JP2018176659A

JP2018176659A - Band heater

Info

Publication number: JP2018176659A
Application number: JP2017083633A
Authority: JP
Inventors: 有浩園原; Arihiro Sonohara
Original assignee: Tech Heiwa Co Ltd; Tech-Heiwa Co Ltd
Current assignee: Tech Heiwa Co Ltd; Tech-Heiwa Co Ltd
Priority date: 2017-04-20
Filing date: 2017-04-20
Publication date: 2018-11-15
Anticipated expiration: 2037-04-20
Also published as: JP6838741B2

Abstract

PROBLEM TO BE SOLVED: To provide a band heater having a heater body which can be easily attached to and detached from a body to be heated, thereby achieving easy attachment work and replacement work.SOLUTION: In the band heater, a heater body 3 is provided with a cut line in a center axis direction X to form an open part 14 and also to provide one side end folded part 15A and the other side end folded part 15B where one side end part 8A and the other side end part 8B in the center axis direction X of an inside coated member 8 having been folded to an outside direction of one side end part 9A and the other side end part 9B in the center axis direction X of an outer coated member 9. The one side end folded part 15A and the other side end folded part 15B are provided with one side end notched part 17A and the other side end notched part 17B which are notched in the center axis direction X at a part P opposed to the open part 14. An exterior member 10 is provided with a cut-out portion 18 which is formed by cutting and opening at positions of the one side end notched part 17A and the other side end notched part 17B and in a prescribed width L in the center axis direction X.SELECTED DRAWING: Figure 1

Description

この発明は、バンドヒータに係り、被加熱体の周囲に配設されるバンドヒータに関する。 The present invention relates to a band heater and relates to a band heater disposed around a body to be heated.

バンドヒータとしては、例えば、射出成形機の射出ノズルに用いられるものがある。バンドヒータは、被加熱体である射出ノズルの周囲に配設され、射出ノズルの内部の溶融樹脂の保温を行って確実な充填を図るものである。
具体的には、図１０に示すように、射出ノズル１０１は、ノズル軸部１０１Ａとノズル頭部１０１Ｂとから構成される。ノズル軸部１０１Ａの外周面には、軸心方向Ｘに沿って、バンドヒータとして、複数個（例えば、３個）のバンドヒータ１０２・１０２・１０２が並んで配設される。
バンドヒータ１０２は、射出ノズル１０１のノズル軸部１０１Ａの外周面に直接取り付けられる筒状のヒータ本体１０３と、ヒータ本体１０３の外周面を保持して固定するためのバンド本体１０４とを備え、ノズル軸部１０１Ａを加熱する。
ヒータ本体１０３には、図１１に示すように、軸心方向Ｘへ切れ目を入れて開口部１０５が形成されるとともに、内側被覆部材１０６の軸心方向Ｘの一側端部１０６Ａ・他側端部１０６Ｂが外側被覆部材１０７の軸心方向Ｘの一側端部１０７Ａ・他側端部１０７Ｂの外方へ折り返された一側端折返し部１０８Ａ・他側端折返し部１０８Ｂが形成される。
また、ヒータ本体１０３には、最外周部位で、一側端折返し部１０８Ａ・他側端折返し部１０８Ｂに重ならないように、外装部材１０９が設けられる。外装部材１０９は、開口部１０５に対峙する部位Ｐで、スポット溶接などの固定手段Ｓによって外側被覆部材１０７の外周面に固定される。 As the band heater, for example, there is one used for an injection nozzle of an injection molding machine. The band heater is disposed around the injection nozzle, which is a body to be heated, to keep the molten resin in the injection nozzle warm and ensure reliable filling.
Specifically, as shown in FIG. 10, the injection nozzle 101 is composed of a nozzle shaft 101A and a nozzle head 101B. On the outer peripheral surface of the nozzle shaft portion 101A, a plurality of (for example, three) band heaters 102, 102, 102 are arranged side by side along the axial direction X as a band heater.
The band heater 102 includes a tubular heater main body 103 directly attached to the outer peripheral surface of the nozzle shaft portion 101A of the injection nozzle 101, and a band main body 104 for holding and fixing the outer peripheral surface of the heater main body 103. The shaft portion 101A is heated.
As shown in FIG. 11, the heater main body 103 is cut in the axial direction X to form an opening 105, and one end 106A of the axial direction X of the inner covering member 106 and the other end One side end turn back portion 108A and the other side end turn back portion 108B are formed in which the portion 106B is folded outward of the one side end portion 107A and the other side end portion 107B of the outer covering member 107 in the axial direction X.
In addition, the exterior member 109 is provided in the heater main body 103 so as not to overlap the one side end turn back portion 108A and the other side end turn back portion 108B at the outermost peripheral portion. The exterior member 109 is fixed to the outer circumferential surface of the outer covering member 107 by a fixing means S such as spot welding at a portion P facing the opening 105.

