JP7146570B2

JP7146570B2 - Mounting structure of laser light detection sensor to protective window in machine tool

Info

Publication number: JP7146570B2
Application number: JP2018201111A
Authority: JP
Inventors: 芳雄中務
Original assignee: Okuma Corp
Current assignee: Okuma Corp
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2022-10-04
Anticipated expiration: 2038-10-25
Also published as: JP2020066032A

Description

本発明は、レーザ加工が可能な工作機械において、カバーに設けられる保護窓にレーザ光検知センサを取り付ける構造に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a laser light detection sensor to a protective window provided in a cover of a machine tool capable of laser processing.

レーザ加工ユニット等を備えて金属積層や焼入れ等のレーザ加工が可能な工作機械（例えば特許文献１参照）では、工作機械からのレーザ光の漏洩を検知するレーザ光検知センサが設けられる。このレーザ光検知センサの取付構造の一例を図３に示す。ここでは所定の空間を隔てた２枚の板金３１Ａ，３１Ｂからなるカバー３０の外側に、レーザ光検知センサ１をボルト３で固定し、レーザ光検知センサ１の中央に設けた受光部２を外側の板金３１Ｂを貫通させて空間内に突出させている。
このレーザ光検知センサ１には、正常に動作しているか否かを確認するために、動作確認テスタ１０が設けられている。この動作確認テスタ１０は、レーザ光検知センサ１を外側から貫通して保持されて、テスト光の発光部１１を外側の板金３１Ｂ越しにカバー３０内の空間に臨ませた状態で取り付けられる。よって、図示しないテストボタンの操作により発光部１１から照射されたテスト光Ｌは、矢印に示すようにカバー３０内で反射を繰り返し、その反射光Ｌ’が受光部２に到達するため、レーザ光検知センサ１の動作確認を行うことができる。 2. Description of the Related Art A machine tool equipped with a laser processing unit or the like and capable of performing laser processing such as metal lamination or quenching (see, for example, Patent Document 1) is provided with a laser light detection sensor that detects leakage of laser light from the machine tool. An example of the mounting structure of this laser light detection sensor is shown in FIG. Here, the laser beam detection sensor 1 is fixed with bolts 3 to the outside of a cover 30 made up of two sheet metals 31A and 31B separated by a predetermined space, and the light receiving part 2 provided in the center of the laser beam detection sensor 1 is attached to the outside. The sheet metal 31B is penetrated and protruded into the space.
This laser beam detection sensor 1 is provided with an operation check tester 10 for checking whether it is operating normally. This operation confirmation tester 10 is held by penetrating the laser light detection sensor 1 from the outside, and is attached in a state in which the test light emitting part 11 faces the space inside the cover 30 through the outer sheet metal 31B. Therefore, the test light L emitted from the light emitting unit 11 by operating a test button (not shown) is repeatedly reflected within the cover 30 as indicated by the arrow, and the reflected light L' reaches the light receiving unit 2, so that the laser beam The operation of the detection sensor 1 can be checked.

特開２０１８－７９５４０号公報JP 2018-79540 A

一方、図４に示すように、レーザ光検知センサ１が、半透明のアクリル板等からなる前後２枚の保護層２１Ａ，２１Ｂと、両保護層２１Ａ，２１Ｂ間に挟まれて透明なアクリル板等からなる中間層２２とからなる３層構造の保護窓２０にボルト３で取り付けられる場合、ここでは受光部２の位置を内側の保護層２１Ａに合わせるために、外側の保護層２１Ｂとレーザ光検知センサ１との間に板状のスペーサ４が介在され、内側の保護層２１Ａの内側には、ボルト３をねじ込むための取付板５が設けられる。
この取付構造の場合、図５に示すようにボルト３の位置に動作確認テスタ１０を取り付けても、保護窓２０内には発光部１１からのテスト光Ｌが反射して受光部２まで伝播する空間がないため、レーザ光検知センサ１の動作確認を行うことができなくなってしまう。 On the other hand, as shown in FIG. 4, the laser beam detection sensor 1 has two front and rear protective layers 21A and 21B made of translucent acrylic plates or the like, and a transparent acrylic plate sandwiched between the protective layers 21A and 21B. When it is attached to the protective window 20 having a three-layer structure consisting of an intermediate layer 22 made of, etc., with bolts 3, in order to align the position of the light receiving section 2 with the inner protective layer 21A, the outer protective layer 21B and laser light A plate-like spacer 4 is interposed between the detection sensor 1 and a mounting plate 5 for screwing the bolt 3 inside the inner protective layer 21A.
In the case of this mounting structure, even if the operation check tester 10 is mounted at the position of the bolt 3 as shown in FIG. Since there is no space, it becomes impossible to check the operation of the laser light detection sensor 1 .

