Welding device for forklift frame

Abstract

The invention discloses a forklift frame welding device which comprises a supporting structure, an electric hydraulic push rod, a forklift frame welding tool clamp, an all-position welding gun, a fixing device and a bending device, and the supporting structure can support operation of the whole device; the electric hydraulic push rod is arranged on the top surface of the bottom of the supporting structure close to the center; the forklift frame welding tool clamp is arranged at the pushing end of the electric hydraulic push rod, and the forklift frame welding tool clamp is matched with the electric hydraulic push rod so that the bottom of the forklift frame can be fixed and the height of the forklift frame can be adjusted; the all-position welding gun is arranged in the center of the rear end of the top face of the forklift frame welding tool clamp. The fixing device is arranged at one end of the left top of the inner wall of the supporting structure. The branch pipe can be accurately bent into a bent pipe matched with two ports needing to be welded, and the problem that the ports are not matched is fundamentally solved; and the bent pipe formed by bending is driven to be accurately aligned with the two welding ports, so that accurate positioning of the welding position is realized.

Description

Technical Field

[0001] The invention relates to the technical field of forklift frame welding, in particular to a welding device for a forklift frame. Background Art

[0002] In the forklift manufacturing industry, the frame is the core load-bearing component of the forklift, and its welding quality directly affects the overall performance and service life of the forklift. Currently, when installing and welding the bottom elbow of the forklift frame, the common method is to pre-prepare the finished elbow and then install and weld it. However, this traditional process has obvious drawbacks; Port matching issues: Due to errors in the manufacturing and installation process, the two ports of the finished elbow are often mismatched or slightly offset during installation, making it difficult to accurately align the welding position. This not only increases the difficulty of installation and welding, but also reduces the welding quality, affecting the structural strength and stability of the frame. For example, in actual production, welding misalignment caused by port offset may cause stress concentration when the frame is carrying heavy objects, shortening the service life of the forklift; Complex operation and insufficient precision: Existing welding equipment often suffers from complex operation and poor flexibility when clamping, fixing, and bending straight forklift tubes. Traditional clamping structures often rely on manual adjustment or simple mechanical structures, making it difficult to quickly and accurately bend straight tubes into the required bends, affecting bending accuracy and welding quality. For example, some devices require multiple manual adjustments to the clamping position and bending angle, which is not only inefficient but also prone to human error, resulting in the bend not meeting the required dimensions. Summary of the Invention

[0003] The object of the present invention is to provide a welding device for a forklift frame to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a welding device for a forklift frame, comprising: a supporting structure, an electric hydraulic push rod, a forklift frame welding fixture, an all-position welding gun, a fixing device and a bending device, wherein the supporting structure can support the operation of the entire device; the electric hydraulic push rod is arranged on the top surface of the bottom of the supporting structure near the center; the forklift frame welding fixture is arranged at the pushing end of the electric hydraulic push rod, and the cooperation between the forklift frame welding fixture and the electric hydraulic push rod can fix and adjust the height of the bottom of the forklift frame; the all-position welding gun is arranged at the rear end center of the top surface of the forklift frame welding fixture; the fixing device is arranged at one end of the top left side of the inner wall of the supporting structure, and the fixing device can fix the forklift straight pipe; the bending device is arranged at the other end of the top left side of the inner wall of the supporting structure, and the bending device can cooperate with the fixing device to bend the forklift straight pipe, and weld it by the all-position welding gun.

[0005] Preferably, in order to support the operation of the entire device, the supporting structure includes: a supporting platform, a supporting rod, a supporting plate, a first groove, a fixing block, an electric push rod, a cylindrical tube, a first brake motor, a right-angle fixing bracket and an infrared sensor, and the supporting platform is used as the supporting platform of the entire device; the supporting rod is arranged at the rear end of the top surface of the supporting platform near the center; the supporting plate is arranged at the left end of the top surface of the supporting platform, and a first groove running through the left and right is opened at the top rear end of the right side of the outer wall of the support plate; the fixing block is arranged at the top center in the first groove, and a part of the fixing block extends outward to the left end; the electric push rod is arranged at the bottom of one end of the fixed block extending outward; the cylindrical tube is arranged at the pushing end of the electric push rod, and the cylindrical tube is located in the center of the first groove; the first brake motor is arranged at one end in the cylindrical tube; the right-angle fixing bracket is arranged at the center of the top surface of the support plate; the infrared sensor is arranged on the bottom surface of one end of the right-angle fixing bracket.

