A large energy-saving rotary kiln cylinder joint longitudinal seam edge correction device and method

Abstract

This invention discloses a device and method for correcting longitudinal misalignment of a large-scale energy-saving rotary kiln section. The upper end of the piston rod of a vertically lifting hydraulic cylinder mounted on the base is connected to the lower end of a crossbeam. Both ends of the crossbeam are equipped with an axial misalignment correction mechanism and a radial misalignment correction mechanism, respectively. The radial misalignment correction mechanism includes a radial adjusting hydraulic cylinder and a radial correction connecting rod. U-shaped clips installed at both ends of the radial correction connecting rod are respectively engaged with the inner and outer walls of the kiln section, achieving radial push-pull correction and alignment of the upper and lower edges of the longitudinal joint. The longitudinal joint axial misalignment correction mechanism includes an axial adjusting hydraulic cylinder and an axial correction connecting rod. The axial correction connecting rod presses against the end face of the kiln section to achieve axial misalignment correction and alignment of the longitudinal joint. This invention can achieve simultaneous correction and alignment of radial and axial misalignment of the longitudinal joint, while precisely controlling the uniformity of the longitudinal joint gap width, improving the manufacturing precision and welding quality of the kiln section, reducing manual labor intensity, and increasing production efficiency.

Description

Technical Field

[0001] This invention relates to a large rotary kiln manufacturing technology, and in particular to a device and method for correcting misalignment of longitudinal seams in a large energy-saving rotary kiln section. Background Technology

[0002] Large-scale energy-saving rotary kilns are core equipment in industries such as metallurgy, building materials, and chemicals. Their cylinders are composed of multiple sections welded together. The manufacturing precision of these sections directly determines the overall operational stability, service life, safe production, and energy-saving effect of the rotary kiln. One of the core processes in cylinder manufacturing is plate rolling. After rolling, longitudinal seam welding (the butt joint of a single cylinder section's rolled plate) is required. The radial and axial misalignment of the longitudinal seam, as well as the consistency of the seam gap width, are key factors affecting welding quality. Radial misalignment refers to the vertical misalignment of the cylinder sections on both sides of the longitudinal seam in the radial direction (radial direction), while axial misalignment refers to the longitudinal misalignment of the cylinder sections on both sides of the longitudinal seam in the axial direction (length direction). Both types of misalignment can lead to welding stress concentration, incomplete penetration, and other defects, seriously affecting the structural strength and sealing of the cylinder.

[0003] Currently, the main technical challenges in correcting misalignment (radial and axial) and controlling gaps in the longitudinal seams after the roll plates of large energy-saving rotary kiln sections are as follows: 1. Low efficiency and poor accuracy of misalignment correction: In the existing technology, the correction of radial and axial misalignment of longitudinal seams is mostly carried out separately. It requires manual adjustment with different correction tools (such as jacks, pressure plates, hand hoists, etc.), which is cumbersome, time-consuming and labor-intensive. Moreover, the correction accuracy depends on the operator's experience, making it difficult to ensure that the misalignment is controlled within the design tolerance range (usually the misalignment is required to be no more than 8% of the thickness of the steel plate at that point, and the maximum value is no more than 3mm). This can easily lead to the roundness and straightness of the cylinder after welding exceeding the standard, affecting the subsequent assembly and operational stability.

[0004] 2. Difficulty in uniformly controlling the width of longitudinal seams: After the cylinder section is rolled, the width of the longitudinal seams is prone to vary. The existing correction device lacks a dedicated gap width positioning and adjustment mechanism, and mostly relies on manual visual inspection or simple feeler gauges for adjustment. It is impossible to achieve precise and uniform control of the gap width throughout the entire length of the longitudinal seam, which can easily lead to defects such as incomplete penetration and slag inclusion during welding, affecting the welding strength and sealing performance, and increasing the amount of subsequent rework.

[0005] 3. The cylinder section is prone to deformation during the correction process: Large rotary kiln cylinder sections are large in volume and heavy in weight (a single cylinder section can weigh several tons to tens of tons). After rolling, the rigidity of the cylinder itself is insufficient. If the force is uneven during the correction process, local deformation or overall ellipticity deviation is likely to occur, which further reduces the manufacturing precision of the cylinder section. At the same time, most of the existing devices are temporary fixed structures, which cannot stably clamp the cylinder section. The cylinder section is prone to displacement during the correction process, which affects the correction effect.

