Full-automatic ring seam welding machine for carrier roller

Abstract

The present application relates to the technical field of welding equipment, and discloses a full-automatic ring seam welding machine for carrier rollers, which comprises a concave table, a supporting frame is arranged at the bottom of the concave table to isolate and support the bottom of the concave table; two machining stations are arranged at the top of the concave table, and track grooves for switching the stations are arranged on the front and back sides of the middle part of the top of the concave table. By increasing and arranging an end part processing mechanism, the mechanism can not only realize accurate butt joint of the center parts on both sides through a synchronous cross seat, ensure coaxial operation of the centering structure and synchronous rotation of the roller body, but also can calibrate the parallelism of the protective end cover through an inner-outer double-layer alignment structure, and the outer alignment seat is used to adhere to the outer side of the protective end cover, and the inner alignment seat is driven by hydraulic transmission to hold the inner side of the protective end cover, so that the inclination deviation of the protective end cover can be corrected reliably through the inner-outer cooperative action, and the parallelism between the inner and outer sides of the protective end cover and the end surface of the roller body is ensured.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a fully automatic circumferential seam welding machine for idler rollers. Background Technology

[0002] Metal idlers are a key component of belt conveyors. Their roller bodies are typically made of seamless cylindrical steel tubing and house internal bearing structures. To protect the internal bearings from external impurities and ensure stable operation, circular protective end caps with shaft holes are welded to both ends of the roller body. The reliable connection between the protective end caps and the roller body provides a stable protective environment for the internal bearings and optimizes the overall structural strength of the idler, thereby improving its operational stability and extending its service life. Therefore, the welding process between the roller body and the protective end caps is an indispensable and crucial step in idler manufacturing.

[0003] In conventional idler roller manufacturing processes, before welding circular protective end caps to both ends of the roller body, workers must manually align the protective end caps with the roller body before proceeding with the welding process. Due to subjective biases and limitations of manual operation, it is difficult to guarantee the concentricity between the roller body and the protective end cap. Furthermore, because the protective end cap extends into the roller body, the parallelism between the roller end and the protective end cap cannot be effectively guaranteed, easily leading to problems such as misalignment and angular tilting.

[0004] The assembly precision defects caused by manual alignment directly affect the subsequent processing quality and performance of the idler rollers. Welded idler rollers are prone to problems such as rotational eccentricity and running vibration, which not only accelerates uneven wear of internal bearings and reduces the overall service life of the bearings and idler rollers, but also causes conveyor belt misalignment and vibration during operation, affecting the operational stability and efficiency of the conveyor equipment and failing to meet the industry's actual requirements for idler roller product quality and reliable equipment operation. Therefore, those skilled in the art have proposed a fully automatic circumferential seam welding machine for idler rollers to solve the aforementioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fully automatic circumferential seam welding machine for idler rollers, which solves the problem that manual alignment of the roller body and protective end cap can easily cause the idler roller to deviate and vibrate during subsequent use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fully automatic circumferential seam welding machine for idler rollers, comprising, A concave platform, with a support frame at the bottom for bottom isolation and support fixation; The top of the concave table is equipped with two processing stations, namely the first station and the second station. The front and rear sides of the middle of the top of the concave table are provided with track grooves for station switching. The track grooves are equipped with station adjustment seats that can move linearly back and forth. A shaping and centering mechanism is set on a concave platform and is used to perform circumferential shaping of the roller body before welding and to center the protective end caps installed at both ends. The end processing mechanism, which is set on the workstation adjustment seat, is used to calibrate the parallelism between the end face of the roller body after being processed by the molding centering mechanism and the end face of the protective end cover. A multi-segment welding mechanism is set on a concave platform for segmented welding of the roller body after the end processing mechanism and the end caps on both ends of the roller. The scale-free cooling mechanism, which is set on the concave platform, is used to perform scale-free cooling and shaping treatment on the idler rollers after the multi-section welding mechanism has been processed.

[0007] Preferably, the molding centering mechanism includes an arc-shaped support. An arc-shaped support is provided at the top center of the workstation adjustment seat. Bottom drive rollers are provided on both sides of the bottom of the arc groove of the arc-shaped support. A second drive motor for driving the bottom drive rollers is provided on the upper middle part of one side of the arc-shaped support. Auxiliary rotating rollers are provided at the four corners inside the arc groove of the arc-shaped support. Mounting bases are provided on both sides of the top of the concave platform. Multiple hydraulic adjustment cylinders are equidistantly provided on the middle of both sides of the top of the concave platform. The top of the rod of the hydraulic adjustment cylinder is connected to the corresponding position of the bottom end of the mounting base on the same side. Mounting base three is fixedly connected to one side of the middle of the bottom end of the mounting base. Molding rollers are rotatably connected to the middle of the bottom end of the mounting base three.

[0008] Preferably, the molding centering mechanism further includes openings. Openings are provided on both sides of the top center of the concave platform. A lifting seat capable of vertical linear movement is mirror-imagely arranged within each of the two openings. A mounting base two is fixedly connected to the upper center of one side of each lifting seat. A side drive roller two is rotatably connected to the center of the mounting base two. A drive motor three for driving the side drive roller two is provided on the center of one side of each mounting base two. Mounting base one is fixedly connected to the center of both sides of the inner wall of the top of the concave platform. A side drive roller one is provided on the center of the adjacent side of mounting base one. A drive motor one for driving the side drive roller one on the same side is provided on the center of one side of mounting base one.

[0009] Preferably, the molding centering mechanism further includes a synchronization seat. Synchronization seats are provided on both sides of the top center of the workstation adjustment seat for synchronous linear movement in opposite directions. Eddy current displacement sensors for monitoring the concentricity of the roller during rotation are provided on both ends of the lower inner side of the synchronization seat. Rotary seats are rotatably connected to the middle of adjacent sides of the synchronization seat. Sleeves are fixedly connected to the middle of the rotating seats. Multiple slots are arranged circumferentially on one side of the middle of the sleeve. Arc-shaped magnetic moving seats are slidably connected within each slot. A central rod is slidably connected inside the sleeve. The outer wall of the central rod consists of opposite magnetic parts on both sides and a same magnetic part in the middle.

[0010] Preferably, the end processing mechanism includes a synchronous cross seat, one end of the central rod is fixedly connected to the synchronous cross seat, and the other end of the central rod near the synchronous cross seat has a cross groove that matches the shape and size of the synchronous cross seat. Multiple outer alignment seats are arranged in a circumferential array on one side of the middle portion of the outer wall of the sleeve.

[0011] Preferably, the end processing mechanism further includes a sealing mounting seat. Multiple sealing mounting seats are arranged in a circumferential array on one side of the middle portion of the outer wall of the central rod. Each sealing mounting seat has an inner alignment seat that is driven to rise and fall by liquid. A sealing liquid cavity is opened on one side of the inner portion of the central rod. The sealing liquid cavity is completely filled with hydraulic oil. A piston seat is provided inside the sealing liquid cavity. A push rod is provided in the middle of the piston seat. The other end of the push rod passes through the central rod and is connected to the middle of the inner end of the sleeve. A return spring is sleeved on the outer wall of the push rod. The two ends of the return spring are respectively connected to the corresponding positions of the sleeve and the central rod.