[0006] Preferably, in order to clamp the straight pipe of the forklift frame, the fixing device includes: a concave block, a movable groove, a first chamber, a first driving assembly, a transmission rod, a movable rod and a clamping plate, the concave block is arranged at the other end of the cylindrical tube through a first bearing, the output end of the first brake motor is connected and fixed to the left center of the outer wall of the concave block, and movable grooves are provided at the upper and lower ends of the concave block groove and are staggered, a first chamber is provided in the concave block, and the two movable grooves are both connected to the first chamber; the first driving assembly is arranged at the left center of the inner wall of the first chamber; there are two transmission rods, which are respectively arranged at the two movable ends of the first driving assembly; there are two movable rods, which are respectively arranged at one end of the two transmission rods, and one end of the two movable rods is respectively embedded in the two movable grooves, and the two movable rods can be limited and moved in the two movable grooves; there are two clamping plates, which are respectively arranged at one end of the two movable rods.

[0007] Preferably, in order to drive the two clamping plates to fix the straight tube of the forklift frame, the first driving assembly includes: a first gear, a flat brake motor and a first rack, the first gear is arranged at the left center of the inner wall of the first chamber through the second bearing; the flat brake motor is arranged at the right center of the inner wall of the first chamber, and the output end of the flat brake motor is connected and fixed to one end of the first gear; there are two first racks, which are respectively arranged at the other end of the two transmission rods, and the two first racks are engaged with the first gear; the rotation of the flat brake motor causes the first gear to drive the two first racks to contract and expand, and the two moving rods are driven by the two transmission rods to move in a limited position in the two first chambers, so that the two clamping plates are close to and expanded.

[0008] Preferably, after the brake motor is started, the output shaft drives the first gear to rotate, and the first gear engages with the first racks on both sides, converting the rotational motion into linear motion, pushing the transmission rod to move in the first chamber, and the transmission rod drives the moving rod to slide in the moving groove, and finally makes the two clamping plates approach each other, clamping the forklift straight pipe through the arc contact surface.

[0009] Preferably, in order to bend the straight tube of the forklift frame, the bending device includes: a bearing block, a second groove, a second chamber, a fixed plate, a second drive assembly, a connecting column, a rotating block and an arc plate, the bearing block is arranged at the top front end of the right side of the outer wall of the support plate, a second groove is opened in the center of the right side of the outer wall of the bearing block, a second chamber is opened in the bearing block, and the second groove passes through the second chamber; the fixed plate is arranged at the top of the second chamber; the second drive assembly is arranged on the bottom surface of the fixed plate; the connecting column is arranged at the movable end of the second drive assembly, and the connecting column is embedded in the second groove; the rotating block is arranged at one end of the connecting column through the third bearing; the arc plate is arranged on the bottom surface of the rotating block.

[0010] Preferably, in order to drive the straight tube of the forklift frame to bend, the second driving assembly includes: a second rack, a slide groove, a slider, a bearing seat, a second gear and a second brake motor, the second rack is arranged on the bottom surface of the fixed plate, and slide grooves are opened on the left and right sides of the outer wall of the second rack; there are two sliders, one end of which is embedded in the two slide grooves, and the two sliders can move within the two slide grooves respectively; there are two bearing seats, one end of the two sliders; the second gear is arranged between the rotating axes of the two bearing seats, and the bearing seat and the second rack are meshed with each other; the second brake motor is arranged at the bottom of one side of the outer wall of one of the bearing seats, and the output end of the second brake motor is connected and fixed to one end of the second gear, and the rotation of the second brake motor causes the second gear to move on the tooth surface of the second rack, and the two sliders are driven to move within the two slide grooves through the two bearing seats, thereby driving the arc plate to move through the connecting column.

[0011] Preferably, when driven for horizontal movement, after the second brake motor is started, it drives the second gear to roll on the second rack, and through the linkage between the bearing seat and the slider, the connecting column moves horizontally in the second groove.

[0012] Preferably, during bending, the connecting column drives the curved plate to contact the straight tube. As the curved plate moves toward the fixture, the straight tube is squeezed between the curved plate and the clamping plate, forming a bend. The curvature radius of the curved plate is prefabricated according to welding requirements to ensure that the curvature of the bend matches the frame port.

