Laser welding device and method for automotive plastic joint and plastic corrugated pipe

Abstract

The laser welding device and method for automotive plastic joints and plastic bellows of the present invention belong to the field of laser welding technology. In the laser welding device for automotive plastic joints and plastic bellows, the semiconductor laser is located below the workbench, a slide rail is provided on the workbench, a driving mechanism is installed on the slide rail, a two-dimensional scanning galvanometer is arranged directly above the driving mechanism, a protective window is installed at the light outlet of the two-dimensional scanning galvanometer, an infrared temperature sensor is installed on the protective window, and there are two clamping tooling assemblies, which are respectively arranged at the left front and right front of the slide rail. The plastic joint and the plastic bellows to be welded are fixed by a laser welding device until the welding area to be welded is tightened and welded 360°. The present invention can complete welding without accurately finding the peak position to be welded, reducing the possibility of leaking and false welding. At the same time, the use of double-holding tooling assemblies improves production efficiency and equipment utilization, and also reduces costs.

Description

Technical Field

[0001] The invention discloses a laser welding device and method for a vehicle plastic joint and a plastic corrugated pipe, and belongs to the technical field of laser welding. Background Art

[0002] Nylon bellows are increasingly used in vehicle heat pipe systems. Quick-connect connectors need to be connected with bamboo sections and straight sections of bellows through interference fit, so the straight sections need to be retained at the ends of the tubes. When there are many types of products, it is necessary to develop a variety of extrusion dies, which have problems such as long development cycle, low production efficiency, high inventory risk, and poor flexibility. The structure in which the plastic joint and the corrugated area are directly connected has good product versatility and strong platform performance. However, due to the low axial strength of the bellows and the poor dimensional stability of the corrugations, the joint and the pipe body cannot meet the performance requirements using the existing cold pressing connection method. Therefore, a laser welding solution is used to weld the outer wall of the plastic bellows and the inner wall of the plastic joint. The existing Chinese invention patent application "A connection structure of a plastic bellows and a plastic joint" (application number: 201910859127.1) discloses a welding scheme, in which the plastic bellows and the plastic joint are connected by interference fit, and the two are clamped and fixed by a fixing clamp. The plastic bellows and the plastic joint are sealed and fixed by laser welding. The laser in the short-wave infrared zone is directed to the wave crest position to be bonded to perform 360° seamless welding. The number of wave crests welded can be one or more. After welding one wave crest, the laser head can adjust the position to weld the next wave crest position until all corrugated welding work is completed. However, in the actual welding process, this welding scheme still has certain defects, such as:

[0003] 1. When the plastic bellows is inserted into the plastic joint, the outer surface of the plastic bellows is a cycle of crests and troughs, and the bellows will move in the axial direction after assembly. The crest spacing may be inconsistent each time. Therefore, during laser welding, the welding area is a discontinuous area. Through welding in circles, it is impossible to accurately find the crest position to be welded, which is prone to leaking and cold welding;

[0004] 2. After welding one wave crest, you need to readjust the position of the laser head to weld the next wave crest.

[0005] The existing Chinese utility model patent "A laser welding device for tubular structures" (application number: 201721781662.2) includes a device body and a control system, a tubular structure clamping device arranged in the device body, a laser light emitter and an optical path conversion device; during laser welding, the axial direction of the tubular structure is parallel to the laser beam emitted by the laser light emitter, and the axis of the tubular structure coincides with the axis of the optical path conversion device. After being converted by the optical path conversion device, the laser beam is reflected to the plug-in part and is perpendicular to the axis of the tubular structure. The laser beam penetrates the first plastic pipe and welds the outer surface of the second plastic pipe in a circular manner. However, the device still has some defects during the welding process, such as:

[0006] During welding, the laser emitter and the optical path conversion device need to be rotated to achieve circumferential welding of the plug-in parts of the first plastic tube and the second plastic tube, and then the laser emitter and the optical path conversion device are rotated, but the rotation requires a larger working space. Summary of the invention

[0007] In order to solve the problems existing in the prior art, such as the inability to accurately find the wave peak position to be welded, easy welding leakage and cold welding, and the need to adjust the laser and rotate the laser during the welding process, which makes the laser light unstable and the working space larger, we proposed a technical solution called laser welding device and method for automotive plastic joints and plastic bellows.