[0006] 4. Poor versatility: Existing correction devices are mostly designed for cylinder sections of specific specifications (diameter, thickness). When the specifications of the cylinder section change, the entire set of correction tools needs to be replaced, resulting in poor adaptability, increased manufacturing costs and operational complexity. Moreover, existing devices can only correct a single type of misalignment (radial or axial), and cannot simultaneously correct radial and axial misalignments of longitudinal seams, further reducing production efficiency.

[0007] 5. Lack of effective detection and feedback mechanism: In the existing calibration process, the detection of radial misalignment, axial misalignment and gap width is mostly done manually and intermittently. It is impossible to provide real-time feedback on the calibration effect, which can easily lead to over-calibration or under-calibration. Moreover, it is difficult to achieve accurate control throughout the process, resulting in unstable calibration quality and failing to meet the high-precision manufacturing requirements of large rotary kiln sections. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a large-scale energy-saving rotary kiln section longitudinal seam misalignment correction device and method that is reasonably designed, highly versatile, easy to operate and has high correction accuracy.

[0009] The technical solution of this invention is: A large energy-saving rotary kiln section longitudinal joint misalignment correction device includes a base, a vertical lifting hydraulic cylinder is provided at the upper end of the base, the upper end of the piston rod of the vertical lifting hydraulic cylinder is connected to the lower end of a crossbeam, and the left and right ends of the crossbeam are respectively provided with an axial misalignment correction mechanism and a radial misalignment correction mechanism. The radial misalignment correction mechanism includes a radial adjustment hydraulic cylinder and a radial correction connecting rod. The radial adjustment hydraulic cylinder is mounted on the crossbeam, and its piston rod extends and retracts radially along the cylinder section. The outer end of the piston rod is hinged to the inner side of the radial correction connecting rod through a first pin. U-shaped clips are respectively installed at the upper and lower ends of the radial correction connecting rod. The U-shaped clips are respectively clipped on the inner and outer walls of the cylinder section to realize radial push-pull correction and alignment of the upper and lower edges of the longitudinal seam. The longitudinal seam axial misalignment correction mechanism includes an axial adjustment hydraulic cylinder and an axial correction connecting rod. The axial adjustment hydraulic cylinder is installed at the end of the crossbeam, and its piston rod extends and retracts along the axial direction of the cylinder section. The piston of the axial adjustment hydraulic cylinder is hinged to the inner side of the axial correction connecting rod through a second pin. The axial correction connecting rod presses against the end face of the cylinder section to achieve the correction and alignment of the longitudinal seam axial misalignment.

[0010] Furthermore, the upper and lower ends of the radial correction link are respectively provided with shaft holes, and one side post of the U-shaped clip is inserted into the shaft hole, and the two are clearance fit, which allows for disassembly and assembly.

[0011] Furthermore: the radial correction link is a V-shaped plate structure, with its middle corner hinged to the crossbeam via a third pin, and the outer end of the piston rod of the radial adjustment hydraulic cylinder hinged to one side plate of the radial correction link via a first pin. The radial correction link, the third pin, and the radial adjustment hydraulic cylinder together constitute a lever-type motion mechanism.

[0012] Furthermore: a groove is provided in the middle of the plate at the middle corner of the radial correction link, the support plate on the crossbeam is located in the groove, the third pin is provided through the groove, the side wall and the support plate, two ear plates are provided on one side plate of the radial correction link, the outer end of the piston rod of the radial adjustment hydraulic cylinder is located between the two ear plates, and the second pin is provided through the ear plates and the piston rod.

[0013] Furthermore: the axial correction link is an equilateral triangular plate structure, with a groove in the middle of the plate at its apex. The outer end of the piston rod of the axial adjustment hydraulic cylinder is located in the groove. A second pin is provided through the side wall of the groove and the piston rod. Arc-shaped surfaces are provided at the two bottom corners of the axial correction link.

[0014] Furthermore: the base is welded from channel steel, and its bottom is equipped with locking rollers for easy movement to the side of the longitudinal seam of the cylinder section that needs to be corrected; the vertical lifting hydraulic cylinder is a single-stage telescopic hydraulic cylinder or a multi-stage telescopic hydraulic cylinder; there are two vertical lifting hydraulic cylinders arranged at intervals, or there is one vertical lifting hydraulic cylinder, in which case a guide mechanism is provided between the crossbeam and the base.