[0013] Collaborative Workflow: Initial state: the forklift frame is fixed to the fixture, and the straight pipe is placed between the clamping plate and the curved plate; Data collection: Infrared sensors scan the frame ports to generate bending parameters; Straight pipe processing: the flat brake motor drives the clamping plate to clamp the straight pipe, and the second brake motor drives the curved plate to bend the straight pipe to the target curvature; Position calibration: The electric hydraulic push rod adjusts the frame height, and the electric push rod cooperates with the first brake motor to adjust the position and angle of the bend; Welding completed: All-position welding guns automatically complete port welding, and the device resets to wait for the next operation Compared with the prior art, the present invention has the following beneficial effects: 1. Improve welding accuracy: The infrared sensor installed in the device can accurately sense and scan the two ports that need to be welded at the bottom of the forklift frame, and transmit the data information to the fixing device and bending device. Based on this, the branch pipe can be accurately bent into a bend that matches the two ports to be welded, solving the problem of port mismatch from the root. The infrared sensor can also transmit the sensing data to the electric push rod, driving the bent bend to accurately align with the two welding ports. This process realizes the precise positioning of the welding position, greatly improving the accuracy of forklift frame welding.

[0014] 2. Improved Welding Convenience: A flat brake motor in the fixture, driven by the first gear and the first rack, moves the clamping plates toward and apart, conveniently clamping and securing the forklift straight tube. This highly automated drive eliminates the need for tedious manual operation; simply starting the motor completes clamping, significantly improving operational convenience. A second brake motor in the bending mechanism drives the second gear on the second rack, moving the curved plate and bending the straight tube. During the bending process, the curved plate rotates according to the tube's bend, offsetting rotational forces via the third bearing, making the bending operation smoother and more flexible. The entire bending process is completed automatically without manual intervention, significantly improving the convenience of forklift frame welding and shortening production cycles.

[0015] 3. Guarantee welding quality: Precise port matching and alignment ensure the accuracy of welding position, avoid problems such as cold welding and leaking welding caused by port deviation, thereby improving welding quality; the strength of the frame structure after welding is more uniform, which can better withstand heavy loads and extend the service life of the forklift; automated clamping and bending operations reduce the impact of human factors on welding quality, making the welding process more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the support structure of the present invention; Figure 3 for Figure 2 A in the figure shows the enlarged structural diagram; Figure 4 Schematic diagram of the cross-sectional structure of a cylindrical tube of the support structure of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the fixing device of the present invention; Figure 6 Schematic diagram of the cross-sectional structure of the concave block of the fixing device of the present invention; Figure 7 This is a schematic structural diagram of the flat brake motor connection assembly of the fixing device of the present invention; Figure 8 This is a schematic diagram of the exploded structure of the first gear connecting assembly of the fixing device of the present invention; Figure 9 This is a schematic structural diagram of the transmission rod connection assembly of the fixing device of the present invention; Figure 10 It is a schematic structural diagram of the bending device of the present invention; Figure 11 for Figure 10 A schematic diagram of the structure at point B is enlarged; Figure 12 This is a schematic diagram of the structure of the bearing block of the bending device of the present invention; Figure 13 Schematic diagram of the cross-sectional structure of the bearing block of the bending device of the present invention; Figure 14 for Figure 13 The enlarged structural diagram at C in FIG. Figure 15 This is a schematic diagram of the exploded structure of the fixed plate connection assembly of the bending device of the present invention; Figure 16 This is a schematic diagram of the exploded structure of the second gear connecting assembly of the bending device of the present invention.

