An apparatus and method for welding an aluminum tube weld

Abstract

The application discloses an aluminum pipe welding seam welding device and a method thereof, and relates to the technical field of aluminum pipe welding. The device comprises a workbench, a laser welding head, two detection rods, a floating block and a pendulum type prompting mechanism. The two detection rods abut against the outer walls of the butt joints of two aluminum pipes and independently follow the movement. The floating block is lifted as a whole when the displacement is the same, and is tilted when the displacement is inconsistent. The pendulum type prompting mechanism prompts the continuity of the outer wall accordingly, and avoids misjudgment caused by different pipe diameters. The first rollers at the top of the two detection rods abut against the outer walls of the butt joints of the two aluminum pipes, and the second rollers at the bottom press against the floating block, so that the difference in the continuity of the outer wall is converted into the posture change of the floating block. When the butt joint is smooth, the displacements of the two detection rods are consistent, and the floating block is kept horizontal or is lifted as a whole. When there is a misalignment or a height difference, the floating block is tilted, so that the poor butt joint can be identified before welding.

Description

Technical Field

[0001] This invention relates to the field of aluminum tube welding technology, and in particular to an aluminum tube weld seam welding device and method. Background Technology

[0002] In the butt welding process of aluminum tubes, it is usually necessary to first clamp and position the two aluminum tubes separately, then bring their ends close together to form a butt joint, and then weld them. After the butt joint is completed, even if the two aluminum tubes appear to be basically coaxial from an overall appearance, there is still a possibility that the two aluminum tubes are not perfectly aligned during welding. If welding is carried out directly in this state, the distribution of the weld pool at the ends of the two aluminum tubes is prone to unevenness, which may cause insufficient fusion on one side of the weld and molten accumulation on the other side, thus affecting the forming quality and sealing reliability of the aluminum tube butt weld. Therefore, before welding, it is necessary to check the continuity of the outer walls on both sides of the butt joint of the two aluminum tubes to confirm that the two aluminum tubes are truly in a smooth transition state near the butt joint.

[0003] Existing inspection methods mostly rely on manual visual inspection, caliper comparison, or single-point contact inspection. Manual visual inspection is greatly affected by the observation angle and experience, making it difficult to detect subtle misalignments on both sides of the joint in a timely manner; caliper inspection requires repeated contact measurements, resulting in low inspection efficiency; while single-point contact inspection can reflect the runout of the aluminum tube's outer wall, it does not easily demonstrate the relative continuity between the outer walls on both sides of the joint. Especially when the two aluminum tubes are basically aligned, minor misalignments are often not obvious and are easily overlooked before welding. Therefore, we propose a welding device and method for aluminum tube welds. Summary of the Invention

[0004] The purpose of this invention is to provide an aluminum tube weld seam welding device and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an aluminum tube weld seam welding device, comprising: A workbench is provided to support the two aluminum tubes to be joined and to provide an installation reference for continuous testing of the joint. A laser welding head is provided at the top of the workbench. The detection rods are symmetrically arranged above the workbench. The two detection rods are respectively used to abut against the outer wall of the two aluminum tubes near the joint, and can move independently as the height of the corresponding aluminum tube outer wall changes. A floating block is disposed below the two detection rods. An adjustment mechanism is provided between the detection rods and the floating block so that the floating block can rise and fall as a whole when the two detection rods move in the same direction and in the same amount, and tilt when the movement amounts of the two detection rods are inconsistent, thereby converting the continuity difference of the outer walls on both sides of the joint of the two aluminum tubes into the posture change of the floating block. A pendulum-type prompting mechanism is disposed at the bottom end of the floating block. It is used to output a prompt on the continuity of the outer wall of the joint of the two aluminum tubes according to the tilt state of the floating block, and to use the tilt state as the judgment basis when the overall height of the floating block changes due to different outer diameters of the aluminum tubes.

[0006] Preferably, the top end of the detection rod is provided with a first rotating groove, and the inner wall of the first rotating groove is rotatably connected to a first roller for contacting the outer wall of the aluminum tube. The first roller is used to roll along the outer wall of the aluminum tube during the rotation detection process to reduce frictional interference between the detection rod and the outer wall of the aluminum tube.