特開平８−２８１７５３号公報JP-A-8-281753

ところが、図１０に示すバンドヒータ１０２の射出ノズル１０１への取り付けにあっては、ヒータ本体１０３の外装部材１０９が開口部１０５に対峙する部位Ｐで固定手段Ｓによって外側被覆部材１０７の外周面に固定されたり、ヒータ本体１０３の一側端折返し部１０８Ａ・他側端折返し部１０８Ｂが開口部１０５を除いて連続して形成されていることから、ヒータ本体１０３の変位（弾性変形）の中心となる開口部１０５に対峙する部位Ｐが硬くなって開口部１０５の幅を大きくすることが困難であった。このため、射出ノズル１０１に複数個のバンドヒータ１０２を軸心方向Ｘへ並んで配設する場合に、各ヒータ本体１０３を順次にノズル軸部１０１Ａの先端側から嵌装して取り付ける必要があり、その取付作業が面倒であった。
また、例えば、中間に位置するバンドヒータ１０２が故障した場合に、その故障したバンドヒータ１０２のみを交換するために、先ず、ノズル軸部１０１Ａの先端側のバンドヒータ１０２を取り外してからその故障したバンドヒータ１０２を取り外し、そして、新たなバンドヒータを嵌装して中間の位置に取り付け、その後、取り外された先端側のバンドヒータ１０２を再度嵌装して取り付ける必要があり、このため、その交換作業が面倒であった。 However, when attaching the band heater 102 to the injection nozzle 101 shown in FIG. 10, the outer covering surface of the outer covering member 107 is fixed by the fixing means S at a portion P where the exterior member 109 of the heater main body 103 faces the opening 105. Because it is fixed, and one side end turn back portion 108A and the other side end turn back portion 108B of the heater main body 103 are continuously formed excluding the opening portion 105, the center of the displacement (elastic deformation) of the heater main body 103 The portion P facing the opening 105 is hardened, making it difficult to increase the width of the opening 105. Therefore, when arranging a plurality of band heaters 102 in the axial direction X in the injection nozzle 101, it is necessary to fit each heater main body 103 sequentially from the tip side of the nozzle shaft 101A and attach it. , The installation work was troublesome.
Also, for example, when the band heater 102 located in the middle breaks down, in order to replace only the broken band heater 102, the band heater 102 on the tip end side of the nozzle shaft portion 101A is first removed and then broken down. It is necessary to remove the band heater 102 and insert a new band heater and attach it at an intermediate position, and then reattach and attach the removed distal side band heater 102. The work was troublesome.

そこで、この発明は、被加熱体に対してヒータ本体の着脱を容易とし、取付作業や交換作業を簡便に行わせることができるバンドヒータを提供することを目的とする。 Then, this invention makes it easy to attach or detach a heater main body with respect to a to-be-heated body, and an object of this invention is to provide the band heater which can carry out attachment operation and replacement operation simply.

この発明は、発熱線が重ならないように複数回巻き回された筒状の芯部材と、前記芯部材の内周面を覆う内側絶縁部材と、前記芯部材の外周面を覆う外側絶縁部材と、前記内側絶縁部材の内周面を覆う内側被覆部材と、前記外側絶縁部材の外周面を覆う外側被覆部材と、前記外側被覆部材の外周面を覆う外装部材とから構成されたヒータ本体を備え、前記ヒータ本体には、軸心方向へ切れ目を入れて開口部を形成するとともに、前記内側被覆部材の軸心方向の一側端部・他側端部が前記外側被覆部材の軸心方向の一側端部・他側端部の外方へ折り返された一側端折返し部・他側端折返し部を形成し、前記外装部材が前記一側端折返し部・前記他側端折返し部に重ならないように前記外装部材の軸心方向の幅を前記内側被覆部材・前記外側被覆部材の軸心方向の幅よりも小さく設定したバンドヒータにおいて、前記一側端折返し部・前記他側端折返し部には、前記開口部に対峙する部位で軸心方向へ切り欠いた一側端切欠部・他側端切欠部を形成し、前記外装部材には、前記一側端切欠部・前記他側端切欠部の位置で且つ軸心方向へ所定幅で切り抜いた切抜部を形成したことを特徴とする。 According to the present invention, a cylindrical core member wound a plurality of times so that heating wires do not overlap, an inner insulating member covering the inner peripheral surface of the core member, and an outer insulating member covering the outer peripheral surface of the core member A heater main body including an inner covering member covering an inner peripheral surface of the inner insulating member, an outer covering member covering an outer peripheral surface of the outer insulating member, and an outer covering member covering an outer peripheral surface of the outer covering member; The heater main body is cut in the axial direction to form an opening, and one end and the other end of the inner covering member in the axial direction of the inner covering member are in the axial direction of the outer covering member. One side end and another side end are formed with one side end folded back and another side end folded back, and the exterior member is heavy on the one side end folded back and the other side end folded back Width of the outer covering member in the axial direction so as not to cause the inner covering member and the outer covering In the band heater set to be smaller than the width in the axial direction of the material, one side end notched in the axial direction at a portion facing the opening at the one side end turnback portion and the other side end turnback portion A notch and another side end notch are formed, and the exterior member is formed with a cutout having a predetermined width cut in the axial direction at the position of the one side end notch and the other side end notch. It is characterized by

この発明は、被加熱体にバンドヒータを着脱する際には、開口部に対峙する部位を中心としてヒータ本体を変位（弾性変形）すると、開口部の幅が大きくなるので、被加熱体に対してヒータ本体の着脱を容易とし、よって、バンドヒータの取付作業や交換作業を簡便に行わせることができる。 According to the present invention, when the band heater is attached to and detached from the body to be heated, the width of the opening becomes large when the heater main body is displaced (elastically deformed) centering on the portion facing the opening. As a result, the attachment and detachment of the heater main body can be facilitated, and the attachment work and the replacement work of the band heater can be easily performed.