[0008] The laser welding device for automobile plastic joint and plastic corrugated pipe of the present invention is characterized by: Figure 1 and 2 As shown, the semiconductor laser 2 is located below the workbench 1, a slide rail 3 is provided on the workbench 1, a driving mechanism 4 is installed on the slide rail 3, a two-dimensional scanning galvanometer 5 is arranged directly above the driving mechanism 4, a protective window 6 is installed at the light outlet of the two-dimensional scanning galvanometer 5, an infrared temperature sensor is installed at the position of the protective window 6, and there are two clamping tooling assemblies 8, which are respectively arranged at the left front and right front of the slide rail 3;

[0009] A weighing pulley is installed on the bottom foot of the workbench 1;

[0010] The QBH head is located behind the two-dimensional scanning galvanometer 5, and the semiconductor laser 2 is connected to the QBH head by an optical fiber 201. Figure 2 As shown;

[0011] like Figure 2 and Figure 3As shown, in the clamping fixture assembly 8, the first reducer 801 and the joint fixing assembly 9 are fastened together by bolts. The joint fixing base 901 is arranged at the bottom end of the joint fixing assembly 9, the plastic joint 12 is placed on the joint fixing base 901, and a joint fixing upper cover 902 is arranged directly above the plastic joint 12. The latch 903 is inserted from the top of the joint fixing assembly 9 and the bottom end is stuck in the groove above the joint fixing upper cover 902, so as to fasten the plastic joint 12 inside the joint fixing base 901 and the joint fixing upper cover 902;

[0012] In the clamping fixture assembly 8, the T-shaped pipeline fixing assembly 10 and the second reducer 802 are fastened together by bolts, and a sliding groove is provided on the T-shaped pipeline fixing assembly 10. The left sliding arm 1002 is provided on the left side of the pipeline fixing assembly 10 and can slide left and right on the T-shaped pipeline fixing assembly 10; the right sliding arm 1004 is provided on the right side of the T-shaped pipeline fixing assembly 10 and can slide left and right on the T-shaped pipeline fixing assembly 10;

[0013] like Figure 3 As shown, the lower clamping block 1005 is fixed to the T-shaped pipe fixing assembly 10 by bolts and is located in the middle of the left sliding arm 1002 and the right sliding arm 1004, wherein a U-shaped groove is provided in the middle of the lower clamping block 1005; the inverted L-shaped left clamping block 1001 has an arc groove, which is located directly behind the left sliding arm 1002, and one end with the arc groove is placed on the lower clamping block 1005; the inverted L-shaped right clamping block 1003 has an arc groove, which is located directly behind the right sliding arm 1004, and one end with the arc groove is placed on the lower clamping block 1005;

[0014] An upper and lower sliding block 1008 is provided below the T-shaped pipeline fixing assembly 10, and four T-shaped connecting columns 1006 are provided through the upper and lower sliding blocks 1008, and the top ends of the T-shaped connecting columns 1006 are rigidly connected to the left sliding arm 1002 and the right sliding arm 1004 respectively; a spring 1007 is sleeved on the outer side of each T-shaped connecting column 1006, and the upper and lower ends of the spring 1007 are respectively fixed on the left sliding arm 1002, the right sliding arm 1004 and the upper and lower sliding blocks 1008; two oblique tie bars 1009 are connected to the middle position of the upper and lower sliding blocks 1008, and the other ends of the oblique tie bars 1009 are respectively connected to the left sliding arm 1002 and the right sliding arm 1004;

[0015] A hydraulic cylinder 16 is provided below the upper and lower sliding blocks 1008 .

[0016] The laser welding method for a plastic joint and a plastic corrugated pipe for a vehicle of the present invention is characterized by comprising the following steps:

[0017] S1. Install the plastic joint 12 and the plastic corrugated pipe 11 to be welded in the clamping tool assembly 8, as shown in FIG. Figure 3 As shown;

[0018] The plastic joint 12 is made of a laser-transmissive material, such as PA, PC or other engineering plastics; the plastic corrugated tube 11 is made of a laser-impermeable material, such as PA, PC or other engineering plastics.

