the ground is also reduced. In addition, more stable operation can be achieved than when the clamping mechanism 4 is driven by a hydraulic cylinder, and the cooperation of the parison extrusion unit 3 and the cutting device 5 can be performed reliably. Furthermore, the operating power of the hollow forming machine 1 is The cylinder driver can be reduced by half.

以上，雖已說明具體之實施形態，但本創作之態樣並不限於此。例如，於上述實施形態中，雖配重還兼作使夾緊機構旋動之夾緊機構驅動機構之構成要素，但採用獨立於夾緊機構驅動手段之配重亦可。此外，關於夾緊機構之支承構造及驅動方法等，只要在不脫離本創作要旨之範圍能適宜變更。 Although the specific implementation form has been described above, the form of this creation is not limited to this. For example, in the above-mentioned embodiment, although the counterweight also serves as a constituent element of the clamping mechanism driving mechanism that rotates the clamping mechanism, a counterweight independent of the clamping mechanism driving means may be used. In addition, the support structure and driving method of the clamping mechanism can be appropriately changed as long as it does not deviate from the spirit of this creation.

[產業上之可利用性] [Industrial availability]

本創作，於供小型細徑容器之製造之中空成形機能有效地利用。 This creation can be effectively used in the hollow forming machine for the manufacture of small-diameter containers.

4:夾緊機構 4: Clamping mechanism

51:上連桿 51: upper link

51a:連結點 51a: connection point

51b:連結點 51b: connection point

52:下連桿 52: Lower link

52a:連結點 52a: connection point

52b:連結點 52b: connection point

61:配重 61: counterweight

61a:塊體 61a: block

61b:曲柄臂 61b: crank arm

62:曲柄銷 62: crank pin

63:連結銷 63: Link pin

65:連桿 65: connecting rod

71a:軸 71a: axis

G1:重心 G1: Center of gravity

G2:重心 G2: Center of gravity

P1:連結點 P1: Connection point

P2:連結點 P2: Connection point

Claims

一種中空成形機，其特徵在於，具備：型坯擠出手段，使熱可塑性樹脂加熱熔融而自型坯模往下方擠出來作為筒狀之型坯；成形模具，形成用以形成製品外形之空腔，並且以該空腔之上下拘束該型坯來保持；夾緊機構，將該成形模具保持成能開閉；型坯切斷手段，將該型坯在該型坯模之下方切斷；吹氣手段，將用以於該型坯內將高壓氣體往下方吹入之吹嘴保持成能於上下方向進退；以及驅動機構；該驅動機構，使該夾緊機構於該型坯擠出手段之下方與該吹氣手段之下方之間往復移動，在該型坯擠出手段之下方使該成形模具保持該型坯，在該吹氣手段之下方使該型坯接受該吹嘴；該驅動機構具備配重，該配重產生將於對該夾緊機構之驅動方向產生之慣性力矩抵銷之方向之慣性力矩；該配重設於該驅動機構之驅動路徑內之旋動中心；該夾緊機構，於裝置本體被平行連桿支承，並且在與該旋動中心隔著間隔之位置經由連結構件而被連結於該配重。 A hollow forming machine characterized by: a parison extrusion means for heating and melting a thermoplastic resin and extruding it from the parison die downward to form a cylindrical parison; and a forming die to form the hollow shape of the product. The parison is held by constraining the parison up and down with the cavity; the clamping mechanism keeps the forming mold open and closed; the parison cutting means cuts the parison below the parison mold; blowing The air means keeps the blowing nozzle used to blow high-pressure gas downward in the parison to be able to advance and retreat in the up and down direction; Reciprocating movement between the lower part and the lower part of the blowing means, the forming die holds the parison under the parison extrusion means, and the parison receives the blowing nozzle under the blowing means; the driving mechanism Equipped with a counterweight, the counterweight generates a moment of inertia in a direction that will offset the moment of inertia generated in the driving direction of the clamping mechanism; the counterweight is set at the center of rotation in the driving path of the driving mechanism; the clamping The mechanism is supported by the parallel link in the device body, and is connected to the counterweight via a connecting member at a position spaced apart from the center of rotation.

如請求項1之中空成形機，其中，於該夾緊機構之旋動起點與旋動終點中之至少一方，該旋動中心、將該夾緊機構與該連結構件連結之第1連結點、及將該配重與該連結構件連結之第2連結點排列於大致直線上。 Such as claim 1, wherein, in at least one of the rotation start point and the rotation end point of the clamping mechanism, the rotation center, the first connection point that connects the clamping mechanism and the connecting member, And the second connecting point connecting the counterweight and the connecting member is arranged on a substantially straight line.

如請求項1或2之中空成形機，其中，該驅動機構將伺服馬達作為驅動源。 Such as claim 1 or 2 hollow forming machine, in which, The drive mechanism uses a servo motor as a drive source.