[0012] Preferably, the multi-segment welding mechanism includes spot welding guns. Spot welding guns for intermittent spot welding of the connection between the roller body and the protective end cap are provided on both sides of the middle part of the inner wall of the top of the concave platform. A ring welding gun for continuous welding of the connection between the roller body and the protective end cap is provided on the upper middle part of the side adjacent to the synchronous seat.

[0013] Preferably, the scale-free cooling mechanism includes directional nozzles, and two directional nozzles are equidistantly arranged on the side wall of the concave platform away from the spot welding gun. Temperature sensors for monitoring the temperature at the connection between the roller body and the protective end cover are arranged on the upper middle part of the adjacent side of the synchronization seat, and a PLC controller is arranged in the middle of one side of the front end of the concave platform.

[0014] Preferably, the scale-free cooling mechanism further includes a negative pressure gas-liquid mixing box. The negative pressure gas-liquid mixing box is provided in the middle of one side of the outer wall of the concave platform, and the negative pressure gas-liquid mixing box is connected to the interior of the directional nozzle through internal flow channels. A liquid metering valve is provided in the middle of one side of the negative pressure gas-liquid mixing box, an air flow regulating valve is provided in the middle of the other side of the negative pressure gas-liquid mixing box, and a gas-liquid ratio regulating valve is provided in the middle of the top of the negative pressure gas-liquid mixing box.

