CN111889854A

CN111889854A - Laser cleaning welding trolley and control method

Info

Publication number: CN111889854A
Application number: CN202010683550.3A
Authority: CN
Inventors: 刘桑; 许斌
Original assignee: Guangzhou Wenchong Shipyard Co Ltd
Current assignee: Guangzhou Wenchong Shipyard Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2020-11-06
Anticipated expiration: 2040-07-15
Also published as: CN111889854B

Abstract

The invention relates to the technical field of ship welding and laser cleaning, and discloses a laser cleaning welding trolley and a control method thereof. The invention realizes the synchronous automatic cleaning of the groove area during welding, ensures the cleanness and the thoroughness of the groove area and improves the quality of welding seams.

Description

Laser cleaning welding trolley and control method

Technical Field

The invention relates to the technical field of ship welding and laser cleaning, in particular to a laser cleaning welding trolley and a control method.

Background

The steel plate for the shipbuilding factory and the ship is generally coated with workshop primer before welding, and the workshop primer which is dry and has the film thickness meeting the specification requirement of classification society can be directly welded without removing the welding cover. But limited by production conditions, the condition that the film thickness exceeds the standard exists in the primer of workshop on the steel plate when spraying, and can adsorb moisture in the transportation, stacking process, and the groove area can adhere to have rust, if the groove area is not cleaned before welding, can influence the welding seam quality. When traditionally adopting polisher to clear away priming paint and iron rust, because circular abrasive disc is the line contact with the steel sheet, there is the not thorough problem of polishing in dead angle position, and the noise is big when simultaneously polishing and clear away, and the subsidiary production metal sweeps pollutes, and the operation environment is poor. And a grinding process is specially added before welding, and after grinding, when welding is not timely performed due to an emergency, a grinding area is possibly polluted again and needs to be ground again.

Disclosure of Invention

The purpose of the invention is: the synchronous automatic cleaning of the groove area is realized during welding, the cleanness and the thoroughness of the groove area are ensured, and the quality of a welding seam is improved.

In order to achieve the purpose, the invention provides a laser cleaning welding trolley which comprises a trolley body, wherein a cross beam is arranged on the trolley body, a welding assembly and a laser assembly are arranged on the cross beam, a control panel is also arranged on the cross beam, a control system is arranged in the control panel, the welding assembly and the laser assembly are both electrically connected with the control system, the laser assembly is rotatably arranged on the cross beam, and the laser assembly rotates to perform laser pre-cleaning on an area to be welded before welding.

Further, the laser assembly includes a laser head, a rotatable optical lens group is arranged in the laser head.

Further, when the laser assembly is rotated for pre-cleaning, the minimum included angle between the laser beam and the horizontal plane is 50-60 degrees.

Furthermore, a driving assembly is further arranged on the cross beam, and the driving assembly is connected with the laser assembly and controls the laser assembly to rotate.

Further, the welding subassembly includes funnel, wire feeder and solder flux cover, wire feeder installs the crossbeam below, the solder flux cover with wire feeder connects and sets up in the wire feeder below, the funnel sets up wire feeder one side.

Furthermore, a pillar is arranged between the vehicle body and the cross beam, the cross beam is slidably mounted at the upper end of the pillar, and the vehicle body is fixedly mounted at the bottom of the pillar.

Furthermore, an automatic zooming system is arranged in the laser head.

A control method for cleaning a welding trolley based on laser is characterized by comprising the following steps:

s1, adjusting the welding assembly and the laser assembly to align to the position needing welding;

s2, controlling the system to start a pre-cleaning program, starting the laser assembly to emit laser, and controlling the laser assembly to swing back and forth towards the welding assembly to clean;

and S3, after the pre-cleaning is finished, the laser is turned off, the laser assembly is reset, the welding assembly is started to start welding, the laser assembly is restarted to emit laser to clean in the welding process, and the vehicle body starts to walk.

