CN110465756B - Laser protection lens temperature detection device and detection method thereof - Google Patents
Laser protection lens temperature detection device and detection method thereof Download PDFInfo
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- CN110465756B CN110465756B CN201910579587.9A CN201910579587A CN110465756B CN 110465756 B CN110465756 B CN 110465756B CN 201910579587 A CN201910579587 A CN 201910579587A CN 110465756 B CN110465756 B CN 110465756B
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 105
- 230000001681 protective effect Effects 0.000 claims abstract description 31
- 230000000630 rising effect Effects 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 39
- 230000008569 process Effects 0.000 claims description 38
- 238000003466 welding Methods 0.000 claims description 38
- 239000011521 glass Substances 0.000 claims description 33
- 230000008859 change Effects 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 5
- 239000013013 elastic material Substances 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000011109 contamination Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Classifications
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a laser protection lens temperature detection device, which comprises a lens holding mechanism, a temperature sensor holding mechanism and a temperature sensor assembly; the lens is clamped on the lens holding mechanism, and the lens holding mechanism is inserted into the temperature sensor holding mechanism; the temperature sensor assembly comprises a thermal resistor, the temperature sensor assembly is arranged in the temperature sensor holding mechanism, and the thermal resistor is tightly contacted with the lens under the action of the temperature sensor assembly; the lens retaining mechanism is provided with a through hole, the center of the lens is positioned on the through hole, the temperature sensor retaining mechanism is provided with a light hole opposite to the through hole, and laser coming out of the air knife is emitted after passing through the through hole and the light hole. The device can protect the lens, can directly detect the real-time temperature of the protective lens, and judges the real-time state of the protective lens by utilizing the temperature value and the temperature rising speed; and statistically analyzing the temperature values and the critical values of the temperature rising speed of the protective lenses in various running states through a large-batch temperature measurement test.
Description
Technical Field
The invention relates to the technical field of lens temperature detection, in particular to a laser protection lens temperature detection device and a detection method thereof.
Background
The lithium ion power battery shell is widely applied to welding by adopting laser, intelligent manufacturing is a target pursued for power battery production, and battery welding production equipment is required to have continuous operation and running state digital monitoring capability. The laser welding process is easy to produce welding spatter and smoke dust, pollute or burst the protective lens, so that the laser output power is reduced, the beam quality is reduced or the laser core component is further polluted, the welding quality is unstable, and defective products are produced. At present, on a battery welding production line, defective products are found manually, and then the reasons are traced back, so that a large number of defective products or quality critical products are generated, and the problems of production cost improvement, efficiency reduction, hidden danger of product quality and the like are caused.
The use safety is a ticket overrule index of the power lithium ion battery, the power battery shell is generally made of aluminum alloy, welding spatter and smoke dust are relatively large, so that the pollution or explosion of a protective lens is caused, the stability of welding quality is influenced, the subsequent process and use are greatly hidden, serious consequences such as battery short circuit and deflagration are even caused, and the safety operation and the life of passengers are threatened.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a laser protection lens temperature detection device and a detection method thereof.
The invention is realized by the following technical scheme: a laser protection lens temperature detection device comprises a lens holding mechanism, a temperature sensor holding mechanism and a temperature sensor assembly; the lens is clamped on the lens holding mechanism, and the lens holding mechanism is detachably inserted into the temperature sensor holding mechanism and can slide along the temperature sensor holding mechanism; the temperature sensor assembly comprises a thermal resistor, the temperature sensor assembly is installed in the temperature sensor holding mechanism, and the thermal resistor is tightly contacted with the lens under the action of the temperature sensor assembly; the lens retaining mechanism is provided with a through hole, the center of the lens is positioned on the through hole, the temperature sensor retaining mechanism is provided with a light hole opposite to the through hole, and laser coming out of the air knife is emitted after passing through the through hole and the light hole.
The lens retaining mechanism is detachably arranged, so that the lens can be replaced conveniently, and the repeated test can improve the detection accuracy; the through holes and the light holes are arranged, and laser from the air knife is penetrated; the device is applied to the lithium battery production process, monitors the technical parameters of the state of the protection lens in real time in the laser welding process, and ensures the consistency of welding quality.