[0015] Working Principle: When welding the protective end caps on both ends of the roller body, the molding and centering mechanism is first activated. At this time, the station adjustment seat is stably positioned at the first station position on the concave platform. The operator smoothly places the roller body to be processed into the arc-shaped support on the station adjustment seat. The arc-shaped fitting structure of the arc-shaped support provides precise support for the roller body, ensuring that the roller body does not shift after placement. At the same time, the auxiliary rotating roller rolling contact design on the arc-shaped support effectively reduces the contact area and frictional resistance between the outer wall of the roller body and the inner wall of the arc-shaped support, facilitating subsequent rotation adjustment and position calibration of the roller body. Subsequently, the operator initially attaches the protective end caps to be welded to both ends of the roller body, ensuring that the protective end caps are initially aligned with the ends of the roller body, thus successfully completing the process. After completing all preparatory work before welding the roller body, the hydraulic regulating cylinder near the concave platform of the first workstation is simultaneously activated. Upon activation, the rod on the hydraulic regulating cylinder smoothly retracts according to a preset stroke. During the retraction of the rod, the mounting base fixedly connected to it moves downwards synchronously. As the mounting base moves downwards, it further moves the mounting seat three fixedly mounted at its bottom and the molding roller together downwards until the surface of the molding roller is tightly pressed against the surface of the roller body placed on the arc-shaped support. At this point, the rod of the hydraulic regulating cylinder immediately stops retracting, maintaining its current downward pressure to achieve initial positioning of the roller body. Simultaneously, the lifting seat near the opening of the first workstation moves upwards smoothly. During the upward movement of the lifting seat, the upper mounting seat... The second mounting base and the second side drive roller move together. After the second side drive roller on the second mounting base makes tight contact with the outer wall of the roller on the arc-shaped support and achieves lateral limiting, the lifting base stops moving. At this time, the roller is limited by the molding roller and the second side drive roller to ensure that no deviation occurs during subsequent rotation. Then, the second drive motor on the arc-shaped support starts. After starting, the second drive motor precisely drives the bottom drive roller on the arc-shaped support to rotate at a constant speed through the transmission structure. During the rotation, the bottom drive roller drives the roller on the arc-shaped support to rotate synchronously and uniformly through the friction between itself and the bottom of the roller. At the same time, the third drive motor on the lifting base near the first station starts synchronously. After starting, the third drive motor drives the second side drive roller on the second mounting base to rotate synchronously. During rotation, the second side drive roller, through friction with the side of the roller body, assists in driving the roller body on the arc-shaped support to rotate synchronously. Simultaneously, the first drive motor on the mounting base near the first workstation also starts synchronously. After starting, the first drive motor synchronously drives the first side drive roller on it to rotate at a uniform speed. During its rotation, the first side drive roller, also through friction, assists in driving the roller body on the arc-shaped support to rotate synchronously. Through the coordinated drive of the bottom drive roller, the second side drive roller, and the first side drive roller, the roller body on the arc-shaped support can rotate smoothly and at a uniform speed, providing stable conditions for subsequent inspection and molding. During the process of driving the roller body on the arc-shaped support to rotate through these three directions, the eddy current displacement sensor on the synchronous base is activated synchronously.The concentricity of the rollers during rotation is monitored in real time and accurately to promptly detect radial deviations and ensure rotational precision. Simultaneously, the rollers on the arc-shaped support undergo pre-processing shaping via the shaping rollers on mounting base three. These rollers, through close contact with the rotating roller surface, correct minor surface deformations, ensuring the rollers' circumference before welding and guaranteeing the accuracy of subsequent protective end cap installation and welding. Once the concentricity of the rollers is verified and shaping is complete, all drive motors synchronously stop, ceasing the rotation of the rollers on the arc-shaped support. Then, the synchronizing seat on the workstation adjustment base starts, smoothly moving synchronously towards both ends of the rollers on the arc-shaped support according to a preset trajectory. During the movement of the synchronous seat, it drives the sleeve and center rod fixed on it to be slowly inserted into the roller body through the openings in the bearing seats at both ends of the roller body. This ensures that the sleeve and center rod do not collide with the inner wall of the roller body and bearing seats during insertion. As the synchronous seat on the work position adjustment seat continues to move, the distance between the two synchronous seats shortens synchronously. When the ends of the two center rods come into contact with each other, the synchronous seat continues to move towards the center. Both center rods are subjected to mutual squeezing force and move smoothly into the sleeve on their respective sides. During the movement of the center rod, the opposite magnetic parts on the center rod that originally corresponded to the slots on the sleeve are replaced by the same magnetic parts. The opposite magnetic attraction force generated by the opposite magnetic parts on the arc-shaped magnetic moving seat in the slot is then transformed into the same magnetic attraction force. The repulsive force between the part and the arc-shaped magnetic moving seat synchronously pushes the arc-shaped magnetic moving seats in the slots on the sleeve to move outward synchronously. Since the sleeve on the synchronous seat is always at the center of the roller, the arc-shaped magnetic moving seats moving outward synchronously at various positions on the sleeve can accurately calibrate and center the protective end caps at the center of both ends of the roller, ensuring that the protective end caps are always accurately at the center of both ends of the roller, providing a reliable guarantee for the subsequent positioning and welding of the protective end caps on the roller. Then, the end processing mechanism is activated. After the molding and centering mechanism accurately positions the protective end caps at the center of both ends of the roller, the synchronous seat on the station adjustment seat continues to move synchronously towards the center. During the movement of the synchronous seat, the synchronous... The sleeve and center rod move together towards the center. During this movement, the synchronous cross seat at the end of the center rod precisely inserts into the corresponding cross groove on the other side of the center rod. This cross positioning structure ensures the coaxiality of the sleeve and center rod during movement, preventing offset. It also ensures that when the roller on the arc-shaped support is driven to rotate, the rotation angles at both ends of the roller remain synchronized, preventing the protective end caps from shifting due to asynchronous rotation. As the synchronous seats move towards the center, the outer alignment seats at various positions on the sleeve gradually come into close contact with the outer surfaces of the protective end caps at both ends of the roller. Through the planar contact of the outer alignment seats, the parallelism between the outer surface of the protective end caps and the end faces of the roller is precisely aligned and adjusted.To correct the tilting deviation of the protective end cap, the push rod inside the sleeve moves synchronously with the continuous movement of the sleeve. During this movement, the push rod drives the piston seat fixedly connected to it to move smoothly and synchronously within the sealing fluid chamber inside the central rod. As the piston seat moves under the drive of the push rod, it squeezes the hydraulic oil in the sealing fluid chamber, causing the hydraulic oil to enter the sealing mounting seat under pressure. This hydraulic oil then exerts a squeezing force on the inner alignment seat within the sealing mounting seat, smoothly pushing the inner alignment seat out of the sealing mounting seat. The inner alignment seat extending from the sealing mounting seat then comes into close contact with the inner surface of the protective end cap during the subsequent continuous movement of the sleeve, precisely ensuring the parallelism between the two end faces of the roller and the inner surface of the protective end cap. Alignment adjustment: Because the outer alignment seat, sealing mounting seat, and inner alignment seat always maintain a preset parallel relationship, the synergistic action of the outer and inner alignment seats reliably ensures the parallelism between the inner and outer sides of the protective end caps on the roller body and the roller body end face. This ensures the welding accuracy of the subsequent roller body and its protective end caps during the welding process, as well as the forming effect of the finished roller. This smoothly completes the parallelism alignment and adjustment of the roller body end face and the surfaces of the protective end caps on both sides. Afterwards, the multi-segment welding mechanism is started. At this time, the roller body in the first station of the concave platform has completed the concentricity calibration and parallelism adjustment of the roller body and its protective end caps at both ends through the molding centering mechanism and the end processing mechanism. Then, the arc alignment is started again. The multi-directional drive operation of the roller on the shaped support causes the roller and its protective end cap, located in the first station, to rotate synchronously at a slow and uniform speed, ensuring uniform weld seams during the welding process. During the synchronous rotation of the roller and the protective end cap, the spot welding gun on the concave table starts simultaneously. The spot welding gun performs uniform electric welding on the connection between the roller and its protective end cap according to the preset spot welding spacing and intensity. This spot welding initially fixes the roller and its protective end caps at both ends, preventing positional displacement of the protective end caps during subsequent movement and circumferential welding. After the initial fixing spot welding is completed, the hydraulic adjusting cylinder on the concave table and the lifting seat in the opening synchronously reset to their initial state, releasing the limit on the roller. Afterwards, the staff issues commands through the control equipment to control the smooth movement of the station adjustment seat within the track groove on the concave table. This allows the roller, which has undergone initial welding and positioning, to move precisely to the second station position on the concave table. Once the roller is stably in place, the hydraulic adjustment cylinder and lifting seat near the second station on the concave table simultaneously reset to their working state from the first station, precisely limiting the roller again and providing stable support for subsequent circumferential welding and cooling processes. Then, the roller in the second station rotates slowly and evenly again through multi-directional drive operation. During its continuous rotation, the directional nozzles on the concave table activate, spraying high-pressure gas towards the spot welding position at the end of the roller to rapidly cool the welding area.This cooling operation serves two purposes: firstly, it rapidly cools and solidifies the spot weld locations on the roller body, reinforcing the spot weld fixation and preventing deformation due to insufficient cooling; secondly, it effectively reduces the initial temperature of the roller body during subsequent circumferential welding, preventing thermal deformation of the roller body and protective end cap caused by excessively high temperatures during the circumferential welding process, which would affect welding accuracy. After the spot weld locations at both ends of the roller body return to normal temperature, the circumferential welding gun on the synchronous seat is activated. As the roller body rotates at a constant speed, the welding gun performs uniform and continuous circumferential welding at the connection point between the roller body and the protective end cap. This segmented welding process—first spot welding for fixation, then circumferential welding for reinforcement—ensures a tight and strong weld, thus completing the segmented welding process of the roller body. Afterward, the scale-free cooling mechanism is activated, at which point the circumferential weld locations at both ends of the roller body... The roller is placed in a high-temperature state immediately after welding. If it is not cooled down in time, it is prone to thermal deformation, which will affect the accuracy of the finished roller. The roller in the second station continues to rotate slowly and uniformly under multi-directional drive operation to ensure uniform cooling and correction. During the rotation of the roller, the eddy current displacement sensor on the synchronous seat is activated again to detect the circumference of the outer wall of the roller after welding in real time and to capture the thermal deformation caused by high-temperature circumferential welding. When thermal deformation is detected, the eddy current displacement sensor immediately transmits the detection result to the PLC controller. The PLC controller quickly analyzes and processes the detection data and controls the rod of the hydraulic adjusting cylinder in the second station to retract again. During the retraction of the rod of the hydraulic adjusting cylinder, it drives the mounting base at its bottom and the molding roller to retract synchronously. The process involves moving the forming roller to apply uniform pressure to the roller surface on the arc-shaped support. Then, through the coordinated action of the forming roller, side drive roller one, and side drive roller two, the roller on the arc-shaped support, which has deformed after high-temperature circumferential welding, is precisely corrected during rotation, gradually restoring the circumferential accuracy of the roller. During this correction process, high-pressure gas enters the negative pressure gas-liquid mixing chamber precisely at a preset flow rate through the inlet flow regulating valve, while cooling liquid enters the chamber at a preset ratio through the liquid metering valve. Inside the chamber, under the Venturi negative pressure effect, the high-pressure gas and cooling liquid are torn and broken apart by the high-speed airflow, forming uniform micron-sized fine droplets. This process creates a uniform, atomized two-phase mixture within the negative pressure gas-liquid mixing chamber, ensuring uniform cooling without liquid accumulation. The atomized cooling medium is then precisely delivered to directional nozzles through internal channels. These nozzles accurately spray the atomized cooling medium onto the weld area between the roller and the protective end cap, as well as the weld transition zone between the protective end cap and the roller. This ensures precise cooling without affecting other parts of the roller. Upon contact with the high-temperature workpiece surface, the fine droplets rapidly vaporize, quickly absorbing heat while simultaneously evaporating completely, leaving no liquid residue on the workpiece surface. This achieves rapid, uniform, and gentle cooling of the weld and transition areas, preventing micro-cracks caused by sudden cooling.During this process, the temperature sensor on the synchronous mount collects the temperature information of the roller in real time and transmits the collected temperature data to the PLC controller. Upon receiving the temperature data, the PLC controller immediately performs real-time calculations and analysis. Based on the actual temperature of the roller, cooling requirements, and correction rhythm, it adjusts the gas-liquid mixing ratio, the injection flow rate of the atomized cooling medium, and the injection angle of the directional nozzles in real time through the gas-liquid ratio regulating valve, liquid metering valve, and air flow regulating valve on the negative pressure gas-liquid mixing box. This ensures that the cooling rate is precisely matched with the correction and shaping rhythm of the roller, guaranteeing both the cooling and shaping effect and avoiding workpiece damage caused by excessive cooling. This successfully completes the scale-free cooling and shaping treatment of the idler roller after welding, ensuring the precision and service life of the finished idler roller.

