Metal furniture frame laser welding device

Abstract

This invention discloses a laser welding device for metal furniture frames, belonging to the field of laser welding technology. It includes a working chamber with two sliding seats at the bottom of the inner wall and a slide rail. A robotic arm is located inside the working chamber, along with a main laser head and two symmetrically arranged auxiliary laser heads. A swing mechanism includes a swing block within the working chamber, a pitch-changing mechanism includes a motion plate on top of the auxiliary laser heads, and an internal support mechanism includes multiple support plates below the robotic arm. In this invention, the swing mechanism achieves amplitude adjustment and inertia compensation to eliminate vibration interference. The pitch-changing mechanism dynamically controls the distance between the two beams to optimize the pre-processing window, and the internal support mechanism provides structural support and thermal management. This improves processing flexibility and weld quality while effectively suppressing thermal deformation of thin-walled frames and enhancing the welding strength and stability of highly reflective metal materials.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, and particularly relates to a laser welding device for metal furniture frames. Background Technology

[0002] With the evolution of modern metal furniture manufacturing processes, metal materials with high thermal conductivity and high reflectivity, such as aluminum alloys, stainless steel, and copper, are widely used in the manufacture of furniture frames. Laser welding technology, with its advantages of high energy density, fast welding speed, and small heat-affected zone, has become the preferred solution for joining such materials. However, in actual processing, highly reflective metal materials have extremely low initial absorption rates to conventional wavelength lasers, which can easily lead to energy fluctuations and spatter problems during the welding process, seriously affecting the continuity and strength of the weld.

[0003] To compensate for assembly gaps, existing laser welding equipment often uses high-frequency oscillating welding. However, the inertial torque generated by the reciprocating motion can easily cause vibration at the end of the robotic arm, resulting in periodic ripples or undercut defects in the weld. Although the dual-beam composite processing used in some existing laser welding equipment can improve the energy absorption rate, the spacing between the two beams is usually fixed, making it difficult to simultaneously meet the dual requirements of suppressing oxidation and avoiding spatter, resulting in unsatisfactory welding quality. Furthermore, thin-walled furniture frames are prone to thermoplastic deformation under localized high temperatures. Existing laser welding equipment lacks rapid thermal management methods for weld points, resulting in insufficient dimensional accuracy and welding strength of the final product. Summary of the Invention

[0004] The purpose of this invention is to provide a laser welding device for metal furniture frames, which addresses the problems of uneven welds caused by end-effector vibration in existing laser welding devices, unsatisfactory surface pretreatment effects in existing laser welding devices, and easy thermal deformation of thin-walled parts welded by existing laser welding devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A laser welding device for metal furniture frames includes a working chamber, two sliding seats at the bottom of the inner wall of the working chamber, a slide rail at the bottom of the inner wall of the working chamber, a robotic arm inside the working chamber, a main laser head inside the working chamber, and two auxiliary laser heads symmetrically arranged outside the main laser head.

[0007] The swing mechanism includes a swing block located in the working chamber, which swings around its hinge point to drive the main laser head to perform swing welding.

[0008] The variable pitch mechanism includes a moving plate disposed on the top of the secondary laser head, which changes the distance between the secondary laser head and the main laser head by moving the moving plate radially.

[0009] The internal support mechanism includes multiple support plates located below the robotic arm, which support the inner wall of the furniture frame by synchronous radial expansion of the multiple support plates.

[0010] As a further description of the above technical solution:

[0011] The swing mechanism also includes:

[0012] A protective shell, one side of which is connected to the end of the robotic arm;

[0013] A central shaft, the top end of which passes through the top of the inner wall of the protective shell;

[0014] A bushing, which is fitted outside the central shaft, has two third connecting rods connected to one side of the bushing via a block;

[0015] The first motor is mounted on the top of the protective housing, and its output end is connected to the top of the central shaft.

[0016] As a further description of the above technical solution:

[0017] The swing mechanism also includes:

[0018] A guide frame, the top of which is connected to the bottom of the central shaft;

[0019] Connecting seat, the connecting seat is located on one side of the top of the guide frame;

[0020] The first connecting rod, two first connecting rods are symmetrically arranged on both sides of the connecting seat;

[0021] A deflection frame, wherein the top frame of the deflection frame is slidably connected to the guide frame, and the bottom frame of the deflection frame is rotatably connected to the swing block;

[0022] The second connecting rods are respectively located on both sides of the top frame of the deflection frame.