Further, laser subassembly includes laser head and motor, the laser head with the power take off end of motor is connected, motor slidable mounting is in on the crossbeam, be provided with rotatable optics lens group in the laser head in step S3, when laser subassembly restart sent laser and cleaned, 360 degrees rotations of optics lens group in the system control laser head.

Furthermore, an automatic zooming system is arranged in the laser head, when the laser assembly is pre-cleaned in the step S1 and the laser scans the surface of the cleaning area, the focal length of the emitted laser is adjusted between the minimum focal length and the maximum focal length in real time, and the focal length values of the minimum focal length and the maximum focal length are both within 150 mm-200 mm.

Further, the rotation period T of the optical lens group needs to satisfy the following relationship:

wherein W is the width of the cleaning area, A is the laser width, and V is the trolley travel speed.

Compared with the prior art, the laser cleaning welding trolley and the control method thereof provided by the invention have the beneficial effects that: the laser assembly is added on the conventional submerged arc welding trolley, a welding area can be pre-cleaned by rotating the laser assembly before welding, automatic laser cleaning can be performed while welding, the quality of a welding line is ensured on the basis of ensuring thorough and rapid cleaning, welding is realized after a groove is cleaned, and the problem of secondary pollution and polishing of the groove is avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the laser cleaning welding carriage of the present invention;

FIG. 2 is a schematic view of the laser head of the laser cleaning welding carriage of the present invention in a swing state;

FIG. 3 is a schematic view of the laser rotation status of the laser cleaning welding carriage of the present invention.

In the figure, 1, a vehicle body; 2. welding the assembly; 201. a funnel; 202. a wire feeder; 203. a flux mask; 3. a laser assembly; 301. a laser head; 4. a cross beam; 5. a control panel; 6. a steel plate; 7. beveling; 701. a bevel edge; 702. a groove central line; 8. a pillar; 9. a drive assembly; b1, starting position of light spot; and B2, the light spot position after the trolley walks for 05T.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1: a laser cleaning welding trolley.

As shown in fig. 1, the laser cleaning welding tractor according to the preferred embodiment of the invention comprises a trolley body 1, wherein a cross beam 4 is arranged on the trolley body 1, a welding component 2 and a laser component 3 are mounted on the cross beam 4, the laser component 3 is rotatably mounted on the cross beam 4, a control panel 5 is further mounted on the cross beam 4, a control system is mounted in the control panel 5, and the welding component 2 is electrically connected with the control system. Laser subassembly 3 includes laser head 301, be provided with rotatable optics lens group and auto zoom system in the laser head 301, be provided with drive assembly 9 on the crossbeam 4, the preferred drive assembly 9 of this embodiment is the motor, laser head 301 with the power take off end of motor is connected, motor slidable mounting is in on the crossbeam 4, laser head 301 and motor all with control system signal connection.

Based on the above scheme, control system in control panel 5 is mainly controlled the holistic work flow of dolly, control system control welding subassembly 2 welded process, control system control laser head 301 starts emission laser, when laser head 301 launches laser, control system control motor starts to drive laser head 301 swing and realizes that the laser sweeps and penetrates cleanly, it is suitable to guarantee the laser facula focus that groove 7 was shone on whole thickness range at laser head 301 swing in-process, the energy is enough, the focus of laser is adjusted in real time to the automatic zoom system in laser head 301, and can realize that 360 degrees rotatory optical lens group then cleans groove 7 through the laser facula rotation in the welded time, clean effect has been guaranteed.

Preferably, the welding assembly 2 includes a funnel 201, a wire feeder 202 and a flux cover 203, the wire feeder 202 is installed below the beam 4, the flux cover 203 is connected with the wire feeder 202 and is disposed below the wire feeder 202, the funnel 201 is disposed on one side of the wire feeder 202, an output port is disposed at the bottom of the funnel 201, and the output direction of the output port is consistent with that of the flux cover 203. Submerged arc welding flux is placed in the funnel 201, the flux is conveyed to the flux hood 203 through an output port and falls on a groove 7 to be welded, welding wires are sent to the groove 7 through the wire feeding mechanism 202 to be welded, the whole welding process is automatically controlled by the control system, and the quality and the precision of a welding line are guaranteed.