[0016] This invention provides a fully automatic circumferential seam welding machine for idler rollers. It has the following beneficial effects: 1. This invention adds and sets a molding and centering mechanism. Before welding the roller body, this mechanism provides stable support to the roller body through an arc-shaped support, reduces frictional resistance with the help of an auxiliary rotating roller, and drives the roller body to rotate at a uniform speed from different directions through multiple sets of drive rollers. This ensures smooth and stable rotation of the roller body and provides stable conditions for concentricity detection and circumferential molding. On the one hand, this processing method uses an eddy current displacement sensor to detect the concentricity of the roller body in real time, and uses the molding roller to correct minor deformations of the roller body, ensuring the circumferential accuracy of the roller body before processing. On the other hand, this mechanism uses a magnetic transmission structure to achieve automatic centering of the protective end cap, replacing the traditional manual alignment method, eliminating human operation deviations at the source, ensuring that the protective end cap and the roller body remain precisely concentric, laying a reliable foundation for subsequent welding processes, and effectively avoiding problems such as rotational eccentricity and running jumps in the finished roller.

[0017] 2. By adding and setting an end-processing mechanism, this invention can not only achieve precise docking of the center components on both sides through the synchronous cross seat before welding the roller body, ensuring that the centering structure operates coaxially throughout the process and rotates synchronously with the two ends of the roller body, but also calibrate the parallelism of the protective end cap through the inner and outer double-layer alignment structure. The outer alignment seat is attached to the outer side of the protective end cap, while the inner alignment seat is driven by hydraulic transmission to hold the inner side of the protective end cap. Relying on the synergistic effect of the inner and outer sides, the tilt deviation of the protective end cap can be reliably corrected, ensuring the parallelism of the inner and outer sides of the protective end cap with the end face of the roller body. This processing method can completely solve the defect of parallelism that is difficult to guarantee in traditional processes, greatly improve the welding and assembly accuracy, optimize the overall structural stability of the idler roller, and thus extend the service life of the internal bearings of the idler roller and the whole machine.

[0018] 3. This invention adds and sets up a multi-segment welding mechanism. When welding the roller body, the mechanism adopts a segmented welding process. On the one hand, the roller body and the protective end cap are initially spot-welded and fixed by a spot welding gun, which can effectively prevent the protective end cap from shifting in position in subsequent processes and ensure the welding position is accurate and stable. On the other hand, the continuous operation of spot welding and circumferential welding is realized by switching work stations. Before circumferential welding, the spot welding area is pre-cooled and shaped by high-pressure airflow, which can not only consolidate the spot welding effect, but also reduce the initial temperature of the workpiece and reduce thermal deformation during circumferential welding. This processing method, by first spot welding for positioning and then circumferential welding for reinforcement, makes the weld bead uniform and the connection firm. At the same time, it simplifies the welding process, improves the continuity of processing, avoids roller operation failures caused by insufficient welding precision, and meets the needs of automated and efficient production.

[0019] 4. By adding and setting a scale-free cooling mechanism, this invention not only enables online correction of thermal deformation after the roller body is welded, but also corrects the circumferential accuracy of the roller body through the coordinated extrusion of multiple sets of rollers. Furthermore, it employs a gas-liquid two-phase atomization method to gently cool the weld area, leaving no liquid residue during the cooling process. This prevents micro-cracks from forming in the workpiece due to sudden cooling and also prevents coolant from entering the bearing and causing contamination. Moreover, a closed-loop control system is formed between the temperature sensor and the controller, allowing precise adjustment of cooling parameters based on the actual roller body temperature and correction rhythm. This ensures a perfect match between the cooling rate and the shaping process, enabling rapid weld shaping, eliminating residual welding stress, further guaranteeing the finished roller's accuracy, improving weld fatigue resistance, and effectively extending the overall service life of the roller. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a partial structural diagram of the workstation adjustment seat of the present invention; Figure 5 This is a partial structural diagram of the arc-shaped support of the present invention; Figure 6 This is a partial structural diagram of the rotating seat of the present invention; Figure 7 This is a partial structural diagram of the central rod of the present invention; Figure 8 This is a cross-sectional view of the internal structure of the central rod of the present invention; Figure 9 This is a partial structural diagram of the lifting seat of the present invention.

[0021] The components include: 1. Concave table; 2. Workstation adjustment seat; 3. Support frame; 4. Lifting seat; 5. Opening; 6. Track groove; 7. PLC controller; 8. Synchronization seat; 9. Directional nozzle; 10. Drive motor one; 11. Side drive roller one; 12. Mounting seat one; 13. Molding roller; 14. Mounting seat two; 15. Hydraulic adjustment cylinder; 16. Mounting seat three; 17. Mounting base; 18. Arc-shaped support; 19. Liquid inlet metering valve; 20. Negative pressure gas-liquid mixing box; 21. Gas-liquid proportional regulating valve; 22. Inlet air flow regulating valve; 23. Eddy current displacement. 24. Sensor; 25. Ring welding gun; 26. Center rod; 27. Spot welding gun; 28. Arc-shaped magnetic moving seat; 29. ​​Outer alignment seat; 30. Temperature sensor; 31. Rotating seat; 32. Sealing mounting seat; 33. Drive motor II; 34. Synchronous cross seat; 35. Inner alignment seat; 36. Bottom drive roller; 37. Auxiliary rotating roller; 38. Grooving; 39. Same-pole magnetic part; 40. Different-pole magnetic part; 41. Return spring; 42. Top rod; 43. Piston seat; 44. Sealing liquid chamber; 45. Drive motor III; 46. Side drive roller II; 47. Sleeve. Detailed Implementation

[0022] The technical solutions in 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.

