JPS6227332Y2 - - Google Patents
Info
- Publication number
- JPS6227332Y2 JPS6227332Y2 JP775382U JP775382U JPS6227332Y2 JP S6227332 Y2 JPS6227332 Y2 JP S6227332Y2 JP 775382 U JP775382 U JP 775382U JP 775382 U JP775382 U JP 775382U JP S6227332 Y2 JPS6227332 Y2 JP S6227332Y2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- circuit
- electrode
- safety device
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000003466 welding Methods 0.000 claims description 49
- 238000001514 detection method Methods 0.000 claims description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Arc Welding Control (AREA)
Description
【考案の詳細な説明】
この考案は自動溶接機の安全装置の改良に関す
る。[Detailed Description of the Invention] This invention relates to an improvement of a safety device for an automatic welding machine.
最近では、自動溶接機として工業用ロボツトが
多く使用されている。ロボツトにより自動溶接を
行なう場合、被溶接物自体の組み立て精度やロボ
ツトの位置決め精度等により、予めプログラムし
た溶接線データに基づく軌跡と、実動作の軌跡と
の間に誤差を生じることがある。この誤差が生じ
ると、溶接トーチが被溶接物に接触したり、衝突
して、ロボツトのトーチ支持部を損傷してしま
う。損傷を防止する安全装置が必要となる。安全
装置には、溶接トーチが被溶接物に接触した時点
で接触検知信号を発し、ロボツトの動作を停止さ
せるようにするものが適している。この種の安全
装置として、特公昭52−40905号公報の『溶接機
の安全装置』が知られている。この公知発明は、
「溶接電源電圧を印加された電極部を包囲し、か
つ該電極部と電気的に絶縁されて溶接トーチ先端
部に装着された導電体のリングと、該リングに溶
接電源電圧及び被溶接物の電圧と異なる電圧を印
加する装置と、前記リングが前記電極又は前記被
溶接物と電気的に接触したとき生ずる該リング電
圧の変化のそれぞれを検出する検出装置と、前記
検出装置からの信号に応じ前記リングが前記電極
と短絡したこと及び該リングが被溶接物と接触し
たことを警報する事故信号を発生する装置とを包
含すること」を要旨とするものである。しかし、
上記要旨からも明らかなように、電極部を包囲す
る導電性リングに別途電圧印加装置を接続しなけ
ればならず、そのうえ、検出の仕方も複雑であ
る。 Recently, industrial robots are often used as automatic welding machines. When automatic welding is performed by a robot, an error may occur between the trajectory based on pre-programmed welding line data and the trajectory of actual operation due to the assembly accuracy of the workpiece itself, the positioning accuracy of the robot, etc. If this error occurs, the welding torch may come into contact with or collide with the object to be welded, damaging the torch support portion of the robot. Safety devices are required to prevent damage. A suitable safety device is one that issues a contact detection signal when the welding torch comes into contact with the object to be welded, and stops the operation of the robot. As this type of safety device, "Safety device for welding machine" disclosed in Japanese Patent Publication No. 52-40905 is known. This known invention is
``A conductor ring that surrounds the electrode section to which welding power supply voltage is applied, is electrically insulated from the electrode section, and is attached to the tip of the welding torch, and the ring is connected to the welding power source voltage and the object to be welded. a device that applies a voltage different from the voltage; a detection device that detects each change in the ring voltage that occurs when the ring comes into electrical contact with the electrode or the object to be welded; and a detection device that responds to a signal from the detection device. and a device that generates an accident signal to warn that the ring has short-circuited with the electrode and that the ring has come into contact with a workpiece to be welded. but,
As is clear from the above summary, a separate voltage application device must be connected to the conductive ring surrounding the electrode portion, and the detection method is also complicated.
そこで、この考案の目的は、より簡易に構成す
るとともに、検出の仕方も簡単な自動溶接機の安
全装置を提供することである。 Therefore, the purpose of this invention is to provide a safety device for an automatic welding machine that has a simpler structure and a simple detection method.
この考案を要約すれば、溶接電源を接続した電
極部と、該電極部とは電気的に絶縁され、溶接ト
ーチ先端部に装着される導電性円筒状体との間
に、電流検出手段を含む開いた回路を接続し、前
記円筒状体が被溶接物に接触したときのみ前記回
路が閉じ前記溶接電源から電流が供給されて前記
電流検出手段より接触検出信号を出力するように
した安全装置である。 To summarize this invention, current detection means is included between an electrode part connected to a welding power source and a conductive cylindrical body that is electrically insulated from the electrode part and attached to the tip of the welding torch. A safety device in which an open circuit is connected and the circuit is closed only when the cylindrical body contacts the workpiece to be welded, and current is supplied from the welding power source and a contact detection signal is output from the current detection means. be.
以下、この考案を図示の実施例に基づいて説明
する。なお、実施例は、炭酸ガスアーク溶接又は
MIG溶接のような消耗性電極を用いるアーク溶接
を工業用ロボツトを使用して自動的に実施する場
合である。 This invention will be explained below based on illustrated embodiments. In addition, the examples are carbon dioxide gas arc welding or
This is a case where arc welding using a consumable electrode such as MIG welding is automatically performed using an industrial robot.