[0023] As a further description of the above technical solution:

[0024] The swing mechanism also includes:

[0025] Synchronizing frame, two synchronous frames are symmetrically arranged on both sides of the deflection frame, and one end of the first connecting rod is hinged to the middle of the synchronous frame;

[0026] The first stroke groove is formed on the outer wall of one end of the timing frame, and one end of the third connecting rod passes through the first stroke groove;

[0027] The second stroke groove is formed on the outer wall of the other end of the timing frame, and one end of the second connecting rod passes through the second stroke groove.

[0028] As a further description of the above technical solution:

[0029] The swing mechanism also includes:

[0030] A movable plate is located on one side of the central axis, and the top of the movable plate is rotatably connected to the top of the inner wall of the protective shell via a column.

[0031] An electric push rod is located on the top of the protective shell, and the telescopic part of the electric push rod is connected to the top end of the column of the moving plate.

[0032] A floating ring is located below the protective shell;

[0033] A rotating frame is provided below the protective shell. The top end of the rotating frame is rotatably connected to the bottom end of the protective shell at a corresponding position, and the bottom end of the rotating frame is rotatably connected to the protrusion of the side wall of the floating ring.

[0034] The first spring is located above the floating ring, and both ends of the first spring are rotatably connected to the middle of the rotating frame and the top of the floating ring respectively through blocks.

[0035] As a further description of the above technical solution:

[0036] The pitch mechanism also includes:

[0037] Mounting plate, one side of which is connected to one side of the main laser head;

[0038] Limiting grooves, two of which are formed on the top of the mounting plate;

[0039] Guide rails, the two guide rails are respectively provided on both sides of the bottom of the mounting plate;

[0040] The movable seats are slidably connected to guide rails at corresponding positions, and the moving plate is located at the bottom of the movable seats.

[0041] As a further description of the above technical solution:

[0042] The pitch mechanism also includes:

[0043] A telescopic rod, one end of which passes through the outer wall of one end plate of the guide rail, and the other end of which abuts against one side of the movable seat;

[0044] The second spring is located outside the telescopic rod, and its two ends are respectively connected to the outer wall of one end plate of the guide rail and the outer wall of one end of the telescopic rod at corresponding positions.

[0045] A transmission rod, the bottom end of which is connected to the top end of one end of the moving plate, the top end of which passes through a limiting groove, and a pressing block is connected to the top end of the transmission rod.

[0046] As a further description of the above technical solution:

[0047] The pitch mechanism also includes:

[0048] A driven wheel, which is sleeved on the outside of the main laser head;

[0049] A drive wheel, the top of which is rotatably connected to the bottom of the protective shell via a column;

[0050] The second motor is installed at the bottom of the inner wall of the protective shell, and the output end of the second motor is connected to the top of the top column of the drive wheel.

[0051] As a further description of the above technical solution:

[0052] The internal support mechanism also includes:

[0053] A positioning seat, which is embedded in the top of the sliding seat;

[0054] The first sliding groove, and multiple first sliding grooves are formed on the outer wall of the positioning seat around the axis of the positioning seat;

[0055] A movable shaft, one end of which passes through the interior of the positioning seat;

[0056] A lead screw, one end of which is connected to one end of a movable shaft, and the other end of which is connected to a handwheel;

[0057] A fixing sleeve is fitted over the outside of the moving shaft, and one end of the fixing sleeve is connected to one side of the positioning seat;

[0058] The second sliding groove, multiple second sliding grooves are formed on the outer wall of the fixed sleeve around the axis of the fixed sleeve.

[0059] As a further description of the above technical solution:

[0060] The internal support mechanism also includes:

[0061] The first rotating seat, and a plurality of the first rotating seats are arranged around the axis of the moving shaft on the outer wall of the moving shaft, and the first rotating seats are arranged inside the second sliding groove;

[0062] The second rotating seat is located at the bottom of the support plate;

[0063] Synchronizing rods, a plurality of which are arranged around the axis of the moving shaft outside the moving shaft, one end of each synchronizing rod is rotatably connected to a first rotating seat, and the other end of each synchronizing rod is rotatably connected to a second rotating seat;

[0064] A sliding shaft, one end of which is connected to one side of a support plate, and the other end of which passes through a first sliding groove;

[0065] A heat-conducting plate is disposed on the top of the support plate.