[0023] Please see the appendix Figure 1 -Appendix Figure 2 This invention provides a fully automatic circumferential seam welding machine for idler rollers, including a concave table 1. The bottom of the concave table 1 is provided with a support frame 3 for bottom isolation and support and fixation. The top of the concave table 1 is provided with two processing stations, namely a first station and a second station. The front and rear sides of the middle of the top of the concave table 1 are provided with track grooves 6 for station switching. The track grooves 6 are provided with station adjustment seats 2 that can move linearly back and forth. Please see the appendix Figure 4 -Appendix Figure 6 and attached Figure 9 A molding and centering mechanism is set on a concave table 1 and is used to perform circumferential molding of the roller body before welding and to center the protective end caps installed at both ends. The molding centering mechanism includes an arc-shaped support 18. An arc-shaped support 18 is provided at the top center of the workstation adjustment seat 2. Bottom drive rollers 35 are provided on both sides of the bottom of the arc groove of the arc-shaped support 18. A drive motor 32 for driving the bottom drive rollers 35 is provided on the upper middle part of one side of the arc-shaped support 18. Auxiliary rotating rollers 36 are provided at the four corners of the arc groove inside the arc-shaped support 18. Mounting bases 17 are provided on both sides of the top of the concave table 1. Multiple hydraulic adjustment cylinders 15 are equidistantly provided on both sides of the top of the concave table 1. The top of the rod of the hydraulic adjustment cylinder 15 is connected to the corresponding position of the bottom end of the mounting base 17 on the same side. Mounting seat 3 16 is fixedly connected to one side of the bottom center of the mounting base 17. Molding rollers 13 are rotatably connected to the bottom center of the mounting seat 3 16.

[0024] When the molding and centering mechanism is started, the station adjustment seat 2 is stably positioned at the first station position on the concave table 1. The operator places the roller to be processed smoothly into the arc-shaped support 18 on the station adjustment seat 2. The arc-shaped fitting structure of the arc-shaped support 18 provides precise support for the roller, ensuring that the roller does not shift after placement. At the same time, the rolling contact design of the auxiliary rotating roller 36 on the arc-shaped support 18 effectively reduces the contact area and frictional resistance between the outer wall of the roller and the inner wall of the arc-shaped support 18, facilitating the subsequent rotation adjustment and position calibration of the roller. Subsequently, the operator preliminarily attaches the protective end caps to be welded to both ends of the roller, ensuring that the protective end caps are initially aligned with the ends of the roller, thus successfully completing all the preparatory work before welding the roller.

[0025] Then, the hydraulic regulating cylinder 15 on the concave table 1 of the first work station is started synchronously. After the hydraulic regulating cylinder 15 is started, its rod retracts smoothly according to the preset stroke. During the retraction of the rod on the hydraulic regulating cylinder 15, the mounting base 17 fixedly connected to it is moved down synchronously. During the downward movement of the mounting base 17, the mounting seat 3 16 fixedly installed at its bottom and the molding roller 13 are moved down together until the surface of the molding roller 13 is tightly attached to the surface of the roller body placed on the arc support 18. Then, the rod of the hydraulic regulating cylinder 15 immediately stops retracting and maintains the current downward pressure state to achieve the initial limit of the roller body.

[0026] At the same time, the lifting seat 4, which is close to the opening 5 of the first work station, moves upward smoothly. During the upward movement, the lifting seat 4 drives the mounting seat 2 14 and the side drive roller 2 45 installed on it to move together. After the side drive roller 2 45 on the mounting seat 2 14 comes into close contact with the outer wall of the roller on the arc support 18 and achieves lateral limitation, the lifting seat 4 stops moving. At this time, the roller body is limited by the molding roller 13 and the side drive roller 2 45 to ensure that no deviation occurs during subsequent rotation.

[0027] The molding and centering mechanism also includes openings 5. Openings 5 ​​are provided on both sides of the top center of the concave platform 1. A lifting seat 4 that can move vertically is mirrored in the two openings 5. A mounting seat 2 14 is fixedly connected to the upper center of one side of the lifting seat 4. A side drive roller 2 45 is rotatably connected to the center of the mounting seat 2 14. A drive motor 3 44 is provided on the center of one side of the mounting seat 2 14 to drive the side drive roller 2 45 to rotate. A mounting seat 1 12 is fixedly connected to the center of both sides of the inner wall of the top of the concave platform 1. A side drive roller 11 is provided on the center of the adjacent side of the mounting seat 12. A drive motor 10 is provided on the center of one side of the mounting seat 12 to drive the side drive roller 11 on the same side to rotate.

[0028] Then, the second drive motor 32 on the arc-shaped support 18 starts. After starting, the second drive motor 32 precisely drives the bottom drive roller 35 on the arc-shaped support 18 to rotate at a constant speed through the transmission structure. During the rotation, the bottom drive roller 35 drives the roller on the arc-shaped support 18 to rotate synchronously and at a constant speed through the friction between it and the bottom of the roller body. At the same time, the third drive motor 44 on the lifting seat 4 near the first work station starts synchronously. After starting, the third drive motor 44 drives the second side drive roller 45 on the mounting seat 14 to rotate synchronously. During the rotation, the second side drive roller 45 assists in driving the roller on the arc-shaped support 18 to rotate synchronously through the friction between it and the side of the roller body.

[0029] At the same time, the drive motor 10 on the mounting base 12 near the first work station also starts synchronously. After starting, the drive motor 10 drives the side drive roller 11 on it to rotate at a constant speed. During the rotation, the side drive roller 11 also drives the roller on the arc support 18 to rotate synchronously through friction. Through the coordinated drive of the bottom drive roller 35, the side drive roller 45 and the side drive roller 11 in three directions, it is ensured that the roller on the arc support 18 can rotate smoothly and at a constant speed, providing stable conditions for subsequent inspection and shaping.

[0030] During the process of driving the roller on the arc-shaped support 18 to rotate through three directions, the eddy current displacement sensor 23 on the synchronous seat 8 is activated synchronously to detect the concentricity of the roller in real time and accurately, and to capture the radial deviation of the roller during rotation in a timely manner to ensure the rotation accuracy of the roller. At the same time, during the rotation of the roller on the arc-shaped support 18, it will be shaped by the shaping roller 13 on the mounting seat 3 16 before processing. The shaping roller 13 corrects the small deformation of the roller surface by making close contact with the rotating roller surface, thereby ensuring the circumference of the roller before welding processing and ensuring the installation and welding accuracy of the subsequent protective end cap. After the concentricity of the roller is qualified and the shaping is completed, each drive motor stops running synchronously, and the driving rotation of the roller on the arc-shaped support 18 is stopped.

[0031] Please see the appendix Figure 7 -Appendix Figure 9 The molding centering mechanism also includes a synchronous seat 8. Both sides of the top center of the station adjustment seat 2 are provided with synchronous seats 8 that move linearly in opposite directions. Both ends of the lower inner side of the synchronous seat 8 are provided with eddy current displacement sensors 23 to monitor the concentricity of the roller during rotation. The middle of the adjacent side of the synchronous seat 8 is rotatably connected to a rotating seat 30. The middle of the rotating seat 30 is fixedly connected to a sleeve 46. Multiple slots 37 are arranged in a circular array on one side of the middle of the sleeve 46. Arc-shaped magnetic moving seats 27 are slidably connected in the slots 37. The inside of the sleeve 46 is slidably connected to a central rod 25. The outer wall of the central rod 25 is composed of two opposite magnetic parts 39 and a middle same magnetic part 38.