図面は、本考案の安全装置に使用される検出回
路１を示す。２は溶接トーチの先端部、３は溶接
電源、４は被溶接物である。 The drawing shows a detection circuit 1 used in the safety device of the invention. 2 is a tip of a welding torch, 3 is a welding power source, and 4 is an object to be welded.
溶接トーチ先端部２において、５はコンタクト
チツプであり、溶接ワイヤ６に給電するためトー
チに内蔵したコンタクトチユーブ（図示せず）の
先端に交換可能に装着されている。このコンタク
トチツプ５は、ワイヤリール７から送給モータ８
により連続的に送られる溶接ワイヤ６を保持す
る。該ワイヤ６及びコンタクトチツプ５は溶接電
源３を印加する電極部を構成している。９は溶接
トーチ先端部に装着され、前記コンタクトチツプ
５の周囲をカバーするシールドノズルであり、円
筒状の金属からなる。このシールドノズル９は、
電極部即ち前記コンタクトチツプ５及びワイヤ６
とは電気的に絶縁されている。アーク溶接の際に
は、溶融金属を外気からシールドするため、シー
ルドガスを溶接部に吹きつけるが、シールドガス
は図中矢印１０に沿つて図示しないガス供給源か
ら供給され、前記シールドノズル９と電極部（コ
ンタクトチツプ５）との間を通して吹きつけてい
る。 In the welding torch tip 2, a contact tip 5 is replaceably attached to the tip of a contact tube (not shown) built into the torch for supplying power to the welding wire 6. This contact chip 5 is connected to a feed motor 8 from a wire reel 7.
The welding wire 6 is held continuously by the welding wire 6. The wire 6 and the contact tip 5 constitute an electrode section to which the welding power source 3 is applied. A shield nozzle 9 is attached to the tip of the welding torch and covers the periphery of the contact tip 5, and is made of cylindrical metal. This shield nozzle 9 is
Electrode portion, i.e. the contact chip 5 and wire 6
is electrically isolated from the During arc welding, a shielding gas is sprayed onto the welding part in order to shield the molten metal from the outside air. The shielding gas is supplied from a gas supply source (not shown) along the arrow 10 in the figure, and is connected to the shielding nozzle 9. It is sprayed through the gap between the electrode part (contact tip 5).
電気的には、前記電極部に溶接電源３の正端子
を接続し、被溶接物４に溶接電源３の負端子を接
続しており、通常、このMIG溶接や炭酸ガスアー
ク溶接では、ワイヤ６と被溶接物４との間に18〜
40V程度の溶接電圧が印加される。 Electrically, the positive terminal of the welding power source 3 is connected to the electrode part, and the negative terminal of the welding power source 3 is connected to the workpiece 4. Usually, in this MIG welding or carbon dioxide gas arc welding, the wire 6 and 18~ between workpiece 4
A welding voltage of about 40V is applied.
一方、検出回路１は、回路を構成する接続線の
一端を前記電極部（コンタクトチツプ５）に接続
し、他端を前記導電性のシールドノズル９に接続
しており、回路中に、電流検出手段としての電流
リレー１１を含む。この検出回路１は、電極部と
シールドノズル９との間が絶縁されているので、
常時は電流が流れない開いた回路を構成してい
る。 On the other hand, the detection circuit 1 has one end of the connecting wire constituting the circuit connected to the electrode part (contact chip 5) and the other end connected to the conductive shield nozzle 9. It includes a current relay 11 as a means. In this detection circuit 1, the electrode part and the shield nozzle 9 are insulated, so
It forms an open circuit in which no current flows at all times.
シールドノズル９が被溶接物４に接触すると、
検出回路１が閉じ、溶接電源３の溶接電圧が印加
され、検出回路に電流が流れる。この電流により
リレー１１が動作し、その常開接点１２を閉じ
る。接点閉の信号は、ロボツトの制御装置に入力
され、ロボツトを停止させるか又は所定の退避位
置に移行させる。 When the shield nozzle 9 comes into contact with the workpiece 4,
The detection circuit 1 is closed, the welding voltage of the welding power source 3 is applied, and current flows through the detection circuit. This current operates relay 11, closing its normally open contacts 12. The contact closing signal is input to the robot control device to stop the robot or move it to a predetermined retracted position.
ところで、溶接時には溶接電源３の溶接電圧が
条件によつて大きく変化する。そこで、前記電流
リレー１１は、最低の電圧においても動作し、逆
に無負荷時の最高電圧でも焼損しないようにする
必要がある。この必要性のため、電流リレー１１
には定格電圧DC5〜6Vのものが好ましく、さら
に、無負荷時にも耐えうるように、リレー１１と
並列にツエナーダイオード１３を接続するととも
に該ツエナーダイオード１３のカソードと電極部
との間に抵抗器１４を接続するようにしている。
この定電圧手段を設けることにより、リレー１１
は溶接中の低い電圧（約8V）から、無負荷時の
高い電圧（約90V）まで使用できる。 By the way, during welding, the welding voltage of the welding power source 3 changes greatly depending on conditions. Therefore, it is necessary for the current relay 11 to operate even at the lowest voltage and not to burn out even at the highest voltage under no load. Because of this need, the current relay 11
It is preferable to use a rated voltage of 5 to 6 V DC.Furthermore, a Zener diode 13 is connected in parallel with the relay 11, and a resistor is connected between the cathode of the Zener diode 13 and the electrode part so that it can withstand even when there is no load. I am trying to connect 14.