[0017] Figure: 1, support structure; 2, electric hydraulic push rod; 3, forklift frame welding fixture; 4, all-position welding gun; 5, fixing device; 6, bending device; 11, support platform; 12, support rod; 13, support plate; 14, first groove; 15, fixing block; 16, electric push rod; 17, cylinder; 18, first brake motor; 19, right-angle fixing bracket; 110, infrared sensor; 51, concave block; 52, movable slot; 5 3. First chamber; 54. First gear; 55. Flat brake motor; 56. First rack; 57. Transmission rod; 58. Moving rod; 59. Clamping plate; 61. Carrying block; 62. Second groove; 63. Second chamber; 64. Fixed plate; 65. Second rack; 66. Slide groove; 67. Slider; 68. Bearing seat; 69. Second gear; 610. Second brake motor; 611. Connecting column; 612. Rotating block; 613. Arc plate. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figures 1-16 The present invention provides a technical solution for a welding device for a forklift frame, comprising: a support structure 1, an electric hydraulic push rod 2, a forklift frame welding fixture 3, an all-position welding torch 4, a fixing device 5 and a bending device 6. The support structure 1 can support the operation of the entire device, and the support structure 1 has a certain supporting force; the electric hydraulic push rod 2 is arranged on the top surface of the bottom of the support structure 1 near the center; the forklift frame welding fixture 3 is arranged at the pushing end of the electric hydraulic push rod 2, and the cooperation of the forklift frame welding fixture 3 and the electric hydraulic push rod 2 can fix and adjust the height of the bottom of the forklift frame; the all-position welding torch The gun 4 is arranged at the rear end center of the top surface of the forklift frame welding fixture 3, and the all-position welding gun 4 can weld the two welding ends of the forklift; the fixing device 5 is arranged at one end of the top left side of the inner wall of the supporting structure 1, and the fixing device 5 can fix the straight pipe of the forklift, and the fixing device 5 can also adjust and move the angle of the bent pipe; the bending device 6 is arranged at the other end of the top left side of the inner wall of the supporting structure 1, and the bending device 6 can cooperate with the fixing device 5 to bend the straight pipe of the forklift, and welding is performed by the all-position welding gun 4. The present invention improves the convenience and accuracy of forklift frame welding.

[0020] As a preferred solution, further, Figure 2 、 Figure 3 and Figure 4 , as shown, the support structure 1 includes: a support platform 11, a support rod 12, a support plate 13, a first groove 14, a fixed block 15, an electric push rod 16, a cylinder 17, a first brake motor 18, a right-angle fixing bracket 19 and an infrared sensor 110. The support platform 11 is used as a support platform for the entire device, and the support platform 11 has a certain supporting force; the support rod 12 is arranged at the rear end of the top surface of the support platform 11 near the center, and the support rod 12 is used to support the full-position welding gun 4; the support plate 13 is arranged at the left end of the top surface of the support platform 11, and the top rear end of the right side of the outer wall of the support plate 13 is provided with a first groove 14 that runs through the left and right sides, and the support plate 13 has a certain supporting force for the fixing device 5 and the bending device 6; the fixed block 15 is arranged at the top center in the first groove 14, and the fixed block 15 extends a part outward to the left end, and the fixed block 15 has a fixed supporting function for the electric push rod 16; the electric push rod 16 is arranged at the bottom of one end of the fixed block 15 extending outward, and the electric push rod 16 is used to extend and retract the fixing device 5; the cylindrical tube 17 is arranged at the pushing end of the electric push rod 16, and the cylindrical tube 17 is located in the center of the first groove 14. The interior of the cylindrical tube 17 is hollow, leaving a certain space for the first brake motor 18 to operate; the first brake motor 18 is arranged at one end of the cylindrical tube 17, and the first brake motor 18 has a self-locking ability, which can make the output end connection component run smoothly; the right-angle fixing bracket 19 is arranged at the center of the top surface of the support plate 13, and the right-angle fixing bracket 19 has a certain supporting effect on the infrared sensor 110; the infrared sensor 110 is arranged on the bottom surface of one end of the right-angle fixing bracket 19, and the infrared sensor 110 can sense and scan the two ports that need to be welded at the bottom of the forklift frame, thereby sensing and driving the fixing device 5 and the bending device 6 to cooperate with each other to bend the branch pipe into a bend that matches the two ports that need to be welded, and the infrared sensor 110 can also sense the electric push rod 16, thereby driving the bent bend to align with the two welding ports.