図１は３個のバンドヒータが取り付けられた射出ノズルの斜視図である。（実施例）FIG. 1 is a perspective view of an injection nozzle to which three band heaters are attached. (Example) 図２はバンドヒータの正面図である。（実施例）FIG. 2 is a front view of the band heater. (Example) 図３はヒータ本体の斜視図である。（実施例）FIG. 3 is a perspective view of the heater body. (Example) 図４はヒータ本体の一部断面斜視図である。（実施例）FIG. 4 is a partial cross-sectional perspective view of the heater main body. (Example) 図５はヒータ本体の一部拡大断面図である。（実施例）FIG. 5 is a partial enlarged cross-sectional view of the heater body. (Example) 図６はバンドヒータの開口部の幅が大きくなった状態の概略正面図である。（実施例）FIG. 6 is a schematic front view of the state in which the width of the opening of the band heater is increased. (Example) 図７はバンド本体の正面図である。（実施例）FIG. 7 is a front view of the band body. (Example) 図８は図７のバンド本体の要部拡大正面図である。（実施例）FIG. 8 is an enlarged front view of the main part of the band main body of FIG. (Example) 図９は図７のバンド本体の側面図である。（実施例）FIG. 9 is a side view of the band body of FIG. 7; (Example) 図１０はバンドヒータが取り付けられた射出ノズルの斜視図である。（従来例）FIG. 10 is a perspective view of an injection nozzle to which a band heater is attached. (Conventional example) 図１１はヒータ本体の斜視図である。（従来例）FIG. 11 is a perspective view of the heater main body. (Conventional example)

この発明は、バンドヒータの取付作業や交換作業を簡便に行わせる目的を、開口部の幅が大きくなるようにヒータ本体を容易に変位（弾性変形）させて実現するものである。 The present invention realizes the purpose of simply performing the attachment work and the replacement work of the band heater by easily displacing (elastically deforming) the heater main body so that the width of the opening becomes large.

図１〜図９は、この発明の実施例を示すものである。
図１に示すように、射出成形機の被加熱体である射出ノズル１は、ノズル軸部１Ａとノズル頭部１Ｂとから構成される。
射出ノズル１には、射出ノズル１の内部の溶融樹脂の保温を行い確実な充填を図るためのバンドヒータとして、複数個（例えば、３個）のバンドヒータ２・２・２が用いられる。バンドヒータ２・２・２は、射出ノズル１のノズル軸部１Ａの外周面に軸心方向Ｘへ順次に並んで配設され、ノズル軸部１Ａを加熱する。 1 to 9 show an embodiment of the present invention.
As shown in FIG. 1, the injection nozzle 1 which is a heated object of an injection molding machine is comprised from the nozzle axial part 1A and the nozzle head 1B.
In the injection nozzle 1, a plurality of (for example, three) band heaters 2 · 2 are used as band heaters for keeping the molten resin in the injection nozzle 1 warm and ensuring filling. The band heaters 2 · 2 · 2 are sequentially arranged in the axial direction X on the outer peripheral surface of the nozzle shaft 1 A of the injection nozzle 1 and heat the nozzle shaft 1 A.