[0019] S2, welding is performed on the welding area 17, where the welding area 17 covers 3 to 5 plastic corrugated pipe crests 14, such as Figure 4 , Figure 5 As shown, the plastic joint and the plastic bellows rotate synchronously with the first reducer 801 and the second reducer 802, and the welding process parameters include: the laser emitted by the semiconductor laser 2 is in the short-wave infrared region, the welding laser wavelength is a wavelength within the range of 800nm ​​to 1064nm, the welding laser power is within the range of 100W to 200W, and the plastic joint and the plastic bellows rotate synchronously at a speed of 10-200 degrees / second;

[0020] The swing speed and swing angle of the X and Y galvanometer scanning heads in the two-dimensional scanning galvanometer 5 are controlled by PLC software, so that the welding spot moves at a speed of 50mm / s to 8000mm / s in the welding area 17, forming a rectangular spot 13 of (1mm to 80mm)*(1mm to 80mm).

[0021] S3. The infrared temperature sensor monitors the temperature change in the welding area 17 in real time until the welding of the plastic joint and the plastic corrugated pipe is completed.

[0022] Real-time monitoring is performed by comparing the temperature of the welding area 17 fed back by the infrared temperature sensor with the standard value to adjust the parameters of the welding laser power.

[0023] The present invention has achieved the expected technical effects: 1. The present invention adopts the design scheme of double clamping tooling assembly 8, such as Figure 1 As shown, the two-dimensional scanning galvanometer 5 can reciprocate along the slide rail on the left and right clamping fixture assemblies 8 for welding. When welding at one station, the other station can install the product. The two stations can produce different products by changing the fixing mechanism, which improves the production efficiency and equipment utilization rate and reduces the cost. The semiconductor laser 2 uses a short-wavelength laser in the infrared region, such as Figure 2 As shown, by selecting a suitable wavelength, the laser energy is absorbed and converted into heat energy, so that the plastic bellows 11 and the plastic joint 12 are melted and welded together. The short-wave infrared laser will not cause the plastic bellows 11 and the plastic joint 12 to melt excessively, thereby ensuring the welding quality and sealing of the welding and improving the welding efficiency. Since the outer surface of the plastic bellows 11 is a cycle of crests 14 and troughs 15, as shown in FIG. Figure 4 and 5As shown, only the outer surface of the wave crest 14 and the inner surface of the shell of the plastic joint 12 are welded. By adjusting the swing speed and swing angle of the X-axis and Y-axis in the two-dimensional scanning galvanometer 5, the laser beam 7 emitted by the semiconductor laser 2 is controlled to move quickly to form a rectangular spot 13. During welding, the length of the rectangular spot 13 can cover multiple wave crests 14 that need to be welded. It is no longer necessary to match the laser beam 7 with the wave crest 14 to complete the welding work, thereby avoiding the situation of missed welding and cold welding, thereby improving the quality of welding; the first reducer 801 and the second reducer 802 simultaneously rotate around the Y-axis, such as Figures 1 to 3 As shown, in order to ensure the coaxiality of the joint fixing base 901 and the plastic joint 12 with the first reducer 801, a pin 903 is set to limit the transmission of the joint fixing base 901 and the plastic joint 12 along the Y-axis direction, thereby ensuring the consistency of the welding position. Through reasonable settings, the semiconductor laser 2 is controlled to emit a rectangular spot 13 within the time of 720° rotation of the first reducer 801 and the second reducer 802, and the 360° welding of the welding area 17 is accurately completed, which will not cause the loss of the welding area 17, nor will it cause overburning of a certain position on the welding area 17, thereby ensuring the sealing and consistency of the welding and improving the work efficiency. In addition, in order to ensure the stability of the welding process, an infrared temperature sensor is installed on the protective window 6, which can monitor the temperature changes at the welding position at any time, and feedback to the laser to adjust the light output power, so that the temperature always fluctuates around the standard value.

[0024] 2. The technical effects achieved by the present invention can be verified by the sealing test and the bursting test of the plastic bellows 11 and the plastic joint 12 after welding and plugging. The test items are as follows:

[0025] (1) Sealing test: The two ends of the welded plastic bellows 11 and plastic joint 12 were sealed and then placed in liquids at -40°C, 23°C, and 120°C, respectively. A pressure of 0.5 MPa was then passed into the sealed plastic bellows 11 and plastic joint 12 for 1 hour. No bubbles were generated and no air leakage occurred.