[0021] As a preferred solution, further, Figure 5 、 Figure 6 and Figure 9As shown, the fixing device 5 includes: a concave block 51, a movable groove 52, a first chamber 53, a first driving assembly, a transmission rod 57, a movable rod 58 and a clamping plate 59. The concave block 51 is arranged at the other end of the cylindrical tube 17 through a first bearing. The concave block 51 can rotate through the first bearing. The output end of the first brake motor 18 is connected and fixed to the left center of the outer wall of the concave block 51, and the first brake motor 18 can drive the concave block 51 to rotate. The upper and lower ends of the groove of the concave block 51 are provided with movable grooves 52 in an interlaced manner. The concave block 51 is provided with a first chamber 53, and the two movable grooves 52 are both connected to the first chamber 53; the first driving assembly is provided At the left center of the inner wall of the first chamber 53; there are two transmission rods 57, which are respectively arranged at the two moving ends of the first drive assembly, and the transmission rod 57 is used for transmission between the first rack 56 and the moving rod 58; there are two moving rods 58, which are respectively arranged at one end of the two transmission rods 57, and one end of the two moving rods 58 is respectively embedded in the two moving grooves 52, and the two moving rods 58 can respectively move within the two moving grooves 52; there are two clamping plates 59, which are respectively arranged at one end of the two moving rods 58. The two clamping plates 59 are designed to be arc-shaped to fit the shape of the forklift straight pipe, and the two clamping plates 59 can better fix the forklift straight pipe.

[0022] As a preferred solution, further, Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the first driving assembly includes: a first gear 54, a flat brake motor 55 and a first rack 56. The first gear 54 is arranged at the left center of the inner wall of the first chamber 53 through the second bearing, and the first gear 54 can rotate through the second bearing; the flat brake motor 55 is arranged at the right center of the inner wall of the first chamber 53, and the output end of the flat brake motor 55 is connected and fixed to one end of the first gear 54. The flat brake motor 55 has a certain self-locking effect, and the flat brake motor 55 occupies a small area; there are two first racks 56, which are respectively arranged at the other end of the two transmission rods 57. The two first racks 5 6 are meshed with the first gear 54. The cooperation of the two moving grooves 52, the two moving rods 58 and the first gear 54 has a limiting and fixing effect on the two first racks 56. The flat brake motor 55 rotates to make the first gear 54 drive the two first racks 56 to contract and expand, and drives the two moving rods 58 to move in the two first chambers 53 respectively through the two transmission rods 57, so that the two clamping plates 59 approach and expand each other. This drive assembly converts the rotational motion of the first gear 54 into the linear motion of the two first racks 56 through the meshing of the tooth surfaces, so that the two clamping plates 59 clamp and fix the straight tube.

[0023] As a preferred solution, further, Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 , Figure 14 、 Figure 15 and Figure 16 As shown, the bending device 6 includes: a bearing block 61, a second groove 62, a second chamber 63, a fixing plate 64, a second driving assembly, a connecting column 611, a rotating block 612 and an arc plate 613. The bearing block 61 is arranged at the top front end of the right side of the outer wall of the support plate 13. A second groove 62 is provided at the center of the right side of the outer wall of the bearing block 61. A second chamber 63 is provided in the bearing block 61, and the second groove 62 passes through the second chamber 63; the fixing plate 64 is arranged at the top of the second chamber 63, and the fixing plate 64 has a fixing effect on the second driving assembly, and the fixing plate 64 has a certain bearing capacity; the second driving assembly is arranged on the bottom surface of the fixing plate 64; the connecting column 611 is provided with a second groove 62, and the second chamber 63 is provided in the bearing block 61. The connecting column 611 is arranged at the movable end of the second driving component, the connecting column 611 is embedded in the second groove 62, and the connecting column 611 can be limited and moved in the second groove 62; the rotating block 612 is arranged at one end of the connecting column 611 through the third bearing, and the rotating block 612 can rotate through the third bearing; the arc plate 613 is arranged on the bottom surface of the rotating block 612, and the arc plate 613 fits the shape of the straight pipe and can better cooperate during the bending process of the straight pipe. When the two clamping plates 59 clamp the fixed straight pipe and the arc plate 613 is driven by the second brake motor 610 to contact the straight pipe, the arc plate 613 and the upper end clamping plate 59 are on the same horizontal line.

