Adjustable protective gas injection device for laser welding and adjusting method of adjustable protective gas injection device

Abstract

The invention discloses an adjustable protective gas blowing device for laser welding, which comprises a spraying beam, a nozzle arranged at one end of the spraying beam, a protective gas pipeline arranged on the spraying beam and communicated with the nozzle, a ruby laser generator, a fixed bracket and a position adjusting mechanism, the ruby laser generator is arranged at the tail end of the nozzle and can emit ruby laser beams from the axis of the nozzle, transverse sliding grooves are formed in the multiple fixing supports, the spraying beam is arranged in the transverse sliding grooves in a penetrating mode, and the position adjusting mechanism is located at one fixing support. Comprising a transverse rack fixedly arranged on the spraying beam, a driving motor fixedly arranged on the fixing support and a gear connected to an output shaft of the driving motor and meshed with the transverse rack. The invention further discloses an adjusting method of the injection device. Visibility of blowing airflow is achieved, and therefore the blowing position of the nozzle is accurately adjusted.

Description

Technical Field

[0001] The invention relates to laser welding supporting equipment, in particular to an adjustable protective gas blowing device for laser welding and an adjustment method thereof. Background Art

[0002] High-speed pickling cold rolling mill laser welder is mainly used for welding hot-rolled strip steel with a thickness of 2mm-6mm and a hardness of HR30Te of 42-95. The output spot diameter of the output mirror of the laser source body of the welder is 18-22mm, and the power of the laser beam is 8KW-12KW. The laser has good deep melting performance. However, when welding and melting steel, a large amount of plasma cloud will be generated, which will make it unable to effectively melt the subsequent strip steel and produce pores and cold welds. Therefore, it is necessary to use a shielding gas to blow away the plasma cloud. The equipment for blowing away the laser welding plasma cloud is a shielding gas blowing device. This type of blowing device is installed on the base of the welding machine guide wheel. The fixing hole of the base is a waist-shaped hole, which is fixed with bolts. The position of the hole nozzle can be roughly adjusted according to the approximate position of the laser before the bolts are fixed. Since the nozzle shielding gas ejection direction is invisible (shielding gas is colorless), the adjustment accuracy is relatively low. Welding pores are easily generated during welding, affecting the welding quality. After the pores are generated, the nozzle position must be adjusted, but the existing adjustment method is only rough adjustment, with poor accuracy and low efficiency, which seriously affects the welding quality of the welding machine and the normal production of the unit.

[0003] At present, patents with application numbers such as 201220432806.4, 201410753131.7, and 200620001012.7 are mostly improvements to the blowing equipment itself, and do not involve effective adjustment of the blowing position of its nozzle. Summary of the invention

[0004] In order to solve the above problems of the prior art, the present invention provides an adjustable shielding gas blowing device for laser welding and an adjustment method thereof, which realizes the visibility of the blowing airflow, thereby realizing precise adjustment of the nozzle blowing position.

[0005] On the one hand, an adjustable shielding gas blowing device for laser welding includes a spray beam, a nozzle arranged at one end of the spray beam, a shielding gas pipeline arranged on the spray beam and connected to the nozzle, and also includes a ruby ​​laser generator, a fixed bracket, and a position adjustment mechanism. The ruby ​​laser generator is arranged at the end of the nozzle and can emit a ruby ​​laser beam from the axis of the nozzle. Several fixed brackets are provided with transverse slide grooves, and the spray beam is inserted in the transverse slide grooves. The position adjustment mechanism is located at one of the fixed brackets, including a transverse rack fixed on the spray beam, a drive motor fixed on the fixed bracket, and a gear connected to the output shaft of the drive motor and meshing with the transverse rack.

[0006] The protective gas pipeline is also provided with a flow and pressure detection component.

[0007] The nozzle has two inner and outer nozzles. The outer nozzle is thread-fixed, with a circular hole structure inside and a hexagonal structure outside. The inner nozzle is a trumpet-shaped structure that can move axially inside the outer nozzle and is smaller in the front and larger in the back.

[0008] On the other hand, a method for adjusting an adjustable shielding gas blowing device for laser welding comprises the following steps:

[0009] A. The ruby ​​laser beam is emitted from the nozzle by the ruby ​​laser generator;

[0010] B. Use the weld seam shooting sensor to shoot the welded weld seam and ruby ​​laser beam;

[0011] C. Determine the deviation between the ruby ​​laser beam and the laser focus position of the laser welder through a computer;

[0012] D. If the deviation is greater than the set value, an alarm is issued and the drive motor is started to move the spray beam in the horizontal slide through the gear and horizontal rack, and the ruby ​​laser beam is adjusted to the laser focus position of the laser welder.