[0032] Then the synchronous seat 8 on the workstation adjustment seat 2 is started. After starting, the synchronous seat 8 moves smoothly to both ends of the roller body on the arc support 18 according to the preset trajectory. During the movement, the synchronous seat 8 drives the sleeve 46 and the center rod 25 fixedly installed on it to be slowly inserted into the inside of the roller body through the openings of the bearing seats at both ends of the roller body, ensuring that the sleeve 46 and the center rod 25 do not collide with the inner wall of the roller body and the bearing seat during the insertion process.

[0033] As the synchronous seats 8 on the workstation adjustment seat 2 continue to move, the distance between the two synchronous seats 8 shortens synchronously. When the ends of the two center rods 25 come into contact with each other, the synchronous seats 8 continue to move towards the center. Both center rods 25 are subjected to mutual squeezing force and move smoothly into the sleeve 46 on their respective sides. During the movement of the center rods 25, the dissimilar magnetic parts 39 on the center rods 25 that originally corresponded to the slots 37 on the sleeves 46 are replaced by the same magnetic parts 38 as the center rods 25 move. The dissimilar magnetic attraction force generated by the dissimilar magnetic parts 39 on the arc-shaped magnetic moving seat 27 in the slots 37 is reduced. The force is transformed into a repulsive force between the same magnetic part 38 and the arc-shaped magnetic moving seat 27. This repulsive force synchronously pushes the arc-shaped magnetic moving seats 27 in the slots 37 at various positions on the sleeve 46 to move outward synchronously. Since the sleeve 46 on the synchronous seat 8 is always at the center of the roller body, the arc-shaped magnetic moving seats 27 at various positions on the sleeve 46 can accurately calibrate and center the protective end caps at the center of both ends of the roller body, ensuring that the protective end caps are always accurately at the center of both ends of the roller body, providing a reliable guarantee for the subsequent positioning and welding of the protective end caps on the roller body.

[0034] Please see the appendix Figure 6 -Appendix Figure 8 An end-processing mechanism, which is set on the workstation adjustment seat 2, is used to calibrate the parallelism between the end face of the roller body after being processed by the molding centering mechanism and the end face of the protective end cover. The end processing mechanism includes a synchronous cross seat 33. One end of a central rod 25 is fixedly connected to the synchronous cross seat 33. Another central rod 25 has a cross groove at the middle of its end near the synchronous cross seat 33 that matches the shape and size of the synchronous cross seat 33. Multiple outer alignment seats 28 are arranged in a circular array on one side of the middle part of the outer wall of the sleeve 46.

[0035] When the end processing mechanism is started, after the molding centering mechanism accurately positions the protective end caps at both ends of the roller body to the center position at both ends of the roller body, the synchronous seat 8 on the station adjustment seat 2 continues to move synchronously towards the center. During the movement of the synchronous seat 8, the sleeve 46 and the center rod 25 on it are driven to move towards the center together. During the movement of the center rod 25, the synchronous cross seat 33 at its end is accurately inserted into the corresponding cross groove on the other side of the center rod 25. Through the cross positioning structure, the coaxiality of the sleeve 46 and the center rod 25 during the movement can be ensured to avoid offset. At the same time, it can also ensure that when the roller body on the arc support 18 is driven to rotate, the rotation angle of both ends of the roller body remains synchronous, preventing the protective end caps from shifting due to asynchronous rotation at both ends.

[0036] The end processing mechanism also includes a sealing mounting seat 31. Multiple sealing mounting seats 31 are arranged in a circumferential array on one side of the middle portion of the outer wall of the central rod 25. Each sealing mounting seat 31 has an inner alignment seat 34 that is driven to rise and fall by liquid. A sealing liquid cavity 43 is opened on one side of the inner portion of the central rod 25. The sealing liquid cavity 43 is completely filled with hydraulic oil. A piston seat 42 is arranged inside the sealing liquid cavity 43. A push rod 41 is arranged in the middle portion of the piston seat 42. The other end of the push rod 41 passes through the central rod 25 and is connected to the middle portion of the inner end of the sleeve 46. A return spring 40 is sleeved on the outer wall of the push rod 41. The two ends of the return spring 40 are connected to the corresponding positions of the sleeve 46 and the central rod 25, respectively.

[0037] As the synchronous seat 8 moves synchronously toward the center, the outer alignment seats 28 at various positions on the sleeve 46 gradually come into close contact with the outer surfaces of the protective end caps at both ends of the roller. Through the planar contact of the outer alignment seats 28, the parallelism between the outer surface of the protective end cap and the end faces of both ends of the roller is precisely aligned and adjusted, correcting the tilt deviation of the protective end cap.

[0038] Simultaneously, as the sleeve 46 continues to move, the push rod 41 inside the sleeve 46 moves synchronously. During the movement of the push rod 41, it drives the piston seat 42 fixedly connected to it to move synchronously and smoothly in the sealing liquid cavity 43 inside the center rod 25. When the piston seat 42 is driven to move by the push rod 41, it squeezes the hydraulic oil in the sealing liquid cavity 43, causing the hydraulic oil in the sealing liquid cavity 43 to enter the sealing mounting seat 31 under pressure, and exerts a squeezing force on the inner alignment seat 34 inside the sealing mounting seat 31, smoothly squeezing the inner alignment seat 34 out of the sealing mounting seat 31. The inner alignment seat 34 extending out of the sealing mounting seat 31 comes into close contact with the inner side of the protective end cover during the subsequent continuous movement of the sleeve 46, and precisely aligns and adjusts the parallelism between the two ends of the roller body and the inner side of the protective end cover.

[0039] Since the outer alignment seat 28 and the sealing mounting seat 31 and the inner alignment seat 34 always maintain a preset parallel relationship, the parallelism between the inner and outer sides of the protective end cap on the roller body and the end face of the roller body can be reliably guaranteed through the synergistic effect of the outer alignment seat 28 and the inner alignment seat 34. This ensures the welding accuracy of the roller body and its protective end cap during the welding process, as well as the forming effect of the finished roller after processing. This allows for the smooth completion of the parallelism alignment and adjustment of the end face of the roller body and the surfaces of the protective end caps on both sides.

[0040] Please see the appendix Figure 3 and attached Figure 6 A multi-segment welding mechanism is set on a concave table 1 and is used to perform segmented welding processing on the roller body after the end processing mechanism and the end caps on both ends of the roller. The multi-segment welding mechanism includes spot welding guns 26. Spot welding guns 26 are provided on both sides of the middle part of the inner wall of the top of the concave table 1 to perform intermittent spot welding around the connection of the roller body and the protective end cap. A ring welding gun 24 is provided on the upper middle part of the adjacent side of the synchronous seat 8 to perform continuous welding at the connection of the roller body and the protective end cap.

[0041] When the multi-segment welding mechanism is started, the roller at the first station on the concave table 1 has completed the concentricity calibration and parallelism adjustment of the roller and the protective end caps at both ends through the molding centering mechanism and the end processing mechanism. Then, the multi-directional drive operation of the roller on the arc support 18 is started again, so that the roller and the protective end cap on it in the arc support 18 at the first station rotate synchronously at a slow and uniform speed to ensure that the weld is uniform during the welding process. During the synchronous rotation of the roller and the protective end cap, the spot welding gun 26 on the concave table 1 is started synchronously. The spot welding gun 26 performs uniform electric welding on the connection between the roller and the protective end cap according to the preset spot welding spacing and strength. The spot welding initially welds and fixes the roller and the protective end caps at both ends to prevent the protective end caps from shifting position during subsequent movement and circumferential welding.