[0007] Preferably, the adjustment mechanism includes: A sliding frame, wherein the floating block is disposed inside the sliding frame, a top frame is fixedly connected to the top of the sliding frame, and a connecting mechanism is provided between the floating block and the sliding frame; A floating rod is provided, and a positioning mechanism is provided between the detection rod and the floating rod. The bottom end of the floating rod passes through the top end of the top frame and the top end of the sliding frame and extends into the interior of the sliding frame. The floating rod is used to move vertically with the detection rod and transmit the movement state of the detection rod to the floating block. The connecting mechanism is used to provide an upward elastic support force to the floating block so that the floating block keeps in a state of following and pressing against the floating rod. The second roller has a second rotating groove at the bottom end of the floating rod. The second roller is rotatably connected to the inner wall of the second rotating groove. The second roller is used to contact the top of the floating block, so that the detection rod and the floating block form a rolling pressing fit, thereby reducing the reverse restraint of the detection rod on the other side by the movement of the detection rod on one side.

[0008] Preferably, the pendulum-type prompting mechanism includes: The scale lines are set on the front of the floating block and change their relative attitude synchronously with the tilt of the floating block; The first fixing plate is symmetrically and fixedly connected to the bottom end of the floating block; A rotating shaft is rotatably connected between the two first fixed plates; A connecting rod, which is fixedly connected to the outer wall of the rotating shaft; A counterweight is fixedly connected to the bottom end of the connecting rod. It is used to maintain the connecting rod in a vertical reference state under the action of gravity. An indicator needle is fixedly connected to the front of the counterweight, with its tip located in the scale area, to indicate the tilt direction and degree of the floating block by the offset of the indicator needle relative to the scale line.

[0009] Preferably, the connecting mechanism includes: The first connecting ring is symmetrically and fixedly connected to both sides of the floating block; A pull rope, one end of which is connected to the first connecting ring; The fixed pulley is symmetrically fixed to the inner wall of the sliding frame with a second fixed plate. The fixed pulley is rotatably connected between the two second fixed plates. The other end of the pull rope passes around the outer wall of the first connecting ring and is provided with a pulling mechanism, so that the pulling mechanism can apply an upward flexible holding force to the floating block through the pull rope, and allow the floating block to switch freely between overall lifting and tilting.

[0010] Preferably, the pulling mechanism includes: A base block, which is fixedly connected to the inner wall of the sliding frame; A movable groove is formed at the top of the bottom block; The slider has its outer wall slidably connected to the inner wall of the movable groove, and a second connecting ring is fixedly connected to the top of the slider. The other end of the pull rope is connected to the second connecting ring. A card frame is fixedly connected to the top opening of the movable slot, and the pull rope is inserted inside the card frame; A first spring is disposed between the card frame and the slider, and the first spring is used to provide a yielding elastic support force to the floating block through the slider and the pull rope.

[0011] Preferably, the top of the top frame has a first movable hole, and the floating rod is inserted into the inner wall of the first movable hole. The top of the sliding frame has a second movable hole, and the floating rod is inserted into the inner wall of the second movable hole. A limit ring is fixedly sleeved on the outer wall of the floating rod between the top frame and the sliding frame. A second spring is provided between the limit ring and the sliding frame. The second spring is sleeved on the outer wall of the floating rod. The second spring is used to keep the floating rod in an upward reset trend and cooperate with the detection rod to keep the first roller continuously in contact with the outer wall of the aluminum tube.

[0012] Preferably, the positioning mechanism includes: An adjustment groove is provided at the top of the floating rod, and the detection rod is inserted into the inner wall of the adjustment groove. The third movable hole is symmetrically opened on the outer wall of the detection rod; A positioning shaft is inserted into the inner wall of the third movable hole, and a pressing mechanism is provided between the two positioning shafts; Positioning holes are spaced apart on the outer wall of the floating rod, and the positioning shaft is inserted into the inner wall of one of the positioning holes. The effective height of the detection rod can be changed through different positioning holes, so that the device can be adapted to aluminum tubes with different outer diameters and the floating block is within a preset floating stroke range.

[0013] Preferably, the extrusion mechanism includes: A connecting cavity, wherein the connecting cavity is formed between the two third movable holes; A connecting block, which is fixedly connected to one end of the positioning shaft, and the outer wall of the connecting block is slidably connected to the inner wall of the communicating cavity; The third spring, located between the two connecting blocks, is used to push the two positioning shafts into their respective positioning holes and release the positioning between the detection rod and the floating rod when the two positioning shafts are pressed, so as to achieve rapid switching of the detection rod height.

