Laser brazing tool for synchronously rotating two sides of round pipe joint

Abstract

The utility model provides a laser brazing tool for synchronously rotating two sides of a round pipe joint. The laser brazing tool comprises a rack, a rotating device, a positioning and supporting device, a brazing lifting device and a polishing device. The rotating device achieves coaxial installation and synchronous rotation of the two round pipes through a left three-jaw chuck and a right three-jaw chuck which are in bilateral symmetry and is driven by a permanent magnet synchronous motor controlled by a PLC. The positioning and supporting device adapts to circular pipes with different diameters through a positioning roller and a roller position adjusting mechanism. The brazing lifting device comprises an annular air injection piece, a high-power laser generator and a brazing wire and provides inert gas protection and laser brazing functions. The grinding device comprises a low-power laser generator and a flexible grinding block which are used for preheating and grinding the surface of the round pipe correspondingly. In addition, the rack is provided with a welding waste liquid collecting table, and the environmental protection property is improved. The tool can achieve automatic welding of the round pipe, improves the welding precision and quality, and is high in adaptability, simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] The utility model specifically relates to a synchronously rotating laser brazing tool for round pipe joints at both sides. Background Art

[0002] Laser brazing is a brazing technology that uses laser as a heat source to heat the brazing material to melt. Depending on the heating temperature, when the liquidus temperature of the brazing material is lower than 450°C, it is called soft brazing, and when the liquidus temperature of the brazing material is higher than 450°C, it is called hard brazing. Hard brazing is mainly used for the connection of metal materials. It is a welding method that uses liquid brazing material to fill the gap of solid workpieces to connect metals. During laser brazing, impurities such as oxide film and rust spots on the surface of the parts to be welded are removed, and the parts to be welded are preheated, which is beneficial to the wettability and capillary flow of the brazing material, thereby improving the welding quality.

[0003] For example, the document with the publication number "CN116604121A" discloses an automatic brazing device for metal round tubes, which consists of a base, a main workbench, a fixture support and a brazing support. Self-centering fixtures A and B are installed on the base, which are used to fix round tube a and round tube b respectively, wherein round tube b is connected to the main workbench through a first feeding mechanism to realize the movement and docking of round tube b. The device also includes a second feeding mechanism and a third feeding mechanism, which are respectively connected to the turning mechanism and the brazing material brushing mechanism, and are used for grooving and brazing of round tube b. The induction brazing equipment is installed on the brazing support, and its arc-shaped brazing head is concentric with round tubes a and b, and the melting and filling of the brazing material are realized by induction heating.

[0004] The specific working principle of the brazing device can be clearly understood from the content disclosed in paragraph 0046 of the specification of the public document (so it will not be repeated here). During the welding process, the round tube a is clamped on the self-centering fixture A. During the entire brazing process, the round tube a remains stationary and does not move. The round tube b starts from the initial position and is driven by the first feeding mechanism to move to the tool processing position. At the tool processing position, the round tube b rotates and is processed into a groove. After the groove is completed, the round tube b moves to the brazing material brushing mechanism and evenly applies the brazing material. After applying the brazing material, the round tube b moves to the sleeve end of the round tube a and places the groove area into the sleeve of the round tube a. Finally, the round tube b remains stationary during the brazing process until the brazing is completed and taken out. In summary, the round tube a in the brazing device remains stationary during the entire brazing process, and although the round tube b moves in the early stage (such as moving to the tool processing position, the brazing material brushing position, etc.), it also remains stationary in the final welding stage.

[0005] First, this static welding method of two round tubes limits the improvement of welding effect. When molten brazing filler metal is applied to round tube b, the molten brazing filler metal tends to flow vertically downward under the action of gravity, making it easy for the brazing filler metal to accumulate under the round tube, resulting in uneven distribution of brazing filler metal and uneven heat distribution at the welded part, which directly affects the quality and strength of the welded joint. This leads to poor welding positioning accuracy, low coaxiality of welded round tubes, and uneven welds.