The lens holding mechanism comprises a lens holder pressing plate, a lens holder and an elastic pressing sheet made of elastic materials; the glasses frame is of an L-shaped structure, the through holes comprise an upper through hole and a lower through hole, and the lower through hole is formed in the glasses frame pressing plate; the upper through hole is formed in the spectacle frame pressing plate, and a plurality of elastic pressing sheets are arranged at the lower end of the spectacle frame pressing plate; the glasses frame is characterized in that the glasses frame is provided with a plurality of elastic pressing sheets, the glasses frame pressing sheets are arranged on the glasses frame, the glasses frame pressing sheets are buckled on the glasses frame, the elastic pressing sheets are in contact with and press the glasses frame, and the glasses frame pressing sheets and the glasses frame are buckled and locked up and down to form a smooth block structure. The glasses frame pressing plate and the elastic pressing plate form a glasses frame elastic pressing plate body, the glasses frame elastic pressing plate body enables the glasses to be uniformly stressed, the glasses are fixed in the glasses frame through the elasticity of the elastic pressing plate, and the elastic pressing plate made of elastic materials can ensure expansion space when the protection glasses are heated and expanded, so that the risk of breakage of the protection glasses is reduced.
The elastic pressing plates are provided with four, the lower ends of the glasses frame pressing plates are provided with a pair of mounting grooves, the two mounting grooves are distributed in a crisscross manner, and the upper through holes penetrate through the mounting grooves; one end of the elastic pressing piece is locked in the mounting groove, and the other end of the elastic pressing piece is higher than the bottom surface of the pressing plate of the glasses frame; when the glasses frame pressing plate is locked on the glasses frame, the elastic pressing plate is deformed and pressed on the lenses. The elastic pressing sheet is provided with four, and adopts a crisscross pressing mode, so that the lens can be tightly pressed, and the pressing force is uniform.
The temperature sensor retaining mechanism comprises a laser head connecting piece provided with a first light hole, a lens holder retainer, a temperature sensor guide frame provided with a second light hole and a temperature sensor supporting plate provided with a third light hole; the lens holder is provided with a channel which is matched with the lens holding mechanism in shape and is used for the lens holding mechanism to freely enter and exit; the first light holes, the second light holes and the third light holes are opposite in position; the laser head connecting piece, the mirror bracket retainer, the temperature sensor guide frame and the temperature sensor support plate are sequentially distributed from top to bottom; the temperature sensor guide frame is provided with a guide groove for installing the temperature sensor component, and the temperature sensor guide frame and the temperature sensor support plate form a guide mechanism of the temperature sensor component up and down. The temperature sensor holding mechanism can hold the temperature sensor component in a static state during temperature measurement, and can also hold the contact lens of which the temperature sensor is continuously stable, so as to stabilize the temperature measurement process; the temperature sensor guide frame and the temperature sensor support plate form a temperature sensor guide mechanism, so that the temperature sensor assembly is ensured to act on the same area of the lens before and after the lens is replaced.
The temperature sensor assembly further comprises a spring and a resistance welding plate; the temperature sensor supporting plate is provided with a mounting hole; the resistance welding plate is welded at the upper end of the thermal resistor, and the lower end of the thermal resistor is inserted into the mounting hole of the temperature sensor supporting plate; the spring is sleeved at the outer end of the thermal resistor, the lower end of the spring is propped against the temperature sensor supporting plate, the upper end of the spring is propped against the resistance welding plate, the resistance welding plate and the thermal resistor are positioned in the guide groove, and the movable space of the resistance welding plate is positioned in the guide groove between the lens holder retainer and the temperature sensor supporting plate; the thermal resistor is tightly contacted with the lens under the action of the spring.
