JPS59127977A - Ground fault detecting device of circuit for gun having built-in transformer - Google Patents
Ground fault detecting device of circuit for gun having built-in transformerInfo
- Publication number
- JPS59127977A JPS59127977A JP315483A JP315483A JPS59127977A JP S59127977 A JPS59127977 A JP S59127977A JP 315483 A JP315483 A JP 315483A JP 315483 A JP315483 A JP 315483A JP S59127977 A JPS59127977 A JP S59127977A
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- gun
- built
- cable
- welding
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 claims abstract description 32
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 230000015556 catabolic process Effects 0.000 claims description 5
- 241000270708 Testudinidae Species 0.000 claims 1
- 239000004020 conductor Substances 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003287 bathing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/256—Monitoring devices using digital means the measured parameter being the inter-electrode electrical resistance
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、スポット溶接用ロボットなどの自動スポット
溶接装置における地絡検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground fault detection device in an automatic spot welding device such as a spot welding robot.
スポット浴接用ロボットは自動車ボディの組立ラインを
始め多くの溶接作業に利用されていることは衆知の狙り
であるか、近年スポット溶接の省エネルギ一対策及び浴
接電流（ロ）路用水冷ケーブルの損耗対重として溶接ト
ランスとスポット溶接用ヘットとを一体に絹込んだいわ
ゆるトランス内蔵ガンの使用か増加しつつある。It is widely known that spot bath welding robots are used in many welding operations, including automobile body assembly lines, and in recent years, energy saving measures for spot welding and water cooling for bath welding current (b) paths have been developed. To prevent cable wear and tear, the use of so-called transformer-built-in guns, in which a welding transformer and a spot welding head are integrated, is increasing.
従来は、ロボット・アームの先端に取付られたスポット
溶接ガンへの溶接電流の供給は、天井に吊下けられた大
形の浴接トランスから大きな断面槓紮もった長い水冷式
ケーブルによ−り行なわれていた。従って、ロボットは
この太いケーブルを振り１わして商運で移動することに
なり、又、各溶接打点ごとにおける溶接ガンの姿勢制御
のためケーブルに急激なひねりや曲けを受けることにな
り、ケーブルは一柚の消耗品と化して来た。Conventionally, welding current was supplied to the spot welding gun attached to the tip of the robot arm by a long water-cooled cable with a large cross-section from a large bath transformer suspended from the ceiling. It was carried out. Therefore, the robot has to swing around this thick cable as it moves, and the cable is subject to sudden twists and bends in order to control the posture of the welding gun at each welding point. has become a consumable item.
これに対し、前述したトランス内蔵ガンは、溶 −
接トランスの二次コイル側が、加圧機構をもった溶接ヘ
ッドと一体に組込まれているため溶接電流回路の太い水
冷式ケーブルがなくなり、又大きな溶接電流の流れる回
路のインピーダンスが非常に小さくなるため溶接トラン
スの電気容量が低減でき、その形状を極めて小形、軽量
にすることができたわけである。On the other hand, with the transformer built-in gun described above, the secondary coil side of the welding transformer is integrated with the welding head with a pressurizing mechanism, which eliminates the need for a thick water-cooled cable for the welding current circuit, and also requires a large Since the impedance of the circuit through which the welding current flows becomes extremely small, the electric capacity of the welding transformer can be reduced, making it possible to make it extremely compact and lightweight.
しかし、このトランス内蔵ガンを溶接ロボットアームの
先端に取付けて溶接作業を行うことによ１１らだな問題
点が発生した。However, 11 problems arose when this gun with a built-in transformer was attached to the tip of a welding robot arm to perform welding work.
即ち、このシステムは、従来の低電圧大電流回路のケー
ブルの代りに、２００Ｖ又は４００ｖ定格の高い電圧回
路をロボットにより振りまわすことになり、ケーブル自
体は細くなり、その寿命は長くなったものの、往後電路
を形成する２本のケーブル芯線間の短絡や、高電位にあ
るケーブル芯線とアース電位にあるロボット・アームや
ジグ等との間の絶縁破壊の危険性が増大し、その上、こ
れら事故が発生した場合のスパークによる周辺機器の損
傷や電力供給システムに与える影響は見過すことのでき
ない大きな恐威となって来たのである。In other words, in this system, a high voltage circuit with a 200V or 400V rating is used by the robot instead of the conventional low-voltage, high-current circuit cable, and although the cable itself is thinner and its lifespan is longer, This increases the risk of a short circuit between the two cable core wires that form the back electrical path, or of insulation breakdown between the cable core wire at high potential and a robot arm, jig, etc. that is at ground potential. The damage caused by sparks to peripheral equipment and the impact on the power supply system when sparks occur has become a serious threat that cannot be overlooked.