図１、図２に示すように、バンドヒータ２は、ヒータ本体３とバンド本体４とを備える。
図３〜図５に示すように、ヒータ本体３は、芯部材５と、内側絶縁部材６と、外側絶縁部材７と、内側被覆部材８と、外側被覆部材９と、外装部材１０とを備え、それらが密着積層して構成される。ヒータ本体３は、射出ノズル１のノズル軸部１Ａの外周面に直接取り付けられる。
芯部材５は、長方形状のマイカ板（例えば、厚さが０．３５ｍｍ）が筒状になって形成される。マイカ板は、一般的に、耐熱性で電気を通しにくい性質を有し、絶縁体として用いられている。
芯部材５には、図４に示すように、軸心方向（幅方向）Ｘに向かって発熱線１１が重ならないように複数回巻き回されている。発熱線１１は、例えば、ニクロム線などからなる発熱抵抗体である。発熱線１１には、図２に示すように、一端に一側電線１２Ａが接続されるとともに、他端に他側電線１２Ｂが接続される。一側電線１２Ａ・他側電線１２Ｂは、電源に接続される。つまり、電源から一側電線１２Ａ・他側電線１２Ｂを経て供給される電流により、発熱線１１が発熱してヒータ本体３が加熱し、よって、射出ノズル１のノズル軸部１Ａが加熱される。
内側絶縁部材６は、長方形状のマイカ板（例えば、厚さが０．３５ｍｍ）が筒状になって形成され、芯部材５の内周面を覆うものである。
外側絶縁部材７は、長方形状のマイカ板（例えば、厚さが０．３５ｍｍ）が筒状になって形成され、芯部材５の外周面を覆うものである。
内側被覆部材８は、長方形状のステンレス板（ＳＵＳ４３０、例えば、厚さが０．３０ｍｍ）が筒状になって形成され、内側絶縁部材６の内周面を覆うとともに、図２に示すように、内方で射出ノズル１のノズル軸部１Ｂに挿着させるためのノズル挿着孔１３を形成している。
外側被覆部材９は、長方形状のステンレス板（ＳＵＳ４３０、例えば、厚さが０．３０ｍｍ）が筒状になって形成され、外側絶縁部材７の外周面を覆うものである。
外装部材１０は、長方形状のステンレス板（ＳＵＳ４３０、例えば、厚さが０．４０ｍｍ）が筒状になって形成され、外側被覆部材９の外周面を覆うものである。 As shown in FIGS. 1 and 2, the band heater 2 includes a heater main body 3 and a band main body 4.
As shown in FIGS. 3 to 5, the heater main body 3 includes a core member 5, an inner insulating member 6, an outer insulating member 7, an inner covering member 8, an outer covering member 9, and an outer covering member 10. , They are constituted by close contact lamination. The heater body 3 is directly attached to the outer peripheral surface of the nozzle shaft 1A of the injection nozzle 1.
The core member 5 is formed by making a rectangular mica plate (for example, 0.35 mm in thickness) cylindrical. A mica board generally has a property of being heat resistant and difficult to conduct electricity, and is used as an insulator.
As shown in FIG. 4, the core member 5 is wound a plurality of times so that the heating wires 11 do not overlap in the axial direction (width direction) X. The heating wire 11 is, for example, a heating resistor made of a nichrome wire or the like. As shown in FIG. 2, the heating wire 11 is connected to the one-side electric wire 12A at one end, and is connected to the other-side electric wire 12B at the other end. The one side electric wire 12A and the other side electric wire 12B are connected to the power supply. That is, the heating wire 11 generates heat by the current supplied from the power supply through the one side electric wire 12A and the other side electric wire 12B to heat the heater main body 3 and thereby the nozzle shaft portion 1A of the injection nozzle 1 is heated.
The inner insulating member 6 is formed by forming a rectangular mica plate (for example, having a thickness of 0.35 mm) in a cylindrical shape, and covers the inner peripheral surface of the core member 5.
The outer insulating member 7 is formed of a rectangular mica plate (for example, having a thickness of 0.35 mm) in a tubular shape, and covers the outer peripheral surface of the core member 5.
The inner cover member 8 is formed of a rectangular stainless steel plate (SUS 430, for example, 0.30 mm in thickness) in a cylindrical shape and covers the inner peripheral surface of the inner insulating member 6 as shown in FIG. A nozzle insertion hole 13 for inserting the nozzle shaft portion 1B of the injection nozzle 1 is formed on the inner side.
The outer covering member 9 is formed of a rectangular stainless steel plate (SUS 430, for example, 0.30 mm thick) in a tubular shape, and covers the outer peripheral surface of the outer insulating member 7.
The exterior member 10 is formed of a rectangular stainless steel plate (SUS 430, for example, having a thickness of 0.40 mm) in a tubular shape, and covers the outer peripheral surface of the outer covering member 9.

ヒータ本体３には、図３に示すように、軸心方向Ｘへ切れ目を入れて開口部１４が形成される。従って、ヒータ本体３は、開口部１４で切れ目の入った筒状に形成される。開口部１４は、外力が作用していない状態で、所定の幅Ｍになっている。
また、内側被覆部材８の軸心方向（幅方向）Ｘの幅は、外側絶縁部材７の軸心方向Ｘの幅よりも所定に大きく設定されている。そして、ヒータ本体３には、図３〜図５に示すように、内側被覆部材８の軸心方向Ｘの一側端部８Ａ・他側端部８Ｂが外側被覆部材９の軸心方向Ｘの一側端部９Ａ・他側端部９Ｂの外方へ折り返され、一側端折返し部１５Ａ・他側端折返し部１５Ｂが形成される。この場合、図５に示すように、内側被覆部材８の軸心方向Ｘの一側端部８Ａは、芯部材５・内側絶縁部材６・外側絶縁部材７の各一側端部を包囲する。また、図示しないが、内側被覆部材８の軸心方向Ｘの他側端部８Ｂは、芯部材５・内側絶縁部材６・外側絶縁部材７の各他側端部を包囲する。
更に、ヒータ本体３においては、図３に示すように、外装部材１０が一側端折返し部１５Ａ・他側端折返し部１５Ｂに重ならないように、外装部材１０の軸心方向の幅Ｗ１は、ヒータ本体３の軸心方向Ｘの幅Ｗ２よりも小さく設定されている（Ｗ１＜Ｗ２）。
外装部材１０の開口部１４の両側端部位には、図１に示すように、一側電線１２Ａ・他側電線１２Ｂを通過させるための一側切欠溝１６Ａ・他側切欠溝１６Ｂが形成される。 As shown in FIG. 3, the heater main body 3 is cut in the axial direction X to form an opening 14. Therefore, the heater body 3 is formed in a cylindrical shape having a cut at the opening 14. The opening 14 has a predetermined width M when no external force is applied.
The width in the axial direction (width direction) X of the inner covering member 8 is set to be larger than the width in the axial direction X of the outer insulating member 7. Further, as shown in FIGS. 3 to 5, in the heater main body 3, one side end 8 A and the other side end 8 B of the axial center direction X of the inner covering member 8 are in the axial direction X of the outer covering member 9. One side end 9A and the other side end 9B are folded back to form one side end folded portion 15A and the other side end folded portion 15B. In this case, as shown in FIG. 5, one end 8A of the inner covering member 8 in the axial direction X surrounds each one end of the core member 5, the inner insulating member 6, and the outer insulating member 7. Although not shown, the other end 8B of the inner covering member 8 in the axial direction X surrounds each other end of the core member 5, the inner insulating member 6, and the outer insulating member 7.
Furthermore, in the heater main body 3, as shown in FIG. 3, the width W1 in the axial center direction of the exterior member 10 is such that the exterior member 10 does not overlap the one side end turn back portion 15A and the other side end turn back portion 15B The width W2 is smaller than the width W2 in the axial direction X of the heater main body 3 (W1 <W2).
As shown in FIG. 1, one side cutout groove 16A and the other side cutout groove 16B for passing the one side electric wire 12A and the other side electric wire 12B are formed at both end portions of the opening 14 of the exterior member 10 .