[0006] Secondly, there is a lack of circulation of inert protective gas during the welding process, which easily leads to defects such as welding porosity and weld nodules, restricting the quality of round pipe welding joints. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a synchronously rotating laser brazing tool for both sides of a round tube joint in view of the deficiencies of the above-mentioned prior art. By synchronously rotating two round tubes with two sets of three-jaw chucks, the uniform flow of the brazing material can be promoted, the heat distribution can be optimized, the welding positioning accuracy and the weld uniformity can be improved, and by adding an annular jet part and introducing an inert protective gas, defects such as pores and weld nodules can be reduced, thereby improving the welding quality.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a synchronously rotating laser brazing tool for round tube joints on both sides, comprising a frame, a rotating device is installed on the frame, a positioning support device capable of supporting and guiding the round tube for brazing is arranged in the middle of the rotating device, a brazing lifting device is arranged on one side of the positioning support device, and a grinding device opposite to the brazing lifting device is arranged on the other side of the positioning support device; the characteristic is that the rotating device comprises a left three-jaw chuck and a right three-jaw chuck which are arranged symmetrically on the left and right sides, and the left three-jaw A first round tube is installed at the chuck, and a second round tube is installed at the right three-jaw chuck. The first round tube and the second round tube are coaxially arranged. The left three-jaw chuck and the right three-jaw chuck are respectively linked with a rotating drive mechanism. The left three-jaw chuck and the right three-jaw chuck respectively drive the round tube to rotate under the drive of the rotating drive mechanism. The rotating drive mechanism is linked with a sliding drive mechanism. The left three-jaw chuck or the right three-jaw chuck reciprocates along the center line between the left three-jaw chuck and the right three-jaw chuck through the rotating drive mechanism and driven by the sliding drive mechanism.

[0009] The coaxial installation and synchronous rotation of the two round tubes (the first round tube and the second round tube) are achieved through the rotating device on the frame. The left three-jaw chuck and the right three-jaw chuck clamp the two round tubes respectively, and the relative position between the two chucks is adjusted by the sliding drive mechanism to ensure the precise docking of the round tubes during the welding process. At the same time, the two chucks are driven by the rotating drive mechanism to achieve the synchronous rotation of the two round tubes. By rotating the two round tubes synchronously with two sets of three-jaw chucks, the heat distribution can be optimized and the uniform flow of the solder can be promoted, thereby improving the welding efficiency and welding quality. Synchronous rotation helps to ensure the uniform distribution of the solder in the gap, the uniform distribution of heat, the uniformity of the weld, the reduction of thermal stress during welding, and the risk of welding deformation and cracking.

[0010] The above-mentioned laser brazing tooling for synchronous rotation on both sides of a round pipe joint can be further configured as follows: the rotation drive mechanism includes a permanent magnet synchronous motor, a PLC controller, and a servo drive device, the PLC controller sends a pulse signal to control the servo drive device, and the servo drive device controls the permanent magnet synchronous motors on both sides to rotate synchronously after receiving the signal.

[0011] By sending pulse signals through a single PLC controller to control the servo drive device, it is possible to ensure that the two permanent magnet synchronous motors rotate completely synchronously, and it is also convenient to control the rotation speed, ensuring that the two round tubes rotate synchronously without relative displacement, thereby improving the welding success rate.

[0012] The above-mentioned synchronously rotating laser brazing tooling for both sides of a round tube joint can be further configured as follows: the sliding drive mechanism includes a first slide rail and a first slider, the first slide rail is fixedly mounted on a frame, the lower part of the first slider is slidably matched with the first slide rail, the upper part of the first slider is linked to the body of the permanent magnet synchronous motor, and the first slider is linked to a driving source.

[0013] The driving source can be a cylinder or other components, as long as it can control the reciprocating movement of the first slider. The first slider and the first slide rail can slide together to drive the three-jaw chuck to slide along the slide rail, and the relative positions of the two sets of three-jaw chucks can be adjusted, so that the welding tool can adapt to different lengths of round pipes, thereby increasing the applicability of the welding tool.

[0014] The above-mentioned synchronously rotating laser brazing tooling on both sides of a round tube joint can be further configured as follows: the positioning support device includes a plurality of groups of positioning rollers symmetrically distributed on both sides of the first round tube and the second round tube, each group of positioning rollers corresponds to a group of roller mounting blocks, the positioning rollers are hinged to the roller mounting blocks through rotating shafts, and the roller mounting blocks are linked to a roller position adjustment mechanism.

[0015] The positioning roller plays a positioning and supporting role by closely contacting the round pipe to be welded, while reducing the friction resistance when the round pipe rotates. The roller position adjustment mechanism can adjust the position of the roller mounting block and the positioning roller on it to meet the welding requirements of round pipes of different diameters.