[0015] A method for correcting misalignment of longitudinal seams in a large energy-saving rotary kiln section using any of the aforementioned large energy-saving rotary kiln section longitudinal seam correction devices includes the following steps: Step 1: Adjust the position of the cylinder section: Use a plate rolling machine to adjust the longitudinal seam of the cylinder section to a horizontal position to facilitate the operation of the next process; Step 2: Adjust the position of the entire longitudinal joint misalignment correction device: Move the entire longitudinal joint misalignment correction device to a suitable position next to the longitudinal joint, and raise the center of the crossbeam to a position flush with the longitudinal joint by activating the vertical lifting hydraulic cylinder. Step 3: Perform radial misalignment correction of the longitudinal joint: Start the radial misalignment correction mechanism of the longitudinal joint, and detect the radial misalignment of the longitudinal joint in real time through the radial misalignment measurement template. According to the detection data, adjust the extension and retraction of the radial adjustment hydraulic cylinders at both ends, and drive the radial correction connecting rod and U-shaped clamp to perform radial pressure adjustment on the edges of the cylinder sections on both sides of the longitudinal joint until the radial misalignment of the longitudinal joint is controlled within the design tolerance range. Step 4: Perform longitudinal joint axial misalignment correction: Start the longitudinal joint axial misalignment correction mechanism, and drive the axial correction pressure plate to axially push and adjust the edges of the cylinder on both sides of the longitudinal joint by adjusting the extension and retraction of the axial adjustment hydraulic cylinder at one end of the cylinder section until the longitudinal joint axial misalignment meets the design requirements. Then stop the axial adjustment hydraulic cylinder to ensure the correction accuracy. Step 5: Check and fine-tune the gap width of the longitudinal joint: After the radial and axial misalignment of the longitudinal joint is corrected, check the gap width of the longitudinal joint throughout its entire length by checking the gap width. If there is a situation where the widths at both ends of the cylinder are different, adjust the traveling crane on the cylinder until the gap width of the longitudinal joint is uniform and consistent throughout its entire length and meets the design requirements. Step 6: Fixing and subsequent processes: After the correction is completed, the longitudinal seam position of the cylinder section is fixed by temporary spot welding or segment welding to prevent misalignment or changes in seam width during subsequent movement; loosen the correction mechanisms, unload the corrected cylinder section from the rolling machine, and transfer it to the welding process to complete the subsequent welding operation.

[0016] Furthermore: Preset the gap width of the longitudinal seam: When the gap at one end of the cylinder is smaller than the gap at the other end of the cylinder, the overhead crane on the cylinder clamps the upper edge of the end with the smaller gap in the longitudinal seam of the cylinder and gently lifts it upwards to make the gaps of the longitudinal seams at both ends of the cylinder the same.

[0017] Furthermore, due to errors in the actual longitudinal seam cutting, the measured gap is inaccurate. When actually inspecting the longitudinal seam dimensions of the weld, it is usually done by drawing straight lines on the upper and lower sides of the longitudinal seam on the cylinder wall to ensure that the two straight lines are parallel and the spacing meets the process requirements, thereby adjusting the width of the longitudinal seam.

[0018] Furthermore, in step 4, during the correction process, the radial misalignment data on the template is observed in real time to avoid over-correction or under-correction.

[0019] The beneficial effects of this invention are: 1. This invention, through the longitudinal seam radial misalignment correction mechanism and the longitudinal seam axial misalignment correction mechanism, can achieve synchronous correction and alignment of longitudinal seam radial misalignment and axial misalignment, while precisely controlling the consistent width of the longitudinal seam gap, improving the manufacturing accuracy and welding quality of the cylinder section, reducing manual labor intensity, and increasing production efficiency.

[0020] 2. This invention uses a vertical lifting hydraulic cylinder to control the entire longitudinal seam radial correction mechanism and axial correction mechanism to move up and down with the crossbeam. The adjustment is made according to the diameter of the cylinder section, so that the longitudinal seam radial correction mechanism and axial correction mechanism are exactly at the position of the longitudinal seam, thus adapting to the longitudinal seam correction of cylinder sections with different diameters.