[0042] After the initial spot welding is completed, the hydraulic adjusting cylinder 15 on the concave table 1 and the lifting seat 4 in the opening 5 are simultaneously reset to their initial state, releasing the limit on the roller. Then, the operator issues a command through the control equipment to control the station adjusting seat 2 to move smoothly in the track groove 6 on the concave table 1, so that the roller on the station adjusting seat 2, after the initial welding and positioning, is precisely moved to the second station position on the concave table 1. After the roller is stably in place, the hydraulic adjusting cylinder 15 and the lifting seat 4 near the second station on the concave table 1 are simultaneously reset to the working state of the first station, and the roller is precisely limited again, providing stable support for subsequent circumferential welding and cooling treatment.

[0043] Then, the roller in the second station rotates slowly and evenly again through multi-directional drive. During its continuous rotation, the directional nozzle 9 on the concave table 1 is activated, and the directional nozzle 9 sprays high-pressure gas at the spot welding position at the end of the roller to quickly cool down the welding area. This cooling operation can, on the one hand, quickly cool down and solidify the spot welding position of the roller, consolidate the spot welding fixation effect, and prevent the weld from deforming due to failure to cool down and solidify. On the other hand, it can effectively reduce the initial temperature of the roller during subsequent circumferential welding, avoiding thermal deformation of the roller and protective end cap due to excessive temperature during circumferential welding, which would affect the welding accuracy. After the spot welding positions at both ends of the roller return to normal temperature, the circumferential welding gun 24 on the synchronous seat 8 is activated. During the uniform rotation of the roller, the circumferential welding gun 24 performs uniform and continuous circumferential welding processing at the connection position between the roller and the protective end cap. By first spot welding to fix and then circumferential welding to reinforce, the weld is ensured to be tight and firm, thus completing the segmented welding processing of the roller.

[0044] Please see the appendix Figure 1 -Appendix Figure 2 The scale-free cooling mechanism is set on the concave table 1 and is used to perform scale-free cooling and shaping treatment on the idler rollers after the multi-section welding mechanism has been processed.

[0045] The scale-free cooling mechanism includes directional nozzles 9. Two directional nozzles 9 are equidistantly arranged on the side wall of the top of the concave table 1 away from the spot welding gun 26. Temperature sensors 29 for monitoring the temperature of the connection between the roller body and the protective end cover are arranged on the upper middle part of the adjacent side of the synchronous seat 8. A PLC controller 7 is arranged in the middle of one side of the front end of the concave table 1.

[0046] When the scale-free cooling mechanism is started, the ring weld positions at both ends of the roller body are in a high temperature state after the welding is completed. If the temperature is not cooled in time, thermal deformation is very likely to occur, affecting the accuracy of the finished roller. The roller body in the second station continues to rotate slowly and uniformly under multi-directional drive operation to ensure uniform cooling and correction. During the rotation of the roller body, the eddy current displacement sensor 23 on the synchronous seat 8 is started again to detect the circumference of the outer wall of the roller body after welding in real time and capture the thermal deformation caused by high temperature ring welding in time.

[0047] When thermal deformation of the roller is detected, the eddy current displacement sensor 23 immediately transmits the detection result to the PLC controller 7. The PLC controller 7 quickly analyzes and processes the detection data and controls the rod of the hydraulic regulating cylinder 15 on the second station to retract again. During the retraction of the rod of the hydraulic regulating cylinder 15, it drives the mounting base 16 at its bottom and the molding roller 13 to move down synchronously, so that the molding roller 13 generates uniform extrusion force on the roller surface on the arc support 18. Then, through the coordinated action of the molding roller 13, the side drive roller 11 and the side drive roller 2 45, the roller on the arc support 18 that has been deformed after high-temperature ring welding is precisely corrected during rotation, and the circumferential accuracy of the roller is gradually restored.

[0048] The scale-free cooling mechanism also includes a negative pressure gas-liquid mixing box 20. The negative pressure gas-liquid mixing box 20 is located in the middle of one side of the outer wall of the concave platform 1. The negative pressure gas-liquid mixing box 20 is connected to the interior of the directional nozzle 9 through internal flow channels. A liquid metering valve 19 is located in the middle of one side of the negative pressure gas-liquid mixing box 20. An air flow regulating valve 22 is located in the middle of the other side of the negative pressure gas-liquid mixing box 20. A gas-liquid ratio regulating valve 21 is located in the middle of the top of the negative pressure gas-liquid mixing box 20.

[0049] Furthermore, during the roller body calibration process, high-pressure gas enters the negative pressure gas-liquid mixing box 20 precisely according to the preset flow rate through the inlet flow regulating valve 22, while cooling liquid enters the negative pressure gas-liquid mixing box 20 according to the preset ratio through the liquid metering valve 19. Under the action of the Venturi negative pressure effect inside the box, the high-pressure gas and cooling liquid entering the negative pressure gas-liquid mixing box 20 are torn and broken by the high-speed airflow, forming uniform micron-level fine droplets, thereby forming a uniform gas-liquid two-phase atomization state in the negative pressure gas-liquid mixing box 20, ensuring uniform cooling and no liquid accumulation.

[0050] Then, the atomized cooling medium in the negative pressure gas-liquid mixing box 20 is precisely delivered to the directional nozzle 9 through the internal flow channel of the box. The directional nozzle 9 accurately sprays the atomized cooling medium onto the weld area between the roller and the protective end cover, as well as the weld transition area between the protective end cover and the roller, ensuring precise cooling without affecting other parts of the roller. After the fine droplets are sprayed out, they vaporize rapidly upon contact with the surface of the high-temperature workpiece, quickly absorbing the heat from the workpiece surface. At the same time, the fine droplets themselves completely vaporize and evaporate, leaving no liquid accumulation on the workpiece surface. This completes the rapid, uniform, and gentle cooling treatment of the weld area and transition area, avoiding micro-cracks caused by sudden cooling.