[0016] The above-mentioned synchronously rotating laser brazing tooling on both sides of a round tube joint can be further configured as: the roller position adjustment mechanism includes a second slide rail, the second slide rail is fixed on the frame, and the second slide rail is distributed along an axial direction perpendicular to the first round tube, a third slide rail is arranged above the second slide rail, and a first sliding groove slidably matched with the second slide rail is arranged at the lower end of the third slide rail, a removable first fastener is arranged between the second slide rail and the third slide rail, the third slide rail is distributed along an axial direction perpendicular to the first round tube, and the third slide rail is inclined to the second slide rail, a second sliding groove slidably matched with the third slide rail is arranged on the side of the roller mounting block, and a removable second fastener is arranged between the roller mounting block and the third slide rail.

[0017] By changing the position of the third slide rail on the second slide rail, the position of the positioning roller can be adjusted in a direction perpendicular to the round tube. The third slide rail is tilted and the position of the roller mounting block on the third slide rail is changed to better adapt to the shape of the round tube. Since the outer circumference of the round tube is circular, the third slide rail is tilted to not only achieve longitudinal adjustment, but also adapt to changes in the outer diameter. Among them, the first fastener and the second fastener can both use standard parts such as bolts.

[0018] The above-mentioned synchronously rotating laser brazing tooling for a round tube joint on both sides can be further configured as follows: the brazing lifting device includes an annular jet component, a high-power laser generator, and a brazing wire; the annular jet component is arc-shaped and surrounds the first round tube and the second round tube at the place to be welded; a mounting hole is penetrated through the middle of the annular jet component; the high-power laser generator and the brazing wire are fixed in the mounting hole; airway structures are symmetrically arranged on both sides of the mounting hole; the airway structure includes an air inlet arranged on the outside of the annular jet component, and several groups of air outlets are arranged at intervals from each other and arranged on the inside of the annular jet component; a gas flow channel is provided between the air inlet and the air outlet, and the gas flow channel connects several groups of air outlets to the air inlet at the same time.

[0019] The high-power laser generator and the brazing wire are aligned with the part of the round tube to be welded through the mounting hole in the middle of the annular jet. The high-power laser generator heats and melts the brazing wire to achieve the brazing connection of the round tube. During the laser brazing process, the annular jet introduces an inert protective gas (such as argon) through the air inlet. The inert gas is distributed to several groups of outlets through the gas flow channel and sprayed in a ring shape to the welding part of the round tube. This can not only prevent the oxygen in the air from reacting with the high-temperature brazing material to generate defects such as welding pores, but also inhibit oxidation and spattering during welding, thereby improving welding quality and joint strength.

[0020] The above-mentioned synchronously rotating laser brazing tooling on both sides of a circular pipe joint can be further configured as: the upper end of the annular jet component is linked with a multi-degree-of-freedom support frame, and the multi-degree-of-freedom support frame includes a longitudinal guide rod, a horizontal guide rod, and a connecting block that are vertically distributed on different planes. One side of the connecting block is provided with a first sliding hole sleeved on the outer periphery of the longitudinal guide rod, and the other side of the connecting block is provided with a second sliding hole sleeved on the outer periphery of the horizontal guide rod, and the central axes of the first sliding hole and the second sliding hole are perpendicular to each other. The longitudinal guide rod is provided with a plurality of groups of longitudinal pin holes uniformly distributed in sequence along the axial direction, one side of the connecting block is provided with a plurality of longitudinal pin holes penetrating the first sliding hole, and the horizontal guide rod is provided with a plurality of horizontal pin holes uniformly distributed in sequence along the axial direction, and one side of the connecting block is provided with two horizontal pin holes penetrating the second sliding hole, and the longitudinal pin hole and the longitudinal pin hole, and the horizontal pin hole and the horizontal pin hole are respectively connected by detachable bolts.

[0021] The positions of a high-power laser generator, a brazing wire and an annular jet component can be adjusted through the sliding connection of a longitudinal guide rod, a horizontal guide rod and a connecting block.

[0022] The above-mentioned synchronously rotating laser brazing tooling for both sides of a round pipe joint can be further configured as follows: the grinding device includes a mounting block and a low-power laser generator fixed on the mounting block, and a flexible grinding block; the flexible grinding block is provided with an arc-shaped grinding surface on the side away from the mounting block; the mounting block is linked to an active swing arm; the active swing arm is hingedly connected to a driven swing arm at the end away from the mounting block; the driven swing arm is hingedly connected to a lifting slider at the end away from the active swing arm; and the lifting slider is sleeved on the main shaft.