この実施例において、図３、図４に示すように、ヒータ本体３の一側端折返し部１５Ａ・他側端折返し部１５Ｂには、開口部１４に対峙する部位Ｐで軸心方向Ｘへ切り欠いた一側端切欠部１７Ａ・他側端切欠部１７Ｂが形成される。
また、外装部材１０には、図３、図４に示すように、一側端切欠部１７Ａ・他側端切欠部１７Ｂの位置で、つまり、開口部１４に対峙する部位Ｐで、且つ軸心方向Ｘへ所定幅Ｌで切り抜いた切抜部１８が形成される。一側端切欠部１７Ａ・他側端切欠部１７Ｂと切抜部１８とは、開口部１４に対峙する部位Ｐで且つ軸心方向Ｘで直線上に位置している。
更に、ヒータ本体３は、図３に示すように、開口部１４に対峙する部位Ｐの厚さＴ１が他の部位の厚さＴ２よりも小さくなるように形成される（Ｔ１＜Ｔ２）。
また、外装部材１０は、開口部１４及び切抜部１８の存在により、一側の一側円弧部１０Ａと他側の他側円弧部１０Ｂとに分離される。一側円弧部１０Ａ・他側円弧部１０Ｂは、図３に示すように、スポット溶接などの固定手段Ｓによって開口部１４に対峙する部位Ｐと直交する方向から外側被覆部材９の外周面にそれぞれ固定される。
従って、図６に示すように、ヒータ本体３は、一側端切欠部１７Ａ・他側端切欠部１７Ｂ及び外装部材１０の切抜部１８が存在する開口部１４に対峙する部位Ｐを中心として、開口部１４が最大幅Ｍｍａｘまで広がるように、開口部１４の両側端部方向へ変位（弾性変形）することが可能となる。 In this embodiment, as shown in FIG. 3 and FIG. 4, the one side end turn back portion 15A and the other side end turn back portion 15B of the heater main body 3 are cut in the axial direction X at a portion P facing the opening portion 14 A missing one side end notch 17A and another side end notch 17B are formed.
In addition, as shown in FIGS. 3 and 4, the exterior member 10 has an axial center at the positions of the one side end notch 17A and the other side end notch 17B, that is, at the portion P facing the opening 14. A cutout 18 cut out with a predetermined width L in the direction X is formed. The one side end notch portion 17A, the other side end portion notch portion 17B, and the cutout portion 18 are positioned in a straight line in the axial direction X at a portion P facing the opening portion 14.
Furthermore, as shown in FIG. 3, the heater body 3 is formed such that the thickness T1 of the portion P facing the opening 14 is smaller than the thickness T2 of the other portion (T1 <T2).
Further, the exterior member 10 is separated into the one side arc portion 10A on one side and the other side arc portion 10B on the other side by the presence of the opening portion 14 and the cutout portion 18. As shown in FIG. 3, the one side arc portion 10A and the other side arc portion 10B are formed on the outer peripheral surface of the outer covering member 9 from the direction orthogonal to the portion P facing the opening 14 by fixing means S such as spot welding. It is fixed.
Therefore, as shown in FIG. 6, the heater main body 3 is centered on a portion P facing the opening 14 where the one side end notch 17A, the other side end notch 17B and the cutout 18 of the exterior member 10 are present. It is possible to displace (elastically deform) in the direction of both ends of the opening 14 so that the opening 14 expands to the maximum width Mmax.