The detection method based on the laser protection lens temperature detection device comprises the following steps:
Step one: the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens holder is separated from the lens holder pressing plate, lenses are placed on the lens holder, the lens holder pressing plate is buckled on the lenses, the elastic pressing plate is stirred to enable the lenses to be buckled and compressed, and the lens holder pressing plate is buckled and locked with the lens holder;
step two: pushing the lens holding mechanism into a channel of the temperature sensor holding mechanism, and tightly contacting the thermal resistor of the temperature sensor assembly with the lens under the action of a spring;
step three: starting laser to weld, and sequentially passing the laser from the air knife through the first light hole, the upper through hole, the lens, the lower through hole and the second light hole and then emitting from the third light hole; in the use process, the operation parameters of the device are as follows:
1. When the detected temperature is a constant value of a certain temperature within 20-30 ℃ and the temperature rising speed of the lens in the temperature rising process is V less than or equal to 0.01 ℃/S, the lens is protected from being clean and pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
2. When the detected temperature is a constant value of a certain temperature within 20-30 ℃, and the temperature rising speed of the lens in the heating process is 0.01 ℃/S less than or equal to V less than or equal to 0.02 ℃/S, the lens is protected from small particle splashing pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
3. When the detected temperature is 30-50 ℃ and a certain temperature value is constant, and the temperature rising speed in the process of heating the lens is 0.02 ℃/S less than or equal to V less than or equal to 0.05 ℃/S, the lens is protected from smoke dust pollution, cleaning is needed after the lens is stopped, and a temperature curve graph of the current time and the temperature change process is recorded;
4. When the detected temperature is 40-70 ℃ and a certain temperature value is constant, and the temperature rising speed in the process of heating the lens is 0.05 ℃/S less than or equal to V less than 0.5 ℃/S, the protective lens is polluted by large particle splashing, the protective lens is required to be cleaned immediately, and a temperature curve graph of the current time and the temperature change process is recorded;
5. When the detected temperature rising speed of the lens in the heating process is greater than 0.5 ℃/S, the lens is cracked and damaged, the lens needs to be immediately stopped for replacement, and a temperature curve chart of the current time and the temperature change process is recorded;
Step four: when the machine is stopped for cleaning, the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens is taken out for cleaning, after the cleaning is finished, the lens is put back into the lens holding mechanism, and the lens holding mechanism is pushed into a channel of the temperature sensor holding mechanism for repeating the operation of the third step;
Step five: when the machine is stopped to replace the lens, the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens is taken out, a new lens is replaced, the lens is installed back to the lens holding mechanism, and the lens holding mechanism is pushed into a channel of the temperature sensor holding mechanism to repeat the operation of the third step.
Compared with the prior art, the invention has the advantages that: the device monitors the state of the protective lens in real time in the laser welding process and controls technical parameters by software, thereby ensuring the consistency of welding quality; the thermal resistor is adopted to directly detect the laser welding head protection lens, the thermal resistor is used for jacking and tightening the protection lens and directly contacting the protection lens, so that the effect of compacting and fixing the protection lens is achieved, the real-time temperature of the protection lens can be directly detected, and the real-time state of the protection lens is judged by utilizing the temperature value and the temperature rising speed; and statistically analyzing the temperature values and the critical values of the temperature rising speed of the protective lenses in various running states through a large-batch temperature measurement test.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a lens retaining mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic view of a frame and lens assembly according to an embodiment of the present invention;
FIG. 4 is a schematic view of a frame platen according to an embodiment of the present invention;
FIG. 5 is a partial cross-sectional view of a lens retaining mechanism according to an embodiment of the present invention;
FIG. 6 is an exploded view of a temperature sensor retention mechanism according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a temperature sensor assembly according to an embodiment of the present invention;
FIG. 8 is a longitudinal cross-sectional view of an embodiment of the present invention;
FIG. 9 is a graph showing temperature profiles for a clean, non-contaminating lens in accordance with an embodiment of the present invention;
FIG. 10 is a graph of temperature profile for a lens of an embodiment of the present invention in the presence of small particle splatter contamination;
FIG. 11 is a graph of temperature profile for a lens of an embodiment of the present invention with soot contamination;
FIG. 12 is a graph of temperature profile for a lens of an embodiment of the present invention in the presence of large particle splash contamination;
FIG. 13 is a graph showing temperature profiles of an example lens of the present invention with crack failure.
