WO2020073340A1

WO2020073340A1 - Laser welding system employing protective water-cooling and operating method thereof

Info

Publication number: WO2020073340A1
Application number: PCT/CN2018/110149
Authority: WO
Inventors: 王小绪; 孔见; 王应静; 王栓林; 王力
Original assignee: 南京理工大学
Priority date: 2018-10-10
Filing date: 2018-10-12
Publication date: 2020-04-16
Also published as: CN109332888A

Abstract

A laser welding system employing protective water-cooling, comprising: a cloud server and a control module, and a welding mechanism and a water-cooling mechanism that are connected to the control module respectively; wherein the welding mechanism comprises: a laser emitter that emits laser beams by means of an emitter tube, an air stream nozzle sleeved around the outside of the emitter tube, and a high-pressure air source connected to the air stream nozzle; wherein a tube wall of the emitter tube is a hollow structure such that the water-cooling mechanism forces a circulating cooling water into the tube wall of the emitter tube, and the cloud server is adapted for storing a water-cooling parameter and transmitting the same to the control module by means of a wireless communication module to control the water-cooling mechanism to operate. The present invention further relates to an operating method of a laser welding system. The laser welding system and the operating method can reduce the temperature of an emitter tube and increase the service life of a laser emitter.

Description

Laser welding system suitable for water cooling protection and its working method

Technical field

The invention relates to the technical field of welding equipment, in particular to a laser welding system suitable for water cooling protection and a working method thereof.

Background technique

Laser welding is to attach a laser emitter and so on the shaft flange of the welding mechanism to align the welded parts, so that the welded parts can be welded, cut or thermally sprayed. The power, focal length and stability of the laser beam will affect the welding Quality, especially affects the range of heat affected zone and the size and depth of the molten pool. Due to the large heat of the laser beam, if used for a long time in the welding process, it is easy to cause the launch tube to overheat or even damage. This makes laser welding mostly use segment welding when welding long welds, which reduces the production efficiency and the laser emitter. Service life.

Summary of the invention

The purpose of the present invention is to provide a laser welding system suitable for water cooling protection and its working method. The cooling water is passed into the wall of the launch tube through the water cooling mechanism to reduce the temperature of the launch tube and increase its service life.

In order to solve the above technical problems, the present invention provides a laser welding system, including: a cloud server and a control module, and a welding mechanism and a water cooling mechanism respectively connected to the control module; wherein the welding mechanism includes: emitting a laser beam through a launch tube The laser emitter, the airflow nozzle on the side of the launch tube and the high-pressure air source connected to the airflow nozzle; the wall of the launch tube is hollow structure, suitable for water cooling mechanism to pass into the launch tube wall for cooling Water; and the cloud server is suitable for storing water cooling parameters and sending them to the control module through the wireless communication module to control the water cooling mechanism to work.

Further, the wireless communication module includes: a dual-frequency dual circularly polarized antenna; wherein the dual-frequency dual circularly polarized antenna includes: a left-handed metamaterial, an omnidirectional dual-frequency linearly polarized antenna on the upper surface of the left-handed metamaterial, and a medium An air matching layer between the two; the left-hand metamaterial includes: a first dielectric substrate, and a metal unit array and a metal layer respectively located on the upper and lower surfaces of the first dielectric substrate; The metal units are arranged from top to bottom and from left to right.

Further, the metal unit includes: two rectangular metal parts that are symmetrical in the center, that is, first and second rectangular metal parts; the rectangular metal part includes: a double U-shaped arm and an L-shaped arm disposed outside the double U-shaped arm Resonant patch; the double U-shaped arm includes: first and second U-shaped arms connected end to end; the tail end of the first U-shaped arm is vertically connected to the head end of the second U-shaped arm; and two The head end of the first U-shaped arm of the rectangular metal part is adapted to extend and connect to the symmetric centers of the two rectangular metal parts.

Further, each metal unit is adapted to be distributed in parallel from left to right, and the second rectangular metal part is located directly under the first rectangular metal part of the adjacent metal unit.

Further, the geometric center of the left-hand metamaterial is on the same straight line as the center of the omnidirectional dual-frequency linear polarization antenna.

Further, the omnidirectional dual-frequency linearly polarized antenna is a planar monopole printed antenna fed by a coplanar waveguide.