そこで、本発明は、内部にテスト光の伝播空間がない保護窓であっても動作確認テスタを取り付けてレーザ光検知センサの動作確認を行うことができる工作機械における保護窓へのレーザ光検知センサの取付構造を提供することを目的としたものである。 Therefore, the present invention provides a laser beam detection sensor for a protective window in a machine tool, which can be attached with an operation check tester to check the operation of the laser beam detection sensor even if the protective window does not have a test light propagation space inside. The purpose is to provide a mounting structure for

上記目的を達成するために、請求項１に記載の発明は、工作機械のカバーに設けた保護窓に、テスト光の発光部を有する動作確認テスタを設けたレーザ光検知センサを取り付けるための構造であって、
前記保護窓と前記レーザ光検知センサとの間にスペーサを介在させると共に、前記スペーサの内部に、当該介在状態で前記動作確認テスタの前記発光部からのテスト光が前記レーザ光検知センサの受光部に到達可能な伝播空間を形成していることを特徴とする。
請求項２に記載の発明は、請求項１の構成において、前記スペーサは、前記介在状態で前記発光部と前記受光部とを囲んで前記伝播空間を形成する枠体であることを特徴とする。
請求項３に記載の発明は、請求項２の構成において、前記スペーサの内側には、前記保護窓へ前記レーザ光検知センサを取り付けるためのボルトの貫通部が複数形成され、前記発光部は前記ボルトに代えて何れかの前記貫通部に合わせて配置されることを特徴とする。
In order to achieve the above object, the invention according to claim 1 provides a structure for attaching a laser light detection sensor provided with an operation confirmation tester having a test light emitting part to a protective window provided in a cover of a machine tool. and
A spacer is interposed between the protective window and the laser beam detection sensor, and the test light emitted from the light emitting portion of the operation confirmation tester is emitted to the light receiving portion of the laser beam detection sensor in the interposed state inside the spacer. characterized by forming a propagation space that can reach
The invention according to claim 2 is characterized in that, in the configuration according to claim 1, the spacer is a frame surrounding the light-emitting part and the light-receiving part in the intervening state to form the propagation space. .
According to a third aspect of the present invention, in the configuration of the second aspect, a plurality of through portions for bolts for attaching the laser light detection sensor to the protective window are formed inside the spacer, and the light emitting portion is the light emitting portion. It is characterized in that it is arranged according to any of the through portions instead of the bolt.

本発明によれば、動作確認テスタの発光部からのテスト光がレーザ光検知センサの受光部に到達可能な伝播空間を内部に形成するスペーサの採用により、内部にテスト光の伝播空間がない保護窓であっても動作確認テスタを取り付けてレーザ光検知センサの動作確認を行うことができる。 According to the present invention, by adopting a spacer that forms a propagation space inside which the test light from the light emitting part of the operation confirmation tester can reach the light receiving part of the laser light detection sensor, there is no propagation space for the test light inside. Even if it is a window, it is possible to attach an operation confirmation tester to check the operation of the laser light detection sensor.