The meaning of the reference numerals in the figures: 1. a lens holding mechanism; 101. a frame; 102. a frame platen; 103. elastic tabletting; 104. a lens; 2. a temperature sensor holding mechanism; 201. laser head connecting piece; 202. a frame holder; 203. a temperature sensor guide frame; 204. a temperature sensor support plate; 3. a temperature sensor assembly; 301. thermal resistance; 302. resistance welding plates; 303. and (3) a spring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Examples
Referring to fig. 1 to 13, a laser protection lens temperature detection device comprises a lens holding mechanism 1, a temperature sensor holding mechanism 2 and a temperature sensor assembly 3; the lens 104 is clamped on the lens holding mechanism 1, and the lens holding mechanism 1 is detachably inserted into the temperature sensor holding mechanism 2 and can slide along the temperature sensor holding mechanism; the temperature sensor assembly 3 comprises a thermal resistor 301, the temperature sensor assembly 3 is installed in the temperature sensor holding mechanism 2, and the thermal resistor 301 is closely contacted with the lens 104 under the action of the temperature sensor assembly 3; the lens holding mechanism 1 is provided with a through hole, the center of the lens 104 is positioned on the through hole, the temperature sensor holding mechanism 2 is provided with a light hole opposite to the through hole, and laser from the air knife is emitted after passing through the through hole and the light hole.
The lens holding mechanism 1 is detachably arranged, so that the lens 104 can be replaced conveniently, and the repeated test can improve the detection accuracy; the through holes and the light holes are arranged, and laser from the air knife is penetrated; the device is applied to the lithium battery production process, monitors the technical parameters of the state of the protective lens 104 in real time in the laser welding process, and ensures the consistency of welding quality.
The lens holding mechanism 1 includes a frame pressing plate 102, a frame 101, and an elastic pressing piece 103 made of an elastic material; the glasses frame 101 is of an L-shaped structure, the through holes comprise an upper through hole and a lower through hole, and the lower through hole is formed in the glasses frame pressing plate 102; the upper through hole is formed in the glasses frame pressing plate 102, and a plurality of elastic pressing plates 103 are arranged at the lower end of the glasses frame pressing plate 102; the lens 104 is put on the lens frame 101, the lens frame pressing plate 102 is buckled on the lens 104, the plurality of elastic pressing plates 103 contact and press the lens 104, and the lens frame pressing plate 102 and the lens frame 101 are buckled and locked up and down to form a smooth block structure. The frame pressing plate 102 and the elastic pressing plate 103 form an elastic pressing plate 103 body of the frame 101, the lens 104 is placed in the frame 101, the elastic pressing plate 103 body of the frame 101 enables the lens 104 to be uniformly stressed, the lens 104 is fixed in the frame 101 through the elasticity of the elastic pressing plate 103, and the elastic pressing plate 103 made of elastic materials can ensure expansion space when the protective lens 104 is expanded due to heating, so that the risk of breakage of the protective lens 104 is reduced.
Four elastic pressing plates 103 are arranged, a pair of mounting grooves are formed in the lower end of the glasses frame pressing plate 102, the two mounting grooves are distributed in a crisscross manner, and an upper through hole penetrates through the mounting grooves; one end of the elastic pressing piece 103 is locked in the mounting groove, and the other end of the elastic pressing piece is higher than the bottom surface of the glasses frame pressing plate 102; when the frame pressing plate 102 is locked on the frame 101, the elastic pressing plate 103 is deformed and pressed on the lens 104. The elastic pressing sheet 103 is provided with four, and adopts a crisscross pressing mode, so that the lens 104 can be tightly pressed, and the pressing force is uniform.
The temperature sensor holding mechanism 2 comprises a laser head connecting sheet 201 provided with a first light hole, a lens holder holding frame 202, a temperature sensor guide frame 203 provided with a second light hole and a temperature sensor supporting plate 204 provided with a third light hole; the lens holder retainer 202 is provided with a channel which is matched with the shape of the lens retaining mechanism 1 and is used for freely entering and exiting; the first light holes, the second light holes and the third light holes are opposite in position; the laser head connecting piece 201, the lens holder retainer 202, the temperature sensor guide frame 203 and the temperature sensor support plate 204 are distributed in sequence from top to bottom; the temperature sensor guide frame 203 is provided with a guide groove for installing the temperature sensor assembly 3, and the temperature sensor guide frame 203 and the temperature sensor support plate 204 form a guide mechanism of the temperature sensor assembly 3 up and down. The temperature sensor holding mechanism 2 can hold the temperature sensor component 3 in a static state during temperature measurement, and can also hold the contact lens 104 of which the temperature sensor is continuously stable, so as to stabilize the temperature measurement process; the temperature sensor guide frame 203 and the temperature sensor support plate 204 form a temperature sensor guide mechanism, so that the temperature sensor assembly 3 acts on the same area of the lens 104 before and after the replacement of the lens 104.