Further, the planar monopole printed antenna includes: a second dielectric substrate, first, second, and third rectangular metal radiating portions and a polygonal metal radiating portion respectively located on the upper surface of the second dielectric substrate; the polygonal metal radiating portion It is a centrally symmetric structure and includes: an irregular pentagonal hollow metal patch, an H-shaped hollow radiating unit, and an inverted U-shaped resonance slot; the third rectangular metal radiating portion is suitable for the first and second rectangular metal radiating portions Through the gap so that one end is connected to the vertex of the irregular pentagonal hollow metal patch, and the other end is connected to the middle of one side of the second dielectric substrate; and the first and second rectangular metal radiating parts are located at the The two corners of the side.

Further, the second dielectric substrate is suitable for using a polytetrafluoroethylene single-sided copper clad laminate, the thickness of which is 0.8-0.9 mm, and the dielectric constant is 4-5.

Further, the thickness of the left-hand metamaterial is 0.015-0.020 mm; and

The dielectric constant of the first dielectric substrate is 4-5.

In another aspect, the present invention also provides a working method of a laser welding system, including: a cloud server and a control module, and a welding mechanism and a water cooling mechanism respectively connected to the control module; the cloud server is suitable for storing water cooling parameters, and It is sent to the control module through the wireless communication module to control the water cooling mechanism to perform water cooling protection on the welding mechanism.

The beneficial effect of the present invention is that when the welding mechanism of the present invention performs gas shielded welding, circulating cooling water is passed into the wall of the launch tube through the water cooling mechanism to reduce the temperature of the launch tube, which can not only extend the laser welding The duration of the laser can also increase the service life of the laser transmitter; in addition, the water cooling parameters are stored by the cloud server and sent to the control module by the wireless communication module, which reduces the dependence of the welding process on people and improves the degree of automation and production efficiency .

BRIEF DESCRIPTION

The present invention will be further described below with reference to the drawings and embodiments.

FIG. 1 is a functional block diagram of the laser welding system of the present invention;

2 is a schematic structural view of the dual-frequency dual-circular polarization antenna of the present invention;

3 is a schematic diagram of the structure of the left-handed metamaterial of the present invention;

4 is a schematic structural view of the metal unit of the present invention;

In the picture: left-handed metamaterial 1, omnidirectional dual-frequency linearly polarized antenna 2, second dielectric substrate 21, first rectangular metal radiator 22, second rectangular metal radiator 23, third rectangular metal radiator 24, polygonal metal Radiation part 25, irregular pentagonal hollow metal patch 251, H-shaped hollow radiation unit 252, inverted U-shaped resonance slit 253, first dielectric substrate 3, metal unit 4, first rectangular metal part 41, second rectangular metal Part 42, a first U-shaped arm 421, a second U-shaped arm 422, an L-shaped resonant patch 423.

detailed description

The present invention will now be described in further detail with reference to the drawings. These drawings are simplified schematic diagrams and only illustrate the basic structure of the present invention in a schematic manner, so they only show the configuration related to the present invention.

Example 1

FIG. 1 is a functional block diagram of the laser welding system of the present invention.

As shown in FIG. 1, this embodiment 1 provides a laser welding system, including: a cloud server and a control module, and a welding mechanism and a water cooling mechanism respectively connected to the control module; wherein the welding mechanism includes: launching through a launch tube The laser emitter of the laser beam, the airflow nozzle coated on the side of the launch tube and the high-pressure gas source connected to the airflow nozzle; the wall of the launch tube is hollow structure, which is suitable for the water cooling mechanism to pass into the wall of the launch tube Circulating cooling water; and the cloud server is adapted to store water cooling parameters and send them to the control module through the wireless communication module to control the water cooling mechanism to work. Specifically, water inlets and water outlets are provided at the wall of the launch tube; the water cooling mechanism includes but is not limited to a water pump, the water inlet of which is connected to the water storage tank for circulating cooling water, and the water outlet of the water pipe is connected to the water inlet of the launch tube Connected to pass circulating cooling water into the wall of the launch tube; and the outlet of the launch tube is connected to the water storage tank through the outlet pipe to lead the circulating cooling water out of the launch tube to take away the launch through the circulating cooling water The heat of the tube reduces its temperature.

Optionally, the gas flow nozzle is connected to a high-pressure gas source through a gas pipeline, and an electromagnetic valve is provided at the junction of the high-pressure gas source and the gas pipeline to control the amount of gas flow. When welding, first open the electromagnetic valve to spray protective gas for 30 to 50 seconds, then exhaust the air around the weld, and then turn on the laser emitter to emit laser beam to weld.