[0024] As a preferred solution, further, Figure 13 , Figure 14 、 Figure 15 and Figure 16As shown, the second driving assembly includes: a second rack 65, a slide 66, a slider 67, a bearing seat 68, a second gear 69 and a second brake motor 610. The second rack 65 is arranged on the bottom surface of the fixed plate 64, and slide slots 66 are provided on the left and right sides of the outer wall of the second rack 65; there are two sliders 67, which are respectively embedded in one end of the two slide slots 66, and the two sliders 67 can respectively move along the two slide slots 66. The sliders 67 are made of wear-resistant material and extend the service life of the equipment; there are two bearing seats 68, which are respectively arranged at one end of the two sliders 67; the second gear 69 is arranged between the rotating axes of the two bearing seats 68, and the bearing seats 68 and the second rack 65 are meshed with each other; the second The brake motor 610 is arranged at the bottom of one side of the outer wall of one of the bearing seats 68. The output end of the second brake motor 610 is fixedly connected to one end of the second gear 69. The second brake motor 610 has a certain self-locking ability, so that its output end connecting component operates smoothly. The second brake motor 610 rotates to move the second gear 69 on the tooth surface of the second rack 65, and drives the two sliders 67 to move in the two slide grooves 66 through the two bearing seats 68, thereby driving the arc plate 613 to move through the connecting column 611. When the arc plate 613 drives the straight tube to bend, the arc plate 613 will rotate according to the bending of the straight tube to offset the rotational force through the third bearing, and complete the transformation from a straight tube to a bent tube.

[0025] When installing the bent pipes at the bottom of the forklift frame, the finished bent pipes are installed, which often causes the two installed ports to be mismatched or slightly offset. Therefore, this device can more accurately identify the two welding ports, thereby more accurately installing and welding. The bottom of the forklift frame is fixed by the forklift frame welding fixture 3, and the height of the bottom of the forklift frame is adjusted by the electric hydraulic push rod 2. One end of the straight pipe to be bent is placed in the clamping plate 59 at the bottom, and the flat brake motor 55 drives the two clamping plates 59 to clamp and fix one end of the straight pipe, and the straight pipe is fixed. The other end is located directly below the arc plate 613, and the second brake motor 610 drives the arc plate 613 to move and contact the other end of the straight pipe, and the two welding ends at the bottom of the forklift frame are identified and sensed by the infrared sensor 110, thereby sensing the second brake motor 610 to drive the arc plate 613 to bend the straight pipe into a curved pipe that matches the two welding end points, and the angle of the curved pipe is adjusted and moved through the cooperation of the electric push rod 16 and the first brake motor 18, so that welding is performed through the all-position welding gun 4, and the present invention can more accurately improve the welding quality.

[0026] The workflow is as follows: The bottom of the forklift frame is fixed by a forklift frame welding fixture 3, which is installed on the pushing end of the electric hydraulic push rod 2; the fixture is provided with an anti-slip groove and an adjustable pressure plate inside, which fixes the bottom of the frame by mechanical bite to avoid displacement during welding.

[0027] After receiving the control system signal, the electric hydraulic push rod 2 pushes the piston rod to extend and retract through the reciprocating motion of the hydraulic oil, driving the tooling fixture 3 to move up and down; for example, when the infrared sensor 110 detects the height deviation of the frame welding port, it will feed back the data to the external controller, and the controller will drive the electric hydraulic push rod 2 to adjust the fixture height so that the frame welding port and the welding gun 4 maintain the optimal welding distance.

[0028] To clamp and secure the straight pipe: After the flat brake motor 55 is activated, its output shaft rotates the first gear 54. The first gear 54 meshes with the first racks 56 on either side, converting rotational motion into linear motion, pushing the transmission rod 57 within the first chamber 53. The transmission rod 57 then drives the moving rod 58 to slide within the moving groove 52, ultimately bringing the two clamping plates 59 closer together, clamping the forklift straight pipe through the curved contact surface. The clamping force is determined by the torque of the flat brake motor 55, and can be adjusted to a range of 0.5-2 kN by adjusting the motor current.

[0029] Angle Adjustment Mechanism: First brake motor 18 is installed within cylindrical barrel 17, with its output shaft fixedly connected to concave block 51. When the straight tube angle needs to be adjusted, first brake motor 18 drives concave block 51 to rotate about the axis of cylindrical barrel 17, driving the clamped straight tube to rotate synchronously, achieving 0-360° angle adjustment to meet different bending angle requirements.