[0026] (2) Burst strength test: The welded plastic bellows 11 and plastic joint 12 are installed on the burst test machine, and pressure is gradually applied inward from one end until the welded plastic bellows 11 and plastic joint 12 burst, causing air leakage. It is found that the pressure applied inward can reach more than 3MPa, and the bursting part of the sample is not on the welding area, and there is no open welding phenomenon in the welding area.

[0027] Through the sealing test and bursting strength test, it can be found that the opaque plastic bellows and plastic joints after rectangular spot welding and plugging completely solve the low permeability of the medium caused by ambient temperature changes, use time and vibration. The strength of the welding area is greater than that of the plastic bellows and plastic joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the laser welding device for a vehicle plastic joint and a plastic corrugated pipe of the present invention, with the viewing angle being the upper right front. The figure also serves as an abstract illustration.

[0029] Figure 2 It is a three-dimensional schematic diagram of the overall structure of the laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle of the present invention, with the viewing angle being from the upper right rear.

[0030] Figure 3 It is a three-dimensional schematic diagram of the internal structure of the clamping tool assembly in the laser welding device for automobile plastic joints and plastic bellows of the present invention, and the figure also shows the clamping relationship between the clamping tool assembly and the workpiece to be welded.

[0031] Figure 4 It is a schematic diagram of the welding area of ​​the laser welding method for a vehicle plastic joint and a plastic corrugated pipe according to the present invention.

[0032] Figure 5 The figure is a schematic diagram of the position and shape of a rectangular light spot in the laser welding method of the automotive plastic joint and the plastic corrugated pipe of the present invention. DETAILED DESCRIPTION

[0033] The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle of the present invention is as follows: Figure 1 and Figure 2 As shown, the semiconductor laser 2 is located below the workbench 1, and a weighing pulley is installed on the bottom foot of the workbench 1 to facilitate the movement of the workbench 1; a slide rail 3 is provided on the workbench 1, and a driving mechanism 4 is installed on the slide rail 3, and the driving mechanism 4 can move unimpeded on the slide rail 3, and a two-dimensional scanning galvanometer 5 is arranged directly above the driving mechanism 4, and a protective window 6 is installed at the light outlet of the two-dimensional scanning galvanometer 5, and an infrared temperature sensor is installed at the position of the protective window 6, and there are two clamping tooling assemblies 8, which are respectively arranged at the left front and right front of the slide rail 3.

[0034] The two-dimensional scanning galvanometer 5 is provided with two galvanometer scanning heads, X and Y, which are driven by a high-speed servo motor. The swing speed and swing angle of the two galvanometer scanning heads, X and Y, are adjusted according to the size of the welding area 17 required.

[0035] like Figure 2As shown, the QBH head is located behind the two-dimensional scanning galvanometer 5, and the semiconductor laser 2 and the QBH head are connected by an optical fiber 201; the circular laser beam 701 emitted by the semiconductor laser 2 is transmitted through the optical fiber 201, and the circular laser beam 701 is transmitted from the optical fiber 201 through the QBH head into the two-dimensional scanning galvanometer 5; the circular laser beam 701 is refracted inside the two-dimensional scanning galvanometer 5, and is emitted from the protective window 6 through the light outlet to form a rectangular light spot 13.

[0036] like Figure 2 and Figure 3 As shown, in the clamping fixture assembly 8, the first reducer 801 and the joint fixing assembly 9 are fastened together by bolts. The joint fixing base 901 is arranged at the bottom end of the joint fixing assembly 9, the plastic joint 12 is placed on the joint fixing base 901, and a joint fixing upper cover 902 is arranged directly above the plastic joint 12. The latch 903 is inserted from the top of the joint fixing assembly 9 and the bottom end is stuck in the groove above the joint fixing upper cover 902, so as to fasten the plastic joint 12 inside the joint fixing base 901 and the joint fixing upper cover 902. The joint fixing base 901, the plastic joint 12 and the joint fixing upper cover 902 are fixed by profiling, which provides sufficient torque for rotation and ensures the coaxiality with the first reducer 801.

[0037] In the clamping fixture assembly 8, the T-shaped pipeline fixing assembly 10 is fastened together with the second reducer 802 by bolts, and moves coaxially and at the same speed as the second reducer 802 to ensure coaxiality, and a sliding groove is provided on the T-shaped pipeline fixing assembly 10. The left sliding arm 1002 is provided on the left side of the pipeline fixing assembly 10, and can slide left and right on the T-shaped pipeline fixing assembly 10; the right sliding arm 1004 is provided on the right side of the T-shaped pipeline fixing assembly 10, and can slide left and right on the T-shaped pipeline fixing assembly 10.