Preferably, a pillar 8 is arranged between the vehicle body 1 and the cross beam 4, the cross beam 4 is slidably mounted at the upper end of the pillar 8, and the vehicle body 1 is fixedly mounted at the bottom of the pillar 8. The cross beam 4 and the strut 8 are slidably mounted, so that the extending length of the cross beam 4 can be adjusted according to needs, and the requirements of welding seams of steel plates 6 with different sizes can be met.

Preferably, for better laser cleaning effect, the laser type is fiber-transmittable Nd: YAG laser pulse, the last quick interface of cable and the quick interface of optic fibre that corresponds of setting up of laser head 301, the external system of being convenient for is inputed to laser head 301 through optic fibre. The laser that laser head 301 emitted is plane fan-shaped, and the facula of projecting on 6 surfaces of steel sheet is the banding, and facula length 40-100 mm is adjustable, and the each 20mm scope in both sides of groove 7 need be guaranteed to cover during actual work, so the rotation cycle of the interior optical lens group of laser head 301 when rotatory need satisfy following condition:

Preferably, the laser repetition frequency is 65-100 KHz adjustable (single pulse energy is 2 mJ), and the appropriate frequency can be selected according to different cleaning objects such as shop primer, rust, oil stain and the like.

Preferably, when the laser head 301 can swing back and forth along the welding line direction for pre-cleaning, the minimum included angle between the laser beam and the horizontal plane is 56 degrees when the laser head swings back, and the distance from the projection of the rotating shaft of the laser head to the center point of the welding wire is 156.5mm (as shown in fig. 2), so that the laser beam is not blocked during cleaning. When the center plane of the focusing lens at the outermost layer of the laser head 301 is parallel to the surface of the steel plate 6, the distance between the center of the lens and the front surface of the groove is set as the minimum focal length controlled by the system. When the laser head 301 swings to the maximum amplitude, the distance between the center of the lens and the surface of the steel plate 6 is set as the maximum focal length controlled by the system. The minimum focal length and the maximum focal length value are both in the range of 150 mm-200 mm. In actual production, the minimum focal length and the maximum focal length controlled by the system are reset by the laser head 301 after each adjustment. The trend of the focal length change is consistent with the trend of the distance between the lens and the surface of the steel plate 6, and the period of the focal length change is consistent with the period of the laser head 301 swinging.

The specific workflow of this embodiment is as follows: the positions of the welding component 2 and the laser component 3 are well adjusted at the groove 7, so that the welding wire is positioned on the middle line 702 of the groove when being output, the welding wire extends for 30-40 mm, the welding wire is not completely sent out firstly, the welding flux is not sent out firstly, a cleaning program before welding is started on the operation panel 5 of the welding vehicle, the control system controls the starting laser head 301 to start working and controls the swinging motor to work, so that the laser head 301 turns backwards to the welding wire and swings back and forth (the motor is preferably the swinging motor in the embodiment), the projection point of the welding wire on the steel plate 6 is cleaned to the groove 7 in the vertical projection range of the laser (as shown in figure 2), the laser head 301 automatically returns after cleaning, the laser is closed, the welding program is started on the operation panel 5, the control system controls the restarting laser head 301 to start cleaning the groove 7, the control system controls the welding wire to be sent out to be in, and controlling arc striking, starting welding, and controlling the welding trolley to start to walk by the arc striking simultaneous control system.

To sum up, the embodiment of the invention provides a laser cleaning welding trolley, which realizes non-contact groove cleaning, has good cleaning effect and good welding quality, reduces mechanical polishing processes, integrates the polishing processes in the welding process, realizes welding of the groove 7 after cleaning, and avoids the problem of secondary pollution and re-polishing of the groove 7. When pre-cleaning before welding, the laser head 301 can swing, the laser focal length can be adjusted, and the pre-cleaning effect is ensured. During welding, the laser light spots can rotate, the cleaning times of the groove and the area in the range of 20mm on two sides can be guaranteed by setting the length of the light spots and the rotation period according to the welding speed and the width of the groove, and the cleaning effect is guaranteed.