[0030] Principle of straight tube bending: The bending device 6 realizes straight tube bending through the cooperation of the second brake motor 610 and the arc plate 613; after the second brake motor 610 is started, it drives the second gear 69 to roll on the second rack 65, and through the linkage of the bearing seat 68 and the slider 67, the connecting column 611 moves horizontally in the second groove 62; the connecting column 611 drives the arc plate 613 to contact the straight tube. When the arc plate 613 moves toward the fixing device 5, the straight tube is squeezed between the arc plate 613 and the clamping plate 59 to form a bend; the curvature radius of the arc plate 613 can be prefabricated according to welding requirements to ensure that the curvature of the bend matches the frame port.

[0031] The curved plate 613 is connected to the connecting column 611 through a third bearing. When the straight tube bends and generates rotational force, the third bearing allows the curved plate 613 to rotate, offsetting the reaction force and preventing the straight tube from being deformed or broken due to stress concentration. At the same time, the sliding fit of the slider 67 in the slide groove 66 is equipped with a damper, which can control the bending speed and ensure the bending accuracy.

[0032] Precise welding positioning: The infrared sensor 110 at the bottom of the right-angle fixing bracket 19 emits an infrared beam to scan the two ports to be welded at the bottom of the frame, and obtains the three-dimensional coordinates of the ports (X, Y, Z axis position and inclination angle); the infrared sensor 110 transmits the data to the controller, which calculates the curvature, length and installation angle of the required bend, and generates a control signal to drive the fixing device 5 and the bending device 6.

[0033] The electric push rod 16 at the bottom of the fixed block 15 extends and retracts according to the controller's instructions, driving the cylindrical tube 17 and the clamped elbow to move. For example, when the sensor detects that the frame port is offset by 5mm, the electric push rod (16) will push the elbow to move 5mm laterally, so that the two ends of the elbow are accurately aligned with the frame port (error ≤ 0.5mm); at the same time, the first brake motor 18 cooperates to adjust the angle of the elbow to ensure that the port axis coincides.

[0034] The all-position welding torch 4 is mounted on the rear end of the top surface of the fixture 3 and fixed by a support rod 12. The torch can achieve 360° rotation and pitch adjustment, automatically adjusting the welding angle in accordance with the position of the frame port; when the elbow is aligned with the frame port, the torch 4 starts welding.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for a forklift frame, characterized in that: include: A supporting structure (1) capable of supporting the operation of the entire device; An electric hydraulic push rod (2) is arranged on the top surface of the bottom of the support structure (1) near the center; A forklift frame welding fixture (3) is provided at the pushing end of the electric hydraulic push rod (2); the forklift frame welding fixture (3) cooperates with the electric hydraulic push rod (2) to fix and adjust the height of the bottom of the forklift frame; An all-position welding gun (4) is arranged at the center of the rear end of the top surface of the forklift frame welding fixture (3); A fixing device (5) is provided at one end of the top left side of the inner wall of the support structure (1), and the fixing device (5) is capable of fixing the forklift straight pipe; A bending device (6) is provided at the other end of the top left side of the inner wall of the support structure (1). The bending device (6) can cooperate with the fixing device (5) to bend the forklift straight pipe, and is welded by an all-position welding torch (4).

2. A welding device for a forklift frame according to claim 1, characterized in that: The support structure (1) comprises: A supporting platform (11), used as a supporting platform for the entire device; A support rod (12) is arranged at the rear end of the top surface of the support platform (11) close to the center; A support plate (13) is provided at the left end of the top surface of the support platform (11), and a first groove (14) is provided at the top rear end of the right side of the outer wall of the support plate (13); A fixing block (15) is disposed at the top center of the first groove (14), and a portion of the fixing block (15) extends outward toward the left end; An electric push rod (16) is arranged at the bottom of one end of the fixed block (15) extending outward; A cylindrical barrel (17) is arranged at the pushing end of the electric push rod (16), and the cylindrical barrel (17) is located at the center of the first groove (14); a first brake motor (18) disposed at one end of the cylindrical barrel (17); A right-angle fixing bracket (19) is arranged at the center of the top surface of the support plate (13); An infrared sensor (110) is arranged on the bottom surface of one end of the right-angle fixing bracket (19).