[0014] A welding method for aluminum tube welds, comprising: Step 1: According to the outer diameter of the aluminum tube to be welded, adjust the extension height of the two detection rods relative to the corresponding floating rods so that the two first rollers press against the outer wall of the two aluminum tubes near the joint, and make the floating block within the floating stroke range that can be raised and lowered as a whole and tilted. Step 2: Drive the two connected aluminum tubes to rotate synchronously around their own axis, so that the two detection rods move independently along the outer wall contour of the corresponding aluminum tubes near the connection point, and the displacement state of the two detection rods is transmitted to the floating block by rolling and pressing through the second roller at the bottom of the floating rod. Step 3: When the two detection rods move in the same direction and with the same amount, the floating block rises and falls as a whole with the two detection rods, and the pendulum-type prompting mechanism remains in the center prompting state; when the movement of the two detection rods is inconsistent, the floating block tilts under the pressure difference of the two second rollers. Step 4: Use the counterweight to keep the indicator needle in the gravity reference direction, and determine whether the outer walls on both sides of the joint of the two aluminum tubes are continuous by the relative offset between the scale line tilted with the floating block and the indicator needle. Step 5: When the relative offset is within the preset allowable range, it is determined that the continuity of the outer wall at the joint of the two aluminum tubes meets the welding requirements; when the relative offset exceeds the preset allowable range, the welding advance operation is stopped and the joint state of the two aluminum tubes is readjusted.

[0015] The technical effects and advantages of this invention are as follows: (1) The present invention sets detection rods on both sides of the joint of two aluminum tubes, and makes the first rollers at the top of the two detection rods abut against the outer wall of the two aluminum tubes near the joint, and the second rollers at the bottom of the two detection rods press against the floating block together, so that the floating block can change its posture according to the relative height of the two detection rods. When the outer wall of the joint of the two aluminum tubes is continuous and smooth, the displacement of the two detection rods with the rotation of the aluminum tubes is basically the same, and the floating block remains horizontal or only rises and falls as a whole. When there are slight misalignments, height differences or local misalignment of the two aluminum tubes at the joint, one of the detection rods will produce different displacements relative to the other detection rod, causing the floating block to tilt. Thus, the present invention can convert the continuity difference of the outer wall on both sides of the joint of the two aluminum tubes into the tilt state of the floating block, which makes it easier to find the poor joint problem that is not easily identified by the overall appearance before welding.

[0016] (2) The present invention sets up a pendulum-type prompting mechanism consisting of a scale line, a first fixed plate, a rotating shaft, a connecting rod, a counterweight, and an indicator needle. The first fixed plate and the scale line tilt synchronously with the floating block, while the connecting rod and the indicator needle tend to be vertical under the action of the counterweight. When the overall height of the floating block changes due to different specifications of aluminum tubes, the pendulum-type prompting mechanism rises and falls with the floating block as a whole, and will not make a misjudgment due to the different initial height of the floating block. Only when the floating block tilts due to the inconsistent displacement of the detection rods on both sides, the indicator needle will deviate from the center position relative to the scale line. Thus, the present invention, based on converting the difference in the continuity of the outer wall into the tilt of the floating block in the first stage, further realizes the effect of intuitively prompting the docking deviation without being affected by the change in the outer diameter of the aluminum tube, and improves the reliability of judging the docking status of the aluminum tube before welding. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the sliding frame of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the sliding frame of the present invention; Figure 4 This is a schematic diagram of the front structure of the floating block of the present invention; Figure 5 This is a front cross-sectional view of the pulling mechanism of the present invention; Figure 6 This is a partial cross-sectional view of the detection rod of the present invention.

[0018] In the attached diagram: 101, workbench; 102, laser welding head; 201, detection rod; 202, first rotating groove; 203, first roller; 301, sliding frame; 302, top frame; 303, floating rod; 304, floating block; 305, second rotating groove; 306, second roller; 401, scale line; 402, first fixed plate; 403, rotating shaft; 404, connecting rod; 405, counterweight; 406, indicator needle; 501, first connecting ring; 502, pull rope. 503, base block; 504, movable groove; 505, slider; 506, second connecting ring; 507, retaining frame; 508, first spring; 509, second fixing plate; 510, fixed pulley; 601, first movable hole; 602, second movable hole; 603, limiting ring; 604, second spring; 701, adjusting groove; 702, third movable hole; 703, positioning shaft; 704, positioning hole; 705, connecting cavity; 706, connecting block; 707, third spring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides, for example Figures 1-6 The aluminum tube welding device shown includes a worktable 101, detection rods 201, a floating block 304, and a pendulum-type prompting mechanism. The worktable 101 supports two aluminum tubes to be joined and provides an installation reference for continuous detection at the joint. A laser welding head 102 is provided at the top of the worktable 101. The detection rods 201 are symmetrically arranged above the worktable 101. The two detection rods 201 are respectively used to abut against the outer wall of the two aluminum tubes near the joint and move independently according to the height change of the corresponding aluminum tube's outer wall. The floating block 304 is located below the two detection rods 201. An adjustment mechanism is provided between the detection rods 201 and the floating block 304 to allow the floating block 304 to move freely. When the two detection rods 201 move in the same direction and with the same amount, they rise and fall as a whole. When the movement amounts of the two detection rods 201 are inconsistent, they tilt, converting the difference in continuity between the outer walls on both sides of the joint of the two aluminum tubes into a change in the posture of the floating block 304. The pendulum-type prompting mechanism is set at the bottom of the floating block 304 to output a prompt on the continuity of the outer walls at the joint of the two aluminum tubes based on the tilt state of the floating block 304. When the overall height of the floating block 304 changes due to different outer diameters of the aluminum tubes, the tilt state is still used as the basis for judgment. This allows the staff to directly judge whether the outer walls on both sides of the joint are smoothly transitioned by visually inspecting whether the aluminum tube ends are level, rather than relying on the change in the posture of the floating block 304.