[0066] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0067] 1. In this invention, by setting up a swing mechanism, the angle between the axis of the deflection frame and the axis of the swing block can be adjusted in real time, thereby dynamically adjusting the swing amplitude of the main laser head according to the weld gap, which improves the flexibility of the device. At the same time, the elastic potential energy of the first spring is used to absorb and offset the inertial impact generated by the high-frequency swing, eliminating the vibration interference at the end of the robotic arm and ensuring the flatness of the weld edge.

[0068] 2. In this invention, by setting a variable-pitch mechanism, the radial distance between the secondary laser head and the main laser head is precisely controlled, enabling the laser welding device to dynamically find the optimal distance between cleaning and welding according to different environmental humidity, material characteristics and processing speed. While thoroughly removing the oxide layer and improving the energy absorption rate, it effectively isolates the interference of cleaning spatter on the molten pool and improves the welding quality.

[0069] 3. In this invention, by setting an internal support mechanism, multiple support plates and heat-conducting plates perform radial synchronous expansion to support the interior of the furniture frame, thus solving the problem of welding collapse of thin-walled parts. The heat-conducting plates are made of copper with high thermal conductivity and are equipped with heat dissipation grooves, which can quickly remove excess local heat, effectively suppress frame deformation caused by thermal stress, and improve welding strength. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of the main structure of a laser welding device for metal furniture frames proposed in this invention;

[0071] Figure 2 This is a schematic diagram showing the disassembled structure of a laser welding device for metal furniture frames proposed in this invention;

[0072] Figure 3 This is a partial half-section diagram of a laser welding device for metal furniture frames proposed in this invention.

[0073] Figure 4 This is a schematic diagram of the swing mechanism structure of a laser welding device for metal furniture frames proposed in this invention;

[0074] Figure 5 This is a half-sectional view of the swing mechanism of a laser welding device for metal furniture frames proposed in this invention.

[0075] Figure 6 For the present invention Figure 5 A magnified structural diagram of part A in the middle;

[0076] Figure 7This is a half-sectional structural diagram of the variable-pitch mechanism of a laser welding device for metal furniture frames proposed in this invention.

[0077] Figure 8 This is a schematic diagram of the variable-pitch mechanism of a laser welding device for metal furniture frames proposed in this invention.

[0078] Figure 9 This is a schematic diagram of the internal support mechanism of a laser welding device for metal furniture frames proposed in this invention.

[0079] Figure 10 This is a schematic diagram of the internal support mechanism of a laser welding device for metal furniture frames proposed in this invention.

[0080] Legend: 1. Working chamber; 2. Sliding seat; 3. Slide rail; 4. Robotic arm; 5. Swinging mechanism; 501. Protective shell; 502. Central shaft; 503. Guide frame; 504. Connecting seat; 505. First connecting rod; 506. Deflection frame; 507. Second connecting rod; 508. Synchronizing frame; 509. First stroke groove; 510. Second stroke groove; 511. Bushing; 512. Third connecting rod; 513. First motor; 514. Moving plate; 515. Electric push rod; 516. Swing block; 517. Floating ring; 518. Rotating frame; 519. First spring; 6. Main laser head; 7. Variable pitch mechanism; 701. Mounting plate; 702, limiting groove; 703, guide rail; 704, movable seat; 705, telescopic rod; 706, second spring; 707, moving plate; 708, transmission rod; 709, extrusion block; 710, driven wheel; 711, drive wheel; 712, second motor; 8, auxiliary laser head; 9, internal support mechanism; 901, positioning seat; 902, first sliding groove; 903, lead screw; 904, handwheel; 905, moving shaft; 906, first rotating seat; 907, second rotating seat; 908, synchronizing rod; 909, fixed sleeve; 910, second sliding groove; 911, support plate; 912, sliding shaft; 913, heat-conducting plate. Detailed Implementation

[0081] 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.