The temperature sensor assembly 3 further includes a spring 303 and a resistance welding plate 302; the temperature sensor support plate 204 is provided with a mounting hole; the resistance welding plate 302 is welded at the upper end of the thermal resistor 301, and the lower end of the thermal resistor 301 is inserted into the mounting hole of the temperature sensor support plate 204; the spring 303 is sleeved at the outer end of the thermal resistor 301, the lower end of the spring is propped against the temperature sensor support plate 204, the upper end of the spring is propped against the resistance welding plate 302, the resistance welding plate 302 and the thermal resistor 301 are positioned in the guide groove, and the movable space of the resistance welding plate 302 is positioned in the guide groove between the lens holder retainer 202 and the temperature sensor support plate 204; the thermal resistor 301 is in close contact with the lens 104 under the action of the spring 303.
The device of the embodiment is connected with an upper computer in welding production equipment, after the temperature sensor detects the real-time temperature value, the real-time temperature value is fed back to the upper computer, the upper computer calculates the temperature change speed, and if the temperature change speed and the temperature value reach a certain condition, the upper computer gives a corresponding alarm.
The detection method based on the laser protection lens temperature detection device comprises the following steps:
step one: the lens holding mechanism 1 is pulled out from the temperature sensor holding mechanism 2, the lens holder 101 is separated from the lens holder pressing plate 102, the lens 104 is placed on the lens holder 101, the lens holder pressing plate 102 is buckled on the lens 104, the elastic pressing plate 103 is stirred to enable the lens 104 to be buckled and pressed, and the lens holder pressing plate 102 is buckled and locked with the lens holder 101;
Step two: pushing the lens holding mechanism 1 into the channel of the temperature sensor holding mechanism 2, and tightly contacting the thermal resistor 301 of the temperature sensor assembly 3 with the lens 104 under the action of the spring 303;
step three: starting laser to weld, and sequentially passing the laser from the air knife through the first light hole, the upper through hole, the lens 104, the lower through hole and the second light hole and then emitting from the third light hole; in the use process, the operation parameters of the device are as follows:
1. when the detected temperature is a constant value of a certain temperature within 20-30 ℃ and the temperature rising speed of the lens 104 is V less than or equal to 0.01 ℃/S in the heating process, the lens 104 is protected from being clean and pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
2. when the detected temperature is a constant value of a certain temperature within 20-30 ℃, and the temperature rising speed of the lens 104 in the heating process is 0.01 ℃/S less than or equal to V less than or equal to 0.02 ℃/S, the lens 104 is protected from small particle splashing pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
3. When the detected temperature is 30-50 ℃ and a certain temperature value is constant, and the temperature rising speed of the lens 104 in the heating process is 0.02 ℃/S less than or equal to V less than or equal to 0.05 ℃/S, the lens 104 is protected from smoke dust pollution, cleaning is needed after stopping, and a temperature curve graph of the current time and the temperature change process is recorded;
4. When the detected temperature is 40-70 ℃ and a certain temperature value is constant, and the temperature rising speed of the lens 104 is 0.05 ℃/S less than or equal to V less than 0.5 ℃/S in the heating process, the protective lens 104 is polluted by large particle splashing, the protective lens 104 needs to be cleaned immediately, and a temperature curve graph of the current time and the temperature change process is recorded;
5. When the detected temperature rising speed of the lens 104 in the heating process is greater than 0.5 ℃/S, the lens 104 is cracked and damaged and needs to be immediately stopped for replacement, and a temperature curve chart of the current time and the temperature change process is recorded;
Step four: when the machine is stopped for cleaning, the lens holding mechanism 1 is pulled out of the temperature sensor holding mechanism 2, the lens 104 is taken out for cleaning, after the cleaning is finished, the lens 104 is put back into the lens holding mechanism 1, and the lens holding mechanism 1 is pushed into a channel of the temperature sensor holding mechanism 2 for repeating the operation of the third step;
Step five: when the replacement of the lens 104 is stopped, the lens holding mechanism 1 is pulled out from the temperature sensor holding mechanism 2, the lens 104 is taken out, the lens 104 is replaced with a new one, the lens 104 is returned to the lens holding mechanism 1, and the lens holding mechanism 1 is pushed into the passage of the temperature sensor holding mechanism 2, and the operation of the third step is repeated.