[0038] like Figure 3 As shown, a U-shaped groove is provided in the middle of the lower clamping block 1005, which is fixed to the T-shaped pipe fixing assembly 10 by bolts and is located in the middle of the left sliding arm 1002 and the right sliding arm 1004; an arc-shaped groove is provided on the inverted L-shaped left clamping block 1001, which is located in front of the left sliding arm 1002, and one end with the arc-shaped groove is placed on the lower clamping block 1005, and the inverted L-shaped left clamping block 1001 and the left sliding arm 1002 move synchronously; an arc-shaped groove is provided on the inverted L-shaped right clamping block 1003, which is located in front of the right sliding arm 1004, and one end with the arc-shaped groove is placed on the lower clamping block 1005, and the inverted L-shaped right clamping block 1003 and the right sliding arm 1004 move synchronously. The U-shaped groove on the lower clamping block 1005 cooperates with the arc-shaped grooves on the inverted L-shaped left clamping block 1001 and the inverted L-shaped right clamping block 1003 to fix the plastic corrugated pipe 11.

[0039] An upper and lower sliding block 1008 is provided at the bottom of the T-shaped pipeline fixing component 10, which is fixed by an anchor bolt; four T-shaped connecting columns 1006 are provided through the upper and lower sliding blocks 1008, and the top ends of the T-shaped connecting columns 1006 are rigidly connected to the left sliding arm 1002 and the right sliding arm 1004 respectively; a spring 1007 is sleeved on the outside of each T-shaped connecting column 1006, and the upper and lower ends of the spring 1007 are respectively fixed on the left sliding arm 1002, the right sliding arm 1004 and the upper and lower sliding blocks 1008; two oblique tie rods 1009 are connected to the middle position of the upper and lower sliding blocks 1008, and the other ends of the oblique tie rods 1009 are respectively connected to the left sliding arm 1002 and the right sliding arm 1004, and the oblique tie rods 1009 can drive the left sliding arm 1002 and the right sliding arm 1004 to separate and clamp.

[0040] A hydraulic cylinder 16 is provided below the upper and lower sliding blocks 1008. The extension and retraction of the hydraulic cylinder 16 can control the rise and fall of the upper and lower sliding blocks 1008. When the upper and lower sliding blocks 1008 rise, the spring 1007 contracts, and at the same time, the oblique tension rod 1009 drives the left sliding arm 1002 and the right sliding arm 1004 to separate to both sides; when the upper and lower sliding blocks 1008 descend, the spring 1007 rebounds, and at the same time, the oblique tension rod 1009 drives the left sliding arm 1002 and the right sliding arm 1004 to clamp inward.

[0041] The laser welding method of the vehicle plastic joint and the plastic corrugated pipe of the present invention comprises the following steps:

[0042] S1. Install the plastic joint 12 and the plastic corrugated pipe 11 to be welded in the clamping tool assembly 8, as shown in FIG. Figure 3 As shown. The plastic joint 12 to be welded is placed on the joint fixing base 901, and then the joint fixing cover 902 is placed on the plastic joint 12, and the latch 903 is inserted from the top of the joint fixing assembly 9 and the bottom end is stuck in the groove above the joint fixing cover 902; the hydraulic cylinder 16 is driven to extend upward, and the upper and lower sliding blocks 1008 rise, driving the spring 1007 to contract, and at the same time the inclined tie rod 1009 drives the left sliding arm 1002 and the right sliding arm 1004 to separate to both sides, and then the left sliding arm 1002 and the right sliding arm 1004 are connected. Then, the plastic bellows 11 is passed through the second reducer 802 and placed on the lower clamping block 1005, and is inserted into the plastic joint 12 under pressure. The hydraulic cylinder 16 is then driven to contract, and the spring 1007 rebounds. At the same time, the inclined tie rod 1009 drives the left sliding arm 1002 and the right sliding arm 1004 to clamp inward, and the plastic bellows 12 is clamped and fixed by the cooperation of the hydraulic cylinder 16, the inverted L-shaped left clamping block 1001, the inverted L-shaped right clamping block 1003 and the lower clamping block 105.