保護窓にレーザ光検知センサを取り付けた構造を示す説明図である。It is explanatory drawing which shows the structure which attached the laser beam detection sensor to the protective window. 図１のＡ－Ａ線断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; 従来のカバーにレーザ光検知センサを取り付けた構造を示す説明図である。It is explanatory drawing which shows the structure which attached the laser beam detection sensor to the conventional cover. 保護窓にレーザ光検知センサを取り付けた構造を示す説明図である。It is explanatory drawing which shows the structure which attached the laser beam detection sensor to the protective window. 図４のレーザ光検知センサに動作確認テスタを取り付けた状態の説明図である。5 is an explanatory diagram of a state in which an operation check tester is attached to the laser light detection sensor of FIG. 4; FIG.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、図４に示した保護窓２０へレーザ光検知センサ１を取り付けた構造の一例を示す説明図で、保護窓２０及びレーザ光検知センサ１等の構成は図４，５と同じであるため、同じ構成部には同じ符号を付して重複する説明を省略する。
ここでは外側の保護層２１Ｂとレーザ光検知センサ１との間に設けられるスペーサの構造が図４，５とは異なっている。このレーザ光検知センサ取付用スペーサとしてのスペーサ６は、図２に示すように、内側が中空となる横長矩形状の枠体で、内側の四隅には、４本のボルト３，３・・を位置決めして貫通させるための円形状の貫通部７，７・・が、内側の空間との連通状態で形成されている。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing an example of the structure in which the laser beam detection sensor 1 is attached to the protection window 20 shown in FIG. Therefore, the same components are denoted by the same reference numerals, and overlapping descriptions are omitted.
Here, the structure of the spacer provided between the outer protective layer 21B and the laser light detection sensor 1 is different from that shown in FIGS. As shown in FIG. 2, the spacer 6 as a spacer for attaching the laser light detection sensor is a horizontally long rectangular frame with a hollow inside, and four bolts 3, 3, . . . Circular penetrating portions 7, 7, . . . for positioning and penetrating are formed in communication with the inner space.

この取付構造においては、何れか１つの貫通部７の位置に、ボルト３に代えて動作確認テスタ１０を取り付けて、発光部１１を貫通部７に臨ませている。これによりスペーサ６内で発光部１１と受光部２とが連通し、スペーサ６内には、発光部１１からのテスト光Ｌが矢印で示すように反射を繰り返し、その反射光Ｌ’が受光部２に到達できる伝播空間Ｓが形成される。 In this mounting structure, an operation confirmation tester 10 is attached to one of the penetrating portions 7 in place of the bolt 3 , and the light emitting portion 11 faces the penetrating portion 7 . As a result, the light-emitting portion 11 and the light-receiving portion 2 are communicated within the spacer 6, and the test light L from the light-emitting portion 11 is repeatedly reflected within the spacer 6 as indicated by the arrow, and the reflected light L' is reflected by the light-receiving portion. 2 is formed.

このように、上記形態のレーザ光検知センサ１の取付構造及びスペーサ６によれば、スペーサ６の内部に、保護窓２０とレーザ光検知センサ１との間への介在状態で動作確認テスタ１０の発光部１１からのテスト光Ｌがレーザ光検知センサ１の受光部２に到達可能な伝播空間Ｓを形成しているので、内部にテスト光Ｌの伝播空間がない保護窓２０であっても動作確認テスタ１０を取り付けてレーザ光検知センサ１の動作確認を行うことができる。 As described above, according to the mounting structure of the laser beam detection sensor 1 and the spacer 6 of the above-described embodiment, the operation confirmation tester 10 is placed inside the spacer 6 in a state interposed between the protective window 20 and the laser beam detection sensor 1. Since the test light L from the light emitting part 11 forms the propagation space S that can reach the light receiving part 2 of the laser light detection sensor 1, even the protective window 20 having no propagation space for the test light L can be operated. The confirmation tester 10 can be attached to confirm the operation of the laser light detection sensor 1 .