[0021] The detection rod 201 has a first rotating groove 202 at its top end. The inner wall of the first rotating groove 202 is rotatably connected to a first roller 203 for contacting the outer wall of the aluminum tube. The first roller 203 is used to roll along the outer wall of the aluminum tube during the rotation detection process to reduce frictional interference between the detection rod 201 and the outer wall of the aluminum tube. In specific implementation, the first roller 203 forms rolling contact with the outer wall of the aluminum tube. When the two aluminum tubes rotate around their own axes, the first roller 203 can continuously follow the change in the outer wall contour of the corresponding aluminum tube near the docking point, so that the detection rod 201 can obtain continuous follow-up displacement. Compared with sliding contact, rolling contact can reduce the scratches on the surface of the aluminum tube by the detection rod 201 and reduce the impact of friction jamming on the detection results.

[0022] The adjustment mechanism includes a sliding frame 301, a floating rod 303, and a second roller 306. A floating block 304 is disposed inside the sliding frame 301. A top frame 302 is fixedly connected to the top of the sliding frame 301. A connecting mechanism is provided between the floating block 304 and the sliding frame 301. A positioning mechanism is provided between the detection rod 201 and the floating rod 303. The bottom end of the floating rod 303 passes through the top frame 302 and the top of the sliding frame 301 and extends into the interior of the sliding frame 301. The floating rod 303 moves vertically with the detection rod 201 and transmits the movement state of the detection rod 201 to the floating block 304. The connecting mechanism provides an upward elastic support force to the floating block 304, keeping the floating block 304 in sync with the floating rod 303. In the floating rod 303, a second rotating groove 305 is provided at the bottom end. A second roller 306 is rotatably connected to the inner wall of the second rotating groove 305. The second roller 306 is used to contact the top of the floating block 304, so that the detection rod 201 and the floating block 304 form a rolling pressing fit, so as to reduce the reverse restraint of the movement of one detection rod 201 on the other detection rod 201. In specific implementation, the two second rollers 306 press against the upper two sides of the floating block 304 respectively. When the two floating rods 303 move down or up at the same time, the floating block 304 moves up and down as a whole under the condition that the forces on both sides are basically the same. When the displacement of one floating rod 303 is greater than that of the other side, the pressure change on the corresponding side of the floating block 304 is different, thus forming a tilted posture. Since the second roller 306 and the floating block 304 are only in pressing contact rather than fixedly connected, the tilting of the floating block 304 will not force the other detection rod 201 to move through rigid transmission, which helps to ensure that the two detection rods 201 move independently to their respective aluminum tube outer walls.

[0023] The pendulum-type indicator mechanism includes a scale line 401, a first fixed plate 402, a rotating shaft 403, a connecting rod 404, a counterweight 405, and an indicator needle 406. The scale line 401 is located on the front of the floating block 304 and changes its relative posture synchronously with the tilt of the floating block 304. The first fixed plate 402 is symmetrically fixedly connected to the bottom end of the floating block 304. The rotating shaft 403 is rotatably connected between the two first fixed plates 402. The connecting rod 404 is fixedly connected to the outer wall of the rotating shaft 403. The counterweight 405 is fixedly connected to the bottom end of the connecting rod 404. To maintain the vertical reference state of the connecting rod 404 under gravity, the indicator needle 406 is fixedly connected to the front of the counterweight 405. The top of the indicator needle 406 is located in the area of ​​the scale line 401, so as to indicate the tilt direction and degree of the floating block 304 by the offset of the indicator needle 406 relative to the scale line 401. In specific implementation, the scale line 401 rises and falls and tilts with the floating block 304 as a whole, while the connecting rod 404, the counterweight 405 and the indicator needle 406 maintain a reference direction that tends to be vertical under gravity. When the floating block 304 rises and falls as a whole only because of the difference in the outer diameter of the aluminum tube, the midline relationship of the indicator needle 406 relative to the scale line 401 remains basically unchanged, and no poor docking indication will be formed. When the floating block 304 tilts, the scale line 401 deflects with the floating block 304, while the indicator needle 406 still maintains the gravity reference direction, thereby producing a relative offset, so that the staff can intuitively see the deviation of the two aluminum tubes at the docking point.