[0023] The laser beam emitted by a low-power laser generator irradiates the surface of the round tube to be welded. The energy of the laser beam causes the surface of the round tube to heat up locally, achieving a preheating effect. Preheating helps to reduce thermal stress during welding, improve the wettability and capillary flow ability of the solder, and thus improve the welding quality. The arc-shaped grinding surface on the flexible grinding block contacts the surface of the round tube to be welded. Since the two round tubes always keep rotating during the laser brazing process, the flexible grinding block will perform grinding movements on the surface of the round tube to remove impurities such as oxide layers, oil stains, rust, etc. on the surface of the round tube, improve the surface finish, and facilitate the infiltration and diffusion of the solder during laser brazing. Among them, pin holes can be processed on the side of the lifting slider, and the lifting slider can be fixed with pins.

[0024] The above-mentioned synchronously rotating laser brazing tooling for both sides of a round tube joint can be further configured as follows: a welding waste liquid collection table is also provided on the frame, and the welding waste liquid collection table is installed below the position to be welded between the first round tube and the second round tube.

[0025] Collect waste liquid, slag and other impurities generated during welding to prevent them from polluting the frame and the surrounding environment, and improve the environmental protection and cleanliness of welding tools.

[0026] Beneficial effects of the utility model:

[0027] By driving the two round tubes to rotate synchronously through the permanent magnet synchronous motors on both sides, the automatic welding process of round tube laser brazing can be realized. The pre-grinding effect of the flexible grinding block can effectively remove impurities such as oxide film and rust spots, thereby improving the welding effect. Pre-heating the round tube to be welded by a low-power laser generator can improve the capillary flow of the molten brazing material, making the weld more uniform and smooth.

[0028] Furthermore, by closely contacting the positioning roller with the round tube to be welded, it can not only play the role of positioning support, but also reduce the friction during the rotation of the round tube and improve the coaxiality of the round tube joint. The introduction of inert protective gas through the annular jet part can ensure that during the welding process, the part to be welded can be filled with inert gas, thereby reducing the generation of welding pores and improving the welding quality.

[0029] Furthermore, by connecting multiple sliders and rails, the flexibility of the welding tool can be improved, and it can adapt to round tubes of different lengths and diameters. By adding a welding waste liquid collection table under the welding joint, high-temperature solder can be prevented from damaging the base bracket, thereby improving the environmental friendliness of the welding tool.

[0030] The laser brazing tooling has a simple overall structure, high welding joint forming quality, low manufacturing cost, and strong applicability, and is not only suitable for round tube welding, but also for solid cylinder welding.

[0031] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0033] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle;

[0034] Figure 3 This is a cross-sectional schematic diagram of an annular jetting member according to an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the structure of the flexible grinding block, low-power laser generator and other parts of the embodiment of the utility model;

[0036] Figure 5 This is a schematic diagram of the connection structure of the longitudinal guide rod and the horizontal guide rod of an embodiment of the utility model;

[0037] Figure 6 This is a schematic diagram of the working process of an embodiment of the utility model;

[0038] Reference numerals: left three-jaw chuck 1, right three-jaw chuck 2, first round tube 3, second round tube 4, permanent magnet synchronous motor 5, PLC controller 6, first slide rail 7, first slider 8, positioning roller 9, roller mounting block 10, second slide rail 11, third slide rail 12, first fastener 13, second fastener 14, annular jet component 15, high-power laser generator 16, brazing wire 17, mounting hole 18, air inlet 19, air outlet 20, gas flow channel 21, longitudinal guide rod 22, horizontal guide rod 23, connecting block 24, first sliding hole 25, second sliding hole 26, longitudinal pin hole 1 27, longitudinal pin hole 28, horizontal pin hole 1 29, horizontal pin hole 2 30, mounting block 31, low-power laser generator 32, flexible grinding block 33, arc-shaped grinding surface 34, active swing arm 35, driven swing arm 36, lifting slider 37, spindle 38, welding waste liquid collection table 39. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figures 1 to 6The laser brazing tooling shown is a synchronously rotating laser brazing tooling on both sides of a round tube joint, comprising a frame with a rotating device installed on the frame, a positioning support device capable of supporting and guiding the round tube for brazing is arranged in the middle of the rotating device, a brazing lifting device is arranged on one side of the positioning support device, and a grinding device opposite to the brazing lifting device is arranged on the other side of the positioning support device.