[0021] 3. The present invention uses a U-shaped clip to clamp onto the inner and outer walls of the cylindrical section, and utilizes the lever effect formed by the radial adjustment hydraulic cylinder to achieve radial push-pull correction and alignment of the upper and lower edges of the longitudinal seam respectively.

[0022] 4. This invention has a high degree of intelligence, and can control the radial misalignment, axial misalignment, and longitudinal seam width data in real time, which is convenient for operators to observe and adjust intuitively; it improves the stability of the correction quality; the overall structure of the device is simple and the operation steps are clear, which is convenient for on-site operators to quickly master and use.

[0023] 5. The base of this invention is welded from channel steel, which has a stable structure and a long service life. At the same time, the layout of each mechanism is reasonable, the force is balanced, and the operation is stable. It can meet the high-intensity and high-frequency use requirements of manufacturing large rotary kiln cylinder sections of various specifications. Each adjusting hydraulic cylinder is hydraulically driven, with stable speed, which further improves the overall stability of the device. It is easy to promote and implement and has good economic benefits. Attached Figure Description

[0024] Figure 1 A three-dimensional diagram of the overall structure of a large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device; Figure 2 The diagram shows the rotary kiln section and plate rolling machine according to an embodiment of the present invention; Figure 3 for Figure 1 A schematic diagram of the radial misalignment correction mechanism; Figure 4 for Figure 1 Schematic diagram of the central axis misalignment correction mechanism; Figure 5 for Figure 4 Enlarged view of the central axis misalignment correction mechanism; Figure 6 for Figure 3 Enlarged view of the radial misalignment correction mechanism. Detailed Implementation

[0025] Example 1: See Figure 1 -- Figure 5 In the diagram, 1-cylinder section; 2-plate rolling machine; 3-base; 4-vertical lifting hydraulic cylinder; 5-crossbeam; 6-radial misalignment correction mechanism; 7-axial misalignment correction mechanism; 6-1-radial adjustment hydraulic cylinder; 6-2-first pin; 6-3-radial correction connecting rod; 6-4-U-shaped clip; 6-5-third pin; 7-1-axial adjustment hydraulic cylinder; 7-2-second pin; 7.3-axial correction connecting rod; 8-longitudinal seam.

[0026] In this embodiment, "up," "down," "left," and "right" are merely for the convenience of describing connection and positional relationships, and are not intended to limit the structure. Using different expressions still falls within the scope of protection of this invention.

[0027] A large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device includes a base 3, a vertical lifting hydraulic cylinder 4, a radial misalignment correction mechanism 6, and an axial misalignment correction mechanism 7. The radial misalignment correction mechanism 6 and the axial misalignment correction mechanism 7 of the longitudinal joint are both mounted on the base 3. Each correction mechanism is hydraulically controlled to achieve precise control of the correction process. The specific structure is described below: I. Base: The base 3 is welded from channel steel. The bottom of the base 3 is equipped with locking rollers (not shown in the figure) to ensure that the entire device can be easily moved to the side of the longitudinal seam 8 of the cylinder section 1 that needs to be corrected. Two vertical lifting hydraulic cylinders 4 are installed on the base 3 (more can be set as needed, not listed one by one). The hydraulic cylinders are connected and fixed to the plate with upper flanges. Crossbeams 5 are installed on the piston rods of the two vertical lifting hydraulic cylinders 4. The crossbeams 5 are equipped with the radial misalignment correction mechanism 6 and the axial misalignment correction mechanism 7 of the longitudinal seam 8. In order to adapt to the needs of large-diameter rotary kiln cylinder sections, the two hydraulic cylinders on the base 3 can be replaced with multi-stage telescopic hydraulic cylinders.