[0043] The plastic joint 12 is a laser-transmissive material, such as PA, PC and other engineering plastics; the plastic bellows 11 is a laser-impermeable material, such as PA, PC and other engineering plastics.

[0044] S2, welding is performed on the welding area 17, where the welding area 17 covers 3 to 5 plastic corrugated pipe crests 14, such as Figure 4 , Figure 5 As shown, the plastic joint 12 and the plastic bellows 11 rotate synchronously with the first reducer 801 and the second reducer 802, and the welding process parameters include: the laser emitted by the semiconductor laser 2 is in the short-wave infrared region, the welding laser wavelength is 980nm, the welding laser power is 150W, the plastic joint and the plastic bellows rotate synchronously at a speed of 100 degrees / second, so that the light spot emitted by the semiconductor laser 2 moves at a speed of 4000mm / s, forming a 2mm*18mm rectangular light spot 13, as shown Figure 5 As shown, multiple wave peaks 14 in the welding area 17 are welded simultaneously to ensure the consistency of welding.

[0045] The control driving mechanism 4 places the two-dimensional scanning galvanometer 5 above the right clamping fixture assembly 8, as shown in FIG. Figure 1 As shown, the center position of the protective window 6 is aligned with the area to be welded 17, and the upper computer and PLC (programmable logic controller) simultaneously control the semiconductor laser 2 to emit the laser beam 7, the swing speed and swing angle of the X and Y galvanometer scanning heads in the two-dimensional scanning galvanometer 5, and the reducer 1 and the reducer 2 to rotate 720° around the Y axis, so that the rectangular light spot 13 produced after the conversion by the two-dimensional scanning galvanometer 5 can emit light within the time of rotation of 720°, and at the same time, multiple wave peaks 14 in the welding area 17 are welded, and the welding area 17 is welded 360°, thereby ensuring the sealing and consistency of the welding.

[0046] S3. The infrared temperature sensor monitors the temperature change in the welding area 17 in real time. The temperature in the welding area 17 fed back by the infrared temperature sensor is compared with the standard value, and the parameters of the welding laser power are adjusted in real time until the welding of the plastic joint and the plastic bellows is completed, ensuring that the plastic joint 12 and the plastic bellows 11 will not be excessively melted due to excessively high welding temperature during the welding process, thereby causing damage to the workpiece.

[0047] The standard value refers to a clear value obtained through scientific measurement and analysis under certain conditions. In the manufacturing process, each performance indicator of the product has a corresponding standard value. In the present invention, the standard value of the welding temperature on the welding area 17 is 210°C, and the laser welding temperature is allowed to fluctuate ±5°C above and below the standard value. If the laser welding temperature is too high or too low compared with the standard value, the welding laser power can be adjusted in real time through the feedback of the infrared temperature sensor to ensure the stability of the welding temperature.

Claims

1. A laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle, characterized in that: The semiconductor laser (2) is located below the workbench (1); a slide rail (3) is provided on the workbench (1); a driving mechanism (4) is installed on the slide rail (3); a two-dimensional scanning galvanometer (5) is located directly above the driving mechanism (4); a protective window (6) is installed at the light outlet of the two-dimensional scanning galvanometer (5); an infrared temperature sensor is installed on the protective window (6); and two clamping tooling assemblies (8) are respectively provided at the left front and right front of the slide rail (3); The QBH head is located behind the two-dimensional scanning galvanometer (5), and the semiconductor laser (2) and the QBH head are connected by an optical fiber (201); In the clamping fixture assembly (8), the first reducer (801) and the joint fixing assembly (9) are fastened together by bolts; the joint fixing base (901) is arranged at the bottom end of the joint fixing assembly (9), the light-transmitting plastic joint (12) is placed on the joint fixing base (901), and a joint fixing upper cover (902) is arranged directly above the light-transmitting plastic joint (12); the latch (903) is inserted from the top of the joint fixing assembly (9) and the bottom end is inserted into the groove above the joint fixing upper cover (902); The T-shaped pipeline fixing assembly (10) and the second reducer (802) are fastened together by bolts, and a sliding groove is provided on the T-shaped pipeline fixing assembly (10); the left sliding arm (1002) is provided on the left side of the pipeline fixing assembly (10), and the right sliding arm (1004) is provided on the right side of the T-shaped pipeline fixing assembly (10); The lower clamping block (1005) is fixed to the T-shaped pipe fixing assembly (10) by bolts and is located between the left sliding arm (1002) and the right sliding arm (1004); the inverted L-shaped left clamping block (1001) is provided with an arc groove and is arranged directly behind the left sliding arm (1002), and one end with the arc groove is placed on the lower clamping block (1005); the inverted L-shaped right clamping block (1003) is provided with an arc groove and is arranged directly behind the right sliding arm (1004), and one end with the arc groove is placed on the lower clamping block (1005); An upper and lower sliding block (1008) is provided below the T-shaped pipeline fixing assembly (10), and four T-shaped connecting columns (1006) are provided through the upper and lower sliding blocks (1008); a spring (1007) is sleeved on the outer side of each T-shaped connecting column (1006); two oblique tie bars (1009) are connected to the middle position of the upper and lower sliding blocks (1008), and the other ends of the oblique tie bars (1009) are respectively connected to the left sliding arm (1002) and the right sliding arm (1004); A hydraulic cylinder (16) is provided below the upper and lower sliding blocks (1008); By regulating the two-dimensional scanning galvanometer (5), the laser beam (7) emitted by the semiconductor laser (2) is controlled to move rapidly to form a light spot (13). During welding, the length of the light spot (13) can cover a plurality of wave crests (14) that need to be welded.