[0024] The connecting mechanism includes a first connecting ring 501, a pull rope 502, and a fixed pulley 510. The first connecting ring 501 is symmetrically fixedly connected to both sides of the floating block 304. One end of the pull rope 502 is connected to the first connecting ring 501. Second fixed plates 509 are symmetrically fixedly connected to the inner wall of the sliding frame 301. The fixed pulley 510 is rotatably connected between the two second fixed plates 509. The other end of the pull rope 502 passes around the outer wall of the first connecting ring 501 and is provided with a pulling mechanism, so that the pulling mechanism can apply an upward flexible pulling force to the floating block 304 through the pull rope 502. It allows the floating block 304 to freely switch between overall lifting and tilting. In specific implementation, both sides of the floating block 304 are connected to the corresponding pulling mechanism through the pull rope 502. After the pull rope 502 changes the direction of force through the fixed pulley 510, it forms a flexible upward pull on the floating block 304, so that the floating block 304 can continuously stay close to the second roller 306. At the same time, the flexible holding does not restrict the relative height difference between the two sides of the floating block 304. Therefore, the floating block 304 can both lift and lower as a whole with the synchronous displacement of the two detection rods 201, and tilt when the displacements of the two detection rods 201 are inconsistent.

[0025] The pulling mechanism includes a base block 503, a movable groove 504, a slider 505, a retaining frame 507, and a first spring 508. The base block 503 is fixedly connected to the inner wall of the sliding frame 301. The movable groove 504 is located at the top of the base block 503. The outer wall of the slider 505 is slidably connected to the inner wall of the movable groove 504. A second connecting ring 506 is fixedly connected to the top of the slider 505. The other end of the pull rope 502 is connected to the second connecting ring 506. The retaining frame 507 is fixedly connected to the top opening of the movable groove 504. The pull rope 502 is inserted into the inside of the retaining frame 507. The first spring 508... Spring 508 is disposed between the frame 507 and the slider 505. The first spring 508 is used to provide a yielding elastic support force to the floating block 304 through the slider 505 and the pull rope 502. During the detection process, when the floating block 304 is pressed by the two second rollers 306 and moves downward as a whole or tilts locally, the pull rope 502 drives the slider 505 to move in the movable groove 504 and compress the first spring 508. This yielding elastic support force can prevent the floating block 304 from being rigidly blocked, so that the floating block 304 is always in a floating state that can respond to the displacement difference of the detection rod 201.

[0026] The top frame 302 has a first movable hole 601 at its top, and a floating rod 303 is inserted into the inner wall of the first movable hole 601. The sliding frame 301 has a second movable hole 602 at its top, and the floating rod 303 is inserted into the inner wall of the second movable hole 602. A limit ring 603 is fixedly sleeved on the outer wall of the floating rod 303 between the top frame 302 and the sliding frame 301. A second spring 604 is provided between the limit ring 603 and the sliding frame 301, and the second spring 604 is sleeved on the floating rod 301. On the outer wall of the aluminum tube, the second spring 604 is used to keep the floating rod 303 in an upward reset trend and cooperate with the detection rod 201 to keep the first roller 203 in continuous contact with the outer wall of the aluminum tube. In specific implementation, the first movable hole 601 and the second movable hole 602 together guide the floating rod 303 vertically to reduce the sway of the floating rod 303 during the detection process. The second spring 604 applies a reset force to the floating rod 303 through the limiting ring 603 to keep the first roller 203 in stable contact during the rotation detection of the aluminum tube.

[0027] The positioning mechanism includes an adjusting groove 701, a third movable hole 702, a positioning shaft 703, and positioning holes 704. The adjusting groove 701 is located at the top of the floating rod 303. The detection rod 201 is inserted into the inner wall of the adjusting groove 701. The third movable holes 702 are symmetrically located on the outer wall of the detection rod 201. The positioning shaft 703 is inserted into the inner wall of the third movable hole 702. A pressing mechanism is provided between the two positioning shafts 703. The positioning holes 704 are spaced apart on the outer wall of the floating rod 303. The positioning shaft 703 is inserted into the inner wall of one of the positioning holes 704 to allow the different positioning holes 704 to pass through. 04. Change the effective height of the detection rod 201 to adapt the device to aluminum tubes of different outer diameters and keep the floating block 304 within the preset floating stroke range. In specific implementation, when the outer diameter of the aluminum tube to be welded is large, the extension height of the detection rod 201 relative to the floating rod 303 can be shortened; when the outer diameter of the aluminum tube to be welded is small, the extension height of the detection rod 201 can be increased. This allows the first roller 203 to stably abut against the outer wall of aluminum tubes of different outer diameters and prevents the floating block 304 from being stuck or excessively sinking due to changes in outer diameter, thereby ensuring that the pendulum-type prompting mechanism has stable detection sensitivity.