[0013] The method also includes step E. When two alarms occur within a production cycle to remind that there is a deviation in the nozzle position, the operation and maintenance personnel are required to conduct on-site confirmation of the nozzle position and the laser focus position of the laser welder.

[0014] It also includes step F. The actual output flow of the protective gas is detected in real time through the flow and pressure detection component. When the measured flow is lower than the set range, the pressure is adjusted accordingly to stabilize the gas flow; when the measured pressure increases by more than 30%, an alarm is issued to prompt the maintenance personnel to check the protective gas circuit and the nozzle status.

[0015] The method also includes step G. selecting an inner or outer nozzle according to the material of the steel plate to be laser welded.

[0016] The adjustable laser welding shielding gas blowing device and the adjustment method thereof of the present invention have the following advantages:

[0017] 1. Through the ruby ​​laser generator, the visibility of the jet airflow is achieved, and the actual position of the shielding gas jet weld can be accurately indicated. The weld seam shooting sensor of the laser welder is used to shoot it and the laser focus position and transmit it to the computer to judge the deviation;

[0018] 2. If the deviation exceeds the range, the spray beam can be driven by the drive motor to make corresponding lateral adjustments;

[0019] 3. The flow and pressure detection components are used to detect whether the shielding gas is flowing smoothly, so that the shielding gas pipeline is blocked or the nozzle is damaged by welding slag splashes.

[0020] 4. The nozzle has a two-layer structure with adjustable hole diameter. It can be adjusted according to the requirements of different welding materials to improve the effectiveness of the spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the working state of the adjustable protective gas blowing device for laser welding of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the protective gas blowing device of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the inner layer nozzle of the present invention in a retracted state;

[0024] Figure 4 It is a structural schematic diagram of the inner layer nozzle of the present invention in an extended state. DETAILED DESCRIPTION

[0025] The following is a further description of an adjustable laser welding shielding gas blowing device and an adjustment method thereof of the present invention. Figure 1-2 As shown, the spraying device is the same as the prior art in that it also includes a spray beam 1, a nozzle 2 arranged at one end of the spray beam 1, and a protective gas pipeline 3 arranged on the spray beam 1 and connected to the nozzle 2. The difference is that it also includes a ruby ​​laser generator 4, a fixed bracket 5, and a position adjustment mechanism. The ruby ​​laser generator 4 is arranged at the end of the nozzle 2 and can emit a ruby ​​laser beam 6 from the axis of the nozzle 2 to the weld 8 with the welded strip 7 to simulate the protective gas spraying position. Several fixed brackets 5 are provided with transverse slide grooves 9, which are arranged side by side, usually as shown in FIG. Figure 1 A pair can be used, of course, it can also be more than two. The spray beam 1 is inserted into the transverse slide groove 9, and the position adjustment mechanism is located at one of the fixed brackets 5, including a transverse rack 10 fixedly mounted on the spray beam 1, a drive motor 11 fixedly mounted on the fixed bracket 5, and a gear 12 connected to the output shaft of the drive motor 11 and meshing with the transverse rack 10. The drive motor 11 can be a servo motor, which can drive the gear 12 to rotate by forward and reverse rotation, so that the rack drives the spray beam 1 to move left and right in the transverse slide groove 9, thereby realizing the adjustment of the spraying angle, that is, the position where the ruby ​​laser beam 6 is shot on the weld 8 is located at the center of the weld.

[0026] In addition, a flow and pressure detection component 13 is provided on the protective gas pipeline 3 to detect and control the gas flow and pressure of the pipeline in real time.

[0027] like Figure 3-4As shown, in addition, the nozzle 2 has two inner and outer nozzles, the outer nozzle 21 is threaded fixed, the inner part is a circular hole structure, and the outer part is a hexagonal structure 23; the inner nozzle 22 is a trumpet-shaped structure that can move axially inside the outer nozzle and is small in the front and large in the back. According to the requirements of different welding materials, the inner nozzle 22 can be moved axially forward and backward to achieve the adjustment of the size of the nozzle 2 and the conversion of the inner and outer nozzles 21 and 22, so as to improve the effectiveness of the spraying.