図７〜図９に示すように、バンド本体４は、ヒータ本体３の外周面を保持して固定するためのものである。バンド本体４は、バンド部１９と、一側取付棒２０Ａ・他側取付棒２０Ｂと、締結具２１としてのボルト２２・ナット２３とから構成される。
バンド部１９は、薄いステンレス板が筒状に形成されて内方でヒータ本体取付空間２４を形成するとともに、ヒータ本体３の開口部１４に対峙する部位Ｐで切れ目を入れることにより、バンド側開口部２５を形成している。また、バンド部１９には、バンド側開口部２５に対峙する部位で、つまり、ヒータ本体３の開口部１４が存在する箇所で、一側電線１２Ａ・他側電線１２Ｂを通過させるための電線通過用長穴２６が形成される。電線通過用長穴２６は、長径が軸心方向Ｘと直交する方向へ向かって形成されている。
バンド部１９のバンド側開口部２５の両側端部位の一側端部２７Ａ・他側端部２７Ｂは、内方に折り返されて一側取付棒挿着孔２８Ａ・他側取付棒挿着孔２８Ｂを形成し、スポット溶接などの固定手段Ｓで固定されている。
また、バンド部１９のバンド側開口部２５の両側端部位の一側端部２７Ａ・他側端部２７Ｂには、図９に示すように、一側切欠溝２９Ａ・他側切欠溝２９Ｂが形成される。
一側取付棒２０Ａ・他側取付棒２０Ｂは、円柱状のステンレス材からなり、一側取付棒挿着孔２８Ａ・他側取付棒挿着孔２８Ｂに軸心方向Ｘに向かって挿着される。
一側取付棒２０Ａ・他側取付棒２０Ｂの中間部位には、図８に示すように、軸心方向Ｘと直交する方向でボルト２２の軸部２２Ａを挿通するための一側ボルト貫通孔３０Ａ・他側ボルト貫通孔３０Ｂが形成される。ボルト２２の頭部２２Ｂ・ナット２３は、一側切欠溝２９Ａ・他側切欠溝２９Ｂの箇所に配置される。一側切欠溝２９Ａ・他側切欠溝２９Ｂは、ボルト２２・ナット２３の着脱を容易にするための空間である。
締結具２１においては、ボルト２２は、ステンレス材からなり、頭部２２Ａと外周面にねじが形成された軸部２２Ｂとからなり、軸部２２Ｂの先端側からナット２３が螺着される。ナット２３は、ステンレス材からなる。 As shown in FIGS. 7 to 9, the band main body 4 is for holding and fixing the outer peripheral surface of the heater main body 3. The band main body 4 is composed of a band portion 19, one side attachment bar 20A and the other side attachment bar 20B, and bolts 22 and nuts 23 as the fasteners 21.
The band portion 19 has a thin stainless steel plate formed in a cylindrical shape to form the heater main body mounting space 24 on the inner side, and by making a cut at a portion P facing the opening portion 14 of the heater main body 3, the band side opening The part 25 is formed. Further, in the band portion 19, at a portion facing the band side opening portion 25, that is, at a portion where the opening portion 14 of the heater main body 3 exists, a wire passing for passing the one side electric wire 12A and the other side electric wire 12B. An elongated hole 26 is formed. The wire passage long hole 26 is formed such that its major axis is perpendicular to the axial direction X.
The one side end 27A and the other side 27B of the both side end portions of the band side opening 25 of the band 19 are folded back inward and the one side attachment rod insertion hole 28A and the other side attachment rod insertion hole 28B And fixed by a fixing means S such as spot welding.
Further, as shown in FIG. 9, one side cutout groove 29A and the other side cutout groove 29B are formed on one side end 27A and the other side end 27B of both side end portions of the band side opening 25 of the band 19 Be done.
One side mounting rod 20A and the other side mounting rod 20B are made of cylindrical stainless steel and are inserted in the axial direction X into the one side mounting rod insertion hole 28A and the other side mounting rod insertion hole 28B. .
One side bolt through hole 30A for inserting the shaft portion 22A of the bolt 22 in the direction orthogonal to the axial direction X, as shown in FIG. 8, in the middle part of the one side mounting bar 20A and the other side mounting bar 20B. The other-side bolt through hole 30B is formed. The head 22B and nut 23 of the bolt 22 are disposed at the locations of the one side notch groove 29A and the other side notch groove 29B. The one side notch groove 29A and the other side notch groove 29B are spaces for facilitating the attachment and detachment of the bolt 22 and the nut 23.
In the fastener 21, the bolt 22 is made of stainless steel and includes a head 22A and a shaft 22B having a screw formed on the outer peripheral surface, and the nut 23 is screwed from the tip end of the shaft 22B. The nut 23 is made of stainless steel.

バンドヒータ２においては、図２に示すように、締結具２１であるボルト２２・ナット２３でバンド本体４のバンド部１９を締め付けることにより、ヒータ本体３の開口部１４の幅Ｍが小さくなり、バンド本体１９でヒータ本体３の外周面を保持して固定する。 In the band heater 2, as shown in FIG. 2, the width M of the opening 14 of the heater main body 3 is reduced by tightening the band 19 of the band main body 4 with the bolt 22 and nut 23 which are fasteners 21. The outer peripheral surface of the heater main body 3 is held and fixed by the band main body 19.