[0041] The rotating device comprises a left three-jaw chuck 1 and a right three-jaw chuck 2 which are symmetrically arranged. A first round tube 3 is installed at the left three-jaw chuck 1, and a second round tube 4 is installed at the right three-jaw chuck 2. The first round tube 3 and the second round tube 4 are arranged coaxially. The left three-jaw chuck 1 and the right three-jaw chuck 2 are respectively linked with a rotating drive mechanism. The left three-jaw chuck 1 and the right three-jaw chuck 2 respectively drive the round tube to rotate under the drive of the rotating drive mechanism. The rotating drive mechanism is linked with a sliding drive mechanism. The left three-jaw chuck 1 or the right three-jaw chuck 2 reciprocates along the center line between the left three-jaw chuck 1 and the right three-jaw chuck 2 through the rotating drive mechanism under the drive of the sliding drive mechanism. The coaxial installation and synchronous rotation of the two round tubes (the first round tube 3 and the second round tube 4) are realized by the rotating device on the frame. The left three-jaw chuck 1 and the right three-jaw chuck 2 clamp the two round tubes respectively, and adjust the relative position between the two chucks through the sliding drive mechanism to ensure the accurate docking of the round tubes during the welding process. At the same time, the two chucks are driven by the rotary drive mechanism to achieve synchronous rotation of the two round tubes. By rotating the two round tubes synchronously with two sets of three-jaw chucks, the heat distribution can be optimized and the uniform flow of the solder can be promoted, thereby improving the welding efficiency and welding quality. Synchronous rotation helps to ensure the uniform distribution of the solder in the gap, the uniform distribution of heat, improve the uniformity of the weld, reduce thermal stress during welding, and reduce the risk of welding deformation and cracking.

[0042] The rotation drive mechanism includes a permanent magnet synchronous motor 5, a PLC controller 6, and a servo drive device. The PLC controller 6 sends a pulse signal to control the servo drive device. After receiving the signal, the servo drive device controls the permanent magnet synchronous motors 5 on both sides to rotate synchronously. By sending a pulse signal to control the servo drive device by a single PLC controller 6, it is possible to ensure that the two permanent magnet synchronous motors 5 rotate completely synchronously, ensure that the two round tubes rotate synchronously without relative displacement, and improve the welding success rate.

[0043] The sliding drive mechanism includes a first slide rail 7 and a first slider 8. The first slide rail 7 is fixedly mounted on the frame. The lower part of the first slider 8 is slidably matched with the first slide rail 7. The upper part of the first slider 8 is linked with the main body of the permanent magnet synchronous motor 5. The first slider 8 is linked with a driving source (not shown in the figure). The driving source can be a cylinder or other components, as long as it can control the reciprocating movement of the first slider 8. Through the sliding cooperation between the first slider 8 and the first slide rail 7, the three-jaw chuck can be driven to slide along the direction of the slide rail, and the relative positions of the two groups of three-jaw chucks can be adjusted, so that the welding tool can adapt to the lengths of different round pipes, thereby increasing the applicability of the welding tool.

[0044] The positioning support device includes a plurality of groups of positioning rollers 9 symmetrically distributed on both sides of the first round tube 3 and the second round tube 4. Each group of positioning rollers 9 corresponds to a group of roller mounting blocks 10. The positioning rollers 9 are hinged to the roller mounting blocks 10 through a rotating shaft, and the roller mounting blocks 10 are linked with a roller position adjustment mechanism. The positioning rollers 9 play a positioning support role by closely contacting the round tube, while reducing the friction resistance when the round tube rotates. The roller position adjustment mechanism can adjust the position of the roller mounting block 10 and the positioning rollers 9 thereon to meet the welding requirements of round tubes of different diameters.

[0045] The roller position adjustment mechanism includes a second slide rail 11, which is fixed on the frame and distributed along the axis direction perpendicular to the first round tube 3. A third slide rail 12 is arranged above the second slide rail 11, and a first sliding groove slidably matched with the second slide rail 11 is arranged at the lower end of the third slide rail 12. A detachable first fastener 13 is arranged between the second slide rail 11 and the third slide rail 12. The third slide rail 12 is distributed along the axis direction perpendicular to the first round tube 3, and the third slide rail 12 is inclined with the second slide rail 11. A second sliding groove slidably matched with the third slide rail 12 is arranged on the side of the roller mounting block 10, and a detachable second fastener 14 is arranged between the roller mounting block 10 and the third slide rail 12. By changing the position of the third slide rail 12 on the second slide rail 11, the position of the positioning roller 9 can be adjusted along the direction perpendicular to the round tube. The third slide rail 12 is tilted and the position of the roller mounting block 10 on the third slide rail 12 is changed to better adapt to the shape of the round tube. Since the outer circumference of the round tube is circular, the third slide rail 12 is tilted to not only achieve longitudinal adjustment but also adapt to changes in the outer diameter. The first fastener 13 and the second fastener 14 can both be standard parts such as bolts.