Optionally, the cloud server can be remotely controlled by a PC to input and store water cooling parameters to the cloud server; and the water cooling parameters include but are not limited to: the power of the water pump; and the power of the water pump and the laser beam The power is positively related. The power of the pump can be adjusted by the control module to increase or decrease the amount of circulating cooling water. This can not only ensure the normal working temperature of the launch tube, prevent its damage, but also avoid excessive water volume and waste of energy.

Optionally, the control module is, for example but not limited to, a 51 single-chip microcomputer, which can control the laser emitter, electromagnetic valve, and water pump to work through corresponding drive circuits.

In the laser welding system of the first embodiment, when gas welding is performed in the welding mechanism, circulating cooling water is passed into the wall of the launch tube through the water cooling mechanism to reduce the temperature of the launch tube, which not only can extend the duration of laser welding, but also The service life of the laser transmitter can be increased; in addition, the water cooling parameters are stored by the cloud server and sent to the control module by the wireless communication module, which reduces the dependence of the welding process on people and improves the degree of automation and production efficiency.

2 is a schematic diagram of the structure of the dual-frequency dual-circular polarization antenna of the present invention.

3 is a schematic diagram of the left-hand metamaterial of the present invention.

As an alternative implementation of dual-frequency dual-circular polarization antenna.

2 and 3, the wireless communication module includes: a dual-frequency dual-circularly polarized antenna; wherein the dual-frequency dual-circularly polarized antenna includes: a left-handed metamaterial 1, an omnidirectional dual on the upper surface of the left-handed metamaterial 1 Frequency-line polarized antenna 2 and an air matching layer between them (located on the lower surface of the omnidirectional dual-frequency linear-polarized antenna, not shown in FIG. 2); the left-handed metamaterial 1 includes: a first medium Substrate 3, and metal unit arrays and metal layers on the upper and lower surfaces of the first dielectric substrate 3 (located on the lower surface of the first dielectric substrate, not shown in FIG. 3); The units 4 are arranged from top to bottom and from left to right.

Optionally, the thickness of the left-hand metamaterial 1 is 0.015 to 0.020 mm, preferably 0.018 mm; and the dielectric constant of the first dielectric substrate is 4 to 5, preferably 4.6.

The dual-frequency dual-circularly polarized antenna of this embodiment is used by a left-handed metamaterial and an omnidirectional dual-frequency linearly polarized antenna, and the metal units of the left-handed metamaterial are arranged from top to bottom and from left to right (as shown in FIG. 3) ), Can realize left-handed circularly polarized wave and right-handed circularly polarized wave to form a circularly polarized antenna, which greatly simplifies the design difficulty of the dual-frequency dual-circularly polarized antenna while optimizing the antenna performance, and further improves the dual-frequency dual-circle The gain of the polarized antenna is to increase the water cooling parameter as the radiation intensity and range of the transmitted signal, and to ensure that the control module accurately receives the water cooling parameter. It has the characteristics of popular structure, simple process, flexible design, and strong functionality.

4 is a schematic structural diagram of a metal unit of the present invention.

As an alternative embodiment of the metal unit.

Referring to FIG. 4, the metal unit 4 includes two rectangular metal parts that are symmetrical in the center, that is, a first rectangular metal part 41 and a second rectangular metal part 42, and the structures of the two rectangular metal parts are the same. Specifically, the structure of the metal unit 4 will be described by taking the second rectangular metal 42 in FIG. 4 as an example, that is, the second rectangular metal 42 includes: a double U-shaped arm and an outer side of the double U-shaped arm L-shaped resonant patch 423; the double U-shaped arm includes: first and second U-shaped arms connected end to end, and the opening end of the first U-shaped arm 421 is symmetric toward the center (upper in FIG. 4), the first The open end of the two U-shaped arms 422 faces the first U-shaped arm 421 (right side in FIG. 4); the tail end of the first U-shaped arm 421 is vertically connected to the head end of the second U-shaped arm 422; and two The head end of the first U-shaped arm 421 of the rectangular metal part is adapted to extend and connect to the symmetric centers of the two rectangular metal parts.

Optionally, in a single metal unit, there is a first gap between the two L-shaped resonant patches and the corresponding double U-shaped arms, and the center of the two first slots and the center of the ring (L-shaped resonant patch The intersection of the extension lines of the sheet) constitutes an L-shaped fold line.

Optionally, each metal unit 4 is suitable for parallel distribution from left to right; the second rectangular metal portion 42 is located directly under the first rectangular metal portion 41 of the adjacent metal unit 4, and there is a second Two gaps.