[0028] The pressing mechanism includes a connecting cavity 705, a connecting block 706, and a third spring 707. The connecting cavity 705 is located between two third movable holes 702. The connecting block 706 is fixedly connected to one end of the positioning shaft 703, and the outer wall of the connecting block 706 is slidably connected to the inner wall of the connecting cavity 705. The third spring 707 is located between the two connecting blocks 706 and is used to push the two positioning shafts 703 into the corresponding positioning holes 704 respectively. When the two positioning shafts 703 are pressed, the positioning between the detection rod 201 and the floating rod 303 is released, thereby achieving... The height of the detection rod 201 can be quickly switched. In practice, the operator can press the two positioning shafts 703 inward at the same time, so that the two positioning shafts 703 overcome the elastic force of the third spring 707 and exit the positioning hole 704. Then, the detection rod 201 can be moved along the adjustment groove 701 to the required height. After releasing the positioning shafts 703, the third spring 707 pushes the two positioning shafts 703 to re-insert into the corresponding positioning hole 704, thus locking the height of the detection rod 201. This structure facilitates the quick adjustment of the detection height when changing aluminum tubes of different specifications, improving the adaptability of the device.

[0029] A welding method for aluminum tube welds, comprising: Step 1: Based on the outer diameter of the aluminum tube to be welded, adjust the extension height of the two detection rods 201 relative to the corresponding floating rods 303 so that the two first rollers 203 press against the outer wall of the two aluminum tubes near the joint, and the floating block 304 is within the floating stroke range that can be raised and lowered as a whole and tilted; specifically, release the positioning of the detection rods 201 and the floating rods 303 by pressing the positioning shaft 703, adjust the extension height of the detection rods 201, and then insert the positioning shaft 703 into the corresponding positioning hole 704, thereby maintaining the effective contact of the first rollers 203 and the effective floating stroke of the floating block 304 under different aluminum tube outer diameters; Step 2: Drive the two connected aluminum tubes to rotate synchronously around their own axes, so that the two detection rods 201 move independently along the outer wall contour of the corresponding aluminum tubes near the connection point. The displacement of the two detection rods 201 is transmitted to the floating block 304 by the second roller 306 at the bottom of the floating rod 303 in a rolling pressing manner. During the rotation detection process, the first roller 203 rolls along the outer wall of the aluminum tube, and the second roller 306 rolls along the top of the floating block 304, so that the following displacement of the detection rods 201 is transmitted in a low-friction manner, reducing the risk of scratches on the aluminum tube surface and detection jamming. Step 3: When the two detection rods 201 move in the same direction and with the same amount, the floating block 304 rises and falls as a whole with the two detection rods 201, and the pendulum-type prompting mechanism remains in the center prompting state; when the movement of the two detection rods 201 is inconsistent, the floating block 304 tilts under the pressure difference of the two second rollers 306; wherein, the movement of the two detection rods 201 in the same direction and with the same amount corresponds to the change of the overall outer diameter of the aluminum tube or the synchronous jumping of the outer walls on both sides, and the floating block 304 rises and falls as a whole without being considered as a docking abnormality; the inconsistent movement of the two detection rods 201 corresponds to the discontinuity of the outer walls on both sides of the docking seam, and the floating block 304 tilts as a basis for judging the docking deviation; Step 4: Using the counterweight 405, the indicator needle 406 is kept in the gravity reference direction. The relative offset between the scale line 401, which tilts with the floating block 304, and the indicator needle 406 is used to determine whether the outer walls on both sides of the joint of the two aluminum tubes are continuous. Specifically, if the indicator needle 406 is always within the allowable middle range of the scale line 401, it means that the outer walls on both sides of the joint maintain a smooth transition during the test. If the indicator needle 406 shifts to one side of the scale line 401, it means that the floating block 304 is tilted in the corresponding direction, thus indicating that there is a misalignment trend at the joint where one side is higher than the other. Step 5: When the relative offset is within the preset allowable range, it is determined that the continuity of the outer wall at the joint of the two aluminum tubes meets the welding requirements; when the relative offset exceeds the preset allowable range, the welding advance operation is stopped and the joint state of the two aluminum tubes is readjusted; after it is determined that the welding requirements are met, the laser welding head 102 is started to weld the joint of the aluminum tubes; when it is determined that the welding requirements are not met, the above detection steps are repeated by re-clamping, fine-tuning the position or correcting the posture of the aluminum tube end until the offset of the indicator needle 406 relative to the scale line 401 is within the preset allowable range.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding device for aluminum tube welds, characterized in that, include: The workbench (101) is used to support the two aluminum tubes to be connected and to provide an installation reference for the continuity detection of the connection point. A laser welding head (102) is provided at the top of the workbench (101). The detection rods (201) are symmetrically arranged above the workbench (101). The two detection rods (201) are respectively used to abut against the outer wall of the two aluminum tubes near the joint, and can move independently as the height of the corresponding aluminum tube outer wall changes. A floating block (304) is disposed below the two detection rods (201). An adjustment mechanism is provided between the detection rods (201) and the floating block (304) so ​​that the floating block (304) can rise and fall as a whole when the two detection rods (201) move in the same direction and in the same amount, and tilt when the movement of the two detection rods (201) is inconsistent, so as to convert the continuity difference of the outer walls on both sides of the joint of the two aluminum tubes into the posture change of the floating block (304). A pendulum-type prompting mechanism is provided at the bottom of the floating block (304) to output a prompt on the continuity of the outer wall of the joint of the two aluminum tubes according to the tilt state of the floating block (304), and to use the tilt state as the judgment basis when the overall height of the floating block (304) changes due to different outer diameters of the aluminum tubes.