[0028] II. Longitudinal seam radial misalignment correction mechanism 6: The longitudinal joint radial misalignment correction mechanism 6 includes a crossbeam 5, a radial adjustment hydraulic cylinder 6-1, a pin 6-2, a radial correction connecting rod 6-3, and a U-shaped clamp 6-4. The crossbeam 5 is mounted on two vertical lifting hydraulic cylinders 4. The vertical lifting hydraulic cylinders 4 control the entire radial misalignment correction mechanism 6 and the axial misalignment correction mechanism 7 to move up and down with the crossbeam 5. The adjustment is made according to the diameter of the cylinder section 1 so that the radial misalignment correction mechanism 6 and the axial misalignment correction mechanism 7 can reach the position of the longitudinal joint 8 to adapt to the longitudinal joint correction of cylinder sections 1 with different diameters. The radial adjusting hydraulic cylinder 6-1 is mounted on the crossbeam 5. The piston rod extends and retracts radially along the cylinder section 1. The end of the piston rod is connected to the radial correction connecting rod 6-3 via a pin 6-2. U-shaped clips 6-4 are installed at both ends of the radial correction connecting rod 6-3, with a clearance fit between the ends of the radial correction connecting rod 6-3 and the U-shaped clips 6-4 for easy disassembly and assembly. The U-shaped clips are engaged on the inner and outer walls of the cylinder section 1, enabling radial push-pull correction and alignment of the upper and lower edges of the longitudinal seam 8. When the piston rod of the radial adjusting hydraulic cylinder 6-1 extends outward, the lower half of the radial correction connecting rod 6-3 pushes inward through the U-shaped clips 6-4, and the upper half pulls outward through the U-shaped clips 6-4, acting as a lever to align the upper and lower edges of the longitudinal seam 8. When the piston rod of the radial adjusting hydraulic cylinder 6-1 retracts, the upper half of the radial correction connecting rod 6-3 pushes inward through the U-shaped clips 6-4, and the lower half pulls outward through the U-shaped clips 6-4, creating a lever effect to align the upper and lower edges of the longitudinal seam 8. Pull the clip 6-4 outwards to align the upper and lower sides of the longitudinal seam 8; There are two sets of longitudinal seam radial misalignment correction mechanisms 6, which are respectively arranged at both ends of the cylinder section 1. By extending and retracting the radial adjustment hydraulic cylinders 6-1 at both ends, the radial misalignment of the longitudinal seam 8 can be accurately corrected. At the same time, the spacing between the two cylinders on the U-shaped clip 6-4 can be made into several specifications to meet the longitudinal seam radial correction requirements of cylinder sections 1 with different thicknesses. The radial adjustment hydraulic cylinder 6-1 adopts high-precision hydraulic control, which can achieve stepless adjustment and improve the correction accuracy.

[0029] III. Axial Misalignment Correction Mechanism 7: The longitudinal seam axial misalignment correction mechanism 7 consists of a crossbeam 5, an axial adjustment hydraulic cylinder 7-1, a second pin 7-2, and an axial correction connecting rod 7-3. The axial adjustment hydraulic cylinder 7-1 is also installed at one end of the crossbeam 5 via a flange. The piston rod of the axial adjustment hydraulic cylinder 7-1 is arranged axially along the cylinder section 1. The piston of the axial adjustment hydraulic cylinder 7-1 is hinged to the axial correction connecting rod 7-3 via the second pin 7-2. When the piston of the axial adjustment hydraulic cylinder 7-1 extends, the piston of the axial adjustment hydraulic cylinder 7-1 presses against the end face of the cylinder section 1 at the axial misalignment point on the end face of the cylinder section 1 via the axial correction connecting rod 7-3, pushing the protruding edge in the other direction and pressing it against the vertical end face of the other end of the crossbeam 5, ensuring that the two sides of the longitudinal seam 8 are accurately aligned along the axial misalignment.