これらの危険性は、他に多くのオリ点をもつ該トランス
内蔵ガンの実用化を甚だしく阻害するものであるが、本
発明けこれら問題点に対し抜本的々解決を与えるもので
ある。Although these risks seriously hinder the practical application of the transformer built-in gun, which has many other points, the present invention provides a fundamental solution to these problems.
図は本発明の一実施例を示す電気回路図であるが、図に
より従来技術と本発明とを比較駁、明すると、次のよう
になる。The figure is an electric circuit diagram showing an embodiment of the present invention. A comparison and explanation of the prior art and the present invention using the figure is as follows.
一般に、トランス内蔵カン（１）は、スポット溶接ロボ
ット＋２１ （図示省略）の可動アームの先端に固定さ
れ、ワークのスポット浴接位置に従って順次筒速移送さ
れ、又、ワーク形状に従ってガン目体の姿勢も急激ｆＸ
、変化を受けることになる。In general, the can (1) with a built-in transformer is fixed to the tip of a movable arm of a spot welding robot +21 (not shown), and is sequentially transferred at a cylinder speed according to the spot bath contact position of the workpiece, and the gun eye position according to the shape of the workpiece. Also rapid fX
, will undergo changes.
従って、溶接トランスの一次側に接続されている可動ケ
ーブル（３１：Ｊ［めて激（７いひねりや曲げ等の動き
を強要され次第に損耗してゆくが、特に、ケーブル外周
の絶縁体がロボット・アームや周辺のジグ装置等とこす
れ合い、繰返されるケーブルの動きのため遂にその絶縁
が機械的に破壊され、ケーブル芯線とアース電位にある
周辺の構造物とが接触するいわゆる地絡というトラブル
が多く発生する。Therefore, the movable cable connected to the primary side of the welding transformer (31:J) is forced to twist, bend, etc. and gradually wears out.・Due to repeated movement of the cable as it rubs against the arm and surrounding jig equipment, its insulation is finally mechanically broken, causing troubles called ground faults where the cable core comes into contact with surrounding structures at ground potential. Occurs often.
従来は、このような地絡事故に対する安全対策として、
電沖側ブレーカ（９）に漏電遮断器を採用しアースへの
リーク電流が検出された場合は、ただちに電源を遮断す
る処置がとられていた。Conventionally, as a safety measure against such ground fault accidents,
An earth leakage breaker was installed on the electric offshore breaker (9), and if a leakage current to the ground was detected, measures were taken to immediately cut off the power.
しかし、現在最も標準的電子スイッテとして実相きれて
いるサイリスターコンタクタ（７）は水冷式であり、そ
の水冷ホースに水垢がたまったシし電路の絶縁抵抗が低
下すると漏電遮断器が誤動作することがあり、冷却水の
水質を改善したシ、場合によってはその水冷部分を充電
部から絶縁した特殊なサイリスタを使用する等面倒な処
＃が必要となった。However, the thyristor contactor (7), which is currently the most standard electronic switch, is water-cooled, and if water scale accumulates on the water-cooled hose and the insulation resistance of the electrical circuit decreases, the earth leakage circuit breaker may malfunction. However, the quality of the cooling water has to be improved, and in some cases, it has become necessary to take complicated steps such as using a special thyristor that insulates the water-cooled part from the live parts.
又、＠電遮断器のわずかな動作時間の間とはいえ、２０
０Ｖ又は４００ｖ定格の高い電源電圧が接地した場合に
は大きな地絡電流か流れ、そのスパークによりロボット
・アームやジグ等に損傷を与える危険性も無視すること
はできない。Also, although it is only for a short period of time when the electric circuit breaker is operating, 20
If a high power supply voltage rated at 0V or 400V is grounded, a large ground fault current will flow, and the risk of damaging the robot arm, jig, etc. due to the spark cannot be ignored.
これに対し、本発明は溶接電源（１０）とトランス ５
−
内蔵ガン（１）との中間にステップダウン用絶縁トラン
ス（４）を設置し、可動ケーブル（３）を含む電路を低
い電圧の電飾をもつ電流検出器（５）を介してアース（
６）に接続することにより前述１〜だ問題点に解決を与
えるものである。In contrast, the present invention includes a welding power source (10) and a transformer.