By providing this constant voltage means, the relay 11
can be used from low voltage (approximately 8V) during welding to high voltage (approximately 90V) when no load is applied.
なお、電流検出手段は、上記のような有接点電
磁リレー１１以外にも、無接点リレーたとえば電
子スイツチング素子のトランジスタ等でもよい。 In addition to the above-mentioned contact electromagnetic relay 11, the current detection means may be a non-contact relay, such as a transistor of an electronic switching element, or the like.
また、上記実施例では、消耗性電極を用いる
MIG溶接又は炭酸ガスアーク溶接の場合を示した
が、非消耗性電極たとえばタングステン電極を用
いかつシールドガスでシールドしながら行なう
TIG溶接でも、同様な検出回路により安全装置を
構成することができる。タングステン電極と被溶
接物間には９〜13V程度の電圧が印加されてお
り、電極部としてのタングステン電極とシールド
ノズル間に流れる電流を検出し、接触検知信号に
より安全を確保するものである。 Further, in the above embodiment, a consumable electrode is used.
The case of MIG welding or carbon dioxide arc welding is shown, but it can also be performed using a non-consumable electrode such as a tungsten electrode and shielding with shielding gas.
A similar detection circuit can be used as a safety device for TIG welding. A voltage of about 9 to 13 V is applied between the tungsten electrode and the workpiece, and the current flowing between the tungsten electrode and the shield nozzle is detected, and safety is ensured by a contact detection signal.
以上のように、この考案によれば、電極部を包
囲する導電性円筒状体と被溶接物との接触を、溶
接電圧を利用しかつ接触時にのみ流れる電流を検
知するようにしたので、従来例のような検知のた
めの独立した電源を必要とせずかつ検知の仕方も
極めて簡単となる効果がある。 As described above, according to this invention, the contact between the conductive cylindrical body surrounding the electrode part and the workpiece is detected by using the welding voltage and by detecting the current flowing only at the time of contact. This has the effect that an independent power source for detection as in the example is not required and the method of detection is extremely simple.
図面は本考案の一実施例としての安全装置に係
る検出回路図である。
１……検出回路、３……溶接電源、５……コン
タクトチツプ、６……溶接ワイヤ、９……シール
ドノズル、１１……電流リレー。
The drawing is a detection circuit diagram of a safety device as an embodiment of the present invention. 1... Detection circuit, 3... Welding power source, 5... Contact chip, 6... Welding wire, 9... Shield nozzle, 11... Current relay.
Claims (1)
極部と電気的に絶縁されて溶接トーチの先端部
に装着される導電性円筒体と、被溶接物との接
触を検出する検出回路を備える自動溶接機の安
全装置において、 前記検出回路は、回路接続線の一端を前記導
電性円筒体に接続する一方、他端を前記電極部
に接続し、前記回路接続線の一端と他端との間
に少なくとも電流検出手段を接続してなる開い
た回路であることを特徴とする自動溶接機の安
全装置。 (2) 前記検出回路には、さらに、前記電流検出手
段と並列に接続された定電圧回路手段を備える
実用新案登録請求の範囲第(1)項記載の自動溶接
機の安全装置。[Claims for Utility Model Registration] (1) A conductive cylindrical body that surrounds an electrode connected to a welding power source, is electrically insulated from the electrode, and is attached to the tip of a welding torch, and an object to be welded. In a safety device for an automatic welding machine, the detection circuit includes one end of a circuit connection line connected to the conductive cylinder, the other end connected to the electrode part, and the detection circuit connected to the conductive cylinder at one end, A safety device for an automatic welding machine, characterized in that the circuit is an open circuit with at least current detection means connected between one end and the other end of a circuit connection line. (2) The safety device for an automatic welding machine according to claim (1), wherein the detection circuit further includes constant voltage circuit means connected in parallel with the current detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP775382U JPS58111172U (en) | 1982-01-21 | 1982-01-21 | Automatic welding machine safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP775382U JPS58111172U (en) | 1982-01-21 | 1982-01-21 | Automatic welding machine safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58111172U JPS58111172U (en) | 1983-07-29 |
| JPS6227332Y2 true JPS6227332Y2 (en) | 1987-07-13 |
Family
ID=30020488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP775382U Granted JPS58111172U (en) | 1982-01-21 | 1982-01-21 | Automatic welding machine safety device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58111172U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4008471A1 (en) * | 2020-12-02 | 2022-06-08 | Fronius International GmbH | Method of and device for welding with detection of electric contacts during a welding process |
-
1982
- 1982-01-21 JP JP775382U patent/JPS58111172U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58111172U (en) | 1983-07-29 |
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