3. A welding device for a forklift frame according to claim 2, characterized in that: The fixing device (5) comprises: A concave block (51) is arranged at the other end of the cylindrical tube (17) through a first bearing, and the output end of the first brake motor (18) is fixedly connected to the left center of the outer wall of the concave block (51). The upper and lower ends of the groove of the concave block (51) are provided with movable grooves (52) in an interlaced manner. A first chamber (53) is provided in the concave block (51), and the two movable grooves (52) are both connected to the first chamber (53); A first driving assembly is arranged at the left center of the inner wall of the first chamber (53); There are two transmission rods (57), which are respectively arranged at the two moving ends of the first driving assembly; There are two moving rods (58), which are respectively arranged at one end of the two transmission rods (57), one end of the two moving rods (58) is respectively embedded in the two moving grooves (52), and the two moving rods (58) can respectively move within the two moving grooves (52) within a limited position; There are two clamping plates (59), which are respectively arranged at one end of the two moving rods (58).

4. A welding device for a forklift frame according to claim 3, characterized in that: The first drive assembly comprises: A first gear (54) is disposed at the left center of the inner wall of the first chamber (53) via a second bearing; A flat brake motor (55) is arranged at the center of the right side of the inner wall of the first chamber (53), and the output end of the flat brake motor (55) is connected and fixed to one end of the first gear (54); There are two first racks (56) respectively arranged at the other end of the two transmission rods (57), and the two first racks (56) are meshed with the first gear (54); the flat brake motor (55) rotates to cause the first gear (54) to drive the two first racks (56) to contract and expand, and the two moving rods (58) are driven by the two transmission rods (57) to move within the two first chambers (53) respectively, so that the two clamping plates (59) are close to and expanded.

5. The welding device for a forklift frame according to claim 4, characterized in that: After the brake motor (55) is started, the output shaft drives the first gear (54) to rotate, and the first gear (54) engages with the first racks (56) on both sides to convert the rotational motion into linear motion, pushing the transmission rod (57) to move in the first chamber (53), and the transmission rod (57) drives the moving rod (58) to slide in the moving groove (52), and finally the two clamping plates (59) are brought close to each other, clamping the forklift straight pipe through the arc contact surface.

6. The welding device for a forklift frame according to claim 5, characterized in that: The bending device (6) comprises: A bearing block (61) is arranged at the top front end of the right side of the outer wall of the support plate (13); a second groove (62) is opened at the center of the right side of the outer wall of the bearing block (61); a second chamber (63) is opened in the bearing block (61), and the second groove (62) passes through the second chamber (63); a fixed plate (64) disposed on the top of the second chamber (63); a second driving assembly, disposed on the bottom surface of the fixing plate (64); A connecting post (611) is provided at the moving end of the second driving assembly, and the connecting post (611) is embedded in the second groove (62); A rotating block (612) is arranged at one end of the connecting column (611) via a third bearing; The arc-shaped plate (613) is arranged on the bottom surface of the rotating block (612).

7. The welding device for a forklift frame according to claim 6, characterized in that: The second drive assembly includes: A second rack (65) is provided on the bottom surface of the fixed plate (64), and a sliding groove (66) is provided on both left and right sides of the outer wall of the second rack (65); There are two sliders (67), each of which is embedded in one end of the two slide grooves (66), and the two sliders (67) can move within the two slide grooves (66) within a limited position. Two bearing seats (68) are provided at one end of each of the two sliders (67); a second gear (69) disposed between the rotating shafts of the two bearing seats (68), wherein the bearing seats (68) and the second rack (65) are meshed with each other; The second brake motor (610) is arranged at the bottom of one side of the outer wall of one of the bearing seats (68), and the output end of the second brake motor (610) is fixedly connected to one end of the second gear (69). The second brake motor (610) rotates to move the second gear (69) on the tooth surface of the second rack (65), and drives the two sliders (67) to move in the two slide grooves (66) through the two bearing seats (68), thereby driving the arc plate (613) to move through the connecting column (611).

8. The welding device for a forklift frame according to claim 7, characterized in that: When driven for horizontal movement, after the second brake motor (610) is started, it drives the second gear (69) to roll on the second rack (65), and through the linkage of the bearing seat (68) and the slider (67), the connecting column (611) moves horizontally in the second groove (62).

9. The welding device for a forklift frame according to claim 8, characterized in that: During bending, the connecting column (611) drives the curved plate (613) to contact the straight tube. When the curved plate (613) moves toward the fixing device (5), the straight tube is squeezed between the curved plate (613) and the clamping plate (59), forming a bend. The curvature radius of the curved plate (613) is prefabricated according to welding requirements to ensure that the curvature of the bent tube matches the frame port.

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