2. The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 1 is characterized in that: A weighing pulley is installed on the bottom foot of the workbench (1) to facilitate the movement of the workbench (1).

3. The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 1 is characterized in that: The two-dimensional scanning galvanometer (5) is provided with two galvanometer scanning heads, X and Y, which are driven by a high-speed servo motor.

4. The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 1 is characterized in that: A U-shaped groove is provided in the middle of the lower clamping block (1005).

5. The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 1 is characterized in that: The top ends of the T-shaped connecting column (1006) are rigidly connected to the left sliding arm (1002) and the right sliding arm (1004) respectively.

6. The laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 1 is characterized in that: The upper and lower ends of the spring (1007) are respectively fixed on the left sliding arm (1002), the right sliding arm (1004) and the upper and lower sliding blocks (1008).

7. A laser welding method for a plastic joint and a plastic corrugated pipe for a vehicle, wherein the laser welding device for a plastic joint and a plastic corrugated pipe for a vehicle according to any one of claims 1 to 6 is used to fix the plastic joint and the plastic corrugated pipe to be welded, and the method is characterized in that: The steps include: S1, installing the plastic joint (12) and the plastic corrugated pipe (11) to be welded in the clamping tool assembly (8); S2, welding is performed on the welding area (17), wherein the welding area (17) covers 3 to 5 wave crests (14) of the plastic bellows, and the plastic joint (12) and the plastic bellows (11) rotate synchronously with the first reducer (801) and the second reducer (802); S3, using an infrared temperature sensor to monitor the temperature change in the welding area (17) in real time until the welding of the plastic joint (12) and the plastic corrugated tube (11) is completed; Real-time monitoring is performed by comparing the temperature of the welding area (17) fed back by the infrared temperature sensor with the standard value to adjust the parameters of the welding laser power.

8. The laser welding method for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 7, characterized in that: The plastic joint (12) in S1 is a laser-transmissive material, such as PA or PC engineering plastics; the plastic corrugated tube (11) in S2 is a laser-impermeable material, such as PA or PC engineering plastics.

9. The laser welding method for a vehicle plastic joint and a plastic corrugated pipe according to claim 7, characterized in that: The laser emitted by the semiconductor laser (2) in S2 is in the short-wave infrared region, the welding laser wavelength is a wavelength within the range of 800nm ​​to 1064nm, the welding laser power is within the range of 100W to 200W, and the plastic joint and the plastic corrugated pipe rotate synchronously at a speed of 10 to 200 degrees per second.

10. The laser welding method for a plastic joint and a plastic corrugated pipe for a vehicle according to claim 7, characterized in that: In S2, the swing speed and swing angle of the X and Y galvanometer scanning heads in the two-dimensional scanning galvanometer (5) are controlled by PLC software, so that the welding spot moves at a speed of 50 mm / s to 8000 mm / s in the welding area (17), forming a (1 mm to 80 mm)*(1 mm to 80 mm) rectangular spot (13).

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