CN1461945A - Laser leakage detecting and welding method and device - Google Patents
Laser leakage detecting and welding method and device Download PDFInfo
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- CN1461945A CN1461945A CN 02115295 CN02115295A CN1461945A CN 1461945 A CN1461945 A CN 1461945A CN 02115295 CN02115295 CN 02115295 CN 02115295 A CN02115295 A CN 02115295A CN 1461945 A CN1461945 A CN 1461945A
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Abstract
A method for welding the leakage point detected by laser includes such steps as detecting the leakage point on the wall of workpiece by laser imaging method, and controlling the laser welding gun to weld on the leakage point. Its apparatus is composed of laser leakage detector, detecting chamber, laser welder, and CPU for controlling said laser leakage detector and laser welder.
Description
[technical field]
The present invention relates to a kind of leak detection and method and device that welding combines, specially refer to the laser analysis molecular weight and determine leak source and control laser welding method and device.
[background technology]
Some industrial circle is very high to the sealing requirements of device, uses fluorine Lyons gas as former refrigerating system more, and state quality standard requires a year slip to be not more than 2 grams.Producer uses various leakage detection apparatus to carry out quality control.
Existing leak hunting method is broadly divided into four classes: pressure detection method, vacuum detecting method, gas detection method and ultrasonic Detection Method, wherein the sensitivity of gas detection method can reach year slip less than 1 gram.In the gas detection method, commonly used have halogen detection method, temperature conductivity detection method and a helium detector etc.Wherein helium leak detector sensitivity is higher, uses also extensive.Helium leak detector needs earlier the leak detection chamber to be vacuumized usually, then the tested workpiece that is filled with high-pressure helium is put into the leak detection chamber, determines by detecting the outer concentrations of helium of workpiece whether workpiece has leak source.The shortcoming of this method is the cost height, needs huge vacuum pump, and the noise that operates is big; The recovery problem that has helium, another shortcoming of this method is the quality requirements that can only determine whether to meet sealing, and is difficult to determine the leak source place.
For overcoming above-mentioned difficulties, the someone proposes with laser imaging leak detection system location leak source.Patent 00120955.8 discloses a kind of laser imaging detection system and method, by laser is beaten on measured object, because leak source gas to the thermal absorption of laser, can accurately be observed the place of leak source by imaging system.But because utilize the cooperation of scanner head and monitor to determine leak source, take scanner head with hand sometimes, mainly depend on manual detection, do not form industrial automation, often become a bottleneck of subsequent handling, be difficult to satisfy the requirement that modern industry is produced.
[summary of the invention]
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, in order to satisfy the requirement that modern industry is produced, guarantees product quality, prevent that substandard products from entering next production link, save cost, raise the efficiency, thereby a kind of method and device that adopts laser leakage detecting and welding to combine is provided.
The object of the present invention is achieved like this: make up a kind of laser leakage detecting welding method, may further comprise the steps: (1) detects step: determine leak source on the tested workpiece wall with the method for laser imaging; (2) welding step: leak source is welded according to leak source position control laser welding gun.
Corresponding described method makes up a kind of laser detection welder, comprises sensing chamber, is used to place tested workpiece; The laser leakage detecting device is used for determining tested workpiece leak source position; It is characterized in that, also comprise laser soldering device, be used for described leak source is replenished welding; Central processing unit is used to control the laser leakage detecting device and hunts leak, and according to the leak source position that the laser leakage detecting device provides, laser soldering device is sent the serial control signal of welding.
The present invention is because adopt the robotization laser detection and laser welding technology, with laser detection molten with the laser bonding combination be one, can handle leak source immediately, thereby, simplified the detection operation, improved detection efficiency, reduce the detection cost, guaranteed the detection quality.Can directly apply on the production line easily.