[0028] The working principle of the gas injection device is as follows:

[0029] First, a ruby ​​laser beam 6 is emitted from a ruby ​​laser generator 4 and projected from a nozzle 2 onto a weld 8 between steel strips 7;

[0030] Then, the weld seam and the ruby ​​laser beam 6 are photographed using a weld seam photographing sensor (not shown in the figure) provided with the existing laser welder;

[0031] Then, the computer 16 determines the deviation between the ruby ​​laser beam 6 and the laser focus position (i.e., the center of the weld) of the laser processing head 14 of the laser welding machine according to the input captured image ( Figure 1 17 represents the laser reflector of the flux, and 18 represents the laser beam of the welding machine, which is reflected by the laser reflector and emitted from the laser processing head). There are many ways to make such judgments, such as using the screen ruler tool of Google, which can accurately calculate the actual deviation value;

[0032] Finally, if the actual deviation value is greater than the set value (such as + / -0.3mm), an alarm is issued. After confirmation by the operator, the drive motor 11 is started to move the spray beam 1 in the transverse slide 9 through the gear 12 and the transverse rack 10, and the ruby ​​laser beam 6 is adjusted to the laser focus position of the laser welder. Of course, the drive motor 11 can be equipped with an encoder 15 to achieve precise adjustment according to the deviation value.

[0033] Furthermore, when two alarms occur in one production cycle to indicate that the nozzle 2 position is deviated, the operator and maintenance personnel are required to confirm the nozzle 2 position and the laser focus position of the laser welder on site. Since the deviation of the laser focus position will also cause the nozzle 2 position alarm function, it can also monitor whether the laser focus position of the laser welder is deviated.

[0034] In addition, the actual output flow of the shielding gas can be detected in real time through the flow and pressure detection component 13. When the measured flow is lower than the set range, the pressure is adjusted accordingly to stabilize the gas flow; when the measured pressure increases by more than 30%, an alarm is issued to prompt maintenance personnel to check the shielding gas circuit and the status of the nozzle 2 (whether it is blocked), so that the abnormality of the welding system can be handled before it develops into a fault.

[0035] In summary, the use of the adjustable shielding gas blowing device for laser welding and the adjustment method thereof of the present invention can effectively ensure the accuracy and maintenance of the shielding gas nozzle 2 blowing, and ultimately improve the reliability of the welding seam quality of the welding machine and the effectiveness of the unit operation.

[0036] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An adjustable shielding gas blowing device for laser welding, comprising a spray beam, a nozzle arranged at one end of the spray beam, and a shielding gas pipeline arranged on the spray beam and connected to the nozzle, Features : It also includes a ruby ​​laser generator, a fixed bracket, and a position adjustment mechanism. The ruby ​​laser generator is arranged at the end of the nozzle and can emit a ruby ​​laser beam from the axis of the nozzle. Several fixed brackets are provided with transverse slide grooves, and the spray beam is penetrated in the transverse slide grooves. The position adjustment mechanism is located at one of the fixed brackets, including a transverse rack fixed on the spray beam, a driving motor fixed on the fixed bracket, and a gear connected to the output shaft of the driving motor and meshing with the transverse rack.

2. An adjustable shielding gas blowing device for laser welding as claimed in claim 1, Features: The protective gas pipeline is also provided with a flow and pressure detection component.

3. An adjustable shielding gas blowing device for laser welding as claimed in claim 1, Features: The nozzle has two inner and outer nozzles. The outer nozzle is thread-fixed, with a circular hole structure inside and a hexagonal structure outside. The inner nozzle is a trumpet-shaped structure that can move axially inside the outer nozzle and is smaller in the front and larger in the back.

4. The method for adjusting the adjustable shielding gas blowing device for laser welding according to claim 1, Features: The following steps are involved: A. The ruby ​​laser beam is emitted from the nozzle by the ruby ​​laser generator; B. Use the weld seam shooting sensor to shoot the welded weld seam and ruby ​​laser beam; C. Determine the deviation between the ruby ​​laser beam and the laser focus position of the laser welder through a computer; D. If the deviation is greater than the set value, an alarm is issued and the drive motor is started to move the spray beam in the horizontal slide through the gear and horizontal rack, and the ruby ​​laser beam is adjusted to the laser focus position of the laser welder.

5. The method for adjusting the adjustable shielding gas blowing device for laser welding as claimed in claim 4, Features: The method also includes step E. When two alarms occur within a production cycle to remind that there is a deviation in the nozzle position, the operation and maintenance personnel are required to conduct on-site confirmation of the nozzle position and the laser focus position of the laser welder.

6. The method for adjusting the adjustable shielding gas blowing device for laser welding as claimed in claim 4, Features: It also includes step F. The actual output flow of the protective gas is detected in real time through the flow and pressure detection component. When the measured flow is lower than the set range, the pressure is adjusted accordingly to stabilize the gas flow; when the measured pressure increases by more than 30%, an alarm is issued to prompt the maintenance personnel to check the protective gas circuit and the nozzle status.

7. The method for adjusting the adjustable shielding gas blowing device for laser welding as claimed in claim 4, Features: The method also includes step G. selecting an inner or outer nozzle according to the material of the steel plate to be laser welded.

Images