2. The aluminum tube weld seam welding device according to claim 1, characterized in that, The top end of the detection rod (201) is provided with a first rotating groove (202), and the inner wall of the first rotating groove (202) is rotatably connected with a first roller (203) for contacting the outer wall of the aluminum tube. The first roller (203) is used to roll along the outer wall of the aluminum tube during the rotation detection process to reduce frictional interference between the detection rod (201) and the outer wall of the aluminum tube.

3. The aluminum tube weld seam welding device according to claim 2, characterized in that, The adjustment mechanism includes: A sliding frame (301) is provided, the floating block (304) is disposed inside the sliding frame (301), the top of the sliding frame (301) is fixedly connected to a top frame (302), and a connecting mechanism is provided between the floating block (304) and the sliding frame (301). A floating rod (303) is provided between the detection rod (201) and the floating rod (303). The bottom end of the floating rod (303) passes through the top of the top frame (302) and the top of the sliding frame (301) and extends into the interior of the sliding frame (301). The floating rod (303) is used to move vertically with the detection rod (201) and transmit the movement state of the detection rod (201) to the floating block (304). The connecting mechanism is used to provide an upward elastic support force to the floating block (304) so ​​that the floating block (304) remains in a state of following and pressing against the floating rod (303). The second roller (306) is rotatably connected to the inner wall of the second rotating groove (305) at the bottom end of the floating rod (303). The second roller (306) is used to contact the top of the floating block (304) so ​​that the detection rod (201) and the floating block (304) form a rolling pressing fit to reduce the reverse restraint of the action of the detection rod (201) on the other side.

4. The aluminum tube weld seam welding device according to claim 3, characterized in that, The pendulum-type prompting mechanism includes: The scale line (401) is set on the front of the floating block (304) and changes its relative posture synchronously with the tilt of the floating block (304); The first fixing plate (402) is symmetrically fixedly connected to the bottom end of the floating block (304); A rotating shaft (403) is rotatably connected between the two first fixed plates (402); A connecting rod (404) is fixedly connected to the outer wall of the rotating shaft (403); A counterweight (405) is fixedly connected to the bottom end of the connecting rod (404) to keep the connecting rod (404) in a vertical reference state under the action of gravity. Indicator (406) is fixedly connected to the front of the counterweight (405), and the top of the indicator (406) is located in the area of ​​the scale line (401) so as to indicate the tilt direction and tilt degree of the floating block (304) by the offset of the indicator (406) relative to the scale line (401).

5. The aluminum tube weld seam welding device according to claim 4, characterized in that, The connecting mechanism includes: The first connecting ring (501) is symmetrically and fixedly connected to both sides of the floating block (304); A pull rope (502), one end of which is connected to the first connecting ring (501); The fixed pulley (510) is symmetrically fixed to the inner wall of the sliding frame (301) with a second fixed plate (509). The fixed pulley (510) is rotatably connected between the two second fixed plates (509). The other end of the pull rope (502) passes around the outer wall of the first connecting ring (501) and is provided with a pulling mechanism, so that the pulling mechanism can apply an upward flexible holding force to the floating block (304) through the pull rope (502) and allow the floating block (304) to switch freely between overall lifting and tilting.