[description of drawings]
Fig. 1 is a principle of the invention synoptic diagram;
Fig. 2 is a laser leakage detecting workflow diagram of the present invention;
Fig. 3 is a laser bonding workflow diagram of the present invention;
Fig. 4 is a laser soldering device synoptic diagram of the present invention;
Fig. 5 is the synoptic diagram of the three-dimensional control head of the present invention;
Fig. 6 is detected workholder figure in the sensing chamber of the present invention;
The structural drawing of Fig. 7 sensing chamber of the present invention inlet/outlet;
[embodiment]
As shown in Figure 1, tested workpiece 1 is set up in the sensing chamber 2 by autotransmitter.Air pump 3 injects the high pressure tracer gas in tested workpiece chamber 12, as through condenser and the dried air of air strainer, make it to reach the rated pressure value, when workpiece 1 body internal gas pressure reaches the force value of setting, as 8 atmospheric pressure, pressure transducer sends and closes gas check valve 32 signals.Air valve 32 is closed, and air pump 3 stops air feed, gives off laser beam as the computing machine 4 instruction laser scanning devices 5 of central processing unit.Shine on the check point of tested workpiece 1 or the top of check point, follow the tracks of certain gas molecule such as nitrogen, the leak molecule number n of tracer gas of acquisition units time such as per second sends computing machine 4 to, passes through formula
m＝n*N*60*60*24*365*k
Wherein n is the per second molecule number that leaks, and N is a molecular weight, and k is the quality constant of ordinary hydrogen atom.
Whether calculate the molecule gross mass that nitrogen leaked in a year, convert out the annual gross mass of leaking of air according to the shared number percent of nitrogen in the air again, thereby judge whether to meet state quality standard, be leak source to determine this check point.
For guaranteeing that tested workpiece leaks the accurate data of situation, and reach computing machine 4 rapidly.Native system is selected laser raster scan for use.Close the molecular weight that leaks that video camera (or microscope) is gathered the high pressure tracer gas of tested workpiece welding position by high power holographic optical lotus root, determine the weldquality situation with this.After the high pressure tracer gas of gathering that leaks is analyzed by computer processing system, make whether qualified judgement.If conformance with standard is then carried out the detection of next solder joint along continuing; If exceed standard, the pressure release instruction is then sent at the Computer Processing center.At this moment, air valve 32 is opened, and tested workpiece inner high voltage tracer gas is let out be normal pressure.At this moment, laser welding gun 8 obtains work order, and leakage point 13 is carried out repair welding.Solder joint is by the time-delay cooling.Weldering is finished, and computing machine 4 sends the inflation instruction once more, and air pump 3 injects the high pressure tracer gas in the tested workpiece chamber 12.Sequential loop work so successively.
Leak detection and repair welding are finished, and 5 times initial points of laser scanning device trigger travel switch, send the signal of opening door, and tested workpiece 1 delivers from godown through going out door along pipeline, and another tested workpiece puts in storage from the warehouse entry door in order, continue the leak detection welding sequence.
Also available other aerating devices of employed air pump replace.
As shown in Figure 4, laser welding gun 8 carries out repair welding to leak source 13 under the control of computing machine 4.Laser welding gun 8 can be a beam of laser, also can be multiple laser.This laser welding gun 8 also can use same lasing light emitter with laser scanning device 5.
Be illustrated in figure 5 as three-dimensional control device, 61 is control head, and 62,63,64 are respectively guide rail vertical each other in the three dimensions.Digital control by computing machine 4 implementations, control head 61 can move arbitrarily in three dimensions.Laser scanning device or laser welding gun can be installed on the control head,, move arbitrarily or rotate at three dimensions according to the control signal of computing machine 4.Thereby realize scanning and welding from each different height and angle.As shown in the figure, place on the worktable, be in tested state as the condenser of tested workpiece 1.
Fig. 6 is the cut-open view of laser leakage detecting welder.A pair of anchor clamps 73 are housed on the platform 72, are used for fixing tested workpiece.Platform can move along guide rail 74.By the control of computing machine 4, the warehouse entry door is opened, and platform enters sensing chamber along guide rail; After detection finishes, go out door and open, platform shifts out sensing chamber along guide rail.