次いで、この実施例に係る作用を説明する。
図６に示すように、バンドヒータ２を射出ノズル１のノズル軸部１Ａに取り付ける際には、ノズル軸部１Ａの所定の箇所で、ヒータ本体３の開口部１４の両側端部位を両手で持って広げると、一側端切欠部１７Ａ・他側端切欠部１７Ｂ及び切抜部１８が存在する開口部１４に対峙する部位Ｐを中心としてヒータ本体３が変位し（弾性変形）（図１参照）、開口部１４の幅Ｍが大きくなって最大幅Ｍｍａｘまでになる（図６参照）。
そして、ヒータ本体３のノズル挿着孔１３を射出ノズル１のノズル軸部１Ａの外周面に挿着し、ヒータ本体３の元の形に戻ろうとする弾性力によって開口部１４の幅Ｍが小さくなると、ヒータ本体３が射出ノズル１のノズル軸部１Ａの外周面に取り付けられる。
その後、ヒータ本体３の外周面にバンド本体４を取り付け、バンド本体４を締結具２１で締め付けることにより、バンドヒータ２が射出ノズル１のノズル軸部１Ａに堅固に取り付けられる。
同様な手順で、他の複数個のバンドヒータ２を、射出ノズル１のノズル軸部１Ａの所定箇所に取り付けることができる。
一方、バンドヒータ２を射出ノズル１のノズル軸部１Ａから取り外す際には、先ず、締結具２１を緩めてバンド本体４をヒータ本体３から取り外す。
そして、射出ノズル１のノズル軸部１Ａに取り付けられているヒータ本体３の開口部１４の両側端部位を両手で持って広げると、一側端切欠部１７Ａ・他側端切欠部１７Ｂ及び切抜部１８が存在する開口部１４に対峙する部位Ｐを中心としてヒータ本体３が変位し（弾性変形）（図１参照）、開口部１４の幅Ｍが大きくなって最大幅Ｍｍａｘまでになり（図６参照）、ヒータ本体３を射出ノズル１のノズル軸部１Ａから取り外すことができる。
よって、複数個のバンドヒータ２が射出ノズル１のノズル軸部１Ａの外周面に並んで配設された場合で、例えば、中間のバンドヒータ２が故障した場合には、その故障したバンドヒータ２を隣接するバンドヒータ２とは関係なく取り外す一方、新たなバンドヒータ２を隣接するバンドヒータ２とは関係なく取り付けれることができる。
この結果、被加熱体である射出ノズル１のノズル軸部１Ａに対して複数個のバンドヒータ２を着脱する際には、ヒータ本体３の開口部１４の両側端部位を両手で持って開口部１４の幅Ｍが大きくなるようにヒータ本体３を変位（弾性変形）させることができるので、ヒータ本体３の着脱を簡単とし、従って、複数個のバンドヒータ２が射出ノズル１のノズル軸部１Ａの外周面に並んで配設される場合でも、バンドヒータ２の取付作業や交換作業を簡便に行わせることができる。 Next, the operation of this embodiment will be described.
As shown in FIG. 6, when the band heater 2 is attached to the nozzle shaft 1A of the injection nozzle 1, both end portions of the opening 14 of the heater main body 3 are held by both hands at a predetermined position of the nozzle shaft 1A. Then, the heater body 3 is displaced (elastically deformed) centering on a portion P facing the opening 14 where the one side end notch 17A, the other side end notch 17B and the cutout 18 are present (refer to FIG. 1) The width M of the opening 14 is increased to the maximum width Mmax (see FIG. 6).
Then, the nozzle insertion hole 13 of the heater main body 3 is inserted into the outer peripheral surface of the nozzle shaft portion 1A of the injection nozzle 1, and the width M of the opening 14 is reduced by the elastic force to return to the original shape of the heater main body 3. Then, the heater main body 3 is attached to the outer peripheral surface of the nozzle shaft portion 1A of the injection nozzle 1.
Thereafter, the band main body 4 is attached to the outer peripheral surface of the heater main body 3 and the band main body 4 is tightened by the fastener 21, whereby the band heater 2 is firmly attached to the nozzle shaft portion 1A of the injection nozzle 1.
A plurality of other band heaters 2 can be attached to predetermined positions of the nozzle shaft 1A of the injection nozzle 1 by the same procedure.
On the other hand, when removing the band heater 2 from the nozzle shaft portion 1A of the injection nozzle 1, first, the fastener 21 is loosened and the band main body 4 is removed from the heater main body 3.
Then, when both end portions of the opening 14 of the heater main body 3 attached to the nozzle shaft portion 1A of the injection nozzle 1 are held by both hands and expanded, the one side end cutout 17A, the other side end cutout 17B and the cutout The heater main body 3 is displaced (elastically deformed) (see FIG. 1) centering on the portion P facing the opening 14 where the 18 exists, and the width M of the opening 14 is increased to the maximum width Mmax (FIG. 6) Reference), the heater main body 3 can be removed from the nozzle shaft 1A of the injection nozzle 1.
Therefore, in the case where the plurality of band heaters 2 are arranged side by side on the outer peripheral surface of the nozzle shaft portion 1A of the injection nozzle 1, for example, when the intermediate band heater 2 breaks down, the broken band heater 2 Can be removed independently of the adjacent band heater 2 while a new band heater 2 can be attached independently of the adjacent band heater 2.
As a result, when attaching / removing the plurality of band heaters 2 to / from the nozzle shaft portion 1A of the injection nozzle 1 which is the object to be heated, the both end portions of the opening 14 of the heater main body 3 are held by both hands Since the heater main body 3 can be displaced (elastically deformed) so that the width M of 14 becomes large, attachment and detachment of the heater main body 3 is simplified, and accordingly, the plurality of band heaters 2 is the nozzle shaft portion 1A of the injection nozzle 1 Even when the band heater 2 is disposed side by side on the outer peripheral surface of the case, the attachment work and the replacement work of the band heater 2 can be easily performed.