And step three, feeding the real-time temperature value measured in the step three back to an upper computer in welding production equipment, calculating the temperature change speed by the upper computer, and giving a corresponding alarm by the upper computer if the temperature change speed and the temperature value reach set conditions.
In this embodiment, the frame holder 202 is bolted to the laser head connecting piece 201, the temperature sensor guide 203 is locked to the frame holder 202, the temperature sensor assembly 3 is inserted into the mounting hole of the temperature sensor guide 203, and the resistance welding plate 302 is locked to the bottom surface of the frame holder 202. The temperature sensor support plate 204 is fastened to the temperature sensor guide 203 by bolts passing through the lower end of the thermal resistor 301. The resistor connection plate is pressed against the frame holder 202 by the elastic force of the spring 303. The lens holding mechanism 1 can be detached from the frame holder 202 by pressing down the thermal resistor 301 connection plate with a tool.
In this embodiment, the protection lens 104 states are divided into five types: clean and pollution-free, small particle splashing pollution, smoke pollution, large particle splashing pollution and crack damage. The state of the protective lens 104 can be predicted by directly detecting the real-time temperature and the temperature rising speed of the protective lens 104.
Embodiments are described below:
The lens holding mechanism 1 is placed in the temperature sensor holding mechanism 2, and the temperature sensor assembly 3 presses the thermal resistor 301 against the lens 104 by the force of the spring 303, thereby measuring the temperature of the lens 104.
In the detection method, in the laser welding operation process, laser penetrates through the protective lens 104, more than 99.9% of the laser can penetrate through the protective lens 104, the rest of the laser is absorbed by the protective lens 104, and the temperature of the laser absorbed by the lens 104 can rise. The protective lens 104 is operated in different states, and the transmittance of the laser from the protective lens 104 is different, so that the temperature and the temperature rising speed of the protective lens 104 are different during the operation. According to the principle, the temperature and the temperature rising speed of the protective lens 104 in the operation process are detected in real time to judge the operation state of the protective lens 104, so that the aim of early warning is fulfilled. The operating parameters are as follows:
Referring to fig. 9, when the lens 104 is clean and pollution-free, after a period of time, the temperature of the lens 104 is slightly higher than the ambient temperature and is kept below 30 ℃ (in this embodiment, the temperature change range of the state is 20-30 ℃) constant, and the temperature rising speed V is less than or equal to 0.01 ℃/S during the heating process of the lens 104, at this time, the lens 104 is only affected by the film coating transmittance on the surface of the lens 104, and stable heat exchange is formed with the outside, so that the welding process is not affected.
Referring to fig. 10, when there is small particle splash contamination of the lens 104: after the continuous operation is performed for a period of time, the temperature of the lens 104 is slightly higher than the ambient temperature after the temperature is raised, and in the embodiment, the temperature change range of the state is 20-30 ℃ below zero, and the temperature rise speed of the cleaner and nondestructive protective lens 104 is slightly higher than the temperature rise speed of 0.01 ℃/S and less than or equal to V and less than or equal to 0.02 ℃/S in the temperature rise process, so that the welding process is not influenced, and the lens 104 is in a state to be cleaned.