6. The aluminum tube weld seam welding device according to claim 5, characterized in that, The pulling mechanism includes: The bottom block (503) is fixedly connected to the inner wall of the sliding frame (301); An active slot (504) is provided at the top of the bottom block (503); The slider (505) has its outer wall slidably connected to the inner wall of the movable groove (504), and a second connecting ring (506) is fixedly connected to the top of the slider (505). The other end of the pull rope (502) is connected to the second connecting ring (506). Card frame (507), the card frame (507) is fixedly connected to the top opening of the movable groove (504), and the pull rope (502) is inserted into the inside of the card frame (507); A first spring (508) is disposed between the card frame (507) and the slider (505). The first spring (508) is used to provide a yielding elastic support force to the floating block (304) through the slider (505) and the pull rope (502).

7. The aluminum tube weld seam welding device according to claim 6, characterized in that, The top of the top frame (302) has a first movable hole (601), and the floating rod (303) is inserted into the inner wall of the first movable hole (601). The top of the sliding frame (301) has a second movable hole (602), and the floating rod (303) is inserted into the inner wall of the second movable hole (602). A limiting ring (603) is fixedly sleeved on the outer wall of the floating rod (303) between the top frame (302) and the sliding frame (301). A second spring (604) is provided between the limiting ring (603) and the sliding frame (301). The second spring (604) is sleeved on the outer wall of the floating rod (303). The second spring (604) is used to keep the floating rod (303) in an upward reset trend and cooperate with the detection rod (201) to keep the first roller (203) continuously in contact with the outer wall of the aluminum tube.

8. The aluminum tube weld seam welding device according to claim 7, characterized in that, The positioning mechanism includes: An adjustment groove (701) is provided at the top of the floating rod (303), and the detection rod (201) is inserted into the inner wall of the adjustment groove (701). The third movable hole (702) is symmetrically opened on the outer wall of the detection rod (201); A positioning shaft (703) is inserted into the inner wall of the third movable hole (702), and a pressing mechanism is provided between the two positioning shafts (703); Positioning holes (704) are spaced apart on the outer wall of the floating rod (303). The positioning shaft (703) is inserted into the inner wall of one of the positioning holes (704) to change the effective height of the detection rod (201) through different positioning holes (704), so that the device can be adapted to aluminum tubes with different outer diameters and the floating block (304) is within the preset floating stroke range.

9. The aluminum tube weld seam welding device according to claim 8, characterized in that, The extrusion mechanism includes: A connecting cavity (705) is formed between the two third movable holes (702); A connecting block (706) is fixedly connected to one end of the positioning shaft (703), and the outer wall of the connecting block (706) is slidably connected to the inner wall of the communicating cavity (705). The third spring (707) is disposed between the two connecting blocks (706) to push the two positioning shafts (703) into the corresponding positioning holes (704) respectively, and release the positioning between the detection rod (201) and the floating rod (303) when the two positioning shafts (703) are pressed, so as to realize the rapid switching of the height of the detection rod (201).

10. A method for welding aluminum tube seams, applied to the aluminum tube seam welding apparatus described in claim 9, characterized in that, include: Step 1: According to the outer diameter of the aluminum tube to be welded, adjust the extension height of the two detection rods (201) relative to the corresponding floating rod (303) so that the two first rollers (203) press against the outer wall of the two aluminum tubes near the joint, and make the floating block (304) within the floating stroke range that can be raised and lowered as a whole and tilted. Step 2: Drive the two connected aluminum tubes to rotate synchronously around their own axis, so that the two detection rods (201) move independently along the outer wall contour of the corresponding aluminum tubes near the docking point, and transmit the displacement state of the two detection rods (201) to the floating block (304) by rolling and pressing through the second roller (306) at the bottom of the floating rod (303). Step 3: When the two detection rods (201) move in the same direction and in the same amount, the floating block (304) is raised and lowered as a whole with the two detection rods (201), and the pendulum-type prompting mechanism is kept in the middle prompting state; when the movement of the two detection rods (201) is inconsistent, the floating block (304) is tilted under the action of the pressure height difference of the two second rollers (306); Step 4: Use the counterweight (405) to keep the indicator needle (406) in the gravity reference direction, and determine whether the outer walls on both sides of the joint of the two aluminum tubes are continuous by the relative offset between the scale line (401) tilted with the floating block (304) and the indicator needle (406). Step 5: When the relative offset is within the preset allowable range, it is determined that the continuity of the outer wall at the joint of the two aluminum tubes meets the welding requirements; when the relative offset exceeds the preset allowable range, the welding advance operation is stopped and the joint state of the two aluminum tubes is readjusted.

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