- A step-down isolation transformer (4) is installed between the built-in gun (1) and the electrical path including the movable cable (3) is grounded (
By connecting to 6), problems 1 to 1 above can be solved.
即ち、この絶縁トランス（４）と電流検出器（５）との
設置により、可動ケーブル（３）の対アース電位を極め
て低く保つことができるため、その絶縁破壊の危険性は
減少でき、又、絶縁トランスの一部コイル側にあるサイ
リスタ・コンタクタ（７）の対アースリーク霜：流はア
ース電流検出器（５）の（芙出電流とは無関係になるた
めサイリスタは通常の市販品をそのまま使用することが
できる。That is, by installing the isolation transformer (4) and the current detector (5), the potential of the movable cable (3) to the ground can be kept extremely low, so the risk of dielectric breakdown can be reduced, and The thyristor/contactor (7) on the coil side of the isolation transformer has no relation to the earth current detector (5). can do.
一方、電流挽出器（５）娃、例えば、直流１２Ｖ又は２
４Ｖ程度の危険の少ない低い電圧の電源を内蔵し、ｌＯ
〜２０私 相間の微少電流の流通を検出して警報を発信
する機能を有するものである。On the other hand, the current collector (5) has a current value of 12V or 2V, for example.
Built-in low voltage power supply with little danger of about 4V, lO
~20 I It has the function of detecting the flow of minute current between phases and issuing an alarm.
今、絶縁トランス（４）の設置によ、リフローティング
電位にある可動ケーブル（３）の電路の一部と、アース
（６）との間に前記した電流検出器（５）を接続するこ
とにより、ケーブル（３）の電位はアースに対して１２
ｖ５／、ケ２４■という非常に低い値に保つことができ
るため前述したようにケーブル外周を保護している絶縁
体の電、圧による破壊の危険性が激減するばかりでなく
、ケーブル交換時等保守のためにケーブル（３）の電路
に人間が触れた場合の安全性を保つこともできる。Now, with the installation of the isolation transformer (4), the above-mentioned current detector (5) is connected between a part of the electric path of the movable cable (3) which is at a refloating potential and the earth (6). , the potential of cable (3) is 12 with respect to earth
Since it is possible to maintain a very low value of v5/, ke24■, it not only drastically reduces the risk of damage to the insulator that protects the outer periphery of the cable due to voltage and pressure, but also when replacing the cable. It is also possible to maintain safety in case a person touches the electric circuit of the cable (3) for maintenance.
この様な状態において、例えば、可とる性ケーブル（３
）の絶縁が機械的に破壊されて、ケーブルの芯線がアー
ス電位にあるロボット・アームやジグ等に接触すると、
電流検出器（５）に内蔵されている低い電圧の電源から
アースを経て地絡電流１ｅが流れ始める。電、流検用益
（５）は絶縁破壊初期に発生するこの微弱な地絡電流１
ｅを検出し、例えばリレー接点信号等のむ報を発信する
ことになる。In such a situation, for example, a flexible cable (3
) is mechanically broken and the core wire of the cable comes into contact with a robot arm, jig, etc. that is at ground potential.
A ground fault current 1e begins to flow from the low voltage power supply built into the current detector (5) via the ground. Current and current test benefit (5) is this weak ground fault current 1 that occurs at the early stage of dielectric breakdown.
e is detected and a message such as a relay contact signal is transmitted.
この訃報は、主として可動ケーブル（３）の交換時期を
報知するものであるが、ただちに電源ブレーカ（９）を
遮断し、溶接ロボット等自動機の運転を停止させる信号
として使用することもできる。This obituary notice is mainly used to notify when it is time to replace the movable cable (3), but it can also be used as a signal to immediately shut off the power breaker (9) and stop the operation of automatic machines such as welding robots.
一方、電流検出器（５）は従来の漏電遮断器と同一の役
割りを持つものであるが、一般の漏電遮断器をを付けた
場合と大きく相異するのはその内部に低い電圧の軍曹を
内蔵している点である。On the other hand, the current detector (5) has the same role as a conventional earth leakage breaker, but the main difference from a regular earth leakage breaker is that there is a low voltage breaker inside it. The point is that it has built-in.