Figure 7 shows that the cut-away view of outer cover of laser leakage detecting welder.Can see that two sides that this device is relative are equipped with the warehouse entry door respectively and are gone out door, opened and closed automatically by the control of computing machine 4.Transparent windows is equipped with in the another side, can see the state of workpiece 1 in sensing chamber.
The implication of each Reference numeral is: the tested workpiece of 1-; The tested workpiece of 12-chamber; 2-sensing chamber; The 3-air pump; 32, the 35-air valve; 33-source of the gas or air pump; The 34-condenser; 4-computing machine (central processing unit); The 5-laser scanning device; The 52-generating device of laser; The three-dimensional control device of 6-; The three-dimensional control head of 61-; 62-horizontal guide rail 1; 63-horizontal guide rail 2; The 64-vertical guide rail; The 72-workbench; The 73-workholder; The 74-guide rail; 8-laser welding gun; The 82-generating device of laser; 91,92-workpiece turnover door; The 93-view window.
This laser leakage detecting welder compact conformation, volume little, in light weight (taking up an area of 25m, about 400kg).With the box helium leak test of vacuum system contrast, native system has saved specific vacuum working environment, needs inject in workpiece high-pressure helium, but inject after filtration, dry air.Testing environment there is not strict demand.Both can accurately measure leak source, and can be directly at the leak source reading.Adopt laser welding technology again, organically combine laser detection and laser bonding molten and be one, can handle leak source immediately, guaranteed the detection quality.
Laser bonding is precise and high efficiency not only, and hot melt district scope is little, the welding quality height.With laser bonding air-conditioning condenser leak source is example.The fusing point of copper pipe is 800 degrees centigrade, and the fusing point of wlding lead is 600 degrees centigrade.The welding temperature that we set is 650 degrees centigrade.Like this, solder fusing can not damage copper pipe, can not influence outward appearance yet.
This device can be according to user's needs, but both unit uses, but also multi-machine parallel connection docks with automatic production line, works continuously.Can be widely used in refrigeration industry, auto industry, aviation, navigation, nuclear industry, electronics, electric, fire-fighting, chemical industry, medicine food industry.
Claims (10)
1, a kind of laser leakage detecting welding method may further comprise the steps:
Detect step: determine leak source on the tested workpiece wall with the method for laser imaging;
Welding step: leak source is welded according to leak source position control laser welding gun.
2, laser leakage detecting welding method according to claim 1 is characterized in that, described detection step comprises:
Step 1: control laser beam irradiation on the check point or be radiated at check point above;
Step 2: the acquisition testing point tracer gas molecular weight that leaks, after analyzing by computer processing system, make whether qualified judgement;
Step 3: it is qualified to judge, then enters next check point and detects; If judgement is defective, then enter welding step.
3, laser leakage detecting welding method according to claim 2 is characterized in that, described detection step also comprises; Before step 1, in tested workpiece, charge into the high pressure tracer gas.
4, require described laser leakage detecting welding method according to aforesaid right, it is characterized in that, described welding step comprises:
Step 1: emit the high pressure tracer gas in the tested workpiece;
Step 2: control laser welding gun welds leak source;
Step 3: allow pad cooling a period of time;
Step 4: this solder joint is reentered the detection step.
5, a kind of laser detection welder comprises
Sensing chamber is used to place tested workpiece;
The laser leakage detecting device is used for determining tested workpiece leak source position;
It is characterized in that, also comprise:
Laser soldering device is used for described leak source is replenished welding;
Central processing unit is used to control the laser leakage detecting device and hunts leak, and according to the leak source position that the laser leakage detecting device provides, laser soldering device is sent the serial control signal of welding.
Whether 6, laser detection welder according to claim 5 is characterized in that, described central processing unit is used to calculate the molecule total amount of the described tracer gas that leaks, and judges whether conformance with standard, be leak source to determine this check point.