[0046] The brazing lifting device includes an annular jet component 15, a high-power laser generator 16, and a brazing wire 17. The annular jet component 15 is arc-shaped and surrounds the welding position of the first round tube 3 and the second round tube 4. A mounting hole 18 is penetrated in the middle of the annular jet component 15. The high-power laser generator 16 and the brazing wire 17 are fixed in the mounting hole 18. The mounting hole 18 is symmetrically provided with an airway structure on both sides. The airway structure includes an air inlet 19 provided on the outside of the annular jet component 15, and a plurality of groups of air outlets 20 arranged at intervals from each other and provided on the inside of the annular jet component 15. A gas flow channel 21 is provided between the air inlet 19 and the air outlet 20. The gas flow channel 21 connects the plurality of groups of air outlets 20 to the air inlet 19 at the same time. The high-power laser generator 16 and the brazing wire 17 are aligned with the welding position of the round tube to be welded through the mounting hole 18 in the middle of the annular jet component 15. The high-power laser generator heats and melts the brazing wire 17 to achieve the brazing connection of the round tube. During the laser brazing process, the annular jet part 15 is fed with an inert protective gas (such as argon) through the gas inlet 19. The inert gas is distributed to a plurality of gas outlets 20 through the gas flow channel 21 and sprayed in a ring shape to the welding part of the round tube. This can not only prevent the oxygen in the air from reacting with the high-temperature brazing material to generate defects such as welding pores, but also inhibit oxidation and spattering during the welding process, thereby improving the welding quality and joint strength.

[0047] The annular jet component 15 is linked with a multi-degree-of-freedom support frame, which includes a longitudinal guide rod 22, a horizontal guide rod 23, and a connecting block 24, which are vertically distributed in different planes from each other. A first sliding hole 25 is provided on one side of the connecting block 24 and is sleeved on the outer periphery of the longitudinal guide rod 22. A second sliding hole 26 is provided on the other side of the connecting block 24 and is sleeved on the outer periphery of the horizontal guide rod 23. The central axes of the first sliding hole 25 and the second sliding hole 26 are perpendicular to each other. The longitudinal guide rod 22 is uniformly provided with a plurality of groups of longitudinal first pin holes 27 in sequence along the axial direction. A longitudinal second pin hole 28 penetrating the first sliding hole 25 is provided on one side of the connecting block 24. The horizontal guide rod 23 is uniformly provided with a plurality of groups of horizontal first pin holes 29 in sequence along the axial direction. A horizontal second pin hole 30 penetrating the second sliding hole 26 is provided on one side of the connecting block 24. The longitudinal first pin hole 27 and the longitudinal second pin hole 28, and the horizontal first pin hole 29 and the horizontal second pin hole 30 are respectively connected by detachable bolts. The positions of the high-power laser generator, the brazing wire 17 and the annular air injection member 15 can be adjusted by sliding connection of the longitudinal guide rod 22 , the horizontal guide rod 23 and the connecting block 24 .

[0048] The grinding device includes a mounting block 31, a low-power laser generator 32 fixed on the mounting block 31, and a flexible grinding block 33. The flexible grinding block 33 is located on a side away from the mounting block 31 and is provided with an arc-shaped grinding surface 34. The mounting block 31 is linked with an active swing arm 35. The active swing arm 35 is hinged with a driven swing arm 36 at the end away from the mounting block 31. The driven swing arm 36 is hinged with a lifting slider 37 at the end away from the active swing arm 35. The lifting slider 37 is sleeved on the main shaft 38. The laser beam emitted by the low-power laser generator 32 irradiates the surface of the round tube to be welded. The energy of the laser beam causes the surface of the round tube to be locally heated to achieve a preheating effect. Preheating helps to reduce thermal stress during welding, improve the wettability and capillary flow ability of the solder, and thus improve the welding quality. The arc-shaped grinding surface 34 on the flexible grinding block 33 contacts the surface of the round tube to be welded. Since the two round tubes keep rotating during the laser brazing process, the flexible grinding block 33 will perform grinding motion on the surface of the round tube to remove the oxide layer, oil stains, rust and other impurities on the surface of the round tube, improve the surface finish, and facilitate the infiltration and diffusion of the brazing material during laser brazing. Among them, the side of the lifting slider 37 can be processed with a pin hole, and the lifting slider can be fixed with a pin or the like.