これにより浴接電源（１０）ゲ遮断した安全な状態でも
可動ケーブル（３）の対アース絶縁破壊の検出が可能と
なるため、ロボット等スホット溶接装置をカラ運転略せ
、可動ケーブル（３）が移動状態にあるときに発生しか
ちな、或いは動いている一瞬の期間のみ発生する地籟現
液ケ再現し、確認すること全可能ならしめている。This makes it possible to detect dielectric breakdown of the movable cable (3) to earth even in a safe state where the bathing power supply (10) is cut off, so the hot welding equipment such as robots can be omitted and the movable cable (3) can be moved. This makes it possible to reproduce and confirm natural phenomena that tend to occur when the robot is in a certain state, or that occur only for a moment when the robot is in motion.
なお、図の（８）ハタイマを示し、スポット浴接のシー
ケンスやサイリスタ・コンタクタ（７）への浴接通電悟
号紮光伯する装置である。The timer (8) in the figure is a device that performs the spot bath contact sequence and the bath contact energization to the thyristor contactor (7).
図は本発明の実施例を示す電気凹略図である、■ トラ
ンス内蔵カン
（２）スホット溶接ロボット
■ 可動ケーブル
■ ステンフダウン用絶縁トランス
■ 電流検出器
（６）アース
Ｑ）サイリスタ・コンタクタ
■ タイマ
■ ブレーカ
（，０２００Ｖ 又ハａｏｏ’Ｖ 定格溶接電源伸ＳＷ
纜The figure is a schematic electrical diagram showing an embodiment of the present invention. ■ Can with built-in transformer (2) Hot welding robot ■ Movable cable ■ Insulating transformer for strength down ■ Current detector (6) Earth Q) Thyristor/contactor ■ Timer ■ Breaker (,0200V also haaoo'V rated welding power source extension SW
pure
Claims (1)
いわ＠るトランス内蔵ガンを使用するスボッ）Ｉ＝Ｉ’
ｌロホ′ットなどの目動スポット溶接装置において、 溶接通電を制御する電子スイッチを介在した浴接電Ｗと
前記浴接トランスとの間にステソノダウン用ｉｌｅ縁ト
ランスを設置し、その絶好トランスの二次コイル倶１と
、該浴接トランスの一次コイル１ｔｉｕとを接続する可
とう性ケーブルを含む電路とアースとの間に、低い電圧
の亀Ｗを囮ルした電流り用益を接続し、前記可どう性ケ
ーブルを含む電路の対アース絶縁破壊による地絡電流が
検出された場合に警報を発明することを特許とするトラ
ンス内にガン用電路の地絡検出装置。 １−[Scope of Claims] A welding transformer and a hot #connection head that are integrated into one unit using a gun with a built-in transformer) I=I'
In a variable spot welding device such as a lo-hot, an ile edge transformer for stesono down is installed between the bath welding transformer and the bath welding transformer with an electronic switch that controls the welding energization. A current using a low voltage tortoise W is connected between the electrical circuit including a flexible cable connecting the secondary coil 1 and the primary coil 1tiu of the bath-connected transformer and the ground, A ground fault detection device for a gun electric line in a transformer, which is patented to issue an alarm when a ground fault current is detected due to insulation breakdown to earth in an electric line containing a flexible cable. 1-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP315483A JPS59127977A (en) | 1983-01-12 | 1983-01-12 | Ground fault detecting device of circuit for gun having built-in transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP315483A JPS59127977A (en) | 1983-01-12 | 1983-01-12 | Ground fault detecting device of circuit for gun having built-in transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59127977A true JPS59127977A (en) | 1984-07-23 |
| JPS6159834B2 JPS6159834B2 (en) | 1986-12-18 |
Family
ID=11549432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP315483A Granted JPS59127977A (en) | 1983-01-12 | 1983-01-12 | Ground fault detecting device of circuit for gun having built-in transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59127977A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61162374U (en) * | 1985-03-29 | 1986-10-08 | ||
| JPS6277680U (en) * | 1985-10-30 | 1987-05-18 | ||
| JPS6286980U (en) * | 1985-11-22 | 1987-06-03 | ||
| JPH0426682U (en) * | 1990-06-28 | 1992-03-03 |
-
1983
- 1983-01-12 JP JP315483A patent/JPS59127977A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61162374U (en) * | 1985-03-29 | 1986-10-08 | ||
| JPS6277680U (en) * | 1985-10-30 | 1987-05-18 | ||
| JPH0231267Y2 (en) * | 1985-10-30 | 1990-08-23 | ||
| JPS6286980U (en) * | 1985-11-22 | 1987-06-03 | ||
| JPH0230156Y2 (en) * | 1985-11-22 | 1990-08-14 | ||
| JPH0426682U (en) * | 1990-06-28 | 1992-03-03 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6159834B2 (en) | 1986-12-18 |
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