[0082] Please see Figures 1-10The present invention provides a technical solution: a laser welding device for metal furniture frames, including a working chamber 1, two sliding seats 2 provided at the bottom of the inner wall of the working chamber 1, a slide rail 3 opened at the bottom of the inner wall of the working chamber 1, a robotic arm 4 provided inside the working chamber 1, a main laser head 6 provided inside the working chamber 1, and two auxiliary laser heads 8 symmetrically provided outside the main laser head 6.

[0083] The swing mechanism 5 includes a swing block 516 disposed in the working chamber 1. The swing block 516 swings around its hinge point as the axis to drive the main laser head 6 to perform swing welding.

[0084] The pitch-changing mechanism 7 includes a motion plate 707 disposed on the top of the auxiliary laser head 8, which changes the distance between the auxiliary laser head 8 and the main laser head 6 by radially moving the motion plate 707.

[0085] The internal support mechanism 9 includes multiple support plates 911 located below the robotic arm 4, which support the inner wall of the furniture frame by synchronous radial expansion of the multiple support plates 911.

[0086] The swing mechanism 5 also includes:

[0087] Protective shell 501, one side of which is connected to the end of robotic arm 4;

[0088] Central shaft 502, the top end of central shaft 502 is inserted through the top of the inner wall of protective shell 501;

[0089] Bushing 511 is sleeved outside the central shaft 502, and two third connecting rods 512 are connected to one side of the bushing 511 through a block;

[0090] The first motor 513 is mounted on the top of the protective shell 501, and the output end of the first motor 513 is connected to the top of the central shaft 502.

[0091] The swing mechanism 5 also includes:

[0092] Guide frame 503, the top of guide frame 503 is connected to the bottom of central shaft 502;

[0093] Connecting seat 504 is located on one side of the top of guide frame 503;

[0094] The first connecting rod 505, two first connecting rods 505 are symmetrically arranged on both sides of the connecting seat 504;

[0095] The deflection frame 506 has its top frame slidably connected to the guide frame 503, and its bottom frame rotatably connected to the swing block 516.

[0096] The second connecting rod 507 is located on both sides of the top frame of the deflection frame 506.

[0097] The swing mechanism 5 also includes:

[0098] Synchronous frame 508, two synchronous frames 508 are symmetrically arranged on both sides of deflection frame 506, and one end of the first connecting rod 505 is hinged to the middle of the synchronous frame 508.

[0099] The first stroke groove 509 is opened on the outer wall of one end of the synchronous frame 508, and one end of the third connecting rod 512 passes through the first stroke groove 509.

[0100] The second stroke groove 510 is opened on the outer wall of the other end of the synchronous frame 508, and one end of the second connecting rod 507 passes through the second stroke groove 510.

[0101] The swing mechanism 5 also includes:

[0102] The movable plate 514 is located on one side of the central shaft 502, and the top of the movable plate 514 is rotatably connected to the top of the inner wall of the protective shell 501 through a column.

[0103] Electric push rod 515 is located on the top of protective shell 501, and the telescopic part of electric push rod 515 is connected to the top of the column of the movable plate 514.

[0104] Floating ring 517 is located below the protective shell 501;

[0105] Rotating frame 518 is located below protective shell 501. The top of rotating frame 518 is rotatably connected to the bottom of protective shell 501 at a corresponding position. The bottom of rotating frame 518 is rotatably connected to the protrusion of the side wall of floating ring 517.

[0106] The first spring 519 is located above the floating ring 517, and both ends of the first spring 519 are rotatably connected to the middle of the rotating frame 518 and the top of the floating ring 517 respectively through blocks.

[0107] Specifically: the movable plate 514 and the bushing 511 are radially embedded through the side wall groove. The electric push rod 515 pushes the movable plate 514 down through the telescopic part. The movable plate 514 drives the bushing 511 to move down synchronously. The third connecting rod 512 moves from the top of the first stroke groove 509 to the bottom of the first stroke groove 509. The bushing 511 drives the synchronous frame 508 to rotate clockwise around the first connecting rod 505 through the third connecting rod 512. The second connecting rod 507 moves from the bottom of the second stroke groove 510 to the top of the second stroke groove 510. The second connecting rod 507 drives the deflection frame 506 to rotate counterclockwise around the axis of the swing block 516 along the direction of the guide frame 503. Conversely, when the electric push rod 515 pulls the movable plate 514 up through the telescopic part, the deflection frame 506 rotates clockwise around the axis of the swing block 516 along the direction of the guide frame 503.