特にここでは、スペーサ６を、保護窓２０とレーザ光検知センサ１との間への介在状態で発光部１１と受光部２とを囲んで伝播空間Ｓを形成する枠体としているので、スペーサ６の取付と共に伝播空間Ｓを簡単に形成することができる。
また、スペーサ６の内側には、保護窓２０へレーザ光検知センサ１を取り付けるためのボルト３の貫通部７が複数形成され、発光部１１はボルト３に代えて何れかの貫通部７に合わせて配置されるので、貫通部７を利用して発光部１１を容易に位置決め可能となる。 In particular, here, the spacer 6 is a frame that surrounds the light-emitting portion 11 and the light-receiving portion 2 in a state interposed between the protective window 20 and the laser light detection sensor 1 to form the propagation space S. , the propagation space S can be easily formed.
In addition, inside the spacer 6, a plurality of through portions 7 for bolts 3 for attaching the laser light detection sensor 1 to the protective window 20 are formed. Therefore, the light-emitting portion 11 can be easily positioned using the through portion 7 .

なお、スペーサに設けた貫通部への動作確認テスタの取り付け位置は上記形態に限らず、他の貫通部を利用してもよい。また、貫通部を利用せずに受光部と連通する位置へ動作確認テスタを取り付けることもできる。
スペーサの形状も、伝播空間は内側に広く取る形態に限らず、少なくとも動作確認テスタの発光部とレーザ光検知センサの受光部とを連通させる空間が内部に形成されていれば、伝播空間は上記形態より小さくしてもよい。また、スペーサの厚み方向に貫通する伝播空間でなく、片面に形成した凹部で発光部と受光部とを連通させる伝播空間を形成することもできる。スペーサの外形状も矩形状以外に円形状等の他の形状も採用できる。
さらに、保護窓の構造も上記形態に限らず、２層構造や４層構造等であっても本発明の取付構造及びスペーサの採用は可能である。 Note that the mounting position of the operation check tester to the through portion provided in the spacer is not limited to the above embodiment, and other through portions may be used. Also, the operation check tester can be attached to a position communicating with the light-receiving part without using the penetrating part.
The shape of the spacer is not limited to the form in which the propagation space is wide inside, and the propagation space is the above as long as at least a space for communicating the light emitting part of the operation check tester and the light receiving part of the laser light detection sensor is formed inside. It may be smaller than the form. Further, instead of the propagation space penetrating the spacer in the thickness direction, it is possible to form a propagation space that communicates the light emitting portion and the light receiving portion with a concave portion formed on one side. Other shapes such as a circular shape can also be adopted for the outer shape of the spacer, in addition to the rectangular shape.
Furthermore, the structure of the protective window is not limited to the above-described form, and the attachment structure and spacer of the present invention can be employed even in a two-layer structure, a four-layer structure, or the like.

１・・レーザ光検知センサ、２・・受光部、３・・ボルト、６・・スペーサ、７・・貫通部、１０・・動作確認テスタ、１１・・発光部、２０・・保護窓、２１Ａ，２１Ｂ・・保護層、２２・・中間層、３０・・カバー、Ｌ・・テスト光、Ｌ’・・反射光、Ｓ・・伝播空間。 DESCRIPTION OF SYMBOLS 1... Laser beam detection sensor, 2. , 21B... Protective layer, 22... Intermediate layer, 30... Cover, L... Test light, L'... Reflected light, S... Propagation space.

Claims

A structure for attaching a laser light detection sensor provided with an operation confirmation tester having a test light emitting part in a protective window provided in a machine tool cover,
A spacer is interposed between the protective window and the laser beam detection sensor, and the test light emitted from the light emitting portion of the operation confirmation tester is emitted to the light receiving portion of the laser beam detection sensor in the interposed state inside the spacer. A mounting structure of a laser light detection sensor to a protective window in a machine tool, characterized in that a propagation space is formed that can reach the.

2. The laser beam detection to the protective window in the machine tool according to claim 1, wherein the spacer is a frame surrounding the light emitting portion and the light receiving portion in the interposed state to form the propagation space. Sensor mounting structure.

Inside the spacer, a plurality of through portions for bolts for attaching the laser light detection sensor to the protective window are formed, and the light emitting portion is arranged in alignment with any of the through portions instead of the bolts. 3. The mounting structure of the laser light detection sensor to the protective window in the machine tool according to claim 2.