[0030] A method for correcting misalignment of longitudinal seams in large energy-saving rotary kiln sections includes the following steps: Step 1: Adjust the position of section 1. Use plate rolling machine 2 to adjust the longitudinal seam 8 of section 1 to a horizontal position for easy operation; Step 2: Adjusting the relative position of the entire longitudinal seam misalignment correction device with that of the rotary kiln section 1. Move the entire longitudinal seam misalignment correction device to a suitable position next to the longitudinal seam 8. By activating the vertical lifting hydraulic cylinder 4, raise the center of the crossbeam 5 to a position flush with the longitudinal seam 8. Then push the base 3 closer to the outer circle of section 1, and insert the U-shaped clips into the holes at both ends of the radial misalignment correction connecting rod 6-3. At this point, the adjustment of the relative position between the longitudinal seam misalignment correction device of section 1 and the rotary kiln section 1 is completed. Lock the rollers under the base (not shown in the figure). Step 3: Preset the width of the longitudinal seam 8. When the gap at one end of the cylinder section 1 is smaller than the gap at the other end of the cylinder section 1, the overhead crane on the cylinder section 1 clamps the upper edge of the end with the smaller gap of the longitudinal seam 8 and gently lifts it upwards to make the gaps of the longitudinal seams 8 at both ends of the cylinder section 1 the same. Due to the error in the actual cutting of the longitudinal seam 8, the measurement of the gap 8 is inaccurate. Therefore, when actually checking the size of the welded longitudinal seam 8, it is usually checked by the straight lines drawn on the upper and lower sides of the longitudinal seam 8 on the wall of the cylinder section 1 to ensure that the two straight lines are parallel and the spacing meets the process requirements, thereby realizing the adjustment of the width of the longitudinal seam 8. Step 4: Longitudinal joint 8 radial misalignment correction. Activate the longitudinal joint radial misalignment correction mechanism 6. The radial misalignment amount of the longitudinal joint is detected in real time through the radial misalignment measurement template. Based on the detection data, adjust the extension and retraction of the radial adjustment hydraulic cylinders 6-1 at both ends, driving the radial correction connecting rod 6-3 and U-shaped clamp 6-4 to radially press and adjust the edges of the cylinder sections 1 on both sides of the longitudinal joint 8 until the radial misalignment amount of the longitudinal joint 8 is controlled within the design tolerance range. During the correction process, observe the radial misalignment data on the template in real time to avoid over-correction or under-correction. Step 5: Correction of longitudinal seam axial misalignment. Activate the longitudinal seam axial misalignment correction mechanism 7. By adjusting the extension and retraction of the axial adjustment hydraulic cylinder 7-1 at one end of the cylinder section 7, the axial correction pressure plate 7-3 is driven to axially push and adjust the edges of the cylinder sections 1 on both sides of the longitudinal seam 8. During the correction process, when the edges of the cylinder sections on both sides of the longitudinal seam 8 are aligned, until the axial misalignment of the longitudinal seam 8 meets the design requirements, stop the axial adjustment hydraulic cylinder 7-1 to ensure correction accuracy. Step 6: Verification and fine-tuning of the longitudinal seam 8 gap width. After the radial and axial misalignment of the longitudinal seam 8 is corrected, the gap width of the longitudinal seam 8 is verified by checking the gap width. If there is an uneven width at both ends of the cylinder section 1, the traveling crane on the cylinder section 1 is adjusted until the gap width of the longitudinal seam 8 is uniform and consistent throughout the entire length and meets the design requirements. Step 7: Fixing and Subsequent Processes. After the correction is completed, the position of the longitudinal seam 8 of the cylinder section 1 is fixed by temporary spot welding or segment welding to prevent misalignment or changes in seam width during subsequent movement; loosen the correction mechanisms, remove the corrected cylinder section 1 from the rolling machine, and transfer it to the welding process to complete the subsequent welding operations.

[0031] Advantages of this project: 1. Simultaneous correction of radial and axial misalignment of longitudinal seams, significantly improving correction efficiency and accuracy: This device integrates the radial and axial misalignment correction mechanisms for longitudinal seams, enabling simultaneous correction and alignment of radial and axial misalignment, greatly shortening correction time and reducing manual labor intensity. Combined with detection, it achieves real-time detection and precise control of radial and axial misalignment, with a correction accuracy of ±0.3mm, ensuring that the misalignment is controlled within the design tolerance range. This effectively solves the problems of poor accuracy and low efficiency in existing technologies, avoiding welding defects and cylinder deformation caused by excessive misalignment, and reducing welding stress concentration problems from the root.

[0032] 2. Uniform and controllable longitudinal seam gap width, ensuring welding quality: Through the longitudinal seam gap width adjustment method, no extra adjustment mechanism is needed to achieve precise preset and real-time control of the longitudinal seam gap width, ensuring that the gap width is uniform throughout the entire length of the longitudinal seam, effectively avoiding defects such as incomplete melting and slag inclusion during welding, improving welding strength and sealing performance, reducing subsequent rework workload, and meeting the gap standard requirements (2mm~4mm) for welding large rotary kiln cylinder sections.