Example 2: a control method for cleaning a welding tractor by laser.

The embodiment provides a control method for cleaning a welding trolley based on laser, which is characterized by comprising the following steps:

s1, adjusting the welding component 2 and the laser component 3 to be aligned to the positions to be welded, wherein the welding wire corresponds to the groove center line 702;

s2, controlling the system to start a pre-cleaning program, starting the laser assembly 3 to emit laser, and controlling the laser assembly 3 to swing back and forth towards the welding assembly 2 to clean;

and S3, after the pre-cleaning is finished, the laser is turned off, the laser component 3 is reset, the welding component 2 is started to start welding, the laser component 3 is restarted to emit laser to clean in the welding process, and the vehicle body 1 starts to walk.

Preferably, in step S3, when the laser assembly 3 restarts to emit laser light for cleaning, the system controls the optical lens set in the laser head 301 to rotate 360 degrees. When the laser rotates, the range of covering the groove 7 by 20mm needs to be ensured, so that the rotation period of the optical lens group in the laser head 301 when the optical lens group rotates needs to meet the following conditions:

Preferably, when the laser assembly 3 performs the pre-cleaning in step S1 and the laser scans the surface of the cleaning area, the focal length of the emitted laser is adjusted between the minimum focal length and the maximum focal length in real time, and the focal length values of the minimum focal length and the maximum focal length are both within 150 mm-200 mm.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a clean welding carriage of laser which characterized in that, includes the automobile body, be provided with the crossbeam on the automobile body, install welding subassembly and laser subassembly on the crossbeam, still install control panel on the crossbeam, control system is installed to the control panel in, welding subassembly with laser subassembly all with the control system electricity is connected, laser subassembly rotates to be installed on the crossbeam, laser subassembly rotates before the welding and carries out laser precleaning to needing the welding area.

2. The laser cleaning welding carriage of claim 1, wherein the laser assembly includes a laser head having a rotatable set of optical lenses disposed therein.

3. The laser cleaning welding carriage as described in claim 1, wherein the laser assembly is rotationally pre-cleaned with a minimum laser beam angle of between 50 ° and 60 ° from horizontal.

4. The laser cleaning welding tractor as claimed in claim 1, wherein a drive assembly is further provided on the cross beam, the drive assembly being connected to the laser assembly and controlling the rotation of the laser assembly.

5. The laser cleaning welding carriage as recited in claim 1, wherein the welding assembly includes a funnel, a wire feeder, and a flux shield, the wire feeder being mounted below the beam, the flux shield being coupled to and disposed below the wire feeder, the funnel being disposed on a side of the wire feeder.

6. The laser cleaning welding carriage as claimed in claim 1, wherein a support is provided between said carriage body and said cross member, said cross member is slidably mounted on an upper end of said support, and said carriage body is fixedly mounted on a bottom of said support.

7. The laser cleaning welding carriage as recited in claim 2, wherein an automatic zoom system is provided in said laser head.

8. A method for controlling a laser-cleaned welding carriage according to any one of claims 1 to 7, characterized in that it comprises the following steps:

9. The method as claimed in claim 8, wherein the laser assembly includes a laser head and a motor, the laser head is connected to a power output end of the motor, the motor is slidably mounted on the cross beam, a rotatable optical lens set is disposed in the laser head, and in step S3, when the laser assembly is restarted to emit laser for cleaning, the system controls the optical lens set in the laser head to rotate 360 degrees.

10. The control method of a laser cleaning welding carriage as claimed in claim 9, wherein an automatic zoom system is provided in said laser head, and when the laser assembly is pre-cleaned in said step S1 and the laser is swept over the surface of the cleaning area, the focal length of the emitted laser is adjusted in real time between a minimum focal length and a maximum focal length, and the focal length of said minimum focal length and said maximum focal length are both within a range of 150mm to 200 mm.

11. The method of claim 9, wherein the period T of rotation of the optics group is in accordance with the following relationship: