An automatic welding device for conveyor drums

Abstract

The present application relates to the field of welding equipment, specifically is a conveyor cylinder automatic welding device, including the placement frame for bearing cylinder body and two manipulators, the execution end of manipulator is provided with the alignment mechanism and the heat resistance mechanism through the base cylinder, the alignment mechanism is used for the alignment cylinder body and the dish axis, the present application adopts the synchronous control each moving seat radial movement of the autorotation platform, makes the roller synchronous abuts at the outside of cylinder body, drives the roller rotation through the direct drive motor again, thereby drives the steady rotation of cylinder body, simultaneously utilizes the force sensor integrated between the roller and the moving seat, the dynamic balance change data in the cylinder body rotation process is monitored in real time and is transmitted to the microcomputer, the microcomputer controls the moving of the resistance block of the clamping dish axis according to the dynamic balance data, namely through the opposite extension of the extension section of two hydraulic cylinders to push the dish axis adjustment position, realizes the accurate coaxial alignment of the dish axis and the actual rotation axis of cylinder body.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, specifically an automatic welding device for conveyor rollers. Background Technology

[0002] The conveyor roller is the core drive and load-bearing component of a belt conveyor. Its structure typically includes an annular cylindrical body and a rotating shaft (i.e., receiving plate shaft) with receiving plates at both ends. During assembly, the rotating shaft is installed inside the cylindrical body. The outer circumferential surface of the receiving plate is required to be coaxially arranged with the inner wall of the cylindrical body. By welding the circumferential seam where the receiving plate contacts the cylindrical body, the two can be fixed together as one, thus forming an integral roller structure that can transmit torque.

[0003] Currently, automated devices for circumferential welding of the receiving plate and the cylinder body typically include a tooling frame, a rotary drive mechanism, and a robotic arm equipped with a welding torch. Before welding, the operator must place the cylinder body on the support rollers of the tooling frame and clamp and fix the receiving plate shaft to be welded using clamps such as centers or chucks to ensure that the axis of the receiving plate shaft is theoretically coaxial with the central axis of the cylinder body. Subsequently, spot welding is usually used to temporarily fix the receiving plate and the cylinder body together to form a preliminary connection. After the spot welding is completed, the rotary drive mechanism is started to rotate the entire cylinder around its axis. At the same time, the robotic arm extends the welding torch into the cylinder and aligns it with the weld position. During the rotation of the cylinder, the continuous full welding operation of the entire circumferential seam is completed.

[0004] However, the existing welding methods have the following shortcomings in practical applications: First, the existing process follows the operation sequence of spot welding followed by full welding. The spot welding position will undergo secondary heating and remelting in the subsequent full welding process. This repeated heat input will cause defects such as coarse grains and uneven mechanical properties in the weld structure of the spot welding area, thereby reducing the overall strength and fatigue life of the welded joint and affecting the long-term operational reliability of the roller.

[0005] Secondly, the existing tooling frame relies on mechanical coordination to ensure the coaxial positioning of the cylinder body and the receiving shaft. It only ensures that the geometric theoretical axis coincides, without considering the dynamic balance deviation caused by the uneven distribution of the cylinder body material. This results in the actual rotation axis being offset from the theoretical axis. This coaxial alignment error directly causes dynamic mass eccentricity after the roller is welded, which leads to severe vibration and noise during high-speed operation and affects the stability of operation.

[0006] Third, during continuous full welding, a large amount of heat generated during welding will be continuously conducted and accumulated along the metal material of the cylinder. Since welding is carried out gradually along the circumference, there is a significant difference in the thermal environment between the initial welding position and the later welding position. In the initial stage, the overall temperature of the cylinder is relatively low, but as welding progresses, the temperature of the cylinder continues to rise, which leads to changes in the cooling rate of the weld and the microstructure of the heat-affected zone. The existing process can only rely on natural ventilation and environmental radiation to alleviate the heat accumulation problem. The cooling efficiency is low and cannot be actively controlled. The uncontrollable changes in the temperature field restrict the stability and consistency of the weld quality. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic welding device for conveyor rollers, including a placement frame for supporting the roller body and two robotic arms. The execution end of the robotic arms is provided with an alignment mechanism and a heat-insulating mechanism through the base cylinder. The alignment mechanism is used to align the roller body and the receiving shaft, and the heat-insulating mechanism is used to cool the roller body.

[0008] The alignment mechanism includes a frame that rotates on the base cylinder, a plurality of roller assemblies that slide radially on the frame, the plurality of roller assemblies being arranged at equal intervals along the circumference of the frame, a drive assembly for driving the frame to rotate being provided on both the frame and the base cylinder, and a moving assembly for adjusting the position of the receiving plate shaft being provided on the base cylinder.

[0009] Before welding, the roller assembly lifts and rotates the cylinder body, monitors the dynamic balance of the cylinder body in real time, and transmits the data to the microcomputer. The microcomputer controls the moving component to drive the receiving plate shaft to the axis position of the cylinder body according to the dynamic balance data.

[0010] The heat-insulating mechanism includes an air-blowing assembly and an arc-shaped aerosol nozzle connected to the cylinder frame via an adjustment component, and a welding torch is connected to the adjustment component.

[0011] During welding, the drive assembly drives the welding torch along the weld seam via the cylinder frame and the adjustment assembly. At the same time, the adjustment assembly drives the air blowing assembly and the arc-shaped air mist nozzle to cool the area outside the weld point.

[0012] The cylinder body and the receiving plate shaft are welded by using dynamic balancing coaxial positioning, rotating the welding gun along the seam, and cooling the welding point outside the position.

[0013] Preferably, the roller assembly includes a movable seat that is radially slidably connected to the cylinder frame, a roller that is rotatably connected to the movable seat, and a force sensor integrated between the roller and the movable seat.

[0014] Preferably, a direct drive motor for driving the roller is fixedly installed on the side of the movable seat away from the roller.

[0015] Preferably, a rotating platform is rotatably mounted on the cylindrical frame, and the rotating platform is hinged to each movable seat through several connecting plates.

[0016] Preferably, the drive assembly includes a geared motor fixedly installed on the outside of the base cylinder, and the geared motor drives the cylinder frame to rotate through a synchronous belt drive structure.

[0017] Preferably, the moving component includes two symmetrically arranged hydraulic cylinders fixedly installed on the outside of the base cylinder, and the telescopic section of the hydraulic cylinders is fixedly installed with abutments for clamping the receiving disc shaft.

[0018] Preferably, when the cylinder body rotates relative to the receiving shaft, the abutment is clamped on the outside of the receiving shaft, and the receiving shaft is moved to the coaxial position of the cylinder body by the telescopic sections of the two hydraulic cylinders that extend and retract in opposite directions.

[0019] Preferably, the adjustment assembly includes an automatic telescopic arm fixedly installed on the outside of the cylinder frame, a support rod slidably connected to the automatic telescopic arm along the cylinder axial direction, and the end of the support rod being fixedly connected to the welding torch.

[0020] Preferably, the air blowing assembly includes two sets of pipes fixedly connected to the end of the support rod. Each set of pipes includes an air outlet pipe and an air intake pipe. The outlet pipe and the intake pipe in the same set are arranged opposite to each other, and the outlet pipe faces away from the welding gun.

[0021] Preferably, the arc-shaped aerosol nozzle is fixedly connected to the automatic telescopic arm, and the arc-shaped aerosol nozzle is provided with two sets of atomizing nozzles, which correspond to two sets of air outlet pipes and air inlet pipes, respectively.

[0022] The beneficial effects of this invention are as follows: First, before welding, the invention uses a robotic arm to lift and rotate the cylinder body via a roller assembly, monitors the dynamic balance of the cylinder body in real time, and transmits the data to a microcomputer. The microcomputer controls the moving assembly to move the receiving plate shaft to the actual axial position of the cylinder body based on the dynamic balance data. During welding, the welding torch is rotated along the weld seam via the cylinder frame through the driving assembly, realizing direct full welding without spot welding. At the same time, the air blowing assembly and the arc-shaped air mist nozzle, which move synchronously with the welding torch, actively cool the outer part of the weld point, effectively limiting heat conduction and alleviating heat accumulation, thereby improving the stability and consistency of welding quality.

[0023] II. This invention employs a self-rotating platform to synchronously control the radial movement of each moving seat, causing the rollers to synchronously abut against the outer side of the cylinder body. Then, a direct-drive motor drives the rollers to rotate, thereby causing the cylinder body to rotate smoothly. Simultaneously, a force sensor integrated between the rollers and the moving seat monitors the dynamic balance changes during the cylinder body's rotation in real time and transmits the data to a microcomputer. Based on this dynamic balance data, the microcomputer controls the movement of the abutment block holding the receiving plate shaft. That is, by controlling the counter-clockwise extension and retraction of the telescopic sections of two hydraulic cylinders, the receiving plate shaft is pushed to adjust its position, achieving precise coaxial alignment between the receiving plate shaft and the actual rotation axis of the cylinder body.

[0024] Third, this invention uses a robotic arm to place the cylinder body on the placement frame, so that during the formal welding process, the cylinder body and the receiving plate shaft themselves remain stationary and do not rotate. Instead, the cylinder frame on the base cylinder is driven to rotate by a geared motor, which in turn drives the welding torch to rotate circumferentially along the circumferential seam between the cylinder body and the receiving plate through an automatic telescopic arm. This enables the process operation of full welding directly without spot welding fixation, eliminating the potential quality problems of the welded joint caused by spot welding.

[0025] Fourth, this invention employs an exhaust pipe that rotates synchronously with the cylinder frame to perform directional air blowing for active cooling of the inner side of the cylinder and the area on both sides of the weld point; and an arc-shaped mist nozzle to perform atomized spraying for active cooling of the outer side of the cylinder and the area on both sides of the weld point. The combined effect of the internal and external components effectively limits the conduction of welding heat along the cylinder, alleviating the problem of uneven temperature field caused by heat accumulation. In addition, the suction pipe arranged in the same group as the exhaust pipe can quickly draw in the high-temperature gas generated inside the cylinder due to welding, further enhancing the cooling effect and improving the working environment. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the placement frame, base cylinder, cylinder frame and adjustment assembly in this invention;

[0029] Figure 3 This is a schematic diagram of the structure of the frame, base cylinder, automatic telescopic arm and air blowing assembly in this invention;

[0030] Figure 4 This is a schematic diagram of the structure of the self-rotating platform, the moving base, the welding torch, and the hydraulic cylinder in this invention;

[0031] Figure 5 This is a partial sectional view of the frame, base cylinder, rotating platform, and connecting plate in this invention;

[0032] Figure 6 This is a partial cross-sectional view of the two abutment blocks clamping and limiting the disk shaft in this invention;

[0033] Figure 7 This is a schematic diagram of the structure of the arc-shaped aerosol nozzle, welding torch, automatic telescopic arm, and support rod in this invention.

[0034] In the diagram: 1. Placement frame; 2. Robotic arm; 3. Base cylinder; 4. Alignment mechanism; 5. Heat insulation mechanism; 41. Cylinder frame; 42. Roller assembly; 43. Drive assembly; 44. Moving assembly; 51. Adjustment assembly; 52. Air blowing assembly; 53. Arc-shaped aerosol nozzle; 54. Welding torch; 411. Rotating platform; 412. Connecting plate; 421. Moving seat; 422. Roller; 423. Direct drive motor; 431. Gear motor; 441. Hydraulic cylinder; 442. Stop block; 511. Automatic telescopic arm; 512. Support rod; 521. Air outlet pipe; 522. Air suction pipe. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0036] See Figure 1 and Figure 2 An automatic welding device for conveyor rollers includes a placement frame 1 for supporting the roller body and two robotic arms 2. The execution end of the robotic arms 2 is provided with an alignment mechanism 4 for aligning the roller body and the receiving shaft through a base cylinder 3, and a heat-insulating mechanism 5 for cooling the roller body.

[0037] Before welding, the operator places the receiving shaft inside the cylinder. Then, the robot arm 2, through the base cylinder 3, drives the alignment mechanism 4 to grab the cylinder and the receiving shaft placed on the placement frame 1, and lifts the cylinder and the receiving shaft away from the placement frame 1. Then, the alignment mechanism 4 rotates the cylinder and obtains the dynamic balance data of the cylinder. Afterwards, the microcomputer adjusts the receiving shaft to the actual coaxial position of the cylinder based on the dynamic balance data, thereby achieving high-precision coaxial alignment and avoiding vibration and noise in the roller after welding, which would affect its service life.

[0038] After the receiving shaft and the cylinder body are aligned coaxially, the robot arm 2 places the aligned cylinder body on the placement frame 1 again through the base cylinder 3 and the alignment mechanism 4. Then, the alignment mechanism 4 realizes the circumferential welding of the receiving shaft and the cylinder body. During the welding process, the receiving shaft and the cylinder body themselves do not rotate, and the direct full welding operation without spot welding is realized. This avoids the problem of coarse structure and uneven mechanical properties caused by secondary heating and melting of the spot welding area, and ensures the welding quality.

[0039] During the circumferential welding process, the alignment mechanism 4 drives the heat-insulating mechanism 5 to rotate synchronously, so that the heat-insulating mechanism 5 actively cools the inner and outer sides of the cylinder and the positions on both sides of the weld point, effectively limiting the heat conduction of the weld point and alleviating heat accumulation, thereby improving the stability and consistency of the welding quality.

[0040] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The alignment mechanism 4 includes a frame 41 that rotates on the base cylinder 3. Several roller assemblies 42 slide along the radial direction of the frame 41. The roller assemblies 42 are arranged at equal intervals along the circumference of the frame 41. A drive assembly 43 for driving the frame 41 to rotate is provided on both the frame 41 and the base cylinder 3. A moving assembly 44 for adjusting the position of the receiving plate shaft is provided on the base cylinder 3.

[0041] Before welding, the robot arm 2 drives the base cylinder 3 to move the cylinder frame 41 to the position of the receiving shaft, so that the roller assembly 42 is located on the outside of the cylinder body end and the moving assembly 44 is located on the outside of the receiving shaft end. Then, the cylinder body is externally clamped by synchronously moving the roller assembly 42, and the receiving shaft is clamped and connected by the moving assembly 44.

[0042] Subsequently, the actuator of the robotic arm 2 moves vertically upward, causing the base cylinder 3 to lift the cylinder body through the cylinder frame 41 and the roller assembly 42. At the same time, the base cylinder 3 lifts the receiving shaft synchronously through the moving assembly 44, so that the cylinder body is suspended in the air and the receiving shaft is located at the theoretical coaxial position of the base cylinder 3. At this time, the receiving shaft does not contact the inner side of the base cylinder 3.

[0043] Then, the cylinder body is rotated by the roller assembly 42, and the cylinder frame 41 itself is kept from rotating by the drive assembly 43, thereby monitoring the dynamic balance of the cylinder body in real time and transmitting the data to the microcomputer. The microcomputer controls the moving assembly 44 to drive the receiving shaft to the actual coaxial position of the cylinder body according to the dynamic balance data. Then, the execution end of the robot arm 2 is lowered and the aligned cylinder body is placed on the placement frame 1 again. The contact friction between the placement frame 1 and the cylinder body prevents the cylinder body from rotating. The base cylinder 3 is clamped by the receiving shaft through the moving assembly 44, thereby limiting the rotation of the receiving shaft.

[0044] Continue reading Figure 1 , Figure 2 , Figure 3 and Figure 4 The heat-insulating mechanism 5 includes an air blowing assembly 52 and an arc-shaped aerosol nozzle 53 connected to the cylinder frame 41 via an adjustment assembly 51. A welding torch 54 is connected to the adjustment assembly 51.

[0045] During welding, the drive assembly 43 drives the cylinder frame 41 to rotate, and the cylinder frame 41 drives the roller assembly 42 to rotate around the outside of the cylinder body. At the same time, the cylinder frame 41 drives the welding torch 54 to move along the weld seam trajectory through the adjustment assembly 51, so that the welding torch 54 can directly perform full welding operation on the connection between the cylinder body and the receiving plate shaft. During this process, the cylinder body and the receiving plate shaft remain stationary. During the welding process, the adjustment assembly 51 synchronously drives the air blowing assembly 52 and the arc-shaped air mist nozzle 53 to rotate synchronously with the welding torch 54.

[0046] The air blowing assembly 52 is positioned inside the cylinder and on both sides of the corresponding weld point, while the arc-shaped aerosol nozzle 53 is positioned outside the cylinder and on both sides of the corresponding weld point. This allows the air blowing assembly 52 to perform directional air blowing for active cooling of the weld, and the arc-shaped aerosol nozzle 53 to perform atomized spraying for active cooling of the weld. Through the synergistic effect of the two, the heat of welding is effectively limited to be conducted along the cylinder, alleviating the problem of uneven temperature field caused by heat accumulation, and further improving the welding quality.

[0047] To enable the roller assembly 42 to quickly clamp onto the outside of the cylinder, facilitate the rotation of the cylinder by the roller assembly 42, and monitor the dynamic balance of the cylinder, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 , Figure 4 and Figure 5 The roller assembly 42 includes a movable seat 421 that is radially slidably connected to the cylinder frame 41. A roller 422 is rotatably connected to the movable seat 421. A force sensor is integrated between the roller 422 and the movable seat 421. A direct drive motor 423 for driving the roller 422 is fixedly installed on the side of the movable seat 421 away from the roller 422. A rotating platform 411 is rotatably provided on the cylinder frame 41. The rotating platform 411 is hinged to each movable seat 421 through several connecting plates 412.

[0048] It should be noted that the force sensor in this embodiment adopts a mature force monitoring scheme in the prior art, which will not be described in detail here, and the force sensor is not shown in the figure.

[0049] In the initial state, the rotating platform 411 pushes each movable seat 421 through the connecting plate 412, so that the movable seat 421 drives the roller 422 on it away from the cylinder frame 41. When the roller 422 moves to the outer side of the end of the cylinder, the rotating platform 411 drives the roller 422 to abut against the outer side of the cylinder, so that the cylinder frame 41 and the base cylinder 3 are in the theoretical coaxial position of the cylinder.

[0050] When the cylinder body is lifted, all direct drive motors 423 are started simultaneously to drive the corresponding rollers 422 to rotate. The rollers 422 drive the cylinder body to rotate through friction. During the rotation of the cylinder body, the dynamic balance of the cylinder body is monitored by force sensors, and the dynamic balance data of the cylinder body is transmitted to the microcomputer in real time. The microcomputer then uses this dynamic balance data to adjust the receiving plate shaft to move to the actual coaxial position of the cylinder body, achieving high-precision coaxial alignment.

[0051] The rotating platform 411 in this embodiment includes a rotating ring rotatably connected to the cylindrical frame 41, and a fixed bevel gear fixedly installed on the outside of the cylindrical frame 41 and located inside the rotating ring. An active bevel gear meshing with the fixed bevel gear is rotatably connected to the rotating ring, and a micro motor that drives the active bevel gear is fixedly installed. The micro motor drives the active bevel gear to rotate, so that the active bevel gear rotates around the fixed bevel gear, thereby causing the active bevel gear to drive the rotating ring to rotate. During the rotation, the rotating ring pushes and pulls the movable seat 421 through the connecting plate 412.

[0052] To facilitate the adjustment of the receiving disc shaft position based on the dynamic balance data during cylinder rotation, the present invention designs the following structure: (See attached diagram) Figure 3 , Figure 4 , Figure 5 and Figure 6 The moving component 44 includes two symmetrically arranged hydraulic cylinders 441 fixedly installed on the outside of the base cylinder 3. A stop block 442 for clamping the receiving shaft is fixedly installed on the telescopic section of the hydraulic cylinder 441. When the cylinder body rotates relative to the receiving shaft, the stop block 442 clamps the outside of the receiving shaft.

[0053] The microcomputer synchronously controls the telescopic sections of the two hydraulic cylinders 441 to extend and retract in opposite directions based on the dynamic balance data. This allows the two abutments 442 to move synchronously while maintaining the clamping of the receiving disc shaft. Consequently, the abutments 442 drive the receiving disc shaft to adjust its position relative to the cylinder body, achieving precise coaxial alignment between the receiving disc shaft and the actual rotation axis of the cylinder body.

[0054] It is worth noting that the microcomputer uses a mature algorithm based on the dynamic balance data to control the extension and retraction section of the hydraulic cylinder 441. The specific algorithm process will not be elaborated in this article.

[0055] To facilitate keeping the cylinder frame 41 stationary while rotating the cylinder body, and to actively rotate the cylinder frame 41 during welding so that the welding torch 54 rotates along the weld seam for direct full welding of the cylinder body and the receiving shaft, the present invention is designed with the following structure: (See reference) Figure 2 and Figure 5 The drive assembly 43 includes a geared motor 431 fixedly installed on the outside of the base cylinder 3. The geared motor 431 drives the cylinder frame 41 to rotate through a synchronous belt drive structure.

[0056] The synchronous belt drive structure in this embodiment includes a drive pulley fixedly mounted on the output shaft of the geared motor 431, a driven pulley fixedly mounted on the outside of the cylinder frame 41, and a synchronous belt wound around the outside of the drive pulley and the driven pulley. When the geared motor 431 stops, the geared motor 431 maintains the cylinder frame 41 in a non-rotating state through the synchronous belt; conversely, it controls the cylinder frame 41 to rotate.

[0057] To facilitate welding of cylinders of different diameters, this invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 , Figure 4 and Figure 7 The adjustment assembly 51 includes an automatic telescopic arm 511 fixedly installed on the outside of the cylinder frame 41. A support rod 512 is slidably connected to the automatic telescopic arm 511 along the cylinder axis. The end of the support rod 512 is fixedly connected to the welding torch 54.

[0058] Before welding, based on the diameter of the cylinder and the depth of the weld relative to the end of the cylinder, the operator manually moves the support rod 512 in advance so that the support rod 512 can drive the welding torch 54 to extend to the depth of the weld. Then, the support rod 512 is fixedly connected to the automatic telescopic arm 511 by the fastening screws on the automatic telescopic arm 511.

[0059] Then, by radially adjusting the position of the support rod 512 and the welding torch 54 through the automatic telescopic arm 511, the welding torch 54 is finally aligned with the weld seam. When the cylinder frame 41 rotates, the cylinder frame 41 drives the welding torch 54 to rotate and perform full welding operation along the annular weld seam through the automatic telescopic arm 511 and the support rod 512.

[0060] In this embodiment, the automatic telescopic arm 511 includes a support arm seat fixedly installed on the outside of the cylinder frame 41. An L-shaped plate is slidably arranged on the support arm seat along its length direction. A cylinder is fixedly installed on the L-shaped plate. The telescopic section of the cylinder is fixedly connected to the support arm seat. The overall length of the automatic telescopic arm 511 is adjusted by the telescopic section of the telescopic cylinder. The support rod 512 is connected to the L-shaped plate, thereby adjusting the radial position of the welding torch 54.

[0061] It should be noted that when welding rollers of the same diameter, the present invention only needs to adjust the position of the automatic telescopic arm 511 and the support rod 512 once to continuously perform welding operations on the rollers.

[0062] Since both receiving discs on the receiving shaft are located inside the cylinder body during welding, the weld seam is also located inside the cylinder body. Therefore, during welding, poor air circulation inside the cylinder body can easily lead to excessively high ambient temperatures. To alleviate heat accumulation in the cylinder body and improve the working environment, this invention designs the following structure: (See attached diagram) Figure 2 , Figure 4 and Figure 7 The air blowing assembly 52 includes two sets of pipes fixedly connected to the end of the support rod 512. Each set of pipes includes an air outlet pipe 521 and an air intake pipe 522. The outlet of the air outlet pipe 521 and the outlet of the air intake pipe 522 are arranged opposite to each other in the same set, and the outlet of the air outlet pipe 521 faces away from the welding gun 54.

[0063] Continue reading Figure 2 , Figure 4 and Figure 7The arc-shaped aerosol nozzle 53 is fixedly connected to the automatic telescopic arm 511. The arc-shaped aerosol nozzle 53 is provided with two sets of atomizing nozzles, which correspond to two sets of air outlet pipes 521 and air intake pipes 522 respectively. The arc-shaped aerosol nozzle 53 is connected to an external water supply device, the air outlet pipe 521 is connected to an air pump, and the air intake pipe 522 is connected to an air extraction device.

[0064] When the cylinder frame 41 drives the welding torch 54 to perform welding, the support rod 512 and the automatic telescopic arm 511 synchronously drive the two sets of pipes and the arc-shaped aerosol nozzle 53 to rotate. During welding, the arc-shaped aerosol nozzle 53 is located on the outside of the cylinder body, and the two sets of pipes are located on the inside of the cylinder body. The two sets of pipes are located on both sides of the welding torch 54, so that the two sets of atomizing nozzles are also located on both sides of the welding torch 54, preventing direct cooling of the weld point.

[0065] During welding, the exhaust pipe 521 sprays cooling airflow onto the inside of the cylinder and onto both sides of the weld point, thereby performing active cooling by blowing air. The airflow actively moves away from the weld pool to prevent direct cooling of the weld point. At the same time, the suction pipe 522 quickly draws in the high-temperature gas generated inside the cylinder due to welding, improving the welding operation temperature.

[0066] The arc-shaped aerosol nozzle 53 sprays water mist onto the outside of the cylinder and on both sides of the weld point, performing atomized spraying for active cooling. Through the combined cooling effect of the inside and outside, it effectively limits the conduction of welding heat along the cylinder and alleviates the problem of uneven temperature field caused by heat accumulation.

[0067] In this embodiment, the air output volume, air output speed, and temperature of the air outlet pipe 521, and the water output volume and cooling water temperature of the arc-shaped aerosol nozzle 53 are obtained through repeated experiments by those skilled in the art. This can effectively alleviate heat accumulation and prevent large fluctuations in the temperature of the weld pool, thus ensuring welding quality.

[0068] In summary, this invention achieves high-precision dynamic balancing and coaxial alignment of the cylinder body and the receiving shaft, as well as direct full welding without spot welding. During the welding process, the welding torch 54 actively rotates circumferentially along the weld seam while the cylinder body and the receiving shaft remain stationary, avoiding structural defects caused by secondary heating during spot welding. Simultaneously, the air outlet pipe 521 and the arc-shaped aerosol nozzle 53, which move synchronously with the welding torch 54, actively cool the cylinder body with air and atomize it with spray, respectively, alleviating the problem of welding heat accumulation and ensuring the consistency and stability of weld quality. This device has a compact structure and a high degree of automation, and has outstanding practical value in improving the welding accuracy of conveyor rollers, improving the performance of welded joints, and increasing production efficiency.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic welding device for conveyor rollers, comprising a placement frame for supporting the roller body and two robotic arms, characterized in that, The robotic arm's actuator is equipped with an alignment mechanism and a heat-insulating mechanism via a base cylinder. The alignment mechanism is used to align the cylinder body with the receiving shaft. The alignment mechanism includes a frame that rotates on the base cylinder, a plurality of roller assemblies that slide radially on the frame, the plurality of roller assemblies being arranged at equal intervals along the circumference of the frame, a drive assembly for driving the frame to rotate being provided on both the frame and the base cylinder, and a moving assembly for adjusting the position of the receiving plate shaft being provided on the base cylinder. The roller assembly includes a movable seat that is radially slidably connected to the cylinder frame, a roller that is rotatably connected to the movable seat, and a force sensor integrated between the roller and the movable seat; A self-rotating platform is rotatably mounted on the cylindrical frame, and the self-rotating platform is hinged to each movable seat through several connecting plates. The movable component includes two symmetrically arranged hydraulic cylinders fixedly installed on the outside of the base cylinder, and abutments for clamping the receiving plate shaft are fixedly installed on the telescopic section of the hydraulic cylinders. Before welding, the roller assembly lifts and rotates the cylinder body, monitors the dynamic balance of the cylinder body in real time, and transmits the data to the microcomputer. The microcomputer controls the moving component to drive the receiving plate shaft to the axis position of the cylinder body based on the dynamic balance data. The heat-insulating mechanism includes an air-blowing assembly and an arc-shaped aerosol nozzle connected to the cylinder frame via an adjustment assembly, and a welding torch is connected to the adjustment assembly. During welding, the drive assembly drives the welding torch along the weld seam through the cylinder frame and the adjustment assembly. At the same time, the adjustment assembly drives the air blowing assembly and the arc-shaped air mist nozzle to cool the area outside the weld point. The cylinder body and the receiving plate shaft are welded by using dynamic balancing coaxial positioning, rotating the welding gun along the seam, and cooling the welding point outside the position.

2. The automatic welding device for conveyor rollers according to claim 1, characterized in that, A direct drive motor for driving the roller is fixedly installed on the side of the movable seat away from the roller.

3. The automatic welding device for conveyor rollers according to claim 1, characterized in that, The drive assembly includes a geared motor fixedly installed on the outside of the base cylinder, which drives the cylinder frame to rotate via a synchronous belt drive structure.

4. The automatic welding device for conveyor rollers according to claim 1, characterized in that, When the cylinder rotates relative to the receiving shaft, the abutment is clamped on the outside of the receiving shaft. By extending and retracting the telescopic sections of the two hydraulic cylinders in opposite directions, the receiving shaft is pushed to move to the coaxial position of the cylinder.

5. The automatic welding device for conveyor rollers according to claim 1, characterized in that, The adjustment assembly includes an automatic telescopic arm fixedly installed on the outside of the cylinder frame. A support rod is slidably connected to the automatic telescopic arm along the cylinder axis, and the end of the support rod is fixedly connected to the welding torch.

6. The automatic welding device for conveyor rollers according to claim 5, characterized in that, The air blowing assembly includes two sets of pipes fixedly connected to the end of the support rod. Each set of pipes includes an air outlet pipe and an air intake pipe. The outlet pipe and the intake pipe in the same set are arranged opposite to each other, and the outlet pipe faces away from the welding gun.

7. The automatic welding device for conveyor rollers according to claim 6, characterized in that, The arc-shaped aerosol nozzle is fixedly connected to the automatic telescopic arm. The arc-shaped aerosol nozzle is equipped with two sets of atomizing nozzles, which correspond to two sets of air outlet pipes and air inlet pipes, respectively.

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