Referring to fig. 11, when there is smoke contamination of the lens 104, one side of the protective lens 104 is covered with a thin weld smoke. After the continuous working period, the detected temperature of the lens 104 is constant at a certain value between 30 ℃ and 50 ℃, the temperature of the lens 104 is protected to form stable heat exchange with the outside, and in the temperature rising process, the temperature rising speed is 0.02 ℃/S less than or equal to V less than or equal to 0.05 ℃/S, at the moment, the welding process is not influenced, and the lens 104 is in a state to be cleaned.
Referring to fig. 12, when the lens 104 is contaminated by large particles, the large particles block the main light path after a period of operation, the detected temperature rising speed is rapidly increased, V is less than or equal to 0.05 ℃/S and less than 0.5 ℃/S, after the real-time temperature is stabilized between 40 ℃ and 70 ℃, the temperature of the protective lens 104 can form stable heat exchange with the outside, the temperature is not increased any more, but if the lens 104 is continuously operated, the lens 104 is easy to crack and break, and at the moment, the protective lens 104 is in a limit state, and the protective lens 104 needs to be replaced immediately.
Referring to fig. 13, when the lens 104 is cracked and broken, the real-time temperature increases rapidly at a speed exceeding 0.5 ℃/S, and the light needs to be turned off immediately, otherwise, the laser is easily reflected back along the original optical path, and irreversible damage is caused to the laser system.
The foregoing detailed description is directed to embodiments of the invention which are not intended to limit the scope of the invention, but rather to cover all modifications and variations within the scope of the invention.
Claims (3)
1. A laser protection lens temperature detection device is characterized in that: comprises a lens holding mechanism, a temperature sensor holding mechanism and a temperature sensor assembly; the lens is clamped on the lens holding mechanism, and the lens holding mechanism is detachably inserted into the temperature sensor holding mechanism and can slide along the temperature sensor holding mechanism; the temperature sensor assembly comprises a thermal resistor, the temperature sensor assembly is installed in the temperature sensor holding mechanism, and the thermal resistor is tightly contacted with the lens under the action of the temperature sensor assembly; the lens holding mechanism is provided with a through hole, the center of the lens is positioned on the through hole, the temperature sensor holding mechanism is provided with a light hole opposite to the through hole, and laser from the air knife is emitted after passing through the through hole and the light hole;
the lens holding mechanism comprises a lens holder pressing plate, a lens holder and an elastic pressing sheet made of elastic materials; the glasses frame is of an L-shaped structure, the through holes comprise an upper through hole and a lower through hole, and the lower through hole is formed in the glasses frame; the upper through hole is formed in the spectacle frame pressing plate, and a plurality of elastic pressing sheets are arranged at the lower end of the spectacle frame pressing plate; the lens is placed on the lens frame, the lens frame pressing plate is buckled on the lens, the plurality of elastic pressing sheets are contacted with and press the lens, and the lens frame pressing plate and the lens frame are buckled and locked up and down to form a smooth block structure;
The elastic pressing plates are provided with four, the lower ends of the glasses frame pressing plates are provided with a pair of mounting grooves, the two mounting grooves are distributed in a crisscross manner, and the upper through holes penetrate through the mounting grooves; one end of the elastic pressing piece is locked in the mounting groove, and the other end of the elastic pressing piece is higher than the bottom surface of the pressing plate of the glasses frame; when the spectacle frame pressing plate is locked on the spectacle frame, the elastic pressing plate is deformed and pressed on the lens;
The temperature sensor retaining mechanism comprises a laser head connecting piece provided with a first light hole, a lens holder retainer, a temperature sensor guide frame provided with a second light hole and a temperature sensor supporting plate provided with a third light hole; the lens holder is provided with a channel which is matched with the lens holding mechanism in shape and is used for the lens holding mechanism to freely enter and exit; the first light holes, the second light holes and the third light holes are opposite in position; the laser head connecting piece, the mirror bracket retainer, the temperature sensor guide frame and the temperature sensor support plate are sequentially distributed from top to bottom; the temperature sensor guide frame is provided with a guide groove for installing the temperature sensor component, and the temperature sensor guide frame and the temperature sensor support plate form a guide mechanism of the temperature sensor component up and down.