なお、この実施例においては、ヒータ本体３の開口部１４に対峙する部位Ｐの外周面に、ヒータ本体３が変位し易いように、軸心方向Ｘへ沿った直線状の溝を形成することも可能である。
また、バンドヒータ２を、筒状のみならず、平坦状（展開状態）で使用することも可能である。 In this embodiment, a linear groove along the axial direction X is formed on the outer peripheral surface of the portion P facing the opening 14 of the heater main body 3 so that the heater main body 3 is easily displaced. Is also possible.
Moreover, it is also possible to use the band heater 2 not only in a tubular shape but also in a flat shape (deployed state).

この発明に係るバンドヒータは、射出ノズルのみならず、缶などの他の被加熱体にも適用可能である。 The band heater according to the present invention is applicable not only to the injection nozzle but also to other objects to be heated such as cans.

１射出ノズル
２バンドヒータ
３ヒータ本体
４バンド本体
５芯部材（芯マイカ板）
６内側絶縁部材（絶縁マイカ板）
７外側絶縁部材（絶縁マイカ板）
８内側被覆部材（ステンレス板）
９外側被覆部材（ステンレス板）
１０外装部材（ステンレス板）
１１発熱線（発熱抵抗体）
１２Ａ一側電線
１２Ｂ他側電線
１３ノズル挿着孔
１４開口部
１５Ａ一側端折返し部
１５Ｂ他側端折返し部
１６Ａ一側切欠溝
１６Ｂ他側切欠溝
１７Ａ一側端切欠部
１７Ｂ他側端切欠部
１８切抜部
１９バンド部（ステンレス板）
２０Ａ一側取付棒（ステンレス材）
２０Ｂ他側取付棒（ステンレス材）
２１締結具
２２ボルト（ステンレス材）
２３ナット（ステンレス材）
２４ヒータ本体取付空間 1 injection nozzle 2 band heater 3 heater main body 4 band main body 5 core member (core mica board)
6 Inner insulation member (insulated mica plate)
7 Outer insulating member (insulated mica plate)
8 Inner covering member (stainless steel plate)
9 Outer covering member (stainless steel plate)
10 Exterior member (stainless steel plate)
11 Heating wire (heating resistor)
12A One-side electric wire 12B Other-side electric wire 13 Nozzle insertion hole 14 Opening 15A One-side end folding-back portion 15B Other-side end folding-back portion 16A One-side cutout groove 16B Other-side cutout groove 17A One-side cutout portion 17B Other-side cutout 18 Cut out part 19 Band part (stainless steel plate)
20A One Side Mounting Rod (Stainless Steel)
20B Other side mounting rod (stainless steel)
21 Fastener 22 bolt (stainless material)
23 Nut (stainless steel)
24 Heater body mounting space

Claims

A cylindrical core member wound a plurality of times so that the heating wires do not overlap;
An inner insulating member covering an inner circumferential surface of the core member;
An outer insulating member covering an outer peripheral surface of the core member;
An inner covering member covering an inner circumferential surface of the inner insulating member;
An outer covering member covering an outer peripheral surface of the outer insulating member;
A heater main body configured of an exterior member covering an outer peripheral surface of the outer covering member;
The heater main body is cut in the axial direction to form an opening, and one end and the other end of the inner covering member in the axial direction are ones of the axial direction of the outer covering member. Forming one side end turnaround portion and the other side end turnaround portion that are folded outward of the side end portion and the other side end portion,
The width in the axial direction of the outer covering member is smaller than the width in the axial direction of the inner covering member and the outer covering member so that the outer covering member does not overlap with the one side end turning back portion and the other side end turning back portion. In the set band heater,
In the one side end turnback portion and the other side end turnback portion, one side end notch portion and the other side end notch portion cut in the axial direction at a portion facing the opening are formed.
A band heater characterized in that the exterior member is formed with a cutout cut out at a predetermined width in the axial direction at the position of the one side end cutout portion and the other side end cutout portion.

The band heater according to claim 1, wherein the heater body is formed such that a thickness of a portion facing the opening is smaller than a thickness of another portion.