The metal unit of this embodiment can not only improve the gain of the antenna by the two rectangular metal parts symmetrically arranged about the center, but also facilitate the arrangement of the second rectangular metal part directly under the first rectangular metal part of the adjacent metal unit to achieve The metal units are arranged from top to bottom and from left to right, so as to ensure that the left-hand metamaterial loading can form a circularly polarized antenna, and the radiation intensity and radiation range of the water cooling parameter are improved.

Further, the geometric center of the left-hand metamaterial 1 and the center of the omnidirectional dual-frequency linearly polarized antenna 2 are on the same straight line.

As an alternative embodiment of a planar monopole printed antenna.

Further, the omnidirectional dual-frequency linearly polarized antenna 2 may be a planar monopole printed antenna fed by a coplanar waveguide.

As shown in FIG. 2, the planar monopole printed antenna includes: a second dielectric substrate 21, a first rectangular metal radiation portion 22, a second rectangular metal radiation portion 23 and a third rectangular metal located on the upper surface of the second dielectric substrate 21 respectively The radiating portion 24 and the polygonal metal radiating portion 25; the polygonal metal radiating portion 25 is a center symmetrical structure, and includes: an irregular pentagonal hollow metal patch 251, an H-shaped hollow radiating unit 252, and an inverted U-shaped resonance slot 253; The third rectangular metal radiating portion 24 is adapted to pass through the gap between the first and second rectangular metal radiating portions, so that one end thereof is connected to the vertex of the irregular pentagonal hollow metal patch 251, and the other end is connected to the second medium The middle part of one side of the substrate 21 is connected; and the first and second rectangular metal radiating parts are located at two corners of the side respectively.

Optionally, as shown in FIG. 2, the H-shaped hollow radiating unit 252 is composed of first, second, and third hollow structures, where the first and second hollow structures are arranged in parallel (in FIG. 2, they are vertically parallel) The third hollow structure is arranged in the middle of the first and second hollow structures, and the first and second hollow structures are both perpendicular to the third hollow structure.

Optionally, there is an air matching layer between the lower surface of the second dielectric substrate 21 and the upper surface of the first dielectric substrate 3.

Optionally, the second dielectric substrate 21 is suitable for using a polytetrafluoroethylene single-sided copper clad laminate, and its thickness is 0.8-0.9 mm, preferably 0.86 mm; and the dielectric constant is 4-5, preferably 4.6.

The first dielectric substrate, the second dielectric substrate, and the left-hand metamaterial in this application all have limitations on thickness and dielectric constant. If the thickness is too large, it not only affects the overall size of the antenna, but also may cause electromagnetic shielding caused by the metal layer and affect the gain effect of the antenna; if the thickness is too small, it will affect the strength of the antenna and will be easily bent, thus affecting normal installation and use Even changing the gain of the antenna.

The planar monopole printed antenna of this embodiment is used in conjunction with the first, second, and third rectangular metal radiating portions and polygonal metal radiating portions provided on the second dielectric substrate to improve the antenna gain state and ensure water cooling parameters The radiation intensity and radiation range of the system improve the receiving accuracy of the control module and the response speed of the laser welding system.

In summary, when the laser welding system of the present application performs gas shielded welding in the welding mechanism, circulating cooling water is passed into the wall of the launch tube through the water cooling mechanism to reduce the temperature of the launch tube, which can not only extend the duration of laser welding Time can also increase the service life of the laser transmitter; in addition, the water cooling parameters are stored through the cloud server and sent to the control module by the wireless communication module, which reduces the dependence of the welding process on people and improves the degree of automation and production efficiency; The dual-band circularly polarized antenna is used by left-handed metamaterials and omnidirectional dual-frequency linearly polarized antennas. The metal elements of the left-handed metamaterials are arranged from top to bottom and from left to right (as shown in Figure 3). Circularly polarized waves and right-handed circularly polarized waves form circularly polarized antennas, which greatly simplifies the design difficulty of dual-frequency dual-circularly polarized antennas while optimizing antenna performance, and further improves the gain of dual-frequency dual-circularly polarized antennas In order to improve the water cooling parameters as the radiation intensity and range of the transmitted signal, to ensure that the control module receives the water cooling parameters accurately, it has a popular structure and simple process Flexible design, strong functionality, etc .; the planar monopole printed antenna is used in conjunction with the first, second and third rectangular metal radiating parts and polygonal metal radiating parts provided on the second dielectric substrate to improve the antenna gain state , To ensure the radiation intensity and radiation range of the water cooling parameter, improve the receiving accuracy of the control module, and improve the response speed of the laser welding system.