[0108] Furthermore, the first motor 513 drives the central shaft 502 to rotate through the output end. When the deflection frame 506 deflects, its axis and the axis of the swing block 516 are at a controlled angle, so that the swing block 516 swings with the axis of its two side columns as the axis. By adjusting the angle between the axis of the deflection frame 506 and the axis of the swing block 516, the amplitude of the swing block 516 can be adjusted. The larger the angle between the axis of the deflection frame 506 and the axis of the swing block 516, the larger the swing amplitude of the swing block 516, and vice versa. The swing block 516 drives the main laser head 6 to swing synchronously, so that the welding trajectory of the main laser head 6 advances in a reciprocating superposition, which increases the width of the weld. At the same time, the swing allows the light spot to be refracted into the side wall of the molten pool multiple times, forcibly increasing the energy absorption rate of the high reflective metal material at the welding point and improving the welding quality.

[0109] Furthermore, when the main laser head 6 swings at high frequency, the inertial force will cause the end of the robotic arm 4 to vibrate, resulting in ripples or edge bite in the weld. When the main laser head 6 swings, the floating ring 517 moves with it and moves horizontally, driving the rotating frame 518 on the corresponding side to rotate counterclockwise and compress the first spring 519. The elastic potential energy of the first spring 519 counteracts the inertial force and eliminates the influence of the vibration at the end of the robotic arm 4 on the welding quality.

[0110] It should be noted that the selection of the first motor 513 in the above description is as needed. The first motor 513 is controlled by the control system built into the working compartment 1. This part is well known in the field and will not be described in detail here.

[0111] It should be noted that the electric actuator 515 mentioned above is a new type of linear actuator composed of a motor, an actuator, and a control device. It is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the actuator. This part is well-known technology in the field and will not be described in detail here.

[0112] Please see Figures 7-8 The pitch mechanism 7 also includes:

[0113] Mounting plate 701, one side of mounting plate 701 is connected to one side of main laser head 6;

[0114] Limiting grooves 702, two limiting grooves 702 are formed on the top of mounting plate 701;

[0115] Guide rails 703, two guide rails 703 are respectively located on both sides of the bottom of the mounting plate 701;

[0116] The movable seat 704 has two movable seats 704 that are slidably connected to the guide rails 703 at corresponding positions, and the moving plate 707 is located at the bottom of the movable seat 704.

[0117] The pitch mechanism 7 also includes:

[0118] Telescopic rod 705, one end of which is inserted through the outer wall of one end plate of guide rail 703, and the other end of telescopic rod 705 abuts against one side of movable seat 704.

[0119] The second spring 706 is located outside the telescopic rod 705, and the two ends of the second spring 706 are respectively connected to the outer wall of one end plate of the guide rail 703 and the outer wall of one end of the telescopic rod 705 at corresponding positions.

[0120] The transmission rod 708 has its bottom end connected to the top end of one end of the moving plate 707, and its top end passes through the limiting groove 702. The top end of the transmission rod 708 is connected to the pressing block 709.

[0121] The pitch mechanism 7 also includes:

[0122] Driven wheel 710, driven wheel 710 is sleeved on the outside of main laser head 6;

[0123] The top of the drive wheel 711 is rotatably connected to the bottom of the protective shell 501 via a column.

[0124] The second motor 712 is installed at the bottom of the inner wall of the protective shell 501, and the output end of the second motor 712 is connected to the top of the top column of the drive wheel 711.

[0125] Specifically: the beam emitted by the main laser head 6 is the welding beam, and the beam emitted by the auxiliary laser head 8 is the cleaning beam. The cleaning beam performs dynamic modification on the surface of the highly reflective metal material on the welding trajectory, reduces the reflectivity of the highly reflective metal material surface, increases the absorption rate of the highly reflective metal material to welding energy, and removes rust from the surface of the highly reflective metal material to improve the welding strength. The distance between the cleaning beam and the welding beam determines the heat dissipation time. If the distance is too far, the cleaned surface may oxidize again. If it is too close, the spatter generated by the cleaning will interfere with the weld pool.