[0033] 3. High versatility and adaptability to different diameter cylinder sections: The cylinder section base can move along the ground, and the corresponding specifications of the parts can be replaced according to the diameter and thickness of the cylinder section. There is no need to equip a complete set of correction devices for different specifications of cylinder sections, which reduces manufacturing costs and improves the applicability of the device. At the same time, the adjustment function of the radial and axial correction mechanism can further adapt to the correction needs of different specifications of cylinder sections, expanding the application range of the device.

[0034] 4. The cylinder section is fixed on the plate rolling machine without the need for other fixing devices; at the same time, the radial and axial correction mechanisms are evenly stressed and hydraulically controlled, allowing for easy adjustment of speed and pressure. The top-pressing and push-pull adjustment methods prevent cylinder section deformation caused by excessive local stress, ensuring that the roundness and straightness of the cylinder section meet the design requirements. This solves the problem of easy deformation of the cylinder section during the existing correction process, and also meets the specification requirement of "not removing temporary supports and avoiding deformation" during cylinder section assembly.

[0035] Example 2: This example is basically the same as Example 1, and the similarities will not be repeated. The difference is that there is only one vertical lifting hydraulic cylinder 4. At this time, a guide mechanism is provided between the crossbeam 5 and the base 3. There are two guide mechanisms, which are located on both sides of the vertical lifting hydraulic cylinder 4, to effectively prevent the crossbeam 5 from tilting when it is raised or lowered. The guide mechanism includes a guide column and a guide sleeve. The guide sleeve is set on the crossbeam 5. The lower end of the guide column is connected to the base 3, and the upper part of the guide column is inserted into the guide sleeve. The two are in a sliding fit and can slide to guide.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications made based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device, comprising a base, characterized in that: A vertical lifting hydraulic cylinder is provided at the upper end of the base. The upper end of the piston rod of the vertical lifting hydraulic cylinder is connected to the lower end of a crossbeam. An axial misalignment correction mechanism and a radial misalignment correction mechanism are respectively provided at the left and right ends of the crossbeam. The radial misalignment correction mechanism includes a radial adjustment hydraulic cylinder and a radial correction connecting rod. The radial adjustment hydraulic cylinder is mounted on the crossbeam, and its piston rod extends and retracts radially along the cylinder section. The outer end of the piston rod is hinged to the inner side of the radial correction connecting rod through a first pin. U-shaped clips are respectively installed at the upper and lower ends of the radial correction connecting rod. The U-shaped clips are respectively clipped on the inner and outer walls of the cylinder section to realize radial push-pull correction and alignment of the upper and lower edges of the longitudinal seam. The longitudinal seam axial misalignment correction mechanism includes an axial adjustment hydraulic cylinder and an axial correction connecting rod. The axial adjustment hydraulic cylinder is installed at the end of the crossbeam, and its piston rod extends and retracts along the axial direction of the cylinder section. The piston of the axial adjustment hydraulic cylinder is hinged to the inner side of the axial correction connecting rod through a second pin. The axial correction connecting rod presses against the end face of the cylinder section to achieve the correction and alignment of the longitudinal seam axial misalignment.

2. The large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device according to claim 1, characterized in that: The radial correction link has shaft holes at its upper and lower ends, and one side post of the U-shaped clip is inserted into the shaft hole with clearance fit, allowing for disassembly and assembly.

3. The large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device according to claim 1, characterized in that: The radial correction link is a V-shaped plate structure, with its middle corner hinged to the crossbeam via a third pin. The outer end of the piston rod of the radial adjustment hydraulic cylinder is hinged to one side plate of the radial correction link via a first pin. The radial correction link, the third pin, and the radial adjustment hydraulic cylinder together constitute a lever-type motion mechanism.

4. The large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device according to claim 3, characterized in that: A groove is provided in the middle of the plate at the middle corner of the radial correction link. The support plate on the crossbeam is located in the groove. The third pin is provided through the groove, the side wall and the support plate. Two ear plates are provided on one side plate of the radial correction link. The outer end of the piston rod of the radial adjustment hydraulic cylinder is located between the two ear plates. The second pin is provided through the ear plates and the piston rod.

5. The large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device according to claim 1, characterized in that: The axial correction link is an equilateral triangular plate structure with a groove in the middle of the plate at its apex. The outer end of the piston rod of the axial adjustment hydraulic cylinder is located in the groove. A second pin is provided through the side wall of the groove and the piston rod. Arc-shaped surfaces are provided at the two bottom corners of the axial correction link.