[0051] During this process, the temperature sensor 29 on the synchronous seat 8 collects the temperature information data of the roller in real time and transmits the collected temperature data to the PLC controller 7 in real time. After receiving the temperature data information, the PLC controller 7 immediately performs real-time calculation and analysis. Based on the actual temperature of the roller, the cooling requirements and the correction rhythm, it adjusts the gas-liquid mixing ratio, the spray flow rate of the atomized cooling medium and the spray angle of the directional nozzle 9 in real time through the gas-liquid ratio regulating valve 21, the liquid metering valve 19 and the air flow regulating valve 22 on the negative pressure gas-liquid mixing box 20. This ensures that the cooling rate is precisely matched with the correction and shaping rhythm of the roller, which not only ensures the cooling and shaping effect, but also avoids workpiece damage caused by excessive cooling. In this way, the scale-free cooling and shaping treatment of the idler roller after welding is successfully completed, ensuring the accuracy and service life of the finished idler roller.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully automatic circumferential seam welding machine for idler rollers, characterized in that, include, A concave platform (1) is provided at the bottom of the concave platform (1) with a support frame (3) for bottom isolation and support fixation. The top of the concave table (1) is provided with two processing stations, namely the first station and the second station. The front and rear sides of the middle part of the top of the concave table (1) are provided with track grooves (6) for station switching. The track grooves (6) are provided with station adjustment seats (2) that can move linearly back and forth. A molding and centering mechanism is set on a concave table (1) for circumferential molding of the roller body before welding and centering of the protective end caps installed at both ends. The end processing mechanism is set on the workstation adjustment seat (2) and is used to calibrate the parallelism between the end face of the roller body after the plastic molding centering mechanism and the end face of the protective end cover. A multi-segment welding mechanism is set on a concave table (1) for segmented welding processing of the roller body after the end processing mechanism and the end caps on both ends of the roller body. The scale-free cooling mechanism is set on the concave table (1) and is used to perform scale-free cooling and shaping treatment on the idler rollers after the multi-section welding mechanism is processed.

2. The fully automatic circumferential seam welding machine for idler rollers according to claim 1, characterized in that, The molding centering mechanism includes an arc-shaped support (18). The arc-shaped support (18) is provided at the top center of the workstation adjustment seat (2). Bottom drive rollers (35) are provided on both sides of the bottom of the arc groove of the arc-shaped support (18). A second drive motor (32) for driving the bottom drive rollers (35) is provided on the upper middle part of one side of the arc-shaped support (18). Auxiliary rotating rollers (36) are provided at the four corners of the arc groove inside the arc-shaped support (18). The concave shape Mounting bases (17) are provided on both sides of the top of the platform (1). Multiple hydraulic adjustment cylinders (15) are provided at equal intervals on both sides of the top of the concave platform (1). The top of the rod of the hydraulic adjustment cylinder (15) is connected to the bottom of the mounting base (17) on the same side. Mounting seat three (16) is fixedly connected to one side of the bottom center of the mounting base (17). A molding roller (13) is rotatably connected to the bottom center of the mounting seat three (16).

3. The fully automatic circumferential seam welding machine for idler rollers according to claim 2, characterized in that, The molding centering mechanism also includes an opening (5). An opening (5) is provided on both sides of the top center of the concave platform (1). A lifting seat (4) that can move vertically is mirrored in the two openings (5). A mounting seat two (14) is fixedly connected to the upper part of one side of the lifting seat (4). A side drive roller two (45) is rotatably connected to the middle of the mounting seat two (14). A drive motor three (44) for driving the side drive roller two (45) is provided on the middle of one side of the mounting seat two (14). A mounting seat one (12) is fixedly connected to the middle of both sides of the inner wall of the top of the concave platform (1). A side drive roller one (11) is provided on the middle of the adjacent side of the mounting seat one (12). A drive motor one (10) for driving the side drive roller one (11) on the same side is provided on the middle of one side of the mounting seat one (12).

4. The fully automatic circumferential seam welding machine for idler rollers according to claim 3, characterized in that, The molding centering mechanism also includes a synchronous seat (8). Both sides of the top center of the work station adjustment seat (2) are provided with synchronous seats (8) that move in opposite directions or in a straight line. Both ends of the lower inner side of the synchronous seat (8) are provided with eddy current displacement sensors (23) for monitoring the concentricity of the roller during rotation. The middle of the adjacent side of the synchronous seat (8) is rotatably connected to a rotating seat (30). The middle of the rotating seat (30) is fixedly connected to a sleeve (46). The middle side of the sleeve (46) has multiple slots (37) arranged in a circular array. The slots (37) are slidably connected to an arc-shaped magnetic moving seat (27). The inside of the sleeve (46) is slidably connected to a central rod (25). The outer wall of the central rod (25) is composed of two opposite magnetic parts (39) and a middle same magnetic part (38).

5. The fully automatic circumferential seam welding machine for idler rollers according to claim 4, characterized in that, The end processing mechanism includes a synchronous cross seat (33), one of the central rods (25) is fixedly connected to the middle of one end of the synchronous cross seat (33), and the other central rod (25) has a cross groove at the middle of one end near the synchronous cross seat (33) that matches the shape and size of the synchronous cross seat (33). Multiple outer alignment seats (28) are arranged in a circular array on one side of the middle part of the outer wall of the sleeve (46).

6. The fully automatic circumferential seam welding machine for idler rollers according to claim 5, characterized in that, The end processing mechanism also includes a sealing mounting seat (31). Multiple sealing mounting seats (31) are arranged in a circular array on one side of the middle part of the outer wall of the central rod (25). The interior of each sealing mounting seat (31) is provided with an inner alignment seat (34) that is driven to rise and fall by liquid. A sealing liquid cavity (43) is opened on one side of the interior of the central rod (25). The sealing liquid cavity (43) is completely filled with hydraulic oil. A piston seat (42) is provided inside the sealing liquid cavity (43). A push rod (41) is provided in the middle of the piston seat (42). The other end of the push rod (41) passes through the central rod (25) and is connected to the middle of the inner end of the sleeve (46). A return spring (40) is sleeved on the outer wall of each push rod (41). The two ends of the return spring (40) are connected to the corresponding positions of the sleeve (46) and the central rod (25).

7. The fully automatic circumferential seam welding machine for idler rollers according to claim 4, characterized in that, The multi-segment welding mechanism includes spot welding guns (26). Spot welding guns (26) for intermittent spot welding are provided on both sides of the middle part of the inner wall of the top of the concave table (1) and the connection of the roller body and the protective end cap are provided. A ring welding gun (24) for continuous welding is provided on the middle and upper part of the adjacent side of the synchronous seat (8).

8. The fully automatic circumferential seam welding machine for idler rollers according to claim 7, characterized in that, The scale-free cooling mechanism includes directional nozzles (9). Two directional nozzles (9) are equidistantly arranged on the side wall of the top of the concave table (1) away from the spot welding gun (26). Temperature sensors (29) for monitoring the temperature of the connection between the roller body and the protective end cover are arranged on the upper middle part of the adjacent side of the synchronous seat (8). A PLC controller (7) is arranged on the middle part of one side of the front end of the concave table (1).

9. The fully automatic circumferential seam welding machine for idler rollers according to claim 8, characterized in that, The scale-free cooling mechanism also includes a negative pressure gas-liquid mixing tank (20). A negative pressure gas-liquid mixing tank (20) is provided in the middle of one side of the outer wall of the concave platform (1). The negative pressure gas-liquid mixing tank (20) is connected to the interior of the directional nozzle (9) through the internal flow channel. A liquid metering valve (19) is provided in the middle of one side of the negative pressure gas-liquid mixing tank (20). An air flow regulating valve (22) is provided in the middle of the other side of the negative pressure gas-liquid mixing tank (20). A gas-liquid ratio regulating valve (21) is provided in the middle of the top of the negative pressure gas-liquid mixing tank (20).

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