7, laser detection welder according to claim 5 is characterized in that, described laser leakage detecting device comprises aerating device, is used for described tested workpiece is charged into the high pressure tracer gas;
Laser scanning device is used to give off laser beam, and shines on the check point of tested workpiece or the top of check point, gathers the molecular weight of tracer gas that leaks, and counts.
8, laser leakage detecting welder according to claim 5 is characterized in that, described laser soldering device comprises
Exhaust apparatus is used to discharge the high pressure tracer gas in the tested workpiece;
The laser welding gun is used for the leak source of tested workpiece is replenished welding.
9, according to claim 7 or 8 described laser leakage detecting welders, it is characterized in that, described laser scanning device and described laser welding gun all are fixed on the three-dimensional control head, this three-dimensional control head can be according to the control signal of central processing unit, and three-dimensional space moves arbitrarily or rotates in sensing chamber.
According to laser leakage detecting welder according to claim 5, it is characterized in that 10, described sensing chamber is equipped with straight-through warehouse entry door and goes out door in the side, tested workpiece is admitted to sensing chamber from the warehouse entry door, is sent sensing chamber from going out door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02115295 CN1461945A (en) | 2002-05-29 | 2002-05-29 | Laser leakage detecting and welding method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02115295 CN1461945A (en) | 2002-05-29 | 2002-05-29 | Laser leakage detecting and welding method and device |
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| CN1461945A true CN1461945A (en) | 2003-12-17 |
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| CN 02115295 Pending CN1461945A (en) | 2002-05-29 | 2002-05-29 | Laser leakage detecting and welding method and device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797250B (en) * | 2004-12-30 | 2010-12-08 | C.R.F.阿西安尼顾问公司 | Module with sensor means for monitoring industrial processes |
| CN102213634A (en) * | 2011-03-22 | 2011-10-12 | 天津双昊车用空调有限公司 | Visual leakage inspection device |
| CN104833464A (en) * | 2015-05-26 | 2015-08-12 | 合肥佳智自动化科技有限公司 | Multifunctional airtight detector and detection method thereof |
| CN106840556A (en) * | 2016-11-28 | 2017-06-13 | 中建三局安装工程有限公司 | A kind of Full-automatic leaked optical detector |
| CN108581202A (en) * | 2018-05-03 | 2018-09-28 | 温州职业技术学院 | A kind of test integrated method of the laser welding of condenser pipe |
| CN111230245A (en) * | 2020-03-20 | 2020-06-05 | 南京英格伯格智能装备有限公司 | Intelligent welding and leakage detecting device for refrigerator press cabin pipeline |
| CN111272352A (en) * | 2020-03-05 | 2020-06-12 | 涡阳县安元汽车配件有限公司 | Axle housing welding seam leakage detection device |
-
2002
- 2002-05-29 CN CN 02115295 patent/CN1461945A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797250B (en) * | 2004-12-30 | 2010-12-08 | C.R.F.阿西安尼顾问公司 | Module with sensor means for monitoring industrial processes |
| CN102213634A (en) * | 2011-03-22 | 2011-10-12 | 天津双昊车用空调有限公司 | Visual leakage inspection device |
| CN104833464A (en) * | 2015-05-26 | 2015-08-12 | 合肥佳智自动化科技有限公司 | Multifunctional airtight detector and detection method thereof |
| CN106840556A (en) * | 2016-11-28 | 2017-06-13 | 中建三局安装工程有限公司 | A kind of Full-automatic leaked optical detector |
| CN108581202A (en) * | 2018-05-03 | 2018-09-28 | 温州职业技术学院 | A kind of test integrated method of the laser welding of condenser pipe |
| CN111272352A (en) * | 2020-03-05 | 2020-06-12 | 涡阳县安元汽车配件有限公司 | Axle housing welding seam leakage detection device |
| CN111230245A (en) * | 2020-03-20 | 2020-06-05 | 南京英格伯格智能装备有限公司 | Intelligent welding and leakage detecting device for refrigerator press cabin pipeline |
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