[0126] Furthermore, when the main laser head 6 performs oscillating welding, the second motor 712 drives the drive wheel 711 to rotate through its output end. The drive wheel 711 meshes with the driven wheel 710, thereby driving the driven wheel 710 to rotate synchronously. The outer wall of the tube at the bottom of the driven wheel 710 has an external thread, and the inner wall of the floating ring 517 has an internal thread. The two mesh with each other, so that the floating ring 517 moves along the axis of the driven wheel 710 when the driven wheel 710 rotates. The bottom of the floating ring 517 has a pressing groove, and the inclined surface of the inner wall of the pressing groove abuts against the inclined surface of the top of the pressing block 709. When the floating ring 517 moves downward, the floating ring 517 pushes the pressing block 709 towards the main laser head 6 through the pressing groove. The pressing block 709 drives the moving plate through the transmission rod 708. 707 moves synchronously toward the main laser head 6, the transmission rod 708 moves from one end of the limiting groove 702 to the other end, the moving seat 704 moves along the guide rail 703 following the moving plate 707, one end of the telescopic rod 705 further penetrates the plate on one side of the guide rail 703, the second spring 706 is compressed, the two moving plates 707 on the same side drive the auxiliary laser head 8 on the same side to move toward the main laser head 6, realizing the contraction of the distance between the two beams. Conversely, when the floating ring 517 rises, the auxiliary laser head 8 moves away from the main laser head 6. The auxiliary laser head 8 performs radial reset with the help of the elastic force of the second spring 706. The control system dynamically adjusts the operation mode of the second motor 712 according to the real-time process requirements to realize the adaptive adjustment of the distance between the cleaning beam and the welding beam, so as to achieve the optimal welding quality.

[0127] It should be noted that the selection of the second motor 712 in the above description is optional. The second motor 712 is controlled by the control system built into the working compartment 1. This part is well known in the field and will not be described in detail here.

[0128] Please see Figures 9-10 The internal support mechanism 9 also includes:

[0129] Positioning seat 901 is embedded in the top of sliding seat 2;

[0130] First sliding groove 902, multiple first sliding grooves 902 are formed on the outer wall of positioning seat 901 around the axis of positioning seat 901;

[0131] A movable shaft 905, one end of which passes through the interior of the positioning seat 901;

[0132] Lead screw 903, one end of which is connected to one end of moving shaft 905, and the other end of lead screw 903 is connected to handwheel 904;

[0133] A fixing sleeve 909 is sleeved on the outside of the moving shaft 905, and one end of the fixing sleeve 909 is connected to one side of the positioning seat 901.

[0134] Second sliding groove 910, multiple second sliding grooves 910 are formed around the axis of fixed sleeve 909 on the outer wall of fixed sleeve 909.

[0135] The internal support mechanism 9 also includes:

[0136] First rotating seat 906, multiple first rotating seats 906 are arranged around the axis of moving shaft 905 on the outer wall of moving shaft 905, and the first rotating seat 906 is arranged inside the second sliding groove 910;

[0137] The second rotating seat 907 is located at the bottom of the support plate 911;

[0138] Synchronizing rods 908, multiple synchronizing rods 908 are arranged around the axis of the moving shaft 905 outside the moving shaft 905, one end of the synchronizing rod 908 is rotatably connected to the first rotating seat 906, and the other end of the synchronizing rod 908 is rotatably connected to the second rotating seat 907.

[0139] The sliding shaft 912 has one end connected to one side of the support plate 911, and the other end of the sliding shaft 912 passes through the first sliding groove 902.

[0140] Heat-conducting plate 913 is located on top of support plate 911.

[0141] Specifically: the external thread on the outer wall of the lead screw 903 meshes with the internal thread on the inner wall of the sliding seat 2. Rotating the handwheel 904 causes the lead screw 903 to rotate synchronously, bringing the handwheel 904 closer to the sliding seat 2. The lead screw 903 pushes the moving shaft 905 out relative to the positioning seat 901, causing the moving shaft 905 to slide relative to the fixed sleeve 909. The first rotating seat 906 moves from one end of the second sliding groove 910 to the other end. The first rotating seat 906 pushes the synchronizing rod 908 to rotate clockwise around the first rotating seat 906 as its axis. The top pushes the second rotating seat 907 outward, and the sliding shaft 912 slides along the direction of the first sliding groove 902 to make the support plate 911 move radially relative to the fixed sleeve 909. The heat-conducting plate 913 moves synchronously with the support plate 911. The top of the heat-conducting plate 913 has multiple heat dissipation grooves to increase the contact area between the heat-conducting plate 913 and the air. At the same time, the heat-conducting plate 913 is made of copper, which can quickly remove the heat from the welding point while supporting the inner wall of the furniture frame, preventing the welding point from deforming due to high heat and improving the final welding quality.