[0049] The frame is also provided with a welding waste liquid collection platform 39, which is installed below the welding position of the first round tube 3 and the second round tube 4. The waste liquid and slag and other impurities generated during the welding process are collected to prevent them from polluting the frame and the surrounding environment, thereby improving the environmental protection and cleanliness of the welding tooling.

[0050] Working principle:

[0051] like Figure 1 As shown, during the laser brazing process, firstly, the round tube is clamped and installed by the left three-jaw chuck 1, and the various components of the brazing tooling are adjusted to the appropriate position. The position of the rotating device is adjusted to ensure that a suitable small gap is left at the welding point of the round tube to fill the molten brazing material, and the position and angle of the positioning support device are adjusted so that both sides of each round tube are kept in close contact with the positioning roller 9, thereby ensuring the precise positioning and coaxiality requirements of the two round tubes. The position of the brazing lifting device is adjusted to ensure that the annular jet component 15, the high-power laser generator 16 and the brazing wire 17 are located above the side of the round tube to be welded. The position of the grinding device is adjusted to ensure that the flexible grinding block 33 and the low-power laser generator 32 are located above the other side of the round tube welding point.

[0052] The specific process of laser brazing is as follows:

[0053] S1: The servo drive device is controlled by sending a pulse signal through the PLC controller 6. After receiving the signal, the servo drive device controls the permanent magnet synchronous motors 5 on both sides to rotate synchronously; S2: The arc-shaped grinding surface 34 of the flexible grinding block 33 is in close contact with the position of the round tube to be welded, and the oxide layer, oil stains, rust and other impurities on the surface of the round tube to be welded are removed. After the grinding is completed, the grinding block is removed; S3: The low-power laser beam generated by the low-power laser generator 32 preheats the round tube, which can reduce the thermal stress during welding, and at the same time improve the wettability and capillary flow ability of the solder, which helps to improve the welding quality; S4: Inert protective gas is introduced into the annular jet part 15, so that the inert protective gas surrounds the position of the round tube to be welded, prevents the round tube from being oxidized, and improves the welding quality. The welding process is stable, the brazing wire 17 is fed at a constant speed, the high-power laser beam generated by the high-power laser generator 16 heats and melts the brazing wire, and the molten brazing filler fills the position of the round tube to be welded. During the entire welding process, the round tube always keeps a low-speed rotation state, which can effectively ensure that the molten brazing filler is evenly distributed at the position of the round tube to be welded, improve the uniformity of the weld, and improve the quality of the welded joint; S5: until the brazing filler solidifies at the welding position of the round tube to form an effective welding joint, and then the flexible grinding block 33 grinds the surface of the round tube welding joint to ensure that the surface of the round tube welding joint is smooth and flat. After grinding is completed, the PLC controller 6 sends a signal to stop the permanent magnet synchronous motor 5 from rotating, and the left three-jaw chuck 1 is released to remove the welded round tube.

Claims

1. A synchronously rotating laser brazing tool for round tube joints, comprising a frame, a rotating device mounted on the frame, a positioning support device capable of supporting and guiding the round tube for brazing is arranged in the middle of the rotating device, a brazing lifting device is arranged on one side of the positioning support device, and a grinding device opposite to the brazing lifting device is arranged on the other side of the positioning support device; characterized in that: The rotating device includes a left three-jaw chuck and a right three-jaw chuck which are symmetrically arranged on the left and right. A first round tube is installed at the left three-jaw chuck, and a second round tube is installed at the right three-jaw chuck. The first round tube and the second round tube are coaxially arranged. The left three-jaw chuck and the right three-jaw chuck are respectively linked with a rotating drive mechanism. The left three-jaw chuck and the right three-jaw chuck respectively drive the round tube to rotate under the drive of the rotating drive mechanism. The rotating drive mechanism is linked with a sliding drive mechanism. The left three-jaw chuck or the right three-jaw chuck reciprocates along the center line between the left three-jaw chuck and the right three-jaw chuck through the rotating drive mechanism and driven by the sliding drive mechanism.

2. The synchronously rotating laser brazing tool for round pipe joints according to claim 1, characterized in that: The rotation drive mechanism includes a permanent magnet synchronous motor, a PLC controller, and a servo drive device. The PLC controller sends a pulse signal to control the servo drive device, and the servo drive device controls the permanent magnet synchronous motors on both sides to rotate synchronously after receiving the signal.