6. The large-scale energy-saving rotary kiln section longitudinal joint misalignment correction device according to claim 1, characterized in that: The base is welded from channel steel and has locking rollers at the bottom for easy movement to the side of the longitudinal seam of the cylinder section that needs to be corrected; the vertical lifting hydraulic cylinder is a single-stage telescopic hydraulic cylinder or a multi-stage telescopic hydraulic cylinder; there are two vertical lifting hydraulic cylinders arranged at intervals, or there is one vertical lifting hydraulic cylinder, in which case a guide mechanism is provided between the crossbeam and the base.

7. A method for correcting misalignment of longitudinal seams in a large energy-saving rotary kiln section using the misalignment correction device for longitudinal seams of a large energy-saving rotary kiln section as described in any one of claims 1-6, comprising the following steps: Step 1: Adjust the position of the cylinder section: Use a plate rolling machine to adjust the longitudinal seam of the cylinder section to a horizontal position to facilitate the operation of the next process; Step 2: Adjust the position of the entire longitudinal joint misalignment correction device: Move the entire longitudinal joint misalignment correction device to a suitable position next to the longitudinal joint, and raise the center of the crossbeam to a position flush with the longitudinal joint by activating the vertical lifting hydraulic cylinder. Step 3: Perform radial misalignment correction of the longitudinal joint: Start the radial misalignment correction mechanism of the longitudinal joint, and detect the radial misalignment of the longitudinal joint in real time through the radial misalignment measurement template. According to the detection data, adjust the extension and retraction of the radial adjustment hydraulic cylinders at both ends, and drive the radial correction connecting rod and U-shaped clamp to perform radial pressure adjustment on the edges of the cylinder sections on both sides of the longitudinal joint until the radial misalignment of the longitudinal joint is controlled within the design tolerance range. Step 4: Perform longitudinal joint axial misalignment correction: Start the longitudinal joint axial misalignment correction mechanism, and drive the axial correction pressure plate to axially push and adjust the edges of the cylinder on both sides of the longitudinal joint by adjusting the extension and retraction of the axial adjustment hydraulic cylinder at one end of the cylinder section until the longitudinal joint axial misalignment meets the design requirements. Then stop the axial adjustment hydraulic cylinder to ensure the correction accuracy. Step 5: Check and fine-tune the gap width of the longitudinal joint: After the radial and axial misalignment of the longitudinal joint is corrected, check the gap width of the longitudinal joint throughout its entire length by checking the gap width. If there is a situation where the widths at both ends of the cylinder are different, adjust the traveling crane on the cylinder until the gap width of the longitudinal joint is uniform and consistent throughout its entire length and meets the design requirements. Step 6: Fixing and subsequent processes: After the correction is completed, the longitudinal seam position of the cylinder section is fixed by temporary spot welding or segment welding to prevent misalignment or changes in seam width during subsequent movement; loosen the correction mechanisms, unload the corrected cylinder section from the rolling machine, and transfer it to the welding process to complete the subsequent welding operation.

8. The method for correcting misalignment of longitudinal seams in large energy-saving rotary kiln sections according to claim 7, characterized in that: Preset longitudinal seam width: When the gap at one end of the cylinder is smaller than the gap at the other end of the cylinder, the overhead crane on the cylinder clamps the upper edge of the end with the smaller gap in the longitudinal seam and gently lifts it upwards to make the gaps of the longitudinal seams at both ends of the cylinder the same.

9. The method for correcting misalignment of longitudinal seams in large energy-saving rotary kiln sections according to claim 8, characterized in that: Due to errors in the actual longitudinal seam cutting, the measured gap is inaccurate. When actually inspecting the longitudinal seam size of the weld, it is usually checked by drawing straight lines on the upper and lower sides of the longitudinal seam on the cylinder wall to ensure that the two straight lines are parallel and the spacing meets the process requirements, thereby adjusting the width of the longitudinal seam.

10. A method for correcting misalignment of longitudinal seams in large energy-saving rotary kiln sections according to claim 7, characterized in that: in In step 4, during the correction process, the radial misalignment data on the template is observed in real time to avoid over-correction or under-correction.

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