[0142] It should be noted that copper, as mentioned above, has high thermal conductivity and is often used in scenarios requiring rapid heat conduction. This part is well-known technology in the field and will not be elaborated upon here.

[0143] Working principle: During use, the operator places the two furniture frame sections to be welded onto the outside of the inner support mechanism 9, and then rotates the handwheel 904 to make the support plate 911 expand radially to form a stable support for the inner wall of the furniture frame. After both furniture frame sections are fixed, the operator pushes the two sliding seats 2 on both sides closer to each other along the slide rail 3 to position and abut the ends of the two furniture frame sections to be welded. The operator controls the start of the first motor 513, the second motor 712 and the electric push rod 515 through the working chamber 1. The robotic arm 4 welds the two furniture frame sections according to the system preset trajectory. After welding is completed, the operator rotates the handwheel 904 in the opposite direction and pushes the two sliding seats 2 on both sides to release the locking of the furniture frame. After the welded furniture frame is taken out, the above operation is repeated to continue processing the remaining furniture frame sections.

[0144] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0145] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser welding device for metal furniture frames, comprising a working chamber (1), characterized in that, The bottom of the inner wall of the working chamber (1) is provided with two sliding seats (2), the bottom of the inner wall of the working chamber (1) is provided with a slide (3), the working chamber (1) is provided with a robotic arm (4), the working chamber (1) is provided with a main laser head (6), and two auxiliary laser heads (8) are symmetrically provided on the outside of the main laser head (6). The swing mechanism (5) includes a swing block (516) located in the working chamber (1). The swing block (516) swings around its hinge point to drive the main laser head (6) to perform swing welding. The variable pitch mechanism (7) includes a motion plate (707) disposed on the top of the auxiliary laser head (8), and the distance between the auxiliary laser head (8) and the main laser head (6) is changed by the radial movement of the motion plate (707); The internal support mechanism (9) includes multiple support plates (911) located below the robotic arm (4), which support the inner wall of the furniture frame by synchronous radial expansion of the multiple support plates (911).

2. The laser welding device for metal furniture frames according to claim 1, characterized in that, The swing mechanism (5) further includes: A protective shell (501) is connected to the end of the robotic arm (4) on one side; A central shaft (502) has its top end inserted through the top of the inner wall of the protective shell (501); A bushing (511) is fitted outside the central shaft (502), and two third connecting rods (512) are connected to one side of the bushing (511) through a block. The first motor (513) is mounted on the top of the protective shell (501), and the output end of the first motor (513) is connected to the top of the central shaft (502).

3. The laser welding device for metal furniture frames according to claim 2, characterized in that, The swing mechanism (5) further includes: A guide frame (503) is provided, the top of which is connected to the bottom of the central shaft (502); Connecting seat (504), the connecting seat (504) is provided on one side of the top of the guide frame (503); The first connecting rod (505) is symmetrically arranged on both sides of the connecting seat (504); The deflection frame (506) has a top frame that is slidably connected to the guide frame (503) and a bottom frame that is rotatably connected to the swing block (516). The second connecting rod (507) is located on both sides of the top frame of the deflection frame (506).

4. The laser welding device for metal furniture frames according to claim 3, characterized in that, The swing mechanism (5) further includes: Synchronous frame (508), two synchronous frames (508) are symmetrically arranged on both sides of the deflection frame (506), and one end of the first connecting rod (505) is hinged to the middle of the synchronous frame (508); The first stroke groove (509) is opened on the outer wall of one end of the synchronous frame (508), and one end of the third connecting rod (512) passes through the first stroke groove (509); The second stroke groove (510) is opened on the outer wall of the other end of the synchronous frame (508), and one end of the second connecting rod (507) passes through the second stroke groove (510).