Example 2

Based on Embodiment 1, this Embodiment 2 provides a working method of a laser welding system, including: a cloud server and a control module, and a welding mechanism and a water cooling mechanism respectively connected to the control module; the cloud server is suitable for The water cooling parameters are stored and sent to the control module through the wireless communication module to control the water cooling mechanism to perform water cooling protection on the welding mechanism.

For the specific structure and implementation process of the laser welding system, please refer to the relevant discussion of Embodiment 1, which will not be repeated here.

Taking the above-mentioned ideal embodiment according to the present invention as a revelation, through the above description, relevant staff can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents of the description, and the technical scope must be determined according to the scope of the claims.

Claims

A laser welding system, characterized in that it includes:

Cloud server and control module, and welding mechanism and water cooling mechanism respectively connected to the control module;

The welding mechanism includes: a laser emitter that emits a laser beam through a launch tube, an airflow nozzle that is coated on the side of the launch tube, and a high-pressure gas source connected to the airflow nozzle;

The wall of the launch tube is of a hollow structure, and the circulating cooling water is passed into the wall of the launch tube by a water cooling mechanism; and

The cloud server is suitable for storing water cooling parameters and sending them to the control module through a wireless communication module to control the water cooling mechanism to work.
The laser welding system according to claim 1, wherein

The wireless communication module includes: a dual-frequency dual-circular polarization antenna; wherein

The dual-frequency dual-circular polarization antenna includes: a left-handed metamaterial, an omnidirectional dual-frequency linearly polarized antenna on the upper surface of the left-handed metamaterial, and an air matching layer between the two;

The left-handed metamaterial includes: a first dielectric substrate, and metal cell arrays and metal layers on the first dielectric substrate and the lower surface, respectively; and

The metal unit array is composed of several metal units arranged from top to bottom and from left to right.
The laser welding system according to claim 2, wherein:

The metal unit includes: two rectangular metal parts that are symmetrical in the center, that is, first and second rectangular metal parts;

The rectangular metal part includes: a double U-shaped arm and an L-shaped resonance patch disposed outside the double U-shaped arm;

The double U-shaped arm includes: first and second U-shaped arms connected end to end;

The tail end of the first U-shaped arm is vertically connected to the head end of the second U-shaped arm; and

The head ends of the first U-shaped arms of the two rectangular metal parts are adapted to extend and connect to the center of symmetry of the two rectangular metal parts.
The laser welding system according to claim 3, characterized in that

Each metal unit is adapted to be distributed in parallel from left to right, and the second rectangular metal part is located directly under the first rectangular metal part of the adjacent metal unit.
The laser welding system according to claim 2, wherein:

The geometric center of the left-hand metamaterial is on the same straight line as the center of the omnidirectional dual-frequency linear polarization antenna.
The laser welding system according to claim 5, characterized in that

The omnidirectional dual-frequency linearly polarized antenna is a planar monopole printed antenna fed by a coplanar waveguide.
The laser welding system according to claim 6, characterized in that

The planar monopole printed antenna includes: a second dielectric substrate, first, second, and third rectangular metal radiating portions and polygonal metal radiating portions respectively located on the upper surface of the second dielectric substrate;

The polygonal metal radiating portion has a center symmetrical structure, and includes: an irregular pentagonal hollow metal patch, an H-shaped hollow radiating unit, and an inverted U-shaped resonance slot;

The third rectangular metal radiating portion is adapted to pass through the gap between the first and second rectangular metal radiating portions, so that one end thereof is connected to the vertex of the irregular pentagonal hollow metal patch, and the other end is connected to the second dielectric substrate. A central connection on one side; and

The first and second rectangular metal radiating parts are respectively located at two corners of the side.
The laser welding system according to claim 7, characterized in that

The second dielectric substrate is suitable to use a polytetrafluoroethylene single-sided copper clad laminate, the thickness of which is 0.8-0.9 mm, and the dielectric constant is 4-5.
The laser welding system according to claim 2, wherein:

The thickness of the left-hand metamaterial is 0.015 to 0.020 mm; and

The dielectric constant of the first dielectric substrate is 4-5.
A working method of a laser welding system, characterized in that it includes:

Cloud server and control module, and welding mechanism and water cooling mechanism respectively connected to the control module;

The cloud server is suitable for storing water cooling parameters and sending them to the control module through a wireless communication module to control the water cooling mechanism to perform water cooling protection on the welding mechanism.