3. The synchronous rotating laser brazing tool for round pipe joints according to claim 2, characterized in that: The sliding drive mechanism includes a first slide rail and a first slider. The first slide rail is fixedly mounted on the frame. The lower part of the first slider is slidably matched with the first slide rail. The upper part of the first slider is linked to the body of the permanent magnet synchronous motor. The first slider is linked to a driving source.

4. A synchronously rotating laser brazing tool for a round pipe joint according to any one of claims 1 to 3, characterized in that: The positioning support device includes a plurality of groups of positioning rollers symmetrically distributed on both sides of the first circular tube and the second circular tube, each group of positioning rollers corresponds to a group of roller mounting blocks, the positioning rollers are hinged to the roller mounting blocks through rotating shafts, and the roller mounting blocks are linked to a roller position adjustment mechanism.

5. The synchronously rotating laser brazing tool for round pipe joints according to claim 4, characterized in that: The roller position adjustment mechanism includes a second slide rail, the second slide rail is fixed on the frame, and the second slide rail is distributed in an axial direction perpendicular to the first round tube, a third slide rail is arranged above the second slide rail, a first sliding groove slidably matched with the second slide rail is arranged at the lower end of the third slide rail, a detachable first fastener is arranged between the second slide rail and the third slide rail, the third slide rail is distributed in an axial direction perpendicular to the first round tube, and the third slide rail is inclined to the second slide rail, a second sliding groove slidably matched with the third slide rail is arranged on the side of the roller mounting block, and a detachable second fastener is arranged between the roller mounting block and the third slide rail.

6. A synchronously rotating laser brazing tool for a round pipe joint according to any one of claims 1 to 3, characterized in that: The brazing lifting device comprises an annular jet component, a high-power laser generator, and a brazing wire. The annular jet component is arc-shaped and surrounds the to-be-welded parts of the first round tube and the second round tube. A mounting hole is penetrated in the middle of the annular jet component. The high-power laser generator and the brazing wire are fixed in the mounting hole. An airway structure is symmetrically arranged on both sides of the mounting hole. The airway structure comprises an air inlet arranged on the outside of the annular jet component, and a plurality of groups of air outlets arranged at intervals from each other and arranged on the inside of the annular jet component. A gas flow channel is arranged between the air inlet and the air outlet, and the gas flow channel connects the plurality of groups of air outlets with the air inlet at the same time.

7. The synchronously rotating laser brazing tool for round pipe joints according to claim 6, characterized in that: The upper end of the annular jet component is linked to a multi-degree-of-freedom support frame, and the multi-degree-of-freedom support frame includes a longitudinal guide rod, a horizontal guide rod, and a connecting block that are vertically distributed in skew planes with each other. One side of the connecting block is provided with a first sliding hole sleeved on the outer periphery of the longitudinal guide rod, and the other side of the connecting block is provided with a second sliding hole sleeved on the outer periphery of the horizontal guide rod. The central axes of the first sliding hole and the second sliding hole are perpendicular to each other. The longitudinal guide rod is provided with a plurality of groups of longitudinal pin holes evenly distributed in sequence along the axial direction, one side of the connecting block is provided with a plurality of longitudinal pin holes penetrating the first sliding hole, and the horizontal guide rod is provided with a plurality of horizontal pin holes evenly distributed in sequence along the axial direction, and one side of the connecting block is provided with a plurality of horizontal pin holes penetrating the second sliding hole, and the longitudinal pin hole and the longitudinal pin holes, and the horizontal pin hole and the horizontal pin holes are respectively connected by detachable bolts.

8. A synchronously rotating laser brazing tool for a round pipe joint according to any one of claims 1 to 3, characterized in that: The grinding device includes a mounting block, a low-power laser generator fixed on the mounting block, and a flexible grinding block. The flexible grinding block is provided with an arc-shaped grinding surface on a side away from the mounting block. The mounting block is linked to an active swing arm. The active swing arm is hinged to a driven swing arm at the end away from the mounting block. The driven swing arm is hinged to a lifting slider at the end away from the active swing arm. The lifting slider is sleeved on the main shaft.

9. A synchronously rotating laser brazing tool for a round pipe joint according to any one of claims 1 to 3, characterized in that: The frame is also provided with a welding waste liquid collection platform, and the welding waste liquid collection platform is installed below the position to be welded of the first round tube and the second round tube.

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