5. The laser welding device for metal furniture frames according to claim 2, characterized in that, The swing mechanism (5) further includes: A movable plate (514) is located on one side of the central shaft (502), and the top of the movable plate (514) is rotatably connected to the top of the inner wall of the protective shell (501) through a column. Electric push rod (515), the electric push rod (515) is located on the top of the protective shell (501), and the telescopic part of the electric push rod (515) is connected to the top end of the column of the moving plate (514). A floating ring (517) is disposed below the protective shell (501); Rotating frame (518), the rotating frame (518) is located below the protective shell (501), the top of the rotating frame (518) is rotatably connected to the bottom of the protective shell (501) at the corresponding position, and the bottom of the rotating frame (518) is rotatably connected to the protruding part of the side wall of the floating ring (517). The first spring (519) is located above the floating ring (517), and both ends of the first spring (519) are rotatably connected to the middle of the rotating frame (518) and the top of the floating ring (517) respectively through blocks.

6. The laser welding device for metal furniture frames according to claim 1, characterized in that, The pitch mechanism (7) further includes: Mounting plate (701), one side of which is connected to one side of the main laser head (6); Limiting grooves (702), two of the limiting grooves (702) are formed on the top of the mounting plate (701); Guide rails (703), the two guide rails (703) are respectively provided on both sides of the bottom of the mounting plate (701); The two movable seats (704) are slidably connected to the guide rails (703) at corresponding positions, and the moving plate (707) is located at the bottom of the movable seats (704).

7. The laser welding device for metal furniture frames according to claim 6, characterized in that, The pitch mechanism (7) further includes: Telescopic rod (705), one end of which passes through the outer wall of one end plate of guide rail (703), and the other end of which abuts against one side of movable seat (704); The second spring (706) is located outside the telescopic rod (705), and the two ends of the second spring (706) are respectively connected to the outer wall of one end plate of the guide rail (703) and the outer wall of one end of the telescopic rod (705). The transmission rod (708) has its bottom end connected to the top end of one end of the motion plate (707), and its top end passes through the limiting groove (702). The top end of the transmission rod (708) is connected to an extrusion block (709).

8. The laser welding device for metal furniture frames according to claim 2, characterized in that, The pitch mechanism (7) further includes: Driven wheel (710), the driven wheel (710) is sleeved on the outside of the main laser head (6); The top of the drive wheel (711) is rotatably connected to the bottom of the protective shell (501) via a column; The second motor (712) is installed at the bottom of the inner wall of the protective shell (501), and the output end of the second motor (712) is connected to the top of the top column of the drive wheel (711).

9. The laser welding device for metal furniture frames according to claim 1, characterized in that, The internal support mechanism (9) also includes: Positioning seat (901), the positioning seat (901) is embedded in the top of the sliding seat (2); First sliding groove (902), multiple first sliding grooves (902) are formed around the axis of positioning seat (901) on the outer wall of positioning seat (901); A movable shaft (905), one end of which passes through the interior of the positioning seat (901); A lead screw (903) is connected at one end to a movable shaft (905), and a handwheel (904) is connected at the other end of the lead screw (903). A fixed sleeve (909) is sleeved on the outside of the movable shaft (905), and one end of the fixed sleeve (909) is connected to one side of the positioning seat (901); Second sliding groove (910), multiple second sliding grooves (910) are formed around the axis of the fixed sleeve (909) on the outer wall of the fixed sleeve (909).

10. A laser welding device for metal furniture frames according to claim 9, characterized in that, The internal support mechanism (9) also includes: First rotating seat (906), a plurality of first rotating seats (906) are arranged around the axis of moving shaft (905) on the outer wall of moving shaft (905), and the first rotating seat (906) is arranged inside the second sliding groove (910); The second rotating seat (907) is located at the bottom of the support plate (911); Synchronous rods (908), a plurality of synchronous rods (908) are arranged around the axis of the moving shaft (905) outside the moving shaft (905), one end of the synchronous rod (908) is rotatably connected to the first rotating seat (906), and the other end of the synchronous rod (908) is rotatably connected to the second rotating seat (907); A sliding shaft (912) is provided, one end of which is connected to one side of a support plate (911), and the other end of which passes through a first sliding groove (902). A heat-conducting plate (913) is disposed on the top of a support plate (911).

Images