2. The laser protection lens temperature detection device according to claim 1, wherein: the temperature sensor assembly further comprises a spring and a resistance welding plate; the temperature sensor supporting plate is provided with a mounting hole; the resistance welding plate is welded at the upper end of the thermal resistor, and the lower end of the thermal resistor is inserted into the mounting hole of the temperature sensor supporting plate; the spring is sleeved at the outer end of the thermal resistor, the lower end of the spring is propped against the temperature sensor supporting plate, the upper end of the spring is propped against the resistance welding plate, the resistance welding plate and the thermal resistor are positioned in the guide groove, and the movable space of the resistance welding plate is positioned in the guide groove between the lens holder retainer and the temperature sensor supporting plate; the thermal resistor is tightly contacted with the lens under the action of the spring.
3. The method for detecting the temperature of the laser protection lens according to claim 2, comprising the following steps:
Step one: the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens holder is separated from the lens holder pressing plate, lenses are placed on the lens holder, the lens holder pressing plate is buckled on the lenses, the elastic pressing plate is stirred to enable the lenses to be buckled and compressed, and the lens holder pressing plate is buckled and locked with the lens holder;
step two: pushing the lens holding mechanism into a channel of the temperature sensor holding mechanism, and tightly contacting the thermal resistor of the temperature sensor assembly with the lens under the action of a spring;
step three: starting laser to weld, and sequentially passing the laser from the air knife through the first light hole, the upper through hole, the lens, the lower through hole and the second light hole and then emitting from the third light hole; in the use process, the operation parameters of the device are as follows:
1. When the detected temperature is a constant value of a certain temperature within 20-30 ℃ and the temperature rising speed of the lens in the temperature rising process is V less than or equal to 0.01 ℃/S, the lens is protected from being clean and pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
2. When the detected temperature is a constant value of a certain temperature within 20-30 ℃, and the temperature rising speed of the lens in the heating process is 0.01 ℃/S less than or equal to V less than or equal to 0.02 ℃/S, the lens is protected from small particle splashing pollution, and a temperature curve graph of the current time and the temperature change process is recorded;
3. When the detected temperature is 30-50 ℃ and a certain temperature value is constant, and the temperature rising speed in the process of heating the lens is 0.02 ℃/S less than or equal to V less than or equal to 0.05 ℃/S, the lens is protected from smoke dust pollution, cleaning is needed after the lens is stopped, and a temperature curve graph of the current time and the temperature change process is recorded;
4. When the detected temperature is 40-70 ℃ and a certain temperature value is constant, and the temperature rising speed in the process of heating the lens is 0.05 ℃/S less than or equal to V less than 0.5 ℃/S, the protective lens is polluted by large particle splashing, the protective lens is required to be cleaned immediately, and a temperature curve graph of the current time and the temperature change process is recorded;
5. When the detected temperature rising speed of the lens in the heating process is greater than 0.5 ℃/S, the lens is cracked and damaged, the lens needs to be immediately stopped for replacement, and a temperature curve chart of the current time and the temperature change process is recorded;
Step four: when the machine is stopped for cleaning, the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens is taken out for cleaning, after the cleaning is finished, the lens is put back into the lens holding mechanism, and the lens holding mechanism is pushed into a channel of the temperature sensor holding mechanism for repeating the operation of the third step;
Step five: when the machine is stopped to replace the lens, the lens holding mechanism is pulled out from the temperature sensor holding mechanism, the lens is taken out, a new lens is replaced, the lens is installed back to the lens holding mechanism, and the lens holding mechanism is pushed into a channel of the temperature sensor holding mechanism to repeat the operation of the third step.
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| CN112030154B (en) * | 2020-07-28 | 2022-10-14 | 陕西天元智能再制造股份有限公司 | Laser cladding head self preservation protects device |
| CN112080740A (en) * | 2020-09-11 | 2020-12-15 | 陕西天元智能再制造股份有限公司 | Cladding head protective mirror drawer device with temperature display function |
| CN113390885B (en) * | 2021-08-17 | 2021-11-09 | 济南邦德激光股份有限公司 | Laser head cutting protective glass state detection device and detection method |
| CN113523544A (en) * | 2021-08-24 | 2021-10-22 | 深圳市睿利汉深激光设备有限公司 | Single-vibrating-mirror type multipurpose optical fiber welding handheld gun |
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